JPH0121403B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting the burnout point of a waste incinerator.

In the operation of a garbage incinerator, it is important to burn garbage efficiently and without leaving any unburned substances. In order to leave no unburned material, it is necessary to burn out all the combustible materials in the furnace. Therefore, the burnout point has traditionally been monitored, but conventional burnout point detection involves human visual observation (direct monitoring inside the furnace or monitoring using a television monitor); The disadvantage is that the difference is large and quantitativeness is significantly lacking.

The present invention automatically displays a mark indicating the burnout point along with the original image showing the combustion status on the monitor screen, and enables burnout inspection of a garbage incinerator that enables objective and highly accurate monitoring of the burnout point. The purpose is to provide a method for exiting.

In order to achieve the above object, the present invention installs a brightness measuring device near the exit of a waste incinerator having a stoker or a rotary kiln at the exit, and measures the brightness distribution inside the incinerator. For each point, the brightness on a line in the width direction perpendicular to the direction of movement of the garbage is detected, and the brightness on the line in the width direction perpendicular to the direction of movement of the garbage is detected at each measurement point in the direction of movement of the garbage. The length in the width direction where the luminance exceeds a certain level is compared with a predetermined value, and as a result of the comparison, the length in the width direction changes from a state of more than a predetermined value to a state of less than a predetermined value, or a state of a state of less than a predetermined value to a state of a state of more than a predetermined value. The point where the temperature changes is detected as the burnout point.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows the configuration of main parts of a garbage incinerator to which the present invention is applied, in which 1 is an incinerator;
1 is a kiln installed at the exit of the incinerator 1, and 3 is an ITV (industrial television) camera installed near the exit of the kiln 2 to photograph the inside of the kiln 2 and the vicinity of the exit of the incinerator 1. In addition, 11 is a grate provided in the incinerator 1, 12 is garbage (or ash), 13 is a flame generated by burning the garbage 12, 21 is garbage that was not burnt out in the incinerator 1, 22 is the flame generated by the combustion of this garbage.

FIG. 2 is a front view of the vicinity of the joint between the incinerator 1 and the kiln 2, showing the combustion situation, and the same parts as in FIG. 1 are given the same reference numerals. The distribution of brightness on the width direction lines (A-A', B-B', C-C') perpendicular to the direction of dust movement (from the back to the front of the paper) in Figure 2 is It will look like Figure 3. That is, there are many bright areas upstream of the burnout point, and fewer bright areas downstream of the burnout point. In other words, the brightness at line A-A' in FIG. 2 is equal to the brightness at line A-A' in FIG.
The brightness at line C-C' in Figure 2 is lower than slice level SL, as shown by line C-C' in Figure 3. Become. Also, at the burnout point B-B' in Figure 2, as shown by the line B-B' in Figure 3, some parts are higher than the slice level SL, and other parts are lower than the slice level SL. . Therefore, in FIG. 3, the burnout point can be detected by comparing the length in the width direction where the brightness exceeds the slice level SL with a predetermined value.

Specifically, it was installed near the exit of kiln 2.
This is done by displaying the image signal from the ITV camera 3 on a monitor screen 32 through an image analyzer 31 as shown in FIG. That is, the ITV camera 3 detects the brightness inside the kiln 2 and near the exit of the incinerator 1, converts it into an electrical signal, and inputs it to the image analyzer 31. This image analyzer 31 applies the method described above to detect the burnout point in the kiln 2 and the burnout point in the incinerator 1.

That is, as shown in FIG. 6, the brightness on a line perpendicular to the width direction with respect to the moving direction of the dust 12 is measured using the ITV camera 3, which is a brightness measuring device, for example, in the forward direction ( Each line is sequentially detected from the top to the bottom in the figure (in other words, in the same direction as the direction of movement of the dust), and the length in the width direction where the level of the detected luminance signal exceeds the slice level is calculated, and then this width The length in the direction is compared with a predetermined value, and as a result, the point where the state changes to the predetermined value or more or the predetermined value or less is detected as the burnout point, and this burnout point is displayed on the monitor screen 32. For example, it is displayed as a white line on the original image. In the case of Fig. 6, since the width direction length exceeding the slice level changes from a state above a predetermined value to a state below a predetermined value at point B, this point B can be detected as the burnout point. .

In this case, the brightness on the line perpendicular to the width direction with respect to the direction of movement of the dust 12 is set not in the forward direction but in the opposite direction (from the bottom to the top in the figure, that is, opposite to the direction of movement of the dust). line by line), and detect the point where the length in the width direction where the level of the detected luminance signal exceeds the slice bell changes from below a predetermined value to above a predetermined value. It may also be detected as a cut point. In this case as well, since the width direction length exceeding the slice level changes from a state below a predetermined value to a state above a predetermined value at point B, this B
A point can be detected as a burnout point.

Further, in the above, the detection and comparison of the width direction length is specifically performed, for example, as follows. That is, the field of view of the ITV camera 3 is divided into m×n grid points as shown in FIG. Then, each grid point is
The luminance data Br(xi, yi) of xi, yi are sequentially selected, taken in, and processed in the forward or reverse direction by the method described above.

In other words, when the slice level of brightness is SL and the function Hij=1:Br(xi,yi)≧SL 0:Br(xi,yi)<SL is defined, Lj is obtained when J is increased from 1 to m. =Hij is calculated sequentially, and when Lj goes from exceeding a predetermined number d to less than d, that point is determined to be the burnout point.

Conversely, if you decrease J from m to 1,
When Lj changes from a state below d to a state exceeding d, that point may be determined to be the burnout point.

For example, in FIGS. 2 and 3, Lj=n>d on line A-A', and Lj=0<d on line C-C'. Furthermore, on the line B-B', Lj=a+b, and the point where the value of a+b crosses d is the burnout point.

FIG. 5 shows the original image displayed on the monitor screen 32 and the burnout point displayed on it, where 51 is the connection line between kiln 2 and incinerator 1, and 52
is the inner wall of kiln 2, 53 is the inside of incinerator 1, 13
is the flame in the incinerator 1, 22 is the flame in the kiln 2, M ₁ is the burnout point in the incinerator 1, and M ₂
is a mark indicating the burnout point in kiln 2.
Although not shown in FIG. 5, the image actually displayed on the monitor screen 32 shows that the flame area is white (bright), the area relatively close to the flame area is dimly bright, and the further away from the flame area, the brighter the image is. It has become black (dark).

Incidentally, the burnout point as used in the present invention is the point where the garbage has been burned, and there may be several points. However, any number of locations can be detected by the method of the present invention. In other words, among the many burnout points that exist, the one that is important for controlling a waste incinerator is the burnout point closest to the exit of the stoker or rotary kiln (final burnout point), and this point is set within a certain range. Efficient operation of the waste incinerator is possible by maintaining the Further, even if a large number of burnout points are displayed on the monitor screen, it is extremely easy for a human being to judge which point is the final burnout point by looking at the display. That is, among the burnout points displayed in the portions corresponding to the stoker and rotary kiln in FIG. 6, the one closest to the outlet (lower side in the figure) may be recognized as the final burnout point. Also,
It is self-evident that the technique of selecting the final burnout point from among these plurality of burnout points and displaying only that point is self-evident, so if the above-mentioned display is troublesome, such a method may be used.

As explained above, according to the present invention, a brightness measuring device for measuring the brightness distribution inside the incinerator is installed near the exit of a waste incinerator having a stoker or a rotary kiln at the exit, and a brightness measuring device is installed near the exit of a waste incinerator having a stoker or a rotary kiln at the exit. , the brightness on the line in the width direction perpendicular to the direction of movement of the garbage is detected, and the brightness on the line in the width direction perpendicular to the direction of movement of the garbage is detected at different measurement points in the direction of movement of the garbage. The length in the width direction exceeds a certain level is compared with a predetermined value, and as a result of the comparison, the length in the width direction changes from a state of more than a predetermined value to a state of less than a predetermined value, or from a state of less than a predetermined value to a state of more than a predetermined value. The changing point is detected as the burnout point, and if necessary, this burnout point is displayed as a white line on the original image on the monitor screen, which previously relied on human visual inspection. The burnout point can be detected automatically and with high precision, and this information can be used to warn of unsuitable burnout points, control kiln rotation speed, and control grate operation to maintain appropriate burnout weight loss. It is possible to provide a method for detecting the burnout point of a garbage incinerator, which achieves excellent effects such as making it possible to

[Brief explanation of drawings]

Figures 1 to 7 are diagrams for explaining one embodiment of the present invention. Figure 1 is a configuration diagram schematically showing the inside of an incinerator and a kiln of a waste incinerator, and Figure 2 is a diagram for explaining an embodiment of the present invention. Figure 3 is a front view showing the combustion situation near the incinerator outlet; Figure 3 is a diagram showing the brightness distribution at a predetermined position in the incinerator shown in Figures 1 and 2; Figure 4 is a configuration diagram of the electrical signal processing system. , FIG. 5 is a diagram schematically showing an image displayed on a monitor screen, and FIGS. 6 and 7 are diagrams for specifically explaining the burnout point detection method. 1... Incinerator, 2... Kiln, 3... ITV camera, 11... Grate, 13, 21... Garbage, 1
4, 22...Flame, 31...Image analyzer, 32...
...Monitor screen, M ₁ , M ₂ ... Burnout point mark.

Claims (1)

[Claims] 1. A luminance measuring device for measuring the luminance distribution inside the incinerator is installed near the exit of a garbage incinerator having a stoker or a rotary kiln at the outlet, and The brightness on the line in the width direction perpendicular to the direction of movement is detected, and the brightness on the line in the width direction perpendicular to the direction of movement of the waste reaches a certain level at different measurement points in the direction of movement of the waste. The exceeded length in the width direction is compared with a predetermined value, and as a result of the comparison, the length in the width direction changes from being above the predetermined value to being less than the predetermined value, or from being less than the predetermined value to being greater than the predetermined value. Points are now detected as burnout points. A method for detecting the burnout point of a garbage incinerator, characterized by the following.