EP0071755A1 - Verfahren zum Vorwärmen und Aufheizen von leeren AOD-Konvertern - Google Patents

Verfahren zum Vorwärmen und Aufheizen von leeren AOD-Konvertern Download PDF

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Publication number
EP0071755A1
EP0071755A1 EP82105900A EP82105900A EP0071755A1 EP 0071755 A1 EP0071755 A1 EP 0071755A1 EP 82105900 A EP82105900 A EP 82105900A EP 82105900 A EP82105900 A EP 82105900A EP 0071755 A1 EP0071755 A1 EP 0071755A1
Authority
EP
European Patent Office
Prior art keywords
aod
oxygen
nozzle
converter
fuel
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.)
Withdrawn
Application number
EP82105900A
Other languages
German (de)
English (en)
French (fr)
Inventor
Gerhard Dr. c/o MG Burdett Gas Prod. Comp. Gross
Marijan Velikonja
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.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim 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 Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Publication of EP0071755A1 publication Critical patent/EP0071755A1/de
Withdrawn legal-status Critical Current

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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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising
    • 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
    • C21C5/005—Manufacture of stainless steel
    • 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
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • 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
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/48—Bottoms or tuyéres of converters
    • 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
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/44—Refractory linings
    • C21C5/445—Lining or repairing the taphole
    • C21C2005/446—Dry linings

Definitions

  • the invention relates to a method for preheating and heating empty AOD converters with a fuel-oxygen flame.
  • AOD converters are used to freshen stainless steel melts with mixtures of argon or nitrogen and oxygen. They essentially consist of the bricked-up converter vessel, in which one or more AOD nozzles are permanently installed above the floor, e.g. is known from DE-OS 2 065 105.
  • the AOD nozzle consists of an injection nozzle for blowing in the process gas containing oxygen. To avoid melting of the injection nozzle, it is surrounded by an annular nozzle, from which a jet of nitrogen or argon is emitted emerges as a protective gas at high speed.
  • a jet of nitrogen or argon is emitted emerges as a protective gas at high speed.
  • the lining of the converter In order to prevent the heat exchange between the melt and the colder lining, the lining of the converter must be preheated to a high temperature before filling, which is close to the temperature of the liquid melt. Such a high wall temperature can only be achieved economically with an oxygen flame. For this purpose, it is known to insert a fuel-oxygen burner into the converter opening from above and to remove it again before filling the converter.
  • the invention is therefore based on the object of providing a method for preheating and heating up empty AOD converters, which retains the advantages of the fuel-oxygen flame as a heat source without, however, requiring its own fuel-oxygen burner.
  • the fuel gas is preferably introduced through the injection nozzle for the process gas and the oxygen through the ring nozzle for the protective gas into the AOD converter.
  • additional fuel gas-oxygen nozzles corresponding to the AOD nozzles can also be installed in the converter wall above the bath level which forms in the filled converter.
  • ignition electrodes are installed centrally in the nozzles used to form the fuel gas-oxygen flames.
  • Both liquid gas and fuel gas can be used as fuel. Oil is not suitable as a fuel for safety reasons, since it cannot be completely removed by nitrogen flushing before and after the burner is used, and therefore a reaction with the process gas oxygen can occur.
  • a and 2 show the brick AOD converter 1, which is equipped with two AOD nozzles 2 and 3.
  • the process gas supply from argon and oxygen takes place through the line 5 provided with a valve 4 into the injection nozzle 6.
  • the protective gas nitrogen passes through the line 8 provided with a valve 7 into the ring nozzle 9.
  • a line 10 is provided with a valve 10 Line 11 connected through which fuel gas can be supplied.
  • a line 13 provided with a valve 12 is connected to the line 8 and serves to supply oxygen.
  • the AOD nozzle 3 has the same gas connections, but which are not shown in the drawing.
  • the valves 4, 7, 10 and 12 are automatic control valves which are controlled as a function of flow meters arranged in the lines. As is known, these details are not shown.
  • the empty AOD converter 1 is preheated and heated by fuel gas-oxygen flames 14, which are formed according to the invention by means of the AOD nozzles 2 and 3. This is described using the example of the AOD nozzle 2.
  • valves 4 and 7 closed and valves 10 and 12 open, fuel gas and oxygen flow into the AOD nozzle 2.
  • the oxygen is blown in through the concentric ring nozzle 9. Due to the small gap width of the concentric ring nozzle 9, the oxygen emerges at the speed of sound.
  • the expanding oxygen jet provides additional cooling at the nozzle outlet.
  • the high turbulent mixing results in a short externally mixing fuel gas-oxygen flame 14 which does not touch the opposite converter wall.
  • a reversal of the procedure is also possible.
  • the fuel gas is injected through the concentric ring nozzle 9 and the oxygen through the central injection nozzle 6.
  • the advantage of this arrangement is less expenditure on equipment, since the inerting of the oxygen and fuel gas lines can be dispensed with. Due to unstable burner behavior, however, the maximum possible burner output is reduced by 50%.
  • a fuel gas-oxygen nozzle 15 is additionally inserted, which is constructed in accordance with the AOD nozzles 2 and 3, but only has connections for fuel gas 16 and oxygen 17.
  • Several such fuel gas-oxygen nozzles 15 can also be installed in the converter wall. They are only necessary if the power of the fuel gas-oxygen flames 14 is too low. They are expediently arranged above the bath level which forms in the filled AOD converter. The advantage of this design is that these nozzles cannot be attacked by any process burn-off.
  • the wall temperature is measured via a built-in thermocouple 18 and regulated to the setpoint value by a temperature controller 19.
  • the burner output can be considerably reduced with fixed flow rates of fuel gas with oxygen.
  • the actual value of the amount of oxygen and the amount of fuel gas is therefore at constant admission pressures measured by the flow meter and controlled by the automatic control valves 4 and 7 to the specified setpoint.
  • FIG. 3 shows an AOD nozzle which is particularly suitable for the method according to the invention since it enables the fuel-oxygen mixture to be ignited when the AOD converter 1 is cold by an ignition electrode 24 integrated in the AOD nozzle.
  • the AOD nozzle initially consists of known parts, namely an inner tube 20 with connecting piece 21 for the supply of process gas or fuel gas, and an outer tube 22 with connection 23 for the supply of protective gas or oxygen.
  • an ignition electrode 24 with a square neck rod 25 ceramic insulation 26 and protective tube 27 is installed centrally in the inner tube 20.
  • the guide in the inner tube is carried out by webs 28, the attachment to the outer tube 22 by the connecting cylinder 29, screw insert 30 and lock nut 31.
  • the annular cross section that forms between the inner tube 20 and the protective tube 27 corresponds to the original cross section of the injection nozzle of the inner tube.
  • the kanthal rod 25 is bent at a right angle at the end and is flush with the ceramic insulation 26.
  • the ignition electrode can be pulled back by the screw insert 30 for replacement.
  • the flame is monitored by a UV probe, which is installed in a cooled protective tube above the converter opening in the exhaust hood.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Details (AREA)
EP82105900A 1981-08-05 1982-07-02 Verfahren zum Vorwärmen und Aufheizen von leeren AOD-Konvertern Withdrawn EP0071755A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3130972 1981-08-05
DE19813130972 DE3130972A1 (de) 1981-08-05 1981-08-05 "verfahren zum vorwaermen und aufheizen von leeren aod-konvertern"

Publications (1)

Publication Number Publication Date
EP0071755A1 true EP0071755A1 (de) 1983-02-16

Family

ID=6138639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82105900A Withdrawn EP0071755A1 (de) 1981-08-05 1982-07-02 Verfahren zum Vorwärmen und Aufheizen von leeren AOD-Konvertern

Country Status (4)

Country Link
EP (1) EP0071755A1 (ja)
JP (1) JPS5827919A (ja)
DE (1) DE3130972A1 (ja)
ES (1) ES514776A1 (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT394395B (de) * 1989-01-13 1992-03-25 Veitscher Magnesitwerke Ag Metallurgisches gefaess und anordnung desselben
FR2715882A1 (fr) * 1994-02-09 1995-08-11 Lorraine Laminage Procédé et dispositif de réchauffage ou de chauffage de la paroi interne d'un récipient métallurgique.
CN103233097A (zh) * 2013-05-03 2013-08-07 鄂州恺鑫铸业有限公司 一种可缩短不锈钢精炼时间的aod炉及其方法
WO2016162016A1 (de) * 2015-04-08 2016-10-13 Sms Group Gmbh Konverter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100380135B1 (ko) * 1998-12-16 2003-08-21 주식회사 포스코 전로의 출강구 내화물 보열버너
RU2710826C1 (ru) * 2018-08-31 2020-01-14 Акционерное общество "ЕВРАЗ НТМК Нижнетагильский металлургический комбинат" (АО "ЕВРАЗ НТМК") Футеровка днища конвертера с донными фурмами

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB947032A (en) * 1961-10-18 1964-01-22 Voest Ag Blast burner
DE1508280B1 (de) * 1965-11-19 1969-09-04 Union Carbide Corp Duese zum Behandeln von geschmolzenem Metall
DE1601276A1 (de) * 1967-04-17 1970-11-26 Air Reduction Doppelseitiger Sauerstoff-Brennstoff-Brenner
DE2065105A1 (de) * 1969-08-15 1972-11-30 Union Carbide Corp Metallurgischer Ofen Ausscheidung aus 2037808
US3897048A (en) * 1973-06-15 1975-07-29 Pennsylvania Engineering Corp Metallurgical vessel and method of operating same
DE2602178A1 (de) * 1975-07-30 1977-02-17 Uss Eng & Consult Verfahren zum einbrennen der feuerfesten auskleidung von bodenblasenden stahl-frischgefaessen
DE2624592B2 (de) * 1975-06-25 1977-07-21 Creusot Loire Paris, Sprunck, Emile, Moyeuvre-Grande, Moselle, (Frankreich) Vorrichtung zur aufheizung metallurgischer konverter
DE2816543A1 (de) * 1978-04-17 1979-10-25 Maximilianshuette Eisenwerk Verfahren zum erzeugen von stahl
US4208206A (en) * 1977-03-31 1980-06-17 Union Carbide Corporation Method for producing improved metal castings by pneumatically refining the melt

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB947032A (en) * 1961-10-18 1964-01-22 Voest Ag Blast burner
DE1508280B1 (de) * 1965-11-19 1969-09-04 Union Carbide Corp Duese zum Behandeln von geschmolzenem Metall
DE1601276A1 (de) * 1967-04-17 1970-11-26 Air Reduction Doppelseitiger Sauerstoff-Brennstoff-Brenner
DE2065105A1 (de) * 1969-08-15 1972-11-30 Union Carbide Corp Metallurgischer Ofen Ausscheidung aus 2037808
US3897048A (en) * 1973-06-15 1975-07-29 Pennsylvania Engineering Corp Metallurgical vessel and method of operating same
DE2624592B2 (de) * 1975-06-25 1977-07-21 Creusot Loire Paris, Sprunck, Emile, Moyeuvre-Grande, Moselle, (Frankreich) Vorrichtung zur aufheizung metallurgischer konverter
DE2602178A1 (de) * 1975-07-30 1977-02-17 Uss Eng & Consult Verfahren zum einbrennen der feuerfesten auskleidung von bodenblasenden stahl-frischgefaessen
US4208206A (en) * 1977-03-31 1980-06-17 Union Carbide Corporation Method for producing improved metal castings by pneumatically refining the melt
DE2816543A1 (de) * 1978-04-17 1979-10-25 Maximilianshuette Eisenwerk Verfahren zum erzeugen von stahl

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT394395B (de) * 1989-01-13 1992-03-25 Veitscher Magnesitwerke Ag Metallurgisches gefaess und anordnung desselben
FR2715882A1 (fr) * 1994-02-09 1995-08-11 Lorraine Laminage Procédé et dispositif de réchauffage ou de chauffage de la paroi interne d'un récipient métallurgique.
CN103233097A (zh) * 2013-05-03 2013-08-07 鄂州恺鑫铸业有限公司 一种可缩短不锈钢精炼时间的aod炉及其方法
CN103233097B (zh) * 2013-05-03 2014-12-17 鄂州恺鑫铸业有限公司 一种可缩短不锈钢精炼时间的aod炉及其方法
WO2016162016A1 (de) * 2015-04-08 2016-10-13 Sms Group Gmbh Konverter
CN107636174A (zh) * 2015-04-08 2018-01-26 Sms集团有限责任公司 转炉
CN107636174B (zh) * 2015-04-08 2019-12-27 Sms集团有限责任公司 转炉
RU2711692C2 (ru) * 2015-04-08 2020-01-21 Смс Груп Гмбх Конвертер

Also Published As

Publication number Publication date
JPS5827919A (ja) 1983-02-18
DE3130972A1 (de) 1983-02-24
ES514776A1 (es) 1983-05-01

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE FR GB IT NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840128

RIN1 Information on inventor provided before grant (corrected)

Inventor name: VELIKONJA, MARIJAN

Inventor name: GROSS, GERHARD, DR.C/O MG BURDETT GAS PROD. COMP.