Combustion furnace and control method for a combustion furnace

Abstract

The present invention appropriately controls a combustion state of a combustible according to a distribution state in a moving direction of the combustible moved by a grate. The present invention provides a grate-type incinerator (100) including: an incinerator main body (10); a waste supply part (20) that supplies a waste (200) to the incinerator main body; a grate (30) that moves the waste supplied to the incinerator main body by the waste supply part in a moving direction (TD); a primary air supply part (40) and a secondary air supply part (50) that supply combustion air to the incinerator main body; a distribution state detection sensor (60) that detects a distribution state in the moving direction of the uncombusted waste moved by the grate; and a control part (70) that controls the primary air supply part and the secondary air supply part based on the detected distribution state so as to supply more combustion air to a first prescribed region in which there is more uncombusted waste in the moving direction than in other regions than in the other regions.

Description

Technical Field

[0001] This disclosure relates to a combustion furnace and a method for controlling the combustion furnace. Background Technology

[0002] A grate incinerator is used as an incinerator for burning waste and other combustible materials. A grate incinerator has a grate (furnace grate) composed of alternating fixed and movable sections. A hydraulic system moves the movable sections back and forth, thereby simultaneously stirring and conveying the combustible material fed from the hopper on the grate, while drying and combustion occur. The dried and burned combustible material becomes ash and is discharged from the incinerator.

[0003] In such grate incinerators, it is crucial to monitor the state of the combusted material and ash on the grate to improve combustion efficiency. Regarding methods for monitoring the state of the combusted material on the grate in grate incinerators, Patent Document 1 is known, for example. Patent Document 1 discloses methods for determining the location of the combustion zone of the combusted material and the boundary between the combusted material and the ash (i.e., the burnout point), the stacking height of the combusted material or ash, and adjusting the supply rate or conveying speed of the combusted material.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2018-155411 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] When waste or other combustible materials are supplied to the grate, the distribution of unburned combustible materials along the conveying direction changes depending on the time variation of the conveying speed achieved by the feeder and the properties of the combustible materials, such as the moisture content. For example, when a large amount of combustible material is temporarily supplied to the grate, the combustible material guided to the grate may be pushed downstream in the conveying direction, creating areas with more combustible material than other areas. In this case, it may become impossible to supply sufficient combustion air to areas with more combustible material than other areas, resulting in incomplete combustion of the combustible material.

[0009] However, Patent Document 1 controls the supply of the combustible material based on local conditions such as the location of the burnout point and the stacking height of the combustible material or ash, and cannot properly control the combustion state of the combustible material according to the distribution of the unburned combustible material in the conveying direction of the grate.

[0010] For example, if the amount of material supplied to the grate changes over time, the combustion state of the material in the direction of its movement also changes over time according to that change, but the combustion state of the material cannot be controlled based on such changes.

[0011] This disclosure was made in view of the following circumstances, and its object is to provide a combustion furnace and a method for controlling the combustion furnace that can appropriately control the combustion state of the combusted material based on the distribution state of the unburned combusted material in the conveying direction of the conveying section.

[0012] Technical solution

[0013] To address the aforementioned issues, this disclosure adopts the following solution.

[0014] One aspect of this disclosure is a combustion furnace that ignites a combustor while it is being transported along a transport direction. The combustion furnace comprises: a combustion furnace body for igniting the combustor; a combustor supply unit for supplying the combustor to the combustion furnace body; a transport unit disposed on the combustion furnace body and transporting the combustor supplied to the combustion furnace body by the combustor supply unit in the transport direction; an air supply unit for supplying combustion air to the combustion furnace body; a detection unit for detecting the distribution of unburned combustor transported by the transport unit in the transport direction; and a control unit for controlling the air supply unit based on the distribution detected by the detection unit, so as to supply more combustion air than other regions to a first predetermined region in the transport direction where there are more unburned combustors than in other regions.

[0015] One aspect of this disclosure is a method for controlling a combustion furnace, which involves igniting a combustor while it is being moved along a conveying direction. The combustion furnace comprises: a combustion furnace body for igniting the combustor; a combustor supply unit for supplying the combustor to the combustion furnace body; a conveying unit disposed on the combustion furnace body and for conveying the combustor supplied by the combustor supply unit to the combustion furnace body in the conveying direction; and an air supply unit for supplying combustion air to the combustion furnace body. The control method comprises: a detection process for detecting the distribution state of unburned combustor conveyed by the conveying unit in the conveying direction; and a control process for controlling the air supply unit based on the distribution state detected by the detection process, so as to supply more combustion air than other regions to a first predetermined region in the conveying direction where there are more unburned combustors than in other regions.

[0016] Beneficial effects

[0017] According to this disclosure, a combustion furnace and a method for controlling the combustion furnace can be provided that can appropriately control the combustion state of the combusted material based on the distribution state of the unburned combusted material in the conveying direction of the conveying unit. Attached Figure Description

[0018] Figure 1 This is a schematic cross-sectional view of a grate incinerator according to one embodiment of the present disclosure.

[0019] Figure 2 yes Figure 1 The cross-sectional view shown is of the location of the secondary air supply section in the grate incinerator configuration.

[0020] Figure 3 This is a diagram illustrating an example of the distribution of waste captured by a camera and detected by the image processing unit.

[0021] Figure 4 This is a diagram illustrating an example of the distribution of waste captured by a camera and detected by the image processing unit.

[0022] Figure 5 This is a flowchart illustrating a control method for a grate incinerator according to one embodiment of the present disclosure. Detailed Implementation

[0023] Hereinafter, with reference to the accompanying drawings, a grate incinerator (combustion furnace) 100 according to one embodiment of the present disclosure will be described. Figure 1 This is a schematic cross-sectional view of a grate incinerator 100 according to one embodiment of the present disclosure. Figure 2 yes Figure 1 The cross-sectional view shown is of the location of the secondary air supply section in the grate incinerator configuration.

[0024] The following description uses a grate incinerator 100 as an example of a combustion furnace for burning waste 200, but other combustion furnaces may be used instead of the grate incinerator 100. Other combustion furnaces include, for example, pulverized coal boilers and kilns.

[0025] The grate incinerator 100 of this embodiment is a device that burns waste 200, which is the material to be burned, while moving it in the conveying direction TD. For example... Figure 1As shown, the grate incinerator 100 includes an incinerator body (combustion furnace body) 10, a waste supply unit (combustible 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 status detection sensor (detection unit) 60, a control unit 70, a heat recovery boiler 80, a cooling tower 85, a dust collection device 90, and a chimney 95. Here, the waste 200 is solid waste, such as household waste including solid waste composed of paper, plastic, etc.

[0026] The incinerator body 10 is a device for burning the waste 200 conveyed by the grate 30. The incinerator body 10 forms a combustion space for burning the waste 200 by means of furnace walls arranged in a manner that surround the waste 200 conveyed by the grate 30.

[0027] The waste supply unit (combustion material supply unit) 20 is a device for supplying waste 200 to the incinerator body 10. The waste supply unit 20 includes: a feeding hopper 21 for receiving waste 200; and a feeder 22 for supplying the waste 200 fed into the feeding hopper 21 to the incinerator body 10. For example, a push-in type feeder 22 can be used as the feeder 22. The push-in type feeder 22 is a device that repeatedly performs the action of pushing waste 200 into the incinerator body 10 via a push-in member (not shown) and the action of separating the push-in member from the incinerator body 10.

[0028] The grate 30 is a device installed on the incinerator body 10 and conveys waste 200 supplied to the incinerator body 10 by the waste supply unit 20 along the conveying direction TD. The grate 30 has a metal grate (not shown), which mixes and stirs the waste 200 and conveys it in the conveying direction TD while drying / burning it. The grate is composed of alternating fixed sections (not shown) and movable sections (not shown), and the movable sections are reciprocated by a hydraulic device (not shown), thereby conveying the waste 200.

[0029] The primary air supply unit 40 is a device for supplying combustion air to the incinerator body 10. The primary air supply unit 40 has multiple primary air supply ports 41a, 41b, 41c, 41d, and 41e, multiple dampers 42a, 42b, 42c, 42d, and 42e, and a blower 43. The multiple primary air supply ports 41a, 41b, 41c, 41d, and 41e are arranged at open intervals from upstream to downstream along the conveying direction TD.

[0030] Multiple dampers 42a, 42b, 42c, 42d, and 42e respectively adjust the airflow of primary air supplied from the blower 43 to multiple primary air supply ports 41a, 41b, 41c, 41d, and 41e. The opening degree of dampers 42a, 42b, 42c, 42d, and 42e is controlled by control signals sent from the control unit 70.

[0031] The blower 43 is designed to supply air to the atmosphere, but other options are also possible. For example, the blower 43 may supply air that has been temperature-adjusted by an air preheater (not shown), combustion gases produced in the incinerator body 10, oxygen-enriched gases, and mixtures thereof.

[0032] The secondary air supply unit 50 is a device that supplies combustion air to the incinerator body 10. The secondary air supply unit 50 has multiple upstream air supply ports 51, multiple downstream air supply ports 52, multiple dampers 53, multiple dampers 54, and a blower 55.

[0033] The blower 55 is designed to supply air to the atmosphere, but other options are also possible. For example, the blower 55 may supply air that has been temperature-adjusted by an air preheater (not shown), combustion gases generated in the incinerator body 10, combustion gases discharged from the dust collection device 90, oxygen-enriched gases, and mixtures of these gases in any combination.

[0034] like Figure 1 As shown, the upstream air supply port 51 is a device disposed above the grate 30 and supplies combustion air from the upstream side to the downstream side in the conveying direction TD. The downstream air supply port 52 is a device disposed above the grate 30 and supplies combustion air from the downstream side to the upstream side in the conveying direction TD. The upstream air supply port 51 is disposed opposite to the downstream air supply port 52 on the upstream side of the conveying direction TD.

[0035] like Figure 2 As shown, the secondary air supply unit 50 has: a plurality of upstream air supply ports 51 (51a, 51b, 51c) arranged at intervals along the width direction WD orthogonal to the transfer direction TD; and a plurality of downstream air supply ports 52 (52a, 52b, 52c) arranged at intervals along the width direction WD orthogonal to the transfer direction TD.

[0036] Multiple dampers 53a, 53b, and 53c adjust the airflow rate of secondary air supplied from the blower 55 to multiple upstream air supply ports 51a, 51b, and 51c, respectively. Similarly, multiple dampers 54a, 54b, and 54c adjust the airflow rate of secondary air supplied from the blower 55 to multiple downstream air supply ports 52a, 52b, and 52c, respectively. The opening degree of dampers 53 and 54 is controlled by control signals sent from the control unit 70.

[0037] The distribution state detection sensor 60 is a device for detecting the distribution state of unburned waste 200 transported by the grate 30 in the transport direction TD. The distribution state detection sensor 60 includes: a camera 61 for capturing images; and an image processing unit 62 for processing the images captured by the camera 61.

[0038] Camera 61 is a camera capable of capturing visible light or infrared light, and is mounted on the upper wall of the incinerator body 10. Camera 61 captures the state of the waste 200 and the flame of the combustion of volatile gases emanating from the waste 200 from above the grate 30, using a defined area covering the conveying direction TD of the grate 30 as the visible or infrared image.

[0039] The image processing unit 62 detects the distribution state of the unburned waste 200 in the conveying direction TD (first distribution state) and the distribution state of the unburned waste 200 in the width direction WD (second distribution state) based on the image obtained by the camera 61 from above the grate 30 capturing the state of the waste 200 and the flame.

[0040] Here, refer to Figure 3 and Figure 4 The processing by the image processing unit 62 to detect the first distribution state of the unburned waste 200 in the transport direction TD and the second distribution state of the unburned waste 200 in the width direction WD based on the image captured by the camera 61 will be described. Figure 3 and Figure 4 This is a diagram illustrating an example of the distribution of images captured by camera 61 and waste 200 detected by image processing unit 62. Figure 2 Positions P0, P2, and P4 in the middle Figure 3 and Figure 4 The positions P0, P2, and P4 in the diagram correspond to each other.

[0041] Figure 3 This indicates the distribution of waste 200 in a predetermined amount within a specified range to the grate 30. On the other hand, Figure 4 This indicates the distribution of waste 200 when it is supplied to the grate 30 in an amount exceeding a predetermined range. Figure 4The image shows the area with high brightness in contrast. Figure 3 The state of movement is downstream of the conveying direction TD. This indicates that due to the large amount of waste 200 being supplied to the grate 30, in Figure 3 The location where the flames are most intense moves downstream of the TD direction of transport.

[0042] Figure 3 and Figure 4 The image shown uses shading to represent the brightness of each pixel captured by camera 61. A darker color indicates a lower brightness value, and a lighter color indicates a higher brightness value. Figure 3 and Figure 4 In the image shown, the densely packed areas with high brightness values ​​represent regions where flames are produced by the combustion of volatile gases from waste 200. Figure 3 and Figure 4 In the image shown, the densely packed areas with high brightness values ​​represent areas with over 200 waste particles.

[0043] For example, the image processing unit 62 extracts pixels with brightness values ​​higher than a predetermined value from the image captured by the camera 61, and extracts the densely populated area of ​​the extracted pixels as an extraction region A. Furthermore, the image processing unit 62 calculates the centroid position Pc of the brightness values ​​of the extraction region A based on the brightness values ​​of all pixels contained in the extraction region A.

[0044] exist Figure 3 and Figure 4 In the diagram, axis X is a straight line extending parallel to the transfer direction TD, and axis Y is a straight line extending parallel to the width direction WD, which is orthogonal to the transfer direction TD. Figure 3 The positions P0, P1, P2, P3, P4, and Pc shown represent positions on the XY plane defined by axes X and Y, respectively. The position on axis Y for positions P0, P1, and P2 is Y0, and the position on axis X for positions P0, P3, and P4 is X0. Position P1 is the midpoint between positions P0 and P2. Position P3 is the midpoint between positions P0 and P4. For position P5, its position on axis X is X1, which is the same as position P1, and its position on axis Y is Y1, which is the same as position P3.

[0045] The image processing unit 62 calculates the centroid position Pc, determines the position on the X-axis as Xc, and the position on the Y-axis as Yc. Then, the image processing unit 62 determines a region R centered on the centroid position Pc(Xc, Yc). Region R has a first defined region r1 in the X-axis direction and a second defined region r2 in the Y-axis direction.

[0046] The region R, determined based on the centroid position Pc of the brightness value of the extracted region A, represents the region where the flame is generated most frequently. This flame is formed by the combustion of volatile gases generated from the waste 200. The first defined region r1 detected by the image processing unit 62 represents the distribution state (first distribution state) of the unburned waste 200 in the transport direction TD. Furthermore, the second defined region r2 detected by the image processing unit 62 represents the distribution state (second distribution state) of the unburned waste 200 in the width direction WD.

[0047] The distribution pattern shown in region R indicates a combustion state where the oxygen concentration is higher than in other regions, and the volatile components (e.g., CH4, CO) generated from waste 200 are also higher than in other regions. Furthermore, since the oxygen concentration in region R is higher than in other regions, the distribution pattern shown in region R indicates a combustion state where the nitrogen oxide concentration is higher than in other regions.

[0048] 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 conveying direction TD and the distribution state of the unburned waste 200 in the width direction WD based on the image obtained by the camera 61 from above the grate 30 of the waste 200 and the state of the flame, but other solutions are also possible.

[0049] For example, the distribution state detection sensor 60 can also detect the temperature distribution along the conveying direction TD as the distribution state along the conveying direction TD. Specifically, the distribution state detection sensor 60 can also obtain the temperature distribution along the conveying direction TD from multiple temperature sensors (not shown) arranged above the grate 30 along the conveying direction TD, and detect the area with the highest temperature as the first defined area r1. In this case, the distribution state shown in the first defined area r1 indicates a combustion state with a higher temperature than other areas.

[0050] Furthermore, the distribution state detection sensor 60 can also detect the temperature distribution along the width direction WD as the distribution state along the width direction WD. Specifically, the distribution state detection sensor 60 can also obtain the temperature distribution along the width direction WD from multiple temperature sensors (not shown) arranged above the grate 30 along the width direction WD, and detect the area with the highest temperature as the second specified area r2.

[0051] Furthermore, the distribution state detection sensor 60 can also use a laser CT instead of a temperature sensor to detect the gas composition distribution in the transport direction TD as the distribution state in the transport 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 the area with a large amount of a specified gas, indicating the presence of a large amount of unburned waste 200, as the first specified area r1 and the second specified area r2.

[0052] 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 composed, for example, of a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), and a computer-readable storage medium. Furthermore, as an example, a series of processes for implementing various functions are stored in the form of a program on a storage medium, etc. The CPU reads this program into RAM, etc., and performs information processing and arithmetic operations, thereby realizing various functions.

[0053] The control unit 70 controls the primary air supply unit 40 based on the distribution state of the transport direction TD detected by the distribution state detection sensor 60, so as to supply more combustion air to the first designated area r1, which has more unburned waste 200 than other areas in the transport direction TD.

[0054] exist Figure 3 In the example shown, the control unit 70 controls the primary air supply unit 40 so that the first flow rate of combustion air supplied from the primary air supply ports 41b and 41c located near the first designated region r1 is greater than the second flow rate of combustion air supplied from the primary air supply ports 41a, 41d and 41e located near other regions.

[0055] Figure 3 The regions ra, rb, rc, rd, and re shown along axis X represent the regions where primary air supply ports 41a, 41b, 41c, 41d, and 41e are configured in the transport direction TD, respectively. Figure 3 In the image processing unit 62, a region including region rb and region rc is detected as a first defined region r1.

[0056] By making the first flow rate of combustion air supplied from the primary air supply ports 41b and 41c that supply primary air to regions rb and rc greater than the second flow rate of combustion air supplied from the primary air supply ports 41a, 41d and 41e located near other regions, the combustion of waste 200 present in regions rb and rc can be promoted.

[0057] On the other hand, Figure 4 In the example shown, the control unit 70 controls the primary air supply unit 40 so that the first flow rate of combustion air supplied from the primary air supply ports 41c and 41d located near the first designated region r1 is greater than the second flow rate of combustion air supplied from the primary air supply ports 41a, 41b and 41e located near other regions.

[0058] exist Figure 4 In the image processing unit 62, the region including region rc and region rd is detected as a first designated region r1. By making the first flow rate of combustion air supplied from the primary air supply ports 41c and 41d that supply primary air to region rc and region rd greater than the second flow rate of combustion air supplied from the primary air supply ports 41a, 41b and 41e located near other regions, the combustion of waste 200 present in region rc and region rd can be promoted.

[0059] Furthermore, the control unit 70 controls the secondary air supply unit 50 based on the distribution state of the transport direction TD detected by the distribution state detection sensor 60, so as to supply more combustion air to the first designated area r1, which has more unburned waste 200 than other areas in the transport direction TD.

[0060] exist Figure 3 In the example shown, since the first specified region r1 exists in the transfer direction TD at a position closer to the upstream air supply port 51 than the downstream air supply port 52, the control unit 70 controls the secondary air supply unit 50 so that the flow rate of combustion air supplied from the downstream air supply port 52 is greater than the flow rate of combustion air supplied from the upstream air supply port 51.

[0061] More specifically, the control unit 70 controls the dampers 53 and 54 so that the position of the combustion air supplied from the upstream air supply port 51 and the combustion air supplied from the downstream air supply port 52 in the transfer direction TD is consistent with the position Xc on the axis X of the center of gravity position Pc.

[0062] exist Figure 3In the example shown, the flow rate of combustion air supplied from the downstream air supply port 52 is greater than the flow rate of combustion air supplied from the upstream air supply port 51, which is located further away from the center of gravity position Pc in the transport direction TD. This allows a flame near the center of gravity position Pc to be introduced downstream in the transport direction TD, ensuring sufficient residence time for volatile gases and promoting mixing of the volatile gases near the center of gravity position Pc with those downstream.

[0063] In addition, Figure 3 In the example shown, the flow rate of combustion air supplied from the upstream air supply port 51 is less than the flow rate of combustion air supplied from the downstream air supply port 52, which is closer to the center of gravity Pc in the transport direction TD. By reducing the penetrating force of the combustion air supplied from the upstream air supply port 51, a high oxygen concentration can be maintained near the upstream air supply port 51, thus preventing unburned volatile gases from being guided upwards in an unburned state.

[0064] exist Figure 4 In the example shown, since the first specified region r1 exists in the transfer direction TD at a position closer to the downstream air supply port 52 than the upstream air supply port 51, the control unit 70 controls the secondary air supply unit 50 so that the flow rate of combustion air supplied from the upstream air supply port 51 is greater than the flow rate of combustion air supplied from the downstream air supply port 52.

[0065] More specifically, the control unit 70 controls the dampers 53 and 54 so that the position of the combustion air supplied from the upstream air supply port 51 and the combustion air supplied from the downstream air supply port 52 in the transfer direction TD is consistent with the position Xc on the axis X of the center of gravity position Pc.

[0066] Furthermore, the control unit 70 controls the secondary air supply unit 50 based on the distribution state of the width direction WD detected by the distribution state detection sensor 60, so as to supply more combustion air to the second designated area r2, which has more unburned waste 200 than other areas in the width direction WD.

[0067] Figure 3 The regions rf, rg, and rh along axis Y represent the regions where upstream air supply ports 51a, 51b, and 51c are configured in the width direction WD, respectively. Similarly, regions rf, rg, and rh represent the regions where downstream air supply ports 52a, 52b, and 52c are configured in the width direction WD, respectively. Figure 3In the image processing unit 62, a region including region rf and region rg is detected as a second defined region r2.

[0068] exist Figure 3 In the image processing unit 62, the region containing region rf and region rg is detected as the second defined region r2. Therefore, in Figure 3 In the example shown, the control unit 70 controls the damper 53 to ensure that the amount of combustion air supplied from the upstream air supply ports 51a and 51b is greater than the amount of combustion air supplied from the upstream air supply port 51c. Furthermore, in Figure 3 In the example shown, the control unit 70 controls the damper 54 so that the amount of combustion air supplied from the downstream air supply ports 52a and 52b is greater than the amount of combustion air supplied from the downstream air supply port 52c.

[0069] The heat recovery boiler 80 is a device that uses combustion gases generated in the incinerator body 10 to produce steam. The combustion gases generated in the incinerator body 10 exchange heat with water flowing in multiple heat transfer tubes (not shown) installed in the heat recovery boiler 80. The combustion gases that have completed heat exchange with the water flowing in the heat transfer tubes are guided from the heat recovery boiler 80 to the cooling tower 85.

[0070] Cooling tower 85 is a device for reducing the temperature of combustion gases drawn from heat recovery boiler 80. Cooling tower 85 reduces the temperature of combustion gases, for example, by spraying water in a mist onto the combustion gases. The combustion gases, now cooled by cooling tower 85, are then directed to dust collection device 90.

[0071] The dust collection device 90 is a device for removing coal dust contained in the combustion gas guided from the cooling tower 85. The combustion gas, after the coal dust has been removed by the dust collection device 90, is guided to the chimney 95 and discharged into the atmosphere.

[0072] Next, refer to Figure 5 The control method of the grate incinerator 100 in this embodiment will be described. Figure 5 This is a flowchart illustrating a control method for a grate incinerator 100 according to one embodiment of the present disclosure.

[0073] In step S101 (detection process), the distribution state detection sensor 60 detects the distribution state of the unburned waste 200 transferred by the grate 30 in the transfer direction TD and the width direction WD. The distribution state detection sensor 60 transmits the detected distribution state in the transfer direction TD and the width direction WD to the control unit 70.

[0074] Specifically, the distribution state detection sensor 60 detects the first predetermined area r1 where the flame is generated most frequently as the distribution state in the transfer direction TD, and this flame is generated by the combustion of volatile gases generated from the waste 200. Furthermore, the distribution state detection sensor 60 detects the second predetermined area r2 where the flame is generated most frequently as the distribution state in the width direction WD, and this flame is generated by the combustion of volatile gases generated from the waste 200.

[0075] In step S102 (control process), the control unit 70 controls the primary air supply unit 40 based on the distribution state on the transport direction TD detected in step S101, so as to supply more combustion air to the first designated area r1, which has more unburned waste 200 than other areas on the transport direction TD.

[0076] Specifically, the control unit 70 controls the primary air supply unit 40 such that the first flow rate of combustion air supplied from the primary air supply port (at least one of primary air supply ports 41a, 41b, 41c, 41d, 41e) located near the first designated region r1 is greater than the second flow rate of combustion air supplied from the primary air supply port (at least one of primary air supply ports 41a, 41b, 41c, 41d, 41e) located near other regions.

[0077] Furthermore, in step S102 (control process), the control unit 70 controls the secondary air supply unit 50 based on the distribution state in the width direction WD detected by step S101, so as to supply more combustion air than other regions to the second designated region r2, which has more unburned waste 200 than other regions in the width direction WD.

[0078] Specifically, the control unit 70 controls the damper 53 so that the amount of combustion air supplied from the upstream air supply port 51 (at least one of the upstream air supply ports 51a, 51b, and 51c) located near the second designated region r2 is greater than the amount of combustion air supplied from the upstream air supply ports (at least one of the upstream air supply ports 51a, 51b, and 51c) located in other regions.

[0079] Similarly, the control unit 70 controls the damper 54 so that the amount of combustion air supplied from the downstream air supply port 52 (at least one of the downstream air supply ports 52a, 52b, and 52c) located near the second designated region r2 is greater than the amount of combustion air supplied from the downstream air supply ports (any one of the downstream air supply ports 52a, 52b, and 52c) located in other regions.

[0080] In step S103 (control process), the control unit 70 controls the secondary air supply unit 50 based on the distribution state on the transport direction TD detected in step S101, so as to supply more combustion air to the first designated area r1, which has more unburned waste 200 than other areas on the transport direction TD.

[0081] Specifically, the control unit 70 controls the damper 53 and damper 54 so that the position of the combustion air supplied from the upstream air supply port 51 and the combustion air supplied from the downstream air supply port 52 in the transfer direction TD is consistent with the first predetermined area r1.

[0082] In step S104, the control unit 70 determines whether to end the process of detecting the distribution of unburned waste 200 in the transfer direction TD and the width direction WD of the waste 200 transferred by the grate 30. If the determination is no, the control unit 70 executes the processes of steps S101 to S103 again; if the determination is yes, the control unit 70 ends the process of this flowchart.

[0083] The function and effect of the grate incinerator 100 of this embodiment described above will be explained.

[0084] According to the grate incinerator 100 of this embodiment, the distribution state of unburned waste 200 supplied to the incinerator body 10 by the waste supply unit 20 and transferred by the grate 30 is detected by the distribution state detection sensor 60 along the transfer direction TD. Furthermore, based on the distribution state of the unburned waste 200 along the transfer direction TD 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 to supply more combustion air than other areas to a first predetermined area r1 where there is more unburned waste 200 than in other areas along the transfer direction TD.

[0085] Compared to other areas, this design promotes the combustion of unburned waste 200 within the first designated area r1. Therefore, the combustion state in each area of ​​the waste 200's transport direction TD can be appropriately controlled to ensure complete combustion of the waste 200, based on the distribution of the unburned waste 200 along its transport direction TD. Because the supply of combustion air along the transport direction TD is appropriately controlled, the generation of CO due to insufficient local air and the generation of NOx due to excessive local air can be suppressed.

[0086] Furthermore, the grate incinerator 100 according to this embodiment can detect the distribution of unburned waste 200 in the width direction WD, which is orthogonal to the conveying direction TD, and appropriately control the combustion state of each area of ​​the waste 200 in the width direction WD in a manner that ensures complete combustion of the waste 200. Since the supply of combustion air in the width direction WD is appropriately controlled, the generation of CO due to insufficient local air and the generation of NOx due to excessive local air can be suppressed.

[0087] Furthermore, according to the grate incinerator 100 of this embodiment, if a first predetermined region r1 containing more unburned waste 200 than other regions exists in the conveying direction TD and is located closer to the downstream air supply port 52 than the upstream air supply port 51 in the conveying direction TD, the secondary air supply unit 50 is controlled so that the first flow rate of combustion air supplied from the upstream air supply port 51 is greater than the second flow rate of combustion air supplied from the downstream air supply port 52.

[0088] By making the first flow rate greater than the second flow rate, the point where the combustion air supplied from the upstream air supply port 51 and the combustion air supplied from the downstream air supply port 52 merges is closer to the downstream air supply port 52 than the midpoint between the upstream and downstream air supply ports 51. Therefore, supplying more combustion air to the first designated area r1 than to other areas promotes the combustion of unburned waste 200 within the first designated area r1.

[0089] Furthermore, by making the first flow rate greater than the second flow rate, unburned volatile gases present near the first designated area r1 are attracted by the flow of combustion air introduced into the incinerator body 10 from the upstream air supply port 51, and move from the first designated area r1 towards the upstream air supply port 51. As a result, the volatile gases generated from the waste 200 are dispersed along the conveying direction TD, which can promote the combustion of the waste 200 over a wide area of ​​the incinerator body 10.

[0090] According to the grate incinerator 100 of this embodiment, the primary air supply unit 40 is controlled such that the first flow rate of combustion air supplied from a primary air supply port located near a first designated region r1 is greater than the second flow rate of combustion air supplied from a primary air supply port located near other regions. This first designated region r1 contains more unburned waste 200 than other regions in the transport direction TD. By supplying more combustion air to the first designated region r1 than to other regions through a first flow rate greater than the second flow rate, combustion of the unburned waste 200 within the first designated region r1 can be promoted.

[0091] The combustion furnace described in the above-described embodiments is understood for example as follows.

[0092] The combustion furnace disclosed herein is a combustion furnace (100) that ignites a combustor while moving it along a transfer direction. The combustion furnace (100) comprises: a combustion furnace body (10) for igniting the combustor; a combustor supply unit (20) for supplying the combustor to the combustion furnace body; a transfer unit (30) disposed on the combustion furnace body (10) and for transferring the combustor supplied to the combustion furnace body by the combustor supply unit in the transfer direction; an air supply unit (40, 50) for supplying combustion air to the combustion furnace body; a detection unit (60) for detecting the distribution state of unburned combustors transferred by the transfer unit in the transfer direction; and a control unit (70) for controlling the air supply unit based on the distribution state detected by the detection unit, so as to supply more combustion air than other regions to a first predetermined region in the transfer direction where there are more unburned combustors than in other regions.

[0093] According to the combustion furnace of this disclosure, a detection unit detects the distribution of unburned combustibles supplied to the combustion furnace body by the combustibles supply unit and transferred by the transfer unit in the transfer direction. Furthermore, based on the distribution of unburned combustibles in the transfer direction detected by the detection unit, a control unit controls the air supply unit to supply more combustion air than other regions to a first predetermined region (r1) where more unburned combustibles exist in the transfer direction than in other regions.

[0094] Compared to other areas, it promotes the combustion of unburned combustibles in the first designated area. Therefore, the combustion state in each area along the transport direction of the combustibles can be appropriately controlled to ensure complete combustion, based on the distribution of the unburned combustibles in the transport direction. Because the supply of combustion air in the transport direction is appropriately controlled, the generation of CO due to localized insufficient air and the generation of NOx due to localized excessive air can be suppressed.

[0095] In the combustion furnace disclosed herein, the following configuration may also be adopted, wherein the detection unit detects the distribution state based on an image of the object to be burned taken from above the transfer unit.

[0096] According to the combustion furnace of this configuration, the distribution state can be detected based on an image of the object to be burned taken from above the transfer section, so as to appropriately control the combustion state in each area of ​​the transfer direction of the object to be burned in a way that ensures complete combustion of the object.

[0097] In the combustion furnace disclosed herein, the following configuration may also be adopted, wherein the detection unit detects the distribution state based on the temperature distribution in the conveying direction.

[0098] According to the combustion furnace of this configuration, the distribution state can be detected based on the temperature distribution in the conveying direction, so as to appropriately control the combustion state in each region of the conveying direction of the combustor in a way that ensures complete combustion of the combustor.

[0099] In the combustion furnace disclosed herein, the following configuration may also be adopted: the detection unit detects the distribution state of the unburned combusted material in the width direction orthogonal to the transfer direction, and the control unit controls the air supply unit based on the distribution state in the width direction detected by the detection unit, so as to supply more combustion air to a second predetermined area (r2) in the width direction where there is more unburned combusted material than in other areas.

[0100] According to the combustion furnace of this configuration, the distribution of unburned combustibles in the width direction orthogonal to the conveying direction can be detected, and the combustion state in each region of the combustibles in the width direction can be appropriately controlled in a way that ensures complete combustion of the combustibles. Since the supply of combustion air in the width direction is appropriately controlled, the generation of CO due to local air deficiency and the generation of NOx due to local air excess can be suppressed.

[0101] In the combustion furnace disclosed herein, the following configuration may also be adopted, wherein the air supply unit has: an upstream air supply port (51) disposed above the transfer unit, which supplies combustion air from the upstream side to the downstream side in the transfer direction; and a downstream air supply port (52) disposed above the transfer unit, which supplies combustion air from the downstream side to the upstream side in the transfer direction. The upstream air supply port is disposed opposite to the downstream air supply port at a position closer to the upstream side in the transfer direction than 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, the control unit controls the air supply unit to make the first flow rate of the combustion air supplied from the upstream air supply port greater than the second flow rate of the combustion air supplied from the downstream air supply port.

[0102] According to the combustion furnace of this configuration, when a first predetermined area containing more unburned combustible material than other areas exists in the conveying direction and is located closer to the downstream air supply port than the upstream air supply port in the conveying direction, the air supply unit is controlled so that the first flow rate of combustion air supplied from the upstream air supply port is greater than the second flow rate of combustion air supplied from the downstream air supply port.

[0103] By making the first flow rate greater than the second flow rate, the point where the combustion air supplied from the upstream air supply port and the combustion air supplied from the downstream air supply port merge is closer to the downstream air supply port than the midpoint between the upstream and downstream air supply ports. Therefore, supplying more combustion air to the first designated area than to other areas promotes the combustion of unburned materials within the first designated area.

[0104] Furthermore, by making the first flow rate greater than the second flow rate, unburned volatile gases present near the first designated area are attracted by the flow of combustion air introduced into the combustion furnace body from the upstream air supply port, and move from the first designated area towards the upstream air supply port side. As a result, the volatile gases generated from the combusted material are dispersed along the conveying direction, promoting the combustion of the combusted material over a wide area of ​​the combustion furnace body.

[0105] In the combustion furnace disclosed herein, the following configuration may also be adopted, wherein the air supply unit has: an upstream air supply port (51) disposed above the transfer unit, which supplies combustion air from the upstream side to the downstream side in the transfer direction; and a downstream air supply port (52) disposed above the transfer unit, which supplies combustion air from the downstream side to the upstream side in the transfer direction. The upstream air supply port is disposed opposite to the downstream air supply port at a position closer to the upstream side in the transfer direction than the downstream air supply port. When the first predetermined region exists at a position closer to the upstream air supply port than the downstream air supply port in the transfer direction, the control unit controls the air supply unit to make the first flow rate of the combustion air supplied from the downstream air supply port greater than the second flow rate of the combustion air supplied from the upstream air supply port.

[0106] According to the combustion furnace of this configuration, when a first predetermined area containing more unburned combustible material than other areas exists in the conveying direction and is located closer to the upstream air supply port than the downstream air supply port in the conveying direction, the air supply unit is controlled so that the first flow rate of combustion air supplied from the downstream air supply port is greater than the second flow rate of combustion air supplied from the upstream air supply port.

[0107] By making the first flow rate greater than the second flow rate, the point where the combustion air supplied from the downstream air supply port and the combustion air supplied from the upstream air supply port merge is closer to the upstream air supply port than the midpoint between the downstream and upstream air supply ports. Therefore, supplying more combustion air to the first designated area than to other areas promotes the combustion of unburned materials within the first designated area.

[0108] Furthermore, by making the first flow rate greater than the second flow rate, unburned volatile gases present near the first designated area are attracted by the flow of combustion air introduced into the combustion furnace body from the downstream air supply port, and move from the first designated area to the downstream air supply port side. As a result, the volatile gases generated from the combusted material are dispersed along the conveying direction, which can promote the combustion of the combusted material over a wide area of ​​the combustion furnace body.

[0109] In the combustion furnace disclosed herein, the following configuration may also be adopted, wherein the air supply unit has: a plurality of primary air supply ports (41a to 41e) for supplying combustion air to the combusted material conveyed by the transfer unit from below the transfer unit, the plurality of primary air supply ports being arranged along the transfer direction, and the control unit controlling the air supply unit such that a first flow rate of the combustion air supplied from the primary air supply port located near the first predetermined area is greater than a second flow rate of the combustion air supplied from the primary air supply port located near the other areas.

[0110] According to the combustion furnace of this configuration, the air supply unit is controlled such that a first flow rate of combustion air supplied from a primary air supply port located near a first predetermined region is greater than a second flow rate of combustion air supplied from a primary air supply port located near other regions, wherein the first predetermined region contains more unburned combustible material than other regions in the transport direction. By supplying more combustion air to the first predetermined region than to other regions through a first flow rate greater than the second flow rate, combustion of the unburned combustible material in the first predetermined region can be promoted.

[0111] The control method of the combustion furnace described in the above-described embodiments can be understood as follows.

[0112] The present disclosure discloses a combustion furnace control method that controls a combustion furnace by simultaneously moving a combustible material along a transfer direction and igniting the combustible material. The combustion furnace comprises: a combustion furnace body for igniting the combustible material; a combustible material supply unit for supplying the combustible material to the combustion furnace body; a transfer unit disposed on the combustion furnace body and for moving the combustible material supplied to the combustion furnace body by the combustible material supply unit in the transfer direction; and an air supply unit for supplying combustion air to the combustion furnace body. The combustion furnace control method comprises: a detection process for detecting the distribution state of unburned combustible material moved by the transfer unit in the transfer direction; and a control process for controlling the air supply unit based on the distribution state detected by the detection process, so as to supply more combustion air than other regions to a first predetermined region in the transfer direction where there are more unburned combustible material than in other regions.

[0113] According to the combustion furnace of this disclosure, the distribution of unburned combustibles supplied to the combustion furnace body by the combustibles supply unit and transferred by the transfer unit in the transfer direction is detected by a detection process. Furthermore, based on the distribution of unburned combustibles in the transfer direction detected by the detection process, the air supply unit is controlled during the control process to supply more combustion air than other areas to a first predetermined area where there is more unburned combustibles in the transfer direction than in other areas.

[0114] Compared to other areas, it promotes the combustion of unburned combustibles in the first designated area. Therefore, the combustion state in each area along the transport direction of the combustibles can be appropriately controlled to ensure complete combustion, based on the distribution of the unburned combustibles in the transport direction. Because the supply of combustion air in the transport direction is appropriately controlled, the generation of CO due to localized insufficient air and the generation of NOx due to localized excessive air can be suppressed.

[0115] In the control method of the combustion furnace disclosed herein, the following configuration may also be adopted, namely, during the detection process, the distribution state is detected based on an image of the object to be burned taken from above the transfer unit.

[0116] According to the control method of the combustion furnace of this configuration, the distribution state can be detected based on the image of the object to be burned taken from above the transfer section, so as to appropriately control the combustion state in each area of ​​the transfer direction of the object to be burned in a way that ensures complete combustion of the object to be burned.

[0117] In the control method of the combustion furnace disclosed herein, the following configuration may also be adopted: during the detection process, the temperature distribution in the conveying direction is detected as the distribution state.

[0118] According to the control method of the combustion furnace of this configuration, the temperature distribution in the conveying direction can be detected as the distribution state, so as to appropriately control the combustion state in each region of the conveying direction of the combustor in a way that ensures complete combustion of the combustor.

[0119] In the control method of the combustion furnace disclosed herein, the following configuration may also be adopted: during the detection process, the distribution state of the unburned combusted material in the width direction orthogonal to the transfer direction is detected; during the control process, the air supply unit is controlled based on the distribution state in the width direction detected by the detection process, so as to supply more combustion air to a second predetermined area in the width direction where there is more unburned combusted material than in other areas.

[0120] According to the control method of the combustion furnace of this configuration, the distribution of unburned combustibles in the width direction orthogonal to the conveying direction can be detected, and the combustion state in each region of the combustibles in the width direction can be appropriately controlled in a way that ensures complete combustion of the combustibles. Since the supply of combustion air in the width direction is appropriately controlled, the generation of CO due to local air deficiency and the generation of NOx due to local air excess can be suppressed.

[0121] In the control method of the combustion furnace disclosed herein, the following configuration may also be adopted: the air supply unit has: an upstream air supply port disposed above the transfer unit, which supplies combustion air from the upstream side to the downstream side in the transfer direction; and a downstream air supply port disposed above the transfer unit, which supplies combustion air from the downstream side to the upstream side in the transfer direction. The upstream air supply port is disposed opposite to the downstream air supply port at a position closer to the upstream side in the transfer direction than the downstream air supply port. During the control process, if 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, 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.

[0122] According to the control method of the combustion furnace of this configuration, when a first predetermined area containing more unburned combustible material than other areas exists in the conveying direction and is located closer to the downstream air supply port than the upstream air supply port in the conveying direction, the air supply unit is controlled so that the first flow rate of combustion air supplied from the upstream air supply port is greater than the second flow rate of combustion air supplied from the downstream air supply port.

[0123] By making the first flow rate greater than the second flow rate, the point where the combustion air supplied from the upstream air supply port and the combustion air supplied from the downstream air supply port merge is closer to the downstream air supply port than the midpoint between the upstream and downstream air supply ports. Therefore, supplying more combustion air to the first designated area than to other areas promotes the combustion of unburned materials within the first designated area.

[0124] Furthermore, by making the first flow rate greater than the second flow rate, unburned volatile gases present near the first designated area are attracted by the flow of combustion air introduced into the combustion furnace body from the upstream air supply port, and move from the first designated area towards the upstream air supply port side. As a result, the volatile gases generated from the combusted material are dispersed along the conveying direction, promoting the combustion of the combusted material over a wide area of ​​the combustion furnace body.

[0125] In the control method of the combustion furnace disclosed herein, the following configuration may also be adopted: the air supply unit has: an upstream air supply port disposed above the transfer unit, which supplies combustion air from the upstream side to the downstream side in the transfer direction; and a downstream air supply port disposed above the transfer unit, which supplies combustion air from the downstream side to the upstream side in the transfer direction. The upstream air supply port is disposed opposite to the downstream air supply port at a position closer to the upstream side in the transfer direction than the downstream air supply port. During the control process, if the first predetermined region exists at a position closer to the upstream air supply port than the downstream air supply port in the transfer direction, the air supply unit is controlled 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.

[0126] According to the control method of the combustion furnace of this configuration, when a first predetermined area containing more unburned combustible material than other areas exists in the conveying direction and is located closer to the upstream air supply port than the downstream air supply port in the conveying direction, the air supply unit is controlled so that the first flow rate of combustion air supplied from the downstream air supply port is greater than the second flow rate of combustion air supplied from the upstream air supply port.

[0127] By making the first flow rate greater than the second flow rate, the point where the combustion air supplied from the downstream air supply port and the combustion air supplied from the upstream air supply port merge is closer to the upstream air supply port than the midpoint between the downstream and upstream air supply ports. Therefore, supplying more combustion air to the first designated area than to other areas promotes the combustion of unburned materials within the first designated area.

[0128] Furthermore, by making the first flow rate greater than the second flow rate, unburned volatile gases present near the first designated area are attracted by the flow of combustion air introduced into the combustion furnace body from the downstream air supply port, and move from the first designated area to the downstream air supply port side. As a result, the volatile gases generated from the combusted material are dispersed along the conveying direction, which can promote the combustion of the combusted material over a wide area of ​​the combustion furnace body.

[0129] In the control method of the combustion furnace disclosed herein, the following configuration may also be adopted: the air supply unit has a plurality of primary air supply ports for supplying combustion air from below the transfer unit to the combusted material transferred by the transfer unit; the plurality of primary air supply ports are arranged along the transfer direction; and during the control process, the air supply unit is controlled such that a first flow rate of the combustion air supplied from the primary air supply port located near the first predetermined area is greater than a second flow rate of the combustion air supplied from the primary air supply port located near the other areas.

[0130] According to the control method of the combustion furnace of this configuration, the air supply unit is controlled such that a first flow rate of combustion air supplied from a primary air supply port located near a first predetermined region is greater than a second flow rate of combustion air supplied from a primary air supply port located near other regions, wherein the first predetermined region contains more unburned combustible material than other regions in the transport direction. By supplying more combustion air to the first predetermined region than to other regions by making the first flow rate greater than the second flow rate, combustion of the unburned combustible material in the first predetermined region can be promoted.

[0131] Explanation of reference numerals in the attached figures

[0132] 10: Incinerator body (combustion furnace body);

[0133] 20: Waste Supply Department (Incinerated Material Supply Department);

[0134] 21: Feed into the hopper;

[0135] 22: Feeder;

[0136] 30: Grate (transfer section);

[0137] 40: Primary air supply unit;

[0138] 41a, 41b, 41c, 41d, 41e: Primary air supply ports;

[0139] 42a, 42b, 42c, 42d, 42e: Air dampers;

[0140] 43: Blower;

[0141] 50: Secondary air supply unit;

[0142] 51: Upstream air supply port;

[0143] 52: Downstream air supply port;

[0144] 53, 54: Air damper;

[0145] 55: Blower;

[0146] 60: Distribution state detection sensor;

[0147] 61: Camera;

[0148] 62: Image Processing Unit;

[0149] 70: Control Department;

[0150] 80: Heat recovery boiler;

[0151] 85: Cooling tower;

[0152] 90: Dust collection device;

[0153] 95: Chimney;

[0154] 100: Grate incinerator (combustion furnace);

[0155] 200: Waste;

[0156] A: Extraction region;

[0157] Pc: Center of gravity position;

[0158] R: Region;

[0159] TD: Transfer direction;

[0160] WD: Width direction;

[0161] r1: First defined region;

[0162] r2: Second specified area.

Claims

1. A combustion furnace that combusts a combustible while conveying the combustible in a conveyance direction, wherein the combustion furnace comprises: a combustion furnace main body that combusts the combustible; a combustible supply portion that supplies the combustible to the combustion furnace main body; a conveyance portion that is provided to the combustion furnace main body and conveys the combustible supplied to the combustion furnace main body by the combustible supply portion in the conveyance direction; an air supply portion that supplies combustion air to the combustion furnace main body; a detection portion that detects a distribution state of uncombusted combustible in the conveyance direction conveyed by the conveyance portion; and a control portion that controls the air supply portion so as to supply more combustion air to a first prescribed region in which more uncombusted combustible exists than in other regions in the conveyance direction, based on the distribution state detected by the detection portion, the detection portion detects the distribution state based on an image of a state of the combustible and a flame of combustion of a volatile gas volatilized from the combustible taken from above the conveyance portion, the air supply portion has: an upstream side air supply port that is disposed above the conveyance portion and supplies the combustion air from an upstream side to a downstream side in the conveyance direction; and a downstream side air supply port that is disposed above the conveyance portion and supplies the combustion air from a downstream side to an upstream side in the conveyance direction, the upstream side air supply port is disposed at a position on the upstream side in the conveyance direction from the downstream side air supply port in an opposed manner to the downstream side air supply port, in a case where the first prescribed region exists at a position closer to the downstream side air supply port than the upstream side air supply port in the conveyance direction, the control portion controls the air supply portion so that a first flow rate of the combustion air supplied from the upstream side air supply port is more than a second flow rate of the combustion air supplied from the downstream side air supply port, whereby uncombusted volatile gas existing in the vicinity of the first prescribed region and the flame are drawn by a flow of the combustion air supplied from the upstream side air supply port to the combustion furnace main body and move from the first prescribed region to the upstream side air supply port side.

2. The combustion furnace according to claim 1, wherein the detection portion detects the distribution state based on a temperature distribution in the conveyance direction.

3. The combustion furnace according to claim 1 or 2, wherein the detection portion detects the distribution state of uncombusted combustible in a width direction orthogonal to the conveyance direction, the control portion controls the air supply portion so as to supply more combustion air to a second prescribed region in which more uncombusted combustible exists than in other regions in the width direction, based on the distribution state in the width direction detected by the detection portion.

4. The combustion furnace according to claim 1 or 2, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ In a case where the first prescribed region exists at a position closer to the upstream-side air supply port than the downstream-side air supply port in the conveyance direction, the control section controls the air supply section so that the first flow rate of the combustion air supplied from the downstream-side air supply port is larger than the second flow rate of the combustion air supplied from the upstream-side air supply port.

5. The combustion furnace according to claim 1 or 2, wherein the air supply section has a plurality of primary air supply ports that supply the combustion air to the combustibles conveyed by the conveyance section from the lower direction of the conveyance section, the plurality of primary air supply ports are arranged along the conveyance direction, the control section controls the air supply section so that a first flow rate of the combustion air supplied from the primary air supply port arranged at a position closer to the first prescribed region is larger than a second flow rate of the combustion air supplied from the primary air supply port arranged at a position closer to the other region.

6. A control method of a combustion furnace that conveys combustibles along a conveyance direction while combusting the combustibles, wherein the combustion furnace includes: a combustion furnace main body that combusts the combustibles; a combustible supply section that supplies the combustibles to the combustion furnace main body; a conveyance section that is provided to the combustion furnace main body and conveys the combustibles supplied to the combustion furnace main body by the combustible supply section in the conveyance direction; and an air supply section that supplies combustion air to the combustion furnace main body, the control method of the combustion furnace includes: a detection process that detects a distribution state of uncombusted combustibles conveyed by the conveyance section in the conveyance direction; and a control process that controls the air supply section so as to supply more combustion air to a first prescribed region in which more uncombusted combustibles exist than in other regions in the conveyance direction, based on the distribution state detected by the detection process, in the detection process, the distribution state is detected based on an image of a state in which the combustibles and a flame of combustion of a volatile gas volatilized from the combustibles are photographed from above the conveyance section, the air supply section has: an upstream-side air supply port arranged above the conveyance section and supplying the combustion air from an upstream side to a downstream side in the conveyance direction; and a downstream-side air supply port arranged above the conveyance section and supplying the combustion air from a downstream side to an upstream side in the conveyance direction, the upstream-side air supply port is arranged at a position upstream of the downstream-side air supply port in the conveyance direction in an opposed manner to the downstream-side air supply port, ​ In the control process, in a case where the first prescribed region exists at a position closer to the upstream-side air supply port than to the downstream-side air supply port in the conveyance direction, the air supply portion 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, whereby the unburned volatile gas existing in the vicinity of the first prescribed region and the flame are drawn by the flow of the combustion air projected from the upstream-side air supply port toward the combustion furnace main body, and move from the first prescribed region toward the upstream-side air supply port side.

7. The combustion furnace control method according to claim 6, wherein In the detection process, the temperature distribution in the conveyance direction is detected as the distribution state.

8. The combustion furnace control method according to claim 6 or 7, wherein In the detection process, the distribution state of the unburned combustible in a width direction orthogonal to the conveyance direction is detected, In the control process, the air supply portion is controlled on the basis of the distribution state in the width direction detected by the detection process so as to supply the combustion air in a larger amount to a second prescribed region in which the unburned combustible exists in a larger amount than in other regions in the width direction.

9. The combustion furnace control method according to claim 6 or 7, wherein In the control process, in a case where the first prescribed region exists at a position closer to the upstream-side air supply port than to the downstream-side air supply port in the conveyance direction, the air supply portion 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.

10. The combustion furnace control method according to claim 6 or 7, wherein The air supply portion has a plurality of primary air supply ports that supply the combustion air to the combustible conveyed by the conveyance portion from a lower direction of the conveyance portion, The plurality of primary air supply ports are arranged along the conveyance direction, In the control process, 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 closer to the first prescribed region is larger than a second flow rate of the combustion air supplied from the primary air supply port arranged at a position closer to the other region.

Images