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Emissions of Sulfur Trioxide from Coal-Fired Power Plants
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Journal Article
Emissions of Sulfur Trioxide from Coal-Fired Power Plants
2004
Overview
Emissions of sulfur trioxide (SO
3
) are a key component of plume opacity and acid deposition. Consequently, these emissions need to be low enough to not cause opacity violations and acid deposition. Generally, a small fraction of sulfur (S) in coal is converted to SO
3
in coal-fired combustion devices such as electric utility boilers. The emissions of SO
3
from such a boiler depend on coal S content, combustion conditions, flue gas characteristics, and air pollution devices being used. It is well known that the catalyst used in the selective catalytic reduction (SCR) technology for nitrogen oxides control oxidizes a small fraction of sulfur dioxide in the flue gas to SO
3
. The extent of this oxidation depends on the catalyst formulation and SCR operating conditions. Gas-phase SO
3
and sulfuric acid, on being quenched in plant equipment (e.g., air preheater and wet scrubber), result in fine acidic mist, which can cause increased plume opacity and undesirable emissions. Recently, such effects have been observed at plants firing high-S coal and equipped with SCR systems and wet scrubbers. This paper investigates the factors that affect acidic mist production in coal-fired electric utility boilers and discusses approaches for mitigating emission of this mist.
Publisher
Taylor & Francis Group,Air & Waste Management Association,Air and Waste Management Association,Taylor & Francis Ltd
