低温热转化中煤中镜质体的显微荧光和显微红外特征研究  

Study on fluorescence and Micro-FTIR characteristics of vitrinite in coal during low temperature thermal transformation

作　　者：王越 庞克亮 吴昊天 谷致远 刘福军 赵华 Wang Yue;Pang Keliang;Wu Haotian;Gu Zhiyuan;Liu Fujun;Zhao Hua(Ansteel Beijing Research Institute Co.,Ltd.,Beijing 102211,China;Iron and Steel Research Institute,Angang Iron and Steel Group Corporation,Anshan Liaoning 114009,China)

机构地区：[1]鞍钢集团北京研究院有限公司,北京102211 [2]鞍钢集团钢铁研究院,辽宁鞍山114009

出　　处：《煤化工》2023年第6期92-96,共5页Coal Chemical Industry

摘　　要：为了研究低温热转化过程中煤中镜质体的结构变化与热解反应活性的关系,综合利用显微荧光和显微红外分析技术,研究煤中均质镜质体和基质镜质体在低温热转化(≤400℃)过程中的结构变化及演化规律。结果表明:在蓝光激发下,气煤中均质镜质体不发荧光,基质镜质体呈褐黄色荧光;当热解温度为200℃~280℃时,基质镜质体的荧光色逐渐变为褐红色,400℃时荧光消失。随热解温度升高,基质镜质体的相对荧光强度(I546)急剧减小,最大荧光波长(λmax)呈增大趋势。在低温热转化过程中,均质镜质体和基质镜质体的显微红外光谱变化规律相似,从200℃时开始脂族链长(Kal指数)迅速减小,而芳构化程度(IAr指数)逐渐增大,二者的热转化性能存在差异。In order to study the relationship between the structural changes of vitrinite in coal and the activity of pyrolysis reaction during low temperature thermal transformation,the structural changes and evolution patterns of telocollinite and desmocollinite in coal during low temperature thermal transformation(≤400℃)were studied with fluorescence and micro-FTIR analysis techniques.The results showed that under blue light excitation,telocollinite in gas coal did not fluoresce,while desmocollinite showed brown yellow fluorescence.The fluorescence color of desmocollinite gradually changed to maroon in the temperature range of 200℃-280℃,and disappeared at 400℃.With the increase of pyrolysis temperature,the relative fluorescence intensity(I546)of desmocollinite decreased sharply,and the maximum fluorescence wavelength(λmax)tended to increase.In the process of low temperature thermal transformation,the infrared spectrum change patterns of telocollinite and desmocollinite were similar.The index of Kal decreased rapidly from 200℃,while IAr increased gradually.The thermal transformation property of telocollinite was different from that of desmocollinite.

关 键 词：煤 基质镜质体 均质镜质体 低温热解 显微红外分析 显微荧光特性 脂族链 芳构化 

分 类 号：TQ530[化学工程—煤化学工程]