A circulating heating system using new well and surface waste well for storing heat in off-season

Abstract

The application provides a circulating heating system for anti-season heat storage by using newly-built wells and surface waste wells, comprising a heat storage circulating system and a heating circulating system. The heat storage circulating system comprises a first heat source supply circuit and a water source heat storage circuit, and the water source heat storage circuit is used for storing the low-temperature water of a surface water source or a low-temperature injection-production well in a high-temperature injection-production well after heat exchange with the heat source of the first heat source supply circuit in a non-heating period; the heating circulating system comprises a second heat source supply circuit and a water source heating circuit, and the second heat source supply circuit is used for back-filling the high-temperature water in the high-temperature injection-production well to the low-temperature injection-production well after heat exchange with the heating circulating water in a heating period. The high-temperature injection-production well and the low-temperature injection-production well are newly-built wells and existing surface waste wells, and the surface waste wells comprise oil abandoned wells, long-stopped wells, geothermal abandoned wells, water extraction abandoned wells, exploration abandoned wells and observation abandoned wells, and have the advantages of repairing and reusing waste, small energy loss, low operation cost, zero emission and stability and reliability.

Description

Technical Field

[0001] This invention relates to the field of heating system technology, and in particular to a circulating heating system that utilizes newly built wells and abandoned surface wells for off-season heat storage. Background Technology

[0002] Heating is a basic necessity for people in northern regions during winter. In recent years, with the approaching dual-carbon goals, the heating industry faces a major challenge in energy structure transformation, with clean and low-carbon development being the main themes for the future. Currently, the domestic natural gas supply is insufficient, leading to a severe shortage of heating energy in many areas. The development and utilization of renewable energy sources such as electricity, nuclear power, solar energy, and geothermal energy will become the main technological approaches for heating. However, the seasonal fluctuations and instability of renewable energy are unavoidable in its utilization. With the promotion and popularization of renewable energy sources such as wind power and solar power, two major contradictions are becoming increasingly prominent: first, the contradiction between the instability of renewable energy supply and the stability of demand; and second, the mismatch between the seasonal distribution of solar energy and the seasonal distribution of energy consumption demand. Using solar energy for heating results in less solar energy resources in winter and a surplus in summer, while energy demand is the opposite, with heating demand being higher in winter. Therefore, this mismatch requires an energy storage method, namely energy storage, to solve the problem. Cross-seasonal heat storage is a key technology for resolving these two major contradictions.

[0003] Currently, the world's leading cross-seasonal thermal storage technologies mainly include steel tanks, large-capacity water tanks, soil-source thermal storage, groundwater thermal storage, and large-scale phase change energy storage. Geothermal heating is also a commonly used heating method, primarily using geothermal energy as the main heat source. Geothermal energy is an energy source inherent in the Earth itself and is considered a renewable energy source. In China, especially in northern regions, there is a 40-50 year history of geothermal energy extraction. However, due to over-exploitation, extraction exceeds irrigation, resulting in a significant drop in geothermal water levels. Many old wells are no longer usable and are nearing the end of their lifespan. Furthermore, because surface wells were built a long time ago and are numerous, these depleted wells have been idle for a long time, causing serious waste and safety hazards. Therefore, to solve the problems of winter heating and the shortage of non-renewable energy, there is an urgent need for a mature energy storage technology for summer heat and winter use, as well as a complete and rigorous system to solve the challenges of collecting, storing, and utilizing clean energy. Summary of the Invention

[0004] The purpose of this invention is to provide a circulating heating system that utilizes newly built wells and abandoned surface wells for off-season heat storage, thereby solving the technical problem in existing cross-seasonal heat storage systems that cannot utilize existing abandoned surface wells for off-season heat storage. The various technical effects of the preferred solutions among the many technical solutions provided by this invention are detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a circulating heating system for off-season heat storage using newly built wells and abandoned surface wells, comprising a heat storage circulation system and a heating circulation system, wherein...

[0007] The heat storage circulation system includes a first heat source supply circuit and a water source heat storage circuit. The first heat source supply circuit is used to exchange heat between the surface heat source and the low-temperature water in the water source heat storage circuit during the non-heating period. The water source heat storage circuit is used to exchange heat between the surface water source or the low-temperature water from the low-temperature irrigation well and the heat source of the first heat source supply circuit during the non-heating period, and then store the heat-exchanged high-temperature water in the high-temperature storage well.

[0008] The heating circulation system includes a second heat source supply circuit and a water source heating circuit. The second heat source supply circuit is used to exchange heat between the high-temperature water in the high-temperature storage and extraction well and the heating circulation water in the water source heating circuit during the heating period, and then reinject the heat-exchanged low-temperature water back into the low-temperature injection and extraction well. The water source heating circuit is used to provide a heat source for the heating station after exchanging heat between the heating circulation water and the high-temperature water in the second heat source supply circuit during the heating period.

[0009] According to a preferred embodiment, the first heat source supply circuit includes a surface heat source, a surface high-temperature heating pipeline, a heat exchanger, and a surface high-temperature regeneration pipeline. One end of the surface high-temperature heating pipeline is connected to the outlet of the surface heat source, and the other end is connected to the heat inlet of the heat exchanger. One end of the surface high-temperature regeneration pipeline is connected to the cold outlet of the heat exchanger, and the other end is connected to the inlet of the surface heat source.

[0010] According to a preferred embodiment, a first valve, a first temperature detection device, a first pressure detection device, a first flow detection device, a second valve, and a third valve are sequentially arranged along the heat source flow direction on the surface high-temperature heating pipeline, and the first valve is located near the outlet of the surface heat source, while the second valve and the third valve are located near the heat inlet of the heat exchanger.

[0011] A fourth valve, a fifth valve, and a sixth valve are sequentially installed on the surface high-temperature regeneration pipeline. The fourth valve is located near the cold outlet of the heat exchanger, and the sixth valve is located near the inlet of the surface heat source (1).

[0012] According to a preferred embodiment, the water source heat storage circuit includes a first low-temperature water source heat storage circuit and a second low-temperature water source heat storage circuit, wherein,

[0013] The first low-temperature water source heat storage circuit includes a surface water source, a surface low-temperature water supply pipeline, a heat exchanger, a high-temperature reinjection hot water storage pipeline, and a high-temperature storage and extraction well. One end of the surface low-temperature water supply pipeline is connected to the outlet of the surface water source, and the other end is connected to the cold inlet of the heat exchanger. One end of the high-temperature reinjection hot water storage pipeline is connected to the hot outlet of the heat exchanger, and the other end is connected to the high-temperature storage and extraction well.

[0014] The second low-temperature water source heat storage circuit includes a low-temperature injection and extraction well, a low-temperature water supply pipeline, a heat exchanger, a high-temperature reinjection and heat storage pipeline, and a high-temperature heat storage and extraction well. One end of the low-temperature water supply pipeline is connected to the outlet of the low-temperature injection and extraction well, and the other end is connected to the surface low-temperature water supply pipeline to be connected to the cold inlet of the heat exchanger.

[0015] According to a preferred embodiment, the surface low-temperature water supply pipeline is provided with a seventh valve, a second flow detection device, a second pressure detection device, a second temperature detection device, an eighth valve, and a ninth valve in sequence along the water flow direction. The seventh valve is located near the outlet of the surface water source, and the eighth and ninth valves are located near the cold inlet of the heat exchanger.

[0016] The low-temperature water supply pipeline is provided with a tenth valve, an eleventh valve and a ninth valve in sequence along the water flow direction. The tenth valve is located near the outlet of the low-temperature irrigation and extraction well, and the eleventh valve is located near the connection between the low-temperature water supply pipeline and the surface low-temperature water supply pipeline.

[0017] The high-temperature reinjection hot water storage pipeline is equipped with a twelfth valve, a thirteenth valve, a fourteenth valve, a first and third stage filter, a third flow detection device, a third pressure detection device, and a third temperature detection device in sequence along the water flow direction.

[0018] According to a preferred embodiment, the second heat source supply circuit includes a high-temperature storage and extraction well, a high-temperature heat storage water supply pipeline, a heat exchanger, a low-temperature heat storage return water pipeline, and a low-temperature injection and extraction well. One end of the high-temperature heat storage water supply pipeline is connected to the high-temperature storage and extraction well, and the other end is connected to the heat inlet of the heat exchanger. One end of the low-temperature heat storage return water pipeline is connected to the cold outlet of the heat exchanger, and the other end is connected to the low-temperature injection and extraction well.

[0019] The thermal storage high-temperature water supply pipeline is provided with a fifteenth valve, a sixteenth valve and a third valve in sequence along the water flow direction, with the fifteenth valve located near the outlet of the high-temperature storage well and the sixteenth valve located near the connection between the thermal storage high-temperature water supply pipeline and the surface high-temperature heating pipeline.

[0020] The thermal storage low-temperature return water pipeline is equipped with a fourth valve, a seventeenth valve, an eighteenth valve, a second and third stage filter, a fourth flow detection device, a fourth temperature detection device, and a fourth pressure detection device in sequence along the water flow direction.

[0021] According to a preferred embodiment, the water source heating circuit includes a heating station, a low-temperature circulating water pipeline, a heat exchanger, and a high-temperature circulating water pipeline.

[0022] Wherein, one end of the low-temperature circulating water pipe for heating is connected to the outlet of the heating station, and the other end is connected to the cold inlet of the heat exchanger; one end of the high-temperature circulating water pipe for heating is connected to the hot outlet of the heat exchanger, and the other end is connected to the inlet of the heating station.

[0023] The heating low-temperature circulating water pipeline is provided with a fifth temperature detection device, a fifth pressure detection device, a fifth flow detection device, a nineteenth valve, an eighth valve, and a ninth valve in sequence along the water flow direction. The heating high-temperature circulating water pipeline is provided with a twelfth valve, a twentieth valve, and a twenty-first valve in sequence along the water flow direction.

[0024] According to a preferred embodiment, the system further includes a water replenishment tank, which is connected to a surface low-temperature water supply pipeline via a first inlet pipe. The water replenishment tank is connected to a heating low-temperature circulating water pipeline and a surface low-temperature water supply pipeline via a first outlet pipe and a second outlet pipe, respectively. A twenty-second valve is provided on the first inlet pipe, a twenty-third valve is provided on the first outlet pipe, and a twenty-fourth valve is provided on the second outlet pipe.

[0025] According to a preferred embodiment, a first submersible pump and a first water level detection pipe are provided in the high-temperature storage and extraction well, and a second submersible pump and a second water level detection pipe are provided in the low-temperature injection and extraction well.

[0026] According to a preferred embodiment, the high-temperature storage well and the low-temperature injection well are newly built wells and existing abandoned surface wells, respectively. The newly built wells are formed in Neogene sandstone and conglomerate strata, and the newly built wells and the existing abandoned surface wells have perforations in Neogene sandstone and conglomerate strata.

[0027] Based on the above technical solution, the circulating heating system of the present invention, which utilizes newly built wells and abandoned surface wells for off-season heat storage, has at least the following technical effects:

[0028] This invention provides a circulating heating system for off-season heat storage using newly built wells and abandoned surface wells, comprising a heat storage circulation system and a heating circulation system. The heat storage circulation system includes a first heat source supply loop and a water source heat storage loop. The first heat source supply loop is used to exchange heat between the surface heat source and the low-temperature water in the water source heat storage loop during the non-heating period. The water source heat storage loop is used to exchange heat between the low-temperature water from the surface water source or the low-temperature injection well and the heat source of the first heat source supply loop during the non-heating period, and then store the heat-exchanged high-temperature water in the high-temperature injection well. The heating circulation system includes a second heat source supply loop and a water source heating loop. The second heat source supply loop is used to exchange heat between the high-temperature water in the high-temperature injection well and the heating circulation water in the water source heating loop during the heating period, and then reinject the heat-exchanged low-temperature water back into the low-temperature injection well. The water source heating loop is used to exchange heat between the heating circulation water and the high-temperature water in the second heat source supply loop during the heating period, and then provide a heat source for the heating station.

[0029] This application uses high-temperature storage wells and low-temperature injection wells as paired wells. These wells can utilize newly built wells or already mined abandoned surface wells. It combines off-season heat storage with surface well construction and the reuse of abandoned surface wells. During the non-heating season, a heat storage circulation system recycles low-temperature surface water through a surface heat source and reinjects it into the high-temperature storage well. During the heating season, a heating circulation system uses the hot water stored in the high-temperature storage well to supply heating to the heating station, while the recycled low-temperature water is injected into the low-temperature injection well. In the next non-heating season, low-temperature water is extracted from the low-temperature injection well, recycles through a heat exchanger, and then injected into the high-temperature storage well for energy storage, forming a two-way, repetitive closed-loop circulation system. This invention's circulating heating system prioritizes the use of already mined abandoned surface wells. Where abandoned surface wells are unavailable, newly built wells can be used. This circulating heating system offers advantages such as repairing and utilizing existing wells, low energy loss, low operating costs, zero emissions, and stable reliability, resulting in significant economic and environmental benefits. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the circulating heating system of the present invention, which utilizes newly built wells and abandoned surface wells for off-season heat storage.

[0032] In the diagram: 1-Surface heat source; 2-First valve; 3-First temperature detection device; 4-First pressure detection device; 5-First flow detection device; 6-Second valve; 7-Third valve; 8-Sixteenth valve; 9-Heat exchanger; 10-Fourth valve; 11-Seventeenth valve; 12-Fifth valve; 13-Sixth valve; 14-Fifteenth valve; 15-First submersible pump; 16-First water level detection pipe; 17-Second water level detection pipe; 18-Second submersible pump; 19-Third temperature detection device; 20-Third pressure detection device; 21-Third flow detection device; 22-5-micron fine filter; 23-10-micron filter; 24-Sand separator; 25-Fourteenth valve; 26-Eighteenth valve; 30-Fourth flow detection device; 31- 32-Fourth pressure detection device; 33-Fourth temperature detection device; 34-Tenth valve; 35-Twentieth valve; 36-Twelfth valve; 37-Thirteenth valve; 38-Ninth valve; 39-Eighth valve; 40-Eleventh valve; 41-Forty-eighth valve; 42-Fifth pressure detection device; 43-Fifth temperature detection device; 44-Fifth flow detection device; 45-Nineteenth valve; 46-Twenty-third valve; 47-Twenty-fourth valve; 48-Twenty-second valve; 49-Make-up tank; 50-Second temperature detection device; 51-Second pressure detection device; 52-Second flow detection device; 53-Seventh valve; 54-Surface water source; 55-Heating station; 56-High-temperature storage and extraction well; 57-Low-temperature irrigation and extraction well. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0034] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings.

[0035] This invention provides a circulating heating system for off-season heat storage using newly built wells and abandoned surface wells, comprising a heat storage circulation system and a heating circulation system. The heat storage circulation system includes a first heat source supply loop and a water source heat storage loop. The first heat source supply loop is used to exchange heat between the surface heat source 1 and the low-temperature water in the water source heat storage loop during the non-heating period. The water source heat storage loop is used to exchange heat between the low-temperature water from the surface water source 54 or the low-temperature injection well 57 and the heat source of the first heat source supply loop during the non-heating period, and then store the heat-exchanged high-temperature water in the high-temperature storage well 56. Thus, during the summer non-heating period, heat can be exchanged between the surface heat source and the low-temperature water in the surface water source or the low-temperature injection well, and the heat-exchanged hot water can be reinjected into the high-temperature storage well for energy storage.

[0036] The heating circulation system includes a second heat source supply loop and a water source heating loop. During the heating season, the second heat source supply loop allows the high-temperature water in the high-temperature storage well 56 to exchange heat with the circulating water in the water source heating loop, and then the cooled water is reinjected into the low-temperature injection well 57. The water source heating loop provides a heat source for the heating station 55 by exchanging heat between the circulating water and the high-temperature water in the second heat source supply loop during the heating season. During the winter heating season, the heat energy stored in the high-temperature storage well is used to exchange heat with the circulating water, achieving the purpose of cross-seasonal heat storage heating. This invention uses high-temperature storage wells and low-temperature injection wells as paired wells. These wells can be newly built or already mined abandoned surface wells, with priority given to already mined abandoned surface wells. In the absence of abandoned surface wells, newly built wells can be used. This invention combines off-season heat storage with surface well construction and the reuse of abandoned surface wells. During the non-heating season, a heat storage circulation system recycles low-temperature surface water through a surface heat source and reinjects it into the high-temperature storage well. During the heating season, a heating circulation system uses the hot water stored in the high-temperature storage well to supply heat to the heating station, while the recycled low-temperature water is injected into the low-temperature injection well. In the next non-heating season, low-temperature water is extracted from the low-temperature injection well, recycles through a heat exchanger, and then injected into the high-temperature storage well for energy storage, forming a bidirectional, repetitive closed-loop circulation system.

[0037] More preferably, the high-temperature storage well 56 and the low-temperature injection well 57 are newly built wells and existing abandoned surface wells, respectively. The newly built wells are constructed in Neogene sandstone and conglomerate strata, and the existing abandoned surface wells include abandoned oil wells, long-term shut-in wells, abandoned geothermal wells, abandoned water intake wells, abandoned exploration wells, and abandoned observation wells. Both the newly built wells and the existing abandoned surface wells have perforations in the Neogene sandstone and conglomerate strata. This fully utilizes the good insulation and low heat loss characteristics of the Neogene sandstone and conglomerate aquifer as a storage reservoir. Combined with the circulating heating system of this application, the purpose of energy storage and circulating heating for summer storage and winter use is achieved.

[0038] like Figure 1As shown, the first heat source supply circuit includes a surface heat source 1, a surface high-temperature heating pipeline, a heat exchanger 9, and a surface high-temperature regeneration pipeline. One end of the surface high-temperature heating pipeline is connected to the outlet of the surface heat source 1, and the other end is connected to the heat inlet of the heat exchanger 9; one end of the surface high-temperature regeneration pipeline is connected to the cold outlet of the heat exchanger 9, and the other end is connected to the inlet of the surface heat source 1. Preferably, the surface heat source is widely available. The surface heat source 1 can be clean surface energy sources such as power plant heat, wind energy, solar energy, and industrial waste heat. It is characterized by shortages in winter and severe surpluses in summer. Therefore, during the non-heating season, the surface heat source can be fully utilized for off-season heat storage. Preferably, as... Figure 1 As shown, along the heat source flow direction, the surface high-temperature heating pipeline is sequentially equipped with a first valve 2, a first temperature detection device 3, a first pressure detection device 4, a first flow detection device 5, a second valve 6, and a third valve 7. The first valve 2 is located near the outlet of the surface heat source 1, and the second valve 6 and the third valve 7 are located near the heat inlet of the heat exchanger 9. The surface high-temperature regenerative pipeline is sequentially equipped with a fourth valve 10, a fifth valve 12, and a sixth valve 13. The fourth valve 10 is located near the cold outlet of the heat exchanger 9, and the sixth valve 13 is located near the inlet of the surface heat source 1. During the non-heating season, the first heat source supply circuit is in operation, and the first valve 2, the first temperature detection device 3, the first pressure detection device 4, the first flow detection device 5, the second valve 6, the third valve 7, the heat exchanger 9, the fourth valve 10, the fifth valve 12, and the sixth valve 13 are in the open state. This allows the heat source of the surface heat source 1 to enter the heat exchanger through the heat inlet of the heat exchanger via the surface heat source high-temperature heating pipeline, exchange heat, and then be discharged from the cold outlet of the heat exchanger and returned to the surface heat source 1 via the surface high-temperature return pipeline, forming a cycle.

[0039] like Figure 1 As shown, the water source thermal storage circuit includes a first low-temperature water source thermal storage circuit and a second low-temperature water source thermal storage circuit. The first low-temperature water source thermal storage circuit includes a surface water source 54, a surface low-temperature water supply pipeline, a heat exchanger 9, a high-temperature reinjection hot water storage pipeline, and a high-temperature storage and extraction well 56. One end of the surface low-temperature water supply pipeline is connected to the outlet of the surface water source 54, and the other end is connected to the cold inlet of the heat exchanger 9. One end of the high-temperature reinjection hot water storage pipeline is connected to the hot outlet of the heat exchanger 9, and the other end is connected to the high-temperature storage and extraction well 56. Figure 1As shown, the surface low-temperature water supply pipeline is equipped with a seventh valve 53, a second flow detection device 52, a second pressure detection device 51, a second temperature detection device 50, an eighth valve 39, and a ninth valve 38 sequentially along the water flow direction. The seventh valve 53 is located near the outlet of the surface water source 54, while the eighth valve 39 and the ninth valve 38 are located near the cold inlet of the heat exchanger 9. The high-temperature reinjection hot water storage pipeline is equipped with a twelfth valve 36, a thirteenth valve 37, a fourteenth valve 25, a first-stage filter, a third flow detection device 21, a third pressure detection device 20, and a third temperature detection device 19 sequentially along the water flow direction. The first low-temperature water source heat storage circuit is used to exchange heat between the surface water source and the surface heat source in the heat exchanger 9 during the non-heating period. Preferably, the surface water source is widely available. The surface water source 54 includes natural surface water such as rivers, lakes, and seas, collected rainwater, and treated greywater, which can be optimally selected according to local conditions. During the non-heating season, while the first heat source supply circuit is in operation, the first low-temperature water source heat storage circuit is also in operation. The seventh valve 53, the second flow detection device 52, the second pressure detection device 51, the second temperature detection device 50, the eighth valve 39, the ninth valve 38, the twelfth valve 36, the thirteenth valve 37, the fourteenth valve 25, the first and third stage filters, the third flow detection device 21, the third pressure detection device 20, and the third temperature detection device 19 are all open. This allows the low-temperature water from the surface water source to enter the heat exchanger 9 through the cold inlet, exchange heat with the surface heat source, and then exit from the heat outlet of the heat exchanger into the high-temperature storage well for heat storage. Preferably, the first and third stage filters include a first-stage desander 24, a second-stage 10-micron filter 23, and a third-stage 5-micron fine filter 22. These filters are used to filter the high-temperature water entering the high-temperature storage well 56 after heat exchange.

[0040] Furthermore, such as Figure 1 As shown, the second heat source supply circuit includes a high-temperature storage and extraction well 56, a high-temperature heat storage water supply pipeline, a heat exchanger 9, a low-temperature heat storage return water pipeline, and a low-temperature injection and extraction well 57. One end of the high-temperature heat storage water supply pipeline is connected to the high-temperature storage and extraction well 56, and the other end is connected to the heat inlet of the heat exchanger 9. One end of the low-temperature heat storage return water pipeline is connected to the cold outlet of the heat exchanger 9, and the other end is connected to the low-temperature injection and extraction well 57. Figure 1As shown, the thermal storage high-temperature water supply pipeline is equipped with a fifteenth valve 14, a sixteenth valve 8, and a third valve 7 sequentially along the water flow direction. The fifteenth valve 14 is located near the outlet of the high-temperature storage well 56, and the sixteenth valve 8 is located near the connection between the thermal storage high-temperature water supply pipeline and the surface high-temperature heating pipeline. The connection between the thermal storage high-temperature water supply pipeline and the surface high-temperature heating pipeline is located between the second valve 6 and the third valve 7. The thermal storage low-temperature return water pipeline is equipped with a fourth valve 10, a seventeenth valve 11, an eighteenth valve 26, a second and third stage filter, a fourth flow detection device 30, a fourth temperature detection device 32, and a fourth pressure detection device 31 sequentially along the water flow direction. The seventeenth valve 11 is located near the connection between the thermal storage low-temperature return water pipeline and the surface high-temperature return water pipeline, which is located between the fourth valve 10 and the seventeenth valve 11. During the heating season, the second heat source supply circuit is in operation. Valve 14 (15th stage), valve 8 (16th stage), valve 7 (3rd stage), heat exchanger 9, valve 10 (4th stage), valve 11 (17th stage), valve 26 (18th stage), second and third stage filters, fourth flow detection device 30, fourth temperature detection device 32, and fourth pressure detection device 31 are all open. A first submersible pump 15 and a first water level detection pipe 16 are installed in the high-temperature storage well 56. During the heating season, the first submersible pump 15 extracts the high-temperature stored water from the high-temperature storage well 56, which enters the heat inlet of the heat exchanger 9 for heat exchange and is then discharged from the cold outlet of the heat exchanger 9 and reinjected into the low-temperature irrigation well 57 via the low-temperature return water pipeline. Preferably, the second and third stage filters include a first-stage desander 24, a second-stage 10-micron filter 23, and a third-stage 5-micron fine filter 22, to filter the low-temperature water entering the low-temperature irrigation well 57 after heat exchange. The first water level detection pipe 16 is used to monitor the water level of the high-temperature storage and extraction well, and to monitor the quantity, quality, and various dynamic parameters of reinjection and extraction within the well. It not only collects necessary dynamic data but also monitors the system's operating status in a timely manner, ensuring normal system operation. The first submersible pump 15 is connected to the wellhead via a seamless steel well pipe and is connected to the surface power supply via a waterproof cable. The first submersible pump is preferably a multi-stage high-temperature submersible pump with a head ≥160 meters. The high-temperature submersible pump uses frequency converter control, adjusting the frequency converter frequency according to the real-time dynamic pressure at the pump outlet to better meet operational requirements.

[0041] Preferably, such as Figure 1As shown, the water source heating circuit includes a heating station 55, a low-temperature circulating water pipeline, a heat exchanger 9, and a high-temperature circulating water pipeline. The heating station 55 is the end user of this system and serves as the primary heating station (heat source station) for centralized heating. The circulating water undergoes a closed-loop circulation through the heat exchanger without backfilling. The heating station can utilize equipment such as gas-fired heat pumps, gas-fired boilers, and point heat pumps to increase heating capacity and heat utilization rate. One end of the low-temperature circulating water pipeline is connected to the outlet of the heating station 55, and the other end is connected to the cold inlet of the heat exchanger 9. One end of the high-temperature circulating water pipeline is connected to the hot outlet of the heat exchanger 9, and the other end is connected to the inlet of the heating station 55. Along the water flow direction, the low-temperature circulating water pipeline is equipped with a forty-eighth valve 41, a fifth temperature detection device 43, a fifth pressure detection device 42, a fifth flow detection device 44, a nineteenth valve 45, an eighth valve 39, and a ninth valve 38. Along the water flow direction, the high-temperature circulating water pipeline for heating is equipped with the twelfth valve 36, the twentieth valve 35, and the twenty-first valve 34. During the heating season, the water source heating circuit is in operation, and the forty-eighth valve 41, the fifth temperature detection device 43, the fifth pressure detection device 42, the fifth flow detection device 44, the nineteenth valve 45, the eighth valve 39, the ninth valve 38, the twelfth valve 36, the twentieth valve 35, and the twenty-first valve 34 are in the open state. This allows the low-temperature circulating water for heating to exchange heat with the high-temperature water in the heat exchanger and the second heat source supply circuit, thereby providing a heat source for the heating station.

[0042] Furthermore, the second low-temperature water source thermal storage circuit of the water source thermal storage circuit includes a low-temperature injection / extraction well 57, a low-temperature water supply pipeline, a heat exchanger 9, a high-temperature reinjection hot water storage pipeline, and a high-temperature storage / extraction well 56. One end of the low-temperature water supply pipeline is connected to the outlet of the low-temperature injection / extraction well 57, and the other end is connected to the surface low-temperature water supply pipeline to connect to the cold inlet of the heat exchanger 9. (Reference) Figure 1The low-temperature water supply pipeline is equipped with a tenth valve 33, an eleventh valve 40, and a ninth valve 38 sequentially along the water flow direction. The tenth valve 33 is located near the outlet of the low-temperature irrigation and extraction well 57, and the eleventh valve 40 is located near the connection between the low-temperature water supply pipeline and the surface low-temperature water supply pipeline. The second low-temperature water source heat storage circuit shares a high-temperature reinjection heat storage pipeline with the first low-temperature water source heat storage circuit. The second low-temperature water source heat storage circuit is designed to operate during the next non-heating season. During the next non-heating season, the second low-temperature water source heat storage circuit is also operating simultaneously with the first heat source supply circuit. At this time, the tenth valve 33, the eleventh valve 40, the ninth valve 38, the twelfth valve 36, the thirteenth valve 37, the fourteenth valve 25, the first and third stage filters, the third flow detection device 21, the third pressure detection device 20, and the third temperature detection device 19 are all in the open state. A second submersible pump 18 and a second water level detection pipe 17 are installed inside the low-temperature irrigation and extraction well 57. The second submersible pump 18 extracts the low-temperature water from the low-temperature injection-extraction well, allowing it to pass through the cold inlet of heat exchanger 9 and exchange heat with the surface heat source. Afterward, the water exits from the hot outlet of the heat exchanger and enters the high-temperature storage-extraction well for heat storage, circulating repeatedly. The second water level detection pipe 17 is used to monitor the water level of the low-temperature injection-extraction well, monitoring the quantity, quality, and various dynamic parameters of reinjection and extraction within the well. It not only collects necessary dynamic data but also monitors the system's operating status in a timely manner, ensuring normal system operation. The second submersible pump 18 is connected to the wellhead via a seamless steel well pipe and is connected to the surface power supply via a waterproof cable. The second submersible pump is preferably a multi-stage high-temperature submersible pump with a head ≥160 meters. The high-temperature submersible pump uses frequency converter control, adjusting the frequency converter frequency according to the real-time dynamic pressure at the pump outlet to better meet operational requirements.

[0043] More preferably, the circulating heating system of this application further includes a water replenishment tank 49. The water replenishment tank 49 is connected to the surface low-temperature water supply pipeline through a first inlet pipe, and a twenty-second valve 48 is provided on the first inlet pipe. Opening the twenty-second valve 48 allows water to be injected into the water replenishment tank 49 through the surface water source. The water replenishment tank 49 is connected to the heating low-temperature circulating water pipeline and the surface low-temperature water supply pipeline through a first outlet pipe and a second outlet pipe, respectively. A twenty-third valve 46 is provided on the first outlet pipe, and a twenty-fourth valve 47 is provided on the second outlet pipe. Thus, when the twenty-third valve 46 or the twenty-fourth valve 47 is opened, water can be replenished into the heating low-temperature circulating water pipeline or the surface low-temperature water supply pipeline through the water replenishment tank. When the surface water source is short of water, the water replenishment tank can be used to replenish the surface low-temperature water supply pipeline, thereby reducing the number of pump starts and saving costs. At the same time, the water replenishment tank can ensure that the hot water reinjection volume is greater than the extraction volume, effectively alleviating the problem of hot water shortage.

[0044] Preferably, the heat exchanger 9 of this application is connected to the high-temperature storage well 56, the low-temperature injection well 57, the surface heat source 1, the surface water source 54, and the heating station 55 via pipelines, saving investment costs. The heat exchanger 9 is a plate heat exchanger, and a modular unit with titanium plate heat exchange can be adopted. Preferably, circulating water pumps are provided in the surface water source 54, the surface heat source 1, and the heating station 55. Preferably, automatic air vents are installed at the highest points of the first heat source supply circuit, the first low-temperature water source heat storage circuit, the second low-temperature water source heat storage circuit, the second heat source supply circuit, and the water source heating circuit to remove air entrained in the water in the system. Preferably, the first, second, third, fourth, and fifth pressure detection devices of this application are intelligent wireless pressure gauges. The first, second, third, fourth, and fifth flow detection devices of this application are electromagnetic flow meters. The first, second, third, fourth, and fifth temperature detection devices in this application are remote temperature gauges. Preferably, the valves in this application can be manual butterfly valves or electromagnetic automatic valves, and the electromagnetic automatic valves can be connected to sensors to achieve microcomputer control.

[0045] The first heat source supply circuit and the first low-temperature water source heat storage circuit of this invention operate during the non-heating season. They utilize surface heat sources to exchange heat with surface water through a plate heat exchanger and store the heat in the high-temperature storage well 56. Except for the valves in the first heat source supply circuit and the first low-temperature water source heat storage circuit, all other circuit valves are closed. The second heat source supply circuit and the water source heating circuit operate during the heating season. The first submersible pump 15 extracts high-temperature stored water from the high-temperature storage well, exchanges heat with the heating circulating water through the plate heat exchanger 9, and provides a heat source for the heating station. Simultaneously, the heat-exchanged low-temperature water is reinjected into the low-temperature injection well 57. Except for the valves in the second heat source supply circuit and the water source heating circuit, all other circuit valves are closed. During the heating season, surface heat source heating is not required, alleviating the winter heating shortage. The first heat source supply circuit and the second low-temperature water source heat storage circuit operate during the next non-heating season. The second submersible pump 18 extracts the reinjection water from the low-temperature injection well 57, and after heat exchange through a plate heat exchanger via a surface heat source, the low-temperature reinjection water is stored in the high-temperature heat storage well 56. Except for the valves in the first heat source supply circuit and the second low-temperature water source heat storage circuit, all other circuit valves are closed. In this invention, the reinjection hot water temperature is ≥60℃, the reinjection cold water temperature is ≥9℃, and the heat utilization efficiency is high.

[0046] This invention's circulating heating system solves both the problem of heat storage in summer and the problem of storing clean energy sources such as wind and solar power, while also increasing heating capacity in winter, achieving energy conservation and emission reduction. The surface wells used in this application are all perforated in Neogene sandstone and conglomerate strata, fully utilizing the good insulation and low heat loss characteristics of the Neogene sandstone and conglomerate aquifers as storage layers. Combined with the cross-seasonal thermal storage heating system of this application, the stored hot water is recycled between the non-heating season and the heating season through surface wells, water pumps, control valves, and other devices, achieving the purpose of summer storage and winter use for energy storage and circulating heating. This invention utilizes abandoned surface wells that cannot be further extracted or have insufficient production, representing resource reuse and saving significant well drilling costs. Furthermore, this invention utilizes surface water replenishment, ensuring that the hot water reinjection volume exceeds the extraction volume, effectively alleviating geothermal water shortages. This invention has advantages such as energy conservation and emission reduction, repair and reuse of old wells, off-season energy storage, alleviating resource shortages, alleviating energy waste, low investment, and quick results. It also exhibits good reliability and stability, demonstrating significant economic and social benefits.

[0047] In this invention, the depth, water temperature, and water volume of the Neogene sandstone and conglomerate strata are important indicators for evaluating the utilization value and risk assessment of these strata. Selecting suitable strata as the basis for constructing the cross-seasonal heat storage circulating heating system based on confined aquifers provided by this invention can achieve higher economic benefits and reduce risks. Building upon existing technology, directional perforation is performed on newly constructed wells and abandoned surface wells in the target strata to increase reinjection storage capacity. The number of perforations directly affects the stability and risk level of the off-season heat storage circulating heating system provided by this invention.

[0048] The circulating heating system provided by this invention, which utilizes newly built wells and abandoned surface wells for off-season heat storage, has significant energy-saving and emission-reduction effects. For example, if a pair of wells heats 120T / h of surface water from 10℃ to 60℃ using surface heat sources, the hourly water production of 60℃ hot water is:

[0049] cm△t=4.2*10 3 *50*1000*120=2.52*10^10J / h;

[0050] Based on a non-heating season of 150 days, the heat that can be stored is:

[0051] 2.52*10^10J / h*24*150=9072*10^10J.

[0052] Based on the power plant heat price of 36 GJ, the annual output value is:

[0053] 9072*10^10J÷10^9*36=3.266 million yuan.

[0054] The circulating heating system provided by this invention has a good effect on reducing the emission of various pollutants. The heat storage capacity of 9072 * 10^10 J is equivalent to 9072 * 10^10 * 0.034 ÷ 10^9 = 3084.48 tons of standard coal. This can reduce emissions of carbon dioxide by 8081.34 tons, sulfur dioxide by 26.22 tons, and nitrogen oxides by 22.83 tons.

[0055] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A circulating heating system for utilizing a newly built well and a surface abandoned well for anti-season heat storage, characterized in that, The system comprises a heat storage cycle system and a heating cycle system, wherein, the heat storage cycle system comprises a first heat source supply circuit and a water source heat storage circuit, the first heat source supply circuit is used for heat exchange between a ground heat source (1) and low-temperature water in the water source heat storage circuit during a non-heating period, and the water source heat storage circuit is used for storing high-temperature water in a high-temperature storage and extraction well (56) after heat exchange between low-temperature water of a ground water source (54) or a low-temperature injection and extraction well (57) and a heat source of the first heat source supply circuit during the non-heating period; the heating cycle system comprises a second heat source supply circuit and a water source heating circuit, the second heat source supply circuit is used for heat exchange between high-temperature water in the high-temperature storage and extraction well (56) and heating cycle water in the water source heating circuit during a heating period, and the water source heating circuit is used for providing a heat source for a heating station (55) after heat exchange between the heating cycle water and the high-temperature water in the second heat source supply circuit during the heating period; the first heat source supply circuit comprises the ground heat source (1), a ground high-temperature heating pipeline, a heat exchanger (9) and a ground high-temperature heat recovery pipeline, one end of the ground high-temperature heating pipeline is connected to an outlet of the ground heat source (1), and the other end is connected to a hot inlet of the heat exchanger (9); one end of the ground high-temperature heat recovery pipeline is connected to a cold outlet of the heat exchanger (9), and the other end is connected to an inlet of the ground heat source (1); a first valve (2), a first temperature detection device (3), a first pressure detection device (4), a first flow detection device (5), a second valve (6) and a third valve (7) are sequentially arranged on the ground high-temperature heating pipeline in the flow direction of the heat source, and the first valve (2) is arranged close to the outlet of the ground heat source (1), and the second valve (6) and the third valve (7) are arranged close to the hot inlet of the heat exchanger (9); a fourth valve (10), a fifth valve (12) and a sixth valve (13) are sequentially arranged on the ground high-temperature heat recovery pipeline, and the fourth valve (10) is arranged close to the cold outlet of the heat exchanger (9), and the sixth valve (13) is arranged close to the inlet of the ground heat source (1); the water source heat storage circuit comprises a first low-temperature water source heat storage circuit and a second low-temperature water source heat storage circuit, wherein, the first low-temperature water source heat storage circuit comprises the ground water source (54), a ground low-temperature water supply pipeline, the heat exchanger (9), a high-temperature recharging heat storage water pipeline and the high-temperature storage and extraction well (56), one end of the ground low-temperature water supply pipeline is connected to a water outlet of the ground water source (54), and the other end is connected to a cold inlet of the heat exchanger (9); one end of the high-temperature recharging heat storage water pipeline is connected to a hot outlet of the heat exchanger (9), and the other end is connected to the high-temperature storage and extraction well (56). The second low-temperature water source heat storage circuit comprises a low-temperature filling and pumping well (57), a low-temperature water supply pipeline, a heat exchanger (9), a high-temperature recharging heat storage water pipeline and a high-temperature filling and pumping well (56), one end of the low-temperature water supply pipeline is connected to a water outlet of the low-temperature filling and pumping well (57), the other end is connected to the surface low-temperature water supply pipeline to be connected to a cold inlet of the heat exchanger (9); The surface low-temperature water supply pipeline is sequentially provided with a seventh valve (53), a second flow detection device (52), a second pressure detection device (51), a second temperature detection device (50), an eighth valve (39) and a ninth valve (38) along the water flow direction, the seventh valve (53) is arranged close to a water outlet of the surface water source (54), and the eighth valve (39) and the ninth valve (38) are arranged close to a cold inlet of the heat exchanger (9); The low-temperature water supply pipeline is sequentially provided with a tenth valve (33), an eleventh valve (40) and a ninth valve (38) along the water flow direction, the tenth valve (33) is arranged close to a water outlet of the low-temperature filling and pumping well (57), and the eleventh valve (40) is arranged close to a connection position of the low-temperature water supply pipeline and the surface low-temperature water supply pipeline; The high-temperature recharging heat storage water pipeline is sequentially provided with a twelfth valve (36), a thirteenth valve (37), a fourteenth valve (25), a first three-stage filter, a third flow detection device (21), a third pressure detection device (20) and a third temperature detection device (19) along the water flow direction; The second heat source supply circuit comprises a high-temperature filling and pumping well (56), a heat storage high-temperature water supply pipeline, a heat exchanger (9), a heat storage low-temperature water return pipeline and a low-temperature filling and pumping well (57), one end of the heat storage high-temperature water supply pipeline is connected to the high-temperature filling and pumping well (56), the other end is connected to a hot inlet of the heat exchanger (9), one end of the heat storage low-temperature water return pipeline is connected to a cold outlet of the heat exchanger (9), and the other end is connected to the low-temperature filling and pumping well (57); The heat storage high-temperature water supply pipeline is sequentially provided with a fifteenth valve (14), a sixteenth valve (8) and a third valve (7) along the water flow direction, and the fifteenth valve (14) is arranged close to a water outlet of the high-temperature filling and pumping well (56), and the sixteenth valve (8) is arranged close to a connection position of the heat storage high-temperature water supply pipeline and the surface high-temperature heat supply pipeline; The heat storage low-temperature water return pipeline is sequentially provided with a fourth valve (10), a seventeenth valve (11), an eighteenth valve (26), a second three-stage filter, a fourth flow detection device (30), a fourth temperature detection device (32) and a fourth pressure detection device (31) along the water flow direction; The water source heating circuit comprises a heat supply station (55), a heat supply low-temperature circulating water pipeline, a heat exchanger (9) and a heat supply high-temperature circulating water pipeline, The one end of the low-temperature circulating water pipeline for heat supply is connected with the water outlet of the heat supply station (55), and the other end is connected to the cold inlet of the heat exchanger (9); one end of the high-temperature circulating water pipeline for heat supply is connected to the hot outlet of the heat exchanger (9), and the other end is connected to the water inlet of the heat supply station (55). The fifth temperature detection device (43), the fifth pressure detection device (42), the fifth flow detection device (44), the nineteenth valve (45), the eighth valve (39) and the ninth valve (38) are sequentially arranged on the low-temperature circulating water pipeline for heat supply along the water flow direction, and the twelfth valve (36), the twentieth valve (35) and the twenty-first valve (34) are sequentially arranged on the high-temperature circulating water pipeline for heat supply along the water flow direction.

2. The system for reverse-season heat accumulation and circulation according to claim 1, characterized in that, The water supplement tank (49) is connected with the surface low-temperature water supply pipeline through the first water inlet pipe, and the water supplement tank (49) is connected with the low-temperature circulating water pipeline for heat supply and the surface low-temperature water supply pipeline through the first water outlet pipe and the second water outlet pipe respectively, and the twenty-second valve (48) is arranged on the first water inlet pipe, the twenty-third valve (46) is arranged on the first water outlet pipe, and the twenty-fourth valve (47) is arranged on the second water outlet pipe.

3. The system for reverse-season heat accumulation and circulation according to claim 1, characterized in that, The first submersible pump (15) and the first water level detection pipe (16) are arranged in the high-temperature storage and recovery well (56), and the second submersible pump (18) and the second water level detection pipe (17) are arranged in the low-temperature filling and recovery well (57).

4. The system for reverse-season heat accumulation and circulation according to claim 1, wherein The high-temperature storage and recovery well (56) and the low-temperature filling and recovery well (57) are newly-built wells and existing surface abandoned wells, and the newly-built wells are completed in the newly-increased sand and gravel stratum, and the newly-built wells and the existing surface abandoned wells have perforations in the newly-increased sand and gravel stratum.

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