JPH06101826A - Detection of thickness of waste refuse - Google Patents

Abstract

PURPOSE:To provide an automatically detecting method for the thickness of waste refuse in which no erroneous operation is caused due to a clinker. CONSTITUTION:An inside part of an incinerator is photographed by the use of a color television camera 2. A color image signal got by the color television camera 2 is separated into three primary color signals of red, green and blue with a three primary color separating circuit. Each of the color signals is made to have multi-values in response to an intensity of each of the colors. The image signals are classified as one of specified numbers of colors in respect to a rate of intensity of each of the three primary colors. It is decided to what color of each of the regions of a specified combustion region 9, a specified noncombustion region 10 and an incinerator wall region 11 does this image signal correspond. A combustion completing level 16 where a color change occurs from the combustion region 9 to the noncombustion region 10 is detected. A first crossing point 13 between this level 16 and the incinerator wall region 11 is detected, a second crossing point 14 where an interface line 14 between a preset fire grate and the incinerator wall is crossed with a vertical line of the first crossing point 13 is detected, a distance ranging from the first crossing point 13 to the second crossing point 14 is calculated and then a thickness 15 at the combustion completing point of waste refuse in contact with the incinerator wall is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically detecting a dust thickness at a burnout point on a grate in an incinerator.

[0002]

2. Description of the Related Art In the operation of a refuse incinerator, controlling the thickness of the refuse is an important operating factor. If the dust thickness on the grate is in the proper range, combustion will proceed smoothly, but if the dust thickness becomes thicker than the proper range, combustion will not proceed smoothly. The cause of thick dust is that the amount of dust is too large, the amount of combustion air is small, and the interval of the grate is not adjusted properly. It is necessary to properly adjust this. Therefore, it is essential to measure the dust thickness in order to make an appropriate adjustment.For this measurement, a dust thickness meter using microwaves was conventionally installed on the furnace wall, and dust was measured by the amount of microwave transmission. I was measuring the thickness.

[0003]

However, the dust thickness gauge utilizing microwaves malfunctions due to a clinker generated on the furnace wall portion where the dust thickness gauge is installed, resulting in an unreasonably large dust thickness. There was a drawback.

[0004]

A method for detecting the thickness of dust according to the present invention is designed such that the inside of an incinerator is imaged by a color television camera, and a color image signal obtained from the color television camera is red, green, and Separated into three primary colors of blue, multi-valued for each color intensity, the image signal is classified into any of a plurality of colors preset for the ratio of the intensity of the three primary colors, It is determined which of the colors of the set combustion area, non-combustion area, and furnace wall area corresponds, and the burn-out level at which the color change from the combustion area to the non-combustion area occurs is detected. Detecting a first intersection with the wall region, detecting a second intersection at which a boundary line between the preset grate and the furnace wall and a perpendicular from the first intersection intersect, and detecting the first intersection from the second intersection. Calculate the distance, and set it at the combustion end point of the waste that contacts the furnace wall. It is characterized in detecting the thickness that.

[0005]

According to the present invention, the color television camera images the combustion portion in the furnace, and all or part of the color image signal is separated into red, green and blue signals, and the intensity of each color is adjusted. Multi-valued, the image signal is classified into any of a plurality of preset colors for the ratio of the intensity of the three primary colors, preset combustion region, non-combustion region, each of the furnace wall region By determining which of the colors corresponds, the combustion area, the non-combustion area, and the furnace wall area can be classified with almost the same accuracy as with visual inspection and quickly. The burn-out level at which a color change from the area to the non-combustion area is detected, the first intersection between this level and the furnace wall area is detected, and the preset boundary line between the grate and the furnace wall and the first intersection point are detected. The second intersection point where the perpendicular line from Seeking distance al to the second intersection point, and detects the dust thickness at combustion end portion on the furnace wall portion, it can be accurately and easily detect the dust thickness.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to an embodiment shown in the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a refuse incinerator, and an industrial color television camera 2 is installed near the exit of the refuse incinerator 1, and the inside of the refuse incinerator 1, particularly the fire, is installed. An image is taken near the burn-out point of dust on the grid 8 (change point from the combustion region 9 to the non-combustion region 10). The image signal from the industrial color television camera 2 is an analog signal, and it is possible to reproduce a color image almost the same as in the furnace on the surveillance television. This image signal is red in the three primary color separation circuit 3,
The signals are separated into three primary color signals of green and blue, and are converted by the computer 4 into multilevel signals corresponding to the respective color intensities of the three primary colors. In this conversion, for example, a signal of 256 stages is converted into a multilevel signal of a desired stage. The multi-valued signal is converted into, for example, a signal of three levels of 0, 1, and 2, and the image signal is classified into any of a plurality of colors set in advance for the ratio of the strengths of the three primary colors. It is also possible to take out a part of the image signal at an appropriate interval (for example, every 8 dots) without using the entire image signal. The change in color due to the combination of the three primary colors is as shown in FIG. 7. However, it is desirable that the plurality of colors adopted here consider not only the difference in hue but also the difference in lightness. Is desirable.

The 16 colors are, for example, bright white, slightly dark white, gray, black, bright red, slightly dark red, bright green, slightly dark green, bright blue, slightly dark blue, bright yellow, slightly dark yellow, bright light blue, There are 16 colors: slightly dark blue, light purple, and slightly dark purple.

The three primary colors are represented by three levels of 0, 1 and 2, respectively, and if all the combinations are taken, the following 27
However, among these, clear color, gray, dark yellow,
As for dark blue and dark purple, if a plurality of combinations are included and they are expressed as one color, the above 16 colors are obtained. This color is determined in consideration of the color of the burning dust and the color perceived by the human eye. Note that it is desirable to use a color that can be displayed on a computer for determining this color.

Red Green Blue Red Green Blue Red Green Blue * 2 1 2 Clear color * 2 0 0 Bright red 0 1 1 Dark water color * 2 2 1 Clear color 1 0 0 Dark red 0 1 2 Dark water color * 2 2 2 Clear Color * 0 2 0 Light green 0 2 1 Dark light blue * 1 2 2 Dark white 0 1 0 Dark green * 0 2 2 Light light blue * 1 1 1 Gray * 0 0 2 Light blue * 2 0 2 Light purple * 1 1 2 Gray 0 0 1 Dark blue 1 0 1 Dark purple * 1 2 1 Gray * 2 2 0 Light yellow 1 0 2 Dark purple * 2 1 1 Gray 2 1 0 Dark yellow 2 0 1 Dark purple 0 0 0 Black 1 1 0 Dark yellow 1 2 0 dark yellow

In this way, the combination of the ratios of the three primary colors is stored in advance in the storage unit of the computer in association with a plurality of colors, and this is compared with the image signal.
The image signals can be classified into, for example, the above 16 colors, and as shown in FIG. 5, a color image of 16 colors close to the image signals can be displayed on the screen of the computer monitor 5.

[0012] The point at which the waste burning region 9 changes to the non-burning region 10 is the burn-out point.
The color is set by dividing the color into the color of the burning area and the color of the non-burning area in advance, and determining which color the image signal corresponds to. Of the 16 colors, the color of the combustion area 9 is white, dark white, gray, light red, light green, light blue, light yellow, light blue, light purple (marked with * in the table above).
And the other colors are the colors of the non-burning region 10. That is, regarding the color of the combustion region 7, one of the three primary colors is a bright color (2) and the sum of the three primary colors is 4 or more in principle. In this way, the burn-out level 16 can be known by detecting the final position at which the color of the combustion region 9 changes to the color of the non-combustion region 10. In addition,
It is also possible to sequentially scan from the bottom of the screen and set the position at which the non-combustion region 10 first changes to the combustion region 9 as the burn-out level. When the first or last changed position is 1 point, the burnout level is not set, and when the changed position is 2 or more specific points, the burnout level is set.

In FIG. 3 to FIG. 5, 11 is a furnace wall region, and this color is measured in advance by measuring the color of the furnace wall region.
By inputting this color into the storage unit of the computer 4, the color of the furnace wall region in the image signal can be identified. In this way, the first intersection 13 between the burnout level 16 and the furnace wall region 11 is detected by the computer monitor 5.
It can be determined by identifying the color change on the screen of the computer using a computer or the like. 3 to 5
12 is a boundary line between the grate 8 and the furnace wall region 11, and cannot be seen because there is dust when burning the dust, but as shown in FIG. 6, images are taken in advance in the absence of dust, By inputting this in the storage unit of the computer 4, this position can be known. The first intersection 1
The second intersection 14 between the perpendicular from 3 and the boundary 12 between the grate 8 and the furnace wall 11 is examined, and the first intersection 13 and the second intersection 14 are examined.
The dust thickness at the burn-out level can be determined by detecting the distance between and.

[0014]

As is apparent from the above description, the present invention detects the burn-out point in the furnace wall by detecting the color of the burning area, the color of the unburned area, and the color of the furnace wall in the furnace. Since the dust thickness is detected and the dust thickness at that point is detected, an accurate dust thickness that is not affected by the clinker can be detected.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a dust thickness measurement portion.

FIG. 3 is a perspective view showing a burning region, a non-burning region, and a furnace wall region of dust on the grate.

FIG. 4 is a perspective view of a grate and a furnace wall without dust.

FIG. 5 is a schematic view of an image of refuse being burned displayed on a computer monitor.

FIG. 6 is a schematic view of an image of a grate and a furnace wall region in a dust-free state displayed on a computer monitor.

FIG. 7 is a schematic diagram showing a relationship between three primary colors and other colors.

[Explanation of symbols]

 1 Garbage incinerator 2 Industrial color TV camera 3 Three primary color separation circuit 4 Computer 5 Computer monitor 6 Color TV for monitoring 7 Garbage 8 Grate 9 Burning area 10 Non-burning area 11 Furnace wall area 12 Boundary between grate and furnace wall area Line 13 1st intersection 14 2nd intersection 15 Garbage thickness 16 Burnout level

Claims (1)

[Claims] 1. An image of the inside of an incinerator is taken by a color television camera, a color image signal obtained from the color television camera is separated by a three-primary-color separation circuit into signals of three primary colors of red, green, and blue. Multi-valued for the strength of
The image signal is classified into one of a plurality of preset colors with respect to the ratio of the intensity of the three primary colors, a preset burning region,
It is determined which of the colors of the non-combustion area and the furnace wall area corresponds, and the burn-out level at which the color change from the combustion area to the non-combustion area occurs is detected. 1 intersection is detected, the boundary line between the preset grate and the furnace wall and the second intersection where the perpendicular from the first intersection intersects are detected, and the distance from the first intersection to the second intersection is determined, A method for detecting dust thickness, comprising detecting the thickness of dust in contact with a furnace wall at a combustion end point.