Dewpoint Corrosion of a Coastal Biomass Power Boiler Air Heater, 2008 Engineering, Pulping and Environmental Conference

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Significant corrosion of cold-end air heater tubes has occurred in a biomass (waste-wood) power boiler operated on the Canadian west coast. A field testing program was initiated to better understand the suspected dewpoint corrosion conditions, and to identify a more corrosion resistant alloy from which to construct replacement tube sections or sleeve tube inserts. This effort involved reviewing the non routine inspection results to document the damage history and extent, and the use of a custom-built, air-cooled corrosion/deposit probe to characterize the controlling environmental and material factors. This paper documents the results of this effort.