JP2992687B2 - Static oil leakage monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for monitoring abnormalities of static oil leakage, and more particularly, to installing important equipment such as a machine room or a pump room of various plants such as a burner zone of a thermal power plant and an oil plant. Stationary oil that is used to constantly monitor the area in which it is located and to detect changes in the floor condition at the early stage when black oil leaks to the floor in that area to prevent the development of important equipment from becoming abnormal. Related to the abnormality monitoring device.

[0002]

2. Description of the Related Art A stationary oil leak is not an oil leak that continuously sprays into an installation area of important equipment, but an oil leak that exists in a pool on the floor of the area or a drop that drops irregularly or intermittently. As a means of monitoring the presence or absence of the occurrence of such stationary oil leaks, such as oil, which does not have a continuous change, taking the burner zone of a thermal power plant as an example,
While sequentially switching a plurality of video signals captured by the ITV monitoring camera installed in the burner zone, the video signals are reproduced and displayed on a video display device such as a CRT installed in a central control room or the like. In general, means for monitoring the occurrence of abnormalities by visually observing the information or for patrol by an operator has been employed.

[0003]

However, in the case of visual monitoring and patrol monitoring of images, it is not only necessary to employ a system of constant monitoring by workers, but also because of abnormalities due to oversight of images or occurrence of abnormalities immediately after patrol. It is inevitable that there will be mistakes and delays in the discovery of. As a result, there has been a problem that quick and appropriate initial response to the change in the state of stationary oil leakage, that is, the occurrence of an abnormality, cannot be performed, leading to the development of an abnormal situation in neighboring equipment.

In order to solve the problems of the visual monitoring and the patrol monitoring as described above, a video signal picked up by a monitoring camera is processed to automatically detect whether an abnormality has occurred and to issue an alarm. The following monitoring device has also been proposed. However, conventionally proposed monitoring devices based on image processing require the passage of persons such as facility managers and maintenance workers, work in the area, the influence of shadows of persons, and tools that have been brought into the area and left behind. Is incorrect and inadequate to distinguish between black objects and static oil leaks
This was a cause of frequent false alarms.

[0005] The present invention has been made in view of the above-mentioned circumstances, and it is possible to detect the occurrence of an abnormality at an early stage and appropriately take an initial countermeasure without employing a constant monitoring system by an operator. It is possible to accurately detect only the presence or absence of stationary oil leakage by monitoring and excluding people passing through, working in the area, the influence of shadows of people, and black objects brought into the area and left unattended. It is an object of the present invention to provide a highly reliable static oil leakage monitoring device.

[0006]

To achieve the above object, a stationary oil leakage abnormality monitoring apparatus according to the first aspect of the present invention captures images of a plurality of locations in a set monitoring area. A plurality of cameras, a video switching unit for sequentially switching and controlling the output of a plurality of video signals picked up by these cameras, and a video signal switched and output by the video switching unit, which changes between two consecutive images to hold means for determining whether there is, when it is determined that there is a change, the status of the monitoring exclusion after <br/> the human body detecting sensor which is provided is determined to operate the monitoring area It determined moving means for setting the time, or Taka whether the human body detection sensor operates in
When the state of the normal monitoring is confirmed by the determination of the no work is captured by one camera video signal input
While monitoring changes state between two consecutive images, the human body detection
Input of the video signal to be captured by the next camera when the knowledge sensor state monitoring excluded by determining the operated confirmed
Means to switch to force and normal monitoring from the state of exclusion of monitoring from the previous monitoring to the current monitoring by the video signal of each camera
Means for determining whether there has been a return operation to the state of
When it is determined that there has been a return operation, means for setting the monitoring area again, image processing means having means for determining the presence or absence of abnormality of stationary oil leakage in the set monitoring area, and An alarm display device for displaying an abnormal alarm that is transmitted when the result of the determination is abnormal.

According to the first aspect of the present invention, the video signals are input to the video processing means while the video signals at a plurality of locations in the monitoring area imaged by the plurality of cameras are sequentially switched. whether between two consecutive images is changed is detected, when it is determined that there is a change between two consecutive images, monitors exclusion of state after <br/> the human body detection sensor is determined to be operating Is set, and the state of normal monitoring and the state of monitoring exclusion are confirmed by the operation determination of the human body detection sensor. Two continuous images are obtained only when the state of normal monitoring is confirmed. During this time, the input signal is switched to the input of a video signal captured by the next camera. Thus, if a worker or the like or through a monitoring area, and or work in the area it is possible to exclude the monitoring of predetermined still leakage oil.

Further, it is determined whether there is return operation to the state of normal monitoring from the monitoring lockout condition until monitoring of the current from the previous monitoring by video signals of the cameras, if there is a return operation After setting the monitoring area again, by determining the presence or absence of stationary oil leakage in the monitoring area,
Even if a black object such as a tool is brought into the monitoring area and left in the monitoring exclusion state, the object can be excluded from predetermined stationary oil leakage monitoring.

As described above, by excluding the passage of a person through the monitoring area, the work in the area, the influence of the shadow of the person, and the monitoring of a black-colored object brought into the area and abandoned, the predetermined stationary leakage can be prevented. It is possible to accurately detect only the presence / absence of oil abnormality, prevent false alarms, and enhance the reliability of stationary oil abnormality monitoring.

[0010] Further, when it is determined in the processing result by the image processing means that there is still oil leakage in the monitoring area, as in claim 2, the state has continued for a predetermined time or more. By providing a means for transmitting an alarm, it is possible to prevent the influence of the shadow of a person and to eliminate unnecessary alarm transmission when stationary oil leakage is within a range that does not hinder disaster prevention and security. .

Further, in the stationary oil leakage abnormality monitoring device, when the monitoring area is reset, when the effective monitoring area is smaller than a specified value, a warning signal indicating that monitoring is not possible is output. With such a configuration, it is determined whether the set monitoring area itself is normal (monitoring possible) with respect to the subsequent monitoring of the stationary oil leakage, and the monitoring area can always be normally monitored. It is easy to maintain the state.

Still further, the dirt in the monitoring area is not always kept constant, and attention is paid to the fact that the dirt is likely to change with time due to, for example, a burner replacement operation. By adding a means for monitoring and removing the dirt over time, it is possible to realize an accurate monitoring of stationary oil leakage abnormality in accordance with the current situation.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an image view of a monitoring area in a burner zone of a thermal power plant to which the abnormality monitoring apparatus for stationary oil leakage according to the present invention is applied, and an inspection passage 22 is provided in front of a boiler wall 21 provided with a plurality of fuel burners 20. An oil pan whose floor surface is painted with a white paint or whose inside is painted white is provided below the fuel burner 20 at a location along the inspection passage 22. , A stationary oil leakage monitoring area 23 is set. A photoelectric type human body detection sensor 24 is installed in the inspection passage 22 on both sides of the stationary oil leakage monitoring area 23, and an area slightly larger than the distance between the two human body detection sensors 24 is monitored by a camera described later. The range L is set.

FIG. 2 is a schematic configuration diagram of the abnormality monitoring system in the burner zone of the above-described thermal power plant. In FIG. 2, reference numeral 1 denotes a plurality of video monitoring ranges L including the stationary oil leakage monitoring area 23 in the burner zone. A plurality of cameras installed so as to capture images, 2 is an image switcher, 3 is a CRT as an alarm display device installed in the central control room 4 at a position away from the burner zone, 5 is image processing software , A capture board 5b that captures the video processing result screen, compresses and captures a still image at the time of abnormality, and a monitoring CPU that has a CRT 5c for monitoring video signals.
The PU 5 reads the operation state of the human body detection sensor 24 through the sequencer 6, transmits a switching signal to the video switcher 2 through the sequencer 6,
It has a function and outputs a switching image signals to the video switcher 8 to CRT3 central control chamber 4 from the camera 1 via the. Reference numeral 7 denotes a time base collector for correcting a synchronizing signal so that the video signal sequentially switched and output from the video switcher 2 can be processed by the image processing board 5a.

The video processing board 5a of the monitoring CPU 5
Means for binarizing two continuous images (still images) of a video signal output from the video switcher 2 and input in synchronization with each other, and determines whether or not there is a change between the two images; when the determination result is Yes change in the means for timer set time for maintaining the state of monitoring exclusion after the human body detection sensor 24 is determined to be <br/> operation, the human body detecting sensor 2
Judgment of the operation state of 4, that is, judgment of whether or not it has operated
And, whether the normal monitoring of the state Ru good to a determination that not running motion
Only Taking the next camera 1 when in the state of monitoring exclusion check whether the state of the monitoring exclusion determination that was created
Means for switching to input of a video signal to be imaged , confirmation means of the human body detection sensor, which determines whether or not there has been a return operation from the state of exclusion of monitoring to the state of normal monitoring from the previous monitoring to the current monitoring. Means for resetting the stationary oil leakage monitoring area 23 when a return operation is performed, and means for determining whether or not there is stationary oil leakage and whether or not the state of the stationary oil leakage has continued for a predetermined time or more. And so on.

Next, the processing operation of the stationary oil leakage monitoring device in the monitoring area in the burner zone of the thermal power plant configured as described above will be described with reference to the flowchart of FIG. A plurality of video signals imaged by the plurality of cameras 1 are sequentially switched and output in a primary abnormality monitoring cycle T1 (standard 2 seconds) by a switching operation of a video switcher 2 based on a switching signal from a sequencer 6 to output one image signal. The video signal is corrected for the synchronizing signal by the time base collector 7, is taken into the video processing board 5a of the monitoring CPU 5, and is stored as an initial image (step S3).
1, S32).

Next, the image processing board 5 determines whether or not an image from the target camera 1 is reflected in the stored initial image.
If a is determined, and if it is not reflected, the device warning signal (ANN)
Is output, and if the image is normally displayed, the next one image signal is captured and stored as the current image (step S3).
3, S34). The difference (change) is calculated by the absolute value calculation between the two consecutive images of the initial image and the current image thus captured.
Is detected, and a mask process is performed to overlap the changed image (difference image) with a mask image (a monitoring exclusion area set for each camera 1) registered in advance (steps S35 and S36).

Then, the masked image is set to a threshold (0
~ 255), and the number of pixels after noise processing is counted.
And compare the count value with the specified value to determine if there is a change.
It is determined, and if there is a change, within the primary abnormality monitoring cycle T1
The number of changes that have occurred is sequentially incremented, and the
Sa24ButmotionWas determined to haveLater monitoring exclusionofKeep state
Time to haveTotalPreset (re-set) the timer
(Steps S37 to S3)
9). In addition,Occurred within the primary abnormality monitoring cycle T1Number of changes
IsnextCamera 1Video signal input bySwitch toIs
Later, it is always cleared.

Subsequently, it is determined whether or not the above-mentioned primary abnormality monitoring period T1 has been exceeded.
It is determined whether or not a predetermined image update cycle (a definition of how many scans the update process is performed) has been reached. If it is determined that the update cycle has been reached, the process proceeds to step S34. The current image is replaced as the initial image in step S32 (steps S40 to S42).

On the other hand, if it is determined in step S40 that the primary abnormality monitoring period T1 has been exceeded, a monitoring flag is read to determine whether the human body detection sensor 24 has operated. Here, the monitoring flag is
Normal monitoring state where the detection sensor 24 is not operating
When state, and are not to determine the human body detection sensor 24 is the monitoring care and <br/> monitoring exclusion operation state, three, readings <br/> filled-in monitoring flag monitoring attention and monitoring of the Excluded
If it is determined that the state, shooting Ri by the next of the camera 1
Returning to step S31 is switched to the input of the image is Ru video signal, also only proceeds to the next step when it is determined that the state of the normal monitoring (step S43, S4
4). By performing such a process of confirming the operation state of the human body detection sensor 24, it is possible to determine whether a worker or the like passes through the stationary oil leakage monitoring area 23 or works in the area 23 by a predetermined stationary oil leakage. Can be excluded from monitoring.

When the operation confirmation of the human body detection sensor 24 is completed, the number of changes occurring during the primary abnormality monitoring is counted, and it is determined whether or not the total of the counted number (the number of changes) exceeds a specified value. Then, as a result, when it is determined that it has not exceeded, it is determined whether or not the stationary oil leakage monitoring area 23 has been set, that is, whether or not it is the first activation (steps S45 and S46). This process is executed at the first startup because the stationary oil leak monitoring area 23 has not been set for all the cameras 1.

[0022] If the still leakage oil monitoring area 23 is configured, to the state of normal monitoring of the state of the monitoring attention and monitoring exclusions described above until the monitoring time from the previous monitoring by camera 1 of the video signal It is determined whether or not the return operation has been performed. If it is determined that the return operation has been performed, it is determined whether or not the number of changes used in the determination in step S45 is 0 (the image is stable). , 0, the stationary oil leak monitoring area 23 is reset, and if it is not 0, the setting is disabled and the monitoring is switched to monitoring by the video signal of the next camera 1 and the process returns to step S31 (steps S47 to S49).
Thus it is determined whether there is excluded returning operation between the previous monitoring by movies image signal of the corresponding camera 1 to the current monitored by if there is a return operation for setting process monitoring area again Even if a black object M such as a tool (see FIG. 1) such as a tool is brought into the stationary oil leakage monitoring area 23 and left unattended in a state of monitoring attention or monitoring exclusion , the presence of the object M is determined by a predetermined value. It can be excluded from monitoring stationary oil leaks.

If the static oil leakage monitoring area 23 is reset based on the fact that the number of changes is 0 (the image is stable) in the determination in step S48,
It is determined whether or not the reset stationary oil leakage monitoring area 23 is in a normal monitoring state (step S50). This is because the effective monitoring area (the area of the white portion) calculated by performing a white or black determination on the static oil leakage monitoring area 23 of the white floor that is separated in advance is smaller than a specified value. If the effective monitoring area (the area of the white portion) is determined to be smaller than the specified value, a warning signal (ANN) indicating that static oil leakage cannot be monitored is output. The monitoring area 23 is always maintained in a state where normal monitoring can be performed.

If it is determined in step S45 that the total number of changes occurring during the monitoring of the primary abnormality exceeds the specified value, the process proceeds to step S45.
A determination is made as to whether the stationary oil leakage monitoring area 23 has been set, as in step 46, and whether an exclusion return operation has been performed, as in step S47. switching Ri to the input of the captured Ru video signal good step S3
Return to 1. As a result, the stationary oil leakage monitoring area 23
For example, even if it becomes dirty with black B (see FIG. 1) over time due to a burner replacement operation or the like, such a stain is removed from monitoring over time, and subsequent monitoring of static oil leakage is performed appropriately in accordance with the current situation. be able to.

If it is determined in step S47 that there is no exclusion return operation, that is, if it is determined that resetting of the stationary oil leakage monitoring area 23 is not necessary, the stationary oil leakage monitoring area is determined. The reduction rate of the current area (the area of the white portion in the current stationary oil leak monitoring area) with respect to the effective monitoring area in 23 is calculated, and whether or not it is normal or abnormal depends on whether or not it exceeds a specified value. Is determined,
If it is normal, the monitoring is switched to the next monitoring by the video signal of the camera 1 , and the process returns to step S31. Output, CRT3 of central control room 4
On that originated the signal to switch the screen, film of the next camera 1
The monitoring is switched to the monitoring using the image signal, and the process returns to step S31 (steps S53 and S54).

As described in step S54, when the state where there is a stationary oil leak in the monitoring area 23 has continued for a predetermined time or more, a process of outputting an alarm signal (ANN) is performed, whereby The effect of shadows can be prevented, and unnecessary warnings can be eliminated when stationary oil leakage is within a range that does not impede disaster prevention and security.

In the above embodiment, the monitoring target has been described as applied to the burner zone of a thermal power plant. In addition, important equipment such as a machine room such as an oil plant and a pump room are installed. The same effect as described above can be exerted even when the present invention is applied to monitoring of stationary oil leakage in an area where the oil leaks.

[0028]

As described above, according to the first aspect of the present invention, it is possible to frequently monitor the presence / absence of abnormal oil leakage by effectively utilizing the video signal captured by the monitoring camera. Yes, it is possible to detect the presence of abnormalities at an early stage and prevent the development of abnormal situations by appropriate initial response without employing a regular monitoring system by workers. Or while working in the area, can be excluded from the predetermined stationary oil leak monitoring, and black objects such as tools were brought into the area and left unattended in such a monitoring excluded state In such a case, the object can also be excluded from predetermined static oil leak monitoring. Therefore, the reliability of monitoring can be significantly improved by accurately detecting only the presence / absence of a predetermined stationary oil leak while avoiding erroneous determinations and false alarms due to disturbances other than stationary oil leakage. To play.

According to the second aspect of the present invention, in addition to the effects of the first aspect of the present invention, the influence of the shadow of a person can be prevented, and the stationary oil leakage does not hinder disaster prevention and security. This has the effect of eliminating unnecessary alarm transmission when the distance is within the range.

Further, according to the invention described in claim 3,
In addition to the effects of the invention described in claim 1 or 2, the set monitoring area itself can be easily maintained in a state where normal monitoring can always be performed. Claim 4
According to the invention described in the above, even if the monitoring area becomes dirty over time due to, for example, a burner replacement operation, the monitoring automatically excludes the dirt and performs an accurate monitoring of the stationary oil leakage abnormality in accordance with the current situation. This has the effect that it can be realized.

[Brief description of the drawings]

FIG. 1 is an image diagram of a monitoring area in a burner zone of a thermal power plant to which a stationary oil leakage monitoring device according to the present invention is applied.

FIG. 2 is a schematic configuration diagram of an abnormality monitoring system in a burner zone of the thermal power plant.

FIG. 3 is a flowchart showing a processing operation of the stationary oil leakage abnormality monitoring device in a monitoring area in a burner zone of the thermal power plant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera 2 Video switching part 3 CRT (alarm display means) 5 Monitoring CPU 5a Image processing board (video processing means) 23 Static oil leakage monitoring area 24 Human body detection sensor

Continuing on the front page (72) Inventor Seizaburo Murayama 3-14-40 Senrioka, Settsu-shi, Osaka Inside Toko Seiki Co., Ltd. (72) Inventor Tetsunori Imamura 3-14-40 Senrioka, Settsu-shi, Osaka Toko Seiki (56) References JP-A-8-287232 (JP, A) JP-A-8-201212 (JP, A) JP-A-9-196805 (JP, A) (58) Fields surveyed (Int. Cl. ^6, DB name) G01M 3/38 G08B 25/00 510 G08B 29/00

Claims (5)

(57) [Claims] And a plurality of cameras for imaging a plurality of locations of 1. A monitoring area set, a video switching unit for successively switching control outputs of the plurality of video signals captured by these cameras, switching in the video switching unit determination means for determining whether there is a change between two consecutive images with a picture signal to be output, when it is determined that there is a change, the human body detection sensor provided in the monitoring area is actuated and means for setting the time for maintaining the state of monitoring exclusion after being, Do not operate to determine whether the human body detection sensor is activated
One is when the state of the normal monitoring has been confirmed by the intention of the judgment
Monitors the change between two consecutive images of the video signal captured and input by the camera, while the human body detection sensor
Means for switching to the input of a video signal captured by the next camera when the status of monitoring exclusion is confirmed by the determination that the camera has been operated; and means for switching from the previous monitoring to the current monitoring by the video signal of each camera. when it is judged means for determining whether there has been a return operation to the state of normal monitoring from the monitoring lockout condition, that there has been a return operation between, means for setting a monitoring area again, set the surveillance area Image processing means having means for determining the presence or absence of an abnormality in stationary oil leakage, and an alarm display device for displaying an abnormality alarm transmitted when the result of the determination by the image processing means is abnormal. Abnormality monitoring device for static oil leakage. 2. The stationary apparatus according to claim 1, further comprising means for issuing an alarm when it is determined that there is a stationary oil leak in the monitoring area and the state has continued for a predetermined time or more. Oil leakage abnormality monitoring device. 3. The stationary oil leak according to claim 1, wherein, when resetting the monitoring area, if the effective monitoring area is smaller than a specified value, a warning signal indicating that monitoring is not possible is output. Abnormality monitoring device. 4. The static oil leakage abnormality monitoring device according to claim 1, further comprising means for monitoring and eliminating contamination with time in the monitoring area. 5. The presence or absence of a stationary oil leak to the monitoring area
The static oil leakage monitoring device according to claim 1, wherein the determination is made based on a ratio of the current effective area to the effective monitoring area calculated at the time of setting the area.