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The effect of a sulphur-containing additive on the initial corrosion of superheater tubes in a waste-fired boiler
RISE, Swerea, Swerea KIMAB.
RISE, Swerea, Swerea KIMAB.
2008 (English)In: EUROCORR 2008 - European Corrosion Congress: Managing Corrosion for Sustainability, Book of Abstracts, 2008, 164- p.Conference paper, Published paper (Refereed)
Abstract [en]

The major drawback to generating electricity from waste-fired boilers is the rapid corrosion of superheaters which increases the maintenance costs. Within the last few years it has been shown that additions of ammonium sulphate to biomass-fired boilers decrease the corrosion tendencies. This paper reports on the effects of ammonium sulphate on corrosion in a waste-fired CFB boiler. Internally cooled probes were exposed at a position corresponding to the one of superheater tubes. The probe temperature was 500°C, simulating a steam temperature of about 450°C. Both the austenitic steel EN 1.4301 (Fe-18Cr-9Ni) and the low-alloyed ferritic steel EN 1.7380 (Fe-2.25Cr-1Mo) were tested. During exposure the concentration of alkali chlorides in the flue gas was measured and a decrease was observed when adding ammonium sulphate. After 4 hours of exposure, the probes were removed for detailed analysis with SEM-EDX, TOF-SIMS and XRD. The sides of the tubes facing the flue gas were covered with a calcium-rich deposit, while sodium and potassium were the main components on the lee side. The results also show that ammonium sulphate shifted the deposit composition from chioride-rich and highly corrosive, to one significantly less corrosive and dominated by sulphates of Na, K and Ca. Metallography shows a marked difference in corrosion attack between the two steels. Iron chlorides accumulate at the metal/oxide interface of the ferritic steel, while the amounts of iron chlorides were significantly lower in the austenitic steel. These results indicate that ammonium sulphate has the potential to reduce corrosion in waste-fired boilers and that austenitic stainless steels are more likely to resist corrosion in these environments than low alloy ferritic steels.

Place, publisher, year, edition, pages
2008. 164- p.
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12988OAI: oai:DiVA.org:ri-12988DiVA: diva2:973181
Conference
European Corrosion Congress: Managing Corrosion for Sustainability, EUROCORR 2008, Edinburgh, 7 September 2008 through 11 September 2008
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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Swerea KIMAB
Materials Engineering

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