燃料化学学报2017，Vol.45Issue(7)：780-788,9.
内在矿物对高灰褐煤CO2气化的影响研究
Influence of inherent minerals on CO2 gasification of a lignite with high ash content
摘要
Abstract
Lignite samples with different ash contents and mineral composition were prepared by dry separation and acid washing. A drop tube reactor and thermogravimetric analyzer were used to study effect of inherent minerals on CO2 gasification reaction of lignite at 1000-1200 ℃. The results show that the inherent minerals have positive effects on gasification, which are temperature sensitive. At lower gasification temperature (1000℃) the inherent minerals can improve carbon conversion indirectly by obstructing the carbon structure order of nascent char. At higher temperatures ( 1100-1200 ℃) the inherent minerals can improve carbon conversion by catalyzing nascent char gasification directly. The alkaline index is not suitable for characterizing role of the inherent minerals of lignite in this case. Ca leads to the difference in catalytic activity of the inherent minerals where the most active form is carboxylate. Various catalytic mechanisms are the root cause of different catalytic activity of Ca in different chemical forms. Ca in the form of carboxylate can reduce the activation energy of coal/char gasification reaction, while CaO only promotes the apparent frequency factor.关键词
褐煤/内在矿物/CO2气化/催化机理/化学形式Key words
lignite/inherent minerals/CO2 gasification/catalytic mechanism/chemical form分类
化学化工引用本文复制引用
李昌伦,王永刚,林雄超,田震,武欣,杨远平,张海永,许德平..内在矿物对高灰褐煤CO2气化的影响研究[J].燃料化学学报,2017,45(7):780-788,9.基金项目
The project was supported by the National Natural Science Foundation of China ( 21406261 ) and the Plan of National Science and Technology Support (2012BAA04B02).国家自然科学基金(21406261)和国家科技支撑计划项目(2012BAA04B02)资助 （ 21406261 ）
