连续热镀锌锌锅中铝锭添加位置对有效铝分布的影响

Influence of Different Ingots Adding Location on Effective Aluminum Concentration in a Continuous Hot-Dip Galvanizing Bath

在带钢连续热镀锌工艺中,维持有效铝浓度的稳定对保证带钢产品质量十分重要,而实践表明铝锭的添加位置严重影响着带钢附近铝的浓度场。以某钢铁企业的一个热镀锌锌锅为研究对象,使用计算流体力学方法对锌锅内的流场、温度场和有效铝浓度场进行模拟研究,分别比较在锌锅前方、后方和带钢侧方3个不同位置添加铝锭对锌锅内有效铝浓度场的影响。结果表明,在带钢侧方加入铝锭的效果较好,能有效地补充带钢镀层上消耗的铝,并且锌渣附着在带钢表面的几率较小;而在锌锅前方加入铝锭则效果最差,由于带钢的阻隔作用,使熔融的铝不容易扩散到带钢V型区域。本文结果为热镀锌锌锅的补铝过程提供了参考。

In order to ensure the strip quality, it is important to keep the effective aluminum concentration stable in the continuous hot-dip galvanizing process. The production process shows that the effective aluminum concentration near the strip is mainly affected by the location of adding ingots. In this paper,three locations of adding ingots such as back （case 1）, front of the bath （case 2）and near the strip （case 3） are considered. The flow fields, heat transfer and effective aluminum concentration under the three cases are then simulated and compared. The results show that it is hard for aluminum to diffuse into V region due to the hinder effect of the strip in case 2. While in case 3, ingots can replenish the aluminum consumption in the coating, and the chance of the dross adherence to the strip surface is much lower. Therefore, case 3 is superior to the other two cases. The results could be a reference for the process of adding ingots in the hot-dip galvanizing bath.