Failure Analysis of Water Wall Tubes of Coal-Fired Boiler 


Vol. 39,  No. 4, pp. 8-14, Aug.  2024
10.14341/JKOSOS.2024.39.4.8


  Abstract

This work presents a failure analysis for a boiler water-wall tube. The causes of failure were investigated using various methods, such as visual inspection, chemical analysis, optical microscopy, scanning electron microscopy, and energy dispersive spectroscopy. The fractured tubes exhibited little wall thinning on the outside and the fire-facing sides when the thicknesses of the tube walls were taken. Upon visual inspection, lamination lines were observed in the middle of the fracture surface. The line was located at the center between the brittle fracture region of the inner part and the ductile fracture region of the outer part. All material-specification-related requirements were satisfied, given the chemical composition of the tube material. Micro-fissures were observed along the grain boundary in the inner part of the tube near the fracture and crack. Although the micro-fissures were far from the fracture crack, they were still visible in the decarburized layer of the inner surface of the tube. Therefore, it can be concluded that hydrogen damage was the cause of the fracture in the water-wall tube.

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  Cite this article

[IEEE Style]

표종찬, 오제성, 안용식, "Failure Analysis of Water Wall Tubes of Coal-Fired Boiler," Journal of the Korean Society of Safety, vol. 39, no. 4, pp. 8-14, 2024. DOI: 10.14341/JKOSOS.2024.39.4.8.

[ACM Style]

표종찬, 오제성, and 안용식. 2024. Failure Analysis of Water Wall Tubes of Coal-Fired Boiler. Journal of the Korean Society of Safety, 39, 4, (2024), 8-14. DOI: 10.14341/JKOSOS.2024.39.4.8.

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