首页|Simultaneous removal of sulfur dioxide and nitrogen oxide from flue gas by phosphorus sludge:The performance and absorption mechanism
Simultaneous removal of sulfur dioxide and nitrogen oxide from flue gas by phosphorus sludge:The performance and absorption mechanism
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Developing low-cost and green simultaneous desulfurization and denitrification technologies is of great significance for sulfur dioxide(SO2)and nitrogen oxide(NOx)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 simulta-neously eliminate SO2 and NOx 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 tem-perature 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 SO2 is attributed to the abundance of iron(Fe3+)and manganese(Mn2+)in the absorbent.SO2 can be rapidly catalyzed and converted to SO4-by them.The key to NOx removal is the oxidation of NO toward water-soluble high-valent nitrogen oxides by oxidizing reactive substances induced via yellow phosphorus,which are then absorbed by water and converted to NO3-.Meanwhile,yellow phosphorus is oxidized to phosphoric acid(H3PO4).The spent absorption slurry can be reused through wet process phosphoric acid production,as it contains sulfuric acid(H2SO4),nitric acid(HNO3),and H3PO4.Accordingly,this is a technology with broad application prospects.
AbsorptionOxidationMultiphase reactionPhosphorus sludgeYellow phosphorusLow temperature
Yuanyuan Yin、Xujun Wang、Lei Xu、Binbin He、Yunxiang Nie、Yi Mei
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Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China
Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials,Kunming 650500,China
The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province,Kunming 650500,China
国家自然科学基金Yunnan Major Scientific and Technological Projects
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