EP0114118B1 - Procédé et dispositif de fabrication d'asphalte - Google Patents

Procédé et dispositif de fabrication d'asphalte Download PDF

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Publication number
EP0114118B1
EP0114118B1 EP84300257A EP84300257A EP0114118B1 EP 0114118 B1 EP0114118 B1 EP 0114118B1 EP 84300257 A EP84300257 A EP 84300257A EP 84300257 A EP84300257 A EP 84300257A EP 0114118 B1 EP0114118 B1 EP 0114118B1
Authority
EP
European Patent Office
Prior art keywords
aggregate
holding
reclaimed asphalt
asphalt
reclaimed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84300257A
Other languages
German (de)
English (en)
Other versions
EP0114118A1 (fr
Inventor
Bertram Keith Wenban
David John Leonard
John Peter Winfield Mannes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ExxonMobil Oil Corp
Original Assignee
Mobil Oil Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mobil Oil Corp filed Critical Mobil Oil Corp
Priority to AT84300257T priority Critical patent/ATE28484T1/de
Publication of EP0114118A1 publication Critical patent/EP0114118A1/fr
Application granted granted Critical
Publication of EP0114118B1 publication Critical patent/EP0114118B1/fr
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof

Definitions

  • This invention relates to the manufacture of asphalt and more particularly to a process and apparatus for manufacturing asphalt mixes in which at least a portion of the starting material comprises salvaged or reclaimed asphalt.
  • reclaimed asphalt provides advantages not only in that it reduces the quantity of virgin or new material required to produce a given batch of asphalt but also because it reduces the problems of disposing of old asphalt which, for example, may have been removed from the surface of a roadway.
  • Salvaged or reclaimed asphalt which contains bitumen is not suitable for incorporation into conventional asphalt making processes.
  • the materials are raised to a relatively high temperature to produce an adequate transfer of heat.
  • bitumen may degrade and it may create a pollution problem.
  • the reclaimed materials which contains bitumen may become tacky so that it is particularly difficult to handle and to assimilate in the asphalt making process particularly in relation to batch plant operations.
  • higher operating temperatures inevitably lead to increased energy consumption and maintenance costs.
  • the present invention seeks to provide a process for producing asphalt which utilizes at least a proportion of reclaimed asphalt as a starting material and which alleviates or minimises the above difficulties, and an apparatus for carrying out such a process.
  • Filler material may be added as required.
  • a proportion of the screened aggregate may be diverted into the reclaim holding compartment to effect a degree of preblending and preferably heat transfer of the aggregate and asphalt in the reclaim holding compartment.
  • the aggregate preferably is diverted in the same proportions in which it is fed to the screening step.
  • apparatus for use in such a process, the apparatus comprising a batch tower including a plurality of aggregate holding compartments for holding preheated aggregate and at least one reclaim holding compartment for holding reclaimed asphalt, characterized in that the reclaim holding compartment is in heat-exchange relationship with at least one of the aggregate holding compartments so that, in use, heat may pass from the preheated aggregate to heat the reclaimed asphalt.
  • the apparatus may also include at least one cold feed hopper for storing starting material aggregate.
  • the apparatus includes a plurality of cold feed hoppers for storing aggregate of various sizes to be used in producing the final mix.
  • the apparatus in accordance with the invention may include six cold feed hoppers.
  • the apparatus preferably includes a dryer for aggregate.
  • a belt conveyor or the like may be provided to transfer aggregate from the cold feed hoppers to the dryer to preheat and dry the aggregate.
  • the belt feeding conveyor may be controlled by means of an automatic control system to ensure that the correct proportion of aggregate is fed from each cold feed hopper.
  • the hot and dried aggregate may be transported to the batch tower by means of a transfer belt, elevator or other suitable means.
  • the apparatus may include a sizing screen arrangement for separating the preheated and dried aggregate into various grades and a holding system for holding the graded material.
  • the sizing screen arrangement may be provided in any suitable form to separate the aggregate into any suitable number of size ranges as may be desired.
  • the holding system may include one or more separate compartments for holding sized and graded aggregate.
  • Each holding compartment is preferably provided by an aggregate holding bin.
  • the aggregate holding bins may be arranged in any convenient manner and preferably are arranged in line beneath the sizing screen arrangement.
  • the aggregate holding compartments may be provided as separate aggregate compartments within a holding bin.
  • the aggregate holding bins or compartments are arranged in mutual heat transfer relationship thereby to provide heat transfer therebetween and to minimise heat loss and temperature variation.
  • the reclaim holding compartment may be provided by means of a reclaim holding bin or a reclaim holding compartment of an aggregate holding bin.
  • the reclaim holding compartment is located in heat transfer relationship with at least one aggregate holding bin, preferably such that it receives optimum heat transfer from the aggregate holding bin or bins. This arrangement permits transfer of heat between the dried and heated aggregate held in the holding system and the reclaimed material.
  • Each holding bin may include one or more outlet gates for the discharge of held material.
  • the outlet gate of the preferred reclaim holding bin is arranged such that it enhances mixing of the aggregate and reclaimed material.
  • the outlet gate of the reclaim holding bin may be located between the outlet gates of the aggregate holding bins.
  • the apparatus of the invention preferably includes also a separate recycle feed hopper for storing reclaimed asphalt material to be recycled prior to it passing to the reclaim holding bin.
  • the reclaimed material which is stored in the recycle feed hopper may be metered to the reclaim holding bin through a separate recycle belt feeder as desired.
  • the recycle belt feeder preferably is controlled by the same automatic control system as that preferably used for controlling the preferred belt feeding arrangement associated with the aggregate feed hoppers. This permits the proportions of aggregate and reclaimed material to be relatively adjusted as required.
  • the reclaimed material may be transported to the batch tower by means of a transfer belt or elevator.
  • a conveyor belt is used to transfer the reclaimed material from the recycle hopper to the appropriate holding compartment.
  • the reclaimed material preferably is arranged to enter the reclaim holding compartment or bin approximately at the centre thereof.
  • the apparatus may include a weighing hopper for receiving aggregate and/or reclaimed asphalt from the batch tower.
  • the proportion of aggregate and reclaimed asphalt discharged from the holding bins into the weighing hopper may be controlled according to the grade of mix required in the final batch.
  • Bitumen may be added to the mix from a suitable bitumen storage tank or other facility.
  • the bitumen preferably is added to the mix in a suitable mixing chamber.
  • Filler materials such as fine material or powder may also be added to the mixing chamber or elsewhere.
  • An associated filler tank or silo may be provided for this purpose.
  • fines may be collected by extraction from exhaust of the preferred aggregate dryer and used to provide at least part of the filler. Extraction may be by means of a bag filter for example.
  • a diverter gate may be associated with the reclaim holding compartment or bin.
  • the diverter gate may be arranged to run along a dividing wall between the aggregate holding bins and the reclaim holding bin. Preferably the diverter gate runs the full length along the dividing wall.
  • the diverter gate may be actuated to draw at least a proportion of aggregate into the reclaim holding bin.
  • the degree of blend and heat transfer may be controlled to some extent by adjusting the speed of the belt conveyor supplying the reclaimed material and/or the position of the diverter gate.
  • the diverter gate may be located on the underside of the sizing screen. Preferably the diverter gate is positioned across the full length of the sizing screen. The diverter gate may be adapted to draw aggregate into the reclaim holding bin preferably in the proportions in which they are fed to the screen by the hot elevator.
  • the quantity of aggregate material which is diverted into the reclaim holding bin preferably is a function of the position of the diverter gate.
  • the diverter gate may be arranged to divert for example from 0 to 30% or more of the incoming aggregate into the reclaim holding bin and the amount will depend upon the position of the gate.
  • the position of the diverter gate may be set by adjusting a manual stop.
  • the diverter gate preferably is actuated pneumatically from a control station.
  • the proportion of aggregate which enters the reclaim holding bin thus may be adjusted by selecting the corresponding gate stop position.
  • the proportion of reclaimed material which enters the reclaim holding bin preferably is selected by the belt feeder speed and discharge gate opening of the recycle feed hopper.
  • the aggregate material feeders are driven in the correct proportions to the reclaimed material feeder so that the blend in the reclaim holding bin is as designed to suit parameters of the mix and the materials.
  • the belt feeders preferably operate on a pre-calibrated drive volumetric basis which does not fluctuate with moisture.
  • a load cell preferably is provided on a recycle transfer belt to indicate presence of reclaimed material. This may provide an operator with information as to when the diverter gate should be operated to commence the simultaneous flow of reclaimed and aggregate materials into the reclaim holding compartment.
  • a diverter chute may be provided at the end of the sizing screen to permit material passing over the top deck to be diverted into the reclaim holding bin so that for coarse mixes using all new materials the reclaim bin can be used as the largest stone bin.
  • the process and apparatus described above provides versatility in the proportion of reclaimed material able to be fed through the asphalt making system.
  • the process allows time for heat transfer between reclaimed material and raw aggregate and may be readily set and adjusted in accordance with the appropriate mix design.
  • the temperature of the blend is permitted to stabilize and become uniform due to progressive heat transfer or "heat soaking" which occurs at the holding stage and to a further extent at the preblending and mixing stages.
  • the temperature of the final mix is such as to avoid undesirable degradation of the bitumen in the final mixing stage.
  • FIG. 1 there are shown six cold feed hoppers 10 for storing virgin aggregate material.
  • the aggregate material is metered accurately by six corresponding belt feeders 11 having variable speed drive adjustable by means of an automatic feedback control system (not shown).
  • a transfer belt 12 transfers the aggregate material to a dryer 13.
  • the dried and hot aggregate material is transported to a sizing screen 15 of a batch tower by means of a hot elevator 14.
  • the batch tower includes four holding bins 16 for holding graded aggregate after the latter passes through the sizing screen 15.
  • a fifth holding bin 18 is provided alongside holding bin 16 for accepting reclaimed material.
  • the reclaimed material is supplied from a separate feed hopper 19 and is metered to the system via a belt feeder 20.
  • Recycle feeder 20 is controlled automatically in correct proportion to the aggregate feeders.
  • the reclaimed material is elevated to the fifth holding bin 18 by means of a conveyor belt 21.
  • a diverter gate 22 is provided along a dividing wall 23 between holding bins 16 and 18.
  • the diverter gate 22 is selectively positioned by means of a pneumatic control system (not shown) to divert from 0 to 30% or more of incoming aggregate into holding bin 18 as may be required.
  • the sizing screen 15 When not recycling, the sizing screen 15 may be fitted with a diverter chute (not shown) to divert coarse material into holding bin 18. Holding bin 18 then acts as the largest stone bin.
  • Holding bins 16 and 18 are provided with a plurality of outlet gates shown generally at 24. Material is discharged via the outlet gates to a weighing hopper 25. Finally, bitumen, and filler if used, is added to the mix prior to it being blended and discharged for transport.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Working-Up Tar And Pitch (AREA)
  • Road Paving Machines (AREA)
  • Processing Of Solid Wastes (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Claims (11)

1. Un procédé de préparation de mélange d'asphalte dans lequel au moins une partie de la matière première est constituée d'asphalte récupéré, ce procédé comprenant les étapes suivantes:
- on apporte au moins une qualité d'agrégat (10);
-on transfère (11, 12) dans un sécheur (13) une quantité mesurée de l'agrégat pour le sécher et le chauffer;
- on tamise (15) l'agrégat séché et chauffé dans des compartiments de réserve séparés (16) selon sa qualité;
- on apporte une quantité (19) d'asphalte récupéré de consistance convenable;
- on évacue l'agrégat des compartiments de réserve pour effectuer au moins un mélange partiel de l'agrégat et de l'asphalte récupéré; et
- on ajoute du bitume au mélange partiel d'agrégat et d'asphalte récupéré,
et étant caractérisé en ce que l'asphalte récupéré est transféré dans un compartiment de réserve de récupération chauffé par un échangeur de chaleur constitué par l'un au moins des compartiments de réserve d'agrégat, et physiquement séparé pour permettre un échange de chaleur entre l'agrégat séché et chauffé et l'asphalte récupéré avant leur mélange.
2. Un procédé selon la revendication 1, comprenant l'étape supplémentaire du mélange final de l'agrégat, de l'asphalte récupéré et du bitume.
3. Un procédé selon la revendication 1 ou 2, comprenant la dérivation (22) d'une partie de l'agrégat tamisé vers le compartiment de réserve de recyclage pour effectuer à un certain degré un prémélange et un transfert de chaleur.
4. Un dispositif destiné à la fabrication de mélange d'asphalte dans lequel au moins une partie de la matière première est constituée d'asphalte récupéré, cet appareil comprenant une tour pour lots qui comprend elle-même une pluralité de compartiment 16 de réserve de l'agrégat pour conserver l'agrégat préchauffé et au moins un compartiment (18) de réserve de récupération pour conserver de l'asphalte récupéré, caractérisé en ce que le compartiment (18) de réserve de récupération se trouve chauffé par un échangeur de chaleur constitué par l'un au moins des compartiments (16) de réserve d'agrégat de telle sorte que, en cours d'utilisation, de la chaleur peut passer de l'agrégat préchauffé vers l'asphalte récupéré pour le chauffer.
5. Un dispositif selon la revendication 4, dans lequel la tour pour lots comprend également des moyens de tamisage pour séparer selon ses dimensions l'agrégat préchauffé dans des compartiments de réserve d'agrégat.
6. Un dispositif selon la revendication 5, dans lequel les moyens de tamisage comprennent un tamis de classement par dimension (15) situé au-dessus des compartiments de réserve de l'agrégat.
7. Un dispositif selon l'une quelconque des revendications 4 à 6, dans lequel chaque compartiment de réserve comprend au moins une porte de sortie (24) pour évacuer le matériau conservé.
8. Un dispositif selon l'une quelconque des revendications 4 à 7, dans lequel le compartiment de réserve de récupération comprend une porte de dérivation (22) que l'on peut manipuler pour faire passer au moins une portion de l'agrégat dans le compartiment de réserve de récupération.
9. Un dispositif selon l'une quelconque des revendications 4 à 8, qui comprend également. une trémie (25) de pesée pour recevoir de l'agrégat et de l'asphalte récupéré provenant des compartiments de réserve.
10. Un dispositif selon l'une quelconque des revendications 4 à 8 ou la revendication 9, comprenant une chambre de mélange pour recevoir l'agrégat et l'asphalte récupéré provenant respectivement des compartiments de réserve ou de la trémie de pesée.
11. Un dispositif selon l'une quelconque des revendications 4 à 10, comprenant en outre une alimentation en asphalte récupéré, réglée en fonction de la quantité d'agrégat.
EP84300257A 1983-01-17 1984-01-17 Procédé et dispositif de fabrication d'asphalte Expired EP0114118B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84300257T ATE28484T1 (de) 1983-01-17 1984-01-17 Verfahren und vorrichtung zum herstellen von asphalt.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPF763283 1983-01-17
AU7632/83 1983-01-17

Publications (2)

Publication Number Publication Date
EP0114118A1 EP0114118A1 (fr) 1984-07-25
EP0114118B1 true EP0114118B1 (fr) 1987-07-22

Family

ID=3769934

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84300257A Expired EP0114118B1 (fr) 1983-01-17 1984-01-17 Procédé et dispositif de fabrication d'asphalte

Country Status (8)

Country Link
EP (1) EP0114118B1 (fr)
JP (1) JPS59182855A (fr)
AT (1) ATE28484T1 (fr)
AU (1) AU2250183A (fr)
CA (1) CA1229082A (fr)
DE (1) DE3464939D1 (fr)
NZ (1) NZ206755A (fr)
ZA (1) ZA84349B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE8500193L (sv) * 1984-01-19 1985-07-20 Recycloplast Ag Forfarande for att blanda hellbara material med ett instellbart blandningsforhallande som en del av ett forfarande for att bearbeta materialen jemte anordning for att utfora forfarandet
DE3441382A1 (de) * 1984-11-13 1986-05-22 Deutsche Asphalt Gmbh, 6000 Frankfurt Verfahren und vorrichtung zum aufbereiten von asphalt
ATE32745T1 (de) * 1984-11-30 1988-03-15 Deutsche Asphalt Gmbh Verfahren zur herstellung von gussasphalt unter mitverwendung von asphaltbeton-recycling-material sowie nach diesem verfahren hergestellter gussasphalt.
FR2631354A1 (fr) * 1988-05-13 1989-11-17 Ermont Cm Dispositif et procede de preparation de produits bitumineux
US5251976A (en) * 1992-04-06 1993-10-12 Astec Industries, Inc. Asphalt plant adapted for the batch production of asphalt mix containing recycle asphalt paving
FR2862669A1 (fr) * 2003-11-21 2005-05-27 Famaro Dispositif de fourniture de granulats bitumineux recycles en quantite dosee a une installation de fabrication de produits bitumineux
CN106012764A (zh) * 2016-07-08 2016-10-12 山东省路桥集团有限公司 沥青厂拌热再生沥青铣刨料配料机
CN110158409B (zh) * 2019-06-12 2021-11-19 陈文� 一种高速公路沥青施工工具

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2365087A1 (de) * 1973-12-28 1975-07-03 Nielsen & Son Maskinfab As H Verfahren und anlage zur herstellung von steinhaltigen asphaltmaterialien, z.b. fuer strassendecken
AU3945478A (en) * 1977-09-02 1980-03-06 Pickermann O Asphalt production

Also Published As

Publication number Publication date
JPS59182855A (ja) 1984-10-17
DE3464939D1 (en) 1987-08-27
NZ206755A (en) 1986-12-05
CA1229082A (fr) 1987-11-10
AU2250183A (en) 1984-07-19
ATE28484T1 (de) 1987-08-15
ZA84349B (en) 1985-09-25
EP0114118A1 (fr) 1984-07-25

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