2000

/10/

2010

Overview and Product Selector:

6.18 Series BOLLFILTERS

•TYPE6.18/6.19issuitableforall

standard applications of water

filtration and is more than ade­

quate in termsof capacity, pre­

cision and reliability, even in

demandingenvironments.

•TYPE 6.18.2 Heavy Duty repre­

sentsaspecialsolutiononlyre­

quired in exceptional cases for

extremely harsh conditions of

use, such as filtration of water

withveryhighparticlecontami­

nation.

•TYPE6.18.2BWTisintendedasa

"singleunit"solutionexclusively

for mechanical prefiltration of

seawatertoprotectballastwater

managementsystemsonships.

BOLL&KIRCHwillbehappytohelpyouselectthebestsolutionforyourfiltrationrequirements.

Facts in detail:

Technical Data

TYPE 6.18.2 BOLLFILTER Automatic / Automatic filter with filter medium backflush

Area of application: Filtration of water with high particle contamination

Volume flow: 9,000 m3/h max

Grade of filtration: 50 microns – 2 mm

Design pressure: 6 bar / 10 bar (higher pressure available on request)

Inlet/outlet: DN 200, 250, 300, 350, 400, 500, 600, 700, 800, 900

Housing material: Carbon steel or CrNi steel, fabricated

Backflush control: Timer or differential pressure dependent

Filter elements: Cylindrical filter candles, open at each end, with Hydrodynamic Element

TheBOLL&KIRCHproductrangecoversautomaticbackflushfiltersforwaterfiltrationrangingfromthebasicmodel

TYPE6.18/6.19andtheTYPE6.18.2HeavyDutyandTYPE6.18.2BWTversionsthroughtonumerousapplication­spe­

cificsystemsolutionsforspecialuses.Pleasenote:

Lenntechinfo@lenntech.com Tel. +31-152-610-900www.lenntech.com Fax. +31-152-616-289

BOLLfiLter Automatic tYPe 6.18.2

Filtration of water with very high particle contamination

Heavy Duty

Progress by innovation

Lenntech

HiGH-PerfOrMANCe fiLter fOr WAter treAtMeNt

Filtration

Duringfilteroperation,thewatertobefilteredentersthe

filter housing through the inlet flange 1. Some of the

unfiltered water flow is fed via the riser 2 in the filter

elementinsertintotheuppersectionofthefilterand,asa

result,intothefilterelements3fromabove.Thismeans

thatthewaterflowsintothefiltercandlefrombothabove

andbelow.Thisresultsinorganicandinorganicparticles

beingcapturedintheinsideofthefiltercandle.Theclean

waterreachesthefilteroutlet4 throughthefilterelementslot.

Backflushing

During the backflushing cycle, initiated by differential

pressureand/oratimer,thefilterelements,whichareopen

The principle behind it:

Dual filtration, dual flushing

Backflushing

The BOLLFiLTer Automatic

Type 6.18.2:

A special filter for special applicationsThenewBOLLfILTERAutomaticType6.18.2isaback­

flushfilterthathasbeenspeciallydevelopedforfiltering

waterunderhighlydemandingconditions.Typicalfields

ofapplicationforthisfilterarenon-prefiltered river water

and highly fibre-laden process water (white water) in

paper manufacture.

InorderthattheBOLLfILTERAutomaticType6.18.2can

deliveroptimumfiltration,atveryhighlevelsofparticle

contamination,oncontaminationthatisdifficulttoremove

and at low working pressures, the proven principle of

dualfiltration(wherecrossandcounterflowbackflushing

is generated) has been supplemented by an efficient

dual backflush function. Rotating flushing arms are

locatedbothaboveandbelowthefilterelementassem­

bly. The filter elements are flushed alternately (i.e. not

simultaneously)withthefiltermediumfromaboveand

below,withoutanyinterruptiontotheoperation.Inaddi­

tion,thenewlydevelopedHydrodynamicElementresults

inanincreaseinthebackflushvelocityintheindividual

filter candle slots. Together with the dual backflush

system,thisresultsinparticularlythoroughflushingofthe

entirefilterarea.

Power stations, steelworks and rolling mills,

paper manufacture and the chemicals industry are typical areas where the BOLLfiL-ter Automatic 6.18.2 is used.

High-intensity crossflow flushing around the Hydrodynamic Element

1

8

6

HiGH-PerfOrMANCe fiLter fOr WAter treAtMeNt

Heavy-duty filter design:

High performance for high particle contamination

TheBOLLfILTERAutomaticTYPE6.18.2impresseseven

underthemostdemandingconditions,duetoitsexcellent

precisionandreliability.Oneofthemainreasonsforthis

isthatitisequippedwithspeciallystabilisedduplexfilter

elements. These are open at both ends allowing the

waterforfiltrationtoflowthroughfromeachend.Dueto

their length and increased diameter, their filter surface

area is especially large. The Hydrodynamic Element

locatedinthemiddleofthefilterelementresultsinad­

ditional increase in velocity, maximising the backflush

effect.Themaximisedbackflusheffectprovidedbythe

Hydrodynamic Element and alternating

flushing function ensure trouble free

operation and reduce the risk of

blocking.

at both ends, are alternately flushed in sequence from

aboveandbelow,withoutanyinterruptiontothefiltra­

tionoperation.Toachievethis,thegearmotor5rotates

the flushingarms6 past the individualelementopen­

ings. Simultaneously, the flushing valve 7 is opened.

Theresultingdropinpressureinsidetheelement(system

pressure toatmospheric)reverses theflowthroughthe

filterelement,thisflushesthecapturedorganicandinor­

ganicparticlesoutoftheelements.Atthesametime,the

HydrodynamicElement8 located in the centreof the

filter element causes thebackflushvelocity to increase

further and disperse the backflush energy evenly over

theelement.

Backflushing Filtration

Filter elements open at both ends

Flushing arms offset by 90°

Filter element with duplex flushing device

Flow simulation of dual flushing from alternate ends on a filter element with Hydrodynamic Element.

Hydrodynamic element

Filter element

- +Intensity of flush effect

Filtration Backflushing

Upper flushing arm offset by 90°

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2

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