淮北煤田煤中纳米孔隙结构特征分析

Analysis of Nanopore Structure Characteristics in Coal from Huaibei Coalfield

摘要: 为了解淮北煤田煤中纳米孔隙结构特征，本文通过扫描电镜及低温液氮吸附实验，对其孔隙结构特征进行了分析。结果表明：煤的组织孔、角砾孔、张裂隙和剪裂隙均有发育，并含有少量矿物质孔。煤中介孔(2~50 nm)平均比表面积为0.286 m²/g，平均孔容为0.000306 cm³/g。孔径介于2~5 nm以狭窄缝隙形孔为主，同时含有部分两端开口透气孔和少量狭窄墨水瓶形孔；孔径介于5~10 nm主要由长柱状和少量墨水瓶状的孔组成；孔径介于10~50 nm多为平行板状孔。孔隙分形维数D₁介于2.3573~2.8809，分形维数D₂介于2.4708~2.8887，表明其具有复杂的孔隙结构。

Abstract: In order to understand the pore structure characteristics of the coal in Huaibei Coalfield, the pore structure characteristics were analyzed by scanning electron microscopy and low-temperature liquid nitrogen adsorption experiment in this paper. The results show that the tissue holes, breccia holes, tensile cracks and shear cracks are developed and contain a few mineral holes. The average specific surface area of coal intermediate pores (2~50 nm) is 0.286 m²/g, and the average pore volume is 0.000306 cm³/g. The pore size of 2~5 nm is mainly a narrow slit hole, and contains some open-air holes at both ends and a few narrow ink bottle holes. The pore size of 5~10 nm is mainly composed of long columnar pores and a few ink bottle pores. The pore size of 10~50 nm is mostly parallel plates. The fractal dimension D₁ is between 2.3573~2.8809, and the fractal dimension D₂ is between 2.4708~2.8887, indicating that it has a complex pore structure.