单流板坯中间包控流装置优化的数理模拟及应用  

Physical-numerical simulation and application of optimization of flow control device in a single-stand slab tundish

作　　者：黄磊 谢旭琦 张华[1] 李宇翔 黄在京 黄柯杰 方庆[1,3] Huang Lei;Xie Xuqi;Zhang Hua;Li Yuxiang;Huang Zaijing;Huang Kejie;Fang Qing(Key Laboratory of Iron and Steel Metallurgy and Resource Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Guangxi Beigang New Material Co.,Ltd.,Beihai 536000,Guangxi,China;Hunan Valin Xiangtan Iron and Steel Company Limited,Xiangtan 411101,Hunan,China)

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [2]广西北港新材料有限公司,广西北海536000 [3]湖南华菱湘潭钢铁有限公司,湖南湘潭411101

出　　处：《钢铁钒钛》2024年第6期133-141,共9页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金资助项目(52004191);中国博士后科学基金资助项目(2022M711120);湖北省教育厅科学技术研究项目(B2022020)。

摘　　要：合理的控流装置结构和布局是提升中间包内钢液洁净度的关键。采用数值模拟与水力学模拟相结合的方法对某厂单流板坯中间包控流装置不同组合方式及位置的钢液流动行为、RTD曲线及夹杂物去除率进行分析,结果表明,在坝墙间距不变情况下,挡墙往长水口侧移动适当距离会延长钢液平均停留时间9.9~17.9 s、死区体积比例减小0.45~0.85个百分点、中间包低温区域减少,净化钢液的能力有所提升;在坝墙间距改变的情况下,坝墙间距过大可能会导致中间包浇注区钢液的紊乱,钢液平均停留时间延长不明显,死区体积比例反而增大0.33个百分点,中间包低温区域增大,夹杂物总去除率上升0.18个百分点。因此,坝墙间距为473.5 mm及挡墙与长水口距离为720 mm是较为理想的控流装置组合方式。采用优化方案后,中间包内钢液洁净度得到有效提升。The reasonable structure and layout of flow control devices are crucial for improving the cleanliness of molten steel within the tundish in the continuous casting process.A combined approach using numerical simulation and physical modeling was employed to analyze the steel flow behavior,residence time distribution(RTD)curves,and inclusions removal rates for different combinations and positions of flow control devices in a single-strand slab tundish at a certain plant.The results indicate that when the distance between the dam and baffle remains constant,a suitable shift of the baffle wall towards the ladle shroud side can prolong the average residence time of the liquid steel by 9.9 s to 17.9 s,reduce the dead zone volume fraction by 0.45 to 0.85 percentage,and decrease the low-temperature region in the tundish, thereby enhancing the purification capability of the molten steel. However, when thedistance between the dam and baffle is changed, an excessively large distance between them may causeturbulence in the casting zone of the tundish, with the average residence time of the steel showing nosignificant extension. Instead, the dead zone volume fraction increases by 0.33 percentage, leading to anenlargement of the low-temperature region in the tundish and a 0.18 percentage increase in the overallinclusion removal rate. Thus, a dam-to-dam distance of 473.5 mm and a baffle-to-ladle shroud distanceof 720 mm are considered to be the more ideal combination for flow control device settings. The steelcleanness in the single-strand tundish has been effectively enhance by applying the optimized flow controlscheme.

关 键 词：中间包 控流装置 数理模拟 RTD曲线 夹杂物去除 

分 类 号：TF777[冶金工程—钢铁冶金]