Experimental Study of the Mixing and Segregation Behavior in Binary Particle Fluidized Bed with Wide Size Distributions
-
Runjia Liu
und
Rui Xiao
Abstract
Detailed understanding the particle mixing and segregation dynamic is essential in successfully designing and reasonably operating multicomponent fluidized bed. In this work, a novel fluorescent tracer technique combining image processing method has been used to investigate the mixing and segregation behavior in a binary fluidized bed with wide size distributions. The particle number percentage in each layer for different gas velocities is obtained by an image processing method. Fluidization, mixing and segregation behavior has been discussed in terms of bed pressure drop, gas velocity and mixing index. Different types of binary particle systems, including the jetsam and the flotsam-rich system, are analyzed and compared. The mixing indexes at different minimum fluidization velocities are also analyzed and compared with other work. The results show that the theoretical minimum fluidization velocity calculated from the bed pressure drop cannot represent the whole fluidization for a wide size distribution binary particle system. The effect of a wide size distribution is an inflection point in the mixing index curve. There is also a dead region in the bottom of the bed that consists of particles with large size and a low degree of sphericity. The particles in the dead region are extraordinarily difficult to fluidize and should be considered in the design of fluidized beds in industrial applications.
Acknowledgements
The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (Grant No. 51525601).
Nomenclature
Concentration of the tracer particles
The average of
Lacey mixing index
Rowe mixing index
- d
particle diameter, m
number of the tracer particles in each layer
total number of the tracer particles
theoretic minimum fluidization velocity, L/min
minimum fluidization velocity for Jetsam, L/min
minimum fluidization velocity for Flotsam, L/min
- VSi
Volume of silica sand, m3
- VAl
Volume of Alumina particle, m3
variance of the concentration for the random mixture
variance of the concentration for the fully segregated mixture
variance of the concentration for the perfectly mixed mixture
density, kg/m3
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Artikel in diesem Heft
- review
- Application of Microfluidics in Process Intensification
- article
- A Versatile Converter of Liquid Hydrocarbons for the Production of Reducing and Carbonization Atmospheres
- Design of Impeller Blades for Intensification of Gas-Liquid Dispersion Process in a Stirred Tank
- Experimental Study of the Mixing and Segregation Behavior in Binary Particle Fluidized Bed with Wide Size Distributions
- Studies of Dehydrogenation Reaction over Zinc-Alumina Catalyst
- Pressure-Leaching Behavior of Nickel from Ni–Mo Ore in Aqueous Oxygenated Media
- Impact of Chemical Reaction on MHD 3D Flow of a Nanofluid Containing Gyrotactic Microorganism in the Presence of Uniform Heat Source/Sink
- Impact of Dense Internals on Fluid Dynamic Parameters in Bubble Column
- Improvement of Quality and Digestibility of Moringa Oleifera Leaves Feed via Solid-State Fermentation by Aspergillus Niger
- Adsorption of Hexavalent Chromium by Eucalyptus camaldulensis bark/maghemite Nano Composite
