Double-cooling heat source heat pump low-temperature sludge drying system with waste heat recovery function and application method thereof

Abstract

The invention discloses a double-cooling heat source heat pump low-temperature sludge drying system with a waste heat recovery function and an application method thereof, and belongs to the technical field of sludge treatment equipment. The double-cooling heat source heat pump low-temperature sludge drying system comprises a first refrigerant circuit, a second refrigerant circuit, a heat pipe circuit, a first sewage circuit and a second sewage circuit. The structure is novel, operation principles are clear, sensible heat of return air is absorbed by a heat pipe exchanger, and dehumidified air is preheated; sewage of a sewage plant is used as a heat source to provide energy for a heat pump system; in an early stage of drying, the system operates under a temperature rise condition, and rapid and stable operation can be realized as the sewage serves as the heat source; in a later period of drying, the sewage of the sewage plant serves as a cold source to take away extra heat, and the system operates under a heat release condition; the sewage can take away the extra heat rapidly when serving as the cold source, so that energy can be saved, initial equipment investment can be reduced, and the cost of the sludge drying system can be further lowered.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment equipment, and relates to a low-temperature drying system for heat pump sludge and its use method, in particular to a low-temperature drying system for heat pump sludge with dual heat sources and double cold sources with waste heat recovery and its Instructions. Background technique [0002] Sludge is the product of sewage treatment and water treatment. Sludge contains a lot of water. If it is not treated enough, it will cause serious secondary pollution. Therefore, the treatment and disposal of sludge is of great significance. In the process of sludge treatment, it must first go through the steps of concentration, dehydration and drying, and then process it through recycling extraction, composting, incineration, landfill and carbonization to reduce the secondary pollution caused by sludge. , to recycle some components in the sludge. [0003] With the substantial increase in sewage trea...

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Problems solved by technology

[0003] With the substantial increase in sewage treatment capacity, the amount of sludge produced has also increased significantly. Most of the sludge is simply dehydrated to 80% by belt filter presses or centrifuges, and then transported out for disposal. easy to cause secondary pollution

However, the existing sludge drying heat pump needs to cool and dehumidify the return air at the same time, resulting in a decrease in dehumidification capacity, and the temperature in the drying room is low in the initial stage of drying, and all the energy of the system comes from the work of the compressor and the input power of the fan. Slower, use additional heat source to heat the air and discharge the air after moisture absorption, which is easy to generate waste heat and low energy utilization rate; the heat released by the heat pump condenser in the later stage of drying is greater than the energy required for air heating, and a cooling tower is required for auxiliary heat dissipation. In order to quickly take away excess heat, this not only causes a waste of energy, but also increases the cost of the sludge drying system

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