JP2002201477A - Method for repairing coke oven opening - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for repairing the opening of a coke oven which surely repairs a joint defect and a damaged portion by a simple method even when the joint defect and the damage of the oven wall bricks in the opening of the coke oven are caused at the same portion and enables the prolongation of the life of the repaired portion. SOLUTION: The method for repairing the opening of a coke oven comprises spraying a liquid repairing material 21 containing an inorganic binder on to portions 18 and 19 to be repaired in the oven wall within the oven of the opening of the coke oven to form a primary coat, and then spraying a refractory repairing material 22 containing an inorganic binder and a refractory powder as the upper coat for the above primary coat-sprayed repaired portions of the oven wall within the oven.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a coke oven opening, and more particularly, to a coke capable of reliably repairing both a joint break portion and a brick missing portion of a furnace wall brick by a simple method. It relates to a furnace kiln repair method.

[0002]

2. Description of the Related Art Conventionally, coke for blast furnaces in steelworks,
A coke oven is used in the production of coke such as coke for casting. The coke oven, as shown in FIG.
It has a furnace body structure in which carbonization chambers 1 and combustion chambers 2 are arranged alternately. Charging coal into the carbonization chamber 1 and flowing high-temperature combustion gas through the combustion chamber 2 make the combustion gas This is a facility that transfers sensible heat to coal in the coking chamber through furnace wall bricks (partition walls), carbonizes the coal and produces coke.

In FIG. 2, 1 is a carbonization chamber, 2 is a combustion chamber, 3 is a coal charging inlet, 4 is a kiln, 5 is an extruder, 5a is a pusher (: ram), 6 is a fire extinguisher, 7 is Cork guide wheel, 8 Sotansha, 9 regenerator, 10 riser 11 is dry main, 12 coal tower, 13 pinholes, f ₁ is the moving direction of the extruder 5, f ₂ is the pusher (: Ram) 5a moving direction, LD
Indicates the furnace length direction.

[0004] Since coal carbonization is performed at a high temperature exceeding 1000 ° C, the furnace body is made of refractory bricks. Coal is charged from a coal charging inlet 3 in the upper part of the coking chamber 1, and after carbonization, the doors of the kiln ports 4 on both sides in the furnace length direction LD are removed, and the coke generated by the extruder 5 is discharged to the kiln on the side of the coke guide vehicle 7. The extruded coke is discharged to the fire extinguishing vehicle 6.

FIG. 3 is a horizontal sectional view of a kiln opening of a coke oven and a furnace brick in the vicinity of the kiln opening. In FIG.
1 is a carbonization room, 2 is a combustion room, 15 is a kiln opening, 16 is a furnace wall brick,
Reference numeral 17 denotes flue, 18 denotes a furnace wall brick defective portion (hereinafter also referred to as a defective portion), and 19 denotes a joint break.

In FIG. 3, the furnace hardware and the door are not shown. In the combustion chamber 2, the flue 17 through which the combustion gas flows is made of refractory brick, and the furnace wall brick 16, which is the refractory brick on the carbonization chamber 1 side, serves as a partition wall between the combustion chamber 2 and the carbonization chamber 1. I have. As described above, at the time of extruding coke after carbonization, the kiln opening 15 and the furnace wall brick 16 near the kiln opening 15 are exposed to outside air every time in order to open the kiln opening. And receives the heat history of heating and cooling.

For this reason, the kiln opening 15 and the brick near the kiln opening 15 repeat expansion and contraction. In addition, combustion chamber 2
Furnace wall brick 16 is extruder side, fire extinguishing car side is supported by the furnace body metal and is compressed, but the joint between the bricks opens over time due to the expansion and contraction of the brick, the joint breakage May occur.

[0008] Furthermore, coke extrusion is an operation of mechanically extruding coke from the extruder side to the kiln opening of the coke guide vehicle side by a pusher, so that the furnace wall brick 16 is mechanically worn due to contact with the coke. May be lost. In particular, in the kiln mouth and in the vicinity of the kiln mouth, the above-mentioned heat history is also added, and joint breakage and breakage are likely to occur.

As described above, in the kiln mouth and in the vicinity of the kiln mouth, the joint breakage and the loss progress at the same location, and often cause large damage. When the joint break occurs, the carbonization gas (coke oven gas) generated during coal carbonization in the carbonization chamber 1 shown in FIG.
17 and black smoke may be generated as combustion exhaust gas due to incomplete combustion of the carbonized gas that has flowed.

[0010] When a defect 18 is formed in the furnace wall brick 16,
When extruding coke after carbonization, coke is caught by the defective portion 18 and cannot be extruded, causing process defects such as so-called compaction,
As the loss progresses, there is a danger of fire wall brick collapse,
The joint breaks and defects in the furnace wall brick 16 need to be repaired promptly.

Conventionally, a joint repair method has been disclosed in
As disclosed in JP-A-11-335668, a dusting method in which a refractory material fine powder is permeated into joint joints by utilizing a pressure difference between a pressure in a carbonization chamber and a pressure in a combustion chamber and sintered is disclosed,
A spraying method of spraying a mixture of a refractory powder and a binder such as water glass to a joint cut portion as disclosed in Japanese Patent No. 267559 is known.

As a method for repairing the defective portion, a wet spraying method in which refractory powder is sprayed in a wet manner, and a method in which refractory powder is sprayed by a spraying burner are known. As described above, the conventional method for repairing a joint break and the method for repairing a defect are described.However, in the case of a kiln opening, when the above-described joint break occurs in the vicinity of the kiln opening, the above-described conventional joint break repair method is Although it is suitable for feeding refractory powder into a narrow joint to close the joint, it was difficult to form a high-strength repair layer on the surface of the defect.

On the other hand, it is difficult to form a repair layer deep into a narrow portion such as a joint break by the conventional method for repairing a defective portion. Even if the repair layer is formed, the repair layer is liable to crack and the same problem as in the joint break state is likely to occur.

[0014]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art. Even when joint breakage and breakage of furnace wall bricks occur at the same location in a coke oven kiln, joint breakage and breakage occur. An object of the present invention is to provide a method of repairing a coke oven kiln opening capable of reliably repairing a defective portion by a simple method and extending the life of the repaired portion.

[0015]

SUMMARY OF THE INVENTION The present invention is directed to a method for repairing a furnace wall of a coke oven kiln, which comprises spraying a base material with a liquid repair material containing an inorganic binder, and then spraying the base furnace with the base material. A method for repairing a coke oven kiln characterized by spraying a refractory repair material containing an inorganic binder and a refractory powder as an upper layer of a wall repair location.

In the present invention, the liquid repair material (wet amount) has an inorganic binder content (dry amount) of 5 to 65 mass%.
(Hereinafter, mass% is described as%), and the water content is preferably 35 to 95% (first preferred embodiment of the present invention). Further, in the above-described present invention and the first preferred embodiment of the present invention, the refractory repair material has an inorganic binder content (dry amount) of 0.5.
The content of the refractory powder (dry) is preferably 5 to 30%, and the content of the inorganic binder (dry) of the refractory repair material is 1 to 20%. More preferably, the powder content (dry amount) is 80 to 99% (the second preferred embodiment and the third preferred embodiment of the present invention).

Further, in the present invention and the first to third preferred embodiments of the present invention, the refractory repair material preferably has a water content of 3 to 20%. More preferably, the water content is 3 to 15% (fourth to seventh preferred embodiments of the present invention). Also,
In the present invention described above, in the first to seventh preferred embodiments of the present invention, the inorganic binder of the refractory repair material is the same inorganic binder as the inorganic binder of the liquid repair material. Preferred (eighth to fifteenth preferred embodiments of the present invention).

Further, in the present invention and the first to fifteenth preferred embodiments of the present invention, the inorganic binder is preferably water glass. When water glass is used as the inorganic binder in the first and fifteenth preferred embodiments of the present invention and the present invention described above, the content of water glass in the inorganic binder content (dry amount) is as follows. Shows the solid glass content of water glass.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The present inventors have conducted intensive studies in order to solve the above-described problems of the prior art, and as a result, in the repair of the coke oven port, first, in the in-furnace furnace wall repair location of the coke oven port,
After spraying a liquid repair material containing an inorganic binder,
The following effects (1) to (4) were found to be obtained by spraying a refractory repair material containing an inorganic binder and a refractory powder as an upper layer of a furnace wall repair location where the base was sprayed. The present invention has been reached.

(1) Effect based on the use of a liquid repair material: The repair material is filled even in a fine joint break, and the joint break can be repaired. (2) Effect based on the use of a liquid repair material containing an inorganic binder (base spraying material): The inorganic binder fills and repairs the gaps at joint joints, and the inorganic binder of the base spray material is used. Through this, the adhesion strength of the refractory powder in the refractory repair material to the brick surface exposed at the defective portion is improved.

(3) Effect based on use of refractory repair material containing inorganic binder and refractory powder: (3-1) Inorganic binder and liquid repair material in refractory repair material (base spraying material) The synergistic effect of the two inorganic binders further increases the holding power of the refractory repair material on the brick surface exposed at the defect. (3-2) The compressive strength of the refractory repair material, which is the upper layer of the base material, is improved by the inorganic binder in the refractory repair material.

(4) Even in the case where a break in a brick and a break occur in the same place, it is possible to reliably repair both the break and a break in the brick by a simple method and extend the service life of the repair place. it can. That is, the present invention, after spraying a liquid repair material containing an inorganic binder on the furnace wall repairing part of the coke oven kiln mouth, as an upper layer of the furnace spraying furnace furnace wall repairing part sprayed, This is a coke oven opening repair method in which a refractory repair material containing an inorganic binder and a refractory powder is sprayed.

FIG. 1 shows a method for repairing a coke oven kiln opening of the present invention by a horizontal sectional view of a furnace wall brick on one side of the kiln. Fig. 1 (a) shows the furnace wall brick inside the kiln opening before repair.
FIG. 1 (b) shows a horizontal cross-sectional view of each of the furnace wall bricks at the furnace mouth after the repair. Also, in FIG. 1, 15 is a kiln opening, 18 is a chipped portion, 19 is a joint breakage, 20 is a kiln brick, 21 is a fired body of a liquid repair material (fired body of a base spray material), and 22 is an inorganic bond. refractory repair material containing wood and refractory powder, 23 joints, 24 kiln mouthpiece was 25 door frame, l _W denotes a furnace wall without normal state damaged.

In the present invention, first, a liquid repair material containing an inorganic binder is sprayed on the joint break 19 and the defect 18 which are repair portions. The content of the inorganic binder and the water content of the liquid repair material may be such that the inorganic binder content (dry amount) is 5 to 65% and the water content is 35 to 95% in the liquid repair material (wet amount). preferable.

When the content (dry amount) of the inorganic binder is less than 5%, the amount of the repairing material in the gaps at the joint breaks becomes insufficient, and the surface of the brick exposed at the defective portion is not sufficient. , The holding power of the refractory repair material is reduced. When the content (dry amount) of the inorganic binder is more than 65%, the water content of the liquid repair material is reduced, and the filling of the gaps at the joints becomes incomplete from the fluidity of the liquid repair material.

The spraying amount (wet amount) of the liquid repair material is preferably 50 to 300 kg / m ² , more preferably 100 to 300 kg / m ² , as a unit weight per unit area of the furnace wall in a normal state without damage. More preferably, it is 250250 kg / m ² . If the basis weight described above is less than 50 kg / m ^2, repair effect grout removal area and the defect becomes insufficient, if the basis weight exceeds 300 kg / m ^2, the refractory repair materials and furnace wall bricks Adhesive strength decreases.

In the present invention, it is preferable to use one or more selected from water glass, alumina cement and calcium cement as the inorganic binder of the liquid repair material. In the present invention, it is particularly preferable to use water glass as the inorganic binder of the liquid repair material.

This is because water glass is not only excellent in the filling property of fine joints, but also by using water glass as a binder, the refractory repair material can be retained on the brick surface exposed at the defective portion. This is because the power increases.
As the water glass, a concentrated aqueous solution of alkali silicate (: alkali-silicate glass) is used.

Examples of the above-mentioned alkali include one or more oxides and / or hydroxides selected from Na, Li and K. When water glass is used as the inorganic binder of the liquid repair material in the present invention, the content of water glass in the inorganic binder content (dry amount) indicates the content of water glass in terms of solid content.

In the present invention, as long as the liquid state can be maintained, the liquid repair material is selected from alumina powder, silica powder, alumina-silica powder, calcium cement and the like in addition to the inorganic binder such as water glass. Seeds or two or more kinds can be blended. The method of spraying the liquid repair material to the repaired portion is not particularly limited, but a spraying method in which a pressurized liquid repair material is sprayed using a nozzle can be used.

In the present invention, it is preferable that after the liquid repair material is sprayed on the repaired portion, the liquid repair material is fired by the geothermal heat of the coke oven brick. This is because by firing the liquid repair material before spraying the refractory repair material on the liquid repair material, the formation of pores in the refractory repair material due to the generation of gas such as water vapor from the liquid repair material. This is because a refractory material having high strength can be formed at the repaired portion.

The firing time of the above-mentioned liquid repair material is 10 to 60.
Minutes, more preferably 15 to 45 minutes. This is because if the above firing time is less than 10 minutes, the effect of preventing the formation of pores in the refractory repair material to be applied in the subsequent step becomes insufficient, and if it exceeds 60 minutes, the furnace wall temperature decreases, This is because the firing of the refractory repair material sprayed on the liquid repair material becomes insufficient.

In the present invention, after the liquid repair material is sprayed on the repaired portion, preferably, the above-mentioned liquid repair material is fired, and thereafter, the upper surface of the furnace inner wall repaired portion sprayed with the liquid repair material is used as an upper layer. Spray a refractory repair material containing an inorganic binder and refractory powder. In the present invention, it is preferable that the refractory repair material has an inorganic binder content (dry amount) of 0.5 to 30% and a refractory powder content (dry amount) of 70 to 99.5%,
More preferably, the inorganic binder content (dry amount) is 1 to 20%, and the refractory powder content (dry amount) is 80 to 99%.

When the content of the inorganic binder is less than 0.5%, the binder effect is reduced, and the compressive strength of the repaired part is reduced. When the content exceeds 30%, the viscosity of the refractory repair material is increased, and the spraying work is performed. Becomes difficult. In addition, refractory powder content is 70%
If less, the compressive strength of the repaired part decreases, and if it exceeds 99.5%, the content of the inorganic binder in the refractory repair material is limited, and the refractory repair material is exposed to the exposed brick surface at the defective part. The holding power is reduced, or the workability of the refractory repair material is reduced.

In the present invention, the refractory repair material (wet amount) preferably has a water content of 3 to 20%, and more preferably 3 to 15%. preferable. This is because when the moisture content of the refractory repair material (wet amount) is less than 3%, the workability is deteriorated due to a decrease in the adhesion of the refractory repair material to the repaired part and the like, and conversely, 20%.
%, The temperature of the repaired part decreases due to the latent heat of vaporization of water, and the firing of the refractory repair material becomes insufficient.

The method of spraying the above-mentioned refractory repair material on the repaired portion is not particularly limited, but a spraying method in which a pressurized refractory repair material is sprayed using a nozzle is used. it can. Further, in the present invention, the inorganic binder of the refractory repair material is preferably the same binder as the inorganic binder of the liquid repair material.

This is because, by using the same binder as the inorganic binder for the refractory repair material and the inorganic binder for the liquid repair material, the bond between the base spray material and the upper layer refractory repair material is further strengthened. This is because the holding power of the refractory repair material on the brick surface exposed at the defective portion is further increased. In the present invention, it is preferable to use one or more selected from water glass, alumina cement and calcium cement as the inorganic binder of the refractory repair material.

In the present invention, it is particularly preferable to use water glass as the inorganic binder of the refractory repair material. This is because the use of water glass as the inorganic binder of the refractory repair material increases the holding power of the refractory repair material on the brick surface exposed at the defective portion.

As the water glass, alkali silicate (:
A concentrated aqueous solution of an alkali-silicate glass) is used. Examples of the alkali include one or more oxides and / or hydroxides selected from Na, Li and K. In the present invention, when water glass is used as the inorganic binder of the refractory repair material, the content of water glass in the inorganic binder content (dry amount) indicates the content of water glass in terms of solid content.

Examples of the refractory powder in the present invention include refractory powders containing one or more selected from quartzite, alumina, chamotte, mullite, zircon, zirconia, magnesia and magcro.

[0041]

EXAMPLES The present invention will be described below more specifically based on examples. The actual furnace test of the present invention was performed in repairing the kiln opening on the coke side (guide car side) of the coke oven. That is, the coke oven mouth where the defective portion 18 and the joint cutout 19 shown in FIG. 1A were formed in the furnace wall brick of the coke oven mouth was repaired.

The repair range was from the kiln opening to a depth of 500 mm, and the furnace wall bricks on both sides of the carbonization chamber were repaired.
That is, as shown in FIG. 1 (a), the joint break 19 and the defect 18 which are repaired portions contain water glass (: 95 parts by mass) and fine alumina (: 5 parts by mass) having the following composition. The liquid repair material to be repaired was placed in a pressure vessel, and spray repair was performed using a spray lance.

(Water glass :) Sodium silicate: 47%, lithium hydroxide: 7%, other alkali compounds: 5%, moisture: 41% (solid content: 59)
%) After spraying the liquid repair material, the repair material was fired by geothermal heat of a coke oven brick for about 30 minutes.

Next, as shown in FIG. 1 (b), the liquid repair material was sprayed on the underlayer and fired to form an upper layer of a furnace wall repairing part where water glass and silica powder having the same composition as the water glass were used. Was sprayed with a refractory repair material 22 having the following composition and containing the following refractory powder. (Refractory repair material :) Refractory powder (silica powder): 86.2%, water glass: 8.6%, moisture: 5.2% The refractory repair material was placed in a pressure vessel and sprayed with a spray lance. .

As a result of the actual furnace test, repair of joint breaks and repair of brick defects at the coke oven kiln opening could be performed simultaneously.
In addition, after the above repair of the coke oven kiln, the concentration of particulate matter in the combustion gas in the flue of the combustion chamber corresponding to the furnace wall of the repaired area was measured periodically. After that, it remained below 1/3 of the dust concentration before repairing the coke oven opening.

As a result, according to the present invention, even when joint breaks and breaks in the furnace wall bricks occur at the same location in the coke oven opening, both the joint breaks and the breaks can be reliably performed by a simple method. It was found that it is possible to repair and extend the life of the repaired part.

[0047]

According to the present invention, even when joint breaks and breaks in the furnace wall bricks occur at the same location in the coke oven kiln, the joint breaks and breaks are reliably repaired by a simple method. The service life of the repaired parts can be extended.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a method for repairing a coke oven kiln opening of the present invention, in which a furnace wall brick (a) of a kiln opening before repair and a furnace wall brick (b) of a kiln opening after repair. ) The horizontal cross section of each is shown.

FIG. 2 is a perspective view schematically showing a coke oven.

FIG. 3 is a horizontal sectional view showing a kiln mouth of a coke oven and a furnace body brick in the vicinity of the kiln mouth.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Coalization room 2 Combustion room 3 Coal loading inlet 4 Kiln mouth 5 Extruder 5a Pusher (: ram) 6 Fire extinguishing truck 7 Cork guide truck 8 Coal loading truck 9 Heat storage room 10 Rise pipe 11 Dry main 12 Coal tower 13 Pinhole 15 Kiln mouth 16 Furnace wall brick 17 Flue 18 Chipped part (: hearth wall broken part) 19 Joint cut part 20 Kiln mouth brick 21 Fired body of liquid repair material (fired body of ground sprayed material) 22 Repair material for refractory material 23 Joint part 24 Furnace fittings 25 Door frame f ₁ Moving direction of extruder 5 f ₂ Moving direction of pusher LD Furnace length direction l _w Furnace wall in normal condition without damage

Claims (5)

[Claims] Claims: 1. In the furnace wall repair area of the coke oven mouth,
After spraying a liquid repair material containing an inorganic binder,
A method for repairing a coke oven kiln opening, comprising spraying a refractory repair material containing an inorganic binder and a refractory powder as an upper layer of the in-furnace furnace wall repair location sprayed with the underlayer. 2. The liquid repair material (wet amount) has an inorganic binder content (dry amount) of 5 to 65 mass% and a water content of 35 to 95 mass%.
%. The method for repairing a coke oven kiln according to claim 1, wherein 3. The refractory repair material has an inorganic binder content (dry amount) of 0.5 to 30 mass% and a refractory powder content (dry amount).
3. The method according to claim 1, wherein the content of the coke oven is 70 to 99.5 mass%. 4. The coke oven kiln according to claim 1, wherein the inorganic binder of the refractory repair material is the same inorganic binder as the inorganic binder of the liquid repair material. Repair method. 5. The method according to claim 1, wherein the inorganic binder is water glass.