EP0714006A1 - Procédé de séchage d'une substance, en particulier de copeaux de bois - Google Patents

Procédé de séchage d'une substance, en particulier de copeaux de bois Download PDF

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Publication number
EP0714006A1
EP0714006A1 EP95810726A EP95810726A EP0714006A1 EP 0714006 A1 EP0714006 A1 EP 0714006A1 EP 95810726 A EP95810726 A EP 95810726A EP 95810726 A EP95810726 A EP 95810726A EP 0714006 A1 EP0714006 A1 EP 0714006A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
steam
gas mixture
heated
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.)
Granted
Application number
EP95810726A
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German (de)
English (en)
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EP0714006B1 (fr
Inventor
Werner Kunz
Cyrill Hammer
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.)
W Kunz Drytec AG
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W KUNZ AG
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Publication date
Application filed by W KUNZ AG filed Critical W KUNZ AG
Publication of EP0714006A1 publication Critical patent/EP0714006A1/fr
Application granted granted Critical
Publication of EP0714006B1 publication Critical patent/EP0714006B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F26B23/022—Heating arrangements using combustion heating incinerating volatiles in the dryer exhaust gases, the produced hot gases being wholly, partly or not recycled into the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/24—Wood particles, e.g. shavings, cuttings, saw dust

Definitions

  • the present invention relates to a method for drying a substance, in particular wood chips, as described in the preamble of claim 1.
  • the exhaust air emerging from the drum dryer contains, in addition to water vapor, gaseous wood constituents and aerosols, which cannot be released into the atmosphere without being cleaned, since the pollutant contents are too high.
  • the flue gas must therefore be cleaned, which can be done by filtration, washing and / or regenerative thermal oxidation.
  • An optimal cleaning of the flue gas would be obtained by combining these options. Since these facilities have to be purchased in addition to the entire drying system, this is an expensive solution, and the operation and maintenance of these additional systems is also complex.
  • the exhaust gas emerging from the combustion chamber can therefore, as a rule, be released directly into the atmosphere after passing through the first heat exchanger and heating the steam-gas mixture, with no optical cloudiness and no odor nuisance when emerging from the chimney.
  • the temperature In order to achieve the above-mentioned oxidations in the combustion chamber, the temperature must be kept at around 900 ° C.
  • the fuel gas having this temperature is fed to a first heat exchanger in which the steam-gas mixture fed into the drum dryer is heated to a temperature of approximately 500.degree. It has now been shown that on the entry side of the fuel gas into the first heat exchanger, the first flow around the heat exchanger elements is subject to strong heating, since the steam-gas mixture on the inside also already has a temperature of approximately 500 ° C.
  • the material of these first heat exchanger elements is exposed to such severe stresses that their service life is limited.
  • the object of the invention is to modify the known methods so that the thermal load on the heat exchanger elements is reduced and, consequently, their service life is increased.
  • this further heat exchanger in which the fuel gas is supplied at a high temperature, is flowed through by the decoupled part of the steam-gas mixture at a relatively low temperature, the material of the heat exchanger elements of this heat exchanger is consequently relatively strongly cooled from the inside, so that the thermal load on the material can be kept correspondingly low.
  • Fig. 1 shows a schematic representation of the sequence of the inventive method in a possible embodiment.
  • FIG. 2 shows a schematic representation of the sequence of the method according to the invention according to FIG. 1, with predrying being provided.
  • a burner 1 is supplied in a known manner with a fuel which is burned in the combustion chamber 2.
  • the supply air to this burner 1 or the combustion chamber 2 is supplied through the supply line 3.
  • the heated fuel gas is, before it is through a first heat exchanger 4 is passed, pass through a further heat exchanger 21.
  • the exhaust air passes through a second heat exchanger 5, in which the supply air fed to the burner 1 is heated, and via a line 6 into a chimney 7, through which the exhaust air is released into the atmosphere.
  • a steam-gas mixture is heated by the fuel gas.
  • the heated steam-gas mixture is fed to a drum dryer 8, in which the substance to be dried is introduced in a known manner via the feed 9.
  • a drum dryer 8 By drying wood shavings, for example, further steam and wood contents are released into the vapor-gas mixture in gaseous form and in the form of aerosols, such as volatile hydrocarbons.
  • the dried wood chips and the steam-gas mixture are fed via a closed channel 10 to a cyclone separator 11, in which the dried wood chips and the steam-gas mixture are separated. The further processing of the dried wood chips takes place in a known manner.
  • the steam-gas mixture is fed back into the first heat exchanger 4 with the aid of a fan 12. This creates a closed cycle for the steam-gas mixture.
  • a partial stream of the steam-gas mixture can be coupled out via a line 22.
  • This decoupled partial flow of the steam-gas mixture is passed through the further heat exchanger 21, after which it is introduced into the combustion chamber 2.
  • a flap 23 is provided in a known manner for flow rate control.
  • the fuel gas must reach a temperature of around 900 ° C so that all combustible gases can be combusted in the combustion chamber.
  • This fuel gas is cooled in the further heat exchanger 21 to a temperature of approximately 750 ° C., whereupon it reaches the first heat exchanger 4.
  • the steam-gas mixture is heated in this first heat exchanger 4 from approximately 130 ° C. to approximately 500 ° C.
  • the outcoupled partial flow of the steam-gas mixture brings about a reduction in the temperature of the fuel gas from 900 ° C. to 750 ° C.
  • this outcoupled part of the steam-gas mixture is approximately 130 ° C warmed to approximately 370 ° C. Due to the relatively low temperature of the outcoupled partial stream of the steam-gas mixture, the heat exchanger elements in the further heat exchanger 21 are not heated as much as a whole, even if the fuel gas flows around them at a temperature of 900 ° C., so that in this further heat exchanger 21 the thermal load on the material of the heat exchanger elements remains low and, as a result, a long service life is achieved.
  • the drying process according to the invention can thus keep the thermal load on the materials from which the heat exchanger elements in the heat exchangers 4 and 21 consist so that the service life of these elements is increased.
  • FIG. 2 shows in principle the same procedure for drying wood chips as in FIG. 1, the difference being that the exhaust air from the second heat exchanger 5 flows through a predrying device 14 and from there by means of a further fan 15 to the chimney 7 is supplied for release to the atmosphere.
  • the wood chips to be dried are passed through this predrying device 14 before they are fed to the drum dryer 8 through the feed 9.
  • these wood chips are preheated to a temperature of approximately 75 ° C.
  • the systems shown schematically in the two figures can be equipped in a known manner by the necessary control devices.
  • the method according to the invention can also be used to dry other substances, such as grass, sugar beet chips or sludges of any kind.

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)
EP95810726A 1994-11-24 1995-11-21 Procédé de séchage d'une substance, en particulier de copeaux de bois Expired - Lifetime EP0714006B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH354994 1994-11-24
CH3549/94 1994-11-24

Publications (2)

Publication Number Publication Date
EP0714006A1 true EP0714006A1 (fr) 1996-05-29
EP0714006B1 EP0714006B1 (fr) 1997-12-29

Family

ID=4258390

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95810726A Expired - Lifetime EP0714006B1 (fr) 1994-11-24 1995-11-21 Procédé de séchage d'une substance, en particulier de copeaux de bois

Country Status (5)

Country Link
US (1) US5697167A (fr)
EP (1) EP0714006B1 (fr)
AT (1) ATE161622T1 (fr)
CA (1) CA2163305A1 (fr)
DE (1) DE59501167D1 (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0851194A3 (fr) * 1996-12-23 1998-08-26 Starcosa - Tag Sécheur avec purification de gaz d'échappement par post-combustion thermique
WO2002040932A1 (fr) * 2000-11-14 2002-05-23 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procede pour traiter des substances fibreuses
EP1314943A1 (fr) * 2001-11-23 2003-05-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procédé pour traiter des substances fibreuses
EP1363097A1 (fr) 2002-05-13 2003-11-19 Robert Dr. Bankwitz Séchoir centrifuge pneumatique
EP1843114A1 (fr) * 2006-04-06 2007-10-10 Swedish Exergy Consulting AB Installation de séchage
EP2078911A1 (fr) 2008-01-10 2009-07-15 Kronospan CR, spol. s.r.o. Procédé destiné au séchage en continu de matériaux en vrac, en particulier de fibres de bois et/ou de copeaux de bois
WO2010102736A1 (fr) * 2009-03-10 2010-09-16 Kronotec Ag Installation destinée à sécher des copeaux de bois et procédé associé pour sécher des copeaux de bois
DE102010012005A1 (de) * 2010-03-15 2011-09-15 Dürr Systems GmbH Thermische Abluftreinigungsanlage
EP2889537A1 (fr) * 2013-12-04 2015-07-01 Rupert Kaindl Installation de séchage et installation de combustion
EP2411749A4 (fr) * 2009-03-25 2016-01-20 Saxlund Internat Holding Ab Système et procédé de séchage
WO2018157947A1 (fr) 2017-03-03 2018-09-07 Douglas Technical Limited Appareil et procédé de séchage continu de produits en vrac, en particulier de copeaux de bois et/ou de fibres de bois, comprenant un échangeur de chaleur
WO2018157949A1 (fr) 2017-03-03 2018-09-07 Douglas Technical Limited Appareil et procédé de séchage continu de produits en vrac, en particulier de copeaux de bois et/ou de fibres de bois comprenant un brûleur multicombustible doté d'un système de refroidissement de moufle
US11384981B2 (en) 2017-06-06 2022-07-12 Kronoplus Limited Apparatus and method for continuously drying bulk goods
US11499778B2 (en) 2017-03-03 2022-11-15 Douglas Technical Limited Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a solid fired hot gas generator
US11543124B2 (en) 2017-03-03 2023-01-03 Kronoplus Limited Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a hot gas cyclone

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19710711A1 (de) * 1995-09-22 1998-09-17 Dieffenbacher Gmbh Maschf Verfahren, Filterpresse sowie Steuer- und Regeleinrichtung zur Reduzierung des Wassergehaltes von Feststoffmaterialien und/oder Schlämmen
SE9601721L (sv) * 1996-05-06 1997-11-07 Flaekt Ab Trätorkningsanläggning samt förfarande för att rena en torkgas från en trätorkningsanordning
US6163981A (en) * 1998-11-25 2000-12-26 Nilsson; Bengt Method and apparatus for drying wood particles
US6393727B1 (en) * 1999-10-01 2002-05-28 Louisiana-Pacific Corporation Method for reducing VOC emissions during the manufacture of wood products
DE10011177A1 (de) * 2000-03-08 2001-09-20 Valmet Panelboard Gmbh Verfahren und Vorrichtung zum direkten Trocknen von Teilchen
TW562700B (en) * 2000-11-28 2003-11-21 Takamo Ind Co Ltd Garbage processing machine
EP1466131B1 (fr) * 2001-12-17 2006-12-27 HOLM CHRISTENSEN BIOSYSTEMER ApS Dispositif de sechage de produit particulaire a l'aide de vapeur surchauffee
GB0214412D0 (en) 2002-06-21 2002-07-31 Svonja George Method and apparatus for drying
DE10349090A1 (de) * 2003-10-22 2005-06-16 Eisenmann Maschinenbau Gmbh & Co. Kg Anlage und Verfahren zum Trocknen von Gegenständen
US20060101663A1 (en) * 2004-11-08 2006-05-18 Perin Nolan A Lumber drying
US7456326B2 (en) * 2007-03-01 2008-11-25 Praxair Technology, Inc. VOC reduction in ethanol plants

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2157383A5 (fr) * 1971-10-11 1973-06-01 Svenska Flaektfabriken Ab
FR2206478A1 (fr) * 1972-11-09 1974-06-07 Boehler Zenkner Stroemtech
DE2300381A1 (de) * 1973-01-05 1974-07-25 Vits Maschinenbau Gmbh Verfahren und anlage zur reinigung der abluft eines trockners
US3936951A (en) * 1973-08-24 1976-02-10 Otto Durr Kg Method of and apparatus for heating circulating air in drying equipment
GB2000263A (en) * 1977-06-22 1979-01-04 Brueckner Apparatebau Gmbh Process for heat treating a fabric web
FR2425043A1 (fr) * 1978-05-03 1979-11-30 Gourmelen Jacqueline Procede et dispositif de sechage pour produits d'origine vegetale tels que pulpe de betterave, luzerne, herbe, etc.
GB2186670A (en) * 1986-02-18 1987-08-19 Monforts Gmbh & Co A Textile machine having a continuous convective heat treatment
DE4036666A1 (de) * 1989-11-20 1991-05-23 Kurt Gisiger Verfahren und vorrichtung fuer das trocknen von organischen stoffen, insbesondere von holzteilchen
EP0459603A1 (fr) 1990-06-01 1991-12-04 Körting Hannover Ag Procédé et dispositif pour le séchage continu de copeaux de bois, de fibres de bois ou d'autres matières en vrac
EP0508546A1 (fr) * 1991-04-08 1992-10-14 VandenBroek International B.V. Dispositif de séchage
EP0457203B1 (fr) 1990-05-18 1993-09-29 SC Technology AG Procédé de séchage sans émissions d'une substance dans un tambour de séchage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1191299B (de) * 1960-07-23 1965-04-15 Glanzstoff Ag Verfahren zur kontinuierlichen Trocknung von Schnitzelgut aus organischen Hochpolymeren
US4132007A (en) * 1977-08-17 1979-01-02 Voorheis James T Single burner heater and incinerator
AT399044B (de) * 1988-05-10 1995-03-27 Kaindl Holzindustrie Verfahren und vorrichtung zur emissionsarmen trocknung von holzspänen

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2157383A5 (fr) * 1971-10-11 1973-06-01 Svenska Flaektfabriken Ab
FR2206478A1 (fr) * 1972-11-09 1974-06-07 Boehler Zenkner Stroemtech
DE2300381A1 (de) * 1973-01-05 1974-07-25 Vits Maschinenbau Gmbh Verfahren und anlage zur reinigung der abluft eines trockners
US3936951A (en) * 1973-08-24 1976-02-10 Otto Durr Kg Method of and apparatus for heating circulating air in drying equipment
GB2000263A (en) * 1977-06-22 1979-01-04 Brueckner Apparatebau Gmbh Process for heat treating a fabric web
FR2425043A1 (fr) * 1978-05-03 1979-11-30 Gourmelen Jacqueline Procede et dispositif de sechage pour produits d'origine vegetale tels que pulpe de betterave, luzerne, herbe, etc.
GB2186670A (en) * 1986-02-18 1987-08-19 Monforts Gmbh & Co A Textile machine having a continuous convective heat treatment
DE4036666A1 (de) * 1989-11-20 1991-05-23 Kurt Gisiger Verfahren und vorrichtung fuer das trocknen von organischen stoffen, insbesondere von holzteilchen
EP0457203B1 (fr) 1990-05-18 1993-09-29 SC Technology AG Procédé de séchage sans émissions d'une substance dans un tambour de séchage
EP0459603A1 (fr) 1990-06-01 1991-12-04 Körting Hannover Ag Procédé et dispositif pour le séchage continu de copeaux de bois, de fibres de bois ou d'autres matières en vrac
EP0508546A1 (fr) * 1991-04-08 1992-10-14 VandenBroek International B.V. Dispositif de séchage

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0851194A3 (fr) * 1996-12-23 1998-08-26 Starcosa - Tag Sécheur avec purification de gaz d'échappement par post-combustion thermique
US6931757B2 (en) 2000-11-14 2005-08-23 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. Method for conditioning fibrous substances
WO2002040932A1 (fr) * 2000-11-14 2002-05-23 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procede pour traiter des substances fibreuses
EP1314943A1 (fr) * 2001-11-23 2003-05-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procédé pour traiter des substances fibreuses
EP1363097A1 (fr) 2002-05-13 2003-11-19 Robert Dr. Bankwitz Séchoir centrifuge pneumatique
EP1843114A1 (fr) * 2006-04-06 2007-10-10 Swedish Exergy Consulting AB Installation de séchage
WO2007115771A1 (fr) * 2006-04-06 2007-10-18 Swedish Exergy Consulting Ab Installation à séchoir
EP2078911A1 (fr) 2008-01-10 2009-07-15 Kronospan CR, spol. s.r.o. Procédé destiné au séchage en continu de matériaux en vrac, en particulier de fibres de bois et/ou de copeaux de bois
US20110030235A1 (en) * 2008-01-10 2011-02-10 Zdenek Brancuzsky Method for continuously drying bulk goods, in particular wood fibers and/or wood chips
US10551121B2 (en) 2008-01-10 2020-02-04 Douglas Technical Limited Method for continuously drying bulk goods, in particular wood fibers and/or wood chips
WO2009087108A1 (fr) * 2008-01-10 2009-07-16 Kronospan Cr, Spol. S.R.O. Procédé de séchage continu de matière en vrac, en particulier de fibres de bois et/ou de copeaux de bois
EP2388542A2 (fr) 2008-01-10 2011-11-23 Douglas Technical Limited Procédé destiné au séchage en continu de matériaux en vrac, en particulier de fibres de bois et/ou de copeaux de bois
EP2388542A3 (fr) * 2008-01-10 2011-12-28 Douglas Technical Limited Procédé destiné au séchage en continu de matériaux en vrac, en particulier de fibres de bois et/ou de copeaux de bois
US10690409B2 (en) 2008-01-10 2020-06-23 Douglas Technical Limited Method for continuously drying bulk goods, in particular wood fibers and/or wood chips
EP2230477A1 (fr) * 2009-03-10 2010-09-22 Kronotec AG Installation de séchage de copeaux de bois destinée à sécher des copeaux de bois et procédé correspondant destiné à sécher des copeaux de bois
WO2010102736A1 (fr) * 2009-03-10 2010-09-16 Kronotec Ag Installation destinée à sécher des copeaux de bois et procédé associé pour sécher des copeaux de bois
US8832959B2 (en) 2009-03-10 2014-09-16 Kronotec Ag Wood chip drying system for drying wood chip and associated method for drying wood chip
EP2411749A4 (fr) * 2009-03-25 2016-01-20 Saxlund Internat Holding Ab Système et procédé de séchage
DE102010012005A1 (de) * 2010-03-15 2011-09-15 Dürr Systems GmbH Thermische Abluftreinigungsanlage
EP2889537A1 (fr) * 2013-12-04 2015-07-01 Rupert Kaindl Installation de séchage et installation de combustion
WO2018157949A1 (fr) 2017-03-03 2018-09-07 Douglas Technical Limited Appareil et procédé de séchage continu de produits en vrac, en particulier de copeaux de bois et/ou de fibres de bois comprenant un brûleur multicombustible doté d'un système de refroidissement de moufle
WO2018157947A1 (fr) 2017-03-03 2018-09-07 Douglas Technical Limited Appareil et procédé de séchage continu de produits en vrac, en particulier de copeaux de bois et/ou de fibres de bois, comprenant un échangeur de chaleur
US11079106B2 (en) 2017-03-03 2021-08-03 Douglas Technical Limited Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising multi-fuel burner with a muffle cooling system
US11248845B2 (en) 2017-03-03 2022-02-15 Douglas Technical Limited Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a heat exchanger
US11499778B2 (en) 2017-03-03 2022-11-15 Douglas Technical Limited Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a solid fired hot gas generator
US11543124B2 (en) 2017-03-03 2023-01-03 Kronoplus Limited Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a hot gas cyclone
US11384981B2 (en) 2017-06-06 2022-07-12 Kronoplus Limited Apparatus and method for continuously drying bulk goods

Also Published As

Publication number Publication date
EP0714006B1 (fr) 1997-12-29
DE59501167D1 (de) 1998-02-05
US5697167A (en) 1997-12-16
ATE161622T1 (de) 1998-01-15
CA2163305A1 (fr) 1996-05-25

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