煤的粒径对肥煤和气煤孔隙结构的影响

Coal Particle Size Influence on the Pore Structure of Fat Coal and Gas Coal

煤的粒径大小对煤的孔隙结构会产生一定的影响,从而导致煤的瓦斯吸附性能有所变化。基于气煤和肥煤的低温氮吸附实验的基础上,通过分析粒径大小对孔体积、孔比表面积与孔径分布的影响,根据孔体积与孔径分布关系图,找出一定的规律,然后再进一步考察煤的粒径大小对孔隙结构的影响规律,考察结果表明:煤的粒径影响的下限是在0.074～0.2 mm之间的粒径,而影响上限可能是大于3 mm的粒径,并认为粒径较大时会影响孔隙结构真实值的反映。

The size of the coal particle had a certain effect on coal pore structure,which leaded to the change of coal gas adsorption performance.Based on the low-temperature nitrogen adsorption experiment of fat coal and gas coal,through analyzing the influence of the coal particle size on the pore volume,pore surface area and pore size distribution,according to the relationship figure of pore volume and pore size distribution,it found out a certain law,then further studied the law of coal particle size influence on the pore structure,the results showed that：the lower limit of coal particle size impact was between 0.074～0.2 mm in diameter,while the impact upper limit might be greater than 3 mm,and the larger particle size would affect the pore structure to reflect the true value.