Research And Application On The Coupled Simulation Method Of Electric Field,Magnetic Field,Flow Field In Prebaked Anode Aluminum Reduction Cells

Coupled action of. electric field, magnetic field , flow field and electric-heat field in aluminum reduction cells has a significant influence on the current efficiency, energy consumption and the cells life. So, it is very important in theoretic and practical guideline for improving of the optimization design > engineering analysis and development of new cells with deeper understanding coupled relation of electric field, magnetic field and flow field of melt-THREE FIELD in aluminum reduction cells, choosing the appropriate mathematical model of THREE HELD, and improving precision of computed result of THREE FIELD .This paper used the latest progresses of THREE FIELD, deduced a simulation model of THREE FIELD, computed and analyzed it base on the coupled relation of THREE FLIED. The coupled simulation computation of THREE FIELD is done by using a coupled simulation integrated software system which is developed based on commercial software ANSYS.Using this simulation integrated software system , THREE FIELD on three kind of prebaked anode reduction cells (154 kA aluminum reduction cells with two end risers, 154kA aluminum reduction cells with four side risers and 200kA aluminum reduction cells with four side risers) are computed, and the practicability and accuracy of mathematical model of THREE FIELD and simulation integrated software system are proved with measured data. The simulation indicates that the error of magnetic field is less than 20.0% and of flow field is less than 10.0%.Based on 154 kA aluminum reduction cells with four side risers, influence of super heat on THREE FIELD in aluminum reduction cells has been studied. The results indicate that super heat has few influence on current distribution of cathode and anode as well as average magnetic field. When the super heat increases, the current density of melt decreases and maximal and average flow rate of melt increases a little. Considering cell life in 154kA aluminum reduction cells with four side risers, super heat should be decreased, and appropriate super heat should be 12~ 15℃.For a real situation of low current density of aluminum reduction cells in our country, A154 kA aluminum reduction cells with four side risers is considered. The influence of current strengthen on THREE FIELD in aluminum reduction cells has been studied. The results indicate that|Bx|max, ||By|max,|Bz|max have the same increase rate with current intensity as well as maximal and average flow rate of melt. For the real situation in LongXiang Aluminum Ltd., the optimized measures after current strengthen are: increasing the length of anode and cathode, raising aluminum level properly, decreasing ACD and molecule rate. It is verified that these measures are of great helpful for product in current sthrength.