JP2004211991A - Clinker amount measuring device for dry ash conveyor - Google Patents

Abstract

An object of the present invention is to provide a simple clinker amount measuring device for accurately grasping and presenting a clinker accumulation amount on a dry ash conveyor disposed at the bottom of a power generation boiler, and using a conventional monitoring device. Provided is a clinker amount measuring device that can be configured at low cost.
A camera installed at the end of a dry ash conveyor and taking an image in the traveling direction of the conveyor and an image processing device for inputting an output of the camera and performing image processing are provided. By performing image processing such as a difference on the captured images 41 and 43, changes 53 and 545 in the deposition state at specific positions 51 and 52 are detected, and the deposition amount of the clinker is estimated.
[Selection diagram] Fig. 4

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a clinker amount measurement device that manages the amount of clinker conveyed by a conveyor, and particularly to a clinker amount measurement device for a dry ash conveyor that carries out clinker deposited on a furnace bottom of a coal-fired power generation boiler.
[0002]
[Prior art]
In a coal-fired boiler, ash must be removed during operation of the boiler.At this time, if air enters from the bottom ash outlet of the boiler, the efficiency of the boiler will be reduced. is necessary. A commonly used method of ash removal is to provide an opening in the bottom of the boiler furnace, install a water tank below it, receive the clinker that has fallen into the furnace bottom, seal it with water, cool it, and remove the cooled clinker from the bottom. This is a wet ash removal method in which the material is carried out by a conveyor or pumped by a water injection pump. However, the wet ashing method is inefficient because water treatment and auxiliary power are expensive.
[0003]
Therefore, a dry treatment method has been developed in which clinker deposited on the furnace bottom is directly carried out by a dry ash conveyor.
In this method, a pit is formed at the bottom of the boiler, and the boiler apparatus is provided with a dry clinker conveyor disposed at the bottom of the pit. The dry clinker conveyor can be rotated by laying a metal plate on a conveyor belt formed of a metal mesh so as to be slidable with each other without any gap so that clinker ash does not spill down and the rollers at the end of the conveyor are wound. It can withstand high temperature clinker.
[0004]
Also, a narrow tunnel is provided at one end of the pit, and one end of the clinker belt enters into the tunnel to drop clinker ash into a discharge hopper provided at the end of the clinker conveyor. A pulverizer is provided at the bottom of the discharge hopper, and after adjusting the clinker ash particle size, it is dropped to the next conveyor. Even when clinker ash is carried out, the bottom of the boiler can be kept airtight by the tunnel and hopper.
When coal is burned in the boiler, clinker generated in the furnace accumulates on the dry ash conveyor at the bottom of the pit, so that the conveyor is operated at an appropriate time and carried out of the boiler for processing.
[0005]
However, since the properties and amount of clinker vary depending on the type of coal and the amount of power generated, unless the operation interval is adjusted according to the situation, the amount of unloading will be excessive, and equipment such as crushers installed downstream will be too large. Either the load becomes excessive, or the efficiency is reduced due to an insufficient amount. Until now, workers have monitored clinker accumulation on dry ash conveyors and manually operated the conveyors. Therefore, there has been a demand for automating these manual operations.
[0006]
As a measuring device for measuring a deposition state on a conveyor, for example, there are devices disclosed in Patent Literature 1 and Patent Literature 2.
The apparatus disclosed in Patent Literature 1 manages combustion by measuring the thickness of a dust layer in a stoker incinerator that burns garbage and the like. Garbage and the like supplied by the supply feeder are dried by radiant heat in the furnace, and then ignited and burned. Conventionally, the amount of garbage supplied is determined using the optimum amount obtained in the test operation. However, it is necessary to control the thickness of the garbage layer in order to continuously perform processing. The device disclosed in this document is provided with a laser source and a laser detector at a position facing the dust layer, irradiates a laser having a wavelength avoiding the wavelength of the flame, and observes reflected light, whereby a device under the flame is exposed. The height or shape of the dust layer is measured. It is said that efficient combustion can be achieved by adjusting the dust supply amount, stoker speed, air supply amount, etc. by finding the shape of a wide range of dust layers by using multiple measurement positions and three-dimensional laser scanning to determine the shape of the dust layer over a wide range. ing.
[0007]
In addition, the apparatus disclosed in Patent Document 2 monitors an object being transported by observing a light-cut surface formed by irradiating a laser beam almost vertically from above the conveyor with a television camera, thereby observing an object being transported. It has been developed especially for the purpose of applying to a supply conveyor to maintain a constant furnace load in a garbage incinerator or the like or to adjust combustion conditions according to the load. A device that can accurately detect the height and instantaneous change in the amount of material conveyed on the conveyor by solving problems such as the conventionally used measuring conveyor and the conveyor with the accumulation level detection using photoelectric elements. It is said that there is.
[0008]
However, in the ash extraction device of a coal-fired boiler using a dry clinker conveyor, a sensor that can be installed because the bottom of the boiler is long and rectangular, the length of the dry ash conveyor reaches several tens of meters, and the inside of the boiler is extremely high temperature. There are conditions such as restrictions on the installation position, space, and the like, and restrictions on the wavelength of the light beam to be used because the coal ash to be measured is at a high temperature. In order to apply the above disclosed method to such a conveyor, it is necessary to attach a strict cooling device to the laser device and the detector, and it is necessary to install an extremely large number of measuring devices from a measuring range per set. There are practical difficulties.
[0009]
[Patent Document 1]
JP-A-2000-283443
[Patent Document 2]
JP-A-5-306909
[0010]
[Problems to be solved by the invention]
Therefore, the problem to be solved by the present invention is to provide a simple clinker amount measuring device that accurately grasps and presents the clinker accumulation amount on a dry ash conveyor disposed at the bottom of a power generation boiler, Another object of the present invention is to provide a clinker amount measuring device that can be configured at low cost by using a conventional monitoring device.
[0011]
[Means for Solving the Problems]
A clinker amount measuring device for a dry ash conveyor according to the present invention includes a camera installed at an end of the conveyor for photographing in the traveling direction of the conveyor, and an image processing device for inputting an output of the camera and performing image processing, and the clinker on the conveyor. By performing image processing on a video image of the ash state, a change in the accumulation state at a specific position is detected to estimate the amount of accumulation.
[0012]
For example, by observing the position of the top surface of the clinker ash with respect to the side wall of the pit containing the conveyor, the amount of clinker ash deposited can be accurately estimated. When the amount of clinker ash deposited exceeds a predetermined value, the conveyor control device can be operated to drive the conveyor and automatically remove the clinker.
Also, observe the surface profile of the clinker ash against the discharge port at the outlet of the pit where the conveyor carries out the clinker ash, and operate the conveyor before excessive deposition to cause clinker ash in the discharge port and discharge path. Can be prevented from being clogged.
Also, if clinker ash or the like accumulates abnormally in front of the camera's field of view, a dark shadow appears at the bottom of the screen. By observing this, an abnormal state is detected, and the worker is notified and prompted for processing. be able to.
[0013]
The images at each position as described above can be acquired at once using a single camera installed above the end of the conveyor, so it is necessary to perform image processing suitable for each position. Information can be formed.
An image in a state where the clinker is thinly deposited on the conveyor immediately after the clinker is discharged is stored as an initial image, and a difference between the image at the time of measurement and the initial image is obtained, thereby estimating a deposition amount. Objects other than the clinker ash that accumulates over time do not change in the image, and thus are canceled out by taking a difference, and the obtained difference image indicates an increase in the clinker ash. For example, by observing the edge of the clinker, the amount of deposition can be known based on the increase in the height of the edge.
[0014]
However, the screen is larger in front according to the perspective, and smaller the further away, the user must pay attention to scale conversion based on the distance. However, usually, the ash fall state of the clinker is almost the same in the longitudinal direction of the conveyor, so in order to estimate the amount of deposition on the conveyor, it is necessary to cut out an appropriate area of the pit side wall and observe the clinker surface position. Is enough.
Therefore, if the field of view of the camera is fixed, it is possible to estimate the amount of clinker deposited on the conveyor by trimming a certain area in the captured screen and performing difference processing, and observing the increase in the height of the clinker surface. it can. In order to confirm the position of the calculation area, it is preferable that the cutout area can be corrected by paying attention to the positions of beams, partitions, and the like appearing in the image on the screen.
[0015]
Also, since the outlet of the pit is dark, the surface of the clinker ash deposited at the position of the dark opening is captured, and when the average height exceeds a predetermined height, the conveyor is operated, Preferably, no further clinker ash is deposited.
The average surface height of the clinker ash at the outlet is obtained by taking a difference image for the cut-out portion of the outlet, detecting the contour by taking the difference between adjacent pixels, and projecting this value on the Y axis. Thus, a Y-axis projection is formed, and it can be determined from the height at which the peak occurs. Specifically, for each pixel in the image in the area, a difference value of a density signal with an adjacent pixel is obtained to detect a contour, and the contour is detected in the horizontal direction, that is, for each of the same Y values, and is integrated and developed on the Y axis. The Y-axis projection can be obtained by a method or the like.
Further, the dark portion before the image can be detected by image processing limited to the lower center position of the screen, and an alarm may be generated when the detected highest position of the dark portion exceeds a predetermined threshold.
[0016]
In addition, the clinker ash soars at the bottom of the boiler and obstructs the field of view, or the outline becomes unclear, so that the ridge line of the clinker ash cannot be clearly detected. In the image processing at the pit outlet, the determination is made using the value of the Y-axis projection of the differential image. When dust is generated and impairs the visual field, the projection value decreases, and when the boundary is clear, the projection value increases. Therefore, when the Y-axis projection is not equal to or more than the predetermined value, the contour image is unclear and the reliability of the measurement is likely to be low. Therefore, it is preferable not to use the measurement result.
[0017]
In addition, if the installation position of the camera fluctuates due to vibration or aging, the area to be photographed changes, causing an error in the position measurement result on the clinker surface. Therefore, by specifying a specific part in the camera's field of view, the position where this part is reflected is detected by pattern matching, an error with the initial position is calculated, and the image on the screen is calculated based on the detected error. Can be corrected. Further, the viewing direction and the installation position of the camera may be adjusted based on this error.
The measurement result may be displayed in a form that is intuitive and easy to understand, such as not only numerical display but also a graph showing a change over time.
[0018]
During operation of the boiler, the clinker adheres to the inner wall of the boiler and develops, which may be peeled off and fall as a lump on the conveyor. Depending on the size of the lump, it is necessary to perform processing such as immediate discharge. Therefore, it is preferable to provide a mechanism for detecting and warning when a large lump falls on the conveyor. The clinker amount measuring device of the present invention inputs an output image of a camera at a predetermined interval, generates a difference image from a saved image before an appropriate time when a new image is obtained, and sets the difference image to an appropriate threshold value. If the obtained binarized image has an image larger than a predetermined area, a mechanism for estimating that an abnormal change has occurred and issuing a warning can be attached.
When such an abnormal change is detected, it is preferable that some images before that are recorded and recorded so that they can be reproduced and observed as a still image or a moving image. When an operator misses an event, it can be reproduced and confirmed. If the recording screen is recorded as digital data on a random-accessible recording medium such as a hard disk or a DVD, there is an advantage such that cueing is easy during reproduction.
[0019]
The clinker amount measuring device for a dry ash conveyor according to the present invention is economical using the video output of a conventional conveyor monitoring camera for monitoring the operating state of a dry clinker conveyor installed at the bottom of a coal-fired boiler. It can be configured in a typical manner. The video output of the camera is input to the image processing device, which generates the necessary information using image processing technology and displays it on the display device to assist the operator in making decisions, or through the input / output device. To a conveyor controller for automatic operation of the conveyor.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a clinker amount measuring device for a dry ash conveyor according to the present invention will be described in detail using embodiments.
FIG. 1 is a block diagram of a clinker amount measuring apparatus according to the present embodiment, FIG. 2 is an explanatory diagram of a configuration of a bottom portion of a boiler showing an arrangement of the imaging apparatus, FIG. 3 is an example of an image captured by a camera, and FIG. FIG. 5 is a video diagram illustrating a procedure for measuring, and FIG. 5 is a video diagram illustrating a procedure for detecting a clinker deposition state near a discharge opening by image processing. FIG. 6 is a flowchart illustrating a procedure for detecting a clinker deposited on a front surface of a camera. FIG. 7 is a video diagram for explaining the procedure for detecting the fall of the clinker block.
[0021]
As shown in FIG. 2, the clinker amount measuring device of the present embodiment is used for measuring the state of clinker ash deposition on a dry clinker conveyor also called a dry ash conveyor provided at the bottom of a furnace of a coal-fired power boiler. Is what is done.
The coal-fired boiler to which the present invention is applied has a furnace 10 having a length of about 24 m, a pit 12 provided below a barrel 11, and a transition hopper 13 provided between the barrel 11 and the pit 12 of the furnace. At the bottom of the pit 12, a dry clinker conveyor 21 that is transported and moved in the longitudinal direction is provided.
[0022]
The dry-type clinker conveyor 21 uses a heat-resistant belt in which a metal plate is fixed to a metal mesh so that adjacent metal plates are slidable, and is sufficiently resistant to high-temperature clinker ash and radiant heat from a furnace.
The conveyor belt of the dry clinker conveyor 21 is laid so as to cover the entire area from one end to the other end of the ceiling opening of the pit 12, and further passes through the tunnel 15 from the unloading opening 14 provided at one end of the pit 12. To the hopper 16. The hopper 16 is provided with a crusher, under which a conveyor 22 is provided. At the ceiling of the pit 12, beams 18 and 19 are provided at appropriate intervals to reinforce the strength, and the opening is divided into several by the beams.
[0023]
A monitoring TV camera 17 is provided on a side portion of the transition hopper 13 so that a pattern of ash fall can be observed. This monitoring camera 17 is used independently of the present embodiment.
A conveyor image acquisition TV camera 31 is provided on the upstream side of the ash conveyor of the pit 12 to acquire an image of the ash conveyor 21 in the pit 12 as viewed in the belt moving axis direction. The clinker ash accumulation state can be displayed so as to be monitored, and a video signal is supplied to the clinker amount measuring device 30 shown in FIG.
[0024]
FIG. 3 is a diagram showing an example of a video image acquired by the TV camera 31 for acquiring a conveyor image. In the acquired video screen 40, the upper surface of the dry ash clinker conveyor 21 extending far below the center to the carry-out opening 14 is shown, and on both sides thereof, inclined movable walls of the pits 12 appear. On the walls of the pits 21, seams and irregularities of the walls, or spots of light and darkness appear. Also, beams 18 and 19 on the ceiling of the pit 12 are shown in the upper half of the screen 40.
[0025]
As shown in FIG. 1, the clinker amount measurement device 30 includes an image processing device 32, a calculation device 33, an input / output device 34, and a display device 35. The clinker amount measurement device 30 captures the video output of the TV camera 31 and performs a predetermined calculation process. Then, the amount of clinker on the conveyor is estimated, and when necessary, the conveyor control device 36 is operated to drive the conveyor 21.
The image processing device 32 receives the signal output of the TV camera 31, performs predetermined image processing, generates information necessary for calculating the amount of clinker, and supplies the information to the arithmetic device 33 to evaluate the deposition state. The result is displayed on the display device 35 and sent to the conveyor control device 36 via the input / output device 34.
Upon receiving the discharge command signal, the conveyor control device 36 automatically starts the dry ash conveyor 21 and unloads the load at a speed of approximately 20 mm / s. The carried-out object carried out is further adjusted in particle size by a crusher, and then conveyed to a next step (not shown) by the conveyor 22.
[0026]
FIG. 4 is a diagram illustrating a procedure for measuring the thickness of the clinker ash deposited on the conveyor by the clinker amount measuring device of the present embodiment.
In the coal-fired boiler, the clinker ash generated and descending in the furnace shell 11 is guided by the transition hopper 13 and accumulates on the conveyor 21.
First, the clinker amount measuring device installed in the coal-fired boiler stores an image photographed by the camera 31 before clinker ash or the like is deposited on the conveyor 21 in a storage device. As shown in FIG. 4A, the clinker ash 42 projected on the screen 41 is deposited so as to cover the entire surface of the conveyor 21 thinly. It should be noted that the figure shows a conceptually simplified image to be obtained.
[0027]
The camera 31 continuously acquires images, and sends image signals to the image processing device 32 at appropriate intervals. As shown in FIG. 4 (b), the clinker ash 44 on the conveyor 21 accumulates over time and the surface rises, and in particular, gradually covers the pit side walls, thereby forming a marked covering portion. Form.
The image processing device 32 generates a difference screen 45 by taking the difference between the input screen 43 and the previously stored initial screen 41. Objects that do not change over time in the field of view are reflected on both the initial screen 41 and the appropriately input screen 43, and are canceled out by taking the difference between the two. Therefore, the image of the structure such as the wall, the beam, and the discharge port is deleted, and only the image of the surface increase allowance 46 of the clinker ash remains on the difference screen 45 as shown in FIG. Although the surface shape of the clinker ash is strictly different between the two screens, the two are extremely uniform, so that they are canceled out except for light spots of a noise level, resulting in a low density area.
[0028]
Since the clinker ash 42 shown on the initial screen 41 is thinly spread on the upper surface of the dry ash conveyor and is not different from the surface of the conveyor, the clinker ash surface increase margin 46 remaining on the difference screen 45 is taken along the side wall. This corresponds to the clinker ash depth.
Since the depth of the clinker ash can be considered not to change so much over the entire length of the pit 12, an appropriate measurement area is designated on the screen, the depth is calculated there, and the clinker deposition amount over the entire length of the conveyor is determined. Can be estimated.
Since the depth of the clinker ash is determined in relation to the side wall of the pit 12, the measurement area is set to the side wall portions 51 and 52 on both sides of the conveyor 21. The total deposition amount is estimated using the depths 53 and 54 calculated here. By utilizing the walls on both sides, it is possible to account for the bias in the deposition state.
[0029]
The measurement areas 51 and 52 can be determined at fixed positions on the screen. However, since the field of view of the camera 31 may change, the deviation is determined by a pattern matching process using a part that does not change, such as the position of a beam. And it is preferable to adjust the line of sight of the camera 31 so as to reproduce the initial position. Further, the position of the measurement area in the image may be adjusted based on the detected deviation.
In addition, the surface shape of the conveyor 21 on which the screen appears becomes smaller as it goes farther in accordance with the perspective method, and the depth per pixel of the clinker ash image also increases. Therefore, in order to ensure appropriate accuracy in depth measurement, It is preferable that the measurement areas 51 and 52 are not located far from the camera 31.
[0030]
The amount of clinker ash deposited on the conveyor is estimated by the clinker amount measuring device, and when the amount of clinker exceeds a predetermined value, the clinker accumulated by driving the dry ash conveyor 21 via the conveyor control device 36 is subjected to the next processing. Take it out to the process. Since the clinker ash accumulates on the conveyor, it is possible to carry out all the accumulated matter only by rotating the belt a half turn. Once all the clinker ash has been carried out, the conveyor is stopped and no operation is carried out until the clinker has accumulated a predetermined amount.
It is preferable that the measured values sequentially obtained are displayed as numerical values on the display device 35, and are displayed in a form of a graph that is easy to intuitively understand by an operator as a trend of the accumulation state.
[0031]
If the amount of the clinker entering the tunnel 15 is too large, the clinker may be clogged or spilled at the carry-out opening 14 or the tunnel 15 to cause a problem. For this reason, it is required to grasp the state of clinker ash accumulation at a position immediately before the carry-out opening 14.
FIG. 5 is a drawing for explaining a processing procedure for managing the state of clinker ash accumulation immediately before the carry-out opening 14 in the clinker amount measuring device of the present embodiment.
[0032]
As shown in FIG. 5A, a portion where the image 56 of the clinker ash is reflected as a measurement region 57 with the image 55 of the carry-out opening 14 at the innermost position of the video screen as a background. cut. Then, as shown in FIG. 5B, the image signal in the measurement area 57 is processed to detect the contour 58 of the clinker surface.
Here, for example, the contour may be obtained from the light and shade gradient by differentiating the brightness of neighboring pixels.
[0033]
A screen having contour information corresponding to the coordinates of the screen, such as a differential image obtained in this way, integrates the contour information value in the measurement area 57 in the X-axis direction, and distributes the integrated value in the Y-axis direction. That is, the Y-axis projection 59 is obtained and displayed. FIG. 5C shows an example of the Y-axis projection displayed in this manner.
In the Y-axis projection, a peak 60 appears at a position where the outline is frequently located. This position is the mode value of the contour line position, and in many cases can be the average value of the contour line, and can represent the clinker amount. Such a mechanical method is preferable because the average height of the clinker can be efficiently obtained using an electronic computer.
[0034]
If the clinker ash in front of the carry-out opening exceeds a predetermined height, the conveyor can be operated to carry out the clinker before the clinker further accumulates, thereby avoiding a blockage accident or the like.
The Y-axis projection value of the differential image is large when the clinker contour is clear, and is small when the visibility is poor due to dust or the like and the contour is not clear. Therefore, when the projection value falls below a predetermined value, the reliability of the measurement is poor, and it is preferable not to use the projection value as a basis for determination.
[0035]
FIG. 6 is a view for explaining a processing procedure when a shadow of the clinker appears on the near side of the screen. A detection area 61 is set below the video screen 40. Under normal conditions, the clinker deposited on the conveyor 21 is shown at the position of the detection area 61. If the clinker accumulates on the end of the conveyor 21 where the camera 31 is installed due to some abnormality, the clinker mountain blocks the field of view of the camera 31 and a shadow 62 is formed below the video screen 40. This shadow can be mechanically detected by performing image processing such as binarization processing on the image. It is dangerous if the clinker's mountain develops and obstructs the camera's field of view and disables automatic driving. If the peak of the clinker's shadow 62 detected in this way becomes higher than a predetermined threshold 63, an alarm is issued and a worker is warned. To take appropriate action.
[0036]
Further, while the boiler is in operation, clinker may adhere to the inner wall of the boiler and develop as a lump, but such a clinker becomes a large lump and falls onto the conveyor 21. Sometimes. Depending on the size of the lumps, it is necessary to discharge the lumps immediately, so that the operator is required to be aware of the lumps without delay and to process them. However, if the operator must constantly monitor, other work cannot be performed. Therefore, it is preferable to attach a mechanism for automatically detecting and alarming.
FIG. 7 illustrates a procedure executed by an alarm device attached to the clinker amount measuring device according to the present embodiment to automatically detect when a large lump falls on the conveyor.
[0037]
An image 70 as shown in FIG. 7A input from the TV camera 31 for taking in a conveyor image at predetermined time intervals is stored in a storage device. When a new image 71 is input, a difference image 73 between the new image 71 as shown in FIG. 7B and the image 70 of FIG. 7A input a predetermined time ago is generated. The difference image 73 represents a portion changed from the previous state as shown in FIG.
Therefore, when a large lump 72 falls on the conveyor in the new image 71, a large figure 74 appears in the difference image 73. A binarized image is generated using an appropriate threshold value for the difference image 73 thus obtained, and when a figure having an area larger than a predetermined value is detected in the binarized image, a warning is issued and attention is paid to the worker. Prompt.
[0038]
It is preferable that an image when a large block is detected is recorded as a still image or a moving image at a fixed interval so that the image can be reproduced as needed. Even when the operator misses the moment when the lump falls, the situation can be accurately recognized by observing the reproduced moving image or the like. It is preferable that such recording be recorded as digital data on a recording medium that can be randomly accessed, such as a hard disk, every time it occurs so that reproduction can be performed easily and efficiently.
[0039]
【The invention's effect】
As described above, the clinker amount measuring device for the dry ash conveyor of the present invention accurately grasps the amount of clinker ash deposited on the bottom of the boiler simply by providing a TV camera at the end, and discharges the clinker ash from the bottom of the boiler at a required timing. In addition to processing, abnormal deposits can be detected and alarmed, enabling automatic operation of the dry ash conveyor and smooth handling of abnormalities by operators, resulting in more efficient coal firing. Boiler operation can be performed. It should be noted that the TV camera can be configured economically using a conventional monitoring camera.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of an embodiment of a clinker amount measuring device according to the present invention.
FIG. 2 is a conceptual diagram showing a coal-fired boiler and clinker processing equipment to which the clinker amount measuring device of the present embodiment is applied.
FIG. 3 is an image showing a video example captured by a camera in the embodiment.
FIG. 4 is a video diagram illustrating a procedure for measuring a clinker amount by image processing in the present embodiment.
FIG. 5 is a video diagram illustrating a procedure for detecting a clinker accumulation state near a discharge opening by image processing in the present embodiment.
FIG. 6 is a video diagram illustrating a procedure for detecting a clinker deposited on the front of the camera by image processing in the present embodiment.
FIG. 7 is a video diagram illustrating a procedure for detecting a fall of a clinker block by image processing in the present embodiment.
[Explanation of symbols]
10 Furnace
11 Furnace shell
12 pits
13 Transition Hopper
14 Unloading opening
15 Tunnel
16 Hopper
17 Surveillance TV camera
18, 19 beams
21 Dry clinker conveyor
22 Conveyor
30 Clinker amount measuring device
31 Conveyor image acquisition TV camera
32 Image processing device
33 arithmetic unit
34 I / O device
35 Display device
36 Conveyor control device
40, 41, 43 Video screen
42,44 Clinker ash on conveyor
45 Difference screen
46 Surface increase of clinker ash
51,52 Clinker amount measurement area
53,54 Clinker thickness
55 Opening opening image
56 clinker ash image
57 measurement area
58 Clinker Contour
59 Y-axis projection
60 peaks (average clinker profile)
61 Detection area
62 Clinker's Shadow
63 threshold
70, 71 images
72 Changing part
73 Difference image
74 clinker lump

Claims (9)

A measuring device used for measuring the state of clinker ash deposition on a dry ash conveyor provided at the bottom of a pit provided below a furnace of a boiler. A camera for acquiring a video for observing the direction, and an image processing device for inputting the output of the camera and performing image processing, and performing image processing on a plurality of images at different shooting times when the state of clinker ash on the conveyor is captured. A clinker amount measuring device for a dry ash conveyor, wherein a clinker bulk is measured by detecting a clinker accumulation state at a specific position, and a clinker accumulation amount on the conveyor is estimated. 2. The clinker amount measuring device according to claim 1, wherein the specific position is a position of a part of a wall on both sides of the dry ash conveyor, which is reflected in the captured image. The method according to claim 1, further comprising: specifying a portion of an unloading opening provided at an end of the pit in the captured image, performing image processing on the image of the clinker, detecting an abnormal accumulation state, and issuing an alarm. 3. The clinker amount measuring device according to 1 or 2. The clinker amount measuring device according to any one of claims 1 to 3, wherein image processing is performed on an image of a shadow of a clinker appearing on a lower side of the captured image to detect an abnormal deposition state and issue an alarm. . The clinker amount measuring device according to any one of claims 1 to 4, wherein the image processing includes a step of generating a difference image of a plurality of images. 6. The clinker amount measuring device according to claim 5, wherein the image processing includes a step of generating a projection in which pixel information in the difference image is integrated in one axis direction. 7. The clinker amount measuring device according to claim 6, wherein in the projection, when an image is unclear due to the influence of dust and is smaller than a predetermined threshold, the determination is suspended to suppress the influence of dust. 8. The clinker amount measuring device according to claim 1, wherein the estimated clinker accumulation amount is displayed as a trend graph. The output image of the camera is input at a predetermined interval, when a new image is obtained, a difference image is generated from a saved image of a predetermined time ago, the difference image is binarized using an appropriate threshold, and The clinker amount according to any one of claims 1 to 8, further comprising a mechanism for estimating that an abnormal change has occurred if a binarized image having an image larger than a predetermined area is detected. Measuring device.

Images