荷载对重塑煤体吸附特性的影响

碎软煤的完整原样制取困难，需要加工制成重塑煤体，为了研究不同压制荷载对煤体物性特征的影响，以重塑煤体为研究对象，基于低温液氮的孔隙测试实验和高压容量法的甲烷吸附实验，探讨不同成型荷载而成的重塑煤体的微小孔结构及其吸附特性的差异。结果表明:不同成型荷载压制而成的重塑煤体，其微孔和小孔的孔容随着成型荷载的增大而略微减少，孔比表面积随着成型荷载的增大而略微增加，总孔体积减少和孔比表面积增加的幅度不大；通过分形理论发现无论高压段还是低压段，孔隙结构具有明显的分形特征，且在高压段的分形维数普遍低于低压段，不同荷载压制而成的重塑煤体的分形维数差别不大；等温吸附线均符合第Ⅰ类等温吸附曲线，Langmuir模型适用于描述重塑煤体的等温吸附，成型荷载对煤的吸附常数有一定的影响，其对吸附常数b值的影响大于对a值的影响。研究不同成型荷载下重塑煤体的吸附特性，为不同条件下型煤制作及冷冻取心实验提供参考。 

Effect of load on adsorption characteristics of remolded coal

In view of the difficulty in preparing the coal with broken soft structure intact, it needs to be processed into remolded coal. In order to study the influence of suppression loads on the physical characteristics of coal, the micro-pore structure and adsorption characteristics of remolded coal under different molding loads were discussed based on the pore test experiment of low temperature liquid nitrogen and the methane adsorption experiment of high pressure capacity method. The results show that: The pore volume of micropores and pores decreases slightly with the increase of molding load, the specific surface area increases slightly with the increase of molding load, and the reduction of total pore volume and the increase of pore specific surface area are not obvious. According to the fractal theory, it is found that the pore structure has obvious fractal characteristics, and the fractal dimension in the high pressure section is generally lower than that in the low pressure section, and the fractal dimension of remolded coal formed by different loads has little difference. The adsorption isotherm curves conform to the first type adsorption curve, and Langmuir model is applicable to describe the reshape coal isothermal adsorption remolded coal. The molding load has a certain influence on the adsorption constant of coal. Its influence on adsorption constant b value is greater than that on a value. The study of the adsorption characteristics of remolded coal under different molding loads is of great engineering significance for gas extraction and treatment.