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Co-absorption and Reduction Mechanism of SO2 and NO2 from Flue Gas Using a Na2SO3 Solution with an Oxidation Inhibitor.
- Source :
-
Environmental Engineering Science . Apr2021, Vol. 38 Issue 4, p277-284. 8p. - Publication Year :
- 2021
-
Abstract
- Herein, a novel Na2SO3 process enhanced with an oxidation inhibitor was proposed for the synergic removal of SO2 and NO2 from nonferrous smelting flue gas. The co-absorption and reduction characteristics and mechanism of SO2 and NO2 were investigated. Results showed that when 80.59, 161.17, and 241.76 mM Na2S2O3 was added into 2% of Na2SO3 solution, NO2 absorption capacity increased to 264%, 300%, and 330%, and that of SO2 increased to 162%, 198%, and 232%, respectively. The inhibition action of Na2S2O3 was achieved by reacting S 2 O 3 2 − with ∙ S O 3 − to form an inert substance polythionate that prevents ∙ S O 3 − from reacting with dissolved oxygen. The co-absorption and reduction characteristics of SO2 and NO2 revealed that ∼42.5% of NO2(N) was reduced to N2, 21.5% of NO2(N) combined with S O 3 2 − to form O N S O 3 − compounds, 5% of NO2(N) formed N O 3 − in solution, and 22.6% of NO2(N) was reduced to NO into flue gas. Therefore, the enhanced Na2SO3 process shows potential for synergistic desulfurization and NO2 removal from the nonferrous metal smelting industry. [ABSTRACT FROM AUTHOR]
- Subjects :
- *FLUE gases
*NONFERROUS metals
*NONFERROUS metal industries
*OXIDATION
Subjects
Details
- Language :
- English
- ISSN :
- 10928758
- Volume :
- 38
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Environmental Engineering Science
- Publication Type :
- Academic Journal
- Accession number :
- 149939448
- Full Text :
- https://doi.org/10.1089/ees.2020.0324