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Study the Process of Wire-to-Plate Pulsed Corona Discharge by Spectroscopy

Author: WangShenBing
Tutor: LuoZhongZuo；ZuoKeFa
School: Zhejiang University
Course: Engineering Thermophysics
Keywords: OH radicals Pulse corona discharge Emission spectra Laser-induced fluorescence
CLC: X701
Type: Master's thesis
Year: 2011
Downloads: 64
Quote: 0
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Abstract


Pulse corona discharge flue gas purification technology is emerging a variety of pollutants in the flue gas synergistic removal means. Pulse corona discharge the pollutants removal process in the spatial distribution of OH radical generation characteristics and its influencing factors and NO characteristics of many influencing factors for the pulse corona discharge a variety of pollutants synergistic removal technology optimization and application provided technical reference with support. In this paper, the use of emission spectrometry and laser induced fluorescence detection pulse corona discharge plasma in the OH radical and NO, the main study are as follows: for a more in-depth understanding of the line - plate pulse corona discharge reactor performance to emission spectra detected based OH (A2Σ → X2П) spectra confirm the pulse corona discharge in the presence of an OH radical. Study the spatial distribution characteristics of pulse corona discharge at atmospheric pressure OH radicals generated in the form of a wire electrode, wire line and line plate spacing and oxygen content of OH radicals. The diameter of the wire electrode results show that: the X-axis direction of the wire electrode of the OH radical quantity is less and less, the activation region radius is substantially 20mm, the Y-axis direction, first becomes bigger, smaller, the activation region is greater than 30mmm, the Z-axis direction is substantially the same; varied within a small range, OH radicals spectral intensity change is small, a diameter greater than 2mm, the sharp decline of the spectral intensity as the diameter increases. With the larger wire board spacing, OH radical emission intensity decreases. OH radical emission intensity is enhanced with increasing spacing of the wire line. With the increase of the oxygen content significantly decreased, especially the oxygen content greater than 10%, the OH radical emission spectrum 309nnm at peak basically disappeared. The use of emission spectra of NO (A2Σ, 0) → NO (X2П ,2-6) emission spectra of atmospheric pressure to downline plate pulse corona discharge NO removal process, mainly to study the spatial distribution of the emission intensity characteristics as well as NO concentration and other factors. NO emission spectral lines with the discharge peak voltage, pulse frequency increases enhanced. However, when frequency changes in the higher range, the emission intensity of the NO of the spectral intensity of a very small change of NO as the background gas in the NO concentration decreases significantly weakened. For concentrations of less than 200ppm, the spectral lines disappeared. 10mm radius area of ??the NO emission spectral lines mainly online electrodes X-axis direction, the Y-axis direction of 10 mm radius region over this area undetectable NO spectral signal. The experiment only qualitatively reflect the space distribution of the excited states of NO, NO removal process to accurately study the spatial and temporal distribution of new detection methods must be selected. Be seen to stimulate the NO transition of the energy required is higher than the OH radical. Pulse corona discharge at atmospheric pressure distribution characteristics as well as the oxygen content of OH radicals space generated basic research in laser-induced fluorescence techniques. Through the analysis of the experimental data and to explore the following conclusions were drawn: OH radicals relative concentration of various points on the X-axis direction away from the wire electrode smaller, but little change in the distribution area is larger than 30mm. However, from the Y-axis direction 10mm OH radical concentration trends for the first increases and then decreases, the largest concentration region is concentrated in the longitudinal 5mm near the rapid reduction of the OH radical concentration over this area. The OH radical concentration as the oxygen concentration increases, the first larger after the change is small, and when the oxygen concentration is about 10% when the concentration of OH radicals, oxygen concentration greater than 40%, OH radicals disappeared. Able to produce the most OH radicals due to the selection of the oxygen content of about 10%, so the oxygen content of the flue gas pollutants removal process can be selected for this condition.

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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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