School of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing , China

为了比较不同条件对瓦斯吸附常数的影响,研究了5种不同煤阶的煤样在7个不同压力点下进行的瓦斯吸附试验,试验分为定容和定压动态2类瓦斯吸附试验,分别获得了定容及定压条件下的吸附平衡点数据,结合Langmuir单分子层理论求出了定容及定压条件下的吸附常数a、b值,并进一步讨论了造成a、b值差异的原因。结果表明:定容和定压2种试验条件对瓦斯饱和吸附量(a值)影响很小,但对瓦斯吸附速率(b值)影响较大,即定压条件下瓦斯吸附速率要大于定容条件下瓦斯吸附速率;进一步得出吸附常数a值随挥发分增大而减小,说明瓦斯饱和吸附量随煤阶的增高而增大。

In order to compare the different condition affected to the gas adsorption constant, the paper had a study on the gas adsorption experiments with five different coal rank samples under seven different pressure points. The experiments could be divided into constant volume and constant pressure dynamic gas adsorption experiments. The data of the adsorption equilibrium points under the conditions of the constant volume and constant pressure were obtained individually and in combined with the Langmuir single molecular layer theory, the adsorption constants a and b under the condition of the constant volume and constant pressure were obtained. A further discussion was conducted on the causes to make the differences of a and b values. The results showed that the two experiment conditions of the constant volume and constant pressure would have certain influences to the gas saturated adsorption volume (constant a), would have high influences to the gas adsorption rate (constant b) and the gas adsorption rate under the condition of the constant pressure would be higher than the gas adsorption rate under the condition of the constant volume. Further the adsorption constant a would be reduced with the volatile matter increased and thus the gas saturated adsorption volume would be increased with the coal rank increased.

国家自然科学基金青年基金资助项目(51604277)；