EP2549017A1 - Drehzylindertrockner für Mischungen aus primären Inertmaterialien und Rückgewinnungsmaterialien zur Herstellung von Bitumenzusammensetzungen - Google Patents

Drehzylindertrockner für Mischungen aus primären Inertmaterialien und Rückgewinnungsmaterialien zur Herstellung von Bitumenzusammensetzungen Download PDF

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Publication number
EP2549017A1
EP2549017A1 EP12177187A EP12177187A EP2549017A1 EP 2549017 A1 EP2549017 A1 EP 2549017A1 EP 12177187 A EP12177187 A EP 12177187A EP 12177187 A EP12177187 A EP 12177187A EP 2549017 A1 EP2549017 A1 EP 2549017A1
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EP
European Patent Office
Prior art keywords
cylinder
smokes
outlet opening
dryer
virgin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12177187A
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English (en)
French (fr)
Inventor
Stefano Belloli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bernardi Impianti International SpA
Original Assignee
Bernardi Impianti International SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bernardi Impianti International SpA filed Critical Bernardi Impianti International SpA
Publication of EP2549017A1 publication Critical patent/EP2549017A1/de
Withdrawn legal-status Critical Current

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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
    • E01C19/05—Crushing, pulverising or disintegrating apparatus; Aggregate screening, cleaning, drying or heating apparatus; Dust-collecting arrangements specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/028—Arrangements for the supply or exhaust of gaseous drying medium for direct heat transfer, e.g. perforated tubes, annular passages, burner arrangements, dust separation, combined direct and indirect heating
    • 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

Definitions

  • the present invention relates to a rotary cylinder dryer for mixtures of virgin inerts and recovery materials (RAP) for preparing bituminous conglomerates.
  • RAP virgin inerts and recovery materials
  • bituminous conglomerates mixtures of virgin inerts, which consist for example of pebble gravel, sand and rock shots, and recovery materials, which in particular consist of material resulting from the dismantling of old bituminous conglomerate flooring and commonly referred to as RAP (Reclaimed Asphalt Pavement), have long been used. Before mixing such mixtures with a bituminous binder it is necessary to eliminate the humidity present therein through a drying process.
  • Dryers generally of the rotary cylinder type, are generally used to this end.
  • a dryer of this type is described, for example, in patent application no. MI2008A02312 ( EP2202473 ) in the name of the same Applicant and it comprises a cylinder with axis inclined with respect to the horizontal placed in rotation about its own axis by motor means and provided, at one of its two opposite heads, with an inlet mouth for the virgin and recovery materials to be dried, already mutually mixed, and at the opposite head, with an outlet mouth for the dried materials.
  • the heat required for drying is generated by a burner placed at the head where the outlet mouth of the dried materials is defined and which is coaxial to the cylinder.
  • the combustion and drying smokes are vented through an opening obtained at the head where the inlet mouth of the materials to be dried is defined and which leads into a chamber that is associated with a suction assembly with the interposition of a filter assembly, generally of the bag type.
  • a tubular body open at the opposite ends is fixed inside the cylinder.
  • One of the two open ends of the tubular body faces the burner and is placed at a definite distance therefrom, so that the flame and the combustion smokes are directed into the tubular body, whereas the opposite open end of the tubular body faces the inside of the cylinder.
  • the burner and tubular body assembly define a combustor or post-combustor crossed by both the combustion smokes of the burner and by the drying smokes, which are sucked thereinto by dynamic effect.
  • the drying smokes result from the drying of recovery material containing aged bitumen (RAP) which, together with virgin materials, advance on the bottom of the interspace defined between the cylinder and the tubular body.
  • RAP aged bitumen
  • tubular body forms a hot combustion and/or post-combustion chamber.
  • This known dryer has proved to be particularly advantageous, in particular allowing mixtures containing recovery materials (RAP) in percentages up to 40% by weight to be dried and mixed.
  • RAP recovery materials
  • the suction unit that sucks the combustion and drying smokes from the inside of the cylinder, where they are formed, and which forces them to cross the filter assembly to then convey them to the stack, is capable of placing the entire cylinder, the filter and the connecting piping to vacuum.
  • the filter assembly consists of a bag filter and the fine powders that reach it are retained therein.
  • RAP recovery material
  • Such humidity condensates into dew which on the one hand packs the fine powders in the filter bags and on the other hand causes a reduction in the temperature of the same filter, greatly reducing the filtering capacity thereof and favoring the forming of further condensation.
  • the object of the present invention is to obviate the drawbacks of known dryers and in particular to propose a rotary cylinder dryer for mixtures of virgin inerts and recovery materials (RAP) for preparing bituminous conglomerates which allows the reduction of the clogging of the filter assembly bags by the fine powders of the treated material, in particular of recovery material (RAP) and thereby allows the maintenance and replacement works on the bags of the filter assembly to be limited and an efficient filtering of the smokes to be ensured prior to their release to the atmosphere.
  • RAP virgin inerts and recovery materials
  • reference numeral 10 globally denotes a rotary cylinder dryer for mixtures of virgin inerts and recovery materials (RAP) for preparing bituminous conglomerates.
  • Dryer 10 comprises a cylinder 11 rotatably supported about its longitudinal axis A by supports 12 mounted on a frame 13 resting on the ground.
  • Motor means 14 are mounted on frame 13 which, through driving means 15, for example of the gear type, place cylinder 11 in rotation about its longitudinal axis A.
  • the longitudinal axis A of cylinder 11 is inclined with respect to the horizontal plane or the support plane of frame 13 by an angle ⁇ in the order of a few degrees, typically 3°.
  • Cylinder 11 is delimited at its opposite ends by two heads, respectively a first head 16 at higher height and a second head 17 at smaller height.
  • An inlet mouth 18 of a mixture of virgin inerts and recovery materials (RAP, Reclaimed Asphalt Pavement) to be dried is defined at the first head 16, whereas an outlet mouth 19 of the dried mixture is defined at the second head 17.
  • RAP virgin inerts and recovery materials
  • the heat required for drying is generated by a corresponding assembly consisting of at least one burner 20 associated with the second head 17 and placed coaxially to the longitudinal axis A of cylinder 11 into which it directs the flame.
  • an outlet opening 21 of the discharge smokes of the dryer 10 is defined at the first head 16, the outlet opening 21 communicates with a suction chamber 22 in turn associable with a unit for sucking and treating the discharge smokes of the dryer 10 and not shown in detail as it is known by the man skilled in the art.
  • Means for mixing and moving the inerts and the recovery material (RAP) treated are mounted on the inner side surface of the cylinder 11 which mix and accompany them in their advance motion along the entire cylinder 11, from the inlet mouth 18 to the outlet mouth 19.
  • the inlet mouth 18 and the outlet mouth 19 of the mixture are obtained at the opposite ends (heads) of the cylinder 11, as the burner 20 and the outlet opening 21 of the discharge smokes are placed at the opposite ends (heads) of the cylinder 11; this allows the entire length of the cylinder 11 to be used for the thermal exchange between the heat generated by burner 20 and the mixture treated.
  • a tubular body 23 open at the opposite ends 23a, 23b is fixed inside the cylinder 11 and placed coaxially to the longitudinal axis A of the cylinder 11 with one of its open ends 23a facing the burner 20 and at a definite distance therefrom and with the opposite open end 23b facing the first head 16.
  • the tubular body 23 has a maximum diameter smaller than the inner diameter of the cylinder 11 so as to form an annular interspace therewith crossed by the drying mixture on the bottom.
  • the combustion smokes and the flame generated by the burner 20 are axially directed into the tubular body 23, inside which the drying smokes of the drying mixture, which advances on the bottom of the interspace defined between cylinder 11 and the tubular body 23, also without impacting the latter, are sucked by dynamic effect.
  • an auxiliary tubular body 24 is placed, which is also open at the opposite ends 24a, 24b, fixed inside the cylinder 11 and placed coaxially to the longitudinal axis A of the same cylinder 11.
  • the auxiliary tubular body 24 is arranged with one of its two opposite open ends 24a facing the open end 23b of the tubular body 23 opposite to that 23a facing burner 20 and at a definite distance from it, and the opposed open end 24b directed towards the inside of cylinder 11 and facing the first head 16.
  • the auxiliary tubular body 24 has a maximum diameter smaller than the inner diameter of the cylinder 11 and defines an interspace with it crossed by the drying mixture.
  • the combustion and drying smokes coming out of the tubular body 23 are directed into the tubular body 24, into which the smokes external thereto are also sucked by dynamic effect.
  • the tubular body 23 and the auxiliary tubular body 24 define each a respective hot combustion and/or post-combustion chamber of the combustion smokes and of the drying smokes, where the latter are generated by the fraction of recovery material (RAP) present in the drying mixture and in particular, by the aged bitumen present therein.
  • RAP fraction of recovery material
  • Both the tubular body 23 and the auxiliary tubular body 24 are made of heat resistant steel, also of different type, the second one having to withstand lower temperatures than the first one.
  • the tubular body 23 is made of AISI 310 S steel, whereas the auxiliary tubular body 24 is made of 304-306 steel.
  • the assembly consisting of the burner 20, of the tubular body 23 and of the auxiliary tubular body 24 forms a combustor or post-combustor assembly; in particular, the tubular body 23 and the auxiliary tubular body 24 form two hot chambers into which the flame and the combustion smokes are directed and the drying smokes, generated by the recovery material (RAP) or in any case the smokes present inside cylinder 11, are sucked by dynamic effect, allowing the combustion (oxidation) of the organic substances contained therein to be completed.
  • RAP recovery material
  • the distance between the tubular body 23, or better between its open end 23a, and the burner 20, as well as the distance between the tubular body 23 and the auxiliary tubular body 24, or better between their open and mutually facing ends, respectively 23b and 24a, is determined so as to ensure the desired smokes suction effect, in particular of the drying smokes, into them.
  • the assembly of the tubular body 23 and of the auxiliary tubular body 24 and the structure of such bodies are the object of a co-pending application to the same Applicant.
  • the tubular body 23 extends along at least one tract of the fourth heating area 31 and the auxiliary tubular wall 24 extends along at least one tract of the third mixing area 29.
  • Dryer 10 further comprises an assembly for heating the comburent air fed to the burner 20.
  • Such heating assembly comprises a pre-heating chamber 33 which extends behind the second head 17 and inside which the body of the burner 20 is housed.
  • a shell 34 is mounted which forms around the cylinder 11 an interspace 35 which at one end communicates with the pre-heating chamber 33 and at the opposite end with one or more inlet openings 36 of the ambient air.
  • a suction fan 37 is mounted below the frame 13 and communicates with the pre-heating chamber 33 so as to suck ambient air into it through the interspace 35. Moreover, sensing means of the sucked air temperature are provided, such as for example a thermal probe, and means for measuring the sucked air flow rate, such as for example a Pitot tube, so as to control and adjust the operation of the burner 20.
  • the air sucked from the external environment first crosses the interspace 35 wherefrom it then enters the pre-heating chamber 33 to then be fed into the cylinder 11 for supporting the combustion of the fuel injected by the burner 20.
  • a peculiar feature of the present invention is the provision of at least one deflecting baffle 38 at the outlet opening 21 of the smokes.
  • the deflecting baffle 38 extends along at least one tract of the perimeter which delimits the outlet opening 21 and extends inside cylinder 11; where the outlet opening 21 advantageously has a circular shape.
  • the deflecting baffle 38 has walls with a conical or frusto-conical surface, with a diverging taper towards the outlet opening 21 of the smokes and converging towards the inside of the cylinder 11, or better towards its longitudinal axis A.
  • a wall 39 which extends towards the inside of cylinder 11 is provided below the outlet opening 21 .
  • Wall 39 extends along at least one tract of the perimeter which delimits the outlet opening 21 and extends inside cylinder 11.
  • the wall 39 has the shape of a sector of a cylindrical surface and extends parallel to the lateral internal surface of the cylinder 11 at a definite distance from it.
  • the wall 39 extends below the channel that defines the inlet mouth 18 of the mixture and which is provided with a door 40, which can be opened, for maintenance and from which the mixture falls into the cylinder through openings defined in the wall 39.
  • the wall 39 is jointed along one side to the deflecting baffle 38.
  • the deflecting baffle 38 and the wall 39 extend in the first area 25, downstream of which the "rain” of the material lifted by the rising cups 28 is formed.
  • the arrangement of the deflecting baffle 38 depends on the sense of rotation of the cylinder 11.
  • the deflecting baffle 38 extends along at least one tract of the perimeter of the outlet opening 21 comprised in the second and third face defined by the system of Cartesian coordinates.
  • the deflecting baffle will extend along at least one tract of the perimeter of the outlet opening 21 comprised in the first and fourth face of the system of Cartesian coordinates as defined above.
  • the virgin inert material and the recovery material (RAP) are fed into the cylinder 11 through the inlet mouth 18.
  • the materials thus fed cross the first area 25 being mixed and blended by the helical blades 26.
  • the average temperature inside the cylinder 11 at the first area 25 is generally in the order of 120-150°C.
  • the mixture then advances along the second zone 27, wherein there is an average temperature in the order of 280-300°C, where the humidity contained in the materials and in particular in the recovery materials (RAP) evaporates.
  • the bitumen fraction present in the recovery materials (RAP) softens, favoring the bond with virgin inert materials; aggregates of virgin inert materials and of recovery materials (RAP) are thus formed.
  • a further mixing of the materials occurs along the third area 29 by the mixing blades 30 which, thanks to their particular arrangement and shape, object of a co-pending application to the same Applicant, impart a controlled advance motion to the materials such as to favor the forming of a substantially homogeneous mixture.
  • the mixture advances into the interspace defined between the cylinder 11 and the auxiliary tubular body 24, without contacting the latter.
  • the dried and blended mixture advances into the fourth final heating area 31 to exit from the outlet mouth 19 at an average temperature of about 180-200°C.
  • the efficiency of the burner 20 is improved thanks to the pre-heating of the comburent air.
  • the flame and the combustion smokes are directed into the tubular body 23 (inside which there is a maximum average temperature in the order of 800-900°C) and therefrom into the auxiliary tubular body 24.
  • drying smokes i.e. the smokes generated by the recovery material
  • the drying smokes are sucked by dynamic effect into the tubular body 23 and the auxiliary tubular body 24.
  • the smokes are then vented through the outlet opening 21 and the chamber 22 and conveyed in a treatment and removal assembly.
  • the deflecting baffle 38 allows the powders of material, in particular of the recovery material (RAP), which fall onto the bottom of the cylinder 11 where by the effect of the heat oxidize or are reduced, to be retained inside the cylinder 11 without reaching the filter assembly placed downstream of the cylinder 11.
  • RAP recovery material
  • the conical shape of the deflecting baffle 38 favors the fall back onto the bottom of the cylinder 11 of the powders of material deposited thereon.
  • the wall 39 contributes to retaining the powders of material inside cylinder 11 preventing them from reaching the filter assembly placed downstream of the cylinder 11 and moreover it limits the dissipation of the smokes towards the suction assembly if the latter is non operative, thus preventing the material powders pulled by the smokes from reaching the filter assembly. Thanks to the provision of at least one deflecting baffle 38 and of the lower wall 39 associated with the outlet opening 21 of the smokes, the dryer object of the present invention has the advantage that it allows the powders of inert and recovery materials formed during the drying treatment to be retained inside the drying cylinder, in particular preventing them from reaching the filter assembly placed downstream of the drying cylinder.
  • the filtering efficiency of the filter assembly is thus preserved, thereby reducing the maintenance and replacement works on the bags of the same filter and limiting the release of fine powders to the atmosphere.
  • the presence of the auxiliary tubular body 24 in a succession to the tubular body 23 allows to further reduce, compared to the known dryers, the percentages of volatile organic substances (VOC, TOC) present in the discharge smokes in compliance with the regulations in force, irrespective of the nature of the virgin inert materials and of the recovery materials (RAP) and also for percentages of recovery materials (RAP) higher than 25% and even in the order of 40%.
  • the pre-heating of the comburent air improves the combustion efficiency in terms of fuel saving in the order of 10%-20%.
  • the particular shape and arrangement of the mixing blades 30 allows homogeneous mixtures to be obtained.
  • temperatures indicated in the present description are purely indicative, depend on the flow rate and type of both the virgin inert material and the recovery material (RAP), on the fuel used, on the ambient air temperature and on the temperature the material must be heated to.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP12177187A 2011-07-20 2012-07-19 Drehzylindertrockner für Mischungen aus primären Inertmaterialien und Rückgewinnungsmaterialien zur Herstellung von Bitumenzusammensetzungen Withdrawn EP2549017A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT001354A ITMI20111354A1 (it) 2011-07-20 2011-07-20 Essiccatoio a cilindro rotante per miscele di inerti vergini e materiali di recupero per la preparazione di conglomerati bituminosi

Publications (1)

Publication Number Publication Date
EP2549017A1 true EP2549017A1 (de) 2013-01-23

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Application Number Title Priority Date Filing Date
EP12177187A Withdrawn EP2549017A1 (de) 2011-07-20 2012-07-19 Drehzylindertrockner für Mischungen aus primären Inertmaterialien und Rückgewinnungsmaterialien zur Herstellung von Bitumenzusammensetzungen

Country Status (4)

Country Link
EP (1) EP2549017A1 (de)
CN (1) CN102889761A (de)
IT (1) ITMI20111354A1 (de)
RU (1) RU2012130865A (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095285A (en) * 1975-10-08 1978-06-13 Creusot-Loire Device for the preparation of coated products for construction and maintenance of highways
DE3628106A1 (de) * 1986-08-19 1988-02-25 Bagela Baumaschinen Gmbh & Co Umlauffaehige mischtrommel fuer asphaltaufbereiter
US5558432A (en) * 1994-06-14 1996-09-24 Swisher, Jr.; George W. Drum mixer having a combined heating/mixing zone with aggregate entry at both ends
EP2202473A1 (de) 2008-12-23 2010-06-30 Bernardi Impianti International S.P.A. Trockner für inertes Material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095285A (en) * 1975-10-08 1978-06-13 Creusot-Loire Device for the preparation of coated products for construction and maintenance of highways
DE3628106A1 (de) * 1986-08-19 1988-02-25 Bagela Baumaschinen Gmbh & Co Umlauffaehige mischtrommel fuer asphaltaufbereiter
US5558432A (en) * 1994-06-14 1996-09-24 Swisher, Jr.; George W. Drum mixer having a combined heating/mixing zone with aggregate entry at both ends
EP2202473A1 (de) 2008-12-23 2010-06-30 Bernardi Impianti International S.P.A. Trockner für inertes Material

Also Published As

Publication number Publication date
RU2012130865A (ru) 2014-01-27
ITMI20111354A1 (it) 2013-01-21
CN102889761A (zh) 2013-01-23

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