换热网络优化的换热单元拆分策略

Heat Exchanger Unit Division Strategy of Heat Exchanger Network Optimization

摘要: 固定投资费用和换热单元负荷制约关系的影响随着换热网络优化进程的推进逐步加深，致使优化易陷入局部极值。基于上述原因，本文提出一种可提升个体结构整型变量和连续型变量优化能力的单元拆分策略，该策略将已存单元的部分负荷拆分到与之相关联流股的新生单元，利用结构竞争作用促使换热连接和热负荷配置形成更优选择。采用两种大规模算例验证本文提出的策略，结构进化过程和量化结果表明：策略可有效促进大规模换热网络全局优化的换热关系优选进程，具备良好的跳出局部极值能力，取得了优于已有文献的结果。

Abstract: With the advance of heat exchanger network optimization, the influence of fixed investment cost and heat exchanger load constraint relationship gradually deepens, making the optimization easily fall into the local extremum. Based on the above reasons, this paper proposes a heat exchanger division strategy that can improve the optimization ability of integral and continuous variables of the individual structure. By dividing the heat load of existing heat exchangers, the strategy forces the generation of new heat exchangers associated with their location and makes use of the competitive relationship between heat exchangers to form a better choice of network structure and heat load configuration. Two large-scale examples were used to verify the performance of the strategy, and the structural evolution process and quantitative results show that the strategy can effectively promote the optimal selection of the heat transfer relationship in the global optimization of large-scale heat transfer network, and has a good ability to jump out of the local extremum, and finally get better results of previous literature.