Patent ID: 6367242
Filing Date: 2002-04-09
Classification: F02C,Y02E

Abstract:
A recovery type steam cooled gas turbine comprising:a gas turbine system having (1) a compressor, (2) a combustor, and (3) a gas turbine with a rotor, moving blades, and stationary blades; a recovery system for recovering waste heat of the gas turbine via a waste heat recovery boiler and for driving a steam turbine; a steam system for delivering a cooling steam from the recovery system to a passage system including (1) a passage through the combustor, (2) passages through some of the moving blades, (3) passages through some of the stationary blades, and (4) a passage through the rotor; medium feed means for feeding a medium through at least a portion of the passage system, while the portion is isolated from the steam system during at least one of (1) a starting operation of the gas turbine to warm the portion of the passage system, and (2) a stopping operation of the gas turbine to purge steam from the portion of the passage system; and a temperature adjuster that is operative during the starting operation to adjust a temperature of air flowing from the compressor to the portion of the passage system to conform with a temperature elevation of the moving blades.