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10079 Environmental Degradation of Thermowells in a Coastal Fluidized Bed Biomass Power Boiler

Picture for 10079 Environmental Degradation of Thermowells in a Coastal Fluidized Bed Biomass Power Boiler
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Product Number: 51300-10079-SG
ISBN: 10079 2010 CP
Author: Joseph R. Kish, Douglas L. Singbeil and Ray Seguin
Publication Date: 2010
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$20.00
$20.00
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 a molten chloride-containing salt. The relative corrosion resistance ranking order of Alloy 600 > Alloy 625 > Type 310H stainless steel > Type 446 stainless steel is consistent with the reported influence of nickel and chromium alloying on corrosion resistance in molten chloridecontaining salts.

Keywords: power boilers, biomass, fluidized bed, thermowells, corrosion, molten salt, chloride, sulphate, alloy
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 a molten chloride-containing salt. The relative corrosion resistance ranking order of Alloy 600 > Alloy 625 > Type 310H stainless steel > Type 446 stainless steel is consistent with the reported influence of nickel and chromium alloying on corrosion resistance in molten chloridecontaining salts.

Keywords: power boilers, biomass, fluidized bed, thermowells, corrosion, molten salt, chloride, sulphate, alloy
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