JP5206079B2 - Coke oven drying stopper - Google Patents

Description

  More particularly, the present invention relates to a drying plug that prevents the falling of the plug brick from the furnace wall.

  The coke oven furnace body equipment has a heat storage chamber in the lower part of the furnace body, and has a structure in which carbonization chambers and combustion chambers are alternately arranged in the upper part. Coking of coal charged in the carbonization chambers arranged adjacent to each other is performed.

  The furnace equipment of such a coke oven is constructed by refractory brickwork, but the furnace body after the construction is in a moist state due to moisture contained in the refractory brick itself and joint mortar. It is necessary to dry the furnace body before the start of actual operation, so-called burning.

  Up to now, as a technique related to furnace body drying after the construction of a furnace, for example, a furnace body of an industrial furnace constructed with refractory bricks used in steelmaking, steelmaking, chemical industry, ceramic industry, etc., using combustion gas When drying, a method of measuring the temperature of the furnace wall portion and determining the degree of dryness of the furnace body after building (see, for example, Patent Document 1), as a furnace body drying method of a blast furnace, When drying the furnace brick by blowing hot air from the mouth, the drying temperature of the bricks dried by the hot air blown from the drying nozzle is detected by the multiple temperature sensors installed on the furnace brick. There has been proposed a method for drying a blast furnace brick in which the amount of hot air of the drying nozzle is adjusted by a hot air control valve attached to each hot air supply pipe so as to be uniform (see, for example, Patent Document 2). .

  The furnace bodies shown in these prior arts have a simple furnace body structure as compared with a coke oven, and there is no need to take special measures for ventilation of combustion gas for drying the furnace body.

  However, since the furnace body of the coke oven has a furnace body structure that is divided into a plurality of furnace chambers, in order to dry the furnace body after the brick building of the coke oven, COG (coke oven gas is used in the carbonization chamber. ) Or burning light oil, etc., and the flue gas needs to be led to the entire furnace body such as the combustion chamber, bellows, heat storage chamber, horizontal flue, etc., discharged to the atmosphere from the flue / chimney, and dried in the furnace body Become.

  The furnace wall that separates the carbonization chamber and the combustion chamber of the coke oven is installed with dowels etc. on the end face of the furnace wall brick corresponding to the joint, and the airtightness in the furnace operation is maintained. Only during the drying period, a drying hole for introducing the combustion exhaust gas from the carbonization chamber to the combustion chamber is provided. The number of drying holes is, for example, 20 to 40 pieces / kiln, and the whole furnace is installed in an extremely large amount of about 2,000 pieces. This drying hole is provided in the dry plug receiving brick, and the plug brick is inserted into the drying hole at the time of regular heating when the drying is finished (plugging work), and the drying hole is plugged with the plug brick permanently. Blocked.

  Conventional plug bricks have a mere conical shape, and in many years of operation of the furnace, the plug bricks have fallen from the dry receiving bricks, or have not dropped off, but have been formed in the carbonization chamber from the carbonization chamber side to the combustion chamber side. There was a problem that gas from coal dry distillation gas occurred and black smoke was coming out of the chimney.

  Various technologies related to the start-up of coke ovens have been proposed (for example, see Patent Documents 3 and 4), but those related to high-density silica bricks for coke ovens and technologies for preventing explosions in dry mains. In fact, no technology has been proposed for furnace body drying at the time of firing in the coke oven furnace equipment.

JP-A-1-273990 JP-A-7-173514 JP 11-116324 A JP 2007-45929 A

  Accordingly, in view of the above problems, the present invention provides a drying plug composed of a coke oven drying receiving brick and a plug brick, and the first object is that the plug brick is dropped in the coke oven operation and is generated in the carbonization chamber. Black smoke flows into the combustion chamber and is dissipated from the chimney and causes air pollution. This is not preferable, so the plug brick is prevented from falling off. The second purpose is to provide, for example, 20 to 40 dry plugs. There are a lot of kilns, and if it takes too much time for the plugging operation at the end of the furnace drying period, the kiln is opened for a long time and the furnace body is cooled too much, which is not preferable. Furthermore, there are many plug bricks, for example, about 2,000 pieces in the whole furnace, and if the plugging work is difficult, a lot of labor is required, which is not preferable. The third object is to plug the gas tightly and maintain the airtightness. If the sealing property is not sufficient, the carbonization gas generated in the carbonization chamber leaks from the carbonization chamber and leaks from the chimney. This is a cause of occurrence, and is to maintain the sealing effect.

  In order to solve the above-mentioned problems, the present inventor has intensively studied the drying plug of the coke oven, focusing on the shape of the plug brick and the shape of the drying plug receiving brick. As a result, by installing a mortar pool space in the middle part of the dry plug with the plug brick inserted into the dry plug receiving brick, the mortar pool mortar solidifies and acts as a seal, and prevents the plug brick from falling off. The present invention has been completed by finding that it has an effect.

  The gist of the present invention is as follows.

( 1 ) In a drying plug of a coke oven comprising a drying plug receiving brick and a plug brick arranged on the partition wall between the carbonization chamber and the combustion chamber of the coke oven, the drying plug receiving brick is plugged with the plug brick. The drying hole is a drying hole that communicates the carbonization chamber and the combustion chamber, and has a tapered cylindrical shape in which the diameter on the carbonization chamber side is larger than the diameter on the combustion chamber side. The plug brick to be inserted into the drying hole of the drying receiving brick is a tapered cylindrical body shape having a diameter on the carbonization chamber side larger than the diameter on the combustion chamber side. A coke oven drying plug, characterized in that it is a plug brick in which a recess for a mortar storage space is formed in the middle.

( 2 ) The drying plug of the coke oven according to the above (1), wherein the drying hole of the plug receiving brick is a drying hole longer by 20 mm or more than the length of the plug brick.

( 3 ) The drying hole of the plug receiving brick has a cylindrical shape with the same diameter larger than the tip diameter of the plug brick between the tip end surface of the plug brick and the combustion chamber side end surface of the plug receiving brick with the plug brick inserted. The coke oven drying plug according to (1) or (2) above, which has a shape in which a cavity is formed.

( 4 ) The drying hole of the plug receiving brick has a cylindrical shape with the same diameter smaller than the tip diameter of the plug brick between the tip end surface of the plug brick and the combustion chamber side end surface of the plug receiving brick with the plug brick inserted. The coke oven drying plug according to any one of the above (1) to ( 3 ), wherein the stopper is formed at the tip of the plug brick.

( 5 ) The cross-sectional shape of the longitudinal space of the mortar reservoir formed by the plug receiving brick and the plug brick is any one of a square shape, a rhombus shape, an elliptical shape, and a circular shape. The drying plug of the coke oven according to any one of (1) to ( 4 ) above.

( 6 ) The drying plug for the coke oven according to any one of (1) to ( 5 ), wherein a gap serving as a joint between the plug receiving brick and the plug brick is 3 to 8 mm.

  Conventionally, there are about 2,000 drying plugs in the coke oven / the entire kiln, and there is always about 10 pieces / year of falling off the plug bricks, but according to the present invention, the plug bricks are dropped off. The sealing with plug bricks has been improved, and the generation of black smoke has been eliminated, improving the environment, improving productivity, and extending the life of the coke oven. In addition, the plug brick has a conical shape, and the weight of the plug brick has been reduced by installing a mortar storage space, so that the plug brick can be easily plugged. As a result, the carbonization chamber was not opened for a long time, and the carbonization chamber was not overcooled. Furthermore, it has a remarkable effect that the labor of the plugging operation is reduced.

  The furnace body equipment of the coke oven has a heat storage chamber at the lower part of the furnace body, and has a structure in which combustion chambers and carbonization chambers are alternately arranged at the upper part. By burning fuel in the combustion chamber, the combustion chamber The coal charged in the carbonization chambers arranged adjacent to is coked. The combustion exhaust gas burned in the combustion chamber is discharged from the chimney to the atmosphere through the bellows, the heat storage chamber, and the flue. The carbonization chamber is isolated from the combustion gas passage. In such a coke oven furnace body equipment, quartz bricks that have high mechanical strength at high temperatures, little volume change at high temperatures, and relatively good thermal conductivity are mainly used. Clay brick is used at the top of the furnace where there is a lot of heat.

  The furnace body equipment of the coke oven is constructed by refractory bricks such as silica brick and clay brick, but the furnace body after the construction is included in the refractory brick itself or the mortar of the brick joint (joint). It is necessary to dry the furnace body prior to the start of the furnace operation, so-called firing. In order to dry the furnace body, COG (coke oven gas) or light oil is burned in the carbonization chamber only during the drying period, and the combustion exhaust gas for drying is led from the carbonization chamber to the combustion chamber, and the combustion gas is burned throughout the furnace. Do it by ventilating. However, the furnace wall that separates the carbonization chamber and combustion chamber of the coke oven is installed with dowels etc. on the end face of the furnace wall brick corresponding to the joint, and the airtightness in the furnace operation is maintained. If there is no vent hole in the carbonization chamber and the combustion chamber, the combustion gas for drying is led from the carbonization chamber to the combustion chamber, and the furnace body is dried by ventilating the combustion gas for drying throughout the furnace. I can't.

  FIG. 1 is a partial cross-sectional view of a coke oven in a coke oven and a combustion chamber in the furnace group length direction (direction in which coke is pushed out by a pusher).

  In order to allow the combustion chamber and the combustion chamber to communicate with each other for the ventilation of the combustion exhaust gas when the furnace body is dried, as shown in FIG. 1, a furnace that is bricked on the heat storage chamber and separates the carbonization chamber 1 and the combustion chamber 2. A drying stopper receiving brick 4 having a drying hole 3 is installed in the upper part of the wall, and the carbonization chamber 1 and the combustion chamber 2 are communicated with each other. The combustion gas for drying burned in the carbonization chamber 1 is guided to the combustion chamber 2 through the drying hole 3 of the drying plug receiving brick 4.

  After drying the furnace body, plugging work is performed in which the plug brick is inserted into the drying hole 3 of the drying plug receiving brick 4 to close the drying hole 3. The plugging operation for closing the drying hole 3 is, for example, mounting a plug brick at the tip of the plugging jig, and a rod-shaped plugging jig from the coal inlet 6 provided above the furnace top 5 of the carbonization chamber. Is inserted, the plug brick is inserted into the drying hole of the drying plug receiving brick, plugged, and the drying hole is closed. The outer surface of the plug brick is coated with mortar, the joint between the plug brick and the dry plug receiving brick is joined with no gap between the mortar, the drying hole is closed with the plug brick, and the plug brick is dried. It is designed not to fall off from the stopper receiving brick. About 20 to 40 drying plugs are installed in one kiln, and if the plugging operation takes too long, the kiln is opened for a long time and the furnace body is cooled too much, which is not preferable. Furthermore, there are about 2,000 plug bricks in the whole furnace, and there is a problem that much labor is required if the plugging work is difficult.

  The conventional drying plug has a simple conical shape, and during many years of coke oven operation, the plug bricks dropped off, and the coal dry distillation gas generated in the carbonization chamber leaked into the combustion chamber, resulting in the generation of black smoke from the chimney. There was a problem of frequent occurrence. Such omission of plug bricks was always dropped about 10 pieces / year based on the number of plug bricks in the whole coke oven.

  The present inventors have investigated the problem of falling off the plug brick. The drop off of the plug brick is because the dry plug is installed at a position below the coal charge level 7, so that the plug brick is mainly dropped. The coke and plug bricks produced by dry distillation are fixed, and the plug bricks fall out from the drying holes of the dry plug receiving bricks when the coke is discharged from the kiln, and there is a problem with the shape of the plug brick and the dry plug receiving brick. I found out.

Accordingly, the present inventors have intensively studied the shape of the dry plug receiving brick and the plug brick shape so that the plug brick does not fall off. As a result, (1) the shape of the drying plug receiving brick is a tapered hole shape in which the diameter of the carbonization chamber side is larger than the diameter of the combustion chamber side, and a mortar pool is formed in the middle. The plug brick shape is a tapered columnar shape whose diameter on the carbonization chamber side is larger than the diameter on the combustion chamber side, or (2) the shape of the dry plug receiving brick is plug brick The shape of the drying hole to be received is a tapered cylindrical shape whose diameter on the carbonization chamber side is larger than the diameter on the combustion chamber side, while the plug brick shape is a tapered cylinder shape whose diameter on the carbonization chamber side is larger than the diameter on the combustion chamber side. And a recess that can form a mortar pool space is formed in the middle part, or (3) the shape of the drying plug receiving brick is the shape of the drying hole that receives the plug brick, and the diameter on the carbonization chamber side is the diameter on the combustion chamber side A larger tapered cylindrical shape with a module in the middle On the other hand, the plug brick shape has a tapered cylindrical shape whose diameter on the carbonization chamber side is larger than the diameter on the combustion chamber side, and a recess that can form a mortar pool space in the middle. By forming it, it was set as the structure which can form a mortar pool between dry plug receiving brick and plug brick.
Furthermore, the drying hole of the plug receiving brick has a shape in which a cavity is formed between the tip of the plug brick and the combustion chamber side in a state of being inserted into the drying hole. And this cavity can be formed by making the length of the dry plug receiving brick 20 mm or more longer than the length of the plug brick. In this way, by using a dry stopper having a mortar reservoir space in the middle, the mortar solidified in the mortar reservoir performs a sealing function of the combustion exhaust gas, and the plug brick falls off from the dry plug receiver brick by the wedge action. Can be prevented. Then, it was found that by providing a hollow portion at the tip of the plug brick, the mortar that protruded during the plugging operation can be retained at this portion, and the protruding mortar does not fall to the lower part of the combustion chamber.

  The installation position of the drying plug is not limited to the lower side than the coal charging level, and may be provided above the coal charging level. When the drying plug is provided above the coal charge level, the possibility of dropping off at the time of coke extrusion due to adhesion of the coke and the drying plug is reduced.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  2A and 2B are schematic diagrams showing the shape of a conventional plug brick and the shape of a dry plug receiving brick, wherein FIG. 2A is a diagram showing before plugging, and FIG. 2B is a diagram showing after the plugging operation is completed.

  As shown in FIG. 2 (a), the shape of the conventional drying plug receiving brick and the plug brick is provided with a drying hole 3 in the drying plug receiving brick 4 for communicating the carbonization chamber and the combustion chamber. The drying hole 3 is a tapered cylindrical drying hole whose inner diameter (d1) on the carbonization chamber side is slightly larger than the inner diameter (d2) on the combustion chamber side. On the other hand, the plug brick 8 has a tapered cylindrical shape in which the outer diameter (d3) on the carbonization chamber side is slightly larger than the outer diameter (d4) on the combustion chamber side so that the plug brick 8 can be fitted into the drying hole 3 having a tapered cylindrical shape. It has become.

  In order to attach the plug brick 8 to the drying hole 3 of the dry plug receiving brick 4, as shown in FIG. 2 (b), mortar is applied to the outer peripheral surface of the plug brick 8, and the plug brick is inserted into the drying hole. It fixes to a dry hole with a mortar, and a dry hole is obstruct | occluded permanently.

  However, with such a combination of drying plug receiving bricks and plug bricks, when the charged coal is coke during operation of the coke oven, the coke and the plug brick are fixed, and when the coke is discharged from the kiln. The plug brick inserted into the drying hole is pushed out together with the coke and falls off, and the dry distillation gas leaks from the carbonization chamber into the combustion chamber and black smoke is generated from the chimney, or falls into the combustion chamber due to coke pressure. It was found that it was not preferable because it could fall and block the combustion duct.

  Therefore, in the present invention, the shape of the drying hole of the drying plug receiving brick is such that the plug brick is firmly joined to the drying plug receiving brick and is not easily detached from the drying plug receiving brick during the coke oven operation and can maintain airtightness. And the shape of the plug brick was devised.

  FIG. 3 is a schematic diagram showing the shape of the plug brick and the shape of the dry plug receiving brick according to the present invention, and (a), (b) and (c) are diagrams showing different examples before plugging. FIG. 4 is a view showing the end of the clogging operation for clogging the dry plug receiving brick of FIG.

  As shown in FIG. 3A, the drying stopper receiving brick 4 constituting the drying stopper is provided with a drying hole 3 that allows the carbonization chamber and the combustion chamber to communicate with each other. The hole size of the drying hole 3 is, for example, about 80 mm to 90 mm, the carbonization chamber inlet side 9 is made larger, and the combustion chamber flue hole side 10 is made slightly smaller so that the drying plug 8 can be easily inserted. It is. That is, the drying hole 3 is a tapered cylindrically shaped drying hole in which the hole inner diameter (D1) on the carbonization chamber side is larger than the hole inner diameter (D2) on the combustion chamber side, and an intermediate portion of the drying hole 3 It has the shape which has the convex part 11 space used as mortar accumulation space.

  The shape of the convex 11 space serving as a mortar reservoir may be any shape such as a substantially square shape, a substantially triangular shape, a substantially semi-elliptical shape or a substantially semi-circular shape in cross section in the longitudinal direction space. As shown in FIG. 3A, it is preferable to have a substantially semi-elliptical cross section (half tear shape). In the case of a cross-sectional shape having a corner in the space portion of the mortar reservoir, it is preferable to provide a round at the corner portion because the corner portion causes a crack.

  Further, it is preferable that the length of the drying hole 3 of the drying plug receiving brick 4 is longer than the length of the plug brick 8 by 20 mm or more. By doing so, the mortar that protrudes in the plugging operation can be retained in the hollow portion of the drying hole 3. If it does not exist, the mortar that protrudes falls to the lower part of the combustion chamber and may block the gas duct hole, which is not preferable. Therefore, in the present invention, the length of the drying hole 3 of the drying plug receiving brick 4 is set to 20 mm or more longer than the length of the plug brick, but preferably 50 mm or more. The upper limit of the length is not particularly limited, but is limited by the thickness of the partition wall and the length of the plug brick 8 and is preferably 100 mm or less.

  And the shape of the cavity of the drying hole 3 formed between the front end end surface of the plug brick 8 and the combustion chamber side end surface of the dry plug receiver brick 4 in a state where the plug brick 8 is inserted into the dry plug receiver brick 4 is shown in FIG. As shown in FIG. 3 (b), it may have a cylindrical shape with an inner diameter (D3) larger than the tip diameter (D5) of the plug brick 8 so as to increase the ventilation amount of the combustion gas when drying after the building. Alternatively, as shown in FIG. 3 (c), the plug brick 8 has a cylindrical shape having an inner diameter (D4) smaller than the tip diameter (D5) of the plug brick 8 so that the plug brick 8 does not fall out to the combustion chamber side. It is good also as a dry hole which formed the stopper part 12 which prevents omission to the combustion chamber side.

  In addition, as a material of the drying stopper receiving brick 4, it is preferable to use the quartz brick of the same material as a furnace wall.

  On the other hand, the plug brick 8 has a tapered cylindrical shape so that it can be fitted into the drying hole 3, and is a cross section symmetrical to the cross-sectional shape of the mortar storage space of the dry plug receiving brick at the middle part of the plug brick 8. A concave portion 18 of a shaped mortar reservoir space is formed. The plug brick has a tapered cylindrical shape with a thin tip and a thick base, and is provided with a recess 18 serving as a mortar storage space, so that the weight is reduced and the plugging operation is facilitated. The plug brick 8 is preferably provided with a jig hole 14 into which a plugging jig can be inserted at the base of the plug brick 8 in order to plug the plug brick 8 into the dry plug receiving brick 4. If clay brick is used as the material of the plug brick 8, cracking can be prevented.

  The drying plug receiving brick 4 is arranged on the furnace wall that partitions the carbonization chamber and the combustion chamber, and the drying hole 3 communicates the carbonization chamber and the combustion chamber. After the coke oven is built, COG or light oil is burned in the carbonization chamber, and the combustion exhaust gas is led to the combustion chamber, bellows, heat storage chamber, and horizontal flue, and then released from the chimney through the flue. Dry the furnace body.

  When the furnace temperature of the coke oven is raised to a predetermined temperature, regular heating is performed. At this time, the plug brick 8 is inserted into the furnace body drying hole 3 from the carbonization chamber side, and plugging work is performed to dry the hole. 3 is permanently occluded.

FIG. 4 is a view showing a state in which the plug brick 8 is plugged into the dry plug receiving brick 4 of FIG.
For plugging work, mortar is applied to the outer peripheral surface of the plug brick, for example, the L-shaped tip of a long rod-like plugging jig is inserted into the hole 14 for the plug brick jig, and plugged into the plugging jig. Install brick 8. Next, the plugging jig is inserted into the carbonization chamber from the coal charging inlet, and the plug brick 8 is inserted into the drying hole 3 of the dry plug receiving brick 4. As shown in FIG. 4, the plug brick 8 is mounted in the drying hole 3, and the mortar plugs the gap between the plug brick 8 and the plug brick receiving brick 4. The joint size between the dry plug receiving brick 4 and the plug brick 8 is preferably about 3 to 8 mm. If the joint is too large exceeding 8 mm, the joint becomes loose and the plug brick 8 is likely to fall off. Conversely, it is too small, less than 3 mm, and the dimensional difference between the plug brick 8 and the dry plug receiving brick 4 is small. Therefore, the plugging operation becomes difficult. Therefore, a suitable joint size is about 3 to 8 mm.

  In addition, since the length of the dry plug receiving brick 4 is at least 20 mm longer than the length of the plug brick 8, the mortar that protrudes in the plugging operation is placed in the dry hole 3 (cavity) at the tip of the plug brick 8. The mortar will not fall to the bottom of the combustion chamber.

  In the present invention, since the space of the mortar reservoir 15 is formed between the dry stopper receiving brick 4 and the stopper brick 8, the mortar (shown in black) is accumulated in the mortar reservoir 15 space having a tear-shaped cross section. Airtightness can be ensured. As the longitudinal space of the mortar reservoir, the cross-sectional shape is preferably any one of a square shape such as a quadrangle and a hexagon, an elliptical shape such as a rhombus shape and a teardrop shape, and a circular shape. Further, after the mortar is dried, it is possible to prevent the plug brick 8 from falling off due to the wedge effect of the mortar solidified in the space of the mortar reservoir such as a tear-shaped cross section. Gas leakage from the chamber to the carbonization chamber can be prevented.

  And as a dimension of the cross-sectional shape of the mortar reservoir space, although depending on the size of the drying plug 8, for example, the maximum height above and below the cross-sectional shape of the mortar reservoir space may be about 8 to 30 mm, preferably 8 ~ 20 mm. That is, when the maximum height is less than 8 mm, the wedge effect and the sealing effect of the solidified mortar cannot be sufficiently obtained. On the other hand, when it exceeds 30 mm, it is difficult to sufficiently fill the mortar storage space with the mortar. It is.

  As described above in detail, according to the drying plug of the present invention, the plug brick 8 attached to the drying plug receiving brick 4 is not dropped, and the sealing by the plug brick 8 is also good. Furthermore, the plugging work of mounting the plug brick 8 on the dry plug receiving brick 4 is facilitated.

It is a fragmentary sectional view of the coking oven carbonization chamber and combustion chamber in the furnace length direction (direction in which coke is pushed out by a pusher). It is a schematic diagram which shows the shape of the conventional plug brick shape and the shape of a dry plug receiving brick, (a) is a figure which shows before plugging, (b) is a figure which shows after completion | finish of plugging work. It is a schematic diagram which shows the shape of the plug brick of this invention, and the shape of a dry plug receiving brick, (a), (b) and (c) are figures which show the different example before plugging. It is a figure which shows the state which plugged the plug brick in the dry plug receiving brick of FIG.3 (b).

Explanation of symbols

1 Carbonization chamber 2 Combustion chamber 3 Drying hole 4 Drying plug receiving brick 5 Furnace top 6 Coal inlet 7 Coal charging level 8 Plug brick 9 Loading side 10 Flue hole side 11 Convex part 12 Stopper part 13 Concave part 14 Jig hole

Claims (6)

  In the drying plug of the coke oven, which is composed of a drying plug receiving brick and a plug brick arranged on the partition wall between the carbonization chamber and the combustion chamber of the coke oven, the drying plug receiving brick has a drying hole to be plugged with the plug brick. The drying hole communicates between the carbonization chamber and the combustion chamber, and has a tapered cylindrical shape in which the diameter on the carbonization chamber side is larger than the diameter on the combustion chamber side. The plug brick to be inserted into the drying hole of the drying receiving brick has a tapered cylindrical shape whose diameter on the carbonization chamber side is larger than the diameter on the combustion chamber side, and is formed in the middle portion. Coke oven drying plug, characterized in that it is a plug brick formed with a recess for a mortar reservoir space. The drying plug of the coke oven according to claim 1, wherein the drying hole of the drying plug receiving brick is a drying hole longer by 20 mm or more than the length of the plug brick. In the drying hole of the plug receiving brick, a cylindrical cavity having the same diameter larger than the tip diameter of the plug brick is formed between the tip end surface of the plug brick and the combustion chamber side end surface of the plug receiving brick with the plug brick inserted. The drying plug for a coke oven according to claim 1 or 2 , wherein the drying plug has a shape to be formed. The drying hole of the plug receiving brick has a cylindrical cavity of the same diameter smaller than the tip diameter of the plug brick between the tip end surface of the plug brick and the combustion chamber side end surface of the plug receiving brick with the plug brick inserted. The coke oven drying plug according to any one of claims 1 to 3 , wherein the stopper is formed at a tip of the plug brick. The cross-sectional shape of the longitudinal space of the mortar reservoir formed by the plug receiving brick and the plug brick is any one of a square shape, a rhombus shape, an elliptical shape, and a circular shape. The drying stopper of the coke oven according to any one of 1 to 4 . The coke oven drying plug according to any one of claims 1 to 5 , wherein a gap serving as a joint between the plug receiving brick and the plug brick is 3 to 8 mm.

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