Effect of flue gas composition on deposit induced high temperature corrosion under laboratory conditions mimicking biomass firing. Part II: Exposures in SO2 containing atmospheres

Sunday Chukwudi Okoro, Saeed Kiamehr, Melanie Montgomery, Flemming Jappe Frandsen, Karen Pantleon

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Abstract

In biomass fired power plants, the fast corrosion of superheaters is facilitatedby the presence of corrosive flue gas species, for example, SO2, which arereleased during combustion. To understand the role of the gas species on thecorrosion process, comparative laboratory exposures of deposit (KCl)-coatedand deposit-free austenitic stainless steel (TP 347H FG) samples to gas mixturescontaining SO2 was carried out, under conditions relevant to biomass-firing.Exposures were conducted isothermally at 560 8C for 72 h, in oxidizingsulphidizing,and oxidizing-sulphidizing-chlorinating gas mixtures containing60 ppmv SO2. Scanning electron microscopy (SEM), energy dispersive X-rayspectroscopy (EDS) and X-ray diffraction (XRD) techniques werecomplimentarily applied to characterize the resulting corrosion products. Apartially molten K2SO4-layer formed on KCl coated specimens, and corrosionresulted in localized broad pits containing sulphides and oxides. The severepitting attack was decreased by the presence of HCl in the gas mixture.
Original languageEnglish
JournalMaterials and Corrosion
Volume68
Issue number5
Pages (from-to)515-528
ISSN0947-5117
DOIs
Publication statusPublished - 2017

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