IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0556153
(2009-09-09)
|
등록번호 |
US-8490403
(2013-07-23)
|
발명자
/ 주소 |
- Zhang, Hua
- Erickson, Dean
- Ball, Jr., David Wesley
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
6 |
초록
▼
In a gas turbine power plant, pressurized fuel gas undergoes pressure reduction and gas expansion before being provided to a gas turbine. Condensations, which can damage the turbine, can form as the fuel gas cools when the fuel gas undergoes the pressure reduction and expansion. An electric startup
In a gas turbine power plant, pressurized fuel gas undergoes pressure reduction and gas expansion before being provided to a gas turbine. Condensations, which can damage the turbine, can form as the fuel gas cools when the fuel gas undergoes the pressure reduction and expansion. An electric startup heater is used to superheat the fuel gas to substantially prevent the condensations from forming. The electric startup heater includes band heaters wrapped externally to a fuel gas pipe to heat the fuel gas from outside in. Compared to conventional heaters which provide superheating through internal heating elements, the electric startup heater reduces costs and provides increased safety, flexibility, operational efficiency and ability to adapt to varying fuel gas characteristics.
대표청구항
▼
1. An electric startup heater for a gas turbine power plant, comprising: a fuel gas pipe structured to allow fuel gas to flow therethrough;one or more electric band heaters wrapped externally to and in contact with said fuel gas pipe, said one or more electric band heaters structured to superheat sa
1. An electric startup heater for a gas turbine power plant, comprising: a fuel gas pipe structured to allow fuel gas to flow therethrough;one or more electric band heaters wrapped externally to and in contact with said fuel gas pipe, said one or more electric band heaters structured to superheat said fuel gas flowing through said fuel gas pipe; andcontroller of red to determine whether said power plant is in a startup mode, and to control said heaters to superheat said fuel gas in said startup mode,wherein superheating is defined as elevating temperature of said fuel gas sufficiently so as to substantially prevent condensation from forming when said fuel gas undergoes expansion downstream of said fuel gas pipe. 2. The electric startup heater of claim 1, further comprising: one or more fins provided internally within said fuel gas pipe, said one or more fins structured to promote heat transfer of heat from said one or more band heaters to said fuel gas flowing through said fuel gas pipe. 3. The electric startup heater of claim 2, wherein said one or more fins extend substantially in a longitudinal direction of said fuel gas pipe. 4. The electric startup heater of claim 2, wherein said one or more fins are integrally formed with said fuel gas pipe. 5. The electric startup heater of claim 1, wherein said fuel gas pipe is free of active internal heating elements. 6. The electric startup heater of claim 1, wherein said fuel gas pipe includes one or more curves and/or one or more bends. 7. A gas turbine power plant, comprising: a fuel gas supply structured to supply fuel gas to a gas turbine;a gas fuel module located upstream of said gas turbine and downstream of said fuel gas supply, said gas fuel module structured to control delivery of said fuel gas from said fuel gas supply to said gas turbine; andan electric startup heater located downstream of said fuel gas supply and upstream of said gas fuel module,wherein said electric startup heater comprises: a fuel gas pipe structured to allow said fuel gas from said fuel gas supply to flow therethrough towards said gas fuel module;one or more electric band heaters wrapped externally to and in contact with said fuel gas pipe, said one or more electric band heaters structured to superheat said fuel gas flowing through said fuel gas pipe; anda controller configured to determine whether said power plant is in a startup mode, and to control said heaters to superheat said fuel gas in said startup mode, andwherein superheating is defined as elevating temperature of said fuel gas upstream of said gas fuel module sufficiently so as to substantially prevent condensation from forming when said fuel gas undergoes expansion as said fuel gas flows through said gas fuel module. 8. The gas turbine power plant of claim 7, wherein said electric startup heater is located immediately upstream of said gas fuel module. 9. The gas turbine power plant of claim 8, wherein said electric startup heater is co-located inside a power plant building in which said gas turbine and said gas fuel module are located. 10. The gas turbine power plant of claim 7, wherein said electric startup heater further comprises: one or more fins provided internally within said fuel gas pipe, said one or more fins structured to promote heat transfer of heat from said one or more band heaters to said fuel gas flowing through said fuel gas pipe. 11. The gas turbine power plant of claim 7, wherein no valves and fixtures are provided to isolate said fuel gas pipe of said electric startup heater. 12. The gas turbine power plant of claim 7, further comprising: a performance heater located downstream of said fuel gas supply and upstream of said electric startup heater, said performance heater structured to superheat said fuel gas flowing therethrough. 13. The gas turbine power plant of claim 12, wherein said performance heater is structured to superheat said fuel gas during normal operation of said power plant. 14. The gas turbine power plant of claim 13, wherein said electric startup heater is structured to provide additional heat to said fuel gas during said normal operation of said power plant. 15. The gas turbine power plant of claim 14, wherein said controller is configured to control said electric startup heater so as to control said additional heat provided based on any combination of fuel gas type, fuel gas composition, fuel gas properties, amount of heat added by said performance heater, operational status of said performance heater, fuel gas flow rate, and fuel gas characteristics. 16. The gas turbine power plant of claim 7, wherein said fuel gas pipe of said electric startup heater includes one or more curves and/or one or more bends. 17. A method of operating a gas turbine power plant which comprises a gas fuel module located upstream of a gas turbine and an electric startup heater located downstream of a gas supply and immediately upstream of said gas fuel module, said electric startup heater comprising a fuel gas pipe and one or more electric band heaters wrapped externally to and in contact with said fuel gas pipe, said electric startup heater also being free of active heating elements internally within said fuel gas pipe, said method comprising: superheating, using said electric startup heater in a startup mode, fuel gas from said gas supply flowing through said fuel gas pipe so as to elevate temperature of said fuel gas sufficiently to substantially prevent condensation from forming when said fuel gas undergoes expansion as said fuel gas flows through said gas fuel module; andcontrolling, using said gas fuel module, a delivery of said superheated fuel gas from said electric startup heater to said gas turbine. 18. The method of operating said gas turbine power plant of claim 17, further comprising: providing, using said electric startup heater, supplemental heat to said fuel gas which has been superheated by a performance heater located upstream of said electric startup heater when said superheat provided by said performance heater is insufficient to substantially prevent said condensation from forming. 19. The method of operating said gas turbine power plant of claim 18, wherein said electric startup heater performs said step of providing said supplemental heat when said power plant is in a normal operation mode. 20. The method of operating said gas turbine power plant of claim 18, wherein said step of providing said supplemental heat comprises: controlling, using said electric startup heater, said supplement heat provided based on any combination of fuel gas type, fuel gas composition, fuel gas properties, amount of heat added by said performance heater, operational status of said performance heater, fuel gas flow rate, and fuel gas characteristics.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.