低温多股流板翅式换热器设计优化方法研究进展

针对多股流体流动换热、复杂翅片结构优化、多重通道排布匹配以及低温工程应用等特点，本文归纳分析了低温多股流板翅式换热器结构设计中凸显的流股换热匹配、通道分配排列、多物理场叠加以及低温特殊工况下的应用等问题。总结了在通道结构优化与零部件设计中，通过翅片通道传热流动特性及相关性能评价方法来指导结构选型。文章还深入分析国内外现状，讨论了板翅式换热器的研究热点与发展方向。文章指出低温多股流板翅式换热器应用于大型空分等石化工业流程中优势明显，可显著提高气体液化率，降低实际能耗，进而提升系统运行效率。因此，对于实际应用中可能遇到的设计问题，应考虑结合局部换热网络与多流股匹配、翅片结构设计与通道排列算法优化、多场仿真与试验研究等手段形成合理优化方法和设计框架，来摆脱目前传统经验试凑所带来的限制。

Research progress of cryogenic multi-stream plate-fin heat exchanger on design and optimization method

Aiming at the characteristics of multi-stream flow heat transfer, complex fin structure optimization, multiple channel configuration matching, and cryogenic engineering application, this study summarizes several problems in the thermal design of multi-stream plate-fin heat exchanger (MPHE), such as heat transfer matching, layer pattern, multi-physical field superposition, and special cryogenic operating condition. In the layer structure design and optimization, the heat-transfer flow characteristics and related performance evaluation methods of the fins are summarized to provide guidance for the structural selection. The current research hotspots and development directions of plate-fin heat exchangers are discussed according to the present situations. The results show that MPHE has great advantages in large-scale air separation and petrochemical industries, which can significantly improve the operation efficiency through increasing the gas liquefaction rate and reducing the actual energy consumption. Therefore, the local heat exchange network and multi-stream matching should be combined with the fin structure design and layer algorithm optimization using the multi-field simulation and experimental research to overcome the design problems occurred in practice. This comprehensive and efficient optimization design method can be formed to get rid of the limitations of traditional empirical design.