EP0587518A1 - Porte de décrassage d'un four électrique à arc - Google Patents

Porte de décrassage d'un four électrique à arc Download PDF

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Publication number
EP0587518A1
EP0587518A1 EP93470019A EP93470019A EP0587518A1 EP 0587518 A1 EP0587518 A1 EP 0587518A1 EP 93470019 A EP93470019 A EP 93470019A EP 93470019 A EP93470019 A EP 93470019A EP 0587518 A1 EP0587518 A1 EP 0587518A1
Authority
EP
European Patent Office
Prior art keywords
tube
air
door
orifices
door according
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.)
Withdrawn
Application number
EP93470019A
Other languages
German (de)
English (en)
French (fr)
Inventor
Thierry Bernet
Jacques Blum
Jacques Le Goff
Daniel Pernet
Dominique Rocchi
Claude Suger
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.)
Unimetal SA
Original Assignee
Unimetal SA
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 Unimetal SA filed Critical Unimetal SA
Publication of EP0587518A1 publication Critical patent/EP0587518A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • F27D99/0075—Gas curtain seals
    • 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/24—Cooling arrangements
    • 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
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1858—Doors
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1545—Equipment for removing or retaining slag
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1545—Equipment for removing or retaining slag
    • F27D3/1554—Equipment for removing or retaining slag for removing the slag from the surface of the melt
    • 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
    • F27D2009/0018—Cooling of furnaces the cooling medium passing through a pattern of tubes
    • F27D2009/0021—Cooling of furnaces the cooling medium passing through a pattern of tubes with the parallel tube parts close to each other, e.g. a serpentine
    • F27D2009/0024—Cooling of furnaces the cooling medium passing through a pattern of tubes with the parallel tube parts close to each other, e.g. a serpentine with contiguous tubes, which may be separately welded one to the other

Definitions

  • the present invention relates to a scouring door of an electric arc furnace, for example a scrap melting furnace, in a metallurgical installation.
  • the slag is deposited on the threshold of this door, and remains attached to it.
  • the object of the present invention is to propose a scouring door arranged so as to avoid these drawbacks.
  • the present invention therefore relates to a scouring door of an electric arc furnace, of the type comprising a panel, in particular cooled and mounted sliding vertically in front of a scouring opening of said oven, characterized in that it comprises means for forming an air curtain directed towards the threshold of the door and extending substantially over the entire width of this door to seal the bottom of said door during its closing and partial opening, said air curtain forming means comprising an air tube connected to means for supplying compressed air and at least a horizontal cooling tube provided at the bottom of the door, said air tube having orifices oriented towards the threshold of said door.
  • the electric arc furnace the outer wall 1 of which is shown diagrammatically in FIG. 1, is fitted with a door 10 slidably mounted vertically in front of a scouring opening 2 of the furnace.
  • the door 10 slides in vertical guides 3, fixed to the external wall 1 of the oven on either side of its opening 2.
  • the sliding of the door 10 is controlled by an operating member (not shown), constituted for example by an actuator of the double-acting type, which makes it possible to partially open the door 10 for the introduction by the inlet 2 of injection lances. or metal bath sampling probes.
  • the door 10 is formed by a panel 11 generally comprising a bundle of cooling tubes 12 (FIG. 2) in which a fluid, for example water, circulates.
  • a fluid for example water
  • the tubes 12 are horizontal and parallel and extend substantially over the entire width of said door.
  • the door 10 is provided with means 20 for forming an air curtain directed towards the threshold 4 of the door 10 and extending substantially over the entire width of this door to seal the bottom of said door during its closing and its partial opening.
  • the air curtain has an effective height of up to 50 cm.
  • the means 20 for forming the air curtain comprise a box constituting an air tube 21 of generally substantially parallelepipedal shape and fixed to the lower part of the door 10.
  • the air tube 21 is connected to compressed air supply means, not shown, and has on its wall arranged opposite the threshold 4 of the door 10, orifices 22 oriented towards said threshold 4.
  • the air tube 21 is protected by a refractory material.
  • a plate 24 of refractory material can be fixed to the air tube 21, on the inside of the oven, to protect the tube from the thermal radiation of the oven.
  • the air tube 21 can be fixed directly to the lower part of the panel 11 or to the cooling tube 12 located at the lower part of the bundle in the case where the door 10 is provided with such a bundle.
  • the air tube 21 is disposed in an enclosure constituting a cooling tube 23 also of generally substantially parallelepipedal shape in which a cooling fluid circulates.
  • the wall of the air tube 21 comprising the orifices 22 forms the bottom of said cooling tube 23.
  • the cooling tube 23 can be fixed directly to the lower part of the panel 11 or to the tube 12 located at the lower part of the bundle.
  • the orifices 22 are formed by at least one row of slots 22a, the end slots 22b of which are in the shape of an "L" (FIG. 4), one wing of which is directed towards the wall of the oven, making it possible to create a curtain of air ensuring better lateral tightness.
  • the means 20 for forming the air curtain comprise an air tube 30 connected to compressed air supply means, not shown, and integrated in a horizontal cooling tube 13 provided at the bottom of the door 10.
  • This cooling tube can be constituted by an independent tube fixed to the lower part of the door 10 which facilitates the assembly or disassembly of the assembly, or by the portion of the bundle of cooling tubes 12 located at the bottom of the bundle, as shown in Figs. 5 to 8.
  • the air tube 30 is coaxial with the cooling tube 13 and has orifices 31 oriented towards the threshold 4 of the door 10.
  • These orifices 31 communicate with the outside of the cooling tube 13 by a longitudinal groove 32 formed in the bottom of this cooling tube 13 and provided with sealing means between said air tube 30 and said cooling tube 12.
  • These sealing means are formed by two deflectors 33 each disposed on either side of the openings 31 and connecting the air tube 30 with the longitudinal edges of the groove 32.
  • the height and the spacing of the deflectors 33 are determined so as to channel the air jets coming from the orifices 31 for a homogeneous air curtain.
  • This tube 30 can also be supplied with compressed air by its two ends to improve the homogeneity of the air curtain.
  • the air tube 30 is supported on the longitudinal edges of the groove 32 and the generatrix of the exterior surface of this air tube 30 having orifices 31 is tangent to the exterior surface of the cooling tube 13 .
  • the sealing means are formed by two longitudinal weld seams 34 disposed between the outer surface of the air tube 30 and the edges of the groove 32.
  • this box 41 is placed against the door, on the outside and has an additional cooling tube 44 and air outlet orifices 42 are formed between the lower tube 43 of the tube bundle 12 and the additional tube 44 arranged parallel to the lower tube and substantially even height.
  • the box 41 is formed by a horizontal wall 45 welded to the bundle of tubes 12 and a substantially vertical wall 46 welded to the additional tube 44.
  • the box 41 is formed by a sheet 47 folded in a "U" whose wings are directed downwards.
  • One wing 48 of the "U” is welded by its lower edge to the additional tube 44, and the other wing 49 extends downward to the height of the additional tube 44 to define therewith the outlet orifices 42 d 'air.
  • the box is removably attached to the door on the outside.
  • the additional tube 44 can be connected directly to the bundle of tubes 12, or be supplied with water separately. These two embodiments have the advantage of being able to be adapted to existing doors without significant modification thereof. In addition, the device is protected from thermal radiation from the oven by the door itself.
  • the box can be easily disassembled for possible reconditioning.
  • the air tube 21, 30 or 41 can be connected, by one of its ends or by its two ends to the compressed air supply means.
  • the distribution of the air flows over the tube length is not homogeneous and the air flow is greater at the end of the tube opposite to that connected to the air supply means.
  • the air flow leaving through the orifices is greater in the middle of the tube than at its two ends.
  • the air tube 21 has inside baffles 50 which break the air jet by creating an overpressure in the area close to the air supply.
  • baffles 50 can be placed inside the tube 21 depending on the width of the oven door and the homogeneity of the air curtain desired.
  • a baffle 50 is placed 150mm from the end of the tube 21 connected to the air supply or from the two ends of the tube 21 when the two ends of said tube are connected to a supply of air, as shown in Fig. 11.
  • the air outlet orifices can be made in the form of discontinuous slots, which makes it possible to prevent these slots from spreading by deformation of the air tube under the effect of heat. Indeed, a constant width of the slots makes it possible to obtain a regular air flow so that the air curtain remains homogeneous.
  • the air curtain thus formed at the base of the door makes it possible to create a seal, even when said door cannot be lowered to the threshold or when the door is intentionally partially opened to introduce lances into the oven. injection or sampling probes, or even during scrubbing.
  • a device according to the present invention has been tested by producing the orifices in the form of a slot of 1 mm wide extending discontinuously over a length of 800 mm corresponding to the width of the scouring opening. .
  • an air flow of 300 N.m3 / h, and a supply pressure of 1.1 bars an effective air curtain was obtained over a height of 300 mm, the oven enclosure being under vacuum about -30 Pa. and the air speed at the outlet of the orifices being at least 50 m / s.
  • the air ejection speed at the outlet of the orifices is greater than 50 m / s so that the air curtain is effective over a height of 300mm when the oven door is ajar.
  • the air supply rate is adjusted according to the operating phase of the oven.
  • the air supply rate is 100m3 / h when the oven door is closed.
  • This flow rate is 300 m3 / h when the oven door is open by 200 mm to allow the passage of the oxygen injection lance or for the addition, for example, of coal during the melting of the charge and when the door is open 300mm above the slag during refining or descaling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Furnace Details (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
EP93470019A 1992-09-11 1993-08-19 Porte de décrassage d'un four électrique à arc Withdrawn EP0587518A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9210867 1992-09-11
FR9210867A FR2695715B1 (fr) 1992-09-11 1992-09-11 Porte de décrassage d'un four électrique à arc.

Publications (1)

Publication Number Publication Date
EP0587518A1 true EP0587518A1 (fr) 1994-03-16

Family

ID=9433426

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93470019A Withdrawn EP0587518A1 (fr) 1992-09-11 1993-08-19 Porte de décrassage d'un four électrique à arc

Country Status (6)

Country Link
EP (1) EP0587518A1 (sk)
JP (1) JPH06235590A (sk)
CN (1) CN1084631A (sk)
CZ (1) CZ186593A3 (sk)
FR (1) FR2695715B1 (sk)
SK (1) SK96793A3 (sk)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1158258A2 (de) * 2000-05-20 2001-11-28 SMS Demag AG Verfahren und Einrichtung zum Rückgewinnen der Abgas-Energie aus einen metallurgischen Prozess in einem Schmelzgefäss
EP2044377A1 (en) * 2006-06-20 2009-04-08 Empco (Canada) Ltd. Sealing apparatus for a slag door of a metallurgical furnace
CN100557359C (zh) * 2006-09-26 2009-11-04 山西太钢不锈钢股份有限公司 一种辊底炉炉门及其炉门坎
EP2482018A4 (en) * 2009-12-29 2015-11-11 Hyundai Steel Co DOOR DEVICE FOR DISPENSING SLAG FOR AN ELECTRIC OVEN
EP2647937A4 (en) * 2010-11-29 2018-01-10 Hyundai Steel Company Slag discharge door device for an electric furnace
CN109307075A (zh) * 2018-11-07 2019-02-05 重庆长安工业(集团)有限责任公司 气密封保护装置

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008052800A1 (de) * 2008-10-15 2010-04-22 Sms Siemag Aktiengesellschaft Schlackentür für metallurgische Öfen
US8206642B2 (en) * 2010-03-16 2012-06-26 Process Technology International Pivoting slag door
KR101225260B1 (ko) * 2010-12-29 2013-01-22 현대제철 주식회사 전기로의 슬래그 배출 도어 구조체
KR101225325B1 (ko) * 2010-11-29 2013-01-23 현대제철 주식회사 전기로의 슬래그 배출 도어 장치
CN102120211A (zh) * 2010-12-21 2011-07-13 苏州博恒浩科技有限公司 彩涂板固化炉气帘密封装置
ES2643468T3 (es) * 2011-02-16 2017-11-23 Sms Group S.P.A. Puerta de escoria de horno y horno correspondiente
KR101277817B1 (ko) * 2011-09-30 2013-06-21 주식회사 서울엔지니어링 슬래그 배출 도어 제조 방법
CN108225036B (zh) * 2018-01-23 2024-02-27 中钢集团鞍山热能研究院有限公司 一种加热炉炉口气封装置及气封方法
IT201800002758A1 (it) * 2018-02-16 2019-08-16 Miwenti S R L Dispositivo davanzale raffreddato per porta da scoria di un forno metallurgico

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2534747A (en) * 1946-06-12 1950-12-19 Republic Steel Corp Open-hearth door construction
FR1457907A (fr) * 1964-12-07 1966-11-04 Appareil de chauffage et de déchargement de matières en fusion dans les fours rotatifs
LU53321A1 (sk) * 1966-04-07 1967-05-30
US3575398A (en) * 1968-11-13 1971-04-20 Midland Ross Corp Apparatus for minimizing atmosphere upset in a furnace for heat treating articles
DE3208490A1 (de) * 1981-03-10 1982-11-25 Nippon Steel Corp., Tokyo Druckluft-schlackenabsperreinrichtung fuer einen stahlkonverter
US4449922A (en) * 1982-08-30 1984-05-22 Bloom Engineering Company, Inc. Reheat furnace drop out door seal
DE3842203A1 (de) * 1988-12-15 1990-06-21 Mannesmann Ag Schmelzofen, insbesondere lichtbogenofen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2534747A (en) * 1946-06-12 1950-12-19 Republic Steel Corp Open-hearth door construction
FR1457907A (fr) * 1964-12-07 1966-11-04 Appareil de chauffage et de déchargement de matières en fusion dans les fours rotatifs
LU53321A1 (sk) * 1966-04-07 1967-05-30
US3575398A (en) * 1968-11-13 1971-04-20 Midland Ross Corp Apparatus for minimizing atmosphere upset in a furnace for heat treating articles
DE3208490A1 (de) * 1981-03-10 1982-11-25 Nippon Steel Corp., Tokyo Druckluft-schlackenabsperreinrichtung fuer einen stahlkonverter
US4449922A (en) * 1982-08-30 1984-05-22 Bloom Engineering Company, Inc. Reheat furnace drop out door seal
DE3842203A1 (de) * 1988-12-15 1990-06-21 Mannesmann Ag Schmelzofen, insbesondere lichtbogenofen

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1158258A2 (de) * 2000-05-20 2001-11-28 SMS Demag AG Verfahren und Einrichtung zum Rückgewinnen der Abgas-Energie aus einen metallurgischen Prozess in einem Schmelzgefäss
EP1158258A3 (de) * 2000-05-20 2002-09-04 SMS Demag AG Verfahren und Einrichtung zum Rückgewinnen der Abgas-Energie aus einen metallurgischen Prozess in einem Schmelzgefäss
EP2044377A1 (en) * 2006-06-20 2009-04-08 Empco (Canada) Ltd. Sealing apparatus for a slag door of a metallurgical furnace
EP2044377A4 (en) * 2006-06-20 2010-10-27 Empco Canada Ltd SEALING DEVICE FOR METALLURGICAL OVEN DECOUPLING DOOR
US8124004B2 (en) 2006-06-20 2012-02-28 Empco (Canada) Ltd. Slag door assembly for an electric arc furnance
CN100557359C (zh) * 2006-09-26 2009-11-04 山西太钢不锈钢股份有限公司 一种辊底炉炉门及其炉门坎
EP2482018A4 (en) * 2009-12-29 2015-11-11 Hyundai Steel Co DOOR DEVICE FOR DISPENSING SLAG FOR AN ELECTRIC OVEN
EP2647937A4 (en) * 2010-11-29 2018-01-10 Hyundai Steel Company Slag discharge door device for an electric furnace
CN109307075A (zh) * 2018-11-07 2019-02-05 重庆长安工业(集团)有限责任公司 气密封保护装置

Also Published As

Publication number Publication date
FR2695715B1 (fr) 1994-11-25
FR2695715A1 (fr) 1994-03-18
CN1084631A (zh) 1994-03-30
CZ186593A3 (en) 1995-07-12
SK96793A3 (en) 1994-05-11
JPH06235590A (ja) 1994-08-23

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