M. Mayoral, J. Andrés, S. Laguarta
Nov 1, 2016
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Influential Citations
7
Citations
Journal
Fuel
Abstract
Abstract This work explores potassium pyrosulphate (K 2 S 2 O 7 ) reactivity with iron, chromium and nickel oxides as simulation of the corrosion risk caused by alkaline deposits in the oxy-fuel co-firing of coal with high KCl biomass. TGA studies confirm the formation of metallic trisulphates (K 3 Fe(SO 4 ) 3 , K 3 Cr(SO 4 ) 3 and K 2 Ni 2 (SO 4 ) 3 ) at 500 °C and 560 °C. Selected steels and alloys (P91, 409, 304, 347, 310, I800HT and I617) were pre-oxidised in 5% O 2 /CO 2 for 200 h and the oxidation scales were treated with K 2 S 2 O 7 to study the mechanism of oxide dissolution by Fe, Cr and Ni trisulphates, and inner sulphidation.