EP1067348B1 - Process and apparatus for drying granulate - Google Patents

Process and apparatus for drying granulate Download PDF

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Publication number
EP1067348B1
EP1067348B1 EP00112648A EP00112648A EP1067348B1 EP 1067348 B1 EP1067348 B1 EP 1067348B1 EP 00112648 A EP00112648 A EP 00112648A EP 00112648 A EP00112648 A EP 00112648A EP 1067348 B1 EP1067348 B1 EP 1067348B1
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EP
European Patent Office
Prior art keywords
drying
drying air
individual
heating device
containers
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EP00112648A
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German (de)
French (fr)
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EP1067348A1 (en
Inventor
Andreas Vierling
Gerd Adolf Richter
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Colortronic GmbH
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Colortronic GmbH
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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
    • 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
    • F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area

Definitions

  • the invention relates to a method for drying Granules in at least two drying containers using heated Drying air through the drying container connected in parallel and circulated through a drying air dryer , each drying air stream supplied to a drying tank with one assigned to this drying container Individual heating device is heated and the individual drying container supplied drying air flow depending on one of the current conditions in the concerned Drying container reflecting temperature more or less is throttled.
  • Such a method is known from EP 61 161 A.
  • There are three drying containers connected in parallel are provided, in their Branch line inlet one throttle each before Drying container is installed, which is controlled by an actuator Depending on the signal from a temperature sensor, which is arranged in the branch line outlet behind the drying container is.
  • the drying air dryer has adsorption cells on, through which the circulating drying air and a Regeneration agents (hot air) are passed through. Indeed only one common heating device is provided and at the exit of the drying air dryer is the drying air passed through the only heater before entering the Flow line to the drying containers enters.
  • the method described at the outset is known from DE 296 21 313 U.
  • the drying system described there has three in parallel switched on drying containers, each with a single heating device and a throttle device for that Drying container supplied drying air assigned are. It is therefore possible to use the drying container To feed drying air of different temperatures, which is useful, for example, if in the individual Drying containers can be dried different materials should, because of different temperature sensitivity different temperatures should be dried. There however, the air volume distribution over the individual drying containers by the extent of the throttling of the individual drying containers supplied drying air flows is determined, the situation may arise that one of the individual heating devices excessively strong with a high drying air flow is claimed so that the intended heating temperature the drying air may no longer be reached. To the Maintain the setpoint temperature in all operating states may need to be over-performing disadvantageously and thus complex individual heating devices are used become.
  • the invention is based on the object to improve known methods so that for the individual Drying container drying air of different temperatures can be provided and the target temperatures of the various drying air flows under all operating conditions can be achieved without being overly powerful Heaters must be used.
  • drying air flows not only temperature-dependent but also dependent of the respective heating output of the individual heating device in question be controlled so that when reaching predetermined heating power of the individual heater relevant drying air flow is additionally throttled, so that its heating to a preselected target temperature is independent from the distribution of drying air to the individual Drying air flows is guaranteed.
  • the provision of the individual heating devices creates the possibility the drying air flows supplied to the various drying containers according to the respective requirements to heat different temperatures. Will the capacity of a single heater because the concerned Drying air flow due to severe throttling of the others Drying air flows increases sharply and / or for the person concerned Drying air flow a comparatively high target temperature is specified, the drying air flow concerned experiences throttling until the ratio of drying air flow sufficient for the available heating capacity, to achieve the target temperature. Therefore, oversized Individual heating devices can be dispensed with without that there is a risk that under extreme operating conditions the target temperature of the drying air on one of the drying tanks is not reached.
  • the method according to the invention becomes dependent on the use of Individual heating devices that can be switched on and off automatically Conveniently carried out so that the heat output dependent Additional throttling of a drying air flow is triggered when the individual heating device in question does not turn off within a predetermined period of time.
  • the continuous operation of the individual heating device ascertained during the period is evaluated in the sense that the heating power not sufficient for the current drying air throughput to reach the target temperature.
  • the invention also relates to a device for performing of the method according to the invention with at least two Drying containers and a drying air dryer, which in a drying circuit for drying air having a blower are installed, the one flow line and one Return line and these connecting branch lines for the parallel arrangement of the drying container, wherein in a throttle valve for each branch line inlet to the drying tank and one each assigned to this drying container Individual heating devices are installed and each drying container a temperature sensor is assigned, which is via a signal line with a control unit for adjusting the throttle valve connected is.
  • the known device improved according to the invention in that each individual heating device via a heating power signal line with the control unit for the throttle valve assigned to the same drying container connected is.
  • each Throttle valve in the individual heating device behind each Throttle valve arranged. This allows the individual heating device arrange close to the associated drying container, what the heat losses are reduced or the effort for insulation measures decreases. At the same time, the throttle valve is less heat stress.
  • the temperature sensors are each installed in the relevant drying container. In this way, reliable temperature values can be obtained achieve for the control of the device.
  • FIG. 1 An embodiment of a device according to the invention is explained in more detail below with the aid of a schematic drawing.
  • the only figure shows essentially one Top view of a device with two shown in side view Drying containers and with a drying air dryer.
  • the regeneration circuit 8 are one behind the other in the flow direction a suction filter 1, a regeneration blower 2, a Regeneration heater 3 and the two reversing valves 4a, 4b installed, between which two adsorption cells 5a, 5b are arranged are.
  • the two reversing valves 4a, 4b and the two adsorption cells 5a, 5b are also the drying cycle in the same way 9 assigned so that by reversing the reversing valves 4a, 4b the two adsorption cells 5a, 5b alternately in the Regeneration circuit 8 or switched on in the drying circuit 9 are.
  • the drying circuit 9 is with a blower 6 for the Drying air and provided with a filter 7 for the return air.
  • the drying circuit 9 includes a flow line 11 and a return line 12 for the circulating drying air and a first branch line with a branch line inlet 21 and a branch line outlet 28 and a second branch line with a branch line inlet 31 and a branch line outlet 38, each to the flow line 11 or to the return line 12 connected and through a first drying container 20 or a second drying container 30 with each other are connected.
  • the two drying containers 20 and 30 are used to dry granulate, which is known to and is dissipated, so that further explanations are not required are.
  • each branch line inlet 21, 31 contains one Throttle valve 22a, 32a and a single heater 23a, 33a.
  • the heating output is regulated so that the drying container 20, 30 supplied drying air if necessary the granulate to be dried has a set temperature.
  • a temperature sensor 23e, 33e arranged via a signal line 23d, 33d is connected to a control unit 23c, 33c, which the Heat supply through the heating line 23b, 33b to the individual heating device 23a, 33a controls.
  • the throttle valve 22a, 32a enables the air throughput to be adjusted to the granulate throughput through the drying container 20, 30 to in this optimal drying conditions (Drying temperatures). This is in the Drying container 20, 30 a temperature sensor 22e, 32e installed, the container temperature via a signal line 22d, 32d reports to a control unit 22c, 32c. This creates a Control signal for the throttle valve 22a, 32a, to this over a control line 22b, 32b is transmitted.
  • the control unit 23c, 33c for the heating power is via a signal line 24, 34 with the control unit 22c, 32c for the throttle valve 22a, 32a and supplies it with the heating power relevant data.
  • the granules filled in the drying containers 20, 30 at which are different materials with different materials Properties can be dealt with by the Drying circuit 9 by means of the blower 6 circulating drying air dried, for example by means of the adsorption cell 5b is continuously dehumidified.
  • the adsorption cell 5a in the regeneration circuit 8 arranged and is regenerated accordingly.
  • the reversing valves 4a, 4b switched, so that now the freshly regenerated adsorption cell 5a in the drying cycle 9 and the more or less exhausted adsorption cell 5b in Regeneration circuit 8 is and is now regenerated. This Switching between the adsorption cells 5a and 5b continues accordingly.
  • the drying containers 20, 30 individually supplied drying air in the individual heating devices 23b, 33b except for the one provided Target temperature heated.
  • 32e is determined temperature value the throttle valve 22a, 32a via the control unit 22c, 32c an optimal drying air throughput in the drying container concerned 20, 30 set.

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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

Each drying airflow supplied to a silo (20, 30) has its own heater (23a, 33a). Drying airflow is controlled both as a function of temperature and the respective heater power. On reaching a given heating power, the respective drying air flow is throttled back. This assures heating to a preselected desired temperature, independently of the drying air quantity distributed into the individual air flows. An Independent claim is included for the plant carrying out the process. A drying-air dryer (10), heater (23a, 33a), blower (6) and drying circuit (9) are employed. Flow- (11) and return- (12) lines have interconnecting branches (21, 28;31, 38) for each supply line (21, 31). Preferred features: Throttling of a drying air stream in accordance with heating power, is triggered when the relevant heater does not switch off within a given interval. In each branched line, the individual heater is located after the valve.

Description

Die Erfindung bezieht sich auf ein Verfahren zum Trocknen von Granulat in mindestens zwei Trocknungsbehältern mittels erwärmter Trocknungsluft, die durch die parallel geschalteten Trocknungsbehälter und durch einen Trocknungslufttrockner umgewälzt wird, wobei jeder einem Trocknungsbehälter zugeführte Trocknungsluftstrom mit einer diesem Trocknungbehälter zugeordneten Einzelheizeinrichtung erwärmt wird und der dem einzelnen Trocknungsbehälter zugeführte Trocknungsluftstrom jeweils in Abhängigkeit von einer die momentanen Verhältnisse im betreffenden Trocknungsbehälter widerspiegelnden Temperatur mehr oder minder gedrosselt wird.The invention relates to a method for drying Granules in at least two drying containers using heated Drying air through the drying container connected in parallel and circulated through a drying air dryer , each drying air stream supplied to a drying tank with one assigned to this drying container Individual heating device is heated and the individual drying container supplied drying air flow depending on one of the current conditions in the concerned Drying container reflecting temperature more or less is throttled.

Ein derartiges Verfahren ist aus EP 61 161 A bekannt. Dort sind drei parallel geschaltete Trocknungsbehälter vorgesehen, in deren Zweigleitungszulauf jeweils eine Drosselklappe vor dem Trocknungsbehälter eingebaut ist, die über einen Stellmotor in Abhängigkeit vom Signal eines Temperaturfühlers betätigt wird, der im Zweigleitungsablauf hinter dem Trocknungsbehälter angeordnet ist. Der Trocknungslufttrockner weist Adsorbtionszellen auf, durch die im Wechsel die umgewälzte Trocknungsluft und ein Regenerationsmittel (Heißluft) durchgeleitet werden. Allerdings ist nur eine einzige gemeinsame Heizeinrichtung vorgesehen und am Ausgang des Trocknungslufttrockners wird die Trocknungsluft durch die einzige Heizeinrichtung geleitet, bevor sie in die Vorlaufleitung zu den Trocknungsbehältern eintritt.Such a method is known from EP 61 161 A. There are three drying containers connected in parallel are provided, in their Branch line inlet one throttle each before Drying container is installed, which is controlled by an actuator Depending on the signal from a temperature sensor, which is arranged in the branch line outlet behind the drying container is. The drying air dryer has adsorption cells on, through which the circulating drying air and a Regeneration agents (hot air) are passed through. Indeed only one common heating device is provided and at the exit of the drying air dryer is the drying air passed through the only heater before entering the Flow line to the drying containers enters.

Aus DE 42 34 696 A ist es bereits bekannt, bei einer Anlage mit zwei parallel geschalteten Trocknungsbehältern zusätzlich zur gemeinsamen Heizeinrichtung Zusatzheizungen vorzusehen, die jeweils nur einem Trocknungsbehälter zugeordnet und in dessen Zulaufleitung eingebaut sind. Diese Zusatzheizungen werden jeweils in Abhängigkeit von der Temperatur des zu trocknenden Gutes am unteren Ausgang des Trocknungsbehälters zugeschaltet bzw. abgeschaltet. Ferner läßt sich der Trocknungsluftdurchsatz durch die Zuleitungen zu den Trocknungsbehältern nicht drosseln sondern nur ganz absperren bzw. freigeben, und zwar in Abhängigkeit von der Temperatur des zu trocknenden Gutes am oberen Ende des betreffenden Trocknungsbehälters. Hier führt das Nebeneinander von Gesamtheizeinrichtung und Zusatzheizungen zu einem unerwünschten Mehraufwand. Ferner ist es nachteilig, daß sich der Trocknungsluftdurchsatz zu den einzelnen Trocknungsbehältern nicht den jeweiligen Gegebenheiten anpassen läßt.From DE 42 34 696 A it is already known to use in a system two drying containers connected in parallel to the common heating device to provide additional heaters only assigned to one drying container and in it Inlet line are installed. These additional heaters are each depending on the temperature of the to be dried Good things switched on at the lower outlet of the drying container or switched off. Furthermore, the drying air throughput can be do not throttle through the supply lines to the drying containers but only completely shut off or release, depending on the situation on the temperature of the material to be dried at the top End of the drying container in question. Here the coexistence leads of the entire heating device and additional heaters an undesirable additional effort. It is also disadvantageous that the drying air throughput to the individual drying containers cannot be adapted to the respective circumstances.

Aus DE 296 21 313 U ist das eingangs beschriebene Verfahren bekannt. Die dort beschriebene Trocknungsanlage weist drei parallel geschaltete Trocknungsbehälter auf, denen jeweils eine Einzelheizeinrichtung und eine Drosseleinrichtung für die dem betreffenden Trocknungsbehälter zugeführte Trocknungsluft zugeordnet sind. Somit ist es möglich, die Trocknungsbehälter mit Trocknungsluft von unterschiedlicher Temperatur zu beschicken, was beispielsweise dann zweckmäßig ist, wenn in den einzelnen Trocknungsbehältern verschiedene Materialien getrocknet werden sollen, die wegen abweichender Temperaturempfindlichkeit bei unterschiedlichen Temperaturen getrocknet werden sollten. Da jedoch die Luftmengenverteilung auf die einzelnen Trocknungsbehälter durch das Ausmaß der Drosselung der den einzelnen Trocknungsbehältern zugeführten Trocknungsluftströme bestimmt wird, kann sich die Situation ergeben, daß eine der Einzelheizeinrichtungen übermäßig stark mit einem hohen Trocknungsluftdurchsatz beansprucht wird, so daß die vorgesehene Aufheiztemperatur der Trocknungsluft eventuell nicht mehr erreicht wird. Um die Sollwerttemperatur bei allen Betriebszuständen einhalten zu können, müssen daher in nachteiliger Weise übermäßig leistungsstarke und somit aufwändige Einzelheizeinrichtungen eingesetzt werden.The method described at the outset is known from DE 296 21 313 U. The drying system described there has three in parallel switched on drying containers, each with a single heating device and a throttle device for that Drying container supplied drying air assigned are. It is therefore possible to use the drying container To feed drying air of different temperatures, which is useful, for example, if in the individual Drying containers can be dried different materials should, because of different temperature sensitivity different temperatures should be dried. There however, the air volume distribution over the individual drying containers by the extent of the throttling of the individual drying containers supplied drying air flows is determined, the situation may arise that one of the individual heating devices excessively strong with a high drying air flow is claimed so that the intended heating temperature the drying air may no longer be reached. To the Maintain the setpoint temperature in all operating states may need to be over-performing disadvantageously and thus complex individual heating devices are used become.

Dementsprechend liegt der Erfindung die Aufgabe zugrunde das bekannte Verfahren so zu verbessern, daß für die einzelnen Trocknungsbehälter Trocknungsluft unterschiedlich hoher Temperatur zur Verfügung gestellt werden kann und die Solltemperaturen der verschiedenen Trocknungsluftströme unter allen Betriebsbedingungen erreicht werden, ohne daß dazu übermäßig leistungsstarke Heizeinrichtungen verwendet werden müssen.Accordingly, the invention is based on the object to improve known methods so that for the individual Drying container drying air of different temperatures can be provided and the target temperatures of the various drying air flows under all operating conditions can be achieved without being overly powerful Heaters must be used.

Diese Aufgabe wird bei einem Verfahren der eingangs genannten Art erfindungsgemäß dadurch gelöst, daß die Trocknungsluftströme nicht nur temperaturabhängig sondern auch in Abhängigkeit von der jeweiligen Heizleistung der betreffenden Einzelheizeinrichtung derart gesteuert werden, daß bei Erreichen einer vorbestimmten Heizleistung der Einzelheizeinrichtung der betreffende Trocknungsluftstrom zusätzlich gedrosselt wird, so daß seine Aufheizung auf eine vorgewählte Solltemperatur unabhängig von der Trocknungsluftmengenverteilung auf die einzelnen Trocknungsluftströme gewährleistet ist.This task is carried out in a method of the type mentioned at the beginning Art solved according to the invention in that the drying air flows not only temperature-dependent but also dependent of the respective heating output of the individual heating device in question be controlled so that when reaching predetermined heating power of the individual heater relevant drying air flow is additionally throttled, so that its heating to a preselected target temperature is independent from the distribution of drying air to the individual Drying air flows is guaranteed.

Das Vorsehen der Einzelheizeinrichtungen schafft die Möglichkeit, die verschiedenen Trocknungsbehältern zugeleiteten Trocknungsluftströme den jeweiligen Anforderungen entsprechend auf unterschiedliche Temperaturen zu erwärmen. Wird die Kapazität einer Einzelheizeinrichtung überschritten, weil der betreffende Trocknungsluftstrom infolge einer starken Drosselung der anderen Trocknungsluftströme stark ansteigt und/oder für den betreffenden Trocknungsluftstrom eine vergleichsweise hohe Solltemperatur vorgegeben ist, so erfährt der betreffende Trocknungsluftstrom eine Drosselung, bis das Verhältnis des Trocknungsluftdurchsatzes zur verfügbaren Heizleistung wieder ausreicht, um die Solltemperatur zu erzielen. Daher kann auf überdimensionierte Einzelheizeinrichtungen verzichtet werden, ohne daß die Gefahr besteht, daß unter extremen Betriebsbedingungen an einem der Trocknungsbehälter die Solltemperatur der Trocknungsluft nicht erreicht wird.The provision of the individual heating devices creates the possibility the drying air flows supplied to the various drying containers according to the respective requirements to heat different temperatures. Will the capacity of a single heater because the concerned Drying air flow due to severe throttling of the others Drying air flows increases sharply and / or for the person concerned Drying air flow a comparatively high target temperature is specified, the drying air flow concerned experiences throttling until the ratio of drying air flow sufficient for the available heating capacity, to achieve the target temperature. Therefore, oversized Individual heating devices can be dispensed with without that there is a risk that under extreme operating conditions the target temperature of the drying air on one of the drying tanks is not reached.

Das erfindungsgemäße Verfahren wird bei Verwendung von bedarfsabhängig selbsttätig an- und abschaltbaren Einzelheizeinrichtungen zweckmäßigerweise so durchgeführt, daß die heizleistungsabhängige Zusatzdrosselung eines Trocknungsluftstroms dann ausgelöst wird, wenn die betreffende Einzelheizeinrichtung innerhalb einer vorbestimmten Zeitspanne nicht abschaltet. Der während der Zeitspanne festgestellte Dauerbetrieb der Einzelheizeinrichtung wird dabei in dem Sinne gewertet, daß die Heizleistung nicht ausreicht, um beim momentanen Trocknungsluftdurchsatz die Solltemperatur zu erreichen.The method according to the invention becomes dependent on the use of Individual heating devices that can be switched on and off automatically Conveniently carried out so that the heat output dependent Additional throttling of a drying air flow is triggered when the individual heating device in question does not turn off within a predetermined period of time. The continuous operation of the individual heating device ascertained during the period is evaluated in the sense that the heating power not sufficient for the current drying air throughput to reach the target temperature.

Die Erfindung bezieht sich auch auf eine Vorrichtung zum Durchführen des erfindungsgemäßen Verfahrens mit mindestens zwei Trocknungsbehältern und einem Trocknungslufttrockner, die in einen ein Gebläse aufweisenden Trocknungskreislauf für Trocknungsluft eingebaut sind, der eine Vorlaufleitung und eine Rücklaufleitung und diese verbindende Zweigleitungen für die parallele Anordnung der Trocknungsbehälter aufweist, wobei in jedem Zweigleitungszulauf zum Trocknungsbehälter eine Drosselklappe und eine jeweils diesem Trocknungsbehälter zugeordnete Einzelheizeinrichtung eingebaut sind und jedem Trocknungsbehälter ein Temperaturfühler zugeordnet ist, der über eine Signalleitung mit einem Steuergerät zur Verstellung der Drosselklappe verbunden ist.The invention also relates to a device for performing of the method according to the invention with at least two Drying containers and a drying air dryer, which in a drying circuit for drying air having a blower are installed, the one flow line and one Return line and these connecting branch lines for the parallel arrangement of the drying container, wherein in a throttle valve for each branch line inlet to the drying tank and one each assigned to this drying container Individual heating devices are installed and each drying container a temperature sensor is assigned, which is via a signal line with a control unit for adjusting the throttle valve connected is.

Eine solche Vorrichtung ist gleichfalls aus EP 61 161 A bekannt. Ihr haften in entsprechender Weise die vorgenannten Nachteile an.Such a device is also known from EP 61 161 A. You are liable in a corresponding manner for the aforementioned Disadvantages.

Um diesen Nachteilen zu begegnen, ist die bekannte Vorrichtung erfindungsgemäß dadurch verbessert, daß jede Einzelheizeinrichtung über eine Heizleistungs-Signalleitung mit dem Steuergerät für die demselben Trocknungsbehälter zugeordnete Drosselklappe verbunden ist.To overcome these disadvantages, the known device improved according to the invention in that each individual heating device via a heating power signal line with the control unit for the throttle valve assigned to the same drying container connected is.

Mit der in dieser Weise ausgebildeten Vorrichtung lassen sich das vorbeschriebene erfindungsgemäße Verfahren betreiben und somit auch die entsprechenden Vorteile erzielen.With the device designed in this way, operate the above-described method according to the invention and thus also achieve the corresponding advantages.

Bei einer vorteilhaften Ausgestaltung der Vorrichtung ist in jeder Zulaufzweigleitung die Einzelheizeinrichtung hinter der Drosselklappe angeordnet. Dadurch läßt sich die Einzelheizeinrichtung nahe beim zugehörigen Trocknungsbehälter anordnen, was die Wärmeverluste vermindert bzw. den Aufwand für Isolierungsmaßnahmen herabsetzt. Zugleich ist die Drosselklappe weniger wärmebelastet. Bei einer anderen zweckmäßigen Ausgestaltung sind die Temperaturfühler jeweils in den betreffenden Trocknungsbehälter eingebaut. Auf diese Weise lassen sich zuverlässige Temperaturwerte für die Steuerung der Vorrichtung erzielen.In an advantageous embodiment of the device, in the individual heating device behind each Throttle valve arranged. This allows the individual heating device arrange close to the associated drying container, what the heat losses are reduced or the effort for insulation measures decreases. At the same time, the throttle valve is less heat stress. In another expedient embodiment, the temperature sensors are each installed in the relevant drying container. In this way, reliable temperature values can be obtained achieve for the control of the device.

Ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung wird nachfolgend anhand einer schematischen Zeichnung näher erläutert. Die einzige Figur zeigt im wesentlichen in einer Draufsicht eine Vorrichtung mit zwei in Seitenansicht dargestellten Trocknungsbehältern und mit einem Trocknungslufttrockner.An embodiment of a device according to the invention is explained in more detail below with the aid of a schematic drawing. The only figure shows essentially one Top view of a device with two shown in side view Drying containers and with a drying air dryer.

In der Zeichnung sind ein Regenerationskreislauf 8 und ein Trocknungskreislauf 9 dargestellt, die innerhalb eines Trocknungslufttrockners 10 zusammengeführt sind.In the drawing, a regeneration circuit 8 and a Drying circuit 9 shown within a drying air dryer 10 are merged.

In den Regenerationskreislauf 8 sind in Strömungsrichtung hintereinander ein Ansaugfilter 1, ein Regeneriergebläse 2, eine Regenerierheizung 3 und die beiden Umsteuerventile 4a, 4b eingebaut, zwischen denen zwei Adsorbtionszellen 5a, 5b angeordnet sind.In the regeneration circuit 8 are one behind the other in the flow direction a suction filter 1, a regeneration blower 2, a Regeneration heater 3 and the two reversing valves 4a, 4b installed, between which two adsorption cells 5a, 5b are arranged are.

Die beiden Umsteuerventile 4a, 4b und die beiden Adsorptionszellen 5a, 5b sind in gleicher Weise auch dem Trocknungskreislauf 9 zugeordnet, sodaß durch Umsteuerung der Umsteuerventile 4a, 4b die beiden Adsorbtionszellen 5a, 5b im Wechsel in den Regenerationskreislauf 8 bzw. in den Trocknungskreislauf 9 eingeschaltet sind.The two reversing valves 4a, 4b and the two adsorption cells 5a, 5b are also the drying cycle in the same way 9 assigned so that by reversing the reversing valves 4a, 4b the two adsorption cells 5a, 5b alternately in the Regeneration circuit 8 or switched on in the drying circuit 9 are.

Der Trocknungskreislauf 9 ist mit einem Gebläse 6 für die Trocknungsluft und mit einem Filter 7 für die Rücklauf luft versehen.The drying circuit 9 is with a blower 6 for the Drying air and provided with a filter 7 for the return air.

Zum Trocknungskreislauf 9 gehören eine Vorlaufleitung 11 und eine Rücklaufleitung 12 für die umgewälzte Trocknungsluft sowie eine erste Zweigleitung mit einem Zweigleitungszulauf 21 und einem Zweigleitungsablauf 28 und eine zweite Zweigleitung mit einem Zweigleitungszulauf 31 und einem Zweigleitungsablauf 38, die jeweils an die Vorlaufleitung 11 bzw. an die Rücklaufleitung 12 angeschlossen und durch einen ersten Trocknungsbehälter 20 bzw. einen zweiten Trocknungsbehälter 30 hindurch miteinander verbunden sind. Die beiden Trocknungsbehälter 20 und 30 dienen der Trocknung von Granulat, das in bekannter Weise zuund abgeführt wird, so daß nähere Erläuterungen dazu nicht erforderlich sind.The drying circuit 9 includes a flow line 11 and a return line 12 for the circulating drying air and a first branch line with a branch line inlet 21 and a branch line outlet 28 and a second branch line with a branch line inlet 31 and a branch line outlet 38, each to the flow line 11 or to the return line 12 connected and through a first drying container 20 or a second drying container 30 with each other are connected. The two drying containers 20 and 30 are used to dry granulate, which is known to and is dissipated, so that further explanations are not required are.

Die beiden Trocknungsbehälter 20, 30 sind - wie die Zeichnung deutlich macht - in gleicher Weise ausgebildet, und die ihnen zugeordneten Vorrichtungsteile sind ebenfalls in gleicher Weise ausgebildet. so enthält jeder Zweigleitungszulauf 21, 31 eine Drosselklappe 22a, 32a und eine Einzelheizeinrichtung 23a, 33a. Die Heizleistung wird so geregelt, daß die dem Trocknungsbehälter 20, 30 zugeführte Trocknungsluft eine gegebenenfalls auf das zu trocknende Granulat abgestimmte Solltemperatur aufweist. Dazu ist im Zweigleitungszulauf 21, 31 zwischen der Einzelheizeinrichtung 23a, 33a und dem Trocknungsbehälter 20, 30 ein Temperaturfühler 23e, 33e angeordnet, der über eine Signalleitung 23d, 33d mit einem Steuergerät 23c, 33c verbunden ist, das die Wärmezufuhr durch die Heizleitung 23b, 33b zur Einzelheizeinrichtung 23a, 33a steuert.The two drying containers 20, 30 are - like the drawing makes clear - trained in the same way, and that to them assigned device parts are also in the same way educated. each branch line inlet 21, 31 contains one Throttle valve 22a, 32a and a single heater 23a, 33a. The heating output is regulated so that the drying container 20, 30 supplied drying air if necessary the granulate to be dried has a set temperature. For this purpose, in the branch line inlet 21, 31 between the individual heating device 23a, 33a and the drying container 20, 30 a temperature sensor 23e, 33e arranged via a signal line 23d, 33d is connected to a control unit 23c, 33c, which the Heat supply through the heating line 23b, 33b to the individual heating device 23a, 33a controls.

Die Drosselklappe 22a, 32a ermöglicht eine Anpassung des Luftdurchsatzes an den Granulatdurchsatz durch den Trocknungsbehälter 20, 30, um in diesem optimale Trocknungsbedingungen (Trocknungstemperaturen) aufrecht zu erhalten. Dazu ist in den Trocknungsbehälter 20, 30 ein Temperaturfühler 22e, 32e einge-baut, der über eine Signalleitung 22d, 32d die Behältertemperatur an ein Steuergerät 22c, 32c meldet. Dieses erzeugt ein Stellsignal für die Drosselklappe 22a, 32a, das zu dieser über eine Steuerleitung 22b, 32b übertragen wird.The throttle valve 22a, 32a enables the air throughput to be adjusted to the granulate throughput through the drying container 20, 30 to in this optimal drying conditions (Drying temperatures). This is in the Drying container 20, 30 a temperature sensor 22e, 32e installed, the container temperature via a signal line 22d, 32d reports to a control unit 22c, 32c. This creates a Control signal for the throttle valve 22a, 32a, to this over a control line 22b, 32b is transmitted.

Das Steuergerät 23c, 33c für die Heizleistung ist über eine Signalleitung 24, 34 mit dem Steuergerät 22c, 32c für die Drosselklappe 22a, 32a verbunden und liefert diesem die Heizleistung betreffende Daten. The control unit 23c, 33c for the heating power is via a signal line 24, 34 with the control unit 22c, 32c for the throttle valve 22a, 32a and supplies it with the heating power relevant data.

Die dargestellte und beschriebene Vorrichtung arbeitet wie folgt:The device shown and described works like follows:

Das in die Trocknungsbehälter 20, 30 eingefüllte Granulat, bei dem es sich jeweils um verschiedene Materialien mit unterschiedlichen Eigenschaften handeln kann, wird mit der durch den Trocknungskreislauf 9 mittels des Gebläses 6 umgewälzten Trocknungsluft getrocknet, die beispielsweise mittels der Adsorbtionszelle 5b laufend entfeuchtet wird. Während dieser Betriebsphase ist die Adsorptionszelle 5a im Regenerationskreislauf 8 angeordnet und wird dementsprechend regeneriert. Nach einer vorbestimmten Betriebsdauer und insbesondere rechtzeitig vor einer vollständigen Erschöpfung der Adsorbtionszelle 5b werden die Umsteuerventile 4a, 4b umgeschaltet, so daß jetzt die frisch regenerierte Adsorbtionszelle 5a im Trocknungskreislauf 9 und die mehr oder minder erschöpfte Adsorbtionszelle 5b im Regenerationskreislauf 8 liegt und nun regeneriert wird. Diese Umschaltung zwischen den Adsorbtionszellen 5a und 5b setzt sich entsprechend fort.The granules filled in the drying containers 20, 30 at which are different materials with different materials Properties can be dealt with by the Drying circuit 9 by means of the blower 6 circulating drying air dried, for example by means of the adsorption cell 5b is continuously dehumidified. During this operating phase is the adsorption cell 5a in the regeneration circuit 8 arranged and is regenerated accordingly. After a predetermined operating time and in particular in good time a complete exhaustion of the adsorption cell 5b the reversing valves 4a, 4b switched, so that now the freshly regenerated adsorption cell 5a in the drying cycle 9 and the more or less exhausted adsorption cell 5b in Regeneration circuit 8 is and is now regenerated. This Switching between the adsorption cells 5a and 5b continues accordingly.

Während des Trocknungsbetriebs wird die den Trocknungsbehältern 20, 30 zugeführte Trocknungsluft individuell in den Einzelheizeinrichtungen 23b, 33b bis auf die jeweils vorgesehene Solltemperatur aufgeheizt. In Abhängigkeit vom durch den Temperaturfühler 22e, 32e festgestellten Temperaturwert wird über das Steuergerät 22c, 32c die Drosselklappe 22a, 32a auf einen optimalen Trocknungsluftdurchsatz im betreffenden Trocknungsbehälter 20, 30 eingestellt.During the drying operation, the drying containers 20, 30 individually supplied drying air in the individual heating devices 23b, 33b except for the one provided Target temperature heated. Depending on the through the Temperature sensor 22e, 32e is determined temperature value the throttle valve 22a, 32a via the control unit 22c, 32c an optimal drying air throughput in the drying container concerned 20, 30 set.

Da jedoch das Schließen einer Drosselklappe 22a oder 32a nicht nur den Trocknungsluftdurchsatz durch den zugeordneten Trocknungsbehälter 20 oder 30 herabsetzt sondern auch zu einer Erhöhung des Trocknungsluftdurchsatzes durch die andere Zweigleitung mit der Drosselklappe 32a bzw. 22a und durch den betreffenden Trocknungsbehälter 30 bzw. 20 führt, kann es dort zu einem übermäßigen Trocknungsluftdurchsatz kommen, bei dem die zugeordnete Einzelheizeinrichtung 33a bzw. 23a wegen begrenzter Heizkapazität nicht mehr in der Lage ist, eine Aufheizung bis auf die Solltemperatur zu erreichen. Ein solcher Zustand, der durch den Dauerbetrieb (Volllast) der Einzelheizeinrichtung 23a, 33a gekennzeichnet ist, wird dem Steuergerät 22c, 32c über die Heizleistungs-Signalleitung 24, 34 mitgeteilt, was eine zusätzliche Drosselung der Trocknungsluft in der überlasteten Zweigleitung auslöst, so daß die Temperatur der Trocknungsluft wieder bis auf den Sollwert ansteigt.However, since the closing of a throttle valve 22a or 32a does not only the drying air throughput through the assigned drying container 20 or 30 reduced but also to an increase the drying air throughput through the other branch line with the throttle valve 32a and 22a and through the leads drying container 30 or 20, it can there lead to excessive drying air throughput, in which the associated individual heating device 33a or 23a because of limited Heating capacity is no longer able to heat up to reach the target temperature. Such a state by continuous operation (full load) of the individual heating device 23a, 33a, the control unit 22c, 32c communicated via the heating power signal line 24, 34 what an additional throttling of the drying air in the overloaded Branch line triggers so that the temperature of the drying air increases again to the setpoint.

Vorstehend ist ausgeführt, daß durch den Trocknungskreislauf 9 Luft umgewälzt wird. Das ist nicht einschränkend zu verstehen, denn anstelle von Luft können auch andere Gase wie beispielsweise Stickstoff im Trocknungskreislauf 9 eingesetzt und durch die Trocknungsbehälter umgewälzt werden.It is stated above that through the drying circuit 9th Air is circulated. This is not to be understood as limiting because instead of air, other gases such as Nitrogen used in the drying circuit 9 and through the drying containers are circulated.

Claims (4)

  1. Method of drying granulate in at least two drying containers (20, 30) by means of heated drying air, which is circulated through the drying containers, which are connected in parallel, (20, 30) and through a drying air drier (10), wherein each drying air flow fed to a drying container (20, 30) is heated by an individual heating device (23a, 33a), which is associated with this drying container (20 or 30), and the drying air flow fed to the individual drying containers (20, 30) is throttled in each instance to greater or lesser extent in dependence on a temperature reflecting the instantaneous conditions in the relevant drying container (20, 30), characterised in that the drying air flows are controlled not only temperature-dependently, but also in dependence on the respective heat output of the relevant individual heating device (23a, 33a) in such a manner that on attainment of a predetermined heat output of the individual heating device (23a, 33a) the respective drying air flow is additionally throttled so that the heating up thereof to a preselected target temperature is guaranteed independently of the drying air quantity distribution to the individual drying air flows.
  2. Method according to claim 1 with individual heating devices (23a, 33a) able to be automatically switched on and off depending on need, characterised in that the additional throttling of a drying air flow in dependence on heat output is triggered when the respective individual heating device (23a, 33a) is not switched off within a predetermined time period.
  3. Device for carrying out the method according to claim 1 or 2 with at least two drying containers (20, 30) and a drying air drier (10), which are installed in a drying circuit (9), which has a fan (6), for drying air, the drying circuit having a forward duct (11) and a return duct (12) and branch ducts (21, 28; 31, 38) connecting these for the parallel arrangement of the drying containers (20, 30), wherein a throttle flap (22a, 32a) and an individual heating device (23a, 33a), which is associated with a respective one of these drying containers (20, 30), are incorporated in each branch duct feed (21, 31) to the drying container (20, 30) and each drying container (20, 30) is associated with a temperature sensor (22e, 32e) which is connected by way of a signal line (22d, 32d) with control apparatus (22c, 32c) for adjusting the throttle flap (22a, 32a), characterised in that each individual heating device (23a, 33a) is connected by way of a heat output signal line (24, 34) with the control apparatus (22c, 32c) for the throttle flap (22a, 32a) associated with the same drying container (20, 30).
  4. Device according to claim 3, characterised in that in each feed branch duct (21, 31) the individual heating device (23a, 33a) is arranged behind the throttle flap (22a, 32a).
EP00112648A 1999-07-07 2000-06-15 Process and apparatus for drying granulate Expired - Lifetime EP1067348B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19931357A DE19931357C1 (en) 1999-07-07 1999-07-07 Method and device for drying granules
DE19931357 1999-07-07

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EP1067348A1 EP1067348A1 (en) 2001-01-10
EP1067348B1 true EP1067348B1 (en) 2003-08-20

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EP (1) EP1067348B1 (en)
AT (1) ATE247812T1 (en)
BR (1) BR0002304A (en)
CA (1) CA2312511A1 (en)
DE (2) DE19931357C1 (en)
ES (1) ES2204403T3 (en)
MX (1) MXPA00006721A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006049437B3 (en) * 2006-10-16 2008-03-27 Lanco Gmbh Hot air drying equipment for bulk materials, especially plastic granules, includes valves controlling air flow recirculated between drying chamber and drying agent chamber
EP2020581A1 (en) * 2007-08-03 2009-02-04 Moretto S.P.A. Plant and process for the controlled dehumidification of granular material
DE102015005822A1 (en) * 2015-05-05 2016-11-10 Zbk Zentrum Für Baukeramik Gmbh Plant and process for drying ceramic raw materials or blanks
DE102015116876A1 (en) * 2015-10-05 2017-04-06 Zbk Zentrum Für Baukeramik Gmbh Plant and method for drying ceramic raw materials and blanks
CN106903987A (en) * 2017-03-13 2017-06-30 广州黑马科技有限公司 Intaglio press air circulation system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
GB2122384A (en) * 1982-06-14 1984-01-11 Conair Plastics material drying cycle
DE4037443A1 (en) * 1990-11-24 1992-05-27 Mann & Hummel Filter DEVICE FOR DRYING SCHUETTGUT
DE4234696C2 (en) * 1991-10-14 1994-06-09 Werner Koch Device for drying plastic bulk goods
DE4321895A1 (en) * 1993-07-01 1995-01-12 Holger Achelpohl Process and apparatus for drying bulk material, preferably plastics granules (pellets)
DE4321863C2 (en) * 1993-07-01 2000-01-05 Behr Gmbh & Co Method and device for desorbing a moisture adsorbing material
DE29621313U1 (en) * 1996-12-07 1997-01-30 digicolor GmbH, 33609 Bielefeld Device for drying granules

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DE19931357C1 (en) 2001-04-05
DE50003340D1 (en) 2003-09-25
CA2312511A1 (en) 2001-01-07
ATE247812T1 (en) 2003-09-15
ES2204403T3 (en) 2004-05-01
MXPA00006721A (en) 2005-04-01
EP1067348A1 (en) 2001-01-10
BR0002304A (en) 2001-03-13

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