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WO1989001982A1 - Procede et dispositif de minimisation de la consommation des gaz de travail lors de l'application de procedes metallurgiques - Google Patents

Procede et dispositif de minimisation de la consommation des gaz de travail lors de l'application de procedes metallurgiques Download PDF

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Publication number
WO1989001982A1
WO1989001982A1 PCT/DE1988/000464 DE8800464W WO8901982A1 WO 1989001982 A1 WO1989001982 A1 WO 1989001982A1 DE 8800464 W DE8800464 W DE 8800464W WO 8901982 A1 WO8901982 A1 WO 8901982A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
pressure
pressure fluctuations
frequency
temperature
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/DE1988/000464
Other languages
German (de)
English (en)
Inventor
Horst Kappes
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.)
Vodafone GmbH
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
Priority claimed from DE19873728526 external-priority patent/DE3728526C1/de
Priority claimed from DE19873735835 external-priority patent/DE3735835A1/de
Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to JP88506167A priority Critical patent/JPH02504651A/ja
Publication of WO1989001982A1 publication Critical patent/WO1989001982A1/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
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath
    • 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
    • C21C5/30—Regulating or controlling the blowing
    • 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
    • C21C7/072—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
    • 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
    • C21C2250/00—Specific additives; Means for adding material different from burners or lances
    • C21C2250/02—Hot oxygen
    • 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
    • C21C2250/00—Specific additives; Means for adding material different from burners or lances
    • C21C2250/06—Hollow electrode

Definitions

  • the invention relates to a method for minimizing the
  • Pages 537 to 579 scientifically examined the basis for the design of nozzles for blowing gas into melts and indicated that it is necessary for the practical implementation of such methods for introducing gas to be able to set a range between a minimum and a maximum gas flow .
  • a minimum mass flow of gas must of course not be undercut, because otherwise the feed pipe or the nozzle will clog.
  • the interpretation rule known from the cited reference provides that a
  • the amount of oxygen required is determined by the melt size and mainly by the carbon to be removed.
  • the required oxygen flow is then determined by the timing, which e.g. is determined by the arc furnace. This defines the nozzle geometry because, as described, work is carried out in an area that is limited at the top and bottom.
  • a device which could extend the control range of the nozzle to smaller mass flows would thus lead to significant cost savings.
  • the object of the invention is now not only to combine clogging of the supply line for gases such as argon, oxygen or nitrogen, which ends below the liquid level, but also to minimize the consumption of these gases.
  • the value of the speed of sound a f ⁇ RT (, R; constants) changes proportionally YT, but the speed of the gas increases proportionally T with a constant mass flow, the speed of sound at a temperature T_> T, with a mass flow rh" ⁇ m., so that the nozzle at temperature T_ can be kept free with a reduced mass flow compared to that at T. But even during an active purging or treatment time, heating the gas is advantageous.
  • the nozzle cross-section and operating pressure of the gas stand for one Certain mode of operation of the purge gas in a certain ratio to one another and are designed for a maximum supply of the gas.
  • the control range is very narrow. By heating the gas according to the invention, the control range can be easily expanded by extending the control range downwards.
  • the process gas to be heated can be passed through a heat exchanger before being introduced into the liquid metal, in which its temperature, depending on the possibilities, is heated to several hundred degrees above the ambient temperature.
  • a heat exchanger When blowing gas into melts, savings in increasing the gas temperature to about 500 degrees C from 35% to 5% are achieved.
  • Pressure fluctuations are used to check the minimum permissible process gas flow.
  • the invention now makes use of the knowledge that the easily detectable pressure fluctuations in the inner tube can be used to minimize gas consumption.
  • Process was a pressure sensor attached to the inner tube of the gas supply nozzle. The pressure fluctuations caused by the formation and tearing off of individual bubbles were thus recognized.
  • the pressure fluctuations are strong enough to be recorded and processed as a signal.
  • the signal reliably shows the pressure fluctuations. It is therefore possible to control the gas flow control valve with the aid of this signal so that the gas flow is steadily reduced from a starting value until a threshold value of the pressure fluctuations is exceeded. After that it will
  • the valve is opened by a certain amount and the cycle starts again.
  • the pressure sensor can be connected at any location if a pressure line, which may be filled with a liquid, is led from the nozzle pipe to the pressure sensor.
  • Limit value can be recognized based on the pressure fluctuations caused by bubbling.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

Selon un procédé de minimisation de la consommation des gaz de travail lors de l'application de procédés métallurgiques, des gaz tels que l'argon, l'oxygène ou l'azote sont insufflés dans le métal fondu par une conduite d'alimentation composée d'une tubulure interne entourée d'une tubulure externe concentrique et qui se termine sous le niveau du liquide. Les gaz sont chauffés avant d'être insufflés. L'invention concerne également un dispositif d'application du procédé.
PCT/DE1988/000464 1987-08-24 1988-07-22 Procede et dispositif de minimisation de la consommation des gaz de travail lors de l'application de procedes metallurgiques Ceased WO1989001982A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP88506167A JPH02504651A (ja) 1987-08-24 1988-07-22 冶金学的プロセスにおけるプロセスガスの消費を最小化する方法

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19873728526 DE3728526C1 (en) 1987-08-24 1987-08-24 Method for minimising the process gas consumption in metallurgical processes
DEP3728526.2 1987-08-24
DE19873735835 DE3735835A1 (de) 1987-10-20 1987-10-20 Verfahren zur verringerung des prozessgasverbrauchs
DEP3735835.9 1987-10-20

Publications (1)

Publication Number Publication Date
WO1989001982A1 true WO1989001982A1 (fr) 1989-03-09

Family

ID=25859043

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1988/000464 Ceased WO1989001982A1 (fr) 1987-08-24 1988-07-22 Procede et dispositif de minimisation de la consommation des gaz de travail lors de l'application de procedes metallurgiques

Country Status (4)

Country Link
EP (1) EP0377597A1 (fr)
JP (1) JPH02504651A (fr)
ES (1) ES2010323A6 (fr)
WO (1) WO1989001982A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0723022A1 (fr) * 1995-01-23 1996-07-24 Linde Aktiengesellschaft Procédé pour le traitement de métaux en fusion par un gaz de traitement refroidé à une température bien inférieure à la température ambiante

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5236905B2 (ja) * 2007-07-18 2013-07-17 東京窯業株式会社 取鍋

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1165627B (de) * 1953-11-18 1964-03-19 Gutehoffnungshuette Sterkrade Verfahren und Vorrichtung zum Behandeln einer Eisenschmelze
GB1062591A (en) * 1962-07-04 1967-03-22 Internat Meehanite Metal Compa Improvements in or relating to the treatment of metals
FR2401453A1 (fr) * 1977-08-26 1979-03-23 British Steel Corp Procede de commande et de regulation
EP0045658A1 (fr) * 1980-08-06 1982-02-10 British Steel Corporation Procédé pour commander un passage d'amenée de gaz
EP0227952A1 (fr) * 1985-11-26 1987-07-08 Sumitomo Metal Industries, Ltd. Procédé de commande de la force de brassage et du débit d'un jet de gaz dans une lance sur la surface d'un bain métallurgique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1165627B (de) * 1953-11-18 1964-03-19 Gutehoffnungshuette Sterkrade Verfahren und Vorrichtung zum Behandeln einer Eisenschmelze
GB1062591A (en) * 1962-07-04 1967-03-22 Internat Meehanite Metal Compa Improvements in or relating to the treatment of metals
FR2401453A1 (fr) * 1977-08-26 1979-03-23 British Steel Corp Procede de commande et de regulation
EP0045658A1 (fr) * 1980-08-06 1982-02-10 British Steel Corporation Procédé pour commander un passage d'amenée de gaz
EP0227952A1 (fr) * 1985-11-26 1987-07-08 Sumitomo Metal Industries, Ltd. Procédé de commande de la force de brassage et du débit d'un jet de gaz dans une lance sur la surface d'un bain métallurgique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0723022A1 (fr) * 1995-01-23 1996-07-24 Linde Aktiengesellschaft Procédé pour le traitement de métaux en fusion par un gaz de traitement refroidé à une température bien inférieure à la température ambiante

Also Published As

Publication number Publication date
EP0377597A1 (fr) 1990-07-18
ES2010323A6 (es) 1989-11-01
JPH02504651A (ja) 1990-12-27

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