20t 3流T形中间包流场优化  

Optimization on the flow distribution of 20 t three strand T shape tundish

作　　者：赵冠夫 

机构地区：[1]山东钢铁股份有限公司莱芜分公司特钢事业部,山东莱芜271104

出　　处：《炼钢》2015年第2期17-20,25,共5页Steelmaking

摘　　要：依据相似原理利用水模型试验测定了20 t 3流T形中间包不同试验方案下的RTD曲线,通过分析各方案的RTD曲线和混合模型计算结果,得出中间包挡墙最佳优化方案;优化后中间包钢液混匀时间由近250 s降低至约100 s,平均停留时间由500 s以上提高到1 000 s以上,包内死区体积比由近60%降至约20%,实测各流钢液温度差由5.33℃降至1.17℃,50μm以上铸坯大型夹杂物均不超过6.5 mg/10 kg;钢中小粒径夹杂物尺寸基本不超过6μm。生产实践表明,中间包新挡墙设置有利于均匀钢液温度以及增大夹杂物碰撞上浮去除的几率。Based on the similarity principle, RTD curves of different testing schemes were investigated in 20 t three strand T shape tundish by using water model test. By analyzing of the scheme of RTD curves and the mixed model calculation results, the best opti- mization solution was concluded for the tundish retaining wall. After the flow optimiza- tion, mixing evenly time of liquid steel decreased from nearly 250 s to about 100 s, mean residence time increased from 500 s to 1 000 s, package dead volume decreased from nearly 60 % to about 20 %, every flow liquid steel temperature difference decreased from 5.33℃ to 1.17 ℃. The large inclusions （more than 50/lm） was not more than 6. 5 mg/10 kg in slab, the small diameter inclusion size was less than 6μm in steel. The production practice shows that the new tundish retaining wall is beneficial to the uni- form temperature of molten steel and the probability of collision removal rate of inclusions.

关 键 词：中间包 水模试验 钢水流场 优化 

分 类 号：TF777[冶金工程—钢铁冶金]