JP4917188B2 - Coke oven gas way repair method and gas way repair device - Google Patents

Description

The present invention relates to a repair method and a repair device in a gas passage for a coke oven.
This application claims priority in 2010/4/6 based on Japanese Patent Application No. 2010-087954 for which it applied to Japan, and uses the content for it here.

  As a coke oven, one in which 60 to 110 furnaces are gathered to form one furnace group is known. Each furnace consists of a pair of carbonization chambers and combustion chambers arranged in a plurality of rows alternately in the furnace width direction. The combustion chamber is adjacent to the carbonization chamber via a furnace wall made of brick, and is partitioned into 20 to 30 small combustion chambers (flues) in the furnace length direction. The bottom of each small combustion chamber leads to a preheating heat storage chamber. Fuel gas whose flow rate is adjusted by the fuel gas cock and air whose flow rate is adjusted by the air cock are used for each preheating through the gas path from the under jet pipe. It is supplied to the heat storage chamber. Thereafter, the fuel gas and air sent to each small combustion chamber are combusted, whereby the carbonization chambers on both sides in the furnace width direction of the combustion chamber are heated through the furnace wall. Thereby, dry distillation of the coal in a carbonization chamber is performed.

And the exhaust gas produced | generated in each small combustion chamber is heat-recovered while it is stored in the heat-recovery heat storage chamber. Thereafter, the exhaust gas is discharged to a horizontal flue (sole flue) provided at the bottom of the furnace and collected in the collecting flue. The exhaust gas is distributed to the two flues provided at two locations, the coke side (CS) and the pusher side (PS), and then discharged from the chimney to the atmosphere.
In general, the preheating storage chamber is called “standing side”, and the heat recovery storage chamber is called “pulling side”, and the standing side and the drawing side have a combustion cycle (for example, a control cycle of 20 to 30 minutes). It is switched alternately every time (for example, refer to Patent Document 1).

  As the fuel gas supplied to the combustion chamber, a mixed gas (MG) in which BFG (Blast Furnace Gas) and COG (Coke Oven Gas) are usually used is used. These fuel gases are supplied from a basement of the coke oven through a gas passage to a combustion chamber standing vertically to the ground. Thus, the fuel gas supplied by the underjet method is combusted in the combustion chamber, thereby maintaining each combustion chamber at a predetermined temperature.

In general, a coke oven is a structure made of refractory bricks, and a gas passage is also made of refractory bricks like a coke oven.
FIG. 4 is a schematic diagram of the coke oven 200. Each of the carbonization chambers 105 is disposed adjacent to the combustion chamber 103 and is charged with pulverized coal (coarse coal) 106 supplied from above.
When coke is produced in the coke oven 200, first, the fuel gas 101 is supplied from the basement (not shown) provided below the coke oven 200 to the combustion chamber 103 through the gas passage 102. Next, the fuel gas 101 is combusted 104 in the combustion chamber 103, and the supply amount of the fuel gas 101 is managed so that the inside of the combustion chamber 103 is maintained at a temperature of about 1200 ° C. By maintaining the combustion chamber 103 at this temperature, the pulverized coal 106 is dry-distilled to form coke. Thereafter, the coke is extruded out of the furnace from the carbonization chamber 5 by an unillustrated extruder.

FIG. 5 is a schematic cross-sectional view of the gas passage 102. A fuel gas (not shown) is supplied to the gas passage 102 through the under jet pipe 107. The gas passage 102 is constructed of bricks 108 (refractory bricks). The inner peripheral surface 102 a of the gas passage 102 is exposed to a high temperature of 1000 ° C. or higher when the fuel gas 101 is burned. For this reason, a damaged portion 110 such as a crack or a joint breakage occurs in the brick 108 exposed on the inner peripheral surface 102a due to aging or long-time combustion. When the damaged portion 110 is generated in the brick 108 in this manner, the fuel gas 101 leaks from the damaged portion 110, so that the temperature of the flue does not rise (the temperature in the gas passage 102 is not sufficiently raised).
As a result, coking of coal in the carbonization chamber 105 becomes insufficient, and when the coke is discharged (extruded) from the coke oven 200, the coke may be clogged into the coke oven 200 and not extruded. For this reason, the operation of the coke oven 200 may be adversely affected.

Therefore, it is necessary to periodically inspect the inner peripheral surface 102a of the gas passage 103 and partially repair the damaged portion 110.
Conventionally, as a repair method of a damaged part such as a crack or joint breakage of a structure made of a refractory brick, after confirming the damaged part by visual observation or a camera or a fiber scope, for example, mortar is sprayed on the part, dry seal, etc. Ordinarily, a repair agent is applied (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 11-35944 Japanese Unexamined Patent Publication No. 7-278554

  However, since the gas passage 102 is a narrow space, it is difficult to perform repair work by the above repair method. Further, since the repair agent cannot be sprayed or applied to the damaged part with a high pressing force, the repair agent does not penetrate deeply into the damaged part. For this reason, there existed a problem that the repair effect of a damaged part became inadequate. As for the method for repairing the coke oven in the gas passage, no actual method has been proposed so far.

  The present invention has been made in view of such a situation, and it is easy to repair a damaged portion such as a brick crack or a joint cut in a gas passage, and allows the mortar to penetrate deeply into the damaged portion. An object of the present invention is to provide a method and apparatus for repairing a coke oven gas passage.

The present invention employs the following means in order to solve the above problems and achieve the object.
(1) A gas passage repair method according to an aspect of the present invention is a method of repairing a damaged portion of a gas passage of a coke oven, maintaining a predetermined gap with respect to the inner peripheral surface of the gas passage, and A first pipe is inserted and disposed so that the upper end is located in the gas passage, and the second pipe covers the first pipe with a predetermined interval from the periphery thereof and has a male screw part at the tip, and the second pipe Inserting the second pipe of the sealing portion provided with a ring-shaped plate member that closes between the inner peripheral surface at the lower end of the gas pipe and the outer peripheral surface of the first pipe into the lower end of the gas passage; The male screw portion of the second pipe and the female screw portion provided at the lower end of the inner peripheral surface of the gas passage are screwed together to seal between the lower end of the gas passage and the lower portion of the first pipe. pressure mortar into the gap toward the vertically lower side to the upper side; and a step of stopping Step of the; and recovering the first rides over the upper end of the pipe the mortar that has entered into the first pipe; having.

( 2 ) A gas passage repair device according to an aspect of the present invention is a device for repairing a damaged portion of a gas passage of a coke oven, maintaining a predetermined gap with respect to the inner peripheral surface of the gas passage, and A first pipe disposed so that an upper end is located in the gas passage; a sealing portion that seals between a lower portion of the first pipe and a lower end of the gas passage; penetrating through the sealing portion A press-fit portion communicating with the gap; a mortar supply portion for press-fitting mortar into the gap through the press-fit portion; the remaining mortar provided at the lower portion of the first pipe and overcoming the upper end of the first pipe a recovery unit for recovering; have a, the sealing portion, wherein the first pipe together cover at a predetermined distance from the periphery thereof, screwed into the female thread portion of the lower end of the inner peripheral surface of the gas passage a second pipe having a male screw portion that; put on the lower end of the second pipe To have a; close a ring-shaped plate member between the inner peripheral surface and the outer peripheral surface of the first pipe.

( 3 ) In the gas passage repair apparatus according to ( 2 ), the inner diameter of the gas passage may be equal to the outer diameter of the two pipes.

  According to the gas passage repair method according to the above (1), pressure is applied to the mortar by press-fitting the mortar into the gap from below to above the gas passage. For this reason, the mortar comes into contact with a damaged part such as a brick crack or joint breakage while receiving a high pressing force. Therefore, the mortar can be penetrated deep into the damaged portion, and a high repair effect can be obtained. In addition, since the mortar is pressed into the gap with the upper end of the first pipe positioned in the gas passage, the damaged portion is repaired by the mortar up to the height of the upper end of the first pipe. Therefore, the repair range in the gas passage can be easily set by adjusting the upper end position of the first pipe.

Moreover, according to the repair method in gas passage which concerns on said ( 1 ), the leakage of the mortar from between the outer peripheral surface of a 1st pipe and the inner peripheral surface of a gas passage is prevented. For this reason, the repair work in the gas passage can be easily performed.

Further, according to the gas passage repair device according to the above ( 2 ), by pressing the mortar into the gap, the mortar is pushed up from the lower side to the upper side of the gas passage with pressure applied. For this reason, the mortar can be penetrated deep into the damaged part of the brick, and a high repair effect can be obtained. Moreover, the upper end position of the repair range in the gas passage can be easily set by adjusting the upper end position of the first pipe.

Further, according to the gas passage repair device according to ( 2 ) above, the space between the lower portion of the first pipe and the lower end of the gas passage is firmly sealed. For this reason, leakage of mortar from the sealing portion can be prevented.

Further, according to the gas canal repair apparatus according to the above (3), the second pipe by being screwed to the lower end of the road gas, close contact and the outer peripheral surface of the inner peripheral surface and the second pipe gas canal. For this reason, leakage of mortar from the sealing portion can be effectively prevented.

It is a longitudinal cross-sectional view of the gas passage repair apparatus which concerns on one Embodiment of this invention. It is a top view at the time of seeing the same gas way repair apparatus from the upper direction. It is a longitudinal cross-sectional view which shows the repair method of a gas path using the same gas path repair apparatus. It is a graph which shows the state of the flue temperature in a gas path before and behind repair of a gas path. It is a longitudinal cross-sectional schematic diagram of the coke oven which burns the fuel gas supplied to the combustion chamber through the gas path, and carbonizes the coal of a carbonization chamber. It is a cross-sectional perspective view which shows the internal peripheral surface of the gas path which the damaged part generate | occur | produced.

  Hereinafter, a gas passage repair device 30 according to an embodiment of the present invention and a gas passage repair method using the gas passage repair device 30 will be described with reference to the drawings. In the following drawings, the scale is appropriately changed to make each member a recognizable size.

FIG. 1A is a longitudinal sectional view showing the gas passage repair device 30, and FIG. 1B is a plan view of the gas passage repair device 30 as viewed from above.
As shown in FIGS. 1A and 1B, the gas passage repair device 30 is schematically configured from a first pipe 11 and a sealing portion 15.
Outer diameter _{D 11} of the first pipe 11 is smaller than the inner diameter _{D 2} of the gas path 2 which will be described later. A recovery unit 23 capable of recovering mortar is provided below the first pipe 11.

The sealing part 15 consists of the 2nd pipe 12 and the baseplate 13, and seals between the lower part of the 1st pipe 11, and the lower end 2b of the gas path 2 mentioned later.
The 2nd pipe 12 is arrange | positioned so that the circumference | surroundings (outer peripheral surface 11b) of the 1st pipe 11 may be covered at predetermined intervals. Thereby, a gap 12 c is generated between the inner peripheral surface 12 b ₂ of the second pipe 12 and the outer peripheral surface 11 b of the first pipe 11. The inner diameter _{D 12} of the second pipe 12 is larger than the outer diameter _{D 11} of the first pipe 11, as shown in FIG. 1B in plan view, arranged to the second pipe 12 and the first pipe 11 is concentrically Has been. The outer diameter _{D 13} of the second pipe 12 is preferably equal to the inner diameter _{D 2} of the gas path 2 which will be described later.

The second pipe 12, engagement portion so as to surround the outer peripheral surface 12b ₁ (male screw portion 15a) is provided. Male screw portion 15a is screwed to the lower end 2b of the gas passage 2 which will be described later. A press-fit portion 14 for press-fitting mortar is provided at the lower portion of the second pipe 12 so as to penetrate the bottom plate 13 and communicate with the gap 12c. In addition, a mortar supply unit 19 capable of press-fitting mortar into the gap 12 c via the press-fit part 14 is provided at the lower end of the press-fit part 14.
A stopper 16 and a handle 17 are provided on the outer peripheral surface 12 b ₁ of the second pipe 12. The stopper 16 is made of, for example, a ring-shaped plate material, and is provided below the male screw portion 15a. The shape of the handle 17 is not limited as long as the handle 17 is provided below the stopper 16 and can rotate around the second pipe 12.
The bottom plate 13 is made of, for example, a ring-shaped plate material, and is provided so as to close the inner peripheral surface 12b ₂ and the outer peripheral surface 11b of the first pipe 11 at the lower end 12a ₂ of the second pipe 12.

FIG. 2 is a schematic cross-sectional view showing a method for repairing the gas passage 2 of the coke oven 50 using the in-gas passage repair device 30 shown in FIGS. 1A and 1B. Hereinafter, an example of a method for repairing the gas passage 2 will be described with reference to FIG.
First, an under jet pipe (not shown) fixed to the lower part of the gas passage 2 is removed. A hearth bed 18 is provided at the lower part of the gas passage 2, and the under jet pipe is screwed to the lower end 2 b of the gas passage 2 by a female screw portion 15 b.
Then, the upper end 12a ₁ of the upper end 11a and the second pipe 12 of the first pipe 11 of the gas canal repair device 30 is inserted from below into the gas path 2. Next, the male screw portion 15 a of the second pipe 12 is screwed into the female screw portion 15 b, and the second pipe 12 is fixed to the lower end 2 b of the gas passage 2. At this time, by operating the handle 17, the male screw portion 15a and the female screw portion 15b can be easily screwed together. The second pipe 12 is inserted into the gas passage 2 until the stopper 16 comes into contact with the lower surface 18a of the hearth plate 18 by screwing the male screw portion 15a and the female screw portion 15b.

In addition, it is desirable that the female screw portion 15b is provided on the inner peripheral surface 18b of the hearth plate 18 from the viewpoint of ease of fixing the second pipe 12 and the gas passage 2, but the second pipe 2 As long as the outer peripheral surface 12b and the inner peripheral surface 2a of the gas passage 2 can be in close contact with each other, the female screw portion 15b may not be provided on the inner peripheral surface 18b. For example such a case, for example, an elastic body made of rubber or plastic that is brought into close contact with the inner peripheral surface 18b is provided on the outer peripheral surface 12b ₁ of the second pipe 12, and a second pipe 12 and the hearth plate 18 Fix it.
By fixing the second pipe 12 to the gas passage 2 in this way, the first pipe 11 is inserted and arranged in the gas passage 2. Thereby, the 1st pipe 11 is arrange | positioned so that the outer peripheral surface 11b may maintain the predetermined clearance gap 11c between the internal peripheral surfaces 2a of the gas path 2. FIG. Further, the upper end 11 a of the first pipe 11 is arranged so as to be located in the gas passage 2. The upper end 12a ₁ of the second pipe 12 is arranged so as to be positioned for example within the hearth plate 18.

Next, the mortar 20 is press-fitted from the vertical direction downward to the upper side from the mortar supply part 19 of the press-fitting part 14 using a mortar press-fitting machine (not shown). As a result, the mortar 20 has a gap 12c between the outer peripheral surface 11b of the first pipe 11 and the inner peripheral surface 12b ₂ of the second pipe 12, and the outer peripheral surface 11b of the first pipe 11 and the inner peripheral surface 2a of the gas passage 2. Are sequentially pushed up to the gap 11c.
Thus, pressure is applied to the mortar 20 by press-fitting the mortar 20 into the gap 11c from below to above. For this reason, the mortar 20 contacts the damaged portion 10 such as a crack or a joint breakage of the brick 8 of the coke oven 50 with a high pressing force. As a result, the mortar 20 penetrates 21 to the back of the damaged portion 10.

  As the mortar 20 used in the present embodiment, a known mortar can be used. The amount of water in the mortar 20 may be adjusted as appropriate so as to maintain fluidity and pumpability to penetrate the damaged portion 10 when the mortar 20 is press-fitted into the gap 11c. In particular, when the damaged portion 10 is large, it is preferable to adjust the water content of the mortar 20 as necessary in order to prevent the mortar 20 from flowing without completely closing the damaged portion 10.

  Moreover, what is necessary is just to adjust suitably the pressure at the time of press-fitting the mortar 20 into the gas path 2 according to the height which pushes up the mortar 20, and the moisture content of the mortar 20. If the pressure is too low, the mortar 20 cannot be pushed up to a predetermined height in the gas passage 2 (for example, a height of 2 m or more from the upper end of the hearth bed 18), which is not preferable because workability decreases. . On the other hand, if the pressure when the mortar 20 is pressed into the gas passage 2 is too high, the mortar 20 may be pushed up to a height higher than a necessary height (for example, a height from the hearth 18 to 5.5 m). This is undesirable.

Thereafter, the mortar 20 pushed up to the height of the upper end 11a of the first pipe 11 gets over the upper end 11a and overflows (enters) into the first pipe 11d. The mortar 20 that has entered the first pipe 11d moves to the mortar outlet 22 through the first pipe 11d, and is then collected by the collection unit 23.
When the mortar 20 starts to be recovered from the mortar discharge port 22, the press-fitting of the mortar 20 into the gap 11c is stopped. Thereafter, when the mortar 20 in the gap 11 c starts to harden, the gas passage repair device 30 is removed from the gas passage 2. Thereby, surplus mortar 20 is discharged below the gas path 2. Next, surplus mortar 20 staying inside the gas passage 2 is removed by a cleaning wire (not shown) to ensure the flowability of the fuel gas. At this time, since the mortar 20 has penetrated deep into the damaged portion 10, the mortar 20 in the damaged portion 10 remains without being removed.

According to the gas passage repair method of the present embodiment, pressure is applied to the mortar 20 by pressing the mortar 20 into the gap 11c of the gas passage 2 and pushing it upward from below. For this reason, the mortar 20 contacts the damaged portion 10 of the gas passage 2 while receiving a high pressing force. Therefore, the mortar 20 can penetrate deeply into the damaged part 10, and a high repair effect can be obtained for the damaged part 10.
Further, by inserting the mortar 20 into the gap 11c with the upper end 11a of the first pipe 11 being positioned in the gas passage 2, the mortar 20 pushed up to the height of the upper end 11a exceeds the upper end 11a. It enters 11d in the first pipe. Thereby, the height of the upper end of the repair range in the gas passage 2 can be easily set by adjusting the height of the upper end 11 a of the first pipe 11.

Further, since the gap between the lower end 2b of the gas passage 2 and the lower portion of the first pipe 11 is sealed by the sealing portion 15, the leakage of the mortar 20 from the sealing portion 15 to the outside of the gas passage 2 is prevented. Can do. For this reason, the repair work of the gas path 2 by the mortar 20 can be easily performed.
Further, since the sealing portion 15 includes the second pipe 12 and the bottom plate 13, the male screw portion 15 a is screwed to the female screw portion 15 b, whereby the outer peripheral surface 12 b ₁ of the second pipe 12 is connected to the gas path 2. Can be firmly fixed to the inner peripheral surface 2a. For this reason, leakage of the mortar 20 from the sealing portion 15 can be effectively prevented. Further, by the inner diameter D ₂ of the gas passage 2 is equal to the outer diameter D ₁₃ of the second pipe 12, by screwing the male screw portion 15a into the female screw portion 15b, and the inner circumferential surface 2a of the gas path 2 second 2 and the outer peripheral surface 12b ₁ of the pipe 12 are in close contact. For this reason, leakage of the mortar 20 from the sealing portion 15 can be effectively prevented.

Hereinafter, the present invention will be described based on examples.
When the state of the brick 8 in the gas supply line of the coke oven 50 where the flue temperature was lowered was examined, it was found that the flue temperature was partially lowered as shown in FIG. When a fiberscope was inserted into the gas passage 2 of the coke oven 50 and the state of the inner peripheral surface 2a was observed, a damaged portion 10 was found in the brick 8. From this, it was confirmed that a gas leak from the damaged portion 10 occurred.

Therefore, the gas passage 2 of the coke oven 50 was repaired using the gas passage repair device 30 shown in FIGS. 1A and 1B.
First, an under jet pipe (not shown) was removed from the gas passage 2. Next, the upper end 11 a of the first pipe 11 and the upper end 12 a ₁ of the second pipe 12 of the gas passage repair device 30 were inserted into the gas passage 2 from below. As the first pipe 11, a pipe having a height of 2000 mm from the lower surface 18a of the hearth plate 18 and an outer diameter D ₁₁ = 50 mm was used. Next, the male screw portion 15 a was screwed into the female screw portion 15 b, and the second pipe 12 was fixed to the lower end 2 b of the gas passage 2. As a result, the outer peripheral surface 11 b is arranged so as to maintain a predetermined gap 11 c between the outer peripheral surface 11 b and the inner peripheral surface 2 a of the gas passage 2, and the upper end 11 a of the first pipe 11 is positioned in the gas passage 2.

Next, the mortar 20 mainly composed of SiO ₂ and adjusted to a moisture addition of 30 mass% and a consistency of 380 is pushed up by 1.5 kg / cm ² from the mortar supply unit 19 of the press-in unit 14 using a mortar press-in machine (not shown). Press-fitted with pressure. As a result, the mortar 20 was sequentially pushed up into the gap 12c and the gap 11c. Then, when the mortar 20 began to be collected by the collection unit 23, the press-fitting of the mortar 20 into the gap 11c was stopped. Then, the state which pushed up the mortar 20 in the clearance gap 11c was maintained for 1 minute.
Thereafter, it was confirmed that the mortar 20 in the gap 11c started to harden, and the gas passage repair device 30 was removed from the gas passage 2. Thereby, the surplus mortar 20 was discharged | emitted from the gas path 2 below. Next, the inside of the gas passage 2 was cleaned with a cleaning wire, and the excess mortar 20 remaining inside the gas passage 2 was removed. Thereby, the flowability of the fuel gas in the gas passage 2 was ensured.
Thus, the brick crack repair in the gas passage 2 was completed.

  After repairing the gas passage 2, the fiberscope was inserted into the gas passage 2 again and the state of the inner peripheral surface 2 a was observed. As a result, the entire surface of the inner peripheral surface 2 a was covered with the mortar 20. In addition, it was confirmed that the mortar 20 was filled deeply into the crack 9, 10 parts of joints, and a portion where the brick was missing.

  FIG. 3 shows the results of the flue temperature when the coke oven 50 is operated after this repair is performed and the flue temperature when the coke oven 50 is operated before the repair. As shown in FIG. 3, in the coke oven 50 before repair, gas leaks are partially generated, and there are places where the combustion temperature does not rise (not heated) as shown by the line marked with ◇. . On the other hand, in the coke oven 50 after the gas passage 2 was repaired, it was confirmed that the combustion temperature of the flue was improved as indicated by the line marked with ■.

  As mentioned above, although one Embodiment and the Example of this invention were described, this invention is not limited only to these, The change in the range which does not deviate from a summary is contained in this invention.

2 Gas passage 2a Inner peripheral surface of gas passage 2b Lower end of gas passage 8 Brick 10 Damaged portion 11 First pipe 11a Upper end of first pipe 11b Outer peripheral surface of first pipe 11c Clearance 11d In the first pipe 12 Second pipe 12a ₁ Upper end of second pipe 12a ₂ Lower end of second pipe 12b ₁ Outer peripheral surface of second pipe 12b ₂ Inner peripheral surface of second pipe 12c Clearance 13 Bottom plate 14 Press-fit portion 15 Sealing portion 15a Male screw portion 15b Female screw portion 16 Stopper 17 Handle 18 Hearth plate 18a Bottom surface of hearth plate 18b Inner circumferential surface of hearth plate 19 Mortar supply unit 20 Mortar 21 Infiltration 22 Mortar outlet 23 Recovery unit 30 Gas passage repair device 50 Coke oven 101 Fuel gas 102 Gas passage 102a Gas passage inner surface 103 Combustion chamber 104 Combustion 105 Carbonization chamber 106 Pulverized coal 107 Under jet pie 108 outer diameter of D ₁₂ the second pipe inner diameter D ₁₃ second pipe inner diameter D ₁₁ first pipe brick 110 lesion 200 coke oven D ₂ gas path

Claims (3)

A method for repairing a damaged part of a gas passage of a coke oven,
The first pipe is inserted and arranged so that a predetermined gap is maintained with respect to the inner peripheral surface of the gas passage and the upper end is located in the gas passage .
Close the gap between the second pipe that covers the first pipe at a predetermined interval from its periphery and has a male screw at the tip, and the inner peripheral surface at the lower end of the second pipe and the outer peripheral surface of the first pipe. Inserting the second pipe of the sealing portion provided with a ring-shaped plate material into the lower end of the gas passage;
The male screw portion of the second pipe and the female screw portion provided at the lower end of the inner peripheral surface of the gas passage are screwed together, and the gap between the lower end of the gas passage and the lower portion of the first pipe is Sealing, and
Pressing the mortar into the gap from vertically downward to upward;
Recovering the mortar that has passed over the upper end of the first pipe and entered the first pipe;
A method for repairing a coke oven in a gas passage. A device for repairing a damaged part of a gas passage of a coke oven,
A first pipe disposed with a predetermined gap with respect to the inner peripheral surface of the gas passage and having an upper end positioned in the gas passage;
A sealing portion for sealing between a lower portion of the first pipe and a lower end of the gas passage;
A press-fit portion penetrating the sealing portion and communicating with the gap;
A mortar supply section for press-fitting mortar into the gap through the press-fit section;
A recovery unit provided at a lower portion of the first pipe and recovering the remaining mortar over the upper end of the first pipe;
I have a,
The sealing portion is
A second pipe having a male screw portion that covers the first pipe at a predetermined interval from the periphery thereof and has a male screw portion that is screwed into the female screw portion at the lower end of the inner peripheral surface of the gas passage;
Coke oven gas canal repair device, characterized in that it have a; and the ring-shaped plate closing between the inner peripheral surface and the outer peripheral surface of the first pipe at the lower end of the second pipe. The apparatus for repairing a coke oven gas path according to claim 2 , wherein an inner diameter of the gas path is equal to an outer diameter of the two pipes.

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