DE2800238A1 - Wood drying process - washes vapour and dust to prevent fire or explosion - Google Patents
Wood drying process - washes vapour and dust to prevent fire or explosionInfo
- Publication number
- DE2800238A1 DE2800238A1 DE19782800238 DE2800238A DE2800238A1 DE 2800238 A1 DE2800238 A1 DE 2800238A1 DE 19782800238 DE19782800238 DE 19782800238 DE 2800238 A DE2800238 A DE 2800238A DE 2800238 A1 DE2800238 A1 DE 2800238A1
- Authority
- DE
- Germany
- Prior art keywords
- drying
- dust
- gases
- drying process
- explosion
- 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
Links
Classifications
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- 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
- F26B25/009—Alarm systems; Safety sytems, e.g. preventing fire and explosions
-
- 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
- F26B23/005—Heating arrangements using waste heat recovered from dryer exhaust gases using a closed cycle heat pump system ; using a heat pipe system
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
-
- 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
Abstract
Description
.0-.0-
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Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Sitz München, Leonrodstr. 54, 8000 München 19Fraunhofer Society for the Promotion of Applied Research e.V., Headquarters Munich, Leonrodstrasse 54, 8000 Munich 19
Verfahren zur Verringerung der Brand- und Explosionsgefahr beim Trocknen korn-, span- oder faserförmiger StoffeProcess to reduce the risk of fire and explosion when drying granular, chip or fibrous materials
Die Erfindung betrifft ein Verfahren, bei dem die Brand- und Explosionsgefahr beim Trocknen von korn-, span- oder faserförmigen Stoffen, welche Staub enthalten, wie z.B. Holzspäne oder -fasern für die Herstellung von Holzwerkstoffen wesentlich vermindert werden.The invention relates to a method in which there is a risk of fire and explosion when drying grains, chips or fibers Substances that contain dust, such as wood chips or fibers, are essential for the manufacture of wood-based materials be reduced.
Als Medium für die Trocknung derartiger Stoffe, die Wasser oder sonstige flüssige Bestandteile enthalten, wird derzeit im allgemeinen ein erhitztes Gas verwendet. Die Erhitzung desselben erfolgt entweder indirekt über Wärmetauscher oder direkt durch Brenngase, welche durch Verbrennung fester, flüssiger oder gasförmiger Stoffe mit Luft in einer Brennkammer erzeugt werden. Es werden dabei entweder reine Brenngase, Brenngas-Frischluft-Gemische oder Brenngas-Umluft-Gemische erzeugt und durch den zu trocknenden Stoff geleitet. Dabei werden die im Stoff enthaltenden flüssigen Bestandteile verdampft. Diese verdampften Bestandteile der Stoffe werden im allgemeinen von den Trocknungsanlagen emittiert.As a medium for the drying of such substances, which contain water or other liquid components, is currently a heated gas is generally used. The heating takes place either indirectly via heat exchangers or directly by combustion gases, which are produced by burning solid, liquid or gaseous substances with air in a combustion chamber be generated. Either pure fuel gases, fuel gas / fresh air mixtures or fuel gas / circulating air mixtures are used generated and passed through the fabric to be dried. The liquid components contained in the substance are evaporated. These vaporized constituents of the substances are generally emitted from the drying systems.
Eine Begrenzung der Emission von Staub wird bisher durch besondere Hochleistungsabscheider oder Naßentstaubungsanlagen nur an den Abgasen vorgenommen, welche emittiert werden. Der Anteil der Abgase, welche den Brenngasen zugemischt und so wieder in den Trocknungsprozeß zurückgeführt werden, wird nicht entstaubt. Ein Teil dieses Staubes lagert sich in den Rohren ab, ein anderer durchläuft den Trocknungsprozeß mehrmals. Durch thermische Zersetzung dieses Staubes entstehen die in den emittierten Abgasen enthaltenen geruchsbelästigenden Stoffe. Belastungsschwankungen infolge stark schwankenden Feuchtegehaltes oder ausbleibende Belastung infolge einer Unterbrechung der Zufuhr des zu trocknenden Mediums führenA limitation of the emission of dust is so far by special High-performance separators or wet dedusting systems are only made on the exhaust gases that are emitted. Of the Share of the exhaust gases that are mixed with the fuel gases and thus fed back into the drying process not dusted. Part of this dust is deposited in the pipes, another part goes through the drying process several times. Thermal decomposition of this dust creates the odor nuisance contained in the emitted exhaust gases Fabrics. Load fluctuations as a result of strongly fluctuating moisture content or lack of exposure as a result of a Interrupt the supply of the medium to be dried
- 2 909827/0562 - 2 909827/0562
zu Betriebssituationen, in denen die Temperatur und der Sauerstoffgehalt im Trockner so hoch sind, daß zusammen mit dem übertrockneten, abgelagerten Staub brennbare oder explosive Gemische entstehen können. Die Erfahrung hat gezeigt, daß dadurch häufig Brände und Explosionen an Trocknungsanlagen hervorgerufen werden.to operating situations in which the temperature and the oxygen content are so high in the dryer that, together with the overdried, deposited dust, they are flammable or explosive Mixtures can arise. Experience has shown that this often causes fires and explosions in drying systems will.
Die Erfindung hat die Aufgabe, die Gefahr von Bränden und Explosionen bei der Trocknung von korn-, span- oder faserförmigem Gut auf möglichst wirtschaftliche Weise zu vermindern.The invention aims to reduce the risk of fire and explosions when drying grains, chips or fibers Well to reduce in the most economical way possible.
Dies wird erfindungsgemäß dadurch erreicht, daß alle mit den verdampften Anteilen und dem Staub der zu trocknenden Stoffe aufgeladenen Abgase gereinigt werden und ein Teil der beim Trocknungsprozeß verdampften Flüssigkeit kondensiert wird. Die Reinigung erfolgt z.B. mittels einer Waschflüssigkeit, welche Staub und geruchsbelästigende Stoffe bindet und in der ein Teil der aus dem Trockenmedium verdampften Flüssigkeit wieder kondensiert. Die dabei anfallende Kondensationswärme wird über Wärmepumpen und Wärmetauscher an den Anteil der Abgase (Rückgase) wieder abgegeben, der wieder in den Trocknungskreislauf zurückgeführt wird.This is achieved according to the invention in that all with the vaporized fractions and the dust of the substances to be dried charged exhaust gases are cleaned and part of the liquid evaporated during the drying process is condensed. The cleaning takes place e.g. by means of a washing liquid, which binds dust and odorous substances and is in the part of the liquid evaporated from the drying medium condenses again. The resulting heat of condensation is released via heat pumps and heat exchangers to the proportion of exhaust gases (return gases) that is returned to the drying cycle is returned.
Da bei vielen Stoffen zur Trocknung wegen der damit verbundenen Reduzierung der Brand- und Explosionsgefahr ein Inertgas (stark reduzierter Sauerstoffgehalt) besondere Vorteile bietet, kann zusätzlich im Abgasstrom eine Drossel vorgesehen werden, durch welche der Druck der sich im Kreislauf befindenden Trocknungsgase so weit erhöht wird, daß an keiner Stelle des Systems ein Unterdruck gegenüber dem Druck der umgebenden Luft entsteht. Um Druckdifferenzen im System möglichst klein zu halten, können statt eines Ventilators mehrere Ventilatoren vorgesehen werden. Da die größten Unterdrücke immer vor den Ventilatoren auftreten,können hier Sensoren angebracht werden, welche die Drosselung der Abluft in Verbindung mit einem Regelsystem regeln. Dadurch, daß erfindungsgemäß nichtSince an inert gas is used for drying many substances because of the associated reduction in the risk of fire and explosion (greatly reduced oxygen content) offers particular advantages, a throttle can also be provided in the exhaust gas flow through which the pressure of the drying gases in the circuit is increased so much that at no point the system creates a negative pressure compared to the pressure of the surrounding air. To avoid pressure differences in the system as much as possible To keep it small, several fans can be provided instead of one fan. Since the greatest oppressions always occur in front of the fans, sensors can be attached here, which in conjunction with the throttling of the exhaust air regulate a control system. Because according to the invention not
- 3 909827/0552 - 3 909827/0552
Λ-Λ-
nur - wie es bisher zum Teil üblich ist - den Abgasen, welche emittiert werden, durch Kondensation der überwiegende Teil der im Trockenvorgang verdampften Bestandteile entzogen wird, sondern auch den Rückgasen, wird in diesen und damit auch in den Trocknungsgasen der Taupunkt bzw. die relative Feuchte der Gase verringert. Wie aus der Fachliteratur bekannt ist, wird dadurch (s. Holztechnologie 17 (1976) 1, S. 3 bis 9; B. Meyer "Zum Verhalten von Holzpartikeln in Heißluft - Wasserdampf Gemischen. Ein Beitrag zur Verbesserung der Spantrocknung in Spanplattenwerken. Teil II: Laborversuche zum Trocknungsverhalten von Holzspänen.") eine höhere Trocknungsgeschwindigkeit erreicht. Bei gleichem Energieaufwand dürfte daher ein höherer Durchsatz zu erreichen sein. Darüber hinaus sinkt die Emission von Staub und geruchsbelästigenden Stoffen.only - as has been customary up to now - the predominant part of the exhaust gases that are emitted through condensation In the drying process evaporated constituents is withdrawn, but also from the return gases, is in these and thus also in the Drying gases the dew point or the relative humidity of the gases is reduced. As is known from the specialist literature, this becomes (See Holz Technologie 17 (1976) 1, pp. 3 to 9; B. Meyer "On the behavior of wood particles in hot air - water vapor mixtures. A contribution to improving chip drying in chipboard plants. Part II: Laboratory tests on drying behavior of wood chips. ") a higher drying speed is achieved. With the same energy expenditure, a higher throughput can be achieved. In addition, the emission of dust and odorous substances is reduced.
Anhand eines in der Zeichnung vereinfacht dargestellten Beispiels der Trocknung von Spänen mit einem Düsenrohrtrockner soll das Prinzip der Erfindung nachfolgend erläutert werden:Using an example, shown in simplified form in the drawing, of the drying of chips with a nozzle tube dryer the principle of the invention is to be explained below:
In der Brennkammer 1 werden Brenngase erzeugt, die mit dem Rückgas 2 vermischt werden. Dieses Gemisch wird dem Trockenraum des Düsenrohrtrockners 3 zugeführt, in den auch die feuchten Späne über die Einfallschleuse 4 eingegeben werden. Späne und Trocknungsgase werden mit dem Ventilator 5 in den Zyklon 6 befördert, in welchem über die Ausfallschleuse 7 die Späne wieder austreten. Die Gase passieren dann einen Wäscher 8, in welchem im Gasstrom verbliebene staubförmige Bestandteile vom Wasser gebunden und die im Trockner verdampften Stoffe 9 kondensiert werden.Combustion gases which are mixed with the return gas 2 are generated in the combustion chamber 1. This mixture becomes the drying room of the nozzle tube dryer 3 supplied, in which also the moist Chips can be entered via the intake sluice 4. Chips and drying gases are fed into the cyclone 6 with the fan 5 conveyed, in which the chips emerge again via the discharge lock 7. The gases then pass a scrubber 8 in which Dust-like constituents remaining in the gas stream are bound by the water and the substances 9 evaporated in the dryer are condensed will.
Der Wasserkreislauf 16 wird zu diesem Zweck im Wärmetauscher 13 gekühlt und im Gegenstrom durch das Gas geleitet. Das Kühlwasser mit dem Kondensat 9 sammelt sich im unteren Teil des Wäschers 8 und wird nach einer Filterung im Filter 15 wieder dem Wärmetauscher 13 zugeführt. Eine Überschußmenge 17 wird dabei abgeleitet. Das gekühlte Gas teilt sich dann in einen Abgas- 10 und einen Rückgasstrom 11. Dem Wärmetauscher 12For this purpose, the water circuit 16 is in the heat exchanger 13 cooled and passed through the gas in countercurrent. The cooling water with the condensate 9 collects in the lower part of the washer 8 and is fed back to the heat exchanger 13 after filtering in the filter 15. An excess amount 17 becomes thereby derived. The cooled gas then divides into an exhaust gas 10 and a return gas stream 11. The heat exchanger 12
- 4 909827/0552 - 4 909827/0552
wird über eine Wärmepumpe 14 die im Wärmetauscher 13 aufgenommene Wärme mit einem entsprechend höheren Temperaturniveau wieder zugeführt und damit das Rückgas 11 aufgeheizt.is received in the heat exchanger 13 via a heat pump 14 Heat is supplied again at a correspondingly higher temperature level and thus the return gas 11 is heated.
909827/0552909827/0552
LeerseiteBlank page
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2800238A DE2800238C2 (en) | 1978-01-04 | 1978-01-04 | Plant for drying granular, chip or fibrous materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2800238A DE2800238C2 (en) | 1978-01-04 | 1978-01-04 | Plant for drying granular, chip or fibrous materials |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2800238A1 true DE2800238A1 (en) | 1979-07-05 |
DE2800238C2 DE2800238C2 (en) | 1987-10-01 |
Family
ID=6028939
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2800238A Expired DE2800238C2 (en) | 1978-01-04 | 1978-01-04 | Plant for drying granular, chip or fibrous materials |
Country Status (1)
Country | Link |
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DE (1) | DE2800238C2 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0293626A1 (en) * | 1987-06-04 | 1988-12-07 | HANS PESCH GMBH & CO. KG | Drying plant for bulk material |
EP0385372A1 (en) * | 1989-02-27 | 1990-09-05 | FRITZ EGGER GESELLSCHAFT m.b.H. | Process and apparatus for drying wood chips |
EP0523684A1 (en) * | 1991-07-16 | 1993-01-20 | FRITZ EGGER GESELLSCHAFT m.b.H. | Process and apparatus for heat recovery from drying plants or waste air purification plants |
WO1993024800A1 (en) * | 1992-05-22 | 1993-12-09 | Andritz Tcw Engineering Gmbh | Sludge drying system with recycling exhaust air |
EP1418394A2 (en) * | 2002-11-08 | 2004-05-12 | Binder & Co. Aktiengesellschaft | Process for drying flammable material |
CN105180640A (en) * | 2015-10-19 | 2015-12-23 | 东北林业大学 | Multi-parameter monitoring wood-drying method |
CN105627699A (en) * | 2016-04-05 | 2016-06-01 | 中南林业科技大学 | Method and device for drying easily-dried wood |
EP3184946A1 (en) * | 2015-12-23 | 2017-06-28 | Essent Power B.V. | Device for drying wetted material |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4023518A1 (en) * | 1990-07-24 | 1992-03-05 | Fritz Egger Gmbh | METHOD AND SYSTEM FOR DRYING DAMP GOODS |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE310352C (en) * | 1915-12-08 | 1900-01-01 | ||
GB310385A (en) * | 1927-12-24 | 1929-04-24 | George William Riley | Improvements in and relating to the drying of materials |
CH179825A (en) * | 1935-02-13 | 1935-09-30 | Escher Wyss Maschf Ag | Drying system. |
DE846247C (en) * | 1950-03-07 | 1952-08-11 | Bayer Ag | Method of drying under vacuum |
DE896175C (en) * | 1949-05-23 | 1953-11-09 | Albert Edouard Caillat | Process and device for the continuous drying of granular or powdery goods |
US2826397A (en) * | 1952-03-27 | 1958-03-11 | Svenska Flaektfabriken Ab | Scrubbers |
AT233477B (en) * | 1961-07-20 | 1964-05-11 | Buettner Werke Ag | Method for operating a pneumatic dryer, which consists of a horizontal drum-like chamber, and device for carrying out the method |
DE1803259A1 (en) * | 1968-10-16 | 1970-05-14 | Basf Ag | Process for drying explosive or oxygensensit |
DE2300381B2 (en) * | 1973-01-05 | 1975-07-17 | Vits-Maschinenbau Gmbh, 4018 Langenfeld | Method and system for cleaning the exhaust air of a continuous dryer with two drying sections |
-
1978
- 1978-01-04 DE DE2800238A patent/DE2800238C2/en not_active Expired
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE310352C (en) * | 1915-12-08 | 1900-01-01 | ||
GB310385A (en) * | 1927-12-24 | 1929-04-24 | George William Riley | Improvements in and relating to the drying of materials |
CH179825A (en) * | 1935-02-13 | 1935-09-30 | Escher Wyss Maschf Ag | Drying system. |
DE896175C (en) * | 1949-05-23 | 1953-11-09 | Albert Edouard Caillat | Process and device for the continuous drying of granular or powdery goods |
DE846247C (en) * | 1950-03-07 | 1952-08-11 | Bayer Ag | Method of drying under vacuum |
US2826397A (en) * | 1952-03-27 | 1958-03-11 | Svenska Flaektfabriken Ab | Scrubbers |
AT233477B (en) * | 1961-07-20 | 1964-05-11 | Buettner Werke Ag | Method for operating a pneumatic dryer, which consists of a horizontal drum-like chamber, and device for carrying out the method |
DE1803259A1 (en) * | 1968-10-16 | 1970-05-14 | Basf Ag | Process for drying explosive or oxygensensit |
DE2300381B2 (en) * | 1973-01-05 | 1975-07-17 | Vits-Maschinenbau Gmbh, 4018 Langenfeld | Method and system for cleaning the exhaust air of a continuous dryer with two drying sections |
Non-Patent Citations (5)
Title |
---|
DE-Z.: Holztechnologie 17, 1976, 1, S. 3-9 * |
DE-Z.: Siempelkamp-Prospekt, (ohne Angabe des Erscheinungsdatums) * |
DE-Z: Holz als Roh- und Werkstoff, 40, 1982, S. 287-291 * |
DE-Z: VDI-Berichte, Nr. 397, 1981, S. 49-53 * |
Die Wärmepumpe-ein Weg zur Energieersparnis, Auszug aus VDI-Nachrichten v. 16.03.57, Nr. 6, S. 3, abgedruckt in: VDI-Statusbericht Wärme- pumpe, S. 46-50, VDI-Verlag GmbH, Düsseldorf 1976 * |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0293626A1 (en) * | 1987-06-04 | 1988-12-07 | HANS PESCH GMBH & CO. KG | Drying plant for bulk material |
EP0385372A1 (en) * | 1989-02-27 | 1990-09-05 | FRITZ EGGER GESELLSCHAFT m.b.H. | Process and apparatus for drying wood chips |
EP0523684A1 (en) * | 1991-07-16 | 1993-01-20 | FRITZ EGGER GESELLSCHAFT m.b.H. | Process and apparatus for heat recovery from drying plants or waste air purification plants |
WO1993024800A1 (en) * | 1992-05-22 | 1993-12-09 | Andritz Tcw Engineering Gmbh | Sludge drying system with recycling exhaust air |
EP1418394A2 (en) * | 2002-11-08 | 2004-05-12 | Binder & Co. Aktiengesellschaft | Process for drying flammable material |
EP1418394A3 (en) * | 2002-11-08 | 2006-03-29 | Binder & Co. Aktiengesellschaft | Process for drying flammable material |
CN105180640A (en) * | 2015-10-19 | 2015-12-23 | 东北林业大学 | Multi-parameter monitoring wood-drying method |
CN105180640B (en) * | 2015-10-19 | 2017-07-07 | 东北林业大学 | The method for drying wood of multi-parameter monitoring |
EP3184946A1 (en) * | 2015-12-23 | 2017-06-28 | Essent Power B.V. | Device for drying wetted material |
CN105627699A (en) * | 2016-04-05 | 2016-06-01 | 中南林业科技大学 | Method and device for drying easily-dried wood |
Also Published As
Publication number | Publication date |
---|---|
DE2800238C2 (en) | 1987-10-01 |
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