PURPOSE: To perform a sufficient oxidization and incineration of carbon monoxide and to restrict an amount of inclusion of carbon monoxide contained in combustion discharged gas by a method wherein a throat part having a substantial rectangular section is formed between a primary combustion chamber and a secondary combustion chamber.
CONSTITUTION: Items to be ignited fed from a dust feeding port 6 into a primary combustion chamber A are dropped into a fluidized bed material S fluidized with dispersion air injected from a dispersion air opening 3, super-heated, burned and the combustion gas is lifted up and directed toward a throat part 11. High speed secondary combustion air H1 is fed from a first secondary-air nozzle 12 until it reaches the throat part 11 so as to form a turbulence flow. Then, at the throat part 11, since secondary combustion air H2 is supplied uniformly from a nozzle hole 13d of a second secondary air nozzle 13 in a direction crossing with a combustion gas flow and in the longitudinal direction, almost of all the combustible items are burned. Accordingly, almost of carbon monoxide contained in the combustion gas is burned to become carbon dioxide and then it is discharged together with the discharged gas.
SANO JUNICHI
NAKAI SEIICHI
TAKAHASHI MASAMICHI
MATSUI TAKESHI
KAZAHAYA HIDEKI
