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EP1672302A1 - Process and apparatus for drying. - Google Patents

Process and apparatus for drying. Download PDF

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Publication number
EP1672302A1
EP1672302A1 EP04030046A EP04030046A EP1672302A1 EP 1672302 A1 EP1672302 A1 EP 1672302A1 EP 04030046 A EP04030046 A EP 04030046A EP 04030046 A EP04030046 A EP 04030046A EP 1672302 A1 EP1672302 A1 EP 1672302A1
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EP
European Patent Office
Prior art keywords
drying
gas
container
fresh gas
dried
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Granted
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EP04030046A
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German (de)
French (fr)
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EP1672302B1 (en
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Fasti-Koch GmbH
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FASTI GmbH
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Publication of EP1672302A1 publication Critical patent/EP1672302A1/en
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Publication of EP1672302B1 publication Critical patent/EP1672302B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
    • F26B9/063—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers for drying granular material in bulk, e.g. grain bins or silos with false floor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
    • F26B17/14—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas
    • F26B17/1408—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas the gas being supplied and optionally extracted through ducts extending into the moving stack of material
    • F26B17/1425—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas the gas being supplied and optionally extracted through ducts extending into the moving stack of material the ducts being perforated and arranged vertically
    • 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
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/10—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in the open air; in pans or tables in rooms; Drying stacks of loose material on floors which may be covered, e.g. by a roof
    • F26B9/103—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in the open air; in pans or tables in rooms; Drying stacks of loose material on floors which may be covered, e.g. by a roof using fixed or removable drying air channels placed in the stack, e.g. horizontally or vertically

Definitions

  • the invention relates to a method for drying powdery, granular or pourable materials. Furthermore, the invention relates to a device for drying powdery, granular or bulk materials according to the preamble of claim 7, which comprises a drying container for receiving a substance to be dried, in which an introduction device for introducing a dry gas is arranged and a return means for returning at least a portion of the drying gas is provided as a secondary stream in the drying tank.
  • Such methods are particularly useful for removing moisture from hygroscopic plastic granules, so that during their subsequent processing in the extruder no problems due to water vapor occur, such as voids in the material, surface defects, including loss of mechanical properties.
  • EP 0 634 967 B1 describes a method for operating a dryer for powdery, granular and pourable materials and a dryer operating according to the method.
  • dry compressed air is introduced at a bottom of a granular container as a primary stream, which flows through the drying material and this through a top of the container leaving the opening again.
  • the discharged air can be recycled as secondary flow through a fan back into the bottom region of the container.
  • the granules are fed to the top of the container and leaves it at the bottom through a funnel opening.
  • the invention has for its object to provide a method and an apparatus with which moisture from substances to be dried can be removed particularly efficiently.
  • a supply device for supplying a fresh gas is provided, which is introduced and recyclable together with at least a portion of the drying gas in the drying vessel.
  • a basic idea of the invention is to introduce a fresh gas into the drying container in addition to the recycled dry gas. As a result, the quality of the recirculated dry gas and thus the drying can be improved.
  • the partially saturated and statically charged drying gas after the primary stream is partially enriched by fresh gas and replaced. In particular, can be reduced by the introduction of a low-moisture fresh gas, the moisture content of the dry gas, which has already taken part of the moisture of the substance to be dried.
  • the secondary stream is treated with the fresh gas to be mixed before being introduced into the substance to be dried, in particular filtered and / or heated.
  • the secondary stream is treated with the fresh gas to be mixed before being introduced into the substance to be dried, in particular filtered and / or heated.
  • the drying gas mixes with the derived fresh gas in a particularly desired manner.
  • a particularly preferred variant of the method according to the invention for drying is when the moisture content of the fresh gas is lower than that of the secondary stream. Mixing the moisture-laden drying gas with the fresh gas results overall in a lower moisture content.
  • the dry gas itself, an inert gas, in particular CO 2 or ambient air is preferably used.
  • an inert gas in particular CO 2 or ambient air is preferably used.
  • the supply can be made by special lines or valves or through simple openings on containers or blowers.
  • a supply of the fresh gas and / or a discharge of the secondary flow from the drying container is controlled.
  • the control can be done that a predetermined volume flow of the moisture-enriched drying gas is discharged from the drying container and mixed in a predetermined ratio via a control valve with fresh gas.
  • the supply device for the fresh gas is arranged in an upper region of the drying container and / or along the return device.
  • the fresh gas can be sucked from the blower and mixed with the intended for recycling dry gas.
  • the return means comprises a filter, a fan and / or a heater. Precisely this order is advantageous, so that the fan is not damaged by impurities or excessive humidity and thus the mixture of fresh gas and dry gas is heated together.
  • a further preferred variant of the device according to the invention for drying consists in that the introduction device for the drying gas and / or the return device for the secondary flow has a conical nozzle head.
  • the nozzle head can be a pointed cone, a truncated cone or a double cone.
  • the drying gas can be distributed uniformly over the cross section of the drying container.
  • the outlet openings are preferably arranged on a downwardly directed cone.
  • the nozzle of the continuous primary flow is arranged centrally below the nozzle of the secondary flow in circulation in the drying container. Since the substance to be dried is introduced at the top of the drying container and is taken down in the drying tank, can be done by the secondary flow predrying of the substance to be dried.
  • Fig. 1 is a schematic side view of a device 30 according to the invention for drying a substance to be dried 4, in particular a powdered, granular or pourable material, is shown.
  • This substance 4 to be dried is introduced via the filling device 1 into the drying container 8 and can be removed in the funnel-shaped bottom by pushing away a material discharge slide 9.
  • the drying container 8 is arranged elevated on a frame 10 standing on the ground.
  • a line with compressed air is connected to the compressed air connection 22, so that when the pressure switch 21 is open via the pressure regulator 20 and the throttle valve 19 compressed air at a certain pressure and a certain volume in the introduction device 18, which corresponds to the primary flow line 18 flows.
  • the thus relaxed compressed air, the dew point is lowered, is additionally heated by a heater 17.
  • This relaxed and heated compressed air flows as dry gas 24 via the double cone-shaped nozzle head 7 located at the end of the primary flow line 18 centrally down from the drying tank 8.
  • This drying gas 24 rises as a primary flow through the material to be dried 4 upwards, which is dehumidified and preheated.
  • the temperature and / or the humidity of the dry gas 24 ascending in the drying container 8 can be determined.
  • a portion of the moisture-saturated drying gas 24 is discharged via a gas outlet filter 2 controlled in the environment.
  • the other defined part of the moisture-laden drying gas 24 flows via a dry gas recirculation device 26 and mixes with a fresh gas 25 flowing in via the fresh gas supply device 11.
  • Both gases 24, 25 are passed through the blower 14 via a filter 12 and via the secondary flow line Sucked 13 and mixed in the fan 14.
  • the mixture is heated by a located on the secondary flow line 13 heater 16, 15 pressure, temperature and / or humidity is measured by another measuring device.
  • this dry gas mixture is passed via a double-cone-shaped nozzle head 6 in the middle, above the nozzle 7 of the primary flow line 18 as secondary flow back into the drying tank 8. This dry gas mixture rises through the material to be dried 4 upwards, deprives him of additional moisture and leads to heat.
  • the controllable valve for the fresh gas supply, the blower and / or the heater 16 can be controlled via a control unit, so that the secondary current has a desired, constant state.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The method involves disposing materials (4) into a funnel shaped dehydrating container. Drying gas is discharged into a bottom area of the container. The gas is passed via the material to be dried and dehumidified. The dry gas is partially absorbed and again supplied as secondary flow to the container. The gas is supplied towards passage through the material to be dried, before refeeding secondary flow as fresh gas into the container. An independent claim is also included for a device for drying of power form, granulate form or free flowing materials.

Description

Gegenstand der Erfindung ist ein Verfahren zum Trocknen von pulverförmigen, granulatförmigen oder schüttfähigen Stoffen. Des Weiteren betrifft die Erfindung eine Vorrichtung zum Trocknen von pulverförmigen, granulatförmigen oder schüttförmigen Stoffen gemäß dem Oberbegriff des Anspruchs 7, welche zur Aufnahme eines zu trocknenden Stoffes einen Trocknungsbehälter umfasst, in dem eine Einleitungseinrichtung zum Einleiten eines Trockengases angeordnet ist und eine Rückführungseinrichtung zum Rückführen zumindest eines Teils des Trockengases als Sekundärstrom in den Trocknungsbehälter vorgesehen ist.The invention relates to a method for drying powdery, granular or pourable materials. Furthermore, the invention relates to a device for drying powdery, granular or bulk materials according to the preamble of claim 7, which comprises a drying container for receiving a substance to be dried, in which an introduction device for introducing a dry gas is arranged and a return means for returning at least a portion of the drying gas is provided as a secondary stream in the drying tank.

Derartige Verfahren dienen insbesondere zum Feuchtigkeitsentzug bei hygroskopischen Kunststoffgranulaten, damit während ihrer anschließenden Verarbeitung im Extruder keine Probleme aufgrund von Wasserdampf auftreten, wie Hohlräume im Material, Oberflächendefekte, einschließlich Verlust von mechanischen Eigenschaften.Such methods are particularly useful for removing moisture from hygroscopic plastic granules, so that during their subsequent processing in the extruder no problems due to water vapor occur, such as voids in the material, surface defects, including loss of mechanical properties.

In der EP 0 634 967 B1 wird ein Verfahren zum Betrieb eines Trockners für pulver-, granulatförmige und schüttfähige Stoffe und ein nach dem Verfahren arbeitender Trockner beschrieben. Dabei wird in einem Durchlaufverfahren gereinigte, trockene Druckluft an einer Unterseite eines Granulatbehälters als Primärstrom eingeleitet, welcher das Trocknungsgut durchströmt und diesen durch eine oben am Behälter angeordnete Öffnung wieder verlässt. Über eine entsprechende Leitung aus dem Behälter kann die abgeführte Luft als Sekundärstrom durch ein Gebläse wieder in den Bodenbereich des Behälters zurückgeführt werden. Das Granulat wird oben am Behälter zugeführt und verlässt diesen unten durch eine Trichteröffnung.EP 0 634 967 B1 describes a method for operating a dryer for powdery, granular and pourable materials and a dryer operating according to the method. Here, in a continuous process purified, dry compressed air is introduced at a bottom of a granular container as a primary stream, which flows through the drying material and this through a top of the container leaving the opening again. Via a corresponding line from the container, the discharged air can be recycled as secondary flow through a fan back into the bottom region of the container. The granules are fed to the top of the container and leaves it at the bottom through a funnel opening.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung anzugeben, mit welchen Feuchtigkeit aus zu trocknenden Stoffen besonders effizient entzogen werden kann.The invention has for its object to provide a method and an apparatus with which moisture from substances to be dried can be removed particularly efficiently.

Diese Aufgabe wird durch ein Verfahren mit den Merkmalen des Anspruchs 1 und mit einer Vorrichtung mit den Merkmalen des Anspruchs 7 gelöst. Bevorzugte Ausführungsformen sind in den abhängigen Ansprüchen angegeben.This object is achieved by a method having the features of claim 1 and by a device having the features of claim 7. Preferred embodiments are given in the dependent claims.

Bei einer Vorrichtung zum Trocknen von pulverförmigen, granulatförmigen oder schüttfähigen Stoffen ist erfindungsgemäß, dass eine Zuführungseinrichtung zum Zuführen eines Frischgases vorgesehen ist, welches zusammen mit zumindest einem Teil des Trockengases in den Trocknungsbehälter einleitbar und rückführbar ist.In a device for drying powdery, granular or pourable materials is according to the invention that a supply device for supplying a fresh gas is provided, which is introduced and recyclable together with at least a portion of the drying gas in the drying vessel.

Ein Grundgedanke der Erfindung besteht darin, zusätzlich zu dem rückgeführten Trockengas ein Frischgas in den Trocknungsbehälter einzuleiten. Hierdurch kann die Qualität des rückgeführten Trockengases und damit das Trocknen verbessert werden. Das teilweise gesättigte und statisch aufgeladene Trockengas nach dem Primärstrom wird zum Teil durch Frischgas angereichert und ersetzt. Insbesondere kann durch die Einleitung eines feuchtigkeitsarmen Frischgases der Feuchtigkeitsgehalt des Trockengases, das schon einen Teil der Feuchtigkeit des zu trocknenden Stoffes aufgenommen hat, herabgesetzt werden.A basic idea of the invention is to introduce a fresh gas into the drying container in addition to the recycled dry gas. As a result, the quality of the recirculated dry gas and thus the drying can be improved. The partially saturated and statically charged drying gas after the primary stream is partially enriched by fresh gas and replaced. In particular, can be reduced by the introduction of a low-moisture fresh gas, the moisture content of the dry gas, which has already taken part of the moisture of the substance to be dried.

Beim erfindungsgemäßen Verfahren zum Trocknen ist besonders bevorzugt, wenn der Sekundärstrom mit dem zugemischten Frischgas vor dem Einleiten in den zu trocknenden Stoff aufbereitet, insbesondere gefiltert und/oder aufgeheizt wird. Durch Filtern des Sekundärstromes mit dem zugemischten Frischgas kann dem Gasgemisch Feuchtigkeit und Verunreinigungen entzogen werden. Durch anschließendes Erhitzen kann das gereinigte Gasgemisch wieder mehr Feuchtigkeit aufnehmen.In the method according to the invention for drying is particularly preferred when the secondary stream is treated with the fresh gas to be mixed before being introduced into the substance to be dried, in particular filtered and / or heated. By filtering the secondary stream with the added fresh gas, moisture and impurities can be removed from the gas mixture. By subsequent heating, the purified gas mixture can absorb more moisture again.

Weiter ist bei dem erfindungsgemäßen Verfahren als bevorzugt anzusehen, wenn das Frischgas in Strömungsrichtung vor einem Gebläse in den Sekundärstrom eingeleitet wird. Im Gebläse vermischt sich das Trocknungsgas mit dem abgeleiteten Frischgas in besonders gewünschter Weise.Next is to be regarded in the inventive method as preferred when the fresh gas is introduced in the flow direction in front of a fan in the secondary stream. In the blower, the drying gas mixes with the derived fresh gas in a particularly desired manner.

Eine besonders bevorzugte Variante des erfindungsgemäßen Verfahrens zum Trocknen ist es, wenn der Feuchtigkeitsgehalt des Frischgases geringer ist als der des Sekundärstromes. Durch Mischen des mit Feuchtigkeit beladenen Trockengases mit dem Frischgas ergibt sich insgesamt ein geringerer Feuchtigkeitsgehalt.A particularly preferred variant of the method according to the invention for drying is when the moisture content of the fresh gas is lower than that of the secondary stream. Mixing the moisture-laden drying gas with the fresh gas results overall in a lower moisture content.

Bei der Wahl des Frischgases nach dem erfindungsgemäßen Verfahren zum Trocknen wird bevorzugt das Trockengas selbst, ein Inertgas, insbesondere CO2 oder Umgebungsluft verwendet. Hierdurch können speziell gewünschte Eigenschaften des Sekundärstromes eingestellt werden. Die Zuführung kann durch spezielle Leitungen oder Ventile erfolgen oder durch einfache Öffnungen an Behälter oder Gebläse.In the selection of the fresh gas according to the inventive method for drying, the dry gas itself, an inert gas, in particular CO 2 or ambient air is preferably used. As a result, specifically desired properties of the secondary flow can be set. The supply can be made by special lines or valves or through simple openings on containers or blowers.

Als bevorzugte Variante nach dem erfindungsgemäßen Verfahren zum Trocknen gilt, dass eine Zuführung des Frischgases und/oder eine Ableitung des Sekundärstromes aus dem Trocknungsbehälter gesteuert erfolgt. Die Steuerung kann so erfolgen, dass ein vorgegebener Volumenstrom des mit Feuchtigkeit angereicherten Trockengases aus dem Trocknungsbehälter abgeleitet und in einen vorgegebenen Verhältnis über ein Steuerventil mit Frischgas vermengt wird.As a preferred variant according to the method according to the invention for drying, a supply of the fresh gas and / or a discharge of the secondary flow from the drying container is controlled. The control can be done that a predetermined volume flow of the moisture-enriched drying gas is discharged from the drying container and mixed in a predetermined ratio via a control valve with fresh gas.

Bei der erfindungsgemäßen Vorrichtung zum Trocknen ist bevorzugt, dass die Zuführungseinrichtung für das Frischgas in einem oberen Bereich des Trocknungsbehälters und/oder entlang der Rückführungseinrichtung angeordnet ist. Damit kann das Frischgas vom Gebläse angesaugt und mit dem zur Rückführung vorgesehenen Trockengas vermischt werden.In the device according to the invention for drying, it is preferred that the supply device for the fresh gas is arranged in an upper region of the drying container and / or along the return device. Thus, the fresh gas can be sucked from the blower and mixed with the intended for recycling dry gas.

Bei der erfindungsgemäßen Vorrichtung zum Trocknen ist außerdem vorteilhaft, wenn die Rückführungseinrichtung ein Filter, ein Gebläse und/oder eine Heizeinrichtung aufweist. Gerade diese Reihenfolge ist vorteilhaft, damit das Gebläse nicht durch Verunreinigungen oder zu hohe Luftfeuchtigkeit Schaden nimmt und damit das Gemisch aus Frischgas und Trokkengas gemeinsam erwärmt wird.In the device according to the invention for drying is also advantageous if the return means comprises a filter, a fan and / or a heater. Precisely this order is advantageous, so that the fan is not damaged by impurities or excessive humidity and thus the mixture of fresh gas and dry gas is heated together.

Eine weitere bevorzugte Variante der erfindungsmäßigen Vorrichtung zum Trocknen besteht darin, dass die Einleitungseinrichtung für das Trockengas und/oder die Rückführeinrichtung für den Sekundärstrom einen kegelförmigen Düsenkopf aufweist. Der Düsenkopf kann dabei ein spitzer Kegel, ein Kegelstumpf oder doppelkonusförmig ausgebildet sein. Dadurch kann das Trockengas gleichmäßig über den Querschnitt des Trocknungsbehälters verteilt werden. Die Austrittsöffnungen sind vorzugsweise an einem nach unten gerichteten Konus angeordnet.A further preferred variant of the device according to the invention for drying consists in that the introduction device for the drying gas and / or the return device for the secondary flow has a conical nozzle head. The nozzle head can be a pointed cone, a truncated cone or a double cone. As a result, the drying gas can be distributed uniformly over the cross section of the drying container. The outlet openings are preferably arranged on a downwardly directed cone.

Anzumerken sei, dass es bei der erfindungsgemäßen Vorrichtung bevorzugt ist, dass die Düse des durchlaufenden Primärstromes mittig unterhalb der Düse des im Kreis laufenden Sekundärstromes im Trocknungsbehälter angeordnet ist. Da der zu trocknende Stoff oben im Trocknungsbehälter eingeführt und unten im Trocknungsbehälter entnommen wird, kann durch den Sekundärstrom eine Vortrocknung des zu trocknenden Stoffes erfolgen.It should be noted that it is preferred in the device according to the invention that the nozzle of the continuous primary flow is arranged centrally below the nozzle of the secondary flow in circulation in the drying container. Since the substance to be dried is introduced at the top of the drying container and is taken down in the drying tank, can be done by the secondary flow predrying of the substance to be dried.

Die Erfindung wird anhand von einer bevorzugten Ausführungsvariante, welche schematisch in der Zeichnung dargestellt ist, weiter erläutert.

Fig. 1
zeigt eine schematische Seitenansicht der erfindungsgemäßen Vorrichtung zum Trocknen auf.
The invention will be further explained with reference to a preferred embodiment, which is shown schematically in the drawing.
Fig. 1
shows a schematic side view of the device according to the invention for drying.

In Fig. 1 ist schematisch die Seitenansicht einer erfindungsgemäßen Vorrichtung 30 zum Trocknen eines zu trocknenden Stoffes 4, insbesondere eines pulver-, granulatförmigen oder schüttfähigen Stoffes, dargestellt. Dieser zu trocknende Stoff 4 wird über die Befüllungsvorrichtung 1 in den Trocknungsbehälter 8 eingeführt und kann im trichterförmigen Boden durch Wegschieben eines Materialablassschiebers 9 entnommen werden. Um unter einer Entnahmevorrichtung 23 einen Extruder (nicht dargestellt) anzuordnen, ist der Trocknungsbehälter 8 an einem auf dem Boden stehenden Gestell 10 erhöht angeordnet.In Fig. 1 is a schematic side view of a device 30 according to the invention for drying a substance to be dried 4, in particular a powdered, granular or pourable material, is shown. This substance 4 to be dried is introduced via the filling device 1 into the drying container 8 and can be removed in the funnel-shaped bottom by pushing away a material discharge slide 9. In order to arrange an extruder (not shown) under a removal device 23, the drying container 8 is arranged elevated on a frame 10 standing on the ground.

Eine Leitung mit Druckluft ist am Druckluftanschluss 22 angeschlossen, so dass bei geöffnetem Druckschalter 21 über den Druckregler 20 und das Drosselventil 19 Druckluft mit einem bestimmten Druck und einem bestimmten Volumen in die Einleitungseinrichtung 18, die der Primärstromleitung 18 entspricht, strömt. Die so entspannte Druckluft, deren Taupunkt so herabgesetzt ist, wird mittels einer Heizung 17 zusätzlich erwärmt. Diese entspannte und erwärmte Druckluft strömt als Trockengas 24 über den am Ende der Primärstromleitung 18 befindlichen doppelkonusförmigen Düsenkopf 7 mittig unten am Trocknungsbehälter 8 aus. Dieses Trockengas 24 steigt als Primärstrom durch den zu trocknenden Stoff 4 nach oben, wobei dieser entfeuchtet und vorgewärmt wird. An der Außenwand des Trocknungsbehälters 8 ist eine Isolation 5 vorgesehen. Durch eine Messeinrichtung 3 kann die Temperatur und/oder die Feuchtigkeit des im Trocknungsbehälter 8 nach oben getiegenen Trockengases 24 ermittelt werden.A line with compressed air is connected to the compressed air connection 22, so that when the pressure switch 21 is open via the pressure regulator 20 and the throttle valve 19 compressed air at a certain pressure and a certain volume in the introduction device 18, which corresponds to the primary flow line 18 flows. The thus relaxed compressed air, the dew point is lowered, is additionally heated by a heater 17. This relaxed and heated compressed air flows as dry gas 24 via the double cone-shaped nozzle head 7 located at the end of the primary flow line 18 centrally down from the drying tank 8. This drying gas 24 rises as a primary flow through the material to be dried 4 upwards, which is dehumidified and preheated. On the outer wall of the drying container 8, an insulation 5 is provided. By means of a measuring device 3, the temperature and / or the humidity of the dry gas 24 ascending in the drying container 8 can be determined.

Ein Teil des mit Feuchtigkeit gesättigten Trockengases 24 wird über einen Gasaustrittsfilter 2 gesteuert in die Umgebung abgegeben. Über eine Trockengas-Rückführeinrichtung 26 strömt der andere definierte Teil des mit Feuchtigkeit beladenen Trockengases 24 und vermischt sich mit einem über die Frischgas-Zuführungseinrichtung 11 einströmenden Frischgas 25. Beide Gase 24, 25 werden durch das Gebläse 14 über einen Filter 12 und über die Sekundärstromleitung 13 angesaugt und im Gebläse 14 vermischt. Anschließend wird das Gemisch durch eine an der Sekundärstromleitung 13 befindliche Heizung 16 erwärmt, wobei über eine weitere Messeinrichtung 15 Druck, Temperatur und/oder Feuchtigkeit gemessen wird. Dann wird dieses Trockengasgemisch über einen doppelkonusförmigen Düsenkopf 6 mittig, oberhalb der Düse 7 der Primärstromleitung 18 als Sekundärstrom zurück in den Trocknungsbehälter 8 geleitet. Dieses Trockengasgemisch steigt durch den zu trocknenden Stoff 4 nach oben auf, entzieht ihm zusätzlich Feuchtigkeit und führt Wärme zu.A portion of the moisture-saturated drying gas 24 is discharged via a gas outlet filter 2 controlled in the environment. The other defined part of the moisture-laden drying gas 24 flows via a dry gas recirculation device 26 and mixes with a fresh gas 25 flowing in via the fresh gas supply device 11. Both gases 24, 25 are passed through the blower 14 via a filter 12 and via the secondary flow line Sucked 13 and mixed in the fan 14. Subsequently, the mixture is heated by a located on the secondary flow line 13 heater 16, 15 pressure, temperature and / or humidity is measured by another measuring device. Then, this dry gas mixture is passed via a double-cone-shaped nozzle head 6 in the middle, above the nozzle 7 of the primary flow line 18 as secondary flow back into the drying tank 8. This dry gas mixture rises through the material to be dried 4 upwards, deprives him of additional moisture and leads to heat.

Anhand der Messwerte der Messeinrichtungen 3, 15 können das steuerbare Ventil für die Frischgaszuführung, das Gebläse und/oder die Heizung 16 über eine Steuereinheit gesteuert werden, so dass der Sekundärstrom einen gewünschten, gleich bleibenden Zustand besitzt.Based on the measured values of the measuring devices 3, 15, the controllable valve for the fresh gas supply, the blower and / or the heater 16 can be controlled via a control unit, so that the secondary current has a desired, constant state.

Claims (10)

Verfahren zum Trocknen von pulverförmigen, granulatförmigen oder schüttfähigen Stoffen (4), welche in einen trichterförmigen Trocknungsbehälter (8) angeordnet werden, in dessen Bodenbereich mindestens ein Trockengas (24) eingeleitet wird, das durch den zu trocknenden Stoff (4) hindurchtritt und diesen entfeuchtet, wobei das Trockengas (24) zumindest teilweise aufgefangen und erneut dem Trocknungsbehälter (8) als Sekundärstrom zugeführt wird, wobei
dem Trockengas (24) nach Durchtritt durch den zu trocknenden Stoff (4) und vor der Rückführung in den Trocknungsbehälter (8) als Sekundärstrom Frischgas (25) zugeführt wird.Process for drying powdery, granular or pourable substances (4), which are arranged in a funnel-shaped drying container (8), in the bottom region of which at least one drying gas (24) is introduced, which passes through the material (4) to be dried and dehumidifies it , wherein the drying gas (24) is at least partially collected and again supplied to the drying vessel (8) as a secondary stream, wherein
the dry gas (24) after passing through the material to be dried (4) and before returning to the drying tank (8) as a secondary flow of fresh gas (25) is supplied. Verfahren zum Trocknen nach Anspruch 1,
dadurch gekennzeichnet,
dass der Sekundärstrom mit dem zugemischten Frischgas (25) vor dem Einleiten in den zu trocknenden Stoff (4) aufbereitet, insbesondere gefiltert und/oder aufgeheizt, wird.Method of drying according to claim 1,
characterized,
that the secondary current with the admixed fresh gas (25) before being introduced into the material to be dried processed (4), in particular filtered and / or heated, will. Verfahren zum Trocknen nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass das Frischgas (25) in Strömungsrichtung vor einem Gebläse (14) in den Sekundärstrom eingeleitet wird.Method of drying according to claim 1 or 2,
characterized,
that the fresh gas (25) is introduced in the flow direction in front of a blower (14) in the secondary flow. Verfahren zum Trocknen nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet ,
dass der Feuchtigkeitsgehalt des Frischgases (25) geringer ist als der des Sekundärstroms.Method for drying according to one of claims 1 to 3,
characterized ,
that the moisture content of the fresh gas (25) is less than that of the secondary current. Verfahren zum Trocknen nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
dass als Frischgas (25) das Trockengas (24), ein Inertgas, insbesondere CO2, oder Umgebungsluft verwendet wird.Method for drying according to one of claims 1 to 4,
characterized,
that as fresh gas (25) the drying gas (24), an inert gas, in particular CO 2, or ambient air is used. Verfahren zum Trocknen nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
dass eine Zuführung des Frischgases (25) und/oder eine Ableitung des Sekundärstromes aus dem Trocknungsbehälter (8) gesteuert erfolgt.Method for drying according to one of claims 1 to 5,
characterized,
that a supply of the fresh gas (25) and / or a derivative of the secondary flow from the drying container (8) is controlled. Vorrichtung zum Trocknen von pulverförmigen, granulatförmigen oder schüttfähigen Stoffen (4), welche zum Aufnehmen eines zu trocknenden Stoffes (4) einen Trocknungsbehälter (8) umfasst, in dem eine Einleitungseinrichtung (18) zum Einleiten eines Trockengases (24) angeordnet ist, und eine Rückführungseinrichtung (26) zum Rückführen zumindest eines Teils des Trockengases (24) als Sekundärstrom in den Trocknungsbehälter (8) vorgesehen ist,
dadurch gekennzeichnet,
dass eine Zuführungseinrichtung (11) zum Zuführen eines Frischgases (25) vorgesehen ist, welches zusammen mit zumindest einem Teil des Trockengases (24) in den Trocknungsbehälter (8) einleitbar ist.Apparatus for drying powdery, granular or pourable materials (4), which for receiving a substance to be dried (4) comprises a drying container (8) in which an introduction device (18) for introducing a drying gas (24) is arranged, and a Return means (26) for returning at least a portion of the drying gas (24) as a secondary flow into the drying container (8) is provided,
characterized,
in that a supply device (11) is provided for supplying a fresh gas (25) which, together with at least part of the drying gas (24), can be introduced into the drying container (8). Vorrichtung zum Trocknen nach Anspruch 7,
dadurch gekennzeichnet,
dass die Zuführungseinrichtung (11) für das Frischgas (25) in einem oberen Bereich des Trocknungsbehälters (8) und/oder entlang der Rückführungseinrichtung (26) angeordnet ist.Device for drying according to claim 7,
characterized,
in that the supply means (11) for the fresh gas (25) is arranged in an upper region of the drying container (8) and / or along the return means (26). Vorrichtung zum Trocknen nach Anspruch 7 oder 8,
dadurch gekennzeichnet,
dass die Rückführungseinrichtung (26) einen Filter (12), ein Gebläse (14) und/oder eine Heizeinrichtung (16) aufweist.Device for drying according to claim 7 or 8,
characterized,
that the return means (26) comprises a filter (12), a fan (14) and / or a heating device (16). Vorrichtung zum Trocknen nach einem der Ansprüche 7 bis 9,
dadurch gekennzeichnet,
dass die Einleitungseinrichtung (18) für das Trockengas (24) und/oder die Rückführungseinrichtung (26) für den Sekundärstrom einen kegelförmigen Düsenkopf (6) aufweist.Device for drying according to one of claims 7 to 9,
characterized,
in that the discharge device (18) for the drying gas (24) and / or the secondary flow return device (26) has a conical nozzle head (6).
EP04030046.9A 2004-12-17 2004-12-17 Process and apparatus for drying. Expired - Lifetime EP1672302B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04030046.9A EP1672302B1 (en) 2004-12-17 2004-12-17 Process and apparatus for drying.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04030046.9A EP1672302B1 (en) 2004-12-17 2004-12-17 Process and apparatus for drying.

Publications (2)

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EP1672302A1 true EP1672302A1 (en) 2006-06-21
EP1672302B1 EP1672302B1 (en) 2017-01-25

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2090856A1 (en) * 2008-02-18 2009-08-19 Moretto S.p.A. hopper structure
EP2399718A1 (en) * 2010-06-28 2011-12-28 Wenz Kunststoff GmbH & Co. KG Method and device for drying plastic granulate
EP3540348A1 (en) * 2018-03-16 2019-09-18 Wenz Kunststoff GmbH & Co. KG Method and device for drying plastic granulate

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FR928217A (en) * 1946-05-17 1947-11-21 System and method for drying or heat treatment
US3618227A (en) * 1970-03-26 1971-11-09 Fmc Corp Particle drying apparatus
DE2455335A1 (en) * 1974-11-22 1976-05-26 Gkn Windsor Gmbh Automatic dryer for plastic granulates - with hot air and suction feed operated by central controller
DE19963092A1 (en) * 1999-12-24 2001-06-28 Reimund Oberschmid Solar-powered dryer for air-permeable friable material such as kindling wood, in which wood is layered in drying cavity
US6321461B1 (en) * 2000-04-07 2001-11-27 Minoru Ogasahara Drying apparatus using high pressure gas
US6370797B1 (en) * 1998-06-11 2002-04-16 Universal Dynamics, Inc. Method and apparatus for drying granular solids with venturi powered gas circulation
US20030154624A1 (en) * 2002-02-19 2003-08-21 Sears Charles F. Drying hopper
DE29825036U1 (en) * 1998-10-20 2004-06-24 Wilhelm, Nikolaus Hot gas dryer for granular material especially polymer chips

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR928217A (en) * 1946-05-17 1947-11-21 System and method for drying or heat treatment
US3618227A (en) * 1970-03-26 1971-11-09 Fmc Corp Particle drying apparatus
DE2455335A1 (en) * 1974-11-22 1976-05-26 Gkn Windsor Gmbh Automatic dryer for plastic granulates - with hot air and suction feed operated by central controller
US6370797B1 (en) * 1998-06-11 2002-04-16 Universal Dynamics, Inc. Method and apparatus for drying granular solids with venturi powered gas circulation
DE29825036U1 (en) * 1998-10-20 2004-06-24 Wilhelm, Nikolaus Hot gas dryer for granular material especially polymer chips
DE19963092A1 (en) * 1999-12-24 2001-06-28 Reimund Oberschmid Solar-powered dryer for air-permeable friable material such as kindling wood, in which wood is layered in drying cavity
US6321461B1 (en) * 2000-04-07 2001-11-27 Minoru Ogasahara Drying apparatus using high pressure gas
US20030154624A1 (en) * 2002-02-19 2003-08-21 Sears Charles F. Drying hopper

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2090856A1 (en) * 2008-02-18 2009-08-19 Moretto S.p.A. hopper structure
US8914990B2 (en) 2008-02-18 2014-12-23 Moretto S.P.A. Hopper structure
EP2399718A1 (en) * 2010-06-28 2011-12-28 Wenz Kunststoff GmbH & Co. KG Method and device for drying plastic granulate
EP3540348A1 (en) * 2018-03-16 2019-09-18 Wenz Kunststoff GmbH & Co. KG Method and device for drying plastic granulate

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