基于压汞和低温氮吸附联合试验的不同变质程度煤全孔隙结构特征研究
Total Pore Structure Characteristics of Coal with Different Metamorphic Degree Based on Joint Experiment of Mercury Intrusion and Low Temperature Nitrogen Adsorption
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摘要: 为了研究不同变质程度煤全孔隙结构特征,选取6组煤样分别进行煤镜质组反射率R0,max测试、压汞实验和低温氮吸附试验,并联合压汞-低温液氮吸附试验数据进行系统分析。结果表明:2种试验的联用孔径分界点分别为BD01(38.4 nm)、PMBK07(46.8 nm)、HBM03(35.0 nm)、ZZ01(45.8 nm)、SHE02(34.6 nm)、FH03(23.8 nm);随着变质程度的增加,煤样全孔隙总孔体积整体呈现高-低-高的变化趋势,且受煤中可见孔及裂隙的控制作用明显。微孔对全孔隙总孔比表面积贡献最大,且随着变质程度的增加总孔比表面积呈“W”型变化,到无烟煤FH03(Ro,max=3.77%)阶段达到最大值;试验所测煤样的孔隙形态与变质程度关系不明显,孔隙多以开放孔为主且孔隙连通性较好。无烟煤FH03孔隙中较多发育两端开放的平行板状微孔。Abstract: In order to study the characteristics of the whole pore structure of coal with different metamorphic degrees, six groups of coal samples were selected for coal vitrinite reflectance test, mercury intrusion test and low temperature nitrogen adsorption experiment. And we combined with mercury intrusion experiments and low temperature liquid nitrogen adsorption experimental data for systematic analysis. The results showed that: the cut-off points of the two experiments were BD01 （38.4 nm）, PMBK07 （46.8 nm）, HBM03 （35.0 nm）, ZZ01 （45.8 nm）, SHE02 （34.6 nm）, FH03 （23.8 nm）; with the increase of metamorphic degree, the total pore volume of coal sample presents a trend of “high-low-high”, and the control effect of visible holes and macro-pores in coal is obvious; the micro-pore contributes the maximum to the total pore surface area, and the total pore surface area exhibits a type of “W” change trend, reaching the maximum value in the anthracite FH03（Ro,max=3.77%） stage; the relationship between the pore morphology of coal and the degree of metamorphism is not obvious, and the pore of coal sample is mainly open hole and the pore connectivity is better. In the anthracite FH03, there are many parallel plates with open ends in the pores.
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