中南大学学报（自然科学版）Issue(1)：14-19,6.DOI:10.11817/j.issn.1672-7207.2016.01.003
酸碱脱灰对煤结构及其热解特性的影响
Influence of demineralization on structure and pyrolysis characteristics of coal with acid-alkali method
摘要
Abstract
The ultra-clean coal was prepared by acid-alkali method, the influence of the demineralization on the structure and pyrolysis characteristics of coal were investigated comprehensively based on XRD, Raman spectroscopy, FTIR and TG/DTG tenologies. The results show that good effect of demineralization is achieved by acid-alkali method, and that the ash content of coal samples is reduced to below 0.5%. The molecular structure of the treated coal is destroyed and disordered structure is increased. The contents of hydroxyl and aliphatic functional groups (methyl, methylene) decrease in the ultra-clean coal, the Si—O—Si and Si—O groups disappear, but the number of oxygen functional groups such as phenol and ether increase significantly. Furthermore, demineralization has greater effect on the molecular structure of the coal with lower metamorphic degree. The barrier of mass and heat transfer is reduced by demineralization, thus the initial decomposition temperature (ts) and the maximum mass loss temperature (tmax) move to low temperature area, and the reaction is promoted during pyrolysis.关键词
脱灰/结构/含氧基团/热解特性Key words
demineralization/structure/oxygen functional groups/pyrolysis characteristic分类
能源科技引用本文复制引用
肖劲,李发闯,邓松云,仲奇凡,赖延清,李劼..酸碱脱灰对煤结构及其热解特性的影响[J].中南大学学报（自然科学版）,2016,(1):14-19,6.基金项目
国家自然科学基金资助项目(51374253)(Project(51374253) supported by the National Natural Science Foundation of China) （51374253）
