METHOD FOR REPAIRING INSIDE OF GAS FLUE OF COKE OVEN AND DEVICE
FOR REPAIRING INSIDE OF GAS FLUE
Field of the Invention
[0001]
The present invention relates to a method for repairing an inside of a gas flue of
a coke oven and a device for repairing an inside of a gas flue.
10 Priority is claimed on Japanese Patent Application No. 2010-087954, filed April
6, 2010, the content of which is incorporated herein by reference.
Related Art
15 [0002]
As a coke oven, a coke oven in which 60 to 110 furnaces are grouped to
configure a coke oven battery is known. Each furnace is made of a pair of a
carbonization chamber and a combustion chamber which are arranged alternately with
respect to_ each other in plural rows in a furnace width direction. The combustion
20 chamber is adjacent to the carbonization chamber through a furnace wall made of bricks,
and is partitioned into 20 to 30 small combustion chambers (flues) in a furnace length
direction. A bottom portion of each small combustion chamber communicates with a
regenerative chamber for preheating, and fuel gas for which a flow rate is adjusted by a
fuel gas cock, and air for which a flow rate adjusted by an air gas cock are supplied to
25 each regenerative chamber for preheating from an under jet pipe through the gas flue.
2
Then, the carbonization chambers in both sides of the furnace width direction of the
combustion chamber are heated through the furnace wall by burning the fuel gas and the
air sent to each small combustion chamber. Therefore, dry distillation of coal in the
carbonization chamber is performed.
5 [0003]
Exhaust gas generated from each small combustion chamber is accumulated in a
regenerative chamber for heat collection and heat collection is performed on the exhaust
gas. Then, the exhaust gas is discharged to a horizontal flue (a sole flue) which is
provided on a hearth portion, and gathered in a gathering flue. The exhaust gas is
10 distributed to both flues respectively provided in two places of a coke side (CS) and a
pusher side (PS), and discharged into the atmosphere from a chimney.
In general, the regenerative chamber for preheating is called "standing side" and
the regenerative chamber for heat collection is called "pulling side", and the standing
side and the pulling side are switched every burning cycle (for example, 20 to 30 minutes
15 of control period) (for example, refer to Patent Document 1).
[0004]
As the fuel gas supplied to the combustion chamber, mixed gas (MG) in which
normal BFG (Blast Furnace Gas) and COG (Coke Oven Gas) are mixed is used. The
fuel gas is supplied to the combustion chamber which is vertically provided in a vertical
20 direction to the ground through the gas flue from a basement of the coke oven. In such
a manner, by burning the fuel gas supplied in the under jet method in the combustion
chamber; each combustion chamber maintains a predetermined temperature.
[0005]
In general, a coke oven is a structure which is made of fire-resistant bricks, and a
25 gas flue is also built with fire-resistant bricks lilce the colce oven.
3
FIG. 4 is a schematic view of a coke oven 200. Each carbonization chamber
105 is disposed so as to be adjacent to a combustion chamber 103, and dust coal 106
(large particle coal) supplied from the upper portion thereof is charged thereinto.
In the coke oven 200, when coke is manufactured, first, fuel gas 101 is supplied
5 to the combustion chamber 103 through the gas flue 102 from the basement (not shown)
provided in the lower portion of the coke oven 200. Next, the fuel gas 101 is burned
104 in the combustion chamber 103, and the feed rate of the fuel gas 101 is managed so
that the inside of the combustion chamber 103 is maintained at approximately 1200°C.
Since the combustion chamber 103 is maintained at this temperature, the dust coal 106 is
10 dried by distillation to form coke. Then, the coke is extruded from the carbonization
chamber 5 to the outside of the furnace by an extruder, not shown.
[0006]
FIG. 5 is a sectional schematic view of the gas flue 102. The fuel gas, not
shown, is supplied to the gas flue 102 through an under jet pipe 107. The gas flue 102
15 is built with the bricks 108 (fire-resistant bricks). An inner peripheral surface 102a of
the gas flue 102 is exposed to a high temperature of 1000°C or more when the fuel gas
101 is burned. For this reason, a damaged portion 110 such as cracks and fractures is
generated in the brick 108 exposed to the inner peripheral surface 102a due to temporal
variation and long term combustion. When the damaged portion 110 is generated in the
20 brick 108, since gas leakage of the fuel gas 101 is generated in the damaged portion 110,
a state in which the temperature of the flue does not increase (the temperature of the gas
flue 102 does not increase sufficiently) is created.
As a result, the carbonization of coal is not sufficient performed in the
carbonization chamber 105, and when the coke is discharged (extruded) from the coke
25 oven 200, the coke is clogged in the coke oven 200 and is not extruded in some cases.
4
Due to this, there is a possibility of having a negative influence on the operation of the
coke oven 200.
[0007]
Accordingly, it is necessary to regularly check the inner peripheral surface 102a
5 of the gas flue 103 and to partially repair the damaged portion 110.
Conventionally, as a repairing method of a damaged portion such as cracks and
fractures of a structure made of fire-resistant bricks, after confirming the damaged
portion by visual observation, a camera, a fiberscope, and the like, for example, blasting
mortar, or applying repairing material such as a dry seal to the place is normally
10 performed (for example, refer to Patent Document 2).
Reference Documents
Patent Documents
[0008]
15 [Patent Document 1] Japanese Unexamined Patent Application, First
Publication No. Hl 1-35944.
[Patent Document 2] Japanese Unexamined Patent Application, First
Publication No. H7-278554.
20 Disclosure of the Invention
Problems to be Solved by the Invention
[0009]
However, since the gas flue 102 is a narrow space, it is difficult to perform a
repair operation in the above repairing method. Since it is not possible to blast or apply
25 repairing material to the damaged portion with a high pressing force, the repairing
material does not sufficiently penetrate into the back of the damaged portion. For this
reason, there is a problem that a repairing effect to the damaged portion is not sufficient.
Therefore, it is true that a method with easy work has not been proposed with respect to a
method of repairing an inside of a gas flue of a coke oven.
5 [0010]
The present invention is made considering the above, and an object of the
present invention is to provide a method for repairing an inside of a gas flue of a coke
oven which provides easy work when a damaged portion such as cracks and fractures of
brick in a gas flue is repaired and is capable of causing mortar to penetrate into the back
10 of the damaged portion, and a device for repairing an inside of a gas flue.
Methods for Solving the Problem
[0011]
The present invention employs following measures to solve the problems and
15 achieve a related object.
(1) A method for repairing an inside of a gas flue according to an aspect of the
present invention, which is for repairing a damaged portion in the gas flue of the coke
oven, the method includes a step of inserting and disposing a first pipe so that the first
pipe maintains a predetermined gap with respect to an inner peripheral surface of the gas
20 flue, and an upper end of the first pipe is located in the gas flue, a step of injecting a
mortar into the gap from a lower side to an upper side thereof in a vertical direction, and
a step of collecting the mortar which overflows from the upper end of the first pipe and
enters into an inside of the first pipe.
[0012]
25 (2) In the method for repairing the inside of the gas flue according to (1), a gap
6
between a lower end of the gas flue and a lower portion of the first pipe may be sealed
before the mortar is injected into the gap.
[0013]
(3) A device for repairing an inside of a gas flue according to an aspect of the
5 present invention, which is for repairing a damaged portion of the gas flue of the coke
oven, the device includes a first pipe which is disposed so that the first pipe maintains a
predetermined gap with respect to an inner peripheral surface of the gas flue, and an
upper end of the first pipe is located in the gas flue, a sealing portion which seals a gap
between a lower portion of the first pipe and a lower end of the gas flue, an injection
10 portion which penetrates the sealing portion and communicates with the gap, a mortar
supply portion which injects a mortar into the gap through the injection portion, and a
collection portion which is provided in the lower portion of the first pipe and collects the
redundant mortar overflowing from the upper end of the first pipe.
[0014]
15 (4) In the device for repairing the inside of the gas flue according to (3), the
sealing portion may have a second pipe which covers a periphery of the first pipe with a
predetermined gap and has a screwed portion which is screwed in the lower end of the
gas flue, and a ring-shaped plate which performs closure between an inner peripheral
surface in a lower end of the second pipe and an outer peripheral surface of the first pipe.
20 [0015]
(5) In the device for repairing the inside of the gas flue according to (4), an
internal diameter of the gas flue and an outer diameter of the second pipe may be
identical.
25 Effects of the Invention
[0016]
In the method.for repairing an inside of a gas flue according to (1), pressure is
applied to mortar by injecting the mortar into the gap from the lower side to the upper
side in the gas flue. The mortar makes contact with the damaged portion such as cracks
5 and fractures of brick while receiving a high pressing force. Accordingly, the mortar
can penetrate into the back of the damaged portion to obtain a high repairing effect.
Since the mortar is injected into the gap in a state in which the upper end of the first pipe
is located in the gas flue, repairing the damaged portion by the mortar is performed in a
range of the height of the upper end of the first pipe. Therefore, it is possible to easily
10 set a repair range in the gas flue by adjusting the upper end location of the first pipe.
[0017]
In the method for repairing the inside of the gas flue according to (2), the mortar
leakage between the outer peripheral surface of the first pipe and the inner peripheral
surface of the gas flue is prevented. Due to this, it is possible to easily perform a repair
15 operation in the gas flue.
[0018]
In the device for repairing an inside of a gas flue according to (3), the mortar is
pushed up from the lower side to the upper side in the gas flue in the state in which
pressure is applied to the mortar by injecting the mortar into the gap. For this reason,
20 the mortar can penetrate into the back of the damaged portion in the brick to obtain a
high repairing effect. It is possible to easily set the upper end location of a repair range
in the gas flue by adjusting the upper end location of the first pipe.
[0019]
In the device for repairing the inside of the gas flue according to (4), the gap
25 between the lower portion of the first pipe and the lower end of the gas flue is rigidly
8
sealed. Therefore, it is possible to prevent the mortar leakage from the sealing portion.
[0020]
In the device for repairing the inside of the gas flue according to (5), the inner
peripheral surface of the gas flue and the outer peripheral surface of the second pipe are
5 brought in close contact with each other by screwing the second pipe to the lower end of
the gas flue. Therefore, it is possible to effectively prevent the mortar leakage from the
sealing portion.
Brief Description of the Drawings
10 [0021]
FIG 1 A is a longitudinal sectional view of a device for repairing an inside of a
gas flue according to an embodiment of the present invention.
FIG. 1 B is a plan view of the device for repairing an inside of a gas flue when
seen from an upper direction.
15 FIG. 2 is a longitudinal sectional view showing a method for repairing a gas flue
using the device for repairing an inside of a gas flue.
FIG 3 is a graph showing a flue temperature state in the gas flue bciore and after
repairing the gas flue.
FIG 4 is a longitudinal sectional schematic view of the coke oven in which fuel
20 gas supplied to a combustion chamber through the gas flue is burned to dry coal by
distillation in a carbonization chamber.
FIG. 5 is a^perspective sectional view showing an inner peripheral surface of the
gas flue in which a damaged portion is generated.
25 Embodiments of the Invention
[0022]
Hereinafter, a device 30 for repairing an inside of a gas flue according to an
embodiment of the present invention and a method for repairing an inside of a gas flue
using the device 30 for repairing an inside of a gas flue will be described by referring to
5 drawings. In the drawings below, each member is appropriately altered in scale to have
a recognizable size.
[0023]
FIG. 1 A is a longitudinal sectional view of the device 30 for repairing an inside
of a gas flue, and FIG. l B a plan view of the device 30 for repairing an inside of a gas
10 flue when seen from an upper direction.
As shown in FIGS. 1A and 1B, the device 30 for repairing an inside of a gas flue
is schematically configured with a first pipe 11, and a sealing portion 15.
The first pipe 11 has an external diameter Drl smaller than an internal diameter
D2 of the gas flue 2 which will be described later. In a lower portion of the first pipe 11,
15 a collection portion 23 which can collect mortar is provided.
[0024]
The sealing portion 15 is made up of a second pipe 12 and a bottom plate 13,
and seals between the lower portion of the first pipe 11 and a lower end 2b of the gas flue
2 described later.
20 The second pipe 12 is disposed so as to cover a periphery (an outer peripheral
surface 1 lb) of the first pipe 11 at a predetermined interval. Due to this, a gap 12c is
generated between an inner peripheral surface 12b 2 of the second pipe 12 and the outer
peripheral surface l lb of the first pipe 11. An internal diameter DI2 of the second pipe
12 is larger than the external diameter D11 of the first pipe 11, and the second pipe 12 and
25 the first pipe 11 are disposed so as to have a concentric circular shape as shown in FIG.
10
lB seen in plan view. It is preferable that an external diameter D13 of the second pipe
12 and the internal diameter D2 of the gas flue 2 described later be identical.
[0025]
A screwed portion (a male screw portion 15a) is provided in the second pipe 12
5 so as to surround an outer peripheral surface 12b1 thereof The male screw portion 15a
is screwed to the lower end 2b of the gas flue 2 described later. An injection portion 14
for injecting mortar is provided in the lower portion of the second pipe 12 so as to
penetrate the bottom plate 13 to communicate with the gap 12c. A mortar supply
portion 19 which can inject mortar through the injection portion 14 in the gap 12c is
10 provided in a lower end of the injection portion 14.
A stopper 16 and a handle 17 are provided on the outer peripheral surface 12b1
of the second pipe 12. The stopper 16 is made of, for example, a ring-shaped plate, and
is provided on a lower side of the male screw portion 15a. The handle 17 is provided in
a lower side of the stopper 16 and is not limited in shape as long as the handle can rotate
15 around the second pipe 12 as a shaft center.
The bottom plate 13 is made of, for example, a ring-shaped plate and is provided
so as to close an inner peripheral surface 12b2 in a lower end 12a2 of the second pipe 12
and the outer peripheral surface 11 b of the first pipe 11.
[0026]
20 FIG. 2 is a sectional schematic view showing a method for repairing the gas flue
2 of a coke oven 50 using the device 30 for repairing an inside of a gas flue shown in
FIGS. iA and lB. Hereinafter, an example of the method for repairing the gas flue 2
will be described using FIG. 2.
First, an under jet pipe which is fixed in the lower portion of the gas flue 2 and
25 not shown is removed. A hearth board 18 is provided in the lower portion of the gas
11
flue 2, and the under jet pipe is screwed to the lower end 2b of the gas flue 2 by a female
screw portion 15b.
Next, an upper end 11 a of the first pipe 11 and an upper end 12a1 of the second
pipe 12 in the device 30 for repairing an inside of a gas flue are inserted into the gas flue
5 2 from the lower side. Then, the male screw portion 15a of the second pipe 12 is
screwed to the female screw portion 15b and the second pipe 12 is fixed to the lower end
2b of the gas flue 2. At this time, the male screw portion 15a and the female screw
portion 15b can be easily screwed by operating the handle 17. Until the stopper 16
comes into contact with a lower surface 18a of the hearth board 18 by screwing the male
10 screw portion 15a and the female screw portion 15b, the second pipe 12 is inserted into
the gas flue 2.
[0027]
It is preferable that the female screw portion 1 Sb be provided on an inner
peripheral surface 18b of the hearth board 18 with regard to ease of fixing the second
15 pipe 12 to the gas flue 2, but the female screw portion 15b may not be provided on the
inner peripheral surface 18b as long as the outer peripheral surface 12b of the second
pipe 2 and the inner peripheral surface 2a of the gas flue 2 can be in close contact with
each other. In such a case, for example, an elastic body made of rubber and plastic may
be provided on the outer peripheral surface 12b, of the second pipe 12 and be in close
20 contact with the inner peripheral surface 18b to fix the second pipe 12 and the hearth
board 18.
In such a manner, the first pipe 11 is inserted and disposed in the gas flue 2 by
fixing the second pipe 12 to the gas flue 2. Due to this, the first pipe 11 is disposed so
that the outer peripheral surface 11 b maintains a predetermined gap I1 c with respect to
25 the inner peripheral surface 2a of the gas flue 2. The upper end l la of the first pipe 11
is disposed in the gas flue 2. The upper end 12a1 of the second pipe 12 is disposed to be
located on the hearth board 18, for example.
[0028]
Next, mortar 20 is injected from the mortar supply portion 19 of the injection
5 portion 14 from a lower side to an upper side in a vertical direction by using a mortar
injecting machine which is not shown. Due to this, the mortar 20 is sequentially pushed
up to the gap 12c between the outer peripheral surface 11 b of the first pipe 11 and the
inner peripheral surface I2b2 of the second pipe 12, and the gap I1 c between the outer
peripheral surface 1 lb of the first pipe 11 and the inner peripheral surface 2a of the gas
10 flue 2.
In this manner, the mortar 20 is injected into the gap l lc from the lower side to
the upper side to apply pressure to the mortar 20. For this reason, the mortar 20 makes
contact with the damaged portion 10 such as cracks and fractures of the brick 8 of the
coke oven 50 with a high pressing force. By doing this, the mortar 20 penetrates 21 into
15 the back of the damaged portion 10.
[0029]
As the mortar 20 used in the embodiment, known mortar can be used. The
moisture content of the mortar 20 may be appropriately adjusted so as to maintain
fluidity and pumpability to penetrate into the damaged portion 10 when the mortar 20 is
20 injected into the gap 11c. In particular, when the damaged portion 10 is large, it is
preferable to adjust the moisture content of the mortar 20 as necessary to prevent the
mortar 20 from flowing without completely blocking the damaged portion 10.
[0030]
The pressure at the time of injecting the mortar 20 into the gas flue 2, may be
25 appropriately adjusted based on the height where the mortar 20 is pushed up and the
13
moisture content of the mortar 20. When the pressure is too low, it is not possible to
push up the mortar 20 to a predetermined height in the gas flue 2 (for example, a height
of 2 in or more from the upper end of the hearth board 18), and thereby, workability is
deteriorated, which is not preferable. Meanwhile, when the pressure at the time of
5 injecting the mortar 20 into the gas flue 2 is too high, there is a possibility that the mortar
20 is pushed up above the required height (for example, a height of 5.5 in from the hearth
board 18), which is not preferable.
[0031]
Then, the mortar 20 which is pushed up to the height of the upper end 11 a of the
10 first pipe 11 overflows the upper end 11 a and overflows (enters) into an inside 11 d of the
first pipe. The mortar 20 entered into the inside 11 d of the first pipe is moved to a
mortar outlet 22 through the inside I1d of the first pipe, and collected by the collection
portion 23.
Injecting mortar 20 into the gap l lc is stopped when the mortar 20 begins to be
15 collected from the mortar outlet 22. Then, the device 30 for repairing an inside of a gas
flue is removed from the gas flue 2 when the mortar 20 in the gap 11 c begins to harden.
Due to this, the redundant mortar 20 is discharged to the lower side of the gas flue 2.
Next, the redundant mortar 20 remained in the gas flue 2 is removed by an annealing
wire for cleaning, not shown, to secure fluidity of fuel gas. At this time, since the
20 mortar 20 penetrates into the back of the damaged portion 10, the mortar 20 in the
damaged portion 10 remains without being removed.
[0032]
According to the method of repairing an inside of a gas flue of the embodiment,
the mortar 20 is injected into the gap I l e of the gas flue 2, and pushed up to the upper
25 side from the lower side to apply pressure to the mortar 20. Due to this, the mortar 20
14
makes contact with the damaged portion 10 of the gas flue 2 while receiving a high
pressing force. Accordingly, the mortar 20 can penetrate into the back of the damaged
portion 10 to obtain a high repairing effect to the damaged portion 10.
By injecting the mortar 20 into the gap 11c in a state in which the upper end 11a
5 of the first pipe 11 is inserted so as to be located in the gas flue 2, the mortar 20 pushed
up to the height of the upper end lla overflows the upper end lla and enters the inside
lid of the first pipe . Therefore , it is possible to easily set the height of the upper end in
a repair range in the gas flue 2 by adjusting the height of the upper end l la of the first
pipe 11.
10 [0033]
Since the sealing portion 15 seals between the lower end 2b of the gas flue 2 and
the lower end of the first pipe 11, it is possible to prevent the mortar 20 from leaking out
of the gas flue 2 from the sealing portion 15. For this reason, a repair operation of the
gas flue 2 by the mortar 20 can be easily performed.
15 Since the sealing portion 15 is made up of the second pipe 12 and the bottom
plate 13, the outer peripheral surface 12b, of the second pipe 12 can be rigidly fixed to
the inner peripheral sur face 2a of the gas flue 2 by screwing the male screw portion 15a
to the female screw portion 15b. For this reason, the leakage of the mortar 20 from the
sealing portion 15 can be effectively prevented. Furthermore, since the internal
20 diameter D2 of the gas flue 2 and the external diameter D13 of the second pipe 12 are
identical, the inner peripheral surface 2a of the gas flue 2 and the outer peripheral surface
12bi of the second pipe 12 are brought into close contact with each other by screwing the
male screw portion 15a to the female screw portion 15b. For this reason, the leakage of
the mortar 20 from the sealing portion 15 can be effectively prevented.
25 Example
15
[0034]
The present invention will be described based on examples.
When the state of the brick 8 of a gas supply line in the coke oven 50 in which
the flue temperature was lowered was examined , it became clear that the flue temperature
5 was partially lowered as shown in FIG. 3. When a fiberscope was inserted into the gas
flue 2 of the coke oven 50 to observe the state of the inner peripheral surface 2a, the
damaged portion 10 in the brick 8 was found . Due to this , it was confirmed that there
was gas leakage from the damaged portion 10.
[0035]
10 The gas flue 2 of the coke oven 50 was repaired using the device 30 for
repairing an inside of a gas flue shown in FIGS. IA and III.
First, the under jet pipe not shown was removed from the gas flue 2. The upper
end 11 a of the first pipe 11 and the upper end 12a1 of the second pipe 12 of the device 30
for repairing an inside of a gas flue were inserted from the lower side of the gas flue 2.
15 As the first pipe 11, a pipe with height of 2000 mm from the lower surface 18a of the
hearth board 18, and the external diameter Di j=50 mm was used. The male screw
portion 15a was screwed to the female screw portion 15b to fix the second pipe 12 to the
lower end 2b of the gas flue 2. The outer peripheral surface l lb maintained the
predetermined gap 11 c with respect to the inner peripheral surface 2a of the gas flue 2,
20 and the upper end 11 a of the first pipe 11 was disposed so as to be located in the gas flue
2.
[0036]
The mortar 20 which is mainly composed of SiO2, and adjusted to have 30
mass% of added water, and a consistency of 380 was injected from the mortar supply
25 portion 19 of the injection portion 14 using the mortar injecting machine, not shown,
16
with a push-up pressure of 1.5 kg/cm2. The mortar 20 was sequentially pushed up to the
gap 12c and the gap l lc. When the mortar 20 began to be collected by the collection
portion 23, injecting the mortar 20 into the gap He was stopped. The mortar 20
maintained the state of being pushed up in the gap l lc for a minute.
5 Then, it was confirmed that the mortar 20 in the gap 11 c was hardened, and the
device 30 for repairing an inside of a gas flue was removed from the gas flue 2. The
redundant mortar 20 was discharged from the gas flue 2 to the lower side. The inside of
the gas flue 2 was cleaned by the annealing wire for cleaning, and the redundant mortar
20 remaining in the gas flue 2 was removed. Therefore, fluidity of fuel gas in the gas
10 flue 2 was secured.
As above, the crack repair of the brick in the gas flue 2 was completed.
[0037]
After repairing the gas flue 2, when the fiberscope was inserted into the gas flue
2 again to observe the state of the inner peripheral surface 2a, the entire surface of the
15 inner peripheral surface 2a was covered with the mortar-20. It was confirmed that the
mortar 20 was charged to the back of the cracks 9, the fractures 10, and a broken part of
the brick.
[0038]
The flue temperature when the coke oven 50 was operated after the repairing
20 and the flue temperature when the coke oven 50 was operated before the repairing are
collectively shown in FIG. 3 as a result. As shown in FIG. 3, there was a partial gas
leakage in the coke oven 50 before the repairing, and there were some places where
combustion temperature did not increase (not heated) as indicated by a line with 0. On
the contrary, it could be confirmed that the combustion temperature of the flue in the
25 coke oven 50 after repairing the gas flue 2 was improved as indicated by a line with ®.
17
[0039]
As above, although the embodiments and the examples of the present invention
have been described, the present invention is not limited to this, and alterations in the
range not departing from the gist of the present invention are also included in the present
invention.
Description of the Reference Symbols
[0040]
2 Gas flue
10 2a Inner peripheral surface of gas flue
2b Lower end of gas flue
8 Brick
10 Damaged portion
11 First pipe
15 11 a Upper end of first pipe
I lb Outer peripheral surface of first pipe
Ile Gap
lid Inside of first pipe
12 Second pipe
20 12a1 Upper end of second pipe
12a2 Lower end of second pipe
12b1 Outer peripheral surface of second pipe
12b2 Inner peripheral surface of second pipe
12c Gap
25 13 Bottom plate
18
14 Injection portion
15 Scaling portion
15a Male screw portion
15b Female screw portion
5 16 Stopper
17 Handle
18 Hearth board
18a Lower surface of hearth board
18b Inner peripheral surface of hearth board
10 19 Mortar supply portion
20 Mortar
21 Penetrate
22 Mortar outlet
23 Collection portion
15 30 Device for repairing inside of gas flue
50 Coke oven
101 Fuel gas
102 Gas flue
102a Inner peripheral surface of gas flue
20 103 Combustion chamber
104 Burn
105 Carbonization chamber
106 Dust coal
107 Under jet pipe
25 108 Brick
19
110 Damaged portion
200 Coke oven
D2 Internal diameter of gas flue
D11 External diameter of first pipe
5 D12 Internal diameter of second pipe
D13 External diameter of second pipe
20

CLAIMS
1. A method for repairing an inside of a gas flue of a coke oven, which is for
5 repairing a damaged portion in the gas flue of the coke oven, the method comprising:
a step of inserting and disposing a first pipe so that the first pipe maintains a
predetermined gap with respect to an inner peripheral surface of the gas flue, and an
upper end of the first pipe is located in the gas flue;
a step of injecting a mortar into the gap from a lower side to an upper side
10 thereof in a vertical direction; and
a step of collecting the mortar which overflows from the upper end of the first
pipe and enters into an inside of the first pipe.
2. The method for repairing the inside of the gas flue of the coke oven
15 according to Claim 1, wherein a gap between a lower end of the gas flue and a lower
portion of the first pipe is sealed before the mortar is injected into the gap.
3. A device for repairing an inside of a gas flue of a coke oven, which is for
repairing a damaged portion of the gas flue of the coke oven, the device comprising:
20 a first pipe which is disposed so that the first pipe maintains a predetermined gap
with respect to an inner peripheral surface of the gas flue, and an upper end of the first
pipe is located in the gas flue;
a sealing portion which seals a gap between a lower portion of the first pipe and
a lower end of the gas flue;
25 an injection portion which penetrates the sealing portion and communicates with
21
the gap;
a mortar supply portion which injects a mortar into the gap through the injection
portion; and
a collection portion which is provided in the lower portion of the first pipe and
collects the redundant mortar overflowing from the upper end of the first pipe.
4. The device for repairing the inside of the gas flue of the coke oven
according to Claim 3, wherein the sealing portion comprises:
a second pipe which covers a periphery of the first pipe with a predetermined
10 gap and has a screwed portion which is screwed in the lower end of the gas flue; and
acing-shaped plate which performs closure between an inner peripheral surface
in a lower end of the second pipe and an outer peripheral surface of the first pipe.
5. The device for repairing the inside of the gas flue of the coke oven
15 according to Claim 4, wherein an internal diameter of the gas flue and an outer diameter
of the second pipe are identical.