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Gas permeation test device and method for fractured coal rock

A technology for gas permeation testing and crushing coal and rock mass, which is applied in the field of seepage of coal and rock mass, and can solve the problems of restricting the measurement accuracy of axial displacement, affecting the accuracy of gas permeation parameters, and the transmission is not tight

Active Publication Date: 2015-07-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its permeation test device has the following disadvantages: (1) When the temperature is a variable value during the thermal injection mining process of coalbed methane, the device obviously cannot study the influence of temperature on the gas seepage properties of broken coal and rock mass; (2) When mining When the project encounters complex working conditions, it is obvious that the gas pressure does not only come from one direction, and the device cannot study the seepage properties of the broken coal and rock mass under multi-directional gas pressure; (3) Since the cylinder only provides passive constraints, the surrounding The pressure change is completely unknown, which seriously affects the understanding of the permeability characteristics of the broken coal rock medium; (4) The contact between the gland and the cylinder can not achieve good air tightness, which seriously affects the accuracy of the gas permeability parameters; (5) The axial displacement of the gland adopts the axial process of the press. Since the piston of the press transmits force (or displacement) to the gland and then the gland is transmitted to the crushed coal and rock medium, the intightness of transmission between them also restricts the axial displacement. Measurement accuracy of displacement

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  • Gas permeation test device and method for fractured coal rock

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Experimental program
Comparison scheme
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Embodiment 1

[0032] This embodiment provides a gas permeation test device for broken coal and rock mass.

[0033] Such as figure 1 As shown, the device includes a cylinder 6, the top of the cylinder 6 is provided with a gland 5, and the bottom of the cylinder 6 is a base 20;

[0034] The outside of the cylinder 6 is provided with a temperature control chamber 9, the temperature control chamber 9 is composed of a cylinder, and the lower part of the cylinder is connected to the base 20 by bolts,

[0035] The gland 5 is a stepped structure, the center of the gland 5 is provided with a through hole, the push head 1 passes through the through hole, the lower part of the push head 1 is connected with the push plate 4 through the thread 7, the push head 1 and the push plate 4 There is an air outlet 2 connected to the inside of the cylinder, and a displacement sensor 15 is arranged above the push head 1; a pressure sensor 12 is evenly arranged on the inner wall of the cylinder 6, and air holes ar...

Embodiment 2

[0043] To study seepage properties of broken coal and rock mass at different temperatures.

[0044] This embodiment is realized through the following steps:

[0045] 1) Sieve the broken coal body with sand and stones of different particle sizes into broken coal bodies with a particle size of 2.5~5mm;

[0046] 2) Continuously circulate water at 40°C from the water inlet (17) and water outlet (18);

[0047] 3) Open the gland (5), pour the crushed coal with a particle size of 2.5~5mm into the cylinder (6) to make it evenly and naturally accumulate, then close the gland (5), and tighten the screw (14) to realize the cylinder body (6) seal;

[0048] 4) Vacuumize the crushed coal in the cylinder (6) through the vacuum hole (19);

[0049] 5) Continuously inject methane at a pressure of 0.2MPa into the cylinder (6) to saturate the sample;

[0050] 6) Inject 0.2MPa methane gas from the air inlet (11), record the initial flow and pressure of the gas inlet and outlet (2), and control...

Embodiment 3

[0057] The seepage characteristics of broken coal and rock mass under different pressure difference conditions are studied.

[0058] 1) Sieve the broken coal body with sand and gravel sieves of different particle sizes into broken coal bodies with a particle size of 10-12.5mm;

[0059] 2) Open the gland (5), pour the crushed coal with a particle size of 10~12.5mm into the cylinder (6) to make it evenly and naturally accumulate, then close the gland (5), and tighten the screw (14) to realize Cylinder body (6) seal;

[0060] 3) Vacuumize the crushed coal in the cylinder (6) through the vacuum hole (19);

[0061] 4) Continuously inject methane with a pressure of 60kPa into the cylinder (6) to saturate the sample;

[0062] 5) Inject 60kPa methane gas from the air inlet (11), and inject 10kpa methane from the side wall air inlet (8-1) at the same time, and record the initial air inlet and outlet (2), side wall air outlet (8-1) 2) Flow rate and pressure; keep injecting 60kPa meth...

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Abstract

The invention discloses a gas permeation test device and method for fractured coal rock and belongs to the field of seepage of coal rock. The invention provides a device for the gas permeation performance of the fractured coal rock, wherein the device is relatively excellent in air impermeability and precise in axial displacement parameter and confining pressure change can be known through the device. Moreover, through the device, research on the influences of air pressure at different temperatures and in different directions on the seepage property of the fractured coal rock can be realized. The problem in the prior art that the influence of a thermal field on gas permeation is unknown and the gas permeation property of the fractured coal rock under the multi-directional gas pressure difference is unknown is solved. Furthermore, the flow of the seepage field in each layer and the pressure difference change characteristic in a compaction process under the condition that multiple layers of coal rock with different lumpiness grains are combined are fully tested.

Description

technical field [0001] The invention relates to a gas permeation test device and method for broken coal and rock mass, belonging to the field of seepage of coal and rock mass. Background technique [0002] Many gas seepage problems in broken rock mass will be encountered in the mining of coal and natural gas, such as coal seam broken to develop coalbed methane, gas outburst induced by mining, gas drainage in goaf or broken coal rock, nitrogen injection in goaf to extinguish fire, natural gas collection and storage etc. As far as coal mine gas (also known as coalbed methane) is concerned, on the one hand, coal is the main energy source in my country, accounting for about 70% of the primary energy composition, but 44.4% of the state-owned coal mines are high gas and gas outburst mines. On the other hand, coalbed methane is an efficient clean energy and a high-quality chemical raw material. According to estimates, the total amount of coalbed methane resources in my country is...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 冯国瑞李振张钰亭胡胜勇郭育霞刘国艳宋凯歌郭军康立勋
Owner TAIYUAN UNIV OF TECH
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