新型水口作用下的结晶器流场数值模拟

Numerical Simulation of Crystallizer Flow Field with New Type Nozzle

以结晶器表面的钢液流速和结晶器内的射流冲击深度作为参考指标,基于FLUENT对邯钢宽厚板坯连铸结晶器内流场进行数值模拟,研究该连铸机所用的A水口的性能及在该水口作用下的拉速、水口浸入深度对结晶器内流场的影响。结果表明:在A水口的作用下结晶器的表面流速大,射流冲击深度则较小,有较大的卷渣可能性;最大结晶器表面流速随着拉速的增大而逐渐增大,射流冲击深度则逐渐减小;结晶器表面流速随着水口浸入深度的增加而减小,射流冲击深度则增大;根据邯钢宽厚板坯连铸机的实际生产条件,在拉速较大时,应将A水口替换为平行水口;在使用A水口时,在适当降低拉速的同时,水口浸入深度也应适当增大。

The surface velocity and jet impingement depth in the crystallizer were taken as reference indexes, the flow field of continuous casting crystallizer for HanGang wide and thick slab was numerically simulated based on FLUENT. Using the nozzle A in the continuous casting machine, the effects of the casting speed and nozzle submergence depth on the flow field in the crystallizer were researched. The results show that, under the action of nozzle A, the surface velocity is higher, the jet impingement depth is smaller and the possibility of slag entrapment is larger. With the increase of the casting speed, the maximum surface velocity increases, the jet impingement depth gradually decrease. With the increasing of the submergence depth, the surface velocity becomes lower, the jet impingement depth is bigger. In the actual production process, when the casting speed is larger, nozzle A should be replaced by parallel nozzle; when using nozzle A, with a lower casting speed, the submergence depth should also be appropriately increased.