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The Mechanism of Denitrification by Plasma with Different Background Gases in Clearing of the Flue Gas for NOX


Affiliations
1 School of Geology and Environment, Xi’an University of Science and Technology, Xi’an, 710054, China
2 China Heavy Machinery Research Institute Co. Ltd., Xi’an, 710032, China
 

The denitrification rate of NO by using dielectric barrier discharge plasma method with four different background gases, such as N2/NO/O2, N2/NO/O2/NH3, N2/NO/O2/NH3/SO2 and N2/NO was studied. The results showed that the denitrification rate of four kinds of background gas increases with the increase of power and the increase of the 20W~40W range was obvious. The NO was dislodged by active species N which was electrolysed from N2 in the N2/NO system. The greater the initial concentration of NO, the lower the initial denitrification rate. But the stable NO removal rate reached almost 100%. The greater the concentration of O2, the lower removal rate of NO and show that the removal of NO was blocked by O2 in the N2/NO/O2 system. Compared to the N2/NO system, the denitrification rate was decreased when added O2 in the system. The higher the concentration of NH3, the higher denitrification rate in the N2/NO/O2/NH3 system. And the NO was removed by NH and NH2 that was electrolysed from NH3. The removal rate was significantly improved compared with the N2/NO/O2 system. The competitive existence between SO2 and NO in the electrolysis reaction, resulted the denitrification rate decrease in the N2/NO/O2/NH3/SO2 system. And the greater the concentration of SO2, the lower the denitrification rate of NO.

Keywords

Plasma, Dielectric Barrier, Denitration, Background Gases.
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  • The Mechanism of Denitrification by Plasma with Different Background Gases in Clearing of the Flue Gas for NOX

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Authors

Lei Zhang
School of Geology and Environment, Xi’an University of Science and Technology, Xi’an, 710054, China
Jihao Chen
School of Geology and Environment, Xi’an University of Science and Technology, Xi’an, 710054, China
Xiangling Sha
School of Geology and Environment, Xi’an University of Science and Technology, Xi’an, 710054, China
Lei Zhang
China Heavy Machinery Research Institute Co. Ltd., Xi’an, 710032, China
Huibin He
School of Geology and Environment, Xi’an University of Science and Technology, Xi’an, 710054, China
Zhenhua Ma
School of Geology and Environment, Xi’an University of Science and Technology, Xi’an, 710054, China
Dan Yang
School of Geology and Environment, Xi’an University of Science and Technology, Xi’an, 710054, China

Abstract


The denitrification rate of NO by using dielectric barrier discharge plasma method with four different background gases, such as N2/NO/O2, N2/NO/O2/NH3, N2/NO/O2/NH3/SO2 and N2/NO was studied. The results showed that the denitrification rate of four kinds of background gas increases with the increase of power and the increase of the 20W~40W range was obvious. The NO was dislodged by active species N which was electrolysed from N2 in the N2/NO system. The greater the initial concentration of NO, the lower the initial denitrification rate. But the stable NO removal rate reached almost 100%. The greater the concentration of O2, the lower removal rate of NO and show that the removal of NO was blocked by O2 in the N2/NO/O2 system. Compared to the N2/NO system, the denitrification rate was decreased when added O2 in the system. The higher the concentration of NH3, the higher denitrification rate in the N2/NO/O2/NH3 system. And the NO was removed by NH and NH2 that was electrolysed from NH3. The removal rate was significantly improved compared with the N2/NO/O2 system. The competitive existence between SO2 and NO in the electrolysis reaction, resulted the denitrification rate decrease in the N2/NO/O2/NH3/SO2 system. And the greater the concentration of SO2, the lower the denitrification rate of NO.

Keywords


Plasma, Dielectric Barrier, Denitration, Background Gases.