Urban sludge deep drying device

Abstract

A municipal sludge deep drying device is disclosed. The device includes a feeding unit and a free-water drying unit. The feeding unit is disposed above the free-water drying unit, and includes a feeding port, arc ultrasonic plates, a spiral feeder and a material shearing and extruding mechanism. The arc ultrasonic plates are symmetrically arranged outside a tube wall of a passageway below the feeding port. The spiral feeder is disposed in the passageway. The passageway is communicated with the material shearing and extruding mechanism. The free-water drying unit includes a plurality of drying belts disposed in a housing in order from top to bottom. A particle collecting and resetting mechanism is arranged between a corresponding tail and a corresponding head of drying belts adjacent in the vertical direction. The discharging port of the material shearing and extruding mechanism is communicated with the feeding port of the housing of the feeding unit. Material secondary distribution particles are adopted by the device, and a particle water balance is reset in a half-dry state to make energy minimized. Temperature and humidity can be controlled in a layered manner so that a product is more suitable for a next step. The heat efficiency of the device is high.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to an urban sludge deep drying device. Background technique [0002] Municipal sludge usually refers to the solid sediment produced in the process of sewage treatment by urban sewage treatment plants (and sometimes waterworks). Harmful substances such as parasite eggs, therefore, if no harmless treatment is carried out, it will cause serious secondary pollution to the environment. [0003] Driven by the acceleration of urbanization in our country, the rapid increase of urban population, and the continuous growth of national investment in environmental protection, more and more sewage treatment plants have been built, the ability to control water pollution has continued to increase, and sludge production has also increased. According to the calculation of the Chinese Academy of Environmental Sciences, in 2012, the annual sewage treatment capacity of my count...

AI Technical Summary

Problems solved by technology

The moisture content of undewatered sludge is greater than 90%, and the moisture content of preliminary dewatered sludge is also as high as 80%, resulting in high transportation costs, large storage areas, squeezed landfill storage capacity, and blocked landfill leachate pipes;

[0006] (2) Bacterial growth

[0007] (3) Air pollution

Sludge piled in the open air emits odor and peculiar smell, exposed to the sun and wind, pollutant particles will cause air pollution;

[0008] (4) Pollution of water bodies

According to the existing sludge drying equipment, foreign (or copied foreign) composite equipment also has a place, but compared with this type of equipment, it can be found that the air flow of this type of equipment is not controlled in sections, and there is no secondary particle distribution for sludge. After the particles are dried, the surface shrinkage is large, the moisture gradient of the particles is large, the product density is small, and the finished product cannot be reduced to the greatest extent. It is unsatisfactory to use its finished product to burn, dry distillation, and make activated carbon. cause a lot of energy waste

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