EP3908696A1 - Dispositif d'enrobage de granulats, procédé et utilisations - Google Patents
Dispositif d'enrobage de granulats, procédé et utilisationsInfo
- Publication number
- EP3908696A1 EP3908696A1 EP20707157.2A EP20707157A EP3908696A1 EP 3908696 A1 EP3908696 A1 EP 3908696A1 EP 20707157 A EP20707157 A EP 20707157A EP 3908696 A1 EP3908696 A1 EP 3908696A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- aggregate
- aggregates
- supply means
- coating device
- infrared emitter
- 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.)
- Withdrawn
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 51
- 239000011248 coating agent Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 claims abstract description 18
- 238000000862 absorption spectrum Methods 0.000 claims abstract description 11
- 230000005670 electromagnetic radiation Effects 0.000 claims abstract description 5
- 238000004064 recycling Methods 0.000 claims description 39
- 239000010426 asphalt Substances 0.000 claims description 33
- 239000004576 sand Substances 0.000 claims description 17
- 239000011230 binding agent Substances 0.000 claims description 6
- 230000005855 radiation Effects 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 239000004215 Carbon black (E152) Substances 0.000 claims description 4
- 229930195733 hydrocarbon Natural products 0.000 claims description 4
- 150000002430 hydrocarbons Chemical class 0.000 claims description 4
- 239000000203 mixture Substances 0.000 description 27
- 238000010438 heat treatment Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 13
- 239000000945 filler Substances 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 206010001488 Aggression Diseases 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000016571 aggressive behavior Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- -1 fines Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003921 particle size analysis Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/05—Crushing, pulverising or disintegrating apparatus; Aggregate screening, cleaning, drying or heating apparatus; Dust-collecting arrangements specially adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1009—Plant wherein type or construction of the mixer are irrelevant
Definitions
- the present invention relates to the field of coated materials intended for the production of wearing courses, bonding, base and / or foundation of roadways.
- the present invention refers to a coating device capable of recycling a substantial content of coated aggregate (AE), to a method of using the device, as well as its uses.
- AE coated aggregate
- Recycled or recovered aggregates include Aggregates d'Entrobés (AE) or "Reclaimed Asphalt Pavement” (RAP) in English.
- AE is meant a granular mixture originating from milling, crushing, demolition of plates, surplus or waste from the production of old bituminous mixes (old pavements), and entering into the composition of recycling mixes ( NF P 98-149 of June 2000).
- recycled aggregates or “recyclais”, we mean a set of grains with dimensions between 0 and 125 mm from the demolition of works or subject to reuse (NF EN 13-043 of August 2013 ).
- EAs can be distinguished between “specific aggregates” which come from a large quantity of asphalt to be recycled, generally well identified and homogeneous (single origin, archives, core samples) and “all-purpose aggregates” which come mainly from small construction sites, various demolitions or site returns.
- the latter type of EA is generally crumbled in a crusher or granulator, to be screened to a maximum dimension ranging from 10 to 20 mm, exceptionally 25 mm for recycling in bedding.
- the EAs are generally checked and characterized in order to establish a technical sheet of asphalt mixtures (FTAE) in which various information is provided: the content of residual binder, the penetrability of the residual binder, the particle size analysis of the asphalt aggregates, as well as the intrinsic characteristics of the aggregates (Los Angeles LA test, accelerated polishing coefficient test (CPA), etc.)
- FTAE technical sheet of asphalt mixtures
- the coating stations can allow either recycling to a discontinuous station (1) or recycling to a continuous station (2).
- the coating stations (also called coating plants) generally include several pre-dosers, a drying drum, an elevator, and a mixer with two horizontal and counter-rotating paddle shafts. Recycling involves heating recyclais (“aggregates”) without burning their bitumen and dosing them precisely in the final mixture.
- Recyclers (minimum 5%) are sent to the drying drum with new aggregates. This method is very rarely used, because if there is recovery of aggregates, the old bitumen is incinerated and therefore lost.
- the recyclates are added to the new aggregates previously overheated in the drying drum.
- the drying and heating of recycled asphalt is carried out by conduction in the elevator and it is necessary to extend the manufacturing cycle.
- This method is simple and requires little investment.
- overheating of virgin aggregates up to more than 200 ° C
- this overheating can degrade some types of aggregates superficially, producing a significant amount of ultrafine.
- its effectiveness is quickly limited by the humidity of the recyclers and the vaporization in the hot elevator.
- the maximum recycling rate is 10% with dry recyclers. It cannot generally exceed 5% if they are wet.
- Recyclers can also be added to the drying drum via a launcher mat installed on the front of the drying drum, or via a recycling ring mounted on the drying drum.
- the maximum recycling time obtained using this technique depends on the type of installation. It can be from 10% (very wet recyclers) to 25% (dry recyclers) for a standard dryer combined with a pitcher mat, from 15% (very wet recyclers) to 25% (dry recyclers) for an extended dryer combined with a pitcher mat, or from 20% (very wet recyclers) to 35% (dry recyclers) for an extended dryer combined with a recycling ring.
- Recyclers are introduced via a weighing hopper which opens directly into the mixer. This method allows a recycling rate of up to 10% with very humid recyclers, 20% with dry recyclers. It is sometimes combined with the introduction of recycled materials into the drying drum, in which case the total recycling rate can reach 30 to 50%, depending on the humidity of the recycled materials.
- Some stationary power stations are equipped with two drying drums. Recyclers are dried and preheated to around 120 ° C in a parallel drum operating as an Equicurrent Drying-Coating Drum (TSE). They are stored in a thermally insulated silo, then dosed and sent to the mixer. At the same time, the virgin aggregates are overheated in the counter-current dryer drum. After dosing, they are sent to the mixer and homogenized with the recycled material and the feed bitumen. In this type of installation, the maximum recycling rate is 35 to 40%, when the recyclers are very humid. It reaches 60% with dry recyclais. However, this technique has the disadvantage of being energy consuming and being quite expensive.
- TSE Equicurrent Drying-Coating Drum
- the coating stations are mainly equipped with TSE (s) which operate (s) at counter-current or counter-current.
- Recyclers are introduced into the central part of the drum by a recycling ring.
- the recyclers are first continuously dosed, then dried and heated by the hot gases from the burner present in the TSE and by the virgin aggregates superheated in the first part of the tube.
- Recyclers are protected from the burner flame by the screen formed by the virgin aggregates thanks to the arrangement of the buckets located inside the TSE in the form of a tube.
- Virgin aggregates and recyclates are then homogenized in particle size and temperature. The mixture then passes into the kneading zone, where the bitumen and the filler filler are injected.
- the maximum recycling rate depends on the humidity of the constituents and the target temperature level for the final product; it is generally 20 to 30%.
- the recyclates are introduced by a recycling ring positioned a little further than the middle of the tube. They are automatically protected from the burner flame. They are then mixed with the virgin aggregates previously overheated in the upstream part of the drum. The bitumen and the feed filler arrive a little downstream. The whole then passes into the mixing zone.
- the maximum recycling rate varies from 30 to 50% depending on the humidity of the recyclates and the temperature of the final mixture.
- the "double drum” station is a variant of counter-current TSE, widely used in the United States, among others, under the name of "Double Barrel".
- the downstream part consists of a concentric fixed cylinder into which the overheated virgin aggregates arrive and the recyclates, bitumen and filler filler are introduced.
- the rotating part is provided with arms with paddles, which perform a vigorous mixing.
- the maximum recycling rate is limited by the risk of clogging inside the TSE linked to the presence of recyclates such as AE.
- the document EP 0 146 939 describes a device for manufacturing a new asphalt comprising a device for heating a previously asphalt used asphalt.
- This heating device notably includes infrared radiators.
- the document WO 2018/165768 describes a bituminous mix heater, as well as its implementation method.
- the asphalt heater can be used to repair an existing asphalt pavement or for the construction of new asphalt pavement.
- the heater includes an infrared emitter, a burner tube coupled to the infrared emitter, and a Venturi tube.
- Document CN 101 187 196 describes a device for heating a mix of asphalt in order to recycle them.
- the heating device notably comprises an infrared emitter.
- An object of the present invention is thus to propose a new coating / recycling device which avoids, at least in part, the aforementioned drawbacks.
- the present invention provides a technical solution to the problems identified above.
- the present invention provides a coating device capable of manufacturing bituminous mixes comprising:
- IR infrared emitter
- the Applicant has surprisingly discovered that it is possible to heat one or more types of aggregates, and in particular AEs, by means of at least one infrared emitter and in particular of at least two emitter groups (s ) infrared (s), dimensioned with regard to the characteristics of the aggregate (s) to be heated.
- the aggregate (s) is / are previously heated to a temperature which may be in the region of 250 ° C. in a few seconds (90 s) before being conveyed to the mixer or the drying drum, thereby avoiding any risk of clogging, especially when the aggregate is an AE.
- the coating device comprises several groups of infrared emitter (s), such as at least two groups of infrared emitter (s) which are each capable of emitting a specific wavelength which is dedicated to a precise aggregate.
- the wavelengths emitted are therefore generally different.
- the wavelength of said at least one emitter namely the infrared emitter (s) of the infrared emitter group (s) according to the invention
- the wavelength of said at least one emitter varies from 0.7 micrometer to 1 mm, preferably from 1 to 80 micrometer (s) and typically from 1 to 50 micrometer (s);
- the device comprises at least one envelope, arranged so as to form a tunnel with at least a portion of said at least supply means, preferably all of said supply means and which has an inner face on which is arranged said at less emitter, namely all or part of said groups of infrared emitter (s);
- emitter panels each comprising from 1 to 50 infrared emitter (s), preferably from 2 to 40 infrared emitter (s) and typically from 4 to 24 infrared emitter (s);
- Said at least one emitter (namely the infrared emitter (s) of the infrared emitter group (s) according to the invention) is an infrared carbon emitter;
- the groups of infrared emitter (s) are in the form of panels of infrared emitter (s), preferably each group of infrared emitter (s) is in the form one or more panels of infrared emitter (s).
- the distance “d” between the inner face of said at least envelope where the emitter (s) or infrared emitter (s) (s) are positioned and said upper face of said supply means varies from 10 to 250 mm, preferably from 15 to 200 mm and typically from 20 to 200 mm and in particular from 35 to 100 mm;
- the tunnel extends on a longitudinal axis named X and measures from 8.0 m to 12.5 m (depending on production parameters);
- the tunnel extends on a longitudinal axis X
- the lateral deviation named "y" between two transmitter panels considered in a plane of cross section transverse to the longitudinal axis X, varies from 600 mm to 1200 mm, preferably 600 mm to 800 mm and typically 600 mm (depending on the production parameters);
- the device comprises at least:
- a supply means for each type of aggregates such as a supply means for virgin aggregates (gravel, sand) and a supply means for recycled aggregates (asphalt aggregates); and or
- a supply means for different types of aggregates such as a supply means for both virgin aggregates and recycled aggregates; the means of supply is therefore unique; - all the supply means are suitable for and / or configured to resist electromagnetic radiation emitted by the infrared emitter (s);
- the feed means (s) is / are made of steel
- the device comprises several groups of transmitters or several groups of transmitter panels, each group being capable of emitting a specific wavelength which is different between each group (in particular, the specific wavelength of each group d emitters or each group of emitter panels corresponds substantially to the maximum wavelength in the absorption spectrum of a type of aggregate with which the emitters or emitter panels are associated with a desired temperature);
- the groups of emitters or emitter panels are distributed over different portions of the envelope, such as in the case where the device is provided with a supply means for different types of aggregates, or the groups of transmitters or transmitter panels are distributed over different supply means, such as in the case where the device is provided with a different supply means per type of aggregates.
- the device comprises:
- each group of infrared emitter (s) being distributed over different portions of said envelope, so that the device is provided with the same supply means for different types of aggregates;
- each envelope being specific to a supply means, which is itself dedicated to a type of aggregate and each group of infrared emitter (s) being distributed over a different envelope, so that said device is provided with different supply means for different types of aggregates.
- the present invention also refers to a method of implementing the coating device as described above, comprising the following steps:
- step (b) disposing on said coating device several groups of infrared emitter (s), each group of infrared emitter (s) being capable of or being configured to emit substantially the determined wavelength in step (a) for a given type of aggregate;
- step (c) successively supplying, via said supply means (s), each type of aggregate to the right of said group of infrared emitter (s) which corresponds to it and applying the wavelength, so as to heat by thermal radiation: (d) bringing each type of heated aggregate from step (d) to the mixer and / or the drying drum comprising beforehand at least one hydrocarbon binder and optionally at least one virgin aggregate (fine, sand, gravel), so to make a bituminous mix.
- steps (a) to (c) are thus carried out for different types of aggregates liable to have a different maximum wavelength, such as virgin aggregates (fine, sand, gravel) or even recycled aggregates (aggregates of asphalt).
- the present invention also proposes the use of the device as described above for recycling non-virgin aggregates, or for manufacturing a bituminous mix.
- FIG. 1 is a side view schematically showing a coating device having a longitudinal axis X-X according to an embodiment of the present invention
- FIG. 2 is a cross-sectional view with respect to the longitudinal axis X-X of the coating device of FIG. 1, and
- FIG. 3 is a top view of a cross section of the coating device of FIG. 1 along the axis Y-Y.
- each group of infrared emitter (s) which are capable of emitting a specific wavelength which is different between each group, are arranged on a single supply means.
- a coating device 100 is capable of manufacturing bituminous mixes.
- bituminous mixes we mean an aggregate coated with bitumen, used in road surfaces.
- the coating device 100 is suitable for manufacturing recycling mixes (NF P 98-149 of June 2010).
- a "recycling mix” means a hot mix or cold containing all or part of recycled materials (asphalt aggregates coming either from milling-milling, or from the demolition of existing asphalt mixes), whether the production takes place in a plant or on site.
- the coating device 100 comprises at least: a means 1 for supplying at least one aggregate 5 which is generally a scraper conveyor 1, a mixer and / or a drying drum 3 and a storage enclosure for the aggregate 5.
- this scraper conveyor 1 is connected at one of its ends to the aggregate storage enclosure 5, such as a pre-doser 2 and at its other end to the mixer or a drying drum 3.
- the conveyor squeegee 1 can be connected to one or more aggregate storage enclosures, namely to several pre-setters, each pre-dispenser being specific to a given aggregate (AE, sands, gravel, etc.).
- aggregate is meant a set of grains of dimensions between 0 and 25 mm involved in particular in the composition of a pavement.
- the term aggregate covers various types of material, such as fines, sand, gravel, gravel or even AE.
- the storage enclosure or predoser 2 suitable for the present invention is known to those skilled in the art and will not be described in more detail below. It can be a dosing hopper allowing the storage, and the volumetric or weight dosage of an aggregate.
- mixer and the drying drum 3 are known to those skilled in the art and will not be described in more detail below. These means are used respectively for kneading / drying the various compounds used in the formulation of the bituminous mix. In the case of a TSE, mixing and drying is carried out in the same apparatus.
- the squeegee conveyor 1 according to the invention of axis X-X is arranged horizontally (relative to the ground) as shown in Fig.1.
- the squeegee conveyor 1 can be inclined, the lower part generally being placed on the side of the pre-metering device 2 and the upper part being disposed on the side of the drying drum 3.
- the raclette conveyor 1 has in particular an upper face 4 capable of receiving the aggregate (s) 5.
- the aggregate 5 may initially be preferably an AE and secondly another aggregate, such as only sands and / or gravel.
- the recycling of AE is limited due in particular to clogging problems within the drying drums.
- the device 100 according to the invention overcomes this problem.
- the coating device 100 comprises at the level of the upper face 4 of the squeegee conveyor 1, at least several groups of infrared emitter (s), namely at least two which are capable of emitting a wavelength which corresponds substantially to the maximum wavelength in the absorption spectrum determined by spectrography absorption of said at least aggregate at a desired temperature.
- each group of infrared emitters is capable of emitting a specific wavelength which is different between each group and which is therefore dedicated to a type of aggregate (either for example a first AE, or a second AE different from the first , either sand or gravel, etc.).
- the adsorption spectrum of the aggregate (s) is determined by spectroscopy.
- each granular material emits a wavelength specific to its molecular composition which is directly a function of its temperature, it is possible, using a spectral camera or an infrared camera to have a feedback on the length of wave emitted by the granular material at desired temperature (Planck's law).
- said supply means here the squeegee conveyor 1, is able to and / or configured to resist electromagnetic radiation emitted by the infrared emitter or emitters.
- the squeegee conveyor 1 is made of steel.
- the coating device 100 comprises an envelope 6, arranged so as to form a tunnel with at least a portion of the squeegee conveyor 1, preferably all of the squeegee conveyor 1.
- the casing 6 has an upper face 9 and an inner face 8 on which said groups of infrared emitter (s) are arranged.
- the groups of infrared emitter (s) are in the form of panels of infrared emitter (s), preferably each group of infrared emitter (s) is presented under the shape of one or more panels of infrared emitter (s).
- infrared emitter panels each comprising from 1 to 50 infrared emitters, preferably from 2 to 40 infrared emitters and typically from 4 to 24 infrared emitters is / are arranged (s) on said inner face 8 of the casing 6.
- the casing 6 may also include ventilation openings 7.
- the tunnel extends along the longitudinal axis X and measures 8.0 m to
- a sample of AE aggregates is assembled to the desired temperature (representative sample of approximately plus or minus 5.0 kg).
- desired temperature representsative sample of approximately plus or minus 5.0 kg.
- a spectral camera is used to determine the length emitted by the AE aggregates / recycled materials.
- the maximum wavelength in the absorption spectrum of the AE aggregate sample is thus determined at a desired temperature. This wavelength will then be applied to heat the aggregate.
- the other type (s) of aggregates AE of different origin, sand, gravel, etc.
- the wavelength of said at least one emitter varies from 0.7 micrometer to 1 mm, preferably from 1 to 80 micrometer (s) and typically from 1 to 50 micrometer (s).
- the temperature within the aggregate 5, measured for example with one or more infrared thermometers located at the outlet of the different raclette conveyor (s) 1 varies from 20 to 200 ° O, preferably from 80 to 150 ' O and typically from 1 10 to 150 ° C.
- the aggregate 5 arrives in the mixer or the drying drum 3, it generally has an inlet temperature which is 20 to 50 ° C. lower, preferably 30 to 40 ° C. relative to the temperature inside. of the mixer / drying drum 3.
- the infrared emitters are carbon infrared emitters.
- a carbon infrared emitter suitable for the present invention may correspond to the infrared emitter marketed by Heraeus under the trademark CIR®.
- the device 100 comprises several groups of infrared emitter (s), each group comprising several infrared emitters.
- the IR emitter (s) according to the invention operate on electricity.
- the distance “d” between the inner face of the envelope where the emitter (s) or emitter panel (s) of a group of IR emitter (s) is positioned and the upper face of the raclette conveyor 1 varies from 10 to 250 mm, preferably from 15 mm to 200 mm and typically from 20 mm to 200 mm and in particular from 35 mm to 100 mm.
- a distance "d" ranging from 10 to 250 mm comprises the following values and any interval between these values: 10; 20; 30 ; 40; 50; 60; 70; 80; 90; 100; 1 10; 120; 130; 140; 150; 160; 170; 180; 190; 200; 210; 220; 230; 240 and 250 mm.
- the lateral deviation named "y" between two emitter panels of the same group of IR emitters, considered in a plane of cross section transverse to the longitudinal axis X, can vary from 600 mm to 1200 mm, preferably 600 mm to 800 mm and is typically 600 mm (depending on the production parameters).
- a lateral deviation "y" ranging from 600 to 1200 mm comprises the following values and any interval between these values: 600; 700; 800; 900; 1000; 1,100 and 1,200 mm.
- the longitudinal deviation called "z" between two emitter panels of the same group of IR emitters varies from 0 mm to 100 mm, preferably 50 mm to 100 mm and is typically 100 mm.
- a longitudinal deviation "z" ranging from 0 to 100 mm comprises the following values and any interval between these values: 0 (two adjacent panels are in direct contact); 10; 20; 30 ; 40; 50; 60; 70; 80; 90 and 100 mm.
- the device 100 comprises a raclette conveyor 1 for different types of aggregates, namely the device comprises a single raclette conveyor 1 for the whole granular mixture entering into the formulation of the mix to be formed (a scraper conveyor 1 for virgin aggregates and recycled aggregates).
- the device 100 comprises a single envelope, each group of infrared emitter (s) being distributed over different portions of said envelope, so that the device is provided with the same means of brought for different types of aggregates.
- the envelope 6 can comprise several groups of IR emitters, each group being configured differently so as to heat the different aggregates according to their nature, their moisture content, etc.
- the envelope 6 can comprise several groups of IR emitters, each group being configured differently so as to heat the different aggregates according to their nature, their moisture content, etc.
- FIG. 3 along the raclette conveyor 1, it is possible to provide different possible heating zones, for example ranging from 2 to 6, and in particular 4 different heating zones named in FIG. 3 heating zones A to D.
- FIG. 3 thus shows 4 groups of IR emitters according to the invention.
- the different groups of transmitters of zones A to D can be adjusted on intervals of different wavelengths so as to be able to heat different types of aggregates (fine, sand, gravel, gravel, gravels, etc. or EAs with a different composition from each other).
- the determination of the appropriate wavelength corresponds substantially to the maximum wavelength in the determined absorption spectrum of the aggregate associated with the various groups of emitters from zones A to D and this at a desired temperature.
- the different groups of IR emitters can allow heating of asphalt aggregates of different origin and the non-recycled or virgin aggregates, of the sand and gravel type, can be conveyed to the dryer / mixer mixer by another means. feed or via the raclette conveyor 1 but without being necessary to be heated by a group of IR emitter (s).
- the device 100 can comprise a supply means as described above (namely surmounted by an envelope comprising one or more emitters) for each type of aggregates, such as a squeegee conveyor 1 for virgin aggregates, such as gravel, sand and another squeegee conveyor 1 for recycled aggregates (asphalt aggregates), each of the squeegee conveyors being provided with a group of IR emitters which is specific or which has been dimensioned to heat the aggregate which must be transported in said conveyor.
- a supply means as described above namely surmounted by an envelope comprising one or more emitters
- each type of aggregates such as a squeegee conveyor 1 for virgin aggregates, such as gravel, sand and another squeegee conveyor 1 for recycled aggregates (asphalt aggregates)
- each of the squeegee conveyors being provided with a group of IR emitters which is specific or which has been dimensioned to heat the aggregate which must be transported in said conveyor.
- the device 100 comprises different envelopes, each envelope being specific to a supply means, which is itself dedicated to a type of aggregate and each group of infrared emitter (s) ( s) being distributed over a different envelope, so that said device is provided with different supply means for different types of aggregates.
- the Applicant has estimated that the coating device according to the invention makes it possible to heat 25 to 50 tonnes of EA. In general, for a thickness of 50 mm of AE, the temperatures reached are 101'O in 60 seconds and 243'O in 90 seconds. He was also estimated that the energy demand is around 125,000 kJ metric ton against 250,000 kJ metric ton with the current processes described above.
- the coating device 100 according to the invention therefore has many advantages over the conventional methods used at present.
- the AEs Insofar as the AEs are not heated in the drying drums, but upstream on the raclette conveyor 1, the AEs arrive in the drying drum already at a temperature of 100-120 ° C. and there is therefore no no thermal shock with the virgin aggregates already present in the drying drum, generally at a temperature ranging from 150'O to l yO'O.
- the granular mixture comprising the virgin aggregates (fine, sand, gravel from quarry) and the AE) mixed with new bitumen has a temperature of approximately 120-150 ⁇ .
- the device according to the invention does not induce modifications of the aggregate to be heated, even if it is an AE.
- the device 100 requires a relatively low investment and can be adapted to all current devices, such as those described above in the prior art.
- the present invention also relates to a method of implementing the coating device as described above, comprising the following steps:
- step (a) having on said coating device at least one infrared emitter capable of or configured to emit substantially the wavelength determined in step (a);
- step (d) bring said heated aggregate from step (d) to the mixer and / or the drying drum comprising beforehand at least one hydrocarbon binder and at least one virgin aggregate (fine, sand, gravel), so as to produce a bituminous mix.
- steps (a) to (c) are carried out for different types of aggregates liable to have a different maximum wavelength, such as virgin aggregates (fine, sand, gravel) or even recycled aggregates (aggregates of coated).
- the method according to the invention comprises the following steps: (a) determining, at a desired temperature, the maximum wavelength in the absorption spectrum determined by spectrography of several types of aggregates to be heated which are different, such as recycled aggregate, virgin aggregate such as sand, gravel;
- step (b) disposing on said coating device several groups of infrared emitter (s), each group of infrared emitter (s) being capable of or being configured to emit substantially the determined wavelength in step (a) for a given type of aggregate;
- step (d) bringing each type of heated aggregate from step (d) to the mixer and / or the drying drum comprising beforehand at least one hydrocarbon binder and optionally at least one virgin aggregate (fine, sand, gravel), so to make a bituminous mix
- the present invention also refers to the use of the coating device as described above for recycling non-virgin aggregates or for manufacturing a bituminous mix.
- the ratio “% A / C” corresponds to the ratio between the mass of the granular mixture (AE) and the mass of bitumen contained inside this same granular mixture.
- the sample used has a bitumen mass equal to 3.66% of the total mass of the sample. Grain size of the AEs tested
- the AEs were placed under the transmitters as defined in Table 4 at different distances “d”: 25 mm, 125 mm and 150 mm;
- the mass and temperature of the exposed I ⁇ E were measured every 30 seconds for 3 minutes.
- the temperature of each transmitter was recorded every 30 seconds during the same period of time.
- the AEs were placed under the transmitters as defined in Table 4 at different distances “d”: 25 mm, 125 mm and 150 mm;
- the IR carbon emitter makes it possible to heat recycled aggregates, such as AE, very efficiently.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
- Glanulating (AREA)
- Processing Of Solid Wastes (AREA)
- Coating Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1900165A FR3091543B1 (fr) | 2019-01-08 | 2019-01-08 | Dispositif d’enrobage de granulats, son procédé de mise en œuvre et ses utilisations |
| PCT/FR2020/050022 WO2020144432A1 (fr) | 2019-01-08 | 2020-01-07 | Dispositif d'enrobage de granulats, procédé et utilisations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3908696A1 true EP3908696A1 (fr) | 2021-11-17 |
Family
ID=66641136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20707157.2A Withdrawn EP3908696A1 (fr) | 2019-01-08 | 2020-01-07 | Dispositif d'enrobage de granulats, procédé et utilisations |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20220074147A1 (fr) |
| EP (1) | EP3908696A1 (fr) |
| AU (1) | AU2020206446A1 (fr) |
| CA (1) | CA3125848A1 (fr) |
| CL (1) | CL2021001780A1 (fr) |
| FR (1) | FR3091543B1 (fr) |
| PE (1) | PE20212276A1 (fr) |
| WO (1) | WO2020144432A1 (fr) |
| ZA (1) | ZA202105185B (fr) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3347370C1 (de) * | 1983-12-29 | 1985-05-23 | Deutag-Mischwerke GmbH, 5000 Köln | Vorrichtung zum Erhitzen von zerkleinertem Altasphalt |
| CN101187196A (zh) * | 2007-12-19 | 2008-05-28 | 镇江华晨华通路面机械有限公司 | 隧道式远红外沥青再生加热装置 |
| WO2018165768A1 (fr) * | 2017-03-17 | 2018-09-20 | Smart Fix Asphalt Infrared Repair Ltd. | Appareil et procédé de chauffage infrarouge d'asphalte |
-
2019
- 2019-01-08 FR FR1900165A patent/FR3091543B1/fr not_active Expired - Fee Related
-
2020
- 2020-01-07 WO PCT/FR2020/050022 patent/WO2020144432A1/fr not_active Ceased
- 2020-01-07 US US17/421,180 patent/US20220074147A1/en not_active Abandoned
- 2020-01-07 PE PE2021001135A patent/PE20212276A1/es unknown
- 2020-01-07 CA CA3125848A patent/CA3125848A1/fr active Pending
- 2020-01-07 EP EP20707157.2A patent/EP3908696A1/fr not_active Withdrawn
- 2020-01-07 AU AU2020206446A patent/AU2020206446A1/en not_active Abandoned
-
2021
- 2021-07-05 CL CL2021001780A patent/CL2021001780A1/es unknown
- 2021-07-22 ZA ZA2021/05185A patent/ZA202105185B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| PE20212276A1 (es) | 2021-11-30 |
| US20220074147A1 (en) | 2022-03-10 |
| ZA202105185B (en) | 2022-09-28 |
| CL2021001780A1 (es) | 2022-02-25 |
| FR3091543A1 (fr) | 2020-07-10 |
| FR3091543B1 (fr) | 2021-04-30 |
| CA3125848A1 (fr) | 2020-07-16 |
| WO2020144432A1 (fr) | 2020-07-16 |
| AU2020206446A1 (en) | 2021-07-29 |
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