煤的孔隙分布对其吸附解吸特征的影响

Influence of Pore Distribution of Coal on Adsorption and Desorption Characteristics

为了研究煤的孔隙分布规律对其吸附解吸特征的影响,对干燥煤样进行了压汞实验和等温吸附解吸实验。结果表明,煤的吸附解吸过程具有不可逆性和解吸过程的滞后性,滞后的主要原因是实验煤样孔径为100 nm以下的孔隙比较发育,容易形成毛细凝聚;煤样中孔隙的比表面积主要被过渡孔和微孔所占据,微孔的比表面积占总表面积比例分别为68.82%和72.96%,这决定了煤的吸附能力。

In order to study the influence of pore distribution of coal on adsorption and desorption characteristics,mercury injection experiment and isothermal adsorption desorption experiments of dry coal were done. The results show that the adsorption and desorption process of coal has irreversibility and the desorption process has lagged behind. The main reason for lagged behind is that the pore size of coal less than 100 nm is comparative development, so it is easy to form capillary condensation.Specific surface area of pores in coal sample is mainly occupied by the transition holes and micropore,the specific surface area of micropore accounts for total surface area ratio is 68.82% and 72.96%respectively, which determines the adsorption ability of coal.