The aim of this work was to examine the impact of equilibrium judgment criteria on adsorption test of samples with different adsorption kinetics and determine how long it takes for different particle size samples to attain equilibrium adsorption data. The adsorption data of coal samples with three different particle sizes was obtained by manometric method at the different time intervals. High pressure CH₄ adsorption equilibrium measurements and low pressure N₂ and CO₂ adsorption measurements were carried out for coal samples of eight various particle sizes. The results demonstrated that both the equilibrium and disequilibrium adsorption data satisfied the Langmuir equation. The Langmuir volume (V_L) increased on the equilibrium time increase and it became more remarkable with increasing particle size. The Langmuir pressure (P_L) showed an opposite and more obvious trend. When the particle size of the coal sample decreased from 2 to 4 to <0.074 mm, the adsorption equilibrium time (AET) required for the adsorption isotherm testing declined rapidly from 389 to 5 h. This research is of some enlightening significance for comparing the adsorption characteristics of samples with different adsorption kinetics (adsorbent, temperature, particle size, etc.).

这项工作的目的是检查平衡判断标准对不同吸附动力学样品吸附试验的影响，并确定不同粒径样品达到平衡吸附数据所需的时间。采用测压法在不同时间间隔获得三种不同粒径煤样的吸附数据。对八种不同粒度的煤样品进行了高压CH ₄吸附平衡测量和低压N ₂和CO ₂吸附测量。结果表明平衡和不平衡吸附数据均满足Langmuir方程。朗缪尔体积 ( V _L) 随着平衡时间的增加而增加，并且随着粒径的增加变得更加显着。朗缪尔压力（P_大号）显示相反的趋势越来越明显。当煤样的粒径从 2 到 4 减小到 <0.074 mm 时，吸附等温线测试所需的吸附平衡时间 (AET) 从 389 小时迅速下降到 5 小时。该研究对于比较不同吸附动力学（吸附剂、温度、粒径等）样品的吸附特性具有一定的启发意义。