Combustion equipment control devices, combustion equipment control methods and procedures products

Abstract

The present invention provides a control device for a combustion device, the combustion device comprising: a furnace body defining a processing space; a grate conveying a substance to be burned along a conveying direction in the processing space; and an air box supplying air to the processing space. The control device comprises: an image acquisition unit acquiring a processing image of a segment of the processing space divided along the conveying direction; a point determination unit determining, based on the processing image, the end of the flame generated by the combustion of the substance in the conveying direction, i.e., the burnout point; a first speed calculation unit calculating a speed correction value of the grate in the segment, i.e., a first speed correction value, based on the burnout point; and a speed control unit controlling the speed of the grate in the segment based on the first speed correction value.

Description

Technical Field

[0001] This invention relates to a control device for a combustion device, a control method for a combustion device, and a control program for a combustion device.

[0002] This application claims priority to Japanese Patent Application No. 2019-219250, filed in Japan on December 4, 2019, the contents of which are incorporated herein by reference. Background Technology

[0003] Patent document 1 discloses the following technology: based on the temperature distribution obtained from photographic data of a waste incinerator, the ignition point and burnout point are determined to detect the oxygen concentration of the exhaust gas, the total supply air volume within the specified oxygen concentration is calculated, and the combustion air volume is obtained by subtracting the necessary air volume of the combustion zone far from the dry zone from the total supply air volume and supplying it to the bellows.

[0004] Previous technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 3916450 Summary of the Invention

[0007] The technical problem to be solved by the invention

[0008] The combustion characteristics of waste, biomass, and other incinerated materials in combustion equipment vary greatly, and there is a problem that the unburned portion of the incinerated materials changes due to changes in the combustion state.

[0009] The present invention was made to solve the above-mentioned problems, and its purpose is to provide a control device for combustion equipment, a control method for combustion equipment, and a program.

[0010] means for solving technical problems

[0011] In the control device for the combustion equipment according to the present invention, the combustion equipment includes: a furnace body that defines a processing space; a grate that transports the incinerated material along a conveying direction in the processing space; and a bellows that supplies air to the processing space. The control device for the combustion equipment includes: an image acquisition unit that acquires and captures a processing image of a segment of the processing space divided along the conveying direction; a point determination unit that determines, based on the processing image, the end of the flame generated by the combustion of the incinerated material on the rear side of the conveying direction, i.e., the burnout point; a first speed calculation unit that calculates a speed correction value for the grate of the segment, i.e., a first speed correction value, based on the burnout point; and a speed control unit that controls the speed of the grate of the segment based on the first speed correction value.

[0012] In the control method of the combustion equipment involved in the present invention, the combustion equipment includes: a furnace body that defines a processing space; a grate that conveys the incinerated material along a conveying direction in the processing space; and a bellows that supplies air to the processing space. The control device of the combustion equipment includes the following steps: acquiring a processing image of a segment of the processing space divided along the conveying direction; determining, based on the processing image, the end of the flame generated by the combustion of the incinerated material on the rear side of the conveying direction, i.e., the burnout point; calculating, based on the burnout point, a speed correction value of the grate of the segment, i.e., a first speed correction value; and controlling the speed of the grate of the segment based on the first speed correction value.

[0013] The program involved in this invention is a control device program for a combustion equipment, the combustion equipment comprising: a furnace body defining a processing space; a grate conveying incinerated material along a conveying direction in the processing space; and a bellows supplying air to the processing space. The program causes a computer to perform the following steps: acquiring a processing image of a segment of the processing space divided along the conveying direction; determining, based on the processing image, the end of the flame generated by the combustion of the incinerated material on the rear side of the conveying direction, i.e., the burnout point; calculating, based on the burnout point, a speed correction value of the grate for the segment, i.e., a first speed correction value; and controlling the speed of the grate for the segment based on the first speed correction value.

[0014] Invention Effects

[0015] According to the control device, control method and program of the combustion equipment of the present invention, the incinerated material can be stably burned in the combustion equipment. Attached Figure Description

[0016] Figure 1 This is a diagram illustrating the structure of the combustion device according to an embodiment of the present invention.

[0017] Figure 2 This is a diagram illustrating a coal feeder according to an embodiment of the present invention.

[0018] Figure 3 This is a schematic block diagram illustrating the structure of the control device according to an embodiment of the present invention.

[0019] Figure 4 This is a flowchart illustrating the actions involved in the speed control of the grate according to an embodiment of the present invention.

[0020] Figure 5 This is a reference diagram illustrating the speed control of the grate according to an embodiment of the present invention.

[0021] Figure 6 This is a flowchart illustrating the actions involved in controlling the amount of air according to an embodiment of the present invention.

[0022] Figure 7 This is a reference diagram illustrating the control of the bellows according to an embodiment of the present invention.

[0023] Figure 8 This is a schematic block diagram illustrating the structure of the control device according to an embodiment of the present invention.

[0024] Figure 9 This is a schematic block diagram illustrating the structure of the control device according to an embodiment of the present invention.

[0025] Figure 10 This is a flowchart illustrating the operations involved in controlling the secondary air control unit according to an embodiment of the present invention.

[0026] Figure 11 This is a block diagram illustrating the structure of the control device according to an embodiment of the present invention.

[0027] Figure 12 This is a block diagram illustrating the structure of the control device according to an embodiment of the present invention.

[0028] Figure 13 It is a schematic block diagram showing the structure of a computer according to at least one embodiment. Detailed Implementation

[0029] <First Implementation>

[0030] Structure of Combustion Devices

[0031] The structure of the combustion apparatus 100 according to the first embodiment will be described below. The combustion apparatus 100 according to the first embodiment is an apparatus for incinerating waste 400. Examples of the combustion apparatus 100 include a waste incineration coal-fired boiler and a biomass fluidized bed boiler. The combustion apparatus 100 according to the first embodiment is a waste incineration coal-fired boiler.

[0032] Figure 1 This is a diagram showing the structure of the combustion equipment 100 according to the first embodiment. The combustion equipment 100 includes a coal-feeding furnace 1, a waste heat recovery boiler 8, a cooling tower 9, a dust collection device 11, a chimney 12, and a control device 300.

[0033] The coal-fired furnace 1 is a furnace that simultaneously feeds and burns the incinerated material 400. Examples of the incinerated material 400 include waste and biomass. Figure 1 The incinerated material 400 is waste. As the incinerated material 400 is burned by the coal-fired boiler 1, waste gas is generated from the coal-fired boiler 1. This waste gas is transported to the waste heat recovery boiler 8 located above the coal-fired boiler 1.

[0034] Waste heat recovery boiler 8 heats water to generate steam through heat exchange between waste gas and water. This steam is utilized in an external device not shown. The waste gas from waste heat recovery boiler 8 is cooled in cooling tower 9 and then conveyed to dust collection device 11. After soot or dust is removed in dust collection device 11, the waste gas is discharged into the atmosphere through chimney 12.

[0035] Next, the structure of the coal-feeding furnace 1 will be described. For example... Figure 1 As shown, the coal-feeding furnace 1 includes a furnace body 10, a furnace 7 extending upward from the furnace body 10, a hopper 3 for temporarily storing the incinerated material 400, a feeder 31 for supplying the incinerated material 400 from the hopper 3 into the furnace body 10, and a coal feeder 6 installed at the bottom of the furnace body 10. Furthermore, the coal-feeding furnace 1 includes a discharge chute 13 for discharging the incinerated material 400 to the outside, a bellows 2 installed below the coal feeder 6, a cleaning roller 210 for moving the incinerated material 400 to the discharge chute 13, and a camera 220 for capturing images of the furnace body 10's containing space V. The coal-feeding furnace 1 also includes a blower B1 for supplying air into a primary air pipe L1 and a secondary air pipe L2, a primary air pipe L1 for supplying air to the bellows 2, and a secondary air pipe L2 for supplying air to the furnace 7.

[0036] Figure 2 This diagram shows the coal feeder 6 in the combustion apparatus 100 according to the first embodiment. Figure 2 As shown, the coal feeder 6 consists of multiple grates 61. Among the grates 61 are fixed grates 61A and movable grates 61B. Fixed grate 61A is a stationary grate 61. Movable grate 61B agitates the material 400 on the grate 61 by moving at a constant speed in the conveying direction +Da and the conveying reverse direction -Da. The conveying direction +Da is from the hopper 3 towards the discharge chute 13. The conveying reverse direction -Da is the opposite direction of the conveying direction Da. Figure 2 The combination structure of the fixed grate 61A and the movable grate 61B shown is an example, but different combinations are also possible.

[0037] A processing space V for burning the incinerated material 400 is formed inside the furnace body 10. Within this processing space V, the incinerated material 400 is conveyed by the coal feeder 6 from the feeder 31 along a conveying direction +Da toward the discharge chute 13. The burned incinerated material 400 is discharged to the outside through the discharge chute 13. In this embodiment, the coal feeder 6 is horizontally arranged. On the other hand, in another embodiment, the coal feeder 6 may also be inclined relative to the horizontal plane.

[0038] The furnace body 10 is designed sequentially from the upstream side of the conveying direction +Da as a drying section 21, a combustion section 22, and a post-combustion section 23. The drying section 21, combustion section 22, and post-combustion section 23 divide the processing space V along the conveying direction Da. The drying section 21 is used to dry the incinerator 400 supplied from the hopper 3 before combustion. The combustion section 22 and post-combustion section 23 are used to burn the dried incinerator 400. In the combustion section 22, a flame F is generated by the pyrolysis gases produced from the incinerator 400. In the post-combustion section 23, since the fixed carbon of the incinerator 400 is burned, no flame F is generated. That is, the flame F accompanying combustion is mainly formed above the combustion section 22.

[0039] The furnace 7 extends upwards from the upper part of the furnace body 10. Waste gas from the treatment space V is transported to the waste heat recovery boiler 8 via the furnace 7. A primary air duct L1 connects the blower B1 to the bellows 2. Air is supplied to the bellows 2 via the primary air duct L1 by driving the blower B1. The bellows 2 supplies air from below the grate 61. A secondary air duct L2 connects the blower B1 to the interior of the furnace 7. Combustion air is supplied to the interior of the furnace 7 from above the grate 61 via the secondary air duct L2. The bellows 2 form the bottom surface of the treatment space V. Multiple bellows 2 are arranged along the conveying direction Da.

[0040] The cleaning roller 210 rotates to move the incinerated material 400 from the post-combustion section 23 to the discharge chute 13. The cleaning roller 210 rotates at intervals set by the control device 300.

[0041] Camera 220 captures processed images of the drying section 21, combustion section 22, and post-combustion section 23 of the processing space V. The processed space V is captured by camera 220, and the bright flames generated from the incinerated material 400 are captured in the processed images generated by camera 220. As an example of camera 220, a camera equipped with both a visual camera and a far-infrared camera can be cited.

[0042] The measuring unit 230 is a device for measuring the steam flow rate and oxygen concentration in the processing space V. The incinerator 400 is dried in the drying section 21, generating steam due to moisture evaporation. The measuring unit 230 measures the steam flow rate generated by the drying of the incinerator 400. In the drying section 21, the more intense the drying of the incinerator 400, the greater the steam flow rate. On the other hand, in the combustion section 22, the incinerator 400 is burned using the oxygen in the processing space V. That is, in the combustion section 22, the more intense the combustion of the incinerator 400, the lower the oxygen concentration.

[0043] The control device 300 calculates the speed correction value of the grate 61 and the air volume correction value supplied by the bellows 2 to control the grate 61 and the bellows 2. Figure 3This is a schematic block diagram showing the structure of the control device 300. The control device 300 includes an acquisition unit 310, a point determination unit 320, a first speed calculation unit 330, a first air volume calculation unit 340, a flow rate concentration calculation unit 350, a speed control unit 360, and an air volume control unit 370. The control device 300 is connected to the combustion equipment 100 via wired or wireless means.

[0044] The acquisition unit 310 is an example of an image measurement unit, which acquires processed images from the camera 220 and acquires steam flow rate and oxygen concentration from the measurement unit 230.

[0045] The point determination unit 320 determines the burnout point Z, the end point behind the conveying direction Da of the flame F generated by the combustion of the incinerated material 400, based on the processed image acquired by the acquisition unit 310. Specifically, the point determination unit 320 determines the burnout point Z by the following operations.

[0046] The point determination unit 320 receives the processed image acquired by the acquisition unit 310. Then, the point determination unit 320 binarizes the processed image based on a preset threshold according to the brightness of the processed image. The point determination unit 320 determines the burnout point Z using the average value of the points where the value of the binarized processed image changes. The image related to the location where a flame F is generated by the burning material 400 is high in brightness, while the image related to the location where no flame F is generated is low in brightness. Therefore, the point determination unit 320 can determine the burnout point Z through binarization as described above.

[0047] The first speed calculation unit 330 calculates the speed correction value, i.e., the first speed correction value, of the grate 61 of each of the drying section 21, the combustion section 22, and the post-combustion section 23 based on the burnout point Z determined by the point determination unit 320. Specifically, the first speed calculation unit 330 calculates the first speed correction value by performing the following operations.

[0048] The first speed calculation unit 330 acquires the burnout point Z determined by the point determination unit 320. Then, the first speed calculation unit 330 calculates the difference between the reference burnout point associated with the drying section 21 and the burnout point Z, and performs PID (Proportional-Integral-Differentiary) calculation on the difference to calculate the first speed correction value associated with the drying section 21. In the combustion section 22 and the afterburning section 23, the first speed calculation unit 330 also calculates the first speed correction value associated with the combustion section 22 and the first speed correction value associated with the afterburning section 23 through the operations described above.

[0049] Furthermore, the reference burnout point is a point predetermined in each of the drying section 21, the combustion section 22, and the afterburning section 23 to ensure that the incinerated material 400 is stably dried, burned, and afterburned. As an example of the reference burnout point, a burnout point in which the proportion of the unburned portion of the incinerated material 400 is set to a specific value can be cited.

[0050] The first air volume calculation unit 340 calculates the correction value of the air volume supplied by the air box 2 to each of the drying section 21, the combustion section 22, and the after-combustion section 23 based on the burnout point Z determined by the point determination unit 320. Specifically, the first air volume calculation unit 340 calculates the first air volume correction value by performing the following operations.

[0051] The first air volume calculation unit 340 acquires the burnout point Z determined by the point determination unit 320. Then, it calculates the difference between the reference burnout point associated with the drying section 21 and the burnout point Z, and performs PID calculations on this difference to calculate the first air volume correction value associated with the drying section 21. In the combustion section 22 and the after-combustion section 23, the first air volume calculation unit 340 also calculates the first air volume correction value associated with the combustion section 22 and the first air volume correction value associated with the after-combustion section 23 through the operations described above. When the burnout point Z is located upstream of the reference burnout point, the difference between the reference burnout point and the burnout point Z is a positive value. The position of the reference burnout point is different in each of the drying section 21, combustion section 22, and after-combustion section 23. The position of the reference burnout point in the drying section 21 is located at the upstream end of the conveying direction +Da, and the position of the reference burnout point in the after-combustion section 23 is located at the downstream end of the conveying direction +Da.

[0052] The flow rate concentration calculation unit 350 calculates a basic correction value based on the steam flow rate and oxygen concentration obtained by the measurement unit 230. Specifically, the flow rate concentration calculation unit 350 calculates the basic correction value through the following operations.

[0053] The flow rate concentration calculation unit 350 receives the steam flow rate and oxygen concentration acquired by the measurement unit 230. The flow rate concentration calculation unit 350 divides the acquired steam flow rate by a reference steam flow rate to calculate a difference. The flow rate concentration calculation unit 350 multiplies the difference by a weight associated with the steam flow rate to calculate a steam flow rate correction value. Furthermore, the flow rate concentration calculation unit 350 divides the acquired oxygen concentration by a reference oxygen concentration to calculate a difference. The flow rate concentration calculation unit 350 multiplies the difference by a weight associated with the oxygen concentration to calculate an oxygen concentration correction value. The flow rate concentration calculation unit 350 adds the steam flow rate correction value and the oxygen concentration correction value to calculate a basic correction value.

[0054] The speed control unit 360 controls the speed of the grate 61 in the drying section 21, the combustion section 22, and the post-combustion section 23 based on the first speed correction value calculated by the first speed calculation unit 330. Specifically, the speed control unit 360 controls the speed of the grate 61 by the following actions.

[0055] The speed control unit 360 acquires the first speed correction value associated with the drying section 21 from the first speed correction values ​​calculated by the first speed calculation unit 330. If the first speed correction value associated with the drying section 21 is below a preset lower limit, the speed control unit 360 uses that lower limit as the first speed correction value. Furthermore, if the first speed correction value associated with the drying section 21 is above a preset upper limit, the speed control unit 360 uses that upper limit as the first speed correction value. Here, both the upper and lower limits of the first speed correction value are positive values. Therefore, when the burnout point Z is downstream of the reference burnout point, the first speed correction value is equal to the lower limit. This is because when the burnout point Z is downstream of the reference burnout point, the difference between the reference burnout point and the burnout point Z is negative. That is, the first speed correction value is the value used to promote the movement of the burnout point Z downstream when the burnout point Z exceeds the reference position and exists upstream.

[0056] Then, the speed control unit 360 adds a first speed correction value to the basic grate speed associated with the drying section 21 to calculate the corrected speed associated with the drying section 21. The speed control unit 360 sends an electrical signal to the actuator of the movable grate 61B of the drying section 21 so that the movable grate 61B can move at the corrected speed. Upon receiving the above electrical signal, the movable grate 61B can move at the corrected speed.

[0057] The speed control unit 360 also performs the same operation as described above in the grate 61 of the combustion section 22 and the grate 61 of the post-combustion section 23.

[0058] The air volume control unit 370 controls the amount of air supplied by the air box 2 to each of the drying section 21, the combustion section 22, and the aftercombustion section 23 based on the first air volume correction value calculated by the first air volume calculation unit 340 and the basic correction value calculated by the flow concentration calculation unit 350. Specifically, the air volume control unit 370 controls the air box 2 by the following actions.

[0059] The air volume control unit 370 acquires the first air volume correction value associated with the drying section 21 from the first air volume correction values ​​calculated by the first air volume calculation unit 340. If the first air volume correction value associated with the drying section 21 is below a preset lower limit, the air volume control unit 370 uses that lower limit as the first air volume correction value. Furthermore, if the first air volume correction value associated with the drying section 21 is above a preset upper limit, the air volume control unit 370 uses that upper limit as the first air volume correction value.

[0060] Here, both the upper and lower limits of the first air quantity correction value are positive. Therefore, when the burnout point Z is downstream of the reference burnout point, the first air quantity correction value is equal to the lower limit. This is because, when the burnout point Z is downstream of the reference burnout point, the difference between the reference burnout point and the burnout point Z is negative. That is, the first air quantity correction value is the value used to promote the movement of the burnout point Z downstream when the burnout point Z exceeds the reference position and exists upstream.

[0061] Then, the air volume control unit 370 acquires the basic correction value calculated by the flow concentration calculation unit 350. The air volume control unit 370 calculates the corrected air volume by adding the first air volume correction value associated with the drying section 21 to the basic correction value. The air volume control unit 370 sends an electrical signal to the air box 2 of the drying section 21 so that the air volume supplied to the drying section 21 by the air box 2 becomes the corrected air volume. Upon receiving the electrical signal, the air box 2 changes the opening degree of the damper provided by the air box 2 so that the air volume supplied to the drying section 21 by the air box 2 becomes the corrected air volume.

[0062] The air volume control unit 370 also performs the same operation as described above in the air box 2 of the combustion section 22 and the air box 2 of the after-combustion section 23.

[0063] Actions involved in controlling grate speed

[0064] The following describes the actions involved in controlling the speed of the grate 61 of the combustion device 100. Figure 4 This is a flowchart showing the actions involved in controlling the speed of the grate 61.

[0065] The first speed calculation unit 330 obtains the burnout point Z determined by the point determination unit 320 (step S1).

[0066] The first speed calculation unit 330 calculates the burnout point Z obtained in step S1, the reference burnout point associated with each of the drying section 21, the combustion section 22 and the post-combustion section 23, and the difference between the burnout point Z, and performs PID calculation on the difference to calculate the first speed correction value associated with each of the drying section 21, the combustion section 22 and the post-combustion section 23 (step S2).

[0067] The speed control unit 360 acquires a first speed correction value associated with each of the drying section 21, the combustion section 22 and the after-combustion section 23 (step S3).

[0068] If the first speed correction value associated with each of the drying section 21, combustion section 22 and after combustion section 23 is above the upper limit value associated with each of the drying section 21, combustion section 22 and after combustion section 23 (step S4: Yes), the speed control unit 360 uses the upper limit value as the first speed correction value (step S6).

[0069] Furthermore, if the first speed correction value associated with each of the drying section 21, the combustion section 22, and the after-combustion section 23 is below the lower limit value associated with each of the drying section 21, the combustion section 22, and the after-combustion section 23 (step S5: Yes), the speed control unit 360 uses the lower limit value as the first speed correction value (step S7).

[0070] The speed control unit 360 adds the basic grate speed associated with each of the drying section 21, combustion section 22 and post-combustion section 23 to the first speed correction value associated with each of the drying section 21, combustion section 22 and post-combustion section 23 to calculate the corrected speed associated with each of the drying section 21, combustion section 22 and post-combustion section 23 (step S8).

[0071] The speed control unit 360 sends electrical signals to the actuators of the movable grate 61B in the drying section 21, the combustion section 22 and the post-combustion section 23, so that the movable grate 61B can move at the corrected speed (step S9).

[0072] The movable grate 61B, which receives an electrical signal in step S9, can move at a corrected speed (step S10).

[0073] Figure 5 This is a reference diagram showing the speed control of grate 61.

[0074] The first speed calculation unit 330 performs PID control on the reference burnout point Z obtained by the burnout point determination unit 320 associated with each of the drying section 21, combustion section 22, and post-combustion section 23 to calculate a first speed correction value. Then, the speed control unit 360 determines the first speed correction value based on upper and lower limits and sends a signal to the movable grate 61B based on the first speed correction value and the reference grate speed so that the movable grate 61B can move at the corrected speed.

[0075] Through the aforementioned actions, the user of the combustion equipment 100 can control the speed of the grate 61 based on the determined burnout point Z, thereby enabling the incinerated material 400 to be stably dried, burned, and post-burned within the combustion equipment 100. When the burnout point Z is located closer to the drying section 21, the proportion of unburned portion of the incinerated material 400 decreases, thus reducing the throughput of the incinerated material 400 per unit time using the combustion equipment 100 and decreasing the efficiency of the combustion equipment 100. Furthermore, when the burnout point Z is located closer to the cleaning roller 210, the proportion of unburned portion of the incinerated material 400 increases, making it difficult to landfill the post-burned incinerated material 400.

[0076] Therefore, in the control device 300 of this embodiment, when the burnout point Z is close to the drying section 21, the speed of the grate 61 is reduced to make the stirring of the incinerated material 400 more active, thereby increasing the proportion of unburned portion. When the burnout point Z is close to the cleaning roller 210, the speed of the grate 61 is increased to make the stirring of the incinerated material 400 more active, thereby decreasing the proportion of unburned portion.

[0077] Actions involved in controlling air volume

[0078] The following describes the actions involved in controlling the air volume of the combustion device 100. Figure 6 It is a flowchart representing the actions involved in controlling the amount of air.

[0079] The first air volume calculation unit 340 obtains the burnout point Z determined by the point determination unit 320 (step S21).

[0080] The first air volume calculation unit 340 calculates the difference between the burnout point Z obtained in step S21, the reference burnout point associated with each of the drying section 21, the combustion section 22 and the after-combustion section 23, and the burnout point Z, and performs PID calculation on the difference to calculate the first air volume correction value associated with each of the drying section 21, the combustion section 22 and the after-combustion section 23 (step S22).

[0081] The air volume control unit 370 acquires a first air volume correction value associated with each of the drying section 21, the combustion section 22 and the after-combustion section 23 (step S23).

[0082] If the first air volume correction value associated with each of the drying section 21, combustion section 22 and post-combustion section 23 is above the upper limit value associated with each of the drying section 21, combustion section 22 and post-combustion section 23 (step S24: Yes), the air volume control unit 370 uses the upper limit value as the first air volume correction value (step S26).

[0083] Furthermore, if the first air volume correction value associated with each of the drying section 21, the combustion section 22, and the after-combustion section 23 is below the lower limit value associated with each of the drying section 21, the combustion section 22, and the after-combustion section 23 (step S25: Yes), the air volume control unit 370 uses the lower limit value as the first air volume correction value (step S27).

[0084] The air volume control unit 370 adds the basic correction value calculated by the flow concentration calculation unit 350 to the first air volume correction value associated with each of the drying section 21, the combustion section 22 and the after-combustion section 23 to calculate the corrected air volume associated with each of the drying section 21, the combustion section 22 and the after-combustion section 23 (step S28).

[0085] The air volume control unit 370 sends an electrical signal to the air box 2 of each of the drying section 21, the combustion section 22 and the after-combustion section 23, so that the air box 2 supplies the corrected air volume to each of the drying section 21, the combustion section 22 and the after-combustion section 23 (step S29).

[0086] The bellows 2, having received an electrical signal in step S29, changes the opening of its damper to supply the corrected air volume (step S30).

[0087] Figure 7 This is a reference diagram showing the control of bellows 2.

[0088] The first air volume calculation unit 340 performs PID calculations on the reference burnout point and the burnout point Z obtained by the point determination unit 320 associated with each of the drying section 21, the combustion section 22, and the after-combustion section 23 to calculate the first air volume correction value. Then, the air volume control unit 370 determines the first air volume correction value based on the upper and lower limits, and sends a signal to the air box 2 based on the first air volume correction value and the reference correction value to supply the corrected air volume.

[0089] Through the above actions, the user of the combustion device 100 can control the bellows 2 according to the determined burnout point Z, thus enabling the incinerated material 400 to be stably dried, burned, and post-burned in the combustion device 100.

[0090] When the burnout point Z is closer to the drying section 21, the proportion of unburned portion of the incinerated material 400 decreases, thus reducing the throughput of the incinerated material 400 per unit time using the combustion equipment 100 and decreasing the efficiency of the combustion equipment 100. Furthermore, when the burnout point Z is closer to the cleaning roller 210, the proportion of unburned portion of the incinerated material 400 increases, making it difficult to burn the incinerated material 400 after landfilling.

[0091] Therefore, in the control device 300 of this embodiment, when the burnout point Z is close to the drying section 21, the opening of the damper of the bellows 2 is reduced to increase the proportion of unburned portion of the incinerated material 400, and when the burnout point Z is close to the cleaning roller 210, the opening of the damper of the bellows 2 is increased to reduce the proportion of unburned portion.

[0092] In the embodiments described above, after the speed control unit 360 controls the grate 61, the air volume control unit 370 controls the bellows 2. Furthermore, after the air volume control unit 370 controls the bellows 2, the speed control unit 360 can control the grate 61.

[0093] Function / Effect

[0094] In the control device 300 of the combustion device 100 according to the present invention, the combustion device 100 includes: a furnace body 10, which defines a processing space V; a grate 61, which transports the incinerated material 400 in the processing space V along the transport direction Da; and a bellows 2, which supplies air to the processing space V. The control device 300 of the combustion device 100 includes: an image acquisition unit, which acquires and captures a processing image of a segment of the processing space V divided along the transport direction Da; a point determination unit 320, which determines, based on the processing image, the end of the flame F generated by the combustion of the incinerated material 400 in the transport direction, i.e., the burnout point Z; a first speed calculation unit 330, which calculates the speed correction value of the grate 61 in the segment, i.e., the first speed correction value, based on the burnout point Z; and a speed control unit 360, which controls the speed of the grate 61 in the segment based on the first speed correction value.

[0095] The user of the combustion device 100 can control the speed of the grate 61 according to the determined burnout point Z, thus enabling the incinerated material 400 to burn stably in the combustion device 100.

[0096] Furthermore, the control device 300 of the combustion equipment 100 is divided into sections of the processing space V, which are, from the upstream side of the conveying direction Da, a drying section 21, a combustion section 22, and a post-combustion section 23. The image acquisition unit acquires processed images of the drying section 21, the combustion section 22, and the post-combustion section 23. The first speed calculation unit 330 calculates the first speed correction value for each of the drying section 21, the combustion section 22, and the post-combustion section 23. The speed control unit 360 controls the speed of the grate 61 of the drying section 21, the combustion section 22, and the post-combustion section 23 according to each of the first speed correction values.

[0097] The user of the combustion device 100 can control the speed of the grate 61 according to the determined burnout point Z, thus enabling the incinerated material 400 to be stably dried, burned, and post-burned in the combustion device 100.

[0098] Furthermore, the control device 300 of the combustion device 100 includes: a first air volume calculation unit 340, which calculates a correction value for the amount of air supplied to each section, namely the first air volume correction value, based on the burnout point Z; and an air volume control unit 370, which controls the amount of air supplied to each section by the bellows 2 based on the first air volume correction value.

[0099] The user of the combustion device 100 can control the air box 2 according to the determined burnout point Z, thus enabling the incinerated material 400 to be stably dried, burned, and post-burned in the combustion device 100.

[0100] <Second Implementation Method>

[0101] The combustion apparatus 100 according to the second embodiment will be described below. The combustion apparatus 100 according to the second embodiment controls the speed of the grate 61 and controls the air box 2 according to the load values ​​in the drying section 21, the combustion section 22 and the post-combustion section 23.

[0102] Figure 8 This is a schematic block diagram showing the structure of the control device 300 according to the second embodiment. In addition to the structure of the control device 300 according to the first embodiment, the control device 300 according to the second embodiment also includes a determination unit 379, a load value determination unit 380, a second speed calculation unit 381, a second air volume calculation unit 382, ​​a second speed control unit 383, and a second air volume control unit 384.

[0103] The determination unit 379 obtains the burnout point Z from the point determination unit 320 to determine whether the burnout point Z is within a preset range. The preset range of the burnout point is, for example, set downstream of the reference burnout point of the later combustion stage. That is, the determination unit 379 determines whether the combustion state is a poor burnout state.

[0104] The load value determination unit 380 determines a load value, representing the load state of each of the drying section 21, the combustion section 22, and the post-combustion section 23, based on at least one of the brightness of the processed image, the moisture content of the incinerated material 400, and the lower heating value of the incinerated material 400. Specifically, the load value determination unit 380 determines the load value by the following operations: The greater the load involved in combustion, the larger the load value. The higher the calorific value of the incinerated material, the higher the load; the greater the moisture content of the incinerated material, the lower the load.

[0105] The load value determination unit 380 divides the processed image acquired by the acquisition unit 310 into regions of drying section 21, combustion section 22, and post-combustion section 23, and calculates the average brightness of the image involved in each region to determine the load value of drying section 21, combustion section 22, and post-combustion section 23. This is because the greater the load involved in combustion, the stronger the flame, so it can be inferred that the higher the brightness in the processed image, the greater the load. Furthermore, the load value determination unit 380 determines the load value of drying section 21, combustion section 22, and post-combustion section 23 based on the water content per unit mass of the incinerated material 400 obtained from the sample of the incinerated material 400 input into the combustion device 100. Additionally, the load value determination unit 380 determines the load value of drying section 21, combustion section 22, and post-combustion section 23 based on the lower heating value per unit mass of the incinerated material 400 obtained from the sample of the incinerated material 400 input into the combustion device 100.

[0106] The second speed calculation unit 381 calculates the speed correction value, i.e., the second speed correction value, of the grate 61 in the drying section 21, the combustion section 22, and the post-combustion section 23 based on the difference between the preset value and the load value. Specifically, the second speed calculation unit 381 calculates the second speed correction value through the following operations.

[0107] The second speed calculation unit 381 acquires the load value associated with the drying section 21 determined by the load value determination unit 380. The second speed calculation unit 381 calculates the difference between the preset value and the load value, and performs PID calculation on the difference to calculate the second speed correction value. The second speed calculation unit 381 also performs the same operation as described above to calculate the second speed correction value in the combustion section 22 and the aftercombustion section 23.

[0108] The second air volume calculation unit 382 calculates the correction value, i.e., the second air volume correction value, of the air volume supplied by the air box 2 of each of the drying section 21, combustion section 22 and after-combustion section 23 based on the difference between the reference load value and the load value. Specifically, the second air volume calculation unit 382 calculates the second air volume correction value through the following operations.

[0109] The second air volume calculation unit 382 acquires the load value associated with the drying section 21 determined by the load value determination unit 380. The second air volume calculation unit 382 calculates the difference between the reference load value and the load value, and performs PID calculation on the difference to calculate the second air volume correction value. The second air volume calculation unit 382 also performs the same operation as described above in the combustion section 22 and the aftercombustion section 23 to calculate the second air volume correction value.

[0110] If the determination unit 379 determines that the burnout point Z is within a preset range, the second speed control unit 383 controls the speed of the grate 61 in each of the drying section 21, combustion section 22, and post-combustion section 23 according to the second speed correction value. Specifically, the second speed control unit 383 controls the speed of the grate 61 by the following actions: If the determination unit 379 determines that the burnout point Z is not within a preset range, the second speed control unit 383 does not operate, but the speed control unit 360 or the air volume control unit 370 operates to keep the burnout point Z within a certain range.

[0111] The second speed control unit 383 acquires the second speed correction value associated with the drying section 21 from the second speed correction values ​​calculated by the second speed calculation unit 381. If the second speed correction value associated with the drying section 21 is below a preset lower limit, the second speed control unit 383 uses that lower limit as the second speed correction value. Furthermore, if the second speed correction value associated with the drying section 21 is above a preset upper limit, the second speed control unit 383 uses that upper limit as the second speed correction value. Here, the upper limit of the second speed correction value is positive, and the lower limit is negative. Therefore, when the load is lower than the reference, i.e., when the combustion state is a low load state, the second speed control unit promotes the movement of the incinerated material to increase the load; when the load is higher than the reference, i.e., when the combustion state is an overload state, the second speed control unit promotes the movement of the incinerated material to decrease the load.

[0112] Then, the second speed control unit 383 adds a second speed correction value to the basic grate speed associated with the drying section 21 to calculate the second corrected speed associated with the drying section 21. The second speed control unit 383 sends an electrical signal to the actuator of the movable grate 61B of the drying section 21 so that the movable grate 61B can move at the second corrected speed. Upon receiving the above electrical signal, the movable grate 61B can move at the second corrected speed.

[0113] The second speed control unit 383 also performs the same operation as described above in the grate 61 of the combustion section 22 and the grate 61 of the post-combustion section 23.

[0114] When the determination unit 379 determines that the burnout point Z is within a preset range, the second air volume control unit 384 controls the amount of air supplied by the bellows 2 to each of the drying section 21, the combustion section 22, and the aftercombustion section 23 based on the second air volume correction value calculated by the second air volume calculation unit 382 and the basic correction value calculated by the flow concentration calculation unit 350. Specifically, the second air volume control unit 384 controls the bellows 2 through the following actions.

[0115] The second air volume control unit 384 acquires the second air volume correction value associated with the drying section 21 from the second air volume correction values ​​calculated by the second air volume calculation unit 382. If the second air volume correction value associated with the drying section 21 is below a preset lower limit, the second air volume control unit 384 uses that lower limit as the second air volume correction value. Furthermore, if the second air volume correction value associated with the drying section 21 is above a preset upper limit, the second air volume control unit 384 uses that upper limit as the second air volume correction value. Here, the upper limit of the second speed correction value is positive, and the lower limit is negative. Therefore, when the load is lower than the reference, i.e., when the combustion state is a low load state, the second speed control unit promotes the movement of the incinerated material to increase the load; when the load is higher than the reference, i.e., when the combustion state is an overload state, it promotes the movement of the incinerated material to decrease the load.

[0116] Then, the second air volume control unit 384 acquires the basic correction value calculated by the flow concentration calculation unit 350. The second air volume control unit 384 calculates a second corrected air volume by adding the basic correction value to the second air volume correction value associated with the drying section 21. The second air volume control unit 384 sends an electrical signal to the air box 2 of the drying section 21 so that the air volume supplied to the drying section 21 by the air box 2 becomes the second corrected air volume. Upon receiving the electrical signal, the air box 2 changes the opening degree of the damper provided by the air box 2 so that the air volume supplied to the drying section 21 by the air box 2 becomes the second corrected air volume.

[0117] The second air volume control unit 384 also performs the same operation as described above in the air box 2 of the combustion section 22 and the air box 2 of the after-combustion section 23.

[0118] Function / Effect

[0119] The control device 300 of the combustion equipment 100 according to the present invention includes: a load value determination unit 380, which determines a value representing the load state of each section, i.e., a load value, based on at least one of the brightness of the processed image, the moisture content of the incinerated material 400, and the lower heating value of the incinerated material 400; a second speed calculation unit 381, which calculates a speed correction value, i.e., a second speed correction value, for each section of the grate 61 based on the difference between a preset value and the load value; and a second speed control unit 383, which controls the speed of each section of the grate 61 based on the second speed correction value.

[0120] The user of the combustion device 100 can control the speed of the grate 61 according to the determined load value, thus enabling the incinerated material 400 to burn stably in the combustion device 100.

[0121] The control device 300 of the combustion device 100 according to the present invention includes: a second air volume calculation unit 382, ​​which calculates the correction value of the air volume supplied by the bellows 2 to each section, i.e., the second air volume correction value, based on the difference between a preset value and a load value; and a second air volume control unit 384, which controls the air volume supplied by the bellows 2 to each section based on the second air volume correction value.

[0122] The user of the combustion device 100 can control the bellows 2 according to the determined load value, thus enabling the incinerated material 400 to burn stably in the combustion device 100.

[0123] <Third Implementation Method>

[0124] The combustion apparatus 100 according to the third embodiment will be described below. The combustion apparatus 100 according to the third embodiment determines the amount of the incinerated material 400 introduced into the drying section 21 in order to control the amount of air supplied by the secondary air pipeline L2.

[0125] Figure 9 This is a schematic block diagram showing the structure of the control device 300 according to the third embodiment. The structure of the control device 300 according to the third embodiment is the same as that of the control device 300 according to the first embodiment, but with the addition of a determination unit 379, a quantity determination unit 385, a quantity determination unit 386, and a secondary air control unit 387.

[0126] The measuring unit 230 in the third embodiment is an apparatus for measuring the steam flow rate, oxygen concentration, and gas temperature of the processing space V. The acquisition unit 310 acquires the steam flow rate, oxygen concentration, and gas concentration from the measuring unit 230.

[0127] The determination unit 379 obtains the burnout point Z from the point determination unit 320 to determine whether the burnout point Z is within a preset range.

[0128] The quantity determination unit 385 determines the amount of incinerated material 400 flowing into the drying section 21 based on the processed image acquired by the acquisition unit 310. Specifically, the quantity determination unit 385 determines the amount of incinerated material 400 by calculating the proportion of the area occupied by the incinerated material 400 in the image of the flame perspective image of the processing space V acquired by the acquisition unit 310 from the camera 220 in the image of the pre-set area where the drying section 21 is connected to the feeder 31.

[0129] The quantity determination unit 386 determines whether the quantity of the incinerated material 400 determined by the quantity determination unit 385 is above a preset value. This threshold is set to a value that can detect when the blockage of the incinerated material 400 in the hopper is cleared and a large amount of the incinerated material 400 is fed into the furnace body 10.

[0130] If the determination unit 379 determines that the ignition point Z is within a preset range, the secondary air control unit 387 controls the amount of air supplied by the secondary air pipeline L2 based on the determination content of the quantity determination unit 386 and the oxygen concentration and gas temperature obtained by the acquisition unit 310. Specifically, the secondary air control unit 387 controls the amount of air by the following actions.

[0131] If the determination unit 379 determines that the burnout point Z is within a preset range, and the quantity of incinerated material 400 determined by the quantity determination unit 385 is above a preset value, the secondary air control unit 387 receives gas temperature and oxygen concentration from the acquisition unit 310, and receives the quantity of incinerated material 400 from the quantity determination unit 385. The secondary air control unit 387 checks the received quantity of incinerated material 400, gas temperature, and oxygen concentration against preset information relating the quantity of incinerated material 400, gas temperature, oxygen concentration, and air quantity to determine the amount of air supplied by the secondary air pipeline L2. The secondary air control unit 387 sends a signal indicating this air quantity to the secondary air pipeline L2 and controls the amount of air supplied by the secondary air pipeline L2 to the supply quantity determined above.

[0132] On the other hand, if the determination unit 379 determines that the burnout point Z is within a preset range, and the quantity of the incinerated material 400 determined by the quantity determination unit 385 is not above a preset value, the secondary air control unit 387 receives the gas temperature and oxygen concentration from the acquisition unit 310. The secondary air control unit 387 checks the received gas temperature and oxygen concentration against preset information related to gas temperature, oxygen concentration, and air quantity to determine the amount of air supplied by the secondary air pipeline L2. The secondary air control unit 387 sends a signal indicating this air quantity to the secondary air pipeline L2 and controls the amount of air supplied by the secondary air pipeline L2 to the supply quantity determined above.

[0133] Actions involved in the control of the secondary air control unit

[0134] The following describes the operations involved in controlling the secondary air control unit 387. Figure 10 This is a flowchart illustrating the actions involved in the control of the secondary air control unit 387 when the determination unit 379 determines that the burnout point Z is within a preset range. Furthermore, the speed control of the grate 61 or the control of the damper opening of the bellows 2 in the third embodiment are the same as those involved in the first embodiment.

[0135] The quantity determination unit 385 determines the amount of incinerated material 400 flowing into the drying section 21 based on the processed image acquired by the acquisition unit 310 (step S41).

[0136] The quantity determination unit 386 determines whether the quantity of the incinerated material 400 determined by the quantity determination unit 385 is above a preset value (step S42).

[0137] If it is determined that the amount of incinerated material 400 determined by the quantity determination unit 385 is not above a preset value (step S43: No), the secondary air control unit 387 receives gas temperature and oxygen concentration from the acquisition unit 310. The secondary air control unit 387 checks the received gas temperature and oxygen concentration against preset information related to gas temperature, oxygen concentration, and air quantity to determine the amount of air supplied by the secondary air pipeline L2. The secondary air control unit 387 sends a signal indicating the air quantity to the secondary air pipeline L2 and controls the amount of air supplied by the secondary air pipeline L2 to the supply quantity determined above (step S44).

[0138] On the other hand, if it is determined that the amount of incinerated material 400 determined by the quantity determination unit 385 is greater than or equal to a preset value (step S43: Yes), the secondary air control unit 387 receives the amount of incinerated material 400 from the quantity determination unit 385 and receives the gas temperature and oxygen concentration from the acquisition unit 310. The secondary air control unit 387 checks the received amount of incinerated material 400, gas temperature, and oxygen concentration against the preset information relating the amount of incinerated material 400, gas temperature, oxygen concentration, and air quantity to determine the amount of air supplied by the secondary air pipeline L2. The secondary air control unit 387 sends a signal indicating the air quantity to the secondary air pipeline L2 and controls the amount of air supplied by the secondary air pipeline L2 to the supply quantity determined above (step S45).

[0139] Through the above actions, the user of the combustion device 100 can also control the amount of air supplied from the secondary air pipeline L2 according to the amount of the incinerated material 400, and can use the air to stably maintain the combustion state of the incinerated material 400.

[0140] When a large amount of incinerated material 400 is fed into the furnace body 10, the combustion state becomes unstable, such as an increase in the proportion of unburned portion of the incinerated material 400 in the combustion device 100. Therefore, by detecting the state in which a large amount of incinerated material 400 is fed into the furnace body 10, and by supplying a large amount of air from the secondary air pipe L2 for combustion, stable combustion of the incinerated material 400 can be achieved.

[0141] Function / Effect

[0142] In the control device 300 of the combustion device 100 according to the embodiment of the present invention, the combustion device 100 further includes a secondary air pipe L2 that supplies air from above the grate 61. The control device 300 of the combustion device 100 includes: a quantity determination unit 385 that determines the quantity of the incinerated material 400 flowing into the section based on a processed image; a quantity determination unit 386 that determines whether the determined quantity is greater than or equal to a preset value; and a secondary air control unit 387 that controls the amount of air supplied by the secondary air pipe L2 based on the determination.

[0143] The user of the combustion device 100 can also control the amount of air supplied from the secondary air pipeline L2 according to the amount of the incinerated material 400, and can use the air to stably maintain the combustion state of the incinerated material 400.

[0144] <Fourth Implementation Method>

[0145] The combustion device 100 according to the fourth embodiment will be described below. The combustion device 100 according to the fourth embodiment uses a learned model generated from the burnout point Z, the speed of the grate 61, etc., to calculate the first speed correction value.

[0146] Figure 11 This is a block diagram illustrating the structure of the control device 300 according to the fourth embodiment. The structure of the control device 300 according to the fourth embodiment is the same as that of the control device 300 according to the first embodiment, but with the addition of a model generation unit 390, a model storage unit 391, a candidate generation unit 392, and a flow calculation unit 393.

[0147] The model generation unit 390 generates a learned model based on a dataset consisting of input samples and output samples, and records it in the model storage unit 391. The learned model is a machine learning model that outputs the steam flow rate of the combustion device by inputting a combination of state variables representing the state of the combustion device and control variables of the combustion device. An example of the operation of the model generation unit 390 will be described below.

[0148] As input samples, the model generation unit 390 uses the ignition point Z of combustion section 22, the drying state of drying section 21, the combustion state of combustion section 22, the post-combustion state of post-combustion section 23, oxygen concentration, the lower heating value of the incinerated material 400, the pressure value of the containment space V, gas temperature, steam flow rate, the opening degree of the damper of the bellows 2, the stroke of the dust collection device 11, the speed of the grate 61 of drying section 21, the speed of the grate 61 of combustion section 22, and the speed of the grate 61 of post-combustion section 23. That is, the ignition point Z of combustion section 22, the drying state of drying section 21, the combustion state of combustion section 22, the post-combustion state of post-combustion section 23, oxygen concentration, the lower heating value of the incinerated material 400, the pressure value of containment space V, and gas temperature are state quantities representing the state of the combustion equipment. Furthermore, the opening degree of the damper of the bellows 2, the stroke of the dust collection device 11, the speed of the grate 61 in the drying section 21, the speed of the grate 61 in the combustion section 22, and the speed of the grate 61 in the post-combustion section 23 are control variables of the combustion equipment. The drying state of the drying section 21, the combustion state of the combustion section 22, and the post-combustion state of the post-combustion section 23 can be determined, for example, by the position of the burnout point Z or the load value determined by the point determination unit 320.

[0149] Furthermore, the model generation unit 390 uses steam flow rate as the output sample. The model generation unit 390 uses the dataset composed of the aforementioned input samples and output samples to perform learning processing on a machine learning model. Examples of machine learning models used by the model generation unit 390 include LSTM (Long Short-Term Memory) or GRU (Gated Recurrent Unit). The machine learning model is a function with internal weight coefficients. The model generation unit 390 updates the weight coefficients of the machine learning model to obtain output samples from the input samples using a learning method, thereby generating a learned model. The model generation unit 390 records the learned model in the model storage unit 391. The learned model is a combination of the machine learning model and the weight coefficients updated through the learning process.

[0150] The model storage unit 391 stores the learned models generated by the model generation unit 390.

[0151] The candidate generation unit 392 generates candidate velocities for the grates 61 of each of the drying section 21, combustion section 22, and post-combustion section 23. For example, the candidate generation unit 392 generates candidates that correlate the velocities of the grates 61 of each of the drying section 21, combustion section 22, and post-combustion section 23 with the opening rate of the dampers of the wind box 2.

[0152] The flow calculation unit 393 inputs the burnout point Z determined by the point determination unit 320, the ignition point in the combustion section 22, the drying state of the drying section 21, the combustion state of the combustion section 22, the post-combustion state of the post-combustion section 23, the oxygen concentration, the lower heating value of the incinerated material 400, the pressure value of the containment space V, the gas temperature and steam flow rate, and the speed candidates of the grate 61 of the drying section 21, the combustion section 22 and the post-combustion section 23 generated by the candidate generation unit 392 into the learned model stored in the model storage unit 391 to calculate the steam flow rate.

[0153] The first speed calculation unit 330 in the fourth embodiment calculates the first speed correction value based on the candidate generated by the candidate generation unit 392, which is the candidate whose difference between the measured value of steam flow rate and the value of steam flow rate calculated by the flow rate calculation unit 393 is smaller.

[0154] For example, in the fourth embodiment, the candidate generation unit 392 calculates the reference grate speed and reference damper opening for each of the drying section 21, the combustion section 22, and the post-combustion section 23 based on the combustion state of the combustion equipment 100. The candidate generation unit 392 generates multiple candidate grate speeds by adding a correction value based on a predetermined variation range to the reference grate speeds. The candidate generation unit 392 also generates multiple candidate damper openings by adding a correction value based on a predetermined variation range to the reference damper openings.

[0155] As state quantities representing the current state of the combustion equipment 100, the flow calculation unit 393 determines the burnout point Z determined by the point determination unit 320, the ignition point in the combustion section 22, the drying state of the drying section 21, the combustion state of the combustion section 22, the post-combustion state of the post-combustion section 23, the oxygen concentration, the lower heating value of the incinerated material 400, the pressure value of the containment space V, the gas temperature, and the steam flow rate. The flow calculation unit 393 uses the determined state quantities and the candidates for each control quantity generated by the candidate generation unit 392 to calculate the steam flow rate for each candidate control quantity. The first speed calculation unit 330 determines the grate speed involved in the control quantity candidate with the smallest difference between the steam flow rate calculated for each candidate control quantity and the measured steam flow rate as the first speed correction value.

[0156] In another embodiment, the generation of candidates and the determination of the first velocity correction value can be performed, for example, by a genetic algorithm or by generating candidates using random numbers. Furthermore, in another embodiment, the candidate generation unit 392 generates a candidate, and the first velocity calculation unit 330 updates the value of the candidate to reduce the difference in steam flow rates, thereby determining the first velocity correction value.

[0157] Furthermore, in another embodiment, the state variables input into the learned model for the combustion device 100 need to include at least the position of the burnout point Z, and other state variables can be appropriately changed. Also, the control variables input into the learned model need to include at least the speed of the grate 61 in each section, and other control variables can be appropriately changed.

[0158] Function / Effect

[0159] The control device 300 of the combustion device 100 according to the present invention includes: a model storage unit 391, which stores a learned model learned by using supervised learning of a dataset, the dataset consisting of input samples including the burnout point Z and the speed of the grate 61 in each section and output samples including the steam flow rate generated by drying in the incinerated material 400; a candidate generation unit 392, which generates speed candidates for the grate 61 in each section; and a flow rate calculation unit 393, which inputs the burnout point Z and the speed candidates for the grate 61 in each section into the learned model to calculate the steam flow rate, and a first speed calculation unit 330 calculates a first speed correction value based on the candidates generated by the candidate generation unit 392 whose difference between the measured value of the steam flow rate and the value of the steam flow rate calculated by the flow rate calculation unit 393 is smaller.

[0160] The user of the combustion device 100 can use a learned model generated from input samples including the burnout point Z and the speed of the grate 61 in each section to control the speed of the grate 61 and to stably carry out combustion in the combustion device 100.

[0161] <Fifth Implementation>

[0162] The combustion apparatus 100 according to the fifth embodiment will be described below. In addition to the control described in the first embodiment, the combustion apparatus 100 according to the fifth embodiment also determines the position of the flame F to control the secondary air pipeline L2, thereby changing the temperature of the drying section 21.

[0163] Figure 12 This is a flowchart illustrating the structure of the control device 300 according to the fifth embodiment. In addition to the control device 300 of the first embodiment, the control device 300 of the fifth embodiment also includes a flame determination unit 394, a temperature determination unit 395, a secondary air calculation unit 396, and a second secondary air control unit 397.

[0164] The flame determination unit 394 determines the position of the flame F based on the processed image acquired by the acquisition unit 310. For example, based on determining the combustion area according to the brightness of the processed image, the flame determination unit 394 determines the point in the area that minimizes the distance to the drying section 21 as the ignition point, and determines the ignition point as the position of the flame F.

[0165] The temperature determination unit 395 determines the temperature of the combusted material 400 in the drying section 21 based on the processed image acquired by the acquisition unit 310. For example, the temperature determination unit 395 checks the average brightness of the area corresponding to the drying section 21 in the processed image with information related to brightness and temperature to determine the temperature of the combusted material 400 in the drying section 21.

[0166] The secondary air calculation unit 396 calculates the amount of secondary air and the supply angle of the secondary air to minimize the difference between the temperature determined by the temperature determination unit 395 and the preset value, based on the position of the flame F determined by the flame determination unit 394. The secondary air calculation unit 396 performs the calculations through the following operations.

[0167] The secondary air calculation unit 396 receives the position of the flame F (i.e., the ignition point) determined by the flame determination unit 394 and the temperature determined by the temperature determination unit 395. The secondary air calculation unit 396 subtracts the received temperature from a preset value to calculate the temperature difference.

[0168] The secondary air calculation unit 396 determines whether the temperature of the drying section 21 determined by the temperature determination unit 395 is lower than the target temperature of the drying section 21 by a predetermined temperature difference or more. Furthermore, the secondary air calculation unit 396 determines whether the position of the flame F determined by the flame determination unit 394 is located at the rear end of the drying section 21. If the temperature of the drying section 21 is lower than the target temperature by a predetermined temperature difference or more and the position of the flame F is located at the rear end of the drying section 21, the secondary air calculation unit 396 calculates the amount and angle of secondary air to bring the flame position closer to the drying section 21. For example, the secondary air calculation unit 396 stores the amount and angle of secondary air used to bring the flame closer to the drying section 21 in association with the predetermined position of the flame F, and reads the amount and angle of secondary air associated with the flame position determined by the flame determination unit 394, thereby enabling the calculation of the amount and angle of secondary air.

[0169] The second secondary air control unit 397 controls the secondary air pipeline L2 based on the amount and supply angle of the secondary air calculated by the secondary air calculation unit 396. That is, the second secondary air control unit 397 controls the opening angle of the shock absorber so that the amount and supply angle of the secondary air supplied to the secondary air pipeline L2 are the same as the amount and supply angle of the secondary air calculated by the secondary air calculation unit 396.

[0170] Function / Effect

[0171] In the control device 300 of the combustion device 100 according to the present invention, the combustion device 100 includes a secondary air pipe L2 that supplies air from above the grate 61. The control device 300 of the combustion device 100 includes: a flame determination unit 394 that determines the position of the flame F based on a processed image; a temperature determination unit 395 that determines the temperature of the incinerated material 400 in the section based on the processed image; a secondary air calculation unit 396 that calculates the amount of secondary air and the supply angle of the secondary air to minimize the difference between the temperature and a preset value based on the position of the flame F; and a second secondary air control unit 397 that controls the secondary air pipe L2 based on the calculated amount and the supply angle.

[0172] The user of the combustion device 100 can control the amount and supply angle of secondary air according to the position of the flame F, thus changing the way the flame F is brought closer to the drying section 21 and being able to stably process the incinerated material 400 in the section.

[0173] <Other Implementation Methods>

[0174] The above description, with reference to the accompanying drawings, details one embodiment. However, the specific structure is not limited to the structure described above, and various design changes are possible.

[0175] The control device 300 of the combustion equipment 100 can control the drying section 21, the combustion section 22, and the after-combustion section 23 individually. For example, it can control only the drying section 21, or control the drying section 21, the combustion section 22, and the after-combustion section 23 all at once. Furthermore, it can assign priority to control multiple air boxes 2 in the drying section 21, the combustion section 22, and the after-combustion section 23.

[0176] Figure 13 It is a schematic block diagram showing the structure of a computer according to at least one embodiment.

[0177] Computer 1100 has a processor 1110, main memory 1120, storage 1130 and interface 1140.

[0178] The aforementioned control device 300 is installed in the computer 1100. Furthermore, the operations of each of the aforementioned processing units are stored in the memory 1130 as programs. The processor 1110 reads the program from the memory 1130 and expands it to the main memory 1120, and executes the aforementioned processing according to the program. Additionally, the processor 1110 secures the corresponding storage area in the main memory 1120 according to the program.

[0179] The program can be used to implement a portion of the functions performed by the computer 1100. For example, the program can function by combining with other programs stored in the memory 1130 or with other programs installed in other devices. Additionally, in other embodiments, the computer 1100 may, in addition to or instead of the above-described structure, include a custom LSI (Large Scale Integrated Circuit) such as a PLD (Programmable Logic Device). Examples of PLDs include PAL (Programmable Array Logic), GAL (Generic Array Logic), CPLD (Complex Programmable Logic Device), and FPGA (Field Programmable Gate Array). In this case, some or all of the functions implemented by the processor 1110 can be implemented by this integrated circuit.

[0180] Examples of memory 1130 include disks, optical disks, and semiconductor memory. Memory 1130 can be an internal medium directly connected to the bus of computer 1100, or an external medium connected to the computer via interface 1140 or a communication line. Furthermore, when the program is allocated to computer 1100 via the communication line, the computer 1100, upon receiving the allocation, expands the program to main memory 1120 and can execute the aforementioned processing. In at least one embodiment, memory 1130 is a non-transitory tangible storage medium.

[0181] Furthermore, the program can be used to implement a portion of the aforementioned functions. Additionally, the program can be a so-called differential file (differential program) implemented by combining the aforementioned functions with other programs already stored in memory 1130.

[0182] <Postscript>

[0183] The control device 300 of the combustion device 100 described in each embodiment is as follows.

[0184] (1) In the control device 300 of the combustion device 100 according to the present invention, the combustion device 100 includes: a furnace body 10, which defines a processing space V; a grate 61, which transports the incinerated material 400 in the processing space V along the transport direction Da; and a bellows 2, which supplies air to the processing space V. The control device 300 of the combustion device 100 includes: an image acquisition unit, which acquires and captures a processing image of a segment of the processing space V divided along the transport direction Da; a point determination unit 320, which determines, based on the processing image, the end of the flame F generated by the combustion of the incinerated material 400 in the transport direction rearward, i.e., the burnout point Z; a first speed calculation unit 330, which calculates the speed correction value of the grate 61 in the segment, i.e., the first speed correction value, based on the burnout point Z; and a speed control unit 360, which controls the speed of the grate 61 in the segment based on the first speed correction value.

[0185] The user of the combustion device 100 can control the speed of the grate 61 according to the determined burnout point Z, thus enabling the incinerated material 400 to burn stably in the combustion device 100.

[0186] (2) Furthermore, the processing space V of the control device 300 of the combustion equipment 100 is divided into a drying section 21, a combustion section 22 and a post-combustion section 23 from the upstream side of the conveying direction Da. The image acquisition unit acquires the processed images of the drying section 21, the combustion section 22 and the post-combustion section 23. The first speed calculation unit 330 calculates the first speed correction value of each of the drying section 21, the combustion section 22 and the post-combustion section 23. The speed control unit 360 controls the speed of the grate 61 of the drying section 21, the combustion section 22 and the post-combustion section 23 according to each of the first speed correction values.

[0187] The user of the combustion device 100 can control the speed of the grate 61 according to the determined burnout point Z, thus enabling the incinerated material 400 to be stably dried, burned, and post-burned in the combustion device 100.

[0188] (3) Furthermore, the control device 300 of the combustion device 100 includes: a first air volume calculation unit 340, which calculates a correction value for the amount of air supplied to each section, namely the first air volume correction value, based on the burnout point Z; and an air volume control unit 370, which controls the amount of air supplied to each section by the bellows 2 based on the first air volume correction value.

[0189] The user of the combustion device 100 can control the air box 2 according to the determined burnout point Z, thus enabling the incinerated material 400 to be stably dried, burned, and post-burned in the combustion device 100.

[0190] (4) The control device 300 of the combustion device 100 according to the present invention includes: a load value determination unit 380, which determines a value representing the load state of each section, i.e., a load value, based on at least one of the brightness of the processed image, the moisture content of the incinerated material 400, and the lower heating value of the incinerated material 400; a second speed calculation unit 381, which calculates a speed correction value of the grate 61 of each section, i.e., a second speed correction value, based on the difference between a preset value and the load value; and a second speed control unit 383, which controls the speed of the grate 61 of each section based on the second speed correction value.

[0191] The user of the combustion device 100 can control the speed of the grate 61 according to the determined load value, thus enabling the incinerated material 400 to burn stably in the combustion device 100.

[0192] (5) The control device 300 of the combustion device 100 according to the present invention includes: a second air volume calculation unit 382, ​​which calculates the correction value of the air volume supplied by the bellows 2 to each section, i.e., the second air volume correction value, based on the difference between a preset value and a load value; and a second air volume control unit 384, which controls the air volume supplied by the bellows 2 to each section based on the second air volume correction value.

[0193] The user of the combustion device 100 can control the bellows 2 according to the determined load value, thus enabling the incinerated material 400 to burn stably in the combustion device 100.

[0194] (6) In the control device 300 of the combustion device 100 according to the embodiment of the present invention, the combustion device 100 further includes a secondary air pipe L2 that supplies air from above the grate 61. The control device 300 of the combustion device 100 includes: a quantity determination unit 385 that determines the quantity of the incinerated material 400 flowing into the section based on the processed image; a quantity determination unit 386 that determines whether the determined quantity is greater than or equal to a preset value; and a secondary air control unit 387 that controls the amount of air supplied by the secondary air pipe L2 based on the determination.

[0195] The user of the combustion device 100 can also control the amount of air supplied from the secondary air pipeline L2 according to the amount of the incinerated material 400, and can use the air to stably maintain the combustion state of the incinerated material 400.

[0196] (7) The control device 300 of the combustion device 100 according to the present invention includes: a model storage unit 391, which stores a learned model learned by using supervised learning of a dataset, the dataset consisting of input samples including the burnout point Z and the speed of the grate 61 in each section and output samples including the steam flow rate generated by drying in the incinerated material 400; a candidate generation unit 392, which generates speed candidates of the grate 61 in each section; and a flow rate calculation unit 393, which inputs the burnout point Z and the speed candidates of the grate 61 in each section into the learned model to calculate the steam flow rate, and a first speed calculation unit 330 calculates a first speed correction value based on the candidates generated by the candidate generation unit 392 whose difference between the measured value of the steam flow rate and the value of the steam flow rate calculated by the flow rate calculation unit 393 is smaller.

[0197] The user of the combustion device 100 can use a learned model generated from input samples including the burnout point Z and the speed of the grate 61 in each section to control the speed of the grate 61 and to stably carry out combustion in the combustion device 100.

[0198] (8) In the control device 300 of the combustion device 100 according to the present invention, the combustion device 100 includes a secondary air pipe L2 that supplies air from above the grate 61. The control device 300 of the combustion device 100 includes: a flame determination unit 394 that determines the position of the flame F based on a processed image; a temperature determination unit 395 that determines the temperature of the incinerated material 400 in the section based on the processed image; a secondary air calculation unit 396 that calculates the amount of secondary air and the supply angle of the secondary air to minimize the difference between the temperature and a preset value based on the position of the flame F; and a second secondary air control unit 397 that controls the secondary air pipe L2 based on the calculated amount and the supply angle.

[0199] The user of the combustion device 100 can control the amount and supply angle of secondary air according to the position of the flame F, thus changing the way the flame F is brought closer to the drying section 21 and being able to stably process the incinerated material 400 in the section.

[0200] (9) In the control method of the combustion device according to the present invention, the combustion device 100 includes: a furnace body 10, which defines a processing space V; a grate 61, which transports the incinerated material 400 in the processing space V along the transport direction Da; and a bellows 2, which supplies air to the processing space V. The control device 300 of the combustion device 100 has the following steps: acquiring a processing image of a segment of the processing space V divided along the transport direction Da; determining, based on the processing image, the end of the flame F generated by the combustion of the incinerated material 400 in the transport direction rearward, i.e., the burnout point Z; calculating, based on the burnout point Z, a speed correction value of the grate 61 of the segment, i.e., a first speed correction value; and controlling, based on the first speed correction value, the speed of the grate 61 of the segment.

[0201] The user of the control method of the combustion device 100 can control the speed of the grate 61 according to the determined burnout point Z, thereby enabling the incinerated material 400 to burn stably in the combustion device 100.

[0202] (10) The program of the combustion device 100 involved in the present invention is the program of the control device 300 of the combustion device 100. The combustion device 100 includes: a furnace body 10, which defines a processing space V; a grate 61, which transports the incinerated material 400 in the processing space V along the transport direction Da; and a bellows 2, which supplies air to the processing space V. The program causes a computer to perform the following steps: acquire a processing image of a segment of the processing space V divided along the transport direction Da; determine the end of the flame F generated by the combustion of the incinerated material 400 in the transport direction, i.e., the burnout point Z, based on the processing image; calculate the speed correction value of the grate 61 of the segment, i.e., the first speed correction value, based on the burnout point Z; and control the speed of the grate 61 of the segment based on the first speed correction value.

[0203] The user of the combustion device 100 program can control the speed of the grate 61 according to the determined burnout point Z, thus enabling the incinerated material 400 to burn stably in the combustion device 100.

[0204] Industrial availability

[0205] According to the control device, control method and program of the combustion equipment of the present invention, the incinerated material can be stably burned in the combustion equipment.

[0206] Symbol Explanation

[0207] 1-Coal feeder, 2-Blowbox, 3-Hopper, 4-Gas circulation unit, 6-Coal feeder, 7-Furnace, 8-Waste heat recovery boiler, 9-Cooling tower, 10-Furnace body, 11-Dust collection device, 12-Chimney, 13-Discharge chute, 21-Drying section, 22-Combustion section, 23-After-combustion section, 31-Feeder, 61-Grate, 61A-Fixed grate, 61B-Movable grate, 100-Combustion equipment, 300-Control device, 310-Acquisition unit, 320-Point determination unit, 330-First speed calculation unit, 340-First air volume calculation unit, 350-Flow rate concentration calculation unit, 360-Speed ​​control unit, 370-Air volume control unit, 379-Judgment unit, 380-Load value determination unit, 381-Second Speed ​​calculation unit, 382-Second air volume calculation unit, 383-Second speed control unit, 384-Second air volume control unit, 385-Quantity determination unit, 386-Quantity judgment unit, 387-Secondary air control unit, 390-Model generation unit, 391-Model storage unit, 392-Candidate generation unit, 393-Flow calculation unit, 394-Flame determination unit, 395-Temperature determination unit, 396-Secondary air calculation unit, 397-Secondary secondary air control unit, 400-Incinerated material, 1100-Computer, 1110-Processor, 1120-Main memory, 1130-Memory, 1140-Interface, L1-Primary air pipeline, L2-Secondary air pipeline, B1-Blower, F-Flame, Z-Ignition point.

Claims

1. A control device for a combustion apparatus, the combustion apparatus comprising: a furnace body defining a processing space; a grate conveying a material to be burned along a conveying direction within the processing space; and an air box supplying air to the processing space, the control device of the combustion apparatus comprising: The image acquisition unit acquires processed images of multiple segments of the processing space divided along the transport direction. The point determination unit determines, based on the processed image, the end of the flame generated by the combustion of the incinerated material on the rear side of the conveying direction, i.e., the burnout point; The first speed calculation unit calculates the difference between the burnout point and the reference burnout point associated with each of the sections, performs PID calculation on the difference, and calculates the speed correction value of the grate in each of the sections, i.e., the first speed correction value. The speed control unit controls the speed of the grate in the section based on the first speed correction value; The load value determination unit determines a value, i.e., a load value, representing the load state of each segment based on the brightness of the processed image. The second speed calculation unit calculates the difference between the preset value and the load value, and performs PID calculation on the difference to calculate the speed correction value of the grate in each section, i.e., the second speed correction value. The second speed control unit controls the speed of the grate in each of the sections based on the second speed correction value. The first air volume calculation unit calculates the difference between the burnout point and the reference burnout point associated with each of the sections, performs PID calculation on the difference, and calculates the correction value of the air volume supplied to each of the sections, namely the first air volume correction value. The flow concentration calculation unit calculates the difference by dividing the steam flow rate in the processing space measured by the measurement unit by the reference steam flow rate, and calculates the steam flow rate correction value by multiplying the difference by a weight associated with the steam flow rate. It also calculates the difference by dividing the oxygen concentration in the processing space measured by the measurement unit by the reference oxygen concentration, and calculates the oxygen concentration correction value by multiplying the difference by a weight associated with the oxygen concentration. Finally, it calculates a basic correction value by adding the steam flow rate correction value and the oxygen concentration correction value, which is used as the correction value for the amount of air supplied to each of the sections. and The air volume control unit controls the amount of air supplied by the bellows to each of the sections based on the first air volume correction value and the basic correction value.

2. The control device for the combustion equipment according to claim 1, wherein, The processing space is divided into sections, starting from the upstream side of the conveying direction, which are a drying section, a combustion section, and a post-combustion section. The image acquisition unit acquires processed images of the drying section, the combustion section, and the post-combustion section. The first speed calculation unit calculates the first speed correction value for each of the drying section, the combustion section, and the post-combustion section. The speed control unit controls the speed of the grate in the drying section, the combustion section, and the post-combustion section according to each of the first speed correction values.

3. The control device for the combustion equipment according to claim 1, comprising: The second air volume calculation unit calculates a correction value, i.e., a second air volume correction value, for the air volume supplied by the bellows to each of the sections based on the difference between a preset value and the load value; and The second air volume control unit controls the amount of air supplied by the bellows to each of the sections based on the second air volume correction value.

4. The control device for the combustion equipment according to claim 1 or 2, wherein, The combustion equipment also includes a secondary air pipeline for supplying air from above the grate, and the control device of the combustion equipment includes: The quantity determination unit determines the amount of the incinerated material flowing into the section based on the processed image; The quantity determination unit determines whether the determined quantity is greater than or equal to a preset value. and The secondary air control unit controls the amount of air supplied by the secondary air pipeline based on the determined information.

5. The control device for the combustion equipment according to claim 1 or 2, comprising: The model storage unit stores a learned model that has been learned through supervised learning using a dataset, which consists of input samples including the burnout point and the velocity of the grate in each of the respective sections, and output samples including the steam flow rate in the incinerated material due to drying. The candidate generation unit generates candidate velocities for each of the aforementioned sections of the grate; and The flow calculation unit inputs the burnout point and the candidate velocities of the grate in each of the aforementioned sections into the learned model to calculate the steam flow rate. The first speed calculation unit calculates the first speed correction value based on the speed candidates generated by the candidate generation unit that reduce the difference between the measured value of steam flow and the value of steam flow calculated by the flow calculation unit.

6. The control device for the combustion equipment according to claim 1 or 2, wherein, The control device of the combustion equipment includes a secondary air pipeline for supplying secondary air from above the grate, and the control device of the combustion equipment includes: The flame determination unit determines the position of the flame based on the processed image; The temperature determination unit determines the temperature of the incinerated material in the section based on the processed image; The secondary air calculation unit calculates, based on the position of the flame, the amount of secondary air and the air supply angle that minimize the difference between the temperature and a preset value; and The second secondary air control unit controls the secondary air pipeline based on the calculated amount and supply angle.

7. A method for controlling a combustion device, the combustion device comprising: a furnace body defining a processing space; a grate conveying a substance to be burned along a conveying direction within the processing space; and an air box supplying air to the processing space, the method comprising the following steps: Acquire processed images of multiple segments of the processing space divided along the conveying direction; Based on the processed image, the end of the flame generated by the combustion of the incinerated material in the direction of transport, i.e., the burnout point, is determined. Calculate the difference between the burnout point and the reference burnout point associated with each of the sections, and perform PID calculation on the difference to calculate the speed correction value of the grate for each of the sections, i.e., the first speed correction value. The speed of the grate in the section is controlled according to the first speed correction value; Based on the brightness of the processed image, a value representing the load state of each segment, i.e., the load value, is determined; Calculate the difference between the preset value and the load value, and perform PID calculation on the difference to calculate the speed correction value of the grate in each section, i.e., the second speed correction value. The speed of the grate in each of the aforementioned sections is controlled according to the second speed correction value. Calculate the difference between the burnout point and the reference burnout point associated with each of the sections, and perform PID calculation on the difference to calculate the correction value of the air volume supplied to each of the sections, namely the first air volume correction value. The difference is calculated by dividing the steam flow rate in the processing space measured by the measuring unit by the reference steam flow rate, and the difference is multiplied by a weight associated with the steam flow rate to calculate the steam flow rate correction value. The difference is calculated by dividing the oxygen concentration in the processing space measured by the measuring unit by the reference oxygen concentration, and the difference is multiplied by a weight associated with the oxygen concentration to calculate the oxygen concentration correction value. A basic correction value is calculated by adding the steam flow rate correction value and the oxygen concentration correction value, and used as the correction value for the amount of air supplied to each of the sections. and The amount of air supplied by the bellows to each of the sections is controlled based on the first air volume correction value and the basic correction value.

8. A program product comprising a program that causes a computer of a control device for a combustion apparatus to execute the following steps: the combustion apparatus includes: a furnace body defining a processing space; a grate conveying material to be burned in the processing space along a conveying direction; and an air box supplying air to the processing space, the steps being: Acquire processed images of multiple segments of the processing space divided along the conveying direction; Based on the processed image, the end of the flame generated by the combustion of the incinerated material in the direction of transport, i.e., the burnout point, is determined. Calculate the difference between the burnout point and the reference burnout point associated with each of the sections, and perform PID calculation on the difference to calculate the speed correction value of the grate for each of the sections, i.e., the first speed correction value. The speed of the grate in the section is controlled according to the first speed correction value; Based on the brightness of the processed image, a value representing the load state of each segment, i.e., the load value, is determined; Calculate the difference between the preset value and the load value, and perform PID calculation on the difference to calculate the speed correction value of the grate in each section, i.e., the second speed correction value. The speed of the grate in each of the aforementioned sections is controlled according to the second speed correction value. Calculate the difference between the burnout point and the reference burnout point associated with each of the sections, and perform PID calculation on the difference to calculate the correction value of the air volume supplied to each of the sections, namely the first air volume correction value. The difference is calculated by dividing the steam flow rate in the processing space measured by the measuring unit by the reference steam flow rate, and the difference is multiplied by a weight associated with the steam flow rate to calculate the steam flow rate correction value. The difference is calculated by dividing the oxygen concentration in the processing space measured by the measuring unit by the reference oxygen concentration, and the difference is multiplied by a weight associated with the oxygen concentration to calculate the oxygen concentration correction value. A basic correction value is calculated by adding the steam flow rate correction value and the oxygen concentration correction value, and used as the correction value for the amount of air supplied to each of the sections. and The amount of air supplied by the bellows to each of the sections is controlled based on the first air volume correction value and the basic correction value.

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