JP7347339B2 - Grate type waste incinerator and waste incineration method using grate type waste incinerator - Google Patents

Description

The present invention relates to a grate-type waste incinerator and a waste incineration method using the grate-type waste incinerator.

BACKGROUND ART Grate-type waste incinerators have been widely used as incinerators for incinerating waste such as municipal garbage.

In this grate-type waste incinerator, for example, in Patent Document 1, the inside of the furnace is imaged with an infrared camera, information on the layer thickness of the waste is acquired from the image of the inside of the furnace, and information on the drying of the waste is acquired. By acquiring the information and adjusting the operating conditions of the incinerator using at least one of the layer thickness information and the drying information, it is possible to stably burn the waste.

In addition, according to the technology disclosed in Patent Document 1, the operating conditions for stably burning waste include the waste supply speed by the pusher of the dust feeder, the waste conveyance speed of the grate, and the The air volume and temperature are listed. By appropriately adjusting these operating conditions, the layer thickness and drying state of the waste on the grate can be kept within a predetermined range.

By the way, in the technology disclosed in Patent Document 1, when controlling the dust feeder based on waste layer thickness information, only the waste supply speed by the dust feeder, that is, only the reciprocating speed of the pusher is controlled. are doing. In addition, the feed distance (stroke width) of the pusher is constant, and it reciprocates back and forth between two fixed positions, and while moving forward, it pushes out the waste on the receiving bed and supplies it to the combustion chamber. Since the frontmost position is set behind the front end of the receiving bed, there was a structural issue in that even if the front end of the pusher reached the most forward position, waste remained on the receiving bed in front of the pusher. . Therefore, in order to ensure stable combustion of waste in the combustion chamber, the amount of waste supplied to the combustion chamber by the pusher, that is, the thickness of the layer of waste accumulated on the upstream side of the grate must always be adjusted appropriately. It was necessary to maintain it within a certain range.

Patent No. 6429039

However, in the technique disclosed in Patent Document 1, the frontmost position of the pusher is set behind the front end of the receiving bed, so it is not easy to adjust the amount of waste to be supplied. For example, when the pusher reaches its forward position, the amount of waste deposited upstream on the grate is less than the appropriate amount, that is, the waste layer thickness is small. In this case, it is necessary to supply more waste at an early stage, but since the pusher is temporarily retreated from the frontmost position, the waste cannot be supplied at an early stage. On the other hand, if the amount of waste deposited upstream on the grate reaches the appropriate amount before the pusher reaches its forward position, i.e., the waste layer thickness reaches the appropriate thickness. does not require any more waste to be fed for a while, but as the pusher continues to advance to the frontmost position, more waste is fed onto the grate than necessary, causing an excessive amount of waste. There is a risk that it will become. In other words, there was a problem in stably supplying waste onto the grate.

The present invention has been made in view of the above circumstances, and it is possible to stably obtain an appropriate thickness of the waste layer by operating the pusher according to the supply status of waste onto the grate. An object of the present invention is to provide a grate-type waste incinerator and a waste incineration method using the grate-type waste incinerator.

According to the present invention, the above-mentioned problems are solved by the following grate-type waste incinerator and waste incineration method.

<Grate type waste incinerator>
A fire grate comprising: a combustion chamber that includes a fire grate and burns waste on the fire grate; and a dust feeder located upstream of the combustion chamber and equipped with a pusher that pushes out the waste toward the fire grate. In the type waste incinerator, an infrared camera is provided on the downstream wall of the combustion chamber to obtain thermal image information of the waste on the grate, and an infrared camera is installed on the downstream wall of the combustion chamber to acquire thermal image information of the waste on the grate; A data processing device that obtains a measured layer thickness value as an actual layer thickness value, and a control device that controls operating conditions for burning waste based on the measured layer thickness value, the control device comprising: The measured layer thickness value is compared with a preset appropriate target layer thickness range, and if the measured layer thickness value is higher than the target layer thickness range, the amount of waste on the grate is excessive. If it is determined that there is, and the stroke width of the pusher as the operating condition is decreased, and the measured layer thickness value is lower than the target layer thickness range, it is determined that the amount of waste on the grate is too small. A grate type waste incinerator, wherein the stroke width of the pusher is increased as the operating condition.

In the present invention, the target layer thickness range may be set so that the amount of heat held by the waste on the grate falls within a predetermined range based on the estimated amount of heat held per unit volume of the waste.

In the present invention, the target layer thickness range is set based on the estimated amount of heat retained per unit volume of the waste, and from the correspondence between the amount of heat per unit volume during a stable combustion period in the past and the layer thickness of the waste. Good too.

In the present invention, the estimated amount of heat retained per unit volume of the waste may be determined based on heat input to the incinerator calculated from heat output from the incinerator.

In the present invention, the estimated amount of heat retained per unit volume of the waste is determined based on the moisture content of the waste obtained with a moisture meter installed in a chute for introducing the waste into the incinerator. Good too.

In the present invention, the operating conditions controlled by the control device may include the feed speed of the pusher in addition to the stroke width of the pusher.

<Waste incineration method>
A fire grate comprising: a combustion chamber that includes a fire grate and burns waste on the fire grate; and a dust feeder located upstream of the combustion chamber and equipped with a pusher that pushes out the waste toward the fire grate. In a waste processing method using a type waste incinerator, thermal image information of the waste on the grate is acquired with an infrared camera provided on the downstream wall surface of the combustion chamber, and a data processing device is used from the thermal image information. Obtain an actual layer thickness value as an actual value of the thickness of the waste layer on the upstream side of the grate, and control operating conditions for burning the waste by a control device based on the actual layer thickness value. , the control device compares the measured layer thickness value with a preset appropriate target layer thickness range, and if the measured layer thickness value is higher than the target layer thickness range, the control device removes waste on the grate. It is determined that the amount of waste is too large, the stroke width of the pusher is reduced as the operating condition, and if the measured layer thickness value is lower than the target layer thickness range, the amount of waste on the grate is too small. A method for incinerating waste using a grate-type waste incinerator, in which it is determined that the operating conditions are such that the stroke width of the pusher is increased.

According to the present invention, the pusher of the dust feeder is actuated according to the supply status of waste onto the grate, and the grate-type waste incineration can stably obtain an appropriate thickness of the waste layer. A method of incinerating waste using a furnace and a grate waste incinerator can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical cross-sectional view showing a schematic configuration of a grate-type waste incinerator according to an embodiment of the present invention.

Embodiments of the present invention will be described below based on the accompanying drawings. Note that the technical scope of the present invention is not limited by these embodiments, and can be implemented in various forms without changing the gist of the invention. Furthermore, the technical scope of the present invention extends to equivalent ranges.

FIG. 1 is a vertical cross-sectional view showing a schematic configuration of a grate-type waste incinerator according to an embodiment of the present invention. In the grate type waste incinerator 1 shown in Fig. 1 (hereinafter referred to as "incinerator 1"), the left side in Fig. 1 is the upstream side in the direction of movement of waste in the combustion chamber 2 (furnace length direction). The right side of FIG. 1 is the downstream side.

The incinerator 1 includes a combustion chamber 2 and a chute 4 disposed upwardly on the upstream side of the combustion chamber 2 in the movement direction of the waste (left side in FIG. 1) for charging waste into the combustion chamber 2. , a waste inlet 3 formed at the upper end of the chute 4, and a waste heat inlet connected to the combustion chamber 2 above the downstream side (right side in FIG. 1) in the movement direction of waste in the combustion chamber 2. This is a grate-type waste incinerator equipped with a boiler (not shown). A dust feeder 4B, which will be described later, is provided on a receiving bed 4A located at the lower end of the chute 4. A moisture meter 4D is provided on the inner wall of the chute 4 to measure the moisture content of the input waste.

A fire grate (stoker) 5 is provided at the bottom of the combustion chamber 2 to move and burn the waste. The grate 5 is provided in the order of the drying grate 5a, the combustion grate 5b, and the post-combustion grate 5c from the side closer to the waste inlet 3, that is, from the upstream side, and is mainly provided with the drying grate 5a and A waste layer W is formed above the combustion grate 5b. These fire grates 5a to 5c are interlocked by a drive mechanism (not shown) to direct the waste forward and convey it downstream.

The drying grate 5a is mainly used for drying and igniting waste. The combustion grate 5b mainly performs thermal decomposition and partial oxidation of waste, burns combustible gas and combustible solids generated by the thermal decomposition, and forms a flame when the combustible gas burns. On the post-combustion grate 5c, the unburned combustible solids in the remaining waste are completely combusted. When the solid content in the waste is combusted, no flame is generated and it burns fiercely. The incinerated ash after being completely burned is discharged from the ash outlet 6 located downstream of the post-combustion grate 5c.

A wind box group 7 including wind boxes 7a, 7b, and 7c is provided below the drying grate 5a, combustion grate 5b, and post-combustion grate 5c in the combustion chamber 2. The combustion primary air P supplied by the blower 8 is supplied to each wind box 7a, 7b, 7c through the combustion primary air supply pipe 9, and is then supplied into the combustion chamber 2 through each grate 5a, 5b, 5c. supplied to The amount of primary combustion air P supplied into the combustion chamber 2 is adjusted by a damper 11 provided in the primary combustion air supply pipe 9 for adjusting the amount of primary air supplied. The temperature of the primary combustion air P is adjusted by controlling the heat exchange conditions with, for example, steam generated in a boiler in the primary air heating device 16. The primary combustion air P supplied from below the grate is used to dry and burn the waste on the grate 5a, 5b, 5c, and also to cool the grate 5a, 5b, 5c and stir the waste. has.

A waste heat boiler (not shown) is connected to the outlet on the downstream side of the combustion chamber 2. This is a secondary combustion chamber 10 that burns gas). In the secondary combustion chamber 10, which is a part of the waste heat boiler, a secondary combustion gas is blown into the secondary combustion chamber 10, and unburned gas is subjected to secondary combustion. The combustion exhaust gas generated by the secondary combustion generates steam when heat is recovered in a waste heat boiler, and this steam is used for power generation in a generator. After heat recovery, the combustion exhaust gas discharged from the waste heat boiler is neutralized with acidic gas using slaked lime, etc. in an exhaust gas treatment system (not shown), and dioxins are adsorbed with activated carbon, and then sent to a dust removal device (not shown). Neutralization reaction products, activated carbon, dust, etc. are collected. After the dust has been removed by the dust removal device and the combustion exhaust gas has been made harmless, it is attracted by an attraction fan (not shown) and released into the atmosphere from the chimney.

The incinerator 1 according to the present embodiment has a primary air blowing means for supplying primary air P for combustion into the furnace from below the grate 5, and a receiving bed 4A for the waste input from the waste input port 3. Dust feeder 4B equipped with a pusher that sends out toward the grate 5 from above, a drive mechanism for the grate 5 (not shown), an infrared camera 13 that acquires thermal image information of the waste on the grate 5, an infrared camera a data processing device 14 that obtains an actual layer thickness value as an actual measurement value of the thickness of the waste layer W on the upstream side above the grate 5 from the thermal image information acquired by the device 13; It has a control device 15 that compares the range and controls the pusher of the dust feeder 4B.

Here, the "target layer thickness range" is a range of the appropriate layer thickness of the waste layer W to maintain a stable combustion state of waste in the combustion chamber 2, and is set in advance as a target range. Ru. The target layer thickness range can be set based on the estimated heat content per unit volume of the waste input from the waste input port 3 so that the heat content of the waste on the grate 5 falls within a predetermined range. . At this time, the target layer thickness range is, for example, based on the estimated amount of heat retained per unit volume of waste, the amount of heat retained per unit volume of waste during the past stable combustion period on the grate 5, and the layer of waste. It can be set based on the relationship with the thickness. In addition, the estimated amount of heat retained per unit volume of waste can be determined based on the heat input to the incinerator 1 calculated from the heat output of the incinerator 1, or can be determined using the moisture meter 4D installed in the chute 4. It can also be determined based on the moisture content of the waste obtained.

As seen in FIG. 1, the dust feeder 4B has a rod-shaped pusher that reciprocates in the front-rear direction (rightward and leftward in FIG. 1) directly above the receiving bed 4A located at the lower end of the chute 4. are doing. The pusher repeats reciprocating motion with a stroke width between the extrusion start point (left end position) and the extrusion end point (right end position), and when it moves forward (advance toward the combustion chamber 2), it pushes out the waste and moves it inside the combustion chamber 2. The drying grate 5a is dropped onto the upstream portion of the drying grate 5a (the left end side portion in FIG. 1). The dust feeder 4B is connected to a pusher drive device 4C controlled by a control device 15. In this embodiment, the pusher drive device 4C is controlled by the control device 15, so that the stroke width of the pusher of the dust feeder 4B is variable, and by changing (increasing or decreasing) the stroke width, waste is removed to the drying grate 5a. It is possible to adjust the amount of supplies.

The infrared camera 13 is disposed on the downstream side wall 2A of the combustion chamber 2. This infrared camera 13 may be disposed outside the furnace close to the monitoring window provided on the side wall 2A, or may have a water-cooled structure and be disposed inside the furnace. The infrared camera 13 has a measurement field of view that extends in the vertical direction of the furnace and in the furnace width direction (direction perpendicular to the paper surface), and obtains thermographic information of the waste layer W on the grate in this measurement field of view as thermal image information. be able to. Since the wavelength of the infrared rays emitted from the waste layer W is different from the wavelength of the infrared rays emitted from the high-temperature gas in space and the flame, the infrared camera 13 can detect the flame within the field of view by appropriately selecting the infrared wavelength to be measured. Even if there exists thermal image information corresponding to the temperature distribution only for the waste layer W, it is possible to obtain thermal image information corresponding to the temperature distribution only for the waste layer W. Further, by setting the measurement range in the furnace length direction by the infrared camera 13, thermal image information about the waste layer W on the drying grate 5a in the entire waste layer W can be obtained.

A data processing device 14 for processing the obtained thermal image information is connected to the infrared camera 13. The data processing device 14 processes the thermal image information received from the infrared camera 13 to recognize the surface position of the waste layer W on the grate 5, and based on the shape and dimensions of the waste layer W, Obtain the measured layer thickness value.

Data processing device 14 is connected to control device 15 . The control device 15 receives the measured layer thickness value of the waste layer W from the data processing device 14, determines whether the measured layer thickness value is within a predetermined target layer thickness range, and in accordance with the determination result, incinerates the waste layer W. The operating conditions of the furnace 1 are controlled. The control device 15 is configured to send command signals for controlling the pusher drive device 4C, the drive mechanism for the grate 5 (not shown), the damper 11 of the primary air blowing means, and the primary air heating device 16. 4C, a drive mechanism for the grate 5, a damper 11, and a primary air heating device 16. In this embodiment, the operating conditions of the incinerator 1 controlled by the control device 15 include the stroke width of the pusher of the dust feeder 4B, the feeding speed of the grate 5, the opening degree of the damper 11, and the heat in the primary air heating device 16. Exchange conditions have been set.

Next, the acquisition of the measured layer thickness value of the waste layer, the control of the dust feeder, etc. in the apparatus of this embodiment configured as described above will be explained.

First, when waste is thrown into the chute 4 from the waste inlet 3, the waste that has fallen onto the receiving bed 4A is ignited by the dry fire in the combustion chamber 2 due to the reciprocating movement of the pusher of the dust feeder 4B. It is supplied and deposited on the grid 5a. The accumulated waste sequentially moves onto the combustion grate 5b and then onto the post-combustion grate 5c during the reciprocating movement of each grate 5a to 5c, forming a waste layer W on each grate. . Primary air P for combustion, whose flow rate is controlled by a damper 11 and heated by a primary air heating device 16, is supplied from below each of the fire grates 5a to 5c via wind boxes 7a, 7b, and 7c. The waste on each grate is dried and burned.

The infrared camera 13 obtains thermal image information (thermography information) of the waste layer W on the grate 5 over the entire waste layer W. As mentioned above, the wavelength of the infrared rays emitted from the waste layer W and the wavelength of the infrared rays emitted from the high temperature gas in space and the flame are different, so the infrared camera 13 selects the wavelength to be measured to determine which wavelength is within the measurement field of view. Even if flame is present, thermal image information corresponding to the temperature distribution only for the waste layer W can be obtained.

When the thermal image information in the measurement field obtained by the infrared camera 13 is sent to the data processing device 14, the data processing device 14 converts this thermal image information into the vertical axis (vertical axis) of the furnace and the furnace width axis (horizontal axis). The distribution of the surface position of the waste layer W in the furnace width direction from the boundary between the waste layer W and the space is determined for the entire range in the furnace length direction. Next, the data processing device 14 converts the distribution in the furnace width direction of the surface position of the waste layer W on the grate 5 into an actual layer thickness value as an actual value of the thickness of the waste layer (waste layer thickness). Convert. At this time, the measured layer thickness value is calculated, for example, as the average value in the oven width direction of the oven width direction distribution of the surface position of the waste layer W.

The measured layer thickness value of the waste layer W obtained by the data processing device 14 is sent to the control device 15. The control device 15 controls the pusher drive device 4C based on the measured layer thickness value of the waste layer W on the upstream side of the grate 5 so that the measured layer thickness value falls within the target layer thickness range, and Adjust the stroke width of the pusher of machine 4B.

At this time, the control device 15 compares the measured layer thickness value obtained by the data processing device 14 with a preset appropriate target layer thickness range, and if the measured layer thickness value is higher than the target layer thickness range, , it is determined that the amount of waste on the grate 5 is excessive, and the pusher drive device 4C is controlled to change the operating condition to reduce the stroke width of the pusher. Therefore, if the pusher is moving forward (forward movement), the pusher moves backward (backward movement) as soon as it reaches the front end position of the stroke width after the change, that is, without reaching the front end position of the stroke width before the change. Start. As a result, the amount of waste supplied to the combustion chamber 2 can be reduced at an early stage, and the measured layer thickness value can be kept within the target layer thickness range. On the other hand, if the measured layer thickness value is lower than the target layer thickness range, the control device 15 determines that the amount of waste on the grate 5 is too small, and increases the stroke width of the pusher as an operating condition. Therefore, when the pusher is moving forward (moving forward), the pusher continues to move forward until it reaches the front end position of the stroke width after the change, that is, even after reaching the front end position of the stroke width before the change. As a result, the amount of waste supplied to the combustion chamber 2 can be increased early, and the measured layer thickness value can be kept within the target layer thickness range.

The operating conditions controlled by the control device 15 may include the feed speed of the pusher in addition to the stroke width of the pusher of the dust feeder 4B. By controlling the feed speed of the pusher in this manner, it becomes possible to bring the measured layer thickness value within the target layer thickness range even earlier. The feed speed of this pusher is adjusted by the control device 15 controlling the pusher drive device 4C. Specifically, when the measured layer thickness value is higher than the target layer thickness range, that is, when the amount of waste on the grate 5 is excessive, the amount of waste supplied to the combustion chamber 2 is reduced. Then, the feed rate of the pusher is reduced. On the other hand, if the measured layer thickness value is lower than the target layer thickness range, that is, if the amount of waste on the grate 5 is too small, the pusher The feed rate of is increased.

In this embodiment, the control device 15 sets the grate 5 as an operating condition other than the stroke width of the pusher of the dust feeder 4B based on the actually measured layer thickness value of the waste layer W on the upstream side of the grate 5. Since the feed speed, opening degree of the damper 11, and heat exchange conditions in the primary air heating device 16 are also controlled, it becomes possible to bring the measured layer thickness value within the target layer thickness range even earlier.

Specifically, when the measured layer thickness value is higher than the target layer thickness range, that is, when the amount of waste on the grate 5 is excessive, the control device 15 reduces the amount of waste on the grate 5. In order to do this, the feed speed by the grate 5 is increased. Further, in order to promote the combustion of waste on the grate 5, the opening degree of the damper 11 and the supply amount of primary combustion air are increased, and the temperature of the primary combustion air in the primary air heating device 16 is raised. On the other hand, if the measured layer thickness value is lower than the target layer thickness range, that is, if the amount of waste on the grate 5 is too small, the control device 15 controls the control device 15 to increase the amount of waste on the grate 5. , the feed rate by the grate 5 is reduced. Furthermore, in order to suppress the combustion of waste on the grate 5, the opening degree of the damper 11 and the supply amount of primary combustion air are reduced, and the temperature of the primary combustion air in the primary air heating device 16 is lowered. Note that it is not essential that all of the feeding speed of the grate 5, the opening degree of the damper 11, and the heat exchange conditions in the primary air heating device 16 be controlled, and only some of these may be controlled. You can leave it there.

In this embodiment, the target layer thickness range is set as a range having a constant width, but this "target layer thickness range" also includes a case where the upper limit value and the lower limit value are equal. Therefore, the target layer thickness range may be set as a constant target layer thickness value without width. In this case, the control device determines whether the amount of waste on the grate is too large or too small based on the level of the measured layer thickness value relative to the target layer thickness value.

1 Incinerator 2 Combustion chamber 4 Chute 4B Dust feeder 4D Moisture meter 13 Infrared camera 14 Data processing device 15 Control device

Claims (8)

A fire grate comprising: a combustion chamber that includes a fire grate and burns waste on the fire grate; and a dust feeder located upstream of the combustion chamber and equipped with a pusher that pushes out the waste toward the fire grate. In the type waste incinerator,
an infrared camera provided on a downstream wall surface of the combustion chamber to obtain thermal image information of waste on the grate;
a data processing device that obtains an actual layer thickness value as an actual value of the thickness of the waste layer on the upstream side of the grate from the thermal image information;
a control device that controls operating conditions for burning waste based on the measured layer thickness value ,
The control device compares the measured layer thickness value with a preset appropriate target layer thickness range, and if the measured layer thickness value is higher than the target layer thickness range, the control device controls the amount of waste on the grate. is determined to be excessive, the stroke width of the pusher is reduced as the operating condition, and if the measured layer thickness value is lower than the target layer thickness range, the amount of waste on the grate is too small. determining that the stroke width of the pusher as the operating condition is increased ;
The target layer thickness range is set based on the estimated amount of heat retained per unit volume of waste, and from the correspondence between the amount of heat retained per unit volume of waste during a stable combustion period in the past and the layer thickness of the waste.
Grate type waste incinerator. The target layer thickness range is set so that the amount of heat held by the waste on the grate falls within a predetermined range based on the estimated amount of heat held per unit volume of the waste.
The grate type waste incinerator according to claim 1. The estimated amount of heat retained per unit volume of the waste is determined based on the heat input to the incinerator calculated from the heat output of the incinerator.
The grate type waste incinerator according to claim 1 or 2. A fire grate comprising: a combustion chamber that includes a fire grate and burns waste on the fire grate; and a dust feeder located upstream of the combustion chamber and equipped with a pusher that pushes out the waste toward the fire grate. In the type waste incinerator,
an infrared camera provided on a downstream wall surface of the combustion chamber to obtain thermal image information of waste on the grate;
a data processing device that obtains an actual layer thickness value as an actual value of the thickness of the waste layer on the upstream side of the grate from the thermal image information;
a control device that controls operating conditions for burning waste based on the measured layer thickness value,
The control device compares the measured layer thickness value with a preset appropriate target layer thickness range, and if the measured layer thickness value is higher than the target layer thickness range, the control device controls the amount of waste on the grate. is determined to be excessive, the stroke width of the pusher is reduced as the operating condition, and if the measured layer thickness value is lower than the target layer thickness range, the amount of waste on the grate is too small. determining that the stroke width of the pusher as the operating condition is increased;
The target layer thickness range is set so that the amount of heat held by the waste on the grate falls within a predetermined range, based on the estimated amount of heat held per unit volume of the waste,
The estimated amount of heat retained per unit volume of the waste is determined based on the heat input to the incinerator calculated from the heat output of the incinerator.
Grate type waste incinerator. The estimated amount of heat retained per unit volume of the waste is determined based on the moisture content of the waste obtained with a moisture meter installed in the chute that feeds the waste into the incinerator.
The grate type waste incinerator according to any one of claims 1 to 4. The operating conditions controlled by the control device include a stroke width of the pusher and a feed rate of the pusher .
The grate type waste incinerator according to any one of claims 1 to 5 . A fire grate comprising: a combustion chamber that includes a fire grate and burns waste on the fire grate; and a dust feeder located upstream of the combustion chamber and equipped with a pusher that pushes out the waste toward the fire grate. In a waste treatment method using a type waste incinerator,
acquiring thermal image information of the waste on the grate with an infrared camera provided on the downstream wall surface of the combustion chamber;
Obtaining a measured layer thickness value as an actual measured value of the thickness of the waste layer on the upstream side of the grate by a data processing device from the thermal image information,
controlling operating conditions for burning waste by a control device based on the measured layer thickness value;
The control device compares the measured layer thickness value with a preset appropriate target layer thickness range, and if the measured layer thickness value is higher than the target layer thickness range, the control device controls the amount of waste on the grate. is determined to be excessive, the stroke width of the pusher is reduced as the operating condition, and if the measured layer thickness value is lower than the target layer thickness range, the amount of waste on the grate is too small. determining that the stroke width of the pusher as the operating condition is increased ;
The target layer thickness range is based on the estimated heat capacity per unit volume of waste, and is set based on the correspondence between the heat capacity per unit volume of waste and the layer thickness of waste during stable combustion periods in the past. Using a lattice waste incinerator
Waste incineration method. A fire grate comprising: a combustion chamber that includes a fire grate and burns waste on the fire grate; and a dust feeder located upstream of the combustion chamber and equipped with a pusher that pushes out the waste toward the fire grate. In a waste treatment method using a type waste incinerator,
acquiring thermal image information of the waste on the grate with an infrared camera provided on the downstream wall surface of the combustion chamber;
Obtaining a measured layer thickness value as an actual measured value of the thickness of the waste layer on the upstream side of the grate by a data processing device from the thermal image information,
controlling operating conditions for burning waste by a control device based on the measured layer thickness value;
The control device compares the measured layer thickness value with a preset appropriate target layer thickness range, and if the measured layer thickness value is higher than the target layer thickness range, the control device controls the amount of waste on the grate. is determined to be excessive, the stroke width of the pusher is reduced as the operating condition, and if the measured layer thickness value is lower than the target layer thickness range, the amount of waste on the grate is too small. determining that the stroke width of the pusher as the operating condition is increased;
The target layer thickness range is set so that the amount of heat held by the waste on the grate falls within a predetermined range, based on the estimated amount of heat held per unit volume of the waste,
The estimated amount of heat retained per unit volume of the waste is determined based on the heat input to the incinerator calculated from the heat output of the incinerator using a grate type waste incinerator.
Waste incineration method.

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