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

Abstract

The invention relates to the technical field of energy supply systems, in particular to a geothermal coupling sewage source heat pump comprehensive energy supply system and an operation method. The system comprises a ground source heat pump system, a shallow geothermal system, a middle-deep geothermal system, a cross-seasonal heat storage system, a sewage source heat pump system and a sewage heat supply system. According to the system, shallow-layer terrestrial heat, middle-deep-layer dry hot rock terrestrial heat and sewage waste heat are coupled, the ground source heat pump, the sewage source heat pump and the cross-seasonal heat storage and cold and heat storage device are used for building a comprehensive energy system, cold supply in summer and heat supply in winter are achieved for users, and multiple energy supply operation modes are provided. Due to the coupling of the shallow geothermal heat and the middle-deep layer dry hot rock geothermal heat, the ground source heat pump can improve the equipment efficiency by about 5%-10%, and cold and heat balance of the shallow geothermal heat is achieved by 100%; due to the addition of the cross-seasonal heat storage system, the utilization rate of middle-deep layer dry hot rock well equipment can be improved by more than 50%; and by adding a cold and heat storage device, the economical efficiency of a comprehensive energy project can be improved 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] Clean, low-carbon, efficient and intelligent integrated energy systems are a strong support for new power systems. In the field of heating, the development and utilization of renewable energy is an important way to reduce heating energy consumption and carbon emissions. In heating technology, the use of deep and shallow geothermal and sewage waste heat heating technology is an important research direction. Shallow geothermal energy is a low-temperature thermal energy resource stored within hundreds of meters of the earth's shallow surface. It mainly comes from solar radiation and the geothermal warming effect inside the earth. It is clean, renewable, efficient and widely distributed. Deep geothermal energy refers to geothermal resources located within 1,000 meters below the earth's surface, with a temperature usually between 70℃ and 200℃. At the same time, my country has a vast territory, and the available deep and medium geothermal resources in various regions are different. At present, dry hot rock geothermal, which takes heat but not water, has greater development potential because it is more environmentally friendly. Ground source heat pump technology uses geothermal resources for heating and cooling, and has the characteristics of high efficiency and energy saving, which can effectively reduce dependence on traditional energy. 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 forms of energy have their own characteristics and advantages. How to adapt to local conditions, give full play to the role of shallow geothermal, medium and deep hot dry rocks, and waste heat of sewage, couple multiple energy sources, realize the complementary utilization of energy, 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, a cross-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 exchanges heat with the water supply of the medium-deep geothermal system in the geothermal water heat exchanger and then exchanges heat 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 to provide heating, cooling, heat storage and cold storage.

[0011] Preferably, the shallow geothermal system comprises a shallow geothermal heat pump well, a shallow geothermal water supply pump and a shallow geothermal water return 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 concentrators, the shallow, medium and deep geothermal concentrators are 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 diverters, and the shallow, medium and deep geothermal diverters are connected to the shallow geothermal return water pump.

[0014] Preferably, the medium-deep geothermal system comprises a medium-deep return flow collector, 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 middle-deep layer return flow combiner and the electric valve a, and the middle-deep layer return flow combiner is also connected to the middle-deep layer dry hot rock return water pump;

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

[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 heat return pump, an inter-seasonal heat storage hot water pump and an inter-seasonal heat storage heating return 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 concentrators 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 underground pipe in sequence, and the inter-seasonal heat storage underground 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 diverters.

[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 geothermal heat pump evaporator is also connected to the geothermal heat pump compressor and the geothermal heat pump throttling device, the geothermal heat pump compressor is connected to the geothermal heat pump condenser, and the geothermal heat pump condenser is connected to the geothermal 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 water divider, 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, the electric valve i and the 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 the 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, the electric valve l and the 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 comprises 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, and 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, which controls the operation of the geothermal-coupled sewage source heat pump integrated energy supply system as described above, and the geothermal-coupled sewage source heat pump integrated energy supply system includes multiple working modes, and the geothermal-coupled sewage source heat pump integrated energy supply system is switched between different working modes by controlling the working states of different valves and water pumps;

[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, and 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 operates 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 heat storage water pump, inter-seasonal heat 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 use the heat stored in the cold and heat storage device for peak heating.

[0052] Summer cooling mode:

[0053] In this working mode, 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 closed; the inter-seasonal heat storage heating water pump, the inter-seasonal heat storage heating return pump, and the energy storage water supply pump are closed, and other equipment operates normally to provide cooling for cold users;

[0054] Summer cooling mode:

[0055] In this working mode, electric valve a, electric valve d, electric valve p, electric valve q, electric valve h, and electric valve k are closed; the inter-seasonal heat storage hot water pump, the inter-seasonal heat storage heating return 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 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 and the inter-seasonal heat storage heating return water pump are closed, and other equipment operates normally to provide cooling for cold users, and at the same time, the cold storage capacity of 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 providing a variety of energy supply operation modes.

[0062] (2) Due to the coupling of shallow geothermal energy and medium-deep hot dry 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 hot dry 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 implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0067] Description of reference numerals:

[0068] 1. Shallow ground source heat pump well; 2. Geothermal water heat exchanger; 3. Medium and deep dry hot rock well; 4. Inter-seasonal heat storage buried pipe; 5. Sewage main pipe; 6. Sewage treatment facilities; 7. Sewage source side heat exchanger; 8. Ground source heat pump evaporator; 9. Ground source heat pump compressor; 10. Ground source heat pump condenser; 11. Ground source 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. Cold tower; 18. Cold and heat storage device; 19. Heat users; 20. Cold 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, cross-seasonal heat storage water storage pump; P-6, cross-seasonal heat storage water storage return water pump; P-7, cross-seasonal heat storage water supply pump; P-8, cross-seasonal heat storage heating 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; 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 confluence; H-3, ground source heat pump return confluence; H-4, sewage source heat pump return confluence;

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

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

[0073] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 indicate orientations or positional relationships based on the orientations 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0075] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the 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 indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to 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 mid-deep geothermal system is connected to the geothermal water heat exchanger through a first circulation pipeline, and is connected to the inter-seasonal heat storage system through a 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 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] The ground source heat pump system and sewage source heat pump system 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 providing a variety of energy supply operation modes.

[0084] (2) Due to the coupling of shallow geothermal energy and medium-deep hot dry 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 hot dry 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, and 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 respectively 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.

[0090] The shallow, medium and deep geothermal confluence unit H-1 is also connected to the ground source heat pump evaporator 8 and the inter-seasonal heat storage hot water supply pump P-7, and the medium and deep return confluence unit H-2 is also connected to the medium and deep dry hot rock return water pump P-4 and the inter-seasonal 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, and the medium-deep geothermal diverter F-2 is respectively connected to the electric valve a and the electric valve b.

[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 pump P-8 respectively. The electric valve c is also connected to the inter-seasonal heat storage heat return 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 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 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 water divider F-4, the geothermal heat pump return water pump P-15 is connected to the geothermal heat pump return water collector H-3, the geothermal heat pump outlet water divider 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] The heat user 19 is also connected to the ground source heat pump return water concentrator H-3, electric valve p, electric valve k and sewage source heat pump return water concentrator H-4 respectively, the cold storage and heat storage device 18 is also connected to the energy storage water supply pump P-22, electric valve l and electric valve n respectively, and the cold user 20 is also connected to the ground source heat pump return water concentrator H-3, sewage source heat pump return water concentrator H-4, electric valve q, electric valve m and electric refrigeration unit return water pump P-19 respectively. The energy storage water supply pump P-22 is connected to the cold storage and heat storage diverter F-6, and the cold storage and heat storage diverter F-6 is connected to the electric valve p and the electric valve q respectively.

[0096] The sewage source heat pump return water manifold H-4 is also connected in sequence with the sewage source heat pump return water pump P-17 and the sewage source heat pump condenser 14. The sewage source heat pump condenser 14 is also connected with 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 respectively connected with the electric valve k, the electric valve l and the electric valve m.

[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, electric valve e and 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 in sequence. 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, and the electric refrigeration unit 16 is also respectively connected to the electric refrigeration unit supply pump P-18, the electric valve g and the circulating cooling water supply pump P-20, 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 supply pump P-18 is connected to the electric refrigeration unit refrigerant water outlet diverter F-3, and 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 by 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 water pump P-2 to extract heat again, completing the shallow geothermal heat exchange cycle.

[0103] The hot water (30-45℃) 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 passes through the electric valve b and the inter-seasonal heat storage water storage 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 storage return pump P-6 through the medium-deep return flow combiner H-2, and then 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, middle and deep geothermal merger H-1, and enters the ground source heat pump evaporator 8 as a heat source to release heat. After being diverted by the shallow, middle and deep geothermal diverter F-1, it is 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 middle 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 water distributor F-4 through the ground source heat pump water supply pump P-14, and then transported to the cold storage device 18 for storage through the electric valve i, transported to the hot user 19 for heating through the electric valve h, and transported to the cold user 20 for cooling through the electric valve i. 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 hot 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 for the hot user 19 and providing cooling for the cold user 20, the hot medium water is transported back to the ground source heat pump condenser 10 by the ground source heat pump return water pump P-15 after converging at the ground source heat pump return water manifold H-3, completing the hot (cold) medium water heating or cooling cycle.

[0106] The sewage in the sewage main pipe 5 is transported to the sewage treatment facility 6 for pretreatment through the first sewage source primary side water intake pump P-9. The sewage treatment facility 6 includes coarse and fine screens, grit chambers and other facilities, which are selected according to the cleanliness of the sewage at the project location. The pretreated sewage is transported to the sewage source side heat exchanger 7 through the second sewage source primary side water intake pump P-10, and after heat exchange with the secondary hot water, it is transported back to the sewage main pipe through the sewage source return pump P-11 to achieve heat exchange of 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 exchanged hot water is transported to the sewage source heat pump evaporator 12 by the sewage source secondary side water supply pump P-12 through the electric valve e as a heat source to release heat or absorb heat as a cold source, and 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 heat exchange again. After the sewage source heat pump working fluid exchanges heat in the sewage source heat pump evaporator 12 (releasing heat in summer and taking heat in winter), it passes through the sewage source heat pump compressor 13, exchanges heat in the sewage source heat pump condenser 14 (taking heat in summer and releasing heat in winter), and then throttles through the throttling device of the sewage source heat pump 15, enters the ground source heat pump evaporator 8, and completes 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 l, 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. The hot medium water after heating the hot user 19 and the refrigerant water after cooling the cold user 20 are transported back to the sewage source heat pump condenser 14 by the sewage source heat pump P-17 return water pump after converging at 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 cold tower 17 for cooling by the circulating cooling water return pump P-21 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, the present embodiment also provides a geothermal coupled sewage source heat pump integrated energy supply system operation method, the method includes winter conventional heating mode, winter heat storage mode, winter peak-shaving heating, summer cooling mode, summer cooling mode, summer peak-shaving mode and transition season heat storage mode.

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

[0112] 1 Conventional heating mode in winter: shallow geothermal coupled medium and deep hot dry rock heating system, sewage source heat pump heating system, and inter-seasonal heat storage buried pipe heating system are started; inter-seasonal heat storage system, cold storage device, and electric refrigeration unit are shut down; that is, 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; inter-seasonal heat storage water pump P-5, inter-seasonal heat storage return pump P-6, electric refrigeration unit supply pump P-18, electric refrigeration unit return pump P-19, circulating cooling water supply pump P-20, circulating cooling water return pump P-21, 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 heating for heat users.

[0113] 2 Winter heating and heat storage mode: shallow geothermal coupled medium and 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 heat storage mode 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 water 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, 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 pumps mentioned above), providing heat for heat users and storing heat for the cold and heat storage device at the same time.

[0114] 3 Winter peak-shaving heating mode: shallow geothermal coupled medium-deep hot dry rock heating system, sewage source heat pump heating system, inter-seasonal heat storage buried pipe heating system, and cold storage device heating mode 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 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 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 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 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, and cold storage mode of cold storage device are 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 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 cooling for cold users and storing cold for cold storage devices.

[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 start-up, cold storage device cooling mode start-up; medium and deep hot dry rock heating system, inter-seasonal heat storage buried pipe heating system; that is, close electric valve a, electric valve d, electric valve p, electric valve h, electric valve k; close inter-seasonal heat storage hot water pump P-7, inter-seasonal heat storage heating return pump P-8, 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), provide cooling for cold users, and use the cold stored in the cold storage device for cooling peak regulation.

[0118] 7 Transitional season heat storage mode: only open electric valve b and electric valve c, start the medium-deep hot dry rock water supply pump P-3, the medium-deep hot dry rock return pump P-4, the inter-seasonal heat storage water pump P-5, and the inter-seasonal heat storage return 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), and use the medium-deep hot dry 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned 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, inter-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 exchanges heat with the water supply of the medium-deep geothermal system in the geothermal water heat exchanger and then exchanges heat 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 for heat exchange to provide heating, cooling, heat storage and cold storage.

2. The geothermal coupled sewage source heat pump integrated energy supply system according to claim 1 is characterized in that: The shallow geothermal system includes a shallow geothermal heat pump well, a shallow geothermal water supply pump and a shallow geothermal water return 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 concentrators, the shallow, medium and deep geothermal concentrators are 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 diverters, and the shallow, medium and deep geothermal diverters are connected to the shallow geothermal return water pump.

3. The geothermal coupled sewage source heat pump integrated energy supply system according to claim 2 is characterized in that: The medium-deep geothermal system includes a medium-deep return flow collector, 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 middle-deep layer return flow combiner and the electric valve a, and the middle-deep layer return flow combiner is also connected to the middle-deep layer dry hot rock return water pump; The medium-deep hot dry rock return water pump is simultaneously connected in sequence to the medium-deep hot dry rock well, the medium-deep hot dry rock water supply pump and the medium-deep geothermal diverter, and the medium-deep geothermal diverter is respectively connected to the electric valve a and the electric valve b.

4. The geothermal coupled sewage source heat pump integrated energy supply system according to claim 3 is characterized in that: The inter-seasonal heat storage system includes an inter-seasonal heat storage water pump, an inter-seasonal heat storage underground pipe, an electric valve c, an electric valve d, an inter-seasonal heat storage water return pump, an inter-seasonal heat storage water supply pump and an inter-seasonal heat storage water supply return 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 concentrators 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 underground pipe in sequence, and the inter-seasonal heat storage underground 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 heat return pump, the electric valve d is also connected to the inter-seasonal heat storage heating water pump, and the inter-seasonal heat storage heating return pump is also connected to the shallow, medium and deep geothermal diverters.

5. The geothermal coupled sewage source heat pump integrated energy supply system according to claim 4 is characterized in that: 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 geothermal heat pump evaporator is also connected to the geothermal heat pump compressor and the geothermal heat pump throttling device, the geothermal heat pump compressor is connected to the geothermal heat pump condenser, and the geothermal heat pump condenser is connected to the geothermal heat pump throttling device.

6. The geothermal coupled sewage source heat pump integrated energy supply system according to claim 5 is characterized in that: 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 water divider, 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, the electric valve i and the 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 the sewage source heat pump return water manifold respectively; The cold and heat storage device is also connected to the energy storage water supply pump, the electric valve l and the 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.

7. The geothermal coupled sewage source heat pump integrated energy supply system according to claim 6 is characterized in that: The sewage source heat pump system comprises 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.

8. The geothermal coupled sewage source heat pump integrated energy supply system according to claim 7 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 a sewage main 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, and the sewage trunk pipe is also connected to the sewage source return water pump.

9. The geothermal coupled sewage source heat pump integrated energy supply system according to claim 8 is characterized in that: It also includes an electric refrigeration unit return pump 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.

10. An operating method of 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 9, wherein the geothermal coupled sewage source heat pump integrated energy supply system includes multiple working modes, and the geothermal coupled sewage source heat pump integrated energy supply system is switched under different working 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, and 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 operates 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 heat storage water pump, inter-seasonal heat 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 use the heat stored in the cold and heat storage device for peak heating. Summer cooling mode: In this working mode, 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 closed; the inter-seasonal heat storage heating water pump, the inter-seasonal heat storage heating return pump, and the energy storage water supply pump are closed, and other equipment operates normally to provide cooling for cold users; Summer cooling mode: In this working mode, electric valve a, electric valve d, electric valve p, electric valve q, electric valve h, and electric valve k are closed; the inter-seasonal heat storage hot water pump, the inter-seasonal heat storage heating return 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 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 and the inter-seasonal heat storage heating return water pump are closed, and other equipment operates normally to provide cooling for cold users, and at the same time, the cold storage capacity of 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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