EP0170648A1 - Procédé de séchage de produits délicats, p.ex. du bois - Google Patents

Procédé de séchage de produits délicats, p.ex. du bois Download PDF

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Publication number
EP0170648A1
EP0170648A1 EP19850890167 EP85890167A EP0170648A1 EP 0170648 A1 EP0170648 A1 EP 0170648A1 EP 19850890167 EP19850890167 EP 19850890167 EP 85890167 A EP85890167 A EP 85890167A EP 0170648 A1 EP0170648 A1 EP 0170648A1
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EP
European Patent Office
Prior art keywords
drying
dried
air
temperature
condensation
Prior art date
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Application number
EP19850890167
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German (de)
English (en)
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EP0170648B1 (fr
Inventor
Josef Leisser
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Publication of EP0170648A1 publication Critical patent/EP0170648A1/fr
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    • 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
    • F26B21/08—Humidity
    • F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/04—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour circulating over or surrounding the materials or objects to be dried

Definitions

  • the invention relates to a method for drying sensitive goods, e.g. Wood in which the material to be dried is heated in a drying chamber and dried by circulating drying air from which the moisture is removed by condensation drying.
  • sensitive goods e.g. Wood
  • the material to be dried is heated in a drying chamber and dried by circulating drying air from which the moisture is removed by condensation drying.
  • the drying air is heated to the drying temperature, after which this air is circulated in the drying chamber until the drying air is enriched with moisture; this moisture is then deposited on a cooled surface by condensation.
  • moisture is supplied to the drying air in a controlled manner in order to be able to use high drying temperatures without damaging the material to be dried.
  • the moisture extracted from the material to be dried is also separated out by condensation on cooled surfaces.
  • a drying process is known in which the drying air is kept at a constant, low temperature and is dried by a dehumidifier.
  • the goods are dried at a temperature of around 30 ° C, with the moisture content of the drying air being controlled accordingly so as not to fall below a lower limit value, since otherwise the surface may become clogged.
  • the temperature of the material to be dried is essentially the same as the temperature of the drying air.
  • the invention has for its object a method to create the type mentioned in which the material to be dried can be dried quickly and gently at high temperatures.
  • this object is achieved in that the material to be dried is heated to the drying temperature, then the temperature of the drying air is reduced below that of the material to be dried, after which condensation drying of the drying air is then started. It is thereby achieved that the outer layers of the material to be dried are always cooler than the inner layers, as a result of which an increase in the relative humidity of the material to be dried occurs to the outside, thereby avoiding cracking of the outer layers, the "formwork" of the wood. As a result, the relative air humidity of the drying air can be kept lower, since the material to be dried itself contains the necessary moisture on the outer layer, as a result of which a faster drying process is achieved. In addition, the lower relative humidity of the drying air prevents the surface of the material to be stained.
  • the temperature of the drying air can be reduced by controlled supply of cool fresh air, which enables the temperature to be reduced without the use of energy.
  • the temperature of the drying air can be reduced to a value which is approximately 5 - 10 ° C below the temperature of the material to be dried, whereby a particularly effective temperature gradient is achieved.
  • the latter can be left to act on the material to be dried without condensation drying until the relative humidity of the drying air has risen to approximately 90-95%, after which the drying air is then condensed to be dried, in particular by passing it on cool condensation surfaces until the relative air humidity has dropped to about 50-60%, whereupon the condensation drying is interrupted until the relative air humidity of the drying air has risen again to about 90-95%, after which the condensation drying is started again what cycles until the desired degree of drying of the material to be dried is repeated.
  • This intermittent mode of operation allows the fans for the air circulation to be switched off with moisture during the enrichment phase of the drying air, which results in the desired energy saving.
  • the material to be dried can be returned to the initial temperature, e.g. 80 ° C, heated and the drying process is repeated until the material to be dried has the desired moisture content, whereby the drying is always kept in the desired range of moisture release.
  • the drying chamber 1 has well-insulated walls 2 provided with a vapor barrier. Air circulation channels 4 are left free in the wood stack 3. Air circulation channels 5 are provided above the wood stack 3, with which the drying air is guided to the back of the wood stack 3 facing away from the fans 6. 6 heating registers 7 and a cooling register 8 are arranged in front of the fans in the flow direction of the drying air. Below the cooling register 8, a condensate collecting channel 9 and a condensate drain 10 connected to it are provided. The cooling register 8 can be supplied with cool fresh air via fans 11. The cooling register 8 has channels 12 to which fresh air can be applied and channels 13 through which the drying air flows and separated from the channels 12. A hygrometer and a thermal sensor for controlling the fans and registers are also not shown in the chamber
  • the fans 6 are arranged below the ceiling on the upper edge of the front of the stack, the number being chosen so that a corresponding air flow is achieved over the entire width of the chamber.
  • the heating register 7 are also distributed over the chamber width. Also the cooling coil extends over the entire width of the chamber, a uniform conditioning of the TOTAL - to achieve th drying air flow.
  • the wood stacking depth should not exceed 2.50 m, since otherwise the air's willingness to absorb water from the wood would be different in the front and rear stacking areas and color errors or cracks could occur.
  • the chamber can be loaded using a forklift or trolley.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)
EP19850890167 1984-07-26 1985-07-25 Procédé de séchage de produits délicats, p.ex. du bois Expired EP0170648B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2424/84 1984-07-26
AT242484A AT385840B (de) 1984-07-26 1984-07-26 Verfahren zur trocknung von empfindlichen guetern, z. b. holz

Publications (2)

Publication Number Publication Date
EP0170648A1 true EP0170648A1 (fr) 1986-02-05
EP0170648B1 EP0170648B1 (fr) 1988-08-31

Family

ID=3534101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850890167 Expired EP0170648B1 (fr) 1984-07-26 1985-07-25 Procédé de séchage de produits délicats, p.ex. du bois

Country Status (4)

Country Link
EP (1) EP0170648B1 (fr)
AT (1) AT385840B (fr)
CS (1) CS271318B2 (fr)
DE (1) DE3564736D1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2604245A1 (fr) * 1986-09-19 1988-03-25 Gautreau Jean Paul Procede de sechage de produits hygroscopiques de fortes epaisseurs, notamment du bois.
US5228209A (en) * 1991-03-23 1993-07-20 Reinhard Brunner Apparatus for drying out wood
US5595000A (en) * 1995-01-17 1997-01-21 U.S. Natural Resources, Inc. No-vent dry kiln
WO1998045653A1 (fr) * 1997-04-09 1998-10-15 Pohjois-Suomen Kuivausteknikka Oy Procede et appareil permettant d'extraire l'humidite et/ou la moisissure de la structure d'un batiment
WO1999023430A1 (fr) 1997-11-04 1999-05-14 Plestenjak Joze Dispositif de sechage
FR2781180A1 (fr) * 1998-07-17 2000-01-21 Fours Et Bruleurs Rey Reacteur de retification du bois
FR2919921A1 (fr) * 2007-08-06 2009-02-13 Groupe Solu Allience Sarl Dispositif pour le pre-sechage artificiel des bois
WO2015068126A1 (fr) 2013-11-06 2015-05-14 Innovative Wood Drying & Consulting Amenda Stanislaw Système de séchage, en particulier pour le séchage du bois et procédé de séchage dans un tel système
CN105268612A (zh) * 2015-11-20 2016-01-27 中机中联工程有限公司 一种水性漆烘干系统及烘干方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT405331B (de) * 1997-02-03 1999-07-26 Eisbaer Air Tec Entfeuchtungst Verfahren zum trocknen von gegenständen und stoffen mittels luft
AT408575B (de) * 1997-10-07 2002-01-25 Wolf Systembau Gmbh & Co Kg Verfahren zum dielektrischen trocknen von holz

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE823280C (de) * 1949-08-27 1951-12-03 Otto Kiefer Dipl Kfm Selbsttaetige Frisch- und Abluftsteuerung bei Trocknern mit Trockentemperaturen ueber100íÒC, insbesondere zum Trocknen von Holz
DE2457654B2 (de) * 1973-12-18 1976-09-23 Pretema AG, Birmensdorf, Zürich (Schweiz) Verfahren zum trocknen hygroskopischer gueter mit faserstruktur wie holz und karton

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE823280C (de) * 1949-08-27 1951-12-03 Otto Kiefer Dipl Kfm Selbsttaetige Frisch- und Abluftsteuerung bei Trocknern mit Trockentemperaturen ueber100íÒC, insbesondere zum Trocknen von Holz
DE2457654B2 (de) * 1973-12-18 1976-09-23 Pretema AG, Birmensdorf, Zürich (Schweiz) Verfahren zum trocknen hygroskopischer gueter mit faserstruktur wie holz und karton

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2604245A1 (fr) * 1986-09-19 1988-03-25 Gautreau Jean Paul Procede de sechage de produits hygroscopiques de fortes epaisseurs, notamment du bois.
US5228209A (en) * 1991-03-23 1993-07-20 Reinhard Brunner Apparatus for drying out wood
US5595000A (en) * 1995-01-17 1997-01-21 U.S. Natural Resources, Inc. No-vent dry kiln
WO1998045653A1 (fr) * 1997-04-09 1998-10-15 Pohjois-Suomen Kuivausteknikka Oy Procede et appareil permettant d'extraire l'humidite et/ou la moisissure de la structure d'un batiment
WO1999023430A1 (fr) 1997-11-04 1999-05-14 Plestenjak Joze Dispositif de sechage
FR2781180A1 (fr) * 1998-07-17 2000-01-21 Fours Et Bruleurs Rey Reacteur de retification du bois
WO2000004328A1 (fr) * 1998-07-17 2000-01-27 Fours Et Bruleurs Rey Reacteur de retification du bois
FR2919921A1 (fr) * 2007-08-06 2009-02-13 Groupe Solu Allience Sarl Dispositif pour le pre-sechage artificiel des bois
WO2015068126A1 (fr) 2013-11-06 2015-05-14 Innovative Wood Drying & Consulting Amenda Stanislaw Système de séchage, en particulier pour le séchage du bois et procédé de séchage dans un tel système
CN105268612A (zh) * 2015-11-20 2016-01-27 中机中联工程有限公司 一种水性漆烘干系统及烘干方法

Also Published As

Publication number Publication date
DE3564736D1 (en) 1988-10-06
AT385840B (de) 1988-05-25
ATA242484A (de) 1987-10-15
CS549885A2 (en) 1990-02-12
CS271318B2 (en) 1990-09-12
EP0170648B1 (fr) 1988-08-31

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