Decomposition and re-synthesis of NOX in non-equilibrium plasma in nitrogen-oxygen mixtures containing water vapour
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Department of Chemical Technology, Lublin Technical University, 20-618 Lublin, ul. Nadbystrzycka 40, Poland
Publication date: 2021-04-07
Acta Agroph. 2002, (80), 133–140
Processes of nitrogen oxides decomposition in non-equilibrium plasma generated in electrical discharges are accompanied by a re-synthesis of nitrogen oxides. Fathoming of the effect of HV feeder electrical parameters and of gas composition on the NO re-synthesis process can help to inhibit the process and to obtain a higher degree of the NO decomposition and more efficient utilisation of electrical energy that feeds a reactor. Tests have been performed in a flat reactor with a quartz dielectric (discharge gap of 1 mm) fed with alternate voltage (50-4500 Hz) of 10.0 kV. Feeding gas consisted of 9 to 95% of O2, 0-8000 ppm of H2O with the remaining part being nitrogen. An analysis of gas composition at the reactor outlet has been performed with a mass spectrometer and it has shown that among the synthesis products aside with ozone there also are N2O, NO, NO2 and N2O5 there. Along with a growing feeding voltage value the total NOX concentration increases. The highest total NOX concentration values have been obtained at the 38% oxygen content in the mixture. Further increase of the oxygen content in the mixture causes a decrease of the N2O concentration. An increase of the vapour content causes a decrease of the N2O and NO2 concentrations. The obtained results indicate that in the process of NOX removal from flue gases it is possible to inhibit the NOX re-synthesis by an adequate selection of the HV feeder parameters and the composition of a gas that is subdued to the discharge action.
Rozkład i re-synteza NOX w plazmie nierównowagowej w mieszaninach azotowo-tlenowych zawierających parę wodną
synteza tlenków azotu, rozkład NO, wyładowania barierowe
Procesowi rozkładu NO, w plazmie nierównowagowej towarzyszy powtórna synteza tlenków azotu. Celem pracy było poznanie wpływu warunków zasilania elektrycznego, składu mieszaniny azotowo-tlenowej i obecności pary wodnej na przebieg syntezy NOX . Uzyskane rezultaty wskazują na możliwość ograniczenia wtórnej syntezy NOX poprzez odpowiedni dobór zasilania elektrycznego i obecność pary wodnej.