The influence of flow asymmetry on refractory erosion in the vacuum chamber of a RH degasser.
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2019
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Nozzle blockage in RH reactors is a serious operational problem since it can cause an asymmetric distribution of the steel flow in both the up-leg as well as the lower region of the
vacuum chamber. This anomaly can alter the circulation rate in addition to affecting the
erosion profile of the lower part of vacuum chamber refractory lining. In this study, the
effect of nozzle obstruction on liquid circulation rate, wall shear stress, velocity profiles and
flow pattern have been evaluated. In addition, refractory erosion in the vacuum chamber
has been estimated through physical modeling and mathematical simulation results. Four
blockage conditions were studied for different gas flow rates. There was a good agreement
in physical and mathematical models results. Asymmetric flow was observed in vacuum
chamber lower region in asymmetric blockage cases, which resulted in preferential wear
on one chamber side in physical modeling experiments. The wall shear stress analysis in
the vacuum chamber using a fluid dynamic model also indicates preferential erosion. When
compared, refractory erosion results in physical modeling and shear stress in mathematical
modeling presented good correlation.
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MELO, P. H. R. V. de et al. The influence of flow asymmetry on refractory erosion in the vacuum chamber of a RH degasser. Journal of Materials Research and Technology, v. 8, n. 5, p. 3764-3771, set./out. 2019. Disponível em: <https://www.sciencedirect.com/science/article/pii/S2238785419301590>. Acesso em: 10 mar. 2020.