EP0708186A1 - Process and apparatus for continuous surface treatment, in particular for pickling and cleaning strip - Google Patents

Process and apparatus for continuous surface treatment, in particular for pickling and cleaning strip Download PDF

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Publication number
EP0708186A1
EP0708186A1 EP95114997A EP95114997A EP0708186A1 EP 0708186 A1 EP0708186 A1 EP 0708186A1 EP 95114997 A EP95114997 A EP 95114997A EP 95114997 A EP95114997 A EP 95114997A EP 0708186 A1 EP0708186 A1 EP 0708186A1
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EP
European Patent Office
Prior art keywords
pickling
treatment liquid
nozzles
treatment
liquid
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Granted
Application number
EP95114997A
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German (de)
French (fr)
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EP0708186B1 (en
Inventor
Michael Zednicek
Wilhelm Hofkirchner
Wilhelm Dr. Karner
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Andritz Patentverwaltungs GmbH
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Andritz Patentverwaltungs GmbH
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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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
    • C23G3/021—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by dipping
    • 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 continuous surface treatment, in particular for pickling and cleaning strips, for example metal strips, in particular steel strips, in a treatment chamber, the web running in an approximately horizontal path through the treatment chamber and a treatment liquid, in particular pickling liquid, being fed to the treatment chamber becomes.
  • the invention further relates to a device for carrying out the method.
  • the aim of the present invention is to increase the treatment effectiveness, especially in the case of pickling, in order to significantly reduce the length of the apparatus or apparatus costs for a corresponding system or to reduce the treatment temperature and thereby the operating costs.
  • the invention is therefore characterized in that the surface to be treated is exposed to an increased shear force to the treatment liquid, in particular pickling liquid. This increased shear force reduces the liquid boundary layer on the strip surface, which results in an increased pickling effect and the pickling time is reduced.
  • a further development of the method according to the invention is characterized in that fresh treatment liquid, in particular pickling liquid, is supplied in the area of application of the increased shear force and the treatment liquid is swirled in this area.
  • fresh treatment liquid in particular pickling liquid
  • the supply of the treatment liquid, in particular the pickling acid, directly in the area of the application of the increased shear force and in the most swirled liquid area ensures a rapid introduction of the pickling acid to the belt, which causes a further increased pickling intensity.
  • a favorable further development of the invention is characterized in that the amount of the treated liquid is regulated, whereby the amount of treatment liquid supplied can be regulated alone or in combination with the quantity.
  • the pickling effect can be varied according to the requirements.
  • An advantageous embodiment of the invention is characterized in that the surface to be treated is fixed in position by the treatment liquid, in particular centered in devices for increasing the shear force. Due to the fixation, in particular centering, of the belt, ground contact and the associated generation of scratches in the belt can be avoided.
  • the invention also relates to a device for continuous surface treatment, in particular for pickling and cleaning strips, for example metal strips, in particular steel strips, with a treatment chamber, the web running through the treatment chamber in an approximately horizontal path, and is primarily characterized in that in particular several devices in the treatment chamber, in particular pickling tub, are provided which achieve an increase in the shear force between the belt and the treatment liquid. This increased shear force reduces the liquid boundary layer, which results in an increased pickling effect.
  • a favorable further development of the invention is characterized in that the devices have an area with a continuously narrowing cross-section when viewed in the direction of tape travel.
  • This constricting cross-section which has, for example, the shape of a Venturi nozzle, allows a good swirling of the liquid and thus a Increase in pickling intensity can be caused.
  • the belt is centered in height by means of such a device, in particular also centered in the Venturi module, thereby avoiding contact with the ground and the associated generation of scratches on the belt surface.
  • An advantageous embodiment of the invention is characterized in that nozzles are provided in the area of the devices for introducing in particular fresh treatment liquid. If treatment liquid is injected in the area of the devices, on the one hand the liquid is swirled through even more, whereby on the other hand the acid, which is particularly fresh, is rapidly brought up to the strip, which causes an increased pickling intensity.
  • a favorable further development of the invention is characterized in that the nozzles are arranged after the device, as seen in the direction of travel of the belt, and these can also, if necessary additionally, be arranged before or in the device.
  • the treatment medium is supplied in an area of increased fluid which is swirled through, an injection in front of the device in this area causing additional swirling and thus improved pickling intensity.
  • An arrangement of the nozzles in the device supports the hydrodynamic effect of the device and prevents the belt from touching the device even at low speeds. Especially a combination of all arrangements leads to an optimal pickling intensity.
  • An advantageous embodiment of the invention is characterized in that the nozzles are arranged below the material web, wherein the nozzles can alternatively or in combination be arranged above the material web.
  • the nozzles can have openings pointing in the direction of tape travel or openings pointing in the direction of tape travel.
  • the pickling effect can also be influenced favorably by a suitable arrangement and alignment of the nozzles.
  • a favorable development of the invention is characterized in that at least one discharge line for treatment liquid is provided, which is connected to nozzles for supplying treatment liquid at at least one point in the treatment chamber.
  • An advantageous development of the invention is characterized in that at least one pump is connected between the discharge line and the supply line.
  • the circulating volume can be adjusted accordingly and the exit speed from the nozzles can be adjusted accordingly for an optimal pickling effect.
  • a favorable embodiment of the invention is characterized in that at least one heat supply device, in particular a heat exchanger, is connected between the discharge and supply of the treatment liquid.
  • a heat exchanger in the additional acid circuit, the temperature distribution in the pickling tank can be influenced particularly well, in particular a strong equalization of the temperature can be achieved.
  • FIG. 1 shows a pickling section according to the invention
  • FIG. 2 shows a section from FIG. 1
  • FIGS. 2a, 2b and FIG. 3 shows an analog section from FIG. 1
  • FIG 4a the pressure distribution in the area of a device provided according to the invention
  • FIG. 4b the speed distribution in the area of a device provided according to the invention
  • FIG. 5 shows the flow in the area of a device provided according to the invention.
  • Fig. 1 shows the diagram of a pickling section 1, which is shown for the sake of clarity without a cover of the system usually arranged.
  • the steel strip 2 to be pickled moves in the direction 3.
  • an inlet area 4 with squeeze rollers 5.5 ' the strip is guided through the pickling section 1 to an outlet area 6 with squeeze rollers 7 and 7'.
  • nozzles 9 are provided for supplying pickling acid.
  • the pickling acid is generally passed at the inlet 4 and / or outlet 6 via nozzle bars 10 into the pickling section 1 and used pickling acid is returned to the circulation tank 12 via outlets 11, 11 '.
  • the pickling acid is passed through a filter 13 to a pump 14 and from there through a heat exchanger 15, from where it is fed to the nozzle bar 10 via lines 16, 16 '.
  • pickling liquid is drained off at one or more points of the pickling section 1 (17, 17 ') and through a filter 18, 18' via a pump 19, 19 'and through a heat exchanger 20, 20' the nozzles 9 for reinforcement given up.
  • FIG. 2 shows a detail from FIG. 1, in which two Venturi modules, each with an upper part 8 'and a lower part 8' ', are shown. Between these two parts 8 'and 8' 'of the Venturi modules 8, the belt 2 is guided in the direction 3 and centered in height, so that contact with the ground and the associated generation of scratches in belt 2 is avoided. In the area behind the Venturi modules 8, nozzles 9 are provided, through which pickling acid is injected in the direction of the strip. The acid level is marked with 21.
  • FIG. 2a and 2b show an analogous section from FIG. 1, the nozzles 9 being arranged in the direction 3 of the strip travel of the metal strip 2 in front of or in the venturi modules 8, in contrast to FIG. 2.
  • these variants can also be combined, as shown by way of example in FIG. 3, the alignment of the nozzles being able to cause outflow both in and against the strip running direction 3.
  • the position of the metal strip 2 in the Venturi module 8 can be adjusted by a different distribution of the quantity of the pickling liquid flowing out between the underside and the upper side of the strip 2.
  • FIG 4a shows the pressure profile 22 in area A of the cross-sectional constriction between the upper part 8 'and lower part 8''of the Venturi module 8.
  • the pressure increases from the entry into the Venturi module 8 and reaches approximately at the end of this section A the maximum value, from where the pressure is completely reduced again shortly after the Venturi module 8. Due to the symmetrical formation of the pressure curve in the Venturi module 8, the band 2 is centered in the module.
  • FIG. 4b shows, analogously to FIG. 4a, the speed curve in the area of a Venturi module 8. Due to the decreasing cross section in area A of the Venturi module 8, starting from a speed profile 23 via a profile 23 ', the acid is accelerated to a profile 23 ''.
  • FIG. 5 now shows the flow conditions in the area of a Venturi module 8, the flow direction being designated 24 at the inlet into the Venturi module 8 and a turbulent vortex flow 25 being recognizable in the area of the outlet of the module 8.
  • fresh treatment medium is supplied via the nozzles 9, which ensures that the fresh acid is brought up to the belt quickly, which causes an increased pickling intensity.
  • the invention is not limited by the embodiments shown, in particular the nozzles can also be directed in the tape running direction or against the tape running direction.
  • a cover can also be provided over the pickling section.
  • several separate pickling acid cycles can be provided within a pickling section, or several pickling sections can also be arranged one behind the other.

Abstract

Continuous surface treatment process, esp. for etching and cleaning of strip, e.g metal esp. steel strip, in which the strip passes approximately horizontally through a treatment chamber supplied with a treatment liquid, esp. etching liquid, and the surface to be treated is subjected to an increased shear force between the surface and treatment liquid. Process equipment is also claimed.

Description

Die Erfindung betrifft ein Verfahren zur kontinuierlichen Oberflächenbehandlung, insbesondere zum Beizen und Reinigen von Bändern, beispielsweise Metall-, insbesondere Stahlbändern, in einer Behandlungskammer, wobei die Bahn in einer etwa horizontalen Wegbahn durch die Behandlungskammer läuft und der Behandlungskammer eine Behandlungsflüssigkeit, insbesondere Beizflüssigkeit, zugeführt wird. Weiters betrifft die Erfindung eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for continuous surface treatment, in particular for pickling and cleaning strips, for example metal strips, in particular steel strips, in a treatment chamber, the web running in an approximately horizontal path through the treatment chamber and a treatment liquid, in particular pickling liquid, being fed to the treatment chamber becomes. The invention further relates to a device for carrying out the method.

Es sind verschiedene Systeme zur Oberflächenbehandlung, insbesonders von Beizen, von kontinuierlich durchlaufenden Bändern bekannt, wobei die Bänder im Wesentlichen horizontal durch den Behälter und das Behandlungsmedium geführt werden. Die Zufuhr des Behandlungsmediums, insbesondere Beizsäure, erfolgt im Allgemeinen am Eintritt bzw. Austritt des Bandes aus der Behandlungskammer, wodurch zusätzlich eine Dichtung der Behandlungskammer von der Umgebung erfolgt, sowie auch seitlich in die Behandlungskammer. All diese Systeme weisen jedoch eine ungenügende Beizwirkung auf, wodurch für eine gegebene Durchsatzmenge bei entsprechenden Qualitätsanforderungen meist recht lange und entsprechend kostenintensive Vorrichtungen erforderlich sind.Various systems for surface treatment, in particular pickling, of continuously moving belts are known, the belts being guided essentially horizontally through the container and the treatment medium. The treatment medium, in particular pickling acid, is generally supplied at the entry or exit of the strip from the treatment chamber, which additionally seals the treatment chamber from the environment and also laterally into the treatment chamber. All of these systems, however, have an insufficient pickling effect, which means that a given throughput quantity with corresponding quality requirements usually requires quite long and correspondingly expensive devices.

Die vorliegende Erfindung hat zum Ziel, die Behandlungseffektivität, speziell bei Beizen, zu erhöhen um Apparatelängen bzw. Apparatekosten für eine entsprechende Anlage wesentlich zu reduzieren bzw. die Behandlungstemperatur und dadurch die Betriebskosten zu reduzieren.The aim of the present invention is to increase the treatment effectiveness, especially in the case of pickling, in order to significantly reduce the length of the apparatus or apparatus costs for a corresponding system or to reduce the treatment temperature and thereby the operating costs.

Die Erfindung ist daher dadurch gekennzeichnet, daß die zu behandelnde Oberfläche einer erhöhten Scherkraft zur Behandlungsflüssigkeit, insbesondere Beiz-flüssigkeit, ausgesetzt wird. Diese erhöhte Scherkraft verringert die Flüssigkeitsgrenzschicht an der Bandoberfläche woraus eine erhöhte Beizwirkung resultiert und die Beizzeit reduziert wird.The invention is therefore characterized in that the surface to be treated is exposed to an increased shear force to the treatment liquid, in particular pickling liquid. This increased shear force reduces the liquid boundary layer on the strip surface, which results in an increased pickling effect and the pickling time is reduced.

Eine Weiterbildung des erfindungsgemäßen Verfahrens ist dadurch gekennzeichnet, daß im Bereich der Aufbringung der erhöhten Scherkraft, frische Behandlungsflüssigkeit, insbesondere Beizflüssigkeit, zugeführt und in diesem Bereich die Behandlungsflüssigkeit verwirbelt wird. Die Zufuhr der Behandlungsflüssigkeit, insbesondere der Beizsäure, unmittelbar im Bereich der Aufbringung der erhöhten Scherkraft und im am meisten durchwirbelten Flüssigkeitsbereich gewährleistet eine rasche Heranführung der Beizsäure an das Band, was eine weitere erhöhte Beizintensität bewirkt.A further development of the method according to the invention is characterized in that fresh treatment liquid, in particular pickling liquid, is supplied in the area of application of the increased shear force and the treatment liquid is swirled in this area. The The supply of the treatment liquid, in particular the pickling acid, directly in the area of the application of the increased shear force and in the most swirled liquid area ensures a rapid introduction of the pickling acid to the belt, which causes a further increased pickling intensity.

Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß die Zufuhr der behandelten Flüssigkeit in ihrer Menge geregelt wird, wobei die zugeführte Behandlungsflüssigkeit allein oder in Kombination mit der Menge geregelt werden kann. Durch die Variation der Menge und bzw. oder der Temperatur des Beizmediums läßt sich die Beizwirkung entsprechend den Erfordernissen variieren.A favorable further development of the invention is characterized in that the amount of the treated liquid is regulated, whereby the amount of treatment liquid supplied can be regulated alone or in combination with the quantity. By varying the amount and / or the temperature of the pickling medium, the pickling effect can be varied according to the requirements.

Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß die zu behandelnde Oberfläche durch die Behandlungsflüssigkeit in ihrer Lage fixiert, insbesondere in Einrichtungen zur Erhöhung der Scherkraft zentriert wird. Durch die Fixierung, insbesondere Zentrierung, des Bandes kann eine Bodenberührung und damit verbundene Erzeugung von Kratzern im Band vermieden werden.An advantageous embodiment of the invention is characterized in that the surface to be treated is fixed in position by the treatment liquid, in particular centered in devices for increasing the shear force. Due to the fixation, in particular centering, of the belt, ground contact and the associated generation of scratches in the belt can be avoided.

Die Erfindung betrifft ebenfalls eine Vorrichtung zur kontinuierlichen Oberflächenbehandlung, insbesonders zum Beizen und Reinigen von Bändern, beispielsweise Metall-, insbesondere Stahlbändern, mit einer Behandlungskammer, wobei die Bahn in einer etwa horizontalen Wegbahn durch die Behandlungskammer läuft, und ist vornehmlich dadurch gekennzeichnet, daß, insbesondere mehrere, Einrichtungen in der Behandlungskammer, insbesondere Beizbottich, vorgesehen sind, die eine Erhöhung der Scherkraft zwischen Band und Behandlungsflüssigkeit erzielen. Durch diese erhöhe Scherkraft wird die Flüssigkeitsgrenzschicht verringert, woraus eine erhöhte Beizwirkung resultiert.The invention also relates to a device for continuous surface treatment, in particular for pickling and cleaning strips, for example metal strips, in particular steel strips, with a treatment chamber, the web running through the treatment chamber in an approximately horizontal path, and is primarily characterized in that in particular several devices in the treatment chamber, in particular pickling tub, are provided which achieve an increase in the shear force between the belt and the treatment liquid. This increased shear force reduces the liquid boundary layer, which results in an increased pickling effect.

Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß die Einrichtungen in Bandlaufrichtung gesehen, einen Bereich mit sich kontinuierlich verengendem Querschnitt aufweisen. Durch diesen verengenden Querschnitt, der beispielsweise die Form einer Venturidüse aufweist, kann eine gute Durchwirbelung der Flüssigkeit und somit eine Erhöhung der Beizintensität bewirkt werden. Weiters wird durch eine derartige Einrichtung das Band höhenzentriert, insbesondere auch im Venturi-Modul mittenzentriert, wodurch eine Bodenberührung und die damit verbundene Erzeugung von Kratzern auf der Bandoberfläche vermieden wird.A favorable further development of the invention is characterized in that the devices have an area with a continuously narrowing cross-section when viewed in the direction of tape travel. This constricting cross-section, which has, for example, the shape of a Venturi nozzle, allows a good swirling of the liquid and thus a Increase in pickling intensity can be caused. Furthermore, the belt is centered in height by means of such a device, in particular also centered in the Venturi module, thereby avoiding contact with the ground and the associated generation of scratches on the belt surface.

Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß im Bereich der Einrichtungen Düsen zur Einbringung von insbesondere frischer Behandlungsflüssigkeit vorgesehen sind. Wird im Bereich der Einrichtungen Behandlungsflüssigkeit eingedüst, wird einerseits die Flüssigkeit noch stärker durchwirbelt, wodurch andererseits eine rasche Heranführung der insbesondere frischen Säure an das Band erfolgt, was eine erhöhte Beizintensität bewirkt.An advantageous embodiment of the invention is characterized in that nozzles are provided in the area of the devices for introducing in particular fresh treatment liquid. If treatment liquid is injected in the area of the devices, on the one hand the liquid is swirled through even more, whereby on the other hand the acid, which is particularly fresh, is rapidly brought up to the strip, which causes an increased pickling intensity.

Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß die Düsen in Bandlaufrichtung gesehen nach der Einrichtung angeordnet sind, wobei diese auch, gegebenenfalls zusätzlich, vor bzw. in der Einrichtung angeordnet sein können. Durch die Anordnung der Düsen nach der Einrichtung erfolgt die Zufuhr des Behandlungsmediums in einem Bereich erhöhter durchwirbelter Flüssigkeit, wobei eine Eindüsung vor der Einrichtung in diesem Bereich eine zusätzliche Verwirbelung und damit verbesserte Beizintensität bewirkt. Eine Anordnung der Düsen in der Einrichtung unterstützt die hydrodynamische Wirkung der Einrichtung und vermeidet die Berührung des Bandes mit der Einrichtung auch bei niedrigen Geschwindigkeiten. Speziell eine Kombination aller Anordnungen führt zu einem Optimum an Beizintensität.A favorable further development of the invention is characterized in that the nozzles are arranged after the device, as seen in the direction of travel of the belt, and these can also, if necessary additionally, be arranged before or in the device. By arranging the nozzles after the device, the treatment medium is supplied in an area of increased fluid which is swirled through, an injection in front of the device in this area causing additional swirling and thus improved pickling intensity. An arrangement of the nozzles in the device supports the hydrodynamic effect of the device and prevents the belt from touching the device even at low speeds. Especially a combination of all arrangements leads to an optimal pickling intensity.

Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß die Düsen unterhalb der Materialbahn angeordnet sind, wobei die Düsen auch alternativ bzw. in Kombination oberhalb der Materialbahn angeordnet sein können. Dabei können die Düsen in die Bandlaufrichtung weisende Öffnungen bzw. gegen die Bandlaufrichtung weisende Öffnungen aufweisen. Durch eine geeignete Anordnung und Ausrichtung der Düsen kann die Beizwirkung zusätzlich günstig beeinflußt werden.An advantageous embodiment of the invention is characterized in that the nozzles are arranged below the material web, wherein the nozzles can alternatively or in combination be arranged above the material web. The nozzles can have openings pointing in the direction of tape travel or openings pointing in the direction of tape travel. The pickling effect can also be influenced favorably by a suitable arrangement and alignment of the nozzles.

Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß zumindest eine Ableitung für Behandlungsflüssigkeit vorgesehen ist, die mit Düsen zur Zufuhr von Behandlungsflüssigkeit an zumindest einer Stelle in der Behandlungskammer verbunden ist. Durch diese Ausführung der Erfindung kann ein zusätzlicher Säurekreislauf erreicht werden, durch den eine Optimierung der Beize erzielt werden kann.A favorable development of the invention is characterized in that at least one discharge line for treatment liquid is provided, which is connected to nozzles for supplying treatment liquid at at least one point in the treatment chamber. With this embodiment of the invention, an additional acid cycle can be achieved, by means of which the pickling can be optimized.

Eine vorteilhafte Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß zwischen Ableitung und Zufuhr mindestens eine Pumpe geschaltet ist. Durch die Regelung einer Pumpe kann die Umwälzmenge entsprechend eingestellt und auch die Austrittsgeschwindigkeit aus den Düsen entsprechend für eine optimale Beizwirkung eingestellt werden.An advantageous development of the invention is characterized in that at least one pump is connected between the discharge line and the supply line. By regulating a pump, the circulating volume can be adjusted accordingly and the exit speed from the nozzles can be adjusted accordingly for an optimal pickling effect.

Eine günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß zwischen Ableitung und Zufuhr der Behandlungsflüssigkeit mindestens eine Wärmezufuhreinrichtung, insbesondere ein Wärmetauscher, geschaltet ist. Durch die Anordnung eines Wärmetauschers in den zusätzlichen Säurekreislauf läßt sich die Temperaturverteilung im Beizbottich besonders gut beeinflußen, wobei ins-besondere eine starke Vergleichmäßigung der Temperatur erzielt werden kann.A favorable embodiment of the invention is characterized in that at least one heat supply device, in particular a heat exchanger, is connected between the discharge and supply of the treatment liquid. By arranging a heat exchanger in the additional acid circuit, the temperature distribution in the pickling tank can be influenced particularly well, in particular a strong equalization of the temperature can be achieved.

Im folgenden wird die Erfindung nun anhand von Zeichnungen beispielhaft beschrieben, wobei Fig. 1 eine Beizsektion gemäß der Erfindung, Fig. 2 einen Ausschnitt aus Fig. 1, Fig. 2a, 2b und Fig. 3 einen analogen Ausschnitt aus Fig. 1, Fig. 4a die Druckverteilung im Bereich einer erfindungsgemäß vorgesehenen Einrichtung, Fig. 4b die Geschwindigkeitsverteilung im Bereich einer erfindungsgemäß vorgesehenen Einrichtung, Fig. 5 die Strömung im Bereich einer erfindungsgemäß vorgesehenen Einrichtung darstellt.The invention will now be described by way of example with reference to drawings, in which: FIG. 1 shows a pickling section according to the invention, FIG. 2 shows a section from FIG. 1, FIGS. 2a, 2b and FIG. 3 shows an analog section from FIG. 1, FIG 4a the pressure distribution in the area of a device provided according to the invention, FIG. 4b the speed distribution in the area of a device provided according to the invention, FIG. 5 shows the flow in the area of a device provided according to the invention.

Fig. 1 zeigt das Schema einer Beizsektion 1, das der besseren Übersichtlichkeit wegen ohne eine üblicherweise angeordnete Abdeckung der Anlage dargestellt ist. Das zu beizende Stahlband 2 bewegt sich in Richtung 3. Ausgehend von einem Einlaßbereich 4 mit Abquetschwalzen 5,5' wird das Band durch die Beizsektion 1 zu einem Auslaßbereich 6 mit Abquetschwalzen 7 und 7' geführt. In diesem Bereich sind mehrere Einrichtungen 8, die auch als Venturi-Modulen bezeichnet werden, angeordnet. Im Bereich dieser Venturi-Modulen 8 sind jeweils Düsen 9 zur Zufuhr von Beizsäure vorgesehen. Die Beizsäure wird grundsätzlich am Eintritt 4 und bzw. oder Austritt 6 über Düsenbalken 10 in die Beizsektion 1 geleitet und verbrauchte Beizsäure über Auslässe 11,11' in den Zirkulationstank 12 zurückgeführt. Vom Zirkulationstank 12 wird die Beizsäure über ein Filter 13 zu einer Pumpe 14 und von dort durch einen Wärmetauscher 15 geführt, von wo sie über Leitungen 16,16' den Düsenbalken 10 zugeführt wird. Zur besseren Regelung des Beizablaufes wird an ein oder mehreren Stellen der Beizsektion 1 Beizflüssigkeit abgeleitet (17,17') und durch ein Filter 18,18' über eine Pumpe 19,19' und durch einen Wärmetauscher 20,20' den Düsen 9 zur Verstärkung aufgegeben.Fig. 1 shows the diagram of a pickling section 1, which is shown for the sake of clarity without a cover of the system usually arranged. The steel strip 2 to be pickled moves in the direction 3. Starting from an inlet area 4 with squeeze rollers 5.5 ', the strip is guided through the pickling section 1 to an outlet area 6 with squeeze rollers 7 and 7'. There are several facilities in this area 8, which are also referred to as Venturi modules, arranged. In the area of these Venturi modules 8, nozzles 9 are provided for supplying pickling acid. The pickling acid is generally passed at the inlet 4 and / or outlet 6 via nozzle bars 10 into the pickling section 1 and used pickling acid is returned to the circulation tank 12 via outlets 11, 11 '. From the circulation tank 12, the pickling acid is passed through a filter 13 to a pump 14 and from there through a heat exchanger 15, from where it is fed to the nozzle bar 10 via lines 16, 16 '. For better control of the pickling process, pickling liquid is drained off at one or more points of the pickling section 1 (17, 17 ') and through a filter 18, 18' via a pump 19, 19 'and through a heat exchanger 20, 20' the nozzles 9 for reinforcement given up.

Fig. 2 zeigt einen Auschnitt aus Fig. 1, in dem zwei Venturi-Modulen mit jeweils einem oberen Teil 8' und einem unteren Teil 8'' dargestellt sind. Zwischen diesen beiden Teilen 8' bzw. 8'' der Venturi-Modulen 8 wird das Band 2 in die Richtung 3 geführt und höhenzentriert, sodaß eine Bodenberührung und damit verbundene Erzeugung von Kratzern in Band 2 vermieden wird. Im Bereich hinter den Venturi-Modulen 8 sind Düsen 9 vorgesehen, durch die Beizsäure in Richtung auf das Band eingedüst wird. Das Säureniveau ist mit 21 gekennzeichnet.FIG. 2 shows a detail from FIG. 1, in which two Venturi modules, each with an upper part 8 'and a lower part 8' ', are shown. Between these two parts 8 'and 8' 'of the Venturi modules 8, the belt 2 is guided in the direction 3 and centered in height, so that contact with the ground and the associated generation of scratches in belt 2 is avoided. In the area behind the Venturi modules 8, nozzles 9 are provided, through which pickling acid is injected in the direction of the strip. The acid level is marked with 21.

Fig. 2a und 2b zeigen einen analogen Ausschnitt aus Fig. 1, wobei hier im Gegensatz zu Fig. 2 die Düsen 9 in Richtung 3 des Bandlaufs des Metallbandes 2 vor bzw. in den Venturi-Modulen 8 angeordnet sind. Grundsätzlich können diese Varianten auch kombiniert werden, wie beispielhaft in Fig. 3 dargestellt, wobei die Ausrichtung der Düsen sowohl eine Ausströmung in als auch gegen die Bandlaufrichtung 3 bewirken kann. Durch eine unterschiedliche Mengenverteilung des auströmenden Beizflüssigkeit zwischen Unterseite und Oberseite des Bandes 2 kann die Lage des Metallbandes 2 im Venturi-Modul 8 eingestellt werden.2a and 2b show an analogous section from FIG. 1, the nozzles 9 being arranged in the direction 3 of the strip travel of the metal strip 2 in front of or in the venturi modules 8, in contrast to FIG. 2. In principle, these variants can also be combined, as shown by way of example in FIG. 3, the alignment of the nozzles being able to cause outflow both in and against the strip running direction 3. The position of the metal strip 2 in the Venturi module 8 can be adjusted by a different distribution of the quantity of the pickling liquid flowing out between the underside and the upper side of the strip 2.

Fig. 4a zeigt den Druckverlauf 22 im Bereich A der Querschnittsverengung zwischen dem oberen Teil 8' und unteren Teil 8'' des Venturi-Moduls 8. Der Druck nimmt vom Eintritt in den Venturi-Modul 8 zu und erreicht etwa am Ende dieses Abschnitts A den Maximalwert, von wo aus der Druck bis in einem Bereich kurz nach dem Venturi-Modul 8 wieder vollständig abgebaut wird. Durch die symmetrische Ausbildung des Druckverlaufes im Venturi-Modul 8 wird das Band 2 im Modul mittenzentriert.4a shows the pressure profile 22 in area A of the cross-sectional constriction between the upper part 8 'and lower part 8''of the Venturi module 8. The pressure increases from the entry into the Venturi module 8 and reaches approximately at the end of this section A the maximum value, from where the pressure is completely reduced again shortly after the Venturi module 8. Due to the symmetrical formation of the pressure curve in the Venturi module 8, the band 2 is centered in the module.

Fig. 4b zeigt analog zu Fig. 4a den Geschwindigkeitsverlauf im Bereich eines Venturi-Moduls 8. Durch den abnehmenden Querschnitt im Bereich A des Venturi-Moduls 8 erfolgt ausgehend von einem Geschwindigkeitsprofil 23 über ein Profil 23' eine Beschleunigung der Säure bis zu einem Profil 23''.4b shows, analogously to FIG. 4a, the speed curve in the area of a Venturi module 8. Due to the decreasing cross section in area A of the Venturi module 8, starting from a speed profile 23 via a profile 23 ', the acid is accelerated to a profile 23 ''.

Fig. 5 zeigt nunmehr die Strömungsverhältnisse im Bereich eines Venturi-Moduls 8, wobei am Einlauf in den Venturi-Modul 8 die Strömungsrichtung mit 24 bezeichnet ist und im Bereich des Auslaufs des Moduls 8 eine turbulente Wirbelströmung 25 erkennbar ist. In diesem Bereich der Wirbelströmung 25 wird über die Düsen 9 frisches Behandlungsmedium zugeführt, wodurch eine rasche Heranführung der frischen Säure an das Band gewährleistet wird, was eine erhöhte Beizintensität bewirkt.5 now shows the flow conditions in the area of a Venturi module 8, the flow direction being designated 24 at the inlet into the Venturi module 8 and a turbulent vortex flow 25 being recognizable in the area of the outlet of the module 8. In this region of the vortex flow 25, fresh treatment medium is supplied via the nozzles 9, which ensures that the fresh acid is brought up to the belt quickly, which causes an increased pickling intensity.

Die Erfindung ist nicht durch die dargestellten Ausführungen beschränkt, insbesondere können auch die Düsen in Bandlaufrichtung oder gegen die Bandlaufrichtung gerichtet sein. Es kann ebenfalls eine Abdeckhaube über der Beizsektion vorgesehen sein. Weiters können innerhalb einer Beizsektion mehrere separate Beizsäurenkreisläufe vorgesehen sein, bzw. auch mehrere Beizsektionen hintereinander angeordnet sein.The invention is not limited by the embodiments shown, in particular the nozzles can also be directed in the tape running direction or against the tape running direction. A cover can also be provided over the pickling section. Furthermore, several separate pickling acid cycles can be provided within a pickling section, or several pickling sections can also be arranged one behind the other.

Claims (19)

Verfahren zur kontinuierlichen Oberflächenbehandlung, insbesondere zum Beizen und Reinigen von Bändern, beispielsweise Metall-, insbesondere Stahlbändern, in einer Behandlungskammer, wobei die Bahn in einer etwa horizontalen Wegbahn durch die Behandlungskammer läuft, und der Behandlungskammer eine Behandlungsflüssigkeit, insbesondere Beizflüssigkeit, zugeführt wird, dadurch gekennzeichnet, daß die zu behandelnde Oberfläche einer erhöhten Scherkraft zur Behandlungsflüssigkeit, insbesondere Beizflüssigkeit, ausgesetzt wird.Process for continuous surface treatment, in particular for pickling and cleaning strips, for example metal, in particular steel strips, in a treatment chamber, the web running in an approximately horizontal path through the treatment chamber, and a treatment liquid, in particular pickling liquid, being fed to the treatment chamber, thereby characterized in that the surface to be treated is exposed to an increased shear force to the treatment liquid, in particular pickling liquid. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß im Bereich der Aufbringung der erhöhten Scherkraft, frische Behandlungsflüssigkeit, insbesondere Beizflüssigkeit zugeführt und in diesem Bereich die Behandlungsflüssigkeit verwirbelt wird.Method according to Claim 1, characterized in that fresh treatment liquid, in particular pickling liquid, is supplied in the area of application of the increased shear force and the treatment liquid is swirled in this area. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Zufuhr der Behandlungsflüssigkeit in ihrer Menge geregelt wird.A method according to claim 2, characterized in that the amount of the treatment liquid is regulated. Verfahren nach einem der Ansprüche 2 bis 3, dadurch gekennzeichnet, daß die zugeführte Behandlungsflüssigkeit in ihrer Temperatur geregelt wird.Method according to one of claims 2 to 3, characterized in that the temperature of the treatment liquid supplied is regulated. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die zu behandelnde Oberfläche durch die Behandlungsflüssigkeit in ihrer Lage eingestellt wird.Method according to one of claims 1 to 4, characterized in that the position of the surface to be treated is adjusted by the treatment liquid. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß die zu behandelnde Oberfläche in den zur Erhöhung der Scherkraft vorgesehenen Einrichtungen zentriert wird.A method according to claim 5, characterized in that the surface to be treated is centered in the devices provided for increasing the shear force. Vorrichtung zur kontinuierlichen Oberflächenbehandlung, insbesondere zum Beizen und Reinigen von Bändern, beispielsweise Metall-, insbesondere Stahlbändern, mit einer Behandlungskammer, wobei die Bahn in einer etwa horizontalen Wegbahn durch die Behandlungskammer läuft, dadurch gekennzeichnet, daß, insbesondere mehrere, Einrichtungen in der Behandlungskammer, insbesondere Beizbottich, vorgesehen sind, die eine Erhöhung der Scherkraft zwischen Band und Behandlungsflüssigkeit erzielen.Device for continuous surface treatment, in particular for pickling and cleaning of strips, for example metal, in particular steel strips, with a treatment chamber, the web running through the treatment chamber in an approximately horizontal path, characterized in that, in particular several Devices in the treatment chamber, in particular pickling tub, are provided which achieve an increase in the shear force between the belt and the treatment liquid. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Einrichtungen in Bandlaufrichtung gesehen einen Bereich mit sich kontinuierlich verengendem Querschnitt aufweisen.Apparatus according to claim 7, characterized in that the devices have an area with a continuously narrowing cross-section when viewed in the direction of the tape travel. Vorrichtung nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß im Bereich der Einrichtungen Düsen zur Einbringung von insbesondere frischer Behandlungsflüssigkeit vorgesehen sind.Apparatus according to claim 7 or 8, characterized in that nozzles are provided in the area of the devices for introducing in particular fresh treatment liquid. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß die Düsen in Bandlaufrichtung gesehen nach der Einrichtung angeordnet sind.Apparatus according to claim 9, characterized in that the nozzles are arranged after the device, as seen in the direction of strip travel. Vorrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß die Düsen in Bandlaufrichtung gesehen vor der Einrichtung angeordnet sind.Apparatus according to claim 9 or 10, characterized in that the nozzles are arranged in front of the device when viewed in the direction of tape travel. Vorrichtung nach einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, daß die Düsen in der Einrichtung vorgesehen sind.Device according to one of claims 9 to 11, characterized in that the nozzles are provided in the device. Vorrichtung nach einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, daß die Düsen unterhalb der Materialbahn angeordnet sind.Device according to one of claims 9 to 12, characterized in that the nozzles are arranged below the material web. Vorrichtung nach einem der Ansprüche 9 bis 13, dadurch gekennzeichnet, daß die Düsen oberhalb der Materialbahn angeordnet sind.Device according to one of claims 9 to 13, characterized in that the nozzles are arranged above the material web. Vorrichtung nach einem der Ansprüche 9 bis 14, dadurch gekennzeichnet, daß die Düsen in die Bandlaufrichtung weisende Öffnungen aufweisen.Device according to one of Claims 9 to 14, characterized in that the nozzles have openings which point in the direction of travel of the strip. Vorrichtung nach einem der Ansprüche 9 bis 14, dadurch gekennzeichnet, daß die Düsen gegen die Bandlaufrichtung weisende Öffnungen aufweisen.Device according to one of claims 9 to 14, characterized in that the nozzles have openings pointing counter to the tape running direction. Vorrichtung nach einem der Ansprüche 7 bis 16, dadurch gekennzeichnet, daß zumindest eine Ableitung für Behandlungsflüssigkeit vorgesehen ist, die mit Düsen zur Zufuhr von Behandlungsflüssigkeit an zumindest einer Stelle in der Behandlungskammer verbunden ist.Device according to one of claims 7 to 16, characterized in that at least one discharge line for treatment liquid is provided, which is connected to nozzles for supplying treatment liquid at at least one point in the treatment chamber. Vorrichtung nach Anspruch 17, dadurch gekennzeichnet, daß zwischen Ableitung und Zufuhr der Behandlungsflüssigkeit mindestens eine Pumpe geschaltet ist.Apparatus according to claim 17, characterized in that at least one pump is connected between the discharge and supply of the treatment liquid. Vorrichtung nach Anspruch 17 oder 18, dadurch gekennzeichnet, daß zwischen Ableitung und Zufuhr der Behandlungsflüssigkeit mindestens eine Wärmezufuhreinrichtung, insbesondere Wärmetauscher, geschaltet ist.Apparatus according to claim 17 or 18, characterized in that at least one heat supply device, in particular a heat exchanger, is connected between the discharge and supply of the treatment liquid.
EP95114997A 1994-10-17 1995-09-23 Process and apparatus for continuous surface treatment, in particular for pickling and cleaning strip Expired - Lifetime EP0708186B1 (en)

Applications Claiming Priority (3)

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AT1951/94 1994-10-17
AT195194 1994-10-17
AT0195194A AT404601B (en) 1994-10-17 1994-10-17 METHOD AND DEVICE FOR CONTINUOUS SURFACE TREATMENT, ESPECIALLY FOR STICKING AND CLEANING TAPES, EXAMPLE METAL, IN PARTICULAR STEEL TAPES

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AT (1) AT404601B (en)
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AT408765B (en) * 1999-03-05 2002-03-25 Andritz Ag Maschf PLANT FOR CONTINUOUS TREATMENT OF STEEL TAPES
US6260563B1 (en) 1999-05-20 2001-07-17 Danieli Technology, Inc. High speed pickling with recycling of acid
US6814089B1 (en) * 2003-06-03 2004-11-09 The Material Works, Ltd. Conditioning liquid cleaning and recycling system for sheet metal conditioning apparatus

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EP0708186B1 (en) 1999-06-16
TW309543B (en) 1997-07-01
DE59506218D1 (en) 1999-07-22
AT404601B (en) 1999-01-25
AU704013B2 (en) 1999-04-01
ATA195194A (en) 1998-05-15
FI954903A (en) 1996-04-18
RU2168562C2 (en) 2001-06-10
US5716455A (en) 1998-02-10
FI954903A0 (en) 1995-10-16
AU3426995A (en) 1996-05-02
KR100359322B1 (en) 2003-10-22
KR960014409A (en) 1996-05-22

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