三流板坯非对称中间包内腔结构优化的数值模拟

Study on numerical simulation of control device optimization in the asymmetric tundish for three-strands slab casting

以某钢厂新设计的三流板坯非对称中间包结构为基础,通过改变其中挡渣墙的设计形式得到不同的中间包内腔设计方案。然后利用商业CFD软件Fluent数值模拟计算不同设计方案下中间包内钢液的流动特性和温度场分布,采用“刺激-响应”的方法模拟计算得到各方案下钢液在中间包内的RTD曲线。通过对各方案下时间特征量的比较分析,同时比较了夹杂物上浮的情况,得到最优的内腔结构设计。分析结果表明,采用斜挡渣墙的方案2得到的流场最佳,该方案下各水口钢液平均停留时间的标准差最小,为19.19 s,夹杂物上浮的概率也最大,对于直径100μm的夹杂物颗粒,上浮概率为94%。

Based on the newly designed three-strands slab asymmetric tundish structure of a steel plant,different design schemes for the inner structure of the tundish were obtained by changing the design form of the slag retaining wall.Then,the commercial CFD software Fluent was used to numerically simulate the flow characteristics and temperature field distribution of molten steel in the tundish under different design schemes.The"stimulus response"method was used to simulate and calculate the RTD curves of molten steel in the tundish under each scheme.By comparing and analyzing the time characteristics of various schemes and comparing the situation of inclusions floating up,the optimal internal cavity structure design was obtained.The analysis results show that Scheme 2 using inclined slag retaining walls achieves the best flow field.Under this scheme,the standard deviation of the average residence time of the molten steel at each nozzle is the smallest,the value is 19.19 s,and the probability of inclusions floating is also the highest,for inclusion particles with a diameter of 100μm,the floating probability is 94%.