asphalt production in hafnarfjörður
TRANSCRIPT
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Asphalt production Asphalt production in Hafnarfjörðurin HafnarfjörðurOur vision is zero impact Our vision is zero impact (not zero vision)(not zero vision)
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Problems needing a Problems needing a solutionsolution
Existing plot too small for activitiesExisting plot too small for activitiesNot designed to adequately handle and treat Not designed to adequately handle and treat runrun--off off DustDustActivities not commensurate with Activities not commensurate with neighbourhoodneighbourhoodAsphalt plant not efficient & not able to meet Asphalt plant not efficient & not able to meet coming environmental regulations coming environmental regulations Not reliableNot reliableCapacityCapacity
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The view from Hringhella The view from Hringhella 6, Hafnarfjörður6, Hafnarfjörður
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AmbitionsAmbitions
Minimize environmental impact of asphalt Minimize environmental impact of asphalt production (be a good neighbour)production (be a good neighbour)
Eliminate dust problemEliminate dust problemTreat all runTreat all run--offoffRecycle asphaltRecycle asphaltBe innovative in our use of ressources, Be innovative in our use of ressources, development and new technologydevelopment and new technology
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Some main principles of Some main principles of asphalt productionasphalt production
Drum MixDrum MixStone and binder mixed Stone and binder mixed in rotating, heating drumin rotating, heating drumAdvantages includeAdvantages include
Simplicity (=>reliability)Simplicity (=>reliability)MobilityMobility
Problems includeProblems includeEmission can (depending Emission can (depending on type) include partly on type) include partly combusted binder => combusted binder => more load on filtermore load on filterSegregation in mixSegregation in mix
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Batch mix plantBatch mix plant
Advantages includeAdvantages includeBinder added after heating Binder added after heating of aggregates => emission of aggregates => emission only contains moisture only contains moisture and dustand dustMore flexibility viz More flexibility viz productionproduction
Disadvantages includeDisadvantages includeNot mobileNot mobilePerhaps not as energy Perhaps not as energy efficient as a drum mix efficient as a drum mix principleprinciple
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The batching towerThe batching tower
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Iceland´s biggest asphalt plantIceland´s biggest asphalt plant
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KVM Asphalt Plant type KVM Asphalt Plant type 4000/2504000/250
Max capacity 240 tph @ 5.5% moistureMax capacity 240 tph @ 5.5% moisture8 cold feed hoppers8 cold feed hoppersRAP hopper and elevator to mixerRAP hopper and elevator to mixerDrying drum with 24MW burner for LFODrying drum with 24MW burner for LFOBagfilter Bagfilter -- Reverse jet. Filter area 1040m², emission < 10mg/m³ at Reverse jet. Filter area 1040m², emission < 10mg/m³ at 20m/s 17%O2 using Nomex 400g/m2 bags20m/s 17%O2 using Nomex 400g/m2 bagsFiller storage 2 x 50m³ (imported & reclaimed)Filler storage 2 x 50m³ (imported & reclaimed)33½½ screening decks (4 sizes)screening decks (4 sizes)5 Hot aggregates silo for 85ton5 Hot aggregates silo for 85ton4000kg batch mixer4000kg batch mixer5m³ additive (fibres/colour) silo5m³ additive (fibres/colour) siloHorizontal skip, self propelledHorizontal skip, self propelled500ton hot mix storage in 5 silos500ton hot mix storage in 5 silos2 x 70m³ bitumen silos, heated with blending facility2 x 70m³ bitumen silos, heated with blending facility
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240 ton / hour240 ton / hour
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34 metres tall, horizontal 34 metres tall, horizontal skipskip
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Cold feed hoppersCold feed hoppers
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The drier & burnerThe drier & burner
8012016
020024
0280
2% 3% 4% 5% 6% 7%
0
500
1000
1500
2000
2500
3000
Brænderkapacitet kg/h
Tørrekapacitet t/h
Vandindhold i %
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Choosing the right burnerChoosing the right burner
Good air/fuel mixingGood air/fuel mixingShort, dense flame Short, dense flame Good heat radiationGood heat radiationEfficient combustionEfficient combustionFit for available fuel typesFit for available fuel typesLow excess of airLow excess of air
Increased drum Increased drum efficiency efficiency Decrease CO & NOx Decrease CO & NOx emissionsemissionsReduce air volume Reduce air volume through baghouse through baghouse (extend bag(extend bag--life)life)
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Bitumen, Filler and Aggregate Bitumen, Filler and Aggregate scales scales –– each with 3 load cells for each with 3 load cells for accuracy (=>quality, efficiency)accuracy (=>quality, efficiency)
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New paddle design New paddle design –– less less energy, shorter mixing timeenergy, shorter mixing time
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The baghouse The baghouse
Main purposes includeMain purposes include filler is recycled, not wasted filler is recycled, not wasted (as in wet scrubbers)(as in wet scrubbers) effcient removal of dust from effcient removal of dust from emission emission –– especially with especially with latest filter materiallatest filter material
Keywords:Keywords:Effective filtrationEffective filtrationMeet environmental regulations Meet environmental regulations
viz emissionsviz emissionsMinimimal temperature gradient Minimimal temperature gradient
across filter (heat loss & across filter (heat loss & condensation)condensation)
Minimal pressure gradient across Minimal pressure gradient across filterfilter
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The Filter bagsThe Filter bags
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Filter bags (cont.)Filter bags (cont.)
Total of 572 bagsTotal of 572 bagsMaterial is Nomex Material is Nomex 400g/m2400g/m2New types & fabrics New types & fabrics being developed all being developed all the timethe time
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Cleaning the filterCleaning the filter
Remove some, not all Remove some, not all the dust cakethe dust cakeTwo methods commonTwo methods common::
PulsePulse--jetjetReverse AirReverse Air
Filler transported to Silos Filler transported to Silos from where excess is from where excess is processed (sludged) to processed (sludged) to waste containerwaste container
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Land considerationsLand considerations
Wind directions prevailingWind directions prevailingGeology & seismologyGeology & seismologyDrainage, runDrainage, run--off, waste water treatmentoff, waste water treatmentSurfacing & dust controlSurfacing & dust controlLayLay--outout
Logistics Logistics Internal transportInternal transportSafety Safety SpaceSpace
Other environmental requirementsOther environmental requirements
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43000 fm
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Sand traps
18000 ltr
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Oil separators with sand traps
22000 ltr5000 ltr
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FutureFuture
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Ambitions / goalsAmbitions / goals
Reduce temperatureReduce temperatureReduce CO2 emissionsReduce CO2 emissionsAlternative bindersAlternative binders
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«« 3E3E » ASPHALT» ASPHALT
1. 1. EEnvironmentallynvironmentally--friendlyfriendly2. 2. EEconomicalconomical--savingsaving3. 3. EEnergynergy--savingsaving
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Objectives Objectives withwith
3E 3E AsphaltAsphalt
ReduceReduce mixingmixing temperaturetemperature by 40°Cby 40°CTo To achieveachieve
LessLess
emissionsemissionsReducedReduced
fuel fuel consumptionconsumption
andand
therebythereby
reducedreduced
CO2 CO2 emissionemission
WhilstWhilst maintainingmaintaining//improvingimproving workabilityworkability ofof thethe mixmix
WhilstWhilst preservingpreserving//improvingimproving mixmix propertiesproperties
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3E 3E Methods in ColasMethods in Colas3E LT : 3E LT : Use of additivesUse of additives
3E DM: 3E DM: Mixing with soft bitumen first Mixing with soft bitumen first followed by hard, foamed bitumenfollowed by hard, foamed bitumen
3E DB: 3E DB: Mixing with soft bitumen first Mixing with soft bitumen first followed by hard bitumenfollowed by hard bitumen
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Future (cont.)Future (cont.)
Filtration technologyFiltration technologyHeat exchanging in productionHeat exchanging in productionIncreased recycling of asphaltIncreased recycling of asphalt
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Thank youThank you