Repair method for coke oven

Abstract

Provided is a repair method for a coke oven that involves repairing the bricks that constitute the walls of a combustion chamber of a coke oven in a hot state such that adjacent combustion chambers and the remaining bricks of an unrepaired portion that has not been dismantled do not protrude toward carbonization chambers after the repair. According to the present invention, a repair method for a coke oven involves repairing the bricks of a combustion chamber of the coke oven by re-laying two or more oven wall bricks and binder bricks along the longitudinal direction of the oven from an oven opening in a hot state. The repair method includes a confirmation step for observing the evenness of the oven walls of combustion chambers adjacent to the combustion chamber to be re-laid from the oven opening using a three-dimensional measurement apparatus and confirming that the protrusion of the oven walls of the adjacent combustion chambers is below a prescribed value and, when it has been confirmed at the confirmation step that the protrusion of the oven walls of the adjacent combustion chambers is below the prescribed value, a re-laying step for dismantling a portion of the oven wall of the combustion chamber to be re-laid that requires repair and laying new oven wall bricks and binder bricks in the dismantled area.

Description

Coke oven repair methods

[0001] The present invention relates to a method for repairing a coke oven in a hot state by replacing oven wall bricks that constitute an oven wall separating a coke oven chamber from a combustion chamber.

[0002] Generally, as shown in FIG. 6 , a chamber-type coke oven has a plurality of carbonization chambers 51 and combustion chambers 52 above a regenerator chamber 53. These carbonization chambers 51 and combustion chambers 52 are alternately formed above the regenerator chamber 53, and a plurality of coal loading ports 54 are opened in the ceiling of each carbonization chamber 51. These coal loading ports 54 are used to load coal carried by a coal loading car 55 traveling above the coke oven into the carbonization chamber 51. The coal loaded into the carbonization chamber 51 through the coal loading port 54 is carbonized by heat from the combustion chamber 52, becoming red-hot coke, which is then pushed out of the carbonization chamber 51 by an extruder 56. The red-hot coke pushed out of the carbonization chamber 51 by the extruder 56 is then transferred to a fire truck 58 via a guide car 57, and transported by the fire truck 58 to a red-hot coke quenching facility (not shown).

[0003] The coking chamber 51, combustion chamber 52, and regenerator 53 are constructed of a large number of bricks, and inside the combustion chamber 52, as shown in Figure 7, a plurality of flues (vertical flame ducts) 59 are formed along a direction (furnace length direction) perpendicular to the arrangement direction of the coking chamber 51 and the combustion chamber 52. The coking chamber 51 also has a kiln opening into which the extrusion ram 56a (see Figure 6) of the extruder 56 is inserted, and a kiln opening from which the red-hot coke is extruded. Backstays 60 (see Figure 7) made of H-shaped steel or the like are erected near these kiln openings to prevent deformation or collapse of the oven walls.

[0004] In such coke ovens, wall-forming bricks that form the walls of the combustion chamber 51 can be significantly worn. Therefore, conventionally, coke ovens have been hot-repaired by replacing significantly worn wall-forming bricks with new bricks (see, for example, Patent Document 1). Various methods for repairing by replacing bricks are known (see Patent Documents 2 to 6).

[0005] Japanese Patent No. 5347614 Japanese Patent No. 6183800 Japanese Patent No. 5991478 Japanese Patent No. 6753389 Japanese Patent No. 5365040 Japanese Patent Application Laid-Open No. 2019-108510

[0006] However, when replacing the bricks in the combustion chamber of a coke oven while it is hot, either by partially replacing a few flue bricks from the kiln mouth or by replacing all the bricks (through replacement), the following problem occurred: the remaining bricks of the adjacent combustion chamber or the unrepaired part that was left undismantled would protrude into the coking chamber after repair.

[0007] The present invention aims to solve the above problems and provide a method for repairing coke ovens, which, when hot repairing the bricks that make up the walls of the combustion chamber of a coke oven, prevents the remaining bricks of the adjacent combustion chamber or the unrepaired parts that remain undismantled from protruding toward the carbonization chamber after repair.

[0008] The coke oven repair method of the present invention is a method for repairing a combustion chamber brick of a coke oven by hot replacing two or more oven wall bricks and binder bricks from the oven mouth along the oven length direction, and is characterized by comprising: a confirmation step of observing the unevenness of the oven wall of a combustion chamber adjacent to the combustion chamber to be replaced using a three-dimensional measuring device from the oven mouth to confirm that the amount of protrusion of the oven wall of the adjacent combustion chamber is less than a predetermined value; and a re-stacking step of dismantling the portion of the oven wall of the combustion chamber to be replaced that needs repair and stacking new oven wall bricks and binder bricks in the dismantled area if it is confirmed in the confirmation step that the amount of protrusion of the oven wall of the adjacent combustion chamber is less than the predetermined value.

[0009] The method for repairing a coke oven according to the present invention, configured as described above, includes: (1) the predetermined value is 40 mm; (2) a repair range determination step for determining the range of oven wall bricks and binder bricks that need repair by observing the unevenness of the oven wall from the oven mouth with a three-dimensional measuring device before dismantling the portion of the combustion chamber to be re-stacked that needs repair; and a step for further checking the convex portions of the oven wall determined in the repair range determination step from the flue hole and dismantling binder bricks up to those that are closer to the oven mouth than the binder bricks determined to be sound; (3) if the range of oven wall bricks and binder bricks that need repair includes a coal loading car rail, a step for reinforcing the rail by providing a gap between the underside of the coal loading car rail support and the ceiling, on which the coal loading car load will not directly act. (4) including a step of maintaining the furnace wall temperature of the combustion chamber adjacent to the combustion chamber to be replaced and the furnace wall temperature of the non-replacement combustion chamber portion of the combustion chamber to be replaced, the binder bricks of which have been confirmed to be sound, at 400°C or higher; (5) including a step of using a pre-formed furnace wall refractory assembly and a pre-formed ceiling refractory assembly as the furnace wall and ceiling to be newly replaced in the combustion chamber to be replaced; (6) The method includes a first new brick laying step of laying one flue worth of first new bricks, i.e., furnace wall bricks and binder bricks, on the surfaces exposed as a result of the brick dismantling of the remaining bricks of the non-repaired portion that has been demolished, i.e., the furnace wall bricks and binder bricks; a heat insulating member attaching step of attaching heat insulating members to the exposed surfaces of the one flue worth of first new bricks, i.e., the furnace wall bricks and binder bricks, laid in the first new brick laying step; and a second new brick laying step of laying second new bricks, i.e., the furnace wall bricks and binder bricks, in the remaining repair range while removing the heat insulating members from the lower parts.(7) A process of forming a joint penetrating vertically at the boundary between the furnace wall portion that has been re-repaired and the furnace wall portion that has not been repaired, and re-stacking the furnace wall bricks; a process of arranging, in the carbonization chamber at and near the boundary, a non-repair side extrusion prevention member that bridges between at least the furnace wall bricks of the non-repaired portion and the furnace wall surface that faces the furnace wall bricks across the space of the carbonization chamber, and a repair side extrusion prevention member that bridges between at least the furnace wall bricks of the furnace wall portion that has been re-repaired and the furnace wall surface that faces the space of the carbonization chamber, and then heating the furnace; and a process of spraying a thermal spray material into the joint that is the gap at the boundary between the bricks of the re-repaired portion and the bricks of the non-repaired portion after the temperature has been raised. (8) It is considered to be a more preferable solution to include the following: a first extrusion prevention member installation process for installing a first extrusion prevention member that maintains the width of the second coking chamber constant at a position that includes at least a position corresponding to the first binder brick from the kiln opening among the multiple binder bricks that form the first adjacent combustion chamber, which is adjacent to the repaired combustion chamber to be repaired in the furnace width direction, and the second adjacent combustion chamber further beyond that; a repair process for dismantling and re-installing the furnace wall bricks and binder bricks of the repaired portion of the repaired combustion chamber; a second extrusion prevention member installation process for installing a second extrusion prevention member that maintains the width of the first coking chamber constant at a position that includes at least a position corresponding to the first binder brick from the kiln opening among the multiple binder bricks that form the repaired combustion chamber; and a heating process for heating the re-installed repaired combustion chamber.

[0010] According to the coke oven repair method of the present invention, by observing the condition of the wall of the adjacent combustion chamber before dismantling the bricks of the combustion chamber to be repaired, it is possible to determine the range of oven wall bricks and binder bricks to be appropriately repaired, thereby solving the problem of the wall of the adjacent combustion chamber protruding into the coke oven chamber after repair.

[0011] FIG. 1 is a diagram for explaining repair when there is no overhang on the furnace wall of an adjacent combustion chamber. FIG. 2 is a diagram for explaining repair when there is no overhang on the furnace wall of an adjacent combustion chamber. FIG. 3 is a diagram for explaining repair when there is no overhang on the furnace wall of an adjacent combustion chamber. FIG. 4 is a diagram for explaining repair when there is an overhang on the furnace wall of an adjacent combustion chamber. FIG. 5 is a diagram for explaining repair when there is an overhang on the furnace wall of an adjacent combustion chamber. FIG. 6 is a diagram for explaining a state in which Example 1 is implemented. FIG. 7 is a diagram for explaining a state in which Example 2 is implemented. FIG. 8 is a diagram for explaining a state in which Example 3 is implemented. FIG. 9 is a diagram for explaining an example of a known coke oven. FIG. 10 is a diagram of a known coke oven viewed from above.

[0012] The following describes in detail the embodiments of the present invention. Note that the following embodiments are merely examples of methods for realizing the technical idea of ​​the present invention, and are not intended to limit the configuration to the following. In other words, the technical idea of ​​the present invention can be modified in various ways within the technical scope described in the claims.

[0013] <Summary of the Invention> The present invention relates to a method for repairing coke ovens and was achieved based on the following findings. Conventional methods for repairing coke ovens have had a problem in that, when repairing a combustion chamber to be repaired, the furnace wall of the combustion chamber adjacent to the combustion chamber to be repaired overhangs the coking chamber. Furthermore, if the adjacent combustion chamber overhangs significantly, it is difficult to properly install the insulation panels, resulting in a drop in the temperature of the adjacent combustion chamber and overhanging into the coking chamber. To solve these problems, before repairing the combustion chamber to be repaired, the condition of the furnace wall of the adjacent combustion chamber is observed, and if the furnace wall of the adjacent combustion chamber satisfies certain conditions, it is determined to be sound. It has been discovered that by repairing the combustion chamber to be repaired when the adjacent combustion chamber is determined to be sound, the furnace wall of the adjacent combustion chamber does not overhang the coking chamber after repair.

[0014] 1A to 1C are diagrams illustrating repairs when there is no overhang on the furnace wall of an adjacent combustion chamber. First, as shown in FIG. 1A, the unevenness of the furnace wall of a combustion chamber adjacent to the combustion chamber to be repaired is observed using a three-dimensional measuring device to confirm that the overhang of the furnace wall is less than a predetermined value. Next, as shown in FIG. 1B, an insulating panel is installed on the surface of the adjacent combustion chamber facing the combustion chamber to be repaired, and the replaced portion of the combustion chamber to be repaired is dismantled. Then, as shown in FIG. 1C, the panel is replaced on the dismantled portion of the combustion chamber to be repaired, and the combustion chamber to be repaired is repaired. At this time, in the adjacent combustion chambers where the overhang of the furnace wall was confirmed to be less than the predetermined value in FIG. 1A, none of the adjacent combustion chambers has any overhang on the furnace wall, as shown in FIG. 1C.

[0015] Figures 2A to 2C are diagrams illustrating repairs when an overhang is found on the furnace wall of an adjacent combustion chamber. First, as shown in Figure 2A, the unevenness of the furnace wall of the combustion chamber adjacent to the combustion chamber to be repaired is observed using a three-dimensional measuring device. Figure 2A shows an example of an observation in which the furnace wall of the combustion chamber adjacent to the upper side of the combustion chamber to be repaired overhangs a predetermined value or more, preferably 40 mm or more, and the furnace wall of the combustion chamber adjacent to the lower side of the combustion chamber to be repaired overhangs less than a predetermined value, preferably less than 40 mm. Next, as shown in Figure 2B, an insulation panel is installed on the surface of the adjacent combustion chamber facing the combustion chamber to be repaired, and the replacement portion of the combustion chamber to be repaired is dismantled. In this case, the overhanging portion of the furnace wall of the upper combustion chamber, which overhangs 40 mm or more, gets in the way of installing the insulation panel. Then, as shown in Figure 2C, the furnace wall is replaced on the dismantled portion of the combustion chamber to be repaired, and the combustion chamber to be repaired is repaired. In this case, in the upper combustion chamber where the furnace wall overhang was confirmed to be 40 mm or more in Fig. 2A, the overhang amount after reassembly was larger than before reassembly, as shown in Fig. 2C. On the other hand, in the lower combustion chamber where the furnace wall overhang was confirmed to be less than 40 mm in Fig. 2A, the overhang amount did not change before and after reassembly, as shown in Fig. 2C.

[0016] The coke oven repair method of the present invention, achieved based on the above findings, is a method for hot repairing a coke oven combustion chamber brick by replacing two or more oven wall bricks and binder bricks from the oven mouth along the oven length, and is characterized by including: a confirmation step of observing the unevenness of the oven wall of a combustion chamber adjacent to the combustion chamber to be replaced using a three-dimensional measuring device from the oven mouth to confirm that the overhang of the oven wall of the adjacent combustion chamber is equal to or less than a predetermined value; and a re-laying step of dismantling the oven wall of the combustion chamber to be replaced that needs repair and laying new oven wall bricks and binder bricks in the dismantled area if it is confirmed in the confirmation step that the overhang of the oven wall of the adjacent combustion chamber is less than the predetermined value. Note that the predetermined value is preferably 40 mm.

[0017] According to the coke oven repair method of the present invention, when the bricks constituting the furnace wall of the combustion chamber of a coke oven are hot repaired, the adjacent combustion chamber furnace wall will no longer protrude toward the carbonization chamber after repair.

[0018] In addition, as a preferred embodiment, the coke oven repair method of the present invention includes a repair range determination step in which, before dismantling the portion of the combustion chamber to be replaced that requires repair, the range of oven wall bricks and binder bricks that require repair is determined by observing the unevenness of the oven wall from the oven mouth using a three-dimensional measuring device, and a step in which the convex portions of the oven wall determined in the repair range determination step are further confirmed from the flue hole, and binder bricks that are closer to the oven mouth than the binder bricks that have been determined to be sound are dismantled up to the binder bricks.

[0019] According to a preferred embodiment of the coke oven repair method of the present invention, when the bricks that make up the furnace wall of the combustion chamber of a coke oven are hot repaired, the remaining bricks in the unrepaired part of the combustion chamber that is not dismantled and remains will not protrude toward the carbonization chamber after repair.

[0020] <Regarding publicly known technologies suitable for use in the coke oven repair method of the present invention> In the coke oven repair method of the present invention described above, a more preferred embodiment is a coke oven repair method using technologies that have already become publicly known in patent publications and published publications, as exemplified below.

[0021] As described in Patent Document 2 (Japanese Patent No. 6183800), the coke oven repair method of the present invention preferably includes a step of reinforcing a coal car rail by providing a gap between the underside of the coal car rail support and the ceiling, so that the coal car load does not directly act on the rail, when the range of oven wall bricks and binder bricks requiring repair includes the coal car rail, thereby reinforcing the rail. According to this embodiment, the coke oven repair method of the present invention can accurately suppress damage to the ceiling on which the coal car rail support is installed (damage and deformation of the ceiling bricks and joints).

[0022] As described in Patent Document 3 (Japanese Patent No. 5,991,478), the coke oven repair method of the present invention preferably includes a step of maintaining the furnace wall temperature of a combustion chamber adjacent to the combustion chamber to be replaced and the furnace wall temperature of a combustion chamber portion of the combustion chamber to be replaced that has been confirmed to have sound binder bricks at 400° C. or higher. According to this embodiment, the coke oven repair method of the present invention can provide a partial coke oven reloading repair method that improves construction efficiency and reduces or eliminates the risk of bulging or falling off.

[0023] As described in Patent Document 4 (Japanese Patent No. 6753389), the coke oven repair method of the present invention preferably includes the following steps: a first new brick laying step of laying one flue of first new bricks, i.e., furnace wall bricks and binder bricks, on surfaces exposed as a result of brick dismantling of the remaining furnace wall bricks and binder bricks in the non-repaired portion after dismantling; an insulating member attaching step of attaching insulating members to the exposed surfaces of the one flue of first new bricks laid in the first new brick laying step; and a second new brick laying step of laying second new bricks, i.e., furnace wall bricks and binder bricks, in the remaining repair area while removing the insulating member from the lower part. According to this embodiment, the coke oven repair method of the present invention can reduce the amount of heat radiation from the surfaces exposed as a result of brick dismantling even in the upper parts of the remaining bricks in the non-repaired portion of the combustion chamber to be repaired, thereby suppressing a temperature drop from the upper to lower parts of the remaining bricks.

[0024] As described in Patent Document 5 (Japanese Patent No. 5,365,040), the coke oven repair method of the present invention preferably includes the steps of: forming vertically penetrating joints at the boundary between the re-repaired oven wall portion and the non-repaired oven wall portion, and re-stacking the oven wall bricks; arranging non-repair-side extrusion prevention members in the coking chamber at the boundary portion and its vicinity, so as to bridge between at least the oven wall bricks of the non-repaired portion and the oven wall surface opposing the oven wall bricks and the oven wall bricks across the space of the coking chamber; and arranging repair-side extrusion prevention members in the coking chamber, so as to bridge between at least the oven wall bricks of the re-repaired oven wall portion and the oven wall bricks and the oven wall surface opposing the oven wall bricks and the space of the coking chamber; and, after the temperature is raised, spraying a thermal spray material into the joints, which are gaps at the boundary between the bricks of the re-repaired portion and the bricks of the non-repaired portion. According to this embodiment, in the coke oven repair method of the present invention, it is possible to minimize the protrusion of the boundary between the repaired and non-repaired parts when the temperature of the coke oven oven wall bricks is raised again, and deformation of the oven wall bricks during hot repair can be suppressed.

[0025] In the method for repairing a coke oven of the present invention, as described in Patent Document 6 (JP 2019-108510 A), a first push-out prevention member is installed in a second coking chamber between a first adjacent combustion chamber adjacent to the repair combustion chamber in the oven width direction and a second adjacent combustion chamber further beyond the first adjacent combustion chamber, at a position including at least a position corresponding to the first binder brick from the oven mouth among a plurality of binder bricks forming the first adjacent combustion chamber. The first push-out prevention member keeps the width of the second coking chamber constant at that position. and a heating step of heating the replaced repaired combustion chamber. According to this embodiment, the method for repairing a coke oven of the present invention can appropriately prevent the furnace wall bricks of the repaired combustion chamber and the first adjacent combustion chamber from being extruded when repairing the furnace wall bricks and partition bricks near the combustion chamber mouth.

[0026] Example 1 As shown in Figure 3, for a combustion chamber to be repaired and two combustion chambers adjacent to the combustion chamber to be repaired that constitute a coke oven, the unevenness of the furnace walls was measured using a laser scanner at predetermined positions on the kiln mouth bricks of the adjacent combustion chambers before and after they were re-laid on the combustion chamber to be repaired. In addition, before the combustion chamber to be repaired was re-laid, the presence or absence of cracks was observed through the flue hole. The results are shown in Table 1 below.

[0027]

[0028] The results in Table 1 show that if the kiln mouth overhang of the adjacent combustion chamber before re-stacking is +40 mm, this will be exacerbated after re-stacking, so the kiln mouth overhang of the adjacent combustion chamber before re-stacking must be less than +40 mm. Furthermore, if the overhang is ≦15 mm, there will be almost no change after re-stacking (within the measurement error range). Furthermore, it can be seen that there is a correlation between the size of the kiln mouth overhang and the presence or absence of brick cracks from inside the flue hole.

[0029] Example 2 As shown in Figure 4, in an example in which kiln-mouth extension-preventing bricks were placed between a combustion chamber to be repaired and two combustion chambers adjacent to the combustion chamber to be repaired, the unevenness of the oven wall was measured using a laser scanner at predetermined positions on the kiln-mouth bricks of the adjacent combustion chambers before and after the combustion chamber to be repaired was replaced. In addition, before the combustion chamber to be repaired was replaced, the presence or absence of cracks was observed through the flue hole. The results are shown in Table 2 below.

[0030]

[0031] The results in Table 2 show that installing anti-bulge bricks at the kiln mouth suppresses bulging after reloading. However, if the amount of bulging is +40 mm, it is difficult to suppress further bulging even with the anti-bulge bricks.

[0032] Example 3 As shown in Figure 5, a case was investigated in which a combustion chamber was to be replaced (repaired) and a portion of the combustion chamber was left intact. For this example, kiln-mouth extension prevention bricks were placed between the combustion chamber to be partially repaired and the two combustion chambers adjacent to the combustion chamber to be repaired. Before and after the replacement of the combustion chamber to be repaired, a laser scanner was used to measure the irregularities of the oven wall at predetermined positions on the kiln-mouth bricks of the adjacent combustion chambers. Furthermore, before the replacement of the combustion chamber to be repaired, the presence or absence of cracks was observed through the flue hole. The results are shown in Table 3 below.

[0033]

[0034] The results in Table 3 show that if there are cracks in the remaining combustion chamber (old bricks), the furnace wall will protrude after replacement (even if that part is not protruding).The above results also show that it is difficult to prevent this, regardless of whether or not protrusion prevention bricks are installed.

[0035] In the coke oven repair method of the present invention, the range of oven wall bricks and binder bricks to be appropriately repaired can be determined by observing the condition of the wall of the adjacent combustion chamber before dismantling the bricks of the combustion chamber to be repaired. This solves the problem of the wall of the adjacent combustion chamber protruding into the coke chamber after repair, and is therefore industrially useful.

[0036] 51 carbonization chamber 52 combustion chamber 53 regenerator 54 coal loading port 55 coal loading car 56 pusher 56a push ram 57 guide car 58 fire extinguishing car 59 flue (vertical flame passage) 60 backstay

Claims

1. A method of repairing a coke oven in which two or more oven wall bricks and binder bricks are hot replaced from the oven mouth along the oven length, the method comprising: a confirmation step of observing the unevenness of the oven wall of a combustion chamber adjacent to the combustion chamber to be replaced with a three-dimensional measuring device from the oven mouth to confirm that the amount of protrusion of the oven wall of the adjacent combustion chamber is less than a predetermined value; and a re-installation step of dismantling the portion of the oven wall of the combustion chamber to be replaced that needs repair, and stacking new oven wall bricks and binder bricks in the dismantled area, when it is confirmed in the confirmation step that the amount of protrusion of the oven wall of the adjacent combustion chamber is less than a predetermined value.

2. The method for repairing a coke oven as set forth in claim 1, wherein said predetermined value is 40 mm.

3. A method for repairing a coke oven as described in claim 1, comprising: a repair range determination step of determining the range of oven wall bricks and binder bricks requiring repair by observing the unevenness of the oven wall from the oven mouth with a three-dimensional measuring device before dismantling the portion of the combustion chamber to be replaced that requires repair; and a step of further checking the convex portions of the oven wall determined in the repair range determination step from the flue hole, and dismantling binder bricks up to and including the binder bricks that are closer to the oven mouth than the binder bricks determined to be sound.

4. A method for repairing a coke oven as described in any one of claims 1 to 3, characterized in that if the range of oven wall bricks and binder bricks requiring repair includes a coal car rail, a step of reinforcing the rail by providing a gap between the underside of the coal car rail support base and the ceiling, so that the load of the coal car does not directly act on the rail.

5. A method for repairing a coke oven as described in any one of claims 1 to 3, comprising a step of maintaining the oven wall temperature of a combustion chamber adjacent to the combustion chamber to be replaced, and the oven wall temperature of a non-replacement combustion chamber portion of the combustion chamber to be replaced in which the binder bricks have been confirmed to be sound, at 400°C or higher.

6. A method for repairing a coke oven according to any one of claims 1 to 3, comprising: a first new brick laying step of laying one flue of first new bricks, i.e., furnace wall bricks and binder bricks, on surfaces exposed as a result of the dismantling of the remaining bricks of the non-repaired portion after dismantling; a heat insulating material attaching step of attaching heat insulating material to the exposed surfaces of the furnace wall bricks and binder bricks, i.e., one flue of first new bricks laid in the first new brick laying step; and a second new brick laying step of laying second new bricks, i.e., furnace wall bricks and binder bricks, in the remaining repair area while removing the heat insulating material from the lower part.

7. A method for repairing a coke oven according to any one of claims 1 to 3, comprising the steps of: forming a joint that penetrates vertically at the boundary between the oven wall portion that has been re-repaired and the oven wall portion that has not been repaired, and re-laying the oven wall bricks; arranging in the coking chamber, at the boundary portion and its vicinity, a non-repair side anti-pushing member that spans between at least the oven wall bricks of the non-repaired portion and the oven wall surface facing the oven wall bricks and the space of the coking chamber, and a repair side anti-pushing member that spans between at least the oven wall bricks of the oven wall portion that has been re-repaired and the oven wall surface facing the oven wall bricks and the space of the coking chamber, and then heating the oven; and after heating, spraying a thermal spray material into the joint that is the gap at the boundary between the bricks of the re-repaired portion and the bricks of the non-repaired portion.

8. A first extrusion prevention member installation process for installing a first extrusion prevention member that maintains the width of the second coking chamber constant at a position including at least a position corresponding to the first binder brick from the kiln mouth among the multiple binder bricks that form the first adjacent combustion chamber, in a second coking chamber between the first adjacent combustion chamber to be repaired and the second adjacent combustion chamber beyond that; a repair process for dismantling and re-installing the furnace wall bricks and binder bricks of the repaired portion of the repair combustion chamber; a second extrusion prevention member installation process for installing a second extrusion prevention member that maintains the width of the first coking chamber constant at a position including at least a position corresponding to the first binder brick from the kiln mouth among the multiple binder bricks that form the repair combustion chamber, in the first coking chamber between the replaced repair combustion chamber and the first adjacent combustion chamber; and a heating process for heating the replaced repair combustion chamber. The method for repairing a coke oven according to any one of claims 1 to 3, comprising:

Images