EP2870268B1 - Method and device for avoiding surface defects caused by zinc dust in a continuous strip galvanising process - Google Patents

Method and device for avoiding surface defects caused by zinc dust in a continuous strip galvanising process Download PDF

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Publication number
EP2870268B1
EP2870268B1 EP13735251.4A EP13735251A EP2870268B1 EP 2870268 B1 EP2870268 B1 EP 2870268B1 EP 13735251 A EP13735251 A EP 13735251A EP 2870268 B1 EP2870268 B1 EP 2870268B1
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EP
European Patent Office
Prior art keywords
openings
furnace gas
injection
zinc
extraction
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EP13735251.4A
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German (de)
French (fr)
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EP2870268A1 (en
EP2870268B2 (en
Inventor
Norbert Schaffrath
Sabine Zeizinger
Michael Peters
Gernot Nothacker
Klaus Josef Peters
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel Europe AG
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Application filed by ThyssenKrupp Steel Europe AG filed Critical ThyssenKrupp Steel Europe AG
Priority to PL13735251T priority Critical patent/PL2870268T3/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • 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
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • 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
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • 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
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • 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
    • C23C2/40—Plates; Strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/002—Pretreatement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • B05D3/0236—Pretreatment, e.g. heating the substrate with ovens

Definitions

  • the invention relates to a method for avoiding caused by zinc dust surface defects in galvanized metal strip in a continuous strip galvanizing, in which heated in a continuous furnace metal strip is moved under inert gas through a furnace proboscis and immersed in a zinc bath, according to the preamble of claim 1. Further The invention relates to a device for preventing zinc dust-induced surface defects on galvanized metal strip in a continuous strip galvanizing, according to the preamble of claim 7.
  • a plant for the continuous galvanizing of steel strip consists inter alia of a continuous furnace, a zinc bath (molten bath), a device for adjusting the zinc coating thickness and a subsequent cooling device.
  • the steel strip is continuously annealed. Recrystallization of the steel sets the desired mechanical properties of the base material. In addition, iron oxides formed in a preheating zone are thereby reduced.
  • the strip is cooled under inert gas (HNX) to a temperature near the melt bath temperature.
  • HNX inert gas
  • the inert gas is intended to prevent the annealed strip from oxidizing prior to galvanizing, which would significantly degrade the adhesion of the zinc layer.
  • the protective gas containing connecting piece between annealing furnace and zinc bath is called oven proboscis.
  • JP 7157853 (A ) discloses a device for removing zinc vapor in a trunk of a continuous strip galvanizing plant.
  • the oven trunk is provided with injection openings (circulation openings) and suction openings arranged vertically underneath.
  • injection openings circulation openings
  • suction openings arranged vertically underneath.
  • a single injection opening is arranged in the trunk wall facing the upper side of the steel strip and a single suction opening is arranged vertically below it. Accordingly, in the underside of the steel strip facing trunk wall also a single injection opening and vertically below a single suction opening are arranged.
  • a single injection opening is arranged in a side wall of the trunk, while vertically below two suction openings are provided, which are formed as longitudinal slots in tubes, which Penetrate side wall of the trunk and extend on the top and bottom of the steel strip over the entire steel strip width.
  • the present invention has for its object to provide a method and an apparatus of the type mentioned, with or the recording of zinc vapor can be significantly minimized by the protective gas contained in the oven trunk and the propagation of zinc vapor in the oven trunk.
  • the upper and lower sides of the metal strip to be galvanized are also subjected to protective gas in the oven trunk via injection openings.
  • Protective gas laden with zinc vapor and / or zinc dust is sucked off via suction openings, which are arranged adjacent to the injection openings on both sides of the metal strip.
  • a plurality of the injection openings are formed in the manner and arranged in the oven-trunk that flows from these injection openings
  • the distance between the respective injection opening and at least one suction opening assigned to it are selected and the flow velocity of the protective gas emerging from the respective injection opening is controlled so that an entrainment of protective gas in the direction of the zinc bath occurring during movement of the metal or steel strip is counteracted.
  • the oven-trunk is provided with injection openings, via which the upper side and the underside of the metal strip can be acted upon with inert gas, wherein adjacent to the injection openings suction openings for sucking loaded with zinc vapor and / or zinc dust protective gas are arranged.
  • a plurality of the injection openings are formed in the manner and arranged in the oven trunk, that the protective gas flowing from these injection openings with an angle of incidence in the range of 70 ° to 110 °, preferably 80 ° to 100 °, particularly preferably about 90 ° is directed to the respective injection opening facing surface of the metal strip, wherein the distance between the respective injection opening and at least one associated suction opening is chosen so that at a predetermined or predetermined flow velocity of the exiting from the respective blowing gas shielding occurring during movement of the metal strip entrainment Protective gas is counteracted in the direction of the zinc bath.
  • the invention is based on the idea of influencing the flow conditions of the protective gas, in particular near the belt, in such a way that the abovementioned entrainment of protective gas is minimized and / or the condensation or resublimation of zinc vapor on the walls of the trench is prevented.
  • the object of the present invention to prevent the formation of protective gas loaded with zinc vapor in advance by minimizing the entrainment of the protective gas in the direction of zinc bath.
  • the invention proposes an interruption or blocking of the protective gas entrained by the metal strip (protective gas flow) by application of a gas lock or gas curtain effect.
  • An advantageous embodiment of the method according to the invention provides that the protective gas supplied via the injection openings is previously heated to a temperature of at least 500 ° C., preferably at least 550 ° C. This refinement makes it possible to more effectively prevent the resublimation of zinc dust in the oven trunk, since the heated protective gas stream supplied via the injection openings keeps the zinc vapor formed in the zinc bath surface in the gaseous state.
  • a preferred embodiment of the device according to the invention provides that the suction openings are connected to the injection openings via a return line having at least one exhaust fan, the return line having at least one heating device for heating the protective gas to a temperature of at least 500 ° C., preferably at least 550 ° C is provided.
  • the protective gas flow which is uniformly introduced into the trunk over the entire trunk width over a large area, simultaneously constitutes a heating medium for the blowing / suction device and prevents cold zones in the trunk which would lead to zinc dust precipitation. Due to the disclosed temperature control in the trunk area no sublimated zinc dust develops in the trunk. Rather, the zinc vapor contained in the protective gas is removed before it can sublime to dust grains.
  • the method according to the invention is carried out in such a way that the temperature of the gas cloud in the spatially higher part of the snout is higher than the temperature in the spatially deeper immersion region of the strip. This minimizes thermal turbulence in the trunk.
  • a further advantageous embodiment of the method according to the invention is characterized in that the blowing of inert gas through the injection openings and the suction of inert gas through the suction openings is performed in at least three stages, which are arranged consecutively in the strip running direction, each of the stages of a series of at least five, preferably at least seven injection openings and a series of at least five, preferably at least seven suction openings is formed.
  • a particularly effective blocking of the entrained by the galvanized tape inert gas can be achieved.
  • a preferred embodiment of the device according to the invention provides that the injection openings and the suction openings are formed in at least three stages, which are arranged consecutively in the strip running direction, each of the stages of a series of at least five, preferably at least seven injection openings and a Row of at least five, preferably at least seven suction openings is formed.
  • a further advantageous refinement of the method according to the invention is characterized in that the protective gas volume flow supplied via the injection openings is set equal to the protective gas volume flow extracted via the suction openings or is set to a value which is at most 5% below the aspirated inert gas volume flow.
  • the injection openings and the suction openings are arranged in a matrix. It is also advantageous in this context if the injection openings are offset relative to the suction openings - viewed in the strip running direction and over the strip width. Preferably, the injection openings and the suction openings of the device according to the invention are arranged uniformly spaced from one another.
  • the distance between the respective injection opening (injection nozzle) and the at least one associated suction opening is preferably less than / equal to 25 cm, in particular less than 15 cm, and particularly preferably less than / equal to 10 cm.
  • the protective gas stream is heated prior to injection by means of a gas heater, preferably to a temperature in the range from 450 to 600 ° C.
  • the abovementioned embodiment also causes a very uniform surface temperature distribution to be established on the pipeline system composed of the comb-shaped pipe structures during operation , where the surface temperature of the trunk
  • the arranged piping system is at a temperature in the range from 450 to 600 ° C. above the dew point or resublimation temperature of zinc.
  • the heating of the pipeline system with heated protective gas prevents the occurrence of punctual temperature peaks and thus undesired gas convection or gas turbulence.
  • a further advantageous embodiment of the device according to the invention provides that the comb-shaped Blasrohrgetrucke and the comb-shaped Saugrohrgesente are thermally insulated by a thermal insulation against the oven-trunk.
  • the oven trunk is heated to a temperature of at least 400 ° C, preferably at least 450 ° C, at least in a region extending from the zinc bath to the injection openings and / or suction openings.
  • this lower region of the furnace-trunk can also be provided with a thermal insulation. This makes it possible to achieve that the relevant walls or wall sections of the oven trunk are warmer than the temperature at which the condensation or resublimation of zinc vapor begins.
  • a furnace-trunk 1 a continuous strip galvanizing (hot dip galvanizing) is outlined.
  • a continuous strip galvanizing preferably steel strip
  • HNX protective gas
  • the band 2 dives obliquely down into the zinc bath 3 and is deflected by a arranged in a zinc bath roller 4 upwards.
  • the bath temperature is typically in the range of about 440 to 470 ° C.
  • the tape 2 'entrains a quantity of liquid zinc that is significantly above the desired coating thickness.
  • the still liquid excess coating material is stripped by means of extending over the bandwidth air jet flat nozzles 5 from the top and bottom (front and back) of the coated strip 2 '.
  • the trunk 1 In the oven trunk 1, part of the protective gas is entrained by the belt movement in the direction of the zinc bath 3. In order to prevent the entrained inert gas from absorbing zinc vapor on the zinc bath surface, which deposits on the colder inner wall surfaces of the trench 1 as zinc dust and can cause surface defects on the galvanized belt 2 'in larger pieces on the belt 2 and / or zinc bath 3 falls, the trunk 1 is provided with a special blow-suction device 6.
  • the blow-suction device 6 comprises a branched line system 7.1, 7.2 with a plurality of injection and suction 7.11, 7.21, by means of which inert gas in the end of the trunk 1, ie near the zinc bath 3, is circulated so that the tape from the second entrained inert gas stream is interrupted as possible, but without causing increased band vibrations.
  • the injection and suction openings 7.11, 7.21 are arranged in the direction of movement of the belt 2 so that each injection opening 7.11 is located in the vicinity of at least one suction opening 7.21, whereby injected inert gas sucked in the immediate vicinity again and thus an uncontrollable turbulence of the protective gas is prevented.
  • the blowing suction device 6 comprises an upper part 6.1 and a lower part 6.2, wherein the upper part 6.1 extends over the entire width of the band top side (front side), while the lower part 6.2 extends over the entire width of the band bottom side (back side).
  • the upper part 6.1 and the lower part 6.2 may each be box-shaped and accordingly be referred to as a blow-suction box or blow-suction boxes.
  • the respective blower suction box (6.1, 6.2) is divided by partitions 7.3 into a branched blow chamber 7.1 'with mutually parallel injection branches 7.10 and a branched suction chamber 7.2' with mutually parallel suction branches 7.20.
  • An injection branch 7.10 can lie directly next to a suction branch 7.20 in that both branches 7.10, 7.20 are separated from one another by the same partition 7.3.
  • the subdivision into a branched-off blow chamber 7.1 'and a branched suction chamber 7.2' can be realized, for example, by a meandering or folded partition 7.3 or by meandering partition walls, which are gas-tightly connected to one another at their abutting ends, as in FIG Fig. 5 outlined.
  • main chamber sections 7.4 7.5 open fittings 7.41, 7.51 for connecting at least one return line 8, which is connected to a suction fan, suction fan 9 or the like and defines a gas cycle or allows (see. Fig. 3 ).
  • the connecting piece 7.51 for extracting the protective gas is below the connecting piece 7.41, via which the protective gas is supplied, arranged (see also Fig. 6 ). This ensures that the flow of the injected inert gas is always or substantially only directed downwards, whereby an influx of zinc vapor from the zinc bath into the trunk 1 is effectively prevented.
  • the connecting pieces 7.41 of the upper main chamber section 7.4 are arranged at a distance from each other transversely to the strip running direction.
  • the connecting pieces 7.51 of the lower main chamber section 7.5 are spaced apart transversely to the strip running direction.
  • the injection and suction branches 7.10, 7.20 are provided with a plurality of openings (nozzles) 7.11, 7.21, which serve as injection openings or suction openings.
  • These openings (nozzles) 7.11, 7.21 are arranged or designed such that the protective gas flowing from the injection openings 7.11 at an angle of incidence in the range of 70 ° to 110 °, preferably 80 ° to 100 °, on the surface facing the respective injection opening Bandes 2 is addressed or hits.
  • the injection nozzles 7.11 are designed so that the protective gas flowing out of them is directed substantially at right angles to the strip surface (cf. Fig. 2 and 4 ).
  • the distance between the respective injection nozzle 7.11 and at least one associated suction opening 7.21 is selected so that at a predetermined or predetermined flow velocity of the injected protective gas occurring during movement of the belt 2 entrainment of protective gas in the direction of the zinc bath 3 is effectively interrupted or at least minimized ,
  • the entrainment of protective gas caused by the belt movement contributes to a "natural gas movement".
  • the natural gas movement is also driven by the usually existing temperature difference between the entrained by the band 2, relatively hot inert gas above the zinc bath 3 and the colder inert gas in the upper part of the trunk 1.
  • the inventive interruption or blocking this natural gas movement is at the same time the entrainment or the transport of zinc vapor from the Zinkbadober Structure 3.1 interrupted in the upper trunk area or at least minimized.
  • At least five, preferably at least seven, more preferably at least ten injection openings (nozzles) are 7.11 arranged the width of the band 2 distributed.
  • each injection opening 7.11 is at least one suction opening 7.21.
  • the injection openings 7.11 and the suction openings 7.21 are arranged in a matrix. The blowing and suction thus takes place in several Steps, preferably in at least three stages.
  • the injection openings 7.11 are arranged offset in the strip running direction and over the strip width to the suction openings 7.21 (cf. Fig. 5 ).
  • the injection openings 7.11 and the suction openings 7.21 are arranged uniformly spaced from one another.
  • a large amount of inert gas can be exchanged via the gas injection channels 7.10 without a large gas transport in the direction of strip travel.
  • the band 2 is not excited to vibrate.
  • the unwanted transport of zinc vapor from the immersion region of the strip 2 into the upper part of the snout 1 is not supported by the gas flow.
  • the trunk cross-section can be completely traversed in the transverse direction.
  • Protective gas not yet loaded with zinc dust mixes with shielding gas loaded with zinc dust and is sucked off in the vicinity.
  • the blowing suction device 6 or the blowing suction box 6.1, 6.2 can also be designed in such a way that the injection openings 7.11 on tine-like branches 7.10 of a comb-shaped blow pipe formation 7.1 and the suction openings 7.21 on tine-like branches 7.20 of a comb-shaped intake pipe formation 7.2 are formed. wherein the prong-like branches 7.10 of the comb-shaped Blasrohrgechanes 7.1 and the prong-like branches 7.20 of the comb-shaped Saugrohrgestorystoryes 7.2 interlock.
  • This configuration allows an adjustment of the distance of the injection openings 7.11 from the suction openings 7.21 by moving the comb-shaped Blasrohrgesches 7.1 relative to the comb-shaped Saugrohrgesente 7.2.
  • a zinc separation device 10 for cleaning the protective gas loaded with zinc vapor and / or zinc dust is integrated in the return line 8.
  • the zinc separator 10 is preferably provided with a cooling device which effects resublimation of zinc vapor.
  • the resulting zinc dust can be separated by means of a separator from the protective gas and passed into a collection container 10.1.
  • the purified protective gas stream is heated before blowing by means of a gas heater 11, for example to a temperature in the range of 450 to 600 ° C.
  • the trunk 1 with the Blow-suction device or the blow-suction boxes 6.1, 6.2 is heated by this gas flow so that at any point of the trunk 1, the dew point or Resublimationstemperatur of zinc vapor is exceeded.
  • the Gaseinblaskanäle 7.10 run along the tape longitudinal axis or Russellssensachse and parallel to the suction lines arranged therebetween 7.20.
  • the gas injection channels 7.10 cover a longitudinal section of the strip 2 completely or essentially completely both on the underside of the strip and on the upper side of the strip. This causes a uniform surface temperature of the blowing suction device or blowing suction boxes 6.1, 6.2, wherein the surface temperature is above the dew point or Resublimationstemperatur of zinc vapor.
  • the device 6 is designed as a push-pull system.
  • hot inert gas is injected with slight overpressure on the injection openings 7.11 in the trunk 1, to generate at the injection openings 7.11 (outlet points) cross flows.
  • the injected inert gas stream is set equal to or slightly below the extracted gas flow amount.
  • the protective gas flow injected per band side (blower suction box 6.1 or 6.2) is about 150 Nm 3 / h at about 600 ° C., while the protective gas flow drawn off per band side including zinc vapor is about 200 Nm 3 / h.
  • the Blasdorfsch (Blaschaupt Arthur) are 7.1 and the Einblaszweige (Gaseinblaskanäle) 7.10 and preferably also the main suction chamber 7.2 and the suction branches (suction lines) 7.20 thermally insulated by a heat insulating layer of the trunk structure.
  • the trunk 1 is also provided with an external heat insulation 12 to keep the inside of the trunk walls at a temperature greater than 300 ° C.
  • the lowest part of the trunk 1, i. the trunk end piece 1.1 located between the blowing suction device and the zinc bath 3 is preferably provided with a heat insulation 13.
  • the thermal insulation 13 ensures that the walls or wall sections of the trunk provided therewith during operation of the galvanizing plant are warmer than the dew point or resublimation temperature of the protective gas / zinc vapor mixture.
  • the thermal insulation 13 is formed for example of mineral wool and / or ceramic plates and surrounds the trunk end 1.1 preferably jacket-shaped.
  • a further embodiment of the invention provides that the trunk end piece 1.1 is provided with a heating device (not shown) in addition or alternatively to the heat insulation 13.
  • the oven trunk 1 designed according to the invention can be divided into three areas A, B and C with respect to the protective gas (cf. Fig. 1 ).
  • the area A comprises the end piece 1.1, which is preferably provided with a thermal insulation 13. In this area A occurs a relatively high zinc vapor loading at low gas movement.
  • the surface temperature of the snout 1 is above 440 ° C in this area.
  • the region A is followed by the region B, which is equipped with the blow-suction device according to the invention (for example in the form of blow-suction boxes 6.1, 6.2).
  • the area B serves as a separation lock or gas curtain. It interrupts the "natural gas flow", in particular the entrainment of protective gas in the direction of zinc bath 3 caused by the belt movement, by blowing purified hot inert gas while simultaneously extracting zinc vapor-laden space close to the injection points 7.11.
  • the multi-stage arrangement of the injection nozzles 7.11 and suction nozzles 7.21, the zinc vapor concentration is gradually reduced in the area B.
  • the surface temperatures of the blower suction boxes 6.1, 6.2 and the insides of the spout 1 are above the dew point or resublimation temperature of zinc vapor, i. above 400 ° C.
  • the area C is characterized by a low zinc vapor content in the protective gas.
  • the surface temperature of the inside of the trunk is more than 300 ° C. in the region C, which prevents condensation or resublimation of the zinc vapor which is still slightly present there in the protective gas.

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  • Metallurgy (AREA)
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Description

Die Erfindung betrifft ein Verfahren zur Vermeidung von durch Zinkstaub verursachten Oberflächenfehlern an verzinktem Metallband in einer kontinuierlichen Bandverzinkung, bei der in einem Durchlaufofen erhitztes Metallband unter Schutzgas durch einen Ofen-Rüssel hindurchbewegt und in ein Zinkbad eingetaucht wird, gemäß dem Oberbegriff des Anspruchs 1. Ferner betrifft die Erfindung eine Vorrichtung zur Vermeidung von durch Zinkstaub verursachten Oberflächenfehlern an verzinktem Metallband in einer kontinuierlichen Bandverzinkung, gemäß dem Oberbegriff des Anspruchs 7.The invention relates to a method for avoiding caused by zinc dust surface defects in galvanized metal strip in a continuous strip galvanizing, in which heated in a continuous furnace metal strip is moved under inert gas through a furnace proboscis and immersed in a zinc bath, according to the preamble of claim 1. Further The invention relates to a device for preventing zinc dust-induced surface defects on galvanized metal strip in a continuous strip galvanizing, according to the preamble of claim 7.

Eine Anlage zur kontinuierlichen Feuerverzinkung von Stahlband besteht unter anderem aus einem Durchlaufofen, einem Zinkbad (Schmelzbad), einer Vorrichtung zur Einstellung der Zinküberzugsdicke und einer nachfolgenden Kühleinrichtung. In dem Durchlaufofen wird das Stahlband kontinuierlich geglüht. Dabei werden durch Rekristallisation des Stahls die gewünschten mechanischen Eigenschaften des Grundwerkstoffs eingestellt. Zudem werden dabei in einer Vorwärmzone gebildete Eisenoxide reduziert. In einer auf den DurchlaufGlühofen folgenden Kühlzone wird das Band unter Schutzgas (HNX) auf eine Temperatur nahe der Schmelzbadtemperatur abgekühlt. Das Schutzgas soll verhindern, dass das geglühte Band vor dem Verzinken oxidiert, wodurch die Haftung der Zinkschicht erheblich verschlechtert würde. Das Schutzgas enthaltende Verbindungsstück zwischen Glühofen und Zinkbad wird Ofen-Rüssel genannt.A plant for the continuous galvanizing of steel strip consists inter alia of a continuous furnace, a zinc bath (molten bath), a device for adjusting the zinc coating thickness and a subsequent cooling device. In the continuous furnace, the steel strip is continuously annealed. Recrystallization of the steel sets the desired mechanical properties of the base material. In addition, iron oxides formed in a preheating zone are thereby reduced. In a cooling zone following the continuous annealing furnace, the strip is cooled under inert gas (HNX) to a temperature near the melt bath temperature. The inert gas is intended to prevent the annealed strip from oxidizing prior to galvanizing, which would significantly degrade the adhesion of the zinc layer. The protective gas containing connecting piece between annealing furnace and zinc bath is called oven proboscis.

In einem herkömmlichen Ofen-Rüssel einer kontinuierlichen Bandverzinkungsanlage kommt es üblicherweise zu Ablagerungen von Zinkstaub, der insbesondere bei in der Anlage auftretenden Erschütterungen in größeren Stücken auf das Zinkbad und/oder das Stahlband fällt und damit Oberflächenfehler (Verzinkungsfehler) verursacht. Es wurde erkannt, dass das in Richtung des Zinkbades bewegte Stahlband im Rüssel Schutzgas nach unten mitreißt, wobei das mitgerissene Schutzgas an der Zinkbadoberfläche Zinkdampf aufnimmt, welcher beim Aufsteigen des mitgerissenen Schutzgases an den kälteren Innenwänden des Rüssels kondensiert bzw. resublimiert und sich dort als Staub absetzt.In a conventional furnace proboscis of a continuous strip galvanizing plant, deposits of zinc dust usually occur which, especially in the case of vibrations occurring in the plant, fall in large pieces onto the zinc bath and / or the steel strip and thus cause surface defects (galvanizing defects). It was recognized that the moving in the direction of the zinc bath steel strip entrained in the trunk shielding gas down, the entrained inert gas on the Zinkbadoberfläche zinc vapor absorbs, which condenses or resov- enced when rising the entrained inert gas on the colder inner walls of the trunk and there as dust settles.

Aus der JP 7157853 (A ) ist eine Vorrichtung zum Entfernen von Zinkdampf in einem Rüssel einer kontinuierlichen Bandverzinkungsanlage bekannt. Um den auf der Zinkbadoberfläche entstehenden Zinkdampf zu entfernen, ist der Ofen-Rüssel mit Einblasöffnungen (Umwälzöffnungen) und vertikal darunter angeordneten Absaugöffnungen versehen. In einem ersten Ausführungsbeispiel sind in der der Oberseite des Stahlbandes zugewandten Rüsselwand eine einzelne Einblasöffnung und vertikal darunter eine einzelne Absaugöffnung angeordnet. Dementsprechend sind in der der Unterseite des Stahlbandes zugewandten Rüsselwand ebenfalls eine einzelne Einblasöffnung und vertikal darunter eine einzelne Absaugöffnung angeordnet. In einem zweiten Ausführungsbeispiel ist in einer Seitenwand des Rüssels eine einzelne Einblasöffnung angeordnet, während vertikal darunter zwei Absaugöffnungen vorgesehen sind, die als Längsschlitze in Rohren ausgebildet sind, welche die Seitenwand des Rüssels durchdringen und sich auf der Ober- und Unterseite des Stahlbandes über die gesamte Stahlbandbreite erstrecken.From the JP 7157853 (A ) discloses a device for removing zinc vapor in a trunk of a continuous strip galvanizing plant. In order to remove the zinc vapor produced on the zinc bath surface, the oven trunk is provided with injection openings (circulation openings) and suction openings arranged vertically underneath. In a first exemplary embodiment, a single injection opening is arranged in the trunk wall facing the upper side of the steel strip and a single suction opening is arranged vertically below it. Accordingly, in the underside of the steel strip facing trunk wall also a single injection opening and vertically below a single suction opening are arranged. In a second embodiment, a single injection opening is arranged in a side wall of the trunk, while vertically below two suction openings are provided, which are formed as longitudinal slots in tubes, which Penetrate side wall of the trunk and extend on the top and bottom of the steel strip over the entire steel strip width.

Mit der aus der JP 7157853 (A ) bekannten Vorrichtung muss eine relativ große Menge an Zinkdampf bzw. Zinkstaub aus dem abgesaugten Schutzgas entfernt werden. Denn aufgrund der Ausgestaltung und Anordnung der Einblasöffnungen und Absaugöffnungen ist davon auszugehen, dass diese bekannte Vorrichtung die Aufnahme von Zinkdampf durch das vom Stahlband mitgerissene Schutzgas und die Ausbreitung von Zinkdampf im Ofen-Rüssel begünstigt.With the from the JP 7157853 (A ) known device, a relatively large amount of zinc vapor or zinc dust must be removed from the extracted inert gas. Because of the design and arrangement of the injection openings and suction openings, it can be assumed that this known device favors the absorption of zinc vapor by the protective gas entrained by the steel strip and the spread of zinc vapor in the furnace trunk.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung der eingangs genannten Art anzugeben, mit dem bzw. der die Aufnahme von Zinkdampf durch das im Ofen-Rüssel enthaltene Schutzgas sowie die Ausbreitung von Zinkdampf im Ofen-Rüssel deutlich minimiert werden kann.The present invention has for its object to provide a method and an apparatus of the type mentioned, with or the recording of zinc vapor can be significantly minimized by the protective gas contained in the oven trunk and the propagation of zinc vapor in the oven trunk.

Gelöst wird diese Aufgabe durch ein Verfahren mit den Merkmalen des Anspruchs 1 bzw. durch eine Vorrichtung mit den Merkmalen des Anspruchs 7.This object is achieved by a method having the features of claim 1 or by a device having the features of claim 7.

Bei dem erfindungsgemäßen Verfahren werden im Ofen-Rüssel ebenfalls die Ober- und die Unterseite des zu verzinkenden Metallbandes (z.B. Stahlbandes) über Einblasöffnungen mit Schutzgas beaufschlagt. Mit Zinkdampf und/oder Zinkstaub beladenes Schutzgas wird über Absaugöffnungen, die beidseitig des Metallbandes benachbart den Einblasöffnungen angeordnet sind, abgesaugt. Erfindungsgemäß wird eine Vielzahl der Einblasöffnungen in der Weise ausgebildet und im Ofen-Rüssel angeordnet, dass das aus diesen Einblasöffnungen strömende Schutzgas mit einem Auftreffwinkel im Bereich von 70° bis 110°, vorzugsweise 80° bis 100°, besonders bevorzugt ca. 90° auf die der jeweiligen Einblasöffnung zugewandte Oberfläche des Metallbandes gerichtet ist. Zudem werden der Abstand zwischen der jeweiligen Einblasöffnung und wenigstens einer ihr zugeordneten Absaugöffnung so gewählt und die Strömungsgeschwindigkeit des aus der jeweiligen Einblasöffnung austretenden Schutzgases so gesteuert, dass einer bei Bewegung des Metall- bzw. Stahlbandes auftretenden Mitnahme von Schutzgas in Richtung des Zinkbades entgegenwirkt wird.In the method according to the invention, the upper and lower sides of the metal strip to be galvanized (eg steel strip) are also subjected to protective gas in the oven trunk via injection openings. Protective gas laden with zinc vapor and / or zinc dust is sucked off via suction openings, which are arranged adjacent to the injection openings on both sides of the metal strip. According to the invention, a plurality of the injection openings are formed in the manner and arranged in the oven-trunk that flows from these injection openings Protective gas with an angle of incidence in the range of 70 ° to 110 °, preferably 80 ° to 100 °, more preferably about 90 ° directed to the respective injection opening facing surface of the metal strip. In addition, the distance between the respective injection opening and at least one suction opening assigned to it are selected and the flow velocity of the protective gas emerging from the respective injection opening is controlled so that an entrainment of protective gas in the direction of the zinc bath occurring during movement of the metal or steel strip is counteracted.

Bei der erfindungsgemäßen Vorrichtung ist somit der Ofen-Rüssel mit Einblasöffnungen versehen, über die die Oberseite und die Unterseite des Metallbandes mit Schutzgas beaufschlagbar ist, wobei benachbart zu den Einblasöffnungen Absaugöffnungen zum Absaugen von mit Zinkdampf und/oder Zinkstaub beladenem Schutzgas angeordnet sind. Erfindungsgemäß ist dabei eine Vielzahl der Einblasöffnungen in der Weise ausgebildet und im Ofen-Rüssel angeordnet, dass das aus diesen Einblasöffnungen strömende Schutzgas mit einem Auftreffwinkel im Bereich von 70° bis 110°, vorzugsweise 80° bis 100°, besonders bevorzugt ca. 90° auf die der jeweiligen Einblasöffnung zugewandte Oberfläche des Metallbandes gerichtet ist, wobei der Abstand zwischen der jeweiligen Einblasöffnung und wenigstens einer ihr zugeordneten Absaugöffnung so gewählt ist, dass bei einer vorgegebenen oder vorgebbaren Strömungsgeschwindigkeit des aus der jeweiligen Einblasöffnung austretenden Schutzgases einer bei Bewegung des Metallbandes auftretenden Mitnahme von Schutzgas in Richtung des Zinkbades entgegenwirkt wird.In the apparatus according to the invention thus the oven-trunk is provided with injection openings, via which the upper side and the underside of the metal strip can be acted upon with inert gas, wherein adjacent to the injection openings suction openings for sucking loaded with zinc vapor and / or zinc dust protective gas are arranged. According to the invention, a plurality of the injection openings are formed in the manner and arranged in the oven trunk, that the protective gas flowing from these injection openings with an angle of incidence in the range of 70 ° to 110 °, preferably 80 ° to 100 °, particularly preferably about 90 ° is directed to the respective injection opening facing surface of the metal strip, wherein the distance between the respective injection opening and at least one associated suction opening is chosen so that at a predetermined or predetermined flow velocity of the exiting from the respective blowing gas shielding occurring during movement of the metal strip entrainment Protective gas is counteracted in the direction of the zinc bath.

Die Erfindung basiert auf der Idee, die Strömungsverhältnisse des Schutzgases insbesondere in Bandnähe so zu beeinflussen, dass die erwähnte Mitnahme von Schutzgas minimiert und/oder die Kondensation bzw. Resublimation von Zinkdampf an den Wänden des Rüssels verhindert wird. Im Unterschied zu der aus der JP 7157853 (A ) bekannten Vorrichtung ist es das Ziel der vorliegenden Erfindung, die Bildung von mit Zinkdampf beladenen Schutzgas bereits im Voraus zu verhindern, indem das Mitreißen des Schutzgases in Richtung Zinkbad minimiert wird. Die Erfindung schlägt hierzu eine Unterbrechung bzw. Sperrung des vom Metallband mitgerissenen Schutzgases (Schutzgasstromes) durch Anwendung eines Gasschleusen- oder Gasschleiereffektes vor.The invention is based on the idea of influencing the flow conditions of the protective gas, in particular near the belt, in such a way that the abovementioned entrainment of protective gas is minimized and / or the condensation or resublimation of zinc vapor on the walls of the trench is prevented. Unlike the one from the JP 7157853 (A ) known device, it is the object of the present invention to prevent the formation of protective gas loaded with zinc vapor in advance by minimizing the entrainment of the protective gas in the direction of zinc bath. For this purpose, the invention proposes an interruption or blocking of the protective gas entrained by the metal strip (protective gas flow) by application of a gas lock or gas curtain effect.

Eine vorteilhafte Ausgestaltung des erfindungsgemäßen Verfahrens sieht vor, dass das über die Einblasöffnungen zugeführte Schutzgas zuvor auf eine Temperatur von mindestens 500°C, vorzugsweise mindestens 550°C erwärmt wird. Durch diese Ausgestaltung kann die Resublimation von Zinkstaub im Ofen-Rüssel noch effektiver verhindert werden, da der aufgeheizte, über die Einblasöffnungen zugeführte Schutzgasstrom den an der Zinkbadoberfläche entstehenden Zinkdampf im gasförmigen Zustand hält.An advantageous embodiment of the method according to the invention provides that the protective gas supplied via the injection openings is previously heated to a temperature of at least 500 ° C., preferably at least 550 ° C. This refinement makes it possible to more effectively prevent the resublimation of zinc dust in the oven trunk, since the heated protective gas stream supplied via the injection openings keeps the zinc vapor formed in the zinc bath surface in the gaseous state.

Dementsprechend sieht eine bevorzugte Ausgestaltung der erfindungsgemäßen Vorrichtung vor, dass die Absaugöffnungen über eine mindestens einen Absaugventilator aufweisende Rückführleitung mit den Einblasöffnungen verbunden sind, wobei die Rückführleitung mit mindestens einer Heizeinrichtung zum Erwärmen des Schutzgases auf eine Temperatur von mindestens 500°C, vorzugsweise mindestens 550°C versehen ist.Accordingly, a preferred embodiment of the device according to the invention provides that the suction openings are connected to the injection openings via a return line having at least one exhaust fan, the return line having at least one heating device for heating the protective gas to a temperature of at least 500 ° C., preferably at least 550 ° C is provided.

Der großflächig und im Wesentlichen über die gesamte Rüsselbreite gleichmäßig in den Rüssel eingetragene Schutzgasstrom stellt dabei gleichzeitig ein Heizmedium für die Blas-/Saugvorrichtung dar und verhindert kalte Zonen im Rüssel, die zu einer Zinkstaub-Ausfällung führen würden. Durch die offenbarte Temperaturführung im Rüsselbereich entsteht erst gar kein sublimierter Zinkstaub im Rüssel. Vielmehr wird der im Schutzgas enthaltene Zinkdampf abgeführt, bevor er zu Staubkörnern sublimieren kann.At the same time, the protective gas flow, which is uniformly introduced into the trunk over the entire trunk width over a large area, simultaneously constitutes a heating medium for the blowing / suction device and prevents cold zones in the trunk which would lead to zinc dust precipitation. Due to the disclosed temperature control in the trunk area no sublimated zinc dust develops in the trunk. Rather, the zinc vapor contained in the protective gas is removed before it can sublime to dust grains.

Vorzugsweise wird das erfindungsgemäße Verfahren in der Weise ausgeführt, dass die Temperatur der Gaswolke in dem räumlich höher gelegenen Teil des Rüssels höher ist als die Temperatur im räumlich tiefer gelegenen Eintauchbereich des Bandes. Hierdurch werden thermische Turbulenzen im Rüssel minimiert.Preferably, the method according to the invention is carried out in such a way that the temperature of the gas cloud in the spatially higher part of the snout is higher than the temperature in the spatially deeper immersion region of the strip. This minimizes thermal turbulence in the trunk.

Eine weitere vorteilhafte Ausgestaltung des erfindungsgemäßen Verfahrens ist dadurch gekennzeichnet, dass das Einblasen von Schutzgas über die Einblasöffnungen und das Absaugen von Schutzgas über die Absaugöffnungen in mindestens drei Stufen durchgeführt wird, die in Bandlaufrichtung aufeinander folgend angeordnet sind, wobei jede der Stufen aus einer Reihe von mindestens fünf, vorzugsweise mindestens sieben Einblasöffnungen und einer Reihe von mindestens fünf, vorzugsweise mindestens sieben Absaugöffnungen gebildet ist. Auf diese Weise lässt sich eine besonders wirksame Sperrung des von dem zu verzinkenden Band mitgerissenen Schutzgases erzielen. Insbesondere lässt sich durch die relativ hohe Anzahl von Einblasöffnungen und Absaugöffnungen eine eher sanfte, turbulenzarme Schutzgas-Blasströmung erzeugen, so dass eine übermäßige, unkontrollierbare Verwirbelung des Schutzgases und erhöhte Bandschwingungen vermieden werden. Durch diese mehrstufige Anordnung der Einblasöffnungen und Absaugöffnungen lassen sich die Konzentration des Zinkdampfes im Schutzgas und damit der Partialdruck des Zinkdampfes stufenweise auf ein unkritisches Maß absenken.A further advantageous embodiment of the method according to the invention is characterized in that the blowing of inert gas through the injection openings and the suction of inert gas through the suction openings is performed in at least three stages, which are arranged consecutively in the strip running direction, each of the stages of a series of at least five, preferably at least seven injection openings and a series of at least five, preferably at least seven suction openings is formed. In this way, a particularly effective blocking of the entrained by the galvanized tape inert gas can be achieved. In particular, due to the relatively high number of injection openings and suction openings, a rather gentle, low-turbulence shielding gas blow stream can be generated, so that an excessive, uncontrollable swirling of the blower stream Protective gas and increased band vibrations are avoided. By means of this multi-stage arrangement of the injection openings and suction openings, the concentration of the zinc vapor in the protective gas and thus the partial pressure of the zinc vapor can be gradually reduced to an uncritical level.

Zu diesem Zweck sieht eine bevorzugte Ausgestaltung der erfindungsgemäßen Vorrichtung vor, dass die Einblasöffnungen und die Absaugöffnungen in mindestens drei Stufen ausgebildet sind, die in Bandlaufrichtung aufeinander folgend angeordnet sind, wobei jede der Stufen aus einer Reihe von mindestens fünf, vorzugsweise mindestens sieben Einblasöffnungen und einer Reihe von mindestens fünf, vorzugsweise mindestens sieben Absaugöffnungen gebildet ist.To this end, a preferred embodiment of the device according to the invention provides that the injection openings and the suction openings are formed in at least three stages, which are arranged consecutively in the strip running direction, each of the stages of a series of at least five, preferably at least seven injection openings and a Row of at least five, preferably at least seven suction openings is formed.

Eine weitere vorteilhafte Ausgestaltung des erfindungsgemäßen Verfahrens ist dadurch gekennzeichnet, dass der über die Einblasöffnungen zugeführte Schutzgasvolumenstrom gleich dem über die Absaugöffnungen abgesaugten Schutzgasvolumenstrom eingestellt wird oder auf einen Wert eingestellt wird, der maximal 5% unterhalb des abgesaugten Schutzgasvolumenstroms liegt. Durch die gleichen bzw. nahezu gleichen Volumenströme von zugeführtem und abgesaugtem Schutzgas und der erwähnten bevorzugten gleichmäßigen Verteilung von Einblasstellen und Absaugstellen wird die Gasturbulenz im Rüssel auf ein Minimum reduziert.A further advantageous refinement of the method according to the invention is characterized in that the protective gas volume flow supplied via the injection openings is set equal to the protective gas volume flow extracted via the suction openings or is set to a value which is at most 5% below the aspirated inert gas volume flow. By the same or nearly equal volume flows of supplied and extracted inert gas and the mentioned preferred uniform distribution of injection points and suction points, the gas turbulence in the trunk is reduced to a minimum.

Zur Erzielung einer möglichst wirksamen Sperrung oder Unterbrechung des durch das bewegte Metallband mitgerissenen Schutzgasstroms bei gleichzeitiger Minimierung der Verwirbelung des Schutzgases ist es günstig, wenn nach einer weiteren bevorzugten Ausgestaltung der erfindungsgemäßen Vorrichtung die Einblasöffnungen und die Absaugöffnungen matrixförmig angeordnet sind. Auch ist in diesem Zusammenhang günstig, wenn die Einblasöffnungen versetzt zu den Absaugöffnungen - in Bandlaufrichtung sowie über die Bandbreite betrachtet - angeordnet sind. Vorzugsweise sind die Einblasöffnungen und die Absaugöffnungen der erfindungsgemäßen Vorrichtung gleichmäßig voneinander beabstandet angeordnet.To achieve the most effective blocking or interruption of entrained by the moving metal strip protective gas stream while minimizing the turbulence of the protective gas, it is advantageous if, according to a further preferred embodiment of the invention Device, the injection openings and the suction openings are arranged in a matrix. It is also advantageous in this context if the injection openings are offset relative to the suction openings - viewed in the strip running direction and over the strip width. Preferably, the injection openings and the suction openings of the device according to the invention are arranged uniformly spaced from one another.

Der Abstand zwischen der jeweiligen Einblasöffnung (Einblasdüse) und der mindestens einen ihr zugeordneten Absaugöffnung ist vorzugsweise kleiner/gleich 25 cm, insbesondere kleiner 15 cm, und besonders bevorzugt kleiner/gleich 10 cm.The distance between the respective injection opening (injection nozzle) and the at least one associated suction opening is preferably less than / equal to 25 cm, in particular less than 15 cm, and particularly preferably less than / equal to 10 cm.

Zur Verwirklichung einer turbulenzarmen Unterbrechung des durch das bewegte Metallband mitgerissenen Schutzgasstroms bzw. zur Erzielung einer möglichst gleichmäßigen Verteilung der Einblasstellen und Absaugstellen sieht eine weitere bevorzugte Ausgestaltung der erfindungsgemäßen Vorrichtung vor, dass die Einblasöffnungen an zinkenartigen Zweigen eines kammförmigen Blasrohrgebildes und die Absaugöffnungen an zinkenartigen Zweigen eines kammförmigen Saugrohrgebildes ausgebildet sind, wobei die zinkenartigen Zweige des kammförmigen Blasrohrgebildes und die zinkenartigen Zweige des kammförmigen Saugrohrgebildes ineinander greifen.To achieve a low-turbulence interruption of entrained by the moving metal strip inert gas stream or to achieve the most even distribution of Einblasstellen and extraction points provides a further preferred embodiment of the device according to the invention, that the injection openings on tine-like branches of a comb-shaped Blasrohrgebildes and the suction openings on tine-like branches comb-shaped Saugrohrgebildes are formed, wherein the tine-like branches of the comb-shaped Blasrohrgebildes and the tine-like branches of the comb-shaped intake manifold mesh with each other.

Wird dabei der Schutzgasstrom vor dem Einblasen mittels eines Gaserhitzers aufgeheizt, vorzugsweise auf eine Temperatur im Bereich von 450 bis 600°C, so bewirkt die vorstehend genannte Ausgestaltung zugleich, dass sich an dem aus den kammförmigen Rohrgebilden zusammengesetzten Rohrleitungssystem im Betrieb eine sehr gleichmäßige Oberflächentemperaturverteilung einstellt, wobei die Oberflächentemperatur des im Rüssel angeordneten Rohrleitungssystems bei Beheizung des Schutzgasstroms auf eine Temperatur im Bereich von 450 bis 600°C oberhalb der Taupunkt- bzw. Resublimationstemperatur von Zink liegt. Insbesondere verhindert die Erwärmung des Rohrleitungssystems mit aufgeheiztem Schutzgas das Auftreten punktueller Temperaturspitzen und damit eine ungewollte Gaskonvektion bzw. Gasturbulenz.If in this case the protective gas stream is heated prior to injection by means of a gas heater, preferably to a temperature in the range from 450 to 600 ° C., then the abovementioned embodiment also causes a very uniform surface temperature distribution to be established on the pipeline system composed of the comb-shaped pipe structures during operation , where the surface temperature of the trunk When the protective gas stream is heated, the arranged piping system is at a temperature in the range from 450 to 600 ° C. above the dew point or resublimation temperature of zinc. In particular, the heating of the pipeline system with heated protective gas prevents the occurrence of punctual temperature peaks and thus undesired gas convection or gas turbulence.

In diesem Zusammenhang sieht eine weitere vorteilhafte Ausgestaltung der erfindungsgemäßen Vorrichtung vor, dass das kammförmige Blasrohrgebilde und das kammförmige Saugrohrgebilde durch eine Wärmeisolierung gegenüber dem Ofen-Rüssel thermisch isoliert sind.In this context, a further advantageous embodiment of the device according to the invention provides that the comb-shaped Blasrohrgebilde and the comb-shaped Saugrohrgebilde are thermally insulated by a thermal insulation against the oven-trunk.

Nach einer weiteren bevorzugten Ausgestaltung des erfindungsgemäßen Verfahrens wird der Ofen-Rüssel zumindest in einem Bereich, der sich vom Zinkbad bis zu den Einblasöffnungen und/oder Absaugöffnungen erstreckt, auf eine Temperatur von mindestens 400°C, vorzugsweise mindestens 450°C beheizt. Ergänzend zu einer dafür vorgesehenen Heizeinrichtung, oder alternativ dazu, kann dieser untere Bereich des Ofen-Rüssels nach einer bevorzugten Ausgestaltung der erfindungsgemäßen Vorrichtung auch mit einer Wärmeisolierung versehen sein. Hierdurch lässt sich erreichen, dass die relevanten Wände oder Wandabschnitte des Ofen-Rüssels wärmer sind als die Temperatur, bei der die Kondensation bzw. Resublimation von Zinkdampf beginnt.According to a further preferred embodiment of the method according to the invention, the oven trunk is heated to a temperature of at least 400 ° C, preferably at least 450 ° C, at least in a region extending from the zinc bath to the injection openings and / or suction openings. In addition to a heating device provided for this purpose, or alternatively, according to a preferred embodiment of the device according to the invention, this lower region of the furnace-trunk can also be provided with a thermal insulation. This makes it possible to achieve that the relevant walls or wall sections of the oven trunk are warmer than the temperature at which the condensation or resublimation of zinc vapor begins.

Weitere bevorzugte und vorteilhafte Ausgestaltungen der Erfindung sind in den beiliegenden Ansprüchen angegeben.Further preferred and advantageous embodiments of the invention are specified in the appended claims.

Nachfolgend wird die Erfindung anhand einer mehrere Ausführungsbeispiele darstellenden Zeichnung näher erläutert. Es zeigen schematisch:

Fig. 1
eine Längsschnittansicht eines Abschnitts eines erfindungsgemäß ausgeführten Ofen-Rüssels einer kontinuierlichen Bandverzinkung;
Fig. 2
eine Querschnittansicht des Ofen-Rüssels entlang der Schnittlinie II-II in Fig. 1;
Fig. 3
eine in einem Ofen-Rüssel gemäß Fig. 1 angeordnete Blas-Saugvorrichtung in Draufsicht mit zugeordneter Rückführleitung, die mit einem Absaugventilator, einer Zinkabscheidevorrichtung und einer Heizeinrichtung zum Erwärmen des von Zink gereinigten, einzublasenden Schutzgases versehen ist;
Fig. 4
eine weitere Längsschnittansicht eines Abschnitts eines erfindungsgemäß ausgeführten Ofen-Rüssels einer kontinuierlichen Bandverzinkung;
Fig. 5
eine Draufsicht auf einen Längsabschnitt des zu verzinkenden Metallbandes in einem Abschnitt des Ofen-Rüssels der Fig. 4; und
Fig. 6
den Abschnitt des Ofen-Rüssels gemäß Fig. 4 in einer perspektivischen Darstellung.
The invention will be explained in more detail with reference to a drawing illustrating several embodiments. They show schematically:
Fig. 1
a longitudinal sectional view of a portion of a running according to the invention furnace-truncheon of a continuous strip galvanizing;
Fig. 2
a cross-sectional view of the furnace-trunk along the section line II-II in Fig. 1 ;
Fig. 3
one in an oven-trunk according to Fig. 1 arranged blow-suction device in plan view with associated return line, which is provided with an exhaust fan, a Zinkabscheidevorrichtung and a heater for heating the zinc-cleaned, to be blown shielding gas;
Fig. 4
a further longitudinal sectional view of a portion of an inventively executed oven-trunk of a continuous strip galvanizing;
Fig. 5
a plan view of a longitudinal portion of the metal strip to be galvanized in a portion of the furnace-trunk of Fig. 4 ; and
Fig. 6
the section of the oven-trunk according to Fig. 4 in a perspective view.

In der Zeichnung ist ein Ofen-Rüssel 1 einer kontinuierlichen Bandverzinkung (Feuerverzinkung) skizziert. Ein zu verzinkendes Metallband 2, vorzugsweise Stahlband, wird in einem (nicht gezeigten) Durchlaufofen geglüht und unter Schutzgas (HNX) einem Zinkbad 3 zugeführt. Das Band 2 taucht schräg nach unten in das Zinkbad 3 ein und wird durch eine im Zinkbad angeordnete Rolle 4 nach oben umgelenkt. Die Badtemperatur liegt typischerweise im Bereich von ca. 440 bis 470°C. Beim Austritt aus dem Bad 3 reißt das Band 2' eine flüssige Zinkmenge mit, die erheblich über der gewünschten Überzugsdicke liegt. Das noch flüssige überschüssige Überzugsmaterial wird mittels sich über die Bandbreite erstreckende Luftstrahl-Flachdüsen 5 von Ober- und Unterseite (Vorder- und Rückseite) des beschichteten Bandes 2' abgestreift.In the drawing, a furnace-trunk 1 a continuous strip galvanizing (hot dip galvanizing) is outlined. To be galvanized metal strip 2, preferably steel strip, is in a annealed continuous furnace (not shown) and supplied to a zinc bath 3 under protective gas (HNX). The band 2 dives obliquely down into the zinc bath 3 and is deflected by a arranged in a zinc bath roller 4 upwards. The bath temperature is typically in the range of about 440 to 470 ° C. Upon exiting the bath 3, the tape 2 'entrains a quantity of liquid zinc that is significantly above the desired coating thickness. The still liquid excess coating material is stripped by means of extending over the bandwidth air jet flat nozzles 5 from the top and bottom (front and back) of the coated strip 2 '.

In dem Ofen-Rüssel 1 wird ein Teil des Schutzgases durch die Bandbewegung in Richtung Zinkbad 3 mitgerissen. Um zu verhindern, dass das mitgerissene Schutzgas an der Zinkbadoberfläche Zinkdampf aufnimmt, welcher sich an den kälteren Innenwandflächen des Rüssels 1 als Zinkstaub absetzt und Oberflächenfehler an dem verzinkten Band 2' verursachen kann, wenn er in größeren Stücken auf das Band 2 und/oder Zinkbad 3 fällt, ist der Rüssel 1 mit einer besonderen Blas-Saugvorrichtung 6 versehen.In the oven trunk 1, part of the protective gas is entrained by the belt movement in the direction of the zinc bath 3. In order to prevent the entrained inert gas from absorbing zinc vapor on the zinc bath surface, which deposits on the colder inner wall surfaces of the trench 1 as zinc dust and can cause surface defects on the galvanized belt 2 'in larger pieces on the belt 2 and / or zinc bath 3 falls, the trunk 1 is provided with a special blow-suction device 6.

Die erfindungsgemäße Blas-Saugvorrichtung 6 weist ein verzweigtes Leitungssystem 7.1, 7.2 mit einer Vielzahl von Einblas- und Absaugöffnungen 7.11, 7.21 auf, mittels derer Schutzgas im Endbereich des Rüssels 1, d.h. nahe des Zinkbades 3, so umgewälzt wird, dass der vom Band 2 mitgerissene Schutzgasstrom möglichst unterbrochen wird, jedoch ohne dass dadurch erhöhte Bandschwingungen verursacht werden. Zu diesem Zweck sind die Einblas- und Absauföffnungen 7.11, 7.21 in Bewegungsrichtung des Bandes 2 so angeordnet, dass jede Einblasöffnung 7.11 in der Nähe wenigstens einer Absaugöffnung 7.21 liegt, wodurch eingeblasenes Schutzgas in unmittelbarer Umgebung wieder abgesaugt und so eine unkontrollierbare Verwirbelung des Schutzgases verhindert wird.The blow-suction device 6 according to the invention comprises a branched line system 7.1, 7.2 with a plurality of injection and suction 7.11, 7.21, by means of which inert gas in the end of the trunk 1, ie near the zinc bath 3, is circulated so that the tape from the second entrained inert gas stream is interrupted as possible, but without causing increased band vibrations. For this purpose, the injection and suction openings 7.11, 7.21 are arranged in the direction of movement of the belt 2 so that each injection opening 7.11 is located in the vicinity of at least one suction opening 7.21, whereby injected inert gas sucked in the immediate vicinity again and thus an uncontrollable turbulence of the protective gas is prevented.

Die Blas-Saugvorrichtung 6 umfasst einen oberen Teil 6.1 und einen unteren Teil 6.2, wobei sich der obere Teil 6.1 über die gesamte Breite der Bandoberseite (Vorderseite) erstreckt, während sich der untere Teil 6.2 über die gesamte Breite der Bandunterseite (Rückseite) erstreckt. Der obere Teil 6.1 sowie der untere Teil 6.2 können jeweils kastenartig ausgebildet sein und dementsprechend als Blas-Saugkasten bzw. Blas-Saugkästen bezeichnet werden. Der jeweilige Blas-Saugkasten (6.1, 6.2) ist durch Trennwände 7.3 in eine verzweigte Blaskammer 7.1' mit parallel zueinander verlaufenden Einblaszweigen 7.10 und eine verzweigte Saugkammer 7.2' mit parallel zueinander verlaufenden Saugzweigen 7.20 unterteilt. Ein Einblaszweig 7.10 kann dabei unmittelbar neben einem Saugzweig 7.20 liegen, indem beide Zweige 7.10, 7.20 durch dieselbe Trennwand 7.3 voneinander getrennt sind. Die Unterteilung in eine verzweigte Blaskammer 7.1' und eine verzweigte Saugkammer 7.2' kann beispielsweise durch eine mäanderförmig verlaufende oder gefaltete Trennwand 7.3 bzw. durch mäanderförmig aneinandergesetzte Trennwände, die an ihren aneinander stoßenden Enden gasdicht miteinander verbunden sind, verwirklicht sein, wie in Fig. 5 skizziert ist. In die quer zur Bandlaufrichtung verlaufenden Hauptkammerabschnitte 7.4, 7.5 münden Anschlussstücke 7.41, 7.51 zum Anschluss mindestens einer Rückführleitung 8, die an einem Sauggebläse, Saugventilator 9 oder dergleichen angeschlossen ist und einen Gaskreislauf definiert bzw. ermöglicht (vgl. Fig. 3).The blowing suction device 6 comprises an upper part 6.1 and a lower part 6.2, wherein the upper part 6.1 extends over the entire width of the band top side (front side), while the lower part 6.2 extends over the entire width of the band bottom side (back side). The upper part 6.1 and the lower part 6.2 may each be box-shaped and accordingly be referred to as a blow-suction box or blow-suction boxes. The respective blower suction box (6.1, 6.2) is divided by partitions 7.3 into a branched blow chamber 7.1 'with mutually parallel injection branches 7.10 and a branched suction chamber 7.2' with mutually parallel suction branches 7.20. An injection branch 7.10 can lie directly next to a suction branch 7.20 in that both branches 7.10, 7.20 are separated from one another by the same partition 7.3. The subdivision into a branched-off blow chamber 7.1 'and a branched suction chamber 7.2' can be realized, for example, by a meandering or folded partition 7.3 or by meandering partition walls, which are gas-tightly connected to one another at their abutting ends, as in FIG Fig. 5 outlined. In the transverse to the strip running direction main chamber sections 7.4, 7.5 open fittings 7.41, 7.51 for connecting at least one return line 8, which is connected to a suction fan, suction fan 9 or the like and defines a gas cycle or allows (see. Fig. 3 ).

Das Anschlussstück 7.51 zur Absaugung des Schutzgases ist unterhalb des Anschlussstückes 7.41, über welches das Schutzgas zugeführt wird, angeordnet (siehe auch Fig. 6). Dadurch ist sichergestellt, dass die Strömung des eingeblasenen Schutzgases stets oder im Wesentlichen nur nach unten gerichtet ist, wodurch ein Aufströmen von Zinkdampf aus dem Zinkbad in den Rüssel 1 hinein wirksam verhindert wird.The connecting piece 7.51 for extracting the protective gas is below the connecting piece 7.41, via which the protective gas is supplied, arranged (see also Fig. 6 ). This ensures that the flow of the injected inert gas is always or substantially only directed downwards, whereby an influx of zinc vapor from the zinc bath into the trunk 1 is effectively prevented.

Wie in den Figuren 5 und 6 dargestellt, münden in den oberen Hauptkammerabschnitt 7.4 des jeweiligen Blas-Saugkastens 6.1 bzw. 6.2 vorzugsweise mindestens zwei Anschlussstücke 7.41 zum Einblasen von Schutzgas, während der tiefer angeordnete Hauptkammerabschnitt 7.5 des Blas-Saugkastens 6.1 bzw. 6.2 vorzugsweise mit mindestens zwei Anschlussstücke 7.51 zum Absaugen von mit Zinkdampf beladenem Schutzgas vorgesehen ist. Die Anschlussstücke 7.41 des oberen Hauptkammerabschnitts 7.4 sind dabei quer zur Bandlaufrichtung voneinander beabstandet angeordnet. Ebenso sind die Anschlussstücke 7.51 des unteren Hauptkammerabschnitts 7.5 quer zur Bandlaufrichtung voneinander beabstandet.As in the Figures 5 and 6 shown, open into the upper main chamber section 7.4 of the respective blow-suction box 6.1 or 6.2 preferably at least two fittings 7.41 for blowing inert gas, while the lower main chamber section 7.5 of the blow-suction box 6.1 or 6.2 preferably with at least two fittings 7.51 for sucking provided with zinc vapor laden inert gas. The connecting pieces 7.41 of the upper main chamber section 7.4 are arranged at a distance from each other transversely to the strip running direction. Likewise, the connecting pieces 7.51 of the lower main chamber section 7.5 are spaced apart transversely to the strip running direction.

Die Einblas- und Saugzweige 7.10, 7.20 sind mit einer Vielzahl von Öffnungen (Düsen) 7.11, 7.21 versehen, die als Einblasöffnungen bzw. Absaugöffnungen dienen. Diese Öffnungen (Düsen) 7.11, 7.21 sind so angeordnet bzw. ausgeführt, dass das aus den Einblasöffnungen 7.11 strömende Schutzgas mit einem Auftreffwinkel im Bereich von 70° bis 110°, vorzugsweise 80° bis 100°, auf die der jeweiligen Einblasöffnung zugewandte Oberfläche des Bandes 2 gerichtet ist bzw. trifft. Vorzugsweise sind die Einblasdüsen 7.11 so ausgeführt, dass das aus ihnen ausströmende Schutzgas im Wesentlichen rechtwinklig auf die Bandoberfläche gerichtet ist (vgl. Fig. 2 und 4). Der Abstand zwischen der jeweiligen Einblasdüse 7.11 und wenigstens einer ihr zugeordneten Absaugöffnung 7.21 ist dabei so gewählt, dass bei einer vorgegebenen oder vorgebbaren Strömungsgeschwindigkeit des eingeblasenen Schutzgases die bei Bewegung des Bandes 2 auftretende Mitnahme von Schutzgas in Richtung des Zinkbades 3 wirksam unterbrochen oder zumindest minimiert wird.The injection and suction branches 7.10, 7.20 are provided with a plurality of openings (nozzles) 7.11, 7.21, which serve as injection openings or suction openings. These openings (nozzles) 7.11, 7.21 are arranged or designed such that the protective gas flowing from the injection openings 7.11 at an angle of incidence in the range of 70 ° to 110 °, preferably 80 ° to 100 °, on the surface facing the respective injection opening Bandes 2 is addressed or hits. Preferably, the injection nozzles 7.11 are designed so that the protective gas flowing out of them is directed substantially at right angles to the strip surface (cf. Fig. 2 and 4 ). The distance between the respective injection nozzle 7.11 and at least one associated suction opening 7.21 is selected so that at a predetermined or predetermined flow velocity of the injected protective gas occurring during movement of the belt 2 entrainment of protective gas in the direction of the zinc bath 3 is effectively interrupted or at least minimized ,

Die durch die Bandbewegung hervorgerufene Mitnahme von Schutzgas trägt zu einer "natürlichen Gasbewegung" bei. Angetrieben wird die natürliche Gasbewegung zudem durch den üblicherweise vorhandenen Temperaturunterschied zwischen dem durch das Band 2 mitgerissenen, relativ heißen Schutzgas oberhalb des Zinkbades 3 und dem kälteren Schutzgas im oberen Bereich des Rüssels 1. Durch die erfindungsgemäße Unterbrechung oder Sperrung dieser natürlichen Gasbewegung wird zugleich die Mitnahme bzw. der Transport von Zinkdampf von der Zinkbadoberfläche 3.1 in den oberen Rüsselbereich unterbrochen oder zumindest minimiert.The entrainment of protective gas caused by the belt movement contributes to a "natural gas movement". The natural gas movement is also driven by the usually existing temperature difference between the entrained by the band 2, relatively hot inert gas above the zinc bath 3 and the colder inert gas in the upper part of the trunk 1. The inventive interruption or blocking this natural gas movement is at the same time the entrainment or the transport of zinc vapor from the Zinkbadoberfläche 3.1 interrupted in the upper trunk area or at least minimized.

Um eine möglichst gleichmäßige Sperrwirkung für die Gasbewegung in Bandlaufrichtung sowie für die aufwärtsgerichtete Gasbewegung entlang der Innenseite der Rüsselwände zu erzielen, ohne dass es dabei zu erhöhten Bandschwingungen kommt, sind mindestens fünf, vorzugsweise mindestens sieben, besonders bevorzugt mindestens zehn Einblasöffnungen (Düsen) 7.11 über die Breite des Bandes 2 verteilt angeordnet.In order to achieve a uniform blocking effect for the gas movement in the strip running direction and for the upward gas movement along the inside of the trunk walls, without causing increased band vibrations, at least five, preferably at least seven, more preferably at least ten injection openings (nozzles) are 7.11 arranged the width of the band 2 distributed.

In unmittelbarer Nähe zu jeder Einblasöffnung 7.11 befindet sich mindestens eine Absaugöffnung 7.21. Die Einblasöffnungen 7.11 und die Absaugöffnungen 7.21 sind matrixförmig angeordnet. Das Einblasen und Absaugen erfolgt somit in mehreren Stufen, vorzugsweise in mindestens drei Stufen. Die Einblasöffnungen 7.11 sind dabei in Bandlaufrichtung sowie über die Bandbreite betrachtet versetzt zu den Absaugöffnungen 7.21 angeordnet (vgl. Fig. 5). Vorzugsweise sind die Einblasöffnungen 7.11 und die Absaugöffnungen 7.21 gleichmäßig voneinander beabstandet angeordnet.In the immediate vicinity of each injection opening 7.11 is at least one suction opening 7.21. The injection openings 7.11 and the suction openings 7.21 are arranged in a matrix. The blowing and suction thus takes place in several Steps, preferably in at least three stages. In this case, the injection openings 7.11 are arranged offset in the strip running direction and over the strip width to the suction openings 7.21 (cf. Fig. 5 ). Preferably, the injection openings 7.11 and the suction openings 7.21 are arranged uniformly spaced from one another.

Über die Gaseinblaskanäle 7.10 kann eine große Menge Schutzgas ausgetauscht werden, ohne dass ein großer Gastransport in Bandlaufrichtung erfolgt. In vorteilhafter Weise wird hierdurch das Band 2 nicht zu Schwingungen angeregt. Gleichzeitig wird durch die Gasströmung der unerwünschte Transport von Zinkdampf aus dem Eintauchbereich des Bandes 2 in den oberen Teil des Rüssels 1 nicht unterstützt.A large amount of inert gas can be exchanged via the gas injection channels 7.10 without a large gas transport in the direction of strip travel. Advantageously, as a result, the band 2 is not excited to vibrate. At the same time, the unwanted transport of zinc vapor from the immersion region of the strip 2 into the upper part of the snout 1 is not supported by the gas flow.

Durch die abwechselnde Anordnung von Einblasdüsen 7.11 und Saugdüsen 7.21 (Fig. 3) kann der Rüsselquerschnitt vollständig in Querrichtung durchströmt werden. Noch nicht mit Zinkstaub beladenes Schutzgas mischt sich mit Zinkstaub beladenem Schutzgas und wird in räumlicher Nähe abgesaugt.By the alternating arrangement of injection nozzles 7.11 and suction nozzles 7.21 ( Fig. 3 ), the trunk cross-section can be completely traversed in the transverse direction. Protective gas not yet loaded with zinc dust mixes with shielding gas loaded with zinc dust and is sucked off in the vicinity.

Wie in Fig. 3 skizziert ist, kann die Blas-Saugvorrichtung 6 bzw. der Blas-Saugkasten 6.1, 6.2 auch dergestalt ausgeführt werden, dass die Einblasöffnungen 7.11 an zinkenartigen Zweigen 7.10 eines kammförmigen Blasrohrgebildes 7.1 und die Absaugöffnungen 7.21 an zinkenartigen Zweigen 7.20 eines kammförmigen Saugrohrgebildes 7.2 ausgebildet sind, wobei die zinkenartigen Zweige 7.10 des kammförmigen Blasrohrgebildes 7.1 und die zinkenartigen Zweige 7.20 des kammförmigen Saugrohrgebildes 7.2 ineinander greifen. Diese Ausgestaltung ermöglicht eine Justierung des Abstandes der Einblasöffnungen 7.11 von den Absaugöffnungen 7.21 durch Verschieben des kammförmigen Blasrohrgebildes 7.1 relativ zu dem kammförmigen Saugrohrgebilde 7.2.As in Fig. 3 The blowing suction device 6 or the blowing suction box 6.1, 6.2 can also be designed in such a way that the injection openings 7.11 on tine-like branches 7.10 of a comb-shaped blow pipe formation 7.1 and the suction openings 7.21 on tine-like branches 7.20 of a comb-shaped intake pipe formation 7.2 are formed. wherein the prong-like branches 7.10 of the comb-shaped Blasrohrgebildes 7.1 and the prong-like branches 7.20 of the comb-shaped Saugrohrgebildes 7.2 interlock. This configuration allows an adjustment of the distance of the injection openings 7.11 from the suction openings 7.21 by moving the comb-shaped Blasrohrgebildes 7.1 relative to the comb-shaped Saugrohrgebilde 7.2.

In der Rückführleitung 8 ist außer dem Sauggebläse oder Saugventilator 9 eine Zinkabscheidevorrichtung 10 zur Reinigung des mit Zinkdampf und/oder Zinkstaub beladenen Schutzgases integriert. Die Zinkabscheidevorrichtung 10 ist vorzugsweise mit einer Kühleinrichtung versehen, die eine Resublimation von Zinkdampf bewirkt. Der dadurch entstehende Zinkstaub kann mittels einer Trenneinrichtung vom Schutzgas abgetrennt und in einen Sammelbehälter 10.1 geleitet werden.In addition to the suction fan or suction fan 9, a zinc separation device 10 for cleaning the protective gas loaded with zinc vapor and / or zinc dust is integrated in the return line 8. The zinc separator 10 is preferably provided with a cooling device which effects resublimation of zinc vapor. The resulting zinc dust can be separated by means of a separator from the protective gas and passed into a collection container 10.1.

Das stufenweise Einblasen von gereinigtem bzw. unbeladenem Schutzgas und das in unmittelbarer Nähe zu den Einblasstellen erfolgende Absaugen von mit Zinkdampf und/oder Zinkstaub beladenem Schutzgas senkt die Konzentration des Zinkdampfes und/oder Zinkstaubes in dem im Rüssel 1 befindlichen Schutzgas und damit den Partialdruck des Zinkdampfes stufenweise auf ein unkritisches Maß ab. Die stufenweise Verminderung des Gehaltes an Zinkdampf und Zinkstaub in dem damit beladenen Schutzgas ist in Fig. 4 schematisch skizziert, wobei die schlangenförmigen Pfeile Z für Zinkdampf stehen, die geradlinigen Pfeile G die Strömungsrichtung des Schutzgases im Rüssel 1 und in der Blas-Absaugvorrichtung (Blas-Saugkasten) anzeigen und die "Punktwolken" D Zinkstaub darstellen. Es ist zu erkennen, dass der Gehalt an Zinkdampf und Zinkstaub von der Zinkbadoberfläche 3.1 in Richtung Glühofen stufenweise abnimmt.The gradual injection of cleaned or unladen inert gas and taking place in the immediate vicinity of the Einblasstellen suction with zinc vapor and / or zinc dust laden inert gas reduces the concentration of zinc and / or zinc dust in the protective gas located in the trunk 1 and thus the partial pressure of the zinc vapor gradually to an uncritical level. The gradual reduction of the content of zinc vapor and zinc dust in the inert gas loaded therewith is in Fig. 4 sketched schematically, wherein the serpentine arrows Z are zinc vapor, the rectilinear arrows G indicate the flow direction of the protective gas in the trunk 1 and in the blowing suction device (blow suction box) and represent the "point clouds" D zinc dust. It can be seen that the content of zinc vapor and zinc dust gradually decreases from the zinc bath surface 3.1 towards the annealing furnace.

Der gereinigte Schutzgasstrom wird vor dem Einblasen mittels eines Gaserhitzers 11 aufgeheizt, beispielsweise auf eine Temperatur im Bereich von 450 bis 600°C. Der Rüssel 1 mit der Blas-Saugvorrichtung bzw. den Blas-Saugkästen 6.1, 6.2 wird durch diesen Gasstrom so aufgeheizt, dass an keiner Stelle des Rüssels 1 die Taupunkt- bzw. Resublimationstemperatur von Zinkdampf unterschritten wird.The purified protective gas stream is heated before blowing by means of a gas heater 11, for example to a temperature in the range of 450 to 600 ° C. The trunk 1 with the Blow-suction device or the blow-suction boxes 6.1, 6.2 is heated by this gas flow so that at any point of the trunk 1, the dew point or Resublimationstemperatur of zinc vapor is exceeded.

Die Gaseinblaskanäle 7.10 verlaufen entlang der Bandlängsachse bzw. Rüssellängsachse und parallel zu den dazwischen angeordneten Absaugleitungen 7.20. In Kombination mit den Absaugleitungen 7.20 überdecken die Gaseinblaskanäle 7.10 einen Längsabschnitt des Bandes 2 vollständig oder im Wesentlichen vollständig sowohl auf der Bandunterseite als auch auf der Bandoberseite. Dies bewirkt eine gleichmäßige Oberflächentemperatur der Blas-Saugvorrichtung bzw. Blas-Saugkästen 6.1, 6.2, wobei die Oberflächentemperatur oberhalb der Taupunkt- bzw. Resublimationstemperatur von Zinkdampf liegt.The Gaseinblaskanäle 7.10 run along the tape longitudinal axis or Russellängsachse and parallel to the suction lines arranged therebetween 7.20. In combination with the suction lines 7.20, the gas injection channels 7.10 cover a longitudinal section of the strip 2 completely or essentially completely both on the underside of the strip and on the upper side of the strip. This causes a uniform surface temperature of the blowing suction device or blowing suction boxes 6.1, 6.2, wherein the surface temperature is above the dew point or Resublimationstemperatur of zinc vapor.

Die erfindungsgemäße Vorrichtung 6 ist als Druck-Zug-System (Push-Pull-System) ausgeführt. Dabei wird heißes Schutzgas mit leichtem Überdruck über die Einblasöffnungen 7.11 in den Rüssel 1 eingeblasen, um an den Einblasöffnungen 7.11 (Auslassstellen) Querströmungen zu erzeugen. Über eine Mess- und Regeleinrichtung wird der eingeblasene Schutzgasstrom gleich oder geringfügig unterhalb der abgesaugten Gasstrommenge eingestellt. Beispielsweise beträgt der pro Bandseite (Blas-Saugkasten 6.1 oder 6.2) eingeblasene Schutzgasstrom etwa 150 Nm3/h bei ca. 600°C, während der pro Bandseite abgesaugte Schutzgasstrom einschließlich Zinkdampf ca. 200 Nm3/h beträgt.The device 6 according to the invention is designed as a push-pull system. In this case, hot inert gas is injected with slight overpressure on the injection openings 7.11 in the trunk 1, to generate at the injection openings 7.11 (outlet points) cross flows. About a measuring and control device, the injected inert gas stream is set equal to or slightly below the extracted gas flow amount. For example, the protective gas flow injected per band side (blower suction box 6.1 or 6.2) is about 150 Nm 3 / h at about 600 ° C., while the protective gas flow drawn off per band side including zinc vapor is about 200 Nm 3 / h.

Um Wärmeverluste zu minimieren, sind die Blashauptkammer (Blashauptleitung) 7.1 und die Einblaszweige (Gaseinblaskanäle) 7.10 und vorzugsweise auch die Absaughauptkammer 7.2 und die Saugzweige (Absaugleitungen) 7.20 durch eine Wärmeisolierschicht von der Rüsselkonstruktion thermisch isoliert. Der Rüssel 1 ist zudem mit einer äußeren Wärmeisolierung 12 versehen, um die Innenseite der Rüsselwände auf eine Temperatur größer 300°C zu halten.In order to minimize heat losses, the Blashauptkammer (Blaschauptleitung) are 7.1 and the Einblaszweige (Gaseinblaskanäle) 7.10 and preferably also the main suction chamber 7.2 and the suction branches (suction lines) 7.20 thermally insulated by a heat insulating layer of the trunk structure. The trunk 1 is also provided with an external heat insulation 12 to keep the inside of the trunk walls at a temperature greater than 300 ° C.

Der unterste Teil des Rüssels 1, d.h. das zwischen der Blas-Saugvorrichtung und dem Zinkbad 3 befindlich Rüsselendstück 1.1 ist vorzugsweise mit einer Wärmeisolierung 13 versehen. Die Wärmeisolierung 13 stellt sicher, dass die damit versehenen Wände bzw. Wandabschnitte des Rüssels im Betrieb der Verzinkungsanlage wärmer sind als die Taupunkt- bzw. Resublimationstemperatur des Schutzgas-Zinkdampf-Gemisches. Die Wärmeisolierung 13 ist beispielsweise aus Mineralwolle- und/oder Keramikplatten gebildet und umgibt das Rüsselendstück 1.1 vorzugsweise mantelförmig.The lowest part of the trunk 1, i. the trunk end piece 1.1 located between the blowing suction device and the zinc bath 3 is preferably provided with a heat insulation 13. The thermal insulation 13 ensures that the walls or wall sections of the trunk provided therewith during operation of the galvanizing plant are warmer than the dew point or resublimation temperature of the protective gas / zinc vapor mixture. The thermal insulation 13 is formed for example of mineral wool and / or ceramic plates and surrounds the trunk end 1.1 preferably jacket-shaped.

Ferner sieht eine weitere Ausgestaltung der Erfindung vor, dass das Rüsselendstück 1.1 ergänzend oder alternativ zu der Wärmeisolierung 13 mit einer Heizeinrichtung (nicht gezeigt) versehen ist.Furthermore, a further embodiment of the invention provides that the trunk end piece 1.1 is provided with a heating device (not shown) in addition or alternatively to the heat insulation 13.

Der erfindungsgemäß ausgeführte Ofen-Rüssel 1 lässt sich in Bezug auf das Schutzgas in drei Bereiche A, B und C gliedern (vgl. Fig. 1).The oven trunk 1 designed according to the invention can be divided into three areas A, B and C with respect to the protective gas (cf. Fig. 1 ).

Der Bereich A umfasst das Endstück 1.1, das vorzugsweise mit einer Wärmeisolierung 13 versehen ist. In diesem Bereich A tritt eine relativ hohe Zinkdampfbeladung bei geringer Gasbewegung auf. Die Oberflächentemperatur des Rüssels 1 liegt in diesem Bereich oberhalb von 440°C.The area A comprises the end piece 1.1, which is preferably provided with a thermal insulation 13. In this area A occurs a relatively high zinc vapor loading at low gas movement. The surface temperature of the snout 1 is above 440 ° C in this area.

An den Bereich A schließt sich der Bereich B an, der mit der erfindungsgemäßen Blas-Saugvorrichtung (z.B. in Form der Blas-Saugkästen 6.1, 6.2) ausgerüstet ist. Der Bereich B dient als Trennschleuse oder Gasschleier. Er unterbricht den "natürlichen Gasstrom", insbesondere die durch die Bandbewegung verursachte Mitnahme von Schutzgas in Richtung Zinkbad 3, durch Einblasung von gereinigtem heißem Schutzgas bei gleichzeitiger Absaugung von mit Zinkdampf beladenem in räumlicher Nähe zu den Einblasstellen 7.11. Durch die mehrstufige Anordnung der Einblasdüsen 7.11 und Absaugdüsen 7.21 wird die Zinkdampfkonzentration stufenweise im Bereich B reduziert. Die Oberflächentemperaturen der Blas-Saugkästen 6.1, 6.2 und der Innenseiten des Rüssels 1 liegen oberhalb der Taupunkt- bzw. Resublimationstemperatur von Zinkdampf, d.h. oberhalb von 400°C.The region A is followed by the region B, which is equipped with the blow-suction device according to the invention (for example in the form of blow-suction boxes 6.1, 6.2). The area B serves as a separation lock or gas curtain. It interrupts the "natural gas flow", in particular the entrainment of protective gas in the direction of zinc bath 3 caused by the belt movement, by blowing purified hot inert gas while simultaneously extracting zinc vapor-laden space close to the injection points 7.11. The multi-stage arrangement of the injection nozzles 7.11 and suction nozzles 7.21, the zinc vapor concentration is gradually reduced in the area B. The surface temperatures of the blower suction boxes 6.1, 6.2 and the insides of the spout 1 are above the dew point or resublimation temperature of zinc vapor, i. above 400 ° C.

Oberhalb des Bereichs B folgt der Bereich C. Der Bereich C zeichnet sich durch einen geringen Zinkdampfgehalt im Schutzgas aus. Die Oberflächentemperatur der Rüsselinnenseite beträgt im Bereich C mehr als 300°C, wodurch eine Kondensation bzw. Resublimation des dort im Schutzgas noch geringfügig vorhandenen Zinkdampfes verhindert wird.Above the area B follows the area C. The area C is characterized by a low zinc vapor content in the protective gas. The surface temperature of the inside of the trunk is more than 300 ° C. in the region C, which prevents condensation or resublimation of the zinc vapor which is still slightly present there in the protective gas.

Die Ausführung der Erfindung ist nicht auf die vorstehend beschriebenen Ausführungsbeispiele beschränkt. Vielmehr sind zahlreiche Varianten möglich, die auch bei von den in der Zeichnung dargestellten Ausführungsbeispielen abweichender Gestaltung von der in den beiliegenden Patentansprüchen angegebenen Erfindung Gebrauch machen. So können beispielsweise die parallel zueinander verlaufenden Einblaszweige 7.10 und Saugzweige 7.20 des Blas-Saugkastens 6.1, 6.2 bzw. die "Zinken" des kammförmigen Blasrohrgebildes 7.1 sowie des kammförmigen Saugrohrgebildes 7.2 auch quer zur Bandlaufrichtung ausgerichtet werden. Welche dieser Varianten realisiert wird, hängt vom Verlauf der Hauptleitungen für die Schutzgaszufuhr und -absaugung in Bezug auf die Orientierung des Rüssels 1 bzw. den diesbezüglichen Montagemöglichkeiten ab.The embodiment of the invention is not limited to the embodiments described above. On the contrary, numerous variants are possible, which make use of the invention specified in the appended claims, even in the case of embodiments differing from those shown in the drawing. Thus, for example, the parallel Einblaszweige 7.10 and Saugzweige 7.20 of the blow-suction box 6.1, 6.2 or "Tines" of the comb-shaped Blasrohrgebildes 7.1 and the comb-shaped Saugrohrgebildes 7.2 are also aligned transversely to the direction of tape travel. Which of these variants is realized depends on the course of the main lines for the protective gas supply and extraction in relation to the orientation of the trunk 1 and the related installation options.

Claims (16)

  1. Method for avoiding surface defects, which are caused by zinc dust, on a galvanized metal strip in continuous strip galvanization, in which metal strip (2) heated in a continuous annealing furnace is moved through a snout (1) in protective furnace gas and is immersed into a zinc bath (3), in which, in the snout (1), the upper side and the lower side of the metal strip (2) are acted upon by protective furnace gas via injection openings (7.11), and in which protective furnace gas loaded with zinc vapour and/or zinc dust is extracted via extraction openings (7.21) which are arranged on both sides of the metal strip (2) adjacent to the injection openings (7.11), characterized in that a multiplicity of the injection openings (7.11) are configured and arranged in the snout (1) in such a manner that the protective furnace gas streaming out of said injection openings (7.11) is directed onto that surface of the metal strip (2) which faces the respective injection opening (7.11) with an angle of impact within the range of 70° to 110°, preferably 80° to 100°, wherein the distance between the respective injection opening (7.11) and at least one extraction opening (7.21) assigned thereto is selected in such a manner, and the flow velocity of the protective furnace gas emerging from the respective injection opening (7.11) is controlled in such a manner, that an entraining of protective furnace gas, which occurs during movement of the metal strip (2), in the direction of the zinc bath (3) is opposed.
  2. Method according to Claim 1, characterized in that the protective furnace gas supplied via the injection openings (7.11) is heated beforehand to a temperature of at least 500°C, preferably at least 550°C.
  3. Method according to Claim 1 or 2, characterized in that the injection of protective furnace gas via the injection openings (7.11) and the extraction of protective furnace gas via the extraction openings (7.21) is carried out in at least three stages which are arranged consecutively in the strip running direction, wherein each of the stages is formed from a series of at least five, preferably at least seven, injection openings (7.11) and a series of at least five, preferably at least seven, extraction openings (7.21).
  4. Method according to one of Claims 1 to 3, characterized in that the snout (1) is heated to a temperature of at least 400°C at least in a region which extends from the zinc bath (3) as far as the injection openings (7.11) and/or extraction openings (7.21).
  5. Method according to one of Claims 1 to 4, characterized in that the volumetric flow of protective furnace gas supplied via the injection openings (7.11) is adjusted to be identical to the volumetric flow of protective furnace gas extracted via the extraction openings (7.21), or is adjusted to a value which lies at maximum 5% below the extracted volumetric flow of protective furnace gas.
  6. Method according to one of Claims 1 to 5, characterized in that the extracted protective furnace gas loaded with zinc vapour and/or zinc dust is cleaned by means of a zinc separating apparatus (10).
  7. Apparatus for avoiding surface defects, which are caused by zinc dust, on galvanized metal strip in continuous strip galvanization, in which metal strip (2) which is to be galvanized and is heated in a continuous annealing furnace is moved through a snout (1) in protective furnace gas and is immersed into a zinc bath (3), wherein the furnace pipe (1) is provided with injection openings (7.11) via which the upper side and the lower side of the metal strip (2) can be acted upon by protective furnace gas, and wherein extraction openings (7.21) for extracting protective furnace gas loaded with zinc vapour and/or zinc dust are arranged adjacent to the injection openings (7.11), characterized in that a multiplicity of the injection openings (7.11) are configured and arranged in the snout (1) in such a manner that the protective furnace gas streaming out of said injection openings (7.11) is directed onto that surface of the metal strip (2) which faces the respective injection opening (7.11) with an angle of impact within the range of 70° to 110°, preferably 80° to 100°, wherein the distance between the respective injection opening (7.11) and at least one extraction opening (7.21) assigned thereto is selected in such a manner that, at a predetermined or predeterminable flow velocity of the protective furnace gas emerging from the respective injection opening (7.11), an entraining of protective furnace gas, which occurs during movement of the metal strip (2), in the direction of the zinc bath (3) is opposed.
  8. Apparatus according to Claim 7, characterized in that the extraction openings (7.21) are connected to the injection openings (7.11) via a return line (8) having at least one extraction ventilator (9), wherein the return line (8) is provided with at least one heating device (11) for heating the protective furnace gas to a temperature of at least 500°C, preferably at least 550°C.
  9. Apparatus according to Claim 8, characterized in that the return line (8) is provided with a zinc separating apparatus (10).
  10. Apparatus according to Claims 7 to 9, characterized in that the injection openings (7.11) for injecting protective furnace gas and the extraction openings (7.21) for extracting protective furnace gas are configured in at least three stages which are arranged consecutively in the strip running direction, wherein each of the stages is formed from a series of at least five, preferably at least seven, injection openings (7.11) and a series of at least five, preferably at least seven, extraction openings (7.21).
  11. Apparatus according to one of Claims 7 to 10, characterized in that the injection openings (7.11) and the extraction openings (7.21) are arranged in the form of a matrix.
  12. Apparatus according to one of Claims 7 to 11, characterized in that the injection openings (7.11) are arranged offset with respect to the extraction openings (7.21), as viewed in the strip running direction and over the strip width.
  13. Apparatus according to one of Claims 7 to 12, characterized in that the injection openings (7.11) and the extraction openings (7.21) are arranged uniformly spaced apart from one another.
  14. Apparatus according to one of Claims 7 to 13, characterized in that the injection openings (7.21) are formed on teeth-like branches (7.10) of a comb-shaped blow pipe structure (7.1) and the extraction openings (7.21) are formed on teeth-like branches (7.20) of a comb-shaped suction pipe structure (7.2), wherein the teeth-like branches (7.10) of the comb-shaped blow pipe structure (7.1) and the teeth-like branches (7.20) of the comb-shaped suction pipe structure (7.2) intermesh.
  15. Apparatus according to Claim 14, characterized in that the comb-shaped blow pipe structure (7.1) and the comb-shaped suction pipe structure (7.2) are thermally insulated in relation to the furnace pipe (1) by heat insulation.
  16. Apparatus according to one of Claims 7 to 15, characterized in that the snout (1) is provided with heat insulation (13) and/or a heating device at least in a region (1.1, A) which extends from the zinc bath (3) as far as the injection openings (7.11) and/or extraction openings (7.21).
EP13735251.4A 2012-07-06 2013-07-05 Method and device for avoiding surface defects caused by zinc dust in a continuous strip galvanising process Active EP2870268B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13735251T PL2870268T3 (en) 2012-07-06 2013-07-05 Method and device for avoiding surface defects caused by zinc dust in a continuous strip galvanising process

Applications Claiming Priority (2)

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DE102012106106.8A DE102012106106A1 (en) 2012-07-06 2012-07-06 Method and device for avoiding zinc dust-induced surface defects in continuous strip galvanizing
PCT/EP2013/064249 WO2014006183A1 (en) 2012-07-06 2013-07-05 Method and device for avoiding surface defects caused by zinc dust in a continuous strip galvanising process

Publications (3)

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EP2870268A1 EP2870268A1 (en) 2015-05-13
EP2870268B1 true EP2870268B1 (en) 2016-09-07
EP2870268B2 EP2870268B2 (en) 2022-11-30

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US (1) US9695496B2 (en)
EP (1) EP2870268B2 (en)
DE (1) DE102012106106A1 (en)
ES (1) ES2605829T5 (en)
PL (1) PL2870268T3 (en)
WO (1) WO2014006183A1 (en)

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DE202017101798U1 (en) 2017-03-28 2018-06-01 Schuh Anlagentechnik Gmbh Mixing separator for hot gases and galvanizing plant with at least one such mixing separator
DE102017106678A1 (en) 2017-03-28 2018-10-04 Schuh Anlagentechnik Gmbh Mixing separator for hot gases and galvanizing plant with at least one such mixing separator

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JP6256325B2 (en) * 2014-12-15 2018-01-10 Ｊｆｅスチール株式会社 Continuous hot dip galvanizing method and continuous hot dip galvanizing equipment
DE102015108334B3 (en) * 2015-05-27 2016-11-24 Thyssenkrupp Ag Apparatus and method for improved metal vapor extraction in a continuous hot dip process
CN105063535A (en) * 2015-08-04 2015-11-18 江苏捷帝机器人股份有限公司 Galvanizing device for joint shaft of robot
BE1023837B1 (en) * 2016-01-29 2017-08-09 Centre De Recherches Metallurgiques Asbl DEVICE FOR THE HYDRODYNAMIC STABILIZATION OF A CONTINUOUSLY CONTINUOUS METAL STRIP
WO2018228663A1 (en) 2017-06-12 2018-12-20 Thyssenkrupp Steel Europe Ag Apparatus and method for separating gas atmospheres
WO2018228661A1 (en) 2017-06-12 2018-12-20 Thyssenkrupp Steel Europe Ag Nozzle for a hot-dip coating system and method for operating same
WO2018228662A1 (en) 2017-06-12 2018-12-20 Thyssenkrupp Steel Europe Ag Nozzle for a hot-dip coating system
DE102018211182A1 (en) * 2018-07-06 2020-01-09 Thyssenkrupp Ag Device and method for hot dip coating a metal strip
CN110358999B (en) * 2019-08-15 2021-08-24 武汉钢铁有限公司 Hot galvanizing furnace nose with zinc ash blowing and diffusing treatment function
WO2024088875A1 (en) * 2022-10-25 2024-05-02 Tata Steel Ijmuiden B.V. A method for providing a hnx gas in a snout in a hot dip coating device and a snout

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DE102017106678A1 (en) 2017-03-28 2018-10-04 Schuh Anlagentechnik Gmbh Mixing separator for hot gases and galvanizing plant with at least one such mixing separator

Also Published As

Publication number Publication date
WO2014006183A1 (en) 2014-01-09
EP2870268A1 (en) 2015-05-13
ES2605829T5 (en) 2023-03-16
DE102012106106A1 (en) 2014-09-18
PL2870268T3 (en) 2017-07-31
US20150167138A1 (en) 2015-06-18
US9695496B2 (en) 2017-07-04
ES2605829T3 (en) 2017-03-16
EP2870268B2 (en) 2022-11-30

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