PURPOSE: A circulation fluidized bed boiler is provided to maximize the combustion efficiency by increasing a detention period of a fuel in a combustion furnace and improving the collecting efficiency in a cyclone. CONSTITUTION: Anthracite coal is divided into fine particles and coarse particles through a particle separator(2) positioned in a coal silo(1). Then, the fine particles are introduced into a pallet derived fuel manufacturing apparatus(10) and coarse particles are introduced into a fluidized bed combustion furnace(4) through a fuel feeding system(3). Ashes collected in a cyclone(5) are introduced into a combustion furnace(4) through a particle re-circulation system(6). The fine particles are exhausted out of the cyclone(5) and cooled at a rear heating section. Then, the fine particles are finally collected in a collecting equipment(8).
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