气幕挡墙对中间包流场和夹杂物去除的影响

为了减轻高钛含量下钢水连铸过程夹杂物产生的不利影响，建立了中间包流场、夹杂物运动及去除模型，考虑了气泡对夹杂物的吸附，重点研究了气幕挡墙及其安装位置对流场和夹杂物的影响。结果表明，小粒径颗粒在钢水带动下跟随性好，且自身浮力小，在无吹气情况下，1～10μm粒径的夹杂物去除率较低。当吹气流量为5 L/min时，Al₂O₃和TiN夹杂物的去除率均明显提高，在粒径范围1～10μm内，Al₂O₃的去除率为21.7%～34.6%,TiN的去除率为22.7%～33.14%。当气幕挡墙位于湍流抑制器和上挡墙之间时，由于钢液形成的回流速度大，夹杂物和气泡碰撞的概率增加，进而被气泡捕获的概率增加，更有利于夹杂物的去除。本研究为高钛钢连铸过程夹杂物去除提供了理论指导。

Effect of gas curtain in tundish on flow field and inclusions removal

To eliminate the adverse effect resulting from inclusions formed during the continuous casting of high-Ti steel, this study considered the influence of gas adsorption on inclusions, built the numerical model of the flow field and inclusions motion and removal within tundish, and discussed the influence of gas curtain and its location on the flow and inclusion removal. The main results show that as particles with small sizes had good following ability driven by molten steel, and low buoyancy, the removal rate of particles in the 1-10 μm range was almost zero under traditional tundish. After applying the gas curtain with 5 L/min gas flow rate, the removal rates for both Al₂O₃ and TiN were enhanced obviously, 21.7%-34.6% for Al₂O₃ particles and 22.7%-33.14% for TiN particles in the range of 1-10 μm. When the gas curtain was located between the turbulence inhibitor and the up-dam, the flow speed of steel circulation became larger, to increase the probability of inclusion collision with bubbles. Thus, the probability of inclusions being captured by bubble increased, which was more conducive to inclusion removal. The current study can provide theoretical guidance for inclusion removal in the continuous casting of high-Ti steel.