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Etudes expérimentales et numériques de la pyrolyse et l’oxydation du charbon pulvérisé dans les flammes étirées de méthane/oxygène/azote

Abstract : In the present work, a laboratory-scale laminar strained configuration is used to investigate the characteristics of pulverized coal devolatilization and oxidation in a mixture of CH4/O2/N2 reactive flow both in conventional air conditions and in oxygen-enriched combustion conditions. Two optical diagnostics, Flame Emission Spectroscopy and measurement of spontaneous emission, are employed for the characterization of flame structure. The spatial concentration evolution of three excited radicals, OH*, CH*and C*2 , are measured and analyzed.1-D simulations using detailed gas-phase kinetics including OH*, CH*, and C*2 sub-mechanisms and coal combustion submodels are performed and compared with experimental data. Qualitative comparison with experiments showed that the current numerical configuration was suitable for the prediction of OH*, CH* and C*2 emission. The predicted results differed with changes to the coal sub-models and kinetic parameters. The devolatilization model and volatile matters seem to play more important roles.
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Meng Xia. Etudes expérimentales et numériques de la pyrolyse et l’oxydation du charbon pulvérisé dans les flammes étirées de méthane/oxygène/azote. Autre. Université Paris-Saclay, 2017. Français. ⟨NNT : 2017SACLC060⟩. ⟨tel-01677737⟩

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