50%CO_(2)+50%CO气氛下金属化炉料非等温反应动力学  

Non-isothermal reaction kinetics of metallized burden in 50%CO_(2)+50%CO gas mixture

作　　者：闫瑞军 储满生 柳政根[1,2,3] 刘培军 YAN Rui-jun;CHU Man-sheng;LIU Zheng-gen;LIU Pei-jun(School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China;Institute for Frontier Technologies of Low-carbon Steelmaking,Northeastern University,Shenyang 110819,Liaoning,China;Liaoning Low-carbon Steelmaking Technology Engineering Research Center,Shenyang 110819,Liaoning,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]东北大学低碳钢铁前沿技术研究院,辽宁沈阳110819 [3]辽宁省低碳钢铁前沿技术工程研究中心,辽宁沈阳110819

出　　处：《中国冶金》2023年第4期33-40,共8页China Metallurgy

基　　金：国家自然科学基金资助项目(52074080);辽宁省兴辽英才计划资助项目(XLYC1902118);山西省科技重大专项项目资助项目(20181102020)。

摘　　要：高炉使用金属化炉料作为一种新型的低碳炼铁技术为高炉炼铁过程深度降碳提供了新的可能。由于金属化炉料的易再氧化性,装入高炉炉顶中的金属化炉料是否能被炉顶煤气中的CO_(2)再氧化成为一个需要关注的问题。对70%金属化率炉料在体积分数为50%CO_(2)+50%CO气体混合物中的非等温反应过程动力学进行了研究。采用KAS动力学分析方法计算了反应过程的表观活化能和反应机理,分析了反应过程的特征温度。结果表明,70%金属化率炉料在50%CO_(2)+50%CO混合气氛中的非等温反应过程表现为单步反应行为,反应的最佳机理模型为化学反应控制的A_(1)模型。金属化炉料低温下反应需要克服较大的反应能垒,主要反应阶段的表观活化能为114.22 kJ/mol,指前因子为2785/s。金属化炉料反应过程随加热速率增大存在滞后现象,加热速率从5 K/min增大到20 K/min时,反应开始温度从1045 K增加至1140 K,快速反应温度从1267 K增加到1470 K,而实际高炉炉顶温度远低于1045 K,因此金属化炉料在高炉顶部不会被煤气中的CO_(2)再氧化。As a new low-carbon ironmaking technology,the use of metallized burden in blast furnace offers new possibilities for deep cuts in CO_(2)emissions.Due to the easy re-oxidation of the metallized burden,the question of whether the metallized burden loaded into the top of blast furnace can be re-oxidized by CO_(2)in the top gas has become a concern.The non-isothermal reaction kinetics of metallized burden with metallization ratio of 70%in 50%CO_(2)+50%CO gas mixture was studied.KAS method was used to calculate the apparent activation energy and reaction mechanism,and the reaction characteristic temperature was analyzed.The results show that the non-isothermal reaction process of metallized burden with metallization ratio of 70%exhibits a single step reaction behavior in 50%CO_(2)+50%CO gas mixture.The optimal reaction mechanism model is A_(1)model controlled by chemical reaction.The reaction of metallized burden at low temperature needs to overcome large reaction energy barrier.The apparent activation energy of main reaction stages is 114.22 kJ/mol,and the pre-exponential factor is 2785/s.The reaction process exhibits hysteretic phenomenon with increasing of heating rate.As the heating rate increases from 5 K/min to 20 K/min,the reaction starting temperature increases from 1045 K to 1140 K,and the rapid reaction temperature increases from 1267 K to 1470 K.However,actual top temperature of blast furnace is far lower than 1045 K.Therefore,the metallized burden will not be re-oxidized by CO_(2)in the gas at the top of blast furnace.

关 键 词：高炉 金属化炉料 CO_(2) 表观活化能 反应机理 

分 类 号：TF53[冶金工程—钢铁冶金]