Vertical type sludge thin layer drying device

Abstract

The invention discloses a vertical type sludge thin layer drying device, which comprises a sludge inlet section, an evaporation section, a sludge outlet section and a heat conduction oil pipe, wherein the sludge inlet section and the evaporation section form a heating cabin, a rotary main shaft with a rotary scraper and an oil cavity liner is arranged in the heating cabin, the rotary main shaft is composed of a sludge inlet section shaft, an evaporation section shaft and a sludge outlet section shaft, an evaporation cylinder of the heating cabin is provided with a fixed scraper, the evaporation cylinder is provided with an oil cavity outer container, and a fixed heat conduction oil inlet in the evaporation cylinder, a fixed heat conduction oil outlet in the evaporation cylinder, the oil cavity outer container and an oil pipe form a fixed oil line system; an oil line is arranged in the evaporation section shaft, the sludge inlet section shaft is provided with a rotary heat conduction oil outlet, the sludge outlet section shaft is provided with a rotary heat conduction oil inlet, and the rotary heat conduction oil inlet, the rotary heat conduction oil outlet, the oil line in the shaft, an oil cavity container and an oil pipe form a rotary oil path system; a flange of the sludge inlet section is provided with a sludge inlet and a steam outlet, and a flange on the sludge outlet section is provided with a sludge outlet. The heat transfer efficiency in the drying process is high, the heat loss is relatively low, the dust is basically avoided, the drying process is independent of dry sludge backmixing, and the sludge with water content of 85-70% can be dried to water content of 50-35%.

Description

technical field [0001] The invention belongs to the technical field of urban sewage sludge drying, and in particular relates to a vertical sludge thin-layer drying equipment. Background technique [0002] With the development of my country's economy, the discharge of urban wastewater is increasing day by day, and the production capacity of sludge plants has also been greatly increased. Sludge treatment and disposal have gradually become the focus of attention at home and abroad. At present, the sludge disposal methods in my country mainly include sanitary landfill, composting, direct land use and incineration. The water content of sludge is the key to restricting sludge disposal. The water content of sludge from 95% to 60% is the starting point of landfill and composting, and from 95% to 50% is the starting point of incineration. The traditional mechanical dehydration method can reduce the moisture content of the sludge to about 75%. To further reduce the moisture content, ...

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Problems solved by technology

Existing drying technologies and equipment such as drum sludge drying equipment and multi-stage disc sludge drying equipment mainly rely on sludge back-mixing, and fluidized bed sludge drying equipment relies on convective heat transfer. They all have the disadvantages of low heat transfer efficiency, large heat loss, and high dust content. At present, the sludge thin-layer drying technology is an efficient, energy-saving, safe and environmentally friendly technology to solve the above problems.

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