Low-oxygen treatment method for mine return air corner

Abstract

The invention discloses a low-oxygen treatment method for a mine return air corner. The treatment method is based on a return air corner low-oxygen treatment system. Comprising an underground drainage module, a spraying partition module and a monitoring warning module. The underground drainage module is used for extracting hypoxia gas in a goaf, the underground drainage module comprises a functional fan, a drainage pipeline and a three-dimensional connector, and the hypoxia gas can be eliminated from the source through the underground drainage module; the spraying partition module forms a partition layer by spraying a partition material so as to prevent diffusion and air leakage of the low-oxygen gas; the monitoring and warning module is used for monitoring gas information in real time and feeding back the gas information, and can judge the hypoxia treatment effect in the goaf near the upper corner of the working face and achieve information interaction and linkage control with other modules. The problem of corner hypoxia caused by goaf gas overflow due to air leakage can be solved, the problem of goaf hypoxia gas enrichment in the corner is solved, hypoxia gas is eliminated from the source, real-time monitoring and feedback can be achieved, and the disposal scheme is safer and more reliable.

Description

Technical Field

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

[0002] During coal mining, the problem of low oxygen in the corners of the working face is a difficult problem that restricts safe production. The formation of a low oxygen environment is usually related to the release of nitrogen and carbon dioxide from the coal in the goaf. At the same time, the amount of oxygen adsorbed by the coal exceeds the total amount of gas released, which will also lead to a thin oxygen supply. In addition, the use of the mining method of leaving lanes along the goaf will aggravate the air leakage phenomenon, causing a large amount of inert gas to enter the return air corners and spread to the working face and lanes, further worsening the low oxygen condition, affecting the ventilation stability of the mine, and hindering safe production.

[0003] The existing invention patent with publication number CN118774919A discloses a device and method for treating low oxygen in the return air corner, which mainly improves ventilation conditions through physical equipment. The device is mainly composed of two symmetrically arranged blocking plates, with a ventilation pipe installed between the two blocking plates. At least one ventilation pipe is provided, and a V-shaped air flow channel for circulating and exhausting air is provided. It solves the problem of low oxygen caused by poor air circulation at low pressure by directly ventilating the return air corner, thereby increasing the oxygen content in the return air corner.

[0004] Regarding the above-mentioned prior art, the inventor believes that although the above-mentioned equipment can promote air flow to a certain extent, it does not control the low-oxygen gas from the source. The low-oxygen gas in the goaf still escapes continuously, and the air leakage along the goaf will make this phenomenon more serious. Secondly, the installation and disassembly of the equipment may be more 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 method are relatively low, and it is difficult to adapt to the changing mine environment and operational requirements. Summary of the invention

[0005] In view of 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 from 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, so that the low oxygen treatment plan is safer and more reliable.

[0006] To achieve the above-mentioned purpose, the present invention provides a method for treating low oxygen in return air corners of mines, which is based on a low oxygen treatment system for return air corners; the return air corner low oxygen treatment system includes an underground extraction module, a spraying partition module and a monitoring and warning module;

[0007] The downhole extraction module is used to extract low-oxygen gas in the goaf, and 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, and the three-dimensional joint has an adjustable position conversion control mechanism 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 a partition layer by spraying partition 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, which 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 guide tube and an intelligent air pressure controller; the power source of the first pneumatic motor comes from a ground air compressor, and the ground air compressor provides an air source for the first pneumatic motor; the primary filter device allows the polluted air to be evenly mixed with the water mist, removes impurities in the polluted air, and discharges them into a waste liquid pool; the outlet end of the primary filter device is connected to the secondary filter device, and the secondary filter device 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 filtering device, and a CO absorbing agent and a heating network are sequentially arranged inside the guide pipe in the direction close to the secondary filtering device; the guide pipe adopts a streamlined design, and the intelligent air pressure controller can automatically adjust the exhaust 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 rotating joint and an angle sensor. The electric push rod receives a command from the control system to push the arc joint or the semi-finished U-shaped joint to perform linear displacement; the arc joint or the semi-finished U-shaped joint can rotate within a certain angle range through the rotating joint. The angle sensor is used to monitor the change of the joint angle 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 to realize the extraction of low-oxygen gas 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 extraction and discharge flow of each joint of the three-dimensional joint.

[0013] Furthermore, a symmetrical breathing isolation door is provided on each joint of the three-dimensional joint, the two hinged door bodies of the symmetrical breathing isolation door are connected to the fixed anchor end through a spring, a blocking strip is provided on the inner side of the symmetrical breathing isolation door, and a center seam sealing strip is provided in the middle of the two hinged door bodies of the symmetrical breathing 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 and mix with each other and quickly solidify to form a flexible film; the mortar sprayer is used to spray the base ash inorganic mortar.

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

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

[0017] The air-compressed thrust type high-blade spiral grading conveyor comprises a first-stage high-blade spiral blade, a second-stage peristaltic spiral sleeve rod and a third-stage variable-pressure flow guide arranged in sequence along the discharging direction; the first-stage high-blade spiral blade performs shearing for the first conveying, the second-stage peristaltic spiral sleeve rod performs extrusion for the second conveying, and the third-stage variable-pressure flow guide realizes boosted conveying;

[0018] The rotating shaft of the air-compressed thrust type high-blade spiral grading conveyor is a hollow air guide rod, and the interior of the hollow air guide rod is high-pressure gas. The outlet passes through a three-stage variable pressure guide device 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 blocking 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 the perpendicular intersection of horizontal and vertical steel wires; 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 accumulated on the other side of the steel frame to form a flat wall; the flexible membrane is hung on the wall and adheres 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 underground extraction module of the present invention has the ability to eliminate low-oxygen 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 low-oxygen gas at different positions and concentrations in the goaf. This source control method avoids the continuous influx of low-oxygen gas into the return air corner, which is the key to solving the low-oxygen 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; and the double filtering 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 a variety of 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, and 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 has significantly improved the partition effect and structural stability.

[0026] 6. The three-dimensional joints of the underground extraction and discharge modules are made of high-strength and corrosion-resistant materials, with a special wear-resistant coating added on 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 in the mine and realize the extraction of low-oxygen gases in different time and space; the partition 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 partition layer or wind-proof 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 the gas information between the three-dimensional joint ports, corners, and hydraulic supports, covering multiple parameters such as oxygen concentration, carbon dioxide concentration, nitrogen concentration, gas concentration, temperature, humidity, pressure, etc., 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, so as to realize the 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 the safe production of 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 a return air corner of a mine.

[0030] Figure 2 It is a schematic diagram of the method for exhausting low oxygen from return air corners in 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 low oxygen blocking and isolation treatment method for return air corners in a mine according to the present invention.

[0033] Figure 5 It is a schematic structural 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. digester; 42. heating net; 5. protective sleeve; 6. straight joint; 7. arc 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 1. Reach; 13. Speed ​​reducer; 14. Hopper; 15. First-stage high-blade spiral blade; 16. Second-stage peristaltic spiral sleeve rod; 17. Third-stage 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. Wind 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 a return air corner of a mine.

[0038] Reference Figure 1 A method for treating low oxygen in the return air corner of a mine. The empty area of ​​the mine involved in this embodiment has a volume of about 12,000 cubic meters, and the low oxygen concentration in the return air corner is 18.2% on average before measures are taken. The method for treating low oxygen in the return air corner is based on a low oxygen treatment system for the return air corner. The low oxygen treatment system for the return air corner includes an underground extraction module, a spraying partition module, and a monitoring and warning module. The three modules above realize a low oxygen treatment technology integrating extraction, blocking, and warning.

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

[0040] Reference Figure 2 The underground extraction and drainage module includes a functional fan, an extraction and drainage pipeline and a three-dimensional joint; the air inlet of the functional fan is connected to a clamp at one end of the extraction and drainage pipeline; the three-dimensional joint is arranged in a 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, and each joint is fixedly connected to the other end of the extraction and 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 underground extraction and drainage module can effectively extract the low-oxygen gas in the goaf and eliminate the low-oxygen gas from the source.

[0041] Reference Figure 2 The functional fan includes a first pneumatic motor 1, a first-level filter device 2, a second-level filter device 3, a guide tube 4 and an intelligent air pressure controller; the power source of the first pneumatic motor 1 comes from the ground air compressor, and the underground 16-25 pipeline and 16-25KJ quick plug provide the first pneumatic motor 1 with a 0.3-0.7Mpa air source. The first-level filter device 2 allows the polluted air to be evenly mixed with the water mist, effectively removes impurities such as dust, and discharges them into the waste liquid pool; the outlet end of the first-level filter device 2 is connected to the second-level filter device 3, which is used to further absorb impurities in the polluted air to improve the purity of the gas.

[0042] Reference Figure 2 , the guide pipe 4 is connected to the outlet end of the secondary filter device 3, and the inside of the guide pipe 4 is sequentially provided with a CO absorbent 41 and a heating net 42 in the direction close to the secondary filter device 3; wherein, the CO absorbent 41 is mainly composed of Co3O4 nanorods, which can achieve an absorption effect above 40°C to prevent the exhaust gas from causing the CO in the roadway to exceed the limit. The heating net 42 is made of highly efficient heat-conductive graphene or nickel-chromium alloy material, which can quickly provide a stable heat source for the CO absorbent 41, heat the gas, and improve the activity and purification effect of the absorbent 41. In addition, the guide pipe 4 is streamlined as a whole, so that the internal air flow distribution is more uniform and the exhaust back pressure is significantly reduced. The intelligent air pressure controller can automatically adjust the exhaust pressure according to the gas concentration and pressure changes 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 a magnetic seal to effectively prevent gas leakage; each joint is provided with a flow valve 10 at 1m away from the tee, and the flow valve 10 can independently control the pumping flow of the three joints; when the flow valve 10 is adjusted, the wind pressure information is quickly fed back to the intelligent air pressure controller, so as to autonomously adjust the motor speed, control the pumping negative pressure, 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 at 4m away from the tee. In this embodiment, two symmetrical breathing isolation doors 11 are provided in each joint, which are divided into a first breathing isolation door and a second breathing isolation door. They utilize wind pressure and airflow to achieve automatic control and realize double isolation to avoid the breathing effect between the gas in the goaf and the gas on the working face 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 in 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. 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 change of the joint angle 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 each joint according to gas parameters, etc., to realize the extraction of low-oxygen gas 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. Among them, the inorganic sprayer A19 is used to spray material A, the material A is a nano-aerogel-based liquid rubber, and the nano-aerogel-based liquid rubber is composed of antistatic agent, antioxidant, rubber asphalt, silica aerogel particles, magnesium hydroxide, aluminum hydroxide, melamine and other materials; material B is an aqueous solution of anhydrous calcium chloride or an aqueous solution of zinc sulfate monohydrate with a concentration of 8%-12%, and the purity of anhydrous calcium chloride and zinc sulfate monohydrate is 95%. When material B uses an aqueous solution of anhydrous calcium chloride of 8%-12%, the spray flow ratio of material A to material B is 10:1; when material B uses an aqueous solution of zinc sulfate monohydrate of 8%-12%, 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, a large amount of water is released to achieve 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, an air-compressed thrust type high-leaf spiral grading conveyor and a nozzle; the air-compressed thrust type high-leaf spiral grading conveyor includes a first-level high-leaf spiral blade 15, a second-level peristaltic spiral sleeve rod 16 and a third-level variable-pressure guide 17 arranged in sequence along the discharging direction; the first-level high-leaf spiral blade 15 performs shearing for the first transmission, the second-level peristaltic spiral sleeve rod 16 performs extrusion for the second transmission, and the third-level variable-pressure guide 17 realizes boost transmission. The rotating shaft of the air-compressed thrust type high-leaf spiral grading conveyor is a hollow gas guide rod 18, the interior of which is 0.3-0.7MPa high-pressure gas, and the outlet is acted on by the third-level variable-pressure guide 17 to realize gas-phase boosting solid-liquid phase particle acceleration. The nozzle is connected to the outlet of the third-level variable-pressure guide 17, and the nozzle outlet pressure is ≥8MPa. The hopper 14 is provided with a material level pressure sensor, which can monitor the material surplus in the hopper 14 in real time, so as to facilitate timely replenishment of materials.

[0050] After the spraying partition module is implemented after the hydraulic support 24 near the corner, it can form an effective partition layer 22 and a wind-blocking layer 23. The partition layer 22 and the wind-blocking 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 into the corner.

[0051] Reference Figure 5 The partition layer 22 is a three-layer blocking structure consisting of a steel frame 221, a wind 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 a 6cm square; the wind 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, it is attached by a flexible membrane 224. 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 blocking role.

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

[0053] Reference Figure 2The monitoring and warning module includes a multi-parameter sensor 21, which can provide real-time feedback of 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 upper corner of the working face. At the same time, the gas information can be transmitted to the functional fan to realize feedback adjustment of wind pressure and airflow to the functional fan.

[0054] The multi-parameter sensor 21 is arranged in the three-dimensional joint port, near the corner, and behind the 2nd-3rd hydraulic support 24 in the return air channel. The multi-parameter sensor 21 adopts a high-precision and high-sensitivity detection element, with an operating voltage of DC9-24V, an operating current of ≤350mA, a length of 200mm, and a diameter of 60mm. It can accurately detect multiple parameters such as oxygen concentration, carbon dioxide concentration, nitrogen concentration, gas concentration, temperature, humidity, differential pressure, absolute pressure, etc., and can transmit this information to the workstation or the intelligent air pressure controller in real time. The sensor has automatic calibration and fault diagnosis functions to ensure the accuracy and reliability of the detection data.

[0055] The intelligent management and control platform has powerful data processing and analysis capabilities, and can conduct real-time analysis and early warning of monitoring data. The platform uses a visual interface to facilitate operators to intuitively understand the gas conditions in the mine and the effect of hypoxia control. At the same time, the platform can also be linked with other mine safety systems to achieve comprehensive mine safety management.

[0056] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for treating hypoxia in a return air corner 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 spraying partition module and a monitoring and warning module; The underground extraction module is used to extract hypoxic gas in the goaf. The underground extraction module comprises 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 (9) with adjustable position to realize the extraction of hypoxic gas in different time and space. The hypoxic gas can be eliminated from the source through the underground 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 feedback. It comprises a multi-parameter sensor (21) and an intelligent management and control platform, which can judge the hypoxic control effect in the goaf near the corner of the working face and realize information interaction and linkage control with other modules.

2. A method for treating low oxygen 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 tube (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 them 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 absorbing agent (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 exhaust pressure according to the gas concentration and pressure changes in the goaf, so as to achieve efficient exhaust and reduce energy consumption.

3. A method for treating low oxygen in return air corners in a mine according to claim 2, characterized in that: The three-dimensional joint is arranged in the protective sleeve (5), and comprises a detachable straight joint (6), an arc joint (7) and a semi-completed U-shaped joint (8). The three-dimensional joint is connected to an 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-completed U-shaped joint (8), and 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.

4. A method for treating low oxygen in return air corners in a mine according to any one of claims 1 to 3, characterized in that: The conversion control mechanism (9) comprises 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 change of the joint angle 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, so as to realize the extraction of low-oxygen gas in different time and space.

5. A method for treating hypoxia in a return air corner of a mine according to any one of claims 1 to 3, characterized in that: 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 in an alternating manner; a dust filter is arranged at the end of each joint of the three-dimensional joint; and a flow valve (10) is arranged on each joint of the three-dimensional joint to independently control the pumping and discharging flow of each joint of the three-dimensional joint.

6. A method for treating hypoxia in a return air corner of a mine according to claim 5, characterized in that: A symmetrical respiratory isolation door (11) is arranged on each joint of the three-dimensional joint, two hinged door bodies of the symmetrical respiratory isolation door (11) are connected to a fixed anchor end via a spring (111), a blocking strip (112) is arranged on the inner side of the symmetrical respiratory isolation door (11), and a center seam sealing strip (113) is arranged in the middle of the two hinged door bodies of the symmetrical respiratory isolation door (11).

7. A method for treating hypoxia in a return air corner of a mine according to claim 1, characterized in that: The spray partition module comprises an inorganic spray machine A (19), an inorganic spray machine B (20), a mortar spray machine, an air cloth (222) and a steel frame (221); the material A sprayed by the inorganic spray machine A (19) and the material B sprayed by the inorganic spray machine B (20) collide with each other, mix and quickly solidify to form a flexible film (224); the mortar spray machine is used to spray the bottom ash inorganic mortar (223).

8. A method for treating low oxygen in return air corners in a mine according to claim 7, characterized in that: 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.

9. A method for treating hypoxia in a return air corner of a mine according to claim 7, characterized in that: The mortar spraying machine comprises a second pneumatic motor (12), a reducer (13), a hopper (14), an air-compressed thrust type high-blade spiral grading conveyor and a spray head; The air-compressed thrust type high-blade spiral grading conveyor comprises a first-stage high-blade spiral blade (15), a second-stage peristaltic spiral sleeve rod (16) and a third-stage variable pressure flow guide (17) which are sequentially arranged along the discharge direction; the first-stage high-blade spiral blade (15) performs shearing for the initial conveying, the second-stage peristaltic spiral sleeve rod (16) performs extrusion for the second conveying, and the third-stage variable pressure flow guide (17) realizes boosted conveying; The rotating shaft of the air-compression thrust type high-blade 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 guide device (17) to achieve gas phase-assisted solid and liquid phase particle acceleration.

10. A method for treating low oxygen in return air corners in a mine according to any one of claims 7 to 9, characterized in that: 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 crossing 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).

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