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Filtration des particules issues des moteurs Diesel par matrices fibreuses plongées dans un champ électrique

Abstract : The filtration of diesel particulate matter is a major industrial and environmental stake, since the discovery of carcinogenic effects of this kind of particles and the advent of Euro IV (2005) and Euro V (2008-2010) regulations. The aim of this study is to point out the industrial practicability of filtration of these particles by a fibrous media immersed in an electric field. The global shape of this process is a wire-to-cylinder electrostatic precipitator with a porous earth collecting electrode, the whole flow passing through it. It was shown that this process is essentially an agglomerator and not a filter and that it allows an increase by 50 of the mean diameter of particles. The process, by its completely new and original shape, allows working with only several millisecondes of residence time. The energetic intensity is so important that the whole volume is compatible with an installation on vehicles. On a technical point of view, the efficiency of this electrostatic agglomerator depends only little on the fibrous matrices or high voltage electrodes used. It is in return very influenced by the quality of electric insulation by ceramic plugs between the canning and high voltage electrodes, and by the discharge polarity. During the last tests with a very optimised agglomerator, we obtain a decrease of 90% in number of the submicronic particulate matter (on a NEDC cycle), with a fuel over-consumption of less than 1%, which corresponds to an “volumic energy” of about 1 Joule per litre. A mathematical model of agglomerator was constructed during this study, integrating the last recent improvements in numeric simulation of Maxwell's equations in presence of space charge, integrating the particle turbulence and taking into account the fractal dimension of diesel aerosol particles. The process is nowadays in an advanced industrialisation stage.
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Contributor : Raphaël Boichot <>
Submitted on : Wednesday, March 12, 2008 - 6:10:14 PM
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Raphaël Boichot. Filtration des particules issues des moteurs Diesel par matrices fibreuses plongées dans un champ électrique. Génie des procédés. Université de Savoie, 2005. Français. ⟨tel-00263658⟩

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