关键词: 热交换器;温度;流量;网络分析技术;化学过程

Abstract: A new superstructure model of heat exchanger networks (HEN) with stream splits based on
rangers of streams supply temperatures and heat capacity flow rates is presented. The
simultaneous optimal mathematical model of flexible HEN synthesis is established too.
Firstly, the streams with rangers of supply temperatures and/or the streams with the
rangers of heat capacity flow rates are pretreated; Secondly, several rules are proposed to
establish the superstructure model of HEN with splits and the simultaneous optimal
mathematical model of flexible HEN; Thirdly, the improving genetic algorithm is applied to
solve the mathematical model established at the second step effectively, and the original
optimal structure of HEN based on the maximum operation limiting condition can be obtained
easily; Finally, the rules of heat exchange unit merged and the heat load of heat exchanger
relaxed are presented, the flexible configuration of HEN satisfied the operation condition
between the upper and down bounds of supply temperature and heat capacity flow rates can be
obtained based on the original optimal structure of HEN by means of these rules. A case
study demonstrates the method presented in this paper is effective

Key words: flexible heat exchanger networks, synthesis, simultaneous optimization, superstructure model