To prevent abnormality from occurring in a gas turbine by detecting abnormality of opening of a compressor outlet valve when operated with closing the compressor outlet valve and a high temperature gas valve and opening a compressor bypass valve during starting the gas turbine, and by tripping the gas turbine when the abnormality is detected.
A gas turbine for a pressurized fluid bed boiler (PFBC), during its starting, increases its speed up to a nominal rotation speed with a starting device in the condition that a compressor outlet valve 4 and a high temperature gas valve 5 are closed and a compressor bypass valve 6 is opened. After the speed rising, the turbine continues to operate at the nominal rotation speed until finishing of starting preparation of a furnace. During this, if the compressor outlet valve 4 is operated by any abnormality, a system in which delivering air in a compressor 1 flows into the furnace through the compressor outlet valve 4 is generated, delivery pressure of the compressor sharply decreases, and finally vibration occurs in the compressor 1 to damage the gas turbine. Therefore, when abnormality of the compressor outlet valve 4 is detected, the gas turbine is tripped to prevent its damage.
SATO SATORU
KANEDA HIDEAKI
HIROSE FUMIYUKI
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