EP0092777A2 - Process and apparatus for carrying out the process for loading and unloading the receptacles of a drying cupboard - Google Patents

Process and apparatus for carrying out the process for loading and unloading the receptacles of a drying cupboard Download PDF

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Publication number
EP0092777A2
EP0092777A2 EP83103817A EP83103817A EP0092777A2 EP 0092777 A2 EP0092777 A2 EP 0092777A2 EP 83103817 A EP83103817 A EP 83103817A EP 83103817 A EP83103817 A EP 83103817A EP 0092777 A2 EP0092777 A2 EP 0092777A2
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EP
European Patent Office
Prior art keywords
drying
trays
filling space
solvent
filling
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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
Application number
EP83103817A
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German (de)
French (fr)
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EP0092777B1 (en
EP0092777A3 (en
Inventor
Fritz Ing. Laemmermann (Grad.)
Werner Rindfleisch
Wolfgang Dr. Fabian
Rudolf Dr. Polster
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BASF SE
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BASF SE
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Publication of EP0092777A3 publication Critical patent/EP0092777A3/en
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Publication of EP0092777B1 publication Critical patent/EP0092777B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001—Handling, e.g. loading or unloading arrangements
    • F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/041—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying flowable materials, e.g. suspensions, bulk goods, in a continuous operation, e.g. with locks or other air tight arrangements for charging/discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/044—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying materials in a batch operation in an enclosure having a plurality of shelves which may be heated

Definitions

  • the invention relates to a method for loading and emptying the drying trays of a drying cabinet with solvent-moist, pumpable starting products and pneumatically conveyable end products, the drying being carried out by heating the starting product by means of radiation, convection or contact, and an arrangement of working means for carrying out the method.
  • drying trays of a commercially available vacuum drying cabinet with solvent-moist, pumpable starting products in compliance with the guidelines for explosion protection and the guidelines for the MAK values is only possible with great technical effort, e.g. filling in a separate room with sufficient ventilation and additional Wear breathing apparatus.
  • the drying trays are usually emptied by tipping over the individual drying trays or the entire drying tray package in a tipping device, which leads to dust nuisance for various products.
  • the filling and emptying of the dry trays represent two complex and therefore cost-intensive process steps.
  • the invention is therefore based on the object to develop a simple method for loading and emptying the drying trays with solvent-moist, pumpable starting products and pneumatically conveyable end products in compliance with the guidelines for explosion protection and the guidelines for the MAK values and at the same time the costs of Reduce process.
  • paste is conveyed from the storage container 1 by means of the pump 2 via a flexible connection 3 into the drying trays 4 of the vacuum drying cabinet 5.
  • the filling space is shown in FIG. 2 provides - by lowering the heating plates 6 or lifting the drying trays 4. Due to the size and number of piston strokes of the pump 2, the filling space volume corresponding to a drying bowl can be pumped into the drying bowl 4. This ensures uniform filling of all drying trays 4. After all the drying trays 4 have been filled and the vacuum drying cabinet 5 has been closed, the latter is evacuated by means of a vacuum station 7. During the evacuation, the heating plates 6 are raised, as shown in FIG. 3, or the drying trays 4 are lowered. The heat supply for the evaporation of the solvent takes place via the heating plates 6.
  • the solvent vapors are condensed or desublimated on the tubes 9 of the heat exchanger 8, depending on the type of drying, cooling water 10 or brine 11 are flowed through at a low temperature.
  • the filling chamber is closed again by lowering the heating plates 6 or lifting the drying trays 4 and the vacuum drying cabinet 5 is ventilated to normal pressure.
  • the paste originally present in the drying trays 4 is converted into a pneumatically conveyable end product by the described method.
  • the flap 12 is opened and the end product is sucked off by means of a fan 14 and collected in the end product container 15.
  • the entrained fine dust is separated in an interposed filter 16.
  • the front side 4a of the drying trays 4 is folded up - as shown in FIG. 4 - thereby exposing a ventilation slot the width of the drying trays 4.
  • the condensate or S ubli- can mat in the heat exchanger 8 and pumped and pumped defrosted will.
  • the proportion of dust that arises during drying collects on the bottom of the vacuum drying cabinet 5 and can be suctioned off after the flap 13 has been opened.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Verfahren und Anordnung zur Durchführung des Verfahrens zum Beschicken und Entleeren der Trockenschalen eines Trockenschrankes mit lösungsmittelfeuchten, pumpbaren Ausgangsprodukten und pneumatisch förderbaren Endprodukten, bei dem die Trockenschalen zum Befüllen mit einer Abdeckplatte verschlossen werden, in den so gebildeten Füllraum die lösungsmittelfeuchten Ausgangsprodukte gepumpt werden, zu Beginn der Trocknung der Füllraum geöffnet wird, nach Beendigung der Trocknung der Füllraum wieder geschlossen wird und anschließend die Endprodukte aus dem Füllraum pneumatisch weggefördert werden. Mittels dieses Verfahrens ist es möglich, Trockenschränke auch zur Trocknung lösungsmittelfeuchter, pumpbarer Produkte einzusetzen, wobei die Richtlinien für den Ex-Schutz und die Richtlinien für die MAK-Werte eingehalten werden und gleichzeitig das Befüllen und Entleeren der Trockenschränke maschinell - und damit billiger - ausgeführt wird.Method and arrangement for carrying out the method for loading and emptying the drying trays of a drying cabinet with solvent-moist, pumpable starting products and pneumatically conveyable end products, in which the drying trays are closed with a cover plate for filling, the solvent-moist starting products are pumped into the filling space thus formed, at the beginning the drying of the filling space is opened, after the drying the filling space is closed again and then the end products are pneumatically conveyed away from the filling space. Using this process, it is possible to use drying ovens for drying solvent-moist, pumpable products, while adhering to the guidelines for explosion protection and the guidelines for the MAK values, while simultaneously filling and emptying the drying cabinets mechanically - and therefore cheaper becomes.

Description

Die Erfindung betrifft ein Verfahren zum Beschicken und Entleeren der Trockenschalen eines Trockenschrankes mit lösungsmittelfeuchten, pumpbaren Ausgangsprodukten und pneumatisch förderbaren Endprodukten, wobei die Trocknung durch Beheizung des Ausgangsproduktes mittels Strahlung, Konvektion oder Kontakt vorgenommen wird, sowie eine Anordnung von Arbeitsmitteln zur Durchführung des Verfahrens.The invention relates to a method for loading and emptying the drying trays of a drying cabinet with solvent-moist, pumpable starting products and pneumatically conveyable end products, the drying being carried out by heating the starting product by means of radiation, convection or contact, and an arrangement of working means for carrying out the method.

Das Befüllen der Trockenschalen eines handelsüblichen Vakuum-Trockenschranks mit lösungsmittelfeuchten, pumpbaren Ausgangsprodukten unter Einhaltung der Richtlinien für den Ex-Schutz und der Richtlinien für die MAK-Werte ist nur mit großem technischen Aufwand möglich, beispielsweise Befüllen in einem gesonderten Raum mit ausreichender Belüftung und zusätzlichem Tragen von Atemschutzgeräten. Das Entleeren der Trockenschalen erfolgt in der Regel durch Umkippen der einzelnen Trockenschalen oder des gesamten Trockenschalenpaketes in einer Umkippvorrichtung, was bei verschiedenen Produkten zu Staubbelästigungen führt. Ferner stellen das Befüllen und Entleeren der Trockenschalen zwei aufwendige und damit lohnintensive Verfahrensschritte dar.Filling the drying trays of a commercially available vacuum drying cabinet with solvent-moist, pumpable starting products in compliance with the guidelines for explosion protection and the guidelines for the MAK values is only possible with great technical effort, e.g. filling in a separate room with sufficient ventilation and additional Wear breathing apparatus. The drying trays are usually emptied by tipping over the individual drying trays or the entire drying tray package in a tipping device, which leads to dust nuisance for various products. Furthermore, the filling and emptying of the dry trays represent two complex and therefore cost-intensive process steps.

Der Erfindung liegt daher die Aufgabe zugrunde, ein einfaches Verfahren zum Beschicken und Entleeren der Trockenschalen mit lösungsmittelfeuchten, pumpbaren Ausgangsprodukten und pneumatisch förderbaren Endprodukten unter Einhaltung der Richtlinien für den Ex-Schutz und den Richtlinien für die MAK-Werte zu entwickeln und gleichzeitig die Kosten des Verfahrens zu reduzieren.The invention is therefore based on the object to develop a simple method for loading and emptying the drying trays with solvent-moist, pumpable starting products and pneumatically conveyable end products in compliance with the guidelines for explosion protection and the guidelines for the MAK values and at the same time the costs of Reduce process.

f Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Trockenschalen zum Befüllen mit einer Abdeckplatte verschlossen werden, in den so gebildeten Füllraum die lösungsmittelfeuchten Ausgangsprodukte gepumpt werden, zu Beginn der Trocknung der Füllraum geöffnet wird, nach Beendigung der Trocknung der Füllraum wieder geschlossen wird und anschließend die Endprodukte aus dem Füllraum pneumatisch weggefördert werden. Weitere Merkmale der erfindungsgemäßen Anordnung zur Durchführung des Verfahrens sind Gegenstand der Unteransprüche.f This object is achieved in that the drying trays are closed with a cover plate for filling, the solvent-moist starting products are pumped into the filling space thus formed, the filling space is opened at the beginning of drying, the filling space is closed again after drying has ended and then the end products are pneumatically transported away from the filling room. Further features of the arrangement according to the invention for performing the method are the subject of the dependent claims.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and will be described in more detail below.

Es zeigen

  • Figur 1 ein Verfahrensfließbild für eine Vakuumtrocknung in einem Vakuum-Trockenschrank.
  • Figur 2 einen Teilquerschnitt durch den Vakuum-Trockenschrank und eine Trockenschale während der Befüllung
  • Figur 3 einen Teilquerschnitt durch den Vakuum-Trockenschrank und eine Trockenschale während der Trocknung
  • Figur 4 einen Teilquerschnitt durch den Vakuum-Trockenschrank und eine Trockenschale während der Entleerung.
Show it
  • Figure 1 is a process flow diagram for vacuum drying in a vacuum drying cabinet.
  • Figure 2 shows a partial cross section through the vacuum drying cabinet and a drying bowl during filling
  • Figure 3 shows a partial cross section through the vacuum drying cabinet and a drying tray during drying
  • Figure 4 shows a partial cross section through the vacuum drying cabinet and a drying tray during emptying.

Gemäß Figur 1 wird aus dem Vorratsbehälter 1 mittels der Pumpe 2 über eine flexible Verbindung 3 Paste in die Trockenschalen 4 des Vakuum-Trcckenschrankes 5 gefördert.According to FIG. 1, paste is conveyed from the storage container 1 by means of the pump 2 via a flexible connection 3 into the drying trays 4 of the vacuum drying cabinet 5.

Vor dem Befüllen wird der Füllraum-wie in Figur 2 dargestellt - durch Absenken der Heizplatten 6 oder Anheben der Trockenschalen 4 gebildet. Durch die Größe und die Anzahl der Kolbenhübe der Pumpe 2 kann das einer Trockenschale entsprechende Füllraumvolumen in die Trockenschale 4 gepumpt werden. Dadurch ist eine gleichmäßige Befüllung aller Trockenschalen 4 gewährleistet. Nach dem Befüllen sämtlicher Trockenschalen 4 und dem Verschließen des Vakuum-Trockenschrankes 5 wird derselbe mittels einer Vakuumstation 7 evakuiert. Während des Evakuierens werden die Heizplatten 6 - wie in Figur 3 dargestellt - angehoben oder die Trockenschalen 4 abgesenkt. Die Wärmezufuhr für die Verdampfung des Lösungsmittels erfolgt über die Heizplatten 6. Die Lösungsmitteldämpfe werden an den Rohren 9 des Wärmetauschers 8 kondensiert oder desublimiert, die Rohre werden je nach Trocknungsart mit Kühlwasser 10 oder Sole 11 von tiefer Temperatur durchströmt. Nach Beendigung des Trocknungsvorganges wird wieder der Füllraum durch Absenken der Heizplatten 6 oder Anheben der Trockenschalen 4 geschlossen und der Vakuum-Trockenschrank 5 wird auf Normaldruck belüftet. Die in den Trockenschalen 4 ursprünglich vorhandene Paste wird durch das beschriebene Verfahren in ein pneumatisch förderbares Endprodukt umgewandelt. Nach dem Belüften auf Normaldruck und dem öffnen der Tür 5a wird die Klappe 12 geöffnet und das Endprodukt mittels eines Ventilators 14 abgesaugt und in dem Endproduktbehälter 15 aufgefangen. Der mitgerissene Feinstaub wird in einem zwischengeschalteten Filter 16 abgeschieden. Um eine vollständige Entleerung der Trockenschalen 4 zu gewährleisten, wird an den Trockenschalen 4 die Frontseite 4a hochgeklappt - wie in Figur 4 dargestellt - wodurch ein Lüftungsschlitz in Breite der Trockenschalen 4 freigelegt wird. Während der pneumatischen Entleerung der Trockenschalen 4 kann das Kondensat bzw. Subli- mat im Wärmetauscher 8 abgepumpt bzw. abgetaut und abgepumpt werden. Der während der Trocknung anfallende Staubanteil sammelt sich auf dem Boden des Vakuum-Trockenschrankes 5 und kann nach öffnen der Klappe 13 abgesaugt werden.Before filling, the filling space is shown in FIG. 2 provides - by lowering the heating plates 6 or lifting the drying trays 4. Due to the size and number of piston strokes of the pump 2, the filling space volume corresponding to a drying bowl can be pumped into the drying bowl 4. This ensures uniform filling of all drying trays 4. After all the drying trays 4 have been filled and the vacuum drying cabinet 5 has been closed, the latter is evacuated by means of a vacuum station 7. During the evacuation, the heating plates 6 are raised, as shown in FIG. 3, or the drying trays 4 are lowered. The heat supply for the evaporation of the solvent takes place via the heating plates 6. The solvent vapors are condensed or desublimated on the tubes 9 of the heat exchanger 8, depending on the type of drying, cooling water 10 or brine 11 are flowed through at a low temperature. After the drying process has ended, the filling chamber is closed again by lowering the heating plates 6 or lifting the drying trays 4 and the vacuum drying cabinet 5 is ventilated to normal pressure. The paste originally present in the drying trays 4 is converted into a pneumatically conveyable end product by the described method. After venting to normal pressure and opening the door 5a, the flap 12 is opened and the end product is sucked off by means of a fan 14 and collected in the end product container 15. The entrained fine dust is separated in an interposed filter 16. In order to ensure complete emptying of the drying trays 4, the front side 4a of the drying trays 4 is folded up - as shown in FIG. 4 - thereby exposing a ventilation slot the width of the drying trays 4. During the emptying of the pneumatic drying trays 4, the condensate or S ubli- can mat in the heat exchanger 8 and pumped and pumped defrosted will. The proportion of dust that arises during drying collects on the bottom of the vacuum drying cabinet 5 and can be suctioned off after the flap 13 has been opened.

Die mit dem erfindungsgemäßen Verfahren und der erfindungsgemäßen Anordnung zur Durchführung des Verfahrens erzielten Vorteile liegen insbesondere darin, Trockenschränke auch zur Trocknung von lösungsmittelfeuchten, pumpbaren Produkten einzusetzen, wobei die Richtlinien für den Ex-Schutz und die Richtlinien für die MAK-Werte eingehalten werden und gleichzeitig das Befüllen und Entleeren der Trockenschränke maschinell - und damit billiger - ausgeführt wird. Im Falle von Wasser als Lösungsmittel besteht bei der Befüllung der Trockenschalen zwar kein sicherheitstechnisches oder gesundheitliches Risiko, jedoch entfällt durch das beanspruchte Verfahren die Staubbelästigung beim Entleeren der Trockenschalen.The advantages achieved with the method according to the invention and the arrangement according to the invention for carrying out the method are, in particular, to use drying ovens also for drying solvent-moist, pumpable products, the guidelines for explosion protection and the guidelines for the MAK values being adhered to and at the same time the filling and emptying of the drying cabinets is carried out mechanically - and therefore cheaper. In the case of water as a solvent, there is no safety or health risk when filling the dry trays, but the claimed process eliminates the dust nuisance when emptying the dry trays.

Claims (4)

1. Verfahren zum Beschicken und Entleeren der Trockenschalen eines Trockenschrankes mit lösungsmittelfeuchten, pumpbaren Ausgangsprodukten und pneumatisch förderbaren Endprodukten, wobei die Trocknung durch Beheizung des Ausgangsproduktes mittels Strahlung, Konvektion oder Kontakt vorgenommen wird, dadurch gekennzeichnet, daß die Trockenschalen zum Befüllen mit einer Abdeckplatte verschlossen werden, in den so gebildeten Füllraum die lösungsmittelfeuchten Ausgangsprodukte gepumpt werden, zu Beginn der Trocknung der Füllraum geöffnet wird, nach Beendigung der Trocknung der Füllraum wieder geschlossen wird und anschließend die Endprodukt aus dem Füllraum pneumatisch weggefördert werden.1. A method for loading and emptying the drying trays of a drying cabinet with solvent-moist, pumpable starting products and pneumatically conveyable end products, the drying being carried out by heating the starting product by means of radiation, convection or contact, characterized in that the drying trays are closed with a cover plate for filling , the solvent-moist starting products are pumped into the filling space thus formed, the filling space is opened at the beginning of the drying, the filling space is closed again after the drying has ended and the end product is then pneumatically conveyed away from the filling space. 2. Anordnung zur Durchführung des Verfahrens gemäß Anspruch 1, gekennzeichnet durch - einen Vorratsbehälter (1) zur Bereitstellung der lösungsmittelfeuchten pumpbaren Ausgangsprodukte., - eine dem Vorratsbehälter nachgeschaltete Pumpe (2), - einen mit verstellbaren Trockenschalen (4)und oberhalb derselben mit verstellbaren Abdeckplatten (6) versehenen Trockenschrank (5) - mindestens eine flexible Leitung (3) als Verbindung zwischen der Pumpe und den Trockenschalen, - eine Vakuumstation (7) zur Erzeugung des für den Trocknungsvorgang erforderlichen Unterdruckes im Trockenschrank, - einen zwischen dem Trockenschrank und der Vakuumstation angeordneten, mit Rohren (9) ausgestatteten Wärmetauscher (8), - einen mit den Entleerungsstutzen des Trockenschrankes verbundenen Ventilator (14), - und einen zwischen dem Trockenschrank und dem Ventilator stehenden Endproduktbehälter (15) mit Filteraufsatz (16). 2. Arrangement for performing the method according to claim 1, characterized by - A storage container (1) for providing the solvent-moist pumpable starting products. - a pump (2) connected downstream of the storage container, - a drying cabinet (5) provided with adjustable drying trays (4) and above them with adjustable cover plates (6) - at least one flexible line (3) as a connection between the pump and the drying trays, a vacuum station (7) for generating the negative pressure required for the drying process in the drying cabinet, - A heat exchanger (8) arranged between the drying cabinet and the vacuum station and equipped with pipes (9), - a fan (14) connected to the emptying nozzle of the drying cabinet, - And one between the drying cabinet and the fan standing end product container (15) with filter attachment (16). 3. Anordnung zur Durchführung des Verfahrens gemäß Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Frontseite (4a) der Trockenschalen in ihrer gesamten Breite (4) um 90° schwenkbar ausgeführt ist.3. Arrangement for performing the method according to claims 1 and 2, characterized in that the front (4a) of the drying trays is designed to be pivotable by 90 ° in its entire width (4). 4. Anordnung zur Durchführung des Verfahrens gemäß Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß die Abdeckplatten (6) als Heizplatten ausgebildet sind.4. Arrangement for performing the method according to claims 1 to 3, characterized in that the cover plates (6) are designed as heating plates.
EP83103817A 1982-04-28 1983-04-20 Process and apparatus for carrying out the process for loading and unloading the receptacles of a drying cupboard Expired EP0092777B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823215753 DE3215753A1 (en) 1982-04-28 1982-04-28 METHOD AND ARRANGEMENT FOR CARRYING OUT THE METHOD FOR LOADING AND EMPTYING THE DRY TRAYS OF A DRYING CABINET
DE3215753 1982-04-28

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EP0092777A2 true EP0092777A2 (en) 1983-11-02
EP0092777A3 EP0092777A3 (en) 1985-03-06
EP0092777B1 EP0092777B1 (en) 1987-05-06

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EP (1) EP0092777B1 (en)
DE (2) DE3215753A1 (en)

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US11988448B1 (en) * 2023-05-17 2024-05-21 North China University Of Science And Technology Mineral powder pellet drying device

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CN112683014B (en) * 2020-12-24 2022-07-08 杭州协合医疗用品有限公司 Method for removing organic solvent in starch hemostatic microspheres
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Publication number Publication date
US4497120A (en) 1985-02-05
EP0092777B1 (en) 1987-05-06
DE3215753A1 (en) 1983-11-03
EP0092777A3 (en) 1985-03-06
DE3371411D1 (en) 1987-06-11

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