EP1869387A2 - Multistage continuous dryer, especially for plate-shaped products - Google Patents

Multistage continuous dryer, especially for plate-shaped products

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Publication number
EP1869387A2
EP1869387A2 EP06722776A EP06722776A EP1869387A2 EP 1869387 A2 EP1869387 A2 EP 1869387A2 EP 06722776 A EP06722776 A EP 06722776A EP 06722776 A EP06722776 A EP 06722776A EP 1869387 A2 EP1869387 A2 EP 1869387A2
Authority
EP
European Patent Office
Prior art keywords
dryer
air
drying
drying air
moisture
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.)
Granted
Application number
EP06722776A
Other languages
German (de)
French (fr)
Other versions
EP1869387B1 (en
Inventor
Alfred Dotzler
Anton Hecht
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lindauer Dornier GmbH
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Lindauer Dornier GmbH
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Filing date
Publication date
Application filed by Lindauer Dornier GmbH filed Critical Lindauer Dornier GmbH
Publication of EP1869387A2 publication Critical patent/EP1869387A2/en
Application granted granted Critical
Publication of EP1869387B1 publication Critical patent/EP1869387B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/101—Supporting materials without tension, e.g. on or between foraminous 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

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 circulated by recirculation, wherein each dryer zone has at least one central heat source and a plurality of axial fan arranged vertically one above the other in a fan stand, which axial fans directly promote the drying air in inflow openings of nozzle boxes arranged above and below the transport means for blowing the plate-shaped products and laden with moisture Aspirate drying air via the at least one heat source again.
  • the air laden with moisture in a recirculation air as low-tempered air to the at least one heat source and subsequently returned as high-temperature air to the fans.
  • Residual moisture measurements in the products leaving the continuous dryer at the end of the drying process have shown that products passing through the dryer on the lower levels of the continuous dryer have lower residual moisture than products containing the continuous dryer on the upper floors run through.
  • the cause of the different residual moisture in the finished dried products is to be found in the fact that a part of the moisture laden, tempered circulating air due to their thermodynamic properties in the upper floors of the continuous dryer dammed.
  • the jammed circulating air may contain 40 gr H 2 O per 1 kg of air. Because this, having a relatively high degree of saturation of water circulating air inevitably by means of the upper floors associated fans on the blow boxes of the upper floors the product is recycled, the blown on the product to be dried moist drying air can not the desired Remove the amount of water from the products. Accordingly, leave the dried products, according to the traversed floors of the dryer, with a different proportion of residual moisture. This is where the invention of the patent application begins.
  • the invention has for its object to provide in a designed as a continuous dryer Mehretagentrockner according to the features of the preamble of claim 1 and 4 such conditions that the proportion of residual moisture in the dried products, regardless of the continuous floor of the continuous dryer, at the end of the drying process is almost constant.
  • each dryer zone is dammed moist air and differentiated admixed to the lower floors to be supplied drying air.
  • the admixture takes place in such a way that the amount of added moist air in the first
  • the amount of moist air per suction area of the axial fan can amount to about 30% of the suctionable amount of drying air of the axial fan.
  • the air duct has openings for the differentiated suction of the stagnant air under the horizontal part of the enclosure and the circulating air which is opposite the immediate suction area of each ventilator.
  • Cross-sectional shape of the openings is freely selectable and that the size of the opening can be adjustable. Furthermore, according to the invention, the size of the openings in the direction of the inflow opening of the air channel decreases with non-adjustable openings.
  • the submerged below the horizontal housing and saturated with water circulating air is sucked in the direction of the lower levels of the continuous dryer in an advantageous manner and differentiated supplied via the heat source flowing circulating air. In this way, a nearly uniform residual moisture in the products, regardless of which floor the product to be dried passes through the continuous dryer achieved.
  • Figure 1 shows the sectional view of a continuous dryer in Mehretagenbauweise with
  • FIG. 1 integrated air duct according to line A-A,
  • FIG. 3 shows the top view of a drying zone along line B-B in FIG. 2,
  • Figure 4 is a diagram showing a comparison of the residual moisture content in the dried product with and without the inventive solution.
  • each dryer zone has a housing 2.
  • the housing 2 consists of a horizontal and several vertical heat insulating walls and encloses several dryer floors.
  • each dryer floor is a non-illustrated rolls endlessly circulating screen belt as a means of transport 3 for the product 4 to be dried, e.g. a fiberboard, guided.
  • the individual designed as a sieve conveyor 3 are driven by means that are not shown here. Furthermore, a plurality of pairs of so-called nozzle boxes 5 are arranged on a frame-like frame 6 below and above the transport means 3 over the length of the dryer zone 1. Each nozzle box 5 has at its one end an inflow opening 7, while its other end is closed.
  • the transport means 3 in the present case, the screen belt, opposite, each nozzle box 5 outflow openings.
  • Below the enclosure 2 at least one fan stand 8 is mounted in each dryer zone with a plurality of vertically superimposed Axiallshareern 9, the at least one heat source 10 heated drying air circulating air in the nozzle boxes 5, as indicated by the directional arrows 11.
  • the blown into the nozzle boxes and heated drying air passes, as stated above, via so-called slot nozzles or otherwise designed
  • the products of the upper floors have an increasingly higher residual moisture of e.g. 39% on.
  • FIG. 2 The inventive measure shown in Figure 2 eliminates the differences in terms of the proportion of residual moisture in the products 4.
  • a longitudinal section along the line AA in Figure 1 makes clear in Figure 2 that on the heat source 10 side facing away from the axial fan suction 12th best seen in Figure 3, on the wall 8a of the fan stand 8, a running over all floors and at a distance below the inside of the horizontal enclosure 2a ending flow channel 13 is arranged with a Umhausungsdecke facing inlet opening 13a.
  • the foundation 14 of the dryer zone 1 facing the other end 13 b of the flow channel 13 is closed.
  • the invention proposes to introduce into the suction channel 13 supporting wall 8a of the fan stand 8, in the area of the fan suction areas 12, openings 15 to the jammed below the Umhausungsdecke and a high
  • Damping portion having drying air via the openings 15 and the inflow opening 13a differentiated to suck and supply the recirculation of the lower floors, as indicated by the directional arrows 16.
  • FIG. 3 shows two dryer zone 1 of a continuous dryer according to the line B-B in FIG. 2.
  • the inflow openings 7 of the respective two pairs of nozzle boxes 5 are connected over the entirety of the floors of the dryer zone 1 to a fan stand 8 designed in the manner of an air channel.
  • the drying air in the direction of arrow 11 flows over the product 4 to be dried and absorbs moisture therefrom.
  • the moisture laden drying air symbolize the directional arrows 16.
  • a portion of the moisture laden drying air according to directional arrow 17 is passed through the heat source 10 and fed as drying air according to directional arrows 11 again drying of the product 4.
  • Another part of the moisture-laden drying air builds up accordingly
  • FIG. 4 shows in a diagram the measured proportion of the residual moisture in a plate-shaped product after 20 dryer zones of a continuous throughflow dryer consisting of, for example, 30 dryer zones 1 with a substantially horizontal recirculating air circuit without and with the solution according to the invention.
  • the percentage of residual moisture is plotted on the abscissa of the graph while the ordinate indicates the number of floors.
  • the temperature of the drying air was about 350 ° C.
  • the temperature of the drying air laden with drying air was about 280 ° C.
  • the invention disclosed above is also applicable to products which do not need to be deprived of water, but which undergo only thermal treatment (thermobonding).
  • the air duct integrated in the fan stand can counteract the thermal of the night-tempered air and cause a comparison of the air temperature in the dryer floors.

Abstract

The invention relates to a method for drying preferably plate-shaped products containing water in a multistage continuous dryer as well as such a dryer for carrying out said method. The invention is characterized in that humid air accumulated below the housing (2) in a dryer of said type is sucked off and is conveyed into the suction zone (12) of the axial fans (9) located in the lower stages, whereupon humid air is admixed in a differentiated manner to an amount of drying air and is delivered to the nozzle boxes (5) of the dryer.

Description

Durchlauftrockner in Mehretagenbauweise, insbesondere für plattenförmige Continuous dryers in multi-day construction, especially for plate-shaped
ProdukteProducts
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 zirkuliert, wobei jede Trocknerzone wenigstens eine zentrale Wärmequelle und mehrere in einem Lüfterständer vertikal übereinander angeordnete Axiallüfter aufweist, welche Axiallüfter die Trocknungsluft auf direktem Wege in Zuströmöffnungen von über und unter dem Transportmittel angeordneten Düsenkästen zum Beblasen der plattenförmigen Produkte fördern und die 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 circulated by recirculation, wherein each dryer zone has at least one central heat source and a plurality of axial fan arranged vertically one above the other in a fan stand, which axial fans directly promote the drying air in inflow openings of nozzle boxes arranged above and below the transport means for blowing the plate-shaped products and laden with moisture Aspirate drying air via the at least one heat source again.
Durchlauftrockner mit den vorgenannten Merkmalen sind seit langem bekannt, siehe auch „Die richtige Lösung für die Bauplatten-Industrie", Prospekt der Lindauer DORNIER GmbH, Seite 6/7, Impressum 12/01/LD/02/99.Continuous dryers with the aforementioned features have long been known, see also "The right solution for the building board industry", Prospectus of Lindauer DORNIER GmbH, page 6/7, Imprint 12/01 / LD / 02/99.
In den bekannten mehretagigen Durchlauftrocknern, in denen den zu trocknenden Produkten Feuchte durch hochtemperierte Luft entzogen wird, gelangt die mit Feuchte beladene Luft in einem Umluftkreislauf als niedrig temperierte Luft zu der wenigstens einen Wärmequelle und nachfolgend als hoch temperierte Luft zu den Lüftern zurück.In the known multi-day continuous dryers in which moisture is removed from the products to be dried by high-temperature air, the air laden with moisture in a recirculation air as low-tempered air to the at least one heat source and subsequently returned as high-temperature air to the fans.
Messungen zur Ermittlung der Restfeuchte in den Produkten, die den Durchlauftrockner am Ende des Trocknungsprozesses verlassen, haben gezeigt, dass Produkte, die den Trockner in den unteren Etagen des Durchlauftrockners durchlaufen, eine geringere Restfeuchte besitzen, als Produkte, die den Durchlauftrockner in den oberen Etagen durchlaufen.Residual moisture measurements in the products leaving the continuous dryer at the end of the drying process have shown that products passing through the dryer on the lower levels of the continuous dryer have lower residual moisture than products containing the continuous dryer on the upper floors run through.
Die Ursache der unterschiedlichen Restfeuchte in den fertig getrockneten Produkten ist darin zu suchen, dass sich ein Teil der mit Feuchte beladenen, temperierten Umluft aufgrund deren thermodynamischer Eigenschaften in den oberen Etagen des Durchlauftrockners staut. So kann die gestaute Umluft z.B. 40 gr H2O pro 1kg Luft beinhalten. Weil diese, einen relativ hohen Sättigungsgrad an Wasser aufweisende Umluft zwangsläufig mittels der den oberen Etagen zugeordneten Lüftern über die Blaskästen der oberen Etagen dem Produkt wieder zugeführt wird, kann die auf das zu trocknende Produkt geblasene feuchte Trocknungsluft nicht die gewünschte Wassermenge den Produkten entziehen. Demnach verlassen die getrockneten Produkte, entsprechend der durchlaufenen Etagen des Trockners, mit unterschiedlichem Anteil an Restfeuchte. Hier setzt die Erfindung der Patentanmeldung an.The cause of the different residual moisture in the finished dried products is to be found in the fact that a part of the moisture laden, tempered circulating air due to their thermodynamic properties in the upper floors of the continuous dryer dammed. For example, the jammed circulating air may contain 40 gr H 2 O per 1 kg of air. Because this, having a relatively high degree of saturation of water circulating air inevitably by means of the upper floors associated fans on the blow boxes of the upper floors the product is recycled, the blown on the product to be dried moist drying air can not the desired Remove the amount of water from the products. Accordingly, leave the dried products, according to the traversed floors of the dryer, with a different proportion of residual moisture. This is where the invention of the patent application begins.
Der Erfindung liegt die Aufgabe zugrunde, in einem als Durchlauftrockner ausgebildeten Mehretagentrockner gemäß der Merkmale des Oberbegriffs von Patentanspruch 1 und 4 solche Bedingungen zu schaffen, dass der Anteil der Restfeuchte in den getrockneten Produkten, unabhängig von der durchlaufenden Etage des Durchlauftrockners, am Ende des Trocknungsprozesses nahezu konstant ist.The invention has for its object to provide in a designed as a continuous dryer Mehretagentrockner according to the features of the preamble of claim 1 and 4 such conditions that the proportion of residual moisture in the dried products, regardless of the continuous floor of the continuous dryer, at the end of the drying process is almost constant.
Die Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale von Patentanspruch 1 und 4 gelöst.The object is achieved by the characterizing features of claim 1 and 4.
Gemäß Patentanspruch 1 wird die unterhalb der oberen horizontalen Umhausung vorzugsweise jeder Trocknerzone sich stauende Feuchtluft abgesaugt und differenziert der den unteren Etagen zuzuführenden Trocknungsluft zugemischt.According to claim 1, the below the upper horizontal enclosure preferably each dryer zone is dammed moist air and differentiated admixed to the lower floors to be supplied drying air.
Die Zumischung erfolgt derart, dass die Menge der zugemischten Feuchtluft in der erstenThe admixture takes place in such a way that the amount of added moist air in the first
Etage der Trocknerzone am größten ist, während das Zumischen in Richtung der oberenFloor of the dryer zone is the largest, while the admixing in the direction of the upper
Etagen abnimmt. Die Feuchtluftmenge je Saugbereich des Axiallüfters kann dabei bis etwa 30 % der ansaugbaren Trocknungsluftmenge des Axiallüfters betragen.Floors decreases. The amount of moist air per suction area of the axial fan can amount to about 30% of the suctionable amount of drying air of the axial fan.
Gemäß Patentanspruch 4 ist in einem vertikal verlaufenden Teil der Umhausung wenigstens einiger Trocknerzonen und zwar im Bereich der Umhausung des Lüfterständers ein in seinem Querschnitt hinreichend groß dimensionierter und vertikal verlaufender Luftkanal integriert. Das dem horizontal verlaufenden Teil der Umhausung gegenüber liegende freie Ende des Luftkanals bildet dabei, beabstandet von dem Umhausungsteil eine Zuströmöffnung für die mit Wasser gesättigte Umluft (gestaute Feuchtluft) aus. Um über die Zuströmöffnung die mit Wasser gesättigte Umluft absaugen zu können, besitzt der Luftkanal in der dem unmittelbaren Saugbereich jedes Lüfters gegenüberliegenden Kanalwand des Luftkanals Öffnungen zum differenzierten Ansaugen der unter dem horizontalen Teil der Umhausung gestauten und mit Feuchte beladenen Umluft. In Ausgestaltung der erfindungsgemäßen Lösung ist vorgesehen, dass dieAccording to claim 4 is integrated in a vertically extending part of the enclosure of at least some dryer zones in the area of the enclosure of the fan stand in its cross section sufficiently large-dimensioned and vertically extending air duct. The horizontal end of the housing opposite the free end of the air duct forms, spaced from the Umhausungsteil an inflow for the saturated with water circulating air (dammed wet air) from. In order to be able to extract the water-saturated circulating air via the inflow opening, the air duct has openings for the differentiated suction of the stagnant air under the horizontal part of the enclosure and the circulating air which is opposite the immediate suction area of each ventilator. In an embodiment of the solution according to the invention it is provided that the
Querschnittsform der Öffnungen frei wählbar ist und dass die Größe der Öffnung einstellbar sein kann. Ferner ist erfindungsgemäß vorgesehen, dass bei nicht einstellbaren Öffnungen die Größe der Öffnungen in Richtung der Zuströmöffnung des Luftkanals abnimmt.Cross-sectional shape of the openings is freely selectable and that the size of the opening can be adjustable. Furthermore, according to the invention, the size of the openings in the direction of the inflow opening of the air channel decreases with non-adjustable openings.
Mit der erfindungsgemäßen Lösung wird in vorteilhafter Weise die unterhalb der horizontalen Umhausung gestaute und mit Wasser gesättigte Umluft in Richtung der unteren Etagen des Durchlauftrockners gesaugt und differenziert der über die Wärmequelle strömenden Umluft zugeführt. Auf diese Weise wird eine nahezu gleichmäßige Restfeuchte in den Produkten, unabhängig davon, in welcher Etage das zu trocknende Produkt den Durchlauftrockner durchläuft, erzielt.With the solution according to the invention, the submerged below the horizontal housing and saturated with water circulating air is sucked in the direction of the lower levels of the continuous dryer in an advantageous manner and differentiated supplied via the heat source flowing circulating air. In this way, a nearly uniform residual moisture in the products, regardless of which floor the product to be dried passes through the continuous dryer achieved.
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:In the drawings show:
Figur 1 die Schnittdarstellung eines Durchlauftrockners in Mehretagenbauweise mitFigure 1 shows the sectional view of a continuous dryer in Mehretagenbauweise with
Axiallüftern in vertikaler Anordnung,Axial fans in vertical arrangement,
Figur 2 den gemäß der Erfindung in einer Trocknerzone des Durchlauftrockners gem. Figur 1 integrierten Luftkanal nach Linie A-A,Figure 2 according to the invention in accordance with the invention in a drying zone of the continuous dryer gem. FIG. 1 integrated air duct according to line A-A,
Figur 3 die Draufsicht einer Trocknerzone nach Linie B-B in Figur 2,FIG. 3 shows the top view of a drying zone along line B-B in FIG. 2,
Figur 4 ein Diagramm mit Vergleichsdarstellung des Restfeuchtegehaltes im getrockneten Produkt mit und ohne der erfindungsgemäßen Lösung.Figure 4 is a diagram showing a comparison of the residual moisture content in the dried product with and without the inventive solution.
In der gemäß Figur 1 schematisch dargestellten Trocknerzone 1 eines aus mehreren derartiger Trocknerzonen bestehenden Mehretagen-Durchlauftrockners weist jede Trocknerzone eine Umhausung 2 auf. Die Umhausung 2 besteht aus einer horizontal und mehreren vertikal verlaufenden Wärmeisolierwänden und umschließt mehrere Trockneretagen. In jeder Trockneretage ist ein auf nicht dargestellten Rollen endlos umlaufendes Siebband als Transportmittel 3 für das zu trocknende Produkt 4, z.B. eine Faserplatte, geführt.In the dryer zone 1 shown schematically in FIG. 1 of a multi-stage continuous dryer consisting of a plurality of such dryer zones, each dryer zone has a housing 2. The housing 2 consists of a horizontal and several vertical heat insulating walls and encloses several dryer floors. In each dryer floor is a non-illustrated rolls endlessly circulating screen belt as a means of transport 3 for the product 4 to be dried, e.g. a fiberboard, guided.
Die einzelnen als Siebbänder ausgebildeten Transportmittel 3 sind von Mitteln angetrieben, die hier nicht dargestellt sind. Über die Länge der Trocknerzone 1 sind des weiteren unterhalb und oberhalb des Transportmittels 3 mehrere Paare von sogenannten Düsenkästen 5 an einem rahmenartigen Gestell 6 angeordnet. Jeder Düsenkasten 5 besitzt an seinem einen Ende eine Zuströmöffnung 7, während sein anderes Ende geschlossen ist.The individual designed as a sieve conveyor 3 are driven by means that are not shown here. Furthermore, a plurality of pairs of so-called nozzle boxes 5 are arranged on a frame-like frame 6 below and above the transport means 3 over the length of the dryer zone 1. Each nozzle box 5 has at its one end an inflow opening 7, while its other end is closed.
Dem Transportmittel 3, in vorliegendem Falle dem Siebband, gegenüberliegend weist jeder Düsenkasten 5 Ausströmöffnungen auf. Unterhalb der Umhausung 2 ist in jeder Trocknerzone wenigstens ein Lüfterständer 8 mit mehreren vertikal übereinander angeordneten Axiallüftern 9 montiert, die von wenigstens einer Wärmequelle 10 erwärmte Trocknungsluft im Umluftverfahren in die Düsenkästen 5 blasen, wie durch die Richtungspfeile 11 angedeutet. Die in die Düsenkästen eingeblasene und erwärmte Trocknungsluft gelangt, wie vorstehend ausgeführt, über sogenannte Schlitzdüsen oder anderweitig gestalteteThe transport means 3, in the present case, the screen belt, opposite, each nozzle box 5 outflow openings. Below the enclosure 2 at least one fan stand 8 is mounted in each dryer zone with a plurality of vertically superimposed Axiallüftern 9, the at least one heat source 10 heated drying air circulating air in the nozzle boxes 5, as indicated by the directional arrows 11. The blown into the nozzle boxes and heated drying air passes, as stated above, via so-called slot nozzles or otherwise designed
Öffnungen der Blaskästen 5, die dem Transportmittel 3 bzw. dem auf dem Transportmittel aufliegenden Produkt gegenüberliegen, auf das Produkt 4 und entzieht diesem die darin enthaltene Feuchte bis zu einem prozentualen Restfeuchteanteil, den das Produkt 4 am Ende des Trocknerprozesses aufweist.Openings of the blow boxes 5, which are opposite to the means of transport 3 or the product lying on the means of transport, on the product 4 and withdraws the moisture contained therein up to a percentage residual moisture content, the product 4 has at the end of the drying process.
Die beim Trocknungsprozess von plattenartigen Produkten in einem solchen Mehretagen- Durchlauftrockner auftretenden Nachteile sind im Stand der Technik insofern bereits dargestellt, als das thermodynamische Verhalten der mit Feuchte beladenen Trocknungsluft dazu führt, dass unterhalb der horizontal verlaufenden Umhausung 2 des Durchlauftrockners 1 , also sich unter deren Decke, Trocknungsluft mit hohemThe disadvantages encountered in the drying process of plate-like products in such a multi-day continuous dryer are already shown in the prior art insofar as the thermodynamic behavior of the moisture-laden drying air causes below the horizontally extending enclosure 2 of the continuous dryer 1, that is below Ceiling, drying air with high
Feuchtegehalt staut, die der horizontal zirkulierenden Umluft in den oberen Etagen des Durchlauftrockners wieder zugeführt wird. Die Folge ist, dass der relative Feuchteanteil in den Produkten am Ende des Trocknungsprozesses verschieden groß ist und nur durch hohen technischen Aufwand z.B. an den Wärmequellen ausgeglichen werden kann. Während die den Trockner in den unteren Etagen durchlaufenden Produkte 4, z.B in der 20. Zone von insgesamt 30, eine Restfeuchte von etwas 36 % besitzen, weisen die Produkte der oberen Etagen eine zunehmend höhere Restfeuchte von z.B. 39 % auf.Moisture content accumulates, which is fed back to the circulating circulating air in the upper levels of the continuous dryer. The result is that the relative moisture content in the products at the end of the drying process is different and only by high technical complexity, e.g. can be balanced at the heat sources. While the products 4 traveling through the dryer on the lower floors, for example in the 20th zone of a total of 30, have a residual moisture content of about 36%, the products of the upper floors have an increasingly higher residual moisture of e.g. 39% on.
Die in Figur 2 gezeigte erfindungsgemäße Maßnahme beseitigt die Unterschiede im Hinblick auf den Anteil der Restfeuchte in den Produkten 4. Ein Längsschnitt gemäß der Linie A-A in Figur 1 macht in Figur 2 deutlich, dass auf der der Wärmequelle 10 abgewandten Seite der Axiallüfter-Saugbereiche 12, am besten zu sehen in Figur 3, und zwar an der Wand 8a des Lüfterständers 8, ein über alle Etagen verlaufender und mit Abstand unter der Innenseite der horizontalen Umhausung 2a endender Strömungskanal 13 mit einer der Umhausungsdecke zugewandten Zuströmöffnung 13a angeordnet ist. Das dem Fundament 14 der Trocknerzone 1 zugewandte andere Ende 13b des Strömungskanals 13 ist geschlossen. Zur Vergleichmäßigung des Anteils der Restfeuchte in den Produkten 4 ist erfindungsgemäß vorgesehen, in die den Saugkanal 13 tragende Wand 8a des Lüfterständers 8, und zwar im Bereich der Lüfter-Saugbereiche 12, Öffnungen 15 einzubringen, um die unterhalb der Umhausungsdecke gestaute und einen hohenThe inventive measure shown in Figure 2 eliminates the differences in terms of the proportion of residual moisture in the products 4. A longitudinal section along the line AA in Figure 1 makes clear in Figure 2 that on the heat source 10 side facing away from the axial fan suction 12th best seen in Figure 3, on the wall 8a of the fan stand 8, a running over all floors and at a distance below the inside of the horizontal enclosure 2a ending flow channel 13 is arranged with a Umhausungsdecke facing inlet opening 13a. The foundation 14 of the dryer zone 1 facing the other end 13 b of the flow channel 13 is closed. To even out the proportion of the residual moisture in the products 4, the invention proposes to introduce into the suction channel 13 supporting wall 8a of the fan stand 8, in the area of the fan suction areas 12, openings 15 to the jammed below the Umhausungsdecke and a high
Feuchteanteil aufweisende Trocknungsluft über die Öffnungen 15 und die Zuströmöffnung 13a differenziert abzusaugen und den Umluftkreislauf der unteren Etagen zuzuführen, wie das mit den Richtungspfeilen 16 angedeutet ist.Damping portion having drying air via the openings 15 and the inflow opening 13a differentiated to suck and supply the recirculation of the lower floors, as indicated by the directional arrows 16.
In Figur 3 zeigt zwei Trocknerzone 1 eines Durchlauftrockners gemäß der Linie B-B in Figur 2. Die Zuströmöffnungen 7 der jeweils zwei Paare von Düsenkästen 5 sind über die Gesamtheit der Etagen der Trocknerzone 1 an einen in Art eines Luftkanals ausgebildeten Lüfterständer 8 angeschlossen.3 shows two dryer zone 1 of a continuous dryer according to the line B-B in FIG. 2. The inflow openings 7 of the respective two pairs of nozzle boxes 5 are connected over the entirety of the floors of the dryer zone 1 to a fan stand 8 designed in the manner of an air channel.
Die Trocknungsluft gemäß Pfeilrichtung 11 strömt über das zu trocknende Produkt 4 und nimmt von diesem Feuchte auf. Die mit Feuchte beladene Trocknungsluft symbolisieren die Richtungspfeile 16. Ein Teil der mit Feuchte beladenen Trocknungsluft gemäß Richtungspfeil 17 wird über die Heizquelle 10 geleitet und als Trocknungsluft gemäß Richtungspfeile 11 erneut dem Trocknen des Produktes 4 zugeführt. Ein anderer Teil der mit Feuchte beladenen Trocknungsluft staut sich gemäßThe drying air in the direction of arrow 11 flows over the product 4 to be dried and absorbs moisture therefrom. The moisture laden drying air symbolize the directional arrows 16. A portion of the moisture laden drying air according to directional arrow 17 is passed through the heat source 10 and fed as drying air according to directional arrows 11 again drying of the product 4. Another part of the moisture-laden drying air builds up accordingly
Richtungspfeil 17a unter der Decke der betreffenden Trocknerzone 1. Dieser Teil Feuchte beladener Trocknungsluft wird über die Öffnungen 15 und den Strömungskanal 13 mittels der Axiallüfter 9 abgesaugt und der Trocknungsluft gemäß Richtungspfeil 17a zugemischt.Directional arrow 17a under the ceiling of the respective dryer zone 1. This part of moisture-laden drying air is sucked through the openings 15 and the flow channel 13 by means of the axial fan 9 and the drying air according to the direction arrow 17a admixed.
Figur 4 veranschaulicht in einem Diagramm den gemessenen Anteil der Restfeuchte in einem plattenförmigen Produkt nach 20 Trocknerzonen eines aus z.B. 30 Trocknerzonen 1 bestehenden Etagen-Durchlauftrockners mit im wesentlichen horizontalem Umluftkreislauf ohne und mit der erfindungsgemäßen Lösung. Der prozentuale Anteil der Restfeuchte ist auf der Abszisse des Diagramms aufgetragen während auf der Ordinate die Anzahl der Etagen angegeben ist. Die Temperatur der Trocknungsluft betrug etwa 3500C. Die Temperatur der mit Feuchte beladenen Trocknungsluft betrug etwa 2800C. Ohne der erfindungsgemäßen Lösung betrug nach 2/3 der Trocknerlänge an den unteren Etagen, wozu im vorliegenden Falle die Etagen 1 bis 5 gehören, der Anteil gemessener Restfeuchte im Produkt 4 zwischen 36,8 % und 37,5 %, während der Anteil der Restfeuchte im Produkt der Etagen 6 bis 8 bereits zwischen 37,8 % und 38,4 % lag. Es liegt also ein deutlich unterschiedlicher Anteil an Restfeuchte nach dem Trocknungsprozess vor, wie die gestrichelte Linie in dem Diagramm zeigt. Die erfindungsgemäße Lösung hat in überraschender Weise deutlich gemacht, dass der Anteil der Restfeuchte in den Produkten der unteren Etagen des Trockners geringfügig größer ist, aber in den Etagen 6 bis 8 deutlich verringert werden konnte, wie die durchgehende Linie im Diagramm zeigt.FIG. 4 shows in a diagram the measured proportion of the residual moisture in a plate-shaped product after 20 dryer zones of a continuous throughflow dryer consisting of, for example, 30 dryer zones 1 with a substantially horizontal recirculating air circuit without and with the solution according to the invention. The percentage of residual moisture is plotted on the abscissa of the graph while the ordinate indicates the number of floors. The temperature of the drying air was about 350 ° C. The temperature of the drying air laden with drying air was about 280 ° C. Without the solution according to the invention, after 2/3 of the dryer length on the lower floors, which in the present case are floors 1 to 5, the proportion of measured residual moisture in product 4 was between 36.8% and 37.5%, while the proportion of residual moisture in the product of floors 6 to 8 was already between 37.8% and 38.4%. So there is a significantly different proportion of residual moisture after the drying process, as the dashed line in the diagram shows. The solution of the invention has surprisingly made clear that the proportion of residual moisture in the products of the lower levels of the dryer is slightly larger, but could be significantly reduced in the floors 6 to 8, as the solid line in the diagram shows.
Mit der erfindungsgemäßen Lösung wird also in vorteilhafter Weise eine gleichmäßige Restfeuchte in den Platten über alle Etagen erreicht. Dies führt zur Erhöhung der Produktionsmenge bei gleichem Energieeinsatz. Außerdem wird eine Verbesserung der Qualität der Produkte erreicht.With the solution according to the invention, therefore, a uniform residual moisture in the plates over all floors is achieved in an advantageous manner. This leads to an increase in the production volume with the same energy input. In addition, an improvement in the quality of the products is achieved.
Es sei noch darauf hingewiesen, dass die vorstehend offenbarte Erfindung auch für Produkte anwendbar ist, denen kein Wasser entzogen werden muss, sondern die lediglich einer thermischen Behandlung (Thermobonding) unterzogen werden. In diesem Fall kann der in den Lüfterständer integrierte Luftkanal der Thermik nachtemperierter Luft entgegenwirken und eine Vergleichsmäßigung der Lufttemperatur in den Trockneretagen bewirken. It should be noted that the invention disclosed above is also applicable to products which do not need to be deprived of water, but which undergo only thermal treatment (thermobonding). In this case, the air duct integrated in the fan stand can counteract the thermal of the night-tempered air and cause a comparison of the air temperature in the dryer floors.

Claims

Patentansprüche claims
1. Verfahren zum Trocknen von Wasser beinhaltenden, vorzugsweise plattenförmigen Produkten in einem Durchlauftrockner in Mehretagenbauweise, wonach das Trocknen mittels hochtemperierter Trocknungsluft im Umluftverfahren erfolgt, welche Trocknungsluft durch Axiallüfter angesaugt und über Zuströmöffnungen mehrerer in jeder Etage über- und unterhalb einer Transportebene angeordneten Düsenkästen zugeführt wird und aus wenigstens einer in Richtung der Produkte weisenden Düse des betreffenden Düsenkastens auf das Produkt strömt, daraufhin dem Produkt Feuchte entzieht und nachfolgend die mit Feuchte beladene Trocknungsluft über eine Wärmequelle zurück zu den Axiallüftern strömt und wonach aufgrund thermodynamischer Eigenschaften sich ein Anteil mit Feuchte beladener Trocknungsluft im Bereich der oberen Etage des Trockners staut, dadurch gekennzeichnet, dass die gestaute Feuchtluft abgesaugt wird und in den Saugbereich der in den unteren Etagen angeordneten Axiallüfter gelangt und dass daraufhin der Trocknungsluft die Feuchtluft differenziert zugemischt und den Düsenkästen wenigstens einer Etage zugeführt wird.1. A method for drying water-containing, preferably plate-shaped products in a continuous dryer in multi-day construction, after which the drying by means of high-temperature drying air in the recirculation method, which drying air sucked through axial fans and supplied via inflow several on each floor above and below a transport plane arranged nozzle boxes and flows from at least one pointing in the direction of the product nozzle of the nozzle box concerned on the product, then removes moisture from the product and subsequently flows the moisture-laden drying air via a heat source back to the axial fans and then due to thermodynamic properties, a proportion of humidity laden drying air accumulates in the upper floor of the dryer, characterized in that the dammed wet air is sucked and succeeded in the suction of arranged in the lower floors axial fan t and that then the drying air differentiated added to the moist air and the nozzle boxes at least one floor is supplied.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die zugemischte Menge der mit Feuchte beladenen Luft zur Trocknungsluft in der ersten Etage am größten ist und in Richtung der oberen Etagen abnimmt.2. The method according to claim 1, characterized in that the admixed amount of moisture-laden air to the drying air in the first floor is greatest and decreases in the direction of the upper floors.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die Feuchtluftmenge je Saugbereich des Lüfters kleiner 30 % der ansaugbaren Trocknungsluftmenge beträgt.3. The method according to claim 2, characterized in that the amount of moist air per suction area of the fan is less than 30% of the suctionable amount of drying air.
4. Trockner, insbesondere Mehretagentrockner für vorzugsweise plattenförmige Produkte (4), mit Mitteln (3), insbesondere Rollen oder bandartige Mittel zum Transport der Produkte innerhalb des Trockners, wobei der Trockner aus mehreren von in Transportrichtung der Produkte hintereinander angeordneten, eine Umhausung (2) aufweisende Trocknerzonen (1) besteht, in denen Trocknungsluft im Umluftverfahren zirkuliert, wobei jede Trocknerzone wenigstens eine zentrale Wärmequelle (10) und mehrere in einem Lüfterständer (8) vertikal übereinander angeordnete Axiallüfter (9) besitzt, welche Axiallüfter die Trocknungsluft auf direktem Wege in Zuströmöffnungen (7) von bevorzugt paarweise über und unter dem Transportmittel (3) angeordneten Düsenkästen (5) zum Beblasen der plattenförmigen Produkte fördern und die mit Feuchte beladene Trocknungsluft über die wenigstens eine Wärmequelle wieder ansaugen, dadurch gekennzeichnet, dass in die Umhausung des Lüfterständers ein vertikal verlaufender Luftkanal (13) integriert ist, dessen freies Ende beabstandet von der Innenseite der oberen horizontalen Umhausung eine Zuströmöffnung (13a) ausbildet, und wobei die dem Saugbereich (12) jedes Axiallüfters (9) gegenüberliegende Kanalwand des Luftkanals Öffnungen (15) zum differenzierten Ansaugen der mit Feuchte beladenen Umluft aufweist.4. dryer, in particular multi-storage dryer for preferably plate-shaped products (4), with means (3), in particular rollers or belt-like means for transporting the products within the dryer, wherein the dryer of a plurality of arranged in the transport direction of the products one behind the other, a housing (2 ), wherein each drying zone at least one central heat source (10) and a plurality of in a fan stand (8) vertically stacked axial fan (9) has, which axial fan, the drying air in a direct way in Feed openings (7) of preferably in pairs above and below the transport means (3) arranged nozzle boxes (5) for blowing the plate-shaped products promote and laden with moisture Drying air on the at least one heat source to suck back, characterized in that in the enclosure of the fan stand, a vertically extending air duct (13) is integrated, the free end spaced from the inside of the upper horizontal housing an inflow opening (13 a) is formed, and wherein the Suction region (12) of each axial fan (9) opposite channel wall of the air duct openings (15) for differentiated suction of the moisture-laden circulating air has.
5. Trockner nach Anspruch 4, dadurch gekennzeichnet, dass die Querschnittsform der Öffnungen (15) beliebig wählbar ist.5. Dryer according to claim 4, characterized in that the cross-sectional shape of the openings (15) is arbitrary selectable.
6. Trockner nach Anspruch 4, dadurch gekennzeichnet, dass die Größe der Öffnungen (15) einstellbar ist.6. Dryer according to claim 4, characterized in that the size of the openings (15) is adjustable.
7. Trockner nach den Ansprüchen 4 bis 6, dadurch gekennzeichnet, dass die Größe des Querschnitts der Öffnungen (15) in Richtung der Zuströmöffnung (13a) des Luftkanals (13) abnimmt. 7. Dryer according to claims 4 to 6, characterized in that the size of the cross section of the openings (15) in the direction of the inflow opening (13 a) of the air duct (13) decreases.
EP06722776A 2005-04-13 2006-04-11 Multistage continuous dryer, especially for plate-shaped products Not-in-force EP1869387B1 (en)

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EP1869387B1 (en) 2009-07-29
US20080282575A1 (en) 2008-11-20
BRPI0610553A2 (en) 2010-07-06
CN100592015C (en) 2010-02-24
ATE438070T1 (en) 2009-08-15
DE102005017152A1 (en) 2006-10-19
RU2359186C1 (en) 2009-06-20
DE102005017152B4 (en) 2007-02-08
WO2006108396A2 (en) 2006-10-19
WO2006108396A3 (en) 2007-10-04
DE502006004375D1 (en) 2009-09-10
US7997003B2 (en) 2011-08-16
CN101163935A (en) 2008-04-16

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