JP3669781B2 - Combustion control method for garbage incinerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combustion control method for a garbage incinerator, and more particularly, to a combustion control method in a garbage incinerator including a movable fire bed disposed with a step so that the downstream side is lowered.
[0002]
[Prior art]
An example of a waste incinerator to which a conventional combustion control method is applied is shown in FIG. 3. As shown in FIG. The movable firebed 5 includes a drying zone A for drying garbage sent by the pusher 3, a combustion zone B for burning garbage dried in the drying zone A, and the combustion zone B. The region is divided into a post-combustion zone C for ashing the combustion residue of the burned garbage. The movable fire bed 5 has a two-stage structure in which a dry zone fire bed 5A that transports the dust pushed in and supplied by the pusher 3 while drying, and a waste zone fire bed 5A that transports the dust dried in the dry zone fire bed 5A while burning it. A step is formed so that the downstream combustion zone firebed 5B and the post-combustion zone firebed 5C that transports the waste combusted in the combustion zone firebed 5B while ashing and discharges it to the ash treatment section are lowered on the downstream side. It is provided and connected. Control means 11 for controlling the combustion of the dust is provided, and each movable fire bed 5 is PID-controlled by the transport control unit 11 b of the control means 11. A wind box 6 is provided below each fire bed 5, and an air supply path 6 b for supplying supply air from the push-in air blowing mechanism 6 a is connected to the wind box 6. Each of the air supply paths 6b is provided with a damper mechanism 6c, and PID control is performed from the air blowing control unit 11a of the control means 11.
[0003]
The trash sent to the movable firebed 5 by the pusher 3 is on the downstream side of the drying zone firebed 5A while drying the supply air from the drying zone wind box 6A provided below it as drying air. To the subsequent combustion zone fire bed 5B. The supplied garbage primarily burns on the combustion zone firebed 5B, using the supply air from the combustion zone wind box 6B provided therebelow as combustion air, and the generated combustion gas is secondary formed above. Secondary combustion occurs in contact with the secondary air in the combustion space 7. The combustion exhaust gas that has reached a high temperature generates steam from the heat recovered by the waste heat boiler 8 provided in the downstream space of the secondary combustion space 7 and is discharged from the chimney 10 through the waste gas treatment device 9 into the atmosphere. The The steam generated in the waste heat boiler 8 is supplied to a power generator to generate electric power. The garbage conveyed while burning completes flame combustion on the combustion zone fire bed 5B, and the combustion residue falls onto the subsequent post combustion zone fire bed 5C. On the post-combustion zone firebed 5C, the combustion residue from the combustion zone firebed 5B is conveyed while continuing solid combustion using the supply air from the post-combustion zone wind box 6C provided below, as combustion air, and ash And is discharged from the downstream end of the post-combustion zone firebed 5C to the ash treatment facility.
[0004]
In the above-mentioned refuse incinerator, the combustion state of dust is estimated from the temperature in the furnace and the components of combustion exhaust gas, and the amount of combustion air based on the burn-off position P detected based on the input visible image from the imaging means 1 Or the automatic control which sets the conveyance speed of the movable fire bed 5 was performed. That is, the imaging means 1 that captures and inputs a flame image of the combustion zone fire bed 5B in the subsequent stage is provided on the furnace wall portion on the downstream side of the movable fire bed 5, and the flame image is subjected to image analysis, An image processing means 2 for detecting the downstream end of the flame on the subsequent combustion zone fire bed 5B as the burn-off position P is provided, and the detection result is input to the control means 11 to detect the detected burn-off position. The conveyance speed of the subsequent combustion zone fire bed 5B or the subsequent combustion zone fire is set so that P is approximately 80% of the transport direction length from the most upstream end of the subsequent combustion zone fire bed 5B. The amount of combustion air to the combustion zone wind box 6B provided on the floor 5B was PID controlled.
[0005]
[Problems to be solved by the invention]
In the combustion control of the conventional garbage incinerator described above, the control is performed based on the temperature in the furnace and the components of the combustion exhaust gas as a result of the combustion of the garbage, and the burn-off position P on the combustion zone fire bed 5B. Therefore, the process information for control has a time delay, and the follow-up control is performed. In particular, the burn-off position indicates the result of the combustion of garbage on the combustion zone fire bed 5B, and information relating to the quality of the garbage during combustion (ease of burning garbage, retained moisture, etc.) Therefore, it is not information that makes it possible to predict the variation of the subsequent fuel cut-off position. As a result, it was difficult to cope with the actual combustion situation. Furthermore, only the image processing of the flame image input from the imaging means 1 is not sufficient in the accuracy of the detected burnout position, and it is difficult to determine the combustion control condition according to the dust quality. That is, in the above-described combustion control, since the amount of unburned garbage is not grasped, the detected burn-off position P must be controlled upstream, and unburned garbage is discharged together with ash. The problem was that it was impossible to take measures to prevent this from happening.
Therefore, the present invention provides a combustion control method for a waste incinerator that solves the above-described problems and can prevent unburned waste from being discharged together with ash while optimizing the amount of waste incineration. For the purpose.
[0006]
[Means for Solving the Problems]
[First feature configuration]
The first characteristic configuration of the combustion control method of the refuse incinerator of the present invention for the above-described object is the first imaging means for inputting a visible image of visible wavelength light in the combustion region, and the combustion as claimed in claim 1 A second imaging means for inputting an infrared image of the infrared wavelength light of the region is provided at the downstream side of the movable fire bed in the dust transport direction, and the input visible image is subjected to image processing to obtain a flame area. Then, the input infrared image is image-processed to determine a dust cross-sectional area on the movable firebed, and a value obtained by dividing the flame area by the dust cross-sectional area is used as a burnup index and compared with a predetermined reference index range. When the burnup index deviates downward from the reference index range, it is determined that the combustion is insufficient, and the conveyance of the movable firebed that detects the insufficient combustion is controlled to reduce the burnup index. When deviating upward from the reference index range , It is determined that excess combustion lies in that acceleration control of the transport of the movable grate which detects said combustion excess.
[Function and effect of the first characteristic configuration]
According to the first characteristic configuration, it is possible to completely burn the dust on the movable firebed while burning as much dust as possible in the combustion region. Specifically, the flame area (as an index of the amount of dust burning) obtained as a result of image processing of a visible image is used as the cross-sectional area of the garbage on the movable firebed (movable as a result of image processing of an infrared image). The value divided by the amount of unburned garbage on the fire bed will give a combustibility compared with the combustion state of garbage having a standard combustibility if a standard value is determined according to the standard waste. For example, it has been found that trash with many flammable components and low water content shows a high value, and trash with low flammability or high water content shows a low value. From this, for example, if the ratio of the flame area to the cross-sectional area of the dust is large and the cross-sectional area of the dust is small, it is estimated that the remaining combustion amount is small. The reverse is also true. In other words, based on the knowledge that the above value indirectly indicates the self-combustion ability of the garbage in the combustion process, which is potentially possessed for the subsequent ashing, it indicates the combustion state (complete burnup) compared with the complete combustion of the garbage. It is used as a burnup index. Since the transport speed of the movable fire bed is controlled by the size of the index, it is possible to perform control in response to the combustion state of the dust on the fire bed. For example, when it is determined that the combustion is insufficient, the dust conveyance speed is reduced to give a sufficient residence time to the dust on the movable firebed so that the dust is sufficiently burned. Also, for example, if it is determined that combustion is excessive, the speed at which the garbage is conveyed is increased, the amount of garbage incinerated on the movable firebed is increased, and the garbage combustion completion position (burn-off position) is set downstream. It is moved to. Incidentally, it is a new finding of the inventors that the value obtained by dividing the flame area by the cross-sectional area of the dust has a strong correlation with the complete burnup of the dust.
As a result, it has become possible to prevent unburned garbage from being discharged with ash by suppressing the discharge of unburned garbage to the downstream side of the combustion area while optimizing the amount of waste incinerated. .
[Second feature configuration and effect]
The second characteristic configuration of the combustion control method for a refuse incinerator according to the present invention is the movable feature that detects the insufficient combustion when it is determined in the first characteristic configuration that the combustion is insufficient. In this point, a measure is taken to increase the supply amount of combustion air supplied to the garbage on the fire bed, and the combustion of the garbage on the movable fire bed, which is delayed in combustion, is promoted.
As a result, even if unburned garbage is sent to the movable firebed on the downstream side of the afterburning region, it is possible to prevent the unburned garbage from being discharged together with ash.
[Third characteristic configuration and effect]
Further, the third characteristic configuration of the combustion control method for a refuse incinerator according to the present invention is that, as described in claim 3, when it is determined that combustion is insufficient in the first characteristic configuration or the second characteristic configuration, The point is to increase the amount of drying air supplied to the garbage on the upstream movable firebed, thereby improving the flammability of the garbage on the upstream side, and the burning of the garbage in the combustion region. Promoted.
As a result, it is possible to easily complete the combustion of dust in the combustion region, and to prevent unburned dust from being sent downstream.
[Fourth feature configuration and effects]
And the 4th characteristic structure of the combustion control method of the refuse incinerator of this invention, when it is judged that combustion is excessive in any one of the said 1st characteristic structure-3rd characteristic structure, as described in Claim 4, The measure is to reduce the amount of combustion air supplied to the garbage on the movable firebed that has detected overcombustion. It is possible to expand the combustion area to the downstream side of the fire bed. Therefore, it is possible to increase the amount of garbage incinerated on the movable firebed while preventing unburned garbage from being sent downstream.
As a result, it is possible to prevent the unburned garbage from being discharged together with the ash while suppressing the discharge of unburned garbage to the downstream side of the combustion region while optimizing the amount of garbage incinerated on the movable firebed. Became.
[0007]
[Fifth feature configuration]
The fifth characteristic configuration of the combustion control method of the refuse incinerator of the present invention for the above-described object is that, as set forth in claim 5, the drying zone for drying the introduced waste, and the waste dried in the drying zone A movable fire bed that is divided into a combustion zone for burning the waste and a post-combustion zone for ashing the combustion residue of the dust burned in the combustion zone, and arranged with steps so that the downstream side is lowered. A first imaging means for inputting an image of visible wavelength light in the combustion zone in a garbage incinerator, and a second imaging means for inputting an infrared image of infrared wavelength light in the combustion zone are provided on the movable firebed. The visible image of the combustion zone input by the first imaging unit is image-processed along with the downstream side in the dust conveyance direction to obtain a flame area, and the infrared image of the combustion zone input by the second imaging unit is obtained. Image processing to create a dust cross section Therefore, a value obtained by dividing the flame area on the image by the dust area on the image is used as a burnup index and compared with a predetermined reference index range, and the burnup index deviates downward from the reference index range. Is determined to be insufficient combustion, increases the amount of air supplied to the combustion zone firebed of the combustion zone, and if the burnup index deviates upward from the reference index range, it is determined that combustion is excessive, When the amount of air supplied to the combustion zone firebed is reduced and the infrared image of the post-combustion zone input by the second imaging means is processed to detect unburned garbage, it is determined that the combustion is excessive. In this case, the amount of air supplied to the combustion zone fire bed is increased, and at the same time, the conveyance speed of the combustion zone fire bed in the rear combustion zone is reduced.
[Function and effect of the fifth characteristic configuration]
According to the fifth characteristic configuration, as in the first characteristic configuration, it is possible to completely burn the dust on the combustion zone fire bed while burning as much dust as possible in the combustion region, and Enables prevention of unburned garbage from the combustion zone firebed. Specifically, a flame area obtained by image processing a visible image of a flame in a combustion zone where garbage burns in a flame, a cross-sectional area of the dust on the combustion zone fire bed obtained by image processing an infrared image of the combustion zone By using the value divided by the burnup index, and by controlling the conveyance speed of the combustion zone firebed according to the magnitude of the index, it becomes possible to correct before and after the burn-off position on the combustion zone, and further, the combustion zone By controlling the complete burnup by increasing / decreasing the amount of air supplied to the firebed, it becomes possible to suppress changes in the combustion region, and to enable control in response to the combustion state of the dust on the combustion zone firebed Become. For this reason, for example, when it is determined that the combustion is insufficient, the conveyance speed of the combustion zone fire bed is reduced to give sufficient residence time to the dust on the combustion zone fire bed, and further to the combustion zone fire bed. The amount of supplied air is increased to promote combustion and complete combustion of the garbage. In addition, for example, when it is determined that combustion is excessive, by suppressing the combustion by reducing the amount of air supplied to the combustion zone fire bed while accelerating the dust conveyance speed and increasing the amount of dust supplied, The incineration amount is increased by moving the garbage combustion completion position (burn-off position) to the downstream side. Here, in the case where unburned garbage that can be flame-combusted is detected on the post-combustion zone firebed where the combustion residue of solid waste is solid-combusted, the combustion of unburned waste on the post-combustion zone takes precedence over other controls. Since the suppression treatment is performed simultaneously with the promotion treatment, it is possible to complete the combustion of the detected unburned garbage.
As a result, it is possible to prevent the unburned garbage from being discharged together with the ash while suppressing the discharge of unburned garbage to the downstream side of the combustion region while optimizing the amount of garbage incinerated on the movable firebed. Became.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An example of an embodiment of the combustion control method for a refuse incinerator of the present invention will be described below with reference to the drawings.
As an example of the combustion control method of the present invention, as shown in FIG. 1, a case will be described in which the present invention is applied to a dust incinerator configured similarly to the dust incinerator shown in FIG. In the figure, the same elements, elements that exhibit the same function, or elements that have the same function are denoted by the same reference numerals as those in FIG.
[0009]
The movable firebed 5 of the garbage incinerator is provided with a control means 11 including a transport control unit 11b for controlling the transport speed by PID, and is controlled. Further, the control means 11 is provided with a blower control unit 11a for controlling the amount of air supplied to each wind box 6 provided below each movable fire bed 5. The control means 11 is provided with a drying zone control device 11A, a combustion zone control device 11B, and a post-combustion zone control device 11C in association with each other so that each of the movable firebeds 5 can be individually controlled. The combustion zone control device 11B is configured to be capable of individually controlling the two-stage combustion zone firebed 5B. The air blow control unit 11a and the transport control unit 11b are provided in each of the control devices 11A, 11B, and 11C.
[0010]
First imaging means 1A for detecting visible images of the flames of the combustion zone fire bed 5B and the rear combustion zone fire bed 5C on the downstream wall portion of the movable fire bed 5, and on the combustion zone fire bed 5B and the above An imaging means 1 comprising a second imaging means 1B for detecting an infrared image of dust on the rear combustion zone firebed 5C is provided. An image processing means 2 for analyzing an image input from the imaging means 1 is provided, and the image processing means 2 includes a first image analysis means for performing image processing on a visible image input from the first imaging means 1A. 2A, and a second image analysis unit 2B that performs image processing on the infrared image input from the second imaging unit 1B. Further, a combustion state analyzing means 12 for analyzing the combustion state of dust on the fire beds 5B and 5C based on the processing result of the image processing means 2 is provided, and control information for the control means 11 is issued. is there.
[0011]
In the first imaging means 1A, visible images including flames on the combustion zone fire bed 5B and the rear combustion zone fire bed 5C are taken and input to the first image analysis means 2A. The first image analysis means 2A divides the input visible image into three color component ratios (specifically, red (R component), green (G component), and blue (B component)). 2), a flame image as shown in FIG. 2A is extracted, and information based on the extracted flame image is sent to the combustion state analysis means 12. input.
[0012]
The second image pickup means 1B picks up an infrared image having the same field of view as the first image pickup means 1A and inputs it to the second image analysis means 2B. The infrared wavelength to be imaged is 3.9 μm representing the internal temperature of dust. This is a thermal image after flame removal, and for this purpose, the wavelength is selected as the flame removal filter. In order to avoid the influence of infrared absorption of carbon dioxide, the second imaging means 1B is provided with a filter having an absorption wavelength band of 4.4 μm (including an infrared absorption band of carbon monoxide). It is attached to. This infrared wavelength region is a region where an infrared image ranging from the temperature region of the fire bed 5 to the flame temperature region can be clearly captured and can be distinguished between different temperature regions. In the second image analysis means 2B, the input infrared image is analyzed based on temperature (specifically, thermal image data of thermography), and dust under a flame as illustrated in FIG. The image of the cross sectional shape is binarized and extracted, and information based on the extracted dust cross sectional image is input to the combustion state analyzing means 12. The extraction of the dust cross-sectional image will be described in detail. Since the temperature of the dust mass on the fire bed 5 is higher than the temperature of the fire bed 5 and the temperature of the furnace wall, the temperature level for binarization (for example, 600 ° C.). ). Among the pixels of the entire thermal image (for example, 320 × 240 pixels), a high temperature portion of 10 pixels or more continuously in the vertical direction and the horizontal direction is recognized as a dust lump area. For this reason, the surface image of the dust lump is close to the dust cross section at a position near the viewpoint of the second imaging means 1B on the extension of the fire bed surface of the combustion zone fire bed 5B.
[0013]
The combustion state analyzing means 12 obtains the area of the flame image input from the first image analyzing means 2A, obtains the area of the dust cross-sectional image input from the second image analyzing means 2B, and determines the area of the flame image. A burnup index value is obtained as a combustion state index for the complete combustion state by dividing the area by the area of the dust cross section, and compared with a reference index range set in advance as an allowable range based on actual measurement values. Based on the comparison result, when the acquired burnup index is within the reference index range, a normal combustion signal is generated, and when the burnup index deviates downward from the reference index range, that is, to the detected flame area. If the amount of debris under the flame is larger than that of the combustion failure signal, the flame amount is larger than the detected debris cross-sectional area when the burnup index deviates upward from the reference index range. If there are many, an excessive combustion signal is issued to the control means 11, respectively. Further, when an image of the dust cross section is detected on the rear combustion zone firebed 5C, a combustion delay signal is issued to the control means 11.
[0014]
In the control means 11, while the normal combustion signal is received from the combustion state analysis means 12, the transport control provided in each of the drying zone control device 11A, the combustion zone control device 11B, and the rear combustion zone control device 11C. In the same manner as in the prior art, the part 11b performs PID control of the conveying speed of the dry zone fire bed 5A, the combustion zone fire bed 5B, and the post combustion zone fire bed 5C using the furnace temperature and the components of the combustion exhaust gas as process signals. If necessary, air supply to each of the dry zone wind box 6A, the combustion zone wind box 6B, and the post combustion zone wind box 6C is performed by the air blow control unit 11a included in each of the control devices 11A, 11B, and 11C. The damper mechanism 6c provided in the path 6b is operated.
[0015]
With the above configuration, the waste incinerator is controlled as follows. That is, when the combustion failure signal is received from the combustion state analysis means 12, first, a positive correction amount signal is given to the PID calculation by the blower control unit 11a of the combustion zone controller 11B, and the combustion zone ignition is performed. The amount of combustion air supplied to the floor 5B is increased to promote the combustion of dust on the combustion zone fire bed 5B. And when receiving the said combustion failure signal continuously, a positive correction amount signal is given to the PID calculation by the ventilation control part 11a of the said drying zone control apparatus 11A, and it is for drying supplied to the said drying zone firebed 5A The air is increased to promote the drying of the garbage on the dry zone firebed 5A, that is, the waste to be supplied to the combustion zone firebed 5B, thereby improving the flammability of the dust on the combustion zone firebed 5B. . This control is not immediately effective and has a time delay. However, if the garbage promoted to dry is supplied onto the combustion zone firebed 5B, it is possible to eliminate the combustion failure. It is effective as a control. Furthermore, if the combustion failure signal is not eliminated even by the control operation by the blower control unit 11a, a negative correction amount signal is applied to the PID calculation by the transport control unit 11b of the drying zone control device 11A and the combustion zone control device 11B. To reduce the transport speed of the dry zone fire bed 5A and the combustion zone fire bed 5B, retreat the waste burn-off position of the combustion zone fire bed 5B to the upstream side, and burn off due to poor combustion Make room for further advancement downstream of the position.
[0016]
Further, when the excessive combustion signal is received from the combustion state analyzing means 12, first, a negative correction amount signal is given to the PID calculation by the blower control unit 11a of the combustion band control device 11B, and the combustion band ignition is performed. The amount of combustion air supplied to the floor 5B is reduced to suppress the combustion of dust on the combustion zone fire bed 5B.
[0017]
Further, when the combustion delay signal is received from the combustion state analyzing means 12, a positive correction amount signal is given to the PID calculation by the blower control unit 11a of the combustion zone control device 11B in preference to the above-described controls. To increase the amount of combustion air supplied to the combustion zone firebed 5B and promote the combustion of garbage on the combustion zone firebed 5B to prevent unburned waste from being sent to the post-combustion firebed 5C At the same time, a negative correction amount signal is given to the PID calculation by the transfer control unit 11b of the post-combustion zone control device 11C to reduce the transfer speed of the post-combustion zone fire bed 5C, and from the combustion zone fire bed 5B to the above-mentioned The unburned garbage is prevented from being discharged from the post-combustion zone firebed 5C while suppressing the sending of unburned dust to the post-combustion zone firebed 5C.
[0018]
Next, another embodiment of the present invention will be described.
<1> In the above-described embodiment of the present invention, when a combustion failure signal is received, the supply amount of combustion air from the combustion zone wind box 6B is increased to promote combustion, and then the dry zone wind box 6A. Although the example of increasing the supply amount of the drying air from has been shown, the preheating temperature of the drying air may be increased. This is delayed as compared with the increase in the supply amount of the combustion air, but is effective as an advance control in the case of poor combustion due to changes in the quality of dust.
<2> In the above embodiment of the present invention, an example in which the supply amount of combustion air from the combustion zone wind box 6B is reduced to suppress combustion when receiving an excessive combustion signal is shown. The amount of air supplied may be reduced, or the preheating temperature of the drying air may be lowered to suppress the drying of garbage sent to the combustion zone fire bed 5B. As a result, on the combustion zone fire bed 5B You may make it suppress later combustion. This delays the appearance of the effect as compared with the decrease in the supply amount of the combustion air, but is effective as a preceding control in the case of excessive combustion accompanying a change in the quality of dust.
<3> In the above-described embodiment of the present invention, when a combustion failure signal is received, the supply amount of combustion air from the combustion zone wind box 6B is increased to promote combustion, and then the dry zone wind box 6A. Although an example of increasing the supply amount of drying air from the above is shown, the increase in the supply amount of combustion air and the supply amount of drying air may be performed simultaneously.
<4> A decrease in the supply amount of drying air in <2> above and a decrease in the preheating temperature of the drying air may be used in combination, and these may be used in combination with an increase in the supply amount of combustion air. Alternatively, it may be performed sequentially in the order of immediate effect.
<5> In the above-described embodiment of the present invention, an example in which the infrared wavelength imaged by the second imaging unit 1B is 3.9 μm has been shown. This is a bandpass having a wavelength representative of the internal temperature of the dust layer. The filter is used as a flame removal filter, and can be used as long as it is less affected by the absorption band of carbon dioxide and carbon monoxide and transmits the flame. In this case, naturally, the absorption wavelength band of the filter needs to be changed. In addition, an infrared image in a specific wavelength region, for example, 3.6 to 4.6 μm may be captured.
<6> In the above-described embodiment, an example in which, in the extraction of the dust cross-sectional image, an area in which pixels having a temperature equal to or higher than the binarization level value are continuous for 10 pixels or more in the vertical direction and the horizontal direction is determined as the dust lump area. However, the number of continuous pixels is determined in accordance with the characteristics of the imaging means, and is not limited to the above.
[0019]
In addition, although the code | symbol is written in order to make contrast with drawing convenient for the term of a claim, this invention is not limited to the structure of an accompanying drawing by this entry.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an example of a waste incinerator to which the present invention is applied. FIG. 2 is an explanatory diagram of an example of an image processing result. FIG. Explanation of symbols]
1A 1st image pickup means 1B 2nd image pickup means 5 Movable fire bed 5B Combustion zone fire bed A Dry zone B Combustion zone C Post combustion zone

Claims (5)

In a garbage incinerator comprising a movable firebed (5) arranged with a step so that the downstream side is low,
A first imaging means (1A) for inputting a visible image of visible wavelength light in the combustion area and a second imaging means (1B) for inputting an infrared image of infrared wavelength light in the combustion area are provided with the movable fire bed ( 5) Attached to the downstream side in the dust transport direction, the input visible image is image-processed to obtain a flame area, and the input infrared image is image-processed to generate dust on the movable firebed (5). When a cross-sectional area is obtained, a value obtained by dividing the flame area by the dust cross-sectional area is compared with a predetermined reference index range as a burnup index, and the burnup index deviates downward from the reference index range Determines that the combustion is insufficient, decelerates the conveyance of the movable fire bed (5) that detects the insufficient combustion, and if the burnup index deviates upward from the reference index range, A movable firebed that detects and detects excessive combustion Combustion control method for waste incinerators that acceleration control of the transport of 5). The refuse incinerator according to claim 1, wherein when it is determined that the combustion is insufficient, a measure is performed to increase a supply amount of combustion air supplied to the garbage on the movable firebed (5) where the insufficient combustion is detected. Combustion control method. 3. The method according to claim 1, wherein when it is determined that the combustion is insufficient, a measure is performed to increase a supply amount of drying air supplied to garbage on the movable firebed (5) on the upstream side of the combustion region. Combustion control method for garbage incinerators. 4. The method according to any one of claims 1 to 3, wherein when it is determined that the combustion is excessive, a treatment is performed to reduce a supply amount of combustion air supplied to garbage on the movable fire bed (5) that detects the combustion excess. Control method for garbage incinerators. The drying zone (A) for drying the input waste, the combustion zone (B) for burning the dust dried in the drying zone (A), and the combustion residue of the waste burned in the combustion zone (B) are ashed In a refuse incinerator comprising a movable fire bed (5) that is divided into a post-combustion zone (C) to be converted and is provided with a step so that each downstream side is lowered,
First imaging means (1A) for inputting an image of visible wavelength light in the combustion band (B), and second imaging means (1B) for inputting an infrared image of infrared wavelength light in the combustion band (B). In addition to determining the flame area by image processing the visible image of the combustion zone (B) input by the first imaging means (1A), in addition to the downstream side of the movable fire bed (5) in the direction of dust conveyance. The infrared image of the combustion zone (B) input by the second imaging means (1B) is image-processed to obtain a dust cross-sectional area, and a value obtained by dividing the flame area on the image by the dust area on the image As an index, it is compared with a predetermined reference index range, and when the burnup index deviates downward from the reference index range, it is determined that combustion is insufficient, and the combustion zone bed of the combustion zone (B) (5B) is increased, the burnup index is When deviating upward from the semi-index range, it is determined that combustion is excessive, the amount of air supplied to the combustion zone fire bed (5B) is reduced, and the post-combustion input by the second imaging means (1B) When the infrared image of the belt (C) is image-processed and unburned dust is detected, the amount of air supplied to the combustion zone fire bed (5B) is increased in preference to the case where it is determined that the combustion is excessive. At the same time, a combustion control method for a refuse incinerator that reduces the conveying speed of the combustion zone firebed (5B) of the rear combustion zone (C).

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