Étude expérimentale et modélisation de la réduction du minerai de fer par l'hydrogène

Abstract : In an effort to find new ways to drastically reduce the CO² emissions from the steel industry (ULCOS project), the reduction of iron ore by pure hydrogen in a shaft furnace was investigated. The work consisted of literature, experimental, and modelling studies. The chemical reaction and its kinetics were analysed on the basis of thermogravimetric experiments and physicochemical characterisations of partially reduced samples. A specific kinetic model was designed, which simulates the successive reactions, the different steps of mass transport, and possible iron sintering, at the particle scale. Finally, a 2-dimensional numerical model of a shaft furnace was developed. It depicts the variation of the solid and gas temperatures and compositions throughout the reactor. One original feature of the model is using the law of additive characteristic times for calculating the reaction rates. This allowed us to handle both the particle and the reactor scale, while keeping reasonable calculation time. From the simulation results, the influence of the process parameters was assessed. Optimal operating conditions were concluded, which reveal the efficiency of the hydrogen process
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Damien Wagner. Étude expérimentale et modélisation de la réduction du minerai de fer par l'hydrogène. Autre. Institut National Polytechnique de Lorraine, 2008. Français. ⟨NNT : 2008INPL004N⟩. ⟨tel-01753016⟩

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