COMBINED POWER PLANT AND OPERATING METHOD OF THE SAME

A combined power generation system according to an aspect of the present invention comprises: a gas turbine which generates a rotational force by burning fuel; a waste heat recovery boiler which heats feedwater using combustion gas discharged from the gas turbine and has a high pressure part, a medi...

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Bibliographische Detailangaben
Hauptverfasser:	CHA SONG HUN, KANG SUNG GJU, BAK BYOUNG GU, HA HONG GEUN
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	AIR INTAKES FOR JET-PROPULSION PLANTS BLASTING COMBUSTION ENGINES CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS ENGINE PLANTS IN GENERAL ENGINE PLANTS NOT OTHERWISE PROVIDED FOR ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES GAS-TURBINE PLANTS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING METHODS OF STEAM GENERATION NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES STEAM ACCUMULATORS STEAM BOILERS STEAM ENGINE PLANTS STEAM ENGINES STEAM GENERATION WEAPONS
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Beschreibung
Zusammenfassung:	A combined power generation system according to an aspect of the present invention comprises: a gas turbine which generates a rotational force by burning fuel; a waste heat recovery boiler which heats feedwater using combustion gas discharged from the gas turbine and has a high pressure part, a medium pressure part, and a low pressure part having different pressure levels; a fuel preheater which heats the fuel supplied to the gas turbine and has a primary heating part and a secondary heating part; a high-pressure water supply pipe connected to the high pressure part to supply high pressure feedwater to the secondary heating part; a feedwater delivery pipe for connecting the secondary heating part and the primary heating part to supply the feedwater discharged from the secondary heating part to the primary heating part; a feedwater control pipe connected to the medium pressure part to supply medium pressure feedwater to the feedwater delivery pipe; and an intermediate control valve installed between the primary heating part and the secondary heating part to control the flow rate of the high pressure feedwater flowing into the secondary heating part and controlling the flow rate of the medium pressure feedwater according to the flow rate of the high pressure feedwater. The present invention can prevent the fuel from overheating. 본 발명의 일 측면에 따른 복합 발전 시스템은 연료를 연소하여 회전력을 발생시키는 가스 터빈, 상기 가스 터빈에서 배출되는 연소 가스를 이용하여 급수를 가열하며 압력 레벨이 서로 상이한 고압부, 중압부, 저압부를 갖는 배열회수 보일러, 상기 가스 터빈으로 공급되는 연료를 가열하며 1차 가열부와 2차 가열부를 갖는 연료 예열기, 상기 고압부와 연결되어 상기 2차 가열부에 고압 급수를 공급하는 고압 급수관, 상기 2차 가열부와 상기 1차 가열부를 연결하여 상기 2차 가열부에서 배출된 급수를 상기 1차 가열부로 공급하는 급수 전달관, 상기 중압부와 연결되어 상기 급수 전달관으로 중압 급수를 공급하는 급수 제어관, 및 상기 1차 가열부와 상기 2차 가열부 사이에 설치되어 상기 2차 가열부로 유입되는 고압 급수의 유량을 제어하며, 고압 급수의 유량에 따라 중압 급수의 유량을 제어하는 중간 제어 밸브를 포함할 수 있다.