Vapour Recovery Units

www.seventech.it

VRUsVapourRecoveryUnits

www.seventech.it

Werecognizetwomainvapourcontrolsolu4ons

VaporRecoveryUnits(VRUs)

VapourCombus4onUnits(VCUs)

EvenifaVapourCombus4onUnitiscapabletoac4veisgoal,limi4ngtheemissionsthiswaymeanstoburneverythingathightemperatures,thisinvokeshighnoiselevel,intrinsictemperaturerisksinexplosivefindproximity,completelossoftheproductsthemselves.That'swhyweourac4vityisfocusedinmanagingVapourRECOVERYUnits.

AgoodworkingVRUisalwaysworthitsguidinginvestment.AVRUopera4nginop4malconfigura4onwillrecoverinaverage1‰oftheprocessedproducts,sendingbackVOC'stotanksasrealgasoline.Thismeanspoten4allythousandsoflitersperday.

Theprofitcomingfromrecoveredgasolineisusuallymuchhigherthantheelectricpowerandplantmaintenanceexpenses,soasfarasmoneyisconcerned,respec4nglawswithlowVOC'semissionlevelturnitselfinagoodbusiness.

Let'sseethemainpointsofinterestinkeepingalowemissionlevel:

-AIR+Vola4leLiquids=Vola4leOrganicCompounds(VOCs)-VOCs+Sunlite(UV)+Combus4onProducts(Nox)=OZONE

Ozoneistobeconsideredprimarycons4tuentinSMOG;

OzonehasharmfulleffectsonHumanHealthandcandamagevegeta4on;

CEes4matethatstorageanddistribu4onofgasolinecontributesinexcessof500,000tons/year(morethan5%)tothetotalcommuni4esVOCemissions;

www.seventech.it

www.seventech.it

TipicalsourcesofVOCsemission

Refineryplants

StorageTanksandtheirprocessVENTS

Transporta4onOpera4ons

Distribu4on

Factorsaffec4ngVapourcomposi4on:

LoadingmethodUnloadingmethod

TemperatureVapourpressure

Pressure

VRUsProcessTheory:

Adsorp4onviafreshgasolinesprayingAbsorp4onviaAc4vatedCarbon

Regenera4onofCarbonBedsviaVACUUMProcess

The“MAGIC”inAdsorp4on/Absorp4on:

ABsorp4on

generallyitreferstowhenatoms,molecules,orionsenteringsomebulkphase:gas,liquidorsolidmaterial,undercertaincondi4ons.Forinstance,aspongeabsorbswaterwhenitisdry.

ADsorp4on

issimilar;butreferstoasurfaceratherthanavolume:adsorp4onisaprocessthatoccurswhenagasorliquidsoluteaccumulatesonthesurfaceofasolidoraliquid(adsorbent),formingamolecularoratomicfilm.Itisdifferentfromabsorp4on,inwhichasubstancediffusesintoaliquid(orsolid)toformasolu4on.

Weconsideruniversallyacceptedthecarbonadsorp4on/absorp4onvapourrecoveryprocess

PROS:-Worldwideacceptanceasthestandardforgasolinevapourrecovery-Manyyearsofprovenandreliableexperience-Highestemissioncontrolefficiency,meetsallemissionstandards-Lowestcapitalinvestmentandopera4onalcosts-Rela4velysimpletooperateandmaintain,noextremeexper4serequired-Nearambientpressureandtemperatureopera4on,novapourholderandnorefrigera4onrequired-Reducedelectricpowerconsump4onwithop4miza4onprocess

CONS:-Accuratemeasurementofrecoveredproductrequiresspecialequipments

www.seventech.it

www.seventech.it

ACTIVATEDCARBONisthe“CORE”

ofavaporrecoverysystem

Ac#vatedCarbonStructureAc4vatedcarbonishighlymicroporous,itcontainsbillions

ofporesofdifferentdimensions:

-Micropores<20angstroms-Mesopores20to500angstroms-Macropores>500angstromsAnamstrong=0.0000001millimeter

Anaveragehumanhairis500,000angstromsindiameter

EXTREMELYHIGHSURFACEAREA

500to2,500m²perGram

Keyproper4esforHydrocarbonRecovery:

- HighAdsorp4oncapacity- Lowreten4vity- Uniformpar4clesize- Thermal/chemicalstability- Longservicelife

www.seventech.it

Poressizeaffectsac4vatedcarbonappliances

10 MICROPORE 20 MESOPORE 50

GASMASK

SOLVENTSRECOVERY

GASOLINE

Herewearetotherealprocess,howitworks?

- AVRUcouldbeconsideredasafilter:ThefilterprocessestheHCvapourandairstreamcomingfromtheloadingbays,keepsthehydrocarbonvapoursandletsthecleanedairtopasstrough.

- The“adsorp4on”process,whichisaprocessthatoccurswhenagas(HCvapours)accumulatesonthesurfaceofasolid(ac4vatedcarbon),iscarriedoutbytheac4vatedcarbonwhichisinsidethecarbonbeds.

- Theadsorp4onprocessisexothermicand,therefore,itreleasesheatinasimilarwayascondensa4on

- HCvapoursreachtheVRUpushedbythepressureofliquidwhichisfillingthetank.- Duringtheadsorp4onprocess,thefiltergetssaturatedtothepointwhichitisnotcapableto

adsorbanymorevapours.- TheVRUunithastwocarbonbedstoensureuninterruptedservice.ASVOCsarebeing

adsorbedintheon-linecarbonbed,thesecondbedisbeingregenerated.- Duringregenera4on,Hydrocarbonsareremovedfromtheac4vatedcarbonbypullingadeep

vacuumonthebedbyavacuumpumpingdeviceandaresenttothenextstepintheprocess.- Hydrocarbonvaporsandcondensedhydrocarbonliquidsfromtheregenera4onprocessare

dischargedfromthevacuumsystemintoaseparatorvessel.- Typically,aliquidringvacuumpumporadrypump,some4mescombinedwithaposi4ve

displacement pump,isusedtoprovidethenecessaryvacuumlevelforregenera4on.- Theseparatorvesselisnecessarytoseparatethesealfluidfromtherecoveredhydrocarbon

vaporsandcondenseshydrocarbonliquid.Thesealfluidiscooledandreturnedtothevacuumsystem.

- Ifadryvacuumpumpisusedthereisnoneedforaseparator- Thenon-condensedhydrocarbonvapors,mixedwithasmallamountofair,flowfromthe

separatorvesseltothepor4onoftheprocesswheretheactualrecoveryoccurs.- Theactualrecoveryisaccomplishedinapackedabsorbercolumn,whichusestheproduct

fromthestoragetankasabsorberfluid.- Hydrocarbonliquidiscollectedinthebooomoftheabsorbertowerandispumpedtoliquid

storage.- Airandtheuncondensedhydrocarbonsarerecycledbacktotheon-linecarbonvessel.- Applica4onsincludegasolinevapours,sweetcrudeoilvapours,certainchemicalsincluding

lightalkanes,propaneandheavier;lightalkenesincludingbuteneandheavierandlightaroma4csincludingbenzene

www.seventech.it

Thegas,suckedthroughthesuc4onportisledandcompressedbytheliquidringthatrotateseccentricallywithrespecttotheimpellerfromwhichitgetsthenecessaryenergy.Whenopera4ng,partoftheserviceliquidisdischargedthroughthedischargeporttogetherwiththecompressedgas.Apropermake-upoffreshliquidguaranteescorrectopera4onandperformances.

www.seventech.it

PumpBody(casing)

Rota4ngunit(impeller)

Liquidring

HCVapours

VRUfunc4oningschema

StorageTank

Liquidproductloaded

SupplypumpON

ReturnpumpON

VacuumpumpON

GlycolpumpON

PurgeON

Carbon

bed

in

regene

ra4o

n

Carbon

bed

Online

Clean

air

LiquidringVacuumpumpdetails

LiquidringVacuumpumpsec4onview

www.seventech.it

Dryvacuumpump

Dryvacuumpumpdoesnotneedanyglycoloraseparator.Allheatofcompressionstaysinthepumpedgas.

-Toreachdeepvacuumadualstagepumpisused.Thedischargeofthefirststageisthesuc4onofthesecondone.Bothrotorsareinstalledonthesameshap.

Dryvacuumpumpsec4onview

Thepumpoperatesonscrewtechnology.Enteringgasesaretrappedbetweenflightsofscrewsandmovedaxiallydownashortstraightpathtotheexhaustwheretheyaredischarged.

www.seventech.it

1.Inlet 6.GasPath2.Exhaust 7.TimingGears3.WaterJacket 8.Bearings4.Screw 9.ShapSeals5.Oil 10.OilSeal

VRUremotemanagement

TheVRUwouldberemotelymanaged.TheuniqueSCADAsystemgivesacompleteanddetailedview,mainjobfunc4onscontrol,withnoneedtoreachthefiledforusualopera4ons.

www.seventech.it

VRUremotesurveying

ThewholeVRU’sworkingparametersatasight.AdeepandhistoricalstructuredALARMandWARNINGsystemadvisesoperatorsofanyunaoendedcondi4onandhelpsiden4fyingthecausesofproblems.

VRUtrendingu4li4es

Historicaldatastorageisextremelyuseful.Itinvolvesrepor4nganddeploydataanalyzingtoolsusedbythetechnicianstoop4mizeVRUsperformances

www.seventech.it

VRUsezngmul4plescreens

SCADAsystem,viapasswordprotecteddatascreens,letsthetechnicians(anddeeplytrainedpersonnel)toimmediatelyadjusttheprocessparameters,inordertoop4mizetheworkingcycle.

www.seventech.it e-mail Italia: office@seventech.it Firenze Italia: Bucharest Romania:e-mail Romania: eurotehnic@micso.net Via Benedetto Dei 5, int 8 B-dul Camil Ressu nr.15 Tel: + 39 055 4369030 Firenze 50125 Bucuresti Sector 3 Romania