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Alloy degradation in a co-firing biomass CFB vortex finder application at 880 degrees C
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2019 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 150, p. 136-150Article in journal (Refereed) Published
Abstract [en]

Mechanisms of alloy degradation in a fireside N-S-O-C-H-Cl-Na-K atmosphere at 880 degrees C were elucidated using SEM-EDS, chemical equilibrium calculations, and XRD. Alloys 310S, 800H/HT, and 600 were studied after 0, 8000, and 16,000 h exposure in a boiler co-firing biomass waste. For 310S and 800H/HT it was shown that nitrogen formed internal Cr nitrides lowering the Cr activity and inhibiting internal alloy Cr permeation, and that NaCl and Na2SO4 reacted with Cr oxide to form chromate and to accelerate the S and the Cl pickup. Alloy 600 showed no nitride or major chromate formation.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 150, p. 136-150
Keywords [en]
Na, K, Cl, O-2, CO, CO2, HCl, SO2, NH3, N-2, Nitride, Carbide, Sulfide, Oxide, Chloride, Volatilization, Vortex finder, CFB boiler, High-temperature corrosion, Alloy 310S, Alloy 800H/HT, Alloy 600, Co-combustion
National Category
Corrosion Engineering
Identifiers
URN: urn:nbn:se:umu:diva-157937DOI: 10.1016/j.corsci.2019.01.038ISI: 000462108000014OAI: oai:DiVA.org:umu-157937DiVA, id: diva2:1305784
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Bio4EnergyAvailable from: 2019-04-18 Created: 2019-04-18 Last updated: 2019-08-30Bibliographically approved

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Hagman, HenrikBackman, Rainer

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