关键词: 多时期设计, 数学规划模型, 换热网络, 分时共享机制, 管线成本

Abstract: With seasonal changes in demands，supplies and operating conditions of a chemical process，the heat exchanged also varies. Due to the different needs of heat exchange in different periods，multi- period heat exchanger network design has been widely studied. Firstly，this paper describes the use of simultaneous optimization method to establish mathematical programming model in each period separately. We can obtain the single period optimal heat exchanger network design by using GAMS software to solve the models. Secondly，in order to reduce the cost of equipment investment after integrating the heat exchanger networks in different periods，we can use a time-sharing mechanism to design all heat exchange matches which participate in the network，but this practice will increase pipeline cost. Finally，To overcome the drawback of the increased pipeline cost bringing from the time-sharing mechanism，this paper proposes an optimization model of pipeline length. Building and solving the model shows that it not only minimizes pipeline cost，but also gives the location of the heat exchanger，and optimizes the network structure ultimately.

Key words: multi-period design, mathematical programming model, heat exchanger network, timesharing mechanism, pipeline cost