Coke oven repair methods

Abstract

Provided is a coke oven repairing method for repairing bricks of one combustion chamber or bricks of a plurality of continuous combustion chambers forming a coke oven by relaying two or more furnace wall bricks and binder bricks at high temperatures along the furnace length direction from a furnace opening, the coke oven repairing method comprising: a confirmation step for observing, from the furnace opening using a three-dimensional measuring instrument, irregularities of furnace walls of an adjacent non-relaying combustion chamber located adjacent to one side surface of one relaying combustion chamber or a plurality of continuous relaying combustion chambers and irregularities of furnace walls of an adjacent non-relaying combustion chamber located adjacent to a side surface opposite to the one side surface, and thus confirming whether or not the protrusion amount is less than a predetermined value for each of the furnace walls of the adjacent non-relaying combustion chambers; and a relaying step for dismantling, if the protrusion amount of any of the furnace walls of the non-relaying combustion chambers is confirmed to be less than the predetermined value in the confirmation step, a repair-needed site of the furnace walls of the one relaying combustion chamber or the plurality of continuous relaying combustion chambers, and newly laying furnace wall bricks and binder bricks in the dismantled range.

Description

[Technical Field]

[0001] The present invention relates to a method for repairing a coke oven, which involves replacing the furnace wall bricks that make up the furnace wall separating the carbonization chamber and the combustion chamber, thereby repairing the coke oven while it is still hot. [Background technology]

[0002] Generally, as shown in Figure 7, a chamber-type coke oven has carbonization chambers 51 and combustion chambers 52 arranged alternately above a heat storage chamber 53, forming a furnace cluster of a certain number of units. Multiple coal charging ports 54 are provided in the ceiling of each carbonization chamber 51. These coal charging ports 54 are for charging coal, which is transported by a coal charging car 55 that runs on top of the coke oven, into the carbonization chamber 51. The coal charged into the carbonization chamber 51 from the coal charging ports 54 is heated by the combustion chamber 52 and undergoes carbonization, 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 handed over to a fire extinguishing car 58 via a guide car 57, and transported by this fire extinguishing car 58 to a red-hot coke extinguishing facility (not shown).

[0003] The carbonization chamber 51, combustion chamber 52, and heat storage chamber 53 are constructed of numerous bricks. Inside the combustion chamber 52, as shown in Figure 8, multiple flues (vertical flame channels) 59 are formed along a direction perpendicular to the arrangement direction of the carbonization chamber 51 and combustion chamber 52 (furnace length direction). The carbonization chamber 51 also has a furnace opening into which the extrusion ram 56a (see Figure 7) of the extruder 56 is inserted, and a furnace opening from which the red-hot coke is extruded. Near these furnace openings, backstays 60 (see Figure 8), made of H-shaped steel or the like, are erected to prevent deformation or collapse of the furnace wall.

[0004] In such coke ovens, the wall-forming bricks that make up the walls of the combustion chamber 52 can become severely worn. Conventionally, repairs to the coke oven have been carried out while it is hot by replacing severely worn wall-forming bricks with new bricks (see, for example, Patent Document 1). Various methods are known for repair by replacement (see Patent Documents 2 to 6). [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Patent No. 5347614 [Patent Document 2] Patent No. 6183800 [Patent Document 3] Patent No. 5991478 [Patent Document 4] Patent No. 6753389 [Patent Document 5] Patent No. 5365040 [Patent Document 6] Japanese Patent Publication No. 2019-108510 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] However, when partially replacing a few flues of bricks from the furnace opening while the combustion chamber bricks of a coke oven were still hot, or when replacing all the bricks (through replacement), the following problems arose. Specifically, in these cases, the bricks of the adjacent combustion chamber to the repaired combustion chamber, or the remaining bricks of the unrepaired section that was not demolished, would protrude into the carbonization chamber after the repair. When the combustion chamber bricks protruded into the carbonization chamber, when the coke that had undergone carbonization in the carbonization chamber was being discharged using an extruder, the extruder ram would come into contact with the protruding bricks and stop, causing a blockage that prevented the coke from being discharged from the furnace.

[0007] The present invention aims to solve the above problems and provide a method for repairing a coke oven in which, when repairing the bricks that make up the walls of the combustion chamber of the coke oven while they are hot, the adjacent non-replacement combustion chamber that does not require repair, and the remaining bricks of the non-repaired portion that remains without being dismantled, do not protrude into the carbonization chamber side of the furnace wall after repair, and do not cause clogging. [Means for solving the problem]

[0008] The present invention relates to a coke oven repair method, which involves repairing a coke oven by replacing two or more furnace wall bricks and binder bricks in a hot state, along the furnace length direction from the oven opening, in order to replace the bricks of one combustion chamber or multiple consecutive combustion chambers that constitute the coke oven. The method involves using a three-dimensional measuring instrument from the oven opening to measure the recesses of the furnace walls of adjacent non-replacement combustion chambers adjacent to one side of the one replacement combustion chamber or multiple consecutive replacement combustion chambers, and the furnace walls of adjacent non-replacement combustion chambers adjacent to the other side. A method for repairing a coke oven, characterized by including: a confirmation step of observing the protrusions and confirming that the amount of overhang of the furnace walls of the adjacent non-transferred combustion chambers is less than a predetermined value; and a transfer step of dismantling the portion of the furnace wall of one transferred combustion chamber or a plurality of consecutive transferred combustion chambers that requires repair, and then laying new furnace wall bricks and binder bricks in the dismantled area, if it is confirmed in the confirmation step that the amount of overhang of the furnace walls of the adjacent non-transferred combustion chambers is less than a predetermined value.

[0009] Furthermore, in the coke oven repair method according to the present invention configured as described above, (1) The predetermined value of the overhang amount is such that the confinement rate calculated by the following formula (1) is such that it does not hinder normal operations: Clogging rate (%)=5×10 -8 ×d 5 …(1) Here, d(mm) is the amount of overhang. (2) The value that ensures a compression rate that does not hinder normal operation is 5%, and by calculating d from formula (1), the predetermined value of the overhang is 40 mm. (3) Before dismantling the parts of the transshipment combustion chamber that require repair, the process includes: determining the extent of the furnace wall bricks and binder bricks that require repair by observing the irregularities of the furnace wall from the kiln opening using a three-dimensional measuring instrument; and further confirming the protrusions of the furnace wall determined in the repair range determination process from the flue hole, and dismantling the binder bricks up to those closer to the kiln opening than the binder bricks that are determined to be sound. (4) If the area of ​​the furnace wall bricks and binder bricks requiring repair includes the coal-charging car rails, the step includes reinforcing the rails by providing a gap between the lower surface and the upper part of the coal-charging car rail support so that the coal-charging car load does not directly act on them. (5) The process includes maintaining the furnace wall temperature of the adjacent non-transferred combustion chamber adjacent to the transferred combustion chamber, and the furnace wall temperature of the unrepaired portion of the combustion chamber in the transferred combustion chamber in which the binder bricks have been confirmed to be sound, at 400°C or higher. (6) The process includes: a first new brick stacking step of stacking one flue of first new bricks, which are furnace wall bricks and binder bricks, on the surface of the remaining bricks of the unrepaired portion that have been demolished and exposed as a result of the brick demolition; an insulation material application step of applying insulation material to the exposed surface of the one flue of first new bricks, which are furnace wall bricks and binder bricks, that have been stacked in the first new brick stacking step; and a second new brick stacking step of stacking second new bricks, which are furnace wall bricks and binder bricks, in the remaining repair area, while removing the insulation material from the bottom. (7) The process includes: rearranging the furnace wall bricks by forming vertically penetrating joints at the boundary between the repaired furnace wall portion and the unrepaired furnace wall portion; placing at least the furnace wall bricks of the unrepaired portion and an unrepaired side overhang prevention member spanning between the furnace wall bricks and the furnace wall surface facing each other across the space of the carbonization chamber, and at least the furnace wall bricks of the repaired furnace wall portion and an repaired side overhang prevention member spanning between the furnace wall bricks and the furnace wall surface facing each other across the space of the carbonization chamber, in the carbonization chamber, and then raising the temperature of the furnace; and after raising the temperature, spraying thermal spray material into the joints which are the gaps at the boundary between the repaired bricks and the unrepaired bricks. (8) The process includes: a first overhang prevention member installation step, in which a first overhang prevention member is installed in a second carbonization chamber between the re-storage combustion chamber to be repaired, a first adjacent non-re-storage combustion chamber adjacent in the furnace width direction, and a second adjacent non-re-storage combustion chamber further beyond, at a position that includes at least the position corresponding to the first binder brick from the kiln mouth among the plurality of binder bricks forming the first adjacent non-re-storage combustion chamber, to maintain a constant width of the second carbonization chamber at that position; a repair step, in which the furnace wall bricks and binder bricks of the repaired portion of the re-storage combustion chamber are dismantled and re-stored; a second overhang prevention member installation step, in which a second overhang prevention member is installed in a first carbonization chamber between the re-storage combustion chamber and the first adjacent non-re-storage combustion chamber, at a position that includes at least the position corresponding to the first binder brick from the kiln mouth among the plurality of binder bricks forming the re-storage combustion chamber, to maintain a constant width of the first carbonization chamber at that position; and a heating step, in which the re-storage combustion chamber is heated. This is considered to be a more preferable solution. [Effects of the Invention]

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

[0011] [Figure 1A] This diagram illustrates repair procedures for adjacent non-transshipment combustion chambers when there are no overhangs on the furnace wall. [Figure 1B] This diagram illustrates repair procedures for adjacent non-transshipment combustion chambers when there are no overhangs on the furnace wall. [Figure 1C] This diagram illustrates repair procedures for adjacent non-transshipment combustion chambers when there are no overhangs on the furnace wall. [Figure 2A] This diagram illustrates the repair process when there is an overhang on the furnace wall of an adjacent non-transshipment combustion chamber. [Figure 2B] This is a diagram for explaining the repair when there is an overhang on the furnace wall of an adjacent non-rechargeable combustion chamber. [Figure 2C] This is a diagram for explaining the repair when there is an overhang on the furnace wall of an adjacent non-rechargeable combustion chamber. [Figure 3] This is a diagram for explaining the implementation state of Example 1. [Figure 4] This is a diagram for explaining the implementation state of Example 2. [Figure 5] This is a diagram for explaining the implementation state of Example 3. [Figure 6] This is a graph showing the relationship between the pressing rate and the overhang amount obtained when the charging amount is 30 t with full filling. [Figure 7] This is a diagram for explaining an example of a known coke oven. [Figure 8] This is a top view of a known coke oven.

Modes for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be specifically described. Note that the following embodiments are examples of methods for embodying the technical idea of the present invention, and do not specify the configuration to the following. That is, the technical idea of the present invention can be variously modified within the technical scope described in the claims.

[0013] <Summary of the Present Invention> This invention relates to a method for repairing coke ovens and is based on the following findings. Conventionally, in coke oven repair methods, when repairing the transshipment combustion chamber to be repaired, there was a problem in that the furnace wall of the adjacent non-transshipment combustion chamber protruded into the carbonization chamber. Furthermore, if the adjacent non-transshipment combustion chamber protruded significantly, it was not possible to properly install the insulation panel, resulting in a decrease in the temperature of the adjacent non-transshipment combustion chamber, which also caused it to protrude into the carbonization chamber. To solve these problems, the condition of the furnace wall of the adjacent non-transshipment combustion chamber was observed before repairing the transshipment combustion chamber, and it was determined that the furnace wall of the adjacent non-transshipment combustion chamber was sound if it met certain conditions. It was found that by repairing the transshipment combustion chamber when the adjacent non-transshipment combustion chamber was determined to be sound, the furnace wall of the adjacent non-transshipment combustion chamber did not protrude into the carbonization chamber after the repair.

[0014] In this invention, the adjacent non-transferring combustion chamber adjacent to the transferring combustion chamber refers to the adjacent non-transferring combustion chamber adjacent to one side of a single transferring combustion chamber or a series of consecutive transferring combustion chambers, and the adjacent non-transferring combustion chamber adjacent to the other side. However, in the following description, the method for repairing a coke oven according to the present invention will be described assuming that the transferring combustion chamber is a single transferring combustion chamber. It goes without saying that the following description can also be applied to a series of consecutive transferring combustion chambers.

[0015] Figures 1A to 1C illustrate the repair process when there is no overhang on the furnace wall of an adjacent non-transferring combustion chamber. First, as shown in Figure 1A, the irregularities of the furnace walls of the adjacent non-transferring combustion chamber adjacent to one side of the transferring combustion chamber to be repaired, and the furnace walls of the adjacent non-transferring combustion chamber adjacent to the other side, are observed using a 3D measuring instrument to confirm that the overhang of the furnace walls of the adjacent non-transferring combustion chambers is below a predetermined value. Next, as shown in Figure 1B, insulation panels are installed on the surfaces of each adjacent non-transferring combustion chamber facing the transferring combustion chamber to be repaired, and the transferring portion of the transferring combustion chamber is dismantled. After that, as shown in Figure 1C, transferring is performed on the dismantled portion of the transferring combustion chamber, and the transferring 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 below a predetermined value in Figure 1A, there is no overhang on the furnace wall, as shown in Figure 1C.

[0016] Figures 2A to 2C illustrate the repair process when there is an overhang in the furnace wall of an adjacent non-transferring combustion chamber. First, as shown in Figure 2A, the irregularities of the furnace walls of the adjacent non-transferring combustion chamber adjacent to one side of the transfer combustion chamber to be repaired, and the furnace walls of the adjacent non-transferring combustion chamber adjacent to the other side, are observed using a 3D measuring instrument. Figure 2A shows an example where the furnace wall of the adjacent non-transferring combustion chamber adjacent to the upper side of the transfer combustion chamber overhangs by more than a predetermined value, and the furnace wall of the adjacent non-transferring combustion chamber adjacent to the lower side of the transfer combustion chamber overhangs by less than a predetermined value. Next, as shown in Figure 2B, insulation panels are installed on the surfaces of each adjacent non-transferring combustion chamber facing the transfer combustion chamber to be repaired, and the transfer portion of the transfer combustion chamber is dismantled. At this time, the overhang on the furnace wall of the upper adjacent non-transferring combustion chamber that overhangs by more than a predetermined value will obstruct the installation of the insulation panel. Subsequently, as shown in Figure 2C, the re-storage is performed on the dismantled portion of the re-storage combustion chamber, and the re-storage combustion chamber that requires repair is repaired. At this time, in the upper adjacent non-re-storage combustion chamber, where it was confirmed in Figure 2A that the furnace wall overhang was above a predetermined value, the amount of overhang becomes larger after re-storage than before re-storage, as shown in Figure 2C. On the other hand, in the lower adjacent non-re-storage combustion chamber, where it was confirmed in Figure 2A that the furnace wall overhang was below a predetermined value, the amount of overhang does not change before and after re-storage, as shown in Figure 2C.

[0017] Based on the above findings, the present invention provides a coke oven repair method, which involves repairing the bricks of one combustion chamber or multiple consecutive combustion chambers that constitute the coke oven by replacing two or more furnace wall bricks and binder bricks while the furnace is hot, along the furnace length from the furnace opening, and is characterized by including: a confirmation step of observing the irregularities of the furnace walls of adjacent non-replacement combustion chambers adjacent to one side and adjacent non-replacement combustion chambers adjacent to the other side of one replacement combustion chamber or multiple consecutive replacement combustion chambers using a three-dimensional measuring instrument from the furnace opening, and confirming that the amount of overhang of each adjacent non-replacement combustion chamber's furnace wall is less than a predetermined value; and a replacement step of dismantling the portion of the furnace wall of one replacement combustion chamber or multiple consecutive replacement combustion chambers that requires repair, and stacking new furnace wall bricks and binder bricks in the dismantled area, if it is confirmed in the confirmation step that the amount of overhang of the adjacent non-replacement combustion chamber's furnace wall is less than a predetermined value.

[0018] According to the coke oven repair method of the present invention described above, when repairing the bricks constituting the furnace wall of the combustion chamber of the coke oven while it is hot, the furnace wall of the adjacent non-transferred combustion chamber adjacent to one side and the furnace wall of the adjacent non-transferred combustion chamber adjacent to the other side will not protrude towards the carbonization chamber after the repair.

[0019] Furthermore, in a preferred embodiment, the coke oven repair method of the present invention includes a repair range determination step, in which, before dismantling the parts of the transshipment combustion chamber that require repair, the range of furnace wall bricks and binder bricks that require repair is determined by observing the irregularities of the furnace wall from the kiln opening with a three-dimensional measuring instrument; and a step of further confirming the protrusions of the furnace wall determined in the repair range determination step from the flue hole, and dismantling up to the binder bricks closer to the kiln opening than the binder bricks that are determined to be sound.

[0020] According to a preferred embodiment of the coke oven repair method of the present invention described above, when repairing the bricks constituting the furnace wall of the combustion chamber of a coke oven while it is hot, the remaining bricks of the unrepaired portion that remains without dismantling the replacement combustion chamber to be repaired will not protrude towards the carbonization chamber after the repair.

[0021] <Regarding known technologies suitably used 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 the coke oven repair method using the techniques already known in patent publications and published documents, as illustrated below.

[0022] In the coke oven repair method of the present invention, as described in Patent Document 2 (Japanese Patent No. 6183800), if the range of furnace wall bricks and binder bricks requiring repair includes the coal-charging car rails, it is preferable to include a step of reinforcing the rails by providing a gap between the lower surface of the coal-charging car rail support and the ceiling so that the coal-charging car load does not directly act on the rails. According to this embodiment, in the coke oven repair method of the present invention, damage to the ceiling where the coal-charging car rail support is installed (damage and deformation of ceiling bricks and joints) can be effectively suppressed.

[0023] In the coke oven repair method of the present invention, it is preferable to include a step of maintaining the furnace wall temperature of the adjacent non-transferred combustion chamber adjacent to the transferred combustion chamber, and the furnace wall temperature of the non-repaired portion of the transferred combustion chamber in which the binder bricks have been confirmed to be sound, at 400°C or higher, as described in Patent Document 3 (Japanese Patent No. 5991478). According to this embodiment, the coke oven repair method of the present invention can provide a partial transferred repair method for a coke oven that improves construction efficiency and virtually eliminates the risk of overhang or detachment.

[0024] In the coke oven repair method of the present invention, as described in Patent Document 4 (Japanese Patent No. 6753389), it is preferable to include a first new brick stacking step of stacking one flue of first new bricks, namely furnace wall bricks and binder bricks, on the surface of the furnace wall bricks and binder bricks, which are the remaining bricks of the unrepaired portion that have been dismantled, as exposed by the dismantling of the bricks; an insulating material attachment step of attaching insulating material to the exposed surface of the furnace wall bricks and binder bricks, which are the first new bricks of one flue that have been stacked in the first new brick stacking step; and a second new brick stacking step of stacking second new bricks, namely furnace wall bricks and binder bricks, in the remaining repair area, while removing insulating material from the bottom. According to this embodiment, in the coke oven repair method of the present invention, the amount of heat radiated from the surface exposed by the dismantling of the bricks can be reduced even in the upper part of the remaining bricks of the unrepaired portion of the combustion chamber to be repaired, and the temperature drop from the top to the bottom of the remaining bricks can be suppressed.

[0025] In the coke oven repair method of the present invention, it is preferable to include the steps of: rearranging the furnace wall bricks by forming vertically penetrating joints at the boundary between the re-laid and repaired furnace wall portion and the unrepaired furnace wall portion, as described in Patent Document 5 (Japanese Patent No. 5365040); arranging at least the unrepaired furnace wall bricks and the unrepaired side overhang prevention member so as to span between the furnace wall bricks and the furnace wall surface facing each other across the space between the furnace wall bricks and the carbonization chamber, and arranging at least the re-laid and repaired furnace wall bricks and the repaired side overhang prevention member so as to span between the furnace wall bricks and the furnace wall surface facing each other across the space between the furnace wall bricks and the carbonization chamber, in the carbonization chamber, and then raising the temperature of the furnace; and after raising the temperature, spraying thermal spray material into the joints, which are the gaps at the boundary between the re-laid and repaired bricks and the unrepaired bricks. According to this embodiment, in the coke oven repair method of the present invention, it is possible to minimize the overhang at the boundary between the repaired portion and the unrepaired portion when the furnace wall bricks of the coke oven are reheated, thereby suppressing deformation of the furnace wall bricks during hot repair.

[0026] In the coke oven repair method of the present invention, as described in Patent Document 6 (Japanese Patent Publication No. 2019-108510), a first overhang prevention member is installed in the second carbonization chamber between the transshipment combustion chamber to be repaired, a first adjacent non-transshipment combustion chamber adjacent in the furnace width direction, and a second adjacent non-transshipment combustion chamber further beyond, at a position that includes at least the position corresponding to the first binder brick from the kiln mouth among the plurality of binder bricks forming the first adjacent non-transshipment combustion chamber, thereby maintaining a constant width of the second carbonization chamber at that position. Preferably, the method includes a component installation step, a repair step of dismantling and replacing the furnace wall bricks and binder bricks of the repaired portion of the replacement combustion chamber, a second overhang prevention member installation step of installing a second overhang prevention member in the first carbonization chamber between the replaced replacement combustion chamber and the first adjacent non-replacement combustion chamber at a position that includes at least the position corresponding to the first binder brick from the kiln mouth among the plurality of binder bricks forming the replacement combustion chamber, thereby maintaining a constant width of the first carbonization chamber at that position, and a heating step of raising the temperature of the replaced replacement combustion chamber. According to this embodiment, in the coke oven repair method of the present invention, when repairing the furnace wall bricks and partition bricks near the kiln mouth of the combustion chamber, it is possible to appropriately prevent overhang of the furnace wall bricks of the replacement combustion chamber being repaired and the first adjacent non-replacement combustion chamber adjacent to this replacement combustion chamber.

[0027] <Regarding preferred embodiments of predetermined values ​​in the present invention> The preferred predetermined values ​​in the present invention are determined as follows. After carbonization is complete, the coke is discharged from the coke oven to a fire extinguishing vehicle by an extrusion ram. At this time, clogging can occur due to equipment problems with the extrusion ram. One of the causes of this is that the movement of the extrusion ram is interfered with by the protrusion of the combustion chamber bricks, causing clogging.

[0028] In the present invention, from the relationship between the overhang amount of bricks and the ramming rate, a preferred embodiment of a predetermined value as the upper limit of the overhang amount where ramming does not occur is sought. Specifically, first, in a coke oven with a charging amount of 30 t where the charging amount is full charge, the ramming rate and the overhang amount were actually determined. Table 1 below shows the data of the ramming rate and the overhang amount obtained when the charging amount is 30 t. Further, FIG. 6 is a graph showing the relationship between the ramming rate and the overhang amount based on the data in Table 1.

[0029] [Table 1]

[0030] From the results of Table 1 and FIG. 6 above, the following formula (1) was obtained by regression analysis. Ramming rate (%) = 5 × 10 -8 × d 5 …(1) Here, d (mm) is the overhang amount.

[0031] Therefore, it can be seen that the preferred predetermined value in the present invention is a value that can ensure a ramming rate calculated by formula (1) that does not hinder normal operation.

[0032] Here, in the normal operation of a coke oven, if the ramming rate < 5%, it is considered that the operation is possible almost without problems. Therefore, if the overhang amount d satisfies formula (1) < 5%, it is considered that there is no problem with ramming. Thus, when obtaining the range of the above d from formula (1), Ramming rate (%) = 5 × 10 -8 × d 5 < 5 ⇔ d < (5 ÷ (5 × 10 -8 )) 1 / 5 = 40 mm (← 10 8 / 5 = 39.8) It becomes. From this result, it can be seen that the preferred predetermined value of the overhang amount is 40 mm, and an example of its specific range is less than 40 mm.

Example

[0033] <Example 1> As shown in Figure 3, for the combustion chamber to be repaired (replacement combustion chamber) and the two adjacent combustion chambers (adjacent non-replacement combustion chambers) that make up the coke oven, the unevenness of the furnace wall was measured using a laser scanner at a predetermined position on the kiln mouth brick of the adjacent combustion chambers (adjacent non-replacement combustion chambers) before and after replacement of the combustion chamber to be repaired (replacement combustion chamber). In addition, the presence or absence of cracks was observed by viewing through the flue hole before replacement of the combustion chamber to be repaired (replacement combustion chamber). The results are shown in Table 2 below.

[0034] [Table 2]

[0035] From the results in Table 2, it can be seen that if the kiln opening overhang of the adjacent combustion chamber (adjacent non-transferred combustion chamber) is +40mm before transposition, this overhang will be exacerbated after transposition. Therefore, it is necessary to keep the kiln opening overhang of the adjacent combustion chamber (adjacent non-transferred combustion chamber) below +40mm before transposition. Furthermore, it can be seen that if the overhang is ≤15mm, there is almost no change after transposition (within the measurement error range). In addition, it can be seen that there is a correlation between the magnitude of the kiln opening overhang and the presence or absence of brick cracks from within the flue hole.

[0036] <Example 2> As shown in Figure 4, in an example where a brick to prevent kiln opening overhang was placed between the combustion chamber to be repaired (replacement combustion chamber) and two adjacent combustion chambers (adjacent non-replacement combustion chambers) that constitute the coke oven, the unevenness of the furnace wall was measured using a laser scanner at a predetermined position on the kiln opening brick of the adjacent combustion chambers (adjacent non-replacement combustion chambers) before and after replacement of the combustion chamber to be repaired (replacement combustion chamber). In addition, the presence or absence of cracks was observed by observation from the flue hole before replacement of the combustion chamber to be repaired (replacement combustion chamber). The results are shown in Table 3 below.

[0037] [Table 3]

[0038] The results in Table 3 show that installing anti-overhang bricks at the kiln opening suppresses overhang after re-laying. However, it is clear that if the overhang is as much as +40mm, it is difficult to suppress further overhang even with anti-overhang bricks.

[0039] <Example 3> As shown in Figure 5, we investigated the case where a portion of the combustion chamber to be repaired (replacement combustion chamber) is left intact. In an example where a brick to prevent the kiln opening from overhanging was placed between the combustion chamber to be repaired (replacement combustion chamber) and two adjacent combustion chambers (adjacent non-replacement combustion chambers) that make up a portion of the coke oven, the unevenness of the furnace wall was measured using a laser scanner at a predetermined position on the kiln opening brick of the adjacent combustion chambers (adjacent non-replacement combustion chambers) before and after replacement of the combustion chamber to be repaired (replacement combustion chamber). In addition, the presence or absence of cracks was observed by viewing through the flue hole before replacement of the combustion chamber to be repaired (replacement combustion chamber). The results are shown in Table 4 below.

[0040] [Table 4]

[0041] The results in Table 4 show that if there are cracks in the remaining combustion chamber (old bricks), the furnace wall will protrude after replacement (even if it is not protruding in that area). Furthermore, the results mentioned above indicate that suppressing protrusion is difficult, regardless of whether or not anti-protrusion bricks are installed. [Industrial applicability]

[0042] In the coke oven repair method of the present invention, the extent of furnace wall bricks and binder bricks to be appropriately repaired can be determined by observing the condition of the wall of the adjacent combustion chamber (adjacent non-transfer combustion chamber) before dismantling the bricks of the transshipment combustion chamber to be repaired. Therefore, the problem of the wall of the adjacent combustion chamber (adjacent non-transfer combustion chamber) protruding into the carbonization chamber after repair can be solved, making it industrially useful. [Explanation of Symbols]

[0043] 51 Carbonization Chamber 52 Combustion chamber 53 Heat storage chamber 54 Coal loading port 55 Coal loading car 56 Extruder 56a Extrusion Ram 57 Guide vehicle 58 Fire truck 59 Flue (Vertical Flame Path) 60 Backstay

Claims

1. A method for repairing a coke oven, which involves repairing the bricks of one combustion chamber or multiple consecutive combustion chambers that make up the coke oven by rearranging two or more furnace wall bricks and binder bricks along the length of the furnace from the oven opening while the oven is hot. From the previously determined data on the compaction rate and the amount of brick overhang, the following equation (1) was obtained by regression analysis. Clogging rate (%) = 5 × 10 -8 × d 5 ... (1) Here, d (mm) is the amount of overhang. From the above formula (1), a predetermined value is determined as the predetermined value of the overhang amount, which is the amount of overhang d that can ensure a compression rate that does not hinder normal operation. A verification step in which the irregularities of the furnace walls of adjacent non-transferring combustion chambers adjacent to one side and adjacent non-transferring combustion chambers adjacent to the other side of the single transferring combustion chamber or multiple consecutive transferring combustion chambers are observed using a three-dimensional measuring instrument from the furnace opening, and it is confirmed that the amount of protrusion of each of the furnace walls of the adjacent non-transferring combustion chambers is less than the predetermined value, If, in the aforementioned verification step, it is confirmed that the overhang of the furnace wall of the adjacent non-transferred combustion chamber is less than the predetermined value, a transfer step is performed in which the necessary repairs to the furnace wall of one or more consecutive transferred combustion chambers are dismantled, and new furnace wall bricks and binder bricks are laid in the dismantled area. A method for repairing a coke oven, characterized by including the following.

2. The method for repairing a coke oven according to claim 1, characterized in that the value that ensures a packing rate that does not hinder normal operation is 5%, and by calculating d from formula (1), the predetermined value of the overhang is 40 mm.

3. Before dismantling the parts of the aforementioned transshipment combustion chamber that require repair, a repair area determination process is performed in which the extent of the furnace wall bricks and binder bricks requiring repair is determined by observing the irregularities of the furnace wall from the kiln opening using a three-dimensional measuring instrument. The process involves further checking the protrusions of the furnace wall determined in the aforementioned repair scope determination process through the flue hole, and dismantling the binder bricks up to those closer to the kiln opening than the binder bricks that were determined to be sound, A method for repairing a coke oven according to claim 1, characterized by including the following.

4. If the area of ​​the furnace wall bricks and binder bricks requiring repair includes the coal-charging car rails, The process involves creating a gap between the lower surface and the upper part of the coal-charging car rail support, so that the coal-charging car load does not directly act on it, thereby reinforcing the rail. A method for repairing a coke oven according to any one of claims 1 to 3, characterized by including the following:

5. A step of maintaining the furnace wall temperature of the adjacent non-transfer combustion chamber adjacent to the aforementioned transfer combustion chamber, and the furnace wall temperature of the unrepaired portion of the combustion chamber within the transfer combustion chamber in which the binder bricks have been confirmed to be sound, at 400°C or higher. A method for repairing a coke oven according to any one of claims 1 to 3, characterized by including the following:

6. The first new bricklaying process involves laying one flue of new bricks, consisting of furnace wall bricks and binder bricks, onto the surface of the remaining bricks of the unrepaired section, which are the furnace wall bricks and binder bricks, that are exposed as a result of the brick demolition. The process includes an insulation member application step in which an insulation member is applied to the exposed surface of the furnace wall bricks and binder bricks, which constitute one flue of the first new bricks laid in the first new brick laying step, In the remaining repair area, the second new brickwork process involves stacking the furnace wall bricks and binder bricks, which are the second new brickwork, while removing the insulation material from the bottom. A method for repairing a coke oven according to any one of claims 1 to 3, characterized by including the following:

7. The process involves creating vertically penetrating joints at the boundary between the repaired and unrepaired sections of the furnace wall and then replacing the furnace wall bricks. The process of raising the temperature of the furnace after arranging, in the boundary portion and its vicinity, at least the furnace wall bricks of the unrepaired portion and the unrepaired side overhang prevention member so as to span between the furnace wall bricks and the furnace wall surface facing each other across the space of the carbonization chamber, and at least the furnace wall bricks of the re-repaired portion and the repaired side overhang prevention member so as to span between the furnace wall bricks and the furnace wall surface facing each other across the space of the carbonization chamber, within the carbonization chamber, After heating, the process involves spraying thermal spray material into the joints, which are the gaps at the boundary between the bricks of the rebuilt and repaired portion and the bricks of the unrepaired portion. A method for repairing a coke oven according to any one of claims 1 to 3, characterized by including the following:

8. A first overhang prevention member installation step involves installing a first overhang prevention member in a second carbonization chamber between the re-storage combustion chamber to be repaired, a first adjacent non-storage combustion chamber adjacent in the furnace width direction, and a second adjacent non-storage combustion chamber further beyond, at a position that includes at least the position corresponding to the first binder brick from the kiln mouth among the plurality of binder bricks forming the first adjacent non-storage combustion chamber, thereby maintaining a constant width of the second carbonization chamber at that position. The repair process involves dismantling and replacing the furnace wall bricks and binder bricks in the repaired section of the aforementioned re-carrying combustion chamber, A second overhang prevention member installation step involves installing a second overhang prevention member in the first carbonization chamber between the re-sequenced combustion chamber and the first adjacent non-sequenced combustion chamber, at a position that includes at least the position corresponding to the first binder brick from the kiln opening among the plurality of binder bricks forming the re-sequenced combustion chamber, to maintain a constant width of the first carbonization chamber at that position; A heating step for raising the temperature of the re-combustion chamber that has been re-combusted, A method for repairing a coke oven according to any one of claims 1 to 3, characterized by including the following:

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