A geothermal coupling sewage source heat pump comprehensive energy supply system and operation method

Abstract

The present application relates to the technical field of energy supply system, especially to a geothermal coupling sewage source heat pump comprehensive energy supply system and operation method. The system comprises a ground source heat pump system, a shallow geothermal system, a middle-deep geothermal system, a cross-season heat storage system, a sewage source heat pump system and a sewage heat supply system; the system couples shallow geothermal energy, middle-deep dry hot rock geothermal energy and sewage waste heat, and uses the ground source heat pump, the sewage source heat pump, the cross-season heat storage and the cold storage device to build a comprehensive energy system, so as to realize cooling in summer, heating in winter and provide various energy supply operation modes. Due to the coupling of shallow geothermal energy and middle-deep dry hot rock geothermal energy, the ground source heat pump can improve the equipment efficiency by about 5%-10%, and the shallow geothermal energy can realize cold-heat balance by 100%; due to the addition of the cross-season heat storage system, the utilization rate of the middle-deep dry hot rock well equipment can be improved by more than 50%; and the addition of the cold storage device can improve the economy of the comprehensive energy project by 5%-10%.

Description

Technical Field

[0001] The present invention relates to the technical field of energy supply systems, and in particular to a geothermal coupled sewage source heat pump integrated energy supply system and an operation method thereof. Background Art

[0002] A clean, low-carbon, efficient, and intelligent integrated energy system is a strong support for the new power system. In the heating sector, the development and utilization of renewable energy is a key approach to reducing heating energy consumption and carbon emissions. Within heating technology, utilizing medium- and shallow-layer geothermal energy and wastewater waste heat for heating is an important research direction. Shallow geothermal energy is a low-temperature thermal energy resource stored within a few hundred meters of the Earth's surface. It primarily derives from solar radiation and the geothermal warming effect within the Earth's interior. It is clean, renewable, efficient, and widely distributed. Medium- and deep-layer geothermal energy refers to geothermal resources located within 1,000 meters below the Earth's surface, with temperatures typically ranging from 70°C to 200°C. my country, with its vast territory, has varying levels of available medium- and deep-layer geothermal resources in different regions. Currently, hot dry rock geothermal energy, which extracts heat without water, holds greater development potential due to its more environmentally friendly nature. Ground-source heat pump technology utilizes geothermal resources for heating and cooling, offering high efficiency and energy savings, effectively reducing reliance on traditional energy sources. The discharge volume of urban domestic sewage and industrial wastewater is huge, and sewage contains a large amount of thermal energy. The sewage source heat pump system extracts heat from sewage to provide heating and cooling services for buildings, realizing the resource utilization of sewage. However, different energy forms have their own characteristics and advantages. How to adapt to local conditions, give full play to the role of shallow geothermal energy, medium-deep hot dry rocks, and waste heat from sewage, couple multiple energy sources to achieve complementary energy utilization, and improve the efficiency and reliability of the energy system while providing cooling and heating for users is the problem to be solved by this patent. Summary of the Invention

[0003] One of the purposes of the present invention is to provide a geothermal coupled sewage source heat pump integrated energy supply system, which can solve the problems existing in the prior art;

[0004] Another object of the present invention is to provide a geothermal coupled sewage source heat pump integrated energy supply operation method, which is used to control the operation of a geothermal coupled sewage source heat pump integrated energy supply system.

[0005] The present invention provides a geothermal coupled sewage source heat pump integrated energy supply system, which includes a geothermal heat pump system, a shallow geothermal system, a medium-deep geothermal system, an inter-seasonal heat storage system, a sewage source heat pump system and a sewage heating system;

[0006] The mid-deep geothermal system is connected to the geothermal water heat exchanger via a first circulation pipeline, and is connected to the inter-seasonal heat storage system via a second circulation pipeline;

[0007] The shallow geothermal system is connected to a geothermal water heat exchanger, and the water supply of the shallow geothermal system is heat-exchanged with the water supply of the medium-deep geothermal system in the geothermal water heat exchanger before being heat-exchanged with the ground source heat pump system;

[0008] The inter-seasonal heat storage system is connected to the ground source heat pump system through a third circulation pipeline to perform heat exchange;

[0009] The sewage source heat pump system is connected to the sewage heating system;

[0010] The ground source heat pump system and sewage source heat pump system utilize shallow geothermal energy, medium and deep hot dry rock geothermal energy and waste heat from sewage for heat exchange and provide heating, cooling, heat storage and cold storage.

[0011] Preferably, the shallow geothermal system includes a shallow geothermal heat pump well, a shallow geothermal water supply pump and a shallow geothermal return water pump;

[0012] The shallow geothermal heat pump well, the shallow geothermal water supply pump and the geothermal water heat exchanger are connected in sequence, and the shallow geothermal heat pump well is also connected to the shallow geothermal return water pump;

[0013] The geothermal water heat exchanger is connected to the shallow, medium and deep geothermal concentrator, the shallow, medium and deep geothermal concentrator is also connected to the geothermal heat pump evaporator of the geothermal heat pump system, the geothermal heat pump evaporator is connected to the shallow, medium and deep geothermal diverter, and the shallow, medium and deep geothermal diverter is connected to the shallow geothermal return water pump.

[0014] Preferably, the medium-deep geothermal system includes a medium-deep return flow combiner, a medium-deep hot dry rock well, a medium-deep hot dry rock return water pump, a medium-deep hot dry rock water supply pump, an electric valve a and an electric valve b;

[0015] The geothermal water heat exchanger is also connected to the mid-deep layer return flow combiner and the electric valve a, and the mid-deep layer return flow combiner is also connected to the mid-deep layer dry hot rock return water pump;

[0016] The medium-deep hot dry rock return water pump is simultaneously connected to the medium-deep hot dry rock well, the medium-deep hot dry rock water supply pump and the medium-deep geothermal diverter in sequence, and the medium-deep geothermal diverter is connected to the electric valve a and the electric valve b respectively.

[0017] Preferably, the inter-seasonal heat storage system includes an inter-seasonal heat storage water pump, an inter-seasonal heat storage buried pipe, an electric valve c, an electric valve d, an inter-seasonal heat storage return water pump, an inter-seasonal heat storage hot water pump and an inter-seasonal heat storage heating return water pump;

[0018] The mid-deep return flow combiner is also connected to the inter-seasonal heat storage return water pump;

[0019] The shallow, medium and deep geothermal confluence devices are also connected to the inter-seasonal heat storage and hot water pumps;

[0020] The electric valve b is connected to the inter-seasonal heat storage water pump and the inter-seasonal heat storage buried pipe in sequence. The inter-seasonal heat storage buried pipe is also connected to the electric valve c, the electric valve d and the inter-seasonal heat storage heating return water pump respectively;

[0021] The electric valve c is also connected to the inter-seasonal heat storage return water pump, the electric valve d is also connected to the inter-seasonal heat storage hot water pump, and the inter-seasonal heat storage heating return water pump is also connected to the shallow, medium and deep geothermal diverter.

[0022] Preferably, the geothermal heat pump system further comprises a geothermal heat pump compressor, a geothermal heat pump condenser and a geothermal heat pump throttling device;

[0023] The ground source heat pump evaporator is also connected to the ground source heat pump compressor and the ground source heat pump throttling device, the ground source heat pump compressor is connected to the ground source heat pump condenser, and the ground source heat pump condenser is connected to the ground source heat pump throttling device.

[0024] Preferably, the geothermal heat pump condenser is also connected to a geothermal heat pump water supply pump and a geothermal heat pump return water pump, the geothermal heat pump water supply pump is connected to a geothermal heat pump outlet manifold, and the geothermal heat pump return water pump is connected to a geothermal heat pump return water manifold;

[0025] The water outlet diverter of the ground source heat pump is connected to the electric valve h, electric valve i and electric valve j respectively. The electric valve h is connected to the heat user, the electric valve i is connected to the cold and heat storage device, and the electric valve j is connected to the cold user.

[0026] The heat users are also connected to the ground source heat pump return water manifold, electric valve p, electric valve k and sewage source heat pump return water manifold respectively;

[0027] The cold and heat storage device is also connected to the energy storage water supply pump, electric valve l and electric valve n respectively;

[0028] The cold users are also connected to the ground source heat pump return water merger, the sewage source heat pump return water merger, the electric valve q, the electric valve m and the electric refrigeration unit return water pump respectively. The energy storage water supply pump is connected to the cold and heat storage diverter, and the cold and heat storage diverter is connected to the electric valve p and the electric valve q respectively.

[0029] Preferably, the sewage source heat pump system includes a sewage source heat pump return pump, a sewage source heat pump condenser, a sewage source heat pump compressor, a sewage source heat pump throttling device and a sewage source heat pump evaporator;

[0030] The sewage source heat pump return water manifold is also connected to the sewage source heat pump return water pump and the sewage source heat pump condenser in sequence;

[0031] The sewage source heat pump condenser is also connected to a sewage source heat pump water supply pump, a sewage source heat pump compressor and a sewage source heat pump throttling device;

[0032] The sewage source heat pump water supply pump is also connected to the electric valve k, electric valve l and electric valve m respectively;

[0033] The sewage source heat pump compressor is also connected to the sewage source heat pump evaporator.

[0034] Preferably, the sewage source heat pump evaporator is also connected to the sewage source heat pump throttling device, electric valve e and electric valve f, the electric valve e is connected to the sewage source secondary side water supply pump and the sewage source side heat exchanger in sequence, and the electric valve f is connected to the sewage source secondary side return water pump.

[0035] Preferably, the sewage heating system includes a sewage trunk pipe and sewage treatment facilities;

[0036] The sewage source side heat exchanger is also connected to the sewage source secondary side return water pump, the second sewage source primary side water intake pump and the sewage source return water pump respectively;

[0037] The primary side water intake pump of the second sewage source is connected to the sewage treatment facility, and the primary side water intake pump of the first sewage source is connected to the sewage trunk pipe in sequence. The sewage trunk pipe is also connected to the sewage source return water pump.

[0038] Preferably, the electric refrigeration unit return pump is connected to the electric refrigeration unit;

[0039] The electric refrigeration unit is also connected to the electric refrigeration unit water supply pump, the electric valve g and the circulating cooling water supply pump, and the electric valve g is connected to the circulating cooling water return pump, the cooling tower, and the circulating cooling water supply pump in sequence;

[0040] The water supply pump of the electric refrigeration unit is connected to the refrigerant water outlet diverter of the electric refrigeration unit, and the refrigerant water outlet diverter of the electric refrigeration unit is respectively connected to the electric valve n and the electric valve o.

[0041] In this embodiment, a method for operating a geothermal-coupled sewage-source heat pump integrated energy supply system is also provided. The method controls the operation of the geothermal-coupled sewage-source heat pump integrated energy supply system as described above. The geothermal-coupled sewage-source heat pump integrated energy supply system includes multiple operating modes. By controlling the operating states of different valves and water pumps, the geothermal-coupled sewage-source heat pump integrated energy supply system can be switched between different operating modes.

[0042] The various working modes are:

[0043] Conventional heating mode in winter:

[0044] In this working mode, close the electric valve b, electric valve c, electric valve i, electric valve l, electric valve p, electric valve q, electric valve j, electric valve m, electric valve n, electric valve o and electric valve g;

[0045] Shut down the inter-seasonal thermal storage water pump, inter-seasonal thermal storage return pump, electric refrigeration unit water supply pump, electric refrigeration unit return pump, circulating cooling water supply pump, circulating cooling water return pump, and energy storage water supply pump, while other equipment operates normally to supply heat to heat users;

[0046] Winter heating and heat storage mode:

[0047] In this working mode, close the electric valve b, electric valve c, electric valve p, electric valve q, electric valve j, electric valve m, electric valve n, electric valve o and electric valve g;

[0048] Shut down the inter-seasonal thermal storage water pump, inter-seasonal thermal storage return pump, electric refrigeration unit water supply pump, electric refrigeration unit return pump, circulating cooling water supply pump, circulating cooling water return pump, and energy storage water supply pump. Other equipment will operate normally to supply heat to heat users and store heat for the cold and heat storage device.

[0049] Winter peak-shaving heating mode:

[0050] In this working mode, close the electric valve b, electric valve c, electric valve i, electric valve l, electric valve q, electric valve j, electric valve m, electric valve n, electric valve o and electric valve g;

[0051] Shut down the inter-seasonal thermal storage water pump, inter-seasonal thermal storage return pump, electric refrigeration unit water supply pump, electric refrigeration unit return pump, circulating cooling water supply pump, and circulating cooling water return pump. Other equipment will operate normally to supply heat to heat users, and at the same time, the heat stored in the cold and heat storage device will be used for peak heating regulation.

[0052] Summer cooling mode:

[0053] In this working mode, electric valves a, d, i, l, p, q, h, k and n are closed; the inter-seasonal heat storage hot water pump, the inter-seasonal heat storage return water pump and the energy storage water supply pump are closed, while other equipment operates normally to supply cooling to cold users;

[0054] Summer cooling mode:

[0055] In this working mode, electric valves a, d, p, q, h and k are closed; the inter-seasonal heat storage hot water pump, the inter-seasonal heat storage return water pump and the energy storage water supply pump are closed, and other equipment operates normally to supply cold to cold users and store cold for the cold and heat storage device.

[0056] Summer peak load mode:

[0057] In this working mode, electric valves a, d, p, h and k are closed; the inter-seasonal heat storage hot water pump and the inter-seasonal heat storage heating return water pump are closed, and other equipment operates normally to provide cooling for cold users, while the cooling capacity stored in the cold and heat storage device is used for cooling peak regulation;

[0058] Transition season heat storage mode:

[0059] In this working mode, only electric valve b and electric valve c are opened, and the medium-deep hot dry rock water supply pump, medium-deep hot dry rock return pump, inter-seasonal heat storage water pump, and inter-seasonal heat storage return pump are started. Other equipment and valves are closed, and the medium-deep hot dry rock heating system is used to store heat for the inter-seasonal heat storage buried pipe for winter heating.

[0060] Beneficial effects:

[0061] (1) This system couples shallow geothermal energy, medium-deep hot dry rock geothermal energy, and waste heat from sewage, and uses ground-source heat pumps, sewage-source heat pumps, cross-seasonal heat storage, and cold and heat storage devices to create a comprehensive energy system, providing users with cooling in summer and heating in winter, and offering a variety of energy supply operation modes.

[0062] (2) Due to the coupling of shallow geothermal energy and medium-deep dry hot rock geothermal energy, the ground-source heat pump of the present invention can improve the equipment efficiency by about 5%-10%, and the shallow geothermal energy can achieve 100% cold and hot balance;

[0063] (3) Due to the addition of the cross-seasonal heat storage system, the utilization rate of medium-deep dry hot rock well equipment can be increased by more than 50%;

[0064] (4) Due to the addition of cold and heat storage devices, this system can improve the economic efficiency of the comprehensive energy project by 5%-10%. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0066] Figure 1 A schematic structural diagram of a geothermal coupled sewage source heat pump integrated energy supply system provided in a specific embodiment of the present invention.

[0067] Description of reference numerals:

[0068] 1. Shallow geothermal heat pump well; 2. Geothermal water heat exchanger; 3. Medium-deep hot dry rock well; 4. Inter-seasonal buried heat storage pipe; 5. Sewage main pipe; 6. Sewage treatment facility; 7. Sewage source side heat exchanger; 8. Geothermal heat pump evaporator; 9. Geothermal heat pump compressor; 10. Geothermal heat pump condenser; 11. Geothermal heat pump throttling device; 12. Sewage source heat pump evaporator; 13. Sewage source heat pump compressor; 14. Sewage source heat pump condenser; 15. Sewage source heat pump throttling device; 16. Electric refrigeration unit; 17. Cooling tower; 18. Cold and heat storage device; 19. Heat users; 20. Cooling users

[0069] P-1, shallow ground source water supply pump; P-2, shallow ground source return water pump; P-3, medium-deep hot dry rock water supply pump; P-4, medium-deep hot dry rock return water pump; P-5, inter-seasonal thermal storage water pump; P-6, inter-seasonal thermal storage return water pump; P-7, inter-seasonal thermal storage water supply pump; P-8, inter-seasonal thermal storage return water pump; P-9, first sewage source primary side water intake pump; P-10, second sewage source primary side water intake pump; P-11, sewage source return water pump Pumps; P-12, sewage source secondary side water supply pump; P-13, sewage source secondary side return pump; P-14, ground source heat pump water supply pump; P-15, ground source heat pump return pump; P-16, sewage source heat pump water supply pump; P-17, sewage source heat pump return pump; P-18, electric refrigeration unit water supply pump; P-19, electric refrigeration unit return pump; P-20, circulating cooling water supply pump; P-21, circulating cooling water return pump; P-22, energy storage water supply pump;

[0070] H-1, shallow, medium and deep geothermal confluence; H-2, medium and deep return flow confluence; H-3, ground source heat pump return water confluence; H-4, sewage source heat pump return water confluence;

[0071] F-1, shallow, medium and deep geothermal flow divider; F-2, medium and deep geothermal flow divider; F-3, refrigerant water outlet flow divider for electric refrigeration unit; F-4, ground source heat pump outlet water divider; F-5, sewage source heat pump outlet water divider;

[0072] F-6, cold and heat storage diverter. DETAILED DESCRIPTION

[0073] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0074] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0075] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0076] like Figure 1 As shown, this embodiment provides a geothermal coupled sewage source heat pump integrated energy supply system, which includes a geothermal heat pump system, a shallow geothermal system, a medium and deep geothermal system, an inter-seasonal heat storage system, a sewage source heat pump system and a sewage heating system.

[0077] The medium-deep geothermal system is connected to the geothermal water heat exchanger through the first circulation pipeline and is connected to the inter-seasonal heat storage system through the second circulation pipeline.

[0078] The shallow geothermal system is connected to the geothermal water heat exchanger. The water supply of the shallow geothermal system is exchanged with the water supply of the medium and deep geothermal system in the geothermal water heat exchanger and then exchanged with the ground source heat pump system.

[0079] The inter-seasonal heat storage system is connected to the ground source heat pump system through the third circulation pipeline for heat exchange.

[0080] The sewage source heat pump system is connected to the sewage heating system.

[0081] Geothermal heat pump systems and sewage source heat pump systems utilize shallow geothermal energy, medium-deep hot dry rock geothermal energy and waste heat from sewage for heat exchange to provide heating, cooling, heat storage and cold storage.

[0082] The system has the following advantages:

[0083] (1) This system couples shallow geothermal energy, medium-deep hot dry rock geothermal energy, and waste heat from sewage, and uses ground-source heat pumps, sewage-source heat pumps, cross-seasonal heat storage, and cold and heat storage devices to create a comprehensive energy system, providing users with cooling in summer and heating in winter, and offering a variety of energy supply operation modes.

[0084] (2) Due to the coupling of shallow geothermal energy and medium-deep dry hot rock geothermal energy, the ground-source heat pump of the present invention can improve the equipment efficiency by about 5%-10%, and the shallow geothermal energy can achieve 100% cold and hot balance;

[0085] (3) Due to the addition of the cross-seasonal heat storage system, the utilization rate of medium-deep dry hot rock well equipment can be increased by more than 50%;

[0086] (4) Due to the addition of cold and heat storage devices, this system can improve the economic efficiency of the comprehensive energy project by 5%-10%.

[0087] In order to further illustrate the above-mentioned geothermal coupled sewage source heat pump integrated energy supply system, this embodiment provides a specific description:

[0088] A geothermal coupled sewage source heat pump integrated energy supply system includes a shallow geothermal heat pump well 1, a shallow geothermal water supply pump P-1 and a geothermal water heat exchanger 2 connected in sequence. The shallow geothermal heat pump well 1 is also connected to a shallow geothermal return water pump P-2.

[0089] The geothermal water heat exchanger 2 is connected to the shallow, medium and deep geothermal flow combiner H-1, the medium and deep return flow combiner H-2 and the electric valve a respectively.

[0090] The shallow, medium and deep geothermal confluence H-1 is also connected to the ground source heat pump evaporator 8 and the inter-seasonal heat storage and hot water pump P-7, and the medium and deep return flow confluence H-2 is also connected to the medium and deep dry hot rock return water pump P-4 and the inter-seasonal heat storage and heat storage return water pump P-6.

[0091] The medium-deep hot dry rock return water pump P-4 is simultaneously connected to the medium-deep hot dry rock well 3, the medium-deep hot dry rock water supply pump P-3 and the medium-deep geothermal diverter F-2 in sequence. The medium-deep geothermal diverter F-2 is connected to the electric valve a and the electric valve b respectively.

[0092] The electric valve b is connected to the inter-seasonal heat storage water pump P-5 and the inter-seasonal heat storage buried pipe 4 in sequence. The inter-seasonal heat storage buried pipe 4 is also connected to the electric valve c, the electric valve d and the inter-seasonal heat storage heating return water pump P-8 respectively. The electric valve c is also connected to the inter-seasonal heat storage heat storage return water pump P-6. The electric valve d is also connected to the inter-seasonal heat storage water supply pump P-7. The inter-seasonal heat storage heating return water pump P-8 is also connected to the shallow, medium and deep geothermal diverter F-1. The shallow, medium and deep geothermal diverter F-1 is also connected to the ground source heat pump evaporator 8 and the shallow ground source return water pump P-2 respectively.

[0093] The geothermal heat pump evaporator 8 is also connected to the geothermal heat pump compressor 9 and the geothermal heat pump throttling device 11, the geothermal heat pump compressor 9 is connected to the geothermal heat pump condenser 10, and the geothermal heat pump condenser 10 is also respectively connected to the geothermal heat pump throttling device 11, the geothermal heat pump water supply pump P-14 and the geothermal heat pump return water pump P-15.

[0094] The geothermal heat pump water supply pump P-14 is connected to the geothermal heat pump outlet diverter F-4, the geothermal heat pump return water pump P-15 is connected to the geothermal heat pump return water confluence H-3, the geothermal heat pump outlet diverter F-4 is respectively connected to the electric valve h, electric valve i and electric valve j, the electric valve h is connected to the heat user 19, the electric valve i is connected to the cold and heat storage device 18, and the electric valve j is connected to the cold user 20.

[0095] Heat user 19 is also connected to the ground-source heat pump return water manifold H-3, electric valves p and k, and the sewage-source heat pump return water manifold H-4. Cold and heat storage device 18 is also connected to the energy storage water supply pump P-22, electric valves 1 and n. Cold user 20 is also connected to the ground-source heat pump return water manifold H-3, the sewage-source heat pump return water manifold H-4, electric valves q and m, and the electric refrigeration unit return water pump P-19. The energy storage water supply pump P-22 is connected to the cold and heat storage diverter F-6, which is connected to the electric valves p and q.

[0096] The sewage source heat pump return water junction H-4 is also connected to the sewage source heat pump return water pump P-17 and the sewage source heat pump condenser 14 in sequence. The sewage source heat pump condenser 14 is also connected to the sewage source heat pump water supply pump P-16, the sewage source heat pump compressor 13 and the sewage source heat pump throttling device 15. The sewage source heat pump water supply pump P-16 is also connected to the electric valve k, the electric valve l and the electric valve m respectively.

[0097] The sewage source heat pump compressor 13 is also connected to the sewage source heat pump evaporator 12, and the sewage source heat pump evaporator 12 is also connected to the sewage source heat pump throttling device 15, the electric valve e and the electric valve f. The electric valve e is connected to the sewage source secondary side water supply pump P-12 and the sewage source side heat exchanger 7 in sequence, and the electric valve f is connected to the sewage source secondary side return water pump P-13.

[0098] The sewage source side heat exchanger 7 is also connected to the sewage source secondary side return water pump P-13, the second sewage source primary side water intake pump P-10 and the sewage source return water pump P-11 respectively.

[0099] The second sewage source primary side water intake pump P-10 is connected to the sewage treatment facility 6, and the first sewage source primary side water intake pump P-9 is connected to the sewage trunk pipe 5. The sewage trunk pipe 5 is also connected to the sewage source return water pump P-11.

[0100] The electric refrigeration unit return pump P-19 is connected to the electric refrigeration unit 16. The electric refrigeration unit 16 is also connected to the electric refrigeration unit water supply pump P-18, the electric valve g and the circulating cooling water supply pump P-20 respectively. The electric valve g is connected to the circulating cooling water return pump P-21, the cooling tower 17, and the circulating cooling water supply pump P-20 in sequence. The electric refrigeration unit water supply pump P-18 is connected to the electric refrigeration unit refrigerant water outlet diverter F-3. The electric refrigeration unit refrigerant water outlet diverter F-3 is respectively connected to the electric valve n and the electric valve o.

[0101] The working mode of the geothermal coupled sewage source heat pump integrated energy supply system is:

[0102] The hot water (9-15℃) exchanged in the shallow geothermal heat pump well 1 is supplied to the geothermal water heat exchanger 2 through the shallow geothermal water supply pump P-1 to absorb heat and heat up. After being merged by the shallow, middle and deep geothermal merger H-1, it enters the geothermal heat pump evaporator 8 as a heat source for heat exchange (absorbing heat in summer and releasing heat in winter). After being diverted by the shallow, middle and deep geothermal diverter F-1, it is pumped into the shallow geothermal heat pump well 1 by the shallow geothermal return pump P-2 to extract heat again, completing the shallow geothermal heat exchange cycle.

[0103] The hot water (30-45°C) exchanged in the medium-deep hot dry rock well 3 is divided into two parts through the medium-deep hot dry rock water supply pump P-3 and the medium-deep geothermal diverter F-2. One part goes to the geothermal water heat exchanger 2 through the electric valve a to release heat, and then goes to the medium-deep hot dry rock well 3 to absorb heat through the medium-deep return flow combiner H-2 and the medium-deep hot dry rock return water pump P-4, completing part of the medium-deep hot dry rock hot water heat exchange cycle; the other part goes through the electric valve b and the inter-seasonal heat storage water pump P-5 to release heat in the inter-seasonal heat storage buried pipe 4, and then passes through the electric valve c, and is merged by the inter-seasonal heat storage water return pump P-6 through the medium-deep return flow combiner H-2, and is pumped into the medium-deep hot dry rock well 3 by the medium-deep hot dry rock return water pump P-4 to absorb heat, completing the medium-deep hot dry rock hot water heat storage link. At the same time, when the inter-seasonal heat storage buried pipe 4 releases energy in winter, the released hot water passes through the electric valve d and is pumped by the inter-seasonal heat storage hot water pump P-7 to the shallow, medium and deep geothermal merge H-1, enters the ground source heat pump evaporator 8 as a heat source to release heat, and then is diverted by the shallow, medium and deep geothermal diverter F-1, and then transported back to the inter-seasonal heat storage buried pipe 4 by the inter-seasonal heat storage heating return pump P-8 to extract heat again, completing the medium and deep dry hot rock hot water release link.

[0104] After the working fluid of the geothermal heat pump exchanges heat in the geothermal heat pump evaporator 8 (releasing heat in summer and taking in heat in winter), it passes through the geothermal heat pump compressor 9 and then exchanges heat in the geothermal heat pump condenser 10 (taking in heat in summer and releasing heat in winter). After that, it is throttled by the geothermal heat pump throttling device 11 and enters the geothermal heat pump evaporator 8, completing the working fluid cycle.

[0105] After the hot (cold) medium water exchanges heat in the ground source heat pump condenser 10 (releasing heat in summer and taking heat in winter), it is transported to the ground source heat pump outlet diverter F-4 through the ground source heat pump water supply pump P-14, and is respectively transported to the cold storage device 18 for storage through the electric valve i, and transported to the heat user 19 for heating through the electric valve h, and transported to the cold user 20 for cooling through the electric valve i for the cold storage device. The hot (cold) medium water stored in 18 is used by The energy storage water supply pump P-22 delivers the water to the cold storage and heat storage diverter F-6, and then delivers the water to the heat user 19 for heating through the electric valve p, and delivers the water to the cold user 20 for cooling through the electric valve q. After providing heating to the heat user 19 and providing cooling to the cold user 20, the hot medium water is returned to the ground source heat pump condenser 10 by the ground source heat pump return water pump P-15 after merging through the ground source heat pump return water manifold H-3, completing the hot (cold) medium water heating or cooling cycle.

[0106] Sewage from the sewage main pipe 5 is pumped by the primary-side intake pump P-9 of the first sewage source to the sewage treatment facility 6 for pretreatment. This facility includes coarse-fine screens, grit chambers, and other equipment, selected based on the sewage cleanliness level at the project site. The pretreated sewage is pumped by the primary-side intake pump P-10 of the second sewage source to the sewage source-side heat exchanger 7. After heat exchange with the secondary hot water, it is returned to the sewage main pipe via the sewage source return pump P-11, achieving heat exchange with raw sewage or recycled water (heat absorption in summer and heat release in winter).

[0107] After absorbing heat in the sewage source-side heat exchanger 7, the secondary-exchange hot water is transported by the sewage source secondary-side water supply pump P-12 through the electric valve e to the sewage source heat pump evaporator 12 as a heat source for heat release or heat absorption as a cold source. It is then transported back to the sewage source-side heat exchanger 7 through the electric valve f and the sewage source secondary-side return water pump P-13 for further heat exchange. The sewage source heat pump working fluid exchanges heat in the sewage source heat pump evaporator 12 (releasing heat in summer and absorbing heat in winter), passes through the sewage source heat pump compressor 13, and then exchanges heat in the sewage source heat pump condenser 14 (absorbing heat in summer and releasing heat in winter). It is then throttled by the throttling device of the sewage source heat pump 15 and enters the ground source heat pump evaporator 8, completing the working fluid cycle.

[0108] After the hot (cold) medium water exchanges heat in the sewage source heat pump condenser 14 (releasing heat in summer and taking heat in winter), it is transported to the sewage source heat pump F-5 outlet diverter through the sewage source heat pump P-16 water supply pump, and is respectively transported to the cold and heat storage device 18 for storage through the electric valve 1, and is transported to the hot user 19 for heating through the electric valve k, and is transported to the cold user 20 for cooling through the electric valve m. After providing heat to the hot user 19 and the refrigerant water after providing cooling to the cold user 20, they are transported back to the sewage source heat pump condenser 14 by the sewage source heat pump P-17 return water pump after merging through the sewage source heat pump return water manifold H-4, completing the hot (cold) medium water heating or cooling cycle.

[0109] The refrigerant water at the outlet of the electric refrigeration unit 16 is transported to the refrigerant water outlet diverter F-3 of the electric refrigeration unit through the electric refrigeration unit water supply pump P-18, and is regulated by the diverter. A part of it is transported to the cold and heat storage device 18 for storage through the electric valve n, and a part of it is transported to the cold user 20 for cooling through the electric valve o. After providing cooling for the cold user 20, the refrigerant water is transported back to the electric refrigeration unit 16 through the electric refrigeration unit return pump P-19 to complete the cooling cycle. At the same time, the electric refrigeration circulating cooling water is transported to the cooling tower 17 by the circulating cooling water return pump P-21 for cooling through the electric valve g, and then transported to the electric refrigeration unit 16 by the circulating cooling water supply pump P-20 to complete the cooling water cycle.

[0110] In order to further illustrate the above-mentioned geothermal-coupled sewage source heat pump integrated energy supply system, this embodiment also provides an operation method of the geothermal-coupled sewage source heat pump integrated energy supply system, which includes a conventional heating mode in winter, a heat storage mode in winter, a peak-shaving heating mode in winter, a cooling mode in summer, a cooling mode in summer, a peak-shaving mode in summer and a heat storage mode in transition season.

[0111] Winter conventional heating mode, winter heat storage mode, winter peak-shaving heating mode, summer cooling mode, summer cooling storage mode, summer peak-shaving mode and transition season heat storage mode, in the above working modes:

[0112] 1. Conventional heating mode in winter: the shallow geothermal coupled medium-deep hot dry rock heating system, the sewage source heat pump heating system, and the inter-seasonal heat storage buried pipe heating system are started; the inter-seasonal heat storage system, the cold and heat storage device, and the electric refrigeration unit are shut down; that is, the electric valve b, electric valve c, electric valve i, electric valve l, electric valve p, electric valve q, electric valve j, electric valve m, electric valve n, electric valve o, and electric valve g are shut down; the inter-seasonal heat storage water pump P-5, the inter-seasonal heat storage return pump P-6, the electric refrigeration unit supply pump P-18, the electric refrigeration unit return pump P-19, the circulating cooling water supply pump P-20, the circulating cooling water return pump P-21, and the energy storage supply pump P-22 are shut down, and other equipment operates normally (the other equipment mentioned here refers to other equipment in the system except the valves and pumps mentioned above) to provide heat to heat users.

[0113] 2 Winter heating and heat storage mode: The shallow geothermal coupled medium and deep hot dry rock heating system, the sewage source heat pump heating system, the inter-seasonal heat storage buried pipe heating system, and the heat storage mode of the cold and heat storage device are started; the inter-seasonal heat storage system and the electric refrigeration unit are shut down, that is, the electric valve b, electric valve c, electric valve p, electric valve q, electric valve j, electric valve m, electric valve n, electric valve o and electric valve g are shut down; the inter-seasonal heat storage water pump P-5, the inter-seasonal heat storage return pump P-6, the electric refrigeration unit supply pump P-18, the electric refrigeration unit return pump P-19, the circulating cooling water supply pump P-20, the circulating cooling water return pump P-21, and the energy storage supply pump P-22 are shut down, and other equipment operates normally (the other equipment mentioned here refers to other equipment in the system except the valves and pumps mentioned above), providing heat to heat users and storing heat for the cold and heat storage device.

[0114] 3. Winter peak-shaving heating mode: shallow geothermal coupled with medium-deep hot dry rock heating system, sewage source heat pump heating system, inter-seasonal heat storage buried pipe heating system, and cold and heat storage device heating mode are started; the inter-seasonal heat storage system and the electric refrigeration unit are shut down; that is, electric valve b, electric valve c, electric valve i, electric valve l, electric valve q, electric valve j, electric valve m, electric valve n, electric valve o and electric valve g are shut down; the inter-seasonal heat storage water pump P-5, the inter-seasonal heat storage return pump P-6, the electric refrigeration unit supply pump P-18, the electric refrigeration unit return pump P-19, the circulating cooling water supply pump P-20, and the circulating cooling water return pump P-21 are shut down, and other equipment operates normally (the other equipment mentioned here refers to other equipment in the system except the valves and pumps mentioned above), providing heat to heat users, and using the heat stored in the cold and heat storage device for heating peak regulation.

[0115] 4 Summer cooling mode: shallow geothermal cooling system, sewage source heat pump cooling system, electric refrigeration machine cooling system, and inter-seasonal heat storage system are started; the medium and deep hot dry rock heating system, inter-seasonal heat storage buried pipe heating system, and cold and heat storage device are shut down; that is, electric valve a, electric valve d, electric valve i, electric valve l, electric valve p, electric valve q, electric valve h, electric valve k, and electric valve n are shut down; the inter-seasonal heat storage hot water pump P-7, the inter-seasonal heat storage heating return water pump P-8, and the energy storage water supply pump P-22 are shut down, and other equipment operates normally (the other equipment mentioned here refers to other equipment in the system except the valves and water pumps mentioned above) to provide cooling for cold users.

[0116] 5. Summer cold storage mode: shallow geothermal cooling system, sewage source heat pump cooling system, electric refrigeration machine cooling system, inter-seasonal heat storage system are started, and cold storage mode of cold storage device is started; medium and deep hot dry rock heating system and inter-seasonal heat storage buried pipe heating system are shut down; that is, electric valve a, electric valve d, electric valve p, electric valve q, electric valve h, and electric valve k are shut down; inter-seasonal heat storage hot water pump P-7, inter-seasonal heat storage heating return water pump P-8, and energy storage water supply pump P-22 are shut down, and other equipment operates normally (the other equipment mentioned here refers to other equipment in the system except the valves and water pumps mentioned above), providing cold for cold users and storing cold for cold storage device.

[0117] 6 Summer peak-shaving mode: shallow geothermal cooling system, sewage source heat pump cooling system, electric refrigeration machine cooling system, inter-seasonal heat storage system, and cold storage device cooling mode are started; medium and deep hot dry rock heating system, and inter-seasonal heat storage buried pipe heating system; that is, electric valve a, electric valve d, electric valve p, electric valve h, and electric valve k are closed; the inter-seasonal heat storage hot water pump P-7 and the inter-seasonal heat storage heating return pump P-8 are closed, and other equipment operates normally (the other equipment mentioned here refers to other equipment in the system except the valves and water pumps mentioned above), providing cooling for cold users, and using the cold storage capacity of the cold storage device for cooling peak regulation.

[0118] 7 Transition season heat storage mode: only open electric valve b and electric valve c, start the medium-deep dry hot rock water supply pump P-3, the medium-deep dry hot rock return water pump P-4, the inter-seasonal heat storage water pump P-5, and the inter-seasonal heat storage return water pump P-6, and close other equipment and valves (the other equipment mentioned here refers to other equipment in the system except the valves and water pumps mentioned above). Use the medium-deep dry hot rock heating system to store heat for the inter-seasonal heat storage buried pipe for winter heating.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 geothermal coupled sewage source heat pump integrated energy supply system, characterized in that: Including geothermal heat pump system, shallow geothermal system, medium and deep geothermal system, cross-seasonal heat storage system, sewage source heat pump system and sewage heating system; The mid-deep geothermal system is connected to the geothermal water heat exchanger via a first circulation pipeline, and is connected to the inter-seasonal heat storage system via a second circulation pipeline; The shallow geothermal system is connected to a geothermal water heat exchanger, and the water supply of the shallow geothermal system is heat-exchanged with the water supply of the medium-deep geothermal system in the geothermal water heat exchanger before being heat-exchanged with the ground source heat pump system; The inter-seasonal heat storage system is connected to the ground source heat pump system through a third circulation pipeline to perform heat exchange; The sewage source heat pump system is connected to the sewage heating system; The ground source heat pump system and sewage source heat pump system utilize shallow geothermal energy, medium and deep hot dry rock geothermal energy and waste heat from sewage to provide heating, cooling, heat storage and cold storage; The shallow geothermal system includes a shallow geothermal heat pump well, a shallow geothermal water supply pump and a shallow geothermal return water pump; The shallow geothermal heat pump well, the shallow geothermal water supply pump and the geothermal water heat exchanger are connected in sequence, and the shallow geothermal heat pump well is also connected to the shallow geothermal return water pump; The geothermal water heat exchanger is connected to the shallow, medium and deep geothermal concentrator, the shallow, medium and deep geothermal concentrator is also connected to the ground source heat pump evaporator of the ground source heat pump system, the ground source heat pump evaporator is connected to the shallow, medium and deep geothermal diverter, and the shallow, medium and deep geothermal diverter is connected to the shallow ground source return water pump; The medium-deep geothermal system includes a medium-deep return flow combiner, a medium-deep hot dry rock well, a medium-deep hot dry rock return water pump, a medium-deep hot dry rock water supply pump, an electric valve a and an electric valve b; The geothermal water heat exchanger is also connected to the mid-deep layer return flow combiner and the electric valve a, and the mid-deep layer return flow combiner is also connected to the mid-deep layer dry hot rock return water pump; The medium-deep hot dry rock return water pump is simultaneously connected to the medium-deep hot dry rock well, the medium-deep hot dry rock water supply pump and the medium-deep geothermal diverter in sequence, and the medium-deep geothermal diverter is connected to the electric valve a and the electric valve b respectively; The inter-seasonal heat storage system includes an inter-seasonal heat storage water pump, an inter-seasonal heat storage buried pipe, an electric valve c, an electric valve d, an inter-seasonal heat storage return water pump, an inter-seasonal heat storage hot water pump and an inter-seasonal heat storage heating return water pump; The mid-deep return flow combiner is also connected to the inter-seasonal heat storage return water pump; The shallow, medium and deep geothermal confluence devices are also connected to the inter-seasonal heat storage and hot water pumps; The electric valve b is connected to the inter-seasonal heat storage water pump and the inter-seasonal heat storage buried pipe in sequence. The inter-seasonal heat storage buried pipe is also connected to the electric valve c, the electric valve d and the inter-seasonal heat storage heating return water pump respectively; The electric valve c is also connected to the inter-seasonal heat storage return water pump, the electric valve d is also connected to the inter-seasonal heat storage hot water pump, and the inter-seasonal heat storage heating return water pump is also connected to the shallow, medium and deep geothermal diverter; The ground source heat pump system also includes a ground source heat pump compressor, a ground source heat pump condenser and a ground source heat pump throttling device; The ground source heat pump evaporator is also connected to the ground source heat pump compressor and the ground source heat pump throttling device, the ground source heat pump compressor is connected to the ground source heat pump condenser, and the ground source heat pump condenser is connected to the ground source heat pump throttling device; The ground source heat pump condenser is also connected to the ground source heat pump water supply pump and the ground source heat pump return water pump, the ground source heat pump water supply pump is connected to the ground source heat pump outlet manifold, and the ground source heat pump return water pump is connected to the ground source heat pump return water manifold; The water outlet diverter of the ground source heat pump is connected to the electric valve h, electric valve i and electric valve j respectively. The electric valve h is connected to the heat user, the electric valve i is connected to the cold and heat storage device, and the electric valve j is connected to the cold user. The heat users are also connected to the ground source heat pump return water manifold, electric valve p, electric valve k and sewage source heat pump return water manifold respectively; The cold and heat storage device is also connected to the energy storage water supply pump, electric valve l and electric valve n respectively; The cold users are also connected to the ground source heat pump return water merger, the sewage source heat pump return water merger, the electric valve q, the electric valve m and the electric refrigeration unit return water pump respectively. The energy storage water supply pump is connected to the cold and heat storage diverter, and the cold and heat storage diverter is connected to the electric valve p and the electric valve q respectively.

2. The geothermal coupled sewage source heat pump integrated energy supply system according to claim 1 is characterized in that: The sewage source heat pump system includes a sewage source heat pump return pump, a sewage source heat pump condenser, a sewage source heat pump compressor, a sewage source heat pump throttling device and a sewage source heat pump evaporator; The sewage source heat pump return water manifold is also connected to the sewage source heat pump return water pump and the sewage source heat pump condenser in sequence; The sewage source heat pump condenser is also connected to a sewage source heat pump water supply pump, a sewage source heat pump compressor and a sewage source heat pump throttling device; The sewage source heat pump water supply pump is also connected to the electric valve k, electric valve l and electric valve m respectively; The sewage source heat pump compressor is also connected to the sewage source heat pump evaporator.

3. The geothermal coupled sewage source heat pump integrated energy supply system according to claim 2 is characterized in that: The sewage source heat pump evaporator is also connected to the sewage source heat pump throttling device, electric valve e and electric valve f. The electric valve e is connected to the sewage source secondary side water supply pump and the sewage source side heat exchanger in sequence. The electric valve f is connected to the sewage source secondary side return water pump. The sewage heating system includes sewage trunk pipes and sewage treatment facilities; The sewage source side heat exchanger is also connected to the sewage source secondary side return water pump, the second sewage source primary side water intake pump and the sewage source return water pump respectively; The primary side water intake pump of the second sewage source is connected to the sewage treatment facility, and the primary side water intake pump of the first sewage source is connected to the sewage trunk pipe in sequence. The sewage trunk pipe is also connected to the sewage source return water pump.

4. The geothermal coupled sewage source heat pump integrated energy supply system according to claim 3 is characterized in that: It also includes a return pump of the electric refrigeration unit connected to the electric refrigeration unit; The electric refrigeration unit is also connected to the electric refrigeration unit water supply pump, the electric valve g and the circulating cooling water supply pump, and the electric valve g is connected to the circulating cooling water return pump, the cooling tower, and the circulating cooling water supply pump in sequence; The water supply pump of the electric refrigeration unit is connected to the refrigerant water outlet diverter of the electric refrigeration unit, and the refrigerant water outlet diverter of the electric refrigeration unit is respectively connected to the electric valve n and the electric valve o.

5. A method for operating a geothermal coupled sewage source heat pump integrated energy supply system, characterized in that: The method controls the operation of the geothermal coupled sewage source heat pump integrated energy supply system as claimed in claim 4, wherein the geothermal coupled sewage source heat pump integrated energy supply system includes multiple operating modes, and the geothermal coupled sewage source heat pump integrated energy supply system is switched between different operating modes by controlling the working states of different valves and water pumps; The various working modes are: Conventional heating mode in winter: In this working mode, close the electric valve b, electric valve c, electric valve i, electric valve l, electric valve p, electric valve q, electric valve j, electric valve m, electric valve n, electric valve o and electric valve g; Shut down the inter-seasonal thermal storage water pump, inter-seasonal thermal storage return pump, electric refrigeration unit water supply pump, electric refrigeration unit return pump, circulating cooling water supply pump, circulating cooling water return pump, and energy storage water supply pump, while other equipment operates normally to supply heat to heat users; Winter heating and heat storage mode: In this working mode, close the electric valve b, electric valve c, electric valve p, electric valve q, electric valve j, electric valve m, electric valve n, electric valve o and electric valve g; Shut down the inter-seasonal thermal storage water pump, inter-seasonal thermal storage return pump, electric refrigeration unit water supply pump, electric refrigeration unit return pump, circulating cooling water supply pump, circulating cooling water return pump, and energy storage water supply pump. Other equipment will operate normally to supply heat to heat users and store heat for the cold and heat storage device. Winter peak-shaving heating mode: In this working mode, close the electric valve b, electric valve c, electric valve i, electric valve l, electric valve q, electric valve j, electric valve m, electric valve n, electric valve o and electric valve g; Shut down the inter-seasonal thermal storage water pump, inter-seasonal thermal storage return pump, electric refrigeration unit water supply pump, electric refrigeration unit return pump, circulating cooling water supply pump, and circulating cooling water return pump. Other equipment will operate normally to supply heat to heat users, and at the same time, the heat stored in the cold and heat storage device will be used for peak heating regulation. Summer cooling mode: In this working mode, electric valves a, d, i, l, p, q, h, k and n are closed; the inter-seasonal heat storage hot water pump, the inter-seasonal heat storage return water pump and the energy storage water supply pump are closed, while other equipment operates normally to supply cooling to cold users; Summer cooling mode: In this working mode, electric valves a, d, p, q, h and k are closed; the inter-seasonal heat storage hot water pump, the inter-seasonal heat storage return water pump and the energy storage water supply pump are closed, and other equipment operates normally to supply cold to cold users and store cold for the cold and heat storage device. Summer peak load mode: In this working mode, electric valves a, d, p, h and k are closed; the inter-seasonal heat storage hot water pump and the inter-seasonal heat storage heating return water pump are closed, and other equipment operates normally to provide cooling for cold users, while the cooling capacity stored in the cold and heat storage device is used for cooling peak regulation; Transition season heat storage mode: In this working mode, only electric valve b and electric valve c are opened, and the medium-deep hot dry rock water supply pump, medium-deep hot dry rock return pump, inter-seasonal heat storage water pump, and inter-seasonal heat storage return pump are started. Other equipment and valves are closed, and the medium-deep hot dry rock heating system is used to store heat for the inter-seasonal heat storage buried pipe for winter heating.

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