GB1589613A - Thermal insulating element for furnace skid pipes and beams - Google Patents
Thermal insulating element for furnace skid pipes and beams Download PDFInfo
- Publication number
- GB1589613A GB1589613A GB26375/76A GB2637576A GB1589613A GB 1589613 A GB1589613 A GB 1589613A GB 26375/76 A GB26375/76 A GB 26375/76A GB 2637576 A GB2637576 A GB 2637576A GB 1589613 A GB1589613 A GB 1589613A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sheets
- skid
- pipe
- studs
- knitted
- 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
Links
- 238000009413 insulation Methods 0.000 claims description 27
- 239000000919 ceramic Substances 0.000 claims description 14
- 239000000835 fiber Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000009940 knitting Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229910010293 ceramic material Inorganic materials 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 2
- 239000011229 interlayer Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- IHPYMWDTONKSCO-UHFFFAOYSA-N 2,2'-piperazine-1,4-diylbisethanesulfonic acid Chemical compound OS(=O)(=O)CCN1CCN(CCS(O)(=O)=O)CC1 IHPYMWDTONKSCO-UHFFFAOYSA-N 0.000 description 1
- 239000007990 PIPES buffer Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
- D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials
- D04B1/16—Other fabrics or articles characterised primarily by the use of particular thread materials synthetic threads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/026—Knitted fabric
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/105—Ceramic fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/304—Insulating
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Thermal Insulation (AREA)
Description
(54) AN IMPROVED THERMAL INSULATING
ELEMENT FOR FURNACE SKID PIPES AND BEAMS
(71) We, BRITISH STEEL CORPOR
ATION, a Corporation incorporated and existing under the Iron and Steel Act 1967 whose principal office is at 33 Grosvenor
Place, London, S.W.1, England, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
The invention relates to thermal insulation elements, and particularly, but not exclusively, to insulation elements for cooled support beams in furnaces.
In many metallurgical process furnaces, particularly continuous reheating furnaces in the steel industry, flat metal stock is heated from both sides while passing more or less continuously through the furnace.
During this process the stock is supported on an open array of hollow beams which are cooled to maintain their mechanical strength. The array of hollow beams may be a fixed structure over which the stock is slid by a pushing mechanism outside the furnace, in which case the array is commonly called a skid system, the hollow beams on which the stock slides being called skid pipes. Alternatively, the array may consist of a fixed part and a moving part which are so arranged that the stock may be lifted from the fixed beams by the moving beams, transported a small way along the furnace and the replaced on the fixed beams. This latter is commonly called a walking beam system.
In both systems of support the degree of cooling required and the total surface area of the array of hollow beams are such that without insulation a significant part of the heat input to the furnace may be lost to the beam cooling system. Typically, 25% of the heat input may be lost from the furnace in this way. Much has been done to reduce this loss by insulating the array of hollow beams.
A common method of insulating skids is indicated in Figure 1. This type of insulation has a fairly short life, failing in several ways, e.g. by loss of grouting and subsequent failure of tack welds, leading to total loss of the segments; and by oxidation of the reinforcement and temperature gradients in the case segments, leading to disintegration and loss of refractory.
Developments in the field of refractory fibrous materials (ceramic fibres) have resulted in some proposals and applications of these materials for beam insulation. The present invention is concerned with a further method of using ceramic fibres for beam insulation.
The invention provides a thermal insulation element comprising at least two sheets of knitted ceramic fibre material connected together in face-to-face relationship and in which there are apertures in one or more sheets whereby the sheets can be hung from projections on a face so to insulate that face, two of the sheets having bulked ceramic fibres contained therebetween.
It is further preferred that the bulked caramic fibres are connected to the said two sheets.
Preferably, one or more of the sheets have apertures along two opposed edges, whereby it or they may be wrapped around the hollow beam or a pipe, and the opposed edges can be hung from one or two series of projections along the beam or pipe.
Conveniently the opposed edges of the sheet or sheets can be hung from a single series of projections.
Alternatively there are several series of projections around the periphery of the beam or pipe.
Advantageously, the sheets are connected only along one edge.
Conveniently ceramic material is spray coated onto an outwardly facing surface of one of the sheets.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which
Figure 1 is a cross-section of a prior art skid pipe, and
Figure 2 is a cross-section of a skid pipe according to the present invention.
As shown in Figure 1 skid pipes have previously been insulated using cast refractory insulation elements (7) formed on wire mesh reinforcement (8) which is welded to the skid pipe at 9. The gaps between the insulation elements and between the insulation elements and the skid rail weaver bar have in the past been filled with grout.
In accordance with the invention ceramic fibre is spun into thick yarn which is then knitted into a flexible sack indicated at 11 (which shows the knitted yarn in section). A small quantity of bulk ceramic fibre 12 is placed in the sack.
The completed sack in wrapped around a hollow beam or skid pipe 10 and attached by hooking stitches or specially knitted loops over small studs 14 welded to the beam.
The outer surface of the attached sack 15 may be given some further protection, e.g.
by a spray coating of same material.
Figure 2 indicates in section the suggested method of insulating a hollow beam showing specifically a skid rail on top of a skid pipe.
Although Figure 2 indicates only two rows of studs for attaching the edges of the cushion to a skid, more studs distributed over the beam can be used if desired, with the knitting popped or teased over each.
An alternative method of using knitted caramic fibre insulation is in the form of multiple layers of single knitted thickness superimposed with at least one loose fibre interlayer, with or without spray coatings for any or all layers.
A convenient method of attachment may be achieved by knitting a row of "buttonholes" near the edge to be attached and buttoning the knitting to the studs. Attachment for completely insulated beams may be achieved using a single row of studs and buttoning both edges to that single row (more studs can be used if required of course).
WHAT WE CLAIM IS:
1. A thermal insulation element comprising at least two sheets of knitted ceramic fibre material connected together in fact-toface relationship and in which there are apertures in one or more sheets whereby the sheets can be hung from projections on a face so to insulate that face, two of the sheets having bulked ceramic fibres contained therebetween.
2. An insulation element as claimed in claim 1 in which the bulked ceramic fibres are connected to the said two sheets.
3. An insulation element as claimed in
Claim 1 or 2 in which said one or more sheets have apertures along two opposed edges, whereby it or they may be wrapped around a hollow beam or a pipe, and the opposed edges can be hung from one or two series of projections along the beam or pipe.
4. An insulation element as claimed in any one of the preceding claims in which the sheets are connected only along one edge.
5. An insulation element as claimed in any one of the preceding claims in which ceramic material is spray coated onto an outwardly facing surface of one of the sheets.
6. A thermal insulation element substantially as hereinbefore described with reference to and as shown in Figure 2 of the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (6)
1. A thermal insulation element comprising at least two sheets of knitted ceramic fibre material connected together in fact-toface relationship and in which there are apertures in one or more sheets whereby the sheets can be hung from projections on a face so to insulate that face, two of the sheets having bulked ceramic fibres contained therebetween.
2. An insulation element as claimed in claim 1 in which the bulked ceramic fibres are connected to the said two sheets.
3. An insulation element as claimed in
Claim 1 or 2 in which said one or more sheets have apertures along two opposed edges, whereby it or they may be wrapped around a hollow beam or a pipe, and the opposed edges can be hung from one or two series of projections along the beam or pipe.
4. An insulation element as claimed in any one of the preceding claims in which the sheets are connected only along one edge.
5. An insulation element as claimed in any one of the preceding claims in which ceramic material is spray coated onto an outwardly facing surface of one of the sheets.
6. A thermal insulation element substantially as hereinbefore described with reference to and as shown in Figure 2 of the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB26375/76A GB1589613A (en) | 1977-09-23 | 1977-09-23 | Thermal insulating element for furnace skid pipes and beams |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB26375/76A GB1589613A (en) | 1977-09-23 | 1977-09-23 | Thermal insulating element for furnace skid pipes and beams |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1589613A true GB1589613A (en) | 1981-05-13 |
Family
ID=10242672
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB26375/76A Expired GB1589613A (en) | 1977-09-23 | 1977-09-23 | Thermal insulating element for furnace skid pipes and beams |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1589613A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2205929A (en) * | 1987-06-18 | 1988-12-21 | Fibre Tech Ltd | Fibrous material packaging |
US5089072A (en) * | 1987-06-18 | 1992-02-18 | Fibre Techniques Limited | Method of protecting a catalytic converter block with a fibrous material packing |
-
1977
- 1977-09-23 GB GB26375/76A patent/GB1589613A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2205929A (en) * | 1987-06-18 | 1988-12-21 | Fibre Tech Ltd | Fibrous material packaging |
GB2205929B (en) * | 1987-06-18 | 1990-09-19 | Fibre Tech Ltd | Fibrous material packaging |
US5089072A (en) * | 1987-06-18 | 1992-02-18 | Fibre Techniques Limited | Method of protecting a catalytic converter block with a fibrous material packing |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |