JPH0718687B2 - Coke oven furnace wall crack measurement method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for measuring a width dimension of a crack, particularly a through crack, generated in a partition wall that separates a combustion chamber and a carbonization chamber in a coke oven.

[Prior Art] Generally, in a coke oven, coal is charged into a carbonization chamber and carbonized to produce coke, but the partition wall between the carbonization chamber and the combustion chamber is repeatedly exposed to a high temperature of 800 to 1200 ° C or higher. In addition, when ejecting coke, repeated impacts are applied by contact with coke, so that damages such as cracks, joint breaks, cuts, and depressions are likely to occur in the partition walls. It is important to close and repair the black smoke emitted from the top or from the carbonization chamber to the combustion chamber to prevent black smoke emission.

By the way, various repair methods for cracks in partition walls have been proposed, but recently, fine particles of metal or metalloid are sprayed together with an oxidizing gas as a repair material, and the heat generated at that time damages the repair material. Method of sintering and adhering to the part, or plasma gas is generated by working gas in which N ₂ is added to Ar gas, and while heating the furnace wall by this plasma jet, powder of refractory material such as ceramics is sprayed as repair material. Methods etc. have been proposed and implemented.

FIGS. 4 (a) and 4 (b) are schematic views showing a repair mode for cracks in the partition wall by the conventional plasma spraying method, which are generated in the partition wall 13 between the combustion chamber 11 and the carbonization chamber 12 of the coke oven 10. When repairing cracks, the water cooling lance 4 containing a repair material injection device such as a plasma spray gun 4i together with a furnace observation device such as an illumination lamp and a TV camera is dropped into the carbonization chamber 12 from the charging port, and the TV camera is installed. Plasma spraying is performed aiming at the cracks 14 while catching the cracks 14, and the repair material F is sintered and adhered to the cracks 14 to be filled and repaired.

[Problems to be solved by the invention]

By the way, in the method as described above, the cracks are detected and repaired from within the carbonization chamber 12, but the carbonization chamber of the partition wall 13 is detected.
The surface on the 12th side has a large amount of carbon attached, making it difficult to detect cracks accurately, and it is not possible to determine whether a crack is a through crack reaching the combustion chamber. Could not be repaired. Further, when the crack 14 to be repaired is a through crack that reaches the combustion chamber 11 from the carbonization chamber 12, even if the repair material F is emitted by the spray gun 4i, the repair material F
Since most of them are blown to the side of the combustion chamber 11, the adhesion rate to the crack surface is low, and the repair material F is wasted a lot, which requires a long time for repair. Moreover, when the injection amount of the repair material F is increased, as shown in FIG. 4 (B), the repair material F is passed like a skin only to the crack opening, and the crack 14 cannot be filled.
Complete repairs are difficult, and there are many drawbacks such as cracks often recurring in a short time.

As a countermeasure for this, the injection conditions of the repair material are changed and the injection is performed according to the dimensions of the crack, especially the width, but in the past, there was no accurate method for measuring the width of the crack, which was the premise. There was a problem that it had to depend on the experience of the person.

The present invention has been made in view of such circumstances, the purpose is to quantitatively grasp the damage situation of the partition wall,
It is to provide a method for measuring cracks in a coke oven furnace wall that enables efficient and efficient repair.

[Means for solving problems]

In the method of the present invention, by inserting an observation device into the combustion chamber, since the occurrence of cracks occurs from the carbonization chamber side where the temperature change and impact are large, it is possible to detect a crack on the combustion chamber side by a through crack. Or not. Then obtain an image of the cracks in the partition wall and the refractory bricks in the vicinity thereof in one screen, and based on the facing angle of the observation device, correct the image to an image obtained by directly facing the observation device to the partition wall. ,
Based on this corrected image, the width dimension of the crack is detected with the width dimension of the refractory brick as a reference length, and the repair condition is determined based on the detection result.

[Action]

In the method of the present invention, since the width dimension of the crack is relatively determined with respect to the reference length of the refractory bricks in the vicinity thereof by this, the error is small, and the crack can be accurately grasped. Can be done efficiently and quickly without waste.

〔Example〕

Hereinafter, the method of the present invention will be specifically described with reference to the drawings showing an embodiment thereof.

FIG. 1 is a schematic cross-sectional view showing an embodiment of the method of the present invention, and FIG. 2 is a block diagram of the same. In the drawing, 1 is a water cooling lance, 2 is a detection carriage, 3 is a measuring device main body, and 10 is a coke oven. Is shown.

The coke oven 10 is provided with a plurality of combustion chambers 11 and carbonization chambers 12 alternately with a partition wall 13 separating the combustion chambers 11 from each other.
The water cooling lance 1 supported by the detection carriage 2 is lowered from the inspection port 11a opening in the upper part of the inside 11. Water cooling lance 1
Is a holding part 2b on an elevating guide 2a standing on the front end of the detection carriage 2.
It is supported via a shaft and is rotated up and down along the elevating guide 2a by a drive unit (not shown) provided in the holding unit 2b and can be rotated around the axis.

As shown in FIG. 2, the water cooling lance 1 has an inner and outer double cylinder structure, and is provided with a cooling water passage 1c between both cylinders 1a and 1b, and a window 1d, This window equipped with 1e 1
An illuminating lamp 1f constituting the in-core observation device is arranged facing the d, and a mirror 1g is also arranged facing the window 1e, and a television camera 1h is built above the mirror 1g so as to face the mirror 1g. .

In the detection cart 2, the water cooling lance 1 is charged into the combustion chamber 11 of the coke oven 10 through the inspection port 11a, and the light of the illumination lamp 1f is passed through the window 1d while changing the charging depth and the rotation angle around the axis. The reflected light is projected on 13, and is imaged by the television camera 1h through the window 1e and the mirror 1g, and the partition walls 13 on both sides are scanned to detect the crack automatically or while observing it on a monitor. When the crack 14 is imaged, the magnification is set so that the entire width (for example, the width dimension in the upward and downward directions) of the refractory brick 13a can be captured together with the crack in the same image.

The crack 14 is detected from the combustion chamber 11 side because the crack 14 usually occurs from the carbonization chamber 12 side to the combustion chamber 11 side in most cases, and therefore the crack that is open to the combustion chamber 11 side. The reason is that most of them are through cracks, and that the carbonization chamber 12 has a large amount of carbon adhering to the wall surface, and it is often difficult to recognize the width of the cracks.

When the observation device of the water cooling lance 1 is imaged in a state where the observation device of the water cooling lance 1 faces the partition wall, the image input to the storage device 4 is, for example, the left and right vertical widths of the refractory brick 13a.
▼ and ▲ ▼ are equal (▲ ▼ = ▲ ▼),
When the water cooling lance 1 itself is not directly facing, that is, when the water cooling lance 1 itself is rotated by a required angle around its axis, the partition wall 13
Since the scale ratio of is different on the left and right (AB ≠ CD),
This is input to the compensator 5, and the rotation detector 5a of the water cooling lance 1
Based on the output of 1.

This correction is performed as follows, for example.

FIG. 3 is an explanatory diagram when the image pickup direction of the television camera with respect to the partition wall is non-perpendicular, and the television camera is rotated by the rotation (angle: θ ₀ ) of the water cooling lance 1 about the axis line.
As a result of the center of the field of view moving to the left by θ ₀ from the state directly facing, the line segment η extending in the left and right directions on the partition wall 13 is represented as having a length of ξ on the monitor image.

The line η is an angle θ with respect to the objective lens of the television camera.
The origin is 0 at the center of the monitor screen, the horizontal axis is x (horizontal width of the monitor: 2x ₀ , and the vertical axis is y (vertical width of the monitor: 2y ₀ ), which can be expressed as the following equation (1).

However, x ₀ : 1/2 of the width of the monitor screen α: 1/2 of the horizontal viewing angle of the TV camera Therefore, the position (x, y) on the screen and the position (x ′, The relational expression with y ') is expressed as the following expressions (2) and (3).

Therefore, if the rotation angle θ ₀ of the water cooling lance 1 is obtained by the angle detector 5a, the x ′ and y ′ positions can be obtained according to the equations (2) and (3).

The image corrected by the corrector 5 is stored in the storage device 6, but this image has a width above and below the refractory brick 13a.
The image has the same ▼ and ▲ ▼ ((▲
▼ = ▲ ▼) Based on the corrected image, the calculator 7 calculates the width of the crack 14 at substantially constant intervals in the longitudinal direction of the crack 14 with reference to the refractory brick width d ₀ .

In this calculation process, the crack 14 of the partition wall 13 is usually formed in the vertical direction by the force at the time of coke discharge, and the brightness of the crack 14 and the brick joint portion 13b on the screen is larger than that of the brick surface. It is carried out as follows by taking advantage of the fact that it is low.

That is, first, the brightness density of the screen is reversed and the joint portion 13b and the crack 14 are
Is set to be slightly brighter than the others, and then the average brightness level of the entire screen is obtained. Next, if a fixed threshold value, for example, 1.1 times the average value is set based on this average value and the screen brightness is binarized, only bright joints 13b and cracks 14 remain as an image.

Next, leaving only the image of the joint portion, the average value of the luminance adjacent in the horizontal direction is taken to erase the others, and the line in the vertical direction or in the direction close to this is erased. As a result, only the horizontal line corresponding to the horizontal joint portion 13b of the brick 13a remains on the screen, so if the dimension between the upper and lower parallel lines is measured, the brick 13
The height method of a, that is, the reference length is obtained. The brick 13a usually has a vertical width of about 100 mm and its dimensional specifications are known.

Next, the crack 14 takes an average value between pixels adjacent in the vertical direction and erases a line in the horizontal direction and a line close to the average value, in substantially the same manner as the method for obtaining the joint portion.

As a result, only the cracks 14 in the vertical direction and the cracks close thereto are left, and the line width thereof is determined at regular intervals in the vertical direction, and converted to the actual size of the reference value d ₀ which is the vertical width of the refractory brick previously obtained.

At this time, a joint portion in the vertical direction of the refractory brick appears in addition to the crack 14, and the joint width is also obtained. However, a crack or a portion having a normal joint width or more can be determined as a crack or a joint break.

When the width dimension of the crack is obtained in this manner, a predetermined spraying condition or the like which is most desirable for filling and repairing the crack based on the width dimension is set and repaired.

〔effect〕

As described above, in the method of the present invention, cracks of the partition wall obtained by charging the observation device into the combustion chamber are obtained in a single image together with refractory bricks, and the observation device is directly attached to the partition wall. Correct the image obtained when paired, and measure the width dimension of the crack with the width dimension of the refractory brick in the image as the reference length based on the corrected image, so that the crack itself can be detected accurately Of course, without being affected by image magnification, distortion, etc., accurate and high measurement accuracy can be obtained, and cracks can be quantitatively grasped easily, setting repair conditions according to each, and more accurate The present invention has excellent effects such that the life of the furnace can be estimated and stable operation can be achieved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an implementation state of the method of the present invention, FIG. 2 is a block diagram of an apparatus for similarly implementing the method of the present invention, FIG. 3 is an explanatory view showing a mode of correction, FIG. 4 (a), (B) is an explanatory view showing a conventional crack repair mode. 1 ... Water cooling lance, 2 ... Detection cart, 3 ... Measuring device main body, 4
... memory device, 5 ... compensator, 6 ... memory device, 7 ... calculator, 10 ...
Coke oven, 11 ... Combustion chamber, 12 ... Carbonization chamber, 13 ... Partition wall, 14 ...
crack

Claims (1)

[Claims] 1. An observation device is inserted into a combustion chamber of a coke oven to obtain an image including cracks of a partition wall with a carbonization chamber and refractory bricks in one screen, and this image is taken by an observation device for the partition wall. After correcting to the image when obtained by facing the observation device to the partition wall based on the facing angle, the width dimension of the crack is detected with the width dimension of the refractory brick in the image as the reference length, and the repair condition based on this detection result A method for measuring cracks in the wall of a coke oven, characterized by: