应用Fick定律计算CO/H_(2)+N_(2)混合气体还原铁矿石动力学参数的偏差  

An analysis of deviations arising from calculation of kinetic parameters by applying Fick’s Law in iron ore reduction with CO/H_(2) and N2 gas mixtures

作　　者：孟繁超 邵磊 邹宗树 Meng Fanchao;Shao Lei;Zou Zongshu(School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学冶金学院,沈阳110819

出　　处：《材料与冶金学报》2021年第4期246-250,共5页Journal of Materials and Metallurgy

基　　金：国家自然科学基金资助项目(51574064).

摘　　要：为了讨论采用Fick定律未反应核模型(Fick模型)计算CO/H_(2)+N_(2)混合气体还原铁矿石动力学参数的偏差,建立基于Maxwell-Stefan关系式的未反应核模型(M-S模型),对Fick模型计算得到的动力学参数和M-S模型中设定的动力学参数进行比较分析.结果表明:N_(2)对CO/H_(2)还原FeO的阻碍作用与其摩尔分数成正比;N_(2)对正反应速率常数的计算没有影响;CO-N_(2)体系中Fick模型所用的互扩散系数小于实际值,而H_(2)-N_(2)体系中其所用的互扩散系数大于实际值.In order to discuss the deviation of using Fick’s law based unreacted shrinking-core model(Fick Model)to calculate the kinetic parameters of reduction of iron ore by CO/H_(2)-N_(2),a one-interface unreacted shrinking-core model based on Maxwell-Stefan relations(M-S Model)is built,and the comparison results between the kinetic parameters calculated by Fick Model and those set in M-S Model are analyzed.The results show that,the inhibition of N_(2) on the reduction of FeO by CO/H_(2) is proportional to its mole fraction.N_(2) has no effect on the calculation of forward reaction rate constant.The inter-diffusion coefficient used in Fick Model in CO-N_(2) system is smaller than the actual one,and that in H_(2)-N_(2) system is larger than the actual one.

关 键 词：铁矿石还原 气固反应 互扩散系数 未反应核模型 多组元气体扩散 

分 类 号：TF531[冶金工程—钢铁冶金]