电磁制动对连铸器内钢水流场的影响及表面检测  

Effect of EMBr on Flow Field of Molten Steel in a Continuous Casting Mold and Its Surfacial Fluctuation Measurement

作　　者：吉传波[1] 李京社[1] 张同波[1] 程爱民[1] 唐海燕[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《过程工程学报》2013年第1期10-16,共7页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:51074021)

摘　　要：采用数值模拟与钢水表面插钉法,对电磁制动条件下薄板坯连铸结晶器内钢水流动进行研究,分析了不同磁场强度对结晶器内钢水流动及弯月面波动的影响.模拟结果表明,电磁制动能够明显抑制高速流动的钢水,减小对结晶器窄面的冲击及钢水表面卷渣的影响,磁场电流强度由180A增加到284A时,钢水表面速度最大值由无电磁制动的0.85m/s分别降低至0.5,0.16m/s.插钉法可作为一种经济有效的方法检测钢水表面速度,且测量值与模拟结果比较吻合.通过合理控制磁场电流强度约260A可以优化结晶器内钢水流动,进而改善铸坯质量.The computational model combined with nail dipping method was applied to study the effect of a local type electromagnetic brake （EMBr） on molten steel flow in a thin slab continuous casting mold. The surface flow velocity and meniscus fluctuation were analyzed at different locations of magnetic field and strength. The computational results showed that the magnetic force suppressed the high velocity exit from the nozzle ports and decreased the impingement to mold narrow face and slag entrapment. The maximum surface velocity decreased from 0.85 m/s without EMBr to 0.5 and 0.16 m/s when the EMBr current increased from 180 to 274 A. The nail dipping measurement was economic and effective for monitoring the surface velocity. Furthermore, the EMBr current intensity could be controlled to -260 A, which achieves to stabilize the fluid flow in the mold and thereby minimize casting defects of billets.

关 键 词：连铸 结晶器 插钉法 电磁制动 

分 类 号：TF777.1[冶金工程—钢铁冶金]