JPS5958298A - Insulating molded member coating cooled pipe of furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an insulating molded member covering a cooled sliding tube, holding tube (4), or horizontal tube of a furnace, which is attached to the tube and divided into a plurality of vertically divided sections. The present invention relates to an insulating molded member made of molded bodies made of different refractory materials.

The provision of the necessary holding and conveying structures for the combustion chambers, heating zones and flues of various furnaces often requires forced cooling of the elements of these structures by means of air, water or steam.

For example, the hearth of a heating furnace (movable beam furnace, push-in continuous heating furnace, etc.) that is heated from above and below in the steel manufacturing industry consists of circular or square tubes, and when these tubes are horizontal, they are called sliding tubes,
It is called a holding pipe or a horizontal pipe, and if it is vertical it is called a standing pipe. When cooling these tubes, a distinction is made between low temperature cooling and high temperature cooling. In this case water or hot steam is passed through the entire pipe system.

However, the charge to be heated (
In order to prevent as much as possible the adverse effects of cooling pipes on sheets (laminates, ingots, plates, slabs, etc.), the pipes generally have to be coated (5), ie insulated. In addition to thermal stress,
Mechanical stresses caused by slag or scale erosion or tubing stretching, deflection and vibration must also be taken into account. On the other hand, there is also a requirement, especially in holding tubes and sliding tubes, for the thickness of the insulation coating of the tubes to be as small as possible, in order to minimize the shaded area under which the charge is heated.

Such insulating molded parts are described in U.S. Pat. The shaped part consists of a dense refractory material into which steel reinforcing pieces are embedded. These molded parts have a low coefficient of thermal insulation due to the high thermal conductivity of the dense refractory material. Furthermore, vibrations transmitted from the tubing to the steel reinforcement can destroy rigidly bonded, inelastic shaped parts.

In order to improve the thermal insulation coefficient, attempts have been made to use insulating molded parts made of ceramic fiber mats (6). However, a thin pine i~ as an intermediate layer between the tube and the rigid molded part weakens the rigid molded part on the one hand and increases the shadow area in the heated object on the other hand. Mats made of ceramic fibers alone cannot provide sufficient strength and vibration stability.

The object of the invention is to design an insulating molded part of the first type in such a way that it can be designed according to the stresses in the individual circumferential region of the tube and can be easily installed or removed.

According to the invention, this problem is solved in that the lower molding of the tube is made of a ceramic fiber material, the upper molding of the tube is made of a high-strength ceramic material, and the upper molding of the tube is made of a high-strength ceramic material. This is solved by covering the top of the molded body on the side. The molded body on the underside of the tube has a low thermal conductivity, a high heat storage capacity, high stability against temperature fluctuations and a low weight. Furthermore, the structure is not rigid and has some degree of flexibility. Therefore, the lower molded body is not affected by the vibrations of the tube (7). The upper compact is resistant to scale and slag attack and protects the lower compact from such attack. 4. The upper compact is preferably based on alumina silicate, arsenic carbonate, magnesite, etc. Fire resistant made of materials.

In a preferred configuration of the invention, the lower molded body of the tube has a diameter of 180 mm.
It extends around the tube for preferably about 2400° above 6° but below 2706°C, with the upper profile of the tube reaching as far as the vertical tangential plane of the lower profile of the tube. As a result, the particularly thermally insulating profile on the bottom side of the tube extends completely around a large part of the tube, while the profile on the upper side of the tube completely covers the top of the profile on the bottom side of the tube. As a result, the lower compact is substantially protected against scale and slag attack. To improve the thermal insulation in the area of the upper molding,
A plurality of fins are formed on the upper molding on the side closer to the tube;
Ceramic fiber strips or the like are inserted between these fins.

In a preferred embodiment of the invention, a flange plate is welded to the tube as a support piece for the upper profile. (8) As a result, the upper molded body applies a load to the lower molded body, and both molded bodies can be exchanged independently of each other.

Since the lower molded body only has to bear a small amount of its own weight, it is glued to the tube with cold-curing open-hole cement 1 or an adhesive. The attachment of the lower profile to the tube can also be held by means.

In the configuration of the present invention, the reinforcing piece is embedded in the lower molded body. In this case, the reinforcing piece preferably has a rectangular plate, which fits into a U-shaped strap attached to the tube in order to hold the molded body in the tube.

The lower molded body is preferably annealed before attachment, so that it does not shrink or shrinks only slightly when subjected to thermal stresses.

Open seams and thermal short circuits are thereby avoided.

In order to significantly prevent seizure of the charge or slag, the upper molding is preferably designed in the form of a gable roof.

In the configuration of the present invention, two (9) A symmetrical upper molding and a lower molding are provided.

Other configurations of the invention will become apparent from the description of the exemplary embodiments shown in the drawings and from other embodiments of the claims.

A tube 1 extending horizontally within the combustion chamber has a mounting protrusion 2 for placing a heated object thereon. A cooling medium flows through the tube 1 .

Two radial width strips 3 are attached to the outside of the tube 1, each extending upwardly at an angle W of approximately 30 DEG (FIG. 1) with respect to a horizontal plane passing through the center of the tube 1. Overhang piece 3
Above are the upper moldings 4 and 5 of the tube, respectively.

These molded bodies 4 and 5 form a gable roof (FIG. 3). In the area of the mounting projection 2, the molded bodies 4 and 5 have corresponding notches 6 and 7 (FIG. 2).
. The upper moldings 4 and 5 have fins 8, 9 and 10.11 on their underside, between fins 8 and 9 and between fins 10 and II.
An insulating layer 12 made of ceramic fiber strips is provided between them (FIG. 1).

(10) The molded bodies 4 and 5 are made of KmM abrasive, dense-sided, four-hole material based on alumina silicate, silicon carbide, magnesite, etc.

The insulating molding 11 also has two moldings 13 and 14 on the underside of the tube. These molded bodies 13 and 14
is made from ceramic fiber #:moon and therefore has a lower thermal conductivity and a smaller heat storage capacity compared to the upper moldings 4 and 5.

The lower bodies 13 and 14 of the tube are each made in one piece by vacuum forming and subsequently annealed, with a protective coating on the stressed outer surface (FIGS. 4 and 5). This protective coating can be provided on silicon carbide or alumina or on the filler. In either case, this coating film is curable at room temperature.

The lower profiles 13 and 14 can also be formed from individual strips 15 (FIGS. 6 and 7). In this case annealing is not necessary. The external surface subject to stress is provided with a protective layer (coating) as described above.

(11) The two lower molded bodies 13 and 14 abut each other at the separation surface 16. One of the lower molded bodies 13 is butted against one of the upper molded bodies 4 at the separation surface 17, and the other lower molded body 1
4 is butted against the other upper molded body 5 at the separation surface 18. In order to make the separation planes 17 and 18 as narrow as possible,
The molded bodies 13 and 14 have an overhang piece 3 and a stepped recess 1 into which the clay is fitted.
I have 9 and 20.

In order to completely cover the moldings 13 and 14 from above, the edges 4' and 5' of the upper moldings 4 and 5 cover the lower molding 13.
and 14 to the vertical tangent plane T.

Separation surface 16, top edge seam 21 between image forming bodies 4.5, seam formed between notches 6 and 7 and mounting projection 2,
and the butt seam of the formed body in the longitudinal direction of the tube,
Bonded with fireproof cement.

The length of the individual shaped bodies 4.5.13.14 is designed such that preferably three shaped bodies are used for every meter of tube.

(12) In order to increase the stability of the lower molded bodies 13 and 14, metal reinforcing pieces 22 are embedded in these molded bodies in the embodiments according to FIGS. 1, 5 and 7.

The molded bodies 13 and 14 can be glued directly to the tube 1 with a cold-curing adhesive. However, these molded bodies can also be mechanically attached to the tube 1 by means of members. Such attachment is illustrated in FIGS. 8-11.

In the embodiment according to FIGS. 8 to 10, a U-shaped retaining strap 23 is welded to the tube l, into which a square plate 24 is inserted.

In the embodiment according to FIG. 8, the rectangular plate 24 has tubes l
The molded bodies 13 and 14 have nails 25 and 26 extending in the longitudinal direction, and these nails 25 and 26 are pierced into the parts of the molded bodies 13 and 14. The rectangular plate 24 thereby holds two longitudinally adjacent molded bodies 3 or 14 with their end faces facing each other. The movability of the square plate 24 in the U-shaped retaining strap 23 ensures compensation of length tolerances.

(13) In the embodiment according to FIGS. 9 and 1O, the square plate 24 has tubular sleeves 27 projecting from both sides in the longitudinal direction of the tube.
is installed. This tubular sleeve 27 consists of two longitudinally adjacent molded bodies 13 and ]4.
reinforcing rods 22 are designed to fit into this sleeve 27 from both sides. This restraint is recommended above all if the insulating molded part is subjected to particularly strong vibrations.

In the embodiment shown in FIG. 11, a lock 28 is provided on the outside of the pipe 1, and molded bodies 13 and 14 having a stretched wire mesh 29 with bending rigidity, a perforated plate, etc. inside are hooked onto this lock 28. .

The moldings 4 and 5 on the upper side of the tube and the moldings 13 and 14 on the lower side of the tube are replaced independently of each other when worn. The upper molded bodies 4 and 5 are held by the overhang piece 3 without applying any load to the lower molded bodies 13 and 14. Therefore, the upper moldings 4 and 5 can be removed from the overhanging piece 3 and replaced without removing the lower moldings 13 and 14 (14
)! Ru. The lower molded bodies 13 and 14 are also replaced separately accordingly.

The upper moldings 4 and 5 are extremely resistant to slag attack and protect the lower moldings 13 and 14 from slag attack. The lower profiles 13 and 14 primarily take care of the thermal insulation of the tube 1.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a part of the tube with the insulating molded member, Figure 2 is a bottom view of the upper molded body of the tube as seen in the direction of arrow A in Figure 3, and Figure 3 is the upper molded body. 4 is a perspective view of the lower compact of the vacuum formed tube; FIG. 5 is a perspective view of the compact of FIG. 4 with embedded reinforcing strips; FIG. 6 is a perspective view of the compact of FIG. FIG. 7 is a perspective view of a lower molded body similar to FIG. 6 with a different lamination of strips and embedded reinforcing pieces; FIG. 8 is a perspective view of a lower molded body made up of strips; FIG. FIG. 9 is a perspective view showing the installation of the lower molded body with an embedded reinforcing piece, FIG. 10 is an enlarged perspective view of the device shown in FIG. 9, and FIG. The figure is a perspective view showing another attachment of the lower molded body. 1... Pipe, 4, 5... Molded body on the upper side of the tube, 13°I
4... Molded body on the lower side of the tube. Patent Applicant: Dedayeluverke Akchen I 550-

Claims (1)

[Scope of Claims] ] An insulating molded member covering a cooling sliding tube, holding tube or horizontal tube of a furnace is composed of a plurality of refractory material molded bodies attached to the tube and divided vertically. , the lower profile of the tube (13, 14) is formed from a ceramic fiber material and the upper profile of the tube (4, 5) is made of a high-strength ceramic material; (13,1
4) An insulating molded member covering the cooled pipes of the furnace, characterized in that it covers the top. 2 The lower molded body (13, 14) of the tube extends around the tube (1) for a distance of 1 so'C or more but 2708 C or less, preferably about 240'e, and the upper molded body (415
> is the vertical tangential plane (
The insulating molded member according to claim 1, characterized in that the insulating molded member extends to point T). 3. Insulating molded part according to claim 1 or 2, characterized in that the upper molded body (4, 5) of the tube is free of steel reinforcing pieces. 4 The upper molded body (4, 5) of the tube has a plurality of fins (8 to 11) on the side closer to the tube (1), and these fins (
4. Insulating molded part according to claim 1, characterized in that ceramic strips (12) are inserted between the parts 8 to 11). 5. The insulating molded member according to any one of claims 1 to 4, characterized in that the molded bodies (4, 5) on the upper side of the tube are formed in the shape of a gable roof. 6 Two symmetrical molded bodies on the upper side of the tube when viewed in the circumferential direction of the tube (
4, 5). The insulating molded member according to any one of claims 1 to 5. 7. The insulating molded member according to claim 1, characterized in that the pipe (1) has an overhanging piece (3) as a support piece for the molded body (4, 5) on the upper side of the pipe (2). . 8. The insulating molded member according to claim 1 or 2, wherein the molded body (13, 14) on the lower side of the tube is a molded body vacuum-formed from a fiber material. 9. The insulating molded member according to claim 8, characterized in that the molded bodies (13, 14) are annealed. 10. The insulating molded member according to claim 1 or 2, characterized in that the molded body (13, 14) on the lower side of the tube is composed of a fiber strip (15). ll Two symmetrical pipe lower molded bodies when viewed in the circumferential direction of the pipe (
13, 14) The insulating molded portion 8゜12 according to claim 1, 2, 8, or 10 is provided with a molded body on the lower side of the pipe ( 13, +4) has a metal reinforcing piece (22, 29) (3) Claim 1 or 2 or 8
The insulating molded member according to item 1 or item 1θ or item 11. 13 The pipe (1) is installed by means (23, 24, 27, 2
8), and the means for this installation is a metal reinforcing piece (22°29
) Claim 1
The insulating molded member according to item 2. 14. Claim 1 or 2 or 8 or 1O or 12, characterized in that the molded body (13, 14) on the lower side of the tube is glued to the tube (1). The insulating molded member described in . 15. Claim 1, characterized in that the lower moldings (13, 14) of the tube are attached to the tube (1) by means of nails (25, 26) attached to the tube (1). Alternatively, the insulating molded member according to item 2, item 8, item 1O, or item 12.