Kabushiki Kaisha Toshiba

Sachio Shibuya

Asako Inomata

Shoko Ito

Akinori Koga

Yoshitaka Fukuyama

Fumio Ohtomo

Junji Ishii

Yuji Nakata

Hironobu Yamamoto

Yoichi Sugimori

Ryou Oda

Takehiro Isu

Chikako Oto

A combined cycle power plant generally comprises a gas turbine power facility, a heat recovery steam generator, a steam turbine power facility, and an existing boiler. The power generation plant further comprises a system for introducing steam, which is generated in the heat recovery steam generator and the existing boiler, to the steam turbine of the steam turbine power facility through steam lines, which extend from the existing boiler and heat recovery steam generator and are then joined together, and a system for causing a line, which is arranged on a downstream side of a condenser provided in the steam turbine power facility, to branch off into feedwater lines, and supplying condensed water condensed by the condenser into the heat recovery steam generator and the existing boiler.

Combined cycle power plant

A combined cycle power generation plant generally comprises a gas turbine plant, a steam turbine plant and an exhaust heat recovery boiler, which further includes a low temperature reheat steam system for supplying a turbine exhaust steam from a high pressure turbine of the steam turbine plant to a reheater of the exhaust heat recovery boiler, a cooling steam supply system which branches from the low temperature reheat steam system and supplies the turbine exhaust steam to the high temperature section as a cooling steam, an intermediate pressure superheater steam system which is connected to the cooling steam supply system and adapted to join a steam supplied from an intermediate pressure superheater of the exhaust heat recovery boiler together with the turbine exhaust steam, a reheat steam system connecting the reheater of the exhaust heat recovery boiler and the intermediate pressure turbine, a cooling steam recovery system which recovers a steam after cooling the gas turbine high temperature section to the reheat steam system, a bypass system which branches a superheat steam pipe connecting an outlet of a first high pressure superheater of the exhaust heat recovery boiler and an inlet of a second high pressure superheater thereof, and a main steam system which supplies a steam from the bypass system to the high pressure turbine.

Combined cycle power generation plant and operating method thereof

A combined cycle power plant comprises a gas turbine system and a steam cycle system having a steam turbine to be driven by the steam generated by the waste heat of the exhaust gas of the gas turbine system, wherein the steam from the steam cycle system flows through a gas turbine cooling system of the gas turbine to cool the gas turbine blades and other elements of the gas turbine system to be cooled and the waste heat of the gas turbine system is effectively collected. The gas turbine cooling system is supplied selectively with bleed air from the compressor of the gas turbine or the steam provided from another steam cycle system in order to ensure a sufficient coolant supply at the time of starting and stopping the plant and during the operation with a partial load.

Combined cycle power plant with gas turbine cooling system

A combined cycle power plant comprises a gas turbine system and a steam cycle system having a steam turbine to be driven by the steam generated by the waste heat of the exhaust gas of the gas turbine system, wherein the steam from the steam cycle system flows through a gas turbine cooling system of the gas turbine to cool the gas turbine blades and other elements of the gas turbine system to be cooled and the waste heat of the gas turbine system is effectively collected. The gas turbine cooling system has two or more than two cooling ducts formed in two or more than two elements of the gas turbine system to be cooled such as the gas turbine blades and the combustor of the gas turbine system so that steam is made to flow through the cooling ducts of these two or more than two elements to be cooled to effectively and maximally exploit the cooling potential and the waste heat collecting potential of the steam and hence improve the overall thermal efficiency of the plant.

A combined cycle power plant comprises a gas turbine system and a steam cycle system having a steam turbine to be driven by the steam generated by the waste heat of the exhaust gas of the gas turbine system, wherein the steam from the steam cycle system flows through a gas turbine cooling system of the gas turbine to cool the gas turbine blades and other elements of the gas turbine system to be cooled and the waste heat of the gas turbine system is effectively collected. The gas turbine cooling system has two or more than two coolooling ducts formed in two or more than two elements of the gas turbine system to be cooled such as the gas turbine blades and the combustor of the gas turbine system so that steam is made to flow through the cooling ducts of these two or more than two elements to be cooled to effectively and maximally exploit the cooling potential and the waste heat collecting potential of the steam and hence improve the overall thermal efficiency of the plant.

Growing community of inventors

Tokyo, Japan

Sachio Shibuya