浸入式水口结构对板坯结晶器液面波动的影响  

Influence of submerged immersion nozzle structure on liquid surface fluctuation in slab continuous-casting mold

作　　者：陈刚 周海龙 喻林 钟良才[2] 张开坚 CHEN Gang;ZHOU Hailong;YU Lin;ZHONG Liangcai;ZHANG Kaijian(Xichang Steel Vanadium Co.,Ltd.,Panzhihua Iron and Steel Group Corporation,Xichang 615032,China;School of Metallurgy,Northeastern University,Shenyang 110004,China)

机构地区：[1]攀钢集团西昌钢钒有限公司,四川西昌615032 [2]东北大学冶金学院,辽宁沈阳110004

出　　处：《炼钢》2018年第5期50-56,共7页Steelmaking

摘　　要：以1∶2. 3的几何相似比,建立了断面230 mm×1 930 mm板坯结晶器的钢液流动物理模型,研究不同的浸入式水口对结晶器流体流动和液面波动的影响,并进行了工业试验,测定了实际结晶器钢液面的波动。结果表明,凸底特别是较高凸底的浸入式水口容易在板坯结晶器两侧产生明显的不对称流动,结晶器两侧交替出现明显的液面凹陷,使得液面各点的波动差别大,且随浸入式水口浸入深度的增加液面波动不降低,在结晶器宽面1/4附近区域的液面波动比其它区域大。凹底的浸入式水口能够减轻结晶器两侧的不对称流动,从而避免液面凹陷的发生,液面各点的波动差别减小,液面波动随浸入式水口的浸入深度增加而下降。工业试验中优化的浸入式水口的结晶器液面波动的平均波高、最大波峰和最大波谷比原浸入式水口分别降低21. 70%,30. 70%和29. 18%。A physical model of liquid steel flowing in a 230 mm × 1 930 mm slab continuous-casting mold was set up at 1：2.3 geometric similarity ratio, and liquid surface fluctuation at different positions in the model mold was measured. Influence of different submerged immersion nozzles （SENs） on fluid flowing and level fluctuation in the mold was investigated. Industrial experiments were conducted in a two-strand tundish to measure the fluctuation of liquid steel surface in molds with the optimal and the former SENs. It was shown in the investigation that apparent asymmetrical flow easily formed at the two sides in the mold from the SENs with the mountain bottom, especially the higher mountain bottom,and surface depression phenomena appeared alternately at the two sides of the mold on the liquid surface, which resulted in larger fluctuation difference at different points of the liquid surface, no decrease in fluctuation with increase in immersion depth of the SENs and larger surface fluctuation within 1/4 neighborhood zone along the wideness face of the mold then that in other zones. The extension of asymmetrical flow at the two sides of the mold with the well bottom SENs became less and the surface depression was avoided. The fluctuation difference at different points on the liquid surface decreased and the fluctuation of liquid level decreased with the increase of immersion depth of the SENs. In the industrial experiment, the average wave height, the maximum wave peak and the maximum wave trough with the optimal SEN were reduced by 21.70 % ,30.70 % and 29.18 %, respectively, in comparison with the former one.

关 键 词：板坯连铸 结晶器 浸入式水口 液面波动 物理模拟 工业试验 

分 类 号：TF777[冶金工程—钢铁冶金]