Patent ID: 8864856

Claim:
A circulating fluidized bed gasification furnace for the purpose of enhancing gasification performance in the fluidized bed gasification furnace comprising: a combustion furnace configured to burn char to heat a circulating medium; a cyclone collector connected to the combustion furnace and configured to to collect a circulating medium in a combustion exhaust gas from the combustion furnace; a downcomer connected to the cyclone collector and configured to introduce the circulating medium collected from the cyclone collector; a fluidized bed gasification furnace configured to form a fluidized bed by the circulating medium from said downcomer, a gasification agent supplied from below and a raw material supplied from a raw material supply unit to a freeboard to gasify the raw material; and a circulation flow passage configured to return the circulating medium and unreacted char not gasified in the fluidized bed gasification furnace to said combustion furnace, wherein a sealer provided by a lower end of said downcomer has a tilted tube downwardly tilted and connected to the freeboard of said fluidized bed gasification furnace, and a vertical supply tube, having a lower end connected to said raw material supply unit, is connected to said tilted tube such that the raw material from said raw material supply unit is supplied to get into the fluidized bed together with the circulating medium from the downcomer.