Time-varying diffusion characteristics of different gases in coal particles

Long Qingming; Hu Qianting; Cheng Bo

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Time-varying diffusion characteristics of different gases in coal particles

机译：煤颗粒中不同气体的时变扩散特性

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摘要

Based on the analytical solution of gas diffusion in spherical coal particles with a constant diffusion coefficient, a calculation method of time-varying diffusion coefficient is proposed by constructing objective function. The time-varying diffusion behavior of methane, nitrogen and carbon dioxide in the coal particles was studied. The results show that with the increase of diffusion time, the diffusion coefficients of methane, nitrogen and carbon dioxide gas in the coal particles exhibit an attenuation characteristic, eventually approaching a limit value individually. The diffusion coefficient of carbon dioxide is larger than methane, and the diffusion coefficient of nitrogen is smallest. Significant phenomenon of limited diffusion was observed for coal of strong adsorption capability. Through the analysis of the diffusion coefficient of gases at different diffusion time, a mathematical model describing the time-varying diffusion characteristic of gases is obtained. The implementation of mixed gases to replace coal bed methane has a very important practical significance.

机译：基于气体扩散系数恒定的球形煤颗粒中气体扩散的解析解，提出了构造目标函数的时变扩散系数的计算方法。研究了煤颗粒中甲烷，氮和二氧化碳随时间的扩散行为。结果表明，随着扩散时间的增加，煤颗粒中甲烷，氮气和二氧化碳气体的扩散系数呈现衰减特性，最终分别达到极限值。二氧化碳的扩散系数大于甲烷，而氮的扩散系数最小。对于具有强吸附能力的煤，观察到明显的扩散受限现象。通过分析不同扩散时间下气体的扩散系数，得到描述气体随时间变化的扩散特性的数学模型。用混合气体代替煤层气具有非常重要的现实意义。

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《矿业科学技术学报：英文版》 |2017年第006期|P.1025-1029|共5页
作者
Long Qingming; Hu Qianting; Cheng Bo;
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作者单位

[1]College of Resources and Environmental Science, Chongqing University, Chongqing 400030, China;

[2]National Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China;

[3]Chongqing Research Institute, China Coal Research Institute, Chongqing 400037, China;

[1]College of Resources and Environmental Science, Chongqing University, Chongqing 400030, China;

[2]National Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China;

[3]Chongqing Research Institute, China Coal Research Institute, Chongqing 400037, China;

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收录信息中国科学引文数据库(CSCD);
原文格式 PDF
正文语种 CHI
中图分类矿业工程;
关键词
Coal; Coalbed methane (CBM); Adsorption; Diffusion; Objective function;

机译：煤;煤层气（CBM）;吸附;扩散;目标函数;

Time-varying diffusion characteristics of different gases in coal particles

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