基于低场核磁共振技术的酸化煤样孔隙特征研究

为研究酸化作用后煤体的孔隙结构特征,采用低场核磁共振技术和X射线衍射实验方法,测试了高阶煤自然煤样和酸化煤样的孔隙结构和矿物含量,并根据分形理论对比研究了2种煤样孔隙的分形维数,探讨了酸化作用原理.研究结果表明:自然煤样和酸化煤样中微孔和过渡孔都占较大的比例;煤样酸化后,其孔隙率增大,最小孔径和最大孔径都变大;酸化作用...

Study on pore characteristics of acidified coal samples based on low field nuclear magnetic resonance technology

In order to study the pore structure characteristics of coal after acidification, the pore structure and mineral content of natural and acidified coal samples of high rank coal were measured based on low field nuclear magnetic resonance technology and X-ray diffraction experiment, and according to fractal theory, the fractal dimension of pores of two coal samples was compared and the acidification principle was discussed. The results show that the micropores and transition pores account for a large proportion in both natural and acidified coal samples; after acidification, the porosity of coal sample increases, and the minimum pore size and maximum pore size become larger; acidification can increase the pore volume and increase the uncertainty of pore type; the structure of macropores in two kinds of coal samples has fractal characteristics, and the fractal dimension of macropores increases after acidification; the mineral content of coal sample decreases after acidification, resulting in the change of pore structure.