[특허]Combined cycle electric power plant and a heat recovery steam generator having improved boiler feed pump flow control

Combined cycle electric power plant and a heat recovery steam generator having improved boiler feed pump flow control 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F01K-023/10 F01K-013/02
출원번호	US-0495724 (1974-08-08)
발명자 / 주소	Martz Lyle F. (Verona PA) Plotnick Richard J. (Cherry Hill NJ)
출원인 / 주소	Westinghouse Electric Corporation (Pittsburgh PA 02)
인용정보	피인용 횟수 : 31 인용 특허 : 0

초록 ▼

A combined cycle electric power plant includes gas and steam turbines and a steam generator for recovering the heat in the exhaust gases exited from the gas turbine and for using the recovered heat to produce and supply steam to the steam turbine. The steam generator includes an economizer tube and a high pressure evaporator tube and a boiler feed pump for directing the heat exchange fluid serially through the aforementioned tubes. A condenser is associated with the steam turbine for converting the spent steam into condensate water to be supplied to a deaerator for removing undesired air and for preliminarily heating the water condensate before being pumped to the economizer tube. Condensate flow through the economizer tube is maintained substantially constant by maintaining the boiler feed pump at a predetermined, substantially constant rate. A bypass conduit is provided to feed back a portion of the flow heated in the economizer tube to the deaerator; the portion being equal to the difference between the constant flow through the economizer tube and the flow to be directed through the high pressure evaporator tube as required by the steam turbine for its present load.

대표청구항 ▼

A combined cycle electric power plant comprising: a. at least one gas turbine including an exit through which heated exhaust gases pass; b. means for generating steam at varying rates dependent upon the load placed upon said steam turbine, coupled to said gas turbine exit by transferring heat from the exhaust gases to a fluid passing through said steam generating means; c. a steam turbine coupled to said steam generating means and driven by the steam supplied thereby; d. means for generating electric power by the driving power of said turbines; e. condenser means for receiving and converting the spent steam from said steam turbine into condensate; f. means for controlling the operation of said turbines and said steam generating means; g. said steam generating means including first and second heat exchange tubes, each having an inlet and outlet, said outlet of said first heat exchange tube being coupled to said inlet of said second heat exchange tube, pump means for directing the condensate from said condenser serially through said first and second heat exchange tubes, the steam derived from said second heat exchange tubes being supplied to drive said steam turbine, a recirculation conduit coupled between the outlet of said first heat exchange tube and its inlet, and a recirculation control valve inserted within said recirculation conduit and selectively controlled to permit a variable recirculation flow to said inlet of said first heat exchange tube; and h. said controlling means comprising pump control means for actuating said pump to establish fluid flow through said first heat exchange tube at a substantially constant rate set for all loads imposed upon said steam turbine to achieve an optimum heat transfer between the exhaust gases and the fluid directed through said steam generating means to provide sufficient steam to said steam turbine at maximum load, and valve control means for controlling said valve to permit a variable, first flow through said recirculation conduit proportional to the difference between the constant flow established by said pump through said first heat exchange tube and a second flow to said second heat exchange tube, the second flow being set in accordance with the load imposed upon said steam turbine.

이 특허를 인용한 특허 (31)

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Combined cycle electric power plant and a heat recovery steam generator having improved boiler feed pump flow control 원문보기

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Combined cycle electric power plant and a heat recovery steam generator having improved boiler feed pump flow control 원문보기

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