GAS TURBINE OPERATION METHOD AND OPERATION CONTROL DEVICE

摘要

In order to remove water accumulated in a cooling air system while preventing performance loss of the gas turbine, this method is for operating a gas turbine (200) provided with a cooling air system (300) which connects an intermediate stage or the exit of a compressor (201) to a turbine (203) to supply compressed air bled from the compressor (201) to the turbine (203), a TCA cooler [a heat exchanger] (303) which cools the compressed air midway in the cooling air system (300), and a drain water discharge valve (a first drain water discharge valve (402) and a second drain water discharge valve (403)) which is disposed downstream of the compressed air of the TCA cooler (303), wherein at least in a prescribed period after reaching rated speed in starting the gas turbine (200), the drain water discharge valve is set to an open state, and thereafter, the drain water discharge valve is set to a closed state.