Energy integration of the existing chemical and petrochemical facilities is regarded as a keystone for sustainable energy systems. It is widely known that a considerable number of the petrochemical industries are not applying efficient heat exchanger network (HEN) systems to minimise the use of external utilities. In the present study, a Pinch Analysis-based graphical approach is used to retrofit an existing HEN for optimising a crude oil distillation operation. The existing HEN is represented using T_hot–T_cold diagram, where the cold stream temperatures are plotted on the x-axis and the hot stream temperatures are plotted on the y-axis, for each exchanger unit. The graphical approach is applied to a real case study of a petroleum refinery plant located in Kuwait with the objective of performing energy analysis and retrofitting the existing HEN. Retrofit modifications are extracted from the graphical representation to enable scenarios for energy and emission reduction. The application of the proposed approach resulted in substantial energy savings of about 10.4 MW compared to the current operation, leading to annual operating cost savings of about MM$2 and less than one-year payback time. Overall, this study provides tools to address the energy traits in crude preheat trains of industrial feature, which can improve the overall economic–environmental sustainability of existing refineries.

现有化学和石化设施的能源整合被认为是可持续能源系统的基石。众所周知，许多石化工业没有采用高效的热交换器网络（HEN）系统来最大程度地减少对外部公用事业的使用。在本研究中，基于捏分析的图形方法用于改造现有的HEN，以优化原油蒸馏操作。现有的HEN用T _hot - T _cold表示图，其中每个交换器单元的冷流温度在x轴上绘出，而热流温度在y轴上在绘图上。图形方法应用于位于科威特的一家石油精炼厂的实际案例研究，目的是进行能源分析和改造现有的HEN。从图形表示中提取改造修改，以实现节能减排的方案。与目前的运行方式相比，所建议方法的应用节省了大约10.4兆瓦的能源，导致每年的运行成本节省了大约2缅甸元，而且还不到一年的投资回收期。总体而言，这项研究为解决具有工业特征的粗制预热列车中的能源特性提供了工具，