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《CIESC Journal》 2011-10
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Optimal grade transition in polymerization processes under uncertainty

ZHANG Weijie,LIANG Jun,FEI Zhengshun,YE Lubin(State Key Laboratory of Industrial Control Technology,Institute of Industrial Control,Zhejiang University,Hangzhou 310027,Zhejiang,China)  
Grade transition is quite common in the polymerization process due to diversified market demands.Optimal grade transition could minimize the amount of off-specification polymer and transition time while meeting operational and safety requirements.Numerical optimization based on the nominal model is typically insufficient due to its uncertainty.A kind of close-loop approach based on tracking the necessary condition of optimality(NCO-tracking)was used in the polymerization process.The solution model generated from the nominal optimal solution was of great significance in NCO-tracking.This paper presents a new method for extracting the solution model.In this method the requirements from the decentralized control scheme was considered by solving a series of small-scale optimization problems.It was shown that a significantly simplified solution model could be generated and grade transition was successful in the presence of uncertainty in the forms of model mismatch and process disturbance.
【Fund】: 国家自然科学基金项目(60574047);; 国家高技术研究发展计划项目(2007AA04Z168 2009AA04Z154);; 教育部博士点基金项目(20050335018)~~
【CateGory Index】: TQ325.1;O224
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【Citations】
Chinese Journal Full-text Database 2 Hits
1 FEI Zhengshun,HU Bin,YE Lubin,ZHENG Pingyou,LIANG Jun(State Key Laboratory of Industrial Control Technology,Institute of Industrial Control,Zhejiang University,Hangzhou 310027,Zhejiang,China);Optimal grade transition of polymerization process with path constraints[J];CIESC Journal;2010-04
2 LI Wen-yi,REN Cong-jing,WANG Jing-dai,YANG Yong-rong (State Key Laboratory of Chemical Engineering,Zhejiang University,Hangzhou 310027,China);Optimization of grade transition for continuous propylene polymerization process using continuous stir reactor in series technology[J];Journal of Zhejiang University(Engineering Science);2010-02
【Secondary Citations】
Chinese Journal Full-text Database 4 Hits
1 LIANG\ Jun Institute of System Engineering, Department of Control Science and Engineering National Lab\;of Industrial Control Tech.Zhejiang University Hangzhou, 310027, P. R. China;Measurements of Quality Variables for an Industrial Rolling Mill Reheating Furnace (I)[J];Journal of Transcluction Technology;2003-01
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4 WANG Xiao-yong1, LIANG Jun1, LIU Yu-ming1, WANG Wen-qing2 (1.National Key Laboratory of Industrial Control Technology, Institute of Systems Engineering, Zhejiang University, Hangzhou 310027, China; 2.Plastic Plant, Qilu Petrochemical Co. Ld., Zibo 255400, China);Recursive PLS based adaptive soft-sensor model and its application[J];Journal of Zhejiang University(Engineering Science);2005-05
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