Measurement and modeling of sulfur trioxide formation in a flow reactor under post-flame conditions
2013
Fleig, Daniel | Alzueta, María. U. | Normann, Fredrik | Abián, María | Andersson, Klas | Johnsson, Filip
The present work focuses on the impacts of different combustion parameters on the formation of sulfur trioxide (SO₃). The outlet SO₃ concentrations from a quartz reactor operated within the temperature range of 800K to 1673K were measured using the controlled condensation method. Post-flame conditions were examined with and without combustibles, and the effects of SO₂, O₂, NO, H₂O, and CO₂ on SO₃ formation were investigated. The formation of SO₃ along the quartz reactor was modeled with a detailed chemical reaction mechanism by assuming plug-flow and using measured temperature profiles. Only reactions that occurred in the gas phase were considered. In the absence of combustibles, the outlet SO₃ concentration increased as the experimental temperature and O₂ concentration increased. When reactive gases (e.g., NO, CO, and CH₄) were introduced, the formation of SO₃ was increased, mainly as the result of increased concentrations of radicals. In addition, the combustion atmosphere (comprising N₂, CO₂, and H₂O) influenced the amount of SO₃ formed. A higher concentration of H₂O clearly increased SO₃ formation in the absence of combustibles.
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