EP0521523B1 - Procédé de conduite d'un cubilot - Google Patents

Procédé de conduite d'un cubilot Download PDF

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Publication number
EP0521523B1
EP0521523B1 EP92111337A EP92111337A EP0521523B1 EP 0521523 B1 EP0521523 B1 EP 0521523B1 EP 92111337 A EP92111337 A EP 92111337A EP 92111337 A EP92111337 A EP 92111337A EP 0521523 B1 EP0521523 B1 EP 0521523B1
Authority
EP
European Patent Office
Prior art keywords
carbon dioxide
furnace
zone
cupola furnace
cupola
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
EP92111337A
Other languages
German (de)
English (en)
Other versions
EP0521523A1 (fr
Inventor
Manfred Dr. Dipl.-Ing. Rossmann
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.)
Linde GmbH
Original Assignee
Linde 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 Linde GmbH filed Critical Linde GmbH
Publication of EP0521523A1 publication Critical patent/EP0521523A1/fr
Application granted granted Critical
Publication of EP0521523B1 publication Critical patent/EP0521523B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/16—Arrangements of tuyeres
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B11/00—Making pig-iron other than in blast furnaces
    • C21B11/02—Making pig-iron other than in blast furnaces in low shaft furnaces or shaft furnaces

Definitions

  • the invention relates to a method for operating a cupola furnace for the production of cast iron, in which the furnace shaft of the cupola furnace is filled with a corresponding insert or is constantly refilled and cast iron is removed from the bottom, in which wind, e.g. Air - optionally with additional oxygen, is supplied and the so-called blast furnace gas is discharged in the upper shaft area, the furnace shaft moving from top to bottom into a loading zone (5), a preheating zone (4), a melting zone (3), a wind zone (2) and a hearth zone (1) can be divided and in which a carbon gas carbon monoxide and / or carbon dioxide is fed to the furnace shaft.
  • wind e.g. Air - optionally with additional oxygen
  • a cupola furnace is fed with an insert of 500 kg, which is composed of 440 kg of pig iron and scrap, 47 kg of coke and 13 kg of additives, for example limestone.
  • This insert gradually decreases in the shaft of the cupola furnace and heats up in the preheating zone due to the gases flowing in countercurrent, which initially causes the thermal dissociation of the aggregates, i.e. that of the limestone according to the equation, at approx. 900 to 1000 ° C CaCO3 ---> CaO + CO2 he follows.
  • the melting of the iron insert then begins in the melting zone adjoining the preheating zone. The temperatures there are of the order of approx.
  • This carbon monoxide is important for the function and product quality of the cupola furnace, since it counteracts the burn-off of the insert iron, i.e. the formation of FeO, and also has an advantageous effect on the slag basicity.
  • the object of the present invention is therefore to provide a possibility (s) of being able to influence the carbon monoxide content in cupola furnaces, regardless of The level of the coke in the furnace and the amount of coke in the oven vary and can be set to a certain desired value.
  • This object is achieved according to the invention in that in order to set a desired, increased carbon monoxide content in the upper cupola region, carbon dioxide (CO2) is introduced in the wind zone in the wind zone (2) of the cupola in a suitable amount.
  • CO2 carbon dioxide
  • Another advantageous variant of the method according to the invention is that the carbon dioxide is introduced in the wind zone in a quantity-controlled manner, so that an approximately constant carbon monoxide level is achieved in the cupola furnace.
  • the regulation of an approximately constant level of CO can be achieved in that the carbon dioxide addition is increased accordingly with decreasing filling coke height.
  • a carbon dioxide addition is carried out in an order of magnitude which permits a reduction in the amount of coke.
  • gas supply quantities in the order of 30 to 500 m3 per hour, depending on the size of the coke reduction and the size of the furnace. In this way, savings on batch coke in the order of 1 to 3% are possible with the further advantage that melting capacity increases are achieved, because according to the Jungblut network diagram, less batch coke means a higher melting capacity.
  • the simultaneous supply of carbon dioxide and carbon monoxide can also be favorable. Since CO2 introduced in the wind zone of a cupola furnace acts as a cooling gas, a simultaneous addition of carbon monoxide to the carbon dioxide supply can be advantageous if the cooling effect is too strong, because CO burns in the wind zone, thus providing energy and at the same time increasing the amount of carbon dioxide, which in turn is available for reduction.
  • the carbon gases are provided in storage containers for the applications according to the invention reliably, with a constant composition and with optimal meterability.
  • a sometimes beneficial option is there in that the coal gases, especially carbon dioxide, are obtained from burner exhaust gases, in particular the exhaust gases from the cupola recuperator burner, and thus provide at least part of the gas quantity required.
  • the figure shows a cupola furnace on which an embodiment of the invention is shown.
  • a cupola shaft 11 with a loading opening 12, a top stage 13, a wind ring 14 with wind nozzles 15a and 15b, a bottom flap 16 as well as an iron tapping 17 and a slag tapping 18 is shown.
  • the numbers 1 to 5 and the corresponding dashed lines indicate the generic zone 5, the preheating zone 4, the melting zone 3, the wind zone 2 and finally the oven zone 1.
  • Lances 20a, b are arranged in the wind nozzles 15a and 15b for the furnace wind and are connected to an oxygen supply and a carbon dioxide supply outside the furnace.
  • a cupola furnace operation is now carried out, in which an application as described in the introduction is used. Only the amount of coke is significantly reduced and is significantly lower at around 37 kg (around 7% of the operating weight). 200 m3 of carbon dioxide per hour are now fed to the cupola furnace on lances 20a and 20b. With around 10 sets of insert that pass through the furnace per hour, this corresponds to a gas volume of 20 m3 per insert. The main part of the resulting from the coke in the oven Carbon dioxide is thus replaced by the direct supply of carbon dioxide gas.
  • the gas supply can be carried out constantly with little equipment - installation of a valve and a flow meter in the carbon dioxide supply.
  • a gas supply for example of the sawtooth type, which is synchronized with the addition of the inserts, is also comparatively simple, whereby starting from a lowest supply value shortly after the furnace has been charged with a new insert, the gas quantity is increased linearly up to a maximum value for the next loading, although the total the same amount of gas is maintained as with constant supply.
  • oxygen can likewise be supplied via the lances 20a and b, the amount of wind correspondingly reduced accordingly and thus higher furnace temperatures can be maintained in spite of the reduction in coke and the addition of carbon dioxide.
  • coal gas proposed according to the invention results in a further parameter in cupola furnace operation, with which the processes taking place in a cupola furnace can be advantageously influenced in many ways.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (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)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Secondary Cells (AREA)

Claims (7)

  1. Procédé de conduite d'un cubilot pour la production de fonte, dans lequel
    - on remplit la cuve du cubilot au préalable ou en continu d'une charge convenable et préléve la fonte dans la partie de fond,
    - on introduit dans la zone inférieure de la cuve, du vent, par exemple de l'air, le cas échéant additionné d'un apport d'oxygène, et on retire de la zone supérieure de la cuve, le gaz dénommé "gaz de gueulard", la cuve étant susceptible d'être subdivisée du haut vers le bas en une zone d'alimentation (5), une zone de préchauffage (4), une zone de fusion (3), une zone de vent (2) et une zone de creuset (1), et,
    - on amène à la cuve du cubilot un gaz carboné (monoxyde de carbone et/ou dioxyde de carbone)
    caractérisé en ce que pour obtenir la teneur augmentée souhaitée en monoxyde de carbone dans la zone supérieure du cubilot, on introduit du dioxyde de carbone (CO₂) en quantité appropriée dans le plan des tuyères à vent de la zone de vent (2) du cubilot.
  2. Procédé selon la revendication 1, caractérisé en ce que le dioxyde de carbone est introduit en quantités constantes.
  3. Procédé selon la revendication 1, caractérisé en ce que l'on réalise l'apport de dioxyde de carbone en quantités définies de façon à obtenir un niveau de monoxyde de carbone qui reste sensiblement constant dans le cubilot, par exemple une alimentation en gaz synchronisée avec l'apport des charges approximativement du type en dents de scie.
  4. Procédé selon les revendications 1 à 3, caractérisé en ce que l'apport de dioxyde de carbone est réalisé dans un ordre de grandeur tel qu'il autorise une réduction de la quantité de coke de la charge (mise au mille en coke).
  5. Procédé selon les revendications 1 à 4, caractérisé en ce que simultanément à l'apport de dioxyde de carbone, on réalise également une injection de monoxyde de carbone.
  6. Procédé selon les revendications 1 à 3, caractérisé en ce que le dioxyde de carbone est préparé à l'avance dans des réservoirs de stockage.
  7. Procédé selon les revendications 1 à 3, caractérisé en ce que le dioxyde de carbone est récupéré au moins partiellement sur des gaz d'échappement de brûleurs, en particulier des gaz d'échappement de brûleurs de récupérateurs de cubilot.
EP92111337A 1991-07-05 1992-07-03 Procédé de conduite d'un cubilot Expired - Lifetime EP0521523B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4122381A DE4122381A1 (de) 1991-07-05 1991-07-05 Verfahren zum betreiben eines kupolofens
DE4122381 1991-07-05

Publications (2)

Publication Number Publication Date
EP0521523A1 EP0521523A1 (fr) 1993-01-07
EP0521523B1 true EP0521523B1 (fr) 1995-09-06

Family

ID=6435565

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92111337A Expired - Lifetime EP0521523B1 (fr) 1991-07-05 1992-07-03 Procédé de conduite d'un cubilot

Country Status (4)

Country Link
EP (1) EP0521523B1 (fr)
AT (1) ATE127580T1 (fr)
DE (2) DE4122381A1 (fr)
ES (1) ES2079744T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19509366A1 (de) * 1995-03-15 1996-09-19 Linde Ag Verwertung von Eisenoxid und Eisen enthaltendem, staub und sandartigem Material
PL183679B1 (pl) * 1995-08-28 2002-06-28 Linde Gas Ag Sposób prowadzenia pieca szybowego
DE10117962B4 (de) * 2001-04-10 2006-12-07 At.Pro Tec Technologie-Team Gmbh Verfahren zur thermischen Behandlung von Rohmaterialien und zur Durchführung des Verfahrens
DE102007025663A1 (de) * 2007-06-01 2008-12-04 Linde Ag Verfahren zur gesteuerten Koksumsetzung in Kupolöfen
CN101428342B (zh) * 2008-12-18 2013-02-13 高尔荣 一种炼铁铸造系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE930930C (de) * 1950-06-10 1955-07-28 Heinrich Dr Ing E H Koppenberg Verfahren zum Betrieb eines Schachtofens mit hochkonzentriertem Sauerstoff
DE1132570B (de) * 1955-03-28 1962-07-05 Ruhrstahl Ag Verfahren zum Betrieb von Hochoefen, insbesondere Niederschachtoefen
US3630719A (en) * 1969-04-01 1971-12-28 Chemical Construction Corp Method of operating a cupola furnace
DE2315748A1 (de) * 1973-03-29 1974-12-19 Wests Manchester Ltd Schachtofen
US4309024A (en) * 1977-07-18 1982-01-05 Modern Equipment Company Cupola with auxiliary gas generator

Also Published As

Publication number Publication date
ATE127580T1 (de) 1995-09-15
ES2079744T3 (es) 1996-01-16
DE4122381A1 (de) 1993-01-07
DE59203547D1 (de) 1995-10-12
EP0521523A1 (fr) 1993-01-07

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