基于二维隐式差分方程的大圆坯温度场模拟  

Simulation for temperature field of large round billet based on two-dimensional implicit difference equation

作　　者：张磊 岳峰 郑力宁 翟万里 张洪才 ZHANG Lei;YUE Feng;ZHENG Lining;ZHAI Wanli;ZHANG Hongcai(l.Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing100083,China;Chief Engineer's Office,Jiangsu Shagang Croup Huai Steel Special Steel Corporation,Huaian 223002,Jiangsu,China)

机构地区：[1]北京科技大学钢铁共性技术协同创新中心,北京100083 [2]江苏沙钢集团淮钢特钢有限公司总工办,江苏淮安223002

出　　处：《连铸》2024年第4期52-58,共7页Continuous Casting

摘　　要：为了研究大圆坯凝固传热情况,以某钢厂大圆坯连铸过程为研究对象,基于传热微分方程,采用有限差分法中的隐式差分进行求解,建立了极坐标下大圆坯二维凝固传热模型。利用计算机语言C++进行程序编译,采用现场测温的方法进行模型验证。通过模型的应用研究发现,拉速的改变对结晶器出口温度、凝固终点等数据影响较大,拉速每提升0.02 m/min,凝固终点后移1.8 m;过热度的改变对铸坯表面温度、液相穴长度等数据影响较小,过热度每提高10℃,液相长度仅增加0.6 m;从铸坯表面温度下降速率来看,结晶器阶段温降最快,此时铸坯处于初生坯壳快速生长期,在二冷Ⅱ区出现回温现象;可以根据模拟情况调整工艺提升铸坯质量。To study the heat transfer during solidification of large round billets,the continuous casting process of large round billets was taken in a certain steel plant as the research object.Based on the differential equation of heat transfer,the implicit difference method in finite difference methods was adopted to solve the problem and a two-di-mensional solidification heat transfer model of large round billets was established in polar coordinates.The computer language C++for program compilation was used and the model was verified through on-site temperature measure-ment.Through the application of the model,it is found that the change of casting speed has a great influence on the mold outlet temperature,solidification end point and other data.For every O.02 m/min increase in casting speed,the solidification end point moves backward by 1.8 m.The change of superheat has a small influence on the surface temperature of the billet and the length of the liquid phase.For every 10℃ increase in superheat,the length of the liquid phase only increases by O.6 m.Judging from the rate of temperature drop on the surface of the billet,the temperature drop in the mold stage is the fastest,during which the billet is in the rapid growth stage of the primary shell,and there is a temperature recovery phenomenon in the secondary cooling zone II.The quality of slab can be improved by adjusting the process according to the simulation.

关 键 词：大圆坯 凝固传热 拉速 过热度 表面温度 

分 类 号：TF777[冶金工程—钢铁冶金]