不同煤种孔隙结构分布及特征研究

Study on Pore Structure Distribution and Characteristics of Different Coal

选取4个不同矿山的煤种制作煤样,通过液氮吸附实验研究煤样孔隙特征,实验测得煤样孔隙比表面积、平均孔径、吸脱附曲线等有关数据。实验结果分析表明:煤样的氮气吸附量与BET比表面积呈正相关,在孔隙结构中,微孔和小孔占煤样孔隙的主要部分,平均孔径越小,10~50 nm的小孔越多,孔容和比表面积两者变化趋势也呈正相关,等温吸附脱附曲线能够判断煤孔隙类型。

Coal samples from four different mines were selected to make coal samples. The pore characteristics of coal samples were studied by liquid nitrogen adsorption experiment. The data of specific surface area, average pore diameter and adsorption-desorption curve of coal samples were measured. The experimental results show that the nitrogen adsorption capacity of coal samples is positively correlated with BET specific surface area, and in the pore structure, micropores and pores account for the main part of the pores of coal samples. The smaller the average pore size is, the more the pores are in the range of 10 to 50 nm. The change trend of pore volume and specific surface area is also positively correlated. The isothermal adsorption desorption curve can judge the pore type of coal.