Date of Publication:2016-01-01

Journal:热科学与技术

Issue:1

Page Number:19-25

ISSN No.:1671-8097

Abstract:A simultaneous optimization approach based on stage-wise superstructure was proposed for heat exchanger network retrofit.The presented method does not rely on pinch analysis,and does not require predetermining minimum heat transfer temperature difference.Investment costs in retrofit and operating costs can be optimized simultaneously using the model.The investment costs in retrofit include reassignment cost of existing exchangers,cost of area for existing exchangers and cost of area for new exchangers. This model is a MINLP problem with more optimization variables and constraints,which can be solved efficiently through the proposed two-level method.The network modifications were carried out using genetic algorithm,and the operating parameters were optimized using the particle swarm optimization algorithm.Two case studies are presented to denmonstrate the applicability of the proposed methodology.

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