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Theses

Étude de la régénération par jet-pulsé des cartouches filtrantes colmatées par des particules ultrafines métalliques

Abstract : Metallurgical processes such as thermal spraying, metal cutting and arc welding emit high concentrations of ultrafine metallic particles, number concentrations that can reach 108 particles.cm-3 with diameters less than 100 nm. The efficient removal of these particles is of importance to ensure air quality in work places and to prevent their release into the environment due to their toxicity. Filtration of ultrafine metallic particles is currently problematic. Negative feedbacks have been made about the inefficient cleaning and the rapid clogging of filters. Failing to clean the filters surface implies that a recurrent replacement is required, which can be very expensive. This study is focused on evaluating the pulse jet cleaning efficiency and improving the regeneration of filters by the use of the precoating technique, which consists of protecting the filter surface with a layer of micron-sized particles that is easily discharged. Experiences are conducted using a pilot thermal metal spraying process by electric arc that allows reproducing the real conditions encountered at an industrial scale, on flat and pleated filters. The influence of different parameters on the cleaning efficiency is studied: deposited mass, air cleaning pressure, aging of the filter cake, filter surface treatment, precoating application, the pleat number and the cleaning mode. Results revealed the strong adhesion of the nanostructured filter cake to filter surface, the cleaning efficiency does not surpass 30 %. The application of precoating allowed to significantly improve the cleaning efficiency to reach 90 % and to stabilize the filtration process. The use of this technic was validated using pleated filter cartridges.
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https://hal.univ-lorraine.fr/tel-03632933
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Submitted on : Wednesday, April 6, 2022 - 4:01:14 PM
Last modification on : Thursday, April 7, 2022 - 3:34:06 AM

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DDOC_T_2021_0194_KHIROUNI.pdf
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  • HAL Id : tel-03632933, version 1

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Nassim Khirouni. Étude de la régénération par jet-pulsé des cartouches filtrantes colmatées par des particules ultrafines métalliques. Génie des procédés. Université de Lorraine, 2021. Français. ⟨NNT : 2021LORR0194⟩. ⟨tel-03632933⟩

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