| 摘要 |
A combined cycle 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. The combined cycle system has a gas turbine ( 8 ) having a generator ( 1 ), a compressor ( 2 ), a combustor ( 3 ), a blade cooling air cooler ( 4 ) 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 demineralizer ( 118 ) and a water sprayer ( 116 ) for cooling steam to be supplied into a moving blade ( 52 ). The steam, after being used for cooling, is recovered into a reheater ( 20 ). Outlet steam of the high pressure turbine ( 21 ) is led into a stationary blade ( 53 ) for cooling thereof and the steam is then recovered into an inlet of the intermediate pressure turbine ( 22 ). Also, steam of an intermediate pressure superheater ( 16 ) is led into a combustor transition piece ( 54 ) for cooling thereof and the steam is recovered into the inlet of the intermediate pressure turbine ( 22 ). Thus, moving blade cooling steam is reduced and the combined efficiency is enhanced.
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