JPS58193316A - Skid pipe - Google Patents

Abstract

PURPOSE:To prevent the heat loss of a heating furnace, by a method wherein a heat resistant ceramic figurate material excellent in strength is fixed to the interior of the main body of a skid pipe used in a steel material heating furnace by an amorphous refractory material and the outer peripheral surface of said main body of the skid pipe is covered with a heat insulating cast layer to eliminate the cooling of the skid pipe by water. CONSTITUTION:The outer peripheral surface of a hollow steel pipe main body 2 constituting a skid pipe used in a steel material heating furnace is covered with a cast layer 3 comprising a usual heat insulating material and, at the same time, a heat resistant ceramic figurate material 50 comprising a SiC type, an Al2O3 type or a ZrO2 type refractory material is inserted into the hollow interior part of said pipe main body 2 to be fixed to the interior of said pipe by an Al2O3- SiO2 type castable refractory material. The length of this figurate material 50 is adjusted so as to position the joint part thereof above adjacent support posts C1, C2 of the skid pipe. This skid pipe has strength even if cooling by water is not carried out and, therefore, the heat loss of the heating furnace due to cooling by water is eliminated.

Description

[Detailed description of the invention] The present invention relates to skid pipes.

In a heating furnace or the like, a skid pipe for loading and transferring a material to be treated such as a slab is generally constructed using a skid pipe body (2) with a skid rider or rail (1) attached to its outer periphery, as shown in Fig. 12. The surface is covered with a heat insulating caster arc 3), and the cooling water is allowed to flow through the hollow hole (4), which is supported by the struts (0) and placed inside the furnace. 1) Place the material to be treated (S
) is placed. The temperature inside the furnace is, for example, 1300 to 1
Although the temperature of the pipe body (2) is extremely high at 350'O, due to the cooling effect of the cooling water, the temperature of the pipe body (2) is, for example, i o o''
c or less, and the strength to withstand its own weight and the weight of the object to be processed (S) on the rider (1) is maintained without softening.

However, on the other hand, the heat inside the furnace is
There is a drawback that heat is transmitted from 1) to the pipe body (2) and carried out of the furnace by cooling water, and the heat loss is approximately 5 to IOZ of the total amount of thermal energy input into the furnace.

Or even more. If the amount of cooling water is suppressed in an attempt to reduce this heat loss, the cooling effect will be insufficient and the pipe body (2) will soften and buckle, making it unable to function as a skid pipe.

The present invention has been made in view of the above, and provides a skind pipe that eliminates the use of cooling water and substantially causes no heat loss through a combination of a skid pipe body and a refractory material.

In the skind pipe of the present invention, the outer peripheral surface of the skind pipe body is covered with a single layer of heat-insulating casters, and a plurality of heat-resistant ceramic shaped members are placed in the hollow hole of the pipe body along the axial direction, the end surfaces of which are in contact with each other. They are connected in series and fixed in the hollow hole using a monolithic refractory.

The present invention will be explained in detail below.

FIG. 1 [■] is a front sectional view showing a specific example of the skind pipe of the present invention, and FIG. 1 is an AA sectional view thereof.

(Ton is a heat-resistant ceramic shaped material inserted into the hollow hole of the pipe body (2), and (6) is an unshaped refractory filled in the gap between the ceramic shaped material and the inner peripheral surface of the pipe body (2f). As shown in the figure, the skid pipe of the present invention has a pipe body (2) to which a rider (II) is attached, the outer peripheral surface of which is covered with a single layer of heat-insulating casters (3), and a hollow hole in the pipe body. Heat-resistant ceramic shaped material over the entire length of the inside - [(50・1), (50・2), (50・3)
...] are arranged in series so that their front and rear ends are in contact with each other, and the shaped ceramic material is fixed in the hollow hole with a monolithic refractory (6).

One layer of insulation casters (3) on the outer peripheral surface of the pipe body (2)
This prevents local heating of the main body due to the high-temperature atmosphere inside the furnace, and the caster material may be a material commonly used.

On the other hand, the shaped ceramic member @0) fixed in the hollow hole with the shaped refractory functions as a strength member.

That is, in the present invention, since cooling water is not used, the pipe body (2) is heated and softened due to the influence of heat in the furnace. It compensates for the drop, bears the load (its own weight and the weight of the material to be treated), and prevents buckling and deformation. Therefore, it is necessary for the ceramic shaped material to have high-temperature strength that can withstand the above-mentioned load. Such shaped ceramic materials include those made of silicon carbide (5iC).

Incidentally, a material containing about 80% or more of SiC has a high-temperature bending strength of about 300 to 9/cm2c at (1400°C). In addition, alumina-based and zirconia-based materials are also preferably used. As the monolithic refractory, for example, A1203-8iO2 type refractories are preferably used, but any other refractory that can firmly fix the shaped material (50) may be used.

As mentioned above, the ceramic shaped material (bO) acts as a strength member and bears most of the load of the skid pipe. It is most desirable that the skid pipe is a long body having a length such that it is located on the adjacent support columns (C1) and (C2), and that the skid pipe is arranged in such a positional relationship. That is, it is most preferable that the ceramic shaped material is an elongated body having a length corresponding to the distance between the supports. Further, depending on the length of the elongated body, the distance between the supports may be set to 150, for example.
One method is to set it to 0 to 2500+++m. Furthermore, it is advantageous in terms of strength that the cross-sectional area of the ceramic shaped material (50) in the direction perpendicular to the axis is as large as possible within the range that does not cause any problem in charging into the hollow hole of the pipe body. Needless to say. In addition to the rectangular parallelepiped with a rectangular cross section as shown in FIG. 1, the shape can be a cylinder (51) with a circular cross section or a hollow cylinder as shown in FIGS. 2 and 3. In the case of a hollow cylindrical body, the hollow portion may remain hollow, but it may also be filled with a monolithic refractory. Further, when the cross-sectional area of each ceramic shaped member is relatively small, a plurality of shaped ceramic members may be arranged in parallel in the hollow hole. Figure 4 shows a case where ceramic shaped materials (goods) with a flat rectangular cross section are arranged in two rows within the inner peripheral surface (2f) of the pipe body, and Figure 5 shows a ceramic shaped material (goods) with a small diameter circular cross section. An example is shown in which three lines are arranged. Of course, the number of these pieces in parallel may be increased or decreased as appropriate depending on the cross-sectional shape/dimensions and hollow hole diameter of each shaped ceramic member.

The skid pipe body (2) is fitted with a suitable heat-resistant steel groove. Its size is, for example, an inner diameter of about 300nQ1
The wall thickness may be 20wn. Although not shown, small diameter holes are dispersed in the peripheral wall of the /so 4f main body to facilitate the removal of moisture when drying the monolithic refractory (6) filled in the hollow hole. good.

For example, 4 to 6 holes each having a diameter of 3 to 10 mm are provided in the circumferential direction at a pitch of 100 mm.

By the way, due to the processing and forming technology of ceramic shaped materials,
There is a limit to the dimensions, and the length dimension is, for example, about 1600~
It is below 2000am. In that case, if the length does not reach the distance between the struts, two of these may be arranged in series in the axial direction between each strut. Generally, it is a short body with a flat rectangular cross section (for example, thickness 25 tm x height 240 a+m x length 800+++ m), and when using a shaped ceramic material with such a shape, it is as shown in Figs. 6 to 9. 2 or 3 rows depending on the thickness and the hollow hole diameter of the pipe body.
It is preferable to arrange them in rows or more, and to arrange them in the axial direction in the necessary number so that the joints (in each ceramic shaped material in adjacent rows) are different from each other. Figures 6 to 8 show adjacent rows of ceramic shaped materials (to) 1/1/2 of their length.
Fig. 9 shows an example in which the joints are shifted by 1.2 in the axial direction so that the joints do not overlap. This is an example in which the joints are sequentially shifted by 173 of the length so that the joints overlap. Of course, apply mortar or the like as appropriate to each of the above joints and between adjacent rows.

In this way, by arranging short ceramic shapes with a flat rectangular cross section inside the tR pipe so that the joints in each row are different from each other and fixing them with monolithic refractories, the skid pipe can be made from this material. It provides bending strength that allows it to maintain a predetermined shape against such loads (bending moments). Of course, even in that case, it goes without saying that it is more advantageous to have a smaller number of axially arranged elements.

Furthermore, when using a short ceramic shaped material with a flat rectangular cross section as described above, in order to withstand a larger load, the ceramic shaped material should have engaging protruding ends on both sides in the longitudinal direction. Preferably used.

FIGS. 10 and 11 show examples of the shape and arrangement of such shaped ceramic members. The ceramic shaped material shown in Fig. 10 has engaging protruding ends (+ga,
56b), and the respective protruding ends are engaged with each other and are connected in the axial direction. The example shown in FIG. 11 is centered around a T-shaped ceramic shaped material Gη having projecting ends (57a, 57b) on both sides, and a ceramic shaped material Gη having projecting ends similar to those described above on both sides. (PI, P2) is the fulcrum of the pillar (CI, C2) when placed in the furnace, and the T-shaped ceramic shaped member 67) is It is arranged so that it is located in the center between the pillars. Of course, in either case, it is necessary that the joints in adjacent rows are arranged in series in the axial direction so that they do not overlap but are different from each other. In this way, by using the ceramic shaped member having the protruding end portion for engagement, it is possible to withstand a larger bending moment.

As described above, the skid pipe of the present invention maintains the required high temperature strength and performs the original function of the skid pipe without using any cooling water. Therefore, the heat loss that occurs with conventional skid pipes that require cooling water is virtually zero. In this case, the heat loss of approximately 700×10 3 K (support)/h is eliminated, resulting in an extremely large energy saving effect.

[Brief explanation of drawings]

Fig. 1 [■] is a sectional view showing a specific example of the skid pipe of the present invention, the opening is a sectional view taken along line A-A, and Figs. 6 to 11 are perspective explanatory views showing examples of the shape and arrangement of short ceramic shaped members each having a flat rectangular cross section, and FIG. 12 [D shows a conventional skid pipe] The cross-sectional view (■) is the AA cross-sectional view. 1. Niskid rider, 2. Niskid pipe body, 3:
Insulating casters, 50.51.52.53.55.5
6.57-Ceramic shaped material, 2f: Pai agent Patent attorney Shinhachibe Miyazaki

Claims (1)

[Claims] +l) The outer peripheral surface of the skid pipe body to which the skid rider or rail is attached is covered with heat insulating casters, while the hollow jute of the skid pipe body has a plurality of casters along its axial direction. A skid pipe characterized in that heat-resistant ceramic shaped members are arranged in a row with their end faces in contact with each other, and are fixed in a hollow space with a monolithic refractory. (2) The skid pipe according to item +11, wherein the heat-resistant ceramic shaped material has a rectangular cross section. (3) The skid pipe according to item f1) above, wherein the heat-resistant ceramic shaped material has a solid cylindrical shape. (4) The skid pipe according to item (1) above, wherein the heat-resistant ceramic shaped material has a hollow cylindrical shape. (5) The skid pipe according to item (4) above, wherein the hollow holes of the heat-resistant ceramic shaped material are filled with an unshaped refractory. (6) The skid pipe according to any one of Items 11 to 5 above, wherein the heat-resistant ceramic shaped material has a length corresponding to the distance between the supports in the furnace. (7) The heat-resistant ceramic shaped material is a short body with a flat rectangular cross section, and is arranged in multiple rows in the hollow hole of the pipe body, and is arranged in series in the axial direction so that the joints of adjacent rows do not overlap. The skid pipe according to item (1) above, characterized in that: (8) Heat-resistant ceramic (Tsuku shaped material) has engagement protruding ends on both sides in the longitudinal direction, and the protruding ends are engaged with each other so as to be connected in the axial direction. The skid pipe according to item 6). (9) Item 1i) to item (7) above, wherein the heat-resistant ceramic shaped material is a silicon carbide refractory, an alumina refractory, or a zirconia refractory. A skid pipe as described in any one of the paragraphs.