Heat Exchanger Network Optimization Based on Inner Utility Placement Strategy

doi:10.19596/j.cnki.1001-246x.7957

Abstract

Abstract: Traditional stage-wised superstructure (SWS) of heat exchanger network allowes that utilities are placed at ends of process streams, which restricts flexible development of network structures. Hence, a novel inner utility placement strategy is proposed, in which utilities could be placed at each stream branch in intermediate stages. An improved random walk algorithm with compulsive evolution with structure-protection strategy (SP-RWCE) is employed, in which a pseudo optimum generation strategy is presented to modify SP-RWCE, where pseudo optimums with evolution potentialities could be promoted and generated to accept protection and exploitation by expanding optimal total annual cost of individuals in long-term evolution stagnation. Optimization results of three benchmark cases are superior to reported values, all of them include inner utilities. It indicates that the modified SWS enlarges solution space, the improved SP-RWCE has stronger search ability, and the placement of inner utility could effectively reduce heat exchange areas.

Key words: heat exchanger network, optimization, stage-wised superstructure model, inner utility, random walk algorithm with compulsive evolution

CLC Number:

TK124

BAO Zhongkai, CUI Guomin, CAO Chong, REN Jie, LI Menghong. Heat Exchanger Network Optimization Based on Inner Utility Placement Strategy[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2019, 36(6): 707-718.

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