Water source heat pump system for raising temperature of sewage

Abstract

The invention relates to a water source heat pump system for raising the temperature of sewage in the fields of sewage treatment and renewable energy utilization. In order to solve the problem that the temperature of raw sewage in Shanxi, Inner Mongolia and other areas in winter is low to affect biochemical reaction, the system uses treated reclaimed water as a heat source of a water source heat pump to increase the temperature of the raw sewage. Compared with a traditional boiler heat supply and air source heat pump, the system has the advantages of being efficient in energy utilization, environmentally friendly, safe, high in energy efficiency ratio, stable in performance and the like. Influence on sewage treatment capacity and water quality is avoided through indirect heat exchange, the temperature of discharged reclaimed water is low, disturbance to residents is reduced, the automation degree is high, remote control of a central control room can be achieved, the problem of temperature rise of raw sewage is effectively solved, and the sewage treatment effect is ensured.

Description

Technical Field

[0001] The invention relates to the fields of sewage treatment and renewable energy utilization, and in particular to a water source heat pump system for sewage temperature increase. Background Art

[0002] The cold winter climate and the water usage habits of residents often cause the temperature of the original sewage entering the sewage treatment plant to be lower than 10°C. In the biochemical reaction of sewage, the nitrification and denitrification bacteria in the anaerobic and anoxic processes, as well as aerobic microorganisms, all need a water temperature above 12°C to maintain effective biological activity, thereby ensuring that the sewage achieves the expected treatment effect.

[0003] Traditional sewage temperature raising methods mostly use coal-fired boilers and gas-fired boilers as heat sources. However, coal-fired boilers have serious drawbacks. The exhaust gas they emit is difficult to meet standards and will pollute the atmospheric environment. At the same time, sewage treatment plants are generally located outside the city, and it is difficult to lay natural gas pipelines and municipal heating, which limits the use of gas boilers. In addition, when using air source heat pumps for heating, its heating efficiency is greatly affected by the outdoor air temperature. In the cold northern regions, the outdoor temperature often drops to minus ten degrees Celsius or even lower in winter. At this time, the heat energy content in the air drops sharply, the heating capacity of the air source heat pump decreases, and frost is prone to occur, resulting in a significant reduction in its coefficient of performance (COP value), and auxiliary heating equipment is often required to meet the heating needs. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a water source heat pump system for sewage heating, so as to solve the problems of low energy conversion efficiency, environmental pollution and explosion risk in the boiler heating used for traditional sewage heating in the prior art, and the air source heat pump heating is greatly affected by the outdoor temperature, and the heating capacity and COP value drop significantly at low temperatures, requiring auxiliary heating.

[0005] According to a first aspect of an embodiment of the present invention, there is provided a water source heat pump system for heating sewage, comprising: a coarse screen, a raw water lifting pump room, a fine screen, a biochemical pool, a secondary sedimentation tank, a reclaimed water lifting pump room, a contact pool, a sewage heat exchanger, a reclaimed water heat exchanger, and a water source heat pump unit;

[0006] The coarse grid is connected to the raw water lifting pump room, and the raw water lifting pump room is respectively connected to the sewage heat exchanger and the fine grid;

[0007] The fine grid is connected to the biochemical pool, the secondary sedimentation tank, the reclaimed water lift pump room, the contact tank in sequence, and is also connected to the sewage heat exchanger;

[0008] The water source heat pump unit is connected to the sewage heat exchanger and the grey water heat exchanger respectively;

[0009] The grey water heat exchanger is connected to the contact tank and the grey water lift pump room respectively. Further, the water source heat pump unit comprises:

[0010] Evaporators, condensers, compressors and expansion valves are used to utilize low-grade thermal energy resources in sewage and transfer low-grade thermal energy to high-grade thermal energy through a small amount of high-grade electrical energy input;

[0011] The evaporator outlet is connected to the compressor intake port, the compressor exhaust port is connected to the condenser inlet, the condenser outlet is connected to the expansion valve inlet, and the expansion valve outlet is connected back to the evaporator inlet to form a refrigerant circulation passage.

[0012] Furthermore, the system further comprises:

[0013] Temperature and pressure sensors are respectively arranged on the preset sewage water supply and return main pipe, the preset grey water supply and return main pipe and the preset heat medium water supply and return main pipe, and the temperature sensor adopts armored PT100 thermal resistor.

[0014] Furthermore, the system further comprises:

[0015] A water inlet metering device is provided on the preset water supply main.

[0016] Furthermore, the system further comprises:

[0017] Ultrasonic level meters are installed in sewage and reclaimed water lift pump rooms to control the start and stop of submersible pumps.

[0018] Furthermore, the system further comprises:

[0019] A temperature detection wireless transmitter is provided in each group of pool bodies of the biochemical pool.

[0020] Furthermore, the system further comprises:

[0021] Monitoring system;

[0022] The monitoring system is composed of a monitoring station, a PLC control station and a communication network.

[0023] Furthermore, the sewage heat exchanger adopts a wide channel type.

[0024] Furthermore, the system further comprises:

[0025] The conversion valve is used to control the operation of the sewage heating system. The technical solution provided by the embodiment of the present invention may have the following beneficial effects:

[0026] Efficient energy utilization: Using the tailwater from the sewage treatment plant as a heat source can improve the comprehensive energy efficiency of the water source heat pump and achieve energy recycling.

[0027] The environmental advantages are significant: reducing dependence on non-renewable and highly polluting fossil energy, reducing pollutant emissions, lowering greenhouse gas emissions, and helping to address climate change.

[0028] Improved safety performance: The working pressure and temperature conditions of the water source heat pump system are mild, there is no combustion process, no open flame or explosion risk, which improves the safety of energy utilization.

[0029] High energy efficiency ratio: Heat is "transferred" by electrically driving the compressor, and the energy efficiency ratio can reach 3-5 or even higher, meeting the needs of energy conservation and emission reduction.

[0030] The performance is better than that of air source heat pump: in winter, the sewage temperature is higher than the outdoor air temperature, and the heating capacity and energy efficiency of water source heat pump are higher than those of air source heat pump.

[0031] Stabilize sewage treatment: Use indirect heat exchange without increasing the load on the biological pool, thus avoiding the increase in sewage treatment capacity and unstable water quality.

[0032] Reduce nuisance to residents: The temperature of the discharged water is low, which avoids the white smoke and increased odor in cold weather, and reduces the nuisance to residents caused by discharged sewage.

[0033] High degree of automation: The whole process does not require human intervention and can be automatically controlled in the central control room.

[0034] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0036] Figure 1 is a schematic diagram showing the composition of a water source heat pump system for heating sewage according to an exemplary embodiment;

[0037] Figure 2 is a schematic diagram of a process flow for increasing the temperature of sewage according to an exemplary embodiment;

[0038] Figure 3 It is a schematic diagram of a process flow of a water source heat pump unit according to an exemplary embodiment. DETAILED DESCRIPTION

[0039] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0040] Embodiment 1

[0041] See also Figure 1 , Figure 1 The present invention is a schematic diagram showing a water source heat pump system for heating sewage according to an exemplary embodiment, wherein the system comprises:

[0042] Coarse screen 1, raw water lifting pump room 2, fine screen 3, biochemical pool 4, secondary sedimentation tank 5, reclaimed water lifting pump room 6, contact pool 7, sewage heat exchanger 8, reclaimed water heat exchanger 10, water source heat pump unit 9;

[0043] The coarse screen 1 is connected to the raw water lift pump room 2, and the raw water lift pump room 2 is connected to the sewage heat exchanger 8 and the fine screen 3 respectively;

[0044] The fine grid 3 is connected to the biochemical pool 4, the secondary sedimentation tank 5, the reclaimed water lift pump room 6, the contact pool 7 in sequence, and is also connected to the sewage heat exchanger 8;

[0045] The water source heat pump unit 9 is connected to the sewage heat exchanger 8 and the grey water heat exchanger 10 respectively;

[0046] The reclaimed water heat exchanger 10 is connected to the contact tank 7 and the reclaimed water lift pump room 6 respectively. Further, the water source heat pump unit 9 comprises:

[0047] Evaporators, condensers, compressors and expansion valves are used to utilize low-grade thermal energy resources in sewage and transfer low-grade thermal energy to high-grade thermal energy through a small amount of high-grade electrical energy input;

[0048] The evaporator outlet is connected to the compressor intake port, the compressor exhaust port is connected to the condenser inlet, the condenser outlet is connected to the expansion valve inlet, and the expansion valve outlet is connected back to the evaporator inlet to form a refrigerant circulation passage.

[0049] In a specific implementation, the outlet of the evaporator is connected to the air intake of the compressor, and the low-temperature and low-pressure gaseous refrigerant coming out of the evaporator is sucked into the compressor. The exhaust port of the compressor is connected to the inlet of the condenser, and the high-temperature and high-pressure gaseous refrigerant compressed by the compressor enters the condenser. The outlet of the condenser is connected to the inlet of the expansion valve, and the high-pressure liquid refrigerant after heat release and condensation in the condenser flows into the expansion valve. The outlet of the expansion valve is connected to the inlet of the evaporator, and the low-temperature and low-pressure liquid refrigerant after throttling and pressure reduction by the expansion valve enters the evaporator.

[0050] Furthermore, the system further comprises:

[0051] Temperature and pressure sensors are respectively arranged on the preset sewage water supply and return main pipe, the preset grey water supply and return main pipe and the preset heat medium water supply and return main pipe, and the temperature sensor adopts armored PT100 thermal resistor.

[0052] Furthermore, the system further comprises:

[0053] A water inlet metering device is provided on the preset water supply main.

[0054] Furthermore, the system further comprises:

[0055] An ultrasonic level meter is provided in the sewage and reclaimed water lift pump room 6 to control the start and stop of the submersible pump.

[0056] Furthermore, the system further comprises:

[0057] A temperature detection wireless transmitter is provided in each group of pool bodies of the biochemical pool 4 .

[0058] Furthermore, the system further comprises:

[0059] Monitoring system;

[0060] The monitoring system is composed of a monitoring station, a PLC control station and a communication network.

[0061] Furthermore, the sewage heat exchanger 8 adopts a wide channel type.

[0062] Furthermore, the system further comprises:

[0063] A conversion valve, wherein the conversion valve is used to control the operation of the sewage heating system.

[0064] For specific implementation, please refer to Figure 2 as well as Figure 3 The treatment process of the water source heat pump system for sewage heating is as follows:

[0065] Pretreatment stage: The raw sewage first flows into the coarse screen 1, which will intercept the larger impurities in the sewage, reduce the impurity content entering the subsequent equipment, and prevent large particles of impurities from damaging the equipment or clogging the pipeline. The 8℃ sewage treated by the coarse screen 1 enters the raw water lifting pump room 2, and is transported to the sewage heat exchanger 8 by the pressure of the raw water lifting pump.

[0066] Temperature raising and sewage treatment stage: When the temperature sensor of the sewage water supply main detects that the raw water temperature is less than or equal to 11°C, the system starts the conversion valve to introduce the sewage into the sewage heat exchanger 8. At the same time, the water source heat pump unit 9 is started. In the water source heat pump unit 9, the cold intermediate water passes through the evaporator and transfers heat to the heat pump refrigerant. The refrigerant condenses and releases heat after passing through the throttle valve to form hot intermediate water. The hot intermediate water is transported from the condenser to the sewage heat exchanger 8 through a circulating pump, and heat is exchanged with the raw water to raise the raw water temperature to above 12°C. The heated raw water is sent back to the fine grid 3 and enters the biochemical pool 4 and the secondary sedimentation tank 5 in turn. In the biochemical pool 4, the water temperature is maintained above 12°C to ensure the biological activity of nitrification and denitrification bacteria, aerobic microorganisms, etc., so that the sewage can be effectively treated. The treated sewage enters the secondary sedimentation tank 5 for solid-liquid separation.

[0067] Recycled water heat exchange and discharge stage: The water treated in the secondary sedimentation tank 5 enters the recycle water lift pump room 6, where water is taken and transported to the recycle water heat exchanger 10 by the pressure of the recycle water lift pump. As the low-level heat source of the water source heat pump, the recycle water exchanges heat with the cold intermediate water in the recycle water heat exchanger 10 to release the residual heat. The recycle water after heat exchange is discharged to the contact tank 7 and finally meets the discharge standards. After the cold intermediate water absorbs the residual heat of the recycle water, it enters the evaporator of the water source heat pump through the circulation pump and continues to participate in the next cycle.

[0068] Monitoring and control stage: During the entire treatment process, the system uses a variety of sensors for real-time monitoring. Temperature and pressure sensors (using armored PT100 thermal resistors) installed on the sewage water supply and return main pipes, the reclaimed water supply and return main pipes, and the heat medium water supply and return main pipes are used to monitor water temperature and pressure changes; the electromagnetic flowmeter on the water supply main measures the water flow; the ultrasonic level meter in the sewage and reclaimed water lifting pump room 6 controls the start and stop of the submersible pump; the temperature detection wireless transmitter in each group of pools in the biochemical pool 4 synchronously detects the water temperature. The monitoring system consists of a monitoring station, a PLC control station, and a communication network. The PLC control station is located on-site in the temperature-raising workshop. The communication uses FrofiNet as the backbone network, and the network communication medium is optical fiber. The monitoring station communicates data with the on-site PLC control station through the communication network to realize the functions of monitoring and control of the entire process, data acquisition, equipment status display, fault alarm processing, parameter setting, and remote operation control.

[0069] Operation control strategy: When the temperature sensor of the sewage water supply main pipe monitors that the raw water temperature is greater than 11°C, the water source heat pump system is stopped, and the raw water directly passes through the coarse screen 1, the raw water lifting pump room 2, the fine screen 3, the biochemical pool 4, the secondary sedimentation tank 5, the reclaimed water lifting pump room 6, and the contact pool 7 in sequence to complete the sewage treatment process, and the sewage temperature is monitored at any time in the biochemical pool 4. If the temperature of the biochemical pool 4 decreases, the temperature increase process is started. In addition, when the water source heat pump system is running, by monitoring the flow in the sewage and reclaimed water supply main pipes, if the flow decreases, it means that the heat exchanger may be blocked. At this time, the conversion valve is switched in time to overhaul the sewage and reclaimed water heat exchanger 10. After the overhaul is completed, the conversion valve is switched again to start the water source heat pump system to ensure stable operation of the system. Specific implementation method:

[0071] 1. The sewage treated by the coarse screen 1 has a water temperature of 8°C and enters the raw water lift pump room 2. It is transported to the sewage heat exchanger 8 by the pressure of the raw water lift pump. After being heated to 12°C, it becomes hot grey water and is sent back to the fine screen 3. After passing through the biochemical pool 4 and the secondary sedimentation tank 5, it enters the grey water lift pump room 6. Water is taken from the grey water lift pump room 6 and transported to the grey water heat exchanger 10 by the pressure of the grey water lift pump. It is used as the low-level heat source of the water source heat pump to extract the waste heat of the grey water and then discharged to the contact pool 7.

[0072] 2. The cold intermediate water passes through the evaporator to transfer heat to the heat pump refrigerant. The refrigerant passes through the throttle valve to condense and release heat to form hot intermediate water. The hot intermediate water passes through the sewage heat exchanger 8 to transfer heat to the sewage. After transferring heat to the raw water, the hot intermediate water circulates back to the condenser. The water source heat pump that extracts the waste heat of the reclaimed water inputs the hot intermediate water into the sewage heat exchanger 8 to exchange heat with the raw water, thereby raising the temperature of the raw water.

[0073] 3. After the raw water passes through the coarse screen 1, the larger impurities in the raw water are intercepted, so that the impurities in the water entering the sewage heat exchanger 8 are small and fine. At the same time, the sewage heat exchanger 8 adopts a wide channel type and will not block the heat exchanger flow channel.

[0074] 4. The calculation formulas required for the implementation process are:

[0075] The heat required for heat exchange of sewage is: Q = CM (t2-t1); the average logarithmic temperature difference of heat transfer (countercurrent): ΔTm = (ΔT1-ΔT2) / ln (ΔT1 / ΔT2); the heat transfer area of ​​the heat exchanger: S = Q / KΔTm

[0076] A conversion valve is set in the system to control the operation of the sewage heating system.

[0077] 5. Common operation control methods are as follows:

[0078] The first one is that when the temperature sensor of the sewage water supply main monitors that the raw water temperature is greater than 11°C, the water source heat pump system is stopped, and the raw water passes through the coarse screen 1, the raw water lift pump room 2, the fine screen 3, the biochemical pool 4, the secondary sedimentation tank 5, the reclaimed water lift pump room 6, and the contact pool 7 in sequence to complete the sewage treatment process, and the sewage temperature is monitored at any time in the biochemical pool 4. If the temperature of the biochemical pool 4 drops, the second control method is started.

[0079] The second type is that when the temperature sensor of the sewage water supply main monitors that the raw water temperature is less than or equal to 11°C, the conversion valve is started to transport the sewage from the raw water lift pump room 2 to the sewage heat exchanger 8. At the same time, the water source heat pump unit 9 is started, and the hot intermediate water is transported from the condenser to the sewage heat exchanger 8 through the circulating pump to exchange heat with the raw water. The temperature of the sewage return water main temperature sensor is monitored to ensure that the raw water temperature is above 12°C. The heated raw water is sent back to the fine screen 3, and passes through the biochemical pool 4, the secondary sedimentation tank 5, and the reclaimed water lift pump room 6 in turn. Water is taken from the reclaimed water lift pump room 6 and transported to the reclaimed water heat exchanger 10 for heat exchange with the cold intermediate water. The cold intermediate water after heat exchange enters the water source heat pump evaporator through the circulating pump. At the same time, the reclaimed water after heat exchange is discharged to the contact tank 7. The water source heat pump system should implement interlocking start and stop control. The sequence requirements for normal start and stop of the water source heat pump system are as follows:

[0080] Normal startup sequence: switch the conversion valve - start the cold medium circulation pump - delay the start of the hot medium circulation pump - delay the start of the water source heat pump unit 9.

[0081] Normal stopping sequence: shut down the water source heat pump unit 9 - delay shutting down the hot medium circulation pump - delay shutting down the cold medium circulation pump - switch the conversion valve.

[0082] The third is that when the water source heat pump system is running, the heat exchanger is easily blocked due to impurities in the sewage. By monitoring the flow in the sewage and grey water supply main pipe, if the flow decreases, the conversion valve should be switched in time to overhaul the sewage and grey water heat exchanger 10. After the overhaul is completed, the conversion valve is switched to start the water source heat pump system.

[0083] Specific implementation process:

[0084] The treatment scale of a municipal sewage treatment plant is 15000m3 / d. Considering the comprehensive variation coefficient of 1.6, the maximum sewage volume is 1000m3 / h. The raw water temperature is 8℃, and the design heating temperature is 12℃. The heat required for heat exchange sewage is Q=4666kW.

[0085] The hot water outlet temperature of the water source heat pump is 45°C, and the return water temperature is 40°C. According to the formula ΔTm=(ΔT1-ΔT2) / ln(ΔT1 / ΔT2), it can be calculated that the average logarithmic temperature difference of heat transfer (countercurrent) ΔTm=32.5.

[0086] According to the heat transfer rate equation, Q = KSΔTm, where the heat transfer coefficient K of the sewage heat exchanger 8 is 1000W / ㎡℃, the heat transfer area S1 of the sewage heat exchanger 8 can be calculated to be 143㎡.

[0087] Considering the efficiency and cleaning of the sewage heat exchanger 8, three wide channel sewage heat exchangers 8 (2 in use and 1 in reserve) are selected, and the effective heat exchange area of ​​each unit is 100㎡. The main parameters of each unit are: rated heat exchange capacity 1200kW, heat exchange temperature difference 5℃, and heat exchange area 100㎡.

[0088] The hot fluid inlet temperature of the reclaimed water heat exchanger 10 is 12℃, and the outlet temperature is 7.5℃; the cold fluid inlet temperature is 4℃, and the outlet temperature is 8℃. The heat transfer coefficient K of the reclaimed water heat exchanger 10 is 4000W / ㎡℃. After calculation, the heat exchange area S2 of the reclaimed water heat exchanger 10 is 350㎡. It is planned to select 2 plate heat exchangers. The parameters of a single device are: rated heat exchange capacity 1600kW, heat exchange temperature difference 5℃, and heat exchange area 200㎡.

[0089] The heat required for heat exchange sewage is 4666kW. Two water source heat pumps are selected with the following equipment parameters: rated heating capacity 2500kW, full load input power 500KW, hot water flow 112l / s, hot water pressure drop 70kPa, cold water flow 66l / s, cold water pressure drop 41kPa.

[0090] Evaporator temperature 4 / 8℃, condenser temperature 45 / 40℃.

[0091] Three circulating pumps are set between the reclaimed water heat exchanger 10 and the water source heat pump 9, and between the sewage heat exchanger 8 and the water source heat pump 9, all of which are 2 for use and 1 for standby, with variable frequency. The design parameters of a single circulating pump are a design flow rate of 550m3 / h, a head of 12m, and a motor power of 30KW.

[0092] The raw water intake pipeline and the return water pipeline are both made of spiral welded steel pipes, with internal and external anti-corrosion treatment. The pipeline flow rate is 0.9m / s, and the pipe diameter is DN600, that is, D630x9 spiral welded steel pipe.

[0093] The water intake and return pipes of the recycled water are made of spiral welded steel pipes, and the internal and external anti-corrosion treatment is strengthened. The heat medium water and recycled water supply pipes are insulated with polyurethane, with a thickness of 60mm, and a PVC protective layer is set on the outside of the pipe. The flow rate of the pipe is 1.3m / s, and the pipe diameter is DN500, that is, D530x9 spiral welded steel pipe.

[0094] The total estimated investment of this implementation plan is RMB 23.5 million, of which RMB 18 million is for construction and installation. The sewage heating scale is 15,000 m3 / d, and considering the comprehensive variation coefficient of 1.6, the maximum sewage volume is 1,000 m3 / d.

[0095] / h, the temperature needs to be raised for 100 days, the electricity consumption is 1.176 million kWh, the electricity consumption per ton of water is 0.49 kWh / m3, the cost per ton of water is 0.28 yuan / m3, which is converted into standard coal as 605tce / a.

[0096] In one embodiment, the water source heat pump system for sewage heating in the present application can efficiently utilize the waste heat of grey water, improve the overall energy efficiency, reduce dependence on fossil energy, and reduce pollution emissions. It has high safety, excellent energy efficiency ratio, and better performance than air source heat pumps. Indirect heat exchange stabilizes the sewage quality, reduces the temperature of discharged grey water, and reduces disturbance to residents. It is also highly automated and can be remotely controlled from the central control room.

[0097] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0098] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0099] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0100] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0101] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0102] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0103] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0104] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0105] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A water source heat pump system for sewage heating, characterized in that: Including coarse screen, raw water lifting pump room, fine screen, biochemical pool, secondary sedimentation tank, reclaimed water lifting pump room, contact pool, sewage heat exchanger, reclaimed water heat exchanger, water source heat pump unit; The coarse grid is connected to the raw water lifting pump room, and the raw water lifting pump room is respectively connected to the sewage heat exchanger and the fine grid; The fine grid is connected to the biochemical pool, the secondary sedimentation tank, the reclaimed water lift pump room, the contact tank in sequence, and is also connected to the sewage heat exchanger; The water source heat pump unit is connected to the sewage heat exchanger and the grey water heat exchanger respectively; The grey water heat exchanger is connected to the contact tank and the grey water lifting pump room respectively.

2. The system according to claim 1, characterized in that The water source heat pump unit comprises: Evaporators, condensers, compressors and expansion valves are used to utilize low-grade thermal energy resources in sewage and realize the transfer of low-grade thermal energy to high-grade thermal energy through a small amount of high-grade electrical energy input; The evaporator outlet is connected to the compressor intake port, the compressor exhaust port is connected to the condenser inlet, the condenser outlet is connected to the expansion valve inlet, and the expansion valve outlet is connected back to the evaporator inlet to form a refrigerant circulation passage.

3. The system according to claim 1, characterized in that The system further comprises: Temperature and pressure sensors are respectively arranged on the preset sewage water supply and return main pipe, the preset grey water supply and return main pipe and the preset heat medium water supply and return main pipe, and the temperature sensor adopts armored PT100 thermal resistor.

4. The system according to claim 1, characterized in that The system further comprises: A water inlet metering device is provided on the preset water supply main.

5. The system according to claim 1, characterized in that The system further comprises: Ultrasonic level meters are installed in sewage and reclaimed water lift pump rooms to control the start and stop of submersible pumps.

6. The system according to claim 1, characterized in that The system further comprises: A temperature detection wireless transmitter is provided in each group of pool bodies of the biochemical pool.

7. The system according to claim 1, characterized in that The system further comprises: Monitoring system; The monitoring system is composed of a monitoring station, a PLC control station and a communication network.

8. The system according to claim 1, characterized in that The sewage heat exchanger adopts a wide channel type.

9. The system according to claim 1, characterized in that The system further comprises: A conversion valve, wherein the conversion valve is used to control the operation of the sewage heating system.

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