龙山矿无烟煤超临界状态下吸附甲烷动力学特征  

Adsorption kinetic characteristics of anthracite in Longshan Mine

作　　者：张明杰 杨明鑫[2] 贾天让 刘浩 龚泽[2] ZHANG Mingjie;YANG Mingxin;JIA Tianrang;LIU Hao;GONG Ze(State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Henan Polytechnic University,Jiaozuo 454003,China;School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region,Henan Province,Jiaozuo 454003,China)

机构地区：[1]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,河南焦作454003 [2]河南理工大学安全科学与工程学院,河南焦作454003 [3]中原经济区煤层(页岩)气河南省协同创新中心,河南焦作454003

出　　处：《天然气地球科学》2022年第2期267-276,共10页Natural Gas Geoscience

基　　金：国家科技重大专项(编号:2011ZX05040-005);河南理工大学博士基金(编号:B2017-04);教育部创新团队计划(编号:IRT_16R22)联合资助。

摘　　要：为研究超临界状态下吸附甲烷动力学特征,以河南安阳龙山矿无烟煤为研究对象,利用磁悬浮天平进行了从亚临界到超临界状态煤吸附甲烷的等温吸附实验和吸附动力学实验,基于吸附动力学方程和单孔扩散模型,探讨了无烟煤中甲烷分子扩散、吸附至平衡整个过程中动力学特征。结果表明:实验室测得“峰值”型等温吸附线为过剩吸附曲线,使用截距法校正得到的绝对吸附量符合Langmuir吸附模型;吸附平衡时间与温度、压力均为负相关,随压力增大,吸附平衡时间趋于稳定;Bangham动力学方程最适合描述煤吸附甲烷的动力学过程,吸附速率随压力出现先升高后降低现象,与温度呈正相关;煤中甲烷分子扩散系数随压力表现出3个阶段特征:急剧上升—缓慢上升—急速下降。In order to study the kinetic characteristics of methane adsorption under supercritical state,the anthracite of Anyang Longshan Mine was taken as the research object. The isothermal adsorption experiment and adsorption kinetic experiment were carried out with the magnetic suspension balance high-pressure isothermal adsorption instrument. Based on the commonly used adsorption kinetic equation and unipore diffusion model,the kinetic characteristics of methane in the process of diffusion and adsorption to equilibrium in anthracite were discussed. The results showed that the“peak”isothermal adsorption line measured in the laboratory was the curve of excess adsorption capacity,and the absolute adsorption capacity corrected by intercept method accords with Langmuir adsorption model. The adsorption equilibrium time was negatively correlated with temperature and pressure,and the adsorption equilibrium time tended to be stable with the increase of pressure;Bangham kinetic equation is the most suitable to describe the kinetic process of methane adsorption in coal. The adsorption rate constant first increases and then decreases with pressure,and is positively correlated with temperature;The diffusion coefficient of methane in coal shows three stages with the pressure gauge:a sharp rise-a slow rise-a sharp decline.

关 键 词：重量法 平衡时间 吸附 动力学 扩散 

分 类 号：TE122.2[石油与天然气工程—油气勘探]