控流装置对板坯中间包流场优化的影响

根据相似原理,用1:3水模型研究了230 mm×130 mm板坯连铸用60 t中间包内钢水的流动特征,通过测定模型中间包内停留时间分布曲线,计算其平均停留时间及死区,活塞区和混合区的体积。结果表明,采用下挡墙开孔能有效地改善中间包内流场,得出优化后合适的钢包控流装置组合为开孔下挡墙+湍流控制器,下挡墙高133 mm,距离冲击区765 mm。优化后的中间包比原中间包平均停留时间增加了24 s,死区体积由原来的14.8%下降至6.7%。

Effect of Fluid Flow Control Devices on Optimization of Flow Field in Tundish for Slab Casting

Based on similarity principle, the flow performance of liquid in 60 t tundish for 230 mm x 130 mm slab casting has been studied by 1：3 water modeling test, and the average residence time, and the volume of dead area, plug area and mixed flow area are calculated by measured curves of residence time distribution (RTD) of liquid in modeling ladle. It is obtained that dam with holes is available to improve the flow field in tundish, the optimum combined device of inhibitors to improve the flow of liquid in tundish is turbulence inhibitor + dam with holes, of which the height of dam is 133 mm and the distance between dam and pouring region is 765 mm. As compared with original ladle, the average residence time of liquid in improved ladle increases by 24 s, and the dead area decreases to 6. 7% from original 14. 8%.