EP0059858B1 - Method and apparatus for drying solid particles, in particular of fine grained solid particles - Google Patents

Method and apparatus for drying solid particles, in particular of fine grained solid particles Download PDF

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Publication number
EP0059858B1
EP0059858B1 EP82101162A EP82101162A EP0059858B1 EP 0059858 B1 EP0059858 B1 EP 0059858B1 EP 82101162 A EP82101162 A EP 82101162A EP 82101162 A EP82101162 A EP 82101162A EP 0059858 B1 EP0059858 B1 EP 0059858B1
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EP
European Patent Office
Prior art keywords
solid particles
sieve drum
drum
gas
sieve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82101162A
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German (de)
French (fr)
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EP0059858A1 (en
Inventor
Günther Hultsch
Siegfried Baumgärtner
Harald Bock
Reinhold Dipl.-Ing. Schilp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mannesmann Demag Krauss Maffei GmbH
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Krauss Maffei AG
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Publication of EP0059858A1 publication Critical patent/EP0059858A1/en
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Publication of EP0059858B1 publication Critical patent/EP0059858B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
    • F26B7/007—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00 centrifugal fluidised beds

Definitions

  • the invention relates to a method and an apparatus for drying solid particles, in particular fine-grain solid particles according to DE-A 19 10 003 or DE-A 26 22 565.
  • Such centrifugal fluid bed dryers are thus known with a horizontal and vertical drum axis, whereby in the case of a vertical drum axis, the solid particles to be dried are introduced into the screening drum from above, but only flow radially outwards at their lower end and form a circular fluidized bed moving from bottom to top. The dry solid particles are discharged at the top of the sieve drum.
  • a high centrifugal acceleration requires a correspondingly high pressure of the drying air to form the fluidized bed, so that the fluidized bed cannot be formed in a system designed for certain conditions by increasing the drum speed.
  • the object of the invention is to ensure or improve the conveyance of the solid particles in the centrifugal fluid bed, in particular when the system is started up.
  • Claim 2 specifies a further measure to make the starting process easier, whereby a rapid distribution of the solid particles occurs in the axial direction. A further exploitation of the free fall of the solid particles takes place according to claim 3.
  • a device for carrying out the method steps discussed so far specifies claim 4.
  • the promotion of solid particles is supported by a downward gas flow.
  • the measures according to claims 6 and 7 are expedient.
  • Claims 8 and 9 relate in particular to claim 4 and show how a separating device connects in an advantageous manner to the bottom of the screening drum. Irrespective of this, other separation devices can be used if the mixture to be separated is discharged tangentially from the housing below the sieve drum through a pipe socket.
  • FIG. 1 an upwardly concave distributor plate 3 is located under an inlet tube 1 with a filling funnel 2. This is via supports 4 with the upper, upwardly tapering part 5 of a sieve drum 6 attached.
  • the lower part of the vertically arranged screen drum 6 is designed as a cylindrical screen jacket 7.
  • a hub 8 is fastened, which is seated on a hollow shaft 13 which is mounted in a bearing housing 9 and can be driven by a motor 10 via a belt 11 and a pulley 12.
  • the bearing housing 9 as well as a bracket 14 carrying the entry tube 1 are fastened on a drum housing 15.
  • a drum chamber 18 is divided by horizontal dividing walls 16 and 17 over the longitudinal extension of the screen drum 6, through which the drying gas is supplied via a nozzle 19 which is tangentially brought to the housing 15 (arrow 20).
  • the drying gas enters the rotating sieve drum 6 via bores 21 and 22 and forms a fluidized bed moving from top to bottom with the solid particles introduced from above via the feed tube 1 in the fluidized space 25.
  • a radially inwardly projecting rim 24 is provided, through which the dry material flows.
  • the separation space 23 the dried solid particles are thrown against the wall of the housing 15, slide down there and are preferably discharged via a cell wheel under a discharge nozzle 26.
  • the drying gas is blown out of the housing 15 through a curved exhaust pipe 27.
  • the parts with the reference numerals 1 to 22, and 24 to 26 are formed like the parts of FIG. 1.
  • adjoining the rim ring 24 is a downwardly widening guide surface 28 and also a downwardly tapering guide surface 29, between which there is a cylindrical ring part 30 with ribs 31 projecting radially inwards.
  • Gas pipe 32 has a funnel 33 at the upper end, which is arranged so that the dried solid particles, which fall down on the walls of the guide surfaces 28 and 29 and the ring part 30 and are accelerated by the ribs 31 in the circumferential direction thereof, by the Annular gap 35. between the outer wall of the funnel 33 and the inner wall of the guide surface 29 pass down into the housing space 34, from where they are discharged via the discharge nozzle 26, while the drying gas is blown off through the exhaust pipe.

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

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Trocknen von Feststoffpartikein, insbesondere von feinkörnigen Feststoffpartikeln nach der DE-A 19 10 003 oder der DE-A 26 22 565. Derartige Zentrifugal-Fließbett-Trockner sind somit mit horizontaler und vertikaler Trommelachse bekannt, wobei bei vertikaler Trommelachse die zu trocknenden Feststoffpartikein zwar von oben in die Siebtrommel eingeführt werden, jedoch erst an deren unterem Ende radial nach außen strömen und ein von unten nach oben wanderndes kreisförmiges Fließbett bilden. Die trockenen Feststoffpartikeln werden am oberen Ende der Siebtrommel ausgetragen.The invention relates to a method and an apparatus for drying solid particles, in particular fine-grain solid particles according to DE-A 19 10 003 or DE-A 26 22 565. Such centrifugal fluid bed dryers are thus known with a horizontal and vertical drum axis, whereby in the case of a vertical drum axis, the solid particles to be dried are introduced into the screening drum from above, but only flow radially outwards at their lower end and form a circular fluidized bed moving from bottom to top. The dry solid particles are discharged at the top of the sieve drum.

Bei diesen Trocknern werden unterschiedliche Zentrifugalbeschleunigungen z. B. zwischen 50 und 500 m/s2 vorgesehen. Die Schwierigkeit liegt darin, den Trockner anzufahren. Auf Grund der Erdbeschleunigung von 9,81 m/s2 bildet sich bei waagerechter Trommelachse eine ungleichmäßige Wirbelschicht, was für den Trocknungsprozeß nachteilig ist. Bei vertikaler Trommelachse muß das zu trocknende Produkt nach dem Eintragen in die Siebtrommel entgegen der Erdbeschleunigung nach oben gefördert werden. Da beim Anfahren des Trockners im oberen Teil noch kein Fließbett vorhanden ist, durchströmt das Trock- - nungsgas diesen Teil leichter als den unteren Teil der Siebtrommel. Dadurch wird die Ausbildung des Fließbetts über die gesamte Trommellänge erschwert, und zwar um desto mehr, je geringer die Zentrifugalbeschleünigung ist. Eine hohe Zentrifugalbeschleunigung erfordert zur Ausbildung des Fließbettes einen entsprechend hohen Druck der Trocknungsluft, so daß man das Fließbett nicht in einer für bestimmte Verhältnisse ausgelegten Anlage durch Erhöhung der Trommeldrehzahl bilden kann.In these dryers, different centrifugal accelerations such. B. between 50 and 500 m / s 2 is provided. The difficulty lies in starting the dryer. Due to the gravitational acceleration of 9.81 m / s 2 , a non-uniform fluidized bed forms when the drum axis is horizontal, which is disadvantageous for the drying process. In the case of a vertical drum axis, the product to be dried must be conveyed upwards against the acceleration of gravity after it has been introduced into the sieve drum. Since there is no fluidized bed in the upper part when the dryer starts up, the drying gas - flows through this part more easily than the lower part of the sieve drum. This complicates the formation of the fluidized bed over the entire length of the drum, and the more the lower the centrifugal acceleration. A high centrifugal acceleration requires a correspondingly high pressure of the drying air to form the fluidized bed, so that the fluidized bed cannot be formed in a system designed for certain conditions by increasing the drum speed.

Der Erfindung liegt die Aufgabe zugrunde, die Förderung der Feststoffpartikeln im Zentrifugalfließbett, insbesondere beim Anfahren der Anlage, zu gewährleisten bzw. zu verbessern.The object of the invention is to ensure or improve the conveyance of the solid particles in the centrifugal fluid bed, in particular when the system is started up.

Gelöst wird diese Aufgabe durch die im Anspruch 1 angegebene Maßnahme. Diese bewirkt, daß sich beim Anfahren unter Zuhilfenahme der Erdbeschleunigung eine den ganzen inneren Trommelmantel bedeckende Wirbelschicht ausbildet und daß auch im weiteren Betrieb die Förderung der Feststoffpartikeln durch die Erdbeschleunigung zumindest unterstützt wird.This problem is solved by the measure specified in claim 1. This causes a fluidized bed covering the entire inner drum shell to form when starting off with the aid of gravitational acceleration and that the further promotion of the solid particles is at least supported by gravitational acceleration.

Anspruch 2 gibt eine weitere Maßnahme an, um den Anfahrvorgang leichter zu gestalten, wodurch eine rasche Verteilung der Feststoffpartikeln in Achsrichtung eintritt. Eine weitere Ausnutzung des freien Falles der Feststoffpartikeln erfolgt nach Anspruch 3.Claim 2 specifies a further measure to make the starting process easier, whereby a rapid distribution of the solid particles occurs in the axial direction. A further exploitation of the free fall of the solid particles takes place according to claim 3.

Eine Vorrichtung zur Durchführung der bisher erörterten Verfahrensschritte gibt Anspruch 4 an. Nach Anspruch 5 wird die Förderung der Feststoffpartikeln unterstützt durch eine nach unten gerichtete Gasströmung. Dabei sind die Maßnahmen nach Anspruch 6 und 7 zweckmäßig.A device for carrying out the method steps discussed so far specifies claim 4. According to claim 5, the promotion of solid particles is supported by a downward gas flow. The measures according to claims 6 and 7 are expedient.

Die Ansprüche 8 und 9 beziehen sich insbesondere auf Anspruch 4 zurück und zeigen, wie sich eine Trennvorrichtung in günstiger Weise unten an die Siebtrommel anschließt. Davon unabhängig können andere Trennvorrichtungen benutzt werden, wenn das zu trennende Gemisch unterhalb der Siebtrommel tangential aus dem Gehäuse durch einen Rohrstutzen abgeleitet wird.Claims 8 and 9 relate in particular to claim 4 and show how a separating device connects in an advantageous manner to the bottom of the screening drum. Irrespective of this, other separation devices can be used if the mixture to be separated is discharged tangentially from the housing below the sieve drum through a pipe socket.

Die Erfindung wird anhand zweier in der Zeichnung dargestellter Ausführungsbeispiele erläutert. Die Fig. 1 und 2 stellen senkrechte Längsschnitte dar. Nach Fig. 1 befindet sich unter einem Eintragrohr 1 mit einem Fülltrichter 2 ein nach oben konkav ausgebildeter Verteilteller 3. Dieser ist über Stützen 4 mit dem oberen, nach oben sich verjüngenden Teil 5 einer Siebtrommel 6 befestigt. Der untere Teil der vertikal angeordneten Siebtrommel 6 ist als zylindrischer Siebmantel 7 ausgebildet. Am oberen Teil 5 der Siebtrommel 6 ist eine Nabe 8 befestigt, die auf einer in einem Lagergehäuse 9 gelagerten und von einem Motor 10 über einen Riemen 11 und eine Riemenscheibe 12 antreibbaren Hohlwelle 13 sitzt.The invention is explained with reference to two exemplary embodiments shown in the drawing. 1 and 2 represent vertical longitudinal sections. According to FIG. 1, an upwardly concave distributor plate 3 is located under an inlet tube 1 with a filling funnel 2. This is via supports 4 with the upper, upwardly tapering part 5 of a sieve drum 6 attached. The lower part of the vertically arranged screen drum 6 is designed as a cylindrical screen jacket 7. At the upper part 5 of the screening drum 6, a hub 8 is fastened, which is seated on a hollow shaft 13 which is mounted in a bearing housing 9 and can be driven by a motor 10 via a belt 11 and a pulley 12.

Das Lagergehäuse 9 wie auch eine das Eintragrohr 1 tragende Konsole 14 sind auf einem Trommelgehäuse 15 befestigt. In diesem ist durch waagerechte Trennwände 16 und 17 über die Längserstreckung der Siebtrommel 6 ein Trommelraum 18 abgeteilt, durch den über einen tangential an das Gehäuse 15 herangeführten Stutzen 19 das Trocknungsgas zugeführt wird (Pfeil 20).The bearing housing 9 as well as a bracket 14 carrying the entry tube 1 are fastened on a drum housing 15. In this a drum chamber 18 is divided by horizontal dividing walls 16 and 17 over the longitudinal extension of the screen drum 6, through which the drying gas is supplied via a nozzle 19 which is tangentially brought to the housing 15 (arrow 20).

Das Trocknungsgas tritt über Bohrungen 21 und 22 in die rotierende Siebtrommel 6 ein und bildet mit den von oben über das Eintragrohr 1 eingegebenen Feststoffpartikeln im Wirbelraum 25 ein von oben nach unten wanderndes Fließbett. Am unteren Ende der Siebtrommel 6, an dem sie und die Trennwand 17 eine Abdichtung zwischen dem Trommelraum 18 und einem unter der Siebtrommel 6 sich befindendem Trennraum 23 bildet, ist ein radial nach innen vorstehender Bordring 24 vorgesehen, über den das Trockengut abfließt. Im Trennraum 23 werden die getrockneten Feststoffpartikeln an die Wandung des Gehäuses 15 geschleudert, gleiten an dieser nach unten und werden vorzugsweise über ein Zellenrad unter einem Austragstutzen 26 abgeführt. Das Trocknungsgas wird durch ein gekrümmtes Abgasrohr 27 aus dem Gehäuse 15 abgeblasen.The drying gas enters the rotating sieve drum 6 via bores 21 and 22 and forms a fluidized bed moving from top to bottom with the solid particles introduced from above via the feed tube 1 in the fluidized space 25. At the lower end of the screen drum 6, on which it and the partition 17 form a seal between the drum space 18 and a separation space 23 located below the screen drum 6, a radially inwardly projecting rim 24 is provided, through which the dry material flows. In the separation space 23, the dried solid particles are thrown against the wall of the housing 15, slide down there and are preferably discharged via a cell wheel under a discharge nozzle 26. The drying gas is blown out of the housing 15 through a curved exhaust pipe 27.

Nach Fig. 2 sind die Teile mit den Bezugszeichen 1 bis 22, und 24 bis 26 gleich den Teilen nach Fig. 1 ausgebildet. Jedoch schließt sich an den Bordring 24 eine nach unten sich erweiternde Leitfläche 28 und weiter eine nach unten sich verjüngende Leitfläche 29 an, zwischen denen sich ein zylindrischer Ringteil 30 mit radial nach innen herausragenden Rippen 31 befindet.2, the parts with the reference numerals 1 to 22, and 24 to 26 are formed like the parts of FIG. 1. However, adjoining the rim ring 24 is a downwardly widening guide surface 28 and also a downwardly tapering guide surface 29, between which there is a cylindrical ring part 30 with ribs 31 projecting radially inwards.

Das ähnlich wie nach Fig. 1 vorgesehene Abgasrohr 32 weist am oberen Ende einen Trichter 33 auf, der so angeordnet ist, daß die getrockneten Feststoffpartikeln, die an den Wänden der Leitflächen 28 und 29 und des Ringteils 30 nach unten fallen und durch die Rippen 31 in dessen Umfangsrichtung beschleunigt werden, durch den Ringspalt 35. zwischen der Außenwandung des Trichters 33 und der Innenwandung der Leitfläche 29 hindurch nach unten in den Gehäuseraum 34 gelangen, von wo sie über den Austragstutzen 26 ausgetragen weruen, während das Trocknungsgas durch das Abgasrohr abgeblasen wird.The similar to that provided in FIG. 1 Gas pipe 32 has a funnel 33 at the upper end, which is arranged so that the dried solid particles, which fall down on the walls of the guide surfaces 28 and 29 and the ring part 30 and are accelerated by the ribs 31 in the circumferential direction thereof, by the Annular gap 35. between the outer wall of the funnel 33 and the inner wall of the guide surface 29 pass down into the housing space 34, from where they are discharged via the discharge nozzle 26, while the drying gas is blown off through the exhaust pipe.

Claims (9)

1. A method of drying solid particles, more specially fine grained ones, in a gas functioning as a vehicle and drying current, wherein the said solid particles while in a vessel with an axis of rotation mechanically undergo a centrifugal and rotary motion about said axis and said gas vehicle and drying current makes its way through the said solid particles and through a turning radially symmetrical sieve drum casing generally radially towards said axis at such a speed that the said solid particles are kept in suspension (as a fluidized bed) and are moving at a great speed in relation to the said gas current, characterized in that the solid particles are run in at the top part of the uprightly placed sieve drum (6), make their way downwards with the help of the force of gravity and come out of the sieve drum in the lower part of the drum.
2. The method as claimed in claim 1, characterized in that the speed of turning of the sieve drum (6) is decreased at the start of the operation.
3. The method as claimed in claim 1 or claim 2, characterized in that the downward motion of the dry solid particles as they come out of the sieve drum (6) in the circumferential direction of. the fluidized bed is used for separating the gas from the solid particles.
4. An apparatus for undertaking the method as claimed in any one of claims 1 to 3 with a sieve drum having an upright axis, characterized in that there is an inlet means (1 and 2) for the solid particles in the top part of the sieve drum (6).
5. The apparatus as claimed in claim 4, wherein joined with the cylindrical sieve drum in the top part there is an upwardly conically narrowing part, characterized in that the said conically narrowing part (5) of the sieve drum (6) is as well in the form of a sieve, through which the drying gas is moved in an inward direction.
6. The apparatus as claimed in claim 5, wherein the inlet means has a generally upright inlet pipe, under whose lower end there is a distribution plate for the said solid particles, said distribution plate causing a distribution of the solid particles in an outward, radial direction generally on the level characterized in that the distribution plate (3) is made so as to be concave in an upward direction and in that the solid particles are slung thereoff at a small upward angle.
7. The apparatus as claimed in claim 6, characterized in that the sieve drum (6) has a uniform gas guiding space (housing 15) placed round the cylindrical part (7) and furthermore the conical part sieve part (5) thereof.
8. The apparatus as claimed in any one of claims 4 to 7, characterized in that the lower end of the sieve drum (6) or an edge ring (24) thereof is joined to a guide plane (28 and 29), said guide plane first becoming wider conically and then becoming narrower conically and between the two guide planes there is a cylindrical ring part (30) having inwardly running fins (31).
9. The apparatus as claimed in any one of claims 4 to 8, characterized in that under the sieve drum (6) there is an upwardly opening tube (27 and 32) for letting off the gas and in that under the sieve drum there is a housing (15) with a round cross section, said housing becoming narrower towards a an outlet connector (26) for the dried solid particles.
EP82101162A 1981-03-11 1982-02-17 Method and apparatus for drying solid particles, in particular of fine grained solid particles Expired EP0059858B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3109140 1981-03-11
DE3109140A DE3109140C2 (en) 1981-03-11 1981-03-11 Device for drying particularly fine-grained solid particles

Publications (2)

Publication Number Publication Date
EP0059858A1 EP0059858A1 (en) 1982-09-15
EP0059858B1 true EP0059858B1 (en) 1984-05-02

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EP82101162A Expired EP0059858B1 (en) 1981-03-11 1982-02-17 Method and apparatus for drying solid particles, in particular of fine grained solid particles

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US (1) US4461093A (en)
EP (1) EP0059858B1 (en)
JP (1) JPS57164275A (en)
DE (1) DE3109140C2 (en)
DK (1) DK103682A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3430127A1 (en) * 1984-08-16 1986-02-27 Krauss-Maffei AG, 8000 München DEVICE AND METHOD FOR DRYING PARTICULARLY FINE-GRAINED SOLID PARTICLES
US5352712A (en) * 1989-05-11 1994-10-04 Borden, Inc. Ultraviolet radiation-curable coatings for optical fibers
US5020239A (en) * 1990-06-08 1991-06-04 Wenger Manufacturing, Inc. Air suspension enrober
US5611150A (en) * 1996-05-23 1997-03-18 The Conair Group, Inc. Centrifugal pellet dryer
RU2264589C1 (en) * 2004-04-01 2005-11-20 Институт Катализа Им. Г.К. Борескова Сибирского Отделения Российской Академии Наук Method and device for pulse heat treatment of loose materials
DE102005023258A1 (en) * 2004-11-16 2006-11-23 Fan Separator Gmbh Rotary drum for aerobic heating of free-flowing solids
GB2534159B (en) * 2015-01-14 2017-08-30 Clyde Process Ltd Apparatus for drying conveyed material
CN105043023A (en) * 2015-07-07 2015-11-11 苏州赛弗尔机械有限公司 Simple centrifugal dryer
CN108240762A (en) * 2018-03-06 2018-07-03 嘉兴希卡姆复合材料有限公司 A kind of modified composite material particle drying device
CN111854335A (en) * 2020-07-30 2020-10-30 李国安 Floated powder drying-machine

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
US2254867A (en) * 1937-10-11 1941-09-02 Extractol Process Ltd Process for continuous treatment of exhausted solvent-impregnated solid agglutinative organic material
US3500552A (en) * 1968-03-07 1970-03-17 Us Agriculture Method and apparatus for drying foods
US3600817A (en) * 1969-11-28 1971-08-24 Siemens Ag Processing apparatus for effecting interaction between, and subsequent separation or gaseous and solid or liquid particulate substances
DE2622565C3 (en) * 1976-05-20 1982-11-04 Krauss-Maffei AG, 8000 München Device for drying solid particles in the fluidized bed process

Also Published As

Publication number Publication date
JPS57164275A (en) 1982-10-08
JPH0421113B2 (en) 1992-04-08
US4461093A (en) 1984-07-24
DE3109140A1 (en) 1982-09-23
EP0059858A1 (en) 1982-09-15
DK103682A (en) 1982-09-12
DE3109140C2 (en) 1986-11-06

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