Patent ID: 6530208
Filing Date: 2003-03-11
Classification: F01K,F02C,F05D,Y02E,Y02P

Abstract:
A steam cooled gas turbine system comprising:a steam turbine including: a high pressure turbine; an intermediate pressure turbine; and a low pressure turbine; a condenser for condensing exhaust steam from said low pressure turbine of said steam turbine to produce water; a gas turbine including: a compressor for compressing air; a combustor for combusting fuel with the compressed air from said compressor to produce a high temperature combustion gas; and a turbine for expanding the high temperature combustion gas from said combustor so as to drive a generator, said turbine including a moving blade; a cooling steam system for cooling said combustor and said moving blade of said turbine, said cooling steam system including a heat exchanger; and a waste heat recovery boiler for receiving exhaust gas from said gas turbine to heat and vaporize the water from said condenser so as to generate steam to be supplied to said high pressure turbine, said intermediate pressure turbine, and said low pressure turbine, said waste heat recovery boiler including: a feed water heater; an intermediate pressure economizer; a first high pressure economizer; a second high pressure economizer; a low pressure superheater; an intermediate pressure superheater; a high pressure superheater; a high pressure evaporator; and a reheater; wherein said cooling steam system, said steam turbine, said gas turbine, and said waste heat recovery boiler are arranged such that outlet steam from said high pressure turbine flows through and is cooled by said heat exchanger of said cooling steam system, the cooled outlet steam from said heat exchanger then flows into said moving blade of said turbine to cool said moving blade, and the cooled outlet steam from said moving blade then flows into said reheater, and said cooling steam system and said waste heat recovery boiler are arranged such that a cooling water from said first high pressure economizer flows through said heat exchanger so as to be heated, and the heated water from said heat exchanger then flows into said high pressure evaporator.