煤中不同显微组分孔隙结构特征研究
Study on Pore Sturcture Characteristics of Different Macerals in Coal
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摘要: 为了探讨低阶煤中不同显微组分的孔隙结构特征，选用新疆阜康矿区42号煤层和鄂东斜沟矿8+9号煤层的煤样，通过浮选法进行了2种原煤显微组分的分离，采用低温液氮吸附实验分别对2种原煤及各显微组分富集物进行了比表面积、孔体积、孔径等参数测试，对其等温吸附/脱附回线进行了分析。结果表明：原煤和壳质组符合II类吸附等温线，镜质组和惰质组符合III类等温线。与镜质组和惰质组相比，壳质组具有较高的小孔含量，并且孔体积和比表面积都较大，直径大于5.4 nm的孔中两端开放透气性孔较多，镜质组和惰质组仅含有极少量的两端开放透气性孔；壳质组比表面积和孔体积分形维数最小，镜质组最大。Abstract: In order to study the pore structure characteristics of different macerals in low-rank coal, a floatation experiment was conducted to separate different macerals from raw coal samples which were selected from No.42 coal seam of Xinjiang Fukang Coal Mine and No.8+9 coal seam of Xiegou Coal Mine in the east area of Hubei Province, then the specific surface, pore volume, pore size and other parameters for two kinds of raw coal and different macerals were tested by low termperature liguid nitrogen adsorption experiment, and their adsorption and desorption loops were analyzed. The pore size distribution and pore type characteristics of different macerals were obtained by isothermal adsorption line and desorption loop analysis. The results show that: the coal and chitin group accords with the II type adsorption isotherm, the vitrinite and the inertinite are in accord with the III type isotherm; the chitin has larger small pores content and pore volume and specific surface area than that of the vitrinite and the inertinite. In the chitin group, the open pores have a larger percent in the pores in which the diameters are greater than 5.4 nm, and the vitrinite group and inertinite group contain only a very small percent of open air holes. The specific surface area and pore volume fractal dimension of chitin group were the smallest, and the vitrinite group was the largest.
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Keywords:
- maceral /
- low temperature liquid nitrogen /
- pore structure /
- pore type /
- specific surface area
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