不同侧吹参数下RH内气液两相循环流动模拟研究

Numerical Simulation Study on Gas-liquid Circulating Flow at Different Side-injecting Conditions in RH Refining System

通过建立包括真空室、浸渍管、钢包的180 t RH气液流动三维物理数学模型,采用VOF两相流模型和应用FLUENT软件进行数值模拟研究了侧吹氩气喷孔布置方式及吹气量对RH内气液两相循环流动的影响。分析了喷气孔单层布置和双层交错布置对喷气流量和上下层间距对上升管出口截面含气率、上升管和下降管出口速度以及循环流量的影响。结果表明,氩气在上升管内贴壁上升,并携带钢液向上运动,沿着运动方向管内截面含气率逐渐增加,在出口截面处含气率达到最大;上升管出口截面含气率越小,上升管出口和下降管出口截面中心速度越大,循环流量越大,均混时间越短;喷气管双层布置、减小间距、增大吹气量,有利于循环流量的提高和均混时间的缩短。

By establishing three-dimensional physical and mathematical model of gas-liguid flow in 180 t RH including vacuum chamber,immersion tube and ladle,using VOF two-phase flow model and FLUENT software numerical simula-tion,the influence of side-blown argon nozzle arrangement and gas flow rate on gas-liquid two-phase circulation flow in RHis studied.The effects ofjet flow rate and upper and lower spacing on the void fraction of the outlet section of the riser,theoutlet velocity oftheriserandthe downcomer and the circulatingflowrate are analyzed as the jet holes arranging ina single layer and in a double-layerstaggered arangement.The results show that argonrises along the wall in the upward tube and carries the molten steel upward.The gas content in the cross section of the tube increases gradually along the di-rection of movement,and the gas content reaches the maximum at the outlet section,The smaller the void fraction of the outlet section of theriser is,thelargerthe central velocity oftheoutlet section oftheriserand theoutlet sectionofthe downcomer is,the larger the circulating flow is,and the shorter the mixing time is.The double-layer arrangement of the jet pipe,reducing the spacing and increasing the blowing volume are beneficial to the improvement of the circulating flow rate and the shortening of the mixing time.