EP2160559B1 - Method for dynamic control of the drying period in a drying tunnel - Google Patents

Method for dynamic control of the drying period in a drying tunnel Download PDF

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Publication number
EP2160559B1
EP2160559B1 EP08741920.6A EP08741920A EP2160559B1 EP 2160559 B1 EP2160559 B1 EP 2160559B1 EP 08741920 A EP08741920 A EP 08741920A EP 2160559 B1 EP2160559 B1 EP 2160559B1
Authority
EP
European Patent Office
Prior art keywords
wood
drying
batch
pathway
moisture ratio
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.)
Active
Application number
EP08741920.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2160559A4 (en
EP2160559A1 (en
Inventor
designation of the inventor has not yet been filed The
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.)
Valutec AB
Original Assignee
Valutec AB
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Publication of EP2160559A1 publication Critical patent/EP2160559A1/en
Publication of EP2160559A4 publication Critical patent/EP2160559A4/en
Application granted granted Critical
Publication of EP2160559B1 publication Critical patent/EP2160559B1/en
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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
    • 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
    • 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
    • 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
    • F26B15/18—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 endless belts
    • 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
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • 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 method for the dynamic control of the drying period in a drying tunnel according to the introduction of claim 1.
  • Wood that has been stacked to form packages with cross-pieces between is fed into drying tunnels at a pre-determined speed along a drying pathway, while it is at the same time swept over by a circulating stream of drying agent, which normally consists of air.
  • the drying air is circulated in counter-current flow to the direction of feed of the wood.
  • Drying arrangements of this type normally have an extended tunnel-formed chamber for the admission of the wood that is to be dried.
  • the tunnel has at one end an entry port for the wood, this end will be referred to here as the "wet end” due to the wet condition of the wood at this end, and an exit port at the opposite end of the tunnel, this end will be referred to as the "dry end”.
  • the chamber has also a pathway for return of the circulating drying air.
  • a moist atmosphere which has a wet temperature and a dry temperature, is maintained within the drying chamber.
  • a fixed number of trolleys are present in the drying pathway and these trolleys are returned after completed drying and exit to a store in front of the entry port, ready to be reused.
  • a new trolley with its load of moist wood is fed at regular intervals into the pathway while at the same time a trolley with dried wood is extracted from the drying tunnel and has its wood unloaded.
  • regular intervals is here used to denote what is known within the industry as “throughput times", i.e. the interval of time at which a new load of wood is fed into the drying pathway through the entry port and out from the drying pathway through the exit port, through the complete train of trolleys being displaced forwards along the drying pathway.
  • the drying time is determined by establishing suitable throughput times based on the number of batches in the kiln and the estimated total drying time. It can be mentioned as an example that if the throughput time is set to be four hours, a new trolley with wood is fed into and out from the pathway every four hours.
  • Drying tunnels are controlled and regulated with the aid of parameters, which comprise temperature, air humidity and throughput time, determined in advance.
  • parameters comprise temperature, air humidity and throughput time, determined in advance.
  • One example of a drying tunnel is disclosed in document US 5 197 201 A1 -
  • the said parameters are adapted to the wood that is to be dried in the pathway with the aid of values based on experience or values that have been pre-determined through simulation.
  • the moisture ratio is the parameter that specifies the water content of the wood as a percentage of the dry weight. It can be pointed out in this context that the desired moisture ratio of wood differs significantly depending on the intended area of use. It can be mentioned, for example, that wood intended for furniture is normally dried to give a moisture ratio of around 6-10%, while construction timber normally has a moisture ratio of around 20%.
  • One aim of the present invention thus is to achieve a method that allows the drying of batches of wood of differing types to pre-determined moisture ratios, and that in addition makes it possible to change the drying time depending on the measured final moisture ratio relative to the desired target moisture ratio.
  • the drawing shows a drying tunnel with an extended drying chamber 1 whereby the chamber shown in the example is of the type known as "single-zone", in order to make understanding of the invention easier. It should be realised, naturally, that the invention can be applied also to other existing drying tunnels with several connected drying zones that follow one after the other.
  • the drying chamber 1 is provided at its ends with an entry port 2 for the introduction of moist, undried wood (at the wet end), and an exit port 3 for the output of dried wood from the chamber (at the dry end). It is possible that the wet end and the dry end may be designed as sluices with separate compartments for the introduction and the withdrawal of the wood that is to be dried.
  • Wood in the form of batches or packages, denoted by 4:1 to 4:n, are transported along the drying pathway whereby the batch of wood denoted by 4:1 is located immediately in front of the entry port 2 and the batch of wood denoted by 4:n is located inside the drying chamber immediately in front of the exit port 3.
  • the batches of wood are transported in unison forwards along a pre-determined distance along the drying pathway 1 in the direction that is denoted by the arrow A.
  • This throughput time and the drying process in itself are normally controlled by a system based on a PLC control system.
  • the wood during drying can be fed along the drying pathway 1 in either its longitudinal or its transverse direction.
  • the wood is transported along the drying pathway 1 on a number of trolleys 5 that run on rails.
  • Alternative transport means can be constituted by endless transport elements such as belts or chains, running along the drying pathway 1.
  • the wood is arranged in the form of batches 4:1-4:n located with such intermediate spaces that the drying air reaches all parts of the wood efficiently.
  • a fixed number of trolleys for example around 20 trolleys with wood, are present along the drying pathway, and these trolleys are returned after the drying is complete and after output through the exit port 3, to a store located in front of the entry port 2, ready to be used again.
  • a new trolley with its load of moist wood is fed at regular intervals into the pathway, while a trolley with a dried wood batch is at the same time fed out from the kiln and unloaded.
  • the term "at regular intervals" denotes the said "throughput time".
  • a pathway 6 for the return of circulatory air in the direction of the arrows B and C, against the direction of transport or withdrawal of the material in the chamber 1, is located above the drying chamber 1 and is placed in connection with this chamber through openings 7, 8 at the input end and output end of the chamber.
  • the pathway 6 contains in known manner a fan 9 with a rate of revolution that can be varied, for the circulation of drying air in the chamber, and a heating battery 10 for heating the air.
  • Separate inlet and outlet pathways 12, 13 are arranged at the pathway in front of the heating battery 10, and these pathways can be placed in connection with the surrounding atmosphere through motor-driven baffles 14, 15 that can be individually controlled.
  • the climate in the drying chamber is controlled through regulation of the dry temperature and the wet temperature whereby the dry temperature is principally controlled with the aid of the heating battery 10 and a shunt 11, while the wet temperature is controlled with the aid of the baffle 15 and possibly also steam pre-treatment equipment.
  • the measurement of the wet and dry temperatures normally takes place at the output end and is controlled from this end, but this may take place also at other locations, such as, for example, the input end.
  • a measurement and registration zone 22 is established with an arrangement 23 for measuring the moisture ratio of the current batch 4:n of wood, which is located immediately in front of the exit port.
  • moisture ratio denotes the percentage by weight of water in the wood relative to the dry substance.
  • the measurement arrangement 23 can be constituted by any suitable known type of moisture ratio gauge such as, for example, of resistance measurement type or of another type that allows automatic measurement, preferably at a distance from the batch of wood. In order to be able to determine the moisture ratio in the wood of a complete batch with the precision required, it is appropriate that measurements are carried out for a number of planks in the batch, on, for example, one or several packages of wood.
  • the final moisture ratio value ⁇ n that has been measured for the wood in the batch of wood 4:n that is located at the innermost extent of the drying pathway 1 at the final drying stage immediately in front of the exit port 3 is compared with the target moisture ratio value ⁇ n for the wood, which has been determined in advance or is desired for the wood in the current package 4:n. If, for example, the final batch of wood 4:n has a moisture ratio ⁇ n that is less than or equal to the desired target moisture ratio ⁇ n, withdrawal is carried out.
  • the throughput time of the drying tunnel can in this way be regulated such that it is always optimal, independently of the different requirements of the batches of wood that pass through the drying pathway with respect to desired final moisture ratio of the dried wood.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP08741920.6A 2007-04-26 2008-04-16 Method for dynamic control of the drying period in a drying tunnel Active EP2160559B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0701024A SE0701024L (sv) 2007-04-26 2007-04-26 Förfarande för dynamisk styrning av torktiden i en kanaltork
PCT/SE2008/050430 WO2008133583A1 (en) 2007-04-26 2008-04-16 Method for dynamic control of the drying period in a drying tunnel

Publications (3)

Publication Number Publication Date
EP2160559A1 EP2160559A1 (en) 2010-03-10
EP2160559A4 EP2160559A4 (en) 2016-01-13
EP2160559B1 true EP2160559B1 (en) 2017-06-28

Family

ID=39925922

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08741920.6A Active EP2160559B1 (en) 2007-04-26 2008-04-16 Method for dynamic control of the drying period in a drying tunnel

Country Status (3)

Country Link
EP (1) EP2160559B1 (sv)
SE (1) SE0701024L (sv)
WO (1) WO2008133583A1 (sv)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102012157A (zh) * 2010-12-02 2011-04-13 蓬莱京鲁渔业有限公司 一种节能型干燥系统
CN102538421B (zh) * 2012-02-29 2014-05-14 兰州奇正粉体装备技术有限公司 一种加热脱水干燥枸杞的方法
CN102997631A (zh) * 2012-10-31 2013-03-27 宜兴市宜刚环保工程材料有限公司 一种蜂窝式脱硝催化剂连续干燥窑炉
CN104634080A (zh) * 2015-02-10 2015-05-20 重庆三爱海陵实业有限责任公司 气门烘干设备
SE1751496A1 (sv) * 2017-12-05 2019-06-06 Valutec Ab Genomkörbar virkestork och transportör avsedd för en sådan virkestork
PL3667218T3 (pl) * 2018-12-12 2022-01-03 Valutec Ab Sposób suszenia drewna

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3422545A (en) * 1966-07-08 1969-01-21 Nukor Proprietary Ltd Timber drying process and apparatus
US4663860A (en) 1984-02-21 1987-05-12 Weyerhaeuser Company Vertical progressive lumber dryer
US5197201A (en) * 1988-09-27 1993-03-30 Ekono Oy Process for drying timber
AU9038701A (en) 2000-09-25 2002-04-02 Windsor Engineering Group Ltd Timber drying kiln
SE0401545L (sv) * 2004-06-16 2005-12-17 Wsab Oy Ab Vandringstork

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2160559A4 (en) 2016-01-13
EP2160559A1 (en) 2010-03-10
WO2008133583A1 (en) 2008-11-06
SE0701024L (sv) 2008-10-27

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