炉顶煤气循环氧气高炉一维气固换热与反应动力学模型  

One-dimensional mathematical model for oxygen blast furnaces with top gas recycling based on heat transfer and reaction kinetics

作　　者：金鹏[1] 姜泽毅[1,2] 包成[1,2] 陆元翔 张建良[3] 张欣欣[1,4] 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]北京科技大学北京高校节能与环保工程研究中心,北京100083 [3]北京科技大学冶金与生态工程学院,北京100083 [4]北京科技大学冶金工业节能减排北京市重点实验室,北京100083

出　　处：《工程科学学报》2015年第4期499-508,共10页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(51134008);国家重点基础研究发展计划资助项目(2012CB720401)

摘　　要：结合风口回旋区燃烧和炉外煤气预热、脱除和循环的平衡关系,建立了氧气高炉一维气固换热与反应动力学模型,并采用传统高炉的运行和解剖数据对模型进行了验证分析.通过模型研究了氧气含量和上部循环煤气流量对氧气高炉炉内过程变量的影响规律.结果表明：氧气含量偏低和上部循环煤气流量不足时,会降低铁矿石还原效果,炉渣内出现大量未还原铁氧化物;氧气含量和上部循环煤气流量的提高可以有效提高炉内CO含量和铁矿石还原速度,但提高上部循环煤气流量会大幅提升炉顶煤气温度,增大热量损失.与传统高炉相比,氧气高炉内CO含量提高1.0-1.5倍,炉内气体还原性更强;铁矿石还原完成位置提高1.49 m,全炉还原反应速度更快;直接还原度降低55.2%-79.2%,炉内直接还原反应消耗的碳量更少.A one-dimensional mathematical model based on heat transfer and reaction kinetics was developed for an oxygen blast furnace and was validated with the operating conditions and dissected data of a conventional blast furnace. The influence of oxygen concentration and upper gas volume on the smooth operation and process variables of the oxygen blast furnace was investigated by the model combined with coal combustion at tuyeres and top gas balance for separation and preheating. When the oxygen blast furnace with top gas recycling is of low oxygen concentration and upper gas volume, the reduction of iron ore is worsen and massive unreduced iron oxide comes into slag. In the oxygen blast furnace with top gas recycling, oxygen concentration and upper gas volume have significant effect on the temperature, reducing ability of gas and reduction rate. A comparative analysis of the conventional blast furnace and the oxygen blast furnace with top gas recycling show that the oxygen blast furnace has a higher reducing ability of gas （ 1.0 to 1.5 times higher for CO content）, faster reduction rate （ 1.49 m higher for the position of ore reduction）, and less direct reduction （55.2% to 79.2% less for direct reduction degree）.

关 键 词：高炉 数学模型 煤气 循环 稳态 传热 反应动力学 

分 类 号：TF559[冶金工程—钢铁冶金]