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NO Dissociation Process of Pulse Discharge in N2 Environment

Author: LiuFengLiang
Tutor: ZhangLianShui
School: Hebei University
Course: Atomic and Molecular Physics
Keywords: Pulsed Streamer Discharge Dielectric barrier discharge Boltzmann plot method
CLC: X511
Type: Master's thesis
Year: 2010
Downloads: 18
Quote: 0
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Abstract


Today's society that are extremely harmful to human health, one of the polluting gases in the atmosphere is NO. People's awareness of environmental protection has been greatly improved, and how to make the technology become important target of NO governance NO removal more economically reasonable. NO as the main object of study of this thesis, pulse streamer discharge and dielectric barrier discharge mode by NO fluorescence emission spectra comparison, the dynamics of NO gas removal process. This means of emission spectra of Ar, the first standard atmospheric pressure, pulse streamer discharge plasma characteristics experimental study of N2 gas mixed with a small amount of Ar atoms on income, based on the attribution of Ar atomic fluorescence spectra were used the spectrum relative fluorescence intensity ratio method, the Boltzmann plot method and Fermi - Dirac Kebu Habitat distribution model law three calculation methods is compared with standard atmospheric N2 pulse streamer discharge plasma electronic excitation temperature. The results show that: Boltzmann plot method and Fermi - Dirac Kebu Habitat distribution models, calculated electronic excitation temperature is very close, were (7474 ± ??500) K and (7480 ± 500) K, this study involves pulse streamer discharge plasma at least close to local thermal equilibrium. then, in negative pulse streamer discharge and dielectric barrier discharge two modes, the fluorescence of NO by the relatively pure NO and N2 environment emission spectra to explore the pulse streamer discharge removal of NO dynamic processes. The results show that: in the negative pulse streamer discharge, the dissociation product of NO in the excited state of N atoms and O atoms, N atoms then combined and the other N atom to become excited state N2; while O atoms in combination with other O atom Be O2. After joining the N2 and found no changes in the product particles. Dielectric barrier discharge, NO molecules first inelastic ionizing collisions with energetic electrons into NO ion and subsequent NO dissociation into N and O; N ions in the cathode during exercise combined with electron into excited states of N atoms turn and the other N atom combined into excited states N2; O atoms in combination with other O atoms become O2. Joined the N2, nor found changes in the product particles. Are in the negative pulse streamer discharge and dielectric barrier discharge in two streamer discharge mode, NO in Solutions from the channel process is completely different from the two reaction channel, and the adding of N2 does not change the channel of the NO dissociation. CO is the main product of the combustion process, the present study also examined the effects of NO removal of CO gas, to add CO gas in the negative pulse streamer discharge and dielectric barrier discharge two discharge mode, O atomic fluorescence spectrum significantly reduced or even disappear. described CO captured the O atom of NO dissociation generated, indicating that the addition of CO gas conducive NO removal.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Atmospheric pollution and its control > Gas pollutants
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