Canadian Journal of Chemical Engineering, Vol.98, No.9, 1989-1997, 2020
Absorption of sulphur dioxide by electrosprayed droplets
This paper describes and discusses experimental results on the absorption of sulphur dioxide in electrified water sprays, either when the polluted gas is treated as is or when the gas is exposed to a corona source to ionize the sulphur dioxide. The experiments revealed that an electrified spray with a charge-to-mass ratio of 50 mu C center dot kg(-1)enabled the absorption rate of droplets to double, regardless of their polarities. Corona charging gave rise to an increase in the SO(2)depletion rate over the scrubber wall, while negligible effects appeared on the actual droplets absorption rate. These findings suggested that faster absorption rates mostly, though not uniquely, depend on the modifications on the morphological and interfacial properties of the sprayed droplets induced by the free electric charge imposed on their surface. Conversely, the absorption rates were negligibly affected by the electrical interactions between droplets (either charged or uncharged) and the sulphur dioxide ions/radicals originating from the corona source.