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3D Numerical simulation of natural gas combustion in a fluidized bed reactor

Hamidouche, Ziad and Masi, Enrica and Fede, Pascal and Simonin, Olivier and Ansart, Renaud and Dounit, Salah and Hemati, Mehrdji 3D Numerical simulation of natural gas combustion in a fluidized bed reactor. (2015) In: 22nd FBC (22nd International Conference on Fluidized Bed Conversion), 14 June 2015 - 19 June 2015 (Turku, Finland). (Unpublished)

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Abstract

This study presents detailed 3D unsteady CFD simulations, performed using NEPTUNE_CFD V1.08@Tlse code, of air-methane combustion in a dense fluidized bed containing inert particles. Predictions are compared with the experimental data reported in Dounit et al. (2001a, 2001b, 2008). In their study, the authors investigated the behavior of natural gas combustion process in dense fluidized bed and in the freeboard at temperatures lower than a critical value (< 850°C). The main outputs of the experiments are vertical profiles of gaseous-species concentrations and gas temperature. In CFD simulations, an Euler-Euler approach is used to compute separately gas and solid phases flows (primary variables for each phase are volume fraction, velocity, enthalpy, mass fraction), with detailed closure models to account for fluid-particle and particle-particle mass, momentum and energy transfers. Gaseous combustion is modeled by a two-step mechanism following Arrhenius-type equations (Dryer & Glassman, 1973, Westbrook and Dryer, 1981). The Eulerian modeling takes into account the energy exchange by radiation between the gas, the particles and the reactor walls as well. The 3D unsteady simulations are analyzed to characterize dynamic flow behavior, thermal spatial distribution and interphase equilibrium. Time-averaged quantities are computed to compare predictions with the available experimental measurements.

Item Type:Conference or Workshop Item (Paper)
HAL Id:hal-01696336
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
Funders:
European Community
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Deposited By: Olivier SIMONIN
Deposited On:30 Jan 2018 10:22

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