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The Optical Measurement of OH Radicals in the Process of Pulsed Corona Discharge

Author: WeiBo
Tutor: LuoZhongZuo；YuChunJiang
School: Zhejiang University
Course: Engineering Thermophysics
Keywords: Pulse corona discharge OH radicals Emission spectra Planar Laser Induced Fluorescence ICCD imaging
CLC: O461
Type: Master's thesis
Year: 2010
Downloads: 50
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Abstract


This paper describes the emission spectroscopy system and planar laser-induced fluorescence (PLIF, Planar Laser Induced Fluorescence)-ICCD imaging combined with measurements of OH radicals in the process of pulse corona discharge, aim through the process of pulse discharge OH radicals measurement, study of OH radicals, a chemical reaction with other substances, the mechanism of physical reactions and disappear clear synergistic removal process of a variety of pollutants play a key role in the pulse discharge, and validate the various the impact of the factors on the generation of OH radicals, understand the variation of the formation of OH radicals with a variety of factors, synergistic removal pulse discharge a variety of pollutants technology to provide reference and support. This paper: the first to use the the Fluent tools to simulate the gas flow rate distribution in the reactor, according to the simulation results to optimize the design of the reactor. Consider the optical path laser-induced fluorescence measurement system requirements, the final choice from the reactor into the wind the middle of the intake side of the mixing section, the rear side of the middle at the outlet of the flow field settings. In addition, the gas mixing area and discharge area of ??the reactor needs to be arranged between the air distribution plate for better gas uniform and stable flow. Gas inlet flow velocity inside the reactor increased gas velocity, but the gas flow rate variation in the discharge region of the center of the reactor. 2 by means of emission spectra, the OH radical in the process of pulse discharge in air, nitrogen, argon context measurement of pulse peak voltage, the frequency of the pulse discharge, background gas of humidity on the generation of OH radicals generated impact, and to study the characteristics of the discharge electric field in the space distribution of the OH radical. Experiments show that the increased amount of OH radicals generated with the pulse-peak voltage and pulse discharge frequency increases; different background gases, the impact of humidity on the generation of the OH radicals is not the same, the relative concentration of the OH radical in a relative humidity of the air with the gas increases, the relative humidity increases in nitrogen with the gas first increased and then a decreasing trend, but with argon gas relative humidity increases, first decreased and then increased; OH The relative concentration of radicals in the discharge electric field is gradually reduced as the spacing increases in the center of the lens and the wire electrode of the spectrometer. Finally, try to measure the concentration of OH radicals in the the air background through into the next SO2 and NO found in this background conditions, OH radicals has been basically difficult. Perfected the design and build of the laser-induced fluorescence measurements associated with ICCD imaging system, laser-induced fluorescence measurements, pulse peak voltage in the context of air, nitrogen, argon, OH radical two-dimensional gas humidity changes OH radical concentration of the variation in the distribution, to study changes in O2 content, and the OH radical in the presence of SO2 and NO were measured. Experiments in different gas background, the two-dimensional distribution of OH radicals, the validation pulse peak voltage and gas humidity OH radical generation process, and prove that O2 content is more, the less amount of OH radical generation. Experiments found the SO2 in the measurement process so that the ICCD dramatic increase in the intensity of the received light, affecting the measurement results, and the presence of NO when the OH radical content is very low, and the content of NO is more, the OH radical quantity is less. Measurement of OH radicals to carry H2O carrier gas flow control under inert gas conditions do background, but there are few precise humidity monitoring and control of measurement, and there is little The study was accurate spatial scale measurement of the distribution of OH radicals in the discharge reaction space, so this article focuses on these two aspects of measurement studies, and try to SO2 and NO exist in the case of OH radicals measurements pulse discharge collaborative play a reference role in the removal the multiple pollutants technology research. Most radical measurements using emission spectroscopy system, the main innovations of this paper is the use of laser-induced fluorescence measurements and ICCD imaging system associated with the design and construction of the system, to master the the PLIF system and ICCD imaging associated with the technology, and laid the foundation for subsequent measurement work.

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CLC: > Mathematical sciences and chemical > Physics > Vacuum Electronics (Electronic Physics ) > Gas discharge ( gas conductivity )
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