DE2435001A1 - FIRE-RESISTANT, THERMAL INSULATION COVERING A WATER-COOLED PIPE IN A HEAT FURNACE OR SIMILAR CONSTRUCTION OF THERMAL CONSTRUCTION - Google Patents

Description

PLIBHICO Gompany GmbHG, Düsseldorf

Fireproof, heat-insulating casing of a water-cooled pipe in a heating furnace or similar heat-enclosing constructions

Summary of the description:

Prefabricated, fireproof, heat-insulating component that is firmly connected to the inside with a metal band, as well as anchors, a firm connection of the metal strip and the refractory component with the tube of a heating furnace or another heat-enclosing Ensure construction.

Task for the invention; "

In the metal industry and especially in the iron and steel industry It is a common practice to use heating furnaces that place pieces of metal, such as billets or steel slabs, onto the Bring the desired temperature for the purpose of further processing, e.g. Forging in order to roll sheet metal from these billets or slabs, for example. It is known that these ovens have support structures that carry the workpieces as they pass through the furnace. The supporting structure must have sufficient mechanical strength have to absorb the weight of the workpieces and at the same time also to withstand the high temperature in the furnace, which is often more than 100 ° C and, as is well known, so low Volume so that they do not have the available internal furnace volume reduced too drastically, as would be the case for combustion in an underfired Oven is necessary.

A common type of support structure consists of a large number of vertical standpipes with a large number at the upper ends are fastened by cross tubes at certain intervals, which are transverse

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to the oven and on which there are several sliding tubes which extend in the longitudinal direction of the furnace and which have slide rails attached on the top. All these Pipes are water-cooled so that they can withstand the high temperatures already mentioned. The sole water cooling of the However, pipes of the furnace would lead to uneven heating of the workpieces, since the parts of the workpieces that come into contact with the slide rails are, on the contact surfaces would stay cooler than the other parts of the workpieces. In addition, a water-cooled support structure causes high heat losses in the furnace, because a large part of the amount of heat put into the furnace heats the water in the pipes and not the workpieces. the end for this reason, water-cooled support tubes usually come with a Fireproof, heat-insulating material sheathed.

Many suggestions for lining these pipes with refractory material have already been made. For example, U.S. Corriston's patent No. 2.O22.649 of December 3, 1935 on a design in which Pins are welded to the pipes and with the pins using Refractory material are coated. Likewise, the U.S. Bloom Patent No. 2,693,352 dated November 2, 1954 such pins attached to tubes are welded and which hold a wire mesh construction, which is then clad with refractory material. These and other similar constructions of the type mentioned are based on one of or several welded connections that are made on the pipes, especially the sliding and cross pipes. These welds are carried out to attach a metallic anchor to the pipes. A Such an anchor is necessary for the fireproof, heat-insulating To hold material and prevent it from falling off the pipes if, for any reason, cracks should appear. The welding process the aforementioned constructions is normally carried out on site in the ovens and is expensive because of the required

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Skilled workers, facility and the working hours to be expended. In addition there is also the fact that possible welding defects are not unknown and if these occur, parts of the refractory insulation can be lost, as a result, they no longer guarantee the protection of the pipes.

It is also a known state of the art, pre-fabricated, fire-proof! to use solid fittings such as U.S. Morton patent No. 2,435,362 dated February 3, 1948 shows which | Matching, refractory parts through composite elements made from refractory material being held. It is also the state of the art to deliver prefabricated parts made of refractory casting compounds, in which adjacent Parts are held on the tubes by intricate interlocking elements. Such prefabricated parts need a lot can be precisely shaped and the intricate interlocking elements can be easily handled or transported damaged, which can result in high costs. Most of the time, such prefabricated, refractory parts can not be sufficiently firmly in the Pipes are attached and therefore do not provide optimal protection " for pipe construction. The U.S. Corriston Patents No. 2,884,879 dated May 5, 1959 and by Barker No. 3,451,661 dated June 25, 1969 are typical of designs as we have just mentioned.

The invention ;

The present invention overcomes the aforementioned disadvantages of the prior art by providing a prefabricated, proposes heat-insulating, refractory part, which is provided with an inner channel that extends in the longitudinal direction of the extending protective tubes and the inside has a substantially cylindrical surface. A metal band is on the inside surface of the refractory fitting and is intimately connected to the refractory body by anchor elements, which with in the

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refractory body embedded projections are provided. The inner, partially cylindrical surface of the metal belt is with a part of the outer surface of the tubes of the heating furnace arranged so that the contact of the two surfaces of the heat transport serves. Anchors are used to securely attach the metal strips of the prefabricated, heat-insulating refractory part provided on the pipes of the furnace. One embodiment of the invention includes a pair of opposed, prefabricated, thermally insulating refractory parts of the type described, in which the anchorages ensure a secure fastening of the opposite, Provide prefabricated, heat-insulating refractory parts around a pipe of the furnace such as the cross pipe.

The invention further provides a first, prefabricated, heat-insulating, refractory part before, in which the metal strip is equipped with end pieces that consist of the partially cylindrical Surface part of the passage area protrude, namely over a cut surface through the longitudinal axis of the pipe, and in which anchors are provided at the ends, with their help the metal strips of the heat-insulating refractory part can be attached to the slide rail of the furnace, for example. In addition, the invention itself relates to a construction as last described, in which a second or third heat-insulating Refractory component is assigned to the slide rail tube, on the opposite sides of the slide rail and on or above the first, prefabricated heat-insulating Part.

Further features of the invention include the provision of access openings to the anchors of the invention, which one after

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Attaching the metal tape of the heat-insulating refractory pipe to the pipe of the furnace must be filled to the pipe carefully to envelop.

Other significant design features of the invention are presented in the following detailed description of certain preferred ones Referring to embodiments of the invention.

The drawings :

Figure 1 is a perspective, isometric view of a typical Warming furnace in which the invention described can be applied

Fig. 2 is an isometric view of a prefabricated thermal insulation , refractory part according to an embodiment of Invention $

Fig. 3 is a side view showing how a pair of heat insulating refractory fittings of Fig. 2 are attached to the standpipe of a furnace; by rotating the view 9o one obtains the same for a cross tube

Figure 4 is a cross-sectional view taken along line 4-4 of Figure 3 and looking in the direction of the arrows;

Figure 5 is an isometric view, with partial section, showing the attachment of the pre-fabricated thermally insulating fitting Figure 3 shows a slide rail of a heating furnace according to the invention;

Fig. 6 is a side section of Fig. 5;

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Figure 7 is a vertical sectional view taken along line 7-7 the marked arrows;

Figure 8 is an isometric view, partially in section, showing a modified embodiment of my invention for isolating a Shows a furnace slide tube;

Figure 9 is a side view of Figure 8;

Fig. Io is a vertical section taken mainly along the line Io of Fig. 9 in the direction of the indicated arrows.

Description of preferred embodiments of the invention;

We now refer again to Fig. 1, where a typical heating furnace which is commonly used in the steel industry for the purposes already described. The furnace 15 comprises known to be a workpiece-supporting structure to which a plurality of vertically and spaced apart, water-cooled standpipes 16 includes, at the upper ends of a plurality is attached by spaced, water-cooled cross tubes 17, which are held in a known manner and extend transversely within the furnace. On these cross tubes namely at the upper, outer periphery, is again in well-known Manner, a plurality of spaced slide tubes 18 are attached, each extending in the longitudinal direction of the furnace and which are equipped with a slide 19 on which the workpieces, as shown at No. 14, are mounted and as they pass are held by the furnace, with the workpieces through a loading opening (not shown) on the insertion side of the furnace

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fed and removed from the furnace at the outlet (not shown) after heating has ended. For the reasons mentioned above it is highly desirable to use the various pipes of the support structure to surround with an outer layer of heat insulating material and also the side surfaces of the sliding tube belonging to Slide rail, so that only a small, outer, upper surface of the slide rail remains free, on which the workpieces as they pass rest by the oven.

According to what has been said above and as shown in Fig. 2, 3 and 4, there is an embodiment of the invention, which is specially designed for the insulation of standpipes or cross pipes of a heating furnace was developed, from a prefabricated, heat-insulating molding 20, with a body .22, which is made of a suitable, known, refractory insulating compound and with an inner, longitudinally extending channel 23 having a partially mainly cylindrical inner surface has, which in the present case is a half cylinder acts. One or more metal bands 25 are firmly connected to the refractory fitting at the time of manufacture, including expanding pins 32 are used as anchoring elements, as can be seen best in FIGS. 3 and 4, which essentially have a Show V-shaped design, with the lower loops attached to the outer surface of the metal bands 25 by welding the pins are and wherein the leg parts 34, which protrude from the loops 33 of the pins 32 to the outside, in heat-insulating refractory material can be embedded. The belt or belts have partially internal cylindrical surfaces 26, including one central part, which in the present embodiment is semi-cylindrical and half of the outer cylindrical surface of the pipe to be protected © and with end pieces 27 and 28

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is provided, which protrude on the central, partially cylindrical surface of the refractory fitting 21 to the outside. The inner, partially cylindrical surface of the channel 23 of the heat-insulating refractory molding corresponds essentially the outer peripheral surface of the or bands 25 so that they are flush with one another, which allows only limited flexibility of the refractory fitting when it is around a pipe was mounted.

As can best be seen in Fig. 2 and 4, a second prefabricated, heat-insulating, refractory shaped piece, as at 30, the same construction as the refractory, heat-insulating molding 20 described above, one or more metal strips attached as shown at 25 and which are provided with corresponding projecting legs 27 and 28. As the As shown in FIGS. 2 and 3, the legs 34 of the pins 32 preferably extend diagonally to the metal strips 26 trending levels.

When assembling the insulating, refractory fittings 20 and for the purpose of sheathing the pipe 16, the heat-insulating, Refractory pieces arranged so that the projecting ends 28 of the metal strips 25 in the heat-insulating, refractory molding 30 in an outer, overlapping position with respect to the outer end pieces

27 of the strips 25 of the heat-insulating, refractory molding 20 - the opposing, protruding end pieces

28 of the metal strips of the refractory fitting 20 turn into overlapping position in relation to the outwardly projecting end pieces 27 of the metal strips of the heat-insulating molding 30 are located.

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In the already mentioned assembly of the heat-insulating, fireproof Fittings 20 and 30 are the outwardly projecting parts 28 of the bands 25 of the refractory fitting 20 in an overlapping manner Position to the parts 27 of the bands 25 of the refractory piece 30 disclosed.

The heat insulating, refractory fittings 20 and 30 are with transverse, semicircular recesses 36 are provided, which when attaching the heat-insulating, refractory fittings to a Pipe form sufficiently large access openings 37 so that a suitable fastening tool can be inserted into the opening. The overlapping pieces 27 and 28 of the heat insulating, refractory Pieces 20 and 30 partially have anchors 44 for the purpose of clamping the parts around the outer surface of the pipe. The anchorages furthermore consist of a nut 45 which is welded to the outer surfaces of the opposite ends 27 of the clamp straps are attached, and a second element 46, which consists of bolts or screws or the like, which through Openings in the outwardly projecting ends 28 of the metal strips of the refractory, heat-insulating molding can be guided. When assembling the heat-insulating, refractory fittings around a pipe, a suitable tool is provided by the two of them opposite recesses 36 formed access openings 37 out to produce a threaded connection between the second anchoring element 46 and the first anchoring element 45, so the straps 25 located in the opposite position are clamped tightly around the outer periphery of the tube of the furnace and thereby a tight fit of the refractory fitting around the pipe is achieved. As indicated in Figs. 2 and 3, the adjoining end faces of the refractory fittings serviceable and interlocking protrusions on how

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48 and 49, so that the longitudinally mounted refractory fittings are assembled piece by piece as described above can be and completely encase the pipe in the longitudinal direction.

Should be any of the assembled refractory fittings If they fail or become damaged, these parts can be easily disassembled from the pipe by placing the refractory material in the Access openings as well as the anchors, which were loosened with a tool introduced to loosen the metal straps, removed and instead installing new heat-insulating refractory fittings in the manner described above.

In Figs. 5, 6 and 7 is another embodiment of the invention shown, which was specially developed for the sheathing of a furnace sliding tube, as shown at 18 in Fig. 1.

In Figs. 5, 6 and 7 an arrangement of three prefabricated ,, heat insulating, refractory fittings shown, namely a lower refractory fitting 50 and two upper prefabricated, refractory fittings 52 and 54 on opposite sides of the slide 19 and above the refractory fitting 50 are put on.

The lower refractory fitting 50, as before, consists of a prefabricated body made of heat-insulating, refractory material and has at least? a metal band 56 'on which. a plurality of anchors, such as the pins previously described in connection with Figs. 2, 3 and 4, are attached, which in turn are firmly connected to the loops 33 with the band 56 and which have protruding legs 34 which during the Manufacture of the refractory fitting to be embedded in the refractory material.

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As described, the metal band 56 has outwardly projecting end pieces 60 which extend beyond a plane, which runs through the longitudinal axis of the tube 18.

The two upper prefabricated, refractory parts 52 'and 54 are of similar construction and also have metal bands 63 which have internal, partially cylindrical surfaces corresponding to FIGS upper, outer surface of the sliding tubes 18. The bands 63 have, as already described, again anchoring elements, such as previously described pins, which are fastened with the tape, as already explained and from which legs 34 extend, which are embedded in the prefabricated, refractory part during manufacture. The refractory fittings 52 and 54 are provided with longitudinally extending inner edges which form a channel form for receiving the sliding tube 19.

The metal bands 63 are at their inner ends with protruding Extensions 65 are provided which are in an outer overlapping position with respect to the inwardly protruding ends of the metal strips 6o of the refractory fitting 50 attached below. The outwardly projecting ends of the metal strips 56 have first Fasteners, such as a nut 67 that is securely fastened to the outer surface of the metal band, which also includes the inwardly projecting ends 65 of the metal band 63, which lies outside the outwardly projecting end 67 of the metal strip 56. The anchorages also include second element 72, which can represent a bolt which can be guided through openings in the projection 70, for the purpose of Screw connection to the first anchorage, such as screw nut 67 of the metal band 56, to allow the metal band to be suspended reach, and through a ritter for the purpose of connection with the sliding tube.

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For this purpose, the refractory fittings 50 and the pieces 52 and 54 are in turn with corresponding, opposite to each other, half cylindrical see recesses 75, 76 and 77 provided, which, after fastening the individual pieces, form access openings around the sliding tube, which are shown as 8o. In the previously construction described, the various refractory fittings 5o, 52 and 54 around the sliding tube, as shown in Fig. 7, assembled and a suitable tool is passed through the access openings to secure the bolts 72 with the nuts 67 and connecting the inner pin ends to the slide tube so that the metal straps 63 are firmly clamped around the upper circumference of the slide tube will. After the metal straps are secured around the sliding tube, the access openings 80 are made with a suitable one heat-insulating, refractory material filled so that the sliding tube is then completely enveloped and only the upper surface of the slide rail is uncovered, on which, as described above, the workpieces rest for the purpose of transport through the furnace.

Another embodiment of the invention is shown in Figs. 8, 9 and 10 reproduced, which is also a special construction that is used for the insulation of slide rails of a heating furnace is provided.

The construction described in the last-mentioned figure consists of a lower, prefabricated, heat-insulating shaped piece 90 of a construction similar to that of shaped piece 5o, which was described in FIGS. 5, 6 and 7.

In the construction under consideration, the clamping bands 56 are fastened to the sliding tubes, which are made of bolts, by anchoring elements Io2 and screw nuts Io3 are made and attached to the outer surfaces of the

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Projections 91 are attached, which are located above the horizontal plane of the pipe 19. After the clamping straps are attached to the pipe, a heat-insulating refractory material 92 is applied by hand between the slide rails and the upper longitudinally extending edges of the lower refractory fitting 90 leaving only the upper part of the surface of the slide rail free to support the workpieces as they pass through the furnace. The clamping straps 56 may be provided with outwardly extending anchor pins 94; which are embedded in the refractory material »As already noted, the pin anchors for the lower, refractory fitting 90 are already embedded in the mass during the manufacture of the preformed, refractory fitting = on the other hand, the anchor pins 94, which are located at the end of the clamping band 56 , embedded in the refractory material after the ^ Filling was made of the refractory material at the upper end of the tube between the slide and the aforesaid ₉ extending in the longitudinal direction of the lower edge _s refractory mold piece 90 '

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Claims (11)

Claims; 1. A heat insulating cladding for a water-cooled pipe of a pre-heating furnace or a similar furnace type, consisting of an outer, prefabricated, heat-insulating, refractory fitting, the inner one. In. the longitudinal direction of the furnace pipe extending channel and is represented as an inner, partially predominantly cylindrical surface, a metal band located inside this channel surface, which also "has an inner, partially cylindrical surface and an outer, partially cylindrical surface, anchoring elements j the the Metaliband are attached and which have projections which are embedded in the insulating molding which the metal strip are connected old with the purpose of the metal strip with the insulating molded piece to connect, and Befestigungselementej and which serve the aforementioned metal strip with the tubular construction of the furnace so su connect that the inner, partially cylindrical surface of the Metailband comes into close contact with parts of the outer surface of the support tube and that the outer surface of said band is in alignment with the inner, partially cylindrical surface of the heat-insulating, refractory Formst ückes is. 2. The heat insulating member according to claim 1, wherein said anchoring elements comprise V-shaped pins which have a lower loop and in which said projections are formed by legs extending from the loop and with the pins at the points of curvature of the loop are firmly connected to the metal band. - 15 409886/1063 3. The heat insulating component according to claim 2, wherein the leg pieces of said anchorage lie in one plane, which runs obliquely outwards from the outer surface of the metal strip. 4. A heat-insulating component for the water-cooled pipe construction of a heating furnace or a similar furnace, consisting of first and second outer, prefabricated, heat-insulating, refractory fittings, which have opposing channels, which extend through essentially semi-cylindrical surfaces extending in the longitudinal direction of the pipes of the furnace a metal strip in opposite position in each of said refractory fittings having inner, partially cylindrical surfaces and outer, partially cylindrical surfaces, each inner surface of said metal strip being substantially half the outer cylindrical surface of the tubes and the outer surfaces of said metal strip essentially correspond to the hd-bzylindri see surfaces of the channels of the heat-insulating, refractory shaped pieces, anchoring elements for said metal strips, which have leg-like parts that are in the refractory shape With the purpose of firmly connecting said metal strips to the insulating fittings, anchor elements are embedded on said metal strips for fastening them to the tubular structures of the furnace, the inner partially cylindrical surfaces of the strips in close contact with the outer surfaces of said tubular structure and the outer surfaces of said bands are flush with the inner, semi-cylindrical surfaces of the heat insulating refractory fittings, so that the outer surface of the pipe structure is largely protected. - 16 409886/1063 5. Heat insulating component according to claim 4, characterized by said metal strips which have end pieces that extend to protrude beyond the partially cylindrical, inner surface, wherein opposing end pieces of opposing metal bands are in an overlapping position, and said refractory fittings face each other have low recesses in order to provide access openings to the overlapping end pieces of said metal strips which are fasteners, which consist of first elements that are attached to the outer surfaces of the inside end pieces of the bands are attached and those on the outward end pieces of the opposite bands are located, as well as second fasteners, which through the openings in the outward end pieces of the straps protrude for the purpose of fastening the first-mentioned fastening elements to the pipes of the furnace, after which Fix the access openings with a heat-insulating, refractory material to be filled. 6. A heat insulating component for a water-cooled, in Longitudinal pipe system, which also has a in the longitudinal direction, extending slide rail, which is located centrally on the outer, upper circumference of the pipe, consisting of a first, outer, prefabricated, heat-insulating ends, refractory fitting, the one inner, through a partially cylindrical surface has channel formed on the lower outer surface of the tube, a metal band in said channel of the refractory fitting, which has an inner, partially cylindrical surface, on this metal band firmly connected anchoring elements and limbs, which are in "- 17 409886/1063 the said refractory fitting are embedded for the purpose of more intimate Connection of said metal band to the thermally insulating fitting, said metal band, which outer end pieces has, which protrude from the inner, partially cylindrical surface to over a transverse through the longitudinal axis of the pipe structure of the furnace, and finally fastening elements on said outer end pieces of the Metal straps for fastening them to the pipes of the furnace, the inner surface of said straps being in solid In contact with the lower, outer surface of the tubes. 7. The heat-insulating component according to claim 6, characterized by second and third heat-insulating, refractory fittings, each of which has one of internal, partially cylindrical surfaces formed channel has for the purpose of fastening parts on the outer surfaces of the pipe and on the opposite Sides of the slide rail of the pipe above the lower surface of the pipe. 8. The heat insulating member according to claim 7, wherein pin-like Anchoring elements protrude from the ends of the strips and which in said, second and third, refractory, heat-insulating fittings are embedded. 9. The heat insulating member of claim 7, wherein said second and third heat insulating refractory fittings each has a metal band for itself, which is firmly connected to them and which has partially cylindrical surfaces . - 18- 409886/1063 for attaching these parts to the upper, outer surfaces of the said pipes on the opposite sides the slide rail of the pipe. 10. The heat insulating component according to claim 6, in which opposite one another Recesses are provided in said first, second and third refractory fittings to close access openings to form said fasteners for the purpose of securely attaching the first, second and third refractory fittings to the To attach the tubular structure of the furnace. 11. The heat insulating member according to claim 10, wherein the said access openings are filled with heat-insulating, fireproof material after assembly. 409886/1063 Blank page