Numerical Modelling Of A Bubbling Fluidized
Bed Combustor
Author(s)
S. Ravelli & A. Perdichizzi
Abstract
A numerical model of a bubbling fluidized bed combustor fed by refuse derived
fuel is presented. The combustor is divided into two regions: the bed and the
freeboard. The calculation of mass and energy fluxes entering from the bed into
the freeboard provides the boundary conditions for the subsequent CFD analysis.
The three-dimensional freeboard model, implemented by means of the
commercial code FLUENT 6.1, is mainly concerned with employing the twomixture-
fraction-pdf approach to track both the flue gas coming from the bed and
the solid fuel particles that do not burn in the bed, but above it. The excess air is
injected through four series of nozzles; the heat exchange between the
combustion gases and the boiler tubes is also taken into account in the model.
The comparison between the predicted and the experimental data shows a good
agreement about chemical species concentrations, velocity and temperature
profiles along the freeboard height. The reliability of the simulation results
proves that CFD modelling is a valid instrument to analyse the behaviour of non
conventional furnaces.
Keywords: CFD modelling, fluidized bed combustion, freeboard, refuse derived
fuel.
1 Introduction
The fluidized bed combustor (FBC) is a flexible and reliable technology that
carries out combustion at lower operating temperatures (700-950°C) in
comparison with conventional boilers. So, it’s possible to reduce considerably
the pollutants emitted with the flue gas; besides, limestone or dolomite can be
brought into the bed to adsorb sulphur and halogen compounds. Carbon
monoxide and unburned hydrocarbon discharged in atmosphere are very low
Keywords
CFD modelling, fluidized bed combustion, freeboard, refuse derived
fuel.
Related Book
Other papers in this volume
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