RH精炼装置流场对混合、脱碳、夹杂物行为的影响

基于计算流体力学、反应热力学及动力学，对RH气液流场、脱碳及夹杂物碰撞长大进行了数值模拟. 结果表明，在提升气量为400 NL/min条件下，气泡在上升管存在贴壁效应；1000 NL/min下，侧吹气体可形成吹透现象；RH脱碳处理中，0~3 s的脱碳速率为45~70 mol/s，3~500 s时降低到5 mol/s，500 s后脱碳速率进一步降低；经过14 min处理后夹杂物质量浓度可降低到5′10-5以下；数值模拟结果与实验测量结果符合良好，说明数值模拟方法可完全用于RH真空精炼过程中关键工艺参数的预测.

Effect of Flow Field on Mixing, Decarburization and Inclusion Removal in RH Degasser

Based on the computational fluid dynamics, reaction thermodynamics and kinetics, the gas-liquid flow field, decarburization, collision and aggregation behavior among inclusions were investigated by numerical method. The numerical results show that the gas bubbles rise up near the wall in the up snorkel when the gas flow rate is 400 NL/min. The gas bubbles can reach the up snorkel centre when the gas flow rate increases to 1000 NL/min. The decarburization rate is about 45~70 mol/s during the first 3 s, decreases to 5 mol/s during 3~500 s, and decreases further after 500 s. And the inclusion mass concentration can be decreased to 5′10-5 after 14 min treatment. Furthermore, the predicted results agree well with the measured experimental results. Thus, the numerical simulation method can be employed to predict the critical technologic parameters during RH vacuum refining process.