Patent ID: 6405537
Filing Date: 2002-06-18
Classification: F01K,Y02E

Abstract:
A single shaft combined cycle plant, comprising:a gas turbine; an exhaust heat recovery boiler for generating steam using exhaust heat discharged from the gas turbine; and a steam turbine driven by steam generated from the exhaust heat recovery boiler, rotors of the gas turbine and rotors of the steam turbine being coupled, and the steam turbine comprising: a high pressure turbine being supplied with and driven by high pressure steam generated at a superheater of the exhaust heat recovery boiler and a reheating turbine supplied with and driven by steam that passes through the high pressure turbine, and back to the exhaust heat recovery boiler where it is reheated by a reheater of the exhaust heat recovery boiler, wherein cooling steam is supplied to the high pressure turbine from the exhaust heat recovery boiler during a period from starting up of the gas turbine until ventilation of the steam turbine, the cooling steam outputted from the high pressure turbine is made to bypass the reheater from a path leading to the reheater of the exhaust heat recovery boiler and is introduced to a path from the reheater leading to the reheating turbine.