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Corrosion of superheaters at 600C steam in biomass-fired boilers
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science. (Leygraf)
Sandvik Materials Technology, Sandviken.
2011 (English)In: EuroCorr 2011: developing solutions for the global challenge, 2011, 4656- p.Conference paper, Published paper (Other academic)
Abstract [en]

A steam loop for corrosion testing was constructed in stainless steel and attached to one of the superheaters in a power station boiler which ran on a mixture of biomass and waste. The loop raised the final steam temperature to about600°Cat 140 bar and was in service for 5500 h. A number of different test materials were welded into the loop for evaluation. Their wall thicknesses were measured before and after exposure and a number of sections were examined metallographically after exposure to investigate steam-side oxidation and fire-side corrosion.

 

The alloys with the highest Ni and Cr contents (over 30 and 20 wt% respectively) showed negligible steam-side oxidation. Regarding fireside corrosion a stainless steel containing 18%Cr and 11%Ni exhibited the second lowest corrosion rates, performing much better than all of the higher alloyed steels.  The corrosion rate for this steel was not temperature sensitive and appeared to decrease as the temperature increased.  Large amounts of internal or selective corrosion were seen in all the materials tested at 600°C steam.

Place, publisher, year, edition, pages
2011. 4656- p.
Keyword [en]
high temperature corrosion, biomass
National Category
Metallurgy and Metallic Materials
Research subject
SRA - Energy
Identifiers
URN: urn:nbn:se:kth:diva-50401OAI: oai:DiVA.org:kth-50401DiVA: diva2:461785
Conference
EuroCorr 2011: developing solutions for the global challenge. Stockholm, Sweden. 4 - 8 September 2011
Funder
StandUp
Note
QC 20111207Available from: 2011-12-05 Created: 2011-12-05 Last updated: 2011-12-07Bibliographically approved

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