Unsteady three-dimensional numerical simulations of methane combustion in dense fluidized bed
Résumé
Natural gas combustion in dense fluidized beds containing inert particles involves complex physical mechanisms related to the bed hydrodynamic coupling with the gaseous combustion. In their experiments, Dounit et al. (Powder Technology, 2008) reported that for bed temperatures lower than a critical value (< 850 )C), almost all the combustion takes place above the bed surface. In the present study, detailed unsteady 3D CFD simulations of such experiments have been performed using NEPTUNE_CFD code, which is based on an Euler-Euler approach to compute both gas and solid phases. Time-averaged quantities were computed and compared with the available experimental measurements. The numerical results (gas temperature and gaseous-species molar fractions in and above the bed) are found to be very sensitive to the mesh refinement in such reactive dense gas-particle flows.
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