胜利褐煤不同显微组分结构及其燃烧反应性能

Microscopic component structure and combustion performance of Shengli lignite

选用内蒙古胜利煤田的褐煤为研究对象,利用光学显微镜分选出惰质组和镜质组两种不同显微组分,通过SEM-EDS、FT-IR、XPS、XRD等表征方式对两种褐煤的结构进行了分析比较,并利用热重分析仪对其热稳定性及燃烧反应性能进行了考察.研究结果表明,惰质组褐煤呈片层结构,表面较平整,而镜质组褐煤呈块状结构,表面空隙较多.惰质组褐煤石墨化程度及稳定性均高于镜质组,且含有较多的碳氧键合结构.惰质组褐煤的起燃温度比镜质组高34℃,而镜质组褐煤在燃烧阶段的活化能低于惰质组,且燃烧前期的失重速率及失重量均高于惰质组.

The lignite from the Shengli coalfield in Inner Mongolia was selected as the research object in this study,and two different microscopic components,inertinite and vitrinite,were sorted out by optical microscope.The lignites of the two different microscopic components were characterized by SEM-EDS,FT-IR,XPS,XRD,their structures were analyzed and compared,and their thermal stability and combustion reaction performances were investigated by thermogravimetric analyzer.The results show that the lignite from the inertinite group has a lamellar structure with a flat surface,while the lignite from the vitrinite group has a massive structure with more surface voids.The degree of graphitization and stability of lignite in the inertinite group are higher than those in the vitrinite group,and it contains more carbon-oxygen bonding structures.The light-off temperature of the inertinite lignite is 34℃higher than that of the vitrinite lignite,while the activation energy of the vitrinite lignite in the combustion stage is lower than that of the inertinite lignite,and the weight loss rate and weight loss in the early stage of combustion are higher than those of the inertinite group.