College of Energy, Xi'an University of Science and Technology

为研究温度、含水量、粒径、变质程度4个因素对煤吸附甲烷特性的影响,应用正交试验设计,采用吸附常数测定仪进行甲烷吸附试验,运用多因素方差分析、多元回归分析方法得到Langmuir吸附常数a、b与各因素的关系及吸附常数a随多因素变化的关系式。试验结果表明:多因素影响下煤样吸附甲烷过程满足Langmuir单分子层吸附理论;各因素对Langmuir吸附常数a、b的大小均有影响,但影响程度存在差异,各因素对吸附常数a的影响程度由大到小依次为变质程度、温度、粒径、含水量,对吸附常数b的影响程度由大到小依次为变质程度、含水量、温度、粒径;吸附常数a与变质程度的变化呈正相关,与温度、含水量、粒径的变化呈负相关,吸附常数b与变质程度的变化呈正相关,与温度变化呈负相关,随粒径、含水量变化呈阶段性变化。通过对煤吸附甲烷多因素影响分析,为进一步研究煤体吸附甲烷特性提供理论基础,同时为井下开采过程中实施防突措施提供了理论指导。

In order to analyse the effect of temperature, water content, particle size and metamorphic grade of coal on methane adsorption, methane adsorption ex periment was conducted with orthogonal experiment design and adsorption constants detector. The relationship between Langmuir adsorption constant a and b and the different factors, and the adsorption constant a varied with four factors were obtained by using multiple factors variance analysis and regression analysis. The results sh owed that coal samples adsorption under the action of multiple factors met Langmuir monolayer adsorption theory. Every single factor would affect Langmuir adsorption constant a and b, but influence extent was different. Metamorphic degree affected constant a was the strongest in the whole factors, followed by the temperature and pa rticle size, and water content was the last. Metamorphic degree affected the adsorption b was the strongest, followed by water content, the temperature and particle siz e was the weakest. Constant a was in positive correlation with metamorphic degree and in negative correlation with temperature, water content and the particle size, bu t constant b was in positive correlation with metamorphic degree, in negative correlation with temperature and changed periodically when particle size and water conten t changing. According the research of the methane adsorption under the action of various factors, the experimental results could provide theoretical basis on further stu dy on adsorption characteristics of coal and theoretical direction for preventing coal and gas outburst in process of mining.

国家自然科学基金科学仪器基础研究专款资助项目(51327007)；国家自然科学基金资助项目(51174157,51104118,51204134)；