Journal article
Effect of flue gas composition on deposit induced high temperature corrosion under laboratory conditions mimicking biomass firing. Part II: Exposures in SO2 containing atmospheres : Exposures in SO2 containing atmospheres
Department of Mechanical Engineering, Technical University of Denmark1
Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark2
Department of Chemical and Biochemical Engineering, Technical University of Denmark3
CHEC Research Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark4
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.
| Language: | English |
|---|---|
| Year: | 2017 |
| Pages: | 515-528 |
| ISSN: | 15214176 and 09475117 |
| Types: | Journal article |
| DOI: | 10.1002/maco.201609174 |
| ORCIDs: | Okoro, Sunday Chukwudi , Montgomery, Melanie , Jappe Frandsen, Flemming and Pantleon, Karen |
