Heat dissipation and cooling system for high-temperature mine

Abstract

The utility model discloses a heat dissipation cooling system for a high-temperature mine, which comprises a front-end refrigeration unit, a middle-section refrigeration unit, an air supply pipe, a plurality of groups of cooling units, a liquid supply pipe and a circulating pipe, the front-end refrigeration unit is arranged on the ground surface, the middle-section refrigeration unit is arranged on the middle-rear section of the mine, and the liquid supply pipe is arranged in the middle-rear section of the mine. The cooling units are arranged in mining areas of the rear section of a mine and attached to the inner wall of the mine, the front-end refrigeration unit is sequentially connected with the middle-section refrigeration unit and the cooling units through air supply pipes, and the middle-section refrigeration unit is further connected with a cold source through a liquid supply pipe and a circulating pipe. The device is compact in layout in a mine, small in occupied area, stable in ventilation and high in air quality, the air temperature in the mine is always kept below 30 DEG C, the problem of heat damage can be effectively solved, the production operation environment is improved, and the occupational health of underground mine operation personnel is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of underground mining ventilation technology, and in particular relates to a heat dissipation and cooling system for high-temperature mines. Background Technology

[0002] As shallow mineral resources are gradually depleted, mining will inevitably shift to deeper levels to meet the demands of industrial production. With increasing mining depth and intensity, the underground working environment becomes more complex due to factors such as heat dissipation from the surrounding rock, directly impacting mine production and safety management. Subtropical regions (Yunnan, Guangdong, etc.) typically have higher surface temperatures than other areas. The average temperature of fresh air entering the mine from the surface is 32℃ from March to October, reaching as high as 40℃ from May to August. Even air transported to the mining site using conventional methods remains above 30℃. Furthermore, due to geothermal anomalies and rock heat volatilization during deep mining, the temperature gradually increases with increasing mine depth (the geothermal gradient can reach up to 3.1℃ / 100 meters). Under the interaction of temperature and humidity, the airflow temperature in many areas of the middle and later sections of the mine still exceeds 32℃, and the humidity reaches over 85%, resulting in severe heat damage on site. This seriously affects the working environment and health of workers, reduces work efficiency, and increases the risk of safety accidents. Therefore, simply increasing the air intake volume is insufficient to meet the cooling requirements; researching ways to reduce the temperature of the system's intake air source is particularly important. Utility Model Content

[0003] The present invention provides a heat dissipation and cooling system for high-temperature mines.

[0004] This utility model is achieved through the following technical solution: it includes a front-end refrigeration unit, a middle-section refrigeration unit, a supply air duct, a cooling unit, a liquid supply pipe, and a circulation pipe. The front-end refrigeration unit is located on the ground surface, the middle-section refrigeration unit is located in the middle and rear sections of the mine, and there are multiple sets of cooling units. Each cooling unit is located in a mining area in the rear section of the mine and is attached to the inner wall of the mine. The front-end refrigeration unit is connected to the middle-section refrigeration unit and the cooling unit in sequence through the supply air duct. The middle-section refrigeration unit is also connected to a cold source through the liquid supply pipe and the circulation pipe. The cooling unit includes a cooling pipe, an air outlet, and a connecting pipe. The cooling pipe is arranged in an inverted U-shape. There are several cooling pipes. One end of each cooling pipe is sealed, and the other end is connected to the adjacent cooling pipe through the connecting pipe. The cooling pipe at the outermost edge is connected to the supply air duct. An air outlet is provided on the inner side of each cooling pipe.

[0005] Furthermore, the mid-section refrigeration unit includes a shell, partitions, heat exchange tubes, and heat dissipation fins. The heat exchange tubes are coaxially arranged in the shell, with both ends of the heat exchange tubes passing through the shell and connecting to the supply air ducts. Partitions are axially symmetrically arranged on both sides of the heat exchange tubes and connected to the inner wall of the shell. The partitions divide the internal space of the shell into an upper heat dissipation cavity and a lower heat dissipation cavity, with either end of the upper heat dissipation cavity communicating with the lower heat dissipation cavity, forming a U-shaped connection. An inlet is provided at the top of the shell of the upper heat dissipation cavity, away from the communicating end, and connected to the supply pipe. An outlet is provided at the bottom of the shell of the lower heat dissipation cavity, opposite to the inlet, and connected to the circulation pipe. There are several heat dissipation fins, which are axially evenly arranged on the heat exchange tubes in the upper and lower heat dissipation cavities, with each end of the heat dissipation fins having a gap from the end of the shell.

[0006] The beneficial effects of this utility model are: the equipment has a compact layout in the mine, occupies a small area, has stable ventilation and high air quality. By cooling the transported gas in multiple stages, the cooling effect is improved, and the gas is dried. While reducing the temperature in the mine, it can also remove water vapor from the mine air, reduce the water content in the air, effectively solve the problem of heat hazards, improve the production and working environment, and protect the occupational health of underground mine workers.

[0007] On the other hand, the distribution density of cooling units in the mine can be customized according to the depth of the mine, thereby better controlling the cooling and heat dissipation effect and air humidity in the mine, and keeping the air temperature in the mine below 30 degrees Celsius. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model;

[0009] Figure 2 This is a schematic diagram of the cooling unit.

[0010] Figure 3 This is a schematic diagram of the middle section refrigeration unit;

[0011] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of AA;

[0012] Numbering in the diagram: 1~Front-end refrigeration unit, 2~Air compressor, 3~Air cooler, 4~Dryer, 5~Cold source, 6~Middle-section refrigeration unit, 7~Shell, 8~Baffle plate, 9~Heat exchange tube, 10~Heat dissipation fins, 11~Upper heat dissipation cavity, 12~Lower heat dissipation cavity, 13~Liquid supply pipe, 14~Circulation pipe, 15~Supply air duct, 16~Cooling unit, 17~Cooling pipe, 18~Air outlet, 19~Connecting pipe, 20~Liquid pump, 21~Blower, 22~Temperature and humidity sensor, 23~Exhaust fan, 24~Exhaust duct, 25~Control device, 26~Secondary heat sink. Detailed Implementation

[0013] To enable those skilled in the art to better understand the technical solution of this utility model, the specific embodiments are described in detail below with reference to the accompanying drawings.

[0014] like Figures 1-4 The heat dissipation and cooling system for high-temperature mines shown includes a front-end refrigeration unit 1, a middle-section refrigeration unit 6, a supply air duct 15, a cooling unit 16, a liquid supply pipe 13, and a circulation pipe 14. The front-end refrigeration unit 1 is located on the surface, and the middle-section refrigeration unit 6 is located in the middle and rear sections of the mine. There are multiple sets of cooling units 16, each located in a mining area in the rear section of the mine and attached to the inner wall of the mine. The front-end refrigeration unit 1 is connected to the middle-section refrigeration unit 6 and the cooling unit 16 in sequence through the supply air duct 15. The middle-section refrigeration unit 6 is also connected to a cold source 5 (cold source 5 is low-temperature or normal-temperature water) through the liquid supply pipe 13 and the circulation pipe 14. To ensure the normal use of the cold source 5, a cooling tower can be built to cool the high-temperature water output from the circulation pipe 14, ensuring that the liquid supply pipe 13 is always... The cold source 5 supplies heat exchange fluid to each intermediate refrigeration unit 6 through the liquid supply pipe 13 (supplying normal temperature or low temperature water). The cooling unit 16 includes a cooling pipe 17, an air outlet 18, and a connecting pipe 19. The cooling pipe 17 is arranged in an inverted U-shape. There are several cooling pipes 17. One end of each cooling pipe 17 is sealed, and the other end is connected to the adjacent cooling pipe 17 by the connecting pipe 19. The cooling pipe 17 at the outermost edge is connected to the supply air pipe 15. An air outlet 18 is provided on the inner side of each cooling pipe 17. After the low temperature gas enters each cooling pipe 17 from the supply air pipe 15, it is blown out into the mine from the air outlets 18 at the bottom, middle, top and top of the cooling pipe 17, so that the low temperature gas can quickly and more evenly contact the gas in the mine for heat exchange and cooling.

[0015] The front-end refrigeration unit 1 includes an air compressor 2, an air cooler 3, and a dryer 4. The compressor is connected to the air cooler 3 and the dryer 4 in sequence through pipes. The air cooler 3 is connected to a cold source 5 through pipes, so that the cold source 5 provides heat exchange fluid for refrigeration to the air cooler 3. The dryer 4 is connected to a supply duct 15. The air compressor 2 is used to draw room temperature air from the natural environment and compress it to a certain degree, and then supply it to the air cooler 3. The air cooler 3 cools the gas to make it a low-temperature gas. Then the dryer 4 dries the low-temperature gas to remove water vapor (by appropriately replacing or neutralizing water vapor by inputting dry low-temperature gas, the problem of high humidity in the mine can be alleviated, and the dryness and comfort can be improved). Finally, the dried low-temperature gas is transported to the cooling unit 16 of each mining area through the supply duct 15, and the low-temperature gas is discharged into the mine for cooling through the cooling unit 16.

[0016] The intermediate cooling unit 6 is mounted on the mine surface via a bracket or directly installed on the mine surface. The intermediate cooling unit 6 includes a shell 7, partitions 8, heat exchange tubes 9, and heat dissipation fins 10. The heat exchange tubes 9 are coaxially arranged within the shell 7, with both ends of the heat exchange tubes 9 extending out of the shell 7 and connecting to the supply air duct 15. Partitions 8 are axially symmetrically arranged on both sides of the heat exchange tubes 9, connecting to the inner wall of the shell 7. The partitions 8 divide the internal space of the shell 7 into an upper heat dissipation cavity 11 and a lower heat dissipation cavity 12, with either end of the upper heat dissipation cavity 11 connected to the lower heat dissipation cavity 12, forming a U-shaped connection. The upper heat dissipation cavity 11, located away from the connected end, is located on the top of the shell 7. The upper heat dissipation chamber 11 and the lower heat dissipation chamber 12 are respectively provided with a liquid inlet connected to the liquid supply pipe 13. The lower heat dissipation chamber 12 is provided with a liquid outlet connected to the circulation pipe 14 at the bottom of the shell 7. There are several heat dissipation fins 10, which are axially evenly arranged on the heat exchange pipes 9 in the upper heat dissipation chamber 11 and the lower heat dissipation chamber 12. The ends of the heat dissipation fins 10 are respectively separated from the ends of the shell 7. Since the temperature in the mine is higher than the ambient temperature, it will absorb heat and rise in temperature during transportation. Therefore, a mid-section refrigeration unit 6 is selectively set in the mine to perform secondary cooling of the low temperature gas, so that the gas arriving at the mining area is always kept at a low temperature, thereby achieving a good cooling and heat dissipation effect.

[0017] The heat exchange fluid of the cold source 5 enters the upper heat dissipation chamber 11 through the supply pipe 13 to contact the heat exchange tube 9 and the heat dissipation fins 10 on its upper part, and then enters the lower heat dissipation chamber 12 to contact the heat exchange tube 9 and the heat dissipation fins 10 on its lower part. This process cools the gas passing through the heat exchange tube 9 a second time, ensuring that the gas delivered to the mine is always kept at a low temperature. The heat exchange fluid after heat exchange is then transported back to the cold source 5 through the circulation pipe 14 for recycling.

[0018] Each of the supply pipe 13 and circulation pipe 14 is equipped with at least one liquid pump 20. Depending on the depth of the mine, liquid pumps 20 are selectively installed on the supply pipe 13 and circulation pipe 14, employing multi-stage pumping to ensure normal supply and circulation of the heat exchange fluid. This avoids insufficient pressure due to increased mine depth or length, preventing unstable or inadequate heat exchange fluid supply. During installation and use, to prevent heat exchange fluid backflow, one-way valves are installed at the connections between the supply pipe 13, circulation pipe 14, and the air cooler 3 and intermediate refrigeration unit 6.

[0019] The middle and / or rear sections of the supply air duct 15 are equipped with blowers 21. Depending on the depth of the mine, blowers 21 are selectively installed on the supply air duct 15 to ensure that low-temperature gas can be quickly delivered to various areas of the mine, thereby ensuring the stability and continuity of the mine cooling operation. An electric control valve is provided between the supply air duct 15 and each cooling unit 16 to control and adjust the supply amount.

[0020] A cooling unit 16 is provided in the middle section of the mine. Several cooling units 16 are set according to the cooling requirements. Each cooling unit 16 is connected to a supply air pipe 15, and an electric control valve is provided between the two to control the amount of gas supplied to the corresponding cooling unit 16, so as to avoid the temperature in the middle section of the mine being too high and to keep it at a normal temperature.

[0021] It also includes a temperature and humidity sensor 22, which is installed in the middle section of the mine, the rear section of the mine and each mining area. The temperature and humidity sensor 22 is electrically connected to the control device 25. The temperature and humidity sensor 22 detects the temperature and humidity changes in the middle section of the mine, the rear section of the mine and each mining area in real time, and feeds them back to the control device 25. Then, the management personnel decide on the amount of gas supplied based on the temperature and humidity changes.

[0022] It also includes exhaust fans 23 and exhaust pipes 24. The exhaust fans 23 are located on the surface, in the middle section of the mine, in the rear section of the mine, and in each mining area. The exhaust fans 23 are located on the lower part of the mine sidewall or on the ground to achieve better exhaust effect (gas containing dust and water vapor is heavy, so it sinks to the lower part of the mine, while the newly introduced dry gas is relatively light and will be in the upper part of the mine. The suction of hot and humid gas creates negative pressure in the lower part of the mine, and the dry gas moves rapidly downward due to the negative pressure to replenish the lower part of the mine, further improving the cooling and dehumidification effect). The exhaust pipes 24 are set along the mine and connected to each exhaust fan 23. The exhaust fans 23 are used to extract hot and humid or high-temperature gas in the mine, as well as water vapor, dust and other substances generated during the mining process, and discharge them from the mine. Together with the dry and low-temperature gas supplied into the mine by the air supply pipes 15, they form a gas ventilation circulation to improve the ventilation effect.

[0023] During installation and use, the lengths of the air supply duct 15, liquid supply duct 13, circulation duct 14, and exhaust duct 24 are increased or decreased according to the depth or length of the mine. As the depth or length of the mine increases, the number of temperature and humidity sensors 22, blowers 21, liquid pumps 20, exhaust fans 23, intermediate cooling units 6, and cooling units 16 are increased accordingly to ensure stable and continuous operation of ventilation, heat dissipation, and cooling, and to avoid insufficient gas supply leading to poor ventilation and cooling.

[0024] The control device 25 is an industrial computer or PLC programmable logic controller with a built-in display. The control device 25 is electrically connected to the temperature and humidity sensor 22, electric control valve, blower 21, liquid pump 20, exhaust fan 23, air compressor 2, air cooler 3, and dryer 4. The management personnel can control the operating status of the above equipment through the control device 25.

[0025] The inner circumference of the heat exchange tube 9 is provided with several auxiliary heat dissipation fins 26 arranged along its axial direction. Each auxiliary heat dissipation fin 26 is in the shape of a straight plate or S-shape. The auxiliary heat dissipation fins 26 increase the contact surface with the gas and improve the heat exchange and cooling effect.

Claims

1. A heat dissipation and cooling system for high-temperature mines, comprising a front-end refrigeration unit (1), a middle-section refrigeration unit (6), a supply air duct (15), a cooling unit (16), a liquid supply pipe (13), and a circulation pipe (14), characterized in that: The front-end refrigeration unit (1) is located on the ground surface, the middle-section refrigeration unit (6) is located in the middle and rear sections of the mine, and there are multiple sets of cooling units (16). Each cooling unit (16) is located in a mining area in the rear section of the mine and is attached to the inner wall of the mine. The front-end refrigeration unit (1) is connected to the middle-section refrigeration unit (6) and the cooling unit (16) in sequence through the supply air pipe (15). The middle-section refrigeration unit (6) is also connected to the cold source (5) through the liquid supply pipe (13) and the circulation pipe (14). In the cooling unit (16), the cooling tube (17), the air outlet (18), and the connecting pipe (19) are provided. The cooling tube (17) is arranged in an inverted U-shaped structure. There are several cooling tubes (17). One end of each cooling tube (17) is sealed, and the other end is connected to the adjacent cooling tube (17) by the connecting pipe (19). The cooling tube (17) at the outermost edge is connected to the air supply pipe (15). An air outlet (18) is provided on the inner side of each cooling tube (17).

2. The heat dissipation and cooling system for high-temperature mines according to claim 1, characterized in that: The front-end refrigeration unit (1) includes an air compressor (2), an air cooler (3) and a dryer (4). The compressor is connected to the air cooler (3) and the dryer (4) in sequence through pipes, and the dryer (4) is connected to the supply air duct (15).

3. The heat dissipation and cooling system for high-temperature mines according to claim 1, characterized in that: The mid-section refrigeration unit (6) includes a shell (7), a partition (8), a heat exchange tube (9), and heat dissipation fins (10). The heat exchange tube (9) is coaxially disposed in the shell (7), and both ends of the heat exchange tube (9) pass through the shell (7) and connect to the supply air duct (15). The partition (8) is axially symmetrically arranged on both sides of the heat exchange tube (9) and connects to the inner wall of the shell (7). The partition (8) divides the internal space of the shell (7) into an upper heat dissipation cavity (11) and a lower heat dissipation cavity (12), and any end of the upper heat dissipation cavity (11) is connected to the lower heat dissipation cavity (12). 2) Connect the two to form a U-shaped structure. An inlet is provided on the top of the shell (7) of the upper heat dissipation cavity (11) away from the connected end to connect the liquid supply pipe (13). An outlet is provided on the bottom of the shell (7) of the lower heat dissipation cavity (12) opposite to the inlet to connect the circulation pipe (14). There are several heat dissipation fins (10). The heat dissipation fins (10) are axially evenly arranged on the heat exchange pipes (9) in the upper heat dissipation cavity (11) and the lower heat dissipation cavity (12). The ends of the heat dissipation fins (10) are respectively spaced from the ends of the shell (7).

4. The heat dissipation and cooling system for high-temperature mines according to claim 1 or 3, characterized in that: The liquid supply pipe (13) and circulation pipe (14) are each equipped with at least one liquid pump (20).

5. The heat dissipation and cooling system for high-temperature mines according to claim 1, characterized in that: The middle and / or rear sections of the supply air duct (15) are equipped with a blower (21), and an electric control valve is provided between the supply air duct (15) and each cooling unit (16).

6. The heat dissipating cooling system for high temperature mines of claim 1, wherein: A cooling unit (16) is provided in the middle section of the mine. The cooling unit (16) is connected to the supply air pipe (15), and an electric control valve is provided between the two.

7. The heat dissipation and cooling system for high-temperature mines according to claim 1, characterized in that: It also includes a temperature and humidity sensor (22), which is installed in the middle section of the mine, the rear section of the mine and each mining area. The temperature and humidity sensor (22) is electrically connected to the control device (25).

8. The heat dissipating cooling system for high temperature mines of claim 1, wherein: It also includes exhaust fans (23) and exhaust pipes (24). The exhaust fans (23) are located on the ground surface, in the middle section of the mine, in the rear section of the mine and in each mining area. The exhaust pipes (24) are installed along the mine and connected to each exhaust fan (23).

Images