EP0336864A1 - Konstruktionsverfahren für einen Ofen mit offenen Kammern zum Vermeiden von Formveränderungen - Google Patents

Konstruktionsverfahren für einen Ofen mit offenen Kammern zum Vermeiden von Formveränderungen Download PDF

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Publication number
EP0336864A1
EP0336864A1 EP89420130A EP89420130A EP0336864A1 EP 0336864 A1 EP0336864 A1 EP 0336864A1 EP 89420130 A EP89420130 A EP 89420130A EP 89420130 A EP89420130 A EP 89420130A EP 0336864 A1 EP0336864 A1 EP 0336864A1
Authority
EP
European Patent Office
Prior art keywords
prestressing
chambers
concrete
oven
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
EP89420130A
Other languages
English (en)
French (fr)
Other versions
EP0336864B1 (de
Inventor
Aristide Valassopoulos
Jean-Claude Thomas
Christian Dreyer
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.)
Rio Tinto France SAS
Original Assignee
Aluminium Pechiney SA
Pechiney 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 Aluminium Pechiney SA, Pechiney SA filed Critical Aluminium Pechiney SA
Publication of EP0336864A1 publication Critical patent/EP0336864A1/de
Application granted granted Critical
Publication of EP0336864B1 publication Critical patent/EP0336864B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type, of type in which segmental kiln moves over stationary charge
    • F27B13/06—Details, accessories, or equipment peculiar to furnaces of this type
    • 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
    • F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type, of type in which segmental kiln moves over stationary charge
    • F27B13/06—Details, accessories, or equipment peculiar to furnaces of this type
    • F27B13/08—Casings
    • 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

Definitions

  • the invention relates to a method of constructing ovens with open chambers, also called “rotary fire ovens” or “fire advancement ovens” mainly intended for cooking carbon anodes for the production of aluminum by electrolysis according to the Hall process. -Héroult.
  • This type of furnace generally comprises two parallel spans, the total length of which can reach nearly two hundred meters.
  • Each span comprises a succession of chambers, separated by transverse walls and open at their upper part to allow the loading of raw anodes (or other carbonaceous blocks) and the unloading of cooled cooked anodes.
  • Each chamber comprises, arranged parallel to the major axis of the oven, a set of hollow partitions, with relatively thin walls in which the hot gases ensuring cooking will circulate, these partitions alternating with cells in which the baking anodes which are embedded are stacked. in carbonaceous dust (coke, anthracite, or any other powdery packing material).
  • carbonaceous dust coke, anthracite, or any other powdery packing material
  • the chambers of a span are contained in a concrete casing formed by a horizontal raft and two vertical sails.
  • the concrete is protected from temperature, inside, by thermal insulation.
  • the entire oven is housed in a building supporting the rolling tracks of handling equipment.
  • the ovens are buried or semi-buried, which simplifies operation, handling and reduces investment costs.
  • Concrete casing walls are subjected to three types of force: - horizontal thrust on the sails by the refractory which constitutes the chambers, from the inside to the outside.
  • the object of the invention is therefore a method of constructing the concrete casing of a chamber furnace which very greatly reduces the deformations due to the differential thermal expansion between the various elements of the furnace and to the thrusts of all kinds which are exerted on the walls.
  • the invention consists of a method of constructing an oven with open chambers intended for cooking carbonaceous blocks, this oven consisting of a plurality of chambers arranged in series on one or two parallel spans, each chamber being contained in a concrete casing formed by a raft and concrete side sails, characterized in that there is on the external face of each sail a plurality of vertical buttresses which are put under prestress in the direction vertical.
  • the prestressing is applied by means of at least one fixed steel cable, at the two ends on a metal plate coming to bear at the base and at the top of each buttress.
  • the upper part of the transverse walls which separate the different chambers of the oven is held in place with a tie rod on which an adjustable tension is applied between 0 and 200 kN.
  • FIG. 1 we see the partitions 1 connected at their upper part, by nozzles 2, to the pipe 3 itself connected to the general manifold 4.
  • the suction and blowing pipes are connected to the ports of the chambers according to our FR patent 2,535,834.
  • the baffles 7 of the heating partitions are intended to lengthen the path of the hot gases and to homogenize the temperature in the partition.
  • the openers 8 allow the installation, in correlation with the advancement of the fire, of the blowing, suction and burner pipes.
  • the successive chambers are separated by transverse walls 9.
  • the successive partitions of the various chambers are brought into communication by openings 10, located at the upper part of the transverse wall.
  • the main axis of the furnace is indicated by the line XX ′.
  • Figure 2 which is a very simplified cross section, we has shown, in thickened lines, the concrete webs 11 which constitute the framework of the furnace, which is supported by a raft 12 resting on piles 13, the depth of which depends on the nature of the terrain T.
  • the prestressing is carried out by insertion over the entire height of the buttress, of prestressing cables 15, coated with a protective sheath 16, injected after tensioning the cables, and bolted at their two ends on plates 17, which are supported on the upper and lower ends of each buttress 14.
  • a shutter device installed inside the partition such as for example the deployable shutter which is the subject of our French patent application 87-08564, filed on June 9, 1987, it is then possible to remove the transverse wall outlet 10 A and to achieve communication between the rooms by an opening 10 A, which no longer constitutes a weak point of the wall, and which can be closed thanks to the deployable shutter introduced by the opening 8A closest to the corresponding partition.
  • the deployable shutter introduced by the opening 8A closest to the corresponding partition.
  • FIG. 6 it becomes possible to energize the upper part of the wall 9, by means of at least one tie rod 21 arranged horizontally, and anchored on two steel plates 22 placed in abutment on the two ends of the wall 9.
  • the tension is adjustable between 0 and 200 kN by spring and / or "Belleville" washer, or any other equivalent means.
  • the invention was implemented during the reconstruction of an oven with rooms with two parallel spans, with a total width of 25 meters.
  • the side sails 11 have a height of 5 meters, a length of 10 meters and are reinforced by 5 buttresses put under prestressing as shown in FIG. 5 by means of two steel cables surrounded by a metal protective sheath.
  • the prestressing force applied was fixed at 600 kN by cable.
  • the upper part of the transverse walls has been tensioned by means of a metal tie 21 adjusted so that the maximum force exerted during the passage of the fire is equal to 140 kN. After one year of uninterrupted operation, it was found that the maximum range of movement of the veil in the upper part during the passage of the light did not exceed 25 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Baking, Grill, Roasting (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Electric Stoves And Ranges (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP89420130A 1988-04-08 1989-04-06 Konstruktionsverfahren für einen Ofen mit offenen Kammern zum Vermeiden von Formveränderungen Expired - Lifetime EP0336864B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8805251A FR2629906B1 (fr) 1988-04-08 1988-04-08 Procede de construction de fours a chambres ouvertes permettant d'eviter leur deformation
FR8805251 1988-04-08

Publications (2)

Publication Number Publication Date
EP0336864A1 true EP0336864A1 (de) 1989-10-11
EP0336864B1 EP0336864B1 (de) 1992-01-22

Family

ID=9365505

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89420130A Expired - Lifetime EP0336864B1 (de) 1988-04-08 1989-04-06 Konstruktionsverfahren für einen Ofen mit offenen Kammern zum Vermeiden von Formveränderungen

Country Status (7)

Country Link
US (1) US4957428A (de)
EP (1) EP0336864B1 (de)
AU (1) AU609961B2 (de)
CA (1) CA1333750C (de)
DE (1) DE68900741D1 (de)
FR (1) FR2629906B1 (de)
NO (1) NO170363C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1733060A1 (de) * 2003-11-26 2006-12-20 Pyrotek, Inc. Metallschrotteintauchvorrichtung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2779811B1 (fr) * 1998-06-11 2000-07-28 Pechiney Aluminium Four a feu tournant a flux central tubulaire
CN102435071B (zh) * 2011-11-14 2015-12-09 王国强 焙烧炉变形火道墙的校正方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR926836A (fr) * 1946-05-13 1947-10-13 Four à briques
GB801943A (en) * 1956-04-25 1958-09-24 Edward David Bacheler Russell Improvements in or relating to kilns for firing articles consisting of clay or brick earth or the like
GB827896A (en) * 1957-06-21 1960-02-10 Edward David Bacheler Russell Improvements in or relating to kilns for firing articles consisting of clay or brick-earth or the like

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR926836A (fr) * 1946-05-13 1947-10-13 Four à briques
GB801943A (en) * 1956-04-25 1958-09-24 Edward David Bacheler Russell Improvements in or relating to kilns for firing articles consisting of clay or brick earth or the like
GB827896A (en) * 1957-06-21 1960-02-10 Edward David Bacheler Russell Improvements in or relating to kilns for firing articles consisting of clay or brick-earth or the like

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1733060A1 (de) * 2003-11-26 2006-12-20 Pyrotek, Inc. Metallschrotteintauchvorrichtung
EP1733060A4 (de) * 2003-11-26 2007-04-25 Pyrotek Inc Metallschrotteintauchvorrichtung

Also Published As

Publication number Publication date
FR2629906B1 (fr) 1991-02-08
DE68900741D1 (de) 1992-03-05
NO170363B (no) 1992-06-29
CA1333750C (fr) 1995-01-03
NO170363C (no) 1992-10-07
AU609961B2 (en) 1991-05-09
AU3243389A (en) 1989-10-12
US4957428A (en) 1990-09-18
NO891324D0 (no) 1989-03-29
EP0336864B1 (de) 1992-01-22
NO891324L (no) 1989-10-09
FR2629906A1 (fr) 1989-10-13

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