摘要
圆坯广泛用于风力发电、石油化工和机械制造等领域,然而夹杂物问题是大圆坯连铸的瓶颈,制约了大圆坯产品质量的进一步提高。为了提升夹杂物去除率,提出了一种三孔旋流水口,基于大涡模拟方法建立了圆坯结晶器三维瞬态数学模型,采用VOF方法描述渣-金界面的波动情况,研究了浸入式水口结构对结晶器流场的影响。研究结果发现,在使用旋流水口的情况下,结晶器上部存在许多不同尺度的漩涡,流场分布较为均匀,渣-金界面处波动平稳,速度在0.1 m/s左右。然而,在采用直通水口的情况下,结晶器上部流场速度很小,渣-金界面波动基本停滞,不利于化渣。此外,由于直通式水口射流深度较深,夹杂物不易上浮,夹杂物去除率只有2.05%。旋流水口射流深度较浅,在钢液中形成的环形流动可以有效地促进夹杂物上浮至渣-金界面,因此夹杂物去除率较高,达到了10.52%。综上,三孔旋流水口改善了钢液流动状态,活跃了渣-金界面,有利于净化钢液,对大圆坯生产具有一定借鉴意义。
Round billets are widely used in the fields of wind power generation,petrochemical industry and machinery manufacturing.However,the problem of inclusions is the bottleneck of continuous casting of large round billets,which restricts the further improvement of the quality of large round billets.In order to improve the removal rate of inclusions,a three-hole swirl nozzle was proposed.Based on the large eddy simulation method,a three-dimensional transient mathematical model of the round billet mold was established,and the VOF method was used to describe the fluctuation of the slag-gold interface.The influence of the nozzle structure on the flow field of the crystallizer was studied.The research results show that when the swirl nozzle is used,there are many vortices of different scales in the upper part of the mold,the flow field distribution is relatively uniform,the fluctuation at the slag-gold interface is stable,and the speed is about 0.1 m/s.However,when the straight nozzle is used,the velocity of the flow field in the upper part of the mold is very small,and the fluctuation of the slag-gold interface is basically stagnant,which is not conducive to slag removal.In addition,due to the deep jet depth of the straight-through nozzle,the inclusions are not easy to float,and the inclusion removal rate is only 2.05%.The jet depth of the swirl nozzle is shallow,and the annular flow formed in the molten steel can effectively promote the inclusions to float up to the slag-gold interface,so the inclusion removal rate is high,reaching 10.52%.In summary,the three-hole swirl nozzle improves the flow state of molten steel,activates the slag-gold interface,and is beneficial to purifying molten steel,which has certain reference significance for the production of large round billets.
作者
张志霄
韩蕾蕾
李向龙
张佩
屈天鹏
王德永
ZHANG Zhixiao;HAN Leilei;LI Xianglong;ZHANG Pei;QU Tianpeng;WANG Deyong(Shagang School of Iron and Steel,Soochow University,Jiangsu 215137,Suzhou,China;Steelmaking Technique Center,Shandong Iron and Steel Group Company Limited,Jinan 271104,Shandong,China)
出处
《连铸》
2023年第4期48-54,共7页
Continuous Casting
基金
国家自然科学基金资助项目(52174321,51874203)
张家港市产学研基金资助项目(ZKCXY2133)。
关键词
旋流水口
圆坯
大涡模拟
流场均匀性
液面波动
swirl nozzle
round billet
large eddy simulation
flow field uniformity
liquid level fluctuation
