Modelling Effect of Circulation Flow Rate on Inclusion Removal in RH Degasser

Based on the similarity principles, a 1 ： 7 scale physical model was established to study the behavior of molten steel flow and inclusion removal in a 145 t Rheinsahl-Heraeus （RH） degasser. On the basis of the quantitative measurements of the circulation flow rate and inclusion removal under various...

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Bibliographic Details
Published in:Journal of iron and steel research, international international, 2016-12, Vol.23 (12), p.1243-1248
Main Authors: ZHENG, Shu-guo, ZHU, Miao-yong
Format: Article
Language:English
Subjects:
Applied and Technical Physics
circulation flow rate
Engineering
inclusion removal
lifting gas flow rate
Machines
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
Metallurgy and Metal Working
Physical Chemistry
physical modelling
Processes
RH degasser
RH精炼
夹杂物去除
循环流率
循环流速
循环流量
模拟
湍流扩散
钢液流动
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Summary:Based on the similarity principles, a 1 ： 7 scale physical model was established to study the behavior of molten steel flow and inclusion removal in a 145 t Rheinsahl-Heraeus （RH） degasser. On the basis of the quantitative measurements of the circulation flow rate and inclusion removal under various lifting gas flow rates, the effect of circulation flow rate on inclusion removal was investigated in the RH degasser. The inclusion removal rate shows the trend of first increase and then decrease twice with increasing the circulation flow rate when the circulation flow rates are smaller than 104.7 L/min. Whereas, the inclusion removal rate increases again with the further increase in circu- lation flow rate when the circulation flow rate is larger than 104.7 L/min. At lower circulation flow rates, inclusions are mainly removed by Stokes flotation to the slag/steel interface after inclusions are transferred near the slag/steel interface by the circulation flow. At higher circulation flow rates, the collision and aggregation of inclusions improves the inclusion removal efficiency. With the further increase in the circulation flow rate, inclusions are mainly removed by following the turbulent fluctuation （turbulent diffusion） to the slag/steel interface after inclusions are transferred near the slag/steel interface by the circulation flow.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(16)30183-2