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    • 中间包内钢液流动和二次氧化的数值模拟

    CHEN Hongliang,LIU Zhentong,ZHOU Qiuyue,BA Juntao,CHEN Wei,ZHANG Lifeng

    China Metallurgy（2023）

    燕山大学 | 北京科技大学 | 燕山大学材料科学与工程学院 | 北方工业大学

    Cited 0|Views9
    Abstract
    由于目前关于铸锭中间包内钢液二次氧化过程仍然缺乏深入研究,对某厂实际生产303 t铸锭过程中真空脱气精炼(Vacuum Degassing Refining,VD)过程以及中间包内钢液进行取样,分析了钢中总氧(TO)和总氮(TN)含量的变化以及夹杂物成分、数量和尺寸的变化.结果表明,由于大铸锭浇注过程没有进行保护浇注,导致中间包内钢液的 TO 和TN质量分数较精炼结束分别增加了 5.59×10-6和9.08×10-6.二次氧化后,夹杂物的数密度增加了近4倍,夹杂物也由液态的钙铝酸盐向A12O3转变,降低了钙处理效果.数值模拟得到浇注时中间包钢液面卷入空气的平均速率为4.2×10-5 kg/s,圆形中间包较深的液位导致中间包进出口温差达到3.9 K.二次氧化后,在注流区的TO质量分数较高,而在右侧循环流区域和靠近底部区域质量分数较低,TO的平均质量分数和最大质量分数分别为28.6×10-6和45.3×10-6;CaO和Al2O3的平均质量分数分别为20.9×10-6和32.3 × 10-6.研究结果为优化中间包浇注过程中钢液二次氧化问题提供理论指导.
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    Key words
    heavy ingot tundish,multiphase flow,reoxidation,inclusion composition,spatial distribution
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    【要点】：本论文通过实际生产数据，研究了铸锭中间包内钢液的二次氧化过程，揭示了VD精炼后钢液TO和TN含量的变化及夹杂物特征，为优化浇注过程提供了理论指导。
    

    【方法】：通过实际取样分析，结合数值模拟方法研究了钢液在中间包内的流动与二次氧化情况。
    

    【实验】：实验在一家工厂的303 t铸锭生产中进行，取样分析了VD精炼前后以及中间包内钢液的总氧、总氮含量和夹杂物，使用数据集分析了成分、数量和尺寸的变化。结果显示，浇注过程中钢液面卷入空气，导致夹杂物数密度增加和成分转变，影响了钙处理效果。数值模拟揭示了中间包内钢液流动和温度分布，以及二次氧化后各区域的TO和氧化物质量分数差异。