A modified DIRECT algorithm for hidden constraints in an LNG process optimization

作者: Jonggeol Na , Youngsub Lim , Chonghun Han

DOI: 10.1016/J.ENERGY.2017.03.047

关键词:

摘要: Abstract Optimization for process design in the chemical engineering industry has been important energy efficiency and economic feasibility. Because many industries perform optimization with a commercial simulator such as Aspen HYSYS, an methodology expensive black-box functions is needed. Thus, development of derivative free algorithms long studied deterministic global search algorithm DIRECT (DIviding hyper-RECTangle) was suggested. In this paper, modified sub-dividing step considering hidden constraints proposed. The effectiveness exemplified by its application to cryogenic mixed refrigerant using single natural gas liquefaction comparison well-known stochastic (GA, PSO, SA), model based (SNOBFIT), local solver (GPS, GSS, MADS, active-set, interior-point, SQP), other constraint handling methods, including barrier approach neighborhood assignment strategy. Optimal solution calculated proposed decreases specific power required 18.9% compared base case.

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