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| Study on gas adsorption law of deep coal seam |
| Wang Xiaocong 1,2, Huang Zaijuan 1,2 |
| 1. National Key Laboratory for Green Development of Coking Coal Resources, Pingdingshan 467000, China ; 2. Pingmei Coal Mining and Utilization Research Institute, Pingdingshan 467000, China |
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Abstract Gas adsorption constant is an important part of the basic parameters of coal seam gas. By collecting coal samples from different locations in the deep coal seam of Pingdingshan mining area, the high-pressure isothermal adsorption test was carried out by using WY-98A gas adsorption constant tester. The test results show that the adsorption curve conforms to the langmuir adsorption equation. With the increase of adsorption pressure, the adsorption curve first shows that the adsorption capacity increases sharply, and then the adsorption capacity increases slowly. When the adsorption pressure reaches about 5 MPa, the adsorption curve is gentle and gradually reaches the limit adsorption capacity. In the early stage of the adsorption stage, the amount of adsorbed gas increased rapidly, accounting for more than 70% of the saturated adsorption amount. At the same time, the amount of gas adsorption was closely related to the volatile matter in the coal quality parameters, showing an inverse relationship between the larger the volatile matter and the smaller the adsorption amount.
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