微尺度氧化铁粉还原过程的动力学模拟  

KINETIC CALCULATION FOR THE REDUCTION PROCESS OF MICRO-SCALE HEMATITE

作　　者：王秀[1] 孙菲[1] 林姜多[1] 李秋菊[1] 洪新[1] 

机构地区：[1]上海大学上海市现代冶金与材料制备重点实验室,上海200072

出　　处：《上海金属》2012年第5期37-41,共5页Shanghai Metals

基　　金：国家自然科学基金资助项目(50634040)

摘　　要：用热重分析法研究中低温条件下,氢气还原不同粒度氧化铁的过程,并提出了多颗粒反应料堆动力学模型,以模拟氧化铁微粉在中低温下的还原过程。该模型包括了化学反应动力学方程和颗粒间的气体扩散方程,采用全隐式有限差分方法对控制方程进行数值求解。通过计算得到不同粒度铁矿粉组成的反应料堆在不同温度下,还原率随时间的变化规律,并根据气体浓度在反应过程中的行为得知化学反应和气体扩散在反应速率控制过程中所起的作用。数值模拟数据与试验结果基本吻合。The reduction process of hematite consist of various particle sizes by hydrogen at low temperature was studied by using the thermogravimetrie analysis method. A kinetic model for gassolid reaction was developed to simulate the behavior of hematite pile reduction at middle and low temperature. The model included the chemical reaction kinetic equation and mass transfers among the particles. The finite difference method with implicit formulation was applied to solve the set of governing equations, from which the variation of reduction ratio of hematite pile with different particle size at different temperatures was obtained. The roles of chemical reaction and inner gas diffusion were also recognized according to the behavior of gas concentration during the reaction process. The numerical simulation data were consistent with the experimental results.

关 键 词：微尺度氧化铁粉 动力学模型 还原率 中低温 气体扩散 

分 类 号：TQ028.32[化学工程]