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WO1994025812A1 - Procede et dispositif permettant de secher de maniere peu polluante des copeaux de bois ou des matieres organiques analogues - Google Patents

Procede et dispositif permettant de secher de maniere peu polluante des copeaux de bois ou des matieres organiques analogues Download PDF

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Publication number
WO1994025812A1
WO1994025812A1 PCT/EP1994/001347 EP9401347W WO9425812A1 WO 1994025812 A1 WO1994025812 A1 WO 1994025812A1 EP 9401347 W EP9401347 W EP 9401347W WO 9425812 A1 WO9425812 A1 WO 9425812A1
Authority
WO
WIPO (PCT)
Prior art keywords
dryer
drying
exhaust gas
final
gas
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.)
Ceased
Application number
PCT/EP1994/001347
Other languages
German (de)
English (en)
Inventor
Harald Böhler
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.)
Fritz Egger GmbH and Co OG
Original Assignee
Fritz Egger GmbH and Co OG
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 Fritz Egger GmbH and Co OG filed Critical Fritz Egger GmbH and Co OG
Publication of WO1994025812A1 publication Critical patent/WO1994025812A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F26B23/00—Heating arrangements
    • F26B23/001—Heating arrangements using waste heat
    • F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
    • 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
    • F26B25/005—Treatment of dryer exhaust gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the invention relates to a method and a device as described in the preamble of claim 1 and claim 11, respectively, which are already known from EP 420 859 B1.
  • drying material When drying wood, wood shavings or the like material, hereinafter referred to as drying material, ingredients are released from the drying material. These released wood constituents are predominantly organic substances, namely hydrocarbon compounds. If wood drying is carried out at temperatures below 100 ° C or even below approx. 130 ° C, the wood contents released are those that also escape naturally from wood that has not yet gone into decay. These substances, hereinafter referred to as released natural ingredients, are generally unproblematic and environmentally friendly.
  • the situation is different with the wood constituents which are released at drying temperatures of above approximately 100 ° C. or above 130 ° C. These substances are referred to below as released non-natural ingredients.
  • the corresponding temperature value fluctuates in dependence on the type of wood, the place of growth, the wood age and other such parameters.
  • the release of non-natural wood constituents increases with increasing temperature and also with longer dwell time of the material to be dried in the relevant temperature range.
  • a temperature between 100 ° C. and 130 ° C. can be regarded as the temperature at which the release of non-natural wood constituents begins.
  • the exhaust gas leaving the pre-dryer is passed after separation from the pre-dried chips through a second burner operated with natural gas, which produces hot gases of 750 to 800 ° C and in the combustion chamber of which a catalyst is also present to prevent the oxidation or To cause combustion of the organic matter from the wood chips.
  • the hot gases of the second burner are passed through a waste heat boiler and then released into the atmosphere as cleaned exhaust gas via a scrubber operated as a condenser. Heat is obtained in the waste heat boiler for preheating the hot air supplied to the final dryer, for reheating the cleaned exhaust gas discharged into the atmosphere, for press heating, for indirectly heating the final dryer and for operating a steam turbine.
  • the object of the invention is to carry out the drying in such a way that both a high drying performance and a low environmental impact are achieved in a simple manner and with a comparatively low system and operating outlay.
  • the invention is based on the knowledge already mentioned that the exhaust gas from a low-temperature dryer for wood chips contains essentially only released natural wood constituents, so that this exhaust gas requires no or at least no intensive aftertreatment or decomposition or separation of wood constituents and under Relief of the entire process can be released to the atmosphere in a short way.
  • the non-natural wood constituents emerge with increasing degree of dryness, so that it is expedient to carry out the predrying as low-temperature drying and the final drying as high-temperature drying and only the exhaust gas from the high-temperature Subsequent drying to undergo decomposition or excretion of the (non-natural) wood contents.
  • the exhaust air from the low-temperature predrying essentially has only natural wood constituents and can accordingly be introduced into the atmosphere without further ado or at least with comparatively little cleaning effort.
  • Simplifying in this process according to the invention also has the effect that the heat requirement of the overall process can be covered by a single burner assigned to the final dryer, since the comparatively low heat requirement of the low-temperature pre-dryer can possibly be achieved with the exhaust gas from the final dryer can be supplied. Possibly. the heat from the exhaust gas of the final dryer can at least partially be given off indirectly to the pre-dryer.
  • the two-stage drying process according to the invention thus combines a high drying performance that can be achieved by using even high-temperature hot gases with environmental friendliness, since no non-natural or only natural wood constituents are released and the required decomposition or separation of non-natural wood constituents relates to the exhaust gas the high temperature final drying is limited. This simplifies the procedure and the system required for this.
  • Figure 1 shows a basic version of the two-stage drying plant for wood chips
  • Figure 2 is a drying system expanded compared to Figure 1 by an exhaust gas washer and an indirect heat transfer to the pre-dryer.
  • FIG. 1 shows a pre-dryer 1 in the form of a belt conveyor with a rotating conveyor belt 2.
  • An end dryer 3 is connected via a hot gas line 4 to a burner 5, to which fuel and combustion air are supplied in the usual way (not shown).
  • the end dryer 3 is heated directly, but instead, or additionally, indirect heating can be provided.
  • a transfer line 6 with a delivery fan 7 leads from the final dryer 3 to a cyclone separator 8.
  • the path of the wood chips through the system is shown by the chip path 9 as a line-like double line with flow arrows.
  • the moist chips are fed to the pre-dryer 1 via the feed line 10 in order to form a drying material layer 11 on the upper run of the running conveyor belt 2 and to be pre-dried.
  • the chips pass through the transport line 12 into the final dryer 3, in which they are mixed with the hot gases from the burner 5 and finally dried, in order then to reach the cyclone separator 8 through the transfer line 6.
  • the finished, dried chips emerge from this through the discharge line 13 and are then used for further use, for example for pressing into chipboard.
  • this exhaust gas is fed to the pre-dryer 1 and guided there in such a way that it rises through the upper run of the porous conveyor belt 2 of the pre-dryer 1 and thus through the drying material layer 11 located on the upper run. In this way, the heat contained in the exhaust gas is used directly for pre-drying in the pre-dryer 1. The exhaust gas is then released into the atmosphere in a manner not shown.
  • a treatment device 15 is installed in the exhaust gas line 14, which serves to remove wood constituents contained in the exhaust gas, which originate from the final drying in the final dryer 3. This can be done in any way by means of known techniques, for example by means of thermal and / or catalytic decomposition of the relevant organic substances (hydrocarbons) or by separation, for example by chemical means or by cooling or condensation. As shown, the exhaust gas flowing through the exhaust gas line 14 is shown in the treatment device 15
  • Fresh air is supplied via a fresh air supply line 16.
  • the metered supply of fresh air allows the temperature of the gas entering the pre-dryer 1 to be adjusted in the desired manner influenced and at the same time the absorption capacity of the gas for moisture can be improved.
  • the system is operated, for example, in such a way that the exhaust gas entering the pre-dryer 1 has a temperature which is comparatively low for drying, in the order of 100 ° C. In this way it is ensured that no pre-natural ingredients are released from the chips in the pre-dryer 1.
  • the pre-dried wood chips are dried with hot gas from the burner 5, which has a temperature of, for example, 500 or 550 ° C., adapted to the dryer concept and the required dryer power. Although non-natural wood constituents are released, these are subsequently separated, decomposed or otherwise removed in the treatment device 15, so they do not reach the atmosphere with the remaining exhaust gas via the pre-dryer 1.
  • a scrubber 17 is connected into the exhaust line 14 between the cyclone separator 8 and the treatment device 15, through which washing liquid is circulated by means of a circulation pump 18, which is sprayed in via nozzles 19 and collects in the laundry sump 20 as indicated.
  • a heat-absorbing heat exchanger 21 is arranged in the laundry sump 20 and is connected via a heat transfer circuit 22 to a circulating pump 23 to a heat-emitting heat exchanger 24.
  • fresh air supplied is heated via a feed line 25, for example also to approx. 100 ° C., which is then passed through the drying material layer 11, as already explained for the exhaust gas flowing through the exhaust gas line 14, which in this way also indirectly from the Exhaust heat is supplied to increase the predrying performance.
  • FIG. 2 also shows a compressor 26 with which the heated fresh air and the exhaust gas supplied through the exhaust gas line 14 are sucked in through the drying material layer 11 in the pre-dryer 1 and then released, for example, to a chimney (not shown).
  • the heat originating from the exhaust gas and introduced into the heat transfer circuit 22 can of course also be used in whole or in part for other purposes, in particular if there is a large amount of heat due to condensation in the scrubber 17. Furthermore, the use for heat generated at a comparatively low temperature can be expanded in a manner known per se through the use of heat pumps or other heat displacement systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Des copeaux de bois sont préséchés dans un présécheur (1) à une température maximale de 130 °C. Les copeaux préséchés sont ensuite acheminés jusqu'à un séchoir terminal (3) chauffé au moyen d'un brûleur (5). Après évacuation des copeaux de bois, les gaz brûlés du séchoir terminal (3) passent par un dispositif de traitement (15) où les substances ligneuses organiques contenues dans les gaz brûlés sont décomposés de manière thermique/catalytique ou sont extraites d'une manière ou d'une autre. Les gaz brûlés ainsi épurés sont acheminés sous forme de gaz de séchage à basse température (130 °C maximum) à travers le présécheur (1), afin d'y fournir la chaleur requise pour le préséchage.
PCT/EP1994/001347 1993-04-28 1994-04-28 Procede et dispositif permettant de secher de maniere peu polluante des copeaux de bois ou des matieres organiques analogues Ceased WO1994025812A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4313972.8 1993-04-28
DE4313972A DE4313972A1 (de) 1993-04-28 1993-04-28 Verfahren und Vorrichtung zur emissionsarmen Trocknung von Holzspänen oder vergleichbarem organischen Trocknungsgut

Publications (1)

Publication Number Publication Date
WO1994025812A1 true WO1994025812A1 (fr) 1994-11-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1994/001347 Ceased WO1994025812A1 (fr) 1993-04-28 1994-04-28 Procede et dispositif permettant de secher de maniere peu polluante des copeaux de bois ou des matieres organiques analogues

Country Status (2)

Country Link
DE (1) DE4313972A1 (fr)
WO (1) WO1994025812A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999009364A1 (fr) * 1997-08-14 1999-02-25 Valmet Fibertech Ab Procede en deux phases de sechage d'une matiere en bois brut
AT409184B (de) * 2000-01-20 2002-06-25 Muehlboeck Kurt Verfahren und vorrichtung zur holztrocknung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202200015528A1 (it) * 2022-07-22 2024-01-22 Imal Srl Impianto per la lavorazione del legno

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2011597A (en) * 1977-06-28 1979-07-11 Allfeld & Egloff Lupofresh After-drying hops pellets
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.
US4431405A (en) * 1982-02-23 1984-02-14 Down River International, Inc. Gas pollution control apparatus and method and wood drying system employing same
DE3842479A1 (de) * 1988-12-16 1990-06-21 Baehre & Greten Verfahren und anlage zur rueckgewinnung der in trocknungsabgasen eines holzspaene- oder dergleichen trockners enthaltenen waermeenergie
EP0385372A1 (fr) * 1989-02-27 1990-09-05 FRITZ EGGER GESELLSCHAFT m.b.H. Procédé et dispositif pour le séchage de copeaux de bois
CH677527A5 (en) * 1989-02-15 1991-05-31 Hydrotechnik Gmbh Wood drying plant for chipboard mfr. - uses mechanical compression for removing moisture before final drying

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2011597A (en) * 1977-06-28 1979-07-11 Allfeld & Egloff Lupofresh After-drying hops pellets
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.
US4431405A (en) * 1982-02-23 1984-02-14 Down River International, Inc. Gas pollution control apparatus and method and wood drying system employing same
DE3842479A1 (de) * 1988-12-16 1990-06-21 Baehre & Greten Verfahren und anlage zur rueckgewinnung der in trocknungsabgasen eines holzspaene- oder dergleichen trockners enthaltenen waermeenergie
CH677527A5 (en) * 1989-02-15 1991-05-31 Hydrotechnik Gmbh Wood drying plant for chipboard mfr. - uses mechanical compression for removing moisture before final drying
EP0385372A1 (fr) * 1989-02-27 1990-09-05 FRITZ EGGER GESELLSCHAFT m.b.H. Procédé et dispositif pour le séchage de copeaux de bois

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999009364A1 (fr) * 1997-08-14 1999-02-25 Valmet Fibertech Ab Procede en deux phases de sechage d'une matiere en bois brut
US6357144B1 (en) 1997-08-14 2002-03-19 Valmet Fibertech Ab Two stage process for drying of raw wood material
AT409184B (de) * 2000-01-20 2002-06-25 Muehlboeck Kurt Verfahren und vorrichtung zur holztrocknung

Also Published As

Publication number Publication date
DE4313972A1 (de) 1994-11-03

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