Karl Konzelmann Metallschmelzwerke GmbH and the Institute of Resources Engineering of Delft University of Technology agreed upon a joint measuring and modelling program for a standard-type rotary furnace. The fundamental processes inside rotary furnaces as a function of various operating parameters are in fact not yet widely known. For example the economically decisive metal yield is predominantly controlled by the metal burn-off rate inside the furnace. However, this burn-off rate is neither measurable nor deducible from data so far routinely recorded at refiner plant operations. An aluminium refiner is rather interested in a feed forward control than in a retrospective explanation of past metallurgical errors. Therefore an extensive measuring program was carried out at Konzelmann's plant in Hannover during which meaningful data were registered or recorded and then methodically evaluated by interconnected mass- and energy balances. The output of such a combined Computer model was compared with actual operating results. Essential parameters were altered until actual furnace and model results were in acceptable conformity. As one final result, burn-off rates specific for different scrap categories were calculated from a total of 26 furnace cycles.
展开▼
