摘要
吸附热动力学参数是描述吸附过程中物质状态的重要参数。采用高压等温吸附仪对不同变质程度煤样进行了甲烷吸附等温线测定,并结合标准吉布斯自由能变化(ΔG°)、焓变(ΔH°)和熵变(ΔS°),研究了不同温度条件下甲烷在煤体表面的吸附状态。结果表明,甲烷在煤体表面的吸附属于放热的可逆物理过程,温度超过40℃后吸附量下降减缓,吸附过程多是热力学自发的,温度升高会导致吸附量大幅下降,而在高压条件下,压力降低时,煤体中的瓦斯更倾向于解吸成为自由气体状态。
Thermodynamic parameters are important parameters to describe the state of substance in the adsorption process. The methane adsorption isotherms of coal samples with different metamorphic degrees were measured using a high-pressure isothermal adsorption instrument. Combined with the standard Gibbs free energy change （△G° ）, enthalpy change （ △H° ）, and entropy change （△S°）, to study the methane adsorption state on the coal surface under different temperature conditions. The results show that the methane adsorption on the coal surface is a exothermic and reversible physical process. Under the lowtemperature condition, the methane adsorption capacity decreases obviously due to the temperature increase, and the adsorption capacity decreases slowly after the temperature exceeds 40℃. The adsorption process is mostly thermodynamically spontaneous. Under the high temperature and pressure conditions, the gas in the coal surface is more likely to desorb into a free gas state.
作者
张仰强
ZHANG Yang-qiang(Gas Research Institute,CCTEG Chongqing Research Institute,Chongqing 400037,China)
出处
《煤炭工程》
北大核心
2018年第11期95-98,共4页
Coal Engineering
关键词
煤
瓦斯吸附
高低温环境
热动力学
coal
gas adsorption
high and low temperature environment
thermodynamics
