EP0142071B1 - Procédé pour sécher le bois - Google Patents

Procédé pour sécher le bois Download PDF

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Publication number
EP0142071B1
EP0142071B1 EP84112676A EP84112676A EP0142071B1 EP 0142071 B1 EP0142071 B1 EP 0142071B1 EP 84112676 A EP84112676 A EP 84112676A EP 84112676 A EP84112676 A EP 84112676A EP 0142071 B1 EP0142071 B1 EP 0142071B1
Authority
EP
European Patent Office
Prior art keywords
air flow
wood
fans
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.)
Expired
Application number
EP84112676A
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German (de)
English (en)
Other versions
EP0142071A2 (fr
EP0142071A3 (en
Inventor
Horst Klinkmüller
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.)
Lignomat GmbH
Original Assignee
Lignomat 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 Lignomat GmbH filed Critical Lignomat GmbH
Publication of EP0142071A2 publication Critical patent/EP0142071A2/fr
Publication of EP0142071A3 publication Critical patent/EP0142071A3/de
Application granted granted Critical
Publication of EP0142071B1 publication Critical patent/EP0142071B1/fr
Expired legal-status Critical Current

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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
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/022—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure with provisions for changing the drying gas flow pattern, e.g. by reversing gas flow, by moving the materials or objects through subsequent compartments, at least two of which have a different direction of gas flow
    • F26B21/026—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure with provisions for changing the drying gas flow pattern, e.g. by reversing gas flow, by moving the materials or objects through subsequent compartments, at least two of which have a different direction of gas flow by reversing fan rotation
    • 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
    • F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
    • 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 sawn timber, in which, by means of fans driven by frequency converter-controlled three-phase motors, an air stream is passed through sawn timber layers stacked at intervals in a drying room, this air stream is conditioned by a heating and a dehumidifying device and by a predetermined reversing time Reversing the fans is reversed.
  • Dryers with which such a method can be carried out are known in isolated cases; above a drying room, which can accommodate several stacks of sawn timber layers next to each other, a fan room in which several axial fans are arranged next to each other, which are driven by three-phase motors fed by frequency converters.
  • the fan speed can be controlled by changing the frequency of the supply current, and the direction of rotation by changing the phase.
  • the air flow generated by the fans is circulated through the fan and the drying room in such a way that, with a certain direction of rotation of the fans, it exits into the drying room on one side and out of the drying room on the opposite side and then back into the Fan room to enter; the stack of sawn timber layers arranged side by side in the drying room are traversed by the air flow in the transverse direction.
  • sensors for measuring the wood equilibrium moisture and the temperature of the air flow On each side of the drying room there are sensors for measuring the wood equilibrium moisture and the temperature of the air flow; In addition, sensors for measuring the moisture content of the wood are used in some of the sawn timber, with the help of a program control device and the data recorded by the various sensors, a heating device located above one side of the drying room, through which the air flow flows when it is introduced into the drying room, spray nozzles on both Control the sides of the drying room to humidify the circulating air flow, supply air and exhaust air flaps in the ceiling of the fan room to reduce the humidity of the circulating air flow, as well as the three-phase motors of the axial fans.
  • Other dehumidifying devices can also be used to dehumidify the circulating air flow; so it is z. B.
  • the required humidification of the air stream can either be done by atomizing water through spray nozzles in the air stream or being introduced into this water vapor.
  • the invention had for its object to provide such a process control that it is possible to achieve a relatively cheap homogenization of the drying process along the path of the air flow through the sawn timber layers.
  • this object is achieved according to the invention in that the air flow is reversed after a reversing time of at most approximately 30 minutes.
  • the starting point was the knowledge that the above-described processes and disadvantages of the prior art are all the greater the longer an air flow direction is maintained; H. the longer the reversal periods are.
  • the reversing time in the method according to the invention is now only a fraction of the reversing time in known drying methods, a substantially more uniform drying can be achieved along the path of the air flow through the sawn timber layers and moisture transport from one side to the other of the sawn timber stack and back is largely avoided , so that using the method according to the invention requires less energy and shorter drying times.
  • the air flow is reversed when the wood equilibrium moisture content on the exhaust air side of the sawn timber piles reaches a value which is approximately 1% higher than the value measured on the supply air side, and / or when the temperature of the air flow on the Exhaust air side has dropped more than approx. 2 ° C below the temperature on the supply air side.
  • the aim is to avoid laminar flow conditions as much as possible by repeatedly bringing the fans to the operating speed and then stopping them again within a reversing time period and thus generating a pulsating air flow.
  • the duration of an air flow pulse is expediently chosen so that the fans are braked again when a laminar air flow begins to form between the sawn timber layers.
  • the speed of drying wood naturally depends on the type of wood and the thickness of the lumber; with slow-drying types of wood, the moisture takes more time to diffuse through the wood, and with thicker sawn timber it takes longer for the moisture from the core of the sawn timber to reach its surface.
  • slow drying types of wood and thicker lumber ! - r drying air, because the surfaces of the lumber layers have already dried, but the moisture from the inside of the lumber does not reach its surface quickly enough
  • drying slow-drying types of wood or thicker sawn timber it is advisable to allow a pause between the airflow pulses during which the fans are stopped. The slower a type of wood dries and the thicker the sawn timber, the longer you will choose this break time.
  • FIG. 1 shows a dryer 10 with a housing, which encloses a drying chamber 12 and a fan chamber 14 arranged above it.
  • the dimensions of the dryer which lie in the drawing plane of FIG. 1, should be the width and height of the dryer.
  • three stack of sawn timber layers 16, 18 and 20 are arranged side by side, which extend in the longitudinal direction of the dryer and whose sawn timber layers 22 are stacked on top of one another in such a way that there are intermediate spaces 24 which extend in the transverse direction through the respective sawn timber stack.
  • each of the side walls 26, 28 of the dryer 10 Arranged on the inside of each of the side walls 26, 28 of the dryer 10 are at least one temperature sensor 30 for measuring the air temperature and one moisture sensor 32 for measuring the so-called wood equilibrium moisture Ug 1 (as is known, the wood equilibrium moisture content is a function of the air humidity);
  • wood moisture sensors 34 are used in various layers of lumber, with which the actual wood moisture can be measured.
  • the fan chamber 14 has a base 38 which separates it from the drying chamber 12, and a vertical transverse wall 40 which divides the fan chamber 14 into two chambers and which has a plurality of openings 42 for receiving an axial fan 44 in each case.
  • Three-phase motors 46 are used to drive the fans.
  • the flaps 50 which can be pivoted about rectified axes 56, are all coupled to one another via a linkage 58.
  • a servomotor 62 acts on this linkage 58, as a result of which all the flaps 50 can be opened and closed.
  • Air passage openings 66 are provided between the floor 38 of the fan chamber 14 and the side walls 26 and 28, a heating device 68 being arranged in at least one of these passage openings, which can be an electric heating device operated with hot steam or a heat transfer oil.
  • humidification devices 70 are arranged beneath the passage openings 66 along both side walls 26, 28, through which water can be sprayed and atomized into the drying room 12 or low-pressure saturated steam can be introduced into the drying room.
  • the block diagram shown in FIG. 1 shows a three-phase source 100 for supplying the three-phase motors 46 via a frequency converter 102, by means of which the speed of the three-phase motors 46 can be controlled by changing the frequency of the three-phase current fed in; In addition, the phase of the three-phase current and thus the direction of rotation of the three-phase motors 46 can be changed by the frequency converter 102.
  • Such frequency converters are available on the market, so that their structure and mode of operation need not be described in detail.
  • the frequency converter 102 is controlled by a pulse programmer 104, by means of which the reversing time segments, the air flow pulses and the pause times are predetermined for the frequency converter 102. This will expediently be a microprocessor.
  • a control system 106 is provided, which is via a control line 108 and others controls the pulse programmer 104. This in turn is connected via a control line 110 to the frequency converter 102, which feeds the three-phase motors 46 via lines 112, 112a, 112b, 112c.
  • the control system 106 is also expediently a microprocessor with a first input 114, via which data relating to the type of wood to be dried can be entered into the control system nen.
  • a multi-channel input 116 is connected to the various wood moisture sensors 34 via a multi-channel line 116a, two inputs 118 and 120 via lines 118a and 120a to the moisture sensors 32 and two inputs 122 and 124 via lines 122a and 124a to the temperature sensors 30.
  • the control system 106 controls the heating device 68 via an output 126 and a control line 128, and a multi-channel output 130, together with a multi-channel control line 132, serves to control the humidification devices 70 and the servomotor 62 for the flaps 50.
  • Fig. 1 the area of the drying room 12, which is to the left of the lumber stack 16, 18, 20, was designated "A”, the area to the right of it was designated “B”, while the path of the air flow through the lumber stack through a Double arrow C was indicated.
  • FIG. 2 shows a diagram for a first type of process control with the representation of the speed of the fans 44 as a function of time. It should be assumed that the airflow is directed from A to B during three airflow pulses 140 and the reversing time z. B. is 15 minutes. This is followed by three air flow pulses 142 with air flow directed from B to A. The edges 140a of the airflow pulses should only be so steep that the current consumption of the fans 44 during acceleration to the working or nominal speed does not lead to undesired current peaks and in particular does not exceed the nominal or full-load current. Between the air flow pulses 140 and 142, the fans stand still for a certain time (pause time), which is chosen the longer, the slower the type of wood in question dries and the thicker the sawn timber.
  • pause time which is chosen the longer, the slower the type of wood in question dries and the thicker the sawn timber.
  • Fig. 3 shows a corresponding diagram for a very fast drying type of wood. As a result, pause times between the airflow pulses 140 and 142 are not required.
  • FIG. 4 shows a diagram for a corresponding procedure with air flow pulses 144, during which the air flow is directed from A to B, and air flow pulses 146, during which the air flow is directed from B to A.
  • the periods during which the fans 44 are switched on are expediently increased.

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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)

Claims (7)

1. Procédé de séchage de bois de coupe, selon lequel des ventilateurs entraînés par des moteurs triphasés commandés par des convertisseurs de fréquences font passer un courant d'air au travers de couches de bois de coupe empilées l'une sur l'autre avec espacement dans un volume de séchage, ce courant d'air est conditionné par un dispositif de chauffage ainsi qu'un dispositif de déshumidification et est respectivement inversé, au bout d'une période d'alternance prédéterminée, par inversion des ventilateurs, caractérisé en ce que le courant d'air est inversé au bout d'un temps d'alternance au maximum d'environ 30 minutes.
2. Procédé selon la revendication 1, caractérisé en ce que le temps d'alternance est compris entre environ 10 et environ 20 minutes.
3. Procédé selon une des revendications 1 ou 2, caractérisé en ce que les ventilateurs, à l'intérieur d'une période d'alternance, sont portés plusieurs fois à une vitesse de travail et ensuite à nouveau immobilisés de façon à produire ainsi un courant d'air pulsé.
4. Procédé selon la revendication 3, caractérisé en ce que, entre les impulsions de courant d'air, il est prévu respectivement un temps de pause pendant lequel les ventilateurs sont immobilisés.
5. Procédé selon la revendication 4, caractérisé en ce que pour des bois séchant lentement et pour des bois de coupe assez épais, on choisit le temps de pause plus long que pour des bois séchant rapidement et pour des bois de coupe plus minces.
6. Procédé selon une des revendications 3 à 5, caractérisé en ce que la longueur d'une impulsion de courant d'air est au maximum approximativement égale à la durée de la période pendant laquelle, après l'enclenchement des ventilateurs, il s'établit un écoulement laminaire entre les couches de bois de coupe.
7. Procédé selon une des revendications 3 à 5, caractérisé en ce que, à mesure que le séchage du bois progresse, les intervalles de temps pendant lesquels les ventilateurs sont enclenchés sont augmentés.
EP84112676A 1983-11-09 1984-10-20 Procédé pour sécher le bois Expired EP0142071B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833340489 DE3340489A1 (de) 1983-11-09 1983-11-09 Verfahren zum trocknen von schnittholz
DE3340489 1983-11-09

Publications (3)

Publication Number Publication Date
EP0142071A2 EP0142071A2 (fr) 1985-05-22
EP0142071A3 EP0142071A3 (en) 1986-02-19
EP0142071B1 true EP0142071B1 (fr) 1988-12-14

Family

ID=6213848

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84112676A Expired EP0142071B1 (fr) 1983-11-09 1984-10-20 Procédé pour sécher le bois

Country Status (3)

Country Link
EP (1) EP0142071B1 (fr)
DE (2) DE3340489A1 (fr)
FI (1) FI844403L (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006104447A1 (fr) 2005-04-01 2006-10-05 Coldbay Ab Procede de sechage du bois
DE102015110750A1 (de) 2014-07-07 2016-01-07 Hildebrand Holztechnik Gmbh Trocknungsvorrichtung
EP3190370A1 (fr) 2016-01-05 2017-07-12 Hildebrand Holztechnik GmbH Dispositif de séchage

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2604245B1 (fr) * 1986-09-19 1988-12-23 Gautreau Jean Paul Procede de sechage de produits hygroscopiques de fortes epaisseurs, notamment du bois.
AT403734B (de) * 1987-04-01 1998-05-25 Vanicek Friedrich Anordnung von axialventilatoren für holztrocknungsanlagen
DE3717659A1 (de) * 1987-05-26 1988-12-15 Brunner R Messtechmik Verfahren und vorrichtung zum trocknen von schnittholz
GR1000897B (el) * 1990-01-16 1993-03-16 Michalis Tsamparlis Υβριδικο ξηραντηριο φρουτων και λαχανικων.
US5588830A (en) * 1995-01-13 1996-12-31 Abb Paint Finishing, Inc. Combined radiant and convection heating oven
FI974466A0 (fi) * 1997-12-09 1997-12-09 Stellac Oy Foerfarande foer reglering av gascirkulation
FR2787179B1 (fr) * 1998-12-11 2001-01-19 Equip Tech Ind Alimentaires Procede de thermisation de produits convoyes avec circulation alternee du gaz thermisant
AT407797B (de) * 1999-01-29 2001-06-25 Theodor Dr Vanicek Trocknungsanlage
FR2790698B1 (fr) * 1999-03-09 2001-07-06 Jean Laurencot Dispositif pour le traitement thermique a haute temperature d'une matiere ligneuse
FR2805769B1 (fr) * 2000-03-01 2002-05-31 Realisation De Travaux Electr Procede de sechage de bois et dispositif pour sa mise en oeuvre
FR2846269B1 (fr) * 2002-10-28 2004-12-24 Jean Laurencot Procede pour traiter une charge de matiere ligneuse composee d'elements empiles, notamment une charge de bois, par traitement thermique a haute temperature
FR2914734B1 (fr) * 2007-04-05 2010-06-11 Innovation Technologique Pour Procede pour le sechage de bois et dispositif pour sa mise en oeuvre
TR200903273A2 (tr) 2009-04-27 2010-09-21 Levent Yalcin Fırınlama ve kurutma sistemi.
ITBZ20090054A1 (it) * 2009-12-09 2011-06-10 Renzo Nardi Procedimento e dispositivo per ottenere un risparmio energetico durante l'essicazione artificiale dei legnami

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH272890A (de) * 1948-07-30 1951-01-15 Stoggl Hans Verfahren und Einrichtung zum Trocknen von Schnittholz.
US3131034A (en) * 1961-03-02 1964-04-28 Marsh Julius Everett Process for drying lumber
DE1604935A1 (de) * 1966-12-02 1971-01-14 Robert Hildebrand Trockenkammer,insbesondere fuer das Trocknen von Schnittholz
US3714716A (en) * 1970-06-29 1973-02-06 Weyerhaeuser Co Process for kiln drying lumber by means of a predetermined drying rate
IT1071276B (it) * 1976-05-12 1985-04-02 Pagnozzi Ernesto Guglielmo Perfezionamenti nei procedimenti e negli impianti di essiccazione del legname..particolarmente negli impianti che impiegano il vuoto

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006104447A1 (fr) 2005-04-01 2006-10-05 Coldbay Ab Procede de sechage du bois
EP1864066A1 (fr) * 2005-04-01 2007-12-12 Coldbay AB Procede de sechage du bois
EP1864066A4 (fr) * 2005-04-01 2014-04-16 Coldbay Ab Procede de sechage du bois
DE102015110750A1 (de) 2014-07-07 2016-01-07 Hildebrand Holztechnik Gmbh Trocknungsvorrichtung
EP2966389A1 (fr) 2014-07-07 2016-01-13 Hildebrand Holztechnik GmbH Dispositif de sechage
DE102015110750B4 (de) 2014-07-07 2021-12-09 Hildebrand Holztechnik Gmbh Trocknungsvorrichtung
EP3190370A1 (fr) 2016-01-05 2017-07-12 Hildebrand Holztechnik GmbH Dispositif de séchage

Also Published As

Publication number Publication date
EP0142071A2 (fr) 1985-05-22
EP0142071A3 (en) 1986-02-19
DE3340489A1 (de) 1985-08-14
FI844403L (fi) 1985-05-10
DE3475648D1 (en) 1989-01-19
FI844403A0 (fi) 1984-11-08

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