JP2000297913A - Incinerator and incinerating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an incinerator to prevent the occurrence of black smoke environmental pollution when a substance to be incinerated is incinerated and also suppress the generation of dioxin. SOLUTION: A charge port, an intake 14, and an output port are formed in the side wall of an incinerator body 1. A grate is situated in the incinerator body 1. An exhaust cylinder 2 is situated at the upper part of the incinerator body 1 with a part of a base end part introduced in the incinerator body 1. The base end part of the exhaust cylinder 2 is closed with a bottom plate 20, and an exhaust hole 21 is formed in the side wall of a part introduced in the incinerator body 1. An air supply duct 31 on the external side and an air supply duct 32 on the internal part side are connected to a blower. A supply pipe 311 of the air duct 31 on the external part side has an air outlet 312 extending through an upper curved plate and situated in an introduced state to supply air to the inner upper side of the incinerator body 1. The tip side of the air supply duct 32 on the internal side is introduced in the incinerator body 1 and an air injection member 33 is attached to its tip.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an incinerator and an incineration method. More specifically, the present invention relates to an incinerator and an incineration method capable of preventing generation of black smoke pollution when incinerating a burnable material and suppressing generation of dioxin.

[0002]

2. Description of the Related Art In recent years, the production of tires has been increasing rapidly due to the rapid growth of automobile production. Along with that, a large amount of waste tires are generated. Some of these waste tires are used for producing recycled rubber, retreaded tires, and the like.
However, most of them are disposed of by incineration.

[0003] In addition, a large amount of industrial materials and household wastes produced by using high molecular compounds such as rubber and plastics are generated. Most of the waste products of these compacts are disposed of by incineration or the like, except that a part of them is used for landfill.

[0004]

Among the above-mentioned waste products generated from products such as rubber and plastic, the amount of waste tires is remarkably large. When such waste tires are incinerated, a large amount of oxygen is required, so that it is difficult to completely burn them, and a large amount of black smoke is generated due to incomplete combustion, thus causing so-called black smoke pollution.

[0005] In recent years, environmental issues have been widely taken up as social issues. Among them, countermeasures against highly toxic dioxins, which are liable to be generated by incineration of high molecular compounds such as waste tires, are particularly important. Is an important issue.

[0006] Regarding this problem, in a large-scale incineration facility, various measures for suppressing the generation of dioxin are being prepared. However, no countermeasures have been taken for relatively small incinerators used in public facilities such as schools and general households.

An object of the present invention is to solve the above-mentioned problems, and to prevent the occurrence of black smoke pollution when incinerating and disposing of a burnable material, and also to suppress the generation of dioxin and the incinerator. The aim is to provide a method.

[0008]

Means of the present invention taken to achieve the above object are as follows. In a first aspect, the present invention includes a furnace main body, an exhaust pipe provided at an upper part of the furnace main body, and an air supply means for forcibly sending air into the furnace main body. The furnace main body is provided with an openable and closable inlet for charging a burnable substance, and an openable and closable outlet for taking out combustion residues, and the air supply means is provided at an upper part of the furnace main body. An incinerator, characterized in that air is sent to the side to impart circumferential directionality to the combustion gas in the furnace body.

According to a second aspect of the present invention, the air supply means has an air outlet at the upper portion of the furnace main body for giving a direction in the circumferential direction. The incinerator according to the above.

In a third aspect of the present invention, the air supply means includes means for forcibly sending air in a radial direction from a central portion in the furnace body. 2 is an incinerator according to the second invention.

In the fourth aspect of the present invention, the exhaust pipe is provided such that its base end is introduced into the furnace main body by a required length and protrudes upward, and the base end of the exhaust pipe is closed. The incinerator according to the first, second or third invention, characterized in that an exhaust hole is provided in a side wall of a part of the exhaust stack introduced into the furnace body.

According to a fifth aspect of the present invention, the first and second air inlets are provided on the upper side of the furnace main body for naturally taking in external air into the furnace main body. ,
An incinerator according to the third or fourth invention.

According to a sixth aspect of the present invention, air is sent to an upper side of the furnace main body to impart a circumferential direction to the combustion gas in the furnace main body, thereby burning an object to be burned. Is a combustion method.

In the present invention, "combustion gas" is a concept indicating a gas generated when an object to be burned is burned, and includes a gas when completely burned and a gas when incompletely burned. Of the combustion gases, a gas containing carbon particles or the like, particularly when incompletely burned, may be simply referred to as “black smoke”.

The air by the air supply means may be sent from the inner wall side of the furnace main body or from the central part side of the furnace main body as long as it can give the combustion gas in the furnace main body a circumferential direction. May be. When sending air from the inner wall side of the furnace body,
At the same time as giving the combustion gas a circumferential direction, the air can also give the combustion gas a slightly downward direction. By giving the combustion gas a slightly downward direction, the rising combustion gas is convected to move downward.

An incinerator in which air is simply forcibly sent into the furnace body is disclosed in, for example, Utility Model Registration No. 3011.
It is conventionally known, such as that described in US Pat. However, in the incinerator described in the above-mentioned publication, as described in the present invention, the air sent to the upper side of the furnace body by the air supply means gives the combustion gas in the furnace body directionality in the circumferential direction. Such an idea is not disclosed.

As the material of the furnace main body or the exhaust stack constituting the incinerator, it is desirable to adopt a material having a melting point higher than the melting point of the bead wire constituting the waste tire in consideration of the incineration of the waste tire and the like. However, it is not limited to this.
As a material having such properties, a gas cylinder body manufactured for filling liquefied natural gas or the like is preferable, and a waste gas cylinder body is more preferable in consideration of manufacturing cost. Further, the material of the furnace main body is not limited to the gas cylinder body, but may be made of a firebrick, a metal having fire resistance, or the like. Further, the exhaust gas discharged from the exhaust pipe can be introduced into the cyclone device to remove dust contained in the exhaust gas.

(Operation) The operation of the incinerator according to the present invention as an object to be burned to burn waste tires will be described. The waste tire is put into the furnace body through the inlet, and ignited using a handy gas burner or the like. Most of waste tires are made of rubber, which requires a large amount of oxygen to burn, so when normal combustion starts, incomplete combustion occurs, causing black smoke containing a large amount of combustible substances such as soot. generate. In this state, the black smoke fills the furnace body and is discharged to the outside from the stack.

Then, the air supply means is operated to forcibly send air into the furnace body. Air is sent to the upper side of the furnace body to impart circumferential directionality to the combustion gases. As a result, black smoke generated by incomplete combustion is hardly discharged from the exhaust stack. The reason for this is not clear,
This is probably due to the following reasons.

The black smoke generated in the furnace body has a higher temperature in the upper part of the furnace body than in the part where the waste tire is burning. Come. Then, when air is forcibly sent to the black smoke rising to the upper side of the furnace body by the air supply means, the black smoke is heated by the high temperature of the upper side and the oxygen contained in the forcedly supplied air. Secondary combustion occurs at this position.

In the present invention, since the combustion gas is given a directionality in the circumferential direction by the air sent by the air sending means at this time, the residence time of the rising black smoke in the furnace main body can be lengthened. As a result, the black smoke is almost completely burned, and the exhaust from the exhaust stack is prevented. In addition, the black smoke and the air sent by the air sending means are stirred and mixed in the furnace body. Thereby, the combustion reaction between the black smoke and the sent air is promoted, the combustion efficiency is further improved, and the discharge of the black smoke can be more effectively prevented.

In the case where the air supply means is provided with a means for forcibly sending air in a radial direction from a central portion in the furnace main body, the combustion gas is given a direction in the circumferential direction, and black smoke is generated. Even when air is collected on the center side in the furnace body, black smoke can be diffused by blowing air in the radial direction. Thus, it is possible to prevent the black smoke from staying at the center side in the furnace main body and becoming difficult to mix with the sent air.

In the case where the base end of the exhaust stack is introduced into the furnace main body by a required length, the base end is closed, and the exhaust hole is provided in the side wall, the combustion gas is smoothly discharged from the exhaust stack. It is hard to be done. For this reason, convection easily occurs in the furnace main body, and the residence time of the combustion gas in the furnace main body is further increased. This makes it possible to more reliably suppress the generation of dioxin, which cannot be sufficiently suppressed by a high-temperature treatment in a short time.

In the case where an air inlet for naturally taking in external air into the furnace body is provided on the upper side of the furnace body, the amount of air sent by the air supply means is such that black smoke is completely burned. Even when this is not enough, air can be taken in from the air intake to bring it closer to complete combustion. This makes it difficult for the black smoke to be exhausted to the outside even in the state described above.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the embodiments shown in the drawings. 1 is a perspective view showing an embodiment of the incinerator according to the present invention, FIG. 2 is a plan view of the incinerator shown in FIG.
A part of the air supply device is omitted. FIG. 3 shows the upper side of the incinerator shown in FIG. 1, and is an explanatory view showing the internal structure with a part cut away, and FIG. 4 is an AA of the air injection member shown in FIG.
It is sectional drawing. Symbol A1 indicates an incinerator. The incinerator A <b> 1 includes a furnace body 1, an exhaust pipe 2 provided on an upper part of the furnace body 1, and an air supply device 3 as an air supply unit for forcibly sending air into the furnace body 1.

The furnace body 1 and the exhaust pipe 2 are made using a waste gas cylinder. Liquefied natural gas (50
A waste gas cylinder for 0 kg) is used. The exhaust cylinder 2 is a cylindrical body of a waste gas cylinder for liquefied natural gas (50 kg). The dimensions of incinerator A1 are
It has a total height of about 2.5 m and a diameter of about 0.9 m, but is not limited thereto. Various types of gas cylinders can be used to make incinerators of various sizes and shapes. The waste gas cylinder has a melting point higher than the melting point of a bead wire used for a tire or the like.

The furnace body 1 has a cylindrical body 10, the bottom of which is closed by a rounded lower curved plate 11. On the outer wall of the lower curved plate 11, a support member 12
Are provided at four locations at equal intervals in the circumferential direction. But,
The number and positions of the support members 12 are not limited to this.

In the upper part of the body 10, there is provided an inlet 13 for introducing an incinerated material such as a waste tire. Input port 1
3 is provided with a lid 130 whose one end side is rotatably mounted on a shaft.

At a position slightly higher than the inlet 13 in the body 10, air inlets 14 are provided at three locations at equal intervals in the circumferential direction. However, the number and positions of the air intakes 14 are not limited to this. The air intake 14 has a lid 1 that can be opened and closed by sliding along a guide 140.
41 are provided.

From the lower part of the body 10 to the lower curved plate 11, an outlet 15 for taking out the combustion residue is provided. The outlet 15 is provided with a lid 150 whose one end side is rotatably mounted on a shaft. In the furnace main body 1 corresponding to the boundary between the body 10 and the lower curved plate 11, a rostelle 16 is provided.

The upper part of the furnace body 1 is closed by a rounded upper curved plate 17 like the bottom part. Upper curved plate 1
At the outer wall portion of 7, there are provided at two places facing each other hanging metal fittings 18, 18 used for lifting and moving the furnace main body 1. The top of the upper curved plate 17 is provided with a mounting opening 19.
Is provided. The exhaust pipe 2 is attached to the mounting port 19 by introducing a part of the base side into the furnace main body 1 (see FIG. 3).

The base end of the exhaust pipe 2 is closed by a bottom plate 20. The bottom plate 20 is rounded inward. Exhaust holes 21 are provided at four locations at equal intervals in the circumferential direction on the side wall of the portion of the exhaust pipe 2 that is introduced into the furnace body 1. A removable cap member 23 is provided in the upper opening 22 of the exhaust pipe 2 to prevent rain and snow from entering the exhaust pipe 2 when it falls.

The air supply device 3 has a blower 30. The blower 30 has an outer air supply pipe 31 piped to send air from the inner wall side of the furnace main body 1, and an inner air supply pipe piped to send air from the central part side of the furnace main body 1. 32
Is connected.

The outer air supply pipe 31 has a ring pipe 310 formed in an annular shape. The ring tube 310 is provided on the upper side of the furnace main body 1 so as to surround the periphery thereof. The ring tube 310 has a blow-out tube 3 formed in a substantially “L” shape.
.. Are provided at three locations at equal intervals in the circumferential direction.
However, the number and positions of the blow-out tubes 311 are not limited to this.

Each outlet pipe 311 is connected to an outlet 312 on the tip side.
However, it is introduced so that air can be sent to the upper side inside the furnace main body 1 through the upper curved plate 17. Outlet 312
Is directed obliquely downward from the furnace main body 1 so that the supplied gas gives the combustion gas in the furnace main body 1 a direction in the right circumferential direction.

In this embodiment, the outlet pipe 311 is connected to the outlet 3
Numeral 12 is directed obliquely downward from the furnace body 1 so that air sent to the upper side of the furnace body 1 gives the combustion gas in the furnace body 1 a direction in the right circumferential direction. It can also be provided to give the combustion gas a direction in the left circumferential direction.

The inner air supply pipe 32 is connected to the side wall 25 of the exhaust pipe 2.
And the bottom part 20, the leading end side is introduced into the furnace main body 1. At the tip of the inner side air supply pipe 32, an air injection member 33 whose bottom is substantially closed and which is formed in a hollow triangular prism shape is provided. The air injection member 33 is means for forcibly sending air in a radial direction from a central portion in the furnace main body 1. The shape of the air ejection member 33 is not particularly limited as long as air can be ejected in the radial direction.

In FIG. 3, a plurality of injection holes 330... For injecting air in the radial direction are formed at the right end of each side surface of the air injection member 33 in a vertical direction. The injection holes 330 are perforated diagonally from the surface of each side in the circumferential direction in order to give the combustion gas a circumferential direction by the injected air (see FIG. 4). However, the injection holes 330 can also be provided perpendicular to the plane. Further, by attaching a curved nozzle as shown by an imaginary line in FIG. 4 to the injection holes 330, the directionality in the circumferential direction can be further enhanced.

At the bottom of the air injection member 33, injection holes 331 for injecting air downward are provided at three places (see FIG. 4). The air injected from the injection holes 331 is sent to a burning object such as a waste tire that is burning.

The external air supply pipe 31 and the internal air supply pipe 32 are provided with valves B1 and B2, respectively. Valve B1,
The amount of air sent into the furnace body 1 is adjusted by the opening and closing amount of B2.

Although not shown in the present embodiment, the incinerator A1 is equipped with a cyclone device for introducing exhaust gas discharged from the exhaust stack 2 and removing dust contained in the exhaust gas. You can also.

(Operation) The operation of the incinerator A1 shown in this embodiment will be described with reference to FIGS. Here, the case where waste tires of passenger cars are incinerated will be described, but it goes without saying that the incinerator A1 can also be used for incineration of other polymer molded bodies and various wastes.

First, waste tires are introduced through the inlet 13 with the cover 150 of the outlet 15 closed and the cover 141 of the air inlet 14 opened. Then, the waste tire is ignited using a handy gas burner or the like. The method of igniting the waste tire is not limited. Most of waste tires are made of rubber, which requires a large amount of oxygen to burn, so when normal combustion starts, incomplete combustion occurs and black smoke containing a large amount of combustible substances such as soot Generate. This black smoke fills the furnace body 1.

When or after the waste tire is ignited, the blower 30 is operated to forcibly send air into the furnace body 1 through the external air supply pipe 31 and the internal air supply pipe 32. At this time, the valves B1 and B2 provided in the external air supply pipe 31 and the internal air supply pipe 32 are opened so that an appropriate air flow rate can be secured.

The air that has passed through the outer air supply pipe 31 is sent to the ring pipe 310. The air sent to the ring tube 310 passes through the blow-off tubes 311... And is blown into the furnace main body 1 from the blow-out opening 312 so as to give the combustion gas a direction in the right circumferential direction.

The air passing through the inner air supply pipe 32 is sent to the air injection member 33, and the injection holes 330.
.. Are respectively injected. The air from the injection holes 330 is radially injected in three directions. Also, the air from the injection holes 331 is injected downward.

The air injected from the injection holes 331 is supplied to the waste tire. Thereby, it is possible to prevent the burning of the waste tire from disappearing due to lack of oxygen. Note that the air injected from the injection holes 331... Is for normal combustion (incomplete combustion) of the waste tire, and may not be necessary depending on the combustion state of the waste tire.

The temperature of the black smoke generated in the furnace body 1 is higher at the upper side of the furnace body 1 than at the portion where the waste tire is burning. And rise. Then, the air passing through the external air supply pipe 31 is blown into the blow-out pipe 31 by the black smoke rising to the upper side of the furnace body 1.
... are forcibly sent out. As a result, the black smoke causes secondary combustion at this position due to the high temperature on the upper side and the oxygen contained in the forcedly supplied air.

At this time, the outlet 312 of the blow-out pipe 311 is directed obliquely downward of the furnace main body 1, and the combustion gas in the furnace main body 1 is directed to the right circumferential direction by air sent to the upper side of the furnace main body 1. Because of this, the rising black smoke can be given a direction in the right circumferential direction, and at the same time, can be given a direction moving diagonally downward and convection. As a result, the black smoke is not immediately discharged from the exhaust holes 21..., And the residence time of the rising black smoke in the furnace main body 1 can be lengthened. Therefore, the black smoke is almost completely burned, and the exhaust from the exhaust stack 2 is prevented.

Further, since the black smoke and the air sent by the blower 30 are convected clockwise and vertically, they are stirred and mixed in the furnace main body 1 as it were. Thereby, the combustion reaction between the black smoke and the supplied air is promoted, the combustion efficiency is further improved, and the discharge of the black smoke can be more effectively prevented.

By the air sent from the outlet 312,
The combustion gas in the furnace body 1 is given a direction in the right circumferential direction, and as a result, black smoke may be collected toward the center of the furnace body 1. However, even in this case, since the air is radially injected from the injection holes 330 of the air injection member 33, the black smoke can be diffused from the center side. Accordingly, it is possible to prevent the black smoke from staying on the center side in the furnace main body 1 and becoming difficult to mix with the sent air.

Since the injection holes 330 are formed obliquely from the surface of each side surface in the circumferential direction, the air injected from the injection holes 330. Direction can be given.

The base side of the exhaust pipe 2 is partially introduced into the inside of the furnace main body 1 and attached to the furnace body 1. The base end is closed by a bottom plate 20 and the exhaust hole 21 is provided on the side wall. It is difficult to smoothly discharge from the cylinder 2. For this reason, convection easily occurs in the furnace main body 1, and the residence time of the combustion gas in the furnace main body 1 is further increased. This makes it possible to more reliably suppress the generation of dioxin, which cannot be sufficiently suppressed by a high-temperature treatment in a short time. Also, bottom plate 2
Since 0 is rounded inward, the rising black smoke will be inverted along this shape, and the furnace body 1
Within, convection is likely to occur.

Since the air inlet 14 is provided on the upper side of the furnace main body 1, even when the amount of air sent to the blower 30 is not enough to completely burn the black smoke, the air is supplied from the air inlet 14 to the blower 30. By taking in, it is possible to make the state closer to complete combustion. This makes it difficult for the black smoke to be exhausted to the outside with incomplete combustion.

In this way, the black smoke generated by the incomplete combustion is hardly discharged from the exhaust stack 2, so that the black smoke pollution can be eliminated. As described above, the reason why the black smoke is hardly discharged from the exhaust stack 2 is not necessarily clear, but is presumably due to the above-described reason. At the start of combustion, the furnace body 1
Is not warm, and the furnace body 1 is filled with black smoke.
By emitting a flame from the air inlet 14 toward the black smoke in the furnace body 1 with a handy gas burner or the like, the emission of the black smoke can be suppressed.

Since the rostrule 16 is provided in the furnace body 1 at the boundary between the body 10 and the lower curved plate 11, the ash, which is a combustion residue, and the bead wire can be separated. In addition, since the outlet 15 for removing the combustion residue is provided from the lower part of the body 10 to the lower curved plate 11, simply opening the lid 150 of the outlet 15 can simultaneously take out both the ash and the bead wire. Can be.

Since the furnace body 1 and the exhaust pipe 2 are made of waste gas cylinders, the furnace body 1 and the exhaust pipe 2 can sufficiently withstand high temperatures. Further, the incinerator A1 can be manufactured at low cost. Furthermore, waste gas cylinders that have not been used can be effectively used, which leads to resource saving.

The terms and expressions used in the present specification are merely illustrative and not restrictive, and terms and equivalents to the features described in this specification and some of them are used. There is no intention to exclude expression. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

[0059]

The present invention has the above configuration and has the following effects. (A) In the incinerator according to the present invention, air is forcibly sent by the air supply means to the combustion gas that has risen to the upper side of the furnace main body. The resulting oxygen can cause secondary combustion of the black smoke at this location. At this time, the direction of the combustion gas in the circumferential direction is given to the combustion gas by the air sent by the air supply means, so that the residence time of the rising black smoke in the furnace main body can be lengthened. As a result, the black smoke is almost completely burned, and the exhaust from the exhaust stack is prevented. In addition, the black smoke and the air sent by the air sending means are stirred and mixed in the furnace body. Thereby, the combustion reaction between the black smoke and the sent air is promoted, the combustion efficiency is further improved, and the discharge of the black smoke can be more effectively prevented. In this way, black smoke generated by incomplete combustion is hardly exhausted from the exhaust stack, so that black smoke pollution can be eliminated.

(B) When the air supply means is provided with a means for forcibly supplying air from the central portion in the furnace body in the radial direction, the combustion gas is given a directionality in the circumferential direction. Even when the black smoke is collected toward the center in the furnace body, the black smoke can be diffused by blowing air in the radial direction. Thus, it is possible to prevent the black smoke from staying at the center side in the furnace main body and becoming difficult to mix with the sent air.

(C) In the case where the base end of the exhaust stack is introduced into the furnace main body by a required length, the base end is closed, and the exhaust hole is provided in the side wall, the combustion gas flows smoothly from the exhaust stack. Is difficult to be discharged. For this reason, convection easily occurs in the furnace main body, and the residence time of the combustion gas in the furnace main body is further increased. This makes it possible to more reliably suppress the generation of dioxin, which cannot be sufficiently suppressed by a high-temperature treatment in a short time.

(D) In the case where an air inlet for naturally taking in outside air into the furnace main body is provided on the upper side of the furnace main body, the amount of air sent by the air supply means is limited to black smoke. Even when it is not sufficient for complete combustion, air can be taken in from the air intake to bring it closer to complete combustion. This makes it difficult for the black smoke to be exhausted to the outside with incomplete combustion even in the above state.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of an incinerator according to the present invention.

FIG. 2 is a plan view of the incinerator shown in FIG. 1 in a state where a lid of an outlet is closed, and a part of an air supply device is omitted.

FIG. 3 is an explanatory view showing an upper side of the incinerator shown in FIG. 1 and showing an internal structure with a part cut away.

FIG. 4 is a sectional view taken along line AA of the air ejecting member shown in FIG. 3;

[Explanation of symbols]

 A1 Incinerator B1, B2 Valve 1 Furnace body 10 Body 11 Lower curved plate 12 Support member 13 Input port 130 Cover 14 Air intake 140 Guide 141 Cover 15 Outlet 150 Cover 16 Rostor 17 Upper curved plate 18 Suspension fitting 19 Mounting port Reference Signs List 2 exhaust pipe 20 bottom plate 21 exhaust hole 22 opening 23 cap member 3 air supply device 30 blower 31 external air supply pipe 310 ring pipe 311 blowout pipe 312 blowout port 32 internal airflow pipe 33 air injection member 330 injection hole 331 injection hole

Continued on the front page F term (reference) 3K061 AA19 AB01 AC13 AC14 BA04 CA17 FA21 FA26 FA27 FA28 3K062 AA19 AB01 AC13 AC14 EA17 EB06 EB14 EB28 EB29 EB30 EB33 EB43 EB46 3K065 AA19 AB01 AC13 AC14 BA04 GA04 GA08 GA33

Claims (6)

[Claims] A furnace body (1), an exhaust pipe (2) provided at an upper part of the furnace body (1), and an air supply means for forcibly sending air into the furnace body (1). The furnace body (1) has an opening (13) that can be opened and closed for charging a substance to be burned, and an opening (15) that can be opened and closed for removing combustion residues. ,
The air supply means sends air to the upper side of the furnace body (1), and the furnace body (1)
An incinerator characterized in that the combustion gas in the interior is given a direction in the circumferential direction. 2. The air supply means according to claim 1, wherein an air outlet (312) for giving directionality in a circumferential direction is provided at an upper portion of the furnace body (1). Incinerator. 3. The incineration according to claim 1, wherein the air supply means includes means for forcibly sending air in a radial direction from a central portion in the furnace body (1). Furnace. 4. The exhaust pipe (2) is provided with its base end side introduced into the furnace body (1) by a required length and protruded upward, and a base end of the exhaust pipe (2) is provided. Closed, the exhaust stack (2)
The incinerator according to claim 1, 2 or 3, wherein an exhaust hole (21) is provided in a side wall of a portion introduced into the furnace body (1). 5. An air inlet (14) for naturally taking in external air into the furnace body (1) is provided on an upper side of the furnace body (1). , 2, 3 or 4. 6. A combustion method, characterized in that air is sent to an upper side of a furnace main body to impart a circumferential direction to combustion gas in the furnace main body to burn an object to be burned.