| The production of aluminum reduction cell is a complex process involving multi-physical field changes of electricity, magnetic, thermal field, force field, flow and others. The study of electric-magnetic-flow field of aluminum reduction cell related to a plurality of cross-disciplinary such as electromagnetics and fluid dynamics, which have important academic value. On the other hand, the knowledge for multi-physical fields of aluminum reduction cell can guide the actual production, benefit to the important indicators such as the aluminum reduction cell's production efficiency, life, etc., which is of great significance. Because of the complexity of the production process of aluminum reduction cell, exploring the mechanism through numerical simulation analysis for each rule of aluminum cell physics is a very important means of the research into the aluminum reduction cell.In this paper, the numerical method was used for the simulation of electric-magnetic-flow field of a 420 KA cell. The effects of the electromagnetic force and the bubbles on the flow field of the aluminum reduction cells were compared, as well as the impact of the magnetic field of different directions on the cell further. Meanwhile, the modeling and analysis about the various operating conditions of the cell as well as special-shaped cathode were conducted. The main results are as follows:(1) Using the commercially available software SolidWorks, a fine aluminum reduction cell 420 KA full tank geometrical model was established, and electromagnetic field analysis was carried out by means of the Maxwell; A three-phase flow steady flow was modelled on the CFX platform, and the calculation of the flow field was conducted as well. The flow pattern and electrolyte aluminum electrolytic tank- aluminum liquid interface shape under normal circumstances were obtained.(2)Effects of the electromagnetic force and the bubble on flow field of aluminum liquid were compared as well as the effect of the magnetic field of different directions on the flow field further. The results indicate that the bubble is able to slow the flow of aluminum liquid; The deformation of electrolyte-aluminum liquid interface is mainly influenced by the magnetic field of X direction; The shape of flow field in the cell is mutually influenced by the magnetic field in X direction and Y direction.The magnetic field enhancement in Y direction will enhance the two large vortex at the ends of the aluminum electrolytic cell, and magnetic field enhancement in X direction will intensify the local flow inside the tank.(3)The simulation and analysis on models of different aluminum levels, pole changing operating conditions and the different cathodes have been conducted. The results indicate that both the average velocity of molten aluminum and deformation of the interface in the 23 cm and 25 cm aluminum level model are relatively small, and four eddies arise in flow field of 27 cm aluminum level model; the influence of pole change on the corners on electrolytic cell is greater than that of the middle part; the adoption of special-shaped cathode can obviously reduce the average flow velocity of aluminum liquid. |
PDF Full Text Request