U.S. patent application number 15/127633 was filed with the patent office on 2017-06-01 for waste heat recovery system, gas turbine plant provided with same, waste heat recovery method, and installation method for waste heat recovery system.
The applicant listed for this patent is MITSUBISHI HITACHI POWER SYSTEMS, LTD.. Invention is credited to Yukimasa NAKAMOTO, Yuichi OKA, Hideaki SUGISHITA, Hideyuki UECHI.
Application Number | 20170152765 15/127633 |
Document ID | / |
Family ID | 54195307 |
Filed Date | 2017-06-01 |
United States Patent
Application |
20170152765 |
Kind Code |
A1 |
UECHI; Hideyuki ; et
al. |
June 1, 2017 |
WASTE HEAT RECOVERY SYSTEM, GAS TURBINE PLANT PROVIDED WITH SAME,
WASTE HEAT RECOVERY METHOD, AND INSTALLATION METHOD FOR WASTE HEAT
RECOVERY SYSTEM
Abstract
A gas turbine including: a compressor that compresses air; a
combustor that combusts fuel in the compressed air so as to
generate combustion gas; and a turbine that is driven using the
combustion gas. A plurality of cooling air coolers bleed the air
from a plurality of places having different pressures in the
compressor and cool the air bled from the respective places,
thereby generating cooling air is provided. A waste heat recovery
device that recovers waste heat from the at least two cooling air
coolers among the plurality of cooling air coolers is provided.
Inventors: |
UECHI; Hideyuki; (Tokyo,
JP) ; SUGISHITA; Hideaki; (Tokyo, JP) ;
NAKAMOTO; Yukimasa; (Yokohama-shi, JP) ; OKA;
Yuichi; (Yokohama-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
MITSUBISHI HITACHI POWER SYSTEMS, LTD. |
Kanagawa |
|
JP |
|
|
Family ID: |
54195307 |
Appl. No.: |
15/127633 |
Filed: |
March 19, 2015 |
PCT Filed: |
March 19, 2015 |
PCT NO: |
PCT/JP2015/058271 |
371 Date: |
September 20, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F02C 9/18 20130101; F05D
2220/72 20130101; Y02E 20/14 20130101; F02C 7/185 20130101; F01K
25/10 20130101; F01K 23/10 20130101; F05D 2220/62 20130101; F01K
5/02 20130101 |
International
Class: |
F01K 23/10 20060101
F01K023/10; F02C 9/18 20060101 F02C009/18; F02C 7/18 20060101
F02C007/18 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 24, 2014 |
JP |
2014-060606 |
Claims
1. A waste heat recovery system comprising: a plurality of cooling
air coolers that, in a gas turbine including a compressor that
compresses air, a combustor that combusts fuel in the compressed
air so as to generate combustion gas, and a turbine that is driven
using the combustion gas, bleed the air from a plurality of places
having different pressures in the compressor and cool the air bled
from the respective places, thereby generating cooling air; and a
waste heat recovery device that recovers waste heat from the at
least two cooling air coolers among the plurality of cooling air
coolers, wherein the waste heat recovery device recovers waste heat
from higher air pressure parts of at least two cooling air coolers
to a higher temperature heating medium as high-temperature waste
heat, and recovers waste heat from lower air pressure parts of the
at least two cooling air coolers to a lower temperature heating
medium as low-temperature waste heat.
2. (canceled)
3. A waste heat recovery system comprising: a plurality of cooling
air coolers that, in a gas turbine including a compressor that
compresses air, a combustor that combusts fuel in the compressed
air so as to generate combustion gas, and a turbine that is driven
using the combustion gas, bleed the air from a plurality of places
having different pressures in the compressor and cool the air bled
from the respective places, thereby generating cooling air; and a
waste heat recovery device that recovers waste heat from the at
least two cooling air coolers among the plurality of cooling air
coolers, wherein the waste heat recovery device comprises a waste
heat recovery boiler that heats water using exhaust gas from the
turbine, recovers waste heat from higher air pressure parts of the
at least two cooling air coolers to a portion of the waste recovery
boiler with a higher water temperature as high-temperature waste
heat, and recovers waste heat from lower air pressure parts of the
at least two cooling air coolers to a portion of the waste heat
recovery broiler with a lower water temperature as low-temperature
waste heat.
4. The waste heat recovery system according to claim 1, wherein the
waste heat recovery device comprises a waste heat recovery boiler
that heats water using exhaust gas from the turbine, recovers waste
heat from higher air pressure parts of the at least two cooling air
coolers to a portion of the waste recovery boiler with a higher
water pressure as high-temperature waste heat, and recovers waste
heat from lower air pressure parts of the at least two cooling air
coolers to a portion of the waste recovery boiler with a lower
water pressure as low-temperature waste heat.
5. (canceled)
6. The waste heat recovery system according to claim 1, wherein the
waste heat recovery device comprises a plurality of
low-boiling-point medium Rankine cycles in which low-boiling-point
media each having a different boiling point repeat a cycle
consisting of condensation, evaporation and circulation due to the
recovered waste heat, recovers waste heat from higher air pressure
parts of the at least two cooling air coolers as high-temperature
waste heat in the low-boiling-point medium Rankine cycle in which
the low-boiling-point medium has a higher boiling point, and
recovers waste heat from lower air pressure parts of the at least
two cooling air coolers as low-temperature waste heat in the
low-boiling-point medium Rankine cycle in which the
low-boiling-point medium has a lower boiling point.
7. The waste heat recovery system according to claim 1, wherein the
waste heat recovery device comprises one low-boiling-point medium
Rankine cycle in which a low-boiling-point media repeats a cycle
consisting of condensation, evaporation, and circulation due to the
recovered waste heat, the low-boiling-point medium Rankine cycle:
recovers waste heat from higher air pressure parts of the at least
two cooling air coolers to a location in which the low-boiling
point media has a higher temperature as high-temperature waste
heat, and recovers waste heat from lower air pressure parts of the
at least two cooling air coolers to a location in which the
low-boiling point media has a lower pressure.
8. The waste heat recovery system according to claim 1, wherein the
waste heat recovery device comprises: a low-boiling-point medium
Rankine cycle in which low-boiling-point media each having a
different boiling point repeat a cycle consisting of condensation,
evaporation, and circulation, due to the recovered waste heat; and
a Rankine cycle including a waste heat recovery boiler that heats
water using exhaust gas from the turbine and a steam turbine that
is driven using the water heated in the waste heat recovery boiler
as an operating medium, recovers waste heat from higher air
pressure parts of the at least two cooling air coolers as
high-temperature waste heat in the Rankine cycle, and recovers
waste heat from lower pressure parts of the at least two cooling
air coolers as low-temperature waste heat in the low-boiling-point
medium Rankine cycle.
9. The waste heat recovery system according to claim 6, wherein,
the waste heat recovery device comprises the low-boiling point
medium Rankine cycle including an evaporator that evaporates
low-boiling-point media using waste heat from the cooling air
coolers by recovering the waste heat using heating media, a
recovery line enabling the heating media that have recovered the
waste heat in the cooling air coolers to flow toward the
evaporator, a returning line which communicates with the recovery
line and enables the heating media which have delivered the waste
heat to the evaporator to flow toward the cooling air coolers, and
a pump that circulates the heating media between the cooling air
coolers and the evaporator through the recovery line and the
returning line.
10. The waste heat recovery system according to claim 9, wherein
the waste heat recovery device comprises a bypass line which allows
the recovery line and the returning line to communicate without the
cooling air coolers and the evaporators being therebetween and thus
enables the heating media to flow therebetween and a flow
rate-adjusting valve that adjusts a flow rate of the heating media
which flow through the bypass line.
11. The waste heat recovery system according to claim 10, wherein
the waste heat recovery device comprises a control device that
adjusts the flow rate-adjusting valve so that a temperature of the
cooling air which is generated in the cooling air coolers becomes
constant.
12. The waste heat recovery system according to claim 9, wherein
the waste heat recovery device comprises a waste heat recovery
boiler that heats water using exhaust gas from the turbine and uses
the water in the waste heat recovery boiler as the heating
medium.
13. The waste heat recovery system according to claim 3, wherein
the waste heat recovery device produces mixed wasted heat by mixing
waste heat from part or all of the at least two cooling air
coolers, recovers waste heat having a higher temperature among the
mixed waste heat and waste heat which is not mixed with the mixed
waste heat as high-temperature waste heat, and recovers waste heat
having a lower temperature among the mixed waste heat and waste
heat which is not mixed with the mixed waste heat as
low-temperature waste heat.
14. The waste heat recovery system according to claim 13, wherein
the waste heat recovery device generates the mixed waste heat by
causing heating media to flow in parallel through part or all of
the at least two cooling air coolers.
15. The waste heat recovery system according to claim 13, wherein
part or all of the at least two cooling air coolers capable of
recovering waste heat having a higher temperature is
high-temperature side cooling air cooler, part or all of the at
least two cooling air coolers, the cooling air cooler capable of
recovering waste heat having a lower temperature is low-temperature
side cooling air cooler, and the waste heat recovery device causes
heating media to flow in series from the low-temperature side
cooling air cooler to the high-temperature side cooling air cooler,
thereby generating mixed waste heat.
16. The waste heat recovery system according to claim 13, wherein
the waste heat recovery device generates the mixed waste heat by
causing heating media to flow in parallel through part or all of
the at least two cooling air coolers and generates mixed waste heat
by flowing the heating media through a parallel cooling air cooler
group including part or all of the at least two cooling air coolers
through which the heating media flow in parallel and flowing in
series the heating media through the parallel cooling air cooler
group and the cooling air cooler not in the parallel cooling air
cooler group.
17. A gas turbine plant comprising: the waste heat recovery system
according to claim 1; and the gas turbine including the compressor
that compresses air, the combustor that generates combustion gas by
combusting fuel in the compressed air, and the turbine that is
driven using the combustion gas.
18. A waste heat recovery method comprising: a bleeding step of
bleeding air from a plurality of places having different pressures
in a compressor in a gas turbine including the compressor that
compresses air, a combustor that generates combustion gas by
combusting fuel in the compressed air, and a turbine that is driven
using the combustion gas; a cooling step of cooling the air bled
respectively from the plurality of places, thereby generating
cooling air that cools high-temperature components; and a waste
heat recovery step of recovering waste heat generated when cooling
air generated in at least two of the plurality of places
corresponding to plurality of bleeding places, wherein, in the
waste heat recovery step, waste heat obtained by cooling the air
bled from a higher pressure place of the at least two places is
recovered to a higher temperature heating medium as
high-temperature waste heat, and waste heat obtained by cooling the
air bled from a lower pressure place of the at least two places is
recovered to a lower temperature heating medium as low-temperature
waste heat.
19-21. (canceled)
22. The waste heat recovery method according to claim 18, wherein,
in the waste heat recovery step, the waste heat is recovered in a
plurality of low-boiling-point medium Rankine cycles in which
low-boiling-point media having different boiling points
respectively repeat a cycle consisting of condensation, evaporation
and circulation, waste heat obtained by cooling the air bled from a
higher pressure place of the at least two places is recovered as
high-temperature waste heat in the low-boiling-point medium Rankine
cycle in which the low-boiling-point medium has a higher boiling
point, and waste heat obtained by cooling the air bled from a lower
pressure place of the at least two places is recovered as
low-temperature waste heat in the low-boiling-point medium Rankine
cycle in which the low-boiling-point medium has a lower boiling
point.
23. (canceled)
24. The waste heat recovery method according to claim 18, wherein,
in the waste heat recovery step, higher pressure waste heat
obtained by cooling the air bled from the at least two places is
recovered as high-temperature waste heat in a Rankine cycle
including a waste heat recovery boiler that heats water using
exhaust gas from the turbine and a steam turbine that is driven
using the water heated in the waste heat recovery boiler as an
operating medium, and lower pressure waste heat obtained by cooling
the air bled from the at least two places is recovered as
low-temperature waste heat in a low-boiling-point Rankine cycle in
which low-boiling-point media repeat a cycle consisting of
condensation, evaporation, and circulation.
25-26. (canceled)
27. The waste heat recovery method according to claim 18, wherein,
in the waste heat recovery step, mixed waste heat is produced by
mixing part or all of the waste heat obtained by cooling the air
bled from the at least two places, waste heat having a higher
temperature among the mixed waste heat and waste heat which are not
mixed with the mixed waste heat is recovered as high-temperature
waste heat, and waste heat having a lower temperature among the
mixed waste heat and waste heat which are not mixed with the mixed
waste heat is recovered as low-temperature waste heat.
28-30. (canceled)
31. An installation method for waste heat recovery systems, wherein
the waste heat recovery system according to claim 1 is installed in
the gas turbine.
Description
TECHNICAL FIELD
[0001] The present invention relates to a waste heat recovery
system that recovers waste heat when cooling air is generated, a
gas turbine plant provided with the same, a waste heat recovery
method, and an installation method for waste heat recovery
systems.
[0002] Priority is claimed on Japanese Patent Application No.
2014-060606, filed Mar. 24, 2014, the content of which is
incorporated herein by reference.
BACKGROUND ART
[0003] Gas turbines have a compressor that compresses air, a
combustor that generates combustion gas G by combusting fuel in the
air compressed using the compressor, and a turbine that is driven
using the combustion gas G. In these gas turbines, there are cases
in which high-temperature components such as turbine vanes are
cooled by supplying bleed air from compressor to the
high-temperature components.
[0004] Patent Document 1 described below discloses a constitution
in which intermediate-stage bleed air in compressor is cooled using
air coolers and then the cooled bleed air is supplied to turbine
vanes which are high-temperature components.
CITATION LIST
Patent Literature
[0005] [Patent Document 1] Japanese Unexamined Patent Application,
First Publication No. H7-54669
SUMMARY OF INVENTION
Technical Problem
[0006] However, in the technique described in Patent Document 1,
waste heat generated during the cooling of intermediate-stage bleed
air in air coolers is not used and is simply discharged outside,
and thus, currently, waste heat is not effectively used.
[0007] Therefore, the present invention provides a waste heat
recovery system, a gas turbine plant, a waste heat recovery method,
and an installation method for waste heat recovery systems which
enable the effective use of waste heat generated when cooling air
is generated from air bled from compressor and are capable of
increasing heat usage efficiency.
Solution to Problem
[0008] According to a first aspect of the present invention, a
waste heat recovery system includes: a plurality of cooling air
coolers that, in a gas turbine including a compressor that
compresses air, a combustor that combusts fuel in the compressed
air so as to generate combustion gas, and a turbine that is driven
using the combustion gas, bleed the air from a plurality of places
having different pressures in the compressor and cool the air bled
from the respective places, thereby generating cooling air; and a
waste heat recovery device that recovers waste heat from the at
least two cooling air coolers among the plurality of cooling air
coolers.
[0009] According to the above-described waste heat recovery system,
it is possible to generate cooling air which is used to cool, for
example, high-temperature components while reducing the power of
compressor by means of bleeding from the compressor. In addition,
bleeding is carried out in places in the compressor having
different pressures, and thus it is possible to generate cooling
air having different pressures and temperatures. Therefore, it is
possible to recover waste heat having different temperatures from
individual cooling air coolers using a waste heat recovery device,
and it becomes possible to use waste heat in accordance with the
temperatures thereof.
[0010] According to a second aspect of the present invention, in
the waste heat recovery system of the first aspect, the waste heat
recovery device may recover waste heat from higher air pressure
parts of at least two cooling air coolers to a higher temperature
heating medium as high-temperature waste heat, and may recover
waste heat from lower air pressure parts of the at least two
cooling air coolers to a lower temperature heating medium as
low-temperature waste heat.
[0011] As described above, waste heat from the cooling cooler in
which the air has higher air pressure becomes the higher
temperature waste heat having a higher temperature, and waste heat
from the cooling cooler in which the air has lower air pressure
becomes the lower temperature waste heat having a lower
temperature. In addition, waste heat from each of the cooling air
coolers is individually recovered in accordance with the
temperature of the heating media, whereby effective use of waste
heat becomes possible.
[0012] According to a third aspect of the present invention, in the
waste heat recovery system of the first aspect, the waste heat
recovery device may include a waste heat recovery boiler that heats
water using exhaust gas from the turbine, may recover waste heat
from higher air pressure parts of the at least two cooling air
coolers to a portion of the waste recovery boiler with a higher
water temperature as high-temperature waste heat, and may recover
waste heat from lower air pressure parts of the at least two
cooling air coolers to a portion of the waste heat recovery broiler
with a lower water temperature as low-temperature waste heat.
[0013] As described above, waste heat from the cooling air cooler
in which the air has a higher pressure becomes the higher
temperature waste heat having a higher temperature, and waste heat
from the cooling air cooler in which the air has a lower pressure
becomes the lower temperature waste heat having a lower temperature
In addition, the waste heat recovery boiler is provided, and waste
heat from each of the cooling air coolers is individually recovered
in accordance with the temperatures of water in the waste heat
recovery boiler, whereby effective use of waste heat becomes
possible.
[0014] According to a fourth aspect of the present invention, in
the waste heat recovery system of the first aspect, the waste heat
recovery device may include a waste heat recovery boiler that heats
water using exhaust gas from the turbine, may recover waste heat
from higher air pressure parts of the at least two cooling air
coolers to a portion of the waste recovery boiler with a higher
water pressure as high-temperature waste heat, and may recover
waste heat from lower air pressure parts of the at least two
cooling air coolers to a portion of the waste recovery boiler with
a lower water pressure as low-temperature waste heat.
[0015] As described above, the waste heat recovery boiler is
provided, and waste heat from the respective cooling air coolers is
individually recovered in accordance with the pressures of water in
the waste heat recovery boiler, whereby effective use of waste heat
becomes possible.
[0016] According to a fifth aspect of the present invention, in the
waste heat recovery system of the third or fourth aspect, the waste
heat recovery device may further include, in addition to the waste
heat recovery boiler, a steam turbine that is driven using the
water heated in the waste heat recovery boiler as an operating
medium.
[0017] As described above, the waste heat recovery system includes
a Rankine cycle. In addition, waste heat from the cooling air
coolers are recovered to individual locations of the Rankine cycle
in accordance with the temperatures of the waste heat, whereby it
is possible to efficiently drive the Rankine cycle and obtain
rotative power from waste heat from the cooling air coolers.
Therefore, more effective use of waste heat becomes possible.
[0018] According to a sixth aspect of the present invention, in the
waste heat recovery system of the first aspect, the waste heat
recovery device may include a plurality of low-boiling-point medium
Rankine cycles in which low-boiling-point media each having a
different boiling point repeat a cycle consisting of condensation,
evaporation and circulation due to the recovered waste heat, may
recover waste heat from higher air pressure parts of the at least
two cooling air coolers as high-temperature waste heat in the
low-boiling-point medium Rankine cycle in which the
low-boiling-point medium has a higher boiling point, and may
recover waste heat from lower air pressure parts of the at least
two cooling air coolers as low-temperature waste heat in the
low-boiling-point medium Rankine cycle in which the
low-boiling-point medium has a lower boiling point.
[0019] It is possible to drive the respective low-boiling-point
medium Rankine cycles by carrying out heat exchange between waste
heat and low-boiling-point media having boiling points
corresponding to the temperatures of individual waste heats in
accordance with the temperatures of waste heat. Therefore, more
effective use of waste heat becomes possible.
[0020] According to a seventh aspect of the present invention, in
the waste heat recovery system of the first aspect, the waste heat
recovery device may include one low-boiling-point medium Rankine
cycle in which a low-boiling-point repeats a cycle consisting of
condensation, evaporation, and circulation due to the recovered
waste heat, the low-boiling-point medium Rankine cycle may recover
waste heat from higher air pressure parts of the at least two
cooling air coolers to a location in which the low-boiling point
media has a higher temperature as high-temperature waste heat and
may recover waste heat from lower air pressure parts of the at
least two cooling air coolers to a location in which the
low-boiling point media has a lower pressure.
[0021] It is possible to drive the respective low-boiling-point
medium Rankine cycles by carrying out heat exchange between waste
heat and low-boiling-point media at locations having temperatures
corresponding to the temperatures of individual waste heats in
accordance with the temperatures of the waste heat. Therefore, more
effective use of waste heat becomes possible.
[0022] According to an eighth aspect of the present invention, in
the waste heat recovery system of the first aspect, the waste heat
recovery device may include: a low-boiling-point medium Rankine
cycle in which low-boiling-point media each having a different
boiling point repeat a cycle consisting of condensation,
evaporation, and circulation, due to the recovered waste heat; and
a Rankine cycle including a waste heat recovery boiler that heats
water using exhaust gas from the turbine and a steam turbine that
is driven using the water heated in the waste heat recovery boiler
as an operating medium, may recover waste heat from higher air
pressure parts of the at least two cooling air coolers as
high-temperature waste heat in the Rankine cycle, and may recover
waste heat from lower pressure parts of the at least two cooling
air coolers as low-temperature waste heat in the low-boiling-point
medium Rankine cycle.
[0023] Waste heat is recovered in the Rankine cycle or the
low-boiling-point medium Rankine cycle depending on the temperature
of waste heat, and the Rankine cycle or the low-boiling-point
medium Rankine cycle is driven, whereby more effective use of waste
heat becomes possible.
[0024] According to a ninth aspect of the present invention, in the
waste heat recovery system of any one of the sixth to eighth
aspects, the waste heat recovery device may include the low-boiling
point medium Rankine cycle including an evaporator that evaporates
low-boiling-point media using waste heat from the cooling air
coolers by recovering the waste heat using heating media, a
recovery line enabling the heating media that have recovered the
waste heat in the cooling air coolers to flow toward the
evaporator, a returning line which communicates with the recovery
line and enables the heating media which have delivered the waste
heat to the evaporator to flow toward the cooling air coolers, and
a pump that circulates the heating media between the cooling air
coolers and the evaporator through the recovery line and the
returning line.
[0025] According to the above-described waste heat recovery system,
it is possible to obtain power from waste heat from cooling air
coolers using low-boiling-point medium Rankine cycles. Furthermore,
since waste heat is recovered using heating media, it is possible
to select various heating media having higher heat exchange
efficiency in accordance with the temperature and the like of waste
heat. In addition, liquid-form heating media are used, whereby it
also becomes possible to reduce the sizes of devices such as heat
exchangers that exchange the heat of waste heat between the cooling
air coolers or the evaporator and the heating media. In addition,
heat is exchanged using heating media, whereby the control of heat
exchange becomes easy, and it is possible to more effectively use
waste heat.
[0026] According to a tenth aspect of the present invention, there
is provided the waste heat recovery system of the ninth aspect, in
which the waste heat recovery device may include a bypass line
which allows the recovery line and the returning line to
communicate without the cooling air coolers and the evaporators
being therebetween and thus enables the heating media to flow
therebetween and a flow rate-adjusting valve that adjusts a flow
rate of the heating media which flow through the bypass line.
[0027] The bypass line is provided, and the flow rate of heating
media which flow through the bypass line is adjusted using the flow
rate-adjusting valve, whereby it is possible to adjust the flow
rate of heating media which flow toward the cooling air coolers and
the evaporator, and it becomes possible to change the recovery
amount of waste heat. As a result, it becomes possible to adjust
the temperature of cooling air which is generated in the cooling
air coolers.
[0028] According to an eleventh aspect of the present invention, in
the waste heat recovery system of the tenth aspect, the waste heat
recovery device may include a control device that adjusts the flow
rate-adjusting valve so that a temperature of the cooling air which
is generated in the cooling air coolers becomes constant.
[0029] Since it is possible to set the temperature of cooling air
to be constant by adjusting the recovery amount of waste heat, it
becomes possible to maintain the temperature of cooling air in an
optimal state and improve the cooling effect on high-temperature
components. In addition, it is possible to prevent the temperatures
of high-temperature components from being excessively decreased and
limit a decrease in the operation efficiency of the system.
[0030] According to a twelfth aspect of the present invention, the
waste heat recovery system of the ninth to eleventh aspects, in
which the waste heat recovery device may include a waste heat
recovery boiler that heats water using exhaust gas from the turbine
and may use the water in the waste heat recovery boiler as the
heating medium.
[0031] Waste heat from the cooling air coolers is recovered using
water in the waste heat recovery boiler as a heating medium,
whereby it becomes possible to reduce costs by sharing facilities.
That is, it is possible to make the waste heat recovery system
function as a part of a cogeneration system or a combined
cycle.
[0032] According to a thirteenth aspect of the present invention,
in the waste heat recovery system of any one of the second to
twelfth aspects, the waste heat recovery device may produce mixed
wasted heat by mixing waste heat from part or all of the at least
two cooling air coolers, may recover waste heat having a higher
temperature among the mixed waste heat and waste heat which is not
mixed with the mixed waste heat as high-temperature waste heat, and
may recover waste heat having a lower temperature among the mixed
waste heat and waste heat which is not mixed with the mixed waste
heat as low-temperature waste heat.
[0033] Waste heat from part or all of the cooling air coolers are
mixed together and recovered, whereby waste heat temperatures can
be adjusted, and convenience in the use of waste heat further
improves. In addition, the recovery of waste heat becomes easy, and
the waste heat recovery device can be simplified compared with a
case in which waste heat are not mixed together and are
individually recovered.
[0034] According to a fourteenth aspect of the present invention,
in the waste heat recovery system of the thirteenth aspect, in
which the waste heat recovery device may generate the mixed waste
heat by causing heating media to flow in parallel through part or
all of the at least two cooling air coolers.
[0035] In a case in which the temperature difference between waste
heat recovered using the cooling air coolers is small, it is
possible to simplify the structures of waste heat recovery systems
while maintaining the recovery efficiency of waste heat by mixing
the waste heat together.
[0036] According to a fifteenth aspect of the present invention, in
the waste heat recovery system of the thirteenth aspect, part or
all of the at least two cooling air coolers capable of recovering
waste heat having a higher temperature may be high-temperature side
cooling air cooler, part or all of the at least two cooling air
coolers, the cooling air cooler capable of recovering waste heat
having a lower temperature may be low-temperature side cooling air
cooler, and the waste heat recovery device may cause heating media
to flow in series from the low-temperature side cooling air cooler
to the high-temperature side cooling air cooler, thereby generating
mixed waste heat.
[0037] Waste heat is recovered in series in an incremental order of
temperature of the waste heat, whereby it is possible to improve
the recovery efficiency of waste heat.
[0038] According to a sixteenth aspect of the present invention, in
the waste heat recovery system of the thirteenth aspect, the waste
heat recovery device may generate the mixed waste heat by causing
heating media to flow in parallel through part or all of the at
least two cooling air coolers and generates mixed waste heat by
flowing the heating media through a parallel cooling air cooler
group including part or all of the at least two cooling air coolers
through which the heating media flow in parallel and flowing in
series the heating media through the parallel cooling air cooler
group and the cooling air cooler not in the parallel cooling air
cooler group.
[0039] The heating media are caused to flow both in parallel and in
series, whereby it is possible to improve the recovery efficiency
of waste heat regardless of the degree of the temperature
difference between cooling air coolers.
[0040] According to a seventeenth aspect of the present invention,
a gas turbine plant includes: the waste heat recovery system
according to any one of the first to sixteenth aspects; and the gas
turbine including the compressor that compresses air, the combustor
that generates combustion gas by combusting fuel in the compressed
air, and the turbine that is driven using the combustion gas.
[0041] According to the above-described gas turbine plant, a waste
heat recovery system is provided, whereby it is possible to
generate cooling air while reducing the power of the compressor by
means of bleeding in the compressor. In addition, bleeding is
carried out in places having different pressures in the compressor,
and thus it is possible to generate cooling air having different
pressures and temperatures. Therefore, it is possible to recover
waste heat having different temperatures from individual cooling
air coolers using the waste heat recovery device, and it becomes
possible to use waste heat in accordance with the temperatures
thereof.
[0042] According to an eighteenth aspect of the present invention,
a waste heat recovery method includes: a bleeding step of bleeding
air from a plurality of places having different pressures in a
compressor in a gas turbine including the compressor that
compresses air, a combustor that generates combustion gas by
combusting fuel in the compressed air, and a turbine that is driven
using the combustion gas; a cooling step of cooling the air bled
respectively from the plurality of places, thereby generating
cooling air that cools high-temperature components; and a waste
heat recovery step of recovering waste heat generated when cooling
air generated in at least two of the plurality of places
corresponding to plurality of bleeding places.
[0043] According to the above-described waste heat recovery method,
bleeding is carried out in places having different pressures in
compressor, and thus it is possible to generate cooling air having
different pressures and temperatures. In addition, it becomes
possible to recover waste heat having different temperatures from
individual cooling air coolers, and it becomes possible to use
waste heat in accordance with the temperatures thereof.
[0044] According to a nineteenth aspect of the present invention,
in the waste heat recovery method of the eighteenth aspect, in the
waste heat recovery step, waste heat obtained by cooling the air
bled from a higher pressure place of the at least two places may be
recovered to a higher temperature heating medium as
high-temperature waste heat, and waste heat obtained by cooling the
air bled from a lower pressure place of the at least two places may
be recovered to a lower temperature heating medium as
low-temperature waste heat.
[0045] Waste heat from the respective cooling air coolers are
individually recovered in accordance with the temperatures of
heating media, whereby the effective use of waste heat becomes
possible.
[0046] According to a twentieth aspect of the present invention, in
the waste heat recovery method of the eighteenth aspect, in the
waste heat recovery step, waste heat obtained by cooling the air
bled from a higher pressure place of the at least two places may be
recovered to a portion with a higher water temperature of a waste
heat recovery boiler that heats water using exhaust gas from the
turbine as high-temperature waste heat, and waste heat obtained by
cooling the air bled from a lower pressure place of the at least
two places may be recovered to a portion with a lower water
temperature of the waste heat recovery boiler as low-temperature
waste heat.
[0047] Waste heat from the each of cooling air coolers is
individually recovered in accordance with the temperatures of water
in the waste heat recovery boiler, whereby effective use of waste
heat becomes possible.
[0048] According to a twenty-first aspect of the present invention,
in the waste heat recovery method of the eighteenth aspect, in the
waste heat recovery step, waste heat obtained by cooling the air
bled from a higher pressure place of the at least two places may be
recovered to a portion with a higher water pressure of the waste
heat recovery boiler as high-temperature waste heat, and waste heat
obtained by cooling the air bled from a lower pressure place of the
at least two places may be recovered to a portion with a lower
water pressure of the waste heat recovery boiler as low-temperature
waste heat.
[0049] Waste heat from the each of the cooling air coolers is
individually recovered in accordance with the pressures of water in
the waste heat recovery boiler, whereby the effective use of waste
heat becomes possible.
[0050] According to a twenty-second aspect of the present
invention, in the waste heat recovery method of the eighteenth
aspect, in the waste heat recovery step, the waste heat may be
recovered in a plurality of low-boiling-point medium Rankine cycles
in which low-boiling-point media having different boiling points
respectively repeat a cycle consisting of condensation, evaporation
and circulation, waste heat obtained by cooling the air bled from a
higher pressure place of the at least two places may be recovered
as high-temperature waste heat in the low-boiling-point medium
Rankine cycle in which the low-boiling-point medium has a higher
boiling point, and waste heat obtained by cooling the air bled from
a lower pressure place of the at least two places may be recovered
as low-temperature waste heat in the low-boiling-point medium
Rankine cycle in which the low-boiling-point medium has a lower
boiling point.
[0051] The respective low-boiling-point medium Rankine cycles are
driven by carrying out heat exchange between waste heat and
low-boiling-point media having boiling points corresponding to the
temperatures of individual waste heats in accordance with the
temperature of waste heat, whereby more effective use of waste heat
becomes possible.
[0052] According to a twenty-third aspect of the present invention,
in the waste heat recovery method of the eighteenth aspect, in the
waste heat recovery step, the waste heat may be recovered in one
low-boiling-point medium Rankine cycle in which low-boiling-point
media each having different boiling points repeat a cycle
consisting of condensation, evaporation, and circulation, waste
heat obtained by cooling the air bled from a higher pressure place
of the at least two places may be recovered to a location in which
the low-boiling-point media have a higher temperature in the
low-boiling-point medium Rankine cycle as high-temperature waste
heat, and waste heat obtained by cooling the air bled from a lower
pressure place of the at least two places may be recovered to a
location in which the low-boiling-point media have a lower
temperature in the low-boiling-point medium Rankine cycle as
low-temperature waste heat.
[0053] Heat is exchanged between waste heat and the
low-boiling-point media at locations having temperatures
corresponding to the temperatures of the waste heat, whereby it is
possible to further improve the use efficiency of waste heat.
[0054] According to a twenty-fourth aspect of the present
invention, in the waste heat recovery method of the eighteenth
aspect, in the waste heat recovery step, higher pressure waste heat
obtained by cooling the air bled from the at least two places may
be recovered as high-temperature waste heat in a Rankine cycle
including a waste heat recovery boiler that heats water using
exhaust gas from the turbine and a steam turbine that is driven
using the water heated in the waste heat recovery boiler as an
operating medium, and lower pressure waste heat obtained by cooling
the air bled from the at least two places may be recovered as
low-temperature waste heat in a low-boiling-point Rankine cycle in
which low-boiling-point media repeat a cycle consisting of
condensation, evaporation, and circulation.
[0055] Waste heat is recovered in the Rankine cycle or the
low-boiling-point medium Rankine cycle depending on the temperature
of waste heat, and the Rankine cycle or the low-boiling-point
medium Rankine cycle is driven, whereby more effective use of waste
heat becomes possible.
[0056] According to a twenty-fifth aspect of the present invention,
in the waste heat recovery method of any one of the twenty-second
to twenty-fourth aspects, in the waste heat recovery step, the
waste heat may be recovered in the low-boiling-point medium Rankine
cycle using a heating medium different from the low-boiling-point
media.
[0057] According to the above-described waste heat recovery method,
it is possible to select heating media having a higher heat
exchange efficiency in a various manner in accordance with the
temperature and the like of waste heat. In addition, heat is
exchanged using heating media, whereby the control of heat exchange
becomes easy, and it is possible to more effectively use heat
air.
[0058] According to a twenty-sixth aspect of the present invention,
in the waste heat recovery method of the twenty-fifth aspect, in
the waste heat recovery step, a recovery amount of the waste heat
may be adjusted by adjusting a flow rate of the heating media so
that a temperature of the cooling air is constant.
[0059] According to the above-described waste heat recovery method,
since it is possible to set the temperature of cooling air to be
constant by adjusting the recovery amount of waste heat, it becomes
possible to maintain the temperature of cooling air in an optimal
state and improve the cooling effect on high-temperature
components. In addition, it is possible to prevent the temperatures
of high-temperature components from being excessively
decreased.
[0060] According to a twenty-seventh aspect of the present
invention, in the waste heat recovery method of any one of the
eighteenth to twenty-sixth aspects, in the waste heat recovery
step, mixed waste heat may be produced by mixing part or all of the
waste heat obtained by cooling the air bled from the at least two
places, waste heat having a higher temperature among the mixed
waste heat and waste heat which are not mixed with the mixed waste
heat may be recovered as high-temperature waste heat, and waste
heat having a lower temperature among the mixed waste heat and
waste heat which are not mixed with the mixed waste heat may be
recovered as low-temperature waste heat.
[0061] Waste heat from part or all of the cooling air coolers are
mixed together and recovered, whereby waste heat temperatures can
be adjusted, and convenience in the use of waste heat further
improves. In addition, the recovery of waste heat becomes easy.
[0062] According to a twenty-eighth aspect of the present
invention, in the waste heat recovery method of the twenty-seventh
aspect, in the waste heat recovery step, part or all of the waste
heat obtained by cooling the air bled from the at least two places
may be recovered in parallel, and the mixed waste heat may be
generated.
[0063] In a case in which the temperature difference between waste
heat obtained by cooling the air from the respective bleeding
places is small, it is possible to simplify devices necessary for
the waste heat recovery step while maintaining the recovery
efficiency of waste heat by mixing the waste heat together.
[0064] According to a twenty-ninth aspect of the present invention,
there is provided the waste heat recovery method of the
twenty-seventh aspect, in which, in the waste heat recovery step,
part or all of the waste heat obtained by cooling the air bled in
the at least two places may be recovered in series from waste heat
having a lower temperature to waste heat having a higher
temperature in order, and the mixed waste heat may be
generated.
[0065] Waste heat is recovered in series in an incremental order of
temperature, whereby it is possible to improve the recovery
efficiency of waste heat.
[0066] According to a thirtieth aspect of the present invention, in
the waste heat recovery method of the twenty-seventh aspect, in the
waste heat recovery step, when part or all of the waste heat
obtained by cooling the air bled from the at least two places is
recovered in parallel, and the waste heat recovered in parallel are
considered to be a parallel waste heat group, the parallel waste
heat group and waste heat other than the parallel waste heat group
may be recovered in series, and the mixed waste heat may be
generated.
[0067] Waste heat is jointly recovered in parallel and in series,
whereby it is possible to improve the recovery efficiency of waste
heat regardless of the degree of the temperature difference between
waste heat obtained by cooling air from individual bleeding
places.
[0068] According to a thirty first aspect of the present invention,
in an installation method for waste heat recovery systems, the
waste heat recovery system according to any one of the first to
sixteenth aspects is installed in the gas turbine.
[0069] The waste heat recovery system is installed additionally in
the gas turbine as described above, whereby it is possible to
effectively use waste heat from cooling air coolers that have not
been used in existing gas turbine plants.
Advantageous Effects of Invention
[0070] According to the above-described waste heat recovery system,
gas turbine plant, waste heat recovery method, and installation
method for waste heat recovery systems, it becomes possible to
effectively use waste heat obtained by bleeding and cooling air
from a plurality of places having different pressures in
compressors, and it is possible to increase heat usage
efficiency.
BRIEF DESCRIPTION OF DRAWINGS
[0071] FIG. 1 is a system diagram of a gas turbine plant in a first
embodiment of the present invention.
[0072] FIG. 2 is a flowchart showing an order of a waste heat
recovery method in the gas turbine plant in the first embodiment of
the present invention.
[0073] FIG. 3 is a system diagram of a gas turbine plant in a
second embodiment of the present invention.
[0074] FIG. 4 is a system diagram of a gas turbine plant in a
modification example of the second embodiment of the present
invention.
[0075] FIG. 5 is a system diagram of a gas turbine plant in a third
embodiment of the present invention.
[0076] FIG. 6 is a system diagram of a gas turbine plant in a
fourth embodiment of the present invention.
[0077] FIG. 7 is a system diagram of a gas turbine plant in a
modification example of the fourth embodiment of the present
invention.
[0078] FIG. 8 is a system diagram of a gas turbine plant in a fifth
embodiment of the present invention.
[0079] FIG. 9 is a system diagram of a gas turbine plant in a sixth
embodiment of the present invention.
[0080] FIG. 10 is a system diagram of a gas turbine plant in a
seventh embodiment of the present invention.
[0081] FIG. 11 is a system diagram of a gas turbine plant in an
eighth embodiment of the present invention.
[0082] FIG. 12 is a system diagram of a gas turbine plant in a
ninth embodiment of the present invention.
[0083] FIG. 13 is a system diagram of a gas turbine plant in a
tenth embodiment of the present invention.
[0084] FIG. 14 is a system diagram of a gas turbine plant in an
eleventh embodiment of the present invention.
[0085] FIG. 15 is a system diagram of a gas turbine plant in a
modification example of the eleventh embodiment of the present
invention.
[0086] FIG. 16 is a system diagram of a gas turbine plant in a
twelfth embodiment of the present invention.
[0087] FIG. 17 is a system diagram of a gas turbine plant in a
thirteenth embodiment of the present invention.
[0088] FIG. 18 is a system diagram showing a first example of a
low-boiling-point medium Rankine cycle that is used in the gas
turbine plant according to the present invention.
[0089] FIG. 19 is a system diagram showing a second example of the
low-boiling-point medium Rankine cycle that is used in the gas
turbine plant according to the present invention.
[0090] FIG. 20 is a system diagram showing a third example of the
low-boiling-point medium Rankine cycle that is used in the gas
turbine plant according to the present invention.
[0091] FIG. 21 is a system diagram showing a fourth example of the
low-boiling-point medium Rankine cycle that is used in the gas
turbine plant according to the present invention.
[0092] FIG. 22 is a system diagram showing a fifth example of the
low-boiling-point medium Rankine cycle that is used in the gas
turbine plant according to the present invention.
DESCRIPTION OF EMBODIMENTS
[0093] Hereinafter, a variety of embodiments of a gas turbine plant
1 according to the present invention will be described using the
accompanying drawings.
First Embodiment
[0094] A first embodiment of the gas turbine plant 1 of the present
invention will be described with reference to FIG. 1.
[0095] The gas turbine plant 1 of the present embodiment includes a
gas turbine 10, a generator 41 that generates power by the driving
of the gas turbine 10, cooling air coolers 54 that cool bleed air
from the gas turbine 10, and a waste heat recovery system 61 having
a waste heat recovery device 51 that recovers waste heat from the
cooling air coolers 54.
[0096] The gas turbine 10 includes a compressor 11 that compresses
air A, a combustor 21 that generates combustion gas G by combusting
a fuel F in the air A compressed using the compressor 11, and a
turbine 31 that is driven using the combustion gas G having a high
temperature and a high pressure.
[0097] The compressor 11 has a compressor rotor 13 that rotates
around a shaft line O and a compressor casing 17 that rotatably
covers the compressor rotor 13.
[0098] The turbine 31 has a turbine rotor 33 that rotates around
the shaft line O due to the combustion gas G from the combustor 21
and a turbine casing 37 that rotatably covers the turbine rotor
33.
[0099] The turbine rotor 33 has a rotor shaft 34 that extends in a
shaft direction parallel to the shaft line O and turbine blades 35
arranged in multiple stages that are fixed to the outer
circumference of the rotor shaft 34. In addition, turbine vanes 38
arranged in multiple stages are fixed to the inner circumferential
surface of the turbine casing 37. A combustion gas passage which
the combustion gas G from the combustor 21 flows through is formed
between the inner circumferential surface of the turbine casing 37
and the outer circumferential surface of the rotor shaft 34. A
cooling air passage (not shown) through which cooling air CA flows
is formed in the rotor shaft 34 and the turbine vanes 38.
[0100] The combustor 21 is fixed to the turbine casing 37. Since
the turbine rotor 33 and the compressor rotor 13 rotate around the
same shaft line O, the turbine rotor 33 and the compressor rotor 13
are coupled with each other and thus form a gas turbine rotor 40. A
rotor of the above-described generator 41 is connected to this gas
turbine rotor 40.
[0101] The waste heat recovery device 51 recovers waste heat from
the cooling air coolers 54 by introducing a heating medium M into
the cooling air coolers 54. Examples of the heating medium M
include liquids such as water, high-boiling-point oil, and liquid
metals and gases such as water vapor, carbon dioxide, and
helium.
[0102] In the cooling air coolers 54, part of the air A compressed
using the compressor 11 is bled, is cooled by exchanging heat
between the air and the heating medium M such as water, and is sent
to the above-described cooling air passage in the turbine 31. In
addition, in the present embodiment, the air A is bled from a
plurality of places having different pressure in the compressor 11,
and the air A bled from the respective places is cooled, thereby
generating cooling air CA.
[0103] In more detail, the air is bled from three places of an
outlet (in the turbine 31 side) of the compressor 11, an
intermediate location in the outlet side of the compressor 11, and
an intermediate location in the inlet side of the compressor
11.
[0104] In addition, the cooling air coolers 54 are each provided so
as to correspond to the respective bleedings. The cooling air
cooler that corresponds to bleeding at the outlet of the compressor
11 will be referred to as a first cooler 54A, the cooling air
cooler that corresponds to bleeding at the intermediate location in
the outlet side will be referred to as a second cooler MB, and the
cooling air cooler that corresponds to bleeding at the intermediate
location in the inlet side will be referred to as a third cooler
54C.
[0105] For example, the cooling air CA generated in the first
cooler 54A, the cooling air CA generated in the second cooler MB,
and the cooling air CA generated in the third cooler 54C are sent
to the turbine rotor 33, the second-stage turbine vane in the
turbine 31, and the third-stage turbine vane in the turbine 31
respectively through the above-described cooling air passage.
[0106] Therefore, the cooling air CA generated in the first cooler
54A has the highest pressure and the highest temperature, and the
cooling air CA generated in the third cooler 54C has the lowest
pressure and the lowest temperature.
[0107] The cooling air CA generated in the respective cooling air
coolers 54 may be used to cool, for example, the combustor 21 or
may be used to cool the turbine blades 35 and the turbine vanes 38
in other stages, but the use of the cooling air is not limited to
the above-described cases.
[0108] According to the above-described gas turbine plant 1, the
compressor 11 in the gas turbine 10 compresses the air A and
supplies the compressed air A to the combustor 21. In addition, the
combustor 21 is also supplied with the fuel F. In the combustor 21,
the fuel F is combusted in the compressed air A, thereby generating
the combustion gas G having a high temperature and a high pressure.
This combustion gas G is sent to the combustion gas passage in the
turbine 31 form the combustor 21 and is used to rotate the turbine
rotor 33. Due to the rotation of the turbine rotor 33, the
generator 41 that is connected to the gas turbine 10 generates
power.
[0109] In addition, since the waste heat recovery system 61 is
provided in the gas turbine plant 1, it is possible to reduce the
power of the compressor 11 by means of bleeding in the compressor
11. Particularly, the air A is bled from a plurality of places
having different pressures in the compressor 11 (bleeding step S1,
refer to FIG. 2), whereby it is possible to limit the efficiency
being decreased in the compressor 11 compared with a case in which
bleeding is carried out at only one place.
[0110] In addition, since bleeding is carried out at places having
different pressures in the compressor 11, and the bled air is
individually cooled (cooling step S2, refer to FIG. 2), it is
possible to generate cooling air CA having different pressures and
temperatures. Therefore, it is possible to recover waste heat
having different temperatures in the first cooler 54A, the second
cooler 54B, and the third cooler 54C using the waste heat recovery
device 51 (waste heat recovery step S3, refer to FIG. 2), and it
becomes possible to use heat in accordance with exhaust gas
temperatures.
[0111] According to the gas turbine plant 1 of the present
embodiment, waste heat generated during the cooling of the air A is
recovered using the waste heat recovery device 51. Therefore, waste
heat from the cooling air coolers 54 is not discharged outside, and
waste heat can be effectively used, and thus it is possible to
increase heat usage efficiency.
[0112] In the present embodiment, all of the waste heat from the
first cooler 54A, the second cooler 54B, and the third cooler 54C
are recovered in the waste heat recovery device 51, but waste heat
from the cooling air coolers 54 in at least two places may be
recovered. That is, it is allowed to provide only two coolers of
the first cooler 54A and the second cooler 54B as the cooling air
coolers 54 and recover waste heat from the first cooler 54A and the
second cooler 54B.
[0113] In addition, in a case in which, due to the low temperature
of waste heat from the third cooler 54C, the value of using the
waste heat is small, and it is inappropriate to recover the waste
heat from the third cooler 54C by providing pipes and the like in
terms of costs, it is also allowed to recover waste heat from the
first cooler 54A and the second cooler 54B among the first cooler
54A, the second cooler 54B, and the third cooler 54C and discharge
waste heat from the third cooler 54C to the outside of the gas
turbine plant 1.
Second Embodiment
[0114] Next, a second embodiment of a gas turbine plant 101
according to the present invention will be described with reference
to FIG. 3.
[0115] In the gas turbine plant 101 of the present embodiment, in
addition to the constitution of the gas turbine plant 1 in the
first embodiment, a waste heat recovery device 151 in a waste heat
recovery system 161 further has a waste heat recovery boiler 153
and a water supply pump 165 that supplies water to the waste heat
recovery boiler 153.
[0116] The waste heat recovery boiler 153 generates steam S using
the heat of the combustion gas G used to drive the turbine 31, that
is, exhaust gas EG exhausted from the gas turbine 10.
[0117] This waste heat recovery boiler 153 has a steam generating
unit 155 that generates the steam S from water supplied using the
water supply pump 165.
[0118] This steam generating unit 155 has a first economizer 156
that heats water W, a second economizer 157 that further heats the
water W that has been heated using the first economizer 156, an
evaporator 158 that turns the water W that has been heated using
the second economizer 157 into steam S, and a superheater 159 that
superheats the steam S generated using the evaporator 158,
generates superheated steam SS, and discharge the superheated steam
to the outside.
[0119] The constituent elements of the steam generating unit 155
are arrange in an order of the superheater 159, the evaporator 158,
the second economizer 157, and the first economizer 156 from the
turbine 31 side to the downstream side of the exhaust gas EG.
[0120] A first recovery line 111 is provided in the waste heat
recovery device 151. Due to the first recovery line 111, after the
water (steam S) is introduced into the first cooler 54A from the
outlet of the evaporator 158 (inlet of the superheater 159), the
water W (steam S) from which waste heat from the first cooler 54A
has been recovered is introduced into the outlet of the superheater
159.
[0121] Similarly, in the waste heat recovery device 151, a second
recovery line 112 is provided on the upper steam side of the first
recovery line 111 in the waste heat recovery boiler 153. Due to the
second recovery line 112, after the water W is introduced into the
second cooler 54B from the outlet of the first economizer 156
(outlet of the second economizer 157), the water W from which waste
heat from the second cooler 54B has been recovered is introduced
into the outlet of the second economizer 157 (inlet of the
evaporator 158).
[0122] Similarly, in the waste heat recovery device 151, a third
recovery line 113 is provided on the upper steam side of the second
recovery line 112 in the waste heat recovery boiler 153. Due to the
third recovery line 113, after the water is introduced into the
third cooler 54C from the inlet of the first economizer 156, the
water from which waste heat from the third cooler 54C has been
recovered is introduced into the outlet of the first economizer 156
(inlet of the second economizer 157).
[0123] As described above, among the cooling air coolers 54, waste
heat from the first cooler 54A which has a higher temperature
(high-temperature waste heat) is recovered to a portion in which
the water W has a higher temperature in the waste heat recovery
boiler 153, and, among the cooling air coolers 54, waste heat from
the third cooler 54C which has a lower temperature (low-temperature
waste heat) is recovered to a portion in which the water (or the
stem S) has a lower temperature in the waste heat recovery boiler
153.
[0124] According to the gas turbine plant 101 of the present
embodiment, since the waste heat recovery boiler 153 is provided,
it is possible to effectively use the exhaust gas EG from the gas
turbine 10 and individually recover waste heat from each of the
cooling air coolers 54 in accordance with the temperatures of the
water W (steam S) in the waste heat recovery boiler 153.
[0125] Therefore, it is possible to effectively use waste heat from
the cooling air coolers 54, and it becomes possible to generate the
exhaust gas EG and superheated steam SS using waste heat and use
the generated superheated steam SS in a variety of ways.
[0126] In the present embodiment, the first recovery line 111, the
second recovery line 112, and the third recovery line 113 are
provided in the above-described locations, but the recovery lines
are not limited to be provided in the above-described locations.
That is, the first recovery line 111, the second recovery line 112,
and the third recovery line 113 may be provided at locations so
that waste heat having a higher temperature is recovered to a
portion of the waste heat recovery boiler 153 in which the water W
(steam S, superheated steam SS) has a higher temperature, and waste
heat having a lower temperature is recovered to a portion of the
waste heat recovery boiler 153 in which the water (stem S,
superheated steam SS) has a lower temperature.
[0127] As shown in FIG. 4, in the present embodiment, it is also
allowed to mix waste heat from the second cooler 54B and the third
cooler 54C and introduce the mixed waste heat into a waste heat
recovery boiler 173.
[0128] Specifically, the second economizer 157 is not provided in
the waste heat recovery boiler 173, and, in a waste heat recovery
device 181, the above-described second recovery line 112 is not
provided, and a branching line 170 is provided so that water flows
into the second cooler 54B and the third cooler 54C in parallel
through the third recovery line 113. In addition, waste heat from
the second cooler 54B and the third cooler 54C are recovered in the
waste heat recovery boiler 173 in a form of mixed waste heat.
[0129] In the present embodiment, since waste heat from the first
cooler 54A has a lower temperature than the mixed waste heat from
the second cooler 54B and the third cooler 54C, it is necessary to
recover the mixed waste heat to a portion having a lower
temperature (or pressure) in the waste heat recovery boiler
173.
[0130] In the above-described gas turbine plant 101, waste heat
from the cooling air coolers 54 are mixed together and recovered,
whereby waste heat temperatures can be adjusted, and convenience in
the use of waste heat is further enhanced. In addition, the
recovery of waste heat becomes easy, and the waste heat recovery
device 181 can be simplified compared with a case in which waste
heat is not mixed together and are individually recovered.
[0131] In addition, in a case in which the temperature difference
between waste heat from the second cooler 54B and the third cooler
54C is small, it is possible to simplify the structure of the waste
heat recovery system 161 while maintaining the recovery efficiency
of waste heat by mixing the waste heat together.
[0132] In FIG. 4, waste heat from the second cooler 54B and the
third cooler 54C are recovered in parallel. However, the third
recovery line 113 may also be provided so that the water W (steam
S, superheated steam SS) flows from the third cooler 54C to the
second cooler 54B in series so that waste heat from the third
cooler 54C which is waste heat having a lower temperature is
recovered first and then waste heat from the second cooler 54B
which is waste heat having a higher temperature is mixed thereinto
(refer to FIG. 11). In this case, waste heat is recovered from
waste heat having a low temperature to waste heat having a high
temperature in order, whereby it is possible to improve the
recovery efficiency of waste heat. Particularly, in a case in which
there is a temperature difference between waste heat from the
second cooler 54B and waste heat from the third cooler 54C, it is
effective to provide the third recovery line.
[0133] In addition, in a case in which waste heat is recovered in
parallel as described above, waste heat may be recovered in series
from time to time (refer to FIG. 12). That is, mixed waste heat may
be recovered by appropriately combining parallel recovery and
serial recovery in accordance with the temperature difference
between waste heat from each of the cooling air coolers 54.
[0134] Furthermore, in a case in which waste heat from the first
cooler 54A, the second cooler 54B, and the third cooler 54C have
the same temperature, all of the waste heat from the cooling air
coolers 54 may be mixed together so as to produced mixed waste
heat.
Third Embodiment
[0135] Next, a third embodiment of a gas turbine plant 201
according to the present invention will be described with reference
to FIG. 5.
[0136] In the gas turbine plant 201 of the present embodiment, in
addition to the constitution of the gas turbine plant 101 in the
second embodiment, a waste heat recovery device 251 in a waste heat
recovery system 261 further has, in addition to a waste heat
recovery boiler 253 and the water supply pump 165, steam turbines
221 that are driven using steam S generated in the waste heat
recovery boiler 253, generators 241 that generate power by the
driving of the steam turbines 221, and a steam condenser 245 that
returns the steam S used to drive the steam turbine 221 to
water.
[0137] In the present embodiment, the water supply pump 165 is
provided between the steam condenser 245 and the waste heat
recovery boiler 253 so that water W in the steam condenser 245
returns to the waste heat recovery boiler 253.
[0138] In addition, the waste heat recovery boiler 253 has a
low-pressure steam generating unit 255 that generates low-pressure
steam LS and a high-pressure steam generating unit 256 that
generates high-pressure steam HS.
[0139] As the steam turbines 221, two steam turbines of a
low-pressure steam turbine 225 and a high-pressure steam turbine
226 are provided.
[0140] The generators 241 are provided to a total of two steam
turbines 221 of the low-pressure steam turbine 225 and the
high-pressure steam turbine 226, but a common generator 241 may be
provided to the low-pressure steam turbine 225 and the
high-pressure steam turbine 226.
[0141] The low-pressure steam generating unit 255 has a
low-pressure economizer 271 that heats water W, a low-pressure
evaporator 272 that turns the water W that has been heated using
the low-pressure economizer 271 into steam S, and a low-pressure
superheater 273 that superheats the steam S generated using the
low-pressure evaporator 272 and generates the low-pressure steam
LS.
[0142] The high-pressure steam generating unit 256 has a
high-pressure water supply pump 274 that pressurizes the water W
that has been heated using the low-pressure economizer 271, a first
high-pressure economizer 275 that heats the water W that has been
pressurized using the high-pressure water supply pump 274, a second
high-pressure economizer 276 that further heats the water W that
has been heated using the first high-pressure economizer 275, a
high-pressure evaporator 277 that turns the water W that has been
heated using the second high-pressure economizer 276 into steam S,
and a high-pressure superheater 278 that superheats the steam S
generated using the high-pressure evaporator 277 and generates the
high-pressure steam HS.
[0143] The constituent elements of the high-pressure steam
generating unit 256 and the low-pressure steam generating unit 255
are arrange in an order of the high-pressure superheater 278, the
high-pressure evaporator 277, the second high-pressure economizer
276, the low-pressure superheater 273, the first high-pressure
economizer 275, the low-pressure evaporator 272, and the
low-pressure economizer 271 from the turbine 31 toward the
downstream side of the exhaust gas EG
[0144] The steam condenser 245 and the low-pressure economizer 271
are connected to the water supply line 211. The above-described
water supply pump 165 is provided in this water supply line 211.
The low-pressure economizer 271 and the first high-pressure
economizer 275 are connected to the high-pressure water supply line
212. The above-described high-pressure water supply pump 274 is
provided in this high-pressure water supply line 212.
[0145] The low-pressure superheater 273 and the inlet of the
low-pressure steam turbine 225 are connected to each other in a
low-pressure steam line 213 that sends the low-pressure steam LS
from the low-pressure superheater 273 to the low-pressure steam
turbine 225. The outlet of the low-pressure steam turbine 225 and
the steam condenser 245 are connected to each other so that the
low-pressure steam LS used to drive the low-pressure steam turbine
225 is supplied to the steam condenser 245. The high-pressure
superheater 278 and the inlet of the high-pressure steam turbine
226 are connected to each other in a high-pressure steam line 214
that sends the high-pressure steam HS from the high-pressure
superheater 278 to the high-pressure steam turbine 226. A
high-pressure steam recovery line 215 is connected to the outlet of
a high-pressure steam turbine 226. This high-pressure steam
recovery line 215 is joined to the low-pressure steam line 213.
[0146] In addition, the first recovery line 111 is provided so that
the water W is introduced from the outlet of the first
high-pressure economizer 275 (the inlet of the second high-pressure
economizer 276) into the first cooler 54A and then the water W from
which waste heat from the first cooler 54A has been recovered is
introduced into the outlet of the second high-pressure economizer
276 (the inlet of the high-pressure evaporator 277).
[0147] The second recovery line 112 is provided so that water is
introduced from the inlet of the first high-pressure economizer 275
(the outlet of the low-pressure economizer 271) into the second
cooler 54B and then the water W from which waste heat from the
second cooler 54B has been recovered is introduced into the outlet
of the first high-pressure economizer 275 (the inlet of the second
high-pressure economizer 276).
[0148] The third recovery line 113 is provided so that water is
introduced from the inlet of the low-pressure economizer 271 (on
the downstream side of the water supply pump 165) into the third
cooler 54C and then the water W from which waste heat from the
third cooler 54C has been recovered is introduced into the outlet
of the low-pressure economizer 271 (which is the inlet of the
low-pressure evaporator 272 and is on the upstream side of the
high-pressure water supply pump 274).
[0149] As described above, in the waste heat recovery device 251,
waste heat from the first cooler 54A having a higher temperature
among the cooling air coolers 54 is recovered to a portion in which
the water W has a higher temperature in the waste heat recovery
boiler 253, and waste heat from the third cooler MC having a lower
temperature among the cooling air coolers 54 is recovered to a
portion in which the water W has a lower temperature in the waste
heat recovery boiler 253.
[0150] According to the gas turbine plant 201 of the present
embodiment, the waste heat recovery system 261 has a so-called
Rankine cycle including the waste heat recovery boiler 253, the
steam turbine 221, and the like as constituent elements. Therefore,
waste heat from the cooling air coolers 54 are recovered to
individual locations having different temperatures in the Rankine
cycle in accordance with the temperatures of the waste heat,
whereby it is possible to efficiently drive the Rankine cycle and
obtain rotative power from waste heat from the cooling air coolers
54, and more effective use of waste heat becomes possible.
[0151] Here, the waste heat recovery boiler 253 may be the waste
heat recovery boiler 153 in the second embodiment.
Fourth Embodiment
[0152] Next, a fourth embodiment of a gas turbine plant 301
according to the present invention will be described with reference
to FIG. 6.
[0153] The gas turbine plant 301 of the present embodiment has the
gas turbine plant 201 in the third embodiment as a basic
constitution and is different from the third embodiment in terms of
the constitution of a waste heat recovery boiler 353 in a waste
heat recovery device 351 and the provision locations of the first
recovery line 111, the second recovery line 112, and the third
recovery line 113.
[0154] The waste heat recovery boiler 353 has, in addition to the
high-pressure steam generating unit 256 and the low-pressure steam
generating unit 255, an intermediate-pressure steam generating unit
355 that generates intermediate-pressure steam MS and a reheating
unit 381 that re-superheats the steam S used to drive the
high-pressure steam turbine 226.
[0155] In addition, as the steam turbines, three steam turbines of
an intermediate-pressure steam turbine 321 in addition to the
low-pressure steam turbine 225 and the high-pressure steam turbine
226 are provided. In the intermediate-pressure steam turbine 321,
similarly, the generator 241 is provided.
[0156] The intermediate-pressure steam generating unit 355 has an
intermediate-pressure water supply pump 374 that pressurizes water
that has been heated using the low-pressure economizer 271, an
intermediate-pressure economizer 371 that heats water that has been
pressurized using the intermediate-pressure water supply pump 374,
an intermediate-pressure evaporator 372 that turns water that has
been heated using the intermediate-pressure economizer 371 into
steam S, and an intermediate-pressure superheater 373 that
superheats the steam S generated using the intermediate-pressure
evaporator 372 and generates the intermediate-pressure steam
MS.
[0157] The reheating unit 381 has a first reheater 382 that heats
the steam S used to drive the high-pressure steam turbine 226 and a
second reheater 383 that further superheats the steam S that has
been superheated using the first reheater 382 and generates
reheated steam RS.
[0158] The constituent elements of the reheating unit 381, the
high-pressure steam generating unit 256, the intermediate-pressure
steam generating unit 355, and the low-pressure steam generating
unit 255 are arrange in an order of the second reheater 383, a
second high-pressure superheater 279, the first reheater 382, the
(first) high-pressure superheater 278, the high-pressure evaporator
277, the second high-pressure economizer 276, the
intermediate-pressure superheater 373, the low-pressure superheater
273, the intermediate-pressure evaporator 372, the first
high-pressure economizer 275, the intermediate-pressure economizer
371, the low-pressure evaporator 272, and the low-pressure
economizer 271 from the turbine 31 toward the downstream side of
the exhaust gas EG.
[0159] The low-pressure economizer 271 and the
intermediate-pressure economizer 371 are connected to each other in
an intermediate-pressure water supply line 314. In the
intermediate-pressure water supply line 314, the above-described
intermediate-pressure water supply pump 374 is provided.
[0160] The outlet of the high-pressure steam turbine 226 and the
inlet of the first reheater 382 are connected to each other in a
high-pressure steam recovery line 215 that sends the high-pressure
steam HS from the high-pressure steam turbine 226 to the first
reheater 382. The outlet of the second reheater 383 and the inlet
of the intermediate-pressure steam turbine 321 are connected to
each other in a reheated steam line 312 that sends the steam S that
has been superheated using the second reheater 383 as reheated
steam RS to the intermediate-pressure steam turbine 321. An
intermediate-pressure steam recovery line 313 is connected to the
outlet of the intermediate-pressure steam turbine 321. This
intermediate-pressure steam recovery line 313 is joined to the
low-pressure steam line 213. An intermediate-pressure steam line
315 is connected to the outlet of the intermediate-pressure
superheater 373. This intermediate-pressure steam line 315 is
joined to the high-pressure steam recovery line 215.
[0161] In addition, the first recovery line 111 is provided so that
water is introduced from the inlet of the second high-pressure
economizer 276 (the outlet of the first high-pressure economizer
275) into the first cooler 54A and then the water W from which
waste heat from the first cooler 54A has been recovered is
introduced into the outlet of the second high-pressure economizer
276 (the inlet of the high-pressure evaporator 277).
[0162] The second recovery line 112 is provided so that water is
introduced from the inlet of the intermediate-pressure economizer
371 (on the downstream side of the intermediate-pressure water
supply pump 374) into the second cooler 54B and then the water W
from which waste heat from the second cooler 54B has been recovered
is introduced into the outlet of the intermediate-pressure
economizer 371 (the inlet of the intermediate-pressure evaporator
372).
[0163] The third recovery line 113 is provided so that water is
introduced from the inlet of the low-pressure economizer 271 into
the third cooler 54C and then the water W from which waste heat
from the third cooler 54C has been recovered is introduced into the
outlet of the low-pressure economizer 271 (which is the inlet of
the low-pressure evaporator 272 and is on the upstream side of the
high-pressure water supply pump 274 and the intermediate-pressure
water supply pump 374).
[0164] As described above, waste heat from the first cooler MA
having a higher temperature among the cooling air coolers 54 is
recovered to a portion in which the water W (or the steam S) has a
higher pressure in the waste heat recovery boiler 353, and waste
heat from the third cooler 54C having a lower temperature among the
cooling air coolers 54 is recovered to a portion in which the water
(or the steam S) has a lower pressure in the waste heat recovery
boiler 353.
[0165] According to the gas turbine plant 301 of the present
embodiment, the waste heat recovery device 351 has a so-called
Rankine cycle including the waste heat recovery boiler 353, a steam
turbine, and the like as constituent elements. Therefore, waste
heat from the cooling air coolers 54 is recovered to individual
locations having different temperatures in the Rankine cycle in
accordance with the temperatures of the waste heat, whereby it is
possible to efficiently drive the Rankine cycle. Therefore, it is
possible to obtain rotative power from waste heat from the cooling
air coolers 54, and more effective use of waste heat becomes
possible.
[0166] The waste heat recovery boiler 353 may be the waste heat
recovery boiler 153 or 253 in the second embodiment and the third
embodiment.
[0167] In addition, as shown in FIG. 7, the gas turbine plant 301
may have an auxiliary compressor 391 that pressurizes the air A
after the air A is bled from the compressor 11 and is introduced
into the first cooler 54A.
[0168] The pressure of the cooling air CA that is generated in the
first cooler 54A is increased using the above-described auxiliary
compressor 391 is increased, whereby it is possible to improve the
cooling effect on high-temperature components. Here, in FIG. 7, the
cooling air CA from the first cooler 54A is used to cool the
combustor 21, but cooling subjects are not particularly
limited.
Fifth Embodiment
[0169] Next, a fifth embodiment of a gas turbine plant 401
according to the present invention will be described with reference
to FIG. 8.
[0170] The gas turbine plant 401 of the present embodiment has the
gas turbine plant 1 in the first embodiment as a basic
constitution, and a waste heat recovery device 451 in a waste heat
recovery system 461 further has a low-boiling-point medium Rankine
cycle 421.
[0171] The low-boiling-point medium Rankine cycle 421 is a cycle
that drives a turbine 422 using a medium having a lower boiling
point than water (hereinafter, referred to as the low-boiling-point
medium LM) that repeats the cycle consisting of condensation.
evaporation and circulation.
[0172] Examples of the low-boiling-point medium LM include the
following substances. [0173] Organic halogen compounds such as
trichloroethylene, tetrachloroethylene, monochlorobenzene,
dichlorobenzene, and perfluorodecaline [0174] Alkanes such as
butane, propane, pentane, hexane, heptane, octane, and decane
[0175] Cyclic alkanes such as cyclopentane and cyclohexane [0176]
Thiophene, ketone, and aromatic compounds [0177] Refrigerants such
as R134a and R245fa [0178] Combinations of the above-described
substances
[0179] In the present embodiment, as the low-boiling-point medium
Rankine cycle 421, three systems having different boiling points
are provided. In addition, a low-boiling-point medium LM having the
highest boiling point (high-temperature low-boiling-point medium
HLM) is used in a high-temperature low-boiling-point medium Rankine
cycle 425, a low-boiling-point medium LLM having the lowest boiling
point (low-temperature low-boiling-point medium) is used in a
low-temperature low-boiling-point medium Rankine cycle 445, and a
low-boiling-point medium having a boiling point between the highest
boiling point and the lowest boiling point
(intermediate-temperature low-boiling-point medium MLM) is used in
an intermediate-temperature low-boiling-point medium Rankine cycle
435.
[0180] The high-temperature low-boiling-point medium Rankine cycle
425 has a high-temperature evaporator 427 that heats and evaporates
the liquid-form high-temperature low-boiling-point medium HLM, a
high-temperature turbine 426 that is driven using the evaporated
high-temperature low-boiling-point medium HLM, a generator 471 that
generates power by the driving of the high-temperature turbine 426,
a high-temperature steam recovery line 428 that connects the outlet
of the high-temperature turbine 426 and the high-temperature
evaporator 427, and a high-temperature pump 429 provided in the
high-temperature steam recovery line 428. The high-temperature
evaporator 427 is provided on the high-temperature turbine 426 side
of the high-temperature pump 429.
[0181] The intermediate-temperature low-boiling-point medium
Rankine cycle 435 has an intermediate-temperature evaporator 437
that heats and evaporates the liquid-form intermediate-temperature
low-boiling-point medium MLM, an intermediate-temperature turbine
436 that is driven using the evaporated intermediate-temperature
low-boiling-point medium MLM, the generator 471 that generates
power by the driving of the intermediate-temperature turbine 436,
an intermediate-temperature steam recovery line 438 that connects
the outlet of the intermediate-temperature turbine 436 and the
intermediate-temperature evaporator 437, and an
intermediate-temperature pump 439 provided in the
intermediate-temperature steam recovery line 438.
[0182] Furthermore, the intermediate-temperature low-boiling-point
medium Rankine cycle 435 has an intermediate-temperature heater 440
which is provided between the intermediate-temperature pump 439 and
the intermediate-temperature evaporator 437 and heats the
intermediate-temperature low-boiling-point medium MLM.
[0183] The intermediate-temperature evaporator 437 is provided
closer to the inlet side of the intermediate-temperature turbine
436 than the intermediate-temperature pump 439 in the
intermediate-temperature steam recovery line 438. Heat is exchanged
between the high-temperature low-boiling-point medium HLM emitted
from the high-temperature turbine 426 in the high-temperature
low-boiling-point medium Rankine cycle 425 and the
intermediate-temperature low-boiling-point medium MLM, whereby the
intermediate-temperature low-boiling-point medium MLM is
evaporated. That is, the intermediate-temperature evaporator 437
also functions as a high-temperature condenser that condenses the
high-temperature low-boiling-point medium HLM.
[0184] The low-temperature low-boiling-point medium Rankine cycle
445 has a low-temperature evaporator 447 that heats and evaporates
the liquid-form low-temperature low-boiling-point medium LLM, a
low-temperature turbine 446 that is driven using the evaporated
low-temperature low-boiling-point medium LLM, the generator 471
that generates power by the driving of the low-temperature turbine
446, a low-temperature steam recovery line 448 that connects the
outlet of the low-temperature turbine 446 and the low-temperature
evaporator 447, a low-temperature pump 450 provided in the
low-temperature steam recovery line 448, and a low-temperature
condenser 449 which is provided between the outlet of the
low-temperature turbine 446 and the low-temperature pump 450 in the
low-temperature steam recovery line 448 and cools and condenses the
low-temperature low-boiling-point medium LLM used to drive the
low-temperature turbine 446.
[0185] Furthermore, the low-temperature low-boiling-point medium
Rankine cycle 445 has a low-temperature heater 452 which is
provided between the low-temperature pump 450 and the
low-temperature evaporator 447 and heats the
intermediate-temperature low-boiling-point medium MLM.
[0186] The low-temperature evaporator 447 is provided closer to the
inlet side of the low-temperature turbine 446 than the
low-temperature pump 450 in the low-temperature steam recovery line
448. Heat is exchanged between the intermediate-temperature
low-boiling-point medium MLM emitted from the
intermediate-temperature turbine 436 in the
intermediate-temperature low-boiling-point medium Rankine cycle 435
and the low-temperature low-boiling-point medium LLM, whereby the
low-temperature low-boiling-point medium LLM is evaporated. That
is, the low-temperature evaporator 447 also functions as an
intermediate-temperature condenser that condenses the
intermediate-temperature low-boiling-point medium MLM.
[0187] In addition, in the high-temperature evaporator 427, waste
heat from the first cooler 54A is recovered through the first
recovery line 111. In the intermediate-temperature heater 440,
waste heat from the second cooler 54B is recovered through the
second recovery line 112. In addition, the low-temperature heater
452, waste heat from the third cooler 54C is recovered through the
third recovery line 113.
[0188] That is, in the present embodiment, waste heat from the
cooling air coolers 54 having a higher temperature is recovered in
the high-temperature low-boiling-point medium Rankine cycle 425,
waste heat from the cooling air coolers 54 having a lower
temperature is recovered in the low-temperature low-boiling-point
medium Rankine cycle 445, and waste heat having an intermediate
temperature is recovered in the intermediate-temperature
low-boiling-point medium Rankine cycle 435.
[0189] According to the gas turbine plant 401 of the present
embodiment, the waste heat recovery device 451 includes the
low-boiling-point medium Rankine cycle 421 which is a so-called
cascade low-boiling-point medium Rankine cycle having three heat
source temperatures. In addition, waste heat from the cooling air
coolers 54 are each recovered in the low-boiling-point medium
Rankine cycle 421 that is driven using the low-boiling-point media
LM having different boiling points in accordance with the
temperatures of the waste heat. Therefore, it is possible to
efficiently drive the low-boiling-point medium Rankine cycle 421
and obtain rotative power from waste heat from the cooling air
coolers 54, and more effective use of waste heat becomes
possible.
[0190] In the present embodiment, waste heat from the cooling air
coolers 54 may be recovered in the low-boiling-point medium Rankine
cycle 421 using the heating medium M.
Sixth Embodiment
[0191] Next, a sixth embodiment of a gas turbine plant 501
according to the present invention will be described with reference
to FIG. 9.
[0192] The gas turbine plant 501 of the present embodiment has the
gas turbine plant 201 in the third embodiment as a basic
constitution and is different from the third embodiment in terms of
a waste heat recovery device 551 in a waste heat recovery system
561.
[0193] The waste heat recovery device 551 has the water supply pump
165, a waste heat recovery boiler 553, the steam turbines 221 that
are driven using steam S generated in the waste heat recovery
boiler 553, the generators 241 that generate power by the driving
of the steam turbines 221, a Rankine cycle 571 having the steam
condenser 245 that returns the steam S used to drive the steam
turbine 221 to water, and a low-boiling-point medium Rankine cycle
521 that is driven by recovering waste heat from the cooling air
coolers 54.
[0194] The waste heat recovery boiler 553 has the low-pressure
steam generating unit 255 that generates low-pressure steam LS and
the high-pressure steam generating unit 256 that generates
high-pressure steam HS. In addition, in the present embodiment,
unlike the third embodiment, only one high-pressure economizer is
provided in the high-pressure steam generating unit 256. This
high-pressure economizer corresponds to the second high-pressure
economizer 276 in the third embodiment. Therefore, the constituent
elements of the high-pressure steam generating unit 256 and the
low-pressure steam generating unit 255 are arrange in an order of
the high-pressure superheater 278, the high-pressure evaporator
277, the high-pressure economizer 276, the low-pressure superheater
273, the low-pressure evaporator 272, and the low-pressure
economizer 271 from the turbine 31 toward the downstream side of
the exhaust gas EG.
[0195] In addition, the first recovery line 111 is provided in the
waste heat recovery device 551 so that water is introduced from the
outlet of the low-pressure economizer 271 (the inlet of the
low-pressure evaporator 272) into the first cooler 54A and then the
water W from which waste heat from the first cooler 54A has been
recovered is introduced into the outlet of the high-pressure
economizer 276 (the inlet of the high-pressure evaporator 277).
[0196] In addition, the second recovery line 112 is provided in the
waste heat recovery device 551 so as to be branched from the first
recovery line 111 on the downstream side of the high-pressure water
supply pump 274 so that water is introduced from the outlet of the
low-pressure economizer 271 (the inlet of the low-pressure
evaporator 272) into the second cooler 54B and then the water W
from which waste heat from the second cooler 54B has been recovered
is introduced into the low-boiling-point medium Rankine cycle
521.
[0197] In addition, the third recovery line 113 is provided in the
waste heat recovery device 551 so as to be branched from the first
recovery line 111 so that the water W is introduced from the outlet
of the low-pressure economizer 271 (the inlet of the low-pressure
evaporator 272) into the third cooler 54C and then the water W from
which waste heat from the third cooler MC has been recovered is
introduced into the low-boiling-point medium Rankine cycle 521.
[0198] In the present embodiment, regarding the second recovery
line 112 and the third recovery line 113, the water W is caused to
flow toward the second cooler 54B and the third cooler 54C through
a common line from the outlet of the low-pressure economizer 271
(the inlet of the low-pressure evaporator 272), and then the water
W is introduced into the second cooler 54B and the third cooler 54C
by branching the line toward the second cooler 54B and the third
cooler 54C.
[0199] The low-boiling-point medium Rankine cycle 521 is, similar
to the fifth embodiment, a cycle that drives a turbine 573 using
the low-boiling-point medium LM that repeats the cycle consisting
of condensation, evaporation, and circulation.
[0200] The low-temperature low-boiling-point medium Rankine cycle
521 has a heater 575 that heats the liquid-form low-boiling-point
medium LM, an evaporator 576 that evaporates water from the heater
575, the turbine 573 that is driven using the evaporated
low-boiling-point medium LM, a generator 574 that generates power
by the driving of the turbine 573, a condenser 578 that condenses
the steam S used to drive the high-pressure steam turbine 226, a
reheater 577 that heats the low-boiling-point medium LM that is
introduced from the condenser 578 using the heat of the
low-boiling-point medium LM used to drive the turbine 573 and sends
the low-boiling-point medium to the evaporator 576, and a pump 579
that circulates the low-boiling-point medium LM.
[0201] The second recovery line 112 is connected to the evaporator
576, and waste heat from the second cooler 54B is delivered to the
low-boiling-point medium LM in the evaporator 576. In addition, the
third recovery line 113 is connected to the heater 575, and waste
heat from the third cooler 54C is delivered to the
low-boiling-point medium LM in the heater 575. After the delivery
of waste heat, the water W introduced through the second recovery
line 112 and the third recovery line 113 is introduced into the
inlet of the low-pressure economizer 271 in the waste heat recovery
boiler 553 in the Rankine cycle 571 through a returning line.
[0202] That is, in the present embodiment, among waste heat from
the cooling air coolers 54, waste heat having a higher temperature
(waste heat from the first cooler 54A) is recovered in the Rankine
cycle 571, and, among waste heat from the cooling air coolers 54,
waste heat having a lower temperature (waste heat from the second
cooler 54B and the third cooler 54C) is recovered in the
low-boiling-point medium Rankine cycle 521.
[0203] Furthermore, waste heat from the second cooler 54B which is
waste heat having a higher temperature among waste heat from the
second cooler 54B and the third cooler 54C is recovered to a
location having a higher temperature in the low-boiling-point
medium Rankine cycle 521.
[0204] According to the gas turbine plant 501 of the present
embodiment, the waste heat recovery device 551 includes the
low-boiling-point medium Rankine cycle 521 and the Rankine cycle
571 that is driven using the water W. In addition, waste heat from
the cooling air coolers 54 is recovered in the Rankine cycle 571 or
the low-boiling-point medium Rankine cycle 521 depending on the
temperature of waste heat, and the Rankine cycle or the
low-boiling-point medium Rankine cycle is driven. Therefore, it is
possible to efficiently drive the low-boiling-point medium Rankine
cycle 521 and the Rankine cycle 571 and obtain rotative power from
waste heat from the cooling air coolers 54, and more effective use
of waste heat becomes possible.
[0205] The waste heat recovery boiler 553 may be the waste heat
recovery boiler 153, 253, or 353 in the second to fourth
embodiments.
Seventh Embodiment
[0206] Next, a seventh embodiment of a gas turbine plant 601
according to the present invention will be described with reference
to FIG. 10.
[0207] The gas turbine plant 601 of the present embodiment has the
gas turbine plant 301 in the fourth embodiment as a basic
constitution and is different from the fourth embodiment in terms
of the recovery location of waste heat from the cooling air coolers
54.
[0208] Similar to the fourth embodiment, the first recovery line
111 is provided so that the water W is introduced from the outlet
of the first high-pressure economizer 275 (the inlet of the second
high-pressure economizer 276) into the first cooler 54A and then
water from which waste heat from the first cooler 54A has been
recovered is introduced into the outlet of the second high-pressure
economizer 276 (the inlet of the high-pressure evaporator 277).
[0209] The second recovery line 112 is provided so as to be
branched from the first recovery line 111 on the upstream side of
the first cooler 54A so that water from the first recovery line 111
is introduced into the second cooler 54B and then the water W from
which waste heat from the second cooler 54B has been recovered is
introduced into the first recovery line 111 on the downstream side
of the first cooler 54A. That is, waste heat from the first cooler
54A and the second cooler 54B is recovered by causing the water W
which is a heating medium M to flow in parallel, and this waste
heat is recovered in the waste heat recovery boiler 353 in a form
of mixed waste heat.
[0210] In addition, in the present embodiment, waste heat from the
third cooler 54C is discharged to the outside of the gas turbine
plant 601. Since the temperature of waste heat from the third
cooler 54C is low, the value of using the waste heat is small, and,
in a case in which it is inappropriate to recover waste heat from
the third cooler 54C by providing pipes and the like in terms of
costs, it is possible to simplify the structure of the waste heat
recovery system 261 using the above-described embodiment and
improve economic efficiency.
[0211] According to the gas turbine plant 601 of the present
embodiment, in a case in which the temperature difference between
waste heat from the first cooler 54A and the second cooler 54B is
small, it is possible to simplify the structure of the waste heat
recovery system 261 while maintaining the recovery efficiency of
waste heat by mixing the waste heat together.
[0212] Here, in a case in which the temperature difference between
waste heat from the third cooler 54C and waste heat from the first
cooler 54A and the second cooler 54B is small, waste heat may be
recovered by causing the water W to flow in parallel with the first
cooler 54A and the second cooler 54B without discharging waste heat
from the third cooler 54C to the outside of the gas turbine plant
601.
Eighth Embodiment
[0213] Next, an eighth embodiment of a gas turbine plant 701
according to the present invention will be described with reference
to FIG. 11.
[0214] The gas turbine plant 701 of the present embodiment has the
gas turbine plant 301 in the fourth embodiment as a basic
constitution and is different from the fourth embodiment in terms
of the recovery location of waste heat from the cooling air coolers
54.
[0215] The second recovery line 112 is provided so that the water W
is introduced from the outlet of the first high-pressure economizer
275 (the inlet of the second high-pressure economizer 276) to the
second cooler 54B.
[0216] The second recovery line is connected to the downstream side
of the second cooler 54B, that is, the outlet side of the first
cooler 54A. The first recovery line 111 is provided so that waste
heat from the first cooler 54A is further recovered to the water W
in which waste heat from the second cooler 5413 has been recovered
and the water W is introduced into the outlet of the second
high-pressure economizer 276 (the inlet of the high-pressure
evaporator 277).
[0217] That is, waste heat is recovered by causing the water W
which is a heating medium M to flow in series toward the first
cooler 54A (high-temperature side cooling air cooler) capable of
recovering waste heat having a higher temperature from the second
cooler 54B (low-temperature side cooling air cooler) capable of
recovering waste heat having a lower temperature. That is, this
waste heat is recovered in the waste heat recovery boiler 353 in a
formed of mixed waste heat.
[0218] In addition, in the present embodiment, waste heat from the
third cooler 54C is discharged to the outside of the gas turbine
plant 701. Since the temperature of waste heat from the third
cooler 54C is low, the value of using the waste heat is small, and,
in a case in which it is inappropriate to recover waste heat from
the third cooler 54C by providing pipes and the like in terms of
costs, it is possible to simplify the structure of the waste heat
recovery system using the above-described embodiment and improve
economic efficiency.
[0219] According to the gas turbine plant 701 of the present
embodiment, it is possible to improve the recovery efficiency of
waste heat by sequentially recovering waste heat in an incremental
order of temperature of the waste heat.
[0220] In a case in which the temperature difference between waste
heat from the first cooler 54A and the second cooler 54B and waste
heat from the third cooler 54C is great, waste heat may be
recovered by causing the water W to flow in parallel with the first
cooler 54A, the second cooler 54B, and the third cooler 54C without
discharging waste heat from the third cooler 54C to the outside of
the gas turbine plant 701.
Ninth Embodiment
[0221] Next, a ninth embodiment of a gas turbine plant 801
according to the present invention will be described with reference
to FIG. 12.
[0222] The gas turbine plant 801 of the present embodiment has the
gas turbine plant 301 in the fourth embodiment as a basic
constitution and is different from the fourth embodiment in terms
of the recovery location of waste heat from the cooling air coolers
54.
[0223] The second recovery line 112 is provided so that the water W
is introduced from the outlet of the first high-pressure economizer
275 (the inlet of the second high-pressure economizer 276) to the
second cooler 54B.
[0224] The third recovery line 113 is provided so as to be branched
from the second recovery line 112 on the upstream side of the
second cooler 54B so that the water W from the second recovery line
112 is introduced into the third cooler 54C and then the water W
from which waste heat from the third cooler 54C has been recovered
is introduced into the second recovery line 112 on the downstream
side of the second cooler 54B in terms of the flow of the water
W.
[0225] That is, waste heat from the second cooler 54B and the third
cooler 54C is recovered by causing the water W which serves as a
heating medium M to flow in parallel. That is, waste heat from the
second cooler 54B and the third cooler 54C is recovered in the
waste heat recovery boiler 353 in a form of mixed waste heat. As
described above, the second cooler 54B and the third cooler 54C
constitute a parallel cooling air cooler group.
[0226] In addition, the first recovery line 111 is connected to the
second recovery line 112 on the downstream side of the
above-described parallel cooling air cooler group, that is, the
outlet side of the second cooler 54B and the third cooler 54C. The
first recovery line 111 is provided so that the water W in which
waste heat from the second cooler 54B and the third cooler 54C is
recovered and then waste heat from the first cooler 54A is further
recovered is introduced into the outlet of the second high-pressure
economizer 276 (the inlet of the high-pressure evaporator 277).
[0227] That is, in the waste heat recovery device 351, the water W
which serves as a heating medium M is caused to flow in series
toward the first cooler 54A from the parallel cooling air cooler
group so that waste heat is recovered in parallel in the parallel
cooling air cooler group which is waste heat having a higher
temperature and then waste heat from the first cooler 54A is
recovered. In addition, this waste heat are recovered in the waste
heat recovery boiler 353 in a formed of mixed waste heat.
[0228] According to the gas turbine plant 801 of the present
embodiment, it is possible to improve the recovery efficiency of
waste heat by sequentially recovering waste heat having a low
temperature (mixed waste heat in the parallel cooling air cooler
group) first and then waste heat having a high temperature (waste
heat from the first cooler 54A). Particularly, in a case in which
waste heat from each of the cooling air coolers 54 which have a
large temperature difference and a small temperature difference are
present together, it is preferable to jointly recover waste heat in
parallel and in series as in the present embodiment from the
viewpoint of efficient waste heat recovery.
Tenth Embodiment
[0229] Next, a tenth embodiment of a gas turbine plant 901
according to the present invention will be described with reference
to FIG. 13.
[0230] The gas turbine plant 901 of the present embodiment has the
gas turbine plant 401 in the fifth embodiment as a basic
constitution and is different from the fifth embodiment in terms of
the low-boiling-point medium Rankine cycle. That is, a waste heat
recovery device 951 in a waste heat recovery system 961 has a
low-boiling-point medium Rankine cycle 910.
[0231] The low-boiling-point medium Rankine cycle 910 has a
high-pressure portion 931, an intermediate-pressure portion 921, a
low-pressure portion 911, a condenser 995 that stores a
low-boiling-point medium LM which will be supplied to the
above-described portions, and a generator 999 that generates power
by the driving of the high-pressure portion 931, the
intermediate-pressure portion 921, and the low-pressure portion
911.
[0232] The low-pressure portion 911 has a low-pressure evaporator
914 that heats and evaporates the liquid-form low-boiling-point
medium LM from the condenser 995 and generates a gas-form
low-pressure low-boiling-point medium LLM, a low-pressure supply
line 981 and a low-pressure pump 913 that supply the liquid-form
low-pressure low-boiling-point medium LLM from the condenser 995 to
the low-pressure evaporator 914, and a low-pressure turbine 912
that is driven using the low-pressure low-boiling-point medium LLM.
The low-pressure low-boiling-point medium LLM emitted from the
low-pressure turbine 912 is sent to the condenser 995 through a
low-pressure recovery line 991.
[0233] The intermediate-pressure portion 921 has an
intermediate-pressure evaporator 924 that heats and evaporates the
liquid-form low-boiling-point medium LM from the condenser 995 and
generates a gas-form intermediate-pressure low-boiling-point medium
MLM, an intermediate-pressure pump 923 that supplies the
liquid-form low-boiling-point medium LM from the condenser 995 to
the intermediate-pressure evaporator 924, and an
intermediate-pressure turbine 922 that is driven using the
intermediate-pressure low-boiling-point medium MLM.
[0234] The low-boiling-point medium LM from the condenser 995 is
supplied to the intermediate-pressure evaporator 924 using the
intermediate-pressure supply line 982 and the intermediate-pressure
pump 923 which are connected so as to be branched from the
low-pressure supply line 981 between the low-pressure pump 913 and
the low-pressure evaporator 914. In addition, the
intermediate-pressure low-boiling-point medium MLM emitted from the
intermediate-pressure turbine 922 is sent to the inlet of the
low-pressure turbine 912 through the intermediate-pressure recovery
line 992 together with the low-pressure low-boiling-point medium
LLM.
[0235] The high-pressure portion 931 has a high-pressure evaporator
934 that heats and evaporates the liquid-form low-boiling-point
medium LM from the condenser 995 and generates a gas-form
high-pressure low-boiling-point medium HLM, a high-pressure pump
933 that supplies the liquid-form low-boiling-point medium LM from
the condenser 995 to the high-pressure evaporator 934, and a
high-pressure turbine 932 that is driven using the high-pressure
low-boiling-point medium HLM.
[0236] The low-boiling-point medium LM from the condenser 995 is
supplied to the high-pressure evaporator 934 using the
high-pressure supply line 983 and the high-pressure pump 933 which
are connected so as to be branched from the intermediate-pressure
supply line 982 between the intermediate-pressure pump 923 and the
intermediate-pressure evaporator 924.
[0237] As described below, the low-boiling-point medium Rankine
cycle 910 serves as a so-called three-pressure low-boiling-point
medium Rankine cycle.
[0238] In addition, waste heat from the first cooler 54A is
introduced into the high-pressure evaporator 934, waste heat from
the second cooler 54B is introduced into the intermediate-pressure
evaporator 924, and waste heat from the third cooler 54C is
introduced into the low-pressure evaporator 914. That is, waste
heat from the cooling air cooler 54 in a place having a higher
pressure is recovered as high-temperature waste heat to a location
in which the low-boiling-point medium LM has a higher temperature
(or pressure), and waste heat from the cooling air cooler 54 in a
place having a lower pressure is recovered as low-temperature waste
heat to a location in which the low-boiling-point medium LM has a
lower temperature (or pressure).
[0239] In the present embodiment, the first cooler 54A and the
high-pressure evaporator 934, the second cooler 54B and the
intermediate-pressure evaporator 924, and the third cooler 54C and
the low-pressure evaporator 914 have the same function. That is,
these components recover waste heat using the low-boiling-point
medium LM as a heating medium.
[0240] According to the gas turbine plant 901 of the present
embodiment, it is possible to drive the low-boiling-point medium
Rankine cycle 910 by carrying out heat exchange between waste heat
and the low-boiling-point medium LM at locations having
temperatures corresponding to the temperatures of individual waste
heats in accordance with the temperatures of the waste heat from
the cooling air coolers 54. Therefore, more effective use of waste
heat becomes possible.
Eleventh Embodiment
[0241] Next, an eleventh embodiment of a gas turbine plant 1A
according to the present invention will be described with reference
to FIG. 14.
[0242] The gas turbine plant 1A of the present embodiment has the
gas turbine plant 401 in the fifth embodiment as a basic
constitution and is different from the fifth embodiment in terms of
the low-boiling-point medium Rankine cycle. That is, a waste heat
recovery device 5A in a waste heat recovery system 6A has a
low-boiling-point medium Rankine cycle 10A.
[0243] The low-boiling-point medium Rankine cycle 10A has a first
heater 11A that heats a liquid-form low-boiling-point medium LM, a
second heater 12A that further heats and evaporate the
low-boiling-point medium LM from the first heater 11A, a turbine
13A that is driven using the evaporated low-boiling-point medium
LM, a generator 14A that generates power by the driving of the
turbine 13A, a condenser 15A that condenses the low-boiling-point
medium LM used to drive the turbine 13A, a reheater 16A that heats
the low-boiling-point medium LM that is introduced from the
condenser 15A using the heat of the low-boiling-point medium LM
used to drive the turbine 13A and sends the low-boiling-point
medium to the second heater 12A, and a pump 17A that circulates the
low-boiling-point medium LM.
[0244] In addition, a first recovery line 3A is provided so that
waste heat from the first cooler 54A is introduced into the second
heater 12A. In addition, a second recovery line 4A is provided so
that waste heat from the second cooler 54B and the third cooler 54C
is introduced into the first heater 11A.
[0245] A first pump 8A is provided in the first recovery line 3A,
and a heating medium M is circulated between the first cooler 54A
and the second heater 12A using the first pump 8A.
[0246] A second pump 9A is provided in the second recovery line 4A,
and the heating medium M is circulated between the second cooler
54B and the third cooler 54C and the first heater 11A using the
second pump 9A.
[0247] The second recovery line 4A causes the heating medium M to
flow into the second cooler 54B and the third cooler 54C in
parallel and then causes the heating medium M to flow out.
[0248] As described above, in the present embodiment, waste heat
from a plurality of cooling air coolers 54 are individually
recovered to locations of two places in which the temperatures of
the low-boiling-point medium LM in the low-boiling-point medium
Rankine cycle 10A are different from each other, that is, in the
first heater 11A and the second heater 12A using the heating medium
M.
[0249] Furthermore, waste heat from the respective cooling air
coolers 54, waste heat from two places (waste heat from the second
cooler 54B and the third cooler 54C), is recovered to the same
location in which the low-boiling-point medium LM in the
low-boiling-point medium Rankine cycle 10A has the same temperature
using the same system of heating medium M.
[0250] That is, waste heat from the cooling air cooler 54 in a
place having a higher pressure is recovered as high-temperature
waste heat to a location in which the low-boiling-point medium LM
has a higher temperature (or pressure), and waste heat from the
cooling air cooler 54 in a place having a lower pressure is
recovered as low-temperature waste heat to a location in which the
low-boiling-point medium LM has a lower temperature (or
pressure).
[0251] According to the gas turbine plant 1A of the present
embodiment, it is possible to drive the low-boiling-point medium
Rankine cycle 10A by carrying out heat exchange between waste heat
and the low-boiling-point medium LM at locations having
temperatures corresponding to the temperatures of individual waste
heats in accordance with the temperatures of the waste heat from
the cooling air coolers 54. Therefore, more effective use of waste
heat becomes possible.
[0252] In addition, waste heat from two places are recovered in
parallel using the same system of heating medium M, whereby, in a
case in which the temperature difference between waste heat
recovered using the cooling air coolers 54 is small, it is possible
to simplify the structure of the waste heat recovery system 6A
while maintaining the recovery efficiency of waste heat by mixing
the waste heat together.
[0253] Meanwhile, in the present embodiment, waste heat from the
second cooler 54B and the third cooler 54C are recovered in
parallel using the same system of heating medium M, the recovery
method of waste heat is not limited thereto. For example, in a case
in which waste heat from the second cooler 54B has a higher
temperature than waste heat from the third cooler 54C, waste heat
may be recovered by causing the heating medium M in series from the
second cooler 54B to the third cooler 54C. In addition, waste heat
may be jointly recovered in series and in parallel from all of the
cooling air coolers 54.
[0254] In addition, as shown in FIG. 15, the low-boiling-point
medium Rankine cycle 10B may be a preheat low-boiling-point medium
Rankine cycle having three heat sources.
[0255] Specifically, the low-boiling-point medium Rankine cycle 10B
has the first heater 11A that heats a liquid-form low-boiling-point
medium LM, the second heater 12A that further heats the
low-boiling-point medium LM from the first heater 11A, the third
heater 12B that further heats the low-boiling-point medium LM from
the second heater 12A, the turbine 13A that is driven using the
evaporated low-boiling-point medium LM, the generator 14A that
generates power by the driving of the turbine 13A, the condenser
15A that condenses the low-boiling-point medium LM used to drive
the turbine 13A, the reheater 16A that heats the low-boiling-point
medium LM that is introduced from the condenser 15A using the heat
of the low-boiling-point medium LM used to drive the turbine 13A
and sends the low-boiling-point medium to a third heater 12B.
[0256] In addition, in the waste heat recovery device 5A, the first
recovery line 3A and the first pump 8A are provided so that waste
heat from the first cooler 54A is introduced into the second heater
12A using the heating medium M.
[0257] In addition, the second recovery line 4A and the second pump
9A are provided so that waste heat from the second cooler 54B is
introduced into the second heater 12A using different systems of
heating media M from that in the first cooler MA.
[0258] In addition, the third recovery line 4B and the third pump
9B are provided so that waste heat from the third cooler MC is
introduced into the first heater 11A using different systems of
heating media M from those in the first cooler 54A and the second
cooler 54B.
[0259] As described above, in the present embodiment, waste heat
from the each of the cooling air coolers 54 may be individually
recovered to portions in which the low-boiling-point medium LM has
different temperatures (or pressures) in the low-boiling-point
medium Rankine cycle 10B.
Twelfth Embodiment
[0260] Next, a twelfth embodiment of a gas turbine plant 1C
according to the present invention will be described with reference
to FIG. 16.
[0261] The gas turbine plant 1C of the present embodiment has the
gas turbine plant 1 in the first embodiment as a basic constitution
and is different from the first embodiment in terms of a waste heat
recovery device 5C in a waste heat recovery system 6C.
[0262] That is, the waste heat recovery device 5C has the cooling
air coolers 54, an evaporator 9C that is separately provided from
the cooling air coolers 54, a recovery line 2C and a returning line
3C which connect the first cooler 54A among the cooling air coolers
54 and a evaporator 9C, a pump 8C that circulates a heating medium
M between the first cooler 54A and the evaporator 9C through the
recovery line 2C and the returning line 3C, and a low-boiling-point
medium Rankine cycle 10C in which the low-boiling-point medium LM
repeats a cycle consisting of condensation, evaporation in the
evaporator 9C, and circulation.
[0263] Furthermore, the waste heat recovery device 5C has bypass
lines 4C which allow the recovery line 2C and the returning line 3C
to communicate without the cooling air coolers 54 and the
evaporator 9C being therebetween and thus enables the heating media
M to flow therebetween, flow rate-adjusting valves 7C that adjust
the flow rates of the heating media M which flow through the bypass
lines 4C, and a control device 13C that adjusts the flow
rate-adjusting valves 7C.
[0264] The recovery line 2C is provided so as to enable the heating
medium M from which waste heat has been recovered in the first
cooler 54A to flow toward the evaporator 9C.
[0265] The returning line 3C communicates with the recovery line 2C
and is provided so as to enable the heating medium M which has
delivered waste heat to the evaporator 9C to flow toward the first
cooler 54A.
[0266] In the present embodiment, the pump 8C is provided in the
returning line 3C.
[0267] In the present embodiment, as the bypass lines 4C, two lines
of a first bypass line 11C and a second bypass line 12C are
provided.
[0268] The first bypass line 11C connects the recovery line 2C and
the returning line 3C so that the downstream side of the pump 8C
which serves as the inlet side of the first cooler 54A in terms of
the flow of the heating medium M and the outlet side of the first
cooler 54A communicate with each other. Therefore, the heating
medium M is introduced into the recovery line 2C through the first
bypass line 11C without flowing through the first cooler 54A from
the recovery line 2C.
[0269] The second bypass line 12C connects the recovery line 2C and
the returning line 3C so that the inlet side of the evaporator 9C
and the upstream side of the pump 8C which serves as the outlet
side of the evaporator 9C in terms of the flow of the heating
medium M communicate with each other. Therefore, the heating medium
M is introduced into the returning line 3C through the second
bypass line 12C without flowing through the evaporator 9C from the
recovery line 2C.
[0270] The flow rate-adjusting valves 7C are respectively provided
at intermediate locations of the first bypass line 11C and the
second bypass line 12C. It becomes possible to adjust the flow
rates of the heating medium M that flows through the first bypass
line 11C and the second bypass line 12C by adjusting the flow
rate-adjusting valves 7C.
[0271] The control device 13C adjusts the flow rate-adjusting
valves 7C and thus adjusts the flow rates of the heating medium M
that flows through the first bypass line 11C and the second bypass
line 12C so that the temperature of cooling air CA generated in the
first cooler 54A becomes constant.
[0272] The low-boiling-point medium Rankine cycle 10C has the
evaporator 9C that heats and evaporates a liquid-form
low-boiling-point medium LM, a turbine 14C that is driven using the
evaporated low-boiling-point medium LM, and a generator 15C that
generates power by the driving of the turbine 14C.
[0273] Furthermore, this low-boiling-point medium Rankine cycle 10C
has a low-boiling-point medium recovery line 16C that connects the
outlet of the turbine 14C and the evaporator 9C, a pump 17C
provided in the low-boiling-point medium recovery line 16C, and a
condenser 18C which is provided between the outlet of the turbine
14C and the pump 17C in the low-boiling-point medium recovery line
16C and cools and condenses the low-boiling-point medium LM used to
drive the turbine 14C. That is, the low-boiling-point medium
Rankine cycle 10C of the present embodiment serves as a so-called
simple low-boiling-point medium Rankine cycle.
[0274] According to the gas turbine plant 1C of the present
embodiment, it is possible to obtain rotative power from waste heat
from the first cooler 54A using the low-boiling-point medium
Rankine cycle 10C. In addition, the waste heat recovery device 5C
recovers waste heat in the low-boiling-point medium Rankine cycle
10C using different systems of heating media M from the
low-boiling-point medium LM. Therefore, it is possible to select a
variety of heating media M having higher heat exchange efficiencies
in accordance with the temperature and the like of waste heat. In
addition, it becomes possible to reduce the sizes of devices that
carry out heat exchange in the first cooler 54A, the evaporator 9C,
and the like using the liquid-form heating medium M.
[0275] In addition, heat is exchanged using the heating medium M,
whereby it becomes easy to control heat exchange, and more
effective use of waste heat becomes possible.
[0276] In addition, as the waste heat recovery device 5C, the
bypass lines 4C, the flow rate-adjusting valves 7C, and the control
device 13C are provided. Therefore, the flow rates of the heating
medium M that flows through the bypass lines 4C are adjusted using
the flow rate-adjusting valves 7C, whereby it is possible to adjust
the flow rates of the heating medium M that flows into the first
cooler MA and the evaporator 9C, and it becomes possible to change
the recovery amount of waste heat. As a result, it becomes possible
to adjust the temperature of the cooling air CA that is generated
in the first cooler MA.
[0277] In addition, according to the control device 13C, it is
possible to set the temperature of the cooling air CA to be
constant by adjusting the recovery amount of waste heat. Therefore,
it becomes possible to maintain the temperature of cooling air CA
in an optimal state and improve the cooling effect on
high-temperature components or it is possible to prevent the
temperatures of high-temperature components from being excessively
decreased and limit a decrease in the operation efficiency of the
system.
[0278] Any one of the first bypass line 11C and the second bypass
line 12C may be provided as the bypass line 4C.
[0279] In addition, the present invention is not limited to a case
in which the low-boiling-point medium Rankine cycle 10C is provided
in the first cooler MA as in the present embodiment, and the
low-boiling-point medium Rankine cycle 10C may be provided in the
second cooler 54B and the third cooler 54C. The low-boiling-point
medium Rankine cycles 10C may be provided in a plurality of coolers
of the first cooler 54A, the second cooler 54B, and the third
cooler 54C.
Thirteenth Embodiment
[0280] Next, a thirteenth embodiment of a gas turbine plant ID
according to the present invention will be described with reference
to FIG. 17.
[0281] The gas turbine plant ID of the present embodiment has the
gas turbine plant 1 in the first embodiment as a basic constitution
and is different from the first embodiment in terms of a waste heat
recovery device 5D in a waste heat recovery system 6D.
[0282] The waste heat recovery device 5D has the cooling air
coolers 54, the evaporator 9C, the recovery line 2C, a returning
line 3D, a waste heat recovery boiler 19D that heats the water W
using exhaust gas EG from the turbine 14C and introduces the water
W into the first cooler 54A among the cooling air coolers 54
through the returning line 3D, and a water supply pump 20D that
supplies water to the waste heat recovery boiler 19D.
[0283] The waste heat recovery boiler 19D generates steam S using
the heat of the combustion gas G used to drive the turbine 14C,
that is, exhaust gas EG exhausted from the gas turbine 10.
[0284] This waste heat recovery boiler 19D has substantially the
same constitution as that of the waste heat recovery boiler 153 of
the second embodiment.
[0285] That is, the waste heat recovery boiler has a steam
generating unit 21D that generates the steam S from the water W
supplied using the water supply pump 20D.
[0286] This steam generating unit 21D has a first economizer 22D
that heats the water W from the water supply pump 20D, a second
economizer 23D that further heats the water W that has been heated
using the first economizer 22D, a flow rate-adjusting valve 30D
provided between the first economizer 22D and the second economizer
23D, an evaporator 24D that turns the water W that has been heated
using the second economizer 23D into steam S, and a superheater 25D
that superheats the steam S generated using the evaporator 24D,
generates superheated steam SS, and discharge the superheated steam
SS to the outside.
[0287] The constituent elements of the steam generating unit 21D
are arrange in an order of the superheater 25D, the evaporator 24D,
the second economizer 23D, and the first economizer 22D from the
turbine 31 side to the downstream side of the exhaust gas EG.
[0288] The returning line 3D has an introduction line 31D and an
introduction pump 32D which connect the outlet of the first
economizer 22D (between the flow rate-adjusting valve 30D and the
first economizer 22D) and the first cooler MA so as to enable the
water W from the waste heat recovery boiler 19D to be introduced
into the first cooler 54A from the outlet of the first economizer
22D and a releasing line 33D which connects the evaporator 9C and
the inlet of the second economizer 23D (between the flow
rate-adjusting valve 30D and the inlet of the second economizer
23D) and releases the water W to the waste heat recovery boiler 19D
from the evaporator 9C.
[0289] According to the gas turbine plant ID of the present
embodiment, the waste heat recovery boiler 19D is provided as the
waste heat recovery device 5D, whereby it is possible to recover
waste heat from the cooling air coolers 54 using the water W from
the waste heat recovery boiler 19D as a heating medium. Therefore,
it becomes possible to reduce costs by sharing facilities, and it
is possible to make the waste heat recovery system 6D function as a
part of a cogeneration system.
[0290] In addition, since it becomes possible to adjust the flow
rates of the water W that flows through the first cooler 54A and
the evaporator 9C by adjusting the flow rates using the flow
rate-adjusting valve 30D, it becomes possible to adjust the
recovery amount of waste heat and obtain cooling air CA having a
desired temperature.
[0291] Here, in the present embodiment, the waste heat recovery
device 5D may also further include a steam turbine that is driven
using steam S that is generated using the waste heat recovery
boiler 19D (for example, refer to FIG. 9). In addition, in this
case, it is possible to recover waste heat from the first cooler
54A using the water W discharged from the steam turbine as a
heating medium. That is, it is possible to make the waste heat
recovery system 6D function as a part of a cogeneration system, and
it becomes possible to reduce costs by sharing facilities.
Other Modification Examples of Gas Yurbine Plant
[0292] The above-described gas turbine plants of the respective
embodiments and modification examples have been described; however,
as described below, it is possible to employ a variety of other
modification examples.
[0293] For example, the constitutions of the respective embodiments
described above can be appropriately combined together.
Specifically, in the third and fourth embodiments, the steam
turbine may not be necessarily provided.
[0294] Furthermore, as the above-described low-boiling-point medium
Rankine cycles that have been described in the embodiments,
low-boiling-point medium Rankine cycles having other forms can also
be applied.
[0295] Examples of other low-boiling-point medium Rankine cycles
include regenerative low-boiling-point medium Rankine cycles as
shown in FIG. 18. Specifically, this low-boiling-point medium
Rankine cycle 10E has a heater 14E that heats and evaporates a
liquid-form low-boiling-point medium LM, a pump 15E that introduces
the low-boiling-point medium LM into the heater 14E, a turbine 16E
that is driven using the evaporated low-boiling-point medium LM, a
generator 17E that generates power by the driving of the turbine
16E, a condenser 18E that condenses the low-boiling-point medium LM
used to drive the turbine 16E, and a reheater 19E that preheats the
low-boiling-point medium LM that is to be introduced from the
condenser 18E into the heater 14E using the heat of the
low-boiling-point medium LM used to drive the turbine 16E and sends
the low-boiling-point medium to the heater 14E.
[0296] The low-boiling-point medium Rankine cycle 1OF shown in FIG.
19 is a so-called reheated low-boiling-point medium Rankine cycle.
This low-boiling-point medium Rankine cycle 1OF has an evaporator
14F that heats and evaporates a liquid-form low-boiling-point
medium LM, a pump 15F that introduces the low-boiling-point medium
LM into the evaporator 14F, a high-pressure turbine 16F that is
driven using the evaporated low-boiling-point medium LM, a reheater
17F that recovers the low-boiling-point medium LM from the outlet
of the high-pressure turbine 16F and heats the low-boiling-point
medium, a low-pressure turbine 18F that is driven using the
low-boiling-point medium LM from the reheater 17F, a condenser 19F
that condenses the low-boiling-point medium LM used to drive the
low-pressure turbine 18F, and a generator 20F that generates power
by the driving of the high-pressure turbine 16F and the
low-pressure turbine 18F.
[0297] A low-boiling-point medium Rankine cycle 10G shown in FIG.
20 is a so-called multi-pressure low-boiling-point medium Rankine
cycle. This low-boiling-point medium Rankine cycle 10G has a
high-pressure portion 14G, a low-pressure portion 15G, and a
generator 16G that generates power by the driving of the
high-pressure portion 14G and the low-pressure portion 15G.
[0298] The low-pressure portion 15G has a low-pressure evaporator
18G that heats and evaporates a liquid-form low-boiling-point
medium LM and generates a gas-form low-pressure low-boiling-point
medium LLM, a low-pressure pump 19G that supplies the liquid-form
low-pressure low-boiling-point medium LM to the low-pressure
evaporator 18G, a low-pressure turbine 20G that is driven using the
low-pressure low-boiling-point medium LLM, and a condenser 17G that
condenses the low-pressure low-boiling-point medium LLM emitted
from the low-pressure turbine 20G
[0299] The high-pressure portion 14G has a high-pressure evaporator
21G that heats and evaporates the liquid-form high-boiling-point
medium LM from the condenser 17G and generates a gas-form
high-pressure high-boiling-point medium HLM, a high-pressure pump
22G that supplies the liquid-form low-boiling-point medium LM from
the condenser 17G to the high-pressure evaporator 21G, and a
high-pressure turbine 23G that is driven using the high-pressure
low-boiling-point medium HLM.
[0300] The low-boiling-point medium LM from the condenser 17G is
supplied to the high-pressure evaporator 21G using the
high-pressure pump 22G from between the low-pressure pump 19G and
the low-pressure evaporator 18G
[0301] The generator 16G generates power by the driving of the
high-pressure turbine 23G and the low-pressure turbine 20G.
[0302] A low-boiling-point medium Rankine cycle 10H shown in FIG.
21 is a so-called preheat low-boiling-point medium Rankine cycle
having four heat source temperatures.
[0303] The low-boiling-point medium Rankine cycle 10H has a first
heater 11H that heats a liquid-form low-boiling-point medium LM, a
second heater 12H that further heats the low-boiling-point medium
LM from the first heater 11H, a third heater 13H that further heats
the low-boiling-point medium LM from the second heater 12H, a
fourth heater 14H that further heats and evaporate the
low-boiling-point medium LM from the third heater 13H, a turbine
15H that is driven using the evaporated low-boiling-point medium
LM, a generator 16H that generates power by the driving of the
turbine 15H, a condenser 17H that condenses the low-boiling-point
medium LM used to drive the turbine 15H, and a reheater 18H that
heats the low-boiling-point medium LM which has been introduced
from the condenser 17H using the heat of the low-boiling-point
medium LM used to drive the turbine 15H and sends the
low-boiling-point medium to the third heater 13H.
[0304] A low-boiling-point medium Rankine cycle 10I shown in FIG.
22 is a so-called cascade low-boiling-point medium Rankine cycle
having two heat source temperatures. This low-boiling-point medium
Rankine cycle 101 has a high-temperature portion 141 and a
low-temperature portion 15I.
[0305] The high-temperature portion 14I has a high-temperature
evaporator 16I that heats and evaporates a low-boiling-point medium
LM and generates a gas-form high-temperature low-boiling-point
medium LM3, a high-temperature turbine 17I that is driven using the
high-temperature low-boiling-point medium LM3, a generator 18I that
generates power by the driving of the high-temperature turbine 17I,
a high-temperature condenser 19I that condenses the
high-temperature low-boiling-point medium LM3 emitted from the
high-temperature turbine 17I, and a high-temperature pump 20I that
circulates the low-boiling-point medium LM (and the
high-temperature low-boiling-point medium LM3).
[0306] The low-temperature portion 15I has a low-temperature
evaporator 21I that heats and evaporates the low-boiling-point
medium LM and generates a gas-form low-temperature
low-boiling-point medium LM1, a low-temperature turbine 22I that is
driven using the low-temperature low-boiling-point medium LM1, a
generator 23I that generates power by the driving of the
low-temperature turbine 22I, a low-temperature condenser 24I that
condenses the low-temperature low-boiling-point medium LM1 emitted
from the low-temperature turbine 22I, a low-temperature heater 25I
which is provided between the low-temperature evaporator 21I, and
the low-temperature condenser 24I and preheats the low-temperature
low-boiling-point medium LM1, and a low-temperature pump 26I that
circulates the low-boiling-point medium LM (and the low-temperature
low-boiling-point medium LM1).
[0307] In an example of FIG. 22, the low-temperature heater 25I and
the high-temperature condenser 191 form a unit body and perform
mutual functions.
[0308] The present invention is not limited to the above-described
low-boiling-point medium Rankine cycle, and, additionally, it is
possible to apply low-boiling-point medium Rankine cycles having a
variety of forms to the present invention.
[0309] In addition, for example, the waste recovery heat systems 61
(161, 261, 361, 461, 561, 961, 6A, 6C, and 6D) in the respective
embodiments described above may be additionally provided in gas
turbine plants which are not provided with any waste heat recovery
systems. In addition, the above-described low-boiling-point medium
Rankine cycles 421 (521, 910, 10A, 10B, 10C, 10E, 10F, 10G, 10H,
and 10I) may be additionally provided in gas turbine plants which
are provided with cooling air coolers. In this case, the cooling
air coolers 54 may be changed as necessary. In addition, in a case
in which waste heat is recovered in low-boiling-point medium
Rankine cycles using heating media M, it is also possible to
additionally provide systems of heating media M. In addition, in
gas turbines in which waste heat recovery boilers are installed and
gas turbines additionally provided with the waste heat recovery
boiler 153 (173, 253, 353, 553, or 19D), it is also possible to
additionally provide systems that recover waste heat using water W
from the waste heat recovery boiler.
REFERENCE SIGNS LIST
[0310] 1 gas turbine plant
[0311] 10 gas turbine
[0312] 11 compressor
[0313] 13 compressor rotor
[0314] 17 compressor casing
[0315] 21 combustor
[0316] 31 turbine
[0317] 33 turbine rotor
[0318] 34 rotor shaft
[0319] 35 turbine blade
[0320] 37 turbine casing
[0321] 38 turbine vane
[0322] 40 gas turbine rotor
[0323] 41 generator
[0324] 54 cooling air cooler
[0325] 51 waste heat recovery device
[0326] 61 waste heat recovery system
[0327] 54A first cooler
[0328] 54B second cooler
[0329] 54C third cooler
[0330] O shaft line
[0331] CA cooling air
[0332] M heating medium
[0333] A air
[0334] F fuel
[0335] G combustion gas
[0336] 101 gas turbine plant
[0337] 111 first recovery line
[0338] 112 second recovery line
[0339] 113 third recovery line
[0340] 151 waste heat recovery device
[0341] 153 waste heat recovery boiler
[0342] 155 steam generating unit
[0343] 156 first economizer
[0344] 157 second economizer
[0345] 158 evaporator
[0346] 159 superheater
[0347] 161 waste heat recovery system
[0348] 165 water supply pump
[0349] EG exhaust gas
[0350] W water
[0351] S steam
[0352] SS superheated steam
[0353] 181 waste heat recovery device
[0354] 173 waste heat recovery boiler
[0355] 170 branching line
[0356] 201 gas turbine plant
[0357] 211 water supply pump
[0358] 212 high-pressure water supply line
[0359] 213 low-pressure steam line
[0360] 214 high-pressure steam line
[0361] 215 high-pressure steam recovery line
[0362] 221 steam turbine
[0363] 225 low-pressure steam turbine
[0364] 226 high-pressure steam turbine
[0365] 241 generator
[0366] 245 steam condenser
[0367] 251 waste heat recovery device
[0368] 253 waste heat recovery boiler
[0369] 255 low-pressure steam generating unit
[0370] 256 high-pressure steam generating unit
[0371] 261 waste heat recovery system
[0372] 271 low-pressure economizer
[0373] 272 low-pressure evaporator
[0374] 273 low-pressure superheater
[0375] 274 high-pressure water supply pump
[0376] 275 first high-pressure economizer
[0377] 276 second high-pressure economizer
[0378] 277 high-pressure evaporator
[0379] 278 (first) high-pressure superheater
[0380] 279 second high-pressure superheater
[0381] LS low-pressure steam
[0382] HS high-pressure steam
[0383] 301 gas turbine plant
[0384] 312 reheated steam line
[0385] 313 intermediate-pressure steam recovery line
[0386] 314 intermediate-pressure water supply line
[0387] 315 intermediate-pressure steam line
[0388] 321 intermediate-pressure steam turbine
[0389] 351 waste heat recovery device
[0390] 353 waste heat recovery boiler
[0391] 355 intermediate-pressure steam generating unit
[0392] 361 waste heat recovery system
[0393] 371 intermediate-pressure economizer
[0394] 372 intermediate-pressure evaporator
[0395] 373 intermediate-pressure superheater
[0396] 374 intermediate-pressure water supply pump
[0397] 381 reheating unit
[0398] 382 first reheater
[0399] 383 second reheater
[0400] 391 auxiliary compressor
[0401] 401 gas turbine plant
[0402] 461 waste heat recovery system
[0403] 421 low-boiling-point medium Rankine cycle
[0404] 422 turbine
[0405] 425 high-temperature low-boiling-point medium Rankine
cycle
[0406] 426 high-temperature turbine
[0407] 427 high-temperature evaporator
[0408] 428 high-temperature steam recovery line
[0409] 429 high-temperature pump
[0410] 435 intermediate-temperature low-boiling-point medium
Rankine cycle
[0411] 436 intermediate-temperature turbine
[0412] 437 intermediate-temperature evaporator
[0413] 438 intermediate-temperature steam recovery line
[0414] 439 intermediate-temperature pump
[0415] 440 intermediate-temperature heater
[0416] 445 low-temperature low-boiling-point medium Rankine
cycle
[0417] 446 low-temperature turbine
[0418] 447 low-temperature evaporator
[0419] 448 low-temperature steam recovery line
[0420] 449 low-temperature condenser
[0421] 450 low-temperature pump
[0422] 451 waste heat recovery device
[0423] 452 low-temperature heater
[0424] 471 generator
[0425] LM low-boiling-point medium
[0426] HLM high-temperature low-boiling-point medium
[0427] MLM intermediate-temperature low-boiling-point medium
[0428] LLM low-temperature low-boiling-point medium
[0429] RS reheated steam
[0430] 501 gas turbine plant
[0431] 521 low-boiling-point medium Rankine cycle
[0432] 551 waste heat recovery device
[0433] 553 waste heat recovery boiler
[0434] 561 waste heat recovery system
[0435] 571 Rankine cycle
[0436] 573 turbine
[0437] 574 generator
[0438] 575 heater
[0439] 576 evaporator
[0440] 577 reheater
[0441] 578 condenser
[0442] 579 pump
[0443] 601 gas turbine plant
[0444] 701 gas turbine plant
[0445] 801 gas turbine plant
[0446] 901 gas turbine plant
[0447] 910 low-boiling-point medium Rankine cycle
[0448] 911 low-pressure portion
[0449] 912 low-pressure turbine
[0450] 913 low-pressure pump
[0451] 914 low-pressure evaporator
[0452] 921 intermediate-pressure portion
[0453] 922 intermediate-pressure turbine
[0454] 923 intermediate-pressure pump
[0455] 924 intermediate-pressure evaporator
[0456] 931 high-pressure portion
[0457] 932 high-pressure turbine
[0458] 533 high-pressure pump
[0459] 934 high-pressure evaporator
[0460] 951 waste heat recovery device
[0461] 961 waste heat recovery system
[0462] 981 low-pressure supply line
[0463] 982 intermediate-pressure supply line
[0464] 983 high-pressure supply line
[0465] 991 low-pressure recovery line
[0466] 992 intermediate-pressure recovery line
[0467] 995 condenser
[0468] 999 generator
[0469] 1A gas turbine plant
[0470] 3A first recovery line
[0471] 4A second recovery line
[0472] 5A waste heat recovery device
[0473] 6A waste heat recovery system
[0474] 8A first pump
[0475] 9A second pump
[0476] 10A low-boiling-point medium Rankine cycle
[0477] 11A first heater
[0478] 12A second heater
[0479] 13A turbine
[0480] 14A generator
[0481] 15A condenser
[0482] 16A reheater
[0483] 17A pump
[0484] 4B third recovery line
[0485] 9B third pump
[0486] 10B low-boiling-point medium Rankine cycle
[0487] 12B third heater
[0488] 1C gas turbine plant
[0489] 2C recovery line
[0490] 3C returning line
[0491] 4C bypass line
[0492] 5C waste heat recovery device
[0493] 6C waste heat recovery system
[0494] 7C flow rate-adjusting valve
[0495] 8C pump
[0496] 9C evaporator
[0497] 10C low-boiling-point medium Rankine cycle
[0498] 11C first bypass line
[0499] 12C second bypass line
[0500] 13C control device
[0501] 14C turbine
[0502] 15C generator
[0503] 16C low-boiling-point medium recovery line
[0504] 17C pump
[0505] 18C condenser
[0506] 1D gas turbine plant
[0507] 3D returning line
[0508] 5D waste heat recovery device
[0509] 6D waste heat recovery system
[0510] 19D waste heat recovery boiler
[0511] 20D water supply pump
[0512] 21D steam generating unit
[0513] 22D first economizer
[0514] 23D second economizer
[0515] 24D evaporator
[0516] 25D superheater
[0517] 30D flow rate-adjusting valve
[0518] 31D introduction line
[0519] 32D introduction pump
[0520] 33D releasing line
[0521] 10E low-boiling-point medium Rankine cycle
[0522] 14E heater
[0523] 15E pump
[0524] 16E turbine
[0525] 17E generator
[0526] 18E condenser
[0527] 19E reheater
[0528] 10F low-boiling-point medium Rankine cycle
[0529] 14F evaporator
[0530] 15F pump
[0531] 16F high-pressure turbine
[0532] 17F reheater
[0533] 18F low-pressure turbine
[0534] 19F condenser
[0535] 20F generator
[0536] 10G low-boiling-point medium Rankine cycle
[0537] 14G high-pressure portion
[0538] 15G low-pressure portion
[0539] 16G generator
[0540] 17G condenser
[0541] 18G low-pressure evaporator
[0542] 19G low-pressure pump
[0543] 20G low-pressure turbine
[0544] 21G high-pressure evaporator
[0545] 22G high-pressure pump
[0546] 23G high-pressure turbine
[0547] 10H low-boiling-point medium Rankine cycle
[0548] 11H first heater
[0549] 12H second heater
[0550] 13H third heater
[0551] 14H fourth heater
[0552] 15H turbine
[0553] 16H generator
[0554] 17H condenser
[0555] 18H reheater
[0556] 10I low-boiling-point medium Rankine cycle
[0557] 14I high-temperature portion
[0558] 15I low-temperature portion
[0559] 16I high-temperature evaporator
[0560] 17I high-temperature turbine
[0561] 18I generator
[0562] 19I high-temperature condenser
[0563] 20I high-temperature pump
[0564] 21I low-temperature evaporator
[0565] 22I low-temperature turbine
[0566] 23I generator
[0567] 24I low-temperature condenser
[0568] 25I low-temperature heater
[0569] 26I low-temperature pump
[0570] LM1 low-temperature low-boiling-point medium
[0571] LM3 high-temperature low-boiling-point medium
* * * * *