Continuous segregation of homogeneous binary mixture of solids was experimentally investigated in a liquid fluidised bed with water as the fluidising medium. Experiments were conducted to study the influence of operating variables such as feed rate of solids, feed composition and liquid superficial velocity on pressure drop, entrainment and discharge rates of solids, and purity of top and bottom products. The fluidisation phenomenon was observed through pressure drop measurements and the liquid velocity range for the classification of solids was identified. Correlations are proposed for the entrainment rate of solids, and purity of top and bottom products. When solid particles are in a fluid-like state, there exists an equilibrium between released flotsam component and residual jetsam component at steady state. © 2019, © 2019 Indian Institute of Chemical Engineers.

P Sesha Talpa Sai

Department Of Chemical Engineering

Binary mixtures

Drops

Fluidization

Liquids

Pressure drop

Entrainment rates

HOMOGENEOUS BINARY MIXTURE

LIQUID SUPERFICIAL VELOCITIES

Liquid velocities

Operating variables

PRESSURE DROP MEASUREMENTS

Size segregation

VELOCITY RANGE

Fluidized beds

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IIT Madras

Continuous segregation of homogeneous binary mixture of solids by a liquid fluidised bed classifier

Indian Chemical Engineer

The effect of feed entry location on segregation of the binary mixture of solids in a continuous liquid fluidised bed has been investigated in the present study. Three different feed entry locations were selected and examined in a 72 mm ID and 3 m height continuous liquid fluidised bed. The binary feed mixture consists of different sized particles of same density with different compositions. The significant observations noticed at various feed entry locations on fluidisation behaviour are discussed. While feed entry location had a significant influence on purity and recovery of top and bottom products, it had no appreciable influence on pressure drop profile, entrainment and discharge rates of solids. The optimum liquid velocity and optimum purity/recovery were identified for every feed entry location for maximum separation of both the particles. © 2018, © 2018 Indian Institute of Chemical Engineers.

Continuous segregation of binary mixture of solids in liquid fluidised beds: influence of feed entry location

Studies on the influence of feed entry on segregation using continuous fast fluidization is not clearly understood even though studies are available on the segregation of particles in continuous bubbling/turbulent fluidized beds. In the present study, four different feed inlet positions are selected and tested in a 69 mm ID and 3.65 m height continuous fast fluidized bed. The feed is a binary mixture of solid particles of the same size, but different density. The inimitable observations noticed at various feed locations on fluidization behavior with segregation is discussed. Change in the feed inlet height of the fluidized bed is reflected drastically on the compositions of top and bottom products. Disparate behavior of continuous fluidization is noticed at selected feed inlet positions. Operation is not stable due to either particle congestion in the feeding line or nonuniform discharge of solids from the fluidized bed when the feed inlet position is located close to distributor. Further an enhanced-feed inlet location created a particles cloud above the dense phase. Excess of feed inlet height transformed the binary mixture severance and freeboard height. The optimum operating gas velocity required for maximum separation of both species is identified at every feed entry for different feed rates. A unique feed entry location is recognized for maximum separation of both the species and minimum gas. © 2011 American Chemical Society.

Industrial and Engineering Chemistry Research

Influence of feed entry on the segregation of a binary mixture of solids in a continuous fast fluidized bed

The segregation pattern of a binary mixture of particles is studied in a continuous fast-fluidized bed of 3.65 m height and 69 mm ID. The influence of operating variables such as gas velocity, solids feed rate and feed composition on total solids holdup and axial solids holdup is studied. Empirical correlations are proposed for the total pressure drop in the fast fluidization regime when density and/or size segregation occur. The influence of the operating variables on the axial concentration of solids in both the dense and dilute phases is analyzed. © 2010 Elsevier B.V. All rights reserved.

Chemical Engineering Journal

Studies on segregation of binary mixture of solids in a continuous fast-fluidized bed. Part IV. Total solids holdup, axial solids holdup and axial solids concentration

Segregation of binary mixture of solids was experimentally investigated in a continuous fast fluidized bed of 69 mm i.d. and 3.65 m high with air as the separation medium. The feed is a binary mixture of solid particles of same size, but different density. The variables include superficial gas velocity, solids feed rate and feed composition. It was observed that, at steady state, there exists physical equilibrium between the evolved flotsam and the residual jetsam when the granular solids are in fluid-like state. The phase diagram was constructed from the experimental observations. It shows the range for segregation, behavior of the fluidized bed and the distribution of the flotsam and jetsam, which can be understood by analogy with the distillation of the binary liquid mixture. The effect of the solids feed rate and feed composition on equilibrium distribution of the flotsam and jetsam was studied. © 2007 Elsevier B.V. All rights reserved.

Studies on segregation of binary mixture of solids in a continuous fast fluidized bed. Part I. Effect of particle density

Experimental investigations on the continuous fast fluidized bed were extended for size segregation of binary mixture of solids in the column with air as the separation medium [1]. The feed is either jetsam-rich or flotsam-rich binary mixture of particles of different size, but same density. The variables tested were superficial gas velocity, solids feed rate and feed characteristics. At steady state, there exists physical equilibrium between the evolved flotsam and the residual jetsam when the granular solids are in fluid-like state as in the case of density segregation of solids [1]. Using the analogy of the binary liquid mixtures separation by distillation, the phase diagram was constructed from the experimental observations. The effect of solids feed rate, feed composition, particle size ratio and particle size on equilibrium distribution of the flotsam and jetsam were presented. © 2007 Elsevier B.V. All rights reserved.

Journal	Data powered by TypesetIndian Chemical Engineer
Publisher	Data powered by TypesetTaylor and Francis Ltd.
ISSN	00194506
Open Access	No