Diagnosis of OH Radical by Optical Emission Spectroscopy in Atmospheric Pressure Unsaturated Humid Air Corona Discharge and its Implication to Desulphurization of Flue Gas

Abstract

OH radical in the corona discharge with pipe-nozzle-plate electrode has been diagnosed by optical emission spectroscopy. Spatial variations of OH radical emission in discharge gap have been measured. Relative intensity of OH radical emission spectroscopy increases with increasing water vapor flux injected into the reactor or intensity of electric field supported. In positive pulsed corona discharge, relative intensity is higher than that in positive DC corona discharge and lower than that in negative DC corona discharge. Strongest intensity of OH radical spectrum appears within the range of 5 mm near the discharge nozzleelectrode. In addition, it is proved that the efficiency of desulphurization from flue gas by pulsed corona discharge plasma processes can be improved when OH radical is produced in the reactor.

The influence of relative humidity on double dielectric barrier discharge plasma for chlorobenzene removal

“…However, it is difficult to detect the emission of OH(A-X) at 308 nm, which has been also reported in other work (Ye et al, 2017). It was probably due to the fact that the quenching of excited OH radicals by oxygen, nitrogen and water molecules is much faster than the de-excitation processes to the ground state (Sun et al, 2005;Yao et al, 2016), making it very difficult to observe OH in the spectra, although it is certainly that OH radicals are present in air/H 2 O plasma discharge. On the other hand, the excited oxygen atoms at transition 5 S 0 / 5 P, 777 nm can be observed in Fig.…”

“…The active species generated in the plasma discharge process play a very important role in removing gaseous pollutants for their strong redox property (Sun et al, 2005). However, the action mechanism of active species in the CVOCs removal process is not very clear, especially at high humidity conditions which is one of the main scopes of the current research work.…”

Enhancement of Hydrogen Evolution from Water Photocatalysis Using Liquid Phase Plasma on Metal Oxide-Loaded Photocatalysts

“…Plasma reforming is generally performed in the gas phase. Discharge in a liquid has been used in water treatments based on its simple electrical configuration. − Similar technical approaches can be applied to liquid hydrocarbon reforming. , On the other hand, there are few reports on its application to hydrogen production by photocatalysis. Discharge in a liquid can generate a higher density plasma and larger spatial distribution compared to UV lamp irradiation. , These advantages can lead to the decomposition of raw materials and hydrogen production.…”

Measurement of Hydroxyl Radicals in Air Negative Pulse Discharge with Nozzle-Cylinder Electrode

“…For examples, Sun Bing reported the active species in water discharge process [6] . Sun Ming et al measured the hydroxyl radicals by optical emission spectroscopy (OES) with needle-plate electrode [7] . Ono et al did a lot of research about the measurement of the hydroxyl radicals by laser induced fluorescence [8][9] .…”