补连塔矿煤样的孔隙特征及吸附特性试验研究

为了研究补连塔煤样的孔隙特征和吸附特性,开展了煤样的低温氮吸附试验和等温气体吸附试验。通过分析低温氮吸附试验发现,补连塔煤样的比表面积明显大于变质程度相近其它煤样,且该煤样的孔径分布主要集中在小于10 nm小孔段;分析煤样气体吸附试验结果发现,该煤样的气体吸附量明显低于相同变质程度的其它煤样。分析试验结果表明,补连塔煤样的吸附特性存在明显"比表面积大而气体吸附量小"的特征,这与传统物理吸附存在较大偏差,考虑气体分子热运动,建立小孔气体分子吸附模型解释了发生该种现象原因。

Experimental Study on Pore and Adsorption Characteristics of Coal Samples of Bulianta Mine

In order to study the pore characteristics and adsorption characteristics of the coal samples of Bulianta Mine, the low temperature nitrogen adsorption test and isothermal gas adsorption test of coal samples were carried out. By analyzing the low temperature nitrogen adsorption test, it is found that the specific surface area of the coal sample of Bulianta Mine is obviously larger than that of other coal samples, and the pore size distribution of the coal sample is mainly concentrated in the micro-porous section less than 10 nm. As to the isothermal adsorption test, the results show that the gas adsorption amount of the coal sample is significantly lower than that of other coal samples with the same degree of deterioration. The test results of the coal sample adsorption characteristics show that the adsorption characteristics of the coal sample of Bulianta Mine have obvious characteristics of "large specific surface area but small gas adsorption amount", which is greatly deviated from the traditional physical adsorption theory, considering the thermal motion of gas molecules, establishing micro-pore gas molecular adsorption model explains the reason for this phenomenon.