An Advanced Gas–solid Flow Engineering Model
For A Fluidized Bed Reactor System
Author(s)
D. Mao & M. Tirtowidjojo
Abstract
A literature survey shows that there are two approaches to mathematically
describe gas–solid two-phase flow and reaction in the fluidized bed reactors. One
approach is a very simplistic engineering reactor model, and the other approach
is based on a rigorous Computational Fluid Dynamic (CFD) model. Despite
significant progress on numerical methods, CPU capacity and performance, and
theories describing gas–solid flow, CFD based reacting flow modeling is far
from being a routine tool for designing new reactors. Thus, simpler reactor
models are still the main method for providing guidance for fluidized bed reactor
design and optimization. However, traditional reactor models have considered
too many simplifying assumptions that create inconsistencies in the governing
equations of the boundary conditions such that it can result in erroneous
prediction. In the current paper, an advanced gas–solid two-phase engineering
reactor model has been developed for flow, heat transfer and reaction in the riser
reactor of a circulating fluidized bed system. In contrast to CFD, this model can
use as input parameters the hydrodynamic information obtained from published
literature or experimental measurement such as axial and radial profiles for solid
volume fraction, gas velocity and gas dispersion coefficient. While the
hydrodynamics can be as accurate as measured, this advanced engineering
reactor model is also coupled with either simple power law or the most rigorous
kinetic models that involve elementary reactions. In this way, we can extract
heterogeneous reaction kinetics from pilot plant or production reactor data
directly. Model validation with pilot plant data and tracer data for a riser reactor
will be presented and the short falls of traditional treatment of engineering
fluidized bed reactor models will also be discussed.
Keywords: fluidized bed, gas–solid two-phase flow, reaction, CFD.
Keywords
fluidized bed, gas–solid two-phase flow, reaction, CFD.
Related Book
Other papers in this volume
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