oa South African Journal of Chemical Engineering - A novel method for NOx and Hg emission control in power plants using existing wet limestone scrubbers
Research was performed in a simulated wet flue gas desulphurization scrubber to enhance NOx (NO and NO2) and Hg (Hg2+ and Hg0) removals. Research showed that is a possibility to achieve a multi-pollutant (SO2, NOx and Hg) removal capacity in a wet flue gas desulphurization scrubber fed by limestone and sodium chlorite solution. Sodium chlorite additive was effective in increasing of NOx and Hg capture. In this paper, investigation is focused mainly on NO2 capture in the scrubber, which is the most demanding pollutant in respect to control. It was showed, that changing conditions in the wet scrubber could change the process effectiveness. Research showed also how NOx (as NO2) absorption could be improved in a multi-pollutant scrubber without changing other pollutants (SO2, Hg) removals capacity.
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