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Effects of Nozzle Layout and Parameters on the Jet Characteristics of a CO2 + O2 Mixed Oxygen Lance

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Abstract

The application of CO2 for converter steelmaking results in several beneficial effects. However, limited studies have investigated the influence of CO2 and O2 mixed injection on jet flow field and whether jet characteristics can be improved by changing the layout of nozzle holes. This study used FLUENT® to simulate the jet distribution of the oxygen lance nozzle of a 120 t converter. First, the model was verified; then, the influences of nozzle center opening area and injection flow rate on the jet characteristics of the main blowing hole were simulated and analyzed. At the same distance, a larger central hole and injection flow rate corresponded to a greater jet axial velocity from the main blowing hole and larger area of impact from the jet onto a molten pool. However, the jet turbulent kinetic energy of the nozzle axis increases with the size of the central hole and injection flow rate; meanwhile, the offset angle of the actual axial velocity of the jet increases, and the coalescence point of each jet advances. The results obtained can serve as reference for the design and optimization of an oxygen lance nozzle for the mixed injection of CO2 + O2 in converter steelmaking.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (NO.51334001, NO.51574021 and NO.51734003), the Fundamental Research Funds for the Central Universities (FRF-TP-19-031A1), the China Post Postdoctoral Science Foundation (2019M660459), the China Post Postdoctoral Science Foundation (2020T130053).

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Correspondence to Kai Dong or Guangsheng Wei.

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Manuscript submitted August 21, 2020; accepted November 27, 2020.

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Feng, C., Zhu, R., Dong, K. et al. Effects of Nozzle Layout and Parameters on the Jet Characteristics of a CO2 + O2 Mixed Oxygen Lance. Metall Mater Trans B 52, 425–439 (2021). https://doi.org/10.1007/s11663-020-02048-8

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  • DOI: https://doi.org/10.1007/s11663-020-02048-8

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