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Séparation des particules ultrafines métalliques par lits granulaires

Abstract : The air of workplaces and the environment can be contaminated by ultrafine particles (UFP) coming mainly from a non-intentional generation emitted by some industrial processes. The toxicity of these particles being more and more admitted nowadays, the polluted air of the workplaces has to be extracted and filtered in order to protect the workers and the public, respectively. The commonly used filters are pleated fiber filters which are rapidly and sometimes irreversibly clogged by the UFP. In order to find an alternative to these pleated filters, it was decided to study the granular beds. To do so, the clogging kinetic of granular bed by UFP was studied. This was achieved by conducting both macroscopic and microscopic studies of the granular bed clogging consisting in the monitoring of the evolution of the performances and in performing visualizations of UFP deposit structures. Evaluate the ability of granular beds to be an alternative to fiber filters can require the knowledge of the granular bed performances evolution for a large number of configurations. In order to avoid the realization of the corresponding experiments, a theoretical model was developed. Then, this model permitted by a multi-criteria optimization method to find the optimal configuration of an improved granular bed. Finally, some preliminary and very promising tests of a cylindrical granular bed filter permitting to increase the surface filtration and the collection efficiency laid the groundwork of a potential use of granular beds for the industrial UFP filtration
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Submitted on : Monday, December 11, 2017 - 11:20:54 PM
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Loïc Wingert. Séparation des particules ultrafines métalliques par lits granulaires. Génie chimique. Université de Lorraine, 2017. Français. ⟨NNT : 2017LORR0019⟩. ⟨tel-01661392⟩

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