摘要
结合国内某钢厂的30 t六流矩形坯连铸中间包建立全结构物理模型进行流-固-热耦合数值模拟,研究了中间包内流场、温度场及应力分布行为,基于考虑热效应的von Mises应力评估了耐火材料的破坏情况;建立抑湍器-多孔挡墙一体式控流元件破坏模型,并对比分析了该控流元件破坏前后中间包内的流动及传热行为。结果表明,该六流中间包内各流体域、固体域的体积平均温度差别较大,工作层与渣层、空气层接触的壁面最大温差分别可达312、578 K,壁面应力分别达到了40~52、52~73 MPa,高于与钢液接触壁面的应力(32~40 MPa)。一体式控流元件中,易破坏区域主要为3个部位:抑湍器、挡墙导流孔、多孔挡墙角部与侧壁及底部连接处,应力均达到了35~52 MPa。一体式控流元件破坏后,1、2号出口的响应时间分别降低了26、17 s,活塞区体积分数下降了25.5%,死区体积分数上升了9.4%,各流一致性明显变差,3号出口外侧角部钢液最低温度下降14 K。现场工业试验表明,本文数值模拟得到的一体式控流元件破坏形貌与实际破坏情况吻合性较好。
A full-structure physical model was established based on a 30-ton six-strand rectangular billet continuous casting tundish in a domestic steel plant,and the fluid-solid-thermal coupling numerical simulation was carried out.The flow field,temperature field and stress distribution behavior in the tundish were studied.Based on the von Mises stress considering the thermal effect,the damage of the refractory was evaluated.A damage model of the turbulence inhibitor-porous baffle integrated flow control element was established,and the flow and heat transfer behaviors in the tundish before and after the damage of the flow control element were compared and analyzed.The results show that the average volume temperature of each fluid domain and solid domain in the six-strand tundish is quite different.The maximum temperature difference between the working layer and the slag layer and the air layer can reach 312and 578K,respectively.The stress of the wall surface reaches 40-52and 52-73MPa,respectively,which is higher than that of the wall surface in contact with the molten steel(32-40MPa).In the integrated flow control element,the easily damaged area is mainly three parts:a turbulence suppressor,a retaining wall diversion hole,and the connection between the corner of the porous retaining wall and the side wall as well as the bottom.The stress in these parts reaches 35-52MPa.After the failure of the integrated flow control element,the response time of No.1and No.2outlets decreased by 26and 17srespectively,the volume fraction of the piston zone decreased by 25.5%,the volume fraction of the dead zone increased by 9.4%,and the consistency of each flow was obviously weakened.The minimum temperature of molten steel at the outer corner of No.3outlet decreased by 14 K.The field industrial test shows that the failure morphology of the integrated flow control element obtained by numerical simulation in this paper is in good agreement with the actual failure situation.
作者
薛秉睿
郑淑国
朱苗勇
XUE Bingrui;ZHENG Shuguo;ZHU Miaoyong(School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China)
出处
《连铸》
北大核心
2025年第1期36-47,共12页
Continuous Casting
基金
国家自然科学基金资助项目(52174310)。
关键词
多流中间包
全结构物理模型
流固热耦合
温度场
热应力
multi-strand tundish
full-structure physical model
fluid-solid-heat coupling
temperature field
thermal stress
