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<p>The CFD-PBM model (Euler–Euler model coupled with a population balance model) is proposed in this study. A mathematical framework based on the coupled CFD-PBM decarburization process is established, considering decarburization reactions at three primary locations: the surface of the Ar bubbles, the free surface of the vacuum chamber, and the steel interior. The effect of bubble behavior on the decarburization process is anlayzed. The results show that the predicted carbon concentration over time by the CFD-PBM model is in good agreement with the in situ on-site measurements and more accurate compared to those without bubble dynamics considerations. The number density of small bubbles in the degasser increases by 2.5 and 4.8&#xa0;pct, the “Refining Time” at the monitor point decreases by 5.9 and 8.3&#xa0;pct with the gas flow rates increase to 3000 and 3500 NL/min, respectively. A gas flow rate of 3000 NL/min is found to be an optimal choice of operation from an economic perspective. At the gas flow rate of 3000 NL/min, small bubbles are formed in the snorkel due to bubble breakage, and its corresponding interfacial area is significantly enhanced by 26.2&#xa0;pct.</p>

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Numerical Study on the Decarburization Processes in Vacuum-Refining Degasser Using the Population Balance Method

  • 期刊论文

  • 发表日期：

    2025年1月14日

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  • Fengsheng Qi,
  • Nan Ye,
  • Zhongqiu Liu,
  • Sherman C. P. Cheung,
  • Baokuan Li

摘要

The CFD-PBM model (Euler–Euler model coupled with a population balance model) is proposed in this study. A mathematical framework based on the coupled CFD-PBM decarburization process is established, considering decarburization reactions at three primary locations: the surface of the Ar bubbles, the free surface of the vacuum chamber, and the steel interior. The effect of bubble behavior on the decarburization process is anlayzed. The results show that the predicted carbon concentration over time by the CFD-PBM model is in good agreement with the in situ on-site measurements and more accurate compared to those without bubble dynamics considerations. The number density of small bubbles in the degasser increases by 2.5 and 4.8 pct, the “Refining Time” at the monitor point decreases by 5.9 and 8.3 pct with the gas flow rates increase to 3000 and 3500 NL/min, respectively. A gas flow rate of 3000 NL/min is found to be an optimal choice of operation from an economic perspective. At the gas flow rate of 3000 NL/min, small bubbles are formed in the snorkel due to bubble breakage, and its corresponding interfacial area is significantly enhanced by 26.2 pct.