Magnesium-coal-based solid waste filling body seasonal energy storage system and method for mine

Abstract

The invention discloses a magnesium-coal-based solid waste filling body seasonal energy storage system and method for a mine, and belongs to the technical field of energy storage and conversion. The system mainly comprises a gas-liquid heat exchanger group, a filling body group, a surface air cooler group, a liquid collector, a liquid separator and a multi-stage solution pump group; the gas-liquid heat exchanger group is arranged on the ground of a mining area and a mine opening, the filling body group is arranged in a mine goaf, the surface air cooler group is arranged on a mining working face and a chamber, and the gas-liquid heat exchanger group is composed of a first gas-liquid heat exchanger, a second gas-liquid heat exchanger, a third gas-liquid heat exchanger, a fourth gas-liquid heat exchanger and a fifth gas-liquid heat exchanger. The filling body group is composed of a first filling body, a second filling body and a third filling body which are communicated through the solution pipeline, and the surface air cooler group is composed of a first surface air cooler, a second surface air cooler, a third surface air cooler and a fourth surface air cooler which are communicated through the solution pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage and conversion, and in particular to a seasonal energy storage system and method for a magnesium-coal-based solid waste filling body for a mine. Background Art

[0002] Under the background of ecological civilization construction and the transformation and upgrading of mines, the comprehensive technology combining mine filling, solid waste disposal and the empowerment of filling materials has become the key to solving the problems of goaf treatment, waste treatment and green and low-carbon mining in mines. At present, problems such as difficult disposal of mineral solid waste, high cost of mine filling, and high energy consumption in mine mining are prominent. Enterprises are faced with the dilemma of the burden of green treatment of bulk solid waste and high goaf treatment costs. Moreover, the existing mine energy supply methods have disadvantages such as high power consumption and large consumption of fossil energy. There is an urgent need for a method and system that can collect, store and utilize clean energy, while taking into account goaf treatment and waste utilization, so as to solve the existing technical problems and promote the sustainable development of the mining industry.

[0003] In the prior art, there are many disadvantages in the field of mine mining. On the one hand, the output of mineral solid waste is large and it is difficult to dispose of, the cost of filling the mine goaf is extremely high, and the energy consumption in mine mining remains high. Enterprises are faced with the dilemma of the burden of green treatment of bulk solid waste and high goaf treatment costs. On the other hand, as an important part of energy consumption in mine production, mine cooling and heating have problems such as high power consumption and large consumption of fossil energy in the existing energy supply methods such as cooling by refrigeration air conditioners and heating by coal-fired or gas-fired boilers. This not only increases the economic burden of energy use for mining enterprises, but also causes environmental pollution, and it is difficult to meet the requirements of green and low-carbon development of the mining industry. Summary of the Invention

[0004] The purpose of the present invention is to provide a seasonal energy storage system and method for a magnesium-coal-based solid waste filling body for a mine, so as to solve the problems in the prior art that the power consumption and the consumption of fossil energy for mine cooling and heating are large, which not only cause a heavy economic burden on mine energy use, but also cause environmental pollution.

[0005] The present invention provides a seasonal energy storage system for a magnesium - coal - based solid waste filling body used in a mine. The system mainly includes a gas - liquid heat exchanger group, a filling body group, a surface cooler group, a liquid collector, a liquid distributor, and a multi - stage solution pump group. The gas - liquid heat exchanger group is arranged on the ground of the mining area and at the mine entrance. The filling body group is arranged in the mined - out area of the mine. The surface cooler group is arranged at the mining working face and the chamber. The gas - liquid heat exchanger group is composed of a first gas - liquid heat exchanger, a second gas - liquid heat exchanger, a third gas - liquid heat exchanger, a fourth gas - liquid heat exchanger, and a fifth gas - liquid heat exchanger, and is connected through a solution pipeline. The filling body group is composed of a first filling body, a second filling body, and a third filling body, and is connected through a solution pipeline. The surface cooler group is composed of a first surface cooler, a second surface cooler, a third surface cooler, and a fourth surface cooler, and is connected through a solution pipeline. The multi - stage solution pump group is composed of a first multi - stage solution pump, a second multi - stage solution pump, and a third multi - stage solution pump. Inside the filling body group, there are magnesium - coal - based solid waste materials and a heat exchange tube group. Inside the solution pipeline, there is a heat exchange medium. The heat exchange medium is pushed to flow through the multi - stage solution pump group. The heat exchange medium flows into the filling body group through the liquid collector after passing through the gas - liquid heat exchanger group. The heat exchange medium flows into the gas - liquid heat exchanger group through the liquid distributor. The heat exchange medium flows into the surface cooler group through the liquid distributor. In summer, the cold energy stored in the magnesium - coal - based solid waste materials cools the heat exchange medium and pumps it into the liquid distributor. The heat exchange medium in the liquid distributor flows into the surface cooler group to cool the mining working face and the chamber. The heat exchange medium flows into the filling body group through the liquid collector. In winter, the heat energy stored in the magnesium - coal - based solid waste materials heats the heat exchange medium and pumps it into the liquid distributor. The heat exchange medium in the liquid distributor flows into the surface cooler group to heat the mining working face and the chamber. The heat exchange medium flows into the filling body group through the liquid collector.

[0006] Furthermore, the flow rates of the first multi-stage solution pump, the second multi-stage solution pump, and the third multi-stage solution pump are all 200 kg / s, the heads of the first multi-stage solution pump, the second multi-stage solution pump, and the third multi-stage solution pump are all 51 m, the powers of the first multi-stage solution pump, the second multi-stage solution pump, and the third multi-stage solution pump are all 142 kw, the temperature resistance ranges of the first multi-stage solution pump, the second multi-stage solution pump, and the third multi-stage solution pump are all from -30 degrees Celsius to 100 degrees Celsius, and the corrosion-resistant materials of the first multi-stage solution pump, the second multi-stage solution pump, and the third multi-stage solution pump are all stainless steel. In the prior art, if the specifications of the multi-stage solution pump do not meet the requirements, many drawbacks will arise. On the one hand, it may lead to insufficient flow rate and head of the pump, unable to meet the circulation requirements of the heat exchange medium in the system, affecting the efficiency of the entire seasonal energy storage system, resulting in poor cooling and heating effects in the mine, and unable to effectively utilize the cold energy and heat energy in the magnesium-coal-based solid waste filling body. On the other hand, it may cause the pump to consume too much energy during operation, increasing the operating cost of mine exploitation and reducing the economic benefits of the enterprise. In addition, the multi-stage solution pump with inconsistent specifications may frequently malfunction due to overload operation, affecting the stability and reliability of the system, shortening the service life of the equipment, increasing the maintenance cost and downtime, and thus affecting the continuity of mine exploitation. To address such problems, the present invention uses multi-stage solution pumps with appropriate specifications. The first multi-stage solution pump, the second multi-stage solution pump, and the third multi-stage solution pump provide power for the circulation of the heat exchange medium in the closed system through their flow rate of 200 kg / s and head of 51 m, ensuring that the heat exchange medium can effectively flow between the gas-liquid heat exchanger group, the filling body group, and the surface cooler group. Their power of 142 kw ensures the efficient operation of the pump, and the temperature resistance range from -30°C to 100°C enables it to work stably under extreme temperature conditions. The stainless steel corrosion-resistant material ensures the service life of the pump in a harsh environment, achieving the effect of ensuring the efficient circulation of the heat exchange medium in the system, improving the overall efficiency of the seasonal energy storage system, significantly improving the cooling and heating effects in the mine, and fully utilizing the cold energy and heat energy in the magnesium-coal-based solid waste filling body. Secondly, optimizing the power and temperature resistance range of the pump reduces the energy consumption of the pump during operation, reduces the operating cost of mine exploitation, and enhances the economic benefits of the enterprise. In addition, enhancing the corrosion resistance and reliability of the pump reduces the failure frequency caused by overload operation, extends the service life of the equipment, reduces the maintenance cost and downtime, and ensures the continuity and stability of mine exploitation.

[0007] Furthermore, one end of the first multi-stage solution pump is connected to a solution pipeline, the top end of the solution pipeline is connected to a water tank, and the top of the water tank is threadedly connected with a water tank cover. In the prior art, if there is no place for exhausting air and adding heat exchange medium in a fluid-containing energy storage system, there will be various drawbacks. On the one hand, the air in the system cannot be effectively exhausted, which will cause air to be mixed into the heat exchange medium, affecting the heat exchange effect, reducing the overall efficiency of the system, resulting in poor mine cooling and heating effects, and unable to fully exert the energy storage function of the magnesium-coal-based solid waste filling body. On the other hand, the lack of a place for adding heat exchange medium means that during the operation of the system, once the heat exchange medium is lost or leaks, it cannot be replenished in time, resulting in the system being unable to operate normally, affecting the continuity of mine exploitation. In addition, the presence of air may also cause problems such as corrosion, shortening the service life of equipment, increasing maintenance costs, reducing the reliability and stability of the system, and being unfavorable to the green and low-carbon development of the mining industry. To address such problems, the present invention adopts a structure with the highest point connected to a water tank. The water tank is located at the highest point of the system and is connected to other components in the system through a connecting pipe. Its working principle is to utilize the height difference of the water tank to enable the natural circulation of the heat exchange medium under the action of gravity. At the same time, the water tank serves as the air exhaust and liquid replenishment point for the system. When the system is operating, the heat exchange medium will carry the air in the system and rise to the water tank during the circulation process. Since the water tank is at the highest position, the air will accumulate in the water tank and be discharged from the system, thus ensuring that the heat exchange medium does not contain air and improving the heat exchange efficiency. At the same time, the water tank is also used to replenish the heat exchange medium. When there is a loss or adjustment of the heat exchange medium in the system, it can be added in time through the water tank to ensure the normal operation of the system, achieving the effect of effectively discharging to ensure the purity of the heat exchange medium, improving the heat exchange efficiency, fully exerting the energy storage function of the magnesium-coal-based solid waste filling body, enhancing the mine cooling and heating effects, optimizing the overall performance of the system. Secondly, adding the function of adding heat exchange medium can timely replenish the lost or leaked medium during the operation of the system, ensure the continuous and stable operation of the system, reduce the downtime caused by insufficient medium, and improve the continuity of mine exploitation. In addition, reducing the air mixing can reduce the corrosion risk, extend the service life of equipment, reduce maintenance costs, and enhance the reliability and stability of the system.

[0008] Furthermore, one end of the liquid distributor is connected to, and one end of the is connected to a fifth gas-liquid heat exchanger. The liquid outlet end of the fifth gas-liquid heat exchanger is connected to a third multi-stage solution pump, and the third multi-stage solution pump is connected to one side of the liquid distributor. Through the connection of the liquid distributor with the fifth gas-liquid heat exchanger and the third multi-stage solution pump, the function specifically for preventing freezing at the mine entrance is realized. In winter, after the heat energy stored in the magnesium-coal-based solid waste material heats the heat exchange medium, the heat exchange medium is pumped to the liquid distributor by the third multi-stage solution pump, and then distributed by the liquid distributor to the fifth gas-liquid heat exchanger to heat up the mine entrance, effectively preventing the mine entrance from freezing and ensuring the safe exploitation of the mine in winter.

[0009] Further, a first valve is connected between the liquid inlet and the liquid outlet of the first gas-liquid heat exchanger, a second valve is connected between the liquid inlet and the liquid outlet of the second gas-liquid heat exchanger, a third valve is connected between the liquid inlet and the liquid outlet of the third gas-liquid heat exchanger, and a fourth valve is connected between the liquid inlet and the liquid outlet of the fourth gas-liquid heat exchanger. By connecting corresponding valves between the liquid inlets and the liquid outlets of each gas-liquid heat exchanger, the operating state of each heat exchanger can be flexibly controlled. When it is necessary to adjust the heat exchange efficiency, the corresponding valve can be opened or closed to change the flow path and flow rate of the heat exchange medium, thereby achieving precise regulation of the heat exchange efficiency. This design not only improves the flexibility and controllability of the system, but also optimizes the heat exchange process according to actual needs, improves energy utilization efficiency, reduces operating costs. At the same time, the setting of the valves is also conducive to the maintenance and overhaul of the system, enhancing the reliability and stability of the system.

[0010] Further, rollers are provided at the bottoms of the first surface cooler, the second surface cooler, the third surface cooler, and the fourth surface cooler. The rollers provided at the bottoms of the first surface cooler, the second surface cooler, the third surface cooler, and the fourth surface cooler ensure that the surface coolers can be conveniently moved. The setting of the rollers enables the surface coolers to be flexibly adjusted according to actual needs, facilitating installation and use in different mining working faces or chambers, improving the versatility and adaptability of the equipment. At the same time, the convenient mobility is also conducive to the maintenance and overhaul of the equipment, reducing the limitations and inconveniences brought by the fixed installation of the equipment, and improving work efficiency and equipment utilization rate.

[0011] Further, there are no less than five heat exchangers in the gas-liquid heat exchanger group. Significantly improve the heat exchange efficiency and energy utilization efficiency of the system. Multiple heat exchangers can work simultaneously, increasing the heat exchange area, thereby more effectively capturing and transferring the energy in natural cold sources and heat sources. This not only improves the adaptability of the system in different seasons and different environmental conditions, but also ensures the stable operation of the system under extreme high or low temperature conditions. By reasonably distributing multiple heat exchangers, the thermodynamic performance of the entire system can be optimized, energy loss can be reduced, and energy conversion efficiency can be improved, thereby reducing energy consumption and operating costs during the mining process.

[0012] Furthermore, the liquid inlets of the first gas-liquid heat exchanger, the second gas-liquid heat exchanger, the third gas-liquid heat exchanger, and the fourth gas-liquid heat exchanger are all connected to a first liquid inlet pipe. The top of the first liquid inlet pipe is connected to a first downward pipe. The bottom of the first downward pipe is connected to a first buffer pipe. The top of the first buffer pipe is connected to a second downward pipe. The bottom of the second downward pipe is connected to a liquid outlet, and the liquid outlet is connected to the liquid outlet. Both the second downward pipe and the first downward pipe are spiral. The design of the spiral downward pipe increases the residence time of the heat exchange medium in the pipe, extends the heat exchange time, thereby improving the heat exchange efficiency. At the same time, the spiral structure can also slow down the falling speed of the medium, reduce the impact of the medium on the pipe, protect the pipe structure, and extend the service life. This design optimizes the thermodynamic performance of the system, ensures the high efficiency and stability of the heat exchange process, and provides strong support for the efficient operation of the entire seasonal energy storage system.

[0013] A seasonal energy storage method for a magnesium-coal-based solid waste filling body used in a mine, comprising the following steps:

[0014] Sp1: In summer, the cold energy stored in the magnesium-coal-based solid waste material cools the heat exchange medium through a heat exchange tube bundle. The heat exchange medium flows in the solution pipeline and is powered by a multi-stage solution pump group;

[0015] Sp2: The cooled heat exchange medium is pumped to a distributor, and the distributor evenly distributes the heat exchange medium to the first surface cooler, the second surface cooler, the third surface cooler, and the fourth surface cooler in the mining face or chamber;

[0016] Sp3: The first surface cooler, the second surface cooler, the third surface cooler, and the fourth surface cooler use the cold energy of the heat exchange medium to cool the mining face or chamber;

[0017] Sp4: The heated heat exchange medium returns from the surface cooler group to the liquid collector, and the liquid collector collects the heat exchange medium and redistributes it to the heat exchange tube bundle to complete the replacement of cold energy;

[0018] Sp5: The heat exchange medium circulates in the system, continuously releases cold energy, and maintains a low-temperature environment in the working face or chamber.

[0019] Furthermore, it includes the following steps:

[0020] Sp6: In winter, the heat energy stored in the magnesium-coal-based solid waste material heats the heat exchange medium through 36. The heat exchange medium flows in the solution pipeline and is powered by a multi-stage solution pump group;

[0021] Sp7: The heated heat exchange medium is pumped to a distributor, and the distributor evenly distributes the heat exchange medium to the first surface cooler, the second surface cooler, the third surface cooler, the fourth surface cooler, and the fifth gas-liquid heat exchanger in the mining face or chamber;

[0022] Sp8: The surface cooler group uses the thermal energy of the heat exchange medium to heat up the mining working face or chamber. The heated air circulates in the working face or chamber to increase the ambient temperature. The fifth gas-liquid heat exchanger uses the thermal energy of the heat exchange medium to prevent freezing at the wellhead.

[0023] Sp9: The cooled heat exchange medium returns from the surface cooler group or the fifth gas-liquid heat exchanger to the liquid distributor. The liquid distributor collects the heat exchange medium and redistributes it to the heat exchange tube bundle to complete the replacement of thermal energy.

[0024] Sp10: The heat exchange medium circulates in the system, continuously releasing thermal energy to maintain a high-temperature environment in the working face or chamber, while preventing the wellhead from freezing.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] First, in the present invention, the system captures natural cold sources and heat sources through a gas-liquid heat exchanger group composed of the first gas-liquid heat exchanger, the second gas-liquid heat exchanger, the third gas-liquid heat exchanger, the fourth gas-liquid heat exchanger, and the fifth gas-liquid heat exchanger. The heat exchange medium is circulated in a closed system by a multi-stage solution pump group including the first multi-stage solution pump, the second multi-stage solution pump, and the third multi-stage solution pump. After the heat exchange medium exchanges heat with the natural environment in the gas-liquid heat exchanger, it flows into the filling body group including the first filling body, the second filling body, and the third filling body through the liquid collector. The magnesium-coal-based solid waste material inside the filling body stores cold energy or thermal energy. In summer, the cold energy in the filling body cools the heat exchange medium, and the medium is distributed by the liquid distributor to the surface cooler group, the second surface cooler, the third surface cooler, and the fourth surface cooler (composed of) to cool the mining working face and chamber; in winter, the thermal energy in the filling body heats the heat exchange medium, and the medium is distributed by the liquid distributor to the surface cooler group to heat the mining working face and chamber and is also used for wellhead anti-freezing, achieving the effect of effectively reducing the difficulty of mineral solid waste disposal and the cost of mine goaf filling, reducing the green treatment burden of the enterprise's bulk solid waste, making the mine mining process more economically feasible; on the other hand, by adopting methods and systems for collecting, storing, and utilizing clean energy to replace traditional methods such as refrigeration air-conditioning for cooling and coal or gas boilers for heating, the power consumption and fossil energy consumption can be significantly reduced, the energy economic burden of mining enterprises can be reduced, environmental pollution can be alleviated, and it can help the green and low-carbon development of the mining industry. In addition, it can improve the utilization rate of mine resources, realize the resource recycling of solid waste, promote the sustainable development of the mining industry, coordinate mine mining with ecological environment protection, and contribute to the construction of ecological civilization.

[0027] Second, the present invention uses the first multi-stage solution pump, the second multi-stage solution pump, and the third multi-stage solution pump to provide power for the circulation of the heat exchange medium in the closed system through a flow rate of 200 kg / s and a head of 51 m in the system, ensuring that the heat exchange medium can flow effectively among the gas-liquid heat exchanger group, the filling body group, and the surface cooler group. Their 142-kw power guarantees the efficient operation of the pump, and the temperature resistance range of -30°C to 100°C enables it to work stably under extreme temperature conditions. The stainless steel corrosion-resistant material ensures the service life of the pump in a harsh environment, achieving the effect of ensuring the efficient circulation of the heat exchange medium in the system, improving the overall efficiency of the seasonal energy storage system, significantly improving the mine cooling and heating effects, and making full use of the cold and heat energy in the magnesium-coal-based solid waste filling body. Secondly, optimizing the power and temperature resistance range of the pump reduces the energy consumption during the operation of the pump, reduces the operating costs of mine exploitation, and enhances the economic benefits of the enterprise. In addition, enhancing the corrosion resistance and reliability of the pump reduces the failure frequency caused by overload operation, extends the service life of the equipment, reduces the maintenance cost and downtime, and ensures the continuity and stability of mine exploitation.

[0028] Thirdly, the present invention adopts the highest-end communicating water tank structure. The water tank is located at the highest point of the system and is connected to other components in the system through a communicating pipe. Its working principle is to utilize the height difference of the water tank to enable the natural circulation of the heat exchange medium under the action of gravity. At the same time, the water tank serves as the exhaust and liquid replenishment point of the system. When the system operates, the heat exchange medium will carry the air in the system and rise to the water tank during the circulation process. Since the water tank is at the highest position, the air will gather in the water tank and be discharged from the system, thus ensuring that the heat exchange medium does not contain air and improving the heat exchange efficiency. At the same time, the water tank is also used to supplement the heat exchange medium. When there is a loss or adjustment of the heat exchange medium in the system, it can be added in time through the water tank to ensure the normal operation of the system, achieving the effect of effectively discharging to ensure the purity of the heat exchange medium, improving the heat exchange efficiency, giving full play to the energy storage function of the magnesium-coal-based solid waste filling body, enhancing the mine cooling and heating effects, and optimizing the overall performance of the system. Secondly, adding the function of adding the heat exchange medium can timely supplement the lost or leaked medium during the operation of the system, ensure the continuous and stable operation of the system, reduce the downtime caused by insufficient medium, and improve the continuity of mine exploitation. In addition, reducing the air mixing can reduce the corrosion risk, extend the service life of the equipment, reduce the maintenance cost, and enhance the reliability and stability of the system.

[0029] Fourthly, in the present invention, through the connection of the distributor with the fifth gas-liquid heat exchanger and the third multi-stage solution pump, the function specifically for preventing freezing at the mine entrance is realized. In winter, after the heat energy stored in the magnesium-coal-based solid waste material heats the heat exchange medium, the heat exchange medium is pumped to the distributor by the third multi-stage solution pump and then distributed to the fifth gas-liquid heat exchanger by the distributor to heat up the mine entrance, effectively preventing the mine entrance from freezing and ensuring the safe exploitation of the mine in winter.

[0030] Fifthly, in the present invention, the spiral falling pipe design increases the residence time of the heat exchange medium in the pipe, extends the heat exchange time, thereby improving the heat exchange efficiency. At the same time, the spiral structure can also slow down the falling speed of the medium, reduce the impact of the medium on the pipe, protect the pipe structure, and extend the service life. This design optimizes the thermodynamic performance of the system, ensures the high efficiency and stability of the heat exchange process, and provides strong support for the efficient operation of the entire seasonal energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 is a three-dimensional structure schematic diagram of the present invention;

[0033] Figure 2 is a schematic diagram of the heat exchange tube group in the present invention;

[0034] Figure 3 is a three-dimensional structure schematic diagram of the heat exchanger in the present invention;

[0035] Figure 4 is a cross-sectional view of the heat exchanger in the present invention;

[0036] Figure 5 is Figure 4 an enlarged view of part A in

[0037] Figure 6 is a seasonal energy storage system diagram of the magnesium-coal-based solid waste filling body in the present invention;

[0038] Figure 7 is a cross-sectional view of the magnesium-coal-based solid waste filling body in the present invention;

[0039] Figure 8 is a structure diagram of the liquid collector in the present invention;

[0040] Figure 9 is a structure diagram of the liquid distributor in the present invention.

[0041] Reference numerals:

[0042] 1. First filling body; 2. Second filling body; 3. Third filling body; 4. Mine working face; 5. Chamber; 6. Surface of mine roadway; 7. Magnesium-coal-based solid waste material; 8. Divider; 9. Collector; 10. First gas-liquid heat exchanger; 11. Second gas-liquid heat exchanger; 12. Third gas-liquid heat exchanger; 13. Fourth gas-liquid heat exchanger; 14. Fifth gas-liquid heat exchanger; 15. Mine entrance roadway; 16. Water tank; 17. First valve; 18. Second valve; 19. Third valve; 20. Fourth valve; 21. First multi-stage solution pump; 22. Fifth valve; 23. Sixth valve; 24. Seventh valve; 25. Eighth valve; 26. Ninth valve; 27. Second multi-stage solution pump; 28. Third multi-stage solution pump; 29. First surface cooler; 30. Second surface cooler; 31. Third surface cooler; 32. Fourth surface cooler; 33. Solution pipeline; 34. Tenth valve; 35. Eleventh valve; 36. Heat exchange tube group; 37. Ground; 801. First heat exchange medium outlet of divider; 802. First heat exchange medium inlet of divider; 803. Five heat exchange medium inlets of divider; 804. Second heat exchange medium inlet of divider; 901. First heat exchange medium inlet of collector; 902. Second heat exchange medium inlet; 903. Four heat exchanger medium outlets of collector; 1001. First liquid inlet pipeline; 1002. First falling pipeline; 1003. First buffer pipeline; 1004. Second falling pipeline; 1005. Liquid outlet. Detailed implementation manners

[0043] The technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0044] The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention.

[0045] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Specific Embodiment 1:

[0049] The following combination Figures 1 to 9As shown in the figure, an embodiment of the present invention provides a seasonal energy storage system for a magnesium-coal-based solid waste filling body used in a mine. The system mainly includes a gas-liquid heat exchanger group, a filling body group, a surface cooler group, a liquid collector 9, a liquid distributor 8, and a multi-stage solution pump group. The gas-liquid heat exchanger group is arranged on the ground of the mining area and the mine entrance. The filling body group is arranged in the mined-out area of the mine. The surface cooler group is arranged in the mining face and the chamber. The gas-liquid heat exchanger group is composed of a first gas-liquid heat exchanger 10, a second gas-liquid heat exchanger 11, a third gas-liquid heat exchanger 12, a fourth gas-liquid heat exchanger 13, and a fifth gas-liquid heat exchanger 14, and is connected through a solution pipeline 33. The filling body group is composed of a first filling body 1, a second filling body 2, and a third filling body 3, and is connected through a solution pipeline 33. The surface cooler group is composed of a first surface cooler 29, a second surface cooler 30, a third surface cooler 31, and a fourth surface cooler 32, and is connected through a solution pipeline 33. The multi-stage solution pump group is composed of a first multi-stage solution pump 21, a second multi-stage solution pump 27, and a third multi-stage solution pump 28. Inside the filling body group, there are magnesium-coal-based solid waste materials 7 and a heat exchange tube group 36. Inside the solution pipeline 33, there is a heat exchange medium. The heat exchange medium is pushed to flow through the multi-stage solution pump group. The heat exchange medium flows into the filling body group through the liquid collector 9 after passing through the gas-liquid heat exchanger group. The heat exchange medium flows into the gas-liquid heat exchanger group through the liquid distributor 8. The heat exchange medium flows into the surface cooler group through the liquid distributor 8. In summer, the cold energy stored in the magnesium-coal-based solid waste materials 7 cools the heat exchange medium and pumps it into the liquid distributor 8. The heat exchange medium in the liquid distributor 8 flows into the surface cooler group to cool the mining face and the chamber. The heat exchange medium flows into the filling body group through the liquid collector 9. In winter, the heat energy stored in the magnesium-coal-based solid waste materials 7 heats the heat exchange medium and pumps it into the liquid distributor 8. The heat exchange medium in the liquid distributor 8 flows into the surface cooler group to heat the mining face and the chamber. The heat exchange medium flows into the filling body group through the liquid collector 9.In the prior art, there are various drawbacks in the field of mine exploitation. On the one hand, the output of mineral solid waste is large and its disposal is difficult. The cost of filling mined-out areas in mines is extremely high, and the energy consumption in mine exploitation remains high. Enterprises are faced with the dilemma of the heavy burden of green treatment of bulk solid waste and the high cost of mined-out area treatment. On the other hand, as an important part of energy consumption in mine production, mine cooling and heating have problems such as large power consumption and large consumption of fossil energy in existing energy supply methods such as cooling by refrigeration air conditioners and heating by coal or gas boilers. This not only increases the economic burden of energy consumption for mining enterprises but also causes environmental pollution and is difficult to meet the requirements of the green and low-carbon development of the mining industry. To address such problems, the present invention adopts a seasonal energy storage system. This system captures natural cold sources and heat sources through a gas-liquid heat exchanger group composed of a first gas-liquid heat exchanger 10, a second gas-liquid heat exchanger 11, a third gas-liquid heat exchanger 12, a fourth gas-liquid heat exchanger 13, and a fifth gas-liquid heat exchanger 14. The heat transfer medium is circulated in a closed system by a multi-stage solution pump group including a first multi-stage solution pump 21, a second multi-stage solution pump 27, and a third multi-stage solution pump 28. After the heat transfer medium exchanges heat with the natural environment in the gas-liquid heat exchanger, it flows into a filling body group including a first filling body 1, a second filling body 2, and a third filling body 3 through a liquid collector 9. The magnesium-coal-based solid waste material 7 inside the filling body stores cold energy or heat energy. In summer, the cold energy in the filling body cools the heat transfer medium, and the medium is distributed to a surface cooler group composed of a first surface cooler 29, a second surface cooler 30, a third surface cooler 31, and a fourth surface cooler 32 through a liquid distributor 8 to cool the mining working face and chambers. In winter, the heat energy in the filling body heats the heat transfer medium, and the medium is distributed to the surface cooler group through the liquid distributor 8 to heat the mining working face and chambers and is also used for freeze protection at the wellhead.

[0050] Specifically, the flow rates of the first multi-stage solution pump 21, the second multi-stage solution pump 27, and the third multi-stage solution pump 28 are all 200 kg / s, the head of the first multi-stage solution pump 21, the second multi-stage solution pump 27, and the third multi-stage solution pump 28 is all 51 m, the power of the first multi-stage solution pump 21, the second multi-stage solution pump 27, and the third multi-stage solution pump 28 is all 142 kw, the temperature resistance range of the first multi-stage solution pump 21, the second multi-stage solution pump 27, and the third multi-stage solution pump 28 is -30 degrees Celsius to 100 degrees Celsius, and the corrosion-resistant material of the first multi-stage solution pump 21, the second multi-stage solution pump 27, and the third multi-stage solution pump 28 is stainless steel. In the prior art, if the specifications of the multi-stage solution pump do not meet the requirements, many drawbacks will occur. On the one hand, it may lead to insufficient flow rate and head of the pump, unable to meet the circulation requirements of the heat exchange medium in the system, affecting the efficiency of the entire seasonal energy storage system, resulting in poor mine cooling and heating effects, and unable to effectively utilize the cold energy and heat energy in the magnesium-coal-based solid waste filling body. On the other hand, it may cause the pump to consume too much energy during operation, increase the operating cost of mine exploitation, reduce the economic benefits of the enterprise. In addition, the multi-stage solution pump with inconsistent specifications may also frequently malfunction due to overload operation, affecting the stability and reliability of the system, shortening the service life of the equipment, increasing the maintenance cost and downtime, and thus affecting the continuity of mine exploitation. To address such problems, the present invention adopts multi-stage solution pumps with appropriate specifications. The first multi-stage solution pump 21, the second multi-stage solution pump 27, and the third multi-stage solution pump 28 provide power for the circulation of the heat exchange medium in the closed system through their flow rate of 200 kg / s and head of 51 m, ensuring that the heat exchange medium can effectively flow between the gas-liquid heat exchanger group, the filling body group, and the surface cooler group. Their power of 142 kw ensures the efficient operation of the pump, and the temperature resistance range of -30°C to 100°C enables it to work stably under extreme temperature conditions. The stainless steel corrosion-resistant material ensures the service life of the pump in a harsh environment.

[0051] Specifically, one end of the first multi-stage solution pump 21 is connected to a solution pipeline 33, and the top end of the solution pipeline 33 is connected to a water tank 16. The top of the water tank 16 is threadedly connected with a water tank cover. In the prior art, if there is no place to exhaust air and add heat exchange medium in a fluid-containing energy storage system, there will be various drawbacks. On the one hand, the air in the system cannot be effectively exhausted, which will cause air to be mixed into the heat exchange medium, affecting the heat exchange effect, reducing the overall efficiency of the system, resulting in poor mine cooling and heating effects, and unable to fully exert the energy storage function of the magnesium-coal-based solid waste filling body. On the other hand, the lack of a place to add heat exchange medium makes it impossible to replenish the heat exchange medium in time once it is lost or leaked during the operation of the system, resulting in the system being unable to operate normally and affecting the continuity of mine exploitation. In addition, the presence of air may also cause problems such as corrosion, shortening the service life of equipment, increasing maintenance costs, reducing the reliability and stability of the system, and being unfavorable to the green and low-carbon development of the mining industry. To address such problems, the present invention adopts a structure with the highest end connected to the water tank. The water tank 16 is located at the highest point of the system and is connected to other components in the system through a connecting pipe. Its working principle is to utilize the height difference of the water tank 16 to enable the heat exchange medium to circulate naturally under the action of gravity. At the same time, the water tank 16 serves as the air exhaust and liquid replenishment point of the system. When the system operates, the heat exchange medium will carry the air in the system and rise to the water tank 16 during the circulation process. Since the water tank 16 is at the highest position, the air will accumulate in the water tank 16 and be discharged from the system, thereby ensuring that the heat exchange medium does not contain air and improving the heat exchange efficiency. At the same time, the water tank 16 is also used to supplement the heat exchange medium. When the heat exchange medium in the system is lost or needs to be adjusted, it can be added in time through the water tank 16 to ensure the normal operation of the system.

[0052] Specifically, one end of the liquid distributor 8 is connected to 26, one end of 26 is connected to the fifth gas-liquid heat exchanger 14, and the liquid outlet end of the fifth gas-liquid heat exchanger 14 is connected to the third multi-stage solution pump 28, and the third multi-stage solution pump 28 is connected to one side of the liquid distributor 8. Through the connection of the liquid distributor 8 with the fifth gas-liquid heat exchanger 14 and the third multi-stage solution pump 28, the function of specifically preventing freezing at the mine entrance is realized. In winter, after the heat energy stored in the magnesium-coal-based solid waste material 7 heats the heat exchange medium, the heat exchange medium is pumped to the liquid distributor 8 by the third multi-stage solution pump 28, and then distributed to the fifth gas-liquid heat exchanger 14 by the liquid distributor 8 to heat up the mine entrance, effectively preventing the mine entrance from freezing and ensuring the safe mining of the mine in winter. Specifically, a first valve 17 is connected between the liquid inlet and outlet of the first gas-liquid heat exchanger 10, a second valve 18 is connected between the liquid inlet and outlet of the second gas-liquid heat exchanger 11, a third valve 19 is connected between the liquid inlet and outlet of the third gas-liquid heat exchanger 12, and a fourth valve 20 is connected between the liquid inlet and outlet of the fourth gas-liquid heat exchanger 13. By connecting the corresponding valves between the liquid inlet and outlet of each gas-liquid heat exchanger, the operating state of each heat exchanger can be flexibly controlled. When it is necessary to adjust the heat exchange efficiency, the corresponding valves can be opened or closed to change the flow path and flow rate of the heat exchange medium, thereby realizing the precise adjustment of the heat exchange efficiency. This design not only improves the flexibility and controllability of the system, but also can optimize the heat exchange process according to actual needs, improve the energy utilization efficiency, reduce the operating cost. At the same time, the setting of the valves is also conducive to the maintenance and repair of the system, enhancing the reliability and stability of the system. Specifically, rollers are provided at the bottoms of the first surface cooler 29, the second surface cooler 30, the third surface cooler 31, and the fourth surface cooler 32. Rollers are provided at the bottoms of the first surface cooler 29, the second surface cooler 30, the third surface cooler 31, and the fourth surface cooler 32. This design ensures that the surface coolers can be conveniently moved. The setting of the rollers enables the surface coolers to be flexibly adjusted in position according to actual needs, facilitating installation and use in different mining working faces or chambers, improving the versatility and adaptability of the equipment. At the same time, the convenient mobility is also conducive to the maintenance and repair of the equipment, reducing the limitations and inconveniences brought by the fixed installation of the equipment, and improving the work efficiency and equipment utilization rate.

[0053] Specifically, there are no less than 5 heat exchangers in the gas-liquid heat exchanger group. This significantly improves the heat exchange efficiency and energy utilization efficiency of the system. Multiple heat exchangers can work simultaneously, increasing the heat exchange area, thus more effectively capturing and transferring the energy in natural cold sources and heat sources. This not only improves the adaptability of the system under different seasons and environmental conditions but also ensures the stable operation of the system under extreme high or low temperature conditions. By reasonably distributing multiple heat exchangers, the thermodynamic performance of the entire system can be optimized, energy losses can be reduced, and the energy conversion efficiency can be improved, thereby reducing the energy consumption and operating costs during the mining process. Specifically, the inlets of the first gas-liquid heat exchanger 10, the second gas-liquid heat exchanger 11, the third gas-liquid heat exchanger 12, and the fourth gas-liquid heat exchanger 13 are all connected to a first inlet pipeline 1001. The top of the first inlet pipeline 1001 is connected to a first falling pipeline 1002. The bottom of the first falling pipeline 1002 is connected to a first buffer pipeline 1003. The top of the first buffer pipeline 1003 is connected to a second falling pipeline 1004. The bottom of the second falling pipeline 1004 is connected to an outlet 1005, and the outlet 1005 is connected to the outlet. Both the second falling pipeline 1004 and the first falling pipeline 1002 are spiral. The design of the spiral falling pipeline increases the residence time of the heat exchange medium in the pipeline, prolongs the heat exchange time, thereby improving the heat exchange efficiency. At the same time, the spiral structure can also slow down the falling speed of the medium, reduce the impact of the medium on the pipeline, protect the pipeline structure, and extend the service life. This design optimizes the thermodynamic performance of the system, ensures the high efficiency and stability of the heat exchange process, and provides strong support for the efficient operation of the entire seasonal energy storage system. Specific Embodiment 2:

[0055] A seasonal energy storage method for a magnesium-coal-based solid waste filling body in a mine includes the following steps:

[0056] Sp1: In summer, the cold energy stored in the magnesium-coal-based solid waste material 7 cools the heat exchange medium through the heat exchange tube group 36. The heat exchange medium flows in the solution pipeline 33 and is powered by a multi-stage solution pump group.

[0057] Sp2: The cooled heat exchange medium is pumped to the distributor 8, and the distributor 8 evenly distributes the heat exchange medium to the first surface cooler 29, the second surface cooler 30, the third surface cooler 31, and the fourth surface cooler 32 in the mining working face or chamber.

[0058] Sp3: The first surface cooler 29, the second surface cooler 30, the third surface cooler 31, and the fourth surface cooler 32 use the cold energy of the heat exchange medium to cool the mining working face or chamber.

[0059] Sp4: The heated heat exchange medium returns from the surface cooler group to the collector 9, and the collector 9 collects the heat exchange medium and redistributes it to the heat exchange tube group 36 to complete the replacement of cold energy.

[0060] Sp5: The heat exchange medium circulates in the system, continuously releasing cold energy to maintain a low-temperature environment at the working face or in the chamber.

[0061] Specifically, it includes the following steps:

[0062] Sp6: In winter, the heat energy stored in the magnesium-coal-based solid waste material 7 heats the heat exchange medium through 36. The heat exchange medium flows in the solution pipeline 33 and is powered by a multi-stage solution pump group;

[0063] Sp7: The heated heat exchange medium is pumped to the distributor 8. The distributor 8 evenly distributes the heat exchange medium to the first surface cooler 29, the second surface cooler 30, the third surface cooler 31, the fourth surface cooler 32, and the fifth gas-liquid heat exchanger 14 in the mining working face or the chamber;

[0064] Sp8: The surface cooler group uses the heat energy of the heat exchange medium to heat the mining working face or the chamber. The heated air circulates in the working face or the chamber to increase the environmental temperature. The fifth gas-liquid heat exchanger 14 uses the heat energy of the heat exchange medium to prevent freezing at the wellhead;

[0065] Sp9: The cooled heat exchange medium returns from the surface cooler group or the fifth gas-liquid heat exchanger 14 to the distributor 8. The distributor 8 collects the heat exchange medium and redistributes it to the heat exchange tube group 36 to complete the replacement of heat energy;

[0066] Sp10: The heat exchange medium circulates in the system, continuously releasing heat energy to maintain a high-temperature environment at the working face or in the chamber, and at the same time preventing the wellhead from freezing.

[0067] The working principle of the present invention:

[0068] In the present invention, the system captures natural cold sources and heat sources through a gas-liquid heat exchanger group composed of a first gas-liquid heat exchanger 10, a second gas-liquid heat exchanger 11, a third gas-liquid heat exchanger 12, a fourth gas-liquid heat exchanger 13, and a fifth gas-liquid heat exchanger 14. The heat transfer medium is circulated in a closed system by a multi-stage solution pump group including a first multi-stage solution pump 21, a second multi-stage solution pump 27, and a third multi-stage solution pump 28. After the heat transfer medium exchanges heat with the natural environment in the gas-liquid heat exchanger, it flows into a filling body group including a first filling body 1, a second filling body 2, and a third filling body 3 through a liquid collector 9. The magnesium-coal-based solid waste material 7 inside the filling body stores cold energy or heat energy. In summer, the cold energy in the filling body cools the heat transfer medium, and the medium is distributed to a surface cooler group composed of a first surface cooler 29, a second surface cooler 30, a third surface cooler 31, and a fourth surface cooler 32 through a liquid distributor 8 to cool the mining face and the chamber. In winter, the heat energy in the filling body heats the heat transfer medium, and the medium is distributed to the surface cooler group through the liquid distributor 8 to heat the mining face and the chamber and is also used for anti-freezing at the wellhead. The present invention uses multi-stage solution pumps of appropriate specifications. The first multi-stage solution pump 21, the second multi-stage solution pump 27, and the third multi-stage solution pump 28 provide power for the circulation of the heat transfer medium in the closed system through their flow rate of 200 kg / s and head of 51 m, ensuring that the heat transfer medium can flow effectively between the gas-liquid heat exchanger group, the filling body group, and the surface cooler group. Their power of 142 kw ensures the efficient operation of the pumps. The temperature resistance range of -30°C to 100°C enables them to work stably under extreme temperature conditions, and the stainless steel corrosion-resistant material ensures the service life of the pumps in a harsh environment. The present invention adopts the highest-end connected water tank structure. The water tank 16 is located at the highest point of the system and is connected to other components in the system through a connecting pipe. Its working principle is to utilize the height difference of the water tank 16 to enable the natural circulation of the heat transfer medium under the action of gravity. At the same time, the water tank 16 serves as the exhaust and liquid supplement point of the system. When the system is running, the heat transfer medium will carry the air in the system and rise to the water tank 16 during the circulation process. Since the water tank 16 is at the highest position, the air will accumulate in the water tank 16 and be discharged from the system, thus ensuring that the heat transfer medium does not contain air and improving the heat transfer efficiency. At the same time, the water tank 16 is also used to supplement the heat transfer medium. When there is a loss or adjustment of the heat transfer medium in the system, it can be added in time through the water tank 16 to ensure the normal operation of the system.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A magnesium-coal-based solid waste filling seasonal energy storage system for mines, characterized by: The system mainly comprises a gas-liquid heat exchanger group, a filling body group, a surface cooler group, a liquid collector (9), a liquid distributor (8) and a multi-stage solution pump group. The gas-liquid heat exchanger group is arranged on the ground and the mine entrance of the mining area, the filling body group is arranged in the mining goaf, the surface cooler group is arranged in the mining working face and the chamber, the gas-liquid heat exchanger group is composed of a first gas-liquid heat exchanger (10), a second gas-liquid heat exchanger (11), a third gas-liquid heat exchanger (12), a fourth gas-liquid heat exchanger (13) and a fifth gas-liquid heat exchanger (14), and they are connected through a solution pipeline (33), the filling body group is composed of a first filling body (1), a second filling body (2) and a third filling body (3), and they are connected through a solution pipeline (33), the surface cooler group The multistage solution pump group is composed of a first surface cooler (29), a second surface cooler (30), a third surface cooler (31) and a fourth surface cooler (32), and is connected through a solution pipeline (33). The multistage solution pump group is composed of a first multistage solution pump (21), a second multistage solution pump (27) and a third multistage solution pump (28). The filling body group is provided with a magnesium-coal-based solid waste material (7) and a heat exchange tube group (36). The solution pipeline (33) is provided with a heat exchange medium. The heat exchange medium is driven to flow by the multistage solution pump group. The heat exchange medium flows through the gas-liquid heat exchanger group through the liquid collector (9) and into the filling body group. The heat exchange medium flows through the liquid separator (8) and into the gas-liquid heat exchanger group. The heat exchange medium flows through the liquid separator (8) and into the surface cooler group. In summer, the cold energy stored in the magnesium-coal-based solid waste material (7) cools the heat exchange medium and pumps it into the liquid separator (8). The heat exchange medium in the liquid separator (8) flows into the surface cooler group to cool the mining working face and the chamber. The heat exchange medium flows into the filling body group through the liquid collector (9); In winter, the heat energy stored in the magnesium-coal-based solid waste material (7) heats the heat exchange medium and is pumped into the liquid separator (8). The heat exchange medium in the liquid separator (8) flows into the surface cooler group to heat the mining working face and the chamber. The heat exchange medium flows into the filling body group through the liquid collector (9).

2. The magnesium-coal-based solid waste filling seasonal energy storage system for mines according to claim 1, characterized in that: The flow rates of the first multi-stage solution pump (21), the second multi-stage solution pump (27), and the third multi-stage solution pump (28) are all 200 kg / s; the lifts of the first multi-stage solution pump (21), the second multi-stage solution pump (27), and the third multi-stage solution pump (28) are all 51 m; the powers of the first multi-stage solution pump (21), the second multi-stage solution pump (27), and the third multi-stage solution pump (28) are all 142 kW; the temperature resistance ranges of the first multi-stage solution pump (21), the second multi-stage solution pump (27), and the third multi-stage solution pump (28) are all -30 degrees Celsius to 100 degrees Celsius; and the corrosion-resistant materials of the first multi-stage solution pump (21), the second multi-stage solution pump (27), and the third multi-stage solution pump (28) are all stainless steel.

3. The magnesium-coal-based solid waste filling seasonal energy storage system for mines according to claim 1, characterized in that: One end of the first multi-stage solution pump (21) is connected to a solution pipeline (33), the top end of the solution pipeline (33) is connected to a water tank (16), and the top of the water tank (16) is threadedly connected to a water tank cover.

4. The magnesium-coal-based solid waste filling seasonal energy storage system for mines according to claim 1, characterized in that: One end of the liquid separator (8) is connected to (26), one end of the (26) is connected to the fifth gas-liquid heat exchanger (14), the liquid outlet end of the fifth gas-liquid heat exchanger (14) is connected to the third multi-stage solution pump (28), and the third multi-stage solution pump (28) is connected to one side of the liquid separator (8).

5. The magnesium-coal-based solid waste filling seasonal energy storage system for mines according to claim 1, characterized in that: The liquid inlet and liquid outlet of the first gas-liquid heat exchanger (10) are connected via a first valve (17), the liquid inlet and liquid outlet of the second gas-liquid heat exchanger (11) are connected via a second valve (18), the liquid inlet and liquid outlet of the third gas-liquid heat exchanger (12) are connected via a third valve (19), and the liquid inlet and liquid outlet of the fourth gas-liquid heat exchanger (13) are connected via a fourth valve (20).

6. The magnesium-coal-based solid waste filling seasonal energy storage system for mines according to claim 1, characterized in that: Rollers are provided at the bottom of the first cooler (29), the second cooler (30), the third cooler (31) and the fourth cooler (32).

7. The magnesium-coal-based solid waste filling seasonal energy storage system for mines according to claim 1, characterized in that: The number of heat exchangers in the gas-liquid heat exchanger group is no less than 5.

8. The magnesium-coal-based solid waste filling seasonal energy storage system for mines according to claim 1, characterized in that: The liquid inlets of the first gas-liquid heat exchanger (10), the second gas-liquid heat exchanger (11), the third gas-liquid heat exchanger (12) and the fourth gas-liquid heat exchanger (13) are all connected to a first liquid inlet pipe (1001); the top end of the first liquid inlet pipe (1001) is connected to a first falling pipe (1002); the bottom end of the first falling pipe (1002) is connected to a first buffer pipe (1003); the top end of the first buffer pipe (1003) is connected to a second falling pipe (1004); the bottom end of the second falling pipe (1004) is connected to a liquid outlet (1005); the liquid outlet (1005) is connected to the liquid outlet; the second falling pipe (1004) and the first falling pipe (1002) are both spiral-shaped.

9. A seasonal energy storage method for magnesium-coal-based solid waste filling bodies used in mines, characterized in that: The steps include: Sp1: In summer, the cold energy stored in the magnesium-coal-based solid waste material (7) cools the heat exchange medium through the heat exchange tube group (36), and the heat exchange medium flows in the solution pipeline (33), which is powered by the multi-stage solution pump group; Sp2: The cooled heat exchange medium is pumped to the liquid distributor (8), and the liquid distributor (8) evenly distributes the heat exchange medium to the first surface cooler (29), the second surface cooler (30), the third surface cooler (31) and the fourth surface cooler (32) in the mining working face or the chamber; Sp3: The first surface cooler (29), the second surface cooler (30), the third surface cooler (31) and the fourth surface cooler (32) use the cold energy of the heat exchange medium to cool down the mining working face or the cavern; Sp4: The heated heat exchange medium returns from the surface cooler group to the liquid collector (9), and the liquid collector (9) collects the heat exchange medium and redistributes it to the heat exchange tube group (36), completing the replacement of cold energy; Sp5: The heat exchange medium circulates in the system, continuously releasing cold energy to maintain a low temperature environment on the working face or in the chamber.

10. A seasonal energy storage method for magnesium-coal-based solid waste filling bodies used in mines according to claim 9, characterized in that: The steps include: Sp6: In winter, the heat energy stored in the magnesium-coal-based solid waste material (7) heats the heat exchange medium through 36, and the heat exchange medium flows in the solution pipeline (33) and is powered by a multi-stage solution pump group; Sp7: The heated heat exchange medium is pumped to the liquid distributor (8), and the liquid distributor (8) evenly distributes the heat exchange medium to the first surface cooler (29), the second surface cooler (30), the third surface cooler (31), the fourth surface cooler (32) and the fifth gas-liquid heat exchanger (14) in the mining working face or the chamber; Sp8: The surface cooler group uses the heat energy of the heat exchange medium to heat the mining working face or the chamber. The heated air circulates in the working face or the chamber to increase the ambient temperature. The fifth gas-liquid heat exchanger (14) uses the heat energy of the heat exchange medium to perform antifreeze treatment on the wellhead. Sp9: The cooled heat exchange medium returns to the liquid separator (8) from the surface cooler group or the fifth gas-liquid heat exchanger (14). The liquid separator (8) collects the heat exchange medium and redistributes it to the heat exchange tube group (36) to complete the replacement of heat energy. Sp10: The heat exchange medium circulates in the system, continuously releasing heat energy, maintaining a high temperature environment at the working face or chamber, and preventing the wellhead from freezing.

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