High-temperature deep well coal seam water injection cooling mine cooling system

Abstract

The present application is a kind of high-temperature deep well coal seam water injection cooling mine cooling system, which is composed of water-cooled chiller, cleanable heat exchanger, water injection hole sealing device, cold water delivery and return hose, etc. The coal seam water injection cooling process is as follows: the water returned from the cooling water injection return pipe enters the heat exchanger to exchange cold energy and form cold water, which is pressurized by the cold water semi-circulating pump set and injected into the inlet pipe of the sealing device. Part of the cold water flows into the sealing device and the water injection hole through the expansion sealing inlet hole, which plays the role of sealing and water plugging, wetting coal body and cooling coal body. The remaining cold water flows to the end of the water injection hole through the cold water delivery hose, which plays the role of cooling and cooling the coal seam in the water injection hole and supplementing the loss of cold water in the coal seam. The cold water overflowing from the return hose returns to the heat exchanger again to exchange cold energy, realizing the circulation of cold supply. The mine cooling system has high cold energy utilization efficiency and can effectively solve the problems of high temperature of newly exposed coal body in deep mine, large heat dissipation of roadway and transportation coal block, and poor cooling effect of working face.

Description

TECHNICAL FIELD

[0001] The present application relates to a coal mine underground cooling system, in particular to a high-geothermal deep well coal seam water injection cooling mine cooling system. BACKGROUND

[0002] According to the China Statistical Yearbook in 2017, China's total coal production in 2015 was 37.46 billion tons, consumption was 39.7 billion tons, accounted for 62.7% in primary energy consumption, and the energy structure was still dominated by coal. However, with the gradual decrease of shallow coal resources, the mining depth of the mine is gradually increasing. Studies have shown that the temperature of the geothermal constant zone is about 15℃-17℃, and the average temperature of the geothermal zone below it increases by 2.4-4.2℃ / 100m. Therefore, when the depth of the mine exceeds 800m, even the normal geothermal increase will make the mine heat damage abnormal. In order to ensure the safety of underground production and the physical and mental health of the workers, cooling measures should be taken for the production working face with high temperature and high humidity.

[0003] For deep mining high-geothermal heat damage mines, ventilation measures cannot meet the cooling requirements of the mining working face, and artificial refrigeration cooling measures are needed. The usual centralized refrigeration cooling, local cooling of the working face and other ways have good effects on the cooling of the high-temperature heat damage working face of the mine. However, with the increase of the depth of the working face, the temperature of the original rock and coal seam is high, the heat dissipation is intense, the air supply of the working face quickly reaches thermal equilibrium with the newly exposed coal seam and the broken coal after mining, and the cooling load increases sharply. In addition to the heat dissipation of mechanical and electrical equipment, the heat dissipation and oxidation of the coal seam in the goaf, the high temperature and high humidity of the air in the underground mining working face, although the direct air cooling and dehumidification cooling method can alleviate the high temperature heat damage phenomenon in the mine to some extent, but compared with the current situation of deep mining high-geothermal, large cooling load and fast cooling loss, the cooling effect of the conventional cooling method is difficult to guarantee.

[0004] In addition to the mine cooling, dust reduction measures are also needed in the production process of the high-geothermal mining working face, and coal seam water injection dust reduction is one of the important measures. Although general coal seam water injection also has a cooling effect on the coal seam and has some influence on the working face, for deep or super-deep wells with large depth and high geothermal, the cooling temperature of the coal body is extremely low by non-circulating cold water injection, and the cooling effect on the heat damage environment of the deep mining working face is very small. SUMMARY

[0005] In view of the above problems existing in the current mine cooling equipment, in order to alleviate the heat damage of high-geothermal deep well mines, the present application provides a high-geothermal deep well coal seam water injection cooling mine cooling system.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] This invention proposes a high-temperature deep coal seam water injection cooling mine cooling system, which mainly consists of a high-pressure resistant and cleanable coal seam water injection cooling heat exchanger, a circulating water injection sealing device, a water-cooled chiller unit, a water supply tank, a coal seam cooling water injection supply and return main pipe, a coal seam cooling water injection supply and return hose, a coal seam cooling water injection return filter assembly, a water circulation pump set, and a pressurized water supply pump set.

[0008] The described high-temperature deep coal seam water injection cooling mine cooling system has the following process flow: Water returning from the coal seam cooling water injection main pipe enters a heat exchanger for heat exchange. After being cooled, it flows out from the cooling water injection supply main pipe and is then pressurized by the coal seam cooling water injection high-pressure cold water circulation pump set before entering the inlet pipe of the sealing device. A portion of the cold water enters the sealing device and injection hole through the expansion sealing inlet of the injection pipe, serving to seal the hole, wet the coal body, and cool the coal body. Another portion of the cold water flows directly to the end of the injection hole through the cold water delivery hose, serving to cool the coal seam water injection in the injection hole and replenish the cold water consumed by the coal seam water injection. Water overflowing from the cold water return hose returns to the cold water return interface pipe of the sealing device, and merges with other coal seam cooling and cooling injection water return water into the main return water pipe. After passing through the return water filter assembly, it enters the heat exchanger to be cooled. The resulting cold water is then pressurized and transported to the coal seam cooling and cooling injection hole by the high-pressure cold water semi-circulation pump group, thus achieving the purpose of coal seam water injection and cooling.

[0009] The described high-temperature deep coal seam water injection cooling mine cooling system uses a water-cooled chiller unit to produce chilled water, which is pressurized by a low-pressure chilled water circulation pump unit and enters a heat exchanger. Inside the U-shaped heat exchange tubes on the low-pressure side of the heat exchanger, the chilled water exchanges cooling capacity with the high-pressure coal seam injection water outside the heat exchange tubes and inside the heat exchange cylinder. After the chilled water temperature on the low-pressure side rises, it returns to the water-cooled chiller unit, where it is cooled in the chiller unit's evaporator. Under the pressure of the chilled water circulation pump unit, it returns to the heat exchanger, achieving continuous cooling. Simultaneously, the cooling water circulation pump unit delivers cooling water to the condenser of the water-cooled chiller unit, where it absorbs refrigeration heat and its temperature rises. This condensation heat is then promptly dissipated by the refrigeration heat dissipation device, ensuring continuous cooling operation of the chiller unit.

[0010] The described high-temperature deep coal seam water injection cooling mine cooling system comprises a high-pressure resistant and cleanable coal seam water injection cooling heat exchanger consisting of a heat exchanger shell, heat exchanger coils, and heat exchanger end caps. The heat exchanger coils are composed of longitudinal horizontal baffles, "U"-shaped heat exchange tubes, crossflow baffles, longitudinal horizontal baffles inside the shell, and "U"-shaped heat exchange tube end plates. The crossflow baffles act as longitudinal water flow deflectors; the longitudinal horizontal baffles act as vertical flow dividers for the coal seam water injection cooling water within the heat exchanger shell, extending the water flow path and enhancing heat exchange.

[0011] The described high-temperature deep coal seam water injection cooling mine cooling system comprises a circulating water injection and sealing device consisting of inlet and outlet water valves, a sealing device inlet pipe, a sealing device, a coal seam cooling water injection cold water supply hose, a coal seam cooling water injection cold water return hose, a water injection and sealing device cold water return interface pipe, a sealing device cold water supply interface pipe, an expansion sealing and coal seam water injection inlet pipe, a short inlet pipe, a cold water return interface pipe hose connecting corrugated pipe, an expansion sealing inlet hole, and a sealing device cold water supply interface pipe hose connecting corrugated pipe. Components that do not require disassembly or assembly are connected by welding; components requiring disassembly are connected by high-strength flanges.

[0012] The described high-temperature deep coal seam water injection cooling mine cooling system has a raw water supply for coal seam water injection stored in a water supply tank. The water outlet pipe on the upper right side of the water supply tank is pressurized by a pressurized water supply high-pressure pump set and fed into the heat exchanger to replenish the cold water consumed by coal seam water injection and cooling, while also stabilizing the coal seam water injection pressure. The water outlet pipe on the lower right side of the water supply tank is fed into the chilled water circulation system through a chilled water circulation system water supply constant pressure pump set and fed into the circulating chilled water system between the water-cooled chiller unit and the heat exchanger, thus maintaining the pressure of the chilled water circulation system.

[0013] The described high-temperature deep coal seam water injection cooling mine cooling system includes: cold water provided by other cold sources enters a heat exchanger, and the cold water exchanges cold energy with the high-pressure coal seam water injected into the outside of the heat exchanger tube and the heat exchange cylinder inside the "U"-shaped heat exchange tube on the low-pressure side of the heat exchanger. After the temperature of the cold water on the low-pressure side rises, it returns to other cold sources, realizing continuous cooling by utilizing other available coal seam water injection cooling cold sources.

[0014] The described high-temperature deep coal seam water injection cooling mine cooling system has its cooling equipment arranged in underground roadways or chambers, with water injection holes arranged parallel to each other in the normal pressure zone of the coal body in front of the working face.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0016] After being cooled by the underground heat exchanger, the cold water is pressurized by the cooling and cooling water injection circulation pump set and flows into the water injection hole. Under the action of high-pressure water static pressure, the cold water in the borehole and the cold water that seeps into the coal seam pores directly cool the coal seam. At the same time, the semi-circulating cold water continuously provides continuous cooling capacity for the coal seam, resulting in high cooling capacity utilization efficiency and significant coal seam water injection cooling effect.

[0017] The water in the cooling water injection and return main pipe inevitably contains some silt. The coal seam cooling water injection and return filter assembly reduces the silt content carried by the water. The high-pressure resistant and cleanable coal seam water injection cooling heat exchanger is easy to clean, maintain, and repair, preventing dirt blockage and affecting heat exchange, ensuring the heat exchanger's heat exchange efficiency, and also helping to increase the service life and operational safety of the equipment.

[0018] Coal seam water injection cooling combines the advantages of both coal seam water injection and mine cooling systems. It also has the dual functions of water injection dust prevention and mine cooling, effectively simplifying the equipment system of the mining face and reducing initial investment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the high-temperature deep coal seam water injection cooling mine cooling system described in this invention.

[0020] Figure 2 This is a schematic diagram of the cold water circulation cooling coal seam water injection pipe and connecting pipe according to the present invention.

[0021] Figure 3 This is a disassembly diagram of the cold water circulation cooling coal seam water injection pipe connection structure according to the present invention.

[0022] Figure 4 This is a plan view of the heat exchanger described in this invention.

[0023] Figure 5 This is a front elevation view of the heat exchanger described in this invention.

[0024] Figure 6 This is a structural diagram of the heat exchanger assembly according to the present invention.

[0025] Figure 7 This is a cross-sectional view of the heat exchanger 1-1 described in this invention.

[0026] Figure 8 This is a cross-sectional view of the heat exchanger 2-2 described in this invention.

[0027] Figure 9 This is a cross-sectional view of the heat exchanger described in this invention, section 3-3.

[0028] Figure 10 This is a cross-sectional view of the heat exchanger described in this invention, section 4-4.

[0029] Figure 11 This is a schematic diagram of the arrangement of the high-pressure side water flow baffles in the heat exchanger described in this invention.

[0030] In the diagram: 1. (High-pressure resistant, cleanable coal seam water injection and cooling) heat exchanger; 2. Circulating water injection and sealing device; 3. Water-cooled chiller unit; 4. Low-pressure chilled water circulation pump unit; 5. Cooling water circulation pump unit; 6. Coal seam cooling and temperature reduction water injection high-pressure chilled water semi-circulation pump unit; 7. Cooling and temperature reduction water injection main pipe; 8. Sealing device inlet pipe; 9. Sealer; 10. Water injection hole; 11. Cold water supply hose; 12. Cold water return hose; 13. Cold water return interface pipe; 14. Cooling and temperature reduction water injection and return main pipe; 15. Coal seam cooling and temperature reduction water injection and return filter assembly; 16. Pressurized water supply high-pressure pump unit; 17. Water supply tank; 18. Chilled water circulation system water supply constant pressure pump unit; 19. Inlet and outlet water valves; 20. Sealing device cold water supply interface pipe; 21. Expansion sealing and coal seam water injection inlet pipe; 22. Inlet pipe. 23. Short pipe, 24. Cold water return interface pipe, 25. Corrugated pipe connecting hose, 26. Water inlet of water injection pipe expansion seal, 27. Corrugated pipe connecting hose of sealing device cold water supply interface, 28. Flange, 29. Heat exchanger shell, 30. "U"-shaped heat exchange tube, 31. Heat exchanger end cover, 32. Crossflow baffle inside heat exchanger shell, 33. Longitudinal horizontal dividing baffle inside shell, 34. Baffle inside end cover, 35. "U"-shaped heat exchange tube end plate, 36. Flange at the end of heat exchange tube shell, 37. Flange plate at end cover, 38. Chilled water inlet, 39. Chilled water outlet, 40. Circulating water return pipe interface, 41. Circulating water supply pipe interface, 42. Air vent valve interface on the water injection side of heat exchanger, 43. Safety valve interface on the water injection side of heat exchanger, 44. Pressure gauge interface on the water injection side of heat exchanger, 45. Drain valve interface on the water injection side of heat exchanger. Detailed Implementation

[0031] To better understand this invention, the following description is provided in conjunction with the appendix to the specification. Figures 1-11 The refrigeration process flow, coal seam cooling water injection cooling process flow, heat exchanger 1, and circulating water injection sealing device 2 of the present invention will be further described.

[0032] The refrigeration process of a water-cooled chiller unit is as follows: Figure 1 As shown, the cooling water circulation pump set 5 of the water-cooled chiller unit delivers cooling water to the condenser of the water-cooled chiller unit 3 to achieve refrigeration, condensation, and heat dissipation. The chilled water produced by the water-cooled chiller unit 3 is pressurized by the low-pressure chilled water circulation pump set 4 and enters the heat exchanger 1. In the "U"-shaped heat exchange tube 28 on the low-pressure side of the heat exchanger, the chilled water exchanges cooling capacity with the high-pressure coal seam injection water on the outside of the heat exchange tube and inside the heat exchange cylinder. The temperature of the chilled water on the low-pressure side rises, and it returns to the water-cooled chiller unit 3. It is cooled down in the evaporator of the chiller unit and returns to the heat exchanger under the pressurization of the low-temperature chilled water circulation pump set, thus achieving continuous cooling.

[0033] The coal seam water injection cooling process is as follows: Figure 1 , 2As shown in Figure 3: Water returning from the coal seam cooling water injection pipe flows outside the "U"-shaped heat exchange tube inside the heat exchanger 1 shell. After being cooled, it flows out from the coal seam cooling water injection main pipe 7. After being pressurized by the coal seam cooling water injection high-pressure cold water semi-circulation pump group 6, the coal seam cooling water injection enters the sealing device inlet pipe 8 of the circulating water injection sealing device 2. Part of the cooling water enters the sealing device 9 through the water injection pipe expansion sealing inlet 24, which serves to seal and fix the water injection pipe; the rest enters the water injection hole 10, which serves to wet and cool the coal body. Another part of the water does not pass through the inlet 24, but directly enters the cold water supply hose 11 and flows to the end of the water injection hole 10, which serves to cool the coal seam injection cold water in the water injection hole 10 and replenish the cold water consumed by the coal seam injection. Water overflowing from the cold water return hose 12 returns to the cold water return interface pipe 13 of the sealing device, and merges with other coal seam cooling water return water into the main return water pipe 14. Then, the return water is filtered by the return water filter assembly 15 to prevent the mud and sand brought back by the water injection hole from entering the water injection cooling heat exchanger 1. The filtered, higher-temperature return water enters the water injection cooling heat exchanger 1 again and is cooled down. It is then pressurized by the cooling water circulation pump set 6 and delivered to the coal seam cooling water injection hole 10 to meet the coal seam water injection and cooling needs.

[0034] High-pressure resistant and cleanable coal seam water injection cooling heat exchanger 1 Figures 4 to 11 As shown, the heat exchanger consists of a heat exchanger shell 27, heat exchanger coils, and heat exchanger end caps 29. The heat exchanger coils are composed of a longitudinal horizontal dividing baffle 31, "U"-shaped heat exchanger tubes 28, a crossflow baffle 32, and "U"-shaped heat exchanger tube end plates 33. The heat exchanger end caps have pre-installed chilled water inlet 36 and chilled water outlet 37. The heat exchanger shell 27 has pre-installed interfaces for a vent valve 40 on the water injection side, a safety valve 41 on the water injection side, a pressure gauge 42 on the water injection side, and a drain valve 43 on the water injection side. These interfaces are fixed to the heat exchanger coils and end caps 29 using the "U"-shaped heat exchanger tube end plates 33 and the heat exchanger shell end flanges 34. When the heat exchanger needs cleaning, the end caps 29 are removed, and the end plates, "U"-shaped heat exchanger tubes, and baffle assembly are pulled apart to clean the inside of the shell and the coils. Figure 6 .

[0035] The foregoing has shown and described the composition of the cooling system, the refrigeration process flow, the water injection cooling process flow, system features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature deep coal seam water injection cooling mine cooling system, mainly composed of a heat exchanger (1), a circulating water injection sealing device (2), a water-cooled chiller unit (3), a coal seam cooling water supply main pipe (7) and a coal seam cooling water return main pipe (14), a coal seam cold water supply hose (11) and a cold water return hose (12), a water replenishment tank (17), a coal seam cooling water injection and return filter assembly (15), a water circulation pump set and a pressurized water replenishment pump set; The water-cooled chiller unit (3) is connected to the heat exchanger (1) via the low-pressure chilled water circulation pump unit (4). The heat exchanger (1) is connected to the coal cooling and cooling water supply main pipe (7) in sequence to the coal cooling and cooling water injection high-pressure chilled water semi-circulation pump unit (6) and the coal cooling water supply hose (11) inside the circulating water injection sealing device (2). The circulating water injection sealing device (2) is connected to the coal cooling and cooling water injection return water filter assembly (15) and the heat exchanger (1) in sequence via the chilled water return water hose (12) and the coal cooling and cooling water return main pipe (14). The water tank (17) is connected to the heat exchanger (1) via the pressurized water supply high-pressure pump unit (16) and to the water-cooled chiller unit (3) via the chilled water circulation system water supply constant pressure pump unit (18). The heat exchanger (1) consists of three parts: heat exchanger shell (27), heat exchanger coil and heat exchanger end cover (29); the heat exchanger coil consists of "U"-shaped heat exchange tube (28), crossflow baffle (30), longitudinal horizontal dividing baffle (31) and "U"-shaped heat exchange tube end plate (33); the crossflow baffle (30) serves to deflect the longitudinal water flow; the longitudinal horizontal dividing baffle (31) serves to divide the coal seam injection cold water in the heat exchanger shell into upper and lower streams, extend the water flow path, and enhance the cold exchange effect; The cooling water circulation pump group (5) delivers cooling water to the condenser of the water-cooled chiller unit (3). The chilled water produced by the water-cooled chiller unit (3) is pressurized by the low-pressure chilled water circulation pump group (4) and enters the heat exchanger (1). The chilled water in the "U"-shaped heat exchange tube (28) on the low-pressure side of the heat exchanger (1) exchanges cold energy with the high-pressure coal seam injection water on the outside of the heat exchange tube and inside the heat exchange shell. After the temperature of the chilled water on the low-pressure side rises, it returns to the water-cooled chiller unit (3) and is cooled down in the evaporator of the chiller unit. Under the pressure of the low-temperature chilled water circulation pump group (4), it returns to the heat exchanger (1) to achieve continuous cooling.

2. The high-temperature deep coal seam water injection cooling mine cooling system according to claim 1, characterized in that: Water returning from the coal seam cooling and cooling return water main (14) enters the heat exchanger (1) for heat exchange. After being cooled, it flows out from the coal seam cooling and cooling supply water main (7) and is then pressurized by the coal seam cooling and cooling injection high-pressure cold water semi-circulation pump group (6) and injected into the sealing device inlet pipe (8). Part of the cold water flows into the sealing device (9) and the injection hole (10) through the expansion sealing hole inlet hole, which plays the role of sealing and blocking water, wetting the coal body and cooling the coal body. Another part of the cold water flows from the cold water supply hose (11) to the end of the injection hole (10), which plays the role of purifying the water inside the injection hole. The cold water serves to cool down and replenish the water consumed by coal seam injection. The water overflowing from the cold water return hose (12) returns to the cold water return interface pipe (13) of the sealing device, and merges with other coal seam cooling water return water into the coal seam cooling water return main pipe (14). Then, it passes through the coal seam cooling water return filter assembly (15) and enters the heat exchanger (1) to be cooled. The resulting cold water is pressurized again by the coal seam cooling water injection high-pressure cold water semi-circulation pump group (6) and transported to the coal seam cooling water injection hole (10) to achieve the purpose of coal seam water injection and cooling.

3. The high-temperature deep coal seam water injection cooling mine cooling system according to claim 1, characterized in that: The circulating water injection sealing device (2) consists of inlet and outlet water valves (19), sealing device inlet pipe (8), sealing device (9), cold water supply hose (11), cold water return hose (12), sealing device cold water return interface pipe (13), sealing device cold water supply interface pipe (20), expansion sealing and coal seam water injection inlet pipe (21), inlet pipe short pipe (22), cold water return interface pipe hose connection corrugated pipe (23), water injection pipe expansion sealing inlet hole (24), cold water supply interface pipe hose connection corrugated pipe (25). The components that do not need to be disassembled and assembled are connected by welding; the components that need to be disassembled are connected by high-strength flanges (26). The two ends of the inlet and outlet water valve (19) are connected to the coal seam cooling and cooling water supply main pipe (7) and the inlet pipe short pipe (22) respectively. The other end of the inlet pipe short pipe (22) is connected to the sealing device cold water supply interface pipe (20) through the sealing device inlet pipe (8). The side of the sealing device cold water supply interface pipe (20) is provided with the water injection pipe expansion sealing inlet hole (24). The outer side of the sealing device cold water supply interface pipe (20) is sequentially fitted with the expansion sealing and coal seam water injection inlet pipe (21) and the sealing device (9). The sealing device (9) and the expansion sealing and coal seam water injection inlet pipe (21) both cover the water injection pipe expansion sealing inlet hole (24). A corrugated pipe (25) connecting the cold water supply interface pipe (20) of the sealing device and the cold water delivery hose (11) is provided. The cold water return hose (12) is located inside the cold water delivery hose (11) and the cold water supply interface pipe (20) of the sealing device. One end of the cold water return hose (12) near the coal seam cooling water supply main pipe (7) is connected to the cold water return interface pipe (13) of the sealing device through the corrugated pipe (23). The other end of the cold water return interface pipe (13) of the sealing device is connected to the coal seam cooling water return main pipe (14) through the inlet and outlet water valve (19).

4. The high-temperature deep coal seam water injection cooling mine cooling system according to claim 1, characterized in that: The raw water for coal seam injection is stored in the water tank (17). The water outlet pipe on the upper right side is connected to the pressurized water supply pump group (16) to replenish the cold water consumed by coal seam injection and cooling, and at the same time, it has the function of stabilizing the coal seam injection pressure. The water outlet pipe on the lower right side is supplied by the chilled water circulation system water supply constant pressure pump group (18) to the chilled water circulation system between the water-cooled chiller unit (3) and the heat exchanger (1) to replenish the chilled water circulation system and maintain the pressure.

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