The invention relates to a
solid fuel decoupled
fluidized bed gasifying method and a gasifying apparatus. By physically separately performing
drying and pyrolyzing of fuel, gasification of
char, and
tar /
hydrocarbon reforming, the interactions between the separated chemical reactions and physical processes during
fluidized bed gasification can be utilized. Specifically, in a
fluidized bed reactor having two reaction chambers,
drying and pyrolyzing of fuel, gasification of
char, and
tar /
hydrocarbon reforming are performed, respectively, the reforming of
tar /
hydrocarbon is promoted through the
catalytic effect of the
char, and the evaporated fuel
moisture is provided to the char gasification and tar / hydrocarbon reforming as an effective reaction agent. Accordingly, the tar content in
product gas can be reduced, the use amount of external steam can be reduced, the
overall efficiency of gasification can be improved, and this technique can also be applied to the
processing of high water-containing fuel. This gasifying method not only can be applied to individual fluidized
bed gasification, but can contribute to the design of a
combustor that combusts unreacted char, and to advanced decoupled fluidized
bed gasification.