煤体吸附CH4及CO2热力学特性试验研究

doi:10.16265/j.cnki.issn1003-3033.2018.06.022

中国安全科学学报 ›› 2018, Vol. 28 ›› Issue (6): 129-134.doi: 10.16265/j.cnki.issn1003-3033.2018.06.022

煤体吸附CH₄及CO₂热力学特性试验研究

林海飞^1,2 教授, 蔚文斌¹, 李树刚^1,2 教授, 严敏^1,2, 白杨^**1

1 西安科技大学安全科学与工程学院,陕西西安 710054;
2 教育部西部矿井开采及灾害防治重点实验室,陕西西安 710054

收稿日期:2018-02-10 修回日期:2018-04-16 出版日期:2018-06-28 发布日期:2020-11-25
通讯作者: **白杨(1993—),女,陕西西安人,博士研究生,主要研究方向为矿井瓦斯防治。E-mail:baiyang9305@163.com。
作者简介:林海飞(1979—),男,山西天镇人,博士,教授,主要从事矿山安全及瓦斯灾害防治方面的研究。E-mail:lhaifei@163.com。
基金资助:
国家自然科学基金重点资助(51734007);国家自然科学基金资助(51674192,51604220)。

Experimental study on thermodynamics characteristics of CH₄ and CO₂ adsorption on coal

LIN Haifei^1,2, WEI Wenbin¹, LI Shugang^1,2, YAN Min^1,2, BAI Yang¹

1 School of Safety Science & Engineering,Xi' an University of Science & Technology,Xi' an Shaanxi 710054,China;
2 Western Mine Exploitation and Hazard Prevention of Ministry of Education,Xi' an Shaanxi 710054,China

Received:2018-02-10 Revised:2018-04-16 Online:2018-06-28 Published:2020-11-25

摘要/Abstract

摘要： 为揭示煤吸附CH₄和CO₂热力学机制,选取新疆硫磺沟的煤样进行不同温度下的CH₄和CO₂等温吸附试验,利用Langmuir、Freundlich、D-R吸附理论模型对等温吸附曲线进行拟合,基于吸附势能理论研究煤样吸附CO₂和CH₄的热力学特性。研究表明:不同温度条件下煤样吸附CH₄和CO₂曲线均符合Langmuir、Freundlich、D-R模型;CH₄和CO₂吸附势能均随着吸附量增大而降低,其等量吸附热和吸附熵变均随着吸附量增加呈上升趋势,并且CO₂的吸附势能、吸附热、吸附熵变均大于CH₄;CH₄和CO₂吸附熵随温度升高总体呈降低趋势,其吸附势能不仅受表面力场影响,也受吸附焓和吸附熵的影响;CO₂等量吸附热受分子间竞争及微孔填充的影响。吸附热力学参数能用来表征煤体吸附特性,可从热力学角度揭示煤体表面竞争吸附的实质。

关键词: 甲烷, 二氧化碳, 吸附势能理论, 等温吸附, 吸附热

Abstract: To reveal the adsorption thermodynamic mechanism of CO₂ and CH₄ on coal,isothermal adsorption experiments at different temperatures were carried out with typical coal samples taken from Xinjiang Liuhuanggou.The Langmuir,Freundlich and D-R adsorption were used to fit the isothermal adsorption curves,based on the theory of adsorption potential energy,coal sample adsorption thermodynamic characteristics of CO₂ and CH₄ were researched.The results indicate that the isothermal adsorption curve under different temperatures of CH₄ and CO₂ adsorption are in line with Langmuir,Freundlich and D-R equation model,that there is a negative correlation between the adsorption potential energy of CH₄ and CO₂ and the adsorption quantity,and there is a positive correlation between both the isosteric heat and entropy change and the adsorption quantity,the adsorption potential energy,isosteric heat,adsorption entropy change CO₂ are all greater than those of CH₄,that with increasing of temperature,the adsorption entropy of CH₄ and CO₂ decreased,that the changes in adsorption potential of CH₄ and CO₂ are not only affected by the surface force but also by the enthalpy of adsorption and adsorption entropy,that the CO₂ isosteric adsorption heat is affected by intermolecular competition and micropore filling,and that the adsorption thermodynamics parameters can be used to characterize the adsorption performance of coal sample,and reveal the nature of coal surface competitive adsorption.

Key words: methane, carbon dioxide, adsorption potential theory, isothermal adsorption, adsorption heat

中图分类号:

X936

林海飞, 蔚文斌, 李树刚, 严敏, 白杨. 煤体吸附CH₄及CO₂热力学特性试验研究[J]. 中国安全科学学报, 2018, 28(6): 129-134.

LIN Haifei, WEI Wenbin, LI Shugang, YAN Min, BAI Yang. Experimental study on thermodynamics characteristics of CH₄ and CO₂ adsorption on coal[J]. China Safety Science Journal, 2018, 28(6): 129-134.

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煤体吸附CH₄及CO₂热力学特性试验研究

Experimental study on thermodynamics characteristics of CH₄ and CO₂ adsorption on coal

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