Cross-flow belt type sludge dryer

Abstract

The invention provides a cross-flow belt type sludge dryer. The sludge dryer includes a tank body. The tank body has a plurality of drying layers arranged in parallel from top to bottom. The drying layers are metal mesh-shaped conveying belts with opposite running directions. Materials are sequentially transferred from an upper drying layer to a lower drying layer by gravity. Drying air enters cross-flow air pipes of each drying layer from the upper part of the tank body through an air duct, and the low-temperature high-humidity air that is obtained after drying is discharged from a pluralityof exhaust outlets below the dryer. The bottom layer of the dryer is a sweeping layer, and the dried materials and fallen materials of each drying layer are swept to a material outlet at the lower part of the tank body of the dryer. A feeding port is in the upper part of the dryer. After semi-dry sludge is granulated, the sludge is fed into the dryer, and a granulator is located above the feedingport of the dryer, and is roll-type shearing type device. The invention provides the belt type sludge dryer in which the semi-dry sludge with a moisture content of 68-72% can be dried to obtain driedsludge with a moisture content of 10-20%, heat of incineration of the dried sludge can satisfy heat required by the dryer, and the heat efficiency is high.

Description

technical field [0001] The invention relates to the field of municipal sludge treatment, in particular to a belt sludge dryer. Background technique [0002] In the current municipal sludge treatment technology, incineration can fully burn the combustible components in the sludge at high temperature, and finally become stable ash. The incineration method has the advantages of volume reduction, high weight reduction rate, fast processing speed, thorough harmless treatment, and reusable waste heat. The main purpose of incineration is to incinerate waste as much as possible, make the incinerated substances harmless and reduce volume to the greatest extent, and minimize the generation of new pollutants to avoid secondary pollution. [0003] The sludge discharged from sewage treatment usually has a moisture content of more than 80%, and such sludge needs to be dried to a moisture content of 10-20% before self-sustaining incineration; and the average calorific value of the dry bas...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the air supply of the dryer is unreasonable, it is not conducive to the heat absorption inside the sludge, the thermal efficiency is low, and a large number of auxiliary heat sources need to be added during the drying process of the sludge, and a through-flow sewage The mud belt dryer adopts a through-flow method to enter the air, and directly passes the hot air through the sludge to be dried, so that the sludge can effectively absorb heat, improve the thermal efficiency of the dryer, and achieve the purpose of energy saving

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