Numerical simulation of recirculating flow and physical model of slag–metal behavior in an RH reactor : application to desulfurization.
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2018
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Computational fluid dynamics (CFD) techniques and a 1:7.5 physical model of an RH degasser
have been used to evaluate the flow of gas and metal inside an RH reactor for vacuum degassing
of liquid steel. The effect of gas injection on the gas spatial distribution, steel circulation rate and
flow field inside the ladle, snorkels and vacuum chamber have been assessed. N-pentane oil was
employed to evaluate the average residence time as well as the slag droplet size distribution. The
predicted radial gas distribution and liquid circulation rate have been validated against
experimental data from a physical model. The results with incorporation of the virtual mass
force coefficient of 0.25 and the turbulence dispersion force showed better predictions of gas
distribution in the up-snorkel as well as circulation rate. Full-scale simulations were performed,
and the predicted circulation rate was significantly affected by the argon bubble expansion. Data
from these simulations were used to analyze the degree of desulfurization performed by the
addition of desulfurizing agents inside the vacuum chamber. A model of the kinetics of
desulfurization based on the results from the physical model and CFD simulation and on slag
dispersion inside liquid steel yields degrees of desulfurization similar to the industrial trials
reported in the literature.
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PEIXOTO, J. J. M. et al. Numerical simulation of recirculating flow and physical model of slag–metal behavior in an RH reactor : application to desulfurization. Metallurgical and Materials Transactions B-Process Metallurgy and Materials Processing Science, v. 49, p. 2421-2436, dez. 2018. Disponível em: <https://link.springer.com/article/10.1007/s11663-018-1355-z>. Acesso em: 13 fev. 2019.