EP1607703A2 - Chambre de séchage du bois - Google Patents

Chambre de séchage du bois Download PDF

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Publication number
EP1607703A2
EP1607703A2 EP04445111A EP04445111A EP1607703A2 EP 1607703 A2 EP1607703 A2 EP 1607703A2 EP 04445111 A EP04445111 A EP 04445111A EP 04445111 A EP04445111 A EP 04445111A EP 1607703 A2 EP1607703 A2 EP 1607703A2
Authority
EP
European Patent Office
Prior art keywords
chamber
drying
timber
drying chamber
conditioning
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.)
Withdrawn
Application number
EP04445111A
Other languages
German (de)
English (en)
Inventor
Aarno Tuomola
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.)
WSAB FINLAND Oy
Original Assignee
WSAB FINLAND Oy
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 WSAB FINLAND Oy filed Critical WSAB FINLAND Oy
Publication of EP1607703A2 publication Critical patent/EP1607703A2/fr
Withdrawn legal-status Critical Current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 for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/20—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
    • F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying goods
    • F26B2210/16—Wood, e.g. lumber, timber

Definitions

  • the present invention relates to a travelling timber dryer that includes a drying chamber which is delimited by a first end wall and an opposite second end wall and which forms a passageway that has at least one timber drying zone in which timber, or wood, is dried with the aid of a drying atmosphere, wherein timber stacks consisting of at least one timber pack on a conveyer path are fed into the drying chamber through a first port in the first end wall, thereafter moved through the drying chamber and then exited through a second port in said opposing end wall.
  • a conditioning zone is sometimes integrated in the drying chamber.
  • This conditioning zone is not sufficiently effective in equalising the moisture quotient and in reducing mechanical stresses in the timber, owing to the fact that the control of the air humidity has technical limitations when this conditioning zone is not delimited to the drying climate in the remaining part of the chamber.
  • the temperature in the conditioning zone is also influenced by the temperature in the drying zone.
  • the present invention relates to a travelling dryer in which timber conditioning is effected in connection with the timber drying' process and in which the drying atmosphere and the conditioning atmosphere can be controlled independently of one another.
  • An object of the invention is to enable the dried timber to be conditioned in direct connection with the drying process, with or without intermediate storage of the timber in a buffer zone.
  • Yet another object of the invention is to provide a travelling dryer in which the timber on a conveyer path can be readily moved through both drying chamber and conditioning chamber through the medium of a conveyor path.
  • the present invention relates to a travelling timber dryer.
  • the dryer includes a drying chamber that has a first end wall and an opposite second end wall, wherein the drying chamber forms a passageway that includes at least one zone for drying said timber with the aid of a drying atmosphere.
  • the invention is characterized by a conditioning chamber which is delimited from the drying chamber and which is located in connection therewith.
  • the conditioning chamber will preferably have installed therein steaming equipment, circulation fans, an air-exchange arrangement and heating batteries. Because the conditioning zone is delimited, it can be used freely over mutually different conditioning phase durations without being dependent on the infeed cycle of the travelling dryer.
  • FIG. 1 is a diagrammatic longitudinally sectioned view of a known travelling dryer.
  • the illustrated dryer includes a drying chamber 1 in the form of a passageway that is delimited by a ceiling 2, two side walls situated respectively in front of and behind the plane of the sectioned view in figure 1, a first end wall 3 to the left of the figure, said wall including a first port through which timber, or wood is fed into the drying chamber 1, a second end wall 4 at the opposite end of the drying chamber, said second wall including a second port through which dried timber is exited from the drying chamber 1, and a floor 5 which forms or is a means for supporting a conveyor path (not shown). The conveyor path also continues beyond the end walls.
  • the conveyor path functions to move the timber so as to pass it through the first port, stepwise through the drying chamber 1, and out through the second port.
  • the timber is usually loaded on transport carriages in the form of timber stacks of mutually the same height.
  • the first and the second ports are open solely during the infeed and outfeed of timber respectively.
  • Each timber group 6, 7 consists of a number of stacks of timber, for instance five stacks 6a-6e and five stacks 7a-7e respectively, as shown in fig. 1.
  • the timber groups 6, 7 may have mutually different lengths (in the longitudinal directions of the chamber) and thus do not consist of the same number of stacks.
  • a timber stack consists of at least one timber pack, often three timber packs, as shown in figure 1.
  • the timber stacks within a timber group 6, 7 are disposed at a short distance apart, in practice next to one another.
  • the timber groups 6, 7 are spaced relatively wide apart and also relatively far from the end walls 3, 4.
  • All timber packs, and therewith all timber stacks have mutually the same width, by width being meant the extension of the packs at right angles to the direction in which the timber moves through the drying chamber 1.
  • the width of the packs is such as to enable them to move through the drying chamber I with a small clearance to the side walls.
  • the drying chamber 1 also includes a respective first and second horizontal delimitation 8 and 9. These delimitations 8, 9 are located at a small distance above respective timber groups 6, 7 and have essentially the same length as the timber groups in the transporting direction of the timber and essentially the same width extension between the side walls.
  • first heating batteries 10 for heating of the timber drying atmosphere.
  • second heating batteries 11 are provided above the second timber group 7, between the ceiling 2 of the drying chamber 1 and the second horizontal delimitation 9.
  • the drying chamber I includes in the ceiling 2 two inlet ports 12 and 13 for fresh drying atmosphere, between the first heating batteries 10 and the first end wall 3 and between the second heating batteries 11 and the second end wall 4 respectively, these ports being provided with a butterfly valve. Also provided is an outlet port 20 for spent drying atmosphere between the first end wall 3 and the first inlet port 12.
  • a first group of fans or blowers 14 are mounted above the first delimitation 8, between the first inlet port 12 and the first heating batteries 10.
  • a second group of fans or blowers 15 are disposed above the second delimitation 9, between the second inlet port 13 and the second heating batteries 11.
  • sensors 16a, 16b and 17a, 17b for measuring the dry temperature of the drying atmosphere above the first delimitation 8 and the second delimitation 9, and also with sensors 18a, 18b and 19a, 19b for measuring the wet temperature of the drying atmosphere above the first delimitation 8 and the second delimitation 9 respectively.
  • Drying atmosphere is introduced through the inlet ports 12 and 13 during the timber drying process.
  • the drying atmosphere is driven by the fans or blowers 14 and 15 through the respective heating units 10 and 11, so as to form an overpressure in the space located between the timber groups 6, 7.
  • the temperature and relative humidity of the atmosphere are controlled as a function of the values indicated by the means for measuring the wet and the dry temperatures.
  • the drying atmosphere that has flowed through the first timber group 6 leaves the drying chamber 1 through the outlet port 20.
  • the pressure between the timber groups in the central part of the drying chamber 1 will be higher than the pressure at its ends.
  • a carriage loaded with stacks of timber is fed into the drying chamber through the port provided in the end wall 3 and takes the position referenced 6a.
  • all timber stacks Prior to this, all timber stacks have been moved one step towards the second end wall 4, to the right in the figure, and the timber stack 7E nearest the end wall 4 has been exited through the port in the second end wall 4. Drying of this timber stack has been completed and the stack shall now be conditioned for equalising stresses in the timber. All positions in the drying chamber are fixed.
  • FIG 2 is a diagrammatic illustration of a preferred embodiment of an inventive travelling dryer 40 that includes the drying chamber I of the figure 1 embodiment, a conditioning chamber 70 and a temporary storage chamber or buffer chamber 60 located between the drying chamber 1 and the conditioning chamber 70.
  • the drying chamber 1, the buffer chamber 60 and the conditioning chamber 70 will all preferably have mutually the same width and height and therewith form a continuous passage delimited by walls, such as end walls in respect of the drying chamber 1 and the conditioning chamber 70.
  • the three chambers will normally have mutually different lengths.
  • a conveyor path moves through said three chambers.
  • the conditioning chamber 70 includes a ceiling 72, two side walls, one in front and one behind the sectioned view of figure 2, a third end wall 73 to the left of the figure, said third end wall including a third port through which timber is fed into the conditioning chamber 70, a fourth end wall 74 located at the opposite end of the conditioning chamber 70 and including a fourth port through which conditioned timber is exited from the conditioning chamber 70 into a closed buffer zone, or exited directly from the dryer, and a floor 75 which forms or is means for supporting a conveyor path (not shown).
  • This conveyor path is an extension of the conveyor path from the drying chamber 1 and also continues through the buffer chamber 60.
  • a timber group 76 consisting, e.g., of three timber stacks 76a-c.
  • a third horizontal delimitation 78 Located at a small height above the timber group 76 is a third horizontal delimitation 78. This delimitation has generally the same length as the timber group 76 in the direction of transportation, and extends inwardly of the side walls.
  • the conditioning chamber 70 includes means for increasing the humidity of the atmosphere.
  • the conditioning chamber 70 also includes a third inlet port 82 for fresh conditioning atmosphere, and a second outlet port 88 for spent conditioning atmosphere.
  • a third group of fans or blowers 84 is disposed above the horizontal delimitation 78, between the third inlet port 82 and the heating batteries 80.
  • a sensor 86 for measuring the dry temperature of the conditioning atmosphere and a sensor 89 for measuring the wet temperature of said atmosphere. It is also possible, of course, to measure the relative humidity of the atmosphere or some other known parameter that will provide information necessary for controlling conditioning of the timber.
  • the buffer chamber 60 is located between the drying chamber 1 and the conditioning chamber 70.
  • the ends of the buffer chamber 60 are delimited respectively by the second end wall 4 of the drying chamber and the end wall 73 of the conditioning chamber.
  • the buffer chamber is used for the intermediate storage of dried timber stacks prior to passing said stacks into the conditioning chamber 70.
  • the conditioning chamber 70 is in direct connection with the drying chamber 1.
  • the end wall 73 of the conditioning chamber 1 consists of the end wall 4 of the drying chamber. It is essential that the treatment atmosphere of the conditioning chamber is not influenced by the atmosphere in and the conditions concerning the drying chamber.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP04445111A 2004-06-16 2004-10-16 Chambre de séchage du bois Withdrawn EP1607703A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0401545 2004-06-16
SE0401545A SE0401545L (sv) 2004-06-16 2004-06-16 Vandringstork

Publications (1)

Publication Number Publication Date
EP1607703A2 true EP1607703A2 (fr) 2005-12-21

Family

ID=32710065

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04445111A Withdrawn EP1607703A2 (fr) 2004-06-16 2004-10-16 Chambre de séchage du bois

Country Status (2)

Country Link
EP (1) EP1607703A2 (fr)
SE (1) SE0401545L (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008133583A1 (fr) * 2007-04-26 2008-11-06 Valutec Ab Procédé pour une commande dynamique de la période de séchage dans un tunnel de séchage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008133583A1 (fr) * 2007-04-26 2008-11-06 Valutec Ab Procédé pour une commande dynamique de la période de séchage dans un tunnel de séchage

Also Published As

Publication number Publication date
SE0401545D0 (sv) 2004-06-16
SE0401545L (sv) 2005-12-17

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