I. Introduction
Municipal wastewater (industrial wastewater and domestic sewage) contains high waste heat, as a heat pump heat source for the building heating air conditioning great prospects. At present, there are quite a few researches on urban sewage source heat pump, but most of the researches focus on the application characteristics, economic value, social benefits and forecast of sewage source heat pump. However, There is very little research into heat and pollution prevention. In this paper, some key technologies of sewage source heat pump are discussed, and the feasible measures of preventing pollution and sewage are given, which is helpful to the application and research of urban sewage source heat pump.
Second, sewage source heat pump profile
1. Sewage source heat pump principle
Sewage source heat pump is a city of sewage as a heat source in winter, through the electric compressor to convert low-temperature heat of sewage into a higher grade of heat supply to users. In summer as a cooling source, the cooling system is used to generate low temperature to meet the needs of users. This device can be used as heating heating equipment, cooling equipment can be used as cooling, so as to achieve a dual-use machine.
2. Sewage source heat pump advantages
Although the sewage water source heat pump in our country only in the experimental and exploration stage, but it has fully demonstrated its superiority, the main performance is as follows:
1) Compared with the air source heat pump, it avoids the problems of frosting and defrosting in winter, and makes the performance of the heat pump stable due to the constant water temperature. Sewage water source heat pump heating refrigeration coefficient of up to 5 to 6, 40% higher than the traditional air-source heat pump.
2) Compared with groundwater source heat pump, the sewage water source heat pump does not need to extract groundwater from the underground or recharge the water to the ground, thus not only saving the capital investment for well drilling but also saving the operation cost of pumping and recharging. At the same time, problems such as the destruction of groundwater resources caused by improper recharge can also be avoided.
3) Compared with the electric boiler, the sewage water source heat pump saves more than two-thirds of the electric energy, which saves 1/2 energy compared with the fuel boiler; besides, it can avoid the air pollution caused by using the traditional boiler and has a good environmental protection effect.
3. Block the pollution problem
Urban sewage contains a large number of large-scale contaminants and small-scale suspended solids. The former will block the pipes and equipment of the sewage source heat pump system, while the latter will generate thermal resistance and influence on the flow and thermal properties of the fluid
Parameters affect. It is not feasible to dispose of primary wastewater and reuse its heat because the minimum cost of sewage treatment is also higher than the value of extracting heat or cold from wastewater. The sewage taken to the system for filtering is not a good idea, the most important thing is the system of filter grille on the removal of dirt. Due to the poor water quality of urban sewage, the clearance of the contaminants on the filter grille is large and the frequency is high, the mechanical grille must be used, but the cost is high, covering a large area, and the treatment of contaminants and the cleanliness of the air between the equipment The maintenance problem. In addition, there is also the problem of siltation and cleaning of contaminants in the diversion section pipeline between the urban sewage trunk and the filtration grille. Therefore, the best way is to block the contaminants in the trunk of the sewage, prevent large-scale contaminants from entering the system and develop new decontamination technologies. The following is the Beijing Ruiboli Thermal Technology Co., Ltd. independently developed patented product: the seventh generation of all-intelligent anti-drag machine.
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