Abstract

ROGEL-RAMIREZ, A.. CFD Modelling of an Open Core Downdraft Moving Bed Biomass Gasifier. Ing. invest. y tecnol. [online]. 2008, vol.9, n.4, pp.329-338. ISSN 2594-0732.

This paper contains the description of a bidimensional Computacional Fluid Dynamics (CFD), model developed to simulate the flow and reaction in a stratified downdraft biomass gasifier, whereby Eulerian conservation equations are solved for particle and gas phase components, velocities and specific enthalpies. The model is based on the PHOENICS package and represents a tool which can be used in gasifier analysis and design. Contributions of chemical kinetic and the mixing rate using the EBU approach are considered in the gas phase global homogeneous reactions. The harmonic blending of chemical kinetics and mass transfer effects, determine the global heterogeneous reactions between char and O₂, CO2, and H₂O. The turbulence effect in the gas phase is accounted by the standard k-s approach. The model provides information of the producer gas composition, velocities and temperature at the outlet, and allows different operating parameters and feed properties to be changed. Finally, a comparison with experimental data available in literature was done, which showed satisfactory agreement from a qualitative point of view, though further validation is required.

Keywords : CFD modeling; Biomass Gasification; Stratified Downdraft Gasifier; Eddy Brake Up Model.

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