Testing device for simulating ultralow-concentration methane adsorption of total return airway and testing method thereof

Abstract

The invention provides an ultra-low-concentration methane adsorption testing device for simulating a total return airway and a testing method thereof.The device comprises a sample containing box assembly, a humidity supply system, a gas supply system, a mine dust supply system and a gas detection system, mine dust in a mine dust box is sent to a box body through a draught fan and a mine dust pipeline, and the high-dust and high-air-flow environment of the total return airway is simulated; a gas supply system is connected below the sample placing box to simulate a total return airway gas environment; and the gas chromatography detection system is connected to the right lower part of the box body and is used for analyzing the ultralow-concentration methane adsorption capability of the material in the sample placing box. The device is reasonable in design and easy and convenient to operate, the high-humidity and high-dust real environment of the total return air flow can be simulated, the adsorption performance and environmental adaptability of materials in the environment of the total return air way to the ultra-low-concentration methane are mastered, and therefore feasible help is provided for further achieving treatment and utilization of the ultra-low-concentration methane in the high-humidity and high-dust environment of the total return air flow of the mine.

Description

Technical Field

[0001] The invention belongs to the technical field of adsorption testing devices, and in particular relates to an ultra-low concentration methane adsorption testing device simulating a total return air channel and a testing method thereof. Background Art

[0002] At present, the control, collection and recovery of methane gas in mines are mainly aimed at high-concentration methane gas ≥30%, while the ultra-low-concentration methane with a volume fraction of less than 1% is difficult to utilize. In addition, the total return airflow in mines has high humidity, a lot of dust, and complex gas components, which further increases the technical difficulty of recovering and utilizing ultra-low-concentration methane. Therefore, realizing the disposal and utilization of ultra-low-concentration methane in the high-humidity and high-dust environment of the total return airflow in mines has important theoretical and practical significance for the coordinated greenhouse gas emission reduction of energy resource utilization.

[0003] After searching, the Chinese patent with patent number CN103510977A discloses a combined oxidation bed of a coal mine ventilation countercurrent catalytic oxidation device, which is composed of a heat storage ceramic bed and a catalytic oxidation bed, and can improve the methane oxidation rate. However, the device needs to provide a certain temperature during the catalytic oxidation process and is not suitable for use in the total return air lane environment of the mine; and the adsorption separation technology has the advantages of low energy consumption, high safety, and flexible operation, and has been widely studied in the efficient recovery and low-cost utilization of low-concentration methane; the Chinese patent with patent number CN105312026A discloses a metal organic framework-activated carbon ceramic composite material for efficient methane adsorption at room temperature, which is suitable for methane pressure swing adsorption separation, low-concentration methane recovery and other fields; the Chinese patent with patent number CN107126928A discloses a pure silicon ZSM-5 / activated carbon composite adsorbent, which has the ability to improve the selective separation of methane / nitrogen, thereby achieving the enrichment of low-concentration methane.

[0004] The existing adsorption and separation materials have achieved the effect of enriching low-concentration methane to a certain extent, but the performance of the adsorption and separation materials is easily affected by the coupling of multiple factors such as humidity, dust concentration, and gas flow rate in the total return air flow of the mine, which poses new challenges to the disposal and utilization of low-concentration methane in the mine. Therefore, the impact of environmental factors in the total return airway of the mine on methane selective adsorption materials cannot be ignored. Based on this, a simulated total return airway ultra-low concentration methane adsorption test device and its test method are proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a simulated total return air lane ultra-low concentration methane adsorption test device and a test method thereof in view of the deficiencies of the above-mentioned prior art, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] In the first aspect, a simulated total return air lane ultra-low concentration methane adsorption test device is characterized by comprising a sample box assembly, a humidity supply system, a gas supply system, a mine dust supply system and a gas detection system;

[0008] The sample placement box assembly comprises a sealed sample placement box, a mist spray head connected to the humidity supply system is provided above the sample placement box, a dust supply pipe connected to the mine dust supply system is provided on the sample placement box, an air inlet valve connected to the gas supply system is provided near the bottom of the sample placement box, and a coarse air guide pipe connected to the gas detection system is provided on the sample placement box;

[0009] The humidity supply system includes a thick liquid guide tube, a thin liquid guide tube, a liquid injection controller and a pure water bottle, wherein the thick liquid guide tube is used to complete the connection between the mist spray head and the liquid injection controller, and the thin liquid guide tube is used to complete the connection between the liquid injection controller and the pure water bottle;

[0010] The gas supply system comprises a first high-pressure gas cylinder, a second high-pressure gas cylinder, a third high-pressure gas cylinder, a gas control group, a pipeline, a premixing tank, a vacuum pressure pump and a first valve. The first high-pressure gas cylinder, the second high-pressure gas cylinder and the third high-pressure gas cylinder are respectively connected with a gas control group. The gas control group is composed of a pressure gauge, a mass flow meter and a pressure reduction controller connected to each other. The connection between each gas control group and the premixing tank is completed through the pipeline. The other end of the premixing tank is connected to the air inlet valve. The first valve is provided on the connecting passage between the vacuum pressure pump and the sample box;

[0011] The mine dust supply system comprises a dust supply box, a dust hood, a dust supply pipe and a fan check valve. The dust supply box is provided with a dust hood, the dust hood is connected to the inside of the sample box through the dust supply pipe, and a fan is provided in the middle of the dust supply pipe;

[0012] The gas detection system comprises a gas collecting bottle, a thick gas pipe, a thin gas pipe, and a gas chromatograph. One end of the gas collecting bottle is connected to a sample box through the thick gas pipe, and the other end of the gas collecting bottle is connected to the gas chromatograph through the thin gas pipe.

[0013] As a further explanation of the present invention, the sample box is configured as a hollow semi-circular arch structure, and fan blades are installed below the dust supply pipe in the sample box. The rotation of the fan blades allows the mineral dust to cover the sample box. A single-layer gauze is also provided in the sample box, and a sealing cover communicating with the hollow part is provided at the front end of the sample box.

[0014] As a further explanation of the present invention, a humidity detector is also provided in the sample placing box, and the humidity value of the air environment in the sample placing box is detected by the humidity detector.

[0015] As a further illustration of the present invention, the first high-pressure gas cylinder, the second high-pressure gas cylinder, and the third high-pressure gas cylinder respectively store gases required for the experiment, and the gases required for the experiment are proportioned by controlling the opening and closing of the gas cylinders by gas cylinder valves according to the set gas ratios of the experiment.

[0016] As a further illustration of the present invention, the gas required for the experiment is specifically methane, oxygen, nitrogen or helium.

[0017] As a further illustration of the present invention, a non-parallel channel structure is provided in the premixing tank for mixing the gases required for the experiment.

[0018] As a further explanation of the present invention, a check valve is provided on one side of the dust supply pipe close to the sample placement box, and the check valve prevents the mine dust from re-entering the dust supply box through the dust supply pipe.

[0019] As a further illustration of the present invention, a dustproof gasket net is also provided on one side of the thick air duct close to the inner wall of the sample placement box.

[0020] In a second aspect, a test method for simulating an ultra-low concentration methane adsorption test device in a total return air channel comprises the following steps:

[0021] S1. Connect the humidity supply system, gas supply and disposal system, mine dust supply system and gas detection system to the sample box respectively, and check whether the air tightness of the sample box is qualified;

[0022] S2. After the air tightness test is passed, the sealing cover is opened, and the adsorbent material sample is placed on the single-layer gauze in the sample box. The vacuum pressure pump in the gas supply and disposal system is started to degas the sample box. After the degassing is completed, helium is introduced using the first high-pressure gas cylinder, the second high-pressure gas cylinder or the third high-pressure gas cylinder to measure the free space volume in the sample box and perform volume calibration;

[0023] S3. Simulate the high humidity environment of the total return air duct, start the humidity supply system to spray pure water into the sample box to form a uniform mist, and adjust the humidity of the environment in the sample box by the liquid injection controller. The relative humidity range is 70% to 100%. Combined with the humidity detectors on both sides of the sample box, the humidity in the sample box is monitored to reach the preset humidity value of the experiment; simulate the high dust environment of the total return air duct, start the mineral dust supply system to introduce the preset mineral dust into the sample box, and the mineral dust concentration is set to 15mg / m 3 ~45 mg / m 3 The fan blades are rotated to make the dust sprayed from the dust supply pipe cover the entire inner cavity of the sample box, and the check valve prevents the dust from flowing back into the dust supply box;

[0024] S4. Start the gas supply and disposal system. According to the experimental setting of the gas ratio, the gas cylinder valve controls the opening and closing of the first high-pressure gas cylinder, the second high-pressure gas cylinder, and the third high-pressure gas cylinder to perform gas ratio, and introduce the gas into the premixing tank for full mixing. Open the air inlet valve and continuously introduce the total return air lane gas components into the sample box. The gas components include methane, oxygen, nitrogen, and helium. The gas ratio is proportioned according to the experimental setting.

[0025] S5. Start the gas detection system, collect the gas in the sample box, detect the change of gas concentration in the sample box through gas chromatograph, calculate the data, and understand the adsorption performance of the adsorption material for ultra-low concentration methane in the high humidity and high dust environment of the total return air duct.

[0026] As a further illustration of the present invention, the adsorption material sample is specifically at least one of MOFs, molecular sieves, porous carbon and composite adsorbents.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] 1. The present invention can simulate the influence of different humidity, dust concentration, gas components, etc. in the total return air lane on the performance of the adsorption material. The uniform mist formed by the mist spray head spraying pure water above the cavity and the humidity detector for detecting the humidity value of the air environment in the cavity can simulate the different humidity environments in the total return air lane; the mine dust supply system and the fan make the mine dust cover the cavity, simulating the different mine dust concentration environments in the total return air lane; the gas supply and disposal system simulates the different gas concentration environments in the total return air lane by adjusting the gas components; the hollow semicircular arch structure similar to the total return air lane is adopted, so that the experimental environment is more in line with the high humidity and high dust environment of the total return air lane, which is convenient for improving the accuracy of the data.

[0029] 2. The device of the present invention is reasonably designed, simple to operate and can be reused. By simulating the real environment of the total return air channel of a mine and combining it with a gas detection system, it is easy to grasp the adaptability of the adsorption material in the total return air channel environment and the methane enrichment effect, thereby providing feasibility for further realizing the low-cost disposal and utilization of ultra-low concentration methane in the high-humidity and high-dust environment of the total return air flow of the mine. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of a forward section of a sample placement box of the present invention;

[0032] Figure 3 It is a schematic diagram of a radial section of a sample placement box of the present invention;

[0033] Figure 4 is a schematic diagram of a forward cross-section of a mine dust supply system of the present invention;

[0034] Figure 5 It is a schematic diagram of the planar structure of the premixing tank fully mixing gas in the gas supply system of the present invention;

[0035] Figure 6 It is a methane adsorption curve diagram of the experimental coal sample according to the embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 1-sample box, 2-mist spray head, 3-dust supply pipeline, 4-air inlet valve, 5-coarse air duct, 6-fan blades, 7-single-layer gauze, 8-sealing cover, 9-humidity detector, 10-coarse liquid duct, 11-thin liquid duct, 12-liquid injection controller, 13-pure water bottle, 14-first high-pressure gas cylinder; 15-second high-pressure gas cylinder; 16-third high-pressure gas cylinder; 17-pressure gauge, 18-mass flow meter, 19-pressure reduction controller, 20-pipeline, 21-premix tank, 22-vacuum pressure pump, 23-first valve, 24-dust supply box, 25-dust hood, 26-fan, 27-check valve, 28-gas collecting bottle, 29-thin air duct, 30-dustproof gasket net, 31-gas chromatograph. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Examples, such as Figure 1-5 As shown, the present invention provides a technical solution: a simulated total return air lane ultra-low concentration methane adsorption test device, including a sample box assembly, a humidity supply system, a gas supply system, a mine dust supply system and a gas detection system;

[0040] Among them, the sample placing box assembly includes a closed sample placing box 1, which is configured as a hollow semicircular arch structure, and a fan blade 6 is also installed below the dust supply pipe 3 in the sample placing box 1. The fan blade 6 rotates to make the mine dust cover the sample placing box 1. A single-layer gauze 7 is also provided in the sample placing box 1. The single-layer gauze 7 is made of stainless steel and is used to filter mine dust, coal dust and place adsorption materials. A sealing cover 8 communicating with the hollow part is provided at the front end of the sample placing box 1.

[0041] A mist spray head 2 connected to the humidity supply system is provided above the sample box 1, a dust supply pipe 3 connected to the mine dust supply system is also provided on the sample box 1, an air inlet valve 4 connected to the gas supply system is provided near the bottom of the sample box 1, and a coarse air guide pipe 5 connected to the gas detection system is also provided on the sample box 1;

[0042] The sample box 1 is also provided with a humidity detector 9, which is used to detect the humidity value of the air environment in the sample box 1.

[0043] The humidity supply system includes a thick liquid guide tube 10, a thin liquid guide tube 11, a liquid injection controller 12 and a pure water bottle 13. The thick liquid guide tube 10 is used to complete the connection between the mist spray head 2 and the liquid injection controller 12, and the thin liquid guide tube 11 is used to complete the connection between the liquid injection controller 12 and the pure water bottle 13.

[0044] The gas supply system includes a first high-pressure gas cylinder 14, a second high-pressure gas cylinder 15, a third high-pressure gas cylinder 16, a gas control group, a pipeline 20, a premixing tank 21, a vacuum pressure pump 22 and a first valve 23. The first high-pressure gas cylinder 14, the second high-pressure gas cylinder 15 and the third high-pressure gas cylinder 16 are respectively connected with a gas control group, and the gas control group is composed of a pressure gauge 17, a mass flow meter 18 and a pressure reduction controller 19 connected to each other. The communication between each gas control group and the premixing tank 21 is completed through the pipeline 20. The other end of the premixing tank 21 is connected to the air inlet valve 4. The first valve 23 is provided on the communication passage between the vacuum pressure pump 22 and the sample box 1;

[0045] The first high-pressure gas cylinder 14, the second high-pressure gas cylinder 15, and the third high-pressure gas cylinder 16 respectively store gases required for the experiment, and the gases required for the experiment are proportioned by controlling the opening and closing of the gas cylinders by gas cylinder valves according to the set gas ratio of the experiment.

[0046] The gas required for the experiment is specifically methane, oxygen, nitrogen or helium.

[0047] The mine dust supply system includes a dust supply box 24, a dust hood 25, a dust supply pipe 3 and a fan 26 check valve 27. The dust supply box 24 is provided with a dust hood 25, and the dust hood 25 is connected with the inside of the sample box 1 through the dust supply pipe 3. A fan 26 is provided in the middle of the dust supply pipe 3. A check valve 27 is provided on the side of the dust supply pipe 3 close to the sample box 1. The check valve 27 prevents the mine dust from entering the dust supply box 24 again through the dust supply pipe 3.

[0048] The gas detection system includes a gas collecting bottle 28, a thick gas pipe 5, a thin gas pipe 29, and a gas chromatograph 31. One end of the gas collecting bottle 28 is connected to the sample box 1 through the thick gas pipe 5, and the other end of the gas collecting bottle 28 is connected to the gas chromatograph 31 through the thin gas pipe 11. A dustproof gasket net 30 is also provided on one side of the thick gas pipe 5 close to the inner wall of the sample box 1.

[0049] The premixing tank 21 is provided with a non-parallel channel structure for mixing the gases required for the experiment.

[0050] The above-mentioned test method of a simulated total return air lane ultra-low concentration methane adsorption test device comprises the following steps:

[0051] S1. Connect the humidity supply system, gas supply and disposal system, mine dust supply system and gas detection system to the sample box 1 respectively, and check whether the air tightness of the sample box 1 is qualified;

[0052] S2. After the air tightness test is qualified, the sealing cover 8 is opened, and the adsorbent material sample is placed on the single-layer gauze 7 in the sample box 1. The adsorbent material sample is specifically one of MOFs, molecular sieves, porous carbon and composite adsorbents. The vacuum pressure pump 22 in the gas supply and disposal system is started to degas the sample box 1. After the degassing is completed, helium in the first high-pressure gas cylinder 14, the second high-pressure gas cylinder 15 or the third high-pressure gas cylinder 16 is introduced to measure the free space volume in the sample box 1 and perform volume calibration;

[0053] S3, simulate the high humidity environment of the total return air duct, start the humidity supply system to spray pure water into the sample box 1 to form a uniform mist, and adjust the humidity of the environment in the sample box 1 by the injection controller 12. The relative humidity range is 70% to 100%. Combined with the humidity detectors 9 on both sides of the sample box 1, the humidity in the sample box 1 is monitored to reach the preset humidity value of the experiment; simulate the high dust environment of the total return air duct, start the mineral dust supply system to introduce the preset mineral dust into the sample box 1, and the mineral dust concentration is set to 15mg / m 3 ~45 mg / m 3 , by rotating the fan blades 6, the mineral dust ejected from the dust supply pipe 3 fills the entire inner cavity of the sample placement box 1, and the check valve 27 prevents the mineral dust from flowing back into the dust supply box 24;

[0054] S4, start the gas supply and disposal system, and control the opening and closing of the first high-pressure gas cylinder 14, the second high-pressure gas cylinder 15, and the third high-pressure gas cylinder 16 by the gas cylinder valve according to the gas ratio set in the experiment to perform gas proportioning, and introduce the gas into the premixing tank 21 for full mixing, open the air inlet valve 4, and continuously introduce the total return air lane gas components into the sample box 1, the gas components include methane, oxygen, nitrogen, and helium, and the gas ratio is proportioned according to the experimental setting;

[0055] S5. Start the gas detection system, collect the gas in the sample box 1, detect the change of gas concentration in the sample box 1 through the gas chromatograph 31, calculate the data, and understand the adsorption performance of the adsorption material for ultra-low concentration methane in the high humidity and high dust environment of the total return air channel.

[0056] In an experimental example, 100 g of each experimental coal sample with a particle size of <0.9 mm, 0.9-3 mm, 3-5 mm, 5-7 mm and 7-10 mm is taken to make a 500 g mixed coal sample, which is loaded into a sample box 1 and placed on a single layer of gauze 7 in the sample box 1.

[0057] After vacuum degassing, helium was introduced for 30 min at a helium flow rate of 80 mL / min for volume calibration. The experimental temperature was set to 308 K, the humidity supply system was adjusted to adjust the relative humidity of the chamber to 70%, and the mineral dust supply system was set to 15 mg / m 3 , open the gas supply and disposal system, fill the cavity with a uniform mixture of 0.75% methane, 21% oxygen, 0.25% carbon dioxide, and 78% nitrogen at a gas intake rate of 20 mL / min, and detect changes in gas concentration in the cavity by gas chromatograph.

[0058] The CH4 gas adsorption amount and adsorption pressure in coal are consistent with the Langmuir equation. The experimental results are as follows: Figure 6 As shown, where: Q is the gas adsorption amount, mmol / g.

[0059] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for testing ultra-low concentration methane adsorption in a simulated total return air lane, characterized in that: It includes sample box assembly, humidity supply system, gas supply system, mine dust supply system and gas detection system; The sample placement box assembly comprises a sealed sample placement box (1), a mist spray head (2) connected to a humidity supply system is arranged above the sample placement box (1), a dust supply pipe (3) connected to a mine dust supply system is also arranged on the sample placement box (1), an air intake valve (4) connected to a gas supply system is arranged near the bottom of the sample placement box (1), and a rough air guide pipe (5) connected to a gas detection system is also arranged on the sample placement box (1); The humidity supply system comprises a thick liquid guide tube (10), a thin liquid guide tube (11), a liquid injection control instrument (12) and a pure water bottle (13); the thick liquid guide tube (10) is used to complete the connection between the mist spray head (2) and the liquid injection control instrument (12), and the thin liquid guide tube (11) is used to complete the connection between the liquid injection control instrument (12) and the pure water bottle (13); The gas supply system comprises a first high-pressure gas cylinder (14), a second high-pressure gas cylinder (15), a third high-pressure gas cylinder (16), a gas control group, a pipeline (20), a premixing tank (21), a vacuum pressure pump (22) and a first valve (23); the first high-pressure gas cylinder (14), the second high-pressure gas cylinder (15) and the third high-pressure gas cylinder (16) are respectively connected to the gas control group; the gas control group is composed of a pressure gauge (17), a mass flow meter (18) and a pressure reduction controller (19) connected to each other; the communication between each gas control group and the premixing tank (21) is completed through the pipeline (20); the other end of the premixing tank (21) is connected to the air inlet valve (4); the first valve (23) is provided on the communication passage between the vacuum pressure pump (22) and the sample box (1); The mine dust supply system comprises a dust supply box (24), a dust hood (25), a dust supply pipe (3) and a check valve (27) for a fan (26); a dust hood (25) is provided in the dust supply box (24); the dust hood (25) is connected to the inside of the sample placement box (1) through the dust supply pipe (3); and a fan (26) is provided in the middle of the dust supply pipe (3); The gas detection system comprises a gas collecting bottle (28), a thick gas pipe (5), a thin gas pipe (29), and a gas chromatograph (31); one end of the gas collecting bottle (28) is connected to a sample placement box (1) via the thick gas pipe (5), and the other end of the gas collecting bottle (28) is connected to the gas chromatograph (31) via the thin gas pipe (11).

2. The device for testing ultra-low concentration methane adsorption in a simulated total return air channel according to claim 1, characterized in that: The sample placing box (1) is configured as a hollow semicircular arch structure, and a fan blade (6) is installed below the dust supply pipe (3) in the sample placing box (1), and the rotation of the fan blade (6) allows the mineral dust to fill the sample placing box (1). A single-layer gauze (7) is also provided in the sample placing box (1), and a sealing cover (8) communicating with the hollow part is provided at the front end of the sample placing box (1).

3. The ultra-low concentration methane adsorption test device for simulating total return air lane according to claim 1 is characterized in that: The sample placement box (1) is also provided with a humidity detector (9), and the humidity value of the air environment in the sample placement box (1) is detected by the humidity detector (9).

4. The ultra-low concentration methane adsorption test device for simulating total return air lane according to claim 1 is characterized in that: The first high-pressure gas cylinder (14), the second high-pressure gas cylinder (15), and the third high-pressure gas cylinder (16) respectively store gases required for the experiment, and the gases required for the experiment are proportioned by controlling the opening and closing of the gas cylinders by gas cylinder valves according to the gas ratio set in the experiment.

5. The ultra-low concentration methane adsorption test device for simulating total return air lane according to claim 4 is characterized in that: The gas required for the experiment is specifically methane, oxygen, nitrogen or helium.

6. The ultra-low concentration methane adsorption test device for simulating total return air lane according to claim 4 is characterized in that: The premixing tank (21) is provided with a non-parallel channel structure for mixing the gases required for the experiment.

7. The device for testing ultra-low concentration methane adsorption in a simulated total return air lane according to claim 1, characterized in that: A check valve (27) is provided on one side of the dust supply pipe (3) close to the sample placement box (1), and the check valve (27) prevents the mine dust from passing through the dust supply pipe (3) and entering the dust supply box (24) again.

8. The device for testing ultra-low concentration methane adsorption in a simulated total return air lane according to claim 1, characterized in that: A dustproof gasket net (30) is also provided on one side of the coarse air guide pipe (5) close to the inner wall of the sample placement box (1).

9. A test method for simulating ultra-low concentration methane adsorption test equipment in total return air lane according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Connect the humidity supply system, the gas supply and disposal system, the mine dust supply system, and the gas detection system to the sample placement box (1) respectively, and check whether the air tightness of the sample placement box (1) is qualified; S2. After the air tightness test is passed, the sealing cover (8) is opened, and the adsorbent material sample is placed on the single-layer gauze (7) in the sample box (1). The vacuum pressure pump (22) in the gas supply and disposal system is started to degas the sample box (1). After the degassing is completed, helium is introduced using the first high-pressure gas cylinder (14), the second high-pressure gas cylinder (15) or the third high-pressure gas cylinder (16), and the free space volume in the sample box (1) is measured to perform volume calibration; S3, simulating the high humidity environment of the total return air channel, starting the humidity supply system to spray pure water into the sample box (1) to form a uniform mist, and adjusting the humidity of the environment in the sample box (1) by the liquid injection controller (12), with the relative humidity range of 70% to 100%, and combining with the humidity detectors (9) on both sides of the sample box (1) to monitor the humidity of the environment in the sample box (1) to reach the preset humidity value of the experiment; To simulate the high dust environment in the main return airway, start the dust supply system and introduce the preset dust into the sample box (1). The dust concentration is set to 15 mg / m 3 ~45 mg / m 3 , by rotating the fan blades (6), the mineral dust ejected from the dust supply pipe (3) covers the entire inner cavity of the sample placement box (1), and the check valve (27) prevents the mineral dust from flowing back into the dust supply box (24); S4, start the gas supply and disposal system, control the opening and closing of the first high-pressure gas cylinder (14), the second high-pressure gas cylinder (15), and the third high-pressure gas cylinder (16) by the gas cylinder valve according to the gas ratio set in the experiment to perform gas proportioning, introduce the gas into the premixing tank (21) for full mixing, open the air inlet valve (4), and continuously introduce the total return air lane gas components into the sample box (1), the gas components include methane, oxygen, nitrogen, and helium, and the gas ratio is proportioned according to the experimental setting; S5. Start the gas detection system, collect the gas in the sample box (1), detect the change of gas concentration in the sample box (1) by the gas chromatograph (31), calculate the data, and understand the adsorption performance of the adsorption material for ultra-low concentration methane in the high humidity and high dust environment of the total return air channel.

10. The test method of a simulated total return air lane ultra-low concentration methane adsorption test device according to claim 9, characterized in that: The adsorption material sample is specifically at least one of MOFs, molecular sieves, porous carbon and composite adsorbents.

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