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Simultaneous removal of sulfur dioxide and nitrogen oxide from flue gas by phosphorus sludge:The performance and absorption mechanism

查看全文 作　　者：Yuanyuan [1,2,3]Yin;Xujun [1,2,3]Wang;Lei [1,2,3]Xu;Binbin [1,2,3]He;Yunxiang [1,2,3]Nie;Yi [1,2,3]Mei 高影响力作者 机构地区：[1]Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China;[2]Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials,Kunming 650500,China;[3]The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province,Kunming 650500,China高影响力机构 出　　处：《Chinese Journal of Chemical Engineering》索引2024年第65卷第1期,共10页高影响力期刊 基　　金：The National Natural Science Foundation of China (22068019);Yunnan Major Scientific and Technological Projects (202202AG050001) 摘　　要：Developing low-cost and green simultaneous desulfurization and denitrification technologies is of great significance for sulfur dioxide(SO_(2))and nitrogen oxide(NO_(x))emission control at low temperatures,especially for small and medium-sized coal-fired boilers and furnaces.Herein,phosphorus sludge,an industrial waste from the production process of yellow phosphorus,has been developed to simultaneously eliminate SO_(2)and NO_(x)from coal-fired flue gas.The key factors affecting the experimental results indicate that desulfurization and denitrification efficiency of over 95%can be achieved at a low temperature of 55℃.Further,the absorption mechanism was investigated by characterizing the solid and liquid phases of the phosphorus sludge during the absorption process.The efficient removal of SO_(2)is attributed to the abundance of iron(Fe^(3+))and manganese(Mn^(2+))in the absorbent.SO_(2)can be rapidly catalyzed and converted to SO_(4)^(2-)by them.The key to NOx removal is the oxidation of NO toward watersoluble high-valent nitrogen oxides by oxidizing reactive substances induced via yellow phosphorus,which are then absorbed by water and converted to NO_(3)^(-).Meanwhile,yellow phosphorus is oxidized to phosphoric acid(H_(3)PO_(4)).The spent absorption slurry can be reused through wet process phosphoric acid production,as it contains sulfuric acid(H_(2)SO_(4)),nitric acid(HNO_(3)),and H_(3)PO_(4).Accordingly,this is a technology with broad application prospects. 关 键 词：ABSORPTION OXIDATION Multiphase reaction Phosphorus sludge Yellow phosphorus Low temperature
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