模拟高炉升温制度下球团矿富氢还原机制研究  

Study on hydrogen-rich reduction mechanismof pellets under simulated blast furnace heating conditions

作　　者：谢书培 吕斌斌 王广[1] 王静松[1] 左海滨[1] 薛庆国[1] Xie Shupei;Lv Binbin;Wang Guang;Wang Jingsong;Zuo Haibin;Xue Qingguo(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing)

机构地区：[1]北京科技大学绿色低碳钢铁冶金全国重点实验室

出　　处：《冶金能源》2024年第3期22-26,共5页Energy For Metallurgical Industry

基　　金：国家自然科学基金(U1960205,No.51804024);中国宝武低碳冶金技术创新基金(BWLCF202101)。

摘　　要：文章研究了模拟高炉升温制度下,球团矿在不同还原气体成分(H_(2)含量0%、10%、20%、30%、40%)下的还原行为,并利用未反应核模型,分析了球团矿富氢还原的动力学以及反应过程中球团的宏观结构变化。结果表明:随着还原气体中H_(2)含量的增加,球团矿终点还原度从52.45%提高到84.09%,并且在全氢条件下还原开始温度比全CO时提高了63℃。此外动力学分析发现,该反应首先受到化学反应的控制,然后逐渐受到化学反应和内部扩散的混合控制。对球团矿控制步骤转变处的结构分析发现,其穿透率随H_(2)含量增加从2.3%增高到42.3%。研究可为高炉富氢还原过程的机理解析和工艺参数的优化控制提供一定程度的参考。In the paper,the reduction behavior of pellets under different reducing gas components(H_(2) volume fraction content 0%,10%,20%,30%,40%)under simulated blast furnace heating system was studied.The kinetics of hydrogen-rich reduction of pellets and the macroscopic structure changes of pellets during the reaction were analyzed by using the unreacted core model.The results show that with the increase of hydrogen content in the reducing gas,the final reduction degree of pellets increased from 52.45%to 84.09%,and the reduction starting temperature under full hydrogen condition was 63℃ higher than that under full CO condition.In addition,the kinetic analysis showed that the reaction was first controlled by the chemical reaction,and then gradually controlled by the mixture of chemical reaction and internal diffusion.The structural analysis of the pellet control step transition showed that the penetration rate increases from 2.3%to 42.3%with the increase of hydrogen content.This study can provide a certain degree of reference for the mechanism analysis of the hydrogen-rich reduction process of blast furnace and the optimal control of process parameters.

关 键 词：球团矿 氢气 还原行为 动力学 穿透率 

分 类 号：TF046.6[冶金工程—冶金物理化学]