JPS5942227B2 - Method of forming fireproof insulation structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of forming a refractory insulation structure such as a furnace wall using a ceramic fiber blanket.

To line the inside of a furnace with a ceramic fiber blanket, apply a bank-up insulation material to the furnace casing made of steel plates, apply the ceramic fiber blanket over it, and secure it with pins, bolts, etc. fixed to the furnace casing. It is fixed by pressing from the surface.

If a part of the fixing metal fittings such as pins and bolts for fixing the ceramic fiber blanket are exposed on the inner surface of the furnace, it is necessary to use a high heat resistant alloy material for this part.

However, it is difficult to obtain materials that can be used for long periods at high temperatures of 1200°C or higher (and even if available, they are expensive and impractical.

A large number of bank-up materials are applied to the inner surface of the furnace with gaps between them, and a ceramic fiber blanket is applied to the surface of each of the backup materials, and the ends of these are bent into the gaps between the backup materials. There is also a method of compressing and filling ceramic fibers of the same quality in between and attaching a ceramic fiber blanket to the inner surface of the furnace.

However, according to this method, the mounting fittings are not exposed in the furnace, so inexpensive ones can be used, but since the ceramic fiber blanket is bent, there is a limit to the thickness of the ceramic fiber layer.

The present invention aims to provide a method for forming a refractory insulating structure for furnace walls and other refractory insulating structures that solves the above-mentioned problems.

To achieve this objective, the present invention forms a fireproof and insulating structure by the method described in the claims.

FIG. 1 shows an example of a ceramic fiber blanket 1 formed into a plate shape used in the present invention.

For example, the figure is 25mm thick and 125mm wide. Although it is formed into a rectangular shape with a length of 600 mm, it is also possible to use a shape suitable for the place where it is used, such as a square plate shape or a fan shape.

FIGS. 2 and 3 show an embodiment in which a furnace wall is formed using the ceramic fiber blanket 1 having the shape shown in FIG.

A large number of supports 3 are integrally provided in a furnace casing 2, which is a structure that supports a heat insulating material, so as to protrude into the furnace.

The support 3 is made of a square steel plate having one side slightly larger than half the width of the ceramic fiber blanket, and is welded to each intersection of lines drawn in a grid pattern on the surface of the furnace casing 20 in the same direction.

Each support 3 is provided with two holes arranged laterally and furthest away from the furnace casing 2.

On such a furnace casing 2, a rectangular ceramic fiber blanket 1 is compressed between supports 3°3 and stacked parallel to the furnace casing 2 so that one side in the longitudinal direction is located on the furnace casing 2 side. A rod 4 made of 5 US 304 with one end pointed is passed through the hole previously formed in the ceramic fiber blanket 1 from the support 3 of the support 3 to the other support 3, and both ends of the rod 4 are held in the support 3. Attach the ceramic fiber blanket 1 to the furnace casing 2.

Next, a stack of ceramic fiber blankets 1 is placed between the support 3 of this section and the support 3 of the next section in a similar manner so as to be continuous with the previously applied section, and the stack of ceramic fiber blankets 1 arranged is In the same way as before, stick rods 4 through the stack of ceramic fiber blankets 1 to two supports 3 located at the front and back (or above and below) of the ceramic fiber blanket 1 (one is shared with the previous one as shown in the figure). In this way, a large number of ceramic fiber blankets 1 are compressed and laminated one after another, and a rod 4 penetrated through the layers in the stacking direction is inserted between the ceramic fiber blankets 10 from the furnace casing 2, which is a heat insulating support structure. It is supported by a support 3 that projects from the furnace casing 2.

Although the figure shows a case in which the ceramic fiber blanket 1 is provided in contact with the furnace casing 2, a suitable back-up material such as a heat insulating board may be interposed between the ceramic fiber blanket 1 and the furnace casing 2.

It is also possible to form the furnace wall by dividing the structure formed as described above and attaching it to a reinforcing frame provided on the outside of the furnace.

Arms may be protruded from the sides of the H-shaped steel at intervals to form supports, and the arms may be inserted between ceramic fiber blankets, and the outside of the furnace may be covered with refractory bricks instead of the furnace casing.

In the embodiment shown in FIG. 4, supports made of L-shaped members 5 are welded and parallel to each other at intervals inside the furnace casing 2, and one side 5' of the L-shaped members protrudes parallel to the inside of the furnace by bolts or the like. The case where the support is formed is shown.

In this case, after laminating the ceramic fiber blanket 1 on one side 5'VU, insert the rod 4 into the lamination of the ceramic fiber blanket 1 through one side 5', and insert the rod 4 into the lamination of the ceramic fiber blanket 1 on the side 5' where the ceramic fiber blanket 1 is not yet laminated. With the stick 4 protruding from the side, stick the stick 4 on one side 5.
′.

Then, the ceramic fiber blanket 1 is stacked on the rod 4 on the protruding side while being pushed against the rod 4 on the protruding side.

When the lamination reaches the next side 5', the rod 4 is attached to the side 5' in the same manner as before.

In this case, the positions of the rods 4 attached to adjacent sides are alternated, and the ends of the rods 4 that protrude from each other overlap when viewed from the side.

In this way, the ceramic fiber blanket is supported on the support.

The compression ratio when laminating ceramic fiber blankets varies depending on the heat resistance of the ceramic fiber blankets, but the maximum operating temperature is approximately 1200°C, and when the bulk specific gravity is 0.096 g/cc, it is 10 to 30%/
/ 0.128g/CC〃 8~20%1/
0.160 g/CC〃 A range of 5 to 15% is appropriate, and the higher the temperature at the place of use, the better the compression ratio.

As described above, according to the method of the present invention, plate-shaped ceramic fiber blankets can be easily compressed and laminated, and since the ceramic fiber blankets on the furnace wall are compressed, they can be installed for a long period of time without creating gaps due to heat shrinkage. Does not require repair.

Simply attach a support with a hole through which the rod is inserted to an insulating support structure such as a furnace casing, compress a plate-shaped ceramic fiber blanket between the supports, and attach it to the support using the rod. Since only a few parts are required, installation is extremely easy, and even when used in high places or on ceilings, it can be installed securely without sagging.

In addition, since the mounting brackets are not exposed to the inside of the furnace, durability is improved, and the fibers in the ceramic fiber blanket are located perpendicular to the inside of the furnace and are less likely to be blown away by the airflow, so the flow rate of the airflow inside the furnace can be increased to the maximum speed compared to conventional methods. 10-12
rrt/see to 15 m/see or more.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an example of a plate-shaped ceramic fiber blanket used in the present invention, FIGS. 2 and 3 are a side view and a plan view of an example of the method of the present invention, and FIG. 4 is a diagram showing another example of the method of the present invention. FIG. 3 is a perspective view of an example. 1... Ceramic fiber blanket, 2
-... Furnace casing, 3... Support, 4
...Bar, 5...L-shaped material, 5'...
...One side of L-shaped material 5.

Claims (1)

[Claims] 1. A large number of supports are integrally provided on one side of the heat insulating material support structure so as to protrude, and a ceramic fiber blanket formed in the shape of a plate wider than the protruding length of the supports is supported from the heat insulating material supporting structure between the supports. A method for forming a fireproof heat insulating structure, which comprises compressing and laminating a large number of ceramic fiber blankets so as to protrude from the body, and inserting a rod directly through the laminated ceramic fiber blanket and a support in contact with the laminated ceramic fiber blanket.