JPH09264528A - Burner tile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anti-heat shocking characteristic to a burner tile by a method wherein an inorganic fibvou cloth is wound around the burner tile made of refractory material and inorganic fibrous cloth. SOLUTION: An inorganic fibrous cloth 2 such as alumina fibrous cloth or silica fibrous cloth or the like is wound around an outer circumference of a main body of a burner tile 22. Then, to a furnace wall 6 is mounted a burner tile 22 in which the inorganic fibrous cloth 2 wound around an outer circumference of the refractory material 5 is connected to a burner 201 at a burner connecting part 22a. With such an arrangement as above, a superior anti-heat shock characteristic can be attained, and even if a combination with a high speed burner is applied, there is no possibility that a crack is produced and so it is possible to prevent damage at the furnace wall.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a burner tile installed on a furnace wall of an industrial furnace in combination with a burner.

[0002]

2. Description of the Related Art Burner tiles are required to have fire resistance and thermal shock resistance because fuel injected from a burner and combustion air are contacted and mixed inside a cylindrical burner tile and burned at a high temperature. To be done. In recent years, burners have been improved, and burners called high-speed combustion burners have been used. When burning using such a burner, stress due to a large thermal shock acts, and the burner tile is likely to crack. As a solution to such a problem, there has been proposed a burner tile having a triple structure in which a ceramic fiber is wound around a middle cylinder portion (Japanese Patent Laid-Open No. 1-150712).
Issue). However, the ceramic fiber is used for the purpose of absorbing the thermal expansion of the inner cylinder made of a thin specific material, the inner cylinder is made of a material that emphasizes thermal shock resistance, and the outer cylinder is made of strength. As described above, the materials of the inner cylinder and the outer cylinder are different, and the overall structure is complicated. Therefore, a burner tile having a simple structure and excellent thermal shock resistance has been desired.

[0003]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a burner tile having a simple structure and excellent thermal shock resistance.

[0004]

Under such circumstances, as a result of intensive investigations by the present inventors, as a result, surprisingly, the inner cylinder, the middle cylinder, and the outer cylinder are divided into different materials. The inventors have found that a burner tile having excellent thermal shock resistance can be obtained by winding an inorganic fiber cloth without forming such a complicated structure, and have completed the present invention.

That is, the present invention provides a burner tile made of a refractory material and an inorganic fiber cloth, in which the inorganic fiber cloth is wound.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The refractory material used for the burner tile of the present invention is not particularly limited, but examples thereof include alumina cement, bubble alumina, sintered alumina, and fine silica powder, which are appropriately mixed. Is used.

The inorganic fiber cloth used in the burner tile of the present invention is not particularly limited, and examples thereof include glass fiber cloth, alumina fiber cloth, silica fiber cloth and the like. Among these, alumina fiber cloth and silica fiber cloth are mentioned. It is preferable in terms of heat resistance. The opening of the inorganic fiber cloth is not particularly limited, but it is preferably about 1 to 2 mm because it is sufficiently compatible with the refractory material and is also preferable in terms of strength. The shape of the burner tile of the present invention is not particularly limited, and the burner tile is composed of a burner connecting portion and a burner tile body, and examples of the shape of the burner tile body include a columnar shape and a square pole shape.

The burner tile of the present invention is one in which the above-mentioned inorganic fiber cloth is wound, and the winding position is as follows.
Although not particularly limited, the outer peripheral portion of the burner tile body is preferable, and in particular, between the center and 2γ / 3 (γ indicates a radius in the case of a cylinder, and 1/2 in the case of a square pillar) to the outer periphery. Then, it is preferable to use by winding, and further it is preferable to wind around the outer circumference because the reinforcing effect against the tensile stress due to the thermal shock acting on the outer circumference can be ensured. Further, the winding is preferably entirely reinforced by at least one layer, but may be partially reinforced within a range not impairing the effects of the present invention.

The method for molding the burner tile of the present invention is not particularly limited, and there is a method in which an inorganic fiber cloth is set in a molding die, an amorphous refractory material is poured into the molding die to be cured, and then the mold is removed from the die. Can be mentioned.

[0010]

Since the burner tile of the present invention has a simple structure and exhibits excellent thermal shock resistance, there is no risk of cracks or the like even when high-speed combustion is performed in combination with a high-speed burner. It is possible to prevent damage to the furnace wall.

[0011]

EXAMPLES Next, the present invention will be described more specifically with reference to examples, but these are merely examples and do not limit the present invention.

Example 1 The burner tile A of the present invention molded by the following molding method,
The performance of B and C was evaluated by the following test methods. A burner tile D that does not use an inorganic fiber cloth was used as a comparative product.

(Molding method) Using the mold shown in FIG. 1, casting was carried out by the following procedure. As the inorganic fiber cloth, alumina fiber cloth, silica fiber cloth or glass fiber cloth was used. 1. The inorganic fiber cloth 2 was set in the molding die 1 so that the finished product was located at the outer peripheral position. 2. The holding sheet 3 was set inside. 3. Amorphous refractory material 20% alumina cement,
32% of bubble alumina, 40% of sintered alumina and 8% of fine silica powder were poured into the inside 4. 4. Then, the holding sheet 3 was pulled out and lightly vibrated. 5. The refractory material conformed to the openings of the inorganic fiber cloth 2, then cured and then demolded.

(Test Method) Test Device: The device 23 shown in FIG. 2 was used. Burner used: Venturi burner Fuel used: LPG gas pressure: 1 kgf / cm ² Combustion rate: 1 × 10 ⁴ Kcal / h Burner tile body: Cylinder with outer diameter 106 mm x length 120 mm (however, burner side outer diameter 55 mm, refractory brick) It has a hollow cylinder with a side outer diameter of 80 mm.) Heating temperature; In Fig. 2, 1250 ° C in part A, 600 ° C in part B Heating time; 6 hours Positional relationship: Distance between refractory brick 21 and burner tile 22: 5 mm Venturi burner 20 distance: 100mm

The test results are shown below.

[0016] Burner tile Evaluation Burner tile A (Alumina fiber cloth) No abnormality after 6 hours Burner tile B (Silica fiber cloth) No abnormality after 6 hours Burner tile C (Glass fiber cloth) Cracks occurred in 18 minutes 23 minutes Penetration crack burner Tile D (without inorganic fiber cloth) Penetration crack immediately after cracking in 2 minutes

Those not reinforced with inorganic fiber cloth are
While cracks and cracks occurred in a short time, in particular,
Those reinforced with alumina or silica fiber cloth did not crack at all even after 6 hours.

Example 2 An example of a burner tile having an outer periphery wound with an inorganic fiber cloth is shown in FIGS. 3 (a) and 3 (b). From FIG. 3, the burner tile 22 is composed of a burner tile connecting portion 22a and a burner tile body 22b, and the inorganic fiber cloth 2 is wound around the burner tile body. An example of applying the burner tile is shown in FIG. From FIG. 4, the burner tile 22 in which the inorganic fiber cloth 2 is wound around the outer periphery of the refractory material 5 connected to the burner 201 at the burner connecting portion 22a is installed on the furnace wall 6. As a result, even if high-speed combustion occurs inside the burner tile 22 formed in a tubular shape,
No cracks occur in the burner tile 22 and the furnace wall 6.

[Brief description of drawings]

FIG. 1 is a plan view of a molding die for molding a burner tile of the present invention.

FIG. 2 is a diagram of a test apparatus for evaluating the burner tile of the present invention.

FIG. 3 is a perspective view showing an example of a burner tile of the present invention.

FIG. 4 is a partial cross-sectional view showing an implementation example of the burner tile of the present invention.

Claims (3)

[Claims] 1. A burner tile comprising a fire resistant material and an inorganic fiber cloth, wherein the inorganic fiber cloth is wound. 2. The burner tile according to claim 1, wherein an inorganic fiber cloth is wound around the outer circumference. 3. The burner tile according to claim 1, wherein the inorganic fiber cloth is an alumina fiber cloth or a silica fiber cloth.