50%CO_(2)+50%CO气氛条件下金属化炉料与焦粉耦合过程的非等温反应动力学  

Non-isothermal reaction kinetic analysis of coupling process between metallized burden and coke powder in a 50%CO_(2)+50%CO gas mixture

作　　者：闫瑞军 柳政根 储满生[1,2,3,4] 刘培军 Yan Ruijun;Liu Zhengen;Chu Mansheng;Liu Peijun(School of Metallurgy,Northeastern University,Shenyang 110819,China;Institute for Frontier Technologies of Low-carbon Steelmaking,Northeastern University,Shenyang 110819,China;Liaoning Low-carbon Steelmaking Technology Engineering Research Center,Northeastern University,Shenyang 110819,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]东北大学冶金学院,沈阳110819 [2]东北大学低碳钢铁前沿技术研究院,沈阳110819 [3]东北大学辽宁省低碳钢铁前沿技术工程研究中心,沈阳110819 [4]重庆大学材料与工程学院,重庆400045

出　　处：《材料与冶金学报》2023年第6期511-517,531,共8页Journal of Materials and Metallurgy

基　　金：国家自然科学基金项目(U1808212,52074080);辽宁省兴辽英才计划项目(XLYC1902118);山西省科技重大专项项目(20181102020)。

摘　　要：研究金属化炉料与焦炭的非等温耦合过程,可为阐明新型炉料结构的反应行为提供理论基础.本文中在50%CO_(2)+50%CO气氛下对金属化率为51%的炉料、焦粉及两者混合物料的非等温反应动力学进行研究,采用Coats-Redfern法计算并分析了耦合反应的表观活化能和反应机理.结果表明:混合物料在1 014 K时开始发生氧化增重反应,并在1 248 K时增重速率达到最大,与单金属化炉料的特征温度相近;混合物料的快速失重温度低于单焦粉的快速气化温度,这是由于焦炭气化与炉料还原起到了耦合增效作用;混合物料增重阶段的机理模型由单金属化炉料的R_(2)模型变为F_(2)模型,表观活化能由134.66 kJ/mol增至371.02 kJ/mol;焦粉气化的机理模型为F_(2)模型,表观活化能为389.45 kJ/mol;混合物料失重阶段的机理模型为D_(6)模型,表观活化能为778.04 kJ/mol.Studying the non-isothermal coupling process of metalized burden and coke powder can provide a theoretical basis for elucidating the reaction behavior under the new burden structure.In current study,the non-isothermal reaction kinetics of metallized burden with a metallization ratio of 51%,coke powder,and their mixture under a 50%CO_(2)+50%CO atmosphere have been studied.The apparent activation energies and reaction mechanisms of the coupled reaction have been calculated and analyzed by using the Coats-Redfern method.The results show that the mixture oxidation reaction begins at 1014 K and the reaction rate reaches the maximum at 1248 K,which is close to the characteristic temperature of the single metallized burden.The rapid weight loss temperature of the mixture is lower than that of rapid gasification of single coke powder,and there is a coupling effect between gasification and reduction.As the mixture weight gain reaction mechanism changes from R_(2) model of single metallized burden to F_(2) model,the apparent activation energy increases from 134.661kJ/mol to 371.02 kJ/mol.When the coke powder gasification mechanism is adopted as F_(2) model,the apparent activation energy is 389.45 kJ/mol.When the mixture weight loss apparent mechanism is adopted as D_(6) model,the apparent activation energy is 778.04 kJ/mol.

关 键 词：金属化炉料 焦炭 耦合过程 反应机理 活化能 

分 类 号：TF52[冶金工程—钢铁冶金]