Underground coal mine filtering type secondary spraying dust removal device and spraying dust removal method thereof

Abstract

The invention belongs to the technical field of coal mine environment purification, and relates to an underground coal mine filtering type secondary spraying dust removal device and a spraying dust removal method thereof. The device comprises a first branch and a second branch, the first branch comprises an air inlet steel pipe, an air quality filter and a first-stage ultrasonic spraying rod; the tail end of the air inlet steel pipe is connected with a first air inlet branch and a second air inlet branch, and the tail end of the first air inlet branch is connected with a first-stage ultrasonic spraying rod; the first-stage ultrasonic spraying rod comprises a plurality of ultrasonic nozzles; the second branch comprises a water inlet steel pipe, a water quality filter and a secondary cloud spray rod, the tail end of the water inlet steel pipe is connected with a first water inlet branch and a second water inlet branch, and the tail end of the first water inlet branch is connected with a gas conveying pipeline; and the second air inlet branch and the second water inlet branch are connected with the secondary cloud and mist spraying rod. The problems that traditional spraying is low in respiratory dust trapping effect, prone to blockage, difficult to maintain and capable of wetting the ground are solved.

Description

Technical Field

[0001] This invention belongs to the field of coal mine environmental purification technology, specifically relating to a coal mine underground filter-type two-stage spray dust removal device and its spray dust removal method. Background Technology

[0002] With the continuous advancement of industrialization and the increasing mechanization of coal mine production, the number of dust-generating points in coal mines is increasing, and the dust concentration is rising steadily, significantly increasing the difficulty of dust control underground. Respiratory dust, which can cause pneumoconiosis in coal miners, is particularly challenging to control. Meanwhile, due to the poor quality of water used for dust control in coal mines, traditional full-section spray systems in underground roadways are prone to rapid clogging of nozzles by impurities after being put into use, drastically shortening their effective spraying time and ultimately causing them to lose their atomization and dust-collecting function. Furthermore, traditional nozzles have a short lifespan and are difficult to replace and maintain; often, the entire spray system needs to be replaced after clogging occurs. These nozzles rely solely on water pressure for atomization, producing large droplet sizes. A large number of coarse droplets directly impact the roadway floor or mining area, easily leading to slippery and wet roadways, which adversely affects safe production.

[0003] In summary, traditional spray devices not only have low efficiency in capturing respirable dust, but also suffer from problems such as easy clogging, difficult maintenance, and making the work area slippery with water. Summary of the Invention

[0004] The purpose of this invention is to provide a two-stage spray dust removal device and method for underground coal mine filtration, which solves the problems of low collection efficiency of traditional spray for respirable dust, as well as easy clogging, difficult maintenance, and wet ground.

[0005] This invention is achieved through the following technical solution: This invention discloses a two-stage spray dust removal device for underground coal mines, comprising a first branch and a second branch; The first branch includes an air intake steel pipe, an air quality filter, and a primary ultrasonic spray bar; The air quality filter is installed on the air inlet steel pipe. The end of the air inlet steel pipe is connected to the first air inlet branch and the second air inlet branch. The end of the first air inlet branch is connected to the first-stage ultrasonic spray bar. The first-level ultrasonic spray bar includes an air inlet main rod body, an air supply pipeline, and multiple ultrasonic nozzles. Multiple pneumatic quick connectors are installed on the air supply pipeline. The air inlet of each pneumatic quick connector is connected to the air inlet main rod body, and the air outlet is connected to an ultrasonic nozzle. The second branch includes an inlet steel pipe, a water filter, and a secondary mist spray bar. The water filter is installed on the inlet steel pipe. The end of the inlet steel pipe is connected to the first inlet branch and the second inlet branch. The end of the first inlet branch is connected to the gas pipeline. The second air intake branch and the second water intake branch are connected to the secondary cloud spray bar; The secondary cloud and mist spray bar includes a cloud and mist air intake main bar, a cloud and mist water intake main bar, and multiple cloud and mist nozzles; Multiple PB pneumatic quick-connect tees are installed on the main body of the cloud and mist air intake and the main body of the cloud and mist water intake, and each PB pneumatic quick-connect tee is connected to a cloud and mist nozzle.

[0006] Furthermore, the air inlet steel pipe is divided into three sections: stainless steel pipe A, stainless steel pipe B, and stainless steel pipe C. A shut-off valve A is installed at the front end of stainless steel pipe A, a pressure regulating valve A is installed between stainless steel pipe A and stainless steel pipe B, and an air quality filter is installed between stainless steel pipe B and stainless steel pipe C.

[0007] Furthermore, the end of the stainless steel pipe C is connected to a Y-type tee A. The other two outlets of the Y-type tee A are respectively connected to the inlet ends of the high-pressure hose A, which serves as the first air intake branch, and the high-pressure hose B, which serves as the second air intake branch. The outlet end of the high-pressure hose A is connected to a T-type tee, and one outlet of the T-type tee is connected to the first-stage ultrasonic spray bar.

[0008] Furthermore, the other outlet of the T-shaped tee is connected to the high-pressure hose E, and the other end of the high-pressure hose E is connected to the end of the air intake main body, forming air intake paths on both sides.

[0009] Furthermore, the inlet steel pipe is divided into three sections: stainless steel pipe D, stainless steel pipe E, and stainless steel pipe F. A shut-off valve B is installed at the front end of stainless steel pipe D, a pressure regulating valve B is installed between stainless steel pipe D and stainless steel pipe E, and a water filter is installed between stainless steel pipe E and stainless steel pipe F.

[0010] Furthermore, the end of the stainless steel pipe F is connected to a Y-type tee B, and the other two outlets of the Y-type tee B are respectively connected to the inlet end of the high-pressure hose C, which serves as the first water inlet branch, and the high-pressure hose D, which serves as the second water inlet branch. The outlet end of high-pressure hose C is connected to the air supply line to supply water to the ultrasonic nozzle; the outlet end of high-pressure hose D is connected to the secondary cloud spray bar, and the outlet end of high-pressure hose B is connected to the secondary cloud spray bar.

[0011] Furthermore, both the air intake main rod and the water intake main rod are equipped with shut-off valves.

[0012] Furthermore, the air quality filter and water quality filter are installed inside the air and water filter box.

[0013] Furthermore, inlet and outlet holes are installed on the feng shui filter box according to the location of the pipeline.

[0014] The present invention also discloses a spray dust removal method for the underground coal mine filter-type two-stage spray dust removal device, comprising the following steps: The dust-proof air is filtered through the air quality filter before entering the first air intake branch; The dust-proof water is filtered through a water filter before entering the first water inlet branch. The first air intake branch sends the filtered gas through the main air intake rod and into multiple ultrasonic nozzles on the air supply pipeline. At the same time, the first water intake branch sends the filtered water into multiple ultrasonic nozzles on the air supply pipeline. The ultrasonic atomized droplets cross the entire tunnel, forming a full-section fine mist droplet coverage area. Thus, the first-stage spray dust removal is completed. The second air intake branch and the second water intake branch are activated. The second air intake branch sends the filtered gas into the cloud and mist air intake main body and into the cloud and mist nozzle. At the same time, the second water intake branch sends the filtered water into the cloud and mist water intake main body and into the cloud and mist nozzle. The cloud and mist nozzle atomizes the air, and the droplet size after air atomization reaches the micron level, which captures and settles the respirable dust that cannot be captured by the first-stage spray, thus completing the second-stage spray dust removal.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: This invention discloses a two-stage spray dust removal device for underground coal mines. The dust removal process involves first filtering, then removing all dust, and finally removing respirable dust. Because air pressure is introduced into this spray system, the water pressure requirement of the device is significantly reduced. Both the primary and secondary sprays rely on air pressure to repeatedly impact and collide with the dust-suppressing water, and the dust-suppressing water body is subjected to various wall shear forces. Under the combined action of these factors, the dust removal system can reduce the particle size of the dust-suppressing water to the 10μm level. The mist particles at this level can overcome a certain amount of interfacial tension, and in engineering practice, they exhibit good encapsulation and collection efficiency for respirable dust.

[0016] Considering the water quality requirements for dust suppression and the service life of the nozzles, a pre-filter is installed before the dust suppression water and air enter the spray system. This effectively filters impurities in the spray water and air, thus extending the service life of the spray system. After filtration, the dust suppression water and air first enter the primary spray system, which is a dust suppression device mainly composed of ultrasonic nozzles. The ultrasonically atomized droplets cross the entire tunnel, forming a full-section fine droplet coverage area, capturing and suppressing all dust. After the primary spray system comes the secondary spray system, which mainly uses cloud nozzles to atomize the air. The droplet size after air atomization reaches 10μm, capturing and settling respirable dust that the primary spray system cannot capture. Moreover, droplets of this size have extremely strong diffusion, which can spread 10~30m into the tunnel with the airflow and remain suspended in the tunnel for a long time, achieving the purpose of strong dust suppression and long-term dust control. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a filter-type two-stage dust removal spray dust removal device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the housing of an air quality filter according to an embodiment of the present invention.

[0018] 101. Gate valve A; 102. Gate valve B; 103. Gate valve C; 104. Gate valve D; 21. Stainless steel pipe A; 22. Stainless steel pipe B; 23. Stainless steel pipe C; 24. Stainless steel pipe D; 25. Stainless steel pipe E; 26. Stainless steel pipe F; 31. Pressure regulating valve A; 32. Pressure regulating valve B; 4. Air filtration box; 5. Air quality filter; 6. Water quality filter; 71. Check valve A; 72. Check valve B; 81. Y-type tee A; 82. Y-type tee B; 91. High-pressure hose A; 92. High-pressure hose B; 93. High-pressure hose C; 94. High-pressure hose D; 95. High-pressure hose E; 10. T-type tee; 11. First-stage ultrasonic spray bar; 12. Ultrasonic nozzle; 13. Air supply pipeline; 14. PB pneumatic quick-connect tee; 15. PL pneumatic quick-connect elbow; 16. Cloud nozzle; 17. Cloud air inlet main rod body; 18. Cloud water inlet main rod body. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "placement," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] The following is for reference. Figures 1-2 This invention describes a two-stage spray dust removal device for underground coal mines, which is suitable for spray dust removal in underground coal mines.

[0023] like Figure 1 As shown, the present invention discloses a two-stage spray dust removal device for underground coal mines, comprising two branches: a first branch and a second branch.

[0024] The first branch includes an air inlet steel pipe, an air quality filter 5, and a primary ultrasonic spray bar. The air inlet steel pipe is divided into three sections: stainless steel pipe A21, stainless steel pipe B22, and stainless steel pipe C23. A shut-off valve A101 is installed at the front end of stainless steel pipe A21. A pressure regulating valve A31 is installed between stainless steel pipe A21 and stainless steel pipe B22. The air quality filter 5 is installed between stainless steel pipe B22 and stainless steel pipe C23. A Y-type tee A81 is connected to the end of stainless steel pipe C23. The other two outlets of Y-type tee A81 are connected to the inlet ends of high-pressure hose A91 and high-pressure hose B92, respectively. The outlet end of high-pressure hose A91 is connected to T-type tee 10. One outlet of T-type tee 10 is connected to the primary ultrasonic spray bar.

[0025] Specifically, such as Figure 1 As shown, the primary ultrasonic spray bar includes an air inlet main body 11, ultrasonic nozzles 12, an air supply pipeline 13, a PB pneumatic quick-connect tee 14, and a PL pneumatic quick-connect elbow 15. Multiple ultrasonic nozzles 12 are installed below the air inlet main body 11, and the ultrasonic nozzles 12 are connected to each other through the air supply pipeline 13.

[0026] The air inlet end of the ultrasonic nozzle 12 is connected to the air inlet main rod 11 by a threaded connection, and the air inlet end of the air inlet main rod 11 is connected to one end of the T-shaped tee 10 by a quick connection. The ultrasonic nozzle 12 is connected to a PB pneumatic quick-connect tee 14, and the ultrasonic nozzle 12 is connected to the gas supply pipeline 13 through the PB pneumatic quick-connect tee 14.

[0027] The PB pneumatic quick-connect tee 14 is divided into an inlet end and an outlet end; the inlet end of the PB pneumatic quick-connect tee 14 closest to the T-shaped tee 10 serves as the inlet end of the first-stage ultrasonic spray bar; the outlet end of the PB pneumatic quick-connect tee 14 closest to the T-shaped tee 10 is quickly connected to the inlet end of the next ultrasonic nozzle 12 via an air supply pipe 13.

[0028] The air inlet end of the ultrasonic nozzle 12 furthest from the T-shaped tee 10 is connected to the PL pneumatic quick-connect elbow 15 by a threaded connection.

[0029] A check valve A71 is installed on the stainless steel pipe C23 to prevent backflow.

[0030] The air outlet ends of the Y-type tee A81 are connected to the air inlet ends of high-pressure hose A91 and high-pressure hose B92 respectively using quick-connect methods. The air outlet of the high-pressure hose A91 is connected to the air inlet of the first-stage ultrasonic spray bar using a quick-connect method. One end of the T-shaped tee 10 is connected to the air inlet of the high-pressure hose E95 using a quick-connect method; the air outlet of the high-pressure hose E95 is connected to the end of the air inlet main rod 11 using a quick-connect method, so that air can enter from both ends of the air inlet main rod 11 at the same time.

[0031] like Figure 1 As shown, the second branch includes an inlet steel pipe, a water filter 6, and a secondary ultrasonic spray bar. The inlet steel pipe is divided into three sections: stainless steel pipe D24, stainless steel pipe E25, and stainless steel pipe F26. A shut-off valve B102 is installed at the front end of stainless steel pipe D24. A pressure regulating valve B32 is installed between stainless steel pipe D24 and stainless steel pipe E25. The water filter 6 is installed between stainless steel pipe E25 and stainless steel pipe F26. A Y-type tee B82 is connected to the end of stainless steel pipe F26. The other two outlets of the Y-type tee B82 are connected to the inlet ends of high-pressure hose C93 and high-pressure hose D94, respectively. The outlet end of high-pressure hose C93 is connected to the ultrasonic nozzle 12. The outlet end of high-pressure hose D94 is connected to the secondary cloud spray bar. At the same time, the outlet end of high-pressure hose B92 is connected to the secondary cloud spray bar.

[0032] The secondary cloud mist spray bar includes multiple cloud mist nozzles 16, each cloud mist nozzle 16 having an air inlet end and a water inlet end. The air inlet end is connected to a PB pneumatic quick-connect tee 14, which is connected to the cloud mist air inlet main rod body 17 as an air inlet branch. The water inlet end is connected to multiple PB pneumatic quick-connect tee 14, which are connected to the cloud mist water inlet main rod body 18 in a quick-connect manner as a water inlet branch.

[0033] The air outlet of the cloud and fog air intake main rod 17 is connected to the shut-off valve C103 via a quick-connect method; the water outlet of the cloud and fog water intake main rod 18 is connected to the shut-off valve D104 via a quick-connect method.

[0034] like Figure 1 As shown, the leftmost air intake end of the cloud and mist air intake main rod 17 is the air intake end of the secondary cloud and mist spray rod, and the leftmost water intake end of the cloud and mist water intake main rod 18 is the water intake end of the secondary cloud and mist spray rod.

[0035] A check valve B72 is installed on the stainless steel pipe F26 to prevent water backflow.

[0036] The outlet end of the high-pressure hose B92 is connected to the inlet end of the cloud and fog air intake main rod 17.

[0037] The two outlet ends of the Y-type tee B82 are connected to the inlet ends of the high-pressure hose C93 and the high-pressure hose D94 respectively using a quick-connect method.

[0038] The high-pressure hose C93 water outlet is connected to the first-stage ultrasonic spray bar water inlet using a quick-connect method, and the high-pressure hose D94 water outlet is connected to the second-stage cloud spray bar water inlet using a quick-connect method.

[0039] like Figure 1 As shown, the pressure regulating valve A31, pressure regulating valve B32, stainless steel pipe B22, stainless steel pipe E25, air quality filter 5, and water quality filter 6 are all contained within the air and water filter housing 4. Figure 2 As shown, inlet and outlet holes can be set on the feng shui filter box 4 according to the location of the pipeline.

[0040] The inlet end of the stainless steel pipe A21, the outlet end of the stainless steel pipe C23, the inlet end of the stainless steel pipe D24, and the outlet end of the stainless steel pipe F26 are exposed outside the air and water filter box 4.

[0041] Furthermore, the water filter 6 includes, but is not limited to, a backwash filter or a mechanical filtration device.

[0042] Furthermore, the air quality filter 5 includes, but is not limited to, an oil-water separator or a device capable of filtering gaseous fluids.

[0043] Furthermore, the interface specifications of the shut-off valve can be adjusted according to different pipe diameters.

[0044] Furthermore, the stainless steel pipe should be connected to the shut-off valve, pressure regulating valve, air quality filter 5, water quality filter 6, check valve, and Y-type tee interface.

[0045] Furthermore, the check valve includes, but is not limited to, lift check valves, swing check valves, and butterfly check valves, and has the function of preventing fluid backflow.

[0046] Furthermore, the tee includes, but is not limited to, T-type tees, Y-type tees, reducing tees, etc., and should have three passages and be compatible with connectors.

[0047] Furthermore, the high-pressure hose includes, but is not limited to, a two-layer steel wire high-pressure hose, a four-layer steel wire high-pressure hose, or a flexible pipe that can communicate with the interfaces of each connection part.

[0048] Furthermore, the main body 11 of the first-stage ultrasonic spray bar includes, but is not limited to, rigid or flexible pipes such as seamless steel pipes and seamless iron pipes, and can be fixed to the air inlet end of the ultrasonic nozzle 12 by welding, threaded connection or other means.

[0049] Furthermore, the main body of the secondary cloud mist spray bar includes, but is not limited to, rigid or flexible pipes such as seamless steel pipes and seamless iron pipes, and can be fixed to the air inlet and water inlet of the cloud mist nozzle by welding, threading, or conversion.

[0050] Furthermore, the PB pneumatic quick-connect tee 14 is not limited to materials such as plastic and stainless steel, and can be fixed to the water inlet of the ultrasonic nozzle 12 by means of threads.

[0051] Furthermore, the PL pneumatic quick-connect elbow 15 may include, but is not limited to, materials such as plastic and stainless steel, and can be fixed to the water inlet end of the ultrasonic nozzle 12 by threaded connection.

[0052] Furthermore, the ultrasonic nozzle 12 specifications include, but are not limited to, SK508, SV882, and SV980.

[0053] Furthermore, the specifications of the cloud nozzle 16 include, but are not limited to, SUC, SUK, and SUJ.

[0054] Furthermore, the outer shell material of the feng shui filter box 4 includes, but is not limited to, carbon steel, various types of stainless steel, and other metal materials.

[0055] Furthermore, the number of ultrasonic nozzles 12 and cloud nozzles 16 may be increased or decreased depending on the operating conditions.

[0056] Furthermore, the pressure regulating valve includes, but is not limited to, self-operated pressure regulating valves, pneumatic pressure regulating valves, hydraulic pressure regulating valves, etc.

[0057] The spray dust removal method based on the above-mentioned device specifically includes the following processes: The dust-proof air is filtered through the air quality filter 5 and then enters the first air intake branch. The dust-proof water is filtered through water filter 6 and then enters the first water inlet branch. The first air intake branch sends the filtered gas through the main air intake rod 11 and into multiple ultrasonic nozzles 12 on the air supply pipeline 13. At the same time, the first water intake branch sends the filtered water into multiple ultrasonic nozzles 12 on the air supply pipeline 13. The ultrasonic atomized droplets cross the entire tunnel, forming a full-section fine mist droplet coverage area. Thus, the first-stage spray dust removal is completed. The second air intake branch and the second water intake branch are activated. The second air intake branch sends the filtered gas into the cloud and mist air intake main body 17 and then into the cloud and mist nozzle 16. At the same time, the second water intake branch sends the filtered water into the cloud and mist water intake main body 18 and then into the cloud and mist nozzle 16. The cloud and mist nozzle 16 atomizes the air, and the droplet size after atomization reaches the micron level, which captures and settles the respirable dust that cannot be captured by the first-stage spray, thus completing the second-stage spray dust removal.

[0058] Other components and operations of a coal mine underground filter-type two-stage spray dust removal device according to an embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0059] In the description of this specification, references to terms such as "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A two-stage spray dust removal device for underground coal mines, characterized in that, Including the first branch road and the second branch road; The first branch includes an air intake steel pipe, an air quality filter (5), and a first-stage ultrasonic spray bar; The air quality filter (5) is installed on the air inlet steel pipe. The end of the air inlet steel pipe is connected to the first air inlet branch and the second air inlet branch. The end of the first air inlet branch is connected to the first-stage ultrasonic spray bar. The first-level ultrasonic spray bar includes an air inlet main rod (11), an air supply pipeline (13), and multiple ultrasonic nozzles (12). Multiple pneumatic quick connectors are installed on the air supply pipeline (13). The air inlet of each pneumatic quick connector is connected to the air inlet main rod (11), and the air outlet is connected to an ultrasonic nozzle (12). The second branch includes an inlet steel pipe, a water filter (6) and a secondary cloud spray bar. The water filter (6) is installed on the inlet steel pipe. The end of the inlet steel pipe is connected to the first inlet branch and the second inlet branch. The end of the first inlet branch is connected to the gas pipeline (13). The second air intake branch and the second water intake branch are connected to the secondary cloud spray bar; The secondary cloud and mist spray bar includes a cloud and mist air intake main bar (17), a cloud and mist water intake main bar (18), and multiple cloud and mist nozzles (16). Multiple PB pneumatic quick-connect tees (14) are installed on the cloud and fog air intake main rod (17) and the cloud and fog water intake main rod (18), respectively, and each PB pneumatic quick-connect tee (14) is connected to a cloud and fog nozzle (16).

2. The coal mine underground filter-type two-stage spray dust removal device according to claim 1, characterized in that, The air inlet steel pipe is divided into three sections: stainless steel pipe A (21), stainless steel pipe B (22), and stainless steel pipe C (23). A shut-off valve A (101) is installed at the front end of stainless steel pipe A (21). A pressure regulating valve A (31) is installed between stainless steel pipe A (21) and stainless steel pipe B (22). An air quality filter (5) is installed between stainless steel pipe B (22) and stainless steel pipe C (23).

3. The coal mine underground filter-type two-stage spray dust removal device according to claim 2, characterized in that, The end of the stainless steel pipe C (23) is connected to a Y-type tee A (81). The other two outlets of the Y-type tee A (81) are respectively connected to the inlet of the high-pressure hose A (91) which serves as the first air intake branch and the high-pressure hose B (92) which serves as the second air intake branch. The outlet of the high-pressure hose A (91) is connected to a T-type tee (10). One outlet of the T-type tee (10) is connected to the first-stage ultrasonic spray bar.

4. A two-stage spray dust removal device for underground coal mine filtration as described in claim 3, characterized in that, The other outlet of the T-shaped tee (10) is connected to the high-pressure hose E (95), and the other end of the high-pressure hose E (95) is connected to the end of the air intake main rod (11) to form air intake paths on both sides.

5. A two-stage spray dust removal device for underground coal mines according to claim 1, characterized in that, The inlet steel pipe is divided into three sections: stainless steel pipe D (24), stainless steel pipe E (25), and stainless steel pipe F (26). A shut-off valve B (102) is installed at the front end of stainless steel pipe D (24). A pressure regulating valve B (32) is installed between stainless steel pipe D (24) and stainless steel pipe E (25). A water filter (6) is installed between stainless steel pipe E (25) and stainless steel pipe F (26).

6. A two-stage spray dust removal device for underground coal mine filtration as described in claim 5, characterized in that, The end of the stainless steel pipe F (26) is connected to a Y-type tee B (82), and the other two outlets of the Y-type tee B (82) are respectively connected to the inlet end of the high-pressure hose C (93) which serves as the first water inlet branch and the high-pressure hose D (94) which serves as the second water inlet branch. The outlet end of the high-pressure hose C (93) is connected to the gas supply line (13) to supply water to the ultrasonic nozzle (12); the outlet end of the high-pressure hose D (94) is connected to the secondary cloud spray bar, and the outlet end of the high-pressure hose B (92) is connected to the secondary cloud spray bar.

7. A two-stage spray dust removal device for underground coal mines according to claim 1, characterized in that, Both the cloud and fog air intake main rod (17) and the cloud and fog water intake main rod (18) are equipped with shut-off valves.

8. A two-stage spray dust removal device for underground coal mines according to claim 1, characterized in that, The air quality filter (5) and the water quality filter (6) are installed inside the air and water filter box (4).

9. A two-stage spray dust removal device for underground coal mines according to claim 8, characterized in that, The inlet and outlet holes are set on the feng shui filter box (4) according to the location of the pipeline.

10. The spray dust removal method of the underground coal mine filter-type two-stage spray dust removal device according to any one of claims 1-9, characterized in that, Includes the following processes: The dust-proof air is filtered through the air quality filter (5) and then enters the first air intake branch; The dust-proof water is filtered through the water quality filter (6) and then enters the first water inlet branch; The first air intake branch sends the filtered gas through the main air intake rod (11) and into multiple ultrasonic nozzles (12) on the gas transmission pipeline (13). At the same time, the first water intake branch sends the filtered water into multiple ultrasonic nozzles (12) on the gas transmission pipeline (13). The ultrasonic atomized droplets cross the entire tunnel, forming a full-section fine mist droplet coverage area. Thus, the first-stage spray dust removal is completed. The second air intake branch and the second water intake branch are started. The second air intake branch sends the filtered gas into the cloud and mist air intake main body (17) and into the cloud and mist nozzle (16). At the same time, the second water intake branch sends the filtered water into the cloud and mist water intake main body (18) and into the cloud and mist nozzle (16). The cloud and mist nozzle (16) performs air atomization. The droplet size after air atomization reaches the micron level, which captures and settles the respirable dust that cannot be captured by the first-stage spray, thus completing the second-stage spray dust removal.

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