科研之友
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摘要
In this study, four types of deformed fat coals with different coal structures were collected in the Pingdingshan mining area and used as the coal samples, and low temperature liquid nitrogen adsorption experiments were carried out on the samples to test the pore diameter distribution of the coal, thereby revealing the distribution regularities of the pore volume and specific surface area in each pore diameter section of the different coal structures. Next, CH4 adsorption-desorption experiments were carried out on the four types of coal samples under the conditions of equilibrium moisture at 30 and 50, to analyze the coupling relationship between the pore structure and CH4 adsorption-desorption characteristics. The results show that the micropore structure of the coal seam is damaged and changed under the effects of the tectonic stress. With the increase in damage, the pore volume of the deformed coal increases, proving that the damage contributes to increasing the pore volume; in addition, the coal samples of the different deformed coals have different adsorption performances, with the fragmented coal having the strongest adsorption performance. Through the study on the pore structure of the deformed coal and CH4 adsorption-desorption characteristics, the paper determines that, in addition to the pore structure, the adsorption-desorption quantity is also influenced by the coupling effect of other factors, such as temperature, moisture and pressure. It is shown that, under the different burial conditions, a certain factor plays the leading role.
- 出版日期2014
- 单位Polytechnic university
