Patent ID: 6109019
Filing Date: 2000-08-29
Classification: F01K,F05B,Y02E

Abstract:
In a steam cooled gas turbine system in a combined power plant which comprises a combination of a gas turbine plant and a steam turbine plant including a plurality of turbines having different pressure inputs, and includes an exhaust heat recovery boiler for generating steam turbine driving steam by utilizing exhaust heat from a gas turbine of the gas turbine plant, the improvement comprising:means for supplying generated steam from the exhaust heat recovery boiler as cooling steam for an exhaust pipe of a combustor;means for recovering the cooling steam applied to the exhaust pipe and applying the recovered steam to the steam turbine plant; andmeans for cooling the blades of the gas turbine by the use of steam bled from the outlet of a high pressure turbine of the steam turbine plant, and recovering the cooling steam, which has become hot after cooling, into an area of the reheater of the exhaust heat recovery boiler.