JP4041904B2 - Pipe member for heating furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe member for a heating furnace that can exhibit an excellent heat insulating effect over a long period of time.
[0002]
[Prior art]
A large number of heating furnaces are used in an iron factory, and various pipe members exist in the heating furnace. For example, there are a skid pipe in a walking beam type heating furnace and a cooling pipe attached to a partition plate of a heating furnace for a plating line. On the other hand, these pipes are usually covered with a heat insulating material for the purpose of preventing deformation due to heat and preventing heat loss from the pipe.
Specifically, as shown in FIG. 8, a soft ceramic fiber blanket 20 is punched into a partially cut ring shape, and the cut portion 22 is formed using the flexibility of the obtained ring-shaped heat insulating material 21. After spreading and mounting on the outer periphery of the pipe, the cutting portion 22 was closed to form a ring shape, and this was repeated to mount the heat insulating material 21 on the stack, thereby covering the entire pipe.
[0003]
However, since the ring-shaped heat insulating material 21 as described above is a soft material, when it is used for a long time at a high temperature, a drop phenomenon may occur due to its own weight or shrinkage due to sintering. As a result, there is a problem that the pipe is exposed and heat flows in from there to cause deformation of the pipe or heat loss from the pipe.
Furthermore, a large amount of residual material of the ceramic fiber blanket after punching the ring-shaped heat insulating material 21 is generated, but since this residual material has no means for reuse, a large amount of waste material is generated, The handling was a problem.
[0004]
[Problems to be solved by the invention]
The present invention solves the conventional problems as described above, exhibits an excellent heat insulating effect, and also exhibits a stable heat insulating effect over a long period of time without being lowered due to its own weight even when used at high temperatures. Furthermore, it is possible to provide a pipe member for a heating furnace that can recycle the remaining material of the ceramic fiber blanket, prevent the generation of the waste material, and can greatly reduce the manufacturing cost. It was completed as.
[0005]
[Means for Solving the Problems]
The pipe member for a heating furnace of the present invention made to solve the above-described problem is a plurality of pipes having outer circumferential surfaces of a pipe body made of ceramic fibers made of alumina fibers, and formed with engaging grooves and engaging convex portions. The circumferentially divided pieces are covered with a ring-shaped heat insulating material that is combined and integrated so that the engaging groove and the engaging convex portion engage with each other.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
The drawings show a case where the present invention is applied to a skid pipe in a walking beam type heating furnace. In FIG. 2, 10 is a heating furnace, 11 is a steel plate, 1 is a pipe body of a walking beam, and 1a is a fixed pipe. Further, as shown in FIG. 3, the outer periphery of the pipe body 1 is basically the same as the conventional one in that the ring-shaped heat insulating material 2 is stacked and covered.
[0007]
And in this invention, the said ring-shaped heat insulating material 2 is made into the hard thing vacuum-formed with the hard ceramic fiber. As the heat insulating material made of this hard ceramic fiber, a material having a density of 210 kg / m ³ and a load shrinkage of about 5% (shrinkage after 24 hours at 1400 ° C. under a load of 60 kg / m ² ) is used. It is done.
In the case of a conventional soft ceramic fiber blanket, the density is 150 kg / m ³ and the load shrinkage is about 13%. When used for one month to one year, a falling phenomenon of 10 to 15 mm occurred due to its own weight or sintering. On the other hand, in the case of the heat insulating material of the present invention, it has been confirmed that even if it is used for one year or longer, no drop phenomenon is observed and excellent heat insulating properties can be maintained.
[0008]
Moreover, the said ring-shaped heat insulating material 2 shall be integrated by combining several circumferential direction division | segmentation piece 2a, 2b. This is a structure in which the conventional one uses the flexibility to widen the cutting portion and attach it to the outer periphery of the pipe. I can't. Therefore, as a combination type in which a plurality of circumferentially divided pieces 2a and 2b are combined, the structure is such that the circumferentially divided pieces 2a and 2b are combined and integrated on the outer periphery of the pipe body 1 so that the pipe is not deformed. The mounting to the main body 1 is realized.
[0009]
As a specific combination structure, for example, as shown in FIGS. 1 and 4, a ring-shaped heat insulating material 2 having an inner diameter equal to the outer diameter of the pipe body 1 is composed of two divided pieces 2a and 2b. The engagement groove 3a is formed in the divided piece 2a, while the engagement protrusion 3b is formed in the division piece 2b, and the engagement groove 3a and the engagement protrusion 3b are engaged and integrated. be able to. Further, as shown in FIGS. 5 and 6, each of the divided pieces 2a and 2b can be shaped to be point-symmetric and have an engaging groove 3a and an engaging convex portion 3b. Further, as shown in FIG. 7, it is possible to make the engagement portion more rounded by making the engagement portion rounder. In addition, it is needless to say that the design can be changed as necessary, for example, to form three or more divided pieces and to make the shapes of the engagement grooves 3a and the engagement protrusions 3b arbitrary.
[0010]
Furthermore, the said ring-shaped heat insulating material 2 can also be manufactured from the recycling remaining material.
In the case of a conventional soft ceramic fiber blanket, there is no effective method for reusing the remaining material at the present time, and therefore, there has been no choice but to dispose of it as waste material. However, in the present invention, the heat insulating material 2 is vacuum-formed with a hard ceramic fiber made of alumina fiber or the like, and the hard ceramic fiber can be recycled. Therefore, the remaining material after punching can be reused any number of times without being discarded, so that the material is not wasted and the manufacturing cost of the heat insulating material 2 can be drastically reduced.
[0011]
Thus, this invention is the structure which coat | covered the outer peripheral surface of the pipe main body 1 with the ring-shaped heat insulating material 2 which combined and integrated several circumferential direction division | segmentation piece 2a, 2b which consists of a hard ceramic fiber, It can prevent the falling phenomenon of the heat insulating material and exhibit a stable heat insulating effect over a long period of time. Moreover, since it is a combination type structure, it is excellent in mounting property to the pipe body, and the mounting operation can be completed in a short time.
[0012]
【The invention's effect】
As is clear from the above description, the present invention exhibits an excellent heat insulating effect, and can exhibit a stable heat insulating effect over a long period without a drop phenomenon due to its own weight or the like even when used at a high temperature, Furthermore, it is possible to recycle the remaining material of the ceramic fiber blanket to prevent the generation of waste material, and to greatly reduce the manufacturing cost.
Therefore, the present invention greatly contributes to the development of the industry as a pipe member for a heating furnace that eliminates the conventional problems.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of the present invention.
FIG. 2 is a front view showing a walking beam heating furnace.
3 is a perspective view showing a pipe member in FIG. 2. FIG.
FIG. 4 is a plan view showing an example of a heat insulating material.
FIG. 5 is a plan view showing another example of a heat insulating material.
6 is an exploded plan view of the heat insulating material of FIG. 5. FIG.
FIG. 7 is a plan view showing another example of a heat insulating material.
FIG. 8 is a perspective view showing a manufacturing process of a conventional ring-shaped heat insulating material.
[Explanation of symbols]
1 Pipe body 2 Ring-shaped heat insulating material 2a Split piece 2b Split piece

Claims (1)

The outer circumferential surface of the pipe body is made of ceramic fiber made of alumina fiber, and the plurality of circumferentially divided pieces formed with the engagement grooves and the engagement projections are engaged with the engagement grooves and the engagement projections. A pipe member for a heating furnace, characterized by being coated with a ring-shaped heat insulating material integrated and combined.

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