DOI QR코드

DOI QR Code

High-Temperature Corrosion Characterization for Super-Heater Tube under Coal and Biomass Co-firing Conditions

석탄-바이오매스 혼소에 따른 슈퍼히터 튜브 고온 부식 특성 연구

  • Park, Seok-Kyun (Korea Institute of Industrial Technology) ;
  • Mock, Chin-Sung (Korea Institute of Industrial Technology) ;
  • Jung, Jin-Mu (Division of Mechanical Design Engineering, Chonbuk National University) ;
  • Oh, Jong-Hyun (Division of Mechanical Design Engineering, Chonbuk National University) ;
  • Choi, Seuk-Cheun (Thermochemical Energy System Group, Korea Institute of Industrial Technology)
  • 박석균 (한국생산기술연구원) ;
  • 목진성 (한국생산기술연구원) ;
  • 정진무 (전북대학교 기계설계공학) ;
  • 오종현 (전북대학교 기계설계공학) ;
  • 최석천 (한국생산기술연구원 고온에너지 시스템그룹)
  • Received : 2017.12.05
  • Accepted : 2018.02.02
  • Published : 2018.02.28

Abstract

Many countries have conducted extensive studies for biomass co-firing to enhance the durability of reactor on high-temperature corrosion. However, due to the complicated mechanisms of biomass co-firing, there have been limitations in accurately determining the current state of corrosion and predicting the potential risk of corrosion of power plant. In order to solve this issue, this study introduced Lab-scale corrosion system to analyze the corrosion characteristics of the A213 T91 material under the biomass co-firing conditions. The corrosion status of the samples was characterized using SEM/EDS analysis and mass loss measurement according to various biomass co-firing conditions such as corrosion temperature, $SO_2$ concentration, and corrosion time. As a result, the corrosion severity of A213 T91 material was gradually increased with the increase of $SO_2$ concentration in the reactor. When $SO_2$ concentration was changed from 0 ppm to 500 ppm, both corrosion severity and oxide layer thickness were proportionally increased by 15% and 130%, respectively. The minimum corrosion was observed when the corrosion temperature was $450^{\circ}C$. As the temperature was increased up to $650^{\circ}C$, the faster corrosion behavior of A213 T91 was observed. A213 T91 was observed to be more severely corroded by the effect of chlorine, resulting in faster corrosion rate and thicker oxide layer. Interestingly, corrosion resistance of A213 T91 tended to gradually decrease rather than increases as the oxide layer was formed. The results of this study is expected to provide necessary research data on boiler corrosion in biomass co-firing power plants.

Keywords

References

  1. Electric Power Statistics Information System, http://epsis.kpx.or.kr.
  2. J. H. Seo, S. J. Kim, M. H. Jung and B. T. Kim, 2014, "Finite Element Analysis for the Behavior of the Casing of a Pulverizer Mill Planetary Gear Reducer", Journal of the Korean Society for Power System Engineering, Vol. 18, No. 6, pp. 34-39. https://doi.org/10.9726/kspse.2014.18.6.034
  3. United States Environmental Protection Agency: www.epa.gov.
  4. R. A. Antunes and M. C. L. de Oliveira, 2013, "Corrosion in biomass combustion: A materials selection analysis and its interaction with corrosion mechanisms and mitigation strategies", Corrosion Science, Vol. 76, pp. 6-26. https://doi.org/10.1016/j.corsci.2013.07.013
  5. L. Nunes, J. Matias and J. Catalao, 2016, "Biomass combustion systems: A review on the physical and chemical properties of the ashes, Renewable and Sustainable Energy Reviews", Vol. 53, pp. 235-242. https://doi.org/10.1016/j.rser.2015.08.053
  6. I. Pisa and G. Lazaroiu, 2012, "Influence of co-combustion of coal/biomass on the corrosion", Fuel Processing Technology, Vol. 104, pp. 356-364. https://doi.org/10.1016/j.fuproc.2012.06.009
  7. J. Metsajoki, E. Huttunen-Saarivirta and T. Lepisto, 2014, "Elevated-temperature corrosion of uncoated and aluminized 9-12% Cr boiler steels beneath KCl deposit", Fuel, Vol. 133, pp. 173-181. https://doi.org/10.1016/j.fuel.2014.05.017
  8. J. H. Moon, J. S. Yu, H. J. Kim and N. J. Cho, 2012, "Design of Scroll Expander for Electric Power Generation System using Organic Rankine Cycle with Biomass Energy Source", Journal of the Korean Society for Power System Engineering, Vol. 16, No. 4, pp. 30-35.
  9. L. A. Hansen, H. P. Nielsen, F. J. Frandsen, K. Dam-Johansen, S. Horlyck and A. Karlsson, 2000, "Influence of deposit formation on corrosion at a straw-fired boiler", Fuel Processing Technology, Vol. 10, pp. 189-209.
  10. A. T. Masia, B. Buhre, R. Gupta and T. Wall, 2007, "Characterising ash of biomass and waste", Fuel Processing Technology, Vol. 88, pp. 1071-1081. https://doi.org/10.1016/j.fuproc.2007.06.011
  11. Lee, N. H., Kim, S., Choe, B. H., Yoon, K. B., & Kwon, D. I. (2009). Failure analysis of a boiler tube in USC coal power plant. Engineering Failure Analysis, Vol. 16, No.7, pp. 2031-2035. https://doi.org/10.1016/j.engfailanal.2008.12.006
  12. M. Zevenhoven, P. Yrjas, B.-J. Skrifvars and M. Hupa, 2012, "Characterization of ash-forming matter in various solid fuels by selective leaching and its implications for fluidized-bed combustion", Energy & Fuels, Vol. 26, pp. 6366-6386. https://doi.org/10.1021/ef300621j
  13. H. P. Nielsen, F. J. Frandsen and K. Dam-Johansen, 1999, "Lab-scale investigations of high-temperature corrosion phenomena in straw-fired boilers", Energy & Fuels, Vol. 13, pp. 1114-1121. https://doi.org/10.1021/ef990001g
  14. K. Natesan and J. Park, 2007, "Fireside and steamside corrosion of alloys for USC plants, International Journal of Hydrogen Energy", Vol. 32, pp. 3689-3697. https://doi.org/10.1016/j.ijhydene.2006.08.038
  15. T. Varis, D. Bankiewicz, P. Yrjas, M. Oksa, T. Suhonen, S. Tuurna, K. Ruusuvuori and S. Holmstrom, 2015, "High temperature corrosion of thermally sprayed NiCr and FeCr coatings covered with a KCl-K2SO 4 salt mixture, Surface and Coatings Technology", Vol. 265, pp. 235-243. https://doi.org/10.1016/j.surfcoat.2014.11.012
  16. M. Spiegel, A. Zahs and H. Grabke, 2003, "Fundamental aspects of chlorine induced corrosion in power plants", Materials at high temperatures, Vol. 20, pp. 153-159. https://doi.org/10.1179/mht.2003.018
  17. J. M. Abels and H. H. Strehblow, 1997, "A surface analytical approach to the high temperature chlorination behaviour of inconel 600 at $700^{\circ}C$", Corrosion Science, Vol. 39, pp. 115-132. https://doi.org/10.1016/S0010-938X(96)00112-6