US3624733A - Suspended roof for high-temperature industrial furnaces - Google Patents

Suspended roof for high-temperature industrial furnaces Download PDF

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Publication number
US3624733A
US3624733A US18679A US3624733DA US3624733A US 3624733 A US3624733 A US 3624733A US 18679 A US18679 A US 18679A US 3624733D A US3624733D A US 3624733DA US 3624733 A US3624733 A US 3624733A
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United States
Prior art keywords
blocks
roof structure
facing
facing blocks
roof
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Expired - Lifetime
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US18679A
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English (en)
Inventor
George Patrick Eadie
William Halliday
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Laidlaw Drew and Co Ltd
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Laidlaw Drew and Co Ltd
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Publication date
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/42—Details of construction of furnace walls, e.g. to prevent corrosion; Use of materials for furnace walls
    • 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
    • F27D1/02—Crowns; Roofs
    • F27D1/021—Suspended roofs

Definitions

  • a roof structure primarily for a regenerative glass furnace comprising a plurality of monolithic facing blocks suspended from a support structure via ceramic anchor tiles formed integral with said facing blocks, said facing blocks being backed up by high and low temperature layers of insu lating material. Expansion gaps are provided between said facing blocks and these are closed by filler tiles positioned in one of said indulation layers.
  • SHEET 8 BF 6 SUSPENDED ROOF FOR HIGH-TEMPERATURE INDUSTRIAL FURNACES This invention relates to a suspended roof for high temperature industrial furnaces.
  • a roof for a high-temperature industrial furnace comprising a plurality of monolithic facing blocks of a refractory material disposed side-by-side over the area of the furnace chamber, and means for suspending said blocks individually from a supporting framework, said blocks being backed up by hightemperature and low-temperature layers of insulating material whereby, in use, the heat losses from furnace are kept to a minimum.
  • the facing blocks are suspended from a steelwork support structure by hanger bolts which engage holes formed in ceramic anchor tiles attached to, or fonned integral with, the facing blocks.
  • FIG. I is a cross section through a known type of glass furnace
  • FIG. 2 is a longitudinal section through a furnace according to the present invention
  • FIG. 3 is a part section on the line 33 of FIG. 2,
  • FIG. 4 is a part section on the line 44 of FIG. 2,
  • FIG. 5 is an enlarged section of part of FIG. 4,
  • FIG. 6 is a part section on the line 6-6 of FIG. 5,
  • FIG. 7 is an enlarged section of part of FIG. 3,
  • FIG. 8 is a detail showing a modification of FIG. 7,
  • FIG. 9 is an elevation, on an enlarged scale, of an anchor tile.
  • FIG. 10 is a side elevation corresponding to FIG. 9.
  • FIG. 1 of the drawings there is shown a standard type of glass furnace which consists of furnace chamber 11 having combustion air ports 12 and a solid arcuate roof 13. It has been found that, particularly in larger melting unit, the geometry of solid arcuate roofs is not compatible with the geometry required to obtain good combustion conditions within the furnace. This results in furnaces provided with arcuate roofs having, either high refractory wear rates, or lower outputs that would normally be expected. Furthermore, in these known glass furnaces, difficulties are experienced in varying the heights of the combustion air ports 12 in order to suit the aerodynamic requirements for good combustion within the furnace. This arises out of the fact that the roof height is normally determined by the height of the highest air port and the roof runs at this level throughout the entire length of the furnace.
  • a furnace according to the present invention comprises a base and sidewalls 14, I5 defining a furnace chamber 16, the walls 15 having combustion air ports 17, and the roof being in the form of a suspended structure indicated generally at 18.
  • the roof 18 comprises a plurality of monolithic facing blocks 19 of a refractory material, for example of polymer bonded silica or mullite and/or other materials, or of a bonded silica, mullite and/or other materials.
  • the blocks 19 are preferably but not essentially approximately 30 inch square and are arranged side-by-side with a space, for example of one-quarter of an inch, therebetween to allow the blocks to expand on being heated.
  • the blocks 19 are backed up with a layer 20 of high-temperature insulation material and this layer is in turn backed up with a layer 21 of low-temperature insulation material, the two insulation layers serving to reduce heat losses from the furnace chamber to a minimum.
  • the layers 20, 21 are preferably mullite but other materials could be used.
  • the facing blocks 19 are each provided with two or more anchor tiles 22 which are preferably molded into the block at the time of manufacture. in this respect, as can be seen particularly in FIGS. 9 and 10 of the drawings, one end 23 of the tile is of corrugated formation to provide a key with the block.
  • the blocks 19 are supported individually from a steel framework 24 by means of hook-shaped hanger bolts 25 which engage openings 26 formed in the anchor tiles 22.
  • the framework 24 consists of pairs of steel channels 27 between which the hanger bolts 25 are supported by bearing plates 28, the channels 27 being mounted between main roof supporting beams 29. Intermediate beams 30 may be provided where necessary to assist in shaping of the roof.
  • an expansion gap is provided between adjacent facing blocks 19 and these gaps are closed by filler tiles 31 which span the gaps and are arranged in recesses provided in the high-temperature insulation layer 20.
  • the filler tiles 31 serve to reduce the escape of heat through the expansion gaps. In furnaces where the roof is under high pressure, it may additionally be necessary to provide further sealing of the expansion gaps and this may be efiected by caulking the gaps with ceramic fiber as indicated at 32.
  • the roof structure 18 may be flat or arcuate or, as is shown in the drawings, it may be flat in the center over a major portion of its span and be curved adjacent the ends of its span.
  • the anchor tiles 22 may be disposed perpendicular to the plane of their respective facing blocks 19 as is shown in FIG. 7.
  • the anchor tiles 22 may be arranged obliquely with respect to the plane of their respective facing blocks so that, when in their position of use, the anchor tiles are vertical thereby reducing any bending stresses in the tiles which might otherwise occur.
  • FIGS. 3 and 8 also show one manner in which the curved roof can be fitted to a glass tank port arch block 33.
  • This manner of fitting has the advantage that the distance between the underside of the roof structure 18 and the underside of the arch block 33 can be reduced to, for example 4 inch, as compared with l2 inch which is the usual figure necessary in present day furnace constructions.
  • This further permits, as shown in FIGS. 2, 3 and 4, the combustion air ports 17 to be arranged at different vertical levels to suit combustion requirements without the attendant disadvantages of known furnace constructions.
  • the facing blocks 19 may be formed with an upstanding peripheral flange 34 which extends round the whole of the periphery of the block to present a boxlike structure in which the high-temperature insulation 20 is contained. This has the advantage that it protects the high-temperature insulation against direct attack by furnace vapors.
  • the roof structure of the present invention is of simple and robust construction and, by virtue of the use of large monolithic blocks, is such as to reduce heat losses as compared with known types of suspended roof constructions.
  • it is the normal practice to use small refractory units, roughly the size of a common building brick, each unit having to be individually hung on a separate hanger. This results in a roof which has a very large number of joints which cannot easily be sealed, and a very large number of metal hangers around which it is impossible to fit insulation.
  • the construction of the invention enables the correct roof shape to be provided to satisfy the aerodynamic requirements of the furnace under consideration.
  • a roof structure comprising a supporting framework, a
  • the roof structure as defined in claim 1 including a first backing layer of high-temperature insulating material extending over said facing blocks, and a second backing layer of lowtemperature insulating material extending over said first backing layer.
  • the roof structure as defined in claim 4 including a first backing layer of high-temperature insulating material extending over said facing blocks, and a second backing layer of lowtemperature insulating material extending over said first backing layer.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
US18679A 1969-03-17 1970-03-11 Suspended roof for high-temperature industrial furnaces Expired - Lifetime US3624733A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1385769 1969-03-17

Publications (1)

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US3624733A true US3624733A (en) 1971-11-30

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US18679A Expired - Lifetime US3624733A (en) 1969-03-17 1970-03-11 Suspended roof for high-temperature industrial furnaces

Country Status (4)

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US (1) US3624733A (enrdf_load_stackoverflow)
BE (1) BE747513A (enrdf_load_stackoverflow)
FR (1) FR2035003A1 (enrdf_load_stackoverflow)
GB (1) GB1232744A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4323718A (en) * 1979-06-23 1982-04-06 Hoechst Aktiengesellschaft Arc furnace roof
US4473983A (en) * 1981-03-12 1984-10-02 United States Steel Corporation Anchoring refractory materials to a refractory lining
US20050229502A1 (en) * 2002-11-13 2005-10-20 The Queen's University Of Belfast Concrete arch and method of manufacture
US20060242914A1 (en) * 2005-04-29 2006-11-02 Harbison-Walker Refractories Company Refractory block and refractory wall assembly
USD591778S1 (en) 2005-04-29 2009-05-05 Harbison-Walker Refractories Company Refractory block
US20210024398A1 (en) * 2018-06-21 2021-01-28 Jushi Group Co., Ltd. Glass fiber tank kiln passage crown structure
US20220098079A1 (en) * 2019-08-13 2022-03-31 Jushi Group Co., Ltd. Cover plate structure for glass fiber tank furnace forehearth

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2628519A1 (fr) * 1988-03-14 1989-09-15 Vilia V Bloc de construction, notamment refractaire pour la realisation de voutes suspendues dans le domaine de la thermique industrielle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1686387A (en) * 1927-05-24 1928-10-02 Fred H Loftus Roof and wall construction for open-hearth furnaces
US3045616A (en) * 1959-12-30 1962-07-24 United States Steel Corp Suspended refractory roof
US3132447A (en) * 1961-02-20 1964-05-12 Detrick M H Co Multiple support refractory arch and wall construction
US3161162A (en) * 1961-07-27 1964-12-15 A P Green Fire Brick Company Furnace construction
US3260228A (en) * 1962-11-23 1966-07-12 Lingl Hans Ceiling constructions for furnaces
US3363889A (en) * 1966-07-21 1968-01-16 Loftus Engineering Corp Industrial furnace and oven wall

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1686387A (en) * 1927-05-24 1928-10-02 Fred H Loftus Roof and wall construction for open-hearth furnaces
US3045616A (en) * 1959-12-30 1962-07-24 United States Steel Corp Suspended refractory roof
US3132447A (en) * 1961-02-20 1964-05-12 Detrick M H Co Multiple support refractory arch and wall construction
US3161162A (en) * 1961-07-27 1964-12-15 A P Green Fire Brick Company Furnace construction
US3260228A (en) * 1962-11-23 1966-07-12 Lingl Hans Ceiling constructions for furnaces
US3363889A (en) * 1966-07-21 1968-01-16 Loftus Engineering Corp Industrial furnace and oven wall

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4323718A (en) * 1979-06-23 1982-04-06 Hoechst Aktiengesellschaft Arc furnace roof
US4473983A (en) * 1981-03-12 1984-10-02 United States Steel Corporation Anchoring refractory materials to a refractory lining
US20050229502A1 (en) * 2002-11-13 2005-10-20 The Queen's University Of Belfast Concrete arch and method of manufacture
US7204058B2 (en) * 2002-11-13 2007-04-17 The Queen's University Of Belfast Concrete arch and method of manufacture
US20060242914A1 (en) * 2005-04-29 2006-11-02 Harbison-Walker Refractories Company Refractory block and refractory wall assembly
USD591778S1 (en) 2005-04-29 2009-05-05 Harbison-Walker Refractories Company Refractory block
US20210024398A1 (en) * 2018-06-21 2021-01-28 Jushi Group Co., Ltd. Glass fiber tank kiln passage crown structure
US20220098079A1 (en) * 2019-08-13 2022-03-31 Jushi Group Co., Ltd. Cover plate structure for glass fiber tank furnace forehearth
US12215049B2 (en) * 2019-08-13 2025-02-04 Jushi Group Co., Ltd. Cover plate structure for glass fiber tank furnace forehearth

Also Published As

Publication number Publication date
GB1232744A (enrdf_load_stackoverflow) 1971-05-19
BE747513A (fr) 1970-09-17
FR2035003A1 (enrdf_load_stackoverflow) 1970-12-18

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