EP0146939A2 - Dispositif et procédé de chauffage d'asphalte concassé - Google Patents

Dispositif et procédé de chauffage d'asphalte concassé Download PDF

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Publication number
EP0146939A2
EP0146939A2 EP84115988A EP84115988A EP0146939A2 EP 0146939 A2 EP0146939 A2 EP 0146939A2 EP 84115988 A EP84115988 A EP 84115988A EP 84115988 A EP84115988 A EP 84115988A EP 0146939 A2 EP0146939 A2 EP 0146939A2
Authority
EP
European Patent Office
Prior art keywords
asphalt
housing
heating
channel
infrared radiators
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Withdrawn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
EP84115988A
Other languages
German (de)
English (en)
Other versions
EP0146939A3 (fr
Inventor
Felix Dr. Ing. Huster
Hermann Märtens
Franz Dipl. Ing. Rode
Guntram Dr. Ing. Kohler
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.)
Deutag Mischwerke GmbH
Original Assignee
Deutag Mischwerke GmbH
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 Deutag Mischwerke GmbH filed Critical Deutag Mischwerke GmbH
Publication of EP0146939A2 publication Critical patent/EP0146939A2/fr
Publication of EP0146939A3 publication Critical patent/EP0146939A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/104—Mixing by means of movable members in a non-rotating mixing enclosure, e.g. stirrers

Definitions

  • the invention relates to a device for heating crushed asphalt, with at least one mixing device rotating in a housing and at least one heating device provided on the housing, and a corresponding method.
  • old asphalt In road construction, old asphalt is being used to an increasing extent, which is obtained from old road surfaces to be converted or expanded and, together with unused bitumen and / or with minerals, becomes one for new road surfaces and the like.
  • usable asphalt mass is mixed.
  • Such covering masses can contain more than 25% by weight of old asphalt.
  • thermal pretreatment of the old asphalt is necessary.
  • the asphalt has been heated by introducing steam or warm air into the Old asphalt mass or by circulating the asphalt mass in a heated drying drum. In both cases, the energy requirement is considerable.
  • a drying drum there is also the risk that the old asphalt comes into contact with the open flame heating the drying drum and burns the betumen mass contained in it.
  • the invention has for its object to design a device and a method of the type mentioned in such a way that gentle heating of the old asphalt takes place with little energy.
  • the heating device consists of several infrared radiators which are directed towards the asphalt material circulated by the screw conveyor.
  • the free-flowing asphalt is constantly circulated by the screw conveyor and kept in motion prevents parts or individual grains from being exposed to excessive local heat radiation.
  • the heat is distributed evenly and gently over the free-flowing granular material, which is transported by the screw conveyor and constantly mixed again.
  • the temperature increases continuously, however, the material remains until leaving the F OER Dersch corner flowing, so that the feed screw does not become clogged and the process of constant recirculation until they leave the conveyor path is maintained.
  • Infrared heaters have the advantage of high efficiency.
  • a high proportion of the energy supplied to the infrared radiators is aimed specifically at the asphalt, with the constant circulation achieving a uniform temperature distribution in the asphalt granulate and local overheating being avoided.
  • the interaction of the infrared radiators with a screw conveyor, which carries out stirring and conveying processes at the same time, leads to particularly favorable results.
  • the infrared emitters are arranged in a channel of the housing which runs above the screw conveyor and is essentially open at the bottom.
  • the housing is provided with a thermal insulation layer in order to keep the heat losses low.
  • the infrared heaters primarily heat the asphalt material, which in turn heats up the surrounding air. A significant amount of heat is thus supplied to the asphalt by heat radiation and only a relatively small amount by convection. This contributes to gentle and even heating with relatively little energy consumption.
  • air passage openings are arranged between the infrared radiators and the duct is connected to a warm air outlet.
  • the air that comes into contact with the asphalt and warms up is discharged through the air outlet openings and the warm air outlet.
  • the energy contained in this warm air can on the system be fed in another way.
  • the warm air discharge prevents the system from heating up to an excessively high temperature at which the asphalt is thermally damaged, segregated and at which important components evaporate and / or burn.
  • gas components that escape from the asphalt mass are removed.
  • the warm air outlet is preferably arranged above the outlet-side end of the screw conveyor, because the highest air temperature is set there.
  • the housing can be heated with a second heating device made of pipes in which a heat transfer medium flows. These pipes heat the housing walls, which in turn transfer the heat to the old asphalt.
  • This relatively slow second heating system can be used as basic heating or preheating. Since the asphalt particles only come into temporary contact with the housing and, on the other hand, the temperature of the housing is lower than the intended final temperature that the asphalt is to have when leaving the housing, no harmful thermal effects can be caused by the second heating device.
  • the method according to the invention is characterized in that the asphalt is fed into a conveying channel, which contains at least one screw conveyor, in a free-flowing state and in an amount such that it fills the conveying channel only in the lower region of the conveying channel cross section, and during the passage through the conveying channel irradiation with infrared rays takes place from above.
  • the only partial filling of the conveyor channel with asphalt ensures that the individual asphalt particles are constantly rearranged.
  • the heating device 16 which is shown in FIG. 2, has an elongated housing 21, in which two screw conveyors 22, of which only one is visible in FIG. 2, are arranged parallel to one another.
  • Each screw conveyor 22 runs in an approximately semi-cylindrical conveyor channel 23 and is driven by a motor 24 attached to the housing 21 on the feed side.
  • the screw conveyors rotate in opposite directions and their screw flights run in opposite directions, so that they convey in the same direction.
  • the housing 21 has a longitudinal channel 25, in which numerous infrared radiators 26 are arranged one behind the other in the longitudinal direction at mutual distances.
  • the infrared radiators 26 can be fed, for example, with electrical current, with gas or with heating oil.
  • Gas-powered infrared emitters will preferably be used.
  • the infrared emitters 26 have radiation surfaces directed downwards, so that the heat radiation emitted by them is directed onto the asphalt mass located in the conveying channels 23.
  • the weighing and dosing device 15 controls the conveyor 14 so that it only fills the comminuted old asphalt into the conveying channels 23 in such an amount that the conveying channels are only partially filled.
  • the temperature is controlled or regulated so that the asphalt leaving the conveying channels 23 at the end of the conveying path through the outlet 27 has a temperature of approximately 150 ° below its melting temperature of approximately 160 °.
  • a warm air outlet 29 At the discharge-side end of the channel 25 there is a warm air outlet 29, to which a suction fan can be connected in order to extract the warm air.
  • Part of the warm air leaving the housing can be returned to the housing via return channels (not shown). It is also possible to cool the discharged warm air, which may contain other gases, in a heat exchanger and otherwise to supply the heat to the housing 21 again.
  • the housing 21 is surrounded by a tubular jacket through which thermal oil or another heating medium flows.
  • the tubular jacket which lies against the heat-conducting inner wall of the housing, is, like the entire housing 21, surrounded by a heat-insulating jacket 31.
  • Each infrared radiator 26 is provided at its end facing the warm air outlet 29 with a baffle plate 30 which directs the warm air rising through the air passage opening 28 in the direction of the warm air outlet 29.
  • the processing device for the old asphalt is stationary.
  • the device can also be designed to be mobile and can be provided with corresponding wheels.
  • Semi-mobile devices are also possible, which can be used at another location.
  • the device does not only have to be used asphalt for processing, but it can also with the addition of unused supplementary building materials such as minerals, binders, additives or the like. be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
EP84115988A 1983-12-29 1984-12-20 Dispositif et procédé de chauffage d'asphalte concassé Withdrawn EP0146939A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833347370 DE3347370C1 (de) 1983-12-29 1983-12-29 Vorrichtung zum Erhitzen von zerkleinertem Altasphalt
DE3347370 1983-12-29

Publications (2)

Publication Number Publication Date
EP0146939A2 true EP0146939A2 (fr) 1985-07-03
EP0146939A3 EP0146939A3 (fr) 1986-08-20

Family

ID=6218328

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84115988A Withdrawn EP0146939A3 (fr) 1983-12-29 1984-12-20 Dispositif et procédé de chauffage d'asphalte concassé

Country Status (4)

Country Link
EP (1) EP0146939A3 (fr)
DE (1) DE3347370C1 (fr)
DK (1) DK620284A (fr)
NO (1) NO845241L (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989003914A1 (fr) * 1987-10-22 1989-05-05 Karl Martin Stahl Convoyeur malaxeur a chaud pour fabrication en continu d'asphalte routier ou d'asphalte coule
WO1997016600A1 (fr) * 1995-11-02 1997-05-09 Amomatic Oy Procede et appareil de chauffage de matiere rocheuse
GB2325176A (en) * 1997-05-03 1998-11-18 Talbot Technology Limited Heating re-cycled asphalt with infra-red during the manufacture of hot mix asphlt
EP0985768A1 (fr) * 1998-09-07 2000-03-15 Talbot Technology Limited Rothamsted Research Station Procédé et appareil pour le recyclage d'asphalte
FR2866037A1 (fr) * 2004-02-09 2005-08-12 Emile Lopez Procede et dispositif de mise en temperature de granulats et/ou d'enrobes routiers, notamment d'enrobes usages a recycler
FR3091543A1 (fr) * 2019-01-08 2020-07-10 Colas Dispositif d’enrobage de granulats, son procédé de mise en œuvre et ses utilisations

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4110981A1 (de) * 1991-04-05 1992-10-08 Wibau Gmbh Verfahren zur herstellung von asphaltgemischen mit einer ueber den mischturm angeordneten trocken- und heiztrommel sowie ergaenzung des verfahrens fuer die teilaufgabe der abgaskuehlung und -waesche

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4136964A (en) * 1977-04-14 1979-01-30 Cmi Corporation Apparatus for simultaneously mixing and conveying particulate material
NL7708800A (en) * 1977-08-10 1979-02-13 Moel Wegenbouwmaatschappij B V Used asphalted concrete reworking system - heats in vessel and mixes with new asphalt
FR2441682A1 (fr) * 1978-11-17 1980-06-13 Creusot Loire Dispositif pour la preparation de produits enrobes bitumineux pour revetements routiers
US4418682A (en) * 1981-06-01 1983-12-06 Poweray Infrared Corporation Asphalt reclamation unit
GB2115711A (en) * 1982-01-27 1983-09-14 Ben Travis A highway asphalt and coated a recycling machine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989003914A1 (fr) * 1987-10-22 1989-05-05 Karl Martin Stahl Convoyeur malaxeur a chaud pour fabrication en continu d'asphalte routier ou d'asphalte coule
WO1997016600A1 (fr) * 1995-11-02 1997-05-09 Amomatic Oy Procede et appareil de chauffage de matiere rocheuse
GB2325176A (en) * 1997-05-03 1998-11-18 Talbot Technology Limited Heating re-cycled asphalt with infra-red during the manufacture of hot mix asphlt
EP0985768A1 (fr) * 1998-09-07 2000-03-15 Talbot Technology Limited Rothamsted Research Station Procédé et appareil pour le recyclage d'asphalte
FR2866037A1 (fr) * 2004-02-09 2005-08-12 Emile Lopez Procede et dispositif de mise en temperature de granulats et/ou d'enrobes routiers, notamment d'enrobes usages a recycler
WO2005075742A1 (fr) * 2004-02-09 2005-08-18 Emile Lopez Procede et dispositif de mise en temperature de granulats et/ou d'enrobes routiers, notamment d'enrobes usages a recycler
US9045867B2 (en) 2004-02-09 2015-06-02 Fenixfalt Method and device for heating worn road coating materials
FR3091543A1 (fr) * 2019-01-08 2020-07-10 Colas Dispositif d’enrobage de granulats, son procédé de mise en œuvre et ses utilisations
WO2020144432A1 (fr) 2019-01-08 2020-07-16 Colas Dispositif d'enrobage de granulats, procédé et utilisations

Also Published As

Publication number Publication date
EP0146939A3 (fr) 1986-08-20
DE3347370C1 (de) 1985-05-23
DK620284A (da) 1985-06-30
DK620284D0 (da) 1984-12-21
NO845241L (no) 1985-07-01

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Inventor name: KOHLER, GUNTRAM, DR. ING.

Inventor name: MAERTENS, HERMANN

Inventor name: RODE, FRANZ, DIPL. ING.

Inventor name: HUSTER, FELIX, DR. ING.