EP3638823B1 - Trompe pour une installation de revêtement par immersion à chaud ainsi que son procédé de fonctionnement - Google Patents

Trompe pour une installation de revêtement par immersion à chaud ainsi que son procédé de fonctionnement Download PDF

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Publication number
EP3638823B1
EP3638823B1 EP17751018.7A EP17751018A EP3638823B1 EP 3638823 B1 EP3638823 B1 EP 3638823B1 EP 17751018 A EP17751018 A EP 17751018A EP 3638823 B1 EP3638823 B1 EP 3638823B1
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EP
European Patent Office
Prior art keywords
unit
blow
suction
trunk
snout
Prior art date
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Application number
EP17751018.7A
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German (de)
English (en)
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EP3638823A1 (fr
Inventor
Michael Peters
Sridhar Palepu
Marc Blumenau
Florian Spelz
Andreas WESTERFELD
Heinrich Meyring
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ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
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ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
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Publication of EP3638823A1 publication Critical patent/EP3638823A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • 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

Definitions

  • the present application describes a so-called "snout" construction as it is typically used in industrial practice as an essential part of a hot-dip or hot-dip coating system.
  • the flat metal product such as steel, which has previously been heat-treated in continuous flow, is transferred as a strip into a coating bath made of molten metal (e.g. Zn or Al-based alloys) via such a trunk, so that there is contact between the heat-treated surface and the ambient atmosphere is avoided.
  • molten metal e.g. Zn or Al-based alloys
  • a system for the continuous hot-dip coating of steel strip consists, among other things, of a continuous annealing furnace, a molten bath, a device for adjusting the coating thickness and a subsequent cooling device.
  • the steel strip is continuously annealed in the continuous furnace, the continuous furnace being divided into several chambers in which various treatments are carried out. These treatments include, for example, setting the desired mechanical properties of the base material through recrystallization of the steel. In addition, iron oxides formed in a preheating zone are reduced.
  • the strip is cooled under protective gas (HNX) to a temperature close to the melt bath temperature.
  • HNX protective gas
  • the protective gas is intended to prevent the annealed strip from oxidizing before the hot-dip coating, which would considerably impair the adhesion of the zinc layer, for example. Because of the different treatments, different gas atmospheres are sometimes required in the chambers.
  • the connecting piece or lock between the annealing furnace and the molten bath containing protective gas is called a trunk.
  • Coating faults represent a significant challenge for every operator of such a hot-dip coating system. It is known that metal evaporates from the liquid melt pool inside the trunk and can be deposited on the steel strip or the inner wall of the trunk, for example. This observation is reinforced when measures are used to generate a directed flow in the melt in the trunk, for example by using zinc pumps. Both can cause qualitative failures of the flat steel product to be produced, for example also due to the falling of condensed and agglomerated metal dust from the inner wall of the trunk onto the flat steel product.
  • Simple and established countermeasures are e.g. the targeted dewing of the trunk atmosphere to reduce the evaporation rate or the heating of the trunk.
  • the former has the negative side effect of increased slag formation on the melt pool surface or coating pool level, which also produces quality losses.
  • heating the trunk does not in itself prevent the presence of the metal dust, so that it can continue to be harmful to the process.
  • a device for removing zinc vapor in a trunk of a continuous galvanizing line is known.
  • the trunk is provided with injection openings (circulation openings) and suction openings arranged vertically below.
  • injection openings circulation openings
  • suction openings arranged vertically below.
  • a single injection opening and a single suction opening vertically below it are arranged in the trunk wall facing the upper side of the steel strip.
  • a single injection opening and a single suction opening vertically below it are also arranged.
  • a single injection opening is arranged in a side wall of the trunk, while two suction openings are provided vertically underneath, which are designed as longitudinal slots in tubes that penetrate the side wall of the trunk and extend over the entire top and bottom of the steel strip Extend steel belt width.
  • the disadvantage of such designs is insufficient sealing of the gas atmosphere with and without zinc dust. From industrial practice, it is also to be assessed as disadvantageous that there is no effective decoupling between the protective gas atmosphere of the trunk and the actual continuous furnace. Consequences are, for example, an increased Gas consumption of the furnace due to suction of the furnace atmosphere via the trunk or metal dust contamination of the furnace, if the suction in the trunk is too weak.
  • the invention is therefore based on the object of providing a device and method which effectively prevents the influence of neighboring gas atmospheres, in particular a separation of the trunk and furnace atmosphere to avoid unnecessary protective gas consumption or contamination of the furnace, as well as effectively quality losses due to metal dust caused by evaporation arises from the coating bath avoids. Further objects of the invention are a favorable manufacturability, a small space requirement and easy assembly or is suitable for the retrofitting of existing systems and can be realized with the least possible technical effort.
  • a trunk for a hot dip coating system for a flat product which extends from the exit of a continuous furnace into the melt below the coating bath level and isolates the flat product from the environment, with at least one suction unit and one blowing unit being provided and the at least one suction unit between the at least an injection unit and the coating bath level is arranged, characterized in that a pressure compensation unit is arranged between the injection unit and the outlet of the continuous furnace, and that a first pressure sensor at the outlet of the continuous furnace and a second pressure sensor are provided between the coating bath level and the pressure compensation unit.
  • Protective gas ideally N 2 or alternatively N 2 and H 2 for reasons of cost, is blown into the trunk through the injection unit at a temperature of ⁇ 500 ° C to ⁇ 650 ° C and sucked out again by the suction unit, causing it to form in the lower part of the trunk
  • a directed gas flow results on both sides of the steel strip to be produced.
  • This directed gas flow describes a vortex, starting from the injection unit, to the flat product, along the belt run in the direction of the coating bath level, which corresponds to the material flow direction, over the coating bath to the suction unit. This achieves a good seal against rising vapors from the melt and effectively extracts them.
  • both the trunk atmosphere and the furnace area near the transition to the trunk are pressure-monitored so that the amount of gas blown into the trunk and extracted can be controlled so that the difference between the pressure of the trunk atmosphere and the pressure of the furnace atmosphere is never ⁇ 0 mbar.
  • additional protective gas is blown into the trunk at a pressure compensation unit, the amount of protective gas to be injected here being regulated in such a way that no negative pressure arises in the trunk compared to the furnace.
  • Pressure equalization units are preferably provided on both sides of the flat product, which are designed the same or similar to the injection units.
  • Embodiments of a trunk according to the invention are characterized in that the suction unit is arranged at a distance of 50 mm to 200 mm from the coating bath level.
  • the suction unit for removing the trunk atmosphere contaminated with metal dust is, like the injection units, positioned transversely to the direction of the belt and acts at least over the maximum width of the flat product to be produced.
  • the suction unit is installed below the lower injection nozzle and above the coating bath level.
  • the distance to the coating bath is at least 50 mm, as there is a risk of premature failure if this distance is not reached, and is a maximum of 200 mm, as otherwise the effectiveness of the suction in a deficient area decreases because the desired gas vortex or the circulating flow is not possible forms sufficiently.
  • Embodiments of a trunk according to the invention are further characterized in that the injection unit is arranged at a distance of 200mm to 800mm from the coating bath level, or more precisely that the distance between suction unit and injection unit is a maximum of 750mm.
  • a necessary minimum distance between Injection unit and suction unit result only from their structural design.
  • the maximum distance is 750 mm, since if this distance is exceeded, only a lack of effectiveness is achieved because the vortex flow that forms deteriorates.
  • proboscis according to the invention are characterized in that a dew point unit is provided, via which humidified protective gas can be supplied for dew point control.
  • a dew point unit is provided, via which humidified protective gas can be supplied for dew point control.
  • the dew point can be monitored and adjusted by adding, for example, humidified protective gas.
  • the moisture reduces the evaporation rate from the coating bath.
  • the dew point unit is arranged between the coating bath level and the suction unit.
  • the added moisture supports the agglomeration of the metal dust particles, so that the suction result is improved. So an addition at this point is most effective.
  • Trunks according to the invention are characterized in further embodiments that the at least one injection unit and one suction unit on both sides of the flat product each extend over the transverse extent of the trunk on opposite walls, that the injection units are provided directly opposite one another, that the injection units each have at least two rows a plurality of slot nozzles with intervening interruptions, the slot nozzles of the rows are arranged offset to one another, and wherein the interruptions are shorter than the slot nozzles of the adjacent row so that the slot nozzles of the rows overlap in the material flow direction, and that the slot nozzles of an injection unit each have one Interruption of the opposite injection unit is opposite.
  • the injection units lie on both sides of the flat product guided through the trunk, preferably a continuous material web, such as steel strip.
  • the slot nozzles Due to the arrangement in rows and the interruptions in the rows, the slot nozzles can be used optimally, since the jet expansion of the protective gas flows emerging from neighboring slot nozzles does not interfere with one another and the arrangement forms a closed gas curtain. Due to the offset arrangement of the slot nozzles of an injection unit in relation to the slot nozzles or interruptions in the opposite injection unit, the Lock where the blown gas flows meet, a tight gas curtain. In this way, a very good separation of the gas atmospheres is also achieved outside the material web.
  • the suction units have main openings provided over the transverse extent, the main openings being aligned in the direction of material flow in order to generate a circulating flow.
  • the main openings are thus on the side facing away from the injection unit, which promotes entrainment of the injected gas in the direction of the material flow and the gas atmosphere is circulated. In this way, for example, zinc dust in a proboscis can also be sucked off and then filtered in order to obtain a largely "clean" gas atmosphere.
  • the injection units and suction units are each connected to at least one centered line for supplying and removing gas. In this way, the fluidic conditions can be kept largely the same over the width of the injection and extraction units.
  • the main openings have a greater height in the area of the centered line. Such a design keeps the flow conditions more uniform across the width, which improves the suction effect.
  • the suction units comprise additional openings which are oriented perpendicular to the direction of material flow. These additional openings improve the pressure conditions in the trunk and reduce the flow velocities at the openings of the suction unit, which has advantages in terms of noise and wear.
  • the slot nozzles are characterized in that the slot nozzles have a width b, that the distance a between the rows is in the range of b ⁇ a ⁇ 2 ⁇ b, and that the overlap u of the slot nozzles in the material flow direction is in the range of b ⁇ u ⁇ 3 ⁇ b, where additionally a ⁇ u.
  • the slot nozzles In order to achieve the best possible separation of the gas atmospheres, the slot nozzles must not be too far apart. It has been shown here that there is a minimum distance based on the width of the slot nozzles Good results are obtained between the rows with the same width and if the distance is more than twice the width, the risk of poor separation increases.
  • Preferred versions of the trunk are characterized in that the slot nozzles have a length l in the transverse direction, the length l being in the range of 20 ⁇ b ⁇ l ⁇ 50 ⁇ b, preferably in the range of 30 ⁇ b ⁇ l ⁇ 35 ⁇ b .
  • the injection units and / or suction units are divided into a plurality of sections in the transverse direction, each section comprising its own centered line for supplying or removing protective gas.
  • each section comprising its own centered line for supplying or removing protective gas.
  • Versions of the trunk are characterized in that the injection units and / or suction units have a semicircular cross section. Rounded cross-sections have geometries that are advantageous in terms of flow. Furthermore, the cross section of the trunk to be sealed is reduced by an injection or suction unit placed on the trunk wall.
  • the method according to the invention is characterized in that a suction amount greater than the amount injected by at least 50 Nm 3 / h is extracted. This ensures that a stable vortex flow is formed in the lower area of the trunk and that any metal dust is reliably extracted.
  • Method according to embodiments of the invention are characterized in that the compensation amount is regulated on the basis of the difference between a first pressure sensor at the outlet of the continuous furnace and a second pressure sensor between the coating bath level and the pressure compensation unit, and that the difference is in a range of greater than 0 mbar, preferably greater than 0.1 mbar , down to 0.7 mbar.
  • This largely prevents a negative pressure from developing in the trunk compared to the pressure prevailing in the continuous furnace, which prevents the furnace atmosphere from being drawn off.
  • the same pressure is sufficient; a pressure difference of 0.1 mbar has been shown to be practicable as a control variable for the lower threshold. 0.3 mbar or 0.5 mbar have proven to be favorable as the upper limit of the regulation.
  • the pressure difference is below 0.2 mbar. If the pressure difference is too low, the overpressure in the trunk presses the trunk atmosphere into the continuous furnace, which has a negative impact on the furnace atmosphere.
  • Embodiments of the method according to the invention are characterized in that the protective gas is blown in at a temperature of 500.degree. C. to 650.degree.
  • the flat product is brought or kept at a bath immersion temperature in order not to disturb the temperature control or heat treatment of the materials and to avoid condensation of constituents of the trunk atmosphere.
  • Methods according to the invention are further characterized in that nitrogen or a nitrogen-based mixture is used as the protective gas.
  • nitrogen offers cost advantages.
  • Embodiments of the method according to the invention are characterized in that hydrogen is added to the protective gas in a range from 0.5% by volume to 10% by volume. This measure is provided in particular if a limit value of 10 ppm for the oxygen content in the trunk is exceeded.
  • the targeted addition of hydrogen (H 2 ) (e.g. via the injection unit) can be selected if the oxygen (O 2 ) concentration in the trunk exceeds> 10 ppm. Otherwise there is a risk of deterioration in product quality due to unwetted areas or poor zinc adhesion on the steel strip to be produced.
  • H 2 feedpoint of the H 2 content is ideally ⁇ 0.5% by volume to ⁇ 10.0% by volume to ensure an effective action to avoid unnecessary but costs.
  • Method according to embodiments of the invention are characterized in that the dew point in the trunk is set to a range from -10 ° C to -40 ° C. It has proven to be advantageous for the product quality to set a dew point of ⁇ -10 ° C to ⁇ -40 ° C in the trunk, depending on the steel alloy to be produced, which can be done via a regulated supply of humidified protective gas (e.g. N 2 ) .
  • the inventive solution provides that the humidified protective gas is fed in directly above the coating bath level and below the suction device. The added moisture supports the agglomeration of the metal dust particles, so that the suction result is improved. Furthermore, the moisture reduces the evaporation rate from the coating bath.
  • FIG. 1 Further embodiments of the method according to the invention are characterized in that at least part of the suction quantity is cleaned in a cleaning unit and is fed back to the injection unit, compensation unit and / or the continuous furnace as protective gas.
  • the suctioned, contaminated with metal dust, proboscis atmosphere be freed from metal dust and fed back to the inventive inert gas injection.
  • the continuous furnace of the coating system itself is an alternative source of energy.
  • the cleaning can take place, for example, using a cold trap, a cyclone separator or a filter device, or a combination of these options.
  • a dilution may be necessary in order to meet the applicable occupational safety and explosion protection requirements.
  • trunk is heated or at least insulated in order to minimize metal dust deposition on the inner wall of the trunk corresponds to the state of the art and is taken for granted.
  • Fig. 1 shows a schematic side view of an embodiment of a trunk (9).
  • the trunk (9) extends from the exit of a continuous furnace (10) into the melt (13) of a coating bath.
  • the flat product (11) to be coated is fed from the continuous furnace (10) through the trunk (9) into the melt (13).
  • the guiding of the flat product (11) through the continuous furnace (10) and the melt (13) is not shown here.
  • the trunk (9) extends to below the coating bath level (12).
  • the trunk (9) In the lower area of the trunk (9) there is an injection unit (1) and a suction unit (3) arranged downstream in the material flow direction (M) and thus between the injection unit (1) and the coating bath level (12).
  • the injection unit (1) and the suction unit (3) are each provided on both sides of the flat product (11) in a transverse direction over the width of the trunk (9) and are arranged opposite one another.
  • a defined amount of inert gas is injected into the trunk (9) through the injection units (1) and an amount greater than the amount injected is drawn off by the extraction unit (3).
  • Due to the moving flat product (11) and the suction unit (3) a circulating flow is created in the lower one on both sides of the flat product (11) generated. This flow keeps metal vapor contained in the trunk atmosphere away from the flat product (11) and is drawn off via the suction unit (3).
  • a pressure compensation unit (7) is provided in the area of the upper end of the trunk (9) or at the outlet of the continuous furnace (10).
  • This pressure equalization unit (7) is also preferably provided on both sides of the flat product (11) and extends over the width of the trunk (9).
  • the structure is similar or identical to the injection unit (1).
  • the pressure compensation unit (7) introduces a compensation amount of protective gas into the trunk (9) in order to compensate for the difference between the injection amount and the suction amount.
  • At least one first and one second pressure sensor (14.1, 14.2) are provided in the trunk to regulate the compensation amount.
  • the first pressure sensor (14.1) is arranged in the upper area between the pressure compensation unit (7) and the outlet of the continuous furnace (10) in order to detect the pressure in this area.
  • the first pressure sensor (14.1) can also be arranged instead of the trunk (9) in the exit area of the continuous furnace (10) or it can be formed by sensors of the continuous furnace (10) that may be present.
  • the second pressure sensor (14.2) is arranged downstream in the material flow direction (M) behind the pressure compensation unit (7) in order to detect the pressure in the trunk (9).
  • the second pressure sensor (14.2) is arranged after the injection unit (1).
  • the position of the first and second pressure sensors (14.1, 14.2) is not limited to the variant shown; rather, the sensors can be arranged as desired in the specified area. It is also possible to use a plurality of first and / or second pressure sensors (14.1, 14.2) in order, for example, to have redundancy with regard to process reliability or to be able to work with an average value from several measuring points.
  • the compensation quantity that is supplied via the pressure compensation unit (7) is regulated.
  • the pressure difference should never be less than 0 mbar.
  • a controlled variable for the pressure difference of greater than 0.1 mbar has proven to be practicable.
  • a dew point unit (15) is also provided.
  • one or more dew point units (15) can be provided in order to adapt the dew point to the atmosphere in the trunk (9).
  • humidified protective gas can be introduced into the trunk.
  • the introduction can in principle take place at least at any point on the trunk (9), the dew point unit (15) preferably, as shown, being arranged in the lower area between the suction unit (3) and the coating bath level (12). This reduces the evaporation rate from the melt (13) and at the same time supports the agglomeration of the metal vapor particles in the proboscis atmosphere, as a result of which the suction of these particles is improved.
  • the protective gas supplied to the injection unit (1) and / or pressure equalization unit (7) can also be humidified.
  • Fig. 1 the lines (6) for the supply and discharge of protective gas to the individual injection units (1), suction units (3), pressure compensation units (7) and, if applicable, dew point unit (15).
  • Fig. 2 shows a schematic representation of an injection unit (1) according to the invention, seen perpendicular to the material flow direction M, more precisely perpendicular to the plane of the flat product (11) conveyed through.
  • two rows of slot nozzles (2) are shown, each of which has interruptions or spaces between the slot nozzles (2).
  • the slot nozzles (2) each have a width b and a length l.
  • the two rows of slot nozzles (2) are at a distance a from one another in the direction of material flow M.
  • the slot nozzles (2) of adjacent rows are offset from one another so that a slot nozzle (2) of the adjacent row is assigned to an interruption in one row.
  • the slot nozzles (2) are made longer than the intervening interruptions so that, viewed in the material flow direction M, there is an overlap u of the ends of the slot nozzles (2).
  • the overlap u is formed uniformly along the injection unit (1).
  • Fig. 3 a partial area is shown which shows the lower injection unit (1) and suction unit (3) as well as parts of the upper injection unit (1) and suction unit (3) in the trunk (9) of an exemplary embodiment.
  • the two opposite injection units (1) on the upper and lower wall of the trunk (9) are shown as well as the suction units (3) located behind them in the direction of material flow M, that is, downstream.
  • the slot nozzles (2) of the injection units (1) are arranged offset from one another.
  • the offset of the slot nozzles (2) in relation to the opposite injection unit (1) is also shown.
  • the outermost slot nozzle (2) of the lower injection unit (1) is in the front, i.e. upstream, row and the rear, i.e., downstream, row begins with an interruption.
  • the outermost slot nozzle (1) is arranged in the rear row of the upper injection unit (1) and the front row begins with an interruption.
  • the Fig. 3 Both the suction units (3) and the injection units (1) are divided into several areas by partition walls (8) viewed in the width direction.
  • these each have lines (6) which are shown in FIG Fig. 3 are each indicated by round connection openings for the lines (6).
  • the injection units (1) and the suction units (3) are each designed with a semicircular cross-section, which has advantages in terms of flow technology due to the avoidance of sharp edges.
  • FIG. 3 a preferred embodiment of a suction unit (3).
  • the main openings (4) are aligned in the direction of material flow M in order to generate a circulating flow behind the injection unit (1).
  • the main openings (4) in the area of the lines (6) are designed with a greater height in order to achieve relatively homogeneous flow conditions over the width.
  • the height of the main openings (4) can change continuously or, as in the example shown, abruptly.
  • Additional openings (5) are preferably provided on the top of the suction units (3). In addition to improving the suction, this also enables the area of the circulating flow to be shortened, which reduces the installation space required in the trunk (9) and promotes the circulating flow.
  • the additional openings can be designed with a uniform height across the width of the suction unit, or else, analogous to the main openings (4), with different heights.
  • the injection units (1) and suction units (3) can be designed with a radius of 40mm, for example, and the height of the main openings (4), for example, in the range of 10 to 15mm and the height of the additional openings (5) be about 8mm.
  • the lines (6) can then have a diameter of approx. 60 mm.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Claims (15)

  1. Trompe (9) destinée à un système de revêtement par immersion à chaud pour un produit plat (11), laquelle trompe s'étend de la sortie d'un four continu (10) jusque dans une matière en fusion (13) sous le niveau de bain de revêtement (12) et isole le produit plat (11) vis-à-vis de l'environnement, au moins une unité d'aspiration (3) et une unité d'injection par soufflage (1) étant prévues et l'au moins une unité d'aspiration (3) étant disposée entre l'au moins une unité d'injection par soufflage (1) et le niveau de bain de revêtement (12), caractérisée en ce qu'une unité de compensation de pression (7) est disposée entre l'unité d'injection par soufflage (1) et la sortie du four continu (10) et en ce qu'un premier capteur de pression (14.1) est prévu à la sortie du four continu (10) et un deuxième capteur de pression (14.2) est prévu entre le niveau de bain de revêtement (12) et l'unité de compensation de pression (7).
  2. Trompe selon la revendication 1, caractérisée en ce que l'unité d'aspiration (3) est disposée à une distance de 50 mm à 200 mm du niveau de bain de revêtement (12).
  3. Trompe selon la revendication 1 ou 2, caractérisée en ce que la distance entre l'unité d'aspiration (3) et l'unité d'injection par soufflage (1) est de 750 mm maximum.
  4. Trompe selon l'une des revendications 1 à 3, caractérisée en ce qu'une unité à point de rosée (15) est prévue qui permet d'amener le gaz protecteur humidifié à la régulation du point de rosée.
  5. Trompe selon la revendication 4, caractérisée en ce que l'unité à point de rosée (15) est disposée entre le niveau de bain de revêtement (12) et l'unité d'aspiration (3).
  6. Trompe selon l'une des revendications 1 à 5, caractérisée en ce que l'au moins une unité d'injection par soufflage (1) et une unité d'aspiration (3) s'étendent chacune de part et d'autre du produit plat (11) sur l'étendue transversale de la trompe (9) sur des parois opposées, en ce que les unités d'injection par soufflage (1) sont prévues directement l'une en face de l'autre, en ce que les unités d'injection par soufflage (1) comprennent chacune au moins deux rangées d'une pluralité de buses à fente (2) entre lesquelles sont ménagées des interruptions, les buses à fente (2) des rangées étant disposées en étant décalées les unes des autres, et les interruptions étant plus courtes que les buses à fente (2) de la rangée adjacente de sorte que les buses à fente (2) des rangées se chevauchent dans le sens d'écoulement de matière (M), et en ce que les buses à fente (2) d'une unité d'injection par soufflage (1) sont situées chacune en face d'une interruption de l'unité d'injection par soufflage (1) opposée.
  7. Procédé de fonctionnement d'une trompe (9) selon l'une des revendications 1 à 6, caractérisé en ce que du gaz protecteur est introduit à travers l'unité d'injection par soufflage (1) à un débit d'injection par soufflage de 100Nm3/h à 500Nm3/h, en ce qu'une quantité d'aspiration de 150Nm3/h à 700Nm3/h est enlevée par l'unité d'aspiration (3), en ce que la condition quantité d'aspiration supérieure à quantité d'injection par soufflage est satisfaite, et en ce que l'unité de compensation de pression (7) introduit une quantité de compensation pour réaliser un découplage de pression entre le four continu (10) et la trompe (9) .
  8. Procédé selon la revendication 7, caractérisé en ce qu'une quantité d'aspiration enlevée par aspiration est supérieure à la quantité d'injection par soufflage d'au moins 50 Nm3/h.
  9. Procédé selon la revendication 7 ou 8, caractérisé en ce que la quantité de compensation est régulée en fonction de la différence entre un premier capteur de pression (14.1) situé à la sortie du four continu (10) et un deuxième capteur de pression (14.2) situé entre le niveau de bain de revêtement (12) et l'unité de compensation de pression (7), et en ce que la différence est maintenue dans une plage supérieure à 0 mbar, de préférence supérieure à 0,1 mbar, jusqu'à 0,7 mbar.
  10. Procédé selon l'une des revendications 7 à 9, caractérisé en ce que le gaz protecteur est soufflé sur le produit plat (11) à raison de 4m/s à 10m/s.
  11. Procédé selon l'une des revendications 7 à 10, caractérisé en ce que le gaz protecteur est soufflé à une température de 500 °C à 650 °C.
  12. Procédé selon l'une des revendications 7 à 11, caractérisé en ce que de l'azote ou un mélange à base d'azote est utilisé comme gaz protecteur.
  13. Procédé selon l'une des revendications 7 à 12, caractérisé en ce que de l'hydrogène est ajouté au gaz protecteur dans une plage de 0,5 % en volume à 10 % en volume, notamment lorsqu'une valeur limite de la teneur en oxygène dans la trompe (9) de 10 ppm est dépassée.
  14. Procédé selon l'une des revendications 7 à 13, caractérisé en ce que le point de rosée dans la trompe (9) est réglé dans une plage de +30 °C à -40 °C.
  15. Procédé selon l'une des revendications 7 à 14, caractérisé en ce qu'au moins une partie de la quantité d'aspiration est nettoyée dans une unité de nettoyage et ramenée comme gaz protecteur à l'unité d'injection par soufflage (1), à l'unité de compensation (7) et/ou au four continu (10).
EP17751018.7A 2017-06-12 2017-06-12 Trompe pour une installation de revêtement par immersion à chaud ainsi que son procédé de fonctionnement Active EP3638823B1 (fr)

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JP2001049412A (ja) * 1999-08-18 2001-02-20 Nippon Steel Corp スナウト内浴面スカムの吸引・除去方法及び装置
JP2001335906A (ja) * 2000-05-26 2001-12-07 Nippon Steel Hardfacing Co Ltd スナウト内異物除去装置
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WO2024088875A1 (fr) * 2022-10-25 2024-05-02 Tata Steel Ijmuiden B.V. Procédé pour fournir un gaz hnx dans une trompe dans un dispositif de revêtement par dépôt en bain fondu et une trompe

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CN110741104B (zh) 2021-06-11
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CN110741104A (zh) 2020-01-31

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