STEAM COOLING APPARATUS FOR GAS TURBINE

摘要

Disclosed is a steam cooling system for gas turbine combustors, in which steam valve 12 is opened and steam from boiler 4 is conducted, and thereby a combustor of gas turbine 1 is cooled, and steam recovery valve 11 is opened and this steam is returned to steam turbine 5. When the amount of steam at the combustor outlet decreases, the temperature of temperature sensor 3I increases, and when this exceeds a predetermined value, temperature regulating valve 30 is opened and steam from steam turbine 5 is extracted and is let into the cooling steam outlet side flow path 61 through a steam flow path. When the value of pressure sensor 24 reaches a predetermined value, bypass valve 14 is opened and steam is caused to flow to condensor 6, and the necessary amount of steam is maintained within the combustor. This is all controlled by means of controller 10, which constantly maintains the temperature of the cooling steam at predetermined values.