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PolysiusRollerMills.ForgrindingPolysiusAcompanyofThyssenKruppTechnologiestk2Multitalentàlacarte.RollermillsfromPolysius–suitedtoeveryapplication....thusensuringtheefficientcomminutionofmaterialswithgreatlydifferingcharacteristicswithregardtogrindingresist-ance,abrasiveness,moisturecontent,granulometriccompo-sitionandflowproperties.Ourcomprehensiveprocessknowhow(includingextensivedatafromrawmaterialinvesti-gationsandgrindingtests),ourcontinuousresearchanddevel-opmentworkandourintensiveco-operationwithplantownersprovidethebasisfordepend-ablemachinedesignandarethereasonfortheimmensesuccessofPolysiusrollermillsallaroundtheworld.ThePolysiusscopeofsupplynotonlycoverscustom-tailoredrollermilldesignsforthrough-putratesofuptoandexceed-ing600tphanddrivepowersofupto6,000kW,butalsotheoptimisationofexistinggrind-ingplantsandabroadrangeofcustomer-specificservices.TheextensiverangeofPolysiusrollermillsprovidesrequirement-specificsolutionsfortheeconomic,reliableandenergy-efficientgrindingof:xrawmaterialsforthecementmanufacturingprocess,xgranulatedblastfurnaceslag,trass,pozzolana,xclinkerfordifferentcementqualities,xhardcoal,lignite,coke,petroleumcokeandsewagesludge,xclay,limestone,burntlimeandrawphosphateThePolysiusResearchandDevelopmentCentreusesthetest-rollermillAtrol(throughputapprox.240kg/h)forgrindabilitytestingandquantitativepredictionofwearinindustrialmills.RollermillforgranulatedblastfurnaceslaggrindinginChina.RollermillforcementrawmaterialgrindinginChina.RollermillforcementclinkergrindinginMexico.CoalgrindingplantinPoland.4AdvantagesofPolysiusrollermillsataglance:xHighoperatingreliabilityandavailability,aswellaseasysystemhandling,duetothefactthatgrinding,dryingandseparationalltakeplaceinasinglecompactunit.xConsistentlyhighproductqualitywithminimumenergyrequirement,duetotheintegratedhigh-efficiencyseparator.xHousingcontoursofmillandseparatoroptimallydesignedtotransportfinish-groundmaterialquicklyandreliablytotheseparatorandreducematerialcirculationswhichdisturbthegrindingprocess.xAdditionalreductionoftheenergyrequirementduetotheexternalmaterialcirculation.xVerylowpressuredropinthegrindingsystemduetooptimisationofthegasvelocityandgasdistributionbytheadjustablenozzlering.xOptimumfeedmaterialpull-inconditionsandgrindingefficiencyduetothedoublegroovegrindingtable.xConstanteconomyofoperationduetoinfinitelyvariablepressureadjustmentofthehydraulicsystem.xOveralleaseofmaintenanceduetothelargedoors,whicharesimpleandsafetohandle,andtothedismountingdevices,withwhichthegrindingrollersandtablelinerseg-mentscanbereplacedquicklyandwithoutanyproblem.xOutstandinglyeconomicmillhousingwearprotectionduetorequirement-specificselectionofmaterials.xUseofeconomicallyoptimumgrindingelementqualities–chromechilledcasting,hardfacing,ceramicmaterials.AssemblyofarollermillforgranulatedblastfurnaceslaggrindinginChina.5Thecorecomponentsoftherollermillinclude:xthewear-protectedgrindingtablewithdoublegroovegrindingtrackxtworollerpairunitswhichadaptindependentlytothebedofmaterialbyverticalmovementandbypivotingaroundtheirguidepinxthehousingxtheadjustablenozzleringxthedrivexthehigh-efficiencyseparatorxthehydraulicsystemxthedischargesystemandtheexternalmaterialcircuitxthefeedvalveandthefeedchute.DoublegrindingrollersystemTwodoublerollerpairunitsrotateonthedrivengrindingtable.Theprincipleofdoublerollerpairunitsresultsinalowspeeddifferencebetweenrollerandgrindingtableandthusinlowerwear.Theabilityofthegrindingrollerstomoveverti-callyenablesthemtoautomati-callycompensateforwearandmaintainanoptimumcontactbetweenthegrindingelementandthematerialbeingground.Ifonerollerisliftedbythebedofmaterial,theotherpressesdownevenmorestrongly.Thisinteractivemodeofworkingimprovesthegrindingeffect.Advantage:thethroughputandthespecificpowerrequirementremainconstantrightuntiltheendofthegrindingelements’servicelife.Thedifferentwearratesoftheinnerandouterrollersandgrind-ingtrackscanbeequalisedbyinfinitelyvariableadjustmentofthepointofforceintroductionintotherollercarrierinthedirection+Xor-X.Thisadjuststhegrindingforcedistributiontomatchthewear,therebymaximisingtheutilisationofthegrindingelements.Itisalsopossibletoturntherollerpairaround,sothattheouterrollermovestotheinsideandviceversa,whichresultsinauni-formwearprofileandthusinalongservicelife.DoublegroovegrindingtrackInthePolysiusrollermill,thedoublegroovegrindingtrackincreasestheretentiontimeofthematerialonthegrind-ingtable.Thisisaparticularadvantageinthecaseofmat-erialwithunfavourablegrindingpropertiesandatendencynottoformastablebed.Thedoublegroovegrindingtrackalsoensuresthatthebedofmaterialisnottoodeepandminimisestheamountofmat-erialpassingungroundbetweentherollersandthegrindingtable.Thisreducesthespecificpowerrequirement.6Thedetailsdecide...Hydrauliccylinderoftherollermill.AdjustablenozzleringThegasrequiredfortransportinganddryingthematerialinsidethemillflowsthroughthenozzlering.Thegasdistributionandvelocitycanbeoptimallyadjustedtosuittherequiredmaterialloadingordryingcapacity,thusminimisingthespecificgasflowrateandthepress