热镀锌工艺中锌液表面流速的在线电磁测量
收稿日期: 2020-01-16
修回日期: 2020-04-23
网络出版日期: 2020-05-11
基金资助
中国科学院大学一流学科建设项目(111800XX62)
Online Electromagnetic Measurement of Molten Zinc Surface Velocity in Hot Galvanized Process
Received date: 2020-01-16
Revised date: 2020-04-23
Online published: 2020-05-11
Supported by
Institute Collaborative Innovation Fund of University of Chinese Academy of Sciences(111800XX62)
通过Lorentz力测速方法对热镀锌工艺中锌锅内锌液流速进行了测量研究。该方法具有非接触式、在线、连续测量的特点和优势。设计了适合镀锌工艺特点的电磁流速测量仪，通过数值建模和模拟实验进行了校准，并进行了工厂测试，分析了锌液的流动行为和流场特点。测量结果表明，该方法可对锌液的表面流速进行实时、在线、定量的测量，为冶金工业生产中高温金属液流速监测提供了一种新手段。
关键词： 热镀锌; 锌锅; 锌液流速; 电磁感应; Lorentz力测速
郑锦灿 , 刘润聪 , 王晓东 . 热镀锌工艺中锌液表面流速的在线电磁测量[J]. 金属学报, 2020 , 56(7) : 929 -936 . DOI: 10.11900/0412.1961.2020.00024
The behavior of zinc flow in the zinc bath plays an important role in hot galvanizing process, which has an important influence on the temperature distribution, the composition of zinc coat, the control of air knife, and so on, thus affecting the surface quality of zinc products (surface oxidation, rake slag). However, due to the high temperature, strong activity, opacification of the zinc bath and harsh, complex industrial environment, it is difficult to directly measure the flow behavior of zinc in the zinc bath through conventional methods. In this work, based on the principle of electromagnetic induction, Lorentz force velocimetry (LFV) method was used to measure and analyze the velocity of zinc flow in the bath during the galvanizing process for the first time. The LFV has the characteristics and advantages of non-contact, online and continuous measurement, and can realize the real-time quantitative measurement of molten metal flow by reasonable design and ingenious implementation. The key parameters of LFV, such as the gap between device and molten zinc, penetration depth and geometry of the applied model, were discussed through numerical analysis, the LFV device suitable for the characteristics of zinc plating process was designed, and the in-plant measurement was carried out. The results show that the fluctuation range of zinc flow velocity in the zinc bath is almost 0.13~0.20 m/s, which is within typical range referenced in previous studies. In addition, the flow behavior and flow field characteristics of zinc liquid were analyzed, and these discussions reflect the capacity of zinc slag or ash in the zinc flow at the monitoring position. The work promoted in this study revealed that this LFV method can measure the surface velocity of zinc liquid in real time, on-line and quantitatively, which provides a new way for the velocity monitoring of high temperature liquid metal in metallurgical industry.
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