JPH0217769B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a radiant cup burner tile that heats an object by emitting radiant heat.

(Prior art) For example, as shown in Fig. 1, radiant cup burner tiles (hereinafter simply referred to as burner tiles) 3
is used by being mounted in the furnace wall 2 of the furnace 1 with the radiation surface A facing.

Conventionally, as shown in Figs. 4 and 5, the burner tiles 3 were made of brick-like refractories integrally molded from the same material, such as cordierite or clay molded and fired, making them susceptible to thermal shock. (Thermal spalling resistance is low), and as a result, damage, cracking, etc. are likely to occur due to rapid heating and cooling.

Furthermore, this conventional burner tile 3 had a high thermal conductivity and was accompanied by energy loss.

(Problems to be Solved by the Invention) An object of the present invention is to solve the above problems and provide a burner tile that is resistant to thermal shock and has excellent heat insulation properties.

(Means for Solving the Problems) The description of the claims applies mutatis mutandis (Example) The burner tile of the present invention will be described below according to an example shown in the drawings.

FIG. 2 shows a burner tile according to the invention, the burner tile 3 having a main body 4 made of a ceramic fiber paste.

The main body 4 does not disturb the burner tile 3 even at high temperatures.
This is to maintain the shape as shown in FIG.

It is important that the main body 4 be lightweight, easy to mass produce, and easy to process, and for this reason it is made by molding a paste of ceramic fiber.

Furthermore, it is important that the main body 4 be resistant to thermal shock, and ceramic fibers are extremely suitable in this respect as well.

Next, a fibrous layer 5 is fixed to the surface of the main body 4 on the radiation surface A side.

The fibrous layer 5 is made by bonding inorganic fibers such as ceramic fibers, alumina fibers, mullite fibers, and zirconia fibers using a binder.

As the binder, an inorganic binder such as colloidal silica, colloidal alumina, aluminum phosphate, etc., preferably colloidal silica, is used.

Furthermore, organic binders such as starch, latex, phenol resin, etc. may also be used in place of or in addition to inorganic binders.

Large amounts of inorganic binders tend to reduce flexibility at high temperatures.

A vacuum suction molding method is suitable as a method for molding the fibrous layer 5.

That is, the inorganic fibers and binder are mixed with water, a mold made of wire mesh or the like is submerged in the solution, and the fibers are deposited on the surface of the mold by vacuum suction.

The fibrous layer 5 described above is made of inorganic fibers intertwined with each other, so it can absorb expansion and contraction and has great resistance to rapid heating and cooling.

Furthermore, heat insulation properties are ensured, and this heat insulation property blocks the high temperature inside the furnace 1 and extremely reduces energy loss.

Therefore, the coating layer 6 described below can be maintained at a high temperature.

Next, a coating layer 6 is attached to the surface of the fibrous layer 5.

The coating layer 6 is formed by adhering refractory material particles of alumina, mullite, chromium, zirconia, etc., preferably mullite, to the surface of the fibrous layer 5 by spraying, coating, etc. using an inorganic binder such as fireclay.

Here, it is desirable to use 70% or more of the refractory material particles with a particle size in the range of 0.15 mm to 0.5 mm, and 0.15 mm or more.
Particles smaller than mm are difficult to unheat, and particles larger than 0.5 mm are easily peeled off.

The coating layer 6 described above has the role of making the radiation surface A denser and more uneven to increase the amount of radiation heat, and can also protect the flexible fibrous layer 5 from air flow during combustion.

On the other hand, a nozzle hole 8 is provided which opens into the radiation A and is connected to a fuel source.

FIG. 3 shows a burner tile according to the invention, which burner tile has the following features compared to that of FIG.

That is, the radiation surface A is not step-like, and the fibrous layer 5 does not extend to the inner peripheral surface of the nozzle hole 8.

Further, the main body 4 is surrounded by a metal casing 9 to protect it from mechanical shock and the like and to facilitate attachment to the furnace wall 2 or the like.

Further, a nozzle cylinder made of heat-resistant metal is inserted inside the nozzle hole 8 .

That is, these differences will be determined as appropriate depending on the application and manufacturing method.

Next, more detailed examples of the burner tile manufacturing method of the present invention will be described below.

First, for the fiber layer 5, 100 parts of crystallized mullite fiber with an alumina content of 72%, 3 parts of colloidal silica as a binder, and 5 parts of starch are dispersed in a large amount of water, and the desired fiber layer is formed in this. A mold in which a wire mesh having a shape similar to 5 was made was placed in the mold, and the inside of the mold was vacuum-sucked.

A uniformly thick layer of a mixture of crystallized mullite fibers and binder was formed on the surface of the mold, and the thickness was 20 mm.

The thus formed product was thoroughly dried in a dryer at 100 degrees Celsius.

Next, as main body 4, 50 parts of alumina/silica fiber,
50 parts of crystallized mullite fiber, 5 parts of polymeric acrylic resin
10 parts of colloidal silica, and 100 parts of alumina of 44 microns or less were thoroughly kneaded into a rice cake shape.

Next, as a coating material for coating layer 6, 2 parts of crystallized mullite fiber, 83 parts of mullite powder with a particle size of 0.2 mm to 0.5 mm, 5 parts of methyl cellulose, and 10 parts of colloidal silica are mixed, and then water is added. An appropriate amount was added and further mixed to form a batter.

After the above, the material for the main body 4 in a soft state is stamped and molded on the fibrous layer 5, and then the fibrous layer 5
A coating layer 6 was formed by applying a coating material to the surface of the substrate with a trowel.

The nozzle holes 8 may be formed at the stage of forming the fibrous layer 5 and the main body 4, respectively, or they may be drilled together at the end using a drill or the like.

(Effects of the Invention) The embodiments of the radiant cup burner tile of the present invention are as described above, and the effects thereof are listed below.

(1) The burner tile of the present invention has the structure described in the claims, and in particular has a fibrous layer made of inorganic fibers, so thermal shock is absorbed by the intertwining of the fibers and no damage or cracks occur. .

(2) The burner tile of the present invention has the same structure as above, and in particular, since the fibrous layer has heat insulating properties, the heat insulating properties extremely reduce energy loss.

(3) The burner tile of the present invention has the same structure as above, and in particular has a coating layer, so the amount of radiated heat is extremely large.

(4) The burner tile of the present invention has the same structure as above, and in particular, the main body is made by molding a ceramic fiber paste, so it is lightweight, easy to mass produce, and easy to process.

(5) The burner tile of the present invention has the same structure as above, and the main body is particularly resistant to thermal shock because it is made of ceramic fiber.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a burner tile together with a furnace, Fig. 2 is a longitudinal sectional view of the burner tile of the present invention, Fig. 3 is a longitudinal sectional view of another burner tile similar to the above, and Fig. 4 is a longitudinal sectional view of a conventional burner tile. A front view, and FIG. 5 is a cross-sectional view of FIG. DESCRIPTION OF SYMBOLS 1... Furnace, 2... Furnace wall, 3... Burner tile, 4... Main body, 5... Fibrous body layer, 6... Coating layer, 8... Nozzle hole, 9... Casing,
10... Nozzle tube, A... Radiation surface.

Claims (1)

[Claims] 1. A main body made by molding a paste of ceramic fibers, a flexible fibrous layer formed from inorganic fibers fixed to the radial side surface of the main body, and refractory material particles attached to the surface of the fibrous layer. A radiant cup burner tile comprising a coating layer consisting of a radiant cup and a nozzle hole connecting the radiating surface to a fuel source.