EP0611937A1 - Mixer-dryer - Google Patents

Mixer-dryer Download PDF

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Publication number
EP0611937A1
EP0611937A1 EP93120513A EP93120513A EP0611937A1 EP 0611937 A1 EP0611937 A1 EP 0611937A1 EP 93120513 A EP93120513 A EP 93120513A EP 93120513 A EP93120513 A EP 93120513A EP 0611937 A1 EP0611937 A1 EP 0611937A1
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EP
European Patent Office
Prior art keywords
mixer
housing
dryer according
drying gas
interior
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Granted
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EP93120513A
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German (de)
French (fr)
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EP0611937B1 (en
Inventor
Peter Illing
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Draiswerke GmbH
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Draiswerke GmbH
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    • 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
    • F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
    • F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined
    • 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
    • F26B25/007—Dust filtering; Exhaust dust filters

Definitions

  • the invention relates to a mixer-dryer according to the preamble of claim 1.
  • mixer-dryers that work as contact dryers for continuous drying, i.e. the housing wall and possibly the mixing tools are heated. These mixer-dryers are also not very effective.
  • the invention has for its object to design a mixer-dryer of the generic type so that on the one hand a good mixture and on the other hand a highly effective drying of the material is achieved.
  • the continuously operating mixer-dryer Due to its drive as a push or throw mixer, the continuously operating mixer-dryer generates a loosened material bed through which drying gas, generally heated gas, is blown through over its essentially full length is achieved, whereby a further loosening and thereby an intensive contact between drying gas and material is achieved.
  • the drying gas is also drawn off over almost the entire length of the housing, ie the drying gas is traversed over the full length of the drying gas in cross flow. There is no restriction of the drying gas flow. Since the filters are also arranged essentially over the full length of the housing, on the one hand there is a reliable separation of material which the drying gas stream has carried along, and on the other hand no appreciable pressure drop occurs outside the material bed.
  • the mixer-dryer shown in the drawing has a basically cylindrical housing 1 with a horizontal central longitudinal axis 2.
  • the housing 1 is closed at its end faces with end walls 6, 7.
  • the housing 1 is supported by supports 8, 9 against a floor foundation 10.
  • shaft bearings 11, 12 are attached, in which a shaft 13 of a mixing mechanism 14, which is arranged concentrically to the central longitudinal axis 2, is rotatably mounted.
  • the mixer 14 can be driven in rotation about the axis 2 by means of a motor 15 which is coupled to the shaft 13 via a V-belt drive 16.
  • a material supply nozzle 18 which is attached to the top of the housing 1.
  • a material outlet connection 19 opens from the interior 17 thereof.
  • mixing tools 20 there are numerous mixing tools 20, each consisting essentially of a mixing blade 22 located in the area of the inner wall 21 of the housing 1 and a rod 23 connecting it to the shaft 13.
  • the mixing blades 22 are relatively large and are set in the axial conveying direction 24 and in the direction of rotation 25 of the shaft 13 in such a way that they carry or convey the pourable material 26 fed through the feed nozzle 18 in the direction of rotation 25 and in the conveying direction 24.
  • stripping tools 27, 28 are attached to the shaft 13, by means of which material 26 which may adhere to the end walls 6, 7 is stripped off.
  • the mixing blades 22 completely overlap one another in the direction of the axis 2, so that all the peripheral regions of the inner wall 21 are swept by the mixing blades 22, thereby precluding the formation of dead spaces.
  • the mixer-dryer is a continuously operating push or throw mixer, in which the material 26 is shifted in the mixed material bed by means of the mixing blades 22 or is torn out of it and falls back into the mixed material bed in a parabolic throw path.
  • Such thrust or throwing mixers are driven at 0.5 to 10 times the critical speed.
  • the critical speed is understood to mean the speed of the mixing mechanism 14 at which gravitational acceleration occurs at the radially outer ends of the mixing blades 22.
  • a continuously open outlet opening 29 opening into the material outlet connection 19 is formed at the - in the conveying direction 24 rear end of the interior 17 - that is, directly adjacent to the rear end wall 7 of the housing 1.
  • An overflow weir 30 is formed in the conveying direction 24 immediately before this outlet opening 29, in order to ensure a sufficient dwell time of the material to be mixed by means of a degree of filling corresponding to this.
  • On the shaft 13 two further scraping tools 31, 32 are attached, which sweep over the overflow weir 30 in the form of a plate on both sides and thus also prevent buildup of material to be mixed. Insofar as the mixer has been described so far, it is generally known and widespread in practice.
  • drying gas supply chambers 34, 35 are attached to the outside thereof, which - as can be seen in FIG. 1 - each extend over almost half the length of the housing 1, namely from its end wall 6, which is the material Feed pipe 18 faces up to the material outlet pipe 19.
  • These drying gas supply chambers 34, 35 are connected to the interior 17 of the housing 1 via perforated plates 36, 37.
  • the perforated bottoms 36, 37 are partially cylindrical and are adapted to the inner wall 21 of the housing 1. As can be seen in FIG. 2, they each extend approximately symmetrically to the vertical center-symmetry plane 38 of the housing 1 by 30 °.
  • the compressed gas supply boxes 34, 35 each have a drying gas connection 39, 40 on their side opposite the perforated plates 36 and 37, to which a compressed gas supply line (not shown) can be connected, through which compressed gas can be supplied in accordance with the flow direction arrow 41.
  • a box-shaped structure 43 is attached to the upper side 42 of the housing 1 and extends - in the conveying direction 24 - from the material supply nozzle 18 to the rear end wall 7 of the housing 1.
  • a filter box 44 is placed on this box-shaped structure 43, in which - in the conveying direction 24 one after the other - several cylindrical filters 45 are arranged, which are connected to a drying gas exhaust box 46 placed on the filter box 44.
  • the drying gas outlet box 46 opens into a drying gas outlet 47 through which compressed gas flows out in the outflow direction 48.
  • disagglomeration devices 49 in the form of so-called knife mills can be provided in a known manner, which essentially consist of a motor 50 attached to the outside of the housing 1 and a motor 50 that runs into the interior 17 of the housing 1 and can be driven by the motor 50 at high speed Shaft 51 exist on which knives 52 are attached, by means of which material packages, so-called agglomerates, can be comminuted.
  • the material 26 fed into the interior 17 through the material supply nozzle 18 is moist and is to be dried with simultaneous mixing.
  • the compressed gas supply boxes 34, 35 and the perforated plates 36, 37 optionally heated drying gas which flows through the material bed 26 loosened by means of the mixer 14, namely over its full length from the end wall 6 to the overflow weir 30.
  • the drying gas moistened with the moisture of the material 26 occurs in the approximately full length of the housing 1 extending filter box 44, where the material 26 entrained by the drying gas is separated by the filter 45. Only the drying gas laden with moisture emerges through the filters 45.
  • the perforated trays 36, 37 assigned to them can be of different sizes. Furthermore, the width of a perforated base 36 can change over the length of the housing 1, for example such an perforated base 36, 37 can be trapezoidal.

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

Abstract

A mixer-dryer has a basically cylindrical housing (1) in which a mixing unit (14) is arranged which can be driven in rotation. The housing (1) has at one end a material feed nozzle (18) and, at the other end, a material outlet nozzle (19) and is provided in its bottom region (33) with at least one drying-gas feed chamber (34, 35) which extends over an essential part of the length of the housing (1) and is connected to the interior (17) of the housing (1) via a gas-permeable bottom (36, 37). In the region of its top side, the housing (1) has a gas extractor which is designed as a filter box (44) which extends over an essential part of the length of the housing (1) and in which a plurality of filters (45) are arranged one after the other over the length of the housing (1), which filters are connected to a drying-gas extractor (47). <IMAGE>

Description

Die Erfindung betrifft einen Mischer-Trockner nach dem Oberbegriff des Anspruches 1.The invention relates to a mixer-dryer according to the preamble of claim 1.

Bei einem derartigen aus der EP 0 438 772 A1 bekannten Mischer-Trockner, der kontinuierlich betreibbar ist, sind im Bodenbereich Wandsegmente aus porösem gasdurchlässigem Material vorgesehen, durch die Druckgas zur Erzeugung eines Wirbelbettes einströmt. Dieses Druckgas kann zur Erzeugung eines gleichzeitigen Trocknungseffektes erwärmt sein. Aus der Oberseite des Gehäuses mündet ein Gas-Abzug aus. Dieser bekannte Mischer-Trockner, dessen Hauptfunktion in der Erzeugung eines Wirbelbettes zur guten Durchmischung des Materials besteht, ist für schwierige Trocknungsaufgaben nicht geeignet.In such a mixer-dryer known from EP 0 438 772 A1, which can be operated continuously, wall segments made of porous gas-permeable material are provided in the floor area, through which compressed gas flows in to produce a fluidized bed. This compressed gas can be heated to produce a simultaneous drying effect. A gas vent opens from the top of the housing. This known mixer-dryer, whose main function is to create a fluidized bed for thorough mixing of the material, is not suitable for difficult drying tasks.

Weitertun ist es bekannt, zur kontinuierlichen Trocknung Mischer-Trockner einzusetzen, die als Kontakttrockner arbeiten, d.h. die Gehäusewand und gegebenenfalls die Mischwerkzeuge sind beheizt. Auch diese Mischer-Trockner sind nicht sehr wirksam.Furthermore, it is known to use mixer-dryers that work as contact dryers for continuous drying, i.e. the housing wall and possibly the mixing tools are heated. These mixer-dryers are also not very effective.

Der Erfindung liegt die Aufgabe zugrunde, einen Mischer-Trockner der gattungsgemäßen Art so auszugestalten, daß einerseits eine gute Mischung und andererseits eine hochwirksame Trocknung des Materials erreicht wird.The invention has for its object to design a mixer-dryer of the generic type so that on the one hand a good mixture and on the other hand a highly effective drying of the material is achieved.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale im Kennzeichnungsteil des Anspruches 1 gelöst. Der kontinuierlich arbeitende Mischer-Trockner erzeugt aufgrund seines Antriebs als Schub- oder Wurf-Mischer ein stark aufgelockertes Materialbett, durch das über dessen im wesentlichen volle Länge Trocknungsgas, in der Regel also erwärmtes Gas, hindurchgeblasen wird, wodurch eine weitere Auflockerung und dadurch ein intensiver Kontakt zwischen Trocknungsgas und Material erreicht wird. Das Trocknungsgas wird ebenfalls über fast die volle Länge des Gehäuses abgezogen, d.h. das Materialbett wird über seine volle Länge von dem Trocknungsgas im Querstrom durchsetzt. Es tritt keine Einschnürung des Trocknungsgas-Stromes ein. Da die Filter ebenfalls im wesentlichen über die volle Länge des Gehäuses angeordnet sind, erfolgt einerseits eine zuverlässige Abtrennung von Material, das der Trocknungsgasstrom mitgenommen hat, und andererseits tritt außerhalb des Materialbettes kein nennenswerter Druckabfall ein.This object is achieved by the features in the characterizing part of claim 1. Due to its drive as a push or throw mixer, the continuously operating mixer-dryer generates a loosened material bed through which drying gas, generally heated gas, is blown through over its essentially full length is achieved, whereby a further loosening and thereby an intensive contact between drying gas and material is achieved. The drying gas is also drawn off over almost the entire length of the housing, ie the drying gas is traversed over the full length of the drying gas in cross flow. There is no restriction of the drying gas flow. Since the filters are also arranged essentially over the full length of the housing, on the one hand there is a reliable separation of material which the drying gas stream has carried along, and on the other hand no appreciable pressure drop occurs outside the material bed.

Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispieles anhand der Zeichnung. Es zeigt

Fig. 1
einen Mischer-Trockner im Längsschnitt in schematischer Darstellung und
Fig. 2
einen Querschnitt durch den Mischer-Trockner gemäß der Schnittlinie II-II in Fig. 1.
Further features, details and advantages of the invention will become apparent from the following description of an embodiment with reference to the drawing. It shows
Fig. 1
a mixer-dryer in longitudinal section in a schematic representation and
Fig. 2
a cross section through the mixer-dryer according to section line II-II in Fig. 1st

Der in der Zeichnung dargestellte Mischer-Trockner weist ein im Prinzip zylindrisches Gehäuse 1 mit einer horizontalen Mittel-Längs-Achse 2 auf.The mixer-dryer shown in the drawing has a basically cylindrical housing 1 with a horizontal central longitudinal axis 2.

Das Gehäuse 1 ist an seinen Stirnseiten mit Stirnwänden 6, 7 abgeschlossen. Das Gehäuse 1 ist über Stützen 8, 9 gegenüber einem Boden-Fundament 10 abgestützt. An den Stirnwänden 6, 7 sind Wellenlager 11, 12 angebracht, in denen eine konzentrisch zur Mittel-Längs-Achse 2 angeordnete Welle 13 eines Mischwerks 14 drehbar gelagert ist. Das Mischwerk 14 ist um die Achse 2 drehantreibbar und zwar mittels eines Motors 15, der über einen Keilriementrieb 16 mit der Welle 13 gekoppelt ist.The housing 1 is closed at its end faces with end walls 6, 7. The housing 1 is supported by supports 8, 9 against a floor foundation 10. On the end walls 6, 7, shaft bearings 11, 12 are attached, in which a shaft 13 of a mixing mechanism 14, which is arranged concentrically to the central longitudinal axis 2, is rotatably mounted. The mixer 14 can be driven in rotation about the axis 2 by means of a motor 15 which is coupled to the shaft 13 via a V-belt drive 16.

An einem - in Fig. 1 linken - Ende des Gehäuses 1 mündet in dessen Innenraum 17 ein Material-Zuführstutzen 18, der oben auf dem Gehäuse 1 angebracht ist. Am entgegengesetzten - in Fig. 1 also rechten - Ende des Gehäuses 1 mündet aus dessen Innenraum 17 ein Material-Auslaßstutzen 19.At one - in Fig. 1 left - end of the housing 1 opens into the interior 17 of a material supply nozzle 18 which is attached to the top of the housing 1. At the opposite end of the housing 1, which is the right end in FIG. 1, a material outlet connection 19 opens from the interior 17 thereof.

An der Welle 13 des Mischwerks 14 befinden sich zahlreiche Mischwerkzeuge 20, die jeweils im wesentlichen aus einer im Bereich der Innenwand 21 des Gehäuses 1 befindlichen Mischschaufel 22 und einem diese mit der Welle 13 verbindenden Stange 23 bestehen. Die Mischschaufeln 22 sind relativ groß ausgebildet und in axialer Förderrichtung 24 und in Drehrichtung 25 der Welle 13 derart angestellt, daß sie das durch den Zuführstutzen 18 zugeführte schüttfähige Material 26 in Drehrichtung 25 und in Förderrichtung 24 mitnehmen bzw. fördern. Im Bereich der Stirnwände 6, 7 sind an der Welle 13 Abstreifwerkzeuge 27, 28 angebracht, mittels derer eventuell an den Stirnwänden 6, 7 anhaftendes Material 26 abgestreift wird. Die Mischschaufeln 22 überdecken einander in Richtung der Achse 2 vollständig, so daß sämtliche Umfangsbereiche der Innenwand 21 von den Mischschaufeln 22 überstrichen werden, wodurch die Bildung von Toträumen ausgeschlossen wird.On the shaft 13 of the mixer 14 there are numerous mixing tools 20, each consisting essentially of a mixing blade 22 located in the area of the inner wall 21 of the housing 1 and a rod 23 connecting it to the shaft 13. The mixing blades 22 are relatively large and are set in the axial conveying direction 24 and in the direction of rotation 25 of the shaft 13 in such a way that they carry or convey the pourable material 26 fed through the feed nozzle 18 in the direction of rotation 25 and in the conveying direction 24. In the region of the end walls 6, 7, stripping tools 27, 28 are attached to the shaft 13, by means of which material 26 which may adhere to the end walls 6, 7 is stripped off. The mixing blades 22 completely overlap one another in the direction of the axis 2, so that all the peripheral regions of the inner wall 21 are swept by the mixing blades 22, thereby precluding the formation of dead spaces.

Der Mischer-Trockner ist ein kontinuierlich arbeitender Schub- oder Wurf-Mischer, in dem das Material 26 mittels der Mischschaufeln 22 jeweils im Mischgutbett verschoben oder aber aus diesem herausgerissen wird und in einer parabelförmigen Wurfbahn wieder in das Mischgutbett zurückfällt. Derartige Schub- oder Wurf-Mischer werden mit 0,5- bis 10-facher kritischer Drehzahl angetrieben. Unter der kritischen Drehzahl wird die Drehzahl des Mischwerkes 14 verstanden, bei der an den radial äußeren Enden der Mischschaufeln 22 Erdbeschleunigung auftritt.The mixer-dryer is a continuously operating push or throw mixer, in which the material 26 is shifted in the mixed material bed by means of the mixing blades 22 or is torn out of it and falls back into the mixed material bed in a parabolic throw path. Such thrust or throwing mixers are driven at 0.5 to 10 times the critical speed. The critical speed is understood to mean the speed of the mixing mechanism 14 at which gravitational acceleration occurs at the radially outer ends of the mixing blades 22.

Am - in Förderrichtung 24 hinteren Ende des Innenraumes 17 - also unmittelbar benachbart zur hinteren Stirnwand 7 des Gehäuses 1 ist eine in den Material-Auslaßstutzen 19 mündende, ständig offene Auslaßöffnung 29 ausgebildet. In Förderrichtung 24 unmittelbar vor dieser Auslaßöffnung 29 ist ein Überlaufwehr 30 ausgebildet, um durch einen diesem entsprechenden Füllgrad eine ausreichende Verweilzeit des zu mischenden Materials sicherzustellen. An der Welle 13 sind zwei weitere Abstreifwerkzeuge 31, 32 angebracht, die das in Form einer Platte ausgebildete Überlaufwehr 30 an seinen beiden Seiten überstreichen und so auch Anhaftungen von zu mischendem Material verhindern. Insoweit als der Mischer bis hierher beschrieben ist, ist er allgemein bekannt und in der Praxis verbreitet.At the - in the conveying direction 24 rear end of the interior 17 - that is, directly adjacent to the rear end wall 7 of the housing 1, a continuously open outlet opening 29 opening into the material outlet connection 19 is formed. An overflow weir 30 is formed in the conveying direction 24 immediately before this outlet opening 29, in order to ensure a sufficient dwell time of the material to be mixed by means of a degree of filling corresponding to this. On the shaft 13 two further scraping tools 31, 32 are attached, which sweep over the overflow weir 30 in the form of a plate on both sides and thus also prevent buildup of material to be mixed. Insofar as the mixer has been described so far, it is generally known and widespread in practice.

Im unteren Bodenbereich 33 des Gehäuses 1 sind an dessen Außenseite Trocknungsgas-Zuführkammern 34, 35 angebracht, die - wie Fig. 1 entnehmbar ist - sich jeweils über fast die halbe Länge des Gehäuses 1 erstrecken, und zwar von dessen Stirnwand 6, die dem Material-Zuführstutzen 18 zugewandt ist, bis zum Material-Auslaßstutzen 19. Diese Trocknungsgas-Zuführkammern 34, 35 sind über Lochböden 36, 37 mit dem Innenraum 17 des Gehäuses 1 verbunden. Die Lochböden 36, 37 sind teilzylindrisch ausgebildet und der Innenwand 21 des Gehäuses 1 angepaßt. Wie Fig. 2 entnehmbar ist, erstrecken sie sich etwa symmetrisch zur vertikalen Mittel-Symmetrie-Ebene 38 des Gehäuses 1 um jeweils 30°. Die Druckgas-Zuführkästen 34, 35 weisen auf ihrer den Lochböden 36 bzw. 37 entgegengesetzten Seite jeweils einen Trocknungsgas-Anschluß 39, 40 auf, an den eine nicht dargestellte Druckgas-Zuführleitung anschließbar ist, durch die Druckgas entsprechend dem Strömungsrichtungspfeil 41 zuführbar ist.In the lower bottom region 33 of the housing 1, drying gas supply chambers 34, 35 are attached to the outside thereof, which - as can be seen in FIG. 1 - each extend over almost half the length of the housing 1, namely from its end wall 6, which is the material Feed pipe 18 faces up to the material outlet pipe 19. These drying gas supply chambers 34, 35 are connected to the interior 17 of the housing 1 via perforated plates 36, 37. The perforated bottoms 36, 37 are partially cylindrical and are adapted to the inner wall 21 of the housing 1. As can be seen in FIG. 2, they each extend approximately symmetrically to the vertical center-symmetry plane 38 of the housing 1 by 30 °. The compressed gas supply boxes 34, 35 each have a drying gas connection 39, 40 on their side opposite the perforated plates 36 and 37, to which a compressed gas supply line (not shown) can be connected, through which compressed gas can be supplied in accordance with the flow direction arrow 41.

An der Oberseite 42 des Gehäuses 1 ist ein kastenförmiger Aufbau 43 angebracht, der sich - in Förderrichtung 24 - vom Material-Zuführstutzen 18 bis zur hinteren Stirnwand 7 des Gehäuses 1 erstreckt. Auf diesen kastenförmigen Aufbau 43 ist ein Filterkasten 44 aufgesetzt, in dem - in Förderrichtung 24 hintereinander - mehrere zylindrische Filter 45 angeordnet sind, die an einen auf den Filterkasten 44 aufgesetzten Trocknungsgas-Abzugkasten 46 angeschlossen sind. Der Trocknungsgas-Abzugkasten 46 mündet in einen Trocknungsgas-Abzug 47, durch den Druckgas in Ausströmrichtung 48 abströmt.A box-shaped structure 43 is attached to the upper side 42 of the housing 1 and extends - in the conveying direction 24 - from the material supply nozzle 18 to the rear end wall 7 of the housing 1. A filter box 44 is placed on this box-shaped structure 43, in which - in the conveying direction 24 one after the other - several cylindrical filters 45 are arranged, which are connected to a drying gas exhaust box 46 placed on the filter box 44. The drying gas outlet box 46 opens into a drying gas outlet 47 through which compressed gas flows out in the outflow direction 48.

Wie Fig. 2 entnehmbar ist, können in bekannter Weise Desagglomeriereinrichtungen 49 in Form sogenannter Messermühlen vorgesehen sein, die im wesentlichen aus einem an der Außenseite des Gehäuses 1 angebrachten Motor 50 und einer in den Innenraum 17 des Gehäuses 1 hindurchgeführten, vom Motor 50 hochtourig antreibbaren Welle 51 bestehen, auf der Messer 52 angebracht sind, mittels derer Materialzusammenpackungen, sogenannte Agglomerate, zerkleinert werden können.As can be seen in FIG. 2, disagglomeration devices 49 in the form of so-called knife mills can be provided in a known manner, which essentially consist of a motor 50 attached to the outside of the housing 1 and a motor 50 that runs into the interior 17 of the housing 1 and can be driven by the motor 50 at high speed Shaft 51 exist on which knives 52 are attached, by means of which material packages, so-called agglomerates, can be comminuted.

Das durch den Material-Zuführstutzen 18 in den Innenraum 17 zugeführte Material 26 ist feucht und soll unter gleichzeitigem Mischen getrocknet werden. Hierzu wird über die Druckgas-Zuführkästen 34, 35 und die Lochböden 36, 37 gegebenenfalls erwärmtes Trocknungsgas zugeführt, das das mittels des Mischwerks 14 aufgelockerte Materialbett 26 durchströmt, und zwar über dessen volle Länge von der Stirnwand 6 bis zum Überlaufwehr 30. Das mit der Feuchtigkeit des Materials 26 befeuchtete Trocknungsgas tritt in den sich über annähernd die volle Länge des Gehäuses 1 erstreckenden Filterkasten 44 ein, wo das vom Trocknungsgas mitgenommene Material 26 durch die Filter 45 abgetrennt wird. Durch die Filter 45 tritt nur das mit der Feuchtigkeit beladene Trocknungsgas aus. Der einerseits durch das Mischwerk 14 und andererseits durch den über annähernd die volle Gehäuselänge eintretenden Gasstrom bewirkte Auflockern bzw. Fluidisieren des Materialbettes führt zu einem äußerst intensiven Kontakt von Trocknungsgas und Material 26 und damit zu einem äußerst intensiven Trocknungsvorgang. Gleichzeitig werden eventuell notwendige Mischvorgänge ausgeführt.The material 26 fed into the interior 17 through the material supply nozzle 18 is moist and is to be dried with simultaneous mixing. For this purpose, the compressed gas supply boxes 34, 35 and the perforated plates 36, 37 optionally heated drying gas which flows through the material bed 26 loosened by means of the mixer 14, namely over its full length from the end wall 6 to the overflow weir 30. The drying gas moistened with the moisture of the material 26 occurs in the approximately full length of the housing 1 extending filter box 44, where the material 26 entrained by the drying gas is separated by the filter 45. Only the drying gas laden with moisture emerges through the filters 45. The loosening or fluidization of the material bed, caused on the one hand by the mixer 14 and, on the other hand, by the gas flow that occurs over approximately the full length of the housing, leads to an extremely intensive contact of drying gas and material 26 and thus to an extremely intensive drying process. Any necessary mixing operations are carried out at the same time.

Wenn mehrere Zuführkästen 34, 35 vorgesehen sind, dann können die ihnen zugeordneten Lochböden 36, 37 unterschiedlich groß sein. Weiterhin kann sich die Breite eines Lochbodens 36 über der Länge des Gehäuses 1 ändern, beispielsweise kann ein solcher Lochboden 36, 37 also trapezförmig ausgebildet sein.If several feed boxes 34, 35 are provided, then the perforated trays 36, 37 assigned to them can be of different sizes. Furthermore, the width of a perforated base 36 can change over the length of the housing 1, for example such an perforated base 36, 37 can be trapezoidal.

Claims (8)

Mischer-Trockner mit einem ortsfesten, grundsätzlich zylindrischen Gehäuse (1), in dem ein um seine Mittel-Längs-Achse kontinuierlich drehantreibbares Mischwerk (14) angeordnet ist, das an einem Ende mit einem Material-Zuführstutzen (18) und am in Förderrichtung (24) entgegengesetzten Ende mit einem Material-Auslaßstutzen (19) versehen ist, das in seinem Innenraum (17) ein Bett aus zu trocknendem Material (26) aufnimmt, das in seinem Bodenbereich (33) mit mindestens einer, sich über einen wesentlichen Teil der Länge des Gehäuses (1) erstreckenden Trocknungsgas-Zuführkammer (34, 35) versehen ist, die an einen Trocknungsgas-Anschluß (39, 40) angeschlossen und über einen gasdurchlässigen Boden (Lochboden 36, 37) mit dem Innenraum (17) des Gehäuses (1) verbunden ist, und das im Bereich seiner Oberseite (42) mit einem Gas-Abzug versehen ist, dadurch gekennzeichnet, daß der Gas-Abzug als sich mindestens über einen wesentlichen Teil der Länge des Gehäuses (1) erstreckender und mit dessen Innenraum (17) verbundener Filterkasten (44) ausgebildet ist, in dem über die Länge des Gehäuses (1) hintereinander mehrere Filter (45) angeordnet sind, die an einen Trocknungsgas-Abzug (47) angeschlossen sind.Mixer-dryer with a stationary, basically cylindrical housing (1), in which a mixer (14), which can be driven in rotation about its central longitudinal axis, is arranged, which has one end with a material feed nozzle (18) and the other in the conveying direction ( 24) opposite end is provided with a material outlet nozzle (19) which receives in its interior (17) a bed of material to be dried (26), in its bottom region (33) with at least one, over a substantial part of the Length of the housing (1) extending drying gas supply chamber (34, 35) is provided, which is connected to a drying gas connection (39, 40) and via a gas-permeable bottom (perforated bottom 36, 37) with the interior (17) of the housing ( 1) is connected, and which is provided in the region of its upper side (42) with a gas vent, characterized in that the gas vent extends and extends over at least a substantial part of the length of the housing (1) nd with its interior (17) connected filter box (44) is formed, in which several filters (45) are arranged one behind the other along the length of the housing (1) and are connected to a drying gas vent (47). Mischer-Trockner nach Anspruch 1, dadurch gekennzeichnet, daß die Filter (45) langgestreckt ausgebildet und etwa vertikal und quer zur Mittel-Längs-Achse (2) des Mischwerks (14) angeordnet sind.Mixer-dryer according to claim 1, characterized in that the filters (45) are elongated and are arranged approximately vertically and transversely to the central longitudinal axis (2) of the mixer (14). Mischer-Trockner nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Filterkasten (44) etwa quaderförmig ausgebildet ist.Mixer-dryer according to claim 1 or 2, characterized in that the filter box (44) is approximately cuboid. Mischer-Trockner nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß er als Schub- oder Wurf-Mischer ausgebildet ist.Mixer-dryer according to one of claims 1 to 3, characterized in that it is designed as a push or throw mixer. Mischer-Trockner nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß mehrere Trocknungsgas-Zuführkammern (34, 35) in Förderrichtung (24) hintereinander vorgesehen sind.Mixer-dryer according to one of claims 1 to 4, characterized in that a plurality of drying gas supply chambers (34, 35) are provided one behind the other in the conveying direction (24). Mischer-Trockner nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die mindestens eine Trocknungsgas-Zuführkammer (34, 35) über einen Lochboden (36, 37) mit dem Innenraum (17) des Gehäuses (1) verbunden ist.Mixer-dryer according to one of claims 1 to 5, characterized in that the at least one drying gas supply chamber (34, 35) is connected to the interior (17) of the housing (1) via a perforated base (36, 37). Mischer-Trockner nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß mindestens eine Desagglomeriereinrichtung (49) vorgesehen ist.Mixer-dryer according to one of claims 1 to 6, characterized in that at least one deagglomeration device (49) is provided. Mischer-Trockner nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der mindestens eine Lochboden (36, 37) sich über 40 bis 90° erstreckt.Mixer-dryer according to one of claims 1 to 7, characterized in that the at least one perforated base (36, 37) extends over 40 to 90 °.
EP93120513A 1993-02-15 1993-12-20 Mixer-dryer Expired - Lifetime EP0611937B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9302136U 1993-02-15
DE9302136U DE9302136U1 (en) 1993-02-15 1993-02-15 Mixer-dryer

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EP0611937A1 true EP0611937A1 (en) 1994-08-24
EP0611937B1 EP0611937B1 (en) 1998-10-14

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DE (2) DE9302136U1 (en)
ES (1) ES2123610T3 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002092187A1 (en) * 2001-05-16 2002-11-21 Thermtech As Process and arrangement for separating oil from oil containing materials
EP1406054A1 (en) * 2002-10-04 2004-04-07 Edwin Eisenegger Apparatus for treating bulk material
US7155842B2 (en) * 2002-01-16 2007-01-02 Ralf Oliver Petri Microwave mixer/dryer reactor for industrial use
NO339254B1 (en) * 2013-05-22 2016-11-21 Multivector As Apparatus for swirling and drying at least one fragmented substance
NO339253B1 (en) * 2013-05-22 2016-11-21 Multivector As A method and system for treating at least one substance to a dried, fragmented, swirled final product
US10260803B2 (en) 2013-05-22 2019-04-16 Waister As Method, a system and devices for processing at least one substance in a dried, fragmented, fluidized end product

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
FR2712076B1 (en) * 1993-11-04 1996-01-26 Gwozdz Eugene Dryer for wet products, especially sludge from sewage treatment plants.
DE102004048875A1 (en) 2004-10-07 2006-04-13 Bayer Materialscience Ag Process for the preparation of cyclic ketones

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US1642469A (en) * 1926-07-13 1927-09-13 Compton J Tucker Apparatus for drying hay or other products
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002092187A1 (en) * 2001-05-16 2002-11-21 Thermtech As Process and arrangement for separating oil from oil containing materials
US7396433B2 (en) 2001-05-16 2008-07-08 Thermtech As Process and arrangement for separating oil from oil containing materials
US7155842B2 (en) * 2002-01-16 2007-01-02 Ralf Oliver Petri Microwave mixer/dryer reactor for industrial use
EP1406054A1 (en) * 2002-10-04 2004-04-07 Edwin Eisenegger Apparatus for treating bulk material
NO339254B1 (en) * 2013-05-22 2016-11-21 Multivector As Apparatus for swirling and drying at least one fragmented substance
NO339253B1 (en) * 2013-05-22 2016-11-21 Multivector As A method and system for treating at least one substance to a dried, fragmented, swirled final product
US10260803B2 (en) 2013-05-22 2019-04-16 Waister As Method, a system and devices for processing at least one substance in a dried, fragmented, fluidized end product

Also Published As

Publication number Publication date
ES2123610T3 (en) 1999-01-16
EP0611937B1 (en) 1998-10-14
DE59309062D1 (en) 1998-11-19
DE9302136U1 (en) 1993-04-01

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