Hydrodynamics Modeling of an LSCFB Reactor Using Multigene Genetic Programming Approach: Effect of Particles Size and Shape
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Shaikh A. Razzak
Abstract
The multigene genetic programming (MGGP) technique based hydrodynamics models were developed to predict the solids holdups of a liquid-solid circulating fluidized bed (LSCFB) riser. Four different particles were considered to investigate the effects of particle size, shape and density on hydrodynamics behavior of the LSCFB riser. In this regard, two spherical shape glass bead particles (500 and 1200 μm), two irregular shape lava rock particles (500 and 920 μm) were employed as solid phase and water as liquid phase. The MGGP models were developed, relating the solids holdup (
Acknowledgements
The author would like to acknowledge the support provided by King Abdulaziz City for Science and Technology (KACST) through the Science & Technology Unit at King Fahd University of Petroleum & Minerals (KFUPM) for funding of this work, project No. NSTIP # 13-WAT96-04, as part of the National Science, Technology and Innovation Plan.
Nomenclature
Archimedes number
Cross-sectional area of riser (m2)
Cross-sectional area of downer (m2)
Drag coefficient
Particle diameter (m)
Dimensionless particle diameter
Solid circulation rate (kg/m2.s)
Height of the riser (m)
Height of accumulated particles (m)
Weights obtained through training the network
Radial position (m)
Radius of the riser (m)
Reynolds number at terminal settling velocity
Time (s)
Auxiliary liquid velocity (cm/s)
Superficial liquid velocity (cm/s)
Primary liquid velocity (cm/s)
Superficial solid velocity (cm/s)
Terminal settling velocity (cm/s)
Normalized liquid velocity
Net superficial liquid velocity (cm/s)
Dimensionless terminal settling velocity (cm/s)
Greek Letters
Density of solid particle (kg/m3)
Density of liquid (kg/m3)
Solids holdups
Liquid holdups
Sphericity
Local conductivity
Estimated local conductivity
- σ1
Local conductivity when the pipe is full of single liquid phase
Local conductivity when the pipe is full of solid phases
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