不同煤级煤孔隙分形特征对甲烷吸附特性的影响研究
Journal: Geological and Mineral Surveying and Mapping DOI: 10.12238/gmsm.v8i1.2137
Abstract
针对煤化作用引发的孔隙非均质性对甲烷赋存-运移行为调控机制不清的问题,采用低温液氮吸附实验测定了四种不同煤级煤样的孔隙结构;基于分形理论对孔隙结构进行量化表征,并结合等温吸附实验,研究不同煤级煤孔隙分形特征对甲烷吸附的影响机制。结果表明:微孔对孔容、比表面积的贡献最大,微孔为主要吸附孔,对CH4吸附能力起主导作用,BJG无烟煤对CH4吸附能力最强;随着煤级升高,煤表面粗糙度增大,孔隙结构趋于简单化,非均质性逐渐减弱。分形维数D1与微孔比表面积、Langmuir体积(VL)呈显著正相关,煤孔隙表面粗糙度的增加致使微孔贡献更多比表面积,显著增强了煤对CH4的吸附能力。
Keywords
不同煤级煤;孔隙结构;分形特征;甲烷吸附
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