Supply and Target Based Superstructure Synthesis of Heat and Mass Exchange Networks.

Abstract

This paper present new methods of optimization of superstructures involving heat exchanger network (HENs) and mass exchanger networks (MENs). The techniques develop in this study explore the used of key variables (namely supply temperatures/compositions and target temperatures /compositions) in HENs and MENs to define the intervals of superstructures. Such superstructures are modeled as mixed integer non linear programmes (MINLP) with the objectives of minimisation of the total annual cost (TAC) for each networks. The superstructures presented in this paper are derivatives of the interval and supply based superstructures (IBMS and SBS) developed previously. Two different superstructures are developed in this paper: the first uses the supply temperature/composition of hot/rich streams and the target temperature/composition of cold/lean streams (denote target and supply based superstructure, T&SBS). Five HEN examples and three MEN examples are presented. The results obtained compare well with those in the literature.