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Research on the Influences of Desulfuration and Denitration under Different Flue Gas Composition by Dielectric Barrier Discharge Plasma

Author: DuXu
Tutor: SunBaoMin
School: North China Electric Power University
Course: Thermal Power Engineering
Keywords: Non-thermal plasma dielectric barrier discharge ethylene nitric oxide sulfur dioxide
CLC: X701
Type: Master's thesis
Year: 2012
Downloads: 96
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Abstract


Using Non-thermal plasma to remove nitrogen oxide and sulfur oxide in flue gas is one of the most promising flue gas comprehensive treatment technologies, and the dielectric barrier discharge technology is always used to produce Non-thermal plasma because it can be run under the atmospheric pressure, so it has good prospects and applications in air pollution control area. This paper used a coaxial cylindrical dielectric barrier discharge reactor to generate Non-temperature plasma, make a small experimental device to configurate simulated flue gas, The experiment was conducted to find out the influence of different gas compositions on NO and SO2removal in the existence of ethylene. The results show that the addition of ethylene may greatly promote NO oxidation, and the main oxidation product is NO2; Adding ethylene also can promote SO2oxidation efficiency to some extent when NO and SO2both in the flue gas; CO2will influence NO removal rate, but the effects are more limited; By adding water, the oxidation of NO and SO2finally be promoted and give HNO3and HNO2as the major products of NO; There is no interaction for the transformation of NO reaction when CO2and H2O are coexisting in flue gas, so it has little of impact for NO conversion efficiency; The increase of SO2concentration will delay the NO oxidation rate, but does not affect the NO final removal rate; SO2is the most important factor for affecting NO conversion efficiency when SO2, H2O and CO2are coexisting in flue gas. In this paper NO removal efficiency have been improved greatly by adding ethylene, and there also discussed the conversion reactions of SO2and NO when they were both in flue gas, the experiment results will provide theoretical and experimental basis for the the industrial applications of desulfurization and denitration in dielectric barrier discharge process.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization
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