连续热镀锌锌锅内物理场的数值模拟

Numerical simulation of physical field in a continuous hot-dip galvanizing bath

在带钢连续热镀锌生产中,锌锅中的铝含量及其波动对产品质量有着极其重要的影响,而铝的质量浓度场的分布与锌液在锌锅内的流动、温度分布和锌铝锭的添加位置紧密相关。以某连续热镀锌锌锅为研究对象,采用流体力学方法研究锌铝锭添加对锌锅内流场、温度场和成分场的综合影响。模拟结果表明,自然对流效应改变了锌锅后侧锌液流动形式,冷锌液流向锌锅底部,锌锅后侧形成大范围涡流;锌锅整体温度波动较小,补锭口温度为锌锅最低,锌锅进出口温度较高;B锭(Zn-0.2%Al)融化补充的铝主要进入锌锅底部,高铝锌锭F锭(Zn-10%Al)的添加可调整V形区内的铝溶度分布。此研究为减少锌锅内铝浓度的波动和优化补锭工艺奠定了基础。

Aluminum content in zinc pot and its fluctuation have very important influence on the quality of the product in a continuous hot-dip galvanizing process. The distribution of aluminum concentration field is closely related to the flow of zinc liquid in zinc pot,the temperature distribution and the adding position of zinc aluminum ingot. The computational fluid dynamics method was used to study the influence of the addition of zinc aluminum ingot on the flow field,temperature field and composition field in a zinc pot. The simulation results show that the natural convection effect changes the flow pattern of the zinc bath behind the zinc pot,and the cold zinc liquid flows to the bottom of the zinc pot,and a large eddy is formed behind the zinc pan; The whole temperature fluctuation of zinc pot is small,the lowest temperature is at the ingots addition position,while the temperature is higher at the inlet and outlet of zinc pot; Aluminum melting from B ingot（ Zn-0. 2% Al） is mainly added into the zinc pot bottom,and the aluminum solubility distribution in the V-area can be adjusted by addition of high aluminum zinc ingot（ F ingot： Zn-10% Al）. This work provides a basis for reducing the fluctuation of aluminum concentration in the zinc pot and optimizing the ingot filling process.