Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Failure Investigation of Fire-Side Water-Wall Tube Boiler

  • Fatah, M.C. (Mechanical Engineering Department, Institut Teknologi PLN (IT PLN)) ;
  • Agustiadi, D. (Mechanical Engineering Department, Institut Teknologi PLN (IT PLN)) ;
  • Pramono, A.W. (Mechanical Engineering Department, Institut Teknologi PLN (IT PLN))
  • Received : 2021.06.29
  • Accepted : 2021.09.20
  • Published : 2021.10.31
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Abstract

Unforeseen failures of boilers in power plants may affect the continuation of electricity generation. Main failures in boilers are influenced by the tube material, tube position, boiler service temperature and pressure, and chemical composition of the feed water and coal. This investigation was intended to find answers on the causes and mechanism of failure of the fire-side boiler water-wall tubes, due to perforation and corrosion. The tube conformed to the material requirements in terms of its chemical composition and hardness. Microscopic examination showed ferrite and pearlite indicating no changes in its microstructure due to the temperature variation. SEM test showed a single layer and homogenous film density particularly on the area far from perforation. However, layers of corrosion product were formed on the nearby perforation area. EDX showed that there were Na, Ca, S, and O elements on the failed surface. XRD indicated the presence of Fe2O3 oxide. The failure mechanism was identified as a result of significant localized wall thinning of the boiler water wall-tube due to oxidation.

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References

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