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中变质煤小分子相对煤的吸附及渗流特性影响

季淮君 ,  李增华 ,  杨永良 ,  刘震 ,  王润

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引用本文: 季淮君, 李增华, 杨永良, 刘震, 王润. 中变质煤小分子相对煤的吸附及渗流特性影响[J]. 燃料化学学报, 2015, 43(3): 281-288. shu
Citation:  JI Huai-jun, LI Zeng-hua, YANG Yong-liang, LIU Zhen, WANG Run. Effect of small organic molecule in mid-metamorphism coal on gas adsorption and flow characteristics[J]. Journal of Fuel Chemistry and Technology, 2015, 43(3): 281-288. shu

中变质煤小分子相对煤的吸附及渗流特性影响

    通讯作者: 季淮君(1988-),男,江苏淮安人,博士,主要从事矿井瓦斯防治研究。Tel:15905210114,E-mail:ji_huaijun@163.com。
  • 基金项目:

    国家重点基础研究发展规划(973计划, 2011CB201200) (973计划, 2011CB201200)

    国家自然科学基金(51304189)。 (51304189)

摘要: 为研究煤中小分子对煤的瓦斯吸附及流动特性的影响,采用四氢呋喃溶剂萃取煤中可溶有机小分子,得到萃取后煤样(残煤)。对原煤和残煤分别进行甲烷等温吸附、解吸实验和径向渗流实验;同时,采用氮气吸附法测试了它们的孔隙结构参数。结果表明,残煤的饱和吸附量a值低于原煤,吸附常数b值增大,萃取小分子降低了煤对甲烷的吸附能力,提高了低压段(<4 MPa)煤对甲烷的解吸速率;原煤的孔体积和平均孔径高于残煤,比表面积和微孔孔体积却减少;萃取后,煤粒表面传质阻力和扩散阻力均减小,残煤甲烷解吸速率和解吸量均高于原煤;同一渗流条件下,残煤的渗透率明显高于原煤。分析认为,煤中部分小分子被溶解后,煤孔隙结构的改变,降低了煤对瓦斯的吸附能力,减小了甲烷在煤粒中的内外扩散阻力,扩大了瓦斯在煤中的流动通道,改变了煤层储运特性,为煤储层的化学增透提供依据。

English

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