Transcript
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Dewatering of Starch Suspensionsby Continuous Pressure Filtration
Starch Dewateringby Hi-Bar Filtration
1 / 2 0 1 0 e
0,5 100
1
2
3
p ce
P r e s s u r e
d i f f e r e n c e
p
S r
Saturation S
t2 = OO t2 = 30 s t 2 = 0 st2 = 60 s
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BOKELA Hi-Bar Oyster Filter Continuous Pressure Filtration
The Oyster Filter is made for applications with:
valuable products
fine and difficult to filter particles
toxic products
low-boiling suspensions frequent product changing
high quality standards
extreme process conditions
especially designed for thechemical, pharmaceutical, foodand life science industry.
The Oyster Filter a continuous pressure filter
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Basics The Product
A-StarchGlobules
B-StarchGlobules
Wheat Starch
Particle Size Distribution of Wheat Starch (schematic)
0
5
10
15
20
25
30
35
0 5 10 15 20 25 30 35 40 45 50 55
Particle Diameter ( m)
V o
l u m e
%
B-Starch A-Starch
x50 (B-Starch)x50 (A-Starch)
The smaller the particles,the more difficult thesolid liquid separation
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Basics The Process
ThermalDryer
A-StarchSuspension
MechanicalDewatering
NativeA-Starch
Horizontal Peeler Centrifuges
Vacuum Filters
Vertical Belt Presses(Automatic Pressure Filters)
Hi-Bar-Filters(hyperbaric Filters)
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Basics The Objectives
Mechanical Dewatering
Good Dewatering (low residual moisture content)
Energy saving in the succeeding dryer
Investment saving for new plants (smaller thermal dryer
Capacity improvement for existing plants
High Starch Throughput
Small apparatus sizes
Continuous Operation
Investment saving for peripheral equipment (smaller storage tanks etc.)
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Basics The Equipment
continuous
dis-continuous
continuous
dis-continuous
Operation
up to24 m
up to144 m
up to100 m
up to1800 mmdiameter
Size
p up to6 bar
p up to6 bar
p up to 0.7bar
800 xg-force
(& p up to 0.9bar)
Drivingforce
600 800kg/m/h34-36%Hi-Bar Filter
50-150kg/m/h34-36%
Vertical BeltPress
100-200kg/m/h40-42%Vacuum Filter
400-500kg/m/h
38-40%(37-38%)
HorizontalPeeler Centrifuge
Dewatering ThroughputEquipment
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Basics The Equipment
+
-
-
-
Invest cost for periphery
0
-
+
- -
Invest cost for Equipment
+Hi-Bar Filter
+Vertical Belt Press
- -Vacuum Filter
-Horizontal Peeler Centrifuge
Energy cost /Invest cost for thermal dryer
Equipment
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Basics The Equipment
Residual moisture lowHigh throughput
Continuous operationGood accessibilityCIPFiltration of modifiedstarches possible
Residual moisture lowHigh throughputFiltration of modifiedstarches possible
Good accessibilityContinuous operation
Good flexibility to changingproducts
Advantages
Only two operational unitsinstalled (but workingsuccessfully)Hi-Bar Filter
Discontinuous operationDifficult belt alignmentCIP only limitedAccessibility limited
Vertical Belt Press
Residual moisture highLarge units required
Vacuum Filter
Residual moisture high
Discontinuous operationCIP only limitedThroughput limited
Horizontal Peeler Centrifuge
DisadvantagesEquipment
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Why Pressure Filtration:Low Residual Moisture Content
0,5 1
mechanical demoisturing limit(S R = remaining Saturation)
00
1
2
3
p ce p r e s s u r e
d i f f e r e n c e
p
S r reduced moisture contents
(overcoming of capillaryforces)
S = f [ ( p p ce ), t 2, ...]
capillaryentry pressure
p < P cep < 0,8 bar
Saturation S
t2 = 0 st2 = 60 st2 = OO
p1
p2
p1
p2
p1
p2filter cloth
t2 = 30 s
p = 2 bar
p = p 1 p 2
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mc = 41 %
mc = 35 %
Vacuum
Filtration
Hi-Bar
Filtration
filter cake:dry (powder like)
filter cake:wet and sticky
Why Pressure Filtration:Low Residual Moisture Content
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Why Pressure Filtration:High Solids Throughput
( ) 600,3A36060
np
r 2
1AmM F01
cLsFss
.
&
m s [kg/ms] specific solids throughput L [kg/ms] filtrate viscosity [-] solids concentration coefficientr C [1/m] cake resistance [-] porositiy
productparameters
n [1/min] filter speedp [N/m] pressure difference in form zone
processparameters
1 [] cake forming angle
[m] filter area
machine
parameters
processparameters
productparameters
machineparameters
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BOKELA Hi-Bar FiltrationProcess and Plant Design
Filter cake
Filtrate,condensate and air
Compressedair
Feed
Wash water
steam (p Dampf )
p Filtration
=P 1 - P ATM 6 bar
P Dampf = P 1P 1 : vessel pressure
P 2 : at cake discharge
P 2 > P 1
OYSTER-Design (smaller units)with vertical pressure vessel for sophisticated applications (chemical,pharmaceutical and food industry)
Standard design (large units)with horizontal pressure vesselfor bulk materials
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BOKELA Hi-Bar Oyster Filter Disc and Drum Filter
Oyster Drum Filter
Filter area 1.0 8.8 mFilter area 624 m
Oyster Disc Filter
filter
pressure vessel
sluice
Maincomponents
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BOKELA Hi-Bar Oyster Filter Excellent Accessibility - Easy Maintenance
excellent accessibility for maintenancework by completely hinged pressurevessel no "release of vessel"inspection required
Pressure Vessel
Vertical pressure vessel for optimum accessibility
Opens and closesautomatically
MOC: stainless steelpossible
Hydraulical locking device (Scholz)
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BOKELA Hi-Bar Oyster Filter Discharge Sluice
Sluice with proven and wellestablished valvesConical intermediate chamber to avoid bulk bridgingMOC: Stainless steelHeating of intermediatechamber possible
CIP
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BOKELA Hi-Bar Oyster Filter Sizing
* No single cell design
4
3
2
1
discs
3.5 x 3.5 m8.8 m1.9 mM9*
2.8 x 2.8 m5.0 m1.4 mS5
2.2 x 2.4 m2.0 m0.9 mXS2
3.5 x 3.5 m6.0 m2.2 mXS1
floor spacefiltration areadiameter type
24.0 m
18.0 m
12.0 m
6.8 m
3.6 m
1.0 m
filtration area
3.5 x 3.5 m2.2 mXS4
3.5 x 3.5 m2.2 mXS3
3.5 x 3.5 m2.2 mXS2
type
M7
S4
XS1
3.5 x 3.5 m1.9 m
2.8 x 2.8 m1.4 m
2.2 x 2.4 m0.9 m
floor spacediameter
D r u m
F i l t e r s
D i s c
F i l t e r s
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BOKELA Hi-Bar FiltrationPerformance Data
Oyster disc
XS315.61.0 3.034.76903806
modified A-
Starch
Oyster discXS1 or Oyster
drum M7
5.30.5 3.034.819808006Native A-Starch
Oyster discXS26.80.5 3.035.815506504
Native A-Starch
[bar]
p
[-][m][rpm][Weight
%][kg/m/h]
max[kg/m/h]
min
Filter type
Filter area for 200 to/d
Filter speed
CakemoistureSpecific troughputDuty
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BOKELA Hi-Bar FiltrationPerformance Diagram
0
200
400
0,0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,8 2,0
Square Root of Filter Speed [rpm 0.5 ]
min.0.5 rpm
max.3.0 rpm
standard1.5 rpm
800
1000
1200
1400
1600
1800
2000
2200
2400
D r y
S o
l i d s
T h r o u g
h p u
t [ k g
/ m / h ]
Range of Operation6.0 bar
4.0 bar
Product:native A-Starch
600
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BOKELA Hi-Bar Oyster Filter In Brief
Low residual moisture
High specific throughput
Continuous filtration process with disc- or drum filters,installed inside a pressure vessel
High filtration pressure difference of up to p = 6 bar
Complete cake discharge by air-blow-back with snap-blow valve(blow-off air serves for the filtration process)
Enclosed system
Good accessibility
Simple maintenance
Simple and quick filter cloth change due to filter segments / cells
High flexibility at fluctuating product properties by- Variable cake formation angle (adaptation during operation)- Variable cake thickness from 5 to 50 mm- different pressures in single process zones possible
Available in a wide range of filtration area and throughput
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www.bokela.com
Hi-Bar Filter
Drum Filter
Disc Filter
DYNO Filter (MF )
BackflushFiltration
VacuumFiltration
PressureFiltration
Hi-Bar Pressure &Steam Pressure
Filtration
Filter Revamping
FILTRATEST
ServicesFilter RevampingTrouble Shooting
ConsultingDevelopment
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Hi-Bar Oyster Filter
BOKELA do Brasil Ltda
R. Santiago Ballesteros 610Sala 6, Cinco
32010-050 Contagem MGBrazil
phone: +55 31 2565 0976fax: +55 31 2565 3976
bokeladobrasil@bokela.com
BOKELA Australia Pty
Building 5 Spring Lake Commercial1 Springfield Lakes Blvd
Springfield Lakes, QLD 4300Australia
phone : +61 7 3288 1400fax: +61 7 3288 1424
bokelaofaustralia@bokela.com
BOKELA GmbH
Tullastr. 6476131 Karlsruhe
Deutschland
Tel.: +49 721 96456-0Fax: +49 721 96456-10
bokela@bokela.com
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