Mathematical Model and Advanced control for Gas Phase Olefin Polymerization in Fluidized-Bed Catalytic Reactors

摘要

In this study we present the developments in modeling gas-phase catalyzed olefin polymerization fluidized-bed reactors (FBR) using Ziegler-Natta catalyst. The modified mathematical model to account for mass and heat transfer between the solid particles and the surrounding gas in the emulsion phase is developed in this work to include site activation reaction. This model developed in the present study is subsequently compared with wellknown models, namely, the bubble-growth, well-mixed and the constant bubble size models for porous and non porous catalyst. The results we obtained from the model was very close to the constant bubble size model, wellmixed model and bubble growth model at the beginning of reaction but its overall behavior changed and is closer to the well-mixed model compared with the bubble growth model and constant bubble size model after half an hour of operation. Neural-network based Predictive controller are implemented to control the system and compared with the conventional PID controller, giving acceptable results.