Optimization and Control of FCCU Supplementary Absorbent Flow

The steady and dynamic process simulation based on 0.6 Mt/a FCCU absorption and stabilization system were established with UniSim Design software.For the goal of minimization of energy cost,operation optimization of supplementary absorbent flow was done on the basis of steady model while satisfying the product within quality restriction.The result above was realized by the means of control system in the dynamic model.By experiments analysis,in order to ensure quality not exceeding during the implementation process of optimization,the product quality index should be taken as controlled variable.The performance of multi-variable prediction control is better than that of single-loop control,but the latter one can be improved if the change of supplementary absorbent flow is divided into several times.