转底炉内冶金粉尘还原过程数值模拟  

Numerical simulation of metallurgical dust reduction process in rotary hearth furnace

作　　者：郑占一 齐凤升 刘中秋 李宝宽 Zheng Zhanyi;Qi Fengsheng;Liu Zhongqiu;Li Baokuan(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2期85-91,96,共8页Journal of Materials and Metallurgy

基　　金：国家重点研发计划项目(2017YFB0304000)。

摘　　要：基于计算流体力学方法并以收缩核模型为基础建立了转底炉内燃烧、烟气流动、气体与冶金粉尘球团传热传质及冶金粉尘球团化学反应的全耦合数学模型,计算了中径36 m的转底炉内流场、温度场及冶金粉尘球团内铁氧化物的还原反应,重点分析了球团内部各种铁氧化物浓度及球团的金属化率.采用文献中球团在高温硅钼炉内进行的还原实验验证了模型的可靠性.结果表明,在本文工况下,经过一个工作周期(25 min),炉膛内烟气流速随流动方向逐渐增大,转底炉中径处球团温度为1416.7 K,铁的浓度由3477.50 mol/m^(3)增长至9719.94 mol/m^(3),冶金粉尘球团的金属化率最高可达90.85%,平均金属化率为81.42%.A fully coupled mathematical model of combustion,gas flow,heat and mass transfer,chemical reaction in metallurgical dust pellets was established based on computational fluid dynamics method and shrinking core model.The flow and temperature field,reduction reaction of iron oxide of a 36 m rotary hearth furnace were calculated by this mathematical mode.The molarity of iron oxides and the iron metallization rate of composite pellets were analyzed.The results of reduction experiment in the literature was carried out to verify the reliability of the model.During one working cycle(25 min),the results show that The velocity of gas in the furnace increased gradually with the flow direction.The temperature of the pellets at the middle diameter of the rotary herath furnace was 1416.7 K,and the iron molarity increases from 3477.50 mol/m^(3) to 9719.94 mol/m^(3),the highest iron metallization rate of the pellets was 90.85%,and the average iron metallization rate was 81.42%.

关 键 词：转底炉 冶金粉尘球团 收缩核模型 直接还原 金属化率 

分 类 号：TF062[冶金工程—冶金物理化学]