EP2795218A1 - Dispositif tuyère destiné un four de traitement thermique d'un produit plat en acier, et four équipé d'un tel dispositif tuyère - Google Patents

Dispositif tuyère destiné un four de traitement thermique d'un produit plat en acier, et four équipé d'un tel dispositif tuyère

Info

Publication number
EP2795218A1
EP2795218A1 EP12812574.7A EP12812574A EP2795218A1 EP 2795218 A1 EP2795218 A1 EP 2795218A1 EP 12812574 A EP12812574 A EP 12812574A EP 2795218 A1 EP2795218 A1 EP 2795218A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
nozzle device
gas
laa
lac
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
Application number
EP12812574.7A
Other languages
German (de)
English (en)
Other versions
EP2795218B1 (fr
Inventor
Martin Norden
Marc Blumenau
Joachim HÜLSTRUNG
Karsten MACHALITZA
Rudolf Schönenberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Steel Europe AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ThyssenKrupp Steel Europe AG filed Critical ThyssenKrupp Steel Europe AG
Publication of EP2795218A1 publication Critical patent/EP2795218A1/fr
Application granted granted Critical
Publication of EP2795218B1 publication Critical patent/EP2795218B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/02—Supplying steam, vapour, gases, or liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • F27D2007/063—Special atmospheres, e.g. high pressure atmospheres

Definitions

  • a nozzle device for a furnace for heat treating a flat steel product and equipped with such a nozzle device furnace
  • the invention relates to a nozzle device for a furnace for heat treating a flat steel product.
  • the nozzle device is designed in the manner of a nozzle beam and comprises a central supply pipe, to which at least one nozzle opening and a feed connection for connecting the nozzle device to a gas supply are provided, which is a nozzle device
  • the invention relates to a furnace for
  • Heat treatment of a flat steel product wherein the furnace comprises at least one furnace zone, the each to be treated steel flat product via a conveying path under a certain composite zone atmosphere
  • Nozzle device is provided, which is connected via at least one feed connection to a gas supply, which feeds a gas, which forms the zone atmosphere, into the nozzle device.
  • Alloy components such as Mn, Si, Al and Cr, to iron. To protect against corrosion, the so-alloyed
  • Hot dip coating proven in which the respective flat steel product in passing through a melt bath slides and is thereby provided with a Zn or Al-based coating.
  • DFF Direct Fired Furnace
  • the increased oxygen potential leads to oxidation of the iron at the strip surface.
  • the iron oxide layer thus formed is reduced. Since the thickness of the iron oxide layer is directly dependent on the time that the steel flat product of the oxidizing
  • Atmosphere is exposed, a targeted adjustment of the oxide layer thickness on the strip surface in practice is problematic. From the poorly exactly set layer thickness follows in the subsequent reduction of the oxide layer under a reducing atmosphere the
  • RTF Radiant Tube Furnace
  • Continuous furnace is heated.
  • surface contaminants are removed. For that has the
  • DE 695 07 977 T2 discloses a two-stage hot dip coating method of a chromium-containing steel alloy strip. According to this method, the strip is annealed in a first stage to be at the
  • the tape is heated in a non-oxidizing atmosphere to the temperature of the coating metal.
  • JP 02285057 A it is also known to galvanize a steel strip in a multi-stage process.
  • the previously cleaned band is treated in a non-oxidizing atmosphere at a temperature of about 820 ° C.
  • the tape is treated at about 400 ° C to 700 ° C in a weak oxidizing atmosphere before being reduced on its surface in a reducing atmosphere.
  • the cooled to about 420 ° C to 500 ° C strip is galvanized in the usual way.
  • Jet tube variant flows into the jet pipe a fuel gas, the one the furnace atmosphere or its dew point
  • the atmosphere must be designed as a function of the furnace load, because the temperature of the furnace chamber and the heating of the material through the fuel gas, i. a thickness-dependent process is regulated.
  • the object of the invention was to provide, by simple means, a nozzle device and an oven provided with such a nozzle device
  • Nozzle device has the features specified in claim 1.
  • the invention solves the above object, however, by the fact that such an oven has the features mentioned in claim 12.
  • a nozzle device according to the invention for a furnace for heat treating a flat steel product is equipped with a central supply pipe, at which at least one nozzle opening and a feed connection are provided for connecting the nozzle device to a gas supply, which comprises a gas flowing through the nozzle device and leaving the at least one nozzle opening Injects nozzle device.
  • a nozzle device according to the invention in this case has a first section in which it has a smaller effective Düsenö Maschinenschensguer bain than in a second section, which is seen in the flow direction of the gas flowing from the respective feed port through the nozzle means further away from the respective feed port.
  • the inventive design of a nozzle device takes into account the fact that the pressure of the gas introduced into the nozzle device with increasing
  • Nozzle opening of the nozzle device increases with increasing distance to the associated feed connection.
  • the enlargement of the Düsenöff ments takes place here directly proportional to the pressure drop in the nozzle openings of the nozzle device supplying gas-conducting pipe.
  • An always sufficient supply of the respective existing nozzle openings of a nozzle device according to the invention can, in each case sufficiently high pulse emerging from the respectively existing nozzle openings
  • Gas refers to all clean gases and all gas mixtures capable of effecting the purpose of heat treatment under the zone atmosphere. In practice, these may be gases which are inert with respect to the particular steel flat product to be treated, or they may be gases which cause a certain reaction at the surface of the flat steel product at the temperatures prevailing in the furnace zone.
  • gases typically used in practice include, with respect to certain alloying elements of the
  • Steel flat product reducing gas mixtures such as nitrogen-hydrogen mixtures, gas mixtures, which are intended to cause oxidation of the surface of the flat steel product, such as 2 -H 2 -0 2 gas mixtures, or nitrogen alone, when the flat steel product when heated to reactive gases of the Environment should be shielded.
  • a nozzle device has at least one nozzle opening, via which in each case a gas jet is blown into the zone of the furnace assigned to the nozzle device.
  • a gas jet is blown into the zone of the furnace assigned to the nozzle device.
  • the nozzle device a Has nozzle opening extending in the longitudinal direction of the
  • Nozzle device extends over at least a majority of the length of the supply pipe, this is
  • Orifice advantageously slit-shaped and also aligned transversely to the conveying path.
  • the respective nozzle opening also in this case
  • Nozzle opening cross-section has as the farther from the relevant feed port arranged portion of the nozzle means.
  • the above-explained variant of the invention includes the possibility that the effective opening cross section of the slot as a nozzle
  • Nozzle opening that is unlimited number of adjacent sections, of which each in the flow direction of the gas further away from the feed port portion has a larger opening cross section than that arranged closer to the feed port.
  • the nozzle device has in each case more than one nozzle opening, at least two being seen in the flow direction of the gas flowing through the nozzle device mutually arranged sections are present, of which in each case closer to the associated
  • the effective nozzle opening cross-section of each there existing at least one nozzle opening is smaller than the effective Düsenöff opening cross-section of the at least one nozzle opening, which is present in the portion of the nozzle device, which is located further away from the respective feed connection.
  • Optimum uniformity of the gas jets flowing out of the nozzle openings can be achieved in that the opening diameter in the flow direction of the gas continuously increases from nozzle opening to nozzle opening, so that nozzle openings arranged adjacent to one another always have different opening diameters.
  • nozzle openings are associated with the same opening cross-section nozzle device.
  • not every nozzle opening differs in terms of the size of its opening cross section of the next adjacent nozzle opening. Rather, only that nozzle opening which is associated with a boundary of the respective section has a different one
  • another embodiment of the invention that is important for practice provides that in the event that a plurality of nozzle openings are present, the nozzle openings are distributed in the longitudinal direction of the nozzle device
  • Nozzle device flowing gas seen closer to the associated feed port arranged portion of the nozzle device is smaller than that
  • Nozzle opening which is located in the farther away from the respective feed port portion of the
  • Nozzle device is located.
  • Nozzle device escaping gas flow rate can also be supported by the fact that the nozzle openings in the longitudinal direction of the nozzle device are arranged distributed side by side and seen in the flow direction of the gas flowing through the nozzle means with increasing distance from the associated feed port, the distance between adjacent nozzle openings smaller.
  • the nozzle openings in the portions of the nozzle device which are farther away from the feed connection are arranged on the middle in a narrower manner than in the portions adjacent to the feed connection.
  • Nozzle device is the same, then, in particular in the case that the nozzle openings each have an identical opening cross-sectional size, are in
  • nozzle device can be particularly easy to manufacture nozzle device according to the invention. This is especially true if the nozzle openings are formed by identical, separately prefabricated nozzle inserts.
  • the gas jets applied in the region of the one section can be aligned differently than those applied in the adjacent section
  • Gas jets With the help of a corresponding orientation of the nozzle openings can be, for example
  • Gas jets within the respective zone of the furnace can also be effected by arranging the nozzle openings in at least one section of the nozzle device in two or more rows, which are arranged in one another
  • Gas jets are oriented differently than the gas jets emerging from the nozzle openings of the other row.
  • Nozzle device is arranged in each case so that the incoming gas distributes as evenly as possible in the supply pipe of the nozzle device. According to a first
  • Embodiment is centered for this purpose, the feed connection with respect to the length of the supply pipe
  • the gas flowing into the supply pipe then automatically distributes itself approximately equally to the two outgoing regions of the supply pipe laterally, so that with little
  • Gas supply via a feed connection the is arranged at one of the ends of the supply pipe.
  • An optimally uniform supply of all nozzle openings of the nozzle device can be achieved in that at each end of the supply pipe a separate
  • Supply connection is provided. In this case, gas flows from each end of the supply pipe
  • Nozzle means so that within the supply pipe against each other directed gas streams are present, which meet approximately in the middle of the tube. In this way, even those in the middle of the supply pipe
  • respective furnace zone prevailing atmosphere can be achieved in that the nozzle openings in the
  • Inlet opening has a large cross section, which reduces flow losses as the gas flows into the nozzle.
  • Flat steel product comprises at least one furnace zone, which determines the particular flat steel product to be treated in a conveying path under a certain composite
  • Zone atmosphere passes through, wherein in the furnace zone an inventively designed and arranged transversely to the conveying path of the Stahlflach.s nozzle means is provided which is connected via at least one feed connection to a gas supply, which feeds a gas which forms the zone atmosphere in the nozzle means.
  • the oven according to the invention is an RTF-type oven that is indirectly heated.
  • a particularly exact adjustment of the furnace atmosphere and its dew point can be achieved in that the gas supply of the furnace is a mixing device for
  • Premixing and optionally humidifying the gas Premixing and optionally humidifying the gas.
  • each furnace zone in each case at least one inventively formed
  • Nozzle device is assigned.
  • the nozzle devices can, as already explained above, in such a way
  • nozzle device according to the invention is suitable in
  • Target temperature range lying target temperature is heated, and passes through a holding zone in which the
  • Holding temperature is maintained, wherein in order to maintain the heating atmosphere and the holding atmosphere via at least one nozzle device according to the invention in each case a gas mixture stream is passed into the heating zone and the holding zone.
  • the invention is based on
  • FIG. 1 shows a first nozzle device in a lateral view
  • FIG. 2 shows a second nozzle device in a lateral view
  • FIG. 3 shows a third nozzle device in a lateral view
  • FIG. 4 shows a fourth nozzle device in a lateral view
  • FIG. 4a shows the nozzle device according to FIG. 4 in a section along the section line XX drawn in FIG. 4; the nozzle device according to FIG. 4 in a section along the section line YY drawn in FIG. 4;
  • FIG. 4c shows the nozzle device according to FIG. 4 in a section along the section line Z-Z drawn in FIG. 4;
  • FIG. 5 shows a fifth nozzle device in a lateral view
  • Fig. 6 is a diagram of a continuous furnace for heat treating a steel strip.
  • the illustrated in Fig. 1, designed in the manner of a nozzle bar nozzle device 1 comprises a central
  • a feed connection 5 is arranged, via which a gas stream G is led into the supply pipe 2.
  • ⁇ Stammer lie on a coaxial with the longitudinal axis XL of the supply pipe 2 aligned line.
  • the nozzle openings 6a-6k are each positioned equidistantly spaced from each other, but each have different, in the flow direction S gradually increasing opening cross-sections Q on. So has the next to the feed terminal 5 positioned next
  • Nozzle opening 6a the smallest opening cross-section Qa, while in the flow direction S farthest from
  • Feed port 5 remote nozzle opening 6k has the largest opening cross-section Qk and each of the nozzle openings 6a-6j has a smaller opening cross section than the next adjacent in the flow direction S nozzle opening 6b - 6k. As a result, it is achieved that the sum of each effective equal to corresponding lengths LA1 - LA6 of the supply pipe
  • Length section L ⁇ l - LA5 increases to length LA2 - LA6.
  • a nozzle bar nozzle device 11 also designed in the manner of a nozzle bar nozzle device 11 comprises a central, circular in cross-section supply pipe 12, which is here, however, closed at its two end faces 13,14.
  • a central feed connection 15 Provided on the supply pipe 12 is a central feed connection 15, which is centered with respect to the length L of the supply pipe 12 and over which a gas flow G 2 is directed in a direction perpendicular to the longitudinal axis XL of the supply pipe 12
  • gas partial flows G2a, G2b one of which in a coaxial to the longitudinal axis XL aligned flow direction S2a in the direction of the one end face 13 and in an opposite, also coaxial with the longitudinal axis XL aligned flow direction S2b in Direction of the other end face 14 of the supply pipe 12 flows.
  • Nozzle openings 16, 16a '-16d', 16a "-16d” formed whose ⁇ Whysmittel are also on a coaxial with
  • the Düsenöff openings 16, 16a '-16d', 16a "-16d” are each positioned equidistantly spaced from each other, but each have different, starting from the centrally located nozzle opening 16 in the respective flow direction S2a, S2b of the
  • the orifices 16a ', 16a ", etc. which are respectively located on the outside, directly adjacent to the respective end face 13, 14 and furthest away from the feed connection 15, have correspondingly the largest opening cross-section.
  • Nozzle bar formed nozzle device 21 also includes a central, circular in cross-section
  • Supply pipe 22 flows.
  • the gas streams G3a, G3b are accordingly directed against each other and meet in the center M of the supply pipe 22nd
  • nozzle openings 26a '- 26c', 26a "- 26c” are provided, which are formed by nozzle inserts set in corresponding receptacles of the supply pipe 22.
  • the nozzle openings 26a'-26c ', 26a "-26c” each have identical opening cross-sections. However, starting from the respective one of the feeder connections
  • the lengths LAc ', LAc "adjoining each other with respect to the length L in the center of the supply pipe 22 have four nozzle openings 26c', 26c, respectively "while in the in
  • the nozzle device 31 likewise has a supply tube 32 with a circular cross-section and a single feed connection 35, which, as in the case of the nozzle device 1, is arranged on the one end face 33 of the supply tube 32.
  • the other end face 34 of the supply pipe 32 is closed.
  • the supply pipe 32 is in this case in three
  • Length sections LAx, LAy, LAz equal length divided, which are each associated with two slot-like nozzle openings 36a ', 36a ", 36b', 36b", 36c ', 36c "
  • Opening cross-sections of the nozzle openings 36a ', 36a "of the adjacent to the feed terminal 35 length section LAx are smaller than the opening cross-sections of
  • the opening cross sections of the nozzle openings 36b ', 36b "of the length section LAy are smaller than those
  • the nozzle openings 36a 1 - 36c "narrow each starting from the interior 37 of the
  • Supply pipe 32 conically in the direction of its outer surface 38, so that the respective gas stream flowing through the nozzle openings 36a '- 36c "accelerated and occurs as a concentrated gas jet with high momentum in the atmosphere present in the respective furnace zone kinetic energy with which the gas jets in the
  • the nozzle device 41 shown in Fig. 5 corresponds in its basic structure of the nozzle device 31, but has three axially parallel to each other arranged rows Rl, R2, R3 of Düsenöff openings 46a, 6b, 6c and at their ends 43,44 each have a feed connection 45a, 45b , via which the nozzle openings 46a, 46b, 46c are supplied with a gas flow G4a, G4b.
  • Supply pipe 42 of the nozzle device 41 formed nozzle openings 46a, 46b, 46c take starting from the respective feed port 45a, 45b toward the center of the supply pipe 42 gradually, so that the
  • nozzle openings 46a, 46b, 46c can each be aligned in different directions, so that the nozzles emerging from the nozzle openings 46a, 46b, 46c
  • Gas jets GS distribute in different directions.
  • a continuous furnace 100 shown schematically in FIG. 6 for the heat treatment of a steel strip B conveyed in the conveying direction F through the continuous furnace 100 typically a preheating zone 101, in which the steel strip B, for example, under normal atmosphere to a
  • Preheating is preheated, a heating zone 102, in which the steel strip B under a N 2 -H 2 -containing
  • Atmosphere is heated to a heating temperature, a holding zone 103, in which the steel strip B is kept under an N 2 - H 2 -containing atmosphere at the heating temperature or optionally further heated, a cooling zone 104, in which the steel strip B is cooled to a Schmelzbadbadiertauchtemperatur and an equalization and overaging zone 105 in which the steel strip B is maintained at the melt bath immersion temperature under an N 2 -H 2 -containing atmosphere.
  • each nozzle means 41 of the type shown in Fig. 5 are arranged.
  • the nozzle devices 41 are in this case connected to a central gas supply 110

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Nozzles (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

La présente invention concerne un dispositif tuyère destiné à un four (100) de traitement thermique d'un produit plat (B) en acier, comprenant un tuyau d'alimentation central (2, 12, 22, 32, 42) qui présente au moins un orifice de tuyère (6a-6k, 16-16d", 26a'-26c", 36a'-36c", 46a-46c) et un raccordement d'alimentation (5, 15, 25', 25", 35, 45', 45" ) permettant de raccorder le dispositif tuyère (1, 11, 21, 31, 41) à une alimentation en gaz qui assure l'alimentation du dispositif tuyère (1, 11, 21, 31, 41) en un gaz (G1, G2, G3a, G3b, G4, G4a, G4b) qui parcourt le dispositif tuyère (1, 11, 21, 31, 41) et sort dudit au moins un orifice de tuyère (6a-6k, 16-16d", 26a'-26c", 36a'-36c", 46a-46c), ainsi qu'un four pour le traitement thermique d'un produit plat en acier. Le dispositif tuyère et le four selon l'invention garantissent par des moyens simples l'obtention de résultats uniformes optimaux du traitement thermique respectif. A cet effet, le dispositif tuyère (1, 11, 21, 31, 41) présente une première section (LA1-LA6, LAa'-LAc", LAx-LAz) pourvue d'orifices de tuyère dont la section transversale (Q, Qa, Qk) active est plus petite que la section transversale des orifices de la deuxième section (LA1-LA6, LAa'-LAc", LAx-LAz) qui est située plus loin du raccordement d'alimentation (5, 15, 25', 25", 35, 45', 45") concerné dans le sens d'écoulement du gaz (G1, G2, G3a, G3b, G4, G4a, G4b) qui parcourt le dispositif tuyère (1, 11, 21, 31, 41) à partir du raccordement d'alimentation (5, 15, 25', 25", 35, 45', 45") respectif.
EP12812574.7A 2011-12-21 2012-12-17 Dispositif tuyère destiné un four de traitement thermique d'un produit plat en acier, et four équipé d'un tel dispositif tuyère Not-in-force EP2795218B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011056823A DE102011056823A1 (de) 2011-12-21 2011-12-21 Düseneinrichtung für einen Ofen zum Wärmebehandeln eines Stahlflachprodukts und mit einer solchen Düseneinrichtung ausgestatteter Ofen
PCT/EP2012/075770 WO2013092479A1 (fr) 2011-12-21 2012-12-17 Dispositif tuyère destiné un four de traitement thermique d'un produit plat en acier, et four équipé d'un tel dispositif tuyère

Publications (2)

Publication Number Publication Date
EP2795218A1 true EP2795218A1 (fr) 2014-10-29
EP2795218B1 EP2795218B1 (fr) 2016-04-27

Family

ID=47520925

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12812574.7A Not-in-force EP2795218B1 (fr) 2011-12-21 2012-12-17 Dispositif tuyère destiné un four de traitement thermique d'un produit plat en acier, et four équipé d'un tel dispositif tuyère

Country Status (9)

Country Link
US (1) US20140342297A1 (fr)
EP (1) EP2795218B1 (fr)
JP (1) JP6282981B2 (fr)
KR (1) KR20140103181A (fr)
CN (1) CN104040276B (fr)
CA (1) CA2856462C (fr)
DE (1) DE102011056823A1 (fr)
ES (1) ES2584065T3 (fr)
WO (1) WO2013092479A1 (fr)

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WO2013092479A1 (fr) 2013-06-27
KR20140103181A (ko) 2014-08-25
CN104040276A (zh) 2014-09-10
ES2584065T3 (es) 2016-09-23
DE102011056823A1 (de) 2013-06-27
CA2856462A1 (fr) 2013-06-27
JP2015506412A (ja) 2015-03-02
CN104040276B (zh) 2016-09-07
EP2795218B1 (fr) 2016-04-27
US20140342297A1 (en) 2014-11-20
CA2856462C (fr) 2020-01-14
JP6282981B2 (ja) 2018-02-21

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