自制动浸入式水口对结晶器内液面波动的影响.pdfVIP

自制动浸入式水口对结晶器内液面波动的影响 1 1 1 2 陈永峰 张立峰 李京社 李树森 （1．北京科技大学冶金与生态工程学院；2.首钢迁钢公司炼钢厂 ） 摘 要 本文介绍了一种新型的适用于板坯连铸的浸入式水口。相对于传统的双出口水口，这种新型的自制动水 口具有四个出口，在水口两侧分别有一个下倾的上部出口和一个上倾的下部出口，从这两个出口流出的射流能够彼 此互相冲击，因此可以降低射流的湍动能和速度。本文通过物理模拟方法，研究了自制动浸入式水口对结晶器内液 面波动的影响，同时探讨了拉速和水口浸入深度的影响。实验结果表明，自制动水口对钢液流动的制动效果明显， 能有效降低水口出口处钢液流的速度。使用自制动水口，结晶器内液体流动更加对称，弯月面也更加趋于平稳，尤 其在高拉速情况下。 关键词 物理模拟 自制动浸入式水口 液面波动 Effect of Self-braking Submerged Entry Nozzle on the Level Fluctuation in Mold Chen Yongfeng1 Zhang Lifeng1 Li Jingshe1 Li Shusen1 (1. University of Science and Technology Beijing, School of Metallurgy and Ecological Engineering; 2. Qian’an Steelmaking Co., Ltd., Shougang Group) Abstract The current study proposed a new concept of submerged entry nozzle (SEN) for slab continuous casting process. Compared to the traditional two-port SEN, the proposed self-braking SEN has four ports, two at each side and the upper one is downwards and the lower one is upwards, by which the two jets from the upper port and the lower jets collide each other, therefore, the high energy is dissipated, and the jet speed is lowered. The effect of self-braking SEN on the level fluctuation in continuous casting mold was investigated using water modeling, and the effects of casting speed and submergence depth of SEN were also discussed. The result indicates that the self-braking SEN can obviously decrease the jet speed and with the self-braking SEN, the flow in the mold was less asymmetrical and the meniscus was more uniform than the conventional nozzle,