A centralized refrigeration and cooling system and method for underground air-deficient heat exhaust area

Abstract

The present invention discloses a centralized refrigeration and cooling system and method for underground air-deficient heat exhaust areas in the field of underground heat damage control technology. The system comprises a chilled water system, a cooling water system, and a spray water system. The chilled water system produces chilled water through a refrigeration chamber and then transports it to the working face transport tunnel. The air cooler is controlled by a valve to perform heat exchange treatment on the high-temperature incoming air of each working face. The cooling water system dissipates the condensation heat generated by the chilled water produced by the chilled water system through a closed cooling tower in the return air tunnel. The spray water system extracts spray water through the spray chamber and sprays the closed cooling tower in the return air tunnel. The present invention has the characteristics of high refrigeration efficiency, simple implementation, low investment, short construction period, the ability to add refrigeration pipelines according to the needs of the mining working face, and ensuring that the mine can be mined for a long time without the need for relocation. It can effectively solve the high temperature problem of the working face.

Description

Technical Field

[0001] The present invention relates to a centralized refrigeration and cooling system and method for an underground air-deficient heat exhaust area, belonging to the technical field of underground heat damage control. Background Art

[0002] In recent years, my country's mines have gradually entered the stage of deep mining. As mine mining gradually develops deeper, high temperature problems in mines are inevitable. Controlling heat damage not only meets the needs of normal and safe production of the working face, but also improves labor productivity and reflects the needs of people-oriented.

[0003] Mine heat damage prevention and control technologies can be divided into two categories: non-mechanical cooling and mechanical refrigeration. Ventilation cooling, a typical example of non-mechanical cooling, is primarily suitable for shallow mines due to its limited cooling effect. Deeper coal mines, however, face greater heat damage due to their larger cooling loads, necessitating the introduction of more efficient mechanical refrigeration technologies. Mechanical refrigeration technologies are broadly categorized as integrated underground centralized refrigeration and cooling systems, distributed underground centralized refrigeration and cooling systems, and surface centralized refrigeration and cooling systems. While effective, integrated underground centralized refrigeration and cooling systems are difficult to apply to mines where overall heat damage is less severe but localized heat damage is more severe due to high equipment investment and limited installation space. Distributed underground centralized refrigeration and cooling systems, while simple to implement, require minimal investment, and are mobile, are primarily used in the early stages of coal mining or during expansion, and cannot effectively address heat damage throughout the mine. Existing localized refrigeration equipment suffers from high air discharge temperatures, excessive consumption of water and fresh air resources, and a high failure rate. Ground centralized refrigeration and cooling systems usually adopt a heat dissipation method of above-ground heat dissipation and underground centralized cooling. They are generally suitable for mines with large heat loads and cannot meet the differentiated needs of deep mines. They are easily affected by mine pressure and are difficult to maintain. They cannot effectively cool down the high-temperature deep-well working face. Their high-pressure cold water needs to be processed with the help of a pressure reduction system. This type of equipment has long relied on imports and has problems such as high equipment investment, long construction period, large footprint, and inconvenience in movement. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a centralized refrigeration and cooling system and method for the underground air exhaust and heat exhaust area, which has the characteristics of high refrigeration efficiency, simple implementation, small investment, short construction period, and the ability to add refrigeration pipes according to the needs of the mining working face to ensure that the mine mining does not need to be relocated for a long time, and can better solve the high temperature problem of the working face.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] In the first aspect, the present invention provides a centralized refrigeration and cooling system for an underground air exhaust and heat removal area, comprising a chilled water system, a cooling water system and a spray water system. The chilled water system produces chilled water through a refrigeration chamber and then transports it to the working face transport tunnel. The air cooler is controlled by a valve to perform heat exchange treatment on the high-temperature incoming air of each working face. The cooling water system dissipates the condensation heat generated by the chilled water produced by the chilled water system through a closed cooling tower in the return air tunnel. The spray water system draws spray water through the spray chamber and sprays the closed cooling tower in the return air tunnel.

[0007] Furthermore, the chilled water system includes a refrigeration main unit arranged in the refrigeration chamber. The chilled water taken by the refrigeration main unit is driven by a chilled water pump and transported to the air cooler through an insulated chilled water pipe to exchange heat with the high-temperature incoming air of the working face. The chilled water return after the heat exchange is transported through a pipe to a fully automatic clean water filter for mining for water treatment and then returned to the refrigeration main unit. A pressure maintaining system is arranged between the fully automatic clean water filter for mining and the refrigeration main unit.

[0008] Furthermore, the refrigeration main machine extracts the condensation heat generated by the chilled water and transports the cooling water to the closed cooling tower for heat dissipation through the cooling water pump and the insulated cooling water pipe. After the heat dissipation is completed, the cooling water is returned to the refrigeration main machine through the pipe.

[0009] Furthermore, the spray water system includes a spray water pump arranged in the spray chamber. After the spray water pump draws spray water from the spray water pool, it is transported to the clean water filter through the spray pipe for water treatment, and then the spray water is evenly covered on the surface of the closed cooling tower through the spray device for heat exchange. After the heat exchange is completed, the spray water is recovered to the spray water pool through the pipe.

[0010] Furthermore, the pipelines of the chilled water system, cooling water system and spray water system are all equipped with monitoring equipment and pipeline valves, and the monitoring equipment and pipeline valves are electrically connected to a central controller. The monitoring equipment includes a flow meter, a thermometer and a pressure gauge, and the pipeline valves include electric gate valves, electric regulating valves, butterfly valves and gate valves.

[0011] Furthermore, the central controller:

[0012] Based on the data collected by the flow meter, the dynamic energy efficiency ratio is calculated in real time to make an energy efficiency determination, and only in response to the dynamic energy efficiency ratio being lower than a set threshold, the chilled water pump frequency is increased and the cooling water flow rate is reduced;

[0013] The heat exchange efficiency deviation value is calculated in real time based on the collected data of the flow meter and thermometer. Only when the heat exchange efficiency deviation value exceeds the allowable deviation, the spray water pump and the clean water filter are linked to start the backwash mode and adjust the spray water coverage angle at the same time.

[0014] Furthermore, the calculation formula of the dynamic energy efficiency ratio is:

[0015] Where: is the dynamic energy efficiency ratio, is the chilled water flow rate, is the temperature difference between the inlet and outlet of chilled water, is the cooling water flow rate, is the temperature difference between the inlet and outlet of cooling water.

[0016] Furthermore, the calculation formula of the heat exchange efficiency deviation value is:

[0017] Where: is the heat exchange efficiency deviation value, is the theoretical value of heat exchange efficiency, is the actual value of heat exchange efficiency, 、 is the spray water outlet / inlet temperature, 、 is the cooling water outlet / inlet temperature, is the ambient temperature of the return air tunnel, is the spray water flow rate, is the cooling water flow rate.

[0018] In a second aspect, the present invention provides a method for centralized refrigeration and cooling of an underground ventilation heat exhaust area, which is based on the above-mentioned centralized refrigeration and cooling system for an underground ventilation heat exhaust area and includes the following steps:

[0019] After the chilled water system produces chilled water, it is transported to the working face transport tunnel through the refrigeration chamber. The air cooler is controlled by the valve to perform heat exchange treatment on the high-temperature incoming air of each working face.

[0020] The condensation heat generated by the chilled water system is dissipated through the closed cooling tower in the return air lane;

[0021] The spray water is drawn from the spray chamber to spray the closed cooling tower in the return air tunnel.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This solution applies underground mobile equipment to the underground centralized refrigeration and cooling system. It features high cooling efficiency, simple implementation, low investment, and a short construction period. It can also add refrigeration pipes based on the needs of the mining face, ensuring that the mine can be mined without relocation for a long time. It effectively solves the problem of high temperatures at the working face while fully utilizing the cavern layout, significantly reducing project investment and improving the project's economic and feasibility. This solution is of great significance in terms of design theory, construction methods, improving the underground working environment, and enhancing employee comfort, providing a strong guarantee for safe production and sustainable development in the mining area.

[0024] 2. This plan is adopted The indicator realizes the energy efficiency linkage analysis of chilled water and cooling water, breaking the limitation of traditional single system independent regulation. The model accurately identifies abnormal heat dissipation in closed cooling towers, improving fault prediction efficiency compared to traditional manual inspections. This solution automatically matches optimal operating parameters based on real-time energy efficiency data, reduces ineffective energy consumption, and reduces equipment losses caused by scaling of the spray device through early warning of heat exchange efficiency deviations. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 This is a schematic structural diagram of a centralized refrigeration and cooling system for underground ventilation and heat removal areas provided in Example 1 of the present invention;

[0027] Figure 2 A schematic diagram of the pipeline arrangement structure of a centralized refrigeration and cooling system for an underground ventilation and heat exhaust area provided in the first embodiment of the present invention when a coal mining working face is added;

[0028] In the figure: 1. Closed cooling tower; 2. Cooling water pump; 3. Spray water pump; 4. Refrigeration main unit; 5. Chilled water pump; 6. Air cooler; 7. Pressure maintaining system; 8. Mine-use fully automatic clean water filter; 9. Insulated cooling water pipeline; 10. Insulated chilled water pipeline; 11. Butterfly valve 1; 12. Butterfly valve 2; 13. Refrigeration chamber; 14. Return air tunnel; 15. Spray chamber; 16. Coal mining face 1; 17. Coal mining face 2; 18. Coal mining face 3; 19. Coal mining face 4. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0030] The following detailed description is an exemplary description and is intended to provide further detailed description of the present invention. Unless otherwise indicated, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.

[0031] Example 1:

[0032] A centralized refrigeration and cooling system for underground exhaust air heat removal areas. This solution applies underground mobile equipment to the underground regional centralized refrigeration and cooling system. By rationally selecting the placement of the cooling tower, it ensures that the mine does not need to be relocated for a long time during mining, thereby improving the stability and economy of the system. High-pressure ratio compressors and exhaust air heat removal refrigeration units are selected, and the closed cooling tower adopts a zero-electrical design. The technology is advanced and reasonable, aiming to significantly reduce project investment and improve the economic and feasibility of the project. The overall structure of this solution includes: chilled water system, cooling water system and spray water system. Specifically:

[0033] The chilled water system includes a refrigeration unit 4, a chilled water pump 5, an air cooler 6, a pressure maintenance system 7, a fully automatic mine-use water filter 8, a monitoring and control system, and an insulated chilled water pipeline 10. The refrigeration unit 4 is located in the refrigeration chamber 13; the chilled water pump 5 is located on the chilled water supply pipeline between the refrigeration unit 4 and the insulated chilled water pipeline 10; the air cooler 6 is located in the main transport lane of the working face; the pressure maintenance system 7 is located between the fully automatic mine-use water filter 8 and the refrigeration unit 4; the fully automatic mine-use water filter 8 is located on the chilled water return main; the monitoring and control system includes monitoring equipment such as flow meters, thermometers, and pressure gauges, as well as pipeline valves such as electric gate valves, electric regulating valves, butterfly valves, and gate valves, located on the insulated chilled water pipeline 10.

[0034] The cooling water system includes a closed cooling tower 1, a cooling water pump 2, a monitoring and control system, and an insulated cooling water pipeline 9. The closed cooling tower 1 is located in the return air lane 14; the cooling water pump 2 is located on the cooling water supply pipeline between the closed cooling tower 1 and the refrigeration unit 4; the monitoring and control system includes monitoring equipment such as flow meters, thermometers, and pressure gauges, as well as pipeline valves such as electric gate valves, electric regulating valves, butterfly valves, and gate valves, located on the insulated cooling water pipeline 9.

[0035] The spray water system includes a spray water pump 3, a spray water tank, a fully automatic clean water filter 8 for mining, a spray device, a monitoring and control system, and a spray water pipeline. The spray water pump 3 is located in the spray chamber 15; the spray water tank is located between the spray water pump 3 and the closed cooling tower 1; the fully automatic clean water filter 8 is located on the spray water supply pipeline after the spray water pump 3; the spray device is located at the fan of the closed cooling tower 1; the monitoring and control system includes monitoring equipment such as flow meters and pressure gauges, as well as pipeline valves such as electric gate valves, electric regulating valves, butterfly valves, and gate valves, located on the spray water pipeline.

[0036] The specific work flow of this scheme to cool the coal mining face is as follows:

[0037] S1. Chilled water is produced by the refrigeration unit 4 in the chilled water system. The refrigeration unit 4 is located in the refrigeration chamber 13. The chilled water produced by the refrigeration unit 4 is driven by the chilled water pump 5 and then transported through the insulated chilled water pipe 10 to the air cooler 6 for heat exchange, cooling the high-temperature incoming air from the working face, thereby achieving a cooling effect on the working face. The chilled water return from the air cooler 6 is transported through the insulated chilled water pipe 10 to the fully automatic mine water filter 8. After water treatment by the fully automatic mine water filter 8, it returns to the refrigeration unit 4, forming a closed loop of the chilled water system. The pressure maintenance system 7 located between the fully automatic mine water filter 8 and the refrigeration unit 4 has functions such as pressure regulation, intelligent water replenishment, and exhaust degassing. It is used to maintain the pressure stability of the entire chilled water system, ensuring the efficiency and safety of the chilled water circulation. The system also relies on a monitoring and control system composed of multiple sensors and intelligent control systems to monitor the operation of the chilled water system and optimize energy efficiency.

[0038] S2. Heat from condensation heat is removed from the exhaust air through the closed cooling tower 1 in the cooling water system. The closed cooling tower 1 is located in the return air tunnel 14. The refrigeration unit 4 generates a significant amount of condensation heat while producing chilled water. This heat is transported to the closed cooling tower 1 via the cooling water pump 2, which then dissipates the heat into the exhaust air. After heat dissipation, the cooling water is then transported to the refrigeration unit 4 through the insulated cooling water pipe 9, forming a closed cooling water system loop. A monitoring and control system comprised of multiple sensors and an intelligent control system monitors the operation of the cooling water system and optimizes energy efficiency.

[0039] S3. To enhance heat exchange between the closed cooling tower 1 and the exhaust air, a spray water system is installed to spray water on the cooling tower's exterior. A spray water pump 3 is located within the spray chamber 15. Spray water is drawn from the spray pool by the pump 3 and transported through a spray pipe to a fully automatic mining water filter 8 for water treatment. The treated spray water then passes through a spray device, forming fine droplets or mist that evenly coat the surface of the closed cooling tower 1, enhancing heat exchange with the exhaust air. Finally, the spray water, after heat exchange in the closed cooling tower 1, is recycled back into the spray pool, completing the spray water system cycle.

[0040] S4, add refrigeration and cooling to the coal mining face. When the newly expanded coal mining face needs to be cooled and cooled, the centralized refrigeration and cooling system for the exhaust air heat removal area of ​​the present invention can be used to reasonably select the location of the cooling tower, so that the entire refrigeration system does not need to be relocated. The specific process is as follows Figure 2As shown, when existing coal mining face 16 is already using the present invention's cooling system and a newly added coal mining face 4 19 requires simultaneous cooling, butterfly valve 11 on coal mining face 16 is closed, and an insulated chilled water pipe, butterfly valve 2 12, and air cooler are added to the corresponding coal mining face 4 19. Once the cooling water system for coal mining face 4 19 is deployed, butterfly valves 11 and 2 12 are opened to achieve simultaneous cooling of both coal mining faces.

[0041] In summary, this program adopts systematic heat damage control measures, with innovative research methods and reliable process innovations, which will lead the development of process technologies for heat damage prevention and control. The present invention applies underground mobile equipment to underground centralized refrigeration and cooling systems, and rationally selects the placement of cooling towers to ensure that the mine does not need to be relocated for a long time, thereby improving the stability and economy of the system. High-pressure ratio compressors and exhaust air heat exhaust refrigeration main units are selected, and closed cooling towers adopt zero-electrical design, which is technologically advanced and reasonable. At the same time, full use is made of the cavern layout, which greatly reduces engineering investment and improves the economy and feasibility of the project. It is of great significance in terms of design theory, construction methods, improving the underground working environment, and improving the comfort of employees, and provides a strong guarantee for the safe production and sustainable development of the mining area.

[0042] Example 2:

[0043] Traditional underground refrigeration system monitoring equipment mostly adopts an independent collection mode, and only realizes passive management through threshold alarms of flow, temperature, and pressure parameters, and lacks the ability to dynamically analyze the operating status of multiple systems. For example, the energy efficiency correlation between chilled water and cooling water systems, and the real-time matching of spray water and cooling tower heat dissipation efficiency have not been effectively modeled, resulting in system regulation lag and high energy consumption. Existing technologies are difficult to achieve active optimization control through data linkage analysis, and a dynamic control solution based on multi-parameter fusion calculation is urgently needed. This embodiment constructs a dynamic analysis model based on the coupling of flow-temperature-pressure multi-parameters, and introduces the dynamic energy efficiency ratio ( )、heat exchange efficiency deviation value( ) two core indicators to achieve real-time evaluation and active regulation of system energy efficiency. The specific contents are as follows:

[0044] 1. Calculate the dynamic energy efficiency ratio (EER) by the central controller of the centralized refrigeration and cooling system in the underground ventilation heat removal area ), quantifies the chilled water cooling capacity of the refrigeration host under unit cooling water energy consumption, reflecting the overall energy efficiency of the system. The calculation formula is:

[0045] Where: is the dynamic energy efficiency ratio, is the chilled water flow rate (real-time data from the flow meter, unit: m³ / h); is the temperature difference between the inlet and outlet of chilled water (thermometer data, unit: °C); is the cooling water flow rate (real-time data from the flow meter, unit: m³ / h); is the temperature difference between the inlet and outlet of cooling water (thermometer data, unit: ℃).

[0046] 2. The central controller calculates the heat exchange efficiency deviation value in real time based on the correlation data of the spray water and cooling water systems ( ) to evaluate the deviation between the actual heat dissipation efficiency of the closed cooling tower and the theoretical value, and identify the uneven coverage of the spray water or scaling problems. The calculation formula is:

[0047] Where: is the heat exchange efficiency deviation value, is the theoretical value of heat exchange efficiency, is the actual value of heat exchange efficiency; 、 The outlet / inlet temperature of the spray water (thermometer data); 、 is the cooling water outlet / inlet temperature (thermometer data); is the ambient temperature of the return air lane (thermometer data); is the spray water flow rate (flow meter data).

[0048] The above scheme is used to optimize and control the deep coal mine refrigeration system. The specific contents are as follows:

[0049] 1. Data collection and calculation:

[0050] Real-time data collection through distributed sensors =151m³ / h, =490m³ / h; chilled water inlet and outlet temperature: inlet 14.4℃ / outlet 3℃, cooling water inlet and outlet temperature: inlet 53℃ / outlet 58℃; =11.4℃, =5℃; calculated The set threshold is 0.7, and energy efficiency is considered normal when it is above 0.7.

[0051] Detection =32℃, =490m³ / h, =375m³ / h, =53℃, =58℃, =55℃, =54.5℃, calculated The set threshold is 0.04, and energy efficiency is considered normal when it is below 0.04.

[0052] 2. Dynamic control execution:

[0053] when When the temperature is continuously below 0.7, the chilled water pump frequency will be automatically increased and the cooling water flow rate will be reduced to prioritize energy efficiency.

[0054] when If the deviation exceeds 0.04, the spray water pump and the mine-used fully automatic clean water filter will start the backwash mode and adjust the spray water coverage angle at the same time.

[0055] This program is passed The indicator realizes the energy efficiency linkage analysis of chilled water and cooling water, breaking the limitation of traditional single system independent regulation. The model accurately identifies abnormal heat dissipation in closed cooling towers, improving fault prediction efficiency compared to traditional manual inspections. This solution automatically matches optimal operating parameters based on real-time energy efficiency data, reduces ineffective energy consumption, and reduces equipment losses caused by scaling of the spray device through early warning of heat exchange efficiency deviations.

[0056] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A centralized refrigeration and cooling system for underground air exhaust heat removal area, characterized by: It comprises a chilled water system, a cooling water system and a spray water system. The chilled water system produces chilled water through a refrigeration chamber (13) and then transports it to the working face transport tunnel. The air cooler (6) is controlled by a valve to perform heat exchange treatment on the high-temperature incoming air of each working face. The cooling water system dissipates the condensation heat generated by the chilled water produced by the chilled water system through a closed cooling tower (1) in the return air tunnel (14). The spray water system extracts spray water through a spray chamber (15) and sprays the closed cooling tower (1) in the return air tunnel (14). The pipelines of the chilled water system, cooling water system and spray water system are all equipped with monitoring equipment and pipeline valves, and the monitoring equipment and pipeline valves are electrically connected to the central controller. The monitoring equipment includes a flow meter, a thermometer and a pressure gauge, and the pipeline valves include electric gate valves, electric regulating valves, butterfly valves and gate valves; The central controller: Based on the data collected by the flow meter, the dynamic energy efficiency ratio is calculated in real time to make an energy efficiency determination, and only in response to the dynamic energy efficiency ratio being lower than a set threshold, the chilled water pump frequency is increased and the cooling water flow rate is reduced; The heat exchange efficiency deviation value is calculated in real time based on the data collected by the flow meter and thermometer. Only when the heat exchange efficiency deviation value exceeds the allowable deviation, the spray water pump and the clean water filter are linked to start the backwash mode and adjust the spray water coverage angle at the same time; The calculation formula of the dynamic energy efficiency ratio is: Where: is the dynamic energy efficiency ratio, is the chilled water flow rate, is the temperature difference between the inlet and outlet of chilled water, is the cooling water flow rate, is the temperature difference between the inlet and outlet of cooling water; The calculation formula of the heat exchange efficiency deviation value is: Where: is the heat exchange efficiency deviation value, is the theoretical value of heat exchange efficiency, is the actual value of heat exchange efficiency, 、 is the spray water outlet / inlet temperature, 、 is the cooling water outlet / inlet temperature, is the ambient temperature of the return air tunnel, is the spray water flow rate, is the cooling water flow rate.

2. The underground air exhaust heat removal area centralized refrigeration and cooling system according to claim 1 is characterized in that: The chilled water system includes a refrigeration main unit (4) arranged in a refrigeration chamber (13). The chilled water produced by the refrigeration main unit (4) is driven by a chilled water pump (5) and transported to an air cooler (6) through an insulated chilled water pipe (10) to perform heat exchange on the high-temperature incoming air of the working face. After the heat exchange is completed, the chilled water return water is transported through a pipe to a mine-use full-automatic clean water filter (8) for water treatment and then returned to the refrigeration main unit (4). A pressure maintaining system (7) is provided between the mine-use full-automatic clean water filter (8) and the refrigeration main unit (4).

3. The underground air exhaust heat removal area centralized refrigeration and cooling system according to claim 2 is characterized in that: The condensation heat generated by the chilled water produced by the refrigeration main unit (4) is sequentially transported through the cooling water pump (2) and the heat-insulating cooling water pipe (9) to the closed cooling tower (1) for heat dissipation. After the heat dissipation is completed, the cooling water is returned to the refrigeration main unit (4) through the pipe.

4. The underground air exhaust heat removal area centralized refrigeration and cooling system according to claim 3 is characterized in that: The spray water system includes a spray water pump (3) arranged in a spray chamber (15). The spray water pump (3) extracts spray water from the spray water pool, transports the water to the clean water filter through the spray pipe, and then performs water treatment. The water is then evenly covered on the surface of the closed cooling tower (1) through the spray device for heat exchange. After the heat exchange is completed, the spray water is recovered to the spray water pool through the pipe.

5. A centralized refrigeration and cooling method for underground ventilation and heat removal areas, characterized by: The centralized refrigeration and cooling system for underground ventilation and heat removal areas according to claim 1 is implemented, comprising the following steps: After the chilled water system produces chilled water, it is transported to the working face transport tunnel through the refrigeration chamber (13), and the air cooler (6) is controlled by the valve to perform heat exchange treatment on the high-temperature air inlet of each working face; The condensation heat generated by the chilled water produced by the chilled water system is dissipated through the closed cooling tower (1) in the return air lane (14); Spray water is drawn from the spray chamber (15) to spray the closed cooling tower (1) in the return air lane (14).

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