Patent ID: 8621841

Claim:
A gasification power generation system provided with a carbon dioxide separation and recovery device comprising: the carbon dioxide separation and recovery device having: a shift reactor to convert carbon monoxide contained in fuel gas into carbon dioxide by mixing steam into the fuel gas containing carbon monoxide and hydrogen to cause a shift reaction; a carbon dioxide absorption tower to produce fuel gas from which carbon dioxide has been removed by allowing an absorption liquid to absorb carbon dioxide from the fuel gas containing carbon dioxide flowing down the shift reactor; and an absorption liquid recycling device to recycle the absorption liquid by separating carbon dioxide absorbed by the absorption liquid in the carbon dioxide absorption tower; and a gasification power generation system having: a gas turbine device driven by burning the fuel gas from which carbon dioxide has been removed in the carbon dioxide absorption tower of the carbon dioxide separation and recovery device in a combustor; an exhaust heat recovery boiler having a drum to generate steam by an exhaust gas discharged from the gas turbine device; and a steam turbine driven by the steam generated by the drum of the exhaust heat recovery boiler; wherein an evaporator to generate steam heated by heat exchange with the fuel gas heated by shift reaction heat generated in the shift reactor of the carbon dioxide separation and recovery device is disposed downstream of the shift reactor, a steam line to supply a steam mixer disposed in a fuel gas line upstream of the shift reactor with the heated steam generated by the evaporator is provided, and the heated steam supplied through the steam line is allowed to flow from the steam mixer into the shift reactor as shift steam together with the fuel gas.