Gas adsorption detection device and method for coal mining

Abstract

The invention discloses a gas adsorption detection device and method for coal mining, and the device comprises two measuring pipes which are symmetrically arranged, the two measuring pipes are fixedly installed on a bottom frame, and a gas release valve is fixedly communicated with a gas release port at the top of each measuring pipe; the liquid changing system is communicated between the bottom openings of the two measuring pipes; and the gas discharging mechanism is fixedly arranged on a connecting beam connected between the two measuring pipes by adopting a supporting beam. According to the device, quantitative air is injected into the lower barrel shell, the introduced air is compressed and extruded upwards through the supercharger, so that gas in a coal sample hole is rushed out of the hole, and during the period, the push cylinder is started to drive the coal sample barrel piece to slide up and down in a circulating mode, so that the discharge rate of the gas adsorbed in the coal sample hole is increased; therefore, the detection error of the gas adsorption quantity is reduced.

Description

Technical Field

[0001] The present invention specifically relates to the technical field of coal mining, and in particular to a gas adsorption detection device and method for coal mining. Background Art

[0002] Coal mine gas is a mixed gas composed of methane, carbon dioxide and nitrogen that escapes from coal and surrounding rocks. During the coal mining process, especially in the rock layer with a porous structure, the amount of gas adsorption inside is difficult to survey. Therefore, it is necessary to sample coal and rock in each area and test the gas adsorption content in the coal and rock in each area through experiments. The existing detection method is only to extract the gas in the rock pores of the coal sample and then detect its composition to determine whether there is gas adsorption. However, this method cannot provide a basis for judging the amount of gas adsorption, and has a certain impact on the gas mining plan. If the gas adsorption in the area is too high, and the mining equipment cannot meet the extraction needs or there are large errors in the shaft excavation, it will cause gas overflow, which will cause suffocation or poisoning hazards to the surrounding workers. Summary of the invention

[0003] To this end, the present invention proposes a gas adsorption detection device and method suitable for coal mining to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a gas adsorption detection device for coal mining, comprising:

[0005] There are two measuring tubes, which are symmetrically arranged, and the two measuring tubes are fixedly mounted on the base frame, and the air release port at the top of each measuring tube is fixedly connected to an air release valve;

[0006] A liquid replacement system connected between the bottom openings of the two measuring tubes;

[0007] And a gas discharge mechanism, which is fixedly installed on a connecting beam connected between the two measuring tubes by using a support beam, the gas discharge mechanism is respectively connected to the top openings of the two measuring tubes through two gas pipes, and a manual valve is installed on each of the gas pipes. The gas discharge mechanism can discharge the gas adsorbed in the coal sample by pressurizing and discharge it into any one of the measuring tubes.

[0008] Further, preferably, each of the measuring tubes is made of transparent material, and a scale is provided on the side wall of each of the measuring tubes.

[0009] Further, preferably, the liquid replacement system comprises:

[0010] Two three-way valves are provided and are respectively connected to the bottom openings of the two measuring tubes;

[0011] Two liquid discharge pipes are provided and are respectively connected to the left ports of the two three-way valves, and each of the liquid discharge pipes is installed with a second manual valve;

[0012] And a liquid exchange pipe, which is connected between the right ports of the two three-way valves, and a manual valve three is installed at the middle position of the liquid exchange pipe.

[0013] Further, preferably, two liquid flow meters are installed on the liquid exchange pipe, and the two liquid flow meters are arranged in three symmetrical positions with respect to the manual valve.

[0014] Further, as a preference, the gas exhaust mechanism comprises:

[0015] A lower cylinder shell, a valve is fixedly installed at the bottom opening of the lower cylinder shell, and a supercharger is fixedly installed at the inner bottom of the lower cylinder shell;

[0016] An upper cylinder cover connected to the lower cylinder shell by a flange;

[0017] A coal sample cylinder, which is matched and slidably arranged in the lower cylinder shell, and one end of an extension rod is fixedly connected to the top surface of the coal sample cylinder;

[0018] And a push cylinder, which is fixedly mounted on the upper cylinder cover, wherein the driving end of the push cylinder extends into the upper cylinder cover and is fixedly connected to the other end of the extension rod.

[0019] Further, as a preference, the coal sample tube is composed of a top cap, a sample tube and two annular pressure caps, wherein a slip ring is fixedly sleeved on the side wall at the top of the sample tube, annular pressure caps are threadedly installed at the upper and lower ports of the sample tube, a top cap is fixedly installed on the top surface of the annular pressure cap located above, and a plurality of side holes are arranged in a circular array on the side wall of the top cap, and a screw hole threadedly connected to the bottom end of the extension rod is arranged on the top surface of the top cap;

[0020] Furthermore, rubber gaskets are fixedly arranged on opposite end surfaces of the two annular glands.

[0021] Further, as a preference, the sample tube adopts a double-layer tube structure, and an annular cavity is provided between the inner and outer tubes of the sample tube, an upper plug ring is fixed to the inner top of the annular cavity, a slidable lower plug ring is provided at the inner bottom of the annular cavity, and a rubber film is sealed and connected between the lower plug ring and the outer side wall of the upper plug ring;

[0022] The inner wall of the inner cylinder of the sample cylinder is provided with a plurality of small air holes, the outer wall of the inner cylinder of the sample cylinder is provided with large air holes, and an air flow channel is connected between the large air holes and the small air holes;

[0023] The side wall of the outer tube of the sample tube is provided with two symmetrically arranged slide grooves, and a slide rod is slidably arranged in the slide groove, one end of the slide rod is fixedly connected to the lower plug ring, and the other end of the slide rod extends outward, but a gap is left between the slide rod and the inner wall of the lower tube shell;

[0024] Wherein, a plurality of springs are connected between the lower plug ring and the upper plug ring.

[0025] Furthermore, as a preference, a retaining ring is fixed to the bottom of the inner wall of the lower cylinder shell. When the push cylinder drives the coal sample cylinder to slide down, the retaining ring can limit the sliding rod and make the lower plug ring slide toward the upper plug ring, thereby forming a pressurized gas and driving the gas in the horizontal rock hole of the coal sample to be discharged.

[0026] Further, as a preference, a pressure gauge communicating with the inner cavity thereof is installed on the side wall of each measuring tube.

[0027] The present invention also provides a method for detecting gas adsorption in coal mining by using the above-mentioned gas adsorption detection device for coal mining, which comprises the following steps:

[0028] Step 1: Close manual valve 1, air relief valve, manual valve 2 and manual valve 3, and then check the sealing of each part;

[0029] Step 2: Open manual valve 2, input an equal amount of pure water into the two measuring tubes through the drain pipe, and then close manual valve 2;

[0030] Step 3: Place the columnar coal sample into the sample cylinder, press the coal sample by screwing on two annular glands, then thread the extension rod to the top cap, slide the assembled coal sample cylinder into the lower cylinder shell, and then connect the lower cylinder shell to the upper cylinder cover through a flange;

[0031] Step 4: Open the manual valve 1 and manual valve 3 on the left, and then inject air into the lower shell. The introduced air is compressed by the supercharger and squeezed upward. During this period, the push cylinder is started to drive the coal sample cylinder to slide up and down cyclically, and the retaining ring and the slide rod are locked to drive the gas in the horizontal rock hole of the coal sample to be discharged along its longitudinal rock hole;

[0032] Step 5: The water in the measuring tube on the left is pressurized, and part of the water is discharged into the measuring tube on the right. After the gas injection is completed, observe the water levels in the two measuring tubes. If the volume of water discharged into the measuring tube on the right is less than or equal to the volume of the injected gas, it is judged that there is lower gas adsorption in the coal sample. If the volume of water discharged into the measuring tube on the right is greater than the volume of the injected gas, it is judged that there is higher gas adsorption in the coal sample.

[0033] The present invention adopts the above technology and has the following beneficial effects compared with the existing technology: in the device of the present invention, a certain amount of air is injected into the lower cylinder shell, and the introduced air is compressed by the supercharger and squeezed upward, so that the gas in the coal sample hole is flushed out of the hole. During this period, the push cylinder is started to drive the coal sample cylinder to slide up and down cyclically. On the one hand, when the coal sample cylinder slides down, two conflicting expulsion effects are formed to enhance the impact force, so as to cooperate with the gas in the coal sample hole to be discharged. On the other hand, the fluidity of the gas in the coal sample hole can be improved, so as to improve the discharge rate of the gas adsorbed in the coal sample hole, so as to reduce the detection error of the gas adsorption amount;

[0034] When the push cylinder drives the coal sample cylinder to slide down, the retaining ring can limit the sliding rod, so that the lower plug ring slides toward the upper plug ring, so that the gas between the upper plug ring and the lower plug ring is compressed and flows along the horizontal rock holes of the coal sample to the longitudinal rock holes. In this way, the gas in the horizontal rock holes of the coal sample is driven to be discharged by increasing the pressure, which can realize the multi-directional discharge of gas in the horizontal and vertical rock holes of the coal sample, thereby improving the gas discharge rate in the coal sample.

[0035] Instruction Manual

[0036] Figure 1 A schematic diagram of the three-dimensional structure of a gas adsorption detection device used in coal mining Figure 1 ;

[0037] Figure 2 A schematic diagram of the three-dimensional structure of a gas adsorption detection device used in coal mining Figure 2 ;

[0038] Figure 3 It is a rear view structural schematic diagram of a gas adsorption detection device for coal mining;

[0039] Figure 4 The figure is a schematic diagram of the internal structure of a gas discharge mechanism in a gas adsorption detection device for coal mining;

[0040] Figure 5 It is a structural cross-sectional view of a coal sample cylinder in a gas adsorption detection device used in coal mining;

[0041] Figure 6 for Figure 4 Enlarged schematic diagram of part A.

[0042] In the figure: 1. manual valve 1; 2. gas discharge mechanism; 3. gas transmission pipe; 4. vent valve; 5. measuring pipe; 6. drain pipe; 7. manual valve 2; 9. pressure gauge; 10. liquid flow meter; 11. manual valve 3; 12. liquid exchange pipe; 13. three-way valve; 14. connecting beam; 21. push cylinder; 22. upper cylinder cover; 23. extension rod; 24. lower cylinder shell; 25. supercharger; 26. side hole; 27. top cap; 28. annular pressure cover; 29. ​​sample cylinder; 30. upper plug ring; 31. spring; 32. lower plug ring; 33. slide rod; 34. small air hole; 35. large air hole; 36. air flow channel; 37. retaining ring. DETAILED DESCRIPTION

[0043] 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.

[0044] Example: Please refer to the attached Figure 1-6 The present invention provides a technical solution: a gas adsorption detection device for coal mining, comprising:

[0045] There are two measuring tubes 5, which are symmetrically arranged, and both measuring tubes 5 are fixedly mounted on the base frame, and the air release port at the top of each measuring tube 5 is fixedly connected to an air release valve 4;

[0046] A liquid replacement system, which is connected between the bottom openings of the two measuring tubes 5;

[0047] And a gas discharge mechanism 2, which is fixedly installed on a connecting beam 14 connected between two measuring tubes 5 by a support beam. The gas discharge mechanism 2 is connected to the top of the two measuring tubes 5 through two gas pipes 3, and a manual valve 1 is installed on each gas pipe 3. The gas discharge mechanism 2 can discharge the gas adsorbed in the coal sample by pressurization and discharge it into any one of the measuring tubes 5.

[0048] In this embodiment, each measuring tube 5 is made of transparent material, and a scale is arranged on the side wall of each measuring tube 5 .

[0049] In this embodiment, the liquid replacement system includes:

[0050] Two three-way valves 13 are provided and are respectively connected to the bottom openings of the two measuring tubes 5;

[0051] There are two drain pipes 6, which are connected to the left ports of the two three-way valves 13 respectively, and each drain pipe 6 is installed with a manual valve 2 7;

[0052] And a liquid exchange pipe 12, which is connected between the right ports of the two three-way valves 13, and a manual valve 3 11 is installed at the middle position of the liquid exchange pipe 12.

[0053] In this embodiment, two liquid flow meters 10 are installed on the liquid exchange pipe 12, and the two liquid flow meters 10 are symmetrically arranged about the manual valve 3 11.

[0054] In this embodiment, the gas exhaust mechanism 2 includes:

[0055] The lower cylinder shell 24 has a valve fixedly mounted at its bottom, and a supercharger 25 fixedly mounted at the inner bottom of the lower cylinder shell 24;

[0056] The upper cylinder cover 22 is connected to the lower cylinder shell 24 by a flange;

[0057] The coal sample cylinder is matched and slidably arranged in the lower cylinder shell 24, and one end of the extension rod 23 is fixedly connected to the top surface of the coal sample cylinder;

[0058] and a push cylinder 21, which is fixedly mounted on the upper cylinder cover 22, wherein the driving end of the push cylinder 21 extends into the upper cylinder cover 22 and is fixedly connected to the other end of the extension rod 23;

[0059] Specifically, a certain amount of air is injected into the lower cylinder shell 24, and the introduced air is compressed by the supercharger 25 and squeezed upward to flush the gas in the coal sample hole out of the hole. During this period, the push cylinder 21 is started to drive the coal sample cylinder to slide up and down cyclically. On the one hand, when the coal sample cylinder slides down, two conflicting expulsion effects are formed to cooperate in flushing the gas in the coal sample hole. On the other hand, the fluidity of the gas in the coal sample hole can be improved, thereby improving the discharge rate of the gas adsorbed in the coal sample hole.

[0060] In this embodiment, the coal sample tube is composed of a top cap 27, a sample tube 29 and two annular glands 28, wherein a slip ring is fixedly sleeved on the side wall of the top of the sample tube 29, and annular glands 28 are threadedly installed at the upper and lower ports of the sample tube 29, and a top cap 27 is fixedly installed on the top surface of the annular gland 28 located at the top, and a plurality of side holes 26 are arranged in a circumferential array on the side wall of the top cap 27, and a screw hole threadedly connected to the bottom end of the extension rod 23 is arranged on the top surface of the top cap 27;

[0061] Furthermore, rubber gaskets are fixedly disposed on opposite end surfaces of the two annular glands 28 .

[0062] In this embodiment, the sample cylinder 29 adopts a double-layer cylinder structure, and an annular cavity is provided between the inner and outer cylinders of the sample cylinder 29, an upper plug ring 30 is fixed to the inner top of the annular cavity, a slidable lower plug ring 32 is provided at the inner bottom of the annular cavity, and a rubber film is sealed between the lower plug ring 32 and the outer side wall of the upper plug ring 30;

[0063] The inner wall of the inner cylinder of the sample cylinder 29 is provided with a plurality of small air holes 34, the outer wall of the inner cylinder of the sample cylinder 29 is provided with large air holes 35, and an air flow channel 36 is connected between the large air holes 35 and the small air holes 34;

[0064] Two symmetrically arranged slide grooves are provided on the side wall of the outer tube of the sample tube 29, and a slide rod 33 is slidably arranged in the slide groove. One end of the slide rod 33 is fixedly connected to the lower plug ring 32, and the other end of the slide rod 33 extends outward, but a gap is left between the inner wall of the lower tube shell 24 to avoid friction.

[0065] A plurality of springs 31 are connected between the lower plug ring 32 and the upper plug ring 30 , and a certain distance is maintained between the lower plug ring 32 and the upper plug ring 30 by utilizing the tension of the springs 31 .

[0066] In this embodiment, a retaining ring 37 is fixed to the bottom of the inner wall of the lower cylinder shell 24. When the push cylinder 21 drives the coal sample cylinder to slide down, the retaining ring 37 can limit the sliding rod 33, so that the lower plug ring 32 slides toward the upper plug ring 30, so that the gas between the upper plug ring 30 and the lower plug ring 32 is compressed and flows along the horizontal rock holes of the coal sample to the longitudinal rock holes, thereby driving the gas in the horizontal rock holes of the coal sample to be discharged by increasing the pressure, and realizing the multi-directional discharge of gas in the horizontal and vertical rock holes of the coal sample, thereby improving the gas discharge rate in the coal sample.

[0067] In this embodiment, a pressure gauge 9 connected to the inner cavity of each measuring tube 5 is installed on the side wall thereof to observe the air pressure in the measuring tube 5 in real time as a safety guarantee.

[0068] The present invention also provides a method for detecting gas adsorption in coal mining by using the above-mentioned gas adsorption detection device for coal mining, which comprises the following steps:

[0069] Step 1: Close the manual valve 1, the air relief valve 4, the manual valve 2 7 and the manual valve 3 11, and then check the sealing of each part;

[0070] Step 2: Open the second manual valve 7, input an equal amount of pure water into the two measuring tubes 5 through the drain pipe 6, and then close the second manual valve 7;

[0071] Step 3: Place the columnar coal sample into the sample tube 29, press the coal sample by screwing on the two annular glands 28, then thread the extension rod 23 and the top cap 27, and slide the assembled coal sample tube into the lower tube shell 24, and then connect the lower tube shell 24 to the upper tube cover 22 through a flange;

[0072] Step 4: Open the manual valve 1 and the manual valve 3 11 on the left side, and then inject a certain amount of air into the lower cylinder shell 24, and compress the introduced air through the supercharger 25 and squeeze it upward. During this period, the push cylinder 21 is started to drive the coal sample cylinder to slide up and down cyclically, and the retaining ring 37 and the slide rod 33 are locked to drive the gas in the horizontal rock hole of the coal sample to be discharged along its longitudinal rock hole;

[0073] Step 5: The water in the measuring tube 5 on the left is pressurized, and part of the water is discharged into the measuring tube 5 on the right. After the gas injection is completed, observe the water levels in the two measuring tubes 5. If the volume of water discharged into the measuring tube 5 on the right is less than or equal to the volume of the injected gas, it is judged that there is lower gas adsorption in the coal sample. If the volume of water discharged into the measuring tube 5 on the right is greater than the volume of the injected gas, it is judged that there is higher gas adsorption in the coal sample.

[0074] It should be supplemented that any one of the two measuring pipes 5 can be used as a gas discharge pipe, and when in use, it is only necessary to open the corresponding manual valve 1.

[0075] 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 gas adsorption detection device for coal mining, characterized in that: It includes: Two measuring tubes (5) are provided and symmetrically arranged, and both measuring tubes (5) are fixedly mounted on the base frame, and the air release port at the top of each measuring tube (5) is fixedly connected to an air release valve (4); A liquid replacement system, which is connected between the bottom openings of the two measuring tubes (5); and a gas discharge mechanism (2), which is fixedly mounted on a connecting beam (14) connected between the two measuring tubes (5) by means of a support beam; the gas discharge mechanism (2) is respectively connected to the top openings of the two measuring tubes (5) through two gas pipes (3), and a manual valve (1) is installed on each of the gas pipes (3); the gas discharge mechanism (2) can discharge the gas adsorbed in the coal sample by means of a pressurization method and discharge it into any one of the measuring tubes (5).

2. A gas adsorption detection device for coal mining according to claim 1, characterized in that: Each of the measuring tubes (5) is made of transparent material, and a scale is arranged on the side wall of each of the measuring tubes (5).

3. A gas adsorption detection device for coal mining according to claim 1, characterized in that: The liquid replacement system comprises: Two three-way valves (13) are provided and are respectively connected to the bottom openings of the two measuring tubes (5); Two liquid discharge pipes (6) are provided and are respectively connected to the left ports of the two three-way valves (13), and each of the liquid discharge pipes (6) is installed with a second manual valve (7); And a liquid exchange pipe (12), which is connected between the right ports of the two three-way valves (13), and a manual valve three (11) is installed at the middle position of the liquid exchange pipe (12).

4. A gas adsorption detection device for coal mining according to claim 3, characterized in that: Two liquid flow meters (10) are installed on the liquid exchange pipe (12), and the two liquid flow meters (10) are symmetrically arranged with respect to the manual valve three (11).

5. A gas adsorption detection device for coal mining according to claim 1, characterized in that: The gas discharge mechanism (2) comprises: A lower cylinder shell (24) has a valve fixedly mounted at its bottom opening, and a supercharger (25) fixedly mounted at the inner bottom of the lower cylinder shell (24); An upper cylinder cover (22) is connected to the lower cylinder shell (24) by a flange; A coal sample cylinder, which is matched and slidably arranged in the lower cylinder shell (24), and one end of an extension rod (23) is fixedly connected to the top surface of the coal sample cylinder; And a push cylinder (21) which is fixedly mounted on the upper cylinder cover (22), wherein the driving end of the push cylinder (21) extends into the upper cylinder cover (22) and is fixedly connected to the other end of the extension rod (23).

6. A gas adsorption detection device for coal mining according to claim 5, characterized in that: The coal sample tube is composed of a top cap (27), a sample tube (29) and two annular pressure caps (28), wherein a slip ring is fixedly sleeved on the side wall of the top of the sample tube (29), annular pressure caps (28) are threadedly installed at the upper and lower ports of the sample tube (29), a top cap (27) is fixedly installed on the top surface of the annular pressure cap (28) located at the top, and a plurality of side holes (26) are arranged in a circumferential array on the side wall of the top cap (27), and a screw hole threadedly connected to the bottom end of the extension rod (23) is arranged on the top surface of the top cap (27); Furthermore, rubber gaskets (30) are fixedly arranged on opposite end surfaces of the two annular glands (28).

7. A gas adsorption detection device for coal mining according to claim 6, characterized in that: The sample cylinder (29) adopts a double-layer cylinder structure, and an annular cavity is arranged between the inner and outer cylinders of the sample cylinder (29), an upper plug ring (30) is fixed to the inner top of the annular cavity, a slidable lower plug ring (32) is arranged at the inner bottom of the annular cavity, and a rubber film is sealed between the lower plug ring (32) and the outer side wall of the upper plug ring (30); The inner wall of the inner cylinder of the sample cylinder (29) is provided with a plurality of small air holes (34), the outer wall of the inner cylinder of the sample cylinder (29) is provided with large air holes (35), and an air flow channel (36) is connected between the large air holes (35) and the small air holes (34); The side wall of the outer cylinder of the sample cylinder (29) is provided with two symmetrically arranged sliding grooves, and a sliding rod (33) is slidably arranged in the sliding groove, one end of the sliding rod (33) is fixedly connected to the lower plug ring (32), and the other end of the sliding rod (33) extends outward, but a gap is left between the sliding rod (33) and the inner wall of the lower cylinder shell (24); Wherein, a plurality of springs (31) are connected between the lower plug ring (32) and the upper plug ring (30).

8. A gas adsorption detection device for coal mining according to claim 7, characterized in that: A retaining ring (37) is fixed to the bottom of the inner wall of the lower cylinder shell (24). When the push cylinder (21) drives the coal sample cylinder to slide down, the retaining ring (37) can limit and lock the sliding rod (33), so that the lower plug ring (32) slides toward the upper plug ring (30), thereby forming a pressurized gas and driving the gas in the horizontal rock hole of the coal sample to be discharged.

9. A gas adsorption detection device for coal mining according to claim 1, characterized in that: A pressure gauge (9) communicating with the inner cavity of each measuring tube (5) is installed on the side wall of the measuring tube (5).

10. A method for detecting gas adsorption in coal mining using the gas adsorption detection device for coal mining according to claim 1, characterized in that: It includes the following steps: Step 1: Close manual valve 1 (1), air relief valve (4), manual valve 2 (7) and manual valve 3 (11), and then check the tightness of each part; Step 2: Open the second manual valve (7), input an equal amount of pure water into the two measuring tubes (5) through the discharge pipe (6), and then close the second manual valve (7); Step 3: Place the columnar coal sample into the sample tube (29), press the coal sample tightly by screwing on two annular glands (28), then thread the extension rod (23) and the top cap, and slide the assembled coal sample tube into the lower tube shell (24), and then connect the lower tube shell (24) to the upper tube cover (22) through a flange; Step 4: Open the manual valve 1 (1) and the manual valve 3 (11) on the left side, and then inject air into the lower cylinder shell (24). The introduced air is compressed by the supercharger (25) and squeezed upward. During this period, the push cylinder (21) is started to drive the coal sample cylinder to slide up and down in a cyclic manner, and the retaining ring (37) and the slide rod (33) are locked to drive the gas in the horizontal rock hole of the coal sample to be discharged along its longitudinal rock hole; Step 5: The water liquid in the left measuring tube (5) is pressurized, and part of the water liquid is discharged into the right measuring tube (5). After the gas injection is completed, the water liquid levels in the two measuring tubes (5) are observed. If the volume of the water liquid discharged into the right measuring tube (5) is less than or equal to the volume of the injected gas, it is judged that the coal sample has a lower gas adsorption. If the volume of the water liquid discharged into the right measuring tube (5) is greater than the volume of the injected gas, it is judged that the coal sample has a higher gas adsorption.

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