EP0592973A1 - Dispositif de séchage du bois ou d'autres matériaux solides - Google Patents

Dispositif de séchage du bois ou d'autres matériaux solides Download PDF

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Publication number
EP0592973A1
EP0592973A1 EP93116395A EP93116395A EP0592973A1 EP 0592973 A1 EP0592973 A1 EP 0592973A1 EP 93116395 A EP93116395 A EP 93116395A EP 93116395 A EP93116395 A EP 93116395A EP 0592973 A1 EP0592973 A1 EP 0592973A1
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EP
European Patent Office
Prior art keywords
boiler
cooling
cooling air
duct
wall
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.)
Granted
Application number
EP93116395A
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German (de)
English (en)
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EP0592973B1 (fr
Inventor
Reinhard Dipl.-Ing. Brunner
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Individual
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Individual
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Publication date
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/06—Chambers, containers, or receptacles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
    • 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 invention relates to a device for drying wood or other solids, consisting of a boiler for vacuum operation, in which supports for lumber stacks, a heating device and a circulating device for the drying medium are installed, a condenser and a cooling air duct, the wall of which is through a Part of the outside of the boiler is formed.
  • This device is the subject of EP 0 505 586 A1.
  • This device dries wood at negative pressure and represents a so-called vacuum dryer.
  • This consists of a pressure-resistant, hermetically lockable drying chamber with a connected vacuum pump, has a support for wood piles, is equipped with a heating device and a circulating device for a gaseous drying medium and has inside Boiler on a condenser, which is wholly or partly formed by a part of the chamber inner wall, which is cooled by a cooling air duct located on the outside of the boiler, for which that part of the chamber wall, which acts as a condenser on the inside, forms a boundary surface.
  • the cooling air duct is used to dissipate the heat of condensation, which is the moisture escaping from the wood in the form of water vapor releases during condensation to the condenser cooled to below the dew point.
  • the boiler shown in this document has no boiler insulation in its lower area under the condensation space separated by a partition wall, but fans arranged at the side, which allow cooling air to pass the boiler wall transversely to the axial direction through a channel arranged under the boiler. Since the length of the boiler is usually much greater than its width, a large number of fans must be arranged along an axis-parallel line on the boiler wall for effective cooling, which drive the cooling air along the entire length of the boiler as far as possible along the boiler walls. The purchase and arrangement of such a large number of fans is complex and expensive.
  • the present invention avoids the disadvantages of the prior art. It is the object of the invention to achieve the task of adequate cooling, in particular of the condenser, with little construction effort and with little energy input.
  • the invention consists in that the cooling air duct extends axially parallel over most of the boiler in the longitudinal direction, that the air flow in the cooling air duct runs in the longitudinal direction of the boiler and that the effective duct width is large compared to the duct height is.
  • the channel height cannot be selected close to zero, since otherwise the flow resistance of the channel becomes large without the flow speed increasing further.
  • the amount of air that can be transported per unit of time or the available heat capacity of this amount of air must at least be so high that the amount of heat generated can be absorbed by the boiler wall before temperature compensation is reached.
  • duct heights between 2 cm and 15 cm are to be selected depending on the length and diameter of the drying boiler and the overall cross section of the fans used for cooling.
  • the exact choice of the channel height within the limits mentioned also depends on the type and strength of the dry goods, ie the drying speed most favorable for this good, by means of which the required cooling capacity is predetermined.
  • a duct height is thus chosen which is so small that the air conveyed in the duct reaches a sufficiently high speed and all air sub-volumes come into contact with the boiler wall on its way, but the duct cross section is still large enough that the The amount of air conveyed per unit of time is sufficient to absorb the heat of condensation depending on the drying speed.
  • the cooling duct is widened in its course, preferably at one end, and contains fans for conveying cooling air at this widened point. This ensures that high-performance fans of conventional design can be used to convey the cooling air through the very flat duct.
  • cooling channel protruding beyond the end of the boiler is terminated by a vertical wall, in the openings of which the nozzles of the fans used to convey the cooling air can be simply mounted.
  • the boundary surface missing from the end of the boiler of the channel can be replaced by a cover attached at the top.
  • the production of the cooling channel is simple and very inexpensive if the outer wall of the cooling channel consists of sheet metal or plastic.
  • the outer wall of the cooling channel is thermally insulated or consists of a heat-insulating material. This ensures that the cooling capacity can be reduced to a small value when the fans are at rest, if no or only slight dehumidification is to take place in the current drying phase.
  • an additional condenser with a closed liquid cooling circuit is used in the drying chamber, an additional cooling device can be avoided by installing the flat heat exchanger of this additional condenser in the cooling duct.
  • the cooling duct is connected to a chimney. It is advantageous here if the cooling air duct is led beyond the fan opening to an at least 3 m high chimney, which expediently contains an adjustable air flap inside or at the upper end. When the flap is open, the wind in the chimney creates an air flow through the cooling duct, even when the fans are not running. The strength of this flow can be controlled by the flap position.
  • Another function of the fireplace is to dampen the noise generated by the cooling fans. For this purpose, it may be advantageous to line the inside of the fireplace with sound-absorbing materials. The same purpose is also achieved with a brick fireplace, for example. This makes it possible to operate drying systems in the vicinity of residential areas, since economical drying cannot be interrupted at night or is preferably done at night due to the lower electricity costs.
  • the cooling tasks in vacuum drying also affect the operation of the vacuum pump:
  • a powerful pump first requires pre-cooling in the suction area so that the partial pressure of the condensable vapors can be reduced to a level necessary for the pumping process.
  • the process heat of the pump must be removed so that a favorable operating temperature can be maintained. For larger pumps, this is done using a closed cooling circuit with an external heat exchanger or by direct cooling with mostly expensive fresh water.
  • the suction pipe between the drying boiler and the pump is led through the cooling duct, the pump can be set up in such a way that the pump motor is swept by the pumped air flow, and the heat exchanger of the pump cooling circuit is arranged at a suitable point in the duct.
  • the chimney or the expanded part of the cooling channel is the most suitable location.
  • speed-controlled cooling fans are preferably used. Controlled cooling of two independent systems with only one blower control is possible because normally not both systems are in operation at the same time:
  • the vacuum pump is only switched on for a longer period of time before the drying process begins while the drying chamber is evacuated, if the wood has not yet is heated up and no condensation takes place yet.
  • the pump is only used for a relatively short time if the partial air pressure in the chamber has to be reduced to the setpoint due to leaks or air escaping from the wood.
  • the setpoint for the steam partial pressure is set via the condenser temperature and does not require use of the pump.
  • the boiler 2 provided with a gate 1 is provided with insulation 3 on its upper side.
  • the non-insulated lower part of the boiler has on its outside a cooling channel 4, the width of which is much larger than the height.
  • This cooling channel is formed on the one hand by the lower, non-insulated part of the wall of the boiler 2, on the other hand by an outer wall 5.
  • a carriage 6 with the loading surface 7 is inserted, on which a stack 8 of wood to be dried is loaded.
  • the loading area 7 forms part of the partition, which is continued on both sides of the carriage 6 with the loaded stack of wood 8 through inner walls 9.
  • the condensation space l0 is thus formed by the loading surface 7, the inner walls 8 and the non-insulated part of the wall of the boiler 2.
  • the remaining part of the interior of the boiler is the actual drying room, in which a fan l2 and a heating device l3 are accommodated.
  • the fan 12 produces a circular flow of the desiccant in the drying room.
  • water vapor constantly migrates from the drying space 11 into the condensation space 10 and is deposited here in the form of water on the boiler wall.
  • the kettle stands on feet l4, which rest on foundations (not shown).
  • the cooling air enters the cooling channel 4 close to the gate l.
  • the cooling duct extends beyond the side of the boiler remote from gate 1 and points here a part l5 with an enlarged cross-section.
  • the cooling duct is terminated here by a partition l6 in which openings l7 for fans l8 are arranged. These convey the heated cooling air into the chimney l9, in which the vacuum pump 20 and a heat exchanger 2l of the pump cooling circuit are accommodated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Drying Of Solid Materials (AREA)
EP93116395A 1992-10-14 1993-10-09 Dispositif de séchage du bois ou d'autres matériaux solides Expired - Lifetime EP0592973B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4234683A DE4234683A1 (de) 1992-10-14 1992-10-14 Vorrichtung zum Trocknen von Holz oder anderen Feststoffen
DE4234683 1992-10-14

Publications (2)

Publication Number Publication Date
EP0592973A1 true EP0592973A1 (fr) 1994-04-20
EP0592973B1 EP0592973B1 (fr) 1997-08-20

Family

ID=6470477

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93116395A Expired - Lifetime EP0592973B1 (fr) 1992-10-14 1993-10-09 Dispositif de séchage du bois ou d'autres matériaux solides

Country Status (5)

Country Link
US (1) US5425182A (fr)
EP (1) EP0592973B1 (fr)
AT (1) ATE157157T1 (fr)
DE (2) DE4234683A1 (fr)
ES (1) ES2108182T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109341252A (zh) * 2018-09-10 2019-02-15 重庆祥格家居有限公司 旋转式木板烘干机

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19522028C2 (de) * 1995-06-17 1999-12-16 Reinhard Brunner Verfahren und eine Vorrichtung zum Trocknen von Schnittholz bei Unterdruck
DE19543412A1 (de) * 1995-11-21 1997-05-22 Waldner Gmbh & Co Hermann Trockner, insbesondere für die chemische oder pharmazeutische Industrie
CA2374975A1 (fr) * 2000-05-19 2001-11-22 Sun Tae Choi Procede de sechage de bois et systeme associe
US6397488B1 (en) 2000-06-15 2002-06-04 Hewlett-Packard Company Apparatus and method for drying printing composition on a print medium
US7987614B2 (en) * 2004-04-12 2011-08-02 Erickson Robert W Restraining device for reducing warp in lumber during drying
US20080066340A1 (en) * 2004-08-31 2008-03-20 Kakuno Seisakusho Co., Ltd. Depressurization Type Drying Machine and Method for Drying Lumber Using the Same
CA2495959A1 (fr) * 2005-01-31 2006-07-31 Michael M. Sprague Systeme de ventilation et de recuperation de la chaleur pour sechoirs
US7963048B2 (en) * 2005-05-23 2011-06-21 Pollard Levi A Dual path kiln
AT503026B1 (de) * 2006-04-12 2007-07-15 Muehlboeck Kurt Verfahren zum trocknen von in stapeln zusammengefasstem holz
US8201501B2 (en) 2009-09-04 2012-06-19 Tinsley Douglas M Dual path kiln improvement
US20140007451A1 (en) * 2012-07-09 2014-01-09 Owen Jackson Brown, JR. Hay Storage System
AT515466B1 (de) 2014-02-26 2016-05-15 Mühlböck Kurt Verfahren zur Trocknung von Schüttgut
US10619921B2 (en) 2018-01-29 2020-04-14 Norev Dpk, Llc Dual path kiln and method of operating a dual path kiln to continuously dry lumber
CN114688852A (zh) * 2022-03-08 2022-07-01 阜南县中信柳木工艺品有限公司 用于成型木制品的智能烘干房

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4208913A1 (de) * 1991-03-23 1992-09-24 Brunner Reinhard Vorrichtung zum trocknen von schnittholz

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2273039A (en) * 1940-03-19 1942-02-17 Monie S Hudson Treating wood and wood products
US3283412A (en) * 1964-09-09 1966-11-08 Frederick R Furth Process and apparatus for drying and treating lumber
DK117688B (da) * 1965-03-18 1970-05-19 Atlas As Apparat til frysetørring af vandholdige produkter under vakuum.
US3574949A (en) * 1969-04-01 1971-04-13 Frederick R Furth Lumber drying

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4208913A1 (de) * 1991-03-23 1992-09-24 Brunner Reinhard Vorrichtung zum trocknen von schnittholz

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109341252A (zh) * 2018-09-10 2019-02-15 重庆祥格家居有限公司 旋转式木板烘干机

Also Published As

Publication number Publication date
DE4234683A1 (de) 1994-04-21
DE59307158D1 (de) 1997-09-25
EP0592973B1 (fr) 1997-08-20
US5425182A (en) 1995-06-20
ES2108182T3 (es) 1997-12-16
ATE157157T1 (de) 1997-09-15

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