直接空冷凝汽器翅片管污垢层清洗的数值研究

直接空冷凝汽器翅片管作为空冷单元的重要换热组件，翅片管的清洁程度直接影响空冷单元的高效换热能力。目前对如何提高直接空冷凝汽器翅片管换热能力的研究较多，但是对于直接空冷凝汽器翅片管粘有污垢层后的清洗状况鲜见报道。对此，本文对直接空冷凝汽器蛇形翅片管污垢层清洗进行了数值模拟，分析了翅片管表面具有不同厚度的垢层时，在清洗过程中所受到的压力和剪切应力随时间的变化规律。结果表明：清洗带有不同厚度垢层的翅片管，翅片管表面垢层越薄，就越容易清洗，所需清洗时间越短；翅片管表面垢层受到的压力和剪切应力随垢层厚度的减小而减小，随清洗时间的增加而减小；经计算得出，清洗喷嘴的移动速度为1.1～1.5m/min时可更好的清洗翅片管表面的污垢。

Numerical investigation on fouling cleaning of direct air cooled condenser finned tube

Direct air cooled steam condenser finned tube condenser as an important heat exchanger of air cooling unit components.Finned tube directly influences the clean of air cooling unit of efficient heat transfer capability.At present,research on improving the heat transfer capability of finned tube heat exchanger in direct air cooled condenser,at the same time,cleaning condition of the fouling layer are rarely reported.To solve the problem,fouling cleaning process of direct air cooled condenser finned tube was researched by numerical simulation.Finned tube surface was analyzed with different thickness of the filth in the cleaning process of stress and shear stress changing with the time.The results show that:the cleaning filth layer of finned tube with different thickness,the surface filth layer is thin,the easier is to be cleaned,cleaning the shorter the time required.The pressure and shear stress of the filth layer decrease with the decrease of the thickness,and the increase of the cleaning time.As calculated,when cleaning the nozzle's movement speed by 1.1~1.5 m/min can be better clean the dirt on the surface of the finned tube.