Enclosed multi-chamber fluidized bed drying method for sludge

Abstract

A closed multi-room fluidized bed sludge drying method is provided, which is a sludge drying method having the advantages of simple equipment structure, convenient operation, strong sludge adaptability, high thermal efficiency, safety, continuity, stability, etc. After the mechanically dewatered sludge is mixed with the back-mixed sludge, the mixture is dried room by room in an inert particles multi-room fluidized bed dryer (3). The first room and the second room of the inert particles multi-room fluidized bed dryer (3) adopt inert particles (f) as heat storage medium. Gas from a cyclone separator (5) goes through a spray tower (7) and returns into an air heating unit (4) through a circulating fan (10). Part of dried sludge (e) at the lower part of the cyclone separator (5) enters the inert particles multi-room fluidized bed dryer (3) through the back-mixing in a mixer (2). Waste liquid from the bottom of the spray tower (7) enters a waste liquid circulating pool (8), with part of waste liquid circulating into the spray tower (7) and part into a sewage treatment system.

Description

technical field [0001] The invention relates to a method for drying wet sludge, in particular to a closed multi-chamber fluidized bed sludge drying method. Background technique [0002] Sludge is a high-moisture porous medium material with high water content and large volume. The moisture content of untreated sludge is as high as 95%. Landfilling, composting and fuel utilization of sludge all require the moisture content of sludge to be reduced to below 65%. At present, the mechanical dehydration method can only reduce the moisture content to 70% to 80%. To remove the capillary water and adsorbed water of the sludge, the thermal drying method must be used. [0003] Since the invention of fluidization technology in 1921, its characteristics of large heat capacity coefficient, high thermal efficiency, good sealing performance and adjustable residence time have provided the most favorable conditions for the high degree of drying of materials, so it has become the best drying p...

AI Technical Summary

Problems solved by technology

[0007] Technical problem: The present invention proposes a closed multi-chamber fluidized bed sludge drying method for the current problems of agglomeration, low thermal efficiency, and pollutant discharge in the sludge drying process. The method has the advantages of simple equipment structure and easy operation Convenience, strong sludge adaptability, high thermal efficiency, safety, continuity, stability, etc.

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