EP0146939A2 - Device and method for heating crushed asphalt - Google Patents

Device and method for heating crushed asphalt 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
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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Withdrawn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
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German (de)
French (fr)
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EP0146939A3 (en
Inventor
Felix Dr. Ing. Huster
Hermann Märtens
Franz Dipl. Ing. Rode
Guntram Dr. Ing. Kohler
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Deutag Mischwerke GmbH
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Deutag Mischwerke GmbH
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Publication date
Application filed by Deutag Mischwerke GmbH filed Critical Deutag Mischwerke GmbH
Publication of EP0146939A2 publication Critical patent/EP0146939A2/en
Publication of EP0146939A3 publication Critical patent/EP0146939A3/en
Withdrawn legal-status Critical Current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
    • E01C19/1004—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.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)

Abstract

For gentle and uniform heating of pre-crushed waste asphalt, the asphalt is fed into a housing (21) which contains at least one conveying channel (23) having a worm conveyor (22). Arranged above the worm conveyor (22), which transports and continuously circulates the asphalt, are infrared radiators (26) which are directed onto the free-flowing asphalt composition. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum Erhitzen von zerkleinertem Asphalt, mit mindestens einer in einem Gehäuse rotierenden Mischvorrichtung und mindestens einer an dem Gehäuse vorgesehenen Heizvorrichtung, sowie ein entsprechendes Verfahren.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.

Im Straßenbau wird in zunehmendem Maße Altasphalt benutzt, der aus alten, zum Um- oder Ausbau anstehenden Straßenbelägen gewonnen und zusammen mit unbenutztem Bitumen und/oder mit Mineralstoffen zu einer für neue Straßenbeläge u.dgl. verwendbaren Asphaltmasse gemischt wird. Derartige Belagmassen können einen Anteil von über 25 Gew.-% an Altasphalt enthalten. Um höhere Altasphaltanteile als 25 Gew.-% schadlos einsetzen zu können, ist eine thermische Vorbehandlung des Altasphalts erforderlich. Die Erhitzung des Altasphalts erfolgt bisher durch Einführen von Dampf oder Warmluft in die Altasphaltmasse oder durch Umwälzen der Asphaltmasse in einer beheizten Trockentrommel. In beiden Fällen ist der Energiebedarf erheblich. Bei Verwendung einer Trockentrommel besteht außerdem die Gefahr, daß der Altasphalt mit der die Trockentrommel heizenden offenen Flamme in Berührung kommt und die in ihm enthaltene Betumenmasse verbrennt.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. In order to be able to use higher amounts of old asphalt without damage, thermal pretreatment of the old asphalt is necessary. Up to now, 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. When using 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.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung und ein Verfahren der eingangs genannten Art so auszugestalten, daß eine schonende Erwärmung des Altasphalts mit geringem Energieaufwand erfolgt.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.

Zur Lösung dieser Aufgabe ist erfindungsgemäß vorgesehen, daß die Heizvorrichtung aus mehreren Infrarotstrahlern besteht, die auf das von der Förderschnecke umgewälzte Asphaltmaterial gerichtet sind.To achieve this object, it is provided according to the invention that the heating device consists of several infrared radiators which are directed towards the asphalt material circulated by the screw conveyor.

Nach der Erfindung wird ein wesentlicher Teil der Wärme durch Wärmestrahlung aufgebracht. Dadurch, daß der rieselfähige Asphalt von der Förderschnecke ständig umgewälzt und in Bewegung gehalten wird, wird verhindert, daß Teile oder einzelne Körner einer zu starken örtlichen Wärmebestrahlung ausgesetzt werden. Die Wärme verteilt sich gleichmäßig und schonend über das rieselfähige körnige Gut, das von der Förderschnecke transportiert und ständig neu durchmischt wird. Während des Durchlaufs des vorzerkleinerten Asphalts durch die För- derstrecke erhöht sich die Temperatur kontinuierlich, jedoch bleibt das Material bis zum Verlassen der För- derschnecke rieselfähig, so daß die Förderschnecke sich nicht zusetzt und der Prozeß des ständigen Umwälzens bis zum Verlassen der Förderstrecke aufrechterhalten wird.According to the invention, a substantial part of the heat is applied by heat radiation. The fact that 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. During the passage of the pre-crushed asphalt by the F OER DERS treks 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.

Infrarotstrahler haben den Vorteil eines hohen Wirkungsgrades. Ein hoher Anteil der den Infrarotstrahlern zugeführten Energie wird gezielt auf den Asphalt gerichtet, wobei durch das ständige Umwälzen eine gleichmäßige Temperaturverteilung in dem Asphaltgranulat erreicht wird und örtliche Uberhitzungen vermieden werden. Aus diesem Grund führt das Zusammenwirken der Infrarotstrahler mit einer Förderschnecke, die Rühr- und Fördervorgänge zugleich ausführt, zu besonders günstigen Ergebnissen.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. For this reason, 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.

Gemäß einer bevorzugten Ausführungsform der Erfindung sind die Infrarotstrahler in einem über der Förderschnecke verlaufenden, nach unten im wesentlichen offenen Kanal des Gehäuses angeordnet. Das Gehäuse ist hierbei mit einer thermischen Isolierschicht versehen, um die Wärmeverluste gering zu halten. Durch die Infrarotstrahler wird in erster Linie das Asphaltmaterial erwärmt und dieses erwärmt dann seinerseits die umgebende Luft. Ein erheblicher Wärmeanteil wird dem Asphalt also durch Wärmestrahlung zugeführt und nur ein relativ geringer Anteil durch Konvektion. Dies trägt zu einer schonenden und gleichmäßigen Erwärmung mit relativ geringem Energieaufwand bei.According to a preferred embodiment of the invention, 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.

Gemäß einer bevorzugten Ausführungsform der Erfindung sind zwischen den Infrarotstrahlern Luftdurchlaßöffnungen angeordnet und der Kanal ist mit einem Warmluftauslaß verbunden. Die mit dem Asphalt in Berühung kommende und sich erwärmende Luft wird durch die Luftdurchlaßöffnungen und den Warmluftauslaß abgeführt. Die in dieser Warmluft enthaltene Energie kann dem System auf andere Weise wieder zugeführt werden. Durch die Warmluftabfuhr wird verhindert, daß das System sich insgesamt auf eine zu hohe Temperatur erwärmt, bei der der Asphalt thermisch geschädigt wird, sich entmischt und bei der wichtige Bestandteile verdampfen und/oder verbrennen. Außerdem werden Gasbestandteile, die aus der Asphaltmasse entweichen, abgeführt.Der Warmluftauslaß ist vorzugweise über dem auslaßseitigen Ende der Förderschnecke angeordnet, weil sich dort die höchste Lufttemperatur einstellt.According to a preferred embodiment of the invention, 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. In addition, 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.

Das Gehäuse kann mit einer zweiten Heizvorrichtung aus Rohren, in denen ein Wärmeübertragungsmedium strömt, beheizt sein. Diese Rohre bewirken eine Erwärmung der Gehäusewände, die ihrerseits die Wärme auf den Altasphalt übertragen. Dieses relativ träge zweite Heizsystem kann als Grundheizung oder Vorheizung benutzt werden. Da die Asphaltpartikel immer nur vorübergehend mit dem Gehäuse in Kontakt kommen und da andererseits die Temperatur des Gehäuses geringer ist als die vorgesehene Endtemperatur, die der Asphalt beim Verlassen des Gehäuses haben soll, können durch die zweite Heizvorrichtung keine schädlichen thermischen Einwirkungen hervorgerufen werden.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.

Das erfindungsgemäße Verfahren ist dadurch gekennzeichnet, daß der Asphalt in einen Förderkanal, der mindestens eine Förderschnecke enthält, im rieselfähigen Zustand und in einer Menge eingegeben wird, daß er den Förderkanal nur im unteren Bereich des Förderkanalquerschnitts ausfüllt, und daß während des Durchlaufs durch den Förderkanal eine Bestrahlung mit Infrarotstrahlen von oben erfolgt. Durch die nur teilweise Füllung des Förderkanals mit Asphalt wird sichergestellt, daß eine ständige Umordnung der einzelnen Asphaltpartikel erfolgt.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.

Im folgenden wird unter Bezugnahme auf die Zeichnungen ein Ausführungsbeispiel der Erfindung näher erläutert.In the following an embodiment of the invention will be explained with reference to the drawings.

Es zeigen:

  • Fig. 1 eine schematische Darstellung einer Anlage zum Verarbeiten von Altasphalt und
  • Fig. 2 einen Längsschnitt der Vorrichtung zum Erwärmen des Altasphalts, hier jeweils dargestellt am Beispiel einer stationären Anlage.
Show it:
  • Fig. 1 is a schematic representation of a plant for processing old asphalt and
  • Fig. 2 shows a longitudinal section of the device for heating the old asphalt, shown here in each case using the example of a stationary plant.

Gemäß Fig. l wird Altasphalt von Förderfahrzeugen 10 in eine Aufgabevorrichtung 11 eingegeben, von der eine Förderer 12 zu einer Zerkleinerungsvorrichtung 13 führt. In der Zerkleinerungsvorrichtung 13 wird der Altasphalt zu einem körnigen Gut zerkleinert. Von der Zerkleinerungsvorrichtung 13 führt ein weiterer Förderer 14 zu einer Wiege- und Dosiereinrichtung 15, die über dem Einlaß der Erwärmungsvorrichtung 16 angeordnet ist. In der Erwärmungsvorrichtung 16 wird der Altasphalt auf eine Temperatur von ca. 150° C erwärmt und anschließend über eine weitere Wiege- und Dosiereinrichtung 17 einer Mischvorrichtung 18 zugeführt. In die Mischvorrichtung 18 werden ferner aus verschiedenen Bunkern 19 frische Bitumenmasse und Zuschlagstoffe in vorbestimmten Verhältnissen über eine weitere Wiege-und Dosiervorrichtung 20 eingegeben. In der Mischvorrichtung 18, die beispielsweise als Misch- und Förderschnecke oder als Rührwerk ausgebildet sein kann, werden alle zugegebenen Materialien miteinander vermischt, um eine möglichst homogene Endmasse zu erzielen. Die Erwärmungsvorrichtung 16, die in Fig. 2 dargestellt ist, weist ein langgestrecktes Gehäuse 21 auf, in dem zwei Förderschnecken 22, von denen in Fig. 2 nur eine sichtbar ist, parallel zueinander angeordnet sind. Jede Förderschnecke 22 verläuft in einem etwa halbzylindrischen Förderkanal 23 und ist von einem aufgabeseitig an dem Gehäuse 21 angebrachten Motor 24 angetrieben. Die Förderschnecken rotieren gegensinnig und ihre Schneckengänge haben gegensinnigen Verlauf, so daß sie in dieselbe Richtung fördern.According to Figure l RAP is input from Förderfahrzeu g s 10 in a feed device 11., From a conveyor 12 leads to a crusher. 13 In the crushing device 13, the old asphalt is crushed into a granular material. Another conveyor 14 leads from the comminution device 13 to a weighing and metering device 15 which is arranged above the inlet of the heating device 16. In the heating device 16, the old asphalt is heated to a temperature of approximately 150 ° C. and then fed to a mixing device 18 via a further weighing and metering device 17. Fresh bitumen mass and additives in predetermined proportions are also fed into the mixing device 18 from various bunkers 19 via a further weighing and metering device 20. In the mixing device 18, which can be designed, for example, as a mixing and conveying screw or as an agitator, all the materials added are mixed with one another in order to achieve a homogeneous final mass. 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.

über den Förderschnecken 22 weist das Gehäuse 21 einen längslaufenden Kanal 25 auf, in dem zahlreiche Infrarotstrahler 26 in Längsrichtung hintereinander mit gegenseitigen Abständen angeordnet sind. Die Infrarotstrahler 26 können beispielsweise mit elektrischem Strom, mit Gas oder auch mit Heizöl gespeist sein. Vorzugsweise wird man gasbetriebene Infrarotstrahler verwenden. Die Infrarotstrahler 26 haben nach unten gerichtete Strahlungsflächen, so daß die von ihnen abgegebene Wärmestrahlung auf die in den Förderkanälen 23 befindliche Asphaltmasse gerichtet ist. Die Wiege- und Dosiervorrichtung 15 steuert den Förderer 14 so, daß dieser den vorzerkleinerten Altasphalt nur in solcher Menge in die Förderkanäle 23 einfüllt, daß die Förderkanäle nur zum Teil gefüllt werden. Dadurch werden Verdichtungen des rieselfähigen Altasphalts in den Gängen der Förderschnecken 22 vermieden, und das Asphaltmaterial bleibt bis zum Verlassen der Förderkanäle 23 locker und rieselfähig. Die Temperatur ist so gesteuert bzw. geregelt, daß der die Förderkanäle 23 am Ende der Förderstrecke durch den Auslaß 27 verlassende Asphalt eine unterhalb seiner Schmelztemperatur von ca. 160° liegende Temperatur von etwa 150° hat.Above the screw conveyors 22, 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. As a result, compaction of the free-flowing old asphalt in the passages of the screw conveyors 22 is avoided, and the asphalt material remains loose and free-flowing until it leaves the conveying channels 23. 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 °.

Die in dem Gehäuse 21 befindliche Luft, die sich erwärmt, steigt zusammen mit den entwichenen Gasen durch die Luftdurchlaßöffnungen 28 zwischen den Infrarotstrahlern 26 auf und wird durch den Kanal 25 abgeführt. Am abwurfseitigen Ende des Kanals 25 befindet sich ein Warmluftauslaß 29, an den ein Sauggebläse angeschlossen sein kann, um die Warmluft abzusaugen. Ein Teil der das Gehäuse verlassenden Warmluft kann über (nicht dargestellte) Rückführkanäle wieder in das Gehäuse zurückgeführt werden. Es ist auch möglich, die abgeführte Warmluft, die anderweitige Gase enthalten kann, in einem Wärmeaustauscher abzukühlen und die Wärme dem Gehäuse 21 anderweitig wieder zuzuführen.The air in the housing 21, which heats up, rises together with the escaped gases through the air passage openings 28 between the infrared radiators 26 and is discharged through the channel 25. 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.

Das Gehäuse 21 ist von einem Rohrmantel umgeben, der von Thermoöl oder von einem anderen Heizmedium durchflossen ist. Der Rohrmantel, der an der wärmeleitenden Gehäuseinnenwand anliegt, ist, ebenso wie das gesamte Gehäuse 21, von einem wärmeisolierenden Mantel 31 umgeben.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.

Jeder Infrarotstrahler 26 ist an seinem dem Warmluftauslaß 29 zugewandten Ende mit einem Leitblech 30 versehen, das die durch die Luftdurchlaßöffnung 28 aufsteigende Warmluft in Richtung auf den Warmluftauslaß 29 leitet.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.

Bei dem obigen Ausführungsbeispiel ist die Verarbeitungsvorrichtung für den Altasphalt stationär. Die Vorrichtung kann auch mobil ausgebildet sein, und mit entsprechenden Rädern versehen werden. Ferner sind semimobile Vorrichtungen möglich, die an einen anderen Einsatzort eingesetzt werden können.In the above embodiment, 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.

Der Vorrichtung muß nicht ausschließlich Altasphalt zur Verarbeitung zugeführt werden, sondern sie kann zusätzlich unter Zugabe unbenutzter Ergänzungs-Baustoffe wie Mineralstoffe, Bindemittel, Additive o.dgl. verwendet werden.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.

Claims (6)

1. Vorrichtung zum Erhitzen von zerkleinertem Asphalt, mit mindestens einer in einem Gehäuse (21) rotierenden Mischvorrichtung und mindestens einer an dem Gehäuse vorgesehenen Heizvorrichtung, dadurch gekennzeichnet, daß die Heizvorrichtung aus mehreren Infrarotstrahlern (26) besteht, die auf das von der Mischvorrichtung umgewälzte Asphaltmaterial gerichtet sind.1. A device for heating crushed asphalt, with at least one in a housing (21) rotating mixing device and at least one provided on the housing heating device, characterized in that the heating device consists of a plurality of infrared radiators (26) which are circulated on by the mixing device Asphalt material are directed. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Infrarotstrahler (26) in einem über der Mischvorrichtung verlaufenden, nach unten im wesentlichen offenen Kanal (25) des Gehäuses (21) angeordnet sind.2. Device according to claim 1, characterized in that the infrared radiators (26) are arranged in a running above the mixing device, downwardly substantially open channel (25) of the housing (21). 3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß zwischen den Infrarotstrahlern (26) Luftdurchlaßöffnungen (28) angeordnet sind und daß der Kanal (25) mit einem Warmluftauslaß (29) verbunden ist.3. Apparatus according to claim 2, characterized in that between the infrared radiators (26) air passage openings (28) are arranged and that the channel (25) is connected to a warm air outlet (29). 4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Warmluftauslaß (29) über dem auslaßseitigen Ende der als Förderschnecke (22) ausgebildeten Mischvorrichtung angeordnet ist.4. The device according to claim 3, characterized in that the hot air outlet (29) is arranged above the outlet end of the mixing device designed as a screw conveyor (22). 5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Gehäuse (21) mit einer zweiten Heizvorrichtung aus Rohren, in denen ein Wärmeübertragungsmedium strömt, beheizt ist.5. Device according to one of claims 1 to 4, characterized in that the housing (21) is heated with a second heating device made of tubes in which a heat transfer medium flows. 6. Verfahren zum Erhitzen von zerkleinertem Altasphalt, dadurch gekennzeichnet, daß der Altasphalt in einen Förderkanal (23), der mindestens eine Förderschnecke (22) enthält, im rieselfähigen Zustand in einer Menge eingegeben wird, daß er den Förderkanal nur im unteren Bereich des Kanalquerschnitts ausfüllt und daß während des Durchlaufs durch den Förderkanal eine Bestrahlung mit Infrarotstrahlen von oben erfolgt.6. A method for heating shredded old asphalt, characterized in that the old asphalt in a conveying channel (23), which contains at least one screw conveyor (22), is entered in a free-flowing state in an amount that it only the conveyor channel in the lower region of the channel cross section fills in and that during the passage through the conveying channel there is irradiation with infrared rays from above.
EP84115988A 1983-12-29 1984-12-20 Device and method for heating crushed asphalt Withdrawn EP0146939A3 (en)

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DE19833347370 DE3347370C1 (en) 1983-12-29 1983-12-29 Device for heating shredded asphalt
DE3347370 1983-12-29

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EP0146939A3 EP0146939A3 (en) 1986-08-20

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DE (1) DE3347370C1 (en)
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Cited By (6)

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Publication number Priority date Publication date Assignee Title
WO1989003914A1 (en) * 1987-10-22 1989-05-05 Karl Martin Stahl Heated mixer-conveyor for continuous manufacture of road asphalt or poured asphalt
WO1997016600A1 (en) * 1995-11-02 1997-05-09 Amomatic Oy Method and apparatus for heating rock material
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 (en) * 1998-09-07 2000-03-15 Talbot Technology Limited Rothamsted Research Station Process and apparatus for recycling asphalt
FR2866037A1 (en) * 2004-02-09 2005-08-12 Emile Lopez METHOD AND DEVICE FOR TEMPERATURING GRANULATES AND / OR ROAD COVERS, IN PARTICULAR COATED USES FOR RECYCLING
FR3091543A1 (en) * 2019-01-08 2020-07-10 Colas Aggregate coating device, its implementation process and its uses

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4110981A1 (en) * 1991-04-05 1992-10-08 Wibau Gmbh METHOD FOR THE PRODUCTION OF ASPHALT MIXTURES WITH A DRY AND HEATING DRUM ARRANGED ABOVE THE MIXING TOWER, AND ADDITION TO THE METHOD FOR THE PARTIAL TASK OF THE EXHAUST GAS COOLING AND WASHING

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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 (en) * 1978-11-17 1980-06-13 Creusot Loire DEVICE FOR THE PREPARATION OF BITUMINOUS COATED PRODUCTS FOR ROAD COVERINGS
GB2115711A (en) * 1982-01-27 1983-09-14 Ben Travis A highway asphalt and coated a recycling machine
US4418682A (en) * 1981-06-01 1983-12-06 Poweray Infrared Corporation Asphalt reclamation unit

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US4136964A (en) * 1977-04-14 1979-01-30 Cmi Corporation Apparatus for simultaneously mixing and conveying particulate material

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Publication number Priority date Publication date Assignee Title
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 (en) * 1978-11-17 1980-06-13 Creusot Loire DEVICE FOR THE PREPARATION OF BITUMINOUS COATED PRODUCTS FOR ROAD COVERINGS
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 (en) * 1987-10-22 1989-05-05 Karl Martin Stahl Heated mixer-conveyor for continuous manufacture of road asphalt or poured asphalt
WO1997016600A1 (en) * 1995-11-02 1997-05-09 Amomatic Oy Method and apparatus for heating rock material
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 (en) * 1998-09-07 2000-03-15 Talbot Technology Limited Rothamsted Research Station Process and apparatus for recycling asphalt
FR2866037A1 (en) * 2004-02-09 2005-08-12 Emile Lopez METHOD AND DEVICE FOR TEMPERATURING GRANULATES AND / OR ROAD COVERS, IN PARTICULAR COATED USES FOR RECYCLING
WO2005075742A1 (en) * 2004-02-09 2005-08-18 Emile Lopez Method and device for heating worn road coating materials
US9045867B2 (en) 2004-02-09 2015-06-02 Fenixfalt Method and device for heating worn road coating materials
FR3091543A1 (en) * 2019-01-08 2020-07-10 Colas Aggregate coating device, its implementation process and its uses
WO2020144432A1 (en) 2019-01-08 2020-07-16 Colas Device for coating aggregates, method and uses

Also Published As

Publication number Publication date
DK620284D0 (en) 1984-12-21
DK620284A (en) 1985-06-30
DE3347370C1 (en) 1985-05-23
EP0146939A3 (en) 1986-08-20
NO845241L (en) 1985-07-01

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