【作者】 张海鹰；

【导师】 朱苗勇；

【作者基本信息】 东北大学 ， 冶金工程， 2011， 硕士

【摘要】 连铸中间包在现代钢铁生产中起到十分重要的作用,它不仅仅是连接钢包与结晶器之间的中间存储容器,而且是促使夹杂物上浮去除的重要场所,其冶金功能的发挥直接影响高品质钢的生产。中间包内钢液流动的合理控制对其内夹杂物的去除至关重要。因此,开展中间包内去夹杂控流技术研究具有重要的科学意义和现实指导意义。本论文结合国内某厂板坯生产线的实际,采用物理模拟和数学模拟相结合的方法对连铸中间包内的流动行为进行了研究,提出了有效净化中间包钢液的控流方案并实施了现场应用研究。主要研究内容和研究结果如下：(1)采用合理的“抑湍器+单挡墙+单挡坝”和“抑湍器+单挡墙+双挡坝”组合控流装置,均有很好的控流效果。方案DL-02是所有的“抑湍器+单挡墙+单挡坝”中最优的控流方案,而方案DL-12是所有的“抑湍器+单挡墙+双挡坝”中最优的控流方案。(2)方案DL-12在中包出口附近设置的挡坝具有避免开浇结冷钢的作用,推荐该方案为最佳控流方案。(3)采用优化的中间包控流方案后铸坯中的夹杂物控制达到了较理想的水平。尺寸大于30μm的夹杂物得到了有效去除。更多还原

【Abstract】 Continuous casting tundish is playing an important role in the modern steelmaking that not only acts as a distributor between ladles and molds, but also provides the significant opportunity for removal of nonmetallic inclusions from molten steel. The condition of tundish will directly affect the production of high quality of steel.The reasonable control of molten steel flow is crucial for the inclusion removal in the tundish. Therefore, it has important scientific and practical guidance significances for developing the tundish flow control technology. In this paper, the flow characteristics in the tundish were studied by using mathematical and physical simulations according to the slab practical production process in one domestic steel corporation, and one scheme of flow control devices for cleaning the molten steel in the tundish. In addition, the effectiveness of applying the optimal flow control devices to the actual performance was investigated. The main contents and results obtained are as follows:(1) The appropriate combination of turbulence inhibitor, one weir and one dam and the combination of turbulence inhibitor, one weir and two dams can improve the flow characteristics in tundish. And case DL-02is the best one for the flow control within those cases of the combination of turbulence inhibitor, one weir and one dam. While case DL-12is the best one for the flow control within those cases of the combination of turbulence inhibitor, one weir and two dams.(2) The dam located near the outlet in the case DL-12can avoid the steel freezing in the outlet at the beginning of casting, so case DL-12is the best one for the flow control in the tundish.(3) Inclusion controlling reaches a perfect level with the use of optimized flow control scheme in the tundish.Inclusions larger than30μm are effectively removed.更多还原