立式电磁制动对不同水口角度下连铸结晶器内流场的控制

Control of V-EMBr on flow field in continuous casting mold with different angle of SEN

利用Fluent软件模拟计算了常规板坯连铸和立式电磁制动板坯连铸过程,详细研究了不同水口出口角度结晶器内三维流场,为评价立式电磁制动技术的冶金效果提供理论依据.研究表明:常规连铸过程水口出口角度增加时,不利于夹杂物的上浮,影响铸坯质量;不同水口出口角度连铸过程应用立式电磁制动技术后,自由表面钢液流速、钢液主射流的运动速度和下回流区的冲击深度显著减小,利于稳定液面波动、减少卷渣、防止漏钢和促进夹杂物的上浮,符合立式电磁制动技术的设计思想.

The slab continuous casting process without and with V- EMBr（ Vertical- Electromagnetic Brake） are simulated by software Fluent,and the three- dimensional flow field in mold with different outlet angle of SEN（ Submerged Entry Nozzle） are studied in detail,which provide a theoretical basis to evaluate the metallurgical effect of V- EMBr. The studies showthat when outlet angle of SEN is increased in continuous casting process,it is very unfavorable to float inclusions and the quality of slab is affected. After using the V- EMBr in continuous casting process with different outlet angle of SEN,the molten steel velocity of free surface,the flow velocity of jet and the impinging depth in lower recirculation zone are decreased significantly,these are beneficial to stabilize the level fluctuations,reduce slag,prevent breakout and promote inclusions floating,which conform the design philosophy of V- EMBr technology.