底吹-机械搅拌耦合铁水脱硫的模拟

Simulation on Desulfurization of Molten Iron with Bottom Blown-Mechanical Stirring Coupled

针对底吹-机械搅拌耦合铁水预处理脱硫的气体与熔体的相互作用过程,利用CFD商业软件Fluent 15.0和物理模拟的方法,针对某钢厂120 t底吹钢包脱硫过程进行实验研究,并从流场、气体体积分布等方面研究了搅拌桨结构、搅拌转速、通气流量、偏心度对铁水包内钢液混合效果的影响.结果表明:使用SSB-D桨,搅拌转速200 r/min,通气流量为1.5 m3/h,偏心度0.4时,熔池内的流场分布得更均匀,镁蒸气气泡在铁水中更加分散和细化,增加了镁蒸气与铁水的气液接触面积,提高了镁蒸气的脱硫效率.

To understand the interaction between bubble and melt in desulfurization of hot metal pretreatment with bottom blown-mechanical stirring coupled, the CFD commercial software Fluent 15.0 and physical simulation method were used to study on desulfurization process of 120 t bottom blown ladle. The influence of impeller structure, rotation speed, gas flow rate, eccentricity on the mixing effect of molten steel in ladle was investigated from the aspects of flow field and gas volume distribution. The results showed that, under the conditions of using the SSB-D impeller, the rotation speed of 200 r/min, the gas flow rate of 1. 5 m^3/h and the eccentricity of 0. 4,the flow field distribution in the molten iron is more uniform while the magnesium vapor bubbles are more dispersed and refined in the molten iron. The gas-liquid contact area of magnesium vapor and hot metal is increased to improve the desulfurization efficiency of magnesium vapor.