表面活性剂对煤体孔隙结构影响的实验研究
Experimental Study on Effect of Surfactant on Pore Structure of Coal
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摘要: 为研究表面活性剂对煤体孔隙结构的影响，选用不同浓度的十二烷基苯磺酸钠溶液处理煤样，进行低温氮吸附实验。结果表明：表面活性剂处理后的煤样的平均孔径逐渐减小，两者呈负指数关系；表面活性剂处理后的煤样的总比表面积降低，与表面活性剂浓度呈幂函数关系，微孔的比表面积占比减小，中孔与过渡孔的比表面积占比增大；表面活性剂处理后的煤样的总孔体积也降低，两者符合幂函数关系，各孔径下孔体积占比变化不明显；表面活性剂处理后的煤样的分形维数增大，两者符合幂函数关系。Abstract: In order to study the influence of surfactant on the pore structure of coal, the treatment of coal samples with different concentrations of twelve sodium sulfonate solution was carried out. The results show that the average pore size of coal sample treated with surfactant decreases gradually; the total specific surface area of coal samples treated with surfactant decreases, and it has power function relation with surfactant concentration, the specific surface area of the micropore decreases and the specific surface area of middle holes and transition holes increases; the total pore volume of the coal sample treated with surfactant also decreases, and both of them conform to the power function relation, and the pore volume proportion under each pore diameter does not change significantly; the fractal dimension of coal sample after surfactant treatment increases, and the two agree with power function.
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Keywords:
- surfactant /
- nitrogen adsorption /
- pore volume /
- specific surface area /
- fractal dimension /
- pore structure of coal
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