铁矿石竖炉氢气直接还原温度场模拟  

Simulation on Temperature Distribution in Reduction Zone of Iron Ore Hydrogen DR Shaft Furnace

作　　者：白明华[1] 韩少峰[1] 徐宽[1] 李路叶 吕建超[1] 张伟亚[1] 

机构地区：[1]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004

出　　处：《钢铁钒钛》2016年第5期106-111,共6页Iron Steel Vanadium Titanium

基　　金：科技型中小企业技术创新基金无偿资助项目(12C26211300726);河北省科技型中小企业技术创新资金项目(12C1303351003)

摘　　要：以BL竖炉及工艺参数为计算依据,建立气固传热模型,采用计算流体软件Fluent模拟计算。将球团矿简化为多孔介质,物料的运动采用滑移网格模拟,还原反应采用三步反应参与计算,得到氢气直接还原铁竖炉还原段的温度场,并计算还原气的热效率。结果表明:在一定范围内,随着氢气气量的增加还原段温度梯度逐渐变窄,炉顶气温度逐渐升高,并且还原气的热效率逐渐降低。同时也能够得出还原产物随高度的变化情况。简化的竖炉还原段气固传热模型适用于氢气直接还原竖炉还原段温度场的预测以及炉内反应产物的分析。Based on the technical and process parameters of BL shaft furnace, a gas-solid phases heat transfer model was built for simulation together with Fluent software. The pellets were taken as porous media and movement of pellets had been simulated through sliding mesh method. Reduction reactions in- volved in the calculation using the three-step reaction ,we can get the temperature field and thermal effi- ciency in the reduction zone of hydrogen DRI shaft furnace. The results showed that with the increase of the hydrogen flow, the temperature gradient of reduction zone became narrow, the temperature of the re- duction gas at the outlet was higher and the thermal efficiency of the reduction gas decreased. The per- centage of reduced products as a function of distance from shaft inlet can be simulated. It indicated that the simplified gas-solid heat transfer model can be used to analyze the temperature field and reactants in the reduction zone of hydrogen DRI shaft furnace.

关 键 词：竖炉 氢气 直接还原 传热模型 温度场 热效率 

分 类 号：TF554[冶金工程—钢铁冶金]