中间包下挡墙溢流卷渣行为

通过采用数值模拟、水模型实验和工业试验相结合的方法研究了中间包内钢水液面在下挡墙时的卷渣行为.数值模拟结果发现:当钢液面接近下挡墙时,上下挡墙间钢液面容易暴露,造成钢水氧化,在下挡墙出口区一侧容易造成钢渣乳化和卷渣,在出口区下挡墙与中间包壁形成的角部区域卷渣趋势更大;溢过下挡墙的流体对下挡墙冲蚀较严重,在实际生产中将缩短中间包寿命;当中间包液面降低到下挡墙附近时在下挡墙处形成的卷渣很难在中间包内上浮去除,容易进入结晶器.水模型实验和工业试验同时验证了这一结果.

Mechanism of slag entrapment at the overflow weir in tundishes

The mechanism of slag entrapment at the overflow weir in a tundish was studied by the combined methods of numerical simulation, water modeling experiment and industrial test. The results show that liquid steel between the dam and weir is at the risk of being exposed to air and being oxidized when its level (surface) is close to the weir top. At the same time, steel-slag emulsification and slag entrapment at the weir outlet area may happen. The possibility of slag entrapment is higher at the triangle area from the weir to the tundish wall. The liquid steel flow over the weir will erode the weir, and also shorten the life of the tundish. In addition, the entrapped slag is easier to enter the mould. This result is confirmed and verified by water modeling experiment and industrial test.