低温氮吸附法和高压吸附甲烷法研究煤的吸附能力

选取几组不同变质程度的煤样(无烟煤、贫煤、瘦煤、焦煤、肥煤、褐煤),在液氮温度下,通过测试煤样在气体饱和蒸气压力范围内对N2的吸附过程及吸附量,绘制低温氮吸附下的Langmuir吸附曲线综合图;同时,对煤样进行高压等温吸附甲烷试验。结果表明,这几组不同变质程度煤低温氮吸附的能力依次为:无烟煤>肥煤>瘦煤>褐煤>贫煤>焦煤,高压吸附甲烷的能力为:贫煤>无烟煤>褐煤>肥煤>瘦煤>焦煤。经过比较分析,在高压条件下,二者的吸附量是有差别的。

Study on Absorption Capacity of Coal Based on Low-temperature Nitrogen Absorption and High-pressure Adsorption

At the temperature of liquid nitrogen the N2 adsorption process and adsorptive volume of coal samples are measured under the gas saturated vapor pressure.Using BET and BJH theoretical models area of coal are calculated Choosing different rank coals(anthracite 、 meager coal 、 lean coal 、 coking coal 、 rich coal and lignite) as well as isothermal adsorption CH4 experiments of coal in this paper.The results showed that these different ranks of coal of low-temperature N2 absorption capacity of the order: anthracite>rich coal>Lean coal>lignite>lean coal>coking coal,high-pressure absorption capacity of methane: lean coal>anthracite> lignite>rich coal>Lean coal>coking coal.by comparative analysis of the high-pressure conditions,the absorptive capacity of the two kinds of determination is different.