Integrated coal gasification combined cycle power generation system

Abstract

Provided is an air-blown integrated coal gasification combined cycle power generation system equipped with a carbon-dioxide capturing device, in which the integrated coal gasification combined cycle power generation system eliminates the need for an air separator by obtaining a new carrier source that replaces nitrogen gas serving as a carrier gas for pressurizing and carrying pulverized coal and char. In an integrated coal gasification combined cycle power generation system that employs an air combustion method of using air as an oxidizing agent to generate coal gas in a gasification furnace and that supplies the coal gas to a gas turbine after separating and capturing carbon dioxide from the coal gas in a carbon-dioxide capturing device, a portion of the carbon dioxide separated and captured by the carbon-dioxide capturing device is used as a carrier gas for pulverized coal and char.

1 . An integrated coal gasification combined cycle power generation system that employs an air combustion method of using air as an oxidizing agent to generate coal gas in a gasification furnace and that supplies a fuel gas, which is obtained by separating and capturing carbon dioxide from the coal gas in a carbon-dioxide capturing device, to a gas turbine,
 wherein a portion of the carbon dioxide separated and captured by the carbon-dioxide capturing device is used as a carrier gas for pulverized coal and char.   
     
     
         2 . The integrated coal gasification combined cycle power generation system according to  claim 1 , wherein the portion of the carbon dioxide separated and captured by the carbon-dioxide capturing device is used by being mixed with a drying gas for coal. 
     
     
         3 . The integrated coal gasification combined cycle power generation system according to  claim 1 , wherein the carbon-dioxide capturing device is of a type that absorbs the carbon dioxide by using a multistage flash drum, and wherein high-pressure-stage outlet gas from the flash drum is used as the carrier gas.