Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Investigating the Cause of Ash Deposition and Equipment Failure in Wood Chip-Fueled Cogeneration Plant

우드칩을 연료로 하는 열병합발전소의 회분 퇴적 및 설비 고장 원인 분석

  • Min Ji Song (Department of Materials Science and Engineering, Chungnam National University) ;
  • Woo Cheol Kim (Plant Management & QC Division, Korea District Heating Corp.) ;
  • Heesan Kim (Department of Nanomaterials Engineering, Hongik University) ;
  • Jung-Gu Kim (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Soo Yeol Lee (Department of Materials Science and Engineering, Chungnam National University)
  • 송민지 (충남대학교 신소재공학과) ;
  • 김우철 (한국지역난방공사 플랜트기술처 플랜트관리.QC부) ;
  • 김희산 (홍익대학교 나노신소재학과) ;
  • 김정구 (성균관대학교 신소재공학부) ;
  • 이수열 (충남대학교 신소재공학과)
  • Received : 2023.06.02
  • Accepted : 2023.06.20
  • Published : 2023.06.30
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Abstract

The use of biomass is increasing as a response to the convention on climate change. In Korea, a method applied to replace fossil fuels is using wood chips in a cogeneration plant. To remove air pollutants generated by burning wood chips, a selective denitrification facility (Selective catalytic reduction, SCR) is installed downstream. However, problems such as ash deposition and descaling of the equipment surface have been reported. The cause is thought to be unreacted ammonia slip caused by ammonia ions injected into the reducing agent and metal corrosion caused by an acidic environment. Element analysis confirmed that ash contained alkali metals and sulfur that could cause catalyst poisoning, leading to an increase in the size of ash particle and deposition. Measurement of the size of ash deposited inside the facility confirmed that the size of ash deposited on the catalyst was approximately three times larger than the size of generally formed ash. Therefore, it was concluded that a reduction in pore area of the catalyst by ash deposition on the surface of the catalyst could lead to a problem of increasing differential pressure in a denitrification facility.

Keywords

Acknowledgement

본 연구는 한국지역난방공사의 지원을 받아 연구를 수행하였습니다.

References

  1. M.K. Misra, K. Wk. Ragland, A. J. Baker, Wood ash composition as a function of furnace temperature, Biomass and Bioenergy, 4, 103 (1993). Doi: https://doi.org/10.1016/0961-9534(93)90032-Y
  2. Y. Guo, C. Zhao, X. Chen, C. Li, CO2 capture and sorbent regeneration performances of some wood ash materials, Applied Energy, 137, 26 (2015). Doi: http://dx.doi.org/10.1016/j.apenergy.2014.09.086
  3. D. B. Lee, High-temperature corrosion by chlorides in biomass-fired palnts, Journal of the Korean Institute of Surface Engineering, 49, 14 (2016). Doi: http://dx.doi.org/10.5695/JKISE.2016.49.1.14
  4. S. Back, H. Yoo, H. Jang, H. Houng, Y. Seo, Effects of alkali metals and chlorine on corrosion of super heater tube in biomass circulating fluidized bed boiler, Applied Chemistry for Engineering, 28, 29 (2017). Doi: http://doi.org/10.14478/ace.2016.1094
  5. L. Luciana, S. Cimino, Poisoning of SCR Catalysts by Alkali and Alkaline Earth Metals, Catalysts, 10, 1475 (2020). Doi: https://doi.org/10.3390/catal10121475
  6. J. Yeo, S. Hong, The effect of alkali metal ions (Na, K) on NH3-SCR response of V/W/TiO2, Applied Chemical Engineering, 31, 560 (2020). Doi: https://doi.org/10.14478/ace.2020.1069
  7. K. Guo, J. Ji, W. Song, J. Sun, C. Tang, L. Dong, Conquering ammonium bisulfate poison over low-temperature NH3-SCR catalysts: A critical review, Applied Catalysis B: Environmental, 297, 120388 (2021). Doi: https://doi.org/10.1016/j.apcatb.2021.120388
  8. X. Wang, X. Du, S. Liu, G. Yang, Y. Chen, L. Zhang, X. Tu, Understanding the deposition and reaction mechanism of ammonium bisulfate on a vanadia SCR catalyst: A combined DFT and experimental study, Applied Catalysis B: Environmental, 260, 118168 (2020). Doi: https://doi.org/10.1016/j.apcatb.2019.118168
  9. D. Kim, S. Choi, J. Kim, Consideration on the prediction approach of ash deposition propensity in coal-fired boilers, Journal of the Korean Society Combustion, 22, 27 (2017). Doi: http://doi.org/10.15231/jksc.2017.22.4.027
  10. K. Jung, S. Kim, Oxidation and corrosion characteristics of AISI 304 steel under atmospheric and SO2 gas environments at high-temperatures, Journal of the Korean Society of Marine Engineering, 42, 554 (2018). Doi: https://doi.org/10.5916/jkosme.2018.42.7.554
  11. S. Lee, B. Min, N. Jeong, A study on characteristics of HRSG boiler inner tube scale, Corrosion Science and Technology, 11, 82 (2012). https://www.j-cst.org/opensource/pdfjs/web/pdf_viewer.htm?code=C00110300082 10300082
  12. M.C. Fatah, D. Agustiadi, A.W. Pramono, Failure investigation of fire-side water-wall tube boiler, Corrosion Science and Technology, 20, 242 (2021). Doi: https://doi.org/10.14773/cst.2021.20.5.242
  13. L. Luciana, S. Cimino, Poisoning of SCR catalysts by alkali and alkaline earth metals, Catalysts, 10, 1475 (2020). Doi: https://doi.org/10.3390/catal10121475
  14. J. Yeo, S. Hong, The effect of alkali metal ions (Na, K) on NH3-SCR response of V/W/TiO2, Applied Chemical Engineering, 31, 560 (2020). Doi: https://doi.org/10.14478/ace.2020.1069
  15. H. Xao, C. Dou, Y. Ru, C. Qi, L. Cai, The effect of K salts on SO2-SO3 conversion and denitration behavior over V2O5-WO3/TiO2 catalysts, Catalysis Surveys from Asia, 23, 41 (2019). Doi: https://doi.org/10.1007/s10563-019-09265-5
  16. K. Jiao, X. Chen, X. Bie, D. Liu, M. Qiu, S. Ma, Status and development for detection and control of ammonium bisulfate as a by-product of SCR denitrification, Scientific Reports, 11, 10457 (2021). Doi: https://doi.org/10.1038/s41598-021-90040-w
  17. K. Jung, S. Kim, High-temperature corrosion characteristics of T22 and T92 steel in SO2-containing gas at 650 ℃, Corrosion Science and Technology, 18, 285 (2019). Doi: https://doi.org/10.14773/cst.2019.18.6.285