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Decarburization and Inclusion Removal Process in Single Snorkel Vacuum Degasser

机译：单通气管真空脱气机脱碳除杂物工艺

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摘要

In the current work, the coupled mathematical models for decarburization, fluid flow model and inclusion collision-aggregation model were solved to investigate the spatial distribution of carbon, inclusion's collision-aggregation and removal in a single snorkel vacuum refining furnace (SSF). The numerical results show that the turbulence kinetic energy of ladle in SSF is much greater than that in RH, which can shrink the dead zone and prompt the mixing in the ladle. The overall decarburization reaction rate can be described as a first-order reaction. On the condition of the same gas flow rate, the volumetric mass transfer coefficient for decarburization in SSF is almost twenty times bigger than that in RH, which leads to a much greater decarburization rate in SSF. The spatial distribution of carbon mass fraction in SSF is quite different from that in RH. There is the greater mass fraction of carbon at the recirculation zone under up-snorkel in RH, but this phenomenon disappears in SSF. The inclusion removal can be simplified as the mass transfer between liquid steel to slag, refractory wall and bubble surface. And the overall inclusion removal rate can be regarded as a first-order reaction. The volumetric mass transfer coefficient for inclusion removal in SSF is about three times,as,that in RH, the inclusion removal rate in SSF is greater than that in RH. The inclusions with different size have different removal rates in SSF. For inclusion flotation after deoxidization, the treatment time in SSF is less than that in RH.
机译：在目前的工作中，求解了脱碳，流体流动模型和夹杂物碰撞-聚集模型的耦合数学模型，以研究单个通气管真空精炼炉（SSF）中碳的空间分布，夹杂物的碰撞-聚集和清除。数值结果表明，钢包中的钢包湍流动能远大于RH中的钢包，这会缩小死区并促进钢包中的混合。整体脱碳反应速率可描述为一级反应。在相同的气体流量条件下，SSF中脱碳的体积传质系数几乎是RH的20倍，这导致SSF中的脱碳率大大提高。 SSF中碳质量分数的空间分布与RH中的差异很大。在RH的上呼吸管下，再循环区的碳质量分数更高，但这种现象在SSF中消失了。由于钢水到渣，耐火壁和气泡表面之间的传质可以简化夹杂物的去除。总的夹杂物去除率可以看作是一阶反应。 SSF中杂质去除的体积传质系数约为RH的3倍，SSF中杂质去除率大于RH。不同尺寸的夹杂物在SSF中具有不同的去除率。对于脱氧后的浮选，SSF的处理时间少于RH。

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  • 来源
    《High temperature materials and processes》 |2017年第5期|523-530|共8页
  • 作者

    Geng Dian-Qiao; Hong Lei; Ji-Cheng He;

  • 作者单位

    Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China, School of Metallurgy, Northeastern University, Shenyang 110819, China;

    Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China, School of Metallurgy, Northeastern University, Shenyang 110819, China;

    Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China, School of Metallurgy, Northeastern University, Shenyang 110819, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    decarburization; inclusion; bubble; SSF; RH;

    机译：脱碳包含气泡;SSF;相对湿度;

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