Vacuum Filters En

7/30/2019 Vacuum Filters En

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Vacuum lters


http://slidepdf.com/reader/full/vacuum-filters-en 2/82 Vacuum lters

the cake rises above the slurrylevel in the lter tank and air is

drawn through the cake, orcingout liquid.

The liquid (ltrate) exits the lterthrough the internal piping andthe vacuum head.

Vacuum ltration is a well estab-lished technique used in industri-

al dewatering. Metso has success-ully delivered and installed manyhundreds o rotary vacuum lterscovering a wide eld o applica-tions.

All rotary vacuum lters operateon a similar principle.

A pressure dierential betweenthe surace and inside o the

drum (or disc) is applied bymeans o vacuum. This pressuredierential causes transport o liquid through the ltration sur-ace while the lter mediumarrests solid particles and a cakeis ormed. As the drum rotates,

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1. Top Feed Drum Filter 2. Drum Filter 3. Disc Filter 4. Belt Drum Filter

Vacuum lters

The range o rotary vacuum lters incorporates two basic designprinciples:

Comparison o suitable equipment or dierent particle size distributionand residual moisture.

Pressure dierential causes transport o liquid through the ltra-tion surace while the lter medium arrests solid particles and a

cake is ormed.

giam

High vacuum air lowrates

The Metso lters are specially designed or

high vacuum operation allowing very high

air fowrates.

This results in:

– Higher capacities

– Lower cake moisture

– Extended application range

Integrated components

Modularized components and equipment

results in:

– Flexibility in machine conguration

– Features may be added or altered to

accommodate process changes

– Construction rom proven, standard

components

– Simplied maintenance and parts re-

placement

– Lower equipment and operating costs

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Principal components o thedrum lter model TF

1. Drum

2. Drum drive

3. Support Frame

4. Tank

5. Vacuum Head

6. Agitator


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Options and accessories or TF and TFFlters

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Cake washingSpray bars may be tted to wash the cake in the dewatering zone.

Typically, the wash liquor joins the primary ltrate; however separate

discharge o liquor and primary ltrate is possible.

Cake washingFor lower moisture cake requirements a sealed hood may be tted to

pass superheated steam through the cake in the dewatering zone.

Cake repulperWhere the downstream process dictates, the drum lter may be tted

with water/liquor spray bars and cake repulping screw.

The screw is driven by a separate motor and gear reducer. The screw

shat is mounted in antiriction bearings and sealed using mechani-

cal (standard) or hydraulics means.

Wire winding attachment

For certain applications lter cloths are held onto the drum by meanso wire. The wire winder automatically eeds cloth attachment wire

onto the drum as part o the normal procedure o cloth replacement.

The device has a simple mechanical construction and includes drive

motor and gearbox.

– Adjustable to suit all drum diameters and lenghts

– Feed wire drum may be placed in any location near the lter

– Adjustable wire tensioning brake on guide wheel

– Manual vari-speed drive as optional extra

1. Wire guide wheel

2. Guide trolley and main

beam

3. Drive motor assembly

4. Idler sprocket assembly

5. Trolley drive chain

6. Feed wire drum and

support trestle

Snap blow cake discharge system

A short duration pulse o compressed air injected into each lter

sector immediately prior to the cake discharge point provides or:

– positive discharge o thick or sticky cakes cleaning o flter cloth

– short pulse inhibits blow back o ltrate into dry cake

Position and duration o the air pulse is adjustable. Pulses may be

either supplied on a continuous or intermittent basis as required.

Drum drive

– Thyristor controlled vari-speed drive

– Limit switch overload protection

– Continuous torque transmitter and overloadprotection.

Construction materials

Depending upon application drum lters are available in carbon steel

and stainless steel.

1. Induction transmitter

2. Control box

3. Cog wheel on drum drive shat

4. Sector at cake discharge point

5. Solenoid valve and air connection to vacuum valve

Drum lter with repulper attachments.



Drum– Rugged all welded steel construction

– Diameters rom 1200 to 3620 mm

– “Snap in” replacable segment grids

– Inspection/access manhole, drain and vacuum leakage “tell-tale”

– Selection o our drainage systems with capacities up to 350 m3/

min at max. 18 m/s fow velocity which minimizes internal pipe

wear and reduces riction losses

– Two separate drainage pipes per drum sector, to prevent liquid

“pu” back when using snap-blow cake discharge.

Drum drive– Standard 4-pole AC-motor, integral gear reducer and manual

speed variator

– Standard drum speed range 0.2 to 1.0 rpm

– Rubber compression pad to absorb shock loads on start-up

Support rame– Standard steel section all welded support rame

– One piece drum drive trestle bolted to the support rame

– Two piece support acilitates vacuum head removal or inspection

– Drum liting bracket at valve end to acilitate simple vacuum

head removal

Tank – Steel all welded construction bolted to the support rame

– Independent rom drum, drum drive, agitator and vacuum head

Central lubricator– Automatic grease lubrication to vacuum head and bearings

High capacity drum lter. (Note the size o vacuum head)

Vacuum head– Thick (30 mm) cast iron alloy or HD polyethylene wear ring and

mating housing to allow or remachining

– Three adjustable pressure springs or positive sealing between

head and wear ring

– Selection o heads to match each liquid drainage system

Drum support shat assembly– Full length shat to support drum, vacuum head and internal

drainage tubes

– “Ringeeder” tensioning element connection to drum heads

– Selection o three systems depending upon lter size, vacuum

head and machine capacity

Agitator– All welded “Y” blade construction or positive stirring

– Rotation eccentric to the drum shat or ull depth slurry stirring

– Minimum clearance between drum and tank

– Increasing drum clearance to allow or cake build- up

– Easy access to vacuum head

– Pivot support plate attachment allows mechanism to be swung

out o the tank or maintenance and inspection

– Standard 4-pole AC-drive motor and gear reduction box

– Drive motor, gear box and lower crank bearings are protected

rom spillages by removable inspection covers.

TF 3042 Rotary Drum Filters during shop assembly

Standard eatures model TF



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Cloth tracking systemCloth tracking is achieved by means o a single hinged guide pulley mounted in spherical

roller bearings ater the cloth passes rom the washing system. The guide pulley is positioned

by pneumatic diaphragm cylinders activated by optical or pneumatic sensors at each side o

the cloth. Correct cloth tension is maintained by adjustable counterweights acting via levers

to the cake discharge system.

The cloth tracking system

– Maintains cloth position within a ew mm

– Eliminates need or special cloth edgings

– Provides sel-adjusting cloth tensioning

Cloth washing systemCloth washing increases the capacity o the lter and extends the cloth service lie by preven-

ting blinding. Ater passing the cake discharge system the cloth is washed over its ull width

by two high pressure sprays, one above and one below the cloth. Wash water is conned by

a sot rubber curtain and collected or separate discharge through a launder.

Belt drum lter model BTF

A combination roller and ‘air-knie’ discharge

system is also available or difcult applications.

This type o discharge, in which the clearances

between the ‘air-knie’ lips and the cloth is

adjustable, avoids wear and replacement o the

knie lips in abrasive duties. In addition there are

oten benets in cloth cleaning by reduction in

wash water consumption.

For more difcult cakes an ‘air-knie’ may be

appropriate. The ‘air-knie’ consists essentially

o two hardened steel (or other wear material)

lips. The leading lip is proud o the ollowing

one and together they orm a slot across the ull

cloth width. Compressed air rom an air blower

or high pressure an is injected into the knie

tube and exits rom the slot onto the back o the

cloth. This cake discharge system is very eective

or thin and/or sticky cakes.

In many applications the simple ‘break roller’

system, where the cloth is passed over a small

diameter roller, is sufcient to eectively ‘break’

the cake away rom the cloth or discharge.

Cake discharge systems

1. Cake discharge system counter

weight and lever arms

2. Pneumatic diaphragm cylinder

3. Cylinder tensioning spring

4. Optical or pneumatic cloth edge

sensor

5. Guide pulley

Belt drum lters, model BTF, areidentical in all respects to the TF

range with one undamentalexception: cake discharge.With the belt drum lter thecloth is removed rom the drumater the dewatering zone andpasses over the cake dischargesystem beore washing andreturn to the drum prior to thecake pick-up zone. The three keysystem eatures o the belt drum

lter are thus:• cake dishcarge

• cloth washing

• cloth tracking



The top eed drum lter, model TFF, is especially suited or dewa-tering slurries containing coarser

solid ractions. The top eed prin-ciple promotes segregation o the coarser particles in the eedbox orming a “precoat” whichresults in a high ltration ratecake.

Our capability to incorporate veryhigh capacity vacuum heads andinternal drum drainage systems

into the TFF design results in highmachine capacities and lowermoisture cake.Standard eatures include:

– special seal between eed box and drum

prevents leakage o eed and reduces

mechanical wear o lter cloth

– snap-blow cake discharge

Optional eatures:

– high pressure water, air or water/air

mixture cloth cleaning between cake

discharge and eed point.

Top eed drum lters model TFF

System supply Typical vacuum lter system with ltrate

pump and vacuum receiver.

1. Vacuum receiver

2. Moisture trap (Normally used or aggresive

ltrate only)

3. Vacuum pump

4. Liquid separator

5. Silencer

6. Filtrate pump

7. Floor drain

For plants without a ltrate pump:

8. Drain line rom vacuum tank

(barometric leg)

9. Water lock

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Weight Weight Weight

Model A D L W1 W2 W3 H Filter excl. pulp excl. pulp excl. pulp

TF/BTF/TFF TF BTF TFF area TF BTF TFF

mm mm mm mm mm mm mm m2 ton ton ton

1206 600 1200 1600 1600 2200 1600 1600 2.2 1.2 1.3 0.81212 1200 1200 2200 1600 2200 1600 1600 4.5 2.0 2.1 1.6

1218 1800 1200 2800 1600 2200 1600 1600 6.8 2.8 2.9 2.2

1812 1200 1800 2500 2200 2700 2200 2300 6.8 3.9 4.5 4.4

1818 1800 1800 3100 2200 2700 2200 2300 10.0 4.2 4.8 4.7

1824 2400 1800 3700 2200 2700 2200 2300 14.0 4.5 5.2 5.0

1830 3000 1800 4300 2200 2700 2200 2300 17.0 4.8 5.6 5.4

2418 1800 2400 3260 2850 3500 2850 2865 14.0 8.8 9.7 5.2

2424 2400 2400 3860 2850 3500 2850 2865 18.0 9.1 10.0 6.0

2430 3000 2400 4460 2850 3500 2850 2865 23.0 9.5 10.4 6.8

2436 3600 2400 5060 2850 3500 2850 2865 27.0 9.7 10.6 7.6

2442 4200 2400 5660 2850 3500 2850 2865 32.0 10.0 10.9 8.4

3030 3000 3000 4480 3630 4310 3630 3480 29.0 9.8 10.3 10.7

3036 3600 3000 5080 3630 4310 3630 3480 34.0 10.9 11.5 11.2

3042 4200 3000 5680 3630 4310 3630 3480 40.0 12.0 12.7 –

3048 4800 3000 6280 3630 4310 3630 3480 46.0 13.1 13.9 –

3054 5400 3000 6880 3630 4310 3630 3480 52.0 14.2 15.1 –

3060 6000 3000 7480 3630 4310 3630 3480 57.0 15.3 16.3 –

3636 3600 3600 5160 3910 4600 3910 4075 41.0 11.5 13.0 9.0

3642 4200 3600 5760 3910 4600 3910 4075 48.0 12.5 14.0 9.5

3648 4800 3600 6360 3910 4600 3910 4075 55.0 13.5 15.0 –

3654 5400 3600 6960 3910 4600 3910 4075 61.0 14.5 16.0 –

3660 6000 3600 7560 3910 4600 3910 4075 68.0 15.5 17.0 –

3666 6600 3600 8160 3910 4600 3910 4075 75.0 16.5 18.0 –

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Dimensions or drum vacuum lters - Internal fow TF, BTF, TFF


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Metso Corporation, Fabianinkatu 9 A, P.O. Box 1220, FI-00101 Helsinki, Finland, tel. +358 20 484 100, ax +358 20 484 101, www.metso.com

Subject to alteration without prior notice Brochure No. 1583-03-11-ESBL/Sala-English © 2012 Metso Printed in Sweden

www.metso.com

E-mail: [email protected]

• Metso Minerals (Sweden) AB

Norrängsgatan 2, SE-733 38 Sala, Sweden, Phone: +46 224 570 00, Fax: +46 224 169 50

• Metso Minerals Industries, Inc.

2715 Pleasent Valley Road, York, PA 17402, USA, Phone: +1 717 843 8671

• Metso Minerals (South Arica) (Pty) Ltd.

Private Bag X2006, Isando, Johannesburg,1600, South Arica, Phone: +27 11 961 4000, Fax: +27 11 397 2050

• Metso Minerals (Australia) Ltd.

Level 2, 1110 Hay Street, West Perth, WA 6005, Australia, Phone: +61 8 9420 5555, Fax: +61 8 9320 2500

• Metso Minerals (India) Pvt Ltd

1th foor, DLF Building No. 10, Tower A, DLF Cyber City, Phase - III, Gurgaon - 122 002, India, Phone: +91 124 235 1541, Fax: +91 124 235 1601

• Metso Perú S.A.

Calle 5 Nro. 144, Urb. Industrial Vulcano, Ate, Lima 03, Peru, Phone: +51 1 313 4366, Fax: +51 1 349 0913

• Metso Minerals (Chile) S.A.

Av. Los Conquistadores 2758, Piso 3, Providencia, Santiago, Chile, Phone: +56 2 370 2000, Fax: +56 2 370 2039

• Metso Brasil Indústria e Comércio Ltda.

Av. Independência, 2500 Éden, 18087-101 Sorocaba-SP - Brazil, Phone: +55 15 2102 1300

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