EP0519553A1 - Méthode pour la réparation du revêtement réfractaire d'une paroi de four à cuve - Google Patents

Méthode pour la réparation du revêtement réfractaire d'une paroi de four à cuve Download PDF

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Publication number
EP0519553A1
EP0519553A1 EP92201689A EP92201689A EP0519553A1 EP 0519553 A1 EP0519553 A1 EP 0519553A1 EP 92201689 A EP92201689 A EP 92201689A EP 92201689 A EP92201689 A EP 92201689A EP 0519553 A1 EP0519553 A1 EP 0519553A1
Authority
EP
European Patent Office
Prior art keywords
refractory lining
panels
repair
layer
water
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
EP92201689A
Other languages
German (de)
English (en)
Other versions
EP0519553B1 (fr
Inventor
Jacobus Van Laar
Johan Egenolff Van Stein Callenfels
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.)
Tata Steel Ijmuiden BV
Original Assignee
Hoogovens Groep BV
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 Hoogovens Groep BV filed Critical Hoogovens Groep BV
Publication of EP0519553A1 publication Critical patent/EP0519553A1/fr
Application granted granted Critical
Publication of EP0519553B1 publication Critical patent/EP0519553B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4646—Cooling arrangements
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/10—Cooling; Devices therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • 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
    • F27B1/12—Shells or casings; Supports therefor
    • F27B1/14—Arrangements of linings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1621—Making linings by using shaped elements, e.g. bricks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D2001/1605—Repairing linings
    • F27D2001/1615—Repairing linings through a hole in the casing, e.g. injecting refractory from outside the vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/0002—Cooling of furnaces
    • F27D2009/001—Cooling of furnaces the cooling medium being a fluid other than a gas
    • F27D2009/0013—Cooling of furnaces the cooling medium being a fluid other than a gas the fluid being water
    • F27D2009/0016—Water-spray

Definitions

  • the invention is particularly but not exclusively applicable to the repair of the hearth wall of a blast furnace, and will be described below in this connection, but is applicable to other shaft furnaces of the type described above.
  • the thermal loading of the water-cooled cooling panels becomes too high, resulting in a high risk of a breakout in the hearth wall.
  • the lining can be affected as a result of various causes. Its thinning may be the result of prolonged operation, yet it may also be caused by water leaking from a cooling panel or from a water-cooled tuyere. Also, the above-mentioned causes may have already resulted in an actual breakout in the hearth wall. In all these cases repairs to the hearth wall are necessary.
  • a conventional repair method comprises the operations of complete cooling down of the blast furnace and subsequent removal of the charge from it. Next the hearth wall may be fully restored to its original condition, or a new structure may be selected for it.
  • Cooling down and emptying the blast furnace requires much time and a considerable loss of material. Then again it is frequently also necessary to repair other parts of the furnace structure which have been seriously affected by the cooling. During the whole period of cooling down, emptying, repairing, refilling and gradually blowing-in there is considerable loss in production time.
  • US-A-4465648 describes a method of repair of a blast furnace lining by cutting an opening through the steel shell and the refractory bricks, and inserting an injection nozzle for injecting repair material.
  • the nozzle carries reinforcing studs which are brought into radially projecting positions and become embedded in the injected repair material. This disclosure is not concerned specifically with the problem of wear of a blast furnace lining including water-cooled panels.
  • US-A-4017960 describes repair of a defective lining portion of a furnace or hot air duct, in which the outer shell and defective portion are cut out with a flame jet cutter, a replacement refractory lining block is inserted and welded in place with the same flame jet cutter, and the shell is repaired. This can be done while the lining is hot but is limited to materials which can be welded in this manner.
  • the object of the present invention is at least partly to overcome the disadvantage of known methods mentioned above.
  • the invention provides a method with which it has been found possible to repair the hearth structure described in such a way that the said losses in material, time and production may be substantially reduced.
  • the present invention consists in a method of repair of a defective portion of a refractory lining of a wall of a shaft furnace, which lining has water-cooled panels located at the inside of a steel furnace jacket and at least one inside layer of refractory lining material at the inside of the panels, characterised by the steps of removing at least one of said water-cooled panels at the location of the defective lining portion, replacing the removed panel or panels by a further refractory lining layer having a high thermal conductivity, and providing the steel furnace jacket at the repair region with art external water cooling system.
  • the said further refractory lining layer preferably has a thermal conductivity of at least 50 W/mK and is preferably of graphite blocks, which have e.g. a conductivity of 50-1000 W/mK.
  • the external water cooling system provided for the steel jacket may be a spray cooling system of a type in itself known.
  • a spray cooling system for example, sufficient water is sprayed at this hearth jacket close to its top end that a closed film or curtain of water flows along it downwards.
  • the method of the invention may easily be performed while the furnace is still hot from operation, even when safety requirements permit while still at the temperature of the molten metal, e.g. iron, in the furnace.
  • the molten metal e.g. iron
  • blast furnace is of the column-supported type and it has sufficient structural support from the tuyeres upwards, then removal of the entire hearth jacket may be considered when carrying out the new method.
  • Such a method is risky, however, certainly if the original lining is in poor condition all round.
  • a better and safer method consists in that, before the water-cooled panel or panel is removed, a portion of the steel furnace jacket corresponding in location to the water-cooled panel or panels to be removed is cut out, and after the removal of the panel or panels and the insertion of the further refractory lining layer, the cut-out portion of the furnace jacket is re-inserted or replaced.
  • the part of the jacket removed may correspond to for example 1, 2 or 4 cooling panels.
  • reinforcement members e.g. steel profiles adjacent the part to be cut out. Subsequently, following the repairs, these member may be removed. This ensures adequate support and stiffness of the structure during repairs, and the method is thus less sensitive to the type of structure of the furnace as a whole.
  • the method described is suitable for carrying out very local repairs on the furnace wall. However, it may also be used successfully in the event that a substantial part of the furnace wall or even the entire furnace wall has to be renewed. In that case the method described above may be repeated on successive parts of the wall in the circumferential direction of the furnace.
  • the method may be carried out with a substantial saving of time, if the method described above is commenced at several locations spaced equally around the circumference of the hearth.
  • Fig. 1 there are illustrated the concrete foundation 1 and the refractory bottom 2 of the hearth of a blast furnace.
  • the cooling system is not shown for the bottom since it is of no importance for understanding of the present invention.
  • the hearth structure is surrounded by a steel hearth jacket 3 which has an opening at the location of a tap hole 4.
  • the wall of the hearth to which the invention relates is formed by cooling panels 5 through which water flows inside the hearth jacket 3 and an inner refractory lining layer 6.
  • the structure of these cooling panels 5 is generally known, as is the way they are linked to a water system. For this reason details of it are not illustrated.
  • a conventional form of the refractory lining 6 takes the form of carbon blocks, and a tamped layer 9 is also applied between these carbon blocks and the cooling panels 5.
  • the gap between the cooling panels 5 and the hearth jacket 3 is likewise filled with a layer of filling mass 10.
  • the original profile of the lining is indicated by reference numeral 7, which profile may have become worn as a result of various causes, as shown by line 8, for example.
  • the hole is then closed again by inserting a new piece of hearth jacket 23.
  • an adjoining piece is cut out of the old hearth jacket, after reinforcement section 17 has first been removed and welded into a new position 25.
  • spraying mass is injected under pressure between the new piece of hearth jacket and the wall of graphite blocks 22. The operations described are now repeated at the location of the new hole. In this manner the entire hearth wall may be repaired stage by stage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Blast Furnaces (AREA)
EP19920201689 1991-06-19 1992-06-10 Méthode pour la réparation du revêtement réfractaire d'une paroi de four à cuve Expired - Lifetime EP0519553B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9101058A NL9101058A (nl) 1991-06-19 1991-06-19 Werkwijze voor de reparatie van de vuurvaste bekleding van de haardwand van een hoogoven.
NL9101058 1991-06-19

Publications (2)

Publication Number Publication Date
EP0519553A1 true EP0519553A1 (fr) 1992-12-23
EP0519553B1 EP0519553B1 (fr) 1995-05-17

Family

ID=19859388

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920201689 Expired - Lifetime EP0519553B1 (fr) 1991-06-19 1992-06-10 Méthode pour la réparation du revêtement réfractaire d'une paroi de four à cuve

Country Status (4)

Country Link
EP (1) EP0519553B1 (fr)
DE (1) DE69202523T2 (fr)
ES (1) ES2072084T3 (fr)
NL (1) NL9101058A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0603979A1 (fr) * 1992-12-23 1994-06-29 Ucar Carbon Technology Corporation Dispositif pour réduire les contraintes thermiques dans des éléments de four refroidis par de l'eau atomisée
US6870873B2 (en) 2003-05-28 2005-03-22 Systems Spray-Cooled, Inc. Device for improved slag retention in water cooled furnace elements
EP2882999A4 (fr) * 2012-08-09 2016-03-30 Graftech Int Holdings Inc Revêtement de bobine de haut fourneau

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894726A (en) * 1974-10-29 1975-07-15 United States Steel Corp Cascade water cooler aerator-multiplyer
US4017960A (en) * 1975-11-26 1977-04-19 Kureha Kagaku Kogyo Kabushiki Kaisha Method of repairing injured portion of refractory furnace-lining
US4465648A (en) * 1982-07-26 1984-08-14 Nippon Steel Corporation Method for repairing refractory wall of furnace
EP0118136A1 (fr) * 1983-01-27 1984-09-12 Telatek Oy Procédé pour réparer des éléments de refroidissement détériorés d'un haut fourneau
EP0319068A1 (fr) * 1987-12-02 1989-06-07 Hoogovens Groep B.V. Réparation du revêtement réfractaire de la paroi d'un four à cuve et four ainsi réparé

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894726A (en) * 1974-10-29 1975-07-15 United States Steel Corp Cascade water cooler aerator-multiplyer
US4017960A (en) * 1975-11-26 1977-04-19 Kureha Kagaku Kogyo Kabushiki Kaisha Method of repairing injured portion of refractory furnace-lining
US4465648A (en) * 1982-07-26 1984-08-14 Nippon Steel Corporation Method for repairing refractory wall of furnace
EP0118136A1 (fr) * 1983-01-27 1984-09-12 Telatek Oy Procédé pour réparer des éléments de refroidissement détériorés d'un haut fourneau
EP0319068A1 (fr) * 1987-12-02 1989-06-07 Hoogovens Groep B.V. Réparation du revêtement réfractaire de la paroi d'un four à cuve et four ainsi réparé

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 119 (C-282)(1842) 23 May 1985 & JP-A-60 009 810 ( SHIN NIPPON SEITETSU K.K ) 18 January 1985 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0603979A1 (fr) * 1992-12-23 1994-06-29 Ucar Carbon Technology Corporation Dispositif pour réduire les contraintes thermiques dans des éléments de four refroidis par de l'eau atomisée
US6870873B2 (en) 2003-05-28 2005-03-22 Systems Spray-Cooled, Inc. Device for improved slag retention in water cooled furnace elements
EP2882999A4 (fr) * 2012-08-09 2016-03-30 Graftech Int Holdings Inc Revêtement de bobine de haut fourneau

Also Published As

Publication number Publication date
DE69202523D1 (de) 1995-06-22
ES2072084T3 (es) 1995-07-01
EP0519553B1 (fr) 1995-05-17
DE69202523T2 (de) 1995-11-02
NL9101058A (nl) 1993-01-18

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