Various harms on equipment and atmospheric environment

including low-temperature corrosion

fouling and blue plumes

can be caused by SO3 in flue gas for a coal-fired boiler. To predict and control SO3 concentration to meet the increasing demands for energy conservation and emission reduction

more accurate knowledge on the effect of the factors that influence SO3 in flue gas is required. Thus

in present work

a kinetic model was built by optimizing the previously developed kinetic models. The effect of the factors that influence SO3 in flue gas was studied by numerically calculating SO3 concentration under different conditions. Moreover

SO3 concentrations under the conditions mentioned above were measured using a perfectly stirred reactor measuring apparatus built in this work. It was found that SO3 concentration was apparently affected by the factors

namely

the concentrations of SO2

O2 and H2O

as well as temperature and residence time. SO3 concentration was seemingly affected by the concentrations of CO and NO

while was less influenced by CO2 concentration. In addition

SO3 concentration underwent three stages of sharp increase

slow increase and gradual decrease with increasing residence time.