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11187 Effect of Oxy-firing on Fireside Corrosion

Picture for 11187 Effect of Oxy-firing on Fireside Corrosion
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Product Number: 51300-11187-SG
ISBN: 11187 2011 CP
Author: Michael A. Bestor and Bruce A. Pint
Publication Date: 2011
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Using oxygen, rather than air, in coal-fired boilers has been studied for several years as a strategy to reduce NOx and concentrate CO2 for capture. In combination with flue gas recirculation, higher levels of CO2, H2O and SO2 may be expected. In order to understand the role of substrate composition on corrosion, commercial and model alloys are being investigated both with and without the presence of synthetic coal ash. The initial work focused on the effect of CO2 concentration on several ferritic steels at 600°C, but rates were compared with austenitic steels and Ni-base alloys. As expected, the corrosion rate in the presence of ash and SO2 in the gas was very high and decreased with increasing alloy Cr content. When the CO2 content was increased by 10%, the metal loss increased but did not further increase with 20%CO2. Without ash, the presence of CO2 accelerated the attack compared to steam oxidation rates at 600°C. Surprisingly, the mass changes were similar in CO2-50%H20 without ash and in the experiment with SO2 and ash. However, these initial ash experiments did not contain H2O.

Key words: oxy-firing, air firing, fireside corrosion, carbon sequestration
Using oxygen, rather than air, in coal-fired boilers has been studied for several years as a strategy to reduce NOx and concentrate CO2 for capture. In combination with flue gas recirculation, higher levels of CO2, H2O and SO2 may be expected. In order to understand the role of substrate composition on corrosion, commercial and model alloys are being investigated both with and without the presence of synthetic coal ash. The initial work focused on the effect of CO2 concentration on several ferritic steels at 600°C, but rates were compared with austenitic steels and Ni-base alloys. As expected, the corrosion rate in the presence of ash and SO2 in the gas was very high and decreased with increasing alloy Cr content. When the CO2 content was increased by 10%, the metal loss increased but did not further increase with 20%CO2. Without ash, the presence of CO2 accelerated the attack compared to steam oxidation rates at 600°C. Surprisingly, the mass changes were similar in CO2-50%H20 without ash and in the experiment with SO2 and ash. However, these initial ash experiments did not contain H2O.

Key words: oxy-firing, air firing, fireside corrosion, carbon sequestration
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