Validation Of The CFD Model For Prediction Of
Flow Behaviour In Fluidized Bed Reactors
Author(s)
R. K. Thapa & B. M. Halvorsen
Abstract
The aim of this study is to develop a robust CFD model for predicting fluid
dynamics in a gasification reactor. Experimental tests are performed. A
cylindrical bed with pressure sensors is used in the experimental study. A series
of simulations are performed using the commercial CFD tool ANSYS Fluent
12.1. A multi-fluid Eulerian model incorporating the kinetic theory of granular
flow is applied in the simulations. Fluidized bed reactors in biomass gasification
processes use steam as a fluidizing gas. High temperature makes it difficult to
study the flow behaviour under the operating conditions. A cold flow model is
constructed to study the fluid dynamics. Air at ambient conditions is used as the
fluidizing gas for the cold model. The density and viscosity variation between air
at ambient temperature and steam at high temperature results in different flow
behaviour. The CFD model is developed to also be able to predict the flow
behaviour of steam fluidized beds. Computational minimum fluidization
velocity, bed expansion ratio pressure drop and pressure standard deviation agree
well with experimental measurements. A computational model has been
developed and validated against experimental data. The validated CFD-model
can be useful in the study of flow behaviour of high temperature steam fluidized
gasification reactors.
Keywords: fluidized bed, CFD, multi-fluid Eulerian model.
1 Introduction
Gas-solid fluidized bed reactors are widely used in biomass gasification
technology. The fluidizing gas in the reactors is steam at high temperature. Study
of the flow behaviour inside the hot bed is difficult. Most of the design and
Keywords
fluidized bed, CFD, multi-fluid Eulerian model.
Related Book
Other papers in this volume
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