EP1992896A1 - Ringofen mit Rauchgaskanalausmauerung mit eingebauten Dehnungsverbindungen - Google Patents

Ringofen mit Rauchgaskanalausmauerung mit eingebauten Dehnungsverbindungen Download PDF

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Publication number
EP1992896A1
EP1992896A1 EP07356066A EP07356066A EP1992896A1 EP 1992896 A1 EP1992896 A1 EP 1992896A1 EP 07356066 A EP07356066 A EP 07356066A EP 07356066 A EP07356066 A EP 07356066A EP 1992896 A1 EP1992896 A1 EP 1992896A1
Authority
EP
European Patent Office
Prior art keywords
bricks
gap
transverse
hollow
ring 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.)
Withdrawn
Application number
EP07356066A
Other languages
English (en)
French (fr)
Inventor
Christian Joinville
Pierre-Jean Roy
Yannick Drouet
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 Alcan International Ltd
Original Assignee
Alcan International Ltd Canada
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 Alcan International Ltd Canada filed Critical Alcan International Ltd Canada
Priority to EP07356066A priority Critical patent/EP1992896A1/de
Publication of EP1992896A1 publication Critical patent/EP1992896A1/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Withdrawn legal-status Critical Current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
    • 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
    • F27B13/10—Arrangements of linings
    • 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
    • F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used

Definitions

  • the invention relates to ring furnaces for baking carbonaceous articles, especially open type ring furnaces.
  • the invention relates more specifically to the internal structure of ring furnaces.
  • Open type ring furnaces comprise series of baking pits that are delimited by hollow partitions, often called flue walls, and transverse walls.
  • the partitions and walls are made of refractory bricks, such as those described in International Applications Nos. WO 95/22666 and WO 97/35150 .
  • the baking pits are designed to receive green carbonaceous articles and packing material therein during the baking operations.
  • the hollow partitions are intended for the circulation of heating flue and cooling gas during the baking operations.
  • the transverse walls partition the furnace into a plurality of separate firing sections.
  • Groups of successive sections are simultaneously utilized to make up a baking sequence for a batch of carbonaceous articles.
  • heating equipment is installed at a specific location of groups of sections while exhaust equipment is installed downstream of the heating means and blowing equipment is installed upstream of the same. After completion of a firing operation, all pieces of equipment are shifted downstream by a specified number of sections.
  • the expansion joints at the junction between the hollow partitions and the transversal walls comprise indentations in the transversal walls in which the hollow partitions are inserted with both longitudinal and transversal clearance.
  • the clearance enables the hollow partitions to move longitudinally within the indentations when they thermally expand or contract during a baking process.
  • These joints are filled with a compressible refractory material in order to make them impervious and prevent the packing material contained in the pits to pass through them during the firing of the carbonaceous blocks.
  • indented expansion joints require a permanent supply of compressible material and the handling of the same on industrial plants.
  • imperviousness of such indented expansion joints most often deteriorate over time, so that packing material may enter the junction between the hollow partitions and the transversal walls and thereby hinder the expansion movement of the hollow partitions.
  • a first object of the invention is a ring furnace having a longitudinal axis X-X' and comprising a first elongated bay and a second elongated bay, each bay being parallel to said axis and including a casing, a plurality of hollow partitions arranged within said casing of each bay so as to be parallel to said axis, a first end transverse wall located at a first end of each bay, a second end transverse wall located at a second end of each bay and a plurality of intermediate transverse walls located between said first and second ends, said transverse walls being arranged so as to be perpendicular to said axis, said hollow partitions and transverse walls defining baking pits within said bays for stacking carbonaceous articles therein, said hollow partitions having lateral walls comprising bricks, wherein, so as to allow thermal expansion of said bricks while preserving the transverse imperviousness of said hollow partitions, at least one of said hollow partitions includes at least one gap between specified bricks in each said lateral wall and
  • Said gap and sealing bricks form a sealed, built-in expansion joint that makes it possible to allow large thermal expansion of the hollow partitions while maintaining the cohesion and imperviousness of said partitions.
  • the built-in expansion joints make it possible to avoid the need for expansion joints between the hollow partitions and the transverse walls.
  • the junctions between the hollow partitions and the transverse walls may be made tight, for example by providing indentations so dimensioned that the hollow partitions can snugly fit therein without clearance and compressible material between the same.
  • Said ring furnace is particularly intended for the baking of carbonaceous anodes designed for use in electrolysis cells intended for the production of aluminium through the Hall-Héroult process.
  • Said pillars (113, 114) are typically made of at least one vertical stack of bricks that preferably includes transverse bricks (1111, 1121) that fit into the lateral walls (11, 11') of said hollow partitions (3, 3') so as to stabilize the same.
  • Said pillars (113, 114) typically also include inner bricks (1112, 1122) that are adjacent said lateral walls (11, 11'), and more specifically adjoin wall bricks (1101).
  • a hollow partition has a top (130), a bottom (131) and a height H and includes at least one first vertical gap (111) running from said bottom (131) to a specified height H1, at least one second vertical gap (112) longitudinally shifted, having a length H2 and running from height H1 to said top (130), a sliding plane (115) located at height H1, between said first and second gaps, at the interface between a first horizontal row of sliding bricks (1151) and a second horizontal row of sliding bricks (1152), at least one first vertical pillar (113) running from said bottom (131) to a specified height H1, and at least one second vertical pillar (114) longitudinally shifted, having a length H2 and running from height H1 to said top (130).
  • Said sliding plane (115) that joins said gaps (111, 112) has width W and allows relative longitudinal displacement of a first part (11A, 11A') of said lateral walls (11, 11') that lie on one side of said gaps (111, 112) and a second part (11B, 11B') of said lateral walls (11, 11') that lie on the other side thereof longitudinally.
  • Said width W is typically comprised between 800 mm and 1500 mm.
  • Said sliding bricks (1151, 1152) advantageously comprise at least one longitudinal projection and/or at least one longitudinal recess on an upper or lower surface of said sliding bricks, such as the tongues (118) illustrated in Figure 5(C) , to allow relative longitudinal displacements of said sliding bricks while avoiding relative transverse displacements of the same, in order to stabilize their position transversally while allowing longitudinal sliding as a result of thermal expansion.
  • all bricks may be assembled using mortar or grout, except within said gaps (111, 112) and sliding plane (115).
  • the shift between said vertical pillars (113, 114) creates a passage for flue gases and air within the partition while allowing thermal expansion.
  • each hollow partition (3, 3') includes at least one built-in expansion joint.
  • each of said hollow partitions (3, 3') preferably includes said at least one gap (111, 112) between specified bricks in each said lateral wall (11, 11') and said sealing bricks (1111, 1112, 1121, 1122) arranged within said hollow partition so as to overlap said gap (111, 112) and thereby seal the same.
  • Said hollow partitions (3, 3') may further include tie bricks (8) and/or baffles (9) to direct the flow of flue gas.
  • Said hollow partitions (3, 3') typically further include upper blocks or caps (19A) that bridge said lateral walls (11, 11').

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP07356066A 2007-05-14 2007-05-14 Ringofen mit Rauchgaskanalausmauerung mit eingebauten Dehnungsverbindungen Withdrawn EP1992896A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07356066A EP1992896A1 (de) 2007-05-14 2007-05-14 Ringofen mit Rauchgaskanalausmauerung mit eingebauten Dehnungsverbindungen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07356066A EP1992896A1 (de) 2007-05-14 2007-05-14 Ringofen mit Rauchgaskanalausmauerung mit eingebauten Dehnungsverbindungen

Publications (1)

Publication Number Publication Date
EP1992896A1 true EP1992896A1 (de) 2008-11-19

Family

ID=38510417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07356066A Withdrawn EP1992896A1 (de) 2007-05-14 2007-05-14 Ringofen mit Rauchgaskanalausmauerung mit eingebauten Dehnungsverbindungen

Country Status (1)

Country Link
EP (1) EP1992896A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE592117C (de) * 1923-01-05 1934-02-01 Koppers Co Inc Koksofenbatterie mit stehender Kammer
US4059885A (en) * 1975-03-19 1977-11-29 Dr. C. Otto & Comp. G.M.B.H. Process for partial restoration of a coke oven battery
US5683631A (en) * 1995-09-11 1997-11-04 Zabreznik; Rodney D. Carbonaceous packing material for prebaked anode maufacture in open pit ring furnaces
WO2007006962A2 (fr) * 2005-07-12 2007-01-18 Aluminium Pechiney Four a chambres avec des joints de dilatation ameliores et briques destinees a sa realisation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE592117C (de) * 1923-01-05 1934-02-01 Koppers Co Inc Koksofenbatterie mit stehender Kammer
US4059885A (en) * 1975-03-19 1977-11-29 Dr. C. Otto & Comp. G.M.B.H. Process for partial restoration of a coke oven battery
US5683631A (en) * 1995-09-11 1997-11-04 Zabreznik; Rodney D. Carbonaceous packing material for prebaked anode maufacture in open pit ring furnaces
WO2007006962A2 (fr) * 2005-07-12 2007-01-18 Aluminium Pechiney Four a chambres avec des joints de dilatation ameliores et briques destinees a sa realisation

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