JP2021076285A - Inspection method and inspection device - Google Patents

Abstract

To provide an inspection method and an inspection device that accurately inspect change in state of a furnace wall.SOLUTION: There are provided an inspection method and an inspection device comprising, for inspection on a furnace wall of a boiler, a step of measuring initial information on a wall surface shape of the furnace wall from the boiler construction to a start of operation, and a step of determining a state of the furnace wall based upon the initial information. The inspection method and inspection device can accurately measure change in state of the furnace wall such as deterioration with time even if the furnace wall has a manufacture error. Consequently, it can be accurately determined whether repair is needed.SELECTED DRAWING: Figure 6

Description

The present invention relates to an inspection method for inspecting a furnace wall of a boiler and an inspection device.

Generally, a furnace wall of a boiler or the like is affected by mechanical erosion by combustion ash or fluid, or electrochemical corrosion by hydrogen sulfide or sulfate contained in combustion gas. Therefore, a method of repairing the thinning of the furnace wall due to such erosion and corrosion is being studied.
For example, Patent Document 1 discloses a method of selecting repair contents by inspecting the furnace wall at the inspection target location using the initial value and the measured value of the wall thickness or the film thickness at the inspection target location of the furnace wall. ing.

JP-A-2019-66065

However, as shown in Patent Document 1 and the like, when the furnace wall is inspected using the initial value of the wall thickness or the film thickness of the furnace wall, generally, the value described in the design drawing is used as the initial value. There is. However, a difference between the ideal value based on the design drawing and the actual size value after construction, that is, a so-called manufacturing error may occur. Therefore, if there is a manufacturing error in the furnace wall, there is a problem that the inspection is performed based on the wall thickness of the furnace wall, which is different from the actual one. Further, especially in the case of a refractory wall covering the pipeline wall, the work may be carried out at the site judgment, and there is a problem that the error from the ideal value becomes larger.

Therefore, an object of the present invention is to provide an inspection method and an inspection device for accurately inspecting changes in the state of the furnace wall.

As a result of diligent studies on the above problems, the present inventor measures the initial information on the wall shape of the furnace wall from the time when the boiler is constructed to the start of operation, and inspects the furnace wall based on the initial information to deteriorate over time. The present invention has been completed by finding that it is possible to accurately and efficiently grasp changes in the state of the furnace wall such as the above.
That is, the present invention is the following inspection method and inspection device.

The inspection method for inspecting the furnace wall of the boiler of the present invention for solving the above problems is an inspection method for inspecting the furnace wall of the boiler, and is an inspection method for inspecting the furnace wall of the boiler. It is characterized by including a step of measuring initial information and a step of determining the state of the furnace wall based on the initial information.
According to this feature, even if there is a manufacturing error in the furnace wall, changes in the state of the furnace wall such as aging deterioration can be accurately measured. This makes it possible to accurately determine the necessity of repair.

Further, according to one embodiment of the inspection method of the present invention, it is characterized by including a step of determining the priority of the inspection area or the inspection time based on the operation record information.
According to this feature, by evaluating and selecting the priority of inspection points based on the operation results, the tendency of damage to the furnace wall can be grasped, inspection and repair can be performed efficiently, and wall thinning and damage progress. It is possible to grasp the speed and determine the optimum inspection time from the next time onward.

Further, according to one embodiment of the inspection method of the present invention, the state of the furnace wall is determined by comparing the initial information with the post-operation information measured by the same means as the initial information. Have.
According to this feature, by comparing the state of the furnace wall after operation with the means for measuring the initial information of the furnace wall and the measurement result by the same means, the state of the furnace wall such as aged deterioration can be more accurately measured. You can grasp the change. This makes it possible to more accurately determine the necessity of repair.

Further, according to one embodiment of the inspection method of the present invention, the initial information is characterized by being image information obtained by a 3D scanner.
According to this feature, by using a 3D scanner as a measuring instrument for measuring initial information, the state of the furnace wall can be accurately measured and judged regardless of the surface shape of the furnace wall. Further, the inspection can be performed more quickly than in the case of using a conventional measuring instrument that moves a two-dimensional displacement meter that acquires two-dimensional information and converts it into three-dimensional information. In addition, since the frequency of moving the measuring instrument decreases every time the measurement location is changed, the inspection can be performed more efficiently.

Further, according to one embodiment of the inspection method of the present invention, the furnace wall is characterized by including a conduit wall for recovering heat from combustion exhaust gas and a refractory wall covering the conduit wall.
Conventionally, the inspection of the furnace wall mainly focuses on the pipeline wall, but according to this feature, even if there is a manufacturing error not only in the conduit wall but also in the refractory wall, the state of the wall surface Changes can be measured accurately. This makes it possible to accurately determine the necessity of repair.

Further, according to the inspection device of the present invention, an inspection device for inspecting the furnace wall of the boiler, the measuring unit for measuring the initial information of the wall surface shape of the furnace wall from the construction of the boiler to the start of operation, and the initial information. It is characterized by having a judgment unit for judging the state of the furnace wall as a reference.
According to this feature, even if there is a manufacturing error in the furnace wall, changes in the state of the furnace wall such as aging deterioration can be accurately measured. This makes it possible to accurately determine the necessity of repair.

Further, according to one embodiment of the inspection device of the present invention, it is an inspection device for inspecting the furnace wall of the boiler, and is characterized by including a 3D scanner for measuring the wall surface shape of the furnace wall.
According to this feature, by using a 3D scanner as a device for measuring initial information, it is possible to accurately measure and judge the state of the furnace wall regardless of the surface shape of the furnace wall. Further, the inspection can be performed more quickly than in the case of using a conventional measuring instrument that moves a two-dimensional displacement meter that acquires two-dimensional information and converts it into three-dimensional information. In addition, since the frequency of moving the measuring instrument decreases every time the measurement location is changed, the inspection can be performed more efficiently.

According to the present invention, it is possible to provide an inspection method and an inspection device for accurately inspecting changes in the state of the furnace wall.

It is a schematic explanatory drawing which shows the structure of the furnace which is the object of inspection of this invention. It is the schematic explanatory drawing which shows the structure of the inspection apparatus used for the inspection method of this invention. It is an enlarged explanatory view which shows the structure of the inspection apparatus used for the inspection method of this invention. It is the schematic explanatory drawing which shows the operation of the 3D scanner used for the inspection method of this invention. It is schematic explanatory drawing concerning the drive part of the inspection apparatus used in the inspection method of this invention. It is a flow figure which shows the inspection procedure of the inspection method of this invention. It is a flow chart which concerns on the 2nd step in the inspection procedure of the inspection method of this invention. It is a flow chart which concerns on the 3rd step in the inspection procedure of the inspection method of this invention.

The boiler to be inspected in the present invention is a device that generally burns fuel to heat water in a container to produce steam or hot water, and includes a furnace for burning fuel. As a typical boiler, a water pipe boiler in which the heat transfer part is a water pipe and a round boiler mainly composed of a can filled with steel water are known. In general, the furnace wall that constitutes a furnace is thinned due to fuel combustion and deterioration over time, so it is necessary to inspect it regularly and repair the thinned part by overlaying it.

FIG. 1 is a schematic explanatory view showing a configuration of a furnace. The furnace 1 includes a furnace wall 2, and the furnace wall 2 includes a conduit wall 2A and a refractory wall 2B.
The purpose of the pipeline wall 2A is to form the outer wall of the furnace 1 and to apply heat from the outside to the water flowing inside to produce steam. For example, a plurality of pipes (hereinafter referred to as "water pipes") arranged so as to extend in the vertical direction are connected by flat plate-shaped fins.
The refractory wall 2B is intended to protect the pipeline wall 2A from heat and impact caused by combustion of fuel. For example, the surface of the pipeline wall 2A may be lined with a refractory material such as concrete.

Hereinafter, embodiments of the inspection device and inspection method of the present invention will be described in detail with reference to the accompanying drawings.
[Inspection device]
First, the boiler inspection device of the present invention will be described. FIG. 2 is a schematic explanatory view showing the configuration of the inspection device 3 of the present invention.
As shown in FIG. 2, the inspection device 3 measures the state of the furnace wall 2 based on the information from the measuring unit 4 for measuring the wall surface shape of the furnace wall 2, the driving unit 5 for driving the measuring unit 4, and the measuring unit 4. A determination unit 6 for determining is provided. In addition, in FIG. 2, the arrow of the alternate long and short dash line indicates that information is input / output or is connected in a controllable manner.

(Measurement unit)
The measuring unit 4 is intended to measure the wall surface shape of the furnace wall 2. Note that FIG. 3 is an enlarged explanatory view showing a configuration in the vicinity of the measuring unit 4 in the inspection device 3 of the present invention. FIG. 3A is a schematic explanatory view showing a state in which the measuring unit 4 rises from the inside of the furnace to the wall surface of the furnace wall 2. Further, FIG. 3B is a schematic explanatory view showing the measurement sensor 43 from the upper direction of the measurement unit 4.

The measuring unit 4 includes a measuring trolley 41 that can move up and down along the furnace wall 2, a slide unit 42 that is attached between the plurality of measuring trolleys 41, and a measuring sensor that can move laterally on the slide unit 42. It has 43.
The measuring unit 4 rises in the furnace 1 along the furnace wall 2 by the driving unit 5 described later.
At that time, the measurement sensor 43 may be inspected by measuring the state of the furnace wall 2 while reciprocating in the left-right direction on the slide portion 42. In this embodiment, the one that moves the measurement sensor 43 to the left and right will be described, but the present invention is not limited to this. For example, the measurement sensor 43 may be fixedly used. In addition, by fixing the position of the measuring sensor 43 and rotating the measuring sensor 43, the wall thickness and the damaged state of the furnace wall 2 or the accumulated state of soot generated by the combustion of fuel may be measured.

As shown in FIG. 3A, the measuring carriage 41 includes four wheels 41A and a suction portion 41B at the bottom of the main body, and is attracted to the furnace wall 2 by magnetic force. Further, the wheel 41A rotates and travels on the wall surface by being pulled up by the drive unit 5 (trolley wire 52) described later. Although not shown, in the furnace wall 2, the pipe furnace wall 2A has a plurality of water pipes arranged vertically and has an uneven portion. The measuring carriage 41 of the first embodiment is configured such that the wheels 41A pass through the walls (fins) between these water pipes.

The suction unit 41B may be any means other than the above-mentioned magnetic force as long as it has a function of sucking the measuring carriage on the wall surface or the like, and is not limited to the illustrated embodiment. ..
As another example of the suction unit 41B, for example, a suction mechanism using a pushing force by blowing air, a suction mechanism using an attractive force by intake air, and the like can be mentioned.

Specific examples of the suction mechanism using the pushing force due to the blowing air include applying the pushing force to the measuring carriage 41 with a propeller or the like. As a result, it can be adsorbed on the refractory wall 2B lined with concrete made of a non-magnetic material. In addition, with the suction mechanism that uses magnetic force and attractive force due to intake, the suction force decreases when the traveling trolley moves away from the wall surface, whereas with the suction mechanism that uses the pushing force due to ventilation, even if the traveling trolley moves away from the wall surface Since the adsorption force does not decrease, there is an advantage that the risk of falling is low.

As a suction mechanism using the attractive force of the intake air, specifically, an intake device that creates a negative pressure by the intake air is provided at the bottom of the measuring carriage 41. As a result, it can be adsorbed on the refractory wall 2B lined with concrete made of a non-magnetic material in the same manner as the adsorption mechanism utilizing the pushing force of the blast. Further, as with the magnetic attraction mechanism, dust and the like are not blown up, so that there is an advantage that the inspection work is not hindered.

The slide portion 42 is installed on the upper portion (front surface in the traveling direction) of the measuring carriage 41 so as to be hung over the measuring carriage 41. The slide portion 42 is configured to move the measurement sensor 43 in the lateral direction. The means for moving the measurement sensor 43 is not particularly limited, and examples thereof include providing a rail on the slide portion 42 so that the self-propellable measurement sensor 43 moves on the rail.

By installing the slide portion 42, it is not necessary for the measuring carriage 41 to get over the water pipe of the pipeline wall 2A when the measuring sensor 43 moves in the lateral direction. As a result, the state of the conduit wall 2A in which a plurality of water pipes are provided can be quickly measured. In addition, the risk of the measuring carriage 41 falling can be reduced.
The present invention does not exclude the measuring trolley 41 from getting over the water pipe, and may be moved to another fin by providing the measuring trolley 41 with a drive mechanism for getting over the unevenness of the water pipe or the like. Further, even when measuring the state of the refractory wall 2B, even if there are irregularities on the refractory wall 2B, the measurement work can be performed quickly by avoiding the irregularities by the drive mechanism.

Further, by providing the slide portion 42, it is possible to acquire not only the information on the surface of each water pipe but also the information on the entire wall surface as one image information. For example, as shown in FIG. 3B, the measurement sensor 43 is moved along the slide portion 42 to acquire a plurality of image information at predetermined intervals. Specifically, the measurement sensor 43 is stopped at the first position to perform the first photographing, and then the measurement sensor 43 is moved along the slide portion 42 and stopped at the second position. Take 2 shots. By repeating this shooting, a wide range of image information can be acquired. When the range of the image information is narrow, it becomes difficult to fit the image to be compared when comparing the initial information before the start of operation and the information after operation. Therefore, for example, it is necessary to accurately match the measurement positions of the initial information and the post-operation information by setting a reference point or the like. On the other hand, by acquiring the information of the entire wall surface as one image information, it is possible to accurately fit the initial information before the start of operation and the information after operation, and the measurement positions of the initial information and post-operation information can be accurately measured. There is also the effect that there is no need to match. It should be noted that this effect does not exclude aligning the measurement positions of the initial information and the post-driving information with a reference point or the like.

The fitting of the image information can be performed by a known information processing means while taking into consideration the characteristic structure of the image of the entire wall surface such as the positions of a plurality of water pipes and fins and the joints of the water pipes and the amount of change. it can. Further, artificial intelligence may be used to determine the similarity between the initial information and the post-driving information to fit the image information.

The measuring sensor 43 is not particularly limited as long as it is a device capable of measuring the wall thickness and the damaged state of the furnace wall 2 or the accumulated state of soot generated by the combustion of fuel. For example, a means for acquiring three-dimensional shape information such as a 3D scanner or a displacement meter can be mentioned. As a means for acquiring three-dimensional shape information by a displacement meter, specifically, a contact type displacement meter that measures the shape of a wall surface by bringing a contactor into contact with the wall surface, or a contact type displacement meter that projects a laser beam and emits the laser beam. Laser displacement meter that measures the shape of the wall surface by receiving reflected light, ultrasonic displacement meter that measures the shape of the wall surface by transmitting ultrasonic waves and receiving ultrasonic waves reflected from the wall surface, high frequency Non-contact type displacement meters such as overcurrent type displacement meters that measure the shape of the wall surface using a magnetic field can be mentioned. The laser displacement meter has the effect of being able to detect minute changes in the wall surface shape. Since the ultrasonic displacement meter is not affected by the color and brightness of the wall surface, there is an effect that it is easy to compare the change of the initial information before the operation and the information after the operation after the operation. Further, the measurement results obtained by these may be combined with a camera image or a thermography image. The measurement by the measurement sensor also includes the measurement by remote control.

In particular, it is preferable to use a 3D scanner as the measurement sensor 43 in the present invention. The 3D scanner uses a phase shift method that has a good balance between measurement time and accuracy. However, if three-dimensional shape information can be obtained, other light cutting methods (spatial code method, stereo method), a method using the TOF principle based on the light reflection time, a laser displacement meter, a laser tracker, or the like may be used. By using the 3D scanner, the accuracy of fitting the initial information before the start of operation and the information after operation is improved. Therefore, there is an effect that the initial information and the post-driving information can be compared without accurately matching the measurement positions of the initial information and the post-driving information even in a narrow region. It should be noted that this effect does not exclude aligning the measurement positions of the initial information and the post-driving information with a reference point or the like.

FIG. 4 shows a schematic explanatory view showing the operation of the 3D scanner used in the inspection method of the present invention. For example, as shown in FIG. 4A, three-dimensional shape information of the first position and the second position is acquired by the phase shift method. Specifically, the measurement sensor 43 is fixed at the first position, and three-dimensional shape information is obtained for a predetermined range of the wall surface (first scan). Next, the measurement sensor 43 is moved to the second position, and at the second position, three-dimensional shape information is obtained for a predetermined range of the wall surface (second scan). By repeating this, image information of the entire wall surface can be obtained. For the combination of the plurality of three-dimensional shape information obtained by scanning, the horizontal position information of the slide portion 42 and the height position information (for example, the furnace bottom) by the height displacement meter (not shown) installed on the measuring carriage are used. Height position information from)) is performed based on the three-dimensional position information. Further, by placing a marker (not shown) capable of specifying a three-dimensional position within the measurement range, it is possible to accurately combine a plurality of three-dimensional shape information.
As shown in FIG. 4B, a method of swinging the measurement sensor 43 above the water pipe 21 is also conceivable, and the operation of these 3D scanners is only an example, and if three-dimensional shape information can be obtained, it is possible. There are no particular restrictions.

(Drive part)
The drive unit 5 aims to move the measurement unit 4 in the vertical direction along the furnace wall 2. Note that FIG. 5 is a schematic explanatory view showing a configuration according to the drive unit 5 of the inspection device 3 of the present invention.
As shown in FIG. 2, the drive unit 5 includes a support column 51 installed on the upper part of the furnace 1, a bogie wire 52, a support wire 53, a support column holding portion 54, and a hoisting mechanism 55 installed on the bottom of the furnace 1. ing. Further, as shown in FIG. 5, one end of the trolley wire 52 is connected to the measuring trolley 41, and the other end is wound by the winding mechanism 55 so that the measuring trolley 41 is pulled up from the bottom to the top of the furnace 1. Has been done.

Further, in the above embodiment, the measuring unit 4 is moved by the measuring trolley 41 and the driving unit 5 for moving the measuring trolley 41 in the vertical direction, but the moving means of the measuring unit 4 is particularly limited. It's not something. For example, an air vehicle capable of flying with a flying tool such as a propeller, a self-propelled measuring trolley having a driving device such as a motor, and the like can be mentioned. In the case of an air vehicle or a self-propelled measuring trolley, it is not necessary to provide a separate drive unit, so that the entire inspection device can have a simple configuration. Further, in the case of a flying object, since it has the ability to fly, there is an advantage that it can be prevented from falling even if it is peeled off from the wall surface.

(Judgment department)
The determination unit 6 aims to determine the state of the furnace wall 2 based on the initial information of the wall surface shape of the furnace wall from the construction of the boiler to the start of operation. To determine the state of the furnace wall is to determine the degree of wall thinning of the furnace wall, the damaged state such as cracks, and the uplift caused by the adhesion of soot.
The judgment unit 6 may be of any type as long as it can make the above judgment. For example, an arithmetic unit equipped with a processor such as a CPU capable of performing comparative calculations based on a program for making the above determination can be mentioned. Further, as a specific example of the determination made by the determination unit 6, for example, the initial information of the wall surface shape measured by the measurement unit 4 is compared with the information on the wall surface shape after the operation, and the difference is obtained. In addition, a change tolerance value for the wall surface shape suitable for normal use of the furnace is set in advance, and the obtained difference is compared with the change tolerance value. Here, the change tolerance refers to the wall shape of the furnace wall 2 that is suitable for the normal use of the furnace 1, and for example, the change tolerance that is the optimum wall shape for the use of the furnace. Examples include a change tolerance value, which is a wall surface shape that can be used in a furnace. The "wall surface shape" includes, for example, the wall thickness of the furnace wall 2 and the degree of damage. Then, the state of the furnace wall is determined based on the comparison result between the obtained difference and the permissible change value. In addition, based on the obtained judgment on the condition of the furnace wall, it is possible to judge whether or not repair is necessary, set the inspection time, and select the parts to be inspected with priority.
Further, the location where the determination unit 6 is installed is not particularly limited. For example, there are those that are installed integrally in the inspection device 3 and those that are connected wirelessly or in a different place physically separated from the inspection device 3.

[Inspection method]
Next, an inspection method for inspecting the furnace wall of the boiler in the present invention will be described.
The inspection method of the present invention measures the initial information of the wall surface shape from the construction of the furnace wall 2 to the start of operation, and inspects the furnace wall based on the initial information to accurately change the state of the furnace wall. And it is an efficient grasp.

FIG. 6 is a flow chart showing an inspection procedure of the inspection method of the present invention.
In the inspection method of the present invention, as shown in FIG. 6, the first step of measuring the initial information of the wall surface shape of the furnace wall 2 and the information of the wall surface shape of the furnace wall 2 after the operation (post-operation information) are measured. A second step of determining the state of the furnace wall 2 by comparing with the above initial information and a third step of determining the priority of the subsequent inspection area and the inspection interval based on the operation record information are provided.

The first step is to obtain information on the wall surface shape of the furnace wall 2 from the construction of the furnace 1 to the start of operation. Here, the information related to the wall surface shape includes, for example, the wall thickness of the furnace wall 2, the presence or absence of damage such as cracks, the accumulation state of soot due to the combustion of fuel, and the like.

In particular, it is preferable to obtain information on the wall thickness of the refractory wall 2B as information on the wall surface shape.
The refractory wall 2B is for protecting the surface of the pipeline wall 2A, and is constructed when the fire furnace 1 is constructed. The construction method is to install a wooden frame or the like around the bottom conduit wall 2A in the furnace 1 and pour a refractory material such as concrete into the surface of the conduit wall 2A. Therefore, it is difficult to build with the exact dimensions as designed. Therefore, according to the inspection method of the present invention, since the initial information before the start of operation is measured, it is possible to more accurately grasp the change in the state of the refractory wall 2B than the conventional inspection method based on the design value. Become. Further, the refractory wall 2B at the bottom of the furnace 1 is often cracked and peeled off by directly receiving the heat and impact from the combustion of fuel, and is particularly severely damaged. Therefore, it is important to perform the inspection using highly accurate information on the wall surface shape.

Next, the second step will be specifically described.
In the second step, the state of the furnace wall 2 is determined by comparing the initial information measured in the first step with the measurement result measured after the operation.

FIG. 7 is a flow chart showing the contents of the second step in the inspection procedure. First, as S2-1, the furnace 1 is operated for a certain period of time. Then, as S2-2, the information related to the wall surface shape of the furnace wall 2 is measured. Then, as S2-3, the initial information on the wall surface shape of the furnace wall 2 measured in the first step is compared with the information on the current wall surface shape. As S2-4, the state of the furnace wall 2 is determined.

S2-1 indicates that the furnace is operated for a certain period of time. There are various operating conditions for the operation of the furnace, depending on how the fuel is burned, the type of fuel, and the like.

The purpose of S2-2 is to measure information on the wall shape of the furnace wall 2 after a certain period of time has passed since the start of operation.
As a general rule, the implementation of S2-2 is preferably performed at the time of inspection stipulated by law in the operation of the furnace, but is not limited to this. For example, it may be performed before the inspection period stipulated by law in consideration of operating conditions and the like.
Here, the information related to the wall surface shape to be measured includes, for example, information related to the wall thickness of the furnace wall 2, the presence or absence of damage such as cracks, the accumulation state of soot due to the combustion of fuel, and the like. Further, the measuring method in S2-2 is preferably performed by the same method as in the first step.
As a result, changes in the state of the furnace wall such as deterioration over time can be measured more accurately, so that the necessity of repair can be accurately determined.

S2-3 compares the initial information measured in the first step with the newly measured information related to the current wall surface shape. Specifically, the determination unit 6 compares the initial information on the wall surface shape based on the first step with the information on the current wall surface shape, and obtains the difference. Further, based on the initial information measured in advance in the first step, a change permissible value that defines the permissible wall thinning of the furnace wall 2 and the degree of damage such as cracks is set. Then, the obtained difference is compared with the change tolerance value.

S2-4 determines the necessity of repairing the furnace wall 2 based on the result of the above comparison.
Here, if the difference obtained in S2-3 is within the change allowable value, the process proceeds to S2-5, it is determined that the current wall shape of the furnace wall 2 does not need to be repaired, and the inspection is completed without repairing. If the difference obtained in S2-3 is equal to or greater than the permissible change value, the process proceeds to S2-6, and it is determined that the current wall shape of the furnace wall 2 needs to be repaired, and appropriate repair is performed.
Examples of the repair performed in S2-6 include overlay welding, patching repair, and replacement of damaged parts on the pipes and fins of the pipeline wall 2A. Further, in the refractory wall 2B, for example, repairing the damaged portion by overcoating with a refractory material such as concrete can be mentioned.
Then, after the completion of S2-5 or S2-6, the process proceeds to the third step.

Next, the third step will be specifically described.
The third step is to determine the priority of the inspection area and the inspection time in the entire furnace wall 2 in the next and subsequent inspections based on the operation record information.

(Driving record information)
As the operation record information, it is possible to use the operation contents of the furnace, the history of the inspection result of the furnace wall, and the like.
For example, in addition to the operation contents of the furnace 1 or the history of the inspection results of the furnace wall 2, the operation contents of the furnace in general (information based on the accumulation of past achievements) or the history of the corresponding inspection results are accumulated. Be done. Here, the above-mentioned operation contents include an operation time, an operation period, a type of fuel used, a load, and the like. In addition, the history of inspection results includes historical information such as the wall thickness and damage status of the furnace wall by a plurality of inspections.

FIG. 8 is a flow chart showing the contents of the third step in the inspection procedure.
In the flow chart shown in FIG. 8, as in the second step, after the furnace 1 is operated for a certain period of time as S3-1, information regarding the wall shape of the furnace wall 2 is newly measured as S3-2. Then, as S3-3, the above-mentioned operation record information and the information related to the current wall surface shape measured in S3-2 are compared. Then, as S3-4, based on the result of the above comparison, the necessity of repair is determined, the priority of the inspection area is determined, or the inspection time is determined from the next time onward.

Regarding S3-1 and S3-2, it can be carried out in the same manner as in S2-1 and S2-2 in the second step. Therefore, in this embodiment, the description of S3-1 and S3-2 will be omitted.

Regarding S3-3, the operation record information (including the initial information) is used instead of the initial information in the second step. Therefore, the details of S3-3 will be omitted.

In S3-4, the priority of the inspection area after the next time or the inspection time after the next time is determined by comparing the operation record information with the information related to the current wall surface shape. As shown in FIG. 8, S3-4 is composed of S3-4-1 to S3-4-18.

In S3-4-1, as a result of comparing the operation record information with the information related to the current wall surface shape, it is determined whether or not the furnace wall 2 is thinned or damaged. As a result, if the furnace wall 2 is not thinned or damaged, the process proceeds to S3-4-2, and it is determined that repair is unnecessary and the inspection is completed. If the furnace wall 2 is thinned or damaged, the process proceeds to S3-4-3.

In S3-4-3, it is determined whether the wall thinning or damage of the furnace wall 2 is evenly generated over the entire area of the furnace wall 2. At this time, as an example of determining whether or not wall thinning and damage have occurred evenly, if the result of comparison in S3-4-1 falls within a predetermined range in the entire area of the furnace wall 2, For example, it is judged that wall thinning and damage are evenly occurring.
As a result of the above determination, if wall thinning or damage occurs evenly over the entire area of the furnace wall 2, the process proceeds to S3-4-4. If the wall thinning or damage does not occur evenly over the entire area of the furnace wall 2, it is considered that the wall thinning or damage has occurred locally, and the process proceeds to S3-4-11.

In S3-4-4, it is determined whether or not the reduction rate of the wall thickness of the furnace wall 2 is constant by comparing with the operation record information.
Here, the determination as to whether or not the rate of decrease in wall thickness is constant is performed, for example, as follows.
From the operation record information, the expected average wall thickness reduction corresponding to the operation time is obtained from the relationship between the wall thickness reduction amount of the furnace wall 2 and the inspection period interval from the past inspection history. Next, among the operation record information, the current wall thickness obtained by comparing the wall thickness of the furnace wall 2 at the time of the last inspection with the current wall thickness (information obtained in S3-2) is obtained. Then, it is determined whether or not the current thinning amount and the expected average thinning amount are equivalent. Here, when the current wall thickness reduction amount is equivalent to the above-mentioned expected wall thickness reduction amount, it is determined that the reduction rate of the wall thickness of the furnace wall 2 is constant, and the process proceeds to S3-4-5. If the current wall thickness reduction amount is not equal to the expected wall thickness reduction amount, it is determined that the wall thickness reduction rate of the furnace wall 2 is not constant, and the process proceeds to S3-4-8.

In S3-4-5, as in S2-4, it is determined whether or not the wall thickness of the furnace wall 2 and the degree of damage are within the change allowable value. Here, if the wall thickness of the furnace wall 2 and the degree of damage are within the permissible change value, the process proceeds to S3-4-6 and the inspection is completed without repair. If it is not within the permissible change value, the process proceeds to S3-4-7, and repairs such as overlay repair and patch application are performed on the thinned or damaged parts.

Similar to S3-4-5, S3-4-8 determines whether or not the wall thickness of the furnace wall 2 and the degree of damage are within the permissible change value. As a result, if the wall thickness of the furnace wall 2 and the degree of damage are within the permissible change value, the process proceeds to S3-4-9. If the wall thickness of the furnace wall 2 and the degree of damage are not within the permissible change value, proceed to S3-4-10 to repair the thinned or damaged parts by overlaying or patching. Proceed to S3-4-9.

In S3-4-9, the inspection time from the next time onward corresponding to the rate of decrease in the wall thickness of the furnace wall 2 is determined.
For example, if the current wall thinning amount is less than the above-mentioned expected wall thinning amount, the next inspection time is delayed from the scheduled inspection time. This reduces the number of inspections and enables efficient operation of the furnace. If the current wall thinning amount is larger than the above-mentioned expected wall thinning amount, the next inspection time will be earlier than the scheduled inspection time. This makes it possible to prevent damage to the furnace wall 2 in advance.

In S3-4-11, the location where the wall thickness or damage has occurred is specified for the entire furnace wall 2. In S3-4-11, any means may be used as long as the place where the wall thinning or damage has occurred can be identified. For example, the number of measurement points (resolution) may be increased. Further, based on the result in S3-4-3, the range where the wall thinning or damage has occurred may be specified, and further, the result by tactile finger or visual inspection may be combined to specify. This enables more accurate identification.

In S3-4-12, it is determined in the same manner as in S3-4-4 whether the rate of decrease in the wall thickness of the furnace wall 2 is constant. Here, if the rate of decrease in the wall thickness of the furnace wall 2 is constant, the process proceeds to S3-4-13. If the rate of decrease in the wall thickness of the furnace wall 2 is not constant, the process proceeds to S3-4-16.

In S3-4-13, it is determined whether or not the wall thickness of the furnace wall 2 and the degree of damage are within the permissible change value by the same method as in S3-4-5. Here, if the wall thickness of the furnace wall 2 and the degree of damage are within the permissible change value, the process proceeds to S3-4-14. If it is not within the permissible change value, the process proceeds to S3-4-15, and after repairs such as overlay repair and patch application are performed on the thinned or damaged parts, the process proceeds to S3-4-14.

In S3-4-14, the priority of the inspection area to be inspected from the next time onward is determined based on the information such as the place where the wall thinning or damage has occurred specified in S3-4-11. For example, in the next and subsequent inspections, the inspection may be performed more intensively, such as by combining a plurality of inspection means, with the portion where the wall thickness or damage has occurred as a high priority area for inspection.

In S3-4-16, it is determined whether or not the wall thickness of the furnace wall 2 and the degree of damage are within the permissible change value by the same method as in S3-4-5. Here, if the wall thickness of the furnace wall 2 and the degree of damage are within the permissible change value, the process proceeds to S3-4-17. If it is not within the permissible change value, the process proceeds to S3-4-18, repairs such as overlay repair and patch application are performed on the thinned or damaged parts, and then the process proceeds to S3-4-17.

In S3-4-17, the priority of the inspection area to be inspected from the next time onward is determined based on the information such as the location of the wall thinning specified in S3-4-11, and the meat of the furnace wall 2 is determined. Determine the next and subsequent inspection times corresponding to the rate of decrease in thickness. As a result, it is possible to determine a more optimal inspection location and time, and to make a more effective repair plan, so that it is possible to improve the operational efficiency related to the operation of the reactor 1.

In the third step, by evaluating and selecting the priority of the inspection area based on the operation results, the tendency of damage to the furnace wall can be grasped, the inspection and repair from the next time onward can be performed efficiently, and the wall thickness can be reduced. It is possible to grasp the progress rate of damage and to determine the optimum inspection time from the next time onward. In particular, it is possible to determine the optimum inspection time and inspection area corresponding to the change in the wall shape of the furnace wall due to the change in the operating conditions such as the change in the fuel used and the change in the combustion time.

The above-described embodiment shows an example of an inspection method and an inspection device for the furnace wall of the boiler. The method and apparatus for inspecting the boiler wall of the boiler according to the present invention are not limited to the above-described embodiment, and the boiler wall of the boiler according to the above-described embodiment is not changed as long as the gist described in the claims is not changed. The inspection method and the inspection device may be modified.

For example, by evaluating and selecting the priority of the inspection area based on the operation results, the tendency of damage to the furnace wall can be grasped, and the repaired part of the boiler wall can be predicted in advance before the inspection. It is possible to improve the accuracy of the repair work plan at the time.

Further, for example, the operation record information used in the third step in the inspection method of the present embodiment may use information related to the wall surface shape that can be estimated from the shape of the furnace, the fuel used, the operation period, and the like. As a result, even when the operation time from the start of operation is relatively short and the information as the operation record is small, it is possible to perform the inspection using highly accurate information.

The inspection method and inspection device of the present invention can be applied to the inspection of a boiler. Specifically, it can be suitably used for inspecting the furnace wall of a boiler.

1 ... Fire furnace, 2 ... Fire furnace wall, 2A ... Pipe wall, 2B ... Fireproof wall, 3 ... Inspection device, 4 ... Measurement unit, 41 ... Measurement trolley, 42 ... Slide part, 43 ... Measurement sensor, 41A ... Wheel, 41B ... Suction part, 5 ... Drive part, 51 ... Support, 52 ... Bogie wire, 53 ... Support wire, 54 ... Support holding part, 55 ... Winding mechanism, 6 ... Judgment part

Claims (7)

It is an inspection method to inspect the furnace wall of the boiler.
The step of measuring the initial information of the wall shape of the furnace wall from the construction of the boiler to the start of operation, and
The step of determining the state of the furnace wall based on the initial information, and
An inspection method characterized by being provided with. The inspection method according to claim 1, further comprising a step of determining a priority of an inspection area or an inspection time based on operation record information. The inspection according to claim 1 or 2, wherein the state of the furnace wall is determined by comparing the initial information with the post-operation information measured by the same means as the initial information. Method. The inspection method according to any one of claims 1 to 3, wherein the initial information is image information obtained by a 3D scanner. The inspection method according to any one of claims 1 to 4, wherein the furnace wall includes a pipeline wall that recovers heat from combustion exhaust gas and a refractory wall that covers the pipeline wall. It is an inspection device that inspects the furnace wall of the boiler.
A measuring unit that measures the initial information on the wall shape of the furnace wall from the time the boiler is constructed to the start of operation,
A judgment unit that determines the state of the furnace wall based on the initial information,
An inspection device characterized by being equipped with. It is an inspection device that inspects the furnace wall of the boiler.
An inspection device including a 3D scanner that measures the wall surface shape of the furnace wall.

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