EP2092258B1 - Procédé de séchage de bois assemblé sous forme de piles - Google Patents

Procédé de séchage de bois assemblé sous forme de piles Download PDF

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Publication number
EP2092258B1
EP2092258B1 EP07845262A EP07845262A EP2092258B1 EP 2092258 B1 EP2092258 B1 EP 2092258B1 EP 07845262 A EP07845262 A EP 07845262A EP 07845262 A EP07845262 A EP 07845262A EP 2092258 B1 EP2092258 B1 EP 2092258B1
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EP
European Patent Office
Prior art keywords
drying
wood
gas
piles
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.)
Not-in-force
Application number
EP07845262A
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German (de)
English (en)
Other versions
EP2092258A2 (fr
Inventor
Kurt Ing. Mühlböck
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Individual
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Publication of EP2092258A2 publication Critical patent/EP2092258A2/fr
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Not-in-force legal-status Critical Current
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Classifications

    • 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
    • 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
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
    • F26B2210/16—Wood, e.g. lumber, timber

Definitions

  • the invention relates to a method for drying stacked wood, which is dried during a stepwise batch conveyance through a drying channel by means of opposing drying gas streams in successive drying zones to a final moisture content below the fiber saturation, the determined by the number of stacked in the conveying direction wood pile certain Stacking depth of the drying zones increases in the conveying direction.
  • the drying channel forms two drying zones with partially circulated Trocknungsgasströmen, preferably air streams, of which the input side flow against the direction of passage of the wood stack and the output side in the direction of passage through the drying zones.
  • the partial replacement of the two drying gas streams by fresh gas, for which a common inlet is provided in the region of the inlet-side drying gas circulation, is controlled by a common, the output side drying gas cycle associated exhaust flap.
  • This desired independence of the final moisture from the initial moisture is of particular importance, because the moisture content of the individual to dry a stack of combined woods varies greatly, but for the further processing of the dried wood should be a uniform residual moisture.
  • a disadvantage of this known method for drying wood in a drying channel is that the variations in the residual moisture of the dried wood can only be kept within tolerable limits if the drying rate is kept relatively low.
  • the invention is therefore based on the object, a method of the type described for drying stacked wood in such a way that combined to stack woods with very different initial moisture can be dried together in a narrow tolerance range to a predetermined final moisture, with a comparatively low energy consumption.
  • the invention achieves the stated object in that the wood in two input-side drying zones, at least substantially with supplied between these drying zones fresh gas to a moisture content in the fiber saturation region, but substantially above the fiber saturation and then in at least one further drying zone by means of at least partially in the circulation guided, adjustable in terms of its temperature and humidity drying gas stream is dried to the final moisture.
  • the fiber saturation wood can be dried as quickly as desired, without damaging, can be dispensed with a moisture content of the wood above the fiber saturation to a certain minimum moisture ensuring circulation flow of the drying gas, so that the wood with a moisture content above the fiber saturation comparatively dry fresh gas can be supplied.
  • the gas temperature can be kept low, which is especially in connection with a very different moisture content of the individual pieces of wood to be dried stack of importance because the rate of drying of woods with a lower moisture content compared to the wood with a higher moisture content decreases.
  • a drying zone follows in which the drying rate in the conveying direction decreases due to the increasing moisture load of the drying gas flowing in the conveying direction, in particular at a corresponding stacking depth.
  • the stacking depth of the inlet-side drying zone should, however, be kept small in order to ensure a high, not affected by an increasing steam load drying rate despite the low temperature of the drying gas.
  • the rising in the conveying direction moisture content of the fresh gas flow also has a balancing effect on the different moisture contents of the individual woods, so that in the described drying to near fiber saturation has already taken place a substantial adjustment of the moisture content of the individual woods to an average value.
  • the drying must be converted to a conventional guidance of the drying gas in a partial cycle in order to avoid drying damage, which only appear below the fiber saturation in appearance.
  • the drying is carried out to the final moisture, wherein by a corresponding adjustment of the temperature and humidity of the circulating drying gas and by an advantageous choice of stacking depth, taking into account the respective flow direction for a further moisture compensation the required final moisture uniformly in a small tolerance range can be ensured.
  • the drying of the wood in the range of wood moisture above the fiber saturation can be accelerated by a moderate heating of the drying gas by the fresh gas is heated after preheating in the heat exchange with the exhaust gas from the acted upon with the fresh gas drying zone by at least one heating coil, which is an advantageous utilization the heat energy brings with it.
  • the wood after drying with fresh gas, the wood can pass through additional drying zones to adapt to a favorable average drying process of the individual woods of a stack, in which corresponding drying conditions are ensured by suitable influences on the drying gas flow.
  • the wood can be dried to a moisture content essentially below the fiber saturation in an intermediate zone provided between the outlet-side drying zone in the conveying direction and the two inlet-side drying zones by means of a drying gas stream which is at least partially circulated and adjustable with respect to its temperature and moisture content , so that in the fiber saturation region a gentle transition of the moisture content of a value above the fiber saturation to a value below the fiber saturation results, which is then of increased importance, if not achieved after drying with fresh gas sufficient equalization of the moisture content of the individual woods of a stack could be.
  • the device shown has a housing 1, which forms a drying channel 2, which is provided with a conveyer, not shown for reasons of clarity for gradually through the drying channel 2 to be conveyed wood stack 3.
  • the combined from individual woods stack 3 are successively conveyed by means of the conveyor through individual conveyor zones 4, 5, 6 and 7, wherein the stacking depth, by the number of stacked in the conveying direction 8 wood stack 3 in the drying zones 4, 5, 6 and 7 is determined, increases in the conveying direction 8, which entails a corresponding extension of the residence time of the individual wood stacks in the respective drying zone 5, 7 by itself. Only the residence time of the wood stacks 3 in the intermediate zone 6 between the drying zones 5 and 7 corresponds to the residence time in the drying zone 3, but this is not mandatory.
  • the individual drying zones 4 to 7 are charged with a drying gas, generally air, which is guided in opposite directions through the drying zones 4 to 7, as indicated in the drawing by the flow arrows.
  • a drying gas generally air
  • the drying gas streams consist at least substantially of fresh gas sucked by means of blowers 9 via cross-flow heat exchanger 10 in sections 11 provided above the drying channel 2 flow channel and by a heating coil 12 between the two input-side drying zones 4, 5th is blown into the drying channel 2, so that in the drying zone 4 a drying gas flow against the conveying direction 8 and in the drying zone 5 form a drying gas flow in the conveying direction.
  • the exiting from the stacks 3, loaded with the absorbed wood moisture exhaust gas streams are fed back to the cross-flow heat exchanger 10 via sections 13 of the flow channel above the drying channel 2 to be excreted in the drying process discharged their sensible waste heat to the fresh air sucked. Since the fresh gas has a low moisture content, rapid drying of the wood of the stacks 3 above the fiber saturation can be carried out with the aid of the fresh gas streams in the two input-side drying zones 4, 5. To speed up the drying process, the fresh gas can be moderately heated via the heating register 12. The stacking depth of the drying zone 4 is small in order not to slow the drying by the moisture absorbed by the fresh gases wood moisture.
  • the drying rate can be kept high due to the low moisture of the fresh gases supplied, with the advantage that due the relatively low temperatures of the drying gas streams, the drying rate for woods with a high moisture content fails greater than for woods with a low moisture content.
  • a compensation of the different moisture content of the woods in a stack 3 can be introduced in an advantageous manner with regard to the requirement that the final moisture of all the woods of a stack 3 at the exit of the drying tunnel 2 has a uniform value.
  • the moisture content of the drying air is increased in the conveying direction due to the recorded wood moisture, whereby the drying rate is increasingly lowered and a gentle for the drying course of wood can be set for a further compensation of the different moisture of the individual woods in provides the stacks 3.
  • the stacking depth in the drying zone 5 is correspondingly increased compared to that of the drying zone 4.
  • drying gas is circulated in the drying zone 6 over a section 14 of the flow channel above the drying channel 2, with the aid of a blower 15. The moisture and the temperature of this at least partially circulated drying gas flow can be adjusted according to the respective requirements.
  • a heating coil 12 and on the other hand a device 16 is provided, through which a part of the drying gas flow can be eliminated from the circuit and replaced by fresh gas, so that the moisture of the drying zone 6 supplied drying gas by a mixture of comparatively dry fresh gas with the moist drying gas from the drying zone 6 can be adjusted.
  • the woods After drying the wood of the stack 3 to below the fiber saturation, the woods are dried in an exit-side drying zone 7 to the required final moisture, which must be done gently.
  • the stacking depth of this output-side drying zone 7 is also chosen to be significantly higher than that of the preceding drying zones 5, 6.
  • the conditioning of the drying zone 7 supplied drying gas flow on the one hand again via a heating coil 12 and on the other hand via a separation of a partial stream of the drying gas and a replacement of the excreted drying gas by fresh gas.
  • the circulation flow is maintained by a fan 15 in a portion 17 of the flow channel above the drying channel 2.
  • control of the gas exchange is carried out by means of control valves 18. This represents a design difference with regard to the control of the fresh gas supply in the region of the drying zone 6, because in the device 16, the partial separation of drying gas and the fresh gas supply is made by separate blower.
  • a countercurrent heat exchanger 19 is used in order to use the fillable waste heat of the excreted exhaust gases for preheating the fresh gases, which is not required in the region of the exit-side drying zone 7.
  • the wood stacks 3 are conveyed at a corresponding depth of a stack 3 conveying step at predetermined periods, the output side wood stack 3 of the drying zone 7 taken via an outlet 20 of the device and a new stack through an inlet 21 of the drying zone 4th is abandoned.
  • B. fresh softwood which has within a stack a moisture content of the individual woods between 30% and 200% to a predetermined final moisture, for example between 6% and 20% to dry.
  • the temperature of the drying gases in the area of the input side Drying gases in the region of the input-side drying zones 4, 5 is preferably 30 to 50 ° C and is raised to 65 to 80 ° C in the drying zones 6 and 7.

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

Abstract

L'invention concerne un procédé de séchage de bois assemblé sous forme de piles, séché au cours d'un transport par étapes de piles au travers d'un canal de séchage, au moyen de flux gazeux de séchage opposés, dans des zones de séchage consécutives, jusqu'à atteinte d'une humidité finale inférieure à la saturation des fibres, la profondeur d'empilement des zones de séchage, définie par le nombre de piles de bois mises en rangées les unes derrière les autres dans le sens de transport, augmentant dans le sens de transport. L'invention vise à obtenir une humidité finale uniforme malgré la présence d'humidités de bois initiales différentes, avec une utilisation d'énergie relativement faible et des vitesses de séchage avantageuses. A cet effet, le bois est séché dans deux zones de séchage côté entrée, essentiellement au moyen de gaz frais introduit entre ces zones de séchage, jusqu'à atteinte d'une humidité située dans le domaine de saturation des fibres, cependant bien au-dessus de la saturation des fibres, puis séché dans au moins une zone de séchage ultérieure à l'aide d'un flux de gaz de séchage dont la température et l'humidité peuvent être réglées, au moins partiellement guidé en circuit, jusqu'à atteinte de l'humidité finale.

Claims (3)

  1. Procédé de séchage de bois assemblé en piles (3), séché pendant un transport par étapes de piles au travers d'un canal de séchage (2) au moyen de flux gazeux de séchage opposés, dans des zones de séchage (4, 5, 6, 7) consécutives, tout d'abord à une teneur en humidité située dans le domaine de saturation des fibres, cependant, essentiellement au-dessus de la saturation des fibres et puis, au moins dans une autre zone de séchage à l'aide d'un flux gazeux de séchage dont la température et l'humidité peuvent être réglées, au moins partiellement guidé en circuit, à une humidité finale en-dessous de la saturation des fibres, la profondeur d'empilement, définie par le nombre de piles de bois mises en rangées les unes derrière les autres dans le sens de transport, des zones de séchage, augmentant dans le sens de transport (8), caractérisé en ce que le bois est séché dans deux zones de séchage (4, 5) côté entrée, au moins essentiellement avec du gaz frais introduit entre ces zones de séchage.
  2. Procédé selon la revendication 1, caractérisé en ce que le gaz frais est réchauffé après un préchauffage, dans l'échangeur thermique, avec l'effluent gazeux, en provenance de la zone de séchage (4, 5) chargée en gaz frais, par au moins un registre de chauffe (12) avant d'être conduit à la zone de séchage (4, 5).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le bois est séché dans une zone intermédiaire (6) prévue entre la zone de séchage (7) traversée dans le sens de transport, côté sortie et les deux zones de séchage (4, 5) côté entrée, à l'aide d'un flux gazeux de séchage, dont la température et l'humidité peuvent être réglées, au moins partiellement guidé en circuit, à une teneur en humidité essentiellement en-dessous de la saturation des fibres.
EP07845262A 2006-11-21 2007-11-14 Procédé de séchage de bois assemblé sous forme de piles Not-in-force EP2092258B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0192106A AT504578B1 (de) 2006-11-21 2006-11-21 Verfahren zum trocknen von in stapeln zusammengefasstem holz
PCT/AT2007/000516 WO2008061264A2 (fr) 2006-11-21 2007-11-14 Procédé de séchage de bois assemblé sous forme de piles

Publications (2)

Publication Number Publication Date
EP2092258A2 EP2092258A2 (fr) 2009-08-26
EP2092258B1 true EP2092258B1 (fr) 2011-07-27

Family

ID=39430075

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07845262A Not-in-force EP2092258B1 (fr) 2006-11-21 2007-11-14 Procédé de séchage de bois assemblé sous forme de piles

Country Status (3)

Country Link
EP (1) EP2092258B1 (fr)
AT (2) AT504578B1 (fr)
WO (1) WO2008061264A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108433367A (zh) * 2018-02-27 2018-08-24 赵桂香 一种防潮木板存储装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT510007B1 (de) * 2010-12-07 2012-01-15 Muehlboeck Kurt Verfahren zur holztrocknung
DE102018206629A1 (de) * 2018-04-27 2019-10-31 Lavatec Laundry Technology Gmbh Trockner und Verfahren zum Betrieb eines Trockners

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2087454A (en) * 1932-02-25 1937-07-20 Moore Dry Kiln Co Apparatus for kiln drying
GB812042A (en) * 1956-09-06 1959-04-15 Svenska Flaektfabriken Ab Drier for wallboard and similar sheet-like materials
DE1294888B (de) * 1961-10-25 1969-05-08 Ewemaskiner Ab Verfahren und Vorrichtung zum Trocknen von Holz
US3422545A (en) * 1966-07-08 1969-01-21 Nukor Proprietary Ltd Timber drying process and apparatus
SE368740B (fr) * 1966-08-22 1974-07-15 Svenska Flaektfabriken Ab
AT335918B (de) * 1974-07-11 1977-04-12 Vanicek Viktor Trocknungsanlage, insbesondere trocknungskanal
FI98092B (fi) * 1988-09-27 1996-12-31 Valmet Paper Machinery Inc Menetelmä puutavaran kuivaamiseksi
AT412741B (de) * 2001-12-10 2005-06-27 Muehlboeck Kurt Verfahren zum trocknen von gestapeltem holz
US6988545B2 (en) * 2003-01-27 2006-01-24 Harold Max Good Heat exchanger systems
US7194822B2 (en) * 2004-05-11 2007-03-27 American Wood Dryers, Inc. Systems for drying moisture-containing work pieces and methods for drying same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108433367A (zh) * 2018-02-27 2018-08-24 赵桂香 一种防潮木板存储装置

Also Published As

Publication number Publication date
WO2008061264A3 (fr) 2008-09-18
ATE518106T1 (de) 2011-08-15
AT504578B1 (de) 2009-11-15
WO2008061264A2 (fr) 2008-05-29
AT504578A1 (de) 2008-06-15
EP2092258A2 (fr) 2009-08-26

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