EP3243957B1 - Installation and process of gravel coating - Google Patents

Installation and process of gravel coating Download PDF

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Publication number
EP3243957B1
EP3243957B1 EP17170410.9A EP17170410A EP3243957B1 EP 3243957 B1 EP3243957 B1 EP 3243957B1 EP 17170410 A EP17170410 A EP 17170410A EP 3243957 B1 EP3243957 B1 EP 3243957B1
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EP
European Patent Office
Prior art keywords
drum
aggregates
aggregate
asphalt
gases
Prior art date
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Active
Application number
EP17170410.9A
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German (de)
French (fr)
Other versions
EP3243957A1 (en
EP3243957B2 (en
Inventor
Thierry De Sars
Hervé Riche
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Ermont
Original Assignee
Ermont
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Publication of EP3243957B1 publication Critical patent/EP3243957B1/en
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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
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1027—Mixing in a rotary receptacle
    • E01C19/1036—Mixing in a rotary receptacle for in-plant recycling or for reprocessing, e.g. adapted to receive and reprocess an addition of salvaged material, adapted to reheat and remix cooled-down batches
    • 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
    • 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
    • E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
    • E01C19/1068—Supplying or proportioning the ingredients
    • E01C19/1072—Supplying or proportioning the ingredients the solid ingredients
    • 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
    • E01C2019/1081—Details not otherwise provided for
    • E01C2019/109—Mixing containers having a counter flow drum, i.e. the flow of material is opposite to the gas flow
    • 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
    • E01C2019/1081—Details not otherwise provided for
    • E01C2019/1095—Mixing containers having a parallel flow drum, i.e. the flow of material is parallel to the gas flow

Definitions

  • the present invention relates to the field of coating aggregates facilities for the production of asphalt, including paving for road surfacing, with recycling asphalt aggregates.
  • the aggregates For the drying and heating of the aggregates, it is possible to introduce the aggregates into a dryer drum rotatably mounted about its central axis, the axis of the drum being inclined relative to the horizontal plane, and to circulate a flow of hot gas in the dryer drum to dry and heat the aggregates.
  • the fresh aggregates are introduced into the dryer drum at the raised end thereof, and the hot aggregates are recovered at the lowered end of the dryer drum.
  • the aggregates Due to the rotation of the drying drum, the aggregates are raised and fall back to form a curtain of aggregates inside the drying drum, the flow of hot gas passing through the curtain of aggregates.
  • the mixing of dry and hot aggregates with the binder is carried out in a kneading section of the drying drum, in which case the drying drum is called “drier-kneader” or in a separate external kneader and separated from the drying drum.
  • a co-current or counter-current dryer-mixer drum successively comprising, from its raised end toward its lowered end, a drying section for drying the aggregates, a section of mixture for mixing the aggregates and asphalt aggregates, asphalt aggregates being introduced into the mixing section, and a kneading section for kneading the mixture with a filler, the filler binder being introduced into the kneading section.
  • the hot gases circulating in the drying drum are generated by means of a burner disposed inside the drying drum, disposed near the raised end or the lowered end of the drying drum, depending on whether the latter is co-current or countercurrent.
  • the aggregates are superheated in the dryer drum to provide the amount of heat required for heating the asphalt aggregates in the kneading drum.
  • drying drum for drying aggregates and a drying drum for drying asphalt aggregates, aggregates and asphalt aggregates and filler binder being then introduced into a kneader separate from the drums. dryers.
  • the flow of hot gas circulating in the drying drum for the drying of the aggregates is generated by a burner disposed in this drying drum or by a hot gas generator comprising an enclosure and a burner for generating the hot gases, the enclosure being fluidly connected to the dryer drum to route the hot gases into the dryer drum.
  • the "recycling rate” is the ratio of the amount of asphalt aggregate to the sum of the amount of asphalt aggregate and the amount of fresh aggregate entering the mix.
  • GB2131314A discloses a asphalt recycling asphalt paving facility, comprising a first drum having a burner and fed with fresh aggregates and a second drum fed with hot aggregates from the first drum, recycled asphalt and binder hot gases passing from the first drum to the second drum.
  • EP0437990A discloses an asphalt recycling asphalt paving facility, comprising a first drum with a burner and fed with fresh recycled materials, and a second drum fed with fresh aggregates of hot recycled material from the first drum and by bonding hot gases passing from the first drum to the second drum.
  • One of the aims of the invention is to propose an aggregates coating plant that makes it possible to increase the recycling rate of asphalt aggregates in the production of asphalt mixes, in particular paving mixes.
  • the invention provides an aggregate coating plant according to claim 1.
  • the invention also relates to a method for coating aggregates according to claim 10.
  • the aggregate coating plant 2 of the Figure 1 is configured for asphalt mix asphalt mix production from fresh aggregates and fresh recycled asphalt aggregates.
  • freshness means that the aggregates or asphalt aggregates are wet and cold and have not yet been dried - completely or partially - in the aggregate coating plant 2.
  • the aggregate coating plant 2 comprises a first drying drum 4 by circulation of a gas flow in the first drum 4, and a second drying drum 6 by circulation of a gas flow in the second drum 6 , the first drum 4 being distinct from the second drum 6.
  • Each of the first drum 4 and the second drum 6 is rotatable.
  • Each of the first drum 4 and the second drum 6 extends along a respective central axis A1, A2, and each of the first drum 4 and the second drum 6 is rotatable around its central axis A1, A2.
  • each of the first drum 4 and the second drum 6 is inclined relative to the horizontal plane.
  • Each of the first drum 4 thus has a raised end 4A, 6A and a lowered end 4B, 6B.
  • the raised end 4A, 6A is located at a level higher than that of the lowered end 4B, 6B.
  • the aggregate coating plant 2 comprises a first feeder 7 configured to feed the raised end 4A of the first drum 4 in fresh G granulate.
  • the aggregate coating plant 2 comprises a second feed device 9 configured to feed the raised end 6A of the second drum 6 into fresh AE mixes.
  • the aggregates and / or asphalt aggregates present in the drum are raised due to the rotation of the drum and fall back to form a curtain of aggregates and / or of asphalt aggregates.
  • the gases circulating in the drum pass through the curtain of aggregates and / or asphalt aggregates, and dry the aggregates and / or asphalt aggregates,
  • the angle of inclination of the central axis A1, A2 of each of the first drum 4 and the second drum 6 relative to the horizontal plane is typically between 2 ° and 6 °.
  • the first drum 4 is a co-current dryer drum configured for a flow of gas in the direction of advancement of the aggregates. In operation, the gases flow from the raised end 4A towards the lowered end 4B of the first drum 4.
  • the second drum 6 is a co-current dryer drum, the gas flowing in the second drum 6 in the direction of advance of the asphalt aggregates. In operation, the gases flow from the raised end 6A towards the lowered end 6B of the second drum 6.
  • the aggregate coating plant 2 comprises a burner 8 to form a flame F and heat the gases flowing in the first drum 4.
  • the burner 8 is disposed inside the first drum 4, close to the raised end 4A of the first drum 4, to heat the gases entering the first drum 4 by its raised end 4A and flowing towards its lowered end 4B .
  • the second drum 6 is fluidly connected in series with the first drum 4 so as to feed the second drum 6 with gases that have already circulated in the first drum 4.
  • the second drum 6 is here fluidly connected to the first drum 4 by a supply connection 10 so as to feed the second drum 6 with gases having circulated in the first drum 4.
  • the supply link 10 extends here between the lowered end 4B of the first drum 4 and the raised end 6A of the second drum 6, to feed the second drum 4 with the gases leaving the first drum 4.
  • the aggregate coating plant 2 is configured to feed the second drum 6 with at least a fraction of the gases leaving the first drum 4.
  • the aggregate coating plant 2 can be configured to feed the second drum 6 with a fraction of the gases leaving the first drum 4 or with all the gases leaving the first drum 4.
  • the second drum 6 is supplied with hot gas only by gases that have already circulated in the first drum 4.
  • the second drum 6 is in particular devoid of burner 8.
  • the gases circulate in the first drum 4 by being heated initially to a first temperature T1, and are introduced into the second drum 6 at a second temperature T2 strictly lower than the first temperature T1.
  • the gases are initially heated to the first temperature T1 by the burner 8, and then progressively cool while circulating in the first drum 4, and are therefore introduced into the second drum 6 at a second temperature T2 strictly lower than the first temperature T1 .
  • the aggregate coating plant 2 is also configured for feeding the second drum 6 with the heated aggregates leaving the first drum 4.
  • the aggregates heated in the first drum 4 are introduced into the second drum 6 at the end. raised 6A thereof, with asphalt aggregates.
  • the aggregate coating plant 2 here comprises a transfer device 11 for transferring the aggregates from the lowered end of the first drum to the raised end of the second drum 6.
  • the raised end 6A of the second drum 6 is fed asphalt aggregates and aggregates leaving the first drum 4, and the second drum 6 mixes the asphalt aggregates and heated aggregates.
  • the heat of the aggregates heated in the first drum 4 allows part of drying the asphalt aggregates in the second drum.
  • the asphalt aggregates are dried in the second drum 6 by the gases leaving the first drum 4 and by the aggregates previously heated in the first drum 4.
  • the aggregate coating plant 2 comprises a kneader 12 for kneading the mixture M of aggregates and asphalt aggregates exiting the second drum 6, at the lowered end 6B thereof.
  • binder from asphalt aggregates. It may be necessary to also provide additional binder, called “binder”.
  • the aggregate coating plant 2 comprises a feed binder supply device 14 for introducing feed binder into the mixer 12.
  • the aggregate coating plant 2 comprises a recirculation circuit 16 for recovering at least a fraction of the gases leaving the second drum 6 and reintroducing these gases into the first drum 4.
  • the recirculation circuit 16 is here configured to recover gases at the lowered end 6B of the second drum 4 and to reinject the high end 4A of the first drum 4.
  • Such a recirculation of the gases makes it possible to simply adjust the temperature of the gases in the first drum 4, for example by varying the fraction of the recycled gases coming from the second drum 6.
  • the aggregate coating plant 2 comprises a filtering device 18 fluidly connected to the second drum 6 for filtering at least a fraction of the gases leaving the second drum 6.
  • the filtering device 18 is for example a bag filter.
  • the filtering device 18 is here fluidly connected to the lowered end 6B of the second drum 4 by a filtering link 20.
  • the aggregate coating plant 2 comprises an emission recovery circuit 22 for recovering emissions emitted in the mixer 12 and injecting them into the gases upstream of the burner 8, in order to incinerate these emissions in the flame F of the burner 8 Emissions are emitted by the binder or the recycling binder during mixing.
  • the emission recovery circuit 22 opens here into the recirculation circuit 16, so as to reinject the emissions 22 with the gases reinjected into the first drum 4.
  • the emission recovery circuit 22 is separated from the transmission circuit. recirculation 16 and opens into the first drum 4.
  • the first drum 4 and the second drum 6 are separate rotatable about their respective central axes A1, A2 at different speeds of rotation of each other.
  • the rotational speed of the first drum 4 is adjustable with respect to the speed of rotation of the second drum 6.
  • the rotational speed of the first drum 4 can take several different values for the same speed of rotation of the second drum 6.
  • the aggregate coating plant 2 comprises a common drive device for driving in rotation the first drum 4 and the second drum 6, the first drum 4 and the second drum 6 being coupled to the common drive respectively by a first mechanical transmission and a second mechanical transmission, at least the first mechanical transmission having a plurality of selectable transmission ratios.
  • the speed of rotation of the first drum 4 is adjustable independently of the speed of rotation of the second drum 6.
  • the aggregate coating plant 2 comprises a first drive device 24 for driving in rotation the first drum, and a second drive device 26 for driving in rotation the second drum, the second the drive 24 being separate from the first drive motor 26.
  • the first drive device 24 and the second drive device 26 are adjustable independently of each other for adjusting the rotational speed of the first drum 4 regardless of the speed of rotation of the second drum 6.
  • Each drive device is configured to generate a rotational drive torque.
  • Each drive device comprises for example a motor or a series of motors.
  • the adjustment of the speed of rotation of the first drum 4 makes it possible to adjust the temperature of the heating gases leaving the first drum 4.
  • the variation of the speed of the drum makes it possible to vary the density of the curtain of materials and the speed progress of materials.
  • the aggregates are dried and heated by the hot gases in the first drum 4.
  • the hot gases generated by the burner 8 are heated to a high temperature (first temperature T1) and leave the first drum 4 at a moderate temperature (Second temperature T2) due to a first heat exchange with the aggregates.
  • the asphalt aggregates are dried and heated in the second drum 6 fed with the gases at moderate temperature (second temperature T2) coming out of the first drum 4, while being mixed with the aggregates previously heated in the first drum 4.
  • the binder The feed is mixed with the aggregates and asphalt aggregates in the mixer 12.
  • This aggregate coating plant 2 allows a very high recycling rate, including a recycling rate equal to or greater than 50%.
  • the asphalt aggregates are not subjected to the radiation of the flame F of the burner 8 and are not in contact with very high temperature gases generated by the burner 8.
  • the mixing, in the second drum 6, asphalt aggregates with the hot aggregates leaving the first drum 4 provides part of the heat required for drying asphalt aggregates through the aggregates and further limits the power required for heating asphalt aggregates.
  • Adjusting the temperature of the gases leaving the first drum 4 and supplying the second drum 6 for drying the asphalt aggregates makes it possible to supply the second drum 6 with gases having a temperature suitable for a recycling of aggregates. coated with a high recycling rate.
  • the aggregate coating plant 2 comprises a single burner, which limits its manufacturing, operating and maintenance costs.
  • the separate mixer 12 can be sanitized and the emissions can be incinerated in the flame F of the burner 8.
  • the embodiment of the Figure 2 differs from that of the Figure 1 in that the second drum 6 is countercurrent. It is configured for the gases to flow from the lowered end 6B to the raised end 6A.
  • the lowered end 6B of the second drum 6 is fluidly connected to the lowered end 4B of the first drum 4 for feeding the lowered end 6B of the second drum 6 with the gases exiting at the lowered end 6B of the first drum 4 .
  • the embodiment of the Figure 3 differs from that of the Figure 1 in that the second drum 6 is a drying drum and kneader or "drier-kneader".
  • the aggregate coating plant 2 is here devoid of separate mixer.
  • the second drum 6 successively comprises, from its raised end 6A towards its lowered end 6B, a drying section 30 and a kneading section 32.
  • the feed binder supply device 14 is arranged to introduce the feed binder. inside the second drum 6, in the mixing section 32.
  • the first drum 4 is co-current.
  • the first drum 4 is against the current, the gas flowing in the first drum 4 in opposite directions of the direction of advance of the aggregates.
  • the burner 8 is disposed inside the first drum 4 near the lowered end 4B of the first drum 4.
  • the end of the first drum 4 through which the gases exit is fluidly connected to the end of the second drum 6 through which the gases are introduced into the second drum 6, so as to feed the second drum with at least one fraction of gases leaving the first drum 4.
  • the second drum 6 is supplied with gas only with the gases leaving the first drum 4.
  • the burner 8 is disposed inside the first drum.
  • the aggregate coating plant 2 comprises a separate combustion chamber and separated from the first drum, the burner being disposed within the combustion chamber, the combustion chamber being fluidly connected to the first drum to circulate the hot gases in the first drum.
  • the combustion chamber is fluidly connected to the raised end of the first drum or to the lowered end of the first drum depending on whether the first drum is co-current or countercurrent.
  • the gas recirculation circuit 16 is configured to reinject the gases taken at the outlet of the second drum into the combustion chamber and / or into the first drum at the end of the first drum 4. which hot gases are introduced into the first drum 4.
  • the emission recovery circuit is configured to reinject the emissions into the combustion chamber for incineration in the flame F of the burner 8.
  • the emission recovery circuit is configured for the reinjection of the emissions into the gases upstream of the burner 8 for the incineration of the emissions in the flame F of the burner 8.
  • hot aggregates coming out of the first drum 4 are introduced into the second drum 6 directly into an intermediate section of the second drum 6, situated at a distance from the raised end 6A of the second drum 6.
  • the aggregate coating plant 2 comprises for example an insertion ring 34 disposed on the second drum 6 at a distance from the raised end 6A of the second drum 6, and connected to the lowered end 4B of the first drum 4 to receive the hot aggregates coming out of the first drum 4.
  • fresh aggregates feed the raised end 6A of the second drum 6.
  • the aggregate coating plant 2 comprises an auxiliary supply device 36 for introducing fresh aggregates into the raised end 6A of the second drum 6.
  • fresh aggregates are introduced into the second drum 6 directly into an intermediate portion of the second drum 6, located at a distance from the raised end 6A of the second drum 6.
  • the aggregate coating plant 2 optionally comprises a fresh aggregate introduction device 38 for introducing fresh aggregates into the second drum 6 directly into an intermediate section of the second drum 6, located at a distance from the raised end. 6A of the second drum 6, for example via an insertion ring 34.
  • the fresh aggregates are introduced into the first drum 4 and / or directly into the second drum 6.
  • At least a fraction of the fresh aggregates is introduced into the first drum 4 at its raised end 4A.
  • This fraction is preferably a major fraction, representing at least 50% of the amount of fresh aggregate, more preferably at least 80% of the amount of fresh aggregate.
  • all the fresh aggregates are introduced into the first drum 4 at its raised end 4A.
  • hot aggregates leaving the first drum 4 are introduced directly into the mixer 12 without passing through the second drum 6.
  • the aggregate coating plant 2 comprises, for example, an auxiliary transfer device 40 for transferring aggregates directly from the lowered end 4B of the first drum 4 to the mixer 12 without passing through the second drum 6.
  • At least a fraction of the fresh asphalt aggregates is introduced into the second drum 6 for drying by circulation of gas that has already circulated in the first drum 6.
  • the fraction of the fresh mixes introduced into the second drum 6 is a majority fraction of the fresh mixes aggregates, representing at least 50% of the quantity of fresh asphalt aggregates, preferably at least 80% the quantity of fresh asphalt aggregates, and in a particular embodiment, all the fresh asphalt aggregates.
  • the kneader 12 is a continuous kneader which continuously receives and processes aggregates and asphalt aggregates.
  • the kneader 12 is a batch kneader which processes aggregates and asphalt aggregates by successive drills.
  • the aggregate coating plant 2 comprises a storage device disposed between the second drum 6 and the mixer 12 for temporarily storing aggregates and aggregates of hot mix, before supplying them to the mixer 12.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)

Description

La présente invention concerne le domaine des installations d'enrobage de granulats pour la production d'enrobés, notamment d'enrobés pour revêtement routier, avec recyclage d'agrégats d'enrobés.The present invention relates to the field of coating aggregates facilities for the production of asphalt, including paving for road surfacing, with recycling asphalt aggregates.

Pour produire des enrobés pour revêtement routier, il est possible de sécher et chauffer des granulats, puis de malaxer les granulats secs et chauds avec du liant, notamment un liant bitumineux, pour produire un enrobé de revêtement routier.To produce road paving mixes, it is possible to dry and heat aggregates and then mix the dry and hot aggregates with binder, including an asphalt binder, to produce asphalt paving.

Pour le séchage et le chauffage des granulats, il est possible d'introduire les granulats dans un tambour de sécheur monté rotatif autour de son axe central, l'axe du tambour étant incliné par rapport au plan horizontal, et de faire circuler un flux de gaz chaud dans le tambour sécheur pour sécher et chauffer les granulats.For the drying and heating of the aggregates, it is possible to introduce the aggregates into a dryer drum rotatably mounted about its central axis, the axis of the drum being inclined relative to the horizontal plane, and to circulate a flow of hot gas in the dryer drum to dry and heat the aggregates.

Les granulats frais sont introduits dans le tambour sécheur à l'extrémité relevée de celui-ci, et les granulats chauds sont récupérés à l'extrémité abaissée du tambour sécheur.The fresh aggregates are introduced into the dryer drum at the raised end thereof, and the hot aggregates are recovered at the lowered end of the dryer drum.

Du fait de la rotation du tambour sécheur, les granulats sont relevés et retombent en formant un rideau de granulats à l'intérieur du tambour sécheur, le flux de gaz chaud traversant le rideau de granulats.Due to the rotation of the drying drum, the aggregates are raised and fall back to form a curtain of aggregates inside the drying drum, the flow of hot gas passing through the curtain of aggregates.

Du fait de l'inclinaison du tambour sécheur, les granulats introduits par l'extrémité relevée du tambour sécheur avancent progressivement vers l'extrémité abaissée du tambour sécheur.Due to the inclination of the drying drum, the aggregates introduced by the raised end of the drying drum progressively advance towards the lowered end of the drying drum.

Dans un tambour sécheur à « co-courants » ou à « courants parallèles », le flux de gaz circule dans le tambour sécheur dans le sens d'avancement des granulats, i.e. de l'extrémité relevée vers l'extrémité abaissée.In a "co-current" or "parallel flow" dryer drum, the flow of gas flows through the dryer drum in the direction of travel of the aggregates, i.e. from the raised end to the lowered end.

Dans un tambour sécheur à « contre-courant », le flux de gaz circule dans le tambour sécheur en sens opposé du sens d'avancement des granulats, i.e. de l'extrémité abaissée vers l'extrémité relevée.In a "countercurrent" drying drum, the flow of gas flows in the drying drum in the direction opposite to the direction of travel of the aggregates, i.e. from the end lowered towards the raised end.

Le malaxage de granulats sec et chaud avec le liant est réalisé dans un tronçon de malaxage du tambour sécheur, auquel cas le tambour sécheur est dit « sécheur-malaxeur » ou dans un malaxeur externe distinct et séparé du tambour sécheur.The mixing of dry and hot aggregates with the binder is carried out in a kneading section of the drying drum, in which case the drying drum is called "drier-kneader" or in a separate external kneader and separated from the drying drum.

Avantageusement, il est possible de mélanger les granulats avec des « agrégats d'enrobés » provenant du recyclage d'enrobés.Advantageously, it is possible to mix the aggregates with "asphalt aggregates" resulting from the recycle of mixes.

Pour ce faire, il est possible de prévoir un tambour sécheur-malaxeur à co-courant ou à contre-courant comprenant successivement depuis son extrémité relevée vers son extrémité abaissée, un tronçon de séchage pour sécher les granulats, un tronçon de mélange pour mélanger les granulats et les agrégats d'enrobé, les agrégats d'enrobé étant introduits dans le tronçon de mélange, et un tronçon de malaxage pour malaxer le mélange avec un liant d'apport, le liant d'apport étant introduit dans le tronçon de malaxage.To do this, it is possible to provide a co-current or counter-current dryer-mixer drum successively comprising, from its raised end toward its lowered end, a drying section for drying the aggregates, a section of mixture for mixing the aggregates and asphalt aggregates, asphalt aggregates being introduced into the mixing section, and a kneading section for kneading the mixture with a filler, the filler binder being introduced into the kneading section.

Les gaz chaud circulant dans le tambour sécheur sont générés à l'aide d'un brûleur disposé à l'intérieur du tambour sécheur, disposé à proximité de l'extrémité relevée ou de l'extrémité abaissée du tambour sécheur, selon que ce dernier est à co-courant ou à contre-courant.The hot gases circulating in the drying drum are generated by means of a burner disposed inside the drying drum, disposed near the raised end or the lowered end of the drying drum, depending on whether the latter is co-current or countercurrent.

Il est aussi possible de prévoir un tambour sécheur et un malaxeur externe, les granulats étant chauffés dans le tambour sécheur, et les agrégats d'enrobé et le liant d'apport étant introduits dans le malaxeur. Les granulats sont surchauffés dans le tambour sécheur afin de fournir la quantité de chaleur nécessaire pour le chauffage des agrégats d'enrobés.It is also possible to provide a drying drum and an external kneader, the aggregates being heated in the drying drum, and the asphalt aggregates and the filler binder being introduced into the kneader. The aggregates are superheated in the dryer drum to provide the amount of heat required for heating the asphalt aggregates.

Il est aussi possible de prévoir un tambour sécheur pour le séchage des granulats, et un tambour malaxeur distinct du tambour sécheur, les granulats et les agrégats et le liant d'apport étant introduits dans le tambour malaxeur. Les granulats sont surchauffés dans le tambour sécheur afin de fournir la quantité de chaleur nécessaire pour le chauffage des agrégats d'enrobés dans le tambour malaxeur.It is also possible to provide a drying drum for drying the aggregates, and a mixing drum separate from the drying drum, the aggregates and aggregates and the binder being introduced into the kneading drum. The aggregates are superheated in the dryer drum to provide the amount of heat required for heating the asphalt aggregates in the kneading drum.

Il est encore possible de prévoir un tambour sécheur pour le séchage des granulats et un tambour sécheur pour le séchage des agrégats d'enrobés, les granulats et les agrégats d'enrobé et du liant d'apport étant ensuite introduits dans un malaxeur distinct des tambours sécheurs. Le flux de gaz chaud circulant dans le tambour sécheur pour le séchage des granulats est généré par un brûleur disposé dans ce tambour sécheur ou par un générateur de gaz chaud comprenant une enceinte et un brûleur pour générer les gaz chaud, l'enceinte étant reliée fluidiquement au tambour sécheur pour acheminer les gaz chaud dans le tambour sécheur.It is still possible to provide a drying drum for drying aggregates and a drying drum for drying asphalt aggregates, aggregates and asphalt aggregates and filler binder being then introduced into a kneader separate from the drums. dryers. The flow of hot gas circulating in the drying drum for the drying of the aggregates is generated by a burner disposed in this drying drum or by a hot gas generator comprising an enclosure and a burner for generating the hot gases, the enclosure being fluidly connected to the dryer drum to route the hot gases into the dryer drum.

Pour un enrobé, le « taux de recyclage » est le ratio de la quantité d'agrégats d'enrobé sur la somme de la quantité d'agrégat d'enrobé et de la quantité de granulats frais entrant dans la composition de l'enrobé.For a mix, the "recycling rate" is the ratio of the amount of asphalt aggregate to the sum of the amount of asphalt aggregate and the amount of fresh aggregate entering the mix.

Pour la production d'enrobés avec recyclage d'agrégats d'enrobé, il est souhaitable d'atteindre un taux de recyclage élevée, pour augmenter le recyclage des agrégats d'enrobé et limiter la quantité de granulats neuf utilisée.For asphalt mix asphalt mix production, it is desirable to achieve a high recycling rate, to increase the recycling of asphalt aggregates and to limit the amount of new aggregates used.

GB2131314A divulgue une installation de production d'enrobés pour revêtement routier avec recyclage d'asphalte, comprenant un premier tambour muni d'un brûleur et alimenté en granulats frais et un deuxième tambour alimenté en granulats chauds provenant du premier tambour, en asphalte recyclé et en liant, des gaz chaud passant du premier tambour au deuxième tambour. GB2131314A discloses a asphalt recycling asphalt paving facility, comprising a first drum having a burner and fed with fresh aggregates and a second drum fed with hot aggregates from the first drum, recycled asphalt and binder hot gases passing from the first drum to the second drum.

EP0437990A divulgue une installation de production d'enrobés pour revêtement routier avec recyclage d'asphalte, comprenant un premier tambour muni d'un brûleur et alimenté en matériaux recyclés frais, et un deuxième tambour alimenté en granulats frais, en matériaux recyclés chauds provenant du premier tambour et en liant, des gaz chaud passant du premier tambour au deuxième tambour. EP0437990A discloses an asphalt recycling asphalt paving facility, comprising a first drum with a burner and fed with fresh recycled materials, and a second drum fed with fresh aggregates of hot recycled material from the first drum and by bonding hot gases passing from the first drum to the second drum.

Un des buts de l'invention est de proposer une installation d'enrobage de granulats permettant d'augmenter le taux de recyclage des agrégats d'enrobé dans la production d'enrobés, notamment d'enrobés pour revêtement routier.One of the aims of the invention is to propose an aggregates coating plant that makes it possible to increase the recycling rate of asphalt aggregates in the production of asphalt mixes, in particular paving mixes.

A cet effet, l'invention propose une installation d'enrobage de granulats selon la revendication 1.For this purpose, the invention provides an aggregate coating plant according to claim 1.

Des caractéristiques optionnelles sont définies aux revendications 2 à 9.Optional features are defined in claims 2 to 9.

L'invention concerne également un procédé d'enrobage de granulats selon la revendication 10.The invention also relates to a method for coating aggregates according to claim 10.

L'invention et ses avantages seront mieux compris à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en référence aux dessins annexés, sur lesquels les Figures 1 à 3 sont des vues d'ensemble schématiques d'installations d'enrobage de granulats selon différents modes de réalisation.The invention and its advantages will be better understood on reading the description which follows, given solely by way of example and with reference to the appended drawings, in which the Figures 1 to 3 are schematic overviews of aggregate coating plants according to different embodiments.

L'installation d'enrobage de granulats 2 de la Figure 1 est configurée pour la production d'enrobé avec recyclage d'agrégat d'enrobé, à partir de granulats frais et d'agrégats d'enrobé frais recyclés.The aggregate coating plant 2 of the Figure 1 is configured for asphalt mix asphalt mix production from fresh aggregates and fresh recycled asphalt aggregates.

Dans la présente demande, le terme « frais » signifie que les granulats ou les agrégats d'enrobé sont humides et froids et n'ont pas encore été séchés - complètement ou partiellement - dans l'installation d'enrobage de granulats 2.In the present application, the term "fresh" means that the aggregates or asphalt aggregates are wet and cold and have not yet been dried - completely or partially - in the aggregate coating plant 2.

L'installation d'enrobage de granulats 2 comprend un premier tambour 4 de séchage par circulation d'un flux de gaz dans le premier tambour 4, et un deuxième tambour 6 de séchage par circulation d'un flux de gaz dans le deuxième tambour 6, le premier tambour 4 étant distinct du deuxième tambour 6.The aggregate coating plant 2 comprises a first drying drum 4 by circulation of a gas flow in the first drum 4, and a second drying drum 6 by circulation of a gas flow in the second drum 6 , the first drum 4 being distinct from the second drum 6.

Chacun du premier tambour 4 et du deuxième tambour 6 est rotatif. Chacun du premier tambour 4 et du deuxième tambour 6 s'étend suivant un axe central A1, A2 respectif, et chacun du premier tambour 4 et du deuxième tambour 6 est rotatif autour de son axe central A1, A2.Each of the first drum 4 and the second drum 6 is rotatable. Each of the first drum 4 and the second drum 6 extends along a respective central axis A1, A2, and each of the first drum 4 and the second drum 6 is rotatable around its central axis A1, A2.

L'axe central A1, A2 de chacun du premier tambour 4 et du deuxième tambour 6 est incliné par rapport au plan horizontal. Chacun du premier tambour 4 possède donc une extrémité relevée 4A, 6A et une extrémité abaissée 4B, 6B. L'extrémité relevée 4A, 6A est située à un niveau supérieur à celui de l'extrémité abaissée 4B, 6B.The central axis A1, A2 of each of the first drum 4 and the second drum 6 is inclined relative to the horizontal plane. Each of the first drum 4 thus has a raised end 4A, 6A and a lowered end 4B, 6B. The raised end 4A, 6A is located at a level higher than that of the lowered end 4B, 6B.

L'installation d'enrobage de granulats 2 comprend un premier dispositif d'alimentation 7 configuré pour alimenter l'extrémité relevée 4A du premier tambour 4 en granulats G frais.The aggregate coating plant 2 comprises a first feeder 7 configured to feed the raised end 4A of the first drum 4 in fresh G granulate.

L'installation d'enrobage de granulats 2 comprend un deuxième dispositif d'alimentation 9 configuré pour alimenter l'extrémité relevée 6A du deuxième tambour 6 en agrégats d'enrobés AE frais.The aggregate coating plant 2 comprises a second feed device 9 configured to feed the raised end 6A of the second drum 6 into fresh AE mixes.

Lors de la rotation de chacun du premier tambour 4 et du deuxième tambour 6, les granulats et/ou les agrégats d'enrobé présents dans le tambour sont relevés du fait de la rotation du tambour et retombent en formant un rideau de granulats et/ou d'agrégats d'enrobé. Les gaz circulant dans le tambour traversent le rideau de granulats et/ou d'agrégats d'enrobé, et sèchent les granulats et/ou les agrégats d'enrobé,During the rotation of each of the first drum 4 and the second drum 6, the aggregates and / or asphalt aggregates present in the drum are raised due to the rotation of the drum and fall back to form a curtain of aggregates and / or of asphalt aggregates. The gases circulating in the drum pass through the curtain of aggregates and / or asphalt aggregates, and dry the aggregates and / or asphalt aggregates,

Lors de la rotation de chacun du premier tambour 4 et du deuxième tambour 6, du fait de l'inclinaison de l'axe central A1, A2, les granulats et/ou les agrégats d'enrobés présents dans le tambour avancent progressivement de l'extrémité relevée 4A, 6A vers l'extrémité abaissée 4B, 6B du tambour.During the rotation of each of the first drum 4 and the second drum 6, because of the inclination of the central axis A1, A2, the aggregates and / or asphalt aggregates present in the drum progressively advance from the raised end 4A, 6A towards the lowered end 4B, 6B of the drum.

L'angle d'inclinaison de l'axe centrale A1, A2 de chacun du premier tambour 4 et du deuxième tambour 6 par rapport au plan horizontal est typiquement compris entre 2° et 6°.The angle of inclination of the central axis A1, A2 of each of the first drum 4 and the second drum 6 relative to the horizontal plane is typically between 2 ° and 6 °.

Le premier tambour 4 est un tambour sécheur à co-courant configuré pour une circulation des gaz dans le sens d'avancement des granulats. En fonctionnement, les gaz circulent de l'extrémité relevée 4A vers l'extrémité abaissée 4B du premier tambour 4.The first drum 4 is a co-current dryer drum configured for a flow of gas in the direction of advancement of the aggregates. In operation, the gases flow from the raised end 4A towards the lowered end 4B of the first drum 4.

Le deuxième tambour 6 est un tambour sécheur à co-courant, le gaz circulant dans le deuxième tambour 6 dans le sens d'avancement des agrégats d'enrobé. En fonctionnement, les gaz circulent de l'extrémité relevée 6A vers l'extrémité abaissée 6B du deuxième tambour 6.The second drum 6 is a co-current dryer drum, the gas flowing in the second drum 6 in the direction of advance of the asphalt aggregates. In operation, the gases flow from the raised end 6A towards the lowered end 6B of the second drum 6.

L'installation d'enrobage de granulats 2 comprend un brûleur 8 pour former une flamme F et chauffer les gaz circulant dans le premier tambour 4.The aggregate coating plant 2 comprises a burner 8 to form a flame F and heat the gases flowing in the first drum 4.

Sur la Figure 1, le brûleur 8 est disposé à l'intérieur du premier tambour 4, à proximité de l'extrémité relevée 4A du premier tambour 4, pour chauffer les gaz entrant dans le premier tambour 4 par son extrémité relevée 4A et circulant vers son extrémité abaissée 4B.On the Figure 1 , the burner 8 is disposed inside the first drum 4, close to the raised end 4A of the first drum 4, to heat the gases entering the first drum 4 by its raised end 4A and flowing towards its lowered end 4B .

Le deuxième tambour 6 est relié fluidiquement en série avec le premier tambour 4 de façon à alimenter le deuxième tambour 6 avec des gaz ayant déjà circulé dans le premier tambour 4.The second drum 6 is fluidly connected in series with the first drum 4 so as to feed the second drum 6 with gases that have already circulated in the first drum 4.

Le deuxième tambour 6 est ici relié fluidiquement au premier tambour 4 par une liaison d'alimentation 10 de façon à alimenter le deuxième tambour 6 avec des gaz ayant circulé dans le premier tambour 4.The second drum 6 is here fluidly connected to the first drum 4 by a supply connection 10 so as to feed the second drum 6 with gases having circulated in the first drum 4.

La liaison d'alimentation 10 s'étend ici entre l'extrémité abaissée 4B du premier tambour 4 et l'extrémité relevée 6A du deuxième tambour 6, pour alimenter le deuxième tambour 4 avec les gaz sortant du premier tambour 4.The supply link 10 extends here between the lowered end 4B of the first drum 4 and the raised end 6A of the second drum 6, to feed the second drum 4 with the gases leaving the first drum 4.

L'installation d'enrobage de granulats 2 est configurée pour alimenter le deuxième tambour 6 avec au moins une fraction des gaz sortant du premier tambour 4. L'installation d'enrobage de granulats 2 peut être configurée pour alimenter le deuxième tambour 6 avec une fraction des gaz sortant du premier tambour 4 ou avec la totalité des gaz sortant du premier tambour 4.The aggregate coating plant 2 is configured to feed the second drum 6 with at least a fraction of the gases leaving the first drum 4. The aggregate coating plant 2 can be configured to feed the second drum 6 with a fraction of the gases leaving the first drum 4 or with all the gases leaving the first drum 4.

Le deuxième tambour 6 est alimenté en gaz chaud uniquement par des gaz ayant déjà circulé dans le premier tambour 4. Le deuxième tambour 6 est notamment dépourvu de brûleur 8.The second drum 6 is supplied with hot gas only by gases that have already circulated in the first drum 4. The second drum 6 is in particular devoid of burner 8.

En fonctionnement, les gaz circulent dans le premier tambour 4 en étant chauffés initialement jusqu'une première température T1, et sont introduits dans le deuxième tambour 6 à une deuxième température T2 strictement inférieur à la première température T1.In operation, the gases circulate in the first drum 4 by being heated initially to a first temperature T1, and are introduced into the second drum 6 at a second temperature T2 strictly lower than the first temperature T1.

En effet, les gaz sont chauffés initialement à la première température T1 par le brûleur 8, puis refroidissent progressivement en circulant dans le premier tambour 4, et sont donc introduits dans le deuxième tambour 6 à une deuxième température T2 strictement inférieur à la première température T1.Indeed, the gases are initially heated to the first temperature T1 by the burner 8, and then progressively cool while circulating in the first drum 4, and are therefore introduced into the second drum 6 at a second temperature T2 strictly lower than the first temperature T1 .

L'installation d'enrobage de granulats 2 est également configurée pour l'alimentation du deuxième tambour 6 avec les granulats chauffés sortant du premier tambour 4. Les granulats chauffés dans le premier tambour 4 sont introduits dans le deuxième tambour 6, à l'extrémité relevée 6A de celui-ci, avec les agrégats d'enrobé.The aggregate coating plant 2 is also configured for feeding the second drum 6 with the heated aggregates leaving the first drum 4. The aggregates heated in the first drum 4 are introduced into the second drum 6 at the end. raised 6A thereof, with asphalt aggregates.

L'installation d'enrobage de granulats 2 comprend ici un dispositif de transfert 11 pour transférer les granulats de l'extrémité abaissée du premier tambour à l'extrémité relevée du deuxième tambour 6.The aggregate coating plant 2 here comprises a transfer device 11 for transferring the aggregates from the lowered end of the first drum to the raised end of the second drum 6.

Ainsi, en fonctionnement, l'extrémité relevée 6A du deuxième tambour 6 est alimentée les agrégats d'enrobé et les granulats sortant du premier tambour 4, et le deuxième tambour 6 mélange les agrégats d'enrobé et les granulats chauffés. La chaleur des granulats chauffés dans le premier tambour 4 permet en partie de sécher les agrégats d'enrobé dans le deuxième tambour. Les agrégats d'enrobé sont séchés dans le deuxième tambour 6 par les gaz sortant du premier tambour 4 et par les granulats préalablement chauffés dans le premier tambour 4.Thus, in operation, the raised end 6A of the second drum 6 is fed asphalt aggregates and aggregates leaving the first drum 4, and the second drum 6 mixes the asphalt aggregates and heated aggregates. The heat of the aggregates heated in the first drum 4 allows part of drying the asphalt aggregates in the second drum. The asphalt aggregates are dried in the second drum 6 by the gases leaving the first drum 4 and by the aggregates previously heated in the first drum 4.

L'installation d'enrobage de granulats 2 comprend un malaxeur 12 pour malaxer le mélange M de granulats et d'agrégats d'enrobés sortant du deuxième tambour 6, à l'extrémité abaissée 6B de celui-ci.The aggregate coating plant 2 comprises a kneader 12 for kneading the mixture M of aggregates and asphalt aggregates exiting the second drum 6, at the lowered end 6B thereof.

Les agrégats d'enrobé mélangés aux granulats contiennent déjà du liant, dit « liant de recyclage », provenant des agrégats d'enrobé. Il peut s'avérer nécessaire d'apporter également du liant supplémentaire, dit « liant d'apport ».Mixed aggregates mixed with aggregates already contain binder, called "recycling binder", from asphalt aggregates. It may be necessary to also provide additional binder, called "binder".

L'installation d'enrobage de granulats 2 comprend un dispositif d'alimentation en liant d'apport 14 pour introduire du liant d'apport dans le malaxeur 12.The aggregate coating plant 2 comprises a feed binder supply device 14 for introducing feed binder into the mixer 12.

En option, l'installation d'enrobage de granulats 2 comprend un circuit de recirculation 16 pour récupérer au moins une fraction des gaz sortant du deuxième tambour 6 et réintroduire ces gaz dans le premier tambour 4.Optionally, the aggregate coating plant 2 comprises a recirculation circuit 16 for recovering at least a fraction of the gases leaving the second drum 6 and reintroducing these gases into the first drum 4.

Le circuit de recirculation 16 est ici configuré pour récupérer des gaz à l'extrémité abaissée 6B du deuxième tambour 4 et pour les réinjecter l'extrémité élevée 4A du premier tambour 4.The recirculation circuit 16 is here configured to recover gases at the lowered end 6B of the second drum 4 and to reinject the high end 4A of the first drum 4.

Une telle recirculation des gaz permet d'ajuster simplement la température des gaz dans le premier tambour 4, par exemple en faisant varier la fraction des gaz recyclés provenant du deuxième tambour 6.Such a recirculation of the gases makes it possible to simply adjust the temperature of the gases in the first drum 4, for example by varying the fraction of the recycled gases coming from the second drum 6.

L'installation d'enrobage de granulats 2 comprend un dispositif de filtrage 18 relié fluidiquement au deuxième tambour 6 pour filtrer au moins une fraction des gaz sortant du deuxième tambour 6. Le dispositif de filtrage 18 est par exemple un filtre à manches.The aggregate coating plant 2 comprises a filtering device 18 fluidly connected to the second drum 6 for filtering at least a fraction of the gases leaving the second drum 6. The filtering device 18 is for example a bag filter.

Le dispositif de filtrage 18 est ici relié fluidiquement à l'extrémité abaissée 6B du deuxième tambour 4 par une liaison de filtrage 20.The filtering device 18 is here fluidly connected to the lowered end 6B of the second drum 4 by a filtering link 20.

L'installation d'enrobage de granulats 2 comprend un circuit de récupération d'émissions 22 pour récupérer des émissions émises dans le malaxeur 12 et les injecter dans les gaz en amont du brûleur 8, pour incinérer ces émissions dans la flamme F du brûleur 8. Les émissions sont émises par le liant d'apport ou le liant de recyclage lors du malaxage.The aggregate coating plant 2 comprises an emission recovery circuit 22 for recovering emissions emitted in the mixer 12 and injecting them into the gases upstream of the burner 8, in order to incinerate these emissions in the flame F of the burner 8 Emissions are emitted by the binder or the recycling binder during mixing.

Le circuit de récupération d'émissions 22 débouche ici dans le circuit de recirculation 16, de façon à réinjecter les émissions 22 avec les gaz réinjectés dans le premier tambour 4. En variante, le circuit de récupération d'émissions 22 est séparé du circuit de recirculation 16 et débouche dans le premier tambour 4.The emission recovery circuit 22 opens here into the recirculation circuit 16, so as to reinject the emissions 22 with the gases reinjected into the first drum 4. In a variant, the emission recovery circuit 22 is separated from the transmission circuit. recirculation 16 and opens into the first drum 4.

Le premier tambour 4 et le deuxième tambour 6 distincts sont propres à tourner autour de leurs axes centraux A1, A2 respectifs à des vitesses de rotation différentes l'une de l'autre.The first drum 4 and the second drum 6 are separate rotatable about their respective central axes A1, A2 at different speeds of rotation of each other.

De préférence, la vitesse de rotation du premier tambour 4 est réglable par rapport à la vitesse de rotation du deuxième tambour 6. La vitesse de rotation du premier tambour 4 peut prendre plusieurs valeurs différentes pour une même vitesse de rotation du deuxième tambour 6.Preferably, the rotational speed of the first drum 4 is adjustable with respect to the speed of rotation of the second drum 6. The rotational speed of the first drum 4 can take several different values for the same speed of rotation of the second drum 6.

Pour ce faire, dans un mode de réalisation, l'installation d'enrobage de granulats 2 comprend un dispositif d'entraînement commun pour l'entraînement en rotation du premier tambour 4 et du deuxième tambour 6, le premier tambour 4 et le deuxième tambour 6 étant couplés au dispositif d'entraînement commun respectivement par une première transmission mécanique et une deuxième transmission mécanique, au moins la première transmission mécanique possédant plusieurs rapports de transmission sélectionnables.To do this, in one embodiment, the aggregate coating plant 2 comprises a common drive device for driving in rotation the first drum 4 and the second drum 6, the first drum 4 and the second drum 6 being coupled to the common drive respectively by a first mechanical transmission and a second mechanical transmission, at least the first mechanical transmission having a plurality of selectable transmission ratios.

De préférence, la vitesse de rotation du premier tambour 4 est réglable indépendamment de la vitesse de rotation du deuxième tambour 6.Preferably, the speed of rotation of the first drum 4 is adjustable independently of the speed of rotation of the second drum 6.

Pour ce faire, sur la Figure 1, l'installation d'enrobage de granulats 2 comprend un premier dispositif d'entraînement 24 pour l'entraînement en rotation du premier tambour, et un deuxième dispositif d'entraînement 26 pour l'entraînement en rotation du deuxième tambour, le deuxième dispositif d'entraînement 24 étant distinct du premier moteur dispositif d'entraînement 26. Le premier dispositif d'entraînement 24 et le deuxième dispositif d'entraînement 26 sont réglables indépendamment l'un de l'autre pour le réglage de la vitesse de rotation du premier tambour 4 indépendamment de la vitesse de rotation du deuxième tambour 6.To do this, on the Figure 1 , the aggregate coating plant 2 comprises a first drive device 24 for driving in rotation the first drum, and a second drive device 26 for driving in rotation the second drum, the second the drive 24 being separate from the first drive motor 26. The first drive device 24 and the second drive device 26 are adjustable independently of each other for adjusting the rotational speed of the first drum 4 regardless of the speed of rotation of the second drum 6.

Chaque dispositif d'entraînement est configuré pour générer un couple d'entraînement en rotation. Chaque dispositif d'entraînement comprend par exemple un moteur ou une série de moteurs.Each drive device is configured to generate a rotational drive torque. Each drive device comprises for example a motor or a series of motors.

Le réglage de la vitesse de rotation du premier tambour 4 permet d'ajuster la température des gaz de chauffage sortant du premier tambour 4. En effet, la variation de la vitesse du tambour permet de faire varier la densité du rideau de matériaux et la vitesse d'avancement des matériaux.The adjustment of the speed of rotation of the first drum 4 makes it possible to adjust the temperature of the heating gases leaving the first drum 4. In fact, the variation of the speed of the drum makes it possible to vary the density of the curtain of materials and the speed progress of materials.

En fonctionnement, les granulats sont séchés et chauffés par les gaz chauds dans le premier tambour 4. Les gaz chauds générés par le brûleur 8 sont chauffés jusqu'à une température élevée (première température T1) et sortent du premier tambour 4 à une température modérée (deuxième température T2) du fait d'un premier échange thermique avec les granulats. Les agrégats d'enrobé sont séchés et chauffés dans le deuxième tambour 6 alimenté avec les gaz à température modérée (deuxième température T2) sortant du premier tambour 4, tout en étant mélangés avec les granulats chauffés préalablement dans le premier tambour 4. Le liant d'apport est mélangé avec les granulats et les agrégats d'enrobé dans le malaxeur 12.In operation, the aggregates are dried and heated by the hot gases in the first drum 4. The hot gases generated by the burner 8 are heated to a high temperature (first temperature T1) and leave the first drum 4 at a moderate temperature (Second temperature T2) due to a first heat exchange with the aggregates. The asphalt aggregates are dried and heated in the second drum 6 fed with the gases at moderate temperature (second temperature T2) coming out of the first drum 4, while being mixed with the aggregates previously heated in the first drum 4. The binder The feed is mixed with the aggregates and asphalt aggregates in the mixer 12.

Cette installation d'enrobage de granulats 2 permet un taux de recyclage très élevé, notamment un taux de recyclage égal ou supérieur à 50%.This aggregate coating plant 2 allows a very high recycling rate, including a recycling rate equal to or greater than 50%.

Les agrégats d'enrobés ne sont pas soumis à la radiation de la flamme F du brûleur 8 et ne sont pas en contact avec des gaz à température très élevée généré par le brûleur 8.The asphalt aggregates are not subjected to the radiation of the flame F of the burner 8 and are not in contact with very high temperature gases generated by the burner 8.

L'utilisation des gaz sortant du premier tambour 4 pour le séchage des agrégats d'enrobé dans le deuxième tambour 6 limite la puissance nécessaire à apporter pour le chauffage des agrégats d'enrobé.The use of the gases leaving the first drum 4 for drying the asphalt aggregates in the second drum 6 limits the power required to provide for the heating of the asphalt aggregates.

Le mélange, dans le deuxième tambour 6, des agrégats d'enrobé avec les granulats chauds sortant du premier tambour 4 permet d'apporter une partie de la chaleur nécessaire au séchage des agrégats d'enrobés par l'intermédiaire des granulats et limite encore la puissance nécessaire à apporter pour le chauffage des agrégats d'enrobé.The mixing, in the second drum 6, asphalt aggregates with the hot aggregates leaving the first drum 4 provides part of the heat required for drying asphalt aggregates through the aggregates and further limits the power required for heating asphalt aggregates.

L'ajustement de la température des gaz sortant du premier tambour 4 et alimentant le deuxième tambour 6 pour le séchage des agrégats d'enrobé permet d'alimenter le deuxième tambour 6 avec des gaz ayant une température appropriée pour un recyclage d'agrégats d'enrobé avec un taux de recyclage élevé.Adjusting the temperature of the gases leaving the first drum 4 and supplying the second drum 6 for drying the asphalt aggregates makes it possible to supply the second drum 6 with gases having a temperature suitable for a recycling of aggregates. coated with a high recycling rate.

L'installation d'enrobage de granulats 2 comprend un seul brûleur, ce qui limite ses coûts de fabrication, d'exploitation et de maintenance.The aggregate coating plant 2 comprises a single burner, which limits its manufacturing, operating and maintenance costs.

Le malaxeur 12 séparé peut être assaini et les émissions peuvent être incinérées dans la flamme F du brûleur 8.The separate mixer 12 can be sanitized and the emissions can be incinerated in the flame F of the burner 8.

Le mode de réalisation de la Figure 2 diffère de celui de la Figure 1 en ce que le deuxième tambour 6 est à contre-courant. Il est configuré pour que les gaz y circulent de l'extrémité abaissée 6B vers l'extrémité relevée 6A.The embodiment of the Figure 2 differs from that of the Figure 1 in that the second drum 6 is countercurrent. It is configured for the gases to flow from the lowered end 6B to the raised end 6A.

L'extrémité abaissée 6B du deuxième tambour 6 est relié fluidiquement à l'extrémité abaissée 4B du premier tambour 4 pour l'alimentation de l'extrémité abaissée 6B du deuxième tambour 6 avec les gaz sortant à l'extrémité abaissée 6B du premier tambour 4.The lowered end 6B of the second drum 6 is fluidly connected to the lowered end 4B of the first drum 4 for feeding the lowered end 6B of the second drum 6 with the gases exiting at the lowered end 6B of the first drum 4 .

Le mode de réalisation de la Figure 3 diffère de celui de la Figure 1 en ce que le deuxième tambour 6 est un tambour sécheur et malaxeur ou « sécheur-malaxeur ». L'installation d'enrobage de granulats 2 est ici dépourvue de malaxeur séparé.The embodiment of the Figure 3 differs from that of the Figure 1 in that the second drum 6 is a drying drum and kneader or "drier-kneader". The aggregate coating plant 2 is here devoid of separate mixer.

Le deuxième tambour 6 comprend successivement, depuis son extrémité relevée 6A vers son extrémité abaissée 6B, un tronçon de séchage 30 et un tronçon de malaxage 32. Le dispositif d'alimentation en liant d'apport 14 est agencé pour introduire le liant d'apport à l'intérieur du deuxième tambour 6, dans le tronçon de malaxage 32.The second drum 6 successively comprises, from its raised end 6A towards its lowered end 6B, a drying section 30 and a kneading section 32. The feed binder supply device 14 is arranged to introduce the feed binder. inside the second drum 6, in the mixing section 32.

L'invention n'est pas limitée aux modes de réalisation des Figures 1 à 3 et à leur variantes décrites ci-dessus.The invention is not limited to the embodiments of the Figures 1 to 3 and their variants described above.

Dans les différents modes de réalisation, le premier tambour 4 est à co-courant. En variante, le premier tambour 4 est à contre-courant, les gaz circulant dans le premier tambour 4 en sens opposés du sens d'avancement des granulats. Dans ce cas, le brûleur 8 est disposé à l'intérieur du premier tambour 4 à proximité de l'extrémité abaissée 4B du premier tambour 4.In the various embodiments, the first drum 4 is co-current. Alternatively, the first drum 4 is against the current, the gas flowing in the first drum 4 in opposite directions of the direction of advance of the aggregates. In this case, the burner 8 is disposed inside the first drum 4 near the lowered end 4B of the first drum 4.

Dans le cas où le premier tambour 4 est à contre-courant, celle de l'extrémité relevée 6A et de l'extrémité abaissée 6B du deuxième tambour 6 qui est prévue pour l'entrée des gaz, et reliée fluidiquement à l'extrémité relevée du premier tambour 4 de manière à être alimentée avec les gaz sortant du premier tambour 4.In the case where the first drum 4 is against the current, that of the raised end 6A and the lowered end 6B of the second drum 6 which is provided for the gas inlet, and fluidly connected to the raised end of the first drum 4 so as to be fed with the gases leaving the first drum 4.

De manière générale, l'extrémité du premier tambour 4 par laquelle les gaz sortent est reliée fluidiquement à l'extrémité du deuxième tambour 6 par laquelle les gaz sont introduits dans le deuxième tambour 6, de manière à alimenter le deuxième tambour avec au moins une fraction des gaz sortant du premier tambour 4.In general, the end of the first drum 4 through which the gases exit is fluidly connected to the end of the second drum 6 through which the gases are introduced into the second drum 6, so as to feed the second drum with at least one fraction of gases leaving the first drum 4.

De préférence, le deuxième tambour 6 est alimenté en gaz uniquement avec les gaz sortant du premier tambour 4.Preferably, the second drum 6 is supplied with gas only with the gases leaving the first drum 4.

Sur les Figures 1 à 3, le brûleur 8 est disposé à l'intérieur du premier tambour.On the Figures 1 to 3 the burner 8 is disposed inside the first drum.

En variante, l'installation d'enrobage de granulats 2 comprend une chambre de combustion distincte et séparée du premier tambour, le brûleur étant disposé à l'intérieur de la chambre de combustion, la chambre de combustion étant reliée fluidiquement au premier tambour pour faire circuler les gaz chauds dans le premier tambour. La chambre de combustion est reliée fluidiquement à l'extrémité relevée du premier tambour ou à l'extrémité abaissée du premier tambour selon que le premier tambour est à co-courant ou à contre-courant.Alternatively, the aggregate coating plant 2 comprises a separate combustion chamber and separated from the first drum, the burner being disposed within the combustion chamber, the combustion chamber being fluidly connected to the first drum to circulate the hot gases in the first drum. The combustion chamber is fluidly connected to the raised end of the first drum or to the lowered end of the first drum depending on whether the first drum is co-current or countercurrent.

Dans cette variante, le cas échéant, le circuit de recirculation de gaz 16 est configuré pour réinjecter les gaz prélevés à la sortie du deuxième tambour dans la chambre de combustion et/ou dans le premier tambour, à l'extrémité du premier tambour 4 par laquelle les gaz chauds sont introduits dans le premier tambour 4.In this variant, where appropriate, the gas recirculation circuit 16 is configured to reinject the gases taken at the outlet of the second drum into the combustion chamber and / or into the first drum at the end of the first drum 4. which hot gases are introduced into the first drum 4.

Dans cette variante également, le cas échéant, le circuit de récupération d'émissions est configuré pour réinjecter les émissions dans la chambre de combustion, pour leur incinération dans la flamme F du brûleur 8.In this variant also, where appropriate, the emission recovery circuit is configured to reinject the emissions into the combustion chamber for incineration in the flame F of the burner 8.

Dans tous les cas, le circuit de récupération d'émissions est configuré pour la réinjection des émissions dans les gaz en amont du brûleur 8 pour l'incinération des émissions dans la flamme F du brûleur 8.In any case, the emission recovery circuit is configured for the reinjection of the emissions into the gases upstream of the burner 8 for the incineration of the emissions in the flame F of the burner 8.

Par ailleurs, dans les modes de réalisation des Figures 1 à 3, la totalité des granulats sortant du premier tambour 4 sont transférés de l'extrémité abaissée 4B du premier tambour 4 à l'extrémité relevée 6A.Moreover, in the embodiments of Figures 1 to 3 all the aggregates coming out of the first drum 4 are transferred from the lowered end 4B of the first drum 4 to the raised end 6A.

En option ou en variante, des granulats chauds sortant du premier tambour 4 sont introduits dans le deuxième tambour 6 directement dans un tronçon intermédiaire du deuxième tambour 6, situé à distance de l'extrémité relevée 6A du deuxième tambour 6.Optionally or alternatively, hot aggregates coming out of the first drum 4 are introduced into the second drum 6 directly into an intermediate section of the second drum 6, situated at a distance from the raised end 6A of the second drum 6.

Pour ce faire, comme illustré en pointillés sur les Figures 1 à 3, l'installation d'enrobage de granulats 2 comprend par exemple un anneau d'introduction 34 disposé sur le deuxième tambour 6 à distance de l'extrémité relevée 6A du deuxième tambour 6, et relié à l'extrémité abaissée 4B du premier tambour 4 pour recevoir les granulats chaud sortant du premier tambour 4.To do this, as illustrated in dotted lines on Figures 1 to 3 , the aggregate coating plant 2 comprises for example an insertion ring 34 disposed on the second drum 6 at a distance from the raised end 6A of the second drum 6, and connected to the lowered end 4B of the first drum 4 to receive the hot aggregates coming out of the first drum 4.

Ainsi, il est possible d'introduite une fraction des granulats chauds sortant du premier tambour 4 à l'entrée relevée 6A du deuxième tambour 6, et une autre fraction des granulats chauds sortant du premier tambour 4 dans un tronçon intermédiaire du deuxième tambour 6.Thus, it is possible to introduce a fraction of the hot aggregates leaving the first drum 4 at the raised inlet 6A of the second drum 6, and another fraction of the hot aggregates leaving the first drum 4 in an intermediate section of the second drum 6.

Dans les modes de réalisation des Figures 1 à 3, la totalité des granulats frais sont introduits dans le premier tambour 4 par son extrémité relevée 4A.In the embodiments of Figures 1 to 3 , all the fresh aggregates are introduced into the first drum 4 by its raised end 4A.

En option ou en variante, des granulats frais alimentent l'extrémité relevée 6A du deuxième tambour 6.Optionally or alternatively, fresh aggregates feed the raised end 6A of the second drum 6.

Pour ce faire, l'installation d'enrobage de granulats 2 comprend un dispositif d'alimentation auxiliaire 36 pour introduire des granulats frais dans l'extrémité relevée 6A du deuxième tambour 6.To do this, the aggregate coating plant 2 comprises an auxiliary supply device 36 for introducing fresh aggregates into the raised end 6A of the second drum 6.

En option ou en variante, des granulats frais sont introduits dans le deuxième tambour 6 directement dans un tronçon intermédiaire du deuxième tambour 6, situé à distance de l'extrémité relevée 6A du deuxième tambour 6.Optionally or alternatively, fresh aggregates are introduced into the second drum 6 directly into an intermediate portion of the second drum 6, located at a distance from the raised end 6A of the second drum 6.

Pour ce faire, comme illustré en pointillés sur les Figures 1 à 3, l'installation d'enrobage de granulats 2 comprend en option un dispositif d'introduction de granulat frais 38 pour introduire des granulats frais dans le deuxième tambour 6 directement dans un tronçon intermédiaire du deuxième tambour 6, situé à distance de l'extrémité relevée 6A du deuxième tambour 6, par exemple par l'intermédiaire d'un anneau d'introduction 34.To do this, as illustrated in dotted lines on Figures 1 to 3 , the aggregate coating plant 2 optionally comprises a fresh aggregate introduction device 38 for introducing fresh aggregates into the second drum 6 directly into an intermediate section of the second drum 6, located at a distance from the raised end. 6A of the second drum 6, for example via an insertion ring 34.

Ainsi, de manière générale, les granulats frais sont introduits dans le premier tambour 4 et/ou directement dans le deuxième tambour 6.Thus, in general, the fresh aggregates are introduced into the first drum 4 and / or directly into the second drum 6.

De préférence, au moins une fraction des granulats frais est introduite dans le premier tambour 4 à son extrémité relevée 4A. Cette fraction est préférablement une fraction majoritaire, représentant au moins 50% de la quantité de granulats frais, encore de préférence au moins 80% de la quantité de granulats frais. Dans un mode de réalisation particulier, la totalité des granulats frais est introduite dans le premier tambour 4 à son extrémité relevée 4A.Preferably, at least a fraction of the fresh aggregates is introduced into the first drum 4 at its raised end 4A. This fraction is preferably a major fraction, representing at least 50% of the amount of fresh aggregate, more preferably at least 80% of the amount of fresh aggregate. In a particular embodiment, all the fresh aggregates are introduced into the first drum 4 at its raised end 4A.

Dans les modes de réalisation des Figures 1 et 2, les granulats chauds alimentant le malaxeur 12 externe proviennent du deuxième tambour 6.In the embodiments of Figures 1 and 2 the hot aggregates feeding the external mixer 12 come from the second drum 6.

En variante ou en option, des granulats chauds sortant du premier tambour 4 sont introduits directement dans le malaxeur 12 sans passer par le deuxième tambour 6.Alternatively or optionally, hot aggregates leaving the first drum 4 are introduced directly into the mixer 12 without passing through the second drum 6.

Pour ce faire, l'installation d'enrobage de granulats 2 comprend par exemple un dispositif de transfert auxiliaire 40 pour transférer des granulats directement de l'extrémité abaissée 4B du premier tambour 4 au malaxeur 12 sans passer par le deuxième tambour 6.For this purpose, the aggregate coating plant 2 comprises, for example, an auxiliary transfer device 40 for transferring aggregates directly from the lowered end 4B of the first drum 4 to the mixer 12 without passing through the second drum 6.

Dans les modes de réalisation des Figures 1 à 3, la totalité des agrégats d'enrobés frais est introduite dans le deuxième tambour 6 par son extrémité relevée 6A.In the embodiments of Figures 1 to 3 all the aggregates of fresh mixes are introduced into the second drum 6 by its raised end 6A.

En variante, seule une fraction des agrégats d'enrobé frais est introduite dans le deuxième tambour 6 par son extrémité relevée 6A. Comme illustré en pointillés sur les Figures 1 à 3, la fraction restante des agrégats d'enrobé frais est par exemple introduite dans le premier tambour 4, par son extrémité relevée 4A. Ainsi, une fraction des agrégats d'enrobé frais est introduite dans le premier tambour 4 et une autre fraction des agrégats d'enrobé frais est introduite dans le deuxième tambour 6.Alternatively, only a fraction of the fresh mix aggregates is introduced into the second drum 6 by its raised end 6A. As illustrated in dotted lines on Figures 1 to 3 the remaining fraction of the fresh asphalt aggregates is for example introduced into the first drum 4, with its raised end 4A. Thus, a fraction of the fresh asphalt aggregates is introduced into the first drum 4 and another fraction of the fresh asphalt aggregates is introduced into the second drum 6.

De manière générale, au moins une fraction des agrégats d'enrobé frais est introduite dans le deuxième tambour 6 pour son séchage par circulation de gaz ayant déjà circulé dans le premier tambour 6.In general, at least a fraction of the fresh asphalt aggregates is introduced into the second drum 6 for drying by circulation of gas that has already circulated in the first drum 6.

De préférence, la fraction des agrégats d'enrobé frais introduite dans le deuxième tambour 6 est une fraction majoritaire des agrégats d'enrobés frais, représentant au moins 50% de la quantité d'agrégats d'enrobés frais, de préférence au moins 80% de la quantité d'agrégats d'enrobés frais, et dans un mode de réalisation particulier, la totalité des agrégats d'enrobé frais.Preferably, the fraction of the fresh mixes introduced into the second drum 6 is a majority fraction of the fresh mixes aggregates, representing at least 50% of the quantity of fresh asphalt aggregates, preferably at least 80% the quantity of fresh asphalt aggregates, and in a particular embodiment, all the fresh asphalt aggregates.

Dans les modes de réalisation des Figures 1 et 2, le malaxeur 12 est un malaxeur continu qui reçoit et traite de manière continue les granulats et les agrégats d'enrobé.In the embodiments of Figures 1 and 2 the kneader 12 is a continuous kneader which continuously receives and processes aggregates and asphalt aggregates.

En variante, le malaxeur 12 est un malaxeur discontinu qui traite les granulats et les agrégats d'enrobé par gâchées successives.Alternatively, the kneader 12 is a batch kneader which processes aggregates and asphalt aggregates by successive drills.

Dans un tel cas, l'installation d'enrobage de granulat 2 comprend un dispositif de stockage disposé entre le deuxième tambour 6 et le malaxeur 12 pour stocker temporairement les granulats et les agrégats d'enrobé chaud, avant de les fournir au malaxeur 12.In such a case, the aggregate coating plant 2 comprises a storage device disposed between the second drum 6 and the mixer 12 for temporarily storing aggregates and aggregates of hot mix, before supplying them to the mixer 12.

Claims (10)

  1. An aggregate coating installation for producing asphalt from fresh aggregate and recycled fresh asphalt aggregates, the installation comprising a first drying drum (4) for drying by gas circulation in the first drum (4), and a second drying drum (6) for drying by gas circulation in the second drum (6), the second drum (6) being separate from the first drum (4), the installation being configured to supply the second drum with at least one fraction of recycled fresh asphalt aggregates, the second drum (6) being fluidly connected in series with the first drum (4) for the circulation, in the second drum (6), of gas having previously circulated in the first drum (4), characterized in that the installation comprises a recirculation circuit (16) configured to reinject, into the first drum (4), gases having circulated in the second drum (6).
  2. The aggregate coating installation according to claim 1, wherein the first drum (4) has parallel currents or is co-current, and the second drum (6) has parallel currents or is co-current.
  3. The aggregate coating installation according to claim 1 or 2, comprising a single burner (8) provided to heat the gases circulating in the first drum (4).
  4. The aggregate coating installation according to any one of the preceding claims, wherein the rotation speed of the first drum is variable relative to the rotation speed of the second drum.
  5. The aggregate coating installation according to any one of the preceding claims, configured for the introduction, into the second drum (6), of hot gravel leaving the first drum (4), to be mixed with the asphalt aggregates supplying the second drum (6).
  6. The aggregate coating installation according to claim 5, comprising a device for supplying added binder (14) in order to introduce the added binder into the second drum, to mix the asphalt aggregates and the aggregate with the added binder in the second drum (6).
  7. The aggregate coating installation according to claim 5, comprising an external mixer (12) arranged to receive the aggregate and the asphalt aggregates leaving the second drum (6) and a device for supplying added binder (14) for introducing added binder into the external mixer (12), to mix the asphalt aggregates and the aggregate supplied by the second drum (6) with the added binder.
  8. The aggregate coating installation according to claim 7, comprising an emissions recovery circuit (20) for recovering emissions produced in the mixer (12) and re-injecting them into the gases circulating in the first drum (4).
  9. The aggregate coating installation according to any one of the preceding claims, comprising a burner (8) arranged inside the first drum (4) for generating the hot gases circulating inside the first drum (4).
  10. An aggregate coating method for producing asphalt from fresh aggregate and recycled fresh asphalt aggregates, the method comprising the circulation of hot gases in a first rotary drying drum (4), the supply of a second rotary drying drum (6) with at least a fraction of the recycled fresh asphalt aggregates, the circulation in the second drum (6) of the gases having previously circulated in the first drum (4), to drive the asphalt aggregates supplying the second drum (6), and characterized by the reinjection in the first drum (4) of the gases having circulated in the second drum (6).
EP17170410.9A 2016-05-10 2017-05-10 Installation and process of gravel coating Active EP3243957B2 (en)

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FR3079020B1 (en) * 2018-03-19 2020-08-07 Argumat BLUE SMOKE BURNER FOR THE DEPOLLUTION OF A COATING PLANT, COATING PLANT AND ASSOCIATED DEPOLLUTION PROCESS
CN109706821A (en) * 2019-03-04 2019-05-03 江苏人杰筑路机械科技有限公司 A kind of full reclaimed asphalt mixture mixing plant of environment-friendly and energy-efficient
FR3126432B1 (en) * 2021-08-26 2023-08-04 Argumat ASPHALT PRODUCTION FACILITY AND ASPHALT MANUFACTURING METHOD IN SUCH ASPHALT PRODUCTION FACILITY

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FR3051203A1 (en) 2017-11-17
FR3051203B1 (en) 2019-09-06
EP3243957B2 (en) 2021-12-15
ES2715484T5 (en) 2022-03-28
ES2715484T3 (en) 2019-06-04

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