EP0521523A1 - Procédé de conduite d'un cubilot - Google Patents

Procédé de conduite d'un cubilot Download PDF

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Publication number
EP0521523A1
EP0521523A1 EP92111337A EP92111337A EP0521523A1 EP 0521523 A1 EP0521523 A1 EP 0521523A1 EP 92111337 A EP92111337 A EP 92111337A EP 92111337 A EP92111337 A EP 92111337A EP 0521523 A1 EP0521523 A1 EP 0521523A1
Authority
EP
European Patent Office
Prior art keywords
zone
cupola
furnace
wind
gas
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.)
Granted
Application number
EP92111337A
Other languages
German (de)
English (en)
Other versions
EP0521523B1 (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 topped up and cast iron melt is removed from the bottom, with wind, e.g. Air, and optionally additional oxygen, and the top gas is discharged in the upper shaft area, and the furnace shaft can be divided into a charging zone, a preheating zone, a melting zone, a wind zone and an oven zone during operation.
  • wind e.g. Air
  • a cupola furnace is loaded 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, e.g. limestone.
  • This insert gradually sinks 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 CaCO3 ---> CaO + CO2 he follows. Melting of the iron insert then begins in the melting zone adjoining the preheating zone. The temperatures there are of the order of approx. 1400 ° C and the coke in use is already incandescent in this zone.
  • the object of the present invention is therefore to provide a possibility (s) of being able to influence the CO content in cupola furnaces, regardless of The level of the coke in the furnace and the proportion 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 CO content in the cupola furnace, in particular in the melting zone, a coal gas (CO2 or CO) in a suitable amount at a suitable point, preferably in the region of the wind or melting zone, in the Cupola is introduced.
  • a coal gas CO2 or CO
  • the CO level is increased precisely in the zone in which CO is formed anyway by reduction.
  • the CO level in the melting zone in the cupola furnace can be effectively increased with just a few cubic meters per hour, in particular to largely compensate for the phases of low CO formation, for example when the filling coke level is low.
  • carbon monoxide is an expensive supply gas and the process will therefore not be used in this form.
  • Another advantageous variant of the method according to the invention is that the coal gas is introduced in the wind zone in a quantity-controlled manner, so that an approximately constant CO level is achieved in the cupola furnace.
  • the regulation of an approximately constant level of CO can be achieved by increasing the addition of carbon gas as the filling coke height decreases.
  • the addition of carbon gas is carried out on a scale that allows a reduction in the amount of coke.
  • These are 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.
  • CO2 in most variants of the invention is advantageous for price and technical reasons, but it can also be beneficial to supply CO and CO2 simultaneously. Since CO2 introduced in the wind zone of a cupola furnace acts as a cooling gas, a simultaneous addition of CO to the CO2 supply can be advantageous if the cooling effect is too strong (CO burns in the wind zone, thus provides energy and at the same time increases the CO2 amount, 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 CO2, are obtained from burner exhaust gases, in particular the exhaust gases from the cupola recuperator burner, and thus provide at least part of the required amount of gas.
  • 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 numerical zone 5 Within the furnace, the numerical zone 5, the preheating zone 4, the melting zone 3, the wind zone 2 and finally the hearth zone 1 are indicated by the numbers 1 to 5 and the associated dashed lines.
  • 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 coke produced in the oven CO2 is thus replaced by the direct supply of CO2 gas.
  • the gas supply can be carried out constantly with little equipment - installation of a valve and a flow meter in the CO2 supply.
  • a gas supply synchronized with the addition of the inserts is also comparatively simple, whereby starting from a lowest supply value shortly after the furnace has been loaded 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 also be supplied via the lances 20a and b, the amount of wind in correlation can thus be suitably reduced and thus higher furnace temperatures can be maintained in spite of the reduction in coke and CO2 addition.

Landscapes

  • 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)
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 true EP0521523A1 (fr) 1993-01-07
EP0521523B1 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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0762068A1 (fr) * 1995-08-28 1997-03-12 Linde Aktiengesellschaft Procédé pour l'opération d'un four à cuve métallurgique utilisant l'oxygène comme comburant, et four à cuve pour la réalisation dudit procédé
EP1997915A1 (fr) * 2007-06-01 2008-12-03 Linde Aktiengesellschaft Procédé de transformation commandé de coke en cubilots
CN101428342B (zh) * 2008-12-18 2013-02-13 高尔荣 一种炼铁铸造系统

Families Citing this family (2)

* 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
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

Citations (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
FR1144895A (fr) * 1955-03-28 1957-10-18 Ruhrstahl Ag Procédé pour faire des économies de combustibles pendant la marche des hauts fourneaux, notamment des fours à cuve de faible hauteur
DE2015580A1 (fr) * 1969-04-01 1970-10-15
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

Patent Citations (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
FR1144895A (fr) * 1955-03-28 1957-10-18 Ruhrstahl Ag Procédé pour faire des économies de combustibles pendant la marche des hauts fourneaux, notamment des fours à cuve de faible hauteur
DE2015580A1 (fr) * 1969-04-01 1970-10-15
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
GIESSEREI. Bd. 77, Nr. 5, 5. März 1990, DUSSELDORF DE Seiten 142 - 148 F.NEUMANN. 'OPTIMIERUNG DES KUPOLOFENSCHMELZPROZESSES DURCH SAUERSTOFFZUSATZ.' *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0762068A1 (fr) * 1995-08-28 1997-03-12 Linde Aktiengesellschaft Procédé pour l'opération d'un four à cuve métallurgique utilisant l'oxygène comme comburant, et four à cuve pour la réalisation dudit procédé
EP1997915A1 (fr) * 2007-06-01 2008-12-03 Linde Aktiengesellschaft Procédé de transformation commandé de coke en cubilots
CN101428342B (zh) * 2008-12-18 2013-02-13 高尔荣 一种炼铁铸造系统

Also Published As

Publication number Publication date
DE59203547D1 (de) 1995-10-12
EP0521523B1 (fr) 1995-09-06
ATE127580T1 (de) 1995-09-15
ES2079744T3 (es) 1996-01-16
DE4122381A1 (de) 1993-01-07

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