燃料化学学报2017，Vol.45Issue(5)：513-522,10.
不同水蒸气浓度下褐煤气化半焦的活化及机理
Activation and mechanism of chars from partial gasification of lignite at different steam concentrations
摘要
Abstract
The char samples were prepared from the partial gasification of Shengli lignite in a fluidised-bed/fixed-bed reactor,and characterised by BET,Raman,FT-IR,microwave digestion ICP-AES,and TGA.The results indicate that at 800℃ and steam atmosphere the decomposition of ether group is made by the inherent char activation,leading to the decrease in the content of short chain or amorphous carbon between aromatic rings to prevent the graphitizing and the enhancement in the degree of defective aromatic structure.With the increasing of steam concentration (10%-25%) the char reactivity is reduced,which is attributed to the weakening of the regeneration of active sites by forming more ether group via the reaction "Ar,R-CO-Ar,R + 2H2O → Ar,R-O-Ar,R + 2H2 + CO2".However,with the continual increasing of steam concentration (25%-40%) the char reactivity is slightly promoted because the content of defective aromatic structure(3-5 rings)is increased due to the enhancement of the reaction (Ar,R-CH=CH2 + H2O → Ar,R-CO-CH3 + H2) and the reaction (Ar,R-+ H-→ Ar,R-H).关键词
褐煤/流化床/活性位/半焦结构Key words
lignite/fluidized-bed/active site/char structure分类
化学化工引用本文复制引用
申恬,王永刚,程相龙,林雄超..不同水蒸气浓度下褐煤气化半焦的活化及机理[J].燃料化学学报,2017,45(5):513-522,10.基金项目
The project was supported by the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2012BAA04B02).国家科技支撑计划项目(2012BAA04B02)资助 （2012BAA04B02）
