Coal sample can for coal sample gas adsorption experiment

Abstract

This utility model discloses a coal sample container for a coal sample gas adsorption experiment, comprising a container body, an opening at the top of the container body sealed to a cover, and an inlet pipe, an outlet pipe, and a pressure gauge spaced apart on the cover. Valves are installed on the inlet and outlet pipes, and the inlet, outlet, and pressure gauge are respectively connected to the interior of the container body. After coal is sampled, the container is promptly placed inside and the cover is sealed to prevent the loss of adsorbed methane gas from the coal sample. Before testing the coal sample, methane gas is introduced into the container through the inlet pipe to bring the pressure inside the container to the pressure before coal seam mining. The resulting test results more accurately reflect the actual situation of methane adsorption in the coal seam.

Description

Technical Field

[0001] This utility model relates to the technical field of coal seam sampling equipment, and more specifically, to a coal sample container for a coal sample gas adsorption experiment. Background Technology

[0002] Coalbed methane, also known as coal seam gas, is a mixture of gases, mainly composed of methane, carbon dioxide, and nitrogen, that escape from coal. Methane is a harmful factor in coal mining, and when the concentration of methane in the air is between 5% and 16%, it can easily ignite upon contact with an open flame, causing serious accidents.

[0003] Gas exists in coal seams primarily in two states: free gas, which exists in the macroscopic fractures and pores of the coal seam and exists in a free gaseous state; and adsorbed gas, which is mainly adsorbed on the inner surface of the micropores of the coal and in the micropores inside the coal matrix. During coal mining, as the coal seam pressure decreases, the gas originally adsorbed on the coal body will desorb and transform into free gas. To effectively prevent gas explosion accidents during coal mining, it is necessary to sample the coal seam and determine key parameters such as the amount of adsorbed gas, the initial gas release velocity, and the desorption rate of the coal in the laboratory.

[0004] When sampling coal seams, the samples need to be placed in a sample container to prevent the release of methane adsorbed on the coal sample when the sample is exposed to air, which would affect the accuracy of the sample measurement data. However, during the coal seam mining and sampling process, some of the methane in the coal seam has already been released, and the data cannot truly reflect the situation of methane adsorption by coal in the coal seam.

[0005] Therefore, it is necessary to propose a coal sample container for coal sample gas adsorption experiments to solve the problems existing in the prior art. Utility Model Content

[0006] The utility model description section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0007] To solve the above problems, this utility model provides a coal sample container for coal sample gas adsorption experiments, including a container body, an opening at the top of the container body that is sealed to a cover, an inlet pipe, an outlet pipe and a pressure gauge are arranged at intervals on the cover, valves are installed on the inlet pipe and the outlet pipe, and the inlet pipe, the outlet pipe and the pressure gauge are respectively connected to the inside of the container body.

[0008] Preferably, a sealing gasket is provided between the lid and the tank body.

[0009] Preferably, a conical sealing surface is provided on the upper part of the inner wall of the tank;

[0010] A conical ring is fixedly installed on the lower end face of the cover at a position corresponding to the sealing surface. The outer circumference of the conical ring is adapted to the shape of the sealing surface, and the sealing gasket is fixedly installed on the outer circumference of the conical ring.

[0011] Preferably, a connecting groove is provided on the upper part of the outer circumferential surface of the tank. The connecting groove includes a longitudinal groove and a transverse groove that are interconnected. Two connecting grooves are symmetrically arranged with the axis of the tank as the center of symmetry.

[0012] An L-shaped connecting block is fixedly installed on the lower end face of the cover at a position corresponding to the longitudinal groove. The connecting block includes a vertically installed column and a locking block fixedly installed at the bottom of the column. When the cover seals the tank, the locking block moves downward along the longitudinal groove and engages in the transverse groove.

[0013] Preferably, the upper side of the transverse groove includes a horizontally arranged snap-fit ​​surface and an inclined pressing surface, with the pressing surface inclined upward in the direction close to the longitudinal groove.

[0014] Preferably, a protrusion is fixedly provided on the snap-fit ​​surface, and a groove is opened on the upper end surface of the snap-fit ​​block, with the protrusion snapping into the groove.

[0015] Preferably, the tank body and the lid are arranged coaxially.

[0016] Preferably, the sealing gasket is made of nitrile rubber or polytetrafluoroethylene.

[0017] Preferably, two handles are symmetrically arranged on the upper surface of the cover, and the handles are fixedly connected to the cover.

[0018] Preferably, the tank is made of stainless steel.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] The coal sample container for coal sample gas adsorption experiment described in this utility model, after coal is sampled and placed into the container in a timely manner, seals the lid to the container to prevent the loss of adsorbed gas on the coal sample. Before testing the coal sample, gas is introduced into the container through the air inlet pipe to make the pressure inside the container reach the pressure before coal seam mining. Then the coal sample is tested, and the test results are more consistent with the actual situation of coal adsorption of gas in the coal seam.

[0021] The coal sample container for the coal sample gas adsorption experiment described in this utility model, other advantages, objectives and features of this utility model will be partly apparent from the following description, and partly understood by those skilled in the art through research and practice of this utility model. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the coal sample container for the coal sample gas adsorption experiment disclosed in this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the coal sample container used for coal sample gas adsorption experiment disclosed in this utility model.

[0025] Figure 3 This is a cross-sectional structural diagram of the tank body disclosed in this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the cover disclosed in this utility model;

[0027] Figure 5 This is a schematic diagram of the connecting groove disclosed in this utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the connecting block on the cover disclosed in this utility model. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0030] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0031] like Figures 1-6 As shown, a coal sample container for a coal sample gas adsorption experiment includes a container body 1, an opening at the top of the container body 1 that is sealed to a cover body 2, an inlet pipe 3, an outlet pipe 4 and a pressure gauge 5 are spaced apart on the cover body 2, valves are installed on the inlet pipe 3 and the outlet pipe 4, and the inlet pipe 3, the outlet pipe 4 and the pressure gauge 5 are respectively connected to the inside of the container body 1.

[0032] Furthermore, a sealing gasket 6 is provided between the cover 2 and the tank 1.

[0033] Furthermore, a conical sealing surface 7 is provided on the upper part of the inner wall of the tank body 1;

[0034] A conical ring 8 is fixedly installed on the lower end face of the cover 2 at a position corresponding to the sealing surface 7. The outer circumferential surface of the conical ring 8 is adapted to the shape of the sealing surface 7, and the sealing gasket 6 is fixedly installed on the outer circumferential surface of the conical ring 8.

[0035] Furthermore, a connecting groove 9 is provided on the upper part of the outer circumferential surface of the tank body 1. The connecting groove 9 includes a longitudinal groove 10 and a transverse groove 11 that are interconnected. Two connecting grooves 9 are symmetrically arranged with the axis of the tank body 1 as the center of symmetry.

[0036] An L-shaped connecting block is fixedly installed on the lower end face of the cover 2 at a position corresponding to the longitudinal groove 10. The connecting block includes a vertically arranged column 12 and a locking block 13 fixedly arranged at the bottom of the column. When the cover 2 seals the tank 1, the locking block 13 moves downward along the longitudinal groove 10 and locks into the transverse groove 11.

[0037] Furthermore, the upper side of the transverse groove 11 includes a horizontally arranged snap-fit ​​surface 14 and an inclined pressing surface 15, with the pressing surface 15 inclined upward in the direction close to the longitudinal groove 10.

[0038] Furthermore, a protrusion 16 is fixedly provided on the snap-fit ​​surface 14, and a groove 17 is opened on the upper end surface of the snap-fit ​​block 13, with the protrusion 16 snapping into the groove 17.

[0039] Furthermore, the tank body 1 and the cover body 2 are arranged coaxially.

[0040] Furthermore, the sealing gasket 6 is made of nitrile rubber or polytetrafluoroethylene.

[0041] Furthermore, two handles 18 are symmetrically arranged on the upper surface of the cover 2, and the handles 18 are fixedly connected to the cover 2.

[0042] Furthermore, tank 1 is made of stainless steel.

[0043] The working principle of the above technical solution:

[0044] When coal samples taken from underground coal mines are exposed to air, the adsorbed methane gases are released, especially during sample preparation, where the release rate is even higher. This causes a discrepancy between the methane content of the coal sample and the actual underground conditions, affecting the accurate experimental data such as the methane adsorption constant and initial release velocity, and consequently negatively impacting research on coal mine methane disaster prevention and control.

[0045] To ensure the adsorbed methane content in the coal sample more closely reflects the actual methane adsorption situation, after placing the coal sample into container 1, the cover 2 is quickly installed on and sealed to minimize methane loss. At this point, the valves on both the inlet pipe 3 and the outlet pipe 4 are closed. The inlet pipe 3 is connected to a high-pressure methane source. Before the experiment, after sealing the inlet pipe 3 to the high-pressure methane source, the valve on the inlet pipe 3 is opened, and methane gas is introduced into container 1. Once the pressure inside container 1 reaches the pressure of the coal seam where the coal sample is located, the valve on the inlet pipe 3 is closed. The pressure inside container 1 is maintained for a certain period, which can be set according to experimental requirements, allowing the coal sample to adsorb methane within container 1. The time can be set to 24 hours or 48 hours, etc., depending on the experimental requirements. After the adsorption time is reached, the valve on the outlet pipe 4 is opened, and the outlet pipe 4 is connected to a methane desorption instrument to detect various data related to methane adsorption in the coal sample. The data collected include the gas adsorption constant and the initial venting velocity.

[0046] The coal sample container used in the coal sample gas adsorption experiment can also be filled with gas at different pressures to conduct experiments on the adsorption and release of gas in coal samples under different pressures.

[0047] A sealing gasket 6 is provided between the cover 2 and the tank 1. The sealing gasket 6 is used to seal the interface between the tank 1 and the cover 2 to prevent gas leakage from the coal sample. The shape of the sealing gasket 6 is determined according to the shape of the interface between the tank 1 and the cover 2. When the interface between the tank 1 and the cover 2 is a planar connection, the sealing gasket 6 can be set as a ring.

[0048] To improve the sealing of the tank body 1 and the cover 2 and facilitate the positioning of the cover and the tank body 1, a conical sealing surface 7 is provided on the upper part of the inner wall of the tank body 1. A conical ring 8 is fixedly provided on the lower end face of the cover 2 at a position corresponding to the sealing surface 7. The outer circumferential surface of the conical ring 8 is adapted to the shape of the sealing surface 7. A sealing gasket 6 is fixedly provided on the outer circumferential surface of the conical ring 8. The shape of the sealing gasket 6 is adapted to the shape of the outer circumference of the conical ring 8. The sealing gasket 6 can be bonded to the outer circumferential surface of the conical ring 8. When the cover 2 is installed on the tank body 1, the sealing surface 7 contacts the sealing gasket 6 and presses the sealing gasket 6 tightly, thereby improving the sealing performance.

[0049] To reduce the time the coal sample is exposed to air and the loss of gas after release, the cover 2 and the tank 1 should be able to be quickly connected. A connecting groove 9 is opened on the upper part of the outer circumference of the tank 1. The connecting groove 9 includes a longitudinal groove 10 and a transverse groove 11 that are interconnected. Two connecting grooves 9 are symmetrically arranged with the axis of the tank 1 as the center of symmetry. An L-shaped connecting block is fixedly installed on the lower end face of the cover 2 at a position corresponding to the longitudinal groove 10. The connecting block includes a vertically arranged column 12 and a locking block 13 fixedly installed at the bottom of the column 12. When the cover 2 seals the tank 1, the locking block 13 moves downward along the longitudinal groove 10 and locks into the transverse groove 11.

[0050] Two L-shaped connecting blocks are symmetrically arranged on the lower end face of the cover 2, and two locking blocks 13 are arranged opposite each other. One end of the locking block 13 extends towards the direction between the two columns 12. The distance between the columns 12 is greater than or equal to the outer diameter of the tank 1. When installing the cover 2, the locking block 13 is aligned with the longitudinal groove 10 and moves downward. After the locking block 13 moves to the bottom of the longitudinal groove 10, the cover 2 is rotated so that the locking block 13 rotates into the transverse groove 11. The transverse groove 11 locks the locking block 13, so that the cover 2 cannot move upward. The cover 2 and the tank 1 are sealed and connected. The structure is simple and the installation direction is quick, which can reduce the loss of gas released from the coal sample.

[0051] To increase the pressure of the cover 2 on the sealing gasket 6, the upper side of the transverse groove 11 includes a horizontally arranged snap-fit ​​surface 14 and an inclined pressing surface 15. The pressing surface 15 is inclined upward along the direction close to the longitudinal groove 10. During the process of rotating the cover 2 to allow the snap-fit ​​block 13 to enter the transverse groove 11, the upper end face of the snap-fit ​​block 13 contacts the pressing surface 15. Under the action of the inclination angle of the pressing surface 15, the snap-fit ​​block 13 is displaced downward during rotation. The conical ring 8 can further press the sealing gasket 6, thereby improving the sealing performance of the sealing gasket 6.

[0052] When the locking block 13 moves to the position of the locking surface 14, there is a pressing force between the locking surface 14 and the upper end surface of the locking block 13, which can prevent the cover 2 from rotating on its own and prevent the locking block 13 from disengaging from the transverse groove 11. However, in order to improve safety, a protrusion 16 is fixedly provided on the locking surface 14, and a groove 17 is opened on the upper end surface of the locking block 13. The protrusion 16 is engaged in the groove 17, locking the locking block 13, so that the cover 2 cannot rotate, thereby improving the stability of the sealing connection between the cover 2 and the can 1.

[0053] The tank body 1 is made of stainless steel, and the cover 2 can also be made of stainless steel. The connecting block can be made of high molecular polymer material, which can achieve sealing strength. When the cover 2 is rotated, the locking block 13 has a certain elasticity. When the protrusion 16 contacts the upper end face of the locking block 13, the stop block 13 produces a certain elastic deformation, so that the protrusion 16 can cross the edge of the groove 17 and enter the groove 17.

[0054] The tank body 1 is cylindrical, and the lid body 2 is disc-shaped. The tank body 1 and the lid body 2 are coaxially arranged.

[0055] Two handles 18 are symmetrically arranged on the upper surface of the cover 2. The handles 18 are fixedly connected to the cover 2. The handles 18 facilitate the installation of the cover 2 and also facilitate the movement of the coal sample container after sampling.

[0056] The beneficial effects of the above technical solution are as follows:

[0057] The coal sample container for coal sample gas adsorption experiment described in this utility model, after coal is sampled and placed into the container in a timely manner, seals the lid to the container to prevent the loss of adsorbed gas on the coal sample. Before testing the coal sample, gas is introduced into the container through the air inlet pipe to make the pressure inside the container reach the pressure before coal seam mining. Then the coal sample is tested, and the test results are more consistent with the actual situation of coal adsorption of gas in the coal seam.

[0058] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0059] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0060] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A coal sample canister for a coal sample gas adsorption experiment, characterized by, It includes a tank body (1), an opening at the top of the tank body (1) is sealed and connected to a cover body (2), an air inlet pipe (3), an air outlet pipe (4) and a pressure gauge (5) are provided on the cover body (2) at intervals, and valves are provided on the air inlet pipe (3) and the air outlet pipe (4). The air inlet pipe (3), the air outlet pipe (4) and the pressure gauge (5) are respectively connected to the inside of the tank body (1).

2. The coal sample container for the coal sample gas adsorption experiment according to claim 1, characterized in that, A sealing gasket (6) is provided between the cover (2) and the tank (1).

3. The coal sample container for the coal sample gas adsorption experiment according to claim 2, characterized in that, A conical sealing surface (7) is provided on the upper part of the inner wall of the tank (1); A conical ring (8) is fixedly installed on the lower end face of the cover (2) at a position corresponding to the sealing surface (7). The outer circumferential surface of the conical ring (8) is adapted to the shape of the sealing surface (7), and the sealing gasket (6) is fixedly installed on the outer circumferential surface of the conical ring (8).

4. The coal sample container for coal sample gas adsorption experiment according to claim 3, characterized in that, A connecting groove (9) is provided on the upper part of the outer circumferential surface of the tank (1). The connecting groove (9) includes a longitudinal groove (10) and a transverse groove (11) that are connected to each other. Two connecting grooves (9) are symmetrically arranged with the axis of the tank (1) as the center of symmetry. An L-shaped connecting block is fixedly installed on the lower end face of the cover (2) at a position corresponding to the longitudinal groove (10). The connecting block includes a vertically installed column (12) and a locking block (13) fixedly installed at the bottom of the column. When the cover (2) seals the tank (1), the locking block (13) moves downward along the longitudinal groove (10) and locks into the transverse groove (11).

5. The coal sample container for the coal sample gas adsorption experiment according to claim 4, characterized in that, The upper side of the transverse groove (11) includes a horizontally arranged snap-fit ​​surface (14) and an inclined pressing surface (15), with the pressing surface (15) inclined upward in the direction close to the longitudinal groove (10).

6. The coal sample container for the coal sample gas adsorption experiment according to claim 5, characterized in that, A protrusion (16) is fixedly provided on the snap-fit ​​surface (14), and a groove (17) is opened on the upper end surface of the snap-fit ​​block (13), and the protrusion (16) is snapped into the groove (17).

7. The coal sample container for the coal sample gas adsorption experiment according to claim 1, characterized in that, The tank body (1) and the cover body (2) are coaxially arranged.

8. The coal sample container for the coal sample gas adsorption experiment according to claim 2, characterized in that, The sealing gasket (6) is made of nitrile rubber or polytetrafluoroethylene.

9. The coal sample container for the coal sample gas adsorption experiment according to claim 1, characterized in that, Two handles (18) are symmetrically arranged on the upper surface of the cover (2), and the handles (18) are fixedly connected to the cover (2).

10. The coal sample container for the coal sample gas adsorption experiment according to claim 1, characterized in that, The tank body (1) is made of stainless steel.

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