Large Eddy Simulation of Molten Steel Flow and Inclusion Transport in a New Butterfly-Type Induction Heating Tundish

Ning Wang, Zhongqiu Liu, Huang Cheng, Fengsheng Qi, Changjun Wang, Li Zhang, Baokuan Li
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Abstract

In addressing the retrofitting issues of conventional non-induction heating tundish, a novel butterfly-type induction heating tundish model was devised. A three-dimensional coupled mathematical model of magnetic, thermal, and fluid fields was established to investigate the temperature distribution, flow characteristics, and temperature rise curves within the butterfly-type tundish. The model for inclusion motion and removal, based on Large Eddy Simulation (LES), was devised, integrating factors such as normal critical velocity, coefficient of restitution, and critical incident angle at the wall boundary conditions to provide a more precise depiction of the reflection and adsorption processes of inclusions on the tundish wall. The findings suggest that induction heating can effectively offset the temperature loss of the molten steel and enhance the removal rate of inclusions, particularly those of large size. The outlet temperature increases by − 15 K, 7 K, 15 K, and 26 K, and the total removal rate of inclusions reaches 69.18, 83.37, 87.69, and 92.01 pct at 0, 600, 800, and 1000 kW, respectively. The channel serves as the primary site for inclusion removal when employing induction heating. Among these, the removal rates within the channel and at the slag layer exhibit a positive correlation with the inclusion diameter, while the remaining wall removal rates show a negative correlation. The implementation of induction heating technology leads to a notable decrease in the entry of large-sized inclusions into the mold.

Abstract Image

新型蝶形感应加热连铸机中钢水流动和夹杂物迁移的大涡流模拟
为解决传统非感应加热外锅的改造问题,设计了一种新型蝶式感应加热外锅模型。建立了磁场、热场和流体场的三维耦合数学模型,以研究蝶形中间包内的温度分布、流动特性和温升曲线。以大涡流模拟(LES)为基础,设计了夹杂物运动和去除模型,综合了法向临界速度、恢复系数和壁面边界条件的临界入射角等因素,更精确地描述了夹杂物在中间包壁面上的反射和吸附过程。研究结果表明,感应加热可以有效抵消钢水的温度损失,提高夹杂物的去除率,尤其是大尺寸夹杂物的去除率。在 0、600、800 和 1000 kW 条件下,出口温度分别提高 - 15 K、7 K、15 K 和 26 K,夹杂物的总去除率分别达到 69.18、83.37、87.69 和 92.01 pct。在采用感应加热时,通道是去除夹杂物的主要部位。其中,通道内和熔渣层的去除率与夹杂物直径呈正相关,而其余壁面的去除率则呈负相关。采用感应加热技术后,大尺寸夹杂物进入模具的情况明显减少。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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