EP0875319A1 - Zwischengefäss mit mindestens einem Plasmabrenner für die Wiederaufheizung von geschmolzenem Metallen - Google Patents

Zwischengefäss mit mindestens einem Plasmabrenner für die Wiederaufheizung von geschmolzenem Metallen Download PDF

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Publication number
EP0875319A1
EP0875319A1 EP98400563A EP98400563A EP0875319A1 EP 0875319 A1 EP0875319 A1 EP 0875319A1 EP 98400563 A EP98400563 A EP 98400563A EP 98400563 A EP98400563 A EP 98400563A EP 0875319 A1 EP0875319 A1 EP 0875319A1
Authority
EP
European Patent Office
Prior art keywords
distributor
torch
metal
refractory
cover
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
EP98400563A
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English (en)
French (fr)
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EP0875319B1 (de
Inventor
Philippe Chapellier
Robert Grangier
Michel Henryon
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0875319A1 publication Critical patent/EP0875319A1/de
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Publication of EP0875319B1 publication Critical patent/EP0875319B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
    • B22D41/01—Heating means
    • B22D41/015—Heating means with external heating, i.e. the heat source not being a part of the ladle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal

Definitions

  • the invention relates to the field of continuous casting of metals, such as steel. It relates more precisely to continuous casting machines which include a torch plasma to heat the metal during its stay in the distributor.
  • the liquid steel contained in the casting does not flow directly into the bottomless ingot molds with cooled walls where it begins to solidify. It passes first in a container called “distributor", internally coated with refractories, the there are multiple functions.
  • the bottom of the distributor is provided with one or generally several orifices called “nozzles" each overhanging an ingot mold, which allows to distribute the liquid metal in the different ingot molds while the pocket There is only one metal flow hole.
  • the dispatcher constitutes a metal reserve which allows, when a pocket is emptied, to continue the pouring of the metal during the evacuation of the empty pocket and the positioning and opening a new pocket.
  • the dispatcher constitutes a privileged site for the settling of undesirable non-metallic inclusions present in the liquid steel, and this the more so as the average residence time of the metal is higher there.
  • low overheating allows to shorten the duration of solidification of the product: we can take advantage of this to pour the produced at a higher speed, resulting in a productivity gain in the steelworks, or for build a relatively compact continuous casting machine, saving on investments to put into play.
  • a first mode of supply of thermal energy to the metal passing through the distributor consists of scrolling at least part of said metal inside a channel surrounded by an inductor with appropriate characteristics, the currents induced in the metal causing it to heat up by the Joule effect.
  • This solution is quite expensive, and the size of the inductor makes it difficult to apply to small installations size, or which were not originally designed to be equipped with it.
  • WO 95/32069 describes a distributor thus equipped.
  • gas plasmagen such as nitrogen or argon
  • the gas is thus partially ionized and is brought to very high temperature (4000 to 15000 K). It has a thermal conductivity and a power of very high radiation, which makes it suitable for achieving rapid heat transfers and intense with the material to be heated.
  • the cathode and the anode are both integrated into the torch.
  • the cathode is integrated into the torch, and the anode is consisting of the liquid metal to be heated.
  • the sole of the distributor contains a electrically conductive element which is brought into contact with liquid metal during casting and connected to the positive terminal of the torch power supply. he is also possible to provide opposite polarities from those previously specified.
  • the area of the distributor in which the torch is installed must be covered by an internally coated refractory cover.
  • This cover prevents the radiation from the arc does not blind the personnel working on the installation. Else hand, it is imperative that the torch acts on bare liquid metal, therefore not covered by the heat-insulating powder which it is usual to spread on its surface to protect it from atmospheric reoxidation and stop its radiation.
  • the cover under which you can inject a neutral gas such as argon in addition to the plasma gas (or in its place for periods when the torch is not used), allows to keep in the vicinity of the torch an almost oxygen-free atmosphere, therefore non-polluting for the metal liquid.
  • the refractories lining the distributor and its cover receive a share significant radiation from the arc emitted by the torch, and their surface is, therefore, carried at very high temperatures which can be higher than 1800 ° C when the torch is used at high power. At these temperatures, magnesia or alumina, which are the materials usually used, reaches its melting point, and the coatings deteriorate rapidly, which means that the restoration of the cover coating. In addition, the refractory which has become liquid tends to flow on the surface. of the metal bath, where it forms an insulating crust which hinders the heat transfers between the plasma and metal, and may even end up defusing the arc (in the case of a transferred plasma torch).
  • This molten refractory can also flow from the cover on the metal tube surrounding the torch and degrade it. So we are forced to find a torch operating point which achieves a compromise between heating the sufficient metal and tolerable deterioration in refractories, to the detriment of the effectiveness of the heating that theoretically could offer the torch.
  • the object of the invention is to propose an economical means for limiting the damage to the refractory lining of the distributor and the cover in the area of action plasma torch, without compromising the efficiency of the metal heating by this same torch.
  • the invention relates to a piece of refractory material, of shape ring, intended to be installed in a continuous metal flow distributor comprising at least one plasma torch for reheating the liquid metal, and the inner wall defines a downwardly flared space having an upper opening and a lower opening and allowing penetration of the lower end of said torch in said space.
  • the subject of the invention is also a distributor for continuous casting of metals.
  • a distributor for continuous casting of metals of the type comprising at least one plasma torch for reheating the liquid metal, and at least one cover crossed by said torch, characterized in that it comprises a part of refractory material of annular shape as defined above, said part being fixed to said cover, or to the refractory wall of said distributor and / or possibly to a or partitions delimiting a reheating compartment inside said distributor, and the flaring of its internal wall being turned towards the bottom of the distributor.
  • the invention consists in attaching to the distributor or to its cover an annular refractory piece whose inner wall surrounds the end of the plasma torch and deflects the radiation it receives towards the metal.
  • This piece ring protects the coverings of the distributor and the cover, and can be the only part of the distributor to be made of a material having particularly resistance elevated to the radiation of the arc. It can be designed to be used during casting or a single sequence and therefore be changed with each repair of the coating of the distributor. It can also, especially if it is ceramic, be recoverable and usable during several flows or several sequences.
  • annular part Another notable advantage of this annular part is that the return to the metal liquid from the arc radiation it receives improves the thermal efficiency of the plasma torch by increasing the share of radiation that actually reaches the metal.
  • FIGS. 1a and 1b show a distributor of continuous casting of steel 1 according to prior art.
  • a continuous casting machine (not shown) equipped with two ingot molds.
  • he comprises an external metal carcass 2, internally coated with a refractory 3.
  • the interior space of the distributor 1 has a flared shape upwards to allow after the casting easy removal of the refractory lining 1 by simply reversing the distributor 1.
  • the liquid steel 4 (not shown in FIG. 1a) reaches distributor 1 coming from a pocket (not shown), and is introduced into it via a tube in refractory 5 connected to the outlet orifice of the pocket. This tube 5 protects the liquid steel 4 against atmospheric reoxidation.
  • nozzles 6, 6 ' Draining of liquid steel 4 in the molds not shown is carried out by nozzles 6, 6 '.
  • Refractory tubes 7 connected to nozzles 6, 6 ' protect the liquid steel 4 against atmospheric reoxidation during its path between the distributor 1 and the mold which corresponds to each nozzle 6 6 '.
  • the example of distributor 1 shown is generally rectangular in shape and is internally divided into four compartments by refractory walls 8, 9, 10.
  • Two walls 8, 9 are oriented perpendicular to the long sides of the distributor 1; the wall 10 is oriented parallel to the long sides of the distributor and connects the other two walls 8, 9.
  • the walls 8, 9, 10 first define a first compartment 11 for the arrival of the metal liquid 4, into which opens the tube 5 connected to the bag.
  • Liquid steel 4 crosses then the wall 10 which, for this purpose, is perforated by a pipe 12, and thus enters a second compartment 13 which, in the example shown, constitutes a projection side of the distributor 1 located opposite the liquid metal inlet tube 5 4.
  • He passes then in the third and fourth compartments 14 and 15, thanks to pipes 16, 17 which perforate the walls 8, 9, 10. It is in these compartments 14, 15 that are located the nozzles 6, 6 'overhanging the molds of the continuous casting machine.
  • the liquid steel reheating device 4 comprises a plasma torch 18 of a type known in itself. Schematically, it comprises a cathode 19 in one material such as thoriated tungsten, connected to the negative pole of the generator supplying the torch, and surrounded by a metallic envelope 20, for example made of copper, which can play the role of anode.
  • a plasma torch 18 of a type known in itself.
  • it comprises a cathode 19 in one material such as thoriated tungsten, connected to the negative pole of the generator supplying the torch, and surrounded by a metallic envelope 20, for example made of copper, which can play the role of anode.
  • the metal casing 20 only behaves as an anode when striking the arc; but if the torch is of the blown plasma type, this metal casing 20 is constantly connected to the positive pole of the generator supplying the torch.
  • anode 22 is installed, for example, by a steel bar cooled over at least part of its length, and connected to the positive pole of the generator supplying the torch. Between cathode 19 and metal liquid 4 which is in contact with anode 22 therefore creates an electric arc 23 through which passes plasma gas, so as to heat the liquid steel 4 present in the second compartment 13, which will be called "heating compartment".
  • the radiation of the arc 23 causes rapid wear of the refractory 3 covering the distributor 1 in the heating compartment 13, wall 10 and refractories 25 covering the cover 24.
  • This wear can eventually go to their superficial melting, with all the previously mentioned problems it causes.
  • the distributor according to the invention shown in Figures 2a and 2b is a improvement of the previous distributor (their common elements are designated by same references in FIGS. 1 and 2), in which the above problem is solved by economically.
  • the heating compartment 13 was placed in the distributor 1 an annular piece 28 of a refractory material having a resistance high to the radiation of the electric arc 23.
  • this part annular 28 bears on the refractory lining 3 of the casing of the distributor 1 and on the wall 10 which separates the heating compartment 13 from the compartment 11 for the arrival of the liquid steel 4 in the distributor 1. It could also be made integral with the coating 25 of the cover 24.
  • the internal wall 29 of the annular part 28 has a frustoconical shape, and has its inclined slope turned towards the surface of the metal liquid 4.
  • the placement and dimensions of this annular part 28 are such that the lower end of the plasma torch 18, when in use, is located below of the upper opening 30 of the annular part 28, and preferably substantially lower than said upper opening 30. In this way, the part of the radiation from the electric arc 23 which would normally strike the partition 10 and the refractories 3, 25 covering the heating compartment 13 and the cover 24 is very largely stopped by the internal wall 29 of the annular part 28, and is returned towards the metal liquid 4 present in the heating compartment 13.
  • the annular part 28 was made of tabular alumina. Under the same conditions, it was found that equal torch usage power (about 300 kW), it could be increased by 14 ° C the temperature of the liquid steel 4 in the heating compartment 13, against 10 ° C. when the annular part 28 is not used.
  • the annular part 28 is made of a solid refractory capable of resist the radiation from the arc 23 for the entire duration of the use of the distributor 1 and of its coating 3, either a casting from a single pocket or a casting in sequence of several consecutive pockets. Materials such as tabular alumina, spinel alumina, silicon carbide are well suited for this use.
  • the use of the annular part 28 avoids having to coat the entire heating compartment 13 of the distributor 1 and its cover 24 with such refractories, and thus decreases the overall cost of refractories the installation.
  • a material with radiation resistance for example a ceramic with a melting temperature of around 2000 ° C
  • a ceramic would, moreover, the advantage of having an excellent reflection power of the radiation of the arc 23, which would further improve the thermal performance of the installation.
  • the interior and exterior shape of the annular part 28 shown in FIG. 2 is, of course, just one example. It is clear that its interior space can have, for example, the shape of a pyramid trunk and not a cone trunk. Its external shape is likewise to be adapted to the geometry of the heating compartment 13 of the distributor 1.
  • the distributor according to the invention shown in FIG. 3 constitutes an example adaptation of the invention to a distributor 31 of generally strictly rectangular shape, in which it is not possible, for reasons of space, to provide a single reheating compartment through which all the cast metal would pass, as in the example in FIGS. 1 and 2. It is provided, like the preceding distributor 1, two nozzles 32, 32 ', each extended by a refractory tube 33, 33' which plunges in an ingot mold not shown.
  • the distributor 31 is supplied with liquid steel 34 by a refractory tube 35 connected by its upper end to a pocket, not shown.
  • the liquid steel 34 leaving the tube 35 opens into a central compartment 36 materialized by a first pair of refractory partitions 37, 37 ′ blocking the distributor 31 over its entire width and located on either side of the tube 35.
  • These first partitions 37, 37 ′ are provided perforations 38, 38 'which allow the passage of the liquid steel 34 in two heating compartments 39, 39 ′ contiguous to the central compartment 36.
  • These heating compartments 39, 39 ' are each delimited by one of the first partitions 37, 37 'and by another refractory partition forming part of a second pair 40, 40'.
  • these torches 44, 44 ′ are of the plasma transferred, the floor 45 of the distributor 31 is crossed, in line with the compartments of reheating 39, 39 ', by anodes 46, 46' similar to those described above.
  • the refractory elements materializing the compartments of reheating 39, 39 ' are completed by annular parts 49, 49' similar in their functions and their design in the annular part 28 previously described and represented on Figure 2.
  • their interior space is frustoconical, with a wall oriented towards the liquid metal 34 present in the compartment reheating 39, 39 'corresponding.
  • the annular parts 49, 49 ' are mounted integral with partitions 37, 40, 37 ', 40' delimiting the compartments of reheating 39, 39 ', but they could also be fixed only to the refractory lining of the distributor 31, or to the covers 43, 43 '.
  • the distributors which have been described and represented are only examples of implementation of the invention, which can easily be adapted to other types of distributors for continuous casting of steel or other metals.
  • the distributor has one or more compartments space clearly delimited by one or more partitions: it is enough to stay in the spirit of the invention that the part of the arc radiation from the plasma torch which would come normally strike the cover crossed by the torch and the side walls of the distributor is stopped by the internal wall of the annular part and returned to the metal, therefore in direction of the dispatcher bottom.
  • the annular part or parts may only be attached to the refractory wall of the distributor or to the cover.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Plasma Technology (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Discharge Heating (AREA)
  • Electrolytic Production Of Metals (AREA)
EP98400563A 1997-04-23 1998-03-11 Zwischengefäss mit mindestens einem Plasmabrenner für die Wiederaufheizung von geschmolzenen Metallen Expired - Lifetime EP0875319B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9705014 1997-04-23
FR9705014A FR2762535B1 (fr) 1997-04-23 1997-04-23 Repartiteur de coulee continue des metaux, du type comportant au moins une torche a plasma pour le rechauffage du metal

Publications (2)

Publication Number Publication Date
EP0875319A1 true EP0875319A1 (de) 1998-11-04
EP0875319B1 EP0875319B1 (de) 2002-06-19

Family

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EP98400563A Expired - Lifetime EP0875319B1 (de) 1997-04-23 1998-03-11 Zwischengefäss mit mindestens einem Plasmabrenner für die Wiederaufheizung von geschmolzenen Metallen

Country Status (7)

Country Link
US (1) US6110416A (de)
EP (1) EP0875319B1 (de)
AT (1) ATE219402T1 (de)
CA (2) CA2295393A1 (de)
DE (1) DE69806094T2 (de)
ES (1) ES2176924T3 (de)
FR (1) FR2762535B1 (de)

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* Cited by examiner, † Cited by third party
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RU2454295C2 (ru) * 2010-08-26 2012-06-27 Российская Федерация, от имени которой выступает государственный заказчик - Министерство промышленности и торговли Российской Федерации (Минпромторг России) Конструкция двухручьевого ковша с камерами для плазменного подогрева жидкого металла
RU2477197C1 (ru) * 2011-11-23 2013-03-10 Российская Федерация, от имени которой выступает Министерство промышленности и торговли Российской Федерации (Минпромторг России) Промежуточный ковш для разливки стали с камерами для плазменного подогрева жидкого металла
RU2478021C1 (ru) * 2011-12-28 2013-03-27 Федеральное Государственное Унитарное Предприятие "Центральный научно-исследовательский институт черной металлургии им. И.П. Бардина" (ФГУП "ЦНИИчермет им. И.П. Бардина") Промежуточный ковш мнлз для плазменного подогрева металла
RU2481174C1 (ru) * 2012-01-18 2013-05-10 Общество с ограниченной ответственностью "АГНИ-К" Промежуточный ковш
RU2490089C1 (ru) * 2012-03-19 2013-08-20 Федеральное государственное бюджетное учреждение науки Объединенный институт высоких температур Российской академии наук (ОИВТ РАН) Двухручьевой промежуточный ковш установки непрерывной разливки стали
WO2015179680A2 (en) 2014-05-21 2015-11-26 Novelis Inc. Mixing eductor nozzle and flow control device
CN105837230B (zh) * 2016-03-22 2019-02-05 北京利尔高温材料股份有限公司 一种中间包复合工作衬及其制作方法与中间包
CN108356254A (zh) * 2018-02-13 2018-08-03 东北大学 一种异形多流连铸感应加热中间包装置
CN109193288B (zh) * 2018-08-09 2023-10-10 云南科威液态金属谷研发有限公司 一种运动件间的导电系统
CN111215614B (zh) * 2018-11-26 2025-07-29 上海安可科技股份有限公司 中间包烘烤器
CN114226664B (zh) * 2021-12-30 2023-09-15 江西慧高导体科技有限公司 一种连续熔炼炉及具有该连续熔炼炉的铸锭系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59110741A (ja) * 1982-12-17 1984-06-26 Nippon Steel Corp プラズマア−ク加熱における着火方法
US4686687A (en) * 1986-03-04 1987-08-11 Nippon Steel Corporation Anode system for plasma heating usable in a tundish
JPH03138052A (ja) * 1989-10-23 1991-06-12 Nkk Corp 加熱装置付きのタンディッシュ
EP0453188A2 (de) * 1990-04-19 1991-10-23 The BOC Group plc Plasmabeheizung einer Tundisher
JPH03285745A (ja) * 1990-03-30 1991-12-16 Nkk Corp 鋼の連続鋳造方法及び装置

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DE3031689A1 (de) * 1980-08-22 1982-03-04 MTU Motoren- und Turbinen-Union München GmbH, 8000 München Keramische brennkammer
AT382890B (de) * 1982-10-05 1987-04-27 Voest Alpine Ag Plasmaschmelzofen
JPH0740831Y2 (ja) * 1989-04-28 1995-09-20 日本碍子株式会社 バーナータイル
JP3035217B2 (ja) * 1996-05-28 2000-04-24 東京窯業株式会社 溶融金属用容器の羽口れんが

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59110741A (ja) * 1982-12-17 1984-06-26 Nippon Steel Corp プラズマア−ク加熱における着火方法
US4686687A (en) * 1986-03-04 1987-08-11 Nippon Steel Corporation Anode system for plasma heating usable in a tundish
JPH03138052A (ja) * 1989-10-23 1991-06-12 Nkk Corp 加熱装置付きのタンディッシュ
JPH03285745A (ja) * 1990-03-30 1991-12-16 Nkk Corp 鋼の連続鋳造方法及び装置
EP0453188A2 (de) * 1990-04-19 1991-10-23 The BOC Group plc Plasmabeheizung einer Tundisher

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Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 225 (C - 247) 16 October 1984 (1984-10-16) *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 354 (M - 1155) 6 September 1991 (1991-09-06) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 119 (M - 1225) 25 March 1992 (1992-03-25) *

Also Published As

Publication number Publication date
DE69806094T2 (de) 2002-12-19
ATE219402T1 (de) 2002-07-15
DE69806094D1 (de) 2002-07-25
CA2295393A1 (fr) 2000-04-10
ES2176924T3 (es) 2002-12-01
EP0875319B1 (de) 2002-06-19
FR2762535B1 (fr) 1999-05-28
FR2762535A1 (fr) 1998-10-30
CA2235202A1 (fr) 1998-10-23
US6110416A (en) 2000-08-29

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