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基于黔西—滇东5套镜煤及其有机溶剂二级抽余物的压汞和等温吸附实验结果,对比分析了原煤及其有机溶剂抽余物孔隙结构、吸附性差异及其影响因素。结果表明,抽提作用改变了镜煤孔隙结构,二硫化碳一级抽提煤岩孔结构改造受煤级控制,在煤级第二次跃变之前表现为增孔效应,之后表现为扩孔效应;苯二级抽提总体表现为扩孔效应。抽提作用同样改变了镜煤吸附性,改变方向和幅度取决于煤化程度的高低,在第二次煤化作用跃变之前,有机溶剂抽提作用增强了煤岩吸附性;在第二次煤化作用跃变之后,抽提作用减弱了煤岩吸附性。发现镜煤抽余物的吸附能力变化率与其微孔表面积变化率和孔容变化率存在较好的正相关关系;与总孔、大孔、中孔和过渡孔孔容变化率总体成负相关关系,与其表面积变化率总体也成负相关关系。认为第二次煤化作用跃变对镜煤抽余物孔隙结构和吸附性改变起关键作用;同时佐证了煤岩吸附气体主要通过微孔表面实现。研究还注意到,有机溶剂的抽提作用对煤孔隙结构乃至吸附性的改造可能与煤岩微观层次的大分子结构相关,其机理有待进一步探讨。
Based on the results of mercury intrusion and isothermal adsorption experiments of five sets of secondary coal and organic solvent in Qianxi-East Yunnan, the pore structure, adsorption and differences of raw coal and its organic solvent raffinates were compared and analyzed. The results showed that the extraction effect changed the pore structure of the mirror coal. The carbon disulfide first-order extraction coal-rock pore structure was controlled by the coal grade and showed the pore-increasing effect before the second-grade coal rank transition, The overall performance of the benzene two-stage extraction reaming effect. Extraction also changed the mirror coal adsorption, change direction and magnitude depends on the degree of coalification, before the second coalification transition, organic solvent extraction enhanced coal adsorption; in the second coalification After the jump, the extraction effect weakened the coal adsorption. It was found that there was a positive correlation between the rate of change of adsorption capacity and the change rate of micropore surface area and pore volume, and negatively correlated with the rate of change of pore volume of total pore, macropore, mesopore and transition pore Relationship, and its surface area change rate is also a negative correlation. It is considered that the second coalification transition plays a key role in the change of pore structure and adsorption of the leftover coal through the micropore surface. The study also noted that the extraction of organic solvents on coal pore structure and even the adsorption of alteration may be related to the micro-level macromolecular structure of coal and rock, the mechanism needs further study.