Patent ID: 6604354
Filing Date: 2003-08-12
Classification: F01K,F02C,F05D,Y02E

Abstract:
A combined cycle power plant, comprising:a gas turbine power facility; a heat recovery steam generator into which an exhaust gas is introduced from the gas turbine power facility; a steam turbine power facility having a steam turbine mounted to a shaft different from a shaft on which the gas turbine power facility is mounted; an existing boiler for supplying steam to the steam turbine power facility; a system for introducing steam, which is generated in the heat recovery steam generator and the existing boiler, into the steam turbine of the steam turbine power facility through steam lines, which extend from the existing boiler and the heat recovery steam generator boilers and are then joined together; and a system for causing a line, which is arranged on a downstream side of a steam condenser provided in the steam turbine power facility, to branch off into feedwater lines, and supplying condensed water condensed by a condenser into the heat recovery steam generator and the existing boiler, wherein said steam lines extending from the heat recovery steam generator and the existing boiler to the steam turbine and the feedwater lines extending from a condenser pump of the condenser to the heat recovery steam generator and the existing boiler are provided with valves, respectively, to permit selection of any one of three operation patterns of: a simultaneous power generation operation of the gas turbine power facility and the steam turbine power facility utilizing the steam generated in the existing boiler and the heat recovery steam generator; a simultaneous power generation operation of the gas turbine power facility and the steam turbine power facility utilizing only the steam generated in the heat recovery steam generator, while stopping the operation of the existing boiler; and a single power generation operation of only the steam turbine power facility utilizing only the steam generated in the existing boiler, while stopping the operation of the gas turbine.