Minimum Fluidization Velocity of Intermediate Sized Particles in Conventional and Packed Fluidized Bed
-
Niraj J. Kulkarni
and
Vishwanath H. Dalvi
Abstract
Typical Geldart B class particles are often used in a gas-solid fluidized bed for various industrial applications. The quality of fluidization of Geldart B particles depends upon the geometry of the bed containing vessel, properties of fluidization medium and the gas flow rate. The presence of large bubbles/slugs that can happen in beds with intermediate class particles is undesirable. The bubbling and slugging, which decrease the quality of fluidization can be prevented with the phenomenon called packed fluidization. Experiments were carried out on the conventional fluidized bed and packed fluidized bed to investigate some of the hydrodynamic characteristics as a function of bed temperature, small particle size, fluidization medium and fraction of voids of packing filled with small particles. The superficial gas velocity required for packed fluidization reduces significantly than conventional fluidization. The minimum fluidization velocity of particles increases with an increase in density of the fluidization gas and decreases with increase in temperature of the bed. A correlation established from experimental data fairly predicts the minimum fluidization velocity for the packed fluidized bed.
List of Symbols
Minimum fluidization velocity (ms−1)
Pressure drop across the bed (Nm−2)
Superficial helium velocity (ms−1)
Minimum fluidization velocity for packed fluidized bed (ms−1)
- dp
Particle diameter of small particles (m)
A fraction of interstitial void volume of pebble bed filled by the small particles
void fraction of unary packing pebble bed of large particles
Minimum fluidization velocity for Conventional fluidized bed (ms−1)
Viscosity of Helium gas (kg m−1 s−1)
Density of Helium gas (kg m−3)
- Tw
Bed Wall temperature (K)
- Ta
Ambient Temperature (K)
Acknowledgements
The authors are thankful to Board of Research in Nuclear Sciences (BRNS) for providing funding to carry out this work. The authors are also thankful to Shri B.K. Chougule for his constant supervision in the experimental studies and the authors are also thankful to Shri S. R. Satre, Shri C.A. Shinde and Shri Santosh Sarang for their assistance in the experimental studies.
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Articles in the same Issue
- Articles
- Numerical Simulation of Flow Characteristics in an Inclining Rotating Kiln with Continuous Feeding
- Minimum Fluidization Velocity of Intermediate Sized Particles in Conventional and Packed Fluidized Bed
- Multicycle Study on Chemical Looping Combustion with a CaSO4-CaO Mixed Oxygen Carrier
- Economic Optimization of Rare Earth Element Leaching Kinetics from Phosphogypsum with Sulfuric Acid
- Heat Transfer Characteristics of Nitrogen in Supercritical Region Using Redlich-Kwong Equation of State
- Chattering Free Sliding Mode Control with Observer Based Adaptive Radial Basis Function Neural Network for Temperature Tracking in a Fixed Bed Reactor
- Role of Support in Hydrocracking of n-hexadecane over Sulfided NiMo Catalysts
- Leaching of Indium from Indium-and Iron-Bearing Sphalerite Concentrate in Sulfuric Acid–Ferric Sulfate Solution
- Electrochemical Behavior of Fe3O4 in NaCl-CaCl2 Melts
- Effect of the Impurity Ions on the Crystallization of Urea Phosphate
