JP7323741B2 - Coke oven carbonization chamber wall repair method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for repairing a wall of a coking chamber of a coke oven, and more particularly to a method of repairing a hole penetrating the wall separating a coking chamber from a combustion chamber.

In a chamber-type coke oven, coke chambers and combustion chambers are alternately arranged, and the coke chambers and combustion chambers are separated by brick walls (furnace walls). Coal is charged into the coking chamber, and the combustion gas is burned in the combustion chamber to transfer heat to the coking chamber through the furnace wall, and carbonize the coal to produce coke.
The produced coke is extruded from the coke chamber by an extruder. During coke extrusion, friction occurs between the coke in the coke chamber and the oven wall, resulting in wall thickness reduction and wear of the oven wall. As the thickness and wear of the furnace wall progresses, a rupture occurs through the furnace wall that separates the coking chamber from the combustion chamber. Coal can not be charged into the coking chamber where the rupture has occurred, and it cannot be operated, so repair is required.

As a method for repairing a hole that penetrates the furnace wall, there is a method of replacing the bricks in the holed part, closing the hole with a refractory material, etc., and spraying it over the hole to repair it.
For example, in Patent Document 1, a monolithic refractory is attached to the fractured surface of the hole by a refractory holder inserted from a charging port to form a monolithic refractory layer, and a thermal spraying device is inserted into the carbonization chamber. A method of forming a thermal spray layer on a monolithic refractory layer formed in a hole to close the hole is described. If the opening of the hole is large, a monolithic refractory layer is formed on the fracture surface of the hole, and the refractory-covered combustible plate inserted from the charging port is pressed against the monolithic refractory layer of the hole to temporarily After fixing, a thermal spray layer is formed on the surface of the refractory-adhered combustible plate and the surrounding furnace wall surface to close the hole.

In Patent Document 2, a heat-resistant backing plate held by a plate holding jig is inserted from an inspection opening in a combustion chamber, the heat-resistant backing plate is pressed against the damaged through-hole from one side of the damaged through-hole, and the damaged through-hole is closed. and placing a thermal spraying lance for spraying the thermal spraying material on the other side of the damaged through hole, and spraying the thermal spraying material from the thermal spraying nozzle of the thermal spraying lance to the damaged through hole to repair the damaged through hole. is described.
In Patent Document 3, using a manipulator, the shape of the hole is measured from the side of the coking chamber to obtain shape data, the refractory is processed into a shape that fits into the hole based on the shape data, and the processed refractory It describes a method of closing a hole by inserting an object into the hole from the coking chamber side and thermally spraying the refractory and the boundary between the refractory and the hole until the wall surface is smooth.

JP 2017-48273 A JP 2014-40502 A Japanese Patent Application Laid-Open No. 2008-202004

In the method described in Patent Document 1, when the monolithic refractory falls into the combustion chamber, the gas supply port or the air supply port provided at the bottom of the combustion chamber is clogged, and the function as the combustion chamber may be lost. . In addition, in the method of attaching a monolithic refractory to the outer periphery of a large hole and fixing the refractory-attached combustible plate to the monolithic refractory to close the hole, However, there is a problem that it takes a long time to form the combustible plate adhered to the refractory.

In the method described in Patent Document 2, a special jig must be inserted from a combustion chamber inspection hole with an inner diameter of about 100 mm, and a patch must be pressed against the hole surface while observing the hole through the inspection hole. It is a difficult task. In addition, this method has a problem that it is necessary to perform work from both the coking 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 hole and mold the refractory separately according to the shape, which not only takes time to repair, but also requires an expensive dedicated manipulator. I have a problem.

The bricks constituting the oven wall of the coke oven are silica bricks, and have a transformation point near 600° C. where the coefficient of thermal expansion abruptly changes. Therefore, when the temperature of the furnace wall drops below 600°C, the bricks tend to crack. Since the furnace wall is often repaired with the lid of the coking chamber open, the temperature of the furnace wall is inevitably lowered. Therefore, the method for repairing the wall of the coke oven coking chamber must be a quick method with good workability.
Moreover, if the refractory used for repairing falls into the combustion chamber, the gas supply port and the air supply port may be clogged. If the gas supply port or the air supply port is clogged, combustion gas will not be supplied to the combustion chamber, and the function of the combustion chamber will be impaired. Therefore, the method for repairing the wall of the coke oven coking 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, and is a method for repairing a coke oven wall of a coking chamber that is free from the risk of impairing the function of the combustion chamber, has good workability, is quick and inexpensive, and can deal with large holes. intended to provide

In order to achieve the above object, the first invention is a method for repairing a hole penetrating a furnace wall separating a coking chamber and a combustion chamber of a coke oven,
A blanket-shaped heat insulating material having a maximum use temperature of 1000° C. or more and 1300° C. or less is held by a heat insulating material holder, and the heat is supplied from the kiln mouth of the carbonization chamber or a coal charging port provided at the top of the carbonization chamber to the carbonization chamber. and inserting the insulating material into the hole using the insulating material holder;
a step of inserting a thermal spraying device into the carbonization chamber from the kiln mouth of the carbonization chamber, and using the thermal spraying device to thermally spray the boundary between the heat insulating material and the hole to fix the heat insulating material in the hole;
and a step of forming a thermal spray layer on and around the heat insulating material using the thermal spray apparatus to close the hole.

A second invention is a method for repairing a hole penetrating a furnace wall separating a coking chamber and a combustion chamber of a coke oven,
A columnar heat insulating material obtained by winding a cylindrical heat insulating material with a maximum use temperature of 1000° C. or more and 1300° C. or less is held by a heat insulating material holder and placed at the kiln mouth of the carbonization chamber or at the top of the carbonization chamber. The cylindrical heat insulating material is inserted into the coking chamber from the provided coal charging port, and the cylindrical heat insulating material is inserted into the hole using the heat insulating material holder so that one end surface of the cylindrical heat insulating material is attached to the holed furnace wall. A step of contacting the furnace wall of the combustion chamber facing the
A thermal spraying device is inserted into the carbonization chamber from the kiln mouth of the carbonization chamber, and the thermal spraying device is used to inject the thermal spraying material into the gap between the cylindrical heat insulating material and the broken hole, thereby removing the cylindrical heat insulating material from the broken hole. a step of fixing to
forming a thermal spray layer on and around the cylindrical heat insulating material by using the thermal spray apparatus to close the hole.

Normally, when repairing a hole, the dimensions of the hole are measured, and a refractory material or the like is molded according to the shape and size of the hole to close the hole, and then the furnace wall is smoothed by thermal spraying. implementation of In the case of a large hole, it takes time to form the refractory, and in addition, when inserting the formed refractory into the carbonization chamber with a holder, it becomes heavy and workability deteriorates. On the other hand, the blanket-like heat insulating material used in the present invention is light even when it is formed in a large size, and is easy to work because it can be formed by hand. Additionally, the blanket insulation is flexible enough to fit into the perforation without having to be precisely dimensioned, eliminating the need to accurately measure the perforation.

If the refractory is dropped into the combustion chamber when inserting the refractory, there is a risk of clogging the gas supply port or air supply port at the bottom of the combustion chamber. The heat insulating material has the characteristic of shrinking over time under high temperature conditions (about 1350° C.) in the combustion chamber, so even if it falls, the function of the combustion chamber will not be impaired. In addition, taking advantage of the property of shrinking at high temperature, a blanket-like heat insulating material is rolled into a cylindrical shape and inserted into the hole, and one end face of the heat insulating material is attached to the furnace wall of the combustion chamber side facing the holed furnace wall. , so that the heat insulating material can be provided at an appropriate position of the hole. As a result, the heat insulating material can be easily installed even in the perforated part located away from the kiln mouth, and the risk of the heat insulating material falling can be reduced by supporting the heat insulating material between the perforated part and the furnace wall between the combustion chamber.
If the maximum operating temperature of the heat insulating material is less than 1000° C., there is a risk that the heat insulating material will shrink while the hole is being repaired (up to about 8 hours), creating a gap between the heat insulating material and the hole.

In the method for repairing the wall of the coke oven coking chamber according to the present invention, a blanket-shaped heat insulating material that is easy to mold and has flexibility is used, so workability is good, it is quick and inexpensive, and it can handle large holes. be able to. Moreover, since the blanket-like heat insulating material used in the present invention has a characteristic of shrinking over time, there is no risk of impairing the function of the combustion chamber.

FIG. 2 is a schematic diagram showing the arrangement of a coking chamber and a combustion chamber in a coke oven; (A) is a plan cross-sectional view of a hole formed in the furnace wall separating the coking chamber and the combustion chamber, and (B) is an elevational view of the same hole seen from the side of the coking chamber. 1A to 1C are image diagrams showing procedures of a method for repairing a wall of a coke oven coking chamber according to the first embodiment of the present invention; FIG. FIG. 7 is a schematic diagram showing a furnace wall region to which the coke oven coking chamber furnace wall repair method according to the second embodiment of the present invention is effective. (A) to (C) are image diagrams showing procedures of a method for repairing the wall of the coke oven coking chamber.

Next, an embodiment embodying the present invention will be described with reference to the attached drawings for understanding of the present invention. In the present specification and drawings, constituent elements having substantially the same functions are denoted by the same reference numerals, thereby omitting redundant description.

A coke oven (not shown) has a structure in which a carbonization chamber for producing coke by carbonizing coking coal and a combustion chamber for supplying heat to the carbonization chamber are alternately arranged in the longitudinal direction of the coke oven ( See Figure 1). An extruder (not shown) is arranged on one side along the longitudinal direction of the coke oven, and a guide car (not shown) and a fire extinguishing car (not shown) are arranged on the other side, and run in the longitudinal direction of the coke oven.
When dry distillation coke is generated in the coking chamber, the furnace lids attached to both end faces of the coking chamber are removed to open the kiln mouth 19 (see FIG. 4), and the extrusion ram of the extruder is pushed out from one kiln mouth 19. It is moved to the kiln mouth 19 of the other side. As a result, dry-distilled coke in the carbonization chamber is discharged from the other kiln port 19 . The discharged dry-distilled coke is loaded onto a fire extinguishing vehicle via a guide vehicle.

As described above, during coke extrusion, friction occurs between the coke in the coke chamber and the furnace wall, and the wall is thinned and worn. As the thickness and wear of the furnace wall progresses, a rupture occurs through the furnace wall that separates the coking chamber from the combustion chamber. Images of the perforations 11 formed in the furnace wall 10 separating the coking chamber and the combustion chamber are shown in FIGS. 2(A) and 2(B).

[Method for Repairing Wall of Coke Oven Coking Chamber According to First Embodiment]
The procedure of the method for repairing the wall of the coke oven coking chamber according to the first embodiment of the present invention will be described with reference to FIG.

[STEP-1]
A blanket-like insulating material is formed according to the shape of the perforation.
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, Super Wool Blanket (trade name) manufactured by Shin-Nippon Thermal Ceramics Co., Ltd.) can be used.

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

[STEP-3]
A thermal spraying device 15 is inserted into the carbonization chamber from the kiln mouth 19 of the carbonization chamber, and the thermal spraying device 15 is used to thermally spray the boundary between the heat insulating material 12 and the hole 11 to fix the heat insulating material 12 to the hole 11, and then heat insulation. The material holder 14 is recovered (see FIG. 3(B)).
A mixture of silica and alumina is used for the thermal spraying material 16 used for thermal spraying. Although there are various mixing ratios of silica and alumina, one example is silica: 85 to 97% by mass and alumina: 2 to 10% by mass. Contained substances other than silica and alumina are less than 2% by mass of calcium oxide and less than 1% by mass of titanium oxide.

[STEP-4]
Using a thermal spraying device 15, a thermal spray 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. 3(C)).

[Method for Repairing Coke Oven Coking Chamber Furnace Wall According to Second Embodiment]
The procedure of the method for repairing the wall of the coke oven coking chamber according to the second embodiment of the present invention will be described with reference to FIG.
[STEP-1]
A cylindrical heat insulating material 13 is formed by winding a blanket-like heat insulating material 12 having a maximum use temperature of 1000° C. or more and 1300° C. or less in a cylindrical shape having a slightly smaller diameter than the hole 11 . Next, the cylindrical heat insulating material 13 is held by the heat insulating material holder 14 and is inserted into the coking chamber from the kiln mouth 19 of the coking chamber or the coal charging port 18 provided at the top of the coking chamber. is used to insert the cylindrical heat insulating material 13 into the hole 11, and one end surface of the cylindrical heat insulating material 13 is brought into contact with the furnace wall 10a of the combustion chamber facing the holed furnace wall 10 (Fig. 5 (A)).
The length (height) of the cylindrical heat insulating material 13 is longer than the width of the combustion chamber, and the required minimum thickness of the thermal spray layer (for example, 10 mm) is subtracted from the sum of the width of the combustion chamber and the thickness of the furnace wall 10. length or less.

[STEP-2]
A thermal spraying device 15 is inserted into the carbonization chamber from the kiln port 19 of the carbonization chamber, and the thermal spraying device 15 is used to inject the thermal spraying material 16 into the gap between the cylindrical heat insulating material 13 and the hole 11 to break the cylindrical heat insulating material 13. After fixing to the hole 11, the heat insulator holder 14 is recovered (see FIG. 5(B)).

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

In the method for repairing the wall of the coke oven coking chamber according to the second embodiment of the present invention, the cylindrical heat insulating material 13 can be easily provided at the appropriate position of the broken hole 11, so it is inserted from the kiln mouth 19. It is effective in repairing the area from the upper stage to the middle stage of the central portion of the coking chamber where the heat insulating material holder 14 does not reach the hole 11 (the area surrounded by the chain double-dashed line in FIG. 4).

Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations described in the above embodiments, and can be considered within the scope of the matters described in the claims. It also includes other embodiments and modifications.

10, 10a: furnace wall, 11: hole, 12: heat insulating material, 13: cylindrical heat insulating material, 14: heat insulating material holder, 15: thermal spraying device, 16: thermal spraying material, 17: thermal spraying layer, 18: coal packaging Entrance, 19: Kiln mouth

Claims (2)

A method for repairing a hole penetrating a furnace wall separating a coking chamber and a combustion chamber of a coke oven, comprising:
A blanket-shaped heat insulating material having a maximum use temperature of 1000° C. or more and 1300° C. or less is held by a heat insulating material holder, and the heat is supplied from the kiln mouth of the carbonization chamber or a coal charging port provided at the top of the carbonization chamber to the carbonization chamber. and inserting the insulating material into the hole using the insulating material holder;
a step of inserting a thermal spraying device into the carbonization chamber from the kiln mouth of the carbonization chamber, and using the thermal spraying device to thermally spray the boundary between the heat insulating material and the hole to fix the heat insulating material in the hole;
A method for repairing a coking chamber wall of a coke oven, comprising the step of forming a thermal spray layer on and around the heat insulating material using the thermal spraying apparatus to close the hole. A method for repairing a hole penetrating a furnace wall separating a coking chamber and a combustion chamber of a coke oven, comprising:
A columnar heat insulating material obtained by winding a cylindrical heat insulating material with a maximum use temperature of 1000° C. or more and 1300° C. or less is held by a heat insulating material holder and placed at the kiln mouth of the carbonization chamber or at the top of the carbonization chamber. The cylindrical heat insulating material is inserted into the coking chamber from the provided coal charging port, and the cylindrical heat insulating material is inserted into the hole using the heat insulating material holder so that one end surface of the cylindrical heat insulating material is attached to the holed furnace wall. A step of contacting the furnace wall of the combustion chamber facing the
A thermal spraying device is inserted into the carbonization chamber from the kiln mouth of the carbonization chamber, and the thermal spraying device is used to inject the thermal spraying material into the gap between the cylindrical heat insulating material and the broken hole, thereby removing the cylindrical heat insulating material from the broken hole. a step of fixing to
A method for repairing a wall of a coke oven coking chamber, comprising the step of forming a thermal spray layer on and around the cylindrical heat insulating material using the thermal spray apparatus to close the hole.

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