EP0350356A1 - Ofenoberschwelle - Google Patents

Ofenoberschwelle Download PDF

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Publication number
EP0350356A1
EP0350356A1 EP19890401731 EP89401731A EP0350356A1 EP 0350356 A1 EP0350356 A1 EP 0350356A1 EP 19890401731 EP19890401731 EP 19890401731 EP 89401731 A EP89401731 A EP 89401731A EP 0350356 A1 EP0350356 A1 EP 0350356A1
Authority
EP
European Patent Office
Prior art keywords
tubes
lintel
oven
heat transfer
transfer fluid
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Withdrawn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
EP19890401731
Other languages
English (en)
French (fr)
Inventor
Jean Varnoux
Gérard Godet
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.)
Fives Stein SA
Original Assignee
Stein Heurtey 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 Stein Heurtey SA filed Critical Stein Heurtey SA
Publication of EP0350356A1 publication Critical patent/EP0350356A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/0041—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for only one medium being tubes having parts touching each other or tubes assembled in panel form
    • 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
    • F27D1/1866—Door-frames
    • 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

Definitions

  • the present invention relates to an oven lintel in particular for metallurgical heat treatments.
  • ovens comprising a cooled lintel.
  • oven lintels produced up to now pose problems with regard to the behavior over time depending on the regimes.
  • the controlled cooling solutions of the lintels usually used call for either an air sweep of the lintel made up of hollow beam or an organized circulation of water inside this same hollow beam; water can either fill the entire cavity thus formed or circulate in tubes themselves embedded in insulating materials.
  • Publication DE-A-1027704 describes a beam of the type mentioned above, in which a refrigerant circulates, this beam being constituted by a supporting frame of very thick sheets, on which are fixed tubes traversed by the refrigerating agent.
  • the beam described in this publication applies to heating installations and it makes it possible, to a certain extent, to solve the problems of resistance to high temperatures on the one hand and to significant mechanical forces on the other hand, which one encountered in such facilities.
  • these beams of known type do not make it possible to solve the problems mentioned above, resulting from the overheating of the metal parts and from their corrosion.
  • this invention proposes to provide a solution to these problems.
  • an oven lintel of the type consisting of a hollow box provided with tubes in which a heat transfer fluid circulates, characterized in that the walls of said box consist of the tubes in which the heat transfer fluid flows and by welded flat irons on the tubes and intersecting the latter, and in that the protection of said walls against radiation and convection of smoke from the oven is obtained by a refractory lining maintained by a metal frame on which the flat spacers are fixed.
  • the oven lintel object of the present invention, it is possible to maintain a homogeneous temperature at a predetermined level whatever the state of the materials, insulating or refractory, which protect the lintel from radiation and from convection of the oven atmosphere.
  • the inertia of the hollow box which constitutes the lintel according to the invention is equivalent to or even greater than that of a conventional lintel made of sheets and profiles while being of a lower weight.
  • the temperature of the walls of the box is controlled by the speed and the pressure of circulation of the heat transfer fluid inside the tubes of the box.
  • the heat transfer fluid can be either water or a mixed water / vapor phase.
  • the transfer coefficients between heat transfer fluid and tubes are very much greater than the transfer coefficients between the lining and the walls of the box or even, in the event of partial destruction of these linings, between the enclosure and the wall, the temperature of the latter is imposed by the conditions of temperature and speed of the heat transfer fluid, the thickness of the tubes and flat braced bars as well as the method of welding the dishes on the tubes; the temperature of the water coolant or mixed water / vapor phase is itself linked to the recirculation rate and to the pressure of the lintel supply loop.
  • this lintel 3 is produced in the form of a hollow box whose walls consist of tubes 4 connected by spacers produced in the form of flat bars such as 5, welded to the tubes 4. using conventional means (not shown in the drawing) a heat transfer fluid is circulated inside the tubes 4 so as to cool the lintel.
  • This heat transfer fluid can be water or a water / vapor phase.
  • the tubes 4 are connected in series, the entry of the heat transfer fluid being effected by the tubes located at the lower part of the lintel.
  • the tubes 4 are connected in parallel, the entry of the heat transfer fluid is effected by the tubes which are located at the bottom of the lintel.
  • the tubes 4 can be simple tubes with direct passage of the heat-transfer fluid as illustrated by FIGS. 1 to 3, or else they can be produced in the form of double, concentric tubes 4a, 4b as illustrated by FIG. 4, this variant being provided more particularly in the event of significant calorific intake.
  • the heat transfer fluid can penetrate through the internal tubes 4b and exit through the external tubes 4a, as illustrated in FIG. 4 or vice versa.
  • the lintel is held using upper 9 and lower 10 supports and it is protected from radiation and convection of hot smoke by a refractory lining such as 6, 7 held in place using a metal frame 8.
  • the invention makes it possible to achieve controlled cooling of the lintel, the temperature of the walls of the latter being able to be controlled by the speed and the pressure of circulation of the heat transfer fluid inside the tubes. box, by setting the equilibrium temperature of these walls to a value higher than the acid dew point of the fumes from the oven and lower than the temperature at which the metal constituting the walls of the box loses its mechanical characteristics.
  • the invention makes it possible to check at any time the state of the cooled lintel described above by controlling the flow rate, the pressure and the temperature of the hot water or of the steam produced by the lintel, during cooling, in order to to know at all times the heat flow between the oven and its lintel and to deduce the state of the latter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP19890401731 1988-07-05 1989-06-19 Ofenoberschwelle Withdrawn EP0350356A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8809699A FR2634009B1 (fr) 1988-07-05 1988-07-05 Linteau pour ouverture de four
FR8809699 1988-07-05

Publications (1)

Publication Number Publication Date
EP0350356A1 true EP0350356A1 (de) 1990-01-10

Family

ID=9368515

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890401731 Withdrawn EP0350356A1 (de) 1988-07-05 1989-06-19 Ofenoberschwelle

Country Status (5)

Country Link
EP (1) EP0350356A1 (de)
DE (1) DE350356T1 (de)
ES (1) ES2012443A4 (de)
FR (1) FR2634009B1 (de)
GR (1) GR900300033T1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614545A (en) * 1949-12-30 1952-10-21 Harry F Nulph Water-cooled lintel and skewback channel cooler
DE1027704B (de) * 1955-01-07 1958-04-10 Mont Kessel Herpen & Co Komman Kuehlbalken fuer Feuerungs- und Ofenanlagen
DE1116253B (de) * 1956-09-14 1961-11-02 Babcock & Wilcox Dampfkessel Hochdruck-Tuerkuehlrahmen
GB900990A (en) * 1957-05-18 1962-07-11 Vorkauf Heinrich Improvements in and relating to cooled door frames for siemens-martin open-hearth furnaces or the like
GB2009898A (en) * 1977-12-06 1979-06-20 Sanyo Special Steel Co Ltd Water-cooled panel for use in an electric furnace

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614545A (en) * 1949-12-30 1952-10-21 Harry F Nulph Water-cooled lintel and skewback channel cooler
DE1027704B (de) * 1955-01-07 1958-04-10 Mont Kessel Herpen & Co Komman Kuehlbalken fuer Feuerungs- und Ofenanlagen
DE1116253B (de) * 1956-09-14 1961-11-02 Babcock & Wilcox Dampfkessel Hochdruck-Tuerkuehlrahmen
GB900990A (en) * 1957-05-18 1962-07-11 Vorkauf Heinrich Improvements in and relating to cooled door frames for siemens-martin open-hearth furnaces or the like
GB2009898A (en) * 1977-12-06 1979-06-20 Sanyo Special Steel Co Ltd Water-cooled panel for use in an electric furnace

Also Published As

Publication number Publication date
ES2012443A4 (es) 1990-04-01
GR900300033T1 (en) 1991-07-31
FR2634009B1 (fr) 1993-09-17
DE350356T1 (de) 1990-05-23
FR2634009A1 (fr) 1990-01-12

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