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<p>In the Basic Oxygen furnace (BOF) process, the shielding flame of jets formed by combustion can significantly affect the flow behavior of multi-hole supersonic oxygen jets, thereby affecting the impact and stirring of the jets on the bath, and ultimately changing the smelting process. This study developed a numerical model to explore the effects of combustion on these jets, considering various nozzle angles, ambient temperatures, and oxygen pressures. Results show that combustion occurs at the jet boundary notably affects the jet behavior, as well as the temperature and gas distribution. It was found the jet independence was enhanced and velocity attenuation was suppressed, showing a 59 pct increase in maximum jet velocity and a 60 pct reduction in jet trajectory offset at a lance height of 2 m. Compared to the jet without combustion, the combustion causes a deviation of 0.06 to 0.07 m from the oxygen lance axis when the nozzle angles in the range of 15.5 to 17.5 deg. Additionally, the maximum velocity of the jet increases by 64, 59, and 55 pct at pressures of 0.78, 0.88 MPa, and 0.98 MPa, respectively. While ambient temperatures between 1300&#xa0;°C and 1600&#xa0;°C do not significantly affect jet coalescence.</p>

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Evaluation of Multi-hole Supersonic Oxygen Jets Behaviors with Combustion in a BOF Converter: Toward a Numerical Simulation

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Yu Zhang,
  • Guoqing Chen,
  • Qiang Yue,
  • Xiaobin Zhou

摘要

In the Basic Oxygen furnace (BOF) process, the shielding flame of jets formed by combustion can significantly affect the flow behavior of multi-hole supersonic oxygen jets, thereby affecting the impact and stirring of the jets on the bath, and ultimately changing the smelting process. This study developed a numerical model to explore the effects of combustion on these jets, considering various nozzle angles, ambient temperatures, and oxygen pressures. Results show that combustion occurs at the jet boundary notably affects the jet behavior, as well as the temperature and gas distribution. It was found the jet independence was enhanced and velocity attenuation was suppressed, showing a 59 pct increase in maximum jet velocity and a 60 pct reduction in jet trajectory offset at a lance height of 2 m. Compared to the jet without combustion, the combustion causes a deviation of 0.06 to 0.07 m from the oxygen lance axis when the nozzle angles in the range of 15.5 to 17.5 deg. Additionally, the maximum velocity of the jet increases by 64, 59, and 55 pct at pressures of 0.78, 0.88 MPa, and 0.98 MPa, respectively. While ambient temperatures between 1300 °C and 1600 °C do not significantly affect jet coalescence.