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Optimisation de réacteurs à plasmas non-thermiques pour le traitement des oxydes d'azote

Abstract : Despite recent technological advances, thermal combustion in vehicles still generates a large amount of polluting gases that pure catalytic systems are unable to treat efficiently during the various phases of motor function. Nitrogen oxides are among the more problematic of the polluting gases, and a solution for their removal is critical. This work is aimed at the implementation of a solution using non-thermal plasma. The control and understanding of electrical discharges in gas enables to generate non-thermal plasmas, where only the electrons are raised to a high temperature. A non-thermal plasma treatment does not significantly heat the gas, but it still triggers important molecular changes. Under the influence of intense electric fields and depending on the initial gas composition, nitrogen oxides are either oxidized or reduced. In order to increase the gas reactivity, different geometric configurations of the reactors have been optimized and implemented. The optimization of each configuration is based on calculations of the electrostatic field, for which the amplitude of applied voltage was kept lower than 20 kV . Some of the reactors were constructed with dielectric barriers with varying arrangements, sizes, and materials. To evaluate reactor treatment efficiency of nitrogen oxides, a specialized experimental bench was constructed. Different voltage sources were tested, and the discharge was analyzed via voltage and current measurements. The experiments showed that 80 % of the nitrogen oxides in nitrogen could be reduced using a wire cylinder configuration with a suitable intermediate frequency AC voltage source.
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Submitted on : Friday, February 18, 2011 - 2:46:04 PM
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  • HAL Id : tel-00567149, version 1


yoann-Nicolas Jaffré. Optimisation de réacteurs à plasmas non-thermiques pour le traitement des oxydes d'azote. Sciences de l'ingénieur [physics]. Ecole Centrale de Lyon, 2010. Français. ⟨tel-00567149v1⟩



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