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Published in:
2016 | OriginalPaper | Chapter
MHD Stability for Irregular and Disturbed Aluminium Reduction Cells
Authors : Valdis Bojarevics, Sharnjit Sira
Published in: Light Metals 2014
Publisher: Springer International Publishing
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The MHD stability of regular cells in pot line is well represented in the literature, and validated numerical tools are available to optimize their performance. The presence of irregular cells is more of a rule than an accident in the commercial practice requiring additional flexibility when modeling such cells interspersed between normal ones. The new options in the code for MHD analysis permit to include such technological variations as change of anodes at arbitrary position, parallel change of several anodes, variation of the contact resistances in anode clamps, cathode flex joints, collectors, electrolyte and overvoltage. The extended model capabilities include the presence of anode channels, cell bottom non-uniformities and variable bottom ledge. Options to build a user specified magnetically compensating bus network, to account for a stopped neighbor pot (shunted) and end of line pots with significantly disturbed magnetic field are numerically tested for the 500 kA cell pot line.