Corrosion of Thermowells in a Coastal Fluidized Bed Biomass Power Boiler

Abstract A metallographic examination was conducted on a set of degraded alloy thermowells, which were installed in the fluidized bed of a coastal fluidized bed biomass (waste-wood) power boiler. Because of the importance of temperature measurement in the boiler control strategy, the plant wanted to understand the corrosion mechanism and choose longer-lived materials. The analytical results suggest that the corrosion was caused by contact with …