To minimize the fluctuation in pressure in a coal gasifying furnace even under the large fluctuation in load and improve the coal gasification efficiency by controlling the starting air feed to an oxygen producing device prior to the fuel feed control to a gas turbine combustor and the coal feed control to the coal gasifying furnace.
Coal 1 and oxygen or oxygen loaded air 6 are supplied to a coal gasifying furnace 310 and reacted therein, the generated coal gasified gas 7 mainly composed of hydrogen and carbon monoxide is dedusted 401 and desulfurized 402, the resulting purified gas is supplied to a combustor 512, and a gas turbine 530 is driven by the generated gas to generate a power. At this time, the compressed air from an air compressor 210 is cooled to fraction nitrogen and oxygen in the air by utilizing the difference in boiling point in an oxygen producing device 200, but the feed quantity of starting air to the oxygen producing device 200 is controlled, when the load is fluctuated, so as to satisfy the load instruction prior to the control of the fuel feed quantity to the gas turbine combustor 512 and the coal feed quantity to the coal gasifying furnace 310.
Sato, Yoshio
Koyama, Shuntaro
Morihara, Atsushi
Takahashi, Sadao
Tanaka, Shinji
Akiyama, Toru
Fukuhara, Hiroshi
Osawa, Akira
Katagiri, Yukinori
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