EP0071755A1 - Procédé pour le pré- et surchauffage des AOD convertisseurs vides - Google Patents
Procédé pour le pré- et surchauffage des AOD convertisseurs vides Download PDFInfo
- 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- Withdrawn
Links
Images
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)
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 (fr) | 1983-02-16 |
Family
ID=6138639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82105900A Withdrawn EP0071755A1 (fr) | 1981-08-05 | 1982-07-02 | Procédé pour le pré- et surchauffage des AOD convertisseurs vides |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0071755A1 (fr) |
JP (1) | JPS5827919A (fr) |
DE (1) | DE3130972A1 (fr) |
ES (1) | ES514776A1 (fr) |
Cited By (4)
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 (fr) * | 2015-04-08 | 2016-10-13 | Sms Group Gmbh | Convertisseur |
Families Citing this family (2)
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)
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 |
-
1981
- 1981-08-05 DE DE19813130972 patent/DE3130972A1/de not_active Withdrawn
-
1982
- 1982-07-02 EP EP82105900A patent/EP0071755A1/fr not_active Withdrawn
- 1982-07-26 JP JP13020882A patent/JPS5827919A/ja active Pending
- 1982-08-05 ES ES514776A patent/ES514776A1/es not_active Expired
Patent Citations (9)
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)
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 (fr) * | 2015-04-08 | 2016-10-13 | Sms Group Gmbh | Convertisseur |
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 |
---|---|
ES514776A1 (es) | 1983-05-01 |
JPS5827919A (ja) | 1983-02-18 |
DE3130972A1 (de) | 1983-02-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
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. |