A shallow ground-source coupled sewage-source heat pump integrated energy system and its operation method

Abstract

This invention provides a shallow geothermal coupled sewage source heat pump integrated energy system and its operation method, belonging to the field of comprehensive energy utilization technology. It includes: a heat pump energy supply module, a shallow geothermal energy supply module, a sewage energy supply module, an electric refrigeration module, a thermal storage device, heat users, and cold users. Through heat pump and electric refrigeration unit technology, shallow geothermal energy and sewage source heat energy are extracted and enhanced, converted into energy for building heating and cooling. In winter, heat is extracted from shallow geothermal energy and sewage, and the heat pump raises the temperature of the heat before supplying it to the building's interior for heating. In summer, indoor heat is transferred to the shallow geothermal layer and sewage to achieve a cooling effect. This method, through measurement and control of the temperature of shallow geothermal water, sewage, and circulating cooling water of the electric refrigeration unit, achieves priority sequencing of the operation of multiple devices in the integrated energy system, providing multiple economical energy supply operation modes, ensuring efficient system operation, and improving the economic efficiency of integrated energy projects by 5%-10%.

Description

Technical Field

[0001] This invention relates to the field of comprehensive energy utilization technology, and in particular to a shallow ground source coupled sewage source heat pump integrated energy system and its operation method. Background Technology

[0002] Traditional heating, cooling, and hot water supply systems often rely on a single energy source. Ordinary air conditioners consume a lot of energy during cooling or heating, especially under extreme weather conditions, where their energy efficiency ratio drops significantly, increasing user costs and energy consumption.

[0003] Meanwhile, shallow geothermal energy, as a renewable and clean energy source, is widely found in the shallow layers of the Earth's surface (generally less than 400 meters). Its temperature is relatively stable, higher than ambient air temperature in winter and lower than ambient air temperature in summer, possessing enormous development and utilization potential. Furthermore, urban sewage contains abundant heat; sewage source heat is stable and plentiful, belonging to low-grade heat energy. If shallow geothermal energy and sewage source heat energy can be effectively coupled and utilized to develop an integrated energy system, the advantages of both can be fully leveraged.

[0004] This invention proposes a shallow geothermal coupled sewage source heat pump integrated energy system and its operation method. Through heat pump and electric refrigeration unit technology, shallow geothermal energy and sewage source heat energy are extracted, enhanced and converted for building heating and cooling. Summary of the Invention

[0005] The purpose of this invention is to provide a shallow ground-source coupled sewage-source heat pump integrated energy system and its operation method, which can solve the system configuration problem of multiple energy coupled heating such as shallow geothermal, sewage waste heat, and electric refrigeration units.

[0006] On the one hand, the present invention provides a shallow geothermal coupled sewage source heat pump integrated energy system, including: a heat pump energy supply module, a shallow geothermal energy supply module, a sewage energy supply module, an electric refrigeration module, a cold and heat storage device, a heat user and a cold user;

[0007] The heat pump power supply module includes a first heat pump heat exchanger, a heat pump compressor, a second heat pump heat exchanger and a heat pump throttling device that are connected in sequence to form a closed loop. The second heat pump heat exchanger is connected to the cold and heat storage device, and the second heat pump heat exchanger is bidirectionally connected to both the heat user and the cold user.

[0008] The shallow geothermal energy supply module includes a shallow geothermal well, a shallow ground source water supply pump valve group, a geothermal water temperature sensor, and a shallow ground source return water pump valve group connected in sequence. The shallow ground source water supply pump valve group is connected to the inlet of the first heat pump heat exchanger through the geothermal water temperature sensor. The shallow ground source return water pump valve group is connected to the outlet of the first heat pump heat exchanger. The geothermal water in the shallow geothermal well is circulated to the first heat pump heat exchanger for heat exchange under the action of the shallow ground source water supply pump valve group. The return water flows back to the shallow geothermal well under the action of the shallow ground source return water pump valve group.

[0009] The wastewater power supply module includes a wastewater trunk pipe, a wastewater source water supply pump valve group, a wastewater treatment equipment, a wastewater source side heat exchanger, a hot water exchange temperature sensor, and a wastewater source return water pump valve group connected in sequence. The hot water exchange temperature sensor is connected to the inlet of the first heat pump heat exchanger, and the outlet of the first heat pump heat exchanger is connected to the wastewater source side heat exchanger. Raw water enters the wastewater treatment equipment as treated reclaimed water under the action of the wastewater source water supply pump valve group. After entering the wastewater source side heat exchanger and exchanging heat with the hot water, it flows back to the wastewater trunk pipe under the action of the wastewater source return water pump valve group. Part of the hot water is sent to the first heat pump heat exchanger for secondary heat exchange, and the other part is sent to the electric cooling module. The return water after secondary heat exchange flows back to the wastewater source side heat exchanger for heat exchange to complete the hot water circulation.

[0010] The electric refrigeration and cooling module includes an electric refrigeration unit, a cooling water temperature sensor, and a cooling tower that are connected in sequence to form a closed loop. Another part of the hot water is exchanged in the heat exchanger on the sewage source side and then supplied to the electric refrigeration unit. The electric refrigeration unit is connected to the cold and heat storage module and the cold user.

[0011] The aforementioned cold and heat storage device is used for energy storage and is connected to both heat users and cold users, providing heat to heat users and cooling to cold users.

[0012] Preferably, the shallow geothermal water supply pump valve assembly is connected to the shallow geothermal well via a shallow geothermal water supply diverter, and the shallow geothermal water supply pump valve assembly is connected to the geothermal water temperature sensor via a shallow geothermal water supply manifold; the outlet of the first heat pump heat exchanger is connected to the shallow geothermal return water pump valve assembly via a shallow geothermal return water diverter, and the shallow geothermal return water pump valve assembly is connected to the shallow geothermal well via a shallow geothermal return water manifold.

[0013] Preferably, the sewage source water supply pump valve group is connected to the sewage trunk line via a raw water supply diverter, and the sewage source water supply pump valve group is connected to the sewage treatment equipment via a raw water supply manifold.

[0014] The outlet of the first heat pump heat exchanger is connected to the sewage source return water pump valve group through the sewage source side heat exchanger. The sewage source return water pump valve group is connected to the sewage trunk line via a reclaimed water return water manifold. The sewage source return water pump valve group is connected to the outlet of the sewage source side heat exchanger via a reclaimed water return water diverter.

[0015] Preferably, the wastewater treatment equipment is connected to the wastewater source heat exchanger via a reclaimed water intake pump, and the hot water temperature sensor is connected to the first heat pump heat exchanger via a hot water supply pump. The hot water supply pump is connected to the inlet of the first heat pump heat exchanger via a hot water supply distributor and an electric valve, and the hot water supply distributor is connected to the inlet of the electric refrigeration unit via an electric valve.

[0016] Preferably, the outlet of the first heat pump heat exchanger is connected to the wastewater source-side heat exchanger via a hot water return manifold and a hot water return pump, and the outlet of the electric refrigeration unit is connected to the hot water return manifold.

[0017] Preferably, the electric chiller unit is connected to the cooling water temperature sensor via an electric valve and a circulating cooling water supply pump, and the cooling tower is connected to the electric chiller unit via a circulating cooling water return pump.

[0018] Preferably, the refrigerant water outlet of the electric chiller unit is connected to the cold and heat storage device and the cold user respectively through the electric chiller unit water supply pump and the refrigerant water outlet distributor, and an electric valve is connected between the refrigerant water outlet distributor and the cold and heat storage device and the cold user respectively. The cold user is connected to the electric chiller unit through the electric chiller unit return water pump.

[0019] Preferably, the heat medium water outlet of the second heat pump heat exchanger is connected to a heat pump unit water supply pump. The heat pump unit water supply pump is connected to the cold and heat storage device, the heat user, and the cold user respectively through a heat pump power supply distributor and three electric valves. The heat user and the cold user are connected to the return water port of the second heat pump heat exchanger through a heat pump power supply return water manifold and a heat pump unit return water pump.

[0020] Preferably, the cold and heat storage device is an energy storage water tank, and the outlet of the cold and heat storage device is connected to an energy storage water tank water supply pump. The energy storage water tank water supply pump is connected to the heat user and the cold user respectively through an energy storage water tank power supply distributor and two electric valves.

[0021] On the other hand, the present invention provides an operation method for the above-mentioned system. Based on the geothermal water temperature T1 measured by the geothermal water temperature sensor, the hot water exchange temperature T2 measured by the wastewater hot water temperature sensor, and the circulating cooling water temperature T3 measured by the cooling water temperature sensor, the system has the following operating modes: heating mode, thermal storage mode, cooling mode, and thermal storage mode.

[0022] Heating operation mode: The electric refrigeration and cooling module is deactivated, and there are no cooling users. When T1 > T2, the shallow geothermal energy supply module is preferentially used for heating. At this time, the sewage energy supply module is closed. After the shallow geothermal water supply pump valve group is sequentially opened to the maximum, the geothermal water in the shallow geothermal well is pressurized by the shallow geothermal water supply pump valve group and sent to the first heat pump heat exchanger after the temperature is measured by the geothermal water temperature sensor to release heat. After heat exchange, the geothermal water is pressurized by the shallow geothermal return water pump valve group and returned to the shallow geothermal well to complete the geothermal water heat exchange cycle. Then, the sewage energy supply module is opened, and the sewage source water supply pump valve group is sequentially opened. The raw water in the sewage main pipe is pressurized by the sewage source water supply pump valve group and enters the sewage treatment equipment for purification. The treated reclaimed water is pressurized and flows into the sewage source side heat exchanger to release heat. After heat exchange, the reclaimed water is pressurized by the sewage source return water pump valve group and flows back to the sewage main pipe. The heat exchange water is measured for temperature by the heat exchange water temperature sensor, pressurized and transported to the first heat pump heat exchanger, releases heat in the first heat pump heat exchanger, and the secondary heat exchange water after heat exchange is pressurized and flows back to the sewage source side heat exchanger for heat exchange to complete the heat exchange water cycle. The shallow geothermal energy supply module and the sewage energy supply module are coupled to provide heat for the heat pump energy supply module; when T1 < T2, the sewage energy supply module is preferentially used for heating. At this time, the shallow geothermal energy supply module is closed. After the sewage source water supply pump valve group is sequentially opened to the maximum, the shallow geothermal energy supply module is then opened, and the shallow geothermal water supply pump valve group is sequentially opened. The sewage energy supply module and the shallow geothermal energy supply module are coupled as above to provide heat for the heat pump energy supply module; during heating, the heat pump working medium absorbs heat in the first heat pump heat exchanger, is compressed by the heat pump compressor, and the compressed working medium releases heat to the medium water in the second heat pump heat exchanger, is throttled and depressurized by the heat pump throttling device, and enters the first heat pump heat exchanger to absorb heat to complete the heat pump working medium cycle for heating. The heat medium water that exchanges heat in the second heat pump heat exchanger is transported to the heat user to release heat for heating; during the operation of this mode, the cold storage and heat storage device is used for peak regulation;

[0023] Heat storage operation mode: Heat is stored during the heating season. At this time, the electric refrigeration and cooling module is deactivated, and there are no cooling users. When T1 > T2, the shallow geothermal energy supply module is preferentially used for heating. At this time, the sewage energy supply module is closed. After the shallow geothermal source water supply pump valve group is opened to the maximum in sequence, the sewage energy supply module is then opened. The sewage source water supply pump valve group is opened in sequence. The shallow geothermal energy supply module and the sewage energy supply module are coupled as above to provide heat for the heat pump energy supply module. After the heat pump working medium circulates in the heat pump energy supply module as above, the heat medium water that exchanges heat in the second heat pump heat exchanger is distributed between the cold storage and heat storage device and the heat user for heat storage and heating; when T1 < T2, the sewage energy supply module is preferentially used. At this time, the shallow geothermal energy supply module is closed. After the sewage source water supply pump valve group is opened to the maximum in sequence, the shallow geothermal energy supply module is then opened. The shallow geothermal source water supply pump valve group is opened in sequence. The shallow geothermal energy supply module and the sewage energy supply module are coupled as above to provide heat for the heat pump energy supply module. After the heat pump working medium circulates in the heat pump energy supply module as above, the heat medium water that exchanges heat in the second heat pump heat exchanger is distributed between the cold storage and heat storage device and the heat user for heat storage and heating;

[0024] Cooling operation mode: At this time, the electric refrigeration cooling module is closed and there are no heat users. When T1 < T2, the shallow geothermal energy supply module is preferentially used for cooling. At this time, the sewage energy supply module is closed. After the shallow geothermal water supply pump valve group is sequentially opened to the maximum, the geothermal water in the shallow geothermal well is pressurized by the shallow geothermal water supply pump valve group and sent to the first heat pump heat exchanger to absorb heat after the temperature is measured by the geothermal water temperature sensor. The geothermal water after heat exchange is pressurized by the shallow geothermal return water pump valve group and then returned to the shallow geothermal well to complete the geothermal water heat exchange cycle. Then, the sewage energy supply module is opened, and the sewage source water supply pump valve group is sequentially opened. The raw water in the sewage main pipe is pressurized by the sewage source water supply pump valve group and then enters the sewage treatment equipment for purification. The treated reclaimed water is pressurized and flows into the sewage source side heat exchanger to absorb heat. The reclaimed water after heat exchange is pressurized by the sewage source return water pump valve group and flows back to the sewage main pipe. The heat exchange water is measured by the heat exchange water temperature sensor and then pressurized and transported to the first heat pump heat exchanger to absorb heat. The secondary heat exchange water after heat exchange is pressurized and then flows back to the sewage source side heat exchanger for heat exchange to complete the heat exchange water cycle. The shallow geothermal energy supply module and the sewage energy supply module are coupled to supply cooling for the heat pump energy supply module; when T1 > T2, the sewage energy supply module is preferentially used for cooling. At this time, the shallow geothermal energy supply module is closed. After the sewage source water supply pump valve group is sequentially opened to the maximum, the shallow energy supply module is then opened, and the shallow geothermal water supply pump valve group is sequentially opened. The sewage energy supply module and the shallow geothermal energy supply module are coupled to supply cooling for the heat pump energy supply module in the same way as above; during cooling, after the heat pump working medium releases heat in the first heat pump heat exchanger, it is throttled and depressurized by the heat pump throttling device and then absorbs heat in the second heat pump heat exchanger. After absorption, it is compressed by the heat pump compressor, and the compressed working medium enters the first heat pump heat exchanger to release heat to complete the heat pump working medium cycle for cooling; the medium water for heat exchange in the second heat pump heat exchanger is transported to the cold user to absorb heat for cooling; during the operation of this mode, the cold storage and heat storage device is used for peak regulation. When the peak regulation is insufficient, the electric refrigeration unit is started. The refrigerant water in the electric refrigeration unit is transported to the cold user for cooling and then transported back to the electric refrigeration unit after absorption to complete the refrigerant water refrigeration cycle; compare T2 and T3. When T2 is closer to the high-efficiency cooling area of the electric refrigeration unit, the secondary sewage heat exchange water is used to cool the electric refrigeration unit; when T3 is closer to the high-efficiency cooling area of the electric refrigeration unit, the circulating cooling water is used to cool the electric refrigeration unit. The circulating cooling water is pressurized and transported to the cooling water temperature sensor for temperature measurement and then enters the cooling tower for heat dissipation. The circulating cooling water after heat dissipation is transported back to the electric refrigeration unit to complete the circulating cooling water cycle;

[0025] Cool storage operation mode: Cool storage is carried out during the cooling season. At this time, the electric refrigeration cooling module is deactivated and there are no heat users. When T1 < T2, the shallow geothermal energy supply module is preferentially used for cooling. At this time, the sewage energy supply module is closed. After the shallow geothermal source water supply pump valve group is opened to the maximum in sequence, the sewage energy supply module is then opened. The sewage source water supply pump valve group is opened in sequence. The shallow geothermal energy supply module and the sewage energy supply module are coupled as the heat pump energy supply module for cooling as described above. After the heat pump working medium circulates in the heat pump energy supply module as described above, the chilled water for heat exchange in the second heat pump heat exchanger is distributed between the cool storage and heat storage device and the cold users for cool storage and cooling; when T1 > T2, the sewage energy supply module is preferentially used. At this time, the shallow geothermal energy supply module is closed. After the sewage source water supply pump valve group is opened to the maximum in sequence, the shallow geothermal energy supply module is then opened. The shallow geothermal source water supply pump valve group is opened in sequence. The shallow geothermal energy supply module and the sewage energy supply module are coupled as the heat pump energy supply module for cooling as described above. After the heat pump working medium circulates in the heat pump energy supply module as described above, the chilled water after heat exchange in the second heat pump heat exchanger is distributed between the cool storage and heat storage device and the cold users for cool storage and cooling; when the chilled water is insufficient, the electric refrigeration unit is started. The chilled water in the electric refrigeration unit is pressurized and then divided into two parts. One part is transported to the cold users for cooling, and after absorbing heat, it is transported back to the electric refrigeration unit to complete the chilled water refrigeration cycle. The other part is transported to the cool storage and heat storage device for storage; compare T2 and T3. When T2 is closer to the high-efficiency cooling area of the electric refrigeration unit, secondary sewage heat exchange water is used for cooling the electric refrigeration unit as described above; when T3 is closer to the high-efficiency cooling area of the electric refrigeration unit, the circulating cooling water is used to cool the electric refrigeration unit. The circulating cooling water is pressurized and transported to the cooling water temperature sensor, and after temperature measurement, it enters the cooling tower for heat dissipation. The heat-dissipated circulating cooling water is transported back to the electric refrigeration unit to complete the circulating cooling water cycle.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) This patent couples shallow geothermal energy, sewage waste heat, and the circulating cooling water of the electric refrigeration unit, and uses a heat pump, an electric refrigeration unit, and a cool storage and heat storage device to build an integrated energy system. In winter, the system extracts heat from shallow geothermal energy and sewage, and uses the heat pump to raise the temperature of the heat and supply it to the indoor heating of the building; in summer, the indoor heat is transferred to the shallow stratum and sewage to achieve a cooling effect, realizing cooling for cold users in summer and heating for heat users in winter, and providing multiple economical energy supply operation modes;

[0028] (2) The shallow geothermal source supply and return water pumps and the sewage source heat pump supply and return water pumps of the present invention adopt a valve group form. The valve group consists of several pumps and valves of the same model, and the number of pumps to be started can be flexibly selected according to the required sewage volume for transportation, so that the shallow geothermal energy and sewage waste heat can be used for peak shaving with each other, and the pump efficiency can operate near the optimal working condition, and the overall pump efficiency is increased by about 5%;

[0029] (3) The heat pump supply pump and return pump of the present invention adopt a common mode for cooling and heating, which reduces equipment redundancy and construction investment;

[0030] (4) By measuring and controlling the temperature of shallow geothermal water, sewage and circulating cooling water of electric chiller units, the priority of operation of multiple equipment in the integrated energy system can be sorted to ensure the efficient operation of the system and improve the economic efficiency of the integrated energy project by 5%-10%. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the shallow ground source coupled sewage source heat pump integrated energy system of the present invention;

[0033] Explanation of reference numerals in the attached figures:

[0034] 1: Shallow geothermal well; 2: Geothermal water temperature sensor; 3: Sewage trunk line; 4: Sewage treatment equipment; 5: Sewage source-side heat exchanger; 6: Hot water temperature sensor; 7: First heat pump heat exchanger; 8: Heat pump compressor; 9: Second heat pump heat exchanger; 10: Heat pump throttling device; 11: Electric refrigeration unit; 12: Cooling water temperature sensor; 13: Cold tower; 14: Cold and heat storage device; 15: Heat user; 16: Cold user;

[0035] PZ-1: Shallow ground source water supply pump valve assembly; PZ-2: Shallow ground source return water pump valve assembly; PZ-3: Sewage source water supply pump valve assembly; PZ-4: Sewage source return water pump valve assembly;

[0036] P-1: Reclaimed water intake pump; P-2: Hot water supply pump; P-3: Hot water return pump; P-4: Heat pump unit supply pump; P-5: Heat pump unit return pump; P-6: Energy storage tank supply pump; P-7: Electric chiller unit supply pump; P-8: Electric chiller unit return pump; P-9: Circulating cooling water supply pump; P-10: Circulating cooling water return pump;

[0037] H-1: Shallow geothermal water supply manifold; H-2: Shallow geothermal water return manifold; H-3: Raw water supply manifold; H-4: Reclaimed water return manifold; H-5: Hot water exchange return manifold; H-6: Heat pump power supply return manifold;

[0038] F-1: Shallow geothermal supply water distributor; F-2: Shallow geothermal return water distributor; F-3: Raw water supply water distributor; F-4: Reclaimed water return water distributor; F-5: Hot water exchange water supply water distributor; F-6: Heat pump power supply distributor; F-7: Energy storage tank power supply distributor; F-8: Chilled water outlet distributor;

[0039] a, b, c, d, e, f, g, h, i, j: Electric valves. Detailed Implementation

[0040] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] like Figure 1As shown, the present invention provides a shallow geothermal coupled sewage source heat pump integrated energy system, including: a heat pump energy supply module, a shallow geothermal energy supply module, a sewage energy supply module, an electric refrigeration module, a cold and heat storage device 14, a heat user 15, and a cold user 16. This system couples shallow geothermal, sewage waste heat, and a circulating cooling water system, and utilizes the heat pump, the cold and heat storage device 14, and the electric refrigeration equipment to create an integrated energy system and its operation method.

[0044] The heat pump energy supply module includes a first heat pump heat exchanger 7, a heat pump compressor 8, a second heat pump heat exchanger 9, and a heat pump throttling device 10, which are connected in sequence to form a closed loop. The second heat pump heat exchanger 9 is connected to the cold and heat storage device 14, which can provide it with hot water or cold water and store it. The second heat pump heat exchanger 9 is bidirectionally connected to both the heat user 15 and the cold user 16. The energy supply medium water flows to the heat user 15 to release heat or flows to the cold user 16 to absorb heat, thereby achieving cooling or heating.

[0045] The shallow geothermal energy supply module includes a shallow geothermal well 1, a shallow geothermal water supply pump valve group PZ-1, a geothermal water temperature sensor 2, and a shallow geothermal return water pump valve group PZ-2 connected in sequence. The shallow geothermal water supply pump valve group PZ-1 is connected to the inlet of the first heat pump heat exchanger 7 through the geothermal water temperature sensor 2, and the shallow geothermal return water pump valve group PZ-2 is connected to the outlet of the first heat pump heat exchanger 7. The geothermal water in the shallow geothermal well 1 is passed to the first heat pump heat exchanger 7 for heat exchange under the action of the shallow geothermal water supply pump valve group PZ-1, and the return water flows back to the shallow geothermal well 1 under the action of the shallow geothermal return water pump valve group PZ-2. Both the shallow ground source water supply pump valve assembly PZ-1 and the shallow ground source return water pump valve assembly PZ-2 include several sets of pumps and valves of the same model. The number of pumps that can be started can be flexibly selected according to the amount of hot water exchanged. They can mutually regulate peak flow with waste heat from sewage, allowing the pump efficiency to operate near optimal conditions, resulting in an overall pump efficiency improvement of approximately 5%. The geothermal water temperature sensor 2 enables temperature measurement and control of the geothermal water, facilitating the prioritization of operation for each module within the system.

[0046] The wastewater power supply module includes a wastewater main pipe 3, a wastewater source water supply pump valve group PZ-3, a wastewater treatment equipment 4, a wastewater source side heat exchanger 5, a hot water temperature sensor 6, and a wastewater source return water pump valve group PZ-4 connected in sequence. The hot water temperature sensor 6 is connected to the inlet of the first heat pump heat exchanger 7, and the outlet of the first heat pump heat exchanger 7 is connected to the wastewater source side heat exchanger 5. The raw water enters the wastewater treatment equipment 4 as reclaimed water under the action of the wastewater source water supply pump valve group PZ-3. After entering the wastewater source side heat exchanger 5 for heat exchange, it flows back to the wastewater main pipe 3 under the action of the wastewater source return water pump valve group PZ-4. After the temperature of the hot water is detected by the hot water temperature sensor 6, part of it is sent to the first heat pump heat exchanger 7 for secondary heat exchange, serving as part of the energy source for the heat pump power supply module. The other part can be sent to the electric cooling module. The return water after secondary heat exchange flows back to the wastewater source side heat exchanger 5 to complete the hot water circulation. Both the wastewater supply pump valve assembly PZ-3 and the wastewater return pump valve assembly PZ-4 include several sets of pumps and valves of the same model. The number of pumps that can be started can be flexibly selected according to the amount of hot water exchanged. This allows for peak shaving with the wastewater waste heat, enabling the pumps to operate near their optimal operating conditions, resulting in an overall pump efficiency improvement of approximately 5%. The wastewater temperature sensor 6 enables temperature measurement and control of the hot water exchanged, facilitating the prioritization of each module's operation within the system.

[0047] The electric refrigeration cooling module includes an electric refrigeration unit 11, a cooling water temperature sensor 12, and a cooling tower 13 connected in sequence to form a closed loop. Another part of the hot water is exchanged in the heat exchanger 5 on the sewage source side and then sent to the electric refrigeration unit 11 to exchange heat with its internal circulating cooling water. The electric refrigeration unit 11 is connected to the cold and heat storage module 14 and the cold user 16, and can provide auxiliary cooling through electric refrigeration when the cold and heat storage device 14 is insufficient for peak regulation.

[0048] The thermal and cold storage device 14 is used to store heat during the heating season and cold during the cooling season. It is connected to both the heat user 15 and the cold user 16, and can provide heat to the heat user 15 and cold to the cold user 16.

[0049] In this embodiment, to facilitate the selection of the number of pumps to be started in the shallow geothermal water supply pump valve group PZ-1 and the shallow geothermal return pump valve group PZ-2, a shallow geothermal water supply diverter F-1 is connected between the shallow geothermal water supply pump valve group PZ-1 and the shallow geothermal well 1. The shallow geothermal water supply diverter F-1 can divert the geothermal water from the shallow geothermal well 1. The diverted geothermal water flows to each pump and valve of the shallow geothermal water supply pump valve group PZ-1 for pressurization. The number of pumps to be started can be flexibly selected by opening and closing the valves according to the water exchange volume. The shallow geothermal water supply pump valve group PZ-1 is connected to the geothermal water temperature sensor 2 via a shallow geothermal... The geothermal water, after being diverted and pressurized, flows through the shallow geothermal water supply manifold H-1 and is then fed into the first heat pump heat exchanger 7 after the temperature is detected by the geothermal water temperature sensor 2. The outlet of the first heat pump heat exchanger 7 and the shallow geothermal return water pump valve group PZ-2 are connected by the shallow geothermal return water diverter F-2 to divert the return water. Similarly, the number of pumps to be started by the shallow geothermal return water pump valve group PZ-2 is selected according to the amount of return water after heat exchange. The shallow geothermal return water pump valve group PZ-2 and the shallow geothermal well 1 are connected by the shallow geothermal return water manifold H-2. The shallow geothermal return water pump valve group PZ-2 pressurizes the return water and flows back to the shallow geothermal well 1.

[0050] In this embodiment, to facilitate the selection of the number of starting pumps for the sewage source water supply pump valve group PZ-3 and the sewage source return water pump valve group PZ-4, a raw water supply diverter F-3 is connected between the sewage source water supply pump valve group PZ-3 and the sewage trunk pipe 3 to divert the raw water flowing out of the sewage trunk pipe 3. A raw water supply manifold H-3 is connected between the sewage source water supply pump valve group PZ-3 and the sewage treatment equipment 4. The number of starting pumps for the sewage source water supply pump valve group PZ-3 is selected according to the raw water volume. After diversion and pressurization, the raw water supply is then merged. The water from the H-3 pump is drawn into the sewage treatment equipment 4 for centralized purification. The outlet of the first heat pump heat exchanger 7 is connected back to the sewage source side heat exchanger 5. The sewage source return water pump valve group PZ-4 is connected to the sewage main pipe 3 by a reclaimed water return water manifold H-4. The sewage source return water pump valve group PZ-4 is connected to the outlet of the sewage source side heat exchanger 5 by a reclaimed water return water diverter F-4. After the return water is diverted by the reclaimed water pump valve group PZ-4, it is pressurized by the pump started by the sewage source return water pump valve group PZ-4. Then, under the action of the reclaimed water return water manifold H-4, it flows back to the sewage main pipe 3.

[0051] In this embodiment, a reclaimed water intake pump P-1 is connected between the wastewater treatment equipment 4 and the wastewater source-side heat exchanger 5. The reclaimed water intake pump P-1 is used to pressurize the reclaimed water treated by the wastewater treatment equipment 4, thereby providing power for its transmission. A hot water exchanger temperature sensor 6 and the first heat pump heat exchanger 7 are connected between a hot water exchanger supply pump P-2. The hot water exchanger supply pump P-2 is used to pressurize the hot water exchanged in the wastewater source-side heat exchanger 5 after heat exchange. The hot water exchanger supply pump P-2 is connected to the hot water exchanger supply distributor F-5 and an electric motor. Valve b is connected to the inlet of the first heat pump heat exchanger 7. The hot water supply diverter F-5 diverts the hot water, and a portion of it is fed into the first heat pump heat exchanger 7 for heat exchange through the control of electric valve b. Electric valve b can control the energy supply priority of shallow geothermal and waste heat from sewage. The hot water supply diverter F-5 is connected to the inlet of the electric chiller unit 11 through electric valve a. Electric valve a can make part of the hot water flow to the electric chiller unit 11 to cool its circulating cooling water during the summer cooling season.

[0052] In this embodiment, the outlet of the first heat pump heat exchanger 7 is connected to the sewage source side heat exchanger 5 through the hot water return manifold H-5 and the hot water return pump P-3. The outlet of the electric chiller unit 11 is connected to the hot water return manifold H-5. The return water from the first heat pump heat exchanger 7 and the electric chiller unit 11 can be merged and flow back to the sewage source side heat exchanger 5 under the pressure of the hot water return pump P-3 for heat exchange again, thus completing the hot water circulation.

[0053] In this embodiment, the electric chiller unit 11 is connected to the cooling water temperature sensor 12 by an electric valve j and a circulating cooling water supply pump P-9. The electric valve j controls the circulation of the circulating cooling water, and the circulating cooling water supply pump P-9 pressurizes the circulating cooling water. The cooling water temperature sensor 12 detects the temperature of the circulating cooling water, and once a certain temperature is reached, the water is sent into the cooling tower 13 for heat dissipation. The cooling tower 13 and the electric chiller unit 11 are connected to a circulating cooling water return pump P-10, in which the circulating cooling water, after being cooled, flows back to the electric chiller unit 11.

[0054] The chilled water outlet of the electric chiller unit 11 is connected to the cold storage and heat storage device 14 and the cold user 16 via the electric chiller unit water supply pump P-7 and the chilled water outlet diverter F-8, respectively. Electric valves h and i are connected between the chilled water outlet diverter F-8 and the cold storage and heat storage device 14 and the cold user 16, respectively. The chilled water outlet diverter F-8 is used to divert the chilled water. Electric valves h and i can control the proportion of chilled water flowing to the cold storage and heat storage device 14 and the cold user 16 during the cold storage season. The cold user 16 is connected to the electric chiller unit 11 via the electric chiller unit return water pump P-8. After absorbing heat at the cold user 16, a portion of the chilled water flows back to the electric chiller unit 11 as circulating cooling water to complete the circulation.

[0055] In this embodiment, the medium water outlet of the second heat pump heat exchanger 9 is connected to a heat pump unit water supply pump P-4. The heat pump unit water supply pump P-4 is connected to the cold and heat storage device 14, the heat user 15, and the cold user 16 via the heat pump power supply splitter F-6 and electric valves d, e, and c, respectively. The opening and closing of the split branches and the amount of medium water can be controlled by the above-mentioned electric valves. In winter, the heat medium water after exchanging heat with geothermal water and sewage can release heat at the heat user 15 and at the cold and heat storage device. Heat storage is installed in unit 14. In summer, the geothermal water exchanged can be used to absorb heat at the cold user 16. When the cooling supply is insufficient, the electric chiller unit 11 can cooperate to provide cooling. The heat user 15 and the cold user 16 are connected to the return water port of the second heat pump heat exchanger 9 through the heat pump energy supply return water manifold H-6 and the heat pump unit return water pump P-5. After the medium water releases or absorbs heat, it is pressurized by the heat pump unit return water pump P-5 and flows back to the second heat pump heat exchanger 9 after passing through the heat pump energy supply return water manifold H-6, thus completing the energy supply cycle.

[0056] In this embodiment, the cold and heat storage device 14 is an energy storage water tank, which can also be a concrete tank or an insulated stainless steel tank, etc. The cold and heat storage device 14 can store cold during the cooling season and heat during the heating season, improving equipment utilization. It stores the energy supply medium water during low load and off-peak electricity periods. The outlet of the cold and heat storage device 14 is connected to the energy storage water tank supply pump P-6. The energy storage water tank supply pump P-6 is connected to the heat user 15 and the cold user 16 through the energy storage water tank supply diverter F-7 and electric valves f and g, respectively. The electric valves f and g control the on / off of the corresponding branches. During peak load, the energy supply medium water stored in the cold and heat storage device 14 is pressurized by the energy storage water tank supply pump P-6 and divided into two parts by the energy storage water tank supply diverter F-7. One part is delivered to the cold user 16 for cooling through the electric valve g, and the other part is delivered to the heat user 15 for heating through the electric valve f.

[0057] The operating method of the system of this invention is as follows: Based on the geothermal water temperature T1 measured by the geothermal water temperature sensor, the hot water exchange temperature T2 measured by the wastewater hot water temperature sensor, and the circulating cooling water temperature T3 measured by the cooling water temperature sensor, the system has the following operating modes: heating mode, thermal storage mode, cooling mode, and thermal storage mode.

[0058] Heating operation mode: The electric cooling module is disabled, and there are no users with cooling (electric valves a, c, d, g, h, i, j, and electric chiller water supply pump P-7 are closed). When T1>T2, the shallow geothermal energy supply module is used for heating first. At this time, the sewage energy supply module is closed (sewage source water supply pump valve group PZ-3 is closed). After the shallow geothermal water supply pump valve group PZ-1 is opened to the maximum, the geothermal water in the shallow geothermal well 1 is diverted through the shallow geothermal water supply diverter F-1 to the shallow geothermal water supply pump valve group PZ-1. - This system consists of several sets of identical pumps and valves, allowing for flexible selection of the number of pumps to start based on the amount of hot water exchanged. The geothermal water is pressurized by the shallow geothermal supply pump valve group PZ-1 and then collected through the shallow geothermal water supply manifold H-1. After the geothermal water temperature sensor 2 measures the temperature, the water is sent to the first heat pump heat exchanger 7 to release heat. After heat exchange in the first heat pump heat exchanger 7, the geothermal water is diverted by the shallow geothermal return water distributor F-2 and pressurized through the shallow geothermal return water pump valve group PZ-2. The shallow geothermal return water pump valve group PZ-2 also consists of several sets of identical pumps and valves, allowing for flexible selection of the pumps to start based on the amount of hot water returned. The water is then pressurized by the shallow geothermal return water pump valve group PZ-2 and merged by the shallow geothermal return water manifold H-2 before returning to the shallow geothermal well 1, completing the heat exchange cycle of the shallow geothermal energy supply module. Next, the sewage energy supply module is activated, and the sewage source water supply pump valve group PZ-3 is opened sequentially. The raw water (which can also be reclaimed water) in the sewage main pipe 3 is diverted by the raw water supply diverter F-3 and then pressurized by the sewage source water supply pump valve group PZ-3. The sewage source water supply pump valve group PZ-3 also consists of several sets of pumps and valves of the same model, allowing for flexible selection of the number of pumps to be started based on the required sewage volume. After pressurization, the raw water enters the sewage treatment equipment. 4. Purification treatment: Wastewater treatment equipment 4 can be selected from sedimentation tanks, coarse and fine screens, etc., depending on the wastewater pollutants. After treatment, the reclaimed water is pressurized and flows into the wastewater source side heat exchanger 5 to release heat. After heat exchange, the reclaimed water is diverted by the reclaimed water return diverter F-4 and pressurized by the wastewater source return water pump valve group PZ-4. The wastewater source return water pump valve group PZ-4 consists of several sets of pumps and valves of the same model. The number of pumps to be started can be flexibly selected according to the amount of wastewater returned after heat exchange. After pressurization, the reclaimed water returns through the reclaimed water return water manifold H-4 and flows back to the wastewater main pipe 3, completing one cycle of the wastewater heating system.After the heat exchange water after heat exchange by the sewage source side heat exchanger 5 is measured for temperature by the heat exchange water temperature sensor 6, it is pressurized by the heat exchange water supply pump P-2 and branched by the heat exchange water supply distributor F-5. Among them, the solenoid valve b is opened. After the heat exchange water is measured for temperature by the heat exchange water temperature sensor 6, it is pressurized and conveyed to the first heat pump heat exchanger 7, where it releases heat. The secondary heat exchange water after heat exchange is converged by the heat exchange water return manifold H-5 and pressurized by the heat exchange water return pump P-3, and then pumped back to the sewage source side heat exchanger 5 to complete the heat exchange water cycle. At this time, the solenoid valve a is closed, and the heat exchange water will not flow to the electric refrigeration unit 11 to exchange heat and cool its internal circulating cooling water. The system provides heat for the heat pump energy supply module through the coupling of the shallow geothermal energy supply module and the sewage energy supply module; when T1 < T2, the sewage energy supply module is preferentially used for heating. At this time, the shallow geothermal energy supply module is closed. After the sewage source water supply pump valve group PZ-3 is sequentially opened to the maximum, the shallow geothermal energy supply module is then opened. The shallow geothermal source water supply pump valve group PZ-1 is sequentially opened. The sewage energy supply module and the shallow geothermal energy supply module are coupled as above to jointly provide heat for the heat pump energy supply module by the heat exchange water of geothermal water and sewage; during heating, the heat pump working medium absorbs heat in the first heat pump heat exchanger 7, is compressed by the heat pump compressor 8, and the compressed working medium releases heat to the medium water in the second heat pump heat exchanger 9, is throttled and depressurized by the heat pump throttling device 10, and enters the first heat pump heat exchanger 7 to absorb heat, completing the heat pump working medium cycle for heating. The heat medium water that exchanges heat in the second heat pump heat exchanger 9 is pressurized by the heat pump unit water supply pump P-4 and conveyed to the heat user 15 through the heat pump energy supply distributor F-6 and the opened solenoid valve e to release heat for heating. After the heat medium water releases heat in the heat user 15, it passes through the heat pump energy supply return manifold H-6 and is pressurized by the heat pump unit return pump P-5 and conveyed back to the second heat pump heat exchanger 9 to complete the heating; at this time, the solenoid valves c and d are closed, and the heat pump energy supply module is disconnected from both the cold and heat storage device 14 and the cold user 16, and no heat storage and cooling are performed; during the operation of this mode, the cold and heat storage device 14 is used for peak regulation. The heat medium water stored in it during the low load of the system can flow to the heat user 15 under the pressure of the energy storage water tank water supply pump P-6 through the energy storage water tank energy supply distributor F-7 and the solenoid valve f to assist in heating during the peak load. The heat medium water after heat exchange also passes through the heat pump energy supply return manifold H-6 and is pressurized by the heat pump unit return pump P-5 and conveyed back to the second heat pump heat exchanger 9. ;

[0059] Thermal energy storage operation mode: Thermal energy is stored during the heating season when the system is operating at low load. At this time, the electric refrigeration and cooling module is deactivated, and the cold users (electric valves a, c, f, g, h, i, j, the energy storage water tank supply pump P-6, and the electric refrigeration unit supply pump P-7 are closed). When T1 > T2, the shallow geothermal energy supply module is preferentially used for heating. At this time, the sewage energy supply module is closed (the sewage source supply pump valve group PZ-3 is closed). After sequentially opening the shallow geothermal source supply pump valve group PZ-1 to the maximum, the sewage energy supply module is then opened. The sewage source supply pump valve group PZ-3 is sequentially opened. The shallow geothermal energy supply module and the sewage energy supply module are coupled in the same operation mode to provide heat for the heat pump energy supply module. After the heat pump working medium circulates in the heat pump energy supply module as above, the heat transfer medium water that exchanges heat in the second heat pump heat exchanger 9 is pressurized by the heat pump unit supply pump P-4 and then shunted through the heat pump energy supply diverter F-6. By adjusting the opening degrees of the solenoid valves d and e, the heat transfer medium water is distributed between the cold storage and heat storage device 14 and the heat user 15 for heat storage and heating. After the heat transfer medium water releases heat in the heat user 15, it is collected by the heat pump energy supply return water collector H-6 and then pressurized by the heat pump unit return pump P-5 and transported back to the second heat pump heat exchanger 9 to complete the heating; when T1 < T2, the sewage energy supply module is preferentially used. At this time, the shallow geothermal energy supply module is closed (the shallow geothermal source supply pump valve group PZ-1 is closed). After sequentially opening the sewage source supply pump valve group PZ-3 to the maximum, the shallow geothermal energy supply module is then opened. The shallow geothermal source supply pump valve group PZ-1 is sequentially opened. The shallow geothermal energy supply module and the sewage energy supply module are coupled in the same operation mode to provide heat for the heat pump energy supply module. After the heat pump working medium circulates in the heat pump energy supply module as above, the heat transfer medium water that exchanges heat in the second heat pump heat exchanger is distributed between the cold storage and heat storage device 14 and the heat user 15 for heat storage and heating in the same way as above; after the heat transfer medium water releases heat in the heat user 15, it is collected by the heat pump energy supply return water collector H-6 and then pressurized by the heat pump unit return pump P-5 and transported back to the second heat pump heat exchanger 9 to complete the heating.

[0060] Cooling operation mode: At this time, the electric refrigeration cooling module is closed, and there are no heat users (motorized valves a, e, f, d, h, i, j, and the water supply pump P-7 of the electric refrigeration unit are closed). When T1 < T2, the shallow geothermal energy supply module is preferentially used for cooling. At this time, the sewage energy supply module is closed. After the shallow geothermal water supply pump valve group PZ-1 is sequentially opened to the maximum, the geothermal water in the shallow geothermal well 1 flows through the shallow geothermal water supply diverter F-1 and is diverted to the shallow geothermal water supply pump valve group PZ-1. The shallow geothermal water supply pump valve group PZ-1 consists of several pumps and valves of the same model, and the number of pumps started can be flexibly selected according to the heat exchange water volume. After being pressurized by the shallow geothermal water supply pump valve group PZ-1, the geothermal water converges through the shallow geothermal water supply collector H-1, and after the temperature is measured by the geothermal water temperature sensor 2, it is sent to the first heat pump heat exchanger 7 to absorb heat. After heat exchange in the first heat pump heat exchanger 7, the geothermal water is diverted by the shallow geothermal water return diverter F-2 and pressurized by the shallow geothermal water return pump valve group PZ-2. The shallow geothermal water return pump valve group PZ-2 also consists of several pumps and valves of the same model, and the number of pumps started can be flexibly selected according to the heat exchange water return volume. After being pressurized by the shallow geothermal water return pump valve group PZ-2 and converging through the shallow geothermal water return collector H-2, it returns to the shallow geothermal well 1 to complete the heat exchange cycle of the shallow geothermal energy supply module; then the sewage energy supply module is opened, and the opening of the sewage source water supply pump valve group PZ-3 is sequentially opened. The raw water in the sewage main pipe 3 is pressurized by the sewage source water supply pump valve group PZ-3 and then enters the sewage treatment equipment 4 for purification treatment. The treated reclaimed water is pressurized and flows into the sewage source side heat exchanger 5 to absorb heat. After heat exchange, the reclaimed water is pressurized by the sewage source return water pump valve group PZ-4 and flows back to the sewage main pipe 3. The solenoid valve b is opened, and after the heat exchange water is measured by the heat exchange water temperature sensor 6, it is pressurized by the heat exchange water supply pump P-2 and diverted by the heat exchange water supply diverter F-5. Part of the heat exchange water is transported to the first heat pump heat exchanger 7 through the solenoid valve b, absorbs heat in the first heat pump heat exchanger 7, and after heat exchange, the secondary heat exchange water converges through the heat exchange water return collector H-5 and is pressurized by the heat exchange water return pump P-3 and then pumped back to the sewage source side heat exchanger 5 to complete the heat exchange water cycle. At this time, the solenoid valve a is opened, and part of the heat exchange water can flow to the electric refrigeration unit 11 to cool the internal circulating cooling water. The system cools the heat pump energy supply module through the coupling of the shallow geothermal energy supply module and the sewage energy supply module; when T1 > T2, the sewage energy supply module is preferentially used for cooling. At this time, the shallow geothermal energy supply module is closed (the shallow geothermal water supply pump valve group PZ-1 is closed). After the sewage source water supply pump valve group PZ-3 is sequentially opened to the maximum, the shallow energy supply module is then opened, and the shallow geothermal water supply pump valve group PZ-1 is sequentially opened. The sewage energy supply module and the shallow geothermal energy supply module are coupled as above to cool the heat pump energy supply module;During cooling, the heat pump working fluid releases heat in the first heat pump heat exchanger 7, then is depressurized by the heat pump throttling device 10, and absorbs heat in the second heat pump heat exchanger 9. After absorbing heat, it is compressed by the heat pump compressor 8, and the compressed working fluid returns to the first heat pump heat exchanger 7 to release heat, completing the cooling heat pump working fluid cycle. The chilled water that has undergone heat exchange in the second heat pump heat exchanger 9 is transported to the cooling user 16 to absorb heat for cooling. The chilled water after heat exchange is collected by the heat pump energy supply return water manifold H-6 and then pressurized by the heat pump unit return water pump P-5 and transported back to the second heat pump heat exchanger 9 to complete the cooling. During this mode of operation, the cold and heat storage device 14 is used for peak shaving. The chilled water stored in it can be pressurized by the energy storage water tank supply water pump P-6 and flow through the energy storage water tank supply distributor F-7 and solenoid valve g to the energy storage water tank supply distributor F-7 and solenoid valve g. User 16 provides auxiliary cooling during peak load periods. The chilled water after heat exchange is also collected by the heat pump power supply return water manifold H-6 and then pressurized by the heat pump unit return water pump P-5 before being sent back to the second heat pump heat exchanger 9. When peak load is insufficient, the electric chiller unit 11 is turned on. Comparing T2 and T3, when T2 is closer to the high cooling efficiency zone of the electric chiller unit 11, the solenoid valve a is opened to use secondary sewage hot water for cooling the electric chiller unit 11. The chilled water in the electric chiller unit 11 is pressurized by the electric chiller unit supply water pump P-7 and then sent to user 16 through the chilled water outlet distributor F-8 and electric valve i. After absorbing heat, it is pressurized by the electric chiller unit return water pump P-8 and sent back to the electric chiller unit 11, completing the cooling cycle. At this time, the solenoid valve h is closed, and the chilled water cannot be sent to the cold and heat storage device 14 for storage. When T3 approaches the high-efficiency cooling zone of the electric chiller unit 11, circulating cooling water is used to cool the refrigerant water inside the electric chiller unit 11. At this time, solenoid valve a closes, and the circulating cooling water is pressurized by electric valve j and circulating cooling water supply pump P-9 and then sent to cooling water temperature sensor 12. After temperature measurement, it enters cooling tower 13 for heat dissipation. The cooled circulating cooling water is then sent back to the electric chiller unit 11 by circulating cooling water return pump P-10, completing the electric chiller circulating cooling water cycle.

[0061] Cool storage operation mode: Cool storage is carried out during the cooling season. At this time, the electric refrigeration cooling module is deactivated, and there are no heat users (motorized valves a, e, f, g, h, i, j, the water supply pump P-7 of the electric refrigeration unit, and the water supply pump P-6 of the energy storage water tank are closed). When T1 < T2, the shallow geothermal energy supply module is preferentially used for cooling. At this time, the sewage energy supply module is closed (the sewage source water supply pump valve group PZ-3 is closed). After the shallow geothermal water supply pump valve group PZ-1 is sequentially opened to the maximum, the sewage energy supply module is then opened. The sewage source water supply pump valve group PZ-3 is sequentially opened. The shallow geothermal energy supply module and the sewage energy supply module are coupled as the heat pump energy supply module for cooling as described above. After the heat pump working medium circulates in the heat pump energy supply module as described above, the chilled water for heat exchange in the second heat pump heat exchanger 9 adjusts the cool storage and cooling capacity under the shunting of the heat pump energy supply shunt F-6 and the adjustment of the solenoid valves c and d, and is distributed between the cool storage and heat storage device 14 and the cold user 16 for cool storage and cooling; when T1 > T2, the sewage energy supply module is preferentially used. At this time, the shallow geothermal energy supply module is closed (the shallow geothermal water supply pump valve group PZ-1 is closed). After the sewage source water supply pump valve group PZ-3 is sequentially opened to the maximum, the shallow geothermal energy supply module is then opened. The shallow geothermal water supply pump valve group PZ-1 is sequentially opened. The shallow geothermal energy supply module and the sewage energy supply module are coupled as the heat pump energy supply module for cooling as described above. After the heat pump working medium circulates in the heat pump energy supply module as described above, the chilled water after heat exchange in the second heat pump heat exchanger 9 is distributed between the cool storage and heat storage device 14 and the cold user 16 for cool storage and cooling as described above. The chilled water after heat exchange is converged by the heat pump energy supply return water collector H-6 and then pressurized by the heat pump unit return water pump P-5 and transported back to the second heat pump heat exchanger 9 to complete cooling; when the chilled water is insufficient, the electric refrigeration unit 11 is started. Compare T2 and T3. When T2 is closer to the high-efficiency cooling area of the electric refrigeration unit 11, the solenoid valve a is opened as described above, and the secondary sewage heat exchange water is used to cool the chilled water in the electric refrigeration unit 11. The solenoid valve h can be opened to make part of the circulating cooling water pressurized by the water supply pump P-7 of the electric refrigeration unit and sent to the cool storage and heat storage device 14 for cool storage through the chilled water outlet shunt F-8; when T3 is closer to the high-efficiency cooling area of the electric refrigeration unit 11, the circulating cooling water is used to cool the chilled water in the electric refrigeration unit 11. The circulating cooling water is pressurized by the motorized valve j and the circulating cooling water supply pump P-9 and then transported to the cooling water temperature sensor 12 for temperature measurement and then enters the cooling tower 13 for heat dissipation. The circulating cooling water after heat dissipation is transported back to the electric refrigeration unit 11 by the circulating cooling water return pump P-10 to complete the electric refrigeration circulating cooling water cycle.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A shallow ground-source coupled sewage-source heat pump integrated energy system, characterized in that, include: Heat pump energy supply modules, shallow geothermal energy supply modules, sewage energy supply modules, electric refrigeration modules, cold and heat storage devices, heat users and cold users; The heat pump power supply module includes a first heat pump heat exchanger, a heat pump compressor, a second heat pump heat exchanger and a heat pump throttling device that are connected in sequence to form a closed loop. The second heat pump heat exchanger is connected to the cold and heat storage device, and the second heat pump heat exchanger is bidirectionally connected to both the heat user and the cold user. The shallow geothermal energy supply module includes a shallow geothermal well, a shallow ground source water supply pump valve group, a geothermal water temperature sensor, and a shallow ground source return water pump valve group connected in sequence. The shallow ground source water supply pump valve group is connected to the inlet of the first heat pump heat exchanger through the geothermal water temperature sensor. The shallow ground source return water pump valve group is connected to the outlet of the first heat pump heat exchanger. The geothermal water in the shallow geothermal well is circulated to the first heat pump heat exchanger for heat exchange under the action of the shallow ground source water supply pump valve group. The return water flows back to the shallow geothermal well under the action of the shallow ground source return water pump valve group. The wastewater power supply module includes a wastewater trunk pipe, a wastewater source water supply pump valve group, a wastewater treatment equipment, a wastewater source side heat exchanger, a hot water exchange temperature sensor, and a wastewater source return water pump valve group connected in sequence. The hot water exchange temperature sensor is connected to the inlet of the first heat pump heat exchanger, and the outlet of the first heat pump heat exchanger is connected to the wastewater source side heat exchanger. Raw water enters the wastewater treatment equipment as treated reclaimed water under the action of the wastewater source water supply pump valve group. After entering the wastewater source side heat exchanger and exchanging heat with the hot water, it flows back to the wastewater trunk pipe under the action of the wastewater source return water pump valve group. Part of the hot water is sent to the first heat pump heat exchanger for secondary heat exchange, and the other part is sent to the electric cooling module. The return water after secondary heat exchange flows back to the wastewater source side heat exchanger for heat exchange to complete the hot water circulation. The electric refrigeration and cooling module includes an electric refrigeration unit, a cooling water temperature sensor, and a cooling tower that are connected in sequence to form a closed loop. Another part of the hot water is exchanged in the heat exchanger on the sewage source side and then supplied to the electric refrigeration unit. The electric refrigeration unit is connected to the cold and heat storage device and the cold user. The aforementioned cold and heat storage device is used for energy storage and is connected to both heat users and cold users, providing heat to heat users and cooling to cold users.

2. The shallow ground-source coupled sewage source heat pump integrated energy system according to claim 1, characterized in that, The shallow geothermal water supply pump valve assembly is connected to the shallow geothermal well via a shallow geothermal water supply diverter, and the shallow geothermal water supply pump valve assembly is connected to the geothermal water temperature sensor via a shallow geothermal water supply manifold; the outlet of the first heat pump heat exchanger is connected to the shallow geothermal return water pump valve assembly via a shallow geothermal return water diverter, and the shallow geothermal return water pump valve assembly is connected to the shallow geothermal well via a shallow geothermal return water manifold.

3. The shallow ground-source coupled sewage-source heat pump integrated energy system according to claim 1, characterized in that, The sewage source water supply pump valve group is connected to the sewage trunk line via a raw water supply diverter, and the sewage source water supply pump valve group is connected to the sewage treatment equipment via a raw water supply manifold. The outlet of the first heat pump heat exchanger is connected to the sewage source return water pump valve group through the sewage source side heat exchanger. The sewage source return water pump valve group is connected to the sewage trunk line via a reclaimed water return water manifold. The sewage source return water pump valve group is connected to the outlet of the sewage source side heat exchanger via a reclaimed water return water diverter.

4. The shallow ground-source coupled sewage source heat pump integrated energy system according to claim 1, characterized in that, The wastewater treatment equipment is connected to the wastewater source heat exchanger via a reclaimed water intake pump. The hot water temperature sensor is connected to the first heat pump heat exchanger via a hot water supply pump. The hot water supply pump is connected to the inlet of the first heat pump heat exchanger via a hot water supply distributor and an electric valve. The hot water supply distributor is connected to the inlet of the electric refrigeration unit via an electric valve.

5. The shallow ground-source coupled sewage source heat pump integrated energy system according to claim 4, characterized in that, The outlet of the first heat pump heat exchanger is connected to the wastewater source heat exchanger via a hot water return manifold and a hot water return pump, and the outlet of the electric refrigeration unit is connected to the hot water return manifold.

6. The shallow ground-source coupled sewage-source heat pump integrated energy system according to claim 1, characterized in that, The electric refrigeration unit is connected to the cooling water temperature sensor by an electric valve and a circulating cooling water supply pump, and the cooling tower is connected to the electric refrigeration unit by a circulating cooling water return pump.

7. The shallow ground-source coupled sewage source heat pump integrated energy system according to claim 1, characterized in that, The refrigerant water outlet of the electric chiller unit is connected to the cold and heat storage device and the cold user respectively through the electric chiller unit water supply pump and the refrigerant water outlet distributor. The refrigerant water outlet distributor is connected to the cold and heat storage device and the cold user respectively through an electric valve. The cold user is connected to the electric chiller unit through the electric chiller unit return water pump.

8. The shallow ground-source coupled sewage-source heat pump integrated energy system according to claim 1, characterized in that, The heat medium water outlet of the second heat pump heat exchanger is connected to the heat pump unit water supply pump. The heat pump unit water supply pump is connected to the cold and heat storage device, the heat user and the cold user respectively through the heat pump energy supply distributor and three electric valves. The heat user and the cold user are connected to the return water port of the second heat pump heat exchanger through the heat pump energy supply return water manifold and the heat pump unit return water pump.

9. The shallow ground-source coupled sewage-source heat pump integrated energy system according to claim 1, characterized in that, The cold and heat storage device is an energy storage water tank. The outlet of the cold and heat storage device is connected to an energy storage water tank water supply pump. The energy storage water tank water supply pump is connected to the heat user and the cold user respectively through an energy storage water tank power supply distributor and two electric valves.

10. A method of operating the system according to any one of claims 1-9, characterized in that, Based on the geothermal water temperature T1 measured by the geothermal water temperature sensor, the hot water exchange temperature T2 measured by the wastewater hot water temperature sensor, and the circulating cooling water temperature T3 measured by the cooling water temperature sensor, the system has the following operating modes: heating mode, thermal storage mode, cooling mode, and thermal storage mode. Heating operation mode: The electric refrigeration and cooling module is deactivated, and there are no cooling users. When T1 > T2, the shallow geothermal energy supply module is preferentially used for heating. At this time, the sewage energy supply module is closed. After sequentially opening the shallow geothermal water supply pump valve group to the maximum, the geothermal water in the shallow geothermal well is pressurized by the shallow geothermal water supply pump valve group and sent to the first heat pump heat exchanger to release heat after being measured by the geothermal water temperature sensor. The geothermal water after heat exchange is pressurized by the shallow geothermal return water pump valve group and then returned to the shallow geothermal well to complete the geothermal water heat exchange cycle. Then, the sewage energy supply module is opened, and the sewage source water supply pump valve group is sequentially opened. The raw water in the sewage main pipe is pressurized by the sewage source water supply pump valve group and then enters the sewage treatment equipment for purification. The treated reclaimed water is pressurized and flows into the sewage source side heat exchanger to release heat. The reclaimed water after heat exchange is pressurized by the sewage source return water pump valve group and flows back to the sewage main pipe. The heat exchange water is measured by the heat exchange water temperature sensor and then pressurized and transported to the first heat pump heat exchanger to release heat in the first heat pump heat exchanger. The secondary heat exchange water after heat exchange is pressurized and then flows back to the sewage source side heat exchanger to complete the heat exchange water cycle. The shallow geothermal energy supply module and the sewage energy supply module are coupled to provide heat for the heat pump energy supply module. When T1 < T2, the sewage energy supply module is preferentially used for heating. At this time, the shallow geothermal energy supply module is closed. After sequentially opening the sewage source water supply pump valve group to the maximum, the shallow geothermal energy supply module is then opened, and the shallow geothermal water supply pump valve group is sequentially opened. The sewage energy supply module and the shallow geothermal energy supply module are coupled as above to provide heat for the heat pump energy supply module. During heating, the heat pump working medium absorbs heat in the first heat pump heat exchanger, is compressed by the heat pump compressor, and the compressed working medium releases heat to the medium water in the second heat pump heat exchanger, is throttled and depressurized by the heat pump throttling device, and enters the first heat pump heat exchanger to absorb heat to complete the heat pump working medium cycle for heating. The heat medium water that undergoes heat exchange in the second heat pump heat exchanger is transported to the heat user to release heat for heating. During the operation of this mode, the cold storage and heat storage device is used for peak regulation; Thermal energy storage operation mode: Thermal energy is stored during the heating season. At this time, the electric refrigeration and cooling module is deactivated, and there are no cooling users. When T1 > T2, the shallow geothermal energy supply module is preferentially used for heating. At this time, the sewage energy supply module is closed. After the shallow geothermal water supply pump valve group is sequentially opened to the maximum, the sewage energy supply module is then opened. The sewage source water supply pump valve group is sequentially opened. The shallow geothermal energy supply module and the sewage energy supply module are coupled as above to provide heat for the heat pump energy supply module. After the heat pump working medium circulates in the heat pump energy supply module as above, the heat transfer medium water that exchanges heat in the second heat pump heat exchanger is distributed between the cold storage and heat storage device and the heat user for heat storage and heating. When T1 < T2, the sewage energy supply module is preferentially used. At this time, the shallow geothermal energy supply module is closed. After the sewage source water supply pump valve group is sequentially opened to the maximum, the shallow geothermal energy supply module is then opened. The shallow geothermal water supply pump valve group is sequentially opened. The shallow geothermal energy supply module and the sewage energy supply module are coupled as above to provide heat for the heat pump energy supply module. After the heat pump working medium circulates in the heat pump energy supply module as above, the heat transfer medium water that exchanges heat in the second heat pump heat exchanger is distributed between the cold storage and heat storage device and the heat user for heat storage and heating. Cooling operation mode: At this time, the electric refrigeration cooling module is turned off and there are no heat users. When T1 < T2, the shallow geothermal energy supply module is preferentially used for cooling. At this time, the sewage energy supply module is turned off. After the shallow geothermal water supply pump valve group is successively opened to the maximum, the geothermal water in the shallow geothermal well is pressurized by the shallow geothermal water supply pump valve group and sent to the first heat pump heat exchanger to absorb heat after the temperature is measured by the geothermal water temperature sensor. The geothermal water after heat exchange is pressurized by the shallow geothermal return water pump valve group and then returned to the shallow geothermal well to complete the geothermal water heat exchange cycle. Then, the sewage energy supply module is turned on. The sewage source water supply pump valve group is successively opened. The raw water in the sewage main pipe is pressurized by the sewage source water supply pump valve group and then enters the sewage treatment equipment for purification. The treated reclaimed water is pressurized and flows into the sewage source side heat exchanger to absorb heat. The reclaimed water after heat exchange is pressurized by the sewage source return water pump valve group and flows back to the sewage main pipe. The heat exchange water is measured by the heat exchange water temperature sensor and then pressurized and transported to the first heat pump heat exchanger, where it absorbs heat. The secondary heat exchange water after heat exchange is pressurized and flows back to the sewage source side heat exchanger for heat exchange to complete the heat exchange water cycle. The shallow geothermal energy supply module and the sewage energy supply module are coupled to supply cooling for the heat pump energy supply module; when T1 > T2, the sewage energy supply module is preferentially used for cooling. At this time, the shallow geothermal energy supply module is turned off. After the sewage source water supply pump valve group is successively opened to the maximum, the shallow energy supply module is then turned on. The shallow geothermal water supply pump valve group is successively opened. The sewage energy supply module and the shallow geothermal energy supply module are coupled in the same way as above to supply cooling for the heat pump energy supply module; during cooling, the heat pump working medium releases heat in the first heat pump heat exchanger, is throttled and depressurized by the heat pump throttling device, absorbs heat in the second heat pump heat exchanger, is compressed by the heat pump compressor after absorption of heat, and the compressed working medium enters the first heat pump heat exchanger to release heat to complete the heat pump working medium cycle for cooling; the medium water for heat exchange in the second heat pump heat exchanger is transported to the cold user to absorb heat for cooling; during the operation of this mode, the cold storage and heat storage device is used for peak regulation. When the peak regulation is insufficient, the electric refrigeration unit is turned on. The refrigerant water in the electric refrigeration unit is transported to the cold user for cooling, and after absorbing heat, it is transported back to the electric refrigeration unit to complete the refrigerant water refrigeration cycle; compare T2 and T3. When T2 is closer to the high-efficiency cooling area of the electric refrigeration unit, the secondary sewage heat exchange water is used to cool the electric refrigeration unit; when T3 is closer to the high-efficiency cooling area of the electric refrigeration unit, the circulating cooling water is used to cool the electric refrigeration unit. The circulating cooling water is pressurized and transported to the cooling water temperature sensor for temperature measurement and then enters the cooling tower for heat dissipation. The circulating cooling water after heat dissipation is transported back to the electric refrigeration unit to complete the circulating cooling water cycle; Cool storage operation mode: During the cooling season, cool storage is carried out. At this time, the electric refrigeration cooling module is deactivated and there are no heat users. When T1 < T2, the shallow geothermal energy supply module is preferentially used for cooling. At this time, the sewage energy supply module is closed. After the shallow geothermal water supply pump valve group is sequentially opened to the maximum, the sewage energy supply module is then opened. The sewage source water supply pump valve group is sequentially opened. The shallow geothermal energy supply module and the sewage energy supply module are coupled as the heat pump energy supply module for cooling as described above. After the heat pump working medium circulates in the heat pump energy supply module as described above, the chilled water for heat exchange in the second heat pump heat exchanger is distributed between the cool storage and heat storage device and the cold users for cool storage and cooling; when T1 > T2, the sewage energy supply module is preferentially used. At this time, the shallow geothermal energy supply module is closed. After the sewage source water supply pump valve group is sequentially opened to the maximum, the shallow geothermal energy supply module is then opened. The shallow geothermal water supply pump valve group is sequentially opened. The shallow geothermal energy supply module and the sewage energy supply module are coupled as the heat pump energy supply module for cooling as described above. After the heat pump working medium circulates in the heat pump energy supply module as described above, the chilled water after heat exchange in the second heat pump heat exchanger is distributed between the cool storage and heat storage device and the cold users for cool storage and cooling; when the chilled water is insufficient, the electric refrigeration unit is started. The chilled water in the electric refrigeration unit is pressurized and split into two parts. One part is transported to the cold users for cooling, and after absorbing heat, it is transported back to the electric refrigeration unit to complete the chilled water refrigeration cycle. The other part is transported to the cool storage and heat storage device for storage; compare T2 and T3. When T2 is closer to the high-efficiency cooling area of the electric refrigeration unit, the secondary sewage heat exchange water is used for cooling the electric refrigeration unit as described above; when T3 is closer to the high-efficiency cooling area of the electric refrigeration unit, the circulating cooling water is used for cooling the electric refrigeration unit. The circulating cooling water is pressurized and transported to the cooling water temperature sensor, and after temperature measurement, it enters the cooling tower for heat dissipation. The heat-dissipated circulating cooling water is transported back to the electric refrigeration unit to complete the circulating cooling water cycle.

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