JPH0345945Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field: The present invention per se relates to a structure for increasing the durability of a refractory coated with a tubular object.

Background of the invention: Skids, which are a combination of movable beams and fixed beams, are often used to continuously support and move heated steel materials in heating furnaces. The structure minimizes the influence of heat when moving high-temperature heated steel materials, and the skid pipe, which is the main structure of the skid, is coated and insulated to withstand high-temperature atmospheres, and is water-cooled.

BACKGROUND OF THE INVENTION Protective refractories, which are insulation coatings for tubular objects such as cooling pipes, such as those described above, are constructed with various shapes, characteristics, and construction methods. A cross section of a skid used in a typical conventional high-temperature furnace or the like is shown in FIG. This device is equipped with a skid button 1 that supports the heated steel plate with a very small contact surface at a required part of the upper surface of a skid pipe 2 through which cooling water flows, and is further assisted by studs 3 installed in the skid pipe 2 to spread the heating steel plate over the entire circumferential surface. A coated refractory material 13 is attached by adhesive. The coated refractory 13 is constructed by assembling a formwork, including the studs 3, around the skid pipe 2 and casting a monolithic refractory. In addition, in order to shorten construction time, reduce construction costs, and expand adaptability to various types of tubular objects, pipe 2
A construction method has also been adopted in which a heat insulating block of appropriate length is attached to the outer peripheral surface of the skid pipe 2, which is divided along the pipe axis direction. For example, as shown in FIG. 4, there is an upper covering refractory 14 of a block body in which a refractory is bonded to the upper support metal fitting 7 via studs 3, and a lower covering refractory 15 which is also bonded to the lower support metal fitting 7'. and fit it into the skid pipe 2. Then, it is attached to the skid pipe 2 with bolts 8 at the overlapping portions of the supporting hardware 7 and 7', and the attachment location is filled with stamp material 9. Jitsukai 1978-
Such construction means are also disclosed in No. 84546 or Utility Model Publication No. 55-33104.

However, the structures of coated refractories based on these construction methods have difficulties in being applied to heating furnaces.
That is, scale and the like drip onto the upper half of the coated refractory 13 or the upper coated refractory 14 while the heated steel material is being moved as a skid. This dripping scale first adheres to the upper surface of the coated refractory, and as the amount increases, it gradually flows down the surface while corroding the coated refractory and reaches the lower surface of the coated refractory, so that the scale etc. spreads over the entire surface of the refractory. This caused corrosion, penetration and structural spalling due to the adhesion of refractories, which caused problems such as breakage when replacing and removing coated refractories.

Problems with the invention: The present invention was made to solve these problems. Even if scale, slag, etc. drip, the scale, etc. is immediately dropped from the upper half of the coated refractory, so that the coated refractory can be easily removed. Starting from the bottom half of the object,
The object of the present invention is to provide a coated refractory which is prevented from flowing down onto a lower structure such as a support post, and which prevents erosion of at least the lower surface of the coated refractory. The ultimate goal is to create a coated refractory with a structure that eliminates damage due to erosion and improves durability.

Structure and operation of the invention: The structure of the invention will be explained below. In coated refractories that insulate and protect tubular objects such as cooling pipes in furnaces where scale, slag, etc. drip from heated steel materials, the effective width of the upper region formed by the curved or flat surface of the coated refractory is equal to the effective width of the lower region. The upper coated refractory is made into a so-called capstone-like state (hereinafter referred to as capstone shape) that is larger than the effective width, and the upper coated refractory is replaced by the lower coated refractory (if there is only one coated refractory, the upper half and the lower half) ), a step is formed in which the eaves protrude in the direction of flow of scale, etc.

A coated refractory with such a cross-sectional structure can protect the lower coated refractory from viscous fluid even if scale, slag, etc. drip, due to the edge-cutting effect of the step eaves formed by making the upper coated refractory into a capstone shape. Flow onto objects is prevented. Therefore, corrosion due to adhesion of scale, slag, etc. on the lower refractories or support posts is eliminated.

Embodiment: Next, one embodiment of the present invention will be described based on the drawings. As shown in FIG. 1, the construction of the coated refractory by pouring is almost the same as the conventional example shown in FIG. 3, for example. That is, on the outer periphery of the skid pipe 3 provided with the skid buttons 1 and studs 3, the upper coated refractory 4 forms a capstone-like shape with respect to the lower coated refractory 5, forming a coated refractory having a stepped eaves section 6 between them. . Such a refractory structure uses a formwork in which the actual length of the upper covering refractory 4 is made larger than that of the lower covering refractory 5, and a border cut portion serving as a stepped eaves is created between the two. The building will be constructed using cast molding. In this case, the step eaves 6 at the boundary between the upper and lower coated refractories
The length of the overhanging side is set in the range of 10 mm or more to about 120 mm, preferably 15 to 70 mm, considering the strength and handling of the coated refractory whose upper and lower parts are integrated. In addition, the inclination of the overhanging side of the stepped eaves part 6 may be selected within the range of 30 to 90 degrees with respect to the vertical line, depending on the properties and amount of the scale, etc., and by setting it to 60 to 85 degrees. Lower coating refractories such as scale and slag 5
The flow was prevented.

FIG. 2 shows another embodiment in which coated refractories are fitted together as blocks. In this embodiment, the capstone-shaped upper covering refractory 4 and the lower covering refractory 5 covered therewith match the upper and lower outer circumferential surfaces of the skid pipe 2, respectively, and
Support metal fittings 7 and 7' in which a large number of studs 3 are installed
are prepared, and a refractory material is filled and molded into a formwork suitable for the upper covering refractory material 4 or the lower covering refractory material 5 assembled to these supporting metal fittings 7, 7'.
The length of each coated refractory block in the tube axis direction is set in accordance with the spacing between the skid buttons 1, 1.

To construct the skid pipe 2, fit the upper coating refractory 4 and the lower coating refractory 5 to the skid pipe 2 using the supporting metal fittings 7 and 7', and using bolts 8 through the supporting metal fittings 7 and 7'. Fix it to skid pipe 2. By filling the mounting and fixing locations with stamp material 9, a tubular material-coated refractory having the structure of the present invention can be obtained.

Effects of the invention: The structure shown in Fig. 2 was applied to an actual furnace, with the length of the overhanging side of the step eaves section 6 being 30 mm and the overhang angle of inclination being 70 degrees. As a result of the trial, the flow of scale dripping from the heated steel material ends at the stepped eave of the capstone-shaped upper coating refractory, and drips directly from the edge of that part to the hearth, and scale adhesion to the lower coating refractory is drastically reduced. Also, erosion has decreased significantly. At the same time, wear and tear on the lower structure such as the support post is also prevented. Furthermore, because scale and other particles immediately drip from the stepped eaves, they flow faster on the surface of the upper coated refractory, reducing adhesion and reducing erosion in this area, contributing to improved durability.

As a result, the service life of the lower coating refractory or its equivalent area was approximately tripled, and the life of the coating refractory as a whole was extended.

Viewed in this way, the effect of the present invention is advantageous when constructing a refractory coated with a tubular material by dividing it into an upper block and a lower block, and is especially effective in preventing wear and tear at the joint section at the bottom of the stepped eave. It is highly effective and has great industrial applicability.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of one embodiment of the present invention;
The figure is a cross-sectional view of another embodiment, and FIGS. 3 and 4 are views showing a conventional example. 1... Skidded button, 2... Skidded pipe, 3... Stud, 4... Top covering refractory, 5
... Lower coating refractory, 6 ... Step eave part, 7, 7'
...Support hardware, 8...Bolt, 9...Stamp material, 13...Coated refractory, 14...Top coated refractory, 15...Bottom coated refractory.

Claims (1)

[Scope of Claim for Utility Model Registration] In a coated refractory that insulates and protects tubes in a furnace where scale, slag, etc. drip, the upper coated refractory or equivalent coated refractory area is replaced with the lower coated refractory or A structure of a tubular article-coated refractory characterized by forming a capstone-like shape in a corresponding area of the coated refractory, and creating a stepped eave section in the direction of flow of scale, slag, etc.