Energy-saving refrigeration pretreatment device for deep dehydration of sludge in sewage treatment plants

Abstract

The invention relates to an energy-saving refrigerating pretreatment device for deep sludge dehydration of a sewage treatment plant. the device is structurally characterized in that a compressor indoor machine, two compressor outdoor machines and a plurality of conveyor shafts are arranged inside each heat preservation room; the conveyor shafts are fully covered with filter cloth; one compressor outdoor machine is arranged at the outer top of the heat preservation room; the other compressor outdoor machine is arranged at the inner bottom of the heat preservation room; and each compressor indoor machine is respectively connected with the outdoor machine at the outer top of the same heat preservation room and the outdoor machine at the inner bottom of an adjacent heat preservation room. Refrigeration and heat dissipation parts of the compressors are arranged into two heat preservation rooms, and sludge is evenly spread on each layer of filter cloth in each heat preservation room through transmission shafts and the filter cloth, so that the space is effectively utilized, the heat exchange area is expanded, the freezing and thawing efficiency is improved, and meanwhile, the transmission shafts run in opposite directions, so that the temperature in the room is equal to the external environment temperature when the sludge is put into and discharged out of the heat preservation room, heat exchange between inside and outside of the heat preservation rooms is avoided, and the best energy conservation effect is achieved in the freezing process.

Description

technical field [0001] The invention relates to the field of deep dehydration treatment of sludge in sewage treatment plants, in particular to an energy-saving freezing pretreatment device for deep dehydration of sludge in sewage treatment plants. Background technique [0002] With the rapid development of my country's economy and the acceleration of urbanization, more and more sewage is produced every day, and the corresponding sludge output of sewage treatment plants is also increasing. However, the sludge used in sewage treatment plants in my country Most of the treatment processes or methods can only reduce the moisture content of sludge in sewage treatment plants to about 80%, which is high in moisture content and large in volume, and is not conducive to subsequent later stages or resource utilization. In recent years, the method of adding lime + plate and frame filter press can reduce the moisture content of sludge to below 60%, but the addition of a large amount of lim...

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Problems solved by technology

[0013] After sludge freezing pretreatment, the moisture content can be easily reduced to below 60% without adding any materials, but the low efficiency and high cost of freezing pretreatment limit the use of this method

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