EP0319836B1 - Procédé et appareil pour la conduite d'un gazéificateur à fusion - Google Patents

Procédé et appareil pour la conduite d'un gazéificateur à fusion Download PDF

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Publication number
EP0319836B1
EP0319836B1 EP88119930A EP88119930A EP0319836B1 EP 0319836 B1 EP0319836 B1 EP 0319836B1 EP 88119930 A EP88119930 A EP 88119930A EP 88119930 A EP88119930 A EP 88119930A EP 0319836 B1 EP0319836 B1 EP 0319836B1
Authority
EP
European Patent Office
Prior art keywords
oxygen
inert gas
supply
nozzles
flow
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.)
Expired - Lifetime
Application number
EP88119930A
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German (de)
English (en)
Other versions
EP0319836A1 (fr
Inventor
Bogdan Vuletic
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.)
Deutsche Voest Alpine Industrieanlagenbau GmbH
Original Assignee
Deutsche Voest Alpine Industrieanlagenbau 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 Deutsche Voest Alpine Industrieanlagenbau GmbH filed Critical Deutsche Voest Alpine Industrieanlagenbau GmbH
Publication of EP0319836A1 publication Critical patent/EP0319836A1/fr
Application granted granted Critical
Publication of EP0319836B1 publication Critical patent/EP0319836B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
    • C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
    • C21B13/002—Reduction of iron ores by passing through a heated column of carbon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C21B2100/44—Removing particles, e.g. by scrubbing, dedusting

Definitions

  • the invention relates to a method according to the preamble of claim 1 and a melter gasifier for carrying it out.
  • a method for the direct production of molten pig iron from lumpy iron ore in which the iron ore is reduced to sponge iron in a reduction shaft furnace by means of a hot reducing gas and is then fed to a melter gasifier.
  • the coal and injected oxygen-containing gas are used to generate the heat and the reducing gas required to melt the sponge iron.
  • a fluidized bed is formed from the coal introduced from above and the oxygen-containing gas blown into the lower part of the carburetor, in which the iron sponge particles, which are also supplied above, are braked and be melted.
  • radial oxygen nozzles distributed at the same height over the circumference of the melting gasifier are provided, which are fed from a ring line.
  • the oxygen nozzles are inevitably water-cooled in order to be able to withstand the high temperatures which prevail inside the melter gasifier, in particular in front of these nozzles. In this area in front of the nozzles, the high temperature converts the fluidized bed into a doughy or liquid mass.
  • cooling water supply for the nozzles fails, the nozzles are inevitably damaged. A failure of the cooling water supply also automatically leads to failure of the entire system, so that there is also the risk that the liquid or pasty fluid bed mass enters the nozzles and clogs them.
  • the inert gas also serves as a cooling medium for the emergency cooling of the nozzles, and together with the water remaining in the nozzles, it solidifies the doughy fluid bed mass on the end faces of the nozzles, thereby additionally protecting the fluid bed mass that has not solidified will.
  • the amount of inert gas required depends on the operating pressure of the melter gasifier at the time of the event triggering the introduction of the inert gas. Since a certain operating pressure can be assigned to each of these events, the amount of inert gas introduced is expediently controlled as a function of the type of event triggering the introduction.
  • the iron sponge formed by reducing the iron ore passes through downpipes 3 into a melter gasifier 4, into which a solid carbon carrier, for example coal or coke, is also introduced via a line 5 and an oxygen-containing gas is blown in via nozzles 6.
  • a solid carbon carrier for example coal or coke
  • the rising oxygen-containing gas and the particles of the carbon carrier sinking in the opposite direction form a fluidized bed in the melting gasifier 4, which first slows down the falling iron sponge particles and in which these are then melted by the heat generated during the reaction of the carbon carrier with the oxygen.
  • the molten pig iron collecting at the bottom of the melter gasifier 4 and the liquid slag floating thereon are periodically tapped by means of a tap 7.
  • the gas formed in the reaction of the carbon carrier with the oxygen is led out of the melter gasifier 4 via a line 8 and cleaned in a cyclone 9, before possibly reaching the shaft furnace 1 as a reducing gas through line 2 after cooling to a suitable temperature.
  • the nozzles 6 arranged at equal intervals over the circumference of the melter gasifier 4 are connected to a ring line 10, to which the oxygen-containing gas is supplied via a line 11.
  • a control valve 12 and a flow rate measuring device 13 are located in this line 11. The supplied amount of oxygen-containing gas is thus measured by the measuring device 13 and adjusted using the control valve 12.
  • An inert gas in particular nitrogen, can be fed into the line 11 through a line 14 which opens into the line 11.
  • a control valve 15 and a flow rate measuring device 16 are also used.
  • the control valve 12 for the oxygen-containing gas is automatically closed and the control valve 15 is opened for the inert gas when the flow rate determined by the measuring device 13 falls below a predetermined value, so that this now instead of the oxygen-containing gas by Nozzles 6 flows into the melter 4.
  • the inert gas can simultaneously act as a cooling medium for the nozzles and protect them from damage caused by excessive thermal stress if the cooling water supply to them fails.
  • the supply of the inert gas is preferably controlled as a function of time, in such a way that first the maximum amount of gas for the respective event is passed through the nozzles 6 and then a controlled throttling takes place via the control valve 15.
  • the initial amount of the inert gas depends on the type of event triggering the supply of this gas or on the Operating pressure in the melter gasifier 4 at the time of this event.
  • another line 17 also opens into the line 14 for the supply of inert gas, in which a control valve 18 is inserted.
  • the inert gas can thus be supplied via two parallel lines, with a larger amount of gas being supplied via line 14 than via line 17.
  • the control valves 15 and 18 are controlled in such a way that at the start of feeding in inert gas both Fittings are opened and after a predetermined period of time the control valve 15 is closed, so that only a relatively small amount of inert gas is supplied via line 17.
  • This training has the advantage that the control valve 15 does not require continuous control, but can be designed as a simple open-close valve. This also leads to greater plant security.

Landscapes

  • 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)
  • Manufacture Of Iron (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (8)

1. Procédé de conduite d'un gazéificateur à fusion, dans lequel les matières premières contenant du fer ou l'éponge de fer obtenue par réduction directe au départ de celles-ci sont fondues par addition de supports de carbone et addition d'un gaz contenant de l'oxygène amené par des tuyères à oxygène dans un lit fluidisé réalisé de cette manière et sont réduites en fer brut liquide ou en matières premières pour acier, caractérisé en ce que, pour protéger les tuyères à oxygène (6) contre une interruption ou une diminution de l'adduction d'oxygène en dessous d'un débit prédéterminé ainsi que contre une interruption du refroidissement par eau des tuyères à oxygène (6), l'adduction d'oxygène existant encore est supprimée et est remplacée par une adduction d'un gaz inerte amené par les tuyères à oxygène (6) dans le gazéificateur à fusion (4).
2. Procédé selon la revendication 1, caractérisé en ce que l'adduction du gaz inerte est diminuée après une durée déterminée.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le débit du gaz inerte introduit est réglé en fonction de la nature de l'évènement qui a provoqué cette introduction.
4. Procédé selon, la revendication 3, caractérisé en ce que, en cas de mise à l'arrêt d'un gazéificateur à fusion et après diminution progressive de la pression de fonctionnement et de l'adduction d'oxygène, le débit de gaz inerte est réglé à environ 15% et, en cas d'interruption de l'adduction d'oxygène à la pression de service normale, à environ 25% et, en cas d'interruption du refroidissement par eau, à environ 30% du débit normal du gaz contenant de l'oxygène.
5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce qu'on utilise de l'azote comme gaz inerte.
6. Gazéificateur à fusion avec un dispositif d'introduction pour l'introduction de supports de carbone et avec des tuyères pour l'adduction d'un gaz contenant de l'oxygène et avec un lit fluidisé pour mettre en oeuvre le procédé selon l'une des revendications 1 à 5, dans lequel une conduite annulaire est prévue pour l'adduction du gaz contenant de l'oxygène et servant à alimenter les tuyères à oxygène, caractérisé en ce que la conduite annulaire (10) est connectée à une conduite d'alimentation (11) pour le gaz contenant de l'oxygène ainsi qu'à une conduite d'alimentation (14) pour les gaz inertes, et en ce que des accessoires de réglage de débit (12, 15) sont disposés dans les deux conduites d'alimentation (11, 14).
7. Gazéificateur à fusion selon la revendication 6, caractérisé en ce qu'un dispositif de mesure de débit (13) est disposé dans la conduite d'adduction 11 pour le gaz contenant de l'oxygène et que les accessoires de réglage de débit (12, 15) peuvent être contrôlés en fonction du débit mesuré de gaz contenant de l'oxygène de façon à ce que, en cas de diminution prédéterminée du débit mesuré de gaz contenant de l'oxygène, l'accessoire de réglage de débit (12) pour le gaz contenant de l'oxygène est fermé et que l'accessoire de réglage de débit de gaz (15) pour le gaz inerte est ouvert.
8. Gazéificateur à fusion selon la revendication 6 ou 7, caractérisé en ce que la conduite d'adduction pour le gaz inerte est constituée de deux conduites parallèles (14, 17) pour des débits d'adduction différents, lesquelles sont équipées chacune de leur propre accessoire de débit (15, 18) et que, au début de l'adduction de gaz inerte, les deux accessoires de réglage de débit (15, 18) sont tous deux ouverts et que, après une période prédéterminée, seul l'accessoire de réglage de débit (18) dans la conduite (17) reste ouvert avec un débit d'adduction plus faible.
EP88119930A 1987-12-10 1988-11-30 Procédé et appareil pour la conduite d'un gazéificateur à fusion Expired - Lifetime EP0319836B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3742156 1987-12-10
DE3742156A DE3742156C1 (de) 1987-12-10 1987-12-10 Verfahren zum Betrieb eines Einschmelzvergasers und Einschmelzvergaser zu dessen Durchfuehrung

Publications (2)

Publication Number Publication Date
EP0319836A1 EP0319836A1 (fr) 1989-06-14
EP0319836B1 true EP0319836B1 (fr) 1991-07-24

Family

ID=6342448

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88119930A Expired - Lifetime EP0319836B1 (fr) 1987-12-10 1988-11-30 Procédé et appareil pour la conduite d'un gazéificateur à fusion

Country Status (12)

Country Link
US (1) US4891062A (fr)
EP (1) EP0319836B1 (fr)
JP (1) JPH01283308A (fr)
KR (1) KR960001709B1 (fr)
AU (1) AU611215B2 (fr)
BR (1) BR8806514A (fr)
CA (1) CA1310826C (fr)
DD (1) DD283651A5 (fr)
DE (1) DE3742156C1 (fr)
RU (1) RU1838428C (fr)
UA (1) UA12803A (fr)
ZA (1) ZA889147B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT395435B (de) * 1991-02-19 1992-12-28 Voest Alpine Ind Anlagen Verfahren zur inbetriebnahme einer anlage zur herstellung von roheisen oder stahlvormaterial, sowie anlage zur durchfuehrung des verfahrens
US5354356A (en) * 1992-10-06 1994-10-11 Bechtel Group Inc. Method of providing fuel for an iron making process
US6197088B1 (en) 1992-10-06 2001-03-06 Bechtel Group, Inc. Producing liquid iron having a low sulfur content
US5320676A (en) * 1992-10-06 1994-06-14 Bechtel Group, Inc. Low slag iron making process with injecting coolant
US5397376A (en) * 1992-10-06 1995-03-14 Bechtel Group, Inc. Method of providing fuel for an iron making process
US5958107A (en) * 1993-12-15 1999-09-28 Bechtel Croup, Inc. Shift conversion for the preparation of reducing gas
AT407994B (de) * 1999-08-24 2001-07-25 Voest Alpine Ind Anlagen Verfahren zum betreiben eines einschmelzvergasers
US8118085B2 (en) * 2008-02-06 2012-02-21 Leprino Foods Company Heat exchanger

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3499638A (en) * 1967-11-13 1970-03-10 John E Allen Method of cooling damaged blast furnace cooling elements
US4047937A (en) * 1972-12-04 1977-09-13 United States Steel Corporation Method for controlling the operation of a steel refining converter
JPS54152615A (en) * 1978-05-24 1979-12-01 Ishikawajima Harima Heavy Ind Co Ltd Suspended layer type direct reduction iron making process
AT367453B (de) * 1980-04-03 1982-07-12 Voest Alpine Ag Verfahren und vorrichtung zur herstellung von fluessigem roheisen oder stahlvormaterial
DE3034539C2 (de) * 1980-09-12 1982-07-22 Korf-Stahl Ag, 7570 Baden-Baden Verfahren und Vorrichtung zur direkten Erzeugung von flüssigem Roheisen aus stückigem Eisenerz
JPS5757817A (en) * 1980-09-19 1982-04-07 Kawasaki Steel Corp Method for controlling bottom blowing gas in steel making by composite top and bottom blown converter
DE3318005C2 (de) * 1983-05-18 1986-02-20 Klöckner CRA Technologie GmbH, 4100 Duisburg Verfahren zur Eisenherstellung

Also Published As

Publication number Publication date
AU611215B2 (en) 1991-06-06
JPH01283308A (ja) 1989-11-14
US4891062A (en) 1990-01-02
CA1310826C (fr) 1992-12-01
DD283651A5 (de) 1990-10-17
ZA889147B (en) 1989-11-29
KR960001709B1 (ko) 1996-02-03
KR890010215A (ko) 1989-08-07
DE3742156C1 (de) 1988-10-13
AU2459888A (en) 1989-06-15
EP0319836A1 (fr) 1989-06-14
RU1838428C (ru) 1993-08-30
UA12803A (uk) 1997-02-28
JPH0368081B2 (fr) 1991-10-25
BR8806514A (pt) 1989-08-22

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