五流大方坯中间包流场优化  

Flow field optimization of five strand bloom tundish

作　　者：张华[1] 罗荣华[1] 倪红卫[1] 李熠[1] 

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

出　　处：《武汉科技大学学报》2010年第5期486-491,共6页Journal of Wuhan University of Science and Technology

摘　　要：针对某钢厂五流大方坯中间包3流铸坯探伤不合格率较高的问题,采用数值模拟方法,研究不同结构中间包钢液的流场。结果表明,该钢厂现使用的中间包结构不合理,近流有短路流出现,且各流差异较大,不利于去除钢液中的夹杂物和提高各流间钢液的均匀性;采用大冲击区,挡墙中墙不开孔、侧墙开4个孔,设置2个坝的中间包结构最佳;中间包结构优化后,消除了近流的短路流,中间包钢液平均停留时间达652.9 s,各流示踪剂浓度的标准差仅为0.011 9,死区体积分数也仅为21.96%,既有利于夹杂物上浮去除,也保证了各流间钢液的均匀性。To tackle the high percentage of disqualification found in the flaw detection of a five strand bloom tundish at a steel mill,mathematical simulation method was employed to research the influence of tundish structure on molten steel flow.The research results show as follows：（1） The structure at present is disqualified and there is short circuit flow in the near strand with a quite big difference between strands,which is an obstacle to the removal of inclusions and improvement of the homogeneity of steel;（2） Adapting large impact zone with no holes in the middle wall,4 holes in the side wall and 2 dams in the tundish is the best scheme;（3） After the optimization,short circuit flow in the near strand is eliminated;the average residence time of tundish is 652.9 s;the standard deviation between each strand is only 0.0119;and the rate of dead space in tundish is 21.96%.The improvement can effectively promote the removal of inclusions and guarantee the homogeneity of steel in each strand.

关 键 词：中间包 数值模拟 流场 RTD曲线 

分 类 号：TF777.2[冶金工程—钢铁冶金]