A method of drying sludge using solar energy and waste heat of flue gas

Abstract

The present invention discloses a method and system for drying sludge by utilizing solar energy and waste heat of flue gas. The method includes step S10, mechanically drying and laying the sludge; step S20, heating the sludge by using a solar panel on the roof, and in step S20. The cavity provided in the stainless steel platform heats the sludge through the heat release of the high-temperature flue gas, and the sludge temperature is controlled to be above 85°C through the above two methods and an infrared online thermometer, and is maintained for a set period of time; step S30, online detection The humidity of the air in the shed, if the air in the greenhouse is discharged according to the humidity; step S40, the moisture content of the sludge is detected online, if it is lower than the set value of the moisture content, the sludge is turned over and steps S20 to S40 are repeated, otherwise, the sewage is collected. The sludge is sent to the sludge storage silo. The method and system integrating solar drying and flue gas waste heat drying are adopted to reduce the floor space of sludge drying, and avoid the disadvantage of using solar energy alone to dry sludge which is easily affected by weather. Sludge and flue gas indirectly Heat exchange to avoid cross-contamination of sludge and flue gas.

Description

technical field [0001] The invention relates to the field of sludge drying, in particular to a method and system for drying sludge by utilizing solar energy and waste heat of flue gas. Background technique [0002] Sludge contains a large amount of harmful substances, such as heavy metals, bacteria, various parasite eggs, a large number of pathogenic microorganisms, etc., and it is easy to form "secondary pollution". Solid waste with serious hazards. In particular, the sludge contains a variety of heavy metals, including copper, zinc, lead, cadmium, chromium, etc. If not handled properly, it will seriously endanger the ecological environment and human health in the areas where the sludge is dumped and used. [0003] At present, the sludge disposal technologies mainly include: sanitary landfill, composting and sludge drying and incineration. Sanitary landfill has low investment, large capacity, quick effect and low disposal cost, but it can easily lead to clogging of landfi...

AI Technical Summary

Problems solved by technology

[0004] However, my country's sludge drying and incineration technology still has problems such as low treatment efficiency, serious odor pollution, and high energy consumption in the drying process. Secondary pollution is serious, and there are fire hazards; steam drying has less odor emission, stable system, high safety, but higher energy consumption; solar drying technology has low energy consumption, but occupies a large area and is easily affected by the weather

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