EP0592973B1 - Vorrichtung zum Trocknen von Holz oder anderen Feststoffen - Google Patents

Vorrichtung zum Trocknen von Holz oder anderen Feststoffen Download PDF

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Publication number
EP0592973B1
EP0592973B1 EP93116395A EP93116395A EP0592973B1 EP 0592973 B1 EP0592973 B1 EP 0592973B1 EP 93116395 A EP93116395 A EP 93116395A EP 93116395 A EP93116395 A EP 93116395A EP 0592973 B1 EP0592973 B1 EP 0592973B1
Authority
EP
European Patent Office
Prior art keywords
cooling air
air duct
duct
tank
cooling
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 - Lifetime
Application number
EP93116395A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0592973A1 (de
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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Publication of EP0592973A1 publication Critical patent/EP0592973A1/de
Application granted granted Critical
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Classifications

    • 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 an axially parallel, extending in the longitudinal direction Cooling air duct, one wall of which is formed by part of the outside of the boiler, in which the air flow in the cooling air duct runs in the longitudinal direction of the boiler, and in which the effective duct width is greater than the height of the cooling air duct.
  • This device is known from DE-A-42 08 913.
  • This publication shows a cooling air duct which is delimited by the outer wall of the boiler and the foundation, extends in the axial direction of the boiler and contains fans in the channel below the boiler.
  • This embodiment has the disadvantage of high foundation costs, particularly in the case of long boilers.
  • the electrical energy supplied to the fan motor cannot be fully used, since a substantial part of the conveyed cooling air does not come into contact with the boiler wall and therefore does not contribute to cooling.
  • 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 is flat, that the cooling air duct extends in the longitudinal direction over most of the boiler, that the cooling air duct is widened in its course, preferably at one end, and at this widened point for the conveyance of Cooling air contains at least one fan, the diameter of which is greater than the height of the cooling air duct.
  • the channel height is between 2 and 15 cm.
  • 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 be at least so high that the amount of heat generated can be absorbed by the boiler wall before temperature compensation is reached.
  • duct heights should preferably be selected between 2 cm and 15 cm 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 Art 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. This ensures that high-performance fans of conventional design can be used to convey the cooling air through the very flat duct.
  • 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 conveyed 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 fan 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 10 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 12 and a heating device 13 are accommodated.
  • the fan 12 generates 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 14 which rest on foundations (not shown).
  • the cooling air enters the cooling channel 4 close to the gate 1.
  • the cooling duct extends beyond the side of the boiler remote from gate 1 and points here a part 15 with an enlarged cross section.
  • the cooling duct is terminated here by a partition 16 in which openings 17 for fans 18 are arranged. These convey the heated cooling air into the chimney 19, in which the vacuum pump 20 and a heat exchanger 21 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 Vorrichtung zum Trocknen von Holz oder anderen Feststoffen Expired - Lifetime EP0592973B1 (de)

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 EP0592973A1 (de) 1994-04-20
EP0592973B1 true EP0592973B1 (de) 1997-08-20

Family

ID=6470477

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93116395A Expired - Lifetime EP0592973B1 (de) 1992-10-14 1993-10-09 Vorrichtung zum Trocknen von Holz oder anderen Feststoffen

Country Status (5)

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

Families Citing this family (15)

* 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 (en) 2000-05-19 2001-11-22 Sun Tae Choi Method of drying wood and a system therefor
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
CA2578020A1 (en) * 2004-08-31 2006-03-09 Kakuno Seisakusho Co., Ltd. Depressurization type drying machine and method for drying lumber using the same
CA2495959A1 (en) * 2005-01-31 2006-07-31 Michael M. Sprague Heat recovery and ventilation system for dryers
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
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
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

Family Cites Families (5)

* 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
ATE129803T1 (de) * 1991-03-23 1995-11-15 Brunner Reinhard Vorrichtung zum trocknen von holz.

Also Published As

Publication number Publication date
DE4234683A1 (de) 1994-04-21
EP0592973A1 (de) 1994-04-20
ES2108182T3 (es) 1997-12-16
ATE157157T1 (de) 1997-09-15
DE59307158D1 (de) 1997-09-25
US5425182A (en) 1995-06-20

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