Multi-objective constraint control for FCC reactor-regenerator system
Chemical processes are operated within a set of practical constraints and the most profitable operation point lies an the interception of these constraints. Enabling operation to be as close as possible to the optimum point is a challenging advanced control problem. This work is designed to achieve a suitable control strategy for handling constraints in a systematic way and illustrate the effectiveness of the approach by reference to a fluid Catalytic Cracking (FCC) system. Essential features of the proposed approach are: classifying constraints into input and output constraints; handling output constraints using the optimisation layer of the hierarchical control system structure; handling input constraints using the experience of operators. Computational complexity is reduced by handling the different types of constraints differently. In order to enhance the robustness and flexibility of a control system, the approach also tries to keep the openings of the key control valves away from their limits without losing control. (C) 1998 Elsevier Science Ltd. All rights reserved.
constraint control fluid catalytic cracking priority matrix