Study on the Porous Structure and the Methane Adsorption of Tectonic Coal at Molecular Level
Due to high ratio of tectonic coal in China,carrying out research on the gas occurrence patterns is of great significance in tectonic coal.The molecular scale simulation method was used to investigate the microstructure of coal under mechanical loading and the evolution of methane adsorption performance.The results showed that expansion deformation leads to an increase in coal porosity and specific surface area,while compression deformation is not conducive to both.Further research shows that the methane adsorption within coal is a typical single-molecule layer adsorption.The expansion deformation can bring the enhanced methane adsorption performance of coal.Especially,the changes in the size of closed and open pores in the coal structure have a significant impact on its methane adsorption performance.Current research results provide certain theoretical guidance for understanding the evolution of micro pore structure and the occurrence law of methane gas during the formation of tectonic coal.
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