Sludge drying processing method and equipment

Abstract

The invention discloses a sludge drying processing method; firstly, the filter-pressed sludge and combustible material are mixed, the mixed sludge is extruded into sludge string by a sludge string extrusion machine at the top part of a pre-baking tank, in the dropping process of the sludge string, an infrared lamp on the inner wall of the pre-baking tank is used for shadowless irradiation, and a layer of soft shell is formed at the outer surface of the sludge string after the heat is adsorbed; the invention further discloses equipment for realizing the method; the equipment solves the problems that the traditional belt drier has short distance of the sludge strings, so as to cause caking, and the distance is long, the unit treatment capacity is low, hot air heat is hard to be utilized effectively and the drying speed is low; the equipment is particularly suitable for sludge dry treatment for sludge incineration; the invention can promote the industrialization progress of the sludge drying incineration.

Description

technical field [0001] The invention relates to a sludge treatment method, in particular to a sludge drying treatment method. The invention also relates to a device for realizing the sludge drying treatment method. Background technique [0002] The incineration treatment of sewage plant sludge can make full use of the characteristics of sludge containing a large amount of combustible substances, and the treated sludge can be used as fuel. However, the water content of the sludge produced by the sewage plant is still as high as 70% to 80% after mechanical dehydration, so it cannot be used for direct incineration. Sludge must be effectively dried before it can be used for incineration. [0003] The belt dryer is favored for its advantages of good air permeability, adjustable residence time, no violent movement of materials, and high drying intensity. Air is supplied vertically to the conveying mesh belt, passes through several layers of sludge-carrying mesh belts, and conta...

AI Technical Summary

Problems solved by technology

Because the sewage sludge is very sticky, the traditional belt dryer can only spread one layer of mud strings on the wire mesh and the sludge strings must keep a large distance, resulting in low output of the belt dryer and hot air at the same time. The heat is discharged without being fully utilized, wasting a lot of heat source

In addition, there is a special adhesive phase stage (moisture content is about 60%) in the sludge drying process. In this extremely narrow transition period, the sludge is easy to agglomerate, the surface is hard and difficult to crush, and the inside is It is still a thin sludge, which makes it difficult to transfer moisture to the outside, resulting in a low sludge drying rate and high treatment costs

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