RECYCLE UNIFORM DISTRIBUTING METHOD OF BURNT ASHES AT FLUIDIZED BED BOILER

摘要

PURPOSE:To be able to prevent the aggravation of burning balance caused by excess burning air by supplying ashes containing combustible in refuse scattered and captured at the burning time into a fluidized bed uniformly through a recycle box and T-shaped nozzles with fluidizing air. CONSTITUTION:Ashes containing combustible in refuse accompaning burnt exhaust gas are captured by a cyclone 23 and a bag filter 24 is passing through an exhaust duct 22 and transferred to a U-shaped valve etc. 26 with a conveyer 25. At the valve etc. 26, ashes are divided by a small amount of distributing air 'u' and the specified amount is supplied to a recycle box 16 through an ash supply duct 27. At the box 16 ashes containing combustible in refuse are uniformly distributed and supplied into the lower layer of a fluidized bed 15 through T-shaped nozzles 17 by fluidizing air 'a' introduced from opening holes 18. As for the air amount used at that time, ashes are able to be transferred sufficiently by the air amount supplied per the area of a distributing plate because particle diameters are as small as 0.1mm or less. Even if a recycle ratio having a large amount of supplied ashes is such a high recycle one as about 5, uniform distributing supply is possible.