CN115143474A

CN115143474A - Combustion furnace and control method thereof

Info

Publication number: CN115143474A
Application number: CN202210278571.6A
Authority: CN
Inventors: 横井智记; 高桥知大; 草加浩都; 大丸卓一郎; 今田润司; 濑户口稔彦; 岩下信治; 太田裕二
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 2021-03-29
Filing date: 2022-03-21
Publication date: 2022-10-04
Also published as: JP7127179B1; JP2022152687A

Abstract

The invention properly controls the combustion state of the combustion object according to the distribution state of the unburned combustion object transferred by the fire grate in the transfer direction. The invention provides a grate-type incinerator (100), comprising: an incinerator body (10); a waste supply unit (20) that supplies waste (200) to the incinerator body; a grate (30) for transferring the waste supplied from the waste supply unit to the incinerator body in a Transfer Direction (TD); a primary air supply unit (40) and a secondary air supply unit (50) for supplying combustion air to the incinerator body; a distribution state detection sensor (60) for detecting the distribution state of the unburned waste conveyed by the grate in the conveying direction; and a control unit (70) that controls the primary air supply unit and the secondary air supply unit based on the detected distribution state so as to supply more combustion air than the other area to a first predetermined area where more unburned waste exists in the transfer direction than the other area.

Description

Combustion furnace and control method thereof

Technical Field

The present disclosure relates to a combustion furnace and a control method of the combustion furnace.

Background

As an incinerator for incinerating a material to be burned such as waste, a grate-type incinerator can be used. The grate-type incinerator is provided with a grate (grate) in which fixed sections and movable sections are alternately arranged, and drying and combustion are performed while agitating and transferring a material to be combusted, which is fed from a hopper, on the grate by reciprocating the movable sections by a hydraulic device. The dried and burned material becomes ash and is discharged from the incinerator.

In such a grate-type incinerator, it is important to grasp the state of the material to be burned or ash on the grate in order to improve the combustion efficiency. In a grate-type incinerator, for example, patent document 1 is known as a method of grasping the state of a material to be burned or the like on a grate. Patent document 1 discloses the following: the position of the burnout point, which is the boundary between the combustion region where the material to be burned is burned and the ash, and the height of the stacked layers of the material to be burned or the ash are derived, and the supply amount of the material to be burned or the transfer speed of the material to be burned are adjusted.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2018-155411

Disclosure of Invention

Problems to be solved by the invention

When a material to be burned such as waste is supplied to the grate, the distribution of the unburned material to be burned transferred by the grate in the transfer direction fluctuates according to the temporal change in the transfer speed of the feeder that supplies the material to be burned, the properties of the moisture contained in the material to be burned, and the like. For example, when a large amount of the combustion target is temporarily supplied to the grate, the combustion target guided to the grate is pushed out to the downstream side in the transfer direction, and a region where more combustion target is present than other regions is generated. In this case, sufficient combustion air may not be supplied to the region where the object to be combusted is present more than in the other region, and the object to be combusted may not be completely combusted.

However, patent document 1 controls the supply amount of the combustion target based on the local state such as the position of the burnout point and the stacking height of the combustion target or ash, and cannot appropriately control the combustion state of the combustion target in accordance with the distribution state in the transfer direction of the unburned combustion target transferred by the grate.

For example, when the amount of supply of the combustion target to the grate varies with time, the combustion state in the transfer direction of the combustion target also varies with time in accordance with the variation, but the combustion state of the combustion target cannot be controlled in accordance with the variation.

The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a combustion furnace and a control method for the combustion furnace, which are capable of appropriately controlling a combustion state of an unburned object to be combusted, which is transferred by a transfer unit, according to a distribution state in a transfer direction of the object.

Technical scheme

In order to solve the above problem, the present disclosure adopts the following scheme.

A combustion furnace according to one aspect of the present disclosure is a combustion furnace for burning a combustion target while transferring the combustion target along a transfer direction, the combustion furnace including: a combustion furnace main body that burns the combustion target; a combustion object supply unit configured to supply the combustion object to the combustion furnace main body; a transfer unit that is provided in the burner main body and transfers the combustion target supplied from the combustion target supply unit to the burner main body in the transfer direction; an air supply unit for supplying combustion air to the combustion furnace main body; a detection unit that detects a distribution state of the unburned objects to be burned transferred by the transfer unit in the transfer direction; and a control unit configured to control the air supply unit so as to supply more combustion air than the other region to a first predetermined region in which the object to be combusted is not combusted more than the other region in the transfer direction, based on the distribution state detected by the detection unit.

A method of controlling a combustion furnace according to an aspect of the present disclosure is a method of controlling a combustion furnace that combusts a combustion target while transferring the combustion target along a transfer direction, the combustion furnace including: a combustion furnace main body that burns the combustion target; a combustion object supply unit configured to supply the combustion object to the combustion furnace main body; a transfer unit that is provided in the burner main body and transfers the combustion target supplied from the combustion target supply unit to the burner main body in the transfer direction; and an air supply unit configured to supply combustion air to the combustion furnace main body, the method for controlling the combustion furnace including: a detection process of detecting a distribution state in the transfer direction of the unburned object to be burned transferred by the transfer portion; and a control step of controlling the air supply unit so as to supply more combustion air than the other region to a first predetermined region in which the object to be combusted is not combusted more than the other region in the transfer direction, based on the distribution state detected by the detection step.

Advantageous effects

According to the present disclosure, it is possible to provide a combustion furnace and a combustion furnace control method capable of appropriately controlling the combustion state of an object to be combusted based on the distribution state in the transfer direction of an unburned object to be combusted transferred by a transfer portion.

Drawings

Fig. 1 is a schematic sectional view showing a grate-type incinerator according to an embodiment of the present disclosure.

Fig. 2 is a cross-sectional view of the grate-type incinerator shown in fig. 1 at a position where a secondary air supply unit is disposed.

Fig. 3 is a view showing an example of the distribution state of the waste detected by the image processing unit and the image captured by the camera.

Fig. 4 is a view showing an example of the distribution state of the waste detected by the image processing unit and the image captured by the camera.

Fig. 5 is a flowchart illustrating a method of controlling the grate-type incinerator according to an embodiment of the present disclosure.

Detailed Description

Hereinafter, a grate-type incinerator (combustion furnace) 100 according to an embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a schematic sectional view showing a grate-type incinerator 100 according to an embodiment of the present disclosure. Fig. 2 is a cross-sectional view of the grate-type incinerator shown in fig. 1 at a position where a secondary air supply unit is disposed.

The grate-type incinerator 100 will be described below as an example of a combustion furnace for burning the waste 200, but other combustion furnaces may be used instead of the grate-type incinerator 100. Other combustion furnaces are, for example, pulverized coal boilers, kilns, etc.

The grate-type incinerator 100 of the present embodiment is an apparatus that burns waste 200 as a combustion target while transferring the waste 200 in a transfer direction TD. As shown in fig. 1, the grate-type incinerator 100 includes an incinerator body (incinerator body) 10, a waste supply unit (burnt material supply unit) 20, a grate (transfer unit) 30, a primary air supply unit (air supply unit) 40, a secondary air supply unit (air supply unit) 50, a distribution state detection sensor (detection unit) 60, a control unit 70, a heat recovery boiler 80, a cooling tower 85, a dust collecting device 90, and a chimney 95. Here, the waste 200 is solid waste, for example, household waste including solid waste made of paper, plastic, or the like.

The incinerator body 10 is a device for burning the waste 200 transferred by the grate 30. The incinerator body 10 forms a combustion space for burning the waste 200 by a furnace wall disposed so as to surround the waste 200 transferred by the grate 30.

The waste supply unit (burned material supply unit) 20 supplies the waste 200 to the incinerator body 10. The waste supply unit 20 includes: a charging hopper 21 for receiving the waste 200; and a feeder 22 for supplying the waste 200 fed to the feeding hopper 21 to the incinerator body 10. As the feeder 22, for example, a push-type feeder 22 may be used. The push-type feeder 22 is a device that repeats an operation of pushing the waste 200 into the incinerator body 10 by a pushing member (not shown) and an operation of separating the pushing member from the incinerator body 10.

The grate 30 is a device that is provided in the incinerator main body 10 and transports the waste 200 supplied from the waste supply unit 20 to the incinerator main body 10 along the transport direction TD. The grate 30 has a metal grate (not shown) that dries and burns the waste 200 while mixing and stirring the waste 200 and transferring the waste 200 in the transfer direction TD. The grate is formed by alternately arranging a fixed stage (not shown) and a movable stage (not shown), and the waste 200 is transferred by reciprocating the movable stage by a hydraulic device (not shown).

The primary air supply unit 40 supplies combustion air to the incinerator body 10. The primary air supply unit 40 includes a plurality of primary

air supply ports

41a, 41b, 41c, 41d, and 41e, a plurality of

dampers

42a, 42b, 42c, 42d, and 42e, and a blower 43. The plurality of primary

air supply ports

41a, 41b, 41c, 41d, and 41e are arranged with an interval from the upstream side to the downstream side along the transfer direction TD.

The

dampers

42a, 42b, 42c, 42d, and 42e respectively adjust the amount of primary air supplied from the blower 43 to the primary

air supply ports

41a, 41b, 41c, 41d, and 41 e. The opening degrees of the

dampers

42a, 42b, 42c, 42d, and 42e are controlled by control signals sent from the control unit 70.

The blower 43 is configured to blow air in the atmosphere, but may be configured in another manner. For example, the blower 43 may be fed with air whose temperature has been adjusted by an air preheater (not shown), combustion gas generated in the incinerator body 10, oxygen-rich gas, or a mixture thereof.

The secondary air supply unit 50 is a device for supplying combustion air to the incinerator body 10. The secondary air supply portion 50 has a plurality of upstream air supply ports 51, a plurality of downstream air supply ports 52, a plurality of dampers 53, a plurality of dampers 54, and a blower 55.

The blower 55 is air to be blown into the atmosphere, but may be other embodiments. For example, the blower 55 may be fed with air whose temperature has been adjusted by an air preheater (not shown), combustion gas generated in the incinerator body 10, combustion gas discharged from the dust collector 90, oxygen-rich gas, or a mixed gas of any combination thereof.

As shown in fig. 1, the upstream air supply port 51 is a device that is disposed above the grate 30 and supplies combustion air from the upstream side to the downstream side in the transfer direction TD. The downstream air supply port 52 is a device that is disposed above the grate 30 and supplies combustion air from the downstream side to the upstream side in the transfer direction TD. The upstream air supply port 51 is disposed on the upstream side in the transfer direction TD from the downstream air supply port 52 so as to face the downstream air supply port 52.

As shown in fig. 2, the secondary air supply unit 50 includes: a plurality of upstream air supply ports 51 (51 a, 51b, 51 c) arranged at intervals along a width direction WD perpendicular to the transfer direction TD; and a plurality of downstream air supply ports 52 (52 a, 52b, 52 c) arranged at intervals along the width direction WD perpendicular to the transfer direction TD.

The

dampers

53a, 53b, and 53c respectively adjust the amount of secondary air supplied from the blower 55 to the upstream

air supply ports

51a, 51b, and 51 c. Similarly, the

dampers

54a, 54b, and 54c respectively adjust the air volumes of the secondary air supplied from the blower 55 to the downstream

air supply ports

52a, 52b, and 52 c. The opening degrees of the

dampers

53 and 54 are controlled by control signals sent from the control unit 70.

The distribution state detection sensor 60 is a device that detects the distribution state of the unburned waste 200 transported by the grate 30 in the transport direction TD. The distribution state detection sensor 60 includes: a camera 61 that takes an image; and an image processing unit 62 that processes the image captured by the camera 61.

The camera 61 is an imaging device that can image visible light or infrared light, and is attached to a wall surface of the upper portion of the incinerator body 10. The camera 61 takes a visible image or an infrared image of a region extending over a predetermined range in the transfer direction TD of the grate 30, and captures a state of the waste 200 and a flame generated by combustion of volatile gas volatilized from the waste 200 from above the grate 30.

The image processing unit 62 detects a distribution state (first distribution state) in the transfer direction TD of the unburned waste 200 and a distribution state (second distribution state) in the width direction WD of the unburned waste 200 based on an image obtained by imaging the state of the waste 200 and the flame from above the grate 30 by the camera 61.

Here, a process in which the image processing unit 62 detects the first distribution state in the transfer direction TD of the unburned waste 200 and the second distribution state in the width direction WD of the unburned waste 200 based on the image captured by the camera 61 will be described with reference to fig. 3 and 4. Fig. 3 and 4 are diagrams showing an example of the distribution state of the waste 200 detected by the image processing unit 62 and the image captured by the camera 61. The positions P0, P2, P4 in fig. 2 correspond to the positions P0, P2, P4 in fig. 3 and 4.

Fig. 3 shows a distribution of the waste 200 in a state where the waste is supplied to the grate 30 in a predetermined amount within a predetermined range. On the other hand, fig. 4 shows a distribution state of the waste 200 in a state where the waste is supplied to the grate 30 in an amount exceeding a predetermined range. Fig. 4 shows a state in which the region in which the high-luminance image exists is shifted to the downstream side in the transfer direction TD with respect to fig. 3. This means that a large amount of waste 200 is supplied to the grate 30, and the position where the flame is most generated in fig. 3 moves to the downstream side in the transfer direction TD.

The images shown in fig. 3 and 4 are images in which the brightness of each pixel captured by the camera 61 is represented by shading. The darker the color, the lower the brightness value, and the lighter the color, the higher the brightness value. In the images shown in fig. 3 and 4, the dense pixel regions having high luminance values indicate regions where the volatile gas generated from the waste 200 burns to generate flames. In the images shown in fig. 3 and 4, the areas with dense pixels having high luminance values indicate areas with a large amount of waste 200.

The image processing unit 62 extracts pixels having a luminance value higher than a predetermined value from the image captured by the camera 61, for example, and extracts an area having a dense number of extracted pixels as an extraction area a. Further, the image processing unit 62 calculates the center of gravity position Pc of the luminance values of the extraction region a from the luminance values of all the pixels included in the extraction region a.

In fig. 3 and 4, the axis X is a straight line extending parallel to the transfer direction TD, and the axis Y is a straight line extending parallel to the width direction WD perpendicular to the transfer direction TD. The positions P0, P1, P2, P3, P4, and Pc shown in fig. 3 represent positions on the XY plane defined by the axis X and the axis Y, respectively. The positions on the axis Y of the positions P0, P1, P2 are Y0, and the positions on the axis X of the positions P0, P3, P4 are X0. The position P1 is a midpoint between the positions P0 and P2. Position P3 is the midpoint between positions P0 and P4. The position P5 is located at the position X1 on the axis X and coincides with the position P1, and the position Y is located at the position Y1 and coincides with the position P3.

The image processing unit 62 calculates the center of gravity Pc, and specifies the position on the axis X as Xc and the position on the axis Y as Yc. Then, the image processing unit 62 specifies the region R centered on the barycentric position Pc (Xc, yc). The region R has a first predetermined region R1 in the axis X direction and a second predetermined region R2 in the axis Y direction.

The region R determined from the position Pc of the center of gravity of the luminance value of the extraction region a indicates a region where the most flame is generated by burning the volatile gas generated from the waste 200. The first predetermined region r1 detected by the image processing unit 62 indicates a distribution state (first distribution state) in the transfer direction TD of the unburned waste 200. The second predetermined region r2 detected by the image processing unit 62 indicates the distribution state (second distribution state) of the unburned waste 200 in the width direction WD.

The distribution shown in the region R indicates volatile components (for example, CH) having an oxygen concentration higher than that in other regions and generated from the waste 200 ₄ CO) volatilization than other areasA combustion state with a large component. Further, since the oxygen concentration of the region R is higher than the oxygen concentration of the other regions, the distribution state shown by the region R indicates a combustion state in which the nox concentration is higher than the nox concentration of the other regions.

In the above description, it is assumed that: the distribution state detection sensor 60 detects the distribution state of the unburned waste 200 in the transfer direction TD and the distribution state of the unburned waste 200 in the width direction WD, based on the image obtained by imaging the waste 200 and the flame state from above the grate 30 by the camera 61, but other configurations are possible.

For example, the distribution state detection sensor 60 may detect the temperature distribution in the transfer direction TD as the distribution state in the transfer direction TD. Specifically, the distribution state detection sensor 60 may acquire a temperature distribution in the transfer direction TD from temperature sensors (not shown) disposed at a plurality of positions along the transfer direction TD above the grate 30, and detect a region having the highest temperature as the first predetermined region r1. In this case, the distribution state shown in the first predetermined region r1 indicates a combustion state in which the temperature is higher than the temperatures of the other regions.

Further, the distribution state detection sensor 60 may also detect the temperature distribution in the width direction WD as the distribution state in the width direction WD. Specifically, the distribution state detection sensor 60 may acquire a temperature distribution in the width direction WD from temperature sensors (not shown) disposed at a plurality of positions along the width direction WD above the grate 30, and detect a region having the highest temperature as the second predetermined region r2.

Instead of the temperature sensor, the distribution state detection sensor 60 may detect the gas composition distribution in the transfer direction TD as the distribution state in the transfer direction TD and detect the gas composition distribution in the width direction WD as the distribution state in the width direction WD. In this case, the distribution state detection sensor 60 detects a region in which the amount of the predetermined gas is large, which indicates that the unburned waste 200 is present in a large amount, as the first predetermined region r1 and the second predetermined region r2.

The control unit 70 is a device that controls the primary air supply unit 40 and the secondary air supply unit 50 based on the distribution state detected by the distribution state detection sensor 60. Here, the control Unit 70 is configured by, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and a computer-readable storage medium. As an example, a series of processes for realizing various functions is stored in a storage medium or the like in the form of a program, and the CPU reads the program into a RAM or the like and executes processing of information and arithmetic processing, thereby realizing various functions.

The control unit 70 controls the primary air supply unit 40 based on the distribution state of the transfer direction TD detected by the distribution state detection sensor 60 so as to supply more combustion air than in other areas to the first predetermined area r1 where more unburned waste 200 is present in the transfer direction TD.

In the example shown in fig. 3, the control unit 70 controls the primary air supply unit 40 such that the first flow rate of the combustion air supplied from the primary

air supply ports

41b, 41c disposed at positions close to the first predetermined region r1 is greater than the second flow rate of the combustion air supplied from the primary

air supply ports

41a, 41d, 41e disposed at positions close to other regions.

Regions ra, rb, rc, rd, and re along the axis X shown in fig. 3 indicate regions where the primary

air supply ports

41a, 41b, 41c, 41d, and 41e are arranged in the transfer direction TD, respectively. In fig. 3, the image processing unit 62 detects a region including the region rb and the region rc as a first predetermined region r1.

By making the first flow rate of the combustion air supplied from the primary

air supply ports

41b, 41c that supply the primary air to the zone rb and the zone rc larger than the second flow rate of the combustion air supplied from the primary

air supply ports

41a, 41d, 41e disposed at positions close to the other zones, the combustion of the waste 200 existing in the zone rb and the zone rc can be promoted.

On the other hand, in the example shown in fig. 4, the control unit 70 controls the primary air supply unit 40 such that the first flow rate of the combustion air supplied from the primary

air supply ports

41c, 41d disposed at positions close to the first predetermined region r1 is greater than the second flow rate of the combustion air supplied from the primary

air supply ports

41a, 41b, 41e disposed at positions close to other regions.

In fig. 4, the image processing unit 62 detects an area including the area rc and the area rd as the first predetermined area r1. By making the first flow rate of the combustion air supplied from the primary

air supply ports

41c, 41d that supply the primary air to the zone rc and the zone rd larger than the second flow rate of the combustion air supplied from the primary

air supply ports

41a, 41b, 41e disposed at positions close to the other zones, the combustion of the waste 200 existing in the zone rc and the zone rd can be promoted.

Further, the control unit 70 controls the secondary air supply unit 50 based on the distribution state of the transfer direction TD detected by the distribution state detection sensor 60 so as to supply more combustion air than in other regions to the first predetermined region r1 where more unburned waste 200 is present in the transfer direction TD.

In the example shown in fig. 3, since the first predetermined region r1 exists at a position closer to the upstream air supply port 51 than the downstream air supply port 52 in the transfer direction TD, the control unit 70 controls the secondary air supply unit 50 such that the flow rate of the combustion air supplied from the downstream air supply port 52 is larger than the flow rate of the combustion air supplied from the upstream air supply port 51.

More specifically, the control unit 70 controls the damper 53 and the damper 54 so that a position in the transfer direction TD where the combustion air supplied from the upstream air supply port 51 and the combustion air supplied from the downstream air supply port 52 join each other coincides with a position Xc that is a position on the axis X of the center of gravity position Pc.

In the example shown in fig. 3, the flow rate of the combustion air supplied from the downstream air supply port 52 is made larger than the flow rate of the combustion air supplied from the upstream air supply port 51, and the distance in the transfer direction TD between the downstream air supply port 52 and the center of gravity position Pc is made longer. This makes it possible to introduce the flame near the center of gravity position Pc downstream in the transfer direction TD, ensure the residence time of the volatile gas, and promote the mixing of the volatile gas near the center of gravity position Pc and the volatile gas downstream thereof.

In the example shown in fig. 3, the flow rate of the combustion air supplied from the upstream air supply port 51 is set to be smaller than the flow rate of the combustion air supplied from the downstream air supply port 52, and the upstream air supply port 51 is located at a short distance from the center of gravity position Pc in the transfer direction TD. By reducing the penetration force of the combustion air supplied from the upstream air supply port 51, the position close to the upstream air supply port 51 can be brought into a state of high oxygen concentration, and the unburned volatile gas is suppressed from being guided upward in an unburned state.

In the example shown in fig. 4, since the first predetermined region r1 exists at a position closer to the downstream air supply port 52 than the upstream air supply port 51 in the transfer direction TD, the control unit 70 controls the secondary air supply unit 50 such that the flow rate of the combustion air supplied from the upstream air supply port 51 is larger than the flow rate of the combustion air supplied from the downstream air supply port 52.

Further, the control unit 70 controls the secondary air supply unit 50 so as to supply more combustion air than the other region to the second predetermined region r2 in which more unburned waste 200 than the other region exists in the width direction WD, based on the distribution state in the width direction WD detected by the distribution state detection sensor 60.

Regions rf, rg, rh along the axis Y shown in fig. 3 respectively indicate regions where the upstream

air supply ports

51a, 51b, 51c are arranged in the width direction WD. Similarly, the regions rf, rg, rh indicate regions in which the downstream

air supply ports

52a, 52b, 52c are arranged in the width direction WD, respectively. In fig. 3, the image processing unit 62 detects a region including the region rf and the region rg as a second predetermined region r2.

In fig. 3, the image processing unit 62 detects a region including the region rf and the region rg as a second predetermined region r2. Therefore, in the example shown in fig. 3, the control unit 70 controls the damper 53 so that the supply amount of the combustion air supplied from the upstream

air supply ports

51a and 51b is larger than the supply amount of the combustion air supplied from the upstream air supply port 51 c. In the example shown in fig. 3, the controller 70 controls the damper 54 so that the supply amount of the combustion air supplied from the downstream

air supply ports

52a and 52b is larger than the supply amount of the combustion air supplied from the downstream air supply port 52 c.

The heat recovery boiler 80 is a device that generates steam using the combustion gas generated in the incinerator body 10. The combustion gas generated in the incinerator body 10 exchanges heat with the feed water flowing through a plurality of heat transfer tubes (not shown) provided in the heat recovery boiler 80. The combustion gas having finished heat exchange with the feed water flowing through the heat transfer pipe is guided from the heat recovery boiler 80 to the temperature lowering tower 85.

The temperature lowering tower 85 is a device for lowering the temperature of the combustion gas guided from the heat recovery boiler 80. The temperature lowering tower 85 lowers the temperature of the combustion gas by spraying water to the combustion gas. The combustion gas whose temperature is lowered by the temperature lowering tower 85 is guided to the dust collecting device 90.

The dust collector 90 removes soot contained in the combustion gas guided from the cooling tower 85. The combustion gas from which the soot is removed by the dust collecting device 90 is guided to a chimney 95 and discharged to the atmosphere.

Next, a method of controlling the grate-type incinerator 100 according to the present embodiment will be described with reference to fig. 5. Fig. 5 is a flowchart illustrating a method of controlling the grate-type incinerator 100 according to an embodiment of the present disclosure.

In step S101 (detection process), the distribution state detection sensor 60 detects the distribution state in the transfer direction TD and the distribution state in the width direction WD of the unburned waste 200 transferred by the grate 30. The distribution state detection sensor 60 transmits the detected distribution state in the transfer direction TD and the detected distribution state in the width direction WD to the control unit 70.

Specifically, the distribution state detection sensor 60 detects, as the distribution state in the transport direction TD, the first predetermined region r1 in which the most flame is generated by burning the volatile gas generated from the waste 200. The distribution state detection sensor 60 detects, as the distribution state in the width direction WD, the second predetermined region r2 in which the most generated flame is generated by burning the volatile gas generated from the waste 200.

In step S102 (control process), the control unit 70 controls the primary air supply unit 40 so as to supply more combustion air than the other area to the first predetermined area r1 where more unburned waste 200 is present in the transfer direction TD, based on the distribution state in the transfer direction TD detected in step S101.

Specifically, the controller 70 controls the primary air supply unit 40 such that the first flow rate of the combustion air supplied from the primary air supply port (at least any one of the primary

air supply ports

41a, 41b, 41c, 41d, and 41 e) disposed at a position close to the first predetermined region r1 is greater than the second flow rate of the combustion air supplied from the primary air supply port (at least any one of the primary

air supply ports

41a, 41b, 41c, 41d, and 41 e) disposed at a position close to the other region.

In step S102 (control process), the control unit 70 controls the secondary air supply unit 50 so as to supply more combustion air to the second predetermined region r2 in which more unburned waste 200 is present in the width direction WD than in the other region, based on the distribution state in the width direction WD detected in step S101.

Specifically, the control unit 70 controls the damper 53 such that the supply amount of the combustion air supplied from the upstream air supply port 51 (at least one of the upstream

air supply ports

51a, 51b, and 51 c) existing at a position close to the second predetermined region r2 is larger than the supply amount of the combustion air supplied from the upstream air supply port (at least one of the upstream

air supply ports

51a, 51b, and 51 c) existing in the other region.

Similarly, the controller 70 controls the damper 54 such that the supply amount of the combustion air supplied from the downstream air supply port 52 (at least any one of the downstream

air supply ports

52a, 52b, and 52 c) existing in a position close to the second predetermined region r2 is larger than the supply amount of the combustion air supplied from the downstream air supply port (any one of the downstream

air supply ports

52a, 52b, and 52 c) existing in the other region.

In step S103 (control process), the control unit 70 controls the secondary air supply unit 50 so as to supply more combustion air than in the other region to the first predetermined region r1 where more unburned waste 200 is present in the transfer direction TD, based on the distribution state in the transfer direction TD detected in step S101.

Specifically, the control unit 70 controls the damper 53 and the damper 54 such that the position in the transfer direction TD in which the combustion air supplied from the upstream-side air supply port 51 and the combustion air supplied from the downstream-side air supply port 52 merge with each other coincides with the first predetermined region r1.

In step S104, the control unit 70 determines whether or not to end the process of detecting the distribution state in the transfer direction TD and the distribution state in the width direction WD of the unburned waste 200 transferred by the grate 30. If it is determined as no, the control unit 70 executes the processing of step S101 to step S103 again, and if yes, the control unit 70 ends the processing of the present flowchart.

The operation and effect of the grate-type incinerator 100 according to the present embodiment described above will be described.

According to the grate-type incinerator 100 of the present embodiment, the distribution state of the unburned waste 200 supplied from the waste supply unit 20 to the incinerator body 10 and transferred by the grate 30 in the transfer direction TD is detected by the distribution state detection sensor 60. Then, based on the distribution state in the transfer direction TD of the unburned waste 200 detected by the distribution state detection sensor 60, the control unit 70 controls the primary air supply unit 40 and the secondary air supply unit 50 so as to supply more combustion air than in other areas to the first predetermined area r1 where more unburned waste 200 is present in the transfer direction TD.

Since the combustion of the unburned waste 200 in the first predetermined region r1 is promoted as compared with other regions, the combustion state in each region in the transport direction TD of the waste 200 can be appropriately controlled so that the waste 200 is completely combusted, based on the distribution state in the transport direction TD of the unburned waste 200. Since the supply amount of the combustion air in the transfer direction TD is appropriately controlled, it is possible to suppress the generation of CO due to the local air shortage and the generation of NOx due to the local air excess.

Further, according to the grate-type incinerator 100 of the present embodiment, the distribution state of the unburned waste 200 in the width direction WD perpendicular to the transfer direction TD can be detected, and the combustion state in each region in the width direction WD of the waste 200 can be appropriately controlled so that the waste 200 is completely combusted. Since the supply amount of the combustion air in the width direction WD is appropriately controlled, it is possible to suppress the generation of CO due to the local air shortage and the generation of NOx due to the local air excess.

Further, according to the grate-type incinerator 100 of the present embodiment, when the first predetermined region r1 in which more unburned waste 200 is present in the transfer direction TD than in other regions is present at a position closer to the downstream air supply port 52 than the upstream air supply port 51 in the transfer direction TD, the secondary air supply unit 50 is controlled so that the first flow rate of the combustion air supplied from the upstream air supply port 51 is larger than the second flow rate of the combustion air supplied from the downstream air supply port 52.

By making the first flow rate larger than the second flow rate, the point at which the combustion air supplied from the upstream air supply port 51 and the combustion air supplied from the downstream air supply port 52 merge becomes a position closer to the downstream air supply port 52 than the intermediate point between the upstream air supply port 51 and the downstream air supply port 52. Accordingly, more combustion air is supplied to the first predetermined region r1 than to the other regions, and combustion of the unburned waste 200 in the first predetermined region r1 can be promoted.

When the first flow rate is larger than the second flow rate, the unburned volatile gas present in the vicinity of the first predetermined region r1 is sucked by the flow of the combustion air introduced from the upstream air supply port 51 into the incinerator body 10, and moves from the first predetermined region r1 to the upstream air supply port 51. This disperses the volatile gas generated from the waste 200 along the transfer direction TD, and can promote combustion of the waste 200 over a wide area of the incinerator body 10.

According to the grate-type incinerator 100 of the present embodiment, the primary air supply unit 40 is controlled so that the first flow rate of the combustion air supplied from the primary air supply port disposed at a position close to the first predetermined region r1 is greater than the second flow rate of the combustion air supplied from the primary air supply port disposed at a position close to the other region, and the first predetermined region r1 contains more unburned waste 200 than the other region in the transfer direction TD. By making the first flow rate larger than the second flow rate, more combustion air is supplied to the first predetermined region r1 than to the other regions, so that combustion of the unburned waste 200 in the first predetermined region r1 can be promoted.

The combustion furnace described in the above-described embodiment is understood as follows, for example.

The disclosed combustion furnace (100) is a combustion furnace (100) that burns a combustion target while transferring the combustion target along a transfer direction, wherein the combustion furnace (100) is provided with: a furnace body (10) for burning the material to be burned; a combustion object supply unit (20) for supplying the combustion object to the combustion furnace main body; a transfer unit (30) that is provided in the combustion furnace main body (10) and transfers the combustion target supplied to the combustion furnace main body by the combustion target supply unit in the transfer direction; air supply units (40, 50) for supplying combustion air to the combustion furnace main body; a detection unit (60) that detects the distribution state in the transfer direction of the unburned objects to be burned transferred by the transfer unit; and a control unit (70) that controls the air supply unit so as to supply more combustion air than the other region to a first predetermined region in which the combustion target is present in more unburned form in the transfer direction than in the other region, based on the distribution state detected by the detection unit.

According to the combustion furnace of the present disclosure, the distribution state in the transfer direction of the unburned objects to be burned supplied from the object-to-be-burned supply unit to the combustion furnace main body and transferred by the transfer unit is detected by the detection unit. The control unit controls the air supply unit so that more combustion air is supplied to a first predetermined region (r 1) in which more unburned objects to be combusted are present in the transport direction than in other regions, based on the distribution state in the transport direction of the unburned objects to be combusted detected by the detection unit.

Since the combustion of the unburned objects to be burned in the first predetermined region is promoted as compared with the other regions, the combustion state in each region in the transfer direction of the objects to be burned can be appropriately controlled so as to completely burn the objects to be burned, based on the distribution state in the transfer direction of the unburned objects to be burned. Since the supply amount of the combustion air in the transfer direction is appropriately controlled, it is possible to suppress the generation of CO due to the local air shortage and the generation of NOx due to the local air excess.

In the combustion furnace of the present disclosure, the detection unit may detect the distribution state based on an image obtained by imaging the object to be burned from above the transfer unit.

According to the combustion furnace of the present configuration, the distribution state can be detected based on the image of the combustion target captured from above the transfer unit, and the combustion state in each region in the transfer direction of the combustion target can be appropriately controlled so as to completely combust the combustion target.

In the combustion furnace of the present disclosure, the detection unit may detect the distribution state based on a temperature distribution in the transfer direction.

According to the combustion furnace of the present configuration, the distribution state can be detected based on the temperature distribution in the transfer direction, and the combustion state in each region in the transfer direction of the combustion target can be appropriately controlled so as to completely combust the combustion target.

In the combustion furnace of the present disclosure, the detection unit may detect the distribution state of the unburned objects in a width direction orthogonal to the transfer direction, and the control unit may control the air supply unit so that the combustion air is supplied to a second predetermined region (r 2) in which the objects are unburned in the width direction more than in other regions, based on the distribution state in the width direction detected by the detection unit.

According to the combustion furnace of the present configuration, the distribution state of the unburned combustion target in the width direction orthogonal to the transfer direction can be detected, and the combustion state in each region in the width direction of the combustion target can be appropriately controlled so as to completely combust the combustion target. Since the supply amount of the combustion air in the width direction is appropriately controlled, it is possible to suppress the generation of CO due to the local air shortage and the generation of NOx due to the local air excess.

In the burner of the present disclosure, the air supply unit may include: an upstream air supply port (51) which is arranged above the transfer portion and supplies the combustion air from the upstream side to the downstream side in the transfer direction; and a downstream air supply port (52) that is disposed above the transfer portion and that supplies the combustion air from a downstream side to an upstream side in the transfer direction, wherein the upstream air supply port is disposed at a position that is on the upstream side in the transfer direction relative to the downstream air supply port so as to face the downstream air supply port, and wherein the control portion controls the air supply portion such that a first flow rate of the combustion air supplied from the upstream air supply port is greater than a second flow rate of the combustion air supplied from the downstream air supply port when the first predetermined region is present at a position that is on the downstream side relative to the upstream air supply port in the transfer direction.

According to the combustion furnace of the present configuration, when the first predetermined region in which the unburned objects to be burned are present more than the other regions in the transport direction is present at the position closer to the downstream air supply port than the upstream air supply port in the transport direction, the air supply unit is controlled so that the first flow rate of the combustion air supplied from the upstream air supply port is greater than the second flow rate of the combustion air supplied from the downstream air supply port.

When the first flow rate is larger than the second flow rate, a point at which the combustion air supplied from the upstream-side air supply port and the combustion air supplied from the downstream-side air supply port merge together is located closer to the downstream-side air supply port than an intermediate point between the upstream-side air supply port and the downstream-side air supply port. This can supply more combustion air to the first predetermined region than to the other regions, thereby promoting combustion of unburned objects to be combusted in the first predetermined region.

Further, when the first flow rate is larger than the second flow rate, the unburned volatile gas present in the vicinity of the first predetermined region is sucked by the flow of the combustion air introduced from the upstream air supply port into the combustion furnace main body, and moves from the first predetermined region to the upstream air supply port side. Thus, the volatile gas generated from the combustion object is dispersed in the transfer direction, and the combustion of the combustion object can be promoted over a wide area of the combustion furnace main body.

In the combustion furnace of the present disclosure, the air supply unit may include: an upstream air supply port (51) which is arranged above the transfer portion and supplies the combustion air from the upstream side to the downstream side in the transfer direction; and a downstream air supply port (52) that is disposed above the transfer portion and that supplies the combustion air from a downstream side to an upstream side in the transfer direction, wherein the upstream air supply port is disposed at a position that is closer to the upstream side in the transfer direction than the downstream air supply port so as to face the downstream air supply port, and wherein the control portion controls the air supply portion such that a first flow rate of the combustion air supplied from the downstream air supply port is greater than a second flow rate of the combustion air supplied from the upstream air supply port when the first predetermined region is present at a position that is closer to the upstream air supply port than the downstream air supply port in the transfer direction.

According to the combustion furnace of the present configuration, when the first predetermined region in which the unburned objects to be burned are present more than the other regions in the transport direction is present at the position closer to the upstream air supply port than the downstream air supply port in the transport direction, the air supply unit is controlled so that the first flow rate of the combustion air supplied from the downstream air supply port is larger than the second flow rate of the combustion air supplied from the upstream air supply port.

When the first flow rate is larger than the second flow rate, a point at which the combustion air supplied from the downstream-side air supply port and the combustion air supplied from the upstream-side air supply port merge together is located closer to the upstream-side air supply port than an intermediate point between the downstream-side air supply port and the upstream-side air supply port. This can supply more combustion air to the first predetermined region than to the other regions, thereby promoting combustion of unburned objects to be combusted in the first predetermined region.

Further, by making the first flow rate larger than the second flow rate, the unburned volatile gas present in the vicinity of the first predetermined region is sucked by the flow of the combustion air introduced from the downstream air supply port into the combustion furnace main body, and moves from the first predetermined region toward the downstream air supply port. Thus, the volatile gas generated from the combustion target is dispersed in the transfer direction, and the combustion of the combustion target can be promoted over a wide area of the combustion furnace main body.

In the burner of the present disclosure, the air supply unit may include: and a plurality of primary air supply ports (41 a-41 e) for supplying the combustion air to the object to be combusted transferred by the transfer unit from a lower side of the transfer unit, wherein the plurality of primary air supply ports are arranged along the transfer direction, and the control unit controls the air supply unit so that a first flow rate of the combustion air supplied from the primary air supply port arranged at a position close to the first predetermined region is larger than a second flow rate of the combustion air supplied from the primary air supply port arranged at a position close to the other region.

According to the combustion furnace of this configuration, the air supply unit is controlled so that the first flow rate of the combustion air supplied from the primary air supply port arranged at a position close to the first predetermined region in which the unburned objects to be combusted are present in a larger amount in the transfer direction than the second flow rate of the combustion air supplied from the primary air supply port arranged at a position close to the other region. By making the first flow rate larger than the second flow rate, more combustion air is supplied to the first predetermined region than to the other region, and combustion of unburned objects to be combusted in the first predetermined region can be promoted.

The control method of the combustion furnace described in the above-described embodiment is understood as follows, for example.

A method of controlling a combustion furnace according to the present disclosure is a method of controlling a combustion furnace that combusts a combustion target while transferring the combustion target along a transfer direction, the combustion furnace including: a combustion furnace main body that burns the combustion target; a combustion object supply unit configured to supply the combustion object to the combustion furnace main body; a transfer unit that is provided in the burner main body and transfers the combustion target supplied from the combustion target supply unit to the burner main body in the transfer direction; and an air supply unit configured to supply combustion air to the combustion furnace main body, the method for controlling the combustion furnace including: a detection process of detecting a distribution state in the transfer direction of the unburned object to be burned transferred by the transfer portion; and a control step of controlling the air supply unit so as to supply more combustion air than the other region to a first predetermined region in which the object to be combusted is not combusted more than the other region in the transfer direction, based on the distribution state detected by the detection step.

According to the combustion furnace of the present disclosure, the distribution state in the transfer direction of the unburned objects to be burned supplied from the object-to-be-burned supply unit to the combustion furnace main body and transferred by the transfer unit is detected by the detection process. The air supply unit is controlled during the control so as to supply more combustion air than the other region to a first predetermined region in which the unburned objects to be combusted are present more in the transfer direction than the other region, based on the distribution state in the transfer direction of the unburned objects to be combusted detected in the detection process.

In the control method of the combustion furnace according to the present disclosure, the distribution state may be detected based on an image obtained by imaging the combustion target from above the transfer unit in the detection process.

According to the control method of the combustion furnace of the present configuration, the distribution state can be detected based on the image of the combustion target captured from above the transfer unit, and the combustion state in each region in the transfer direction of the combustion target can be appropriately controlled so as to completely combust the combustion target.

In the control method of the combustion furnace according to the present disclosure, the temperature distribution in the transfer direction may be detected as the distribution state in the detection process.

According to the control method of the combustion furnace of the present configuration, the temperature distribution in the transfer direction can be detected as the distribution state, and the combustion state in each region in the transfer direction of the combustion target can be appropriately controlled so as to completely combust the combustion target.

In the control method of the combustion furnace according to the present disclosure, the distribution state of the unburned combustion target in the width direction orthogonal to the transfer direction may be detected in the detection process, and the air supply unit may be controlled based on the distribution state in the width direction detected in the detection process so as to supply more combustion air than in another region to a second predetermined region in which the combustion target is unburned in the width direction.

According to the control method for the combustion furnace of the present configuration, the distribution state of the unburned objects to be burned in the width direction orthogonal to the transfer direction can be detected, and the combustion state in each region in the width direction of the objects to be burned can be appropriately controlled so as to completely burn the objects to be burned. Since the supply amount of the combustion air in the width direction is appropriately controlled, it is possible to suppress the generation of CO due to the local air shortage and the generation of NOx due to the local air excess.

In the control method of the combustion furnace according to the present disclosure, the air supply unit may include: an upstream air supply port arranged above the transfer portion and configured to supply the combustion air from an upstream side to a downstream side in the transfer direction; and a downstream air supply port that is disposed above the transfer portion and supplies the combustion air from a downstream side to an upstream side in the transfer direction, wherein the upstream air supply port is disposed at a position on the upstream side in the transfer direction from the downstream air supply port so as to face the downstream air supply port, and wherein the air supply portion is controlled so that a first flow rate of the combustion air supplied from the upstream air supply port is larger than a second flow rate of the combustion air supplied from the downstream air supply port when the first predetermined region exists at a position closer to the downstream air supply port than the upstream air supply port in the transfer direction during the control.

According to the control method for the combustion furnace of the present configuration, when the first predetermined region in which the unburned objects to be burned are present more than the other regions in the transfer direction is present at the position closer to the downstream air supply port than the upstream air supply port in the transfer direction, the air supply unit is controlled so that the first flow rate of the combustion air supplied from the upstream air supply port is greater than the second flow rate of the combustion air supplied from the downstream air supply port.

By making the first flow rate larger than the second flow rate, the point at which the combustion air supplied from the upstream-side air supply port and the combustion air supplied from the downstream-side air supply port merge becomes a position closer to the downstream-side air supply port than the intermediate point between the upstream-side air supply port and the downstream-side air supply port. This can supply more combustion air to the first predetermined region than to the other regions, thereby promoting combustion of unburned objects to be combusted in the first predetermined region.

In the control method of the combustion furnace according to the present disclosure, the air supply unit may include: an upstream air supply port arranged above the transfer portion and configured to supply the combustion air from an upstream side to a downstream side in the transfer direction; and a downstream air supply port that is disposed above the transfer portion and supplies the combustion air from a downstream side to an upstream side in the transfer direction, wherein the upstream air supply port is disposed at a position on the upstream side in the transfer direction from the downstream air supply port so as to face the downstream air supply port, and wherein the air supply portion is controlled so that a first flow rate of the combustion air supplied from the downstream air supply port is larger than a second flow rate of the combustion air supplied from the upstream air supply port when the first predetermined region is present at a position on the upstream side in the transfer direction from the downstream air supply port.

According to the control method for the combustion furnace of the present configuration, when the first predetermined region in which the unburned objects to be combusted existing more than in other regions in the transfer direction is present at the position closer to the upstream air supply port than the downstream air supply port in the transfer direction, the air supply unit is controlled so that the first flow rate of the combustion air supplied from the downstream air supply port is larger than the second flow rate of the combustion air supplied from the upstream air supply port.

Further, by making the first flow rate larger than the second flow rate, the unburned volatile gas present in the vicinity of the first predetermined region is sucked by the flow of the combustion air introduced from the downstream air supply port into the combustion furnace main body, and moves from the first predetermined region toward the downstream air supply port. Thus, the volatile gas generated from the combustion object is dispersed in the transfer direction, and the combustion of the combustion object can be promoted over a wide area of the combustion furnace main body.

In the control method of the combustion furnace according to the present disclosure, the air supply unit may include: and a plurality of primary air supply ports for supplying the combustion air to the object to be burned transferred by the transfer portion from a lower side of the transfer portion, wherein the plurality of primary air supply ports are arranged along the transfer direction, and the air supply portion is controlled so that a first flow rate of the combustion air supplied from the primary air supply port arranged at a position close to the first predetermined region is larger than a second flow rate of the combustion air supplied from the primary air supply port arranged at a position close to the other region.

According to the method of controlling a combustion furnace of this configuration, the air supply unit is controlled so that the first flow rate of the combustion air supplied from the primary air supply port arranged at a position close to the first predetermined region in which the unburned objects to be combusted are present in a larger amount in the transfer direction than the second flow rate of the combustion air supplied from the primary air supply port arranged at a position close to the other region. By making the first flow rate larger than the second flow rate, more combustion air is supplied to the first predetermined region than to the other region, and combustion of unburned objects to be combusted in the first predetermined region can be promoted.

Description of the reference numerals

10: an incinerator body (combustion furnace body);

20: a waste supply unit (a material to be burned supply unit);

21: feeding into a hopper;

22: a feeder;

30: a grate (transfer section);

40: a primary air supply unit;

41a, 41b, 41c, 41d, 41e: a primary air supply port;

42a, 42b, 42c, 42d, 42e: a damper;

43: a blower;

50: a secondary air supply unit;

51: an upstream-side air supply port;

52: a downstream side air supply port;

53. 54: a damper;

55: a blower;

60: a distribution state detection sensor;

61: a camera;

62: an image processing unit;

70: a control unit;

80: a heat recovery boiler;

85: a cooling tower;

90: a dust collecting device;

95: a chimney;

100: grate-type incinerators (combustion furnaces);

200: waste materials;

a: extracting an area;

pc: a position of a center of gravity;

r: an area;

TD: a transfer direction;

WD: a width direction;

r1: a first prescribed region;

r2: a second predetermined region.

Claims

1. A combustion furnace for burning a combustion object while transferring the combustion object along a transfer direction, wherein,

the combustion furnace is provided with:

a combustion furnace main body that burns the combustion target;

a combustion object supply unit configured to supply the combustion object to the combustion furnace main body;

a transfer portion provided in the burner main body and transferring the burning target supplied from the burning target supply portion to the burner main body in the transfer direction;

an air supply unit for supplying combustion air to the combustion furnace main body;

a detection unit that detects a distribution state in the transfer direction of the unburned objects to be burned transferred by the transfer unit; and

and a control unit configured to control the air supply unit so as to supply more combustion air than the other region to a first predetermined region in which the object to be combusted is not combusted more than the other region in the transfer direction, based on the distribution state detected by the detection unit.

2. The combustion furnace of claim 1,

the detection unit detects the distribution state based on an image obtained by imaging the combustion target from above the transfer unit.

3. The combustion furnace of claim 1,

the detection unit detects the distribution state based on the temperature distribution in the transfer direction.

4. The combustion furnace according to any one of claims 1 to 3,

the detection unit detects the distribution state of the unburned objects in a width direction orthogonal to the transfer direction,

the control unit controls the air supply unit so as to supply more combustion air than the other region to a second predetermined region in which the object to be combusted that is unburned in the width direction is present in more amount than the other region, based on the distribution state in the width direction detected by the detection unit.

5. The combustion furnace according to any one of claims 1 to 4,

the air supply unit includes:

an upstream air supply port arranged above the transfer portion and configured to supply the combustion air from an upstream side to a downstream side in the transfer direction; and

a downstream air supply port disposed above the transfer portion and supplying the combustion air from a downstream side to an upstream side in the transfer direction,

the upstream air supply port is disposed on an upstream side in the transfer direction relative to the downstream air supply port so as to face the downstream air supply port,

when the first predetermined region is present at a position closer to the downstream-side air supply port than the upstream-side air supply port in the transport direction, the control unit controls the air supply unit such that a first flow rate of the combustion air supplied from the upstream-side air supply port is larger than a second flow rate of the combustion air supplied from the downstream-side air supply port.

6. The combustion furnace according to any one of claims 1 to 4,

the air supply unit includes:

when the first predetermined region is present at a position closer to the upstream-side air supply port than the downstream-side air supply port in the transport direction, the control unit controls the air supply unit such that a first flow rate of the combustion air supplied from the downstream-side air supply port is larger than a second flow rate of the combustion air supplied from the upstream-side air supply port.

7. The combustion furnace as claimed in any one of claims 1 to 5,

the air supply unit includes: a plurality of primary air supply ports for supplying the combustion air to the object to be combusted transferred by the transfer portion from a lower side of the transfer portion,

a plurality of the primary air supply ports are arranged along the transfer direction,

the control unit controls the air supply unit such that a first flow rate of the combustion air supplied from the primary air supply port disposed at a position close to the first predetermined region is larger than a second flow rate of the combustion air supplied from the primary air supply port disposed at a position close to the other region.

8. A method for controlling a combustion furnace for burning a combustion target while transferring the combustion target along a transfer direction, wherein,

the combustion furnace is provided with:

a combustion furnace main body that burns the combustion target;

a transfer portion provided in the burner main body and transferring the burning target supplied from the burning target supply portion to the burner main body in the transfer direction; and

an air supply unit for supplying combustion air to the combustion furnace main body,

the method for controlling a combustion furnace includes:

a detection step of detecting a distribution state of the unburned objects to be burned transferred by the transfer portion in the transfer direction; and

and a control step of controlling the air supply unit so as to supply more combustion air than the other region to a first predetermined region in which the object to be combusted is not combusted more than the other region in the transfer direction, based on the distribution state detected by the detection step.

9. The control method for a combustion furnace according to claim 8,

in the detecting step, the distribution state is detected based on an image obtained by imaging the combustion object from above the transfer unit.

10. The control method for a combustion furnace according to claim 8,

in the detecting, a temperature distribution in the transfer direction is detected as the distribution state.

11. The control method of a combustion furnace according to any one of claims 8 to 10,

detecting the distribution state of the unburned objects in a width direction orthogonal to the transfer direction in the detecting step,

in the control, the air supply unit is controlled based on the distribution state in the width direction detected in the detection so as to supply more combustion air than in another region to a second predetermined region in which the object to be combusted that is unburned in the width direction is present than in the other region.

12. The control method of a combustion furnace according to any one of claims 8 to 11,

the air supply unit includes:

in the control, when the first predetermined region is present at a position closer to the downstream-side air supply port than the upstream-side air supply port in the transfer direction, the air supply unit is controlled so that a first flow rate of the combustion air supplied from the upstream-side air supply port is larger than a second flow rate of the combustion air supplied from the downstream-side air supply port.

13. The control method of a combustion furnace according to any one of claims 8 to 11,

the air supply unit includes:

in the control, when the first predetermined region is present at a position closer to the upstream-side air supply port than the downstream-side air supply port in the transfer direction, the air supply unit is controlled so that a first flow rate of the combustion air supplied from the downstream-side air supply port is larger than a second flow rate of the combustion air supplied from the upstream-side air supply port.

14. The control method of a combustion furnace according to any one of claims 8 to 12,

in the control, the air supply unit is controlled such that a first flow rate of the combustion air supplied from the primary air supply port disposed at a position close to the first predetermined region is larger than a second flow rate of the combustion air supplied from the primary air supply port disposed at a position close to the other region.