Numerical Investigation on the Low Temperature Corrosion Characteristics of Flue Gas Heat Exchanger
Low temperature corrosion characteristics on flue gas heat exchanger surfaces are crucial for reliability of equipment operation. Reasonable fin structure and accurate prediction of sulfuric acid vapor can understand corrosion characteristics and enhance performance. In this paper, a coupling numerical model is adopted to predict the condition of sulfuric acid vapor on heat exchanger surfaces. A rectangular type finned tube is employed to analyze the effect of operating parameters on sulfuric acid condensation and corrosion. The results show that fin regions with higher temperature have higher acid solution concentration. Although the increases of water vapor concentration could result in increase of deposition, the increase of flue gas temperature will reduce corrosion risk. The important is the rectangular fin can avoid high corrosion risk on its leading edge. Therefore, rectangular fin may be considered as an alternative scheme without reducing heat transfer performance and elongating the lifespan of individual fin.
KeywordsLow temperature corrosion Condensation Heat exchanger Heat transfer
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