EP3412829A1 - Facility and method for producing asphalts - Google Patents

Facility and method for producing asphalts Download PDF

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Publication number
EP3412829A1
EP3412829A1 EP18176605.6A EP18176605A EP3412829A1 EP 3412829 A1 EP3412829 A1 EP 3412829A1 EP 18176605 A EP18176605 A EP 18176605A EP 3412829 A1 EP3412829 A1 EP 3412829A1
Authority
EP
European Patent Office
Prior art keywords
drum
aggregates
asphalt
recycling
binder
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.)
Granted
Application number
EP18176605.6A
Other languages
German (de)
French (fr)
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EP3412829B1 (en
Inventor
Thierry De Sars
Hervé Riche
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Ermont
Original Assignee
Ermont
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Publication date
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Publication of EP3412829A1 publication Critical patent/EP3412829A1/en
Application granted granted Critical
Publication of EP3412829B1 publication Critical patent/EP3412829B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, 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
    • E01C19/10Apparatus 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
    • E01C19/1013Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1027Mixing in a rotary receptacle
    • E01C19/1036Mixing 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
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, 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
    • E01C19/10Apparatus 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
    • E01C19/1059Controlling the operations; Devices solely for supplying or proportioning the ingredients
    • E01C19/1068Supplying or proportioning the ingredients
    • E01C19/1072Supplying or proportioning the ingredients the solid ingredients
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, 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
    • E01C19/10Apparatus 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
    • E01C2019/1081Details not otherwise provided for
    • E01C2019/109Mixing containers having a counter flow drum, i.e. the flow of material is opposite to the gas flow
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, 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
    • E01C19/10Apparatus 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
    • E01C2019/1081Details not otherwise provided for
    • E01C2019/1095Mixing 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 asphalt production installations, in particular asphalt paving for road surfacing, with recycling of asphalt 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.
  • drying drum is called “drier-kneader” or in a separate external kneader and separated from the drying drum.
  • a co-current dryer-mixer drum successively comprising, from its raised end towards its lowered end, a drying section for drying the aggregates, a recycling ring for introducing asphalt aggregates.
  • a drying section for mixing and drying aggregates and asphalt aggregates
  • a kneading section for kneading the mixture with a binder, the binder being introduced into the kneading section.
  • the hot gases circulating in the dryer-kneader drum are generated by means of a burner disposed inside the drying drum, close to the raised end of the drying drum.
  • a countercurrent drier-kneader drum comprising successively from its raised end towards its lowered end, a drying section for drying the aggregates, a recycling ring for introducing asphalt aggregates into the drying drum.
  • mixer a mixing section for mixing the aggregates and asphalt aggregates, and a kneading section for kneading the mixture with a filler, the filler 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, generating a flame upstream of the point of introduction of the asphalt aggregates, the hot gases flowing towards the upstream.
  • a drying drum for drying the aggregates
  • a mixing drum separate from the drying drum, the aggregates and aggregates and the binder being introduced into the kneading drum.
  • the aggregates are for example superheated in the drying drum to provide the amount of heat required for heating the asphalt aggregates in the kneading drum.
  • the flow of hot gas circulating in the drying drum for drying the asphalt aggregates is generated by a burner disposed in this drying drum or by a hot gas generator comprising a separate chamber of the drying drum and a burner for generating the hot gases.
  • the enclosure being fluidly connected to the drying drum for conveying the hot gases into the drying 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.
  • One of the aims of the invention is to propose an installation for the production of asphalt which can allow a high rate of recycling of asphalt aggregates while limiting the pollutant emissions.
  • the invention proposes a plant for producing mixes from aggregates and aggregates of recycled mixes, comprising a drying drum rotatably mounted about a central axis of the drum, the drum having an end raised for the introduction of aggregates and a lowered end, a burner configured to generate a flow of hot gas flowing in the drum of the end raised towards the lowered end, one or more ring (s) of recycling disposed (s) along drum for the introduction of recycled asphalt aggregates, the drum comprising an upstream drying section situated upstream of the recycling ring (s) and a downstream drying section situated downstream of the ring (s) of recycling, a filter device configured to filter hot gases collected at the lowered end of the drum, and a kneader separate from the drum and configured to mix aggregates and aggregates of recycled mixes s out of the drum with a filler binder.
  • the invention also relates to a method for producing asphalt from aggregates and recycled asphalt aggregates, comprising introducing granules into a rotary drying drum, the drum having a raised end for the introduction of aggregates and a lowered end, the generation of a flow of hot gas flowing in the drum of the end raised towards the lowered end, the introduction of asphalt aggregates into the drum via one or more ring (s) of recycling disposed along the drum, the drum comprising an upstream drying section located upstream of the ring (s) recycling and a downstream drying section located downstream of the ring (s) recycling, recovery and filtering hot gases exiting the drum in a filter device, and mixing aggregates and asphalt aggregates with a binder in a kneader separate from the drum.
  • the installation 2 for the production of asphalt Figure 1 is configured for the production of asphalt mix asphalt mix asphalt from fresh aggregates and fresh recycled asphalt aggregates.
  • cost means that the aggregates or aggregates of mixes are wet and cold and have not yet been dried - completely or partially - in the plant 2.
  • the installation 2 comprises a drum 4 for drying aggregates by circulating a flow of gas in the drum 4.
  • the drum 4 extends along a central axis A and is rotatably mounted about its central axis A.
  • the central axis A is inclined at a non-zero angle with respect to the horizontal plane.
  • the angle of inclination of the central axis A with respect to the horizontal plane is for example between 2 ° and 6 °.
  • the drum 4 thus has a raised end 4A and a lowered end 4B.
  • the raised end 4A is located at a level higher than that of the lowered end 4B.
  • the raised end 4A defines an inlet for the fresh aggregates and the lowered end 4B defines an outlet for a mixture formed of aggregates G and aggregates of recycled AE mixes introduced into the drum 4.
  • the installation 2 comprises a feed device 6 configured to feed the raised end 4A of the first drum 4 in fresh G granules.
  • downstream and upstream refer to the direction of flow of the aggregates G in the drum 4, from the raised end 4A to the lowered end 4B.
  • the installation 2 comprises a device for generating hot gases 8 configured to generate hot gases and to circulate the hot gases in the drum 4 from the raised end 4A towards the lowered end 4B, ie in the same direction as the Aggregates G.
  • the drum 4 is a drying drum said to "parallel currents" or "co-currents”.
  • the hot gas generating device 8 comprises a burner 10 arranged to generate a flame F inside the drum 4.
  • the burner 10 is configured to generate the flame F from a fuel and a fuel. an oxidizer.
  • the oxidant is for example air.
  • the installation 2 comprises one or more recycling ring (s) 12, 14 arranged along the drum 4 for the introduction of asphalt aggregates AE inside the drum 4.
  • Each recycling ring 12 14 is disposed along the drum 4 away from the raised end 4A and away from the lowered end 4B.
  • the drum 4 comprises several drying sections TA, TI, TB consecutive along the drum 4.
  • the drum 4 is provided on its inner surface with lifting blades 16 configured to lift the aggregates G and / or the asphalt aggregates AE, so that to form, in operation, a curtain of aggregates and / or asphalt aggregates AE traversed by the hot gases flowing in the drum 4.
  • the lifting blades 16 can create, respectively in each drying section TA, TI, TB, a curtain more or less dense.
  • the drum 4 comprises an upstream drying section TA situated upstream of the recycling ring (s) 12, 14, and a downstream drying section TB situated downstream of the recycling ring (s) 12, 14.
  • the drum 4 comprises a plurality of recycling rings 12, 14, the drum 4 comprises an intermediate drying section TI between each pair of adjacent recycling rings.
  • the upstream drying section TA is located upstream of the recycling ring 14 located furthest upstream.
  • the downstream drying section TB is situated between the recycling ring 14 located furthest downstream and the lowered end 4 of the drum 4.
  • the hot gases cool progressively along the drum 4 because of the heat exchanges with the aggregates G and aggregates of AE mixes present in the drum 4.
  • the hot gases are progressively less and less hot when passing from one drying section to the next while moving from upstream to downstream of the drum 4.
  • the temperature of the hot gases gradually decreases along the drum 4 because of the heat exchange, in particular with the granules G.
  • Separate asphalt aggregate fractions can be introduced via a plurality of recycling rings selected from the plurality of recycle rings, each asphalt aggregate fraction being introduced via a respective recycle ring.
  • a fraction of asphalt aggregates introduced further upstream will be subjected to hot gases at a higher temperature than that of the hot gases to which is subjected a fraction of asphalt aggregates introduced further downstream. This allows for example to subject asphalt aggregate fractions having different binder contents to hot gases at different temperatures.
  • the drum 4 comprises exactly two recycling rings 12, 14 delimiting between them an intermediate drying section TI.
  • the drum 4 comprises, from upstream to downstream, the upstream drying section TA, the intermediate drying section TI and the downstream drying section TB.
  • the installation 2 is configured for the introduction into the drum 4, selectively, of all asphalt aggregates AE via the upstream recycling ring 12, of all the asphalt aggregates AE via the ring. 14 or downstream of a first fraction of asphalt aggregates AE1 and a second fraction of asphalt aggregates AE2 via respectively the recycling ring 12 located upstream and the recycling ring 14 located downstream.
  • the first fraction of asphalt aggregates AE1 and the second fraction of asphalt aggregates AE2 have, for example, different binder contents.
  • the first fraction of asphalt aggregates AE1 introduced further upstream have a binder content lower than that of the second fraction of asphalt aggregates AE2 introduced further downstream.
  • the drum 4 does not have a kneading section configured for kneading aggregates G and asphalt aggregates AE.
  • the aggregate coating plant 2 comprises an external kneader configured to knead the mixture of aggregates G and asphalt aggregates AE exiting the drum 4 at the lowered end 4B thereof.
  • the kneader 20 is distinct and separated from the drum 4. It receives the mixture of aggregates G and asphalt aggregates AE after it has emerged from the drum 4.
  • the asphalt aggregates AE mixed with the aggregates G already contain binder, called “recycling binder”, from the asphalt aggregates AE. It may be necessary to also provide additional binder, called “binder”.
  • the binder is, for example, bitumen.
  • the installation 2 comprises a delivery binder supply device 22 for introducing the binder into the mixer 20.
  • the installation 2 comprises a recycling circuit 24, configured to collect binder vapors present in the mixer 20 and to reinject them into the plant 2 so that the binder vapors are incinerated in the flame F of the burner 10.
  • the recycling circuit 24 is here configured to reinject the binder vapors in the drum 4, upstream of the flame F generated by the burner 10, so that the binder vapors are incinerated in the flame F.
  • the recycling circuit 24 is here configured to reinject the binder vapors into the drum 4, at the raised end 4A of the drum 4.
  • the installation 2 comprises a gas collector 26 arranged at the lowered end 4B of the drum 4 to collect the hot gases leaving the drum 4, and a filtering device 28 fluidly connected to the gas collector 26 for filtering the gases collected by the gas collector 26.
  • the filter device 28 is for example a bag filter.
  • an external mixer separate and separate from the drum 4 avoids exposing the supply binder to the hot gases and makes it possible to collect the binder vapors generated in the mixer 20 and the hot gases leaving the drum 4 separately.
  • the gas manifold 26 and the recycling circuit 24 are separate and separate.
  • the installation 2 comprises a heat exchanger 30 disposed downstream of the filtering device 28 is configured for a heat exchange between the hot gases filtered by the filtering device 28 and an oxidant supplying the burner 10.
  • the oxidant is here air.
  • the heat exchanger 30 has separate flows.
  • the hot gases and the oxidant are not in contact during the heat exchange. They exchange heat through one or more walls.
  • the heat exchanger 30 is here a gas / gas heat exchange, configured for a heat exchange between the filtered hot gases and the oxidizer which is in the gaseous state.
  • the installation 2 comprises a chimney 32 for the evacuation of the hot gases filtered in the atmosphere.
  • the chimney 32 is here disposed downstream of the heat exchanger 30.
  • the chimney 32 is for example arranged directly downstream of the filtering device 28.
  • the drum 4 In operation, the drum 4 is rotated about its central axis A and the hot gases generated by the burner 10 flow in the drum 4 from the raised end 4A to the lowered end 4B.
  • Aggregates G are introduced at the raised end 4A of drum 4. They are first dried alone in the upstream drying section TA. They are then mixed with asphalt aggregates AE introduced into the drum 4 via one or more recycling rings 12, 14, which are mixed and dried with the aggregates in the or each optional intermediate drying section TI and in the downstream drying section TB.
  • the aggregates G and the asphalt aggregates AE are kneaded in the kneader 20, with the binder.
  • the hot gases are collected at the lowered end 4 of the drum 4 by the gas manifold 26 and then filtered by the filtering device 28.
  • a heat exchange is carried out between the filtered hot gases and the oxidant supplying the burner 10, in the heat exchanger 30.
  • the binder vapors recovered in the mixer 20 are reintroduced into the plant 2 so as to be incinerated by the flame F of the burner 10.
  • the temperature of hot gases decreases from upstream to downstream due to heat exchanges with the aggregates G and asphalt aggregates AE.
  • the temperature of the hot gases in the successive drying sections gradually decreases.
  • the selective use of one or more recycling rings among the plurality of recycling rings 12, 14 makes it possible to expose the aggregates of AE mixes to hot gases at a higher or lower temperature, and / or different fractions. of asphalt aggregates to hot gases at different temperatures. This makes it possible to expose aggregates of AE mixes having a higher binder content to hot gases at a very moderate temperature, further limiting the binder vapor emissions by the asphalt aggregates AE.
  • the kneader 20 separated from the drum 4 makes it possible to supply binder to the outside of the drum 4, this filler binder not being exposed to the hot gases.
  • the binder vapors generated in the mixer 20 are not carried to the filter device 28 and are not ultimately released into the atmosphere.
  • the separate kneader 20 limits the binder vapors in the hot gases collected at the outlet of the drum 4.
  • the reduction of the binder vapors in the hot gases collected at the outlet of the drum 4 limits the risk of clogging of the heat exchanger 30 and preserves its effectiveness.
  • the heat exchanger 30 makes it possible to recover a portion of the energy of the hot gases exiting in the drum 4 and reinject it into the drum 4. It makes it possible to increase the efficiency of the burner 10, and therefore the efficiency of the installation 2.
  • the aggregate coating plant 2 provides a high recycling rate while limiting pollutant emissions.
  • Installation 2 of the Figure 2 differs from that of Figure 1 in that it comprises a single recycling ring 12.
  • the drum 4 has exactly two mixing sections, namely the upstream drying section TA, situated upstream of the recycling ring 12, and the downstream drying section TB located between the recycling ring 12 and the lowered end 4B of the drum 4.
  • the asphalt aggregates AE are introduced into the drum 4 via the recycling ring 12.
  • the invention also relates to a plant for producing asphalt, comprising at least one drying drum rotatably mounted about a central axis inclined at a non-zero angle with respect to a horizontal plane, the drum having a raised end and a lowered end, a burner configured to generate a flow of hot gas circulating in the drum, and a plurality of recycling rings disposed along the drum at a spaced distance, for the introduction of asphalt aggregates within the drum via one or more of the plurality of recycling rings, the drum comprising an intermediate drying section between each pair of adjacent recycling rings.
  • a heat exchanger 30 arranged for heat exchange between hot gases from the drum 4 and an oxidizer, for example air, supplying the burner 10, is advantageous regardless of the particular configuration of the heat exchanger. the installation 2 described above.
  • the invention also relates to a plant for producing asphalt, comprising at least one drying drum rotatably mounted about a central axis inclined at a non-zero angle with respect to a horizontal plane, the drum having a raised end and a lowered end, a burner configured to generate a flow of hot gas flowing in the drum, and a heat exchanger arranged for heat exchange between hot gases circulating in the drum and an oxidizer, for example air, supplying the burner.
  • the heat exchanger may be disposed downstream of a device for filtering hot gases circulating in the drum, in particular between the filtering device and a hot gas evacuation chimney.
  • the drum may be co-current, the flow of gas flowing in the same direction as the aggregates, ie the end raised towards the lowered end, or against the current, the flow of gas flowing in the opposite direction of the aggregates. , ie from the end lowered towards the raised end.
  • the drum may be a drying drum associated with a separate kneader, or a dryer-kneader drum comprising a kneading section intended for mixing the aggregates and any asphalt aggregates introduced into the drum with a filler.
  • the aggregate coating plant may optionally include at least one recycling ring arranged along the drum for the introduction of asphalt aggregates into the drum.
  • the aggregate coating plant may for example comprise a plurality of recycling rings, for example two recycling rings.

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

Abstract

L'installation comprend un tambour (4) sécheur monté rotatif, un brûleur (10) configuré pour générer un flux de gaz chaud circulant dans le tambour (4) d'une extrémité relevée (4A) vers une extrémité abaissée (4B) du tambour (4), au moins un anneau de recyclage (12, 14) pour l'introduction d'agrégats d'enrobés (AE) recyclés dans le tambour (4), un dispositif de filtrage (28) configuré pour filtrer des gaz chauds collectés à l'extrémité abaissée (4B) du tambour (4), et un malaxeur (20) séparé du tambour (4) et configuré pour mélanger des granulats (G) et des agrégats d'enrobés (AE) recyclés sortant du tambour (4) avec un liant d'apport. L'application concerne aussi un procédé de production d'enrobés.The installation comprises a rotatably mounted drum (4), a burner (10) configured to generate a flow of hot gas flowing in the drum (4) from a raised end (4A) to a lowered end (4B) of the drum (4), at least one recycling ring (12, 14) for the introduction of recycled asphalt aggregates (AE) into the drum (4), a filtering device (28) configured to filter collected hot gases at the lowered end (4B) of the drum (4), and a kneader (20) separated from the drum (4) and configured to mix recycled aggregates (G) and recycled asphalt aggregates (AE) from the drum (4). ) with a binder. The application also relates to a process for the production of asphalt.

Description

La présente invention concerne le domaine des installations de production d'enrobés, notamment d'enrobés pour revêtement routier, avec recyclage d'agrégats d'enrobés.The present invention relates to the field of asphalt production installations, in particular asphalt paving for road surfacing, with recycling of 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 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 aggregates, it is possible to introduce the aggregates into a drying 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 gas hot 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 secs et chauds 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.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 comprenant successivement, depuis son extrémité relevée vers son extrémité abaissée, un tronçon de séchage pour sécher les granulats, un anneau de recyclage pour introduire des agrégats d'enrobé dans le tambour sécheur-malaxeur, un tronçon de séchage pour mélanger et sécher les granulats et les agrégats d'enrobé, 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. Les gaz chaud circulant dans le tambour sécheur-malaxeur sont générés à l'aide d'un brûleur disposé à l'intérieur du tambour sécheur, à proximité de l'extrémité relevée du tambour sécheur.To do this, it is possible to provide a co-current dryer-mixer drum successively comprising, from its raised end towards its lowered end, a drying section for drying the aggregates, a recycling ring for introducing asphalt aggregates. in the dryer-kneader drum, a drying section for mixing and drying aggregates and asphalt aggregates, and a kneading section for kneading the mixture with a binder, the binder being introduced into the kneading section. The hot gases circulating in the dryer-kneader drum are generated by means of a burner disposed inside the drying drum, close to the raised end of the drying drum.

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-malaxeur à contre-courant comprenant successivement depuis son extrémité relevée vers son extrémité abaissée, un tronçon de séchage pour sécher les granulats, un anneau de recyclage pour introduire des agrégats d'enrobé dans le tambour sécheur-malaxeur, un tronçon de mélange pour mélanger les granulats et les agrégats d'enrobé, 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. Les gaz chaud circulant dans le tambour sécheur sont générés à l'aide d'un brûleur disposé à l'intérieur du tambour sécheur, générant une flamme en amont du point d'introduction des agrégats d'enrobé, les gaz chaud circulant vers l'amont.It is also possible to provide a countercurrent drier-kneader drum comprising successively from its raised end towards its lowered end, a drying section for drying the aggregates, a recycling ring for introducing asphalt aggregates into the drying drum. mixer, a mixing section for mixing the aggregates and asphalt aggregates, and a kneading section for kneading the mixture with a filler, the filler 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, generating a flame upstream of the point of introduction of the asphalt aggregates, the hot gases flowing towards the upstream.

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 par exemple 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 for example superheated in the drying 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 à contre-courant pour le séchage des granulats et un tambour sécheur à contre-courant ou à co-courant 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 externe distinct des tambours sécheurs. Le flux de gaz chaud circulant dans le tambour sécheur pour le séchage des agrégats d'enrobé est généré par un brûleur disposé dans ce tambour sécheur ou par un générateur de gaz chaud comprenant une enceinte distincte du tambour sécheur 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 counter-current dryer drum for drying aggregates and a counter-current or co-current dryer drum for drying asphalt aggregates, aggregates and asphalt aggregates and feed binder being then introduced into an external kneader separate from the drying drums. The flow of hot gas circulating in the drying drum for drying the asphalt aggregates is generated by a burner disposed in this drying drum or by a hot gas generator comprising a separate chamber of the drying drum and a burner for generating the hot gases. , the enclosure being fluidly connected to the drying drum for conveying the hot gases into the drying 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 élevé, pour augmenter le recyclage des agrégats d'enrobé et limiter la quantité de granulats neuf utilisée. En parallèle, il est souhaitable de pouvoir limiter les émissions polluantes résultant de l'enrobage.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. In parallel, it is desirable to be able to limit the polluting emissions resulting from the coating.

Un des buts de l'invention est de proposer une installation de production d'enrobés pouvant permettre un taux de recyclage d'agrégats d'enrobé important tout en limitant les émissions polluantes.One of the aims of the invention is to propose an installation for the production of asphalt which can allow a high rate of recycling of asphalt aggregates while limiting the pollutant emissions.

A cet effet, l'invention propose une installation de production d'enrobés à partir de granulats et d'agrégats d'enrobés recyclés, comprenant un tambour sécheur monté rotatif autour d'un axe central du tambour, le tambour possédant une extrémité relevée pour l'introduction des granulats et une extrémité abaissée, un brûleur configuré pour générer un flux de gaz chaud circulant dans le tambour de l'extrémité relevée vers l'extrémité abaissée, un ou plusieurs anneau(x) de recyclage disposé(s) le long du tambour pour l'introduction d'agrégats d'enrobés recyclés, le tambour comprenant un tronçon de séchage amont situé en amont du ou des anneau(x) recyclage et un tronçon de séchage aval situé en aval du ou des anneau(x) de recyclage, un dispositif de filtrage configuré pour filtrer des gaz chauds collectés à l'extrémité abaissée du tambour, et un malaxeur séparé du tambour et configuré pour mélanger des granulats et des agrégats d'enrobés recyclés sortant du tambour avec un liant d'apport.To this end, the invention proposes a plant for producing mixes from aggregates and aggregates of recycled mixes, comprising a drying drum rotatably mounted about a central axis of the drum, the drum having an end raised for the introduction of aggregates and a lowered end, a burner configured to generate a flow of hot gas flowing in the drum of the end raised towards the lowered end, one or more ring (s) of recycling disposed (s) along drum for the introduction of recycled asphalt aggregates, the drum comprising an upstream drying section situated upstream of the recycling ring (s) and a downstream drying section situated downstream of the ring (s) of recycling, a filter device configured to filter hot gases collected at the lowered end of the drum, and a kneader separate from the drum and configured to mix aggregates and aggregates of recycled mixes s out of the drum with a filler binder.

L'installation peut comprendre une ou plusieurs des caractéristiques optionnelles suivantes, prises isolément ou selon toutes les combinaisons techniquement possibles :

  • elle comprend une pluralité d'anneaux de recyclage disposés le long du tambour en étant espacés, le tambour comprenant un tronçon de séchage intermédiaire entre chaque paire d'anneaux de recyclage adjacents ;
  • elle comprend exactement deux anneaux de recyclage, le tambour comprenant un tronçon de séchage intermédiaire situé entre les deux anneaux de recyclage ;
  • elle comprend un circuit de recyclage configuré pour collecter des vapeurs de liant présentes dans le malaxeur et les réinjecter dans l'installation d'enrobage de granulats de telle manière qu'elles soient incinérées dans une flamme générée par le brûleur ;
  • le brûleur est disposé à l'entrée du tambour de manière à générer une flamme à l'intérieur du tambour ;
  • elle comprend un échangeur de chaleur configuré pour un transfert de chaleur des gaz filtrés par le dispositif de filtrage vers un comburant alimentant le brûleur ;
  • l'échangeur de chaleur est disposé entre le dispositif de filtrage et une cheminée d'évacuation des gaz filtrés vers l'atmosphère.
The installation may include one or more of the following optional features, in isolation or in any technically feasible combination:
  • it comprises a plurality of recycling rings disposed along the drum being spaced apart, the drum comprising an intermediate drying section between each pair of adjacent recycling rings;
  • it comprises exactly two recycling rings, the drum comprising an intermediate drying section located between the two recycling rings;
  • it comprises a recycling circuit configured to collect binder vapors present in the mixer and reinject them into the aggregate coating plant such that they are incinerated in a flame generated by the burner;
  • the burner is disposed at the entrance of the drum so as to generate a flame inside the drum;
  • it comprises a heat exchanger configured for a heat transfer of the gases filtered by the filtering device to an oxidant supplying the burner;
  • the heat exchanger is disposed between the filtering device and a vent stack for the filtered gases to the atmosphere.

L'invention concerne également un procédé de production d'enrobés à partir de granulats et d'agrégats d'enrobés recyclés, comprenant l'introduction de granulats dans un tambour sécheur rotatif, le tambour possédant une extrémité relevée pour l'introduction des granulats et une extrémité abaissée, la génération d'un flux de gaz chaud circulant dans le tambour de l'extrémité relevée vers l'extrémité abaissée, l'introduction d'agrégats d'enrobés dans le tambour via un ou plusieurs anneau(x) de recyclage disposé(s) le long du tambour, le tambour comprenant un tronçon de séchage amont situé en amont du ou des anneau(x) recyclage et un tronçon de séchage aval situé en aval du ou des anneau(x) de recyclage, la récupération et le filtrage des gaz chauds sortant du tambour dans un dispositif de filtrage, et le mélange de granulats et d'agrégats d'enrobés avec un liant d'apport dans un malaxeur séparé du tambour.The invention also relates to a method for producing asphalt from aggregates and recycled asphalt aggregates, comprising introducing granules into a rotary drying drum, the drum having a raised end for the introduction of aggregates and a lowered end, the generation of a flow of hot gas flowing in the drum of the end raised towards the lowered end, the introduction of asphalt aggregates into the drum via one or more ring (s) of recycling disposed along the drum, the drum comprising an upstream drying section located upstream of the ring (s) recycling and a downstream drying section located downstream of the ring (s) recycling, recovery and filtering hot gases exiting the drum in a filter device, and mixing aggregates and asphalt aggregates with a binder in a kneader separate from the drum.

Le procédé peut comprendre une ou plusieurs des caractéristiques optionnelles suivantes, prises isolément ou selon toutes les combinaisons techniquement possibles :

  • il comprend l'introduction d'agrégats d'enrobés via plusieurs anneaux de recyclage, le tambour possédant un tronçon de séchage intermédiaire entre chaque paire d'anneaux de recyclage adjacents,
  • une première fraction d'agrégats d'enrobés introduite via un anneau de recyclage amont possède une teneur en liant inférieure à celle d'une deuxième fraction d'agrégats d'enrobés introduite via un anneau de recyclage aval.
The method may include one or more of the following optional features, taken singly or in any technically feasible combination:
  • it comprises the introduction of asphalt aggregates via a plurality of recycling rings, the drum having an intermediate drying section between each pair of adjacent recycling rings,
  • a first fraction of asphalt aggregates introduced via an upstream recycling ring has a binder content lower than that of a second fraction of asphalt aggregates introduced via a downstream recycling ring.

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 annexé, sur lesquels les Figures 1 et 2 sont des vues d'ensemble schématiques d'installations de production d'enrobés.The invention and its advantages will be better understood on reading the description which will follow, given solely by way of example, and with reference to the appended drawings, in which the Figures 1 and 2 are schematic overviews of asphalt plants.

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

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

L'installation 2 comprend un tambour 4 pour le séchage de granulats par circulation d'un flux de gaz dans le tambour 4.The installation 2 comprises a drum 4 for drying aggregates by circulating a flow of gas in the drum 4.

Le tambour 4 s'étend suivant un axe central A et est monté rotatif autour de son axe central A. L'axe central A est incliné d'un angle non nul par rapport au plan horizontal. L'angle d'inclinaison de l'axe central A par rapport au plan horizontal est par exemple compris entre 2° et 6°.The drum 4 extends along a central axis A and is rotatably mounted about its central axis A. The central axis A is inclined at a non-zero angle with respect to the horizontal plane. The angle of inclination of the central axis A with respect to the horizontal plane is for example between 2 ° and 6 °.

Le tambour 4 possède donc une extrémité relevée 4A et une extrémité abaissée 4B. L'extrémité relevée 4A est située à un niveau supérieur à celui de l'extrémité abaissée 4B.The drum 4 thus has a raised end 4A and a lowered end 4B. The raised end 4A is located at a level higher than that of the lowered end 4B.

L'extrémité relevée 4A définit une entrée pour les granulats frais et l'extrémité abaissée 4B définit une sortie pour un mélange formé des granulats G et d'agrégats d'enrobés AE recyclés introduits dans le tambour 4.The raised end 4A defines an inlet for the fresh aggregates and the lowered end 4B defines an outlet for a mixture formed of aggregates G and aggregates of recycled AE mixes introduced into the drum 4.

L'installation 2 comprend un dispositif d'alimentation 6 configuré pour alimenter l'extrémité relevée 4A du premier tambour 4 en granulats G frais.The installation 2 comprises a feed device 6 configured to feed the raised end 4A of the first drum 4 in fresh G granules.

Lors de la rotation du tambour 4, du fait de l'inclinaison de celui-ci, les granulats G introduits dans l'extrémité relevée 4A du tambour 4 avancent progressivement vers l'extrémité abaissée 4B du tambour 4.During the rotation of the drum 4, because of the inclination thereof, the aggregates G introduced into the raised end 4A of the drum 4 progressively advance towards the lowered end 4B of the drum 4.

Dans la suite, les termes « aval » et « amont » s'entendent par rapport au sens de circulation des granulats G dans le tambour 4, de l'extrémité relevée 4A vers l'extrémité abaissée 4B.In the following, the terms "downstream" and "upstream" refer to the direction of flow of the aggregates G in the drum 4, from the raised end 4A to the lowered end 4B.

L'installation 2 comprend un dispositif de génération de gaz chauds 8 configuré pour générer des gaz chauds et pour faire circuler les gaz chauds dans le tambour 4 de l'extrémité relevée 4A vers l'extrémité abaissée 4B, i.e. dans le même sens que les granulats G. Le tambour 4 est un tambour sécheur dit à « courants parallèles » ou à « co-courants ».The installation 2 comprises a device for generating hot gases 8 configured to generate hot gases and to circulate the hot gases in the drum 4 from the raised end 4A towards the lowered end 4B, ie in the same direction as the Aggregates G. The drum 4 is a drying drum said to "parallel currents" or "co-currents".

Dans l'exemple illustré, le dispositif de génération de gaz chauds 8 comprend un brûleur 10 agencé pour générer une flamme F à l'intérieur du tambour 4. Le brûleur 10 est configuré pour générer la flamme F à partir d'un carburant et d'un comburant. Le comburant est par exemple de l'air.In the illustrated example, the hot gas generating device 8 comprises a burner 10 arranged to generate a flame F inside the drum 4. The burner 10 is configured to generate the flame F from a fuel and a fuel. an oxidizer. The oxidant is for example air.

L'installation 2 comprend un ou plusieurs anneau(x) de recyclage 12, 14 disposé(s) le long du tambour 4 pour l'introduction d'agrégats d'enrobés AE à l'intérieur du tambour 4. Chaque anneau de recyclage 12, 14 est disposé le long du tambour 4 à distance de l'extrémité relevée 4A et à distance de l'extrémité abaissée 4B.The installation 2 comprises one or more recycling ring (s) 12, 14 arranged along the drum 4 for the introduction of asphalt aggregates AE inside the drum 4. Each recycling ring 12 14 is disposed along the drum 4 away from the raised end 4A and away from the lowered end 4B.

Le tambour 4 comprend plusieurs tronçons de séchage TA, TI, TB consécutifs le long du tambour 4.The drum 4 comprises several drying sections TA, TI, TB consecutive along the drum 4.

De manière connue, dans chaque tronçon de séchage TA, TI, TB, le tambour 4 est muni, sur sa surface interne, d'aubes de relevage 16 configurées pour relever les granulats G et/ou les agrégats d'enrobé AE, de manière à former, en fonctionnement, un rideau de granulats et/ou d'agrégats d'enrobés AE traversé par les gaz chauds circulant dans le tambour 4. Selon leurs profils, les aubes de relevage 16 permettent de créer, respectivement dans chaque tronçon de séchage TA, TI, TB, un rideau plus ou moins dense.In known manner, in each drying section TA, TI, TB, the drum 4 is provided on its inner surface with lifting blades 16 configured to lift the aggregates G and / or the asphalt aggregates AE, so that to form, in operation, a curtain of aggregates and / or asphalt aggregates AE traversed by the hot gases flowing in the drum 4. According to their profiles, the lifting blades 16 can create, respectively in each drying section TA, TI, TB, a curtain more or less dense.

Le tambour 4 comprend un tronçon de séchage amont TA situé en amont du ou des anneau(x) de recyclage 12, 14, et un tronçon de séchage aval TB situé en aval du ou des anneau(x) de recyclage 12, 14.The drum 4 comprises an upstream drying section TA situated upstream of the recycling ring (s) 12, 14, and a downstream drying section TB situated downstream of the recycling ring (s) 12, 14.

Seuls les granulats G sont présents dans le tronçon de séchage amont TA, les agrégats d'enrobé AE étant introduits dans le tambour 4 seulement en aval du tronçon de séchage TS.Only the aggregates G are present in the upstream drying section TA, the asphalt aggregates AE being introduced into the drum 4 only downstream of the drying section TS.

Lorsque le tambour 4 comprend plusieurs anneaux de recyclage 12, 14, le tambour 4 comprend un tronçon de séchage intermédiaire TI entre chaque paire d'anneaux de recyclage adjacents.When the drum 4 comprises a plurality of recycling rings 12, 14, the drum 4 comprises an intermediate drying section TI between each pair of adjacent recycling rings.

Le tronçon de séchage amont TA est situé en amont de l'anneau de recyclage 14 situé le plus en amont. Le tronçon de séchage aval TB est situé entre l'anneau de recyclage 14 situé le plus en aval, et l'extrémité abaissée 4 du tambour 4.The upstream drying section TA is located upstream of the recycling ring 14 located furthest upstream. The downstream drying section TB is situated between the recycling ring 14 located furthest downstream and the lowered end 4 of the drum 4.

Les gaz chauds se refroidissent progressivement le long du tambour 4 du fait des échanges de chaleur avec les granulats G et les agrégats d'enrobés AE présents dans le tambour 4. Les gaz chauds sont donc progressivement de moins en moins chauds lorsque l'on passe d'un tronçon de séchage au suivant en se déplaçant de l'amont vers l'aval du tambour 4.The hot gases cool progressively along the drum 4 because of the heat exchanges with the aggregates G and aggregates of AE mixes present in the drum 4. The hot gases are progressively less and less hot when passing from one drying section to the next while moving from upstream to downstream of the drum 4.

La prévision d'une pluralité d'anneaux de recyclage 12, 14 espacés le long du tambour 4 permet d'introduire les agrégats d'enrobé AE dans le tambour 4 sélectivement via un ou plusieurs anneau(x) parmi la pluralité d'anneaux de recyclage 12, 14.The provision of a plurality of recycling rings 12, 14 spaced along the drum 4 makes it possible to introduce the asphalt aggregates AE into the drum 4 selectively via one or more ring (s) among the plurality of rings of recycling 12, 14.

La température des gaz chauds baisse progressivement le long du tambour 4 du fait des échanges thermiques, notamment avec les granulats G.The temperature of the hot gases gradually decreases along the drum 4 because of the heat exchange, in particular with the granules G.

Il est possible d'introduire la totalité des agrégats d'enrobés AE sélectivement via un seul parmi la pluralité d'anneaux de recyclage 12, 14. Ceci permet de soumettre les agrégats d'enrobés AE à des gaz chaud à une température plus ou moins élevée, en fonction par exemple de la teneur en liant des agrégats d'enrobés AE.It is possible to introduce all the asphalt aggregates AE selectively via only one of the plurality of recycling rings 12, 14. This makes it possible to subject the aggregates of AE mixes to hot gases at a temperature more or less depending, for example, on the binder content of AE asphalt aggregates.

Il est possible d'introduire des fractions d'agrégats d'enrobés distinctes via plusieurs anneaux de recyclage choisis parmi la pluralité d'anneaux de recyclage, chaque fraction d'agrégats d'enrobés étant introduite via un anneau de recyclage respectif.Separate asphalt aggregate fractions can be introduced via a plurality of recycling rings selected from the plurality of recycle rings, each asphalt aggregate fraction being introduced via a respective recycle ring.

Une fraction d'agrégats d'enrobés introduite plus en amont sera soumise à des gaz chauds à une température plus élevée que celle des gaz chauds à laquelle est soumise une fraction d'agrégats d'enrobés introduite plus en aval. Ceci permet par exemple de soumettre des fractions d'agrégats d'enrobés possédant des teneurs en liant différentes à des gaz chaud à des températures différentes.A fraction of asphalt aggregates introduced further upstream will be subjected to hot gases at a higher temperature than that of the hot gases to which is subjected a fraction of asphalt aggregates introduced further downstream. This allows for example to subject asphalt aggregate fractions having different binder contents to hot gases at different temperatures.

Dans l'exemple de la Figure 1, le tambour 4 comprend exactement deux anneaux de recyclage 12, 14 délimitant entre eux un tronçon de séchage intermédiaire TI. Le tambour 4 comprend, de l'amont vers l'aval, le tronçon de séchage amont TA, le tronçon de séchage intermédiaire TI et le tronçon se séchage aval TB.In the example of the Figure 1 the drum 4 comprises exactly two recycling rings 12, 14 delimiting between them an intermediate drying section TI. The drum 4 comprises, from upstream to downstream, the upstream drying section TA, the intermediate drying section TI and the downstream drying section TB.

L'installation 2 est configurée pour l'introduction dans le tambour 4, sélectivement, de la totalité des agrégats d'enrobés AE via l'anneau de recyclage 12 situé en amont, de la totalité des agrégats d'enrobé AE via l'anneau de recyclage 14 situé en aval ou d'une première fraction d'agrégats d'enrobés AE1 et une deuxième fraction d'agrégats d'enrobés AE2 via respectivement l'anneau de recyclage 12 situé en amont et de l'anneau de recyclage 14 situé en aval.The installation 2 is configured for the introduction into the drum 4, selectively, of all asphalt aggregates AE via the upstream recycling ring 12, of all the asphalt aggregates AE via the ring. 14 or downstream of a first fraction of asphalt aggregates AE1 and a second fraction of asphalt aggregates AE2 via respectively the recycling ring 12 located upstream and the recycling ring 14 located downstream.

La première fraction d'agrégats d'enrobés AE1 et la deuxième fraction d'agrégats d'enrobésAE2 possèdent par exemple des teneurs en liant différentes.The first fraction of asphalt aggregates AE1 and the second fraction of asphalt aggregates AE2 have, for example, different binder contents.

De préférence, la première fraction d'agrégats d'enrobés AE1 introduite plus en amont possèdent une teneur en liant inférieure à celle de la deuxième fraction d'agrégats d'enrobés AE2 introduite plus en aval.Preferably, the first fraction of asphalt aggregates AE1 introduced further upstream have a binder content lower than that of the second fraction of asphalt aggregates AE2 introduced further downstream.

Les gaz chauds étant de moins en moins chauds le long du tambour 4, ceci permet d'exposer la deuxième fraction d'agrégats d'enrobés AE2 ayant la plus forte teneur en liant à des gaz chauds à une température plus modérée, limitant ainsi la génération de vapeur de liant.The hot gases being less and less hot along the drum 4, this makes it possible to expose the second fraction of aggregates AE2 with the highest binder content to hot gases at a more moderate temperature, thus limiting the binder vapor generation.

Le tambour 4 est dépourvu de tronçon de malaxage configuré pour le malaxage des granulats G et des agrégats d'enrobé AE.The drum 4 does not have a kneading section configured for kneading aggregates G and asphalt aggregates AE.

L'installation d'enrobage de granulats 2 comprend un malaxeur 20 externe configuré pour malaxer le mélange de granulats G et d'agrégats d'enrobés AE sortant du tambour 4, à l'extrémité abaissée 4B de celui-ci.The aggregate coating plant 2 comprises an external kneader configured to knead the mixture of aggregates G and asphalt aggregates AE exiting the drum 4 at the lowered end 4B thereof.

Le malaxeur 20 est distinct et séparé du tambour 4. Il reçoit le mélange de granulats G et d'agrégats d'enrobés AE après que celui-ci soit sorti du tambour 4.The kneader 20 is distinct and separated from the drum 4. It receives the mixture of aggregates G and asphalt aggregates AE after it has emerged from the drum 4.

Les agrégats d'enrobé AE mélangés aux granulats G contiennent déjà du liant, dit « liant de recyclage », provenant des agrégats d'enrobé AE. Il peut s'avérer nécessaire d'apporter également du liant supplémentaire, dit « liant d'apport ». Le liant d'apport est par exemple du bitume.The asphalt aggregates AE mixed with the aggregates G already contain binder, called "recycling binder", from the asphalt aggregates AE. It may be necessary to also provide additional binder, called "binder". The binder is, for example, bitumen.

L'installation 2 comprend un dispositif d'alimentation en liant d'apport 22 pour introduire du liant d'apport dans le malaxeur 20.The installation 2 comprises a delivery binder supply device 22 for introducing the binder into the mixer 20.

En option, l'installation 2 comprend un circuit de recyclage 24, configuré pour collecter des vapeurs de liant présentes dans le malaxeur 20 et pour les réinjecter dans l'installation 2 de telle manière que les vapeurs de liant sont incinérées dans la flamme F du brûleur 10.Optionally, the installation 2 comprises a recycling circuit 24, configured to collect binder vapors present in the mixer 20 and to reinject them into the plant 2 so that the binder vapors are incinerated in the flame F of the burner 10.

Le circuit de recyclage 24 est ici configuré pour réinjecter les vapeurs de liant dans le tambour 4, en amont de la flamme F générée par le brûleur 10, de sorte que les vapeurs de liant sont incinérées dans la flamme F.The recycling circuit 24 is here configured to reinject the binder vapors in the drum 4, upstream of the flame F generated by the burner 10, so that the binder vapors are incinerated in the flame F.

Plus spécifiquement, le circuit de recyclage 24 est ici configuré pour réinjecter les vapeurs de liant dans le tambour 4, à l'extrémité relevée 4A du tambour 4.More specifically, the recycling circuit 24 is here configured to reinject the binder vapors into the drum 4, at the raised end 4A of the drum 4.

L'installation 2 comprend un collecteur de gaz 26 agencé à l'extrémité abaissée 4B du tambour 4 pour collecter les gaz chauds sortant du tambour 4, et un dispositif de filtrage 28 relié fluidiquement au collecteur de gaz 26 pour filtrer les gaz collectés par le collecteur de gaz 26. Le dispositif de filtrage 28 est par exemple un filtre à manches.The installation 2 comprises a gas collector 26 arranged at the lowered end 4B of the drum 4 to collect the hot gases leaving the drum 4, and a filtering device 28 fluidly connected to the gas collector 26 for filtering the gases collected by the gas collector 26. The filter device 28 is for example a bag filter.

La prévision d'un malaxeur 20 externe, distinct et séparé du tambour 4, évite d'exposer le liant d'apport aux gaz chauds et permet de collecter les vapeurs de liant générées dans le malaxeur 20 et les gaz chaud sortant du tambour 4 séparément. En particulier, le collecteur de gaz 26 et le circuit de recyclage 24 sont distincts et séparés.The provision of an external mixer, separate and separate from the drum 4, avoids exposing the supply binder to the hot gases and makes it possible to collect the binder vapors generated in the mixer 20 and the hot gases leaving the drum 4 separately. . In particular, the gas manifold 26 and the recycling circuit 24 are separate and separate.

En option, l'installation 2 comprend un échangeur de chaleur 30 disposé en aval du dispositif de filtrage 28 est configuré pour un échange de chaleur entre les gaz chauds filtrés par le dispositif de filtrage 28 et un comburant alimentant le brûleur 10. Le comburant est ici de l'air.Optionally, the installation 2 comprises a heat exchanger 30 disposed downstream of the filtering device 28 is configured for a heat exchange between the hot gases filtered by the filtering device 28 and an oxidant supplying the burner 10. The oxidant is here air.

L'échangeur de chaleur 30 est à flux séparés. Les gaz chauds et le comburant ne sont pas en contact lors de l'échange de chaleur. Ils échangent de la chaleur à travers une ou plusieurs parois.The heat exchanger 30 has separate flows. The hot gases and the oxidant are not in contact during the heat exchange. They exchange heat through one or more walls.

L'échangeur de chaleur 30 est ici un échange de chaleur gaz/gaz, configuré pour un échange de chaleur entre les gaz chauds filtrés et le comburant qui est à l'état gazeux.The heat exchanger 30 is here a gas / gas heat exchange, configured for a heat exchange between the filtered hot gases and the oxidizer which is in the gaseous state.

De préférence, l'installation 2 comprend une cheminée 32 pour l'évacuation des gaz chauds filtrés dans l'atmosphère. La cheminée 32 est ici disposée en aval de l'échangeur de chaleur 30.Preferably, the installation 2 comprises a chimney 32 for the evacuation of the hot gases filtered in the atmosphere. The chimney 32 is here disposed downstream of the heat exchanger 30.

Dans un mode de réalisation dans lequel l'installation 2 est dépourvue d'échangeur de chaleur 30, la cheminée 32 est par exemple disposée directement en aval du dispositif de filtrage 28.In an embodiment in which the installation 2 is devoid of a heat exchanger 30, the chimney 32 is for example arranged directly downstream of the filtering device 28.

En fonctionnement, le tambour 4 est entraîné en rotation autour de son axe central A et les gaz chauds générés par le brûleur 10 circulent dans le tambour 4 de l'extrémité relevée 4A vers l'extrémité abaissée 4B.In operation, the drum 4 is rotated about its central axis A and the hot gases generated by the burner 10 flow in the drum 4 from the raised end 4A to the lowered end 4B.

Du fait de la rotation du tambour 4 et de son inclinaison, les granulats G et les agrégats d'enrobés AE1, AE2 introduits dans le tambour 4 avancent progressivement de l'extrémité relevée 4A vers l'extrémité abaissée du tambour 4.Due to the rotation of the drum 4 and its inclination, the aggregates G and the asphalt aggregates AE1, AE2 introduced into the drum 4 progressively advance from the raised end 4A towards the lowered end of the drum 4.

Les granulats G sont introduits à l'extrémité relevée 4A du tambour 4. Ils sont d'abord séchés seuls dans le tronçon de séchage amont TA. Ils sont ensuite mélangés avec des agrégats d'enrobés AE introduits dans le tambour 4 via un ou plusieurs anneaux de recyclage 12, 14, qui sont mélangés et séchés avec les granulats dans le ou chaque éventuel tronçon de séchage intermédiaire TI et dans le tronçon de séchage aval TB.Aggregates G are introduced at the raised end 4A of drum 4. They are first dried alone in the upstream drying section TA. They are then mixed with asphalt aggregates AE introduced into the drum 4 via one or more recycling rings 12, 14, which are mixed and dried with the aggregates in the or each optional intermediate drying section TI and in the downstream drying section TB.

Les granulats G et les agrégats d'enrobés AE mélangés et séchés ressortent du tambour 4 par l'extrémité abaissée 4B. Les granulats G et les agrégats d'enrobé AE sont malaxés dans le malaxeur 20, avec du liant d'apport.Aggregates G and aggregates of mixes AE mixed and dried out of the drum 4 by the lowered end 4B. The aggregates G and the asphalt aggregates AE are kneaded in the kneader 20, with the binder.

Les gaz chaud sont collectés à l'extrémité abaissée 4 du tambour 4 par le collecteur de gaz 26, puis filtrés par le dispositif de filtrage 28.The hot gases are collected at the lowered end 4 of the drum 4 by the gas manifold 26 and then filtered by the filtering device 28.

En option, un échange de chaleur est réalisé entre les gaz chaud filtrés et le comburant alimentant le brûleur 10, dans l'échangeur de chaleur 30.Optionally, a heat exchange is carried out between the filtered hot gases and the oxidant supplying the burner 10, in the heat exchanger 30.

En option, les vapeurs de liant récupérées dans le malaxeur 20 sont réintroduites dans l'installation 2 de manière à être incinérées par la flamme F du brûleur 10.Optionally, the binder vapors recovered in the mixer 20 are reintroduced into the plant 2 so as to be incinerated by the flame F of the burner 10.

Dans le tambour 4, la température de gaz chauds diminue de l'amont vers l'aval du fait des échanges de chaleurs avec les granulats G et les agrégats d'enrobés AE.In the drum 4, the temperature of hot gases decreases from upstream to downstream due to heat exchanges with the aggregates G and asphalt aggregates AE.

L'introduction d'agrégats d'enrobés AE en aval du tronçon de séchage amont TA dans un tambour 4 à courant parallèle permet d'exposer les agrégats d'enrobés AE à des gaz chaud à une température modérée par rapport à celle des gaz chauds généré par le brûleur 10. En outre, lorsque la flamme F est générée à l'intérieur du tambour 4, le rideau de granulats formé dans le tronçon de séchage amont TA du fait de la rotation du tambour 4 protège les agrégats d'enrobés AE des radiations de la flamme F. Ceci limite les émissions de vapeurs de liant par les agrégats d'enrobés AE.The introduction of AE asphalt aggregates downstream of the upstream drying section TA in a parallel flow drum 4 makes it possible to expose the aggregates of AE mixes to hot gases at a moderate temperature relative to that of the hot gases. generated by the burner 10. In addition, when the flame F is generated inside the drum 4, the curtain of aggregates formed in the upstream drying section TA due to the rotation of the drum 4 protects the asphalt aggregates AE This limits the emissions of binder vapors by the asphalt aggregates AE.

Lorsqu'une pluralité d'anneaux de recyclage 12, 14 sont prévus, la température des gaz chauds dans les tronçons de séchages successifs diminue progressivement. L'utilisation sélectivement d'un ou plusieurs anneaux de recyclage parmi la pluralité d'anneaux de recyclage 12, 14 permet d'exposer les agrégats d'enrobés AE à des gaz chauds à une température plus ou moins élevée, et/ou différentes fractions d'agrégats d'enrobé à des gaz chauds à des températures différentes. Ceci permet d'exposer des agrégats d'enrobés AE ayant une plus forte teneur en liant à des gaz chauds à température très modérée, limitant encore les émissions de vapeurs de liant par les agrégats d'enrobé AE.When a plurality of recycling rings 12, 14 are provided, the temperature of the hot gases in the successive drying sections gradually decreases. The selective use of one or more recycling rings among the plurality of recycling rings 12, 14 makes it possible to expose the aggregates of AE mixes to hot gases at a higher or lower temperature, and / or different fractions. of asphalt aggregates to hot gases at different temperatures. This makes it possible to expose aggregates of AE mixes having a higher binder content to hot gases at a very moderate temperature, further limiting the binder vapor emissions by the asphalt aggregates AE.

Le malaxeur 20 séparé du tambour 4 permet d'apporter du liant d'apport à l'extérieur du tambour 4, ce liant d'apport n'étant pas exposé aux gaz chauds. En outre, les vapeurs de liant générées dans le malaxeur 20 ne sont pas emportées vers le dispositif de filtrage 28 et ne sont pas in fine rejetée dans l'atmosphère. Ainsi, le malaxeur 20 séparé limite les vapeurs de liant dans les gaz chaud collectés en sortie du tambour 4.The kneader 20 separated from the drum 4 makes it possible to supply binder to the outside of the drum 4, this filler binder not being exposed to the hot gases. In addition, the binder vapors generated in the mixer 20 are not carried to the filter device 28 and are not ultimately released into the atmosphere. Thus, the separate kneader 20 limits the binder vapors in the hot gases collected at the outlet of the drum 4.

Lorsqu'un échangeur de chaleur 30 est prévu, la diminution des vapeurs de liant dans les gaz chauds collectés en sortie du tambour 4 limite le risque d'encrassement de l'échangeur de chaleur 30 et préserve son efficacité.When a heat exchanger 30 is provided, the reduction of the binder vapors in the hot gases collected at the outlet of the drum 4 limits the risk of clogging of the heat exchanger 30 and preserves its effectiveness.

L'échangeur de chaleur 30 permet de récupérer une partie de l'énergie des gaz chauds sortant dans le tambour 4 et de la réinjecter dans le tambour 4. Il permet d'augmenter le rendement du brûleur 10, et donc le rendement de l'installation 2.The heat exchanger 30 makes it possible to recover a portion of the energy of the hot gases exiting in the drum 4 and reinject it into the drum 4. It makes it possible to increase the efficiency of the burner 10, and therefore the efficiency of the installation 2.

Ainsi, l'installation d'enrobage de granulats 2 permet d'obtenir un taux de recyclage important tout en limitant les émissions polluantes.Thus, the aggregate coating plant 2 provides a high recycling rate while limiting pollutant emissions.

L'installation 2 de la Figure 2 diffère de celle de la Figure 1 en ce qu'elle comprend un seul anneau de recyclage 12. Le tambour 4 possède exactement deux tronçons de mélange, à savoir le tronçon de séchage amont TA, situé en amont de l'anneau de recyclage 12, et le tronçon de séchage aval TB situé entre l'anneau de recyclage 12 et l'extrémité abaissée 4B du tambour 4. Les agrégats d'enrobés AE sont introduits dans le tambour 4 par l'intermédiaire de l'anneau de recyclage 12.Installation 2 of the Figure 2 differs from that of Figure 1 in that it comprises a single recycling ring 12. The drum 4 has exactly two mixing sections, namely the upstream drying section TA, situated upstream of the recycling ring 12, and the downstream drying section TB located between the recycling ring 12 and the lowered end 4B of the drum 4. The asphalt aggregates AE are introduced into the drum 4 via the recycling ring 12.

La prévision d'une pluralité d'anneaux de recyclage 12, 14 le long d'un tambour sécheur est avantageuse indépendamment de la configuration particulière de l'installation 2 décrite ci-dessus.The provision of a plurality of recycling rings 12, 14 along a drying drum is advantageous regardless of the particular configuration of the plant 2 described above.

Ainsi, de manière générale, l'invention concerne également une installation de production d'enrobés, comprenant au moins un tambour sécheur monté rotatif autour d'un axe central incliné d'un angle non nul par rapport à un plan horizontal, le tambour présentant une extrémité relevée et une extrémité abaissée, un brûleur configuré pour générer un flux de gaz chaud circulant dans le tambour, et une pluralité d'anneaux de recyclage disposés le long du tambour en étant espacés, pour l'introduction d'agrégats d'enrobé à l'intérieur du tambour via un ou plusieurs parmi la pluralité d'anneaux de recyclage, le tambour comprenant un tronçon de séchage intermédiaire entre chaque paire d'anneaux de recyclage adjacents.Thus, in general, the invention also relates to a plant for producing asphalt, comprising at least one drying drum rotatably mounted about a central axis inclined at a non-zero angle with respect to a horizontal plane, the drum having a raised end and a lowered end, a burner configured to generate a flow of hot gas circulating in the drum, and a plurality of recycling rings disposed along the drum at a spaced distance, for the introduction of asphalt aggregates within the drum via one or more of the plurality of recycling rings, the drum comprising an intermediate drying section between each pair of adjacent recycling rings.

Par ailleurs, la prévision d'un échangeur de chaleur 30 agencé pour un échange de chaleur entre des gaz chaud provenant du tambour 4 et un comburant, par exemple de l'air, alimentant le brûleur 10, est avantageuse indépendamment de la configuration particulière de l'installation 2 décrite ci-dessus.Furthermore, the provision of a heat exchanger 30 arranged for heat exchange between hot gases from the drum 4 and an oxidizer, for example air, supplying the burner 10, is advantageous regardless of the particular configuration of the heat exchanger. the installation 2 described above.

Ainsi, de manière générale, l'invention concerne également une installation de production d'enrobés, comprenant au moins un tambour sécheur monté rotatif autour d'un axe central incliné d'un angle non nul par rapport à un plan horizontal, le tambour présentant une extrémité relevée et une extrémité abaissée, un brûleur configuré pour générer un flux de gaz chaud circulant dans le tambour, et un échangeur de chaleur agencé pour un échange de chaleur entre des gaz chauds ayant circulés dans le tambour et un comburant, par exemple de l'air, alimentant le brûleur.Thus, in general, the invention also relates to a plant for producing asphalt, comprising at least one drying drum rotatably mounted about a central axis inclined at a non-zero angle with respect to a horizontal plane, the drum having a raised end and a lowered end, a burner configured to generate a flow of hot gas flowing in the drum, and a heat exchanger arranged for heat exchange between hot gases circulating in the drum and an oxidizer, for example air, supplying the burner.

L'échangeur de chaleur peut être disposé en aval d'un dispositif de filtrage des gaz chauds ayant circulé dans le tambour, notamment entre le dispositif de filtrage et une cheminée d'évacuation des gaz chauds.The heat exchanger may be disposed downstream of a device for filtering hot gases circulating in the drum, in particular between the filtering device and a hot gas evacuation chimney.

Le tambour peut être à co-courant, le flux de gaz circulant dans le même sens que les granulats, i.e. de l'extrémité relevée vers l'extrémité abaissée, ou à contre-courant, le flux de gaz circulant en sens opposé des granulats, i.e. de l'extrémité abaissée vers l'extrémité relevée.The drum may be co-current, the flow of gas flowing in the same direction as the aggregates, ie the end raised towards the lowered end, or against the current, the flow of gas flowing in the opposite direction of the aggregates. , ie from the end lowered towards the raised end.

Le tambour peut être un tambour sécheur associé à un malaxeur séparé, ou un tambour sécheur-malaxeur comprenant un tronçon de malaxage prévu pour le mélange des granulats et d'éventuels agrégats d'enrobés introduit dans le tambour avec un liant d'apport.The drum may be a drying drum associated with a separate kneader, or a dryer-kneader drum comprising a kneading section intended for mixing the aggregates and any asphalt aggregates introduced into the drum with a filler.

L'installation d'enrobage de granulats peut comprend en option au moins un anneau de recyclage agencé le long du tambour pour l'introduction d'agrégats d'enrobé à l'intérieur du tambour. L'installation d'enrobage de granulats peut comprend par exemple plusieurs anneaux de recyclage, par exemple deux anneaux de recyclage.The aggregate coating plant may optionally include at least one recycling ring arranged along the drum for the introduction of asphalt aggregates into the drum. The aggregate coating plant may for example comprise a plurality of recycling rings, for example two recycling rings.

Claims (10)

Installation de production d'enrobés à partir de granulats (G) et d'agrégats d'enrobés (AE) recyclés, comprenant - un tambour (4) sécheur monté rotatif autour d'un axe central (A) du tambour (4), le tambour (4) possédant une extrémité relevée (4A) pour l'introduction des granulats et une extrémité abaissée (4B), - un brûleur (10) configuré pour générer un flux de gaz chaud circulant dans le tambour (4) de l'extrémité relevée (4A) vers l'extrémité abaissée (4B), - un ou plusieurs anneau(x) de recyclage (12, 14) disposé(s) le long du tambour (4) pour l'introduction d'agrégats d'enrobés (AE) recyclés, le tambour (4) comprenant un tronçon de séchage amont (TA) situé en amont du ou des anneau(x) recyclage (12, 14) et un tronçon de séchage aval (TB) situé en aval du ou des anneau(x) de recyclage (12, 14), le tambour (4) étant muni, dans chaque tronçon de séchage (TA, TB), sur sa surface interne, d'aubes de relevage (16) configurées pour relever les granulats (G) et/ou les agrégats d'enrobé (AE), de manière à former, en fonctionnement, un rideau de granulats (G) et/ou d'agrégats d'enrobés (AE) traversé par les gaz chauds circulant dans le tambour (4) ; - un dispositif de filtrage (28) configuré pour filtrer des gaz chauds collectés à l'extrémité abaissée (4B) du tambour (4), et - un malaxeur (20) séparé du tambour (4) et configuré pour mélanger des granulats (G) et des agrégats d'enrobés (AE) recyclés sortant du tambour (4) avec un liant d'apport. Asphalt mix plant from aggregates (G) and recycled asphalt aggregates (RAP), comprising - a drum (4) mounted rotatably mounted about a central axis (A) of the drum (4), the drum (4) having a raised end (4A) for the introduction of aggregates and a lowered end (4B), a burner (10) configured to generate a flow of hot gas flowing in the drum (4) from the raised end (4A) towards the lowered end (4B), one or more recycling rings (12, 14) arranged along the drum (4) for the introduction of recycled asphalt aggregates (AE), the drum (4) comprising a section of upstream drying (TA) located upstream of the ring (s) recycling (12, 14) and a downstream drying section (TB) located downstream of the recycling ring (s) (12, 14), the drum (4) being provided, in each drying section (TA, TB), on its inner surface with lifting blades (16) configured to lift the aggregates (G) and / or the asphalt aggregates (AE), in order to form, in operation, a curtain of aggregates (G) and / or aggregates of mixes (AE) traversed by the hot gases circulating in the drum (4); a filtering device (28) configured to filter hot gases collected at the lowered end (4B) of the drum (4), and - A mixer (20) separate from the drum (4) and configured to mix aggregates (G) and recycled asphalt aggregates (AE) exiting the drum (4) with a binder. Installation de production d'enrobés selon la revendication 1, comprenant une pluralité d'anneaux de recyclage (12, 14) disposés le long du tambour (4) en étant espacés, le tambour (4) comprenant un tronçon de séchage intermédiaire (TI) entre chaque paire d'anneaux de recyclage (12, 14) adjacents.Asphalt production plant according to claim 1, comprising a plurality of recycling rings (12, 14) arranged along the drum (4) spaced apart, the drum (4) comprising an intermediate drying section (TI) between each pair of adjacent recycling rings (12, 14). Installation de production d'enrobés selon la revendication 2, comprenant exactement deux anneaux de recyclage (12, 14), le tambour (4) comprenant un tronçon de séchage intermédiaire (TI) situé entre les deux anneaux de recyclage (12, 14).Asphalt production plant according to claim 2, comprising exactly two recycling rings (12, 14), the drum (4) comprising an intermediate drying section (TI) located between the two recycling rings (12, 14). Installation de production d'enrobés selon l'une quelconque des revendications précédentes, comprenant un circuit de recyclage (24) configuré pour collecter des vapeurs de liant présentes dans le malaxeur (20) et les réinjecter dans l'installation d'enrobage de granulats de telle manière qu'elles soient incinérées dans une flamme générée par le brûleur (10).Asphalt production plant according to any one of the preceding claims, comprising a recycling circuit (24) configured to collect binder vapors present in the mixer (20) and reinject them into the coating plant of granular aggregates. such that they are incinerated in a flame generated by the burner (10). Installation de production d'enrobés selon l'une quelconque des revendications précédentes, dans laquelle le brûleur (10) est disposé à l'entrée du tambour (4) de manière à générer une flamme à l'intérieur du tambour (4).Asphalt production plant according to any one of the preceding claims, wherein the burner (10) is arranged at the inlet of the drum (4) so as to generate a flame inside the drum (4). Installation de production d'enrobés selon l'une quelconque des revendications précédentes, comprenant un échangeur de chaleur (30) configuré pour un transfert de chaleur des gaz filtrés par le dispositif de filtrage (28) vers un comburant alimentant le brûleur (10).An asphalt plant according to any one of the preceding claims, comprising a heat exchanger (30) configured for heat transfer of gases filtered by the filtering device (28) to an oxidant supplying the burner (10). Installation de production d'enrobés selon la revendication 6, dans laquelle l'échangeur de chaleur (300) est disposé entre le dispositif de filtrage (28) et une cheminée (32) d'évacuation des gaz filtrés vers l'atmosphère.Asphalt production plant according to claim 6, wherein the heat exchanger (300) is disposed between the filter device (28) and a stack (32) for discharging gases filtered to the atmosphere. Procédé de production d'enrobés à partir de granulats (G) et d'agrégats d'enrobés (AE) recyclés, comprenant - l'introduction de granulats dans un tambour (4) sécheur rotatif, le tambour (4) possédant une extrémité relevée (4A) pour l'introduction des granulats et une extrémité abaissée (4B), - la génération d'un flux de gaz chaud circulant dans le tambour (4) de l'extrémité relevée (4A) vers l'extrémité abaissée (4B), - l'introduction d'agrégats d'enrobés (AE) dans le tambour (4) via un ou plusieurs anneau(x) de recyclage disposé(s) le long du tambour (4), le tambour (4) comprenant un tronçon de séchage amont (TA) situé en amont du ou des anneau(x) recyclage (12, 14) et un tronçon de séchage aval (TB) situé en aval du ou des anneau(x) de recyclage (12, 14), le tambour (4) étant muni, dans chaque tronçon de séchage (TA, TB), sur sa surface interne, d'aubes de relevage (16) configurées pour relever les granulats (G) et/ou les agrégats d'enrobé (AE), de manière à former, en fonctionnement, un rideau de granulats (G) et/ou d'agrégats d'enrobés (AE) traversé par les gaz chauds circulant dans le tambour (4) ; - la récupération et le filtrage des gaz chauds sortant du tambour (4) dans un dispositif de filtrage (18), et - le mélange de granulats (G) et d'agrégats d'enrobés (AE) avec un liant d'apport dans un malaxeur (20) séparé du tambour (4). Process for the production of mixes from aggregates (G) and recycled asphalt aggregates (AE), comprising - The introduction of aggregates in a drum (4) rotary dryer, the drum (4) having a raised end (4A) for the introduction of aggregates and a lowered end (4B), the generation of a flow of hot gas flowing in the drum (4) from the raised end (4A) towards the lowered end (4B), - The introduction of asphalt aggregates (AE) in the drum (4) via one or more recycling ring (s) arranged (s) along the drum (4), the drum (4) comprising a section of upstream drying (TA) located upstream of the ring (s) recycling (12, 14) and a downstream drying section (TB) located downstream of the recycling ring (s) (12, 14), the drum (4) being provided, in each drying section (TA, TB), on its inner surface with lifting blades (16) configured to lift the aggregates (G) and / or the asphalt aggregates (AE), in order to form, in operation, a curtain of aggregates (G) and / or aggregates of mixes (AE) traversed by the hot gases circulating in the drum (4); recovering and filtering the hot gases leaving the drum (4) in a filtering device (18), and the mixture of aggregates (G) and asphalt aggregates (AE) with a filler binder in a kneader (20) separated from the drum (4). Procédé de production d'enrobés selon la revendication 8, comprenant l'introduction d'agrégats d'enrobés (AE) via plusieurs anneaux de recyclage (12, 14), le tambour (4) possédant un tronçon de séchage intermédiaire (TI) entre chaque paire d'anneaux de recyclage (12, 14) adjacents.A process for producing mixes according to claim 8, comprising introducing asphalt aggregates (AE) via a plurality of recycling rings (12, 14), the drum (4) having an intermediate drying section (TI) between each pair of adjacent recycling rings (12, 14). Procédé de production d'enrobés selon la revendication 9, dans lequel une première fraction d'agrégats d'enrobés (AE1) introduite via un anneau de recyclage (12) amont possède une teneur en liant inférieure à celle d'une deuxième fraction d'agrégats d'enrobés (AE2) introduite via un anneau de recyclage (14) aval.A method of producing asphalt mixes according to claim 9, wherein a first asphalt aggregate fraction (AE1) introduced via a recycling ring (12) upstream has a binder content lower than that of a second fraction of asphalt aggregates (AE2) introduced via a recycling ring (14) downstream.
EP18176605.6A 2017-06-09 2018-06-07 Facility and method for producing asphalts Active EP3412829B1 (en)

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FR1755170A FR3067371B1 (en) 2017-06-09 2017-06-09 ASPHALT PRODUCTION INSTALLATION AND PROCESS

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EP3412829A1 true EP3412829A1 (en) 2018-12-12
EP3412829B1 EP3412829B1 (en) 2020-02-12

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EP18176605.6A Active EP3412829B1 (en) 2017-06-09 2018-06-07 Facility and method for producing asphalts

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EP (1) EP3412829B1 (en)
ES (1) ES2775778T3 (en)
FR (1) FR3067371B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110280075A (en) * 2019-01-31 2019-09-27 南阳市亚龙筑路机械制造有限公司 A kind of asphalt reclamation material heating equipment and heat energy utilization method
EP4141170A1 (en) * 2021-08-26 2023-03-01 Argumat Facility for producing coatings and method of manufacturing coatings in such a facility for producing coatings

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0342125A1 (en) * 1988-05-13 1989-11-15 Ermont. C.M. Apparatus and process for preparing bituminous products
EP0437990A1 (en) * 1990-01-18 1991-07-24 Ermont. C.M. Apparatus for preparing bituminous mixtures having a direct-current and a counter-current drum and corresponding method
EP1916337A1 (en) * 2006-10-27 2008-04-30 Ap Technic Asphalt Plant Technic Device for preparing a bituminous concrete
FR2987631A1 (en) * 2012-03-05 2013-09-06 Famaro Coating plant for production of asphalt coatings for road surfaces, has introduction unit for introducing fine aggregates inside dryer such that fine aggregates mix with aggregates of asphalt coatings inside dryer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0342125A1 (en) * 1988-05-13 1989-11-15 Ermont. C.M. Apparatus and process for preparing bituminous products
EP0437990A1 (en) * 1990-01-18 1991-07-24 Ermont. C.M. Apparatus for preparing bituminous mixtures having a direct-current and a counter-current drum and corresponding method
EP1916337A1 (en) * 2006-10-27 2008-04-30 Ap Technic Asphalt Plant Technic Device for preparing a bituminous concrete
FR2987631A1 (en) * 2012-03-05 2013-09-06 Famaro Coating plant for production of asphalt coatings for road surfaces, has introduction unit for introducing fine aggregates inside dryer such that fine aggregates mix with aggregates of asphalt coatings inside dryer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110280075A (en) * 2019-01-31 2019-09-27 南阳市亚龙筑路机械制造有限公司 A kind of asphalt reclamation material heating equipment and heat energy utilization method
CN110280075B (en) * 2019-01-31 2023-09-15 河南亚龙智能装备有限公司 Asphalt reclaimed material heating equipment and heat energy utilization method
EP4141170A1 (en) * 2021-08-26 2023-03-01 Argumat Facility for producing coatings and method of manufacturing coatings in such a facility for producing coatings
FR3126432A1 (en) * 2021-08-26 2023-03-03 Argumat ASPHALT PRODUCTION FACILITY AND ASPHALT MANUFACTURING METHOD IN SUCH ASPHALT PRODUCTION FACILITY

Also Published As

Publication number Publication date
FR3067371A1 (en) 2018-12-14
EP3412829B1 (en) 2020-02-12
FR3067371B1 (en) 2021-11-26
ES2775778T3 (en) 2020-07-28

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