JP4036768B2 - Combustion control device for incinerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combustion control device for an incinerator that incinerates garbage, and in order to maintain the amount of garbage in the furnace within an appropriate range, in particular, the target incineration amount of garbage to be incinerated in the furnace and supply of garbage to the furnace. The reference operation speed of the dust supply means is determined based on the dust supply efficiency representing the dust supply amount of the dust supply means (for example, the dust supply amount per one reciprocation of the dust supply device for supplying dust by repeating the reciprocating operation). The present invention relates to a combustion control device for an incinerator provided with a control means for determining and controlling the operation of the dust supply means based on the reference operation speed.
[0002]
[Prior art]
In the first related art related to the combustion control device for the incinerator, the steam generation amount of the waste heat boiler, the luminance information of the ITV image for monitoring the combustion state in the furnace, the pressure below the post-combustion grate and the pressure in the furnace Based on the pressure difference, post-combustion grate temperature, and main flue temperature, control the grate speed, grate stroke length, and post-combustion air damper to achieve stable steam generation and reduction of unburned garbage (See Patent Document 1).
[0003]
In the second prior art, the dust supply efficiency (actual dust supply amount per round trip of the dust supply device) is estimated from the history of the operation speed of the dust supply means for supplying the dust into the furnace and the supply amount of the dust. The target dust incineration amount was realized while controlling to an appropriate dust supply speed according to the change in dust quality determined based on the dust supply efficiency (see Patent Document 2).
[0004]
In the third prior art, the inside of the hopper is measured with a laser distance meter to calculate the volume of the input waste, and the specific gravity of the waste is obtained from the input waste volume and the separately measured input weight. The amount of heat generated (the amount of heat supplied in the furnace) was estimated, and the dust supply speed was controlled so as to keep the amount of heat supplied in the furnace constant (see Non-Patent Document 1).
[0005]
[Patent Document 1]
JP-A-10-332121 (page 2-9, FIGS. 1 to 12)
[Patent Document 2]
JP 7-269834 A (page 2-4, FIGS. 1 to 4)
[Non-Patent Document 1]
Shinichi Enomoto and two others, “Control of Waste Heat Supply in Incinerator”, Journal of Society “EICA”, October 31, 2002, Vol. 7, No. 2 (2002), p. 75-78
[0006]
[Problems to be solved by the invention]
However, in the first prior art, since the dust supply speed into the furnace is not controlled, when the amount of dust in the furnace becomes excessive, the speed and stroke length of the grate are controlled to control the dust layer. Although it is possible to change the layer thickness balance, there is an inconvenience that unburned garbage is generated because the amount of refuse held in the furnace is not reduced if the dust supply speed is the same. In other words, if the steam generation rate falls below the target, the waste feed rate will always increase, so the amount of waste in the furnace will increase rapidly for waste with low air permeability, resulting in a further decrease in air permeability and combustion. I had the problem of getting worse.
[0007]
In the second prior art, the reference operation speed of the dust supply means is obtained from the target dust incineration amount and dust supply efficiency, and the actual operation speed of the dust supply means is controlled to the reference operation speed. In contrast, when the target waste incineration amount is set high, there is a possibility that the waste exceeding the incineration processing capacity of the furnace may be supplied.
Also in the third prior art, because of the constant control of the amount of heat supplied, as in the case of the second prior art, when the heat generation amount of the dust is low, the target waste incineration amount is set high as a result, and the furnace incineration is performed. There was a possibility of supplying garbage exceeding the processing capacity.
[0008]
The present invention has been made in view of the above circumstances, and an object of the present invention is to avoid deterioration of the combustion state due to excessive supply or insufficient supply of dust into the furnace and realize stable combustion. An object of the present invention is to provide a combustion control device for an incinerator.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 of the combustion control device of the incinerator for realizing the above object represents the target incineration amount of the waste to be incinerated in the furnace and the dust supply amount of the dust supplying means for supplying the waste into the furnace. obtains a reference operation speed of the paper dust means based on Kyuchiri efficiency, there is a control means for controlling the operation of the paper dust means based on the reference operating speed is provided, the characterizing feature is, the furnace The actual operating speed of the dust supply means is obtained by correcting the reference operating speed based on a combustion index representing the combustion state of dust in the interior, and the actual value of the incineration amount or the actual value of the incineration amount and the dust In limiting the actual operation speed so that the amount of dust supplied to the furnace is within an appropriate range with respect to the incineration processing capacity of the furnace based on both of the estimated values of the calorific value of, the control means, Set multiple combustion patterns as combustion indicators When one of the plurality of combustion patterns continuously appears, a cumulative correction factor for accumulating or increasing the correction factor for correcting the reference operation speed is obtained, and the actual value of the waste incineration amount or the waste incineration amount is obtained. The cumulative correction factor is limited by the upper limit value and the lower limit value set based on both the actual value and the estimated value of the amount of heat generated from the dust, and the reference operation speed is corrected using the cumulative correction factor to The point is to determine the operating speed .
[0010]
In other words, based on the combustion index, when it is predicted that there will be a shortage of garbage in the furnace, the actual operating speed of the dust supply means will be increased by correcting the standard operating speed to an increase side so that there is no shortage of garbage in the furnace. On the other hand, when it is expected that the amount of dust in the furnace will be excessive, the actual operating speed of the dust supply means is reduced by correcting the reference operating speed to a decreasing side so that the dust in the furnace does not become excessive.
Further, based on both the actual value of the incineration amount or the actual value of the incineration amount and the estimated value of the heat generation amount of the waste, for example, the actual value of the incineration amount in the past 1 to 2 hours with respect to the rated combustion pace. Is large, the actual operation speed of the dust supply means is limited to a low speed so that the amount of dust supplied to the furnace does not deviate from the upper limit of the appropriate range for the incineration capacity of the furnace. When the actual amount is small, limit the actual operating speed of the dust supply means so that the amount of dust supplied to the furnace does not deviate from the lower limit of the appropriate range of the incineration capacity of the furnace. .
[0011]
Therefore, the actual operating speed is obtained by correcting the reference operating speed of the dust supply means determined based on the target waste incineration amount and dust supply efficiency according to the combustion state of the dust in the furnace, and further supplying the dust. The actual operation speed of the dust supply means is limited based on the actual value of the incineration amount so that the amount falls within the appropriate range for the incineration capacity of the furnace. A combustion control device for an incinerator capable of avoiding deterioration of the combustion state due to insufficient supply and realizing stable combustion is provided.
[0013]
That is, the plurality of combustion patterns represent different combustion states such as the amount of heat generated by combustion and the amount of dust held in the furnace. For example, the amount of steam generated exceeds the target, and the fuel cutoff point is upstream of the dry zone side. If the combustion pattern located at continually appears, the heat generation amount of dust rises and the combustion speed is judged to be fast, and the cumulative correction factor is cumulatively increased, while the steam generation amount is reduced and the combustion rate is reduced. If the combustion pattern where the cut point is located downstream of the post-combustion side appears continuously, it is determined that the waste heat generation amount will fall and the combustion speed will be slow, and this cumulative correction factor will be accumulated and reduced. Reflecting the stable combustion state in the furnace or a gradual change in the combustion state in the correction factor, an appropriate actual operation speed can be obtained, and the amount of dust supply is within the appropriate range for the incineration processing capacity of the furnace. Rated combustion to fit into Since the upper limit value and the lower limit value are limited to the cumulative correction rate based on the actual value of the amount of garbage incinerated with respect to the waste, even if one of the combustion patterns continues, the actual operating speed of the dust supply means is the appropriate speed. It will not deviate greatly from.
Therefore, it is possible to easily and appropriately obtain the actual operation speed from the reference operation speed of the dust supply means using two parameters of a plurality of combustion patterns and cumulative correction factors, which is suitable for a combustion control apparatus for an incinerator. Embodiments are provided.
[0014]
A characteristic configuration of the invention according to claim 2 is that, in the invention according to claim 1, when the control means corrects the reference operation speed, one of the combustion patterns appears in addition to the cumulative correction rate. It lies in using a temporary correction factor to temporarily set the correction factor for correcting the reference operation speed when.
[0015]
According to the above configuration, the control unit temporarily sets a temporary correction factor when one of the plurality of combustion patterns appears, and uses both the temporary correction factor and the cumulative correction factor. The actual operation speed of the dust supplying means is obtained by correcting the reference operation speed. That is, unlike the cumulative correction factor, the temporary correction factor is set only when one of the plurality of combustion patterns appears once, so that, for example, the amount of steam rises and shows a sudden change to excessive combustion. When the combustion pattern appears and it is necessary to rapidly reduce the dust supply speed, the cumulative correction factor that increases or decreases as the value accumulates cannot be handled, but by temporarily setting a large value for the temporary correction factor, The actual operation speed of the dust supplying means can be surely limited in response to the sudden change in the combustion state.
Therefore, by using the temporary correction factor in addition to the cumulative correction factor, it is possible to appropriately set the actual operation speed of the dust supply means even for a sudden change in the combustion state in the furnace, and the incinerator A preferred embodiment of a combustion control device is provided.
[0016]
According to a third aspect of the present invention, in the invention according to the first or second aspect , the control means includes, as the plurality of combustion patterns, an evaluation index of the amount of heat generated in the furnace and the amount of dust accumulated in the furnace. The two-dimensional matrix information combined with the evaluation index is used.
[0017]
It is difficult to determine whether the combustion state of the waste in the furnace is appropriate only by the amount of heat generated in the furnace. For example, when the amount of generated heat is small, the cause of the small amount of heat generation is defective combustion of the waste in the furnace. However, it is not possible to determine whether the amount of dust in the furnace is small, but by combining the amount of heat generated in the furnace and the amount of dust in the furnace, for example, the amount of dust in the furnace is not small. Nevertheless, when the amount of generated heat is small, it can be determined that the waste in the furnace is poorly burned due to a decrease in air permeability.
Therefore, by combining information on the amount of heat generated in the furnace and the amount of accumulated dust in the furnace as the plurality of combustion patterns, it is possible to appropriately determine whether or not the garbage in the furnace is in an appropriate combustion state. It is possible to appropriately set the actual operation speed of the dust supply means according to the combustion state in the inside, and a preferred embodiment of the combustion control device for the incinerator is provided.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an incinerator combustion control apparatus according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a bucket 1 that picks up and conveys the dust accumulated in the garbage pit 20, a hopper 2 into which the garbage picked up by the bucket 1 is put, and an incinerator 3 for removing the dust in the hopper 2. A pusher mechanism 4 as dust supplying means that reciprocates to push in and supply, a stoker-type incineration treatment zone 5 that incinerates while conveying dust supplied into the furnace by the pusher mechanism 4, and this incineration treatment An ash pit 6 for recovering incinerated ash from the belt 5, a steam turbine 8 to which steam is supplied from a waste heat boiler 7 for recovering heat generated in the furnace, and power generation driven by the steam turbine 8 The waste incineration equipment is configured so that the exhaust gas from the incinerator 3 is processed by the exhaust gas processing unit 10 having a bag filter or the like and then discharged from the chimney 11. .
[0019]
Although not shown in the drawings, the steam from the waste heat boiler 7 is heated in a steam heater disposed in a flue for sending the exhaust gas from the incinerator 3 and is stored in a steam reservoir in a dry vaporized state. A steam cycle is configured such that steam from the steam reservoir is supplied to the steam turbine 8 to drive the generator 9, and then condensate and finally return to the waste heat boiler 7. In addition, a steam amount sensor 14 that detects the amount of generated steam is provided in a steam path that is supplied from the waste heat boiler 7 to the steam turbine 8.
[0020]
The incineration zone 5 includes a drying zone 5a that dries the supplied dust from the upper side (the pusher mechanism 4 side) along the direction of dust transport in the furnace and heats it to near the ignition point. A combustion treatment zone 5b for burning garbage and a post-combustion treatment zone 5c for ashing the burned waste are sequentially arranged. Each of the treatment zones 5a, 5b, and 5c is formed in a staircase shape so that the incineration treatment zone 5 has a lower level toward the lower side in the transport direction. Each processing zone 5a, 5b, 5c has a fixed grate in a fixed state and a movable grate slidable with respect to the fixed grate, and the movable grate is fixed by operation of a hydraulic cylinder (not shown). The dust on the incineration zone is slid back and forth with respect to the grate, and the dust is agitated while being sequentially transferred in the directions of the drying zone 5a, the combustion zone 5b, and the post-burn zone 5c. The dust ashed in the post-combustion treatment zone 5 c falls on the site of the ash pushing mechanism 12 and is conveyed and accumulated in the ash pit 6 by the ash removal conveyor 13.
[0021]
Below the incineration zone 5 is supplied primary combustion air for promoting the combustion of garbage. Specifically, a plurality of flow paths 22 are connected to a plurality of wind boxes 23 arranged below the respective treatment zones 5a, 5b, 5c, and each of the flow paths 22 needs to be blown by a blower (not shown). In response to this, heated air is supplied. The air supplied to each flow path 22 passes through the treatment zones 5a, 5b, and 5c from the wind box 23 to promote the combustion of dust.
[0022]
Also, secondary combustion air supply means for supplying secondary combustion air to the interior of the furnace above the incineration treatment zone 5 in order to cause secondary combustion of the combustion gas generated with combustion of garbage in the incinerator 3 27 is provided. An oxygen concentration sensor 26 for detecting the oxygen concentration in the exhaust gas after the secondary combustion is installed in the flue of the exhaust gas from the incinerator 3, and further, the exhaust gas at the furnace outlet position of the incinerator 3 A gas temperature sensor 25 such as a thermocouple that measures the temperature, that is, the furnace outlet temperature, is provided.
[0023]
A television camera 15 for detecting the position of the burnout point of the garbage in the incineration treatment zone 5 is installed on the furnace wall on the rear combustion zone side opposite to the position of the pusher mechanism 4 of the incinerator 3. Specifically, as shown in FIG. 2, the television camera 15 sets a combustion processing zone 5 b where a burnout point mk indicating a gas combustion end of dust is located in the furnace as an imaging range. Then, an image processing unit provided in a control device 30 (see FIG. 3) to be described later binarizes the image data of the TV camera 15 other than the flame and the flame to extract the combustion flame, and the downstream side of the combustion flame. The end is determined to be the burnout point mk.
[0024]
As shown in FIG. 3, a control device 30 composed of a microprocessor, a semiconductor memory, and the like is provided. The control device 30 includes the vapor amount sensor 14, the television camera 15, a gas temperature sensor 25, and an oxygen concentration sensor 26. And each detection information of the weight sensor 24 (refer FIG. 1) which detects the weight of the waste picked up by the said bucket 1 and thrown in in a furnace is input. On the other hand, the control device 30 outputs drive signals for the bucket 1, the pusher mechanism 4, and the like.
[0025]
In the control device 30, dust supply efficiency calculating means D for calculating dust supply efficiency representing the amount of dust supplied per cycle of the pusher mechanism 4 for supplying dust into the furnace is configured. The dust supply efficiency is estimated from the operating speed of the pusher mechanism 4 and the actual value of the amount of dust input. Specifically, assuming a certain amount of dust that stays from the hopper 2 to the combustion treatment zone 5 and is expected to enter the drying and combustion process in the future, the pusher at a predetermined time required to input the amount of dust is assumed. The dust input efficiency (ton / cycle) is obtained by dividing the input weight (ton / hour) of dust by the mechanism 4 by the moving average value of the operating speed (cycle / hour) of the pusher mechanism 4 at the same predetermined time. .
[0026]
In addition, based on the target incineration amount (hereinafter referred to as target incineration pace) of dust to be incinerated in the furnace and the dust supply efficiency calculated by the dust supply efficiency calculation means D in the control device 30 as shown in the following equation. A control means C is provided for obtaining a reference operating speed Vk (cycle / time) of the pusher mechanism 4 and controlling the operation of the pusher mechanism 4 based on the reference operating speed Vk. The coefficient K in the equation is set to a value in the range of 1.1 to 1.3, for example.
[0027]
[Expression 1]
Vk = K ・ Target incineration pace (ton / hour) / dust supply efficiency (ton / cycle)
[0028]
Further, the control means C obtains the actual operating speed Vj of the pusher mechanism 4 by correcting the reference operating speed Vk on the basis of a combustion index indicating the combustion state of dust in the furnace. Based on the actual value, the actual operation speed Vj is limited so that the amount of dust supplied to the furnace is within an appropriate range with respect to the incineration processing capacity of the furnace. This will be described below.
[0029]
Explaining the control configuration for limiting the actual operating speed Vj of the pusher mechanism 4, the control means C sets a plurality of combustion patterns as the combustion index, and one of the plurality of combustion patterns appears continuously. In this case, the cumulative correction rate H1 that increases or decreases cumulatively and the temporary correction rate H2 that is temporarily set when one of the plurality of combustion patterns appears is obtained, and the actual value of the incineration amount is obtained. The actual operation speed Vj is obtained by correcting the reference operation speed Vk using the accumulation correction ratio H1 and the temporary correction ratio H2 while limiting the accumulation correction ratio H1 with the upper limit value and the lower limit value set based on the upper limit value and the lower limit value. ing.
[0030]
The control means C uses, as the plurality of combustion patterns, two-dimensional matrix information that combines an evaluation index for the amount of heat generated in the furnace, such as a steam amount and a fuel cutoff point mk, and an evaluation index for the amount of debris in the furnace. Use. Specifically, as shown in FIG. 4, the amount of heat generated in the furnace is the amount of generated steam detected by the steam amount sensor 14 (deviation of steam amount from an appropriate value), and the amount of dust staying in the furnace is Position information of the fuel cut point mk detected by the TV camera 15 (position from the tip when the length of the combustion treatment zone 5b is 100%, and whether it is upstream or downstream relative to the appropriate position) No.) and No. Six combustion patterns 1 to 6 are set. Therefore, the higher the steam amount deviation from the negative side to the positive side, the higher the combustion level with a larger total heat generation amount, and the higher the level of the in-furnace waste amount, the higher the fuel cut point mk located on the downstream side.
[0031]
An example in which the gain (%) of the increase or decrease of the cumulative correction factor H1 and the gain (%) of the temporary correction factor H2 in the control cycle are set for the above six combustion patterns is shown in FIG. In FIG. 5, No. which is a high combustion level. For the combustion patterns 1 and 2, in order to prevent the amount of dust from being consumed suddenly due to combustion and causing a shortage of dust, a positive value is set as the gain of the cumulative correction factor H1, and the dust feed amount is set to In order to suppress the amount of steam by rapidly decreasing, a large negative value is set as the gain of the temporary correction factor H2.
[0032]
FIG. 6 shows an example of obtaining the cumulative correction rate H1 (%) and the temporary correction rate H2 (%) with respect to the change from the combustion pattern 4 to 5. In this example, the temporary correction factor H2 is set to 20% when the combustion pattern 4 changes to 5 (time 0), and when the same combustion pattern 5 continues, 0% with a control period of 5 minutes. On the other hand, when the same combustion pattern 5 continues, the cumulative correction rate H1 decreases by 5% in a control period of 5 minutes, so the correction rate obtained by adding the temporary correction rate H2 and the cumulative correction rate H1 is thick in the figure. As indicated by the solid line, it temporarily increases to 20% at the beginning and then decreases to -5% (95%) after 5 minutes. When the same combustion pattern 5 continues after 5 minutes, the temporary correction factor H2 is set to 20% and the cumulative correction factor H1 is reduced as described above, and the total correction factor is a sawtooth waveform. It changes with .
[0033]
Further, in FIG. 6, a broken line indicates a case where the combustion pattern 5 changes to the combustion pattern 4 after 6 minutes from the time 0. Since the temporary correction factor H2 is set to 0% with respect to this combustion pattern 4, when the combustion pattern 4 continues, the temporary correction factor H2 is fixed at 0%, while the cumulative correction factor H1 is the combustion factor. Since the gain for the pattern 4 is 0%, the current value of the cumulative correction factor H1 of -6% is maintained as it is, and the correction factor obtained by adding the temporary correction factor H2 and the cumulative correction factor H1 is indicated by a thick broken line in the figure. As shown.
[0034]
Next, the cumulative correction factor H1 obtained as described above is limited by setting an upper limit and a lower limit based on the actual incineration pace (ton / hour). Usually, an incinerator is designed so as to achieve a rated incineration amount for a waste heat generation amount set within a certain range. Therefore, the incineration processing capacity is 100% at the upper and lower limits of the calorific value, and at other times, the processing capacity is about 100 to 120%. Therefore, it is important for maintaining stable combustion that the incineration pace does not deviate significantly from the rated incineration pace. Specifically, as shown in FIG. 7, when the rated ratio (%) of the actual incineration pace (ton / hour) to the target incineration pace (ton / hour) is within an appropriate range (95% to 105%), the cumulative correction factor The upper limit is set to a large value of 20% and the lower limit of the cumulative correction factor is minus 20%. However, if the above ratio exceeds 105%, the lower limit of the cumulative correction factor is not changed and the upper limit of the cumulative correction factor is shifted to the negative side. Conversely, when the ratio is smaller than 95%, the upper limit of the cumulative correction factor is not changed, and the lower limit of the cumulative correction factor is shifted to the plus side.
[0035]
Finally, using the cumulative correction rate H1 (%) and the temporary correction rate H2 (%) obtained as described above, the reference operation speed Vk (cycle / hour) is corrected by the following equation to obtain the actual operation speed Vj. (Cycle / hour) is determined.
[0036]
[Expression 2]
Vj = Vk · [(100 + H1 + H2 ) / 100 ]
[0037]
FIG. 8 shows a control flow of dust supply speed control.
First, the dust supply efficiency is calculated from the actual value of the dust supply speed (the operating speed of the pusher mechanism 4) and the amount of dust input, and the reference dust supply speed Vk is calculated from the dust supply efficiency and the target incineration pace (steps # 1 to # 1). # 2).
Next, a combustion pattern is determined based on the steam generation amount and the fuel cutoff point, the cumulative correction factor H1 is calculated for the combustion pattern, and the upper and lower limit limits are calculated for the calculated cumulative correction factor H1. Processing is executed (steps # 3 to # 5).
On the other hand, the temporary correction rate H2 is calculated for the combustion pattern, the reference dust supply rate Vk is corrected using the temporary correction rate H2 and the cumulative correction rate H1, and the actual dust supply rate Vj is calculated. Control output is performed as an operation amount (steps # 6 to # 8).
[0038]
FIG. 9 shows an example of the control result of the steam generation amount, which is a stable combustion index as a standard deviation of the daily fluctuation (%) of the steam generation amount expressed by the following formula in the continuous operation results for one week. %, A good result of 3% or less (1.5 to 2.8%) was obtained.
[0039]
[Equation 3]
Change in steam generation rate (%) = (| Actual value−Target value | / Target value) · 100
[0040]
[Another embodiment]
In the above embodiment, the control means C sets the actual operation speed Vj of the dust supply means 4 so that the amount of dust supplied to the furnace falls within the appropriate range of the incineration processing capacity of the furnace. Although it is configured to limit based on the incineration pace), as described in Step # 5 of FIG. 8, the dust supply means 4 is based on both the actual value of the incineration amount and the heat generation amount of the dust. The actual operation speed Vj may be limited.
[0041]
Further, in the above-described embodiment, a plurality of combustion patterns are set using two-dimensional matrix information that combines the amount of heat generated in the furnace and the amount of accumulated dust in the furnace as a combustion index indicating the combustion state of garbage in the furnace. However, the combustion index is not limited to this. For example, either the amount of heat generated in the furnace or the amount of accumulated dust in the furnace may be used, or in addition to this, detection information of the gas temperature sensor 25 that detects the exhaust gas temperature at the incinerator outlet, Information detected by the oxygen concentration sensor 26 that detects the oxygen concentration in the exhaust gas after the secondary combustion may be used as the combustion index.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing the overall configuration of a waste incinerator. FIG. 2 is a plan view showing a state where a burnout point of combustion waste in an incinerator is detected. FIG. 3 is a block circuit diagram of a control system. FIG. 5 is a diagram illustrating an example of a combustion pattern. FIG. 5 is a diagram illustrating a set value of the cumulative correction factor and the temporary correction factor. FIG. 6 is a graph illustrating an example of a change in the cumulative correction factor and the temporary correction factor. FIG. 8 is a flow chart of the control. FIG. 9 is a diagram showing an example of the control result of the steam generation amount.
3 Incinerator 4 Dust supply means C Control means

Claims (3)

Based on the target incineration amount of the waste to be incinerated in the furnace and the dust supply efficiency representing the dust supply amount of the dust supply means for supplying the dust into the furnace, the reference operation speed of the dust supply means is obtained, and the reference operation speed is obtained. A combustion control device for an incinerator provided with a control means for controlling the operation of the dust supply means based on,
The actual operating speed of the dust supply means is obtained by correcting the reference operating speed based on a combustion index representing the combustion state of dust in the furnace, and the actual value of the incineration amount or the actual value of the incineration amount In limiting the actual operation speed so that the amount of dust supplied to the furnace is within an appropriate range with respect to the incineration processing capacity of the furnace, based on both the estimated values of the heat generation amount of the garbage, the control means, As the combustion index, a plurality of combustion patterns are set, and when one of the plurality of combustion patterns continues to appear, a cumulative correction factor for accumulating or increasing a correction factor for correcting the reference operation speed is obtained. While limiting the cumulative correction rate by the upper limit value and the lower limit value set based on the actual value of the waste incineration amount or both the actual value of the waste incineration amount and the estimated value of the heat generation amount of the waste, Before using Combustion control device for incinerators that the reference operation speed by correcting seek the actual operation speed. One said control means, when correcting the reference operating speed, in addition to the cumulative correction factor, one of the combustion pattern is temporarily set the correction factor for correcting the reference operation speed when it appears combustion control apparatus for an incinerator of claim 1, wherein using the time correction factor. It said control means as said plurality of combustion patterns, incinerator according to claim 1 or 2, wherein using a two-dimensional matrix information which is a combination of an evaluation index of the waste holdup in metrics and furnace generating heat in the furnace Combustion control device.

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