A low-temperature drying device for discharging cooling heat recovery sludge and its control method

Abstract

The invention discloses a low-temperature drying device for discharging cooling heat to recover sludge, which comprises a drying box, a sludge inlet arranged at the top of one end of the drying box, and a sludge outlet at the bottom of the other end. In the drying box, a mesh belt set is provided from the sludge inlet to the sludge outlet, and it is characterized in that, along the conveying direction of the mesh belt set, at least a plurality of dehumidifiers are arranged around the mesh belt set. A cooling heat recovery module for reducing the temperature of the discharged sludge and recovering its heat is provided around the mesh belt group at a position close to the sludge outlet. The invention cools the sludge at the discharge end of the lower layer to normal temperature or below through the cooling heat recovery module, reduces sludge fermentation and odor emission, and at the same time recovers the heat of the discharge sludge from the lower layer to the sludge fed from the upper layer to prevent organic waste. The risk of spontaneous combustion caused by heat accumulation inside the dried sludge, while improving the efficiency of system operation.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a low-temperature drying device for discharging cooling heat recovery sludge and a control method thereof. Background technique [0002] Wastewater treatment of industrial enterprises and municipal domestic sewage treatment will produce sludge. According to the composition and properties of sludge, it can generally be divided into two categories: organic sludge and inorganic sludge. Sludge is a by-product produced in the process of sewage and wastewater treatment. It is a concentrate after the transfer of pollutants in sewage and wastewater, and often contains toxic and harmful substances or odors. Regardless of whether it is organic sludge or inorganic sludge, the moisture content of the sludge after mechanical dehydration in the factory is about 65-90%. It has a large volume and weight, and the risk of environmental pollution is high. These sludges basically need to b...

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Problems solved by technology

[0006] For this reason, the present invention provides a low-temperature drying device for discharging cooling heat recovery sludge and its control method to solve the problem of odor volatilization and heat accumulation inside the pile after drying in the prior art. Problems with a risk of spontaneous combustion

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