Patent ID: 6389794
Filing Date: 2002-05-21
Classification: F01K,Y02E

Abstract:
A combined cycle system including a gas turbine, a steam turbine, and a heat recovery steam generator, wherein gas turbine exhaust gas is used in the heat recovery steam generator for generating steam for the steam turbine, said gas turbine exhaust gas flowing from an entry end to an exit end of the heat recovery steam generator, and wherein the system further comprises:a fuel gas saturator having an inlet for hot saturator water, an inlet for fuel gas, an outlet for saturated fuel gas, and a saturator water outlet; a saturator water heater; a flow path for flowing saturator water from said saturator water outlet to said saturator heater, said saturator heater being operatively coupled to a heat source in the heat recovery steam generator for heating saturator water conducted thereto, using said heat source, to produce hot saturator water; a flow path for flowing hot saturator water produced by the saturator heater to the hot saturator water inlet of the fuel gas saturator; a fuel superheater for heating said saturated fuel gas; a flow path for flowing saturated fuel gas from said saturated fuel gas outlet to said fuel superheater for heating said saturated fuel gas, to produce superheated, saturated fuel gas; and a flow path for flowing said superheated, saturated fuel gas to said gas turbine.