EP0360824B1 - Verfahren und anlage zur trocknung von holzprodukten - Google Patents

Verfahren und anlage zur trocknung von holzprodukten Download PDF

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Publication number
EP0360824B1
EP0360824B1 EP88904681A EP88904681A EP0360824B1 EP 0360824 B1 EP0360824 B1 EP 0360824B1 EP 88904681 A EP88904681 A EP 88904681A EP 88904681 A EP88904681 A EP 88904681A EP 0360824 B1 EP0360824 B1 EP 0360824B1
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EP
European Patent Office
Prior art keywords
air
engine
house
space
pipe
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
EP88904681A
Other languages
English (en)
French (fr)
Other versions
EP0360824A1 (de
Inventor
Björn Lindberg
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.)
Faxeborgens Virkestorkning I Soderhamn AB
Original Assignee
Faxeborgens Virkestorkning I Soderhamn AB
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 Faxeborgens Virkestorkning I Soderhamn AB filed Critical Faxeborgens Virkestorkning I Soderhamn AB
Priority to AT88904681T priority Critical patent/ATE73923T1/de
Publication of EP0360824A1 publication Critical patent/EP0360824A1/de
Application granted granted Critical
Publication of EP0360824B1 publication Critical patent/EP0360824B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • hot air and/or vapour from a suitable source of energy for example an oil or solid fuel furnace
  • a suitable source of energy for example an oil or solid fuel furnace
  • outlets provided with suction fans and positioned in the roof of the drying house.
  • both the outlets and the fans have a large capacity, implying that comparatively large amounts of heated air per unit of time pass through the room. This results in an exceedingly high drying cost per unit of timber volume.
  • the present invention aims at drastically reducing the cost for drying timber and to this end relates to a method which is characterised in that the wood products are stored in a space which is outwardly substantially sealed by a house or enclosure and in which at least one internal combustion engine, such as a diesel engine, is positioned, to which the required combustion air is supplied in the form of humid air directly from the storage space, and that the exhaust gases from said engine, while being evacuated to the open air outside said enclosure via an exhaust pipe, heat the supply or replacement air which enters said space from the outside via a supply pipe, an amount of replacement air being supplied to the interior of said enclosure via said supply pipe while an equal amount of engine exhaust gases is being evacuated via said exhaust pipe.
  • a method which is characterised in that the wood products are stored in a space which is outwardly substantially sealed by a house or enclosure and in which at least one internal combustion engine, such as a diesel engine, is positioned, to which the required combustion air is supplied in the form of humid air directly from the storage space, and that the exhaust gases from said engine
  • the invention also relates to a plant for drying wood products.
  • the characteristic features of this plant are stated in the appended claims.
  • CH-A-383,267 discloses a hot blast furnace or drier comprising an oil burner arranged in a combustion chamber from which exhaust gases are discharged to a chimney via pipes and via openings in a circular chamber or channel arranged between inner and outer circular chambers through which the air intended to be heated passes.
  • the air to be heated is supplied to these circular chambers at the drier end where the oil burner is positioned, and is caused to pass through the chambers to the opposite end, while being heated by the exhaust gases both in the actual combustion chamber and the intermediate circular chamber.
  • the outer circular chamber is further connected to and communicates with a slit defined between the chimney and a surrounding pipe jacket. The required supply air is supplied to the combustion chamber through a special damper.
  • the drier according to the CH-A-383,267 were located in an outwardly closed space in the same manner as the internal combustion engine according to the present invention, the same well-known effect as in a non-ventilated room in which one tries to dry e.g. clothes would arise; as long as the humid air is not evacuated, the clothes will remain moist, no matter how much the heat in the room is increased.
  • the method according to the present invention is characterised in that, during evacuation of the engine exhaust gases via the exhaust pipe, an equally large amount of air is supplied to the interior of the enclosure via the supply pipe, i.e. all humid outlet air passes the engine in the form of combustion air, and the enclosure in which the internal combustion engine is located, is out- . wardly closed. In other words, all ventilation takes place via the engine, and the moderate amounts of heat which the engine develops are enough to maintain a sufficient temperature within the enclosure.
  • a crucial fact is that the engine consumes large amounts of air, which in turn means that the air in the enclosure is effectively dehumidified.
  • An additional advantage which in actual practice is most important and which is obtained by using an internal combustion engine, e.g. of the diesel engine type, is that the engine at the same time can drive the necessary fans, which is quite impossible with the oil burner according to CH-A-383,267.
  • the enclosed drawing illustrates a schematic perspective view of a plant according to the invention.
  • the plant comprises in per se known manner a house designated 1 in its entirety and having one or more gates 2 through which a suitable amount of stacks 3 of wood products arranged like battens can be moved into and taken out from the interior of the house.
  • the gates 2 are closed, the walls 4 and the roof 5 of the house form an outwardly substantially sealed enclosure, to the interior of which air can pass only via a single inlet as described below.
  • the engine comprises an air inlet 7 which opens directly in the drying space proper.
  • the engine is of the type comprising a turbo-compressor which in known manner supplies exceedingly large amounts of combustion air per unit of time to the combustion chamber of the engine.
  • the engine 6 is considerably spaced apart from the exhaust outlet, which implies a considerable length of the exhaust pipe 8.
  • the exhaust pipe will be particularly long if designed with three parallel loops, as in the drawing. In practice, the pipe can thus have a length of 10-50, preferably 20-30 m.
  • the supply or replacement air is supplied to the drying space via a supply pipe 10 which is significantly larger than the exhaust pipe 8 and which is, at least partially, concentrically mounted on the outside of the exhaust pipe or parts thereof.
  • the supply pipe 10 extends from an inlet opening 11 conveniently flush with the wall through which the exhaust pipe 8 extends to the open air, to an outlet opening 12 which preferably, but not necessarily, is located high up in the drying space.
  • a plurality of fans 13 which via a transmission, such as a belt transmission 14, are connected to a power take-off in the form of an output shaft 15 of the engine 6.
  • the engine 6 is started. Quite soon after the engine has started, the pipe 8 is heated to a high temperature by the hot flue gases or exhaust gases passing through the same from the engine 6 to the outlet opening 9 in the open air. At the same time as the engine exhaust gases are evacuated via the exhaust pipe 8, an equally large amount of air is supplied to the interior of the house via the supply pipe 10, viz. in the form of cold fresh air from the outside.
  • the sucked-in supply air is heated so as to have, while passing through the outlet opening 12 into the drying space, a temperature which is considerably higher than room temperature, in practice about 40-50°C.
  • the fans 13 cause the sucked-in air thus heated by the exhaust pipe to circulate in the interior of the house.
  • the circulation is initiated in the area immediately below the roof of the house.
  • the hot air passes between the individual wood products of the stacks 3 and absorbs moisture released by the wood products, simultaneously as the air is being cooled and sinks towards the lower portion of the drying space.
  • the humidified, slightly cooled air is received through the air intake 7 and is used in conventional manner as combustion air to operate the engine 6. In other words, the internal combustion engine 6 will "eat" the humid air which is to be evacuated from the drying space.
  • the method according to the invention may advantageously be used not only for drying sawn wood products, such as boards, planks and the like, but also for drying non-sawn wood products, such as posts, pole, etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Radar Systems Or Details Thereof (AREA)

Claims (5)

1. Verfahren zum Trocknen von Holzprodukten, dadurch gekennzeichnet, dass die Produkte (3) in einem Raum gelagert werden, welcher von einem Haus oder einer Umhüllung (1) nach aussen im wesentlichen abgeschlossen ist und in welchem zumindest ein Verbrennungsmotor (6), z.B. ein Dieselmotor, untergebracht ist, dem die erforderliche Verbrennungsluft in Form von feuchter Luft direkt vom Lagerraum zugeführt wird, und dass die Abgase vom Motor während der über eine Auspuffleitung (8) erfolgenden Absaugung ins Freie ausserhalb des Hauses die über eine Zuleitung (10) in den genannten Raum von aussen eintretende Zuluft oder Ersatzluft erhitzen, wobei eine Menge Ersatzluft über die Zuleitung (10) dem Inneren des Hauses zugeführt wird, während eine gleich grosse Menge Motorabgase über die Auspuffleitung (8) abgesogen wird.
2. Anlage zum Trocknen von Holzprodukten, dadurch gekennzeichnet, dass ein Holzproduktlagerraum, der von einem Haus oder einer Umhüllung (1) im wesentlichen abgeschlossen oder abschliessbar ist, zumindest einen Verbrennungsmotor (6), z.B. einen Dieselmotor, enthält, der die erforderliche Verbrennungsluft in Form von feuchter Luft direkt vom Lagerraum empfängt, und dass eine Leitung (8) zum Absaugen der Motorabgase ins Freie ausserhalb des Hauses in einem Wärmetauscher (8, 10) enthalten ist, welcher die über eine Zuleitung (10) in den genannten Raum von aussen eintretende Zuluft oder Ersatzluft erhitzt, wobei die Zuleitung während der Absaugung der Motorabgase über die Auspuffleitung (8) eine gleich grosse Menge Ersatzluft von aussen dem Inneren des Hauses zuführt.
3. Anlage nach Anspruch 2, dadurch gekennzeichnet, dass die Leitung (10) zumindest teilweise einen verhältnismässig grossen Durchmesser hat und vorzugsweise konzentrisch auf der Leitung (8) mit kleinerem Durchmesser angebracht ist, die, während die Abgase vom Motor einem Auslass (9) ausserhalb des Hauses (1) zugeführt werden, die durch den spaltförmigen, rundumverlaufenden Raum zwischen den Leitungen (8, 10) eingesogene Luft anheizt.
4. Anlage nach Anspruch 3, dadurch gekennzeichnet, dass der im Trockenraum untergebrachte Auslass (12) der Zuleitung (10) hoch oben in diesem Raum angebracht ist, vorzugsweise dicht unter dem Dach (5) des Hauses (1).
5. Anlage nach einem der Ansprüche 2-4, dadurch gekennzeichnet, dass ein Abtrieb (15) des Verbrennungsmotors (6) an eine Transmission (14) angeschlossen ist, die ein oder mehrere Gebläse (13) zum Umwälzen der Zuluft im genannten Raum treibt.
EP88904681A 1987-05-29 1988-04-12 Verfahren und anlage zur trocknung von holzprodukten Expired EP0360824B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88904681T ATE73923T1 (de) 1987-05-29 1988-04-12 Verfahren und anlage zur trocknung von holzprodukten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8702259A SE457564B (sv) 1987-05-29 1987-05-29 Foerfarande och anlaeggning foer torkning av virkeselement
SE8702259 1987-05-29

Publications (2)

Publication Number Publication Date
EP0360824A1 EP0360824A1 (de) 1990-04-04
EP0360824B1 true EP0360824B1 (de) 1992-03-18

Family

ID=20368704

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88904681A Expired EP0360824B1 (de) 1987-05-29 1988-04-12 Verfahren und anlage zur trocknung von holzprodukten

Country Status (7)

Country Link
EP (1) EP0360824B1 (de)
AT (1) ATE73923T1 (de)
AU (1) AU1787588A (de)
DE (1) DE3869411D1 (de)
FI (1) FI895691A0 (de)
SE (1) SE457564B (de)
WO (1) WO1988009471A1 (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH383267A (de) * 1959-07-21 1964-10-15 Graepel Friedrich Warmluftofen
US4132007A (en) * 1977-08-17 1979-01-02 Voorheis James T Single burner heater and incinerator

Also Published As

Publication number Publication date
DE3869411D1 (de) 1992-04-23
WO1988009471A1 (en) 1988-12-01
SE457564B (sv) 1989-01-09
FI895691A7 (fi) 1989-11-28
EP0360824A1 (de) 1990-04-04
ATE73923T1 (de) 1992-04-15
SE8702259D0 (sv) 1987-05-29
AU1787588A (en) 1988-12-21
FI895691A0 (fi) 1989-11-28

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