底吹钢包内流动及混合的两相流数值模拟

应用欧拉-欧拉模型建立了钢包内钢液流动及混合过程的数学模型,考察了吹气量对中心底吹及偏心底吹钢包内流场及均混时间的影响。计算结果表明,钢包底部四周为流动缓慢区域;吹气量越大,一方面可以降低均混时间,另一方面会导致钢包自由液面的钢液流速增大,从而容易造成卷渣;从缩短混合时间,提高生产效率考虑,偏心底吹更为有利。

Two-phase Numerical Simulation on Flow Field and Mixing Process in Ladle with Bottom Blowing Method

On the base of the Eulerian-Eulerian model,a mathematical model about the fluid flow and mixing in ladle was developed to investigate the effect of gas flow rate on the flow field and mixing time on the condition of central and eccentric bottom blowing.The numerical results show that flow around the bottom of ladle is very slow.With the increasing gas flow rate,the mixing time decreases,the velocity of molten steel at the free surface increases and the slag entrapment happens.In order to decrease mixing time and increase the production efficiency,the eccentric bottom blowing is more effective.