JP2004245519A - Combustion controller for incinerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion controller for an incinerator capable of avoiding worsening of a combustion condition due to excessive supply and insufficient supply of refuse into the incinerator to realize stable combustion. <P>SOLUTION: Reference operation speed of a refuse supply means 4 is obtained based on target burning amount of refuse burned and handled in the incinerator and refuse supply efficiency showing refuse supply amount of the refuse supply means 4 for supplying refuse into the incinerator. A control means for controlling operation of the refuse supply means 4 based on the reference operation speed obtains actual operation speed of the refuse supply means 4 by compensating the reference operation speed based on a combustion index showing a combustion condition of refuse in the incinerator to limit the actual operation speed so that refuse supply amount into the incinerator is within a proper scope for burning handling capacity of the incinerator based on actual result value of refuse burning amount or both of actual result value of refuse burning amount and inferred value of heat generation amount of refuse. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a combustion control device for an incinerator that incinerates garbage, and in particular, to maintain a target amount of garbage to be incinerated in the furnace and supply the garbage to the furnace in order to maintain the amount of garbage in the furnace within an appropriate range. The reference operation speed of the dust supply means is determined based on the dust supply efficiency indicating the dust supply amount of the dust supply means (for example, one reciprocation of the dust supply apparatus by repeating the reciprocating operation, ie, the amount of dust supply per cycle). The present invention relates to a combustion control device for an incinerator provided with control means for controlling the operation of the dust supply means based on the calculated reference operation speed.
[0002]
[Prior art]
In the first related art related to the combustion control device of the incinerator, the amount of steam generated from the waste heat boiler, the brightness information of the ITV image for monitoring the combustion state in the furnace, the pressure under the post-combustion grate and the pressure in the furnace are obtained. The grate speed, grate stroke length, and post-combustion air damper are controlled based on the pressure difference, post-combustion grate temperature, and main flue temperature to achieve stable steam generation and reduction of unburned refuse. (See Patent Document 1).
[0003]
Further, in the second prior art, the dust supply efficiency (actual dust supply amount per one reciprocation of the dust supply device) is estimated from the operation speed of the dust supply means for supplying dust into the furnace and the history of the dust supply amount. The target dust incineration amount is realized while controlling the dust feeding speed in accordance with the change in the dust quality determined based on the dust feeding efficiency (see Patent Document 2).
[0004]
In the third prior art, the volume of the dust is calculated by measuring the inside of the hopper with a laser distance meter, and the specific gravity of the dust is calculated from the volume of the dust and the weight of the dust separately measured. The calorific value (heat supply amount in the furnace) is estimated, and the dust supply speed is controlled so as to keep the heat supply amount in the furnace constant (see Non-Patent Document 1).
[0005]
[Patent Document 1]
JP-A-10-332121 (pages 2-9, FIGS. 1-12)
[Patent Document 2]
JP-A-7-269834 (pages 2-4, FIGS. 1-4)
[Non-patent document 1]
Shinichi Tsujimoto and 2 others, "Control of waste heat supply in incinerators", Journal of 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 held in the furnace becomes excessive, the speed and stroke length of the grate are controlled to control the dust layer. Although the layer thickness balance can be changed, if the refuse supply speed is the same, the amount of refuse held in the furnace does not decrease, so that there is a problem that unburned refuse is generated. In other words, if the amount of steam generated falls below the target, the garbage feed rate will always increase, and the amount of garbage in the furnace will rapidly increase for garbage with low air permeability, and the air permeability will decrease further, and combustion will decrease. 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 amount of incineration and the dust supply efficiency, and the actual operation speed of the dust supply means is controlled to the reference operation speed. However, if the target waste incineration amount is set high, there is a possibility that waste exceeding the incineration capacity of the furnace may be supplied.
Also, in the third prior art, as in the second prior art, the target incineration amount is set high when the heat generation amount of the dust is low as in the second prior art because of the constant control of the amount of heat supplied. There is a possibility that garbage exceeding the processing capacity may be supplied.
[0008]
The present invention has been made in view of the above circumstances, and an object of the present invention is to avoid a deterioration of a combustion state due to an excessive or insufficient supply of dust to the furnace and to 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 apparatus for an incinerator for achieving the above object expresses a target incineration amount of refuse to be incinerated in the furnace and a refuse supply amount of dust supply means for supplying refuse to the furnace. Control means for obtaining a reference operation speed of the dust supply means based on the dust supply efficiency and controlling the operation of the dust supply means based on the reference operation speed is provided. The control means corrects the reference operation speed based on a combustion index indicating a state of burning dust in the furnace to obtain an actual operating speed of the dust supply means, and obtains an actual value of the dust incineration amount or a dust incineration amount. The actual operation speed is limited so that the amount of dust supplied to the furnace falls within an appropriate range with respect to the incineration capacity of the furnace, based on both the actual value of the heat generation and the estimated value of the calorific value of the dust. .
[0010]
That is, when the shortage of the refuse in the furnace is expected based on the combustion index, the actual operation speed of the dust supply means is increased by correcting the reference operation speed to the increasing side so that the refuse in the furnace is not insufficient. On the other hand, when it is expected that the dust in the furnace is excessive, the reference operation speed is corrected to a lower side so that the dust in the furnace is not excessive, so that the actual operation speed of the dust supply means is reduced.
Further, based on the actual value of the incineration amount or both the actual value of the incineration amount and the estimated value of the calorific value 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 refuse supplied into the furnace does not exceed the upper limit of the appropriate range of the incineration capacity of the furnace. When the actual value of the amount is small, the actual operation speed of the dust supply means is limited to a high speed 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 operation speed is obtained by correcting the reference operation speed of the dust supply means obtained based on the target incineration amount and the dust supply efficiency in accordance with the combustion state of the dust in the furnace. The actual operation speed of the dust supply means is limited based on the actual value of the incineration amount of refuse so that the amount falls within an appropriate range with respect to the incineration capacity of the furnace. Provided is a combustion control apparatus for an incinerator, which is capable of avoiding deterioration of a combustion state due to insufficient supply and realizing stable combustion.
[0012]
A feature configuration of the invention according to claim 2 is the invention according to claim 1, wherein the control means sets a plurality of combustion patterns as the combustion index, and one of the plurality of combustion patterns continuously appears. A cumulative correction rate that increases or decreases accumulatively is calculated, and an upper limit value and a lower limit value set based on 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 dust are used. The point is that the actual operation speed is obtained by correcting the reference operation speed using the accumulated correction ratio while limiting the accumulated correction ratio.
[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 garbage retained in the furnace. For example, the amount of generated steam exceeds the target, and the burn-off point is upstream of the drying zone. When the combustion pattern located at the position (1) continues to appear, it is determined that the heat generation amount of dust increases and the combustion speed is high, and the cumulative correction rate is accumulated and increased, while the amount of generated steam decreases and the combustion rate decreases. When the combustion pattern in which the cut point is located downstream on the post-combustion side continues to appear, it is determined that the heat generation amount of the dust decreases and the combustion speed is low, and the accumulation correction rate is accumulated and decreased so that the accumulation correction rate is decreased. An appropriate actual operating speed can be obtained by reflecting the stable combustion state in the furnace or a gradual change in the combustion state in the correction rate, and the amount of dust supplied is within the appropriate range for the incineration capacity of the furnace. To fit in the rated combustion The upper limit and the lower limit are set for the cumulative correction rate based on the actual value of the amount of refuse incinerated with respect to the amount of waste, so that even if one of the combustion patterns continues, the actual operation speed of the dust supply means is set to the appropriate speed. It does not deviate significantly from
Therefore, it is possible to easily and appropriately determine the actual operation speed from the reference operation speed of the dust supply means by using the two parameters of the plurality of combustion patterns and the cumulative correction rate, which is suitable for the combustion control device of the incinerator. Embodiments are provided.
[0014]
According to a characteristic configuration of the invention according to claim 3, in the invention according to claim 2, when the control unit corrects the reference operation speed, one of the combustion patterns appears in addition to the cumulative correction rate. The point is that a temporary correction factor, whose value is sometimes temporarily set, is used.
[0015]
According to the above configuration, the control unit temporarily sets a value to a temporary correction rate when one of the plurality of combustion patterns appears, and uses both the temporary correction rate and the cumulative correction rate to set the temporary correction rate. The actual operation speed of the dust supply means is obtained by correcting the reference operation speed.
That is, since the temporary correction rate is different from the cumulative correction rate and is set only when one of a plurality of combustion patterns appears once, for example, the steam amount increases and indicates a sudden change to excessive combustion. When a combustion pattern appears and it is necessary to rapidly reduce the dust supply speed, it is not possible to cope with the cumulative correction rate in which the value is cumulatively increased or decreased, but by temporarily setting a large value to the temporary correction rate, In addition, it is possible to reliably limit the actual operating speed of the dust supply means in response to the rapid change in the combustion state.
Therefore, by using the temporary correction rate in addition to the cumulative correction rate, 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 to reduce the A preferred embodiment of the combustion control device is provided.
[0016]
The characteristic configuration of the invention according to claim 4 is that, in the invention according to claim 2 or 3, the control means determines, as the plurality of combustion patterns, an evaluation index of a calorific value generated in the furnace and a garbage accumulation amount in the furnace. The point is that two-dimensional matrix information combined with an evaluation index is used.
[0017]
It is difficult to judge whether or not the combustion state of the refuse in the furnace is proper 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 is poor combustion of the refuse in the furnace. It is not possible to judge whether or not the amount of garbage in the furnace is small, but by combining the amount of heat generated in the furnace with the amount of garbage in the furnace, for example, the amount of garbage in the furnace Nevertheless, when the amount of generated heat is small, it can be determined that dust in the furnace is poorly burned due to a decrease in air permeability or the like.
Therefore, by combining information on the amount of heat generated in the furnace and the amount of garbage retained in the furnace as the plurality of combustion patterns, it is appropriately determined whether or not the garbage in the furnace is in an appropriate combustion state, and It is possible to appropriately set the actual operating 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]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a combustion control device for an incinerator according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, a bucket 1 for picking up and transporting dust accumulated in a dust pit 20, a hopper 2 into which the dust picked up by the bucket 1 is put, and an incinerator 3 for removing dust in the hopper 2. A pusher mechanism 4 serving as dust supply means which reciprocates to push and supply the wastewater into the furnace; a stoker-type incineration zone 5 for incineration while transporting refuse supplied into the furnace by the pusher mechanism 4; An ash pit 6 for collecting incinerated ash from the zone 5, a steam turbine 8 supplied with steam from a waste heat boiler 7 for collecting heat generated in the furnace, and power generation driven by the steam turbine 8. A refuse incineration facility is provided so that the refuse incineration equipment is provided, and after the exhaust gas from the incinerator 3 is treated by an exhaust gas treatment unit 10 having a bag filter or the like, the exhaust gas is discharged from a chimney 11. .
[0019]
Although not shown in the drawings, the steam from the waste heat boiler 7 is stored in a steam reservoir in a state where the steam is heated by a steam heater arranged in a flue for sending exhaust gas from the incinerator 3 to be dried and vaporized, After the steam from the steam reservoir is supplied to the steam turbine 8 to drive the generator 9, the steam is condensed and finally returned to the waste heat boiler 7. In addition, a steam amount sensor 14 for detecting the amount of generated steam is provided in a steam path supplied from the waste heat boiler 7 to the steam turbine 8.
[0020]
The incineration treatment zone 5 includes a drying treatment zone 5a for drying the supplied dust and heating it to near the ignition point from the upper side (the side of the pusher mechanism 4) along the direction of transporting the dust in the furnace. A combustion treatment zone 5b for burning refuse and a post-combustion treatment zone 5c for ashing the burned trash are sequentially arranged. Each of the incineration zones 5a, 5b, and 5c is formed in a step-like manner so that the level of the incineration zone 5 becomes lower toward the lower side in the transport direction. Each of the treatment zones 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 operating a hydraulic cylinder (not shown). The dust is stirred while the dust on the incineration zone is sequentially transferred to the drying zone 5a, the combustion zone 5b, and the post-combustion zone 5c by sliding back and forth with respect to the grate. Then, the ash that has been incinerated in the post-combustion treatment zone 5c falls to the ash pushing mechanism 12 and is conveyed and accumulated in the ash pit 6 by the ash conveyor 13.
[0021]
Below the incineration zone 5, primary combustion air for promoting the combustion of dust is supplied. Specifically, a plurality of flow paths 22 are connected to a plurality of wind boxes 23 disposed below the processing zones 5a, 5b, and 5c, and each of the flow paths 22 is blown by a blower (not shown). The heated air is supplied according to. Then, the air supplied to each flow path 22 passes upward from the wind box 23 through each of the processing zones 5a, 5b, and 5c, so that the combustion of dust is promoted.
[0022]
Secondary combustion air supply means for supplying secondary combustion air to the inside of the furnace above the incineration treatment zone 5 in order to perform secondary combustion of the combustion gas generated by the burning of the refuse in the incinerator 3 27 are 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. A gas temperature sensor 25 of a thermocouple type or the like for measuring the temperature, that is, the furnace outlet temperature is provided.
[0023]
A television camera 15 for detecting the position of the burn-off point of the garbage in the incineration treatment zone 5 is provided on the rear combustion zone-side furnace wall opposite to the position of the pusher mechanism 4 of the incinerator 3. Specifically, as shown in FIG. 2, the television camera 15 sets the combustion processing zone 5b in which the burn-off point mk indicating the gas burning end of the trash in the furnace is set as the imaging range. Then, the image data of the television camera 15 is binarized other than the flame and the flame by the image processing unit provided in the control device 30 (see FIG. 3) described later to extract the combustion flame, and the combustion flame is downstream. The end is determined to be the burning point mk.
[0024]
As shown in FIG. 3, a control device 30 including a microprocessor, a semiconductor memory, and the like is provided, and the control device 30 includes the steam amount sensor 14, the television camera 15, the gas temperature sensor 25, and the oxygen concentration sensor 26. , And each piece of detection information of a weight sensor 24 (see FIG. 1) that detects the weight of dust that is picked up by the bucket 1 and put into the furnace. On the other hand, a drive signal for the bucket 1, the pusher mechanism 4, and the like is output from the control device 30.
[0025]
Dust supply efficiency calculating means D for calculating dust supply efficiency indicating the amount of dust supplied per cycle of the pusher mechanism 4 for supplying dust into the furnace is provided in the control device 30. The dust supply efficiency is estimated from the operation speed of the pusher mechanism 4 and the actual value of the dust input amount. Specifically, assuming a certain amount of garbage 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 for a predetermined time required to input the garbage amount is assumed. The dust input efficiency (tons / cycle) is obtained by dividing the input weight (tons / hour) of dust by the mechanism 4 by the moving average value of the operating speed (cycles / hour) of the pusher mechanism 4 at the same predetermined time. .
[0026]
Further, in the control device 30, based on the target incineration amount of garbage to be incinerated in the furnace (hereinafter referred to as a target incineration pace) and the dust supply efficiency calculated by the dust supply efficiency calculation means D, as in the following equation: Control means C for determining a reference operation speed Vk (cycle / time) of the pusher mechanism 4 and controlling the operation of the pusher mechanism 4 based on the reference operation speed Vk. The coefficient K in the equation is set to a value in the range of, for example, 1.1 to 1.3.
[0027]
(Equation 1)
Vk = K ・ Target incineration pace (ton / hour) / Dust supply efficiency (ton / cycle)
[0028]
Further, the control means C calculates the actual operating speed Vj of the pusher mechanism 4 by correcting the reference operating speed Vk based on a combustion index indicating a state of burning dust in the furnace. Based on the actual value, the actual operation speed Vj is limited so that the amount of dust supplied into the furnace falls within an appropriate range for the incineration capacity of the furnace. This will be described below.
[0029]
A control configuration for limiting the actual operating speed Vj of the pusher mechanism 4 will be described. 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, a cumulative correction rate H1 that increases or decreases cumulatively and a temporary correction rate H2 that is set to a value temporarily when one of the plurality of combustion patterns appears, are obtained. The actual operating speed Vj is obtained by correcting the reference operating speed Vk using the cumulative correcting ratio H1 and the temporary correcting ratio H2 while limiting the cumulative correcting ratio H1 by an upper limit value and a lower limit value set based on the standard operating speed Vj. ing.
[0030]
The control means C, as the plurality of combustion patterns, two-dimensional matrix information combining the evaluation index of the amount of heat generated in the furnace and the evaluation index of the amount of garbage retained in the furnace, such as the amount of steam and the breaking point mk, etc. Used. Specifically, as shown in FIG. 4, the amount of heat generated in the furnace uses the amount of generated steam (steam amount deviation from an appropriate value) detected by the steam amount sensor 14, and the amount of accumulated dust in the furnace is The position information of the burn-off point mk detected by the TV camera 15 (the position from the tip when the length of the combustion treatment zone 5b is 100%, and whether the position is upstream or downstream with respect to the appropriate position. No.). Six combustion patterns 1 to 6 are set. Therefore, the higher the steam amount deviation becomes from the negative side to the positive side, the higher the combustion level becomes, the larger the total amount of generated heat becomes.
[0031]
FIG. 5 shows an example in which the gain (%) of increasing or decreasing the cumulative correction rate H1 and the gain (%) of the temporary correction rate H2 in the control cycle are set for the above six combustion patterns. In FIG. For the combustion patterns of 1 and 2, in order to prevent the amount of dust from being consumed abruptly by the combustion and becoming short of dust, a positive value is set as the gain of the cumulative correction rate H1, and the dust feed amount is set. In order to suppress the amount of steam by rapidly decreasing the value, a large negative value is set as the gain of the temporary correction rate H2.
[0032]
FIG. 6 shows an example in which the cumulative correction rate H1 (%) and the temporary correction rate H2 (%) are obtained for the change from the combustion pattern 4 to the combustion pattern 5. In this example, the temporary correction rate H2 is set to 20% when the combustion pattern changes from 4 to 5 (time 0), and when the same combustion pattern 5 continues, 0% is applied in a 5-minute control cycle. On the other hand, when the same combustion pattern 5 continues, the cumulative correction rate H1 decreases by 5% in the control cycle of 5 minutes. Therefore, the correction rate obtained by adding the temporary correction rate H2 and the cumulative correction rate H1 is thick in FIG. As shown by the solid line, it temporarily increases to 20% at first, and then decreases to -5% (95%) after 5 minutes. When the same combustion pattern 5 continues after 5 minutes, the temporary correction rate H2 is set to 20% and the cumulative correction rate H1 decreases, and the total correction rate becomes a sawtooth waveform, as described above. To change. That is, the temporary correction rate H2 is an average correction gain in each control cycle. Therefore, a step change of -5% may be used.
[0033]
Further, in FIG. 6, the case where the combustion pattern 5 changes to the combustion pattern 4 six minutes after the time 0 is indicated by a broken line. Since the temporary correction rate H2 is set to 0% for this combustion pattern 4, when the combustion pattern 4 continues, the temporary correction rate H2 is fixed at 0%, while the cumulative correction rate H1 is Since the gain for pattern 4 is 0%, the current value of the cumulative correction rate H1 of −6% is held as it is, and the correction rate obtained by adding the temporary correction rate H2 and the cumulative correction rate H1 is indicated by a thick broken line in the drawing. As shown.
[0034]
Next, the cumulative correction rate H1 determined as described above is limited by setting upper and lower limits based on the actual incineration pace (tons / hour). Usually, an incinerator is designed to achieve a rated incineration amount with respect to a garbage heating value set in a certain range. Therefore, it has an incineration treatment capacity of 100% at the upper and lower limits of the calorific value, and has a treatment capacity of about 100 to 120% at other times. Therefore, it is important that the incineration pace does not largely deviate from the rated incineration pace for maintaining stable combustion. Specifically, as shown in FIG. 7, when the rated ratio (%) of the actual incineration pace (tons / hour) to the target incineration pace (tons / hour) is within an appropriate range (95% to 105%), the cumulative correction rate The upper limit is set to a relatively large value of 20%, and the lower limit of the cumulative correction rate is set to a relatively large value of minus 20%. Conversely, when the ratio becomes smaller than 95%, the upper limit of the cumulative correction rate is not changed and the lower limit of the cumulative correction rate 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 / time) is corrected by the following equation to obtain the actual operation speed Vj. (Cycle / time).
[0036]
(Equation 2)
Vj = Vk ・ [(100 + H1) / 100] ・ [(100 + H2) / 100]
[0037]
FIG. 8 shows a control flow of the dust supply speed control.
First, the dust supply efficiency is calculated from the dust supply speed (operating speed of the pusher mechanism 4) and the actual value of the dust input amount, 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, the combustion pattern is determined based on the amount of generated steam and the burn-off point, the cumulative correction rate H1 is calculated for the combustion pattern, and the upper and lower limits are calculated for the calculated cumulative correction rate H1. The processing is executed (steps # 3 to # 5).
On the other hand, the temporary correction rate H2 is calculated for the combustion pattern, and the actual dust supply rate Vj is calculated by correcting the reference dust supply rate Vk using the temporary correction rate H2 and the cumulative correction rate H1. Control output is performed as an operation amount (steps # 6 to # 8).
[0038]
FIG. 9 shows an example of the control result of the amount of steam generation. The result of continuous operation for one week is a standard deviation of the daily variation (%) of the amount of steam generation expressed by the following formula, which is used as a stable combustion index. %, Which is much less than 3% (1.5 to 2.8%).
[0039]
[Equation 3]
Fluctuation of steam generation (%) = (| actual value−target value | / target value) · 100
[0040]
[Another embodiment]
In the above embodiment, the control means C sets the actual operating speed Vj of the dust supply means 4 to the actual value of the dust incineration amount (actual amount) so that the amount of dust supplied into the furnace is within the appropriate range of the incineration capacity of the furnace. However, as described in step # 5 of FIG. 8, the dust supply means 4 is restricted based on both the actual value of the incineration amount and the calorific value of the dust. The actual operation speed Vj may be limited.
[0041]
Further, in the above 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 retained dust in the furnace as a combustion index indicating the state of combustion of the dust in the furnace. However, the combustion index is not limited to this. For example, any one of the amount of heat generated in the furnace and the amount of garbage retained in the furnace may be used, or, in addition to this, detection information of a gas temperature sensor 25 that detects an exhaust gas temperature at an incinerator outlet, The detection information of 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 entire configuration of a refuse incinerator. FIG. 2 is a plan view showing a state where a burn-off point of combustion refuse in an incinerator is detected. FIG. 3 is a block circuit diagram of a control system. FIG. 5 is a diagram showing an example of a combustion pattern. FIG. 5 is a diagram showing set values of a cumulative correction rate and a temporary correction rate. FIG. 6 is a graph showing a change example of set values of a cumulative correction rate and a temporary correction rate. FIG. 8 is a graph showing an example of setting upper and lower limits for the rate. FIG. 8 is a flowchart of control. FIG. 9 is a diagram showing an example of a control result of a steam generation amount.
3 incinerator 4 dust supply means C control means

Claims (4)

The reference operation speed of the dust supply means is obtained based on a target incineration amount of refuse to be incinerated in the furnace and a dust supply efficiency indicating a dust supply amount of the dust supply means for supplying trash into the furnace. An incinerator combustion control device provided with control means for controlling the operation of the dust supply means based on the
The control means corrects the reference operation speed based on a combustion index indicating a state of burning dust in the furnace to obtain an actual operating speed of the dust supply means, and obtains an actual value of the amount of dust incineration or dust incineration. An incinerator for limiting the actual operation speed based on both the actual value of the amount and the estimated value of the amount of heat generated by the refuse so that the amount of refuse supplied to the furnace falls within an appropriate range with respect to the incineration capacity of the furnace. Combustion control device. The control means sets a plurality of combustion patterns as the combustion index, obtains a cumulative correction rate that increases or decreases cumulatively when one of the plurality of combustion patterns continuously appears, and calculates the garbage incineration amount. While limiting the cumulative correction rate by an upper limit and a lower limit set based on an actual value or both an actual value of the incineration amount and an estimated value of the heat generation amount of the dust, the reference operation is performed using the cumulative correction rate. 2. The combustion control device for an incinerator according to claim 1, wherein the actual operation speed is obtained by correcting the speed. 3. The control means, when correcting the reference operation speed, uses a temporary correction rate that is temporarily set when one of the combustion patterns appears, in addition to the cumulative correction rate. 4. Incinerator combustion control device. 4. The incinerator according to claim 2, wherein the control unit uses two-dimensional matrix information obtained by combining an evaluation index of the amount of heat generated in the furnace and an evaluation index of the amount of garbage retained in the furnace as the plurality of combustion patterns. 5. Combustion control device.

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