Staged combustion produces reducing/sulfidizing conditions that are particularly corrosive to the lower furnace walls. On the other hand, the conditions at superheaters/reheaters are typically oxidizing. However, due to relatively high metal temperatures, the superheater/reheater tubes tend to suffer from severe coal ash corrosion attack due to alkali metals contained in the ash. The problem will be further intensified when the steam outlet temperatures of advanced combustion systems are to increase significantly. To address these corrosion concerns, Babcock & Wilcox (B&W) intends to develop corrosion models in this program that are capable of predicting lower furnace and superheater/reheater corrosion wastage. Because corrosion attack is thermally activated, the effect of temperature will also be investigated. Ohio State University (OSU) faculty will support B&W's efforts by contributing their technical expertise in the area of high temperature corrosion.
This project will develop computational models to predict corrosion associated with staged combustion techniques used to reduce NOx emissions. This project will aid in the design and maintenance of boilers, especially those operating at elevated temperatures, and will contribute to attainment of DOE targets for increased efficiency and reduced emissions in power plants.
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