JP2021130783A - Repair method of coke oven carbonization chamber oven wall - Google Patents

Abstract

To provide a repair method of a coke oven carbonization chamber oven wall which has no risk of damage to function of a combustion chamber, is excellent in work efficiency, rapid, and inexpensive, and can deal with a large breakage hole.SOLUTION: A method for repairing a breakage hole 11 passing through an oven wall 10 dividing a coke oven into a carbonization chamber and a combustion chamber comprises the steps of: holding a blanket-like heat insulation material 12 of a maximum use temperature of 1000°C or higher and 1300°C or lower with a heat insulation material holding tool 14, inserting the material into the carbonization chamber through an oven port of the carbonization chamber or a coal loading port provided on a top of the carbonization chamber, and fitting the heat insulation material 12 into the breakage hole 11 using the heat insulation material holding tool 14; inserting a thermal spray device 15 through the oven port of the carbonization chamber into the carbonization chamber and carrying out thermal spray on a boundary between the heat insulation material 12 and the breakage hole 11 using the thermal spray device 15 to fix the heat insulation material 12 in the breakage hole 11; and forming a thermal spray layer 17 on and around the heat insulation material 12 using the thermal spray device 15 to fill the breakage hole 11.SELECTED DRAWING: Figure 3

Description

The present invention relates to a method for repairing a furnace wall of a coke oven carbonization chamber, and more particularly to a method for repairing a breach penetrating a furnace wall separating the carbonization chamber and the combustion chamber.

In a chamber-type coke oven, carbonization chambers and combustion chambers are arranged alternately, and the carbonization chambers and combustion chambers are separated by a brick wall (furnace wall). Coal is charged into the carbonization chamber, and the combustion gas is burned in the combustion chamber to transfer heat to the carbonization chamber through the furnace wall, and the coal is carbonized to produce coke.
The produced coke is extruded from the carbonization chamber by an extruder, but when the coke is extruded, friction occurs between the coke in the coke chamber and the furnace wall, and the furnace wall is thinned and worn. As the wall thinning and wear progresses, punctures that penetrate the furnace wall that separate the carbonization chamber and the combustion chamber occur. Since coal cannot be charged into the carbonization chamber where the rupture has occurred and it cannot be operated, repair is required.

As a method of repairing a breach penetrating the furnace wall, there are a method of transshipping the brick of the breached portion, a method of closing the breach with a refractory or the like, and then spraying from above to repair the breach.
For example, in Patent Document 1, an amorphous refractory is adhered to the fracture surface of the fractured portion by a refractory holder inserted from the inlet to form an amorphous refractory layer, and a thermal spraying device inserted into the carbonization chamber is used. A method of forming a thermal spray layer on an amorphous refractory layer formed in a puncture portion to close the rupture is described. If the opening of the rupture is large, an amorphous refractory layer is formed on the fracture surface of the rupture, and the refractory adherent combustible plate inserted from the inlet is pressed against the irregular refractory layer of the rupture to temporarily. It is fixed and a sprayed layer is formed on the surface of the refractory-adhered combustible plate and the wall surface of the furnace around it to close the puncture.

In Patent Document 2, a heat-resistant backing plate held by a plate holding jig is inserted through an inspection opening of a sprayed spraying chamber, and the heat-resistant backing plate is pressed against the damaged through hole from one side of the damaged through hole. A repair method including a step of closing a spraying material and a step of arranging a spraying lance for spraying the sprayed material on the other side of the damaged through hole and spraying the sprayed material from the sprayed nozzle of the sprayed lance to the damaged through hole for repair. Is described.
In Patent Document 3, a manipulator is used to measure the shape of the hole from the carbonization chamber side to obtain shape data, and based on the shape data, the refractory is processed into a shape that enters the hole, and the processed refractory is processed. A method of closing a rupture by inserting an object into the rupture from the carbonization chamber side and spraying the refractory toward the boundary between the refractory and the rupture until it becomes smooth with the wall surface is described.

Japanese Unexamined Patent Publication No. 2017-48273 Japanese Unexamined Patent Publication No. 2014-40502 Japanese Unexamined Patent Publication No. 2008-2004

In the method described in Patent Document 1, when an amorphous refractory falls into the combustion chamber, the gas supply port or the air supply port provided at the bottom of the combustion chamber may be blocked and the function as the combustion chamber may be lost. .. In addition, a method of adhering an amorphous refractory to the outer periphery of a large refractory and fixing a refractory refractory to the amorphous refractory to close the fracture is to match the shape of the fracture. There is a problem that it takes time to mold a refractory adherent combustible plate.

In the method described in Patent Document 2, a special jig must be inserted through a combustion chamber inspection hole having an inner diameter of about 100 mm, and a backing plate must be pressed against the ruptured surface while observing the ruptured portion from the inspection hole. It's a difficult task. Further, this method has a problem that work is required from both sides of the carbonization chamber side and the combustion chamber side.
In the method described in Patent Document 3, it is necessary to accurately measure the shape of the puncture hole and separately mold a refractory material according to the shape, which not only takes time for repair but also requires a dedicated manipulator, which is expensive. There are challenges.

The bricks constituting the furnace wall of the coke oven are silica bricks, and a transformation point at which the coefficient of thermal expansion changes rapidly exists at around 600 ° C. Therefore, when the temperature of the furnace wall is lowered to 600 ° C. or lower, the bricks are liable to crack. In many cases, the furnace wall is repaired by opening the furnace lid of the carbonization chamber, so that the temperature of the furnace wall is inevitably lowered. Therefore, the method of repairing the furnace wall of the coke oven carbonization chamber must be a method with good workability and speed.
Further, if the refractory used for repair falls into the combustion chamber, the gas supply port and the air supply port may be blocked. If the gas supply port or the air supply port is closed, the combustion gas is not supplied to the combustion chamber, and the function as the combustion chamber is impaired. Therefore, the method of repairing the furnace wall of the coke oven carbonization chamber must be a method capable of maintaining the function of the combustion chamber.

The present invention has been made in view of such circumstances. The purpose is to provide.

In order to achieve the above object, the first invention is a method of repairing a breach penetrating a furnace wall separating a carbonization chamber and a combustion chamber of a coke oven.
A blanket-shaped heat insulating material having a maximum operating temperature of 1000 ° C. or higher and 1300 ° C. or lower is held by a heat insulating material holder, and the carbonization chamber is held from a kiln opening of the carbonization chamber or a coal inlet provided at the top of the carbonization chamber. The step of inserting the heat insulating material into the hole using the heat insulating material holder and fitting the heat insulating material into the hole.
A step of inserting a thermal spraying device into the carbonizing chamber from the kiln opening of the carbonizing chamber, and using the thermal spraying device to spray the boundary between the heat insulating material and the hole, and fixing the heat insulating material to the hole.
It is characterized by comprising a step of forming a thermal spraying layer on and around the heat insulating material by using the thermal spraying device to close the rupture.

The second invention is a method of repairing a breach penetrating a furnace wall that separates a carbonization chamber and a combustion chamber of a coke oven.
A columnar heat insulating material in which a blanket-shaped heat insulating material having a maximum operating temperature of 1000 ° C. or more and 1300 ° C. or less is wound in a columnar shape is held by a heat insulating material holder and placed at the kiln opening of the carbonization chamber or the top of the carbonization chamber. A furnace wall that is inserted into the carbonization chamber from a provided coal charging inlet, the columnar heat insulating material is inserted into the hole using the heat insulating material holder, and one end face of the columnar heat insulating material is broken. The process of bringing the combustion chamber facing the wall into contact with the wall of the wood,
A thermal spraying device is inserted into the carbonization chamber from the kiln opening of the carbonization chamber, and the thermal spraying material is injected into the gap between the columnar heat insulating material and the puncture hole using the thermal spraying device to rupture the columnar heat insulating material. And the process of fixing to
It is characterized by comprising a step of forming a thermal spray layer on and around the columnar heat insulating material by using the thermal spraying device to close the rupture.

Normally, when repairing a rupture, the size of the rupture is measured, a refractory or the like is formed according to the shape and size of the rupture, the rupture is closed by this, and then the furnace wall is smoothed by thermal spraying. Implement the conversion. In the case of a large hole, in addition to the time required for forming the refractory, the workability deteriorates when the refractory is inserted into the carbonization chamber by the holder. On the other hand, the blanket-shaped heat insulating material used in the present invention is light even if it is molded large, and the workability is good because the molding can be performed by hand. Further, since the blanket-shaped heat insulating material has flexibility, it fits the puncture without being accurately dimensioned, so that it is not necessary to accurately measure the size of the puncture.

If the refractory is dropped into the combustion chamber when the refractory is inserted, there is a risk of blocking the gas supply port or air supply port at the bottom of the combustion chamber, but the maximum operating temperature is 1300 ° C or less. Since the heat insulating material has the property of shrinking over time under high temperature conditions (about 1350 ° C.) of the combustion chamber, the function of the combustion chamber is not impaired even if it is dropped. Further, taking advantage of the property of shrinking at high temperature, a blanket-shaped heat insulating material is wound in a columnar shape and inserted into a hole, and one end face of the heat insulating material is inserted into a fire wall of a combustion chamber facing the fire wall of the hole. It is possible to provide the heat insulating material at an appropriate position of the hole-breaking portion by abutting against the hole. As a result, the heat insulating material can be easily installed even in the punctured portion at a position away from the kiln opening, and the heat insulating material can be supported by the furnace wall of the ruptured portion and the combustion chamber, so that the risk of the heat insulating material falling can be reduced.
If the maximum operating temperature of the heat insulating material is less than 1000 ° C., the heat insulating material may shrink during the repair of the hole (up to about 8 hours), and a gap may be formed between the heat insulating material and the hole.

In the method for repairing the furnace wall of the coke oven carbonization chamber according to the present invention, a blanket-shaped heat insulating material that is easy to mold and has flexibility is used, so that workability is good, quick and inexpensive, and even large punctures can be dealt with. be able to. Further, since the blanket-shaped heat insulating material used in the present invention has a property of shrinking over time, there is no risk of impairing the function of the combustion chamber.

It is a schematic diagram which showed the arrangement of the carbonization chamber and the combustion chamber in a coke oven. (A) is a plan sectional view of a breach formed in the furnace wall separating the carbonization chamber and the combustion chamber, and (B) is an elevational view of the breach as viewed from the carbonization chamber side. (A) to (C) are image diagrams showing the procedure of the method of repairing the furnace wall of the coke oven carbonization chamber according to the first embodiment of the present invention. It is a schematic diagram which showed the furnace wall region in which the application of the method of repairing a coke oven carbonization chamber furnace wall which concerns on 2nd Embodiment of this invention is effective. (A) to (C) are image diagrams showing the procedure of the repair method of the furnace wall of the coke oven carbonization chamber.

Subsequently, an embodiment embodying the present invention will be described with reference to the attached drawings, and the present invention will be understood. In the present specification and the drawings, components having substantially the same function are designated by the same reference numerals, and duplicate description thereof will be omitted.

The coke oven (not shown) has a configuration in which carbonization chambers for producing coke by carbonizing coking coal and combustion chambers for supplying heat to the carbonization chamber are alternately arranged in the longitudinal direction of the coke oven (not shown). (See FIG. 1). An extruder (not shown) is placed on one side surface along the longitudinal direction of the coke oven, and a guide wheel (not shown) and a fire extinguisher (not shown) are arranged on the other side surface, and each of them travels in the longitudinal direction of the coke oven.
When carbonization coke is generated in the carbonization chamber, the furnace lids attached to both end faces of the carbonization chamber are removed to open the kiln opening 19 (see FIG. 4), and the extrusion ram of the extruder is removed from one of the kiln openings 19. Move to the other kiln opening 19. As a result, the carbonized coke in the carbonization chamber is discharged from the other kiln opening 19. The discharged dry coke is loaded onto the fire engine via the guide vehicle.

As described above, when the coke is extruded, friction occurs between the coke in the carbonization chamber and the furnace wall, and the furnace wall is thinned and worn. As the wall thinning and wear progresses, punctures that penetrate the furnace wall that separate the carbonization chamber and the combustion chamber occur. Images of the rupture holes 11 formed in the furnace wall 10 that separates the carbonization chamber and the combustion chamber are shown in FIGS. 2 (A) and 2 (B).

[Method of repairing the furnace wall of the coke oven carbonization chamber according to the first embodiment]
With reference to FIG. 3, the procedure of the method of repairing the furnace wall of the coke oven carbonization chamber according to the first embodiment of the present invention will be described.

[STEP-1]
A blanket-shaped heat insulating material is formed according to the shape of the hole.
The maximum operating temperature of the blanket-shaped heat insulating material is 1000 ° C. or higher and 1300 ° C. or lower.
The blanket-shaped heat insulating material includes a blanket made of _{ceramic fibers containing alumina (Al 2} O ₃ ) and silica (SiO ₂ ) as main components (for example, Isowool 1000 blanket (trade name) manufactured by Isolite Industry Co., Ltd.). A blanket made of alkaline earth silicate (SiO _2- CaO-MgO) (for example, a super wool blanket (trade name) manufactured by Shin Nihon Thermal Ceramics Co., Ltd.) can be used.

[STEP-2]
The molded blanket-shaped heat insulating material 12 is held by the heat insulating material holder 14 and inserted into the carbonization chamber from the kiln opening 19 of the carbonization chamber or the coal inlet 18 provided at the top of the carbonization chamber, and the heat insulating material holder 14 is used to fit the heat insulating material 12 into the hole 11 (see FIGS. 3 (A) and 4).

[STEP-3]
A thermal spraying device 15 is inserted into the carbonization chamber from the kiln opening 19 of the carbonization chamber, and the boundary between the heat insulating material 12 and the hole 11 is sprayed using the thermal spraying device 15 to fix the heat insulating material 12 to the hole 11 and then heat-insulated. The material holder 14 is collected (see FIG. 3B).
A mixture of silica and alumina is used as the thermal spray material 16 used for thermal spraying. The mixing ratio of silica and alumina varies, but to give an example, silica: 85 to 97% by mass and alumina: 2 to 10% by mass. The substances contained other than silica and alumina are calcium oxide: less than 2% by mass and titanium oxide: less than 1% by mass.

[STEP-4]
Using the thermal spraying device 15, a thermal spraying layer 17 is formed on and around the heat insulating material 12 until it becomes smooth with the wall surface to close the hole 11 (see FIG. 3C).

[Method of repairing the furnace wall of the coke oven carbonization chamber according to the second embodiment]
With reference to FIG. 5, the procedure of the method of repairing the furnace wall of the coke oven carbonization chamber according to the second embodiment of the present invention will be described.
[STEP-1]
A blanket-shaped heat insulating material 12 having a maximum operating temperature of 1000 ° C. or higher and 1300 ° C. or lower is wound into a columnar shape having a diameter slightly smaller than that of the hole 11 to form the columnar heat insulating material 13. Next, the columnar heat insulating material 13 is held by the heat insulating material holder 14 and inserted into the carbonization chamber from the kiln opening 19 of the carbonization chamber or the coal charging inlet 18 provided at the top of the carbonization chamber, and the heat insulating material holder 14 is inserted. The columnar heat insulating material 13 is inserted into the hole 11 using the above, and one end surface of the columnar heat insulating material 13 is brought into contact with the fire wall 10a of the combustion chamber facing the fire wall 10 having the hole (FIG. 5). See (A)).
The length (height) of the columnar heat insulating material 13 is longer than the width of the combustion chamber, and the minimum thickness (for example, 10 mm) of the required sprayed layer is subtracted from the sum of the width of the combustion chamber and the thickness of the furnace wall 10. The length shall be less than or equal to the length.

[STEP-2]
The thermal spraying device 15 is inserted into the carbonization chamber from the kiln opening 19 of the carbonization chamber, and the thermal spraying material 16 is injected into the gap between the columnar heat insulating material 13 and the rupture hole 11 using the thermal spraying device 15 to break the columnar heat insulating material 13. After fixing to the hole 11, the heat insulating material holder 14 is collected (see FIG. 5 (B)).

[STEP-3]
Using the thermal spraying device 15, a thermal spraying layer 17 is formed on and around the columnar heat insulating material 13 until it becomes smooth with the wall surface to close the hole 11 (see FIG. 5C).
Since the columnar heat insulating material 13 having the combustion chamber protruding from the side is burnt down over time, the gas supply port and the air supply port at the bottom of the combustion chamber are not blocked.

In the method for repairing the furnace wall of the coke oven carbonization chamber according to the second embodiment of the present invention, since the columnar heat insulating material 13 can be easily provided at an appropriate position of the puncture hole 11, it was inserted from the kiln opening 19. It is effective for repairing the region from the upper stage to the middle stage (the region surrounded by the alternate long and short dash line in FIG. 4) in the central portion of the carbonization chamber where the heat insulating material holder 14 does not reach the puncture hole 11.

Although the embodiments of the present invention have been described above, the present invention is not limited to the configuration described in the above-described embodiments, and is considered within the scope of the matters described in the claims. It also includes other embodiments and variations thereof.

10, 10a: Furnace wall, 11: Hole, 12: Insulation material, 13: Columnar insulation material, 14: Insulation material holder, 15: Thermal spraying device, 16: Thermal spraying material, 17: Thermal spray layer, 18: Coal coating Entrance, 19: Kiln entrance

Claims (2)

It is a method of repairing a breach that penetrates the furnace wall that separates the carbonization chamber and the combustion chamber of a coke oven.
A blanket-shaped heat insulating material having a maximum operating temperature of 1000 ° C. or higher and 1300 ° C. or lower is held by a heat insulating material holder, and the carbonization chamber is held from a kiln opening of the carbonization chamber or a coal inlet provided at the top of the carbonization chamber. The step of inserting the heat insulating material into the hole using the heat insulating material holder and fitting the heat insulating material into the hole.
A step of inserting a thermal spraying device into the carbonizing chamber from the kiln opening of the carbonizing chamber, and using the thermal spraying device to spray the boundary between the heat insulating material and the hole, and fixing the heat insulating material to the hole.
A method for repairing a furnace wall of a coke oven carbonization chamber, which comprises a step of forming a thermal spray layer on and around the heat insulating material using the thermal spraying device to close the rupture. It is a method of repairing a breach that penetrates the furnace wall that separates the carbonization chamber and the combustion chamber of a coke oven.
A columnar heat insulating material in which a blanket-shaped heat insulating material having a maximum operating temperature of 1000 ° C. or more and 1300 ° C. or less is wound in a columnar shape is held by a heat insulating material holder and placed at the kiln opening of the carbonization chamber or the top of the carbonization chamber. A furnace wall that is inserted into the carbonization chamber from a provided coal charging inlet, the columnar heat insulating material is inserted into the hole using the heat insulating material holder, and one end face of the columnar heat insulating material is broken. The process of bringing the combustion chamber facing the wall into contact with the wall of the wood,
A thermal spraying device is inserted into the carbonization chamber from the kiln opening of the carbonization chamber, and the thermal spraying material is injected into the gap between the columnar heat insulating material and the puncture hole using the thermal spraying device to rupture the columnar heat insulating material. And the process of fixing to
A method for repairing a furnace wall of a coke oven carbonization chamber, which comprises a step of forming a thermal spray layer on and around the columnar heat insulating material by using the thermal spraying apparatus to close the rupture.

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