| 摘要 |
PROBLEM TO BE SOLVED: To improve controllability by restraining temperature of heated fuel from being suddenly fluctuated in relation to a heat exchanger having high exchanging calorific value and having a little fluid to be heat-exchanged. SOLUTION: In this system, a system 103 for bypassing a heat exchanger 100 for fuel is arranged, and the fuel flow rate 121 of a fuel system 101 to be heated and the fuel temperature 23 obtained after fuel which has bypassed the heat exchanger 100 and fuel heated by the heat exchanger 100 are joined are detected. Normally, a signal of the heat-exchanged fuel temperature and a signal of the fuel flow rate are calculated in a fuel temperature controller 130 to control the valve opening of a feed water flow rate control valve 111. When a gas turbine is shut off, the feed water flow rate control valve 111 is closed to the minimum openingα% for T2 seconds, and a bypass flow rate control valve 113 is opened to the specified openingβ% for T1 seconds. After that, the bypass flow rate control valve 113 is controlled until the T2 seconds pass, finally, the feed water flow rate control valve 111 is controlled, and the fuel temperature 123 is controlled to a set value.
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