赤铁矿粉在H_(2)气氛中闪速还原过程的数值模拟  

Numerical simulation for flash reduction behavior of hematite fines in hydrogen atmosphere

作　　者：国爱 曲迎霞[1,2] 邢力勇 高叶 邵磊 邹宗树[1,2] GUO Ai;QU Ying-xia;XING Li-yong;GAO Ye;SHAO Lei;ZOU Zong-shu(Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education),Northeastern University,Shenyang 110819,Liaoning,China;School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China;Research Institute,Hegang Technology of Materials,Shijiazhuang 050023,Hebei,China)

机构地区：[1]东北大学多金属共生矿生态化冶金教育部重点实验室,辽宁沈阳110819 [2]东北大学冶金学院,辽宁沈阳110819 [3]河钢材料技术研究院,河北石家庄050023

出　　处：《中国冶金》2023年第5期27-36,共10页China Metallurgy

基　　金：国家自然科学基金资助项目(51504056)。

摘　　要：为了考察赤铁矿粉在不同反应条件下的闪速还原行为,基于欧拉-拉格朗日方法建立了描述赤铁矿粉在氢气气氛中闪速还原过程的数学模型。通过数值计算获得了反应器内气粒两相的温度分布、速度分布以及颗粒运动轨迹,并对赤铁矿粉在反应器中的闪速还原过程进行了分析,考察了炉温、氢气体积分数、粒度等操作条件对闪速还原行为的影响。结果表明,当炉温不高于1550 K时,赤铁矿粉在运动过程中经历了升温、热分解和气-固还原反应;当炉温高于1550 K时,赤铁矿粉还会发生气-液还原反应且该反应区域随着炉温和氢气体积分数的升高而增大。当氢气体积分数为40%时,炉温每升高150 K,粒度为53~64μm的赤铁矿粉在0.5 m反应区内的最终还原度提高约40个百分点。模型的建立为闪速还原炼铁技术的开发提供了理论指导。In order to investigate the flash reduction behavior of hematite fines under different reaction conditions,a mathematical model describing the flash reduction process of hematite fines in hydrogen atmosphere was established based on Euler-Lagrange method.The temperature distribution,velocity distribution and particle trajectories of gas-particle two-phase flow in the reactor were obtained by numerical calculation.The flash reduction process of hematite fines in the reactor was analyzed,and effects of operating conditions such as reactor temperature,hydrogen volume fraction and particle size on the flash reduction behavior were investigated.The results show that when the reactor temperature is not higher than 1550 K,hematite fines undergo heating,thermal decomposition and gas-solid reduction during movement,while the reactor temperature is higher than 1550 K,hematite fines also undergo gas-liquid reduction,and the gas-liquid reduction area expands with the increase of reactor temperature and hydrogen volume fraction.When the hydrogen volume fraction is 40%,the final reduction degree of hematite fines with particle size of 53-64μm increases by 40 percentage point for every 150 K increase in reactor temperature.The establishment of model provides theoretical guidance for the development of flash reduction ironmaking technology.

关 键 词：赤铁矿粉 气粒两相 闪速还原 动力学模型 数值模拟 

分 类 号：TF55[冶金工程—钢铁冶金]