System and method for controlling gas turbine output via an exhaust damper
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01D-025/30
F02C-009/20
F01K-023/10
F02C-006/18
출원번호
US-0969051
(2015-12-15)
등록번호
US-10253652
(2019-04-09)
발명자
/ 주소
Mathai, George Vargese
Scipio, Alston Ilford
Jordan, Jr., Harold Lamar
Ekanayake, Sanji
Klosinski, Joseph Philip
출원인 / 주소
General Electric Company
대리인 / 주소
Wilson, Charlotte C.
인용정보
피인용 횟수 :
0인용 특허 :
13
초록▼
A system for controlling gas turbine output for a gas turbine power plant is disclosed herein. The power plant includes a gas turbine including a combustor downstream from a compressor, a turbine downstream from the combustor and an exhaust duct downstream from the outlet of the turbine. The exhaust
A system for controlling gas turbine output for a gas turbine power plant is disclosed herein. The power plant includes a gas turbine including a combustor downstream from a compressor, a turbine downstream from the combustor and an exhaust duct downstream from the outlet of the turbine. The exhaust duct receives exhaust gas from the turbine outlet. The system further includes an exhaust damper operably connected to a downstream end of the exhaust duct. The exhaust damper increases backpressure at the turbine outlet and restricts axial exit velocity of the exhaust gas exiting the turbine outlet when the exhaust damper is partially closed. A method for controlling gas turbine output is also provided herein.
대표청구항▼
1. A power plant, comprising: a gas turbine including a combustor downstream from a compressor, a turbine downstream from the combustor and an exhaust duct downstream from a turbine outlet, wherein the exhaust duct receives exhaust gas from the turbine outlet;an exhaust damper operably connected to
1. A power plant, comprising: a gas turbine including a combustor downstream from a compressor, a turbine downstream from the combustor and an exhaust duct downstream from a turbine outlet, wherein the exhaust duct receives exhaust gas from the turbine outlet;an exhaust damper operably connected to a downstream end of the exhaust duct;a heat recovery steam generator having an inlet portion connected to a downstream end of the exhaust damper; anda controller electronically coupled to the exhaust damper, wherein the controller is configured to generate a first signal during an operating period of peak demand which causes the exhaust damper to at least partially close, and wherein, when the exhaust damper is at least partially closed, the exhaust damper increases backpressure at the turbine outlet and restricts axial exit velocity of the exhaust gas exiting the turbine outlet;wherein the first signal is based on data received from a sensor electronically coupled to the controller, the sensor measuring at least one of an exhaust pressure at the turbine outlet, an exhaust exit velocity exiting the turbine outlet, a power output of the power plant, or a steam flow rate from the heat recovery steam generator. 2. The power plant as in claim 1, wherein the exhaust damper is a guillotine damper. 3. The power plant as in claim 1, wherein the exhaust damper is a louver damper. 4. The power plant as in claim 1, further comprising a pressure sensor electronically connected to the controller and located upstream from the exhaust damper and proximate to the turbine outlet; and wherein the controller is configured to generate a second signal which causes the exhaust damper to at least partially open or at least partially close based on an exhaust backpressure data signal provided by the pressure sensor. 5. The power plant as in claim 1, further comprising a flow velocity sensor electronically connected to the controller and located upstream from the exhaust damper and proximate to the turbine outlet; and wherein the controller is configured to generate a second signal which causes the exhaust damper to at least partially open or at least partially close based on an axial exit velocity data signal provided by the flow velocity sensor. 6. The power plant as in claim 1, further comprising a power generator coupled to the gas turbine and a power sensor coupled to the power generator, and wherein the controller is configured to generate a second signal which causes the exhaust damper to at least partially open or at least partially close based on a power output signal generated by the power sensor. 7. The power plant as in claim 1, wherein the controller is configured to generate a second signal which causes the exhaust damper to at least partially open or at least partially close based on a predefined axial exit velocity limit inputted or stored in the controller. 8. The power plant as in claim 7, wherein the predefined axial exit velocity limit is based on mechanical limitations of turbine rotor blades of one or more stages of turbine rotor blades within the turbine. 9. The power plant as in claim 7, wherein the predefined axial exit velocity limit is based on mechanical limitations of turbine rotor blades of the last stage of turbine rotor blades within the turbine proximate to the turbine outlet. 10. The power plant as in claim 1, further comprising: a first steam flow sensor positioned downstream from the heat recovery steam generator and electronically connected to the controller;a steam turbine fluidly coupled to the heat recovery steam generator;a second steam flow sensor positioned downstream from the steam turbine and electronically connected to the controller;wherein the controller is configured to generate a second signal which causes the exhaust damper to at least partially open or at least partially close based on a steam flow rate signal generated by the first steam flow sensor or the second steam flow sensor. 11. A method for controlling power plant output, comprising: selecting an operation mode for a gas turbine of a power plant via an input to a controller, the power plant comprising: a combustor downstream from a compressor; a turbine downstream from the combustor; an exhaust duct downstream from a turbine outlet, wherein the exhaust duct receives exhaust gas from the turbine outlet; an exhaust damper operably connected to a downstream end of the exhaust duct; a heat recovery steam generator having an inlet portion connected to a downstream end of the exhaust damper; and the controller electronically coupled to the exhaust damper; andadjusting exhaust backpressure at the turbine outlet of the gas turbine via the exhaust damper, wherein the controller generates a signal during an operating period of peak demand which causes the exhaust damper to at least partially close based on the operation mode selected:,wherein the signal is based on data received from a sensor electronically coupled to the controller, the sensor measuring at least one of an exhaust pressure at the turbine outlet, an exhaust exit velocity exiting the turbine outlet, a power output of the power plant, or a steam flow rate from the heat recovery steam generator. 12. The method as in claim 11, further comprising fully opening inlet guide vanes at an inlet of a compressor of the gas turbine and partially closing the exhaust damper to increase thermal energy output of the gas turbine. 13. The method as in claim 11, wherein adjusting exhaust backpressure at the outlet of the turbine comprises partially closing the exhaust damper via the controller to restrict axial exit velocity of the exhaust gas exiting the turbine outlet. 14. The method as in claim 11, further comprising monitoring axial exit velocity of the exhaust gas via a flow velocity sensor electronically coupled to the controller and upstream from the exhaust damper. 15. The method as in claim 14, further comprising at least partially closing the exhaust damper and increasing the exhaust backpressure when the axial exit velocity of the exhaust gas approaches a predefined axial exit velocity limit inputted or stored in the controller.
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이 특허에 인용된 특허 (13)
Martz Lyle F. (Verona PA) Plotnick Richard J. (Cherry Hill NJ), Combined cycle electric power plant and a heat recovery steam generator having improved boiler feed pump flow control.
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