배열회수보일러 복수예열기 부식 파손 분석
Corrosion Failure Analysis of Condensate Pre-Heater in Heat Recovery Steam Generator
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초록
In this work, we have performed a corrosion failure analysis of a leaking tube connected to an upperheader of a condensate pre-heater in a heat recovery steam generator. It was revealed that the leakage posi tion in the tube was the location where the materials were easily vulnerable due to tensile residual stressesinduced by the material manufacturing process and welding process. In addition to an imbalance in themodule induced by temperature difference during operation of the pre-heater, the weight of the modulesand thermal fatigue provoked a type of stress of tensile-tensile fatigue on the tube. Thus, the leakage posi tion 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 waterside. The cracks propagated along with the degraded microstructure in a transgranular cracking modeunder fatigue loading and finally resulted in water leakage.
Abstract
In this work, we have performed a corrosion failure analysis of a leaking tube connected to an upperheader of a condensate pre-heater in a heat recovery steam generator. It was revealed that the leakage posi tion in the tube was the location where the materials were easily vulnerable due to tensile residual stressesinduced by the material manufacturing process and welding process. In addition to an imbalance in themodule induced by temperature difference during operation of the pre-heater, the weight of the modulesand thermal fatigue provoked a type of stress of tensile-tensile fatigue on the tube. Thus, the leakage posi tion 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 waterside. The cracks propagated along with the degraded microstructure in a transgranular cracking modeunder fatigue loading and finally resulted in water leakage.
참고문헌 (16)
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