Modeling, simulation and stabilizing H∞-control of an oscillating continuous crystallizer with fines dissolution |
| |
Authors: | S Motz A Mitrovi? U Vollmer |
| |
Affiliation: | a Institut für Systemdynamik und Regelungstechnik, University of Stuttgart, 70550 Stuttgart, Germany b Max-Planck-Institut für Dynamik komplexer technischer Systeme, Sandtorstr. 1, 39106 Magdeburg, Germany |
| |
Abstract: | In this contribution, a detailed model for a continuous crystallizer with fines dissolution is derived. The main focus of this article is the identification of physical reasons responsible for oscillations occurring in these crystallization plants. In contrast to many other crystallization models used in literature for the investigation of such limit cycles, detailed kinetic expressions for crystal growth and attrition, as well as for the separation of fines in the annular zone, are incorporated. By dynamic simulations of the model and by comparison with measured data, an undesired dissolution of larger crystals can be identified as a possible reason for the appearance of sustained oscillations. Finally, a stabilizing feedback controller is designed using H∞-theory. It is demonstrated in simulations that this controller enables stable operation of the crystallizer even at a high fines dissolution rate. |
| |
Keywords: | Detailed crystallization model Population balance Fines dissolution Sustained oscillations Limit cycles H&infin -control |
本文献已被 ScienceDirect 等数据库收录! |
|