钢包出钢末期漩涡抑制机理探究及防漩设计

doi:10.11900/0412.1961.2017.00365

金属学报

2018, Vol. 54

Issue (7): 959-968 DOI: 10.11900/0412.1961.2017.00365

本期目录 | 过刊浏览

钢包出钢末期漩涡抑制机理探究及防漩设计

王强^1,²(

), 王连钰^1,³, 李宏侠¹, 蒋佳伟¹, 朱晓伟^1,³, 郭占成², 赫冀成¹

1 东北大学材料电磁过程研究教育部重点实验室沈阳 1108192
2 北京科技大学钢铁冶金新技术国家重点实验室北京 1000833
3 东北大学冶金学院沈阳 110819

Suppression Mechanism and Method of Vortex During Steel Teeming Process in Ladle

Qiang WANG^1,²(

), Lianyu WANG^1,³, Hongxia LI¹, Jiawei JIANG¹, Xiaowei ZHU^1,³, Zhancheng GUO², Jicheng HE¹

1 Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China
2 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
3 School of Metallurgy, Northeastern University, Shenyang 110819, China

引用本文:

王强, 王连钰, 李宏侠, 蒋佳伟, 朱晓伟, 郭占成, 赫冀成. 钢包出钢末期漩涡抑制机理探究及防漩设计[J]. 金属学报, 2018, 54(7): 959-968.
Qiang WANG, Lianyu WANG, Hongxia LI, Jiawei JIANG, Xiaowei ZHU, Zhancheng GUO, Jicheng HE. Suppression Mechanism and Method of Vortex During Steel Teeming Process in Ladle[J]. Acta Metall Sin, 2018, 54(7): 959-968.

全文: PDF(2302 KB) HTML

摘要:

为了抑制钢包出钢末期出现的漩涡卷渣现象,进而提高钢液的洁净度和钢材质量,从对漩涡形成影响较大的水口偏心率入手,通过数值模拟和水模型实验,重点分析了不同偏心率条件下漩涡的运动过程和速度场的变化规律。研究发现,通过改变出钢过程中漩涡形成时的速度场分布形式和速度值的大小,可以改变漩涡的运动轨迹和趋势,进而降低漩涡的临界高度,有效抑制漩涡的形成。在此基础上,设计出底部吹气的防漩方法,得到最佳的吹气流量和吹气孔位置。

关键词 ：洁净钢, 钢包出钢, 自由表面涡, 卷渣, 漩涡抑制机理

Abstract：

With the developments of science and technology, the performance of steel is required strictly and the quality of steel needs to improve continuously. In continuous casting process, there is an important flow phenomenon when the molten steel flows from ladle to tundish. It is that the rapidly rotating free surface vortex will form as the liquid level descending continuously. The surface vortex can cause the slag entrainment. In order to suppress slag entrainment by vortex during the steel teeming process, and to improve the cleanliness and quality of steel, the movement process of vortex and variation of flow field are studied through both numerical simulation and water model experiments. Since the eccentricity (eccentricity is the ratio of the nozzle distance and the ladle radius) has a large effect on the vortex formation, the vortex movement and flow field variation at different eccentricities are analyzed in details. And the mechanism of vortex suppression is found. It is that disturbing the velocity distribution of vortex formation or/and decreasing the tangential velocity value can suppress the movement and development of vortex. Thus the critical height of vortex can be decrease and the vortex can be availably suppressed. And then a method of vortex suppression is proposed according to this mechanism of vortex suppression. The method by blowing gas at the bottom of ladle is proposed. And the optimal gas flow rate and gas nozzle position are obtained.

Key words： clean steel steel teeming of ladle free surface vortex slag entrapment suppression mechanism of vortex

收稿日期: 2017-08-30

ZTFLH:

TF775

基金资助:国家自然科学基金委员会-宝钢集团有限公司联合研究基金项目No.U1560207,北京科技大学钢铁冶金新技术国家重点实验室开放基金项目No.KF12-07

作者简介:

作者简介王强,男,1971年生,教授,博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2017.00365 或 https://www.ams.org.cn/CN/Y2018/V54/I7/959

表1 数值模拟和水模型中流体的物性参数

图1 模拟结果与实验结果[27]比较以及钢包内漩涡形成高度示意图

表2 钢包水模型和原型的尺寸

图2 实验装置示意图

图3 吹气孔位置示意图

图4 不同偏心率条件下0.05 m处不同时刻的涡量图

图5 不同高度处的切向速度

图6 临界高度随吹气流量的变化

图7 临界高度随吹气孔位置的变化

图8 不同吹气流量下切向速度随高度的变化

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