Recent years have seen considerable advancement in cryogenic technology. Air separation devices have used the cold box with heat exchanger plate-fin (PFHE) in numerous applications. Cryogenic technologies are used in many industrial processes to recover heat and reduce energy consumption. The multistream plate-fin heat exchanger (MSPFHE) is heavily utilized in the air separation plant’s (ASU) design. The plate-fin heat exchanger, one of the most important applications in the cryogenic industry, is the focus of the current investigation. The air entering this operation has been cooled by utilizing energy from streams originating from the distillation tower in the air separation unit (ASU) to reduce energy usage. The project aims to develop and create a multistream plate-fin heat exchanger (MSPFHE) that may be used in the cold box of an air separation unit practically and without limitations. The pinch technique, a method based on the usage of composite curves, was used in the creation of MSPFHE. With pinch technology, it is possible to divide a multistream exchanger into block portions that represent enthalpy intervals and identify the entry and departure sites for the streams. The correlations used in the MSPFHE thermal design model were first modeled and compared to earlier models as part of this effort. This model has been turned into MATLAB code and utilized in two case studies to yield acceptable results during the sizing step. Calculations of thermodynamic properties, heat transfer, pressure drop, choice of fin type, and final heat exchanger size were all part of the design of the MSPFHE. Finally, based on the software’s ability to reproduce the identical environmental conditions nature produces, the case study results have been validated using Aspen EDR. These findings were matched to findings from the literature and determined to be reliable and consistent.

中文翻译：

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利用夹送技术对空气分离装置中的多流板翅式换热器进行建模和设计

近年来，低温技术取得了长足的进步。空气分离装置在许多应用中都使用了板翅式热交换器冷箱 (PFHE)。许多工业过程中都使用低温技术来回收热量并减少能源消耗。多流板翅式换热器 (MSPFHE) 在空气分离设备 (ASU) 的设计中得到大量应用。板翅式换热器是低温工业中最重要的应用之一，也是当前研究的重点。进入该操作的空气已利用来自空气分离装置 (ASU) 蒸馏塔的气流的能量进行冷却，以减少能源使用。该项目旨在开发和创建一种多流板翅式换热器（MSPFHE），可实际且不受限制地用于空气分离装置的冷箱。夹点技术是一种基于复合曲线使用的方法，用于创建 MSPFHE。利用夹点技术，可以将多流交换器划分为代表焓区间的块部分，并识别流的入口和离开位置。作为这项工作的一部分，首先对 MSPFHE 热设计模型中使用的相关性进行了建模，并与早期模型进行了比较。该模型已转换为 MATLAB 代码，并在两个案例研究中使用，以在调整步骤中产生可接受的结果。热力学特性、传热、压降、翅片类型的选择和最终热交换器尺寸的计算都是 MSPFHE 设计的一部分。最后，基于该软件重现自然产生的相同环境条件的能力，案例研究结果已使用 Aspen EDR 进行了验证。这些发现与文献中的发现相匹配，并被确定为可靠且一致的。