CIESC Journal ›› 2014, Vol. 65 ›› Issue (4): 1303-1309.doi: 10.3969/j.issn.0438-1157.2014.04.021

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Tradeoff between whole margin and control performance for chemical process

XU Feng, JIANG Huirong, WANG Rui, LUO Xionglin   

  1. Research Institute of Automation, China University of Petroleum, Beijing 102249, China
  • Received:2013-07-18 Revised:2013-09-22 Online:2014-04-05 Published:2013-11-27
  • Supported by:

    supported by the National Natural Science Foundation of China (21006127), the National Basic Research Program of China (2012CB720500) and the Science Foundation of China University of Petroleum, Beijing (KYJJ2012-05-28).

Abstract: The whole margin of a chemical process can be evaluated by the economic benefits of operation optimization, and based on steady-state optimization and dynamic optimization it can be further divided into control margin for dynamic operation and process margin for achievable economic benefits, both of which are relevant to control performance of the chemical process. In this paper, multi-objective dynamic optimization was implemented for a chemical process with design margin, whose optimization objectives were the achievable economic benefits of operating point and the control performance of dynamic process. The control structure described by 0-1 variables and control parameters were the optimization variables to form a mixed-integer dynamic optimization. Constrained NSGA-Ⅱ was used to solve the multi-objective dynamic optimization problem. Based on the Pareto optimal solution set, the relationship between control margin, process margin and control performance was analyzed. The case study of FCCU showed that, for a chemical process with design margin, when control performance was improved, the process would need more control margin but less process margin, which meant less achievable economic benefits from operation optimization. Through the trade-off between control margin and process margin, an optimum operating point and control scheme could be found to fulfill both process and control demand.

Key words: whole margin, control performance, operation optimization, multi-objective optimizationn

CLC Number: 

  • TQ021.8
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