基于拉曼成像的煤岩组分化学结构原位研究

In-situ Chemical Structure Study of Coal Macerals Based on Raman Imaging

采用显微拉曼面扫描技术对三个典型煤种微尺度下二维平面进行了分析,研究了煤岩显微组分原位定量方法及其化学结构。结果表明:采用本研究提出的拉曼光谱参数可实现煤岩显微组分高质量化学成像,耦合聚类分级方法还可实现显微组分原位识别与定量。煤在微尺度下化学结构非均匀性显著,且随煤阶升高而降低。煤中壳质组小芳香环和杂原子官能团数量最多,化学结构最无序,惰质组相反,镜质组居中。显微组分化学结构随煤阶变化差异明显。

Two dimensional planes in micro-scale of three typical coals have been analyzed by micro-Raman mapping technology in order to study in-situ quantitative method and the chemical structure of coal macerals.The results show that the Raman parameters proposed in this study can be used to realize high quality chemical imaging of coal macerals and couple with cluster analysis can also realize in-situ identification and quantification of macerals.The chemical structure heterogeneity of coal is significant in micro-scale and decreases with coal rank.The number of small aromatic rings and heteratomic functional groups in the exinite is the largest,and the chemical structure is the most disordered,incrtinite is in the opposite,vitrinite lies between the two.The chemical structure of macerals varies significantly with coal rank.