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Pore Structure Characteristics and Evolution Law of Different-Rank Coal Samples
Geofluids ( IF 1.7 ) Pub Date : 2021-06-17 , DOI: 10.1155/2021/1505306
Zhihui Wen 1, 2, 3 , Qi Wang 1, 2 , Yunpeng Yang 1, 2 , Leilei Si 1, 2, 3
Affiliation  

In this study, the full-size pore structure characteristics of six different-rank coal samples were investigated and analyzed from three perspectives, namely, pore shape, pore volume, and pore specific surface area, by performing a high-pressure mercury injection experiment and a low-temperature nitrogen adsorption experiment. Next, the full-size pore volumes and pore specific surface areas of the six coal samples were accurately characterized through a combination of the two experiments. Furthermore, the relationships between volatile matter content and pore volume and between volatile matter content and pore specific surface area were fitted and analyzed. Finally, the influences of metamorphic degree on pore structure were discussed. The following conclusions were obtained. The pore shapes of different-rank coal samples differ significantly. With the increase of metamorphic degree, the full-size pore volume and pore specific surface area both decrease first and then increase. Among the pores with various sizes, micropores are the largest contributor to the full-size pore volume and pore specific surface area. The fitting curves between volatile matter content and pore volume and between volatile matter content and pore specific surface area can well reflect the influence and control of metamorphic degree on pore volume and pore specific surface area, respectively. With the increase of volatile matter content, the pore volume and the pore specific surface area both vary in a trend resembling a reverse parabola.

中文翻译:

不同煤阶煤样孔隙结构特征及演化规律

本研究通过高压压汞实验,从孔隙形状、孔隙体积和孔隙比表面积三个角度对六种不同等级煤样的全尺寸孔隙结构特征进行了研究和分析。低温氮气吸附实验。接下来,通过两个实验的结合,准确表征了六个煤样的全尺寸孔隙体积和孔隙比表面积。进一步拟合分析了挥发分含量与孔隙体积、挥发分含量与孔隙比表面积的关系。最后讨论了变质程度对孔隙结构的影响。得到以下结论。不同等级煤样的孔隙形状差异显着。随着变质程度的增加,全尺寸孔容和孔比表面积均先减小后增大。在各种尺寸的孔中,微孔是全尺寸孔体积和孔比表面积的最大贡献者。挥发分含量与孔隙体积、挥发分含量与孔隙比表面积的拟合曲线分别可以很好地反映变质程度对孔隙体积和孔隙比表面积的影响和控制。随着挥发分含量的增加,孔容和孔比表面积均呈倒抛物线变化趋势。微孔是全尺寸孔体积和孔比表面积的最大贡献者。挥发分含量与孔隙体积、挥发分含量与孔隙比表面积的拟合曲线分别可以很好地反映变质程度对孔隙体积和孔隙比表面积的影响和控制。随着挥发分含量的增加,孔容和孔比表面积均呈倒抛物线变化趋势。微孔是全尺寸孔体积和孔比表面积的最大贡献者。挥发分含量与孔隙体积、挥发分含量与孔隙比表面积的拟合曲线分别可以很好地反映变质程度对孔隙体积和孔隙比表面积的影响和控制。随着挥发分含量的增加,孔容和孔比表面积均呈倒抛物线变化趋势。
更新日期:2021-06-17
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