Abstract
• Simultaneous de-SO x /de-NO x scrubbing enhanced by NaClO 2 solutions. • Advanced De-NO x performance in simultaneous absorption. • Synergistic role of SO 2 on the oxidation/absorption of NO x. • Faster de-NO x oxidative mechanisms under acidic NaClO 2 solutions. • Simultaneous absorption model based on operating dosage. In this work, we investigate the use of a Wet-Oxidative Scrubber (WOS) to simultaneously control SO 2 and NO x emissions from exhaust flue-gases. The experiments are performed in a pilot-scale scrubber with a simulated flue-gas containing 500 ppm v of SO 2 and 1030 ppm v of NO x , using water doped with 0.25–1% w/w of NaClO 2 . The results prove that the adopted WOS is able to simultaneously remove SO 2 and NO x , and a synergistic effect is observed for the presence of SO 2 in the flue-gas, which improves the NO x removal by establishing more effective and faster oxidative mechanisms under acidic conditions. A predictive model of the WOS unit performance based on the experimental dosage of NaClO 2 , which takes into account for all the operating parameters of the process, is developed to predict the de-SO x and de-NO x efficiencies and also the wash water pH.
Published Version
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