KR101428351B1 - Method for repairing inside of gas flue of coke oven, and device for repairing inside of gas flue - Google Patents

Abstract

The method for repairing a gas flue to the coke is a method for repairing a damaged portion of a gas flue to a coke oven. The method includes the steps of: maintaining a predetermined gap with respect to the inner circumferential surface of the gas flue; Inserting the mortar into the gap upward from below in the vertical direction; and recovering the mortar which has entered the first pipe beyond the upper end of the first pipe.

Description

Technical Field [0001] The present invention relates to a method of repairing a gas in a coke oven and a repair device in a gas flue,

The present invention relates to a repair method in a gas flue and a repair device in a gas flue.

The present application claims priority based on Japanese Patent Application No. 2010-087954 filed on April 6, 2010, the contents of which are incorporated herein by reference.

As coke oven, it is known that 60 to 110 furnaces are combined to constitute one furnace. Each of the above-mentioned furnaces is composed of a pair of carbonization chambers and combustion chambers alternately arranged in plural rows in the furnace width direction. The combustion chamber is adjacent to the carbonization chamber through a furnace wall formed by a soft burner and is divided into 20 to 30 small combustion chambers (flu) in the longitudinal direction of the furnace. The bottom portion of each small combustion chamber is connected to the preheating heat storage chamber and the fuel gas whose flow rate is adjusted by the fuel gas cock and the air whose flow rate is adjusted by the air cock are fed from the under- And is supplied to the heat storage chamber. Thereafter, the fuel gas and the air sent to the respective small combustion chambers are burned, so that the carbonization chambers on both sides in the furnace width direction of the combustion chamber are heated through the furnace wall. Thereby, the coal in the carbonization chamber is carried out.

The exhaust gas generated in each of the small combustion chambers is stored in the heat storage room for heat recovery and is heat-recovered. Thereafter, the exhaust gas is discharged into a horizontal flue (sole flue) provided in the bottom portion of the furnace, and is collected in the aggregate flue. This exhaust gas is distributed to both of the two fins installed at the two positions of the coke side CS and the pusher side PS, and then discharged from the chimney into the atmosphere.

In general, the preheating heat storage chamber is referred to as a "standing side" and the heat storage heat storage chamber is referred to as a "pulling side." The standing side and pulling side are alternately arranged in a combustion cycle (for example, a control cycle of 20 to 30 minutes) (See, for example, Patent Document 1).

As a fuel gas to be supplied to the combustion chamber, a mixed gas MG mixed with BFG (Blast Furnace Gas) and COG (Coke Oven Gas) is generally used. These fuel gases are supplied through a gas flue from a coke oven basement to a combustion chamber installed upright in a direction perpendicular to the paper surface. The fuel gas supplied by the under-jet method is burned in the combustion chamber to maintain the combustion chambers at a predetermined temperature.

Generally, the coke oven is a building made of refractory bricks, and the gas flue is constructed as a refractory brick as in coke oven.

4 is a schematic diagram of the coke oven 200. Fig. Each of the carbonization chambers 105 is disposed adjacent to the combustion chamber 103 and charged with coal (granular coal) 106 supplied from the upper portion thereof.

The fuel gas 101 is first supplied from the basement (not shown) provided below the coke oven 200 to the combustion chamber 103 through the gas flue 102 Supply. Subsequently, the fuel gas 101 is combusted 104 in the combustion chamber 103, and the fuel gas 101 is supplied 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 coal 106 is dry-streamed and coke is formed. Thereafter, the coke is extruded from the carbonization chamber 5 to the outside of the furnace by an extruder (not shown).

5 is a schematic cross-sectional view of the gas flue 102. Fig. The unillustrated fuel gas is supplied to the gas flue 102 via the under-jet pipe 107. The gas flue 102 is constructed by a flue 108 (with refractory flue). The inner peripheral surface 102a of the gas flue 102 is exposed to a high temperature of 1000 占 폚 or more at the time of combustion of the fuel gas 101. [ As a result, the damaged portion 110 such as cracks or joint breakage is generated in the softening trough 108 exposed on the inner peripheral surface 102a due to aging or long time burning. When the damaged portion 110 is generated in the softened portion 108 as described above, gas leakage of the fuel gas 101 is generated from the damaged portion 110, so that the temperature of the flue does not rise (the temperature in the gas flue 102 is not sufficiently raised ] State.

As a result, the coking of the 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 in the coke oven 200 and may not be extruded. As a result, there is a possibility that the operation of the coke oven 200 may be adversely affected.

Therefore, it is necessary to periodically check the inner circumferential surface 102a of the gas flue 103 to repair the damaged portion 110 partially.

BACKGROUND ART Conventionally, as a method of repairing a damaged part such as a crack or a joint breakage of a structure made of refractory materials, after damages are confirmed by a naked eye or a camera or a fiber scope, the mortar is sprayed to the part, (See, for example, Patent Document 2).

Japanese Patent Application Laid-Open No. 11-35944 Japanese Patent Application Laid-Open No. 7-278554

However, since the gas flue 102 is a narrow space, it is difficult to perform the maintenance work with the above-described repair method. Further, since the repairing agent can not be sprayed or applied to the damaged portion with a high pressing force, the repairing agent does not sufficiently penetrate deeply into the damaged portion. As a result, there has been a problem that the repairing effect of the damaged portion becomes insufficient. As for the method of repairing the coke oven gas in the coke oven, a method that is easy to install so far has not been proposed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a coke oven which is easy to construct when repairing a damaged portion such as cracks or tearing in a gas flue, And an object of the present invention is to provide a maintenance method and maintenance apparatus in the year.

The present invention solves the above-mentioned problems and adopts the following means in order to achieve this object.

(1) A method for repairing a gas flue in a coke oven according to an aspect of the present invention is a method for repairing a damaged portion of a gas flue in a coke oven, comprising the steps of: maintaining a predetermined gap with respect to an inner circumferential surface of the gas flue; A step of inserting mortar into the gap upward from below in the vertical direction, a step of recovering the mortar which has entered the first pipe beyond the upper end of the first pipe, Respectively.

(2) In the gas flush repair method described in (1) above, the lower end of the gas flue and the lower portion of the first pipe may be sealed before the mortar is press-fitted into the gap.

(3) A gas fired internal repairing apparatus according to one aspect of the present invention is a device for repairing a damaged portion of a gas flue in a coke oven. The apparatus maintains a predetermined gap with respect to an inner circumferential surface of the gas flue, A sealing portion for sealing between a lower portion of the first pipe and a lower end portion of the gas flue; a press-in portion communicating with the gap through the seal portion; and a press- And a recovery unit installed at a lower portion of the first pipe and recovering the remaining mortar over the upper end of the first pipe.

(4) In the gas-fired repairing apparatus described in (3), the sealing portion may include a second portion having a screw-engaging portion for covering the first pipe at a predetermined distance from its periphery, And a ring-shaped plate member that closes between the inner peripheral surface of the lower end of the second pipe and the outer peripheral surface of the first pipe.

(5) In the gas-fired repair apparatus described in (4) above, the inner diameter of the gas flue may be equal to the outer diameter of the second pipe.

According to the gas flush repair method of (1), the mortar is pressurized by pressurizing the mortar into the gap from the lower side to the upper side of the gas flue. As a result, the mortar is brought into contact with a damaged portion such as cracks or tearing of the strands with high pressing force. Therefore, the mortar can penetrate deeply into the damaged portion, and a high maintenance effect can be obtained. Further, since the mortar is press-fitted into the gap in the state where the upper end of the first pipe is located in the gas flue, the repair of the damaged portion by the mortar is performed in the range up to the height of the upper end of the first pipe. Therefore, by adjusting the position of the upper end of the first pipe, it is possible to easily set the repair range in the gas flue.

According to the gas flush repair method of (2), the leakage of the mortar from the outer peripheral surface of the first pipe to the inner peripheral surface of the gas flue is prevented. As a result, the maintenance work in the gas flue can be easily performed.

Further, according to the repair apparatus in the gas frying method according to (3), the mortar is pushed up from the lower side to the upper side of the gas flue in the state where the pressure is applied by pressurizing the mortar with the gap. As a result, the mortar can penetrate deeply into the damaged portion of the softener, and a high maintenance effect can be obtained. Further, by adjusting the position of the upper end of the first pipe, it is possible to easily set the upper end position of the repair range in the gas flue.

Further, according to the repair apparatus in the gas frying method according to (4), the lower portion of the first pipe and the lower end portion of the gas flue are tightly sealed. As a result, leakage of the mortar from the sealing portion can be prevented.

According to the gas-fired repair apparatus of (5), the second pipe is screwed to the lower end of the gas flue, so that the inner circumferential surface of the gas flue and the outer circumferential surface of the second pipe come into close contact with each other. As a result, leakage of the mortar from the sealing portion can be effectively prevented.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1A is a vertical cross-sectional view of a repair device in a gas flue according to an embodiment of the present invention; FIG.
1B is a plan view of the repair device in the gas flue according to the embodiment of the present invention when viewed from above.
2 is a longitudinal sectional view showing a method of repairing a gas flue using a repair apparatus in a gas flue according to an embodiment of the present invention.
3 is a graph showing the state of the flue temperature in the gas flue before and after the maintenance of the flue gas.
FIG. 4 is a longitudinal sectional view of a coke oven in which carbonaceous coal is burnt by burning fuel gas supplied to a combustion chamber through a gas flue.
5 is a cross-sectional perspective view showing the inner circumferential surface of the gas flue where the damaged portion is generated.

Hereinafter, a repair apparatus 30 in a gas fireduction system according to an embodiment of the present invention and a repair method in a gas fired state using the repair apparatus 30 in the gasification system will be described with reference to the drawings. In the following drawings, the scale is appropriately changed to make each member recognizable in size.

Fig. 1 (a) is a longitudinal sectional view showing the repair device 30 in the gas flue, and Fig. 1 (b) is a plan view when the repair device 30 in the gas flue is viewed from above.

As shown in Figs. 1A and 1B, the repair device 30 in the gas fired boiler is schematically constituted by a first pipe 11 and a sealing portion 15. As shown in Fig.

The outer diameter D ₁₁ of the first pipe 11 is smaller than the inner diameter D ₂ of the gas flue 2 to be described later. At the bottom of the first pipe (11), a recovery part (23) capable of recovering mortar is provided.

The sealing portion 15 is composed of the second pipe 12 and the bottom plate 13 and seals between the lower portion of the first pipe 11 and the lower end portion 2b of the gas flue 2 to be described later .

The second pipe 12 is disposed so as to cover the periphery (outer peripheral surface 11b) of the first pipe 11 with a predetermined gap therebetween. Thereby, a gap 12c is generated between the inner peripheral surface 12b ₂ of the second pipe 12 and the outer peripheral surface 11b 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 and the second pipe 12 and the first pipe 11 And are arranged in a concentric circle shape. In addition, the outer diameter D ₁₃ of the second pipe 12 is preferably equal to the inner diameter D ₂ of the gas flue (2) to be described later.

The second pipe 12 is provided with a threaded portion (male threaded portion 15a) so as to surround the outer peripheral surface 12b ₁ thereof. The male threaded portion 15a is screwed to the lower end portion 2b of the gas flame 2 to be described later. A press-in portion 14 for press-fitting a mortar is provided in the lower portion of the second pipe 12 so as to communicate with the gap 12c through the bottom plate 13. [ A mortar feeder 19 capable of press-fitting the mortar through the press-in portion 14 is provided in the gap 12c at the lower end of the press-in portion 14.

A stopper 16 and a handle 17 are provided on the outer circumferential surface 12b 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 threaded portion 15a. The shape of the handle 17 is not limited as long as the handle 17 is provided below the stopper 16 and is rotatable around the axis of the second pipe 12. [

The bottom plate 13 is made of, for example, a ring-shaped plate, and the inner peripheral surface 12b ₂ of the lower end 12a ₂ of the second pipe 12 and the outer peripheral surface 11b of the first pipe 11, As shown in Fig.

2 is a sectional schematic view showing a repair method of the gas flue 2 of the coke oven 50, using the repair device 30 in the gas flue shown in Figs. 1A and 1B. Hereinafter, an example of a repair method of the gas flue 2 will be described with reference to FIG.

First, an under-jet pipe (not shown) fixed to the lower portion of the gas flue 2 is removed. A furnace bottom plate 18 is provided under the gas flue 2. The under jet pipe is screwed to a lower end portion 2b of the gas flue 2 by a female screw portion 15b.

Subsequently, the upper end 11a of the first pipe 11 and the upper end 12a ₁ of the second pipe 12 of the gas-fired repair apparatus 30 are inserted into the gas flue 2 from below. Subsequently, the male threaded portion 15a of the second pipe 12 is screwed to the female threaded portion 15b to fix the second pipe 12 to the lower end portion 2b of the gas flue 2. At this time, the male thread 15a and the female thread 15b can be easily screwed together by operating the knob 17. Fig. The second pipe 12 is connected to the gas fl yper 2 by the threaded engagement of the male screw portion 15a and the female screw portion 15b until the stopper 16 abuts against the lower surface 18a of the furnace bottom plate 18. [ ).

It is preferable that the female screw portion 15b is provided on the inner circumferential surface 18b of the furnace bottom plate 18 from the viewpoint of easiness of fixing the second pipe 12 and the gas flue 2. However, The female thread portion 15b may not be provided on the inner circumferential surface 18b if the outer circumferential surface 12b of the gas cylinder 2 and the inner circumferential surface 2a of the gas cylinder 2 are in close contact with each other. In this case, for example, an elastic body made of rubber or plastic is provided on the outer circumferential surface 12b ₁ of the second pipe 12 so as to come into close contact with the inner circumferential surface 18b, whereby the second pipe 12 and the furnace bottom plate 18 ).

By thus securing the second pipe 12 to the gas flue 2, the first pipe 11 is inserted and disposed in the gas flue 2. [ The first pipe 11 is arranged such that the outer peripheral surface 11b of the first pipe 11 maintains a predetermined clearance 11c between the inner peripheral surface 2a and the inner peripheral surface 2a of the gas flue 2. [ Further, the upper end 11a of the first pipe 11 is arranged so as to be located in the gas flue 2. Further, the upper end portion 12a ₁ of the second pipe 12 is disposed, for example, in the furnace bottom plate 18.

Subsequently, the mortar 20 is press-fitted upward from below in the vertical direction from the mortar supply portion 19 of the press-fitting portion 14 by using a mortar presser not shown. The mortar 20, the outer peripheral surface (11b of the first pipe 11, the outer peripheral surface (11b) and the second inner peripheral surface of the pipe (12) (12b _2), the gap (12c), a first pipe (11) between the by And the gap 11c between the inner circumferential surface 2a of the gas flue 2 and the inner circumferential surface 2a of the gas flue 2.

As described above, the mortar 20 is press-fitted into the gap 11c from the lower side to the upper side to apply pressure to the mortar 20. As a result, the mortar 20 is brought into contact with the damaged portion 10 such as cracks or joint breakage of the quadrangular prism 8 of the coke oven 50 with a high pressing force. Thereby, the mortar 20 penetrates into the inside of the damaged portion 10 (21).

As the mortar 20 used in the present embodiment, known mortar can be used. The moisture content of the mortar 20 may be appropriately adjusted so that the fluidity enough to permeate the damaged portion 10 and the pump pressure-feeding property can be maintained when the mortar 20 is press-fitted into the gap 11c. Particularly, 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 completely blocking the damaged portion 10 and flowing away.

The pressure when the mortar 20 is press-fitted into the gas flue 2 may be appropriately adjusted in accordance with the height of pushing up the mortar 20 or the water content of the mortar 20. If the pressure is too low, the mortar 20 can not be pushed up to a predetermined height in the gas flue 2 (for example, 2 m or more from the upper end of the furnace bottom plate 18) . On the other hand, if the pressure at which the mortar 20 is press-fitted into the gas flue 2 is excessively high, the mortar 20 is brought to a height equal to or higher than the required height (for example, the height from the furnace bottom plate 18 to 5.5 m) There is a possibility of pushing up, which is not preferable.

Thereafter, the mortar 20 pushed up to the height of the upper end 11a of the first pipe 11 overflows (enters) the first pipe 11d beyond the upper end 11a. The mortar 20 which has entered the first pipe 11d moves to the mortar outlet 22 through the first pipe 11d and is collected by the collecting part 23. [

When the mortar 20 is recovered from the mortar outlet 22, the pressurization of the mortar 20 into the clearance 11c is stopped. Thereafter, the repair device 30 in the gas flue is removed from the gas flue 2 at the point when the mortar 20 in the clearance 11c begins to harden. Thereby, surplus mortar 20 is discharged to the lower side of the gas flue 2. Subsequently, surplus mortar 20 remaining in the gas flue 2 is removed by a cleaning steel wire (not shown) to ensure the flowability of the fuel gas. At this time, since the mortar 20 penetrates to the inside of the damaged portion 10, the mortar 20 in the damaged portion 10 remains without being removed.

According to the gas flush repair method of the present embodiment, the mortar 20 is press-fitted into the clearance 11c of the gas flue 2, and the pressure is applied to the mortar 20 by pushing it upward from below. As a result, the mortar 20 is brought into contact with the damaged portion 10 of the gas flue 2 while receiving a high pressing force. Therefore, the mortar 20 can penetrate deeply into the damaged portion 10, and a high maintenance effect can be obtained with respect to the damaged portion 10.

The mortar 20 is pressed into the gap 11c while the upper end portion 11a of the first pipe 11 is inserted into the gas flume 2 so that the mortar 20 is pushed up to the height of the upper end portion 11a, (20) goes into the first pipe (11d) beyond the upper end (11a). Thus, by adjusting the height of the upper end 11a of the first pipe 11, the height of the upper end of the repair range in the gas flue 2 can be easily set.

Since the lower end portion 2b of the gas flue 2 is sealed by the sealing portion 15 between the lower portion of the first pipe 11 and the lower portion 2b of the gas flue 2, It is possible to prevent the leakage of the air bag 20. As a result, the maintenance work of the gas flue 2 by the mortar 20 can be easily performed.

The sealing portion 15 is composed of the second pipe 12 and the bottom plate 13 so that the male screw portion 15a is screwed to the female screw portion 15b so that the outer peripheral surface of the second pipe 12 12b ₁ can be firmly fixed to the inner circumferential surface 2a of the gas flue 2. [ As a result, leakage of the mortar 20 from the sealing portion 15 can be effectively prevented. The inner diameter D ₂ of the gas flue ₂ is equal to the outer diameter D ₁₃ of the second pipe 12 so that the male threaded portion 15a is screwed to the female threaded portion 15b, 2a and the outer peripheral surface 12b ₁ of the second pipe 12 are in close contact with each other. As a result, leakage of the mortar 20 from the sealing portion 15 can be effectively prevented.

Example

Hereinafter, the present invention will be described on the basis of examples.

As a result of examining the state of the opening 8 of the gas supply line of the coke oven 50 with the reduced fl ow temperature, it was found that the fl ow temperature was partially lowered as shown in Fig. A fiber scope was inserted into the gas flue 2 of the coke oven 50 and the condition of the inner circumferential surface 2a was observed and the damaged portion 10 was found in the flue 8. From this, it was confirmed that gas leakage from the damaged portion 10 occurred.

Therefore, the repair of the gas flue 2 of the coke oven 50 was performed using the repair device 30 in the gas flue shown in Figs. 1A and 1B.

First, an under-jet pipe (not shown) was removed from the gas flue 2. Subsequently, the upper end 11a of the first pipe 11 and the upper end 12a ₁ of the second pipe 12 of the repair device 30 in the gas flue were inserted into the gas flue 2 from below. The first pipe 11, was used as the height 2000㎜, the outer diameter D ₁₁ = 50㎜ from the furnace floor plate 18 when (18a) of. The male threaded portion 15a is threadedly engaged with the female threaded portion 15b to fix the second pipe 12 to the lower end portion 2b of the gas flue 2. [ Thereby, the outer peripheral surface 11b holds a predetermined clearance 11c between the inner peripheral surface 2a of the gas flue 2 and the upper end 11a of the first pipe 11, Lt; / RTI >

Subsequently, the mortar 20 mainly composed of SiO ₂ and containing 30% by mass of water and adjusted to 380 was extruded from the mortar feeder 19 of the press-in portion 14 at a rate of 1.5 kg / cm 2 The pressure was increased. As a result, the mortar 20 is pushed up sequentially to the gap 12c and the gap 11c. Subsequently, when the mortar 20 is recovered by the recovery unit 23, the pressurization of the mortar 20 into the gap 11c is stopped. Thereafter, the state in which the mortar 20 was pushed into the gap 11c was held for 1 minute.

Thereafter, the repair device 30 in the gas flue was removed from the gas flue 2, confirming that the mortar 20 in the clearance 11c started to harden. Thus, the surplus mortar 20 was discharged downward from the gas flue 2. Subsequently, the inside of the gas flue 2 was cleaned by the cleaning steel wire, and the surplus mortar 20 which remained in the gas flue 2 was removed. Thus, the flowability of the fuel gas in the gas flue 2 was secured.

As a result of this, the cracks and cracks in the gas flue 2 are terminated.

After the repair of the gas flue 2, the fiber scope was again inserted into the gas flue 2 to observe the condition of the inner circumferential surface 2a, and the entire surface of the inner circumferential surface 2a was covered with the mortar 20. It was also confirmed that the mortar 20 was deeply filled in the crack 9, the joint break portion 10, and the fractured portion.

3 shows the results of the fluent temperature when the coke oven 50 is operated after this repair and the fluent temperature when the coke oven 50 is operated before the maintenance. As shown in Fig. 3, gas leaks partially occur in the coke oven 50 before maintenance, and there is a portion where the combustion temperature does not rise (no heat is generated) . On the other hand, in the coke oven 50 after the repair of the gas flue 2, the combustion temperature of the flue could be confirmed to be improved as shown by the line marked with the mark (2).

Although the embodiments and examples of the present invention have been described above, the present invention is not limited to these embodiments, and modifications within the scope of the present invention are included in the present invention.

2: Gas year
2a: inner circumferential surface of the gas flue
2b: the lower end of the gas flue
8: Yeonwa
10:
11: first pipe
11a: upper end of the first pipe
11b: outer peripheral surface of the first pipe
11c: Clearance
11d: in the first pipe
12: second pipe
12a ₁ : upper end of the second pipe
12a ₂ : lower end of the second pipe
12b ₁ : outer peripheral surface of the second pipe
12b ₂ : inner peripheral surface of the second pipe
12c: clearance
13: bottom plate
14:
15:
15a: Male threads
15b: female thread
16: Stopper
17: Handle
18: furnace bottom plate
18a: the bottom of the furnace bottom plate
18b: inner peripheral surface of the furnace bottom plate
19: Mortar supply section
20: Mortar
21: Penetration
22: Mortar outlet
23:
30: Repair device in the gas flue
50: Coke rods
101: Fuel gas
102: Gas Year
102a: gas-fired inner circumferential surface
103: Combustion chamber
104: Combustion
105: Carbonization chamber
106: Coal
107: Under-jet pipe
108: Kite
110:
200: Coke oven
D ₂ : inner diameter of the gas flue
D ₁₁ : Outer diameter of the first pipe
D ₁₂ : inner diameter of the second pipe
D ₁₃ : Outer diameter of the second pipe

Claims (5)

A method of repairing a damaged portion of a gas flue to a coke oven,
The first pipe is inserted and arranged such that a predetermined gap is maintained with respect to the inner circumferential surface of the gas flue and the upper end portion is located within the gas flue,
A second pipe covering the first pipe at a predetermined distance from its periphery and having a male screw portion at its distal end, and a ring-shaped second pipe for closing between an inner circumferential surface of a lower end portion of the second pipe and an outer circumferential surface of the first pipe Inserting the second pipe of the sealing portion having the plate material into the lower end portion of the gas flue;
Sealing the lower end of the gas flue and the lower portion of the first pipe by screwing the male threaded portion of the second pipe and the female threaded portion provided at the lower end of the inner peripheral surface of the gas flue;
A step of press-inserting the mortar in the gap from the lower direction toward the upper side in the vertical direction,
And recovering the mortar that has entered the first pipe beyond the upper end of the first pipe. delete An apparatus for repairing a damaged portion of a gas flue to a coke oven,
A first pipe which maintains a predetermined clearance with respect to an inner circumferential surface of the gas flue and is arranged so that an upper end is located in the gas flue;
A sealing portion that seals between a lower portion of the first pipe and a lower end portion of the gas flue;
A press-fitting portion penetrating the sealing portion and communicating with the gap,
A mortar supplying portion for injecting the mortar into the gap through the press-fitting portion,
And a recovery unit installed at a lower portion of the first pipe and recovering the remaining mortar over the upper end of the first pipe,
The sealing portion
A second pipe having a male threaded portion for screwing the first pipe to the female threaded portion of the lower end of the inner circumferential surface of the gas fl ow,
And a ring-shaped plate member for closing between an inner circumferential surface of the lower end of the second pipe and an outer circumferential surface of the first pipe. delete 4. A repair device in a coke furnace as in claim 3, wherein the inner diameter of the gas flue is equal to the outer diameter of the second pipe.

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