JPH0217869Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a composite refractory insulation material block used for lining various industrial furnaces, and more particularly to a composite refractory insulation material block mainly used at high temperatures of 1200° C. or higher.

In recent years, from the viewpoint of saving resources and energy, refractory inorganic fiber linings have been increasingly used for the walls of various industrial furnaces.

These inorganic fibers are used in the form of blankets, felt modules or blocks;
Lining methods include adhering to the wall using fire-resistant inorganic adhesives, fire-resistant organic-inorganic composite adhesives, fire-resistant mortar, etc., or bonding to the wall using metal anchors, ceramic anchors, etc.; It varies depending on the purpose and usage temperature. In particular, various proposals have been disclosed regarding ceramic fibers and polycrystalline inorganic fibers used at high temperatures of 1200°C or higher, proposals regarding inorganic fiber blocks, and proposals regarding lining methods.

The lining structure made of the above-mentioned fire-resistant inorganic fibers can be broadly classified into different materials for temperatures below 500°C, below 1200°C, and above 1200°C, each with the following characteristics.

In other words, in the low temperature range below 500℃, glass fiber,
Inorganic fibers with low fire resistance such as rock wool are often used, and glass fibers have poor heat resistance and are rarely used as linings for kilns.

In the medium temperature range below 1200℃, ceramic fiber blankets or felt lining structures are often used on the inner surface of the furnace wall, but in the high temperature range above 1200℃,
A method of simply lining the ceramic fiber blanket or felt parallel to the heating surface, the so-called paper lining method, is used, but when ceramic fiber is used, shrinkage due to recrystallization due to heating, Another drawback is that the ceramic fiber itself tends to peel off during use due to deterioration.

As a way to improve the above drawbacks,
As shown in Japanese Patent No. 32996, there is one in which the length direction of the inorganic fibers is perpendicular to the heating surface. In this method, by making the length direction of the inorganic fiber perpendicular to the heating surface, one end of the inorganic fiber is heated and shrinks due to recrystallization, but this only partially shrinks and the overall is that contraction is suppressed. Therefore, compared to the above-mentioned paper lining method in which the length direction of the fibers is parallel to the heating surface, the entire fiber is heated and shrinkage occurs as a whole due to recrystallization, the method disclosed in the above-mentioned publication is superior. It is said that

However, in any case, shrinkage or deterioration due to recrystallization of the ceramic fiber on the heating surface side during use is an essential phenomenon of ceramic fibers, and shrinkage must be avoided even if there are differences overall or partially. It was something I couldn't do.
Furthermore, the construction method disclosed in the above-mentioned publication, in which the direction of the block is changed by 90 degrees at the time of construction to alleviate the effect of volumetric shrinkage, is not sufficient to achieve sufficient effects under the severe conditions described below. has not yet been reached.

This is because if there is alkali vapor in the atmosphere of the furnace used, if there is a lot of splashing, or if there is a large amount of dust, this will promote shrinkage and deterioration of the ceramic fiber due to recrystallization.
These substances have the disadvantage of causing abrasion and producing low melting point compounds by reaction with ceramic fibers, resulting in a significant decrease in performance.

To eliminate the above-mentioned drawbacks, there is a method of troweling or spraying a fire-resistant coating material on the heated side of the ceramic fiber lining, or welding a fire-resistant board with a fire-resistant inorganic adhesive or a fire-resistant organic-inorganic adhesive. Alternatively, there is a method of coating and protecting the surface of the ceramic fiber by bonding it with a metal anchor, a ceramic anchor, or the like.

However, in the former coating protection method using a coating material, a coating layer several millimeters thick is formed on the surface of the ceramic fiber, which has the disadvantage that damage progresses due to cracking and peeling from the interface with the ceramic fiber. be.

In addition, the latter method of bonding fireproof boards with adhesives has the same problem as using coating materials, in that they tend to peel off from the adhesive surface with ceramic fibers, and bonding methods using metal anchors or ceramic anchors also have the problem. However, metal anchors are inferior in heat resistance, and ceramic anchors are inferior in mechanical strength and spalling resistance, so they are not sufficiently effective. do not have. The formation of the ceramic fiber coating protective layer as described above is carried out at the time of ceramic fiber construction, but there are two methods: using a fire-resistant coating material, bonding a fire-resistant board with an adhesive, and attaching a fire-resistant board to a metal anchor or ceramic. In either method of joining with anchors, the construction work is double or triple and extremely complicated.

On the other hand, as a countermeasure against shrinkage deterioration due to recrystallization during use, which is an essential drawback of ceramic fibers, there is a method of using crystalline fibers such as alumina fibers, zirconia fibers, and mullite fibers, but none of these Although it is effective in preventing heat shrinkage, it cannot prevent damage caused by abrasion caused by alkaline components, splash, dust, etc. in the atmosphere of use, and the formation of low-melting compounds due to reactions. Moreover, these crystalline fibers are extremely expensive and economically disadvantageous.

In view of this, the present invention has developed a composite fireproof insulation material block that can eliminate the various problems of the above-mentioned prior art. A block body formed into a prismatic shape, and alumina, silica, siyamoto, magnesia, silicon carbide, etc. interposed between layers of inorganic fiber material arranged in a spiral shape so as to divide the block body into multiple layers in the circumferential direction. The invention is characterized in that it is a composite fireproof insulation material block consisting of a flexible water-resistant board whose main component is heat-resistant powder.

The fireproof board used here is Japanese Patent Application No. 53-77519 (Japanese Unexamined Patent Publication No. 55-77), which was previously filed by the inventors of the present invention.
-Refer to Publication No. 7514) "Flexible fireproof board"
Since it is necessary to wind it into a roll at the manufacturing stage, it is desirable that the thickness is 5 m/m or less, or 5 m/m or less. The inorganic fiber material that can be used may be in the form of bulk, blanket, or felt, but it is preferable to use a blanket-like material. The composite fireproof insulation material block of the present invention is made by bonding the inorganic fiber material to the required thickness on the fireproof board using an adhesive, and after applying the adhesive to the top surface of the inorganic fiber material in the same way, it is rolled. Unroll,
It can be obtained by cutting into any length, pressure molding into any cross-sectional shape, and drying. The above drying temperature is preferably 300℃ or less, and the drying time can be arbitrarily selected until the adhesive is dry.
Further, during pressure molding, hot pressing may be performed at a temperature below the above-mentioned temperature.

In addition, the operating temperature of the composite fireproof insulation material block is
If the temperature is below 500°C, glass fiber or rock wool is used as the inorganic fiber material, and shamrock or silica is used as the fireproof board.
If the operating temperature is 500°C or higher, ceramic fiber or polycrystalline fiber is used as the inorganic fiber material, and alumina, magnesia, silicon carbide, etc. are selectively used as the fireproof board. The composite fireproof insulation material block according to the present invention is as follows:
Adjusting the thickness of the inorganic fiber material used, the tightening force when winding it into a roll, and the number of rolls;
By adjusting the pressure during pressurization, blocks with arbitrary bulk specific gravity can be obtained.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of a composite refractory insulation material block (hereinafter simply referred to as a composite block) according to the present invention will be described with reference to the drawings.

1 to 4 illustrate a composite block 1 according to the present invention, which includes a block main body 2 formed in a prismatic shape from an inorganic fiber material, and a structure in which the inside of the block main body 2 is divided into a plurality of layers in the circumferential direction. It consists of a flexible fireproof board 4 which is arranged in a spiral shape and is interposed between inorganic fiber layers 3, 3, . . .

The inorganic fiber material is selected from glass fiber, rock wool, ceramic fiber, polycrystalline inorganic fiber, etc., and the flexible fireproof board 4 includes:
The main component used is a heat-resistant powder such as alumina, silica, siyamoto, magnesia, or silicon carbide.

In order to form the above-mentioned composite block 1, as shown in FIG. It can be obtained by cutting into squares and then pressing into a flat prismatic shape. In this case, in the case of the embodiment shown in FIGS. 1 and 2,
As shown in Figure 6, the flexible fireproof board 4 is wound on the outer side, and in the case of the embodiments shown in Figures 3 and 4, the flexible fireproof board 4 is wound on the inner side as shown in Figure 7. It was obtained by winding it as a.

Composite block 1 shown in FIGS. 1 and 3 above
is mainly used as a wall lining, but in particular, the composite block 1 shown in FIG. It is effective in preventing physical abrasion, and can also prevent the penetration of high-temperature gases as well as shrinkage due to fiber orientation.

Furthermore, even if the internal inorganic fibers 3' deteriorate and powdering occurs, the flexible fireproof board 4 interposed between the inorganic fiber layers 3, 3, etc. will prevent it from collapsing and contaminate the contents in the furnace. I have nothing to do.

Although the composite block 1 shown in FIG. 3 has good heat insulation properties, it is desirable to use it in a furnace with little alkali steam, dust, splash, etc. However, since the fireproof board 4 is provided inside in a spiral manner, it is effective in preventing penetration of high-temperature gas, and even if damage occurs on the surface, it is effective in preventing damage to the inside.

The composite block 1 shown in FIGS. 2 and 4 is
It is mainly suitable for use as a back-up lining between refractory bricks or between refractory bricks and steel skin. In this case, due to the heat insulating properties of the inorganic fibers 3' and the gap maintaining function of the fireproof board 4, excessive compression will not occur, and a good heat insulating structure can be obtained.

Of course, for the construction of the above-mentioned composite block 1, it is possible to use either the so-called veneering method in which the blocks are pasted together using an adhesive or refractory mortar, or the method in which they are joined using metal anchors, ceramic anchors, etc.

Next, the results of using the composite block according to the present invention will be described.

Example A composite block was made into a shape of 300 x 300 x 50 m/m, the inorganic fiber material 3' was a ceramic fiber blanket with an alumina content of 95%, and the fireproof board 4 was a ceramic fiber blanket with an alumina content of 95% and a thickness of 2 m/m. Composite block 1 with the configuration shown in the first diagram
As a result of using it on the wall of a ceramic firing furnace, a composite block made of the same material as the above composite block with an alumina content of 95% turned into powder after 3 months of use, contaminated the surface of the ceramics in the furnace, and had to be replaced. In contrast to this situation, which had to be repaired, the composite block created by this invention shows no pulverization or contamination of the ceramics in the furnace even after 6 months of use, and can be used for a long time of more than 2 years. It was confirmed that

Example A composite block was made into a shape of 150 x 300 x 30 m/m, the inorganic fiber material 3' was a ceramic fiber blanket with an alumina content of 55%, and the fireproof board 4 was a ceramic fiber blanket with an alumina content of 50% and a thickness of 3 m/m. As a result of constructing the composite block 1 shown in the second figure on the front surface between the lining refractory brick and the steel shell of the molten steel ladle using a molten steel ladle, the insulation effect and durability will be achieved during the molten steel residence time of 3 hours. The molten steel temperature decreases by 3 to 6 degrees Celsius, and the temperature of molten steel when the composite block of the present invention is not used is 35 degrees Celsius, and the difference is 29 to 32 degrees Celsius.
It has been found that this drastic temperature drop can be prevented. Moreover, the thickness of the composite block 1 after use is
The temperature was 30 m/m before use, but it was reduced to 27 m/m, and the expansion of the lining refractory bricks was sufficiently absorbed, and at the same time, no change was observed in the ceramic fibers.

As explained above, according to the present invention, a flexible fireproof board is spirally installed inside a block body formed in a prismatic shape made of inorganic fiber material, and the inorganic fiber material is partitioned into multiple layers in the circumferential direction. As a result, the shape retention properties of the composite block are exhibited, and when used for ceilings, it is possible to prevent peeling due to drooping, and when used for flooring, it is possible to prevent deterioration of insulation properties due to compressive deformation. Can be done. In addition, the flexible water-resistant board installed in a spiral shape acts as a protective layer for the inorganic fiber material, preventing the intrusion of foreign components (alkali, acidic substances, scale, etc.) that can adversely affect the useful life of the block. It is possible to prevent chemical and physical damage to inorganic fiber materials. These prevent the shrinkage of the fiber material, eliminating the generation of gaps.Furthermore, even if the inorganic fiber material deteriorates, the flexible fireproof board installed in a spiral shape divides the inorganic fiber material into continuous layers. Since the block is held in place, it will not fall off and the useful life of the block can be greatly improved.

[Brief explanation of the drawing]

1 to 4 are perspective views showing an embodiment of the composite refractory and heat insulating material block of the present invention, and FIGS. 5 to 7 are explanatory views showing the process of obtaining the block. 1... Composite block (composite fireproof insulation material block), 2... Block body, 3... Inorganic fiber material layer,
3'...Inorganic fiber material, 4...Flexible fireproof board.

Claims (1)

[Scope of utility model registration request] The block body is formed into a prismatic shape using inorganic fiber materials such as glass fiber, rock wool, ceramic fiber, and polycrystalline inorganic fiber, and the inorganic fibers are spirally arranged inside the block body to divide the block body into multiple layers in the circumferential direction. A composite fireproof insulation material block consisting of a flexible fireproof board whose main component is heat-resistant powder such as alumina, silica, siyamoto, magnesia, silicon carbide, etc. interposed between the layers of the material.