A coal gasification combined power plant comprising CO2 separation and recovery equipment, comprising:
- a combined cycle plant including a steam turbine and a gas turbine;
- a coal gasifying plant that gasifies pulverized coal and provides the gasified coal as a fuel gas to a combustor of the gas turbine of the combined cycle plant;
- and
- CO2 separation and recovery equipment including a CO shift reactor into which a gas containing main components of CO and H2O discharged from the coal gasifying plant is introduced to convert the gas into CO2 and H2;
- wherein the CO2 separation and recovery equipment further includes an inlet valve provided on the coal gasifying plant side of the CO shift reactor, an outlet valve provided on an outlet side of the CO shift reactor, an extraction control valve that applies steam extracted from the steam turbine to a foregoing part of the inlet valve, a gas composition analyzer that senses a gas composition of the gas flowing into the CO shift reactor, and a shift reaction controller configured to control the inlet valve, the outlet valve, and the extraction control valve,
- wherein the shift reaction controller is programmed to control the extraction control valve based on a difference in molar amount of CO and H2O that is calculated from analysis results of the gas composition analyzer,
- wherein the shift reaction controller is programmed to control the inlet valve and the outlet valve of the CO shift reactor on the basis of a catalyst tank temperature of the CO shift reactor, including controlling the inlet valve and the outlet valve when energy determined on the basis of the catalyst tank temperature of the CO shift reactor is deviated from an upper limit energy or a lower limit energy,
- wherein the shift reaction controller is programmed to calculate a total amount of temperature energy necessary for a catalytic reaction in the CO shift reactor from the molar amount of CO that is calculated from the analysis results of the gas composition analyzer and temperature energy necessary for the catalytic reaction, and
- wherein the shift reaction controller is programmed to open the inlet valve to the CO shift reactor and simultaneously close the outlet valve when the energy determined on the basis of the catalyst tank temperature is lower than the total amount of the temperature energy necessary for the catalytic reaction, so that the CO shift reactor is in a pressurized state and the catalyst tank temperature is raised.