| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling system for the high temperature part of a gas turbine in which a temporary deviation of a clearance between the rotary part and the stationary part of the turbine from a management range can be prevented by adjusting a cooling amount for the high temperature part of the gas turbine while promptly responding to variation of gas turbine output.SOLUTION: A cooling system 30 for the high temperature part of a gas turbine includes: a cooler 31 which cools a coolant used for cooling the high temperature part of a gas turbine 2 by a heat exchange with water supply to a waste heat recovery boiler 20; flow control valves (37, 39) for controlling the quantity of water to be supplied to the cooler 31; and a controller 50 in which the setting value of the supply quantity is calculated by adding a correction value which is determined in accordance with responsiveness of a cooling amount for the high temperature part of the gas turbine with respect to output of the gas turbine 2, to the target value of the supply quantity determined in accordance with the output of the gas turbine 2, and based on the setting value, the flow control valve (37, 39) is controlled. |
