A method for treating low oxygen in return air corners of mines

Abstract

The present invention discloses a method for treating low oxygen in return air corners of mines. The method is based on a return air corner low oxygen treatment system; it includes an underground extraction module, a spraying partition module, and a monitoring and warning module; the underground extraction module is used to extract low oxygen gas in the goaf, and the underground extraction module includes a functional fan, an extraction pipeline, and a three-dimensional joint. The low oxygen gas can be eliminated from the source through the underground extraction module; the spraying partition module forms a partition layer by spraying a partition material to prevent low oxygen gas from diffusing and leaking air; the monitoring and warning module is used to monitor gas information in real time and provide feedback, which can determine the effect of low oxygen treatment in the goaf near the upper corner of the working face and realize information interaction and linkage control with other modules. The present invention can isolate the problem of low oxygen in the corner caused by gas overflow from the goaf due to air leakage, and solve the problem of low oxygen gas enrichment in the goaf in the corner, eliminate low oxygen gas from the source, and can monitor and feedback in real time, making the treatment plan safer and more reliable.

Description

Technical Field

[0001] The present invention relates to the field of mine safety technology, and in particular to a method for treating low oxygen levels in a return air corner of a mine. Background Art

[0002] During coal mining, hypoxia in the corners of the working face is a major obstacle to safe production. This hypoxic environment is often caused by the release of nitrogen and carbon dioxide from coal left in the goaf. Furthermore, the excess oxygen absorbed by the coal exceeds the total amount released, leading to oxygen depletion. Furthermore, the use of gob-side entry-retaining mining methods exacerbates air leakage, leading to large amounts of inert gas entering the return air corners and dispersing into the working face and roadways, further exacerbating the hypoxic condition, impacting mine ventilation stability, and hindering safe production.

[0003] Existing invention patent CN118774919A discloses a device and method for treating hypoxia in return air corners. This device primarily improves ventilation conditions through physical means. The device consists of two symmetrically arranged blocking plates, with at least one ventilation duct installed between them. The duct features a V-shaped air duct for circulating and exhausting air. By directly ventilating the return air corners, the device addresses hypoxia caused by stagnant air flow at low pressure, thereby increasing the oxygen content in the return air corners.

[0004] Regarding the above-mentioned prior art, the inventors believe that although the above-mentioned equipment can promote air flow to a certain extent, it does not control the low-oxygen gas at the source. The low-oxygen gas in the goaf continues to escape, and the air leakage along the goaf will make this phenomenon more serious. Secondly, the installation and disassembly of the equipment may be relatively complicated, requiring precise assembly and positioning, and lacks the application of corresponding intelligent monitoring or automation systems. Therefore, the adaptability and flexibility of the above-mentioned methods are relatively low, and it is difficult to adapt to the changing mine environment and operational requirements. Summary of the Invention

[0005] In response to the problems existing in the above-mentioned prior art, the present invention provides a method for treating low oxygen in the return air corners of mines, which can isolate the low oxygen phenomenon in the corners caused by gas overflow in the goaf due to air leakage, solve the problem of low oxygen gas enrichment in the goaf in the corners, eliminate low oxygen gas from the source, and can monitor and feedback the entire process management in real time, making the low oxygen treatment solution safer and more reliable.

[0006] To achieve the above objectives, the present invention provides a method for treating low oxygen levels in return air corners of mines. The method is based on a return air corner low oxygen treatment system. The return air corner low oxygen treatment system includes an underground extraction module, a spraying isolation module, and a monitoring and warning module.

[0007] The downhole extraction module is used to extract low-oxygen gas in the goaf. The downhole extraction module includes a functional fan, an extraction pipeline and a three-dimensional joint. The functional fan is connected to the three-dimensional joint through the extraction pipeline. The three-dimensional joint has a conversion control mechanism with adjustable position to realize the extraction of low-oxygen gas in different time and space. The low-oxygen gas can be eliminated from the source through the downhole extraction module; the spraying partition module forms an isolation layer by spraying isolation material to prevent the diffusion and air leakage of low-oxygen gas; the monitoring and warning module is used to monitor gas information in real time and feedback. It includes a multi-parameter sensor and an intelligent management and control platform, which can judge the low-oxygen control effect in the goaf near the upper corner of the working face and realize information interaction and linkage control with other modules.

[0008] Furthermore, the functional fan includes a first pneumatic motor, a primary filter device, a secondary filter device, a flow guide pipe, and an intelligent air pressure controller; the first pneumatic motor is powered by a ground air compressor, which provides an air source for the first pneumatic motor; the primary filter device uniformly mixes the polluted air with the water mist, removes impurities in the polluted air, and discharges the mixed air into a waste liquid pool; the outlet of the primary filter device is connected to the secondary filter device, which is used to further absorb impurities in the polluted air to improve the purity of the gas;

[0009] The guide pipe is connected to the outlet end of the secondary filtration device. A CO scavenger and a heating network are sequentially arranged inside the guide pipe in the direction close to the secondary filtration device. The guide pipe adopts a streamlined design. The intelligent air pressure controller can automatically adjust the extraction pressure according to the gas concentration and pressure changes in the goaf to achieve efficient extraction and reduce energy consumption.

[0010] Furthermore, the three-dimensional joint is arranged in the protective sleeve, and the three-dimensional joint includes a detachable straight joint, an arc joint and a semi-completed U-shaped joint. The three-dimensional joint is connected to the end of the extraction pipeline away from the functional fan through a tee; the conversion control mechanism is arranged in the arc joint and the semi-completed U-shaped joint, and the spatial position of the three-dimensional joint is adjusted by the conversion control mechanism to realize the extraction of low-oxygen gas at different spatial positions.

[0011] Furthermore, the conversion control mechanism includes an electric push rod, a rotary joint and an angle sensor. The electric push rod receives instructions from the control system to push the arc joint or semi-finished U-shaped joint to perform linear displacement; the arc joint or semi-finished U-shaped joint can rotate within a certain angle range through the rotary joint. The angle sensor is used to monitor the joint angle changes in real time and feed back to the intelligent management and control platform. The intelligent management and control platform intelligently plans the position and angle of the three-dimensional joint according to the gas parameters to realize low-oxygen gas extraction in different time and space.

[0012] Furthermore, the surface of the three-dimensional joint is coated with a wear-resistant coating, and the wear-resistant coating is coated with two layers of titanium nitride and chromium nitride coating alternately; a dust filter is provided at the end of each joint of the three-dimensional joint; and a flow valve is provided on each joint of the three-dimensional joint to independently control the pumping and discharging flow of each joint of the three-dimensional joint.

[0013] Furthermore, a symmetrical respiratory isolation door is provided on each joint of the three-dimensional joint, the two hinged door bodies of the symmetrical respiratory isolation door are connected to the fixed anchor end through a spring, a blocking strip is provided on the inner side of the symmetrical respiratory isolation door, and a center seam sealing strip is provided in the middle of the two hinged door bodies of the symmetrical respiratory isolation door.

[0014] Furthermore, the spray partition module includes an inorganic sprayer A, an inorganic sprayer B, a mortar sprayer, an air cloth and a steel frame; the material A sprayed by the inorganic sprayer A and the material B sprayed by the inorganic sprayer B collide with each other, mix and quickly solidify to form a flexible film; the mortar sprayer is used to spray the bottom ash inorganic mortar.

[0015] Furthermore, the material A is nano-aerogel-based liquid rubber, and the material B is an 8%-12% aqueous solution of anhydrous calcium chloride or an 8%-12% aqueous solution of zinc sulfate monohydrate.

[0016] Furthermore, the mortar spraying machine includes a second pneumatic motor, a speed reducer, a hopper, an air-compressed thrust-type high-blade spiral graded conveyor, and a spray head;

[0017] The pneumatic thrust type high-leaf spiral grading conveyor comprises a first-stage high-leaf spiral blade, a second-stage peristaltic spiral sleeve, and a third-stage variable pressure deflector arranged in sequence along the discharge direction; the first-stage high-leaf spiral blade performs shearing for the initial conveying, the second-stage peristaltic spiral sleeve performs extrusion for the secondary conveying, and the third-stage variable pressure deflector realizes boosted conveying;

[0018] The rotating shaft of the air-compressed thrust high-blade spiral grading conveyor is a hollow air guide rod. The inside of the hollow air guide rod is high-pressure gas, and the outlet passes through a three-stage variable pressure deflector to achieve gas-phase assisted solid-liquid phase particle acceleration.

[0019] Furthermore, the partition layer formed by the spray partition module is a three-layer sealing structure composed of a steel frame, an air cloth, a bottom ash inorganic mortar and a flexible membrane; the steel frame is a mesh structure formed by horizontal and vertical steel wires perpendicularly crossing each other; the air cloth covers one side of the steel frame and is fixed by iron wires; the bottom ash inorganic mortar is hung on the wall and piled on the other side of the steel frame to form a flat wall; the flexible membrane is hung on the wall and adhered to the side wall of the bottom ash inorganic mortar away from the steel frame.

[0020] Beneficial effects of the present invention:

[0021] 1. The downhole extraction module of the present invention has the ability to eliminate hypoxic gas from the source. Through the intelligent control system of the functional fan and the uniquely designed three-dimensional joint, it can accurately locate and efficiently extract hypoxic gas at different positions and concentrations in the goaf. This source control method avoids the continuous influx of hypoxic gas into the return air corner, which is the key to solving the hypoxia problem and has significant advantages over the existing technology.

[0022] 2. The isolation layer formed by the sprayed isolation module plays an important role in preventing the diffusion of low-oxygen gas. It can not only effectively block the low-oxygen gas flow field from diffusing to the working face, but also isolate the air leakage along the empty lanes and eliminate the inert gas being pressed toward the corners. This isolation measure further improves the low-oxygen condition in the return air corners and reduces the adverse effects of low-oxygen gas on the working face and lanes.

[0023] 3. The functional fan in the underground extraction module is equipped with an intelligent control system, which can automatically adjust the extraction pressure according to the changes in gas concentration and pressure in the goaf, thereby improving the extraction efficiency and reducing energy consumption. The double filter device and guide pipe structure installed inside the fan can effectively remove dust and impurity particles in the extracted gas, making the exhaust gas purer, and the streamlined design of the guide pipe reduces the exhaust back pressure.

[0024] 4. The multi-parameter sensor in the monitoring and warning module adopts high-precision and high-sensitivity detection elements, which can accurately detect multiple gas parameters and has automatic calibration and fault diagnosis functions to ensure the accuracy and reliability of the detection data; the intelligent management and control platform has powerful data processing and analysis capabilities, which can not only perform real-time analysis and early warning of monitoring data, but also can be linked with other mine safety systems to achieve comprehensive mine safety management.

[0025] 5. The flexible film formed by the rapid solidification of material A and material B in the spray partition module after particle collision has good thermal stability, high temperature resistance, ductility and toughness. The film is dense and uniform and has Si-O-Si hydrophobicity. When used, the temperature rise in the plugging area is less than 1°C; the bottom ash inorganic mortar is composed of a variety of materials, has anti-static and fire-proof properties, and the compressive strength can reach 40-45Mpa; the application of the above-mentioned new materials significantly improves the partition effect and structural stability.

[0026] 6. The three-dimensional joints of the underground pumping and drainage modules are made of high-strength, corrosion-resistant materials, with a special wear-resistant coating added to the surface. A dust-proof filter is installed at the end, and a labyrinth seal or magnetic seal is used at the tee of the joint to prevent gas leakage; the conversion control mechanism can adjust the spatial position, which can adapt well to the complex working environment under the mine and realize the extraction of low-oxygen gases in different time and space; the isolation layer of the spray partition module adopts a three-layer sealing structure composed of steel frame, waste wind cloth, bottom ash inorganic mortar and flexible membrane. The isolation layer or windbreak layer is constructed near the corner, behind the 2-3 hydraulic supports in the return air lane, and along the outer wall of the empty lane to adapt to the complex environment and ensure the sealing effect.

[0027] 7. The monitoring and warning module can provide real-time feedback on gas information between three-dimensional joint ports, corners, and hydraulic supports, covering multiple parameters such as oxygen concentration, carbon dioxide concentration, nitrogen concentration, gas concentration, temperature, humidity, and pressure, thereby providing strong support for timely grasp of the gas conditions in the mine and providing accurate data basis for hypoxia control.

[0028] 8. The monitoring and warning module can not only transmit gas information to the intelligent management and control platform, but also transmit the information to the functional fan, realizing feedback adjustment of wind pressure and airflow to the functional fan; the functional fan adjusts the exhaust pressure according to the feedback information, further improving the effect of hypoxia treatment; at the same time, the intelligent management and control platform conducts real-time analysis and early warning based on the monitoring data to ensure safe production in the mine. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a flow chart of a method for treating low oxygen in return air corners of a mine.

[0030] Figure 2 It is a schematic diagram of the method for exhausting low oxygen in the return air corner of a mine according to the present invention.

[0031] Figure 3 It is a structural schematic diagram of the symmetrical respiratory isolation door in the present invention.

[0032] Figure 4 It is a schematic diagram of the method for blocking and controlling low oxygen in return air corners of a mine according to the present invention.

[0033] Figure 5 It is a structural schematic diagram of the partition layer in the present invention.

[0034] Figure 6 is a scanning electron microscope image of the flexible film of the present invention.

[0035] In the figure: 1. First pneumatic motor; 2. Primary filter device; 3. Secondary filter device; 4. Flow guide tube; 41. Absorbent; 42. Heating net; 5. Protective sleeve; 6. Straight joint; 7. Curved joint; 8. Semi-finished U-shaped joint; 9. Conversion control mechanism; 10. Flow valve; 11. Symmetrical respiratory isolation door; 111. Spring; 112. Blocking strip; 113. Middle seam sealing strip; 12. Second pneumatic motor 13. Reducer; 14. Hopper; 15. First-stage high-blade spiral blade; 16. Second-stage peristaltic spiral sleeve; 17. Third-stage voltage-transformer deflector; 18. Hollow air guide rod; 19. Inorganic sprayer A; 20. Inorganic sprayer B; 21. Multi-parameter sensor; 22. Partition layer; 221. Steel frame; 222. Air cloth; 223. Bottom ash inorganic mortar; 224. Flexible membrane; 23. Windbreak layer; 24. Hydraulic support. DETAILED DESCRIPTION

[0036] The present invention will now be described in further detail with reference to the accompanying drawings.

[0037] The invention discloses a method for treating low oxygen in return air corners of a mine.

[0038] Reference Figure 1 A method for treating low oxygen levels in return air corners in a mine is described. The mine void volume involved in this example is approximately 12,000 cubic meters, and the average low oxygen concentration in the return air corners was 18.2% before measures were taken. This method is based on a return air corner low oxygen treatment system. The system includes an underground extraction and drainage module, a spray isolation module, and a monitoring and warning module. These three modules combine extraction, blocking, and warning functions to achieve a comprehensive low oxygen treatment technology.

[0039] Reference Figure 1 The underground pumping module is used to pump out low-oxygen gas in the goaf; the spraying isolation module is used to prevent low-oxygen gas in the goaf from overflowing to the corners or between the hydraulic supports 24 near the corners, and at the same time reduce the diffusion of inert gas inside the goaf toward the corners due to air leakage along the goaf; the monitoring and warning module is used to provide multi-parameter warning information for the underground pumping module, the spraying isolation module and personnel decision-making.

[0040] Reference Figure 2 The downhole drainage module includes a functional fan, a drainage pipeline and a three-dimensional joint; the air inlet of the functional fan is connected to the clamp at one end of the drainage pipeline; the three-dimensional joint is arranged in the protective casing 5, and the three-dimensional joint includes a detachable straight joint 6, an arc joint 7 and a semi-finished U-shaped joint 8, each of which is fixedly connected to the other end of the drainage pipeline through a tee. The arc joint 7 and the semi-finished U-shaped joint 8 are provided with a conversion control mechanism 9 for spatial position adjustment to realize the extraction of low-oxygen gas at different spatial positions. The downhole drainage module can effectively extract the low-oxygen gas in the goaf and eliminate the low-oxygen gas at the source.

[0041] Reference Figure 2 The functional blower includes a first pneumatic motor 1, a primary filter 2, a secondary filter 3, a flow guide 4, and an intelligent air pressure controller. The first pneumatic motor 1 is powered by a surface air compressor, which provides a 0.3-0.7 MPa air source underground via a 16-25 pipe and a 16-25KJ quick-connect connector. The primary filter 2 evenly mixes the polluted air with the water mist, effectively removing impurities such as dust and discharging them into a wastewater tank. The outlet of the primary filter 2 is connected to the secondary filter 3, which further absorbs impurities in the polluted air to improve gas purity.

[0042] Reference Figure 2 The flow guide 4 is connected to the outlet of the secondary filter 3. A CO scavenger 41 and a heating network 42 are sequentially arranged inside the flow guide 4 in the direction close to the secondary filter 3. The CO scavenger 41 is mainly composed of Co3O4 nanorods, which can absorb CO at temperatures above 40°C, preventing the exhaust gas from exceeding the CO limit in the roadway. The heating network 42 is made of highly thermally conductive graphene or nickel-chromium alloy materials, which can quickly provide a stable heat source for the CO scavenger 41, heating the gas and improving the activity and purification effect of the scavenger 41. In addition, the overall streamlined design of the flow guide 4 makes the internal airflow distribution more uniform and significantly reduces the exhaust back pressure. The intelligent air pressure controller can automatically adjust the extraction pressure according to the changes in gas concentration and pressure in the goaf to achieve efficient extraction and reduce energy consumption.

[0043] Reference Figure 2 and Figure 3 The center distance between the straight joint 6, the arc joint 7 and the semi-finished U-shaped joint 8 is 5m, and they are all made of titanium and titanium alloy with extremely high strength and weight ratio. At the same time, the surface of the joint is coated with a wear-resistant coating. The wear-resistant coating adopts two layers of titanium nitride and chromium nitride coating alternately to adapt to the harsh working environment under the mine; and each joint is provided with a dust filter at the end to filter dust. The connection between each joint of the three-dimensional joint and the tee adopts a labyrinth seal or magnetic seal to effectively prevent gas leakage; each joint is provided with a flow valve 10 1m away from the tee, and the flow rate of the three joints can be independently controlled by the flow valve 10; when the flow valve 10 is adjusted, the wind pressure information is quickly fed back to the intelligent air pressure controller to autonomously adjust the motor speed, control the negative pressure of the pumping, and ensure the safety and reliability of the pipeline. Each joint of the three-dimensional joint is provided with a symmetrical breathing isolation door 11 4m away from the tee. In this embodiment, two symmetrical breathing isolation doors 11 are provided in each joint, which are divided into the first breathing isolation door and the second breathing isolation door. They use wind pressure and airflow to achieve automatic control and realize double isolation to avoid the breathing effect between the goaf gas and the working face gas under non-working conditions.

[0044] Reference Figure 3 The two hinged door bodies of the symmetrical respiratory isolation door 11 are connected to the fixed anchor end through a spring 111. A blocking strip 112 is also provided inside the symmetrical respiratory isolation door 11. The blocking strip 112 is located on the upper and lower sides of the joint, with a height of 0.02m. A sealing gasket is fixed to the side wall of the blocking strip 112, and a center seam sealing strip 113 is provided in the middle of the two hinged door bodies of the symmetrical respiratory isolation door 11; when the two door bodies of the symmetrical respiratory isolation door 11 are closed, the center seam sealing strip 113 will be squeezed to improve the sealing performance, which can effectively prevent the spread of airflow.

[0045] The conversion control mechanism 9 includes an electric push rod, a rotary joint and an angle sensor. The electric push rod receives instructions from the control system to push the joint for linear displacement. The rotary joint allows the joint to rotate within a certain angle range. The angle sensor is used to monitor the joint angle changes in real time and feed back to the intelligent management and control platform. The intelligent management and control platform intelligently plans the position and angle of each joint according to gas parameters, etc., to realize low-oxygen gas extraction in different time and space.

[0046] Reference Figure 4 The spray partition module includes an inorganic sprayer A19, an inorganic sprayer B20, a mortar sprayer, a wind cloth 222, and a steel frame 221. The inorganic sprayer A19 is used to spray material A, which consists of nano-aerogel-based liquid rubber, which is composed of antistatic agents, antioxidants, rubber asphalt, silica aerogel particles, magnesium hydroxide, aluminum hydroxide, melamine, and other materials. Material B is an 8%-12% aqueous solution of anhydrous calcium chloride or an aqueous solution of zinc sulfate monohydrate, with the purity of the anhydrous calcium chloride and zinc sulfate monohydrate being 95%. When material B is an 8%-12% aqueous solution of anhydrous calcium chloride, the spray flow ratio of material A to material B is 10:1; when material B is an 8%-12% aqueous solution of zinc sulfate monohydrate, the spray flow ratio of material A to material B is 7:1.

[0047] Reference Figure 6 After the particles of material A and material B collide at the outlet of the spray gun, they quickly solidify to form a flexible membrane 224. The flexible membrane 224 has certain thermal stability, high temperature resistance, ductility and toughness. It is dense and uniform and has the hydrophobicity of Si-O-Si. When used, it releases a large amount of water, achieving a temperature rise of less than 1°C in the plugging area.

[0048] The mortar sprayer is used to spray bottom ash inorganic mortar 223. Bottom ash inorganic mortar 223 is composed of garbage bottom ash, slag ash, fly ash, sodium hydroxide, water glass, antistatic agent, flame retardant, guar gum, sodium hydroxymethyl cellulose and water. It has certain anti-static and fire-proof characteristics, and its compressive strength can reach 40-45Mpa.

[0049] Reference Figure 4The mortar spraying machine includes a second pneumatic motor 12, a reducer 13, a hopper 14, a pneumatic thrust-type high-blade spiral grading conveyor, and a nozzle. The pneumatic thrust-type high-blade spiral grading conveyor includes a first-stage high-blade spiral blade 15, a second-stage peristaltic spiral sleeve 16, and a third-stage variable-pressure deflector 17, which are arranged in sequence along the discharge direction. The first-stage high-blade spiral blade 15 performs shearing for initial conveying, the second-stage peristaltic spiral sleeve 16 performs extrusion for secondary conveying, and the third-stage variable-pressure deflector 17 provides boosted conveying. The rotating shaft of the pneumatic thrust-type high-blade spiral grading conveyor is a hollow gas guide rod 18, which contains 0.3-0.7MPa high-pressure gas. The outlet passes through the third-stage variable-pressure deflector 17, achieving gas-phase boosting and solid-liquid phase particle acceleration. The nozzle is connected to the outlet of the third-stage variable-pressure deflector 17, and the nozzle outlet pressure is ≥8MPa. The hopper 14 is equipped with a material level pressure sensor, which can monitor the remaining material in the hopper 14 in real time, facilitating timely material replenishment.

[0050] After the spraying partition module is implemented after the hydraulic support 24 near the corner, it can form an effective isolation layer 22 and a windbreak layer 23. The isolation layer 22 and the windbreak layer 23 can prevent the diffusion of the low-oxygen gas flow field working surface. At the same time, directly spraying the flexible membrane 224 can block air leakage along the empty lane and weaken the diffusion of inert gas to the corner.

[0051] Reference Figure 5 The partition layer 22 is a three-layer sealing structure composed of a steel frame 221, an air cloth 222, a bottom ash inorganic mortar 223 and a flexible membrane 224. The steel frame 221 is a mesh structure formed by the perpendicular intersection of horizontal and vertical steel wires. The diameter of the steel wire is 6-10mm, and the grid is 6cm square; the air cloth 222 covers one side of the steel frame 221 and is fixed by iron wires with a fixed spacing of 0.2m, while the other side of the steel frame 221 is piled up by the bottom ash inorganic mortar 223 hanging on the wall to form a flat wall. On the side wall of the bottom ash inorganic mortar 223 away from the steel frame 221, a flexible membrane 224 is hung on the wall and adhered. The flexible membrane 224 has good toughness and prevents the bottom ash inorganic mortar 223 wall from cracking and air leakage when under pressure. Such a design not only enables rapid construction, but also has a stable structure and can effectively play a sealing role.

[0052] Since there may be air leakage behind the 2nd-3rd hydraulic supports 24 in the return air channel, a windbreak layer 23 can be set behind the hydraulic supports 24 at this time. The windbreak layer 23 is constructed by a steel frame 221 formed by 5mm diameter steel wire, an air cloth 222 and a flexible membrane 224; the 5mm steel wire is easy to bend, ensuring adaptability and feasibility in complex behind-the-frame environments.

[0053] Reference Figure 2The monitoring and warning module includes a multi-parameter sensor 21, which can provide real-time feedback on the gas information between the three-dimensional joint port, corner, and hydraulic support 24, and transmit it to the intelligent management and control platform through the meash network to judge the effect of low oxygen control in the goaf near the corner of the working face. At the same time, the gas information can be transmitted to the functional fan to realize feedback adjustment of the wind pressure and airflow to the functional fan.

[0054] Multi-parameter sensors 21 are located within the three-dimensional joint ports, near corners, and behind the second or third hydraulic supports 24 within the return airway. These sensors utilize high-precision, high-sensitivity detection elements with an operating voltage of DC9-24V and an operating current of ≤350mA. They are 200mm long and 60mm in diameter. They can accurately measure multiple parameters, including oxygen concentration, carbon dioxide concentration, nitrogen concentration, gas concentration, temperature, humidity, differential pressure, and absolute pressure. This information can be transmitted in real time to a workstation or the intelligent air pressure controller. The sensors feature automatic calibration and fault diagnosis capabilities, ensuring the accuracy and reliability of the test data.

[0055] The intelligent management and control platform boasts powerful data processing and analysis capabilities, enabling real-time analysis and early warning of monitoring data. The platform's visual interface allows operators to intuitively understand gas conditions within the mine and the effectiveness of hypoxia control. Furthermore, the platform can be integrated with other mine safety systems to achieve comprehensive mine safety management.

[0056] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A method for treating low oxygen levels in return air corners of a mine, characterized by: The treatment method is based on a return air corner hypoxia treatment system; the return air corner hypoxia treatment system includes an underground extraction module, a spray isolation module, and a monitoring and warning module; The downhole extraction module is used to extract hypoxic gas in the goaf. The downhole extraction module includes a functional blower, an extraction pipeline and a three-dimensional joint. The functional blower is connected to the three-dimensional joint through the extraction pipeline. The three-dimensional joint has a conversion control mechanism (9) with adjustable position to realize the extraction of hypoxic gas at different times and spaces. The hypoxic gas can be eliminated from the source through the downhole extraction module. The spraying isolation module forms an isolation layer (22) by spraying isolation material to prevent the diffusion and air leakage of hypoxic gas. The monitoring and warning module is used to monitor gas information in real time and provide feedback. It includes a multi-parameter sensor (21) and an intelligent management and control platform, which can judge the hypoxic treatment effect in the goaf near the upper corner of the working face and realize information interaction and linkage control with other modules. The three-dimensional joint is arranged in the protective sleeve (5), and the three-dimensional joint includes a detachable straight joint (6), an arc joint (7) and a semi-finished U-shaped joint (8). The three-dimensional joint is connected to the end of the extraction pipeline away from the functional fan through a tee. The conversion control mechanism (9) is arranged in the arc joint (7) and the semi-finished U-shaped joint (8). The spatial position of the three-dimensional joint is adjusted by the conversion control mechanism (9), so as to realize the extraction of low-oxygen gas at different spatial positions. The conversion control mechanism (9) includes an electric push rod, a rotary joint, and an angle sensor. The electric push rod receives a control system instruction to push the arc joint (7) or the semi-finished U-shaped joint (8) to perform linear displacement. The arc joint (7) or the semi-finished U-shaped joint (8) can rotate within a certain angle range through the rotary joint. The angle sensor is used to monitor the joint angle change in real time and feed it back to the intelligent management and control platform. The intelligent management and control platform intelligently plans the position and angle of the three-dimensional joint according to the gas parameters, thereby realizing the extraction of low-oxygen gas in different time and space. The spraying partition module comprises an inorganic sprayer A (19), an inorganic sprayer B (20), a mortar sprayer, an air cloth (222) and a steel frame (221); the material A sprayed by the inorganic sprayer A (19) and the material B sprayed by the inorganic sprayer B (20) collide with each other, mix and quickly solidify to form a flexible film (224); the mortar sprayer is used to spray the bottom ash inorganic mortar (223); The material A is a nano-aerogel-based liquid rubber, and the material B is an 8%-12% aqueous solution of anhydrous calcium chloride or an 8%-12% aqueous solution of zinc sulfate monohydrate. The partition layer (22) formed by the spray partition module is a three-layer blocking structure composed of a steel frame (221), an air cloth (222), a bottom ash inorganic mortar (223) and a flexible membrane (224); the steel frame (221) is a mesh structure formed by mutually perpendicular intersection of horizontal and vertical steel wires; the air cloth (222) covers one side of the steel frame (221) and is fixed by iron wires; the bottom ash inorganic mortar (223) is hung on the wall and piled on the other side of the steel frame (221) to form a flat wall; the flexible membrane (224) is hung on the wall and adhered to the side wall of the bottom ash inorganic mortar (223) away from the steel frame (221).

2. A method for treating low oxygen levels in return air corners in a mine according to claim 1, characterized in that: The functional fan comprises a first pneumatic motor (1), a primary filter device (2), a secondary filter device (3), a flow guide pipe (4) and an intelligent air pressure controller; the power source of the first pneumatic motor (1) comes from a ground air compressor, and the ground air compressor provides an air source for the first pneumatic motor (1); the primary filter device (2) allows the polluted air to be evenly mixed with the water mist, removes impurities in the polluted air, and discharges the mixed air into a waste liquid pool; the outlet end of the primary filter device (2) is connected to the secondary filter device (3), and the secondary filter device (3) is used to further absorb impurities in the polluted air to improve the purity of the gas; The flow guide pipe (4) is connected to the outlet end of the secondary filtering device (3), and a CO scavenger (41) and a heating network (42) are sequentially arranged inside the flow guide pipe (4) in a direction close to the secondary filtering device (3); the flow guide pipe (4) adopts a streamlined design, and the intelligent air pressure controller can automatically adjust the extraction pressure according to the gas concentration and pressure changes in the goaf, so as to achieve efficient extraction and reduce energy consumption.

3. A method for treating low oxygen levels in return air corners of a mine according to any one of claim 2, characterized in that: The surface of the three-dimensional joint is coated with a wear-resistant coating, which is formed by alternating two layers of titanium nitride and chromium nitride coatings; a dust filter is provided at the end of each joint of the three-dimensional joint; and a flow valve (10) is provided on each joint of the three-dimensional joint to independently control the pumping and discharging flow of each joint of the three-dimensional joint.

4. A method for treating low oxygen levels in return air corners of a mine according to claim 3, characterized in that: A symmetrical respiratory isolation door (11) is provided on each joint of the three-dimensional joint, the two hinged door bodies of the symmetrical respiratory isolation door (11) are connected to the fixed anchor end through a spring (111), a blocking strip (112) is provided on the inner side of the symmetrical respiratory isolation door (11), and a center seam sealing strip (113) is provided in the middle of the two hinged door bodies of the symmetrical respiratory isolation door (11).

5. A method for treating low oxygen levels in return air corners of a mine according to claim 4, characterized in that: The mortar spraying machine comprises a second pneumatic motor (12), a speed reducer (13), a hopper (14), an air-compressed thrust type high-leaf spiral grading conveyor and a spray head; The air-pressure thrust type high-leaf spiral grading conveyor comprises a first-stage high-leaf spiral blade (15), a second-stage peristaltic spiral sleeve (16), and a third-stage variable pressure deflector (17) sequentially arranged along the discharge direction; the first-stage high-leaf spiral blade (15) performs shearing for the initial conveying, the second-stage peristaltic spiral sleeve (16) performs extrusion for the second conveying, and the third-stage variable pressure deflector (17) realizes boosted conveying; The rotating shaft of the air-compression thrust type high-leaf spiral grading conveyor is a hollow air guide rod (18), the interior of the hollow air guide rod (18) is high-pressure gas, and the outlet passes through the three-stage variable pressure deflector (17) to achieve gas phase-assisted solid and liquid phase particle acceleration.

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