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Quick Vaporization of Sprayed NaClO (aq) for Simultaneous Removal of NO x , SO 2 , and Hg 0 .

Sodium hypochlorite (NaClO) has been widely used as a chemical additive for enhancing NOx (NO + NO2 ), SO2 , and Hg0 removals in a wet scrubber. However, they are each uniquely dependent on NaClO(aq) pH, hence making the simultaneous control difficult. In order to overcome this weakness, we sprayed low L/G ratio (0.1 L/Nm3 ) of NaClO(aq) to vaporize quickly at 165 o C. Results have shown that the maximized removals of NOx , SO2 , and Hg0 can be optimized at the pH range between 4.0 and 6.0. When NOx and Hg0 are coexisted with SO2 , in addition, their removals are significantly enhanced by reactions with solid and gaseous by-products such as NaClO(s) , NaClO2(s) , OClO, ClO, and Cl species, originated from the reaction between SO2 and NaClO(aq) . We have also demonstrated the feasibility of this approach in the real flue gases of a combustion plant and observed 50%, 80%, and 60% of NOx , SO2 , and Hg0 removals, respectively. These lead us to conclude that the spray of NaClO(aq) at relatively high temperature of which the sprayed solution can vaporize quickly, makes the simultaneous control of NOx , SO2 , and Hg0 possible. Implications Statement The simply spray of NaClO(aq) at temperature above 165 o C can make the simultaneous removal of gaseous NOx , SO2 , and Hg0 by its quick vaporization. Their maximized removals are adjusted at the pH range between 4.0 and 6.0. NOx and Hg0 removals are also enhanced by gaseous and solid intermediate products generated from the reaction of SO2 with NaClO(aq) . The feasibility of this approach has been demonstrated in the real flue gases of a combustion plant.

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