RH真空精炼吹氩喷嘴结构参数对循环流量影响的数值模拟

Numerical simulation of the effect of structural parameters of argon blowing nozzle on circulation flow rate during RH vacuum refining process

循环流量是判断RH真空脱气装置精炼效率的重要指标之一。本文针对某钢厂180t RH真空精炼装置,基于计算流体动力学(CFD)方法,建立了RH真空精炼过程中气泡驱动的气-液两相流动理论模型,并利用CFD商业软件FLUENT进行数值模拟,探讨了相同真空度下吹氩喷嘴分布形式、喷嘴排间距等参数对循环流量的影响。结果表明:相同真空度和吹氩流量条件下,相比于单排圆周均布形式,喷嘴双排圆周交错分布时的循环流量更大、精炼效率更高,并存在最优的排间距,可作为RH真空精炼操作参数优化及工程结构改进的参考。

The circulation flow rate is one of the most important factors that determine the refining efficiency of RH vacuum degassing vessel.Aiming at an 180t RH vacuum refining equipment,a theoretical model for the two-phase flow driven by the gas bubbles during RH vacuum refining process was established based on the computational fluid dynamics （CFD）,and the commercial software FLUENT was used to the numerical simulation in this paper.The effects of the argon blowing nozzle distribution pattern and the nozzle spacing on the circulation flow rate under the condition of the same vacuum degree were discussed.The resuhs show that,compared to the nozzles with single-row circumferential arrangement,the nozzles with double circumferentially staggered arrangement have larger circulation flow rate and higher refining efficiency,and there is an optimal row spacing which may provide references for the optimization of RH vacuum refining operation parameters and engineering structure improvement.