Underground cooling system

Abstract

The utility model belongs to the technical field of underground cooling, and particularly discloses an underground cooling system. The underground cooling system comprises a ground cooling assembly and an underground cooling assembly; the ground cooling assembly comprises an air compressor, a liquefaction part and a main storage tank which are connected in sequence; the underground cooling assembly comprises a main conveying pipeline, a branch storage tank and a gasifier which are sequentially connected, an inlet of the main conveying pipeline is connected with an outlet of the main storage tank, and an outlet of the gasifier is communicated with the working face. According to the underground cooling system, the reliability and the safety of underground cooling can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of underground cooling, and particularly relates to an underground cooling system. Background Technique

[0002] With the gradual increase of deep well mining, the problems brought by high temperature in deep wells are more prominent. In related technologies, cooling is achieved by increasing the air volume, using heat insulation materials, etc. However, due to the high temperature underground and the long transportation distance, a large amount of air volume is required, and the reliability of cooling by using the cooling methods in related technologies is poor. Summary of the Invention

[0003] The utility model aims to solve at least one of the technical problems in related technologies to a certain extent. For this purpose, an embodiment of the utility model provides an underground cooling system, which can improve the reliability and safety of underground cooling.

[0004] The underground cooling system of the embodiment of the utility model includes: a ground cooling component, which includes an air compressor, a liquefaction component and a main storage tank connected in sequence; an underground cooling component, which includes a main transmission pipeline, a sub-storage tank and a vaporizer connected in sequence. The inlet of the main transmission pipeline is connected to the outlet of the main storage tank, and the outlet of the vaporizer is communicated with the working face.

[0005] In this embodiment, the bottom surface cooling component includes an air compressor, a liquefaction component and a main storage tank connected in sequence. First, the air is compressed by the air compressor, and then the compressed air is liquefied by the liquefaction component. After the liquefied air is transported to the main storage tank, it is then transported to the sub-storage tank through a pipeline. The liquefied air in the sub-storage tank is vaporized by the vaporizer, and the vaporized air can be used to cool the working face. In this embodiment, by setting the main storage tank and the sub-storage tank to store a certain amount of liquefied air, it is beneficial to the stable operation of the system. In addition, by forming liquid air through the ground cooling component and transporting it underground, compared with transporting cooling air, the energy consumption can be reduced, the transportation process is more stable and reliable, which is beneficial to improving the safety of underground work and can also reduce the equipment maintenance cost.

[0006] In this embodiment, the ground cooling component further includes an air pre-cooling component. The air inlet of the air pre-cooling component is connected to the outlet of the air compressor, and the air outlet of the air pre-cooling component is connected to the inlet of the liquefaction component.

[0007] In this embodiment, the pre-cooling component includes an air cooling tower and a chilled water unit. The air inlet of the air cooling tower is connected to the outlet of the air compressor, the air outlet of the air cooling tower is connected to the inlet of the liquefaction component, the water outlet of the chilled water unit is connected to the water inlet of the air cooling tower, and the water outlet of the air cooling tower is connected to the water inlet of the chilled water unit.

[0008] In this embodiment, the ground cooling assembly further includes an air purification component. The inlet of the air purification component is connected to the outlet of the air pre-cooling component, and the outlet of the air purification component is connected to the inlet of the liquefaction component.

[0009] In this embodiment, the air purification component includes a molecular sieve adsorber. The inlet of the molecular sieve adsorber is connected to the outlet of the air pre-cooling component, and the outlet of the molecular sieve adsorber is connected to the inlet of the liquefaction component.

[0010] In this embodiment, the ground cooling assembly further includes an air filter. The inlet of the air filter is in communication with the external air, and the outlet of the air filter is connected to the inlet of the air compressor.

[0011] In this embodiment, the liquefaction component includes a booster fan, a first cooler, a turboexpander, a second cooler, and a heat exchanger connected in sequence. The inlet of the booster fan is connected to the outlet of the air compressor. The hot medium inlet of the heat exchanger is connected to the outlet of the first cooler. The hot medium outlet of the heat exchanger is connected to the main storage tank. And the cold medium inlet of the heat exchanger is connected to the outlet of the second cooler, and the cold medium outlet of the heat exchanger is connected to the inlet of the turboexpander.

[0012] In this embodiment, the downhole cooling assembly further includes a power generation component. The power generation component includes a steam turbine and a generator. The power source of the steam turbine is the gas output by the vaporizer, and the generator is connected to the steam turbine.

[0013] In this embodiment, the downhole cooling assembly further includes an air cooling member. The water inlet of the air cooling member is connected to the water outlet of the vaporizer, and the water outlet of the air cooling member is connected to the water return port of the vaporizer.

[0014] In this embodiment, the main storage tank has a heat insulation layer;

[0015] And / or, the sub-storage tank has a heat insulation layer. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the downhole cooling system according to an embodiment of the present invention.

[0017] Figure 2 is a schematic diagram of the liquefaction system according to an embodiment of the present invention.

[0018] Figure 3 is a schematic diagram of the downhole cooling assembly after removing the main delivery pipeline according to an embodiment of the present invention.

[0019] Reference Numerals:

[0020] 1. Ground cooling component; 11. Air filter; 12. Air compressor; 13. Air pre-cooling component; 131. Air cooling tower; 132. Chiller; 14. Air purification component; 15. Liquefaction component; 151. Booster fan; 152. First cooler; 153. Turboexpander; 154. Second cooler; 155. Heat exchanger; 16. Main storage tank;

[0021] 2. Downhole cooling component; 21. Main conveying pipeline; 22. Sub-storage tank; 23. Vaporizer; 24. Power generation component; 241. Steam turbine; 25. Air cooling part. Detailed implementation manner

[0022] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0023] As Figure 1 shown, the downhole cooling system in this embodiment includes a ground cooling component 1 and a downhole cooling component 2. The ground cooling component 1 includes an air compressor 12, a liquefaction component 15, and a main storage tank 16 connected in sequence; the downhole cooling component 2 includes a main conveying pipeline 21, a sub-storage tank 22, and a vaporizer 23 connected in sequence. The inlet of the main conveying pipeline 21 is connected to the outlet of the main storage tank 16, and the outlet of the vaporizer 23 is communicated with the working face.

[0024] Specifically, the ground cooling component 1 is arranged on the ground, and the downhole cooling component 2 is arranged underground.

[0025] The air compressor 12 can adopt a centrifugal air compressor 12, and the centrifugal air compressor 12 can continuously output compressed air, and is energy-saving and efficient. Of course, the air compressor 12 can also adopt other forms, which are not limited herein. In addition, the air compressor 12 is also configured with intermediate and final coolers to absorb the heat released by the air compressor 12. The setting method of the cooler is a conventional prior art and is not limited herein.

[0026] The processing capacity of the liquefaction component 15 can be converted in combination with the actual situation of deep shaft mines (for example, heat loads such as heat release of underground surrounding rocks, heat dissipation in the downhole cooling system, heat dissipation from rock blasting, and heat release of groundwater, as well as heat absorption of humid air released by the surrounding rocks). Therefore, the specifications, parameters, etc. of each part of the ground cooling component 1 and the downhole cooling component 2 can be selected according to actual needs, which are not limited herein.

[0027] The main conveying pipeline 21 can be arranged in the auxiliary shaft of the mine, or can be set through a borehole. The diameter of the main conveying pipeline 21 can be DN100mm - DN159mm. The main conveying pipeline 21 is made of heat-insulating material, which is beneficial to the stable transportation of liquid air.

[0028] For example, multiple sub-storage tanks 22 and vaporizers 23 can be provided. Specifically, sub-storage tanks 22 and vaporizers 23 can be arranged in each roadway that needs to be cooled underground. The sub-storage tanks 22 and vaporizers 23 in each roadway are interconnected. The sub-storage tanks 22 at each working face are all connected to the main conveying pipeline 21, so as to facilitate the cooling of each working face that needs to be cooled. The specific number of sub-storage tanks 22 and vaporizers 23 can be set according to needs and will not be limited here.

[0029] It can be understood that the bottom surface cooling component in this embodiment includes an air compressor 12, a liquefaction component 15 and a main storage tank 16 connected in sequence. First, the air compressor 12 compresses the air, and then the liquefaction component 15 liquefies the compressed air. After the liquefied air is transported to the main storage tank 16, it is then transported to the sub-storage tank 22 through a pipeline. The liquefied air in the sub-storage tank 22 is vaporized by the vaporizer 23, and the vaporized air can be used to cool the working face. In this embodiment, by setting the main storage tank 16 and the sub-storage tank 22 to store a certain amount of liquefied air, it is beneficial to the stable operation of the system. In addition, by using the ground cooling component 1 to form liquid air and transport it underground, compared with transporting cooling air, it can reduce energy consumption, the transportation process is more stable and reliable, which is beneficial to improving the safety of underground work and can also reduce the equipment maintenance cost.

[0030] In this embodiment, as Figure 1 shown, the ground cooling component 1 further includes an air filter 11. The inlet of the air filter 11 is communicated with the external air, and the outlet of the air filter 11 is connected to the inlet of the air compressor 12.

[0031] For example, the air filter 11 can adopt a self-cleaning air filter 11. The self-cleaning air filter 11 has a high filtration efficiency, can effectively filter the tiny particles in the air, ensure the air quality, and has an automatic ash cleaning function, which can protect the subsequent air compressor 12 to operate normally and is beneficial to extending the service life of the air compressor 12.

[0032] In this embodiment, by setting the air filter 11, the dust and impurities in the air can be removed, which is beneficial to improving the air quality of the cooling gas transported to the working face, improving the working environment, enhancing the safety of the staff during work, and can also reduce the damage to the subsequent equipment caused by the dust and impurities in the air.

[0033] In this embodiment, as Figure 1As shown, the ground cooling component 1 further includes an air pre-cooling component 13. The air inlet of the air pre-cooling component 13 is connected to the outlet of the air compressor 12, and the air outlet of the air pre-cooling component 13 is connected to the inlet of the liquefaction component 15.

[0034] It can be understood that by setting the air pre-cooling component 13 to pre-cool the air compressed by the air compressor 12, the impact on downstream equipment caused by the relatively high-temperature air can be reduced, which is beneficial to improving the service life of downstream equipment. In addition, by pre-cooling the air to lower its temperature, it is beneficial to reduce the energy required for the liquefaction process, thereby reducing energy consumption and improving efficiency.

[0035] In this embodiment, the pre-cooling component 13 includes an air-cooling tower 131 and a chiller 132. The air inlet of the air-cooling tower 131 is connected to the outlet of the air compressor 12, the air outlet of the air-cooling tower 131 is connected to the inlet of the liquefaction component 15, the water outlet of the chiller 132 is connected to the water inlet of the air-cooling tower 131, and the water outlet of the air-cooling tower 131 is connected to the water inlet of the chiller 132.

[0036] Specifically, as Figure 1 shown, the air-cooling tower 131 is provided with an air inlet and an air outlet on its tower body. The air inlet of the air-cooling tower 131 is arranged on the side of the tower body, and the air outlet of the air-cooling tower 131 is arranged at the top of the tower body. The chiller 132 is used to supply chilled water into the air-cooling tower 131. A spray head is arranged in the air-cooling tower 131, and the chilled water is sprayed downward from the top inside the tower body of the air-cooling tower 131 through the spray head, so as to cool the air entering the tower body and remove some particles and some chemical impurities in the air at the same time, further improving the air quality. The chiller 132 is a conventional existing technology, and its specific structure and working principle will not be elaborated here.

[0037] The pre-cooling component in this embodiment is the air-cooling tower 131, which can remove some particles and some chemical impurities in the air while cooling the air, thereby improving the air quality.

[0038] In this embodiment, as Figure 1 shown, the ground cooling component 1 further includes an air purification component 14. The inlet of the air purification component 14 is connected to the outlet of the air pre-cooling component 13, and the outlet of the air purification component 14 is connected to the inlet of the liquefaction component 15.

[0039] It should be noted that by setting the air purification component 14 to purify the air, dust, harmful gases (such as carbon monoxide) and other pollutants can be removed, the working environment can be improved, the air quality can be ensured to meet safety standards, which is beneficial to protecting the health of staff. It can also reduce the combustible content, lower the explosion risk, and improve the safety of mine operations.

[0040] In this embodiment, the air purification component 14 includes a molecular sieve adsorber. The inlet of the molecular sieve adsorber is connected to the outlet of the air precooling component 13, and the outlet of the molecular sieve adsorber is connected to the inlet of the liquefaction component 15.

[0041] Specifically, multiple molecular sieve adsorbers can be provided. The inlet of one molecular sieve adsorber among the multiple molecular sieve adsorbers is connected to the outlet of the air precooling component 13, and the outlet is connected to the inlet of the liquefaction component 15, while the other molecular sieve adsorbers are regenerated. After long-term use, the molecular sieve adsorber will lose its ability to continue adsorption due to adsorption saturation. The role of regeneration is to restore the adsorption capacity of the adsorbent so that it can continue to effectively perform the adsorption operation. By setting multiple molecular sieve adsorbers to work alternately, the air can be continuously purified.

[0042] It can be understood that the molecular sieve adsorber can effectively remove water vapor, carbon dioxide, hydrocarbons, etc. in the air, which is beneficial to ensuring the mine safety standards. Moreover, the molecular sieve adsorber has high adsorption capacity and long-cycle regeneration cycle, with relatively low long-term operating costs and reduced frequency of replacing filter materials.

[0043] In this embodiment, as Figure 1 and Figure 2 shown, the liquefaction component 15 includes a booster fan 151, a first cooler 152, a turboexpander 153, a second cooler 154, and a heat exchanger 155 connected in sequence. The inlet of the booster fan is connected to the outlet of the air compressor 12. The hot medium inlet of the heat exchanger 155 is connected to the outlet of the first cooler 152, the hot medium outlet of the heat exchanger 155 is connected to the main storage tank 16, and the cold medium inlet of the heat exchanger 155 is connected to the outlet of the second cooler 154, and the cold medium outlet of the heat exchanger 155 is connected to the inlet of the turboexpander 153.

[0044] The air pressurized by the booster fan 151 is divided into two paths after passing through the first cooler 152. One path is connected to the hot medium inlet of the heat exchanger 155, liquefies after passing through the heat exchanger 155, and flows from the hot medium outlet to the main storage tank 16. The other path sequentially passes through the turboexpander 153 and the second cooler 154 and flows to the cold medium inlet of the heat exchanger 155. After heat exchange in the heat exchanger 155, it flows out from the cold medium outlet and then flows back to the turboexpander 153 for circulation. The air enters the turboexpander 153 and passes through a series of moving blades and stationary blades inside the turboexpander 153. When the high-pressure gas flows through the moving blades, the gas expands and accelerates due to the pressure drop, and the internal energy is converted into kinetic energy, driving the blades to rotate. The temperature of the gas will also decrease accordingly. At the same time, the volume of the gas increases, and the temperature naturally drops. The air output through the turboexpander 153 has its temperature recovered after heat exchange through the heat exchanger 155, and can be cooled again after passing through the turboexpander 153, thus continuously circulating, so that the air in the hot medium pipeline passing through the heat exchanger 155 forms a liquid through heat exchange. In addition, by setting the first cooler 152 and the second cooler 154 to cool the air entering the heat exchanger 155, it is beneficial to improve the working efficiency of the heat exchanger 155. The heat in the liquefaction component 15 can be taken out by an external cooling device. The specific setting method of the cooling device is conventional prior art and will not be elaborated here.

[0045] In this embodiment, as Figure 1 and Figure 3 shown, the downhole temperature reduction assembly 2 further includes a power generation component 24. The power generation component 24 includes a steam turbine 241 and a generator. The power source of the steam turbine 241 is the gas output by the vaporizer 23, and the generator is connected to the steam turbine 241.

[0046] It should be noted that after the liquid air enters the vaporizer 23, it forms high-pressure and low-temperature gas. The high-pressure and low-temperature gas drives the generator to generate electricity through the steam turbine 241, and the electric energy can be recycled. After the air undergoes kinetic energy conversion, the pressure drops to atmospheric pressure and is released into the roadway, mixing with the original air in the mine, thereby cooling the roadway. The working principles of the steam turbine 241 and the generator are conventional prior art and will not be elaborated here.

[0047] In this embodiment, the downhole temperature reduction assembly 2 further includes an air cooling member 25. The water inlet of the air cooling member 25 is connected to the water outlet of the vaporizer 23, and the water outlet of the air cooling member 25 is connected to the water return port of the vaporizer 23.

[0048] For example, the air cooling member 25 can be an air cooler or a local fan. By setting the air cooler or the local fan, the working face can be better cooled.

[0049] It can be understood that the cooling water formed by the phase change of the liquid air in the vaporizer 23 is transported to the air cooling member 25 to cool the working surface. After the air cooling member 25 heats up the cooling water, it continues to be used for the phase change of the liquid air in the vaporizer 23, forming a water cycle utilization, which is beneficial to saving resources and reducing energy consumption.

[0050] In this embodiment, the main storage tank 16 has a heat insulation layer. Specifically, the main storage tank 16 can be a double-layer structure, and expanded perlite is filled in the interlayer for heat insulation. Expanded perlite has excellent heat insulation effect and stability. The sub-storage tank 22 has a heat insulation layer. Similarly, the sub-storage tank 22 can also be a double-layer structure, and expanded perlite is filled in the interlayer for heat insulation.

[0051] When the downhole cooling system of this embodiment works, the gaseous air is filtered through the air filter 11 in sequence, compressed by the air compressor 12, then precooled by the precooling component 13. The precooled gaseous air enters the purification component 14 to purify the air and remove harmful gases, and then the compressed air is liquefied by the liquefaction component 15. After the liquefied air is transported to the main storage tank 16, the liquefied air is transported to the sub-storage tank 22 through the main pipeline 21. The liquefied air in the sub-storage tank 22 is vaporized by the vaporizer 23, and the vaporized air can be used to cool the working surface. In this embodiment, by setting the main storage tank 16 and the sub-storage tank 22 to store a certain amount of liquefied air, it is beneficial to the stable operation of the system. In addition, by forming liquid air through the ground cooling assembly 1 and transporting it to the underground, compared with transporting cooling air, it can reduce energy consumption, the transportation process is more stable and reliable, which is beneficial to improving the safety of underground work, and can also reduce the equipment maintenance cost. After the liquid air passes through the vaporizer 23, it forms a high-pressure and low-temperature gas. The downhole cooling assembly 2 further includes a power generation component 24. The steam turbine 241 of the power generation component 24 drives the generator to generate electricity. It can not only recover and use the electric energy, but also reduce the pressure of the air to atmospheric pressure and release it into the underground roadway after kinetic energy conversion to achieve the cooling effect on the underground.

[0052] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and 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.

[0053] Furthermore, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0054] In the present utility model, unless otherwise clearly stipulated and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0055] In the present utility model, unless otherwise clearly stipulated and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0056] In the present utility model, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0057] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A downhole temperature reduction system, characterized in that, Comprising: A ground cooling assembly, which includes an air compressor, a liquefaction component, and a main storage tank connected in sequence; A downhole cooling assembly, which includes a main delivery pipeline, a sub-storage tank, and a vaporizer connected in sequence. The inlet of the main delivery pipeline is connected to the outlet of the main storage tank, and the outlet of the vaporizer is communicated with the working face.

2. The downhole temperature reduction system according to claim 1, characterized in that, The ground cooling assembly further includes an air precooling component. The air inlet of the air precooling component is connected to the outlet of the air compressor, and the air outlet of the air precooling component is connected to the inlet of the liquefaction component.

3. The downhole temperature reduction system according to claim 2, wherein, The precooling component includes an air cooling tower and a chiller. The air inlet of the air cooling tower is connected to the outlet of the air compressor, the air outlet of the air cooling tower is connected to the inlet of the liquefaction component, the water outlet of the chiller is connected to the water inlet of the air cooling tower, and the water outlet of the air cooling tower is connected to the water inlet of the chiller.

4. The downhole temperature reduction system according to claim 2, characterized in that, The ground cooling assembly further includes an air purification component. The inlet of the air purification component is connected to the outlet of the air precooling component, and the outlet of the air purification component is connected to the inlet of the liquefaction component.

5. The downhole temperature reduction system according to claim 4, characterized in that, The air purification component includes a molecular sieve adsorber. The inlet of the molecular sieve adsorber is connected to the outlet of the air precooling component, and the outlet of the molecular sieve adsorber is connected to the inlet of the liquefaction component.

6. The downhole temperature reduction system according to claim 1, characterized in that The ground cooling assembly further includes an air filter. The inlet of the air filter is communicated with the external air, and the outlet of the air filter is connected to the inlet of the air compressor.

7. The downhole temperature reduction system according to claim 1, characterized in that, The liquefaction component includes a booster fan, a first cooler, a turbo-expander, a second cooler, and a heat exchanger connected in sequence. The inlet of the booster fan is connected to the outlet of the air compressor. The heat medium inlet of the heat exchanger is connected to the outlet of the first cooler, the heat medium outlet of the heat exchanger is connected to the main storage tank, and the cold medium inlet of the heat exchanger is connected to the outlet of the second cooler, and the cold medium outlet of the heat exchanger is connected to the inlet of the turbo-expander.

8. The downhole temperature reduction system according to claim 1, characterized in that, The downhole cooling assembly further includes a power generation component, which includes a steam turbine and a generator. The power source of the steam turbine is the gas output by the vaporizer, and the generator is connected to the steam turbine.

9. The downhole temperature reduction system according to claim 1, wherein The downhole cooling assembly further includes an air cooling member. The water inlet of the air cooling member is connected to the water outlet of the vaporizer, and the water outlet of the air cooling member is connected to the water return port of the vaporizer.

10. The downhole temperature reduction system according to any one of claims 1 to 9, characterized in that, The main storage tank has a heat-insulating layer; And / or, the sub-storage tank has a heat-insulating layer.

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