JP2023040645A - Device for controlling incinerator facility - Google Patents

Abstract

To provide a control device that stabilizes combustion of an incinerator facility.SOLUTION: A device for controlling an incinerator facility includes: a furnace body for transporting an object to be burned while burning the object to be burned; a burning air supply part for supplying burning air to the furnace; and a burning air control unit for controlling the burning air on the basis of a supply amount of an object to be burnt and supplied to the furnace or heat generation amount, before the object to be burnt is loaded into the furnace.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a controller for an incinerator installation.

Generally, garbage incineration equipment is provided with a hopper, and garbage thrown into the hopper by a crane is sequentially supplied to the incinerator by a dust feeder arranged below the hopper. In Patent Document 1, the specific gravity of the garbage is calculated from the volume and weight of the garbage put into the hopper of the garbage incineration equipment, and the specific gravity of the garbage is multiplied by the supply volume of the garbage to determine the garbage supplied into the incinerator. , and further calculates the amount of heat input from the weight of the supplied refuse, and controls the supply of refuse into the incinerator so that the amount of heat input per unit time is constant. there is

Japanese Patent No. 6779779

In Patent Document 1, a range of time (for example, 1 to 2 hours) required from being thrown into the hopper to being supplied to the incinerator is set, and the weight of garbage to be supplied into the incinerator is set from that point. It is calculated by multiplying the average value of the specific gravity of the garbage that has been put into the hopper in the past within the specified time range by the supply volume of the garbage. In order to stabilize the combustion state in the furnace, it is preferable to more accurately estimate the amount of waste to be supplied and the control amount to replace it, and to execute control according to the estimated amount of supply and the like in advance.

The present disclosure provides a control device for incinerator equipment that can solve the above problems.

A control device of the present disclosure is a control device for an incinerator facility having a furnace for burning and conveying incinerators and a combustion air supply unit for supplying combustion air to the furnace, wherein a combustion air control unit for controlling the combustion air before the incineration material is put into the furnace based on the supply amount or calorific value of the incineration material.

According to the control device for the incinerator facility described above, the combustion state in the furnace of the refuse incineration facility can be stabilized.

It is a figure which shows an example of the refuse incineration equipment which concerns on each embodiment. It is a flow chart which shows an example of operation of a control device concerning a first embodiment. It is a flow chart which shows an example of operation of a control device concerning a second embodiment. It is a flow chart which shows an example of operation of a control device concerning a third embodiment. It is the 1st figure explaining estimation processings, such as the calorific value of dust concerning a fourth embodiment. FIG. 12 is a second diagram illustrating estimation processing of the amount of heat generated by dust and the like according to the fourth embodiment; FIG. 14 is a third diagram for explaining estimation processing of the calorific value of dust and the like according to the fourth embodiment; It is a figure which shows an example of the hardware constitutions of the control apparatus which concerns on each embodiment.

Hereinafter, the garbage incineration equipment of the embodiment will be described with reference to the drawings. In the following description, the same reference numerals are given to components having the same or similar functions. Duplicate descriptions of these configurations may be omitted. "XX or YY" is not limited to either one of XX and YY, but may include both XX and YY. This is also the case when there are three or more selective elements. "XX" and "YY" are arbitrary elements (eg, arbitrary information).

(System configuration)
Drawing 1 is a figure showing an example of the garbage incineration equipment concerning each embodiment.
Garbage incineration equipment 100 includes a hopper 1 into which garbage is thrown, a chute 2 that guides the garbage thrown into the hopper 1 downward, a feeder 10 that feeds the garbage supplied through the chute 2 into a combustion chamber 6, and a feeder. A fire grate 3 for drying and burning while transporting the refuse supplied by 10, a combustion chamber 6 for burning the refuse, an ash outlet 7 for discharging ash, and a blower 4 for supplying air. , a plurality of wind boxes 5A to 5E that guide the air supplied by the blower 4 to each part of the grate 3, and a pipe that directly supplies the air supplied by the blower 4 to the combustion chamber 6 (secondary combustion chamber 6B) A road 14, a boiler 9, a crane 17 for conveying garbage, a sensor 15 for detecting the surface of the garbage from above the hopper 1, and an image sensor 16 for photographing the inside of the combustion chamber 6 are provided.

The crane 17 picks up garbage from a garbage pit (not shown), conveys it, and throws it into the hopper 1 . The crane 17 is provided with a weight scale 17a. The weight scale 17 a measures the weight of the garbage conveyed by the crane 17 . The weighing scale 17 a is connected to the control device 20 , and the weight measured by the weighing scale 17 a , that is, the weight of the garbage thrown into the hopper 1 is transmitted to the control device 20 . A sensor 15 is installed above the hopper 1 so as to detect the entire surface of the dust that has been thrown into the hopper 1 and accumulated. A sensor 15 is provided to detect the volume of garbage thrown into the hopper 1 and the height of the garbage accumulated in the hopper 1 and the chute 2 . The sensor 15 is, for example, a LiDAR (Light Detection and Ranging) device. LiDAR is a technology that scans and irradiates an object with a laser beam or the like, and measures the distance and direction to the object based on the brightness of the reflected light. By scanning and irradiating the entire surface of the accumulated dust with laser light using the LiDAR, the distance from the sensor 15 can be measured for the entire surface of the dust. Thereby, the height of the garbage deposited on the hopper 1 and the chute 2 can be detected. Also, the volume of the trash dropped into the hopper 1 can be calculated from the difference in the height of the trash before and after dropping the trash into the hopper 1 from the crane 17 . The sensor 15 is connected to the control device 20 , and the measured values measured by the sensor 15 are transmitted to the control device 20 .

The feeder 10 is a dust feeding device that supplies dust to the fire grate 3 by pushing out the dust supplied through the chute 2 . The feeder 10 repeats the action of pushing out the dust toward the combustion chamber 6 and the action of pulling it back to its original position. The control device 20 adjusts the amount of dust supplied to the combustion chamber 6 by controlling the push-out operation and the pull-back operation of the feeder 10 . A fire grate 3 is provided at the bottom of the chute 2 and the combustion chamber 6 to convey refuse. The fire grate 3 includes a drying zone 3A for drying the waste by evaporating the water content of the waste supplied by the feeder 10, a combustion zone 3B located downstream of the drying zone 3A and burning the dried waste, and a combustion zone 3B. A post-combustion zone 3C is located in the downstream and burns unburned components such as fixed carbon components that have passed through without being burned until they become ash. The operating speed of the grate 3 is controlled by the control of the control device 20 .

The blower 4 is provided below the fire grate 3 and supplies air to each part of the fire grate 3 through the wind boxes 5A to 5E. Branch pipes connecting the pipe 8 and the wind boxes 5A to 5E are connected to the pipe 8 that guides the air sent from the blower 4 to the wind boxes 5A to 5E, and the branch pipes are provided with dampers 8A to 8E, respectively. By adjusting the opening degrees of the dampers 8A-8E, the flow rate of the combustion air supplied to the wind boxes 5A-5E can be adjusted. The control device 20 controls the amount of air blown (rotational speed) of the blower 4 and the opening degrees of the dampers 8A to 8E. The dampers 8A-8E may be collectively referred to as primary combustion air dampers.

The combustion chamber 6 consists of a primary combustion chamber 6A and a secondary combustion chamber 6B above the grate 3, and a boiler 9 is arranged downstream of the combustion chamber 6. The primary combustion chamber 6A is provided above the grate 3, and the secondary combustion chamber 6B is provided further above the primary combustion chamber 6A. In the primary combustion chamber 6A, garbage is burned, and the pyrolysis gas generated in the primary combustion chamber 6A is mixed with the secondary combustion air and sent to the secondary combustion chamber 6B. burn the unburned components of A conduit 14 connecting the blower 4 and the secondary combustion chamber 6B is connected to the secondary combustion chamber 6B of the combustion chamber 6. By opening and closing a damper 14A provided in the conduit 14, the secondary combustion chamber 6B is air can be supplied to The control device 20 controls the opening of the damper 14A. The damper 14A may be described as a secondary combustion air damper. Further, an image sensor 16 is installed at a position where the dust supplied to the combustion chamber 6 can be photographed. Image sensor 16 is connected to control device 20 , and images captured by image sensor 16 are transmitted to control device 20 . Image sensor 16 is, for example, an infrared camera. In the example of FIG. 1, the image sensor 16 is provided at a position for photographing the supply of dust from the front in the horizontal direction. may have been Further, the combustion chamber 6 is provided with a temperature sensor 18 for measuring the temperature inside the combustion chamber 6 . The temperature sensor 18 is connected to the control device 20 , and the temperature inside the furnace measured by the temperature sensor 18 is transmitted to the control device 20 . Further, the combustion chamber 6 is provided with an oxygen concentration sensor 19 for measuring the oxygen concentration inside the combustion chamber 6 . The oxygen concentration sensor 19 is connected to the control device 20 , and the oxygen concentration in the furnace measured by the oxygen concentration sensor 19 is transmitted to the control device 20 .

The boiler 9 exchanges heat between the exhaust gas sent from the combustion chamber 6 and the water circulating in the boiler 9 to generate steam. The steam is supplied through a pipeline 13 to a turbine for power generation (not shown). The pipeline 13 is provided with a steam flow rate sensor 11 that detects the flow rate of steam. The steam flow rate sensor 11 is connected to the control device 20 , and the main steam flow rate measured by the steam flow rate sensor 11 is transmitted to the control device 20 . The control device 20 controls the operation of the feeder 10 and the opening degrees of the primary combustion air damper and the secondary combustion air damper so that the main steam flow rate measured by the steam flow rate sensor 11 becomes a predetermined target value, for example. . An exhaust gas outlet of the boiler 9 is connected to a flue 12, and exhaust gas heat-recovered by the boiler 9 passes through the flue 12, passes through an exhaust gas treatment facility (not shown), and is discharged to the outside.

The control device 20 includes a data acquisition section 21 , a dust height calculation section 22 , an image estimation section 23 , a supply amount estimation section 24 , a determination section 25 , a control section 26 and a storage section 27 .
The data acquisition unit 21 acquires various data such as measurement values measured by the sensors 11, 14a, 15, 16, 17a, 18, and 19 and user instruction values. For example, the data acquisition unit 21 acquires the measured value of the main steam flow rate measured by the steam flow rate sensor 11 .

The dust height calculator 22 calculates the height of dust at each position on the surface of dust accumulated in the hopper 1 and the chute 2 based on the distance to the dust surface detected by the sensor 15 . The height of the dust is the height when the predetermined position of the chute 2 is used as a reference.

The image estimating unit 23 analyzes the image captured by the image sensor 16 and estimates the supply amount (volume, weight) and calorific value (LHV: Lower Heating Value) of the refuse supplied into the furnace by the feeder 10 . For example, the image estimating unit 23 compares images taken before and after the feeder 10 pushes out dust, extracts an image area in which the pushed-out dust is shown, and compares the shape and area of the extracted image area. , based on the output of the feeder 10, the volume of refuse fed into the furnace is estimated. Alternatively, the image estimating unit 23 estimates the volume of dust based on an estimation model constructed by learning the relationship between the image area in which the pushed-out dust is captured and the amount of dust supplied, and the extracted image area. do. The image estimation unit 23 also multiplies the estimated volume by the density calculated by the calculation method described later to calculate the weight of the dust supplied into the furnace. Further, the image estimation unit 23 estimates the calorific value (LHV) from the weight of the refuse supplied into the furnace based on a predetermined conversion formula. Normally, garbage incineration equipment samples the density and calorific value of garbage, analyzes the relationship between the two, and calculates the calorific value from the density of garbage according to the type of garbage processed by the incinerator. is derived. The image estimation unit 23 uses this conversion formula to estimate the amount of heat generated from the weight of the dust obtained by the image analysis. Control using the image estimation unit 23 will be described in the third embodiment.

The supply amount estimator 24 calculates the volume change of the dust in the hopper 1 based on the change in the height of the dust calculated by the dust height calculator 22 . The supply amount estimator 24 estimates the amount of dust supplied into the furnace per unit time based on the volume change of the dust in the hopper 1 . Further, the supply amount estimating unit 24 estimates the density and moisture content of the dust to be supplied into the furnace based on the distribution of the dust in the hopper 1 and the chute 2 and the retention time ΔT of the dust in the hopper 1, For example, the calorific value of waste to be supplied into the furnace in the future is estimated for the residence time. The supply amount estimator 24 estimates the amount of dust supplied and/or the amount of heat generated when the feeder 10 operates this time or after the next time, before the dust is actually supplied into the furnace. As a result, control of the primary combustion air supplied into the combustion chamber 6 and the like can be executed in advance before the dust is supplied to the combustion chamber 6 . The details of the process of estimating the dust supply amount and the calorific value by the supply amount estimating unit 24 will be described in the fourth embodiment.

The determination unit 25 determines whether or not to perform the preceding control for stabilizing the combustion state in the furnace, based on the amount of dust supply and/or the amount of heat generated estimated by the supply amount estimation unit 24 . The determination unit 25 also determines whether or not the combustion state in the furnace has stabilized as a result of the preceding control.

The control unit 26 controls the operation of the feeder 10, the opening degrees of the primary combustion air dampers (dampers 8A to 8E) and the secondary combustion air damper (damper 14A), and the like. The control unit 26 performs preliminary control of the primary combustion air damper and the feeder 10 based on the judgment of the judgment unit 25 . Of the advance control, especially with respect to the primary combustion air, it is better to control the supply amount in advance to an appropriate level so as not to excessively precede, so that the combustion can be stabilized.

The storage unit 27 stores the measurement values acquired by the data acquisition unit 21 and information necessary for control, such as a conversion formula for calculating the amount of heat generated from the density of dust.

<First Embodiment>
Processing (supply control of primary combustion air) according to the first embodiment will be described with reference to FIG.
(motion)
FIG. 2 is a flow chart showing an example of the operation of the control device according to the first embodiment.
The control device 20 executes the following process (preceding control) at predetermined time intervals.

The data acquisition unit 21 acquires the measured value of the sensor 15 and outputs it to the dust height calculation unit 22 . The dust height calculator 22 calculates the height of dust accumulated in the hopper 1 at that point in time based on the measurement value of the sensor 15 , that is, information on the distance from the sensor 15 to the dust surface of the hopper 1 . The dust height calculator 22 outputs the height of dust for each predetermined time to the supply amount estimator 24 . The supply amount estimator 24 estimates the supply amount of dust and/or the amount of heat generated (step S1). For example, the supply amount estimator 24 calculates the amount of dust supplied to the combustion chamber 6 per unit time from the change in the height of the dust per unit time (decrease in height). Further, the supply amount estimator 24 calculates the density of the dust from the volume and weight of the dust measured when the dust is put into the hopper 1, and the dust is supplied after the residence time ΔT calculated by a predetermined method. Calculate the calorific value when At this time, the supply amount estimator 24 determines the density of the dust supplied after the residence time ΔT, the distribution of the dust thrown into the hopper 1 at different timings in the hopper 1 and the chute 2, and the dust thrown into the hopper 1 at different timings. are supplied into the furnace at the same time, and the fact that the waste thrown in at a certain timing moves to the lower part of the chute 2 and is compressed by the weight of the waste thrown in later (consolidation). is used to estimate the density of dust supplied into the furnace (details will be described in the fourth embodiment). The supply amount estimator 24 outputs the estimated supply amount of dust and the amount of heat generated to the determination unit 25 .

Next, the determination unit 25 determines whether the amount of dust supplied per unit time and/or the amount of heat generated by dust supplied after the residence time ΔT increases by a certain amount or more (step S2). For example, the determination unit 25 compares the previously estimated supply amount with the currently estimated supply amount, determines whether the supply amount increases by a certain amount or more, The amounts are compared to determine if the supply increases by a certain amount. For example, if the amount of dust supplied and the amount of heat generated increases by a certain amount or more, or if at least one of the amount of dust supplied or the amount of heat generated increases by a certain amount or more (Step S2; Yes), the control unit 26 continues the current control. If so, it is determined that an excessive combustion state will occur, and the controller 26 is instructed to execute preceding control for suppressing the combustion state. The control unit 26 performs control to decrease the supply amount of the primary combustion air in advance (step S3). For example, the control unit 26 reduces the opening degrees of the dampers 8A to 8E to reduce the amount of air supplied to the combustion chamber 6. FIG. At this time, the control unit 26 may reduce only the opening of the damper 8A in order to reduce the amount of air supplied to the drying area 3A, or may reduce the amount of air supplied to the drying area 3A and the combustion area 3B. Therefore, the opening degrees of the dampers 8A to 8C may be decreased. Further, the control unit 26 may reduce the rotational speed of the blower 4 in addition to/instead of reducing the opening degree of the damper 8A or the like.

The amount of reduction in the degree of opening of the dampers 8A to 8E and the amount of reduction in the rotational speed of the blower 4 are estimated in step S1 based on, for example, a function that defines the relationship between the control amount and the amount of supply and/or the amount of heat generated. It may be determined according to the amount of dust supplied or the amount of heat generated. Further, the control unit 26 may execute control to reduce the opening degree of the damper 8A or the like and the rotation speed of the blower 4 only for a predetermined fixed time, or the amount of dust supplied and/or the amount of heat generated per unit time may be reduced. The control of the damper 8A and the like may be continued until it becomes constant.

In addition, regarding the timing of starting to decrease the opening degree of the damper 8A and the like and decrease the rotational speed of the blower 4, (1) for example, the estimation in step S1 is calculated from the change in the dust height measured by the LiDAR from time to time. In the case of the dust supply amount (volume or weight) based on the volume change, the preceding control may be started immediately after the determination in step S2 (the latest decrease in volume is based on the supply amount put into the furnace immediately before Therefore, starting the advance control at this timing means that the control is started immediately according to the supply amount of the refuse actually thrown into the furnace, which is more advanced than the conventional feedback control. control). (2) In addition, when the calorific value estimated in step S1 is the calorific value, as will be described later in the fourth embodiment, the amount of waste supplied into the furnace after the retention time ΔT after being put into the hopper 1 is calculated. Calorific value can be estimated. In other words, when the waste is put into the hopper 1, the timing at which the waste is supplied into the furnace (after the residence time .DELTA.T) can be known. As a result, the calorific value of the dust that will be supplied into the furnace in the future can be known at a point in time slightly before the dust is about to be supplied into the furnace. , the determination in step S2 may be performed, and the preceding control may be started according to the determination result. The dust to be supplied into the furnace in the near future here means dust existing in pattern 1 in FIGS. 6 and 7, which will be described later. If the pre-control in step S3 is started a predetermined time before the supply timing, the pre-control is started before the dust is actually put into the furnace. Alternatively, the determination in step S2 may be performed in accordance with the dust supply timing estimated based on the residence time ΔT (for example, at the same time as or immediately after the supply), and the preceding control may be started immediately after that. In this case, as in the case of the dust supply amount described in (1), the preceding control is started immediately before or after the dust is thrown into the furnace. (It should be noted that the dust supply amount is not limited to the embodiment in which the determination in step S2 is performed based on the actual value of the dust supply amount based on the dust height change described in (1). Based on this, the judgment of step S2 can be made, and then the preceding control can be started. By estimating the volume and weight of dust existing at a position (that is, the amount of dust to be supplied into the furnace in the future), it is possible to start preemptive control before the dust is actually supplied into the furnace. For example, it is assumed that the dust thrown into the hopper 1 reaches the position of the pattern 1 illustrated in Figs. Shortly before the dust is about to be supplied into the furnace, it is estimated that the calculated supply amount of dust will be supplied into the furnace in the future, and the determination in step S2 is performed a predetermined time before the supply timing. Furthermore, if it can be estimated that the refuse will be thrown into the furnace after a residence time ΔT has elapsed since the refuse was put into the hopper 1, it is necessary to wait until just before the refuse is thrown into the furnace before executing the preceding control. Rather, it is possible to start the advance control earlier. The timing at which the preceding control is started may be arbitrarily adjusted depending on the equipment, the type of dust, and the like. In general, for example, the primary combustion air supply amount is often feedback-controlled so that the main steam flow rate measured by the steam flow rate sensor 11 is constant. Since it is possible to control the primary combustion air according to the amount of supply and the amount of heat generated, the state (atmosphere) of the air in the combustion chamber 6 is adjusted in advance to match the amount of supply of dust and the amount of heat generated. As a result, the combustion state can be stabilized. This also applies to step S7 (when increasing the supply amount of primary combustion air), which will be described later.

Further, the control unit 26 controls the feeder 10 to supply the refuse into the furnace (step S4). For example, the control unit 26 calculates the extrusion rate of the feeder 10 so that the main steam flow rate measured by the steam flow rate sensor 11 becomes a predetermined target value, moves the feeder 10 by the calculated extrusion rate, and enters the furnace. supply garbage. Note that the order of steps S3 and S4 shown in FIG. 2 is for convenience, and the control unit 26 performs control to decrease the supply amount of primary combustion air and control to supply waste into the furnace in parallel. . Next, the determination unit 25 acquires the gas temperature in the combustion chamber 6 measured by the temperature sensor 18 through the data acquisition unit 21 . The determination unit 25 determines whether or not the in-furnace gas temperature remains within a predetermined range for a predetermined time or longer (step S5). If the in-furnace gas temperature remains within the predetermined range for a certain period of time or more (step S5; Yes), the control unit 26 terminates the preceding control (preceding supply of primary combustion air) according to the first embodiment. If the in-furnace gas temperature continues for a certain period of time or more and does not fall within the predetermined range (step S5; No), the control unit 26 repeats the processing from step S3.

Further, in the determination in step S2, if the amount of dust supplied per unit time does not increase by a certain amount or more (step S2; No), the determination unit 25 determines the amount of dust supplied per unit time and/or after the retention time ΔT. It is determined whether or not the calorific value of the dust to be supplied decreases by a certain amount or more (step S6). If the amount of dust supplied and the amount of heat generated decreases by a certain amount or more, or if one of the amount of dust supplied or the amount of heat generated decreases by a certain amount or more (step S6; Yes), the control unit 26 continues the current control. , it determines that the combustion state is deteriorating or declining, and instructs the control unit 26 to execute the preceding control in order to promote combustion in the furnace. The control unit 26 performs control to increase the supply amount of the primary combustion air (step S7). For example, the control unit 26 increases the opening degrees of the dampers 8A to 8E to increase the amount of air supplied to the combustion chamber 6. FIG. At this time, the control unit 26 may increase only the opening degree of the damper 8A in order to increase the amount of air supplied to the drying area 3A, or may increase the amount of air supplied to the drying area 3A and the combustion area 3B. For this reason, the opening degrees of the dampers 8A to 8C may be increased. Further, the control unit 26 may increase the rotational speed of the blower 4 in addition to/instead of increasing the opening degree of the damper 8A or the like.

The amount of increase in the opening of the damper 8A or the like and the amount of increase in the number of rotations of the blower 4 are based on functions that define the relationship between these control amounts and the amount of supply and/or the amount of heat generated. It may be determined according to the amount of supply or the amount of heat generated. Further, the control unit 26 may execute control to increase the opening degree of the damper 8A or the like and the rotation speed of the blower 4 only for a predetermined fixed time, or the amount of dust supplied and/or the amount of heat generated per unit time may be increased. The control of the damper 8A and the like may be continued until it becomes constant. Further, as explained in step S3, the start of increasing the opening degree of the damper 8A and the like and increasing the rotational speed of the blower 4 is started prior to the actual dust supply, or at a timing just before or after the dust supply. Further, the control unit 26 controls the feeder 10 to supply the refuse into the furnace (step S8). For example, the controller 26 controls the feeder 10 based on the main steam flow rate measured by the steam flow rate sensor 11 . The order of steps S7 and S8 shown in FIG. 2 is for convenience, and the control unit 26 performs control to increase the supply amount of primary combustion air and control to supply waste into the furnace in parallel. . Next, the determination unit 25 acquires the gas temperature in the combustion chamber 6 measured by the temperature sensor 18 through the data acquisition unit 21 . The determination unit 25 determines whether or not the in-furnace gas temperature is within a predetermined range for a predetermined time or more (step S9). If the in-furnace gas temperature remains within the predetermined range for a certain period of time or longer (step S9; Yes), the control unit 26 terminates the preceding control (preceding supply of primary combustion air) according to the first embodiment. If the in-furnace gas temperature does not stay within the predetermined range for a certain period of time or more (step S9; No), the control unit 26 repeats the processing from step S7.

Further, in step S6, if the amount of dust supplied per unit time and/or the amount of heat generated by dust supplied after the residence time ΔT does not decrease by a certain amount or more (step S6; No), that is, the amount of dust per unit time If the change in the supply amount or the like is within a certain range, the process returns to step S1. If the determination in step S6 is No, the controller 26 controls the opening of the damper 8A and the feeder 10 so that the main steam flow rate measured by the steam flow rate sensor 11 becomes the target value. The control of the feeder 10 is the same as the control of steps S4 and S8.

In the flowchart of FIG. 2, in steps S2 and S6, the supply amount of the primary combustion air is controlled only when the dust supply amount and the calorific value are above or below a certain level. Then, the relationship between the dust supply amount and/or calorific value and the primary combustion air supply amount is represented by a predetermined function, and based on this function and the supply amount and/or calorific value estimated in step S1, The damper 8A and the like and the blower 4 may be controlled at all times.

According to the first embodiment, before the dust is supplied to the combustion chamber 6, the supply amount of the primary combustion air is adjusted according to the dust supply amount and the calorific value estimated in advance. As a result, an atmosphere that stabilizes the combustion state of the combustion chamber 6 can be created, and the generation of CO and NOx can be suppressed.

<Second embodiment>
Next, referring to FIG. 3, the process (control of primary combustion air and dust supply amount) according to the second embodiment will be described. In the second embodiment, in addition to the primary combustion air, the amount of dust supplied into the combustion chamber 6 is controlled in advance based on the amount of dust supplied and the estimated value of the calorific value.
(motion)
FIG. 3 is a first flow chart showing an example of the operation of the control device according to the second embodiment. The same reference numerals are given to the same processing as in the first embodiment, and a brief description will be given.
The control device 20 executes the following process (preceding control) at predetermined time intervals.

First, the supply amount estimation unit 24 estimates the supply amount of dust and/or the amount of heat generated based on the height of dust measured by LiDAR (step S1). The supply amount estimator 24 outputs the estimated supply amount of dust and the amount of heat generated to the determination unit 25 .

Next, the determination unit 25 determines whether the amount of dust supplied per unit time and/or the amount of heat generated by dust supplied after the residence time ΔT increases by a certain amount or more (step S2). When the amount of dust supplied and/or the amount of heat generated increases by a certain amount or more (step S2; Yes), the control unit 26 performs control to decrease the amount of primary combustion air supplied in advance (step S3). The control unit 26 reduces the opening degrees of the dampers 8A to 8E and the rotational speed of the blower 4 to reduce the supply amount of the primary combustion air.

In parallel with this, the control unit 26 controls the feeder 10 to supply refuse into the furnace, but reduces the amount of refuse supplied into the furnace in order to suppress excessive combustion (step S41). . For example, the controller 26 reduces the stroke of the feeder 10 to reduce the amount of dust supplied to the combustion chamber 6 . Alternatively, the control unit 26 reduces the amount of dust supplied to the combustion chamber 6 by decreasing the moving speed of the feeder 10, or by decreasing both the extrusion amount and the moving speed. may be decreased. Further, the control unit 26 may reduce (temporarily stop) the supply amount of dust by stopping the feeder 10 . For example, the control unit 26 may push out the feeder 10 by half of the normal amount to supply about half of the dust, and stop the feeder 10 at that position for a predetermined time. For example, the control unit 26 may be controlled based on a function defining the relationship between the output amount or moving speed of the feeder 10 and the amount of dust supplied and/or the amount of heat generated, and the amount of dust supplied and the amount of heat generated estimated in step S1. , may control the feeder 10 .

In addition, the control unit 26 may reduce the stroke of the feeder 10 only for a predetermined fixed period of time, or reduce the moving speed of the feeder 10. Alternatively, the feeder 10 may continue to operate until the supply amount and/or the amount of heat generated per unit time become constant. may continue to be executed.

As for the timing of reducing the dust supply amount, the timing is closer to the supply of target dust (dust for which the determination in step S2 is YES) than the timing of starting the control in step S3, or when the dust is supplied. (after dwell time ΔT). For example, in step S1, the amount of dust supplied (volume and weight) is estimated based on the volume change calculated from the height change of dust measured by LiDAR every moment, and this estimated value is supplied to the furnace this time. If it is considered to be the dust supply amount, the preceding control may be started immediately after the determination in step S2.

Further, when the calorific value is estimated in step S1, as described in the fourth embodiment, the calorific value can be estimated according to the amount of waste supplied into the furnace after the residence time ΔT from the introduction into the hopper 1. , the calorific value of the waste that will be supplied into the furnace shortly before or in the future is known. Therefore, the judgment in step S2 is made in advance based on the calorific value of the dust that will be supplied into the furnace in the future. After that, and a predetermined time before the timing of supplying the dust into the furnace (or at the same time as the timing of supplying the dust), the control for reducing the amount of dust supplied may be started. In general, the primary combustion air supply amount and the dust supply amount are often feedback-controlled so that the main steam flow rate measured by the steam flow rate sensor 11 is constant. Since the amount of combustion air and dust supplied can be controlled, the combustion state in the combustion chamber 6 can be stabilized. This also applies to steps S7 and S81, which will be described later.

Next, the determination unit 25 acquires the gas temperature in the combustion chamber 6 measured by the temperature sensor 18 through the data acquisition unit 21 . The determination unit 25 determines whether or not the in-furnace gas temperature remains within a predetermined range for a predetermined time or longer (step S5). If the in-furnace gas temperature remains within the predetermined range for a certain period of time or more (step S5; Yes), the control unit 26 terminates the preliminary control of the primary combustion air and dust supply amount according to the second embodiment. If the in-furnace gas temperature does not fall within the predetermined range for a certain period of time or more (step S5; No), the control unit 26 repeats the processing from step S3.

Further, when the amount of dust supplied per unit time does not increase beyond a certain level (step S2; No), the determination unit 25 determines the amount of dust supplied per unit time and/or the heat generated by the dust supplied after the residence time ΔT. A determination is made as to whether or not the amount has decreased by a certain amount or more (step S6). When the amount of dust supply and/or the amount of heat generated decreases by a certain amount or more (step S6; Yes), the control unit 26 performs control to increase the supply amount of primary combustion air in advance (step S7). The control unit 26 increases the opening degrees of the dampers 8A to 8E or increases the rotational speed of the blower 4 to increase the amount of primary combustion air supplied.

In parallel with step S7, the control unit 26 controls the feeder 10 to supply refuse into the furnace, and increases the amount of refuse supplied into the furnace in order to promote combustion (step S81). For example, the control unit 26 increases the extrusion amount (stroke) of the feeder 10, increases the moving speed of the feeder 10, or increases both the extrusion amount and the moving speed to increase the dust supply amount. For example, the control unit 26 may be controlled based on a function defining the relationship between the output amount or moving speed of the feeder 10 and the amount of dust supplied and/or the amount of heat generated, and the amount of dust supplied and the amount of heat generated estimated in step S1. , may control the feeder 10 . Further, the control unit 26 may perform the above control of the feeder 10 only for a predetermined fixed time, or may perform the above control of the feeder 10 until the amount of supply and/or the amount of heat generated per unit time becomes constant. good too.

As for the timing of increasing the dust supply amount, the controls in steps S7 and S81 may be started in advance, as described in step S41.

Next, the determination unit 25 acquires the gas temperature in the combustion chamber 6 measured by the temperature sensor 18 through the data acquisition unit 21 . The judgment unit 25 judges whether or not the in-furnace gas temperature continues for a certain period of time or more and is within a predetermined range (step S9). When the in-furnace gas temperature remains within the predetermined range for a certain period of time or more (step S9; Yes), the control unit 26 terminates the preceding control (preceding supply of primary combustion air) according to the second embodiment. If the in-furnace gas temperature does not stay within the predetermined range for a certain period of time or more (step S9; No), the control unit 26 repeats the processing from step S7.

Further, in step S6, if the amount of dust supplied per unit time and/or the amount of heat generated by dust supplied after the residence time ΔT does not decrease by a certain amount or more (step S6; No), that is, the amount of dust per unit time If the change in the supply amount or the like is within a certain range, the process returns to step S1. If the determination in step S6 is No, the controller 26 controls the opening of the damper 8A and the like and the feeder 10 based on the steam flow rate measured by the steam flow rate sensor 11 .

Further, in the flowchart of FIG. 2, in steps S2 and S6, the supply amount of the primary combustion air is controlled only when the amount of dust supplied or the amount of heat generated is above or below a certain level. without performing, the relationship between the amount of dust supplied and/or the amount of heat generated and the amount of supply of the primary combustion air is expressed by a predetermined function, and this function and the amount of supply and/or the amount of heat generated estimated in step S1 Based on this, the damper 8A and the like and the blower 4 may be controlled at all times. Similarly, the relationship between the dust supply amount and/or heat generation amount and the stroke or movement speed of the feeder 10 is represented by a predetermined function, and based on this function and the supply amount and/or heat generation amount estimated in step S1 , may control the operation of the feeder 10 .

According to the second embodiment, immediately after estimating the amount of dust to be supplied, or with a certain time delay from when the amount of heat is estimated to when the amount of dust is actually supplied, the estimated amount of supply or amount of heat is changed. Accordingly, by adjusting the dust supply amount in advance in conjunction with the primary combustion air, it is possible to create an atmosphere that stabilizes the combustion state of the combustion chamber 6 and suppress the generation of CO and NOx. .

<Third embodiment>
Next, with reference to FIG. 4, processing according to the third embodiment will be described. In the third embodiment, the preliminary control of the primary combustion air and the like is adjusted according to the amount of dust actually supplied into the furnace. The third embodiment can be combined with either the first embodiment or the second embodiment, and FIG. 4 shows an operation example when combined with the first embodiment.

(motion)
FIG. 4 is a flow chart showing an example of the operation of the control device according to the second embodiment. The same reference numerals are given to the same processing as in the first embodiment, and a brief description will be given.
The control device 20 executes the following process (preceding control) at predetermined time intervals.

First, the supply amount estimation unit 24 estimates the supply amount of dust and/or the amount of heat generated based on the height of dust measured by LiDAR (step S1). The supply amount estimator 24 outputs the estimated supply amount of dust and the amount of heat generated to the determination unit 25 .

Next, the determination unit 25 determines whether the amount of dust supplied per unit time and/or the amount of heat generated by dust supplied after the residence time ΔT increases by a certain amount or more (step S2). When the amount of dust supplied and/or the amount of heat generated increases by a certain amount or more (step S2; Yes), the control unit 26 performs control to decrease the amount of primary combustion air supplied in advance (step S3). The control unit 26 reduces the amount of primary combustion air supplied by reducing the opening degrees of the dampers 8A to 8E and the rotational speed of the blower 4 .

In parallel with this, the control section 26 controls the feeder 10 to supply the refuse into the furnace (step S4). Next, the image estimation unit 23 analyzes the image captured by the image sensor 16 and estimates the amount of dust supplied to the combustion chamber 6 (step S42). The image estimation unit 23 outputs the estimated value of the dust supply amount to the control unit 26 . The control unit 26 adjusts the supply amount of the primary combustion air and/or the secondary combustion air based on the estimated amount of dust supply (step S43). For example, if the estimated dust supply amount is larger than the supply amount estimated in step S1, the opening of the damper 8A or the like is decreased so that the supply amount of the primary combustion air is further decreased, or the rotational speed of the blower 4 is reduced. to reduce Further, the control unit 26 reduces the amount of secondary combustion air supplied in addition to the primary combustion air by reducing the opening degree of the damper 14A, thereby reducing the oxygen concentration in the secondary combustion chamber 6B. conduct. Conversely, if the estimated dust supply amount is less than the supply amount estimated in step S1, adjustment may be made to mitigate the opening of the damper 8A or the like and the reduction in the rotational speed of the blower 4. FIG. Next, the determination unit 25 determines whether or not the in-furnace gas temperature and/or the oxygen concentration have continued for a predetermined time or longer and are within a predetermined range (step S51). The determination unit 25 acquires the temperature in the combustion chamber 6 measured by the temperature sensor 18 and the oxygen concentration in the combustion chamber 6 measured by the oxygen concentration sensor 19 through the data acquisition unit 21, and determines the gas temperature in the combustion chamber 6 and / Or it is determined whether or not the oxygen concentration in the combustion chamber 6 is within a predetermined range. When the in-furnace gas temperature and/or the oxygen concentration are within the predetermined range for a certain period of time or more (step S51; Yes), the control unit 26 terminates the preliminary control of the primary combustion air according to the third embodiment. If the in-furnace gas temperature and/or oxygen concentration continue for a certain period of time or longer and do not fall within the predetermined range (step S51; No), the control unit 26 repeats the processing from step S3.

If the amount of dust supplied per unit time does not increase by a certain amount or more (step S2; No), the determination unit 25 determines that the amount of dust supplied per unit time and/or the amount of heat generated by the dust supplied after the residence time ΔT is A decision is made as to whether or not there is a decrease above a certain level (step S6). When the amount of dust supply and/or the amount of heat generated decreases by a certain amount or more (step S6; Yes), the control unit 26 performs control to increase the supply amount of primary combustion air in advance (step S7). The control unit 26 increases the opening degrees of the dampers 8A to 8E or increases the rotational speed of the blower 4 to increase the amount of primary combustion air supplied.

In parallel with this, the control unit 26 controls the feeder 10 to supply the refuse into the furnace (step S8). Next, the image estimation unit 23 analyzes the image captured by the image sensor 16 and estimates the amount of dust supplied to the combustion chamber 6 (step S82). The image estimation unit 23 outputs the estimated value of the dust supply amount to the control unit 26 . The control unit 26 adjusts the supply amount of the primary combustion air and/or the secondary combustion air based on the estimated amount of dust supply (step S83). For example, if the estimated dust supply amount is smaller than the supply amount estimated in step S1, the opening of the damper 8A or the like is increased to further increase the supply amount of the primary combustion air, or the rotational speed of the blower 4 is increased. to raise the Further, the control unit 26 increases the supply amount of the secondary combustion air in addition to the primary combustion air by increasing the opening degree of the damper 14A, thereby increasing the oxygen concentration in the secondary combustion chamber 6B. conduct. For example, the control unit 26 controls the opening of the damper 14A according to the dust supply amount estimated from the image, based on a function that defines the relationship between the estimated value of the dust supply amount and the opening of the damper 14A. do. Conversely, if the estimated dust supply amount is larger than the supply amount estimated in step S1, the opening of the damper 8A or the like and the increase in the rotation speed of the blower 4 may be adjusted to moderate. Next, the determination unit 25 determines whether or not the in-furnace gas temperature and/or the oxygen concentration remain within a predetermined range for a predetermined time or longer (step S91). The determination unit 25 acquires the temperature in the combustion chamber 6 measured by the temperature sensor 18 and the oxygen concentration in the combustion chamber 6 measured by the oxygen concentration sensor 19 through the data acquisition unit 21, and determines the gas temperature in the combustion chamber 6 and / Or it is determined whether or not the oxygen concentration in the combustion chamber 6 remains within a predetermined range for a predetermined time or longer. When the in-furnace gas temperature and/or oxygen concentration are within a predetermined range for a predetermined time or more (step S91; Yes), the control unit 26 terminates the preliminary control of the primary combustion air according to the third embodiment. If the in-furnace gas temperature and/or oxygen concentration continue for a certain period of time or longer and do not fall within the predetermined range (step S91; No), the control unit 26 repeats the processing from step S7.

According to the third embodiment, the amount of dust supplied and the amount of heat generated are estimated from the image information after the dust is thrown into the furnace, and the secondary air is also controlled, thereby further stabilizing the combustion. can. The amount of dust supplied and the amount of heat generated in step S1 are estimated from the measured value of the distance to the surface of the dust in the hopper 1, but the amount of dust actually supplied to the furnace and the amount of heat generated may deviate. have a nature. In contrast, according to the processing of steps S42, 43, 82, and 83 of the present embodiment, the supply amounts of the primary combustion air and the secondary combustion air are controlled based on the image of the actually supplied dust. Thus, the deviation of the estimated value in step S1 can be compensated.

Further, according to the present embodiment, unlike the method of detecting the volume change from the height of the dust surface of the hopper 1 or detecting the amount of dust supplied into the furnace from the operation of the feeder 10, the actual furnace Since the amount of dust thrown into the chamber is estimated from the image, it is possible to estimate the instantaneous amount of dust supplied, and highly accurate detection of the amount of dust supplied with little time lag is possible.

FIG. 4 shows the operation when combined with the first embodiment. be replaced by Further, in step S43, in addition to adjusting the primary combustion air and the secondary combustion air, the stroke and movement speed of the feeder 10 are adjusted. For example, if the estimated dust supply amount is larger than the supply amount estimated in step S1, the control unit 26 further shortens the stroke of the feeder 10 or slows down the moving speed. Similarly, in step S83, in addition to adjusting the primary combustion air and the secondary combustion air, the stroke and moving speed of the feeder 10 are adjusted. For example, if the estimated dust supply amount is less than the supply amount estimated in step S1, the control unit 26 further lengthens the stroke of the feeder 10 or speeds up the movement speed. When controlling the feeder 10, the control unit 26 adjusts the dust supply amount estimated from the image based on a function that defines the relationship between the estimated dust supply amount and the stroke or moving speed of the feeder 10. It controls the floating feeder 10 .

<Fourth embodiment>
Next, processing according to the fourth embodiment will be described with reference to FIGS. 5 to 7. FIG. In the fourth embodiment, processing of step S1 in the first to third embodiments will be described.
(Estimation method 1)
FIG. 5 is a first diagram for explaining estimation processing of the calorific value of dust and the like according to the fourth embodiment.
A sectional view of the hopper 1 and the chute 2 is shown in the left diagram 50 of FIG. Each of the illustrated layers I1 to I5 is a layer of dust formed by throwing dust into the hopper 1 once. For example, the dust thrown into the hopper 1 five times before forms the layer I5, the dust thrown four times before forms the layer I4, and the dust thrown three times before forms the layer I3. The layer I2 is formed by the dust thrown in two times before, and the layer I1 is formed by the dust thrown in immediately before. In the estimation method 1, the supply amount estimating unit 24 estimates the average residence time ΔT until the newly introduced dust in the layer I1 is supplied into the furnace, and the dust is introduced after the average residence time ΔT. Estimate the heating value (LHV) due to dust that is

(Procedure 1) The dust height calculator 22 momentarily detects the distance from the sensor 15 to the dust surface at each position on the entire dust surface in the hopper 1 by LiDAR. When the dust of the layer I5 is thrown, the supply amount estimator 24 calculates the volume of the thrown-in dust based on the increase in the height of the dust before and after the dust is thrown. Further, the supply amount estimating unit 24 obtains the weight of the dust measured by the weighing scale 17a when the dust on the layer I5 is transported, and divides the weight by the calculated dust volume to obtain the density of the dust on the layer I5. calculate. Similarly, the supply amount estimator 24 calculates the dust density of each layer when the dust of the layers I4 to I1 is thrown. The supply amount estimating unit 24 records the dust density of each layer I1 to I4 in the storage unit 27 . FIG. 51 shows the calculated relationship between dust density and layer. The vertical axis of FIG. 51 indicates the density, and the horizontal axis indicates the position (layer) in the hopper 1 and the chute 2 . The line graph 51a shows, from the left, the density of the layer I5, the density of the layer I4, the density of the layer I3, the density of the layer I2, and the density of the layer I1.

(Procedure 2) The supply amount estimator 24 calculates the calorific value using a conversion formula for calculating the calorific value from the density of each layer and the previously derived dust density. It is generally known that there is a negative correlation between dust density and calorific value. FIG. 52 shows the amount of heat generated according to the dust density of each layer. The vertical axis of FIG. 52 indicates the calorific value (LHV), and the horizontal axis indicates time. FIG. 52 shows, for example, the transition of the calorific value corresponding to the density of the dust supplied into the furnace at each time when the dust is supplied into the furnace at a predetermined supply amount per unit time from the state of FIG. there is The line graph 52a shows, from the left, the amount of heat generated in the layer I5, the amount of heat generated in the layer I4, the amount of heat generated in the layer I3, the amount of heat generated in the layer I2, and the amount of heat generated in the layer I1.

(Procedure 3) Next, the amount of heat generated when each layer of garbage shown in FIG. 50 is actually thrown into the incinerator is calculated. For example, starting from the state where the dust on the layer I5 is at the position of the layer I1 (the dust on the layers I4 to I1 in FIG. 50 is not thrown), after that, dust is thrown on the layers I4 to I1 in order, and each layer I1 The steam flow rate sensor 11 measures the main steam flow rate while the trash in the layers I1 to I5 in FIG. The calorific value (LHV) at each time is calculated using the value divided by the integrated value of time. Note that the method for calculating the calorific value is known, and any known method can be used to calculate the calorific value when the dust in each layer I1 to I5 is burned. FIG. 53 shows the calorific value during combustion of each layer I1 to I5. The vertical axis of FIG. 53 indicates the calorific value (LHV), and the horizontal axis indicates time. A graph 53a shows transition of the calorific value (LHV process value) calculated based on the actual value of the main steam flow rate. The user registers in the storage unit 27 data indicating the transition of the calorific value calculated based on the measured values. Alternatively, the supply amount estimation unit 24 calculates the calorific value illustrated in FIG. 53 and registers it in the storage unit 27 .

(Procedure 4) Next, the supply amount estimation unit 24 moves the graph 52a calculated in the procedure 2 along the time axis, and generates heat calculated based on the graph 52a of the calorific value based on the density of each layer and the flow rate of the main steam. Calculate the degree of correlation with the quantity graph 53a. The supply amount estimator 24 searches for the movement amount ΔT in the graph 52a when the degree of correlation is the largest. ΔT when the degree of correlation is the largest is defined as the average residence time ΔT. Since the retention time varies depending on the amount of waste to be treated, it is necessary to consider changes in the quality of waste and the operation plan. For example, the average residence time ΔT is calculated each time the waste quality or operation plan changes.

(Procedure 5) After calculating the average residence time ΔT, the supply amount estimator 24 calculates the density each time garbage is thrown into the hopper 1, and calculates the calorific value by a conversion formula. Then, the supply amount estimation unit 24 records the calculation result (estimated value) in the storage unit 27 together with the time. Assuming that the present is the time when the feeder is controlled and the dust is supplied, the heat generation amount estimated in the past by the average residence time ΔT is the estimated value of the heat generation amount of the dust to be supplied this time. The supply amount estimating unit 24 reads the estimated value of the amount of heat generated in the past for the average residence time ΔT recorded in the storage unit 27, and estimates the amount of heat generated (step S1 in FIGS. 2 to 4). In addition, the change in the volume of the garbage is calculated based on the change in the height of the garbage due to the current supply of garbage (for example, the unit height x the cross-sectional area of the hopper 1 or the chute 2 is integrated in the height direction by the change in the garbage height. (The cross-sectional areas of the hopper 1 and the chute 2 are known.), and an estimated value of the amount of refuse supplied into the furnace is calculated (step S1 in FIGS. 2 to 4). This is the estimated value of the amount of dust supplied this time.

Alternatively, the supply amount estimating unit 24 records the calculation result of the volume change based on the height change in the hopper 1 per unit time in the storage unit 27 together with the time. The change in volume may be an estimated value of the supply amount of dust to be supplied this time.

(Estimation method 2)
In Estimation Method 1, it is assumed that all the dust thrown into the furnace is dust thrown into the hopper 1 at the same timing, and the density of the dust is assumed to be constant. However, in reality, based on the distribution of the dust in the chute 2, the dust thrown in at different timings is mixed and supplied into the furnace. In estimation method 2, considering the distribution and compaction of the garbage (the density resulting from compression by the garbage thrown in later), the density of the garbage put into the furnace is calculated, and the calculated density of the garbage is converted. Estimate the calorific value of the dust from the formula.

FIG. 6 shows a density calculation method considering the distribution and consolidation of dust. First, as shown in FIG. 60 on the left, a preliminary analysis is performed to model that garbage thrown in at different timings is distributed and accumulated in layers I1 to I5 in the hopper 1 and the chute 2 . Garbage in each layer is the garbage thrown into the hopper 1 from the crane 17 at one time of throwing. Note that I6 and I7 indicate that the dust has already been supplied into the furnace. Further, according to another analysis, when the dust is fed into the furnace by causing the feeder 10 to perform a predetermined operation from the state in which the dust is distributed and accumulated like the layers I1 to I5, the dust is first surrounded by the pattern 1. The dust accumulated in the area is supplied into the furnace next time, the dust accumulated in the area surrounded by pattern 2 is supplied into the furnace the next time, and pattern 3 is further supplied to the area of pattern 4 next time. Analyze that the dust is fed into the furnace by the fourth feeder control. Patterns 1 to 4 are examples of supply patterns assuming a certain amount of output from the feeder 10 at one time. When analyzed in this way, in pattern 1, which is the next scheduled supply range, dust on layers I3 to I5 is to be supplied. Further, by another analysis, a weighted moving average coefficient (dust input ratio) regarding the rate of dust on layers I3 to I5 when dust of pattern 1 is supplied in advance is calculated (FIG. 62). As an example, FIG. 62 is a graph showing the weighted moving average coefficients of the layers I1 to I7 at each time when the dust volumes of the layers I1 to I7 are the same (all the maximum weighted moving average coefficients are 0.1). shown in The vertical axis of FIG. 62 is the load moving average coefficient, and the horizontal axis is time (the time during which the refuse is supplied into the furnace by the feeder 10). In the graph of FIG. 62, each mountain corresponds to dust on each layer, and in the example of FIG. 62, each mountain corresponds to layers I7 to I1 in order from the leftmost mountain. The height of each pile has a positive correlation with the size of the volume of the garbage thrown in, and if the volume of garbage thrown into the hopper 1 differs each time, the peak value of the pile will differ each time. Also, the overlap of each pile is related to the ratio of the dust thrown into the furnace at that time. For example, if the throwing time of pattern 1 shown in FIG. From the value on the vertical axis at the time corresponding to the axis, it is possible to grasp the dust input ratio (loaded moving average coefficient) of layers I3 to I5. When the weighted moving average coefficients of I3 to I5 at the time when the dust in the range enclosed by pattern 1 is supplied from FIG. 62 are examined, the values in the first row of Table 61 are obtained. Similarly, the weighted moving average coefficients of layers I1 to I7 in patterns 2 to 4 are shown in rows 2 to 4 of Table 61.

Further analysis yields dust densities g1-g7 that take into account the consolidation of layers I1-I7. For example, density g1 is the density of dust in layer I1 considering consolidation, density g2 is the density of dust in layer I2 considering consolidation, . . . , density g7 is the density of dust in layer I7 considering consolidation. Given a dust distribution pattern (for example, pattern 1) fed into the furnace and the weighted moving average coefficient of each layer in that pattern (Table 61), the dust density of this pattern is given by the dust density of each layer gX ( (X=1 to 7) multiplied by the weighted moving average coefficient is divided by the total weighted moving average coefficient of the pattern. For example, in the case of pattern 1, the following equation (1) can be used to calculate the dust density G when dust within the range of pattern 1 is fed into the furnace.
G = (g1 x 0 + g2 x 0 + g3 x 0.01 + g4 x 0.1 + g5 x 0.04 +
g6×0+g7×0)÷(0.01+0.1+0.04) (1)

Reference is now made to FIG. The left figure 70 shows the dust layers I1 to I5 in the hopper 1 and the chute 2. FIG. The vertical axis in FIG. 71 indicates density, and the horizontal axis indicates time. The line graph 71a shows, from the left, the density of the layer I5, the density of the layer I4, the density of the layer I3, the density of the layer I2, and the density of the layer I1. These are called densities A. Density A is the density of dust on the top layer at that time. For example, when the layer I5 is thrown in at a certain time, the height is lowered moment by moment according to the supply of refuse into the furnace. It shows the density of dust on the top layer in such a cycle.

The vertical axis in FIG. 72 is residence time, and the horizontal axis is time. A graph 72a is the residence time until the dust at each position (height) in FIG. 71 is supplied into the furnace. Residence time can be calculated by dividing the volume of debris present from the debris position (height) to the furnace entrance at the corresponding time in FIG. 71 by the average daily volume change rate.

Then calculate the density B after the dwell time calculated for each position in each layer. FIG. 73 shows the transition of density B. FIG. The vertical axis in FIG. 73 is density, and the horizontal axis is time. Density B is the density of dust just before it is fed into the furnace. For example, if the dust supplied into the furnace is in the range of pattern 1, the density can be calculated by the above equation (1). Assuming that the position of "X1" min of layer I4 in FIG. 72 is included in pattern 1, it can be seen that pattern 1 is thrown into the furnace after "X1" minutes. Then, the density B after "X1" minutes can be calculated by the above equation (1) using the weighted moving average coefficient of pattern 1 in Table 61 illustrated in FIG. Similarly, the density B in other pattern 2 and so on can be calculated. In this way, when a certain layer of dust is introduced (in the case of pattern 1, when the relevant layers I5 to I3 are introduced), the density B after a certain residence time can be calculated in advance. The supply amount estimating unit 24 calculates the residence time until the dust put into the hopper 1 is supplied into the furnace based on a certain time and the density B of the dust when it is supplied into the furnace, Graph 73a of FIG. 73 is obtained. Next, the supply amount estimation unit 24 calculates the calorific value based on the calculated density B at each time and the conversion formula. The calculated calorific value is shown in graph 74a of FIG. In this way, according to the estimation method 2, the residence time of dust, the density B considering the distribution and consolidation of dust, and the calorific value corresponding to the density B can be estimated in advance.

Next, the procedure of estimation method 2 will be described. The supply amount estimator 24 estimates the calorific value of dust in the following procedure. The distribution of dust in the hopper 1 and the chute 2 (I1 to I5) illustrated in FIG. , is recorded in the storage unit 27 .

(Procedure 1) The dust height calculator 22 detects the distance from the sensor 15 to the dust surface at each position on the entire dust surface in the hopper 1 every moment by LiDAR, and calculates the height of the dust. The supply amount estimator 24 calculates the volume and density of dust.

(Procedure 2) The supply amount estimator 24 divides the total volume of the residual waste in the hopper by the daily average volume change rate (m ³ /unit time) to calculate the estimated retention time.

(Procedure 3) Based on the calculated residence time and FIG. 62, the supply amount estimator 24 calculates the density of the dust to be thrown into the furnace after the residence time by using the compaction of the dust in the hopper 1 and the weight moving average density. . For example, the supply amount estimation unit 24 selects dust supply patterns 1-4. By applying the residence time corresponding to the selected pattern to the horizontal axis of FIG. 62, the weighted moving average coefficient is determined and the dust density according to the pattern is estimated. For example, in the case of pattern 1, the supply amount estimation unit 24 estimates the dust density of pattern 1 using equation (1). The supply amount estimating unit 24 may analyze the consolidation g1 to g7 of the dust at each distribution position necessary for this calculation, the relationship between the input time and the input ratio (FIG. 62), or may use these separately analyzed information. You may perform calculation of procedure 3 using it.

(Step 4) The supply amount estimator 24 selects the pattern of dust to be supplied to the furnace. For example, the supply amount estimator 24 selects pattern 1 as the next dust pattern to be supplied to the furnace. The supply amount estimation unit 24 selects the dust density of pattern 1 estimated in procedure 3 .

(Procedure 5) The supply amount estimator 24 estimates the calorific value based on the dust density of the selected pattern and the conversion formula. Further, the supply amount estimation unit 24 may estimate the input fuel flow rate (kJ/h), which is the flow rate of the fuel (waste) supplied into the furnace.

In Estimation Method 2, the residence time was calculated by dividing the remaining amount of dust (volume) by the daily average volume change rate. Then, it is detected that the dust at the position of interest (for example, dust at the bottom end of layer I4) moves to the position immediately before input (for example, the position included in the range of pattern 1). At the timing when the position is reached, the calorific value and supply amount of the next thrown-in dust may be estimated. With this method, the timing of starting the advance control is just before the supply to the combustion chamber 6, but the estimation accuracy can be improved.

According to the present embodiment, the density of refuse supplied in the furnace (dust By estimating the calorific value of the dust from the moisture content), more accurate estimation becomes possible.

FIG. 8 is a diagram illustrating an example of a hardware configuration of a control device according to each embodiment;
A computer 900 includes a CPU 901 , a main memory device 902 , an auxiliary memory device 903 , an input/output interface 904 and a communication interface 905 .
The control device 20 described above is implemented in a computer 900 . Each function described above is stored in the auxiliary storage device 903 in the form of a program. The CPU 901 reads out the program from the auxiliary storage device 903, develops it in the main storage device 902, and executes the above processing according to the program. Also, the CPU 901 secures a storage area in the main storage device 902 according to the program. In addition, the CPU 901 secures a storage area for storing data being processed in the auxiliary storage device 903 according to the program.

A program for realizing all or part of the functions of the control device 20 is recorded in a computer-readable recording medium, and the program recorded in this recording medium is read by a computer system and executed. Processing by the functional unit may be performed. The "computer system" here includes hardware such as an OS and peripheral devices. The "computer system" also includes the home page providing environment (or display environment) if the WWW system is used. The term "computer-readable recording medium" refers to portable media such as CDs, DVDs, and USBs, and storage devices such as hard disks incorporated in computer systems. Further, when this program is distributed to the computer 900 via a communication line, the computer 900 receiving the distribution may develop the program in the main storage device 902 and execute the above process. Further, the program may be for realizing part of the functions described above, or may be capable of realizing the functions described above in combination with a program already recorded in the computer system. .

Although several embodiments of the present disclosure have been described above, all these embodiments are provided by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof.

<Appendix>
For example, the control device 20 described in each embodiment is understood as follows.

(1) The control device 20 for the incinerator facility (garbage incineration facility) according to the first aspect includes a furnace (combustion chamber 6, fire grate 3) that conveys while burning the incinerator (garbage), and the furnace A control device 20 for an incinerator facility 1 having a combustion air supply unit (damper 8A to 8F, blower 4, damper 14A) that supplies combustion air, wherein the supply amount of the incinerator to be supplied to the furnace or A combustion air control unit (control unit 26) for controlling the combustion air before the incinerator is put into the furnace based on the amount of heat generated.
As a result, the atmosphere in the furnace (inside the combustion chamber 6) can be adjusted according to the amount of dust supplied and the amount of heat generated before the dust is supplied, and the combustion in the furnace can be stabilized.

(2) The control device 20 according to the second aspect is the control device 20 of (1), wherein the feeder that supplies the incinerator to the furnace and the A feeder control unit (control unit 26) that controls the operation of the feeder is further provided.
As a result, the amount of dust supplied can be adjusted according to the amount of dust supplied and the amount of heat generated when the dust is supplied, and combustion in the furnace can be stabilized.

(3) The control device 20 according to the third aspect is the control device 20 of (1) to (2), in which imaging means (image sensor 16 ) and an estimating unit (image estimating unit 23) for estimating the supply amount or calorific value of the incineration material put into the furnace from the image information obtained by the imaging means, and the combustion air The control unit controls the combustion air (primary combustion air, secondary combustion air) based on the supplied amount of the incinerated material or the calorific value estimated by the estimation unit.
By controlling the combustion air according to the amount of dust actually supplied into the furnace, the combustion in the furnace can be stabilized with high accuracy.

(4) The control device 20 according to the fourth aspect is the control device 20 of (1) to (3), in which the height of the incinerated matter in the hopper (inside the hopper 1 and the chute 2) is determined by three-dimensional measurement. Detecting the change in thickness, the consolidation of the incinerated matter (g1 to g7), the distribution of the incinerated matter in the hopper (I1 to I7), and the ratio of the incinerated matter supplied into the furnace (input 4. The incineration facility according to any one of claims 1 to 3, further comprising a calculation unit (supply amount estimating unit) that calculates the supply amount or the calorific value immediately before being supplied into the furnace based on the ratio) controller.
As a result, it is possible to estimate the amount of supplied dust and the amount of heat generated before supplying the dust.

(5) The control device 20 according to the fifth aspect is the control device 20 of (4), wherein the calculation unit detects the distance of the entire surface of the incineration object by LiDAR (Light Detection and Ranging). , based on the change in the distance, calculate the volume of the incinerated material put into the hopper, calculate the density from the weight and volume of the incinerated material put into the hopper, and calculate the density for a certain period of time in the past Then, the calorific value estimated from the density of the material to be incinerated supplied to the furnace is correlated with the actually measured calorific value, and the material to be incinerated is supplied to the furnace after being put into the hopper. The residence time until the end of the residence time is estimated, and the calorific value after the residence time is estimated.
Thereby, the calorific value of the refuse supplied to the furnace after the residence time can be estimated, and the control of the primary combustion air can be started before the refuse is supplied to the furnace.

100 Garbage incineration facility 1 Hopper 2 Chute 3 Fire grate 3A Dry zone 3B Combustion zone 3C Post-combustion zone 4 ···Blower,
5A to 5E wind box, 6 combustion chamber, 7 ash outlet, 8A to 8E, 14A damper, 9 boiler, 10 feeder, 11 steam Flow rate sensor 12... Flue 13, 14... Pipe line 15... Sensor (LiDAR) 16... Image sensor 17... Crane 17a... Weight scale 18. Temperature sensor 19 Oxygen concentration sensor 20 Control device 21 Data acquisition unit 22 Dust height calculation unit 23 Image estimation unit 24 Supply amount estimation unit 25 Determination unit 26 Control unit 27 Storage unit 900 Computer 901 CPU 902 Main storage device 903 Auxiliary storage device 904 Input/output interface 905 Communication interface

A control device of the present disclosure is a control device for an incinerator facility having a furnace for burning and conveying incinerators and a combustion air supply unit for supplying combustion air to the furnace, wherein A combustion air control unit that controls the combustion air before the incineration material is put into the furnace based on the supply amount or calorific value of the incineration material , and the three-dimensional measurement of the air in the hopper Detecting a change in the height of the incinerator, calculating the volume of the incinerator thrown into the hopper based on the change in the height of the incinerator, and calculating the volume of the incinerator thrown into the hopper Calculate the density from the weight and the volume of the object, and perform a correlation comparison between the calorific value estimated from the density of the incinerator supplied to the furnace during a certain past period and the actually measured calorific value, By estimating the residence time from when the incinerator is put into the hopper until it is supplied to the furnace, the consolidation of the incinerator, the distribution of the incinerator in the hopper, and the distribution of the incinerator in the furnace a calculation unit that calculates the supply amount or calorific value of the incineration material supplied into the furnace after the residence time based on the ratio of the supplied incineration material, wherein the combustion air control unit Controlling the combustion air based on the supply amount or calorific value of the incinerator a predetermined time before the retention time estimated by the calculating unit has elapsed since the incinerator was put into the hopper conduct.

Claims (5)

A control device for an incinerator facility having a furnace for burning and conveying materials to be incinerated and a combustion air supply section for supplying combustion air to the furnace,
a combustion air control unit that controls the combustion air before the incineration material is introduced into the furnace based on the supply amount or calorific value of the incineration material supplied to the furnace;
A control device for an incinerator facility. 2. The control device for incinerator equipment according to claim 1, further comprising: a feeder that supplies said incinerated material to said furnace; imaging means for imaging a state in which the incinerator is put into the furnace;
an image estimating unit for estimating a supply amount or a calorific value of the incineration material put into the furnace from image information obtained by the imaging means;
The combustion air control unit controls the combustion air based on the supplied amount of the incinerated material after input or the amount of heat generated estimated by the image estimation unit.
The control device for incinerator equipment according to claim 1 or 2. A three-dimensional measurement is used to detect changes in the height of the incinerated matter in the hopper, and the consolidation of the incinerated matter, the distribution of the incinerated matter in the hopper, and the incineration matter supplied into the furnace. 4. The control device for incinerator equipment according to any one of claims 1 to 3, further comprising a calculator that calculates the supply amount or the calorific value immediately before supply into the furnace based on the ratio. The calculation unit detects the distance of the entire surface of the incineration material by LiDAR (Light Detection and Ranging), calculates the volume of the incineration material put into the hopper based on the change in the distance, The density is calculated from the weight and volume of the incineration material put into the hopper, and the calorific value estimated from the density of the incineration material supplied to the furnace during a certain period of time in the past is actually measured. performing a correlation comparison of the calorific value, estimating the residence time from when the incinerator is put into the hopper until it is supplied to the furnace, and estimating the calorific value after the residence time;
The control device for an incinerator facility according to claim 4.

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