EP0579146A1 - Gekühltes Wandelement für metallurgische Öfen - Google Patents

Gekühltes Wandelement für metallurgische Öfen Download PDF

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Publication number
EP0579146A1
EP0579146A1 EP93111098A EP93111098A EP0579146A1 EP 0579146 A1 EP0579146 A1 EP 0579146A1 EP 93111098 A EP93111098 A EP 93111098A EP 93111098 A EP93111098 A EP 93111098A EP 0579146 A1 EP0579146 A1 EP 0579146A1
Authority
EP
European Patent Office
Prior art keywords
tubes
pipes
wall element
row
element 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Withdrawn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
EP93111098A
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German (de)
English (en)
French (fr)
Inventor
Ekkehard E. Dr.-Ing. Hammer
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.)
Hammer Friedrich-Wilhelm
Original Assignee
Hammer Friedrich-Wilhelm
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 Hammer Friedrich-Wilhelm filed Critical Hammer Friedrich-Wilhelm
Publication of EP0579146A1 publication Critical patent/EP0579146A1/de
Withdrawn legal-status Critical Current

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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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
    • F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for 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
    • F27D1/12—Casings; Linings; Walls; Roofs incorporating cooling arrangements

Definitions

  • the invention relates to a cooled wall element for metallurgical furnaces, in particular electric arc furnaces, for attachment in the area above the molten bath level, with a plurality of tubes of a heat-conducting material arranged in parallel and connected to one another and connected to one another, the wall element two, each with a different distance from the center of the furnace arranged rows of coolant-carrying tubes and the individual tubes of the outer row of tubes each run between the tubes of the inner row of tubes.
  • a generic wall element is described in EP 0 140 401 A1; the known wall element consists of tubes placed parallel to one another in the vertical and through which a cooling medium flows, the individual tubes being arranged with a radial offset to the center of the furnace in such a way that an inner and an outer row of tubes result.
  • the adjacent tubes of the inner and outer row of tubes are placed without any distance from one another and welded together on their long sides; for the passage of the cooling medium, the tubes of the inner tube row are mutually connected to the tubes of the outer tube row via corresponding pipe elbows, so that a meandering continuous flow of cooling medium results in the individual tubes.
  • the known wall element has the disadvantage that the pressure loss in the cooling medium circuit increases with an increasing number of individual tubes.
  • the many pipe elbows require numerous welds in the thermally highly stressed area.
  • the invention is therefore based on the object of improving the insulating effect in a cooled wall element of the type mentioned.
  • the basic idea of the invention provides that the individual tubes of the inner row of tubes are arranged at a distance from the tubes of the outer row of tubes and alternately with the tubes of the outer row of tubes by means of Distance bridging sheets are connected to form gussets lying between the tubes and open to the inside of the furnace and that the individual tubes of the inner row of tubes and the outer row of tubes are connected on one side to a central manifold.
  • the invention has the advantage that due to the spaced arrangement of the individual tubes of the inner and outer row of tubes to each other between the individual tubes and open to the furnace space cavities are created, in which slag can collect and cling during the melting process. Since these cavities are cooled by the tubes arranged at three points and are supported by the metal sheets forming the boundary of the cavity, the formation of a slag coating filling the gusset between the tubes occurs, due to the cooling effect and the mechanical Supporting effect of the limiting tube-sheet-tube construction can be regarded as particularly stable. The thermal insulation effect of the wall element according to the invention is thus significantly improved.
  • the invention has the further advantage that, owing to the one-sided connection of the individual pipes to a central manifold, there is no deflection bends and the number of pipe connections required is kept low. In comparison to the generic state of the art with a meandering flow of the cooling medium through the cooling element, a lower pressure loss can also be expected.
  • Another advantage is that the pipe surface exposed to direct heat radiation from the furnace in relation to the entire surface of the cooling element is reduced to approximately half the pipe surface of a generic wall element because of the arrangement in the outside of the pipe Pipe row standing pipes are protected and shielded by the slag gusset in front of them.
  • the repair effort for the wall element according to the invention is significantly reduced, because the pipes standing in the outer row of pipes are hardly exposed to thermal or mechanical stress, so that only the pipes standing in the inner row of pipes may require repair / replacement .
  • the tubes of the inner row of tubes and the tubes of the outer row of tubes each have their own central manifold.
  • the cooling medium supply can be controlled so that the inner and outer rows of tubes are acted on separately;
  • the inner and outer row of pipes can also be connected via the separate manifolds so that the pipes first flows through the inner row of pipes and then the already heated cooling medium is still used to cool the pipes of the outer row of pipes.
  • the tubes of the inner row of tubes and the outer row of tubes can be arranged both horizontally and vertically.
  • each individual tube in the inner as well as in the outer row of tubes consists of an outer standing tube and an inner tube arranged therein with the formation of an annular space, wherein according to one embodiment of the invention the inner tube also an approach can protrude into the associated manifold.
  • the extension of the inner tube forms an entry surface for the cooling medium which is inclined to the direction of flow of the cooling medium in the collecting line, so that the circulation of the cooling medium is supported in each individual tube.
  • the inner tube is arranged eccentrically in the standing tube with a greater distance from the inside of the furnace, because this increases the cooling effect of the part of the outer surface of the standing tube exposed to heat radiation.
  • the sheets arranged between the tubes of the inner and outer row of tubes can be provided with holders protruding into the gusset, as is known in principle from DE 35 07 182 A1; this further improves the adhesion of a slag jacket in the gusset enclosed by the sheets or tubes.
  • the sheets arranged between the individual tubes are made of copper, which is associated with good dissipation of this heat to the cooled tubes in the case of high local heat flow densities.
  • the outer jackets of the tubes can also be provided with a copper coating in order to improve heat dissipation or transmission, this measure being known in principle from the generic DE 38 20 448 A1.
  • cooling medium circuit is a cooling medium supply line, the collecting line for the to switch the inner row of pipes, the manifold for the outer row of pipes and a coolant discharge line according to the direction of flow of the coolant, so that the coolant is initially supplied to the region which is mostly thermally loaded.
  • a wall element is constructed from two rows of tubes 10 through which cooling water flows and which are arranged at different distances from the center of the furnace, with an inner row of tubes 11 and an outer row of tubes 12.
  • the tubes 10 are arranged at a distance from one another, the outer Row of tubes 12 with their associated tubes 10 is offset from the inner row of tubes 11 in such a way that the tubes 10 of the outer row of tubes 12 are located between the tubes 10 of the inner row of tubes 11.
  • the tubes 10 are the inner Row of tubes 11 and tubes 10 of the outer row of tubes 12 are each connected to one another via sheets 13 in such a way that a jagged arrangement of the sheets 13 results over the longitudinal extent of the wall element.
  • the tubes 10 in the tube rows 11, 12 are arranged in a standing, that is to say vertical, course and are connected at their respective upper ends to their own central collecting line (claim 2).
  • the tubes 10 of the inner row of tubes 11 have a greater height and reach a manifold 15 connecting them, while the tubes 10 of the outer row of tubes 12 are connected to a lower-lying manifold 16.
  • the two manifolds 15, 16 are consequently both offset in height and laterally from one another and connected to one another via corresponding deflecting elements 17, 18 so that the cooling water supplied via a cooling water supply line 24 firstly via the manifold 15 and the connected pipes 10 of the inner one Row of tubes 11 and then flows via the deflection element 18 into the manifold 16 and into the tubes 10 of the outer row of tubes 12 connected thereto until the cooling water flows out via an associated discharge line 25.
  • each individual tube 10 consists of an outer upright tube 19 and an inner tube 20 inserted therein to form an annular space, the inner tube being at a distance from the bottom of the Upright pipe 19 is arranged and projects with an upper attachment 21 into the associated manifold 15 or 16, the attachment 21 forming, for example, an inclined surface 22 inclined to the flow direction of the cooling water in the associated manifold.
  • the flow pattern is indicated by the arrows 23 (FIG. 2), after which the cooling water supplied via the supply line 24 initially flows via the deflection element 17 to the upper manifold 15, to which the standpipes 19 of the inner row of pipes 11 are connected.
  • a part of the cooling water flow flowing in the manifold 15 enters the inner tube 20 of each standing tube 19 via the inclined surface 22, falls here to the lower end and rises in the annular space between the interior 20 and the standing tube 19, due to the the jacket of the upright tube 19 acting heat flow is heated and causes a natural buoyancy.
  • the current rising in the annular space is combined with the cooling water flow in the upper header 15.
  • the cooling water is conducted via the deflecting element 18 into the lower header 16 arranged in the plane of the outer row of tubes 12 and flows through it to the manifold 16 connected pipes 10 according to the same principle as described above.
  • the cooling water is led away via the associated discharge line 25.
  • all individual tubes 10 of both the inner tube row 11 and the outer tube row 12 are connected to a single central manifold 30 at the same height, with regard to the design of the individual tubes 10 and their connection to the manifold 30 previously described Features can be implemented accordingly.
  • the cooling medium thus flows between the connecting pieces 32, 33 via the distribution pipe 31 and the manifold 30 and flows from here through the individual pipes 10 of the two rows of pipes 11, 12 connected to the manifold 30, as described for the exemplary embodiment according to FIGS. 1 to 3.
  • a cooling element with the features specified in the claims can be used not only in metallurgical furnaces, but also with the same advantages in furnace furnaces, converter hoods, combustion plants, etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
EP93111098A 1992-07-14 1993-07-12 Gekühltes Wandelement für metallurgische Öfen Withdrawn EP0579146A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4223109 1992-07-14
DE19924223109 DE4223109C1 (enrdf_load_stackoverflow) 1992-07-14 1992-07-14

Publications (1)

Publication Number Publication Date
EP0579146A1 true EP0579146A1 (de) 1994-01-19

Family

ID=6463167

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93111098A Withdrawn EP0579146A1 (de) 1992-07-14 1993-07-12 Gekühltes Wandelement für metallurgische Öfen

Country Status (2)

Country Link
EP (1) EP0579146A1 (enrdf_load_stackoverflow)
DE (1) DE4223109C1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1288850B1 (it) * 1996-02-14 1998-09-25 Danieli Off Mecc Dispositvo di raffreddamento a pannelli laterali per forno elettrico
IT1288891B1 (it) * 1996-04-30 1998-09-25 Danieli Off Mecc Sistema di raffreddamento della volta per forni elettrici ad arco
US6059028A (en) * 1997-03-07 2000-05-09 Amerifab, Inc. Continuously operating liquid-cooled panel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB316534A (en) * 1928-04-30 1929-07-30 Babcock & Wilcox Ltd Improvements in water cooled walls of furnaces
FR2336648A1 (fr) * 1975-12-24 1977-07-22 Sofresid Plaque de refroidissement pour fours a cuves, notamment pour hauts-fourneaux
EP0065330A1 (de) * 1981-05-20 1982-11-24 BBC Aktiengesellschaft Brown, Boveri & Cie. Flüssigkeitskühlvorrichtung für Industrieöfen
EP0140401A1 (en) * 1983-09-19 1985-05-08 IMPIANTI INDUSTRIALI Spa Cooled panel for furnaces
FR2663868A1 (fr) * 1990-02-07 1992-01-03 Wurth Paul Sa Hotte a parois refroidies.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2937038A1 (de) * 1979-09-13 1981-04-02 Heinz Dipl.-Ing. 4330 Mülheim Westerhoff Kuehlelement fuer industrieoefen
DE3507182A1 (de) * 1985-03-01 1986-09-04 MAN Gutehoffnungshütte GmbH, 4200 Oberhausen Schmelzgefaess, insbesondere lichtbogenofen
DE3820448A1 (de) * 1988-06-16 1989-12-21 Thyssen Edelstahlwerke Ag Gekuehltes wandelement fuer metallurgische oefen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB316534A (en) * 1928-04-30 1929-07-30 Babcock & Wilcox Ltd Improvements in water cooled walls of furnaces
FR2336648A1 (fr) * 1975-12-24 1977-07-22 Sofresid Plaque de refroidissement pour fours a cuves, notamment pour hauts-fourneaux
EP0065330A1 (de) * 1981-05-20 1982-11-24 BBC Aktiengesellschaft Brown, Boveri & Cie. Flüssigkeitskühlvorrichtung für Industrieöfen
EP0140401A1 (en) * 1983-09-19 1985-05-08 IMPIANTI INDUSTRIALI Spa Cooled panel for furnaces
FR2663868A1 (fr) * 1990-02-07 1992-01-03 Wurth Paul Sa Hotte a parois refroidies.

Also Published As

Publication number Publication date
DE4223109C1 (enrdf_load_stackoverflow) 1993-09-16

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