JPS6242229Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to a moisture-resistant heat insulating structure used in a highly humid atmosphere or in a place where water droplets sometimes adhere. [Prior Art] As is well known, many heat insulating structures with different structures and materials are used in various furnaces, flues, ducts, etc. For example, Japanese Patent Application Laid-Open No. 52-60309 proposes a technique in which a molded heat insulating material is attached to the outside of the casing to enhance the heat retaining effect. In this publication, a heat insulating material formed into small blocks is placed outside the casing as a molded heat insulating material, the small blocks are held by a wire mesh to form the first heat insulating layer, and large blocks of heat insulating material are laminated on the outside of the first heat insulating layer. A technique for configuring an arbitrary number of heat insulating layers is disclosed. [Problems that the invention aims to solve] Although all of the conventional insulation materials mentioned above can withstand high temperatures, they can cause damage such as cracking, peeling, and decomposition in high humidity environments or in environments where water droplets may adhere. The problem was that there were too many things. In other words, in the above-mentioned Japanese Patent Application Laid-Open No. 52-60309, the molded heat insulating material is attached to the outside of the casing, so there is no chance of water droplets adhering to it, and for this reason, the outermost surface layer is coated with hard cement. However, no consideration was given to moisture resistance. In any case, the reality is that in the prior art, an effective heat insulating structure that is resistant to both temperature and humidity has not been found. The purpose of this invention is to provide an insulating structure that can withstand high temperatures and has high durability even in a humid atmosphere caused by cooling water, descaling water, etc., and was developed as a result of various efforts on an actual rolling line. It is something. [Means for Solving the Problems] The present invention for solving the above-mentioned problems includes: a molded heat insulating material adhered to a rigid frame by adhesive or via an engaging metal; and a molded heat insulating material covering the surface of the molded heat insulating material. colloidal silica, alumina sol, A moisture-resistant heat insulating material layer constructed on the presser net, consisting of a binder made by mixing one or more kinds of sodium silicate, or a plastering material or spraying material made by adding and mixing a solvent or a diluent in addition to the binder. It is characterized by being composed of. [Operation] The specific configuration and operation of the present invention will be explained based on the drawings showing the embodiments. The drawing is a schematic vertical cross-sectional view of the moisture-resistant heat insulating structure according to the present invention, and 1 is a rigid frame made of a metal plate (ferrous or non-ferrous metal plate such as a steel plate or aluminum plate), compressed asbestos plate, ceramics, etc. It is itself a component of the shell of a furnace or duct.
2 is a molded insulation board, for example, a molded insulation board made of glass wool, rock wool, ceramic wool, asbestos, refractory brick, etc. It is formed into a plate shape, futon shape, or net shape, and can be molded with a mold or compression molded, etc. The composition, hardness, and degree of insulation can be adjusted according to the requirements. 3 is a holding net, which is made of wire mesh (iron, aluminum, stainless steel, brass, etc.), fireproof fiber, heat-resistant fiber, such as asbestos or glass, and is 0.2 to 10 mm in diameter.
A net woven from the unit wire is laid on the surface of the molded heat insulating board 2, and serves to hold down the molded heat insulating board 2 and to serve as a supporting material for the moisture-resistant heat insulating material described later.The wire is wound and entangled. The means for matching can also be the presser net of the present invention. Although the drawing shows a case in which the holding net 3 and the molded heat insulating material 2 are fixed together using the studs 4 welded and planted on the rigid frame 1, the present invention is not limited to this. Adhesion using an inorganic or epoxy polymer adhesive such as sodium silicate, or a method of partially melting and adhering with heat can also be employed. A means for locking the holding net 3 to the molded heat insulating material 2 with a pin (not shown) is also used. Next, a moisture-resistant heat insulating material is coated or sprayed onto the holding net 3 to form a surface moisture-resistant heat insulating material layer 5. As a moisture-resistant heat insulating material, one or more of asbestos, glass, ceramic, etc. in the form of fibers, short pieces, or granules is appropriately selected and crushed, and the mixed mixture is used as a fireproof aggregate. One or a mixture of two or more of colloidal silica, alumina sol, and sodium silicate is added to the refractory aggregate as a binder, and if necessary, a solvent or diluent is added and mixed in addition to the binder. A structured plastering material or spraying material is used. This moisture-resistant heat insulating material is applied to the presser net 3 using a well-known appropriate coating or spraying means (for example, a spray nozzle, brushing, or spray gun).
and forms a surface moisture-resistant heat insulating material layer 5. [Example] After sufficiently drying the structure based on the present invention described above and heating it to a temperature range of 800 to 1000°C,
The water injection and cooling operation was repeated 10 to 30 times, but there were only minor cracks and peeling, proving the product's durability. For comparison, when a structure consisting of only the molded heat insulating board 2 without the surface moisture-resistant heat insulating material layer 5 and the presser net 3 was similarly heated and cooled by water injection, peeling and falling off was observed after 2 to 3 times. A similar test was also conducted on a structure consisting of a holding net 3 and a molded heat insulating board 2.
Peeling was observed after ~10 times. Next, a structure based on the present invention having a surface moisture-resistant heat insulating material layer 5 having the composition shown in Table 1 was applied to a heat insulating cover covering a conveyance table of an actual continuous casting facility. In this transport table, the transport rollers are water-cooled, and the environment is extremely bad, with water droplets scattering all the way to the heat insulating cover. However, with the moisture-resistant heat insulating structure of this invention, its lifespan is over one week, especially when ceramic wool or asbestos is used. The products that were used were able to be used stably for a long period of time, ranging from one month to more than six months. On the other hand, the surface insulation layer made of ceramic wool mixed with primary aluminum phosphate has a lifespan of only 1 to 2 days.
It was not possible to put it into practical use.

[Table] [Effects of the invention] The moisture-resistant insulation structure of the invention has a surface moisture-resistant insulation layer 5.
By firmly bonding with the presser net 3, a synergistic effect is exerted to prevent the occurrence of cracks, crack propagation, and peeling. As a result, the moisture-resistant heat insulating structure of the present invention can extend the lifespan by 1.5 to 10 times compared to conventional structures. Therefore, the moisture-resistant insulation structure of this invention can be used in furnaces, ducts,
In addition to flue thermostats, it can now be widely applied to rotating bodies such as high-temperature conveyance rollers and rotary heat retention furnaces.

[Brief explanation of the drawing]

The drawing is a schematic vertical cross-sectional view of a moisture-resistant heat insulating structure according to the present invention. DESCRIPTION OF SYMBOLS 1... Rigid frame body, 2... Molded heat insulating material, 3... Pressing net, 4... Stud, 5... Surface moisture-resistant heat insulating material layer.

Claims (1)

[Scope of utility model registration request] A molded heat insulating material adhered to the rigid frame by adhesion or via a mating metal fitting; A holding net made of metal or heat insulating material that covers the surface of the molded heat insulating material; Asbestos in the form of fibrous, short pieces, or granules; One or two of colloidal silica, alumina sol, and sodium silicate are added to the refractory aggregate made by crushing and mixing one or more of glass, ceramic, etc.
a moisture-resistant heat-insulating layer constructed on the presser net, which is made of a binder mixed with at least one species, or a plastering material or a spraying material made by adding and mixing a solvent or diluent to the binder; and a moisture-resistant heat-insulating structure. body.