吹氩宽厚板坯连铸结晶器内液面波动行为的水模型研究

Study on Simulation of Level Fluctuation in Wide and Thick Slab Continuous Casting Mould with Argon Blowing

基于相似理论,利用物理模拟研究了吹氩条件下宽厚板坯结晶器内的液面波动行为,考察了吹气量、水口侧孔倾角及水口浸入深度对结晶器内液面波动行为的影响.结果表明,结晶器吹氩后,各气量下液面平均波高均增加了1.2倍以上;结晶器内液面平均波高随吹气量的增加先增大后减小;随水口侧孔倾角及浸入深度的增大,液面平均波高均先减小后增大.从实验条件下得到的控制液面波动的最佳工艺参数为4L/min的吹气量,-15o的水口侧孔倾角,140mm的水口浸入深度.

A physical model was established to study the level fluctuation in a wide and thick slab continuous casting mould with argon blowing, and the effects of gas flowrate, outlet angle and immersion depth of submerged entry nozzle (SEN) investigated. The results showed that the average level fluctuations in the mould all had more than 1.2 times increase under the experimental gas flowrates than that without argon blowing. With the increase of gas flowrate, the average level fluctuation increased first and then decreased. While, the average level of fluctuation decreased to a minimum, then increased with the increase of outlet angle and immersion depth of SEN. Furthermore, the optimal process parameters to restrain the level fluctuation were obtained as follows: argon gas flow rate of 4 L/min, nozzle side port angle of -15° and nozzle submergence depth of 140 mm.