JP2002022125A - Stoker furnace and method for incineration therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stoker furnace and method for incineration therewith, in which generation of unburned gas can be reduced by using oxygen or oxygen- enriched air of an improved combustibility as an oxydizer, and attain a rapid and high-temperature combustion in a main combustion chamber. SOLUTION: In the stoker furnace, a supply means 12 supplies oxygen or oxygen-enriched air to matters to be incinerated in a specified location on the grate 30 from above the grate 30. The oxygen or oxygen-enriched air is supplied from the upper part of the grate 30 to a main combustion region 7 in which the incineration matters are pyrolyzed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stoker furnace used for incineration of incinerated materials such as municipal garbage and industrial waste and a method for incineration thereof, and more particularly to a method for reducing the amount of unburned gas in a main combustion chamber. For stoker and incineration method therefor.

[0002]

2. Description of the Related Art Conventionally, a stoker furnace having a plurality of stoker stages having a wind box below has been widely used as an incinerator for incinerating objects to be incinerated such as municipal waste and industrial waste. In this stoker furnace, a drying stoker, a combustion stoker, and a post-burning stoker, which are inclined rearward, are arranged in a staircase in the front-rear direction in the lower part of the combustion chamber. The ash outlet is provided at the outlet of the fuel cell, and the secondary combustion chamber is provided above the combustion chamber.

[0003] In the stoker furnace having this configuration, the incineration material supplied from the dust supply port is sequentially dried from the dust supply port to the drying stage.
It flows on each of the stoker stages of the combustion stage and the post-combustion stage sequentially, and is dried and 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 about 50% of water is contained in municipal waste, evaporation and partial pyrolysis of this water are performed in this drying stage. Thereafter, the combustion stage ignites the refuse with the supplied primary air and burns volatiles and fixed carbon. The post-combustion stage burns unburned components (mainly fixed carbon components) that have passed without being burned until they completely become ash. Further, the combustion gas generated in the combustion chamber is mixed with the secondary air to reach the secondary combustion chamber, where it is burned.

[0004] A wind box is provided below each of the stoker stages, and outside air is introduced into the wind box using a blower or the like to cool a grate or air for burning incineration materials. The structure is such that primary air is supplied as an oxidizing agent from the grate of each stoker stage. This primary air is simultaneously introduced from a common blower into each wind box of each stoker stage.
Outside air is also supplied as oxidant to the secondary combustion chamber as secondary air in order to completely burn unburned gas that could not be burned in the main combustion chamber.

[0005] In recent years, the generation of dioxin from incinerators has become a problem, and the details of its generation mechanism have not been clarified. However, dioxin generation has also been reduced due to the decrease in unburned components of combustible gas. It is known to Therefore, aiming at complete combustion of the combustible gas by raising the temperature in the furnace and preventing the unburned portion of the combustible gas from being generated leads to reduction of dioxin. Therefore, it is known to supply oxygen or oxygen-enriched air as primary air or secondary air in order to increase the furnace temperature and reduce the amount of exhaust gas for the purpose of suppressing dioxin.

For example, according to Japanese Patent Application Laid-Open No. 3-244913, high-concentration oxygen and / or ozone is used as all or a part of the primary air and the secondary air, and the exhaust gas temperature and the amount of exhaust gas in the secondary combustion chamber are used. It is disclosed that the exhaust gas in the secondary combustion chamber is controlled to a high temperature by detecting the high-concentration oxygen and / or ozone.

[0007]

However, as in the prior art, in a stoker furnace using a grate, oxygen or oxygen-enriched air is supplied to a plurality of wind boxes as part or all of primary air and secondary air. When supplied uniformly, oxygen or oxygen-enriched air blows out from the entire surface of the grate forming the combustion chamber. As a result, it becomes difficult to reduce the air ratio, the amount of exhaust gas discharged from the entire furnace increases, the rise in the temperature of the main combustion chamber is hindered, and a large amount of unburned gas is brought into the secondary combustion chamber, and dioxin emissions are reduced. There was a problem that the suppression was not sufficient.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide oxygen or oxygen-enriched air having excellent combustibility as an oxidizing agent at a specific place on a grate. An object of the present invention is to provide a stoker furnace and an incineration method using the stoker furnace, which can reduce generation of unburned gas due to rapid and high-temperature combustion of a main combustion chamber by supplying.

[0009]

According to a first aspect of the present invention, there is provided a stoker furnace in which an incineration material is supplied from a refuse supply port, and the stoker furnace moves on a plurality of grate supplying an oxidant from below. In a stoker furnace for drying and burning the incinerated material during the supply of oxygen or oxygen-enriched air to the incinerated material at a specific location of the grate from below, above, or above and below the grate. This is provided with a supply means for performing the above.
According to the first aspect, in order to supply oxygen or oxygen-enriched air to a specific place of the grate, the temperature of the combustion area of the main combustion chamber is increased, and the generation of unburned gas reaching the secondary combustion chamber is reduced. can do.

Here, the incineration material supplied from the refuse supply port is dried, thermally decomposed, and thermally decomposed while moving on a plurality of grate supplying primary air as an oxidizing agent from below. It is incinerated through the process of burning combustible residues. Oxygen in the primary air is required in a region where pyrolysis and the burning of combustible residues after pyrolysis occur in the process of burning the incinerated material. Further, the generation of combustible gas in the pyrolysis process depends on the temperature of the material to be incinerated, and rapidly increases in a region exceeding 300 ° C. Therefore, a large amount of flammable gas is generated in a region where the incinerated material exceeds 300 ° C. If the oxygen or oxygen-enriched air can be supplied to the region, the combustion is most effectively performed, and The amount can be reduced and the furnace temperature can be increased.

[0011] The stoker furnace according to the second aspect is the first aspect of the invention.
In the, provided a detection means for monitoring the combustion state on the grate, and detecting the area where the incinerated material is thermally decomposed, the supply means is a specific grate of the grate based on the area detected by the detection means Oxygen or oxygen-enriched air is supplied to the incinerator at the place. According to the second aspect, the detecting means detects a region where the incinerated material is thermally decomposed,
By supplying oxygen or oxygen-enriched air to the region where the oxidant is most needed, the combustible gas can be effectively burned.

[0012] The stoker furnace according to the third aspect is the first aspect.
In 2 or 2, the supply means has a supply pipe for oxygen or oxygen-enriched air protruding toward a main combustion region on the grate. According to the third aspect, since the supply pipe is protruded toward the main combustion area on the grate, oxygen or oxygen-enriched air is directly supplied to the portion where the combustible gas is generated and burned. Can supply.

[0013] The stoker furnace according to the fourth aspect is the third aspect.
In the above, the supply pipe is configured so that a supply position thereof is adjustable with respect to the main combustion area. According to the fourth aspect, the supply position of oxygen or oxygen-enriched air can be adjusted according to the fluctuation of the main combustion region where the amount of combustible gas generated is largest.

According to a fifth aspect of the present invention, there is provided a stoker furnace.
In 2 or 2, the supply means includes a supply pipe for oxygen or oxygen-enriched air provided in a plurality of wind boxes provided below the plurality of grate, and a supply amount adjusting means provided in the supply pipe. It has. According to the fifth aspect, the oxygen or oxygen-enriched air from the supply pipe provided in each wind box is adjusted by the supply amount adjusting means, and the amount of the flammable gas generated in the region where the incinerated material is thermally decomposed is generated. And the oxygen-enriched air can be supplied by narrowing down to a wind box around the main combustion region where the largest amount of oxygen is present. Also, in order to attach the supply pipe of oxygen or oxygen-enriched air to the wind box provided below the grate,
There is no need to consider the durability of the supply pipe, and the supply pipe can be provided relatively easily.

According to a sixth aspect of the present invention, in the incineration method using a stoker furnace, the incineration material is supplied from a supply port, and the incineration material is dried and moved while moving over a plurality of grate supplying an oxidant from below. An incineration method using a stoker furnace for combustion, wherein oxygen or oxygen-enriched air is supplied from below, above, above or below the grate to a main combustion region in which the incineration material is thermally decomposed. According to the sixth aspect, oxygen or oxygen-enriched air is supplied from below, above, above or below the grate to the main combustion region in which the incineration is thermally decomposed, so that generation of unburned gas is reduced. In addition, the amount of exhaust gas can be reduced and the furnace temperature can be increased.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing a cross section of a side surface of a stoker furnace according to the present invention.

In FIG. 1, a stoker furnace 1 is provided with a refuse supply port 2, a pusher type refuse transporter 3, followed by a main combustion chamber 7, and a secondary combustion chamber 8 provided above the main combustion chamber 7. , To the exhaust pipe 9. The garbage supply port 2 is an open type, and the transport speed can be controlled by the garbage transport machine 3 that follows.

In the main combustion chamber 7, stoker stages 4, 5, and 6 are provided in a stepwise manner extending downward and inclining in order from the dust supply port 2. Each of the stoker 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 incineration material supplied to the section is sequentially transported to a drying stage 4, a combustion stage 5, and a post-combustion stage 6. In each of the drying stage 4, the combustion stage 5, and the post-combustion stage 6, two wind boxes 4a, 4b, 5a, 5b, 6a, 6a are arranged in series below, and primary air is supplied therefrom. It has become.

Each of the stoker stages 4, 5, and 6 is provided with a movable grate 30 and a fixed grate 30 alternately. While being supplied, the supplied incineration material can be sequentially transported backward on the drying stage 4, the combustion stage 5, and the post-combustion stage 6. The feed speed of the incinerated material by each of the stoker stages 4, 5, 6 can be arbitrarily controlled by the forward and backward moving speed of the movable grate 30. If the grate 30 becomes too hot due to combustion, a water-cooled grate 30 is used.

Above the main combustion chamber, a pair of supply pipes 12 for supplying oxygen or oxygen-enriched air project toward the main combustion area so as to sandwich the main combustion area on the grate 30 in the front-rear direction. Has been established. The supply pipe 12 constitutes supply means for supplying oxygen or oxygen-enriched air from above the grate 30. The oxygen or oxygen-enriched air ejected from the supply pipe 12 has directivity, and as shown in the drawing, the supply pipe 1 is ejected to the combustion region of the combustible gas thermally decomposed in the combustion stage 5.
2 is fixed to the furnace wall. Further, a control valve 13 that adjusts the amount of oxygen or oxygen-enriched air ejected from the supply pipe 12 according to the degree of combustion in the main combustion region is provided in the pipe leading to the supply pipe 12. The supply pipe 12 is arranged close to the main combustion area and is exposed to high temperatures. Therefore, in consideration of durability, the supply pipe 12 is made of a material such as refractory or ceramic which can withstand high temperature, or water-cooled. Or use an air-cooled metal tube.

FIG. 3 is a sectional view showing the distal end structure of the supply pipe 12 which can be cooled. 3A to 3D, in order to maintain durability even in a high temperature range, each supply pipe 12
Has a channel 17 for water or air cooling. Depending on the conditions such as the amount of unburned combustible gas generated and the temperature, the one having a straight pipe 18 corresponding to the high-speed jet (see FIG. 3A) and the one having a taper pipe 19 (FIG. 3B) (See FIG. 3 (c)) or a tube having a Laval tube 20 corresponding to supersonic or subsonic speed (see FIG. 3 (c)). Also, the tip of the tube for blowing oxygen or oxygen-enriched air is shown in FIG.
As shown in (d), more favorable effects may be obtained by providing not only the hole 18a opening at the center line but also a plurality of holes 18b opening obliquely from the side.

Returning to FIG. 1, in the secondary combustion chamber 8, secondary air is supplied from a secondary air supply pipe 14. After 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, the exhaust gas is discharged from the exhaust port 9.

Next, the incineration process of the incineration object using the stalker having the above-described structure will be described below with reference to FIG. The incinerated material such as municipal refuse supplied through the refuse supply port 2 onto the drying stage 4 is dried by the primary air supplied from the wind boxes 4a and 4b. Next, the incineration material pushed out to the combustion stage 5 is burned by the primary air supplied from the wind boxes 5a and 5b. In the combustion stage 5, a large amount of combustible gas is generated. Therefore, the combustion stage 5 is the main combustion region in which the oxidant is most needed in the main combustion chamber.

Therefore, oxygen or oxygen-enriched air is supplied from a supply pipe 12 protruding toward the main combustion area.
As a result, the combustion of the combustible gas in the main combustion region is promoted, the temperature is raised, and the unburned portion of the combustible gas is reduced. Further, in the post-combustion stage 6, the unburned components that have passed without being burned are burned until they completely become ash. Also,
A secondary combustion chamber 8 is provided above the main combustion chamber 5, and unburned components contained in combustion gas generated by combustion in the combustion stage 5 and the post-combustion stage 6 are completely burned in the secondary combustion chamber 8.

As described above, the effect of directly blowing oxygen or oxygen-enriched air into the generation region of the combustible gas generated from the main combustion region was experimentally verified. FIG. 5 shows the influence of the oxygen concentration, the adiabatic flame temperature, and the burning speed in a premixed flame of methane (CH ₄ ), which is one of the combustible gases. Oxygen concentration 3 compared to 21% of normal air
Adiabatic flame temperature of about 20% by using 0% oxygen-enriched air
The temperature rises by 0 ° C. and the burning rate is approximately doubled. In other words, it is shown that the combustion is promoted by using the oxygen-enriched air, and the temperature inside the furnace is increased. Therefore, from the supply pipe projecting toward the main combustion area where a large amount of combustible gas is generated,
It can be seen that supplying oxygen or oxygen-enriched air directly is effective for high-temperature combustion.

Next, a stoker furnace 101 according to another embodiment will be described with reference to FIG. FIG. 2 is a diagram schematically showing a cross section of a side surface of the stoker furnace according to the present invention. The difference from FIG. 1 is that the blowing position and angle of the pipe 12 for supplying oxygen or oxygen-enriched air protruding above the main combustion chamber 7 can be freely adjusted to adjust the tip position of the supply pipe 12 freely. This is characterized in that an adjuster 15 and a detection device (detection means) 16 for monitoring the combustion state on the grate 30 and detecting a region where the incineration material is thermally decomposed are provided. Detector 16
Thereby, the tip of the supply pipe 12 automatically maintains an appropriate position with respect to the main combustion area. The other parts are the same as those in FIG. 1, and the same reference numerals are given and the description thereof is omitted.

As a detecting means for detecting a region where the incinerated material is thermally decomposed above the grate 30, an infrared camera or the like is used.
There are a method of performing image processing using a TV and a method using thermography. In the case of an infrared camera, the inside of the furnace is photographed, and the photographed image is analyzed in a controller that supplies a signal for adjusting a flow rate, thereby identifying a portion or a range of the highest temperature in the furnace. At the same time, the control valve 1 increases the concentration of oxygen-enriched air supplied from the controller to the portion or range from the supply pipe 12.
The opening degree of 3 is controlled, and the adjuster 15 is operated so that the tip of the supply pipe 12 comes to that part or range.
Thereby, the temperature distribution of the main combustion chamber is detected, and the blowing amount, the blowing position and the angle of the supply pipe 12 are adjusted so as to go to the main combustion region where oxygen or oxygen-enriched air is effectively used. Oxygen or oxygen-enriched air can be supplied intensively.

As in FIG. 1, the drying stage 4
The incineration material supplied to the front end of the
It is dried by the primary air supplied from the lower wind boxes 4a and 4b. Thereafter, in the combustion stage 5, the dried incineration material is completely burned, and in the secondary combustion chamber 8 above the main combustion chamber 7, the unburned portion contained in the combustion gas generated by the combustion in the combustion stage 5 is completely removed. After burning, the gas is discharged from the exhaust pipe 9. Here, the combustion state on the grate 30 is monitored, and the oxygen or oxygen-enriched gas projected toward the main combustion area on the grate 30 that most needs oxygen or oxygen-enriched air as the oxidizing agent is provided. The position of the air supply pipe 12 is adjustable. Therefore, combustion in the main combustion region is effectively performed at a high temperature, and the amount of exhaust gas can be reduced.

Next, a stoker furnace 102 according to another embodiment will be described with reference to FIG. FIG. 4 is a diagram schematically showing a cross section of a side surface of the stoker furnace according to the present invention. Figure 1
The different part is that there is no oxygen or oxygen-enriched air supply pipe 12 protruding toward the main combustion area on the grate 30,
A plurality of pipes 23a to 23e for supplying oxygen or oxygen-enriched air above the main combustion chamber are opened at equal intervals in the furnace wall so as to surround the main combustion area;
The point is that supply pipes 21 for oxygen or oxygen-enriched air are attached to b, 5a, 5b, 6a, 6a, respectively. The other parts are the same as those in FIG. 1, and are denoted by the same reference numerals and description thereof is omitted.

A control valve 22 is connected to the oxygen or oxygen-enriched air supply pipe 21 of the wind boxes 4a to 6a.
The control valve 22 is controlled by a controller 28. A control valve 27 is provided on a supply pipe 26 for oxygen or oxygen-enriched air reaching the pipes 23a to 23e on the furnace wall, and the supply pipe 26 is connected to a supply pipe 24 for primary air in a T-shape. The control valve 25 is connected. These control valves 25 and 27 are also controlled by the controller 28. Further, a detection device (detection means) 16 for detecting a combustion state of the main combustion chamber 7 is provided on a furnace wall located above the main combustion chamber 7 and at positions before and after the entrance of the secondary combustion chamber 8, Based on the measurement data from the detecting device 16, each of the wind boxes 4a, 4b, 5a, 5b, 6
The supply amount of oxygen or oxygen-enriched air to be introduced into a, 6a is adjusted, or the supply amount of oxygen or oxygen-enriched air mixed into primary air blown from each of the pipes 23a to 23e of the furnace wall is adjusted. The control valves 22 and 27 and the controller 28 constitute means for adjusting the supply amount of oxygen or oxygen-enriched air.

The incineration material supplied from the dust supply port 2 to the front end of the drying stage 4 is supplied to the lower wind box 4 in the drying stage 4.
It is dried by the primary air supplied from a and 4b and the primary air supplied from the pipe 23a. Since the drying stage 4 has not started combustion, the controller 28 has almost closed the control valves 22 and 27, and no oxygen or oxygen-enriched air is mixed. In the combustion stage 5, the primary air supplied from the lower wind boxes 5a and 5b and the pipe 23
The incinerated material dried by the primary air supplied from b, 23c, and 23d is gasified and burned. The detector 16 detects this combustion state, and the controller 28 opens the control valves 22 and 27, and oxygen or oxygen-enriched primary air blown out from the wind boxes 5a, 5b and the pipes 23b, 23c, 23d located in the drying stage 4. The air is mixed in such a manner that the more intense the combustion, the more the air. Thus, the unburned gas generated from the main combustion region burns at a higher temperature. In the post-combustion stage 6, the unburned components (mainly fixed carbon components) that have passed without being burned are burned until they completely become ash.
The degree of this combustion is detected by the detecting device 16, and the controller 28 opens the control valves 22 and 27, and the primary air blown out from the wind boxes 6a, 6b and the pipe 23e located in the post-drying stage 6 has an appropriate oxygen or oxygen enrichment. Mix air,
Promotes the combustion of unburned components.

As described above, the plurality of pipes 23a provided above the main combustion chamber 7 are provided so as to efficiently supply the fuel to the vicinity of the main combustion area detected by the detection device 16 provided above the grate 30. 23e and wind boxes 4a, 4b, 5
a, 5b, 6a, 6a, supply pipes 2 respectively installed in
The supply of oxygen or oxygen-enriched air from 1 is all controlled by the controller 28.

Here, a plurality of pipes 23a to 23e and wind boxes 4a, 4b, 5a, 5b,
The same effects as those of the present invention can be obtained also when only one of the supply pipes 21 installed in each of 6a and 6a is used.

The embodiments of the present invention are not limited to the above embodiments, but may be modified as follows. (1) In FIG. 1, FIG. 2 and FIG. 4, a description has been given of a stoker furnace in which the stoker steps are sequentially lowered in a stepwise manner. The apparatus and method of the present invention can be applied. (2) In FIGS. 1, 2 and 4, a stoker furnace in which a plurality of wind boxes are arranged is illustrated as a wind box of the drying stage 4, the combustion stage 5, and the post-combustion stage 6. , A stoker furnace of the type in which one wind box is arranged in 5, 6,
The apparatus and method of the present invention can be applied. Also, the apparatus and method of the present invention can be applied to a stoker furnace of a type in which the combustion stage 5 and the post-drying stage 6 are integrated. (3) In FIG. 1 and FIG. 2, the supply pipes 12 are described as being provided in a pair before and after the main combustion area. However, the supply pipes 12 may be provided before or after any of the main combustion areas. .

[0035]

As described above, according to the stoker furnace of claim 1 and the combustion method of claim 6, in order to supply oxygen or oxygen-enriched air to a specific place in the main combustion area,
The temperature in the furnace can be increased, the combustion of combustible gas in the main combustion chamber is promoted, and the amount of generated exhaust gas can be reduced. As a result, the amount of unburned gas brought into the secondary combustion chamber decreases and the temperature rises,
Dioxin generation can be effectively suppressed.

According to the stoker furnace of the second to fifth aspects, the grate 30 is specified by monitoring the combustion state on the grate and selecting the supply amount and the supply position of oxygen or oxygen-enriched air. Oxygen or oxygen-enriched air can be intensively supplied to the incinerated material at the location. Thereby, the oxygen or oxygen-enriched air which is the oxidizing agent in the region where the incinerated material is thermally decomposed is narrowed down to the most necessary place, and the oxygen or oxygen-enriched air can be supplied.
By reducing the amount of gas supplied, the temperature of the main combustion chamber can be increased, combustible gas can be burned effectively, and the amount of exhaust gas generated can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a stoker furnace embodying the present invention.

FIG. 2 is a schematic sectional view of another stoker furnace embodying the present invention.

FIG. 3 is a diagram showing a cross section of a distal end of a supply pipe used in FIGS. 1 and 2;

FIG. 4 is a schematic sectional view of still another stoker furnace embodying the present invention.

FIG. 5 is a graph showing the influence of oxygen concentration, adiabatic flame temperature, and combustion speed in a flame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stalker furnace 2 Dust supply port 4 Drying stage 4a, 4b wind box 5 Combustion stage 5a, 5b wind box 6 Post-combustion stage 6a, 6b wind box 7 Main combustion chamber 10 Secondary combustion chamber 12 Supply pipe (supply means) 15 Adjustment Instrument 16 Detection device 21 Supply pipe 22 Control valve (supply amount adjusting means) 28 Controller 30 Grate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mamoru Sugiri 1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture Inside Kobe Research Institute, Kobe Steel, Ltd. (72) Inventor Masamitsu Takahashi Chuo-ku, Kobe City, Hyogo Prefecture 1-3-18, Wakihamacho Kobe Steel, Ltd.Kobe Head Office (72) Inventor Shoji Umezono 1-3-1, Wakihamacho, Chuo-ku, Kobe, Hyogo Prefecture Kobe Steel, Ltd.Kobe Main Office (72) Inventor Hisanori Shimakura 1-3-18 Wakihama-cho, Chuo-ku, Kobe City, Hyogo Prefecture Kobe Steel, Ltd.Kobe Head Office F-term (reference) AB01 AC01 BA10 GA03 GA07 GA13 GA23 GA33 GA35 GA43

Claims (6)

[Claims] 1. A stoker furnace for drying and burning the incinerated material while the incinerated material is supplied from a trash supply port and moves on a plurality of grate supplying an oxidizing agent from below.
A stoker furnace provided with a supply means for supplying oxygen or oxygen-enriched air from below, above, above or below the grate to the incineration material at a specific location on the grate. 2. A detecting means for monitoring a combustion state on the grate and detecting an area in which the incinerated material is thermally decomposed,
The stoker furnace according to claim 1, wherein the supply unit supplies oxygen or oxygen-enriched air to the incinerator at a specific location on the grate based on a region detected by the detection unit. 3. The stoker furnace according to claim 1, wherein said supply means has a supply pipe of oxygen or oxygen-enriched air projecting toward a main combustion area on said grate. . 4. The stoker furnace according to claim 3, wherein the supply pipe is configured so that a supply position thereof is adjustable with respect to the main combustion area. 5. The supply means includes: a supply pipe for oxygen or oxygen-enriched air provided in a plurality of wind boxes provided below the plurality of grate; and a supply amount adjustment provided in the supply pipe. 3. The stoker furnace according to claim 1, further comprising means. 6. An incineration method using a stoker furnace for drying and burning the incinerated material while the incinerated material is supplied from a supply port and moves on a plurality of grate supplying an oxidant from below. And supplying oxygen or oxygen-enriched air from below, above, above or below the grate to a main combustion region in which the incinerated material is thermally decomposed.