To provide a circulating fluidized bed gasification reactor enabling to effectively use a deteriorated tar adsorptive substance in a fluidized bed gasification furnace with a simple method without easily disposing of the tar adsorptive substance.
In the circulating fluidized bed gasification reactor configured such that a raw material is gasified in a fluidized bed gasification furnace into which a fluid medium is introduced, char generated during gasification and the fluid medium are introduced into a fluidized bed combustion furnace of a latter part to burn an unburned component and the reheated fluid medium is circulated in a reactor furnace, a thermal decomposition furnace having a two-stage structure vertically having a tar absorption furnace and a fuel thermal decomposition furnace is provided in a prior stage of the fluidized bed gasification furnace, so that the fluid medium taken out from the fuel thermal decomposition furnace of a lower stage and containing unburned char and a fluid medium taken out from the tar absorption furnace of an upper stage and adsorbing tar can be respectively independently circulated, and a communicating path connecting to a side surface of the tar absorption furnace and a side surface of the fuel thermal decomposition furnace is provided so that the fluid medium adsorbing tar in the tar absorption furnace of the upper stage can be supplied to the fuel thermal decomposition furnace of the lower stage when the deteriorated fluid medium is taken out from the fuel thermal decomposition furnace.
MATSUOKA KOICHI
SUZUKI ZENZO
