Brief introduction to the four problems that should be paid attention to in the application of sewage source heat pump system

The so-called sewage source heat pump, mainly to urban sewage as a source of cold and heat extraction and storage of energy, with the heat pump unit system internal refrigerant cycle changes, consumption of small amounts of electricity, so as to achieve the effect of refrigeration and heating an innovative technology . Compared with other heat sources, the technical key and difficult point of sewage source heat pump is anti-clogging, anti-pollution and anti-corrosion. Sewage source heat pump system applications should pay attention to the problem: 1, sewage water quality problems, urban sewage, including industrial wastewater, industrial cooling water, and domestic sewage. Urban secondary effluent is mainly through a physical and chemical treatment and secondary biochemical treatment, removing a lot of impurities in the sewage, reducing the corrosiveness of sewage, but also more conducive to the extraction of heat energy in sewage. 2, Sewage water temperature protection, urban sewage is warm in winter and cool in summer, perennial temperature is stable, the sewage temperature is 15 to 20 degrees higher than the ambient temperature in winter, and the summer temperature is 10 to 15 degrees lower than the ambient temperature. Therefore, the heat pump has a good heat source, sewage source heat pump temperature difference is generally 5 degrees, therefore, sewage source heat pump can run efficiently. 3, the assurance of the amount of sewage, urban sewage water changes are mainly changes in domestic sewage, and domestic sewage water remained basically unchanged. 4, sewage heat transfer problems, the sewage contains a lot of oily dirt, heat transfer occurs when there will be hanging membrane phenomenon, close the sticky sludge, thereby increasing the heat transfer resistance, affecting the heat transfer efficiency, so re-design of sewage When the sewage heat pipe to go tube, and set automatic anti-cleaning device, the heat exchanger regularly run backwash to ensure heat transfer efficiency, improve heat utilization.

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