Wandgekühlte chemische Festbettreaktoren und deren Modellierung mit Ein- und Zweiphasenmodellen

摘要

Experimentally determined temperature and concentration profiles in a wall-cooled fixed-bed catalytic reactor are modelled equally well by the quasihomogeneous and heterogeneous model at a Reynolds number of Re_p = 32. In both cases the good agreement between measured and calculated data is only achieved if the equations are solved for a radially uneven flow distribution and for a boundary condition at the reactor wall ensuring the same temperature of catalyst and wall at the contact point. The numerical solutions of the two-phase model demonstrate that the differences between solid and fluid temperature are low, even in the presence of a highly exothermic reaction like the oxidation of ethane.