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<p>In the current study, a comprehensive kinetic model was developed to predict the desulfurization of the molten steel during RH steel refining process, coupling the three-dimensional fluid flow. A user-defined scalar Eulerian-Eulerian model was used for this purpose, through which desulfurizer particles was considered a continuous phase so that the concentration of desulfurizer particles was calculated in the steel flow field. The desulfurization simulation was achieved through the interaction user-defined function between the desulfurizer phase and the molten steel phase, which was related to the size, the sulfur capacity and the mass transfer coefficient of desulfurizer particles. The model was validated by actual industrial trial data. The motion of desulfurizer particles with a 0.1&#xa0;mm diameter was influenced by eddy currents and they moved toward the down-leg side and accumulated on the right side of the ladle. Larger particles with a 30&#xa0;mm diameter remained at the surface of vacuum chamber due to their big buoyancy. Smaller particles had a larger desulfurization efficiency due to their bigger contact area with the molten steel, showing a rapid decrease of the sulfur content while a quick sulfur saturation due to their small volume. Larger particles maintained a longer desulfurization duration due to their bigger volume and big sulfur capacity as well. With a same injection rate, the total desulfurizer amount only influenced the final sulfur content and hardly influence the average desulfurization rate during the desulfurizer injection. The average desulfurization rate was influenced by the injection rate. The maximum desulfurization rate of 0.093&#xa0;ppm/s was obtained with a 150&#xa0;kg/min flow rate of the desulfurizer injection. Lowering lance position improved desulfurization efficiency and reduced final sulfur content as well. A regression formula was derived to quantitatively describe the effects of the size, the injection amount, the injection flow rate of desulfurizer particles, and lance position on the desulfurization rate, which can be used to predict sulfur variations in the molten steel during RH refining process.</p>

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Mathematical Modeling on Desulfurization During RH Steel Refining Process Using a Eulerian-Eulerian User-Defined Scalar Model

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Yu Sun,
  • Wei Chen,
  • Ying Ren,
  • Lifeng Zhang

摘要

In the current study, a comprehensive kinetic model was developed to predict the desulfurization of the molten steel during RH steel refining process, coupling the three-dimensional fluid flow. A user-defined scalar Eulerian-Eulerian model was used for this purpose, through which desulfurizer particles was considered a continuous phase so that the concentration of desulfurizer particles was calculated in the steel flow field. The desulfurization simulation was achieved through the interaction user-defined function between the desulfurizer phase and the molten steel phase, which was related to the size, the sulfur capacity and the mass transfer coefficient of desulfurizer particles. The model was validated by actual industrial trial data. The motion of desulfurizer particles with a 0.1 mm diameter was influenced by eddy currents and they moved toward the down-leg side and accumulated on the right side of the ladle. Larger particles with a 30 mm diameter remained at the surface of vacuum chamber due to their big buoyancy. Smaller particles had a larger desulfurization efficiency due to their bigger contact area with the molten steel, showing a rapid decrease of the sulfur content while a quick sulfur saturation due to their small volume. Larger particles maintained a longer desulfurization duration due to their bigger volume and big sulfur capacity as well. With a same injection rate, the total desulfurizer amount only influenced the final sulfur content and hardly influence the average desulfurization rate during the desulfurizer injection. The average desulfurization rate was influenced by the injection rate. The maximum desulfurization rate of 0.093 ppm/s was obtained with a 150 kg/min flow rate of the desulfurizer injection. Lowering lance position improved desulfurization efficiency and reduced final sulfur content as well. A regression formula was derived to quantitatively describe the effects of the size, the injection amount, the injection flow rate of desulfurizer particles, and lance position on the desulfurization rate, which can be used to predict sulfur variations in the molten steel during RH refining process.