热镀锌锅内锌液物理场特性的研究

RESEARCH ON THE CHARACTERISTICS OF PHYSICAL FIELD OF MOLTEN ZINC IN HOT DIP GALVANIZING POT

连续热镀锌生产过程中,锌液的表面会出现大量浮渣,如不及时清除,可能会粘附在热镀锌板表面,导致表面缺陷。渣体的产生与锌液物理场密切相关,同时除渣环节会引起物理场的变化,因此有必要对锌液物理场开展系统性研究。通过构建锌锅及锌液的几何模型,采用标准k-ε双方程湍流模型,获得流域内物理场(速度、温度、浓度场)分布规律,确定漩涡分布特性,以及除渣动作过程中各物理量随时间变化的规律。通过理论计算,可以有效预测锌锅内锌渣的分布规律以及除渣作业危险区,为除渣机器人的设计提供重要理论依据,确保镀锌层质量,提高除渣效率。

A lot of drosses appear on surface of molten zinc in the process of continuous hot dip galvanizing. The drosses, if not cleared in time, adhere to the surface of hot galvanized sheet and lead to surface defect. The production of zinc dross is closely related to the physical fields of molten zinc and dross remove can change of the physical fields, so it is necessary to carry out systematic research on the physical fields. Through the standard k-~ turbulence model and the geometric model of galvanizing pot and molten zinc, the author finds out the distribution regularities of the physical fields （ such as speed, temperature and concentration field） and the laws of these physical quantities changing with time, and determines the distribution characteristics of the vortex. The theoretical calculations can be used to predict the distribution regularity of zinc dross and the danger zone of the dross removing operation, provide important theoretical basis for the design of dross removing robot, and ensure the quality of zinc coating and improve the efficiency of dross removing.