EP0660059A1 - Apparatus for drying bulk material - Google Patents
Apparatus for drying bulk material Download PDFInfo
- Publication number
- EP0660059A1 EP0660059A1 EP94118377A EP94118377A EP0660059A1 EP 0660059 A1 EP0660059 A1 EP 0660059A1 EP 94118377 A EP94118377 A EP 94118377A EP 94118377 A EP94118377 A EP 94118377A EP 0660059 A1 EP0660059 A1 EP 0660059A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- container
- air
- bulk
- bulk material
- drying
- 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.)
- Granted
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- 239000013590 bulk material Substances 0.000 title claims abstract description 26
- 238000001035 drying Methods 0.000 title claims description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000007605 air drying Methods 0.000 claims abstract description 7
- 238000009413 insulation Methods 0.000 claims description 4
- 239000008187 granular material Substances 0.000 description 8
- 238000009833 condensation Methods 0.000 description 5
- 229920000728 polyester Polymers 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 229920000426 Microplastic Polymers 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
- F26B21/083—Humidity by using sorbent or hygroscopic materials, e.g. chemical substances, molecular sieves
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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
- F26B9/10—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 device for drying bulk goods according to the preamble of the main claim.
- Such a device is known from DE-GM 89 10 764.2.
- the known device feeds the dried air to the bulk material container via a flanged pipe, is heated by an electric heater and flows into the bulk material to be dried in the lower region of the bulk material container.
- the bulk material is heated with this device directly in the area of the container outlet.
- the warm, dry air flows upwards, heats the bulk material and extracts moisture from it, which is extracted in the upper area of the container by an exhaust air outlet.
- a disadvantage of this known device is to be seen in the fact that the air supply pipe is surrounded by bulk material and the bulk material directly adjacent to the air supply pipe is heated very strongly and may be thermally damaged.
- the entry temperature of the dry air into the granulate is lower than the temperature measured with the temperature sensor, because on the way through the cold granulate or .Cool return air downwards causes considerable radiation losses and thus cools the dry air.
- the temperature sensor is arranged directly in the lower part of the air distributor, this means that the air temperature in the upper part of the air supply pipe is significantly higher and the granules which are in direct contact with the pipe are therefore subjected to an excess temperature treatment.
- the invention is therefore based on the object of avoiding the disadvantages mentioned and of providing a device for drying bulk material, in which a uniform drying of the bulk material is possible with low temperature losses and a uniform temperature distribution both vertically and is given horizontally.
- the main advantage of the invention can be seen in the fact that the thermal energy of the dried air or the dried gas is now made available directly where it is needed, namely at the drying hopper, namely to the temperature value as specified by the control system. An undefined release of heat can be effectively prevented with the invention.
- the invention shows a further increase in efficiency.
- the amount of air throughput through the bulk material drying container is reduced with increasing exhaust air temperature and increased with decreasing exhaust air temperature.
- the exhaust air temperature is measured directly at the air outlet of the container or in the return air line.
- the thermal insulation of the pipe, which supplies the dried air to the bulk material container effectively prevents the exhaust air temperature from being falsified.
- the invention can be used for drying plastic granules, it can be used in the same way for post-condensation of PET. Here, too, it is particularly important to achieve a uniform temperature profile for the granulate over a long residence time.
- the drying hopper which is also called the reactor in the post-condensation of PET, can also be equipped with a hopper wall heating.
- this is thermally insulated Tube designed as a double-walled tube.
- the space between the two pipes can be evacuated or filled with a heat-insulating gas
- An alternative embodiment provides for the tube to be provided with an inner, flexible and temperature-resistant hose. This also creates a double-walled tube. The heat transfer can be greatly reduced by using a suitable hose material.
- the heating device for heating the dry gas either in the pipe running inside the container or directly at the entrance of the pipe into the container. This can minimize heat conduction losses.
- the drawing shows: a bulk container for drying bulk material in a sectional view.
- the drawing schematically shows a bulk container 10 with a filler neck 25 through which the bulk material 18 is fed, a bulk material removal 23 and a device 12 for blowing in the dry and heated air.
- An air drying device 11 is provided for generating dry air. This is supplied with moist air via an exhaust air line 14. The dehumidified air reaches the bulk goods container 10 via a supply air line 13.
- a Air drying device 11 is generally known and described for example in DE-PS 31 31 471.
- the drying air is in a closed air circuit and is moved by a fan which is arranged in the air drying device.
- the dry air supplied to the container 10 via the line 13 passes through a heating station 15 and then at the upper region of the container via a flange connection 16 into the interior of the container.
- the pipe 17 arranged inside the container 10 for guiding the heated dry air into the lower region of the container is double-walled.
- the space between the two tubes can be evacuated or filled with a gas.
- the heated and dried gas flows into the bulk material to be dried via an air distributor 18, absorbs the moisture and supplies it to the air drying device 11 via the line 14.
- the device according to the invention is also able to increase the efficiency and process reliability in the post-condensation of PET.
- the drying process takes place in a manner similar to the drying process shown here, temperatures of 200 ° C. and residence times of over 20 hours having to be observed.
- it is particularly important to achieve a uniform temperature profile for the granulate over the long residence time.
- the drying hopper which is also called the reactor, also has a hopper wall heating, for example in the manner of a double jacket with an oil circuit.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Drying Of Solid Materials (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Wenigstens einer Schüttgutbehälter (10) ist in einem geschlossenen Luftkreislauf mit einer Lufttrocknungseinrichtung (11) und einer Heizeinrichtung (15) verbunden. Die trockene, erwärmte Luft wird mittels eines Gebläses durch das Schüttgut (18) bewegt wird um dem Schüttgut Feuchtigkeit zu entziehen. Die mit Feuchte beladene Abluft wird aus dem Schüttgutbehälter (10) abgezogen, anschließend wieder getrocknet und mittels der Heizeinrichtung (15) aufgeheizt und dann erneut dem Schüttgutbehälter zugeführt. Im oberen Bereich des Schüttgutbehälters (10) ist ein Anschluß (16) für die Zuführung der trockenen Luft vorgesehen. Dieser Anschluß mündet in ein mittig im Behälter angeordnetes Rohr (17), dessen unteres Ende mit einem Luftverteiler (18) ausgestattet ist. Das Rohr (17), welches innerhalb des Schüttgutbehälters (10) verläuft, ist wärmeisolierend ausgeführt. <IMAGE>At least one bulk container (10) is connected in a closed air circuit with an air drying device (11) and a heating device (15). The dry, heated air is moved through the bulk material (18) by means of a blower in order to extract moisture from the bulk material. The exhaust air laden with moisture is drawn off from the bulk material container (10), then dried again and heated by means of the heating device (15) and then fed again to the bulk material container. In the upper area of the bulk goods container (10) there is a connection (16) for the supply of dry air. This connection opens into a tube (17) arranged in the center of the container, the lower end of which is equipped with an air distributor (18). The tube (17), which runs inside the bulk goods container (10), is heat-insulating. <IMAGE>
Description
Die Erfindung betrifft eine Vorrichtung zum Trocknen von Schüttgut nach dem Oberbegriff des Hauptanspruchs.The invention relates to a device for drying bulk goods according to the preamble of the main claim.
Eine solche Vorrichtung ist aus dem DE-GM 89 10 764.2 bekannt. Die bekannte Vorrichtung führt die getrocknete Luft über ein seitlich angeflanschtes Rohr dem Schüttgutbehälter zu, wird über eine elektrische Heizung erwärmt und strömt im unteren Bereich des Schüttgutbehälters in das zu trocknende Schüttgut. Die Erwärmung des Schüttguts erfolgt mit dieser Einrichtung unmittelbar im Bereich des Behälterauslaufs. Die warme, trockene Luft strömt nach oben, erwärmt das Schüttgut und entzieht diesem Feuchtigkeit, die im oberen Bereich des Behälters durch ein Abluftaustritt abgesaugt wird.Such a device is known from DE-GM 89 10 764.2. The known device feeds the dried air to the bulk material container via a flanged pipe, is heated by an electric heater and flows into the bulk material to be dried in the lower region of the bulk material container. The bulk material is heated with this device directly in the area of the container outlet. The warm, dry air flows upwards, heats the bulk material and extracts moisture from it, which is extracted in the upper area of the container by an exhaust air outlet.
Durch die seitlich am Schüttgutbehälter angeordnete Heizung und die dort in den Behälter eingeleitete erwärmte Luft existiert in diesem Bereich ein Temperaturunterschied, auf der einen Seite zur Abluft und auf der andere Seite zum Schüttgut. Außerdem wird der Schüttgutdurchfluß in dem genannten Bereich durch die Anordnung von Heizung und Luftzufuhrrohr behindert.As a result of the heating arranged on the side of the bulk goods container and the heated air introduced there into the container, there is a temperature difference in this area, on one side to the exhaust air and on the other side to the bulk material. In addition, the bulk material flow in the area mentioned is hindered by the arrangement of the heater and air supply pipe.
Aus der DE 36 37 700 ist ebenfalls eine Vorrichtung zum Trocknen von Schüttgut bekannt. Dort wird die trockene, erwärmte Luft mittig dem Schüttgutbehälter zugeführt und strömt am unteren Ende des Behälters über ein Luftverteilerrohr aus.From DE 36 37 700 a device for drying bulk goods is also known. There, the dry, heated air is fed into the center of the bulk goods container and flows out at the lower end of the container through an air distributor pipe.
Ein Nachteil dieser bekannten Einrichtung ist darin zu sehen, daß das Luftzufuhrrohr von Schüttgut umgeben ist und das unmittelbar dem Luftzufuhrrohr benachbarte Schüttgut sehr stark erwärmt und unter Umständen thermisch geschädigt wird.A disadvantage of this known device is to be seen in the fact that the air supply pipe is surrounded by bulk material and the bulk material directly adjacent to the air supply pipe is heated very strongly and may be thermally damaged.
Während bei dem erstgenannten Stand der Technik das seitlich am Behälter angeordnete Luftzufuhrrohr nachteilig für die Produktströmung ist, kann bei dem, im Stand der Technik gemäß DE 36 37 700 bekannten, von oben mittig über die ganze zylindrische Höhe des Behälters geführte Luftrohr zwar ein gleichmäßiger Massenfluß aufgebaut werden, es besteht jedoch der Nachteil, daß die Temperaturführung für die Lufteintrittstemperatur im Granulat schwer zu regeln ist.While in the first-mentioned prior art the air supply pipe arranged on the side of the container is disadvantageous for the product flow, in the air pipe, known in the prior art according to DE 36 37 700, guided from above over the entire cylindrical height of the container, a uniform mass flow be built up, but there is the disadvantage that the temperature control for the air inlet temperature in the granules is difficult to regulate.
So ist z.B. im Rahmen einer Hochtemperaturtrocknung bei welcher die Heizung direkt am Behälter angeflanscht ist und der Temperaturfühler für die Heizungsregelung unmittelbar hinter der Heizung liegt, die Eintrittstemperatur der Trockenluft in das Granulat geringer als die mit dem Temperaturfühler gemessene Temperatur, da auf dem Weg durch das kalte Granulat bzw. kalte Rückluft nach unten erhebliche Abstrahlungsverluste auftreten und damit die Trockenluft abkühlt.For example, In the context of high temperature drying, in which the heating is flanged directly to the container and the temperature sensor for the heating control is located directly behind the heating, the entry temperature of the dry air into the granulate is lower than the temperature measured with the temperature sensor, because on the way through the cold granulate or .Cool return air downwards causes considerable radiation losses and thus cools the dry air.
Ist der Temperaturfühler direkt im unteren Teil des Luftverteilers angeordnet bedeutet dies, daß die Lufttemperatur im oberen Teil des Luftzufuhrrohres deutlich höher ist und somit die Granulatkörner, die direkt mit dem Rohr in Kontakt sind, einer Übertemperaturbehandlung ausgesetzt wird.If the temperature sensor is arranged directly in the lower part of the air distributor, this means that the air temperature in the upper part of the air supply pipe is significantly higher and the granules which are in direct contact with the pipe are therefore subjected to an excess temperature treatment.
Der Erfindung liegt daher die Aufgabe zugrunde, die genannten Nachteile zu vermeiden und eine Einrichtung zum Trocknen von Schüttgut zu schaffen, bei welcher eine gleichmäßige Trocknung des Schüttgutes bei geringen Temperaturverlusten möglich ist und eine gleichmäßige Temperaturverteilung sowohl vertikal, wie auch horizontal gegeben ist.The invention is therefore based on the object of avoiding the disadvantages mentioned and of providing a device for drying bulk material, in which a uniform drying of the bulk material is possible with low temperature losses and a uniform temperature distribution both vertically and is given horizontally.
Diese Aufgabe wird ausgehend von dem Oberbegriff des Hauptanspruchs durch dessen kennzeichnenden Merkmale gelöst.This object is achieved on the basis of the preamble of the main claim by its characterizing features.
Der wesentliche Vorteil der Erfindung ist darin zu sehen, daß nunmehr die Wärmeenergie der getrockneten Luft oder des getrockneten Gases unmittelbar dort zur Verfügung gestellt wird, wo sie gebraucht wird, nämlich an dem Trocknungstrichter und zwar auf den Temperaturwert wie er von der Regelung vorgegeben ist. Eine undefinierte Abgabe von Wärme kann mit der Erfindung wirksam unterbunden werden.The main advantage of the invention can be seen in the fact that the thermal energy of the dried air or the dried gas is now made available directly where it is needed, namely at the drying hopper, namely to the temperature value as specified by the control system. An undefined release of heat can be effectively prevented with the invention.
Insbesondere bei einem automatischen Lastanpassungsverfahren, wie es aus dem DE-Patent 31 31 471 bekannt ist, zeigt die Erfindung eine weitere Erhöhung der Effizienz. Bei dem bekannten Verfahren wird die Menge des Luftdurchsatzes durch den Schüttguttrocknungsbehälter bei steigender Ablufttemperatur herabgesetzt, bei sinkender Ablufttemperatur erhöht. Die Ablufttemperatur wird dabei unmittelbar am Luftaustritt des Behälters oder in der Rückluftleitung gemessen. Durch die Wärmeisolation des Rohres, welches die getrocknete Luft dem Schüttgutbehälter zuführt, wird eine Verfälschung der Ablufttemperatur wirksam verhindert.In particular in the case of an automatic load adjustment method, as is known from DE patent 31 31 471, the invention shows a further increase in efficiency. In the known method, the amount of air throughput through the bulk material drying container is reduced with increasing exhaust air temperature and increased with decreasing exhaust air temperature. The exhaust air temperature is measured directly at the air outlet of the container or in the return air line. The thermal insulation of the pipe, which supplies the dried air to the bulk material container, effectively prevents the exhaust air temperature from being falsified.
Die Erfindung kann wie beschrieben zur Trocknung von Kunststoffgranulat dienen, sie kann in gleicher Weise zur Nachkondensation von PET benutzt werden. Auch hier ist es besonders wichtig, ein gleichmäßiges Temperaturprofil des Granulats über eine lange Verweilzeit zu erreichen. Der Trocknungstrichter der bei der Nachkondensation von PET auch Reaktor genannt wird, kann auch mit einer Trichterwandbeheizung ausgestattet sein.As described, the invention can be used for drying plastic granules, it can be used in the same way for post-condensation of PET. Here, too, it is particularly important to achieve a uniform temperature profile for the granulate over a long residence time. The drying hopper, which is also called the reactor in the post-condensation of PET, can also be equipped with a hopper wall heating.
Gemäß einer vorteilhaften Ausgestaltung ist das wärmeisolierte Rohr als doppelwandiges Rohr ausgebildet. Zur Verbesserung der Wärmeisolation kann der Zwischenraum zwischen den beiden Rohren evakuiert oder mit einem wärmeisolierendem Gas gefüllt seinAccording to an advantageous embodiment, this is thermally insulated Tube designed as a double-walled tube. To improve the heat insulation, the space between the two pipes can be evacuated or filled with a heat-insulating gas
Eine alternative Ausgestaltung sieht vor, das Rohr mit einem innen liegenden, flexiblen und temperaturbeständigen Schlauch zu versehen. Auch hierdurch bildet sich ein doppelwandiges Rohr aus. Der Wärmeübergang kann durch ein geeignetes Schlauchmaterial sehr stark reduziert werden.An alternative embodiment provides for the tube to be provided with an inner, flexible and temperature-resistant hose. This also creates a double-walled tube. The heat transfer can be greatly reduced by using a suitable hose material.
Um eine optimale Produktströmung zu erzielen ist es zweckmäßig und gemäß einer weiteren Ausgestaltung der Erfindung vorgesehen, das Rohr zur Zuführung der getrockneten Luft am oberen Abschluß des Behälters konzentrisch in diesen Behälter einzuführen oder im oberen Bereich des Behälters seitlich einzuführen und über einen Bogen in eine mittige Lage zu überführen.In order to achieve an optimal product flow, it is expedient and, according to a further embodiment of the invention, to introduce the tube for supplying the dried air concentrically into this container at the upper end of the container or to insert it laterally in the upper region of the container and via an arc into a center Able to convict.
Diese Art der Luftführung in Verbindung mit dem isolierten Luftverteilerrohr gewinnt deswegen an Bedeutung weil speziell bei der Behandlung von Polyestergranulat bzw. Polyesterschnitzel eine absolut gleichmäßiges Verweilzeitspektrum unter hoher Temperatur hinsichtlich der Trockenluft sichergestellt werden muß.This type of air flow in connection with the insulated air distribution pipe is gaining in importance because, especially in the treatment of polyester granules or polyester chips, an absolutely uniform residence time spectrum under high temperature with regard to the dry air must be ensured.
Eine gleichmäßige Nachkondensation bzw. Trocknung von Polyestergranulat oder Polyesterschnitzel kann nur dann erfolgen, wenn bei einem kontinuierlichen Prozeß sichergestellt ist, daß jedes einzelne Korn zeitlich sowie temperaturmäßig die gleiche Verweilzeit aufweist.Uniform post-condensation or drying of polyester granules or polyester chips can only take place if it is ensured in a continuous process that each individual grain has the same residence time in terms of time and temperature.
Um weitere Wärmeverluste zu vermeiden ist es gemäß einer weiteren Ausgestaltung der Erfindung vorgesehen, die Heizeinrichtung zum Aufheizen des Trockengases entweder im innerhalb des Behälters verlaufenden Rohr oder unmittelbar am Eingang des Rohres in den Behälter anzuordnen. Damit können die Wärmeleitungsverluste minimiert werden.In order to avoid further heat losses, it is provided according to a further embodiment of the invention to arrange the heating device for heating the dry gas either in the pipe running inside the container or directly at the entrance of the pipe into the container. This can minimize heat conduction losses.
Diese und weitere Merkmale von bevorzugten Weiterbildungen der Erfindung gehen außer aus den Ansprüchen auch aus der Beschreibung und den Zeichnungen hervor, wobei die einzelnen Merkmale jeweils für sich allein oder zu mehreren in Form von Unterkombinationen bei der Ausführungsform der Erfindung und auf anderen Gebieten verwirklicht sein und vorteilhafte sowie für sich schutzfähige Ausführungen darstellen können, für die hier Schutz beansprucht wird.These and further features of preferred developments of the invention are evident from the claims and also from the description and the drawings, the individual features being implemented individually or in groups in the form of subcombinations in the embodiment of the invention and in other fields, and can represent advantageous and protectable versions for which protection is claimed here.
Sofern bei der Erfindung bzw. bei Ausgestaltung der Erfindungen von trockener Luft oder Trockenluft die Rede ist, ist sowohl natürlich Luft als auch jede Art von Gas und jede Art von Gaszusammensetzung zu verstehen. Die Erfindung beschränkt sich nicht auf die Anwendung einer bestimmten Gaszusammensetzung.If dry air or dry air is mentioned in the invention or in the embodiment of the inventions, air is to be understood naturally as well as any type of gas and any type of gas composition. The invention is not restricted to the use of a specific gas composition.
Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im folgenden näher erläutert. Die Zeichnung zeigt:
ein Schüttgutbehälter zum Trocknen von Schüttgut in einer Schnittdarstellung.Embodiments of the invention are shown in the drawings and are explained in more detail below. The drawing shows:
a bulk container for drying bulk material in a sectional view.
Die Zeichnung zeigt schematisch einen Schüttgutbehälter 10 mit einem Einfüllstutzen 25 über welchen das Schüttgut 18 zugeführt wird, einer Schüttgutentnahme 23 und einer Einrichtung 12 zum Einblasen der trockenen und erwärmten Luft. Zur Erzeugung von Trockenluft ist eine Lufttrocknungseinrichtung 11 vorgesehen. Dieser wird feuchte Luft über eine Abluftleitung 14 zugeführt. Die entfeuchtete Luft gelangt über eine Zuluftleitung 13 an den Schüttgutbehälter 10.The drawing schematically shows a bulk container 10 with a
In der Zeichnung ist nur ein Schüttgutbehälter dargestellt, es ist jedoch selbstverständlich möglich, weitere Schüttgutbehälter mit der Lufttrocknungseinrichtung 11 zu versorgen. Eine Lufttrocknungseinrichtung 11 ist allgemein bekannt und beispielsweise in der DE-PS 31 31 471 beschrieben. Die Trocknungsluft befindet sich in einem geschlossenen Luftkreislauf und wird durch ein Gebläse, welches in der Lufttrocknungseinrichtung angeordnet ist, bewegt. Die über die Leitung 13 dem Behälter 10 zugeführte trockene Luft gelangt durch eine Aufheizstation 15 und anschließend am oberen Bereich des Behälters über einen Flanschanschluß 16 in den Innenraum des Behälters. Das im Innern des Behälters 10 angeordnete Rohr 17 für die Führung der erwärmten trockenen Luft in den unteren Bereich des Behälters ist doppelwandig ausgestaltet. Selbstverständlich besteht auch die Möglichkeit, ein einwandiges Rohr mit einem innen liegenden flexiblen Schlauch, z.B. aus Silikon oder PUR, auszustatten. Durch die Anwendung eines flexiblen Schlauches in einem Rohr wird ebenfalls eine sehr gute Wärmeisolation erzielt. Bei der Anwendung eines doppelwandigen Rohrs, wie es in der Figur dargestellt ist, kann der Zwischenraum zwischen den beiden Rohren evakuiert sein oder mit einem Gas gefüllt sein.Only one bulk container is shown in the drawing, but it is of course possible to supply further bulk containers with the air drying device 11. A Air drying device 11 is generally known and described for example in DE-PS 31 31 471. The drying air is in a closed air circuit and is moved by a fan which is arranged in the air drying device. The dry air supplied to the container 10 via the
Im unteren Bereich des Behälters 10 strömt das erwärmte und getrocknete Gas über einen Luftverteiler 18 in das zu trocknende Schüttgut, nimmt die Feuchtigkeit auf und führt diese über die Leitung 14 der Lufttrocknungseinrichtung 11 zu.In the lower region of the container 10, the heated and dried gas flows into the bulk material to be dried via an
Auch bei der Nachkondensation von PET ist die erfindungsgemäße Einrichtung in der Lage, die Effizienz und Prozeßsicherheit zu erhöhen. Bei dieser Nachkondensation läuft der Trocknungsprozeß ähnlich dem hier dargestellten Trocknungsprozeß ab, wobei Temperaturen Größe 200 |C und Verweilzeiten von über 20 Stunden eingehalten werden müssen. Auch hier ist es besonders wichtig, eine gleichmäßiges Temperaturprofil des Granulats über die lange Verweilzeit zu erreichen. Der Trocknungstrichter, welcher auch Reaktor genannt ist, besitzt zusätzlich um Temperaturgradienten zu verhindern eine Trichterwandbeheizung, zum Beispiel in Art eines Doppelmantels mit einem Ölkreislauf.The device according to the invention is also able to increase the efficiency and process reliability in the post-condensation of PET. With this post-condensation, the drying process takes place in a manner similar to the drying process shown here, temperatures of 200 ° C. and residence times of over 20 hours having to be observed. Here, too, it is particularly important to achieve a uniform temperature profile for the granulate over the long residence time. In order to prevent temperature gradients, the drying hopper, which is also called the reactor, also has a hopper wall heating, for example in the manner of a double jacket with an oil circuit.
Claims (5)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4344593A DE4344593C1 (en) | 1993-12-24 | 1993-12-24 | Apparatus for drying bulk material |
| DE4344593 | 1993-12-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0660059A1 true EP0660059A1 (en) | 1995-06-28 |
| EP0660059B1 EP0660059B1 (en) | 1999-06-09 |
Family
ID=6506307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94118377A Expired - Lifetime EP0660059B1 (en) | 1993-12-24 | 1994-11-23 | Apparatus for drying bulk material |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5509216A (en) |
| EP (1) | EP0660059B1 (en) |
| JP (1) | JP2695388B2 (en) |
| AT (1) | ATE181150T1 (en) |
| DE (2) | DE4344593C1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114812122A (en) * | 2022-05-24 | 2022-07-29 | 华能铜川照金煤电有限公司西川煤矿分公司 | Drying device for coal ore dressing |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT412467B (en) * | 2001-05-31 | 2005-03-25 | Luger Ges M B H | DEVICE FOR SUCTION OR PRESSURE DELIVERY OF DUST OR GRANULATE MATERIAL |
| DE10352106B4 (en) * | 2003-11-04 | 2016-12-15 | Roderich W. Gräff | Method for controlling the gas throughput of bulk materials |
| ITPD20040258A1 (en) * | 2004-10-18 | 2005-01-18 | Moretto P A Srl | HOPPER FOR DEHUMIDIFICATION OF BULK SPECIAL MATERIAL |
| DE202013100731U1 (en) * | 2013-02-19 | 2014-05-20 | Digicolor Gmbh | Device for drying plastic granules |
| CN103486840A (en) * | 2013-09-27 | 2014-01-01 | 深圳市福田区青少年科技教育协会 | Quick dryer |
| CN112229165B (en) * | 2020-11-04 | 2023-11-07 | 中国科学院理化技术研究所 | Horizontal heat pump drying system and working method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB145224A (en) * | 1919-05-17 | 1920-07-02 | Charley Tinker | An improved device for drying hay, straw and the like products |
| US3913242A (en) * | 1974-09-11 | 1975-10-21 | Gear Co M W | Preheater for grain dryer |
| US4038758A (en) * | 1975-09-30 | 1977-08-02 | Miller Russell A | Grain dryer |
| FR2569471A1 (en) * | 1984-08-24 | 1986-02-28 | Surier Albert | Cereal dryer |
| DE3637700A1 (en) * | 1986-11-05 | 1988-05-19 | Motan Gmbh | METHOD FOR REGENERATING A DRYING CARTRIDGE LOADED WITH MOISTURE AND DEVICE FOR CARRYING OUT SUCH A METHOD |
Family Cites Families (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1829477A (en) * | 1925-12-30 | 1931-10-27 | Douthitt Frank Howard | Process of and apparatus for drying liquids |
| US3920624A (en) * | 1974-01-14 | 1975-11-18 | Du Pont | Process for stripping residual solvent from polymer pellets and apparatus |
| DE2632054C3 (en) * | 1976-07-16 | 1982-05-27 | Hoechst Ag, 6000 Frankfurt | Process for drying chlorinated polyethylene |
| GB1590532A (en) * | 1976-08-04 | 1981-06-03 | Exxon Research Engineering Co | Elastomer extrusion drying with gas injection |
| DE2715790A1 (en) * | 1977-04-07 | 1978-10-12 | Polysius Ag | FLOATING GAS PREHEATER FOR FINE GOODS |
| US4199872A (en) * | 1977-09-08 | 1980-04-29 | Foster Wheeler Energy Corporation | Regeneration apparatus for producing sulfur dioxide |
| DE2800952A1 (en) * | 1978-01-11 | 1979-07-12 | Hoechst Ag | PROCESS AND SYSTEM FOR DRYING CHLORINATED POLYMERS |
| US4241021A (en) * | 1979-05-14 | 1980-12-23 | Stauffer Chemical Company | Fluidized bed reactor system |
| DE3162494D1 (en) * | 1980-06-06 | 1984-04-12 | Waagner Biro Ag | Process for regulating the through-flow of a cooling bunker |
| DE3131471A1 (en) * | 1981-03-20 | 1982-09-30 | Roderich Wilhelm Dr.-Ing. 6100 Darmstadt Gräff | DEVICE FOR DRYING HUMIDIFIER EXHAUST FROM ONE OR SEVERAL DUMP DRYING CONTAINERS |
| DE3234431A1 (en) * | 1982-09-17 | 1984-03-22 | Roderich Wilhelm Dr.-Ing. 6100 Darmstadt Gräff | METHOD AND DEVICE FOR REMOVING GASES AND STEAMS FROM DRYING FUNNELS FILLED WITH BULK MATERIAL |
| JPS59174130A (en) * | 1983-03-25 | 1984-10-02 | 株式会社日立製作所 | vacuum cleaner |
| FR2551453B1 (en) * | 1983-08-31 | 1985-10-11 | Fives Cail Babcock | COAL GASIFIER IN HIGH-PRESSURE FLUIDIZED BED |
| JPS6172126A (en) * | 1984-09-17 | 1986-04-14 | Asahi Chem Ind Co Ltd | How to construct a fence wall |
| US4706390A (en) * | 1986-04-14 | 1987-11-17 | John A. Kitchen Ltd. | Dehydrator |
| FR2626284B1 (en) * | 1988-01-26 | 1990-06-08 | Total France | APPARATUS FOR CATALYTIC CRACKING IN A FLUIDIZED BED OF A HYDROCARBON LOAD |
| DE3901597A1 (en) * | 1988-03-16 | 1989-09-28 | Amboss & Langbein Kg | Container for plastics raw material |
| DE8803539U1 (en) * | 1988-03-16 | 1988-05-11 | Amboß + Langbein KG, 5657 Haan | Container for plastic raw material |
| JPH0612211B2 (en) * | 1988-10-27 | 1994-02-16 | 株式会社松井製作所 | Dryer for synthetic resin materials |
| DE3929898A1 (en) * | 1989-09-08 | 1991-03-21 | Graeff Roderich Wilhelm | METHOD AND DEVICE FOR CONVEYING DRIED PLASTIC GRANULES |
| DE8910764U1 (en) * | 1989-09-09 | 1989-11-16 | Strack-Norma Gmbh, 5600 Wuppertal | Block clamp for clamping mold plates intended for injection molding and die casting tools |
| DE8910763U1 (en) * | 1989-09-09 | 1991-01-17 | Filterwerk Mann & Hummel Gmbh, 7140 Ludwigsburg | Device for drying bulk material |
| DE4006935A1 (en) * | 1990-03-06 | 1991-09-12 | Wacker Chemie Gmbh | Fluidised bed appts. for mixing, drying and coating bulk solids - has support tube concentrically placed around down pipe to form ring shaped aperture in mixing chamber |
| DE4029525A1 (en) * | 1990-09-18 | 1992-03-19 | Umwelt & Energietech | METHOD AND DEVICE FOR DRYING SOLID MATERIALS IN AN INDIRECTLY HEATED FLUIDIZED BED |
| US5372791A (en) * | 1992-04-20 | 1994-12-13 | Foster Wheeler Energy Corporation | Fluidized bed system and a fluidization and cooling nozzle for use therein |
-
1993
- 1993-12-24 DE DE4344593A patent/DE4344593C1/en not_active Expired - Fee Related
-
1994
- 1994-11-23 AT AT94118377T patent/ATE181150T1/en not_active IP Right Cessation
- 1994-11-23 DE DE59408392T patent/DE59408392D1/en not_active Expired - Fee Related
- 1994-11-23 EP EP94118377A patent/EP0660059B1/en not_active Expired - Lifetime
- 1994-12-20 US US08/359,819 patent/US5509216A/en not_active Expired - Fee Related
- 1994-12-26 JP JP6323239A patent/JP2695388B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB145224A (en) * | 1919-05-17 | 1920-07-02 | Charley Tinker | An improved device for drying hay, straw and the like products |
| US3913242A (en) * | 1974-09-11 | 1975-10-21 | Gear Co M W | Preheater for grain dryer |
| US4038758A (en) * | 1975-09-30 | 1977-08-02 | Miller Russell A | Grain dryer |
| FR2569471A1 (en) * | 1984-08-24 | 1986-02-28 | Surier Albert | Cereal dryer |
| DE3637700A1 (en) * | 1986-11-05 | 1988-05-19 | Motan Gmbh | METHOD FOR REGENERATING A DRYING CARTRIDGE LOADED WITH MOISTURE AND DEVICE FOR CARRYING OUT SUCH A METHOD |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114812122A (en) * | 2022-05-24 | 2022-07-29 | 华能铜川照金煤电有限公司西川煤矿分公司 | Drying device for coal ore dressing |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4344593C1 (en) | 1995-02-16 |
| US5509216A (en) | 1996-04-23 |
| ATE181150T1 (en) | 1999-06-15 |
| EP0660059B1 (en) | 1999-06-09 |
| DE59408392D1 (en) | 1999-07-15 |
| JPH07198256A (en) | 1995-08-01 |
| JP2695388B2 (en) | 1997-12-24 |
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