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WO2019096808A1 - Procédé pour la préparation d'une masse fondue métallique dans un four - Google Patents

Procédé pour la préparation d'une masse fondue métallique dans un four Download PDF

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Publication number
WO2019096808A1
WO2019096808A1 PCT/EP2018/081137 EP2018081137W WO2019096808A1 WO 2019096808 A1 WO2019096808 A1 WO 2019096808A1 EP 2018081137 W EP2018081137 W EP 2018081137W WO 2019096808 A1 WO2019096808 A1 WO 2019096808A1
Authority
WO
WIPO (PCT)
Prior art keywords
atomization
furnace
degree
supplied
feed device
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.)
Ceased
Application number
PCT/EP2018/081137
Other languages
German (de)
English (en)
Inventor
Harmen Johannes Oterdoom
Erwan FLOCH
Adriaan Scheltema BEDUIN
Christian Kempe
Andreas Liedtke
Ralf NÖRTHEMANN
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.)
SMS Group GmbH
Original Assignee
SMS Group GmbH
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 SMS Group GmbH filed Critical SMS Group GmbH
Publication of WO2019096808A1 publication Critical patent/WO2019096808A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
    • C21C5/5217—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
    • F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces heated electrically, with or without any other source of heat
    • F27B3/085—Arc furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
    • F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type furnaces
    • F27B3/18—Arrangements of devices for charging
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/0033—Charging; Discharging; Manipulation of charge charging of particulate material
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/18—Charging particulate material using a fluid carrier
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0001—Positioning the charge
    • F27D2003/0006—Particulate materials
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F27D2003/168—Introducing a fluid jet or current into the charge through a lance
    • F27D2003/169—Construction of the lance, e.g. lances for injecting particles
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/18—Charging particulate material using a fluid carrier
    • F27D2003/185—Conveying particles in a conduct using a fluid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to a method for producing a metallic melt in an oven, in which metallic material is melted in the working space of the furnace, wherein material to be melted is fed via a feed device into the working space of the furnace.
  • Called DC stoves This sometimes results in insufficient mixing with hot gas.
  • degree of atomization depends on the condition of the delivered material, d. H. the fineness of the granular material supplied.
  • the presence of too low a degree of atomization of the supplied material is just as harmful as too high a degree of the same.
  • the material to be introduced often has a consistency such as dust or sand, whereby the amount of the material to be introduced is process-related.
  • the amount that is discharged through the exhaust gas from the oven must be adjusted accordingly in the oven. In previously known solutions, therefore, there is often no adequate balance for the reflow process in the oven.
  • the proportion of material entering the bath should be large enough to produce a cooling effect, but not so large that the material can no longer be absorbed by the process.
  • the invention is therefore based on the object, a method of the type mentioned in such a way that an improved energy efficiency is possible. Furthermore, the protection of the furnace should be improved. Finally, it should be achieved that the process stability of the process is increased. It is also important to achieve a favorable balance between the electrical energy input and its use for the melting of the estate.
  • the solution to this problem by the invention is characterized in that the material fed in via the feed device is subjected to targeted atomization on entering the working space of the furnace by pneumatic, mechanical and / or magnetic elements when passing through the feed device.
  • the melting is preferably carried out by means of at least one arc.
  • the supplied material is deflected according to a first embodiment of the invention when passing through the feed device by at least one gas jet.
  • the gas jet can be a jet of hydrogen and / or carbon dioxide. It is also possible to use a gas jet of carbon monoxide (CO), a mixture of carbon monoxide and hydrogen (CO + H 2 ), recirculated furnace gas, a gas from other process stages in the plant, and an inert gas such as argon (Ar). , If you work in a closed furnace with a gas mixture of carbon monoxide and hydrogen, the recycling of the gas is particularly easy to accomplish. For controlling or regulating the atomization it can be provided that the gas jet is changed in its flow velocity in order to achieve a defined degree of atomization.
  • the gas jet is changed in its angle of incidence to the flow of the supplied material in order to achieve a defined degree of atomization.
  • Another embodiment of the invention provides that the supplied material is deflected when passing through the feed device by at least one baffle.
  • the position or the position of the at least one baffle can be changed in order to achieve a defined degree of atomization.
  • the shape of the at least one baffle can be changed in order to achieve a defined degree of atomization.
  • a further embodiment of the invention provides that the supplied material is deflected by at least one magnet when passing through the feed device.
  • the atomization can take place in the closed loop in such a way that there is a defined degree of atomization during the introduction of the material via the feed device.
  • the feeder is thus designed according to the present invention in a special way to influence the degree of atomization of the supplied material can.
  • the measures or elements provided for this purpose can be mechanical, pneumatic or magnetic.
  • the invention relates primarily to a feed system for an oven with an open bath, in which a certain amount of dust is required to protect the melt metallurgical vessel.
  • the proposed method makes it possible to produce a certain degree of atomization and thus to influence or control the process and in particular the flow of material.
  • thermocouples are integrated in the furnace (in particular in its side wall or ceiling) in order to constantly record the current temperature.
  • a further advantage is that the thermal load on the ceiling and the side wall of the furnace can be reduced. Furthermore, it is advantageous that a lower gas generation takes place in the bath, since a prereduction can take place, which leads to lower instabilities in the bath. There is thus a lower risk of boiling up or eruptions.
  • An advantageous further improvement can be achieved in that the furnace is formed with a height which is greater than is usually the case. Thus, the introduced material has a longer fall path, resulting in an improved interaction between the means for atomization and the introduced Good.
  • FIG. 1 schematically shows an electric arc furnace for melting metallic material, in which material is supplied via a feed device to the working space of the furnace, wherein a first degree of atomization of the supplied material is present,
  • FIG. 2 is a schematic representation of the situation according to FIG. 1, when there is a higher degree of atomization, FIG.
  • FIG. 3 schematically in the illustration according to FIG. 1 the situation when there is an even higher degree of atomization
  • FIG. 4 schematically in the representation according to FIG. 1 the situation when there is too much local cooling during the supply of material
  • FIG. 5 is a schematic representation of the situation according to FIG. 1, when there is a higher degree of atomization in comparison with FIG. 4, FIG.
  • FIG. 6 shows the plan view of a part of the working space of the furnace, wherein 2 different configurations are indicated in the supply of material
  • Fig. 7 shows three different embodiments of the feeding device, wherein the degree of atomization of the material to be supplied is influenced by means of pneumatic elements
  • FIG. 8 shows in the illustration according to FIG. 7 three further embodiments of the feeding device, again influencing the degree of atomization of the material to be supplied by means of pneumatic elements, 9 three different embodiments of the feeding device, wherein the degree of atomization of the material to be supplied is influenced by means of mechanical elements,
  • Fig. 10 in the illustration of Figure 9 three further embodiments of the feeder, which in turn by means of mechanical elements, the degree of atomization of the material to be supplied is influenced
  • Fig. 10 in the illustration of Figure 9 three further embodiments of the feeder, which in turn by means of mechanical elements
  • Fig. 12 shows three different embodiments of the feeding device, wherein by means of magnetic elements, the degree of atomization of the supplied
  • FIG. 1 shows a furnace 2 in which an arc 8 is generated by means of an electrode 9 and melt 1 is thus produced. From the top, several supply devices 3 project into the furnace chamber, via which material 4 to be melted is supplied. If the material 4 impinges on the bath of the melt 1 via the feed devices 3, there is a certain degree of atomization depending on the consistency of the material 4.
  • the indicated here as a dust cone feed region of the material 4 has the consequence that in the area in which the material 4 occurs on the surface of the melt 1, a certain amount of thermal insulation is given.
  • the arrows shown in FIG. 1 indicate how heat from the melt 1 rises upwards.
  • FIGS. 7 to 12 show in detail the measures mentioned with which the degree of atomization of the supplied material 4 is influenced, by which is meant, in particular, a regulation such that the degree of atomization is influenced such that certain process parameters be complied with within specified limits.
  • the temperature in the furnace chamber is thought of, which can be detected and then regulated by the degree of atomization so that a predetermined value is maintained.
  • FIG. 7 it can be seen how, in the left partial image, first the material 4 passes through the feeding device 3 without any further measures.
  • pneumatic elements 5 influence the degree of atomization.
  • gas air, optionally also CO2 or H 2
  • FIG. 8 further possibilities are shown how by means of pneumatic elements, ie by adding the gas stream, the degree of atomization of the material 4 is influenced.
  • FIG. 9 shows the use of mechanical elements 6 to influence the degree of atomization of the material 4.
  • a variable in the fleas stowage element can be positioned so that depending on its fleas, the degree of atomization of the material 4 is varied.
  • the left partial image in FIG. 9 shows the unaffected supply of the material 4, said element 6 in the middle and right partial image is located once in the middle region of the extension of the delivery device 3 and once in its lower region.
  • FIG. 10 shows a similar solution when mechanical elements 6 are used, these elements being designed here as baffles or baffles. By their positioning, alignment and shaping again the degree of atomization of the material 4 can be influenced.
  • FIG. 11 where a splitter, with which the current or the flow of the material to be supplied is divided, is used as the mechanical element for controlling the atomization.
  • the left and the middle partial image in FIG. 11 show the ones that have not yet been influenced Flow of the material 4, while the effect of said splitter 6 can be seen in the right panel.
  • Figure 12 shows the use of magnetic elements 7 for influencing the flow of material 4 through the feeder 3 and thus the degree of atomization of the material 4. However, this presupposes that the conveyed material 4 reacts to magnetic forces.
  • a first undisturbed flow can be selectively disturbed and achieved in such a way that the material to be supplied atomizes to the desired extent.
  • said elements are to be arranged at suitable positions within the flow path of the material to be supplied.
  • Reducing the gas temperature in the furnace also reduces the costs that would otherwise be incurred for the cooling of the gas behind the furnace. For this purpose, a correspondingly lower equipment is required.
  • the side walls and ceiling area of the oven are better protected by improved atomization and are less exposed to radiation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

L'invention concerne un procédé pour la préparation d'une masse fondue métallique (1) dans un four (2), dans lequel un matériau métallique est fondu dans l'espace de travail du four (2), le matériau à faire fondre étant introduit dans l'espace de travail du four (2) via un dispositif d'introduction (3). Pour obtenir une efficacité énergétique améliorée, une meilleure protection du four et une stabilité plus élevée du procédé, selon l'invention, le matériau (4) introduit via le dispositif d'introduction (3) est soumis à une pulvérisation ciblée lors de l'entrée dans l'espace de travail du four (2) par des éléments pneumatiques (5), mécaniques (6) et/ou magnétiques (7) lors du passage dans le dispositif d'introduction (3).
PCT/EP2018/081137 2017-11-20 2018-11-14 Procédé pour la préparation d'une masse fondue métallique dans un four Ceased WO2019096808A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017220655.1 2017-11-20
DE102017220655.1A DE102017220655A1 (de) 2017-11-20 2017-11-20 Verfahren zur Herstellung einer metallischen Schmelze in einem Ofen

Publications (1)

Publication Number Publication Date
WO2019096808A1 true WO2019096808A1 (fr) 2019-05-23

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ID=64316554

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/081137 Ceased WO2019096808A1 (fr) 2017-11-20 2018-11-14 Procédé pour la préparation d'une masse fondue métallique dans un four

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DE (1) DE102017220655A1 (fr)
WO (1) WO2019096808A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940551A (en) * 1973-03-30 1976-02-24 Allmanna Svenska Elektriska Aktiebolaget Apparatus and method for the melt reduction of iron oxides
EP0418656A1 (fr) * 1989-09-20 1991-03-27 Fuchs Systemtechnik Gmbh Procédé et appareillage pour l'introduction simultanée dans un métal à l'état liquide d'un gaz et de granules de matières solides
JPH03291353A (ja) 1990-04-05 1991-12-20 Nkk Corp 電気炉立上げ法
JP2000119720A (ja) 1998-10-08 2000-04-25 Nkk Corp 溶融還元炉への製鉄ダストの装入方法及び装置
DE69622587T2 (de) 1995-05-01 2003-03-27 Alabama Power Co., Birmingham Verfahren zur herstellung von gusseisen
US20060185473A1 (en) * 2005-01-31 2006-08-24 Materials & Electrochemical Research Corp. Low cost process for the manufacture of near net shape titanium bodies
CN203595403U (zh) 2013-12-02 2014-05-14 四川金广实业（集团）股份有限公司 用于矿热炉下料管的下料控制装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2116445C3 (de) * 1971-04-03 1973-09-13 Fried. Krupp Gmbh, 4300 Essen Verfahren zur Erzeugung von Stahl
US5263689A (en) * 1983-06-23 1993-11-23 General Electric Company Apparatus for making alloy power
US4999051A (en) * 1989-09-27 1991-03-12 Crucible Materials Corporation System and method for atomizing a titanium-based material
JP3291353B2 (ja) 1993-04-08 2002-06-10 三洋電機株式会社 回転式スクロ−ル圧縮機

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940551A (en) * 1973-03-30 1976-02-24 Allmanna Svenska Elektriska Aktiebolaget Apparatus and method for the melt reduction of iron oxides
EP0418656A1 (fr) * 1989-09-20 1991-03-27 Fuchs Systemtechnik Gmbh Procédé et appareillage pour l'introduction simultanée dans un métal à l'état liquide d'un gaz et de granules de matières solides
JPH03291353A (ja) 1990-04-05 1991-12-20 Nkk Corp 電気炉立上げ法
DE69622587T2 (de) 1995-05-01 2003-03-27 Alabama Power Co., Birmingham Verfahren zur herstellung von gusseisen
JP2000119720A (ja) 1998-10-08 2000-04-25 Nkk Corp 溶融還元炉への製鉄ダストの装入方法及び装置
US20060185473A1 (en) * 2005-01-31 2006-08-24 Materials & Electrochemical Research Corp. Low cost process for the manufacture of near net shape titanium bodies
CN203595403U (zh) 2013-12-02 2014-05-14 四川金广实业（集团）股份有限公司 用于矿热炉下料管的下料控制装置

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