EP2807305B1 - Device and method for producing coated products, for example bituminous coated products, with protection plates - Google Patents

Device and method for producing coated products, for example bituminous coated products, with protection plates Download PDF

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Publication number
EP2807305B1
EP2807305B1 EP13704198.4A EP13704198A EP2807305B1 EP 2807305 B1 EP2807305 B1 EP 2807305B1 EP 13704198 A EP13704198 A EP 13704198A EP 2807305 B1 EP2807305 B1 EP 2807305B1
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EP
European Patent Office
Prior art keywords
plates
products
internal wall
chamber
coated products
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.)
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Application number
EP13704198.4A
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German (de)
French (fr)
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EP2807305A1 (en
Inventor
Antoine Carrasco
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Argumat SAS
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Argumat SAS
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Publication of EP2807305A1 publication Critical patent/EP2807305A1/en
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1027—Mixing in a rotary receptacle
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1022—Coating the solid ingredients by passing same through a shower or cloud of binder
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1027—Mixing in a rotary receptacle
    • E01C19/1036—Mixing in a rotary receptacle for in-plant recycling or for reprocessing, e.g. adapted to receive and reprocess an addition of salvaged material, adapted to reheat and remix cooled-down batches
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C2019/1081—Details not otherwise provided for
    • E01C2019/109—Mixing containers having a counter flow drum, i.e. the flow of material is opposite to the gas flow
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C2019/1081—Details not otherwise provided for
    • E01C2019/1095—Mixing containers having a parallel flow drum, i.e. the flow of material is parallel to the gas flow

Definitions

  • the present invention relates to the general technical field of devices and processes for manufacturing coated products, for example with bitumen, to obtain bituminous coated products, from a mass of aggregates or solid granular products that it It consists of new and cold aggregates and / or used bituminous products for recycling or a mixture of both, in order to achieve, after drying the evacuation of moisture to obtain a finished coated product used for example in the field of construction and public works.
  • the invention also relates to a process for producing coated products, for example with bitumen, in a rotary kiln provided with an enclosure having a wall internal and a combustion zone and defining a circular direction and a longitudinal direction.
  • the devices for manufacturing coated products are known and use a drying oven which is generally in the form of a cylindrical body of revolution defining an enclosure having at least one inlet to one at its ends and an outlet at the other end, the drying oven being rotated by any suitable means while the aggregate mass of the pebble to be treated is introduced at one end so as to progress towards the outlet end to be treated.
  • the rotation of the enclosure thus makes it possible to circulate the aggregates that enter cold and wet through the inlet, towards the other outlet end while stirring and raising them in the enclosure with the help of all suitable means, and for example lifting blades mounted on the inner peripheries of the walls of the enclosure.
  • the known furnaces also use a heating flux produced by a burner associated with the enclosure, which burner furnishes a flame in a combustion zone of the enclosure, the flame emitting a flow of hot air circulating, depending on the type oven, against the current or in the direction of circulation of the cold and wet aggregates inside the enclosure.
  • the buckets form a series of containers arranged forming a circular band of successive buckets on the inner wall of the furnace in the combustion zone, the buckets having a partial overlap area of the inner wall of the furnace.
  • This provision consequently leaves between the successive buckets a free space as an input for the aggregates entering the combustion zone so that during the rotation of the oven the buckets are continuously filled in the lower part of the oven and then empty when they reach the upper side of the oven the oven thus allowing the cold aggregates to pour down the oven and start their drying while continuing their progress in the furnace to the exit zone.
  • the cold aggregates present in the buckets thus form a cold mass along the inner wall of the enclosure which provides a certain thermal insulation of the wall against the flame of the burner.
  • devices of this type do not solve the existence of clogging phenomena that occur in the combustion zone, clogging from the existence of aggregates loaded with bitumen or other viscous products which tend, in particular because of the thermal heterogeneity present in the different areas of the furnace to be sedimented and cause a general malfunction of the furnace.
  • the objects assigned to the invention therefore aim at proposing a new device and a new process for the manufacture of coated products, for example and in particular bituminous coated products, capable of overcoming the drawbacks mentioned above and of improving the operation of the device. , in particular to reduce the risk of clogging.
  • Another object of the invention is to propose a new device and a new method of manufacturing coated products that can provide excellent thermal protection of the device while improving its overall operation.
  • Another object of the invention is to propose a new device and a new process for manufacturing coated products that make it possible to ensure the treatment of aggregates masses of varying and diversified compositions.
  • Another object of the invention is to propose a new device and a new process for manufacturing coated products which are particularly easy to implement and whose maintenance or maintenance is facilitated.
  • the objects assigned to the invention are also achieved by means of a method for manufacturing coated products, for example with bitumen in a rotary kiln provided with an enclosure having an inner wall as well as a combustion zone and defining a circular direction and a longitudinal direction, said method being characterized in that provides thermal protection of the inner wall by maintaining a continuous air gap and of sufficient thickness in an interface 15 created between the inner wall 2A and a plurality of plates 13 extending at a distance from or against the inner wall 2A, said plates overlapping each other partially in consideration of the circular direction F1 and the longitudinal direction.
  • the figure 1 illustrates a general view of a device for manufacturing coated products, for example with bitumen to manufacture bituminous coated products.
  • the device illustrated in figure 1 is a so-called parallel current device insofar as the heating flow F flows in the same direction as the feed direction and progression of the granular products illustrated by the arrow F.
  • the invention can also be applied to devices for manufacturing coated products, in particular bituminous, said “ against the current " devices in which the heating flow flows in the opposite direction to that of granular products to dry and transform into bituminous coated products ( Fig. 4 ).
  • the device illustrated in a general way to the figure 1 comprises a furnace 1 comprising a substantially cylindrical enclosure 2 intended to be rotated about its longitudinal axis XX 'by a drive means (not shown in the figures) and defining a circular direction and a longitudinal direction, said drive means including, in a manner known per se, a source of energy, of the motor type, a series of conventional gears or drives, consisting for example of rollers engaging drive means secured to the outer wall of the enclosure 2 .
  • the longitudinal direction will correspond to the longitudinal axis X-X 'and the circular direction to the two directions in which the enclosure is rotated.
  • the oven 1 being intended to be rotated, it constitutes a rotary kiln with an enclosure 2 composed of several successive sections each having a specific function.
  • the enclosure 2 has an internal wall 2A and is provided at its two opposite ends with reference to the axis X-X ', on the one hand a main inlet 3 intended to receive aggregates or uncoated virgin granular products or recycled or a mixture of both, pebbles or aggregates, and secondly an outlet for the bituminous coated products manufactured in the enclosure 2, said granular products flowing from the main entrance 2 to the outlet 3 , along the longitudinal direction F to become coated products to the outlet 3, after passage and treatment in the chamber 2.
  • uncoated virgin granular product will be understood to mean any type of product of the aggregates, pebbles, aggregates, sands or other type, having sufficient mechanical strength to be used in the manufacture of coated products. of all kinds likely to be used as building materials in the field of public works, such as roads or walls, without such applications are therefore limiting.
  • recycled granular products any type of products of the kind aggregates, pebbles, aggregates, sands or other having already been used as building materials, for example of road or other, and having already been in this respect provided with a coating based on bitumen, such products are therefore intended to be recycled to recover their coating or coating parts.
  • All these virgin or recycled granular products therefore have a very heterogeneous particle size, a physical and chemical composition that is also very heterogeneous, as well as sizes, shapes, moisture content, consistency, etc. extremely varied.
  • the rotary kiln is designed so that the virgin or recycled granular products circulate from the main feed inlet 2 to the outlet 30 to become a bituminous coated product to the outlet 30, after successive passage: first in a combustion zone 4 into which the main inlet 3 opens via a channel 5, then into a drying zone 6 provided with lifting blades 6A, and finally in a mixing zone 7 in which it is also possible to introduce optionally and continuously, for example, a liquid coating product, for example through a pipe 8 so as to produce a bituminous coated product to the outlet 30.
  • the device for manufacturing coated products according to the invention also comprises a heating means 10 associated with the combustion zone 4 located at the beginning of the enclosure 2.
  • the heating means 10 produces, by the intermediate of a drying flame 11 generated by a burner, a drying flow flowing in a substantially longitudinal direction F and able to ensure the drying of the granular products.
  • the device for manufacturing coated products according to the invention also comprises means of protection 12 of the inner wall 2A of the enclosure 2, which protection means 12 are located in the combustion zone 4 because of the extremely high temperatures resulting from the thermal emission of the flame 11.
  • the protection means 12 are formed by a plurality of plates 13 extending at a distance from or against said inner wall 2A and overlapping each other partially in consideration of the circular direction F1 and the direction longitudinal to provide thermal protection of the inner wall 2A by creating an air gap in the interface 35 created between the inner wall 2A and the plurality of plates 13.
  • the plurality of plates 13 is disposed and extends away from the inner wall 2A to form an annular volume forming the interface 35 and for generating an air gap.
  • the plates 13 being fixed permanently by any conventional means well known to those skilled in the art, and for example by screwing.
  • the interface 35 defines a ring volume of variable thickness increasing or decreasing in the longitudinal direction X-X '.
  • the partial overlap between the plates 13 in the circular direction that is to say in the direction of rotation of the enclosure and in the longitudinal direction, of the order of a few centimeters for example, allows precisely in addition to a thermal protection of the inner wall 2A of the enclosure 2, to prevent the passage of all or part of the granular products 25 in the annular interface zone 35 extending between the inner wall 2A and the faces of the plates 13 vis-à-vis so that it avoids the risk of occurrence of clogging phenomenon.
  • the mounting and the geometric organization of the plates 13 is such that the plates 13 form a continuous protective mat 15 protecting the inner wall 2A in the combustion zone 4 on a complete section of revolution in consideration of the circular direction F1, said belt 15 comprising at least two continuous rows R1, R2 of plates 13 which are partially overlapping in consideration of the longitudinal direction X-X '.
  • the protective mat 15 is formed by a succession of several rows of plates 13 which overlap forming adjacent rows of plates 13 extending in the longitudinal direction so as to overlap partially in the circular direction and overlap partially in the longitudinal direction.
  • the plates 13 are of identical or paired shape, thus facilitating their manufacture and their assembly within the combustion zone 4.
  • each plate 13 comprises a central portion 20 with two opposite sides from which extend two opposite wings 21, 22, on either side of the general plane of extension P of the central portion 20.
  • each wing 21, 22 extends on one side and the other of the plane P, where, which amounts to the same above or below the plane P.
  • the central portion 20 and the two wings 21, 22 are substantially flat or slightly curved in the circular direction to fit the diameter of the cylindrical chamber 2 as shown in the figures.
  • the flat or curved central portion 20 and the two planar or curved wings 21, 22 have a quadrilateral shape.
  • the flat central part 20 has a general shape of rectangle or square or diamond, of average dimensions, in the circular and longitudinal direction respectively, of between 150 and 600 mm, more precisely between 150 and 400 mm
  • the planar or curved wings 21, 22 have a general shape of rectangle of average dimensions respectively in the circular direction of between 10 and 50 mm.
  • the plates 13 may vary in their shape and their geometrical dimensions and for example present a certain curvature, or even possess various geometric shapes and other than a quadrilateral, the essential being that they can being connected to each other so as to overlap each other and partially in the longitudinal direction and in the circular direction in order to effectively protect the inner wall 2A and to oppose the passage of the granular products 5 into the interface 35.
  • the plates 13 are positioned in each row so that, in consideration of the circular direction F1, each plate 13 is connected to a so-called upper plate 13S ( figure 7 ) and a plate 13 said lower 131 adjacent, the two wings 21, 22 of each plate 13 being disposed one above the other thus forming a so-called upper wing 21 S and a so-called lower wing 21I so that the upper wing 21S of a plate 13 covers the lower flange 211 of the neighboring upper plate and the lower flange 211 is covered by the upper flange of the lower plate and so on.
  • each plate 13 By virtue of this arrangement and the configuration of each plate 13, it is thus possible to form a zone of overlap between two adjacent plates which is formed by an upper wing 21 which covers a lower wing 22 thus making it possible to avoid the passage of the products. in the interface 35 during the rotation of the furnace 1.
  • the overlap between the lower flanges 22 and the upper flanges 21 illustrated in FIG. Figure 8 it is preferably not waterproof and there exists for example by construction and mounting a longitudinal gap 200 of small thickness for the creation of an air passage or fluid.
  • the plane of extension of the wings 21, 22 forms an angle ⁇ ( figure 8 ) which is of the order of 45 degrees relative to the extension plane P of the central portion 20, which angle is obviously caused to vary according to the diameter of the chamber 2.
  • the plurality of plates 13 form a convergent cone ( figure 4 ) or diverge ( figure 2 ) in consideration of the flow direction F granular products within the chamber 2.
  • the variant of figure 4 does not differ from that of the figure 2 only by the frustoconical convergent shape of the combustion zone 4 used in countercurrent devices instead of a frustoconical divergent shape used in parallel flow devices of the figure 2 .
  • the plates 13 are mounted with an inclination and form an angle ⁇ ( figure 2 or 4 ) corresponding to the angle formed between the horizontal plane PH and the general extension plane P of the central portion 20 of each plate.
  • the angle ⁇ is advantageously between 0 and about 5 degrees, the latter value forming the maximum practically feasible, it being understood that the shape of the plates is adapted to the divergent or convergent geometric configuration of the formed cone.
  • the device according to the invention may comprise a system 40 for recycling the fumes produced during the manufacture of the products embedded in the enclosure 2, said system recycling the fumes in the interface 35.
  • the recycling system 40 is connected to the output of the enclosure 2 and comprises a bag filter 43, an extraction means 45 and a recycling line 46 opening into the interface 15.
  • the figure 1 illustrates a variant of the invention in which the recycling is carried out after passage of the fumes in the filter 43, the recycling line is therefore located downstream of the bag filter 43.
  • driving recycling station is located or mounted upstream of the bag filter 43.
  • the recycling system 40 comprises an outlet pipe 47 controlled by a flap to direct the smoke to the outside if necessary without recycling or with partial recycling.
  • the recycling line 46 can lead into the interface 35 by one or more openings 48 integral with a closure panel 49 of the enclosure 2 ( Fig. 1 and 2 ).
  • the recycling system is ensured a better burning fumes which helps reduce their toxicity while injecting cooled gases in the interface 35 of the combustion zone 4 which helps maintain a blade of insulating air at low temperatures at this level.
  • the enclosure 2. This promotes the maintenance of good thermal insulation, avoids clogging and allows to feed the combustion zone with a mass of heavily loaded aggregates or even fully loaded with recycled materials without fear of clogging.
  • the invention also relates to a process for producing coated products, for example with bitumen in a rotary kiln provided with an enclosure having an inner wall and a combustion zone and defining a circular direction and a longitudinal direction, said method being such as provides thermal protection of the inner wall by maintaining a continuous air gap and sufficient thickness in an interface (35) created between the inner wall (2A) and a plurality of plates (13) s' extending at a distance from or against the inner wall (2A), said plates overlapping each other partially in consideration of the circular direction (F1) and the longitudinal direction X-X '.
  • the process is such that the air knife is maintained by recycling all or part of the fumes resulting from the manufacture of the coated products directly in the interface 35.
  • the frustoconical shape of the plate network 13 promotes the renewal of the air gap that can leak out between the inter-plate spaces 29 ( Fig. 3 and 7 ) above.
  • the rotation of the chamber 2 and in particular the truncated cone formed by the plurality of plates 13 in partial overlap makes it possible to ensure a gradual advance of the granular products 25 and a slight circular displacement of the products in the low zone by the wings 21, 22 positioned in mutual overlap which form a series of steps or successive steps.
  • the granular products 25, while progressing continuously along the arrow F in the chamber 2 in the longitudinal direction, are constantly stirred at the bottom of the combustion zone 4 while progressing continuously within the rotary kiln to reach the zone of combustion. drying 6 and finally the mixing zone 7.
  • the recycling of the fumes sucked by the extraction means 45, of the fan type continually renews the air gap, thus reinforcing its insulation efficiency.
  • the granular products are of course gradually dried and then coated in the kneading zone 7 by contact with bitumen and / or other coating ingredients.
  • the manufacturing device according to the invention can, without risk of clogging, ensure the manufacture of bituminous products from 0% of new and cold granular materials and 100% of used bituminous materials and therefore recycled or recycled. a mixture in any proportion of the two.
  • the device according to the invention also makes it possible to strongly limit the wear zones of the enclosure 2 in general and to facilitate the maintenance of the entire device. It is indeed possible to change only one or more plates 13 in case of wear, without having to change all the parts constituting the combustion zone 4.
  • the network of plates 13 due to the mutual overlap of the neighboring plates 13 in two directions of space, provides good thermal insulation of the inner wall 2A of the furnace by creating a continuous air gap over the entire internal surface of the enclosure in the interface 35.
  • This device finally makes it possible to eliminate the additional devices for introducing used bituminous products that are to be recycled and which are generally situated downstream of the flame 11 in the devices of the prior art. Indeed, the absence of the appearance of the classic clogging phenomenon in the combustion zone 4 by virtue of the device of the invention makes it possible to supply the combustion zone 4 directly with granular products recycled in a very large proportion or even totally.
  • the invention finds its industrial application in the design and use of devices and processes for manufacturing coated products, for example bituminous coated products.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Moulding By Coating Moulds (AREA)

Description

DOMAINE TECHNIQUETECHNICAL AREA

La présente invention se rapporte au domaine technique général des dispositifs et procédés de fabrication de produits enrobés, par exemple avec du bitume, pour obtenir des produits enrobés bitumineux, à partir d'une masse d'agrégats ou de produits granuleux solides qu'il s'agisse de granulats neufs et froids et/ou de produits bitumineux usagés à recycler ou encore d'un mélange des deux, en vue de réaliser, après séchage l'évacuation de l'humidité pour obtenir un produit enrobé fini utilisable par exemple dans le domaine de la construction et des travaux publics.The present invention relates to the general technical field of devices and processes for manufacturing coated products, for example with bitumen, to obtain bituminous coated products, from a mass of aggregates or solid granular products that it It consists of new and cold aggregates and / or used bituminous products for recycling or a mixture of both, in order to achieve, after drying the evacuation of moisture to obtain a finished coated product used for example in the field of construction and public works.

La présente invention concerne plus particulièrement un dispositif de fabrication de produits enrobés, par exemple avec du bitume, comprenant :

  • un four comprenant une enceinte sensiblement cylindrique destinée à être mise en rotation autour de son axe longitudinal par un moyen d'entraînement, ladite enceinte ayant une paroi interne et étant pourvue vers ses deux extrémités opposées, d'une part d'une entrée principale destinée à recevoir des produits granuleux vierges non enrobés ou recyclés ou un mélange des deux, du genre cailloux ou granulats, et d'autre part d'une sortie pour les produits enrobés bitumineux fabriqués dans l'enceinte, lesdits produits granuleux circulant de l'entrée principale vers la sortie pour se transformer en produits enrobés à la sortie, après passage et traitement dans l'enceinte,
  • un moyen de chauffe définissant une zone de combustion dans l'enceinte et générant un flux de séchage apte à assurer le séchage des produits granuleux,
  • des moyens de protection de la paroi interne de l'enceinte qui sont situés dans la zone de combustion.
The present invention more particularly relates to a device for manufacturing coated products, for example with bitumen, comprising:
  • an oven comprising a substantially cylindrical enclosure intended to be rotated about its longitudinal axis by a drive means, said enclosure having an inner wall and being provided towards its two opposite ends, firstly with a main inlet intended to receiving uncoated or recycled virgin granular products or a mixture of the two, such as pebbles or aggregates, and secondly an outlet for bituminous coated products made in the enclosure, said granular products circulating from the entrance main exit to turn into coated products at the exit, after passage and treatment in the enclosure,
  • a heating means defining a combustion zone in the chamber and generating a drying flow capable of ensuring the drying of the granular products,
  • means for protecting the inner wall of the enclosure which are located in the combustion zone.

L'invention concerne également un procédé de fabrication de produits enrobés, par exemple avec du bitume, dans un four rotatif pourvu d'une enceinte ayant une paroi interne ainsi qu'une zone de combustion et définissant un sens circulaire et un sens longitudinal.The invention also relates to a process for producing coated products, for example with bitumen, in a rotary kiln provided with an enclosure having a wall internal and a combustion zone and defining a circular direction and a longitudinal direction.

TECHNIQUE ANTERIEUREPRIOR ART

Les dispositifs de fabrication de produits enrobés, en particulier de produits enrobés bitumineux, sont connus et mettent en oeuvre un four de séchage se présentant généralement sous la forme d'un corps de révolution cylindrique définissant une enceinte présentant au moins une entrée à l'une de ses extrémités et une sortie à l'autre extrémité, le four de séchage étant entraîné en rotation par tout moyen approprié pendant que la masse d'agrégats du caillou à traiter est introduite par une extrémité de manière à progresser vers l'extrémité de sortie pour être traitée.The devices for manufacturing coated products, in particular bituminous coated products, are known and use a drying oven which is generally in the form of a cylindrical body of revolution defining an enclosure having at least one inlet to one at its ends and an outlet at the other end, the drying oven being rotated by any suitable means while the aggregate mass of the pebble to be treated is introduced at one end so as to progress towards the outlet end to be treated.

Des tels dispositifs sont connus par US2006/0265898 A1 , US 5 203 693 A et EP 2 281 946 A1 .Such devices are known by US2006 / 0265898 A1 , US 5,203,693 A and EP 2 281 946 A1 .

La rotation de l'enceinte permet ainsi de faire circuler les agrégats qui entrent froids et humides par l'entrée, en direction de l'autre extrémité de sortie tout en les remuant et en les relevant dans l'enceinte à l'aide de tous moyens appropriés, et par exemple des aubes de relevage montées sur les périphéries internes des parois de l'enceinte.The rotation of the enclosure thus makes it possible to circulate the aggregates that enter cold and wet through the inlet, towards the other outlet end while stirring and raising them in the enclosure with the help of all suitable means, and for example lifting blades mounted on the inner peripheries of the walls of the enclosure.

Les fours connus mettent également en oeuvre un flux chauffant produit par un brûleur associé à l'enceinte, lequel brûleur fournit une flamme dans une zone de combustion de l'enceinte, la flamme émettant un flux d'air chaud qui circule, selon le type de four, à contre courrant ou dans les sens de circulation des agrégats froids et humides à l'intérieur de l'enceinte.The known furnaces also use a heating flux produced by a burner associated with the enclosure, which burner furnishes a flame in a combustion zone of the enclosure, the flame emitting a flow of hot air circulating, depending on the type oven, against the current or in the direction of circulation of the cold and wet aggregates inside the enclosure.

On connaît enfin des fours de fabrication de produits enrobés bitumineux fonctionnant en mode continu ou discontinu, qui comportent des augets de récupération de chaleur qui sont installés dans la zone de combustion pour protéger la paroi interne du four des dégradations pouvant survenir en raison de la chaleur produite par le brûleur et de l'usure provenant du passage des granulats.Finally, there are known manufacturing kilns for bituminous coated products operating in continuous or discontinuous mode, which comprise heat recovery buckets which are installed in the combustion zone to protect the inner wall of the furnace from damage that may occur due to heat. produced by the burner and wear from the passage of aggregates.

Dans ces dispositifs connus, les augets forment une série de récipients disposés en formant une bande circulaire d'augets successifs sur la paroi interne du four dans la zone de combustion, les augets ayant une zone de recouvrement partielle de la paroi interne du four. Cette disposition laisse par conséquent entre les augets successifs un interstice libre faisant office d'entrée pour les granulats qui entrent dans la zone de combustion de telle sorte que lors de la rotation du four les augets viennent continuellement se remplir dans la partie basse du four puis se vider lorsqu'ils atteignent la partie haute latérale du four permettant ainsi aux granulats froids de se déverser vers le bas du four et de débuter leur assèchement tout en poursuivant leur progression au sein du four vers la zone de sortie.In these known devices, the buckets form a series of containers arranged forming a circular band of successive buckets on the inner wall of the furnace in the combustion zone, the buckets having a partial overlap area of the inner wall of the furnace. This provision consequently leaves between the successive buckets a free space as an input for the aggregates entering the combustion zone so that during the rotation of the oven the buckets are continuously filled in the lower part of the oven and then empty when they reach the upper side of the oven the oven thus allowing the cold aggregates to pour down the oven and start their drying while continuing their progress in the furnace to the exit zone.

Les granulats froids présents dans les augets forment ainsi une masse froide le long de la paroi interne de l'enceinte ce qui procure une certaine isolation thermique de la paroi à l'encontre de la flamme du brûleur.The cold aggregates present in the buckets thus form a cold mass along the inner wall of the enclosure which provides a certain thermal insulation of the wall against the flame of the burner.

Par ailleurs, il s'avère qu'en raison des grandes disparités de composition des granulats froids qui peuvent être des granulats neufs ou des granulats usagés voire par exemple un mélange des deux dans des proportions extrêmement variables, l'avancement de la masse de granulats n'est pas homogène et est parfois même difficile de telle sorte qu'il est souvent justifié de prévoir des dispositifs supplémentaires pour favoriser l'avancement de la masse de granulats tel que des hélices par exemple. Ceci complique le fonctionnement de tels fours tout en en renchérissant le coût et l'entretien.Moreover, it turns out that due to the large differences in the composition of cold aggregates which may be new aggregates or used aggregates or even for example a mixture of the two in extremely variable proportions, the advancement of the mass of aggregates is not homogeneous and is sometimes difficult so that it is often justified to provide additional devices to promote the advancement of the mass of aggregates such as propellers for example. This complicates the operation of such ovens while increasing the cost and maintenance.

Enfin, il s'avère que les dispositifs de ce type ne permettent pas de résoudre l'existence de phénomènes de colmatage qui surviennent dans la zone de combustion, les colmatages provenant de l'existence de granulats chargés en bitume ou de tout autre produits visqueux, lesquels ont tendance, en particulier en raison de l'hétérogénéité thermique présente dans les différentes zones du four à sédimenter et provoquer un disfonctionnement général du four.Finally, it turns out that devices of this type do not solve the existence of clogging phenomena that occur in the combustion zone, clogging from the existence of aggregates loaded with bitumen or other viscous products which tend, in particular because of the thermal heterogeneity present in the different areas of the furnace to be sedimented and cause a general malfunction of the furnace.

EXPOSE DE L'INVENTIONSUMMARY OF THE INVENTION

Les objets assignés à l'invention visent par conséquent à proposer un nouveau dispositif et un nouveau procédé de fabrication de produits enrobés, par exemple et en particulier de produits enrobés bitumineux, susceptibles de porter remède aux inconvénients mentionnés précédemment et à améliorer le fonctionnement du dispositif, en particulier à réduire le risque de colmatage.The objects assigned to the invention therefore aim at proposing a new device and a new process for the manufacture of coated products, for example and in particular bituminous coated products, capable of overcoming the drawbacks mentioned above and of improving the operation of the device. , in particular to reduce the risk of clogging.

Un autre objet de l'invention vise à proposer un nouveau dispositif et un nouveau procédé de fabrication de produits enrobés susceptibles d'assurer une excellente protection thermique du dispositif tout en améliorant son fonctionnement général.Another object of the invention is to propose a new device and a new method of manufacturing coated products that can provide excellent thermal protection of the device while improving its overall operation.

Un autre objet de l'invention vise à proposer un nouveau dispositif et un nouveau procédé de fabrication de produits enrobés qui permettent d'assurer le traitement de masses de granulats de compositions variables et diversifiées.Another object of the invention is to propose a new device and a new process for manufacturing coated products that make it possible to ensure the treatment of aggregates masses of varying and diversified compositions.

Un autre objet de l'invention vise à proposer un nouveau dispositif et un nouveau procédé de fabrication de produits enrobés qui soient particulièrement faciles à mettre en oeuvre et dont l'entretien ou la maintenance est facilité.Another object of the invention is to propose a new device and a new process for manufacturing coated products which are particularly easy to implement and whose maintenance or maintenance is facilitated.

Les objets assignés à l'invention sont atteints à l'aide d'un dispositif de fabrication de produits enrobés, par exemple avec du bitume, comprenant :

  • un four comprenant une enceinte sensiblement cylindrique destinée à être mise en rotation autour de son axe longitudinal par un moyen d'entraînement, ladite enceinte ayant une paroi interne et étant pourvue vers ses deux extrémités opposées, d'une part d'une entrée principale destinée à recevoir des produits granuleux vierges non enrobés ou recyclés ou un mélange des deux, du genre cailloux ou granulats, et d'autre part d'une sortie pour les produits enrobés bitumineux fabriqués dans l'enceinte, lesdits produits granuleux circulant de l'entrée principale vers la sortie pour se transformer en produits enrobés à la sortie, après passage et traitement dans l'enceinte,
  • un moyen de chauffe définissant une zone de combustion dans l'enceinte et générant un flux de séchage apte à assurer le séchage des produits granuleux,
  • des moyens de protection de la paroi interne de l'enceinte qui sont situés dans la zone de combustion,
caractérisé en ce que les moyens de protection sont formés par une pluralité de plaques s'étendant à distance de ou contre ladite paroi interne et se recouvrant mutuellement de manière partielle en considération du sens circulaire pour assurer à la fois la protection thermique de la paroi interne et le relevage du matériau lors de la rotation de l'enceinte.The objects assigned to the invention are achieved by means of a device for manufacturing coated products, for example with bitumen, comprising:
  • an oven comprising a substantially cylindrical enclosure intended to be rotated about its longitudinal axis by a drive means, said enclosure having an inner wall and being provided towards its two opposite ends, firstly with a main inlet intended to receiving uncoated or recycled virgin granular products or a mixture of the two, such as pebbles or aggregates, and secondly an outlet for bituminous coated products made in the enclosure, said granular products circulating from the entrance main exit to turn into coated products at the exit, after passage and treatment in the enclosure,
  • a heating means defining a combustion zone in the chamber and generating a drying flow capable of ensuring the drying of the granular products,
  • means for protecting the inner wall of the enclosure which are located in the combustion zone,
characterized in that the protection means are formed by a plurality of plates extending at a distance from or against said inner wall and partially overlapping one another in consideration of the circular direction to provide both the thermal protection of the inner wall and lifting the material during rotation of the enclosure.

Les objets assignés à l'invention sont également atteints à l'aide d'un procédé de fabrication de produits enrobés, par exemple avec du bitume dans un four rotatif pourvu d'une enceinte ayant une paroi interne ainsi qu'une zone de combustion et définissant un sens circulaire et un sens longitudinal, ledit procédé étant caractérisé en ce qu'on assure la protection thermique de la paroi interne en entretenant une lame d'air continue et d'épaisseur suffisante dans une interface 15 créée entre la paroi interne 2A et une pluralité de plaques 13 s'étendant à distance de ou contre la paroi interne 2A, lesdites plaques se recouvrant mutuellement de manière partielle en considération du sens circulaire F1 et du sens longitudinal.The objects assigned to the invention are also achieved by means of a method for manufacturing coated products, for example with bitumen in a rotary kiln provided with an enclosure having an inner wall as well as a combustion zone and defining a circular direction and a longitudinal direction, said method being characterized in that provides thermal protection of the inner wall by maintaining a continuous air gap and of sufficient thickness in an interface 15 created between the inner wall 2A and a plurality of plates 13 extending at a distance from or against the inner wall 2A, said plates overlapping each other partially in consideration of the circular direction F1 and the longitudinal direction.

DESCRIPTIF SOMMAIRE DES DESSINSSUMMARY DESCRIPTION OF THE DRAWINGS

D'autres particularités et avantages de l'invention apparaîtront et ressortiront plus en détails à la lecture de la description faite ci-après, en référence aux dessins annexés, donnés uniquement à titre d'exemple illustratif et non limitatif, dans lesquels :

  • La figure 1 représente, selon une vue en coupe transversale longitudinale, une vue générale complète d'un dispositif de fabrication de produits enrobés conforme à l'invention.
  • La figure 2 représente, selon une vue transversale longitudinale partielle, une première variante d'un dispositif de fabrication de produits enrobés conforme à l'invention.
  • La figure 3 représente, selon une vue en coupe transversale, effectué selon la ligne III-III de la figure 2 une vue en coupe de la première variante de réalisation d'un dispositif de fabrication de produits enrobés conforme à l'invention.
  • La figure 4 représente, selon une vue en coupe transversale longitudinale partielle, une seconde variante de réalisation d'un dispositif de fabrication de produits enrobés conforme à l'invention.
  • La figure 5 représente, selon une vue en coupe transversale, effectuée selon la ligne V-V de la figure 4, un dispositif de fabrication de produits enrobés conforme à l'invention et correspondant à la seconde variante de réalisation.
  • Les figures 6 à 7 illustrent selon des vues en perspective partielle, des détails de réalisation du dispositif de fabrication de produits enrobés conforme à l'invention.
  • La figure 8 illustre de manière schématique le montage en recouvrement partiel des plaques selon l'invention et selon une coupe transversale.
Other features and advantages of the invention will appear and will appear in more detail on reading the description given below, with reference to the accompanying drawings, given solely by way of illustrative and non-limiting example, in which:
  • The figure 1 represents, in a longitudinal cross-sectional view, a complete general view of a device for manufacturing coated products according to the invention.
  • The figure 2 represents, in a partial longitudinal transverse view, a first variant of a device for manufacturing coated products according to the invention.
  • The figure 3 represents, in a cross-sectional view, taken along line III-III of the figure 2 a sectional view of the first embodiment of a device for manufacturing coated products according to the invention.
  • The figure 4 represents, in a partial longitudinal cross-sectional view, a second variant embodiment of a device for manufacturing coated products according to the invention.
  • The figure 5 represents, in a cross-sectional view, taken along the line VV of the figure 4 , a device for manufacturing coated products according to the invention and corresponding to the second embodiment variant.
  • The Figures 6 to 7 illustrate in partial perspective views, details of embodiment of the device for manufacturing coated products according to the invention.
  • The figure 8 schematically illustrates the partial overlap mounting of the plates according to the invention and in a cross section.

MEILLEURE MANIERE DE REALISER L'INVENTIONBEST MODE OF REALIZING THE INVENTION

La figure 1 illustre une vue générale d'un dispositif de fabrication de produits enrobés, par exemple avec du bitume pour fabriquer des produits enrobés bitumineux.The figure 1 illustrates a general view of a device for manufacturing coated products, for example with bitumen to manufacture bituminous coated products.

Le dispositif illustré à la figure 1 est un dispositif dit à courant parallèle dans la mesure où le flux chauffant F circule dans la même direction que la direction d'alimentation et de progression des produits granuleux illustrée par la flèche F.The device illustrated in figure 1 is a so-called parallel current device insofar as the heating flow F flows in the same direction as the feed direction and progression of the granular products illustrated by the arrow F.

Il doit néanmoins être noté que l'invention pourra également s'appliquer à des dispositifs de fabrication de produits enrobés, notamment bitumineux, dit « à contre-courant », dispositifs dans lesquels le flux chauffant circule dans le sens inverse de celui des produits granuleux à sécher et à transformer en produits enrobés bitumineux (Fig. 4).It should nevertheless be noted that the invention can also be applied to devices for manufacturing coated products, in particular bituminous, said " against the current " devices in which the heating flow flows in the opposite direction to that of granular products to dry and transform into bituminous coated products ( Fig. 4 ).

Le dispositif illustré de manière générale à la figure 1 comprend un four 1 comprenant une enceinte 2 sensiblement cylindrique destinée à être mise en rotation autour de son axe longitudinal X-X' par un moyen d'entraînement (non représenté aux figures) et définissant un sens circulaire et un sens longitudinal, lesdits moyens d'entrainement incluant de manière connue en soit, une source d'énergie, du genre moteur, une série d'engrenages ou entraînements conventionnels, constitués par exemple de galets venant en prise sur des moyens d'entraînements solidaires de la paroi externe de l'enceinte 2.The device illustrated in a general way to the figure 1 comprises a furnace 1 comprising a substantially cylindrical enclosure 2 intended to be rotated about its longitudinal axis XX 'by a drive means (not shown in the figures) and defining a circular direction and a longitudinal direction, said drive means including, in a manner known per se, a source of energy, of the motor type, a series of conventional gears or drives, consisting for example of rollers engaging drive means secured to the outer wall of the enclosure 2 .

Ainsi, au sens de l'invention, le sens longitudinal correspondra à l'axe longitudinal X-X' et le sens circulaire aux deux directions dans lesquelles l'enceinte est mise en rotation.Thus, in the sense of the invention, the longitudinal direction will correspond to the longitudinal axis X-X 'and the circular direction to the two directions in which the enclosure is rotated.

Le four 1 étant destiné à être mis en rotation, il constitue un four rotatif avec une enceinte 2 composée de plusieurs sections successives ayant chacune une fonction spécifique. L'enceinte 2 a une paroi interne 2A et est pourvue vers ses deux extrémités opposées en prenant comme référence l'axe X-X', d'une part d'une entrée principale 3 destinée à recevoir des agrégats ou produits granuleux vierges non enrobés ou recyclés ou un mélange des deux, du genre cailloux ou granulats, et d'autre part d'une sortie 30 pour les produits enrobés bitumineux fabriqués dans l'enceinte 2, lesdits produits granuleux circulant de l'entrée principale 2 vers la sortie 3, selon la sens longitudinal F pour se transformer en produits enrobés vers la sortie 3, après passage et traitement dans l'enceinte 2.The oven 1 being intended to be rotated, it constitutes a rotary kiln with an enclosure 2 composed of several successive sections each having a specific function. The enclosure 2 has an internal wall 2A and is provided at its two opposite ends with reference to the axis X-X ', on the one hand a main inlet 3 intended to receive aggregates or uncoated virgin granular products or recycled or a mixture of both, pebbles or aggregates, and secondly an outlet for the bituminous coated products manufactured in the enclosure 2, said granular products flowing from the main entrance 2 to the outlet 3 , along the longitudinal direction F to become coated products to the outlet 3, after passage and treatment in the chamber 2.

Au sens de l'invention, on entendra par l'expression « produit granuleux vierges non enrobés » tout type de produits du genre agrégats, cailloux, granulats, sables ou autres, présentant une résistance mécanique suffisante pour être utilisés dans la fabrication de produits enrobés de toutes sortes susceptibles d'être utilisés comme matériaux de construction dans le domaine des travaux publics, tels que les routes ou murs, sans que de telles applications soient pour autant limitatives.For the purposes of the invention, the expression " uncoated virgin granular product " will be understood to mean any type of product of the aggregates, pebbles, aggregates, sands or other type, having sufficient mechanical strength to be used in the manufacture of coated products. of all kinds likely to be used as building materials in the field of public works, such as roads or walls, without such applications are therefore limiting.

De la même manière au sens de l'invention on entendra par l'expression « produits granuleux recyclés » tout type de produits du genre agrégats, cailloux, granulats, sables ou autres ayant déjà été utilisés en tant que matériaux de construction, par exemple de route ou autres, et ayant déjà été à ce titre pourvus d'un enrobage à base de bitume, de tels produits étant donc destinés à être recyclés pour récupérer leur enrobage ou fractions d'enrobage.Similarly in the sense of the invention will be understood by the term " recycled granular products " any type of products of the kind aggregates, pebbles, aggregates, sands or other having already been used as building materials, for example of road or other, and having already been in this respect provided with a coating based on bitumen, such products are therefore intended to be recycled to recover their coating or coating parts.

L'ensemble de ces produits granuleux vierges ou recyclés présente donc une granulométrie très hétérogène, une composition physique et chimique également très hétérogène ainsi que des tailles, des formes, une teneur en humidité, une consistance etc. extrêmement variés.All these virgin or recycled granular products therefore have a very heterogeneous particle size, a physical and chemical composition that is also very heterogeneous, as well as sizes, shapes, moisture content, consistency, etc. extremely varied.

D'une manière générale, le four rotatif est conçu pour que les produits granuleux vierges ou recyclés circulent de l'entrée principale d'alimentation 2 vers la sortie 30 pour se transformer en produit enrobé bitumineux vers la sortie 30, après passage successif : d'abord dans une zone de combustion 4 dans laquelle débouche l'entrée principale 3 par un canal 5, ensuite dans une zone de séchage 6 pourvue d'aubes de relevage 6A, enfin dans une zone de malaxage 7 dans laquelle on peut également introduire de manière optionnelle et en continu par exemple, un produit d'enrobage liquide, par exemple par le biais d'une tubulure 8 de manière à produire un produit enrobé bitumineux vers la sortie 30.In general, the rotary kiln is designed so that the virgin or recycled granular products circulate from the main feed inlet 2 to the outlet 30 to become a bituminous coated product to the outlet 30, after successive passage: first in a combustion zone 4 into which the main inlet 3 opens via a channel 5, then into a drying zone 6 provided with lifting blades 6A, and finally in a mixing zone 7 in which it is also possible to introduce optionally and continuously, for example, a liquid coating product, for example through a pipe 8 so as to produce a bituminous coated product to the outlet 30.

Tel qu'illustré, le dispositif de fabrication de produits enrobés conforme à l'invention comporte également un moyen de chauffe 10 associé à la zone de combustion 4 située au début de l'enceinte 2. Le moyen de chauffe 10 produit, par l'intermédiaire d'une flamme de séchage 11 générée par un brûleur, un flux de séchage circulant selon un sens sensiblement longitudinal F et apte à assurer le séchage des produits granuleux.As illustrated, the device for manufacturing coated products according to the invention also comprises a heating means 10 associated with the combustion zone 4 located at the beginning of the enclosure 2. The heating means 10 produces, by the intermediate of a drying flame 11 generated by a burner, a drying flow flowing in a substantially longitudinal direction F and able to ensure the drying of the granular products.

Tel qu'illustré aux figures, le dispositif de fabrication de produits enrobés conforme à l'invention comporte également des moyens de protection 12 de la paroi interne 2A de l'enceinte 2, lesquels moyens de protection 12 sont situés dans la zone de combustion 4 en raison des températures extrêmement élevées provenant de l'émission thermique de la flamme 11.As illustrated in the figures, the device for manufacturing coated products according to the invention also comprises means of protection 12 of the inner wall 2A of the enclosure 2, which protection means 12 are located in the combustion zone 4 because of the extremely high temperatures resulting from the thermal emission of the flame 11.

Selon une caractéristique importante de l'invention, les moyens de protection 12 sont formés par une pluralité de plaques 13 s'étendant à distance de ou contre ladite paroi interne 2A et se recouvrant mutuellement de manière partielle en considération du sens circulaire F1 et du sens longitudinal pour assurer la protection thermique de la paroi interne 2A par création d'une lame d'air dans l'interface 35 créée entre la paroi interne 2A et la pluralité de plaques 13.According to an important characteristic of the invention, the protection means 12 are formed by a plurality of plates 13 extending at a distance from or against said inner wall 2A and overlapping each other partially in consideration of the circular direction F1 and the direction longitudinal to provide thermal protection of the inner wall 2A by creating an air gap in the interface 35 created between the inner wall 2A and the plurality of plates 13.

Dans les exemples illustrés aux figures 1 à 7, la pluralité de plaques 13 est disposée et s'étend à distance de la paroi interne 2A pour former un volume annulaire formant l'interface 35 et permettant de générer une lame d'air. Les plaques 13 étant fixées à demeure par tous moyens classiques bien connus de l'homme du métier, et par exemple par vissage. Tel qu'illustré, l'interface 35 définit un volume annulaire d'épaisseur variable croissante ou décroissante selon la direction longitudinale X-X'.In the examples illustrated in Figures 1 to 7 , the plurality of plates 13 is disposed and extends away from the inner wall 2A to form an annular volume forming the interface 35 and for generating an air gap. The plates 13 being fixed permanently by any conventional means well known to those skilled in the art, and for example by screwing. As illustrated, the interface 35 defines a ring volume of variable thickness increasing or decreasing in the longitudinal direction X-X '.

Selon l'invention, le recouvrement partiel entre les plaques 13 dans le sens circulaire c'est-à-dire dans le sens de rotation de l'enceinte et dans le sens longitudinal, de l'ordre de quelques centimètres par exemple, permet précisément outre une protection thermique de la paroi interne 2A de l'enceinte 2, d'empêcher le passage de tout ou partie des produits granuleux 25 dans la zone d'interface annulaire 35 s'étendant entre la paroi interne 2A et les faces des plaques 13 en vis-à-vis de telle sorte que l'on évite les risques d'apparition du phénomène de colmatage.According to the invention, the partial overlap between the plates 13 in the circular direction, that is to say in the direction of rotation of the enclosure and in the longitudinal direction, of the order of a few centimeters for example, allows precisely in addition to a thermal protection of the inner wall 2A of the enclosure 2, to prevent the passage of all or part of the granular products 25 in the annular interface zone 35 extending between the inner wall 2A and the faces of the plates 13 vis-à-vis so that it avoids the risk of occurrence of clogging phenomenon.

Selon des caractéristiques additionnelles et particulièrement intéressantes de l'invention, le montage et l'organisation géométrique des plaques 13 est tel que les plaques 13 forment un tapis de protection 15 continu protégeant la paroi interne 2A dans la zone de combustion 4 sur une section complète de révolution en considération du sens circulaire F1, ledit tapis 15 comprenant au moins deux rangées R1, R2 continues de plaques 13 qui sont en recouvrement partiel en considération du sens longitudinal X-X'.According to additional and particularly advantageous features of the invention, the mounting and the geometric organization of the plates 13 is such that the plates 13 form a continuous protective mat 15 protecting the inner wall 2A in the combustion zone 4 on a complete section of revolution in consideration of the circular direction F1, said belt 15 comprising at least two continuous rows R1, R2 of plates 13 which are partially overlapping in consideration of the longitudinal direction X-X '.

On peut ainsi obtenir une structure à double recouvrement partiels à la fois dans le sens circulaire F1 et dans le sens longitudinal X-X' de telle sorte qu'on obtient un tapis de protection 15 qui assure une protection complète de la paroi interne 2A empêchant tout passage des produits granuleux 25 chauds à travers la structure continue du tapis de protection 15 en direction de la paroi interne 2A et dans l'interface 35 ménagée entre les plaques 13 et la paroi interne 2A.It is thus possible to obtain a partial overlap structure both in the circular direction F1 and in the longitudinal direction XX 'so that a protective mat 15 is obtained which provides complete protection for the internal wall 2A preventing any passage. hot granular products through the continuous structure of the protective mat 15 towards the inner wall 2A and in the interface 35 formed between the plates 13 and the inner wall 2A.

Selon des caractéristiques additionnelles de l'invention, le tapis de protection 15 est formé par une succession de plusieurs rangées de plaques 13 qui sont en recouvrement formant des rangées adjacentes de plaques 13 s'étendant dans le sens longitudinal de sorte à se recouvrir partiellement dans le sens circulaire et à se recouvrir partiellement dans le sens longitudinal.According to additional features of the invention, the protective mat 15 is formed by a succession of several rows of plates 13 which overlap forming adjacent rows of plates 13 extending in the longitudinal direction so as to overlap partially in the circular direction and overlap partially in the longitudinal direction.

On peut ainsi obtenir un tapis de protection 15 qui assure une protection complète et continue de toute la surface de la paroi interne 2A qui est comprise dans la zone de combustion lorsque les plaques 13 se recouvrent mutuellement entre elles à la fois dans le sens longitudinal et dans le sens circulaire, les plaques 13 étant côte à côte.It is thus possible to obtain a protective mat 15 which provides complete and continuous protection for the entire surface of the inner wall 2A which is included in the area of combustion when the plates 13 overlap each other in both the longitudinal direction and in the circular direction, the plates 13 being side by side.

Selon l'invention, les plaques 13 sont de forme identiques ou appariées, facilitant ainsi leur fabrication et leur montage au sein de la zone de combustion 4.According to the invention, the plates 13 are of identical or paired shape, thus facilitating their manufacture and their assembly within the combustion zone 4.

Selon une caractéristique particulièrement intéressante de l'invention, chaque plaque 13 comprend une partie centrale 20 avec deux côtés opposés à partir desquels s'étendent deux ailes opposées 21, 22, de part et d'autre du plan général d'extension P de la partie centrale 20. Ainsi, chaque aile 21, 22 s'étend d'un côté et de l'autre du plan P, où, ce qui revient au même au-dessus ou en-dessous du pian P.According to a particularly advantageous feature of the invention, each plate 13 comprises a central portion 20 with two opposite sides from which extend two opposite wings 21, 22, on either side of the general plane of extension P of the central portion 20. Thus, each wing 21, 22 extends on one side and the other of the plane P, where, which amounts to the same above or below the plane P.

De manière particulièrement avantageuse, la partie centrale 20 et les deux ailes 21, 22 sont sensiblement planes ou légèrement courbes dans le sens circulaire pour s'adapter au diamètre de l'enceinte cylindrique 2 tel qu'illustré aux figures.Particularly advantageously, the central portion 20 and the two wings 21, 22 are substantially flat or slightly curved in the circular direction to fit the diameter of the cylindrical chamber 2 as shown in the figures.

De manière particulièrement avantageuse, la partie centrale plane ou courbe 20 et les deux ailes planes ou courbes 21, 22 ont une forme de quadrilatère.Particularly advantageously, the flat or curved central portion 20 and the two planar or curved wings 21, 22 have a quadrilateral shape.

Tel qu'illustré aux figures, la partie centrale plane 20 a une forme générale de rectangle ou de carré ou de losange, de dimensions en moyenne, respectivement dans le sens circulaire et longitudinal, comprises entre 150 et 600 mm, plus précisément entre 150 et 400 mm Les ailes planes ou courbes 21, 22 ont une forme générale de rectangle de dimensions moyennes respectivement dans le sens circulaire comprises entre 10 et 50 mm.As illustrated in the figures, the flat central part 20 has a general shape of rectangle or square or diamond, of average dimensions, in the circular and longitudinal direction respectively, of between 150 and 600 mm, more precisely between 150 and 400 mm The planar or curved wings 21, 22 have a general shape of rectangle of average dimensions respectively in the circular direction of between 10 and 50 mm.

Bien évidemment, et à titre de variante, les plaques 13 pourront varier dans leur forme et leurs dimensions géométriques et présenter par exemple une certaine courbure, voire posséder des formes géométriques diverses et autres qu'un quadrilatère, l'essentiel étant qu'elles puissent être montées en relation les unes avec les autres de manière à se recouvrir mutuellement et partiellement dans le sens longitudinal et dans le sens circulaire afin de réaliser une protection efficace de la paroi interne 2A et s'opposer au passage des produits granuleux 5 dans l'interface 35.Of course, and by way of a variant, the plates 13 may vary in their shape and their geometrical dimensions and for example present a certain curvature, or even possess various geometric shapes and other than a quadrilateral, the essential being that they can being connected to each other so as to overlap each other and partially in the longitudinal direction and in the circular direction in order to effectively protect the inner wall 2A and to oppose the passage of the granular products 5 into the interface 35.

Tel qu'illustré en particulier aux figures 6 et 7, les plaques 13 sont positionnées dans chaque rangée pour que, en considération du sens circulaire F1, chaque plaque 13 soit reliée à une plaque dite supérieure 13S (figure 7) et une plaque 13 dite inférieure 131 voisines, les deux ailes 21, 22 de chaque plaque 13 étant disposées l'une au-dessus de l'autre en formant ainsi une aile dite supérieure 21 S et une aile dite inférieure 21I de sorte que l'aile supérieure 21S d'une plaque 13 recouvre l'aile inférieure 211 de la plaque supérieure voisine et l'aile inférieure 211 soit recouverte par l'aile supérieure de la plaque inférieure et ainsi de suite.As illustrated in particular in Figures 6 and 7 , the plates 13 are positioned in each row so that, in consideration of the circular direction F1, each plate 13 is connected to a so-called upper plate 13S ( figure 7 ) and a plate 13 said lower 131 adjacent, the two wings 21, 22 of each plate 13 being disposed one above the other thus forming a so-called upper wing 21 S and a so-called lower wing 21I so that the upper wing 21S of a plate 13 covers the lower flange 211 of the neighboring upper plate and the lower flange 211 is covered by the upper flange of the lower plate and so on.

Grâce à ce montage et à la configuration de chaque plaque 13, on réussit ainsi à former une zone de recouvrement entre deux plaques adjacentes qui est formée par une aile supérieure 21 qui vient recouvrir une aile inférieure 22 permettant ainsi d'éviter le passage des produits granuleux 25 dans l'interface 35 lors de la rotation du four 1. Le recouvrement entre les ailes inférieures 22 et les ailes supérieures 21 illustré à la Figure 8 n'est toutefois de préférence pas étanche et il existe par exemple par construction et montage un interstice longitudinal 200 de faible épaisseur permettant la création d'un passage d'air ou de fluide. Ceci permet de réinjecter de l'air ambiant, et/ou de l'air extérieur et/ou des fumées de recyclage provenant d'une conduite de recyclage 46, latéralement, par exemple par l'interface annulaire 35 sans perturber la flamme 11, l'air et/ou les fumées pouvant ainsi pénétrer doucement à travers les interstices longitudinaux 200 ménagés entre les plaques 13 adjacentes, dans la zone de combustion 4. Cette fonction de création d'un passage d'air ou de fluide peut par ailleurs être assurée par des espaces transversaux inter-plaques 29, en complément des interstices longitudinaux 200 ou à la place de ces derniers.By virtue of this arrangement and the configuration of each plate 13, it is thus possible to form a zone of overlap between two adjacent plates which is formed by an upper wing 21 which covers a lower wing 22 thus making it possible to avoid the passage of the products. in the interface 35 during the rotation of the furnace 1. The overlap between the lower flanges 22 and the upper flanges 21 illustrated in FIG. Figure 8 However, it is preferably not waterproof and there exists for example by construction and mounting a longitudinal gap 200 of small thickness for the creation of an air passage or fluid. This makes it possible to reinject ambient air, and / or outside air and / or recycling fumes from a recycling line 46, laterally, for example through the annular interface 35 without disturbing the flame 11, the air and / or the fumes can thus penetrate gently through the longitudinal interstices 200 formed between the adjacent plates 13, in the combustion zone 4. This function of creating an air passage or fluid can also be provided by inter-plate transverse spaces 29, in addition to the longitudinal gaps 200 or instead of these.

A titre purement indicatif le plan d'extension des ailes 21, 22 forme un angle β (figure 8) qui est de l'ordre de 45 degrés par rapport au plan d'extension P de la partie centrale 20, lequel angle est bien évidemment amené à varier selon le diamètre de l'enceinte 2.For purely indicative purposes, the plane of extension of the wings 21, 22 forms an angle β ( figure 8 ) which is of the order of 45 degrees relative to the extension plane P of the central portion 20, which angle is obviously caused to vary according to the diameter of the chamber 2.

Tel qu'illustré, en particulier aux figures 2 et 4, la pluralité de plaques 13 forme un cône convergent (figure 4) ou divergent (figure 2) en considération du sens F de circulation des produits granuleux au sein de l'enceinte 2.As illustrated, particularly in Figures 2 and 4 the plurality of plates 13 form a convergent cone ( figure 4 ) or diverge ( figure 2 ) in consideration of the flow direction F granular products within the chamber 2.

Il doit être noté que la variante de la figure 4 ne diffère de celle de la figure 2 que par la forme convergente tronconique de la zone de combustion 4 utilisée dans des dispositifs à contre-courant au lieu d'une forme divergente tronconique utilisée dans les dispositifs à flux parallèles de la figure 2.It should be noted that the variant of figure 4 does not differ from that of the figure 2 only by the frustoconical convergent shape of the combustion zone 4 used in countercurrent devices instead of a frustoconical divergent shape used in parallel flow devices of the figure 2 .

Selon une version particulièrement avantageuse de l'invention, les plaques 13 sont montées avec une inclinaison et forment un angle α (figure 2 ou 4) correspondant à l'angle formé entre le plan horizontal PH et le plan d'extension général P de la partie centrale 20 de chaque plaque.According to a particularly advantageous version of the invention, the plates 13 are mounted with an inclination and form an angle α ( figure 2 or 4 ) corresponding to the angle formed between the horizontal plane PH and the general extension plane P of the central portion 20 of each plate.

L'angle α est compris avantageusement entre 0 et 5 degrés environ, cette dernière valeur formant le maximum envisageable sur le plan pratique, étant entendu que la forme des plaques est adaptée à la configuration géométrique divergente ou convergente du cône formé.The angle α is advantageously between 0 and about 5 degrees, the latter value forming the maximum practically feasible, it being understood that the shape of the plates is adapted to the divergent or convergent geometric configuration of the formed cone.

Le dispositif selon l'invention peut comprendre un système de recyclage 40 des fumées produites lors de la fabrication des produits enrobés dans l'enceinte 2, ledit système recyclant les fumées dans l'interface 35.The device according to the invention may comprise a system 40 for recycling the fumes produced during the manufacture of the products embedded in the enclosure 2, said system recycling the fumes in the interface 35.

De manière particulièrement avantageuse, le système de recyclage 40 est connecté en sortie d'enceinte 2 et comprend, un filtre 43 à manches, un moyen d'extraction 45 et une conduite de recyclage 46 débouchant dans l'interface 15.In a particularly advantageous manner, the recycling system 40 is connected to the output of the enclosure 2 and comprises a bag filter 43, an extraction means 45 and a recycling line 46 opening into the interface 15.

La figure 1 illustre une variante de l'invention dans laquelle le recyclage s'effectue après passage des fumées dans le filtre 43, la conduite de recyclage étant donc située en aval du filtre à manches 43. Selon une autre variante (non à illustrée), la conduite de recyclage est située ou montée en amont du filtre à manches 43.The figure 1 illustrates a variant of the invention in which the recycling is carried out after passage of the fumes in the filter 43, the recycling line is therefore located downstream of the bag filter 43. According to another variant (not shown), driving recycling station is located or mounted upstream of the bag filter 43.

Le système de recyclage 40 comporte une tubulure de sortie 47 pilotée par un volet pour diriger au besoin les fumées vers l'extérieur sans recyclage ou avec un recyclage partiel.The recycling system 40 comprises an outlet pipe 47 controlled by a flap to direct the smoke to the outside if necessary without recycling or with partial recycling.

La conduite de recyclage 46 peut déboucher dans l'interface 35 par une ou plusieurs ouïes 48 solidaires d'un panneau de fermeture 49 de l'enceinte 2 (fig. 1 et 2).The recycling line 46 can lead into the interface 35 by one or more openings 48 integral with a closure panel 49 of the enclosure 2 ( Fig. 1 and 2 ).

Grâce au système de recyclage on assure un meilleur brulage des fumées ce qui contribue à diminuer leur toxicité tout en injectant des gaz refroidis dans l'interface 35 de la zone de combustion 4 ce qui contribue à entretenir une lame d'air isolante à faible température à ce niveau. De l'enceinte 2. Ceci favorise le maintien d'un bonne isolation thermique, évite le colmatage et permet d'alimenter la zone de combustion avec une masse d'agrégats fortement chargé en voire totalement chargée en matériaux recyclés sans craindre un colmatage.Thanks to the recycling system is ensured a better burning fumes which helps reduce their toxicity while injecting cooled gases in the interface 35 of the combustion zone 4 which helps maintain a blade of insulating air at low temperatures at this level. The enclosure 2. This promotes the maintenance of good thermal insulation, avoids clogging and allows to feed the combustion zone with a mass of heavily loaded aggregates or even fully loaded with recycled materials without fear of clogging.

L'invention concerne également un procédé de fabrication de produits enrobés, par exemple avec du bitume dans un four rotatif pourvu d'une enceinte ayant une paroi interne ainsi qu'une zone de combustion et définissant un sens circulaire et un sens longitudinal, ledit procédé étant tel qu'on assure la protection thermique de la paroi interne en entretenant une lame d'air continue et d'épaisseur suffisante dans une interface (35) créée entre la paroi interne (2A) et une pluralité de plaques (13) s'étendant à distance de ou contre la paroi interne (2A), lesdites plaques se recouvrant mutuellement de manière partielle en considération du sens circulaire (F1) et du sens longitudinal X-X'.The invention also relates to a process for producing coated products, for example with bitumen in a rotary kiln provided with an enclosure having an inner wall and a combustion zone and defining a circular direction and a longitudinal direction, said method being such as provides thermal protection of the inner wall by maintaining a continuous air gap and sufficient thickness in an interface (35) created between the inner wall (2A) and a plurality of plates (13) s' extending at a distance from or against the inner wall (2A), said plates overlapping each other partially in consideration of the circular direction (F1) and the longitudinal direction X-X '.

De manière avantageuse, le procédé est tel que la lame d'air est entretenue par recyclage de tout ou partie des fumées résultant de la fabrication des produits enrobés directement dans l'interface 35. La forme tronconique du réseau de plaques 13 favorise le renouvellement de la lame d'air qui peut s'écouler par fuite entre les espaces 29 inter plaques (fig. 3 et 7) précités.Advantageously, the process is such that the air knife is maintained by recycling all or part of the fumes resulting from the manufacture of the coated products directly in the interface 35. The frustoconical shape of the plate network 13 promotes the renewal of the air gap that can leak out between the inter-plate spaces 29 ( Fig. 3 and 7 ) above.

Le dispositif de fabrication de produits enrobés selon l'invention fonctionne de la manière suivante :

  • Le moyen de chauffe 10 étant activé et fournissant une flamme 11, et le four étant mis en rotation dans le sens F1, les produits enrobés 25 peuvent être acheminés dans la zone de combustion 4 par l'intermédiaire de l'entrée principale 3.
The device for manufacturing coated products according to the invention operates as follows:
  • The heating means 10 being activated and providing a flame 11, and the oven being rotated in the direction F1, the coated products 25 can be conveyed into the combustion zone 4 via the main inlet 3.

Les produits granuleux 25 vierges non enrobés ou au contraire les produits granuleux 25 recyclés ou un mélange des deux viennent alors se déverser par la canalisation 5 au début de la zone de combustion 4 au sein de laquelle le tapis de protection 15 formé des plaques 13 est, comme le reste de l'enceinte, mis en rotation.Uncoated virgin granular products or, on the contrary, the recycled granular products or a mixture of the two then pour out through the line 5 at the beginning of the combustion zone 4 in which the protective belt 15 formed of the plates 13 is, like the rest of the enclosure, rotated.

Tel qu'illustré en particulier à la figure 5, la mise en rotation de l'enceinte 2 et en particulier le tronc de cône formé par la pluralité de plaques 13 en recouvrement partiel permet d'assurer un avancement progressif des produits granuleux 25 et un léger déplacement circulaire des produits dans la zone basse par le biais des ailes 21, 22 positionnée en recouvrement mutuel lesquelles forment une série de gradins ou de marches successifs. Les produits granuleux 25, tout en progressant continuellement selon la flèche F au sein de l'enceinte 2 dans le sens longitudinal, sont constamment remués au fond de la zone de combustion 4 tout en progressant continuellement au sein du four rotatif pour atteindre la zone de séchage 6 puis enfin la zone de malaxage 7. Le recyclage des fumées aspirées par le moyen d'extraction 45, du type ventilateur, renouvelle continuellement la lame d'air renforçant ainsi son efficacité d'isolation.As illustrated in particular in figure 5 , the rotation of the chamber 2 and in particular the truncated cone formed by the plurality of plates 13 in partial overlap makes it possible to ensure a gradual advance of the granular products 25 and a slight circular displacement of the products in the low zone by the wings 21, 22 positioned in mutual overlap which form a series of steps or successive steps. The granular products 25, while progressing continuously along the arrow F in the chamber 2 in the longitudinal direction, are constantly stirred at the bottom of the combustion zone 4 while progressing continuously within the rotary kiln to reach the zone of combustion. drying 6 and finally the mixing zone 7. The recycling of the fumes sucked by the extraction means 45, of the fan type, continually renews the air gap, thus reinforcing its insulation efficiency.

Au cours de la progression au sein du four rotatif, les produits granuleux 25 sont bien évidemment progressivement séchés puis ensuite enrobés dans la zone de malaxage 7 par mise en contact avec du bitume et/ou d'autres ingrédients d'enrobage.During the progression within the rotary kiln, the granular products are of course gradually dried and then coated in the kneading zone 7 by contact with bitumen and / or other coating ingredients.

Le recours à une pluralité de plaques 13 se recouvrant mutuellement et partiellement dans le sens circulaire et longitudinal en formant une sorte de tapis protecteur à écailles et à double recouvrement oblige les granulats à rester constamment au-dessus des plaques 13 ce qui évite tout colmatage, le mouvement des granulats étant constant dans tous les sens géométriques.The use of a plurality of plates 13 overlapping each other and partially in the circular and longitudinal direction forming a kind of protective mat scales and double overlap forces the aggregates to remain constantly above the plates 13 which prevents clogging, the movement of aggregates being constant in all geometric directions.

Ceci permet d'avoir une grande liberté dans la composition des matériaux granuleux 25 alimentant la zone de combustion 4, les matériaux granuleux 25 pouvant être neufs et froids et / ou des produits bitumineux usagés voire un mélange des deux, la proportion pouvant être comprise entre 0 et 100 %. Ainsi, le dispositif de fabrication conforme à l'invention peut, sans risque de colmatage, assurer la fabrication de produits bitumineux à partir de 0 % de matériaux granuleux neufs et froids et de 100% de matériaux granuleux bitumineux usagés et donc recyclés ou d'un mélange dans des proportions quelconque des deux.This makes it possible to have great freedom in the composition of the granular materials 25 feeding the combustion zone 4, the granular materials that can be new and cold and / or used bituminous products or a mixture of the two, the proportion that can be between 0 and 100%. Thus, the manufacturing device according to the invention can, without risk of clogging, ensure the manufacture of bituminous products from 0% of new and cold granular materials and 100% of used bituminous materials and therefore recycled or recycled. a mixture in any proportion of the two.

Le dispositif conforme à l'invention permet également de limiter fortement les zones d'usure de l'enceinte 2 en général et de faciliter la maintenance de l'ensemble du dispositif. Il s'avère en effet possible de changer seulement une ou plusieurs plaques 13 en cas d'usure, sans avoir à changer la totalité des pièces constituant la zone de combustion 4.The device according to the invention also makes it possible to strongly limit the wear zones of the enclosure 2 in general and to facilitate the maintenance of the entire device. It is indeed possible to change only one or more plates 13 in case of wear, without having to change all the parts constituting the combustion zone 4.

Enfin, le réseau de plaques 13, en raison du recouvrement mutuel des plaques 13 voisines dans deux directions de l'espace, fournit une bonne isolation thermique de la paroi interne 2A du four par création d'une lame d'air continue sur toute la surface interne de l'enceinte dans l'interface 35.Finally, the network of plates 13, due to the mutual overlap of the neighboring plates 13 in two directions of space, provides good thermal insulation of the inner wall 2A of the furnace by creating a continuous air gap over the entire internal surface of the enclosure in the interface 35.

Ce dispositif permet enfin de supprimer les dispositifs complémentaires d'introduction de produits bitumineux usagés que l'on veut recycler et qui sont en général situés en aval de la flamme 11 dans les dispositifs de l'art antérieur, En effet, l'absence d'apparition du phénomène classique de colmatage dans la zone de combustion 4 grâce au dispositif de l'invention, permet d'alimenter directement la zone de combustion 4 avec des produits granuleux recyclés en très forte proportion voire en totalité.This device finally makes it possible to eliminate the additional devices for introducing used bituminous products that are to be recycled and which are generally situated downstream of the flame 11 in the devices of the prior art. Indeed, the absence of the appearance of the classic clogging phenomenon in the combustion zone 4 by virtue of the device of the invention makes it possible to supply the combustion zone 4 directly with granular products recycled in a very large proportion or even totally.

POSSIBILITE D'APPLICATION INDUSTRIELLEPOSSIBILITY OF INDUSTRIAL APPLICATION

L'invention trouve son application industrielle dans la conception et l'utilisation de dispositifs et procédés de fabrication de produits enrobés, par exemple de produits enrobés bitumineux.The invention finds its industrial application in the design and use of devices and processes for manufacturing coated products, for example bituminous coated products.

Claims (16)

  1. Device for manufacturing products coated with bitumen, comprising:
    - a furnace (1) comprising a substantially cylindrical chamber (2) intended to be rotated about its longitudinal axis (X-X') by a drive means and defining a circular direction and a longitudinal direction, said chamber (2) having an internal wall (2A) and being provided, towards its two opposite ends, firstly with a main inlet (3) intended to receive non-coated or recycled raw granular products (25) or a mixture of the two, of the broken stone or aggregate type, and secondly a discharge (30) for the bituminous coated products manufactured in the chamber (2), said granular products (25) travelling from the main inlet (3) towards the discharge (30) in order to be transformed into coated products at the discharge (30) after passing through and treatment in the chamber (2),
    - a heating means (10) defining a combustion zone (4) in the chamber (2) and generating a drying stream able to dry the granular products (25),
    - protection means for the internal wall (2A) of the chamber (2) that are situated in the combustion zone (4),
    characterised in that the protection means are formed by a plurality of plates (13) extending at a distance from or against said internal wall (2A) and partially overlapping mutually with regard to the circular direction (F1) and the longitudinal direction in order to provide thermal protection of the internal wall (2A) by creating a layer of air in the interface (15) created between the internal wall (2A) and the plurality of plates (13).
  2. Device according to claim 1, characterised in that the plates (13) form a continuous protective mat (15) protecting the internal wall (2A) in the combustion zone (4) over a complete section of revolution with regard to the circular direction (F1), said mat comprising at least two continuous rows of plates (13) partially overlapping with regard to the longitudinal direction.
  3. Device according to claim 2, characterised in that the protective mat (15) is formed by a succession of a plurality of rows of overlapping plates forming adjacent rows of plates (13) extending in the longitudinal direction.
  4. Device according to one of claims 1 to 3, characterised in that the plates (13) have identical or matching shapes and dimensions.
  5. Device according to one of the preceding claims, characterised in that each plate (13) comprises a central part (20) with two opposite sides from which two flanges (21, 22) extend on either side of the overall extension plane (P) of the central part.
  6. Device according to claim 5, characterised in that the central part (20) and the two flanges (21, 22) are substantially planar.
  7. Device according to one of claims 5 to 6, characterised in that the planar central part (20) and the two planar flanges (21, 22) are in the form of a quadrilateral.
  8. Device according to one of claims 5 to 7, characterised in that the plates (13) are positioned in each row so that, with regard to the circular direction (F1), each plate (13) is connected to a so-called upper plate (13S) and a so-called lower plate (13I) that are adjacent, the two flanges (21, 22) of each plate (13) being disposed one above the other, thus forming a so-called top flange (21S) and a so-called bottom flange (22I) so that the top flange (21S) of one plate (13) covers the bottom flange (22I) of the adjacent upper plate (21S) and the bottom flange (22I) is covered by the top flange (21S) of the lower plate.
  9. Device according to one of claims 5 to 8, characterised in that the extension plane of the flanges (21, 22) forms an angle β with the extension plane (P) of the central part (20).
  10. Device according to one of the preceding claims, characterised in that the plurality of plates (13) forms a convergent or divergent cone.
  11. Device according to claim 10, characterised in that, within the cone, the plates (13) are mounted with an inclination and form an angle α corresponding to the angle formed between the horizontal plane and the extension plane of the central part.
  12. Device according to claim 11, characterised in that the angle α is between 0 and 5 degrees.
  13. Device according to one of the preceding claims, characterised in that it comprises a system (40) for recycling the fumes produced during the manufacture of the coated products in the chamber (2), said system recycling the fumes in the interface (15).
  14. Device according to claim 13, characterised in that the recycling system (40) is connected to the chamber at its discharge (2) and comprises a filter (43), an extraction means (45) and a recycling conduit (46) emerging in the interface (15).
  15. Method for manufacturing products coated with bitumen in a rotary furnace provided with a chamber having an internal wall and a combustion zone and defining a circular direction and a longitudinal direction, said method being characterised in that the thermal protection of the internal wall is provided by maintaining a continuous layer of air of sufficient thickness in an interface (35) created between the internal wall (2A) and a plurality of plates (13) extending at a distance from or against the internal wall (2A), said plates partially overlapping mutually with regard to the circular direction (F1) and the longitudinal direction.
  16. Method according to claim 15, characterised in that the layer of air is maintained by recycling all or some of the fumes resulting from the manufacture of the coated products, directly in the interface (35).
EP13704198.4A 2012-01-25 2013-01-24 Device and method for producing coated products, for example bituminous coated products, with protection plates Active EP2807305B1 (en)

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FR1250732A FR2986016B1 (en) 2012-01-25 2012-01-25 DEVICE AND METHOD FOR MANUFACTURING COATED PRODUCTS, FOR EXAMPLE OF BITUMINOUS COATED PRODUCTS, WITH PROTECTIVE PLATES
PCT/FR2013/050149 WO2013110896A1 (en) 2012-01-25 2013-01-24 Device and method for producing coated products, for example bituminous coated products, with protection plates

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FR2989393B1 (en) * 2012-04-13 2014-06-06 Argumat DEVICE FOR MANUFACTURING DERIVED OUTPUT HOT PRODUCTS AND EXTERNAL MIXER AND PROCESS FOR PRODUCING CORRESPONDING HOT COILS
WO2020200450A1 (en) * 2019-04-04 2020-10-08 Ammann Schweiz Ag Combustion chamber for a hot gas generator of an asphalt production plant with air baffles and method for securing the air baffles
CN111455780B (en) * 2020-04-20 2021-11-16 枣庄旗胜建设集团有限公司 Asphalt foaming device
DE102022211106B4 (en) * 2022-10-20 2024-06-06 Benninghoven Zweigniederlassung Der Wirtgen Mineral Technologies Gmbh Flame protection device for a burner, lamella for such a flame protection device and drying drum with such a flame protection device
CN117127456A (en) * 2023-08-24 2023-11-28 廊坊德基机械科技有限公司 Automatic antiseized regeneration drying cylinder barrel of accuse temperature
CN116905313B (en) * 2023-09-12 2023-12-05 福建省铁拓机械股份有限公司 Double-return-stroke internal circulation asphalt mixture drying roller

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ATE5904T1 (en) * 1980-02-12 1984-02-15 Creusot-Loire DEVICE FOR THE MANUFACTURE OF COATED BITUMINOUS PRODUCTS FOR ROAD COATINGS.
US5203693A (en) * 1991-10-01 1993-04-20 Astec Industries, Inc. Rotary drum dryer having internal flights
IT1257637B (en) * 1992-02-04 1996-02-01 DRYER-MIXER WITH DRUM FOR THE CONTINUOUS CYCLE PREPARATION OF BITUMINOUS CONGLOMERATES WITH RECYCLING OF RECOVERY MATERIALS
US7343697B2 (en) * 2005-05-31 2008-03-18 Dillman Equipment, Inc. Low profile flights for use in a drum
ATE536443T1 (en) * 2009-07-09 2011-12-15 Ammann Italy S P A DRYING DRUM FOR SYSTEMS FOR THE PRODUCTION OF BITUMINOUS MIXTURES USING RECYCLING MATERIAL

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FR2986016B1 (en) 2014-03-21
WO2013110896A1 (en) 2013-08-01
CA2862236C (en) 2020-03-24
US9957674B2 (en) 2018-05-01
CA2862236A1 (en) 2013-08-01
US20150030767A1 (en) 2015-01-29
FR2986016A1 (en) 2013-07-26
EP2807305A1 (en) 2014-12-03

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