Experimental method for raising gas desorption property

Abstract

The invention discloses an experimental method for raising gas desorption property, characterized by based on the experimental study of gas absorption, desorption and permeability by existing non-mechanical method, using an experimental device which comprises a gas bottle, a pressure-tolerant gas pipe, a valve, a gas storage tank, a drying agent, a pressure sensor, a desorption pot, a positive electrode, a constant temperature water tank, a guide wire, a high-voltage variable-frequency power source, a vacuum pump, a data collection card, a computer, a rubber pipe, a measuring tube, and an Erlenmeyer flask, putting an experimental coal sample in the desorption pot, using the high-voltage variable-frequency electric field to change the physicochemical properties of the coal and allow the moisture in the coal and different charged ions dissolved in the water molecules to directionally move, thus free and adsorbed gas is increased, and the desorption property is raised. According to the invention, compared with the gas desorption property obtained by using a natural coal sample, when the high-voltage variable-frequency power source output voltage is 2kV and the frequency is 40Hz, the desorption is averagely raised by 11.42%.

Description

Technical field [0001] The present invention belongs to the field of coal -based stratum gas pumping experimental technology, which involves an experimental method that improves coal gas gas -absorbent under the action of high -voltage inverter electric field. Background technique [0002] There are many high gas and protruding mines in Shanxi. These mineral coal seams have poor penetration, and the permeability coefficients are more than 0.1m. 2 / MPA 2 · D, it is difficult to draw a low -penetration coal seam. [0003] Based on the production, concentration and transportation mechanism of coal seam gas, the undercutrier of low penetration coal seams needs to be considered from two aspects: 1) to promote the relief of the coal seam gas gas, so as to make the gas gas adsorbed on the surface of the coal -based pore cracks.The adsorption state is transformed into a free state and improved the ability of gas gases; 2) expand the migration channel of gas gases, so that the gas gas pen...

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Problems solved by technology

One is mechanical methods, specifically water injection and gas injection displacement, high-pressure hydraulic slotting, blasting fracturing, coal seam roof drainage, mining protection layer, pressure relief mining drainage and drilling drainage, etc. The desorption and permeability of the coal seam are very effective, and the pressure relief is used to deform the low-permeability coal body, relieve the stress barrier, and increase the desorption and permeability of the coal seam gas, thereby playing the role of increasing the permeability of the low-permeability coal seam underground; the other type It is a non-mechanical method, specifically the external electromagnetic field, electric field, temperature field, sound field and electrochemistry, etc. These methods are all laboratory research at this stage, and the external electromagnetic field and electrochemistry are both experimental researches on the adsorption and desorption of coal seam gas. The applied electric field is all experimental research on the permeability of coal seam gas, and there is no related research on the experimental study of gas desorption by external electric field

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