Removal of SO2 and NO in flue gas using a vacuum ultraviolet light/Oxone/H2O2 oxidation system

IF 6.7 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2025-02-12 DOI:10.1016/j.fuel.2025.134537

Yan Wang , Dexin Kong , Xinyu Gao , Jianfeng Pan , Yangxian Liu

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引用次数: 0

Abstract

In this article, a vacuum ultraviolet light (VUV)/Oxone/H₂O₂ oxidation system was developed to realize the oxidation removal of NO and SO₂ in simulated flue gas stream. Results show that the developed VUV/Oxone/H₂O₂ oxidation system shows much stronger NO removal ability than VUV/Oxone oxidation system. The synergistic effect between dual oxidants leads to a significant rise in the yield of free radicals, thus strengthening the removal of NO. The VUV/Oxone/H₂O₂ oxidation system realizes a high denitration and desulfurization efficiency (95.5 % for NO and 100 % for SO₂). 185 nm wavelength realizes the best NO removal effect in this system. The increase of light intensity, H₂O₂ concentration and Oxone concentration can significantly promote NO removal. Increasing temperature leads to an initial increase and then a decrease in NO removal efficiency. Higher Oxone/H₂O₂ solution pH value has an adverse impact on NO removal. Five removal pathways, such as oxidation by hydroxyl radical, oxidation by sulfate radical, oxidation by oxygen atom/ozone, direct photolysis by VUV, and oxidation by peroxides, are responsible for NO removal. Among them, oxidation by hydroxyl radical plays a critical role, and oxidation by sulfate radical/oxygen atom/ozone plays a second critical role in NO removal. Absorption kinetics study shows that the oxidation removal process of NO in the VUV/Oxone/H₂O₂ oxidation system is within a fast kinetic region.

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.