EP0063549B1 - Couvercle refroidi pour fours électriques - Google Patents

Couvercle refroidi pour fours électriques Download PDF

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Publication number
EP0063549B1
EP0063549B1 EP82830070A EP82830070A EP0063549B1 EP 0063549 B1 EP0063549 B1 EP 0063549B1 EP 82830070 A EP82830070 A EP 82830070A EP 82830070 A EP82830070 A EP 82830070A EP 0063549 B1 EP0063549 B1 EP 0063549B1
Authority
EP
European Patent Office
Prior art keywords
crown
electric furnaces
cooled
cooling
hereinbefore
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
EP82830070A
Other languages
German (de)
English (en)
Other versions
EP0063549A1 (fr
Inventor
Adriano Meroi
Paolo Iuri
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
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 Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Priority to AT82830070T priority Critical patent/ATE15264T1/de
Publication of EP0063549A1 publication Critical patent/EP0063549A1/fr
Application granted granted Critical
Publication of EP0063549B1 publication Critical patent/EP0063549B1/fr
Expired 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids or removable covers
    • F27D1/1808—Removable covers
    • F27D1/1816—Removable covers specially adapted for arc furnaces

Definitions

  • This invention concerns a cooled crown for electric furnaces.
  • this invention concerns a crown cooled by circulation of water under pressure, said crown being suitable for being installed on electric furnaces with or without any additional holes.
  • This invention entails many drawbacks.
  • the first is due to the coil-shaped arrangement of the tubes with many welds between straight and curved tracts, thus involving the danger of cracks 'and'breakages.
  • connection by sectors which is obtained with the radial conduits 30-32 may lessen the risk of semi-heating the water but it creates further welded points with extra points of concentration of stresses.
  • system of support of the coils creates insufficiently cooled areas and points of contact between the parts with tensions and differing expansions.
  • lay-outs proposed do not enable energy consumption to be kept low; they are costly and involve very long construction and installation times.
  • This new type of crown provides many advantages consequent upon the specific pre-set purposes.
  • Another advantage is the increase in the life span of the middle part of the crown, the outcome of this being a yet greater productivity of the furnace.
  • a further advantage is the increase in productivity following on the drastic reduction in down times.
  • the invention therefore, leads to a restraining of energy consumption in that refractory material is envisaged as being positioned between one tube and another. Moreover, the invention enables construction and installation times to be reduced with a noteworthy working safety.
  • the invention permits easy replacement of elements in case of a breakdown in one or more of said elements.
  • the various panels are suspended and upheld by an independent carrying frame which weighs on the perimeter of the furnace itself, and this fact increases the safety of the overall whole since, amongst other things, the panels are not stressed by dynamic forces.
  • the invention visualizes a supporting structure which has at least one outer supporting element having a substantially annular shape and consisting advantageously of a conduit for fluids, said outer element lying directly on the perimeter of the electric furnace and cooperating with a tubular element which has a circular or, more generically, polygonal shape and which is located within said outer element in a higher position.
  • Said tubular element is supported by a plurality of tubular risers connecting the circumferential tubular element with the outer hollow supporting ring so as to permit hydraulic continuity in the circulation of the cooled fluid.
  • the circumferential tubular element can perhaps include one or more auxiliary circumferential elements cooperating with a possible hole for charging operations carried out through the crown itself or for other work.
  • Panels to cool the crown are fitted below said supporting structure so that they are located substantially between said supporting structure itself and the inside of the furnace.
  • Said panels to cool the crown consist of two tubular elements connected to each other by a plurality of other tubular elements arranged substantially radially and having the advantage of a section possessing an inverted oval development.
  • a cap consisting of elements with the shape of an inverted “L” are supported on the tubular element.
  • the cap which serves to carry the refractory material that positions and insulates the electrodes.
  • An appropriate ring for circulation of fluid can be envisaged instead of the plurality of spokes with cooling tubes.
  • one or more cooling rings can be envisaged as being around the electrodes.
  • the invention therefore consists substantially of a plurality of parts having well defined functions: a supporting structure consisting of a substantially annular outer element and of an inner element, said elements being connected to each other hydraulically with appropriate risers, whereby said supporting structure sustains on its lower side a plurality of panels to cool the crown which can be either normal or of a specialized kind, and whereby on the tubular element is borne a cap which has on its periphery supporting means for circulation of fluid which serve to anchor and position the refractory material connected to the electrodes.
  • cooling panels include the primary manifolds as perimetric sectors and the tubes are positioned substantially radially.
  • Said tubular risers 46 are arranged substantially radially between the tubular elements 24 and 25 so as to form therewith, in this example, a circular crown, whereby said circular crown, and substantially the whole cooled crown 20, can be flat or dome-shaped or be disposed in a series of suspended surfaces.
  • Said carrying structure 21 bears the cooling panels 22 by means of welded elements or elements which can be dismantled or by means of known means.
  • Said cooling panels 22, which are divided between specialized panels and normal panels, depending on how they are to be employed, have in the example of Figs. 1 and 3 a form consisting substantially of sectors of a circular crown and are able, when connected to each other, to occupy a zone which is conformed like a circular crown and is at least partially lower than the zone occupied by the carrying structure 21.
  • the cooling panels 22 normally used consist of two primary manifolds 26-27, which in this instance are conformed like an arc of a circumference and are positioned concentrically, and of a plurality of tubes 28 connecting the two primary manifolds 26-27 together radially and having at their opposite ends substantially elliptic sections with inverted principal axes.
  • This special shape of the tubes 28 enables the cooling fluid to be distributed evenly over the enveloping surface divided into sectors of circular crown and occupied by each cooling panel 22, as shown in Figs. 1 and 4.
  • the cooled crown also includes a cooling panel 122 of a specialized kind for the charging of material into the electric furnace, said panel 122 being substantially like those 22 normally employed.
  • At least one variant is possible which consists of the charging intake 47 delimited by a conduit 30, which has a toroidal shape and is connected hydraulically to at least part of the tubes 28 and is disposed in the middle thereof.
  • Another panel 222 of a specialized kind has an aspiration outlet 29 for fumes which is delimited by a conduit 52 of toroidal shape connected hydraulically to the inner manifold 26 and to at least part of the tubes 28.
  • Cooling coil means 33 are arranged to pass through the two outlets 29 and 31 so as to get better dispersion of the heat radiated by the fumes leaving the electric furnace at a very high temperature.
  • cooling panels 22 are at least partially sunk in a structure of refractory material 34, whereby said structure of refractory material 34 is put between the tubes 28 and also substantially around them so as to enwrap them, and whereby said structure 34 is supported by said tubes 28 by virtue of the special inverted-ellipse shape of the latter, as shown in Fig. 10.
  • Said cooling panels 22, being thus constituted, are welded together so as to form a modular structure conformed, in this instance, like a circular crown.
  • said panels 22 comprise end joints 35 shaped so as to make possible an easy mutual connection and an easy separation whenever a possible replacement of said panels 22 may be required.
  • said means 37 are employed to bleed off the air and steam and consist substantially of tubular elements perhaps conformed elbow-wise, of which the intake is turned towards that part of the inner surface of the manifold 26 which is located at the highest level thereof, as'shown in Fig. 6.
  • some through holes 41 are visualized as being machined through the uppermost part of the partition walls 40 so that the neighbouring sectors 39 can communicate with each other. This assists the circulation of the air and the withdrawal of the latter through the bleeder means 37.
  • Fig. 3 shows a lengthwise section of a tubular riser 26, which in this instance is conformed so as to permit a two-way circulation of cooling fluid.
  • the cap 23 consists substantially of supporting means 50 which circulate fluid and comprise a plurality of spoke elements 42 arranged radially and conformed, for instance, like an inverted "L", whereby said spokes 42 rest on or are located on the inner, hollow, tubular element 25 and bear one or more rows of cooling tubes 43.
  • one or more cooling rings can be visualized as being around the electrodes.
  • said cooled crown 20 of Figs. 8 and 9 has a carrying structure 21 of which the perimetric tubular element 24 consists here of two tubular units 124-224, whereby each of said tubular units 124-224 has cooling fluid running through it in a given direction.
  • Fig. 8 also shows the openings 48--49-148-149 for the inflow and outflow of the cooling fluid into and out of the tubular units 124-224.
  • the substantial differences of the embodying variant as compared to the preceding lay-out consists of the substantially triangular shape of the new tubular element 25 and, correspondingly, of the cap 23 as well as of the different positioning of the aspiration outlet 29 for fumes and of the charging inlet 47.
  • said aspiration outlet 29 is positioned inside the corresponding specialized panel 222 and does not affect the cap 23.
  • conduit 32 is not included which in the preceding case delimited the outlet 29 at its upper part and which was connected hydraulically to the tubular element 25.
  • the cooled crown 20 comprises supporting means 51 able to permit ready handling for a possible displacement of said cooled crown 20.
  • cooling panels 22 consisting of one or more circumferential tubes and of tubes branching off from the latter and returning thereto after inverting their own direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Baking, Grill, Roasting (AREA)
  • Resistance Heating (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (17)

1. Couronne refroidie (20) pour fours électriques, caractérisée en ce qu'elle est formée de multiples éléments tubulaires et comprend une structure porteuse (21) composée d'au moins un élément périmétral tubulaire extérieur (24) et d'un élément tubulaire intérieur (25), reliés hydrauliquement entre eux par des conduits montants tubulaires appropriés (46), de multiples panneaux (22) servant à refoidir la couronne (20), qui sont formés essentiellement de deux collecteurs primaires (26, 27) et de plusieurs tubes (28), et un chapeau (23) comprenant des moyens de soutien (50) qui font circuler du fluide, les panneaux de refroidissement (22) comprenant les collecteurs primaires (26, 27) comme secteurs périmétraux et les tubes (28) étant pratiquement placés radialement.
2. Couronne refroidie pour fours électriques selon la revendication 1, caractérisée en ce que les panneaux (22) comprennent aussi ceux qui enferment une ouverture de four (122, 222).
3. Couronne refroidie pour fours électriques selon l'une des revendications 1 et 2, caractérisée en ce qu'au moins un des collecteurs primaires (26, 27) inclus dans les panneaux de refroidissement (22) est pratiquement concentrique à l'élément périmétral tubulaire extérieur (24).
4. Couronne refroidie pour fours électriques selon l'une quelconque des revendications précédentes, caractérisée en ce que les éléments tubulaires (26, 27) formant un panneau de refroidissement (22) ont pratiquement la même forme longitudinale que la partie de l'élément tubulaire creux (24, 25) qui coopère avec eux.
5. Couronne refroidie pour fours électriques selon l'une quelconque des revendications précédentes, caractérisée en ce que les tubes (28) des panneaux de refroidissement (22) ont une section pratiquement elliptique à axe renversé.
6. Couronne refroidie pour fours électriques selon l'une quelconque des revendications 1 à 4, caractérisée en ce que les tubes (28) des panneaux de refroidissement (22) ont une section pratiquement circulaire.
7. Couronne refroidie pour fours électrique selon l'une quelconque des revendications précédentes, caractérisée en ce que les tubes (28) des panneaux de refroidissement (22) sont branchés en vue d'une circulation dans des sens alternés (figure 4).
8. Couronne refroidie pour fours électriques selon l'une quelconque des revendications précédentes, caractérisée en ce que les panneaux de refroidissement (22) présentent à l'extérieur une structure de matière réractaire (34) (figure 3).
9. Couronne refroidie pour fours électriques selon l'une quelconque des revendications précédentes, caractérisée en ce que les panneaux de refroidissement (22) sont au moins partiellement noyés dans une structure de matière réfractaire (34).
10. Couronne refroidie pour fours électriques selon l'une quelconque des revendications précédentes, caractérisée en ce que les tubes (28) des panneaux de refroidissement (22) sont au moins partiellement noyés dans une structure de matière réfractaire (34).
11. Couronne refroidie pour fours électriques selon l'une quelconque des revendications 1 à-7, caractérisée en ce que l'élément tubulaire intérieur (25) est pratiquement circulaire (figure 1).
12. Couronne refroidie pour fours électriques selon l'une quelconque des revendications 1 à 7, caractérisée en ce que l'élément tubulaire intérieur (25) est pratiquement polygonal (figure 8).
13. Couronne refroidie pour fours électriques selon l'une quelconque des revendications précédentes, caractérisée en ce que un conduit (32) coopère avec au moins un panneau de refroidissement (222) qui enferme une ouverture de four.
14. Couronne refroidie pour fours électriques selon l'une quelconque des revendications précédentes, caractérisée en ce que un serpentin (33) coopérant avec l'élément tubulaire intérieur (25) (figure 2) coopère avec au moins un panneau de refroidissement (222) qui enferme une ouverture de four.
15. Couronne refroidie pour fours électriques selon l'une quelconque des revendications précédentes, caractérisée en ce que les panneaux de refroidissement (22) sont situés au-dessus de la structure porteuse (21).
16. Couronne refroidie pour fours électriques selon l'une quelconque des revendications 1 à 14, caractérisée en ce que les panneaux de refroidissement (22) sont situés en dessous de la structure porteuse (21).
17. Couronne refroidie pour fours électriques selon l'une quelconque des revendications précédentes, caractérisée en ce que le chapeau (23) présente au moins une entrée de chargement (47).
EP82830070A 1981-04-14 1982-03-24 Couvercle refroidi pour fours électriques Expired EP0063549B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82830070T ATE15264T1 (de) 1981-04-14 1982-03-24 Gekuehlter deckel fuer elektrooefen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8336081 1981-04-14
IT83360/81A IT1146768B (it) 1981-04-14 1981-04-14 Volta raffreddata per forni elettrici

Publications (2)

Publication Number Publication Date
EP0063549A1 EP0063549A1 (fr) 1982-10-27
EP0063549B1 true EP0063549B1 (fr) 1985-08-28

Family

ID=11320709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82830070A Expired EP0063549B1 (fr) 1981-04-14 1982-03-24 Couvercle refroidi pour fours électriques

Country Status (6)

Country Link
EP (1) EP0063549B1 (fr)
AT (1) ATE15264T1 (fr)
DE (1) DE3265733D1 (fr)
ES (1) ES511361A0 (fr)
GR (1) GR76696B (fr)
IT (1) IT1146768B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUD960018A1 (it) * 1996-02-13 1997-08-14 Danieli Off Mecc Volta raffreddata per forni elettrici ad arco e per forni siviera

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE937442C (de) * 1952-09-03 1956-01-05 Demag Elektrometallurgie Gmbh Elektrischer Lichtbogenofen mit geteiltem Deckel
US3429973A (en) * 1965-09-02 1969-02-25 Frederick H N Carter Furnace construction
US3967048A (en) * 1975-06-06 1976-06-29 Longenecker Levi S Dual ring supported roof for electric arc furnace
DE2805263C2 (de) * 1977-02-08 1983-09-08 Daidotokushuko K.K., Nagoya, Aichi Wassergekühlter Ofendeckel
DE2759713C2 (de) * 1977-10-11 1983-10-27 Mannesmann AG, 4000 Düsseldorf Gefäßdeckel für einen Metallschmelzofen, insbesondere elektrischen Lichtbogenofen
DE2817869C3 (de) * 1978-04-24 1983-04-07 Krupp Stahl Ag, 4630 Bochum Deckel für einen Elektrolichtbogenofen
US4216348A (en) * 1979-02-09 1980-08-05 Wean United, Inc. Roof assembly for an electric arc furnace
LU81209A1 (de) * 1979-05-02 1979-09-10 Sidepal Sa Wassergekuehlter deckel fuer industrieoefen

Also Published As

Publication number Publication date
ATE15264T1 (de) 1985-09-15
ES8303670A1 (es) 1983-03-01
IT8183360A0 (it) 1981-04-14
DE3265733D1 (en) 1985-10-03
ES511361A0 (es) 1983-03-01
GR76696B (fr) 1984-08-28
EP0063549A1 (fr) 1982-10-27
IT1146768B (it) 1986-11-19

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