构造煤孔隙结构及甲烷吸附性能分子模拟研究
Study on the Porous Structure and the Methane Adsorption of Tectonic Coal at Molecular Level
杨君文 1赵晓慧 2郑斌1
作者信息
- 1. 西安科技大学材料科学与工程学院,陕西西安 710054
- 2. 西安科技大学图书馆,陕西西安 710054
- 折叠
摘要
构造煤在我国煤炭资源中占比较大,开展构造煤中气体赋存规律研究意义重大.使用分子尺度模拟方法研究煤在机械载荷作用下的微观孔隙结构以及甲烷吸附性能演化规律,结果表明,膨胀变形导致煤体孔隙率和比表面积增大,而压缩变形不利于二者.进一步研究发现,煤体吸附甲烷属于典型的单分子层吸附,膨胀变形会导致煤吸附甲烷性能增强,尤其构造煤内的封闭孔和开放孔尺寸变化对其吸附甲烷性能的影响较大.研究结果对于理解构造煤形成时微观孔隙结构演化以及甲烷气体赋存规律提供一定的理论指导.
Abstract
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.
关键词
煤层气/构造煤/微观结构/分子模拟/甲烷吸附Key words
coalbed methane/tectonic coal/microstructure/molecular simulation/methane adsorption引用本文复制引用
基金项目
陕西省自然科学基金面上项目(2023-JC-YB-371)
出版年
2024
NETL
NSTL
万方数据