JPH0235235B2 - ROHEKINODANNET SUSEKOHO - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is a method for installing an inorganic fiber heat insulating material on the inner wall surface of a heating furnace for various metal materials, an aluminum melting furnace, a ceramic firing furnace, a naphtha cracking furnace, etc. It is related to.

PRIOR TECHNOLOGY There are many methods for installing inorganic fiber heat insulating materials on the inner surface of furnace walls, but most of them involve cutting blankets or boards made of heat-resistant fibers such as ceramic fibers into appropriate dimensions ( or a laminate thereof) is fixed to the furnace wall using various metal fittings. However, this method requires cutting the blankets and boards to predetermined dimensions and assembling the cut pieces at the construction site, making the construction procedure complicated and tending to create a poor working environment due to scattering of fibers. It is. Furthermore, when the fixing fittings are exposed on the surface of the heat insulating wall, deterioration of the fittings due to heat and heat loss via the fittings become a problem. In order to avoid such problems, there is a method of fixing a blanket, etc. that has been finished to a predetermined size on the furnace wall using mounting brackets that are not exposed on the surface (Special Publication No. 59-9512, Japanese Patent Publication No. 59-9512).
42227 etc.). However, these methods cannot solve the problem of fiber scattering during construction and when the furnace is used after construction, and there is also the problem that construction on curved surfaces is difficult due to the shape of the insulation material used and the nature of the mounting hardware. It was left behind.

Problems to be Solved by the Invention In view of the fact that the conventional insulation construction method had the above-mentioned problems, the present invention aims to improve workability while maintaining a good working environment without scattering fibers. The purpose of the present invention is to provide a method for constructing a heat-insulating furnace wall that can be easily applied to any part and has good durability.

Means for Solving the Problems Firstly, the outline of the insulation construction method of the present invention will be described. An inorganic fibrous block formed from a fireproof material whose main component is fiber, and an L that has a locking part and an anchoring effect on separate sides, each having a bolt insertion hole with a diameter larger than the outer diameter of the nut of the bolt with nut shown below. The mounting bracket has a base part in the inorganic fiber block, and the mounting part is grooved so that the hook part is in the same plane as the surface of the inorganic fiber block where the groove-shaped notch is provided. An inorganic fibrous heat insulating material with mounting hardware, which is exposed in the shaped notch and integrated with the inorganic fibrous block, is used as the heat insulating material. On the other hand, a bolt with a nut is fixed perpendicularly to the furnace wall to provide a means for attaching a heat insulating material on the furnace wall side. Then, the above-mentioned heat insulating material is attached to the furnace wall by inserting the bolt with the nut into the bolt insertion hole in the latching part of the mounting bracket up to the nut part, and then inserting a washer between the nut and the latching part of the mounting bracket. Temporarily fasten,
Next, the nuts are tightened to secure the insulation material to the furnace wall.

EXAMPLES Hereinafter, the present invention will be described with reference to drawings showing specific examples.

FIG. 1 shows an example of an inorganic fiber heat insulating material with mounting fittings used in the method of the present invention. The inorganic fiber block 1 is mainly made of ceramic fibers such as alumina fibers and aluminosilicate fibers and rock wool, and is filled with an inorganic refractory powder (for example, alumina powder, silica sand, silica powder, refractory viscosity, etc.).
It is formed by adding an appropriate amount of. Although the inorganic refractory powder is not essential, it helps reduce thermal shrinkage and improve shape stability after the furnace is put into use. However, if too much is added, the density is too high and the insulation is not good.
It is desirable that the weight does not exceed twice the fiber weight at most. For molding, water-based inorganic binders such as colloidal silica and alumina sol are used.

The inorganic fibers 2 constituting the inorganic fiber block 1 are preferably placed on the surface 4 facing the furnace wall so that the supporting force of the mounting bracket 3 is increased and the fibers are less likely to scatter during use of the furnace. It is oriented along orthogonal planes (as is well known, such orientation is determined by the pressing direction during molding).

Because the inorganic fiber block 1 has the above-mentioned configuration, the deformation rate in the compression direction when compressed with a load of 3 kg/cm ² in the direction perpendicular to the fiber orientation plane (vertical direction in Figure 1) is normal. It has a significantly higher modulus of elasticity of less than 20%, typically about 0.5 to 15%, compared to conventional inorganic fiber insulation materials which exhibit deformation of around 70% under the same conditions.

The inorganic fiber block 1 is generally a cube or a rectangular parallelepiped with a side length of about 15 to 30 cm, but has a groove-like cutout 5 on the surface 4 facing the furnace wall to enable the installation operation. have

As shown in Fig. 2, the mounting bracket 3 has a bolt insertion hole 6 formed in one half of a rectangular iron plate bent into an L shape to form a latching part 7, and the other half has two latches therein. A dowel rod 8 is welded to form a base 9 that is embedded in the inorganic fiber block 1.

The inorganic fiber block 1 and the mounting bracket 3 are integrated during the manufacturing process of the former, and due to the anchoring effect of the base 9 having the engagement rod 8, even if the mounting bracket 3 supports the entire weight of the inorganic fiber block 1, The mounting bracket 3 will not come off from the inorganic fiber block 1. Mounting bracket 3
As shown in FIG.
And the upper surface 12 of the hooking part 7 is made of inorganic fiber block 1.
It is integrated with the inorganic fiber block 1 so that it is in the same plane as the groove-shaped notch 5 installation surface (that is, the surface 4 facing the furnace wall).

FIG. 3 shows a bolt with a nut for attaching the above-mentioned inorganic fiber heat insulating material with mounting bracket to the furnace wall. The bolt 15 with a nut is welded to the iron skin of the furnace wall with the part without the thread groove 16 facing the furnace wall and perpendicularly to the furnace wall.

When attaching the heat insulating material to the furnace wall, with the surface 4 facing the furnace wall, pass the bolt 15 with a nut together with the nut 17 through the bolt insertion hole 6 of the mounting bracket 3 (bolt insertion hole 6
(The size of the nut 17 is selected to allow the nut 17 to pass through.) After that, between the nut 17 and the hook 7, a split-end washer 18 as shown in FIG.
Insert. The bolt insertion gap 19 of the washer 18 is
Since the nut 17 can be latched, the washer 18
After insertion, the heat insulating material does not separate from the bolt with nut 15 even if the hand is removed, and is temporarily fixed to the furnace wall. Next, by inserting a wrench into the groove-shaped notch 5 and tightening the nut 17, the heat insulating material is completely fixed to the furnace wall. In this way, the insulating materials are lined up and fixed one by one on the furnace wall like bricks, but at that time, the inorganic fiber blocks 1 are not brought into close contact with each other, and there are approximately 3 Leave a gap of ~20mm, and finally,
It is better to fill it with a suitable (preferably fibrous) putty-like filler.

FIG. 5 is a partially cutaway view showing a part of the heat insulating furnace wall constructed as described above, in which 20 is the furnace wall shell and 21 is the filler. The surface seen from inside the furnace is covered with inorganic fiber blocks 1 like the brick-clad surface.
Only the filler 21 appears.

The inorganic fiber blocks, mounting hardware, washers, bolts with nuts, etc. used in the construction method of the present invention are not limited to those in the above embodiments, and may make the construction procedure as described above difficult. It goes without saying that various other materials may be used as long as they do not significantly impair the effects of the invention. For example, in the above embodiment, a putty-like filler is filled between the inorganic fibrous blocks, but an inorganic fiber blanket is adhered to the side surface of the inorganic fibrous block in advance, and the inorganic fibers are placed at intervals such that the blanket is compressed. The gaps between the blocks may be eliminated by arranging and fixing the blocks. In addition, in order to prevent gaps from forming between the furnace wall steel shell and the inorganic fiber block, a thin inorganic fiber blanket may be adhered to the surface of the steel shell in advance (the blanket is attached to the inorganic fiber block mounting bracket). It becomes compressed due to the tightening pressure, and its resilience prevents gaps from forming.)

6 and 7 both show other examples of washers that can be used in the method of the invention. In the one in Figure 6, only the large diameter part of the gourd-shaped bolt insertion hole 22 has a diameter that allows the nut of the bolt with a nut to pass through, so after inserting the washer in this part, Use the part to hold nuts.

The number of mounting brackets is not limited to one per inorganic fiber block, but may be two if necessary.
It can be made into pieces.

Effects of the Invention The insulation construction method of the present invention uses inorganic fibers that are formed into blocks in advance and integrated with the mounting fittings as the insulation material, so there is no need to cut the insulation material at the construction site. The only metal fittings required for installation on site are bolts with nuts to be fixed to the furnace wall. Therefore, according to the present invention, construction can be carried out efficiently while maintaining a good working environment without scattering of fibers from the heat insulating material.

Further, according to the method of the present invention, the metal fittings and the inorganic fiber block can be reliably connected, unlike the case where the fittings are attached to the heat insulating material at the construction site. Furthermore, the mounting hardware used is buried within the inorganic fiber block after construction is completed, and is not exposed at all to the inner surface of the furnace. Therefore, the uniformity of the formed heat insulating wall is excellent, and there is little deterioration of the metal fittings due to heat and only a small amount of heat loss through the metal fittings. Since the metal fittings are not exposed to high heat, there is no need to use expensive heat-resistant metals for the metal fittings. In particular, when using an inorganic fiber block made by blending an inorganic refractory powder and an inorganic binder as used in the above example, it has high mechanical strength, wind speed resistance, and A highly durable insulating wall with excellent vibration resistance is formed.

The construction method of the present invention, in which the insulation material used is in the form of a block, is similar to the construction method for laying firebricks, and therefore, it is not only easy to construct on curved surfaces, but also easy to construct. Another advantage is that it is easy to repair if the furnace wall is partially damaged.

[Brief explanation of drawings]

FIG. 1: A perspective view showing an example of an inorganic fiber heat insulating material with mounting fittings used in the method of the present invention. Figure 2: 1st
FIG. 3 is a perspective view of a mounting bracket 3 in the heat insulating material shown in the figure. Third
Figure: A perspective view of a bolt with a nut for attaching the heat insulator shown in Figure 1 to the furnace wall. Figure 4: A perspective view of a washer for attaching the heat insulating material of Figure 1 to the furnace wall. FIG. 5: A partially cutaway view showing a portion of an insulating furnace wall constructed using the insulation material of FIG. 1. FIG. 6, FIG. 7: A plan view showing another example of a washer that can be used in the method of the present invention. 1: Inorganic fiber block, 3: Mounting bracket, 5:
Groove-shaped notch, 6: Bolt insertion hole, 7: Latching part,
8: Engagement rod, 9: Base, 15: Bolt with nut,
17: Nut, 18: Washer, 20: Furnace wall iron skin, 2
1: Filling material.

Claims (1)

[Scope of Claims] 1. An inorganic fibrous block formed of a fireproof material mainly composed of inorganic fibers into a rectangular parallelepiped shape having a groove-like notch extending from the center of one surface toward one side, and the following bolt with a nut. It consists of an L-shaped mounting bracket that has a hook part with a bolt insertion hole with a diameter larger than the outer diameter of the nut and a base part that has an anchoring effect on separate sides, and the mounting bracket has an inorganic fiber block at its base part. An inorganic fiber with a mounting bracket that is placed inside the inorganic fiber block and is integrated with the inorganic fiber block by exposing the hook part in the groove-like cutout so that it is on the same plane as the surface of the inorganic fiber block with the groove-like cutout. A quality insulation material is used as the insulation material, a bolt with a nut is fixed perpendicularly to the furnace wall, and the insulation material is attached to the furnace wall side. After inserting the above-mentioned bolt with nut to the nut part, insert a washer between the nut and the attachment part to temporarily fasten it to the furnace wall, and then tighten the nut to fix the insulation material to the furnace wall. A furnace wall insulation construction method featuring: