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http://dx.doi.org/10.14773/cst.2021.20.2.69

Corrosion Failure Analysis of Condensate Pre-Heater in Heat Recovery Steam Generator  

Chae, Hobyung (Department of Materials Science and Engineering, Chungnam National University)
Kim, Woo Cheol (R&D Institute, Korea District Heating Corp.)
Kim, Heesan (Department of Materials Science and Engineering, Hongik University)
Kim, Jung-Gu (School of Advanced Materials Science and Engineering, Sungkyunkwan University)
Kim, Kyung Min (R&D Institute, Korea District Heating Corp.)
Lee, Soo Yeol (Department of Materials Science and Engineering, Chungnam National University)
Publication Information
Corrosion Science and Technology / v.20, no.2, 2021 , pp. 69-76 More about this Journal
Abstract
In this work, we have performed a corrosion failure analysis of a leaking tube connected to an upper header of a condensate pre-heater in a heat recovery steam generator. It was revealed that the leakage position in the tube was the location where the materials were easily vulnerable due to tensile residual stresses induced by the material manufacturing process and welding process. In addition to an imbalance in the module induced by temperature difference during operation of the pre-heater, the weight of the modules and thermal fatigue provoked a type of stress of tensile-tensile fatigue on the tube. Thus, the leakage position of the pre-heater was exposed to the tensile stress on the inner surface of the tube facing the gas, which rendered the unstable oxide layer susceptible to corrosion and the formation of pits on the water side. The cracks propagated along with the degraded microstructure in a transgranular cracking mode under fatigue loading and finally resulted in water leakage.
Keywords
Heat Recovery Steam Generator; Condensate Pre-Heater; Corrosion; Fatigue;
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