Combined cycle power generation plant and cooling steam supply method thereof

摘要

A combined cycle power generation plant includes a gas turbine plant, a steam turbine plant operatively connected to the gas turbine plant, an exhaust gas heat recovery boiler for generating steam for driving the steam turbine plant by an exhaust gas of the gas turbine plant, an evaporator unit accommodated in the exhaust gas heat recovery boiler, the evaporator unit being divided into a first evaporator and a second evaporator, and a superheater provided for at least one of an intermediate portion between the first evaporator and the second evaporator and a portion on a downstream side of the second evaporator.