Hitachi, Ltd.

Tetsuya Kosaka

Nobuyoshi Mishima

Takashi Sugiura

Osamu Matsuura

A thermal power plant includes a boiler for burning fossil fuel to generate steam, a steam turbine including a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine which are driven by steam generated in the boiler, an absorber for absorbing and capturing COcontained in boiler exhaust gas discharged from the boiler in an absorbing liquid, a desorber for circulating the absorbing liquid between the desorber and the absorber and separating COfrom the absorbing liquid that has absorbed CO, a reboiler for feeding a heating source for separating COfrom the absorbing liquid to the desorber, a steam pipe system for feeding steam taken out from the high-pressure turbine and the intermediate-pressure turbine to the reboiler, and a steam feed source switching device.

Thermal power plant, steam turbine and control method for a thermal power plant

A boiler apparatus is provided that generates a heat source capable of efficiently regenerating absorbing liquid while maintaining steam turbine efficiency to a maximum extent. The boiler apparatus includes: an economizerpreheating water serving as working fluid of a steam turbine system; an air preheaterinstalled downstream of the economizer; an evaporatorinstalled downstream of the economizer; an evaporator drumusing the water vapor from the evaporatorto generate saturated water vapor; a reboilerusing the saturated water vapor from the evaporator drumto evaporate the absorbing liquid from a regeneration tower; a steam bypass pipeconnected to a steam pipethrough which the saturated water vapor from the evaporator drumpasses; a steam escape valveinstalled in the steam bypass pipe; an exhaust gas bypass pipeconnected to an exhaust gas pipeconnecting the air preheaterwith an absorption tower; and a butterfly valveinstalled in the exhaust gas bypass pipe

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Hitachi, Japan

Tetsuya Kosaka