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OALib Journal期刊
ISSN: 2333-9721
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煤中可溶有机质对煤的孔隙结构及甲烷吸附特性影响
, PP. 385-390
Keywords: 溶剂抽提,可溶有机质,煤的孔隙结构,吸附
Abstract:
？采用四氢呋喃对临涣7煤和祁南3煤进行微波辅助抽提,进行了原煤和残煤等温吸附实验和低温氮气吸附测试,对比分析了抽提前后原煤和残煤的甲烷吸附量和比表面积、孔分布情况,并理论测算煤中可溶有机质吸附溶解甲烷量.结果表明,残煤的甲烷吸附能力低于原煤;抽提后,煤的比表面积和总孔体积增大,平均孔径减少,影响煤吸附气体能力的主要孔径为1.7~5.0nm,且该范围内的孔数有不同程度的增加;压力为0.1~5.0mpa时,两煤样中可溶有机质吸附溶解的甲烷量分别为0.45~4.22ml/g、0.69~4.99ml/g,最大吸附量分别占到原煤最大吸附量的30%和38%.分析认为,煤中可溶有机质占据部分煤中孔隙,影响煤孔隙结构,同时,在压力的作用下,甲烷可以溶解和吸附煤中可溶有机质.
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