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Experimental meso scale study on the distribution and evolution of methane adsorption in coal

Dong Zhou，Zeng-chao Feng，Dong Zhao，Yang-sheng Zhao, Ting-ting Cai

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Abstract：To reveal the nature of methane storage in coal under different adsorption pressures, a method combining of SEM-EDS and infrared thermal imaging is used to observe the meso structures and the methane distribution and evolution characteristics in coal. The results indicated that the different meso structures of the coal had different methane adsorption characteristics, leading to the non-uniformity of methane distribution and evolution. In other words, compared with the telocollinite and the cavity pores and meso fractures compactly filled with clay minerals, the cell cavity pores and meso fractures non-compactly filled with clay minerals in the telinite have more inter-gravel pores and broken coal structures in different scales, which can store great amounts of methane due to the larger surface area and more adsorption sites for methane molecules. Therefore, the methane content increases sharply in these meso structures with increasing adsorption pressure, resulting in the centralization of adsorption locations and increasing inhomogeneity of methane storage in different locations of coal. Also, due to the shallower potential wells for methane adsorption, the coverage rate of adsorption sites in these meso structures increases more slowly during the pressure increase, leading to decreased aggregation of methane storage in coal.