EP0465950B1 - Contact belt dryer - Google Patents

Contact belt dryer Download PDF

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Publication number
EP0465950B1
EP0465950B1 EP91110722A EP91110722A EP0465950B1 EP 0465950 B1 EP0465950 B1 EP 0465950B1 EP 91110722 A EP91110722 A EP 91110722A EP 91110722 A EP91110722 A EP 91110722A EP 0465950 B1 EP0465950 B1 EP 0465950B1
Authority
EP
European Patent Office
Prior art keywords
conveyor belt
contact belt
gas
heating plate
belt dryer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91110722A
Other languages
German (de)
French (fr)
Other versions
EP0465950A1 (en
Inventor
Werner Dr. Liedy
Werner Rindfleisch
Wolfgang Keil
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
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Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of EP0465950A1 publication Critical patent/EP0465950A1/en
Application granted granted Critical
Publication of EP0465950B1 publication Critical patent/EP0465950B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F26B17/04—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the belts being all horizontal or slightly inclined
    • 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
    • F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat

Definitions

  • Contact belt dryers are used for drying dyes and pigments with frequent product changes.
  • Such contact belt dryers are described, for example, in the patents BE-A-45 36 54 and US-A-3,403,456.
  • the heating plates arranged above and below the conveyor belt are designed with or without holes.
  • the task was to significantly increase the evaporation performance of the contact belt dryer without impairing the ease of cleaning.
  • a contact belt dryer consisting of a noble conveyor belt for the transport of a product to be dried, a lower heating plate arranged below the conveyor belt, a heating plate arranged above the conveyor belt and designed as a perforated plate, and a baffle plate arranged perpendicular to the direction of flow of a hot gas for deflecting the gas and a gas extraction device.
  • Embodiments of the contact belt dryer according to the invention are the subject of the dependent claims.
  • the contact belt dryer consists of an endless, driven conveyor belt 1, which is deflected via two rollers 2.
  • a lower heating plate 3 is arranged below the conveyor belt and an upper heating plate 4 is arranged above the conveyor belt.
  • the product 5 to be dried migrates through the contact belt dryer during the drying process.
  • the upper heating plate is designed as a perforated plate 6.
  • the hot gas 7 flowing to the contact belt dryer is deflected via a baffle plate 8 arranged perpendicular to the gas flow direction, then flows through the perforated upper heating plate and over the product to be dried.
  • the gas is used on the one hand to discharge the vapors - which flow out of the product when it dries - and on the other hand to supply heat to the product.
  • This gas / vapor mixture is sucked out of the contact belt dryer via the gas suction device 9.
  • the speed of the outflowing gas should be 1-2 m / sec, based on the free cross-section.
  • the distance between the conveyor belt and the upper heating plate - perforated plate - should be between 100 and 300 mm.
  • the hole diameter in the perforated plate should be between 1 and 4 mm, the hole spacing should be 10 to 70 mm.
  • perforated plate can also be produced with slot nozzles or similar embodiments.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Contact belt dryer, consisting of an endless conveyor belt for the transport of a product to be dried, a lower heating plate arranged below the conveyor belt, an upper heating plate arranged above the conveyor belt, a gas distribution device for hot gas and a gas extraction device, the gas distribution device being integrated into the upper heating plate and designed as a perforated plate.

Description

Kontaktbandtrockner werden für die Trocknung von Farbstoffen und Pigmenten bei häufigem Produktwechsel eingesetzt.Contact belt dryers are used for drying dyes and pigments with frequent product changes.

Es ist bekannt, bei solchen Kontaktbandtrocknern - die bei häufigem Produktwechsel leicht gereinigt werden können - die Gasführung, im wesentlichen notwendig zur Brüdenausschleusung - Brüden aus dem zu trocknenden Produkt - über das auf dem Förderband liegende und durch den Kontaktbandtrockner hindurchlaufende zu trocknende Produkt strömen zu lassen. Die dabei erzielbaren Verdampfungsleistungen sind jedoch so gering, daß ein wirtschaftlicher Betrieb - im Vergleich zu anderen Trocknertypen, beispielsweise einem Trockenschrank - nicht möglich ist.It is known in such contact belt dryers - which can be easily cleaned with frequent product changes - to let the gas flow, essentially necessary for the evacuation of vapors - vapors from the product to be dried - flow over the product lying on the conveyor belt and passing through the contact belt dryer to be dried . However, the evaporation capacities that can be achieved are so low that economical operation - in comparison to other dryer types, for example a drying cabinet - is not possible.

Solche Kontaktbandtrockner sind beispielsweise in den Patentschriften BE-A-45 36 54 und US-A-3,403,456 beschrieben. Bei diesen Trocknern sind die oberhalb und unterhalb des Förderbandes angeordneten Heizplatten mit bzw. ohne Löcher ausgebildet.Such contact belt dryers are described, for example, in the patents BE-A-45 36 54 and US-A-3,403,456. In these dryers, the heating plates arranged above and below the conveyor belt are designed with or without holes.

Es stellte sich die Aufgabe, die Verdampfungsleistung des Kontaktbandtrockners deutlich zu erhöhen, ohne die Reinigungsfreundlichkeit zu beeinträchtigen.The task was to significantly increase the evaporation performance of the contact belt dryer without impairing the ease of cleaning.

Diese Aufgabe wird erfindungsgemäß gelöst durch einen Kontaktbandtrockner, bestehend aus einem edlossen Förderband für den Transport eines zu trocknenden Produktes, einer unterhalb des Förderbandes angeordneten unteren Heizplatte, einer oberhalb des Förderbandes angeordneten und als Lochplatte ausgebildeten Heizplatte, einer senkrecht zur Anströmrichtung eines heißen Gases angeordneten Prallplatte zur Umlenkung des Gases und einer Gasabsaugeinrichtung. Durch die Ausbildung der oberen Heizplatte mit Löchern und der unteren ohne Löcher wird die Luft nicht durch das Produkt hindurchgeblasen, sondern über das Produkt hinweggeführt.This object is achieved according to the invention by a contact belt dryer consisting of a noble conveyor belt for the transport of a product to be dried, a lower heating plate arranged below the conveyor belt, a heating plate arranged above the conveyor belt and designed as a perforated plate, and a baffle plate arranged perpendicular to the direction of flow of a hot gas for deflecting the gas and a gas extraction device. By forming the upper heating plate with holes and the lower one without holes, the air is not blown through the product, but is led over the product.

Ausführungsarten des erfindungsgemäßen Kontaktbandtrockners sind Gegenstand der Unteransprüche.Embodiments of the contact belt dryer according to the invention are the subject of the dependent claims.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.

  • Figur 1 zeigt einen Längsschnitt durch den Kontaktbandtrockner,
  • Figur 2 zeigt einen Schnitt A-A durch den Kontaktbandtrockner.
An embodiment of the invention is shown in the drawing and will be described in more detail below.
  • FIG. 1 shows a longitudinal section through the contact belt dryer,
  • Figure 2 shows a section AA through the contact belt dryer.

Der Kontaktbandtrockner besteht aus einem endlosen, angetriebenen Förderband 1, das über zwei Rollen 2 umgelenkt wird. Unterhalb des Förderbandes ist eine untere Heizplatte 3 und oberhalb des Förderbandes eine obere Heizplatte 4 angeordnet. Das zu trocknende Produkt 5 wandert während des Trocknungsvorganges durch den Kontaktbandtrockner hindurch. Die obere Heizplatte ist hierbei als Lochplatte 6 ausgebildet. Das dem Kontaktbandtrockner zuströmende heiße Gas 7 wird über eine senkrecht zur Anströmrichtung des Gases angeordnete Prallplatte 8 umgelenkt, strömt anschließend durch die gelochte obere Heizplatte hindurch und über das zu trocknende Produkt hinweg. Das Gas dient einerseits zur Ausschleusung der Brüden - die bei der Trocknung des Produktes aus demselben ausströmen - und andererseits zur Wärmezufuhr an das Produkt.The contact belt dryer consists of an endless, driven conveyor belt 1, which is deflected via two rollers 2. A lower heating plate 3 is arranged below the conveyor belt and an upper heating plate 4 is arranged above the conveyor belt. The product 5 to be dried migrates through the contact belt dryer during the drying process. The upper heating plate is designed as a perforated plate 6. The hot gas 7 flowing to the contact belt dryer is deflected via a baffle plate 8 arranged perpendicular to the gas flow direction, then flows through the perforated upper heating plate and over the product to be dried. The gas is used on the one hand to discharge the vapors - which flow out of the product when it dries - and on the other hand to supply heat to the product.

Dieses Gas-/Brüdengemisch wird über die Gasabsaugeinrichtung 9 aus dem Kontaktbandtrockner abgesaugt. Hierbei sollte die Geschwindigkeit des abströmenden Gases 1-2 m/sek, bezogen auf den freien Querschnitt, betragen. Der Abstand zwischen Förderband und oberer Heizplatte -Lochplatte - sollte zwischen 100 und 300 mm liegen.This gas / vapor mixture is sucked out of the contact belt dryer via the gas suction device 9. The speed of the outflowing gas should be 1-2 m / sec, based on the free cross-section. The distance between the conveyor belt and the upper heating plate - perforated plate - should be between 100 and 300 mm.

Der Lochdurchmesser in der Lochplatte sollte zwischen 1 und 4 mm liegen, der Lochabstand sollte 10 bis 70 mm betragen.The hole diameter in the perforated plate should be between 1 and 4 mm, the hole spacing should be 10 to 70 mm.

Es versteht sich von selbst, daß die Lochplatte auch mit Schlitzdüsen oder ähnlichen Ausführungsformen hergestellt werden kann.It goes without saying that the perforated plate can also be produced with slot nozzles or similar embodiments.

Mittels dieser speziellen Gasverteilungseinrichtung konnte die Verdampfungsleistung des Kontaktbandtrockners bei der Trocknung von Feststoffen und Pigmenten um ca. 100 % verbessert werden. Die resultierende Verdampfungsleistung ist so groß, daß der Kontaktbandtrockner wirtschaftlich betrieben werden kann. Gleichzeitig bleibt der Vorzug dieses Apparatetyps erhalten, nämlich die sehr gute und schnelle Reinigbarkeit bei Produktwechsel.Using this special gas distribution device, the evaporation performance of the contact belt dryer when drying solids and pigments could be improved by approx. 100%. The resulting evaporation capacity is so great that the contact belt dryer can be operated economically. At the same time, the advantage of this type of device remains, namely the very good and quick cleanability when changing products.

Claims (3)

  1. A contact belt dryer, comprising an endless conveyor belt 1 for transporting a product to be dried, a bottom heating plate 3 arranged beneath the conveyor belt, a heating plate 5 arranged above the conveyor belt and configured as a perforated plate, a baffle plate 8 perpendicular to the flow direction of a hot gas 7 for deflecting the gas and a gas extraction device 9.
  2. A contact belt dryer as claimed in claim 1, wherein the diameters of the holes in the perforated plate are from 1 to 4 mm.
  3. A contact belt dryer as claimed in claims 1 and 2, wherein the hole spacing is from 10 to 70 mm.
EP91110722A 1990-07-07 1991-06-28 Contact belt dryer Expired - Lifetime EP0465950B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4021711A DE4021711A1 (en) 1990-07-07 1990-07-07 CONTACT TAPE DRYER
DE4021711 1990-07-07

Publications (2)

Publication Number Publication Date
EP0465950A1 EP0465950A1 (en) 1992-01-15
EP0465950B1 true EP0465950B1 (en) 1993-10-13

Family

ID=6409878

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91110722A Expired - Lifetime EP0465950B1 (en) 1990-07-07 1991-06-28 Contact belt dryer

Country Status (5)

Country Link
EP (1) EP0465950B1 (en)
AT (1) ATE95914T1 (en)
DE (2) DE4021711A1 (en)
DK (1) DK0465950T3 (en)
ES (1) ES2044655T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103148689A (en) * 2013-03-27 2013-06-12 上海化工研究院 Band drying device for preparing polytetrafluoroethylene (PTFE) resin polymerized by dispersion method
AU2014232364B2 (en) * 2013-03-15 2018-07-12 E & J Gallo Winery Dryer using adjustable conditioned air flow

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4336736A1 (en) * 1993-10-28 1995-05-04 Bayer Ag Device for continuously filtering and drying a solid suspension

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE453654A (en) *
FR1384072A (en) * 1963-11-15 1965-01-04 Improvements to carpet dryers for pasty products
US3403456A (en) * 1967-02-14 1968-10-01 White Consolidated Ind Inc Impingement type drying apparatus
US3525164A (en) * 1968-12-10 1970-08-25 Wolverine Corp Apparatus for gaseous treatment of moving webs
EP0356388B1 (en) * 1988-08-22 1992-11-19 Robert Baer Process and apparatus for dehydrating water-containing masses

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2014232364B2 (en) * 2013-03-15 2018-07-12 E & J Gallo Winery Dryer using adjustable conditioned air flow
CN103148689A (en) * 2013-03-27 2013-06-12 上海化工研究院 Band drying device for preparing polytetrafluoroethylene (PTFE) resin polymerized by dispersion method
CN103148689B (en) * 2013-03-27 2014-10-15 上海化工研究院 Band drying device for preparing polytetrafluoroethylene (PTFE) resin polymerized by dispersion method

Also Published As

Publication number Publication date
DE59100480D1 (en) 1993-11-18
ES2044655T3 (en) 1994-01-01
ATE95914T1 (en) 1993-10-15
DK0465950T3 (en) 1994-01-03
EP0465950A1 (en) 1992-01-15
DE4021711A1 (en) 1992-01-09

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