70 t单管RH冶金传输行为的数值模拟

Numberical simulation for metallurgical transfer in 70 t single snorkel RH

为了深入了解70t单管RH内的冶金传输过程,分别采用欧拉欧拉方法、示踪剂输运方程和碳氧质量分数输运偏微分方程组描述RH内钢液流动行为、混匀过程和脱碳过程。数值模拟结果表明:随着真空度由250Pa降低到50Pa,循环流量和混匀时间保持不变,钢液中碳质量分数由81.8×10^-6降低到34.3×10^-6;随着底吹氩气量由100L/min增大到500L/min,循环流量由23.1t/min增加到42.2t/min,均混时间由179s下降到100s,钢液中碳质量分数由72.6×10^-6下降到47.5×10^-6。预测的脱碳曲线与工业实验数据符合良好;提高单管RH底吹氩气量,有利于提高循环流量,减少均混时间,降低钢液中碳元素质量分数。

In order to get a deep insight into the metallurgical transfer process in 70 t single snorkel RH,Euler Euler approach,tracer transfer model and partial differential equations for carbon and oxygen transfer were respectively applied to describe the fluid flow,mixing process,and decarburization process in RH.Numerical results show that,while the vacuum degree falls from 250 to 50 Pa,the circulation flow rate and mixing time almost remain unchanged,and the carbon mass fraction decreases from 81.8×10^-6 to 34.3×10^-6.While the ladle bottom blowing argon flow rate rises from 100 to 500 L/min,the circulation flow rate rises from 23.1 to 42.2 t/min,the mixing time decreases from 179 to 100 s,and carbon mass fraction decreases from 72.6×10^-6 to 47.5×10^-6.The predicted carbon mass fraction is in good agreement with the industrial experimental result.Increasing the flow rate of argon blown into the single snorkel RH is beneficial to increase the flow rate and reduce the mixing time and carbon mass fraction in liquid steel.