煤自燃特征参数与自由基变化特性研究  

Study on Characteristic Parameters of Coal Spontaneous Combustion and Variation Characteristics of Free Radicals

作　　者：金永飞 李清政[1,2] 刘荫 JIN Yongfei;LI Qingzheng;LIU Yin(College of Safety Science and Engineering,Xi′an University of Science and Technology,Xi′an 710054,China;Key Laboratory of Western Mine and Hazard Prevention,Ministry of Education of China,Xi′an 710054,China)

机构地区：[1]西安科技大学安全科学与工程学院,西安710054 [2]西部矿井开采及灾害防治教育部重点实验室,西安710054

出　　处：《煤炭技术》2022年第7期101-104,共4页Coal Technology

基　　金：国家重点研发计划项目(2018YFC0808201)。

摘　　要：为了研究煤自燃特征参数和自由基与煤变质程度之间的关系,利用热重实验和电子顺磁共振波谱实验研究了4种不同变质程度煤样的质量变化和自由基参数变化规律。结果表明:随着变质程度的增大,煤样的失重曲线向高温区移动,特征温度增大,综合燃烧系数逐渐增大,煤自燃倾向性降低。随着变质程度的增大,煤的自由基浓度逐渐增大,g因子和线宽逐渐降低。进一步分析发现自由基浓度和综合燃烧系数呈正比关系,自由基浓度可作为煤自燃倾向性的判断指标之一。研究结果对煤自燃灾害的防治有积极作用。In order to study the relationship between the characteristic parameters of coal spontaneous combustion and the degree of coal metamorphism,the mass change and free radical parameters of four kinds of coal samples with different degree of metamorphism were studied by thermogravimetry and electron paramagnetic resonance spectroscopy.The results show that:with the increase of the degree of metamorphism,the weight loss curve of coal sample moves to the high temperature zone,the characteristic temperature increases,the comprehensive combustion coefficient gradually increases,and the spontaneous combustion tendency of coal decreases.With the increase of the degree of metamorphism,the concentration of free radicals in coal increases gradually,while the g-factor and line width decrease gradually.Further analysis shows that the free radicals concentration is proportional to the comprehensive combustion coefficient,and the free radicals concentration can be used as one of the indexes to judge the tendency of coal spontaneous combustion.The research results have a positive effect on the prevention and control of coal spontaneous combustion.

关 键 词：热重 自由基 自燃倾向性 综合燃烧系数 

分 类 号：TQ531[化学工程—煤化学工程]