Heat supply system of high-temperature sewage source heat pump

Abstract

The utility model discloses a high-temperature sewage source heat pump heat supply system which comprises a water segregator, a water collector, a high-temperature heat exchange system, a low-temperature sewage source large-temperature-difference heat extraction system and a remote control cabinet, the high-temperature heat exchange system comprises a high-temperature sewage pool, a plate heat exchanger and a sewage return pool, and the low-temperature sewage source large-temperature-difference heat extraction system comprises a heat pump unit. The heat pump unit comprises an evaporator, a compressor, a condenser and a throttle valve. When the temperature requirement of the heat supply tail end is low, heat is directly exchanged through the plate heat exchanger and the tail end heat supply system, and heat is provided for the tail end heat supply system. When the requirement for the temperature of the heat supply tail end is high, the plate heat exchanger supplies heat to the tail end heat supply system, meanwhile, high-temperature sewage with the temperature reduced after primary heat exchange is provided for the heat pump unit through the three-way adjusting valve, the heat pump unit achieves large-temperature-difference heat extraction of a sewage heat source and supplies heat to the tail end heat supply system, the utilization rate of the sewage heat source is increased, and the energy consumption is reduced. And the requirement for diversity of outlet water temperature at the tail end of a heat supply system is met.

Description

Technical Field

[0001] This utility model relates to the field of industrial waste heat recovery and utilization technology, specifically a high-temperature sewage source heat pump heating system. Background Technology

[0002] Wastewater source heat pump technology absorbs heat from a low-grade heat source and releases it to a high-grade heat source by consuming a small amount of electricity. It is applied in heating and cooling, industrial waste heat recovery, and other fields. The aim is to improve energy efficiency, reduce dependence on traditional energy sources, and reduce environmental pollution.

[0003] Currently, there are two types of wastewater source heat pump technology: indirect and direct. Indirect wastewater source heat pumps use an intermediate heat exchanger between the wastewater heat extraction circuit and the heat pump circuit. Direct wastewater source heat pumps place the heat pump evaporator in the wastewater and directly absorb heat from the wastewater using refrigerant. In practice, neither of these systems can efficiently extract heat from the wastewater to meet the diverse temperature requirements of the outlet water at the end of the heating system, resulting in a waste of the wastewater heat source. Utility Model Content

[0004] The purpose of this invention is to provide a high-temperature sewage source heat pump heating system that extracts heat in stages through a plate heat exchanger and sewage source heat pump unit, thereby meeting the diverse needs of the outlet water temperature at the end of the heating system, improving the utilization rate of sewage heat source, and achieving energy saving and environmental protection.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A high-temperature sewage source heat pump heating system includes a water distributor and a water collector. The water distributor is connected to the inlet pipe of the terminal radiator through a heating water supply pipe, and the return water pipe of the terminal radiator is connected to the water collector through a heating return water pipe. The system also includes a high-temperature heat exchange system, a low-temperature sewage source large temperature difference heat extraction system, and a remote control cabinet. The high-temperature heat exchange system includes an interconnected high-temperature sewage tank, a plate heat exchanger, and a sewage return water tank. The low-temperature sewage source large temperature difference heat extraction system includes a heat pump unit, which includes an evaporator, a compressor, a condenser, and a throttling valve.

[0007] The high-temperature wastewater tank is connected to the heat medium inlet of the plate heat exchanger via a high-temperature wastewater pipeline. The heat medium outlet of the plate heat exchanger is connected to the wastewater return tank via the main wastewater return pipeline. The low-temperature medium inlet of the plate heat exchanger is connected to the water collector via the circulating water pipeline at the heating terminal. The low-temperature medium outlet of the plate heat exchanger is connected to the inlet of the condenser via a pipeline. The outlet of the condenser is connected to the water distributor. Temperature sensors are installed at both the low-temperature medium inlet and outlet of the plate heat exchanger.

[0008] A three-way regulating valve is installed on the main sewage return pipeline. The third port of the three-way regulating valve is connected to the inlet of the evaporator through the sewage return pipeline. The outlet of the evaporator is connected to the sewage return pool through the main sewage return pipeline. A compressor and a throttling valve are installed on the refrigerant pipeline connecting the evaporator and the condenser.

[0009] The three-way regulating valve, compressor, and temperature sensor are all electrically connected to the remote control cabinet.

[0010] Preferably, a circulating water pump and a check valve are installed on the connecting pipe between the low-temperature medium outlet of the plate heat exchanger and the condenser, and the circulating water pump is electrically connected to the remote control cabinet.

[0011] Preferably, a comprehensive water treatment device is installed on the connecting pipe between the condenser and the water distributor.

[0012] Preferably, a sewage pump and a desiccant are installed on the high-temperature sewage pipeline that connects the high-temperature sewage tank to the plate heat exchanger, and the sewage pump is electrically connected to the remote control cabinet.

[0013] Preferably, the circulating water pipe at the heating terminal is connected to the soft water tank, and a constant pressure water supply pump is installed on the connecting pipe. The constant pressure water supply pump is electrically connected to the remote control cabinet.

[0014] Preferably, a differential pressure regulator is installed between the heating supply water pipe and the heating return water pipe.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] (1) This utility model adopts a high-temperature heat exchange system and a low-temperature sewage source large temperature difference heat extraction system. When the temperature demand at the end of the heating supply is low, the plate heat exchanger directly extracts heat from the high-temperature sewage to provide heat to the end heating supply system. When the temperature demand at the end of the heating supply is high, while the plate heat exchanger provides heat to the end heating supply system, a three-way regulating valve provides the heat pump unit with high-temperature sewage that has been cooled after one heat exchange. The heat pump unit realizes large temperature difference heat extraction from the sewage source to provide heat to the end heating supply system, which greatly improves the utilization rate of sewage heat source. It can meet the diverse needs of the outlet water temperature at the end of the heating system, and is energy-saving and environmentally friendly.

[0017] (2) This utility model connects the three-way regulating valve, compressor and temperature sensor to the remote control cabinet. The operator can remotely control the opening of the three-way regulating valve and compressor by detecting the low temperature medium inlet and outlet water temperature through the temperature sensor, so as to ensure the temperature of the terminal heating system and realize remote unmanned operation and automation of the heating system. The outlet water temperature of the heating terminal can be flexibly set according to the weather at multiple times by associating with the outdoor air temperature, so as to realize automatic adjustment and control of the heating terminal temperature.

[0018] (3) The heat pump unit in this utility model includes an evaporator, a compressor, a condenser and a throttling valve. When the heat pump unit is running, the refrigerant works as follows: compressor → condenser → throttling valve → evaporator → compressor cycle. During operation, the refrigerant evaporates on the evaporator side to absorb heat from the sewage, and on the condenser side, the refrigerant releases heat to the terminal heating system. The heat pump unit increases the heat transported by the heating circulating water system network by taking heat through a large temperature difference. Under the condition that the heat supply on the sewage side remains unchanged, the investment in the heating circulating water system network is reduced, and energy saving and emission reduction are achieved.

[0019] (4) This utility model installs a dirt remover on the high-temperature sewage tank and a comprehensive water treatment device on the connecting pipe between the condenser and the water distributor to prevent impurities and scale in the sewage from entering the heating system and to ensure the service life of the pipes and equipment.

[0020] (5) In this utility model, the circulating water pipe at the heating terminal is connected to the soft water tank, and a constant pressure water supply pump is installed on the connecting pipe to ensure the water pressure of the circulating system at the heating terminal and realize the safe and stable operation of the circulating water system.

[0021] (6) This utility model installs a differential pressure regulator between the heating water supply pipe and the heating return pipe to solve the problem of pressure fluctuation in the circulating water pipeline and realize the safe and stable operation of the circulating water system. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the present invention;

[0023] In the diagram: 1. High-temperature sewage tank; 2. Sewage pump; 3. High-temperature sewage pipe; 3-1. Main sewage return pipe; 3-2. Sewage return water pipe; 4. Strainer; 5. Plate heat exchanger; 6. Three-way regulating valve; 7. Evaporator; 8. Compressor; 9. Sewage return water tank; 10. Remote control cabinet; 11. Water distributor; 12. Heating water supply pipe; 13. Heating return water pipe; 14. Water collector; 15. Integrated water treatment unit; 16. Condenser; 17. Heating terminal circulating water pipe; 18. Throttling valve; 19. Heat pump unit; 20. Temperature sensor; 21. Circulating water pump; 22. Check valve; 23. Constant pressure water supply pump; 24. Soft water tank. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings.

[0025] like Figure 1The high-temperature sewage source heat pump heating system shown includes a water distributor 11 and a water collector 14. The water distributor 11 is connected to the inlet water pipe of the terminal radiator through a heating water supply pipe 12. The return water pipe of the terminal radiator is connected to the water collector 14 through a heating return water pipe 13. The system also includes a high-temperature heat exchange system, a low-temperature sewage source large temperature difference heat extraction system, and a remote control cabinet 10. The high-temperature heat exchange system includes an interconnected high-temperature sewage tank 1, a plate heat exchanger 5, and a sewage return water tank 9. The low-temperature sewage source large temperature difference heat extraction system includes a heat pump unit 19, which includes an evaporator 7, a compressor 8, a condenser 16, and a throttling valve 18.

[0026] The high-temperature wastewater tank 1 is connected to the heat medium inlet of the plate heat exchanger 5 via the high-temperature wastewater pipe 3. The heat medium outlet of the plate heat exchanger 5 is connected to the wastewater return tank 9 via the wastewater return main pipe 3-1. The low-temperature medium inlet of the plate heat exchanger 5 is connected to the water collector 14 via the heating terminal circulating water pipe 17. The low-temperature medium outlet of the plate heat exchanger 5 is connected to the inlet of the condenser 16 via a pipe. The outlet of the condenser 16 is connected to the water distributor 11. Temperature sensors 20 are installed at both the low-temperature medium inlet and outlet of the plate heat exchanger 5.

[0027] A three-way regulating valve 6 is installed on the main sewage return pipe 3-1. The third port of the three-way regulating valve 6 is connected to the inlet of the evaporator 7 through the sewage return water pipe 3-2. A compressor 8 and a throttle valve 18 are installed on the refrigerant pipe connecting the evaporator 7 and the condenser 16. The outlet of the evaporator 7 is connected to the sewage return water tank 9 through the main sewage return water pipe 3-1.

[0028] The three-way regulating valve 6, compressor 8, and temperature sensor 20 are all electrically connected to the remote control cabinet 10.

[0029] A circulating water pump 21 and a check valve 22 are installed on the connecting pipe between the low-temperature medium outlet of the plate heat exchanger 5 and the condenser 16. The circulating water pump 21 is electrically connected to the remote control cabinet 10.

[0030] A comprehensive water treatment device 15 is installed on the connecting pipe between the condenser 16 and the water distributor 11.

[0031] A sewage pump 2 and a dirt remover 4 are installed on a high-temperature sewage pipe 3 that connects the high-temperature sewage tank 1 to the plate heat exchanger 5. The sewage pump 2 is electrically connected to the remote control cabinet 10.

[0032] The circulating water pipe 17 at the heating terminal is connected to the soft water tank 24. A constant pressure water supply pump 23 is installed on the connecting pipe and is electrically connected to the remote control cabinet 10.

[0033] A differential pressure regulator is installed between the heating water supply pipe 12 and the heating return pipe 13.

[0034] The working process of this utility model is as follows:

[0035] When the outdoor temperature is high and the temperature demand at the heating terminal is low, the third outlet of the remote control three-way regulating valve 6 is closed, the sewage pump 2 is started, and the high-temperature sewage flows to the sewage return pool 9 after exchanging heat once with the low-temperature heating circulating water through the plate heat exchanger 5, thus meeting the end-point heating demand.

[0036] When the outdoor temperature is low and the heating terminal temperature demand is high, the opening of the third outlet of the three-way regulating valve 6 and the compressor 8 is remotely controlled based on the temperature of the heating circulating water detected by the temperature sensor 20. The high-temperature sewage, which has been cooled down after the first heat exchange, flows through the evaporator 7. The evaporator 7 then extracts heat from the high-temperature sewage, which has been cooled down after the first heat exchange. During heat extraction, the low-temperature, low-pressure gaseous refrigerant of the heat pump unit is compressed by the compressor 8 into a high-temperature, high-pressure gaseous refrigerant. After releasing heat in the condenser 16, the high-temperature, high-pressure gaseous refrigerant cools down and becomes a high-pressure, low-temperature liquid refrigerant. After passing through the throttling valve 18, it becomes a two-phase gas-liquid refrigerant. After absorbing heat again through the evaporator 7, it becomes a gaseous refrigerant and returns to the inlet of the compressor 8 for repeated compression and recirculation. During the operation of the heat pump unit 19, the refrigerant evaporates on the evaporator side, absorbing heat from the sewage, and releases heat to the heating circulating water system on the condenser side, thus meeting the high-temperature heating demand at the heating terminal.

[0037] This invention employs a high-temperature heat exchange system and a low-temperature wastewater source with a large temperature difference for heat extraction. When the temperature demand at the heating terminal is low, the plate heat exchanger directly extracts heat from the high-temperature wastewater to provide heat to the terminal heating system. When the temperature demand at the heating terminal is high, while the plate heat exchanger is supplying heat to the terminal heating system, a three-way regulating valve provides the heat pump unit with low-temperature wastewater after a primary heat exchange. The heat pump unit achieves high-temperature wastewater source with a large temperature difference for heat extraction to supply heat to the terminal heating system, greatly improving the utilization rate of the wastewater heat source and reducing the unit's operating rate. It can meet the diverse needs of the heating system's terminal outlet water temperature, and is energy-saving and environmentally friendly.

[0038] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, other equivalent modifications and improvements can be made under the technical guidance provided by this utility model, and these should also be considered within the scope of protection of this utility model.

Claims

1. A high-temperature sewage source heat pump heating system, comprising a distributor (11) and a collector (14), wherein the distributor (11) is connected to the inlet pipe of the terminal radiator via a heating supply water pipe (12), and the return water pipe of the terminal radiator is connected to the collector (14) via a heating return water pipe (13), characterized in that: It also includes a high-temperature heat exchange system, a low-temperature sewage source large temperature difference heat extraction system and a remote control cabinet (10). The high-temperature heat exchange system includes an interconnected high-temperature sewage tank (1), a plate heat exchanger (5) and a sewage return tank (9). The low-temperature sewage source large temperature difference heat extraction system includes a heat pump unit (19). The heat pump unit (19) includes an evaporator (7), a compressor (8), a condenser (16) and a throttle valve (18). The high-temperature sewage tank (1) is connected to the heat medium inlet of the plate heat exchanger (5) through the high-temperature sewage pipe (3). The heat medium outlet of the plate heat exchanger (5) is connected to the sewage return tank (9) through the sewage return main pipe (3-1). The low-temperature medium inlet of the plate heat exchanger (5) is connected to the water collector (14) through the heating terminal circulating water pipe (17). The low-temperature medium outlet of the plate heat exchanger (5) is connected to the inlet of the condenser (16) through the pipe. The outlet of the condenser (16) is connected to the water distributor (11). Temperature sensors (20) are installed at both the low-temperature medium inlet and the low-temperature medium outlet of the plate heat exchanger (5). A three-way regulating valve (6) is installed on the main sewage return pipeline (3-1). The third port of the three-way regulating valve (6) is connected to the inlet of the evaporator (7) through the sewage return pipeline (3-2). The heat pump unit (19) is connected to the evaporator (7), compressor (8), condenser (16) and throttle valve (18) on the refrigerant pipeline. The outlet of the evaporator (7) is connected to the sewage return pool (9) through the main sewage return pipeline (3-1). The three-way regulating valve (6), compressor (8) and temperature sensor (20) are all electrically connected to the remote control cabinet (10).

2. The heating system according to claim 1, characterized in that: A circulating water pump (21) and a check valve (22) are installed on the connecting pipe between the low-temperature medium outlet of the plate heat exchanger (5) and the condenser (16). The circulating water pump (21) is electrically connected to the remote control cabinet (10).

3. The heating system according to claim 1, characterized in that: A comprehensive water treatment device (15) is installed on the connecting pipe between the condenser (16) and the water distributor (11).

4. The heating system according to claim 1, characterized in that: The high-temperature sewage tank (1) is connected to the plate heat exchanger (5) and the high-temperature sewage pipe (3) is equipped with a sewage pump (2) and a dirt remover (4). The sewage pump (2) is electrically connected to the remote control cabinet (10).

5. The heating system according to claim 1, characterized in that: The circulating water pipe (17) at the heating terminal is connected to the soft water tank (24), and a constant pressure water supply pump (23) is installed on the connecting pipe. The constant pressure water supply pump (23) is electrically connected to the remote control cabinet (10).

6. The heating system according to claim 1, characterized in that: A differential pressure regulator is installed between the heating water supply pipe (12) and the heating return pipe (13).

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