OPERATION METHOD FOR EXTERNAL CIRCULATING FLUIDIZED BED INCINERATOR USED FOR INCINERATOR OF WASTES WITH HIGH MOISTURE CONTENT AND VOLATILE SUBSTANCE CONTENT SUCH AS SEWAGE SLUDGE

摘要

PROBLEM TO BE SOLVED: To provide an operation method for a compact and low cost type circulating fluidized bed incinerator capable of the combustion with a low degree of environmental pollution of sewage and sludge having a high moisture content and a high volatile substance content with high efficiency in the circulating fluidized incinerator.;SOLUTION: In a circulating fluidized incinerator forming a bubble fluidized bed from the primary air supplied from the lower side of the fluidized bed and introducing the secondary air to a splash area to reflux the particles conveyed with the particles blowing up outside the furnace by the secondary air through a freeboard to the bubble fluidized bed area through an external circulating part, the amount of the primary air is made to be 10 to 40%, by volume, of the total air amount in distributing the total supplied air amount into the primary air and secondary air. It is characterized by the primary air amount that is 0.15 to 0.5 times the theoretical amount of air required for the complete combustion of an object to be incinerated, and moreover the location at which the secondary air is blown into the bubble fluidized bed area has the height of 1.2 m or higher from a fluidized bed air dispersion plate. The fluid medium with the mean particle diameter of 0.5 mm or smaller is used.;COPYRIGHT: (C)2002,JPO