关键词: 热能工程, 空冷凝汽器, 蛇形翅片管, 污垢, 清洗过程, 数值模拟

Abstract: 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.

Key words: thermal engineering, air cooled condenser, serpentine finned tube, filth, cleaning process, numerical simulation