Heat exchanger network synthesis based on directional coordination strategy to improve heat exchange unit optimization
In order to solve the problem of premature elimination of heat exchange units and the difficulty of survival of newly generated heat exchange units when the heat exchanger network is optimized by Random Walk Algorithm with Compulsive Evolution,a directional coordination strategy based on the number of heat exchange units and annual comprehensive cost was proposed.Firstly,target unit number threshold and parallel population number were determined by intelligently ingesting number of heat exchanger units.Secondly,different target units number were assigned to parallel populations.Finally,a dynamic optimization path was designed based on the discrete degree between the actual number of units and the target number of units.The purpose of this method was to avoid the optimization algorithm falling into the local extremum trap due to the limitation of the number of heat exchange units in the optimization process,so that individuals in each parallel population could fully search and optimize the structure of the heat exchanger network under the number of target units,and both local search and global search capabilities of the algorithm could be considered.15SP and 20SP cases were used to verify the results,and the results were 1496744USD/a and 1396596USD/a,respectively.The results were better than those obtained in literature,which proved the effectiveness of the method.
process systemsheat exchanger networkheat exchange unitsalgorithmoptimizationglobal search
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