Measurement and modeling of sulfur trioxide formation in a flow reactor under oost-flame conditions

摘要

The present work focuses on the impacts of different combustion parameters on the formation of sulfur trioxide (SO_3). The outlet SO_3 concentrations from a quartz reactor operated within the temperature range of 800 K to 1673 K were measured using the controlled condensation method. Post-flame conditions were examined with and without combustibles, and the effects of SO_2, O_2, NO, H_2O, and CO_2 on SO_3 formation were investigated. The formation of SO_3 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 SO_3 concentration increased as the experimental temperature and O_2 concentration increased. When reactive gases (e.g., NO, CO, and CH_4) were introduced, the formation of SO_3 was increased, mainly as the result of increased concentrations of radicals. In addition, the combustion atmosphere (comprising N_2, CO_2, and H_2O) influenced the amount of SO_3 formed. A higher concentration of H_2O clearly increased SO_3 formation in the absence of combustibles.