电磁搅拌宽厚板结晶器内钢液流动和液面波动  

Effect of electromagnetic stirring position on liquid steel flow and liquid level fluctuation in continuous casting mold for wide-thick slab

作　　者：何建国 邓安元[1,2] 许秀杰[1,2] 王恩刚[1,2] HE Jian-guo;DENG An-yuan;XU Xiu-jie;WANG En-gang(Key Laboratory of Materials Electromagnetic Process Research,Ministry of Education,Northeastern University,Shenyang 110004,Liaoning,China;School of Metallurgy,Northeastern University,Shenyang 110004,Liaoning,China)

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110004 [2]东北大学冶金学院,辽宁沈阳110004

出　　处：《连铸》2022年第4期50-58,共9页Continuous Casting

基　　金：国家自然科学基金资助项目(51474065);高等学校学科创新引智计划资助项目2.0(BP0719037)。

摘　　要：为合理控制宽厚板结晶器内的钢液流动和液面波动,提高铸坯质量。通过数值模拟的方法研究了2 200 mm×250 mm连铸结晶器内的钢液流动和液面波动行为。考察了搅拌位置对流动和液面波动行为的影响规律。结果表明,电磁搅拌可增强上回流区域钢液流动,有利于均匀钢液成分和温度。电磁搅拌可使水口附近钢液的流速增加约0.04 m/s,增强了对水口附近钢液的搅拌。提高搅拌位置,搅拌产生的水平旋流增强了下返流流速,使熔池内下涡心位置上移。钢液的水平旋流使上返流发生偏转,减弱了上返流流速,降低了对液面的直接冲击,减小液面波动。适当提高电磁搅拌器位置有利于控制液面波动。电磁搅拌器中心位置Y=-0.1 m时,液面波动可由7.5 mm降低到3 mm以内,可减小液面卷渣,流场具有很好的对称性。To reasonably control the flow of liquid steel and the fluctuation of liquid level in the mold of wide-thick slab and improve the quality of slab.The flow and level fluctuation behavior of molten steel in a 2 200 mm×250 mm continuous casting mold was studied by numerical simulation.The effects of electromagnetic stirring position on the flow and liquid level fluctuation were investigated.The results show that the electromagnetic stirring can enhance the flow of molten steel in the upper reflux area,which is beneficial to uniform composition and temperature of molten steel.The electromagnetic stirring can increase the speed of the molten steel near the nozzle by about 0.04 m/s,and fully enhance the stirring of the molten steel near the nozzle.With the stirring position moving upward,the horizontal swirl flow generated by the electromagnetic stirring can enhance the speed of the downward flow,as a result the position of the lower vortex center in the molten pool moves up.The electromagnetic force promotes the horizontal flow of molten steel,which deflects the upward flow and weakens the speed of the upward flow which can reduce the impact of upward flow on the liquid level and the fluctuation of the liquid level.Raising the position of the electromagnetic stirrer is helpful to control the fluctuation of the liquid level.When the center position of the electromagnetic stirrer is Y=-0.1 m,the liquid level fluctuation can be reduced from 7.5 mm to less than 3 mm,which can reduce the occurrence of slag entrainment,and the flow field still maintains a good symmetry.

关 键 词：宽厚板 电磁搅拌 搅拌位置 液面波动 流场 

分 类 号：TF777[冶金工程—钢铁冶金]