RESIDUAL STEAM REMOVAL MECHANISM AND RESIDUAL STEAM REMOVAL METHOD FOR STEAM COOLING PIPING OF GAS TURBINE

摘要

A combustor 10 is furnished with steam cooling piping 11. Steam is flowed by the following route, steam supply piping 20→steam cooling piping 11→steam discharge piping 70, to cool the combustor 10 with steam. When a gas turbine is stopped, valves V73, V71, V51, etc. are closed to construct a closed piping line composed of the pipings 20, 11 and 70. Then, the valve V71 is opened for evacuation by a condenser 90. Then, the valve V71 is closed, and the valve V51 is opened to charge nitrogen into the pipings 20, 11, 70. Then, the valve V51 is closed. By this procedure, residual steam within the steam cooling piping 11 can be reliably removed, and replaced by nitrogen. Thus, during stoppage of the gas turbine, residual steam can be removed reliably and promptly.