Simultaneous Removal of NO and SO2 from Flue Gas by Ozone Oxidation and NaOH Absorption

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• 作者：Jia Zhang ; Rui Zhang ; Xin Chen ; Ming Tong ; Wanzhong Kang ; Shaopeng Guo ; Yanbo Zhou ; Jun Lu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：April 16, 2014
• 年：2014
• 卷：53
• 期：15
• 页码：6450-6456
• 全文大小：322K
• 年卷期：v.53,no.15(April 16, 2014)
• ISSN：1520-5045

文摘

Exhaust flue gas from fossil fuel combustion usually contains a large quantity of SO₂ and NO. In this paper, a process of simultaneous removal of NO and SO₂ by ozone oxidation combined with NaOH absorption was chosen. The main investigations involved O₃ decomposition, factors affecting NO oxidation (O₃ dosage, reaction temperature, NO initial concentration, and presence of SO₂), and NaOH absorption. The results indicated O₃ decomposition rate increased as temperature rose and was less affected by initial concentration of O₃. The optimal temperature for NO oxidation was 150 掳C. NO oxidation efficiency increased with the increase of O₃ dosage at a fixed temperature. NO initial concentration and the presence of SO₂ had a slight effect on NO oxidation. The NO oxidation efficiency remained above 90% when n_O3/n_NO was 1. Absorption by NaOH solution resulted in the final removal of above 99% NO, 90% NO₂, and nearly 100% SO₂ at pH above 11.