JPH11335668A - Repair of wall of carbonization chamber in coke furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for repairing damage of the brick walls in a carbonization chamber of a coke furnace that improves the efficiency of repairing the damages of the walls in the carbonization chamber such as tile joint breakage or tile cracking and can inhibit the incomplete combustion or black smoke occurrence due to leakage of the coke furnace gas into the combustion chamber. SOLUTION: When the carbonization chamber is repaired by blowing fine particles of a fire refractory material (dusting material) in the carbonization chamber, two kinds of dusting materials having different particles sizes from each other are used. At first, a dusting material containing >=40% of the particles of 74 μm or larger particle sizes (the coarse material) is blown, and subsequently another dusting material containing >=80% of less than 44 μm particle sizes (conventional dusting material) is blown.

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 damage such as joint breaks and cracks generated in a coke oven wall brick of a coke oven furnace.

[0002]

2. Description of the Related Art In a coke oven furnace, a heat storage chamber is provided at a lower portion of a furnace body, and a combustion chamber composed of 20 to 30 flue and a carbonization chamber for carbonizing coking coal are alternately arranged at an upper portion thereof. Have been. Combustion gases and air are preheated in a regenerator,
After being introduced into the combustion flue and burned, the heat is recovered in the adjacent heat storage chamber via the withdrawal flue and discharged through the flue.

[0003] The coking coal charged into the coking chamber is burned by indirect heating through the furnace walls from the combustion chambers on both sides, and the generated coke is extinguished by a ram mounted on the extruder through a coke guide wheel. The cycle of extruding into a car or bucket car, charging coking coal into the carbonization chamber again, and firing is repeated.

[0004] For this reason, the furnace wall brick of the carbonization chamber is subjected to the temperature fluctuation from room temperature to 1200 ° C every time due to the repetition of such a cycle, and is subjected to friction and extrusion stress generated at the time of coke extrusion. Damage such as joint breakage, rough skin, penetration, cracks, defects, etc. occurs. In addition, when the operation rate is low,
If there is a periodical repair of mobile equipment such as a cork guide car, or interruption of kiln removal work due to repair of incidental equipment,
Joint breaks occur in the furnace wall brick. In particular, it is said that if the low-load operation continues, many joint breaks occur in the furnace wall brick at the upper part of the carbonization chamber.

[0005] If these damages are left as they are and coking coal is charged into the carbonization chamber and carbonization is continued, the generated coke oven gas leaks into the combustion chamber through the joint cut, causing incomplete combustion. In addition to hindering operation, the furnace body strength and furnace life may be reduced, and black smoke from the chimney may cause pollution problems.

As a method of repairing the damage in the carbonization chamber of the coke oven described above, there are a method of spraying mortar to the damaged portion with a spray nozzle, and a method of burning a thermal spray repair material by using carrier oxygen and welding it to the damaged portion. In order to carry out the method, there is a problem that the target carbonization room must be set to an empty kiln due to the work time, and the number of repairs is greatly restricted.

[0007] Therefore, in a method generally used in the past, a fine powder of refractory material (hereinafter referred to as "da") is provided in the carbonization chamber while the pressure inside the carbonization chamber to be repaired is maintained at a higher pressure than the combustion chamber. A method of blowing a dusting material along with compressed air, placing the dusting material on the air flowing from the carbonization chamber to the combustion chamber through a joint break, filling the damaged portion such as the joint breakage, and closing the dusting material. It is.

FIG. 1 is a diagram schematically showing a mechanism of repairing a carbonized chamber wall by dusting material.
The gap between 1-2 and penetrating from the carbonization chamber side to the combustion chamber side is a crack generated in the carbonization chamber. FIG. 1A shows a state in which mortar particles 2 of dusting material (using mortar) blown into the carbonization chamber penetrate into the crack due to a differential pressure. (B) shows a state in which the mortar particles 2 are being filled inside the crack, and (c) shows a state in which the mortar particles 2 have started melting by furnace heat. (D) shows a state when about one hour has elapsed after the start of blowing, in which the mortar particles, that is, the dusting material are sintered and the cracks are closed.

As a specific example of this method, for example, Japanese Patent Publication No. 51-13481 discloses a method in which a dusting material (dry mortar) is blown into a carbonization chamber together with compressed air from a riser pipe, and the pressure in the carbonization chamber is increased. A method is disclosed in which the dusting material is filled in joints of the furnace wall of the coking chamber and the joints are closed.

In Japanese Patent Application Laid-Open No. 53-67701, a dusting material (dry mortar) is dropped from a hopper into a pipe attached to a lower portion of the hopper,
A method of blowing dry mortar, in which compressed gas is injected from at least two nozzle tips inserted and fixed from one end of the hopper lower pipe when blowing into the carbonized chamber with increased pressure together with the compressed gas introduced from one end of the pipe. Proposed. According to this method, there is no blockage due to the deposition of the dry mortar in the middle of the piping, the diffusion of the dry mortar into the coking chamber is very good, and the filling of the dry mortar into the joint of the furnace wall of the coking chamber is good. It has become.

However, the methods disclosed in JP-B-51-13481 and JP-A-53-67701 both extrude coke and then carbonize the coke as described in Examples. This is a method of repairing joint breaks in the entire carbonization chamber by setting the chamber to an empty kiln. If a large number of tests are carried out in a short period of time, the coke productivity will decrease accordingly. In addition, both methods have a large effect on other operations, and thus have a problem in workability, and also have a problem in the filling efficiency of the dusting material.

[0012]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems in the conventional repair method, and makes it possible to cut off the joints of the carbonization chamber wall.
Carbonization that can improve the repair efficiency of cracks and other damages (meaning the efficiency of filling joints and cracks, etc.) and prevent incomplete combustion and the generation of black smoke due to leakage of coke oven gas into the combustion chamber It aims to provide a method for repairing room walls.

[0013]

SUMMARY OF THE INVENTION The gist of the present invention resides in the following method for repairing a coke oven carbonization chamber wall.

A method for repairing a wall of a coke oven carbonization chamber, wherein a damage such as a joint break or a crack generated in a brick wall of a coke oven chamber of a coke oven is repaired by blowing dusting material (refractory material fine powder) into the carbonization chamber. First, a dusting material containing at least 40% of particles having a particle size of 74 μm or more is blown, and then a dusting material containing 80% or more of particles having a particle size of 44 μm or less is blown using two types of dusting materials having different particle sizes. A method for repairing a wall of a coke oven carbonization chamber, characterized in that: In addition,
“%” Of the particles of the dusting material means “% by mass”.

The present inventors have conventionally used one type of dusting material as a material to be blown into the carbonization chamber, whereas the present inventors have used two types of dusting materials having different particle sizes, that is, those having coarse particles. The present inventors have found that repair efficiency can be improved by performing a composite blowing of continuously blowing relatively fine particles into the carbonization chamber, and have accomplished the present invention described above.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for repairing a wall of a coke oven carbonization chamber of the present invention (method of the present invention) will be described in detail.

In the method of the present invention, two kinds of dusting materials having different particle sizes are used. The effect of blowing only one kind of material differs depending on the width of the crack, the filling efficiency is low, and the repair effect is low. Because there is a limit.

First, particles having a particle size of 74 μm or more
A dusting material containing 0% or more is blown, followed by a particle size of 4%.
The reason why the dusting material containing 80% or more of particles having a particle size of 4 μm or less is blown is to increase the filling efficiency of the two types of dusting materials as a whole.

The above definition in the method of the present invention is based on the following investigation results.

First, the results of an investigation on the effect of the material particle size on the filling efficiency of the dusting material into joints and cracks having different widths will be described. If the filling efficiency is good, it can be said that the repair effect is large.

Table 1 shows the dusting materials used (hereinafter referred to as “dusting materials”).
(Also referred to simply as “material”). Three kinds of materials were used, which are "coarse-grained material", "normal material" and "fine-powder material", respectively. “Normal material” is a material that is conventionally used. In Table 1, for example, 7
4 μm or more means above a sieve that does not pass through a sieve with a nominal size of 74 μm, and 44 μm or less means below a sieve that passes through a sieve with a nominal size of 44 μm.

[0022]

[Table 1]

FIG. 2 shows a schematic configuration of the test apparatus. This apparatus has a simulated carbonization chamber 3 for floating a material by blowing air (air blowing) and a simulated combustion chamber 4 for sucking the material, and two refractory bricks 5 are provided between the two chambers.
A gap was formed at -1, 5-2 to form a simulated crack 6. The simulated combustion chamber 4 is provided with a suction port 7 and a water manometer 8 for sucking air in the room to reduce the pressure.
Further, a differential pressure adjusting hole 9 for adjusting the pressure difference between the simulated carbonization chamber 3 and the simulated combustion chamber 4 is provided.

Using this test apparatus, air is blown into the simulated carbonization chamber 3 at normal temperature to suspend the material,
From a suction opening 7 by sucking air in the simulated combustion chamber 4 the pressure difference between the two chambers and 10, 30 or 50 mm H ₂ O, filled in simulant fissure 6 after a predetermined time (1-15 minutes) elapsed materials Was measured. At that time, the crack width was changed in the range of 0.1 to 1 mm (the length of the crack was constant at 200 mm). The amount of the material filled in the simulated crack 6 was measured by measuring a weight change of the refractory bricks 5-1 and 5-2 before and after the test. The amount of the filled material was converted to a filling rate, with the case where the simulated crack 6 was completely filled with the material being 100%, and the higher the filling rate, the better the repair effect.

An example of the test results (the differential pressure between the two chambers is 10 mm
H ₂ O) is shown in FIG.

From these results, it was reconfirmed that the "ordinary material" had a small effect on fine cracks having a small width. Further, the “fine powder material” had little effect on cracks of any widths tested. This is considered to be because fine powder was condensed during bubbling before blowing due to the effect of surface tension, resulting in coarse powder, and the effect of floating filling was reduced.

On the other hand, in the case of the "coarse-grained material", an effect was particularly observed for fine cracks. This is because, as the particle size increases, the penetration into the cracks decreases as a whole, but when the particle size is large, the cracking property on the inner wall of the cracks improves, especially when passing through fine cracks, the effect is large, Therefore, it is considered that the filling property was improved. On the other hand, the effect was slightly reduced for cracks of normal width. The crack having a normal width means a crack having a width of about 0.5 to 1.0 mm on the combustion chamber side.

From these results, it was proved that the effect of each material having a different grain size composition was different depending on the width of the crack, and that only one type of material was blown, resulting in a low filling efficiency and a limited repair effect.

Next, the results of a blow test (ie, a composite blow test) of two types of materials will be described.

The materials and test equipment used are the same as those described above. If two kinds of materials are blown at the same time, the result is substantially the same as blowing one kind of material.
The total blowing time was divided into the first half and the second half, and different materials were blown under the same conditions.

Table 2 shows the pattern of the composite blowing. “Coarse-grained material” and “normal material” in the table correspond to “coarse-grained material” and “normal material” shown in Table 1 above, respectively. In addition, "fine powder material" which had a small effect on cracks of any width was not used. Also, for example, Case 1
“Coarse-grained material” + “ordinary material” indicates that “coarse-grained material” was blown in the first half of the total blowing time, and subsequently (ie, continuously) was blown in the latter half.

[0032]

[Table 2]

FIG. 4 shows the test results of the composite blowing. From this result, it can be seen that, compared to the single blowing in which one type of material is blown, the composite blowing has a larger amount of material deposited in the cracks in all the investigated crack widths, and the filling property is improved.

In the order of blowing, "coarse-grain material"
"Case 1" is the "normal material" in the first half
Was more effective than the case of blowing (Case 2).
This is because the `` coarse grain material '' first catches on the inner wall of all cracks regardless of the crack width, and blows the latter half of the `` normal material '' in a state where projections are formed and the catching is more likely to occur, It is considered that the adhesion of the “normal material” blown in the latter half in the crack was improved. That is, by blowing in the order of Case 1, the filling efficiency of the entire material can be increased, and the repair effect can be improved. When "normal materials" are injected in the first half (Case 2)
Because the "coarse-grained material" is blown into the narrowed gap after the "normal material" has adhered, the "coarse-grained material" blown in the latter half cannot penetrate into the gap, reducing its effect. ,
It is considered that the overall effect was reduced. The reduction in this effect was particularly pronounced on the microcrack side.

In view of the test results described above, in the method of the present invention, two types of dusting materials having different particle sizes are used, and "coarse-grain material" is first blown, and then "normal material" is blown. . The “coarse-grained material” may be any material having a particle size configuration including 40% or more of particles having a particle size of 74 μm or more. Although the upper limit of the particle diameter of the particles having a particle diameter of 74 μm or more is not particularly defined, the maximum diameter of the particles constituting the “coarse-grained material” used in the above test (the particle diameter of the largest particle passing through a 150 μm sieve) ) Is preferable. The “ordinary material” may be any material having a particle size configuration including 80% or more of particles having a particle size of 44 μm or less. If the material satisfies these conditions, that is, the conditions specified by the method of the present invention, it is possible to improve the filling efficiency and enhance the repair effect.

The material of the dusting material is not particularly limited. Any material may be used as long as it floats in the carbonization chamber, penetrates into joint breaks, cracks, and the like due to the pressure difference with the combustion chamber, is filled therein, and is sintered by furnace heat. The sintering temperature was adjusted by adding an inorganic binder powder as a sintering material to the conventionally used dry mortar, fine powder of refractory material such as silica stone, pyrolite, chamotte, alumina, or fine powder of refractory material. And a mixture of a thermosetting resin powder and a refractory fine powder.

The objects to be repaired by the method of the present invention are mainly joints and cracks generated in the coke oven wall bricks of the coke oven, but are also effective for damage such as rough skin.

According to the method of the present invention, the efficiency of repairing damage such as joint breaks and cracks in the carbonization chamber wall (the efficiency of filling the cracks and the like with dusting material) is improved, and the coke oven gas leaks into the combustion chamber. Prevent incomplete combustion and black smoke caused by
Disturbance on operation can be prevented beforehand. As a result, it is possible to suppress a decrease in the strength of the furnace body and extend the life of the furnace.

[0039]

EXAMPLE In a coke oven group having a furnace height of 6000 mm and a furnace width of 450 mm and a total furnace length of 15600 mm and consisting of 106 gates, burn-off or spray-repair of the carbon kiln and kiln 2 to 3 hours after the completion of the above, before the start of coal charging for charging the raw coal, the two types of dusting materials ("coarse-grained material" and "normal material" shown in Table 1) were used in the first half, It was blown continuously in the second half, and joint repair of bricks in the carbonization chamber wall was carried out.

The blowing was performed in the pattern of Case 1 (see Table 2), and the change in the amount of black smoke generated from the chimney before and after the joint repair was examined. For comparison, a similar investigation was conducted for a conventional method in which only a conventional “normal material” was blown.

FIG. 5 shows the results of the investigation. The transition of the amount of generated black smoke was measured by measuring the soot concentration, and expressed in comparison with the average soot concentration during normal operation. The elapsed days on the horizontal axis are the days after the joint repair.

As shown in FIG. 5, in the conventional method in which only the “normal material” was blown, the generation of black smoke could not be suppressed even four or five days after the repair was performed. In the case of "granular material" + "normal material"), the generation of black smoke could be almost completely suppressed after a lapse of one or two days.

[0043]

According to the method of the present invention, the efficiency of repairing damage such as joint breaks and cracks in the carbonization chamber wall is improved, and incomplete combustion and generation of black smoke due to leakage of coke oven gas into the combustion chamber are achieved. Can be prevented, and troubles on the operation can be prevented beforehand.

[Brief description of the drawings]

FIG. 1 is a view schematically showing a repair mechanism of a carbonization chamber wall by a dusting material.

FIG. 2 is a diagram showing a schematic configuration of a test apparatus for investigating a repair effect of a dusting material.

FIG. 3 is a diagram showing the effect of the particle size of a dusting material on the filling rate of cracks.

FIG. 4 is a diagram showing the effect of composite blowing of a dusting material on the amount of material deposited on cracks.

FIG. 5 is a diagram showing a change in the amount of black smoke generated when the method of the present invention and the conventional method are performed.

[Explanation of symbols]

 1-1, 1-2: Furnace wall brick 2: Mortar particles 3: Simulated carbonization chamber 4: Simulated combustion chamber 5-1, 5-2: Refractory brick 6: Simulated crack 7: Suction port 8: Water manometer 9: Difference Pressure adjustment hole

Claims (1)

[Claims] 1. A method for repairing a wall of a coke oven carbonization chamber for repairing damage such as joint breaks and cracks generated in a brick wall of a carbonization chamber furnace of a coke oven by blowing refractory material fine powder into the carbonization chamber.
First, a refractory fine powder containing at least 40% of particles having a particle size of 74 μm or more is blown, and then a fine powder of refractory material containing at least 80% of particles having a particle size of 44 μm or less is used. Repairing the wall of the coke oven carbonization chamber, characterized by blowing air.