基于吸附热理论的煤&mdash;甲烷高低温等温吸附线预测

岳高伟，王兆丰，康博

doi:10.11764/j.issn.1672-1926.2015.01.0148

天然气地球科学 >

2015 , Vol. 26 >Issue 1: 148 - 153

DOI: https://doi.org/10.11764/j.issn.1672-1926.2015.01.0148

非常规天然气

基于吸附热理论的煤—甲烷高低温等温吸附线预测

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1.河南理工大学土木工程学院，河南焦作 45400;2.河南理工大学安全科学与工程学院，河南焦作 454000

岳高伟（1977-），男，河南临颍人，副教授，博士后，主要从事矿业安全与防治方面的研究. E-mail:mxlygw@163.com.

收稿日期: 2014-04-14

网络出版日期: 2015-01-10

基金资助

国家自然科学基金（编号：51274090）;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金（编号：WS2012B01）;中国博士后科学基金（编号：2013M531673）联合资助.

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Prediction for Isothermal Adsorption Curve of Coal/CH₄ Based on Adsorption Heat Theory

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1.School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,China;
2.School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China

Received date: 2014-04-14

Online published: 2015-01-10

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摘要

以高/低温吸附仿真实验装置为依托，选取无烟煤、贫煤和气肥煤等煤阶的系列煤样，通过对高/低温环境(-30℃、20℃、-10℃、-20℃、30℃)煤的瓦斯吸附实验测试，研究不同温度环境煤对甲烷吸附特征曲线的形态特点，同时，采用吸附热理论对高/低温煤的瓦斯等温吸附线进行了预测，研究结果表明:不同变质程度煤的瓦斯吸附量都随温度降低而增大|不同煤质的等量吸附热与等温吸附量呈良好线性关系|利用等量吸附热预测的不同温度下煤的瓦斯等温吸附量与实验结果吻合，误差小于2%。该方法以已知少量等温吸附实验数据，能够准确预测不同温度和压力下煤的甲烷等温吸附能力，这将极大减少实验工作量，并为研究其他温度和压力条件下煤储层吸附性能提供重要依据。

关键词： 吸附热; 等温吸附线; 高/低温环境; 理论预测

本文引用格式

岳高伟，王兆丰，康博 . 基于吸附热理论的煤—甲烷高低温等温吸附线预测[J]. 天然气地球科学, 2015 , 26(1) : 148 -153 . DOI: 10.11764/j.issn.1672-1926.2015.01.0148

Abstract

Methane adsorption characteristics in coal play an important role in the gas content estimation and gas productivity prediction in coal-bed,but there are differences of methane adsorption isotherms at different temperatures,so many adsorption isotherms need to test at each temperature,which will cause high cost and long time.According to the metamorphic grade of coal,anthracite coal,lean coal and gas-fat coal were chosen as test coal samples.Gas adsorption tests,which relied on high/low temperature adsorption experiment device,were carried out at 30℃,20℃,-10℃,-20℃ and -30℃ to study anatomic features of methane adsorption characteristic curves.And with adsorption heat theory the gas adsorption isotherms of different coal rank were predicted in the high/low temperature environment.The experimental results show that with the decrease of environmental temperature,the gas adsorption capacity of different coal rank all increase.The isosteric adsorption heat of different coal rank has good linear relationships with the isothermal adsorption quantity.The prediction values of gas adsorption quantity with adsorption heat theory agree well with the experimental results,whose error is less than 2%.With little measured data of isothermal adsorption tests,the method of adsorption heat theory can accurately predict the adsorption ability of coal at different temperature and pressure,which will greatly reduce the workload and provide an important basis to study the coal reservoir adsorption properties.

Key words： Adsorption heat; Isothermal adsorption curve; High/low temperature environment; Theoretical prediction

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