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Apparatus and method for measuring diffusion coefficient of gas in coal briquette based on differential pressure method

A gas diffusion and measurement device technology, applied in the field of measurement, can solve the problems of difficulty in achieving complete sealing, destroying the space structure, unable to represent the gas diffusion coefficient, etc., and achieves the effects of reliable measurement results and improved measurement accuracy.

Active Publication Date: 2017-04-26
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former destroys the unique spatial structure of coal, and the measured results cannot represent the diffusion coefficient of gas in the real coal matrix; for the latter, sealing is the biggest problem, because coal is fragile and cannot withstand high pressure, so It is difficult to achieve a complete seal to prevent gas leakage, and such a small leakage will also have a great impact on the measurement results

Method used

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  • Apparatus and method for measuring diffusion coefficient of gas in coal briquette based on differential pressure method
  • Apparatus and method for measuring diffusion coefficient of gas in coal briquette based on differential pressure method
  • Apparatus and method for measuring diffusion coefficient of gas in coal briquette based on differential pressure method

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preparation example Construction

[0053] Firstly, the coal block 13 to be tested is prepared. First select the coal block 13 to be tested that is complete and does not contain obvious cracks, and process it into the required shape (usually the thickness is less than 5mm, and the cross-sectional area is less than 500mm 2 cuboid) for diffusion experiments. The coal block is observed under a microscope, and if there is a large crack (the crack width is greater than 1 μm), it is discarded, and the coal block 13 to be tested is degassed and dried. Before the test, check the airtightness of the device and evacuate the entire piping system. The processed coal block 13 to be tested is installed on the wire mesh, and placed in the first diffusion chamber 4, the coal block 13 to be tested is suspended, and the diffusion chamber is sealed. The system is evacuated with a vacuum pump 15 so that the whole system does not contain impurities. Use a constant temperature device to keep the temperature in the diffusion chambe...

Embodiment

[0085] According to the above design principles, a diffusion coefficient measurement device was assembled by itself, and the diffusion coefficient test was carried out on coal blocks mined from Pingdingshan Coal Mine. First measure the total volume of the first diffusion chamber 4 with a metering pump as V g = 21.3ml. Select the coal block and process it into thin slices of 24.34×17.13×3.02mm (length×width×height), put them into a drying oven and fully dry them at 70°C for 24 hours. Put the coal block into the first diffusion chamber 4, set the temperature of the water bath to 70°C, vacuumize the entire piping system for 4 hours, lower the water temperature to 30°C, and inject methane gas with a pressure of about 1.2MPa. Diffusion of gas, the air pressure in the first diffusion chamber 4 gradually decreases with time, such as figure 2 As shown, the pressure tends to be stable after about 80 minutes, indicating that the adsorption is saturated and the diffusion is complete. ...

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Abstract

The invention belongs to the field of measurement, and relates to an apparatus and a method for measuring a diffusion coefficient of gas in coal briquette based on a differential pressure method. The apparatus comprises a gas source input terminal, a constant temperature apparatus, a first diffuser chamber, a second diffuser chamber, a differential pressure gauge and a second valve; the gas source input terminal is respectively communicated with the first diffuser chamber and the second diffuser chamber; the differential pressure gauge is arranged between the first diffuser chamber and the second diffuser chamber; the first diffuser chamber is communicated with the second diffuser chamber through the second valve; the to-be-measured coal briquette is suspended in the first diffuser chamber; the first diffuser chamber and the second diffuser chamber are placed in the constant temperature apparatus; and the first diffuser chamber and the second diffuser chamber are in a vacuum state while in use. The invention provides the apparatus and the method for measuring the diffusion coefficient of gas in coal briquette based on the differential pressure method, which have the advantages of high measurement precision, and difficult gas leakage.

Description

technical field [0001] The invention belongs to the field of measurement, and relates to a device and method for measuring the diffusion coefficient of coal bed gas in a coal block to be measured, in particular to a device and method for measuring the diffusion coefficient of gas in a coal block based on a differential pressure method. Background technique [0002] The in-depth understanding of the migration law of coalbed methane in coal reservoirs is very critical for reasonable engineering design and improvement of coalbed methane recovery. At present, the kinetic process of coalbed gas desorption has been clearly understood: the response of gas to pressure gradient must go through three stages: desorption, diffusion and seepage. Due to the special pore and fissure structure of the coal matrix, diffusion plays an important connecting role in it. [0003] Based on the fact that the adsorption-desorption process of coalbed methane is basically reversible, the adsorption ki...

Claims

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Application Information

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IPC IPC(8): G01N13/04
CPCG01N13/04G01N2013/003
Inventor 胡海翔邢彦飞
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI