EP0163711B1 - Drying kiln for drying timber loads - Google Patents

Drying kiln for drying timber loads Download PDF

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Publication number
EP0163711B1
EP0163711B1 EP85900108A EP85900108A EP0163711B1 EP 0163711 B1 EP0163711 B1 EP 0163711B1 EP 85900108 A EP85900108 A EP 85900108A EP 85900108 A EP85900108 A EP 85900108A EP 0163711 B1 EP0163711 B1 EP 0163711B1
Authority
EP
European Patent Office
Prior art keywords
drying
control
chamber
timber
kiln
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
EP85900108A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0163711A1 (en
Inventor
Matti Uimonen
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.)
TEKMA Oy
Original Assignee
TEKMA 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 TEKMA Oy filed Critical TEKMA Oy
Priority to AT85900108T priority Critical patent/ATE33185T1/de
Publication of EP0163711A1 publication Critical patent/EP0163711A1/en
Application granted granted Critical
Publication of EP0163711B1 publication Critical patent/EP0163711B1/en
Expired 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
    • F26B15/16—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 the objects or batches of materials being carried by wheeled trucks
    • 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
    • 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
    • F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
    • 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 good
    • F26B2210/16—Wood, e.g. lumber, timber

Definitions

  • the present invention concerns a drying kiln for drying timber loads comprising a drying channel having a front and a back door on each end, respectively, and housing a roller track for conveying the timber loads through said channel, said drying channel being divided into at least two independently operated drying chambers arranged in series, each consecutive drying chamber being disposed so as to carry on the drying process substantially from that stage of the drying schedule which has been attained in the drying process in the foregoing chamber, the drying process in each independently operated drying chamber being controlled by control means governed by control signals deriving from a number of control units equal to the number of the independently operated drying chambers.
  • the object of the present invention is to avoid the drawbacks mentioned and to produce a new and a more advantageous control system in drive-through chamber type drying kilns.
  • each of the control units is arranged independently from the other control units to generate control signals according to a drying schedule designed for the corresponding timber load to be dried, the control units being connected to a selector means for selectively directing the control signals of each of the control units to the respective control means of the drying chambers, whereby directing the control signals of one of the control units to the control means of that drying chamber charged with the corresponding timber load.
  • control means of each independently operated drying chambers comprise control motors for respectively controlling a control damper for intake air and a control valve of a heating radiator for drying air.
  • the chamber-type drying kiln comprises three series-connected drive-through chamber-type drying kilns K 1 , K2 and K 3 .
  • the chamber group K 1 , K 2 and K 3 has a common front door 11, wherethrough the timber loads P to be dried are introduced (arrow P in ).
  • the dried timber loads are taken out through the back door 14 (arrow Pout).
  • the timber loads P 1 , P 2 and P 3 pass through the drying chambers K 1 , K 2 and K 3 on their carts 15, the wheels 16 of which move on tracks 10 passing through the group of chambers.
  • Between the drying chambers are placed movable partitions 12 and .13, which may be of rather low- weight construction.
  • FIG 1 are schematically shown the air circulation means by which the drying air is circulated in each chamber K through the timber package P to be dried, the temperature and/or humidity of this air being controlled by a control system according to the invention connected to the drying kiln.
  • the said means for circulating the drying air have been quite schematically depicted in Figure 1 and regarding a more detailed embodiment example reference is made to the EP-A-0 122 902.
  • On one side of and/or above each drying chamber K is disposed an air circulation duct 17, defined, as shown in Figure 1, by a partition 18 and an upper wall 19.
  • a blower 20 on the suction side of which intake air ducts 21 comprising control dampers 22 open into the channels 17 and through which fresh air (arrow F in ) is drawn to the drying air circulation.
  • intake air ducts 21 comprising control dampers 22 open into the channels 17 and through which fresh air (arrow F in ) is drawn to the drying air circulation.
  • exhaust air ducts not depicted.
  • drying air heating radiators 25 the volumetric flow and/or temperature of the heating fluid circulating in them being controlled with a control valve 24.
  • control dampers 22 in the intake air ducts 21 is controlled by control motors 23.
  • control valve 24 of the heating radiator 25 is controlled with control motors 26.
  • Each drying chamber K 1 , K 2 and K 3 is provided with control means of its own for the intake air and drying air heating radiator 25.
  • control system controlling the operation of the chamber-type drying kiln according to the invention depicted in Figure 1, said control system comprising three separate control centres S 1 , S 2 and S 3 .
  • the control centres S provide, in accordance with a programme entered in them in each instance in a manner known in itself in the art, a control signal a 1 , a 2 and a3.
  • Said control signals a 1 , a 2 and a3 are connected to a programme cycle selector switch means 30 which directs the control signals a 1 , a 2 and a3 each in turn to control the operation of the control motors 23, 26 of the different chambers K 1 , K 2 and K 3 of the drying kiln.
  • the control system may, if required, include measuring means and feedback means, by which for instance the state of the drying air circulating in the different drying chambers K 1 , K 2 , K 3 is monitored and the control signals a 1 , a 2 and a3 are accordingly influenced.
  • the control signals a 1 , a 2 , a3 may also be formed according to the "blind control" principle, in which case said measuring means and feedback arrangements are not needed.
  • the straight line K represents the dry temperature t k of the drying air and the straight line M, the equivalent wet temperature t m .
  • the horizontal axis T is the drying time and the vertical axis t, said drying air temperatures t k and t m in °C.
  • the switch 31 of the selector means 30 is turned, or automatically caused to turn, so that the control signal a 1 now goes along with the timber package P 1 , that is, the control signal a 1 coming from the first control centre S 1 begins to control the operation of the second chamber K 2 with the aid of its control motors 23 and 26. It is thus understood that the drying process is continued following the drying schedules K and M in the second chamber K 2 as if no transfer had taken place regarding drying schedule and directing of the control means.
  • the drying process is carried out, as shown in Figure 3, during the interval T 2 ⁇ T 1 to the dry temperature t 2k and the wet temperature t 2m , whereafter the package is moved to the next drying chamber K 3 and at the same time the selector switch 31 is stepped to its next position, in which the control signal a 1 of the control centre S 1 is directed to act on the control motors 23 and 26 of the third chamber K 3 .
  • drying of the same package is carried out during the interval T 3 ⁇ T 2 to the ultimate dry temperature t 3k and wet temperature t 3m under control by the same control centre S 1 under the control of which the drying process was commenced in the first chamber K 1 and carried out also in the second chamber K 2 .
  • drying kilns in actual practice there are as a rule several drying kiln chamber groups K 1 ⁇ K N connected in parallel. Each drying kiln chamber group K 1 -K N then has its own control system with as many (N) independently acting control units S 1 ⁇ S N as there are consecutive drying kiln chambers connected in series in the drying kiln chamber group controlled by it.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP85900108A 1983-11-15 1984-11-14 Drying kiln for drying timber loads Expired EP0163711B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85900108T ATE33185T1 (de) 1983-11-15 1984-11-14 Trockner zum trocknen von holzstaemmen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI834185 1983-11-15
FI834185A FI78348C (fi) 1983-11-15 1983-11-15 Foerfarande foer reglering av funktionen av genomkoerbar kammartork foer traevirke.

Publications (2)

Publication Number Publication Date
EP0163711A1 EP0163711A1 (en) 1985-12-11
EP0163711B1 true EP0163711B1 (en) 1988-03-23

Family

ID=8518075

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85900108A Expired EP0163711B1 (en) 1983-11-15 1984-11-14 Drying kiln for drying timber loads

Country Status (4)

Country Link
EP (1) EP0163711B1 (fi)
DE (1) DE3470095D1 (fi)
FI (1) FI78348C (fi)
WO (1) WO1985002250A1 (fi)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9482465B2 (en) 2013-03-15 2016-11-01 Usnr, Llc Unidirectional multi-path lumber kilns
US9964359B2 (en) 2013-03-15 2018-05-08 Usnr, Llc Multi-pass lumber kilns

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4872270A (en) * 1988-03-09 1989-10-10 Eastman Kodak Company Drying process
FR2660424A1 (fr) * 1990-04-03 1991-10-04 Electricite De France Procede et installation pour le sechage a grand debit de bois massif humide.
TW416261B (en) * 1997-04-24 2000-12-21 Ciba Sc Holding Ag Process and apparatus for the treatment of coated printed circuit boards
AU2001290387B2 (en) 2000-09-25 2006-09-28 Windsor Engineering Group Limited Timber drying kiln
US7364091B2 (en) 2003-12-19 2008-04-29 Scientific Games International, Inc. Embedded optical signatures in documents
AU2005302662B2 (en) 2004-10-28 2010-12-16 Scientific Games Holdings Limited Lottery game played on a geometric figure using indicia with variable point values
WO2006074423A2 (en) 2005-01-07 2006-07-13 Scientific Games International, Inc. Lottery game utilizing nostalgic game themes
US7662038B2 (en) 2005-01-07 2010-02-16 Scientific Games International, Inc. Multi-matrix lottery
KR20070103442A (ko) 2005-01-11 2007-10-23 사이언티픽 게임스 인터내셔널, 아이엔씨. 추가 로터리-선택 인디시아를 구매할 수 있는 온라인로터리 게임
US8262453B2 (en) 2005-02-09 2012-09-11 Scientific Games International, Inc. Combination lottery and raffle game
US7874902B2 (en) 2005-03-23 2011-01-25 Scientific Games International. Inc. Computer-implemented simulated card game
EP1874418A1 (en) 2005-04-27 2008-01-09 Scientific Games International, Inc. Game apparatus
US7654529B2 (en) 2005-05-17 2010-02-02 Scientific Games International, Inc. Combination scratch ticket and on-line game ticket
CN100455964C (zh) * 2006-12-26 2009-01-28 大连中土畜富威格木业有限公司 地板涂装干燥输送设备及工艺
US8397400B2 (en) * 2010-05-25 2013-03-19 Forest Research Institute Malaysia High temperature lumber treatment system
SE537903C2 (sv) * 2013-04-08 2015-11-17 Valutec Ab Förfarande för torkning av trävirke med varmluft och en kanaltork
DE102013006639A1 (de) * 2013-04-18 2014-10-23 Hildebrand Holztechnik Gmbh Kanal-Trocknungsvorrichtung
CN110617673A (zh) * 2019-10-09 2019-12-27 南平市华泰木竹有限公司 一种高效保量单板干燥工艺方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT335918B (de) * 1974-07-11 1977-04-12 Vanicek Viktor Trocknungsanlage, insbesondere trocknungskanal
EP0122902A2 (en) * 1983-04-19 1984-10-24 Tekma Oy Drive-through chamber type timber drying kiln

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE960259C (de) * 1951-01-26 1957-03-21 Konrad Wieser Selbsttaetige Steuerungseinrichtung an Trocknern fuer Stapelholz
FI34932A (fi) * 1962-11-20 1965-03-10 Gann App U Maschb G Sätt och anordning för att torka trä på konstgjort sätt
DE2524283A1 (de) * 1975-05-31 1976-12-09 Bollmann L Kg Verfahren und vorrichtung zur holzfeuchtemessung und holztrocknung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT335918B (de) * 1974-07-11 1977-04-12 Vanicek Viktor Trocknungsanlage, insbesondere trocknungskanal
EP0122902A2 (en) * 1983-04-19 1984-10-24 Tekma Oy Drive-through chamber type timber drying kiln

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9482465B2 (en) 2013-03-15 2016-11-01 Usnr, Llc Unidirectional multi-path lumber kilns
US9964359B2 (en) 2013-03-15 2018-05-08 Usnr, Llc Multi-pass lumber kilns

Also Published As

Publication number Publication date
EP0163711A1 (en) 1985-12-11
FI834185A (fi) 1985-05-16
WO1985002250A1 (en) 1985-05-23
FI78348C (fi) 1989-07-10
FI834185A0 (fi) 1983-11-15
FI78348B (fi) 1989-03-31
DE3470095D1 (en) 1988-04-28

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