Mine cooling device and method based on geothermal thermoelectric power generation

Abstract

The invention discloses a mine cooling device and method based on geothermal thermoelectric power generation, and belongs to the technical field of geothermal resource utilization. The mine cooling device based on geothermal temperature difference power generation utilizes surrounding rock heat of a mine high-temperature roadway to generate power through the temperature difference power generation device, the effect of reducing the mine temperature is achieved, meanwhile, heat energy recycling is achieved, the heat energy can be applied to electric equipment in a mine on site through a power generation circuit of the temperature difference power generation module, and the energy consumption is reduced. The electricity utilization cost of electric equipment in the mine is reduced, and meanwhile, the refrigeration cost of mine cooling is also reduced; the problem that an existing mine cooling technology is high in cooling cost is solved. By means of a refrigeration circuit of the thermoelectric power generation module, heat energy in roadway air can be transferred to the roadway wall face so as to guarantee that the temperature of the roadway air is at the proper temperature, and the underground equipment operation and worker operation environment is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of mine cooling, and in particular relates to a mine cooling device and method based on geothermal temperature difference power generation. Background Art

[0002] With the increase in the depth of mineral resource mining, the problem of high geothermal heat damage faced by deep mines is becoming increasingly serious. The initial rock temperature of mines with a mining depth of more than 700 meters mostly exceeds 35°C, and some are close to 50°C. This high geothermal environment not only poses a threat to the health and production efficiency of underground workers, but also affects the safe operation of equipment. According to the "Safety Regulations for Metal and Non-metal Mines" GB16423-2020, the wet-bulb temperature of personnel in continuous working places shall not be higher than 27°C, and work should be stopped when it exceeds 30°C. However, traditional refrigeration and cooling methods are not effective in the treatment of heat damage in deep mines, with high operating costs, low cold utilization rate, and difficult maintenance. With the increase in mining depth, the energy consumed by mine ventilation and air conditioning has increased significantly, resulting in economic problems such as large investment, high cost, and low efficiency in deep mines, which seriously affects the mining cost and sustainable development of deep mineral resources. Heat release from the surrounding rock of the tunnel is the main heat source for the high-temperature thermal environment underground. Controlling heat release from the surrounding rock is an important way to treat heat damage in deep mines.

[0003] In summary, the existing mine cooling technology has the problem of high cooling cost. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a mine cooling device and method based on geothermal temperature difference power generation in view of the deficiencies in the above-mentioned prior art, which has novel and reasonable design, simple structure, strong practicality and is easy to promote and use.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A mine cooling device based on geothermal temperature difference power generation, comprising a temperature difference power generation module arranged in a high-temperature tunnel of a mine, wherein the temperature difference power generation module comprises a protective surface layer in contact with tunnel air, an intermediate functional layer and a bottom bonding layer in contact with the tunnel surrounding rock wall;

[0007] The middle functional layer is connected by a number of neatly arranged thermoelectric power generation sheets. Each horizontal row of thermoelectric power generation sheets is connected in parallel and then in series vertically.

[0008] The positive electrode of the temperature difference power generation module is connected to the positive electrode of the power consumption equipment, and the negative electrode is connected to the negative electrode of the power consumption equipment to form a power generation circuit for realizing temperature difference power generation;

[0009] The positive electrode of the temperature difference power generation module is connected to the positive electrode of the external power supply, and the negative electrode is connected to the negative electrode of the external power supply, forming a refrigeration circuit for realizing the refrigeration of the tunnel air;

[0010] The output voltage of the power generation circuit is expressed by the formula:

[0011] U=α(T h -T c )-I1×R i

[0012] Among them, U is the output voltage, I1 is the output current, R i is the internal resistance of the temperature difference power generation module, α is the Seebeck coefficient, T h and T c are the temperatures of the hot side and the cold side of the thermoelectric generator respectively;

[0013] The cooling capacity of the refrigeration circuit is expressed by the formula:

[0014]

[0015] Among them, Q is the cooling capacity, I2 is the external power supply current, R i is the internal resistance of the temperature difference power generation module, K is the thermal conductivity, α is the Seebeck coefficient, T h and T c are the temperatures of the hot side and the cold side of the thermoelectric generator respectively.

[0016] Furthermore, the bottom bonding layer includes a heat exchange pipeline, which is connected to a domestic water pipeline via a valve, and the valve is opened when heat exchange is required.

[0017] Furthermore, wedge-shaped connecting plates are arranged around the thermoelectric power generation sheets for connecting the thermoelectric power generation sheets, and the connecting plates are made of heat-insulating materials.

[0018] Furthermore, the electrical equipment includes refrigeration equipment, lighting equipment, monitoring equipment and batteries, and the batteries serve as external power sources.

[0019] Furthermore, the thermoelectric power generation sheet is composed of a plurality of thermocouples composed of P-type and N-type semiconductors connected in series, and thermal conductors are arranged on both sides to realize the conversion of temperature difference energy into electrical energy by utilizing the Seebeck effect.

[0020] The present invention also discloses a mine cooling method based on geothermal temperature difference power generation, which is used to control the above-mentioned mine cooling device based on geothermal temperature difference power generation, and the method includes the following steps:

[0021] A plurality of temperature difference power generation modules are used to be arranged on the left and right sides and the top of the high-temperature tunnel of the mine, and the temperature difference power generation modules are divided into a first temperature difference power generation module and a second temperature difference power generation module, and the first temperature difference power generation module and the second temperature difference power generation module are arranged at intervals;

[0022] Detect the tunnel air temperature and the tunnel surrounding rock wall temperature at the first temperature difference power generation module, calculate the temperature difference between the tunnel air and the tunnel surrounding rock wall, and when the temperature difference is ≤ the set temperature difference threshold, control the refrigeration circuit of the first temperature difference power generation module to be closed and the power generation circuit of the second temperature difference power generation module to be closed; when the temperature difference is greater than the set temperature difference threshold, control the power generation circuit of the first temperature difference power generation module to be closed and the refrigeration circuit of the second temperature difference power generation module to be closed. The set temperature difference threshold is in the range of 5°C to 10°C.

[0023] Furthermore, the method also includes: detecting the tunnel surrounding rock wall temperature at the first temperature difference power generation module and the second temperature difference power generation module, when the tunnel surrounding rock wall temperature is greater than the set wall temperature threshold, controlling the valve on the heat exchange pipeline of the corresponding temperature difference power generation module to open, when the tunnel surrounding rock wall temperature is less than or equal to the set wall temperature threshold, controlling the valve on the heat exchange pipeline of the corresponding temperature difference power generation module to close, and the set wall temperature threshold is in the range of 40°C to 80°C.

[0024] Furthermore, the method also includes: detecting the tunnel air temperature at the first thermoelectric power generation module and the second thermoelectric power generation module, when the tunnel air temperature is greater than the set air temperature, controlling the current of the external power supply of the corresponding thermoelectric power generation module to be a first current, and when the tunnel air temperature is less than or equal to the set air temperature, controlling the current of the external power supply of the corresponding thermoelectric power generation module to be a second current; the set air temperature range is 20°C to 50°C, and the first current is greater than the second current.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] The mine cooling device based on geothermal temperature difference power generation of the present invention utilizes the surrounding rock heat of the high-temperature tunnel of the mine to generate electricity through the temperature difference power generation device, which can not only reduce the heat release of the tunnel surrounding rock, but also achieve the effect of reducing the ambient temperature in the tunnel, and also realize the recovery of geothermal energy; through the power generation circuit of the temperature difference power generation module, the electric energy generated by the geothermal temperature difference can be used on-site in the electrical equipment in the mine, reducing the electricity cost of the electrical equipment in the mine, and realizing the utilization of geothermal resources in the mine; utilizing the electric energy generated by the temperature difference of the tunnel surrounding rock and cleverly utilizing the refrigeration function of the temperature difference power generation module, the heat energy in the tunnel air is transferred to the tunnel wall, and the refrigeration power of the temperature difference power generation module is utilized to transfer the heat energy in the tunnel air to the tunnel wall; so as to ensure that the temperature of the tunnel air is at a suitable temperature and improve the working environment of the underground workers. The temperature difference power generation system in the present invention can not only effectively utilize the geothermal energy of the mine, but also realize the effect of heat insulation, can realize low energy consumption, high efficiency to realize the cooling of the mine, improve the underground thermal environment, and overcome the problems of high cost and unsatisfactory cooling effect of the existing cooling method.

[0027] The present invention also discloses a control method for a mine cooling device based on geothermal temperature difference power generation. A plurality of mine cooling devices are arranged in the tunnel, and the mine cooling devices are divided into two categories for separate control. The first mine cooling device is mainly used for temperature difference power generation, and the second mine cooling device is mainly used to reduce the temperature of the tunnel air. Under the ambient temperature of ensuring equipment operation and workers' operation, the temperature difference can be increased to improve the efficiency of power generation. As the power generation circuit continues to generate electricity, the temperature of the tunnel wall decreases accordingly, the corresponding temperature difference decreases, and the power generation efficiency is also reduced. In fact, the deeper part of the tunnel wall still has higher thermal energy; therefore, when the temperature difference is less than or equal to the set temperature difference threshold, the refrigeration circuit of the first mine cooling device is controlled to be closed to complete the work of adjusting the ambient temperature. Since the wall temperature at the second mine cooling device has not been used for power generation, the power generation circuit of the second mine cooling device is closed to generate electricity; when the temperature difference at the first mine cooling device reaches the power generation condition, the refrigeration circuit of the second mine cooling device is controlled to be closed to continue to complete its main work. While improving the power generation efficiency, it can also ensure that the ambient temperature is always within the set range.

[0028] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of a power generation circuit of an embodiment of a mine cooling device based on geothermal temperature difference power generation of the present invention;

[0030] Figure 2 It is a schematic diagram of a refrigeration circuit of an embodiment of a mine cooling device based on geothermal temperature difference power generation of the present invention;

[0031] Figure 3 It is a schematic diagram of the layer structure of the temperature difference power generation sheet of an embodiment of the mine cooling device based on geothermal temperature difference power generation of the present invention;

[0032] Figure 4 It is a schematic structural diagram of the middle functional layer of the temperature difference power generation sheet of an embodiment of the mine cooling device based on geothermal temperature difference power generation of the present invention;

[0033] Figure 5 It is a structural schematic diagram of a temperature difference power generation module of an embodiment of a mine cooling device based on geothermal temperature difference power generation of the present invention;

[0034] Figure 6 It is a schematic diagram of the installation position of the temperature difference power generation module of the embodiment of the mine cooling device based on geothermal temperature difference power generation of the present invention;

[0035] Figure 7 It is a structural schematic diagram of the heat exchange pipeline in the temperature difference power generation module of the mine cooling device based on geothermal temperature difference power generation embodiment of the present invention;

[0036] Figure 8 It is a schematic flow chart of an embodiment of a mine cooling method based on geothermal temperature difference power generation according to the present invention;

[0037] Description of reference numerals:

[0038] 1. Tunnel; 2. Tunnel air; 3. Tunnel surrounding rock wall; 4. Temperature difference power generation module;

[0039] 4-1, first temperature difference power generation module; 4-2, second temperature difference power generation module;

[0040] 5. Thermoelectric power generation sheet; 6. Protective surface layer; 7. Intermediate functional layer; 8. Bottom bonding layer; 9. Heat exchange pipeline; 10. Valve; 11. Electrical conductor; 12. Thermal conductor; 13. Electrical equipment; 14. Connecting plate; 15. Thermocouple. DETAILED DESCRIPTION

[0041] Embodiment of mine cooling method based on geothermal temperature difference power generation:

[0042] like Figure 8 As shown, the mine cooling method based on geothermal temperature difference power generation is used to control the mine cooling device based on geothermal temperature difference power generation.

[0043] like Figure 6 As shown, the mine cooling device based on geothermal temperature difference power generation includes a temperature difference power generation module 4 arranged in the high-temperature tunnel 1 of the mine. Figure 6 As shown, specifically, the temperature difference power generation module 4 includes a protective surface layer 6 in contact with the tunnel air 2, an intermediate functional layer 7, and a bottom bonding layer 8 in contact with the tunnel surrounding rock wall 3. The protective surface layer 6 is in contact with the tunnel air 2 to protect it; the intermediate functional layer 7 is responsible for temperature difference power generation; the bottom bonding layer 8 is in contact with the tunnel surrounding rock wall 3 to utilize the heat of the surrounding rock. This structural design can effectively utilize the temperature difference resources in the mine to generate electricity, while reducing the temperature in the tunnel 1. It solves the problem of high temperature environment in the mine, and achieves the effect of cooling by utilizing geothermal temperature difference to generate electricity.

[0044] like Figure 5 As shown, the middle functional layer 7 is formed by connecting a plurality of neatly arranged thermoelectric power generation sheets 5. Each horizontal row of thermoelectric power generation sheets 5 is connected in parallel and then vertically connected in series. The parallel horizontal rows are then connected in series vertically to increase the voltage. This circuit design improves the efficiency and stability of thermoelectric power generation.

[0045] The thermoelectric power generation sheet 5 is composed of a plurality of thermocouples 15 composed of P-type and N-type semiconductors connected in series, and a thermal conductor 12 is arranged on both sides to realize the conversion of temperature difference energy into electrical energy by using the Seebeck effect. Specifically, the carriers in the P-type semiconductor and the N-type semiconductor are positively charged holes and negatively charged free electrons respectively; under the action of the temperature difference, the positively charged holes and the negatively charged free electrons move in opposite directions, generating opposite voltages in the P-type semiconductor and the N-type semiconductor, thereby generating a thermoelectric electromotive force at the output end, converting the temperature difference into electrical energy output; the output voltage and output power of a single thermocouple 15 are small, so a plurality of thermocouples 15 are connected in series with an electrical conductor 11 to generate electricity. When the current flows from the upper P-type semiconductor end to the N-type semiconductor end, the temperature at the junction of the two semiconductors rises to become a hot end, releasing heat to the surrounding environment, while the temperature at the junction of the lower N pole to the P pole decreases to become a cold end, absorbing heat from the surrounding environment. The refrigeration circuit is designed according to this principle. The electrical conductor 11 is made of bismuth telluride, silicon germanium alloy or lead telluride, and the thermal conductor 12 is made of copper water cooling sheet.

[0046] like Figure 1 As shown, the positive pole of the temperature difference power generation module 4 is connected to the positive pole of the power consumption equipment 13, and the negative pole is connected to the negative pole of the power consumption equipment 13, forming a power generation circuit for realizing temperature difference power generation. The function of supplying the electric energy generated by the temperature difference power generation module 4 to the power consumption equipment 13 is realized by the power generation circuit. The above-mentioned power consumption equipment 13 includes refrigeration equipment, lighting equipment, monitoring equipment and batteries. That is, this electric energy can be directly used in the daily life operations of the mine, or it can be stored first. In order to simplify the device, the battery is used as an external power source. When the battery has no electric energy, other power sources can still be selected as external power sources.

[0047] like Figure 2 As shown, the positive electrode of the temperature difference power generation module 4 is connected to the positive electrode of the external power supply, and the negative electrode is connected to the negative electrode of the external power supply, forming a refrigeration circuit for refrigerating the tunnel air 2, and also realizing heat storage of the tunnel surrounding rock wall 3.

[0048] The output voltage of the above power generation circuit is expressed by the formula:

[0049] U=α(T h -T c )-I1×R i

[0050] Among them, U is the output voltage, I1 is the output current, R i is the internal resistance of the temperature difference power generation module 4, α is the Seebeck coefficient, T h and T c are the temperatures of the hot side and the cold side of the thermoelectric power generation sheet 5 respectively;

[0051] The cooling capacity of the above refrigeration circuit is expressed by the formula:

[0052]

[0053] Among them, Q is the cooling capacity, I2 is the external power supply current, R i is the internal resistance of the temperature difference power generation module 4, K is the thermal conductivity, α is the Seebeck coefficient, T h and T c are the temperatures of the hot side and the cold side of the thermoelectric power generation sheet 5 respectively.

[0054] like Figure 4 As shown, in order to facilitate the inspection of the operating status of the thermoelectric power generation sheet 5 and the replacement of damaged components, the thermoelectric power generation sheet 5 is also surrounded by a wedge-shaped connecting plate 14 for connecting the thermoelectric power generation sheets 5. The connecting plate 14 is made of heat-insulating material.

[0055] like Figure 7 As shown, in order to protect the middle functional layer 7, the bottom bonding layer 8 includes a heat exchange pipeline 9, which is connected to the domestic water pipeline through a valve 10, and the valve 10 is opened when heat exchange is needed. Since heat will tend to gather at the temperature difference power generation module 4 during the temperature difference power generation process, in order to prevent the excessive heat at the tunnel surrounding rock wall 3, a heat exchange pipeline 9 is provided, which can quickly exchange heat, and by opening the valve 10, the heat in the heat exchange pipeline is taken away by the fluid in the exchange pipeline. The fluid heated by heat exchange flows out through the domestic water pipeline and can be used for production and life in the mining area. When heat exchange is not needed, the valve 10 is closed. Although part of the heat of the tunnel surrounding rock wall is exchanged, since the valve 10 is closed, the exchanged heat is not taken away, and the power generation of the temperature difference heat exchange module is not affected; the effect of stabilizing the power generation efficiency is achieved.

[0056] like Figure 8 As shown, the method includes the following steps:

[0057] A plurality of temperature difference power generation modules 4 are used to be arranged on the left and right sides and the top of the high temperature tunnel 1 of the mine to realize temperature difference power generation. The temperature difference power generation module 4 is divided into a first temperature difference power generation module 4-1 and a second temperature difference power generation module 4-2. Figure 7 As shown, the first thermoelectric power generation module 4-1 and the second thermoelectric power generation module 4-2 are arranged at intervals. The interval arrangement means that a plurality of thermoelectric power generation modules 4 are evenly arranged, one is called the first thermoelectric power generation module 4-1, and the thermoelectric power generation module 4 adjacent to the first thermoelectric power generation module 4-1 is called the second thermoelectric power generation module 4-2; the purpose of dividing into the first thermoelectric power generation module 4-1 and the second thermoelectric power generation module 4-2 is to facilitate control, and their internal structures are the same.

[0058] In order to ensure efficient power generation and cooling of the tunnel air 2 at the same time; the temperature of the tunnel air 2 and the temperature of the tunnel surrounding rock wall 3 at the first temperature difference power generation module 4-1 are detected, and the temperature difference between the tunnel air 2 and the tunnel surrounding rock wall 3 is calculated. When the temperature difference is ≤ the set temperature difference threshold, the cooling circuit of the first temperature difference power generation module 4-1 and the power generation circuit of the second temperature difference power generation module 4-2 are controlled to be closed; when the temperature difference is greater than the set temperature difference threshold, the power generation circuit of the first temperature difference power generation module 4-1 and the cooling circuit of the second temperature difference power generation module 4-2 are controlled to be closed. The range of the set temperature difference threshold is 5°C to 10°C. That is, the first thermoelectric power generation module 4-1 is used as the main power generation part, and the second thermoelectric power generation module 4-2 is used as the main cooling part. When the power generation efficiency of the first thermoelectric power generation module 4-1 slows down, it is switched to the cooling state to wait for the heat at the location of the first thermoelectric power generation module 4-1 to gather again to form a higher temperature difference; since the cooling work is now done by the first thermoelectric power generation module 4-1, the second thermoelectric power generation module 4-2, which was originally responsible for cooling, can complete the power generation work; when the temperature difference environment of efficient power generation is reached in the area where the first thermoelectric power generation module 4-1 is located, the second thermoelectric power generation module 4-2 is switched to the cooling state and continues to perform its main duties. This switching control step ensures the efficiency of power generation and the efficiency of cooling.

[0059] In order to ensure the safety of the thermoelectric power generation module 4, the method further includes: detecting the temperature of the tunnel surrounding rock wall 3 at the first thermoelectric power generation module 4-1 and the second thermoelectric power generation module 4-2, and when the temperature of the tunnel surrounding rock wall 3> the set wall temperature threshold, controlling the valve 10 on the heat exchange pipeline 9 of the corresponding thermoelectric power generation module 4 to open; when the temperature of the tunnel surrounding rock wall 3≤the set wall temperature threshold, controlling the valve 10 on the heat exchange pipeline 9 of the corresponding thermoelectric power generation module 4 to close, and the above-mentioned set wall temperature threshold ranges from 40°C to 80°C. That is, when the surrounding rock wall temperature exceeds the set wall temperature threshold, the valve 10 on the heat exchange pipeline 9 of the corresponding thermoelectric power generation module 4 is automatically controlled to open to perform heat exchange and reduce the temperature of the surrounding rock wall. When the surrounding rock wall temperature drops below the set temperature threshold, the valve 10 is closed to stop the heat exchange. This control mechanism can prevent the thermoelectric power generation module 4 from being damaged due to overheating and ensure its safe operation.

[0060] In order to ensure the improvement of refrigeration efficiency, the method also includes: detecting the temperature of the tunnel air 2 at the first thermoelectric power generation module 4-1 and the second thermoelectric power generation module 4-2, when the tunnel air 2 temperature is greater than the set air temperature, controlling the current of the external power supply of the corresponding thermoelectric power generation module 4 to be the first current, when the tunnel air 2 temperature is less than or equal to the set air temperature, controlling the current of the external power supply of the corresponding thermoelectric power generation module 4 to be the second current; the air temperature is set in the range of 20°C to 50°C, and the first current is greater than the second current. That is, when the tunnel air 2 temperature exceeds the set air temperature threshold, the current of the external power supply of the corresponding thermoelectric power generation module 4 is controlled to be a larger current to enhance the refrigeration effect. When the tunnel air 2 temperature drops below the set air temperature, the current of the external power supply is controlled to be a smaller current than the second current to reduce energy consumption. Since the first current is greater than the second current, this adjustment mechanism can adjust the refrigeration intensity according to actual needs, thereby improving the refrigeration efficiency.

[0061] Embodiment of a mine cooling device based on geothermal temperature difference power generation:

[0062] like Figure 1-7 As shown, the mine cooling device based on geothermal temperature difference power generation includes a temperature difference power generation module 4 arranged in the high-temperature tunnel 1 of the mine, and the temperature difference power generation module 4 includes a protective surface layer 6 in contact with the tunnel air 2, an intermediate functional layer 7 and a bottom bonding layer 8 in contact with the tunnel surrounding rock wall 3. The intermediate functional layer 7 is formed by connecting a plurality of neatly arranged temperature difference power generation sheets 5, and each horizontal row of temperature difference power generation sheets 5 is connected in parallel and then vertically connected in series. The positive pole of the temperature difference power generation module 4 is connected to the positive pole of the electrical equipment 13, and the negative pole is connected to the negative pole of the electrical equipment 13, forming a power generation circuit for realizing temperature difference power generation; the positive pole of the temperature difference power generation module 4 is connected to the positive pole of the external power supply, and the negative pole is connected to the negative pole of the external power supply, forming a refrigeration circuit for realizing refrigeration of the tunnel air 2.

[0063] The output voltage of the above power generation circuit is expressed by the formula:

[0064] U=α(T h -T c )-I1×R i

[0065] Among them, U is the output voltage, I1 is the output current, R i is the internal resistance of the temperature difference power generation module 4, α is the Seebeck coefficient, T h and T c are the temperatures of the hot side and the cold side of the thermoelectric power generation sheet 5 respectively;

[0066] The cooling capacity of the above refrigeration circuit is expressed by the formula:

[0067]

[0068] Among them, Q is the cooling capacity, I2 is the external power supply current, R i is the internal resistance of the temperature difference power generation module 4, K is the thermal conductivity, α is the Seebeck coefficient, T h and T c are the temperatures of the hot side and the cold side of the thermoelectric power generation sheet 5 respectively.

[0069] The device uses the temperature difference between the tunnel surrounding rock wall 3 and the tunnel air 2 to convert the mine geothermal energy into electrical energy through the Seebeck effect of thermoelectric materials. The converted electrical energy is used for mine cooling and cooling to improve the underground thermal environment. It not only realizes the effective utilization of geothermal energy in deep mines, but also has a heat insulation effect, reduces the heat released by the high-temperature tunnel surrounding rock into the tunnel 1, and reduces the high-temperature thermal environment underground. In addition, part of the electrical energy generated by the temperature difference in tunnel 1 is used to power underground lighting, gas detection, etc., and the other part of the electrical energy is transmitted to the main air intake tunnel 1 for cooling pre-cooling airflow and airflow waste heat recovery. This technical solution effectively reduces the energy consumption of mine cooling, reduces the cost of mine mining, promotes the development and utilization of geothermal energy in mines, and helps achieve the strategic goal of carbon neutrality.

[0070] This embodiment is implemented with reference to the above-mentioned embodiment of the mine cooling method based on geothermal temperature difference power generation, and will not be described in detail here.

[0071] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A mine cooling device based on geothermal temperature difference power generation, characterized in that: The invention comprises a temperature difference power generation module (4) arranged in a high-temperature tunnel (1) of a mine, wherein the temperature difference power generation module (4) comprises a protective surface layer (6) in contact with tunnel air (2), an intermediate functional layer (7) and a bottom bonding layer (8) in contact with a tunnel surrounding rock wall (3); The middle functional layer (7) is formed by connecting a plurality of neatly arranged thermoelectric power generation sheets (5), and each horizontal row of thermoelectric power generation sheets (5) are connected in parallel and then vertically in series; The positive electrode of the temperature difference power generation module (4) is connected to the positive electrode of the power consumption device (13), and the negative electrode is connected to the negative electrode of the power consumption device (13), so as to form a power generation circuit for realizing temperature difference power generation; The positive electrode of the temperature difference power generation module (4) is connected to the positive electrode of the external power supply, and the negative electrode is connected to the negative electrode of the external power supply, so as to form a refrigeration circuit for realizing refrigeration of the tunnel air (2); The output voltage of the power generation circuit is expressed by the formula: U=α(T h -T c )-I1×R i Among them, U is the output voltage, I1 is the output current, R i is the internal resistance of the temperature difference power generation module (4), α is the Seebeck coefficient, T h and T c are respectively the temperatures of the hot side and the cold side of the thermoelectric generator (5); The cooling capacity of the refrigeration circuit is expressed by the formula: Among them, Q is the cooling capacity, I2 is the external power supply current, R i is the internal resistance of the temperature difference power generation module (4), K is the thermal conductivity, α is the Seebeck coefficient, T h and T c are respectively the temperatures of the hot side and the cold side of the thermoelectric power generation sheet (5).

2. A mine cooling device based on geothermal temperature difference power generation according to claim 1, characterized in that: The bottom bonding layer (8) includes a heat exchange pipeline (9), and the heat exchange pipeline (9) is connected to the domestic water pipeline through a valve (10). The valve (10) is opened when heat exchange is required.

3. A mine cooling device based on geothermal temperature difference power generation according to claim 1, characterized in that: Connecting plates (14) with a wedge-shaped structure are also arranged around the thermoelectric power generation sheets (5) for connecting the thermoelectric power generation sheets (5), and the connecting plates (14) are made of heat-insulating material.

4. A mine cooling device based on geothermal temperature difference power generation according to claim 1, characterized in that: The electrical equipment (13) includes refrigeration equipment, lighting equipment, monitoring equipment and a battery; the battery serves as an external power source.

5. A mine cooling device based on geothermal temperature difference power generation according to claim 1, characterized in that: The thermoelectric power generation sheet (5) is composed of a plurality of thermocouples (15) formed of P-type and N-type semiconductors connected in series, and thermal conductors (12) are arranged on both sides to realize the conversion of temperature difference energy into electrical energy by utilizing the Seebeck effect.

6. A mine cooling method based on geothermal temperature difference power generation, characterized in that: The method is used to control the mine cooling device based on geothermal temperature difference power generation according to any one of claims 1 to 5, and the method comprises the following steps: A plurality of temperature difference power generation modules (4) are used to be arranged on the left and right sides and the top of a high-temperature tunnel (1) in a mine, wherein the temperature difference power generation modules (4) are divided into a first temperature difference power generation module (4-1) and a second temperature difference power generation module (4-2), and the first temperature difference power generation module (4-1) and the second temperature difference power generation module (4-2) are arranged at intervals; The tunnel air (2) temperature and the tunnel surrounding rock wall (3) temperature at the first temperature difference power generation module (4-1) are detected, and the temperature difference between the tunnel air (2) and the tunnel surrounding rock wall (3) is calculated. When the temperature difference is less than or equal to a set temperature difference threshold, the cooling circuit of the first temperature difference power generation module (4-1) is controlled to be closed and the power generation circuit of the second temperature difference power generation module (4-2) is controlled to be closed. When the temperature difference is greater than the set temperature difference threshold, the power generation circuit of the first temperature difference power generation module (4-1) is controlled to be closed and the cooling circuit of the second temperature difference power generation module (4-2) is controlled to be closed. The set temperature difference threshold is in the range of 5°C to 10°C.

7. A mine cooling method based on geothermal temperature difference power generation according to claim 6, characterized in that: The method further comprises: detecting the temperature of the tunnel surrounding rock wall (3) at the first temperature difference power generation module (4-1) and the second temperature difference power generation module (4-2); when the tunnel surrounding rock wall (3) temperature is greater than a set wall temperature threshold, controlling the valve (10) on the heat exchange pipeline (9) of the corresponding temperature difference power generation module (4) to open; and when the tunnel surrounding rock wall (3) temperature is less than or equal to the set wall temperature threshold, controlling the valve (10) on the heat exchange pipeline (9) of the corresponding temperature difference power generation module (4) to close, wherein the set wall temperature threshold is in the range of 40°C to 80°C.

8. A mine cooling method based on geothermal temperature difference power generation according to claim 6, characterized in that: The method further comprises: detecting the temperature of the tunnel air (2) at the first temperature difference power generation module (4-1) and the second temperature difference power generation module (4-2); when the tunnel air (2) temperature is greater than the set air temperature, controlling the current of the external power supply corresponding to the temperature difference power generation module (4) to be a first current; and when the tunnel air (1) temperature is less than or equal to the set air temperature, controlling the current of the external power supply corresponding to the temperature difference power generation module (4) to be a second current; The set air temperature ranges from 20° C. to 50° C., and the first current is greater than the second current.

Images