EP2056053B1 - Web of material drying arrangement - Google Patents

Web of material drying arrangement Download PDF

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Publication number
EP2056053B1
EP2056053B1 EP08105677A EP08105677A EP2056053B1 EP 2056053 B1 EP2056053 B1 EP 2056053B1 EP 08105677 A EP08105677 A EP 08105677A EP 08105677 A EP08105677 A EP 08105677A EP 2056053 B1 EP2056053 B1 EP 2056053B1
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EP
European Patent Office
Prior art keywords
air
dryer
material web
exhaust
drying arrangement
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EP08105677A
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German (de)
French (fr)
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EP2056053A3 (en
EP2056053A2 (en
Inventor
Richard Dr. Aust
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Voith Patent GmbH
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Voith Patent GmbH
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00Drying solid materials or objects by processes involving the application of heat
    • F26B3/28Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/283Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials

Definitions

  • the invention relates to a material web dryer arrangement with at least one radiation dryer and at least one air dryer, wherein the air dryer has a first air supply system with supply air and exhaust air.
  • a web dryer assembly of this type is used, for example, in the manufacture of a paper web to dry it.
  • the radiation dryer has a relatively high power density, i. he can transfer a relatively large amount of heat to the web, so that the water contained therein can evaporate well. Although the air dryer transmits a smaller amount of heat to the web. But he is able to support the web contact.
  • a web dryer arrangement of the type mentioned is, for example WO 2005/085729 known.
  • the radiation dryer is connected upstream of the air dryer.
  • Several such arrangements of radiation dryer and air dryer can be arranged one behind the other. Heated air from the radiation dryer is collected by the air dryer and optionally blown after reheating on the web.
  • EP 1 169 511 A similar embodiment is made EP 1 169 511 known. Here, too, heated air passes from the radiation dryer into a capture device of the air dryer, where it is taken up, circulated and blown back onto the material web.
  • Out DE 39 10 898 B4 is a combination dryer with a radiation dryer and an air dryer is known in which the radiation dryer is heated with air, which is branched off from a feed stream for the air dryer. Heated air from the radiation dryer is fed to the housing of the air dryer, sucked there, mixed with fresh air and circulated again, the combination of already heated air and fresh air is heated by a heater again.
  • EP 0 336 120 A2 discloses a combination dryer with two separate air handling systems. Only the radiation dryer has a connection between supply air and exhaust air.
  • the invention has for its object to achieve the highest possible efficiency with the least possible impairment of the quality of the web.
  • the radiation dryer has a second air duct system with supply air and exhaust air, both air ducts each having a connection of supply air and exhaust air and both air ducts are interconnected only in the region of their respective exhaust air.
  • the radiation dryer In the entire process of drying the web, of course, an additional air supply is required. However, this can be ensured via the radiation dryer. If it is a gas-powered radiation dryer, then this radiation dryer needs a combustion air. If it is an electrically powered radiation dryer, then this dryer requires cooling air. As a radiation dryer is preferably an infrared dryer into consideration.
  • a conveyor is arranged in each connection.
  • the conveyors only have to generate the respective current within the respective air guidance system. They can therefore be made comparatively weak, i. have a low pressure level and a low flow rate. This makes the web dryer assembly inexpensive to manufacture and in operation, although two conveyors are used.
  • both conveyors are independently controllable. One can therefore control the air flow in the first air duct system differently than in the second air duct system.
  • a first fresh air connection is provided in the second air duct system in the connection of exhaust air and supply air. So you can for example proceed in such a way that only a small part of the exhaust air, For example, 20%, promotes back to the supply air and this part so far mixed with fresh air that it cools to a value in the order of 120 to 140 ° C. In this way, the danger of mottling can be reduced in a paper web and the condensation of water on the cold web can be avoided.
  • a heating device is provided in the first air duct system in the connection of exhaust air and supply air. This heater heats the air expelled through the air dryer to dry the web, when the radiant dryer with its exhaust air does not have enough heat available.
  • a second fresh air connection is provided in the first air guidance system in the connection of exhaust air and supply air. Normally, this fresh air connection should be closed, for example by a flap. If the heater is present, then the second fresh air connection may be useful for rinsing.
  • a controllable exhaust air outlet is arranged in the first air duct between the air dryer and the connection of the exhaust air of both air ducts.
  • the exhaust air from the air dryer represents the point of the web dryer arrangement where the drying air is at its coldest, with no fresh air supplied, and the highest water vapor loading. Therefore, it is energetically useful here to deduct the exhaust air at this point. This also increases the efficiency.
  • the exhaust outlet on a conveyor may be used to control the exhaust outlet.
  • the conveyor may be used to control the exhaust outlet.
  • more exhaust air is released to the outside than when the conveyor is operated at a low power.
  • the conveying device in the exhaust air outlet has a lower pressure output than the conveying device in the connections of the two air guiding systems. This keeps costs low.
  • a Abschottklappe is arranged in the first air duct system and / or in the second air duct system. If you close the Abschottklappe, then a circulation is prevented by the respective air duct system or at least greatly throttled.
  • This embodiment has advantages, in particular in the case of radiation dryers, which are designed as gas-operated IR dryers. The Abschottklappe the restarting of such radiation dryer is not disturbed by the circulating air.
  • a material web dryer arrangement 1 serves to dry a material web 2, which passes by the material web dryer arrangement 1 in a direction indicated by an arrow 3.
  • the material web 2 first passes through a radiation dryer 4, which is designed as an infrared dryer and then an air dryer. 5
  • the radiation dryer 4 is supplied via an inlet 6 air, which is formed depending on the design of the radiation dryer 4 as combustion air (in a gas-powered infrared dryer) or as cooling air (in an electrically operated infrared dryer).
  • a motor 7 drives a fan 8.
  • Radiation dryer 4 is on the one hand radiant heat to the web 2 from, on the other hand, it heats the registered air. Heated air is removed together with the evaporated water from the material web and - in the case of gas-heated infrared radiators - the combustion exhaust gases as exhaust air 9.
  • the exhaust air 9 is guided in a line or a line arrangement.
  • a fresh air connection 12 is provided in the connection 10.
  • a conveying device comprising a motor 13 and a fan 14 conveys the supply air 11 into the radiation dryer 4. Via the admixture of the air from the fresh air connection 12, this supply air 11 is cooled to approximately 120 to 140 ° C. In this way, in the case of a paper web, the danger of mottling can be reduced and, in general, in the case of a material web 2, the condensation of water on the material web 2 can be prevented.
  • the blower 14 may be made relatively small and have a relatively low pressure level of, for example, about 30 mbar. Conventional systems have required 50 mbar or more.
  • the motor 13 is controllable by a control device, not shown, in particular depending on the temperature of the supply air eleventh
  • a Abschottklappe 15 is provided in the connection 10 .
  • the Abschottklappe 15 is normally open. It is closed, for example, when 4 individual IR modules have to be restarted in the radiation dryer and should not be disturbed by the circulating air.
  • the air dryer 5 has a supply air 16 and an exhaust air 17. As already mentioned in connection with the radiation dryer 4, of course, all air flows are routed in lines or line arrangements.
  • a compound 18 is arranged between the exhaust air 17 and the supply air 16.
  • a conveyor 19 having a motor 19 and a fan 20 is arranged in the connection.
  • a Abschottklappe 21 is arranged in the connection.
  • a heating device 22 may be arranged in the connection 18 or in the supply air 16, then it is expedient to provide a fresh air connection 23 which, just like the fresh air connection 12, is designed to be controllable. If necessary, this fresh air connection 23 serves to rinse the circuit through the air dryer 5.
  • the air dryer 5 thus has a first air guidance system 24 and the radiation dryer 4 has a second air guidance system 25.
  • Both air guide systems have a connection 18, 10 of supply air 16, 11 and exhaust air 17, 9.
  • Both air guide systems 24, 25 are connected to each other in the region of their exhaust air 17, 9, i.
  • an exhaust outlet 27 is arranged, which has a motor 28 and a fan 29 having conveyor.
  • This conveyor has an even lower capacity than the other two conveyors 13, 14 and 19, 20. For example, a pressure rating of only 20 mbar is sufficient here.
  • the exhaust outlet 27 is arranged in the first air duct system 24 where the drying air is coldest (apart from the supply air 11 of the infrared dryer, which is only mixed with fresh air for quality reasons) and has the highest moisture content. The laden exhaust air is withdrawn at the exhaust outlet 27 with the least energy losses.
  • the web dryer arrangement 1 operates as follows: a small portion, for example 20%, of the exhaust air 9 of the radiation dryer is mixed with fresh air and thereby cooled to about 120 to 140 ° C and fed back to the radiation dryer 4 as supply air or blowing air. The largest part of the exhaust air 9 of the radiation dryer 4 is fed into the air duct system 24 of the air dryer 5. In many cases, the heat energy introduced by this will already be sufficient to operate the air dryer 5 can. If this is not the case, additional heat can be entered via the heating device 22. As the air in the Air dryer 5 loaded with moisture, a portion of this air is removed via the exhaust outlet 27. In the radiation dryer 4, on the other hand, the danger of too high a loading of moisture is relatively low, because here fresh air is continuously supplied via the inlet 6 and via the fresh air connection 12.

Description

Die Erfindung betrifft eine Materialbahntrockneranordnung mit mindestens einem Strahlungstrockner und mindestens einem Lufttrockner, wobei der Lufttrockner ein erstes Luftführungssystem mit Zuluft und Abluft aufweist.The invention relates to a material web dryer arrangement with at least one radiation dryer and at least one air dryer, wherein the air dryer has a first air supply system with supply air and exhaust air.

Eine Materialbahntrockneranordnung dieser Art wird beispielsweise bei der Herstellung einer Papierbahn verwendet, um diese zu trocknen. Der Strahlungstrockner hat eine relativ hohe Leistungsdichte, d.h. er kann eine relativ große Wärmemenge auf die Materialbahn übertragen, so dass das darin befindliche Wasser gut verdampfen kann. Der Lufttrockner überträgt zwar eine geringere Wärmemenge auf die Materialbahn. Er ist aber in der Lage, die Materialbahn berührungsfrei abzustützen.A web dryer assembly of this type is used, for example, in the manufacture of a paper web to dry it. The radiation dryer has a relatively high power density, i. he can transfer a relatively large amount of heat to the web, so that the water contained therein can evaporate well. Although the air dryer transmits a smaller amount of heat to the web. But he is able to support the web contact.

Eine Materialbahntrockneranordnung der eingangs genannten Art ist beispielsweise aus WO 2005/085729 bekannt. Der Strahlungstrockner ist hierbei dem Lufttrockner vorgeschaltet. Es können mehrere derartige Anordnungen aus Strahlungstrockner und Lufttrockner hintereinander angeordnet sein. Erwärmte Luft vom Strahlungstrockner wird vom Lufttrockner aufgefangen und gegebenenfalls nach erneuter Erwärmung auf die Materialbahn geblasen.A web dryer arrangement of the type mentioned is, for example WO 2005/085729 known. The radiation dryer is connected upstream of the air dryer. Several such arrangements of radiation dryer and air dryer can be arranged one behind the other. Heated air from the radiation dryer is collected by the air dryer and optionally blown after reheating on the web.

Eine ähnliche Ausgestaltung ist aus EP 1 169 511 bekannt. Auch hier gelangt erwärmte Luft vom Strahlungstrockner in eine Fangeinrichtung des Lufttrockners, wo sie aufgenommen, umgewälzt und wieder auf die Materialbahn geblasen wird.A similar embodiment is made EP 1 169 511 known. Here, too, heated air passes from the radiation dryer into a capture device of the air dryer, where it is taken up, circulated and blown back onto the material web.

Aus DE 39 10 898 B4 ist ein Kombinationstrockner mit einem Strahlungstrockner und einem Lufttrockner bekannt, bei dem der Strahlungstrockner mit Luft erwärmt wird, die aus einem Speisestrom für den Lufttrockner abgezweigt wird. Erwärmte Luft aus dem Strahlungstrockner wird dem Gehäuse des Lufttrockners zugeführt, dort abgesaugt, mit Frischluft versetzt und erneut umgewälzt, wobei die Kombination aus bereits erwärmter Luft und Frischluft durch eine Heizeinrichtung erneut beheizt wird.Out DE 39 10 898 B4 is a combination dryer with a radiation dryer and an air dryer is known in which the radiation dryer is heated with air, which is branched off from a feed stream for the air dryer. Heated air from the radiation dryer is fed to the housing of the air dryer, sucked there, mixed with fresh air and circulated again, the combination of already heated air and fresh air is heated by a heater again.

EP 0 336 120 A2 offenbart einen Kombinationstrockner mit zwei getrennten Luftführungssystemen. Nur der Strahlungstrockner hat eine Verbindung von Zuluft und Abluft. EP 0 336 120 A2 discloses a combination dryer with two separate air handling systems. Only the radiation dryer has a connection between supply air and exhaust air.

Der Vorgang der Trocknung einer Materialbahn ist energetisch um so günstiger, je geringer die zugeführte Frischluftmenge ist. Im Idealfall würde man daher die Frischluftzufuhr vollständig abschalten. Dies hat allerdings den Nachteil, dass sich eine hohe Lufttemperatur und eine hohe Feuchtigkeitsbeladung einstellen. Während die hohe Lufttemperatur in Hinsicht auf eine möglichst hohe Trocknungsleistung grundsätzlich von Vorteil ist, kann sie sich allerdings bei manchen Materialbahnen, beispielsweise bei grafischen Papieren, im Hinblick auf die Qualität der Materialbahn auch als nachteilig erweisen. Bei grafischen Papieren kann sie beispielsweise ein so genanntes Mottling hervorrufen. Wenn die Materialbahn beim Eintritt in den Strahlungstrockner noch relativ kalt ist, dann kann die hohe Feuchtigkeitsbeladung der Luft außerdem zu ebenfalls unerwünschten Kondensationserscheinungen auf der zu trocknenden Materialbahn führen. Aus diesem Grund wird bei empfindlichen Materialbahnen in der Praxis soviel Frischluft zugeführt, dass die Lufttemperatur 120 bis 140°C nicht übersteigt, was aus energetischer Sicht nachteilig ist.The process of drying a web is energetically the cheaper, the lower the amount of fresh air supplied. Ideally, therefore, one would completely switch off the supply of fresh air. However, this has the disadvantage that set a high air temperature and a high moisture content. While the high air temperature is fundamentally advantageous in terms of the highest possible drying performance, it may also be disadvantageous in some material webs, for example in graphic papers, in view of the quality of the material web. For graphic papers, for example, it can cause so-called mottling. If the material web is still relatively cold when entering the radiation dryer, then the high moisture content of the air can also lead to undesirable condensation phenomena on the material web to be dried. For this reason, in the case of sensitive material webs in practice so much fresh air is supplied that the air temperature does not exceed 120 to 140 ° C, which is disadvantageous from an energetic point of view.

Der Erfindung liegt die Aufgabe zugrunde, einen möglichst hohen Wirkungsgrad bei möglichst geringer Beeinträchtigung der Qualität der Materialbahn zu erreichen.The invention has for its object to achieve the highest possible efficiency with the least possible impairment of the quality of the web.

Diese Aufgabe wird bei einer Materialbahntrockneranordnung der eingangs genannten Art dadurch gelöst, dass der Strahlungstrockner ein zweites Luftführungssystem mit Zuluft und Abluft aufweist, beide Luftführungssysteme mit jeweils einer Verbindung von Zuluft und Abluft aufweisen und beide Luftführungssysteme lediglich im Bereich ihrer jeweiligen Abluft miteinander verbunden sind.This object is achieved in a web dryer arrangement of the type mentioned above in that the radiation dryer has a second air duct system with supply air and exhaust air, both air ducts each having a connection of supply air and exhaust air and both air ducts are interconnected only in the region of their respective exhaust air.

Mit dieser Ausgestaltung kann man auch beim Strahlungstrockner einen guten Wirkungsgrad erreichen. Die bereits erwärmte Luft wird zumindest teilweise wieder zurückgeführt, so dass die dem Strahlungstrockner zugeführte Energie zu einem größeren Teil für die Aufheizung der Materialbahn genutzt werden kann. Gleichzeitig kann man aber auch die Lufttemperaturen im Strahlungstrockner und im Lufttrockner zumindest weitgehend entkoppeln, so dass man in den beiden Trocknungsstufen, also dem Strahlungstrockner und dem Lufttrockner, jeweils Luft mit einer optimal eingestellten Temperatur verwenden kann. Gleichzeitig ist es möglich, die Wärme, die durch den Strahlungstrockner in die Luft eingetragen worden ist, über die Abluft des Strahlungstrockners auch in das Luftführungssystem des Lufttrockners einzuspeisen, so dass zur Aufheizung der Luft dort weniger Energie benötigt wird. Man ist nicht mehr darauf angewiesen, dass erwärmte Luft auf dem Umweg über die Umgebung in den Lufttrockner gelangt. Bei dem gesamten Vorgang des Trocknens der Materialbahn ist natürlich eine zusätzliche Luftzufuhr erforderlich. Diese kann aber über den Strahlungstrockner gewährleistet werden. Wenn es sich um einen gasbetriebenen Strahlungstrockner handelt, dann benötigt dieser Strahlungstrockner eine Verbrennungsluft. Wenn es sich um einen elektrisch betriebenen Strahlungstrockner handelt, dann benötigt dieser Trockner eine Kühlluft. Als Strahlungstrockner kommt vorzugsweise ein Infrarot-Trockner in Betracht.With this configuration, one can also achieve good efficiency in the radiation dryer. The already heated air is at least partially returned, so that the energy supplied to the radiation dryer can be used to a greater extent for heating the material web. At the same time, however, it is also possible to decouple the air temperatures in the radiation dryer and in the air dryer at least to a large extent, so that in the two drying stages, ie the radiation dryer and the air dryer, in each case air with an optimum set temperature can use. At the same time it is possible, the heat that has been registered by the radiation dryer in the air, via the exhaust air of the radiation dryer also feed into the air ducting of the air dryer, so that there is less energy needed to heat the air there. It is no longer necessary that heated air passes through the environment in the air dryer. In the entire process of drying the web, of course, an additional air supply is required. However, this can be ensured via the radiation dryer. If it is a gas-powered radiation dryer, then this radiation dryer needs a combustion air. If it is an electrically powered radiation dryer, then this dryer requires cooling air. As a radiation dryer is preferably an infrared dryer into consideration.

Es ist von Vorteil, wenn in beiden Luftführungssystemen unterschiedliche Temperaturen und/oder Beladungen einstellbar sind. Dann lassen sich in beiden Trocknern oder Trockner-Abschnitten jeweils Bedingungen einstellen, die sich einem Optimum nähern.It is advantageous if different temperatures and / or loads can be set in both air guidance systems. Then conditions can be set in both driers or dryer sections which approach an optimum.

Vorzugsweise ist in jeder Verbindung jeweils eine Fördereinrichtung angeordnet. Die Fördereinrichtungen müssen lediglich den jeweiligen Strom innerhalb des jeweiligen Luftführungssystems erzeugen. Sie können daher vergleichsweise schwach ausgebildet sein, d.h. eine niedrige Druckstufe bzw. eine niedrige Fördermenge aufweisen. Dies macht die Materialbahntrockneranordnung in der Herstellung und im Betrieb kostengünstig, obwohl man zwei Fördereinrichtungen verwendet.Preferably, a conveyor is arranged in each connection. The conveyors only have to generate the respective current within the respective air guidance system. They can therefore be made comparatively weak, i. have a low pressure level and a low flow rate. This makes the web dryer assembly inexpensive to manufacture and in operation, although two conveyors are used.

Hierbei ist bevorzugt, dass beide Fördereinrichtungen unabhängig voneinander steuerbar sind. Man kann daher den Luftstrom im ersten Luftführungssystem anders steuern als im zweiten Luftführungssystem.It is preferred that both conveyors are independently controllable. One can therefore control the air flow in the first air duct system differently than in the second air duct system.

Bevorzugterweise ist im zweiten Luftführungssystem in der Verbindung von Abluft und Zuluft ein erster Frischluftanschluss vorgesehen. Man kann also beispielsweise so vorgehen, dass man beim Strahlungstrockner nur einen geringen Teil der Abluft, beispielsweise 20 %, wieder zur Zuluft zurückfördert und diesen Teil soweit mit Frischluft versetzt, dass er auf einen Wert in der Größenordnung von 120 bis 140°C abkühlt. Auf diese Weise kann bei einer Papierbahn die Gefahr des Mottlings reduziert und das Auskondensieren von Wasser auf der kalten Bahn vermieden werden.Preferably, a first fresh air connection is provided in the second air duct system in the connection of exhaust air and supply air. So you can for example proceed in such a way that only a small part of the exhaust air, For example, 20%, promotes back to the supply air and this part so far mixed with fresh air that it cools to a value in the order of 120 to 140 ° C. In this way, the danger of mottling can be reduced in a paper web and the condensation of water on the cold web can be avoided.

Auch ist von Vorteil, wenn im ersten Luftführungssystem in der Verbindung von Abluft und Zuluft eine Heizeinrichtung vorgesehen ist. Diese Heizeinrichtung erwärmt die Luft, die durch den Lufttrockner ausgestoßen wird, um die Bahn zu trocknen, dann, wenn der Strahlungstrockner mit seiner Abluft nicht genügend Wärme zur Verfügung steht.It is also advantageous if a heating device is provided in the first air duct system in the connection of exhaust air and supply air. This heater heats the air expelled through the air dryer to dry the web, when the radiant dryer with its exhaust air does not have enough heat available.

Hierbei ist bevorzugt, wenn im ersten Luftführungssystem in der Verbindung von Abluft und Zuluft ein zweiter Frischluftanschluss vorgesehen ist. Normalerweise sollte dieser Frischluftanschluss geschlossen sein, beispielsweise durch eine Klappe. Wenn die Heizeinrichtung vorhanden ist, dann kann der zweite Frischluftanschluss zum Spülen sinnvoll sein.In this case, it is preferred if a second fresh air connection is provided in the first air guidance system in the connection of exhaust air and supply air. Normally, this fresh air connection should be closed, for example by a flap. If the heater is present, then the second fresh air connection may be useful for rinsing.

Vorzugsweise ist im ersten Luftführungssystem zwischen dem Lufttrockner und der Verbindung der Abluft beider Luftführungssysteme ein steuerbarer Abluftauslass angeordnet. Die Abluft des Lufttrockners stellt den Punkt der Materialbahntrockneranordnung dar, an dem die Trocknungsluft am Kältesten ist, ohne dass Frischluft zugeführt wurde, und die Beladung mit Wasserdampf am Höchsten ist. Daher ist es energetisch hier sinnvoll, die Abluft an dieser Stelle abzuziehen. Auch dies steigert den Wirkungsgrad.Preferably, a controllable exhaust air outlet is arranged in the first air duct between the air dryer and the connection of the exhaust air of both air ducts. The exhaust air from the air dryer represents the point of the web dryer arrangement where the drying air is at its coldest, with no fresh air supplied, and the highest water vapor loading. Therefore, it is energetically useful here to deduct the exhaust air at this point. This also increases the efficiency.

Vorzugsweise weist der Abluftauslass eine Fördereinrichtung auf. Die Fördereinrichtung kann verwendet werden, um den Abluftauslass zu steuern. Wenn die Fördereinrichtung mit hoher Leistung betrieben wird, gelangt mehr Abluft nach außen als wenn die Fördereinrichtung mit einer kleinen Leistung betrieben wird.Preferably, the exhaust outlet on a conveyor. The conveyor may be used to control the exhaust outlet. When the conveyor is operated at high power, more exhaust air is released to the outside than when the conveyor is operated at a low power.

Hierbei ist bevorzugt, dass die Fördereinrichtung im Abluftauslass eine geringere Druckleistung aufweist als die Fördereinrichtung in den Verbindungen der beiden Luftführungssysteme. Dies hält die Kosten niedrig.In this case, it is preferred that the conveying device in the exhaust air outlet has a lower pressure output than the conveying device in the connections of the two air guiding systems. This keeps costs low.

Vorzugsweise ist im ersten Luftführungssystem und/oder im zweiten Luftführungssystem jeweils eine Abschottklappe angeordnet. Wenn man die Abschottklappe schließt, dann wird eine Zirkulation durch das jeweilige Luftführungssystem unterbunden oder zumindest stark gedrosselt. Diese Ausgestaltung hat insbesondere bei Strahlungstrocknern Vorteile, die als gasbetriebene IR-Trockner ausgebildet sind. Durch die Abschottklappe wird das Nachstarten derartiger Strahlungstrockner nicht von der Umluft gestört.Preferably, in each case a Abschottklappe is arranged in the first air duct system and / or in the second air duct system. If you close the Abschottklappe, then a circulation is prevented by the respective air duct system or at least greatly throttled. This embodiment has advantages, in particular in the case of radiation dryers, which are designed as gas-operated IR dryers. The Abschottklappe the restarting of such radiation dryer is not disturbed by the circulating air.

Auch ist von Vorteil, wenn die Abluft des Strahlungstrockners zur Beheizung des Lufttrockners geführt ist. In diesem Fall ergibt sich eine gute Energieausbeute.It is also advantageous if the exhaust air of the radiation dryer is led to the heating of the air dryer. In this case results in a good energy yield.

Die Erfindung wird im Folgenden anhand eines bevorzugten Ausführungsbeispiels in Verbindung mit einer Zeichnung beschrieben. Hierin zeigt die

einzige Figur
eine schematische Darstellung einer Materialbahntrockneranordnung.
The invention will be described below with reference to a preferred embodiment in conjunction with a drawing. Herein shows the
only figure
a schematic representation of a web dryer arrangement.

Eine Materialbahntrockneranordnung 1 dient zum Trocknen einer Materialbahn 2, die in einer durch einen Pfeil 3 gekennzeichneten Richtung an der Materialbahntrockneranordnung 1 vorbeiläuft.A material web dryer arrangement 1 serves to dry a material web 2, which passes by the material web dryer arrangement 1 in a direction indicated by an arrow 3.

In Laufrichtung passiert die Materialbahn 2 zunächst einen Strahlungstrockner 4, der als Infrarot-Trockner ausgebildet ist und danach einen Lufttrockner 5.In the running direction, the material web 2 first passes through a radiation dryer 4, which is designed as an infrared dryer and then an air dryer. 5

Dem Strahlungstrockner 4 wird über einen Einlass 6 Luft zugeführt, die je nach Ausbildung des Strahlungstrockners 4 als Verbrennungsluft (bei einem gasbetriebenen Infrarot-Trockner) oder als Kühlluft (bei einem elektrisch betriebenen Infrarot-Trockner) ausgebildet ist. Hierbei treibt ein Motor 7 einen Lüfter 8 an. Der Strahlungstrockner 4 gibt einerseits Strahlungswärme an die Materialbahn 2 ab, andererseits erwärmt er die eingetragene Luft. Erwärmte Luft wird zusammen mit dem verdunsteten Wasser aus der Materialbahn und - bei gasbeheizten Infrarotstrahlern - den Verbrennungsabgasen als Abluft 9 entnommen. Die Abluft 9 ist natürlich in einer Leitung oder einer Leitungsanordnung geführt. Ein Teil der Abluft 9, beispielsweise 15 bis 30 %, insbesondere etwa 20 %, wird über eine Verbindung 10 einer Zuluft 11 zugeführt. In der Verbindung 10 ist ein Frischluftanschluss 12 vorgesehen. Eine einen Motor 13 und ein Gebläse 14 aufweisende Fördereinrichtung fördert die Zuluft 11 in den Strahlungstrockner 4. Über die Beimischung der Luft aus dem Frischluftanschluss 12 wird diese Zuluft 11 auf etwa 120 bis 140°C abgekühlt. Auf diese Weise kann bei einer Papierbahn die Gefahr des Mottlings reduziert und allgemein bei einer Materialbahn 2 das Auskondensieren von Wasser auf der Materialbahn 2 verhindert werden. Das Gebläse 14 kann hier relativ klein ausgebildet sein und eine relativ niedrige Druckstufe von beispielsweise etwa 30 mbar aufweisen. Bei herkömmlichen Systemen hat man 50 mbar oder mehr benötigt. Der Motor 13 ist durch eine nicht näher dargestellte Steuereinrichtung steuerbar, insbesondere in Abhängigkeit von der Temperatur der Zuluft 11.The radiation dryer 4 is supplied via an inlet 6 air, which is formed depending on the design of the radiation dryer 4 as combustion air (in a gas-powered infrared dryer) or as cooling air (in an electrically operated infrared dryer). In this case, a motor 7 drives a fan 8. Of the Radiation dryer 4 is on the one hand radiant heat to the web 2 from, on the other hand, it heats the registered air. Heated air is removed together with the evaporated water from the material web and - in the case of gas-heated infrared radiators - the combustion exhaust gases as exhaust air 9. Of course, the exhaust air 9 is guided in a line or a line arrangement. A portion of the exhaust air 9, for example 15 to 30%, in particular about 20%, is supplied via a connection 10 to a supply air 11. In the connection 10, a fresh air connection 12 is provided. A conveying device comprising a motor 13 and a fan 14 conveys the supply air 11 into the radiation dryer 4. Via the admixture of the air from the fresh air connection 12, this supply air 11 is cooled to approximately 120 to 140 ° C. In this way, in the case of a paper web, the danger of mottling can be reduced and, in general, in the case of a material web 2, the condensation of water on the material web 2 can be prevented. The blower 14 may be made relatively small and have a relatively low pressure level of, for example, about 30 mbar. Conventional systems have required 50 mbar or more. The motor 13 is controllable by a control device, not shown, in particular depending on the temperature of the supply air eleventh

In der Verbindung 10 ist eine Abschottklappe 15 vorgesehen. Die Abschottklappe 15 ist normalerweise offen. Sie wird beispielsweise dann geschlossen, wenn im Strahlungstrockner 4 einzelne IR-Module nachgestartet werden müssen und nicht von der Umluft gestört werden sollen.In the connection 10 a Abschottklappe 15 is provided. The Abschottklappe 15 is normally open. It is closed, for example, when 4 individual IR modules have to be restarted in the radiation dryer and should not be disturbed by the circulating air.

Der Lufttrockner 5 weist eine Zuluft 16 und eine Abluft 17 auf. Wie im Zusammenhang mit dem Strahlungstrockner 4 bereits erwähnt, sind natürlich sämtliche Luftströme in Leitungen oder Leitungsanordnungen geführt.The air dryer 5 has a supply air 16 and an exhaust air 17. As already mentioned in connection with the radiation dryer 4, of course, all air flows are routed in lines or line arrangements.

Zwischen der Abluft 17 und der Zuluft 16 ist eine Verbindung 18 angeordnet. In der Verbindung 18 ist eine einen Motor 19 und ein Gebläse 20 aufweisende Fördereinrichtung angeordnet. Ferner ist in der Verbindung eine Abschottklappe 21 angeordnet. Schließlich kann optional in der Verbindung 18 noch eine Heizeinrichtung 22 angeordnet sein. Die Heizeinrichtung 22 kann beispielsweise als Brennkammer ausgebildet sein. Wenn in der Verbindung 18 oder in der Zuluft 16 eine derartige Heizeinrichtung 22 angeordnet ist, dann ist es zweckmäßig, einen Frischluftanschluss 23 vorzusehen, der, genau wie der Frischluftanschluss 12, steuerbar ausgebildet ist. Dieser Frischluftanschluss 23 dient gegebenenfalls zum Spülen des Kreislaufs durch den Lufttrockner 5.Between the exhaust air 17 and the supply air 16, a compound 18 is arranged. In the connection 18, a conveyor 19 having a motor 19 and a fan 20 is arranged. Further, a Abschottklappe 21 is arranged in the connection. Finally, optionally in the connection 18, a heating device 22 may be arranged. The heater 22 may, for example, as a combustion chamber be educated. If such a heating device 22 is arranged in the connection 18 or in the supply air 16, then it is expedient to provide a fresh air connection 23 which, just like the fresh air connection 12, is designed to be controllable. If necessary, this fresh air connection 23 serves to rinse the circuit through the air dryer 5.

Der Lufttrockner 5 weist also ein erstes Luftführungssystem 24 und der Strahlungstrockner 4 weist ein zweites Luftführungssystem 25 auf. Beide Luftführungssysteme weisen eine Verbindung 18, 10 von Zuluft 16, 11 und Abluft 17, 9 auf. Beide Luftführungssysteme 24, 25 sind im Bereich ihrer Abluft 17, 9 miteinander verbunden, d.h. es existiert eine Verbindung 26, wo die die Abluft 17, 9 führenden Leitungen zusammentreffen.The air dryer 5 thus has a first air guidance system 24 and the radiation dryer 4 has a second air guidance system 25. Both air guide systems have a connection 18, 10 of supply air 16, 11 and exhaust air 17, 9. Both air guide systems 24, 25 are connected to each other in the region of their exhaust air 17, 9, i. There is a connection 26 where the exhaust air 17, 9 leading lines meet.

In der Abluft 17 des ersten Luftführungssystems 24, d.h. zwischen dem Lufttrockner 5 und der Verbindung 26 ist ein Abluftauslass 27 angeordnet, der eine einen Motor 28 und ein Gebläse 29 aufweisende Fördereinrichtung aufweist. Diese Fördereinrichtung weist eine noch niedrigere Förderleistung als die beiden anderen Fördereinrichtungen 13, 14 bzw. 19, 20 auf. Es reicht hier beispielsweise eine Druckstufe von nur 20 mbar aus. Der Abluftauslass 27 ist im ersten Luftführungssystem 24 dort angeordnet, wo die Trocknungsluft am kältesten ist (wenn man von der Zuluft 11 des Infrarot-Trockners, der aus Qualitätsgründen nur mit Frischluft versetzt wird, absieht) und die höchste Beladung mit Feuchtigkeit aufweist. Die beladene Abluft wird am Abluftauslass 27 mit den geringsten energetischen Verlusten abgezogen.In the exhaust air 17 of the first air duct system 24, i. between the air dryer 5 and the connection 26, an exhaust outlet 27 is arranged, which has a motor 28 and a fan 29 having conveyor. This conveyor has an even lower capacity than the other two conveyors 13, 14 and 19, 20. For example, a pressure rating of only 20 mbar is sufficient here. The exhaust outlet 27 is arranged in the first air duct system 24 where the drying air is coldest (apart from the supply air 11 of the infrared dryer, which is only mixed with fresh air for quality reasons) and has the highest moisture content. The laden exhaust air is withdrawn at the exhaust outlet 27 with the least energy losses.

Die Materialbahntrockneranordnung 1 arbeitet wie folgt: ein geringer Teil, beispielsweise 20 %, der Abluft 9 des Strahlungstrockners wird mit Frischluft versetzt und dadurch auf etwa 120 bis 140°C abgekühlt und dem Strahlungstrockner 4 wieder als Zuluft oder Blasluft zugeführt. Der größte Teil der Abluft 9 des Strahlungstrockners 4 wird in das Luftführungssystem 24 des Lufttrockners 5 eingespeist. In vielen Fällen wird die hierdurch eingetragene Wärmeenergie bereits ausreichen, um den Lufttrockner 5 betreiben zu können. Wenn dies nicht der Fall ist, kann über die Heizeinrichtung 22 zusätzliche Wärme eingetragen werden. Da sich die Luft im Lufttrockner 5 mit Feuchtigkeit belädt, wird ein Teil dieser Luft über den Abluftauslass 27 entfernt. Im Strahlungstrockner 4 ist hingegen die Gefahr einer zu hohen Beladung mit Feuchtigkeit relativ gering, weil hier fortlaufend Frischluft über den Einlass 6 und über den Frischluftanschluss 12 zugeführt wird.The web dryer arrangement 1 operates as follows: a small portion, for example 20%, of the exhaust air 9 of the radiation dryer is mixed with fresh air and thereby cooled to about 120 to 140 ° C and fed back to the radiation dryer 4 as supply air or blowing air. The largest part of the exhaust air 9 of the radiation dryer 4 is fed into the air duct system 24 of the air dryer 5. In many cases, the heat energy introduced by this will already be sufficient to operate the air dryer 5 can. If this is not the case, additional heat can be entered via the heating device 22. As the air in the Air dryer 5 loaded with moisture, a portion of this air is removed via the exhaust outlet 27. In the radiation dryer 4, on the other hand, the danger of too high a loading of moisture is relatively low, because here fresh air is continuously supplied via the inlet 6 and via the fresh air connection 12.

Claims (12)

  1. Material web drying arrangement having at least one radiation dryer and at least one air dryer, the air dryer having a first air guidance system with supply air and exhaust air, the radiation dryer (4) having a second air guidance system (25), characterized in that the two air guidance systems (24, 25) each have a link (18, 10) between supply air (16, 11) and exhaust air (17, 9), and the two air guidance systems (24, 25) are linked to each other only in the region of their respective exhaust air (17, 9).
  2. Material web drying arrangement according to Claim 1, characterized in that different temperatures and/or loadings can be set in the two air guidance systems (24, 25).
  3. Material web drying arrangement according to Claim 1 or 2, characterized in that a delivery device (19, 20; 13, 14) is in each case arranged in each link (18, 10).
  4. Material web drying arrangement according to Claim 3, characterized in that the two delivery devices (19, 20; 13, 14) can be controlled independently of each other.
  5. Material web drying arrangement according to one of Claims 1 to 4, characterized in that a first fresh air connection (12) is provided in the link (10) between exhaust air (9) and supply air (11) in the second air guidance system (25).
  6. Material web drying arrangement according to one of Claims 1 to 5, characterized in that a heating device (22) is provided in the link (18) between exhaust air (17) and supply air (16) in the first air guidance system (24).
  7. Material web drying arrangement according to Claim 6, characterized in that a second fresh air connection (23) is provided in the link (18) between exhaust air (17) and supply air (16) in the first air guidance system (24).
  8. Material web drying arrangement according to one of Claims 1 to 7, characterized in that, in the first air guidance system (24), a controllable exhaust air outlet (27) is arranged between the air dryer (5) and the link (26) between the exhaust air (17, 9) of the two air guidance systems (24, 25).
  9. Material web drying arrangement according to Claim 8, characterized in that the exhaust air outlet (27) has a delivery device (28, 29).
  10. Material web drying arrangement according to Claim 9, characterized in that the delivery device (28, 29) in the exhaust air outlet (27) has a lower delivery output than the delivery devices (19, 20; 13, 14) in the two links (18, 10) of the two air guidance systems (24, 25).
  11. Material web drying arrangement according to one of Claims 1 to 10, characterized in that in each case a shut-off valve (21, 15) is arranged in the first air guidance system (24) and/or in the second air guidance system (25).
  12. Material web drying arrangement according to one of Claims 1 to 11, characterized in that the exhaust air (9) from the radiation dryer (4) is led to the heating of the air dryer (5).
EP08105677A 2007-10-31 2008-10-28 Web of material drying arrangement Not-in-force EP2056053B1 (en)

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EP4089354A1 (en) 2021-05-11 2022-11-16 Trützschler Group SE Device and method for drying a textile sheet-like material

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DE102008042247A1 (en) * 2008-09-22 2010-04-01 Voith Patent Gmbh Web dryer arrangement
DE102008042248A1 (en) 2008-09-22 2010-04-01 Voith Patent Gmbh Web dryer arrangement
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4089354A1 (en) 2021-05-11 2022-11-16 Trützschler Group SE Device and method for drying a textile sheet-like material
DE102021112295A1 (en) 2021-05-11 2022-11-17 Trützschler Group SE Device and method for drying a textile web

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DE102007051962A1 (en) 2009-05-07
EP2056053A2 (en) 2009-05-06

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