JP2022071891A - Furnace interior image creating method, furnace interior situation determining method and combustion situation evaluating method - Google Patents

Abstract

To provide a combustion furnace which is low cost in comparison with a structure in which multiple cameras are utilized and which can appropriately grasp the position of an object in the furnace.SOLUTION: A furnace interior image creating method includes a visible image obtaining step and a three-dimensional image creating step. In the visible image obtaining step, frame and at least a waste piled up on a drying unit 11 are monitored using a single visible light camera 95, thereby obtaining a visible image. In the three-dimensional image creating step, by performing a distance measuring on the visible image obtained in the visible image obtaining step by utilizing the lens aberration, distance information representing a distance to the object within the visible image is formed, and three-dimensional images are continuously created on the basis of such distance information.SELECTED DRAWING: Figure 1

Description

The present invention mainly relates to a method for grasping the state inside a grate-type incinerator that incinerates waste while transporting it by a grate.

Conventionally, since a wide variety of wastes are put into a waste incinerator, it is important to be able to appropriately maintain stable combustion even when the properties of the put wastes change. In addition, the grate-type waste incinerator is divided into a drying part that dries the waste, a combustion part that burns the waste with flame, and a post-combustion part that burns the waste afterwards (Oki combustion). There is. In order to perform combustion control that properly maintains stable combustion, it is important to fully understand the conditions inside the furnace.

Patent Document 1 discloses an incinerator in which a plurality of image pickup devices having different viewpoints are arranged on a side wall portion of a drying portion to photograph the inside of the furnace and acquire an image. In this incinerator, a three-dimensional image is continuously created by performing image composition processing on the image acquired by the image pickup device, and the flame combustion start position is determined based on the flame included in the created three-dimensional image. A configuration for specifying and determining whether the flame combustion start position is moving to the upstream side in the transport direction or the downstream side in the transport direction is disclosed.

Patent Document 2 discloses an incinerator in which an infrared camera is arranged on the ceiling of the drying portion to acquire a thermal image of waste in the drying portion. Since this infrared camera is equipped with a filter having a transmission wavelength of about 3.9 μm, a thermal image excluding the infrared rays emitted by the flame is created. In addition, Patent Document 2 discloses a configuration in which an infrared camera equipped with this filter and an infrared camera not equipped with this filter are used to acquire thermal images, respectively.

Japanese Unexamined Patent Publication No. 2019-219094 Japanese Patent No. 3315036

In Patent Document 1, it is necessary to arrange and operate a plurality of image pickup devices having different viewpoints. Here, regarding the shooting in the furnace, the cost of constructing the shooting window (cost of heat countermeasures, cost of forming the shooting window) is large, and heat dissipation that cannot be recovered through the shooting window may increase. .. Therefore, the method of constructing a plurality of photographing windows in order to create a three-dimensional image in a plurality of furnaces has been desired to be improved in terms of cost.

In Patent Document 2, an infrared camera equipped with a filter mainly contains information other than flame (that is, waste), while an infrared camera not equipped with a filter mainly contains information related to flame. Therefore, it is difficult to identify the three-dimensional position of the object in the furnace even by comparing these two thermal images.

The present invention has been made in view of the above circumstances, and its main purpose is to provide an incinerator that can accurately grasp the position of an object in the furnace at a low cost as compared with a configuration using a plurality of cameras. To provide.

The problem to be solved by the present invention is as described above, and next, the means for solving this problem and its effect will be described.

From the viewpoint of the present invention, the following method for creating an in-fire image is provided. That is, the incinerator for which the in-furnace image creation method is performed is divided into a drying part, a combustion part, and a post-combustion part, and the waste is transported by operating intermittently in a state where the waste is accumulated. Equipped with a grate. The in-furnace image creating method includes a visible image acquisition step and a three-dimensional image creating step. In the visible image acquisition step, a visible light camera is used to observe the flame and at least the waste deposited on the dry portion to acquire a visible image. In the three-dimensional image creation step, distance measurement using lens aberration is performed on the visible image acquired in the visible image acquisition step to construct distance information indicating the distance to an object included in the visible image. , Three-dimensional images are continuously created based on the distance information.

Thereby, by utilizing the lens aberration, the distance to the object can be specified by using the image taken by one visible light camera. Therefore, a three-dimensional image can be created from an image taken by one visible light camera. As described above, the position of the object in the furnace can be accurately grasped without arranging a plurality of visible light cameras.

According to the present invention, the position of an object in the furnace can be accurately grasped at a low cost as compared with a configuration using a plurality of cameras.

The schematic block diagram of the waste incinerator including the incinerator of the object which performs the method of this invention. Functional block diagram of the incinerator. A three-dimensional schematic diagram of an incinerator showing the mounting position of a visible light camera. A flowchart showing the control performed by the control device to stabilize combustion. The schematic diagram which shows the state which waste is transported and the value calculated by a control device. A schematic configuration diagram of a waste incinerator showing the state when the flame combustion start position moves to the upstream side. Schematic block diagram of a waste incinerator showing the state when the flame combustion start position moves to the downstream side. A flowchart showing a part of the control performed by the control device to stabilize the combustion. A flowchart showing the rest of the control performed by the controller to stabilize combustion. A perspective view showing the thickness of waste, the speed of surface movement, and the mesh division. The figure explaining the thickness progress information. The figure explaining the volume flow rate progress information. The plan view explaining the judgment result about the combustion start possible state and the flame generation start position, and the combustion start evaluation position.

<Overall Configuration of Waste Incinerator> First, the waste incinerator (waste incinerator) 100 including the incinerator (waste incinerator) 10 of the first embodiment will be described with reference to FIG. 1. FIG. 1 is a schematic configuration diagram of a waste incinerator 100 including an incinerator 10 for performing the method of the present invention. In the following description, the terms "upstream" and "downstream" mean upstream and downstream in the direction in which waste, combustion gas, exhaust gas, primary air, secondary air, circulating exhaust gas, etc. flow.

As shown in FIG. 1, the waste incinerator 100 includes an incinerator 10, a boiler 30, and a steam turbine power generation facility 35. The incinerator 10 incinerates the supplied waste. The detailed configuration of the incinerator 10 will be described later.

The boiler 30 uses the heat generated by the combustion of waste to generate steam. The boiler 30 generates steam (superheated steam) by exchanging heat between water and the high-temperature combustion gas generated in the furnace with a large number of water pipes 31 and superheater pipes 32 provided on the flow path wall. The steam generated in the water pipe 31 and the superheater pipe 32 is supplied to the steam turbine power generation facility 35.

The steam turbine power generation facility 35 includes a turbine and a power generation device (not shown). The turbine is rotationally driven by steam supplied from the water pipe 31 and the superheater pipe 32. The power generation device uses the rotational driving force of the turbine to generate electricity.

Here, in order to generate stable power generation, it is necessary to stabilize the amount of steam (superheated steam) produced in the boiler 30. In order to stabilize the amount of steam (superheated steam) generated in the boiler 30, it is necessary to stabilize the heat input to the boiler 30. That is, in order to keep the amount of power generation constant, it is necessary to stabilize the amount of heat possessed by the combustion gas supplied from the incinerator 10 to the boiler 30 and keep the heat input to the boiler 30 stable.

<Structure of Incinerator 10> The incinerator 10 includes a dust supply device 40 for supplying waste into the furnace. The dust supply device 40 includes a waste input hopper 41 and a dust supply device main body 42. The waste input hopper 41 is a portion where waste is input from outside the furnace. The dust supply device main body 42 is located at the bottom of the waste input hopper 41 and is configured to be movable in the horizontal direction. The dust supply device main body 42 supplies the waste charged into the waste input hopper 41 to the downstream side. The movement speed of the dust supply device main body 42, the number of movements per unit time, the movement amount (stroke), and the position of the stroke end (movement range) are controlled by the control device 90. The dust supply device may be of a type that moves at a slight angle with respect to the horizontal direction.

The waste supplied into the furnace by the dust supply device 40 is supplied by the transport unit 20 in the order of the drying unit 11, the combustion unit 12, and the post-combustion unit 13. The transport unit 20 is composed of a dry grate 21 provided in the drying unit 11, a combustion grate 22 provided in the combustion unit 12, and a post-combustion grate 23 provided in the post-combustion unit 13. There is. Therefore, the transport unit 20 is composed of a plurality of stages of grate. Each grate is provided on the bottom of each part, and waste is placed on it.

The grate is composed of a movable grate and a fixed grate arranged side by side in the waste transport direction, and the movable grate operates in the order of forward, stop, reverse, stop, etc. to dispose of waste. It can be transported to the downstream side and the waste can be agitated. By increasing (decelerating) the operating speed of the movable grate, it is possible to increase (decelerate) the transport speed of waste. Further, by shortening (longening) the stop time of the movable grate, it is possible to increase (decelerate) the transport speed of waste. In addition, the grate is arranged side by side with a gap large enough for gas to pass through.

The drying unit 11 is a portion for drying the waste supplied to the incinerator 10. The waste of the drying unit 11 is dried by the primary air supplied from under the drying grate 21 and the radiant heat of combustion in the adjacent combustion unit 12. At that time, thermal decomposition gas is generated from the waste of the drying portion 11 by thermal decomposition. Further, the waste of the drying unit 11 is conveyed toward the combustion unit 12 by the drying grate 21.

The combustion unit 12 is a portion that mainly burns the waste dried by the drying unit 11. In the combustion unit 12, waste mainly causes flame combustion to generate a flame. The waste in the combustion unit 12, the ash generated by combustion, and the unburned material that cannot be completely burned are conveyed toward the post-combustion unit 13 by the combustion grate 22. Further, the combustion gas and the flame generated in the combustion unit 12 pass through the throttle unit 17 and flow toward the post-combustion unit 13. The combustion grate 22 is provided at the same height as the dry grate 21, but may be provided at a position lower than the dry grate 21.

The post-combustion unit 13 is a unit that burns the waste (unburned material) that could not be completely burned by the combustion unit 12. In the post-combustion unit 13, the radiant heat of the combustion gas and the primary air promote the combustion of the unburned material that could not be completely burned in the combustion unit 12. As a result, most of the unburned matter becomes ash, and the unburned matter decreases. The ash generated in the post-combustion unit 13 is conveyed toward the chute 24 by the post-combustion grate 23 provided on the bottom surface of the post-combustion unit 13. The ash conveyed to the chute 24 is discharged to the outside of the waste incinerator 100. Although the rear combustion grate 23 of the present embodiment is provided at a position lower than the combustion grate 22, it may be provided at the same height as the combustion grate 22.

As described above, since the reactions that occur in the drying unit 11, the combustion unit 12, and the post-combustion unit 13 are different, each wall surface or the like is configured according to the reaction that occurs. For example, since flame combustion occurs in the combustion unit 12, a structure having a higher refractory level than the drying unit 11 is adopted.

The reburning unit 14 is a portion for burning the unburned gas contained in the combustion gas. The re-combustion unit 14 extends upward from the drying unit 11, the combustion unit 12, and the post-combustion unit 13, and secondary air is supplied in the middle thereof. As a result, the combustion gas is mixed and stirred with the secondary air, and the unburned gas contained in the combustion gas is burned in the reburning unit 14. The combustion generated in the combustion unit 12 and the post-combustion unit 13 is referred to as primary combustion, and the combustion generated in the recombustion unit 14 (that is, the combustion of the unburned gas remaining in the primary combustion) is referred to as secondary combustion.

The gas supply device 50 is a device that supplies gas into the furnace. The gas supply device 50 of the present embodiment has a primary air supply unit 51, a secondary air supply unit 52, and an exhaust gas supply unit 53. Each supply unit is composed of a blower for attracting or sending out gas.

In the present specification, the gas supplied for primary combustion is referred to as a primary combustion gas. The gas for primary combustion includes primary air, circulating exhaust gas, and a mixed gas thereof. The primary air is air taken in from the outside and is not used for combustion or the like (that is, excluding circulating exhaust gas). Therefore, the primary air also includes a gas obtained by heating the air taken in from the outside. Similarly, in the present specification, the gas supplied for secondary combustion is referred to as a secondary combustion gas. The gas for secondary combustion includes secondary air, circulating exhaust gas, and a mixed gas thereof. The definition of secondary air is similar to that of primary air.

The primary air supply unit 51 supplies the primary air into the furnace via the primary air supply path 71. The primary air supply path 71 is branched into a first supply path 71a, a second supply path 71b, and a third supply path 71c. A heater may be provided in the primary air supply path 71 so that the temperature of the primary air supplied to each part can be adjusted.

The first supply path 71a is a path for supplying primary air to the drying step air box 25 provided below the drying grate 21. A first damper 81 is provided in the first supply path 71a, and the supply amount of the primary air supplied to the dry stage air box 25 can be adjusted. Further, the first damper 81 is controlled by the control device 90.

The second supply path 71b is a path for supplying primary air to the combustion stage air box 26 provided below the combustion grate 22. A second damper 82 is provided in the second supply path 71b, and the supply amount of the primary air supplied to the combustion stage air box 26 can be adjusted. Further, the second damper 82 is controlled by the control device 90.

The third supply path 71c is a path for supplying primary air to the post-combustion stage air box 27 provided below the post-combustion grate 23. A third damper 83 is provided in the third supply path 71c, and the supply amount of the primary air supplied to the post-combustion stage air box 27 can be adjusted. Further, the third damper 83 is controlled by the control device 90.

The secondary air supply unit 52 supplies secondary air from the upper part (ceiling portion) to the air gas holding space 16 of the incinerator 10 via the secondary air supply path 72, and the combustion gas is discharged by the throttle portion 17. Secondary air is supplied to the portion that changes direction (near the throttle portion 17). Further, the secondary air supply path 72 is provided with a fourth damper 84 controlled by the control device 90, and the amount of secondary air supplied to each part can be adjusted.

The exhaust gas supply unit 53 supplies (recirculates) the exhaust gas discharged from the waste incinerator 100 into the furnace via the circulating exhaust gas supply path 73. The exhaust gas discharged from the waste incinerator 100 is purified by the filtration type dust collector 60, and a part of it is incinerated by the exhaust gas supply unit 53 from both side surfaces (front side and back side of the paper surface) of the combustion unit 12. It is supplied to the incinerator 10. The position where the exhaust gas is supplied is not particularly limited. For example, the exhaust gas may be supplied from above (ceiling portion) of the incinerator 10 or may be supplied from only one side surface. By supplying the exhaust gas to the incinerator 10, the oxygen concentration in the incinerator 10 is lowered, and the local excessive rise in the combustion temperature can be suppressed. As a result, the generation of NOx can be suppressed. The circulating exhaust gas supply path 73 is provided with a fifth damper 85 controlled by the control device 90, and the supply amount of the circulating exhaust gas can be adjusted.

As shown in FIGS. 1 and 2, the incinerator 10 is provided with a plurality of sensors for grasping a combustion state and the like. Specifically, an incinerator gas temperature sensor 91, an incinerator outlet gas temperature sensor 92, a CO gas concentration sensor 93, a NOx gas concentration sensor 94, and a visible light camera 95 are provided.

The gas temperature sensor 91 in the incinerator is arranged in the incinerator 10 (for example, downstream of the air gas holding space 16 and upstream of the post-combustion unit 13), detects the gas temperature in the incinerator, and controls the device 90. Output to. The incinerator outlet gas temperature sensor 92 is arranged near the outlet of the incinerator 10 (for example, downstream of the reburning unit 14 and upstream of the boiler 30), detects the incinerator outlet gas temperature, and sends it to the control device 90. Output. The CO gas concentration sensor 93 is arranged downstream of the dust collector 60, detects the CO gas concentration contained in the exhaust gas (CO gas concentration discharged from the incinerator), and outputs the CO gas concentration sensor 93 to the control device 90. The NOx gas concentration sensor 94 is arranged downstream of the dust collector 60, detects the NOx gas concentration contained in the exhaust gas (NOx gas concentration discharged from the incinerator), and outputs the NOx gas concentration sensor 94 to the control device 90.

In this embodiment, one visible light camera 95 is provided. The relative position of the visible light camera 95 is stored in advance. The visible light camera 95 may be a device whose main purpose is to continuously capture still images at appropriate intervals, or a device whose main purpose is to capture moving images. .. Since the image information obtained from the continuously acquired still images is equivalent to the image (moving image) information, any device has a function of acquiring the image.

The visible light camera 95 aims to acquire an image of a flame combustion start position and an image of waste mainly transported through a dry grate 21. Further, the visible light camera 95 is not an infrared camera for detecting temperature or the like, but a camera for acquiring an image of the appearance (color, brightness, etc.) of waste. Therefore, the image acquired by the visible light camera 95 is an image showing the color, brightness, and the like in the furnace as seen from the viewpoint of the visible light camera 95. The viewpoint indicates the position and orientation in which the visible light camera 95, which is a measuring instrument, is arranged. In the incinerator 10, it is assumed that drying is completed at the downstream end of the drying unit 11 to generate pyrolysis gas, and flame combustion is started at the upstream end of the combustion unit 12. However, depending on the properties of the supplied waste (for example, the amount of water contained in the waste and the flammability of the waste), drying is completed in the middle of the drying unit 11 and flame combustion is started or combustion is started. Even in the middle part of part 12, drying may not be completed and flame combustion may not start.

Therefore, in order to image the flame combustion start position, the imaging range of the visible light camera 95 includes images of the boundary between the drying unit 11 and the combustion unit 12 and the vicinity thereof. Further, in the present embodiment, in order to image the waste of the drying unit 11, the imaging range of the visible light camera 95 also includes the surface of the waste of the drying unit 11. More specifically, the imaging range of the visible light camera 95 of the present embodiment includes the area from the upstream end of the drying unit 11 to the center of the combustion unit 12 in the waste transport direction. The imaging range of the visible light camera 95 may be narrower or wider than that of the present embodiment. Further, the visible light camera 95 may have a configuration in which the imaging range of the image can be changed. In this case, the visible light camera 95 may be able to change the imaging range without stopping the incinerator 10. The visible light camera 95 is arranged at a position higher than the waste for the purpose of appropriately acquiring an image even when the accumulated amount of the waste is large. Therefore, the visible light camera 95 is arranged so as to be inclined toward the lower side. The visible light camera 95 may be arranged without being tilted.

As shown in FIG. 3, the direction perpendicular to the waste transport direction and the vertical direction (vertical direction) is referred to as a furnace width direction. The visible light camera 95 acquires an image from the side wall 11a, which is a wall portion formed at the end portion of the drying portion 11 in the furnace width direction. Specifically, one window portion 11b is provided on the side wall 11a, and the visible light camera 95 acquires an image through the window portion 11b. The window portion 11b is a portion for observing the inside of the furnace. Specifically, a part of the side wall 11a is opened and the opening is closed with transparent (including translucent) heat-resistant glass or the like. It is a part.

<Processing performed by the control device> The control device 90 is composed of a CPU, RAM, ROM, etc., performs various calculations, and controls the entire waste incinerator 100. Similarly, the image processing device 96 is composed of a CPU, RAM, ROM, and the like, and can perform processing (image composition processing) for creating a three-dimensional image based on the image acquired by the visible light camera 95. In the present embodiment, the control device 90 and the image processing device 96 are separate hardware, but one piece of hardware may have the functions of both the control device 90 and the image processing device 96. Hereinafter, the combustion control performed by the control device 90, particularly the control performed by analyzing a three-dimensional image, will be described with reference to the flowchart of FIG. FIG. 4 is a flowchart showing the control performed by the control device 90 to stabilize the combustion.

First, the control device 90 stores a three-dimensional image created by the image processing device 96 based on the image acquired by the visible light camera 95 (S101). In this embodiment, a distance measurement technique utilizing known lens aberrations is used. Lens aberration is image blurring or color shift caused by the fact that when light emitted from one point of an object passes through a lens, it does not collect at one point but has a spread. By using the distance measurement technique using lens aberration, the distance to the object (subject) appearing in the acquired image can be calculated without using a stereo camera. Specifically, the following processing is performed. First, an aberration map of the visible light camera 95 is created. The aberration map is data in which the point image distribution function is associated with the distance of the subject to the lens and the position on the image. The point image distribution function is a function that expresses how wide the image is formed (that is, the shape and color of the blur) after the light from one point generated from the subject passes through the lens. For example, the point image distribution function is a function that divides the received light into RGB and describes the size of the image formation for each of them. Here, when the subject is in focus, the image of the subject on the image becomes smaller (the size of the blur becomes smaller), and the image of the subject on the image becomes larger as the subject moves away from the focus position (the image of the subject on the image becomes larger). The size of the blur increases). Also, when the subject is closer to the focus position, the outline of the subject image (bokeh) tends to be a mixture of red and blue (so-called purple fringing), and when the subject is farther than the focus position, the subject image (bokeh) The outline tends to turn green (so-called green fringe). Further, the size of the image (blurring) and the color of the outline of the image (blurring) depend on whether the image is in the center or the periphery of the image (that is, at which position of the image sensor the image is formed).

If there is an appropriate aberration map, the distance to the subject can be calculated based on the size and color of the image (blurring) of the subject. Aberration maps are created based on experimental data. Specifically, the aberration map is created by specifying the point image distribution function for each distance and for each position on the image while changing the distance to the subject. The aberration map may be created by aggregating the experimental data, but in the present embodiment, the experimental data is machine-learned to create the aberration map in order to create a more appropriate aberration map. Specifically, a model is created by learning the distance to the subject and the image of the subject acquired at the distance as inputs. When creating a model, learning is also performed using the position on the image as an input element. By creating the model as described above, it is possible to specify the distance to the subject for the subject appearing in each range of the image by inputting the actually acquired image. Hereinafter, the subject is referred to as an object. Further, the information indicating the distance of each object created as described above is referred to as distance information.

The image processing device 96 creates a three-dimensional image of the inside of the furnace by using the image acquired by the visible light camera 95 and the distance information. For example, the direction in which the object is located can be specified based on the image acquired by the visible light camera 95, and the distance to the object can be specified based on the distance information. In this way, the three-dimensional position of the object can be specified. Since a method of creating a three-dimensional image based on an image and a distance to an object appearing in the image is known, detailed description thereof will be omitted. In this embodiment, since there is only one visible light camera 95, there are circumstances such as the inability to specify the three-dimensional position of another object behind another object, and for all objects in the furnace. It is not possible to specify a detailed three-dimensional position. However, it is possible to create a three-dimensional image having enough information to apply the processing described later. The visible light camera 95 acquires an image at predetermined time intervals, and the image processing device 96 also creates a three-dimensional image using each image and outputs the image to the control device 90 accordingly.

Next, the control device 90 calculates (1) the time change of the thickness, (2) the time change of the moving speed of the surface, and (3) the residence time of the drying part for the waste of the drying part 11 (S102). ). Since these values are used to correct the control values of combustion control, these values are referred to as correction data.

Regarding (1) above, the thickness of the waste is the length along the vertical direction from the dry grate 21 to the surface of the waste, as shown in FIG. The position of the surface (upper surface) of the dry grate 21 is stored in advance in the control device 90 or the like. In addition, the position of the surface of the waste can be specified based on the three-dimensional image. Therefore, the thickness of the waste can be calculated by comparing these two positions (coordinates). Although it is possible to calculate the thickness of the waste according to both the transport direction and the furnace width direction (although the treatment may actually be performed), in the present embodiment, in order to simplify the treatment. , Calculate the thickness of the waste according to the transport direction only. If the thickness of the waste differs in the furnace width direction, the representative value is determined by using the average in the furnace width direction.

As described above, the distribution of the thickness of the waste in the drying portion 11 can be calculated according to the transport direction based on the three-dimensional image at a certain time. Since the three-dimensional images obtained by the image composition process are sequentially created according to the time, the thickness of the waste is similarly calculated for the three-dimensional image at the next time. In this way, the control device 90 calculates the time change of the thickness of the waste according to the transport direction and stores it in a predetermined storage unit.

The significance of calculating the time change of the thickness of waste is as follows. That is, the waste accumulated in the drying portion 11 is dried by evaporating the water contained in the waste along with the drying operation (feeding operation) of the drying grate 21, and the mass is reduced and the volume is also reduced. .. That is, the time change in the thickness of the waste indicates the progress of the drying of the waste, and is a kind of index of the progress of the drying operation. Therefore, in the present embodiment, combustion control is performed based on the time change of the thickness of the waste.

Regarding (2) above, the moving speed of the surface of the waste is the speed at which the surface of the waste moves in the transport direction, as shown in FIG. In FIG. 5, a thick line is drawn in a relatively thick portion for easy understanding, and a state in which this portion moves is shown. Since the shape of the surface of the waste is shown in the three-dimensional image at each time, it is possible to obtain how the surface of the waste is moving based on the three-dimensional image. Therefore, the moving speed of the specific part of the waste can be calculated based on the moving distance of the specific part of the surface of the waste and the time taken to move the moving distance. Although it is possible to calculate the moving speed of the waste according to both the transport direction and the furnace width direction (although the treatment may actually be performed), in the present embodiment, only the transport direction is supported. Calculate the moving speed of the waste. If the moving speed of the waste differs in the furnace width direction, the representative value is determined by using the average in the furnace width direction.

As described above, the distribution of the moving speed of the waste in the drying unit 11 can be calculated according to the transport direction. Since the 3D images obtained by the image composition process are sequentially created according to the time, the new movement speed of the waste is calculated using the 3D image at the next time and the past 3D image. Will be done. In this way, the control device 90 calculates the time change of the moving speed of the waste according to the transport direction and stores it in a predetermined storage unit.

The significance of calculating the time change of the moving speed of waste is as follows. That is, the time change of the moving speed of the waste is the actual speed at which the waste accumulated in the drying unit 11 is sent in the transport direction while reducing the volume by the drying operation (feeding operation) of the drying grate 21. It is an indicator of how the waste has been "moved" by the drying operation. Therefore, in the present embodiment, the combustion control is performed based on the time change of the moving speed of the waste.

With respect to the above (3), the drying portion residence time is the time during which the waste accumulated in the drying portion 11 stays in the drying portion 11. In other words, it is the time elapsed from when each waste reaches the drying unit 11 to the present. As described above, the moving speed of the surface of the waste is calculated according to the transport direction and the time. Therefore, it is possible to calculate the residence time of the dry portion of the waste according to the transport direction. Since the three-dimensional images obtained by the image composition process are sequentially created according to the time, the movement speed based on the three-dimensional image at the next time is used to similarly calculate the residence time of the dry portion of the waste ( Will be updated). In this way, the control device 90 calculates the residence time of the dry portion of the waste according to the transport direction and stores it in a predetermined storage unit.

The significance of calculating the residence time of the dry part of waste is as follows. That is, as for the residence time in the drying portion, the waste accumulated in the drying portion 11 is dried by the drying operation (feeding operation) of the drying grate 21, and the moisture contained in the waste is evaporated. This is information on the time taken from the end to the "start of combustion" (actual drying time described later). That is, the residence time according to the transport direction of the drying unit 11 is calculated and updated, and the residence time of the drying unit when the waste reaches the downstream end (or the flame combustion start position) of the drying unit 11 is actually dried. Corresponds to time. In the actual drying time, how easy was the waste accumulated in the drying section 11 to dry (whether the amount of water contained in the waste was small) / whether it was difficult to dry (whether the amount of water contained in the waste was large). ) Is an index. Therefore, in the present embodiment, combustion control is performed based on the residence time of the dry portion.

Next, the control device 90 analyzes the three-dimensional image created by the image processing device 96 to specify the flame combustion start position (S103). The flame combustion start position is a position in the transport direction where flame combustion starts. Since the image acquired by the visible light camera 95 contains flame combustion, the flame is identified based on the color, brightness, etc., and the position of the upstream end of the flame is obtained to start the flame combustion. The position can be specified. In this way, the flame combustion start position can be specified only by the image acquired by the visible light camera 95. However, this makes it impossible to accurately identify the three-dimensional position of the flame contained in the image. Therefore, the control device 90 of the present embodiment specifies the flame combustion start position by using the three-dimensional image. Specifically, the position of the most upstream flame among the flames included in the three-dimensional image (more specifically, the position of the portion of the flame existing on the surface of the waste) is specified. This makes it possible to more accurately identify the flame combustion start position. Although the flame combustion start position is not uniform in the furnace width direction, for example, the flame combustion start position calculated by obtaining the average of the flame combustion start positions in the furnace width direction is stored.

Next, the control device 90 determines whether or not the flame combustion start position has moved to the upstream side based on the time change of the flame combustion start position (S104). For example, when the amount of water contained in the waste supplied to the incinerator 10 is reduced or the combustible waste is supplied, the waste is dried (and thermally decomposed by the drying) in the drying unit 11. The time actually required (actual drying time) is shortened in order to make it (the same applies hereinafter). Therefore, the actual drying time is shorter than the assumed drying time of the waste that is assumed in advance (difference occurs). In this case, as shown in FIG. 6, since the drying is completed in the middle part of the drying part 11, flame combustion occurs in the middle part of the drying part 11 (the flame combustion start position moves to the upstream side). ..

If this state is left unattended, flame combustion will proceed in the drying unit 11, so that the residence time required for flame combustion in the combustion unit 12 will be shortened, and the flame combustion will occur in the middle of the combustion unit 12. Combustion gradually starts after the stage of. As a result, the positions of drying, combustion, and post-combustion on the grate gradually move to the upstream side as a whole, and the burnout point (end position of flame combustion) deviates from the appropriate range. Therefore, stable combustion cannot be maintained.

In order to prevent this, the control device 90 basically determines that the flame combustion start position has moved to the upstream side (Yes in S104), and the waste transfer speed of the dry grate 21 (in the case of Yes). Hereinafter, the transfer speed) is simply increased (S105). As described above, in order to increase the transport speed, the operating speed of the movable grate of the dry grate 21 is increased, or in place of or in addition, the stop time of the movable grate of the dry grate 21 is increased. To shorten. This makes it possible to prevent the combustion position of each part on the grate from moving to the upstream side. Therefore, since the burnout point can be kept within an appropriate range, stable combustion can be maintained. The operating speed or stop time of the movable grate is an example of a control value in controlling the transport speed.

However, based on the fact that the flame combustion start position used for the determination when the transport speed of the drying grate 21 is increased is the information (past information) regarding the waste whose combustion has already been completed, the drying unit 11 is actually used. By correcting the degree of increase in the transport speed based on the above-mentioned correction data which is information on the properties of the waste in the above, more stable combustion can be maintained. In the process of step S105 and other processes, when the correction is performed based on the correction data, the time change of the thickness of the waste, the time change of the moving speed of the surface of the waste, and the residence time of the dried portion of the waste. Make the correction using at least one of.

Specifically, when the decrease in the thickness of waste is accelerating (that is, when the amount of decrease in thickness per unit time (positive) is large), the actual drying time is even shorter than the assumed drying time. Therefore, it may be preferable to further increase the transport speed. Further, since the moving speed of the surface of the waste and the residence time of the drying portion are information on the current transport speed of the waste, it is preferable to change the transport speed of the drying grate 21 in consideration of these values. ..

The drying and combustion generated in the incinerator 10 greatly differ depending on the shape and structure of the incinerator 10 and the waste to be charged. In addition, the target state differs greatly depending on the required processing amount, the durability of the incinerator 10, the laws and regulations regarding exhaust gas, and the like. Therefore, even if the flame combustion start position is moved to the upstream side, it is conceivable that the control for increasing the transport speed is not performed. Similarly, with respect to the correction of the transport speed based on the correction data, there is a possibility that the correction opposite to the above is performed. In addition, the control device 90 not only determines whether or not the flame combustion start position has moved to the upstream side, and further, regarding the necessity and degree of increasing the transport speed of the dry grate 21. It is preferable to determine based on the detection data (for example, the detection data from the gas temperature sensor 91 in the incinerator to the NOx gas concentration sensor 94 and the like).

When the control device 90 determines that the flame combustion start position has not moved to the upstream side (No in S104), the flame combustion start position moves to the downstream side based on the time change of the flame combustion start position. It is determined whether or not it is (S106).

For example, when the amount of water contained in the waste supplied to the incinerator 10 increases or the waste that is hard to burn is supplied, the actual drying time for drying the waste in the drying unit 11 is reached. become longer. Therefore, the actual drying time is longer than the assumed drying time of the waste that is assumed in advance (difference occurs). In this case, as shown in FIG. 7, since the drying is not completed even at the downstream end of the drying unit 11, flame combustion starts in the middle of the combustion unit 12 (the flame combustion start position moves to the downstream side). To do).

If this state is left unattended, the residence time required for flame combustion in the combustion unit 12 cannot be secured, so that the flame combustion that should be completed in the combustion unit 12 shifts to the post-combustion unit 13, and later. Post-combustion will start in the middle of the combustion unit 13. As a result, the positions of drying, combustion, and post-combustion on the grate gradually move to the downstream side as a whole, and the burnout point deviates from the appropriate range, resulting in stable combustion. It becomes unsustainable.

In order to prevent this, the control device 90 basically slows down the transport speed of the dry grate 21 when it is determined that the flame combustion start position has moved to the downstream side (Yes in S106). S107). As described above, in order to reduce the transport speed, the operating speed of the movable grate of the dry grate 21 is reduced, or in place of or in addition, the stop time of the movable grate of the dry grate 21 is lengthened. do. This makes it possible to prevent the combustion position of each part on the grate from moving to the downstream side. Therefore, since the burnout point can be kept within an appropriate range, stable combustion can be maintained.

Further, even when the transport speed is reduced, it is preferable to perform the correction based on the correction data for the same reason as described above. Specifically, when the decrease in the thickness of the waste is accelerating, the actual drying time tends to be shorter than the assumed drying time, so it may be preferable to reduce the degree of deceleration of the transport speed. Further, since the moving speed of the surface of the waste and the residence time of the dry portion are information on the current transport speed of the waste as described above, the transport speed of the dry grate 21 is changed in consideration of these values. It is preferable to do so. For the reason explained in the correction at the time of increasing the transport speed, there is a possibility that the correction of the transport speed based on the correction data is the opposite of the above, depending on the environment and the like. Further, also in the control at the time of deceleration of the transport speed, it is preferable to determine the control value based on still another detection data.

Further, assuming that there is a difference between the actual drying time and the estimated drying time of the waste, changing the transport speed of the drying grate 21 is actually supplied from the drying grate 21 to the combustion grate 22. It means that the properties of the waste that have been made are already different from the conventional assumptions. As a result, if the transport speeds of the combustion grate 22 and the post-combustion grate 23 are the same as those in the conventional state, stable combustion cannot be maintained because the time required for combustion and post-combustion has already changed. ..

In order to prevent this, when the control device 90 changes the transport speed of the dry grate 21 (Yes in S104 or S106), the control device 90 determines the properties of the waste that is the cause of the change in the transport speed of the dry grate 21. The transport speeds of the combustion grate 22 and the post-combustion grate 23 are changed according to the state of change (S108). The control device 90 determines whether or not the transfer speed of the combustion grate 22 and the post-combustion grate 23 needs to be changed and the amount to be changed, in addition to the amount of change in the transfer speed of the dry grate 21. It is preferable to make a decision based on the detection data.

Further, even when the transport speeds of the combustion grate 22 and the post-combustion grate 23 are changed, it is preferable to perform the correction based on the correction data for the same reason as described above. Basically, it is preferable to change the transport speed of the combustion grate 22 and the post-combustion grate 23 as in the dry grate 21, but the waste existing in the dry grate 21 is transferred to the post-combustion grate 23. There is a correlation between the time lag until arrival (in other words, the difference in the properties of waste in each part), the drying time in the drying part 11, the burning time in the burning part 12, and the post-burning time in the post-burning part 13. It may be preferable to perform control different from the above for reasons such as being unable to say.

Next, the control device 90 adjusts at least one of the first damper 81 to the fifth damper 85 according to the state of the change in the properties of the waste that is the cause of the change in the transport speed of the drying grate 21. Then, the supply amounts of the primary combustion gas and the secondary combustion gas are adjusted (S109). That is, the opening degree of the first damper 81 to the fifth damper 85 is an example of the control value. Conventionally, for example, the supply amounts of the primary combustion gas and the secondary combustion gas are adjusted by using the detection data of the NOx gas concentration sensor 94 from the gas temperature sensor 91 in the incinerator.

On the other hand, in the present embodiment, in addition to other detection data, the primary combustion gas and the primary combustion gas are based on the moving direction of the flame combustion start position (whether it is moving to the upstream side or the downstream side). Adjust the supply amount of secondary combustion gas. Here, when the flame combustion start position is moved to the upstream side and the transport speed of each grate is increased, the amount of pyrolysis gas generated is generally large, although it is related to the properties of waste. At the same time, the amount of primary combustion gas (including unburned gas such as CO) generated by the primary combustion is increased. Therefore, it is necessary to increase the supply amount of the primary combustion gas and the secondary combustion gas. On the other hand, when the flame combustion start position is moved to the downstream side and the transport speed of each grate is slowed down, the amount of pyrolysis gas generated is generally small, although it is related to the properties of waste. At the same time, the amount of primary combustion gas generated by the primary combustion is reduced. Therefore, it is necessary to reduce the supply amounts of the primary combustion gas and the secondary combustion gas.

Further, even when the supply amounts of the primary combustion gas and the secondary combustion gas are changed, it is preferable to perform the correction based on the correction data for the same reason as described above. For example, primary air, which is one of the primary combustion gases, is used not only for combustion in the combustion unit 12 but also for drying in the drying unit 11. Therefore, when it is preferable to shorten the actual drying time, the primary air is used. It may be preferable to increase the supply of. However, since the primary air is also used for combustion in the combustion unit 12, such correction may not be performed.

Further, since the properties of the waste may change at all times, the control device 90 performs the processing of step S101 and subsequent steps again after the processing of step S109. As a result, even if the properties of the waste change, it is possible to correct the progress of drying and burning of the waste so that it is stable, so that the flame combustion start position is kept within an appropriate range and stable. Can maintain good combustion.

Next, the second embodiment will be described. In the description of the second embodiment, the description may be omitted for the members and treatments that are the same as or similar to those of the first embodiment.

<S201> Since the process of step S201 is the same as that of step S101 of the first embodiment, the description thereof will be omitted.

<S202> Next, the control device 90 divides the surface of the waste in the three-dimensional image into a plurality of elements (division units), and for each element, (1) the thickness of the waste and (2) the surface movement. The speed is calculated and stored in association with the control value (S202). The mesh division is to divide the waste of the three-dimensional image into a plurality of regions under predetermined conditions. In the present embodiment, as shown in FIG. 10, a plurality of parallel lines in the transport direction and a plurality of parallel lines in the furnace width direction are drawn to divide the waste into a grid pattern. In the present embodiment, the mesh-divided element is a quadrangle, but may have a different shape. The shapes and areas of the plurality of elements may be the same or different. For example, only the part considered to be important may be finely divided into meshes. Further, since the thickness of the waste and the surface moving speed are used to correct the control values of the combustion control as described later, these values are referred to as correction data.

Regarding (1) above, the thickness of the waste is the length along the vertical direction from the grate to the surface of the waste, as shown in FIG. The position of the surface (upper surface) of the grate is stored in advance in the control device 90 or the like. In addition, the position of the surface of the waste can be specified based on the three-dimensional image. Therefore, by comparing these two positions (coordinates), the thickness of the waste can be calculated for each element. As described above, the distribution of the thickness of waste for each element at a certain time can be calculated based on one three-dimensional image. Since the three-dimensional images are sequentially created, the thickness of the waste is calculated in the same manner for the newly created three-dimensional images. In this way, the control device 90 calculates the thickness of the waste for each element and stores it in a predetermined storage unit in chronological order.

The significance of calculating the thickness of waste is as follows. That is, the waste accumulated in the drying portion 11 is dried by evaporating the water contained in the waste along with the drying operation (feeding operation) of the drying grate 21, and the mass is reduced and the volume is also reduced. .. That is, the time change in the thickness of the waste indicates the progress of the drying of the waste, and is a kind of index of the progress of the drying operation.

Regarding (2) above, the surface moving speed of the waste is the speed at which the surface of the waste moves in the transport direction, as shown in FIG. In FIG. 10, a thick line is drawn in a relatively thick portion for easy understanding, and a state in which this portion moves is shown. Since the shape of the surface of the waste is shown in the three-dimensional image, it is possible to obtain how the surface of the waste is moving based on the three-dimensional image created in time series. Therefore, the surface movement speed for each mesh-divided element can be calculated based on the movement distance of a specific portion of the surface of the waste, the time interval at which the three-dimensional image is acquired, and the like. As described above, the distribution of the surface moving speed of waste for each element can be calculated. Since the three-dimensional images are sequentially created, a new surface movement speed of the waste is calculated using the newly created three-dimensional images and the past three-dimensional images thereof. In this way, the control device 90 calculates the surface movement speed of the waste and stores it in a predetermined storage unit in time series.

The significance of calculating the surface moving speed of waste is as follows. That is, the time change of the moving speed of the waste is the actual speed at which the waste accumulated in the drying unit 11 is sent in the transport direction while reducing the volume by the drying operation (feeding operation) of the drying grate 21. It is an indicator of how the waste has been "moved" by the drying operation. Since it is not possible to calculate how the surface other than the surface of the waste moves from the three-dimensional image, it is considered that the "surface moving speed of the waste" indicates the "moving speed of the entire waste" in this embodiment. Then, perform the following calculations.

The control value is a value changed to control the combustion state of the incinerator 10, and is, for example, the transfer speed of each grate, the supply amount of the primary combustion gas, the supply amount of the secondary combustion gas, and the like. It is a value for determining. The thickness of the waste, the surface moving speed, and the volumetric flow rate described later are affected by this control value. Therefore, in order to perform evaluation and control in consideration of the influence of the control value, the control device 90 stores the thickness of the waste and the surface movement speed in association with the control value set in the incinerator 10. Further, when the control value is different depending on the mesh-divided element (for example, the transfer speed of the grate is different between the element on the dry grate 21 and the element on the combustion grate 22), the control device 90 may be used. The thickness and surface movement speed of the waste are stored in association with the control values corresponding to the corresponding elements.

<S203> Next, the control device 90 calculates and stores the thickness progress information for each element based on the thickness of the waste for each element and the surface movement speed in association with the control value (S203). As shown in FIG. 11, the thickness progress information is information showing how the thickness changes in time series until the waste located in the element is located in the element. FIG. 11 schematically shows the thickness progress information of each element in a graph. As shown in this graph, the thickness progress information is information in which "thickness" and "position in the transport direction with the passage of time" are associated with each other. That is, the thickness progress information is information indicating, for example, the thickness of the waste in the element A at the present time when the waste in the element A was present at the upstream position in the past when the element A is focused on. .. The thickness progress information may be information in which the thickness and the time are associated with each other.

The thickness progress information can be calculated as follows, for example. For example, when focusing on a certain element A, the progress of transporting the waste at the position of the element A at the present time (that is, at what time and in which element) is the present and the element on the upstream side of the element A. It can be calculated based on the past surface movement speed. Further, the thickness of the waste for each element and each time is calculated and stored in step S202. Therefore, the thickness progress information can be calculated by associating the time and elements indicated by the progress of transporting the waste with the thickness of the waste. In this way, the control device 90 calculates the thickness progress information based on the thickness of the waste and the surface movement speed. Since the three-dimensional images are sequentially created, new thickness progress information of the waste is calculated by performing the same calculation using the newly created three-dimensional images. The control device 90 stores the calculated thickness progress information in a predetermined storage unit in chronological order. The process and the reason for associating the thickness progress information with the control value are the same as in step S202.

The significance of obtaining thickness progress information is as follows. That is, the thickness progress information is how the volume of the waste accumulated in the drying portion 11 is reduced as it accumulates and passes on the grate by the drying operation (feeding operation) of the drying grate 21. However, it shows the process of being sent in the feeding direction, and is an index of how the volume of waste has been reduced by the drying operation.

<S204> Next, the control device 90 calculates the volume flow rate progress information for each element based on the surface movement speed of the waste for each element and the thickness progress information, and stores it in association with the control value (S204). As shown in FIG. 12, the volume flow rate progress information is information showing how the volume flow rate changes in time series until the waste located in the element is located in the element. In FIG. 12, the volumetric flow rate progress information of each element is schematically shown graphically. As shown in this graph, the volume flow rate progress information is information in which the "volume flow rate" and the "transportation direction position with the passage of time" are associated with each other. That is, the volume flow rate progress information is information indicating, for example, what kind of volume flow rate the waste in the element A at the present time had when it was present at the upstream position in the past when focusing on the element A. Is. The volume flow rate progress information may be information indicating the correspondence between the volume flow rate and the time.

Volumetric flow rate is the volume of waste that moves per unit time. Therefore, the volumetric flow rate can be calculated by multiplying the "waste thickness", "waste surface moving speed", and "furnace width length", respectively. Further, the furnace width length when calculating the volume flow rate for each element is the furnace width length of each element. Therefore, the volume flow rate progress information is the value obtained by multiplying the "thickness of waste indicated by the thickness progress information" and the "surface movement speed of waste" by combining the elements (positions) and the time, and "the furnace width of each element". It can be calculated by multiplying by "length". In this way, the control device 90 calculates the volume flow rate progress information for each element and stores it in a predetermined storage unit. Since the three-dimensional images are sequentially created, new volume flow rate progress information of the waste is calculated by performing the same calculation using the newly created three-dimensional images. The control device 90 stores the calculated volume flow rate progress information in a predetermined storage unit in time series in association with the control value. The process and the reason for associating the volume flow rate progress information with the control value are the same as in step S202. Further, since the furnace width length is a constant, the volume flow rate progress information is a function of only the waste thickness and the surface moving speed. In other words, the volumetric flow rate progress information is conceptual information including not only the thickness of waste but also the moving speed.

If the furnace width length of each grate is constant and the furnace width length of each element is constant, the process of multiplying the furnace width length may be omitted. This is because what is required for combustion control is not a specific value of the volumetric flow rate, but a variation mode thereof. In other words, the vertical axis of the graph in the upper figure of FIG. 12 is not limited to a specific volume flow rate, and may be a value proportional (correlated) to the volume flow rate.

The significance of acquiring volume flow rate progress information is as follows. That is, the waste accumulated in the drying portion 11 is compressed by the evaporation of water with the drying operation (feeding operation) of the drying grate 21, and the mass and volume are reduced. That is, the volumetric flow rate progress information indicates the progress of the waste drying, and is a direct index of the degree of progress of the drying operation. Here, from the state where the drying of the waste progresses and the water from the waste evaporates (dry state), the amount of evaporation of water decreases and the internal temperature of the waste layer rises, so that heat from the waste is generated. It shifts to the state where decomposition gas is generated (thermal decomposition state). Further, since combustion can be started when the pyrolysis state is reached, the state after the transition to the pyrolysis state is referred to as a "combustion startable state". In addition, the degree of change in the volume of waste becomes smaller by shifting to the state where combustion can be started. Therefore, the volume flow rate progress information is the most suitable index for evaluating the degree of the state in which combustion can be started.

<S205> Next, the control device 90 determines whether or not the current state is capable of starting combustion for each element based on the volume flow rate progress information for each element, and stores the determination result (S205). As described above, the volumetric flow rate of the waste is greatly reduced at the timing of shifting to the state where combustion can be started. Therefore, it is possible to determine whether or not the element is in the combustion start state based on the volume flow rate progress information for each element. However, since the degree of change in the volume flow rate differs depending on the control value of the incinerator 10, it is preferable to make a determination using a condition (for example, a threshold value) according to the control value. Even if the waste is ready for combustion, it does not necessarily mean that combustion has actually started. This is because even if the waste is ready for combustion, combustion does not occur depending on the amount of oxygen around the waste and the temperature conditions.

Here, as described above, the visible image acquired by the visible light camera 95 does not include waste located at the root of the flame. Therefore, it is not possible to calculate the volumetric flow rate progress information for the waste at the position where the flame is generated and in the vicinity thereof. Here, when the time from when the waste is in the combustible startable state to when the flame is generated is relatively long, the element in which the combustion can be started can be specified based on the volume flow rate progress information. However, if a flame is generated at the same time as the waste becomes ready for combustion, the fact that the volumetric flow rate has changed significantly cannot be detected. It's difficult to do.

<S206> Therefore, in order to compensate for the omission of the volume flow rate progress information, the control device 90 determines and stores for each element whether or not a flame is generated based on the three-dimensional image (S206). The control device 90 identifies the position of the flame, for example, based on the difference in color and brightness between the flame and the waste. Then, for each element of the waste, it is determined whether or not a flame is generated from the waste, and the determination result is stored. It is also possible to detect the presence or absence of a flame by using the visible image acquired by the visible light camera 95. However, since it is not possible to accurately determine the position where the flame is generated, it is not possible to determine whether or not the flame is generated for each element. Therefore, it is necessary to make a determination based on a three-dimensional image as in the present embodiment.

<S207> Next, the control device 90 identifies and stores the position (flame generation start position) and time at which the flame generation starts based on the determination result for each element of whether or not the flame is generated. (S207). The position where the flame starts to be generated is the position of the flame on the most upstream side in the transport direction among the flames included in the three-dimensional image (more specifically, the part of the flame existing on the surface of the waste). Position). In other words, among the elements determined to generate the flame in step S206, the element on the most upstream side in the transport direction is specified. As a result, the flame generation start position at a certain time is specified. By performing this process using a three-dimensional image created in chronological order, it is possible to specify the position and time when the flame starts to occur.

<S208> Next, the control device 90 specifies the combustion start evaluation position based on the determination result for each element of whether or not the combustion start is possible state and the determination result of the flame generation start position (S208). .. The combustion start evaluation position is an index of the position where combustion has started in the incinerator 10 as a whole, and is a position for evaluating combustion. In other words, the combustion start evaluation position is a position that represents "where the combustion started" in the incinerator 10 as a whole in the waste incineration process. When incinerating waste, which is a mixture of substances with various properties, the time required for each substance to reach the "combustion startable state" varies, so the "combustion startable state" and "flame" The "position where the generation starts" also varies, and the positions in the transport direction do not always match. For example, the distribution shown in FIG. 13 may occur. Note that FIG. 13 is a schematic view of the transport unit 20 as viewed in the vertical direction, and each of the squares shown in FIG. 13 is a mesh-divided element. As described above, there are some elements in which the flame is not generated (combustion has not started) even though the combustion can be started. As shown in FIG. 13, since the position where the combustion can be started and the combustion start position based on the presence or absence of the flame vary, the judgment result for each element is comprehensively evaluated, and the combustion start evaluation of the incinerator 10 as a whole is evaluated. Identify the location. In particular, for elements for which the volume flow rate progress information of the waste product is not sufficiently obtained due to the flame being an obstacle, the combustion start evaluation position of the incinerator 10 as a whole is specified by referring to the combustion start position based on the presence or absence of the flame. ..

In addition, this method uses "volume flow rate progress information" that shows the same behavior even when the properties and mixing ratio of substances with various properties contained in each "lump" of waste change. Since the combustion startable state is determined, the combustion startable state can be determined with high reliability. The combustion start evaluation position indicates a position in the transport direction, but can also be treated as, for example, a straight line or a curve extending in the furnace width direction.

The combustion start evaluation position may exist in the combustion unit 12 instead of the drying unit 11. Even in that case, in order to specify the combustion start evaluation position, it is preferable that the above-mentioned treatments of steps S201 to S208 are performed not only on the drying unit 11 but also on the waste of the combustion unit 12.

<S209> Next, the control device 90 determines whether or not the combustion start evaluation position has moved to the upstream side based on the time change of the combustion start evaluation position (S209). This determination is made by comparing the combustion start evaluation position calculated in the past with the current combustion start evaluation position. For example, when the amount of water contained in the waste supplied to the incinerator 10 is reduced or the combustible waste is supplied, the waste is dried (and thermally decomposed by the drying) in the drying unit 11. The time actually required (actual drying time) is shortened in order to make it (the same applies hereinafter). Therefore, the actual drying time is shorter than the assumed drying time of the waste that is assumed in advance (difference occurs). In this case, as shown in FIG. 6, since the drying is completed in the middle part of the drying part 11, flame combustion occurs in the middle part of the drying part 11 (the combustion start position moves to the upstream side).

If this state is left unattended, flame combustion will proceed in the drying unit 11, so that the residence time required for flame combustion in the combustion unit 12 will be shortened, and the flame combustion will occur in the middle of the combustion unit 12. Combustion gradually starts after the stage of. As a result, the positions of drying, combustion, and post-combustion on the grate gradually move to the upstream side as a whole, and the burnout position (end position of flame combustion) deviates from the appropriate range. Therefore, stable combustion cannot be maintained.

<S210> In order to prevent this, the control device 90 basically determines that the combustion start evaluation position has moved to the upstream side (in the case of Yes in S209), the waste of the dry grate 21. The transport speed (hereinafter, simply the transport speed) is increased (S210). As described above, in order to increase the transport speed, the operating speed of the movable grate of the dry grate 21 is increased, or in place of or in addition, the stop time of the movable grate of the dry grate 21 is increased. To shorten. This makes it possible to prevent the positions of drying, burning, and post-combustion on the grate from moving to the upstream side. Therefore, since the burnout position can be kept within an appropriate range, stable combustion can be maintained. The operating speed or stop time of the movable grate is an example of a control value in controlling the transport speed.

However, based on the fact that the information on the combustion start evaluation position used for the determination when the transport speed of the drying grate 21 is increased is the information on the waste that has already been dried (past information), it is actually dried. Further stable combustion can be maintained by correcting the degree of increase in the transport speed based on the above-mentioned correction data which is information on the properties of the waste in the part 11. In the process of step S210 and other processes, when making a correction based on the correction data, at least one of the time change of the thickness of the waste and the time change of the moving speed of the surface of the waste is used. Make corrections.

Specifically, when the decrease in the thickness of waste is accelerating (that is, when the amount of decrease in thickness per unit time (positive) is large), the actual drying time is even shorter than the assumed drying time. Therefore, it may be preferable to further increase the transport speed. Further, since the moving speed of the surface of the waste is information on the current transport speed of the waste, it is preferable to change the transport speed of the drying grate 21 in consideration of these values.

The drying and combustion generated in the incinerator 10 greatly differ depending on the shape and structure of the incinerator 10 and the waste to be charged. In addition, the target state differs greatly depending on the required processing amount, the durability of the incinerator 10, the laws and regulations regarding exhaust gas, and the like. Therefore, even if the combustion start evaluation position is moved to the upstream side, it is conceivable that the control for increasing the transport speed is not performed. Similarly, with respect to the correction of the transport speed based on the correction data, there is a possibility that the correction opposite to the above is performed. The control device 90 not only determines whether or not the combustion start evaluation position has moved to the upstream side and correction data regarding the necessity and degree of increase in the transport speed of the dry grate 21. It is preferable to determine based on the detection data (for example, the detection data from the gas temperature sensor 91 in the incinerator to the NOx gas concentration sensor 94 and the like).

<S211> When the control device 90 determines that the combustion start evaluation position has not moved to the upstream side (No in S209), the combustion start evaluation position is on the downstream side based on the time change of the combustion start evaluation position. It is determined whether or not the vehicle has moved to (S211). This determination is made by comparing the combustion start evaluation position calculated in the past with the current combustion start evaluation position in the same manner as described above.

For example, when the amount of water contained in the waste supplied to the incinerator 10 increases or the waste that is hard to burn is supplied, the actual drying time for drying the waste in the drying unit 11 is reached. become longer. Therefore, the actual drying time is longer than the assumed drying time of the waste that is assumed in advance (difference occurs). In this case, as shown in FIG. 7, since the drying is not completed even at the downstream end of the drying unit 11, flame combustion starts in the middle of the combustion unit 12 (the combustion start position moves to the downstream side). ) Will be.

If this state is left unattended, the residence time required for flame combustion in the combustion unit 12 cannot be secured, so that the flame combustion that should be completed in the combustion unit 12 shifts to the post-combustion unit 13, and later. Post-combustion will start in the middle of the combustion unit 13. As a result, the respective positions of drying, combustion, and post-combustion on the grate gradually move to the downstream side as a whole, and the combustion start position and the burnout position deviate from the appropriate range. It becomes impossible to maintain stable combustion.

<S212> In order to prevent this, the control device 90 basically determines the transport speed of the dry grate 21 when it is determined that the combustion start evaluation position has moved to the downstream side (Yes in S211). Decelerate (S212). As described above, in order to reduce the transport speed, the operating speed of the movable grate of the dry grate 21 is reduced, or in place of or in addition, the stop time of the movable grate of the dry grate 21 is lengthened. do. This makes it possible to prevent the positions of drying, burning, and post-combustion on the grate from moving to the downstream side. Therefore, since the combustion start position and the burnout position can be kept in an appropriate range, stable combustion can be maintained.

Further, even when the transport speed is reduced, it is preferable to perform the correction based on the correction data for the same reason as described above. Specifically, when the decrease in the thickness of the waste is accelerating, the actual drying time tends to be shorter than the assumed drying time, so it may be preferable to reduce the degree of deceleration of the transport speed. Similarly, when the moving speed of the surface of the waste is accelerating, the actual drying time tends to be shorter than the assumed drying time, so it may be preferable to reduce the degree of deceleration of the transport speed. .. For the reason explained in the correction at the time of increasing the transport speed, there is a possibility that the correction of the transport speed based on the correction data is the opposite of the above, depending on the environment and the like. Further, also in the control at the time of deceleration of the transport speed, it is preferable to determine the control value based on still another detection data.

Further, assuming that there is a difference between the actual drying time and the estimated drying time of the waste, changing the transport speed of the drying grate 21 is actually supplied from the drying grate 21 to the combustion grate 22. It means that the properties of the waste that have been made are already different from the conventional assumptions. As a result, if the transport speeds of the combustion grate 22 and the post-combustion grate 23 are the same as those in the conventional state, stable combustion cannot be maintained because the time required for combustion and post-combustion has already changed. ..

<S213> In order to prevent this, when the transfer speed of the dry grate 21 is changed (Yes in S209 or S211), the control device 90 causes the change in the transfer speed of the dry grate 21. The transport speeds of the combustion grate 22 and the post-combustion grate 23 are changed according to the state of change in the properties of the above (S213). The control device 90 determines whether or not the transfer speed of the combustion grate 22 and the post-combustion grate 23 needs to be changed and the amount to be changed, in addition to the amount of change in the transfer speed of the dry grate 21. It is preferable to make a decision based on the detection data.

Further, even when the transport speeds of the combustion grate 22 and the post-combustion grate 23 are changed, it is preferable to perform the correction based on the correction data for the same reason as described above. Basically, it is preferable to change the transport speed of the combustion grate 22 and the post-combustion grate 23 as in the dry grate 21, but the waste existing in the dry grate 21 is transferred to the post-combustion grate 23. There is a correlation between the time lag until arrival (in other words, the difference in the properties of waste in each part), the drying time in the drying part 11, the burning time in the burning part 12, and the post-burning time in the post-burning part 13. It may be preferable to perform control different from the above for reasons such as being unable to say.

<S214> Next, the control device 90 uses at least one of the first damper 81 to the fifth damper 85 according to the state of the change in the properties of the waste that is the cause of the change in the transport speed of the drying grate 21. By adjusting, the supply amounts of the primary combustion gas and the secondary combustion gas are adjusted (S214). That is, the opening degree of the first damper 81 to the fifth damper 85 is an example of the control value. Conventionally, for example, the supply amounts of the primary combustion gas and the secondary combustion gas are adjusted by using the detection data of the NOx gas concentration sensor 94 from the gas temperature sensor 91 in the incinerator.

On the other hand, in the present embodiment, in addition to other detection data, the primary combustion gas and the primary combustion gas are based on the moving direction of the combustion start evaluation position (whether it is moving to the upstream side or the downstream side). Adjust the supply amount of secondary combustion gas. Here, when the combustion start evaluation position is moved to the upstream side and the transport speed of each grate is increased, it is generally generated per hour of pyrolysis gas, although it is related to the properties of waste. As the amount increases, the amount of primary combustion gas (including unburned gas such as CO) generated by the primary combustion increases per hour. Therefore, it is necessary to increase the supply amount of the primary combustion gas and the secondary combustion gas. On the other hand, when the combustion start evaluation position is moved to the downstream side and the transport speed of each grate is slowed down, the amount of pyrolysis gas generated per hour is generally related to the properties of waste. As the amount of primary combustion gas is reduced, the amount of primary combustion gas generated per hour due to the primary combustion is reduced. Therefore, it is necessary to reduce the supply amounts of the primary combustion gas and the secondary combustion gas.

Further, even when the supply amounts of the primary combustion gas and the secondary combustion gas are changed, it is preferable to perform the correction based on the correction data for the same reason as described above. For example, primary air, which is one of the primary combustion gases, is used not only for drying in the drying unit 11 but also for combustion in the combustion unit 12, so if it is preferable to shorten the actual drying time, the primary air It may be preferable to increase the supply of. However, since the primary air is also used for combustion in the combustion unit 12, such correction may not be performed.

Further, since the properties of the waste may change at all times, the control device 90 performs the processing of step S201 and subsequent steps again after the case of No in step S212 and the processing of step S214. As a result, even if the properties of the waste change, it is possible to correct the progress of drying and burning of the waste so that it is appropriate, so that the combustion start position and the burnout position are within an appropriate range. It can be stored and stable combustion can be maintained.

As described above, in the first and second embodiments, the following in-core image creation method is performed. That is, the incinerator 10 to be subjected to this method is divided into a drying unit 11, a combustion unit 12, and a post-combustion unit 13, and the waste is generated by intermittently operating in a state where the waste is accumulated. Equipped with a grate to carry. The method for creating an image in a furnace includes a step of acquiring a visible image and a step of creating a three-dimensional image. In the visible image acquisition step, one visible light camera 95 is used to observe the flame and at least the waste deposited on the dry portion 11 to acquire a visible image. In the three-dimensional image creation step, distance measurement using lens aberration is performed on the visible image acquired in the visible image acquisition step to construct distance information indicating the distance to the object included in the visible image, and the distance is concerned. Three-dimensional images are continuously created based on the information.

Thereby, by utilizing the lens aberration, the distance to the object can be specified by using the image taken by one visible light camera 95. Therefore, a three-dimensional image can be created from an image taken by one visible light camera 95. As described above, the position of the object in the furnace can be accurately grasped without arranging a plurality of visible light cameras 95.

In the first embodiment, the method for determining the state inside the furnace is performed using the three-dimensional image created by the method for creating the image inside the furnace. In the furnace condition determination method, the flame combustion start position is specified based on the flame included in the three-dimensional image, and whether the flame combustion start position is moved to the upstream side in the transport direction or the downstream side in the transport direction. Perform a calculation process to calculate.

Thereby, the moving direction of the combustion start position can be accurately calculated by using the three-dimensional image, and the shape of the waste of the drying portion 11 and its movement can be sufficiently detected.

In the method for determining the state of the inside of the furnace of the first embodiment, the time change of the thickness of the waste on the drying grate 21 is calculated for the waste of the drying unit 11 based on the three-dimensional image.

In the method for determining the in-furnace condition of the first embodiment, the time change of the moving speed of the surface of the waste of the drying unit 11 is calculated based on the three-dimensional image.

In the method for determining the in-furnace condition of the first embodiment, the time during which the waste in the drying unit 11 stays in the drying unit 11 based on the time change of the moving speed of the surface of the waste in the drying unit 11 is dried. Calculate the unit residence time.

From the above, in the drying unit 11, it is possible to grasp the situation regarding how much the drying of the waste is progressing due to the change in the properties of the waste and the like.

In the combustion control method of the first embodiment, when it is specified that the flame combustion start position is moved to the upstream side in the transport direction, the speed of transporting waste by the drying grate 21 of the drying section 11 is increased. Control to make it. When it is specified that the flame combustion start position is moved to the downstream side in the transport direction, the dry grate 21 of the drying section 11 controls to slow down the transport speed of the waste.

As a result, the difference between the assumed drying time and the actual drying time can be reduced, so that the progress of drying and burning of the waste can be made more appropriate. As a result, it is possible to keep the burnout point within an appropriate range and maintain stable combustion.

In the combustion control method of the first embodiment, a process of calculating the time change of the thickness of the waste on the drying grate 21, a process of calculating the time change of the moving speed of the surface of the waste of the drying unit 11, and the drying unit. Perform at least one of the processes for calculating the residence time. The transport speed of the drying grate 21 of the drying unit 11 is changed, and the combustion grate 22 and the post-combustion grate 23 are changed according to the state of change in the properties of the waste obtained by at least one of the above treatments. Change the transport speed.

Thereby, by changing not only the transport speed of the dry grate 21, but also the transport speed of the combustion grate 22 and the post-combustion grate 23, it is possible to correct the overall fluctuation of the combustion state.

In the combustion control method of the first embodiment, the drying unit 11, the combustion unit 12, and the post-combustion unit are based on whether the flame combustion start position is moved to the upstream side in the transport direction or the downstream side in the transport direction. The amount of primary combustion gas supplied to at least one of 13 is adjusted.

As a result, it is possible to correct the excess or deficiency of the primary combustion gas caused by changing the transport speed of the waste, so that drying, combustion, and post-combustion can be performed more appropriately.

In the combustion control method of the present embodiment, in the incinerator 10, the primary combustion performed in the drying unit 11, the combustion unit 12, and the post-combustion unit 13 and the primary combustion gas including the unburned gas generated in the primary combustion are burned. The secondary combustion that causes is performed. The supply amount of the secondary combustion gas is adjusted based on whether the flame combustion start position is moved to the upstream side in the transport direction or the downstream side in the transport direction.

As a result, the progress of the primary combustion (that is, the amount of the primary combustion gas generated, etc.) can be estimated based on the moving direction of the flame combustion start position, and the supply amount of the secondary combustion gas is adjusted accordingly. This makes it possible to sufficiently burn the unburned gas contained in the primary combustion gas in the secondary combustion.

In the combustion control method of the first embodiment, of the time change of the thickness of the waste on the dry grate 21, the time change of the moving speed of the surface of the waste of the dry part 11, and the residence time of the dry part. A control value for controlling the combustion state is determined based on at least one of them.

As a result, the control value can be corrected by using the information on the properties of the waste actually in the drying unit 11 in addition to the flame combustion start position. Therefore, the waste actually in the drying unit 11 can be used as compared with the case where the correction is not performed. A consistent and stable combustion can be maintained.

In the second embodiment, the combustion state evaluation method is performed using the three-dimensional image created by the in-core image creation method. The combustion state evaluation method includes a division step, a flame determination step, a first calculation step, a second calculation step, a third calculation step, a state determination step, and an evaluation step. In the division step, the waste of the three-dimensional image is mesh-divided into a plurality of elements. In the flame determination step, it is determined for each element whether or not a flame is generated from the waste based on the three-dimensional image. In the first calculation step, the thickness of the waste and the surface movement speed of the waste are calculated for each element based on the three-dimensional image. In the second calculation step, based on the calculation result of the first calculation step, the element shows the thickness progress information showing how the thickness of the waste located in the element changes in time series until it is located in the element. Calculated for each. In the third calculation step, based on the calculation results of the first calculation step and the second calculation step, it is shown how the volumetric flow rate changes in time series until the waste located in the element is located in the element. Volume flow rate progress information is calculated for each element. In the state determination step, the volume flow rate progress information is analyzed, and it is determined for each element whether or not the waste is in a state in which combustion can be started, which indicates a state in which the waste has transitioned from a dry state to a thermal decomposition state. In the evaluation step, based on the determination results of the flame determination step and the state determination step, the combustion start evaluation position, which is an index of the position where combustion has started in the incinerator 10 as a whole and is a position for evaluating combustion, is specified.

As a result, the combustion start position is evaluated based on both the position where combustion can be started and the position where it is determined that combustion has started based on the flame, so that the state of waste and combustion can be more accurately determined. Can be evaluated. In particular, since the combustion start evaluation position is specified based on how the volumetric flow rate of the waste has changed over time, the combustion start evaluation position can be specified with high reliability.

In the combustion condition evaluation method of the second embodiment, in the flame determination step, among the elements in which the flame is generated from the waste, the position of the element located on the most upstream side in the waste transport direction is set as the flame generation start position. Identify. In the evaluation step, the combustion start evaluation position is specified based on the judgment result of the flame generation start position and the state determination step.

As a result, the combustion start evaluation position can be specified by effectively utilizing the determination result of whether or not a flame has occurred.

In the combustion control method of the second embodiment, when it is specified that the combustion start evaluation position is moved to the upstream side in the transport direction, the dry grate 21 controls to increase the transport speed of the waste. When it is specified that the combustion start evaluation position is moved to the downstream side in the transport direction, the dry grate 21 controls to slow down the transport speed of the waste.

As a result, the difference between the assumed drying time and the actual drying time can be reduced, so that the progress of drying and burning of the waste can be made more appropriate. As a result, it is possible to keep the burnout position within an appropriate range and maintain stable combustion.

In the combustion control method of the second embodiment, the transport speed of the waste by the dry grate 21 is determined based on at least one of the thickness of the waste and the surface movement speed of the waste calculated in the first calculation step. Correct the control value for shifting.

As a result, the control value can be corrected by using the information on the properties of the waste actually in the drying unit 11 in addition to the combustion start evaluation position, so that the waste actually in the drying unit 11 can be used as compared with the case where the correction is not performed. A consistent and stable combustion can be maintained.

In the combustion control method of the second embodiment, the transport speed of the dry grate 21 is changed, and the combustion grate is changed according to the state of the change in the properties of the waste that is the cause of the change in the transport speed of the dry grate 21. The transport speed of the grate of 22 and the post-combustion grate 23 is changed.

Thereby, by changing not only the transport speed of the dry grate 21, but also the transport speed of the combustion grate 22 and the post-combustion grate 23, it is possible to correct the overall fluctuation of the combustion state.

In the combustion control method of the second embodiment, the drying unit 11, the combustion unit 12, and the post-combustion unit 13 are based on whether the combustion start evaluation position is moved to the upstream side in the transport direction or the downstream side in the transport direction. The amount of primary combustion gas supplied to at least one of the above is adjusted.

As a result, it is possible to correct the excess or deficiency of the primary combustion gas caused by changing the transport speed of the waste, so that drying, combustion, and post-combustion can be performed more appropriately.

In the combustion control method of the second embodiment, in the incinerator 10, the primary combustion performed in the drying unit 11, the combustion unit 12, and the post-combustion unit 13 and the primary combustion gas including the unburned gas generated in the primary combustion are produced. Secondary combustion to burn is performed. The supply amount of the secondary combustion gas is adjusted based on whether the combustion start evaluation position is moved to the upstream side in the transport direction or the downstream side in the transport direction.

As a result, the progress of the primary combustion (that is, the amount of the primary combustion gas generated, etc.) can be estimated based on the moving direction of the combustion start evaluation position, and the supply amount of the secondary combustion gas is adjusted accordingly. This makes it possible to sufficiently burn the unburned gas contained in the primary combustion gas in the secondary combustion.

Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example.

In the first and second embodiments, the process of creating a three-dimensional image of the entire drying section 11 in the transport direction (from the upstream end to the downstream end) has been described. Instead, the control device 90 creates a three-dimensional image of a part of the drying unit 11 in the transport direction (for example, a portion excluding the upstream end and its vicinity, or a portion downstream from the center of the transport direction). It may be configured to be used.

In the first and second embodiments, the transport speed from the dry grate 21 to the post-combustion grate 23 (particularly the dry grate 21), the primary combustion gas, and the secondary combustion are based on the moving direction of the flame combustion start position. Although the process of changing the supply amount of the gas is performed, the process of changing these values may be performed by using the moving speed in addition to the moving direction of the flame combustion start position.

In the first and second embodiments, the correction is performed based on the correction data, but the correction based on the correction data may be omitted for at least one of these processes. Further, in step S108 or step S211, correction may be performed based on the correction data not only for both the combustion grate 22 and the post-combustion grate 23 but for only one of them.

In the first and second embodiments, the detection data used in the combustion control includes the detection data of the incinerator gas temperature sensor 91, the incinerator outlet gas temperature sensor 92, the CO gas concentration sensor 93, and the NOx gas concentration sensor 94. As described above, the combustion control may be performed by omitting at least one detection data, or the combustion control may be performed by adding detection data different from the above. As another detection data, for example, the amount of boiler evaporation accompanying the recovery of the amount of heat from the exhaust gas, or the amount of water for cooling by spraying water when cooling by water spraying can be used.

10 Incinerator 11 Drying part 12 Combustion part 13 Post-combustion part 21 Dry grate 22 Combustion grate 23 Post-combustion grate 90 Control device 95 Visible light camera 96 Image processing device

<S205> Next, the control device 90 determines whether or not the current state is capable of starting combustion for each element based on the volume flow rate progress information for each element, and stores the determination result (S205). As described above, the degree of change in the volumetric flow rate of waste is greatly reduced at the timing of transition to the combustible startable state. Therefore, it is possible to determine whether or not the element is in the combustion start state based on the volume flow rate progress information for each element. However, since the degree of change in the volume flow rate differs depending on the control value of the incinerator 10, it is preferable to make a determination using a condition (for example, a threshold value) according to the control value. Even if the waste is ready for combustion, it does not necessarily mean that combustion has actually started. This is because even if the waste is ready for combustion, combustion does not occur depending on the amount of oxygen around the waste and the temperature conditions.

Here, as described above, the visible image acquired by the visible light camera 95 does not include waste located at the root of the flame. Therefore, it is not possible to calculate the volumetric flow rate progress information for the waste at the position where the flame is generated and in the vicinity thereof. Here, when the time from when the waste is in the combustible startable state to when the flame is generated is relatively long, the element in which the combustion can be started can be specified based on the volume flow rate progress information. However, if a flame is generated at the same time as the waste is in a state where combustion can be started, the fact that the degree of change in the volumetric flow rate has changed significantly cannot be detected, so the combustion can be started based only on the volume flow rate progress information. It is difficult to identify the elements.

Claims (3)

For an incinerator equipped with a grate that is divided into a drying part, a combustion part, and a post-combustion part, and operates intermittently in a state where the waste is accumulated, the waste is transported.
A visible image acquisition step of observing a flame and at least the waste deposited on the dry portion using one visible light camera to acquire a visible image.
By performing distance measurement using lens aberration on the visible image acquired in the visible image acquisition step, distance information indicating the distance to the object included in the visible image is constructed, and 3 based on the distance information. A 3D image creation process that continuously creates 3D images,
A method for creating an image in a furnace, which comprises performing a process including. A method for determining an in-core condition using the in-core image creating method according to claim 1.
The flame combustion start position is specified based on the flame included in the 3D image created in the 3D image creation step, and the flame combustion start position is moved to the upstream side in the transport direction or to the downstream side in the transport direction. A method for determining the condition inside a furnace, which comprises performing a calculation process for calculating whether or not the combustion is performed. A combustion condition evaluation method using the in-furnace image creation method according to claim 1.
A division step of dividing the waste of the three-dimensional image into a plurality of elements in a mesh, and
Based on the three-dimensional image, a flame determination step of determining whether or not a flame is generated from the waste for each element, and a flame determination step.
Based on the three-dimensional image, the first calculation step of calculating the thickness of the waste and the surface movement speed of the waste for each element, and
Based on the calculation result of the first calculation step, thickness progress information indicating how the thickness of the waste located in the element changes in time series until the waste is located in the element is provided for each element. The second calculation process to calculate and
Based on the calculation results of the first calculation step and the second calculation step, the volume flow rate showing how the volume flow rate changed in time series until the waste located in the element was located in the element. The third calculation step of calculating the progress information for each of the above elements, and
A state determination step of analyzing the volumetric flow rate progress information and determining for each element whether or not the waste is in a combustion startable state indicating a state in which the waste has transitioned from a dry state to a thermal decomposition state.
Based on the determination results of the flame determination step and the state determination step, an evaluation step of specifying a combustion start evaluation position, which is an index of a position where combustion has started in the incinerator as a whole and is a position for evaluating combustion, and an evaluation step.
A combustion condition evaluation method characterized by performing.

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