EP0066986B1 - Revêtement d'isolation d'une partie de four - Google Patents

Revêtement d'isolation d'une partie de four Download PDF

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Publication number
EP0066986B1
EP0066986B1 EP82302555A EP82302555A EP0066986B1 EP 0066986 B1 EP0066986 B1 EP 0066986B1 EP 82302555 A EP82302555 A EP 82302555A EP 82302555 A EP82302555 A EP 82302555A EP 0066986 B1 EP0066986 B1 EP 0066986B1
Authority
EP
European Patent Office
Prior art keywords
clip
tiles
projections
spring
refractory
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.)
Expired
Application number
EP82302555A
Other languages
German (de)
English (en)
Other versions
EP0066986A1 (fr
Inventor
Clyde Arthur Holmes
Macy William Vance
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.)
USS Engineers and Consultants Inc
Original Assignee
USS Engineers and Consultants Inc
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 USS Engineers and Consultants Inc filed Critical USS Engineers and Consultants Inc
Priority to AT82302555T priority Critical patent/ATE12829T1/de
Publication of EP0066986A1 publication Critical patent/EP0066986A1/fr
Application granted granted Critical
Publication of EP0066986B1 publication Critical patent/EP0066986B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • F27D1/14—Supports for linings
    • F27D1/141—Anchors therefor
    • 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

  • This invention relates to an insulation for furnace members, particularly to the type utilizing a spring-clip for attachment to the member.
  • the primary object of the instant invention is to provide a spring-clip type of insulation which is easy to install and has longer service life than any presently available.
  • an improved insulation is provided for internally cooled furnace members.
  • the product includes a generally C-shaped metal spring-clip substantially all of the inner surface of which is designed for making intimate contact with the exterior surface of the furnace member. This assures proper cooling of the clip itself and retention of its spring-like properties.
  • the clip has inwardly protruding end portions partially closing its interior opening. The spacing between these end portions is intentionally made significantly less than the cross sectional dimension of the furnace member at the location to be abutted by the clip. This assures proper spring action after the clip is spread open for insertion transversely over, and on to the periphery, of the member.
  • the springiness of the clip itself and the spacing just mentioned are correlated so as to permit both 1) spreading of the clip for insertion, and 2) retention of it at elevated furnace temperatures by continued spring action.
  • the clip has a plurality of spaced outwardly extending projections, and at least two circumferentially segmented refractory tiles formed on its outer surface covering the projections.
  • forming we refer to either conventional casting or pressing techniques. It is important that the tiles be so formed as to completely cover the surface of the projections and thus be joined thereby to the clip so as to withstand furnace vibration.
  • the tiles are spaced apart at adjacent ends remote from the C-opening, sufficiently to prevent their abutment when the clip is spread for insertion.
  • An important feature of the invention is that, prior to formation of the tiles on the clip, an organic lubricant coating is applied to the outer clip surface.
  • the lubricant prevents bonding of the tiles to the clip and excessive adhesion thereto.
  • the lubricant preferably is of petroleum base and may be, for example, automotive grease.
  • an insert is provided where it is desired to cover the entire periphery of the furnace member.
  • the insert includes a metal clip, also having spaced outward projections, and a refractory tile formed thereon. Since the insert is not required to flex for insertion no lubricant coating is required.
  • the invention also provides a method for making insulation for furnace members. It includes forming a generally C-shaped metal spring-clip with spaced projections extending outwardly from it.
  • the clip is of heat-treatable steel composition and the method includes heat treatment of the clip to Rockwell C 45/ 55 aim 50 after forming.
  • An organic lubricant is applied to the outer clip surface prior to formation of refractory tiles covering the projections.
  • the tiles are formed by either casting or pressing, in either case making intimate contact with and covering the projections. After this the tiles are cured by conventional methods to dry them.
  • a method is provided for making a spring-clip type insulation which can be installed as a unit on the furnace member.
  • the product of this invention includes spring-clip 10 having projections 12 on which refractory tiles 14, 16 are formed. It is essential that the clip have sufficient springiness to remain attached to member 17 (shown in Figure 3) at service temperature in the furnace. Where used on water cooled verticals, cross supports and skid pipes in steel slab reheating furnaces, it is important that substantially all of the inner surface of clip 10 maintain contact with the pipe so that the clip will remain cool and not lose spring action.
  • a heat treatable steel composition is used for the clip material so that it may be formed readily then austenitized, quenched and tempered to achieve desired springiness. Either SAE 1050 steel or410 stainless steel are examples of compositions which may be used.
  • Projections 12 serve to lock the tiles so that they will remain attached to the clip. It is desirable that they be of stainless steel (AISI Type 304 for example) so as to resist oxidation by the furnace atmosphere. A V-shape is preferred for best locking action.
  • the prongs of V-projections 12' remote from clip opening 13 preferably lie in a plane normal to the axis of the pipe 17 (see Figure 1 or 3).
  • the tiles may be of any refractory composition suitable for the temperatures to which they will be exposed in the furnaces.
  • the invention is limited to tiles which are formed by casting or pressing of particulates, into a mold so as to be formed directly on to and covering the projections.
  • Refractory of sufficient thermal resistance must be used to protect the clip.
  • Adequate spacing 18 must be provided between the tiles at their adjacent lower ends as shown to permit spreading of the clip for insertion without abutment and breakage of the tile sections.
  • An essential feature of the present invention is that prior to forming the tiles, an organic lubricant coating is applied to the outer surface of clip 10. This prevents adhesion and reduces the coefficient of friction between the tiles and the clip.
  • the clip when the clip is spread for insertion on to the pipe, it may flex without breaking the tiles.
  • the tiles remain joined to the clip since they are formed directly on to and locked in place by projections 12.
  • any organic lubricant or other conventional mold parting compound may be used, we prefer a petroleum base material such as automotive grease.
  • an insert 20 is provided as shown in Figures 2 and 3.
  • a metal clip 22 is provided of circular segmental shape and has spaced projections 24, 26.
  • Refractory tile 28 is formed covering the projections so as to be joined to the clip. It will be quite apparent that insert clip 22 need not have the springiness which is essential for clip 10.
  • Clip 22 has a dimple or button-like projection 27 ( Figures 2 and 5) protruding from its opposite ends for engaging mateable slots 29 ( Figure 4) in adjoining ends of spring clip 10. The total assembly is shown in Figure 3 mounted on pipe 17.
  • Ceramic fiber blanket 32 is used to partially fill the space between tiles 14 and 16, and air-set mortar is used to fully close the joint and remains locked in place by grooves 34, 36 adjacent to the outer tile surfaces.
  • Mateable step-joints 38, 40 which are sealed with refractory cement are provided on adjacent edges of tiles 14, 16 and insert tile 28. These mortared steps are essential for providing protection of the exposed portions of the clips from the furnace atmosphere and temperature. When the insulation is used on skid pipes, thus not permitting use of an insert for complete covering of the pipe, the exposed parts of the spring clip are covered by air-set refractory cement.
  • the insulation is made first by rolling or forming a band to a shape and of dimensions closely conforming to that of the member on which it is to be mounted. Then, either as a separate step or part of the initial forming operation, the opposed ends of the clip are crimped to an intentionally and significantly smaller spacing than the cross sectional distance of the location to be abutted by those ends on the pipe or member on which the clip is to be mounted. This distance will depend on the springiness of the clip itself and other factors e.g. pipe diameter etc. For a 5-1/2 inch (14 cm) pipe covered 270° of its circumference we crimp from a normal spacing of 4-1/2 inches (11.4 cm) to anywhere from 3-1/2-5-5/8 inches (8.9-9.2 cm).
  • the projections desirably by welding Type 304 stainless rod to the clip surface in V-shapes.
  • the clip is heat treated byaustenitizing at about 1650°F (899°C), water or oil quenching as indicated and then tempering between 400-1000°F (204-538°C) to attain a Rockwell C hardness of 50.
  • an essential feature involves applying an organic lubricant to outer surface 42 of clip 10.
  • a mold is then placed around the clip and refractory material cast or pressed in place covering the projections.
  • the refractory is cured by drying in conventional fashion forming an insulation which can be easily mounted on furnace members.
  • the invention would seemingly work quite well on support members of other than circular shape for example triangular, trapezoidal, or rectangular with side indentations.
  • the only requirements would be that the member have sufficient indentation in its cross section to permit gripping action of a spring-clip thereon, and that the member have corners of sufficiently large curvature that the clip can tightly engage those areas to remain cooled by the member itself where it is used in high temperature environments.
  • many different materials might be used for the spring-clip provided it has sufficient springiness to remain in position under the service conditions of the particular application. The furnace temperature, atmosphere and degree of vibration may be important factors in selection of the material.
  • projections other than V-shape would presumably work.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Clamps And Clips (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Processes Specially Adapted For Manufacturing Cables (AREA)
  • Thermal Insulation (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Element Separation (AREA)
  • Tunnel Furnaces (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Resistance Heating (AREA)
  • Packages (AREA)

Claims (8)

1. Isolation extérieure pour un élément de four de forme allongée et refroidi intérieurement, comprenant une agrafe ou un collier ouvert à ressort pour l'attache à l'élément et plusieurs pièces de forme ou briques réfractaires segmentées circonférentiellement et supportées par le collier, le collier ayant une forme générale en C et étant dimensionné pour s'ajuster sur et pour serrer élastiquement l'élément, en établissant avec lui un contact conducteur de chaleur, le collier présentant extérieurement des saillies ou crampons pour supporter les briques, caractérisée en ce que les briques (14, 16) sont formées sur place, contre la surface extérieure du collier (10), de manière qu'elles soient assemblées de façon permanente au collier du fait que les crampons (12, 12') sont noyés dans le matériau réfractaire formant les briques, lesquelles recouvrent le collier (10) et les crampons (12, 12'), et en ce qu'une couche de lubrifiant organique est disposée entre le collier (10) et les briques (14, 16).
2. Isolation selon la revendication 1, caractérisée en ce que les crampons (12, 12') sont formés chacun de deux branches qui divergent vers l'extérieur un forme de V.
3. Isolation selon la revendication 1 ou 2, caractérisée en ce que le lubrifiant organique est une composition à base de pétrole.
4. Isolation selon la revendication 1, 2 ou 3, caractérisée en ce qu'elle comprend en outre une pièce isolante complémentaire (20) à insérer, qui est dimensionnée pour recouvrir l'élément dans l'ouverture située entre les extrémités du collier en C (10), cette pièce complémentaire possédant un segment de collier (22) conformé pour s'appliquer intimement contre l'élément et dont les extrémités viennent en contact avec les extrémités du collier (10) mentionné en premier, et en ce que le segment de collier (22) de la pièce isolante complémentaire présente des renflements (24, 26) dirigés vers l'extérieur, la pièce isolante complémentaire possédant en outre une brique réfractaire (28) qui est formée contre la surface extérieure dudit segment de collier (22) et par-dessus des crampons (24, 26) disposés sur ce segment de collier.
5. Procédé pour confectionner une isolation extérieure pour un élément de four de forme allongée et refroidi à l'intérieur, comprenant des étapes qui consistent:
à façonner une agrafe ou un collier à ressort, en métal, de forme générale en C, de manière qu'il reste en contact intime sur pratiquement sur toute sa surface intérieure avec ledit élément, de sorte qu'il est refroidi par cet élément et qu'il reste en place sur lui sous l'effet de son élasticité, et
à disposer des saillies ou des crampons s'étendant vers l'extérieur et mutuellement espacés sur ce collier à ressort, caractérisé en ce qu'il comprend en outre:
l'application d'un lubrifiant organique à la surface extérieure du collier à ressort puis
la formation des briques réfractaires segmentées circonférentiellement sur ce collier, avec recouvrement des crampons, et le durcissement de ce matériau réfractaire.
6. Procédé selon la revendication 5, où le collier à ressort métallique est en acier de traitement et le procédé comprend en outre le traitement thermique du collier à ressort, avant l'application du lubrifiant sur lui, pour lui conférer une dureté Rockwell C de 45/55, de préférence une dureté Rockwell C de 50.
7. Procédé selon la revendication 5 ou 6, où le lubrifiant est une composition à base de pétrole.
8. Procédé selon la revendication 5, 6 ou 7, où le façonnage du collier à ressort comprend la réduction de l'écartement des parties extrêmes opposées du collier, jusqu'à en écartement qui est nettement inférieur à la distance qui subsiste entre les extrémités du collier après sa mise en place sur ledit élément.
EP82302555A 1981-05-20 1982-05-19 Revêtement d'isolation d'une partie de four Expired EP0066986B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82302555T ATE12829T1 (de) 1981-05-20 1982-05-19 Isolierauskleidung eines ofenteils.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US26668681A 1981-05-20 1981-05-20
US266686 1988-11-07

Publications (2)

Publication Number Publication Date
EP0066986A1 EP0066986A1 (fr) 1982-12-15
EP0066986B1 true EP0066986B1 (fr) 1985-04-17

Family

ID=23015591

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82302555A Expired EP0066986B1 (fr) 1981-05-20 1982-05-19 Revêtement d'isolation d'une partie de four

Country Status (9)

Country Link
EP (1) EP0066986B1 (fr)
JP (1) JPS57194207A (fr)
AT (1) ATE12829T1 (fr)
BR (1) BR8202911A (fr)
CA (1) CA1186609A (fr)
DE (1) DE3263092D1 (fr)
DK (1) DK225182A (fr)
ES (2) ES512346A0 (fr)
ZA (1) ZA823216B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416896C1 (de) * 1994-05-13 1995-04-27 Bloom Eng Europa Gmbh Isolierkörper
US6887551B2 (en) 2003-05-16 2005-05-03 Exxonmobil Research & Engineering Co. Anchoring system and snap-fit methodology for erosion resistant linings
CN106906003B (zh) * 2017-04-21 2022-11-18 武汉科技大学 一种煤气化炉用支撑托板

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1076473A (fr) * 1952-07-23 1954-10-27 Maison Victor Nizet Collier pour armature de revêtement isolant thermique du type à bourrage
DE1550047A1 (de) * 1967-03-10 1969-10-16 Mannesmann Ag Waermeisolierte Rohrleitung
DE1929891A1 (de) * 1969-06-12 1971-02-18 Plibrico Co Gmbh Verfahren zum Ummanteln der Rohre eines Tragrohrsystems in Stoss- oder Hubherdoefen
BE789995A (fr) * 1971-10-13 1973-02-01 Plibrico Co Gmbh Procede et dispositif pour envelopper des tubes coulissants ou analogues
US4140483A (en) * 1976-05-06 1979-02-20 Morgan Refractories Limited Refractory insulation
DE2940726A1 (de) * 1979-10-08 1981-04-16 Plibrico Co GmbH, 4000 Düsseldorf Feuerfeste ummantelung fuer ein gekuehltes rohrsystem

Also Published As

Publication number Publication date
ZA823216B (en) 1983-03-30
DK225182A (da) 1982-11-21
ES8307351A1 (es) 1983-06-16
BR8202911A (pt) 1983-05-03
CA1186609A (fr) 1985-05-07
ATE12829T1 (de) 1985-05-15
EP0066986A1 (fr) 1982-12-15
JPS57194207A (en) 1982-11-29
DE3263092D1 (en) 1985-05-23
ES270331U (es) 1983-07-16
ES270331Y (es) 1984-02-16
ES512346A0 (es) 1983-06-16

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