EP1869386B1 - Multistage continuous dryer, especially for plate-shaped products - Google Patents

Multistage continuous dryer, especially for plate-shaped products Download PDF

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Publication number
EP1869386B1
EP1869386B1 EP06722779A EP06722779A EP1869386B1 EP 1869386 B1 EP1869386 B1 EP 1869386B1 EP 06722779 A EP06722779 A EP 06722779A EP 06722779 A EP06722779 A EP 06722779A EP 1869386 B1 EP1869386 B1 EP 1869386B1
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Prior art keywords
dryer
drying air
chamber
air
zone
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EP06722779A
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German (de)
French (fr)
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EP1869386A1 (en
Inventor
Alfred Dotzler
Anton Hecht
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Lindauer Dornier GmbH
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Lindauer Dornier GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
    • F26B15/18—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by endless belts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure

Definitions

  • the invention relates to a continuous dryer in Mehretagenbauweise for particular plate-shaped products, with means, especially rollers or belt-like means for transporting the products within the continuous dryer, the continuous dryer has several in the transport direction of the products arranged one behind the other and a housing having dryer zones in which drying air in the Convection method forcibly circulated, each dryer zone has at least one central heat source and a plurality of vertically arranged in a fan stand axial fan, which axial fan directly promote the drying air in inflow preferably in pairs above and below the transport of each floor arranged nozzle boxes for blowing the products and sucked with moisture drying air over the at least one heat source again.
  • a multi-tray dryer for strip or plate-shaped goods which consists of a number of juxtaposed dryer zones.
  • An essential distinguishing feature between the multi-ply dryers mentioned in the prior art and the multi-ply dryers disclosed in the DE document is that instead of a plurality of axial fans as suction and pressure means for the drying air, a radial fan is provided in the respective dryer zones for supplying all the dryer floors.
  • the US 3,070,902 describes the improvement of the roll transport system in a dryer by means of air cushion tables.
  • the US 3,374,106 describes a device for the gentle drying of an air-permeable product (nonwoven fabric) via adjustable baffles on nozzles. In this case, a sprayed binder with increased performance of the dryer is dried.
  • the present invention seeks to provide a continuous dryer, especially in Mehretagenbauweise, in which maintaining the known per se Axiallshareeran Aunt per dryer zone a significant improvement ofDrozeßluft-leadership and a uniform residual moisture in the products End of the drying process is given.
  • a further object is to improve the service life of the dryer by allowing the drying air laden with moisture and optionally with product articles to be cleaned before re-heating.
  • the first object is achieved by the features of claim 1.
  • the first space is separated from the second space by a false ceiling and closed by insulating bulkheads opposite the adjacent first space of the adjacent dryer zones.
  • the drying air laden with drying air is taken up by at least two pairs of the nozzle boxes per floor and passed over the existing in the false ceiling discharge opening in the first room.
  • a predeterminable small proportion of the backflowing air quantity can be discharged via corresponding suction openings in the wall of the dryer zone and / or via suction in the enclosure of the first room as exhaust air, while the remaining larger proportion of the backflowing air directly or via a filter device of the first Room arranged heat source is brought back to the process temperature.
  • the regenerated drying air is directionally sucked via the both sides of the fan stand vertically extending channels of the axial fans and fed again to the inflow opening of the nozzle boxes. It should be mentioned at this point that the proportion of moisture laden drying air derived as exhaust air can be compensated by introducing preheated fresh drying air from energy recovery devices into the first space.
  • FIGS. 1 and 2 show three modularly mounted dryer zones 1 one consisting of a plurality of such dryer zones continuous dryer.
  • a housing 1a and a false ceiling 2 separate the dryer zone 1 into two vertically stacked rooms 3, 4.
  • the room 3 contains a central heat source 5, which in the present case may be a gas or oil burner.
  • transport means in the manner of guided on rollers 6 screen belts 7 are shown on eight floors, carrying the product to be dried 8.
  • Below and above the respective screen belt 7 pairs of nozzle boxes 9 are positioned.
  • Each rocker zone 1 has a fan stand 10 which carries a plurality of axial fans 11 arranged vertically one above the other.
  • the axial fans 11 form a suction region 11a and a pressure region 11b.
  • the dryer zones (1) are mounted in counter-construction to each other.
  • a suction channel 12 extending over all the floors of the dryer zone 1 is provided, which connects the first space 3 with the suction area 11a of the respective axial fans 11 via a defined inflow opening 12a.
  • the pressure region 11 b of the axial fan 11 is formed, in which pressure region 11 b the inflow openings 9 a of the nozzle boxes 9 open, as in FIGS Figures 2 and 3 can be seen.
  • the air duct 13 which is open to the nozzle boxes 9 out, laden with moisture drying air flows from the individual floors of the respective dryer zone. 1
  • the duct 13 in turn, which extends vertically over all floors of the respective dryer zone 1, opens into the first space 3, in which the moist air flowing back is regenerated.
  • regeneration is meant, for example, the filtering of the drying air in order to remove any product dust or particles from the drying air.
  • Regeneration also means a renewed heating by means of the heat source 5 of the drying air flowing back from the drying process.
  • a filter 14 integrated in the first space 3 ensures the cleaning of the drying air.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention relates to a dryer, especially multi-level throughflow dryer for preferably plate-shaped products. The invention essentially aims to achieve a considerable improvement of the drying air guidance and a uniform residual moisture in all products (8) at the end of the drying process, while maintaining the per se known axial blower arrangement, per each dryer zone (1).

Description

Die Erfindung betrifft einen Durchlauftrockner in Mehretagenbauweise für insbesondere plattenförmige Produkte, mit Mitteln, insbesondere Rollen oder bandartige Mittel, zum Transport der Produkte innerhalb des Durchlauftrockners, wobei der Durchlauftrockner mehrere in Transportrichtung der Produkte hintereinander angeordnete und eine Umhausung aufweisende Trocknerzonen besitzt, in denen Trocknungsluft im Umluftverfahren zwangsweise zirkuliert, wobei jede Trocknerzone wenigstens eine zentrale Wärmequelle und mehrere in einem Lüfterständer vertikal übereinander angeordnete Axiallüfter besitzt, welche Axiallüfter die Trocknungsluft auf direktem Wege in Zuströmöffnungen von bevorzugt paarweise über und unter dem Transportmittel der jeweiligen Etage angeordneten Düsenkästen zum Beblasen der Produkte fördern und mit Feuchte beladene Trocknungsluft über die wenigstens eine Wärmequelle wieder ansaugen.The invention relates to a continuous dryer in Mehretagenbauweise for particular plate-shaped products, with means, especially rollers or belt-like means for transporting the products within the continuous dryer, the continuous dryer has several in the transport direction of the products arranged one behind the other and a housing having dryer zones in which drying air in the Convection method forcibly circulated, each dryer zone has at least one central heat source and a plurality of vertically arranged in a fan stand axial fan, which axial fan directly promote the drying air in inflow preferably in pairs above and below the transport of each floor arranged nozzle boxes for blowing the products and sucked with moisture drying air over the at least one heat source again.

Durchlauftrockner in Mehretagenbauweise mit den vorgenannten Merkmalen sind seit Langem bekannt; siehe auch " Die richtige Lösung für die Bauptatten-tndustne", Prospekt der Lindauer DORNIER GmbH, Seite 6/7. Impressum 12/01/LD/02/99 .
Die von den Lüftern angesaugte Trocknungsluft besitzt über die Höhe des Durchlauftrockners, d.h. über die einzelnen Etagen, bezüglich der Temperatur und der Feuchtigkeit der Trocknungsluft voneinander abweichende Zustände. Folglich werden die in den jeweiligen Etagen des Durchlauftrockners zu trocknenden Produkte mit einer Trocknungsluft beblasen, die verschiedene Energiezustände aufweist. Dabei hat sich als Nachteil des bekannten Durchlauftrockners herausgestellt, dass die den Durchlauftrockner am Ende des Trocknungsprozesses verlassenden Produkte eine vergleichsweise unterschiedliche Restfeuchte aufweisen.
Durch Maßnahmen zur differenzierten Verteilung der Leistung der Wärmequelle über die Höhe, d.h. über alle Etagen des Durchlauftrockners und durch zusätzliche, dem Führen der Trocknungsluft dienende Einbauten, kann eine relativ gleichmäßige Temperatur der Trocknungsluft in den Etagen erreicht und der Feuchteanteil in der regenerierten Trocknungsluft korrigiert oder vergleichmäßigt werden. Diese Maßnahmen sind aber mit erheblichen Kostenaufwendungen verbunden.Continuous dryers in Mehretagenbauweise with the aforementioned features have long been known; see also " The right solution for the Bauptatten-tndustne ", prospectus of Lindauer DORNIER GmbH, page 6/7 Imprint 12/01 / LD / 02/99 ,
The sucked by the fans drying air has over the height of the continuous dryer, ie on the individual floors, with respect to the temperature and the humidity of the drying air divergent states. Consequently, the products to be dried in the respective levels of the continuous dryer are blown with a drying air having different energy states. It has been found to be a disadvantage of the known continuous dryer that the flow dryer at the end of the drying process leaving products have a relatively different residual moisture.
By measures for the differentiated distribution of the power of the heat source over the height, ie over all floors of the continuous dryer and by additional, guiding the drying air used internals, a relatively uniform temperature of the drying air can be achieved in the floors and the moisture content in the regenerated drying air corrected or be evened out. However, these measures are associated with considerable cost expenditures.

Aus DE 197 01 426 C2 ist ein Mehretagentrockner für band- oder plattenförmiges Gut bekannt, der aus einer Anzahl aneinandergereihter Trocknerzonen besteht.Out DE 197 01 426 C2 For example, a multi-tray dryer for strip or plate-shaped goods is known, which consists of a number of juxtaposed dryer zones.

Ein wesentliches Unterscheidungsmerkmal zwischen den im Stand der Technik erwähnten Mehretagentrockner und den in dem DE-Dokument offenbarten Mehretagentrockner besteht darin, dass in den betreffenden Trocknerzonen anstelle mehrerer Axiallüfter als Saug- und Druckmittel für die Trocknungsluft ein Radiallüfter zur Versorgung sämtlicher Trockneretagen vorgesehen ist.An essential distinguishing feature between the multi-ply dryers mentioned in the prior art and the multi-ply dryers disclosed in the DE document is that instead of a plurality of axial fans as suction and pressure means for the drying air, a radial fan is provided in the respective dryer zones for supplying all the dryer floors.

Aus dem Trocknerbau ist allgemein bekannt, dass zur Umwälzung gleicher Volumina an Trocknungsluft und bei gleichen Systemwiderständen der Radiallüfter einen wesentlich höheren Energieeinsatz erfordert, als die Verwendung mehrerer vertikal übereinander angeordneter Axiallüfter. Unter Systemwiderständen sollen u.a. Einbauten in der Trocknerzone verstanden werden, die dem Trocknungsluft-Strom entgegenwirken bzw. für den Trocknungsluftstrom einen Strömungswiderstand bilden.
Bekannt ist in diesem Zusammenhang auch, dass Axiallüfter eine vergleichsweise bessere Führung der Trocknungsluft zu und weg von den zu trocknenden Produkten ermöglichen, weil sich z.B. die Zuströmöffnungen der Düsenkästen in einem relativ geringen Abstand von dem Druckbereich der Axiallüfter befinden.From the dryer is generally known that the circulation of equal volumes of drying air and the same system resistances of the radial fan requires a much higher energy input than the use of multiple vertically stacked axial fan. Amongst other things, system resistors should be understood to be internals in the dryer zone which counteract the drying air flow or form a flow resistance for the drying air flow.
It is also known in this context that axial fans allow a comparatively better guidance of the drying air to and from the products to be dried, because, for example, the inflow openings of the nozzle boxes are located at a relatively small distance from the pressure range of the axial fans.

Die US 3 070 902 beschreibt die Verbesserung des Rollentransportsystems in einem Trockner mittels Luftkissentischen.The US 3,070,902 describes the improvement of the roll transport system in a dryer by means of air cushion tables.

Die US 3 374 106 beschreibt eine Vorrichtung für die schonende Trocknung eines luftdurchlässigen Produktes (Vliesstoff) über verstellbare Leitbleche an Düsen. Dabei wird ein aufgesprühtes Bindemittel mit erhöhter Leistungsfähigkeit des Trockners getrocknet.The US 3,374,106 describes a device for the gentle drying of an air-permeable product (nonwoven fabric) via adjustable baffles on nozzles. In this case, a sprayed binder with increased performance of the dryer is dried.

Ausgehend von den zum Stand der Technik bekannten Nachteilen liegt der Erfindung die Aufgabe zugrunde, einen Durchlauftrockner, insbesondere in Mehretagenbauweise zu schaffen, in dem unter Beibehaltung der an sich bekannten Axiallüfteranordnung je Trocknerzone eine deutliche Verbesserung derTrocknungsluft-Führung und eine gleichmäßige Restfeuchte in den Produkten am Ende des Trocknungsprozesses gegeben ist.
Eine weitere Aufgabe besteht darin, die Betriebsdauer des Trockners dadurch zu verbessern, dass die mit Feuchte und gegebenenfalls mit Produktartikeln beladene Trocknungsluft vor ihrem erneuten Aufheizen gereinigt werden kann.Based on the known prior art disadvantages, the present invention seeks to provide a continuous dryer, especially in Mehretagenbauweise, in which maintaining the known per se Axiallüfteranordnung per dryer zone a significant improvement ofDrozeßluft-leadership and a uniform residual moisture in the products End of the drying process is given.
A further object is to improve the service life of the dryer by allowing the drying air laden with moisture and optionally with product articles to be cleaned before re-heating.

Die erste Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst.The first object is achieved by the features of claim 1.

Die zweite Aufgabe wird erfindungsgemäß durch die Merkmale des abhängigen Patentanspruchs 9 gelöst.The second object is achieved by the features of the dependent patent claim 9.

Nach den Merkmalen des Patentanspruchs 1 ist vorgesehen,

  • dass die Umhausung jeder Trocknerzone des Mehretagen-Durchlauftrockners einen mit einer Wärmequelle ausgestatteten, ersten Raum zur Regenerierung der aus dem Produkt-Trocknungsprozess zurückgeführten Trocknungsluft umschließt, welcher Raum vertikal über einen die Etagen der Trocknerzone beinhaltenden zweiten Raum ausgebildet und angeordnet ist,
  • dass seitlich neben jedem Lüfterständer, der vertikal übereinander angeordnete Axiallüfter trägt, jeweils ein sich über alle Etagen der Trocknerzone erstreckender, Saugkanal vorgesehen ist, der über eine definierte Zuströmöffnung für regenerierte Trocknungsluft den ersten Raum mit dem Saugbereich der jeweiligen Axiallüfter verbindet und
  • dass die Saugkanäle beidseitig neben dem Lüfterständer vertikal verlaufen und Mittel zum richtungsorientierten Abströmen regenerierter Trocknungsluft bilden und
  • dass die dem Lüfterständer abgewandte Seite der Düsenkästen in einem sich über alle Etagen jeder Trocknerzone erstreckenden Luftschacht für mit Feuchte beladene Trocknungsluft endet, welcher Luftschacht in den ersten Raum mündet.
According to the features of claim 1 is provided
  • that the enclosure of each dryer zone of the multi-day continuous dryer, equipped with a heat source, first room for the regeneration of the Product drying process recirculated drying air encloses which space is formed and arranged vertically over a second floor containing the floors of the dryer zone,
  • that laterally next to each fan stand, which carries vertically superimposed axial fan, each extending over all floors of the dryer zone, suction channel is provided which connects the first space with the suction region of the respective axial fan via a defined inflow opening for regenerated drying air and
  • that the suction channels extend vertically on both sides next to the fan stand and form means for directionally directed outflow of regenerated drying air and
  • that the side facing away from the fan stand side of the nozzle boxes ends in an extending over all floors of each dryer zone duct for moisture-laden drying air, which duct opens into the first room.

Der erste Raum ist durch eine Zwischendecke von dem zweiten Raum getrennt und durch isolierende Schottwände gegenüber dem angrenzenden ersten Raum der benachbarten Trocknerzonen verschlossen.
In dem vorgenannten Luftschacht wird die mit Feuchte beladene Trocknungsluft von wenigstens zwei Paaren der Düsenkästen je Etage aufgenommen und über die in der Zwischendecke vorhandene Ausströmöffnung in den ersten Raum geleitet.
Ein vorbestimmbarer geringer Anteil der rückströmenden Luftmenge kann dabei über entsprechende Absaugöffnungen in der Wand der Trocknerzone und/oder über Absaugöffnungen in der Umhausung des ersten Raumes als Abluft abgeleitet werden, während der verbleibende größere Anteil der rückströmenden Luftmenge direkt oder über eine Filtereinrichtung von der im ersten Raum angeordneten Wärmequelle wieder auf die Prozesstemperatur gebracht wird. Nachfolgend wird die regenerierte Trocknungsluft richtungsorientiert über die beidseitig neben dem Lüfterständer vertikal verlaufenden Kanäle von den Axiallüftern angesaugt und erneut der Zuströmöffnung der Düsenkästen zugeführt.
An dieser Stelle sei noch erwähnt, dass der als Abluft abgeleitete Anteil Feuchte beladener Trocknungsluft durch Einleiten vorgeheizter frischer Trocknungsluft aus Energierückgewinnungsvorrichtungen in den ersten Raum kompensiert werden kann.The first space is separated from the second space by a false ceiling and closed by insulating bulkheads opposite the adjacent first space of the adjacent dryer zones.
In the aforementioned duct, the drying air laden with drying air is taken up by at least two pairs of the nozzle boxes per floor and passed over the existing in the false ceiling discharge opening in the first room.
A predeterminable small proportion of the backflowing air quantity can be discharged via corresponding suction openings in the wall of the dryer zone and / or via suction in the enclosure of the first room as exhaust air, while the remaining larger proportion of the backflowing air directly or via a filter device of the first Room arranged heat source is brought back to the process temperature. Subsequently, the regenerated drying air is directionally sucked via the both sides of the fan stand vertically extending channels of the axial fans and fed again to the inflow opening of the nozzle boxes.
It should be mentioned at this point that the proportion of moisture laden drying air derived as exhaust air can be compensated by introducing preheated fresh drying air from energy recovery devices into the first space.

Mit der erfindungsgemäßen Ausbildung der Trocknerzonen eines Mehretagen-Durchlauftrockners wird in vorteilhafter Weise eine gegenüber bekannten Trocknern dieser Art verbesserte Führung der Trocknungsluft und eine gleichmäßigere Temperatur der Trocknungsluft in allen Etagen der Trocknerzone erreicht. Die Qualität der den Trocknungsprozess durchlaufenen Produkte wird verbessert.With the construction according to the invention of the dryer zones of a multi-stage continuous dryer, an improved guidance of the drying air and a more uniform temperature of the drying air in all the floors of the dryer zone are achieved in an advantageous manner compared with known dryers of this type. The quality of the products undergoing the drying process is improved.

Durch den Einsatz eines Filters für rückströmende Trocknungsluft kann der Verschmutzung den einzelnen Trocknerzonen wirksam entgegengewirkt werden;
Stillstandszeiten zur Reinigung des aus einer Vielzahl von Trocknerzonen bestehenden Durchlauftrockners können sich dadurch reduzieren.By using a filter for backflowing drying air pollution of the individual dryer zones can be effectively counteracted;
Downtimes to clean the existing from a variety of dryer zones continuous dryer can thereby reduce.

Die Erfindung wird nachfolgend an einem Ausführungsbeispiel näher erläutert.The invention will be explained in more detail using an exemplary embodiment.

In den Zeichnungen zeigen:

Figur 1
die Vorderansicht in Schnittdarstellung von drei modulartig zusammengesetzten Trocknerzonen eines Durchlauftrockners in Mehretagenbauweise,
Figur 2
eine Ansicht "Z" der in Figur 1 dargestellten Trocknerzonen und
Figur 3
die Trocknerzone gemäß der Linie A-A in Figur 1.
In the drawings show:
FIG. 1
the front view in a sectional view of three modularly composed dryer zones of a continuous dryer in multi-day construction,
FIG. 2
a view "Z" of in FIG. 1 shown dryer zones and
FIG. 3
the drying zone according to the line AA in FIG. 1 ,

Die Figuren 1 und 2 zeigen drei modulartig montierte Trocknerzonen 1 eines aus einer Vielzahl derartiger Trocknerzonen bestehenden Durchlauftrockners. In jeder Trocknerzone 1 trennt eine Umhausung 1a und eine Zwischendecke 2 die Trocknerzone 1 in zwei vertikal übereinander angeordnete Räume 3, 4. Der Raum 3 beinhaltet eine zentrale Wärmequelle 5, die im vorliegenden Fall ein Gas- oder Ölbrenner sein kann.Im Raum 4, also in dem Raum unterhalb der Zwischendecke 2, sind auf acht Etagen Transportmittel in Art von auf Rollen 6 geführte Siebbänder 7 dargestellt, die das zu trocknende Produkt 8 tragen. Unter und über dem betreffenden Siebband 7 sind Paare von Düsenkästen 9 positioniert.
Jede rocknerzone 1 weist einen Lüfterständer 10 auf, der mehrere vertikal übereinander angeordnete Axiallüfter 11 trägt. Die Axiallüfter 11 bilden einen Saugbereich 11a und einen Druckbereich 11b aus.
In einer bevorzugten Ausführungsform werden die Trocknerzonen (1) in Konterbauweise zueinander montiert.
Seitlich neben dem Lüfterständer 10 ist jeweils ein sich über alle Etagen der Trocknerzone 1 erstreckender Saugkanal 12 vorgesehen, der über eine definierte Zuströmöffnung 12a den ersten Raum 3 mit dem Saugbereich 11a der jeweiligen Axiallüfter 11 verbindet.
Axial beabstandet vom Saugbereich 11 a ist der Druckbereich 11 b des Axiallüfters 11 ausgebildet, in welchem Druckbereich 11 b die Zuströmöffnungen 9a der Düsenkästen 9 münden, wie in den Figuren 2 und 3 zu erkennen ist.The FIGS. 1 and 2 show three modularly mounted dryer zones 1 one consisting of a plurality of such dryer zones continuous dryer. In each dryer zone 1, a housing 1a and a false ceiling 2 separate the dryer zone 1 into two vertically stacked rooms 3, 4. The room 3 contains a central heat source 5, which in the present case may be a gas or oil burner. Thus, in the space below the false ceiling 2, transport means in the manner of guided on rollers 6 screen belts 7 are shown on eight floors, carrying the product to be dried 8. Below and above the respective screen belt 7 pairs of nozzle boxes 9 are positioned.
Each rocker zone 1 has a fan stand 10 which carries a plurality of axial fans 11 arranged vertically one above the other. The axial fans 11 form a suction region 11a and a pressure region 11b.
In a preferred embodiment, the dryer zones (1) are mounted in counter-construction to each other.
On the side next to the fan stand 10, a suction channel 12 extending over all the floors of the dryer zone 1 is provided, which connects the first space 3 with the suction area 11a of the respective axial fans 11 via a defined inflow opening 12a.
Axially spaced from the suction region 11 a, the pressure region 11 b of the axial fan 11 is formed, in which pressure region 11 b the inflow openings 9 a of the nozzle boxes 9 open, as in FIGS Figures 2 and 3 can be seen.

Auf der dem Lüfterständer 10 jeder Trocknerzone 1 abgewandten Seite der Düsenkästen 9 ist ein Luftschacht 13 ausgebildet. In dem Luftschacht 13, der zu den Düsenkästen 9 hin offen ist, strömt mit Feuchte beladene Trocknungsluft aus den einzelnen Etagen der jeweiligen Trocknerzone 1.
Der Luftschacht 13 wiederum, der sich vertikal über alle Etagen der betreffenden Trocknerzone 1 erstreckt, mündet in dem ersten Raum 3, in dem die zurückströmende Feuchtluft regeneriert wird.
Unter Regenerierung ist hier z.B. die Filterung der Trocknungsluft zu verstehen, um eventuellen Produktstaub oder -partikel aus der Trocknungsluft zu entfernen. Regenerierung bedeutet auch ein erneutes Aufheizen mittels der Wärmequelle 5 der aus dem Trocknungsprozess zurückströmenden Trocknungsluft.
Ein in dem ersten Raum 3 integrierter Filter 14 sorgt für die Reinigung der Trocknungsluft.On the fan stand 10 each dryer zone 1 side facing away from the nozzle boxes 9, a duct 13 is formed. In the air duct 13, which is open to the nozzle boxes 9 out, laden with moisture drying air flows from the individual floors of the respective dryer zone. 1
The duct 13 in turn, which extends vertically over all floors of the respective dryer zone 1, opens into the first space 3, in which the moist air flowing back is regenerated.
By regeneration is meant, for example, the filtering of the drying air in order to remove any product dust or particles from the drying air. Regeneration also means a renewed heating by means of the heat source 5 of the drying air flowing back from the drying process.
A filter 14 integrated in the first space 3 ensures the cleaning of the drying air.

Claims (6)

  1. Dryer, especially multi-level throughflow dryer for preferably plate-shaped products (8), with means, especially rollers (6) or belt-shaped means (7) for the transport of the products within the dryer, whereby the dryer consists of several dryer zones (1) that comprise a housing (1 a) and that are arranged behind one another in the transport direction of the products, in which dryer zones drying air positively circulates in an air circulation method, whereby each dryer zone (1) has a central heat source (5) and several axial blowers (11) arranged vertically over one another in a blower stand (10), which axial blowers (11) convey the drying air on a direct path into inflow openings (9a) of nozzle boxes (9) arranged preferably pair-wise over and under the transport means of the respective level for the blowing against the products, and which again suck-in the moisture laden drying air, whereby vertically orientated chambers extending over all levels of the dryer zone (1) are provided on both sides next to the blower stand (10), which vertically orientated chambers are connected with the suction area (11 a) of the respective axial blowers (11),
    characterized in that the moisture laden drying air is again sucked over the at least one heat source (5), and in that the housing of each dryer zone (1) encloses a first chamber (3) for the regeneration of the drying air, which chamber (3) is equipped with the heat source (5), and which chamber (3) is embodied and arranged vertically above a second chamber (4) containing the levels of the dryer zone, whereby the side of the nozzle boxes (9) facing away from the blower stand (10) ends in an air shaft (13) for moisture laden drying air, and which air shaft (13) joins into the first chamber (3) for the regeneration of the moisture laden drying air, and whereby the vertically orientated chambers are embodied as suction channels (12), which connect the first chamber (3) with the suction area (11 a) of the respective axial blowers (11) through a defined inflow opening (12a) and as means for the directionally oriented outflowing of regenerated drying air.
  2. Dryer according to claim 1, characterized in that the first chamber (3) is separated from the second chamber (4) by an intermediate ceiling (2).
  3. Dryer according to claim 1, characterized in that the first chamber (3) formed from the housing (1 a) and the intermediate ceiling (2) is enclosed by insulated bulkhead partitions (1 b) relative to the adjoining first chamber (3) of the neighboring dryer zones.
  4. Dryer according to claim 1, characterized in that the air shaft (13) is embodied over the totality of the levels of the applicable dryer zone (1), and takes up the moisture laden drying air from at least two pairs of the nozzle boxes (9) per level.
  5. Dryer according to claim 1, characterized in that the dryer zones (1) are preferably installed in a counter construction relative to one another.
  6. Dryer according to claim 1, characterized in that a filter arrangement (14) is arranged in the first chamber (3) between the outlet of the at least one air shaft (13) and the heat source (5).
EP06722779A 2005-04-13 2006-04-11 Multistage continuous dryer, especially for plate-shaped products Not-in-force EP1869386B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005017187A DE102005017187B4 (en) 2005-04-13 2005-04-13 Continuous dryers in multi-day construction, especially for plate-shaped products
PCT/DE2006/000642 WO2006108398A1 (en) 2005-04-13 2006-04-11 Multistage continuous dryer, especially for plate-shaped products

Publications (2)

Publication Number Publication Date
EP1869386A1 EP1869386A1 (en) 2007-12-26
EP1869386B1 true EP1869386B1 (en) 2011-10-19

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EP06722779A Not-in-force EP1869386B1 (en) 2005-04-13 2006-04-11 Multistage continuous dryer, especially for plate-shaped products

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US (1) US20090038176A1 (en)
EP (1) EP1869386B1 (en)
CN (1) CN101175964A (en)
AT (1) ATE529713T1 (en)
BR (1) BRPI0610443A2 (en)
DE (1) DE102005017187B4 (en)
RU (1) RU2367868C2 (en)
WO (1) WO2006108398A1 (en)

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CN103292589B (en) * 2013-06-03 2015-04-01 上海工程技术大学 Air flow guide and ventilation device for large hot air drying room
CN107356061A (en) * 2017-07-12 2017-11-17 安徽弘源化工科技有限公司 A kind of melamine Lacquer finish dried bean noodles drying method
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Also Published As

Publication number Publication date
EP1869386A1 (en) 2007-12-26
WO2006108398A1 (en) 2006-10-19
ATE529713T1 (en) 2011-11-15
RU2007141916A (en) 2009-05-20
DE102005017187A1 (en) 2006-10-19
US20090038176A1 (en) 2009-02-12
DE102005017187B4 (en) 2007-06-21
CN101175964A (en) 2008-05-07
BRPI0610443A2 (en) 2010-06-22
RU2367868C2 (en) 2009-09-20

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