关键词: 纵翅片换热管, 百叶窗, 烟气侧, 数值模拟

Abstract: Longitudinal finned tube heat exchanger is a new type of tube heat exchanger used in flue gas heat recovery. In order to improve the heat transfer efficiency，the structural model of a new type of longitudinal louvered fin tubes was proposed and simplified. Using Fluent Software，the process of flow and heat transfer in gas phase was simulated for the longitudinal louver fined heat exchangers，and the transfer efficiency and pressure drop of two types of longitudinal louver fin and the common type exchanger were compared. The results showed that the heat transfer efficiency of longitudinal louvered fin heat transfer were over 130% higher than that of the common type. This paper simulates the changes of transfer and pressure drop at six different inlet velocities，and analyzed the influences of heat transfer and pressure drop caused by the difference of spacing and inclination angles on longitudinal louver fin. The results showed that at higher inlet velocities， the range of temperature was smaller，and the pressure drop was bigger. At bigger spacing the range of temperature and pressure drop were both smaller. Bigger inclination angles resulted in bigger pressure drop，but had little impact on heat exchange effects.

Key words: longitudinal fin transfer, louver fin, in sides of gas flow, numerical simulation