高低温环境下煤对瓦斯的吸附平衡及热力学研究  

Study on Gas Adsorption Equilibrium and Thermodynamics in High / low Temperature Environment

作　　者：岳基伟 岳高伟[1,2] 谢策[1] 

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454000 [2]河南理工大学土木工程学院,河南焦作454000

出　　处：《矿业安全与环保》2015年第5期10-14,共5页Mining Safety & Environmental Protection

基　　金：国家自然科学基金项目(51274090);河南省科技攻关计划项目(142102310268);中国博士后科学基金项目(2013M531673);河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地开放课题(WS2012B01)

摘　　要：在高低温环境下测定了3种变质程度煤的瓦斯吸附等温线,并通过Sips模型进行拟合,同时对瓦斯吸附的焓变、吸附自由能和熵变等热力学参数进行计算分析,研究结果表明:随环境温度降低,煤表面吸附均一性的γ值线性减小,即吸附不均一性增强;吸附焓变(ΔH)为负值,表明吸附是放热的,且焓变随着温度降低线性减小;不同变质程度煤的焓变—温度线交于温度为0℃(273.15 K)的点;吸附自由能(ΔG)为负值,表明甲烷在煤上的吸附过程为自发过程;随环境温度降低,熵变(ΔS)越大,吸附过程越容易进行,瓦斯吸附量也越大。The gas adsorption isotherms of three kinds of coal with different metamorphic degree were measured in the high and low temperature environment, the measured data were fitted by Sips model, and the thermodynamic parameters of gas adsorption were calculated and analyzed, including the enthalpy change, the adsorption free energy, entropy change and so on. The research results showed the value γ that represents the coal surface adsorption uniformity decreased linearly with the decrease of the ambient temperature, i. e. the adsorption heterogeneity enhanced; the negative enthalpy change (ΔH) of gas adsorption indicated that the adsorption was exothermic, and with the temperature decrease, the enthalpy change reduced linearly;the curves of the enthalpy change and temperature of the coal with different metamorphic degree intersected at the point where the temperature was 0 ℃( 273. 15 K ); the negative value of the adsorption free energy (ΔG ) indicated that the gas adsorption on coal was a spontaneous process;with the decrease of ambient temperature, the greater the entropy change (ΔS) , the easier the gas adsorption and the larger the gas adsorption amount.

关 键 词：高低温环境 瓦斯吸附 吸附热力学 Sips模型 

分 类 号：TD712.1[矿业工程—矿井通风与安全] P618.104[天文地球—矿床学]