内翅片管换热器换热效率降低分析

内翅片管换热器使用一段时间后,换热效率会降低。主要原因是:波纹型翅片与内管定位不好,引起管内堵塞;内管一端封头的头部很薄,使用一段时间后出现中孔现象,使流体短路,换热系数发生变化;内(外)管和翅片清洗不彻底,使内翅片换热管钎焊部位脱落,影响钎焊质量甚至堵塞通道。详细介绍在内翅片换热管加工过程中对上述三种问题的解决方法。

Analysis of decrease of heat exchange efficiency of inner fin tube heat exchanger

After use for a period of inner fin tube heat exchanger, the heat exchange efficiency decreases, which is mainly attributed to followings： blocking of tube due to improper positioning between the corrugated fin and inner tube; short circuit and change of heat exchange coefficient resulted from middle pores due to thin head of the closure at one end of the inner tube; and poor soldering quality and even blocking of the passage resulted from peeling off soldered location of inner fin heat exchange tube due to incomplete cleaning of inner （outer） tube and fins. Here, the methods used in machining of inner fin heat exchange tube for eliminating the above-mentioned problems are detailed.