Journal
CHEMICAL ENGINEERING RESEARCH & DESIGN
Volume 130, Issue -, Pages 321-333Publisher
ELSEVIER
DOI: 10.1016/j.cherd.2017.12.043
Keywords
Absorption-oxidation; Nitric oxide (NO); Sulfur dioxide (SO2); Free radicals; Aqueous persulfate activated by; UV-light and heat; UV-impinging stream reactor
Categories
Funding
- National Natural Science Foundation of China [U1710108, 51576094]
- Jiangsu Six Personnel Peak Talent-Funded Projects [GDZB-014]
- China Postdoctoral Science Foundation [2017M531281]
- Training Project of Jiangsu University Youth Backbone Teacher
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Simultaneous absorption-oxidation process of nitric oxide (NO) and sulfur dioxide (SO2) from flue gas using aqueous ammonium persulfate synergistically activated by UV-light and heat in a novel UV-impinging stream reactor was developed. The main influencing factors, products and active species of NO and SO2 simultaneous removal were studied. The mass transfer and kinetics of NO absorption-oxidation were also investigated. The present studies show that SO2 is very easy to remove because of its very high solubility in water (SO2 removal efficiencies reach 100% under most of experimental conditions). Increasing S2O82- concentration, UV radiation power, activation temperature or liquid-gas ratio promotes absorption-oxidation of NO. Increasing solution pH, concentrations of NO and SO2 or flue gas flow inhibits absorption-oxidation of NO. The contents of O-2 and CO2 have no significant effect on removal of NO. The highest simultaneous removal efficiency for NO and SO2 is 96.1% and 100%, respectively. (OH)-O-center dot and SO4-center dot are the key oxidizers for NO removal. Absorption-oxidation process of NO meets a fast pseudo-first order reaction for NO, and can be enhanced by increasing the gas-side mass transfer coefficient and interfacial area. (C) 2017 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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