Thermal Spray Coatings for High-Temperature Corrosion Protection in Biomass Co-Fired Boilers.
In: Journal of Thermal Spray Technology, Jg. 24 (2015), Heft 1/2, S. 194-205
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Zugriff:
There are over 1000 biomass boilers and about 500 plants using waste as fuel in Europe, and the numbers are increasing. Many of them encounter serious problems with high-temperature corrosion due to detrimental elements such as chlorides, alkali metals, and heavy metals. By HVOF spraying, it is possible to produce very dense and well-adhered coatings, which can be applied for corrosion protection of heat exchanger surfaces in biomass and waste-to-energy power plant boilers. Four HVOF coatings and one arc sprayed coating were exposed to actual biomass co-fired boiler conditions in superheater area with a probe measurement installation for 5900 h at 550 and 750 °C. The coating materials were Ni-Cr, IN625, Fe-Cr-W-Nb-Mo, and Ni-Cr-Ti. CJS and DJ Hybrid spray guns were used for HVOF spraying to compare the corrosion resistance of Ni-Cr coating structures. Reference materials were ferritic steel T92 and nickel super alloy A263. The circulating fluidized bed boiler burnt a mixture of wood, peat and coal. The coatings showed excellent corrosion resistance at 550 °C compared to the ferritic steel. At higher temperature, NiCr sprayed with CJS had the best corrosion resistance. IN625 was consumed almost completely during the exposure at 750 °C. [ABSTRACT FROM AUTHOR]
Titel: |
Thermal Spray Coatings for High-Temperature Corrosion Protection in Biomass Co-Fired Boilers.
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Autor/in / Beteiligte Person: | Oksa, M. ; Metsäjoki, J. ; Kärki, J. |
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Zeitschrift: | Journal of Thermal Spray Technology, Jg. 24 (2015), Heft 1/2, S. 194-205 |
Veröffentlichung: | 2015 |
Medientyp: | academicJournal |
ISSN: | 1059-9630 (print) |
DOI: | 10.1007/s11666-014-0155-5 |
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