基于KR法新型脱硫搅拌器的流场数值分析

Numerical analysis of flow field based on the new desulfurization agitator of KR method

为改进铁水预处理脱硫设备和工艺,提高脱硫效率,参考传统KR脱硫法,将搅拌器与喷枪的优点结合,形成了一种既搅又喷的新型搅拌器。应用Fluent软件,采用Eulerian模型对铁水罐内的流场进行数值分析,从流场速度和气体分布等方面研究了搅拌器不同的偏心度、搅拌转速、通气流量对铁水罐内脱硫效果的影响。结果表明:采用新型搅拌器,可增强流场的流动,由搅拌器底部喷嘴喷出的脱硫气体作螺旋上升运动,会使脱硫气体在铁水罐中分布范围更广且更加均匀;新型搅拌器在搅拌转速为150 r/min、通气流量为5.0 m^3/h和偏心度为0.3时,气体的分布和密集程度最佳,流场具有较大的平均流速,有利于铁水与脱硫剂的反应。

In order to improve desulfurization equipment and technology of hot metal pretreatment,and improve the desulfurization efficiency,a new type of agitator was formed through combining the advantages of agitator and spray gun with reference to the traditional KR desulfuration method.The flow field in the hot metal tank was analyzed by Fluent software and Eulerian model.The effects of different eccentricity,stirring speed and ventilation flow of the agitator on the desulfurization effect were studied from the aspects of flow velocity and gas distribution.The results showed that the new agitator could enhance the flow field,and the desulfurization gas ejected by the nozzle at the bottom of the agitator would make the desulfurization gas spread more widely and more evenly in the hot metal tank.When the new agitator had a stirring speed of 150 r/min,ventilation flow rate of 5.0 m^3/h and eccentricity of 0.3,the distribution and intensity of gas was the best,and the flow field had a large average velocity,which was beneficial to the reaction of hot metal and desulfurization agent.