Carbon dioxide conversion device

Abstract

A CO2 conversion device of the embodiment includes: a CO2 supply unit supplying CO2; a CO2 electrolysis unit including a cathode chamber supplied with CO2 from the CO2 supply unit and reducing and converting CO2 into CO and an anode chamber oxidizing substances to be oxidized to produce oxides; a fuel supply unit supplying fuel; an oxygen combustion power generation unit to which O2—CO2-containing gas discharged from the anode chamber of the carbon dioxide electrolysis unit is supplied, the fuel is supplied from the fuel supply unit, and that combusts the O2—CO2-containing gas; a condenser cooling and condensing water vapor-CO2-containing gas discharged from the oxygen combustion power generation unit; and a gas-liquid separator separating a water-CO2 two-phase fluid discharged from the condenser into water and CO2.

What is claimed is: 
     
         1 . A carbon dioxide conversion device, comprising:
 a carbon dioxide supply unit that supplies carbon dioxide;   a carbon dioxide electrolysis unit that includes a cathode chamber where carbon dioxide is supplied from the carbon dioxide supply unit and reduces and converts the carbon dioxide into carbon monoxide and an anode chamber that oxidizes substances to be oxidized to produce oxides;   a fuel supply unit that supplies fuel;   an oxygen combustion power generation unit to which oxygen-carbon dioxide-containing gas discharged from the anode chamber of the carbon dioxide electrolysis unit is supplied, the fuel is supplied from the fuel supply unit, and that combusts the oxygen-carbon dioxide-containing gas;   a condenser that cools and condenses water vapor-carbon dioxide-containing gas discharged from the oxygen combustion power generation unit; and   a gas-liquid separator that separates a water-carbon dioxide two-phase fluid discharged from the condenser into water and carbon dioxide.   
     
     
         2 . The device according to  claim 1 , wherein
 the gas-liquid separator is configured to supply carbon dioxide separated from the water-carbon dioxide two-phase fluid to the cathode chamber of the carbon dioxide electrolysis unit.   
     
     
         3 . The device according to  claim 1 , wherein
 the gas-liquid separator is configured to supply at least some of the separated water to the anode chamber of the carbon dioxide electrolysis unit as part of an electrolytic solution.   
     
     
         4 . The device according to  claim 1 , wherein
 the oxygen combustion power generation unit includes a closed-cycle gas turbine, turbine combined cycle power generation, Graz cycle gas turbine, supercritical CO 2  turbine, or oxy-fuel combustion device.   
     
     
         5 . The device according to  claim 4 , wherein
 at least one of water and carbon dioxide produced by combustion and carbon dioxide in the oxygen-carbon dioxide-containing gas is supplied as a circulating medium for the oxygen combustion power generation unit.   
     
     
         6 . The device according to  claim 4 , wherein
 at least one of water and carbon dioxide discharged from the gas-liquid separator is supplied as a circulating medium for the oxygen combustion power generation unit.