Thermal power generation system and operation method thereof, thermal power generation system modification method, steam turbine equipment used in thermal power generation system, carbon dioxide separation and recovery device, overheat reducer

摘要

More excess superheat energy of the extracted steam sent from the steam turbine to the reboiler is recovered in the water supply system of the steam turbine to improve efficiency. Boiler 1, steam turbine, condenser 20, water supply system 101 for sending the water condensed in condenser 20 to the boiler, and carbon dioxide separation and recovery device 200 for separating carbon dioxide from boiler exhaust gas generated in the boiler And the extraction steam supply system 102 for supplying the extraction steam extracted from the steam turbine to the reboiler 17 of the carbon dioxide separation and recovery device 200, and the extraction steam supply system 102, and are supplied to the reboiler 17. A thermal power generation system including an overheat reducer 14 for exchanging heat between extracted steam and feed water. According to the present system, the steam extracted from the steam turbine can be recovered in the heat cycle of the steam turbine without reducing the temperature and reducing the pressure by spraying, and the decrease in efficiency due to the extraction can be suppressed.