摘要
紧凑型带钢(CSP)薄板坯连铸结晶器在浸入式水口下方设置水平式的全幅一段电磁制动器(Ruler-EMBr),在进一步提高薄板坯连铸拉坯速度的情况下,不能有效控制CSP结晶器自由表面的钢液流速和液面的稳定性。为此提出一种新型的立式组合电磁制动(VC-EMBr)技术,并利用商业软件ANSYS FLUENT数值模拟研究了全幅一段电磁制动和立式组合电磁制动作用下CSP结晶器内钢液流动和浸入式水口结瘤造成结晶器内钢液偏流的控制效果。研究结果表明,立式组合电磁制动在CSP结晶器宽面形成总体呈"凹"型分布的稳态磁场,在保持全幅一段电磁制动水平磁极电磁特征和对结晶器内下返流流动和偏流的有效控制作用的前提下,同时在结晶器窄面的水口出流钢液冲击区和弯月面波动区域形成磁感应强度达0.26 T的立式稳态磁场,可有效控制结晶器窄面区域上返流流动,降低钢液自由表面的流速;采用立式组合电磁制动,使CSP结晶器内钢液自由表面的流速控制在合理范围之内,结晶器整个自由液面的流速分布更加均匀。VC-EMBr克服了全幅一段电磁制动装置对CSP结晶器上返流和自由液面流速控制不足的弊端,为进一步提高薄板坯连铸的拉坯速度提供新的技术措施。
In compact strip steel(CSP) thin slab continuous casting mold, only a horizontal full-width electromagnetic brake(Ruler-EMBr) is installed under the submerged entry nozzles. In the case of further increasing CSP casting speed, Ruler-EMBr cannot effectively control the flow rate of molten steel and the stability of liquid level in the CSP mold. Therefore, a new type of vertical combined electromagnetic braking technology(VC-EMBr) was proposed in this paper. The control effect of VC-EMBr and Ruler-EMBr on the conventional molten steel flow and the bias flow caused by clogging of submerged entry nozzles in the CSP mold were numerically simulated with the commercial software ANSYS FLUENT. The research results show that, when applied the VC-EMBr, an overall "concave" distribution of steady-state magnetic field is formed on the wide sides of CSP mold. Under the premise of maintaining electromagnetic characteristics and effective control to downward flow and bias flow in the mold of horizontal magnetic poles in Ruler-EMBr, and a vertical steady-state magnetic field with a magnetic induction intensity of 0.26 T is formed in the impact area of molten steel from SEN and the fluctuation area at the meniscus near narrow sides of mold, it can effectively control the upward flow of molten on the narrow sides of mold and decrease the flow rate of free surface for molten steel. So that with the VC-EMBr, the flow velocity of molten steel on the free surface of CSP mold is controlled in a reasonable range, and the velocity distribution of entire free surface in CSP mold is more uniform. VC-EMBr overcomes the insufficient control of Ruler-EMBr to upward flow and surface velocity of molten steel in CSP mold, and it can provide a new technical measure to further increase the drawing speed of thin slab continuous casting.
作者
张然
许琳
韩泽峰
董王子
王恩刚
ZHANG Ran;XU Lin;HAN Ze-feng;DONG Wang-zi;WANG En-gang(Key Laboratory of Electromagnetic Processes of Materials Ministry of Education,Northeastern University,Shenyang 110819,Liaoning,China;School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China)
出处
《中国冶金》
CAS
北大核心
2022年第1期44-51,共8页
China Metallurgy
基金
国家自然科学基金资助项目(U1760206,51574083)
国家111计划(2.0)资助项目(BP0719037)。
关键词
电磁制动
CSP薄板坯连铸
钢液流动
偏流
结晶器
立式组合电磁制动
电磁冶金
electromagnetic brake
CSP thin slab continuous casting
flow of molten steel
bias flow
mold
vertical combined electromagnetic braking
electromagnetic metallurgy
