Patent ID: 7285144
Filing Date: 2007-10-23
Classification: C10J,C10K,F17C,Y02P

Abstract:
1. A gasification and combustion method using a gasification furnace having a furnace bottom located at a lower part thereof, a combustion furnace having a furnace bottom located at a lower part thereof, and a partition wall for separating said gasification furnace and said combustion furnace from each other, said gasification and combustion method comprising: ejecting a fluidizing gas from said furnace bottom of said gasification furnace so as to have a substantially low fluidizing velocity to form a weak fluidizing region in a fluidized bed of said gasification furnace adjacent to said partition wall; ejecting a fluidizing gas from said furnace bottom of said gasification furnace so as to have a substantially high fluidizing velocity to form an intense fluidizing region in said fluidized bed of said gasification furnace; supplying a combustible material containing an incombustible material to said weak fluidizing region of said gasification furnace; gasifying said combustible material in said gasification furnace to produce a produced gas and char; ejecting a fluidizing gas from said furnace bottom of said combustion furnace so as to have a substantially high fluidizing velocity to form an intense fluidizing region in a fluidized bed of said combustion furnace adjacent to said partition wall; introducing a fluidized medium containing said char from said gasification furnace into said combustion furnace through a lower opening provided in said partition wall; discharging said incombustible material through an incombustible material discharging port provided between said furnace bottom of said gasification furnace and said furnace bottom of said combustion furnace; ejecting a fluidizing gas from said furnace bottom of said combustion furnace so as to have a substantially low fluidizing velocity to form a weak fluidizing region in said fluidized bed of said combustion furnace; and combusting said char introduced in said combustion furnace.