U.S. patent application number 14/236368 was filed with the patent office on 2014-09-04 for push rod arrangement for turbine system.
This patent application is currently assigned to SIEMENS AKTIENGESELLSCHAFT. The applicant listed for this patent is Varun Arora, Tejinder Singh Grewal, Abhimanyu Gupta, Suvadeep Sen, Anmol Sharma. Invention is credited to Varun Arora, Tejinder Singh Grewal, Abhimanyu Gupta, Suvadeep Sen, Anmol Sharma.
Application Number | 20140248131 14/236368 |
Document ID | / |
Family ID | 44993979 |
Filed Date | 2014-09-04 |
United States Patent
Application |
20140248131 |
Kind Code |
A1 |
Arora; Varun ; et
al. |
September 4, 2014 |
PUSH ROD ARRANGEMENT FOR TURBINE SYSTEM
Abstract
A turbine system with a push rod arrangement is presented. The
turbine system includes a first turbine having a first rotor, a
second turbine having a second rotor, a push rod coupled to a
casing of the first turbine at a first end and to a casing of the
second turbine at a second end wherein the push rod includes a
device for controlling temperature.
Inventors: |
Arora; Varun; (Gurgaon,
IN) ; Grewal; Tejinder Singh; (Gurgaon, IN) ;
Gupta; Abhimanyu; (Gurgaon, IN) ; Sen; Suvadeep;
(New Delhi, IN) ; Sharma; Anmol; (Gurgaon,
IN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Arora; Varun
Grewal; Tejinder Singh
Gupta; Abhimanyu
Sen; Suvadeep
Sharma; Anmol |
Gurgaon
Gurgaon
Gurgaon
New Delhi
Gurgaon |
|
IN
IN
IN
IN
IN |
|
|
Assignee: |
SIEMENS AKTIENGESELLSCHAFT
Munich
DE
|
Family ID: |
44993979 |
Appl. No.: |
14/236368 |
Filed: |
June 22, 2012 |
PCT Filed: |
June 22, 2012 |
PCT NO: |
PCT/EP2012/062058 |
371 Date: |
April 23, 2014 |
Current U.S.
Class: |
415/134 |
Current CPC
Class: |
F01D 25/28 20130101;
F01D 25/26 20130101; F05D 2300/5021 20130101 |
Class at
Publication: |
415/134 |
International
Class: |
F01D 25/28 20060101
F01D025/28 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 2, 2011 |
EP |
11176302.5 |
Claims
1. A turbine system comprising: a first turbine having a first
rotor, a second turbine having a second rotor, a push rod coupled
to a casing of the first turbine at a first end and to a casing of
the second turbine at a second end, wherein the push rod comprises
a device for controlling temperature, wherein the device comprises
a steam jacket for heating the push rod.
2. The turbine system according to claim 1, wherein the device
comprises an electrical component for heating the push rod.
3. The turbine system according to claim 1, wherein the push rod
comprises means for cooling.
4. The turbine system according to claim 3, wherein the means of
cooling comprises a through hole within the push rod.
5. The turbine system according to claim 4, wherein a coolant is
passed through the through hole for cooling.
6. The turbine system according to claim 5, wherein the coolant
comprises oil or steam.
7. The turbine system according to claim 4, further comprising one
or more valves for controlling the flow of coolant in the through
hole.
8. The turbine system according to claim 1, further comprising a
third turbine having a third rotor operatively coupled to the
second rotor or the first rotor.
9. The turbine system according to claim 1, further comprising a
measuring device for measuring the differential expansion in the
turbine system.
10. The turbine system according to claim 9, wherein the measuring
device is configured to provide a signal to the temperature
controlling device.
11. The turbine system according to claim 1, wherein the measuring
device is coupled to the third rotor distal to the second rotor or
the first rotor.
12. The turbine system according to claim 1, further comprising a
high pressure turbine disposed axially upstream the first
turbine.
13. A power generation system comprising a turbine system according
to claim 1.
14. The power generation system according to claim 13, wherein the
device for controlling temperature comprises an electrical
component for heating the push rod.
15. The power generation system according to claim 13, wherein the
device for controlling temperature comprises a steam jacket for
heating the push rod.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is the US National Stage of International
Application No. PCT/EP2012/062058 filed Jun. 22, 2012, and claims
the benefit thereof. The International Application claims the
benefit of European Application No. EP11176302 filed Aug. 2, 2011.
All of the applications are incorporated by reference herein in
their entirety.
FIELD OF INVENTION
[0002] The present invention relates to a turbine system for power
generation system and more particularly to a push rod arrangement
for the turbine system for use in a power generation system.
BACKGROUND OF INVENTION
[0003] A power generation system includes a turbine system such as
a steam turbine system which utilizes a condenser to condense
exhausted steam produced in a boiler to drive the turbine system;
this steam is turned into liquid water for recirculation through
the system. The turbine system includes a high pressure turbine, an
intermediate pressure turbine and a low pressure turbine. A
generator is coupled to the low pressure turbine via a drive shaft
to generate electricity.
[0004] During operation of the power generation system, the turbine
system is heated up. The casing and rotor of the turbine is
generally made of different material and expand differentially.
More particularly, the thermal expansion of the rotor is greater
than the casing of the turbine; therefore in a turbine system
thermal expansion of the intermediate pressure turbine rotor is
transferred to the low pressure turbine rotor. To compensate for
the expansion between the casing of the turbines and the rotors,
push rods are used between the casings of the intermediate pressure
turbine and the low pressure turbine.
[0005] However, there is still some differential expansion which
can not be compensated through the use of current push rod
mechanism resulting in accumulation of expansion at the end of the
turbine system, requiring significant amount of axial clearance in
the design of the turbine system.
[0006] Currently used push rods are rigid which do not allow
reduction of differential expansion in rotor trains with two or
three low pressure turbine configuration.
SUMMARY OF INVENTION
[0007] It is therefore an object of the present invention to
provide a push rod arrangement to compensate the differential
expansion between the rotor train and the casing for a
turbo-machine.
[0008] This object is achieved by providing a turbine system and a
power generation system as described herein.
[0009] The turbine system includes a first turbine having a first
rotor, a second turbine having a second rotor, a push rod coupled
to a casing of the first turbine at a first end and to a casing of
the second turbine at a second end characterized in that the push
rod comprises a device for controlling temperature. By having a
device for controlling the temperature of the push rod, the push
rod would be expanded when heated and contracted when cooled
thereby compensating for differential expansion in the turbine
system, wherein a steam jacket is used to heat the push rod. Steam
is passed into the jacket at about 300 degree centigrade resulting
in heating of the rod and resulting thermal expansion.
[0010] In one embodiment, an electrical component is used for
controlling the temperature and thereby the heating the push rod.
An electric current is passed to the push rod thereby causing
induction heating of the rod, which results in expansion of the
push rod.
[0011] According to one embodiment, the push rod includes means for
cooling to allow contraction of the push rod and also control the
expansion of the push rod.
[0012] In one embodiment, the means for cooling is a through hole
in the push rod; the through hole in the push rod allows coolant to
pass through the push rod thereby allowing cooling.
[0013] In another embodiment, the coolant includes oil or steam
from low pressure turbine exhaust steam. Oil is efficient absorber
of heat; also steam from low pressure turbine exhaust is at a
relatively low temperature and would allow cooling of the push
rod.
[0014] In one embodiment, one or more valves allow a desired amount
of coolant to pass through the through hole of the push rod
depending on the amount of expansion or contraction required in the
push rod.
[0015] In one embodiment, the turbine system includes a measuring
device for calculating the differential expansion of the push
rod.
[0016] In another embodiment, the measuring device is configured to
provide a signal to the temperature controlling device. The
measuring device based on the differential expansion provides a
signal to the temperature control device which then heats or cools
the push rod.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The above-mentioned and other features of the invention will
now be addressed with reference to the accompanying drawings of the
present invention. The illustrated embodiments are intended to
illustrate, but not limit the invention. The drawings contain the
following figures, in which like numbers refer to like parts,
throughout the description and drawings.
[0018] FIG. 1 is a schematic diagram of a power generation
system;
[0019] FIG. 2 is a schematic diagram of a turbine train;
[0020] FIG. 3 is a schematic diagram of a turbine with a
temperature controlled push rod;
[0021] FIG. 4 is a schematic diagram depicting the induction
heating of push rod, and
[0022] FIG. 5 is a schematic diagram of a turbine with push rod
having a steam jacket arrangement.
DETAILED DESCRIPTION OF INVENTION
[0023] FIG. 1 illustrates a schematic diagram of a power generation
system 1 in accordance with aspects of the present technique. The
power generation system 1 includes a turbine system 2 or a turbine
train including one or more turbines. The power generation system
further includes a condenser assembly 4, a feed pump 8 connected to
the condenser assembly 4, a boiler 10, a heat source assembly 12
and a generator 6 coupled to the turbine system 2.
[0024] The heat source assembly 12 such as a burner may include any
heat source such as, but not limited to a nuclear heat source or a
fossil fuel heat source which enables the power generation system 1
to function. The boiler 10 is coupled to the heat source which is
also in a flow communication with the turbine system 2.
[0025] The turbine system 2, which may also be referred to as the
turbine train may include one or more turbines in a serial flow
arrangement such as a high pressure turbine, an intermediate
pressure turbine and a low pressure turbine. The one or more
turbines are coupled in flow communication with each other. The
turbine system 2 is coupled in flow communication with the
condenser assembly 4 and operatively coupled to the generator 6 via
at least one drive shaft. The condenser assembly 4 is in flow
communication with the boiler 10, a feed pump 8 facilitates pumping
of condensate from condenser assembly 4 to the boiler 10. The heat
source assembly 12 heats a working fluid, such as water in the
boiler 10 to produce steam therein. The steam is directed into the
turbine system 2 for driving the turbines, which in turn actuate
the generator 6 to produce electricity.
[0026] FIG. 2 is a diagrammatical illustration of a turbine system,
such as the turbine system 2 of FIG. 1. In the presently
contemplated configuration, the turbine system 2 includes a high
pressure turbine 20, a first turbine 22 which is an intermediate
pressure turbine, a second turbine 24 and a third turbine 26. The
second turbine 24 and the third turbine 26 are two low pressure
turbines. The turbines are arranged in flow communication with each
other. More particularly, the turbines are in a serial flow
arrangement, wherein rotors of the turbines are operatively coupled
to each other.
[0027] In accordance with the aspects of the present technique, the
first turbine 22 includes a first rotor 28 operatively coupled to a
second rotor 32 of the second turbine 24. The second rotor 32 is
coupled to a third rotor 34 of the third turbine 26 as depicted in
FIG. 2.
[0028] Additionally, the third rotor 34 of the third turbine 26 is
coupled to the generator 6 via a drive shaft 29. The turbine system
2 also includes a high pressure turbine 20 disposed axially
upstream the first turbine 22. The high pressure turbine 20 and the
first turbine 22 are coupled to each other through a coupling. In
one embodiment, the coupling may in-elude a thrust bearing 30 which
is disposed between the first rotor 28 of the first turbine 22 and
a rotor of the high pressure turbine 20. The thrust bearing 30
prevents expansion of the first rotor 28 in a direction towards the
high pressure turbine 20. More particularly, the thrust bearing 30
is disposed at a second face (not shown in FIG. 2) of the first
rotor 28.
[0029] In accordance with aspects of the present technique, the
turbine system includes a measuring device 40 such as a
differential expansion (DE) meter coupled to the third turbine 26.
More particularly, in the presently contemplated configuration, the
DE meter is placed at a location proximal to the generator 6. It
may be noted that the DE meter is connected to an inner casing of
the third turbine 26. The DE motor is configured to provide a
signal as an output to a temperature controlling device of a push
rod (not shown in FIG. 2).
[0030] However, in other embodiments, one or more DE meters may be
present wherein each DE meter is coupled to each turbine to measure
the differential expansion at each turbine.
[0031] The temperature controlling device may be a heating system
for the push rod. It may be noted that heating in the push rod may
be induced electrically, such as, by passing an electric current to
heat the push rod. Alternatively, heating in the push rod may be
produced by passing heated substance such as a steam flow to
increase the temperature of the push rod as will be described with
reference to FIG. 3 and FIG. 4.
[0032] FIG. 3 is a schematic diagram depicting a section of a
turbine 50 in accordance with aspects of the present technique. A
push rod 54 is coupled to an inner casing 56 of the steam turbine
50 at a first end and to an outer casing 58 of the second turbine
(not shown) at the second end. The push rod 54 includes a device 52
for controlling temperature. The device 52 is an electric component
such as an electric current regulator for passing a desired amount
of current to the push rod 54. The current when passed through the
push rod via an inductor heats the push rod thus raising the
temperature of the push rod 54.
[0033] In the presently contemplated configuration, the push rod 54
includes means for cooling such as but not limited to a through
hole 60 which is used for cooling purposes. The through hole 60
extends along the length of the push rod 54. The through hole 60
allows a coolant to pass through it thereby reducing the
temperature of the push rod 54.
[0034] In accordance with aspects of the present technique, the
coolant may include material such as oil. Alternatively, steam from
the low pressure turbine exhaust steam may be used as a
coolant.
[0035] In one embodiment, an oil spray system may also be used as a
means for cooling the push rod.
[0036] The push rod 54 is heated to a temperature of about 300
degree centigrade which results in the expansion of push rod in the
range of about 8 to 9 mm. In case, a lesser expansion is needed the
cooling mechanism as described hereinabove may be used. It may be
noted that the flow of coolant in the through hole 60 may be
controlled through a use of valves (not shown in FIG. 3). The
measuring device 40 which is the DE meter measures the differential
expansion between the casing and the rotor of the turbine system.
The DE meter 40 provides a signal to the device 52 for controlling
temperature which is the electric current regulator to provide a
desired current to heat the push rod 54 accordingly.
[0037] FIG. 4 is a schematic diagram depicting the exemplary push
rod arrangement in accordance with aspects of the present
technique. The push rod 54 is coupled to an inner casing to the
first turbine 22 at a first end 66 and to the outer casing of the
second turbine 24 at a second end 68. The temperature controlling
device 52, which is an electric current regulator provides a
desired amount of current to heat the push rod 54, as illustrated
in FIG. 4. As previously noted the push rod 54 includes the through
hole 60 for allowing the coolant to pass through the push rod 54
for cooling purposes. One or more valves 64 control a flow 62 of
the coolant based on the desired amount of cooling required for the
push rod 54.
[0038] Referring to FIG. 5, a schematic diagram depicting a section
of a turbine 70 is depicted. The turbine 70 includes a push rod 54
with a device for controlling temperature. In the presently
contemplated configuration the device is a steam jacket 72
enclosing the push rod 54. Steam from the first turbine, such as,
the intermediate pressure turbine is used to heat the push rod 54.
Steam from the intermediate pressure turbine is at a temperature of
around 350 degree centigrade; such temperature is capable of
heating the push rod 54 and causing thermal expansion in the push
rod 54.
[0039] As previously mentioned, the push rod 54 includes the
through hole 60 for passing coolant for controlled contraction of
the push rod 54. The measuring device 40, such as DE meter is
connected to the steam jacket 72 which provides information on the
extent of expansion required in the push rod to compensate for the
differential expansion between the rotor and the casing of the
turbines in the turbine system. A steam mass flow may be regulated
based on the information from the measuring device 40.
[0040] Although, the embodiments of the present invention have been
described with respect to a turbine system, such as a steam turbine
system, it may be noted that similar technique and arrangement may
also be used for a gas turbine system. Particularly, the
embodiments described hereinabove are applicable for steam turbine
system as well as the gas turbine system.
* * * * *