QU Tian-peng
,
LIU Cheng-jun
,
JIANG Mao-fa
钢铁研究学报(英文版)
The fluid flow in tundish is a non-isothermal process and the temperature variation of stream from teeming ladle dominates the fluid flow and thermal distribution in tundish. A numerical model was established to investigate the effect of inlet cooling rate on fluid flow and temperature distribution in tundish based on a FTSC (Flexible Thin Slab Casting) tundish. The inlet cooling rate varies from 0.5 to 0.25 ℃/min. Under the present calculation conditions, the following conclusions were made. When the stream temperature from teeming ladle drops seriously (for inlet cooling rate of 0.5 ℃/min), there is a “backward flow” at the coming end of casting. The horizontal flow along the free surface turns to flow along the bottom of tundish. The bottom flow shortens the fluid flow route in tundish and deteriorates the removal effect of nonmetallic inclusions from molten steel. Nevertheless, when the inlet cooling rate decreases to 0.25 ℃/min, the horizontal flow is sustained during the whole casting period. The present research provides theoretical directions for temperature control in teeming ladle and continuous casting tundish during production of advanced steels.
关键词:
tundish
,
thermal distribution
,
unsteady
,
numerical simulation
冯捷
,
包燕平
,
唐德池
钢铁
通过建立1∶3的水模型试验，对某钢厂的中间包进行挡墙优化及气幕挡墙试验，运用fluent6.3软件，对水模型试验结果进行数值模拟计算。挡墙优化后中间包采用方形有檐湍流控制器，下挡墙高400mm，距离冲击区的距离为2295mm。气幕代替下挡墙试验，得出较优的吹气量为1.5m3/h，吹气位置应距离冲击区2295mm。进行中间包吹气工业试验，得出吹气后的中间包铸坯全氧质量分数为29.8×10-6，较原中间包铸坯的34.7×10-6，减少141%。大颗粒夹杂物含量由原来的5.83mg/(10kg)减少到 4.30mg/(10kg)。
关键词:
中间包
,
numerical simulation
,
physical simulation
,
gas blow
罗利华，佐祥均
连铸
钢液在中间包内液位直接影响到连铸生产过程的顺行和铸坯质量。着力于研究和分析方坯连铸生产过程中钢包滑动水口开口度，中间包钢液面，水口结瘤程度以及浇铸速度之间的关系，并推导出相关数学关系式。同时，基于重庆钢铁公司方坯连铸机的实际情况，计算了在一定浇铸速度和结瘤程度下，中间包内所需的理论液面高度，滑动水口的开口度，在此基础上绘制了钢包滑动水口操作控制图，以期能够实现一定的现场指导作用。
关键词:
中间包
,
bath level of molten
,
casting speed
