Total-site heat integration (TSHI) is one of effective ways to improve energy efficiency for the process industry. Generally, the existing chemical plants in an industrial park were rarely constructed simultaneously and it is highly possible that each has already been equipped with an optimal heat exchanger network (HEN) at the time when its construction is completed. To further improve the overall performance of the entire site, a novel retrofit design strategy of these HENs is developed in this study using intermediate fluid(s). A two-stage procedure has been adopted to produce a practicable retrofitting plan. Three different revamp strategies are proposed in this work, while any of them can be applied to generate the cost-optimal designs first via indirect interplant heat exchanges. The benefit allocation schemes are then determined according to core and Shapley values in the second stage. The feasibility and effectiveness of proposed methodology are demonstrated in detail with a three-plant example. It is also plain to observe from the corresponding results that the applicability of the aforementioned design strategy is practicable in realistic environment.

全站点热集成 (TSHI) 是提高过程工业能源效率的有效方法之一。一般来说，工业园区现有的化工厂很少是同时建设的，很有可能每个工厂在建设完成时就已经配备了最佳换热网络（HEN）。为了进一步提高整个场地的整体性能，本研究中使用中间流体开发了这些 HEN 的新型改造设计策略。已采用两阶段程序来制定切实可行的改造计划。在这项工作中提出了三种不同的改造策略，而其中任何一种都可以首先通过间接设备间热交换应用于生成成本最优的设计。然后在第二阶段根据核心值和沙普利值确定福利分配方案。所提出的方法的可行性和有效性通过一个三工厂的例子得到了详细的证明。从相应的结果中也可以明显看出，上述设计策略在现实环境中的适用性是可行的。