EP0459603A1 - Process and apparatus for continuous drying of wood chips, wood fibres or other bulk materials - Google Patents

Process and apparatus for continuous drying of wood chips, wood fibres or other bulk materials Download PDF

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Publication number
EP0459603A1
EP0459603A1 EP91250134A EP91250134A EP0459603A1 EP 0459603 A1 EP0459603 A1 EP 0459603A1 EP 91250134 A EP91250134 A EP 91250134A EP 91250134 A EP91250134 A EP 91250134A EP 0459603 A1 EP0459603 A1 EP 0459603A1
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Prior art keywords
combustion chamber
flue gases
dryer
vapors
dried
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EP91250134A
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German (de)
French (fr)
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EP0459603B1 (en
Inventor
Uwe Dr. Wiedmann
Peter Dr. Puppich
Herbert Dipl.-Ing. Krichel
Holger Dipl.-Ing. Zierholz
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Bison Werke Baehre and Greten GmbH and Co KG
Koerting Hannover GmbH
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Bison Werke Baehre and Greten GmbH and Co KG
Koerting Hannover GmbH
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Application filed by Bison Werke Baehre and Greten GmbH and Co KG, Koerting Hannover GmbH filed Critical Bison Werke Baehre and Greten GmbH and Co KG
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    • 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
    • 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 fine fractions of the dried material remaining in the vapors are then fed together with the vapors via a blower 11 to one or more cyclones 12. This is where the fine fractions of the dried material are separated.
  • the vapors leaving the cyclone or cyclones 12 are contaminated with fine dust and the pollutants formed during drying. They are returned to the dryer 8 via the pipeline 13, where they pass through the heat exchanger 7 and are heated up. This closes the almost inert vapor cycle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Drying Of Solid Materials (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Radio Relay Systems (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The process according to the invention, in which the heat from flue gases generated in a combustion chamber is utilised in a drier charged with the material to be dried, is characterised in that the flue gas-free vapours leaving the drier are recirculated to the drier and, upstream of the drier, heated indirectly by the flue gases leaving the combustion chamber to the temperature required for drying the material to be dried, a vapour part-stream being branched off from this circulation and taken to the combustion chamber. <??>The apparatus for carrying out the process provides that, from the cyclone or cyclones (12) used in such processes for precipitating the dry material, a pipe (13) for the vapours leads back to the drier (8), that a heat exchanger (7) for the indirect heating of the vapours by the flue gases leaving the combustion chamber (1) is arranged in the pipe (13), and that a line (6), branching off from the pipe (13) upstream of the heat exchanger (7) in the direction of flow and leading to the combustion chamber (1), is provided. This invention makes it possible, at low cost, to maintain lower pollutant emission limits than those hitherto prescribed, to improve the efficiency and at the same time to reduce the explosion risk. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren und eine Anlage zur kontinuierlichen Trocknung von Holzspänen, Holzfasern oder anderen Schüttgütern, bei dem die Wärme von in einer Brennkammer erzeugten Rauchgasen in einem mit dem zu trocknenden Gut beschickten Trockner ausgenutzt wird.The invention relates to a method and a plant for the continuous drying of wood shavings, wood fibers or other bulk materials, in which the heat of flue gases generated in a combustion chamber is used in a dryer charged with the material to be dried.

Es ist dabei üblich, die Rauchgase unmittelbar in den Trockner einzuleiten.It is customary to introduce the flue gases directly into the dryer.

Bei der Trocknung von Holzspänen, Holzfasern oder anderen Schüttgütern werden organische Schadstoffe freigesetzt, die neben den in den Rauchgasen und Brüden enthaltenen Feinstäuben eine Belastung der Umwelt darstellen. Die den Trockner verlassenden Abgase müssen deshalb vor ihrer Einleitung in die Atmosphäre gereinigt werden. Dies geschieht durch Entstaubung und erforderlichenfalls durch weitere, nachgeschaltete Reinigungsverfahren, wie z.B. Naßentstaubung, Elektrofilter, Tuchfilter, Kiesbettfilter, Spänebettfilter und thermische Nachverbrennung. Mit derartigen Reinigungsverfahren lassen sich zwar die Emissionen verringern, aber hierzu sind hohe Investitions- und Betriebskosten erforderlich.When wood shavings, wood fibers or other bulk materials are dried, organic pollutants are released which, in addition to the fine dust contained in the flue gases and vapors, are a burden on the environment. The exhaust gases leaving the dryer must therefore be cleaned before being discharged into the atmosphere. This is done by dedusting and, if necessary, by further, subsequent cleaning processes, such as wet dedusting, electrostatic filters, cloth filters, gravel bed filters, chip bed filters and thermal afterburning. With such cleaning processes, the emissions can be reduced, but this requires high investment and operating costs.

In der DE-OS 24 61 415 ist eine Trocknungsanlage mit einem direkt durch Rauchgase beheizten Trockner offenbart, wobei die Rauchgase in einer dem Trockner vorgeschalteten Brennkammer erzeugt werden. Das den Trockner verlassende, mit Schadstoffen belastete Gemisch aus Rauchgasen und Brüden wird mittels Zyklonentstaubung gereinigt und anschließend in zwei Teilströme aufgeteilt. Der eine Teilstrom wird zur Brennkammer zurückgeführt und dort zur Verbrennung der Schadstoffe in die heißeste Zone eingedüst, so daß eine intensive Durchmischung mit den Rauchgasen stattfindet, die dann wieder dem Trockner zugeführt werden. Der andere Teilstrom wird über eine Abgasleitung in die Atmosphäre abgegeben.DE-OS 24 61 415 discloses a drying system with a dryer heated directly by flue gases, the flue gases being generated in a combustion chamber upstream of the dryer. The mixture of flue gases and vapors leaving the dryer, which is contaminated with pollutants, is cleaned by means of cyclone dusting and then divided into two partial flows. One part of the stream is returned to the combustion chamber and injected into the hottest zone for the combustion of the pollutants, so that there is intensive mixing with the flue gases, which are then fed back to the dryer. The other partial flow is released into the atmosphere via an exhaust pipe.

Dieses Verfahren hat den Vorteil einer verringerten Abgasmenge, wodurch weniger Schadstoffe die Anlage verlassen, kommt aber, mit Rücksicht auf die gesetzlichen Vorschriften zur Emissionsbegrenzung, auch nicht ohne die oben beschriebenen, zusätzlichen Reinigungsverfahren aus.This method has the advantage of a reduced amount of exhaust gas, which means that fewer pollutants leave the system, but, with due regard to the legal regulations on emission limitation, it also does not manage without the additional cleaning methods described above.

Aufgabe der Erfindung ist es, ein Verfahren und eine Anlage der eingangs genannten Art zu schaffen, wodurch mit geringerem Aufwand als bisher Schadstoff-Emissions-Grenzwerte eingehalten werden können, die kleiner sind als sie bisher vorgeschrieben waren, und wodurch der Wirkungsgrad erhöht und gleichzeitig die Explosionsgefahr vermindert wird.The object of the invention is to provide a method and a system of the type mentioned, whereby pollutant emission limit values can be maintained with less effort than previously, which are smaller than previously prescribed, and which increases the efficiency and at the same time the Risk of explosion is reduced.

Erfindungsgemäß wird diese Aufgabe durch ein Verfahren nach der Lehre des Patentanspruchs 1 gelöst.According to the invention, this object is achieved by a method according to the teaching of claim 1.

Demnach werden die den Trockner verlassenden, schadstoffbelasteten aber rauchgasfreien Brüden im Kreislauf zum Trockner zurückgeführt und als Trockenmittel zur direkten Beheizung des Trockners verwendet. Den dazu erforderlichen Wärmeinhalt erhalten sie durch indirekte Beheizung vor Eintritt in den Trockner. Beheizt wird mit Rauchgasen, die in einer Brennkammer erzeugt werden.Accordingly, the vapors, which are polluted with pollutants but are free of flue gas, are returned to the dryer in the circuit and used as drying agents for direct heating of the dryer. The heat content required for this is obtained by indirect heating before entering the dryer. It is heated with smoke gases that are generated in a combustion chamber.

Diese Brennkammer stellt gleichzeitig die 'Schleuse' für einen Brüden-Teilstrom dar, der aufgrund der im Kreislauf einzuhaltenden Massenbilanz aus diesem abgeführt werden muß, d.h., Schadstoffe können den Kreislauf nur über die Brennkammer verlassen. Dort werden sie verbrannt und liefern auf diese Weise einen Teil der zur Aufheizung des Kreislaufs erforderlichen Energie.At the same time, this combustion chamber is the 'lock' for a vapor partial flow which has to be removed from the circuit due to the mass balance to be maintained, i.e. pollutants can only leave the circuit via the combustion chamber. There they are burned and in this way provide part of the energy required to heat the circuit.

Durch diese Lösung gelingt es, ohne die sonst erforderlichen zusätzlichen Reinigungsverfahren, die in die Atmosphäre abgegebenen Emissionen sowohl von festen als auch von gasförmigen bzw. kondensierten organischen Schadstoffen unter den Grenzwerten der gesetzlichen Vorschriften zu halten. Die zusätzlichen Investitionskosten für die indirekte Beheizung des Kreislaufs sind aufgrund des bislang unerreichten Gesamtreinigungs-Effektes kurzfristig amortisierbar. Zudem werden diese Kosten durch Einsparungen infolge vergleichsweise kleiner dimensionierter Anlagenteile, wie Trockner, Abscheider, Ventilator, Filtervorrichtung und Kamin nahezu kompensiert. Von besonderem Vorteil ist, daß der Kreislauf, in dem sich die Brüden durch den Trockner bewegen, wegen des vollständigen Ausschlusses von Rauchgasen sehr sauerstoffarm ist, so daß die Gefahr einer Explosion stark vermindert wird. Der geringe Sauerstoffgehalt wiederum ermöglicht eine nah-stöchiometrische Verbrennung, so daß eine hohe Ausnutzung des Brennstoffes erfolgt und damit ein hoher Wirkungsgrad erreichbar ist.With this solution it is possible to keep the emissions of solid, gaseous and / or condensed organic pollutants below the limit values of the legal regulations without the additional cleaning processes that would otherwise be required. The additional investment costs for the indirect heating of the circuit can be amortized at short notice due to the unprecedented overall cleaning effect. In addition, these costs are almost offset by savings due to comparatively small system parts such as dryers, separators, fans, filter devices and chimneys. It is particularly advantageous that the circuit in which the vapors move through the dryer is very low in oxygen due to the complete exclusion of flue gases, so that the risk of an explosion is greatly reduced. The low oxygen content in turn enables near-stoichiometric combustion, so that the fuel is used to a high degree and a high degree of efficiency can be achieved.

In vorteilhafter Ausgestaltung des Verfahrens wird der Brüden-Teilstrom vor der indirekten Beheizung aus dem Kreislauf abgezweigt. Dadurch wird die aufzuheizende Brüdenmenge verringert und gleichzeitig zusätzlich zu den zur Erzeugung der Rauchgase eingesetzten Primärbrennstoffen ein weiterer Energieträger zur Verfügung gestellt.In an advantageous embodiment of the method, the vapor partial flow is branched off from the circuit prior to indirect heating. This reduces the amount of vapor to be heated and at the same time provides an additional energy source in addition to the primary fuels used to generate the flue gases.

Sollte das Einmischen des relativ kühlen Brüden-Teilstroms in die heiße Brennkammer Schwierigkeiten bereiten, kann ein weiterer Brüden-Teilstrom nach der indirekten Aufheizung des Kreislaufs von diesem abgezweigt und in die Brennkammer eingeleitet werden. Da dieser Brüden-Teilstrom aufgeheizt ist, läßt er sich effektiver mit den Rauchgasen vermischen. In diesem Falle wird aufgrund der im Kreislauf einzuhaltenden Massenbilanz der erste Brüden-Teilstrom um das Volumen des zweiten Brüden-Teilstroms verringert.If it is difficult to mix the relatively cool vapor partial flow into the hot combustion chamber, a further vapor partial flow can be obtained after the indirect heating of the Circuit branched from this and introduced into the combustion chamber. Since this vapor partial flow is heated up, it can be mixed more effectively with the flue gases. In this case, the first vapor partial flow is reduced by the volume of the second vapor partial flow due to the mass balance to be maintained in the circuit.

Andere vorteilhafte Merkmale der Erfindung gehen aus den weiteren Unteransprüchen hervor.Other advantageous features of the invention emerge from the further subclaims.

Die Erfindung wird nachstehend an einem Ausführungsbeispiel näher erläutert. Die dazugehörige Zeichnung zeigt ein Prinzip-Schaltbild einer Anlage zur kontinuierlichen Trocknung von Holzspänen, Holzfasern oder dergl.The invention is explained in more detail below using an exemplary embodiment. The accompanying drawing shows a basic circuit diagram of a system for the continuous drying of wood chips, wood fibers or the like.

In dieser Anlage sind ein Trockner 8, ein Abscheider 10, ein Ventilator 11, ein oder mehrere Zyklone 12 und ein rekuperativer Wärmeaustauscher 7 über Rohrleitungen in einem Kreislauf zusammengeschaltet. Durch konstruktive Maßnahmen wird dafür Sorge getragen, daß die Leckage in diesem Kreislauf gering ist.In this system, a dryer 8, a separator 10, a fan 11, one or more cyclones 12 and a recuperative heat exchanger 7 are connected together in a circuit via pipes. Design measures ensure that the leakage in this circuit is low.

Des weiteren weist die Anlage eine Brennkammer 1 mit einem Brenner 2 auf, die rauchgasseitig mit dem Wärmeaustauscher 7 verbunden, aber nicht Bestandteil des Kreislaufs ist. Zum Brenner 2 führen Versorgungsleitungen für Luft 3, Leichtöl oder Gas 4 und Holzstaub 5. Die Brennstoffe können einzeln oder in beliebiger Mischung verbrannt werden.The system also has a combustion chamber 1 with a burner 2, which is connected to the heat exchanger 7 on the flue gas side, but is not part of the circuit. Supply lines for air 3, light oil or gas 4 and wood dust 5 lead to burner 2. The fuels can be burned individually or in any mixture.

Das zu trocknende Gut wird zwischen Wärmeaustauscher 7 und Trockner 8 über eine nicht dargestellte Materialschleuse, beispielsweise eine Zellenradschleuse, und eine Rohrleitung 9 in den Kreislauf eingegeben. Die Zuführung des Gutes kann aber auch direkt in den Eingangsbereich des Trockners 8, der, wie für diesen Einsatzfall üblich, ein Düsenrohrtrockner, Einzug-, Mehrzug-Trommeltrockner oder dergl. sein kann, erfolgen.The material to be dried is entered between the heat exchanger 7 and dryer 8 via a material lock, not shown, for example a rotary valve, and a pipeline 9 into the circuit. The material can also be fed directly into the entrance area of the dryer 8, which, as is customary for this application, can be a nozzle tube dryer, single-pass, multi-pass drum dryer or the like.

Von der zwischen dem bzw. den Zyklonen 12 und dem Trockner 8 für die Rückführung der Brüden zum Trockner 8 angeordneten Rohrleitung 13 zweigt in Strömungsrichtung vor dem Wärmeaustauscher 7 eine Rohrleitung 6 zur Brennkammer 1 ab.From the pipeline 13 arranged between the cyclone or cyclones 12 and the dryer 8 for returning the vapors to the dryer 8, a pipeline 6 branches off in the flow direction upstream of the heat exchanger 7 to the combustion chamber 1.

Die Anlage arbeitet wie folgt:
   Die in der Brennkammer 1 erzeugten Rauchgase werden dem Wärmeaustauscher 7 zugeführt. Dort erfolgt zwischen den heißen Rauchgasen und den im Kreislauf geführten relativ kühlen Brüden ein indirekter Wärmeaustausch, in dessen Ergebnis sich die Brüden auf die für die Trocknung des zu trocknenden Gutes erforderliche Verfahrenstemperatur aufheizen. Nach diesem Wärmeaustauschvorgang wird der heiße Brüdenstrom über das zwischen dem Wärmeaustauscher 7 und dem Trockner 8 angeordnete Teilstück der Rohrleitung 13 dem Trockner 8 zu dessen direkter Beheizung zugeführt. Während des Trocknungsvorganges werden weitere Brüden und schädliche Inhaltsstoffe aus dem zu trocknenden Gut freigesetzt, die zusammen mit dem getrockneten Gut aus dem Trockner 8 abgeführt werden. In dem sich anschließenden Abscheider werden die gröberen Fraktionen des getrockneten Gutes abgetrennt. Die in den Brüden verbleibenden feinen Fraktionen des getrockneten Gutes werden dann zusammen mit den Brüden über ein Gebläse 11 einem oder mehreren Zyklonen 12 zugeführt. Dort erfolgt die Abscheidung der feinen Fraktionen des getrockneten Gutes. Die den bzw. die Zyklone 12 verlassenden Brüden sind mit Feinstäuben und den bei der Trocknung entstandenen Schadstoffen belastet. Sie werden über die Rohrleitung 13 zum Trockner 8 zurückgeführt, wobei sie den Wärmeaustauscher 7 passieren und aufgeheizt werden. Damit ist der annähernd inerte Brüdenkreislauf geschlossen.The system works as follows:
The flue gases generated in the combustion chamber 1 are fed to the heat exchanger 7. There is an indirect heat exchange between the hot flue gases and the relatively cool vapors which are circulated, as a result of which the vapors heat up to the process temperature required for drying the material to be dried. After this heat exchange process, the hot vapor stream is fed to the dryer 8 for direct heating via the section of the pipeline 13 arranged between the heat exchanger 7 and the dryer 8. During the drying process, further vapors and harmful ingredients are released from the material to be dried, which are removed from the dryer 8 together with the dried material. The coarser fractions of the dried material are separated in the subsequent separator. The fine fractions of the dried material remaining in the vapors are then fed together with the vapors via a blower 11 to one or more cyclones 12. This is where the fine fractions of the dried material are separated. The vapors leaving the cyclone or cyclones 12 are contaminated with fine dust and the pollutants formed during drying. They are returned to the dryer 8 via the pipeline 13, where they pass through the heat exchanger 7 and are heated up. This closes the almost inert vapor cycle.

Da im Kreislauf während des Trocknungsvorganges ständig neue, mit Schadstoffen versetzte Brüden entstehen, muß der zirkulierende Brüdenstrom aus Gründen der technologisch im Kreislauf einzuhaltenden Massenbilanz laufend reduziert werden. Das geschieht mittels der Abzweigleitung 6, über die ein Brüden-Teilstrom in die Brennkammer 1 geleitet und dort verbrannt wird. Für den Fall, daß die Einmischung des relativ kühlen Brüden-Teilstromes in die heißen Rauchgase der Brennkammer 1 nicht effektiv ist, kann eine weitere Abzweigleitung 14 in die Brennkammer 1 geführt werden, die hinter dem Wärmeaustauscher 7 vom Kreislauf abgeht. Die darin geführten aufgeheizten Brüden lassen sich einfacher mit den heißen Rauchgasen der Brennkammer 1 mischen. Die Summe der beiden Brüden-Teilströme ist dabei wegen der im Kreislauf einzuhaltenden Massenbilanz immer gleich groß.Since new vapors containing pollutants are constantly formed in the circuit during the drying process, the circulating vapor flow must be continuously reduced for reasons of the mass balance to be observed technologically in the circuit. This is done by means of the branch line 6, via which a vapor partial flow passed into the combustion chamber 1 and burned there. In the event that the mixing of the relatively cool vapor partial flow into the hot flue gases of the combustion chamber 1 is not effective, a further branch line 14 can be led into the combustion chamber 1, which branches off from the circuit behind the heat exchanger 7. The heated vapors contained therein are easier to mix with the hot flue gases from the combustion chamber 1. The sum of the two vapor partial streams is always the same because of the mass balance to be maintained in the circuit.

Die den Wärmeaustauscher 7 verlassenden, gekühlten Rauchgase werden mittels eines Ventilators 15 in eine Filtervorrichtung 16, die als Trockenfilter in Gestalt eines Schlauchfilters oder dergl. ausgebildet ist, gefördert, wo sie gereinigt werden. Wird aschefreier Brennstoff verwendet, kann diese Filtervorrichtung entfallen. Nach der Reinigung werden die Rauchgase in einen Wärmeaustauscher 17 geführt und dort zur Vorwärmung der Verbrennungsluft genutzt. Diese wird über die Rohrleitung 19 dem Brenner 2 zugeführt. Nach dem Wärmeaustauscher 17 werden die Rauchgase über einen Kamin 18 in die Atmosphäre geleitet.The cooled flue gases leaving the heat exchanger 7 are conveyed by means of a fan 15 into a filter device 16, which is designed as a dry filter in the form of a bag filter or the like, where they are cleaned. This filter device can be omitted if ash-free fuel is used. After cleaning, the flue gases are passed into a heat exchanger 17 and used there to preheat the combustion air. This is fed to the burner 2 via the pipeline 19. After the heat exchanger 17, the flue gases are passed into the atmosphere via a chimney 18.

Die Erfindung ist nicht nur auf die Trocknung von Holzspänen, Holzfasern oder dergl. beschränkt, sondern auch für andere Schüttgüter, wie z.B. Fischmehl, Torf, Kohle, Getreide und Klärschlamm, anwendbar.The invention is not only limited to the drying of wood chips, wood fibers or the like, but also for other bulk materials, e.g. Fish meal, peat, coal, grain and sewage sludge, applicable.

Claims (13)

Verfahren zur kontinuierlichen Trocknung von Holzspänen, Holzfasern oder anderen Schüttgütern, bei dem die Wärme von in einer Brennkammer erzeugten Rauchgasen in einem mit dem zu trocknenden Gut beschickten Trockner genutzt wird, dadurch gekennzeichnet, daß die den Trockner verlassenden, rauchgasfreien Brüden in einem Kreislauf zum Trockner zurückgeführt und vor dem Trockner indirekt durch die die Brennkammer verlassenden Rauchgase auf die zur Trocknung des zu trocknenden Gutes erforderliche Temperatur aufgeheizt werden, wobei ein Brüden-Teilstrom aus diesem Kreislauf abgezweigt und zur Brennkammer geführt wird.Process for the continuous drying of wood chips, wood fibers or other bulk materials, in which the heat from flue gases generated in a combustion chamber is used in a dryer charged with the material to be dried, characterized in that the smoke-free vapors leaving the dryer are circulated to the dryer returned and heated up in front of the dryer indirectly through the flue gases leaving the combustion chamber to the temperature required for drying the material to be dried, a partial vapor stream being branched off from this circuit and being fed to the combustion chamber. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Brüden-Teilstrom vor der indirekten Aufheizung des Kreislaufs aus diesem abgezweigt wird.Method according to claim 1, characterized in that the vapor partial flow is branched off from the circuit before the circuit is indirectly heated. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß ein weiterer Brüden-Teilstrom nach der indirekten Beheizung des Kreislaufs aus diesem abgezweigt wird.Method according to claim 2, characterized in that a further partial vapor stream is branched off from the circuit after the indirect heating thereof. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der im Kreislauf geführte Brüdenstrom größer als der bzw. die abgezweigten Brüden-Teilströme ist.Method according to one of the preceding claims, characterized in that the vapor stream circulated is greater than the branch vapor streams branched off. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die gesamte Verbrennung nahstöchiometrisch erfolgt.Method according to one of the preceding claims, characterized in that the entire combustion takes place close to stoichiometry. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß als Primärbrennstoff zur Erzeugung der Rauchgase Öl, vorzugsweise Leichtöl, Gas oder brennbare Stäube, sowohl einzeln als auch in beliebiger Mischung zum Einsatz kommt.Method according to one of the preceding claims, characterized in that oil, preferably light oil, gas or combustible dusts, is used as the primary fuel for generating the flue gases, both individually and in any mixture. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die nach der indirekten Beheizung anfallenden abgekühlten Rauchgase im Trockenfilter-Verfahren gereinigt werden.Method according to one of the preceding claims, characterized in that the cooled flue gases obtained after the indirect heating are cleaned in the dry filter method. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Restwärme der Rauchgase zum Vorwärmen der einem der Brennkammer zugeordneten Brenner zur Erzeugung der Rauchgase zugeführten Verbrennungsluft genutzt wird.Method according to one of the preceding claims, characterized in that the residual heat of the flue gases is used for preheating the burners assigned to a combustion chamber for generating the combustion air supplied to the flue gases. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die im Kreislauf geführten Brüden bei leckluftarmem Trocknungsbetrieb auf zwischen 400°C und 600°C aufgeheizt werden.Method according to one of the preceding claims, characterized in that the vapors which are circulated are heated to between 400 ° C and 600 ° C in drying operation with little air leakage. Anlage zur Durchführung des Verfahrens nach einem oder mehreren der vorhergehenden Ansprüche mit einer Brennkammer zur Erzeugung der Trocknungswärme für einen Trockner, mit einer Zuführvorrichtung für das zu trocknende Gut in den Trockner, mit Fördermitteln zur Abführung des getrockneten Gutes und der Brüden aus dem Trockner und mit einem oder mehreren Zyklonen zum Abscheiden des getrockneten Gutes aus den Brüden, dadurch gekennzeichnet, daß von dem oder den Zyklonen (12) eine Rohrleitung (13) für die Brüden zum Trockner (8) zurückführt, daß in der Rohrleitung (13) ein Wärmeaustauscher (7) für die indirekte Aufheizung der Brüden durch die die Brennkammer (1) verlassenden Rauchgase angeordnet ist und daß von der Rohrleitung (13) in Strömungsrichtung vor dem Wärmeaustauscher (7) eine Abzweigleitung (6) zur Brennkammer (1) vorgesehen ist.System for carrying out the method according to one or more of the preceding claims with a combustion chamber for generating the drying heat for a dryer, with a feed device for the material to be dried into the dryer, with conveying means for removing the dried material and the vapors from the dryer and with one or more cyclones for separating the dried material from the vapors, characterized in that from the cyclone or cyclones (12) a pipe (13) for the vapors leads back to the dryer (8), that in the pipe (13) a heat exchanger ( 7) is arranged for the indirect heating of the vapors through the flue gases leaving the combustion chamber (1) and that a branch line (6) to the combustion chamber (1) is provided by the pipe (13) in the flow direction in front of the heat exchanger (7). Anlage nach Anspruch 11, dadurch gekennzeichnet, daß ein Ventilator (15) zum Abführen der den Wärmeaustauscher (7) verlassenden Rauchgase über eine Filtervorrichtung (16) zum Kamin (18) vorgesehen ist.Installation according to claim 11, characterized in that a fan (15) for removing the flue gases leaving the heat exchanger (7) is provided via a filter device (16) to the chimney (18). Anlage nach Anspruch 11, dadurch gekennzeichnet, daß die Filtervorrichtung (16) als Trockenfilter in Gestalt eines Schlauchfilters oder dergl. ausgebildet ist.Installation according to claim 11, characterized in that the filter device (16) is designed as a dry filter in the form of a bag filter or the like. Anlage nach Anspruch 12, dadurch gekennzeichnet, daß der Filtervorrichtung (16) ein Wärmeaustauscher (17) nachgeschaltet ist, durch den die Restwärme der Rauchgase zur Vorwärmung von Verbrennungsluft genutzt wird, die über eine Rohrleitung (19) in den Brenner (2) gelangt.Installation according to claim 12, characterized in that the filter device (16) is followed by a heat exchanger (17) through which the residual heat of the flue gases is used for preheating combustion air which reaches the burner (2) via a pipe (19).
EP91250134A 1990-06-01 1991-05-15 Process and apparatus for continuous drying of wood chips, wood fibres or other bulk materials Revoked EP0459603B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT91250134T ATE97225T1 (en) 1990-06-01 1991-05-15 PROCESS AND PLANT FOR CONTINUOUS DRYING OF WOOD CHIPS, WOOD FIBERS OR OTHER BULK MATERIALS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4017806A DE4017806A1 (en) 1990-06-01 1990-06-01 METHOD AND SYSTEM FOR THE CONTINUOUS DRYING OF WOODCHIPS, WOOD FIBERS OR OTHER SHEET GOODS
DE4017806 1990-06-01

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EP0459603A1 true EP0459603A1 (en) 1991-12-04
EP0459603B1 EP0459603B1 (en) 1993-11-10

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US (1) US5237757A (en)
EP (1) EP0459603B1 (en)
JP (1) JPH04227464A (en)
AT (1) ATE97225T1 (en)
AU (1) AU7806091A (en)
CA (1) CA2043681A1 (en)
CZ (1) CZ280448B6 (en)
DE (2) DE4017806A1 (en)
ES (1) ES2046848T3 (en)
FI (1) FI912615A (en)
RU (1) RU2023964C1 (en)
ZA (1) ZA914130B (en)

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EP0714006A1 (en) 1994-11-24 1996-05-29 W. Kunz AG Process for drying a substance, in particular wood chips
WO2002040932A1 (en) * 2000-11-14 2002-05-23 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method for conditioning fibrous substances
EP1314943A1 (en) * 2001-11-23 2003-05-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method for conditioning fibrous substances
EP1363097A1 (en) * 2002-05-13 2003-11-19 Robert Dr. Bankwitz Pneumatic centrifugal dryer
EP2078911A1 (en) 2008-01-10 2009-07-15 Kronospan CR, spol. s.r.o. Method for continuous drying of bulk material, in particular of wood fibres and/or wood chippings
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WO2018157947A1 (en) 2017-03-03 2018-09-07 Douglas Technical Limited Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a heat exchanger
WO2018157948A1 (en) * 2017-03-03 2018-09-07 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
WO2018157945A1 (en) * 2017-03-03 2018-09-07 Douglas Technical Limited Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a hot gas cyclone
WO2018157949A1 (en) 2017-03-03 2018-09-07 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
US11384981B2 (en) 2017-06-06 2022-07-12 Kronoplus Limited Apparatus and method for continuously drying bulk goods

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EP0508546A1 (en) * 1991-04-08 1992-10-14 VandenBroek International B.V. Drying apparatus
EP0714006A1 (en) 1994-11-24 1996-05-29 W. Kunz AG Process for drying a substance, in particular wood chips
WO2002040932A1 (en) * 2000-11-14 2002-05-23 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method for conditioning fibrous substances
EP1314943A1 (en) * 2001-11-23 2003-05-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method for conditioning fibrous substances
EP1363097A1 (en) * 2002-05-13 2003-11-19 Robert Dr. Bankwitz Pneumatic centrifugal dryer
WO2009087108A1 (en) * 2008-01-10 2009-07-16 Kronospan Cr, Spol. S.R.O. 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
EP2388542A2 (en) 2008-01-10 2011-11-23 Douglas Technical Limited Method for continuous drying of bulk material, in particular of wood fibres and/or wood chippings
EP2388542A3 (en) * 2008-01-10 2011-12-28 Douglas Technical Limited Method for continuous drying of bulk material, in particular of wood fibres and/or wood chippings
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
RU2467270C2 (en) * 2008-01-10 2012-11-20 Дуглас Текникал Лимитед Method of continuous drying of loose material, and namely of wood fibres and/or wood chips
EP2078911A1 (en) 2008-01-10 2009-07-15 Kronospan CR, spol. s.r.o. Method for continuous drying of bulk material, in particular of wood fibres and/or wood chippings
WO2010102736A1 (en) * 2009-03-10 2010-09-16 Kronotec Ag Wood chip drying system for drying wood chip and associated method for drying wood chip
EP2230477A1 (en) * 2009-03-10 2010-09-22 Kronotec AG Wood chips drying plant for drying wood chips and method for drying wood chips
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 (en) * 2009-03-25 2016-01-20 Saxlund Internat Holding Ab System and method for drying
RU2467269C1 (en) * 2011-05-20 2012-11-20 Федеральное государственное образовательное учреждение высшего профессионального образования "Красноярский государственный аграрный университет" Independent drying unit of high-moisture plant raw material
EA038915B1 (en) * 2017-03-03 2021-11-09 Дуглас Текникал Лимитед Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a heat exchanger
WO2018157949A1 (en) 2017-03-03 2018-09-07 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
WO2018157947A1 (en) 2017-03-03 2018-09-07 Douglas Technical Limited Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a heat exchanger
WO2018157945A1 (en) * 2017-03-03 2018-09-07 Douglas Technical Limited Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a hot gas cyclone
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WO2018157948A1 (en) * 2017-03-03 2018-09-07 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
EA039553B1 (en) * 2017-03-03 2022-02-09 Дуглас Текникал Лимитед Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers, using 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
EA039823B1 (en) * 2017-03-03 2022-03-17 Дуглас Текникал Лимитед Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers, comprising a solid fired hot gas generator
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
CZ280448B6 (en) 1996-01-17
AU7806091A (en) 1991-12-05
DE59100574D1 (en) 1993-12-16
FI912615A0 (en) 1991-05-31
ATE97225T1 (en) 1993-11-15
RU2023964C1 (en) 1994-11-30
EP0459603B1 (en) 1993-11-10
US5237757A (en) 1993-08-24
FI912615A (en) 1991-12-02
CA2043681A1 (en) 1991-12-02
CS163591A3 (en) 1992-02-19
JPH04227464A (en) 1992-08-17
ZA914130B (en) 1992-03-25
ES2046848T3 (en) 1994-02-01
DE4017806A1 (en) 1991-12-05

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