生物质炭与神木煤CO_(2)气化反应性及动力学研究

Study on CO_(2) gasification reactivity and kinetics of biochar and Shenmu coal

采用热重分析仪研究了生物质炭与神木煤热解特性与CO_(2)气化反应性,通过缩核模型、均相模型和混合模型对生物质炭焦与神木煤焦的动力学特性进行了拟合。结果表明,生物质炭的起始热解温度低于神木煤,热解失重率高于神木煤;在1000~1200℃气化温度下,生物质炭焦与神木煤焦的气化速率随气温温度的升高而升高,同等气化条件下,生物质炭焦的气化速率较神木煤焦更快;通过缩核模型、均相模型和混合模型对气化反应速率变化趋势的拟合,可知生物质炭焦的活化能为60~66 kJ/mol,神木煤焦的活化能为110~128 kJ/mol。

The pyrolysis characteristics and CO_(2)gasification reactivity of biomass char and Shenmu coal were studied by thermogravimetric analyzer.The kinetic characteristics of biomass char and Shenmu coal were fitted by shrinking core model(SCM),homogeneous model(HM)and traditional model(TM).The results show that the initial pyrolysis temperature of biochar is lower than that of Shenmu coal,and the pyrolysis weight loss rate is higher than that of Shenmu coal.Under the gasification temperature of 1000~1200℃,the gasification rate of biochar and Shenmu coal coke increases with the increase of air temperature.Under the same gasification condition,the gasification rate of biochar coke is faster than Shenmu coal coke.The activation energy of biochar coke is 60~66 kJ/mol,and that of Shenmu coal coke is 110~128 kJ/mol respectively by fitting the trend of gasification reaction rate with the shrinking core model,homogeneous model and traditional model.