EP2202473A1 - Trockner für inertes Material - Google Patents

Trockner für inertes Material Download PDF

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Publication number
EP2202473A1
EP2202473A1 EP09179837A EP09179837A EP2202473A1 EP 2202473 A1 EP2202473 A1 EP 2202473A1 EP 09179837 A EP09179837 A EP 09179837A EP 09179837 A EP09179837 A EP 09179837A EP 2202473 A1 EP2202473 A1 EP 2202473A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
desiccator
burner
products
inlet
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Withdrawn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
EP09179837A
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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 EP2202473A1 publication Critical patent/EP2202473A1/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Withdrawn legal-status Critical Current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
    • E01C19/10—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
    • E01C19/05—Crushing, pulverising or disintegrating apparatus; Aggregate screening, cleaning, drying or heating apparatus; Dust-collecting arrangements specially adapted therefor
    • 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
    • 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
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F26B11/0463—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall
    • F26B11/0477—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum
    • F26B11/0481—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum the elements having a screw- or auger-like shape, or form screw- or auger-like channels
    • 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 refers to an innovative desiccator for inert material, in particular bituminous conglomerates that have been recycled, that are new or mixtures thereof.
  • Plants for treating and producing bituminous conglomerates are penalised by known desiccators and by their technologies for introducing and desiccating the materials or conglomerates, in particular conglomerates recovered through milling (RAP) of road surfaces.
  • RAP milling
  • Desiccators of the prior art foresee a rotating cylinder, with a slightly tilted axis, in which the material to be treated is inserted. Inside the cylinder there is a flame heater and the heated product rolls in counter-current with respect to the direction of the flame up to an outlet of the desiccator. Usually, the inert material is inserted into the cylinder on the side opposite the heater and the RAP product is inserted through a suitable recycling ring in a central position with respect to the ends of the cylinder.
  • This technology has some problems concerning combustion emissions, the low percentage of RAP which can be inserted, the impossibility of reclassifying the mixture in outlet from the desiccator due to clogging, and the high percentage of residual humidity in the mixture at the outlet.
  • the insertion of product through the ring also causes cold air to be sucked in, reducing performance.
  • the insertion in the discharge chamber allows usage only with a low percentage of product which can be desiccated.
  • the mixture in outlet in any case, has a high percentage of residual humidity.
  • the normal values can be, for example, maximum percentages of RAP which can be desiccated of around 20% and residual humidity in the conglomerate of even 70%.
  • the general purpose of the present invention is to avoid the aforementioned drawbacks by providing a desiccator which makes it possible to cut down combustion emissions, to increase the percentage of RAP which can be inserted (when used), to reclassify the mixtures, to have an acceptable percentage of residual humidity for the preparation process of the bituminous conglomerate, and to reduce the costs and the need for maintenance.
  • a desiccator for inert material comprising an axially rotating desiccator cylinder, into which products to be treated are inserted, and with a heating burner, characterised in that the inlet for the insertion of the products to be treated is close to an end of the cylinder and near the opposed end there is an outlet of the treated products and a combustor formed by the burner and by a hollow coaxial cylindrical element into which the burner directs the flame.
  • figure 1 shows a desiccator plant, wholly indicated with reference numeral 10, comprising a desiccator cylinder 11, mounted with a tilted axis and rotating through rolling supports 12, 13 and a motorization 14, advantageously with spur gears.
  • a conveyor 15 inserts the material to be treated near the top end of the cylinder, through an insertion mouth 16.
  • both the product to be recycled as well as the new product for integrating with the product to be recycled are discharged into the cylinder.
  • controlled discharge means 17, 18 feed the selected quantity of new product (virgin inert material) and recycled product (RAP) onto the belt.
  • the inlet area of the desiccator cylinder thus receives both products and they mix together in this area while substantially not yet heated.
  • Pre-mixing can also be foreseen.
  • a stationary burner 19 which emits a flame into the cylinder in a direction axial to the cylinder and directed inside it.
  • a hollow and open cylindrical element 20 which is coaxial to the desiccator cylinder 11, into which the flame of the burner is axially directed.
  • the cylindrical element is made up of (or covered with) tiles made from refractory material.
  • the cylindrical element with the flame of the burner forms a combustion chamber 26 and the cylindrical element and burner assembly thus form a combustor unit that has proven to substantially increase the performance of the desiccator oven.
  • the distance between the burner and the cylindrical element is set (also depending on the size of the flame) so that a Venturi effect is generated in front of the burner which takes the fumes from the periphery of the cylinder back towards the inside of the flame and inside the cylindrical element. This contributes to a reduction of pollutants.
  • the products to be treated are introduced from the coldest area of the cylinder and gradually come closer to the hottest area before being evacuated from a discharge outlet 21 in the lower areas of the desiccator cylinder.
  • the desiccator cylinder is equipped, on the inner wall, with members for stirring and circulating the treated products.
  • Such members are differentiated according to the area of the cylinder along the axis. The temperature of the areas will also increase from one end of the cylinder to the other, thanks to the burner coming closer.
  • the RAP and the virgin inert material are mixed together well through an inner surface of the cylinder which is equipped with advantageously helicoidally arranged blades.
  • the temperature in the cylinder has been found to be able to be advantageously around 120°C.
  • the mentioned temperatures for the various areas are average temperatures of the area, with the temperature gradient gradually increasing moving along the axis of the cylinder. Moreover, the temperature of the moving product will obviously be lower.
  • the temperature increase undergone by the mixture makes it possible for the humidity contained in the RAP (greater than that contained in the virgin inert materials) to be evaporated.
  • the inner surface of the cylinder is advantageously equipped with cups, blades or buckets extending along generatrices of the cylinder.
  • a third area 24 (temperature advantageously of around 300°C) is also equipped with cups, blades or buckets (advantageously bigger than those of the previous area) extending along generatrices of the cylinder.
  • the mixture is amalgamated; the particles of virgin inert materials bond with the particles of RAP thanks to the softening of the bitumen creating a conglomerate having characteristics similar to those of the virgin inert material, without the problems of clogging and sticking to the parts of the plant of the RAP itself in known plants.
  • Such a last area comprises an inner surface of the desiccator cylinder which is again equipped with helicoidally arranged blades, whereas on the surface of the cylinder around the cylindrical element 20 there are buckets 27.
  • the cylindrical element is supported at the cylinder through radial supports 28.
  • a double function is obtained consisting of the function of a combustion chamber, in the case in which the oven desiccates only the virgin inert material, and the function of a post-combustor, in the case in which the treated material contains RAP.
  • the percentage of residual humidity in the mixture is of around 5%.
  • the particular inner geometry of the oven ensures that the material in transit is lifted and stirred in an optimal way without being directly hit by the flame of the burner.
  • the bitumen softening step creates a gas which goes by the name of "blue smog".
  • This gas potentially pollutant, is burnt inside the combustor cylinder.
  • the "blue smog" created by the RAP and which advances in the lower part of the desiccator cylinder, is forcedly sucked inside the combustor thanks to the Venturi effect that the burner creates (also helped by its own fan) between the outlet of the burner and the inlet of the combustor cylinder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Drying Of Solid Materials (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
EP09179837A 2008-12-23 2009-12-18 Trockner für inertes Material Withdrawn EP2202473A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI2008A002312A IT1392402B1 (it) 2008-12-23 2008-12-23 Essiccatore per inerti

Publications (1)

Publication Number Publication Date
EP2202473A1 true EP2202473A1 (de) 2010-06-30

Family

ID=40852461

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09179837A Withdrawn EP2202473A1 (de) 2008-12-23 2009-12-18 Trockner für inertes Material

Country Status (2)

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EP (1) EP2202473A1 (de)
IT (1) IT1392402B1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBO20110307A1 (it) * 2011-05-27 2012-11-28 Ghirardelli Stefano Essiccatore per un impianto di realizzazione di conglomerati bituminosi.
ITMI20111352A1 (it) * 2011-07-20 2013-01-21 Bernardi Impianti Internationl S P A Essiccatoio a cilindro rotante per miscele di inerti vergini e materiali di recupero per la preparazione di conglomerati bituminosi
ITMI20111354A1 (it) * 2011-07-20 2013-01-21 Bernardi Impianti Internat S P A Essiccatoio a cilindro rotante per miscele di inerti vergini e materiali di recupero per la preparazione di conglomerati bituminosi
ITMI20111353A1 (it) * 2011-07-20 2013-01-21 Bernardi Impianti Internat S P A Essiccatoio a cilindro rotante per miscele di inerti vergini e materiali di recupero per la preparazione di conglomerati bituminosi
WO2019111073A1 (en) * 2017-12-04 2019-06-13 Bernardi Impianti S.R.L. Gasification apparatus
EP4246071A1 (de) * 2022-03-16 2023-09-20 Benninghoven Zweigniederlassung der Wirtgen Mineral Technologies GmbH Flammschutz-vorrichtung und trockentrommel mit einer derartigen flammschutz-vorrichtung
CN116876296A (zh) * 2023-07-13 2023-10-13 江苏海洋大学 一种富油rap精分细粉料加热计量除湿投放装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106091626A (zh) * 2016-07-20 2016-11-09 马先芝 一种可检测湿度的矿渣烘干机

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE306506C (de) *
DE72883C (de) * H. KEFERSTEIN in Braunschweig Trockentrommel
US1715852A (en) * 1926-10-11 1929-06-04 Madsen Iron Works Material drier
US1876025A (en) * 1929-12-03 1932-09-06 Webster I Sallee Drying apparatus and process
US2503686A (en) * 1946-06-05 1950-04-11 Overmander Machine Inc Aggregate drier
US2512903A (en) * 1946-12-07 1950-06-27 Schwietert Gustav Drying apparatus
GB719719A (en) * 1951-12-20 1954-12-08 Jens Arthur Rondan Improvements in or relating to the drying of granular or pulverulent materials
US3614071A (en) * 1970-05-25 1971-10-19 Cmi Corp Asphalt plant dryer-mixer
US4229109A (en) * 1978-04-24 1980-10-21 Boeing Construction Equipment Company System for producing bituminous paving mixtures
US4255058A (en) * 1979-06-20 1981-03-10 Wibau Industrie Und Verwaltung Gmbh Apparatus for preparing bituminous mixtures, especially road construction mixtures
DE3939734A1 (de) * 1989-12-01 1991-06-06 Karl Martin Dipl Ing Stahl Heizmischfoerderer in trommelbauart fuer asphalt-recycling, baustoffe oder dergleichen
WO1993010952A1 (en) * 1991-11-27 1993-06-10 Cyclean, Inc. Method and apparatus for producing hot mix asphalt
DE4243264A1 (de) * 1992-12-19 1994-06-23 Deutag Ag Drehofen zum Trocknen und/oder Mischen von rieselfähigem Material
US5658094A (en) * 1996-01-05 1997-08-19 Cedarapids, Inc Energy recuperative soil remediation system
US6267493B1 (en) * 1999-06-02 2001-07-31 Cmi Corporation Drum mixer having a plurality of isolated aggregate transport channels
US6860735B1 (en) * 2000-09-21 2005-03-01 S. Mac Co., Ltd. Rotary kiln

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE306506C (de) *
DE72883C (de) * H. KEFERSTEIN in Braunschweig Trockentrommel
US1715852A (en) * 1926-10-11 1929-06-04 Madsen Iron Works Material drier
US1876025A (en) * 1929-12-03 1932-09-06 Webster I Sallee Drying apparatus and process
US2503686A (en) * 1946-06-05 1950-04-11 Overmander Machine Inc Aggregate drier
US2512903A (en) * 1946-12-07 1950-06-27 Schwietert Gustav Drying apparatus
GB719719A (en) * 1951-12-20 1954-12-08 Jens Arthur Rondan Improvements in or relating to the drying of granular or pulverulent materials
US3614071A (en) * 1970-05-25 1971-10-19 Cmi Corp Asphalt plant dryer-mixer
US4229109A (en) * 1978-04-24 1980-10-21 Boeing Construction Equipment Company System for producing bituminous paving mixtures
US4255058A (en) * 1979-06-20 1981-03-10 Wibau Industrie Und Verwaltung Gmbh Apparatus for preparing bituminous mixtures, especially road construction mixtures
DE3939734A1 (de) * 1989-12-01 1991-06-06 Karl Martin Dipl Ing Stahl Heizmischfoerderer in trommelbauart fuer asphalt-recycling, baustoffe oder dergleichen
WO1993010952A1 (en) * 1991-11-27 1993-06-10 Cyclean, Inc. Method and apparatus for producing hot mix asphalt
DE4243264A1 (de) * 1992-12-19 1994-06-23 Deutag Ag Drehofen zum Trocknen und/oder Mischen von rieselfähigem Material
US5658094A (en) * 1996-01-05 1997-08-19 Cedarapids, Inc Energy recuperative soil remediation system
US6267493B1 (en) * 1999-06-02 2001-07-31 Cmi Corporation Drum mixer having a plurality of isolated aggregate transport channels
US6860735B1 (en) * 2000-09-21 2005-03-01 S. Mac Co., Ltd. Rotary kiln

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBO20110307A1 (it) * 2011-05-27 2012-11-28 Ghirardelli Stefano Essiccatore per un impianto di realizzazione di conglomerati bituminosi.
ITMI20111352A1 (it) * 2011-07-20 2013-01-21 Bernardi Impianti Internationl S P A Essiccatoio a cilindro rotante per miscele di inerti vergini e materiali di recupero per la preparazione di conglomerati bituminosi
ITMI20111354A1 (it) * 2011-07-20 2013-01-21 Bernardi Impianti Internat S P A Essiccatoio a cilindro rotante per miscele di inerti vergini e materiali di recupero per la preparazione di conglomerati bituminosi
ITMI20111353A1 (it) * 2011-07-20 2013-01-21 Bernardi Impianti Internat S P A Essiccatoio a cilindro rotante per miscele di inerti vergini e materiali di recupero per la preparazione di conglomerati bituminosi
EP2549017A1 (de) 2011-07-20 2013-01-23 Bernardi Impianti International S.P.A. Drehzylindertrockner für Mischungen aus primären Inertmaterialien und Rückgewinnungsmaterialien zur Herstellung von Bitumenzusammensetzungen
EP2549016A1 (de) 2011-07-20 2013-01-23 Bernardi Impianti International S.P.A. Drehzylindertrockner für Mischungen aus primären Inertmaterialien und Rückgewinnungsmaterialien zur Herstellung von Bitumenzusammensetzungen
WO2019111073A1 (en) * 2017-12-04 2019-06-13 Bernardi Impianti S.R.L. Gasification apparatus
EP4246071A1 (de) * 2022-03-16 2023-09-20 Benninghoven Zweigniederlassung der Wirtgen Mineral Technologies GmbH Flammschutz-vorrichtung und trockentrommel mit einer derartigen flammschutz-vorrichtung
CN116876296A (zh) * 2023-07-13 2023-10-13 江苏海洋大学 一种富油rap精分细粉料加热计量除湿投放装置

Also Published As

Publication number Publication date
IT1392402B1 (it) 2012-03-02
ITMI20082312A1 (it) 2010-06-24

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