CIESC Journal ›› 2016, Vol. 67 ›› Issue (5): 2041-2047.doi: 10.11949/j.issn.0438-1157.20151536

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Simultaneous removal of SO2 and NOx by combination of ozone oxidation and Na2S2O3 solution spray

YANG Ye, XU Chaoqun, ZHU Yanqun, LIN Fawei, MA Qiang, WANG Zhihua, CEN Kefa   

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2015-10-12 Revised:2015-11-25 Online:2016-05-05 Published:2015-12-16
  • Supported by:

    supported by the National Basic Research Program of China (2012CB214906) and the National Science Fund for Distinguished Young Scholars of China (51422605).

Abstract:

Ozone oxidation and Na2S2O3 solution spray was combined to remove SO2 and NOx simultaneously. This coupling was studied experimentally. The results show that: SO2 and NOx can be eliminated simultaneously; at O3/NO mole ratio 1.1—1.2, the NOx removal efficiency increases with increasing concentration of Na2S2O3; existence of SO2 can facilitate removal of NOx; the NOx removal efficiency reaches 70% with low emission of SO2 at Na2S2O3 concentration 2.0% and at SO2 gas concentration 1030 mg·m-3. Furthermore, the NOx removal efficiency is enhanced with the pH of solution from 2.5 to 9, and reaches 75% at pH 9. The result of 3 hours running experiment indicates that NOx and SO2 can be removed efficiently and simultaneously and the stable and continuous operation is possible, because sodium thiosulfate can facilitate removal of NOx and the NOx is dominantly converted into NO2-. This process could be an efficient approach for eliminating SO2 and NOx simultaneously and could have potential industrial application.

Key words: ozone oxidation, pollution, flue gas, simultaneous removal of SO2 and NOx, sodium thiosulfate, absorption

CLC Number: 

  • X511

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