High-temperature mine cooling system and method utilizing top and bottom plate aquifer closed circulation

Abstract

The invention belongs to the technical field of mine heat damage treatment, and particularly relates to a high-temperature mine cooling system and method utilizing top and bottom plate aquifer closed circulation, and the high-temperature mine cooling system comprises a cooling mechanism arranged on the inner wall of a roadway; the heat exchange mechanism is communicated with the roadway cooling mechanism; the cold water circulation mechanism is communicated with the roof low-temperature aquifer, and the cold water circulation mechanism is communicated with the heat exchange mechanism; and the hot water circulating mechanism is communicated with the bottom plate high-temperature water-bearing layer, and the hot water circulating mechanism is communicated with the heat exchange mechanism. The cooling mechanism absorbs heat in the roadway and transmits the heat to the heat exchange mechanism, the cold water circulation mechanism and the hot water circulation mechanism conduct heat exchange with the heat exchange mechanism at the same time, secondary cooling of the cooling mechanism is achieved, and the cooling effect is better. Cold water and hot water circularly flow in the top plate low-temperature water-containing layer and the bottom plate high-temperature water-containing layer respectively, so that underground water pollution caused by sewage is avoided; the underground water is used for cooling the heat-conducting medium, energy consumption is reduced, and the operation cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of mine heat damage control, and in particular relates to a high-temperature mine cooling system and method utilizing closed circulation of roof and floor aquifers. Background Art

[0002] With the increasing mining depth of coal and metal mines, the problem of high-temperature heat damage underground is becoming increasingly prominent. The geothermal gradient in deep mines typically reaches 3°C-5°C per 100m. When mining depth exceeds 800m, the ambient temperature at the working face can reach over 35°C, posing a serious threat to miners' health and reducing production efficiency. It also significantly increases energy consumption for ventilation and artificial cooling. Currently, mine cooling mainly relies on mechanical refrigeration systems (such as compression refrigeration units) or mine water circulation cooling. However, traditional refrigeration equipment suffers from high energy consumption and high operating costs. In particular, in high-heat-load mines, cooling efficiency decreases significantly with increasing temperature. Open cooling systems directly discharge high-temperature mine water, leading to water resource waste and shallow groundwater pollution. Existing technologies are difficult to cope with the non-steady-state thermal environment of deep mines, especially when there is a significant temperature difference between the roof and floor rock strata, which prevents the full utilization of natural cooling sources. In recent years, although ground-source heat pump technology and mine water heat exchange systems have been tried for mine cooling, they still cannot meet the cooling needs of deep, high-temperature tunnels.

[0003] Therefore, a high-temperature mine cooling system and method using closed circulation of roof and floor aquifers is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-temperature mine cooling system and method using closed circulation of roof and floor aquifers to solve the above problems.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A high-temperature mine cooling system utilizing closed circulation of roof and floor aquifers comprises:

[0007] A cooling mechanism is provided on the inner wall of the tunnel, and a heat-conducting medium circulates in the cooling mechanism;

[0008] a heat exchange mechanism, connected to the cooling mechanism;

[0009] A cold water circulation mechanism is connected to the low-temperature aquifer on the top plate, and the cold water circulation mechanism is connected to the heat exchange mechanism;

[0010] The hot water circulation mechanism is communicated with the high-temperature aquifer on the bottom plate, and the hot water circulation mechanism is communicated with the heat exchange mechanism.

[0011] Preferably, the cooling mechanism includes:

[0012] A cooling pipe is arranged on the inner wall of the tunnel, and the cooling pipe is arranged in an S shape;

[0013] The second water pump is provided on the cooling pipe, and is used for driving the heat transfer medium in the cooling pipe to circulate.

[0014] Preferably, the heat exchange mechanism comprises:

[0015] A low-temperature heat exchanger is provided on the cooling pipe, wherein the cooling pipe is connected to a high-temperature water inlet and a low-temperature water outlet of the low-temperature heat exchanger;

[0016] An evaporator is provided on the cooling pipe, and the cooling pipe is connected to a high-temperature water inlet and a low-temperature water outlet of the evaporator;

[0017] a compressor, an inlet of which is in communication with a heat exchange medium outlet of the evaporator;

[0018] A condenser, wherein a heat exchange medium inlet is connected to the heat exchange medium outlet of the compressor, and the condenser is connected to the hot water circulation mechanism;

[0019] An electronic expansion valve has an inlet connected to the heat exchange medium outlet of the condenser, and an outlet of the electronic expansion valve is connected to the heat exchange medium inlet of the evaporator.

[0020] Preferably, the cold water circulation mechanism includes:

[0021] A low-temperature water collection module, the top end of which penetrates into the low-temperature aquifer on the roof;

[0022] a first water pump, wherein the water inlet is connected to the low-temperature water collection module, and the water outlet of the first water pump is connected to the low-temperature water inlet of the low-temperature heat exchanger;

[0023] The bottom end of the low-temperature water outlet pipeline is connected to the high-temperature water outlet of the low-temperature water outlet pipeline, and the top end of the low-temperature water outlet pipeline penetrates into the roof low-temperature aquifer.

[0024] Preferably, the hot water circulation mechanism includes:

[0025] A high-temperature water inlet pipe, the bottom end of which penetrates into the high-temperature aquifer of the bottom plate;

[0026] a third water pump, whose water inlet is connected to the top of the high-temperature water inlet pipeline, and whose water outlet is connected to the low-temperature water inlet of the condenser;

[0027] The top of the high-temperature water outlet pipeline is connected to the high-temperature water outlet of the condenser, and the bottom end of the high-temperature water outlet pipeline penetrates into the high-temperature aquifer of the bottom plate.

[0028] Preferably, a filter is fixedly mounted on the low-temperature water collection module, the pore size of the filter is no more than 1 mm, and the filter is located in the top plate low-temperature aquifer.

[0029] Preferably, a high-temperature ceramic filter is fixedly installed on the high-temperature water inlet pipeline, the operating temperature of the high-temperature ceramic filter is not lower than 80° C., and the high-temperature ceramic filter is located in the high-temperature aquifer on the bottom plate.

[0030] Preferably, a first temperature sensor is provided at the inlet end of the third water pump, and an evaporator water inlet temperature sensor and an evaporator water outlet temperature sensor are provided at the high-temperature water inlet and the low-temperature water outlet of the evaporator respectively. The evaporator water inlet temperature sensor, the evaporator water outlet temperature sensor and the first temperature sensor are all electrically connected to the controller, and the controller is electrically connected to the third water pump, the first water pump, the second water pump, the compressor and the electronic expansion valve.

[0031] Preferably, an electric regulating valve is provided at the inlet end of the third water pump, and the electric regulating valve is electrically connected to the controller.

[0032] A high-temperature mine cooling method using closed circulation of roof and floor aquifers is provided. Based on the high-temperature mine cooling system using closed circulation of roof and floor aquifers, the steps are as follows:

[0033] The heat-conducting medium circulates in the cooling mechanism, absorbing the heat in the tunnel through the heat-conducting medium;

[0034] The cold water in the roof low-temperature aquifer is extracted through the cold water circulation mechanism, and the heat transfer medium is cooled once through the heat exchange mechanism, and the heat flows into the roof low-temperature aquifer along with the water flow;

[0035] The hot water in the bottom plate high temperature aquifer is extracted through the hot water circulation mechanism, and the heat transfer medium is cooled for a second time through the heat exchange mechanism, and the heat enters the bottom plate high temperature aquifer along with the water flow.

[0036] Compared with the prior art, the present invention has the following advantages and technical effects:

[0037] In the present invention, the cooling mechanism absorbs the heat in the tunnel and transfers the heat to the heat exchange mechanism, and heat exchange occurs with the heat exchange mechanism at the same time through the cold water circulation mechanism and the hot water circulation mechanism, and the heat in the heat exchange mechanism is transferred to the low-temperature aquifer on the top plate and the high-temperature aquifer on the bottom plate, thereby achieving secondary cooling of the cooling mechanism and achieving better cooling effect; cold water and hot water circulate in the low-temperature aquifer on the top plate and the high-temperature aquifer on the bottom plate respectively, and no sewage is generated to cause groundwater pollution; groundwater is used to exchange heat with the heat-conducting medium, thereby reducing energy consumption and reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0039] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 Schematic diagram of the internal structure of the present invention;

[0041] Figure 3 This is a connection diagram of the evaporator in the present invention;

[0042] Figure 4 This is a connection diagram of the third water pump in the present invention;

[0043] Figure 5 It is the system principle diagram of the present invention;

[0044] Among them, 1. Roof low-temperature aquifer; 2. Roof rock layer; 3. Bottom rock layer; 4. Bottom high-temperature aquifer; 5. Low-temperature water collection module; 6. Low-temperature water outlet pipeline; 7. Filter; 8. Low-temperature heat exchanger; 9. First water pump; 10. Cooling pipe; 11. Second water pump; 12. Third water pump; 13. High-temperature water inlet pipeline; 14. High-temperature water outlet pipeline; 15. High-temperature ceramic filter; 16. Evaporator; 17. Compressor; 18. Condenser; 19. Electronic expansion valve; 20. Controller; 21. Evaporator inlet temperature sensor; 22. Evaporator outlet temperature sensor; 23. Electric regulating valve; 24. First temperature sensor. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] Reference Figures 1 to 5 The present invention discloses a high-temperature mine cooling system utilizing a closed circulation of roof and floor aquifers, comprising:

[0048] The cooling mechanism is arranged on the inner wall of the tunnel, and the heat conducting medium circulates in the cooling mechanism;

[0049] a heat exchange mechanism, connected to the cooling mechanism;

[0050] The cold water circulation mechanism is connected to the low-temperature aquifer 1 on the top plate, and the cold water circulation mechanism is connected to the heat exchange mechanism;

[0051] The hot water circulation mechanism is communicated with the bottom plate high-temperature aquifer 4, and the hot water circulation mechanism is communicated with the heat exchange mechanism.

[0052] In the present invention, the cooling mechanism absorbs the heat in the tunnel and transfers the heat to the heat exchange mechanism. The cold water circulation mechanism and the hot water circulation mechanism simultaneously exchange heat with the heat exchange mechanism, and the heat in the heat exchange mechanism is transferred to the top plate low-temperature aquifer 1 and the bottom plate high-temperature aquifer 4, thereby realizing secondary cooling of the cooling mechanism and achieving better cooling effect; cold water and hot water circulate in the top plate low-temperature aquifer 1 and the bottom plate high-temperature aquifer 4 respectively, and no sewage is generated to cause groundwater pollution; groundwater is used to exchange heat with the heat-conducting medium, thereby reducing energy consumption and reducing operating costs.

[0053] To further optimize the solution, the cooling mechanism includes:

[0054] The cooling pipe 10 is arranged on the inner wall of the tunnel and is arranged in an S shape;

[0055] The cooling tube 10 is made of high thermal conductivity and corrosion-resistant stainless steel;

[0056] The second water pump 11 is provided on the cooling pipe 10 , and is used to drive the heat transfer medium in the cooling pipe 10 to circulate.

[0057] Further optimization scheme, the heat exchange mechanism includes:

[0058] The low-temperature heat exchanger 8 is provided on a cooling pipe 10, and the cooling pipe 10 is connected to the high-temperature water inlet and the low-temperature water outlet of the low-temperature heat exchanger 8;

[0059] The evaporator 16 is provided on the cooling pipe 10, and the cooling pipe 10 is connected to the high-temperature water inlet and the low-temperature water outlet of the evaporator 16;

[0060] The compressor 17, the inlet of which is connected to the heat exchange medium outlet of the evaporator 16;

[0061] The heat exchange medium inlet of the condenser 18 is connected to the heat exchange medium outlet of the compressor 17, and the condenser 18 is connected to the hot water circulation mechanism;

[0062] The inlet of the electronic expansion valve 19 is communicated with the heat exchange medium outlet of the condenser 18 , and the outlet of the electronic expansion valve 19 is communicated with the heat exchange medium inlet of the evaporator 16 .

[0063] To further optimize the solution, the cold water circulation mechanism includes:

[0064] The top of the low-temperature water collection module 5 penetrates into the roof low-temperature aquifer 1;

[0065] The first water pump 9 has a water inlet connected to the low-temperature water collection module 5, and a water outlet connected to the low-temperature water inlet of the low-temperature heat exchanger 8;

[0066] The bottom end of the low-temperature water outlet pipe 6 is connected to the high-temperature water outlet of the low-temperature water outlet pipe 6 , and the top end of the low-temperature water outlet pipe 6 penetrates into the roof low-temperature aquifer 1 .

[0067] To further optimize the solution, the hot water circulation mechanism includes:

[0068] The high-temperature water inlet pipe 13 has its bottom end penetrated into the bottom plate high-temperature aquifer 4;

[0069] The water inlet of the third water pump 12 is connected to the top of the high-temperature water inlet pipe 13, and the water outlet of the third water pump 12 is connected to the low-temperature water inlet of the condenser 18;

[0070] The top end of the high-temperature water outlet pipe 14 is connected to the high-temperature water outlet of the condenser 18 , and the bottom end of the high-temperature water outlet pipe 14 penetrates into the bottom plate high-temperature aquifer 4 .

[0071] To further optimize the solution, a filter 7 is fixedly installed on the low-temperature water collection module 5 , the pore size of the filter 7 is no more than 1 mm, and the filter 7 is located in the top plate low-temperature aquifer 1 .

[0072] To further optimize the solution, a high-temperature ceramic filter 15 is fixedly installed on the high-temperature water inlet pipe 13. The working temperature of the high-temperature ceramic filter 15 is not lower than 80°C, and the high-temperature ceramic filter 15 is located in the high-temperature aquifer 4 on the bottom plate.

[0073] To further optimize the solution, a first temperature sensor 24 is provided at the inlet end of the third water pump 12, and an evaporator water inlet temperature sensor 21 and an evaporator water outlet temperature sensor 22 are respectively provided at the high-temperature water inlet and the low-temperature water outlet of the evaporator 16. The evaporator water inlet temperature sensor 21, the evaporator water outlet temperature sensor 22 and the first temperature sensor 24 are all electrically connected to the controller 20, and the controller 20 is electrically connected to the third water pump 12, the first water pump 9, the second water pump 11, the compressor 17 and the electronic expansion valve 19.

[0074] As a further optimization solution, an electric regulating valve 23 is provided at the inlet end of the third water pump 12 , and the electric regulating valve 23 is electrically connected to the controller 20 .

[0075] A high-temperature mine cooling method using a closed circulation system of roof and floor aquifers is provided. The steps are as follows:

[0076] The heat-conducting medium circulates in the cooling mechanism, absorbing the heat in the tunnel through the heat-conducting medium;

[0077] The cold water in the roof low-temperature aquifer 1 is extracted through the cold water circulation mechanism, and the heat transfer medium is cooled once through the heat exchange mechanism, and the heat flows into the roof low-temperature aquifer 1 along with the water flow;

[0078] The hot water in the bottom plate high temperature aquifer 4 is extracted through the hot water circulation mechanism, and the heat transfer medium is cooled down for the second time through the heat exchange mechanism, and the heat flows into the bottom plate high temperature aquifer 4 along with the water flow.

[0079] Working process:

[0080] The top of the low-temperature water collection module 5 and the low-temperature water outlet pipeline 6 pass through the roof rock layer 2 and are located in the roof low-temperature aquifer 1. The low-temperature water collection module 5 is connected to the water inlet of the first water pump 9. The water outlet of the first water pump 9 is connected to the low-temperature water inlet of the low-temperature heat exchanger 8. The low-temperature water outlet pipeline 6 is connected to the high-temperature water outlet of the low-temperature heat exchanger 8. The high-temperature water inlet and low-temperature water outlet of the low-temperature heat exchanger 8 are both connected to the cooling pipe 10.

[0081] The bottom ends of the high-temperature water inlet pipeline 13 and the high-temperature water outlet pipeline 14 both pass through the bottom rock layer 3 and are located in the bottom high-temperature aquifer 4. The high-temperature water inlet pipeline 13 is connected to the water inlet of the third water pump 12. The water outlet of the third water pump 12 is connected to the low-temperature water inlet of the evaporator 16. The high-temperature water outlet of the evaporator 16 is connected to the high-temperature water outlet pipeline 14. The cooling pipe 10 is connected to the high-temperature water inlet and the low-temperature water outlet of the evaporator 16. The heat exchange medium inlet of the evaporator 16 is connected to the electronic expansion valve 19. The inlet of the electronic expansion valve 19 is connected to the heat exchange medium outlet of the condenser 18. The inlet of the condenser 18 is connected to the heat exchange medium outlet of the compressor 17. The inlet of the compressor 17 is connected to the heat exchange medium outlet of the evaporator 16.

[0082] When working, the second water pump 11 drives the heat transfer medium to circulate in the cooling pipe 10, the low-temperature heat exchanger 8 and the evaporator 16, absorbs the heat in the tunnel, and transfers the heat to the low-temperature heat exchanger 8 and the evaporator 16;

[0083] The first water pump 9 pumps the low-temperature water in the roof low-temperature aquifer 1 into the low-temperature heat exchanger 8, and exchanges heat with the heat-conducting medium in the low-temperature heat exchanger 8. The high-temperature water after heat exchange is returned to the roof low-temperature aquifer 1 through the low-temperature water outlet pipe 6;

[0084] The third water pump 12 draws hot water from the bottom plate high-temperature aquifer 4 into the condenser 18 and exchanges heat with the heat-conducting medium in the condenser 18. The high-temperature water after heat exchange returns to the bottom plate high-temperature aquifer 4 through the high-temperature water outlet pipe 14.

[0085] The heat exchange medium circulates in the evaporator 16, the compressor 17, the condenser 18, and the electronic expansion valve 19. The heat exchange medium evaporates in the evaporator 16 and absorbs heat, absorbing the heat of the heat-conducting medium in the cooling tube 10. The heat exchange medium then flows into the compressor 17, where it is compressed into a high-temperature, high-pressure gas and flows to the condenser 18. The heat exchange medium condenses in the condenser 18 and releases heat to the hot water in the high-temperature aquifer 4 on the bottom plate. The heat exchange medium then passes through the electronic expansion valve 19 and enters the evaporator 16, completing one cycle.

[0086] In addition, the third water pump 12 is used to accelerate the circulation speed of the hot water in the bottom plate high-temperature aquifer 4 in the high-temperature water outlet pipe 14, the condenser 18 and the high-temperature water inlet pipe 13, thereby accelerating the heat efficiency of the hot water in the bottom plate high-temperature aquifer 4 absorbing the refrigerant in the condenser 18.

[0087] The third water pump 12 is a variable frequency water pump, and the water pressure at the outlet of the third water pump 12 is 2.5 MPa;

[0088] The detection data of the evaporator water inlet temperature sensor 21, the evaporator water outlet temperature sensor 22 and the first temperature sensor 24 are obtained through the PLC controller 20, and the speed of the third water pump 16 is adjusted through the PID algorithm, the opening of the electric regulating valve 20 is adjusted, and the electronic expansion valve 19 is adjusted to achieve automatic optimization of the system parameters.

[0089] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, 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 cannot be understood as a limitation on the present invention.

[0090] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A high-temperature mine cooling system using a closed circulation of roof and floor aquifers, characterized in that: include: A cooling mechanism is provided on the inner wall of the tunnel, and a heat-conducting medium circulates in the cooling mechanism; a heat exchange mechanism, connected to the cooling mechanism; A cold water circulation mechanism is connected to the top plate low-temperature water-bearing layer (1), and the cold water circulation mechanism is connected to the heat exchange mechanism; The hot water circulation mechanism is in communication with the bottom plate high-temperature water-containing layer (4), and the hot water circulation mechanism is in communication with the heat exchange mechanism.

2. A high-temperature mine cooling system utilizing closed circulation of roof and floor aquifers according to claim 1, characterized in that: The cooling mechanism comprises: A cooling pipe (10) is arranged on the inner wall of the tunnel, and the cooling pipe (10) is arranged in an S shape; A second water pump (11) is provided on the cooling pipe (10), and the second water pump (11) is used to drive the heat-conducting medium in the cooling pipe (10) to circulate.

3. A high-temperature mine cooling system utilizing closed circulation of roof and floor aquifers according to claim 2, characterized in that: The heat exchange mechanism comprises: A low-temperature heat exchanger (8) is arranged on the cooling pipe (10), and the cooling pipe (10) is connected to the high-temperature water inlet and the low-temperature water outlet of the low-temperature heat exchanger (8); An evaporator (16) is arranged on the cooling pipe (10), and the cooling pipe (10) is connected to a high-temperature water inlet and a low-temperature water outlet of the evaporator (16); a compressor (17), an inlet of which is in communication with a heat exchange medium outlet of the evaporator (16); A condenser (18), a heat exchange medium inlet of which is in communication with a heat exchange medium outlet of the compressor (17), and the condenser (18) is in communication with the hot water circulation mechanism; The electronic expansion valve (19) has an inlet connected to the heat exchange medium outlet of the condenser (18), and an outlet of the electronic expansion valve (19) is connected to the heat exchange medium inlet of the evaporator (16).

4. A high-temperature mine cooling system utilizing closed circulation of roof and floor aquifers according to claim 3, characterized in that: The cold water circulation mechanism comprises: A low-temperature water collection module (5), the top end of which penetrates into the roof low-temperature aquifer (1); a first water pump (9), the water inlet of which is in communication with the low-temperature water collection module (5), and the water outlet of which is in communication with the low-temperature water inlet of the low-temperature heat exchanger (8); The bottom end of the low-temperature water outlet pipe (6) is connected to the high-temperature water outlet of the low-temperature water outlet pipe (6), and the top end of the low-temperature water outlet pipe (6) penetrates into the top plate low-temperature aquifer (1).

5. A high-temperature mine cooling system utilizing closed circulation of roof and floor aquifers according to claim 4, characterized in that: The hot water circulation mechanism comprises: A high-temperature water inlet pipe (13), the bottom end of which penetrates into the bottom plate high-temperature aquifer (4); a third water pump (12), the water inlet of which is in communication with the top end of the high-temperature water inlet pipe (13), and the water outlet of which is in communication with the low-temperature water inlet of the condenser (18); The top end of the high-temperature water outlet pipe (14) is connected to the high-temperature water outlet of the condenser (18), and the bottom end of the high-temperature water outlet pipe (14) penetrates into the bottom plate high-temperature water-bearing layer (4).

6. A high-temperature mine cooling system utilizing closed circulation of roof and floor aquifers according to claim 4, characterized in that: A filter (7) is fixedly mounted on the low-temperature water collection module (5); the pore size of the filter (7) is no greater than 1 mm; and the filter (7) is located within the top plate low-temperature water-bearing layer (1).

7. The high-temperature mine cooling system using closed circulation of roof and floor aquifers according to claim 5 is characterized in that: A high-temperature ceramic filter (15) is fixedly installed on the high-temperature water inlet pipeline (13). The operating temperature of the high-temperature ceramic filter (15) is not less than 80° C. The high-temperature ceramic filter (15) is located in the bottom plate high-temperature water-bearing layer (4).

8. The high-temperature mine cooling system using closed circulation of roof and floor aquifers according to claim 5 is characterized in that: The inlet end of the third water pump (12) is provided with a first temperature sensor (24), and the high-temperature water inlet and the low-temperature water outlet of the evaporator (16) are respectively provided with an evaporator water inlet temperature sensor (21) and an evaporator water outlet temperature sensor (22), the evaporator water inlet temperature sensor (21), the evaporator water outlet temperature sensor (22) and the first temperature sensor (24) are all electrically connected to a controller (20), and the controller (20) is electrically connected to the third water pump (12), the first water pump (9), the second water pump (11), the compressor (17) and the electronic expansion valve (19).

9. A high-temperature mine cooling system utilizing closed circulation of roof and floor aquifers according to claim 8, characterized in that: An electric regulating valve (23) is provided at the inlet end of the third water pump (12), and the electric regulating valve (23) is electrically connected to the controller (20).

10. A high-temperature mine cooling method using closed circulation of roof and floor aquifers, based on the high-temperature mine cooling system using closed circulation of roof and floor aquifers according to any one of claims 1 to 9, characterized in that: Here are the steps: The heat-conducting medium circulates in the cooling mechanism, absorbing the heat in the tunnel through the heat-conducting medium; The cold water in the top plate low-temperature aquifer (1) is extracted through the cold water circulation mechanism, and the heat transfer medium is cooled once through the heat exchange mechanism, and the heat enters the top plate low-temperature aquifer (1) along with the water flow; Hot water is extracted from the bottom plate high-temperature aquifer (4) through a hot water circulation mechanism, and the heat transfer medium is cooled for a second time through a heat exchange mechanism, and the heat flows into the bottom plate high-temperature aquifer (4) along with the water flow.

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