System and method for operating a gas turbine electric power plant with bypass flow fueling operation to provide improved reliability and extended apparatus life
阅读：835发布：2023-09-16
专利汇可以提供System and method for operating a gas turbine electric power plant with bypass flow fueling operation to provide improved reliability and extended apparatus life专利检索，专利查询，专利分析的服务。并且A gas turbine electric power plant is provided with an industrial gas turbine which is operated by a computer control system. The gas turbine is provided with a liquid fuel system having a turbine driven pump which supplies fuel to turbine nozzles through a throttle valve. A bypass pump pressure regulator valve and a bypass pressure temperature limiter valve function together to provide stable fuel pressure operation and stable turbine inlet air temperature operation during ignition and other turbine operating periods. Such bypass means are operated substantially independently of the control system.，下面是System and method for operating a gas turbine electric power plant with bypass flow fueling operation to provide improved reliability and extended apparatus life专利的具体信息内容。
1. A gas turbine electric power plant comprising a gas turbine having compressor, combustion and turbine elements, a generator coupled to said gas turbine for drive power, a fuel system for supplying fuel to said gas turbine combustion element, said fuel system having at least a liquid fuel subsystem provided with a source of liquid fuel, a pump for pumping liquid fuel from said source to said combustion element, a throttle valve for regulating the flow of liquid fuel to said combustion element, a main flow path connecting said pump to said throttle valve and said throttle valve to said combustion element, a bypass flow path from said main flow path for controlling pump discharge pressure, means for mechanically determining a bypass flow of liquid fuel through said bypass flow path, and a control system including means for operating said liquid fuel subsystem to supply liquid fuel through said main flow path to said combustion element for turbine startup and plant loading operations, said fuel system operating means including means for regulating the pump discharge pressure, said mechanical flow determining means operating substantially independently of said control system to limit the pump discharge pressure during at least a part of the turbine operating time after initiation of ignition.
2. An electric power plAnt as set forth in claim 1 wherein said means for regulating the pump discharge pressure comprises second means, operably coupled to said liquid fuel system operating means, for mechanically determining a bypass flow of liquid fuel through said bypass flow path.
3. An electric power plant as set forth in claim 1 wherein said means for mechanically determining a bypass flow of liquid fuel through said bypass flow path comprises a valve in said bypass flow path.
4. An electric power plant as set forth in claim 3 wherein means are provided for actuating said valve to operate in either of two open positions.
5. An electric power plant as set forth in claim 4 and further including a gas fuel subsystem and wherein said valve is operated in the larger open position during gas fuel operation.
6. An electric power plant as set forth in claim 4 wherein said control system and said valve are arranged and operated such that said valve is the primary means for limiting pump discharge pressure during the turbine ignition period.
7. An electric power plant as set forth in claim 6 wherein said second means for mechanically determining a bypass flow of liquid fuel through said bypass flow path comprises a second valve in said bypass flow path.
8. An electric power plant as set forth in claim 7 wherein said control system and said first and second valves are arranged and operated such that said second valve is the primary means for controlling pump discharge pressure after the turbine ignition period and said first valve is a secondary means for limiting pump discharge pressure after ignition.
9. An electric power plant as set forth in claim 1 wherein said control system and said mechanical flow determining means are arranged and operated such that said mechanical flow determining means is the primary means for limiting pump discharge pressure during the turbine ignition period.
10. An electric power plant as set forth in claim 1 wherein said control system comprises a programmed digital computer and an analog subsystem.
11. Industrial gas turbine apparatus comprising a gas turbine having compressor combustion and turbine elements, a fuel system for supplying fuel to said gas turbine combustion element, said fuel system having at least a liquid fuel subsystem provided with a source of liquid fuel, a pump for pumping liquid fuel from said source to said combustion element, a throttle valve for regulating the flow of liquid fuel to said combustion element, a main flow path connecting said pump to said throttle valve and said throttle valve to said combustion element, a bypass flow path from said main flow path for controlling pump discharge pressure, means for determining a bypass flow of liquid fuel through said bypass flow path, and a control system including means for operating said liquid fuel subsystem to supply liquid fuel through said main flow path to said combustion element for turbine startup and loading operations, said fuel system operating means including means for regulating pump discharge pressure, said bypass flow determining means operating substantially independently of said control system to limit the pump discharge pressure during at least a part of the turbine operating time after initiation of ignition.
12. Industrial gas turbine apparatus as set forth in claim 11 wherein said bypass flow determining means comprises a valve in said bypass flow path.
13. Industrial gas turbine apparatus as set forth in claim 12 wherein means are provided for actuating said valve to operate in at least either of two open positions.
14. Industrial gas turbine apparatus as set forth in claim 13 wherein said valve is operated in the more open position prior to turbine ignition and in the less open position during and after ignition.
15. Industrial gas turbine apparatus as set forth in claim 12 wherein said valve is operated with a predetermined opening under idle and light load operating conditions.
16. Industrial gas turbine apparatus as set forth in Claim 11 wherein said means for regulating pump discharge pressure comprises second means, operably coupled to said fuel system operating means, for mechanically determining a bypass flow of liquid fuel through said bypass flow path.
17. Industrial gas turbine apparatus as set forth in claim 16 wherein said second means for mechanically determining a bypass flow of liquid fuel through said bypass flow path comprises a second valve in said bypass flow path.
18. Industrial gas turbine apparatus as set forth in claim 17 wherein said control system and said first and second valves are arranged and operated such that said second valve is the primary means for controlling pump discharge pressure after the turbine ignition period and said first valve is the primary means for limiting pump discharge pressure during the turbine ignition period and a secondary means for limiting pump discharge pressure after the ignition period.
19. Industrial gas turbine apparatus as set forth in claim 16 wherein said control system comprises a programmed digital computer and an analog subsystem.
20. Industrial gas turbine apparatus as set forth in claim 19 wherein said analog subsystem further comprises a control circuit responsive to outputs from said computer, said control circuit being coupled to said second valve for controlling or limiting fuel pressure in said liquid fuel subsystem.
21. Industrial gas turbine apparatus as set forth in claim 19 wherein said control system includes means for determining throttle valve position, said throttle valve determining means including a second control circuit in said analog subsystem for operating said throttle valve.
22. Industrial gas turbine apparatus as set forth in claim 14 wherein said valve is operated with a predetermined opening under idle and light load operating conditions.
23. Industrial gas turbine apparatus as set forth in claim 14 wherein said means for regulating pump discharge pressure comprises a second valve in said bypass flow path operably coupled to said fuel system operating means, and wherein said control system and said first and second valves are adapted such that said second valve is the primary means for controlling pump discharge pressure after turbine ignition, and said first valve is the primary means for limiting pump discharge pressure during the turbine ignition period, and a secondary means for limiting pump discharge pressure after ignition.
24. A control system for operating a gas turbine electric power plant including a gas turbine having compressor, combustion and turbine elements and a fuel system for supplying fuel to said combustion element, said fuel system having at least a liquid fuel subsystem provided with a source of liquid fuel, a pump for pumping liquid fuel from said source to said combustion element, a throttle valve for regulating the flow of liquid fuel to said combustion element, a main flow path connecting said pump to said throttle valve and said throttle valve to said combustion element, and a bypass flow path from said main flow path for limiting pump discharge pressure, said control system comprising means for mechanically determining a bypass flow of liquid fuel through said bypass flow path, means for operating said liquid fuel subsystem to supply liquid fuel through said main flow path to said combustion element for turbine startup and plant loading operation, said fuel system operating means including means for regulating pump discharge pressure, said mechanical flow determining means operating substantially independently of said control system to limit pump discharge pressure during at least a part of the turbine operating time after initiation of ignition.
25. a control system as set forth in claim 24 wherein said liquid fuel subsystem operating means includes a programmed digital computer and an analog subsystem.
26. A control system as set forth in claim 24 wherein said bypass flow determining means comprises a valve in said bypass flow path and means foR actuating said valve to operate in at least either of two open positions and wherein said valve is operated in the more open position prior to turbine ignition and in the less open position during and after ignition.
27. A control system as set forth in claim 26 wherein said liquid fuel subsystem operating means includes a programmed digital computer and an analog subsystem.
28. A control system as set forth in claim 27 wherein means are provided for sensing at least one predetermined plant condition so as to generate a computer output for triggering movement of said bypass valve from its larger position to its smaller position substantially as ignition is initiated.
29. A control system as set forth in claim 25 wherein said bypass flow determining means comprises a first valve in said bypass flow path and means for actuating said valve to operate in at least either of two open positions, said means for regulating pump discharge pressure comprising a second valve operably coupled to said fuel system operating means for mechanically determining a bypass flow fo liquid fuel through said bypass flow path, and wherein said control system and said first and second valves are arranged and operated such that said second valve is the primary means for controlling pump discharge pressure after the turbine ignition period and said first valve is the primary means for limiting pump discharge pressure during the turbine ignition period and a secondary means for limiting pump discharge pressure after the ignition period.
30. A control system as set forth in claim 25 wherein means are provided for operating said computer to determine the operating position of said first mechanical means over substantially all phases of gas turbine operation.
31. A control system as set forth in claim 25 wherein means are provided for operating said computer to determine the times for positioning said second mechanical means in either of two predetermined alternative open positions.
32. A control system as set forth in claim 25 wherein said pressure discharge regulating means includes a regulating valve in said bypass flow path and said control system further comprises a control circuit in said analog subsystem responsive to outputs from said computer, said control circuit coupled to said regulating valve for controlling fuel pressure in said liquid fuel subsystem during predetermined turbine operating time periods.
33. A control system as set forth in claim 32 wherein said control system further includes means for determining throttle valve position, said throttle valve determining means including a second control circuit in said analog subsystem for operating said throttle valve.
34. A fuel system for supplying fuel to an industrial gas turbine combustion element, said fuel system having at least a liquid fuel subsystem provided with a source of liquid fuel, a pump for pumping liquid fuel from said source to said combustion element, a throttle valve for regulating the flow of liquid fuel to said combustion element, a main flow path connecting said pump to said throttle valve and said throttle valve to said combustion element, a bypass flow path from said main path for controlling pump discharge pressure, means for mechanically determining a bypass flow of liquid fuel through said bypass flow path, and a control system including means for operating said liquid fuel subsystem to supply liquid fuel through said main flow path to said combustion element for turbine startup and loading operations, said fuel system operating means including means for regulating the pump discharge pressure, said mechanical flow determining means operating substantially independently of said control system to limit the pump discharge pressure during at least a part of the turbine operating time after initiation of ignition.
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