JPH10213381A - Heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly start or stop and to easily alter operating conditions by supplying mixed gas of fuel gas and combustion air to an annular mixed gas chamber disposed around a central axis, and forming a fuel surface of an annular burner as a direct heat transfer surface for heating, drying or burning material to be heated. SOLUTION: A cylindrical heater 1 supplies mixed gas 3 of fuel gas and the air from a mixed gas supply tube 2 to an annular mixed gas chamber 4 provided around a central axis. A cylindrical combustion surface 6 made of a fiber mat is provided at inside of the chamber 4. At the time of using, the surface is held at about 1,000 deg.C, and the chamber 4 of a rear side is cooled by the gas and held substantially at ambient temperature. When the mat 5 is installed on a furnace wall, the chamber 4 is changed to refractory material to constitute a furnace wall to provide extremely high heat insulation and extremely small thermal capacity. Thus, a temperature distribution is stabilized in a short time after ignition, enters into normal operation, and start or stop can be extremely rapidly executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, for example, calcination of lime,
The present invention also relates to a heating device for drying or burning sludge or the like, or heating a heat storage medium.

[0002]

2. Description of the Related Art Conventionally, rotary kilns are often used in facilities for burning limestone to produce quicklime, for producing cement, and for drying or burning sludge. Rotary kilns are made by refractory brick lining inside a cylindrical steel shell.They are installed at a slight inclination, and during operation, high temperature gas is blown into the interior to maintain high temperatures. While rotating the whole while supplying it from the upstream to promote heat transfer and stirring from high-temperature refractory material and furnace atmosphere gas,
This device is designed so that the processed ones come out from the downstream exit sequentially. This device is reliable and has a good track record when heating and drying the same device in large quantities and continuously. However, rotary kilns, on the other hand, require a long period of time, such as all day and night, until the refractory with a thick lining rises to a predetermined temperature after ignition is started, and requires a large amount of fuel before steady operation is started. And Further, the amount of heat retained after the operation is completed is enormous, and the amount of heat is wasted. For this reason, it is a rule that the rotary kiln is used continuously, and it is almost impossible to change the object to be heated and dried, the operating conditions, or the intermittent use. In addition, a large amount of heat leaks from the steel having a large area, and there is a drawback in terms of thermal efficiency, which is a weak point of this device.

[0003]

As described above, the rotary kiln is a convenient device for stably processing a large number of the same objects in a large amount. Otherwise, the system is extremely inefficient. However, since there are many excellent aspects of a heating and drying apparatus, a method that has a heat transfer method similar to that of the rotary kiln and that can perform intermittent operation and quick change of operating conditions has been desired.

[0004] The present invention has been made to solve such problems, and can be started and stopped quickly.
It is an object of the present invention to provide a heating device capable of easily changing operating conditions.

[0005]

A heating apparatus according to the present invention supplies an air-fuel mixture of fuel gas and combustion air to an annular air-fuel mixture chamber disposed around a central axis, and forms an inner surface of the air-fuel mixture chamber with a fiber. The combustion surface of the annular burner, which is a cylindrical combustion surface made of a mat, is a direct heat transfer surface for heating, drying, or burning an object to be heated.

In addition, the annular burner is configured to rotate around the central axis, and a mixture supply pipe for supplying the mixture to the mixture chamber is slidable and airtight movable along the outer periphery of the mixture chamber. It is arranged via a joint.

In addition, there is provided a delivery hopper for charging an object to be heated into the inside from one end of the annular burner, and a stirring / discharging mechanism for moving the object to be heated traversing along the inner surface of the annular burner. Is what it is.

In addition, a mixture of fuel gas and combustion air is supplied to an annular mixture chamber, and an inner surface of the mixture chamber is a cylindrical combustion surface made of a fiber mat, and the center axis is inclined. An air-fuel mixture supply pipe rotatable around the central axis and supplying the air-fuel mixture to the air-fuel mixture chamber is provided with an annular burner disposed via a movable joint that is slidable and airtight along the outer periphery of the air-fuel mixture chamber. And a delivery hopper into which a heated object to be heated, dried, or burned from one end is charged by a rotary stirring mechanism.

Inside the combustion surface of the annular burner, a heat-resistant annular inner cylinder capable of heating, drying or burning an object to be heated in an internal space is provided at a desired distance from the combustion surface. It is provided.

Further, a belt-like body is provided along the inner surface of the annular inner cylinder in a helical direction or in a direction parallel to the generatrix of the inner cylinder to stir the object to be heated to promote heat transfer. .

The inner cylinder is provided rotatably and extends in the axial direction. One end of the inner cylinder, which is the inlet side of the object to be heated, is supported by a roller, and the other end penetrates a wall of a receiving hopper. Then, it is supported and rotated by a roller provided on a shaft extended to the outside.

8. The heating device according to claim 5, wherein a part or all of said annular inner cylinder is made of a material having air permeability such as a perforated plate or a net.

The air-fuel mixture of the fuel gas and the combustion air is supplied to the air-fuel mixture chamber, and the upper surface of the air-fuel mixture chamber has a flat combustion surface made of a fiber mat.
A heating device having a direct heat transfer surface for heating, drying, or burning an object to be heated.

A heat-resistant plate-like material is installed at a desired distance above the combustion surface of the planar burner, and a direct transmission for heating, drying, or burning an object to be heated on the upper surface of the plate-like material. It is a hot surface.

A part or all of the plate-like material is made of a material having air permeability such as a perforated plate or a net.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a partial cross-sectional explanatory view showing a configuration of a heating device according to Embodiment 1 of the present invention, where (a) is a front view and (b) is a side view. In the figure, a cylindrical heating device 1 supplies a mixture 3 of fuel gas and air from a mixture supply pipe 2 to an annular mixture chamber 4 provided around a central axis. The mixture 3 diffuses over the entire length of the mixture chamber 4. Inside the mixture chamber 4, a cylindrical combustion surface 6 made of a fiber mat 5 is provided. The fiber mat 5 has a diameter of 10 to 50 μm × length 1
This is a fiber sintered plate having a porosity of 80 to 95% obtained by sintering a metal or ceramic fiber of 0 to 100 mm and a thickness of 2 to 5 mm. The burning surface 6 of this fiber mat 5
At the time of use, only the surface is kept at a high temperature of about 1000 ° C., while the mixture chamber 4 on the back side of the combustion surface 6 is cooled by the sequentially supplied mixture 3 and kept at almost normal temperature. The outside of the air-fuel mixture chamber 4 is an atmosphere of the atmosphere, and its temperature is almost room temperature. Therefore, when the fiber mat 5 is installed on the furnace wall, the mixture chamber 4 is replaced with a refractory material to constitute the furnace wall, and since most of the air is air, the heat insulating property is extremely high, and the heat capacity is high. Since it is extremely small and the heat capacity of the fiber mat 5 constituting the combustion surface 6 is also extremely small, the temperature distribution is stabilized in a short time (for example, several tens of seconds) after ignition, the steady operation can be started, and the start and stop are extremely quick. Can be.

The air-fuel mixture 3 diffused over the entire length of the air-fuel mixture chamber 4 passes through the fiber mat 5 and is jetted into the inner combustion chamber 7. At this time, in the vicinity of the combustion surface 6 of the fiber mat 5 facing the combustion chamber 7, the air-fuel mixture burns and changes to high-temperature combustion gas. The combustion gas 8 heats the fiber mat 5 as it passes through the combustion surface 6, whereby the combustion surface is maintained at a temperature of 700-1000 ° C and emits radiant heat proportional to its absolute temperature to the fourth power. The temperature of the combustion gas that has given heat to the combustion surface 6 drops to the combustion chamber 7. In the combustion chamber 7, radiant heat from the combustion surface 6
The heating chamber is heated to a high temperature by the sensible heat of the combustion gas, and can heat, dry, or burn the object to be heated 9 existing therein. As described above, the cylindrical surface on which the cylindrical combustion chamber 7 is formed is defined as the combustion surface 6, and the object 9 to be heated is brought into direct contact with the combustion surface 6 to conduct heat transfer. Become. Further, the heated object 9 blows out from the combustion surface 6 with which the heated object 9 is not in contact.
It is heated by convective heat transfer with a high-temperature combustion gas of about 00 to 1200 ° C. Further, the object to be heated is also dried or burned by being heated by radiant heat from a combustion surface not in direct contact.

Embodiment 2 FIG. FIG. 2 is a partial cross-sectional explanatory view showing a configuration of a heating device according to Embodiment 2 of the present invention.
In the figure, in a cylindrical heating device 1, an air-fuel mixture supply pipe 2 is connected via a movable joint 10. The heating device 1 is rotatably supported around a horizontal axis, and is rotated by a rotation mechanism (not shown). Therefore, the object to be heated 9 is heated by direct heat conduction by coming into contact with the combustion surface as in the first embodiment. Further, as in the first embodiment, the object to be heated is heated by the convection heat transfer by the high-temperature combustion gas and further by the radiant heat from the combustion surface which is not in direct contact. At this time, the object to be heated 9 rolls on the combustion surface 6 and can be efficiently heated and dried or burned.

Embodiment 3 3 and 4 are partial cross-sectional explanatory views showing the configuration of a heating device according to Embodiment 3 of the present invention. In the second embodiment, the heating device 1 is rotated around the horizontal axis.
In, the heating device 1 is supported rotatably around the tilt axis,
The rotation is performed by a rotation mechanism (not shown). In this case, the air-fuel mixture supply pipe 2 is inclinedly connected to the movable joint 10 as shown in FIG. 3, or is connected via a universal joint as shown in FIG. Therefore, the object to be heated 9
Is in contact with the combustion surface as in the first embodiment,
Heated by direct heat conduction. Further, as in the first embodiment, the object to be heated is heated by the convection heat transfer by the high-temperature combustion gas and further by the radiant heat from the combustion surface which is not in direct contact. At this time, the object to be heated 9 rolls on the combustion surface 6 and can be efficiently heated and dried or burned.

Embodiment 4 FIG. 5 is a partial cross-sectional explanatory view showing a configuration of a heating device according to Embodiment 4 of the present invention.
In the figure, reference numeral 11 denotes a stirring and discharging mechanism. The object to be heated 9 is put into the combustion chamber 7 from the delivery hopper 12 and supplied onto the cylindrical combustion surface 6 made of the fiber mat 5.
The object 9 to be heated in the combustion chamber 7 is heated and dried or burned while being stirred by the stirring and discharging mechanism 11, and is sequentially discharged. Therefore, the object to be heated 9 is heated by direct heat conduction by coming into contact with the combustion surface as in the first embodiment. Also, by high temperature combustion gas, convection heat transfer,
Further, the object to be heated is heated by radiant heat from the combustion surface that is not in direct contact, as in the first embodiment. At this time, the object to be heated 9 is stirred on the combustion surface 6 and can be efficiently heated and dried or burned.

In the above embodiment, the heating device 1 is connected to the air-fuel mixture supply pipe 2 via the movable joint 10, supported rotatably about a horizontal axis or an inclined axis, and rotated by a rotation mechanism (not shown). It is also possible to have it make it.

Embodiment 5 FIG. 6 is a partial cross-sectional explanatory view showing a configuration of a heating device according to Embodiment 5 of the present invention.
In the figure, a heating device 1 is adapted to rotate around an inclined central axis. The heating device 1 is supported by rollers 13 and is rotated by a motor 14.
Reference numeral 15 denotes a gas holder slidably connected to the outer periphery of one end of the heating device 1 for collecting gas generated from the object 9 to be heated. Reference numeral 16 denotes a receiving hopper slidably connected to the outer periphery of the other end of the heating device 1 for receiving a dried object to be heated or a combustion residue 18. The object to be heated 9 is rotated by a rotary transport mechanism 17 provided in the delivery hopper 12.
Charged into the combustion chamber 7. Since the rotating shaft of the drying apparatus 1 configured as described above is inclined, the supplied heated object 9 gradually moves downward while being sequentially stirred. The object to be heated or the combustion residue 18 after the heating and drying or the burning are sequentially discharged from the lower outlet of the receiving hopper 16. Also in the present embodiment, the object to be heated 9 is heated by direct heat conduction by coming into contact with the combustion surface as in the first embodiment. Further, the high-temperature combustion gas gives heat to the object to be heated by convective heat transfer and is discharged. Further, the object to be heated is heated by radiant heat from the combustion surface that is not in direct contact, as in the first embodiment. At this time, the object to be heated 9 rolls on the inclined combustion surface 6, so that it can be efficiently heated and dried or burned.

Embodiment 6 FIG. FIG. 7 is an explanatory sectional view showing a configuration of a heating device according to Embodiment 6 of the present invention. In the figure, reference numeral 19 denotes an inner cylinder having heat resistance, which is a fiber mat 5 of the heating device 1 which rotates around the inclined axis.
Inside the combustion chamber 7 at an appropriate distance from the combustion surface 6,
It is provided in parallel with this. The inner cylinder 19 is heated by radiant heat radiated from the combustion surface 6 of the fiber mat 5 and high-temperature combustion gas blown out from the combustion surface 6 at about 800 to 1200 ° C., and is maintained at 700 to 1000 ° C. . Since the inner cylinder 19 can be formed as thin as the strength allows, the heat capacity is small, and the outer surface to be heated and the inner surface facing the object to be heated 9 have almost the same temperature. The object to be heated 9 is heated from the inner cylinder maintained at a high temperature by direct heat conduction and radiant heat. The inner cylinder 19 is configured to rotate around an axis integrally with the heating device 1, and the heated object to be heated or the combustion residue 18 gradually moves downward while being stirred, and is sequentially discharged from the discharge port 16. Is done.
In the present embodiment, the object to be heated 9 is heated by heat conduction by coming into contact with the inner cylinder 19. The high-temperature combustion gas is blocked by the gas blocking wall 20, flows out of the gas outlet 21, is guided into the inner cylinder, gives heat to the object 9 by convective heat transfer, and discharges the gas through the gas holder 15. It is supposed to. Further, the object to be heated 9 is efficiently heated by radiant heat from the inner cylindrical surface that is not in direct contact, and can be dried or burned.

Embodiment 7 FIG. FIG. 8 is an explanatory sectional view showing a configuration of a heating device according to Embodiment 7 of the present invention. In the present embodiment, the spiral stirring plate 22 having a desired width continuously spiraling along the inner peripheral surface of the inner cylinder 19, or continuous in a state parallel to the generating line along the inner peripheral surface of the inner cylinder 19. A band-like stirring plate 23 having a desired width is provided to stir the object 9 to be heated to promote heat transfer. The spiral stirring plate member 22 or the band-like stirring plate member 23 promotes stirring of the heated object 9 put in the inner cylinder 19. The heated object or the combustion residue 18 supplied and heated in the inner cylinder 19 is sequentially sent downward while being stirred, sent to the receiving hopper 16 and discharged. As a result, the object to be heated 9 is efficiently heated and can be dried or burned. In addition,
In FIG. 8, the spiral stirring plate 22 and the band-like stirring plate 23 are shown together.

Embodiment 8 FIG. FIG. 9 is an explanatory cross-sectional view illustrating a configuration of a heating device according to Embodiment 8 of the present invention. In the present embodiment, the inner cylinder 19 is rotatably provided and extends in the axial direction. One end, which is the inlet side of the object 9 to be heated, is supported by the roller 13 at the end of the inner cylinder 19, and the other end is provided. Is supported by a roller 13 provided on a shaft extending through the wall of the receiving hopper 16 and extending to the outside.
4 to rotate. The heating device 1
Is connected to the gas holder 15 without rotating so as to receive the heated object 9 supplied from the delivery hopper 12. The combustion gas 8 is blocked by a gas blocking wall 20,
The gas flows out from the gas outlet 21, is guided into the inner tube 19 through the opening 24 of the inner tube 19, and is discharged through the gas holder 15.

The object 9 to be heated is put into the inner cylinder 19 by the rotary transfer device 17 provided in the delivery hopper 12. A spiral stirring plate 22 or a band-like stirring plate 23 is provided inside the inner cylinder 19 as in the sixth embodiment. The article 9 to be heated placed in the inner cylinder 19 is heated, dried or burned, and is simultaneously sent downward. The heated material or the combustion residue 18 is transferred to the inner cylinder 19.
Is sent out to the receiving hopper 16 from the opening 24 provided in the receiving hopper 16. As a result, the object to be heated 9 is efficiently heated and can be dried or burned. In the present embodiment,
Since a mechanism for rotating only the inner cylinder 19 is employed, a rotary sliding device for preventing the mixture 3 supplied from the mixture supply pipe 2 from leaking is unnecessary, which is reasonable.

Embodiment 9 The inner cylinder 19 in the sixth to eighth embodiments can be partially or entirely made of a material having air permeability. As a result, the combustion gas 8 discharged from the annular burner passes through the inner cylinder 19 and flows into the inner cylinder 19, so that the object to be heated can be efficiently heated in the process.

Embodiment 10 FIG. FIG. 10 shows a tenth embodiment.
FIG. 3 is an explanatory cross-sectional view illustrating a configuration of a heating device according to the first embodiment. In Embodiment 10, the upper surface of the air-fuel mixture chamber 4 is a flat combustion surface 6 made of a fiber mat 5, and a furnace wall 25 made of a heat insulating material is installed at a desired distance from the combustion surface.
The inside of the combustion chamber 7 is kept at a high temperature. The heated object 9 supplied onto the combustion surface 6 from the delivery hopper 12 is
The heat is efficiently heated by the direct heat transfer from the combustion surface, the convective heat transfer from the high-temperature combustion gas inside the combustion chamber 7, and the radiant heat from the furnace wall 25. The heated, dried, or burned object 9 is discharged from a combustion chamber outlet 26. The heated combustion gas flows out of the gas outlet 21.

In the tenth embodiment, since the burner 1 and the furnace wall 25 are inclined by an appropriate angle, the heated objects 9 which have been heated are sequentially discharged downstream, but the entire apparatus is inclined. In this case, the same thing as that of the stirring and discharging mechanism 11 in the fifth embodiment may be provided and discharged. In this case, the thickness of the object 9 to be heated on the combustion surface 6 is adjusted. Can be easily done. It is clear that the furnace wall 25 does not necessarily have to be provided.

Embodiment 11 FIG. FIG. 11 shows an eleventh embodiment.
FIG. 3 is an explanatory cross-sectional view illustrating a configuration of a heating device according to the first embodiment. In the eleventh embodiment, a heating plate 27 made of a heat-resistant plate material is installed at a desired distance from the flat combustion surface 6 made of the fiber mat 5, and the heating plate 27 is placed on the heating plate 27 from the hopper 12. The object to be heated 9 is supplied. The combustion gas 8 flows downstream after being blocked by the gas blocking wall 20, flows out of the gas outlet 21, enters the heating chamber 7, and flows out of the gas holder 15. Heating plate 27 is maintained at a high temperature by heat transfer mainly including radiant heat from combustion surface 6 and convection from combustion gas. The object 9 is heated by direct heat transfer from the heating plate 27 and convective heat transfer from the combustion gas. The heated object 18 after the heating is discharged into the receiving hopper 16.

In the eleventh embodiment, the heating plate 27
May be made permeable, and the combustion gas 8 may pass through the heating plate 8 and enter the heating chamber 7. As a result, the object to be heated can be efficiently heated. Further, the stirring and discharging mechanism 11 may be provided and discharged in the same manner as in the eleventh embodiment. In this case, it is also easy to adjust the insertion thickness of the article 9 to be heated onto the combustion surface 6. it can.

[0032]

As described above, according to the present invention, the heat capacity of the entire apparatus becomes extremely small as compared with the conventional apparatuses,
The temperature distribution is stable in a short time, and it can start steady operation.
It can be started and stopped quickly, the operating conditions can be easily changed, the heating efficiency is remarkably excellent, and the running cost can be greatly reduced. Further, since the object to be heated is rotated about a horizontal axis, the object to be heated rolls on the combustion surface, and can be efficiently heated and dried or burned.
Further, since the objects to be heated are sequentially discharged while being stirred by the stirring and discharging mechanism, they can be efficiently heated and dried or burned. Further, since the object to be heated rolls on the inclined combustion surface, it can be efficiently heated and dried or burned. Further, since the inner cylinder is provided, the object to be heated is efficiently heated by the radiant heat from the inner cylinder surface which is not in direct contact with the inner cylinder, and can be dried or burned. In addition, since the spiral stirring plate or the band-like stirring plate is provided in the inner cylinder, the objects to be heated placed in the inner cylinder are sequentially sent out while being stirred, efficiently heated, and dried or burned. Can be.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional explanatory view showing a configuration of a heating device according to Embodiment 1 of the present invention.

FIG. 2 is a partial cross-sectional explanatory view showing a configuration of a heating device according to Embodiment 2 of the present invention.

FIG. 3 is a partial cross-sectional explanatory view showing a configuration of a heating device according to Embodiment 3 of the present invention.

FIG. 4 is a partial cross-sectional explanatory view showing another embodiment of the configuration of the heating device according to Embodiment 3 of the present invention.

FIG. 5 is a partial sectional explanatory view showing a configuration of a heating device according to a fourth embodiment of the present invention.

FIG. 6 is an explanatory sectional view showing a configuration of a heating device according to a fifth embodiment of the present invention.

FIG. 7 is an explanatory sectional view showing a configuration of a heating device according to a sixth embodiment of the present invention.

FIG. 8 is an explanatory sectional view showing a configuration of a heating device according to a seventh embodiment of the present invention.

FIG. 9 is an explanatory sectional view showing a configuration of a heating device according to Embodiment 8 of the present invention.

FIG. 10 is an explanatory sectional view showing a configuration of a heating device according to Embodiment 10 of the present invention.

FIG. 11 is an explanatory sectional view showing a configuration of a heating device according to Embodiment 11 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating apparatus 2 Mixture supply pipe 3 Mixture 4 Mixture chamber 5 Fiber mat 6 Combustion surface 7 Combustion chamber 8 Combustion gas 9 Heated object 10 Movable joint 11 Stir discharge mechanism 12 Delivery hopper 13 Roller 14 Motor 15 Gas holder 16 Receiving hopper 17 Rotating / conveying mechanism 18 Heated object or combustion residue 19 Inner cylinder 20 Gas blocking wall 21 Gas outlet 22 Spiral stirring plate 23 Band stirring plate 24 Inner cylinder opening 25 Furnace wall 26 Combustion chamber outlet 27 Heating plate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Takeuchi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Within Nihon Kokan Co., Ltd. (72) Inventor Kozo Asano 3 Bentencho, Tsurumi-ku, Yokohama-shi, Kanagawa (72) Inventor Hideyo Tatsuta N3, Bentencho, Tsurumi-ku, Yokohama, Kanagawa Prefecture N72K Inventor Kenzo Imagawa 3, Bentencho, Tsurumi-ku, Yokohama, Kanagawa N3 Inside (72) Inventor Hirokazu Nomura 88, Onocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside Japan Steel Pipe Works Co., Ltd. (72) Inventor Shinpeng Nakanishi 88, Ono-cho, Tsurumi-ku, Yokohama, Japan The inner

Claims (11)

[Claims] An air-fuel mixture of fuel gas and combustion air is supplied to an annular air-fuel mixture chamber disposed around a central axis, and an inner surface of the air-fuel mixture chamber is formed into a cylindrical combustion surface made of a fiber mat. A heating device, wherein a combustion surface of a burner is a direct heat transfer surface for heating, drying, or burning an object to be heated. 2. An air-fuel mixture supply pipe for supplying an air-fuel mixture to the air-fuel mixture chamber, the air-fuel mixture supply pipe slidably and hermetically movable along the outer periphery of the air-fuel mixture chamber. The heating device according to claim 1, wherein the heating device is provided via a joint. 3. A delivery hopper for charging an object to be heated into the inside from one end of the annular burner or a stirring / discharging mechanism for moving the object to be heated traversing along the inner surface of the annular burner. The heating device according to claim 1, wherein the heating device is provided. 4. An air-fuel mixture of fuel gas and combustion air is supplied to an annular air-fuel mixture chamber, and an inner surface of the air-fuel mixture chamber is a cylindrical combustion surface made of a fiber mat, with a central axis inclined. An air-fuel mixture supply pipe rotatable around the central axis and supplying the air-fuel mixture to the air-fuel mixture chamber is provided with an annular burner disposed via a movable joint that is slidable and airtight along the outer periphery of the air-fuel mixture chamber. And a delivery hopper for charging an object to be heated, dried or burned from one end into the interior by a rotary stirring mechanism. 5. An annular inner cylinder having a heat resistance capable of heating, drying or burning an object to be heated in an internal space inside a combustion surface of the annular burner at a desired distance from the combustion surface. The heating device according to claim 4, wherein the heating device is provided at a distance. 6. A belt-like body is provided along the inner surface of the annular inner cylinder in a spiral direction or in a direction parallel to the generatrix of the inner cylinder, and heat transfer is promoted by stirring the object to be heated. The heating device according to claim 5, wherein 7. The inner cylinder is rotatably provided and extends in the axial direction. One end of the inner cylinder, which is the inlet side of the object to be heated, is supported by a roller, and the other end penetrates a wall of a receiving hopper. 7. The heating device according to claim 5, wherein the heating device is rotated by being supported by a roller provided on a shaft extended to the outside. 8. The heating device according to claim 5, wherein a part or all of the annular inner cylinder is made of a material having air permeability such as a perforated plate or a net. 9. An air-fuel mixture of fuel gas and combustion air is supplied to the air-fuel mixture chamber, and the upper surface of the air-fuel mixture chamber has a flat combustion surface made of a fiber mat. A heating device comprising a direct heat transfer surface for heating, drying or burning a heated object. 10. A heat-resistant plate-like material is placed at a desired distance above the combustion surface of the planar burner, and the object to be heated is heated, dried or burned on the upper surface of the plate-like material. The heating device according to claim 9, wherein the heating device is a direct heat transfer surface. 11. The heating device according to claim 10, wherein a part or all of the plate-like material is made of a material having air permeability such as a perforated plate or a net.