Aqueous ammonia has potential to capture the large amounts of SO2 and CO2 in coal-fired flue gas.The study in this area

however

is very limited.The reaction of SO2 with aqueous ammonia is much faster than that of CO2

so SO2 in the flue gas may have impact on capture of CO2.A series of experimental tests were conducted in a wetted wall column system

and the impact of SO2 concentration and SO2 loading on CO2 flux and coefficient of mass transfer using aqueous ammonia［1%—7%（mass)］was analyzed at various absorption temperatures(20—80℃)and CO2 concentrations［5%—20%（vol)］.The results show that when SO2 concentration increases from 0 to 11428 mg·m-3

CO2 mass transfer flux and coefficient decrease to one half of the original values.When SO2 loading［0.1—0.4 mol SO2·（mol NH3)-1］increases

CO2 mass transfer flux and coefficient also have significant reduction.Higher ammonia concentration and absorption temperature can effectively improve CO2 mass transfer flux and coefficient

and relatively reduce the impact of SO2 on CO2 mass transfer.CO2 mass transfer flux increases when its concentration increases

and its mass transfer coefficient decreases.