KR法中桨叶结构对搅拌效率影响的数值模拟研究

Numerical simulation of the effect of blade structure on mixing efficiency in KR method

KR法是铁水预处理中主流的脱硫方法。采用数值模拟方法研究了正四叶桨、螺旋三叶桨和双层正四叶桨三种桨叶的搅拌效率,结果表明:双层正四叶桨的混匀时间比正四叶桨短7.3%,比螺旋三叶桨短37.9%;通过对铁水中轴向速度、湍动能分布的分析发现,双层正四叶桨搅拌器中铁水轴向速度更大,并且铁水中湍动能广泛扩散,双层正四叶桨的平均湍动能比正四叶桨大28%,比螺旋三叶桨大1.8%。

KR(Kanbara Reactor)method is the mainstream desulfurization method in hot metal pretreatment.The mixing efficiency of three kinds of blades,namely,the regular four-blade propeller,the spiral three-blade propeller and the double-layer regular four-blade propeller,was studied by numerical simulation method.The results showed that the mixing time of the double-layer regular four-blade propeller was 7.3%shorter than that of the regular four-blade propeller,and 37.9%shorter than that of the spiral three-blade propeller.Through the analysis of the axial velocity and turbulent kinetic energy distribution in the molten iron,it was found that the axial velocity of the molten iron in the double-layer regular four-blade propeller agitator was larger,and the turbulent kinetic energy in the molten iron was widely diffused.The average turbulent kinetic energy of double-layer regular four-blade propeller was 28%greater than that of regular four-blade propeller and 1.8%greater than that of spiral three-blade propeller.