US3881864A - Sheathing for metal furnace members - Google Patents

Sheathing for metal furnace members Download PDF

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Publication number
US3881864A
US3881864A US465342A US46534274A US3881864A US 3881864 A US3881864 A US 3881864A US 465342 A US465342 A US 465342A US 46534274 A US46534274 A US 46534274A US 3881864 A US3881864 A US 3881864A
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United States
Prior art keywords
tile
tiles
axial
terminal portion
recess
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Expired - Lifetime
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US465342A
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English (en)
Inventor
Peter John Nicol
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Morgan Refractories Ltd
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Morgan Refractories Ltd
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    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/022—Skids

Definitions

  • the invention comprises a refractory tile for sheathing a furnace skid rail or other horizontal furnace member, preferably around an inner layer of fibrous refractory material.
  • the tile consists of a C-shaped block to embrace one side of the furnace member hooking on at the top and swinging into engagement underneath with a complementary tile.
  • the tile has a lower end terminal portion with oppositely facing axial surfaces so that when two complementary tiles, preferably identical tiles, are interengaged as a collar around a furnace member they hold in position against axial separation.
  • This invention relates to refractory sheathing for horiz ontal metal members in furnaces, such as re-heat furnace skid rails and thier supporting structure, particularly cross-over pipes.
  • the invention is particularly concerned with refractory tilesfor cladding thermal insulation on skid rails and the cross-over pipes which support the rails in reheat furnaces for ferrous slabs and will be described as applied thereto but application of the invention to other members in furnaces where similar conditions exist is not precluded.
  • slabs In a re-heat furnace, slabs must be heated to a very high temperature, for example l,260C, as uniformly as possible and the slabs are therefore moved along raised skid rails, usually water-cooled hollow rails supported by a gantry-like structure of water-cooled hollow members, while they are heated from above and below by intensely hot gas blast from burners.
  • a very high temperature for example l,260C
  • the supporting structure is directly in the path of the hot gas and, as well as being water-cooled, the hollow rails and supports are sheathed with refractory material.
  • the present invention in its preferred application, improves sheathing of the kind consisting of an inner layer of refractory fibrous material and an outer layer of refractory tiles.
  • the invention provides a re fractory tile of the kind consisting of a substantially C- shaped block with a hollow side to embrace one lateral side portion of a furnace member of appropriate size, an upper end to engage over the furnace member and a lower end designed to swing, under gravity, beneath the furnace member so as to extend more than half-way thereunder in engagement with a complementary tile.
  • the lower end of the block has a circumferentially projecting terminal portion with a reduced cross-sectional dimension and with circumferential surfaces facing respectively with a component in both axial directions whereby, when the terminal portion of the tile is interengaged with a complementary tile to form a collar around the surface member, the circumferential surfaces provide abutments to oppose axial separation'of the tile from its complementary tile.
  • Either an opposed pair of such tiles or one such tile and an opposed hollow-sided complementary tile can together constitute a sheathing collar of which the two components can be applied around the rail and will hold themselves in place.
  • the lower end terminal portion extends from one axial face of the block for not more than half the axial width of the block and in the other half of the width of the block there is a circumferential recess with surfaces complementary to the circumferential surfaces of the terminal portion whereby any two such tiles can form a complementary pair to interengage by their lower ends and form a collar around a furnace member.
  • the axially directed circumferential surfaces preferably comprise respectively a plane transverse inner axial surface and a segmental frusto-conical surface, this configuration providing a basis for simple and strong shapes important for moulded refractories.
  • the rail is first provided with a layer of refractory fibrous material of sufficient thickness to undergo some resilient compression when the tiles are placed as a collar around the layer so that the tendency for the layer of fibrous matrial to recover its thickness, by reaction from compression, holds the collar components in circumferential stress.
  • pairs of tile components are applied as collars in. axially-abutting longitudinal series.
  • interengagement of the tile components of each collar is such that they interlock against axial separation along the rail.
  • Such interlocking against axial separation is provided by the respective circumferential surfaces, of the collar components, and these may be provided by undercut, partially frusto-conical, tongue-and-groove or equivalent engaging faces.
  • the lower part of each tile may be increased in mass by increase in the substantially radial overall transverse thickness of the block towards its lower end.
  • the invention is suitable for use with rails or pipes of circular-section or of other cross-sectional shapes, in particular triangular or figure 8 cross-sectional shape.
  • the hollow side of each tile is shaped accordingly.
  • FIG. 1 is a fragmentary perspective cross-section of a skid rail clad with tiles in ac cordance with the invention, the usual inner sheathing layer of refractory fibre material being omitted to assist illustration of the tiles.
  • FIG. 2 is an exploded perspective view, on a larger scale, of a pair of tiles such as form the cladding shown in FIG. 1.
  • FIG. 3 is a view similar to FIG. 2 but showing a pair of tiles for a triangular-section rail.
  • FIG. 4 is a cross-section through a furnace pipe member, such as a cross-over pipe, with an inner insulating layer of refractory fibrous material and a sheathing collar formed by a pair of tiles according to another embodiment, and
  • FIG. 5 is a perspective view of one of the pair of tiles of FIG. 4.
  • a skid rail consists of a steel pipe 1 along the top of which extends a stout steel rib 2 on which billets can rest and slide in a furnace, as is well known.
  • the pipe 1, up to each side of the rib 2, is covered by an inner layer of ceramic fibre, which is not shown but fills the space 3, and this is encased by opposed identical pairs of substantially C-shaped tiles 4 and 5.
  • the tiles are moulded from any suitable refractory material, such as mullite blended with plastic refractory clay to mention only one example, each in the form of a strong relatively massive block.
  • gaps 8 between the upper ends of the tiles 4 and 5 and the sides of the rib 2 are packed with refractory mortar (not shown).
  • the width of the gaps 8 is somewhat exaggerated for illustration.
  • FIG. 2 wherein the two tile components of a collar are opposed in the positions they would occupy in being applied around the pipe 1.
  • Each tile has an upper end 4A, 5A, shaped to engage over, in effect to hook on to, the upper surface of the pipe 1, and an arcuate hollow side 4B, SE, to embrace around the respective side of the pipe 1.
  • Each terminal portion 6 and 7 springs from a respective shoulder 4E, 5E across the width of the tile and these shoulders provide terminal abutment surfaces for the pair of tiles closing together, as indicated by the arrowed lines in FIG. 2.
  • the inner axial surface 4F, SF respectively of the terminal portion is a plane transverse surface contiguous with an inner circumferential surface of the recess of the respective tile.
  • Each tile has its centre of gravity located away from its lower end extremity, in about the area indicated by the reference G, so that when hooked on to the pipe 1 each tile tends constantly to swing under the pipe and interengage with the other tile of the pair.
  • the tiles 4 and 5 have been shown as of identical shape, so that any two such tiles may compose a collar, it can be seen that if a single tile was divided through the medial transverse plane, along the dotted line L, the two resulting parts of the tile could be opposed to fit around the pipe 1 as a half-width collar.
  • the two components of the collar would then comprise a tile with a terminal portion, such as 6 or 7, in accordance with the invention, and an arcuate complementary tile with a rebated part, corresponding to the undercut recess 4D or 5D, to interengage with the terminal portion of the other tile.
  • the frusto-conical surfaces and shoulders form abutting surfaces which, once interengaged, oppose tilting-apart and axial separation of the collar components.
  • Successive pairs of collar components along a rail or pipe may be arranged alternately to oppose axial separation.
  • an identical pair of tiles 9 and 10, as shown by FIG. 3, can be provided with angular hollow sides 9B and 103 to clasp around a triangular section pipe.
  • the tiles 9 and 10 have tongues 9C and 10C to fit in grooves 10D and 9D instead of the frusto-conical and undercut interlocking parts of the tiles 4 and 5.
  • the substantially radial overall dimension of the tiles 9 and 10 is enlarged towards the lower ends to form protuberances 9F and 10F which provide mass and also form convenient hand grips for manipulating the tiles.
  • FIGS. 4 and 5 The embodiment illustrated by FIGS. 4 and 5 is similar in many respects to that of FIGS. 1 and 2 and corresponding parts have corresponding references.
  • the upper ends of the tiles meet with half-width interengaging tongues 4H, 5H and grooves 4l and SI respectively so that they completely enclose a pipe 11 with an inner fibrous layer 12.
  • the shoulders 4] and SJ are set back so that they do not abut, interengagement of the tiles being limited by abutment of the ends 6K and 7K against the ends 4L and SL of the respective recesses.
  • the circumferential projection of the terminal portions 6 and 7 in this embodiment is thus greater than the circumferential extent of the recesses.
  • a refractory tile according to claim 1 characterised thereby that the lower end terminal portion extends from one axial face of the block for not more than half the axial width of the block and in the other half of the width of the block there is a circumferential recess with surfaces complementary to the said circumferential surfaces of the terminal portion whereby any two such tiles can form a complementary pair to interengage by their lower ends and form a collar around a furnace member.
  • a refractory tile according to claim 2 characterised thereby that said circumferential surfaces of the terminal portion comprise respectively a plane transverse inner axial surface which is contiguous with an inner circumferential surface of the recess and a segmental frusto-conical surface of the terminal portior. sloping from the inner axial surface to an outer axial surface of the terminal portion.
  • a refractory tile according to claim 3 characterised thereby that the substantially radial overall transverse thickness of the block increases towards its lower end.
  • a refractory tile according to claim 2 characterised thereby that the circumferential projection of the -5 terminal portion is greater than the circumferential extent of its recess.
  • a refractory tile according to claim 1 characterised thereby that the upper end has a half-width tongue and groove to interengage with the upper end of a similar tile.
  • each terminal portion is a smooth continuation of one axial end surface of the intermediate body portion, and the axial extent of the tenninal portion is approximately one-half the axial length of the intermediate body portion, such that the inner axial end surface of the terminal portion lies approximately in the centre of the axial length of the intermediate body portion.
  • Apparatus as claimed in claim 12 wherein the upper ends of said tiles contact each other so as to sheathe the entireperiphery of an axial section of said member, said upper ends having mating projections and recesses for sealing their line of contact.
  • a refractory sheathing tile comprising a refractory body having a concave side for encompassing at least a substantial portion of one side of an axial section of the member, the upper portion of said concave side terminating in an upper end for resting on an upper surface of the member, the lower portion of said concave side terminating in a face extending generally normally and downwardly therefrom, a projecting portion extending generally normally from said face, the innermost surface of said projecting portion lying radially outwardly from the lower portion of said concave side,-a recess opening into said face axially adjacent said projecting portion and radially outwardly from the lower portion of said concave side, said recess being of generally complementary configuration with said projecting portion so as to be capable of matingly receiving the projecting portion of an identical but oppositely disposed tile.
  • Apparatus as claimed in claim 16 wherein the radially innermost surface of said projecting portion includes a surface portion having an axially facing component, and wherein the base surface of said recess has a surface portion of complementary orientation, such that said surface portions would oppose pure axial separation of an identical but oppositely disposed tile mated with said tile.
  • a pair of identical tiles each having a concave inner face, an upper end, and, at the lower end, a circumferentially extending, radially outwardly open recess underlying the lower end of said concave inner surface, and an axially adjacent projection extending generally oppositely from said recess for fitting into the recess of the other tile of the pair when oppositely disposed, such that the projection of each tile of an engaged pair underlies the lower end of the concave surface of the other tile so as to limit pivoting apart of the upper ends of the pair, the tiles being so configured that their centres of gravity tend to pivot each tile of an engaged pair toward the other about their respective upper ends.
  • a generally horizontal elongate member and a refractory sheathing collar carried by and surrounding a substantial portion of the periphery of said member, said collar comprising two refractory tiles disposed oppositely on opposite sides of said member, each tile having; a concave inner face facing said member, an upper end resting on an upper surface of said member, a radially outwardly open recess r 7 at its lower end, and a terminal portionwhich overlaps the lower end of the opposite tile, lies in said recess of the opposite tile, and opposes pivoting apart of said upper ends by bearing radially inwardly against the 7 base surface of said recess in the opposite tile, the centres of gravity of the two tiles being located so as to urge the two tiles to pivot about their upper ends into engagement at their lower ends.
  • Apparatus as claimed in claim 20 further comtiles of an engaged pair are substantially identical.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Charging Or Discharging (AREA)
US465342A 1973-05-03 1974-04-29 Sheathing for metal furnace members Expired - Lifetime US3881864A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2110473A GB1468177A (en) 1973-05-03 1973-05-03 Sheathing for metal members in furnaces

Publications (1)

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US3881864A true US3881864A (en) 1975-05-06

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US465342A Expired - Lifetime US3881864A (en) 1973-05-03 1974-04-29 Sheathing for metal furnace members

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US (1) US3881864A (fr)
JP (1) JPS5027806A (fr)
AU (1) AU473865B2 (fr)
BE (1) BE814459A (fr)
DE (1) DE2421249A1 (fr)
ES (1) ES425932A1 (fr)
FR (1) FR2228206B1 (fr)
GB (1) GB1468177A (fr)
LU (1) LU69982A1 (fr)
NL (1) NL7405949A (fr)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995665A (en) * 1974-05-28 1976-12-07 The Carborundum Company Thermal insulation element
US4015636A (en) * 1975-12-04 1977-04-05 The Babcock & Wilcox Company Ceramic refractory covering members
US4049371A (en) * 1976-03-15 1977-09-20 Combustion Engineering, Inc. Pipe insulation
WO1981001451A1 (fr) * 1979-11-15 1981-05-28 F Campbell Isolateur triangulaire tronque d'interverrouillage
US4354824A (en) * 1981-04-02 1982-10-19 Cameron Iron Works, Inc. Method and device for reducing heat flow from a workpiece to a skip pipe
US4362506A (en) * 1981-04-13 1982-12-07 Fulbright & Jaworski Single location insulator locking device
US4402345A (en) * 1980-02-04 1983-09-06 Urquhart Engineering Co., Ltd. Precast furnace pipe insulation
US4450872A (en) * 1982-06-18 1984-05-29 The Babcock & Wilcox Company Fiber pipe protection for water cooled pipes in reheat furnaces
US4539055A (en) * 1982-06-18 1985-09-03 The Babcock & Wilcox Company Fiber pipe protection for water cooled pipes in reheat furnaces
US4776790A (en) * 1986-12-22 1988-10-11 Norton Company Refractory shields for curved and straight superheater tubes
US5192039A (en) * 1991-10-07 1993-03-09 Ticon, Inc. Hanger insulation system
WO2000020814A1 (fr) * 1998-10-01 2000-04-13 M.H. Detrick Co. Isolation refractaire de conduit pour four
US6136117A (en) * 1996-12-12 2000-10-24 Ngk Insulators, Ltd. And Mitsubishi Heavy Industries, Ltd. Boiler tube protector and a method for attaching such protector to a boiler tube
US6179610B1 (en) 1999-12-30 2001-01-30 Paul V. Suey Composite refractory tile for metallurgical furnace members
US6501028B1 (en) * 1998-06-18 2002-12-31 Philec S.A. Thermal protection forming a heat shield
US20030084623A1 (en) * 2001-11-08 2003-05-08 Yasunori Terabe Fireproof structure and installation method for protecting water pipes
US6575738B1 (en) 2002-08-16 2003-06-10 Carole S. Nguyen Composite refractory insulating tile
WO2006061859A1 (fr) * 2004-12-07 2006-06-15 Refrasud Srl Modules de protection de creux de fours industriels

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5636915Y2 (fr) * 1976-11-08 1981-08-31
DE2805098C2 (de) * 1978-02-07 1983-09-15 Adolf A. Fleischmann Inh. Werner Fleischmann, 6000 Frankfurt Feuerfest ummanteltes Gleitrohr für Stoß- oder Hubherdöfen
DE2910775C2 (de) * 1979-03-19 1984-12-06 Adolf A. Fleischmann Inh. Werner Fleischmann, 6000 Frankfurt Wasser- oder dampfgekühltes Gleitrohr für Stoß- oder Hubherdöfen
GB2118283B (en) * 1982-04-14 1985-07-10 Morgan Refractories Ltd Refractory sheathing
DE3231736C2 (de) * 1982-08-26 1985-03-28 Didier-Werke Ag, 6200 Wiesbaden Ummantelung zur Isolierung eines gekühlten Gleit-, Trag- oder Querrohres in einer Feuerungsanlage
GB9002821D0 (en) * 1990-02-08 1990-04-04 Foseco Int Insulation sheaths

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2884879A (en) * 1955-11-09 1959-05-05 Corriston John Wilson Insulated water-cooled furnace members
US3055651A (en) * 1960-09-02 1962-09-25 Babcock & Wilcox Co Interlocking ceramic tile elements

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2435362A (en) * 1942-12-11 1948-02-03 Manufacturers Trading Corp Work-supporting structure and protective means for furnaces and the like

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2884879A (en) * 1955-11-09 1959-05-05 Corriston John Wilson Insulated water-cooled furnace members
US3055651A (en) * 1960-09-02 1962-09-25 Babcock & Wilcox Co Interlocking ceramic tile elements

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995665A (en) * 1974-05-28 1976-12-07 The Carborundum Company Thermal insulation element
US4015636A (en) * 1975-12-04 1977-04-05 The Babcock & Wilcox Company Ceramic refractory covering members
US4049371A (en) * 1976-03-15 1977-09-20 Combustion Engineering, Inc. Pipe insulation
WO1981001451A1 (fr) * 1979-11-15 1981-05-28 F Campbell Isolateur triangulaire tronque d'interverrouillage
US4275771A (en) * 1979-11-15 1981-06-30 Campbell Frank Jun Interlocking truncated triangular insulator
US4402345A (en) * 1980-02-04 1983-09-06 Urquhart Engineering Co., Ltd. Precast furnace pipe insulation
US4354824A (en) * 1981-04-02 1982-10-19 Cameron Iron Works, Inc. Method and device for reducing heat flow from a workpiece to a skip pipe
US4362506A (en) * 1981-04-13 1982-12-07 Fulbright & Jaworski Single location insulator locking device
US4450872A (en) * 1982-06-18 1984-05-29 The Babcock & Wilcox Company Fiber pipe protection for water cooled pipes in reheat furnaces
US4539055A (en) * 1982-06-18 1985-09-03 The Babcock & Wilcox Company Fiber pipe protection for water cooled pipes in reheat furnaces
US4776790A (en) * 1986-12-22 1988-10-11 Norton Company Refractory shields for curved and straight superheater tubes
US5192039A (en) * 1991-10-07 1993-03-09 Ticon, Inc. Hanger insulation system
US6136117A (en) * 1996-12-12 2000-10-24 Ngk Insulators, Ltd. And Mitsubishi Heavy Industries, Ltd. Boiler tube protector and a method for attaching such protector to a boiler tube
US6152087A (en) * 1996-12-12 2000-11-28 Ngk Insulators, Ltd. Boiler tube protector and a method for attaching such protector to a boiler tube
US6501028B1 (en) * 1998-06-18 2002-12-31 Philec S.A. Thermal protection forming a heat shield
US6102694A (en) * 1998-10-01 2000-08-15 M. H. Detrick Co. Pipe refractory insulation for furnaces
GB2365104A (en) * 1998-10-01 2002-02-13 Detrick M H Co Pipe refractory insulation for furnaces
WO2000020814A1 (fr) * 1998-10-01 2000-04-13 M.H. Detrick Co. Isolation refractaire de conduit pour four
GB2365104B (en) * 1998-10-01 2003-02-26 Detrick M H Co Pipe refractory insulation for furnaces
US6179610B1 (en) 1999-12-30 2001-01-30 Paul V. Suey Composite refractory tile for metallurgical furnace members
US20030084623A1 (en) * 2001-11-08 2003-05-08 Yasunori Terabe Fireproof structure and installation method for protecting water pipes
US20060174559A1 (en) * 2001-11-08 2006-08-10 Yasunori Terabe Fireproof structure and installation method for protecting water pipes
US7204061B2 (en) * 2001-11-08 2007-04-17 Mitsubishi Heavy Industries, Ltd. Fireproof structure and installation method for protecting water pipes
US6575738B1 (en) 2002-08-16 2003-06-10 Carole S. Nguyen Composite refractory insulating tile
WO2006061859A1 (fr) * 2004-12-07 2006-06-15 Refrasud Srl Modules de protection de creux de fours industriels

Also Published As

Publication number Publication date
AU473865B2 (en) 1976-07-08
GB1468177A (en) 1977-03-23
FR2228206A1 (fr) 1974-11-29
ES425932A1 (es) 1976-07-01
JPS5027806A (fr) 1975-03-22
LU69982A1 (fr) 1974-08-06
AU6850674A (en) 1975-11-06
FR2228206B1 (fr) 1978-06-02
NL7405949A (fr) 1974-11-05
DE2421249A1 (de) 1974-11-14
BE814459A (fr) 1974-09-02

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