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51312-01494-Materials Performance with Na2CO3-V2O5-CaSO4 Deposit under Moist Synthetic Air

Picture for Materials Performance with Na2CO3-V2O5-CaSO4 Deposit under Moist Synthetic Air
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Product Number: 51312-01494-SG
ISBN: 01494 2012 CP
Author: Satu Tuurna
Publication Date: 2012
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Heavy fuel oils used in diesel engines contain residues of e.g. vanadium sodium calcium sulphur nickel and aluminium. Their amount varies depending on the source of the crude oil refining methods as well as mixing ratio and handling process. During combustion these residues become concentrated in the ash. The sodium and vanadium levels are of major concern since they cause high temperature corrosion at temperatures over 500°C. During combustion these elements oxidize and contribute to formation of semi-liquid and low melting salts causing increased fouling and corrosion of components. Higher efficiency and therefore higher operation temperature and also lower quality fuels for economic reasons are future targets and these create additional material challenges already demanding conditions. The corrosion resistance of various currently used and new alternative materials under simulated medium speed diesel engine exhaust system environments were experimentally clarified. The selected materials were exposed at 650 and 750°C under moist synthetic air with Na2CO3-V2O5-CaSO4 deposit up to 1000 h. The specimens were analysed in terms of cross-section microscopy.
Heavy fuel oils used in diesel engines contain residues of e.g. vanadium sodium calcium sulphur nickel and aluminium. Their amount varies depending on the source of the crude oil refining methods as well as mixing ratio and handling process. During combustion these residues become concentrated in the ash. The sodium and vanadium levels are of major concern since they cause high temperature corrosion at temperatures over 500°C. During combustion these elements oxidize and contribute to formation of semi-liquid and low melting salts causing increased fouling and corrosion of components. Higher efficiency and therefore higher operation temperature and also lower quality fuels for economic reasons are future targets and these create additional material challenges already demanding conditions. The corrosion resistance of various currently used and new alternative materials under simulated medium speed diesel engine exhaust system environments were experimentally clarified. The selected materials were exposed at 650 and 750°C under moist synthetic air with Na2CO3-V2O5-CaSO4 deposit up to 1000 h. The specimens were analysed in terms of cross-section microscopy.
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