温度对煤吸附性能的影响

为了研究温度对煤体吸附甲烷性能的影响，采用WY-98B型吸附常数测定仪，选取了含气量较高矿井的3种煤样，进行了不同温度下吸附甲烷的等温线测试，并据此拟合出了温度与Langmuir吸附常数a的曲线方程.利用计算煤表面能的方法，推导出了温度与Langmuir吸附常数b的关系.实验及计算结果表明：随着吸附温度的升高，煤体吸附甲烷量变小，压力越大这种变化趋势越大；Langmuir常数a随温度的增大而减小，吸附量越大的煤样，其吸附常数a随温度变化的剧烈程度越大；Langmuir常数b与温度的关系依赖于吸附温度T、吸附平衡时的压强p_t以及煤自身物理性能所决定的常数k；在一定温度范围内，温度对吸附常数的影响可以用具体的函数关系式表示.

The effect of temperature on the adsorbing capability of coal

In order to study the effect of temperature on the methane adsorbing capability of coal, the isotherm tests were done under different temperatures for three methane rich coal samples using the WY-98B adsorption constant determinator. Based on the test data, the relationship between temperature and Langmuir adsorption constant awas established as a curvilinear equation. By means of calculating the coal’s surface energy, the relationship between temperature and Langmuir constant bwas derived. The tests and the calculation show that the adsorption capacity decreases as the adsorption temperature increases, and the larger the pressure is, the stronger such change tendency becomes; the Langmuir constant a decreases as the adsorption temperature increases,and the larger the adsorption capacity of the coal sample is, the more intensely its adsorption constant a changes as the temperature changes; the relationship between Langmuir adsorption constant b and temperature depend on the adsorption temperature T, the adsorption equilibrium pressure, and a constant k related to the physical properties of each sample; and within certain temperature range, the effect of temperature on the adsorption constant can be expressed with an functional relation.