| 摘要 |
<p>PURPOSE:To provide a combustion method of a fluidized bed combustion furnace which prevents the generation of imperfect combustion and a great deal of CO caused by the shortage of oxygen even when fuels are temporarily subjected to marked changes in terms of their quality and their supply quantity. CONSTITUTION:A part of the bottom of a fluidized bed combustion furnace comprises a slanted porous air diffusion plate 26 which slants at a degree of 10 and over. The rest of the lower part fluidized bed is an air diffusion pipe type fluidized bed portion 33 where an air diffusion pipe 4 is installed. A floating medium is filled up above these portions, thereby forming the air diffusion pipe type fluidized bed portion and the slanted porous air diffusion fluidized bed or a fixed layer portion. The floating medium and incombustibles are extracted out from a furnace bottom extraction pipe 17 and a specified grain sized-floating medium is supplied to and circulated in the slanted porous air diffusion plate from an in-layer medium throw hole 23 where city refuses are thrown in the slanted porous air diffusion plate. The air which amounts to 0.7 to 1.5 times the minimum fluidization gas quantity is supplied so as to heat, decompose and burn the city refuses mildly. The rest char is burned at the diffusion pipe fluidized bed portion by supplying air which amounts to 2 to 9 times of the minimum fluidization air quantity.</p> |
