JP2002357312A - Stoker type incinerator and method for incinerating thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stoker type incinerator and a method for incinerating thereby capable of improving incineration efficiency of the incinerator, reducing an unburnt content of combustible gas, and relieving an environment load by decreasing an air introduction amount and increasing temperature in the incinerator. SOLUTION: In the stoker type incinerator, a substance to be incinerated is supplied in to a combustion chamber 7 through a refuse feed opening 2, is dried and thermally decomposed and further burnt while being sequentrally moved on a plurality of stoker stages having a wind box provided below. An air feed control part is provided to adjust the feed amount of air fed through the wind box to the substance to be incinerated stacked on the drying stage 4 of the stoker stages positioned at least in the vicinity of the refuse feed opening 2 for drying and thermal decomposition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stoker-type incinerator used for incineration of incinerated materials such as municipal garbage and industrial waste, and an incineration method using the stoker-type incinerator. about stoker incinerator and incineration method according thereto for reducing the amount of combustible gas.

[0002]

2. Description of the Related Art Conventionally, a stoker type incinerator having a plurality of stoker stages having a wind box below has been widely used as an incinerator for incinerating incinerated materials such as municipal waste and industrial waste. I have. This stoker-type incinerator has a drying stoker stage (hereinafter, referred to as a "drying stage"), a combustion stoker stage (hereinafter, referred to as a "combustion stage"), and a post-combustion stoker stage (hereinafter, referred to as a "combustion stage"), which are inclined backward and downward at a lower portion of a combustion chamber. , Referred to as “post-combustion stage”) in tandem in the front-rear direction, providing a trash supply port at the entrance of the drying stage, and an ash outlet at the exit of the post-combustion stage,
A secondary combustion chamber is provided above the combustion chamber.

In the stoker-type incinerator of this configuration, the incineration material supplied from the dust supply port moves sequentially from the dust supply port on each of the drying, combustion and post-combustion stages. , Drying and pyrolysis are performed and further burned. The incineration material supplied from the dust supply port to the front of the drying stage is dried in the drying stage by primary air from below and radiant heat in the furnace. In particular, since urban garbage contains about 50% of water, the water is evaporated, and at the same time, a part of the thermal decomposition is also performed in this drying stage. After that, the combustion stage
It is ignited in the dust by the primary air supplied, to burn the volatiles and the fixed carbon content. Post-combustion stage, burning until complete ash unburned having passed through without being burned (mainly fixed carbon content). Further, the pyrolysis gas generated in the combustion chamber reaches the secondary combustion chamber is mixed with the secondary air where it is burned.

[0004] A wind box is provided below each of the storage stages, and outside air is introduced into the wind box using a blower or the like to cool the grate or to burn air for burning the incinerated material. For this purpose, primary air is supplied from the grate of each stoker stage. This primary air is introduced from a common blower into each wind box in each stoker stage. Also, the secondary combustion chamber, in order to burn the unburnt gas that can not be burned in the main combustion chamber, the outside air is supplied as secondary air.

[0005] In recent years, it has become essential to improve the efficiency of incinerators and reduce their environmental burden. In particular, it is an urgent task to reduce the amount of exhaust gas such as unburned gas and harmful gas. In order to control such pollutants such as dioxins, it is necessary to reduce the unburned portion of combustible gas. To do so, it is necessary to raise the temperature inside the furnace and reduce the amount of air introduced. Is desirable.

As a method for reducing the amount of exhaust gas by raising the temperature in the furnace, for example, it is known that oxygen or oxygen-enriched air is supplied as primary air or secondary air to promote oxidation. An example of this is disclosed in JP-A-3-244.
913, and the like. This uses high-concentration oxygen and / or ozone as all or a part of the primary air and secondary air, detects the exhaust gas temperature and the amount of flue gas in the secondary combustion chamber, and supplies the high-concentration oxygen and / or ozone. by adjusting the amount of combustion exhaust gas in the secondary combustion chamber to a high temperature control - it is intended to Le.

[0007]

However, it is desirable to blow out more primary air in order to evaporate the moisture of the refuse in the drying stage and sufficiently dry it to promote ignition. When the primary air supply amount increases, the amount of air introduced that does not contribute to combustion increases, and the furnace temperature also decreases. In addition, if the primary air supply to the drying stage is reduced, the air pressure from the wind box weakens even if the amount of air introduced can be reduced, so that sufficient air is supplied to the entire incineration material stacked in the drying stage. not spread, so that thereby reduces the burning efficiency leads to incomplete combustion as a result. In such a state, even if oxygen or oxygen-enriched air is supplied as primary air as described in JP-A-3-244913 described above, it is necessary to blow out a predetermined amount of oxygen or oxygen-enriched air from the drying stage. no change in, it is inherently difficult to reduce the air introduction amount. Therefore, the effect of reducing the amount of exhaust gas is not enough, and the primary air blown out from the drying stage is
Since this is still a factor that hinders the high temperature inside the combustion chamber, there has been a problem that much unburned gas is brought into the secondary combustion chamber and the control of pollutants is not sufficient.

The present invention has been made in view of the above-mentioned circumstances, and is intended to reduce the amount of air introduced and to raise the temperature in the furnace, improve the incineration efficiency of the furnace, and reduce the amount of combustible gas. reducing unburned, there is provided a stoker incinerator and incineration method according thereto aim to reduce environmental impact.

[0009]

According to a first aspect of the present invention, there is provided a stoker-type incinerator, wherein an incinerator supplied from a dust supply port into the combustion chamber is blown downward in the combustion chamber by a wind box. In a stoker type incinerator in which drying and thermal decomposition are performed while sequentially moving over a plurality of stoker stages having a stoker stage, and the stoker type incinerator further burns, the stoker stage performing the drying and thermal decomposition at least near the refuse supply port An air supply control unit that adjusts the supply amount of air supplied through the wind box to the incineration materials stacked in the drying stage is characterized by having an air supply control unit. Here, the air supply control unit is desirably adjusts the supply amount of the air for example so as to intermittently or periodically changed.

According to this configuration, the amount of introduced air can be reduced, and air can be sufficiently distributed to the entire incineration material stacked in the drying stage. That is, in order to adjust the air supply amount so that the incineration material stacked in the drying stage is changed intermittently or periodically, for example, when the air supply amount is large, the incineration material is stirred. It encourages the dried sufficiently so spread air across Te, as a whole, it is possible to reduce the air supply amount. In other words, incomplete combustion does not occur, and the amount of air introduced can be reduced. Therefore, reducing the air introduction amount can be high temperature in the furnace, to improve the incineration efficiency of the furnace,
Reducing unburned combustible gas, it is possible to obtain a stoker incinerator of Reducing the environmental impact.

According to a second aspect of the present invention, in the stoker type incinerator according to the first aspect, the wind box located below at least one of the stoker stages has a width perpendicular to a moving direction of the incinerated material. The air supply control unit adjusts the supply amount of air to be supplied through each of the divided wind boxes so as to be respectively changed. It is characterized by being. Here, it is desirable that the air supply control unit adjusts the supply amount of air to be supplied to each wind box, for example, intermittently or periodically.

According to this configuration, the amount of air introduced can be further reduced and the incineration efficiency of the furnace can be improved as compared with the case of the first aspect. Normally, the incineration material supplied from the dust supply port is not always stacked uniformly in the width direction orthogonal to the moving direction of the incineration material, and the stacking height near the center in the width direction is the highest. It has a Yamagata distribution. Therefore, even if the primary air is supplied from the wind box, the air flow resistance is large and the air hardly flows in the place where the layer height of the incinerated material is high, and conversely, the layer height near the end in the width direction is high. is a place in the low, a phenomenon that air is likely to flow into for air flow resistance is low is generated. As a result, the incinerated material near the center in the width direction tends to be incompletely burned, and the primary air not contributing to combustion tends to flow in from the vicinity of the end in the width direction.
However, in order to adjust the supply amount of the air to be supplied through each of the wind boxes divided in the width direction, for example, intermittently or periodically, the supply amount is adjusted according to the lamination height in the width direction. It is possible to optimize the amount of air. Therefore, a stoker-type incinerator that can further reduce the amount of introduced air and improve the incineration efficiency of the furnace can be obtained as compared with the case of the first aspect.

According to a third aspect of the present invention, there is provided a method for incineration by a stoker-type incinerator, wherein the incineration material supplied from the refuse supply port into the combustion chamber is transferred to a plurality of stoker stages having wind boxes below in the combustion chamber. Is a stoker type incinerator in which drying and thermal decomposition are performed while sequentially moving the stoker, and further burning is performed, wherein the drying is a stoker stage which is located at least near the refuse supply port and performs the drying and thermal decomposition. against the material to be incinerated are laminated in stages, and adjusting to intermittently vary the supply amount of the air supplied through the windbox. The incineration method using a stoker-type incinerator according to a fourth aspect is characterized in that the intermittently changing the supply amount of air in the third aspect is adjusted so as to be periodically changed.

According to these incineration methods, the amount of air introduced can be reduced, and air can be sufficiently spread throughout the incineration materials stacked in the drying stage. That is, in order to adjust the supply amount of air to intermittently or periodically change the incineration material stacked in the drying stage, when the air supply amount is large, the incineration material is agitated and sufficiently with disseminating air, as a whole, it is possible to reduce the air supply amount. In other words, incomplete combustion does not occur, and the amount of air introduced can be reduced. Therefore, it is possible to reduce the amount of air introduced, raise the temperature inside the furnace, improve the incineration efficiency of the furnace, reduce the amount of unburned combustible gas, and reduce the environmental burden. A method can be provided.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram schematically showing a cross section of the stoker-type incinerator 1 for explaining the stoker-type incinerator 1 according to the present invention. In FIG. 2, a stoker type incinerator 1 includes a trash supply port 2 and a pusher type trash transport machine 3.
The main combustion chamber 7 is followed by a main combustion chamber 7, and a secondary combustion chamber 8 is provided above the main combustion chamber 7. The main combustion chamber 7 is connected to an exhaust pipe (not shown). Garbage supply port 2 is open, the transport speed is made to be controlled by the waste transporter 3 that follows.

The main combustion chamber 7 is provided with stair steps 4, 5, and 6 extending downward and inclining in order from the dust supply port 2. Each of the storage means 4, 5, and 6 comprises a total of three stages of a drying stage 4, a combustion stage 5, and a post-combustion stage 6, starting from the one closest to the dust supply port 2. the material to be incinerated is fed to the front end of the drying stage 4, are sequentially transported to the combustion stage 5 and afterburning stage 6.

The main combustion chamber 7 connected to the secondary combustion chamber 8
The upper wall 30 has a structure in which the generated pyrolysis gas is inclined upward to the secondary combustion chamber 8 to cover the main combustion chamber 7 so that the generated pyrolysis gas is easily guided to the secondary combustion chamber 8 and burned. ing. At the inlet of the secondary combustion chamber 8, a secondary air inlet 20 for supplying secondary air toward the main combustion chamber 7 is provided. The unburned portion contained in the combustion gas generated by the combustion in the combustion stage 5 and the post-combustion stage 6 is completely burned by the secondary air supplied from this, and then discharged from an exhaust pipe (not shown).

In FIG. 2, each of the drying stage 4, the combustion stage 5 and the post-combustion stage 6 installed in the main combustion chamber 7 has wind boxes 4a, 5a and 6a thereunder, from which primary air is blown. Is supplied. Each of the storage stages 4, 5, and 6 is provided with a movable grate (not shown) and a fixed grate (not shown) alternately. The incineration material supplied from the port 2 can be sequentially transported rearward on the drying stage 4, the combustion stage 5 and the post-combustion stage 6 while stirring the incinerated material. Each strike - feeding speed of the material to be incinerated by mosquito stages 4, 5 and 6, it is capable of controlling arbitrarily the longitudinal movement speed of the movable grate. In addition, each wind box 4a, 5
A conveyor 29 capable of collecting ash and the like falling from a gap between the grate via a damper 28 is connected below the a and 6a.

Here, a mechanism for supplying primary air to each of the wind boxes 4a, 5a, 6a corresponding to each of the stocker stages 4, 5, 6 will be described with reference to FIG. In Figure 1, primary air is supplied to each windbox through the primary air pipe 50 from the primary air blower (not shown). At this time, each distribution pipe 50 is connected to each wind box 4a, 5a, 6a from the pipe 50.
a, 50b, and 50c. Each distribution pipe 50a, 50b, the 50c, supplies the primary air amount adjustable control valves 51a, 51b, 5
1c are provided respectively. Each control valve is a solenoid valve, the valve opening command of the respective solenoid valves are respectively provided by the air supply control unit 52, 53. In the present embodiment, as shown in FIG. 1, an air supply control unit 52 for the control valve 51a and an air supply control unit 53 for the control valves 51b and 51c give a valve opening command. Has become.

The air supply control unit 52 gives an opening degree command of the control valve 51a so as to be repeatedly turned on and off, so that the supply amount of air supplied to the wind box 4a is intermittently changed. I have. Also, in the air supply control unit 53, similarly to the air supply control unit 52,
Control valve 51b, the opening command of 51c, by giving to repeat on and off, wind box 5a, 6
It becomes possible to intermittently change the supply amount of the air supplied to a. Incidentally, both air control unit 52 and 53, the opening command of the control valves may be one that gives so as to change periodically. As described above, the stoker-type incinerator 1 according to the present embodiment is configured.

Next, the stoker-type incinerator 1 having the above-described structure.
The incineration process of the incinerated material according to the above will be described below. First of all, in FIG.
Drying stage 4 so as to be extruded by the garbage transporter 3 through
Supplied above. In this drying stage on 4, evaporates the moisture of the incinerated in, together with the ignition is promoted, some thermal decomposition is performed. The drying step is to dry by heat transfer form of primarily two types is promoted. One is due to the primary air supplied from the wind box 4a. The primary air is supplied while being heated to a predetermined temperature by an external heating device (not shown). Then, the drying of the incinerated in process from drying stage 4 to the main combustion chamber 7 through the object to be incinerated. The other is due to radiant heat radiated from the heated upper surface wall 30 to the surface layer of the incineration moving in the drying stage 4.

At this time, in FIG. 1, the air supply control unit 52 sends an opening degree command of the control valve 51a to
It is given to repeat on and off. Here, the on-time and off-time are given on the basis of a pattern determined in advance in accordance with the supply amount of the object to be incinerated. Thereby, the supply amount of the air supplied to the wind box 4a is adjusted so as to be intermittently changed. For this reason, it is possible to reduce the amount of introduced air and to sufficiently spread the air throughout the incineration materials stacked in the drying stage. That is, in order to adjust the air supply amount so as to intermittently change the incineration materials stacked in the drying stage, when the air supply amount is large, the incineration materials are agitated and the air is sufficiently supplied to the whole. To promote drying and to reduce the amount of air supply as a whole. In other words, incomplete combustion does not occur, and the amount of air introduced can be reduced.

Next, the incinerated after completing the drying step, is moved to the combustion stage 5. Here, it ignited by the primary air supplied from the wind box 5a, volatiles and fixed carbon content is combusted. Then, after this, the post-combustion stage 6, the unburned having passed through without being burned is burned completely to become ash. Further, the pyrolysis gas generated in the combustion chamber 7 is mixed with secondary air reaches the secondary combustion chamber 8, where it is burned. In the combustion stage 5 and the post-combustion stage 6 as well, the air supply control unit 53 sends the opening commands of the control valves 51b and 51c similarly to the air supply control unit 52.
On and off are repeated as appropriate.

The above is the incineration process of the incinerated material by the stoker-type incinerator 1 according to the present embodiment. According to this, the amount of air introduced can be reduced and the inside of the furnace can be heated to a high temperature. It is possible to obtain a stoker-type incinerator that improves the incineration efficiency of slag, reduces unburned combustible gas, and reduces environmental load. Further, since the amount of air introduced can be reduced and the temperature of the combustion exhaust gas can be increased, the effect of improving the efficiency of a boiler or the like for heating the primary air can also be obtained. The description of the above embodiment also serves as an explanation of the embodiment of the incineration method using the stoker-type incinerator according to the present invention.

Further, the embodiment is not limited to the above, for example, it may be implemented in the following forms.

[0026] (1) In the present facilities embodiment, as shown in FIG. 1, the supply of primary air to the windbox 5a is distributed pipe 50
b, and the air supply amount is determined by periodic adjustment of the valve opening of the control valve 51b controlled based on a command from the air supply control unit 53. However, as shown in another embodiment example of FIG. 3, the wind box 5a is divided into a plurality of pieces in a width direction orthogonal to the moving direction of the incineration object 54, and is arranged so as to be parallel to the moving direction. The air supply control unit 53 may adjust the supply amount of air supplied through each of the divided wind boxes so as to intermittently or periodically change. In this case, the distribution pipe 50b for supplying primary air to windbox 5a further pipe 55a, 55b, 5
5c, and these pipes are divided into divided wind boxes 56, respectively.
a, 56b, 56c. And the pipe 55
Control valves 57a, 57b, and 57c are provided in the control valves a, 55b, and 55c, respectively, and these control valves are turned on and off repeatedly by the air supply control unit 53, or the air supply amount is periodically controlled. Is controlled to increase or decrease. The control of the amount of air supplied to each divided wind box may be performed in a separate and independent pattern, or may be performed in a mutually dependent relationship. If you have made a mutual to control by remembering dependencies, for example, split-style box 56a, 56b,
By sequentially supplying air to 56c, effects such as suppressing pressure fluctuations in the primary air supply system can be obtained.

According to this alternative embodiment, the amount of air introduced can be further reduced and the incineration efficiency of the furnace can be improved as compared to the case of this embodiment. Normally, the incineration material supplied from the dust supply port is not always stacked uniformly in the width direction orthogonal to the moving direction of the incineration material, and the stacking height near the center in the width direction is the highest. It has a Yamagata distribution. Therefore, even if the primary air is supplied from the wind box, the air flow resistance is large and the air hardly flows in the place where the layer height of the incinerated material is high, and conversely, the layer height near the end in the width direction is high. is a place in the low, a phenomenon that air is likely to flow into for air flow resistance is low is generated. As a result, the incinerated material near the center in the width direction tends to be incompletely burned, and the primary air not contributing to combustion tends to flow in from the vicinity of the end in the width direction. However, in order to adjust the supply amount of air to be supplied through each of the wind boxes divided in the width direction so as to intermittently or periodically change, the supply amount of the air to be supplied is adjusted in accordance with the lamination height in the width direction. It is possible to optimize the amount.

(2) In the present embodiment, the supply amount of primary air is adjusted by giving a valve opening command to the control valve so as to repeat ON and OFF. However, the present invention is not limited to this example. For example, a type that gives a valve opening command in a sine curve, or a type that changes in a stepwise manner so as to periodically reduce the flow rate with respect to a normal flow rate may be used. Good. Even in this case, the same effects as in the present embodiment can be obtained.

(3) In the present embodiment, the valve opening is controlled based on a pattern set in advance according to the supply amount of the incineration material and the like. However, the present invention is not necessarily limited to the present embodiment. For example, the static pressure of a wind box is measured to estimate the thickness of the stacked incineration objects, and the air supply amount is accordingly determined. May be configured to adjust the valve opening so as to intermittently change.

(4) In another embodiment of FIG. 3, the structure of the wind box 5a of the combustion stage 5 is divided into a plurality of parts in the width direction. However, this structure is not necessarily applied only to the wind box 5a. It does not need to be applied, and may be applied to the wind box 4a of the drying stage 4 or the wind box 6a of the post-combustion stage 6.

(5) In FIGS. 1 and 2, the stoker-type incinerator is described as a type in which the stoker stages are sequentially lowered in a stepwise manner. Also, the apparatus and method of the present invention can be applied.

(6) In FIGS. 1 to 3, the wind boxes in each of the stoker stages are exemplified by those arranged one by one or those arranged in parallel.
The wind boxes may be arranged in series.
Further, even if the combustion stage 5 afterburning stage 6 is a stoker incinerator of the type integral, it can be applied apparatus and method of the present invention.

[0033]

As described above, according to the stoker type incinerator of the first aspect, the amount of air introduced can be reduced, and air can be sufficiently distributed throughout the incineration material stacked in the drying stage. It is possible to make it. That is,
In order to adjust the amount of air supplied to the incineration material stacked in the drying stage, for example, intermittently or periodically, when the air supply amount is large, the incineration material is agitated and encourages the dried sufficiently so spread the air, as a whole, it is possible to reduce the air supply amount. In other words, incomplete combustion does not occur, and the amount of air introduced can be reduced. Therefore, it is possible to obtain a stoker-type incinerator that can reduce the amount of introduced air, raise the temperature inside the furnace, improve the incineration efficiency of the furnace, reduce the unburned portion of combustible gas, and reduce the environmental load. be able to.

[0034] According to stoker incinerator according to claim 2, in comparison with the case of claim 1, further reduce the air introduction amount,
Furnace incineration efficiency can be improved. Normally, the incineration material supplied from the dust supply port is not always stacked uniformly in the width direction orthogonal to the moving direction of the incineration material, and the stacking height near the center in the width direction is the highest. It has a Yamagata distribution. Therefore, even if the primary air is supplied from the wind box, the air flow resistance is large and the air hardly flows in the place where the layer height of the incinerated material is high, and conversely, the layer height near the end in the width direction is high. is a place in the low, a phenomenon that air is likely to flow into for air flow resistance is low is generated. As a result, the incinerated material in the vicinity of the center in the width direction is liable to be incompletely burned, and the primary air not contributing to the combustion is likely to flow in from the vicinity of the end in the width direction. However, in order to adjust the supply amount of the air to be supplied through each of the wind boxes divided in the width direction, for example, intermittently or periodically, the supply amount is adjusted according to the lamination height in the width direction. It is possible to optimize the amount of air. Therefore, a stoker-type incinerator that can further reduce the amount of introduced air and improve the incineration efficiency of the furnace can be obtained as compared with the case of the first aspect.

According to the incineration method in the stoker type incinerator according to the third or fourth aspect, it is possible to reduce the amount of air introduced and to sufficiently spread the air throughout the incineration material stacked in the drying stage. become. That is,
In order to adjust the amount of air supplied intermittently or periodically to the incineration material stacked in the drying stage, when the air supply amount is large, the incineration material is stirred and sufficient with disseminating air, as a whole, it is possible to reduce the air supply amount. In other words, incomplete combustion does not occur, and the amount of air introduced can be reduced. Therefore,
A stoker-type incinerator that reduces the amount of air introduced, raises the temperature inside the furnace, improves the incineration efficiency of the furnace, reduces unburned combustible gas, and reduces the environmental burden. Can be provided.

[Brief description of the drawings]

Is a diagram illustrating an air supply system in stoker incinerator according to the present invention; FIG.

FIG. 2 is a diagram schematically showing a cross section of a side surface of the stoker type incinerator according to the present invention.

3 is a diagram illustrating another example embodiment of a stoker incinerator according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stoker type incinerator 2 Garbage supply port 4 Drying stage 5 Combustion stage 6 Post-combustion stage 4a, 5a, 6a Wind box 50 Primary air supply piping 50a, 50b, 50c Distribution piping 51a, 51b, 51c Control valve 52, 53 Air Supply control unit

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Katsuya Akiyama 1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture Inside Kobe Steel Research Institute Kobe Research Institute (72) Inventor Masamitsu Takahashi Chuo-ku, Kobe City, Hyogo Prefecture 1-3-18, Wakihamacho Kobe Steel, Ltd.Kobe headquarters (72) Inventor Shoji Umezono 3-3-1, Wakihamacho, Chuo-ku, Kobe-shi, Hyogo Kobe Steel Ltd.Kobe headquarters (72) Inventor Hisanori Shimakura 1-3-18 Wakihama-cho, Chuo-ku, Kobe City, Hyogo Prefecture Kobe Steel, Ltd.Kobe Head Office F-term (reference) BA04 CA15 GA03 GA07 GA12 GA22 GA33 GA53

Claims (4)

[Claims] An incinerator supplied from a refuse supply port into a combustion chamber is dried and thermally decomposed while being sequentially moved over a plurality of stoker stages having a wind box in the combustion chamber. In the stoker-type incinerator for burning, at least air supplied through a wind box to the incineration material stacked near the stoker stage located near the refuse supply port and performing the drying and pyrolysis. A stoker-type incinerator comprising an air supply control unit that adjusts so as to change the supply amount of air. 2. A wind box located below at least one of the stoker steps is divided into a plurality of sections in a width direction orthogonal to a moving direction of the incineration object, and is arranged in parallel in the moving direction. The stoker type according to claim 1, wherein the air supply control unit is arranged to adjust the supply amount of the air supplied through each of the divided wind boxes so as to change. Incinerator. 3. Drying and thermal decomposition of the incineration material supplied from the refuse supply port into the combustion chamber while sequentially moving the plurality of stoker stages having a wind box below in the combustion chamber, An incineration method using a stoker-type incinerator for burning, wherein at least wind is applied to the incineration material stacked near a drying stage that is a stoker stage that is located near the waste supply port and performs the drying and thermal decomposition. incineration method according stoker incinerator, characterized by adjusting the supply amount of the air supplied through the box so as to intermittently change. 4. Drying and pyrolyzing the incineration material supplied from the refuse supply port into the combustion chamber while sequentially moving the plurality of stoker stages having a wind box below in the combustion chamber, An incineration method using a stoker-type incinerator for burning, wherein at least wind is applied to the incineration material stacked near a drying stage that is a stoker stage that is located near the waste supply port and performs the drying and thermal decomposition. incineration method according stoker incinerator, characterized by adjusting the supply amount of the air supplied through the box so as to change periodically.