Novel ventilation cooling system for deep well long-distance excavation working face

Abstract

The invention relates to the technical field of mine cooling, in particular to a novel ventilation and cooling system for a deep well long-distance excavation working face, which comprises a contra-rotating axial-flow ventilator and two refrigeration and cooling systems, the other refrigeration cooling system comprises a second direct expansion combined cabinet and a second refrigeration host, a first air duct is connected to an air outlet of the counter-rotating axial-flow ventilator, the first air duct is connected with a first direct expansion combined cabinet, the tail of the first direct expansion combined cabinet is connected with a second air duct connected with the second direct expansion combined cabinet, and the tail of the second direct expansion combined cabinet is connected with an air outlet of the counter-rotating axial-flow ventilator. And the tail part of the second direct expansion combined cabinet is connected with a third air duct. Fresh air is cooled step by step through the two refrigerating and cooling systems, and the cooled fresh air is conveyed to the excavation working face through the air duct, so that the effects of cooling and dehumidifying the excavation working face are achieved, the working environment of workers is effectively improved, and the production safety is improved.

Description

Technical Field

[0001] This invention relates to the field of mine cooling technology, specifically to a novel ventilation and cooling system for deep, long-distance mining faces. Background Technology

[0002] As mining depth increases, underground temperatures rise continuously, leading to an increase in heat and harmful gases from rock strata, gas, and equipment. Mine heat hazards have become another prominent disaster following the five major hazards of roof collapse, gas, water, fire, and dust. Temperatures at the working faces of production mines reach 26°C, and return air temperatures can reach 36°C, causing a rapid deterioration of the production environment, a significant reduction in labor efficiency, and severely hindering safe production. To address the technical challenges of long-distance cooling and dehumidification at working faces, techniques such as optimizing ventilation layout, increasing cooling ventilation volume, and using localized ice blocks for auxiliary cooling and heat dissipation have been adopted. These methods have alleviated the cooling effect to some extent, but they also present problems such as high investment, high operating costs, and complex system engineering. In existing technologies, based on the ventilation needs of the mining face and considering factors such as the face length, number of workers, roadway size, equipment operating conditions, and ventilation system design, counter-rotating axial flow local ventilators are typically installed in the outer roadways. These fans draw in air from the intake side, compress it through counter-rotating airflow, and then transport it over a long distance to the working face via insulated ducts. This satisfies the needs of personnel breathing, equipment cooling, and timely dispersal of methane and other waste gases. Finally, the waste gases are pumped back to the surface via the return airway, maintaining the balance of the roadway ventilation system and meeting the needs of safe mine production. However, with the development of deep mines, the underground temperature gradually increases with depth, causing the air temperature drawn in by the counter-rotating axial flow ventilators to reach over 20 degrees Celsius, and the air temperature delivered to the working face to be even higher, posing a risk of high-temperature heat damage to safe production. Therefore, there is an urgent need for a new ventilation and cooling system for long-distance mining faces in deep mines to solve the cooling problem. Summary of the Invention

[0003] In order to solve the problem that existing technologies cannot effectively cool down long-distance deep well excavation faces, resulting in high-temperature heat damage to safe production, this invention provides a new ventilation and cooling system for long-distance deep well mining faces. This system can effectively cool down and reduce humidity at the excavation face.

[0004] To achieve the above objectives, the technical solution of the present invention is: a novel ventilation and cooling system for long-distance deep well mining faces, comprising a counter-rotating axial flow fan and two refrigeration systems. One of the refrigeration systems comprises a first direct-expansion combination cabinet and a first refrigeration unit, the first direct-expansion combination cabinet being connected to the first refrigeration unit via a pipe. The other refrigeration system comprises a second direct-expansion combination cabinet and a second refrigeration unit, the second direct-expansion combination cabinet being connected to the second refrigeration unit via a pipe. The counter-rotating axial flow fan can deliver fresh air to the two refrigeration systems, and the two refrigeration systems gradually cool the fresh air to deliver the cooled fresh air to the excavation face for cooling and dehumidification.

[0005] The counter-rotating axial flow fan has a first air duct connected to its outlet. The first air duct is connected to a first direct expansion unit. The tail of the first direct expansion unit is connected to a second air duct connected to a second direct expansion unit. The tail of the second direct expansion unit is connected to a third air duct. The counter-rotating axial flow fan delivers fresh air to the first direct expansion unit through the first air duct. The first direct expansion unit performs a first-stage cooling on the fresh air before delivering it to the second direct expansion unit through the second air duct. The second direct expansion unit performs a second-stage cooling on the fresh air.

[0006] It also includes a cooling water circulation system connected to the first and second refrigeration units. The cooling water circulation system is connected to a water replenishment system. Through the cooperation of the cooling water circulation system with the first and second refrigeration units, heat exchange is achieved, and the heat of the fresh air obtained from the heat exchange is carried away, so that the two refrigeration systems can continuously cool the fresh air.

[0007] Furthermore, both the first and second direct expansion combination cabinets include an evaporator and a throttling valve. Both the first and second refrigeration units include a compressor, a plate condenser, a dryer filter, and an economizer. The compressor is used to compress the gaseous refrigerant into a high-temperature, high-pressure gaseous state. The plate condenser cools the gaseous refrigerant with cooling water to form a liquid refrigerant, which is then delivered to the evaporator through the throttling valve, so that the evaporator absorbs heat from the fresh air and achieves the effect of cooling the fresh air.

[0008] Furthermore, there are two counter-rotating axial flow fans, and each of the counter-rotating axial flow fans is connected to a fan duct at its air outlet. Both fan ducts are connected to the first fan duct, with the aim of increasing the delivery volume of fresh air.

[0009] Furthermore, the cooling water circulation system includes a closed-loop cooling tower, cooling water pipes, a manifold, and a return pipe. A spray water circulation system is installed on the closed-loop cooling tower. One end of the cooling water pipe is connected to the closed-loop cooling tower, and the other end is connected to three pumping units. All three pumping units are connected to the manifold, which is connected to two cooling branch pipes. These two cooling branch pipes are respectively connected to the first and second refrigeration units. One end of the return pipe is connected to the closed-loop cooling tower, and the other end is connected to two return branch pipes. These two return branch pipes are respectively connected to the first and second refrigeration units. The cooling water circulation system is used to transport cooling water to the plate condensers of the first and second refrigeration units for heat exchange. The closed-loop cooling tower is used to cool the cooled water after heat exchange, achieving the effect of cooling water recycling.

[0010] Furthermore, the pumping unit includes a water branch pipe connected to the cooling water pipe and the manifold. A second water pump is installed on the water branch pipe. A second butterfly valve, a first check valve, and a third pressure gauge are also installed on the water branch pipe. The cooling water can be pumped to the first refrigeration unit and the second refrigeration unit through the return pipe via the second water pump.

[0011] Furthermore, the cooling water pipe is equipped with a first butterfly valve, a first pressure gauge, and a first temperature sensor. The cooling water pipe is also equipped with a water filling unit, which includes a water supply pipe connected to the cooling water pipe. The water supply pipe is equipped with a first shut-off valve, a second pressure gauge, and a first water pump. Before the system is used, the cooling water pipe can be filled with water using the water filling unit.

[0012] Furthermore, the cooling branch pipe is equipped with a third butterfly valve, a fourth pressure gauge, and a second temperature sensor; the return branch pipe is equipped with a third temperature sensor, a fourth butterfly valve, and a fifth pressure gauge; and the return pipe is equipped with a fifth butterfly valve, a sixth pressure gauge, and a fourth temperature sensor.

[0013] Furthermore, the spray water circulation system includes a circulating water pipe and three circulating water pump units installed on the circulating water pipe. One end of the circulating water pipe is connected to the water collection tank of the closed cooling tower, and the other end is connected to the spray pipe of the closed cooling tower. The three circulating water pump units are connected in parallel. Each circulating water pump unit includes a circulating branch pipe, on which a third water pump is installed. The circulating branch pipe is also equipped with a seventh pressure gauge, a second check valve, and a sixth butterfly valve. The cooling water in the closed cooling tower can be circulated and reused through the spray water circulation system.

[0014] Furthermore, the water replenishment system includes a softened water tank and a softened water pipe. The two ends of the softened water pipe are connected to the softened water tank and the closed cooling tower, respectively. The softened water tank is connected to a water supply pipe and a drain pipe. The other end of the drain pipe is connected to two drain branch pipes. The two drain branch pipes are connected to the first and second direct expansion combination cabinets, respectively. A second shut-off valve is installed on the drain branch pipe. When the water volume in the entire system decreases, water can be replenished to the closed cooling tower using the water replenishment system.

[0015] The beneficial effects of the present invention through the above technical solution are as follows:

[0016] This invention effectively cools and dehumidifies the excavation face. Fresh air is drawn in by a counter-rotating axial flow fan and sequentially delivered to two refrigeration systems. These systems cool the fresh air in stages, resulting in high heat exchange performance, preventing air mixing, and ensuring high outlet temperature stability. The cooled fresh air is then delivered to the excavation face through a duct, thus achieving the effect of cooling and dehumidifying the excavation face. This effectively improves the working environment for employees and enhances production safety.

[0017] The cooling water circulation system of the present invention is used to transport cooling water to the first refrigeration unit and the second refrigeration unit, and to process the cooling water after heat exchange. By cooperating with the first refrigeration unit and the second refrigeration unit, it achieves the effect of heat exchange, so as to remove the heat of the fresh air obtained by the two refrigeration and cooling systems, and achieve the effect of continuous cooling of the fresh air by the two refrigeration and cooling systems. The closed cooling tower of the cooling water circulation system is used to cool the cooling water after heat exchange, thereby achieving the effect of cooling water recycling.

[0018] The softened water tank of the water replenishment system of this invention serves to replenish water to the system. When the water volume in the entire system decreases, water can be replenished to the closed cooling tower through the softened water pipe. At the same time, it also has the function of collecting the water generated by the first and second direct expansion combination tanks. The water generated by the first and second direct expansion combination tanks can be transported to the softened water tank through the drainage branch pipe and the drainage pipe. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the novel ventilation and cooling system for long-distance deep well mining faces of the present invention.

[0020] The attached diagram is labeled as follows: 1 is a counter-rotating axial flow fan; 2 is the first air duct; 3 is the first direct expansion unit; 4 is the second air duct; 5 is the second direct expansion unit; 501 is the third air duct; 6 is the first refrigeration unit; 7 is the second refrigeration unit; 8 is a closed-circuit cooling tower; 9 is a cooling water pipe; 901 is the first butterfly valve; 902 is the first pressure gauge; 903 is the first temperature sensor; 10 is the water supply pipe; 11 is the first shut-off valve; 12 is the second pressure gauge; 13 is the first water pump; 14 is the water branch pipe; 15 is the second water pump; 16 is the second butterfly valve; 17 is the first check valve; 18 is the third pressure gauge; and 19 is the manifold. 20 is the cooling branch pipe, 21 is the third butterfly valve, 22 is the fourth pressure gauge, 23 is the second temperature sensor, 24 is the return branch pipe, 25 is the third temperature sensor, 26 is the fourth butterfly valve, 27 is the fifth pressure gauge, 28 is the return pipe, 29 is the fifth butterfly valve, 30 is the sixth pressure gauge, 31 is the fourth temperature sensor, 32 is the softened water tank, 3201 is the water supply pipe, 33 is the drain pipe, 34 is the drain branch pipe, 35 is the second shut-off valve, 36 is the softened water pipe, 37 is the circulating water pipe, 38 is the circulating branch pipe, 39 is the seventh pressure gauge, 40 is the third water pump, 41 is the second check valve, and 42 is the sixth butterfly valve. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0022] like Figure 1 As shown, a novel ventilation and cooling system for deep, long-distance mining faces is installed in an underground mine chamber. This system includes a counter-rotating axial flow fan 1 and two cooling systems. One cooling system comprises a first direct-expansion unit 3 and a first refrigeration unit 6, with the first direct-expansion unit 3 connected to the first refrigeration unit 6 via a pipe. The other cooling system comprises a second direct-expansion unit 5 and a second refrigeration unit 7, with the second direct-expansion unit 5 connected to the second refrigeration unit 7 via a pipe. In this embodiment, the counter-rotating axial flow fan 1 is used to deliver fresh air to the two cooling systems, allowing the two cooling systems to cool the fresh air in stages.

[0023] The counter-rotating axial flow fan 1 is connected to a first air duct 2 at its outlet. The first air duct 2 is connected to a first direct expansion unit 3. The tail of the first direct expansion unit 3 is connected to a second air duct 4, which is connected to a second direct expansion unit 5. The tail of the second direct expansion unit 5 is connected to a third air duct 501. In this embodiment, the first air duct 2, the second air duct 4, and the third air duct 501 are all insulated air ducts. The counter-rotating axial flow fan 1 draws in fresh air and delivers it to the first direct expansion unit 3 through the first air duct 2. After primary cooling treatment by the first direct expansion unit 3, the fresh air is then delivered to the second direct expansion unit 5 through the second air duct 4. The second direct expansion unit 5 performs secondary cooling treatment on the fresh air, and finally, the fresh air is delivered to the excavation face through the third air duct 501, thereby achieving the effect of cooling and dehumidifying the excavation face and improving the working environment.

[0024] It also includes a cooling water circulation system connected to the first refrigeration unit 6 and the second refrigeration unit 7. The cooling water circulation system is connected to a water replenishment system. In this embodiment, the cooling water circulation system can transport cooling water to the first refrigeration unit 6 and the second refrigeration unit 7 to achieve the effect of heat exchange, and at the same time, it can treat the cooling water after heat exchange.

[0025] Both the first direct expansion combined cabinet 3 and the second direct expansion combined cabinet 5 include an evaporator and a throttling valve. Both the first refrigeration unit 6 and the second refrigeration unit 7 include a compressor, a plate condenser, a dryer filter, and an economizer. Specifically, the plate condenser is connected to the cooling branch pipe 20 and the return branch pipe 24 of the cooling water circulation system. In this embodiment, when the two refrigeration and cooling systems cool the fresh air, the compressor compresses the gaseous refrigerant into a high-temperature and high-pressure gaseous state and delivers it to the plate condenser. It exchanges heat with the cooling water delivered by the cooling water circulation system for cooling. After cooling, it becomes a medium-temperature and high-pressure liquid refrigerant. Then, after being filtered and dehumidified by the dryer filter, it is delivered to the evaporator through the pipeline. After being processed by the throttling valve, it is depressurized into a low-temperature and low-pressure liquid refrigerant. It absorbs the heat of the fresh air through the evaporator, achieving the effect of cooling the fresh air. After absorbing heat, it vaporizes and becomes gaseous again. It then returns to the compressor through the pipeline to continue compression and refrigeration, achieving the effect of continuously cooling the fresh air. In this embodiment, both the first direct expansion combined cabinet 3 and the second direct expansion combined cabinet 5 include two independent evaporators. Both the first refrigeration unit 6 and the second refrigeration unit 7 include two compressors, plate condensers, dryer filters, and economizers. The cooling capacity of the first direct expansion combined cabinet 3 and the first refrigeration unit 5 is 665 kW, containing two-stage refrigeration with a first-stage cooling capacity of 365 kW and a second-stage cooling capacity of 330 kW. The cooling capacity of the second direct expansion combined cabinet 5 and the second refrigeration unit 7 is 420 kW, containing two-stage refrigeration with a first-stage cooling capacity of 240 kW and a second-stage cooling capacity of 200 kW. A step-by-step cooling method is adopted, which results in small cooling volume and high heat exchange performance.

[0026] The number of counter-rotating axial flow fans 1 is two, each with a power of 55kW, and the total power of the two counter-rotating axial flow fans 1 is 110kW. The air outlet of each counter-rotating axial flow fan 1 is connected to a fan duct, and both fan ducts are connected to the first fan duct 2. In this embodiment, the two counter-rotating axial flow fans 1 are connected in parallel to increase the amount of fresh air drawn. The counter-rotating axial flow fans 1 draw fresh air through the fan duct. After the fresh air passes through the counter-rotating axial flow fans 1, the temperature rises by about 5°C, and the temperature of the air reaching the first direct expansion combined cabinet 3 is about 37°C.

[0027] The cooling water circulation system includes a closed-loop cooling tower 8, cooling water pipes 9, a manifold 19, and a return pipe 28. A spray water circulation system is installed on the closed-loop cooling tower 8. One end of the cooling water pipe 9 is connected to the closed-loop cooling tower 8, and the other end is connected to three pumping units. All three pumping units are connected to the manifold 19. The manifold 19 is connected to two cooling branch pipes 20, which are respectively connected to the first refrigeration unit 6 and the second refrigeration unit 7, and respectively connected to the plate condensers of the first refrigeration unit 6 and the second refrigeration unit 7. One end of the return pipe 28 is connected to the closed-loop cooling tower 8, and the other end is connected to two return branch pipes 24, which are respectively connected to the first refrigeration unit 6 and the second refrigeration unit 7, and respectively connected to the plate condensers of the first refrigeration unit 6 and the second refrigeration unit 7. In this embodiment, the pumping unit transports the cooling water in the closed cooling tower 8 sequentially through the cooling water pipe 9, the manifold 19, and the cooling branch pipe 20 to the first refrigeration unit 6 and the second refrigeration unit 7. After heat exchange treatment, the cooling water returns to the closed cooling tower 8 through the return branch pipe 24 and the return pipe 28 for further processing. When the cooling water circulation system is in use, two pumping units are in operation, while the other pumping unit is on standby so that it can be replaced promptly if it is damaged.

[0028] The pumping unit includes a water branch pipe 14 connected to the cooling water pipe 9 and the manifold 19. A second water pump 15 is installed on the water branch pipe 14 to provide power for the delivery of cooling water. The water branch pipe 14 is also equipped with a second butterfly valve 16, a first check valve 17 and a third pressure gauge 18. In this embodiment, the second butterfly valve 16 can regulate the flow rate of cooling water delivered by the pumping unit, the first check valve 17 can prevent the cooling water from flowing back in the water branch pipe 14, and the third pressure gauge 18 can measure the pressure of the cooling water in the water branch pipe 14.

[0029] The cooling water pipe 9 is equipped with a first butterfly valve 901, a first pressure gauge 902, and a first temperature sensor 903. The cooling water pipe 9 also has a water filling unit, which includes a water supply pipe 10 connected to the cooling water pipe 9. The other end of the water supply pipe 10 is connected to a water source outside the mine. The water supply pipe 10 is equipped with a first shut-off valve 11, a second pressure gauge 12, and a first water pump 13. In this embodiment, the first butterfly valve 901 can regulate the flow rate of cooling water drawn from the closed cooling tower 8, the first pressure gauge 902 can measure the pressure of the cooling water drawn from the closed cooling tower 8, and the first temperature sensor 903 can measure the temperature of the cooling water drawn from the closed cooling tower 8. Before using this cooling system, the first water pump 13 and the first shut-off valve 11 are opened to transport cooling water from outside the mine to the cooling water pipe 9 via the water supply pipe 10, filling the cooling water pipe 9 to facilitate the use of the cooling water circulation system.

[0030] The cooling branch pipe 20 is equipped with a third butterfly valve 21, a fourth pressure gauge 22, and a second temperature sensor 23. A filter is also installed on the cooling branch pipe 20 to filter the cooling water. The return branch pipe 24 is equipped with a third temperature sensor 25, a fourth butterfly valve 26, and a fifth pressure gauge 27. The return pipe 28 is equipped with a fifth butterfly valve 29, a sixth pressure gauge 30, and a fourth temperature sensor 31. In this embodiment, the third butterfly valve 21 is used to regulate the cooling water flow rate in the cooling branch pipe 20, the fourth pressure gauge 22 is used to measure the cooling water pressure in the cooling branch pipe 20, and the second temperature sensor... Sensor 23 measures the temperature of the cooling water supplied by cooling branch pipe 20 to the first refrigeration unit 6 and the second refrigeration unit 7; third temperature sensor 25 measures the temperature of the cooling water after heat exchange; fourth butterfly valve 26 regulates the flow rate of cooling water in return branch pipe 24; fifth pressure gauge 27 measures the pressure of cooling water in return branch pipe 24; fifth butterfly valve 29 regulates the flow rate of cooling water returning to closed cooling tower 8; sixth pressure gauge 30 measures the pressure of cooling water returning to closed cooling tower 8; and fourth temperature sensor 31 measures the temperature of cooling water returning to closed cooling tower 8.

[0031] The spray water circulation system includes a circulating water pipe 37 and three circulating water pump units installed on the circulating water pipe 37. One end of the circulating water pipe 37 is connected to the water collection tank of the closed cooling tower 8, and the other end is connected to the spray pipe of the closed cooling tower 8. The three circulating water pump units are connected in parallel. When the spray water circulation system is in use, two circulating water pump units are in use, and the other circulating water pump unit is on standby. The circulating water pump unit includes a circulating branch pipe 38, on which a third water pump 40 is installed. The circulating branch pipe 38 is also equipped with a seventh pressure gauge 39, a second check valve 41, and a sixth butterfly valve 42. In this embodiment, pressure gauges, temperature sensors, and butterfly valves are installed at both ends of the circulating water pipe 37. The circulating water pump unit can pump the cooling water in the water collection tank of the closed cooling tower 8 to the spray pipe. The seventh pressure gauge 39 is used to measure the pressure of the cooling water pumped by the third water pump 40. The second check valve 41 prevents the cooling water from flowing back in the circulating branch pipe 38. The sixth butterfly valve 42 is used to adjust the cooling water flow rate of the circulating branch pipe 38.

[0032] The water replenishment system includes a softened water tank 32 and a softened water pipe 36. Both ends of the softened water pipe 36 are connected to the softened water tank 32 and the closed-loop cooling tower 8, respectively. A water pump, a shut-off valve, a pressure gauge, and a filter are installed on the softened water pipe 36. A water supply pipe 3201 and a drain pipe 33 are connected to the softened water tank 32. The other end of the water supply pipe 3201 is connected to a water source outside the mine. A shut-off valve is also installed on the water supply pipe 3201. When the water in the softened water tank 32 is low, a shut-off valve can be used to replenish the water. Water is supplied to the softened water tank 32 through the water supply pipe 3201. The other end of the drain pipe 33 is connected to two drain branch pipes 34. The two drain branch pipes 34 are respectively connected to the first direct expansion combined cabinet 3 and the second direct expansion combined cabinet 5. A second shut-off valve 35 is provided on the drain branch pipe 34. The water generated by the evaporators of the first direct expansion combined cabinet 3 and the second direct expansion combined cabinet 5 for heat exchange and cooling of fresh air can flow into the softened water tank 32 through the drain branch pipe 34 and the drain pipe 33 in sequence.

[0033] The working principle of this invention is as follows: Before use, open the first shut-off valve 11 and the first water pump 13 to deliver external water to the cooling water pipe 9 through the water supply pipe 10, filling the cooling water pipe 9 with water; during use, two counter-rotating axial flow fans 1 deliver fresh air through the first air duct 2 to the first direct expansion unit 3. After the fresh air passes through the counter-rotating axial flow fans 1, the temperature rises by about 5°C. The inlet temperature of the first direct expansion unit 3 is about 37°C (dry bulb temperature) and the relative humidity is 64.4%. The first direct expansion unit 3 works in conjunction with the first refrigeration unit 5 to cool the fresh air to about 27°C after the first stage of cooling and to about 20°C after the second stage of cooling. During the cooling process, the compressor compresses the gaseous refrigerant into a high-temperature, high-pressure gaseous state and delivers it to the plate type. The condenser exchanges heat with the cooling water supplied by the cooling water circulation system for cooling, and after cooling, it becomes a medium-temperature, high-pressure liquid refrigerant. Then, after being filtered and dehumidified by the dryer filter, it is transported to the evaporator through pipelines. After being processed by the throttling valve, it is depressurized and becomes a low-temperature, low-pressure liquid refrigerant. It absorbs heat from the fresh air through the evaporator, thus lowering the temperature of the fresh air for the first time. During this process, the pumping unit transports the cooling water in the closed cooling tower 8 to the plate condenser in sequence through the cooling water pipe 9, water branch pipe 14, manifold 19 and cooling branch pipe 20, where it exchanges heat to remove the heat absorbed by the refrigerant from the fresh air. Then, it flows back to the closed cooling tower 8 through the return branch pipe 24 and return pipe 28, where the closed cooling tower 8 is used to treat the cooling water after heat exchange.

[0034] The fresh air, after undergoing primary cooling treatment by the first direct expansion unit 3, is then transported to the second direct expansion unit 5 via the second air duct 4. In conjunction with the second refrigeration unit 7, the fresh air undergoes secondary cooling treatment, and the outlet temperature of the second direct expansion unit 5 is approximately 10°C (dry bulb temperature). Finally, the fresh air is transported to the excavation face via the third air duct 501 to cool and dehumidify the excavation face. The water generated by the evaporators of the first and second direct expansion units 3 and 5 through heat exchange and cooling of the fresh air flows into the softened water tank 32 via the drain branch pipe 34 and the drain pipe 33.

[0035] The embodiments described above are merely preferred embodiments of the invention and are not intended to limit the scope of the invention. Therefore, any equivalent changes or modifications made to the technical solutions described in the claims of this invention should be included within the scope of the patent application of this invention.

Claims

1. A new type of ventilation cooling system for deep well long distance mining working face, characterized in that, The application relates to a refrigeration cooling system, which comprises a double-rotor axial flow fan (1) and two refrigeration cooling systems, wherein one of the refrigeration cooling systems comprises a first direct expansion combined cabinet (3) and a first refrigeration main machine (6), the first direct expansion combined cabinet (3) is connected with the first refrigeration main machine (6) through a pipeline, the other refrigeration cooling system comprises a second direct expansion combined cabinet (5) and a second refrigeration main machine (7), and the second direct expansion combined cabinet (5) is connected with the second refrigeration main machine (7) through a pipeline. The double-rotor axial flow fan (1) is connected with a first air duct (2) at an air outlet, the first air duct (2) is connected with the first direct expansion combined cabinet (3), the tail of the first direct expansion combined cabinet (3) is connected with a second air duct (4) connected with the second direct expansion combined cabinet (5), and the tail of the second direct expansion combined cabinet (5) is connected with a third air duct (501). The application further comprises a cooling water circulating system connected with the first refrigeration main machine (6) and the second refrigeration main machine (7), and the cooling water circulating system is connected with a water supplementing system.

2. The new type ventilation cooling system for deep well long distance mining working face according to claim 1, characterized in that, The first direct expansion combined cabinet (3) and the second direct expansion combined cabinet (5) each comprise an evaporator and a throttling valve, and the first refrigeration main machine (6) and the second refrigeration main machine (7) each comprise a compressor, a plate condenser, a drying filter and an economizer.

3. The new type ventilation cooling system for deep well long distance mining working face according to claim 1, characterized in that, The number of the double-rotor axial flow fan (1) is two, and the double-rotor axial flow fan (1) is connected with a fan air duct at an air outlet, and the two fan air ducts are connected with the first air duct (2) in communication.

4. The new type ventilation cooling system for deep well long distance mining working face according to claim 1, characterized in that, The cooling water circulating system comprises a closed cooling tower (8), a cooling water pipeline (9), a converging pipeline (19) and a backflow pipeline (28), the closed cooling tower (8) is provided with a spraying water circulating system, one end of the cooling water pipeline (9) is connected with the closed cooling tower (8), the other end is connected with three pumping units, the three pumping units are connected with the converging pipeline (19), the converging pipeline (19) is connected with two cooling branch pipelines (20), the two cooling branch pipelines (20) are connected with the first refrigeration main machine (6) and the second refrigeration main machine (7) respectively, one end of the backflow pipeline (28) is connected with the closed cooling tower (8), the other end is connected with two backflow branch pipelines (24) in communication, and the two backflow branch pipelines (24) are connected with the first refrigeration main machine (6) and the second refrigeration main machine (7) respectively.

5. The new type ventilation cooling system of deep well long distance mining working face according to claim 4, characterized in that, The pumping unit comprises a water branch pipeline (14) connected with the cooling water pipeline (9) and the converging pipeline (19), the water branch pipeline (14) is provided with a second water pump (15), and the water branch pipeline (14) is further provided with a second butterfly valve (16), a first check valve (17) and a third pressure gauge (18).

6. The new type ventilation cooling system for deep mine long distance mining face according to claim 5, characterized in that, The cooling water pipeline (9) is provided with a first butterfly valve (901), a first pressure gauge (902) and a first temperature sensor (903), and the cooling water pipeline (9) is further provided with a water filling unit, the water filling unit comprises a water supplementing pipeline (10) connected with the cooling water pipeline (9), and the water supplementing pipeline (10) is provided with a first stop valve (11), a second pressure gauge (12) and a first water pump (13).

7. The new type ventilation cooling system for deep well long distance mining working face according to claim 4, characterized in that, The cooling branch pipe (20) is provided with a third butterfly valve (21), a fourth pressure gauge (22) and a second temperature sensor (23), the return branch pipe (24) is provided with a third temperature sensor (25), a fourth butterfly valve (26) and a fifth pressure gauge (27), and the return pipe (28) is provided with a fifth butterfly valve (29), a sixth pressure gauge (30) and a fourth temperature sensor (31).

8. The new type ventilation cooling system of deep well long distance mining working face according to claim 7, characterized in that, The spray water circulating system comprises a circulating water pipe (37) and three circulating water pump units arranged on the circulating water pipe (37), one end of the circulating water pipe (37) is communicated with the water collecting tank of the closed cooling tower (8), the other end is communicated with the spray pipe of the closed cooling tower (8), the three circulating water pump units are connected in parallel, and the circulating water pump unit comprises a circulating branch pipe (38), the circulating branch pipe (38) is provided with a third water pump (40), and the circulating branch pipe (38) is further provided with a seventh pressure gauge (39), a second check valve (41) and a sixth butterfly valve (42).

9. The new type ventilation cooling system for deep well long distance mining working face according to claim 4, characterized in that, The water supplement system comprises a softened water tank (32) and a softened water pipe (36), two ends of the softened water pipe (36) are connected with the softened water tank (32) and the closed cooling tower (8) respectively, the softened water tank (32) is communicated with a water delivery pipe (3201) and a drain pipe (33), the other end of the drain pipe (33) is communicated with two drain branch pipes (34), the two drain branch pipes (34) are connected with the first direct expansion combined cabinet (3) and the second direct expansion combined cabinet (5) respectively, and the drain branch pipe (34) is provided with a second stop valve (35).

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