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 particularly relates to a vertical thin-layer sludge drying equipment. Background technique [0002] With the development of my country's economy, urban wastewater discharge is increasing, and the production capacity of sludge plants has also increased substantially. Sludge treatment and disposal has gradually become the focus of attention at home and abroad. The current sludge disposal methods in my country are mainly sanitary landfill, composting, direct land use and incineration. The moisture content of sludge is the key to restricting the disposal of sludge. The reduction of the moisture content of sludge from 95% to 60% is the starting point for landfilling and composting, and the starting point for incineration from 95% to 50%. The traditional mechanical dewatering method can reduce the moisture content of the sludge to about 75%. To further reduce the moisture content, i...

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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 ha

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