摘要
A validated numerical model was established to simulate gas−liquid flow behaviors in the oxygen-enriched side-blown bath furnace.This model included the slip velocity between phases and the gas thermal expansion effect.Its modeling results were verified with theoretical correlations and experiments,and the nozzle-eroded states in practice were also involved in the analysis.Through comparison,it is confirmed that the thermal expansion effect influences the flow pattern significantly,which may lead to the backward motion of airflow and create a potential risk to production safety.Consequently,the influences of air injection velocity and furnace width on airflow behavior were investigated to provide operating and design guidance.It is found that the thin layer melt,which avoids high-rate oxygen airflow eroding nozzles,shrinks as the injection velocity increases,but safety can be guaranteed when the velocity ranges from 175 to 275 m/s.Moreover,the isoline patterns and heights of thin layers change slightly when the furnace width increases from 2.2 to 2.8 m,indicating that the furnace width shows a limited influence on production safety.
建立并验证一种能够较好模拟富氧侧吹熔池熔炼炉中气−液两相流动行为的数值模型,该模型包含两相滑移速度及气体热膨胀效应。利用多个理论关联式和实验结果验证数值模拟结果的准确性,并结合生产实践中喷嘴的侵蚀状态进行分析。通过对比,证明气体的热膨胀效应对两相流动过程影响显著,且可能会导致气流出现后座现象并对生产安全造成潜在风险。为此,进一步分析气流喷吹速度和炉体宽度对气流行为的影响,为富氧侧吹炉的操作制度和结构设计提供指导。研究发现,气流喷吹速度的提升,会致使防止富氧气流蚀损喷嘴的薄层熔体逐渐减少,但气流速度在175~275 m/s时仍可以保证生产安全。此外,炉体宽度从2.2 m提升至2.8 m时,薄层熔体在形状和高度上的变化较小,其对生产的安全性影响有限。
基金
the support from the National Key R&D Program of China(No.2018YFC1901606).
