Caractérisation et filtration des aérosols nonastructurés : application aux fumées de projection thermique des métaux

Abstract : This study deals with the filtration of metallic particles contained in the metallization fumes. Experience feedback specific to the filtration of metallization fumes by dust collectors report a rapid clogging of filters and the inefficiency of pneumatic cleaning techniques commonly used. This leads to a high reduction in filters lifetime. The objective of this study is characterize clogging then unclogging in order to improve the performance of dust cartridge filter against metallization fumes. Three research axes were explored on a dedicated bench : -Metallization fumes characterization. It allows describing the spatial structure of the particle by the fractal dimension and the dynamic shape factor with the DMA-ELPI serial coupling and thanks to an original data analysis methodology validated on various aerosols. The characteristics obtained explain the clogging properties of metallization fumes. -Characterization of the cake generated during the filtration phase (or clogging). It shows a incompressible structure in the velocities filtration range of industry. The experimental porosity of the cake formed by filtering metallization fumes is estimated thanks to these studies. -Study on cleaning. It describes and explains the inefficiency of pneumatic cleaning techniques employed in industry. It appears that only a very small surface of the pleated media is unclogged. The precoating alternative is shown to be very efficient provided that it is combined with off-line cleaning procedures
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Florence Grippari. Caractérisation et filtration des aérosols nonastructurés : application aux fumées de projection thermique des métaux. Alimentation et Nutrition. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0158⟩. ⟨tel-01749361⟩

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