Analysis of the Influence of Heat Exchange Surface Fouling on Heat Transfer Performance of U-tube Steam Generator
Corrosion products from the secondary loop system were deposited on the shell side of the U-tube steam generator.Fouling led to heat accumulation on the metal heat exchange tubes,which is easy to cause hot spot corrosion under fouling and harm the safety of equipment.In order to clarify the influ-ence of fouling on the heat transfer performance of steam generators,this study established a distributed model for the U-tube steam generator based on simulation platform APROS,and verified the model accu-racy according to the data in published papers;the relationship between fouling thermal resistance and surface heat transfer coefficient was derived,and the influence of different fouling thickness and positions on the tube wall temperature,fluid temperature,heat transfer coefficient and heat flux in the heat ex-change area of the U-tube steam generator was analyzed.The results show that the heat transfer efficiency of the steam generator decreases and the outlet steam quality decreases with the increase of fouling thick-ness;the effect of fouling on the heat transfer efficiency of boiling section is greater than that of subcool-ing section.
U-tube steam generatorAPROSfoulingheat transfer capability
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