加装锌灰过滤系统的炉鼻子流场模拟计算

热镀锌过程中,炉鼻子内需通入加湿气体以抑制锌液面处锌灰的产生。安装在炉鼻子外部的锌灰循环过滤系统可以有效过滤锌灰,防止锌灰聚集,避免造成带钢表面缺陷。为了科学合理地设计炉鼻子外部锌灰循环过滤系统,采用计算流体力学方法对炉鼻子内部流场进行了模拟计算,研究了炉鼻子开启锌灰过滤系统后其保护气流场、锌灰捕集效率、水蒸气含量等参数的变化规律,得出了炉鼻子锌灰过滤系统抽气口高度和抽气量的最佳参数组合。经实际使用验证,改善锌灰缺陷效果显著,为炉鼻子锌灰过滤系统的设计、安装和调试提供了技术支持。

Simulation calculation of gas flow field in furnace snout with zinc ash filtration system

During hot-dip galvanizing process, humidified gas should be introduced into the furnace snout to suppress the generation of zinc ash on the surface of zinc liquid. The zinc ash circulating filtration system installed outside the snout can effectively filter zinc ash, prevent zinc ash from accumulating and avoid surface defects of the strip. In order to design the zinc ash circulating filtration system scientifically and reasonably, computational fluid dynamic method was used to simulate gas flow field. The variation of protective gas flow field, capture efficiency of zinc ash and the content of water vapor in the snout after turning on the filtration system was investigated. The optimal parameter combination of the suction port height and suction volume was obtained, and practical application proved that the effect of reducing zinc ash defects was remarkable. The results provide a technical support for the design, setup and debugging of the zinc ash filtration system.