EP0017830A1 - Ofen zum Erwärmen von Brammen - Google Patents

Ofen zum Erwärmen von Brammen Download PDF

Info

Publication number
EP0017830A1
EP0017830A1 EP80101690A EP80101690A EP0017830A1 EP 0017830 A1 EP0017830 A1 EP 0017830A1 EP 80101690 A EP80101690 A EP 80101690A EP 80101690 A EP80101690 A EP 80101690A EP 0017830 A1 EP0017830 A1 EP 0017830A1
Authority
EP
European Patent Office
Prior art keywords
cooled
water
posts
skid
heating furnace
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
EP80101690A
Other languages
English (en)
French (fr)
Other versions
EP0017830B1 (de
Inventor
Tadashi Murakami
Toshikatsu Kishida
Kiyoshi Kobayashi
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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
Priority claimed from JP4181979U external-priority patent/JPS55142562U/ja
Priority claimed from JP3823279A external-priority patent/JPS55131119A/ja
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of EP0017830A1 publication Critical patent/EP0017830A1/de
Application granted granted Critical
Publication of EP0017830B1 publication Critical patent/EP0017830B1/de
Expired legal-status Critical Current

Links

Images

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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/22—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on rails, e.g. under the action of scrapers or pushers
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/201—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace walking beam furnace
    • 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
    • F27D3/02—Skids or tracks for heavy objects
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab

Definitions

  • the present invention relates to a heating furnace, particularly a furnace for heating a steel prior to the hot working of the steel.
  • the present invention relates,more particularly, to a walking beam type heating furnace and a pusher type heating furnace for heating the steel prior to the hot working of the steel, preferably an electromagnetic steel.
  • the steel material is alternately placed on a group of stationary skid beams and a group of movable skid beams.
  • the movable skid beams are moved in one cycle along the lifting, forward moving, lowering and returning paths, and thus forward the slabs in the walking beam type heating furnace.
  • the movable skid beams being lifted receive the slabs on the stationary skid beams.
  • the slabs are placed back on the stationary skid beams.
  • the movable skid beams and the stationary skid beams which are immovable, are constructed by welding water-cooled metallic skids on water-cooled metallic tubes which extend in the longitudinal direction of the furnace, and by lining the entire outer circumference of the water-cooled metallic tubes with a refractory material layer.
  • the water-cooled, metallic,skids are spaced from each other by a predetermined gap.
  • the water-cooled metallic tubes are supported by water-cooled posts, these posts being covered by a refractory material and protruding through the hearth of the walking beam type heating furnace.
  • the water-cooled posts which support the stationary skid beams, stand vertically on the hearth and are stationary with respect to the hearth, while the water-cooled posts, which support the movable skid beams, protrude through slots in the hearth and are connected to a driving device located below the hearth.
  • the hearth portions through which the posts supporting the movable beams protrude are provided with a bank formed or the hearth around each of these posts, so as to prevent the influx of molten slag or scale into the slots (c.f. Japanese Published Utility Model Applications Nos. 47-2739 and 49-15).
  • the charging and discharging of slabs are performed by pushing the slabs from the charging side to the discharging side of the pusher type heating furnace.
  • the heating zone of the furnace is provided with water cooled skid tubes to allow, the slabs to be conveyed and supported.
  • the slabs are pushed into contact with the refractory hearth, thereby allowing removal of so-called skid marks.
  • the structure of the water-cooled metallic tubes, water-cooled posts and metallic skids of pusher type heating furnaces is the same as in the walking beam type heating furnaces.
  • no gap is formed between the metallic skids in the pusher type heating furnace, because any gap acts as a resistance during the sliding movement of the steel sections, i.e. the steel slabs.
  • the number of the above mentioned water-cooled posts of the walking beam and the pusher type heating furnaces is desirably as small as possible for the following reasons:
  • the number of water-cooled posts is large, and further the heating temperature of the slabs is high, for example in the heating of electromagnetic steel, fuel consumption must be great enough to compensate for the heat withdrawal caused by the cooling water in the water-cooled posts.
  • the heat insulating function of all of the water-cooled posts is increased so as to avoid high fuel consumption, the installation cost becomes very great.
  • the number of water cooled posts should be as small as possible.
  • Each of the driven water-cooled posts of the walking beam type heating furnaces protrudes through the slot mentioned above,and a water-cooled sealing box is fitted below the slot so as to prevent
  • the known water-cooled posts of the walking beam and pusher type heating furnaces are tubes which directly support the skid tubes. If the water-cooled posts are reduced to a certain number, the supporting force of the water-cooled posts is decreased correspondingly to the reduced number. It was believed in the art of slab heating furnaces that the force required for supporting the skid beams is provided by a certain number of the water-cooled posts, which number could not be reduced.
  • the distance between a water-cooled post and an adjacent bank is small. This is because the number of the water-cooled posts is large J as explained above. Accumulation of molten slag or scale occurs at tne space between the water-cooled post and the banks, with the result that the molten slag or scale overflows the banks into the slots. Accordingly, the walking beam type heating furnaces provided' with the banks involve the problem of molten slag or scale acoumulation, which should be eliminated.
  • a heating furnace comprises skid tubes of water-cooled skid beams and water-cooled posts for supporting the water-cooled skid beams, wherein a post head having a trough-shaped receiving portion for a skid tube is stationarily located on each of the water-cooled posts at the upper portion thereof and has a length greater than the outer diameter of the water-cooled post provided with said post head.
  • the post head is provided with a trough-shaped receiving portion for a skid tube of a water-cooled skid beam and has length greater than the outer diameter of the water-cooled post.
  • the skid tubes of the water-cooled skid beams are metallic and cooling water flows through them.
  • the skid tubes and the water cooled posts constitute continuous beams having a number of fulcrums.
  • the cross section of the skid tubes is usually determined by the bending moment (M i ) at each fulcrum.
  • the present invention involves the concept of supplementing the force for supporting each of the skid tubes in the proximity of the fulcrums by means of the strength of each post head.
  • the number of posts can be reduced to one half or less the number of posts having an outer diameter (d) equal to the length (£).
  • the skid tubes and the water-cooled posts are provided with a covering of a refractory material resistant to the molten slag or scale at the outer circumference thereof.
  • the highly heat-conductive material may be compactly filled between the skid tubes and the trough-shaped receiving portions.
  • the highly heat-conductive material is used in the present invention for the following reasons: In order to exert the cooling effect of the skid tubes on the post heads, and hence to protect the post heads by cooling, the skid tubes and the post heads are desirably in contact with each other. The heat conduction between the so contacted skid tubes and post heads would be high if a metallic contact were realized between them. However, it is in practice difficult to achieve a completely metallic contact between the skid tubes and the post heads due to the working accuracy of these tubes and post heads.
  • Minute clearances are, therefore, locally formed between these tubes and post heads, and a heat-insulating layer is unavoidably formed due to gases in the clearances.
  • the highly heat-conductive material is placed in between.
  • the amount.of the highly heat-conductive material compactly filled between the skid tubes and the trough-shaped receiving portions maybe small. It is possible to effectively prevent a reduction of strength of the post heads because the cooling effect of the skid tubes satisfactorily extends to the post heads.
  • a bracket is rigidly secured to the lower side of each of the skid tubes and extends in the longitudinal direction of the skid tubes, and the post head is connected to the bracket by means of a pin.
  • the skid tubes can be readily exchanged by removing the pin from the bracket and the trough-shaped receiving portion and then withdrawing the skid tubes from the receiving portion.
  • the pin-securing portion of the post head is in the form of a thin neckand a heat-insulating refractory layer covered by the refractory covering at the outermost part of the water-cooled posts is formed on the neck portion.
  • the thin neck portion is liable to have such a structure that it is difficult to accomodate therein a water cooling system.
  • the structure of the neck portion is, therefore, not highly resistant to heat. Since the neck portion is thin, the thickness of the heat-insulating refractory layer is large. The thick and highly heat-insulating refractory layer can effectively protect the neck portion from a high-temperature heat in a heating furnace.
  • the water-cooled posts are arranged in a zigzag pattern as seen in a plan view.
  • a walking beam type heating furnace the water-cooled posts, the posts of the stationary skid beams and the posts of the movable skid beams, which are surrounded by banks for preventing the influx of molten slag or scale, are alternately arranged in a zigzag pattern.
  • no water-cooled posts are positioned between the banks of the walking beam type heating furnace, and the distance between a water-cooled post and an adjacent bank is large. Consequently, the flowability of the molten slag or scale is considerably increased over the flowability in conventional walking beam type heating furnaces.
  • the linear arrangement of the posts in conventional heating furnaces can also be adopted in the furnaces of the present invention.
  • the zigzag arrangement is used in the walking beam type heating furnace as described above,the advantage of a small number of posts as well as the advantage of considerable enhancemt of the flowability of the molten slag or scale on the hearth are achieved.
  • a walking beam type heating furnace 1 illustrated in a walking beam type heating furnace 1 illustrated .
  • the movable (driven) skid beams 2, 3, 4 and 5 and the stationary skid beams 6, 7, 8, 9 and 10 are arranged in parallel and alternately in the furnace 1, and run from a charging opening 11 to a discharging opening 12 of the furnace.
  • axial flow burners are located on the furnace roof above the beams 1 through 10.
  • Side burners 16 are located on the furnace side walls 13 and 14 below the beams 1 to 10 in such a manner that the axis 15 the of / flame is horizontal.
  • the side burners 16 are alternately positioned on the side wall 13 and the side wall 14.
  • the axial flow burners and side burners are arranged in each of a preheating zone Za, a heating zone Zb and a soaking zone ZC.
  • the hearth 18 is provided with extraction slots 21 for the molten slag or scale in both borders of the hearth along the side walls 13 and 14.
  • the hearth 18 has gentle slopes which descend from the top at the center of the hearth to both borders along the side walls 13 and 14.
  • the molten slag or scale, which falls down from the slab 17 to the hearth 18, is therefore caused to flow into the extraction slots 21.
  • Slag or scale melting burners 23 located on the side walls enhance the flowability of the molten slag or scale on the hearth 18.
  • the skid beams 1 to 10 are supported by water-cooled posts 19 and 24, which are described in detail below.
  • a bank 30 is formed on the hearth 18 so that the inner wall of the bank 30 surrounds each of the slots 20 through which the water-cooled posts 19 for supporting the movable skid beams protrude.
  • the banks 30 prevent the influx of the molten slag or scale into the slots 20.
  • a beveled body 48 is rigidly secured to each of the water-cooled posts 19 and prevents the flow of the molten slag or scale along the posts 19 into the slots 20 and the dropping of the molten slag or scale directly into the slots 20.
  • FIGs. 3 and 4 the structure of the skid tubes and . water-cooled posts is illustrated in detail.
  • reference numeral 31 indicates a skid tube having a rectangular cross section and reference numeral 32 indicates a skid rail.
  • a core tube 34 is accomodated in a water-cooled post 19(24) to water-cool the post 19(24).
  • a metallic post head 35 is provided on the water-cooled post 19(24) and supports the skid tubes 31.
  • the post head 35 has a trough-shaped cross section and the length (t) of the trough-shaped post head is greater than the outer diameter (d) of the water-cooled posts 19(24) which are made of metallic tubes.
  • the number of water cooled posts is approximately one half of that in a walking beam type heating furnace where l is equal to d.
  • the number of stationary skid beams is five and each of the stationary skid beams is supported by sixteen water-cooled posts.
  • the total number of the water-cooled posts for supporting the stationary skid beams is, therefore, eighty.
  • the number of movable skid beams is four and each of the movable skid beams is supported by sixteen water cooled posts which are driven so as to realize the movement of the movable skid beams.
  • the total number of the driven water-cooled posts is, therefore, sixty-four.
  • the number of water-cooled posts necessary for supporting one stationary skid beam of similar capacity to the particular furnace mentioned above is decreased from the sixteen mentioned above to nine.
  • the number of water-cooled posts for supporting one movable skid beam is decreased from the sixteen mentioned above to eight.
  • the total number of the water cooled posts is, therefore, decreased from 144 in the particular conventional walking beam type heating furnace mentioned above to 72 in the comparable furnace according to the present invention.
  • a bracket 37 is fixed to the lower surface of the skid tube 31 along the longitudinal direction of the skid tube.
  • a trough-shaped upper receiving portion 36 of the post head 35 is contiguous to a lower neck portion 40 thereof.
  • the bracket 37 is secured to the post head by a pin connection through a positioning pin and a nut 38. Since the pin and nut are removable, the skid tubes 31 can be easily disassembled from the post head, if necessary.
  • a highly heat-conductive material 39 for example SiC, is filled between the skid tube 31 and the inner surface of the post head 35.
  • the skid tube 31 is welded to the circumference of the trough-shaped receiving portion 36 by a weld 41.
  • a cooling effect extends from the skid tube 31 and water-cooled post 19(24) to the post head 40.
  • the cooling effect extended from the skid tube 31 and the water cooled post 19(24) is least at the thin neck portion 40. Therefore, the thin neck portion 40 is subjected to external high temperature heat and is likely to lose its supporting function due to buckling. Consequently, a thick refractory layer 42, which is highly heat-insulating is formed on the neck portion 40.
  • the refractory layer 42 may be ceramic fiber layers.
  • Stainless sheets 43 are applied on the refractory layer 42.
  • Stud pins 45 shown in Fig. 4 are rigidly secured to the water cooled posts 19(24) and the skid tube 31.
  • a refractory layer 46 covers all of the members of the skid tubes and the water cooled posts, so as to protect these members from the molten slag or scale which is generated by the melting of scale from the material being heated.
  • the material of the refractory layer 46 is selected from such groups of materials as ceramic refractories which are not eroded by the molten slag or scale.
  • the water cooled posts according to the present invention greatly contribute to the operation of a walking beam type heating furnace and reduction of the heat withdrawal as compared with the prior art, because the load supporting system is realized by greatly increasing the distance between the fulcrums as compared with the prior art.
  • the banks 30 and the posts 24 of stationary skid beams are arranged in a zigzag pattern, while the coventional skid beam arrangement pattern is linear, as seen in Fig. 5.
  • the free space in between,having a distance.(L) is large as compared to the free space in the arrangement in Fig. 5.
  • the free space between an adjacent post and bank,having a distance (L') is also large.
  • the operation of the furnace must be interrupted so as to withdraw the molten slag or scale from the furnace.
  • the number of such interruptions of furnace operation is low. Consequently, compared to the prior art, in the present invention the heat loss due to interruption of the furnace operation is low and hence the degree by which the furnace is cooled is decreased. As a result, the amount of fuel necessary to heat the steel is less than in the prior art and, in addition, the maintainance costs involved in the withdrawal of the molten slag or scale from the furnace are low.
EP19800101690 1979-03-30 1980-03-28 Ofen zum Erwärmen von Brammen Expired EP0017830B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP41819/79 1979-03-30
JP38232/79 1979-03-30
JP4181979U JPS55142562U (de) 1979-03-30 1979-03-30
JP3823279A JPS55131119A (en) 1979-03-30 1979-03-30 Support structure of skid pipe in heating furnace

Publications (2)

Publication Number Publication Date
EP0017830A1 true EP0017830A1 (de) 1980-10-29
EP0017830B1 EP0017830B1 (de) 1984-06-13

Family

ID=26377435

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800101690 Expired EP0017830B1 (de) 1979-03-30 1980-03-28 Ofen zum Erwärmen von Brammen

Country Status (2)

Country Link
EP (1) EP0017830B1 (de)
DE (1) DE3068164D1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0280079A1 (de) * 1987-02-24 1988-08-31 ITALIMPIANTI Società Italiana Impianti p.a. Hubbalkenofen
EP0350146A1 (de) * 1988-07-05 1990-01-10 Cameron Forge Company Wärmeschutz für einen Gleichschrittofen
CN104818497A (zh) * 2015-04-17 2015-08-05 郑州经纬科技实业有限公司 电解铝用阴极炭块预热装置及其使用方法

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE563976C (de) * 1932-11-12 Ofenbau Ges M B H Stuetzpfeiler fuer frei tragende Stossofen-Gleitrohre
US2235771A (en) * 1939-10-23 1941-03-18 Surface Combustion Corp Continuous heating furnace
AT223640B (de) * 1961-02-21 1962-10-10 Amsler Morton Industrieofenbau Stoßofen
FR1325350A (fr) * 1962-06-12 1963-04-26 Brockmann & Bundt Ind Ofenbau Système d'avancement pour fours à pas de pèlerin
US3089687A (en) * 1960-11-18 1963-05-14 Selas Corp Of America Walking beam mechanism
US3220712A (en) * 1961-08-29 1965-11-30 Jack D Lott Skid support construction
US3345050A (en) * 1965-08-25 1967-10-03 Loftus Engineering Corp Furnace skid rails
DE1758288B1 (de) * 1967-06-26 1971-01-28 Ishikawajima Harima Heavy Ind Hubbalkenofen
GB1241009A (en) * 1968-02-26 1971-07-28 Midland Ross Corp Walking beam conveyor
US3637198A (en) * 1970-01-12 1972-01-25 Koppers Wistra Ofenbau Gmbh Furnace for heat treating of metallic workpieces
JPS472739U (de) * 1971-01-27 1972-08-31
JPS4915U (de) * 1972-04-05 1974-01-05
DE2706711A1 (de) * 1977-02-17 1978-08-24 Koppers Wistra Ofenbau Gmbh Gekuehlte tragkonstruktion fuer waermoefen und verfahren zur kuehlung der tragkonstruktion
FR2380519A1 (fr) * 1977-02-11 1978-09-08 Koppers Wistra Ofenbau Gmbh Sommier refroidi pour fours de chauffage

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE563976C (de) * 1932-11-12 Ofenbau Ges M B H Stuetzpfeiler fuer frei tragende Stossofen-Gleitrohre
US2235771A (en) * 1939-10-23 1941-03-18 Surface Combustion Corp Continuous heating furnace
US3089687A (en) * 1960-11-18 1963-05-14 Selas Corp Of America Walking beam mechanism
AT223640B (de) * 1961-02-21 1962-10-10 Amsler Morton Industrieofenbau Stoßofen
US3220712A (en) * 1961-08-29 1965-11-30 Jack D Lott Skid support construction
FR1325350A (fr) * 1962-06-12 1963-04-26 Brockmann & Bundt Ind Ofenbau Système d'avancement pour fours à pas de pèlerin
US3345050A (en) * 1965-08-25 1967-10-03 Loftus Engineering Corp Furnace skid rails
DE1758288B1 (de) * 1967-06-26 1971-01-28 Ishikawajima Harima Heavy Ind Hubbalkenofen
GB1241009A (en) * 1968-02-26 1971-07-28 Midland Ross Corp Walking beam conveyor
US3637198A (en) * 1970-01-12 1972-01-25 Koppers Wistra Ofenbau Gmbh Furnace for heat treating of metallic workpieces
JPS472739U (de) * 1971-01-27 1972-08-31
JPS4915U (de) * 1972-04-05 1974-01-05
FR2380519A1 (fr) * 1977-02-11 1978-09-08 Koppers Wistra Ofenbau Gmbh Sommier refroidi pour fours de chauffage
DE2706711A1 (de) * 1977-02-17 1978-08-24 Koppers Wistra Ofenbau Gmbh Gekuehlte tragkonstruktion fuer waermoefen und verfahren zur kuehlung der tragkonstruktion

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0280079A1 (de) * 1987-02-24 1988-08-31 ITALIMPIANTI Società Italiana Impianti p.a. Hubbalkenofen
EP0350146A1 (de) * 1988-07-05 1990-01-10 Cameron Forge Company Wärmeschutz für einen Gleichschrittofen
CN104818497A (zh) * 2015-04-17 2015-08-05 郑州经纬科技实业有限公司 电解铝用阴极炭块预热装置及其使用方法
CN104818497B (zh) * 2015-04-17 2017-05-10 郑州经纬科技实业有限公司 电解铝用阴极炭块预热装置及其使用方法

Also Published As

Publication number Publication date
EP0017830B1 (de) 1984-06-13
DE3068164D1 (en) 1984-07-19

Similar Documents

Publication Publication Date Title
US5033926A (en) Heat retaining means
US3829595A (en) Electric direct-arc furnace
RU2203961C2 (ru) Фурма для подвода сырьевого материала и способ введения твердых сырьевых материалов в металлургическую емкость
US4391587A (en) Slab heating furnace
CA2333899C (en) Heat exchange pipe with extruded ridges
EP0017830A1 (de) Ofen zum Erwärmen von Brammen
KR101224941B1 (ko) 마이크로웨이브를 이용한 퍼니스
RU2281974C2 (ru) Охлаждающий элемент для охлаждения металлургической печи
US3412195A (en) Intermediate furnace barrier
US4435814A (en) Electric furnace having liquid-cooled vessel walls
US4582482A (en) Top-fired, walking hearth-type furnace
US5431375A (en) Cooled cylinders for handling steel products
RU2802700C1 (ru) Крышка промежуточного ковша
CA1160834A (en) Walking beam furnace
CN206019307U (zh) 连续式真空蒸馏用的保温熔炉
JPS62177116A (ja) 中間装入式ウオ−キングビ−ム加熱炉
JPH0377850B2 (de)
US2508739A (en) Multiple-layer hearth structure for metallurgical furnaces
KR850000929B1 (ko) 주철관의 열처리장치
KR101127937B1 (ko) 가열로의 퇴적 스케일 균일화장치
JP2911688B2 (ja) 竪型誘導加熱炉の炉壁
CA1248349A (en) Movable sill furnace for heating iron metallurgy products
GB2174985A (en) Furnace sill cooling
RU2056026C1 (ru) Тепловая изоляция вертикальных подовых труб
SU863986A1 (ru) Балка нагревательной печи

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed
AK Designated contracting states

Designated state(s): BE DE FR GB IT

ITF It: translation for a ep patent filed

Owner name: STUDIO TORTA SOCIETA' SEMPLICE

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): BE DE FR GB IT

REF Corresponds to:

Ref document number: 3068164

Country of ref document: DE

Date of ref document: 19840719

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
BERE Be: lapsed

Owner name: NIPPON STEEL CORP.

Effective date: 19880331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19881118

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19881130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19881201

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19890331