Unsteady three-dimensional numerical simulations of methane combustion in dense fluidized bed

Ziad Hamidouche (1) , Enrica Masi (1) , Pascal Fede (1) , Olivier Simonin (1) , Renaud Ansart (2) , Mehrdji Hemati (2)

1 IMFT - Institut de mécanique des fluides de Toulouse
2 LGC - Laboratoire de Génie Chimique

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.

Mots clés: Reactive multiphase flows; Fluidized bed; Natural gas combustion

Domaines: Mécanique des fluides [physics.class-ph]

Ziad Hamidouche, Enrica Masi, Pascal Fede, Olivier Simonin, Renaud Ansart, et al.. Unsteady three-dimensional numerical simulations of methane combustion in dense fluidized bed. 9th International Conference on Multiphase Flow (ICMF 2016), May 2016, Firenze, Italy. pp. 1-6. ⟨hal-01706943⟩