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Filtration d’aérosols de suie en présence de vapeur et/ou de gouttelettes d’eau

Abstract : One of the most frequently used methods to purify air contaminated by particles, in many industrial processes, is filter media. These collective equipment for protecting people and the environment are proven in terms of initial efficiency, but their behavior over time remains difficult to predict. This is all the more noticeable when these devices are confronted with a biphasic aerosol composed of solid and liquid particles. These situations can be encountered during metals machining, pesticides spreading or even during fires in confined areas such as nuclear power plants. The proposed study will aim to establish the performance of a fibrous media with respect to biphasic aerosols with nanostructured solid particles and droplets (submicron or micron-sized). If the filtration of solid aerosols or liquid aerosols is relatively well documented in the literature, no study has been interested in this problem of biphasic aerosols. For high solid / liquid ratios, the time course of the pressure drop should be close to solid aerosols filtration evolution, ie a quasi-linear increase over time. In the case of an aerosol predominantly made up of droplets, a constant pressure drop overtime, characterized by a state of equilibrium between the mass flow rate of collected droplets and the flow rate of liquid drained on the downstream face of the filter, could be considered . But what about the evolution of the pressure drop between these two extremes? The determination of the temporal evolution of the collection efficiency is also uncertain and should be regarded as a real metrological challenge.
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Charlotte Godoy. Filtration d’aérosols de suie en présence de vapeur et/ou de gouttelettes d’eau. Génie des procédés. Université de Lorraine, 2019. Français. ⟨NNT : 2019LORR0287⟩. ⟨tel-02559065⟩

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