CaO固硫反应缩芯动力学模型  

KINETIC MECHANICS OF REACTION BETWEEN CaO AND SO_2

作　　者：郭仁宁[1] 赵平卫[1] 黄声和[1] 杨新乐[1] 李向龙[1] 

机构地区：[1]辽宁工程技术大学机械工程学院,辽宁阜新教授123000

出　　处：《煤炭转化》2014年第3期81-85,共5页Coal Conversion

基　　金：国家自然科学基金资助项目(51104083)

摘　　要：建立CaO固硫反应的未反应缩芯动力学模型,通过模型计算,考察了宏观反应、灰层扩散控制、气膜扩散控制和化学扩散控制条件下,反应温度、CaO粒径对固硫反应特性的影响.结果表明,提高反应温度、延长反应时间和减小CaO粒径,有利于提高CaO转化率,其中减小CaO粒径对于提高CaO固硫效果最为明显.模型计算结果与实验结果分析表明,未反应收缩芯模型可较好地描述CaO-SO2固硫反应的宏观动力学,其中影响CaO固硫反应的最主要因素是化学反应扩散控制,提高CaO固硫效率最有效的方法是减小CaO粒径.The un-reacted shrinking core dynamic model of CaO-SO2 solid fluorine reaction was set up.Calculated by the model,under these conditions that macro reaction,gas film diffusion control,ash layer diffusion control,chemistry diffusion control,reaction temperature,CaO particle size and addition of the effects of fluorine-fixing reaction characteristics were studied.CaO conversion increase with the reaction temperature and reaction time increasing.With the decrease of the initial particle size of CaO,CaO concentration rate significantly increased.According to result of experiment and model fitting,unreacted shrinking core model can be used to describe the reaction of CaO-SO2 sulfur retention macro-kinetics.Chemistry diffusion control was the most factor influence sulfur retention,so the best way to improve CaO conversion was to decrease the initial particle size of CaO.

关 键 词：硫 CAO 固硫反应 反应缩芯模型 动力学 

分 类 号：X701.3[环境科学与工程—环境工程] O643[理学—物理化学]