EconPapers    
Economics at your fingertips  
 

Evolution characteristics of coal microstructure and its influence on methane adsorption capacity under high temperature pyrolysis

Wei Yang, Yihan Wang, Fazhi Yan, Guangyao Si and Baiquan Lin

Energy, 2022, vol. 254, issue PA

Abstract: The ability of coal to absorb gas is one of the most important factors affecting the prevention and control of mine gas-related disasters and safe exploitation of coal seam gas. In this paper, high gas content coal samples from the Pingdingshan mining area are selected as the research object. The micro molecular structure of coal is altered by pyrolysis, combined with experimental methods such as infrared spectroscopy, isothermal adsorption and liquid nitrogen adsorption. The evolution characteristics of functional groups of coal during high temperature pyrolysis and the variation of gas adsorption capacity of coal after pyrolysis at different temperatures were studied from a micro level. The results show that when the pyrolysis temperature increased from 20 °C to 750 °C, the methane adsorption capacity of coal samples decreased with the increase of pyrolysis temperature. CC, –OH, CO, –CH2 in coal molecules gradually decreased. In terms of the effect of functional groups and the pore structure on methane adsorption, the methane adsorption capacity in descending order is: CC > –OH > CO > –CH2. The results of this study provide theoretical guidance for the development of new technologies for the development of coalbed methane thermal injection mining technology.

Keywords: Langmuir adsorption constant; Coal functional group; Coal seam gas; Pore structure; High temperature pyrolysis (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (11)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544222011653
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:254:y:2022:i:pa:s0360544222011653

DOI: 10.1016/j.energy.2022.124262

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().

 
Page updated 2025-03-19
Handle: RePEc:eee:energy:v:254:y:2022:i:pa:s0360544222011653