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Vanesa RUEDA’s Thesis Defense

par Laurence Laffont - publié le

Vanesa RUEDA’s thesis defense, intitled Reduction of Nitrogen Oxides in Diesel Exhaust Using Dielectric Barrier Discharges Driven by Current-Mode Power Supplies, lwill be held on Wednesday, May 11th 2022 at 3:00pm.
This thesis was supervised by Hubert PIQUET from GENESYS in partnership with INPT and Javeriana University.

The thesis defense will be held exclusively on TEAMS.

Jury :
M. Rosendo PENA, Institut National de la Recherche Nucléaire (Mexico), Rapporteur
M. Alejandro GARCES, Université Tecnológica de Pereira (Colombia), Rapporteur
Mrs Françoise MASSINES, CNRS-PROMES (France), Reviewer
M. Diego PATINO, Javeriana University (Colombi), Reviewer
M. Hubert PIQUET Thesis supervisor
M. Rafael DIEZ Thesis supervisor.

Abstract :
This work aims to implement a solution employing current-mode power supplies instead of the traditional voltage-mode approach to address the challenge of enhancing the NOx treatment based on Dielectric Barrier Discharges (DBD). At first, an experimentation power supply capable of delivering square current pulses with several degrees of freedom is implemented. The sizing, analysis with parasitic elements, and design of the power supply are fully developed. With the proposed power supply, the DBD electric operation is controlled through the following degrees of freedom : current amplitude, frequency, and duration of the pulses, as well as the number of current pulses injected into the DBD and idle time between groups of pulses. The parametric study of the electric and gas conditions is performed using an automated test bench, which standardizes the experiments and simplifies the data acquisition. A methodology is proposed for the data analysis, including the electrical diagnostic of the DBD, the gases analysis, and the image processing of the discharge pictures. The experimental results showed a decisive role of the zero-voltage idle time to guarantee a uniform gas treatment, a discharge spread in the whole reactor surface, and low reactor temperatures. The impact of the other electric parameters was also studied to optimize the removal efficiency. In a NO/N2 gas mixture, removal efficiencies of up to 100% were obtained. The effect of the O2, total gas flow, and NO concentration are analysed as well.