hbo starch prosp e 05

8/6/2019 HBO Starch Prosp e 05

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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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+

-

-

-

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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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

LaboratoryEquipment

FILTRATESTDYNOTEST

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Filtration

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Pan Filter Backflush Filter

DYNO Filter ( sieve)

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

[email protected]

BOKELA Australia Pty

Building 5 Spring Lake Commercial1 Springfield Lakes Blvd

Springfield Lakes, QLD 4300Australia

phone : +61 7 3288 1400fax: +61 7 3288 1424

[email protected]

BOKELA GmbH

Tullastr. 6476131 Karlsruhe

Deutschland

Tel.: +49 721 96456-0Fax: +49 721 96456-10

[email protected]

hbo starch prosp e 05

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