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Alloy degradation in a co-firing biomass CFB vortex finder application at 880 °C
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
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 °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 Na 2 SO 4 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]
Alloy 310S, Alloy 600, Alloy 800H/HT, Carbide, CFB boiler, Chloride, Cl, CO, Co-combustion, CO 2, HCl, High-temperature corrosion, K, N 2, Na, NH 3, Nitride, O 2, Oxide, SO 2, Sulfide, Volatilization, Vortex finder
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-246452DOI: 10.1016/j.corsci.2019.01.038ISI: 000462108000014Scopus ID: 2-s2.0-85061199948OAI: oai:DiVA.org:kth-246452DiVA, id: diva2:1297187
Note

QC 20190319

Available from: 2019-03-19 Created: 2019-03-19 Last updated: 2019-04-09Bibliographically approved

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