EP2176437A2 - Dispositif de refroidissement apres galvanisation d'un produit en bande - Google Patents
Dispositif de refroidissement apres galvanisation d'un produit en bandeInfo
- Publication number
- EP2176437A2 EP2176437A2 EP08827741A EP08827741A EP2176437A2 EP 2176437 A2 EP2176437 A2 EP 2176437A2 EP 08827741 A EP08827741 A EP 08827741A EP 08827741 A EP08827741 A EP 08827741A EP 2176437 A2 EP2176437 A2 EP 2176437A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cooling
- strip
- bath
- cell
- outlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 166
- 239000000463 material Substances 0.000 title abstract 2
- 239000007789 gas Substances 0.000 claims abstract description 50
- 238000005246 galvanizing Methods 0.000 claims abstract description 46
- 239000002184 metal Substances 0.000 claims abstract description 40
- 229910052751 metal Inorganic materials 0.000 claims abstract description 40
- 239000000112 cooling gas Substances 0.000 claims abstract description 10
- 238000004064 recycling Methods 0.000 claims description 33
- 238000010791 quenching Methods 0.000 claims description 32
- 238000009434 installation Methods 0.000 claims description 30
- 239000011248 coating agent Substances 0.000 claims description 25
- 238000000576 coating method Methods 0.000 claims description 25
- 230000001174 ascending effect Effects 0.000 claims description 17
- 238000011144 upstream manufacturing Methods 0.000 claims description 17
- 230000000171 quenching effect Effects 0.000 claims description 14
- 238000011084 recovery Methods 0.000 claims description 12
- 239000000428 dust Substances 0.000 claims description 8
- 238000000137 annealing Methods 0.000 claims description 7
- 238000000429 assembly Methods 0.000 claims description 6
- 230000000712 assembly Effects 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000011247 coating layer Substances 0.000 claims description 4
- 229910001338 liquidmetal Inorganic materials 0.000 claims description 4
- 238000000151 deposition Methods 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 2
- 238000012795 verification Methods 0.000 claims description 2
- 230000003134 recirculating effect Effects 0.000 claims 2
- 230000001590 oxidative effect Effects 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 238000000605 extraction Methods 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 40
- 239000003570 air Substances 0.000 description 30
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 12
- 229910052725 zinc Inorganic materials 0.000 description 10
- 239000011701 zinc Substances 0.000 description 10
- 239000012080 ambient air Substances 0.000 description 8
- 238000005275 alloying Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013529 heat transfer fluid Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 210000003969 blast cell Anatomy 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- C23C2/0035—Means for continuously moving substrate through, into or out of the bath
-
- 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
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
-
- 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
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
-
- 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
Definitions
- the subject of the invention is a cooling device, after galvanizing, of a strip-like product passing through a galvanizing metal bath for the deposition of a coating layer on two opposite faces of the strip.
- a galvanizing metal bath for the deposition of a coating layer on two opposite faces of the strip.
- the sheet being made, normally, by rolling a metal strip, it can be subjected to a galvanizing treatment performed during the running of the strip in a galvanizing line.
- FIG. 1 schematically shows the usual constitution of a continuous galvanization line comprising successively, in the direction of travel of the strip, that is to say from left to right on FIG. an input section 1 with one or two tape unrollers 10,
- a shear 11 for example a guillotine
- a splicing welder 12 for connecting the tail of a first strip from one of the unrollers 10 to the head of the next strip from the other unroller 10', to ensure a continuous operation of the line
- a tape accumulator 13 which allows to reserve a certain length of tape so as to restore it to the line, when the flow is stopped upstream of the accumulator, for make the splice in the welder 12
- a section 14 for degreasing the cold-rolled strips or acid pickling of the hot-rolled strips
- an annealing furnace 2 comprising a heating section 21, a temperature holding section 22, a cooling section 23 and a section 24 for holding the strip at a controlled temperature before entering the molten zinc bath
- a galvanizing section 3 itself, comprising a zinc bath 31 in which is immersed the strip at the outlet of the temperature holding section 24, a device 32 for spinning the liquid zinc to control the thickness of the layer coated on both sides of the
- the strip M continuously travels between a liquid zinc bath 31 and a final cooling bath 35 along a path defined by a plurality of deflection rollers. and generally comprising a first inlet portion T1 of the strip M in the metal bath 31, in a downward direction, to a first deflector roll immersed in the bath 31, a second outlet portion T2 of the bath 31, in an upward direction, to a pair of baffle rollers 42, 42 'placed at a higher level above the bath 31 and a third portion T3 extending in a downward direction between an upper baffle roll 42 and a lower baffle roll 43 immersed in the final cooling bath 35, the band M then being evacuated, passing over a baffle roll 44, towards the rest of the installation, for example a skin-pass rolling mill 15.
- the strip is covered on both sides with a zinc layer driven upwardly with the strip.
- the covered strip then passes into a wiper device 32 of known type which makes it possible to control the thicknesses of these two coating layers.
- French Patent No. 2,726,288 of the same company discloses such an air knife dewatering device.
- the installation may comprise, on the upstream part T2 of the path of the strip, at the outlet of the metal bath 31, a heating furnace 33 making it possible to perform a so-called alloy heat treatment which ensures the diffusion of iron from the band, to the zinc coating, to create a real iron / zinc alloy.
- a heating furnace 33 making it possible to perform a so-called alloy heat treatment which ensures the diffusion of iron from the band, to the zinc coating, to create a real iron / zinc alloy.
- the strip must, however, be cooled before plunging into the quenching tank 35.
- This cooling is usually done by blowing air on both sides of the strip and the installation therefore comprises one or more cooling cells placed. in the path of the strip between the galvanizing tank 31 and the quenching tank 35.
- the installation usually comprises at least one cooling cell 34 placed on the downward path T3, above quenching tank 35 and consisting of a hollow box having two side portions surrounding a central scroll portion of the strip and separated therefrom by a porous wall.
- a supply duct 36 connected to blowing means (not shown), of the variable speed motor-blower type, makes it possible to introduce pressurized air into the two lateral parts of the box 34 which are separated from the central part. by porous walls 34a, 34b.
- the air thus introduced into the lateral parts of the box 34 is diffused by the porous walls on both sides of the strip and can be evacuated through the orifices provided at the two ends of the central part of the box, for the passage of the strip M
- the sheath 36 opens at the downstream end of the box 34 in order to provide a circulation of the air blown against the current of the scrolling of the strip.
- the oven 33 can be removed and replaced by a cooling box placed on the upward path T2 of the strip.
- the cooling air blown on the strip is ambient air collected outside the building and this air is subject to temperature and humidity variations that may have an influence on the quality of the deposit. . This depends, in fact, cooling conditions, particularly the kinetic energy of the air jet blown on the still liquid zinc and whose effect may vary with the air temperature.
- ambient air that is collected externally to be blown onto the belt may contain dust that can be incorporated into the coating or accumulate in the building.
- the galvanizing process can generate zinc dust which is then dispersed in the air escaping from the cooling cell through the inlet and outlet ports of the strip at both ends of the cooling box. 34.
- the object of the invention is to remedy all of these disadvantages by means of a new arrangement of the cooling means.
- the invention therefore relates, in a general manner, to a cooling device after galvanizing a strip-like product in a galvanizing metal bath for the deposition of a coating layer on two opposite faces of the strip, the device comprising a hollow box-shaped cooling cell having two lateral portions extending on either side of a central strip-running part, between two parallel porous faces, respectively, on both sides of the strip, and pressurized feed means of said side portions in a cooling gas diffused by said porous faces along both sides of the strip and discharged through the central portion of the cooling box.
- the device comprises suction means for at least the largest part of the cooling gases discharged at the outlet of the central part of the cooling box, connected to the means for supplying pressure to the lateral parts of the box, by at least one recycling circuit on which is placed a means of 008/000969
- the pressurized gas supply means comprise at least one fan having a gas inlet connected to the suction means by the recycling circuit and a pressurized gas outlet connected to the two lateral parts of the cooling box.
- the recycling circuit comprises means for filtering the sucked gases placed upstream of the fan, in the direction of circulation of the gases.
- the recycling circuit comprises a cooling chamber having an inlet connected to the suction means and an outlet connected to the pressurized supply means and in which is placed a heat exchanger for cooling the recycled gases.
- the two lateral parts of the cooling cell form two elongated hollow box-shaped arms extending respectively along the two sides of the strip, on either side of a central portion extending between two rectangular orifices respectively inlet and outlet of the strip
- the cooling gas suction means comprise at least one hollow box-shaped cell placed at least upstream, in the direction of travel, of the cooling cell and having two arms respectively extending along the two lateral parts of the cooling cell, on either side of a central portion having two rectangular openings for passage of the strip, respectively an inlet and an outlet opening opening near the inlet of the strip in the central portion of the cooling cell for the passage of cooling gases in the suction cell, against the flow of the band.
- the cooling cell extends over a certain running length of the strip between an inlet end of the strip at which the central portion of the cell is provided with at least one orifice gas suction connected to the recycling circuit, and an exit end of the strip at which placed at least one pressurized gas supply port of the two side portions of the cooling cell.
- the device comprises two gas recirculation circuits arranged on either side of the cooling cell and each comprising a pressurized gas supply means having a gas inlet connected to a suction means placed at a pressure end of the central portion of the cooling cell and a pressurized gas outlet connected to a supply port of the side portions of said cell, and a cooling means of the recycled gas.
- the cooling cell and the recycling circuit (s) each comprising suction, cooling and pressurized cooling gas supply means form a compact autonomous unit extending over a length limited scrolling band.
- the strip moving, at the exit of the galvanizing bath, according to an ascending strand then a downward strand passing over at least one deflector roll comprises at least two compact assemblies placed respectively on the ascending strand and on the strand. downstream and each comprising a cooling cell and at least one recycling circuit with means for suction, cooling and pressurized supply of cooled gas, said assemblies being offset in height so as to be staggered in order to reduce their overall size.
- the entire installation comprising means for controlling the movement of the strip between a galvanizing bath and a quenching bath and at least one cooling unit comprising a cooling cell and a recycling circuit, is disposed inside a closed building, provided with means for recovering gases and dust and means of sound insulation.
- the invention is particularly applicable to a galvanic coating installation of a strip product, comprising means for controlling the running of the strip between a liquid metal bath and a quenching bath, along a continuous line.
- scrolling member defined by a plurality of baffle rollers and having at least one ascending strand output of the metal bath and a descending strand.
- such an installation can be equipped with several autonomous cooling units, placed respectively on the upstream strand and on the descending strand and each comprising a cooling cell and at least one recycling circuit with suction means. , cooling and pressurized supply of cooled gas.
- these self-cooling units with gas recirculation are offset in height relative to each other so as to be placed in position. staggered in order to reduce their overall footprint and the footprint of the installation.
- the quenching bath is placed above the metal bath, so that the entire line of travel, between the metal bath and the quench bath, remains in a footprint of the same order as that of the metal bath.
- the strip is supported by a first face on a first baffle roll immersed in the metal bath, coming from a first side thereof and is supported by the same first face on a second baffle roller placed at a higher level, so that the descending part of the strip is placed on the same first side of the metal bath relative to the upward portion of the output of the metal bath.
- the second face of the strip comes into contact with a baffle roller after sufficient cooling and its surface quality is retained.
- this arrangement makes it possible to place on a second side of the metal bath, opposite to the first input side of the strip, a quality control station of the coating, in front of which passes said second face of the strip, of first in the ascending part of the outlet of the metal bath, then in the last descending part of the output of the installation, after final cooling.
- Figure 1 is a general diagram of the assembly of a galvanizing installation of known type.
- Figure 2 is an elevational view of a first embodiment of the invention.
- Figure 3 is a horizontal sectional view along the line I, I of Figure 2.
- Figure 4 is a vertical sectional view of a second embodiment of the invention.
- Figure 5 shows schematically the adaptation of the invention to a galvanization section of conventional type.
- Figure 6 schematically shows a new arrangement of a galvanizing section.
- Figure 7 shows a staggered arrangement of the cooling cells.
- Figure 8 schematically shows another arrangement of a galvanizing installation after annealing.
- FIG. 2 diagrammatically shows, in elevation, a cooling device comprising a rectangular section box 5 having, as indicated in FIG. 3, two lateral parts 51, 51 'which extend from both sides another of a central portion 50 having, at its ends, an inlet port 52 and an outlet port 52 'for the passage of the band M which runs inside the box 5 in a substantially vertical scroll plane.
- Each lateral portion 51, 51 ' is separated from the central portion 50 by a porous face 53, 53' for diffusing, on both sides of the strip M, air introduced under pressure into the box 5 which can therefore be of the same type as the cooling cell 34 described above with reference to FIG.
- the cooling cell 34 is placed on the downstream strand T3 of the strip and the air under pressure is thus introduced through the sheath 36, preferably at its lower part, in order to circulate at against current of the running direction of the band.
- the cooling cell 5 is placed on the ascending strand of the band M, the inlet orifice 52 thereof being thus placed at the lower part of the box 5 and the orifice 52 'exit to its part higher. Consequently, the air under pressure is introduced by a sheath 54 opening to the upper part of the box 5, between the two arms 51, 51 'thereof. This air is blown by a variable speed motor-blower unit 60 having an inlet 61 and an outlet 62 on which is connected the sheath 54 for supplying the box 5.
- the cooling cell is supplied with ambient air
- the cooling cell 5 is associated with a recycling circuit 6 for supplying the fan 60 with air sucked at the outlet of the central portion 50 of the box 5.
- the cooling cell 5 is associated with a recovery cell 7 in the form of a hollow box, placed upstream of the box 5, in the running direction of the strip, that is to say below the box 5 in the case of Figure 3 where the box is placed on an ascending strand.
- the recovery cell 7 is therefore also constituted by a hollow box having two rectangular openings for the passage of the strip, respectively a lower inlet orifice 71 and an upper outlet orifice 72 which opens close to the orifice 52.
- the recovery box 7 comprises a gas outlet orifice 73 which is connected to the inlet 61 of the fan 60 via a recycling circuit 6 on which is placed a means 8 for cooling the aspirated gases.
- the cooling means 8 is a closed chamber comprising a central chamber 81 into which opens a sheath 74 for evacuation of gases, connected to the outlet orifice 73 of the recovery box 7 and an upper portion 82 in the form of converging on which is connected the inlet 61 of the fan 60.
- the enclosure 8 is closed by a bottom 85 separated from the central chamber 81 by a grid 86, and forming a filtered dust collection pot.
- the inlet 71 of the entrance of the band M in the recovery box 7 has a limited width so as to simply allow the passage of the band without risk of deterioration, taking into account the vibrations thereof. It is the same for the orifice 52 'of exit of the band, formed at the upper end of the cooling box 5.
- the upper orifice 72 of the box 7 and the lower orifice 52 of the cooling box 5 are a little more open and the two boxes 5 and 7 can, moreover, be connected by a deformable seal. In this way, at least the majority of the gases introduced under pressure by the sheath 54 to the upper part of the cooling box 5 are discharged through the lower orifice 52 and sucked by the recovery box 7 in order to be returned to the inlet 61 of the fan 60 through the recycling circuit 6, after cooling in the chamber 8.
- this circulation in a closed circuit of the cooling air makes it possible to filter it as soon as it leaves the recovery box 7 by eliminating the zinc dust that can be generated by the galvanizing process and which, usually, are dispersed in the ambient air.
- the process according to the invention therefore makes it possible, on the one hand, to improve the quality of the coating and, on the other hand, to protect the environment.
- the cooling cell 5 forms, with the recovery cell 7 and the fan 60 placed on the recycling circuit 6, a compact assembly which can be more easily isolated to prevent the diffusion of dust and the transmission of noises.
- FIG. 4 shows, in vertical section, another embodiment of such a compact cooling assembly with gas recirculation.
- This cooling device comprises, as in the case of FIGS. 2 and 3, an elongate box 5 having two lateral parts 51, 51 'extending on either side of a central part 50 and separated therefrom. , each by a porous wall 53, 53 'parallel to a vertical plane of travel of the strip which passes through the central portion 50, between a lower inlet orifice 52 and an upper outlet orifice 52'.
- the two lateral parts 51, 51 ' are not interconnected and each comprise a gas inlet port 55, 55' connected by a supply duct 54, 54 '. at the outlet 62, 62 'of a variable speed motor-fan unit 60, 60'.
- These two fans 60, 60 ' have a vertical axis and are preferably arranged symmetrically on either side of the vertical plane of travel of the strip M.
- the central portion 50 is provided with two gas suction orifices 73, each connected by a recovery sheath 74, 74 ', to a recycling and cooling circuit 6, 6 '.
- Each recycling circuit 6, 6 ' comprises a cooling chamber 81 connected by a convergent 82 to the inlet 61 of the fan 60. In the cooling chamber 81 passes a circuit 83 for circulating a coolant.
- the cooling chamber 81 is separated from the convergent 82 by a filter wall 84 and is extended downwards by a pot 85 for collecting the filtered dusts.
- the whole of The fan 60 and the cooling chamber 81 thus form a circuit 6 for recycling and cooling the air which is introduced under pressure into the lateral part 51 of the box 5 via the supply orifice 55, which diffuses on the face corresponding M band through the porous wall 53, and is recovered by the suction port 73 and returned to the cooling chamber 81 before returning to the inlet of the fan 60.
- the second lateral part 51 'of the box 5 is likewise associated with a recycling and cooling circuit 6' similar to the circuit 6.
- the cooling box 5 forms, with the recycling and cooling circuits 6, 6 ', a compact assembly which can be placed in different places in the path of the strip.
- FIG. 5 shows, for example, how several cooling devices according to FIG.
- the invention can be adapted to a galvanizing section of conventional type, as shown in Figure 1, wherein the strip plunges into the galvanizing tank 31 by passing on a submerged roll 41, spring thereof following a path ascending T2 to upper deflector rollers 42, 42 'and then a downward path T3 to a deflector roll 43 immersed in the quench tank 35.
- the galvanizing section may comprise an alloying oven 33 placed at the outlet of the galvanizing tank 31 above the wiper device 32 and extending over a certain length of the upward path T2.
- the compact arrangement of the cooling device according to the invention makes it possible to place above the alloying oven 33 a first cooling box 5a associated with one or two recycling circuits with cooling 6a. Similarly, it is possible to place on the downward path T3, one or more cooling boxes 5b, 5c each associated with a recirculation circuit with cooling 6b, 6c. In this case, the arrangement shown in Figure 4 is reversed since, in the path T3, the band flows from top to bottom. FR2008 / 000969
- the strip M plunges into the metal bath 31 along a downward path T1 between the baffle roll 40 of the annealing furnace and the immersed roll 41, and then comes out of the bath 31 along an upward path T2 and then down to the quench bath 35 in a downward path T3.
- the band M instead of being directed outwardly from the upper deflector roll 42, as in the case of Figure 5 which corresponds to the usual arrangement, the band M returns to the side through which it had entered the tray 30 containing the metal bath 31, that is to say to the left side in the figures.
- the quenching bath 35 is then placed above the galvanizing metal bath 31 and not next to it, towards the exit of the strip.
- the entire galvanizing installation can be arranged in a kind of tower whose footprint does not substantially exceed that of the galvanizing tank 30.
- This constricted arrangement is facilitated by the fact that, according to the the invention, all the usual sheaths of suction and discharge of the ambient air to the cooling cells are suppressed, each cell forming, with its circuit for recycling and cooling air, a particularly compact autonomous assembly with filtering and cooling of the supply air.
- such a tower containing the entire galvanizing section can be isolated globally with respect to the environment, both to avoid air pollution by capturing the dust generated by the galvanizing, and to reduce the noises.
- an oven 33 is placed above the wiper device 32 and can be followed by cooling cells 5 placed, not only on the upstream path T2, upstream of the upper roller 42, but also on the downward path T3, above the lower roller 43, each cell 5 8 000969
- the upper roller 42 may be placed at a height sufficient to provide the number of cooling cells 5a, 5b necessary to obtain sufficient cooling of the strip before the contact of its side A 'with the lower roll 43. In this case, this roll
- the band M can go up an upward path T31 to a second upper roller 44, then descend, in a downward path T32, to a baffle roll 45 immersed in the final cooling bath 35. At the exit of this quench bath 35, the band M follows a rising path
- a verification station 37 by example a control cabin for an operator.
- This station 37 can thus be placed between the first ascending section T2 of the outlet of the metal bath 31 and the last outlet T5 downstream section of the installation, deflector rollers 48 allowing, possibly, to provide the necessary location for the station 37
- the operator placed in the control cabin thus passes, in the ascending section T2, the outer face A 'of the strip which, because of the arrangement according to the invention, comes into contact with the roll 43 only after cooling along the ascending section T2 and the descending section T3.
- This external face A 'therefore undergoes no degradation and thus constitutes the so-called "exposed” face which will subsequently be the visible face of the sheet, for example for an automobile body.
- the operator sees passing in front of him, successively, twice the same face A '. Knowing the total length of the path and the running speed of the belt which can be measured at any moment, the operator can therefore locate on the exposed face A 'of the belt, immediately above the wiper device 32, a doubtful zone and, after having allowed the time necessary for scrolling, to identify the passage of the same zone on the descending path T5 in order to check the possible presence of a defect after the final cooling and hardening of the coating.
- the arrangement according to FIG. 6 thus makes it possible to guarantee the best possible integrity of the exposed face of the coated strip.
- each cooling assembly comprising an air blast cell 5, a suction box 7 and a recycling circuit 6 with cooling 8 makes it possible to dispose of such assemblies 5, 6, 7, 8 not only along the upward path T2 but also along the downward path T3, so as to achieve sufficient cooling of the coating until the passage of the exposed face A 'on the lower roller 43.
- these cooling cells 5a, 5b, 5c each associated with a circuit (not shown) for recycling and cooling can advantageously be staggered on the ascending strand T2 and the descending strand T3.
- the coating may have an impact on the quality of the coating, in particular, the regulation of its thickness.
- the suction box 7 must be disposed above the cooling box 5 if the band flows downwards, so that the circulation of the blown air is always go against the flow of the tape.
- the invention is not limited to the case where, to reduce the length of the annealing line, the strip follows a zig-zag path by passing over two sets of rollers spaced apart in height. Indeed, the invention can also be applied to the case of a continuous annealing furnace in which the band scrolls horizontally over a large length. In this case, shown diagrammatically in FIG.
- the quenching bath 35 which, according to the invention, is offset backwards with respect to the galvanizing bath 31, can be placed above the outlet end of the enclosure annealing 8 'whose height is, then, relatively reduced.
- the third part T3 of the path of the strip then extends horizontally by returning upstream to the quench tank 35 which is shifted back a distance sufficient to dispose along said strand T3, at least one compact assembly 5, 6, 7, 8.
- the fourth portion T4 output quench bath 35 then returns horizontally downstream passing over said cooling assembly.
- the footprint of the coating plant 3 does not substantially exceed that of the galvanizing bath 31.
- the invention has been described in the usual case of a coating by passing on a roll immersed in a bath of liquid metal but it could also be applied to other coating devices, for example of the type in which the galvanizing metal bath is maintained magnetic levitation by means of induction coils arranged along the upward path of the strip after passing on the lower roller 41 which, in this case, is not immersed.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Thermal Sciences (AREA)
- Coating With Molten Metal (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0757021A FR2919877B1 (fr) | 2007-08-10 | 2007-08-10 | Dispositif de refroidissement apres galvanisation d'un produit en bande |
| PCT/FR2008/000969 WO2009024683A2 (fr) | 2007-08-10 | 2008-07-03 | Dispositif de refroidissement apres galvanisation d'un produit en bande |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2176437A2 true EP2176437A2 (fr) | 2010-04-21 |
| EP2176437B1 EP2176437B1 (fr) | 2011-01-12 |
Family
ID=38963153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08827741A Not-in-force EP2176437B1 (fr) | 2007-08-10 | 2008-07-03 | Dispositif de refroidissement apres galvanisation d'un produit en bande |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2176437B1 (fr) |
| AT (1) | ATE495276T1 (fr) |
| DE (1) | DE602008004543D1 (fr) |
| FR (1) | FR2919877B1 (fr) |
| WO (1) | WO2009024683A2 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115074653B (zh) * | 2022-08-12 | 2022-11-11 | 如皋富美龙金属制品有限公司 | 一种热镀锌铁丝冷却钝化装置 |
| CN116926453B (zh) * | 2023-07-21 | 2025-12-26 | 北京京诚之星科技开发有限公司 | 多通道冷却装置 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5186885A (en) * | 1990-10-22 | 1993-02-16 | Perneczky George C | Apparatus for cooling a traveling strip |
| FR2796139B1 (fr) * | 1999-07-06 | 2001-11-09 | Stein Heurtey | Procede et dispositif de suppression de la vibration des bandes dans des zones de soufflage de gaz, notamment des zones de refroidissement |
| JP3814170B2 (ja) * | 2001-08-08 | 2006-08-23 | 新日本製鐵株式会社 | 溶融メッキ鋼板の冷却方法及びその装置 |
| JP3762722B2 (ja) * | 2002-07-25 | 2006-04-05 | 新日本製鐵株式会社 | 溶融めっき鋼板の冷却装置および冷却方法 |
| JP4331982B2 (ja) * | 2002-09-27 | 2009-09-16 | 新日本製鐵株式会社 | 鋼帯の冷却装置 |
-
2007
- 2007-08-10 FR FR0757021A patent/FR2919877B1/fr not_active Expired - Fee Related
-
2008
- 2008-07-03 EP EP08827741A patent/EP2176437B1/fr not_active Not-in-force
- 2008-07-03 DE DE602008004543T patent/DE602008004543D1/de active Active
- 2008-07-03 AT AT08827741T patent/ATE495276T1/de active
- 2008-07-03 WO PCT/FR2008/000969 patent/WO2009024683A2/fr not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009024683A3 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE602008004543D1 (de) | 2011-02-24 |
| ATE495276T1 (de) | 2011-01-15 |
| WO2009024683A2 (fr) | 2009-02-26 |
| EP2176437B1 (fr) | 2011-01-12 |
| FR2919877A1 (fr) | 2009-02-13 |
| FR2919877B1 (fr) | 2009-10-09 |
| WO2009024683A3 (fr) | 2009-05-07 |
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