Authors: K Chandra A Kranzmann R Saliwan Neumann F Rizzo
Publish Date: 2015/07/11
Volume: 84, Issue: 3-4, Pages: 463-490
Abstract
Fireside oxidation of T92 steel was studied after exposure times up to 1000 h in the temperature range of 580–650 °C in simulated dry CO2–27 N2–2 O2–1 SO2 and wet CO2–20 H2O–7 N2–2 O2–1 SO2 oxyfuel environments Water vapour addition to the oxyfuel gas substantially increased the oxidation rate The oxide scales developed under wet environment contained more defects resulting in higher access of oxidants to the substrate material and enhanced oxidation In addition the oxide scales had lower chromium enrichment in the inner layer as compared to that in the dry condition The oxide scales consisted of hematite and magnetite in the outer layer and a mixture of Fe Crspinel sulphides and wustite in the inner layer The sulphur distribution differed between the oxide scales developed in dry and wet oxyfuel environments Sulphur was mainly concentrated in the inner layer and at the oxide/alloy interface In contrast to the wet oxyfuel gas very high sulphur concentration was measured in the inner oxide scale formed in the dry oxyfuel gas Additionally Fesulphide was formed at the interface of inner and outer oxide layer in the wet conditionK Chandra would like to acknowledge Adolf Martens Foundation for his postdoctoral fellowship program under which this research was carried out F Rizzo thanks the support from CAPES CNPq and FAPERJ The authors also wish to thank Mr Goebel Artur for his contribution in conducting the corrosion experiments
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