基于换热器分时共享机制的多时期换热网络结构设计

随着季节性的供需变化和化工过程中操作条件的变化，换热量也随之变化。由于不同时期换热需求的不同，多时期换热网络的设计得到了广泛的研究。本文首先介绍利用同步优化方法对每个时期单独进行数学规划模型的建立，运用GAMS软件求解得到单时期最优的换热网络设计；其次，为了减少不同时期换热网络整合后设备的投资成本，可采用一种分时共享机制对换热网络中所有参与热交换的匹配进行设计，然而该设计会带来管线成本的增加；最后，针对分时共享机制带来的管线成本的增加，提出了一种管线长度的优化模型，通过对模型的建立和求解，不仅可以得到换热网络中最少的管线成本，还可以给出换热器的最佳放置位置，优化了网络 结构。

A multi-period HEN structure design based on heat exchanger timesharing mechanism

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.