Sulfuric acid deposition characteristics of H-type finned tube bank with 10 rows

Abstract

Abstract The deposition rate and condensate mass fraction of sulfuric acid on heat exchanger surfaces play a decisive role on the local low-temperature corrosion of heat exchangers. Based on the prediction model of acid deposition, a three-dimensional numerical simulation was performed for acid deposition characteristics of H-type finned tube bank with 10 rows. The effect of six geometric parameters (spanwise tube pitch, longitudinal tube pitch, fin height, fin pitch, fin thickness and slit width) and Reynolds number are examined. It can be observed that the fin thickness and Reynolds number have the most significant effect on acid deposition. A large fin thickness will greatly increase the risks of fin corrosion, and it is not recommended for practical use. According to the calculation results, a correlation of Sh number of sulfuric acid vs fin geometries for the 10-row tube bundle is presented.