JP5211892B2 - Coke oven drying hole closing method, and coke oven drying hole brick - Google Patents

Description

  The present invention relates to a method for closing a drying hole of a coke oven and a brick for drying holes of a coke oven.

  Conventionally, in a coke oven, a drying hole penetrating the combustion chamber and the carbonization chamber is formed on the wall surface of the carbonization chamber in order to promote vapor dissipation in the furnace that occurs in the carbonization chamber during drying after the furnace is built. . This drying hole is formed to release the steam generated during drying of the mortar used at the time of building in the carbonization chamber without releasing it from the combustion chamber. When actual operation is performed, the gas during dry distillation enters the combustion chamber, causing black smoke and soot to be generated.

For this reason, it is necessary to close the drying hole with plug bricks after the construction of the furnace and before the start of actual operation by charging coal.
However, there is a problem that the worker has to work in a state where it is exposed to high-temperature hot air, and the work load is large. In addition, the work is performed by applying mortar to the outer peripheral surface of the plug brick and inserting the plug brick into the drying hole, but manual insertion takes time and the applied mortar dries in a short time. It is difficult to express the adhesive strength at the time of normal temperature construction, and the stopper may fall off at the start of operation or the stopper may stick out to the carbonization chamber side. However, there is a problem that the load on the operator increases and the operating rate of the coke oven also decreases.
On the other hand, in order to solve this, for example, it is conceivable that the dry hole is blocked using the thermal spray repair method described in Patent Document 1.

JP 2007-177227 A

  However, the method of closing the drying hole by thermal spraying described in Patent Document 1 originally does not have sufficient adhesive strength of the thermal spray material, penetrating like a dry hole and impinging the thermal spray material on the back side. If there is nothing, the sprayed material will blow through to the combustion chamber side in construction, so it is difficult to construct until it is closed, and even if a construction body can be formed, there is no mechanical catch structure, so it is There is a possibility of dropping off due to vibration or pressure difference from the combustion chamber side.

  An object of the present invention is to provide a method for closing a drying hole of a coke oven and a brick for a drying hole of a coke oven that can surely prevent gas leakage between the combustion chamber and the carbonization chamber without falling off even for long-term use. It is to provide.

The gist of the present invention is as follows.
(1) A method for closing a drying hole of a coke oven, in which the drying hole of the coke oven is closed with a plug brick,
The drying hole is formed on the inner peripheral surface of the drying hole and a restriction portion that restricts the penetration of the plug brick, and the end portion of the plug brick is engaged, and the plug brick is opposite to the restriction portion. And a recess for preventing the
Applying mortar to the plug brick outer peripheral surface;
Inserting the plug brick coated with mortar into the drying hole;
And a step of engaging an end portion of the plug brick with the hollow portion.

(2) In the method for closing the drying hole of the coke oven according to (1),
A method for closing a drying hole of a coke oven, wherein a step of filling the drying hole with a thermal spray material after engaging an end of the plug brick with the depression.
(3) In the method for closing a dry hole of a coke oven according to (1) or (2),
The restriction portion has an opening diameter of the opening portion on the combustion chamber side of the coke oven that is smaller than the maximum diameter of the plug brick,
The step of inserting the plug brick into the drying hole includes inserting the plug brick into the drying hole by punching out the plug brick with a pressurized gas.

(4) A coke oven wall of the coke oven is configured, and the coke oven drying hole brick is formed with the drying hole brick of the coke oven,
The drying hole has a regulating portion for regulating the penetration of the stopper brick for closing the drying holes, is formed on the inner peripheral surface of the drying hole, the end portion of the plug bricks engage, the restricting direction of the restricting portion A brick for drying holes in a coke oven , comprising: a depression for preventing the plug brick from falling off in the opposite direction .
(5) In the brick for drying holes of the coke oven according to (4),
The restricting portion has a tapered cross section in which the opening diameter gradually decreases from one side surface to the other side surface, and the opening diameter of the other side surface is smaller than the maximum diameter of the plug brick. Brick for drying holes in coke ovens.

  According to the present invention, by having the restriction portion and the depression portion in the drying hole, the restriction portion prevents the plug brick from penetrating through the drying hole, and the depression portion is opposite to the restriction direction of the restriction portion. Since the plug bricks are prevented from falling off, the drying holes can be reliably supported mechanically by the plug bricks and will not drop out even after long-term use. Gas leakage can be prevented.

The present invention relates to a method for closing a drying hole of a coke oven in which the drying hole of a coke oven is closed with a plug brick, wherein the drying hole includes a regulating portion for restricting penetration of the plug brick, and an inner peripheral surface of the drying hole. The plug brick is engaged with the end of the plug brick, and has a recess that prevents the plug brick from falling off in the direction opposite to the regulating portion, and mortar is applied to the outer peripheral surface of the plug brick. A step, a step of inserting the plug brick coated with mortar into the drying hole, and a step of engaging an end portion of the plug brick with the recess.
Here, the step of inserting the plug brick in which the mortar is applied to the dry hole is formed with a hole in the approximate center of the plug brick, and an L-shaped hardware is engaged therewith, and the coal charging inlet of the coke oven The plug brick may be inserted into the drying hole manually, but may be inserted using a pressurized gas as will be described later.

In the present invention, the end of the plug brick may be engaged with the recess, and then the construction may be completed. However, it is preferable to carry out the step of filling the dry hole with a thermal spray material.
According to the present invention, by filling the dry hole with the thermal spray material, the stepped recess formed between the end surface of the plug brick after the plug brick is inserted and the carbonization chamber wall surface is substantially the same as the carbonization chamber wall surface. Since the same surface can be finished, there is no increase in extrusion resistance when coke is extruded during actual operation. Moreover, since the dry hole is closed with plug brick, even if the spray hole is filled with the sprayed material, the plug brick does not fall out to the combustion chamber side with the plug brick as a support.

In the present invention, the restricting portion has an opening diameter of the opening on the combustion chamber side of the coke oven smaller than the maximum diameter of the plug brick, and the step of inserting the plug brick into the drying hole includes the step of It is preferable to insert the plug brick into the drying hole by punching the plug brick with pressurized gas.
Here, the type of pressurized gas for ejecting the plug brick is not particularly limited, but air is generally used from the viewpoint of cost.
Moreover, as a structure of a control part, if the opening shape of the surface by the side of a combustion chamber is small with respect to the opening shape of the surface by the side of the carbonization chamber of a coke oven, various shapes and structures can be employ | adopted.
For example, the restricting portion may have a narrowest portion formed in the vicinity of the side surface on the combustion chamber side so as to protrude to the inside of the opening, and the diameter of the drying hole gradually increases from the carbonization chamber side surface toward the combustion chamber side surface. It may have a taper-shaped cross section that gradually decreases.

According to this invention, since the plug brick is inserted by using a pressurized gas, it is not necessary for the operator to manually insert the plug brick into the drying hole, thereby reducing the work burden on the operator. In particular, the work burden from the coal charging inlet of the coke oven can be greatly reduced.
Also, by forming the narrowest part on the combustion chamber side or by forming a restricting portion with a tapered cross section, even if the plug brick is driven out with pressurized gas, the movement of the plug brick is restricted by the restricting portion, and the combustion chamber It is possible to reliably prevent the plug brick from penetrating to the side and falling off.

  The present invention is also established as a drying hole brick for a coke oven exclusively used in the above-described method for closing a drying hole in a coke oven, and using the drying hole brick, a method for closing the drying hole in the coke oven described above. By carrying out the above, it is possible to previously form a recess or the like inside the drying hole at the stage of brick building, so that the burden on the operator in the method for closing the drying hole in the coke oven can be further reduced.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a cross-sectional view of a coke oven 1 for carrying out a method for closing a drying hole of a coke oven according to an embodiment of the present invention.
The coke oven 1 includes a carbonization chamber having a length of approximately 16 m (paper width direction), a width of approximately 400 mm (paper depth direction), and a height of approximately 6.5 m, and a plurality of combustion chambers adjacent to the carbonization chamber in the width direction. It is arranged and arranged.

A plurality of drying holes 4 are formed above the carbonization chamber wall 2 that partitions the carbonization chamber and the combustion chamber, and below the coal inlet 3 (H1 = 1500 mm to 2000 mm).
The plurality of drying holes 4 communicate with the combustion chamber and the carbonization chamber at the time of building the furnace, and the steam generated when drying the refractory material such as mortar used for brick stacking in the carbonization chamber is combusted from the carbonization chamber. It is formed to discharge outside through the chamber.
After the drying of the inside of the carbonization chamber is finished, if the actual operation is started as it is, the gas generated during the carbonization of the coal charged into the carbonization chamber will enter the combustion chamber, causing black smoke and soot generation. Before starting the actual operation, it is necessary to block the drying hole 4 and prevent gas from entering the combustion chamber.

FIG. 2 shows a state in which the drying hole 4 is closed with the plug brick 6. The drying hole 4 communicating with the carbonization chamber and the combustion chamber is formed in the drying hole brick 5, and the drying hole brick 5 constitutes the carbonization chamber wall 2 together with other bricks.
The drying hole 4 is a hole having a tapered cross section in which the opening diameter gradually decreases from the carbonization chamber side surface toward the combustion chamber side surface. A recess 51 is formed with which the end engages.
A mortar 7 is attached around the plug brick 6 and a step formed between the end surface of the plug brick 6 after the plug brick 6 is inserted into the drying hole 4 and the wall surface of the carbonization chamber wall 2. The recess is filled with a thermal spray material 8, and the finished surface of the thermal spray material 8 is substantially flush with the brick wall surface of the carbonization chamber wall 2.

As shown in FIG. 3, the drying hole brick 5 is formed by forming a through hole in a rectangular brick having a thickness L1 of approximately 230 mm, and the drying hole 4 has a diameter D1 of one of the openings. The diameter D2 of the other opening is 100 mm, and is formed as a tapered hole having a diameter of approximately 70 mm. The diameter D1 is directed toward the carbonization chamber wall 2 side.
The opening on the diameter D2 side functions as a restricting portion that prevents the plug brick 6 from penetrating and dropping off to the combustion chamber side.

The recess 51 is formed at a position deeper than the opening on the diameter D1 side by the depth dimension L2, and is formed as a recess having a depth dimension D3. In addition, it is preferable that the depth dimension L2 of the hollow part 51 is at least 5 mm or more, and the depth dimension D3 is at least 5 mm or more.
If the dimension L2 is less than 5mm, it may be lost due to collision between bricks during construction or work mistakes, or temperature fluctuation during operation. If the depth dimension D3 is less than 5mm, the plug brick 6 This is because there is a possibility that the engagement is not sufficient.

Further, the recess 51 is formed with a length of an angle θ1 in the circumferential direction of the drying hole 4, and the angle θ1 is preferably approximately 90 degrees or more. Similarly, the plug brick 6 is securely engaged.
Such dry-hole bricks 5 are formed by using a generally used powder, such as high-pressure press molding, and then hollowed using a spoon or a small portable electric grinder in a green state before drying. It can manufacture by forming the part 51 and baking this after that. In addition, if an organic resin in the form of a predetermined depression is incorporated at the time of molding and baked as it is, the organic resin disappears, so that the predetermined depression 51 can be formed.
In addition to the shape of the dry hole brick 5 as described above, for example, the dry hole 4 is formed as a substantially cylindrical hole having a dimension D1 as in the dry hole brick 5A shown in FIG. The narrowest portion 52 having the dimension D2 may be formed on the side.

As shown in FIG. 5, the plug brick 6 is a frustoconical brick having a bottom surface diameter D4 of approximately 80 mm, a tip surface diameter D5 of approximately 75 mm, and a height L3, and is substantially at the center of the bottom surface on the diameter D4 side. A hole 61 having a diameter of about 15 mm is formed. Although the hole 61 will be described in detail later, a compressed air pipe is inserted during construction. Note that the dimension L3 is determined according to the thickness of the thermal spray material 8 formed on the carbonization chamber side so that the thermal spray material 8 has a thickness of at least 10 mm so that the thermal spray material can be subjected to temperature fluctuations during operation. 8 secures the strength to prevent peeling. Specifically, for example, if the thickness dimension L1 of the dry hole brick 5 is about 230 mm, the dimension L3 is preferably about 170 mm.
Moreover, since the plug brick 6 is a thing which an operator works using a compressed air pipe, it is preferable to set it as the mass which considered compressed air insertion and the workability | operativity of an operator, and is a heat insulation brick or a low heat conductive castable. It is preferable to reduce the weight, and it is preferably 1 kg or less, more preferably 500 g or less.

Next, the method for closing the drying hole 4 will be described with reference to FIG.
First, the slurry-like mortar 7 is apply | coated around the plug brick 6 (process S1).
Next, a key-type compressed air pipe 9 is inserted into the hole 61 of the plug brick 6, the plug brick 6 is lowered from the coal charging inlet 3 of the coke oven 1, and a cock (not shown) provided at the grip portion of the compressed air pipe 9. By operating, the plug brick 6 is inserted into the drying hole 4 by pressurized air (step S2).
Simultaneously with the insertion, the end of the plug brick 6 is engaged with the recess 51 (step S3).
Finally, the thermal spray material 8 is applied so as to be flush with the wall surface of the carbonization chamber wall 2, and the gap portion of the drying hole 4 is filled (step S4). As the thermal spraying method, both the thermite method and the flame type spraying method can be applied.

In the above-described method for closing the drying hole 4, the plug brick 6 is blown by the pressurized air and inserted into the drying hole 4. However, the present invention is not limited to this, and it may be inserted manually.
Further, in the above-described method for closing the drying hole 4, the sprayed material 8 is finally applied and the gap portion of the drying hole 4 is filled with the sprayed material 8, but the drying hole 4 is not filled with the sprayed material 8. It is possible to occlude. However, at the time of actual operation, when extruding coke distilled in the carbonization chamber, it is preferable to fill with the thermal spray material 8 from the viewpoint of reducing the extrusion resistance.

The schematic diagram showing the structure of the carbonization chamber of the coke oven in which the closing method of the drying hole of the coke oven which concerns on embodiment of this invention is implemented. Sectional drawing showing the obstruction | occlusion structure of the dry hole in the said embodiment. Sectional drawing and the side view showing the structure of the brick for dry holes in the said embodiment. Sectional drawing showing the structure of the brick for dry holes used as the deformation | transformation of the said embodiment. Sectional drawing and the side view showing the structure of the plug brick in the said embodiment. The schematic diagram for demonstrating the process of the closure method of the dry hole in the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Coke oven, 2 ... Carbonization wall, 3 ... Coal inlet, 4 ... Dry hole, 5 ... Dry hole brick, 5A ... Dry hole brick, 6 ... Plug brick, 7 ... Mortar, 8 ... Thermal spray material, DESCRIPTION OF SYMBOLS 9 ... Pressure pipe, 51 ... Recessed part, 52 ... Narrow part, 61 ... Hole, D1 ... Opening diameter, D2 ... Opening diameter, D3 ... Depth dimension, D4 ... Diameter, D5 ... Diameter, L1 ... Thickness dimension, L2: Depth dimension, L3: Height dimension, θ1: Angle

Claims (5)

A method for closing a drying hole of a coke oven, wherein the drying hole of the coke oven is closed with a plug brick,
The drying hole is formed on the inner peripheral surface of the drying hole and the restriction portion that restricts the penetration of the plug brick, and the end of the plug brick is engaged, and is opposite to the restriction direction of the restriction portion. And having a recess to prevent the plug brick from falling off,
Applying mortar to the plug brick outer peripheral surface;
Inserting the plug brick coated with mortar into the drying hole;
And a step of engaging an end portion of the plug brick with the hollow portion. The method for closing a drying hole of a coke oven according to claim 1,
A method for closing a drying hole of a coke oven, wherein a step of filling the drying hole with a thermal spray material after engaging an end of the plug brick with the depression. In the method for closing a drying hole of a coke oven according to claim 1 or claim 2,
The restriction portion has an opening diameter of the opening portion on the combustion chamber side of the coke oven that is smaller than the maximum diameter of the plug brick,
The step of inserting the plug brick into the drying hole includes inserting the plug brick into the drying hole by punching out the plug brick with a pressurized gas. Coke oven wall of the coke oven is configured, and the coke oven drying hole brick is formed,
The drying hole has a regulating portion for regulating the penetration of the stopper brick for closing the drying holes, is formed on the inner peripheral surface of the drying hole, the end portion of the plug bricks engage, the restricting direction of the restricting portion A brick for drying holes in a coke oven , comprising: a depression for preventing the plug brick from falling off in the opposite direction . In the brick for drying holes of the coke oven according to claim 4,
The restricting portion has a tapered cross section in which the opening diameter gradually decreases from one side surface to the other side surface, and the opening diameter of the other side surface is smaller than the maximum diameter of the plug brick. Brick for drying holes in coke ovens.

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