- Marquidia PACHECO, Instituto Nacional de Investigaciones Nucleares de Mexico – Mexico, MEXIQUE
- Mario PONCE, Technologico Nacional de Mexico – Mexico, MEXIQUE
- Carlos RAMOS, Universidad Nacional de Colombia – Medellin, COLOMBIE
- Artura FAJARDO, Pontificia Universidad Javeriana – Bogota, COLOMBIE
- Rafael DIEZ, Pontificia Universidad Javeriana – Bogota, COLOMBIE
- David FLOREZ, Pontificia Universidad Javeriana – Bogota, COLOMBIE
- Hubert PIQUET, Toulouse INP – laboratoire LAPLACE – Toulouse, FRANCE
This doctoral thesis contributes to the treatment of nitrogen oxides (NOX) with cold or non-thermal plasma using dielectric barrier discharge (DBD) by evaluating the use of the square voltage power supply (SVPS) for this application. Although this power supply is widely used by DBD researchers, so far, no study has explained theoretically how the power supply components affect the plasma behavior in the DBD.
In order to understand the interaction between the source and the DBD, a circuit model is proposed that includes the step-up transformer parasitic components, the full bridge inverter, and DBD electrical model. After performing a circuit analysis using the state plane, a set of equations was obtained that allows us to calculate the electrical characteristics of the DBD, such as the average power delivered by the source, the duration of the discharges, and the peak voltage at the DBD, which, when compared with experimental data in two types of DBD, present errors lower than 10 %, for several operating points.
These equations also allow adequate SVPS size for DBD applications, where the objectives to be met correspond to the electrical characteristics of the discharges. We propose a design methodology for the power supply that was experimentally tested in an experimental NOX treatment bench and show a theoretical design for a PM treatment bench.
Considering the importance of making advances in NOX treatment methods given the environmental and health issues that NOX emissions currently cause, we present an experimental study on the effect of the electrical parameters of the SVPS, such as the duration of the current pulse during discharge, on NOX abatement in an experimental bench. This study showed that it is possible to find operating points of the source that produce a NO removal in the laboratory bench close to 100%.
