Solar energy and underground coal mine geothermal buried pipe combined multi-energy complementary coupling system

Abstract

The utility model provides a solar energy and underground coal mine geothermal buried pipe combined multi-energy complementary coupling system, which is characterized in that a heat collection water tank further comprises a water collection tank, and a water outlet of the water collection tank is communicated with a water inlet end of an evaporator in a heat pump unit through a second water pump; and the water outlet end of the evaporator is communicated with the water return port of the water collecting tank to form a closed water circulation heat supply loop. The system further comprises a plurality of buried pipes, one ends of the buried pipes are connected with the input end of a second water pump through a water collector, the output end of the second water pump communicates with the water inlet end of an evaporator in the heat pump unit, and the water outlet end of the evaporator communicates with the other ends of the buried pipes through a water distributor to form a closed water circulation heat supply loop. The heat supply continuity of the underground buried pipe ground source heat pump system of the mine is realized by relying on underground stable high-temperature surrounding rock bodies, utilizing the ground source heat pump technology, developing mine terrestrial heat, combining abundant solar energy resources in a coal mine area and compensating heat across seasons.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat pump systems, relates to a ground source heat pump system, and specifically relates to a multi-energy complementary coupling system combining solar energy with underground geothermal pipes in coal mines. Background Art

[0002] As shallow coal reserves are gradually depleted, coal resource development must continue to advance deeper into the Earth. Currently, the average mining depth is approaching 500 meters. As shallow resource extraction continues, mining depth is increasing at a rate of 10 to 25 meters per year. The geothermal gradient in most areas is 2 to 3°C per 100 meters. Based on this, it is estimated that surrounding rock temperatures can reach over 20°C at mining depths exceeding 500 meters. Therefore, deep mines hold vast geothermal resources.

[0003] The existing technology already has shallow ground source heat pump systems that use geothermal resources for heating. However, in western mining areas, the energy demand for heating is high in winter and difficult to recover in summer. The clean energy utilization rate of a single shallow ground source heat pump system is not very ideal. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a multi-energy complementary coupling system combining solar energy and underground geothermal buried pipes in coal mines, so as to solve the technical problem that the utilization rate of clean energy in mining areas in the existing technology needs to be further improved.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A multi-energy complementary coupling system combining solar energy and underground geothermal pipes in coal mines includes a solar water heating device. The water inlet end of the solar water heating device is connected to the water outlet end of a heating water tank in a heat collection tank through a first water pump. The water outlet end of the solar water heating device is connected to the return water end of the heating water tank to form a closed water circulation heating loop.

[0007] The heat collecting tank also includes a water collecting tank, the water outlet of the water collecting tank is connected to the water inlet of the evaporator in the heat pump unit through the second water pump, and the water outlet of the evaporator is connected to the return water port of the water collecting tank to form a closed water circulation heating loop.

[0008] It also includes multiple buried pipes, one end of which is connected to the input end of the second water pump through a water collector, the output end of the second water pump is connected to the water inlet end of the evaporator in the heat pump unit, and the water outlet end of the evaporator is connected to the other end of the multiple buried pipes through a water distributor to form a closed water circulation heating loop.

[0009] The utility model also has the following technical features:

[0010] The water inlet of the solar water heating equipment is connected to the output end of the water collector through the sixth water pump, and the input end of the water distributor is connected to the water outlet end of the solar water heating equipment to form a closed water circulation geothermal heat supply loop.

[0011] The water outlet of the condenser in the heat pump unit is connected to the high-temperature side water inlet of the plate heat exchanger, and the high-temperature side water outlet of the plate heat exchanger is connected to the return water end of the condenser through a third water pump to form a closed water circulation heating loop.

[0012] The low-temperature side water outlet of the plate heat exchanger is connected to the circulating water return end of the hot water storage tank, and the circulating water outlet of the hot water storage tank is connected to the low-temperature side water inlet end of the plate heat exchanger through the fourth water pump to form a closed water circulation heating loop.

[0013] The heat storage tank is connected to the domestic hot water tank through a seventh water pump to supply water; an electric heater is also installed in the domestic hot water tank.

[0014] The water outlet of the condenser is also connected to the water inlet of the user-side heater, and the water outlet of the user-side heater is connected to the return water end of the condenser through the fifth water pump to form a closed water circulation heating loop.

[0015] The water inlet end of the second water pump and the water inlet end of the fifth water pump are both connected to the water supply tank.

[0016] The structures of the water collector and the water distributor are the same; the water collector includes a main water pipe that can be connected to multiple buried pipes, the two ends of the main water pipe are closed, and the main water pipe is connected to an external water pipe; the main water pipe is also provided with a drain valve and an exhaust valve; the external water pipe is also provided with a digital balancing valve.

[0017] The solar water heating equipment adopts solar heat and power cogeneration solar panels; the buried pipe adopts a buried pipe equipped with rectangular spiral fins.

[0018] The water collecting tank and the heating water tank are connected via a water supply electric valve.

[0019] Compared with the prior art, the present invention has the following technical effects:

[0020] (I) The present invention combines solar energy with underground geothermal pipes in coal mines and utilizes solar energy cross-seasonal energy storage technology to overcome the problem of shallow ground source heat pump systems in western mining areas having high energy demand for heating in winter and difficulty in recovering in summer, thereby significantly improving the utilization rate of clean energy in mining areas.

[0021] (II) The present invention relies on the stable high-temperature surrounding rock mass underground and utilizes ground-source heat pump technology to develop mine geothermal energy. Combined with the abundant solar energy resources in the coal mining area, the utility model realizes the continuity of heating of the underground buried pipe ground-source heat pump system in the mine through cross-seasonal heat supplementation, providing a new direction for clean heating in mines in the northern cold regions in winter.

[0022] (III) The utility model utilizes the high temperature environment underground to lay buried pipes, thereby solving the problem of insufficient space for laying shallow buried pipes on the ground in mining areas, and can also indirectly improve the underground production environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of a multi-energy complementary coupling system combining solar energy and underground geothermal pipes in coal mines.

[0024] Figure 2 Schematic diagram of the water collector.

[0025] The meanings of the numbers in the figure are: 1-solar water heating equipment, 2-heat collection tank, 3-first water pump, 4-second water pump, 5-heat pump unit, 6-buried pipe, 7-water collector, 8-water distributor, 9-plate heat exchanger, 10-third water pump, 11-heat storage tank, 12-fourth water pump, 13-domestic hot water tank, 14-user-side heating, 15-fifth water pump, 16-sixth water pump, 17-electric heater, 18-seventh water pump, 19-pipeline, 20-valve, 21-water supply tank.

[0026] 201-heating water tank, 202-water collecting tank, 203-water supply electric valve.

[0027] 501-evaporator, 502-condenser.

[0028] 701- Main water pipe, 702- External water pipe, 703- Drain valve, 704- Exhaust valve, 705- Digital balancing valve.

[0029] The specific contents of the present invention are further explained in detail below with reference to the embodiments. DETAILED DESCRIPTION

[0030] It should be noted that, unless otherwise specified, all devices and components in the present invention are devices and components known in the prior art.

[0031] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the scope of protection of the present invention.

[0032] Example:

[0033] This embodiment provides a multi-energy complementary coupling system combining solar energy and underground geothermal pipes in coal mines. Figure 1 As shown, it includes a solar water heating device 1, the water inlet end of the solar water heating device 1 is connected to the water outlet end of the heating water tank 201 in the heat collection tank 2 through a first water pump 3, and the water outlet end of the solar water heating device 1 is connected to the return water end of the heating water tank 201 to form a closed water circulation heating loop.

[0034] like Figure 1 As shown, the heat collecting tank 2 also includes a water collecting tank 202, the water outlet of the water collecting tank 202 is connected to the water inlet end of the evaporator 501 in the heat pump unit 5 through the second water pump 4, and the water outlet end of the evaporator 501 is connected to the return water port of the water collecting tank 202 to form a closed water circulation heating loop.

[0035] like Figure 1 As shown, it also includes multiple buried pipes 6, one end of the multiple buried pipes 6 is connected to the input end of the second water pump 4 through the water collector 7, the output end of the second water pump 4 is connected to the water inlet end of the evaporator 501 in the heat pump unit 5, and the water outlet end of the evaporator 501 is connected to the other end of the multiple buried pipes 6 through the water distributor 8 to form a closed water circulation heating loop.

[0036] As a preferred solution of this embodiment, the solar water heating system 1 utilizes photovoltaic-thermal (PV / T) solar panels, which are commonly used in the art. In this embodiment, the CHP panels efficiently recycle heat from the panels, providing a high-quality, low-temperature heat source for the heat pump unit 5, improving thermal engine efficiency and achieving a coefficient of performance (COP) greater than 5.6, producing high-temperature, energy-storage hot water at temperatures above 55°C. This ensures that the CHP panels consistently operate within the optimal power generation temperature range, improving power generation efficiency and extending the life of the panel assembly.

[0037] In this embodiment, the buried pipe 6 is laid in a relatively stable high-temperature return air transportation tunnel underground, and the water collector 7 and the water distributor 8 are placed in the water tank at the bottom of the well.

[0038] As a preferred embodiment of this embodiment, the buried pipe 6 is equipped with rectangular spiral fins. These rectangular spiral fins are commonly used in the art. The inner wall of the buried pipe 6 is provided with multiple rectangular fins that extend spirally along the axial direction of the pipe. The fins, located on the same horizontal plane, are arranged at equal intervals along the circumferential direction. The spiral fin structure creates a rotational flow pattern, enhancing turbulence and improving the heat transfer coefficient between the inner wall of the buried pipe and the fluid.

[0039] As a preferred solution of this embodiment, Figure 1As shown, the water collecting tank 202 is connected to the heating water tank 201 through a water supply electric valve 203. After the water in the heating water tank 201 is heated to a set temperature by the solar water heating device 1, it is discharged into the water collecting tank 202 through the water supply valve 203.

[0040] As a specific solution of this embodiment, Figure 1 As shown, the condenser 502 obtains heat from the evaporator 501 through heat exchange. The condenser 502 in the heat pump unit 5 is connected to the high-temperature water inlet of the plate heat exchanger 9. The high-temperature water outlet of the plate heat exchanger 9 is connected to the return water end of the condenser 502 via the third water pump 10, forming a closed water circulation heating loop.

[0041] As a preferred solution of this embodiment, Figure 1 As shown, the low-temperature side water outlet end of the plate heat exchanger 9 is connected to the circulating water return end of the hot water storage tank 11, and the circulating water outlet end of the hot water storage tank 11 is connected to the low-temperature side water inlet end of the plate heat exchanger 9 through the fourth water pump 12 to form a closed water circulation heating loop.

[0042] As a preferred solution of this embodiment, Figure 1 As shown, the hot water storage tank 11 is connected to the domestic hot water tank 13 via a seventh water pump 18 to supply water.

[0043] As a preferred solution of this embodiment, Figure 1 As shown, an electric heater 17 is also installed in the domestic hot water tank 13. The electric heater 17 is used to supplement heating of domestic water in extreme weather conditions during the heating season.

[0044] As a preferred solution of this embodiment, Figure 1 As shown, the water outlet of condenser 502 is also connected to the water inlet of user-side heater 14. The water outlet of user-side heater 14 is connected to the return water of condenser 502 via fifth water pump 15, forming a closed water circulation heating loop. In this embodiment, heat pump unit 5 is used to provide heating to the user side of mining buildings.

[0045] As a preferred solution of this embodiment, Figure 2 As shown, the water collector 7 and water distributor 8 have the same structure. The water collector 7 includes a main water pipe 701 that can be connected to multiple buried pipes 6. The main water pipe 701 is sealed at both ends and connected to an external water pipe 702 for connecting to external pipelines. The main water pipe 701 is also equipped with a drain valve 703 and an exhaust valve 704. The external water pipe 702 is also equipped with a digital balancing valve 705.

[0046] As a preferred solution of this embodiment, the water inlet of the solar water heater 1 is connected to the output of the water collector 7 via the sixth water pump 16, and the input of the water distributor 8 is connected to the water outlet of the solar water heater 1, forming a closed water circulation geothermal heat replenishment loop. Most mining areas are located in extremely cold regions, with long heating hours in winter and little cooling in summer. Under long-term operation, underground pipes in mines can experience a heat imbalance, resulting in insufficient heating capacity. Most mining areas have abundant solar energy resources. In summer, solar cogeneration solar panels can be used to replenish excess heat to the underground pipes 6, which not only solves the heat imbalance problem but also improves the resource utilization rate of clean energy in the mining areas.

[0047] The various devices in this utility model are primarily connected via pipes 19. Each pipe 19 is equipped with a valve 20 as needed, which can be opened or closed according to process requirements. All valves 20 in this utility model are commonly used in the prior art. Temperature sensors can also be installed on each pipe 19 as needed.

[0048] As a preferred solution of this embodiment, the water inlet end of the second water pump 4 and the water inlet end of the fifth water pump 15 are both connected to the water replenishment tank 21 for replenishing water as needed.

[0049] The operation mode of the multi-energy complementary coupling system of solar energy and underground geothermal pipes in coal mines in this embodiment is:

[0050] Operation mode 1: When the weather is clear during the heating season, the heat provided by the solar water heating equipment 1 meets the load required for heating on the user side and domestic hot water in the mining area. The solar waste heat obtained by the solar water heating equipment 1 enters the heat pump unit 5 through the heat collection tank 2, and the heat distribution is adjusted by the third water pump 10 and the fifth water pump 15 to supply the heat required for heating on the user side and domestic hot water.

[0051] Operation Mode 2: During rainy weather during the heating season, when the heat provided by solar water heater 1 is insufficient for heating and domestic water needs at the user end, the heating mode is to combine solar water heater 1 and underground pipe 6 to provide heat. The waste solar heat from solar water heater 1 flows through heat collection tank 2 and enters heat pump unit 5. Geothermal heat from underground pipe 6 is then transferred to heat pump unit 5 via water collector 7 and water distributor 8. Heat distribution is then adjusted by third and fifth water pumps 10 and 15 to provide the required heat for heating and domestic hot water at the user end.

[0052] Operation mode three: During rainy weather in the heating season, when the solar water heating device 1 does not generate heat, the buried pipe 6 is used to heat the user side and provide domestic hot water. The geothermal energy obtained by the buried pipe 6 is transported to the heat pump unit 5 through the water collector 7 and the water distributor 8. The heat distribution is adjusted by the third water pump 10 and the fifth water pump 15 to supply the heat required for heating and domestic hot water to the user side.

[0053] Operation mode 4: In extreme weather during the heating season, when the heat provided by the solar water heater 1 and the buried pipe 6 still cannot meet both user-side heating and mining area domestic water needs, priority is given to user-side heating, and the insufficient domestic hot water in the mining area is provided by the electric heater 17.

[0054] Operation Mode 5: During the off-season, a portion of the heat generated by the solar water heater 1 is recharged into the underground pipe 6 to restore the geothermal balance in the coal mine, while the remaining portion is used for domestic hot water in the mining area. The solar energy captured by the solar water heater 1 is distributed by the third and sixth water pumps 10 and 16 based on the load required for domestic hot water and heating the underground pipe 6, meeting the mining area's domestic hot water and underground pipe heating needs.

Claims

1. A multi-energy complementary coupling system combining solar energy and underground geothermal pipes in a coal mine, comprising a solar water heater (1), wherein the water inlet of the solar water heater (1) is connected to the water outlet of a heating water tank (201) in a heat collecting tank (2) via a first water pump (3), and the water outlet of the solar water heater (1) is connected to the water return end of the heating water tank (201) to form a closed water circulation heating loop; and characterized in that: The heat collecting tank (2) further comprises a water collecting tank (202), the water outlet of the water collecting tank (202) being connected to the water inlet of the evaporator (501) in the heat pump unit (5) via the second water pump (4), and the water outlet of the evaporator (501) being connected to the water return port of the water collecting tank (202) to form a closed water circulation heating loop; The system further comprises a plurality of buried pipes (6), one end of each of the plurality of buried pipes (6) being connected to the input end of the second water pump (4) via a water collector (7), the output end of the second water pump (4) being connected to the water inlet end of the evaporator (501) in the heat pump unit (5), and the water outlet end of the evaporator (501) being connected to the other end of the plurality of buried pipes (6) via a water distributor (8) to form a closed water circulation heating loop.

2. The multi-energy complementary coupling system combining solar energy and underground geothermal pipes in coal mines as claimed in claim 1 is characterized in that: The water inlet of the solar water heating device (1) is connected to the output of the water collector (7) via the sixth water pump (16), and the input of the water distributor (8) is connected to the water outlet of the solar water heating device (1) to form a closed water circulation geothermal heat supply loop.

3. The multi-energy complementary coupling system combining solar energy and underground geothermal pipes in coal mines as claimed in claim 1 is characterized in that: The water outlet of the condenser (502) in the heat pump unit (5) is connected to the high-temperature side water inlet of the plate heat exchanger (9), and the high-temperature side water outlet of the plate heat exchanger (9) is connected to the return water end of the condenser (502) via the third water pump (10) to form a closed water circulation heating loop.

4. The multi-energy complementary coupling system combining solar energy and underground geothermal pipes in coal mines as claimed in claim 3 is characterized in that: The low-temperature side water outlet of the plate heat exchanger (9) is connected to the circulating water return end of the hot water storage tank (11), and the circulating water outlet of the hot water storage tank (11) is connected to the low-temperature side water inlet of the plate heat exchanger (9) through the fourth water pump (12) to form a closed water circulation heating loop.

5. The multi-energy complementary coupling system combining solar energy and underground geothermal pipes in coal mines as claimed in claim 4 is characterized in that: The hot water storage tank (11) is connected to the domestic hot water tank (13) via a seventh water pump (18) to supply water; an electric heater (17) is also installed in the domestic hot water tank (13).

6. The multi-energy complementary coupling system combining solar energy and underground geothermal pipes in coal mines as claimed in claim 3 is characterized in that: The water outlet of the condenser (502) is also connected to the water inlet of the user-side heater (14), and the water outlet of the user-side heater (14) is connected to the return water end of the condenser (502) through the fifth water pump (15) to form a closed water circulation heating loop.

7. The multi-energy complementary coupling system combining solar energy and underground geothermal pipes in coal mines as claimed in claim 6, characterized in that: The water inlet end of the second water pump (4) and the water inlet end of the fifth water pump (15) are both connected to the water supply tank (21).

8. The multi-energy complementary coupling system combining solar energy and underground geothermal pipes in coal mines as claimed in claim 1 is characterized in that: The water collector (7) and the water distributor (8) have the same structure; the water collector (7) comprises a main water pipe (701) that can be connected to a plurality of buried pipes (6); both ends of the main water pipe (701) are closed, and the main water pipe (701) is connected to an external water pipe (702); the main water pipe (701) is also provided with a drain valve (703) and an exhaust valve (704); and the external water pipe (702) is also provided with a digital balancing valve (705).

9. The multi-energy complementary coupling system combining solar energy and underground geothermal pipes in coal mines as claimed in claim 1, characterized in that: The solar water heating equipment (1) adopts a solar heat and power cogeneration solar panel; the buried pipe (6) adopts a buried pipe equipped with rectangular spiral fins.

10. The multi-energy complementary coupling system combining solar energy and underground geothermal pipes in coal mines according to claim 1, characterized in that: The water collecting tank (202) and the heating water tank (201) are connected via a water supply electric valve (203).

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