In-situ coal body step-by-step pressure control gas diffusion characteristic testing device
A technology of diffusion characteristics and testing device, which is used in measurement devices, analysis of suspensions and porous materials, instruments, etc., can solve the problems of accurate and low gas diffusion characteristics, inability to control the pressure of coal seam gas step by step, etc., and achieve the effect of uniform temperature
Pending Publication Date: 2022-07-01
NORTHEASTERN UNIV
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Problems solved by technology
[0005] Aiming at the deficiencies in the above-mentioned prior art, the present invention provides an in-situ coal body step-by-step pressure control gas diffusion characteristic test device, which solves the problem that the prior art cannot control the pressure of coal seam gas step by step, and the simulated coal The technical problem of low accuracy of gas diffusion characteristics in the process of gas extraction under in situ conditions
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[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. The relationship is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore It should not be construed as a limitation of the present invention.
[0027] In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a featu...
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The invention discloses an in-situ coal body step-by-step pressure control gas diffusion characteristic testing device which comprises a gas path system, a coal body stress loading system, an annular pressure system, a step-by-step pressure control system and a constant temperature system, the coal stress loading system is arranged in the constant temperature system; the gas path system and the annular pressure system are connected with the coal body stress loading system; an automatic back-pressure valve in the step-by-step pressure control system is connected with a gas outlet of the coal body stress loading system, and a pressure setting subsystem is used for setting initial and preset pressure of the automatic back-pressure valve so as to carry out step-by-step pressure control on the coal body. According to the in-situ coal body step-by-step pressure control gas diffusion characteristic testing device provided by the invention, the coal body stress loading system is arranged in the constant temperature system, so that the temperature of the coal body is uniform; the annular pressure system applies pressure to the coal body, so that the requirement of stress rise under the in-situ condition is met; the pressure setting system sets the initial pressure and the preset pressure of the automatic back-pressure valve so as to control the pressure of the coal body step by step, and the characteristics of gas diffusion in the extraction process of coal seam gas under the in-situ condition are accurately simulated.
Description
technical field [0001] The invention relates to the technical field of coal mine disaster monitoring, in particular to an in-situ coal body step-by-step pressure-controlled gas diffusion characteristic testing device. Background technique [0002] Coal shale gas is a gas associated with coal formation or coal metamorphism, and is an important emerging energy source. my country is a large energy storage country for coal shale gas, so it is of great strategic significance for the development, utilization and research of coal shale gas. [0003] At present, coal shale layers in most areas of my country are low-permeability shale layers. Because gas is restricted by many natural conditions in coal-measure shale, the extraction efficiency of coal shale gas is extremely low, and conventional industrial mining cannot be carried out. In the prior art, the thermal mining method is usually used to mine coal shale gas in low-permeability shale layers, and thermal energy injection is u...
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Login to View More IPC IPC(8): G01N15/08G01N13/00
CPCG01N15/082G01N13/00
Inventor 刘正东原琪林晓松程远平李杰赵婷婷陈新辉张正司磊磊
Owner NORTHEASTERN UNIV