JP2003161422A - Combustion control method and device of garbage incinerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce an exhaust gas quantity by stably burning garbage by supplying a proper quantity of combustion air in response to a combustion state. <P>SOLUTION: An ignition point 1 and a burn-off point E are determined on the basis of the temperature distribution obtained from imaging data of an infrared imaging device. The oxygen concentration of exhaust gas exhausted from the inside of a furnace body 1 is detected. The total supply air quantity of falling within a prescribed range on the oxygen concentration is determined. A combustion air quantity supplied to a combustion area is determined by subtracting a required air quantity of a dry area and a pre-combustion area from the total supply air quantity. The combustion area is partitioned into a plurality of control blocks with every wind box capable of controlling the combustion air quantity. An average temperature of the respective control blocks is respectively determined from the imaging data. The combustion air quantity supplied to the respective combustion control blocks is proportioned in response to the average temperature of the combustion control blocks. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion control method and apparatus in a stoker type refuse incinerator.

[0002]

2. Description of the Related Art Conventionally, in a stoker-type refuse incinerator,
For example, in Japanese Unexamined Patent Publication No. 8-94055, a burning state of dust is photographed by an image pickup means, a flame region is extracted from this image data, and color separation is performed into RGB, and the intensity ratio of R color and G color for each pixel is determined. The area of the high temperature area is extracted, the total amount of combustion air is adjusted so that the area of the high temperature area and the amount of combustion air to the wind box are inversely proportional, and based on the burnout position obtained from the flame area of the image data. , The one which adjusts the supply ratio of the combustion air amount of the wind box is proposed.

[0003]

However, in the above-mentioned conventional structure, the larger the area of the high temperature region is, the more the combustion is activated and the total amount of the combustion air is reduced in order to prevent the blow-through and the burnout of the grate due to the excess air. On the contrary, the smaller the area of the high temperature region is, the more the total supply amount of the combustion air is increased in order to prevent the combustion from decreasing and the incomplete combustion to occur.

Further, in the combustion zone, the air supply ratio to the wind box separated into the front and rear is supplied in the ratio of the combustion area. Therefore, if the supply amount of combustion air is reduced when the high temperature combustion region is wide, combustion is suppressed, but the combustion becomes unstable reduction combustion, and unburned components such as soot increase and A harmful gas such as carbon oxide gas is easily generated. Further, when the area of the high temperature region is small, when the total supply amount of the combustion air is increased, there is a problem that the temperature inside the furnace is temporarily lowered and uneven combustion easily occurs. In addition, in general, waste incinerators are supplied with more air than the theoretical air volume required because of partial combustion variations, which increases the total emission of exhaust gas and There is a problem in that the burden on the facility becomes large, a large-capacity exhaust gas treatment facility is required, and the amount of treatment chemicals used and the number of maintenances increase.

The present invention solves the above problems and can supply a proper amount of combustion air according to the combustion state to realize stable combustion, and at the same time, can reduce the amount of exhaust gas and control the combustion in a refuse incinerator. And to provide a device.

[0006]

In order to achieve the above object, the combustion control method for a refuse incinerator according to claim 1, wherein the hearth is imaged by an infrared imaging device and the hearth obtained from the imaging data. The ignition point and the burn-out point are determined based on the temperature distribution of the part, the oxygen concentration of the exhaust gas discharged from the furnace is detected, and the total air supply amount in which the oxygen concentration is within a predetermined range is obtained. The required air amount in the dry zone and the required combustion zone are subtracted from the supplied air volume to obtain the combustion air volume to be supplied to the combustion zone, and at least the combustion zone is divided into a plurality of control blocks capable of controlling the combustion air volume. The temperature distribution of each control block is obtained from the imaged data, and the combustion air amount corresponding to the average temperature of the control block is supplied to each control block.

According to the above configuration, the temperature distribution is measured for each control block, and the combustion air amount is supplied according to each average temperature. Therefore, the proper combustion air amount without excess or deficiency is supplied to the control block. You can Therefore, it is possible to perform stable combustion in a state where there is no excess or deficiency in the amount of combustion air, it is possible to prevent the generation of unburned components and harmful gas due to excess and deficiency of combustion air, and to supply no excess combustion air. Therefore, the amount of exhaust gas does not increase. This eliminates the need for a large-capacity exhaust gas treatment facility and reduces the amount of treatment chemicals used and the number of maintenance operations.

According to a second aspect of the present invention, there is provided a combustion control method for a refuse incinerator according to the first aspect, in which the bed height of dust in a dry area is detected.
While keeping the bed height of the dust within a certain range, the transport speed of the dust in the dry region and the amount of the dust supplied to the furnace are controlled so that the ignition point is within the allowable range.

According to the above construction, while keeping the bed height of the dust in the dry region within a certain range, the conveyance speed of the dust and the amount of dust supplied are controlled to keep the ignition point within the allowable range, so that the quality of the dust is reduced. Even if it fluctuates, there is little fluctuation in the ignition point, and it is possible to satisfactorily dry the waste and send it to the combustion zone. In addition, since the ignition point does not change, the combustion area does not increase or decrease, more stable combustion is possible, and since the fluctuation of the ignition point in the control block is small, the amount of combustion air can be easily controlled and more stable combustion can be achieved. It will be possible.

According to a third aspect of the combustion control method for a refuse incinerator, an image of the hearth is imaged by an infrared imaging device, the ignition point is determined based on the temperature distribution obtained from the imaged data, and the dust in the dry area is determined. The bed height of the waste is detected, and while keeping the bed height of the dust within a certain range, the conveyance speed of the dust in the dry region and the amount of the dust supplied to the furnace are controlled so that the ignition point is within the allowable range. To do.

According to the above construction, the ignition point is set within the allowable range by controlling the transport speed of the dust and the amount of the dust supplied into the furnace while keeping the bed height of the dust in the dry region within a certain range. Since it keeps it, even if the quality of the waste fluctuates, the fluctuation in the dry area is small, so that the waste can be dried well and sent to the combustion area.Since the fluctuation of the ignition point is small, the combustion area does not increase or decrease. , More stable combustion becomes possible.

According to a fourth aspect of the present invention, there is provided a combustion control device for a refuse incinerator, which comprises an infrared image pickup device for picking up an image of a hearth, an oxygen concentration detecting means for detecting an oxygen concentration of exhaust gas discharged from the inside of the furnace, and at least the combustion. A plurality of control blocks that are formed by being divided into regions and are capable of controlling the combustion air amount, and control the combustion air amount supplied to the control block based on the imaging data of the infrared imaging device and the detection data of the oxygen concentration detection means. And a combustion controller for determining the ignition point and the burn-out point based on the temperature distribution obtained from the imaged data, and the zone / temperature distribution determination unit for determining the temperature distribution of each control block. , A total air amount calculation unit for obtaining a total supply air amount so that the oxygen concentration is within a predetermined range, and subtracting a required air amount in a dry zone and a required combustion zone from the total air supply amount Determine the amount of combustion air supplied to the combustion zone Te, respectively supplied combustion air quantity to the control block of the combustion zone is in proportion to the average temperature of the control block which is provided a distribution amount calculation unit for allocation.

According to the above construction, the band / temperature distribution determining unit obtains the ignition point, the burn-out point and the temperature distribution based on the image data of the infrared image pickup device, and further the total air amount calculating unit calculates the oxygen concentration of the exhaust gas. The total air supply amount is calculated, and the distribution air amount calculation unit calculates and supplies the combustion air amount proportional to the average temperature for each control block from the total air supply amount, and supplies the proper combustion air amount without excess or deficiency. Can be supplied for each control block. Therefore, the waste can be stably burned, and the generation of unburned components and harmful gas due to excess and deficiency of combustion air can be prevented. Moreover, since it is not necessary to supply an extra combustion air, the amount of exhaust gas does not increase. This eliminates the need for a large-capacity exhaust gas treatment facility and reduces the amount of treatment chemicals used and the number of maintenance operations.

According to a fifth aspect of the present invention, in the combustion control device for a refuse incinerator according to the fourth aspect, the bed height detecting means for detecting the bed height of the dust in the dry area and the image data of the infrared imaging device are included. A combustion controller that controls the ignition point position based on the detection data of the bed height detection means, and the combustion controller determines the ignition point at the boundary between the dry zone and the combustion zone based on the temperature distribution obtained from the imaging data. By keeping the bed height of the dust in the dry area within a certain range by the band determination unit and the detection data of the bed height detecting means, the dust conveyance speed and the dust supply amount in the dry area are controlled to keep the ignition point within the allowable range. And an ignition point control unit for controlling the ignition point.

According to the above construction, while keeping the height of the dust layer within a certain range, the dust conveyance speed and the dust supply amount are controlled by the ignition point control unit to keep the ignition point within the allowable range. Fluctuates in the ignition point, the dust can be dried well and can be sent to the combustion zone. Also, since the fluctuation of the ignition point is small, the combustion area does not increase or decrease, and more stable combustion is possible.Furthermore, since the fluctuation of the ignition point is small, the control of the combustion air amount in the control block can be easily performed, and a more stable combustion is achieved. Is possible.

A combustion control device for a refuse incinerator according to claim 6 is provided with an infrared imaging device for imaging the hearth and a bed height detecting means for detecting the bed height of the dust in the dry region. Based on the imaging data of and the detection data of the bed height detection means, the band determination unit that determines the ignition point position, and the detection data of the bed height detection means, while keeping the bed height of the dust in the dry area within a certain range, A combustion controller is provided, which has an ignition point control unit that controls the dust transfer speed and the dust supply amount to maintain the ignition point within an allowable range.

According to the above configuration, the ignition point control section
While keeping the bed height of the dust within a certain range based on the detection data of the bed height detection means, the garbage conveyance speed and the amount of supplied dust are controlled to keep the ignition point within the allowable range, so the dust quality fluctuates. However, the fluctuation of the ignition point can be reduced, and the waste can be dried well and sent into the combustion zone. Further, since the ignition point does not change, stable combustion is possible with little influence on the combustion region.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Here, an embodiment of a combustion control device for a stoker type refuse incinerator according to the present invention will be described with reference to FIGS.

As shown in FIG. 1, the dust supply port 2 is provided on one end side.
Is formed and the ash discharge port 3 is formed on the other end of the furnace body 1 at the bottom of the furnace grate device for conveying the combusted dust while stirring and dry-burning it with air from below. The floor) 4 is arranged. A waste pusher device (dust supply device) 6 for supplying a predetermined amount of the waste in the waste hopper 5 into the furnace main body 1 is arranged at the waste supply port 2, and the waste pusher device 6 is provided with a pusher block rather than a pusher cylinder. A pusher operating portion 6a for operating a switching valve for supplying / discharging driving fluid to / from a pusher cylinder is provided so as to supply a fixed amount of dust in the dust hopper 5 by intermittently moving back and forth.

In the furnace body 1, a dry zone 11, a combustion zone 12 and an alternate combustion zone 13 are formed on the grate device 4 downstream from the upstream dust supply port 2 to incinerate the dust, Ash and incineration residue are discharged from the ash discharge port 3. The grate device 4 includes a grate floor in which fixed grate and movable grate are alternately arranged in the width direction from the upstream side to the downstream side, and the movable grate is fed by the transport drive unit 4a. After being reciprocally moved in the direction, the refuse and incineration residue are sequentially sent from the dry zone 11 to the combustion zone 12 and then the combustion zone 13. In the lower part of the grate floor, wind boxes 7A to 7H that are divided into a plurality of pieces (8 divisions in the figure) in the garbage feeding direction are arranged,
Total air supply device (main blower) 8 to main duct 9
The air supplied to the air ducts 7A to 7H from the branch ducts via the flow rate adjusting devices (for example, dampers) 10A to 10H.
And is supplied to the dry zone 11, the combustion zone 12, and the vertical combustion zone 13 in the furnace body 1 through the grate floor. There is a dry zone 11 on the top wall of the dry zone 11 of the furnace body 1.
A bed height sensor 21 which is a bed height detecting means for detecting the height of dust is provided, for example, a laser level sensor.
Further, an infrared camera (infrared imaging device) 22 for picking up an image of the grate device 4 from an obliquely upper position is arranged on the top wall of the furnace body 1.
It is equipped with a filter that passes near-infrared rays having a wavelength of only μm, and is configured to remove infrared rays emitted from the flame and measure the surface temperature of the dust layer. Also the furnace body 1
Exhaust gas discharged from the exhaust gas passage 2 above the furnace body 1
Heat recovery device 24 for recovering waste heat from 3 and exhaust gas treatment device 2 for controlling the temperature of exhaust gas and removing harmful substances and dust
5 is discharged through the exhaust gas treatment device 25, for example.
An oxygen concentration detection sensor (oxygen concentration detection means) 26 for detecting the oxygen concentration of exhaust gas is arranged at the outlet of the filter type dust collector (bag filter).

A combustion controller 30 is provided for controlling combustion on the basis of the image data of the infrared camera 22, the oxygen concentration detection sensor 26 and the bed height sensor 21, and the combustion controller 23 includes a combustion zone 1
The air amount control of 2 and the ignition point control of the dry zone 11 are performed.

The combustion controller 30 is provided with an image processing section 31 which performs a pre-processing for processing the image data of the infrared camera 22 into temperature distribution data of higher color as shown in FIG. In addition, this image processing unit 31
Is processed into temperature distribution data, and the ignition point I and the burn-out point E shown in FIG. 3 are determined to specify the ranges of the dry zone 11, the combustion zone 12, and the interburn zone 13.
A band determination unit 32 is provided. In the temperature distribution / band determination unit 32, as shown in FIG. 4A, the crossing line IL that is the ignition point I is crossed within an area that is equal to or larger than the temperature line Tb (threshold value) when viewed from the dust supply port 2. Then, the transverse line IL is arranged so that the area Am1 surrounded by the transverse line IL and the temperature line Tb becomes the predetermined threshold Ad, and the ignition point I is determined by this. In addition, as shown in FIG.
As seen from the above, the transverse line EL that becomes the burn-out point E is crossed within the area equal to or larger than the temperature line Ta (threshold value) so that the area Am2 and the threshold value Aa surrounded by the transverse line EL and the temperature line Ta become the threshold value Aa. A transverse line IL is placed, which determines the burn-out point E.

Further, the combustion controller 30 is provided with a total air amount calculation unit 33 for obtaining the total air supply amount based on the detection data of the oxygen concentration detection sensor 26. The total air amount calculation unit 33 obtains a necessary total air supply amount according to the amount of injected dust, the combustion speed, and the quality of the dust so that the oxygen concentration of the exhaust gas becomes a constant level (within a predetermined range).

Based on the total air supply amount data obtained by the total air amount calculation unit 33, the total air supply control unit 3
A control signal is output from 4 to the total air supply device 8, and the required air is supplied to the dry zone 11, the combustion zone 12, and the alternate combustion zone 13.

Further, the grate floor of the grate device 4 is divided into eight control blocks 20A to 20H corresponding to the wind boxes 7A to 7H whose air supply amount can be adjusted independently. , The amount of air required for each zone, and the control blocks 20A, 20B of the dry zone 11
A distributed air amount calculation unit 35 for determining the amount of air supplied to the control blocks 20C to 20F of the combustion region 12 and the control blocks 20G and 20H of the alternate combustion region 13 is provided.
The distributed air amount calculation unit 35 subtracts the air amount required for the dry zone 11 and the combustion zone 13 from the data of the total air supply amount to obtain the combustion air amount to be supplied to the combustion zone 12. Then, the average temperature of the control blocks 20C to 20F corresponding to the combustion zone 12 is read from the data of the zone / temperature distribution determination unit 32, and the average temperature of the control blocks 20C to 20F,
Control block 2 with a high average temperature based on the amount of combustion air
The amount of air to be distributed to each of the control blocks 20C to 20F is obtained by an arithmetic expression proportional to the temperature average value so that a large amount of combustion air is distributed to 0C to 20F and oxygen deficiency does not occur.

For example, the control blocks 20C, 20D, 2
Table 1 shows distribution ratios when the temperature average values Tc, Td, Te, and Tf of 0E and 20F are set and the total combustion air amount is set to 10.

[0027]

[Table 1] Here, although the distribution amount is determined by the magnitude of the average temperature in the control blocks 20C to 20F, the air distribution ratio can be calculated in consideration of the ratio of the temperature difference of the temperature average value.

The air amounts in the dry zone 11 and the alternate combustion zone 13 are distributed in the same manner as in the combustion zone 12 in consideration of the ratio of the average temperature value or the temperature difference. It

Further, the combustion controller 30 is provided with an ignition point control section 37 for controlling the position of the ignition point I. This ignition point control unit 37 keeps the dust layer height in the dry zone 11 constant while keeping the ignition point I determined from the temperature distribution in the temperature distribution / band determination unit 32 within a certain allowable range. Based on the detection data of the high detection sensor 21 and the position data of the ignition point I of the temperature distribution / band determination unit 32,
PID control is performed on the transport drive unit 4a of the grate device 4 which is a waste transport device via the dust transport control unit 38 and the pusher drive unit 4c via the dust supply control unit 39.

Further, it is desirable that the position of the ignition point I is set within an allowable range with the boundary position between the drying control block 20B and the control block 20C as the center. This is the same for the burn-out point E, but if the ignition point I is at the intermediate position of the control block, that is, the air box, the drying air in the drying area 11 and the combustion air in the combustion area 12 are mixed to obtain the air amount. This is because it needs to be calculated. If control block 2
Ignition point I or burnout point E at an intermediate position of 0A to 20G
When there is, the side of the dry area and the combustion area, or the larger area of the combustion area and the combustion area may belong to the area, or the drying air and the combustion air corresponding to the area ratio, The combustion air and the pre-combustion air may be mixed and supplied. In particular, by setting the control block having the burn-out point E in the combustion region 12, it is possible to prevent the unburned matter from remaining because the amount of supplied air increases.

According to the above embodiment, the ignition point control unit 3
7, based on the detection data of the bed height detection sensor 21 and the position data of the ignition point I of the temperature distribution / band determination unit 32,
PID control is performed on the dust transport speed by the transport drive unit 4a and the dust supply amount by the pusher drive unit 4c, and the dry area 1
Since the ignition point I is kept within a certain allowable range while keeping the bed height of No. 1 refuse constant, even if the refuse quality changes, the dry zone 11 can be kept within a certain range and the combustion zone 12 is affected. And stable drying and burning are possible. Further, by keeping the ignition point I near the boundary line of the control block, the air supply amount in the control block can be easily set, and more stable drying and combustion can be performed.

Further, according to the temperature distribution obtained from the image taken by the infrared camera 22, the control block 2 for the combustion zone 12
The temperature average value for each 0C to 20F is calculated, and the higher the temperature average value is supplied by the distribution air amount calculation unit 35, the more combustion air is supplied. Therefore, sufficient air should be supplied to the high temperature portion where the combustion air is required. And stable combustion is possible.
Therefore, unlike in the past, there is no shortage of air in the high-temperature portion to generate unburned matter such as soot or harmful gas,
Combustion can be continued stably.

Furthermore, in the combustion zone 13 as well,
By controlling the air supply amount in each control block, more stable combustion can be performed. In the above embodiment, the control block is formed by partitioning the zone along the direction of the refuse feed, but in a large refuse incinerator, in addition to that, as shown in FIG. To form control block sequences 20α to 20δ, and control blocks 20C to 20F to control block sequences 20α to 20δ.
It is also possible to independently control the amount of air to each block divided by.

Further, the combustion control by adjusting the distribution of the air amount in the control block is carried out when the thickness of the dust layer on the grate exceeds a certain value in order to prevent the burnout of the grate and the occurrence of clinker.

In this case, the bed height sensor 21 shown in FIG.
Using a bed height sensor installed separately, a bed height detection device that estimates the bed height by detecting the ventilation resistance from the bottom of the grate, and the combustion area and other combustion areas are also measured for bed height. The bed height detection data in the combustion region and the alternate combustion region is input to the distributed air amount computing device 35. Based on these bed height detection data, the amount of combustion air supplied to the grate (wind box) with a low bed height
If the set value is large or equal compared to the control air amount based on the air distribution ratio determined from the average value of the temperature distribution, with the air supply amount divided by the number of all air boxes as the average amount or a set value less than the average value. The control air amount based on the air distribution ratio is adopted as the above, and when the control air amount is small, the difference is averaged to other wind boxes. As a result, each process of proper drying, combustion, and vertical combustion in each region can be completed, and the amount of exhaust gas can be reduced and the complete combustion of dust can be realized.

The total amount of air distributed to each of the dry zone 11, the combustion zone 12, and the alternate combustion zone 13 is from 11 to 11.
Wind box A ₁ which constitutes a 13, A _2, A ₃ each · · A _m may be distributed further as follows. For example, the average temperature on the grate on those wind boxes is calculated as the above-mentioned wind boxes A ₁ , A ₂ , A ₃ ...
T ₁ , T ₂ , T ₃ ··· T _m corresponding to A _m , and the amount of air distributed to each wind box is controlled by the following formula.

Amount of distributed air in the air box A _{n in} each region = (total amount of air distributed in the (dry) region) × α / T _n where n = 1, 2 ·· m coefficient α is α × (1 / T ₁ + 1 / T ₂ + 1 / T ₃ + ... 1
/ T _m ) = 1 As a result, the higher the average temperature T is compared with the average temperature in the grate on the other wind box, the higher the distribution air amount, and the lower the average temperature T, the larger the distribution air amount. It will be.

By adjusting the amount of distributed air in the drying zone 11, the uniformity of drying is improved,
The uniformity of combustion in the alternating combustion region is improved. Combustion area 1
By adjusting the distribution air amount in 2 above, the uniformity of combustion is improved, the uniformity of combustion in the alternate combustion region is improved, and the amount of exhaust gas can be reduced. Further, by adjusting the above-mentioned distributed air amount in the upstream combustion 13, the uniformity of the upstream combustion is improved. Of course, each area 11-1
Distribution of total air volume in 3 or 2 in all or 11
It can also be done in 3.

Further, the distribution of the total air amount in each of the above regions 11 to 13 is carried out when the dust layer thickness on the grate exceeds a certain value, but it is carried out regardless of the dust layer thickness on the grate. You can also

[0040]

As described above, according to the invention of claim 1, the temperature distribution is measured for each control block and the combustion air amount is supplied according to each average temperature, so that there is no excess or deficiency. A large amount of combustion air can be supplied to the control block. Therefore, it is possible to perform stable combustion in a state where there is no excess or deficiency in the amount of combustion air, it is possible to prevent the generation of unburned components and harmful gas due to excess and deficiency of combustion air, and to supply no excess combustion air. Therefore, the amount of exhaust gas does not increase. This eliminates the need for a large-capacity exhaust gas treatment facility and reduces the amount of treatment chemicals used and the number of maintenance operations.

According to the second aspect of the present invention, while keeping the bed height of the dust in the dry region within a certain range, the conveyance speed of the dust and the amount of supplied dust are controlled to keep the ignition point within the allowable range. Even if the quality of the waste fluctuates, the ignition point does not fluctuate so that the waste can be dried well and sent to the combustion zone. In addition, since the ignition point does not change, the combustion area does not increase or decrease, more stable combustion is possible, and since the fluctuation of the ignition point in the control block is small, the amount of combustion air can be easily controlled and more stable combustion can be achieved. It will be possible.

According to the third aspect of the present invention, while keeping the layer height of the dust in the dry region within a certain range, the transport speed of the dust and
By controlling the amount of dust supplied to the furnace, the ignition point is maintained within the allowable range, so even if the dust quality changes, the change in the drying area is small, and this allows the waste to be dried well,
Since it can be sent to the combustion area and the fluctuation of the ignition point is small, the combustion area does not increase or decrease, so that more stable combustion becomes possible.

According to the fourth aspect of the present invention, the band / temperature distribution determination unit obtains the ignition point, the burn-out point and the temperature distribution based on the image data of the infrared image pickup device, and the total air amount calculation unit further calculates the exhaust gas. The total air supply amount is calculated from the oxygen concentration of the above, and the distribution air amount calculation unit calculates and supplies the combustion air amount proportional to the average temperature for each control block from this total air supply amount, so that there is no excess or deficiency of the proper combustion air. The quantity can be supplied per control block in the combustion zone. Therefore, the waste can be stably burned, and the generation of unburned components and harmful gas due to excess and deficiency of combustion air can be prevented. Moreover, since it is not necessary to supply extra combustion air,
The amount of exhaust gas does not increase. This eliminates the need for a large-capacity exhaust gas treatment facility and reduces the amount of treatment chemicals used and the number of maintenance operations.

According to the fifth aspect of the present invention, while keeping the dust layer height within a certain range, the dust conveyance speed and the dust supply amount are controlled by the ignition point control unit to keep the ignition point within the allowable range. Therefore, even if the quality of the dust fluctuates, the fluctuation of the ignition point is small, and it is possible to satisfactorily dry the dust and send it to the combustion zone. Also, since the fluctuation of the ignition point is small, the combustion area does not increase or decrease, and more stable combustion is possible.Furthermore, since the fluctuation of the ignition point is small, the control of the combustion air amount in the control block can be easily performed, and a more stable combustion is achieved. Is possible.

According to the sixth aspect of the present invention, the ignition point control unit maintains the bed height of the dust within a certain range based on the detection data of the bed height detecting means, and at the same time, the dust conveyance speed and the dust supply amount. By controlling and keeping the ignition point within the allowable range,
Even if the quality of the waste fluctuates, the fluctuation of the ignition point can be reduced, and the waste can be dried well and sent to the combustion zone. Further, since the ignition point does not change, stable combustion is possible with little influence on the combustion region.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a refuse incinerator according to the present invention.

FIG. 2 is an image diagram showing a temperature distribution in a furnace by the infrared imaging device.

FIG. 3 is an image diagram showing the dry zone, the combustion zone, and the alternate combustion zone.

FIG. 4A is an explanatory diagram for determining an ignition point,
(B) is an explanatory view for determining a burn-out point.

FIG. 5 is an image diagram showing a control block for the same control.

FIG. 6 is an image diagram showing another embodiment of the control block.

[Explanation of symbols]

I ignition point E burn-out point 1 furnace body 2 garbage supply port 3 Ash outlet 4 grate device 4a grate floor 4b Transport drive unit 6 Garbage pusher device 7A-7H Wind box 8 Total air supply device 9 Main duct 10A to 10H Flow rate adjusting device 11 dry areas 12 Burning area 13 every combustion area 20A to 20H control block 21-layer height sensor 22 infrared camera 23 Exhaust gas passage 24 heat recovery device 25 Exhaust gas treatment equipment 26 Oxygen concentration detection sensor 30 Combustion controller 31 Image processing unit 32 Temperature distribution / band determination unit 33 Total air amount calculator 34 Total Air Supply Control Section 35 Distribution air amount calculation unit 36 Air conditioner control unit 37 Ignition point control unit 38 Garbage transfer control unit 39 Garbage supply control unit

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) F23G 5/50 F23G 5/50 Q (72) Inventor Hideki Endo 1-789, Minamikokita, Suminoe-ku, Osaka City, Osaka Prefecture Hitachi Zosen Co., Ltd. F term (reference) 3K062 AA04 AB01 AC01 BA02 CA03 CA05 CA08 CB03 CB08 DA03 DA22 DA38 DA40

Claims (6)

[Claims] 1. A furnace floor is imaged by an infrared imaging device, an ignition point and a burn-out point are determined based on the temperature distribution of the hearth obtained from the imaged data, and exhaust gas discharged from the furnace is detected. Combustion supplied to the combustion region by detecting the oxygen concentration and determining the total supply air amount within which the oxygen concentration is within a predetermined range, and subtracting the required air amounts in the dry zone and the combustion zone from the total supply air volume. Obtaining the air amount, dividing at least the combustion region into a plurality of control blocks capable of controlling the combustion air amount, obtaining the temperature distribution of each control block from the imaging data, respectively, combustion corresponding to the average temperature of the control block A method for controlling combustion in a refuse incinerator, characterized in that an air amount is supplied to each control block. 2. The conveyance speed of the dust in the dry area and the inside of the furnace so that the bed height of the dust in the dry area is detected, and the ignition point is within an allowable range while keeping the bed height of the dust in a certain range. The method for controlling combustion in a refuse incinerator according to claim 1, wherein the amount of refuse supplied to the waste incinerator is controlled. 3. The hearth is imaged by an infrared imaging device, the ignition point is determined based on the temperature distribution obtained from the imaged data, the bed height of the dust in the dry area is detected, and the bed height of the dust is detected. Combustion control of a refuse incinerator, characterized by controlling the conveying speed of the dust in the dry region and the amount of the dust supplied to the furnace so that the ignition point is within an allowable range while maintaining Method. 4. An infrared image pickup device for picking up an image of the hearth floor, an oxygen concentration detecting means for detecting the oxygen concentration of exhaust gas discharged from the inside of the furnace; A plurality of controllable control blocks; and a combustion controller that controls the amount of combustion air supplied to the control block based on the imaged data of the infrared imaging device and the detection data of the oxygen concentration detection means. , A zone / temperature distribution determination unit that determines the ignition point and the burn-out point based on the temperature distribution obtained from the imaged data and determines the temperature distribution of each control block, and the total supply air with an oxygen concentration within a predetermined range. A total air amount calculation unit for obtaining the amount, the combustion air amount to be supplied to the combustion region by subtracting the required air amount in the dry zone and the combustion zone from the total supply air amount, A combustion control device for a refuse incinerator, comprising: a distribution air amount calculation unit that distributes the amount of combustion air supplied to each control block in the combustion region in proportion to the average temperature of the control block. 5. A bed height detection means for detecting the bed height of the dust in the dry area is provided, and the combustion controller holds the bed height of the dust in the dry area within a certain range based on the detection data of the bed height detection means. 5. The combustion control device for a refuse incinerator according to claim 4, further comprising: an ignition point control unit that controls the refuse transport speed and the dust supply amount in the dry region to maintain the ignition point within an allowable range. 6. An infrared imaging device for imaging the hearth and a bed height detecting means for detecting the bed height of dust in a dry area are provided, and the imaging data of the infrared imaging device and the detection data of the bed height detecting means are provided. Based on the band determination unit for determining the ignition point position, the bed height of the dry area is controlled by the detection data of the bed height detecting means while controlling the dust transport speed and the dust supply amount in the dry zone. A combustion controller for a refuse incinerator, comprising: a combustion controller having an ignition point control unit that maintains the ignition point within an allowable range.