FLUIDIZED BED INCINERATOR

PROBLEM TO BE SOLVED: To positively circulate a medium even if the size of an incinerator has been increased, and to increase the efficiency of heat recovery in the fluidized bed incinerator of city rubbish, industrial wastes, or the like. SOLUTION: A heat recovery chamber 3 with a heat transfer pipe 4 and a combustion chamber 2 without the heat transfer pipe 4 are composed by a bulkhead 5 in a fluidized bed incinerator 1, a scattering pipe 9 is installed immediately below the bulkhead 5, and scattering pipes 7 to 11 and scattering plates 12 to 14 are installed at the lower part of each chamber, thus adjusting the amount of FDF air. When air-column speed at a the heat-recovery-chamber side and that at a combustion-chamber side are set high and low, respectively, the density difference in a medium is generated, the medium is moved below the bulkhead from the chamber with high density to that with low one, the medium in the heat recovery chamber is overflowed to the combustion-chamber side from the bulkhead, flow for pushing into the lower part of the heat recovery chamber is created, and medium circulation flow is generated. The entire medium can be circulated by the scattering plates even in the large-sized fluidized bed incinerator. By controlling the amount of air from the scattering pipe 9 immediately below the bulkhead 5, the amount of circulation of the medium can be controlled.