A Novel Close-loop Strategy for Integrating Process Operations of Fluidized Catalytic Cracking Unit with Production Planning Optimization

Abstract

Abstract: Production planning models generated by common modeling systems do not involve constraints for process operations,and a solution optimized by these models is called a quasi-optimal plan.The quasi-optimal plan cannot be executed in practice some time for no corresponding operating conditions.In order to determine a practically feasible optimal plan and corresponding operating conditions of fluidized catalytic cracking unit(FCCU),a novel close-loop integrated strategy,including determination of a quasi-optimal plan,search of operating conditions of FCCU and revision of the production planning model,was proposed in this article.In the strategy,a generalized genetic algorithm(GA) coupled with a sequential process simulator of FCCU was applied to search operating conditions implementing the quasi-optimal plan of FCCU and output the optimal individual in the GAsearch as a final genetic individual.When no corresponding operating conditions were found,the final genetic individual based correction(FGIC) method was presented to revise the production planning model,and then a new quasi-optimal production plan was determined.The above steps were repeated until a practically feasible optimal plan and corresponding operating conditions of FCCU were obtained.The close-loop integrated strategy was validated by two cases,and it was indicated that the strategy was efficient in determining a practically executed optimal plan and corresponding operating conditions of FCCU.

Key words: production planning, process operations, fluidized catalytic cracking unit, integrated strategy

摘要： Production planning models generated by common modeling systems do not involve constraints for process operations,and a solution optimized by these models is called a quasi-optimal plan.The quasi-optimal plan cannot be executed in practice some time for no corresponding operating conditions.In order to determine a practically feasible optimal plan and corresponding operating conditions of fluidized catalytic cracking unit(FCCU),a novel close-loop integrated strategy,including determination of a quasi-optimal plan,search of operating conditions of FCCU and revision of the production planning model,was proposed in this article.In the strategy,a generalized genetic algorithm(GA) coupled with a sequential process simulator of FCCU was applied to search operating conditions implementing the quasi-optimal plan of FCCU and output the optimal individual in the GAsearch as a final genetic individual.When no corresponding operating conditions were found,the final genetic individual based correction(FGIC) method was presented to revise the production planning model,and then a new quasi-optimal production plan was determined.The above steps were repeated until a practically feasible optimal plan and corresponding operating conditions of FCCU were obtained.The close-loop integrated strategy was validated by two cases,and it was indicated that the strategy was efficient in determining a practically executed optimal plan and corresponding operating conditions of FCCU.

关键词: production planning, process operations, fluidized catalytic cracking unit, integrated strategy

WANG Ruqiang, LI Chufu, HE Xiaorong, CHEN Bingzhen. A Novel Close-loop Strategy for Integrating Process Operations of Fluidized Catalytic Cracking Unit with Production Planning Optimization[J]. , 2008, 16(6): 909-915.

王如强, 李初福, 何小荣, 陈丙珍. A Novel Close-loop Strategy for Integrating Process Operations of Fluidized Catalytic Cracking Unit with Production Planning Optimization[J]. , 2008, 16(6): 909-915.

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