气幕挡墙技术优化双流中间包流场的物理模拟  

Physical modelling on optimization of flow behaviors in a two-strand tundish by gas curtain

作　　者：田宝生 方庆 王家辉 武献民 霍立桥 张华[2] TIAN Bao-sheng;FANG Qing;WANG Jia-hui;WU Xian-min;HUO Li-qiao;ZHANG Hua(Hebei Hot Rolled Plate and Strip Technology Innovation Center,Xingtai 054009,Hebei,China;Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)

机构地区：[1]河北省热轧板带钢技术创新中心,河北邢台054009 [2]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《连铸》2023年第2期19-27,共9页Continuous Casting

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)。

摘　　要：合理的气幕挡墙安装位置和吹气量是提升中间包内钢液洁净度的关键。以某厂双流板坯中间包为研究对象,利用水模型试验对中间包装备气幕挡墙前后的流场和RTD曲线进行了分析,并对比研究了安装位置和吹气量对中间包流场的影响。结果表明,中间包装备气幕挡墙后,钢液的平均停留时间无明显变化,死区体积比由14.58%减小至5.32%,有利于钢液的混匀。气幕挡墙的安装位置和气量对中间包死区体积比例有显著影响,但对平均停留时间的影响较小。最优的安装位置为距离浸入式水口500 mm,死区体积比例为5.32%,相较于距离为600 mm、700 mm和800 mm的死区体积比例分别减小了1.66%、1.62%和0.87%;最优的吹气量为0.4 m^(3)/h,相较于吹气量为0.5 m^(3)/h和0.6 m^(3)/h,死区体积比例分别减少了2.8%和1.11%。采用气幕挡墙后,铸坯的总氧均值和单类夹杂物1.0级以上比例分别下降了9.5%和20%以上。The installation position and gas blowing rate of gas curtain are the key parameters to improve cleanliness of molten steel in tundish.Taking a double-flow slab tundish as the research object,the flow field and residence time distribution(RTD)curves in a two-stand slab tundish of a steelmaking plant with and without gas curtain were analyzed by water model experiments,and the effects of installation position and gas blowing rate on flow behaviors in the tundish were comparatively investigated.The results showed that after the tundish was equipped with gas curtain,the average residence time of molten steel appears no significant change,while the dead zone volume fraction decreases from 14.58%to 5.32%,which is beneficial to the mixing of molten steel.The installation position and gas blowing rate of gas curtain has a significant effect on the dead zone volume fraction of the tundish,but have less effect on the average residence time.The optimal installation position for the gas curtain is 500 mm away from the submerged entry nozzle(SEN),by which the dead zone volume faction is 5.32%,compared to the cases of 600 mm,700 mm and 800 mm away from the SEN,the dead zone volume fraction is reduced by 1.66%,1.62%and 0.87%,respectively.The optimal gas blowing rate is 0.4 m^(3)/h,compared to the cases with gas blowing rate of 0.5 m^(3)/h and 0.6 m^(3)/h,the dead zone volume fraction is reduced by 2.8%and 1.11%,respectively.The mean value of total oxygen and the proportion of single class inclusions above grade 1.0 decreased by 9.5%and over 20%,respectively.

关 键 词：中间包 气幕挡墙 水模型试验 RTD曲线 死区体积比 

分 类 号：TF777[冶金工程—钢铁冶金]