EP1128145A2 - Procédé et dispositif pour le séchage de fibres de bois - Google Patents

Procédé et dispositif pour le séchage de fibres de bois Download PDF

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Publication number
EP1128145A2
EP1128145A2 EP01102539A EP01102539A EP1128145A2 EP 1128145 A2 EP1128145 A2 EP 1128145A2 EP 01102539 A EP01102539 A EP 01102539A EP 01102539 A EP01102539 A EP 01102539A EP 1128145 A2 EP1128145 A2 EP 1128145A2
Authority
EP
European Patent Office
Prior art keywords
hot gas
drying
drying zone
humidity
temperature
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.)
Withdrawn
Application number
EP01102539A
Other languages
German (de)
English (en)
Other versions
EP1128145A3 (fr
Inventor
Marco Becker
Udo Herzog
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.)
Elster GmbH
Original Assignee
LBE Feuerungstechnik GmbH
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 LBE Feuerungstechnik GmbH filed Critical LBE Feuerungstechnik GmbH
Publication of EP1128145A2 publication Critical patent/EP1128145A2/fr
Publication of EP1128145A3 publication Critical patent/EP1128145A3/fr
Withdrawn legal-status Critical Current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
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/30—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
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/20—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/25—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
    • 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 method and an apparatus for drying moist binders Wood fibers.
  • Wood fibers are used to manufacture high quality products, mainly for the production of laminate floors.
  • the wood will with the addition of water frayed, and the fibers are already treated with binding agent when wet. Then the binder is dried loaded fibers.
  • the wood fibers are dried in a hot gas stream, that of a heating device, as a rule a combustion device is generated.
  • a heating device that of a heating device
  • the process so far has the water content of the dried Fibers detected and depending on this the heating power the heating device or the combustion device set.
  • the measurement on the dried product is time consuming and often discontinuous. These measurements are a big timing element in terms of control technology and require cyclical checking by gravimetric Measurement methods.
  • the invention is based on the object, remedy here to create and reliable drying of the binder to allow loaded wood fibers, the required Moisture can be maintained very precisely in a simple manner can.
  • the invention is based on the knowledge that the Drying process depends on the climate in the drying zone, represented by the temperature and humidity of the hot gas at the outlet of the drying zone. It is under moisture Understanding water vapor partial pressure. It was recognized that under finite climatic conditions Represents a desorption equilibrium due to a constant moisture of the wood fibers. On this Those climatic conditions can be calculated calculate which must prevail if already after one predetermined period of time a predetermined fiber moisture should be achieved.
  • the temperature of the hot gas flow at the outlet changes the drying zone, only a corresponding one is required Change the inlet temperature to readjust to achieve the outlet temperature to the necessary value.
  • the humidity of the hot gas flow changes at the outlet of the Drying zone, this is an influence on the humidity Admission not possible.
  • the temperature of the hot gas flow be changed at the inlet so that the sets the required water vapor partial pressure again, i.e. the parameters gas humidity and gas temperature Define climate at which after the specified drying time the specified fiber moisture is achieved.
  • the invention thus offers the possibility of changes the operating parameter, namely the gas humidity before entry into the drying zone and the wood fiber throughput to compensate for simple temperature control, namely on the basis of a climate map based on the gas temperature and moisture is built up at the outlet of the drying zone.
  • the exact fiber moisture that can be achieved in this way minimizes rejects and ensures the production of end products with consistently high quality.
  • the hot gas humidity like the hot gas temperature, record easily and quickly, so that the scheme works extremely sensitive. This is especially true when if humidity and temperature are recorded continuously.
  • the drying zone is usually in cocurrent operate.
  • the fibers from the hot gas flow carried away and cyclically separated downstream of the drying zone.
  • drying is also countercurrent or possible in cross flow.
  • the regulation of the temperature of the Hot gas flow upstream of the drying zone can be done in the simplest Way done in that the heating power of the heating device is regulated.
  • An additional advantageous temperature control consists in introducing fresh air into the mixing zone. Also their fluctuations in moisture are compensated for.
  • Another advantageous target is aimed in the same direction Feature according to which downstream and preferably also upstream Drying zone the pressure in the hot gas is detected and then the recorded pressure value, possibly the difference between the recorded Pressure values, in the regulation of the generation of the hot gas flow is included. This takes into account the fact that the climate of the drying zone, if only in a relatively small amount Dimensions, depends on the hot gas pressure. Its detection enables an optimization of the regulation.
  • the temperature values are recorded and the humidity of the hot gas stream downstream of the Drying zone preferably continuously. This is also valid for all other parameters related to the generation of the hot gas flow regulate.
  • the invention is basically applicable to all organic bulk goods, especially those containing lignocellulose Substances such as wood shavings, flakes, beaches or annual plants, the relative to their further processing low moisture content must be dried, and with the proviso that the very precise adherence to the predetermined residual moisture for the quality of the in subsequent manufacturing process product produced by is essential.
  • Figure 1 is a schematic representation of a device according to the invention.
  • the device has a combustion device 1 which, as indicated by arrows, supplies air and gas becomes.
  • the exhaust gas of the combustion device 1 becomes fed to a mixing device 2 and from here as Hot gas flow passed through a drying device 3.
  • the drying device 3 is connected to a delivery device 4 for wood fibers loaded with binder.
  • the outlet the drying device 3 forms a cyclone device 5, used to separate the dried wood fibers serves.
  • the hot gas stream emerging from the drying device 3 partly gets into an exhaust gas cleaning device 6.
  • a partial flow is branched off beforehand and the mixing device 2 fed.
  • the latter is also with a line 7 connected to admixing fresh air.
  • the climate prevailing in the drying device 3 is detected at the inlet and at the outlet by hot gas pressure sensors 8 and 9, hot gas temperature sensors 10 and 11 and hot gas humidity sensors 12 and 13.
  • the sensors are connected to a control device 14.
  • the sensors work continuously and deliver the Control device 14 Information about climate changes result from changes in operating conditions. Dependent on of these, the control device 14 regulates the temperature of the hot gas flow at the entrance to the drying device. This can be done by changing the heating output of the Combustion device 1 happen, this to the control device 14 is connected.
  • Control bodies 15 and 16, which are also connected to the control device 14 are also a targeted addition of fresh air or a targeted recirculation of the loaded with vapors Partial stream of the hot gas, which is in front of the cleaning device 6 branches. The recirculated via this partial flow Heat also increases the thermal efficiency of the Process.
  • the cleaning device 6 is via the control device 14 also depending on the climate in the Drying device 3 regulated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP01102539A 2000-02-24 2001-02-06 Procédé et dispositif pour le séchage de fibres de bois Withdrawn EP1128145A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10008643 2000-02-24
DE10008643A DE10008643A1 (de) 2000-02-24 2000-02-24 Verfahren und Vorrichtung zum Trocknen von Holzfasern

Publications (2)

Publication Number Publication Date
EP1128145A2 true EP1128145A2 (fr) 2001-08-29
EP1128145A3 EP1128145A3 (fr) 2003-10-29

Family

ID=7632232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01102539A Withdrawn EP1128145A3 (fr) 2000-02-24 2001-02-06 Procédé et dispositif pour le séchage de fibres de bois

Country Status (2)

Country Link
EP (1) EP1128145A3 (fr)
DE (1) DE10008643A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1363097A1 (fr) 2002-05-13 2003-11-19 Robert Dr. Bankwitz Séchoir centrifuge pneumatique
CN118729701A (zh) * 2024-07-19 2024-10-01 广东顺昌印刷有限公司 微瓦楞的干燥控制方法和装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE368740B (fr) * 1966-08-22 1974-07-15 Svenska Flaektfabriken Ab
US3801264A (en) * 1972-04-24 1974-04-02 Heil Co Dehydrating system with exhaust gas recycling
DE2643497A1 (de) * 1976-09-23 1978-04-06 Thorn Domestic Appliances Ltd Lufttrockner
DE3529202C1 (de) * 1985-08-14 1986-09-11 Thomas 8302 Mainburg Reitmeier Hopfendarre
DE4023518A1 (de) * 1990-07-24 1992-03-05 Fritz Egger Gmbh Verfahren und anlage zum trocknen von feuchtem gut
US5603168A (en) * 1994-11-30 1997-02-18 The Coe Manufacturing Company Method and apparatus for controlling a dryer
AT404876B (de) * 1995-05-16 1999-03-25 Andritz Patentverwaltung Verfahren zum trocknen von feuchtem gut, insbesonders von holzfasern und anlage zur durchführung dieses verfahrens
DE19606472C1 (de) * 1996-02-21 1997-07-03 Fritz Egger Ges M B H & Co Verfahren und Vorrichtung zum schnellen Erreichen der Soll-Restfeuchte von Fasergut beim Start einer Durchlauftrocknung
AT3453U1 (de) * 1998-12-23 2000-03-27 Voest Alpine Ind Anlagen Verfahren und vorrichtung zum trocknen von feuchtem gut

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1363097A1 (fr) 2002-05-13 2003-11-19 Robert Dr. Bankwitz Séchoir centrifuge pneumatique
DE10221367B4 (de) * 2002-05-13 2006-05-11 Bankwitz, Robert, Dr. Pneumatischer Schleudertrockner
CN118729701A (zh) * 2024-07-19 2024-10-01 广东顺昌印刷有限公司 微瓦楞的干燥控制方法和装置

Also Published As

Publication number Publication date
EP1128145A3 (fr) 2003-10-29
DE10008643A1 (de) 2001-08-30

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