CO2 gasification of Thai coal chars: Kinetics and reactivity studies

被引:0
作者
Supaporn Sawettaporn
Kunchana Bunyakiat
Boonyarach Kitiyanan
机构
[1] Chulalongkorn University,Fuels Research Center, Department of Chemical Technology, Faculty of Science
[2] Chulalongkorn University,Centers of Excellence for Petroleum, Petrochemicals, and Advanced Materials
[3] Chulalongkorn University,The Petroleum and Petrochemical College
来源
Korean Journal of Chemical Engineering | 2009年 / 26卷
关键词
Coal Chars; Reactivity; Kinetics; Gasification;
D O I
暂无
中图分类号
学科分类号
摘要
Two sized fractions (<75 μm and 150–250 μm) of Ban Pu lignite A and Lampang subbituminous B coals were pyrolyzed in a drop tube fixed bed reactor under nitrogen atmosphere at 500–900 °C. Gasification of coal chars with excess carbon dioxide was then performed at 900–1,100 °C. The result was analyzed in terms of reactivity index, reaction rate and activation energy. It was found that chars at lower pyrolysis temperature had highest carbon conversion, and for chars of the same sized fraction and at the same pyrolysis temperature, reactivity indices increased with gasification temperature. The lower rank Ban Pu lignite A had higher Rs values than higher rank Lampang subbituminous B coals. Smaller chars from both coals had higher Rs values, due to the higher ash content. At present, it can be concluded that, within the gasification temperature range studied, gasification rates of chars obtained at various pyrolysis temperatures showed a linear correlation with temperature. However, additional experiment is needed to verify the correlation.
引用
收藏
页码:1009 / 1015
页数:6
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