两流连铸中间包换包过程多相流动及钢液二次氧化的数值模拟研究

王璟丞; 刘珍童; 陈威; 陈宏亮; 张立峰

doi:10.1007/s12613-024-2909-5

Volume 31 Issue 7

Jul. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(7): 1540-1553

Jingcheng Wang, Zhentong Liu, Wei Chen, Hongliang Chen, and Lifeng Zhang, Numerical simulation on the multiphase flow and reoxidation of the molten steel in a two-strand tundish during ladle change, Int. J. Miner. Metall. Mater., 31(2024), No. 7, pp. 1540-1553. https://doi.org/10.1007/s12613-024-2909-5

Cite this article as:

Jingcheng Wang, Zhentong Liu, Wei Chen, Hongliang Chen, and Lifeng Zhang, Numerical simulation on the multiphase flow and reoxidation of the molten steel in a two-strand tundish during ladle change, Int. J. Miner. Metall. Mater., 31(2024), No. 7, pp. 1540-1553. https://doi.org/10.1007/s12613-024-2909-5

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研究论文

两流连铸中间包换包过程多相流动及钢液二次氧化的数值模拟研究

1)
燕山大学机械工程学院, 秦皇岛 066004, 中国
2)
天津大学材料科学与工程学院, 天津 300350, 中国
3)
北方工业大学机械与材料工程学院, 北京 100144, 中国

通讯作者:
陈威 E-mail: weichen@ysu.edu.cn

张立峰 E-mail: zhanglifeng@ncut.edu.cn

文章亮点

(1) 通过数值模拟研究了连铸中间包换包非稳态浇注过程钢液–渣–空气的多相流动，预测了中间包换包过程渣眼的形成以及消失过程

(2) 通过建立耦合的钢液多相流二次氧化数值模型，预测了换包过程钢液二次氧化以及溶解氧在中间包内扩散的过程

(3) 通过定量对比提出了对于适用于目前条件下减小中间包换包过程二次氧化影响的工艺参数

中文摘要

连铸中间包在生产过程中起着调节和均匀钢液成分、稳流分流以及连铸衔接的作用。然而，在中间包换包非稳态过程中钢液液面波动剧烈，使得钢液裸露造成二次氧化，降低了钢产品质量。本文通过建立三维数学模型计算了中间包换包过程中60 t两流连铸中间包内钢液–渣–空气多相流动，并在此基础上耦合二次氧化模型研究了再充包过程由于钢液裸露引起的二次氧化以及溶解氧从渣眼扩散到钢液中的过程。讨论了不同再充包速度下钢液的二次氧化和溶解氧的扩散。研究结果表明，在钢包更换的高速再填充过程中，入口速度的增加与会使渣眼面积增加，同时进入中间包的溶解氧总量也会增加。再充包过程入口速度为3.0 m⋅s^–1工况二次氧化最严重，中间包内钢液的平均溶解氧质量分数增加了0.000145%。相比之下，入口速度为1.8 m⋅s^–1工况的平均溶解氧质量分数增加了0.000035%。定量对比换包过程溶解氧含量的增加以及换包过程中钢液的暴露时间，入口速度为1.8 m⋅s^–1工况二次氧化影响最小。因此，更换钢包时应该降低浇注速度。

关键词:

Research Article

Numerical simulation on the multiphase flow and reoxidation of the molten steel in a two-strand tundish during ladle change

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Abstract

Abstract

A 3D mathematical model was proposed to investigate the molten steel–slag–air multiphase flow in a two-strand slab continuous casting (CC) tundish during ladle change. The study focused on the exposure of the molten steel and the subsequent reoxidation occurrence. The exposure of the molten steel was calculated using the coupled realizable k–ε model and volume of fluid (VOF) model. The diffusion of dissolved oxygen was determined by solving the user-defined scalar (UDS) equation. Moreover, the user-defined function (UDF) was used to describe the source term in the UDS equation and determine the oxidation rate and oxidation position. The effect of the refilling speed on the molten steel exposure and dissolved oxygen content was also discussed. Increasing the refilling speed during ladle change reduced the refilling time and the exposure duration of the molten steel. However, the elevated refilling speed enlarged the slag eyes and increased the average dissolved oxygen content within the tundish, thereby exacerbating the reoxidation phenomenon. In addition, the time required for the molten steel with a high dissolved oxygen content to exit the tundish varied with the refilling speed. When the inlet speed was 3.0 m·s⁻¹ during ladle change, the molten steel with a high dissolved oxygen content exited the outlet in a short period, reaching a maximum dissolved oxygen content of 0.000525wt%. Conversely, when the inlet speed was 1.8 m·s⁻¹, the maximum dissolved oxygen content was 0.000382wt%. The refilling speed during the ladle change process must be appropriately decreased to minimize reoxidation effects and enhance the steel product quality.
- tundish;
- ladle change;
- reoxidation;
- multiphase flow;
- numerical simulation

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References

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