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COBEM 2021
26th International Congress of Mechanical Engineering
EULERIAN-EULERIAN CFD SIMULATION OF BIOMASS DEVOLATILIZATION IN FLUIDIZED BED REACTOR FOR GASIFICATION
Submission Author:
Vitor Alberto Lemes Monteiro , MG , Brazil
Co-Authors:
Vitor Alberto Lemes Monteiro, Maurício Guilherme Alves dos Reis, Luciano Infiesta, Solidônio Carvalho
Presenter: Vitor Alberto Lemes Monteiro
doi://10.26678/ABCM.COBEM2021.COB2021-0173
Abstract
The present work is related to a municipal refuse-derived fuel gasification system of a semi-industrial fluidized bed reactor. Computational fluid dynamic modeling was implemented using the opensource software OpenFOAM to simulate the biomass devolatilization of pyrolysis process in fluidized bed system.The objective of this work was to develop a model to simulate a simplified 2D reactor able to provide consistent results of the biomass chemical processes of gasification. For this paper, the focus was the devolatilization reaction due to its complexity related to biomass conversion into solid and gaseous phases. Therefore, it was not possible to compare quantitatively the produced syngas composition with literature, since the heterogeneous and homogeneous reactions were not implemented yet. The Eulerian Eulerian approach was employed to handle a three-phase system composed by silica sand and biomass particles into an air medium. The most advantage of such approach is the lower computational requirements when simulating dense particle reacting system. Reynolds-Averaged Navier-Stokes was used with k-ε turbulent modeling. The Ranz Marshal heat exchange model of between phases, Gidaspow drag model and Kinetic Theory of Granular Flows was implemented to the balance equations. Mass and energy source terms was attached to mass, species and momentum balance equations to represent the chemical process of the devolatilization. The biomass consumption and conversion from the solid phase to gaseous products was modeled through Arrhenius law of devolatilization rate. Experimental data of pine wood biomass pyrolysis was used in this occasion to the simulation model. All thermophysical properties was acquired by Sutherland’s Law and JANAF Thermochemical Tables. The results shows qualitatively consistent progression of devolatilization process in terms of biomass solid phase transformations into char and syngas. To reach the semi industrial scale simulation modeling, further work consists of (i) implement the remaining heterogeneous reactions of carbon conversion and gasification homogeneous reactions, (ii) add the limestone reacting solid phase and (iii) expand the reactor mesh domain to the real dimensions project.
Keywords
pyrolysis, Municipal solid waste, municipal refuse-derived fuel, dense flow, multiphase flow
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