STEAM COOLED GAS TURBINE SYSTEM

摘要

Steam cooled gas turbine system is improved to enhance a gas turbine efficiency and a combined efficiency by effecting steam- cooling of a combustor transition piece and a turbine blade. In a combined cycle system comprising; a gas turbine (8) having a generator (1), a compressor (2), a combustor (3), a blade cooling air cooler (4), a fan (5) and a turbine (6); a steam turbine (29) having a high pressure turbine (21), an intermediate pressure turbine (22) and a low pressure turbine (23); and a waste heat recovery boiler (9), saturated water of a high pressure pump (27) is partially led into a heat exchanger (110) for cooling steam to be supplied into a moving blade (52) and a stationary blade (53). Also, outlet steam of the high pressure turbine (21) is led into the moving blade (52), the stationary blade (53) and the combustor transition piece (54) for cooling thereof and the steam is then supplied to wn inlet of the intermedial;e pressure turbine (22). Further, the outlet steam of the high pressure turbine (21) is led into the turbine (6) for cooling blades thereof and the steam used for cooling the stationary blade is supplied to the inlet of the intermediate pressure turbine (22) and the steam used for cooling the moving blade is supplied to a reheater (20). Thus, the efficiency is enhanced.