Proceedings of the Seminar on Steelmaking, Casting and Non-Ferrous Metallurgy

Title

EFFECT OF SUPERSONIC NOZZLE DESIGN ON JET BEHAVIOR IN BOF STEELMAKING

Authorship

Silveira, Débora Cardoso de Oliveira; Hamadeh, Hamzeh; Pastel, Kateryna; Huber, Jean-Christophe; Brosse, Guillaume

Silveira, Débora Cardoso de Oliveira

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Hamadeh, Hamzeh

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Pastel, Kateryna

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Huber, Jean-Christophe

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Brosse, Guillaume

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DOI

10.5151/2594-5300-33520

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Abstract

The dynamic behavior of oxygen gas flow, determined by the lance nozzle and blow pattern, is a key factor for determining jet efficiency in BOF Steelmaking. The present work compares the performances of Laval and parabolic nozzles with the aid of the Computational Fluid Dynamics (CFD). The Method of Characteristics (MOC) was applied to design a minimum length parabolic nozzle. The results show that the parabolic nozzle generates more uniform and stable jet, with 2% longer potential core and supersonic length and less shock waves. For the parabolic nozzle, the pressure nearby the nozzle wall is higher, which can protect this region from reverse flow of converter gases and offer longer life for the lance tip. Likewise, the flow rate variations would affect less this nozzle. In addition, the nozzle wear was investigated, and the parabolic nozzle has proven relatively less sensitivity to the presence of this deformity.

Keywords

Supersonic nozzle design; BOF; Numerical simulation; Method of Characteristics.