Quasi-stationäres verhalten von wandernden brennzonen

Abstract

During the performance of a fast exothermic reaction in a catalyst bed, the complete chemical reaction can occur in a very short moving reaction zone, which frequently only ranges over a few pellet diameters. Experimental examinations, made by Wicke and Vortmeyer, on the behavior of such a moving reaction zone resulted in the following fact: through variation of the flow velocity u in axial direction of the bed, this zone can optionally be moved. If the conditions of the reaction are time constant, and the reactor is sufficiently long on both sides, a quasi-stationary axial movement of this reaction zone appears. This movement is characterized through a constant velocity w. For these quasi-stationary dynamics, the diffusion model's equations are approximately solved. From these, the velocity w of the moving reaction zone can be determined as a function of all parameters of reaction and reactor. This can be done in a very distinct way by means of a graph.