期刊
APPLIED THERMAL ENGINEERING
卷 112, 期 -, 页码 942-951出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2016.10.164
关键词
Meso structure; Adsorption pressure; Potential wells; Methane distribution; Infrared thermal imaging; SEM
资金
- National Natural Science Foundation of China [21373146, 51304142]
- Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi
- Excellent innovation project of graduate students in Shanxi [20150016]
To reveal the nature of methane storage in coal under different adsorption pressures, a method combining scanning electron microscopy and energy dispersive spectrometry (SEM-EDS) with infrared thermal imaging is used to observe meso structures, methane distribution, and evolution characteristics in coal. The results indicate that the different meso structures of coal have different methane adsorption characteristics, leading to a non-uniformity of the methane distribution and evolution. In other words, compared with the cavity pores and meso fractures in telocollinite, which are compactly filled with clay minerals, the cell cavity pores and meso fractures in telinite, which are non-compactly filled with clay minerals, have more inter-gravel pores and broken coal structures at different scales, and can store great amounts of methane owing to a larger surface area and greater number of adsorption sites for methane molecules. Therefore, the methane content in coal increases sharply in these meso structures with increasing adsorption pressure, resulting in a centralization of the adsorption locations and increasing inhomogeneity of methane storage at different locations. In addition, owing to the shallower potential wells for methane adsorption, the coverage rate of the adsorption sites in these meso structures increases more slowly during an increase in pressure, leading to a decreased aggregation of methane storage in coal. (C) 2016 Elsevier Ltd. All rights reserved.
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