Adsorption-desorption-seepage experimental system of loaded gas-bearing coal under variable temperature conditions

Abstract

The invention discloses an adsorption-desorption-seepage experiment system for loaded coal containing gas under the condition of varying temperatures. The experiment system comprises a tank body used for holding constant-temperature water bath. A triaxial pressure chamber is arranged in the tank body; a coal chamber is arranged in the triaxial pressure chamber; a coal sample is installed in the coal chamber; a foil gauge is adhered onto the coal sample and is connected with a dynamic strain meter; one end of the coal chamber is provided with an opening, and a pressure head is mounted in the opening and connected with a pressure unit; the coal chamber is communicated with a vacuum pipeline and a high pressure gas-transmission pipeline; and a confining pressure pipeline used for conveying hydraulic oil is communicated with a cavity between the coal chamber and the triaxial pressure chamber. The adsorption-desorption-seepage experiment system for loaded coal containing gas under the condition of varying temperatures in the invention has the advantages of a simple structure, convenient operation, reasonable design, high experiment precision and a low price.

Description

technical field [0001] The invention relates to an experimental research technology for the adsorption-desorption-seepage law of loaded gas-containing coal in the coal mining process, and is an adsorption-desorption-seepage experimental system suitable for gas-containing coal under variable temperature conditions. Background technique [0002] In the process of coal mining, there is a very complex interactive relationship between coal and gas. The migration of gas in coal is affected by gas adsorption analysis, gas pressure, in-situ stress state, groundwater, ground temperature, coal structure, etc. Restricted by many factors, there is a strong multi-factor dynamic coupling relationship between coal deformation and gas migration. Coal mine gas accidents, especially coal and gas outbursts, are an external reflection and manifestation of the coupling of these factors under specific conditions. With the continuous increase of coal mining depth in my country, the coal body is i...

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Problems solved by technology

[0004] (1) There is no comprehensive consideration of factors such as temperature control, loading process, adsorption-desorption effect, coal sample deformation, and a relatively complete overall design

[0005] (2) The range of applied loads (including confining pressure, axial pressure, pore pressure, etc.) is small, unable to characterize the load characteristics under deep mining conditions, and cannot meet the scientific research needs of in-depth research on loaded gas-containing coal

[0006] (3) It is difficult to achieve long-term loading, resulting in insufficient stability of the experimental load

[0007] (4) Due to the problem of sealing method and technology, the airtightness of many experimental devices is not good enough, and air leakage and oil leakage often occur, resulting in unstable experimental load conditions, resulting in inaccurate results, and it is difficult to reflect the specific experimental load conditions. True Characteristics of Gassy Coal

[0008] (5) It is difficult to fully ensure that the gas gas flows through the coal sample evenly in the way of surface inflation

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