论文部分内容阅读
以山西霍尔辛赫采集的煤样为研究对象,采用有机溶剂(CS_2)、有机酸(CH_3COOH)、无机酸(HCl)、强氧化剂(ClO_2)分别对不同煤体结构煤进行溶剂改造实验,并借助于低温液氮吸附实验,探讨了溶剂改造下构造煤纳米级孔隙的变化规律,认为不同类型的溶剂作用促使不同煤体结构煤中的纳米级孔隙发生差异性变化,这种变化主要因溶剂改造下煤中小分子化合物、表面官能团以及矿物质的变化引起的.研究结果表明:随着煤体破坏程度的增加,各类溶剂的抽提(溶出)率均呈现出增大的趋势,且有机溶剂的抽提率要远大于无机溶剂的溶出率;不同溶剂作用后,煤的BET比表面积和BJH孔容显著增大.其中,有机溶剂作用下破坏程度较大的煤样开放孔数量大于破坏程度较小的煤样,而无机溶剂作用下仅在碎粒煤大孔径阶段开放孔数量明显增加;各类溶剂对煤样均具有一定的扩孔效果,特别是对小孔径段的扩孔效果最为明显.相比而言,有机酸、有机溶剂孔隙改造效果最为显著,无机酸、氧化剂不显著.
Taking coal samples collected from Horsing in Shanxi as the research object, the solvent modification experiment was conducted on coal with different coal structures by using organic solvents (CH 2 CO 3), organic acids (CH 3 COOH), inorganic acids (HCl) and strong oxidants (ClO 2) With the help of low temperature liquid nitrogen adsorption experiments, the variation of nano-scale pores in coal was explored under the modification of solvent. It is considered that the different types of solvents promote the differential changes of nano-scale pores in coal with different coal structures. Solvent-induced modification of small and medium-molecular compounds, surface functional groups and minerals in coal. The results show that the extraction (dissolution) rate of various solvents shows an increasing tendency with the increase of the degree of destruction of coal, The extraction rate of organic solvent is much larger than the dissolution rate of inorganic solvent; the BET specific surface area and BJH pore volume of coal increase significantly with the different solvents, of which the number of open pores of coal sample with larger degree of destruction under organic solvent is larger than Less destruction of coal samples, and only under the action of inorganic solvents, the number of open pores in the coarse-grained coal increased significantly; all kinds of solvents had some reaming effect on coal samples, especially On the contrary, the effect of pore modification of organic acid and organic solvent is the most obvious, and inorganic acid and oxidant are not significant.