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Water Modeling on Circulating Flow and Mixing Time in a Ruhrstahl–Heraeus Vacuum Degasser

Steel research international(2021)

Wuhan Univ Sci & Technol | Yanshan Univ | Zhejiang Fash Inst Technol | Univ Sci & Technol Beijing USTB

Cited 5|Views13
Abstract
A physical water model based on the similarity principle is established to investigate the fluid flow and mixing phenomena during the Ruhrstahl–Heraeus (RH) steel refining process. The velocity distribution and the turbulent features on the center section are obtained using particle image velocimetry (PIV) measurement. Two vortexes between the down‐leg snorkel and the ladle sidewall are observed. The effects of the number of gas‐injection nozzles and the liquid levels in the vacuum chamber on the fluid phenomena are performed. More injected nozzles and a higher liquid level in the vacuum chamber generate larger velocity in the ladle. Twenty monitors in the ladle are used to monitor the variation of the conductivity to obtain the mixing time, indicating that the mixing time varies much with locations. The distribution of the mixing time on the vertical center section of the ladle is obtained. Moreover, the relationship between the circulation rate and the mixing time is obtained, indicating that the mixing time decreases with increasing circulation rate, and the slope of their relationship is −0.35.
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circulating flow,mixing time,Ruhrstahl-Heraeus reactor,water model
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要点】:本文通过物理水模型和粒子图像测速技术(PIV)研究了RH精炼过程中流体流动和混合现象,揭示了气体喷嘴数量和真空室内液位对流动特性的影响,并建立了循环速率与混合时间的关系。

方法】:利用相似性原理建立物理水模型,通过PIV测量获取中心截面的速度分布和湍流特性。

实验】:通过改变气体喷嘴数量和真空室内液位进行实验,使用20个导电性监测器监测混合时间,实验数据集名称未提及,得到了 ladle 垂直中心截面的混合时间分布和循环速率与混合时间的关系。