Understanding Corrosion Mechanisms in Oxy-Fired Systems
نویسندگان
چکیده
Replacing air with oxygen in coal-fired boilers (i.e. oxy-firing) combined with flue gas recirculation is a leading strategy to concentrate CO2 and assist in carbon capture and sequestration. A significant area of concern is the fireside corrosion with oxy-firing due to the higher CO2 levels in the combustion gas and potentially higher SOx and H2O levels. In order to investigate this complicated issue, laboratory experiments are being conducted with and without synthetic ash to assess the potential effect of oxy-firing on fireside corrosion rates. The initial results of this project focus on commercial and model Fe-base alloys at 600°C. Without ash, a 50%H2O-50%(CO2-0.15O2) environment was the most aggressive condition, requiring higher Cr contents than 100% H2O or Ar-50%CO2. With the specimens covered in ash, several gas compositions were examined, including different levels of H2O and SO2 to simulate various oxy-firing strategies. Results also are presented for several laser-clad coating compositions for protecting tubes. An additional task is examining the effect of environment on mechanical properties. Initial work studied Ni-base alloys in steam at 800°C and found little effect of steam on the creep rupture life of alloy 230 but a 35% decrease for alloy 740.
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Characterization and Prediction of Oxy-combustion Impacts in Existing Coal-fired Boilers
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