黔西北构造煤与原生结构煤孔隙结构对吸解特性影响实验研究

发布时间：2018-06-14 14:17

  本文选题：构造煤 + 原生结构煤　； 参考：《采矿与安全工程学报》2017年01期

【摘要】：以黔西北青龙煤矿和小屯煤矿的构造煤和原生结构煤为研究对象,利用全自动氮吸附仪分别测得煤样的液氮等温吸解曲线。根据BJH法分别绘制了煤样的孔径分布图,对比了构造煤和原生结构煤孔隙结构对吸解特性的影响。结果表明:构造煤的BET比表面积、孔容均大于原生结构煤,构造煤的孔直径小于原生结构煤;在相同压力条件下,构造煤的解吸量与吸附量之差明显大于原生结构煤;构造煤的解吸量和解吸速度均大于原生结构煤;构造煤和原生结构煤的等温吸附线均具有Ⅱ类等温吸附线的特征;在相对压力约为0.4~0.5时,构造煤与原生结构煤解吸曲线均出现一个较大的拐点;构造煤与原生结构煤吸附与解吸均出现"滞后"现象,且构造煤脱附时很难达到吸附起始点,构造煤比原生结构煤存在更多"墨水瓶"型微孔;构造煤的微孔主要集中在2~3nm左右,原生结构煤的微孔主要集中在4 nm左右;黔西北煤的解吸空间主要集中在大于3~4 nm的微孔孔隙。
[Abstract]:The isothermal absorption and desorption curves of liquid nitrogen of coal samples from Azure Dragon and Xiaotun coal mines in northwest Guizhou Province were measured by using automatic nitrogen adsorption instrument. According to the BJH method, the pore size distribution maps of coal samples were drawn, and the influence of pore structure of tectonic coal and primary structure coal on the absorption characteristics was compared. The results show that the BET specific surface area and pore volume of tectonic coal are larger than that of primary structure coal, and the pore diameter of tectonic coal is smaller than that of primary structure coal, and the difference between desorption capacity and adsorption capacity of tectonic coal is obviously larger than that of primary structure coal under the same pressure. The desorption capacity and desorption rate of tectonic coal are higher than that of primary structure coal, the isothermal adsorption lines of tectonic coal and primary structure coal have the characteristics of class 鈪，

本文编号：2017673