EP1869387B1 - Sechoir continu a structure a plusieurs etages, en particulier pour des produits sous forme de plaques - Google Patents

Sechoir continu a structure a plusieurs etages, en particulier pour des produits sous forme de plaques Download PDF

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Publication number
EP1869387B1
EP1869387B1 EP06722776A EP06722776A EP1869387B1 EP 1869387 B1 EP1869387 B1 EP 1869387B1 EP 06722776 A EP06722776 A EP 06722776A EP 06722776 A EP06722776 A EP 06722776A EP 1869387 B1 EP1869387 B1 EP 1869387B1
Authority
EP
European Patent Office
Prior art keywords
air
dryer
drying
moisture
drying air
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.)
Not-in-force
Application number
EP06722776A
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German (de)
English (en)
Other versions
EP1869387A2 (fr
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
Original Assignee
Lindauer Dornier GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lindauer Dornier GmbH filed Critical Lindauer Dornier GmbH
Publication of EP1869387A2 publication Critical patent/EP1869387A2/fr
Application granted granted Critical
Publication of EP1869387B1 publication Critical patent/EP1869387B1/fr
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 these, 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 floor of the dryer zone is greatest, while the admixing decreases in the direction of the upper floors.
  • 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.
  • the cross-sectional shape of the openings is arbitrary and that the size of the opening can be adjustable.
  • 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 enclosure and saturated with water circulating air is sucked in the direction of the lower levels of the continuous dryer and differentiated supplied via the heat source circulating air in an advantageous manner. 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.
  • 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 roles endlessly circulating screen belt as a means of transport 3 for the product to be dried 4, such as a fiberboard led.
  • the individual designed as a sieve conveyor 3 are driven by means that are not shown here.
  • 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 openings of the blow boxes 5, which are opposite to the transport 3 or the resting on the transport product on the product 4 and this removes the moisture contained therein to a percentage residual moisture content that the product 4 has at the end of the drying process.
  • FIG. 2 The measure according to the invention eliminates the differences with regard to the proportion of residual moisture in the products 4.
  • a longitudinal section according to the line AA in FIG. 1 power in FIG. 2 clearly that on the side facing away from the heat source 10 of the axial fan suction areas 12, best seen in FIG. 3 on the wall 8a of the fan stand 8, a flow channel 13 extending over all floors and ending at a distance below the inside of the horizontal enclosure 2a with an inflow opening 13a facing the enclosure ceiling.
  • 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 region of the fan suction areas 12, openings 15 to the jammed below the housing ceiling and a high moisture content having different drying air over the openings 15 and the inflow opening 13a and supply the circulating air circulation of the lower floors, as indicated by the directional arrows 16.
  • FIG. 3 shows two drying zone 1 of a continuous dryer according to the line BB in FIG. 2 ,
  • the inflow openings 7 of the two pairs of nozzle boxes 5 are connected over the entirety of the floors of the dryer zone 1 to a designed in the form of an air duct fan stand 8.
  • the drying air in the direction of arrow 11 flows over the product 4 to be dried and absorbs moisture therefrom.
  • the drying air laden with moisture symbolize the directional arrows 17.
  • a portion of the moisture-laden drying air according to directional arrow 17 is passed over 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 stage accumulates according to directional arrow 17a under the ceiling of the respective dryer zone 1. This part 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 directional arrow 17a admixed.
  • FIG. 4 Illustrated in a diagram, the measured proportion of the residual moisture in a plate-shaped product after 20 drying zones of one consisting of, for example, 30 dryer zones 1 floor continuous dryer with a substantially horizontal circulating air circuit without and with the inventive solution.
  • 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 moisture laden drying air was about 280 ° C.
  • the proportion of measured residual moisture in the product 4 was between 36.8% and 37.5%, while the proportion of residual moisture was 2/3 of the dryer length on the lower floors, which in the present case are floors 1 to 5 in the product of floors 6 to 8 was already between 37.8% and 38.4%.
  • the invention disclosed above is also applicable to products which do not need to be deprived of water, but which undergo only a 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.

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

Claims (7)

  1. Procédé pour sécher des produits (4) contenant de l'eau, de préférence sous forme de plaques, dans un sécheur continu à plusieurs étages, selon lequel le séchage est effectué au moyen d'air de séchage à haute température dans le procédé à air pulsé, cet air de séchage étant aspiré par des ventilateurs axiaux (9) et amené par l'intermédiaire d'orifices d'amenée (7) à plusieurs boîtes à tuyères (5) disposées à chaque étage au-dessus et au-dessous d'un plan de transport, et passant sur le produit à partir d'au moins une tuyère de la boîte à tuyères concernée, orientée vers les produits, éliminant ensuite de l'humidité du produit, et par la suite, l'air de séchage (17) chargé d'humidité revient par l'intermédiaire d'une source de chaleur (10) aux ventilateurs axiaux (9), et après quoi, en raison des propriétés thermodynamiques, une fraction de l'air de séchage (17) chargé d'humidité s'accumule dans la zone de l'étage supérieur du sécheur, caractérisé en ce que l'air humide accumulé est aspiré et atteint la zone d'aspiration (12) des ventilateurs axiaux disposés sur les étages inférieurs, et ce qu'ensuite, l'air humide est mélangé de façon différenciée à l'air de séchage et est amené aux boîtes à tuyères (5) d'au moins un étage.
  2. Procédé selon la revendication 1, caractérisé en ce que la quantité de l'air chargé d'humidité ajoutée à l'air de séchage au premier étage est la plus grande au premier étage et diminue en direction des étages supérieurs.
  3. Procédé selon la revendication 2, caractérisé en ce que la quantité d'air humide est pour chaque zone d'aspiration du ventilateur inférieure de 30 % à la quantité d'air de séchage pouvant être aspirée.
  4. Sécheur, en particulier sécheur à plusieurs étages pour des produits (4) de préférence en forme de plaques, comprenant des moyens (3), en particulier des rouleaux ou des moyens de type bande pour transporter les produits à l'intérieur du sécheur, dans lequel le sécheur se compose de plusieurs zones de sécheur (1) disposées les unes après les autres dans la direction de transport des produits et présentant une enceinte (2), zones dans lesquelles circule l'air de séchage selon le procédé à air pulsé, dans lequel chaque zone de sécheur possède au moins une source de chaleur centrale (10) et plusieurs ventilateurs axiaux (9) disposés verticalement les uns au-dessus des autres dans un support de ventilateur (8), lesdits ventilateurs axiaux refoulant l'air de séchage par voie directe dans des orifices d'amenée (7) de boîtes à tuyères (5) disposées de préférence par paires au-dessus et au-dessous du moyen de transport (3) pour souffler sur les produits en forme de plaques et aspirant de nouveau l'air de séchage chargé d'humidité par l'intermédiaire de ladite au moins une source de chaleur, caractérisé en ce que dans l'enceinte du support de ventilateur, une canalisation d'air (13) s'étendant verticalement est intégrée dont l'extrémité libre réalise à distance du côté intérieur de l'enceinte horizontale supérieure un orifice d'amenée (13a), et dans lequel la paroi de canalisation de la canalisation d'air, opposée à la zone d'aspiration (12) de chaque ventilateur axial (9) présente des orifices (15) pour une aspiration différentiée de l'air circuler chargé d'humidité.
  5. Sécheur selon la revendication 4, caractérisé en ce que la forme de section transversale des orifices (15) peut être choisie librement.
  6. Sécheur selon la revendication 4, caractérisé en ce que la dimension des orifices (15) est réglable.
  7. Sécheur selon les revendications 4 à 6, caractérisé en ce que la dimension de la section transversale des orifices (15) diminue en direction de l'orifice d'amenée (13a) de la canalisation d'air (13).
EP06722776A 2005-04-13 2006-04-11 Sechoir continu a structure a plusieurs etages, en particulier pour des produits sous forme de plaques Not-in-force EP1869387B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005017152A DE102005017152B4 (de) 2005-04-13 2005-04-13 Verfahren zum Trocknen von vorzugsweise plattenförmigen Produkten und Durchlauftrockner in Mehretagenbauweise
PCT/DE2006/000639 WO2006108396A2 (fr) 2005-04-13 2006-04-11 Sechoir continu a structure a plusieurs etages, en particulier pour des produits sous forme de plaques

Publications (2)

Publication Number Publication Date
EP1869387A2 EP1869387A2 (fr) 2007-12-26
EP1869387B1 true EP1869387B1 (fr) 2009-07-29

Family

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Application Number Title Priority Date Filing Date
EP06722776A Not-in-force EP1869387B1 (fr) 2005-04-13 2006-04-11 Sechoir continu a structure a plusieurs etages, en particulier pour des produits sous forme de plaques

Country Status (8)

Country Link
US (1) US7997003B2 (fr)
EP (1) EP1869387B1 (fr)
CN (1) CN100592015C (fr)
AT (1) ATE438070T1 (fr)
BR (1) BRPI0610553A2 (fr)
DE (2) DE102005017152B4 (fr)
RU (1) RU2359186C1 (fr)
WO (1) WO2006108396A2 (fr)

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CN105276967A (zh) * 2014-06-04 2016-01-27 三久股份有限公司 干燥机的热风装置
DE102018002107A1 (de) * 2018-03-15 2019-09-19 Grenzebach Bsh Gmbh Verfahren und Vorrichtung zum Trocknen von Gipsplatten
CN108486787A (zh) * 2018-04-04 2018-09-04 佛山京联科技信息咨询有限公司 一种新型布料快速清洗烘干机
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US7997003B2 (en) 2011-08-16
ATE438070T1 (de) 2009-08-15
WO2006108396A2 (fr) 2006-10-19
CN101163935A (zh) 2008-04-16
CN100592015C (zh) 2010-02-24
US20080282575A1 (en) 2008-11-20
DE502006004375D1 (de) 2009-09-10
BRPI0610553A2 (pt) 2010-07-06
RU2359186C1 (ru) 2009-06-20
DE102005017152B4 (de) 2007-02-08
EP1869387A2 (fr) 2007-12-26
DE102005017152A1 (de) 2006-10-19
WO2006108396A3 (fr) 2007-10-04

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