二冷电磁搅拌下板坯连铸机内流动和凝固行为

二冷电磁搅拌(S-EMS)是板坯连铸生产中重要的电磁冶金技术。采用数值模拟方法研究了二冷电磁搅拌对板坯连铸机内钢液流动和凝固的影响。数值结果表明,二冷区电磁辊产生的磁场主要集中在电磁辊附近。二冷电磁搅拌对结晶器钢液的流场影响不明显,对二冷区凝固坯壳的厚度影响也不明显。当上下两对电磁辊的电流方向相反时,二冷区流场呈三环式;当上下两对电磁辊的电流方向相反时,二冷区流场呈双蝶式。

Fluid flow and solidification in slab continuous caster with S-EMS

S-EMS (Strand Electro-Magnetic Stirrer) is one of the important electromagnetic metallurgy technologies in slab continuous casting.Numerical simulation is applied to study the effect of the S-EMS on the fluid flow and solidification of molten steel in the slab continuous caster.Numerical results show that, the magnetic field caused by the electromagnetic stirring is mainly concentrated near the electromagnetic roller. The electromagnetic stirring has no obvious effect on the fluid flow in the mold and slab shell thickness at secondary cooling segment. If the current direction of the upper and lower electromagnetic stirrer is opposite, the flow field is three-ring like mode. If the current direction of the upper and lower electromagnetic stirrer is the same, the flow field is ambi-butterfly mode.