EP0063549A1 - Couvercle refroidi pour fours électriques - Google Patents

Couvercle refroidi pour fours électriques Download PDF

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Publication number
EP0063549A1
EP0063549A1 EP82830070A EP82830070A EP0063549A1 EP 0063549 A1 EP0063549 A1 EP 0063549A1 EP 82830070 A EP82830070 A EP 82830070A EP 82830070 A EP82830070 A EP 82830070A EP 0063549 A1 EP0063549 A1 EP 0063549A1
Authority
EP
European Patent Office
Prior art keywords
crown
fact
electric furnaces
cooled
thereafter
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
EP82830070A
Other languages
German (de)
English (en)
Other versions
EP0063549B1 (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 ENGINEERING SpA
Danieli Eng SpA
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 ENGINEERING SpA, Danieli Eng SpA, Danieli and C Officine Meccaniche SpA filed Critical DANIELI ENGINEERING 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, 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 ooncerns 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.
  • patent US 42I6348 envisages tubes arranged . substantially like a spider's web, while Russian patent 6I767I sets forth a crown with an intermediate chamber suitable for an irregular circulation of water.
  • 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.
  • Another advantage again is the ability to re-use the water for other purposes too, as it is possible to regulate the heat exchange within preferential selected values.
  • 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 6f 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 substant - ially annular shape and consisting advantageously of a con-. .duit for fluids, said outer element lying dtrectly on the .perimeter of the electric furnace and cooperating with a tubular element which has a circular or, more genertcally, .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 hy- .draulic 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 support- .ing 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.
  • Said elements with the shape of an inverted "L" can be a plurality of spokes resting on the circumferential tubular element and bearing one or more rows of cooling tubes.
  • 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.
  • the tubular element can include an auxiliary circumferential element; if so, said auxiliary circumferential element will comprise cooling coil means able to invest the depth of the refractory material itself.
  • the invention is therefore embodied in a cooled crown for electric furnaces, whereby the cooled crown is composed of a plurality of tubular elements and is characterized by comprising in mutual cooperation and coordination:
  • Figs.I and 2 show an embodiment of the cooled crown 20 of the invention.
  • Said cooled crown 20 consists substantially of a carrying structure 2I able to bear a plurality of cooling panels 22 and of an arch or cap 23 positioned on the middle of the cooled crown 20.
  • Said carrying structure 2I consists, in this instance, .of an outer, tubular, perimetric element 24 having a circumferential shape and of an inner, tubular element 25 also having a circumferential shape, whereby the two elements 24 .and 25 are connected to each other hydraulically with a plurality of tubular risers 46.
  • Said tubular risers 46 are arranged substantially radi- .ally between the tubular elements 24 and 25 so as to form . therewith 24-25, 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 2I bears the cooling panels 22. .by means of welded elements or elements which can be disman- .tled or by means of known means.
  • the cooling panels 22 normally used consist of two prt- mary 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. I and 4.
  • the cooled crown also includes a cooling panel 122 of .a specialized kind for the charging of materials into the .electric furnace, said panel I22 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 . 28.
  • 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 3I 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 28 so as to en-. wrap 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.I0.
  • 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.
  • Fig.5 shows a detail of the connection of the tubes 28. .to the manifold 27 and of the connection of said manifold 2? to the conduit 36 delivering or taking away the cooling fluid. .
  • the same kind of connection can be envisaged as existing be- .tween the tubes 28 and manifold 26..
  • Figs.6 and 7 show means 37 for bleeding off the air and any steam forming in the tubes owing to the high temperature .of the fluid circulating.
  • the air tends to gather in the high part of the manifold 26, which .in its turn is usually positioned at a level higher than the remainder of the pipes in the panel 22.
  • said means 37 are employed .to bleed off the air and steam and consist substantially of tubular elements/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.
  • Said Fig.6 also shows a delivery hole 38 able to facilitate the passage of air but to keep to a minimum the passage of cooling fluid.
  • the manifolds 26-27 can be divided by partition walls 40 into separate neighbouring sectors 39, as shown diagrammatically in Figs. 4 and 7.
  • some through holes 4I 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.
  • Bleeder means 37 the same as or like those described . just now can also be envisaged in the inner tubular element 25.
  • 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.
  • Figs.I, 2 and 3 show the cap 23 disposed so as to shut the top of the cooled crown 20.
  • said cap 23 is upheld by the carrying structure 2I and is located on the inner, tubular element 25. Owing to this lay-out the cap 23 can be readily exchanged when so needed.
  • 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.
  • the refractory material 44 which serves to position and insulate the electrodes, whereby said electrodes. can be inserted in suitable through holes 45 machined in said cap 23.
  • one or more cooling rings can be visualized as being around the electrodes.
  • the cooled crown 20 can also be as shown in Figs, 8 and 9.
  • said cooled crown 20 of Figs.8 and 9 has a carrying structure 2I of which the perimetric tubular element 24 consists here of two tubular units I24-224, whereby each of said tubular units I24-224 has cooling fluid running through it in a given direction.
  • Fig.8 also shows the openings 48-49-I48-I49 for the inflow and outflow of the cooling fluid into and out of the tubular units I24-224.
  • the substantial differences of the embodying variant as compared to the preceding lay-out consist of the substant- tally 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 5I able to permit ready handling for a possible displacement of said cooled crown 20..
  • the cap 23 has a . polygonal shape or that the tubular element 25 is conformed correspondingly or is polygonal; it can also be visualized. that the element 24 has pertmetrtc developments of a different shape, for instance, elliptic, polygonal, etc.
  • 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)
  • Constitution Of High-Frequency Heating (AREA)
  • Baking, Grill, Roasting (AREA)
  • Resistance Heating (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
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
IT83360/81A IT1146768B (it) 1981-04-14 1981-04-14 Volta raffreddata per forni elettrici
IT8336081 1981-04-14

Publications (2)

Publication Number Publication Date
EP0063549A1 true EP0063549A1 (fr) 1982-10-27
EP0063549B1 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) ES8303670A1 (fr)
GR (1) GR76696B (fr)
IT (1) IT1146768B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0790474A1 (fr) * 1996-02-13 1997-08-20 DANIELI & C. OFFICINE MECCANICHE S.p.A. Toit refroidit pour fours ou poches à arc

Citations (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
DE2805263A1 (de) * 1977-02-08 1978-08-17 Daido Steel Co Ltd Wassergekuehlter ofendeckel
FR2404818A1 (fr) * 1977-10-11 1979-04-27 Demag Ag Creuset pour four de fonderie, en particulier pour four a arc electrique
FR2424498A1 (fr) * 1978-04-24 1979-11-23 Krupp Ag Huettenwerke Couvercle de four a arc
US4216348A (en) * 1979-02-09 1980-08-05 Wean United, Inc. Roof assembly for an electric arc furnace
FR2455719A1 (fr) * 1979-05-02 1980-11-28 Sidepal Sa Couvercle refroidi par eau pour fours industriels

Patent Citations (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
DE2805263A1 (de) * 1977-02-08 1978-08-17 Daido Steel Co Ltd Wassergekuehlter ofendeckel
FR2404818A1 (fr) * 1977-10-11 1979-04-27 Demag Ag Creuset pour four de fonderie, en particulier pour four a arc electrique
FR2424498A1 (fr) * 1978-04-24 1979-11-23 Krupp Ag Huettenwerke Couvercle de four a arc
US4216348A (en) * 1979-02-09 1980-08-05 Wean United, Inc. Roof assembly for an electric arc furnace
FR2455719A1 (fr) * 1979-05-02 1980-11-28 Sidepal Sa Couvercle refroidi par eau pour fours industriels

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0790474A1 (fr) * 1996-02-13 1997-08-20 DANIELI & C. OFFICINE MECCANICHE S.p.A. Toit refroidit pour fours ou poches à arc

Also Published As

Publication number Publication date
ES511361A0 (es) 1983-03-01
EP0063549B1 (fr) 1985-08-28
IT1146768B (it) 1986-11-19
IT8183360A0 (it) 1981-04-14
DE3265733D1 (en) 1985-10-03
ES8303670A1 (es) 1983-03-01
ATE15264T1 (de) 1985-09-15
GR76696B (fr) 1984-08-28

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