EP0183079B1 - Process and apparatus for preparing an asphaltic mixture with recycled old asphalt - Google Patents

Process and apparatus for preparing an asphaltic mixture with recycled old asphalt Download PDF

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Publication number
EP0183079B1
EP0183079B1 EP85113874A EP85113874A EP0183079B1 EP 0183079 B1 EP0183079 B1 EP 0183079B1 EP 85113874 A EP85113874 A EP 85113874A EP 85113874 A EP85113874 A EP 85113874A EP 0183079 B1 EP0183079 B1 EP 0183079B1
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EP
European Patent Office
Prior art keywords
drum
mixer
heated
burner
asphalt
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.)
Expired
Application number
EP85113874A
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German (de)
French (fr)
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EP0183079A1 (en
Inventor
Horst Brüggemann
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Deutsche Asphalt GmbH
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Deutsche Asphalt GmbH
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Application filed by Deutsche Asphalt GmbH filed Critical Deutsche Asphalt GmbH
Priority to AT85113874T priority Critical patent/ATE36017T1/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
    • E01C19/1004—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
    • E01C19/1027—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
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/105—Mixing or coating by a combination of methods covered by E01C19/1018 - E01C19/104, excluding E01C19/1036
    • 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
    • E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
    • E01C19/1063—Controlling the operations
    • 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 invention relates to a method according to the preamble of the main claim and an apparatus for performing the method.
  • the object of the invention is to provide a method and an apparatus for carrying out the method of the type mentioned, which avoid the aforementioned disadvantages and in particular ensure that the manufacturing and reprocessing process with respect to the mixing ratio between the old and new portion of the reprocessed
  • the material and heat balance as well as the length of stay of the material in the system can be regulated in an exactly adjustable manner.
  • the old asphalt portion and the new material portion of the asphalt mixture to be prepared or produced are processed in differently designed drum devices, that is to say in particular are heated, with old asphalt Portion in a drum mixer operated in cocurrent and the new material portion in a counter-current drying drum are heated separately, and then, after leaving the respective drum devices, passed into at least one further downstream mixer and further processed there, optionally in the mixer Fresh bitumen and filler material are added, and that the exhaust gases from the drum mixer are introduced directly into the drying drum and further heated there, thereby burning the CH x and CO components contained in the exhaust gases.
  • This method according to the invention primarily ensures an environmentally friendly preparation of asphalt mix with reuse of broken old asphalt, namely in that the part of the old asphalt which is sensitive to extreme heating is independent of the new material part in a separate drum device on the at least the maximum possible temperature is first heated.
  • the relatively low temperatures of the heating gases release carbon monoxide (CO), which then, after being transferred to the drum mixer, continues to heat up together with the heating gases that are generated or generated there, and is converted to carbon dioxide (COz) and only after that the environment is released.
  • CO carbon monoxide
  • the method described above does not require any special conveying and throwing devices within the two drum devices; rather, generally known conveying devices can be provided and conventional drum devices can be used.
  • the exhaust gases of the drum mixer are introduced into the interior of the drying drum via a feed device formed on the end wall of the drying drum containing the burner in the immediate vicinity of the burner flame.
  • the exhaust gases of the drum mixer are directed toward the burner flame depending on the respective size or extension, or are guided directly past it.
  • the burner flame is set, i.e. that is, the extent of the same can be different, both in terms of their length and also their extent (diameter). It is therefore essential that the direction of the exiting exhaust gas streams is aligned in relation to the size of the burner flame.
  • the exhaust gases from the drum mixer are advantageously guided around the burner flame in the form of an at least partial jacket flow.
  • the old asphalt part in the drum mixer is preferably heated up to approx. 170 ° C. and the new material part up to approx. 180 ° - 350 ° C.
  • the mixing ratio between the old asphalt portion and the new material portion in the asphalt mix is advantageously adjustable, the old asphalt portion preferably predominating to a considerable extent.
  • the asphalt mix in a certain mixing ratio of old asphalt and new material is further heated in the connected mixer and kept at the desired final temperature.
  • This additional heating ensures that the digestion process of the old asphalt portion is not hindered or broken down.
  • the asphalt mix is preferably processed further after passing through the first mixer into a second, connected mixer, as a result of which an even more intensive connection of the material fractions is obtained.
  • the invention has also set itself the task of creating a device for carrying out the method mentioned at the outset, it being possible in particular to use conventional components, in particular drum devices, mixers, etc.
  • This further object of the invention is achieved in that two parallel drum devices for separate processing, i. H. in particular heating, the old asphalt portion and the new material are provided, the drum device provided for the preparation of the old asphalt portion being a drum mixer operating in direct current and the drum device provided for the preparation of the new material portion
  • a counter-current drying drum is that the material discharge points of the two drum devices are connected to at least one downstream mixer and that the drum mixer and drying drum are connected to one another via an exhaust gas line which ends in the form of a feed channel on the end wall of the drying drum containing the burner and which via openings is connected to the interior of the drying drum.
  • the openings are designed as flow channels, in particular nozzles.
  • This shape of the openings ensures an even flow of exhaust gas.
  • the flow channels are advantageously arranged concentrically surrounding the burner opening, being adjustable in terms of their jet direction and with respect to the flame direction of the burner.
  • All existing flow channels are advantageously coupled to one another and controlled synchronously.
  • the nozzles are adjustable depending on the burner flame.
  • This design of the flow channels allows a controllably controllable introduction of the exhaust gases and thus optimal combustion of the same.
  • the first mixer is advantageously connected to a second mixer, which is designed in accordance with the first mixer and both are double-shaft forced and continuous mixers. This ensures a particularly intensive mixing of the asphalt mix components.
  • the mixers are advantageously designed to be heatable, as a result of which an exact setting of the asphalt mixture to the desired final temperature is possible.
  • the mixers also contain addition devices for fresh bitumen and filler material.
  • the device proposed for carrying out the method according to the invention essentially consists of a drum mixer 1 operated in cocurrent, a drying drum 2 operated in countercurrent, and two mixers 3 and 4 arranged downstream of the drum mixer 1 and the drying drum 2.
  • the asphalt mix M G to be processed was mainly composed of an old asphalt portion M A and a new material portion M N with the addition of bitumen B and filler material F.
  • the old asphalt portion M A is drawn off from a storage device 5 via a belt weigher 6 and introduced into the drum mixer 1, whereby it is passed through the interior space of the drum mixer heated by the burner 7.
  • the interior of the drum mixer 1 is equipped with conventional conveying devices 9, indicated in cross section 8.
  • the drum mixer 1 is provided at its end opposite the burner 7 with a schematically indicated exhaust gas line 10 and connected to the drying drum 2 via this.
  • the special design of the exhaust gas Line 10 on the end wall of the drying drum 2 containing the burner 13 is described below.
  • the new material fraction M N to be processed therein is introduced via a belt weigher 11 from a storage device 12 on the end wall opposite the burner 13 and is transported and heated via conveyor devices 15, also indicated schematically in a cross section 14.
  • the drying drum 2 has at its end opposite the burner 13 an exhaust pipe 16 which is connected to a filter dedusting system 17.
  • the exhaust gases are released from this filter dedusting system into the environment by means of a ventilation device 18.
  • the asphalt mix fractions M A and -M N heated in the drum mixer 1 and the drying drum 2 are taken up by a first mixer 3, which, as shown schematically in section 19, is designed as a double-shaft forced and continuous mixer.
  • this mixer 3 is designed to be heatable, for example in the form of a double-walled trough, in the wall space between which a heating medium can flow.
  • the mixer 3 is followed by a structurally corresponding second mixer 4.
  • Swiveling flow channels 28 designed as nozzles are used in the openings, which can introduce the jet of exhaust gases emerging from them into the interior 27 of the drying drum 2 in freely selectable directions.
  • These pivotable nozzles 28 are controlled via tie rods 29 and an adjusting ring 30 and actuating cylinders 31, all of the nozzles 28 being connected to one another via this actuating system and being able to be synchronously controlled coupled to one another.
  • the angular position of the nozzles 28 can be adjusted depending on the size and extent of the burner flame 32.
  • the above-described formation of the openings 26 in the end wall 23 of the drying drum 2 makes it possible to steer the respective jet of the individual nozzles in such a way that, depending on the extension of the burner flame 32, the exhaust gas to be blown in is not blown directly into the burner flame 32, but at a certain distance is guided past this. This ensures in particular that there is always complete combustion of the fuel of the burner within the burner flame 10 and at the same time the introduced exhaust gas is optimally burned out.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Road Paving Structures (AREA)
  • Working-Up Tar And Pitch (AREA)

Abstract

PCT No. PCT/DE85/00433 Sec. 371 Date Jul. 11, 1986 Sec. 102(e) Date Jul. 11, 1986 PCT Filed Oct. 31, 1985 PCT Pub. No. WO86/02962 PCT Pub. Date May 22, 1986.A method as well as an apparatus for processing asphalt mixtures is provided in which broken-up used asphalt is employed and new material is added, utilizing a plurality of burner-heated drum devices, with the used asphalt component and the new material for the asphalt mixture to be processed or produced being processed, i.e. heated in particular, in respectively differently configured drum devices. The used asphalt component is heated separately in a drum mixer operated with parallel flow and the new material component is heated in a drying drum operated with counterflow. After leaving their respective drum devices, the components are conducted into at least one further connected mixer and are further treated there with fresh bitumen and possibly with filler material being added in the mixer. Furthermore, the exhaust gases of the drum mixer are introduced directly into the drying drum and are further heated there, thus combusting the CHx and CO component contained therein. In this process, the exhaust gases of the drum mixer are introduced into the interior of the drying drum in the immediate vicinity of the burner flame through flow channels in the form of nozzles via a feed device formed at the frontal face of the drying drum in which the burner is disposed, with the direction of the nozzles being adjustable as a function of the size of the burner flame.

Description

Die Erfindung betrifft ein Verfahren gemäß Oberbegriff des Hauptanspruches sowie eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method according to the preamble of the main claim and an apparatus for performing the method.

Bei solchen bekannten Verfahren zur Wiederaufbereitung von Alt-Asphalt ist zu unterscheiden, ob solche Aufbereitungsanlagen mit einer in Gegenstrom betriebenen Trockentrommel bzw. einem im Gleichstrom betriebenen Trommelmischer arbeiten. Im Gegenstrom betriebene Trockentrommeln weisen einen gegenüber dem Gleichstrom-Verfahren günstigeren Wirkungsgrad hinsichtlich des Wärmeaustausches zwischen Flamme und zu erhitzendem Material auf, andererseits ergeben sich aber Schwierigkeiten bezüglich Aufbereitung des aufgebrochenen Alt-Asphalt-Materials.In such known methods for the reprocessing of old asphalt, a distinction must be made as to whether such processing plants work with a drying drum operated in countercurrent or a drum mixer operated in cocurrent. Counter-current dry drums are more efficient than the direct current method in terms of heat exchange between the flame and the material to be heated, but on the other hand there are difficulties with the processing of the broken up old asphalt material.

Hierbei entweichen aus dem Bitumen desselben Kohlenwasserstoffe (CHx) und durch leichten Schwel-brand entstehen erhebliche Mengen Kohlenmonoxyd (CO), welche beide trotz umfangreicher Filtervorrichtungen mit dem Abgas ins Freie gelangen und erheblich belästigend auf die Umwelt einwirken. Die gesetzlich vorgeschriebenen Mindest-Mengen der Emissionen werden in der Regel weit überschritten.In this process, hydrocarbons (CH x ) escape from the bitumen and a slight smoldering fire produces considerable amounts of carbon monoxide (CO), both of which escape into the open air with the exhaust gas despite extensive filtering devices and have a significant nuisance on the environment. The legally prescribed minimum quantities of emissions are generally far exceeded.

Aufgabe der Erfindung ist es, ein Verfahren und eine Vorrichtung zur Durchführung des Verfahrens der eingangs genannten Art zu schaffen, welche die vorerwähnten Nachteile vermeiden und insbesondere gewährleisten, daß der Herstellungs- und Wiederaufbereitungs-Prozeß bezüglich Mischungsverhältnis zwischen Alt- und Neu-Anteil des aufzubereitenden Materials und Wärmebilanz sowie Verweildauer des Materials in der Anlage genauestens einstellbar regelbar ist.The object of the invention is to provide a method and an apparatus for carrying out the method of the type mentioned, which avoid the aforementioned disadvantages and in particular ensure that the manufacturing and reprocessing process with respect to the mixing ratio between the old and new portion of the reprocessed The material and heat balance as well as the length of stay of the material in the system can be regulated in an exactly adjustable manner.

Diese Aufgabe wird dadurch gelöst, daß bei einem Verfahren der eingangs genannten Art Alt-Asphalt-Anteil und Neu-Material-Anteil des aufzubereitenden bzw. herzustellenden Asphaltmischgutes in jeweils unterschiedlich ausgebildeten Trommel-Vorrichtungen aufbereitet, d. h. insbesondere erhitzt werden, wobei Alt-Asphalt-Anteil in einem im Gleichstrom betriebenen Trommelmischer und der Neu-Material-Anteil in einer im Gegenstrom betriebenen Trockentrommel getrennt erhitzt werden, und anschließend nach Verlassen der jeweiligen Trommel-Vorrichtungen in mindestens einen weiteren nachgeschalteten Mischer geleitet und dort weiterbehandelt werden, wobei in den Mischer gegebenenfalls Frisch-Bitumen und Füller-Material zugegeben werden, und daß die Abgase des Trommelmischers unmittelbar in die Trockentrommel eingeleitet und dort weiter erhitzt und dadurch die in den Abgasen enthaltenen CHx- und CO-Anteile verbrannt werden.This object is achieved in that, in a method of the type mentioned at the outset, the old asphalt portion and the new material portion of the asphalt mixture to be prepared or produced are processed in differently designed drum devices, that is to say in particular are heated, with old asphalt Portion in a drum mixer operated in cocurrent and the new material portion in a counter-current drying drum are heated separately, and then, after leaving the respective drum devices, passed into at least one further downstream mixer and further processed there, optionally in the mixer Fresh bitumen and filler material are added, and that the exhaust gases from the drum mixer are introduced directly into the drying drum and further heated there, thereby burning the CH x and CO components contained in the exhaust gases.

Dieses erfindungsgemäße Verfahren gewährleistet in erster Linie eine umweltfreundliche Aufbereitung von Asphaltmischgut unter Wiederverwendung aufgebrochenen Alt-Asphalt, nämlich dadurch, daß der gegen extreme Erhitzung empfindliche Alt-Asphalt-Anteil unabhängig von dem Neu-Material-Anteil in einer separaten Trommel-Vorrichtung auf die zumindest zunächst maximal mögliche Temperatur erhitzt wird. Bei diesem Erhitzungsvorgang des Alt-Asphalts wird durch die verhältnismäßig niedrigen Temperaturen der Heizgase Kohlenmonoxyd (CO) frei, welches dann nach Überleitung in den Trommelmischer zusammen mit den dort entstehenden bzw. entstandenen Heizgasen weiter erhitzt und zu Kohlendioxyd (COz) umgewandelt und erst danach an die Umwelt abgegeben wird.This method according to the invention primarily ensures an environmentally friendly preparation of asphalt mix with reuse of broken old asphalt, namely in that the part of the old asphalt which is sensitive to extreme heating is independent of the new material part in a separate drum device on the at least the maximum possible temperature is first heated. During this heating process of the old asphalt, the relatively low temperatures of the heating gases release carbon monoxide (CO), which then, after being transferred to the drum mixer, continues to heat up together with the heating gases that are generated or generated there, and is converted to carbon dioxide (COz) and only after that the environment is released.

Darüber hinaus bedarf das vorstehend beschriebene Verfahren keiner besonderen Förder-und Wurf-Einrichtungen innerhalb der beiden Trommel-Vorrichtungen, vielmehr können allgemein bekannte Förder-Vorrichtungen vorgesehen sein und gebräuchliche Trommel-Vorrichtungen verwendet werden.In addition, the method described above does not require any special conveying and throwing devices within the two drum devices; rather, generally known conveying devices can be provided and conventional drum devices can be used.

Gemäß einer vorteilhaften Ausgestaltung der Erfindung werden die Abgase des Trommelmischers über eine an der den Brenner enthaltenden Stirnwand der Trockentrommel ausgebildete Zuführungs-Vorrichtung in unmittelbarer Nähe der Brennerflamme in den Innenraum der Trockentrommel eingeleitet.According to an advantageous embodiment of the invention, the exhaust gases of the drum mixer are introduced into the interior of the drying drum via a feed device formed on the end wall of the drying drum containing the burner in the immediate vicinity of the burner flame.

Diese Form der Einführung der Abgase in den Innenraum der Trockentrommel gewährleistet, daß ein inniger Kontakt zur Brennerflamme hergestellt und dadurch die Weiterverbrennung der nicht ausgebrannten Abgase aus dem Trommelmischer erfolgt.This form of introduction of the exhaust gases into the interior of the drying drum ensures that intimate contact is made with the burner flame and the unburned exhaust gases from the drum mixer are thus further burned.

In weiterer vorteilhafter Ausbildung werden die Abgase des Trommelmischers in Abhängigkeit von der jeweiligen Größe bzw. Ausdehnung der Brennerflamme gezielt an diese herangelenkt bzw. an dieser unmittelbar vorbeigeführt.In a further advantageous embodiment, the exhaust gases of the drum mixer are directed toward the burner flame depending on the respective size or extension, or are guided directly past it.

Je nach Hitzebedarf wird die Brennerflamme eingestellt, d. h., die Ausdehnung derselben kann unterschiedlich sein, und zwar bezüglich ihrer Länge wie auch ihrer Ausdehnung (Durchmesser). Es ist deshalb wesentlich, daß die Richtung der austretenden Abgasströme entsprechend der jeweiligen Größe der Brennerflamme in bezug auf diese ausgerichtet wird.Depending on the heat requirement, the burner flame is set, i.e. that is, the extent of the same can be different, both in terms of their length and also their extent (diameter). It is therefore essential that the direction of the exiting exhaust gas streams is aligned in relation to the size of the burner flame.

Vorteilhaft sind die Abgase des Trommelmischers in Form eines mindestens teilweisen Mantelstromes um die Brennerflamme geführt.The exhaust gases from the drum mixer are advantageously guided around the burner flame in the form of an at least partial jacket flow.

In vorteilhafter Weiterbildung wird der Alt-Asphalt-Anteil im Trommelmischser vorzugsweise bis auf ca. 170 °C und der Neu-Material-Anteil bis auf ca. 180° - 350 °C aufgeheizt.In an advantageous further development, the old asphalt part in the drum mixer is preferably heated up to approx. 170 ° C. and the new material part up to approx. 180 ° - 350 ° C.

Diese Werte stellen annähernd Grenzwerte dar, welche ein umweltfreundliches und wärmebilanzmäßig wirtschaftliches Erhitzen der entsprechenden Materialien gewährleisten.These values are roughly limit values that ensure environmentally friendly and economically efficient heating of the corresponding materials.

Vorteilhaft ist das Mischungsverhältnis zwischen Alt-Asphalt-Anteil und Neu-Material-Anteil im Asphaltmischgut einstellbar regelbar, wobei vorzugsweise der Alt-Asphalt-Anteil in erheblichem Maße überwiegt.The mixing ratio between the old asphalt portion and the new material portion in the asphalt mix is advantageously adjustable, the old asphalt portion preferably predominating to a considerable extent.

Die vorstehend erläuterten Temperatur-und Mischungsverhältnis-Einstellungen gewährleisten, daß die in dem den beiden Trommel-Vorrichtungen angeschlossenen Mischer durchgeführte innige Vermengung der beiden Asphaltmischgut-Anteile optimal erfolgt, d. h., daß insbesondere der Alt-Asphalt-Anteil noch weiter aufgeschlossen wird.The temperature and mixing ratio settings explained above ensure that the intimate mixing of the two asphalt mix components carried out in the mixer connected to the two drum devices takes place optimally, ie that in particular the old asphalt component is further broken down.

Vorteilhaft wird das in einem bestimmten Mischungsverhältnis aus Alt-Asphalt-Anteil und Neu-Material-Anteil zusammengesetzte Asphaltmischgut in den angeschlossenen Mischer weiterhin beheizt und auf der gewünschten Endtemperatur gehalten.Advantageously, the asphalt mix in a certain mixing ratio of old asphalt and new material is further heated in the connected mixer and kept at the desired final temperature.

Diese zusätzliche Beheizung gewährleistet, daß der Aufschlußprozeß des Alt-Asphalt-Anteils nicht behindert bzw. abgebaut wird.This additional heating ensures that the digestion process of the old asphalt portion is not hindered or broken down.

Vorzugsweise wird das Asphaltmischgut nach Durchlaufen des ersten Mischers in einen zweiten, angeschlossenen Mischer weiterhin bearbeitet, wodurch eine noch intensivere Verbindung der Material-Anteile erhalten wird.The asphalt mix is preferably processed further after passing through the first mixer into a second, connected mixer, as a result of which an even more intensive connection of the material fractions is obtained.

Die Erfindung hat sich weiterhin die Aufgabe gestellt, eine Vorrichtung zur Durchführung des eingangs erwähnten Verfahrens zu schaffen, wobei insbesondere herkömmliche Bauteile, insbesondere Trommel-Vorrichtungen, Mischer etc., verwendet werden können.The invention has also set itself the task of creating a device for carrying out the method mentioned at the outset, it being possible in particular to use conventional components, in particular drum devices, mixers, etc.

Diese weitere Aufgabe der Erfindung wird dadurch gelöst, daß zwei parallel arbeitende Trommel-Vorrichtungen für die getrennte Aufbereitung, d. h. insbesondere Erhitzung, des Alt-Asphalt-Anteiles und des Neu-Materiales vorgesehen sind, wobei die für die Aufbereitung des Alt-Asphalt-Anteiles vorgesehene Trommelvorrichtung ein im Gleichstrom arbeitender Trommelmischer und die für die Aufbereitung des Neu- Material-Anteiles vorgesehene Trommel-Vorrichtung eine im Gegenstrom arbeitende Trockentrommel ist, daß die Materialabgabestellen der beiden Trommel-Vorrichtungen mit mindestens einem nachgeordneten Mischer und daß Trommelmischer und Trockentrommel über eine Abgasleitung miteinander verbunden sind, welche in Form eines Zuführungskanals an der den Brenner enthaltenden Stirnwand der Trockentrommel endet und welcher über Öffnungen mit dem Innenraum der Trockentrommel verbunden ist.This further object of the invention is achieved in that two parallel drum devices for separate processing, i. H. in particular heating, the old asphalt portion and the new material are provided, the drum device provided for the preparation of the old asphalt portion being a drum mixer operating in direct current and the drum device provided for the preparation of the new material portion A counter-current drying drum is that the material discharge points of the two drum devices are connected to at least one downstream mixer and that the drum mixer and drying drum are connected to one another via an exhaust gas line which ends in the form of a feed channel on the end wall of the drying drum containing the burner and which via openings is connected to the interior of the drying drum.

Diese Ausbildung der Vorrichtung erlaubt eine genaue Einstellung der Temperaturen in den beiden getrennten Trommel-Vorrichtungen zur materialgerechten Behandlung der beiden unterschiedlichen Asphaltmischgut-Anteile sowie eine genaue Einstellung des Mischungsverhältnisses vor Eingabe in den angeschlossenen Mischer und eine vollständige Verbrennung der nicht ausgebrannten Abgase aus dem Trommelmischer. In vorteilhafter Ausbildung sind die Öffnungen als Strömungskanäle, insbesondere Düsen ausgebildet.This design of the device allows a precise setting of the temperatures in the two separate drum devices for the material-appropriate treatment of the two different asphalt mix components, as well as a precise setting of the mixing ratio before input into the connected mixer and a complete combustion of the unburned exhaust gases from the drum mixer. In an advantageous embodiment, the openings are designed as flow channels, in particular nozzles.

Diese Form der Öffnungen gewährleistet einen gleichmäßig geführten Abgasstrom.This shape of the openings ensures an even flow of exhaust gas.

Vorteilhaft sind die Strömungskanäle die Brenneröffnung konzentrisch umgebend angeordnet, wobei sie bezüglich ihrer Strahlrichtung und bezogen auf die Flammenrichtung des Brenners verstellbar ausgebildet sind.The flow channels are advantageously arranged concentrically surrounding the burner opening, being adjustable in terms of their jet direction and with respect to the flame direction of the burner.

Hierdurch wird erreicht, daß die Abgas-Strömung jeweils entsprechend dem Durchmesser der Brennerflamme in jeweils optimalem Abstand zu derselben geführt werden könne.This ensures that the exhaust gas flow can be guided at an optimum distance from the burner flame, depending on the diameter of the burner flame.

Vorteilhaft sind sämtliche vorhandenen Strömungskanäle miteinander gekoppelt und synchron-gesteuert. Hierbei sind die Düsen in Abhängigkeit von der Brennerflamme einstellbar.All existing flow channels are advantageously coupled to one another and controlled synchronously. The nozzles are adjustable depending on the burner flame.

Diese Ausbildung der Strömungskanäle erlaubt eine steuerbar regelbare Einleitung der Abgase und damit eine optimale Verbrennung derselben.This design of the flow channels allows a controllably controllable introduction of the exhaust gases and thus optimal combustion of the same.

Vorteilhaft ist dem ersten Mischer ein zweiter Mischer angeschlossen, welcher entsprechend dem ersten Mischer ausgebildet ist und wobei beide Doppelwellen-Zwangs-und Durchlauf-Mischer sind. Hierdurch wird eine besonders intensive Vermengung der Asphaltmischgut-Anteile gewährleistet.The first mixer is advantageously connected to a second mixer, which is designed in accordance with the first mixer and both are double-shaft forced and continuous mixers. This ensures a particularly intensive mixing of the asphalt mix components.

Vorteilhaft sind die Mischer beheizbar ausgebildet, wodurch eine genaue Einstellung des Asphaltmischgutes auf die gewünschte Endtemperatur möglich ist.The mixers are advantageously designed to be heatable, as a result of which an exact setting of the asphalt mixture to the desired final temperature is possible.

Weiter enthalten die Mischer Zugabevorrichtungen für Frisch-Bitumen und Füller-Material.The mixers also contain addition devices for fresh bitumen and filler material.

Hierdurch können die beiden, aus den vorgeschalteten Trommel-Vorrichtungen herausgeführten Asphaltmischgut-Anteile in ihrem Materialaufbau bezüglich der geforderten Endzusammensetzung des Asphaltmischgutes ergänzt werden.In this way, the two parts of the asphalt mix leading out of the upstream drum devices can be supplemented in their material structure with regard to the required final composition of the asphalt mix.

Ein die Erfindung nicht beschränkendes Ausführungsbeispiel ist in den Zeichnungen dargestellt und wird nachstehend beschrieben.An exemplary embodiment which does not restrict the invention is illustrated in the drawings and is described below.

Es zeigen :

  • Fig. 1 eine Systemskizze einer vollständigen Aufbereitungsanlage,
  • Fig. 2 eine Außenansicht der den Brenner enthaltenden Stirnwand der Trockentrommel 2 und
  • Fig. 3 einen teilweisen Schnitt gemäß Linie A-A in Fig. 2 durch die Trockentrommel 2.
Show it :
  • 1 is a system sketch of a complete processing plant,
  • Fig. 2 is an external view of the end wall containing the burner of the drying drum 2 and
  • 3 shows a partial section along line AA in FIG. 2 through the drying drum 2.

Die für die Durchführung des erfindungsgemäßen Verfahrens vorgeschlagene Vorrichtung besteht im wesentlichen aus einem im Gleichstrom betriebenen Trommelmischer 1, einer im Gegenstrom betriebenen Trockentrommel 2 sowie zwei dem Trommelmischer 1 und der Trockentrommel 2 nachgeordneten Mischern 3 und 4.The device proposed for carrying out the method according to the invention essentially consists of a drum mixer 1 operated in cocurrent, a drying drum 2 operated in countercurrent, and two mixers 3 and 4 arranged downstream of the drum mixer 1 and the drying drum 2.

Das aufzubereitende Asphaltmischgut MG setzte sich hauptsächlich aus einem Alt-Asphalt-Anteil MA und einem Neu-Material-Anteil MN unter Beigabe von Bitumen B und Füller-Material F zusammen.The asphalt mix M G to be processed was mainly composed of an old asphalt portion M A and a new material portion M N with the addition of bitumen B and filler material F.

Der Alt-Asphalt-Anteil MA wird von einer Lagervorrichtung 5 über eine Bandwaage 6 abgezogen und in den Trommelmischer 1 eingeleitet, wobei es durch den vom Brenner 7 aufgeheizten Innneraum des Trommelmischers hindurchgeführt wird. Der Trommelmischer 1 ist in seinem Innern mit herkömmlichen, im Querschnitt 8 angedeuteten Fördervorrichtungen 9 ausgestattet.The old asphalt portion M A is drawn off from a storage device 5 via a belt weigher 6 and introduced into the drum mixer 1, whereby it is passed through the interior space of the drum mixer heated by the burner 7. The interior of the drum mixer 1 is equipped with conventional conveying devices 9, indicated in cross section 8.

Der Trommelmischer 1 ist an seinem dem Brenner 7 gegenüberliegenden Ende mit einer schematisch angedeuteten Abgasleitung 10 versehen und über diese mit der Trockentrommel 2 verbunden. Die besondere Ausbildung der Abgasleitung 10 an der den Brenner 13 enthaltenden Stirnwand der Trockentrommel 2 ist weiter unten beschrieben.The drum mixer 1 is provided at its end opposite the burner 7 with a schematically indicated exhaust gas line 10 and connected to the drying drum 2 via this. The special design of the exhaust gas Line 10 on the end wall of the drying drum 2 containing the burner 13 is described below.

In dieser Trockentrommel 2 wird der darin aufzubereitende Neu-Material-Anteil MN über ein Bandwaage 11 von einer Vorratsvorrichtung 12 an der dem Brenner 13 gegenüberliegenden Stirnwand eingebracht und über ebenfalls in einem Querschnitt 14 schematisch angedeutete Förder- vorrichtungen 15 hindurchtransportiert und aufgeheizt.In this drying drum 2, the new material fraction M N to be processed therein is introduced via a belt weigher 11 from a storage device 12 on the end wall opposite the burner 13 and is transported and heated via conveyor devices 15, also indicated schematically in a cross section 14.

Die Trockentrommel 2 weist an ihrem dem Brenner 13 gegenüberliegenden Ende eine Abgasleitung 16 auf, welche mit einer Filterentstaubungsanlage 17 verbunden ist. Aus dieser Filterentstaubungsanlage werden die Abgase mittels einer Ventilationsvorrichtung 18 an die Umwelt abgegeben.The drying drum 2 has at its end opposite the burner 13 an exhaust pipe 16 which is connected to a filter dedusting system 17. The exhaust gases are released from this filter dedusting system into the environment by means of a ventilation device 18.

Die in dem Trommelmischer 1 und der Trockentrommel 2 erhitzten Asphaltmischgut-Anteile MA und- MN werden von einem ersten Mischer 3 aufgenommen, welcher, wie im Schnitt 19 schematisch dargestellt, als Doppelwellen-Zwangs-und Durchlauf-Mischer ausgebildet ist. Darüber hinaus ist dieser Mischer 3 beheizbar ausgebildet, beispielsweise in Form einer doppelwandigen Wanne, in deren Wandungs-Zwischenraum ein Heizmedium fließen kann.The asphalt mix fractions M A and -M N heated in the drum mixer 1 and the drying drum 2 are taken up by a first mixer 3, which, as shown schematically in section 19, is designed as a double-shaft forced and continuous mixer. In addition, this mixer 3 is designed to be heatable, for example in the form of a double-walled trough, in the wall space between which a heating medium can flow.

In diesen Mischer 3 werden wiederum in bestimmten Anteilen Frisch-Bitumen aus einem Bitumen-Vorratsbehälter 20 und Füller-Material F aus einem Füller-Vorratsbehälter 21 abgezogen und beigegeben und miteinander vermengt.In this mixer 3 fresh bitumen from a bitumen storage container 20 and filler material F from a filler storage container 21 are again drawn off and added and mixed together.

Dem Mischer 3 ist ein diesem baulich entsprechender zweiter Mischer 4 nachgeschaltet.The mixer 3 is followed by a structurally corresponding second mixer 4.

Schließlich wird das vollständig aufbereitete Asphaltmischgut MG aus dem zweiten Mischer 4 abgezogen und in einer Verladevorrichtung 22 bereitgestellt.Finally, the completely prepared asphalt mix M G is withdrawn from the second mixer 4 and made available in a loading device 22.

Die Abgasleitung 10, vom Trommelmischer 1 kommend, endet unmittelbar an der Stirnwand 23 des Trommelmischers 2 und ist als den Brenner 13 umgebender Zuführungskanal 24 ausgebildet, welcher über konzentrisch um die Brenneröffnung 25 angeordnete Öffnungen 26 mit dem Innenraum der Trockentrommel 2 verbunden ist. In den Öffnungen sind als Düsen ausgebildete schwenkbare Strömungskanäle 28 eingesetzt, welche den aus ihnen heraustretenden Strahl der Abgase in freiwählbaren Richtungen in den Innenraum 27 der Trockentrommel 2 einleiten können. Diese schwenkbaren Düsen 28 werden über Zugstangen 29 und einem Stellring 30 sowie Stellzylindern 31 gesteuert, wobei sämtliche Düsen 28 miteinander über dieses Stellsystem verbunden sind und miteinander gekoppelt synchrongesteuert werden können. Je nach Größe und Ausdehnung der Brennerflamme 32 ist die Winkelstellung der Düsen 28 einstellbar.The exhaust pipe 10, coming from the drum mixer 1, ends directly on the end wall 23 of the drum mixer 2 and is designed as a feed channel 24 surrounding the burner 13, which is connected to the interior of the drying drum 2 via openings 26 arranged concentrically around the burner opening 25. Swiveling flow channels 28 designed as nozzles are used in the openings, which can introduce the jet of exhaust gases emerging from them into the interior 27 of the drying drum 2 in freely selectable directions. These pivotable nozzles 28 are controlled via tie rods 29 and an adjusting ring 30 and actuating cylinders 31, all of the nozzles 28 being connected to one another via this actuating system and being able to be synchronously controlled coupled to one another. The angular position of the nozzles 28 can be adjusted depending on the size and extent of the burner flame 32.

Durch die vorbeschriebene Ausbildung der Öffnungen 26 in der Stirnwand 23 der Trockentrommel 2 wird ermöglicht, den jeweiligen Strahl der einzelnen Düsen so zu lenken, daß je nach Ausdehnung der Brennerflamme 32 das einzublasende Abgas nicht unmittelbar in die Brennerflamme 32 hineingeblasen, sondern in einem bestimmten Abstand dazu an dieser vorbeigeführt wird. Hierdurch wird insbesondere erreicht, daß immer eine vollständige Verbrennung des Brennstoffes des Brenners innerhalb der Brennerflamme 10 erfolgt und gleichzeitig das eingeführte Abgas optimal ausgebrannt wird.The above-described formation of the openings 26 in the end wall 23 of the drying drum 2 makes it possible to steer the respective jet of the individual nozzles in such a way that, depending on the extension of the burner flame 32, the exhaust gas to be blown in is not blown directly into the burner flame 32, but at a certain distance is guided past this. This ensures in particular that there is always complete combustion of the fuel of the burner within the burner flame 10 and at the same time the introduced exhaust gas is optimally burned out.

Claims (21)

1. A process for processing asphalt mixtures with the re-use of broken-up, used asphalt and the addition of new material, using a plurality of burner-heated drum devices, characterized in that the used asphalt fraction (MA) and the new material fraction (MN) of the asphalt mixture (MG) to be processed or prepared are each processed, that is, in particular, heated, in drum devices of different construction, in which the used asphalt fraction (MA) is heated in a drum mixer (1) with co-current operation and the new material fraction (MN) is heated separately in a drying drum (2) with countercurrent operation and, after leaving the respective drum devices (1 and 2), they are then passed to at least one further mixer (3) connected downstream where they are treated further, in which fresh bitumen and filler material (F) are added to the mixer (3) if necessary, and in that the exhaust gases from the drum mixer (1) are introduced directly into the drying drum (2) where they are heated further and the CHx and CO fractions contained in the exhaust gases are thereby burnt.
2. A process according to claim 1, characterized in that the waste gases from the drum mixer (1) are introduced into the interior (27) of the drying drum (2) in the immediate vicinity of the burner flame (32) via a supply device at the end wall (23) of the drying drum (2) which contains the burner (13).
3. A process according to claim 2, characterized in that, depending on the respective size or extent of the burner flame (32), the waste gases from the drum mixer (1) are intentionally guided towards it or directed just past it.
4. A process according to claim 3, characterized in that the waste gases from the drum mixer (1) are directed around the burner flame (32) in the form of an, at least in part, enveloping flow.
5. A process according to claim 1, characterized in that the used asphalt fraction (MA) in the drum mixer is preferably heated to approximately 170 °C and the new material fraction (MN) in the drying drum is preferably heated to approximately 1800 - 350°.
6. A process according to claim 1, characterized in that there is adjustable control of the mixing ratio of the used asphalt fraction (M/J and the new material fraction (MN) in the asphalt mixture (MG).
7. A process according to claim 6, characterized in that the used asphalt fraction (MA) predominates to a considerable extent in the asphalt mixture.
8. A process according to claim 1, characterized in that the asphalt mixture (MG) composed in a given mixing ratio of used asphalt fraction (MA) and new material fraction (MN) is heated further in the connected mixer (3) and maintained at the required final temperature.
9. A process according to claim 1, characterized in that bitumen (B) and filler material (F) is added to the asphalt mixture (MG) in the mixer (3) in a mixing ratio over which there is adjustable control.
10. A process according to claim 1, characterized in that after passing through the first mixer (3) the asphalt mixture (MG) is preferably processed further in a second, connected, mixer (4).
11. A device for carrying out the process according to any of claims 1 to 10, characterized in that two drum devices operating in parallel are provided for the separate processing, that is, in particular, heating, of the used asphalt fraction (MA) and the new material fraction (MN), in which the drum device provided for the processing of the used asphalt fraction (MA) is a drum mixer (1) with co-current operation and the drum device provided for processing the new material fraction (MN) is a drying drum (2) with counter-current operation, in that the material discharge points of the two drum devices (1 or 2) are connected to at least one subsequent mixer (3), and in that the drum mixer (1) and the drying drum (2) are joined to one another by an exhaust gas line (10) which terminates in the form of a supply duct (24) at the end wall (23) of the drying drum (2) which contains the burner (13) and which is connected by openings (26) with the interior (27) of the drying drum (2).
12. A device according to claim 11, characterized in that the openings (26) are constructed as flow ducts (7).
13. A device according to claim 12, characterized in that the flow ducts (7) are constructed as nozzles.
14. A device according to claim 12, characterized in that the flow ducts (7) are positioned concentrically around the burner opening (25).
15. A device according to claim 12, characterized in that the flow ducts (7) are constructed so that they can be adjusted with respect to the direction of their jets and with respect to the direction of the flame of the burner (13).
16. A device according to claim 15, characterized in that all the flow ducts (7) present are coupled to one another.
17. A device according to claim 16, characterized in that all the flow ducts (7) present are controlled synchronously.
18. A device according to claim 17, characterized in that the flow ducts (7) can be adjusted as a function of the size of the burner flame (32).
19. A device according to claim 11, characterized in that to the first mixer (3) is connected a second mixer (4) which is constructed in the same way as the first mixer (3), and in that the mixer or mixers (3 and 4) is or are a twin-shaft, positive and continuous mixer(s).
20. A device according. to claim 19, characterized in that the mixer or mixers (3 and 4) is or are constructed so that it or they can be heated.
21. A device according to claim 11, characterized in that the mixer or mixers (3 and 4) contains or contain feeding devices for fresh bitumen and filler material.
EP85113874A 1984-11-13 1985-10-31 Process and apparatus for preparing an asphaltic mixture with recycled old asphalt Expired EP0183079B1 (en)

Priority Applications (1)

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AT85113874T ATE36017T1 (en) 1984-11-13 1985-10-31 METHOD AND APPARATUS FOR RECYCLING MIXED ASPHALT USING CRUCKED-UP WASTE ASPHALT.

Applications Claiming Priority (2)

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DE3441382A DE3441382A1 (en) 1984-11-13 1984-11-13 METHOD AND DEVICE FOR PROCESSING ASPHALT
DE3441382 1984-11-13

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EP0183079B1 true EP0183079B1 (en) 1988-07-27

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EP (1) EP0183079B1 (en)
JP (1) JPS62500732A (en)
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WO (1) WO1986002962A1 (en)

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DK153712B (en) 1988-08-22
DE3441382A1 (en) 1986-05-22
ATE36017T1 (en) 1988-08-15
WO1986002962A1 (en) 1986-05-22
EP0183079A1 (en) 1986-06-04
DK153712C (en) 1996-02-12
DK329486D0 (en) 1986-07-11
DE3563996D1 (en) 1988-09-01
US4705404A (en) 1987-11-10
DK329486A (en) 1986-07-11
JPS62500732A (en) 1987-03-26
DE3441382C2 (en) 1987-07-02

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