板翅式换热器翅片流阻快速检测系统设计

Development of a measurement system for fast testing the pressure drop characteristics of plate-fin heat exchanger used for air separation

摘要:

铝制钎焊板翅式换热器是一种高效、紧凑式换热器，广泛用于空气分离设备、天然气处理、天然气液化、烯烃装置等石油化工的低温分离装置、hyco装置、氦液化、氢气液化装置及动力机械等。翅片是板翅式换热器的核心部件，其加工质量的下降，会直接导换热器阻力降的升高、传热效率下降，进而造成设备运行能耗的增大。因此，控制加工成型的翅片流阻在一定范围内，是有效保证翅片加工质量的关键。针对传统的基于风机的换热器阻力测试装置雷诺数上限低、试件拆装繁琐、测试效率低等缺点，采用高压气体作为测试气源，配合液压驱动的试件固定装置，开发了一套可实现板翅式换热器翅片流阻快速检测的装置。通过开发基于C#及SQL Server数据库技术的上位机测控软件，实现了测试数据的实时采集、处理和曲线显示。测试实验结果显示，该检测装置系统重复性误差均可保证在3%以内，满足宽雷诺数、高精度的翅片阻力特性测量要求，为实现翅片加工质量检测提供保障。

Abstract:

As compact and high efficiency heat exchangers, plate-fin heat exchangers have been found widely applications in air separation, natural gas liquification, hydrogen liquification, etc. Fin is the most important component of the plate-fin heat exchanger. A poor fin manufacturing quality will directly increase the pressure drop across the heat exchanger, and thus leading to a higher energy consumption of the air separation equipment. Therefore, it is of significant to maintain the pressure drop within a predefined limit for an accepted manufacturing quality. Considering the inadequacies of low Renold number and testing efficiency for the conventional measurement devices, a novel testing system for realizing the fast examining the pressure drop characteristics based on the high-pressure compressed air and hydraulic fixture was developed. A data acquisition system was also developed based on the C# and SQL Server. The experimental results showed that the proposed measurement system could achieve the fast testing the pressure drop characteristics of plat-fin heat exchangers with a reported testing uncertainty of below 3%.