EP0017040B1 - Thin-film contact dryer - Google Patents
Thin-film contact dryer Download PDFInfo
- Publication number
- EP0017040B1 EP0017040B1 EP80101291A EP80101291A EP0017040B1 EP 0017040 B1 EP0017040 B1 EP 0017040B1 EP 80101291 A EP80101291 A EP 80101291A EP 80101291 A EP80101291 A EP 80101291A EP 0017040 B1 EP0017040 B1 EP 0017040B1
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- EP
- European Patent Office
- Prior art keywords
- dryer
- rotor
- film contact
- product
- thin
- 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
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/18—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact
- F26B3/22—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source and the materials or objects to be dried being in relative motion, e.g. of vibration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/12—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in stationary drums or other mainly-closed receptacles with moving stirring devices
- F26B11/16—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in stationary drums or other mainly-closed receptacles with moving stirring devices the stirring device moving in a vertical or steeply-inclined plane
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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
Definitions
- the invention is based on a thin-film contact dryer with a rotor which has sheet-like distribution elements which extend in the radial direction.
- the rotor wi-d repeatedly throws the wet material into the heated inner wall of the dryer until it can finally be removed in a free-flowing, dry form at the other end of the dryer.
- tubers In the case of moist goods which are fed as pumpable paste into a thin-film contact dryer, larger product agglomerates (tubers) very often form, which in pea to hazelnut sizes penetrate the otherwise powdery dry goods. With a given tendency to granulate, tuber formation is also possible with free-flowing moist materials.
- the tubers which are still moist inside, make the dry material unusable because of it. does not meet the requirements for residual moisture, grindability and handling. Sifting and returning the tuber portion is very expensive. Therefore, the horizontal thin-film contact dryer could not be used in cases where small amounts of tubers were already formed.
- bent-back distribution elements have been developed which should prevent the tubers by drawing the product into the conical gap between the distribution elements (circumferential) and the cylindrical heating surface (resting) and spreading it. It was shown, however, that a noticeable, but in no case sufficient reduction in the proportion of tubers in the dry material could be achieved.
- Another proposal is based on increasing the product dwell time by tilting the dryer so that the tubers are destroyed. However, due to the increased amount of product in the dryer there are impermissible mechanical stresses on the high-speed rotor.
- DE-A-2724281 describes a dryer for bulk materials, the rotor of which is equipped with radial blades.
- segment webs are provided which, together with the blades, form pocket-shaped cells for gripping and for further transport of the bulk material.
- the blades with the associated segment webs are offset in the longitudinal direction with respect to the blades located in the adjacent row; d. that is, the individual webs lie in different planes perpendicular to the rotor axis. Because of this arrangement, larger product tubers, particularly in the case of agglomerating products, would be gripped by the cells and transported through the dryer, which leads to the disadvantages described above.
- With the rotor internals described in DE-A-2 724 281 it is only achieved that the heat exchange and thus the dryer performance is improved.
- the invention has for its object to develop a thin-film contact dryer, which in any case delivers a lump-free powdered dry material.
- the width d of the annular gap is advantageously greater than the distance s of the distribution elements from the dryer wall.
- the annular gap does not hinder the conveyance of the already powdery, free-flowing product parts which are distributed over the circumference of the dryer in a thin layer due to the high centrifugal forces.
- the bulbs are held back by the ring weir until they are gripped by the distribution elements and crushed into powder can also pass through the ring gap.
- the particle size of the dry material then corresponds at most to the width of the annular gap.
- the dryer housing 1 is basically set up horizontally. Its main components are the cylindrical housing 1, the rotor 2 with rotor elements 3 and the feed screw 4 at the right end.
- the rotor elements are, in a known manner, conveying, spring and circulating elements.
- the dryer housing 1 is provided with a heating jacket 5. At the ends of the dryer there are end flanges 6 and 7.
- the paste-like material to be dried is metered in through the nozzle 8 in the area of the feed screw 4. Then it is gripped by the rotor blades 3 and flung against the inner wall 9 of the drying room. Due to the centrifugal forces that occur, the product delivery remains limited to a narrow annular zone on the inner wall 9 of the dryer.
- the dried product is removed from the product discharge 10 at the left end of the dryer.
- the vapors formed are sucked off through the nozzle 11.
- the rotor In the middle third of the dryer, the rotor is equipped with a ring weir 13 and the associated distribution elements 12 (see enlarged section according to FIGS. 2 and 3).
- the ring weir 13 follows seen in the direction of flow, i. H. from right to left, directly onto the associated distribution elements 12.
- the shape of the ring weir 13 and the associated distribution elements 12 can be seen from FIG.
- the distribution elements 12 consist of bent-back metal sheets which are fastened centrally to the rotor 2 and end directly in front of the inner wall 9 of the dryer.
- the distance s between the outer edge of the distribution plates 12 and the inner wall 9 is z. B. in the order of 1 mm.
- the immediately following ring weir 13 consists of an annular disc which is fastened in the middle to the rotor 2 by means of webs 14.
- the radius of the annular disk is dimensioned such that a narrow annular gap 15 remains between its outer edge and the inner wall 9 of the dryer.
- Its gap width d must be larger than the gap s between the distribution elements 12 and the dryer wall 9. In practice, it is between 2 and 5 mm. If possible, the ring weir 13 should connect flush to the distribution elements. However, the distance between the weir and the distribution elements must never be greater than the width d of the annular gap 15.
- the moist material 16 which is partially agglomerated into tubers 17, is transported along the inner wall 9 of the dryer due to the centrifugal forces and is thereby dried by the heat supplied by the heating jacket 5.
- the ring weir 13 prevents the bulbs 17 from rolling between the associated distribution elements 12 and not being grasped by them at all.
- the mode of operation of the ring weir 13 thus consists in the tubers 17 being backed up in the area of the associated distribution elements 12.
- the vapors can flow freely through the large semicircular openings 18 in the ring weir 13.
- the same purpose as the ring weir 13 described would therefore also serve a baffle plate with openings (for the passage of the vapors).
- the location of such a unit in the dryer is not very critical. However, it is recommended to install the ring weir in connection with the associated distribution elements at a distance from the product entry 8 which corresponds to at least 1 third and at most 2 thirds of the rotor length L. If the ring weir 13 is arranged too close to the entry 8, the gap 15 can be blocked by a product which has not yet been converted into the powder phase. If it is attached too close to the product discharge 10, on the other hand, it is no longer guaranteed that the shredded tuber components are still sufficiently dried.
Description
Die Erfindung geht aus von einem Dünnschichtkontakttrockner mit einem Rotor, der flächenförmige, sich in radialer Richtung erstrekkende Verteilerelemente aufweist. Durch den Rotor wi-d das eingetragene Feuchtgut immer wieder an die beheizte Innenwand des Trockners geschleudert, bis es schließlich am anderen Ende des Trockners in rieselförmiger und trockener Form entnommen werden kann.The invention is based on a thin-film contact dryer with a rotor which has sheet-like distribution elements which extend in the radial direction. The rotor wi-d repeatedly throws the wet material into the heated inner wall of the dryer until it can finally be removed in a free-flowing, dry form at the other end of the dryer.
Bei Feuchtgütern, die als pumpbare Paste in einen Dünnschichtkontakttrockner eingespeist werden, bilden sich sehr häufig größere Produktagglomerate (Knollen), die in Erbsen- bis Haselnußgröße das sonst pulvrige Trockengut durchsetzen. Bei gegebener Granulationsneigung ist die Knollenbildung auch bei rieselfähigen Feuchtgütern möglich.In the case of moist goods which are fed as pumpable paste into a thin-film contact dryer, larger product agglomerates (tubers) very often form, which in pea to hazelnut sizes penetrate the otherwise powdery dry goods. With a given tendency to granulate, tuber formation is also possible with free-flowing moist materials.
Die im Inneren noch feuchten Knollen machen das Trockengut unbrauchbar, weil es. den Forderungen für Restfeuchte, Mahlbarkeit und Handhabung nicht entspricht. Ein Absieben und Rückführen des Knollenanteils ist sehr aufwendig. Daher konnte der horizontale Dünnschichtkontakttrockner in den Fällen, in denen sich auch schon geringe Mengen an Knollen bildeten, bisher nicht eingesetzt werden.The tubers, which are still moist inside, make the dry material unusable because of it. does not meet the requirements for residual moisture, grindability and handling. Sifting and returning the tuber portion is very expensive. Therefore, the horizontal thin-film contact dryer could not be used in cases where small amounts of tubers were already formed.
Zu diesem Zweck sind zurückgebogene Verteilelemente entwickelt worden, die die Knollen dadurch verhindern sollten, daß das Produkt in den konischen Spalt zwischen Verteilelementen (umlaufend) und der zylindrischen Heizfläche (ruhend) eingezogen und verstrichen wird. Es zeigte sich jedoch, daß damit zwar eine merkliche, aber in keinem Falle ausreichende Verringerung des Knollenanteils im Trockengut erzielt werden konnte.For this purpose, bent-back distribution elements have been developed which should prevent the tubers by drawing the product into the conical gap between the distribution elements (circumferential) and the cylindrical heating surface (resting) and spreading it. It was shown, however, that a noticeable, but in no case sufficient reduction in the proportion of tubers in the dry material could be achieved.
Ein anderer Vorschlag beruht darauf, durch Schrägstellen des Trockners die Produktverweilzeit so weit zu erhöhen, daß die Knollen vernichtet werden. Dabei ergeben sich jedoch infolge der erhöhten Produktmenge im Trockner unzulässige mechanische Beanspruchungen am schnell laufenden Rotor.Another proposal is based on increasing the product dwell time by tilting the dryer so that the tubers are destroyed. However, due to the increased amount of product in the dryer there are impermissible mechanical stresses on the high-speed rotor.
Ferner ist in der DE-A-2724281 ein Trockner für Schüttgüter beschrieben, dessen Rotor mit radialen Schaufeln bestückt ist. Außerdem sind Segmentstege vorgesehen, die zusammen mit den Schaufeln taschenförmige Zellen zum Ergreifen und zum Weitertransport des Schüttgutes bilden. Die Schaufeln mit den dazugehörigen Segmentstegen sind bezüglich der in der benachbarten Reihe befindlichen Schaufeln in Längsrichtung versetzt; d. h., die einzelnen Stege liegen in verschiedenen Ebenen senkrecht zur Rotorachse. Aufgrund dieser Anordnung würden größere Produktknollen insbesondere bei agglomerierenden Produkten von den Zellen ergriffen und durch den Trockner transportiert, was zu den oben beschriebenen Nachteilen führt. Mit den in DE-A-2 724 281 beschriebenen Rotoreinbauten wird lediglich erreicht, daß der Wärmeaustausch und damit die Trocknerleistung verbessert wird.Furthermore, DE-A-2724281 describes a dryer for bulk materials, the rotor of which is equipped with radial blades. In addition, segment webs are provided which, together with the blades, form pocket-shaped cells for gripping and for further transport of the bulk material. The blades with the associated segment webs are offset in the longitudinal direction with respect to the blades located in the adjacent row; d. that is, the individual webs lie in different planes perpendicular to the rotor axis. Because of this arrangement, larger product tubers, particularly in the case of agglomerating products, would be gripped by the cells and transported through the dryer, which leads to the disadvantages described above. With the rotor internals described in DE-A-2 724 281 it is only achieved that the heat exchange and thus the dryer performance is improved.
Der Erfindung liegt die Aufgabe zugrunde, einen Dünnschichtkontakttrockner zu entwikkeln, der in jedem Falle ein knollenfreies pulverförmiges Trockengut liefert.The invention has for its object to develop a thin-film contact dryer, which in any case delivers a lump-free powdered dry material.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß im mittleren bis hinteren Drittel des Rotors mindestens ein mit dem Rotor umlaufendes und Produktknollen zurückhaltendes Ringwehr angebracht ist, das aus einer ringförmigen durchgehenden Scheibe besteht, zur inneren Trocknerwand einen schmalen Ringspalt offen läßt und in Strömungsrichtung gesehen unmittelbar hinter den als Zerkleinerungsorgane für die Produktknollen wirkenden Verteilelementen angeordnet ist.This object is achieved in that in the middle to the rear third of the rotor at least one ring weir rotating and retaining product bulbs is attached, which consists of an annular continuous disc, leaves a narrow annular gap to the inner dryer wall and seen in the flow direction immediately behind the distributing elements which act as comminution organs for the product tubers is arranged.
Vorteilhaft ist dabei die Weite d des Ringspaltes größer als der Abstand s der Verteilelemente von der Trocknerwand.The width d of the annular gap is advantageously greater than the distance s of the distribution elements from the dryer wall.
Bei Substanzen, die besonders stark zum Klumpen und zur Knollenbildung neigen, hat sich eine Ausführungsform bewährt, bei der mehrere Einheiten von Verteilelementen und Ringwehr hintereinandergeschaltet sind.In the case of substances which have a particularly strong tendency to clump and form bulbs, an embodiment in which several units of distributing elements and ring weirs are connected in series has proven successful.
Durch den Ringspalt wird die Förderung der schon pulvrig rieselfähigen Produktanteile, die durch die hohen Fliehkräfte in dünner Schicht über den Trocknerumfang verteilt werden, nicht behindert. Dagegen werden die Knollen vom Ringwehr so lange zurückgehalten, bis sie von den Verteilelementen erfaßt werden und zu Pulver zerkleinert ebenfalls den Ringspalt passieren können. Die Partikelgröße des Trockengutes entspricht dann maximal der Weite des Ringspaltes. Ein besonderer Vorteil liegt darin, daß .keine komplizierten Umbauten am Dünnschichttrockner erforderlich sind. Ringwehr und zugehörige Verteilelemente können auch nachträglich leicht in bereits vorhandene Anlagen eingebaut werden. Auf diese Weise können die zahlreichen Vorteile des Dünnschichtkontakttrockners auch für solche Produkte genutzt werden, die wegen ihrer Neigung zum Agglomerieren bzw. zur Knollenbildung bisher in anderer Weise getrocknet werden mußten.The annular gap does not hinder the conveyance of the already powdery, free-flowing product parts which are distributed over the circumference of the dryer in a thin layer due to the high centrifugal forces. In contrast, the bulbs are held back by the ring weir until they are gripped by the distribution elements and crushed into powder can also pass through the ring gap. The particle size of the dry material then corresponds at most to the width of the annular gap. A particular advantage is that no complicated modifications to the thin-film dryer are required. Ring weirs and associated distribution elements can also be easily retrofitted into existing systems. In this way, the numerous advantages of the thin-film contact dryer can also be used for products which, because of their tendency to agglomerate or to form tubers, had previously had to be dried in a different way.
Im folgenden wird ein Ausführungsbeispiel der Erfindung anhand von Zeichnungen näher erläutert. Es zeigt
- Fig. 1 den prinzipiellen Aufbau eines Dünnschichttrockners,
- Fig. 2 einen Ausschnitt des Dünnschichttrockners mit Verteilelementen und Ringwehr,
- Fig. 3 einen Schnitt A/B gemäß Fig. 2.
- 1 shows the basic structure of a thin-film dryer,
- 2 shows a section of the thin-film dryer with distribution elements and ring weir,
- 3 shows a section A / B according to FIG. 2.
Der Dünnschichtkontakttrockner gemäß Fig. 1 wird grundsätzlich horizontal aufgestellt. Seine wesentlichen Bestandteile sind das zylindrische Gehäuse 1, der Rotor 2 mit Rotorelementen 3 und die Eintragsschnecke 4 am rechten Ende. Bei den Rotorelementen handelt es sich in bekannter We um Förder-, Feder- und Umwälzelemente. Das Trocknergehäuse 1 ist mit einem Heizmantel 5 versehen. An den Enden des Trockners befinden sich Abschlußflansche 6 und 7. Das zu trocknende pastenförmige Gut wird im Bereich der Eintragsschnecke 4 durch den Stutzen 8 eindosiert. Anschließend wird es von den Rotorflügeln 3 erfaßt und an die Innenwand 9 des Trockenraumes geschleudert. Aufgrund der auftretenden Zentrifugalkräfte bleibt die Produktförderung auf eine schmale ringförmige Zone an der Trocknerinnenwand 9 beschränkt. Das getrocknete Produkt wird am Produktaustrag 10 am linken Ende des Trockners entnommen. Die entstehenden Brüden werden durch den Stutzen 11 abgesaugt.1 is basically set up horizontally. Its main components are the cylindrical housing 1, the
Im mittleren Drittel des Trockners ist der Rotor mit einem Ringwehr 13 und den zugehörigen Verteilelementen 12 bestückt (s. vergrößerter Ausschnitt gemäß Fig. 2 und 3). Das Ringwehr 13 folgt in Strömungsrichtung gesehen, d. h. von rechts nach links, unmittelbar auf die zugehörigen Verteilelemente 12. Die Form des Ringwehrs 13 und der zugehörigen Verteilelemente 12 ist aus Fig. ersichtlich. Die Verteilelemente 12 bestehen aus zurückgebogenen Blechen, die zentral am Rotor 2 befestigt sind und unmittelbar vor der Innenwand 9 des Trockners enden. Der Abstand s zwischen der Außenkante der Verteilbleche 12 und der Innenwand 9 liegt z. B. in der Größenordnung von 1 mm. Das unmittelbar darauffolgende Ringwehr 13 besteht aus einer ringförmigen Scheive, die in der Mitte durch Stege 14 am Rotor 2 befestigt ist. Der Radius der ringförmigen Scheibe ist so bemessen, das zwischen ihrem äußeren Rand und der Innenwand 9 des Trockners ein schmaler Ringspalt 15 verbleibt. Seine Spaltweite d muß größer sein als der Spalt s zwischen den Verteilelementen 12 und der Trocknerwand 9. Er liegt in der Praxis zwischen 2 und 5 mm. Nach Möglichkeit soll das Ringwehr 13 bündig an die Verteilelemente anschließen. Der Abstand Ringwehr-Verteilelemente darf aber keinesfalls größer sein als die Weite d des Ringspaltes 15.In the middle third of the dryer, the rotor is equipped with a
Das Feuchtgut 16, das teilweise zu Knollen 17 agglomeriert ist, wird aufgrund der Zentrifugalkräfte an der Innenwand 9 des Trockners entlangtransportiert und dabei durch die vom Heizmantel 5 zugeführte Wärme getrocknet. Sobald die Knollen 17 in den Einzugsbereich der Verteilelemente 12 gelangen, werden sie durch Druck und Reibung zerkleinert. Das Ringwehr 13 verhindert, daß die Knollen 17 zwischen den zugehörigen Verteilelementen 12 hindurchrollen und von diesen überhaupt nicht erfaßt werden. Die Wirkungsweise des Ringwehrs 13 besteht also darin, daß im Bereich der zugehörigen Verteilelemente 12 ein Rückstau der Knollen 17 auftritt. Durch die großen halbkreisförmigen Öffnungen 18 im Ringwehr 13 können die Brüden ungehindert abströmen. Den gleichen Zweck wie das beschriebene Ringwehr 13 würde daher auch eine Stauscheibe mit Öffnungen (zum Durchtritt der Brüden) erfüllen.The
Bei besonders stark agglomerierenden Produkten kann die Wahrscheinlichkeit der Knollenbildung noch weiter herabgesetzt werden, wenn mehrere Einheiten von Ringwehr 13 und Verteilelementen 12 im Trockner hintereinandergeschaltet werden.In the case of particularly strongly agglomerating products, the likelihood of tuber formation can be reduced even further if several units of
Die Lage einer solchen Einheit im Trockner ist nicht sehr kritisch. Es empfiehlt sich jedoch, das Ringwehr in Verbindung mit den zugehörigen Verteilelementen in einer Entfernung vom Produkteintrag 8 anzubringen, die mindestens 1 Drittel und höchstens 2 Drittel der Rotorlänge L entspricht. Wird das Ringwehr 13 zu nahe am Eintrag 8 angeordnet, so kann der Spalt 15 durch noch nicht in die Pulverphase überführtes Produkt verstopft werden. Bei einer Anbringung zu nahe am Produktaustrag 10 ist andererseits nicht mehr gewährleistet, daß die zerkleinerten Knollenbestandteile noch ausreichend getrocknet werden.The location of such a unit in the dryer is not very critical. However, it is recommended to install the ring weir in connection with the associated distribution elements at a distance from the
Bei Versuchen mit dieser Vorrichtung ergab sich, daß auch bei stark agglomerierenden Substanzen (starke Neigung zu Knollenbildung) im Trockengut am Produktaustrag 10 nur noch Partikel mit einer Korngröße < vorhanden waren. Damit konnte der Anwendungsbereich für Dünnschichtkontakttrockner auch auf knollenbildende Produkte erweitert werden. Ein wichtiger wirtschaftlicher Aspekt der Erfindung liegt ferner darin, daß Ringwehr 13 und zugehörige Verteilelemente 12 jederzeit nachträglich in vorhandene Anlagen eingebaut werden können.Experiments with this device showed that even with strongly agglomerating substances (strong tendency to form tubers) in the dry material at the
Claims (3)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2911549A DE2911549C2 (en) | 1979-03-23 | 1979-03-23 | Thin film contact dryer |
| DE2911549 | 1979-03-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0017040A1 EP0017040A1 (en) | 1980-10-15 |
| EP0017040B1 true EP0017040B1 (en) | 1983-03-02 |
Family
ID=6066278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80101291A Expired EP0017040B1 (en) | 1979-03-23 | 1980-03-13 | Thin-film contact dryer |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4420892A (en) |
| EP (1) | EP0017040B1 (en) |
| JP (2) | JPS55149603A (en) |
| DE (2) | DE2911549C2 (en) |
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| US8974756B2 (en) | 2012-07-25 | 2015-03-10 | ADA-ES, Inc. | Process to enhance mixing of dry sorbents and flue gas for air pollution control |
| US9957454B2 (en) | 2012-08-10 | 2018-05-01 | ADA-ES, Inc. | Method and additive for controlling nitrogen oxide emissions |
| US10350545B2 (en) | 2014-11-25 | 2019-07-16 | ADA-ES, Inc. | Low pressure drop static mixing system |
| JP6263658B1 (en) * | 2017-03-24 | 2018-01-17 | 佐竹化学機械工業株式会社 | Stirrer |
| JP6518315B2 (en) * | 2017-12-18 | 2019-05-22 | 佐竹化学機械工業株式会社 | Stirring device for evaporation and concentration of liquids |
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| FR993243A (en) * | 1949-06-14 | 1951-10-29 | Drying device | |
| DE1213385C2 (en) * | 1960-01-16 | 1976-01-15 | Draiswerke Gmbh, 6800 Mannheim | MIXER |
| GB1174072A (en) * | 1967-02-01 | 1969-12-10 | Okawara Siesakusho Kk | Drying apparatus comprising a device for Burning and Deodorizing Odorous Gases |
| US3617225A (en) * | 1967-06-22 | 1971-11-02 | Vickers Zimmer Ag | Polycondensation apparatus |
| CH535413A (en) * | 1971-07-01 | 1973-03-31 | Luwa Ag | Device for drying a flowable substance |
| DE2724281A1 (en) * | 1977-05-28 | 1978-11-30 | Vasily Vasilievitsch Mamistov | Dryer for particulates - has rotor blades provided at ends with transverse arcuate portions to form conveying pockets |
-
1979
- 1979-03-23 DE DE2911549A patent/DE2911549C2/en not_active Expired
-
1980
- 1980-03-13 DE DE8080101291T patent/DE3062161D1/en not_active Expired
- 1980-03-13 EP EP80101291A patent/EP0017040B1/en not_active Expired
- 1980-03-21 JP JP3482680A patent/JPS55149603A/en active Pending
-
1982
- 1982-01-29 US US06/343,791 patent/US4420892A/en not_active Expired - Fee Related
-
1988
- 1988-02-02 JP JP1988012248U patent/JPS63133301U/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE2911549C2 (en) | 1981-10-01 |
| JPS63133301U (en) | 1988-08-31 |
| US4420892A (en) | 1983-12-20 |
| EP0017040A1 (en) | 1980-10-15 |
| DE2911549A1 (en) | 1980-09-25 |
| DE3062161D1 (en) | 1983-04-07 |
| JPS55149603A (en) | 1980-11-21 |
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