facts in detail - lenntechthe bollfilter automatic type 6.18.2: a special filter for special...
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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
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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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