U.S. patent application number 12/870404 was filed with the patent office on 2011-03-03 for gas-turbine inlet-air cooling system.
This patent application is currently assigned to Kabushiki Kaisha Toshiba. Invention is credited to Yuichi CHAMOTO, Hidenori Fukutake, Masao Ito.
Application Number | 20110052377 12/870404 |
Document ID | / |
Family ID | 43625206 |
Filed Date | 2011-03-03 |
United States Patent
Application |
20110052377 |
Kind Code |
A1 |
CHAMOTO; Yuichi ; et
al. |
March 3, 2011 |
GAS-TURBINE INLET-AIR COOLING SYSTEM
Abstract
A gas-turbine inlet-air cooling system includes: a spray device
configured to spray cooling water into inlet air entered into a
compressor of a gas turbine facility to thereby cool the inlet air;
and a cooling-water feed system configured to supply the cooling
water to the spray device. The cooling-water feed system including:
at least one tank configured to reserve the cooling water; a
plurality of pipes connected to the tank independently of each
other and configured to feed the cooling water to the spray device;
and pumps installed for the pipes, respectively.
Inventors: |
CHAMOTO; Yuichi;
(Setagaya-Ku, JP) ; Fukutake; Hidenori;
(Yokohama-Shi, JP) ; Ito; Masao; (Yokohama-Shi,
JP) |
Assignee: |
Kabushiki Kaisha Toshiba
Tokyo
JP
|
Family ID: |
43625206 |
Appl. No.: |
12/870404 |
Filed: |
August 27, 2010 |
Current U.S.
Class: |
415/180 |
Current CPC
Class: |
Y02E 20/16 20130101;
F02C 7/1435 20130101; F02C 7/04 20130101 |
Class at
Publication: |
415/180 |
International
Class: |
F01D 5/08 20060101
F01D005/08 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 31, 2009 |
JP |
2009-200696 |
Mar 15, 2010 |
JP |
2010-056953 |
Claims
1. A gas-turbine inlet-air cooling system comprising: a spray
device configured to spray cooling water into inlet air entered
into a compressor of a gas turbine facility to thereby cool the
inlet air; and a cooling-water feed system configured to feed the
cooling water to the spray device, the cooling-water feed system
comprising: at least one tank configured to reserve the cooling
water; a plurality of pipes connected to the tank independently of
each other and configured to feed the cooling water to the spray
device; and pumps installed for the pipes, respectively.
2. The gas-turbine inlet-air cooling system according to claim 1,
wherein the tank is installed in a number equal to a number of the
pipes and each of the pipes is connected to one tank.
3. The gas-turbine inlet-air cooling system according to claim 1,
wherein each of the pipes includes a suction side portion and a
discharge side portion connected to each of the pumps, and the
suction side portion and the discharge side portion of the pipe are
made of a material having a rigidity smaller than the other
portions of each pipe.
4. The gas-turbine inlet-air cooling system according claim 1,
further comprising unloader valves equipped on a discharge side of
the pumps and configured to come into operation when the respective
pumps are started or stopped, wherein the unloader valves are each
connected to the tank through outlet pipe.
5. The gas-turbine inlet-air cooling system according to claim 1,
further comprising pressure-regulator valves equipped on a
discharge side of the pumps, wherein the pressure-regulator valves
are each connected to the tank through outlet pipe.
6. The gas-turbine inlet-air cooling system according to claim 1,
further comprising accumulators installed on a discharge side of
each of the pumps.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is based upon and claims the benefit of
priority from Japanese Patent Application No, 2009-200696, filed
Aug. 31, 2009; and No, 2010-056953, filed Mar. 15, 2010; the entire
contents of all of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a gas-turbine inlet-air
cooling system which cools the inlet air of a gas turbine to
increase power output.
[0004] 2. Description of the Related Art
[0005] For a thermal power plant including a simple cycle gas
turbine facility or a combined-cycle plant which is made up of a
combination of a gas turbine facility, a steam turbine facility,
and an exhaust heat recovery boiler, for example, it is an
important object or challenge to increase power efficiency.
[0006] Conventionally, there is known an inlet-air cooling system
as means for increasing the power efficiency. The inlet-air cooling
system is a system for cooling the inlet air of a compressor to
thereby increase an inlet air mass flow rate of the compressor. The
inlet-air cooling system operates to spray water into inlet air to
thereby evaporate the water in an inlet system or the compressor
and then to cool the inlet air.
[0007] JP2002-322916A (Patent Document 1) discloses an inlet-air
cooling system which surely cools inlet air by reducing a size of
droplets sprayed into the inlet air to thereby increase power
output and prevent compressor blades from being damaged.
Specifically, the inlet-air cooling system disclosed in the Patent
Document 1 is equipped with a spray device composed of a plurality
of water distribution pipes and spray nozzles and a plurality of
cooling-water feed pipes connected to the spray device. In this
way, the inlet-air cooling system is designed to surely cool inlet
air with a larger amount of spray water and increase power
output.
[0008] In general, it is required for the inlet-air cooling system
to minimize the size of droplets sprayed into the air inlet system.
This is because with large droplet size, the water droplets
directly attack rotor and stator blades of the compressor, which
may cause erosion and damage the rotor and stator blades. In order
to achieve the object, there is provided a method of spraying
small-size droplets by using a positive displacement pump capable
of delivering cooling water at high pressure for an inlet-air
cooling system.
[0009] Then, it will be conceivable to apply the positive
displacement pump to a plurality of cooling-water feed pipes of the
inlet-air cooling system disclosed in the Patent Document 1.
However, there is such a fear that the positive displacement pump
might cause pressure pulsations in piping on the suction and
discharge sides. In particular, in an inlet-air cooling system in
which a positive displacement pump is installed for each of the
cooling-water feed pipes to properly control the droplets, the
pressure pulsations in the pipes may be increased by interfering
with each other, which may result in increasing mechanical
vibrations of surrounding equipment including the pumps and pipes
and hence damaging them.
SUMMARY OF THE INVENTION
[0010] The present invention has been made in consideration of the
circumstances mentioned above and an object thereof is to provide a
gas-turbine inlet-air cooling system capable of improving the
reliability of an entire system.
[0011] To achieve the above object, a gas-turbine inlet-air cooling
system of the present invention includes: a spray device configured
to spray cooling water into inlet air of a compressor of a gas
turbine facility to thereby cool the inlet air; and a cooling-water
feed system configured to feed the cooling water to the spray
device. The cooling-water feed system including: at least one tank
configured to reserve the cooling water; a plurality of pipes
connected to the tank independently of each other and configured to
feed the cooling water to the spray device; and pumps installed for
the pipes, respectively.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In the accompanying drawings:
[0013] FIG. 1 is a schematic system diagram showing a first
embodiment of a gas-turbine inlet-air cooling system according to
the present invention;
[0014] FIG. 2 is a schematic system diagram showing a modification
of the first embodiment of the gas-turbine inlet-air cooling system
according to the present invention;
[0015] FIG. 3 is a schematic system diagram showing another
modification of the first embodiment of the gas-turbine inlet-air
cooling system according to the present invention;
[0016] FIG. 4 is a schematic system diagram showing a second
embodiment of the gas-turbine inlet-air cooling system according to
the present invention; and
[0017] FIG. 5 is a schematic system diagram showing a third
embodiment of the gas-turbine inlet-air cooling system according to
the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0018] Each embodiment of a gas-turbine inlet-air cooling system
according to the present invention will be described hereunder with
reference to the accompanying drawings.
First Embodiment
[0019] FIG. 1 is a schematic system diagram representing a first
embodiment of a gas-turbine inlet-air cooling system according to
the present invention.
[0020] A gas turbine facility 1, to which the gas-turbine inlet-air
cooling system according to the first embodiment is applied, mainly
includes an air inlet system 3, a compressor 5, a gas turbine 6,
and a power generator 7, which are arranged along a fluid flow
direction in the described order.
[0021] The air inlet system 3 is connected to the compressor 5 and
to take inlet air entered into the compressor 5 from an air inlet
4. Although a description here is made on a case where gas entered
into the compressor 5 is air, the gas entered into the compressor 5
can be another gas.
[0022] The compressor 5 compresses the air entered from the inlet
system 3 and discharges the compressed air to a combustor 8. The
discharged compressed air is then supplied together with fuel 9 to
the combustor 8, thus generating combustion gas. The gas turbine 6
is driven by the combustion gas generated by the combustor 8, and
an exhaust gas 10 from the gas turbine 6 is discharged to the
atmosphere. The power generator 7 is coupled to a turbine shaft of
the gas turbine 6, and when the gas turbine is driven, the power
generator 7 generates electricity.
[0023] The gas turbine facility 1 includes a thermometer, a
hygrometer and an inlet air flow meter, which are not shown,
installed at specified locations. For example, the thermometer
measures atmospheric temperature, the hygrometer measures humidity
in the inlet system 3, and the inlet air flow meter measures a mass
flow rate of the air entered into the compressor 5.
[0024] The inlet system 3 includes a spray device 11 which sprays
cooling water into the inlet air at the inlet system 3 (and then to
the compressor 5). The spray device 11 sprays cooling water to cool
the inlet air. The spray device 11 is designed to spray fine
droplets through spray nozzles 13a, 13b, . . . , 13n (hereinafter
referred to collectively as the spray nozzles 13 when there is no
need to distinguish individual spray nozzles) mounted to a
plurality of water distribution pipes 12a, 12b, . . . , 12n
(collectively, water distribution pipes 12). Although a description
here is made on a case where water droplets are sprayed into the
air entered into the compressor 5, can be another fluid.
[0025] The spray device 11 is connected to a cooling-water feed
system 20 which feeds the cooling water to the spray device 11. The
cooling-water feed system 20 includes one tank 22 and a plurality
of feed pipes 23a, 23b, . . . , 23n (collectively, feed pipes 23).
The tank 22 is open to the atmosphere and configured to reserve the
cooling water. The feed pipes 23 are connected to the tank 22
independently of each other and feed the cooling water to the spray
device. Furthermore, the feed pipes 23 are connected with pumps
28a, 28b, . . . , 28n (collectively, pumps 28), pressure-regulator
valves 29a, 29b, . . . , 29n (collectively, pressure-regulator
valves 29), and accumulators 31a, 31b, . . . , 31n (collectively,
accumulators 31), respectively.
[0026] The tank 22 reserves cooling water 21 supplied from a
demineralized water system or service-water system (neither is
shown). The tank 22 should preferably have a capacity corresponding
to a discharge quantity of the pumps 28 at a maximum discharge flow
rate for 2 minutes or more (e.g., 2 to 10 minutes). This is
preferred for supplying cooling water smoothly without mixing air
cavities into pumps 28 in operation.
[0027] The feed pipes 23 are, for example, steel pipes and are
arranged in two or more lines. Each of the feed pipes 23 includes a
suction-side feed pipe 24 (a suction side portion) and a
discharge-side feed pipes 25 (a discharge side portion) on a
suction side and a discharge side, respectively, of each pump 28.
The resultant suction-side feed pipes 24 including individual
suction-side feed pipes 24a, 24b, . . . , 24n of the feed pipes 23
are connected to the tank 22 independently of each other, and the
resultant discharge-side feed pipes 25 including individual
discharge-side feed pipes 25a, 25b, . . . , 25n--of the feed pipes
23 are respectively connected to water distribution pipes 12 based
on the number of lines of the feed pipes 23.
[0028] Positive displacement pumps capable of delivering cooling
water at a high pressure may be used as the pumps 28 to reduce size
of droplets sprayed from the spray device 11. The positive
displacement pump is designed to extrude a liquid from the suction
side to the discharge side through movement or variation of an
enclosed space between a casing and a movable parts assembled
within and in contact with the casing.
[0029] The pressure-regulator valve 29 may be a spring-loaded valve
which is designed to open when discharge pressure of the pump 28
reaches or exceeds a rated value. The pressure-regulator valves 29
are used to keep constant the discharge pressure of the pumps 28,
i.e., upstream pressure of the spray nozzles 13. The
pressure-regulator valves 29 are connected to the discharge-side
feed pipes 25. Outlet pipes 30a, 30b, . . . , 30n (collectively,
outlet pipes 30) at downstream of the pressure-regulator valves 29
are respectively connected to the tank 22 to thereby open to the
atmosphere.
[0030] The accumulators 31 (gas damper) are installed to damp
pressure pulsations resulting from operation of the pumps 28. The
accumulators 31 are mounted to the discharge-side feed pipes 25 or
discharge casings (not shown) of the pumps 28. Preferably, the
accumulators 31 are mounted as close as possible to the respective
pumps 28.
[0031] Now, an operation of the cooling-water feed system 20 and
spray device 11 included in the gas-turbine inlet-air cooling
system according to the first embodiment will be described.
[0032] The droplets from the spray nozzles 13 of the spray device
11 are sprayed into the air taken into the inlet system 3 from the
air inlet 4. The cooling-water feed system 20 feeds cooling water
from the tank 22 to the spray device 11 by the pumps 28. In so
doing, the cooling-water feed system 20 feeds the cooling water to
the spray device 11 after optimizing, for example, the flow rate of
the cooling water depending on the atmospheric temperature, the
humidity in the inlet system 3, and the inlet air mass flow rate of
the compressor 5, so as to feed the optimized of the cooling water
flow. The atmospheric temperature, humidity, and inlet air mass
flow rate are measured by the thermometer, the hygrometer, and the
inlet air flow meter described above.
[0033] The positive displacement pumps used as the pumps 28 are
liable to cause pressure pulsations in the suction and discharge
piping.
[0034] However, with the cooling-water feed system 20 according to
the first embodiment, the suction-side feed pipes 24 of the
plurality of feed pipes 23 connected with the pumps 28 are
connected to the tank 22 independently of each other and the
suction side of the pumps 28 is opened to the atmosphere via the
tank 22. This is effective to reduce mutual interference by
pressure pulsations occurring in respective suction-side feed pipes
24 at simultaneously operations of the plural pumps 28.
[0035] On the other hand, the accumulators 31 are mounted to the
discharge casings of the pumps 28 or the discharge-side feed pipes
25. This is effective to reduce pressure pulsations in the
discharge-side feed pipes 25 positioned on the discharge side of
the pumps 28.
[0036] The discharge-side feed pipes 25 of the pumps 28 are also
connected with the pressure-regulator valves 29. Each
pressure-regulator valve 29 reduces changes in the discharge
pressure of the pump 28 by an operation thereof when a pressure of
the discharge-side feed pipe 25 reaches or exceeds a rated value.
This reduces pressure pulsations in the discharge-side feed pipes
25. The outlet pipes 30 of the pressure-regulator valves 29 are
open to the atmosphere via the tank 22. The pressure-regulator
valves 29 can stabilize outlet pressure (back pressure) and thereby
stabilize operation. This enables proper pressure control of the
discharge-side feed pipes 25 as well. Incidentally, since the
outlet pipes 30 of the pressure-regulator valves 29 are connected
to the tank 22, an excess flow from the pressure-regulator valves
29 is returned to the tank 22 and reused as cooling water.
[0037] As the pressure-regulator valves 29 regulate the discharge
pressure of the pumps 28, the upstream pressure of the spray
nozzles 13 is also stabilized. Consequently, the droplets sprayed
from the spray device 11 can be securely finely, protecting rotor
and stator blades of the compressor 5 from erosion by the droplets
attack.
[0038] With the gas-turbine inlet-air cooling system according to
the first embodiment, even when plural pumps 28 are operated
simultaneously, pressure pulsations in the feed pipes 23 on the
suction and discharge sides of the pumps 28 can be reduced
properly. As the pressure pulsations are reduced, mechanical
vibrations of surrounding equipment including the pumps and pipes
can be reduced as well. This improves reliability of the entire
gas-turbine inlet-air cooling system which uses the plurality of
positive displacement pumps in the cooling-water feed system
20.
[0039] Incidentally, in the gas-turbine inlet-air cooling system
according to the first embodiment described above, the plural feed
pipes 23 connected with respective pumps 28 are connected to the
single tank 22 independently of each other. However, the plural
tanks 22 may be connected instead of the single tank.
[0040] FIG. 2 is a schematic system diagram showing a modification
of the first embodiment of the gas-turbine inlet-air cooling system
according to the present invention.
[0041] In the example shown in FIG. 2, plural tanks 32a, 32b, . . .
, 32n (collectively, tanks 32) are connected corresponding to the
number of feed pipes 23 of a cooling-water feed system 35 so that
each tank 32 is connected with one feed pipe 23. In this way, by
connecting one tank 32 with each feed pipe 23, it is possible to
prevent mutual interference by pressure pulsations in the feed
pipes 23 more properly.
[0042] The connection of one tank 32 for each feed pipe 23
increases flexibility of tank layout and thereby allows the tanks
32 to be connected at such locations that can reduce distances
between the pumps 28 and the tanks 32 in the feed pipes 23 as well
as reduce pump suction heads. Thus, the suction-side feed pipes 24
of the feed pipes 23 can be reduced in length, while the
suction-side feed pipes 24, when over increased in length, can
cause pressure pulsations.
[0043] Incidentally, in an example of the first embodiment
described above, the feed pipes 23 are equipped with respective
pressure-regulator valves 29 and accumulators 31. However, the
gas-turbine inlet-air cooling system requires only that the feed
pipes 23 are connected to the tank 22 independently of each other,
and the pressure-regulator valves 29 and accumulators 31 may be
installed on the feed pipes 23 only as required.
[0044] Also, in the gas-turbine inlet-air cooling system described
above, the spray device 11 is installed in the inlet system 3.
However, the spray device 11 can also be installed outside the
inlet system 3, so as to cool the inlet air in front of the air
inlet 4.
[0045] FIG. 3 is a schematic system diagram showing another
modification of the first embodiment of the gas-turbine inlet-air
cooling system according to the present invention.
[0046] Water feed pipes 112a, 112b, . . . , 112n (collectively,
water feed pipes 112) of the gas-turbine inlet-air cooling system
shown in FIG. 3 are placed in front of the air inlet 4 and along a
plane almost perpendicular to a inlet flow direction into the inlet
system 3. The feed pipes 112 are also placed along a side of the
air inlet 4 to cool the inlet air through the side of the air inlet
4 as well. The water feed pipes 112 are equipped with respective
spray nozzles 113a, 113b, . . . , 113n.
[0047] The installation of the spray device 111 outside the inlet
system 3 to cool the inlet air eliminates the construction work
such as drilling which would be required in the case of installing
the spray device 111 in the inlet system 3. Furthermore, a
construction schedule for the installation of the gas-turbine
inlet-air cooling system can be shortened.
[0048] Also, since the spray device 111 is placed outside an inlet
filter installed in the air inlet 4, erosion in the compressor 5
due to water droplets can be reduced.
Second Embodiment
[0049] FIG. 4 is a schematic system diagram showing a second
embodiment of the gas-turbine inlet-air cooling system according to
the present invention.
[0050] The gas-turbine inlet-air cooling system according to the
second embodiment differs from the first embodiment mainly in that
unloader valves 41a, 41b, . . . , 41n (collectively, unloader
valves 41) are connected to the respective feed pipes 23a, 23b, . .
. , 23n (feed pipes 23) of a cooling-water feed system 40. In the
second embodiment, the same components as those in the first
embodiment are denoted by the same reference numerals as the
corresponding components in the first embodiment, and respective
description thereof will be omitted. The cooling-water feed system
40 shown in FIG. 4 as an example is not equipped with the
pressure-regulator valves 29 and accumulators 31 illustrated in
FIG. 1, but these components may be equipped as required.
[0051] The unloader valves 41 come into operation when the
respective pumps 28a, 28b, . . . , 28n (pumps 28) are started or
stopped. The unloader valves 41 are pressure control valves which
operate the pump 28 under no-load conditions when the discharge
pressure of the pump 28 reaches a rated value. The unloader valves
41 are connected to the discharge-side feed pipes 25a, 25b, . . . ,
25n (discharge-side feed pipes 25) of the feed pipes 23. Also,
outlet pipes 42a, 42b, . . . , 42n (collectively, outlet pipes 42)
of the unloader valves 41 are respectively connected to the tank
22.
[0052] Now, an operation of the gas-turbine inlet-air cooling
system according to the second embodiment will be described,
particularly about around the cooling-water feed system 40.
[0053] When the pumps 28 are started in service of the gas-turbine
inlet-air cooling system 40, the unloader valves 41 are open.
Normally, when the pumps 28 are started rapidly, the pumps 28 are
over loaded. However, in the gas-turbine inlet-air cooling system
according to the second embodiment, the unloader valves 41 are
connected with the discharge side of the pumps 28. This reduces the
loads on the pumps 28. Also, since the pumps 28 can be operated
under no load on start running-in and system air-bleeding can be
carried out. Consequently, the cooling-water feed system 40 can
properly prevent unexpected fluid vibrations due to air
contaminant.
[0054] When the pumps 28 operate under a rated condition, the
unloader valves 41 are closed and the discharge pressure of the
pumps 28 rises.
[0055] On the other hand, when the pumps 28 in a rated operation
are changed to a stop, the unloader valves 41 are opened. When
stopped rapidly, the pumps 28 are over loaded as in the case of a
rapid start. However, by operating the unloader valves 41, the
pumps 28 can be stopped under no-load conditions. Consequently, the
pumps 28 are not stopped rapidly, and the loads on the pumps 28 can
be reduced. Since the outlet pipes 42 of the unloader valves 41 are
connected to the tank 22, the cooling water through the unloader
valves 41 is returned to the tank 22 again. This is advantageous in
that the cooling water through the unloader valves 41 can be
reused, allowing operating costs to be reduced.
[0056] In addition to the advantages of the first embodiment, the
gas-turbine inlet-air cooling system according to the second
embodiment provides the advantage of being able to reduce the loads
on the pumps 28 during start and stop. This improves reliability of
the entire gas-turbine inlet-air cooling system including start-up
and shut-down.
Third Embodiment
[0057] FIG. 5 is a schematic system diagram showing a third
embodiment of the gas-turbine inlet-air cooling system according to
the present invention.
[0058] The gas-turbine inlet-air cooling system according to the
third embodiment differs from the first embodiment mainly in that a
part of feed pipes 53a, 53b, . . . , 53n (collectively, feed pipes
53) in a cooling-water feed system 50 is made of a non-metallic
material. The rest of the configuration is almost the same as the
first embodiment, and thus the same components as those in the
first embodiment are denoted by the same reference numerals as the
corresponding components in the first embodiment and respective
description thereof will be omitted. The cooling-water feed system
50 shown in FIG. 5 as an example is not equipped with the
pressure-regulator valves 29 and accumulators 31 illustrated in
FIG. 1 and the unloader valves 41 illustrated in FIG. 4, but these
components may be installed as required.
[0059] The suction-side feed pipes 54a, 54b, . . . , 54n
(collectively, suction-side feed pipes 54) of the feed pipes 53
partially include suction-side hoses 64a, 64b, . . . , 64n
(collectively, suction-side hoses 64) made of a non-metallic
material. Discharge-side feed pipes 55a, 55b, . . . , 55n
(collectively, discharge-side feed pipes 55) of the feed pipes 53
partially include discharge-side hoses 65a, 65b, . . . , 65n
(collectively, discharge-side hoses 65) made of a non-metallic
material.
[0060] The suction-side hoses 64 and discharge-side hoses 65 are
made of a non-metallic material, such as rubber or plastics, lower
in rigidity than the feed pipes 53. Also, the discharge-side hoses
65 are hydraulic hoses which can resist the discharge pressure of
the pumps 28.
[0061] Now, an operation of the gas-turbine inlet-air cooling
system according to the third embodiment will be described,
particularly about the cooling-water feed system 50.
[0062] The suction-side feed pipes 54 connected to the suction side
of the pumps 28 partially include the suction-side hoses 64. The
suction-side hoses 64 are lower in rigidity than the suction-side
feed pipes 54 and function as dampers against pressure pulsations
in the suction-side feed pipes 54 on the suction side of the pumps
28. This is effective to reduce the pressure pulsations on the
suction side of the pumps 28 and prevent mechanical vibrations from
being transmitted to surrounding equipment.
[0063] Similarly, the discharge-side feed pipes 55 partially
include the discharge-side hoses 65. This is effective to reduce
pressure pulsations on the discharge side of the pumps 28 and
prevent mechanical vibrations from being transmitted to surrounding
equipment.
[0064] In addition to the advantages of the first embodiment, the
gas-turbine inlet-air cooling system according to the third
embodiment provides the advantage of being able to more properly
reduce pressure pulsations in the feed pipes 53. This is effective
to prevent mechanical vibrations of surrounding equipment and
thereby improves reliability of the entire gas-turbine inlet-air
cooling system.
[0065] The features described above are focused on characteristic
features of the first to third embodiments, separately, and the
features of the first to third embodiments can be used in
combination as required. In particular, the example of arrangement
in which the spray device 111 is installed outside the inlet system
3 as illustrated in FIG. 3 can be applied also to the gas-turbine
inlet-air cooling systems according to the second and third
embodiments.
* * * * *