Sulfite oxidation in seawater flue gas desulfurization by plate falling film corona-streamer discharge

摘要

In this paper, sulfite containing effluent from the packed tower of seawater flue gas desulfurization is treated by plate falling film corona-streamer discharge which can solve the scale-up problem of electrical discharge reactors. Effects of pH, electrical discharge intensity, effluent flow rate and temperature on sulfite oxidation are considered. Experimental results indicate that discharge power density is the dominating factor which affects the sulfite oxidation rate by affecting the gaseous radical concentration. Based on experimental results, sulfite oxidation by corona-streamer discharge is proposed as the combination of chain reaction path and radical self-reaction path. In addition, the simplified kinetic equation is expressed in terms of sulfite concentration and discharge power density. Comparing with cylindrical falling film corona-streamer discharge, the plate falling film corona-streamer discharge leads to a fold increase in energy efficiency, besides, scale-up of a plate falling film corona-streamer discharge reactor will affect the energy efficiency insignificantly, all these indicate that the plate falling film discharge has a better potential in large scale utilization than cylindrical falling film discharge.