CN113281234A - Coal dust gas diffusion seepage flow measuring device - Google Patents

Coal dust gas diffusion seepage flow measuring device Download PDF

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Publication number
CN113281234A
CN113281234A CN202110528943.1A CN202110528943A CN113281234A CN 113281234 A CN113281234 A CN 113281234A CN 202110528943 A CN202110528943 A CN 202110528943A CN 113281234 A CN113281234 A CN 113281234A
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tank
transverse
vertical
drilling
gas diffusion
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CN113281234B (en
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任建刚
李冰
翁红波
宋志敏
陈锋
刘见宝
黄克
孙洪伟
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Henan Institute of Engineering
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Henan Institute of Engineering
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N13/04Investigating osmotic effects
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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Abstract

The invention discloses a coal dust gas diffusion seepage determination device, which relates to the technical field of gas diffusion seepage determination and comprises a constant temperature box, a basic tank, a first comparison tank, a second comparison tank, a vacuumizing assembly and a gas supply assembly, wherein the basic tank, the first comparison tank and the second comparison tank are fixedly arranged in the constant temperature box and are respectively connected with a suction end of the vacuumizing assembly and a supply end of the gas supply assembly; the first control tank can simulate the influence of a drilling machine on gas diffusion seepage during direct drilling; the second control tank can simulate the influence of a surrounding drilling machine on gas diffusion seepage during drilling.

Description

Coal dust gas diffusion seepage flow measuring device
Technical Field
The invention relates to the technical field of gas diffusion and seepage determination, in particular to a coal dust gas diffusion and seepage determination device.
Background
In order to reduce the occurrence of gas disaster accidents, the gas content and the gas diffusion seepage situation need to be predicted in advance, so that the strain capacity can be improved by grasping the coal dust gas diffusion seepage rule, and the risk of coal and gas outburst can also be predicted in advance.
Therefore, it is necessary to provide a coal dust gas diffusion and seepage measuring apparatus to solve the above problems in the background art.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a coal bits gas diffusion seepage flow survey device which characterized in that: the device comprises a thermostat, a base tank, a first comparison tank, a second comparison tank, a vacuumizing assembly and a gas supply assembly, wherein the base tank, the first comparison tank and the second comparison tank are fixedly arranged in the thermostat and are respectively connected with a suction end of the vacuumizing assembly and a supply end of the gas supply assembly;
the first control tank can simulate the influence of a drilling machine on gas diffusion seepage during direct drilling;
the second control tank can simulate the influence of a surrounding drilling machine on gas diffusion seepage during drilling.
Further, preferably, the first comparison tank and the second comparison tank both comprise a basic tank, the basic tank comprises a tank body, an upper spiral cover, a lower spiral cover, a bottom plate and a compression plate, wherein the upper end and the lower end of the tank body are respectively connected with the upper spiral cover and the lower spiral cover in a threaded manner;
a bottom plate for bearing coal dust is arranged on the inner side of the lower part of the tank body in a sealing and clamping manner, a guide plate is fixed on the upper screw cap and is in threaded connection with the middle part of the control shaft, polished rods are arranged at two ends of the control shaft, the polished rod at the upper end penetrates through the upper screw cap in a sealing and sliding manner to be connected with the handle, and the polished rod at the lower end is connected with the pressing plate so as to provide initial pressure for the coal dust by controlling the position height of the pressing plate;
and the pressure strip is a grid plate with holes.
Further, as an optimization, the first comparison tank further comprises a vertical drilling head, a vertical drilling machine and a first seal righting plate, wherein the vertical drilling head vertically slides through a bottom plate on the corresponding tank body in a sealing manner, the initial position of the vertical drilling head is flush with the upper surface of the bottom plate, the bottom of the vertical drilling head is coaxially connected with a vertical drilling shaft of the vertical drilling machine, the diameter of the vertical drilling head is the same as that of the vertical drilling shaft, the vertical drilling shaft penetrates through the first seal righting plate in a sealing manner, and the first seal righting plate is located in a lower spiral cover on the corresponding tank body.
Further, as a preferred option, the first comparison tank further comprises a transverse drilling head, a transverse drilling machine and a second seal centralizing plate, wherein the transverse drilling head is sealed and transversely slides to penetrate through the corresponding tank body, the initial position of the transverse drilling head is flush with the inner wall of the tank body, the other end of the transverse drilling head is coaxially connected with a transverse drilling shaft of the transverse drilling machine, the diameter of the transverse drilling head is the same as that of the transverse drilling shaft, the transverse drilling shaft is sealed and slidably penetrates through the second seal centralizing plate, and the second seal centralizing plate is located on the outer side of the corresponding pipe body.
Further, as a preferred option, the second control tank further comprises lateral oscillation springs and a lateral oscillator, wherein one end of each of the lateral oscillation springs is connected to the corresponding side surface of the tank body, the other end of each of the lateral oscillation springs is connected to the output end of the lateral oscillator, and the lateral oscillator is a linear oscillator.
Further, as a preferred option, the second control tank further comprises vertical oscillation springs and a vertical oscillator, wherein one end of each vertical oscillation spring is connected to the bottom surface of the corresponding tank body, the other end of each vertical oscillation spring is connected with the output end of the corresponding vertical oscillator, and the vertical oscillator is a linear oscillator.
Further, as preferred, the vacuum pumping assembly comprises a branch pumping pipe, a main pumping pipe and a vacuum pump, wherein one end of the branch pumping pipe is communicated with the bottom of the basic tank, the communicating position is located above the bottom plate, the other end of the branch pumping pipe is communicated to the main pumping pipe, the main pumping pipe is communicated with the suction end of the vacuum pump, a second pressure gauge is further arranged on the main pumping pipe, and a first valve is further arranged on the branch pumping pipe.
Further, as preferred, the gas supply assembly includes a gas injection branch pipe, a gas injection main pipe and a gas tank, wherein one end of the gas injection branch pipe is communicated with the top of the basic tank, the other end of the gas injection branch pipe is communicated to the gas injection main pipe, the gas injection main pipe is communicated with the gas tank, and the gas injection branch pipe is further provided with a second valve.
Further, as preferred, still be provided with the layering support body in the basic jar, the layering support body is including having the standing groove of upper shed, place coal cinder and layering net in proper order in the standing groove in turn, and the bottom layering net of bottommost is direct to contact with the tank bottom of standing groove, the mesh of layering net is less than the particle diameter of coal cinder, and can make coal cinder in the layering support body has horizontal layering trend, and the through-hole has been seted up in the below and the left side correspondence of the standing groove that is located contrast jar one.
Further, as preferred, still include measuring device, measuring device sets up on basic jar, measuring device includes that diffusion seepage flow pipe, manometer three and flow measurement table, diffusion seepage flow pipe's one end is linked together with the top of basic jar, and the other end is the opening, diffusion seepage flow pipe is last still to have set gradually manometer three, valve three and flow measurement table.
Compared with the prior art, the invention provides a coal dust gas diffusion seepage determination device, which has the following beneficial effects:
in the device, the first control tank can simulate the influence on gas diffusion seepage when a drilling machine directly drills; when the vertical drilling machine drills, the influence of the drilling perpendicular to the trend of the distribution layer on gas diffusion seepage can be simulated, and when the drilling machine drills transversely, the influence of the drilling parallel to the trend of the distribution layer on the gas diffusion seepage can be simulated;
in addition, the second comparison tank can simulate the influence of surrounding drilling machines on gas diffusion seepage during drilling, the second comparison tank can be in the same direction as the first comparison tank, and in addition, the basic tank, the first comparison tank and the second comparison tank can also realize multi-direction comparison measurement, so that the method has better guiding significance for actual operation.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic view showing the internal structure of the incubator of the present invention;
FIG. 3 is a schematic view of the construction of a base tank according to the present invention;
FIG. 4 is a schematic structural diagram of a first control tank according to the present invention;
FIG. 5 is a schematic structural view of a layered frame according to the present invention;
in the figure: 1. a thermostat; 2. a foundation tank; 3. comparing with a first tank; 4. a second comparison tank; 5. air exhaust branch pipes; 6. a main air exhaust pipe; 7. a vacuum pump; 8. gas injection branch pipe; 9. a gas injection manifold; 10. a gas tank; 11. a first pressure gauge; 12. a second pressure gauge; 13. a diffusion seepage pipe; 14. a third pressure gauge; 15. a flow rate measuring meter; 16. a placement groove; 17. layering grids; 21. a tank body; 22. screwing a cover; 23. screwing down the cover; 24. a base plate; 25. a compression plate; 26. a control shaft; 27. a guide plate; 31. a vertical drill bit; 32. a vertical drilling machine; 33. a first seal righting plate; 34. a lateral drilling head; 35. a transverse drilling machine; 36. a second seal righting plate; 41. a lateral oscillation spring; 42. a transverse oscillator; 43. a vertical oscillating spring; 44. a vertical oscillator.
Detailed Description
Referring to fig. 1 to 5, in an embodiment of the present invention, an apparatus for measuring diffusion and seepage of coal dust gas is characterized in that: the device comprises a thermostat 1, a base tank 2, a comparison tank I3, a comparison tank II 4, a vacuumizing assembly and a gas supply assembly, wherein the base tank 2, the comparison tank I3 and the comparison tank II 4 are all fixedly arranged in the thermostat 1 and are respectively connected with a suction end of the vacuumizing assembly and a supply end of the gas supply assembly;
the first comparison tank 3 can simulate the influence of a drilling machine on gas diffusion seepage during direct drilling;
the second control tank 4 can simulate the influence of surrounding drilling machines on gas diffusion seepage during drilling, so that multi-directional control determination is realized, and the method has a good guiding significance for actual operation.
In this embodiment, the first comparison tank 3 and the second comparison tank 4 both include the base tank 2, that is, the first comparison tank 3 and the second comparison tank 4 both have all structures of the base tank 2, and a partial structure is correspondingly added on the basis of the base tank 2, the base tank 2 includes a tank body 21, an upper screw cap 22, a lower screw cap 23, a bottom plate 24 and a pressure plate 25, wherein the upper end and the lower end of the tank body 21 are respectively connected with the upper screw cap 22 and the lower screw cap 23 through threads;
a bottom plate 24 for bearing coal dust is arranged on the inner side of the lower part of the tank body 21 in a sealing and clamping manner, a guide plate 27 is fixed on the upper screw cap 22, the guide plate 27 is in threaded connection with the middle part of a control shaft 26, two ends of the control shaft 26 are provided with polish rods, the polish rod at the upper end penetrates through the upper screw cap 22 in a sealing and sliding manner to be connected with a handle, and the polish rod at the lower end is connected with a pressing plate 25 so as to provide initial pressure for the coal dust by controlling the position height of the pressing plate 25;
and the pressing plate 25 is a mesh plate having a hole, so that the pressing plate 25 does not obstruct the progress of the injection when the gas is injected into the base pot 2 by the gas supply unit.
In this embodiment, as shown in fig. 3, the comparison tank one 3 further includes a vertical drilling head 31, a vertical drilling rig 32 and a first seal righting plate 33, wherein the vertical drilling head 31 is vertically slidably inserted into the bottom plate 24 of the tank 21, and an initial position of the vertical drilling head 31 is flush with an upper surface of the bottom plate 24, a bottom of the vertical drilling head 31 is coaxially connected with a vertical drilling shaft of the vertical drilling rig 32, and a diameter of the vertical drilling head 31 is the same as a diameter of the vertical drilling shaft, the vertical drilling shaft is slidably inserted into the first seal righting plate 33, the first seal righting plate 33 is located in the lower screw cap 23 of the tank 21 corresponding to the first seal righting plate, in practice, the vertical drilling head 31 can be driven by the vertical drilling rig 32 to vertically drill, and a layering frame body is further disposed in the base tank 2, the layering frame body includes a placement groove 16 with an upper opening, place coal cinder and layering net in proper order in the standing groove 16 in turn, and the direct tank bottom with standing groove 16 of the layering net of bottommost contacts, the mesh of layering net is less than the particle diameter of coal cinder, and can make coal cinder in the layering frame has horizontal layering and moves towards, is located the through-hole of having seted up in contrast jar below 16 and the left side correspondence in 3, consequently creeps into the time, can simulate the condition of creeping into of perpendicular to distribution layer trend.
In addition, the first control tank 3 further comprises a transverse drilling head 34, a transverse drilling machine 35 and a second seal righting plate 36, wherein the transverse drilling head 34 is sealed and transversely slides through the corresponding tank body 21, the initial position of the transverse drilling head 34 is flush with the inner wall of the tank body 21, the other end of the transverse drilling head 34 is coaxially connected with a transverse drilling shaft of the transverse drilling machine 35, the diameter of the transverse drilling head 34 is the same as that of the transverse drilling shaft, the transverse drilling shaft is sealed and slides through the second seal righting plate 36, and the second seal righting plate 36 is positioned on the outer side of the corresponding pipe body 21, so that the drilling condition parallel to the distribution layer can be simulated during drilling.
In this embodiment, as shown in fig. 2, the second control tank further includes a lateral oscillation spring 41 and a lateral oscillator 42, wherein one end of each of the lateral oscillation springs 41 is connected to the corresponding side surface of the tank body 21, the other end of each of the lateral oscillation springs is connected to an output end of the lateral oscillator 42, the lateral oscillator 42 is a linear oscillator, it should be explained that each of the lateral oscillation springs corresponds to one of the lateral oscillators 42, and each of the lateral oscillators 42 acts independently and has an adjustable strength, so that the influence on the gas diffusion seepage flow during vertical drilling of the peripheral drilling machine with different lengths and drilling strengths can be simulated.
In addition, the second control tank further comprises vertical oscillation springs 43 and vertical oscillators 44, wherein one ends of the vertical oscillation springs 43 are connected to the bottom surfaces of the corresponding tank bodies 31, the other ends of the vertical oscillation springs are connected with the output ends of the vertical oscillators 44, the vertical oscillators 44 are linear oscillators, it is explained that each vertical oscillation spring corresponds to one vertical oscillator 44, and each vertical oscillator 44 acts independently and has adjustable strength, so that the influence on gas diffusion seepage flow during horizontal drilling of peripheral drilling machines with different lengths and different drilling strengths can be simulated.
It should be noted that, in the comparison experiment, the coal dust with the same particle size and the diffusion seepage data in the known standard state can be placed in the base tank 2, the comparison tank one 3 and the comparison tank two 4, wherein the vertical drill 31 can be driven by the vertical drilling machine 32 to realize the drilling in the vertical direction, so as to simulate the gas diffusion seepage condition in the drilling perpendicular to the distribution layer, and meanwhile, the influence on the gas diffusion seepage in the vertical drilling of the surrounding drilling machines can be simulated by the oscillation of the transverse oscillator, so as to realize the same-direction comparison, and similarly, other experiment comparisons can be performed.
In this embodiment, the vacuum pumping assembly comprises a branch pumping pipe 5, a main pumping pipe 6 and a vacuum pump 7, wherein one end of the branch pumping pipe 5 is communicated with the bottom of the basic tank 2, the communicating position is located above the bottom plate 24, the other end of the branch pumping pipe is communicated with the main pumping pipe 6, the main pumping pipe 6 is communicated with the suction end of the vacuum pump 7, the main pumping pipe 6 is further provided with a second pressure gauge 12, and the branch pumping pipe 5 is further provided with a first valve.
In this embodiment, the gas supply assembly includes a gas injection branch pipe 8, a gas injection main pipe 9 and a gas tank 10, wherein one end of the gas injection branch pipe 8 is communicated with the top of the base tank 2, the other end of the gas injection branch pipe is communicated with the gas injection main pipe 9, the gas injection main pipe 9 is communicated with the gas tank 10, and the gas injection branch pipe 8 is further provided with a second valve.
In this embodiment, still include measuring device, measuring device sets up on basic jar 2, measuring device includes diffusion seepage flow tube 13, three 14 of manometer and flow measurement table 15, diffusion seepage flow tube 13's one end is linked together with basic jar 2's top, and the other end is the opening, diffusion seepage flow tube 13 is last still to be set gradually manometer three 14, three and flow measurement table 15.
During specific implementation, coal dust with the same particle size and diffusion seepage data in a known standard state is placed in the base tank 2, the first comparison tank 3 and the second comparison tank 4, the three tank bodies are vacuumized by the vacuumizing assembly and kept for eight hours, then equal amount of gas with certain pressure is injected into the three tank bodies by the gas supply assembly and kept for eight hours, and then the first comparison tank 3 is used for simulating the influence of a drilling machine on gas diffusion seepage during direct drilling; and (5) simulating the influence of the surrounding drilling machine on the gas diffusion seepage during drilling by using the comparison tank II 4, and finally collecting gas diffusion seepage data by using a measuring device.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.

Claims (10)

1. The utility model provides a coal bits gas diffusion seepage flow survey device which characterized in that: the device comprises a constant temperature box (1), a base tank (2), a first comparison tank (3), a second comparison tank (4), a vacuumizing assembly and a gas supply assembly, wherein the base tank (2), the first comparison tank (3) and the second comparison tank (4) are fixedly arranged in the constant temperature box (1) and are respectively connected with a suction end of the vacuumizing assembly and a supply end of the gas supply assembly;
the first control tank (3) can simulate the influence of a drilling machine on gas diffusion seepage during direct drilling;
the second control tank (4) can simulate the influence of a surrounding drilling machine on gas diffusion seepage during drilling.
2. The coal dust gas diffusion seepage determination apparatus according to claim 1, wherein: the comparison tank I (3) and the comparison tank II (4) both comprise a base tank (2), the base tank (2) comprises a tank body (21), an upper spiral cover (22), a lower spiral cover (23), a bottom plate (24) and a pressing plate (25), wherein the upper end and the lower end of the tank body (21) are respectively connected with the upper spiral cover (22) and the lower spiral cover (23) in a threaded manner;
a bottom plate (24) used for bearing coal dust is hermetically clamped on the inner side of the lower part of the tank body (21), a guide plate (27) is fixed on the upper screw cover (22), the guide plate (27) is in threaded connection with the middle part of a control shaft (26), two ends of the control shaft (26) are polished rods, the polished rods at the upper ends penetrate through the upper screw cover (22) in a sealing and sliding manner to be connected with a handle, and the polished rods at the lower ends are connected with a pressing plate (25) so as to provide initial pressure for the coal dust by controlling the position height of the pressing plate (25);
and the pressing plate (25) is a grid plate with a hole body.
3. The coal dust gas diffusion seepage determination apparatus according to claim 2, wherein: the comparison tank I (3) further comprises a vertical drilling head (31), a vertical drilling machine (32) and a first sealing and righting plate (33), wherein the vertical drilling head (31) penetrates through the bottom plate (24) on the corresponding tank body (21) in a sealing and vertical sliding mode, the initial position of the vertical drilling head (31) is flush with the upper surface of the bottom plate (24), the bottom of the vertical drilling head (31) is coaxially connected with a vertical drilling shaft of the vertical drilling machine (32), the diameter of the vertical drilling head (31) is the same as that of the vertical drilling shaft, the vertical drilling shaft penetrates through the first sealing and righting plate (33) in a sealing and righting mode, and the first sealing and righting plate (33) is located in the lower rotary cover (23) on the corresponding tank body (21).
4. The apparatus according to claim 2 or 3, wherein: the first control tank (3) further comprises a transverse drilling head (34), a transverse drilling machine (35) and a second sealing and righting plate (36), wherein the transverse drilling head (34) penetrates through the corresponding tank body (21) in a sealing and transverse sliding mode, the initial position of the transverse drilling head (34) is flush with the inner wall of the tank body (21), the other end of the transverse drilling head (34) is coaxially connected with a transverse drilling shaft of the transverse drilling machine (35), the diameter of the transverse drilling head (34) is the same as that of the transverse drilling shaft, the transverse drilling shaft penetrates through the second sealing and righting plate (36) in a sealing and sliding mode, and the second sealing and righting plate (36) is located on the outer side of the corresponding pipe body (21).
5. The coal dust gas diffusion seepage determination apparatus according to claim 2, wherein: the second comparison tank further comprises transverse oscillation springs (41) and transverse oscillators (42), wherein one ends of the transverse oscillation springs (41) are connected to the corresponding side faces of the tank body (21), the other ends of the transverse oscillation springs are connected with output ends of the transverse oscillators (42), and the transverse oscillators (42) are linear oscillators.
6. The coal dust gas diffusion seepage determination apparatus according to claim 2 or 5, wherein: the second control tank further comprises vertical oscillation springs (43) and vertical oscillators (44), wherein one ends of the vertical oscillation springs (43) are connected to the bottom surfaces of the corresponding tank bodies (31), the other ends of the vertical oscillation springs are connected with the output ends of the vertical oscillators (44), and the vertical oscillators (44) are linear oscillators.
7. The coal dust gas diffusion seepage determination apparatus according to claim 2, wherein: the vacuumizing assembly comprises a branch air exhaust pipe (5), an air exhaust main pipe (6) and a vacuum pump (7), wherein one end of the branch air exhaust pipe (5) is communicated with the bottom of the basic tank (2), the communicating position is located above the bottom plate (24), the other end of the branch air exhaust pipe is communicated to the air exhaust main pipe (6), the air exhaust main pipe (6) is communicated with the suction end of the vacuum pump (7), a pressure gauge II (12) is further arranged on the air exhaust main pipe (6), and a valve I is further arranged on the branch air exhaust pipe (5).
8. The coal dust gas diffusion seepage determination apparatus according to claim 2, wherein: the gas supply assembly comprises a gas injection branch pipe (8), a gas injection main pipe (9) and a gas tank (10), wherein one end of the gas injection branch pipe (8) is communicated with the top of the basic tank (2), the other end of the gas injection branch pipe is communicated to the gas injection main pipe (9), the gas injection main pipe (9) is communicated with the gas tank (10), and a valve II is further arranged on the gas injection branch pipe (8).
9. The coal dust gas diffusion seepage determination apparatus according to claim 2, wherein: still be provided with the layering support body in basic jar (2), the layering support body is including having upper shed standing groove (16), place coal cinder and layering net in proper order in standing groove (16) in turn, and the bottom of the direct and standing groove (16) of layering net of bottommost, the mesh of layering net is less than the particle diameter of coal cinder, and can make coal cinder in the layering support body has horizontal layering trend, is located the below and the left side correspondence of standing groove (16) in comparison jar (3) and has seted up the through-hole.
10. The coal dust gas diffusion seepage determination apparatus according to claim 1, wherein: still include measuring device, measuring device sets up on basic jar (2), measuring device oozes flow tube (13), manometer three (14) and flow measurement table (15) including the diffusion, the one end of diffusion oozing flow tube (13) is linked together with the top of basic jar (2), and the other end is the opening, diffusion oozes and still has set gradually manometer three (14), valve three and flow measurement table (15) on flow tube (13).
CN202110528943.1A 2021-05-14 2021-05-14 Coal dust gas diffusion seepage flow measuring device Active CN113281234B (en)

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