Evaluation of thermophysical properties of silicon carbide, graphitic and graphitized carbon sidewall lining materials used in aluminium reduction cell in function of temperature

摘要

The thermal properties of the sidewall lining materials arerequired to ensure good predictions of the dynamic thermalbehavior of Hall-Heroult cells. A precise estimation of energylosses and location of the side freeze are made possible whenthese materials are well characterized as a function oftemperature. The present work uses transient characterizationtechniques to measure the thermal diffusivity, heat capacity andthermal conductivity of silicon carbide, graphitic and graphitizedcarbon materials. The thermal diffusivity and the heat capacity aremeasured using a state-of-the-art transient laser flash analyzer anda differential scanning calorimeter respectively. The thermalconductivity is calculated by assuming a constant density. Finally,based on the calculations conducted with a 2-D numerical model,the effect of the temperature varying thermal properties of thesidewall materials on the dynamic behavior of a laboratory scalephase change reactor is presented.