ABSTRACT

Low sulfur content is crucial in secondary steelmaking to enhance steel quality. The desulfurization rate is influenced by slag-steel interactions, including slag eye size and interfacial mass transfer coefficient. Gas-stirred ladles can impact the interaction through stirring conditions such as argon flow rate and dual plug separation angle. Using a 3D CFD simulation model, the effects of different stirring conditions on the desulfurization rates, molten steel flow, and slag-steel interfacial behaviors were investigated. Results showed that 180° separation angle leads to higher desulfurization efficiency than 90°. A higher argon gas flow rate increases desulfurization rate, and using 20 SCFM (8.92×10_-3 Nm₃/s) argon flow rate for both plugs resulted in higher desulfurization rate than using 5 SCFM (2.23×10_-3 Nm₃/s) for one plug and 20 SCFM for the other. The smallest desulfurization efficiency was observed when using 5 SCFM for both plugs.

摘要

低硫含量对于二次炼钢对于提高钢材质量至关重要。脱硫率受渣-钢相互作用的影响，包括渣眼尺寸和界面传质系数。气体搅拌钢包可以通过氩气流量和双塞分离角等搅拌条件影响相互作用。利用3D CFD模拟模型，研究了不同搅拌条件对脱硫率、钢水流动和渣钢界面行为的影响。结果表明，180°分离角比90°分离角脱硫效率更高。较高的氩气流量可提高脱硫率，采用20 SCFM（8.92×10 _-3 Nm ₃/s) 两个塞子的氩气流速比一个塞子使用5 SCFM (2.23×10 -3 _Nm 3 _/ s) 和另一个塞子使用20 SCFM 更高的脱硫率。当两个塞子均使用 5 SCFM 时，观察到脱硫效率最小。