WO1991000366A1 - Procede et dispositif pour le chauffage d'un four metallurgique - Google Patents

Procede et dispositif pour le chauffage d'un four metallurgique Download PDF

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Publication number
WO1991000366A1
WO1991000366A1 PCT/DE1990/000487 DE9000487W WO9100366A1 WO 1991000366 A1 WO1991000366 A1 WO 1991000366A1 DE 9000487 W DE9000487 W DE 9000487W WO 9100366 A1 WO9100366 A1 WO 9100366A1
Authority
WO
WIPO (PCT)
Prior art keywords
burner
oxygen
fuel
coal
bores
Prior art date
Application number
PCT/DE1990/000487
Other languages
German (de)
English (en)
Inventor
Thomas Hoster
Heinz Humberg
Original Assignee
Mannesmann 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 Mannesmann Ag filed Critical Mannesmann Ag
Priority to BR909007498A priority Critical patent/BR9007498A/pt
Publication of WO1991000366A1 publication Critical patent/WO1991000366A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
    • 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
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00006—Liquid fuel burners using pure oxygen or O2-enriched air as oxidant
    • 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
  • burners and electrodes which can be introduced via the burner oxygen and dusty ge fuels.
  • further details about the burner heating are not given in the document. In many cases, only gas or oil burners - such as in the procedure according to
  • the invention is based on the object of improving the state of the art by means of a new method in such a way that heating and melting down can be carried out safely and economically, and of specifying a device which is particularly suitable.
  • this object is achieved in that 4 to 15 kg / t of liquid metal produced as fuel
  • At least one bar of oxygen emerging from the burner is burned with diffuse flame formation.
  • Non-ferrous metals are treated. Even with medium additions, an increase in output of around 10% and a reduction in the supply of electrical energy by around 55 kWh / t can be achieved.
  • the process parameters were preferably set so that the pressure of the emerging
  • Oxygen is at least 0.1 bar above the internal pressure in the furnace that the
  • Dusty coal is supplied in quantities of 5 to 10 kg / t of liquid metal produced, that the speed of the carrier gas is at least 50 m / s and the pressure in the oxygen line (pre-pressure) to 12 to 16 bar, preferably 13 to 15 bar , is set.
  • pre-pressure the pressure in the oxygen line
  • Fuel is preferably a dusty coal with 8 to 15% share
  • Carbon to the carrier gas is 10 to 20.
  • Operating phase (s) are the burners with a
  • Purge gas preferably air, at least in the
  • Fuel channel feeds to the channels keep clear.
  • the amount supplied is - depending on the burner size - preferably 170 to 200 Nm 3 / h.
  • a burner is provided, one of two
  • the annular channel opens into an enlarged annular space of a distributor, wherein the annular space from the opposite side, the feed side, open and arranged coaxially to the shaft bores, which at their
  • Oxygen channel connected oxygen supply line is listed in the following device claims.
  • Fig. 1 is a diagram of a plant for the
  • FIG. 2 shows the arc furnace according to FIG. 1
  • Fig. 3 is a performance diagram of a burner
  • Pressure conveyor 5 from a storage silo 6 with dusty coal, which is classified in an intermediate screening device 7, if necessary.
  • the coal withdrawn from the pressure conveyors 5 is supplied via a nitrogen source, not shown
  • the supply of oxygen to the burners 3 and 4 takes place via two lines 9.
  • the furnace 1 is also known
  • Provide device 10 for determining the exhaust gas analysis which is used to regulate the mass flows supplied to the burners, also taking into account the efficiency related to different types and compositions of coal
  • the amount of exhaust gas is eaten according to the known tracer method using a heater to be introduced into the furnace.
  • FIG. 4 shows the structure of the burner: on a shaft 13 consisting of two concentric tubes 11 and 12 and projecting longitudinally displaceably into the furnace, the actual core of the burner is one of several
  • annular channel 15 formed between the two tubes 11 and 12 opens into an enlarged annular space 16 of the distributor 14. From the opposite side, that is to say the one annular channel 15 facing away from the feed side, open in the annular space 16 six annular and coaxial to the shaft 13 bores 17 which on the feed side to a cylindrical
  • Collection room 18 are connected.
  • a fuel line 8 for supplying the coal is flanged to the collecting space 18 at the end and coaxially with the distributor 14.
  • Oxygenation is ring-shaped
  • Collection space 19 connected, which surrounds a cup-shaped support body 20, in which the bores 17 are arranged.
  • the collecting space 19 stands over six radial and between each
  • the annular space 16 is so through the use of a correspondingly shaped insert body 23
  • Design of the distributor 14 also has the advantage of low wear of the parts carrying the dusty coal.
  • Fuel line 8 is a flow divider with a baffle plate 27 provided with three openings 28th switched, the one loaded with coal dust
  • the method according to the invention was applied to a 140 t UHP electric arc furnace, the system shown in FIG. 1 being used.
  • the two burners 3 and 4 were arranged such that one burner 3, inserted through the slag door 25, protruded into the furnace 1 and the other burner 4 was offset by 90 to the burner 3 through a corresponding opening through the
  • spot area 26 is directed between two electrodes, while the burner 3 is not positioned symmetrically between two electrodes.
  • An anthracite dust coal was used as coal with the following elementary analysis of the raw coal:
  • Oxygen demand of O min 1.73 m 3 O 2 / kg
  • the average batch sequence was as follows: after a first batch of scrap of about 76 t in the arc furnace 1, in which a
  • Oxygen inside the burner as a result of a malfunction is guaranteed to burn back
  • the dusty coal had one
  • the Burner removed from the furnace and the melt finished and tapped using electrode heating.
  • the tapping temperature was on average about 1580 ° C.
  • the tapping weight was around 140 t and was distributed over two pans.
  • the tubes of the burner shaft 13 were made of stainless steel and due to the different local conditions
  • the outer diameter of the shaft was approximately 70 mm.
  • the wear on the burner mouth was limited even after numerous batch sequences. Both ferritic and teniti stainless steels were melted. For the melted austeni ti see steels, the specific

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

Dans le cas d'un procédé pour le chauffage d'un four métallurgique, en particulier d'un four à arc alimenté en ferraille ou autres matières solides similaires, où de l'oxygène et du combustible sont introduits par au moins un brûleur au-dessus de la coulée au travers de la paroi du four, le combustible étant amené par un flux de gaz porteur entourant le canal d'oxygène interne comme un anneau, un résultat particulièrement économique est obtenu par le fait que comme combustible sont amenés de 4 à 15 kg/t de charbon pulvérisé avec une granulométrie de <200 νm, dans un gaz porteur inerte à légèrement réducteur, à une vitesse minimale de 45 m/s, au moins pendant la fusion de la matière chargée, et brûlés, sous formation diffuse de flammes, de manière st÷chiométrique à légèrement surst÷chiométrique par l'oxygène sortant du brûleur à une vitesse sensiblement sonique et à une pression minimale de 1 bas. De plus, il est décrit un brûleur particulièrement apte à la réalisation du procédé.
PCT/DE1990/000487 1989-07-03 1990-06-25 Procede et dispositif pour le chauffage d'un four metallurgique WO1991000366A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BR909007498A BR9007498A (pt) 1989-07-03 1990-06-25 Processo e dispositivo para aquecer um forno metalurgico

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3921807.4 1989-07-03
DE3921807A DE3921807A1 (de) 1989-07-03 1989-07-03 Verfahren und vorrichtung zum beheizen eines metallurgischen ofens

Publications (1)

Publication Number Publication Date
WO1991000366A1 true WO1991000366A1 (fr) 1991-01-10

Family

ID=6384181

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1990/000487 WO1991000366A1 (fr) 1989-07-03 1990-06-25 Procede et dispositif pour le chauffage d'un four metallurgique

Country Status (8)

Country Link
EP (1) EP0480944A1 (fr)
JP (1) JPH05500847A (fr)
BR (1) BR9007498A (fr)
CA (1) CA2063711A1 (fr)
DE (1) DE3921807A1 (fr)
ES (1) ES2023064A6 (fr)
WO (1) WO1991000366A1 (fr)
ZA (1) ZA905023B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997009566A1 (fr) * 1995-09-07 1997-03-13 Voest-Alpine Industrieanlagenbau Gmbh Procede de combustion d'un combustible
EP0787966A1 (fr) * 1996-02-09 1997-08-06 Linde Aktiengesellschaft Procédé pour fondre ainsi pour le maintien à température de métaux
US6558614B1 (en) 1998-08-28 2003-05-06 Voest-Alpine Industrieanlagenbau Gmbh Method for producing a metal melt and corresponding multifunction lance

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4434369C2 (de) * 1994-09-15 1997-08-07 Mannesmann Ag Verfahren und Vorrichtung zum metallurgischen Behandeln von Eisen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1099959A (en) * 1965-10-28 1968-01-17 Janos Miklos Beer Improvements in or relating to burners for pulverised coal or like solid fuel or for liquid or gaseous fuel
FR2472019A1 (fr) * 1979-12-19 1981-06-26 Daido Steel Co Ltd Procede de fabrication d'acier au four a arc, comportant le soufflage d'un materiau carbonace dans l'acier fondu
FR2535018A1 (fr) * 1982-10-22 1984-04-27 Air Liquide Bruleur a charbon pulverise
EP0164878A2 (fr) * 1984-05-11 1985-12-18 JAMES HOWDEN &amp; COMPANY LIMITED Procédé pour opérer un four métallurgique
FR2634787A1 (fr) * 1988-08-01 1990-02-02 Siderurgie Fse Inst Rech Procede d'obtention d'un laitier moussant dans un four electrique d'acierie

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1433424B2 (de) * 1962-11-29 1971-01-28 Fried Krupp GmbH, 4300 Essen Mehrofen Schmelzanlage, insbesondere zur Stahlherstellung aus Schrott und Koh lungsmitteln
DD107526A1 (fr) * 1973-05-09 1974-08-05
DE2541086A1 (de) * 1975-09-15 1977-03-17 Toshin Steel Co Verfahren und vorrichtung zur stahlerzeugung
US4458607A (en) * 1982-09-02 1984-07-10 Shell Oil Company Process and burner for the partial combustion of finely divided solid fuel
GB8509629D0 (en) * 1985-04-15 1985-05-22 British Steel Corp Melting ferrous solids
GB8516143D0 (en) * 1985-06-26 1985-07-31 British Steel Corp Melting of metals
DE3542829A1 (de) * 1985-12-04 1987-06-11 Kloeckner Cra Tech Verfahren und duese zur stahlherstellung aus festen einsatzstoffen
DE3629055A1 (de) * 1986-08-27 1988-03-03 Kloeckner Cra Tech Verfahren zum gesteigerten energieeinbringen in elektrolichtbogenoefen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1099959A (en) * 1965-10-28 1968-01-17 Janos Miklos Beer Improvements in or relating to burners for pulverised coal or like solid fuel or for liquid or gaseous fuel
FR2472019A1 (fr) * 1979-12-19 1981-06-26 Daido Steel Co Ltd Procede de fabrication d'acier au four a arc, comportant le soufflage d'un materiau carbonace dans l'acier fondu
FR2535018A1 (fr) * 1982-10-22 1984-04-27 Air Liquide Bruleur a charbon pulverise
EP0164878A2 (fr) * 1984-05-11 1985-12-18 JAMES HOWDEN &amp; COMPANY LIMITED Procédé pour opérer un four métallurgique
FR2634787A1 (fr) * 1988-08-01 1990-02-02 Siderurgie Fse Inst Rech Procede d'obtention d'un laitier moussant dans un four electrique d'acierie

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997009566A1 (fr) * 1995-09-07 1997-03-13 Voest-Alpine Industrieanlagenbau Gmbh Procede de combustion d'un combustible
US6142765A (en) * 1995-09-07 2000-11-07 Vost-Alpine Industrieanlagenbau Gmbh Process for burning fuel
EP0787966A1 (fr) * 1996-02-09 1997-08-06 Linde Aktiengesellschaft Procédé pour fondre ainsi pour le maintien à température de métaux
US6558614B1 (en) 1998-08-28 2003-05-06 Voest-Alpine Industrieanlagenbau Gmbh Method for producing a metal melt and corresponding multifunction lance

Also Published As

Publication number Publication date
DE3921807A1 (de) 1991-01-10
ZA905023B (en) 1991-04-24
ES2023064A6 (es) 1991-12-16
EP0480944A1 (fr) 1992-04-22
JPH05500847A (ja) 1993-02-18
CA2063711A1 (fr) 1991-01-04
BR9007498A (pt) 1992-05-19

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