Journal
OXIDATION OF METALS
Volume 80, Issue 5-6, Pages 529-540Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11085-013-9394-y
Keywords
Fireside corrosion; Superheater corrosion; Coal/biomass co-firing; Air- firing
Categories
Funding
- Energy Programme
- specifically the Supergen initiative [GR/S86334/01, EP/F029748]
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A series of laboratory-based fireside corrosion exposures were conducted to assess the effect of such conditions on superheater/reheater materials at higher than conventional metal temperatures. Controlled atmosphere furnaces combined with the deposit recoat test method were used to generate the exposure conditions; the gaseous environment simulated that anticipated from air-firing 20 wt% cereal co-product mixed with a UK coal. The exposures were carried out at 600, 650 and 700 A degrees C with four candidate materials: T92, HR3C and 347HFG steels; nickel-based alloy 625. After the exposures, the samples were examined by SEM/EDX to characterize the damage. Pre- and post-exposure dimensional metrology were used to quantify the metal damage in terms of metal loss distributions. For the austenitic steels, the combined deposit/gas/temperature exposure conditions enabled quantification of the characteristic 'bell-shaped' curves (of damage as a function of temperature) for fireside corrosion.
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