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Dynamics and Predictive Control of Gas Phase Propylene Polymerization in Fluidized Bed Reactors

Chinese Journal of Chemical Engineering 2013年第9期21卷 1015-1029页

作者： ahmad shamiri Mohamed azlan Hussain Farouq sabri Mjalli Navid Mostoufi Seyedahmad Hajimolana~ Department of Chemical Engineering University of Malaya Kuala Lumpur 50603 Malaysia Training Center Razi Petrochemical-Company Bandar Imam 161 Iran UM Power Energy Dedicated Advanced Centre (UMPEDAC) University of Malaya Kuala Lumpur 50603 Malaysia Petroleum and Chemical Engineering Department Sultan Qaboos University Muscat 123 Oman Process Design and Simulation Research Center School of Chemical Engineering College of Engineering University of Tehran Tehran 11155/4563 Iran

A two-phase dynamic model, describing gas phase propylene polymerization in a fluidized bed reactor, was used to explore the dynamic behavior and process control of the polypropylene production rate and reactor temperature. The open loop analysis revealed the nonlinear behavior of the polypropylene fluidized bed reactor, jus- tifying the use of an advanced control algorithm for efficient control of the process variables. In this case, a central- ized model predictive control （MPC） technique was implemented to control the polypropylene production rate and reactor temperature by manipulating the catalyst feed rate and cooling water flow rate respectively. The corre- sponding MPC controller was able to track changes in the setpoint smoothly for the reactor temperature and pro- duction rate while the setpoint tracking of the conventional proportional-integral （PI） controller was oscillatory with overshoots and obvious interaction between the reactor temperature and production rate loops. The MPC was able to produce controller moves which not only were well within the specified input constraints for both control vari- ables, but also non-aggressive and sufficiently smooth for practical implementations. Furthermore, the closed loop dynamic simulations indicated that the speed of rejecting the process disturbances for the MPC controller were also acceotable for both controlled variables.

关键词： model predictive control fluidized bed reactor propylene polymerization Ziegler-Natta catalyst

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