JPS5833189B2 - Thermal spraying material for coke oven wall repair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder spraying material used when repairing a damaged part of a coke oven wall by flame spraying.

In a coke oven, after dry distilling the coal charged in the carbonization chambers arranged alternately with the heating chambers, the lids on both the extrusion side and the coke side are removed, and the coke is poured into the fire extinguishing truck by the extruder through the coke guide car. Manufactured.

However, when the lid of the carbonization chamber is opened, the furnace wall of the carbonization chamber is heated to a high temperature, and in particular, the furnace wall bricks and brick joints near the opening are abraded by the extruded coke, and spalling is caused by repeated heating and cooling. This causes large cracks or holes leading to the heating chamber - causing inhibition of dry distillation of coal and shortening the life of the furnace.

As a countermeasure to this problem, a method of repairing the damaged part of the bricks near the furnace lid using a wet method (a mixture of refractory powder and water) has traditionally been adopted, but with this method, the strength of the refractory powder is not generated, It was only a very temporary measure that would easily peel off with the slightest shock.

Recently, technology to spray refractory brick materials has been used to repair coke oven walls, but since it uses a refractory material with a high melting point, the adhesion of the thermal spray is weak and it easily peels off. .

The present inventors conducted many experiments on the type and composition of refractory materials based on the conditions required for thermal spraying materials for the purpose of repairing openings such as joint breaks and cracks in coke oven walls and repairing damaged areas. As a result of experiments, it was found that mixing At203 and 5i02 forms an amorphous phase and increases thermal spray adhesion.

The present invention is constructed by adding lower melting and viscosity to this knowledge.

That is, this invention ij:5i02: Section 30-95, A
403: 5 to 70 y, and further Fe203 y
CaOt Na2O, Ni20, B2O3, PbO
This is a thermal spray material for repairing coke oven walls, which contains one or more of the following, and the total amount thereof is 20% or less.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

In the present invention, the refractory powder is mainly composed of A403 and 5i02, which is sprayed onto the openings and worn parts of the coke oven wall.

A403 is used because it has high hot strength, high fire resistance, and excellent wear resistance.

5i02 is used as the main component because it is easily compatible with the coke oven wall material, has low thermal expansion, is wear resistant, and is stable against CO gas.

A like this, /,! 03 and SiO2 not only have the above effects, but also generate a glass phase (amorphous phase), increase adhesion as shown in the figure, and maintain airtightness of the carbonization chamber.

Such an effect depends on the blending amount of the main component, but the effect is not suitable for use as a powder spray material for coke oven walls no matter the blending amount.

In other words, the blending amount of the main component should be determined based on the conditions required by the thermal spray material, and the blending amount of A403 should be between 5 and 70 parts, and if it is less than 5 parts, the hot strength and abrasion resistance will be low. However, the adhesion force is weak, and an excessive amount exceeding 70% will weaken the adhesion force.

5i02, the ratio is set at 30 to 95 due to the above-mentioned effects, and if the composition deviates from this range, the properties of the thermal spraying material for repair will be lost.

The melting temperature of the combined addition of A403 and SiO2 is lower than the melting temperature of each of them, but from the viewpoint of workability, it is preferable to melt at a temperature as low as possible.

For this purpose, Fe2O3, Ca02Na20, Ka2
0, B2O3, and PbO, and the total amount thereof is 20φ or less.

In this case, the lower limit may be a trace amount (preferably one or more).

These blended components, such as Fe2O3 and CaO, show a low melting effect as the blended amount increases, but if the blended amount exceeds 20%, the blended amount of the main component will decrease, and the properties necessary for the thermal sprayed material will be lost. be exposed.

The thermal spray powder material blended as described above has good workability because it is a low melting material, and can be used for repair work with a high adhesion force.

Examples of the present invention will be described below.

Feldspar, calcined silica, silica flower, soda lime glass waste,
Powder thermal spray materials were manufactured by arbitrarily selecting materials such as lowite, borax, soda ash, and clay.

Tables 1 and 2 show the thermal spraying components, adhesive strength, gas sealing properties, and abrasion resistance at that time.

As is clear from Tables 1 and 2, SiO2 and A
Comparative Examples ■ and @, in which t203 is outside the range of the present invention, have low adhesive strength, poor abrasion resistance, and poor gas sealing properties.

Also S i02 and AI! , 203 are within the range of the present invention, Comparative Examples 0 and 0, which do not contain a low melting promoting component, have low adhesive strength and cannot be said to have good gas sealing properties.

Comparative Example 0, which contains an excessive amount of the low melting promoting component, has low wear resistance.

Compared to these comparative products, the products of the present invention are superior in adhesive strength, gas sealing properties, and abrasion resistance, and the sprayed materials of the present invention are suitable as sprayed materials for repairing coke oven walls.

[Brief explanation of the drawing]

The drawing is a diagram showing the blending amounts of A403' and SiO2 and their adhesion resistance.

Claims (1)

[Claims] I5in2: 30~95, At203: 5~
Blend at 70 yen, and further add Fe2O3j CaO, Na2
OjK20. A thermal spraying material for repairing coke oven walls, containing one or more of B2O3 and PbO, with a total amount of 20 parts or less.