Abstract: In order to reduce the rejection rate of tundish tailing slab, prevent the slag entrapment of liquid in tundish in tailing slab decreasing casting speed process,the effect of casting speed change during tailing slab casting process on turbulence slag entrapment of liquid in a 80 t tundish for No3 slab caster at steelworks has been studied,and the optimization of process of decreasing tailing slab casting speed is carried out by using fluid dynamics software FLUENT. The optimization scheme to decrease the tundish tailing slab casting speed is defined by analysis on the turbulent kinetic energy-time tracking curves in remain time course after each casting deceleration. Based on the original scheme the casting heel increases from 8 t to 10 t,the duration of casting at each casting speed shortens and the final casting closing-up operation increases from 0. 1 m/min to 0. 2 m/min to reduce the possibility of tailing slab slag entrapment and decrease the production cost, the time of tundish tailing slab casting duration saves by 266. 8 s and the amount of saving liquid is 5. 08 t. After using the optimized operation at 300 mmx2000 mm No3 slab caster the total amount of rejected tail slab per month decreases from 576.4 t to 139. 1 t.

摘要： 为降低中间包尾坯判废率,预防中间包尾坯降拉速过程钢液卷渣,应用流体力学软件FLUENT,对尾坯降拉速过程进行优化,研究尾坯拉坯过程的拉速变化对钢厂3^#板坯连铸机80 t中间包钢液紊流卷渣的影响。通过每次降拉速后的停留时间历程的湍动能时间跟踪曲线分析,确定了中间包尾坯降拉速优化方案。该方案在原方案基础上,将8 t铸余增加到10 t,缩短了各拉速下的持续拉坯时间,并将封顶操作从0.1 m/min提高到0.2 m/min,可减小尾坯卷渣的可能性和降低了生产成本,节约中间包尾坯降拉速总时间266.8 s和节约钢水量5.08 t。300mm×2000 mm 3^#板坯连铸机采用优化操作后,每月尾坯废品总量从576.4 t降低到139.1t。

关键词: 80t中间包, 300mm板坯, 尾坯, 卷渣, 数学模拟, 优化效果