EP0142082A2 - Method and apparatus for galvanizing ribbed tubes - Google Patents

Method and apparatus for galvanizing ribbed tubes Download PDF

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Publication number
EP0142082A2
EP0142082A2 EP84112869A EP84112869A EP0142082A2 EP 0142082 A2 EP0142082 A2 EP 0142082A2 EP 84112869 A EP84112869 A EP 84112869A EP 84112869 A EP84112869 A EP 84112869A EP 0142082 A2 EP0142082 A2 EP 0142082A2
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European Patent Office
Prior art keywords
galvanizing
zinc
blow
medium
chromating
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EP84112869A
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German (de)
French (fr)
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EP0142082A3 (en
EP0142082B1 (en
Inventor
Werner Ackermann
Klaus Dipl.-Ing. Schirmuly
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Hoesch AG
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Hoesch AG
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Priority to AT84112869T priority Critical patent/ATE43646T1/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/38—Wires; Tubes
    • C23C2/385—Tubes of specific length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/022—Cleaning travelling work

Definitions

  • the invention relates to a method for hot-dip galvanizing finned tubes, wherein the finned tubes of different geometry are pretreated, i. i.e., degreased, pickled, rinsed, etc. beforehand, and then dipped in a galvanizing bath to be coated with molten zinc or a zinc alloy, and on a device for carrying out the method.
  • US Pat. No. 3,722,463 describes a further development of US Patent No. cited in the aforementioned document. 3 122 114 - continuous pipe production and galvanizing.
  • the US-PS 3 722 463 relates to a method and a device, only coordinated in the design and thus only suitable for the hot-dip galvanizing of smooth tubes.
  • the individual smooth tubes are connected to form an endless tube.
  • the pretreatment of the connected smooth tubes includes a flux treatment (zinc ammonium chloride) and subsequent drying at approx. 200 ° C. This procedure requires considerable exhaust air volumes with a large pollutant load in the galvanizing process due to the sublimation of the flux.
  • the invention on which the present application is based includes a method and a device for galvanizing finned tubes without the conventional flux treatment required according to the aforementioned publication.
  • the process and the set-up take into account all the specific requirements for hot-dip galvanizing the finned tube, with variable handling of all relevant parameters and taking into account all requirements relevant to environmental protection.
  • the finned tube essentially consists of an oval base tube (or other cross-sections) on which a sheet metal fin is wound diagonally in an endless winding process, whereby the finned tube differs significantly from a smooth tube, not least because of the surface area increased by a factor of 40.
  • Rib and base tube have no metallic connection and have considerable differences in material thickness. The division of the rib on the base tube is approx. 3 mm.
  • the state of the art in hot dip galvanizing finned tubes is immersion in a zinc melt with upstream degreasing, rinsing, pickling, rinsing and fluxing.
  • These upstream treatments are individual separate processes, the finned tubes each in individual immersion baths containing the corresponding degreasing, rinsing, pickling or the like medium, for. B. be immersed by means of a crane. Cooling takes place after galvanizing in a water bath. Qualified immediate treatment of the finned tube after galvanizing is not possible.
  • the object is achieved in such a way that the finned tubes automatically by means of a transport device consisting of horizontally and vertically attached support, guide and drive rollers or transport chain in the preheating area at a treatment level the treatment stages, the degreasing, rinsing, pickling , Wärm-, galvanizing -, refrigerating, drying, chromating and blow-off / mech.
  • Stripping / shaking stages include, run through in succession, the finned tubes in the galvanizing stage are flooded in a galvanizing furnace.
  • Stripping such as B. brushing / vibrating device for zinc, cooling and drying device, chromating device with blow-off device for chromating media, removal device, transport system, is characterized in that the system components are arranged in line one behind the other.
  • the advantages of the method and the device according to the invention are, in particular, that it is possible to pretreat, galvanize and post-treat finned tubes in continuous closed treatment stages connected in quick succession in line, and thus in the optimal economical control of the zinc layer thickness with optimized Technology of the entire system taking into account emission-relevant factors.
  • the device for hot-dip galvanizing finned tubes essentially consists of loading device 1, degreasing device 2 with blow-off device, rinsing device 3 with blow-off device, pickling device 4 with blow-off device, rinsing device 5 with blow-off device, preheating furnace 6, galvanizing furnace 7 with blow-off, vibrating / stripping device, cooling and Drying device 8, chromating device 9 with blow-off device, removal device 10 and transport system (not shown).
  • the finned tubes to be treated are automatically transported by means of the transport system, not shown, consisting of support, guide and drive rollers or, in the area of the preheating furnace, consisting of a transport chain.
  • the transport speed is infinitely variable.
  • the finned tubes are fed manually via the loading device 1.
  • the treatment media are applied in the degreasing 2, rinsing 3, pickling 4, rinsing 5, cooling 8 and chromating 9 treatment stages by means of nozzles (not shown) in the spraying process.
  • the applied media are blown off after each special treatment in order to avoid or minimize discharge losses.
  • the indirectly gas-heated preheating section 6 is composed of several furnace segments which are equipped with individual controls.
  • the finned tubes are thus heated in an advantageous manner, sliding from room temperature to the galvanizing temperature in the zinc bath of approximately 450-560 "C.
  • the entire system works in a protective gas atmosphere, which prevents oxidation of the finned tubes in the preheating zone 6.
  • Nitrogen with a hydrogen content of approximately 10% is preferably used as the inert gas.
  • the finned tubes are also galvanized in a protective gas atmosphere 17 in the temperature range of approx. 450 - 560 * C free of emissions and residues.
  • the finned tubes are flooded with zinc 18, 19 in the specially designed galvanizing furnace 7 with charging area 20 and melting area with galvanizing pan 12 by means of a zinc pump 16.
  • the galvanizing pan 12 is provided with a guide in the inlet and outlet area.
  • the special arrangement of the galvanizing pan 12 in the galvanizing furnace 7 largely prevents leakage losses of the protective gas atmosphere 17 at the operating level of the zinc alloy.
  • the zinc 18, 19 discharged from the galvanizing pan 12 with the finned tube is removed by means of a blow-off nozzle 13 or mech. Wiped off or removed the scraper / vibrator vertically. The occurrence of bridges between the finned tube fins and the formation of a drainage edge is effectively prevented.
  • the temporary corrosion protection is provided by the chromating.
  • the galvanizing furnace 7 consists of a housing with a refractory lining 11, a zinc collecting container 14 being arranged below the blow-off nozzle 13.
  • the method and the device according to the invention should also include the use of zinc or other metal alloys and the possibility of flux treatment.
  • the flux treatment is followed by treatment level 5.
  • the flux medium is applied analogously to the treatment stages degreasing 2, rinsing 3, pickling 4, rinsing 5, cooling 8 and chromating 9. In order to avoid loss of discharge, the applied flux is blown off.
  • the finned tubes pretreated in this way are heated in the indirectly gas-heated preheating section 6, which is composed of several furnace segments with individual controls.
  • the finned tubes are thus heated in an advantageous manner, sliding from room temperature to approximately 150 "C.
  • the entire system works in a protective gas atmosphere, which prevents oxidation of the finned tubes in the preheating zone 6.
  • Nitrogen is preferably used as the inert gas.
  • the finned tubes are also galvanized in a protective gas atmosphere 17 in the temperature range of approx. 450 - 560 * C.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Coating With Molten Metal (AREA)
  • Chemically Coating (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Fire Alarms (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

1. Apparatus for galvanising ribbed tubes, the apparatus having components which are arranged in line, one behind the other, at one treatment level, which are connected by an automatically operating conveyor device with horizontal and vertical support, guide and driving rolls, or, in the preheating area, with a conveyor chain device and which comprises a feed facility (1), a degreasing facility (2) with a blow-off device for the degreasing medium, a washing facility (3) with a blow-off device for the washing medium, a dipping facility (4) with a blow-off device for the dipping medium, a washing facility (5) with a blow-off device for the washing medium a preheating furnace (6), a galvanising furnace (7) with a protective atmosphere, a blow-off device (13) or a device for removing excess zinc, as well as a cooling and drying facility (8) with nozzles supplied with water and air and, if necessary, a chromating facility (9) with a blow-off device for the chromating medium, wherein the galvanising furnace (7) for receiving an alloy of molten zinc has a melting area (18), a galvanising pan (12) arranged over the melting area, a zinc charging area (20), wherein the molten zinc can be pumped from the melting area (18) into the galvanising pan (12) which has an overflow, and wherein the melting area (18) and the zinc charging area (20) are separated by a partition extending downwards into the zinc.

Description

Verfahren und Einrichtung zum Feuerverzinken von RippenrohrenProcess and device for hot-dip galvanizing finned tubes

Die Erfindung bezieht sich auf ein Verfahren zum Feuerverzinken von Rippenrohren, wobei die Rippenrohre unterschiedlicher Geometrie vorbehandelt werden, d. h., vorher entfettet, gebeizt, gespült usw. werden und dann zum Überziehen mit geschmolzenem Zink oder einer Zinklegierung in ein Verzinkungsbad getaucht werden sowie auf eine Einrichtung zur Durchführung des Verfahrens.The invention relates to a method for hot-dip galvanizing finned tubes, wherein the finned tubes of different geometry are pretreated, i. i.e., degreased, pickled, rinsed, etc. beforehand, and then dipped in a galvanizing bath to be coated with molten zinc or a zinc alloy, and on a device for carrying out the method.

In der US-PS 3 722 463 ist eine Weiterentwicklung des in der vorgenannten Schrift zitierten US-Patentes No. 3 122 114 - kontinuierliche Rohrherstellung und -verzinkung - dargestellt. Dabei bezieht sich die US-PS 3 722 463 auf ein Verfahren und eine Einrichtung, ausschließlich abgestimmt in der Auslegung und somit ausschließlich geeignet für das Feuerverzinken von Glattrohren. Die einzelnen Glattrohre sind hierbei zu einem Endlosrohr verbunden. Die Vorbehandlung der verbundenen Glattrohre schließt eine Flußmittelbehandlung (Zink-Ammonium-Chlorid) und anschließende Trocknung bei ca. 200 °C ein. Diese Verfahrensweise bedingt beim Verzinkungsvorgang durch das Sublimieren des Flußmittels erhebliche Abluftvolumina mit großer Schadstoffbeladung. Umweltschutzrelevanten Erfordernissen ist hierbei nur mit einer entsprechenden Ablufterfassung und nachgeschalteter Reinigungsanlage zu entsprechen bei hierbei bedingt erheblich reduzierter Wirtschaftlichkeit der Gesamtanlage. Dieses bekannte Verfahren und die Einrichtung für das Feuerverzinken von Rohren ist ausschließlich für Glattrohre geeignet unter Einbezug einer klassischen Flußmittelbehandlung und allen hierdurch entstehenden negativen Aspekten.US Pat. No. 3,722,463 describes a further development of US Patent No. cited in the aforementioned document. 3 122 114 - continuous pipe production and galvanizing. The US-PS 3 722 463 relates to a method and a device, only coordinated in the design and thus only suitable for the hot-dip galvanizing of smooth tubes. The individual smooth tubes are connected to form an endless tube. The pretreatment of the connected smooth tubes includes a flux treatment (zinc ammonium chloride) and subsequent drying at approx. 200 ° C. This procedure requires considerable exhaust air volumes with a large pollutant load in the galvanizing process due to the sublimation of the flux. Environmental protection-related requirements can only be met with a corresponding exhaust air detection and downstream cleaning system, with the overall system being considerably less economical. This known method and the device for the hot-dip galvanizing of pipes is only suitable for smooth pipes with the inclusion of a classic flux treatment and all the negative aspects resulting therefrom.

Dagegen beinhaltet die der vorliegenden Anmeldung zugrunde liegende Erfindung ein Verfahren und eine Einrichtung zur Verzinkung von Rippenrohren ohne die nach der vorgenannten Druckschrift notwendige klassische Flußmittelbehandlung. Das Verfahren und die Einrichtung berücksichtigen alle spezifischen Erfordernisse bei der Feuerverzinkung des Rippenrohres, bei variabler Handhabung aller relevanten Parameter und unter Berücksichtigung aller umweltschutzrelevanten Erfordernisse.In contrast, the invention on which the present application is based includes a method and a device for galvanizing finned tubes without the conventional flux treatment required according to the aforementioned publication. The process and the set-up take into account all the specific requirements for hot-dip galvanizing the finned tube, with variable handling of all relevant parameters and taking into account all requirements relevant to environmental protection.

Das Rippenrohr besteht im wesentlichen aus einem ovalen Grundrohr (oder anderen Querschnitten), auf dem eine Blechrippe im Wickelverfahren endlos diagonal aufgewickelt ist, wobei sich das Rippenrohr wesentlich von einem Glattrohr unterscheidet, nicht zuletzt durch die um den Faktor 40 vergrößerte Oberfläche. Rippe und Grundrohr besitzen keine metallische Verbindung und weisen erhebliche Unterschiede in den Materialstärken auf. Die Teilung der Rippe auf dem Grundrohr beträgt ca. 3 mm.The finned tube essentially consists of an oval base tube (or other cross-sections) on which a sheet metal fin is wound diagonally in an endless winding process, whereby the finned tube differs significantly from a smooth tube, not least because of the surface area increased by a factor of 40. Rib and base tube have no metallic connection and have considerable differences in material thickness. The division of the rib on the base tube is approx. 3 mm.

Stand der Technik bei der Feuerverz-inkung von Rippenrohren ist das Eintauchen in eine Zinkschmelze mit vorgeschaltetem Entfetten, Spülen, Beizen, Spülen und Fluxen. Diese vorgeschalteten Behandlungen sind einzelne separate Vorgänge, wobei die Rippenrohre jeweils in einzelne das entsprechende Entfettungs-, Spül-, Beiz- oder dgl.- medium enthaltende Tauchbäder z. B. mittels eines Kranes eingetaucht werden. Die Abkühlung erfolgt nach der Verzinkung im Wasserbad. Eine sofortige weitere Behandlung des Rippenrohres nach der Verzinkung ist hierbei qualifiziert nicht möglich.The state of the art in hot dip galvanizing finned tubes is immersion in a zinc melt with upstream degreasing, rinsing, pickling, rinsing and fluxing. These upstream treatments are individual separate processes, the finned tubes each in individual immersion baths containing the corresponding degreasing, rinsing, pickling or the like medium, for. B. be immersed by means of a crane. Cooling takes place after galvanizing in a water bath. Qualified immediate treatment of the finned tube after galvanizing is not possible.

Die bei der Tauchverzinkung auftretenden Probleme sind bekannt, begründet in der komplizierten Geometrie des Rippenrohres. Eine zufriedenstellende Verzinkungsqualität ist insgesamt, wenn überhaupt, nur mit sehr hohem anlagentechnischen Aufwand zu erreichen bei gleichzeitig stark reduzierter Tauchfrequenz und somit erheblich beeinträchtigter Wirtschaftlichkeit.The problems that occur with hot dip galvanizing are known, due to the complicated geometry of the finned tube. If at all, satisfactory galvanizing quality can only be achieved, if at all, with a very high level of technical equipment and at the same time the diving frequency is greatly reduced and the economy is significantly impaired.

Für die Steuerung der Zinkauflage stehen nur wenige Parameter mit äußerst geringer Anwendungsbandbreite zur Verfügung.Only a few parameters with an extremely narrow range of applications are available for controlling the zinc coating.

Es ist daher Aufgabe der Erfindung, ein Verfahren sowie eine Einrichtung zur Durchführung des Verfahrens der eingangs genannten Art zu schaffen, das bzw. die mit zusätzlichen Parametern eine größtmögliche Anwendungsbandbreite unter Berücksichtigung der Wirtschaftlichkeit und der für den Umweltschutz relevanten Erfordernisse gewährleistet.It is therefore an object of the invention to provide a method and a device for carrying out the method of the type mentioned at the outset which, with additional parameters, ensure the greatest possible range of applications, taking into account the economic efficiency and the requirements relevant to environmental protection.

Nach der Erfindung wird die Aufgabe in der Weise gelöst, daß die Rippenrohre automatisch mittels Transporteinrichtung, bestehend aus horizontal und vertikal angebrachten Stütz-, Führungs- und Treibrollen bzw. Transportkette im Vorwärmbereich auf einem Behandlungsniveau die Behandlungsstufen, die Entfettungs, Spül-, Beiz-, Wärm-, Verzinkungs-, Kühl-, Trocken-, Chromatierungs- und Abblas-/mech. Abstreif-/Rüttelstufen beinhalten, nacheinander durchlaufen, wobei die Rippenrohre in der Verzinkungsstufe in einem Verzinkungsofen überflutet werden.According to the invention the object is achieved in such a way that the finned tubes automatically by means of a transport device consisting of horizontally and vertically attached support, guide and drive rollers or transport chain in the preheating area at a treatment level the treatment stages, the degreasing, rinsing, pickling , Wärm-, galvanizing -, refrigerating, drying, chromating and blow-off / mech. Stripping / shaking stages include, run through in succession, the finned tubes in the galvanizing stage are flooded in a galvanizing furnace.

In den Ansprüchen 2 bis 8 sind vorteilhafte Ausführungen des Verfahrens nach Anspruch 1 gekennzeichnet.In the claims 2 to 8 advantageous embodiments of the method according to claim 1 are characterized.

Die Einrichtung zur Durchführung des erfindungsgemäßen Verfahrens zum Feuerverzinken von Rippenrohren unterschiedlicher Geometrie mit den Anlagenkomponenten Beschickungseinrichtung, Entfettungseinrichtung mit Abblaseinrichtung für Entfettungsmedium, Spüleinrichtung mit Abblaseinrichtung für Spülmedium, Beizeinrichtung mit Abblaseinrichtung für Beizmedium, Spüleinrichtung mit Abblaseinrichtung für Spülmedium, Vorwärmofen, Verzinkungsofen mit Abblas-/mech. Abstreifwie z. B. Bürsten/Rütteleinrichtung für Zink, Kühl- und Trockeneinrichtung, Chromatierungseinrichtung mit Abblaseinrichtung für Chromatierungs-Medien, Entnahmeeinrichtung, Transportsystem, kennzeichnet sich dadurch, daß die Anlagenkomponenten in Linie hintereinander angeordnet sind.The device for carrying out the method according to the invention for hot-dip galvanizing finned tubes of different geometries with the system components charging device, degreasing device with blow-off device for degreasing medium, rinsing device with blow-off device for rinsing medium, pickling device with blow-off device for pickling medium, rinsing device with blow-off device for rinsing medium, preheating furnace, galvanizing furnace with blow-off / mech . Stripping such as B. brushing / vibrating device for zinc, cooling and drying device, chromating device with blow-off device for chromating media, removal device, transport system, is characterized in that the system components are arranged in line one behind the other.

Zweckmäßige Ausführungen der Einrichtung zur Durchführung des Verfahrens sind in den Ansprüchen 10 und 11 gekennzeichnet.Appropriate designs of the device for carrying out the method are characterized in claims 10 and 11.

Die Vorteile des Verfahrens und der Einrichtung nach der Erfindung liegen insbesondere darin, daß es ermöglicht wird, Rippenrohre in kurz hintereinander in Linie geschalteten, geschlossenen Behandlungsstufen kontinuierlich oder diskontinuierlich vorbehandeln, verzinken und nachbehandeln zu können und damit in der optimalen wirtschaftlichen Steuerung der Zinkschichtdicke bei optimierter Technik der Gesamtanlage unter Berücksichtigung emissionsrelevanter Faktoren.The advantages of the method and the device according to the invention are, in particular, that it is possible to pretreat, galvanize and post-treat finned tubes in continuous closed treatment stages connected in quick succession in line, and thus in the optimal economical control of the zinc layer thickness with optimized Technology of the entire system taking into account emission-relevant factors.

Im folgenden wird die Erfindung anhand schematischer Zeichnungen näher erläutert.The invention is explained in more detail below with the aid of schematic drawings.

Es zeigen:

  • Fig. 1 eine erfindungsgemäße Einrichtung mit Anlagenkomponenten,
  • Fig. 2 einen Längsschnitt eines Verzinkungsofens.
Show it:
  • 1 shows a device according to the invention with system components,
  • Fig. 2 shows a longitudinal section of a galvanizing furnace.

Die Einrichtung zum Feuerverzinken von Rippenrohren besteht im wesentlichen aus Beschickungseinrichtung 1, Entfettungseinrichtung 2 mit Abblaseinrichtung, Spüleinrichtung 3 mit Abblaseinrichtung, Beizeinrichtung 4 mit Abblaseinrichtung, Spüleinrichtung 5 mit Abblaseinrichtung, Vorwärmofen 6, Verzinkungsofen 7 mit Abblas-, Rüttel-/Abstreifeinrichtung, Kühl- und Trockeneinrichtung 8, Chromatierungseinrichtung 9 mit Abblaseinrichtung, Entnahmeeinrichtung 10 und nicht dargestellternTransportsystem.The device for hot-dip galvanizing finned tubes essentially consists of loading device 1, degreasing device 2 with blow-off device, rinsing device 3 with blow-off device, pickling device 4 with blow-off device, rinsing device 5 with blow-off device, preheating furnace 6, galvanizing furnace 7 with blow-off, vibrating / stripping device, cooling and Drying device 8, chromating device 9 with blow-off device, removal device 10 and transport system (not shown).

Die zu behandelnden Rippenrohre werden mittels des nicht dargestellten Transportsystems, bestehend aus Stütz-, Führungs- und Treibrollen bzw. im Bereich des Vorwärmofens bestehend aus einer Transportkette, automatisch transportiert. Die Transportgeschwindigkeit ist stufenlos regelbar.The finned tubes to be treated are automatically transported by means of the transport system, not shown, consisting of support, guide and drive rollers or, in the area of the preheating furnace, consisting of a transport chain. The transport speed is infinitely variable.

Die Einspeisung der Rippenrohre erfolgt manuell über die Beschickungseinrichtung 1.The finned tubes are fed manually via the loading device 1.

Das Aufbringen der Behandlungsmedien in den Behandlungsstufen Entfetten 2, Spülen 3, Beizen 4, Spülen 5, Kühlen 8 und Chromatieren 9 erfolgt mittels nicht dargestellter Düsen im Spritzverfahren. Die aufgebrachten Medien werden jeweils nach der speziellen Behandlung abgeblasen, um Austragungsverluste zu vermeiden bzw. zu minimieren.The treatment media are applied in the degreasing 2, rinsing 3, pickling 4, rinsing 5, cooling 8 and chromating 9 treatment stages by means of nozzles (not shown) in the spraying process. The applied media are blown off after each special treatment in order to avoid or minimize discharge losses.

Die indirekt gasbeheizte Vorwärmstrecke 6 ist aus mehreren Ofensegmenten zusammengesetzt, die mit Einzelsteuerung ausgerüstet sind.The indirectly gas-heated preheating section 6 is composed of several furnace segments which are equipped with individual controls.

Die Erwärmung der Rippenrohre erfolgt somit in vorteilhafter Weise gleitend von Raumtemperatur bis zur Verzinkungstemperatur im Zinkbad von ca. 450 - 560 "C.The finned tubes are thus heated in an advantageous manner, sliding from room temperature to the galvanizing temperature in the zinc bath of approximately 450-560 "C.

Das Gesamtsystem arbeitet unter Schutzgasatmosphäre, wodurch eine Oxidation der Rippenrohre in der Vorwärmzone 6 verhindert wird. Als Inertgas wird vorzugsweise Stickstoff mit einem Wasserstoffanteil von ca. 10 % eingesetzt.The entire system works in a protective gas atmosphere, which prevents oxidation of the finned tubes in the preheating zone 6. Nitrogen with a hydrogen content of approximately 10% is preferably used as the inert gas.

Die Verzinkung der Rippenrohre erfolgt ebenfalls unter Schutzgasatmosphäre 17 im Temperaturbereich von ca. 450 - 560 *C emissions- und reststofffrei.The finned tubes are also galvanized in a protective gas atmosphere 17 in the temperature range of approx. 450 - 560 * C free of emissions and residues.

Hierbei werden die Rippenrohre in dem in besonderer Weise ausgebildeten Verzinkungsofen 7 mit Chargierbereich 20 sowie Schmelzbereich mit Verzinkungspfanne 12 mittels Zinkpumpe 16 mit Zink 18, 19 überflutet. Die Verzinkungspfanne 12 ist im Einlauf- und Auslaufbereich mit einer Führung versehen. Die besondere Anordnung der Verzinkungspfanne 12 im Verzinkungsofen 7 verhindert bei Betriebsniveau der Zinklegierung weitestgehend Leckageverluste der Schutzgasatmosphäre 17. Das aus der Verzinkungspfanne 12 mit dem Rippenrohr ausgetragene Zink 18, 19 wird mittels einer Abblasdüse 13 bzw. mech. Abstreif-/ Rütteleinrichtung senkrecht abgeblasen bzw. entfernt. Das Auftreten von Brückenbildungen zwischen den Rippenrohrlamellen und die Bildung einer Ablaufkante ist wirksam unterbunden.Here, the finned tubes are flooded with zinc 18, 19 in the specially designed galvanizing furnace 7 with charging area 20 and melting area with galvanizing pan 12 by means of a zinc pump 16. The galvanizing pan 12 is provided with a guide in the inlet and outlet area. The special arrangement of the galvanizing pan 12 in the galvanizing furnace 7 largely prevents leakage losses of the protective gas atmosphere 17 at the operating level of the zinc alloy. The zinc 18, 19 discharged from the galvanizing pan 12 with the finned tube is removed by means of a blow-off nozzle 13 or mech. Wiped off or removed the scraper / vibrator vertically. The occurrence of bridges between the finned tube fins and the formation of a drainage edge is effectively prevented.

Der temporäre Korrosionsschutz ist durch die Chromatierung gegeben.The temporary corrosion protection is provided by the chromating.

Der Verzinkungsofen 7 besteht aus einem Gehäuse mit Feuerfestauskleidung 11, wobei unterhalb der Abblasdüse 13 ein Zinkauffangbehälter 14 angeordnet ist.The galvanizing furnace 7 consists of a housing with a refractory lining 11, a zinc collecting container 14 being arranged below the blow-off nozzle 13.

Selbstverständlich soll das Verfahren und die Einrichtung nach der Erfindung auch die Verwendung von Zink- oder anderen Metall-Legierungen beinhalten sowie die Möglichkeit der Flußmittelbehandlung. Die Flußmittelbehandlung wird der Behandlungsstufe 5 nachgeschaltet.Of course, the method and the device according to the invention should also include the use of zinc or other metal alloys and the possibility of flux treatment. The flux treatment is followed by treatment level 5.

Das Aufbringen des Fluxmediums erfolgt analog der Behandlungsstufen Entfetten 2, Spülen 3, Beizen 4, Spülen 5, Kühlen 8 und Chromatieren 9. Um Austragungsverluste zu vermeiden, wird das aufgebrachte Flußmittel abgeblasen.The flux medium is applied analogously to the treatment stages degreasing 2, rinsing 3, pickling 4, rinsing 5, cooling 8 and chromating 9. In order to avoid loss of discharge, the applied flux is blown off.

Die Erwärmung der in dieser Weise vorbehandelten Rippenrohre erfolgt in der indirekt gasbeheizten Vorwärmstrecke 6, die aus mehreren Ofensegmenten mit Einzelsteuerung zusammengesetzt ist.The finned tubes pretreated in this way are heated in the indirectly gas-heated preheating section 6, which is composed of several furnace segments with individual controls.

Die Erwärmung der Rippenrohre erfolgt somit in vorteilhafter Weise, gleitend von Raumtemperatur bis auf ca. 150 "C.The finned tubes are thus heated in an advantageous manner, sliding from room temperature to approximately 150 "C.

Das Gesamtsystem arbeitet unter Schutzgasatmosphäre, wodurch eine Oxidation der Rippenrohre in der Vorwärmzone 6 verhindert wird. Als Inertgas wird vorzugsweise Stickstoff eingesetzt.The entire system works in a protective gas atmosphere, which prevents oxidation of the finned tubes in the preheating zone 6. Nitrogen is preferably used as the inert gas.

Die Verzinkung der Rippenrohre erfolgt ebenfalls unter Schutzgasatmosphäre 17 im Temperaturbereich von ca. 450 - 560 *C.The finned tubes are also galvanized in a protective gas atmosphere 17 in the temperature range of approx. 450 - 560 * C.

Claims (11)

1. Verfahren zum Feuerverzinken von Rippenrohren, wobei die Rippenrohre unterschiedlicher Geometrie vorbehandelt werden, d. h., vorher entfettet, gebeizt, gespült usw. werden und dann zum überziehen mit geschmolzenem Zink oder einer Zinklegierung in ein Verzinkungsbad getaucht werden, dadurch gekennzeichnet, daß die Rippenrohre automatisch mittels Transporteinrichtung, bestehend aus horizontal und vertikal angebrachten Stütz-, Führungs- und Treibrollen bzw. Transportkette im Vorwärmbereich auf einem Behandlungsniveau die Behandlungsstufen, die Entfettungs-, Spül-, Beiz-, Wärm-, Verzinkungs-, Kühl-, Trocken-, Chromatierungs- und Abblas-/mech. Abstreif-/Rüttelstufen beinhalten, - nacheinander durchlaufen, wobei die Rippenrohre in der Verzinkungsstufe in einem Verzinkungsofen überflutet werden.1. Process for hot-dip galvanizing finned tubes, the finned tubes of different geometries being pretreated, d. i.e., degreased, pickled, rinsed, etc. beforehand and then immersed in a galvanizing bath for coating with molten zinc or a zinc alloy, characterized in that the finned tubes are automatically conveyed by means of a transport device consisting of horizontally and vertically attached supporting, guiding and Driving rollers or transport chain in the preheating area at a treatment level the treatment stages, the degreasing, rinsing, pickling, heating, galvanizing, cooling, drying, chromating and blow-off / mech. Stripping / vibrating stages include, - run through one after the other, the finned tubes in the galvanizing stage being flooded in a galvanizing furnace. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Aufbringen der Behandlungsmedien im Bereich Entfetten, Spülen, Beizen, Spülen, Kühlen, Chromatieren im Spritzverfahren über Düsen in geschlossenen Behältern erfolgt, wobei das anhaftende Medium mittels Druckluftdüsen abgeblasen wird.2. The method according to claim 1, characterized in that the application of the treatment media in the area of degreasing, rinsing, pickling, rinsing, cooling, chromating is carried out by spraying via nozzles in closed containers, the adhering medium being blown off by means of compressed air nozzles. 3. Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Rippenrohre in einem indirekt gasbeheizten Vorwärmofen mit Ein- und Auslaufschleusen unter Schutzgasatmosphäre gleitend von Raumtemperatur auf Verzinkungstemperatur von ca. 450 - 560 °C erwärmt werden.3. Process according to claims 1 and 2, characterized in that the finned tubes are heated in an indirectly gas-heated preheating furnace with inlet and outlet locks under a protective gas atmosphere sliding from room temperature to a galvanizing temperature of approximately 450-560 ° C. 4. Verfahren nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß das vorgewärmte Rippenrohr automatisch dem induktiv-beheizten Verzinkungsofen zugeführt und durch überfluten mittels Zink unter Schutzgasatmosphäre emissions- und reststofffrei verzinkt wird, wobei die Zinktemperatur und die Behandlungszeit/Durchlaufgeschwindigkeit individuell geregelt werden.4. The method according to claims 1 to 3, characterized in that the preheated finned tube is automatically fed to the induction-heated galvanizing furnace and is galvanized by flooding by means of zinc under a protective gas atmosphere free of emissions and residues, the zinc temperature and the treatment time / throughput speed being regulated individually. 5. Verfahren nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß das mit Zink überflutete Rippenrohr automatisch der Abblasdüse bzw. der mechanischen Abstreif-/Rütteleinrichtung zugeführt wird, in der Zink tropfenfrei entfernt wird.5. The method according to claims 1 to 4, characterized in that the finned tube flooded with zinc is automatically fed to the blow-off nozzle or the mechanical stripping / vibrating device, in which zinc is removed drop-free. 6. Verfahren nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß das verzinkte Rippenrohr automatisch einer Luft-/Wasser-Kühlstrecke zugeführt wird, in der eine gleitende Abkühlung des Rippenrohres vorgenommen wird von Verzinkungstemperatur auf Raumtemperatur dergestalt, daß über Düsen Wasser und Druckluft aufgeblasen werden.6. The method according to claims 1 to 5, characterized in that the galvanized finned tube is automatically fed to an air / water cooling section, in which a sliding cooling of the finned tube is carried out from galvanizing temperature to room temperature such that water and compressed air are blown up via nozzles will. 7. Verfahren nach den Ansprüchen 1 bis 6, dadurch gekennzeichnet, daß das abgekühlte Rippenrohr automatisch dem Chromatierungsbad zugeführt wird und hier das Chromatierungsmedium mittels Düse aufgesprüht wird.7. The method according to claims 1 to 6, characterized in that the cooled finned tube is automatically fed to the chromating bath and here the chromating medium is sprayed on by means of a nozzle. 8. Verfahren nach den Ansprüchen 1 bis 7, dadurch gekennzeichnet, daß das chromatierte Rippenrohr automatisch der Entnahmevorrichtung zugeführt wird.8. The method according to claims 1 to 7, characterized in that the chromated finned tube is automatically fed to the removal device. 9. Einrichtung zur Durchführung des Verfahrens nach den Ansprüchen 1 bis 8 zum Feuerverzinken von Rippenrohren unterschiedlicher Geometrie mit den Anlagenkomponenten Beschickungseinrichtung, Entfettungseinrichtung mit Abblaseeinrichtung für Entfettungsmedium, Spüleinrichtng mit Abblaseinrichtung für Spülmedium, Beizeinrichtung mit Abblaseinrichtung für Beizmedium, Spüleinrichtung mit Abblaseinrichtung für Spülmedium, Vorwärmofen, Verzinkungsofen mit Abblas-/mech. Abstreif-/Rütteleinrichtung für Zink, Kühl- und Trockeneinrichtung, Chromatierungseinrichtung mit Abblaseinrichtung für Chromatierungs-Medium, Entnahmeeinrichtung, Transportsystem, dadurch gekennzeichnet, daß die Anlagenkomponenten (1 - 10) in Linie hintereinander angeordnet sind.9. Device for carrying out the method according to claims 1 to 8 for hot-dip galvanizing finned tubes of different geometries with the system components loading device, degreasing device with blow-off device for degreasing medium, flushing device with blow-off device for flushing medium, Pickling device with blow-off device for pickling medium, rinsing device with blow-off device for rinsing medium, preheating furnace, galvanizing furnace with blow-off / mech. Wiping / vibrating device for zinc, cooling and drying device, chromating device with blow-off device for chromating medium, removal device, transport system, characterized in that the system components (1 - 10) are arranged in line one behind the other. 10. Einrichtung nach Anspruch 9, dadurch gekennzeichnet, daß der Verzinkungsofen (7) zur Aufnahme einer Legierung aus geschmolzenem Zink (18, 19) aus Schmelzbereich mit Verzinkungspfanne (12) und Zink-Chargierbereich (20) besteht, wobei das geschmolzene Zink (18) aus dem Schmelzbereich mittels Zinkpumpe (16) in die über dem Schmelzbereich angeordnete Verzinkungspfanne (12) mit Überlauf pumpbar ist.10. The device according to claim 9, characterized in that the galvanizing furnace (7) for receiving an alloy of molten zinc (18, 19) from the melting area with galvanizing pan (12) and zinc charging area (20), wherein the molten zinc (18th ) can be pumped from the melting area by means of a zinc pump (16) into the galvanizing pan (12) with overflow arranged above the melting area. 11. Einrichtung nach Anspruch 10, dadurch gekennzeichnet, daß die Verzinkungspfanne (12), bedingt durch das Niveau des geschmolzenen Metalles, die Schutzgasatmosphäre (17) im Schmelzbereich gegenüber der Normalatmosphäre abdichtet.11. The device according to claim 10, characterized in that the galvanizing pan (12), due to the level of the molten metal, seals the protective gas atmosphere (17) in the melting range from the normal atmosphere.
EP84112869A 1983-11-11 1984-10-25 Method and apparatus for galvanizing ribbed tubes Expired EP0142082B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84112869T ATE43646T1 (en) 1983-11-11 1984-10-25 METHOD AND EQUIPMENT FOR HOT-DIP GALVANIZING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3340813 1983-11-11
DE3340813 1983-11-11

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EP0142082A2 true EP0142082A2 (en) 1985-05-22
EP0142082A3 EP0142082A3 (en) 1985-08-21
EP0142082B1 EP0142082B1 (en) 1989-05-31

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EP (1) EP0142082B1 (en)
JP (1) JPS60169568A (en)
AT (1) ATE43646T1 (en)
AU (2) AU3529884A (en)
BR (1) BR8405749A (en)
DD (1) DD231085A1 (en)
DE (2) DE3409935C1 (en)
ES (1) ES8605865A1 (en)
GR (1) GR80858B (en)
IN (1) IN163652B (en)
YU (2) YU187484A (en)
ZA (1) ZA848756B (en)

Cited By (2)

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EP0635317A1 (en) * 1993-07-24 1995-01-25 Durferrit GmbH Thermotechnik Apparatus for washing and/or heat-treating workpieces, in particular profile strips
EP0826788A1 (en) * 1996-08-30 1998-03-04 Balcke-Dürr GmbH Galvanizing method

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
DE3720965A1 (en) * 1987-06-25 1989-01-05 Solms Juergen Process and appliance for continuous hot galvanising of elongated articles to be galvanised
DE3935146A1 (en) * 1989-09-06 1991-03-21 Wirtz Gmbh & Co Continuous hot dip zinc coating of rubber tubing - where tube sections are joined together and passed through pretreatment baths, zinc bath and cut
JPH04321895A (en) * 1991-04-19 1992-11-11 Nichias Corp Fluid heating pipe
DE4325452A1 (en) * 1993-07-29 1995-04-06 Theodor Willecke Process and apparatus for hot-dip galvanising iron parts
DE10320071A1 (en) * 2003-05-05 2004-12-02 Basf Ag Esters of phosphorus-oxygen acids containing alkoxy groups and their use as corrosion inhibitors
DE102016106617A1 (en) * 2016-03-21 2017-09-21 Fontaine Holdings Nv Hot-dip galvanizing plant and hot-dip galvanizing process
CN112481570A (en) * 2019-09-12 2021-03-12 西藏中驰集团股份有限公司 Novel galvanizing process flow and assembly line used by same

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GB1433019A (en) * 1973-06-26 1976-04-22 Turner Lisle Ltd Galvanizing plant
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EP0635317A1 (en) * 1993-07-24 1995-01-25 Durferrit GmbH Thermotechnik Apparatus for washing and/or heat-treating workpieces, in particular profile strips
EP0826788A1 (en) * 1996-08-30 1998-03-04 Balcke-Dürr GmbH Galvanizing method

Also Published As

Publication number Publication date
YU187484A (en) 1988-04-30
AU2779089A (en) 1989-04-27
ATE43646T1 (en) 1989-06-15
ZA848756B (en) 1985-07-31
YU146186A (en) 1988-06-30
ES537521A0 (en) 1985-12-16
IN163652B (en) 1988-10-22
BR8405749A (en) 1985-09-17
DE3478474D1 (en) 1989-07-06
AU3529884A (en) 1985-05-16
EP0142082A3 (en) 1985-08-21
EP0142082B1 (en) 1989-05-31
DE3409935C1 (en) 1985-04-18
ES8605865A1 (en) 1985-12-16
GR80858B (en) 1985-02-27
DD231085A1 (en) 1985-12-18
JPS60169568A (en) 1985-09-03

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