Quasi-stationäres verhalten von wandernden brennzonen

✍ Scribed by E.D. Gilles

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 432 KB
• Volume: 29
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(74)80120-x

✦ Synopsis

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 quasistationary 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.

Vortmeyer

und Jahnel haben in[2] das Diffusions-