Multipurpose Thermal Power Plant System

Abstract

To provide a multipurpose thermal power plant system capable of capturing moisture and carbon dioxide in large quantities at a low cost from exhaust gas of an oxygen combustion boiler. To use an oxygen combustion boiler 1, an oxygen separator 6, a coal fuel feed apparatus 7, a steam turbine 2, a generator 3, denitrification equipment 10, a gas heat exchanger 11, a condensate cooler 12 for cooling exit gas of the gas heat exchanger with a condensate at an exit of a condenser which is a part of steam cycle water of the turbine, a dust collector 13, a desulfurizer 14, a cooling water-desalination apparatus 15, and a carbon dioxide liquefier 16, to utilize the characteristic that main components of exhaust gas of the oxygen combustion boiler 1 after combustion are carbon dioxide gas and steam, and to simultaneously capture moisture and carbon dioxide in the gas by cooling and compressing the exhaust gas. And to install a water feed system for utilizing the captured moisture as cycle water of a steam-water cycle of the steam turbine.

What is claimed is: 
     
         1 . A multipurpose thermal power plant system comprising an oxygen combustion boiler, a steam turbine driven by steam generated by the oxygen combustion boiler, a generator driven by the steam turbine, an oxygen separator for generating oxygen fed to the oxygen combustion boiler, a fuel feed apparatus for feeding fossil fuel composed of carbon, hydrogen, a small amount of sulfur, and nitrogen to the oxygen combustion boiler, a denitrification equipment for removing nitrogen oxides in the exhaust gas of the oxygen combustion boiler, a gas heat exchanger for performing heat exchange between the boiler exhaust gas and recirculation boiler exhaust gas including oxygen, a condensate cooler for cooling exhaust gas at an exit of the gas heat exchanger with a condensate of the steam turbine, a recirculation system for recirculating boiler exhaust gas at an exit of the condensate cooler to the oxygen combustion boiler, an oxygen injection system for feeding oxygen from the oxygen separator to the recirculation system, a dust collector for removing dust from the exhaust gas at the exit of the condensate cooler, a desulfurizer for removing sulfur in boiler exhaust gas from the dust collector, a cooling water-desalination apparatus for producing water by cooling boiler exhaust gas from the desulfurizer, a carbon dioxide liquefier for obtaining carbon dioxide by compressing boiler exhaust gas at an exit of the cooling water-desalination apparatus, a carbon dioxide storage tank for storing liquefied carbon dioxide obtained by the carbon dioxide liquefier, a fresh water tank for capturing water generated by the cooling water-desalination apparatus, and a water feed system for feeding water of the fresh water tank to the steam turbine system as steam cycle water of the steam turbine. 
     
     
         2 . A multipurpose thermal power plant system comprising an oxygen combustion boiler, a steam turbine driven by steam generated by the oxygen combustion boiler, a generator driven by the steam turbine, an oxygen separator for generating oxygen fed to the oxygen combustion boiler, a fuel feed apparatus for feeding fossil fuel like liquefied natural gas composed of carbon and hydrogen to the oxygen combustion boiler, a gas heat exchanger for performing heat exchange between the boiler exhaust gas and recirculation boiler exhaust gas including oxygen, a condensate cooler for cooling exhaust gas at an exit of the gas heat exchanger with a condensate of the steam turbine, a recirculation system for recirculating boiler exhaust gas at an exit of the condensate cooler to the oxygen combustion boiler, an oxygen injection system for feeding oxygen from the oxygen separator to the recirculation system, a cooling water-desalination apparatus for producing water by cooling boiler exhaust gas from the condensate cooler, a carbon dioxide liquefier for obtaining carbon dioxide by compressing boiler exhaust gas at an exit of the cooling water-desalination apparatus, a carbon dioxide storage tank for storing liquefied carbon dioxide obtained by the carbon dioxide liquefier, a fresh water tank for capturing water generated by the cooling water-desalination apparatus, and a water feed system for feeding water of the fresh water tank to the steam turbine system as steam cycle water of the steam turbine. 
     
     
         3 . A multipurpose thermal power plant system comprising an oxygen combustion boiler, a steam turbine driven by steam generated by the oxygen combustion boiler, a generator driven by the steam turbine, an oxygen separator for generating oxygen fed to the oxygen combustion boiler, a fuel feed apparatus for feeding hydrogen fuel to the oxygen combustion boiler, a gas heat exchanger for performing heat exchange between the boiler exhaust gas and recirculation boiler exhaust gas including oxygen, a condensate cooler for cooling exhaust gas at an exit of the gas heat exchanger with a condensate of the steam turbine, a recirculation system for recirculating boiler exhaust gas at an exit of the condensate cooler to the oxygen combustion boiler, an oxygen injection system for feeding oxygen from the oxygen separator to the recirculation system, a cooling water-desalination apparatus for producing water by cooling boiler exhaust gas from the condensate cooler, a fresh water tank for capturing water generated by the cooling water-desalination apparatus, and a water feed system for feeding water of the fresh water tank to the steam turbine system as steam cycle water of the steam turbine. 
     
     
         4 . A multipurpose thermal power plant system comprising an oxygen combustion boiler, a steam turbine driven by steam generated by the oxygen combustion boiler, a generator driven by the steam turbine, an oxygen separator for generating oxygen fed to the oxygen combustion boiler, a fuel feed apparatus for feeding fossil fuel composed of carbon to the oxygen combustion boiler, a gas heat exchanger for performing heat exchange between the boiler exhaust gas and recirculation boiler exhaust gas including oxygen, a condensate cooler for cooling exhaust gas at an exit of the gas heat exchanger with a condensate of the steam turbine, a recirculation system for recirculating boiler exhaust gas at an exit of the condensate cooler to the oxygen combustion boiler, an oxygen injection system for feeding oxygen from the oxygen separator to the recirculation system, a carbon dioxide liquefier for obtaining carbon dioxide by compressing boiler exhaust gas from the condensate cooler, and a carbon dioxide storage tank for storing liquefied carbon dioxide obtained by the carbon dioxide liquefier.