DOI QR코드

DOI QR Code

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))
  • 투고 : 2021.06.29
  • 심사 : 2021.09.20
  • 발행 : 2021.10.31

초록

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.

키워드

참고문헌

  1. N. S. Harding and D. C. O'Connor, Ash deposition impacts in the power industry, Fuel Processing Technology, 88, 1082, (2007), Doi: https://doi.org/10.1016/j.fuproc.2007.06.018
  2. S. S. Chatha, H. S. Sidhu, and B. S. Sidhu, High temperature hot corrosion behaviour of NiCr and Cr3C2-NiCr coatings on T91 boiler steel in an aggressive environment at 750 ℃, Surface and Coatings Technology, 206, 3839, (2012). Doi: https://doi.org/10.1016/j.surfcoat.2012.01.060
  3. E. Labuda, K. J. Shields, and D. A. Cline, Corrosion, Fireside corrosion in coal-and oil-fired units: failure mechanisms and methods of prevention, p. 00234, Florida (2000).
  4. W. Stichel, Handbook of comparitative world steel standards; vol. 48, no. 6, American Society for Testing and Materials, PA, USA (1996).
  5. M. Asnavandi, M. Kahram, M. Rezaei, and D. Rezakhani, Fire-Side Corrosion: A Case Study of Failed Tubes of a Fossil Fuel Boiler, International Joursnal of Corrosion, 2017, 1, (2017). Doi: https://doi.org/10.1155/2017/7367046
  6. H. Tran, P. Centre, and A. Chemistry, RECOVERY BOILER FIRESIDE DEPOSITS AND PLUGGING, pp. 1-13, [Online]. Available: https://www.tappi.org/globalassets/documents/awards/4-7.pdf
  7. W. T. Reid, External corrosion and deposits; boilers and gas turbines, Elsevier Ltd., New York (1971).
  8. J. Purbolaksono, F. Tarlochan, M. M. Rahman, N. F. Nordin, and B. Ahmad, Failure investigation on reheater tube due to deposit and wall thinning, Journal of Failure Analysis and Prevention, 9, 365 (2009). Doi: https://doi.org/10.1007/s11668-009-9250-1
  9. S. W. Liu, W. Z. Wang, and C. J. Liu, Failure analysis of the boiler water-wall tube, Case Studies in Engineering Failure Analysis, 9, 35 (2017). Doi: https://doi.org/10.1016/j.csefa.2017.06.002
  10. M. C. Fatah, D. T. Putra, and B. A. Kurniawan, Failure investigation of high temperature cast soot blower lance tube nozzle, Journal of Failure Analysis and Prevention, 20, 1124 (2020). Doi: https://doi.org/10.1007/s11668-020-00914-w