Keywords: entropy generation, mathematical modelling, model validation, exergy analysis, aluminium electrolysis, exergy balance, electrolysis cells, heat transfer
Mathematical models validation of aluminium electrolysis process using exergy method
A new method of validation of the mathematical model of the processes taking place inside the aluminium electrolysis cell has been proposed. The method is based on the comparison of the calculation results of the entropy generation rates obtained in theoretical way with the exergy losses estimated from global exergy balance equation. The following irreversible processes have been analysed - electric current flow, diffusion at the cathode, heat and electric current flow through the anode and cathode, irreversible carbon combustion, heat transfer from electrolyser to the surroundings and convection inside the electrolyte. Exergy balance calculations have been based on the experimental results from industry for two different electrolysis cells - with baked anode and Söderberg type. The proposed procedure shows good accuracy between mathematical model and experimental data.