淮北煤田临涣矿区煤的孔隙结构分析

Pore Structure Analysis of Coals in Linhuan Mining Area of the Huaibei Coalfield

摘要: 为分析淮北煤田临涣矿区煤样的孔隙结构，以淮北煤田临涣矿区煤为研究对象，结合低温N₂吸附实验和数理统计方法，分析了煤的孔隙结构及分形特征，讨论了孔隙结构参数与分形维数的关系。结果表明：煤的低温N₂等温曲线与IUPAC分类的Ⅳ型接近，回滞环近似H3和H4型，主要为平板状和狭缝型孔隙。煤的孔容介于0.06~0.45 cm³/100g (平均值：0.15 cm³/100 g)，比表面积介于0.19~2.25 m²/g (平均值：0.68 m²/g)。分形维数D₁介于2.328~2.7122 (平均值：2.534)，分形维数D₂介于2.432~2.5933 (平均值：2.531)，反映了孔隙结构的非均质性程度较高。由分形维数和孔容和比表面积的关系知：煤样分形维数D₁与孔容与比表面积之间没有关系；分形维数D₂与孔容和比表面积均存在弱正相关关系。

Abstract: In order to analyze the pore structure of coal samples in Linhuan mining area of Huaibei coal field. taking the coals in Linhuan Mining Area of the Huaibei Coalfield as the research objects, combined with the low temperature N₂ adsorption experiment and mathematical statistics, the pore structure and fractal characteristics of coals were analyzed, and the relationship between pore structure parameters and fractal dimension was discussed. Result shows that the isothermal curve is close to the type IV of IUPAC classification, and the adsorption hysteresis loop is similar to H3 and H4, which are flat and slit pores. The pore volume of coal in the Linhuan Mining Area is 0.06~0.45 cm³/100 g (Avg value: 0.15 cm³/100g), and the specific surface area is 0.19~2.25 m²/g (Avg value: 0.68 m²/g). The fractal dimension D₁ is 2.328~2.7122 (Avg value: 2.534), and the fractal dimension D₂ is 2.432~2.5933 (Avg value: 2.531), which reflects the high degree of heterogeneity of pore structure. There is no relationship between the fractal dimension D₁ of coal samples and the pore volume and specific surface area. There is a weak positive correlation between fractal dimension D₂ and pore volume and specific surface area.