JP5555321B2 - Continuous combustion equipment for solid fuel containing incombustibles - Google Patents

Description

The present invention relates to a combustion apparatus capable of continuously incinerating solid fuel containing incombustible material such as sewage sludge dried to a moisture content capable of self-combustion .

  Conventionally, as a combustion device for solid fuel such as wood chips, an inner cylinder is provided in a cylindrical furnace body, solid fuel is continuously supplied from below the furnace body by a screw conveyor, and combustion air is moved down the outer periphery of the inner cylinder. There is a combustion device that is supplied as a swirling flow toward the vehicle and continuously burns at a high temperature (see, for example, Patent Document 1).

  In this combustion apparatus, solid fuel is continuously transferred by a continuous feeder (screw conveyor) onto a holding portion (grate) provided in a primary combustion chamber, and swirling combustion air from above and the continuous feeder Combustion air blown upward from the surroundings is supplied and burned, and the combustion gas rises in the center of the inner cylinder and leads to the secondary combustion chamber, where further swirling combustion air is supplied and burned at a high temperature. I am doing so.

JP2009-162414

The combustion furnace of Patent Literature 1 supplies swirling combustion air and burns the combustion gas burned in the primary combustion chamber at a higher temperature in the secondary combustion chamber, so that it can be completely burned and is solid. It is an economical incinerator that can incinerate fuel continuously.
However, solid fuel such as dried organic sludge generally contains a considerable amount of non-combustible material, and there is a considerable amount of non-flammable material that accumulates on the grate and on the combustion chamber wall along with the combustion gas. . And this often forms a clinker and combustion is inhibited.

In the combustion furnace of Patent Document 1, a maintenance opening is provided at the lower portion of the primary combustion chamber for manually taking out non-combustible materials and ash accumulated therein, but ash cannot be taken out during combustion. . For this reason, when combustion is inhibited by the generation of clinker, the supply of fuel and the supply of combustion air must be stopped to stop the combustion and wait for the furnace body to cool down.
Therefore, in this incinerator, it is necessary to incinerate completely using solid fuel that does not contain incombustible materials, and to periodically stop the furnace to remove ash and clinker accumulated in the furnace body. The

Accordingly, an object of the present invention is to provide an economical combustion apparatus that can be continuously operated for a long period of time without generating a clinker even with a solid fuel containing an incombustible material .

In order to achieve the above object, the solid fuel continuous combustion apparatus containing incombustible material of the present invention employs the following means. That is, a cylindrical inner wall concentric with the outer wall is provided at the upper part of the furnace body having a vertical cylindrical outer wall, and a screw conveyor for sequentially transferring solid fuel directly above the inner wall is provided. In a continuous combustion apparatus for solid fuel containing incombustibles for burning combustion air swirling spirally from above the outer periphery of the wall into the solid fuel at the upper end of the screw conveyor,
In the upper part of the screw conveyor, the upper end of the transferred solid fuel is formed in a conical shape with a high central part, so that the central part is fastened to the tip of the rotating shaft of the screw conveyor so that the peripheral side is transferred slowly. In order to supply combustion air also from the inside of the solid fuel, a guide member comprising a cylindrical or conical middle member provided and a concentric conical cylindrical outer member fixed on the outer periphery thereof is provided. The rotating shaft is hollow and a large number of injection holes are provided at the upper end thereof, and a cavity is provided in the circumference of the upper end edge of the casing cylinder, a plurality of injection holes are provided on the inner peripheral surface and the upper surface, and no grate is provided. An ash storage section for burning the solid fuel at the upper end transferred by the screw conveyor and storing the incinerated ash that has fallen without rising with the combustion gas is provided below.

Solid fuel containing non-combustible materials refers to sewage sludge, chicken dung and livestock dung, organic sludge such as food processing sludge dried to a self-combustible water content, sludge in paper mills, mushroom medium, etc. Granules, pellets, and chips are desirable, but powders are also acceptable.

The continuous combustion apparatus of the present invention is characterized by not providing a grate. Solid fuel is transferred to the top by a standing screw conveyor and its upper end is formed in a conical shape (mountain), and combustion air is swirled between the outer wall and the inner wall from above to be supplied to the upper end of the solid fuel. Burn from the surface. The combustion gas rises to the inside of the inner wall, and incinerated ash (including unburned and semi-burned) that does not float with the combustion gas is pushed by the solid fuel that is sequentially transferred and dropped to the lower ash reservoir. ing.

In a combustion apparatus that continuously burns, the continuously supplied solid fuel sequentially burns in the order in which it is transferred, and it is necessary to quickly remove ash and unburned solid matter from the combustion section.
In this combustion device, solid fuel is transferred directly above by a screw conveyor, the upper end is formed in a conical shape, and not only the top but also the surface below the middle is burned, and the incinerated ash and unburned solids are inclined. It is dropped and removed quickly.
The conical formation can be formed, for example, by transferring the solid fuel directly from the central portion and overflowing to the periphery at the upper end, but in this case, the solid fuel is sequentially sent to the burning solid fuel on the surface below the middle. It will be covered with unburned solid fuel flowing down from the top.
In this apparatus, a conical shape is formed by providing guide means for transferring the solid fuel on a vertical screw conveyor so that the central portion is fast and the peripheral side is slow.

The guide means is a guide member composed of a cylindrical or conical middle member fixed to the tip of the rotating shaft of the screw conveyor and a concentric conical cylindrical outer member fixed to the outer periphery thereof. The conical inclination angle can be made as desired by changing the combination of the outer diameter of the intermediate member and the outer diameter of the outer member.

Further, the guide means is provided with an inner cylinder having a smaller diameter than the casing cylinder on the upper end side of the screw conveyor, and a connecting shaft provided with a screw blade fitted to the inner cylinder on the upper end of the rotating shaft of the screw conveyor is fixed ( (Claim 2 ).
In addition, a connecting shaft in which the upper end side of the screw conveyor is made one step larger in diameter and a rotating cylinder having the same or slightly larger diameter as that of the casing cylinder is connected to the upper end portion of the rotating shaft of the screw conveyor is connected to the enlarged portion. or as a solid fuel is provided an auxiliary feed hopper for supplying (claim 3) of the.

  The screw conveyor for transferring the solid fuel directly above may have a single screw blade, but it is desirable that the screw conveyor be multi-threaded when the diameter of the screw blade is large.

Combustion air swirling from above is fed into the solid fuel formed in a conical shape, but in order to promote combustion, the combustion air is also supplied from the inside of the solid fuel.
The combustion device is a negative pressure combustion system. In this means, it is convenient to provide a suction fan capable of adjusting the pressure on the exhaust side of the combustion gas.

The means for supplying combustion air from the inside of the solid fuel, a large number of ejection holes provided in the upper end portion of the rotary shaft of the screw conveyor as a hollow, with supplying combustion air from below the upper edge of the casing tube of the screw conveyor A cavity is provided in the circumference of the nozzle, and a plurality of ejection holes are provided in the inner peripheral surface and the upper surface thereof.
Further, when the diameter of the screw blade is large, a branched air supply material having a large number of ejection holes may be provided at the upper end portion of the rotating shaft of the screw conveyor.

  The conical solid fuel can be almost completely incinerated at high temperatures (over 800 degrees Celsius) by adjusting the feed speed of the screw conveyor and the supply amount of combustion air as appropriate. It falls to the ash storage part along the slope by the solid fuel sent sequentially.

  The application of this continuous combustion apparatus is not particularly limited, but when used as a boiler, a heat exchanger in which a water pipe is disposed along the inner wall of a cylindrical body concentric with the outer wall may be provided directly above.

As described above, the continuous combustion apparatus for solid fuel containing incombustible material according to the present invention is a cylindrical or conical middle member fixed at the tip of the rotary shaft of the screw conveyor so that the center portion is fast and the peripheral side is transported slowly. And a conical cylindrical outer member fixed on the outer periphery thereof, and a conical cylindrical upper wall that is concentric with the outer wall so that the upper end of the transferred solid fuel is formed in a conical shape. In order to feed the combustion air swirling above the screw conveyor and to supply the combustion air also from the inside of the solid fuel, the screw conveyor has a hollow rotation shaft and a large number of ejection holes at its upper end, A cavity is provided in the circumference of the upper edge of the casing cylinder, a plurality of injection holes are provided on the inner peripheral surface and the upper surface thereof, the solid fuel at the upper end transferred by the screw conveyor is burned without a grate, Burned Is provided with the ash reservoirs that store ash dropped without floating with gas, the entire conical surface is substantially simultaneously burn easily ash not flying with combustion gas falls smoothly.

  In addition, since the burning solid fuel is sequentially mixed from the surface without being mixed with the new solid fuel to be transferred, the combustion area is wide and the complete burning is smoothly performed. In addition, ash shells and incombustibles do not accumulate in the combustion part, and therefore, it is difficult to form a clinker, and even if it is made, it falls from the combustion part and is eliminated. Therefore, even if it is a solid fuel containing a lot of incombustibles, continuous operation is not hindered. Further, since no mechanical means for removing incinerated ash and incombustibles in the combustion section is required, the apparatus is simple and there is no fear of failure.

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Further, as a guide means, an auxiliary conveyor in which a small-diameter inner cylinder is provided on the upper end side of the screw conveyor and a connecting shaft having screw blades attached to the inner cylinder is fixed to the upper end of the rotating shaft ( invoice) If it is the item 2 ), the transfer of the central part is performed more reliably, and the combustion part can be formed in a conical shape.

In addition, a connecting shaft in which the upper end side of the screw conveyor is made one step larger in diameter and a rotating cylinder having the same or slightly larger diameter as that of the casing cylinder is connected to the upper end portion of the rotating shaft of the screw conveyor is connected to the enlarged portion. If an auxiliary supply means for supplying solid fuel is provided ( Claim 3 ), when changing the type of solid fuel or changing the supply speed, adjustment for forming a conical shape is easy. it can.

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It is a front view which shows embodiment of the continuous combustion apparatus of the solid fuel of this invention. It is a section perspective view showing the details near the upper end of a screw conveyor. It is explanatory drawing which shows embodiment at the time of providing a heat exchanger integrally. It is a front view which shows another embodiment of the solid fuel guide means. It is a cross-sectional perspective view which shows another embodiment of the same solid fuel guide means. It is a front view which shows another embodiment of the solid fuel guide means. It is a front view which shows another embodiment of the solid fuel guide means. It is a perspective view of the casing cylinder 71 in FIG. It is a front view which shows another embodiment of a screw conveyor same as the above. FIG. 7 is an AA view in FIG. 6.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
FIG. 1 is a front sectional view showing a combustion apparatus as an embodiment of the present invention.
In this combustion apparatus 10, a vertical cylindrical outer wall 11 forming a furnace body is fixed on a gantry 13, and a screw conveyor 12 is provided on a support base 13 a fixed to the gantry 13 at the lower center. Yes. A cylindrical inner wall 14 concentric with the outer wall 11 is provided above the screw conveyor 12. Here, the outer diameter of the inner wall 14 is the same as the outer diameter of the screw conveyor 12.

The screw conveyor 12 includes a casing cylinder 12a and a rotating shaft 12c in which screw blades 12b are fixed in a spiral shape. The rotating shaft 12c is connected to driving means 25 that is transmitted from the outside through the central portion of the support base 13a. Yes.
The drive means 25 is connected to a drive shaft 25e from a motor 25a installed outside the gantry 13 via a sprocket 25b, a chain 25c, and a sprocket 25d, and the drive shaft 25e is connected to a rotating shaft 12c of the screw conveyor 12. Yes. In the figure, reference numeral 25f denotes a bearing.

On the upper part of the screw conveyor 12, a guide member 15 for forming the upper end portion of the transferred solid fuel in a conical shape with a high central portion is provided.
The guide member 15 includes a conical middle member 15a fixed to the tip of the rotary shaft 12c of the screw conveyor 12, and a substantially concentric conical cylindrical outer member 15b provided on the outer periphery thereof. The outer member 15b Is supported by the casing cylinder 12a by a plurality of support rods 15d.
Here, the conical angle of the outer diameter of the intermediate member 15a is the same as the conical angle of the outer diameter of the outer member 15b. Therefore, the horizontal sectional area of the lower end portion of the outer member 15b and the sectional area of the upper end portion are the same. It has become.

A fuel supply hopper 17 penetrating the outer wall 11 is fixed to the lower portion of the side surface of the casing cylinder 12a of the screw conveyor 12 so as to supply solid fuel. It is connected to.
Further, an ignition means 21 is provided on the outer wall 11 to ignite the liquid fuel by blowing it onto the upper end of the solid fuel.
Further, a gas inlet 31 through which the combustion gas flows into the heat exchanger 30 directly above is provided at the inner upper end of the middle wall 14.

  On the other hand, the supply means for the combustion air is provided with an air supply port 22 directed in the tangential direction at the upper end of the outer wall 11 so that the combustion air turns around the outer periphery of the inner wall 14. Further, a cavity communicating with the air supply port 23 is provided on the circumference of the upper end edge of the casing cylinder 12a of the screw conveyor 12, and a plurality of ejection holes are provided on the inner peripheral surface and the upper surface (see FIG. 2). Further, the rotary shaft 12c and the drive shaft 25e of the screw conveyor are formed hollow and are provided with an air supply port 24 at the lower end, and the middle member 15a is also provided with a cavity and provided with a number of ejection holes. The outer member 15b has a cavity and a large number of ejection holes, and a steel pipe for supplying combustion air from the outside is attached to the lower end portion. The air supply ports 22, 23, and 24 are communicated with a blower (not shown).

  The outer diameter of the casing cylinder 12a is substantially the same as that of the middle wall 14, and is considerably spaced from the outer wall 11. And under the screw conveyor 12, the ash storage part 16 with which the circumference | surroundings were blocked | closed is formed. Although not shown in the drawings, the ash storage unit 16 supplies combustion air so that unburned or semi-burned solid fuel dropped from the upper end of the screw conveyor 12 and an outlet for taking out the ash are completely burned. The air supply port is provided, and the air supply port communicates with the blower.

As shown in FIG. 3, a heat exchanger 30 is provided immediately above the continuous combustion apparatus 10.
In the heat exchanger 30, a water pipe 32 is spirally arranged on the inner wall of the cylindrical body 30 a concentric with the outer wall 11 of the continuous combustion apparatus 10. The central portion of the lower end communicates with the continuous combustion apparatus 10 and is provided with a gas inlet 31 through which combustion gas flows, and a combustion gas pipe 18 connected to the ash recovery tower 40 is attached to the lower side of the furnace body 30a. Has been.
The ash recovery tower 40 is an inverted conical cyclone 41 having an ash receiver 42 in the lower part, and an exhaust cylinder 43 is provided in the upper part.

Next, the operation of the continuous combustion apparatus configured as described above will be described.
First, while driving the belt conveyor which conveys solid fuel to the fuel supply hopper 17, the motor 25a of the drive means 25 is driven. Then, a blower (not shown) is driven to supply combustion air to the air supply ports 22, 23, and 24 and the air supply port provided in the ash storage unit 16.
When the motor 25a is driven, the rotary shaft 12c of the screw conveyor 12 is rotated via the chain 25c and the drive shaft 25e.
Thereby, the solid fuel stored in the fuel supply hopper 17 is sequentially transferred upward from the lower portion of the screw conveyor 12 by the screw blades 12b.

The amount of the solid fuel transferred to the upper end of the screw conveyor 12 is changed by the guide member 15 at the central portion and the end portion, and the central portion is sent faster, and the solid fuel is transferred at the upper end of the casing cylinder 12a. It is formed in a conical shape.
Here, the conical angles of the outer diameters of the intermediate member 15a and the outer member 15b are the same, the solid fuel in the outer member 15b has a horizontal cross-sectional area that does not change in the height direction, and the guide member 15 transfers the solid fuel. It has been reduced to become resistance in doing.

  When the solid fuel becomes conical, the ignition means 21 is operated to ignite the solid fuel. Note that this operation is only activated at the beginning of burning the solid fuel. When the amount of heat in the boiler used is insufficient, another fuel with a large amount of heat is mixed and supplied.

  On the other hand, by the supply of combustion air, the outer periphery of the inner wall 14 is swung down from the air supply port 22 and blown from above the solid fuel, and from the air supply port 24 inside the drive shaft 25e and the rotary shaft 12c. Combustion air is blown upward from the lower side of the solid fuel through the ejection holes of the intermediate member 15a and the outer member 15b. Further, combustion air blows from the air supply port 23 to the solid fuel through the ejection hole 23a at the upper end of the casing cylinder 12a.

As a result, the solid fuel at the upper end of the screw conveyor 12 has its surface completely burned at a high temperature of 800 ° C. or more, and the incinerated ash that does not float with the combustion gas rises and is spilled by the solid fuel transferred from below. It falls to the part 16. In addition, the falling thing may contain an unburned thing, the thing in the middle of combustion, and also an incombustible thing.
Since combustion air is separately supplied to the ash storage unit 16, unburned or semi-burned food is further combusted here.

The combustion gas generated by the combustion blows up to the inside of the middle wall 14 and flows into the heat exchanger 30 from the upper gas inlet 31. Then, the water pipe 32 is heated to generate steam.
Most of the combustion gas containing incinerated ash is sent from the combustion gas pipe 18 to the ash recovery tower 40 outside the furnace. Note that the combustion gas burned in the ash storage unit 16 is also raised and sent in the same manner.
Combustion gas from the combustion gas pipe 18 is sent to the upper part of the cyclone 41 and moves downward while swirling along the wall. The ash is separated from the gas and collected in the ash receiver 42. The combustion gas from which the ash has been removed is discharged from the exhaust pipe 43.
Although not shown, a suction fan capable of adjusting the pressure is provided behind the exhaust cylinder 43 so that the inside of the combustion apparatus 10 has a negative pressure (minus 150 to 200 Pascals).

  In the above embodiment, as the guide means for transferring the solid fuel so as to form a conical shape at the upper end of the screw conveyor 12, the guide member 15 comprising the conical inner member 15a and the conical cylindrical outer member 15b is used. As described above, when the screw blade 12b of the screw conveyor 12 is large, it may not be transferred in a conical shape only by the outer member 15b.

  In this case, as shown in FIG. 4, an intermediate member 15c is provided between the intermediate member 15a and the outer member 15b. The intermediate member 15c has the same shape as the outer member 15b and a different diameter, and is configured to be supported by the outer member 15b with a support rod 15d. The intermediate member 15a, the intermediate member 15c, and the outer member 15b have cavities and are provided with a number of ejection holes through which combustion air is blown.

Next, some of the other guide means for forming the solid fuel in a conical shape will be described with reference to FIGS.
First, as shown in FIG. 5, the casing cylinder 51 of the screw conveyor 12 has an inverted conical cylinder at the upper end, and a cylindrical middle member 52 is fixed to the tip of the rotating shaft 12c, and the outer periphery thereof is substantially the same. A cylindrical outer member 53 is provided on the core. Note that the outer member 53 is supported by a support rod 54. The outer member 53 has a hollow portion, and a steel pipe for supplying air is attached to the lower end portion.
Since it is configured in this way, as the solid fuel transferred to the upper end of the screw conveyor 12 is sent to the upper end portion of the casing cylinder 51, the amount of the solid fuel that is closer to the casing cylinder 51 is different from the central portion. , Formed in a conical shape.

FIG. 6 shows an auxiliary conveyor 60 having small-diameter screw blades 62 on the upper end side of the screw conveyor 12. That is, a connecting shaft 63 having a screw blade 62 having a diameter smaller than that of the screw blade 12b is attached to the upper end of the rotating shaft 12c of the screw conveyor 12, and is fitted to an inner tube 61 attached to the casing tube 12 with a support rod 64. .
Since it is configured in this way, the solid fuel transferred to the upper end of the screw conveyor 12 is forcibly sent faster by the auxiliary conveyor 60 than the one outside the inner cylinder 61 by the auxiliary conveyor 60, A shape is formed.

Near the upper end of the connecting shaft 63, an air supply member 66 having a large number of ejection holes for blowing combustion air is fixed. As shown in FIG. 10 (a), the details of the air supply member 66 have a substantially antenna-like shape that is branched, and has a large number of ejection holes on the upper surface. The air supply material 66 supplies combustion air from a wide range inside the solid fuel.
Note that the branching shape may be appropriately determined depending on the diameter and rotation speed of the screw blades and the property of the solid fuel.

  FIG. 10B shows another embodiment of the air supply member. The air supply member 67 is substantially F-shaped with branches, and has a large number of ejection holes on the upper surface. And it is fixed in the tangential direction with respect to the connecting shaft 63 rotating in the direction of the arrow. This case is effective when the rotation resistance of the air supply member 67 is low and the rotation speed of the rotary shaft 12c is high.

FIG. 7 shows a case where the vicinity of the upper portion of the casing cylinder 71 of the screw conveyor 70 has a larger diameter, and solid fuel is also supplied thereto.
In other words, the upper end of the rotary shaft 73 of the screw conveyor 70 is connected to a connecting shaft 74 in which a rotary cylinder 75 having a diameter larger than the diameter of the screw blade 72 is supported by the support rod 74a. And the auxiliary supply means 77 of the screw conveyor system which supplies solid fuel continuously to the expansion part 71a of the upper part of the casing cylinder 71 is attached. The casing cylinder 71 of the screw conveyor 70 has a smaller diameter than the casing cylinder 12a.

A plurality of blades 76 are attached to the outer periphery of the rotating cylinder 75. The bottom surface of the enlarged portion 71a of the casing cylinder 71 is inclined. That is, as shown in FIG. 8, the inclined member 71 b is fixed so as to increase by the height h after one rotation.
Further, an air supply member 66 similar to that shown in FIG. 6 is provided near the upper end of the connecting shaft 74.

With this configuration, the solid fuel supplied from the fuel supply hopper 17 is vertically transferred by the screw conveyor 70 and ascends in the rotary cylinder 75. On the other hand, the solid fuel pushed by the auxiliary supply means 77 is filled around the rotary cylinder 75 and gradually rises while being smoothed by the blades 76 of the rotary cylinder 75.
The supply amount by the auxiliary supply means 77 is determined in relation to the transfer amount of the screw conveyor 70 so that the upper end of the solid fuel is formed in a conical shape.
In addition, since this guide means can adjust the feed amount supplied from the fuel supply hopper 17 and the auxiliary supply means 77, respectively, the supply speed of the solid fuel can be easily changed.

The screw blades 12b and 72 of the screw conveyors 12 and 70 in the above embodiment are described as having one and a half turns with respect to the rotating shaft 12c. You may use what you did. Further, only the vicinity of the lower end of the screw blade may be a multi-threaded screw blade.
FIG. 9 shows an embodiment with two screw blades.
The screw blade 12d is formed by spirally winding two blade members around the rotating shaft 12c. As a result, the supply port of the fuel supply hopper 17 to the screw conveyor 12 is first fed with solid fuel with the lower end of the screw blade 12b engaged with the lower end portion 12e. When the rotary shaft 12c rotates 180 degrees and the other lower end portion 12f of the screw blade 12d comes near the supply port, solid fuel is introduced. Therefore, the solid fuel is smoothly supplied, and the inclination according to the position of the screw blade at the upper end of the screw conveyor 12 is smoothed.

DESCRIPTION OF SYMBOLS 10 Combustion apparatus 11 Outer wall 12 Screw conveyor 12a Casing cylinder 12b Screw blade 12c Rotating shaft 12d Multiple thread screw blade 12e 1st lower end part 12f 2nd lower end part 13 Mount 13a Support stand 14 Middle wall 15 Guide member 15a Middle member 15b External material 15c Intermediate member 15d Support rod 16 Ash reservoir 17 Fuel supply hopper 18 Combustion gas pipe 21 Ignition means 22 Air supply port 23 Air supply port 23a Ejection hole 24 Air supply port 25 Drive means 25a Motor 25b Sprocket 25c Chain 25d Sprocket 25f Bearing 30 Heat Exchanger 30a Tube 31 Gas inlet 32 Water pipe 40 Ash recovery tower 41 Cyclone 42 Ash receiver 43 Exhaust tube 51 Casing tube 52 Middle member 53 External material 54 Support rod 60 Auxiliary conveyor 61 Inner tube 62 Screw blade 63 Connecting shaft 64 Support rod 65 Connecting member 66 Air supply material 67 Air supply material 70 Screw conveyor 71 Casing cylinder 71a Enlarged portion 71b Inclining member 72 Screw blade 73 Rotating shaft 74 Connecting shaft 74a Support rod 75 Rotating tube 76 Blade 77 Auxiliary supply means

Claims (4)

A cylindrical inner wall concentric with the outer wall is provided at the top of the furnace body having a vertical cylindrical outer wall, and a screw conveyor is provided below the inner wall to sequentially transfer solid fuel directly above the inner wall. In the continuous combustion apparatus for solid fuel containing incombustibles for burning combustion air swirling spirally from above the outer periphery to the solid fuel at the upper end of the screw conveyor, the solid fuel transferred to the upper part of the screw conveyor A cylindrical or conical middle member fixed to the tip of the rotating shaft of the screw conveyor so that the central portion is fast and the peripheral side is moved slowly , and its outer periphery a guide member comprising a conical tubular outer member of the core has been fixed to the provided, for also supplying the combustion air from the inside of the solid fuel, a number of injection at its upper end the rotating shaft of the screw conveyor as a hollow Provided with a hole, by providing a cavity around the circumference of the upper edge of the casing tube, of which a plurality of jet holes on the circumferential surface and a top, solid fuel at the upper end which is transported by the screw conveyor without providing the grate A continuous combustion apparatus for solid fuel containing incombustible material, characterized in that an ash storage section is provided for storing incinerated ash that has fallen without being floated together with combustion gas. In place of the above, the guide means provided in the screw conveyor is provided with an inner cylinder having a diameter smaller than that of the casing cylinder on the upper end side of the screw conveyor, and screw blades that are fitted to the inner cylinder at the upper end of the rotating shaft of the screw conveyor. The continuous combustion apparatus for solid fuel containing incombustible material according to claim 1, wherein a connecting shaft provided with a non-combustible material is fixed . Instead of the above, the guide means provided in the screw conveyor has a screw conveyor having a connecting shaft in which the upper end portion side of the screw conveyor is increased by one step and a rotating cylinder having the same or slightly larger diameter as the casing cylinder is connected by a support rod. In addition to the solid fuel supply hopper provided at the lower part of the casing cylinder, auxiliary supply means for supplying solid fuel to the enlarged portion of the screw conveyor is provided. The continuous combustion apparatus of the solid fuel containing the incombustible material of Claim 1 . The continuous combustion of the solid fuel containing incombustible material according to any one of claims 1 to 3, wherein a branched air supply material having a large number of ejection holes is provided at an upper end portion of a rotating shaft of a screw conveyor. apparatus.

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