电磁搅拌对液态夹杂物聚并及去除行为的影响规律

doi:10.13228/j.boyuan.issn1005-4006.20220082

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摘要高拉速连铸具有高效、低成本的特点,是未来连铸的发展方向。以常规板坯结晶器为研究对象,基于大涡模拟理论及欧拉-拉格朗日方法,对CSP结晶器内的多相流动及夹杂物碰撞聚并及去除行为展开深入分析。结果表明,电磁搅拌加剧了钢液在结晶器中的湍流强度,并促使更多夹杂物聚并上浮至渣金界面。并且,由于水平方向流速较大,钢液射流被限制在了电磁搅拌区域,显著降低了钢液射流深度,有利于夹杂物上浮。此外,由于电磁力的存在加剧了渣金界面波动,容易造成卷渣,因此,电磁搅拌对夹杂物的去除影响是双向的,既会提升内生夹杂物去除率,也会增加外来夹杂物的卷入风险。本模型对控制CSP结晶器连铸过程具有一定指导意义。

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关键词 ：电磁搅拌, 夹杂物, 卷渣, 渣金界面, 连铸

Abstract：The characteristics of high casting speed is high efficiency and low cost, which indicates the future of continuous casting process. In this work, the multiphase flow and inclusion removements in a CSP mold are studied based on the Large Eddy Simulation model and Eulerian-Lagrange approach. Results reveal that the electromagnetic stirring (EMS) significantly intensifies turbulence in a continuous casting mold and remove more inclusions into the liquid slag. What's more, the transverse velocity is enhanced due to EMS and thus the injection of steel is confined with the mold, which significantly reduces the injection depth of liquid steel and beneficial for the floating of inclusions. In addition, due to the fact that horizontal velocity is high, the injection is confined within the electromagnetic stirring zone, which significantly reduces the injection depth of molten steel, promoting floating of inclusions. In addition, because the flow field is intensified under the effect of EMS, the slag-metal interface fluctuates more frequently, so more slag drops are involved into the steel. So the EMS has double-sided effects: Although it may enhance the removing rate of inclusions, it may also run the risk of slag entrapment into the steel. This model has a certain guiding significance to control the production of high drawing speed continuous casting slab.

Key words： mold electromagnetic stirring inclusions slag entrapment slag-metal interface continuous casting

收稿日期: 2022-05-12

引用本文:

李向龙, 孙群, 屈天鹏, 王德永. 电磁搅拌对液态夹杂物聚并及去除行为的影响规律[J]. 连铸, 2023, 42(1): 10-17. LI Xiang-long, SUN Qun, QU Tian-peng, WANG De-yong. Effect of electromagnetic stirring on the aggregation and removement of liquid inclusions in continuous casting mold. CONTINUOUS CASTING, 2023, 42(1): 10-17.

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