Method for measuring shape of oven wall of coke oven and method for repairing oven wall of coke oven

Abstract

The invention provides a method for measuring the shape of a furnace wall of a coke oven. The method can prevent deformation of a laser irradiation hole and a detection hole caused by radiation heat from a carbonization chamber. In the method for measuring the shape of the furnace wall, a laser-type three-dimensional shape measuring device (20) is provided on the outside of a carbonization chamber (10) from which a furnace lid (12) has been removed, and the shape of the furnace wall of the carbonization chamber (10) is measured by the laser-type three-dimensional shape measuring device (20), the furnace wall shape of the carbonization chamber (10) is measured by determining the time t and the distance L so as to satisfy the following formula (1), where TW is the furnace temperature in the carbonization chamber (10), t is the time from the removal of the furnace lid (12) to the start of measurement by the laser-type three-dimensional shape measurement device (20), and L is the distance from the furnace mouth (11) to the laser-type three-dimensional shape measurement device (20). (10 / t) / {(L + 4) / 5.5} 2 * TW4 < = 4.1 * 1012... (1).

Description

Technical Field

[0001] The present invention relates to a furnace wall shape measuring method for measuring the furnace wall shape of a carbonization chamber in a coke oven and a furnace wall repairing method for a coke oven. Background Art

[0002] In the steel industry, coke ovens are used to make coke from coal. In recent years, many coke ovens have aged for 40 years since they were built. The coke oven is a structure in which bricks are stacked while being bonded with a thin mortar layer and fastened from the front, back, left and right to maintain the shape. The coke oven has the following structure: a regenerator is provided on the foundation, and on the upper side, a cavity called a carbonization chamber with a height of about 6m, a width of about 400mm, and a depth of about 16m is arranged alternately in the width direction, and a combustion chamber with a width of about 900mm for burning fuel gas is arranged, and a brick ceiling is arranged on the upper part.

[0003] In a coke oven, the heat obtained by burning fuel inside the combustion chamber passes through the wall bricks of the combustion chamber, so that the carbonization chamber becomes above 1000°C, and coal is fed from the charcoal loading hole at the top of the carbonization chamber, and the coal is distilled to produce coke. For the coke cake after distillation, an ejector plunger is inserted from one side of the furnace opening of about 6m in height and 400mm in width at both ends of the carbonization chamber, and the coke cake inside the carbonization chamber is discharged from the other furnace opening. In the coke oven, after the construction is completed, the fuel is burned inside to gradually increase the temperature of the bricks to above 1000°C. The temperature of the bricks is maintained until the coke oven is shut down.

[0004] The wall bricks that separate the combustion chamber from the carbonization chamber are called furnace walls, which are responsible for shielding the combustion gas from flowing into the carbonization chamber, transferring the combustion heat to the carbonization chamber, and supporting the ceiling. The furnace wall is always acted on by the ceiling load and furnace fastening force, and the ejection plunger load and ejection friction force are temporarily acted on during the ejection. The ceiling load and furnace fastening force have the effect of stabilizing the furnace wall structure, but if aging progresses, the following problems will occur on the furnace wall.

[0005] (1) A gap appears at the joint of the furnace wall and the joint is disconnected.

[0006] (2) A defect in which one or more bricks have fallen off the furnace wall.

[0007] (3) Depressions on the wider surface of the furnace wall where the bricks have worn away and become thinner.

[0008] (4) A protrusion on the wider surface of the furnace wall where the bricks are tilted and extend toward the carbonization chamber.

[0009] When the furnace fastening force and the pushing force act on the furnace wall that has such problems, the bricks may collapse. In addition, when the furnace wall is uneven due to depressions, defects, protrusions, etc., the distance between the left and right furnace wall surfaces of the carbonization chamber (furnace width) changes from the designed dimensions, so the pushing property of the coke deteriorates. Therefore, when depressions, defects or protrusions are generated in the furnace wall, the depressions are repaired by surfacing welding based on the spraying and plating of amorphous materials, the defects are repaired by replacing bricks, and the protrusions are repaired by reinstalling bricks, so that the furnace wall is restored to a healthy state.

[0010] In order to carry out such repair, it is necessary to measure the shape of the furnace wall of the carbonization chamber and detect damage and deformation of the furnace wall. As a method for measuring the shape of the furnace wall of the carbonization chamber, Patent Documents 1 and 2 disclose a method for diagnosing the furnace wall of a coke oven, in which a laser-type three-dimensional shape measuring device is arranged outside the carbonization chamber, and a laser is irradiated to the furnace wall in the carbonization chamber to measure the shape of the furnace wall of the carbonization chamber.

[0011] Prior art literature Patent Literature Patent Document 1: Japanese Patent Application Publication No. 2013-82909 Patent Document 2: Japanese Patent Application Publication No. 2014-218557 Summary of the invention

[0012] Problems to be solved by the invention

[0013] When using a laser-type three-dimensional shape measuring device, the device is insulated with heat-resistant cloth or the like in order to protect it from the influence of the radiant heat from the carbonization chamber. However, in order to measure the shape of the furnace wall of the carbonization chamber, it is necessary to irradiate the furnace wall of the carbonization chamber with laser light and receive the reflected light from the furnace wall. Therefore, during the measurement of the furnace wall shape, the laser irradiation hole and the detection hole cannot be insulated with heat-resistant cloth. Therefore, in the furnace wall diagnosis method disclosed in Patent Documents 1 and 2, there is a problem that the laser irradiation hole and the detection hole are deformed due to the radiant heat from the carbonization chamber, and the shape of the furnace wall cannot be measured.

[0014] The present invention is accomplished in view of the problems of the prior art, and its object is to provide a method for measuring the shape of a coke oven wall and a method for repairing a coke oven wall that can prevent deformation of laser irradiation holes and detection holes caused by radiation heat from a carbonization chamber.

[0015] Technical solutions to solve problems

[0016] The gist of the present invention that can solve the above-mentioned problems is as follows.

[0017] [1] A method for measuring the shape of a coke oven wall, comprising: providing a laser three-dimensional shape measuring device on the outer side of a carbonization chamber with a furnace cover removed, and using the laser three-dimensional shape measuring device to measure the shape of the furnace wall of the carbonization chamber, wherein the time from the removal of the furnace cover to the start of measurement using the laser three-dimensional shape measuring device and the distance from the furnace mouth to the laser three-dimensional shape measuring device are determined in a manner that satisfies the following formula (1), so as to measure the shape of the furnace wall. (10 / t) / {(L+4) / 5.5} 2 ×T W 4 ≤4.1×10 12 … (1), Here, T W is the temperature inside the carbonization chamber (K), t is the time from removing the furnace cover to starting the measurement by the laser three-dimensional shape measuring device (min), and L is the distance from the furnace mouth to the laser three-dimensional shape measuring device (m).

[0018] [2] The method for measuring the shape of a coke oven wall according to [1], wherein the time from removal of the oven cover to start of measurement using the laser three-dimensional shape measuring device is 10 minutes or more.

[0019] [3] The method for measuring the shape of a coke oven wall according to [1] or [2], wherein the time from removal of the oven cover to start of measurement using the laser three-dimensional shape measuring device is within 60 minutes.

[0020] [4] A method for repairing a coke oven wall, comprising repairing the wall of the carbonization chamber based on the shape of the wall measured by the method for measuring the shape of the coke oven wall described in [1] or [2].

[0021] [5] A method for repairing a furnace wall of a coke oven, comprising repairing the furnace wall of the carbonization chamber based on the furnace wall shape measured by the method for measuring the furnace wall shape of a coke oven described in [3].

[0022] Effects of the Invention

[0023] According to the present invention, by determining the time from the removal of the coke oven cover to the start of measurement and the distance from the oven mouth in a manner satisfying the above formula (1), it is possible to prevent thermal deformation of the laser irradiation hole and the detection hole. As a result, the shape of the coke oven wall can be measured using a laser three-dimensional shape measuring device, and the coke oven wall can be repaired based on the shape data of the coke oven wall obtained by the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a perspective schematic diagram showing a state where the shape of the furnace wall of the carbonization chamber 10 is measured by the method for measuring the furnace wall shape of the coke oven according to the present embodiment. Figure 2 is a schematic diagram illustrating the radiant heat released from the carbonization chamber. DETAILED DESCRIPTION

[0025] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The following embodiment shows a preferred example of the present invention, and the present invention is not limited to these examples.

[0026] Figure 1 1 is a perspective view showing a state in which the shape of the furnace wall of the carbonization chamber 10 is measured by the method for measuring the shape of the furnace wall of the coke oven according to the present embodiment. Figure 1 As shown, the shape of the furnace wall of the carbonization chamber 10 in the coke oven 1 is measured by a laser-type three-dimensional shape measuring device 20 disposed on a platform 30 in front of the carbonization chamber 10. The laser-type three-dimensional shape measuring device 20 is a device that measures the shape of the furnace wall of the carbonization chamber 10 as a point group by obliquely irradiating a laser 21 from a furnace port 11 with the furnace cover 12 removed toward the furnace wall 13 through a laser irradiation hole and receiving reflected light from the furnace wall 13 through a detection hole.

[0027] In the laser-type three-dimensional shape measuring device 20, it is preferred to measure the shapes of the left and right furnace walls of the carbonization chamber 10 separately. The upper side of the carbonization chamber 10 is about 6m in height, about 400mm in width, and about 16m in depth, and the furnace mouth 11 is a slender structure with a width of about 400mm and a height of about 6m. In the case of irradiating the laser 21 from the outside of the carbonization chamber 10, if the shapes of the furnace walls on the left and right sides are to be measured at once, the incident angle of the laser 21 relative to the furnace wall 13 becomes smaller. If the laser 21 is incident at a small angle like this, then in the case of the furnace wall 13 protruding, the inner side thereof becomes a shadow and the laser 21 cannot reach it, and the shape of the furnace wall cannot be measured. On the other hand, by measuring the shapes of the furnace walls on the left and right sides respectively, the incident angle of the laser 21 relative to the furnace wall 13 can be increased, so the shape of the furnace wall can be measured even in the case of the furnace wall 13 protruding.

[0028] The left and right furnace wall shape data measured by the laser three-dimensional shape measuring device 20 can be evaluated separately, or the two furnace wall shape data can be synthesized based on the reference object around the carbonization chamber 10 and evaluated as a synthetic furnace wall shape data. In the case of evaluating the two shape data separately, the average plane is calculated based on the measured point group, and the distance of each point from the average plane is calculated, thereby quantifying the concave and convex state of the furnace wall 13. Regarding the calculation of the distance, the distance in the normal direction of each point and the average plane can be calculated, and the distance in the width direction of the carbonization chamber 10 can also be calculated. In this way, the concave and convex state of the furnace wall 13 can be confirmed using the two furnace wall shape data.

[0029] When pushing out the coke from the carbonization chamber 10, an ejector plunger having a width of about 350 mm is inserted into the carbonization chamber 10 having a width of about 400 mm. Therefore, the distance between the left and right furnace walls is important for whether the ejector plunger can smoothly pass through the carbonization chamber 10. In order to calculate the distance between the left and right furnace walls, it is preferred to use a synthetic furnace wall shape data obtained by synthesizing the left and right furnace wall shape data based on the reference object around the carbonization chamber 10 to calculate the distance between the left and right furnace walls.

[0030] Specifically, first, at least two dedicated reference bodies 22 are set around the furnace mouth 11, and the positions of the reference bodies 22 are measured while measuring the left and right furnace wall shapes. Then, the center positions of the reference bodies 22 in the respective measurement data are calculated. Since the positional relationship of the reference bodies 22 does not change, by finding a one-to-one correspondence between the center positions of the reference bodies 22 in the left and right furnace wall shape data, and moving one of the furnace wall shape data in a way that they overlap, the two furnace wall shape data can be aggregated into one composite furnace wall shape data.

[0031] The reference body 22 may be a reference body dedicated to the laser-type three-dimensional shape measuring device 20. If there is a reference body whose position is easy to determine around the carbonization chamber 10, the reference body may also be used. A component called a furnace frame is provided near the furnace mouth 11. The furnace frame is replaced and repaired when damage develops, or is installed with the furnace wall 13 as a reference. Therefore, the furnace frame may be used as a reference instead of the reference body 22. As a result, the relative positional relationship of the left and right furnace walls 13 becomes clear, and a synthetic furnace wall shape data can be created with high precision.

[0032] When the coke cake is pushed out, in order to prevent the coke cake from rubbing against the furnace wall, the coke oven is formed into a tapered shape so that the furnace width on the side where the coke cake is pushed out is about 30 mm wider than the furnace width on the side where the ejection plunger is inserted. That is, since a taper of about 30 mm is provided on both sides relative to the depth of 16 m, deviations may sometimes occur in the evaluation of the concave and convex state of the average plane calculated based on the separate furnace wall shape data. In contrast, by using the synthetic furnace wall shape data obtained by synthesizing the left and right furnace wall shape data, the expansion of the furnace width also becomes clear, so by comparing with the design shape data, the concave and convex state of the furnace wall 13 can be accurately grasped.

[0033] In this way, by using the laser-type three-dimensional shape measuring device 20, the shape of the furnace wall of the carbonization chamber 10 in the coke oven 1 can be measured. In addition, by comparing the furnace wall shape data obtained by measuring the furnace wall shape of the carbonization chamber 10 with the design shape data, the deformation state of the furnace wall 13 (the unevenness of the furnace wall, the change of the furnace width) can be detected, and therefore, the furnace wall 13 can be easily repaired based on the deformation state.

[0034] On the other hand, if the furnace cover 12 of the carbonization chamber 10 is removed and the shape of the furnace wall is measured using the laser three-dimensional shape measuring device 20 installed on the platform 30, the laser irradiation hole and the detection hole will be deformed due to the radiation heat from the carbonization chamber 10, and sometimes the shape of the furnace wall cannot be measured.

[0035] Therefore, in the method for measuring the furnace wall shape of the coke oven involved in the present embodiment, the time from the removal of the furnace cover 12 of the carbonization chamber 10 to the start of the measurement of the furnace wall shape using the laser-type three-dimensional shape measuring device 20 is determined to measure the furnace wall shape of the carbonization chamber 10. When the specified time has passed since the furnace cover 12 was removed, the temperature inside the carbonization chamber 10 decreases, and the radiant heat from the carbonization chamber 10 decreases, so that the deformation of the laser irradiation hole and the detection hole can be prevented. As a result, the furnace wall shape can be measured using the laser-type three-dimensional shape measuring device 20.

[0036] Specifically, when the temperature inside the carbonization chamber 10 is 1150°C and the distance from the furnace mouth 11 to the laser three-dimensional shape measuring device 20 is 1.5m, if the laser three-dimensional shape measuring device 20 is set up for measurement 10 minutes after the furnace cover 12 of the carbonization chamber 10 is removed, the laser irradiation hole and the detection hole will not be deformed, and the laser three-dimensional shape measuring device 20 can be used to measure the furnace wall shape.

[0037] The radiant heat from the carbonization chamber 10 varies depending on the furnace temperature of the carbonization chamber 10, the time from removing the furnace cover 12 to starting the measurement, and the distance from the furnace mouth 11 to the laser three-dimensional shape measuring device 20. Therefore, when the furnace temperature of the carbonization chamber 10 is set to T W , when the time from the removal of the furnace cover 12 to the start of the measurement of the furnace wall shape is t, and the distance from the furnace mouth 11 to the laser type three-dimensional shape measuring device 20 is L, the time t and the distance L are determined so as to satisfy the following formula (1). In addition, in the present embodiment, the so-called start of the measurement of the furnace wall shape means that the laser type three-dimensional shape measuring device 20 is installed to start the measurement of the furnace wall shape, or the heat-resistant cloth of the laser type three-dimensional shape measuring device 20 insulated by the heat-resistant cloth is removed and the measurement of the furnace wall shape is started.

[0038] (10 / t) / {(L+4) / 5.5} 2 ×T W 4 ≤4.1×10 12 … (1)

[0039] Here, T Wis the temperature in the carbonization chamber 10 (K), t is the time from the removal of the furnace cover 12 to the start of measurement by the laser three-dimensional shape measuring device 20 (min), and L is the distance from the furnace opening 11 to the laser three-dimensional shape measuring device 20 (m).

[0040] By determining the time t and the distance L in this way to measure the furnace wall shape, the laser irradiation hole and the detection hole are not deformed, and the shape of the furnace wall 13 in the carbonization chamber 10 can be measured using the laser three-dimensional shape measuring device 20.

[0041] Figure 2 is a schematic diagram illustrating the radiant heat released from the carbonization chamber. Figure 2 Explanation of the above formula (1). The furnace cover 12 is provided at two locations, the coke side (the side where the coke is pushed out) and the machine side (the side where the coke is pushed out by the ejector plunger). Therefore, in order to measure the entire surface of the furnace wall 13, it is sufficient to measure from the furnace opening 11 on each furnace cover 12 side to the center 8m of the furnace wall 13. Therefore, after a specified time has passed since the furnace cover 12 was removed, the representative temperature position of the furnace temperature in the carbonization chamber 10 is considered to be the central position (4m position) of 8m in the depth direction of the carbonization chamber 10, so the radiation heat from this position is considered. Since the time of the radiation effect in the radiation heat is inversely proportional to the square of the distance, if the radiation heat at position P1 at a distance of 1.5m from the furnace opening 11 is considered as a reference, the time of the radiation effect at position P2 at a distance of L from the furnace opening 11 after 10 minutes from the removal of the furnace cover 12 can be expressed by the following formula (2).

[0042] 10 / {(L+4) / (1.5+4)} 2 … (2)

[0043] Since the amount of radiant heat is proportional to the fourth power of temperature, the following equation (3) is derived by taking into account the time from removal of the furnace cover 12 to the start of measurement by the laser three-dimensional shape measuring device 20 and the temperature inside the carbonization chamber 10 .

[0044] (10 / t) / {(L+4) / (1.5+4)} 2 ×T W 4 … (3)

[0045] The furnace temperature T W : 1150 + 273K, distance L: 1.5 m, time t: 10 minutes Substituting into the above formula (3) the calculated value is "4.1 × 10 12". As described above, if the temperature in the carbonization chamber 10 is 1150°C, the distance L is 1.5 m, and the time t is 10 minutes, the laser irradiation hole and the detection hole are not deformed. Therefore, it can be seen that by using the above formula (3) to become 4.1×10 12 The distance L and time t are determined in the following manner to measure the furnace wall shape, which can prevent the deformation of the laser irradiation hole and the detection hole, so the above formula (1) is derived.

[0046] In addition, in order to irradiate the laser 21 to the furnace wall at a height of 6 m, the laser three-dimensional shape measuring device 20 needs to be set at a distance of more than 1.5 m from the furnace opening 11. In addition, due to the size restriction of the platform 30, the laser three-dimensional shape measuring device 20 needs to be set within 3.0 m from the furnace opening 11. Therefore, the distance L from the furnace opening 11 to the laser three-dimensional shape measuring device 20 needs to satisfy the following formula (4).

[0047] 1.5≤L≤3.0…(4)

[0048] Next, the results of confirming the relationship between the furnace temperature of the carbonization chamber, the distance from the furnace port 11, and time that can prevent deformation of the laser irradiation hole and the detection hole are described. Table 1 is a table showing the values ​​of the left side of the above formula (1) under various conditions when the furnace temperature of the carbonization chamber 10 is 1150°C.

[0049] [Table 1]

[0050] As shown in Table 1, when the temperature in the carbonization chamber 10 is 1150° C., the value on the left side of the equation (1) in the black frame is 4.1×10 12 According to the results, when the temperature inside the carbonization chamber 10 is 1150°C, as long as the distance L from the furnace mouth 11 is set to be greater than 1.5m and less than 3.0m, and the time t from removing the furnace cover 12 to starting the measurement of the furnace wall shape is set to be greater than 10 minutes, the deformation of the laser irradiation hole and the detection hole can be prevented.

[0051] Table 2 is a table showing the values ​​of the left side of the above formula (1) under various conditions when the temperature in the carbonization chamber 10 is 1100° C.

[0052] [Table 2]

[0053] As shown in Table 2, when the temperature in the carbonization chamber 10 is 1100° C., the value on the left side of the equation (1) in the black frame is 4.1×10 12 According to the results, the temperature T in the carbonization chamber 10 is WWhen the temperature is 1100°C, deformation of the laser irradiation hole and the detection hole can be prevented by setting the distance L from the furnace opening 11 to 1.5 m to 3.0 m and the time t from removing the furnace cover 12 to starting the measurement of the furnace wall shape to 10 minutes or more.

[0054] Table 3 is a table showing the values ​​of the left side of the above formula (1) under various conditions when the temperature in the carbonization chamber 10 is 1000° C.

[0055] [Table 3]

[0056] As shown in Table 3, when the temperature in the carbonization chamber 10 is 1000°C, the value on the left side of the equation (1) in the black frame is 4.1×10 12 Below. According to the results, when the temperature in the carbonization chamber 10 is 1100°C, as long as the distance from the furnace mouth 11 is set to be greater than 1.5m and less than 2.5m and the time from removing the furnace cover 12 to starting the measurement of the furnace wall shape is set to be more than 10 minutes, the deformation of the laser irradiation hole and the detection hole can be prevented. Similarly, it can be seen that as long as the distance from the furnace mouth 11 is set to be greater than 2.5m and less than 3.0m and the time from removing the furnace cover 12 to starting the measurement of the furnace wall shape is set to be more than 5 minutes, the deformation of the laser irradiation hole and the detection hole can be prevented.

[0057] In addition, in the manufacture of coke, the furnace temperature of the carbonization chamber 10 is 1150°C, which is the case where the operation rate of the coke oven is 135% to manufacture coke. Here, the so-called operation rate of 135%, if it is a coke oven with 100 carbonization chambers, means the operation of pushing out 135 times in 1 day to manufacture coke. Since coke will not be manufactured with an operation rate higher than 135%, it can be said that the furnace temperature of 1150°C is the highest temperature as the furnace temperature of the carbonization chamber 10. Even at the highest furnace temperature and the shortest distance from the furnace mouth 11 of 1.5m, as long as the time from removing the furnace cover 12 to starting the measurement of the furnace wall shape is set to more than 10 minutes, the deformation of the laser irradiation hole and the detection hole can be prevented. Therefore, it can be seen that by setting the time from removing the furnace cover 12 to starting the measurement of the furnace wall shape to more than 10 minutes, the deformation of the laser irradiation hole and the detection hole can be reliably prevented.

[0058] In addition, if the furnace temperature of the carbonization chamber 10 operated at 1000°C or more is lower than 600°C, the bricks in the carbonization chamber 10 shrink and crack. Therefore, it is preferable to end the measurement of the furnace wall shape before the furnace temperature at the furnace port 11 is lower than 600°C. Therefore, the relationship between the time from the removal of the furnace cover 12 and the furnace temperature at the furnace port 11 when the furnace temperature is 1000-1150°C was confirmed. The results are shown in Table 4 below.

[0059] [Table 4]

[0060] As shown in Table 4, even when the temperature in the furnace is 1000°C (operation rate 100%), the temperature in the furnace at the furnace port 11 can be maintained at 600°C or more within 60 minutes after the furnace cover 12 is removed. According to this result, in order to prevent the temperature in the furnace at the furnace port 11 from being lower than 600°C, if the measurement time of the furnace wall shape is set to 5 minutes, it is preferred to start the measurement of the furnace wall shape using the laser three-dimensional shape measuring device 20 within 60 minutes after the furnace cover 12 is removed. As a result, even after the measurement, the temperature in the furnace at the furnace port 11 can be prevented from being lower than 600°C, and the cracking of the bricks in the carbonization chamber 10 can be prevented.

[0061] As described above, in the method for measuring the shape of the furnace wall of the coke oven according to the present embodiment, since the temperature inside the carbonization chamber 10, the time from the removal of the furnace cover 12 to the start of the measurement, and the distance from the furnace mouth 11 to the laser type three-dimensional shape measuring device are determined in a manner that satisfies the above formula (1), it is possible to prevent thermal deformation of the laser irradiation hole and the detection hole. Thus, the shape of the furnace wall of the coke oven can be measured using the laser type three-dimensional shape measuring device, and the furnace wall of the coke oven can be repaired based on the furnace wall shape data obtained by the measurement.

[0062] Example

[0063] Next, an example of measuring the shape of the furnace wall of a coke oven carbonization chamber operated at an operating rate of 120% (furnace temperature: 1100°C) using a laser three-dimensional shape measuring device is described. The laser three-dimensional shape measuring device is set at a position 1.5m away from the furnace mouth, and the time from the removal of the furnace cover to the start of the measurement of the furnace wall shape is changed to measure the shape of the furnace wall of the coke oven. The time after the furnace cover is removed, the measurement results, the results of confirming the presence or absence of damage to the device, and the value on the left side of the above formula (1) are shown in the following Table 5.

[0064] [Table 5]

[0065] As shown in Table 5, the left side of the above formula (1) is 4.1×10 12 In the following invention examples 1 to 6, the laser type three-dimensional shape measuring device was not damaged and the furnace wall shape was measured. In addition, no cracks in the bricks in the carbonization chamber of the coke oven were confirmed. On the other hand, the left side of the above formula (1) exceeds 4.1×10 12In the following comparative examples 1 and 2, deformation occurred in the laser irradiation hole and the detection hole, and the furnace wall shape could not be measured. Based on these results, it was confirmed that by determining the furnace temperature, the time from the removal of the furnace cover 12 to the measurement, and the distance from the furnace mouth in a manner that satisfies the above formula (1), it is possible to prevent the device from being damaged, thereby enabling the furnace wall shape to be measured using a laser-type three-dimensional shape measuring device.

[0066] Description of symbols 1 Coke oven 10 Carbonization chamber 11 Furnace mouth 12 Furnace cover 13 Furnace wall 20 Laser-type three-dimensional shape measuring device 21 Laser 22 Reference body 30 platforms.

Claims

1. A method for measuring the shape of a coke oven wall, comprising: setting a laser three-dimensional shape measuring device on the outside of a carbonization chamber with a furnace cover removed, and using the laser three-dimensional shape measuring device to measure the shape of the furnace wall of the carbonization chamber, wherein: The furnace wall shape is measured by determining the time from the removal of the furnace cover to the start of measurement by the laser three-dimensional shape measuring device and the distance from the furnace mouth to the laser three-dimensional shape measuring device in a manner that satisfies the following formula (1), (10 / t) / {(L+4) / 5.5} 2 ×T W 4 ≤4.1×10 12 …(1), Here, T W is the temperature inside the carbonization chamber (K), t is the time from removing the furnace cover to starting the measurement by the laser three-dimensional shape measuring device (min), and L is the distance from the furnace mouth to the laser three-dimensional shape measuring device (m).

2. The method for measuring the shape of a coke oven wall according to claim 1, wherein: The time from the removal of the furnace cover to the start of measurement using the laser three-dimensional shape measuring device is 10 minutes or more.

3. The method for measuring the shape of a coke oven wall according to claim 1 or 2, wherein: The time from the removal of the furnace cover to the start of measurement using the laser three-dimensional shape measuring device was within 60 minutes.

4. A method for repairing a furnace wall of a coke oven, comprising repairing the furnace wall of the carbonization chamber based on the furnace wall shape measured by the method for measuring the furnace wall shape of a coke oven according to claim 1 or 2.

5. A method for repairing a furnace wall of a coke oven, comprising repairing the furnace wall of the carbonization chamber based on the furnace wall shape measured by the method for measuring the furnace wall shape of a coke oven according to claim 3.

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