Modeling the gasification characteristics of char particle under kinetics control
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摘要: 焦炭颗粒气化反应属于典型的非催化气固反应，固体结构会随着反应发生变化，颗粒的气化模型包含了体现固体颗粒表面积变化的结构因子。建立了具体的焦炭颗粒与二氧化碳气化过程的扩散反应模型，并将研究的内容限定在动力学控制区域。该模型的特点在于其反应速率项采用了形式简单的结构因子，模型结果与随机孔模型对比后显示了很好的精确性。利用该模型考察了不同初始孔隙率的焦炭颗粒的转化率变化特性以及固定初始孔隙率下，气化温度和气化剂分压对焦炭颗粒气化的影响。Abstract: Char particle gasification belongs to a classic noncatalytic gas-solid reaction.The soild structure would be changed with reaction, so a structural factor reflecting the surface area evolution of the soild particle was considered in the particle gasification model. The detailed diffusion-reaction model of a char particle gasification with carbon dioxide was developed, which is limited in the kinetics controlling region. A simple structural factor was adopted in the reaction rate term of the model. The modeling results show a good accuracy comparing with that of Random Pore Model. Moreover, the carbon conversion of a particle with a different initial porosity as well as the influence of gasification temperature and reactant partial pressure were investigated.
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Key words:
- char particle /
- gasification model /
- kinetics control /
- carbon dioxide /
- gasification characteristics
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