Rotary drum type film squeezing sludge dryer

Abstract

The invention relates to a rotary drum type film squeezing sludge dryer, belongs to the technical field of environmental protection equipment, and relates to drying of dewatered sludge in an urban sewage treatment plant, particularly to a rotary drum type film squeezing sludge drying device for treating sewage sludge. The rotary drum type film squeezing sludge dryer is characterized in that pressure rollers drive a conveying net belt to rotate along with a rotary heating surface in which water vapor is introduced, and the dewatered sludge is driven to rotate along the rotary heating surface and the conveying net belt, so that the moisture content of the sludge is greatly decreased by virtue of the heat conduction function of the water vapor; an air suction hood is added outside for collecting, treating and recycling the hot gas generated through drying and providing the negative pressure environment for sludge drying, so that the drying effect of sludge is improved. The rotary drum type film squeezing sludge dryer has the benefits that the dryer has the advantages of being compact in structure, low in manufacture cost, low in energy consumption, quick in drying, convenient to check and maintain, and the like, and is quite applicable to large-batch sludge drying, so that the reduction and reutilization of sludge are achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection equipment and relates to the drying of dewatered sludge in urban sewage treatment plants, in particular to a sludge drum-type film-pressing drying equipment for treating sewage sludge. Background technique [0002] The moisture content of dewatered sludge in sewage plants is about 80% on a wet basis, and it is difficult to realize resource utilization without further treatment. As an important method of sludge treatment, drying has developed rapidly in recent years. Sludge drying mainly includes direct drying and indirect drying. The heat required for indirect drying is transferred to the sludge through heat conduction. The advantage of indirect drying is that there is no danger of explosion and fire, the amount of tail gas produced by drying is small, the drying heat efficiency is high, the operating cost of tail gas deodorization treatment is low, and the economy of drying tre...

AI Technical Summary

Problems solved by technology

The advantage of indirect drying is that there is no danger of explosion and fire, the amount of tail gas produced by drying is small, the drying heat efficiency is high, the operating cost of tail gas deodorization treatment is low, and the economy of drying treatment is better. The disadvantage is that the drying process and equipment are uniform. It is more complicated, the processing capacity of a single machine is small, and it is easy to stick to the wall, so it is not suitable for the sludge with strong adhesion

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