HYDRODYNAMIC STUDY OF SOLID LIQUID FLUIDIZATION
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Transcript of HYDRODYNAMIC STUDY OF SOLID LIQUID FLUIDIZATION
HYDRODYNAMICS OF SOLID-LIQUID
FLUIDIZED BED
PRESENTED BY KALYANI NAHAK
PRATIKSHYA RATHSAMBIT PRAKASH OJHA
GANESH SWAINANTARJAMEE SAHU
OUTLINES/CONTENTS INTRODUCTIONTYPES OF FLUIDIZATIONVARIBLES AFFECTING FLUIDIZATIONEXPERIMENTAL PROCEDURERESULTSDISCUSSIONSCONCLUSIONREFERENCE
INTRODUCTION
Solid-fluid contacting technique.It starts when force due to fluid equals with weight of bed.Greater ability to mix and segregate.Extremely acclaimed in the process industry.
TYPES OF FLUIDIZATIONMainly 2 types of fluidization are there.
Particulate fluidizationAggregative fluidization
PARTICULATE
FLUIDIZATION
Occurs at low velocity.Bed maintains its uniform character.Froude number less than unity.
AGGREGATIVE
FLUIDIZATION
Occurs at high velocity.Two phase i.e. emulsion phase and lean phase form.Froude number greater than unity.Also known as bubbling fluidization.
VARIABLES AFFECTING FLUIDIZATION
Quantity of solid feed.Liquid viscosity.Fluid distribution.Bed height.Particle size.Fluid and solid densities.Column diameter.Bed internals.
EXPERIMENTAL PROCEDURE
A weight amount of beads were taken.Water flow rate increase by control of
rotameterPressure drop ,bed height, void fraction
were measured.1kg salt added to the water.Fluidization started for new solution.Then,4 more new solutions prepared.For each solution pressure drop, bed
height , void fraction ,bed expansion ratio were measured.
RESULTSFollowing graphs were plotted:1. Flow rate vs. pressure drop across the bed2. Flow rate vs. pressure drop across the
distributor plate3. Flow rate vs. void fraction4. Flow rate vs. bed height5. Flow rate vs. bed expansion ratio
1.FLOW RATE VS PRESSURE DROP ACROSS THE BED
SI NO.
FLOW RATE
Pressure drop across the bed(N/M2
Pressure drop across the bed(N/M2)
Pressure drop across the bed(N/M2)
Pressure drop across the bed(N/M2)
Pressure drop across the bed(N/M2)
Pressure drop across the bed(N/M2)
LPH WATER
1037.3kg/m^3 sol.
1041.4kg/m^3 sol.
1041.7kg/m^3 sol.
1047.4kg/m^3 sol.
1058.2kg/m^3 sol.
1 0 0 0 0 0 0 02 25 494.42 492.96 492.8 369.59 369.42 246.073 50 1854.1 1848.6 1848.0 1724.8 1477.7 1476.44 75 2595.7 2834.5 2587.2 2710.3 2832.2 2460.75 100 3831.8 3820.4 3942.4 3447.5 3694.2 3568.06 125 5438.7 5422.6 5297.6 4558.3 4433.1 4429.37 150 7169.1 7024.7 7884.8 6036.6 5541.3 5413.58 175 8528.8 8380.3 9116.8 6775.8 6649.6 6890.09 200 9146.8 9119.8 9116.8 8254.2 7634.7 8366.410 225 9146.8 9119.8 9116.8 9116.6 9112.4 9104.611 275 9146.8 9119.8 9116.6 9112.4 9104.612 300 9119.8 9116.6 9112.4 9104.613 325 9119.814 350 9119.8
1.FLOW RATE VS PRESSURE DROP ACROSS THE BED
2.FLOW RATE VS PRESSURE DROP ACROSS THE
DISTRIBUTOR PLATE
2.FLOW RATE VS VOID FRACTIONSI. NO
FLOW RATE
VOID FRACTION
VOID FRACTION
VOID FRACTION
VOID FRACTION
VOID FRACTION
VOID FRACTION
LPH WATER
1037.3kg/m^3 sol
1041.4kg/m^3
1041.7kg/m^3 sol.
1047.4 kg/m^3 sol.
1058.2kg/m^3 sol.
1 0 0.391 0.391 0.391 0.391 0.391 0.3912 25 0.391 0.391 0.391 0.391 0.391 0.3913 50 0.391 0.391 0.391 0.391 0.391 0.3914 75 0.391 0.391 0.391 0.391 0.391 0.3915 100 0.391 0.391 0.391 0.391 0.391 0.3916 125 0.391 0.391 0.634 0.391 0.391 0.3917 150 0.391 0.391 0.652 0.391 0.391 0.3918 175 0.391 0.437 0.652 0.391 0.415 0.4789 200 0.391 0.582 0.652 0.391 0.543 0.51310 225 0.543 0.605 0.707 0.528 0.582 0.58211 275 0.570 0.722 0.582 0.643 0.61512 300 0.734 0.615 0.734 0.64313 325 0.805 0.6614 350 0.819
2.FLOW RATE VS VOID FRACTION
2.FLOW RATE VS AVERAGE BED HEIGHTSI. NO
FLOW RATE
BED HEIGHT(cm)
BED HEIGHT(cm)
BED HEIGHT(cm)
BED HEIGHT(cm)
BED HEIGHT(cm)
BED HEIGHT(cm)
LPH WATER
1037.3kg/m^3 sol
1041.4kg/m^3 sol.
1041.7kg/m^3 sol
1047.4kg/m^3 sol
1058.2kg/m^3 sol
1 0 2.4 2.4 2.4 2.4 2.4 2.42 25 2.4 2.4 2.4 2.4 2.4 2.43 50 2.4 2.4 2.4 2.4 2.4 2.44 75 2.4 2.4 2.4 2.4 2.4 2.45 100 2.4 2.4 2.4 2.4 2.4 2.46 125 2.4 2.4 3.2 2.4 2.4 2.47 150 2.4 2.4 4.4 2.4 2.4 2.48 175 2.4 2.6 4.8 2.4 2.5 2.89 200 3.2 3.5 5.2 2.4 3.2 3.010 225 3.4 3.7 5.9 3.1 3.5 3.511 275 5.25 3,5 4.1 3.812 300 5.5 3.8 5.5 4.113 325 7.5 4.314 350 8.1
2.FLOW RATE VS AVERAGE BED HEIGHT
2.FLOW RATE VS AVERAGE BED
EXPANSION RATIO
DISCUSSIONPressure drop decreases with density, ΔΡ/L=g(1-ɛ)(ρp-ρ).Void fraction increases with density , ɛ= 1-(δρ/Lg(ρp-ρ).Bed height and bed expansion ratio also
increase with density.
CONCLUSION It scopes ample opportunity for future study.Beads of different shape, density can be
implemented.
REFERENCE Escudiea R., Epsteina N., Gracea J.R., H.T. Bi. Effect of particle shape on liquid-fluidized
beds of binary (and ternary) solids mixtures: segregation vs. mixing, Journal of Chemical Engineering Science 61, 1528 – 1539,(2006)
.K.Mukherjee, B.K.Mishra, Experimental and simulation studies on the role of fluid velocity during particle separation in a liquid–solid fluidized bed, Int. J. Miner. Process. 82, 211–221,(2007)
Formisani B., Girimontey R., Longoz T., The Fluidization Pattern of Density-Segregating Two-Solid Beds, ECI Conference on The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering(2007)
P Natarajan, R Velraj, R.V.Seeniraj, Effect of various parameters on the solid circulation rate in a liquid–solid circulating fluidized bed, Asia Pacific Of Chemical Engineering,vol-3,459-470,(2008)
D.C.Sau, S.Mohanty , K.C.Biswal, Bed Fluctuation Ratio for Regular and Irregular Particles in Gas-Solid Tapered Fluidised Beds, Indian Chemical Engineer,51,117-128,(2010)
Shrivastava, Pooja V Soni, A. B. kumar, Hydrodynamic studies of three-phase semi-fluidized beds with irregular particles, Indian Journal Of Chemical Technology,0975-0991 ,(2013)
Achankunju AT, Sivalingam A, Kannadasan T (2013) Experimental Studies on Hydrodynamics Characteristics of Co-current Three Phase Fluidization Using Different Sizes of Glass Beads and its Prediction by Fuzzy Logic , (2013)