EP0052039B1 - Kühlkasten für Hochöfen - Google Patents

Kühlkasten für Hochöfen Download PDF

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Publication number
EP0052039B1
EP0052039B1 EP81401681A EP81401681A EP0052039B1 EP 0052039 B1 EP0052039 B1 EP 0052039B1 EP 81401681 A EP81401681 A EP 81401681A EP 81401681 A EP81401681 A EP 81401681A EP 0052039 B1 EP0052039 B1 EP 0052039B1
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EP
European Patent Office
Prior art keywords
cast iron
cooling
plate according
tubes
cooling plate
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
Application number
EP81401681A
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English (en)
French (fr)
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EP0052039A1 (de
Inventor
Jean Cordier
Pierre Rollot
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USINOR SA
Original Assignee
Union Siderurgique du Nord et de lEst de France SA USINOR
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Application filed by Union Siderurgique du Nord et de lEst de France SA USINOR filed Critical Union Siderurgique du Nord et de lEst de France SA USINOR
Priority to AT81401681T priority Critical patent/ATE11570T1/de
Publication of EP0052039A1 publication Critical patent/EP0052039A1/de
Application granted granted Critical
Publication of EP0052039B1 publication Critical patent/EP0052039B1/de
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/10—Cooling; Devices therefor

Definitions

  • the present invention relates to cooling plates for blast furnaces.
  • These cooling plates are elements placed against the internal face of the shielding and fulfill the dual function of vigorous cooling of the refractory and of screen as the heat flow passes through the shielding.
  • the cooling plates are made up of cast iron elements traversed in their mass by a network of tubes in which circulates a cooling fluid which is generally water. These cooling tubes open at the top and bottom parts respectively of the cooling plates and pass through the shield, outside of which they are connected to cooling tubes of an adjacent upper or lower plate.
  • the tubes thus connected determine the circulation lines of the fluid rising in a substantially vertical plane along the wall of the blast furnace, these lines being connected to an external circuit for circulation and cooling of the fluid.
  • the cooling plates should be designed so that they withstand the deformations thermomécani q high flow resulting ues generated in the blast furnace and, further, to ensure good heat exchange with the refractory and ensure hooking effective of the latter.
  • the present invention therefore aims to remedy these drawbacks by providing cooling plates having increased operating safety, and better resistance to cracking while having better heat exchange and attachment characteristics of the refractory lining.
  • the present invention thus relates to a cooling plate consisting of an element of substantially parallelepiped shape, in which are embedded longitudinal tubes arranged parallel to each other, these tubes opening onto the same main face of the element, respectively to upper and lower parts of the cooling plate, characterized in that the face opposite the main face is embossed and has longitudinal and transverse grooves which intersect at right angles, and in that the element is made of cast iron.
  • the transverse grooves of the embossed face include silicon carbide inserts.
  • the cooling plate 1 arranged vertically, is placed between the shield 2 of the blast furnace and the refractory lining 3.
  • the cooling plate 1 is pressed against the internal wall of the shield by bosses 4 projecting from the main face 5 planes opposite the shielding.
  • the cooling plate is traversed by longitudinal tubes 6 for circulation of the cooling fluid arranged parallel to each other and extending along a longitudinal axis disposed vertically.
  • the tubes 6 open from the plate 1 to the upper and lower parts, respectively, in furnaces 7 and 8 which are embedded in the mass of cast iron of the cooling plate.
  • the part of the cooling tubes leaving the plates and their sheaths are arranged in such a way that they are strictly horizontal, that is to say that they are slightly inclined relative to the perpendicular to the surface of the shield at the point of crossing of the latter.
  • the face 9 of the cooling plate opposite to the face 5, which is the face on which the cooling tubes open, has an embossed shape.
  • This embossed shape is obtained by the intersection at right angles to longitudinal 10 and transverse grooves 11, the longitudinal grooves 10 being parallel to the tubes 6.
  • the grooves can have a square, rectangular or trapezoidal cross section.
  • the longitudinal grooves 10 have a trapezoidal section whose flared portion is directed towards the outside of the plate, while the transverse grooves 11 have a trapezoidal section arranged in dovetail.
  • inserts 12 of corresponding trapezoidal section which project from the embossed face 9 of the cooling plate.
  • inserts are made of silicon carbide and placed in situ during the casting of the cast iron from the cooling plate. This characteristic of casting the cast iron around the bricks of special silicon carbide, allows an intimate contact, ensured by a chemical bond, between the silicon carbide and the cast iron, which guarantees an excellent coefficient of heat transfer between the two materials.
  • transverse grooves On the cooling plate shown in Figure 1, all the transverse grooves have inserts in silicon carbide, but it is possible to space these inserts every two or three grooves and even to have none.
  • the transverse grooves without an insert can have a trapezoidal cross section whose flared part is directed towards the outside of the plate.
  • the embossing of the face 9 opposite the refractory lining makes it possible, first of all, to increase the interface between the refractory lining and the cast iron and, therefore, to promote heat exchange. It also performs a mechanical anchoring function of the refractory inside the blast furnace.
  • the silicon carbide inserts play a role in improving the bond between the cast iron and the refractory lining. Furthermore, in the case of a disappearance of the refractory lining during the operation of the blast furnace, these elements promote self-filling and provide abrasion resistance.
  • FIG. 2 In Figure 2 is shown in section a cooling plate of the curb type.
  • the cooling plate as in the general case of FIG. 1, is disposed against the internal face of the shield 2.
  • Longitudinal cooling tubes 6 are embedded in the mass of cast iron of the cooling plate and exit at the top and bottom parts in protective sleeves 7 and 8 which pass through the shield 2.
  • packing masses intended to ensure a solution of continuity of the refractory lining system , cooling plate and shield are arranged between side 5 of the cooling plate and the shield. The cooling plate is held in close contact against the shielding by means external to the latter, not shown.
  • a coping 13 projecting from the embossed face 9 of the cooling plate comprises, embedded in its mass, a transverse tube 14 for circulation of the cooling fluid, which opens on the face 5 opposite the shielding, through protective sleeves 15 , embedded in the metallic mass of the cooling plate and passing through the shield 2.
  • transverse tube is arranged such that it passes between the longitudinal tubes 6 for circulation of the cooling fluid.
  • the transverse tubes 14 are connected outside the blast furnace to other similar tubes cooling copings of other upper or lower cooling plates.
  • the circuit of the transverse cooling tubes is likewise connected to an external circuit for circulation and cooling of the fluid.
  • the coping may include a cooling tube, as shown in Figures 2 and 3, but one can also have several, depending on the size of the coping.
  • This coping can be arranged at a part slightly lower at the upper edge of the cooling plate, or at a more median part, or constitute the upper edge of the cooling plate.
  • the copings are arranged at a lower part at the upper edge of the cooling surface or more median, whereas for the last row located in the tank area, the coping forms the upper edge of the cooling plates.
  • the coping may also include CSi inserts in at least one groove made for this purpose, the inserts protruding from the grooves.
  • the copings 13 have an upper face 16 substantially perpendicular to the embossed face 9 so that it is substantially horizontal when the cooling plate is positioned in the blast furnace.
  • the cooling plates include a number of longitudinal cooling tubes 6 which can vary from 3 to 5.
  • the density of the internal cooling tubes is varied as a function of the heat fluxes emitted in the blast furnace and it is obvious that the more this heat flow is intense, the more the distance between the tubes must be reduced.
  • the cooling plates at the level of the belly there are tubes at a center distance of 195 to 210 mm, while in the less stressed areas of the tank, this center distance is increased to 270-320 mm.
  • the dimensions of the plates are also a function of the heat flux emitted in the various zones of the blast furnace. So in the areas of intense thermal stress, where the density of the internal tubes is high, that is to say their center distance is small, there are cooling plates of smaller dimensions comprising the same number of tubes as in the zones stressed by a less heat flow intense.
  • the cooling plates are made of cast iron which must have, in addition to the qualities inherent in this material, characteristics specific to its particular use.
  • Fonts of types (a) and (b) present the following analysis in percentage by weight.
  • Fonts of types (a) and (b) differ only in their crystallographic structure.
  • Cast iron of type (b) is of controlled lamellar graphite of rounded type A predominant, stabilized and of high conductivity. This particular crystallographic structure is obtained by a selected oven, a control of overheating and by inoculation.
  • Cast iron of type (c) with aluminum presents the following analysis as a percentage by weight:
  • Inoculation agent based on Cr alloy expressed in Cr: 0.3 to 2%.
  • This aluminum cast iron does not quench, it retains at high temperature its conductivity and its mechanical resistance to abrasion and cracking.
  • Type C cast iron is used in the most stressed places of the blast furnace, by heat fluxes, and by mechanical abrasion effects, in particular for the cooling plates of the bottom of the tank, with curbs, and of the belly.
  • the cast iron has the following composition in percentage by weight:

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Blast Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Claims (7)

1. Kühlplatte, insbesondere für Hochöfen, welche durch ein Element im wesentlichen parallelepipedischer Form gebildet ist, in welchem parallel zueinander angeordnete Längsrohre (6) versenkt sind, wobei diese Rohre auf der gleichen Hauptfläche (5) des Elements im oberen bzw. im unteren Teil der Kühlplatte austreten, dadurch gekennzeichnet, daß die der Hauptfläche (5) abgekehrte Fläche (9) waffelförmig gerippt ist und Längsrinnen (10) und Querrinnen (11) aufweist, die einander unter einem rechten Winkel schneiden, und daß das Element aus Gußeisen ist.
2. Platte nach Anspruch 1, dadurch gekennzeichnet, daß wenigstens eine Querrinne (11) Einsätze (12) aus Siliziumcarbid aufweist, die über die waffelförmig gerippte Fläche (9) vorspringen.
3. Platte nach irgendeinem der Ansprüche 1 und 2, welche auf der waffelförmig gerippten Fläche (9) einen Kranz genannten vorspringenden Teil (13) aufweist, dadurch gekennzeichnet, daß der Kranz (13) wenigstens eine Rinne aufweist, in welcher über die Rinnen vorspringende Einsätze aus Siliziumcarbid aufgenommen sind.
4. Platte nach irgendeinem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß sie aus Gußeisen hoher Wärmeleitfähigkeit mit folgender Zusammensetzung in Gewichtsprozent hergestellt ist :
Figure imgb0009
Figure imgb0010
5. Platte nach Anspruch 4, dadurch gekennzeichnet, daß die kirstallographische Struktur des Gußeisens kontrollierter lamellenförmiger Graphit des Typs A vorherrschend abgerundet ist.
6. Platte nach irgendeinem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß sie aus einem nicht-härtenden Aluminiumgußeisen hoher thermischer Leitfähigkeit mit folgender Zusammensetzung in Gewichtsprozent hergestellt ist :
Figure imgb0011
Figure imgb0012
Impfmittel auf Cr-Legierungsbasis, ausgedrückt in Cr: 0,3 bis 2%.
7. Platte nach Anspruch 6, dadurch gekennzeichnet, daß das Gußeisen mit einer Legierung auf Kupfer- und Seltenerdbasis, bei welcher 50 % der seltenen Erden durch Ce gebildet sind, anstelle der entsprechenden Menge an Cr-Legierung geimpft ist.
EP81401681A 1980-11-07 1981-10-23 Kühlkasten für Hochöfen Expired EP0052039B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81401681T ATE11570T1 (de) 1980-11-07 1981-10-23 Kuehlkasten fuer hochoefen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8023805A FR2493871A1 (fr) 1980-11-07 1980-11-07 Plaques de refroidissement pour hauts fourneaux
FR8023805 1980-11-07

Publications (2)

Publication Number Publication Date
EP0052039A1 EP0052039A1 (de) 1982-05-19
EP0052039B1 true EP0052039B1 (de) 1985-01-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP81401681A Expired EP0052039B1 (de) 1980-11-07 1981-10-23 Kühlkasten für Hochöfen

Country Status (7)

Country Link
US (1) US4437651A (de)
EP (1) EP0052039B1 (de)
JP (1) JPS57110606A (de)
AT (1) ATE11570T1 (de)
CA (1) CA1154590A (de)
DE (1) DE3168672D1 (de)
FR (1) FR2493871A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19503912A1 (de) * 1995-02-07 1996-08-08 Gutehoffnungshuette Man Kühlplatte für Schachtöfen
DE10249333A1 (de) * 2002-10-22 2004-05-19 Refractory Intellectual Property Gmbh & Co.Kg Metallurgisches Schmelzgefäß
WO2005075688A1 (en) * 2004-02-04 2005-08-18 Technological Resources Pty Limited Metallurgical vessel

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3323781C2 (de) * 1983-07-01 1986-04-03 Uhde Gmbh, 4600 Dortmund Einrichtung zur Kühlung dickwandiger, waagerecht angeordneter Rohrböden von Wärmetauschern
FR2552105B1 (fr) * 1983-09-21 1988-10-28 Usinor Perfectionnement aux plaques de refroidissement pour hauts-fourneaux
JPH0193841U (de) * 1987-12-15 1989-06-20
DE3925280A1 (de) * 1989-07-31 1991-02-07 Gutehoffnungshuette Man Fluessigkeitsdurchstroemtes kuehlelement fuer schachtoefen
DE4238369C2 (de) * 1992-11-13 1996-09-26 Mtu Muenchen Gmbh Bauteil aus einem metallischen Grundsubstrat mit keramischer Beschichtung
US5464592A (en) * 1993-11-22 1995-11-07 Texaco Inc. Gasifier throat
EP1069389A4 (de) * 1999-02-03 2001-04-25 Nippon Steel Corp Wasserkühlungspanel für ofenwand und ofenabdeckung eines lichtbogenofens
NL1011838C2 (nl) * 1999-04-20 2000-10-23 Hoogovens Technical Services B Koelpaneel voor een schachtoven, schachtoven voorzien van dergelijke koelpanelen en een werkwijze voor de vervaardiging van zo'n koelpaneel.
DE19937291A1 (de) * 1999-08-06 2001-02-15 Km Europa Metal Ag Kühlelement
US6676597B2 (en) * 2001-01-13 2004-01-13 Medtronic, Inc. Method and device for organ positioning
KR100815808B1 (ko) * 2001-12-26 2008-03-20 주식회사 포스코 용광로의 이중구조 스테이브 냉각장치
CN100343395C (zh) * 2002-03-12 2007-10-17 Km欧洲钢铁股份有限公司 冷却元件
FI115251B (fi) * 2002-07-31 2005-03-31 Outokumpu Oy Jäähdytyselementti
EP1391521A1 (de) 2002-08-20 2004-02-25 Voest-Alpine Industrieanlagenbau GmbH & Co. Kühlplatte für metallurgische Öfen
US6870873B2 (en) * 2003-05-28 2005-03-22 Systems Spray-Cooled, Inc. Device for improved slag retention in water cooled furnace elements
FI116317B (fi) * 2003-06-12 2005-10-31 Outokumpu Oy Jäähdytyselementti ja menetelmä jäähdytyselementin valmistamiseksi
AU2005210677B2 (en) * 2004-02-04 2009-12-10 Tata Steel Limited Metallurgical vessel
US7832367B2 (en) * 2007-12-05 2010-11-16 Berry Metal Company Furnace panel leak detection system
LU91454B1 (en) 2008-06-06 2009-12-07 Wurth Paul Sa Cooling plate for a metallurgical furnace
LU91551B1 (en) * 2009-04-14 2010-10-15 Wurth Paul Sa Cooling plate for a metallurgical furnace
KR101337108B1 (ko) * 2010-02-23 2013-12-05 신닛테츠스미킨 카부시키카이샤 스테이브 및 고로
AU2011235208A1 (en) * 2010-03-30 2012-10-25 Berry Metal Company Apparatus and method for gas tight secondary stave support
US8834784B2 (en) * 2011-01-27 2014-09-16 Allan J. MacRae Thin stave cooler and support frame system
LU91788B1 (en) * 2011-02-08 2012-08-09 Wurth Paul Sa Stave cooler for a metallurgical furnace
AU2017220495B2 (en) * 2016-02-18 2019-11-14 Hatch Ltd. Wear resistant composite material, its application in cooling elements for a metallurgical furnace, and method of manufacturing same
DE102016107284A1 (de) * 2016-04-20 2017-10-26 Kme Germany Gmbh & Co. Kg Kühlplatte für ein Kühlelement für metallurgische Öfen
EP3562963B1 (de) * 2016-12-30 2021-11-17 Arcelormittal Kupferkühlplatte mit verschleissbeständigen einsätzen für einen hochofen
CN110088304B (zh) * 2016-12-30 2024-04-30 安赛乐米塔尔公司 用于高炉的具有包含耐磨材料的多层突出部的铜冷却板
RU2682499C1 (ru) * 2017-09-21 2019-03-19 Общество с ограниченной ответственностью "Севен Рефракториз" Способ футеровки шахты доменной печи, холодильный блок шахты доменной печи и способ его изготовления

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1508059C3 (de) * 1966-07-08 1975-03-06 Ewald W. Dr.-Ing. Rohde Hochofen-Kühlkasten
DE1533864C3 (de) * 1967-03-08 1975-08-07 Ewald W. Dr.-Ing. Rohde Hochofenkühlkasten
GB1439137A (en) * 1972-10-19 1976-06-09 Didier Werke Ag Cooling element for furnace linings
SU439178A1 (ru) * 1973-05-25 1977-11-25 Всесоюзный Научно-Исследовательский И Проектный Институт По Очистке Технологических Газов, Сточных Вод И Использованию Вторичных Энергоресурсов Предприятий Черной Металлургии Холодильник доменной печи
FR2257068A1 (en) * 1974-01-03 1975-08-01 Hoogovens Ijmuiden Bv Cooling panels for blast furnaces - providing cooling for internal refractory lining support ribs
JPS557827Y2 (de) * 1974-01-23 1980-02-21
JPS5362708A (en) * 1976-11-17 1978-06-05 Kyoei Steel Ltd Electric furnace for steel making
FR2371652A2 (fr) * 1976-11-23 1978-06-16 Sofresid Plaque de refroidissement pour parois de fours a cuve, notamment pour hauts-fourneaux
LU80606A1 (fr) * 1978-12-01 1980-07-21 Dupret E Sa Ets Elements de refroidissement metalliques pour fours industriels

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19503912A1 (de) * 1995-02-07 1996-08-08 Gutehoffnungshuette Man Kühlplatte für Schachtöfen
DE10249333A1 (de) * 2002-10-22 2004-05-19 Refractory Intellectual Property Gmbh & Co.Kg Metallurgisches Schmelzgefäß
DE10249333B4 (de) * 2002-10-22 2005-09-08 Refractory Intellectual Property Gmbh & Co. Kg Metallurgisches Schmelzgefäß
WO2005075688A1 (en) * 2004-02-04 2005-08-18 Technological Resources Pty Limited Metallurgical vessel

Also Published As

Publication number Publication date
ATE11570T1 (de) 1985-02-15
EP0052039A1 (de) 1982-05-19
JPS57110606A (en) 1982-07-09
JPS621441B2 (de) 1987-01-13
CA1154590A (en) 1983-10-04
FR2493871A1 (fr) 1982-05-14
US4437651A (en) 1984-03-20
FR2493871B1 (de) 1982-12-10
DE3168672D1 (en) 1985-03-14

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