Effects of experimental parameters on simultaneous removal of SO2 and NO by VUV/H2O2 advanced oxidation process in a pilot‐scale photochemical spraying tower

Background Emissions of SO2 and NO from flue gas have caused serious environmental pollution issues. UV/vacuum ultraviolet(VUV)‐activated H2O2 advanced oxidation technology is one of the most promising processes to realize the simultaneous removal of SO2 and NO. From the application perspective, it...

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Bibliographic Details
Published in:Journal of chemical technology and biotechnology (1986) 2019-03, Vol.94 (3), p.721-729
Main Authors: Xie, Wenxia, Xu, Chengwei, Zhang, Jun, Liu, Yangxian, Xi, Jianfei, Gu, Zhongzhu, Lv, Jianhong
Format: Article
Language:English
Subjects:
active species
Ammonia
coal‐fired flue gas
Flue gas
Gas flow
Growth rate
Hydrogen peroxide
Industrial applications
Irradiation
Operating costs
Organic chemistry
Oxidation
Oxidation process
Photochemicals
pilot‐scale photochemical spraying tower
simultaneous removal
Spraying
Sulfur dioxide
Technology
Vacuum
VUV irradiation
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Summary:Background Emissions of SO2 and NO from flue gas have caused serious environmental pollution issues. UV/vacuum ultraviolet(VUV)‐activated H2O2 advanced oxidation technology is one of the most promising processes to realize the simultaneous removal of SO2 and NO. From the application perspective, it is necessary to carry out further research in a pilot‐scale photochemical reactor with industrial conditions and actual coal‐fired flue gas running conditions. Results Results showed that SO2 removal efficiency can reach 100% under most experimental conditions. An increase of the VUV irradiation intensity, H2O2 concentration and solution pH can promote NO removal, but the growth rate of that gradually slows down. It is not conducive to NO removal when the flue gas flow and NO concentration increases. Increasing liquid–gas ratio has dual effects on NO removal; NO removal efficiency increases at first, and then decreases sharply. SO2 concentration has no great impact on removal of NO. Results of ion chromatography (IC) demonstrate that SO42− and NO3− are the major removal products of SO2 and NO. Conclusion The VUV‐activated H2O2 advanced oxidation technology is suitable for industrial application. The investment and operating costs of this technology are lower than those of the combined processes NH3‐SCR and Ca‐WFGD. © 2018 Society of Chemical Industry
ISSN:0268-2575
1097-4660
DOI:10.1002/jctb.5816