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Contribution à la modélisation du comportement chimique des aérosols issus d'un feu de sodium par le modèle d'absorption réactive

Abstract : The use of liquid sodium, as a coolant in Sodium cooled Fast Reactors (SFR) circuits, requires studying the consequences of a sodium fire for safety analysis, and particularly the toxicological impact of sodium fire aerosols. More particularly, the carbonation of sodium fire aerosols from sodium hydroxide (NaOH) to sodium carbonate (Na$_2$CO$_3$) is investigated. A new kinetic model based on the CO$_2$ reactive absorption, and the two-film theory was developed to describe the carbonation process of NaOH solutions, in order to take into account the NaOH aerosols’ initial characteristics in equilibrium with the atmosphere. This model was applied for the case of NaOH aerosols, considering the CO$_2$ absorption at the particle external surface. By comparisons with experimental data, the model was validated over the range studied of relative humidity and initial particle diameter. However, the values of the interfacial area need to be consolidated and justified. The modelling validation needs also to be completed, looking forward the next experimental data.
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A. Plantamp, T. Gilardi, H. Muhr, C. Perrais. Contribution à la modélisation du comportement chimique des aérosols issus d'un feu de sodium par le modèle d'absorption réactive. Colloques conjoints Science et Technologie des Poudres (STP) et Poudres et Materiaux Frittés (PMF), Apr 2015, Nancy, France. ⟨cea-02509074⟩

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