Removal of NO in Mist by the Combination of Plasma Oxidation and Chemical Absorption

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• 作者：Deyuan Xie ; Ye Sun ; Tianle Zhu ; Li Ding
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：June 16, 2016
• 年：2016
• 卷：30
• 期：6
• 页码：5071-5076
• 全文大小：453K
• 年卷期：0
• ISSN：1520-5029

文摘

A coaxial nonthermal plasma (NTP) reactor was used for oxidizing and removing NO in mist. The effects of gas/mist components on O₃ formation, NO oxidation, and NO_x removal by NTP in simulated flue gas after wet desulfurization were investigated. The presence of mist results in the significant decrease of O₃ concentration. Formation of active species, such as OH and HO₂, would promote the reactions between NO and OH/HO₂. Thus, the NO oxidation, NO_x removal, and energy efficiency are significantly improved in the presence of mist. The promotion effects of mist component on the NO oxidation and NO_x removal follow the order: Na₂SO₃ mist > FeSO₄ mist > Na₂SO₄ mist. Increase of the mist pH can enhance the absorption of nitrogen oxides with the mist. Adding SO₂ to the gas mixtures or raising the NO₂/NO_x ratio of simulated gas increases the NO_x removal efficiency. This process demonstrates that NO oxidation by NTP and subsequently absorption by mist are feasible and have great value to practical application.