JP3361198B2 - Circular fixed melting furnace - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular fixed type melting furnace for melting and treating incinerated ash of municipal solid waste and sewage sludge.

[0002]

2. Description of the Related Art Generally, most of the incinerated ash of municipal solid waste is landfilled. However, in recent years, it has become difficult to secure landfills year by year, and there is a demand for effective utilization and volume reduction of incinerated ash. By the way, the volume of municipal solid waste is reduced to about 1/15 to 1/20 by incineration, and the volume is reduced to about 1/3 when the incinerated ash is melt-processed into slag. Further, when the incinerated ash is melt-processed into slag, not only the volume is reduced, but also heavy metals are not eluted and it can be effectively used as an aggregate or a roadbed material. Therefore, recently, incineration ash is being melted. Further, not only incineration ash but also sludge melting treatment is being performed.

Conventionally, a surface melting furnace has been widely used as an apparatus for melting and treating incinerated ash, sewage sludge and the like (hereinafter referred to as melted matter), and a square fixed type melting furnace and a circular rotary type melting furnace are used. There is a furnace.

As shown in FIG. 8, the square fixed melting furnace has a furnace body 20 having a melted material supply path 20a and a slag discharge port 20b, a supply pusher 21 provided on a furnace bottom 20c, and a ceiling wall 20d. The burner 22 and the like are provided in the furnace, and the melted material 23 supplied into the furnace is melted from the surface by the combustion heat of the burner 22. In FIG. 8, 24 is a hopper, 25 is a cooling water tank, and 26 is a water-sealed slag conveyor.

Thus, the molten material supply path 2 from the hopper 24.
The material 23 to be melted put in
Are sequentially fed into the furnace by the above, and are deposited on the furnace bottom 20c in a state where the surface is an inclined surface. The material 23 to be melted deposited on the furnace bottom 20c is melted into a slag by its surface being melted into a film by the combustion heat of the burner 22, and flows down the inclined surface and falls into the cooling water tank 25 from the slag discharge port 20b. still,
As the molten slag flows down the inclined surface, the unmelted melted material 23 is successively exposed on the sloped surface, and the exposed melted material 23 is sequentially melted by the combustion heat of the burner 22. go. The slag that has fallen into the cooling water tank 25 is cooled and solidified into a black granular sandy substance, which is taken out by the water-sealed slag conveyor 26. Then, when the melted inclined surface recedes as the melting progresses, a new material 23 to be melted is fed into the furnace by the supply pusher 21.

Since this furnace is fixed, the furnace main body 20 is fixed, so that it is structurally very simple, there is almost no failure, and maintenance can be performed easily. There are advantages such as reliable supply of a fixed amount.

On the other hand, the circular rotary melting furnace, as shown in FIG. 9, has a slag discharge port 27b at the center of a bottom wall 27a, and has a bottomed cylindrical furnace main body 27 and a furnace main body 27 rotatably supported. Two
Ceiling wall 3 which is arranged in a movable manner up and down in 7 and forms a storage chamber 29 and a combustion chamber 30 for the melted material 28 with the furnace body 27.
1 and a burner 32 and the like provided on the ceiling wall 31, so that the mortar-shaped and annularly deposited melted substance 28 in the combustion chamber 30 is melted from the surface by the combustion heat of the burner 32. It was done. In addition, in FIG.
3 is a support roller for the furnace body 27, 34 is a rotation drive device for the furnace body 27, 35 is a lift drive device for the ceiling wall 31, 36 is a supply device for the melted material 28, 37 is a sealing mechanism, 38 is a cooling water jacket, 39 is a secondary combustion chamber, 40 is a burner for a secondary combustion chamber, 41 is a flue, and 42 is a water-sealed slag conveyor.

Thus, the material to be melted 28 supplied to one portion of the annular storage chamber 29 by the supply device 36 is transferred to the furnace body 27.
Together with the rotation, the particles are accumulated in the combustion chamber 30 in a mortar shape and in an annular shape. The material to be melted 28 deposited in the combustion chamber 30 melts into a slag by melting its surface into a film due to the combustion heat of the burner 32, and flows down the mortar-shaped surface to the secondary combustion chamber 39 from the slag discharge port 27b. After that, it falls on the water-sealed slag conveyor 42 and is discharged as a black granular sandy substance. Then, when the level of the melting surface recedes as the melting progresses, the burned material 28 is stored in the annular storage chamber 2
It is sequentially dropped from 9 and supplied to the melting surface.

In this circular rotary type melting furnace, the material to be melted 28 forms an annular layer around the combustion chamber 30 to cover the furnace wall, so that the heat loss from the furnace wall is extremely small,
In addition, there are excellent advantages such as preventing melting of refractory material on the furnace wall, which is often found in melting furnaces.

[0010]

However, there are still some problems to be solved in each of the melting furnaces. That is, in the square fixed melting furnace, since three sides of the furnace wall are brick-laid and exposed, heat loss from the furnace wall is extremely large, and
There is a problem that the molten slag contacts a part of the furnace wall and the bricks of the furnace wall are melted and damaged.

On the other hand, in the circular rotary type melting furnace, the material to be melted 28 is supplied to the melting surface by the natural collapse due to the angle of repose of the material to be melted 28 (the angle formed by the mortar-shaped inclined surface and the horizontal plane). As shown in FIG. 10, the material to be melted 28
If the surface of the layer does not melt from the solid line position to the broken line position, collapse of the melted material 28 cannot be expected, and in such a state, the furnace bottom 27a is exposed and the refractory material of the furnace bottom 27a is said to melt. There's a problem. Therefore, in order to prevent such a phenomenon, in the conventional circular rotary melting furnace, the ceiling wall 31 is moved up and down by the lifting drive device 35 so that the material to be melted 28 can be easily supplied to the melting surface. There is. However, when the ceiling wall 31 is moved up and down during operation, the fuel supply pipe and the combustion air supply pipe to the burner 32, the cooling water supply / discharge device for the furnace body 27 and the cooling water jacket 38 of the ceiling wall 31, etc. There is a problem that the structure of the melting furnace itself becomes extremely complicated because it is necessary to make it all flexible. However, since the ceiling wall 31 is driven to move up and down and the furnace body is also driven to rotate, a large number of sealing mechanisms 37 are required, which further complicates the structure. Further, since the material to be melted 28 supplied to the annular storage chamber 29 is accumulated in a compressed state, the level of the melting surface is high even though the furnace body 27 and the ceiling wall 31 are rotating and moving up and down. Even if the temperature was lowered, the material to be melted 28 was difficult to collapse or sometimes did not collapse. As a result, there is a problem that the melted material 28 cannot be uniformly and smoothly supplied to the melting surface.

The present invention has been made in view of these problems, and can prevent heat loss from the furnace wall and melting loss of the furnace wall, and can simplify the structure of the melting furnace itself. Still, it is still another object of the present invention to provide a circular fixed melting furnace that can uniformly and smoothly supply a material to be melted into a combustion chamber.

[0013]

In order to achieve the above object, the circular fixed melting furnace according to claim 1 of the present invention is installed in a fixed state, and a slag / gas discharge port is formed in the center of the bottom wall. A substantially bottomed cylindrical furnace body and a fixedly arranged upper opening of the furnace body, which forms a combustion chamber between the furnace body and an annular storage chamber between the furnace body and the peripheral wall of the furnace body. Distributing and feeding device that is disposed in a ceiling wall, a burner provided on the ceiling wall, and an annular storage chamber, and that evenly melts a material to be melted, such as incineration ash, that is supplied to one location of the storage chamber, to the storage chamber And, the molten material supplied from the storage chamber is extruded in a fixed amount to the outer peripheral edge of the bottom wall of the furnace main body toward the central side of the combustion chamber to form a mortar-shaped and annular molten material in the combustion chamber. A plurality of feed pushers that form a layer of The melt supplied is formed in a triangular pyramid shape by refractory having a slope greater than the angle of repose of the melt as sliding down the natural feeding pusher side
And a plurality of guide bodies.

The circular fixed melting furnace according to claim 2 of the present invention is the same as the circular fixed melting furnace, except that a guide member is used.
A plurality of screw feeders whose rotation speed can be freely controlled are arranged, and the melted material supplied between the supply pushers is transferred to the center of the combustion chamber by the screw feeder.

Further, the circular fixed type melting furnace according to claim 3 of the present invention is installed in a fixed state, and has a substantially bottomed cylindrical furnace body having a slag / gas discharge port formed at the center of the bottom wall, and the furnace body. A ceiling wall that is fixedly arranged in the upper opening of the furnace to form a combustion chamber with the furnace body and also forms an annular storage chamber with the peripheral wall of the furnace body, and a burner provided on the ceiling wall. And a distribution supply device that is disposed in the annular storage chamber and evenly distributes the material to be melted such as incinerated ash supplied to one location of the storage chamber to the storage chamber, and the outer peripheral edge of the bottom wall of the furnace body. Arranged at each angle, the melted material supplied from the storage chamber is quantitatively transferred to the center of the combustion chamber to form a mortar-shaped and annular layer of melted material in the combustion chamber, and the rotation speed is freely set. It comprises a plurality of controllable screw feeders.

[0016]

The molten material such as incinerated ash supplied to one portion of the annular storage chamber is uniformly distributed to the storage chamber by the distribution supply device. The material to be melted, which is uniformly distributed in the storage chamber, is pushed toward the center of the combustion chamber by the supply pusher and the screw feeder, and is accumulated in the combustion chamber in a mortar shape and in an annular shape. At this time, the material to be melted located between the supply pushers slides down toward the supply pusher side by being guided by the triangular pyramidal guide body arranged between the supply pushers, and is pushed into the center of the combustion chamber by the supply pushers. Alternatively, it is transferred to the center of the combustion chamber by a screw feeder arranged between the supply pushers. The material to be melted deposited in the combustion chamber is melted into a slag by its surface being melted into a film by the heat of combustion of the burner, and flows down the mortar-shaped inclined surface and is discharged from the slag / gas discharge port. Further, the high temperature combustion gas in the combustion chamber is also discharged from the slag / gas discharge port.
In addition, as the molten slag flows down the inclined surface, the unmelted molten material is exposed one after another on the inclined surface, and the exposed molten material is sequentially melted by the combustion heat of the burner. . Then, as the melting surface recedes as the melting progresses, each supply pusher and screw feeder push the material to be melted toward the fixed amount of the combustion chamber toward the center side, and the appropriate layer of the material to be melted according to the combustion state is always provided in the combustion chamber. To form. That is, a constant amount of the material to be melted is constantly supplied into the combustion chamber to form an ideal layer of the material to be melted, and the melting process of the material to be melted is performed smoothly and smoothly.

In this melting furnace, a layer of the material to be melted is formed in the vicinity of the peripheral wall and the bottom wall of the furnace body so that the peripheral wall and the bottom wall are not exposed, so that heat radiation from the furnace wall is reduced. As a result, less fuel is consumed and the life of the refractory material on the furnace wall is extended. In addition, because the furnace body and ceiling wall are fixed, the drive unit such as the furnace body can be omitted, and there is no need to make all the fuel supply pipes and combustion air supply pipes to the burner flexible. The structure of the furnace itself can be greatly simplified, and maintenance becomes extremely easy. Furthermore, the material to be melted is evenly distributed to the annular storage chamber by the distribution supply device, and the material to be melted supplied from the storage chamber is sent to the central side of the combustion chamber by a supply pusher or screw feeder. The substance can be uniformly and smoothly supplied into the combustion chamber, and a layer of the material to be melted can be always formed in the combustion chamber according to the combustion state. As a result, the melting process of the material to be melted can be performed efficiently.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic vertical sectional view of a circular fixed melting furnace according to an embodiment of the present invention, in which 1 is a furnace body, 2 is a ceiling wall,
3 is a burner, 4 is a distributor and feeder, 5 is a supply pusher,
6 is a guide body, 7 is a hopper, 8 is a frame, 9 is a water-cooled slag cutter, 10 is a water tank, 11 is a water-sealed flight conveyor, 12 is a water spray nozzle, and 13 is a flue.

As shown in FIG. 1, the furnace body 1 has a bottomed tubular shape, and has a peripheral wall 1a whose inner peripheral surface is covered with a refractory material such as refractory bricks, and an inner surface which is fire resistant such as refractory bricks. The bottom wall 1b is covered with objects and has a mortar-like gently sloping surface.
It consists of and. A slag / gas discharge port 1c for discharging slag and combustion gas is formed at the center of the bottom wall 1b. A cooling water jacket (not shown) is buried in the vicinity of the slag / gas discharge port 1c.
The furnace body 1 is installed and fixed in a horizontal posture on a frame 8 standing on the floor.

The ceiling wall 2 is made of a refractory material such as refractory brick, is arranged in the upper opening of the furnace body 1, and is fixedly supported by the frame 8. As a result, the furnace body 1
The combustion chamber 14 is formed between the upper end of the peripheral wall 1a of the furnace body 1 and the peripheral edge of the ceiling wall 2 between the upper end of the furnace body 1 and the ceiling wall 2. The ceiling wall 2
A cooling water jacket (not shown) is installed on the upper surface of the.

The burner 3 is provided at the center of the ceiling wall 2. In this embodiment, since the slag / gas discharge port 1c is located directly below the burner 3, a wide-angle swirl flow burner using heavy oil as fuel is used for the burner 3, and the flame spreads sufficiently to incinerate ash. It is made to flow along the surface of the material 16 to be melted. A gas burner may be used as the burner 3.

The distribution and supply device 4 is arranged above the storage chamber 15 and uniformly distributes the melted material 16 supplied from the hopper 7 to one portion of the storage chamber 15 to the storage chamber 15. . That is, as shown in FIGS. 1 and 2, the distribution and supply device 4 is disposed above the annular storage chamber 15 and rotates along the storage chamber 15 with an outer annular frame 4a and an inner annular frame 4b, and both annular. A plurality of distribution vanes 4c, which are mounted at equal intervals between the frames 4a and 4b, and have a function of uniformly distributing the melted material 16 supplied to one location of the annular storage chamber 15 to the storage chamber 15, An adjusting roller 4d arranged on the outer peripheral surface of the outer annular frame 4a, a rack 4e formed on the outer peripheral surface of the outer annular frame 4a, a pinion 4f meshing with the rack 4e, and a gear mechanism 4g for rotationally driving the pinion 4f, It consists of a motor 4h,
When the pinion 4f rotates, the respective annular frames 4a, 4b
Is rotated so that the distribution vane 4c uniformly distributes the melted material 16 supplied to one portion of the annular storage chamber 15 to the storage chamber 15.

The supply pushers 5 are arranged on the outer peripheral edge of the bottom wall 1b of the furnace body 1 at equal angles, and the storage chamber 15
The melted material 16 supplied from the unit is extruded in a fixed amount to the center side of the combustion chamber 14, and the ideal melted material 16 is always fed into the combustion chamber 14.
Is to be formed. In the present embodiment, as shown in FIGS. 1 and 3, the supply pusher 5 includes a plurality of pushers 5a which are arranged on the outer peripheral edge of the bottom wall 1b of the furnace body 1 at equal angles and are movable back and forth. It is composed of a fluid pressure cylinder 5b for moving the pusher 5a forward and backward.
In addition, a large number of pushers 5a (eight in this embodiment) having a width substantially the same as the diameter of the slag / gas discharge port 1c are used as the pushers 5a. It should be noted that the fact that a large number of pushers 5a having a width substantially the same as the diameter of the slag / gas discharge port 1c are used is known from experience that the layer of the melted material 16 can be accurately adjusted by using a large number of these pushers 5a. It is because it is being done. Then, each pusher 5a is drive-controlled so as to automatically advance and retreat in order with a fixed time.

The guide body 6 is formed of a refractory material such as refractory bricks into a triangular pyramid shape, and is arranged between the adjacent pushers 5a. Further, the inclined surface 6a of each guide body 6 has an inclination equal to or greater than the repose angle of the melted material 16 so that the melted material 16 supplied to the storage chamber 15 will naturally slide down to the supply pusher 5 side.

Next, the operation of the circular fixed melting furnace will be described. The material 16 to be melted, such as incinerated ash, which is supplied from the hopper 7 to one portion of the annular storage chamber 15, is distributed by the distribution supply device 4
Are evenly distributed to the storage chamber 15. That is, the material 16 to be melted is rotated by each of the rotatable annular frames 4 of the feeder 4.
It is uniformly distributed to the storage chamber 15 by the distribution vanes 4c provided on the a and 4b.

The melted material 1 uniformly distributed in the storage chamber 15
6 is pushed toward the center of the combustion chamber 14 by the supply pusher 5 and is deposited in the combustion chamber 14 in a mortar shape and in an annular shape. At this time, the melted material 1 located between the pushers 5a
6 is guided by the guide body 6 and slides down to the pusher 5a side, so that it is pushed into the center of the combustion chamber 14 satisfactorily and surely.

The melted substance 16 deposited in the combustion chamber 14 is
The combustion heat of the burner 3 melts its surface into a film, forming slag, which flows down the mortar-shaped inclined surface to form slag.
The gas is discharged from the gas discharge port 1c and falls into the water tank 10.
As the molten slag flows down the inclined surface, the unmelted molten material 16 is successively exposed on the inclined surface, and the exposed molten material 16 is sequentially melted by the combustion heat of the burner 3. Go away. Also, when the slag flows down from the slag / gas discharge port 1c, it may become icicle-shaped. In this case, the slag cutter 9 is moved forward and backward to cut off the icicle-shaped slag. As a result, the slag is discharged smoothly.

The molten slag dropped into the cooling water tank 10 is
After being cooled and solidified in the water tank 10 to form a black granular sand-like material, it is discharged by the water-sealed flight conveyor 11.

On the other hand, the high temperature combustion gas in the combustion chamber 14 is
It is discharged from the slag / gas discharge port 1c, is cooled by the spray from the water spray nozzle 12 while passing through the flue 13, and is discharged into the atmosphere.

When the melting surface retreats as the melting progresses, each supply pusher 5 pushes the material 16 to be melted toward the central portion of the combustion chamber 14 to a fixed amount, and the inside of the combustion chamber 14 is always kept in an appropriate state depending on the combustion state. A layer of the melted material 16 is formed. Further, the melted material 16 located between the pushers 5a is the guide body 6
Is pushed down to the side of the pusher 5a, and is pushed into the center of the combustion chamber 14 favorably and surely by the pusher 5a. As a result, a constant amount of the material to be melted 16 is constantly supplied into the combustion chamber 14 to form an ideal layer of the material to be melted 16, and the melting process of the material to be melted 16 is performed smoothly and smoothly. Done.

In this melting furnace, a layer of the melted material 16 is formed in the vicinity of the peripheral wall 1a and the bottom wall 1b of the furnace body 1 so that the peripheral wall 1a and the bottom wall 1b are not exposed. Is less. As a result, less fuel is consumed and the life of the refractory material on the furnace wall is extended. Further, since the furnace body 1 and the ceiling wall 2 are fixed, the drive device for the furnace body 1 and the like can be omitted, and it is necessary to make the fuel supply pipes and combustion air supply pipes to the burner 3 all flexible. In addition, the structure of the melting furnace itself can be greatly simplified, and maintenance becomes extremely easy. Further, the material to be melted 16 is uniformly distributed to the annular storage chamber 15 by the distribution and supply device 4, and the material to be melted 16 supplied from the storage chamber 15 is sent to the central side of the combustion chamber 14 by the supply pusher 5 in a fixed amount. Therefore, the material 16 to be melted can be uniformly and smoothly supplied into the combustion chamber, and the melting process can be efficiently performed.

FIG. 4 shows another embodiment of the present invention in which a screw feeder 17 is provided between adjacent feed pushers 5 instead of the guide body 6 of the circular fixed melting furnace of the first embodiment. The melted material 16 supplied between the supply pushers 5 by the screw feeder 17 is transferred to the combustion chamber 14
It is designed to be transferred to the center side. That is, each screw feeder 17 is wound around the conical rotation shaft 17a, which is rotatably arranged in the cantilevered state at equal angular intervals on the outer peripheral edge of the bottom wall 1b of the furnace body 1, and the rotation shaft 17a. It is composed of screw blades 17b having the same height, and is configured so that the rotation speed can be freely controlled. Further, each screw feeder 17 is configured to be driven alone or in a plurality of sets by a driving device (not shown). The other structures (the furnace body 1, the ceiling wall 2, the burner 3, the distribution supply device 4, the supply pusher 5, etc.) have the same structure as that of the first embodiment. This circular rotary melting furnace can also achieve the same effects as the circular rotary melting of the first embodiment. In particular, supply pusher 5
The material 16 to be melted supplied between the screw feeder 1
Since it is forcibly transferred to the center side of the combustion chamber 14 by 7, it is possible to reliably send the melted substance 16 between the supply pushers 5 to the center side of the combustion chamber 14.

5 to 7 are schematic vertical sectional views of a circular fixed melting furnace according to still another embodiment of the present invention. The circular fixed melting furnace includes a furnace body 1, a ceiling wall 2 and a burner 3. , Distribution feeder 4, screw feeder 17, hopper 7, frame 8, water-cooled slag cutter 9, water tank 10, water-sealed flight conveyor 11, water spray nozzle 12 and flue 13
And the like, and the screw feeder 17 is provided in place of the feed pusher 5 and the guide body 6 of the circular fixed melting furnace of the first embodiment. The other structures (furnace body 1, ceiling wall 2, burner 3, distribution supply device 4, etc.) are the same as those of the first embodiment, and are the same as those of the first embodiment. Parts are given the same reference numbers.

The screw feeders 17 are arranged at equal angles on the outer peripheral edge of the bottom wall 1b of the furnace body 1, and the melted material 16 supplied from the storage chamber 15 is delivered to the center of the combustion chamber 14 in a fixed amount. It is to be transferred. That is, the screw feeder 17 is a conical rotating shaft 17a that is rotatably arranged in the outer peripheral edge portion of the bottom wall 1b of the furnace body 1 at equal angles and in a cantilever state, and the same rotating shaft 17a wound around the rotating shaft 17a. It is composed of a screw blade 17b having a height and is configured so that the rotation speed can be freely controlled. Also, each screw feeder 1
7 is configured to be driven by a driving device (not shown) alone or in plural sets. In addition, the screw blade 17
By setting b to be the same height, the melted material 16 can be fed substantially uniformly, and by setting the number of revolutions to continuously variable speed, the feed amount of the melted material 16 can be arbitrarily adjusted.

This circular rotary melting furnace can achieve the same effects as the circular rotary melting of the first embodiment. Needless to say, since the melted material 16 can be continuously fed and the amount of the melted material 16 fed can also be adjusted, a proper melted material 16 that always corresponds to the combustion state can be provided in the combustion chamber 14. The layer can be reliably formed, and the melting process of the melted material 16 can be performed more efficiently.

In each of the above-mentioned embodiments, the furnace body 1 and the ceiling wall 2 are formed in a circular shape in a plan view, but in other embodiments, the furnace body 1 and the ceiling wall 2 are polygonal. It may be formed in.

In each of the above embodiments, the material 16 to be melted is supplied from the hopper 7 into the storage chamber 15. However, in other embodiments, the rotary feeder is located above the storage chamber 15. A fixed amount supply device (not shown) such as
The melted material 16 may be supplied in a fixed amount into the storage chamber 15.

[0038]

As described above, the circular fixed melting furnace according to claim 1 of the present invention forms a layer of the melted material covering the furnace wall of the furnace body by the distribution supply device and the supply pusher, and the melted material is formed. Since the layer is melted from the surface side, it is possible to prevent the furnace wall from being exposed. As a result, less heat is radiated from the furnace wall, less fuel is consumed, and the life of the refractory material on the furnace wall is extended. Also, because the furnace body and ceiling wall are fixed, the rotation drive device for the furnace body and the lift drive device for the ceiling wall can be omitted, and all fuel supply pipes and combustion air supply pipes to the burner are flexible. There is no need to turn it on. As a result, the structure of the melting furnace itself can be greatly simplified, and maintenance becomes extremely easy. Furthermore, since the material to be melted is evenly distributed to the annular storage chamber by the distribution and supply device, and the material to be melted supplied from the storage chamber is sent to the central side of the combustion chamber by a plurality of supply pushers, the material to be melted Can be uniformly and smoothly supplied into the combustion chamber, and an ideal melted material layer can always be formed in the combustion chamber. As a result, the melting process of the material to be melted can be performed efficiently. Moreover, since the guide body is arranged between the adjacent supply pushers and the melted material located between the supply pushers is slid down toward the supply pusher side by the guide body, the melted material supplied to the annular storage chamber. Is satisfactorily and surely pushed into the center of the combustion chamber.

In the circular fixed type melting furnace according to the second to third aspects of the present invention, the following effects can be obtained in addition to the above effects. That is, in the melting furnace of claim 2, the screw feeder is provided between the adjacent supply pushers,
Since the melted material supplied between the supply pushers is forcibly transferred by the screw feeder, the melted material between the supply pushers is reliably pushed toward the center of the combustion chamber. Further, in the melting furnace of claim 3, a plurality of screw feeders for quantitatively transferring the melted material supplied from the storage chamber to the central side of the combustion chamber are arranged on the bottom wall of the furnace body. The molten material can be continuously fed into the combustion chamber, and the amount of the molten material fed can be adjusted. As a result, it is possible to reliably form an appropriate layer of the material to be melted according to the combustion state in the combustion chamber,
The melting process of the material to be melted can be performed more efficiently.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a circular fixed melting furnace according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of a distribution and supply device.

FIG. 3 is a schematic cross-sectional view of a bottom wall portion of a furnace body.

FIG. 4 is a schematic cross-sectional view of the bottom wall portion of the furnace body showing another embodiment of the present invention.

FIG. 5 is a schematic vertical sectional view of a circular fixed melting furnace according to still another embodiment of the present invention.

FIG. 6 is a schematic plan view of a distribution and supply device.

FIG. 7 is a schematic cross-sectional view of the bottom wall portion of the furnace body.

FIG. 8 is a schematic vertical sectional view of a conventional square fixed melting furnace.

FIG. 9 is a schematic vertical sectional view of a conventional circular rotary melting furnace.

FIG. 10 is a vertical sectional view of a main part of a circular rotary melting furnace.

[Explanation of symbols]

1 is a furnace body, 1a is a peripheral wall, 1b is a bottom wall, 1c is a slag,
Gas discharge port, 2 ceiling wall, 3 burner, 4 distribution supply device, 6 cutter body, 14 combustion chamber, 15 storage chamber, 16
Is a melted material, and 17 is a screw feeder.

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Claims (3)

(57) [Claims] 1. A substantially bottomed cylindrical furnace body (1) which is fixedly installed and has a slag / gas discharge port (1c) formed at the center of the bottom wall (1b), and above the furnace body (1). A combustion chamber (14) is formed between the furnace body (1) and the furnace body (1) in a fixed state, and an annular storage chamber (15) is formed between the furnace body (1) and the peripheral wall (1a). The incineration ash that is arranged in the ceiling wall (2) to be formed, the burner (3) provided in the ceiling wall (2), and the annular storage chamber (15) and is supplied to one location of the storage chamber (15). A distribution supply device (4) for uniformly distributing the melted material (16) to the storage chamber (15), and the distribution supply device (4) at the outer peripheral edge of the bottom wall (1b) of the furnace body (1) at equal angles, Storage chamber (1
5) the material to be melted (16) supplied from the combustion chamber (14)
A plurality of feed pushers (5) that push out a fixed amount toward the center side to form a layer of the mortar-shaped and to-be-melted substance (16) in the combustion chamber (14), and adjacent feed pushers (5)
Refractory having an inclination equal to or greater than the repose angle of the melted material (16) so that the melted material (16) disposed between the supply pushers (5) slides down to the supply pusher (5) side naturally . And a plurality of guide bodies (6) formed in the shape of a triangular pyramid . 2. A furnace body (1) having a substantially bottomed shape, which is installed in a fixed state and has a slag / gas discharge port (1c) formed in the center of the bottom wall (1b), and above the furnace body (1). A combustion chamber (14) is formed between the furnace body (1) and the furnace body (1) in a fixed state, and an annular storage chamber (15) is formed between the furnace body (1) and the peripheral wall (1a). The incineration ash that is arranged in the ceiling wall (2) to be formed, the burner (3) provided in the ceiling wall (2), and the annular storage chamber (15) and is supplied to one location of the storage chamber (15). A distribution supply device (4) for uniformly distributing the melted material (16) to the storage chamber (15), and the distribution supply device (4) at the outer peripheral edge of the bottom wall (1b) of the furnace body (1) at equal angles, Storage chamber (1
5) the material to be melted (16) supplied from the combustion chamber (14)
A plurality of feed pushers (5) that push out a fixed amount toward the center side to form a layer of the mortar-shaped and to-be-melted substance (16) in the combustion chamber (14), and adjacent feed pushers (5)
The melted material (16), which is arranged between the feed pushers (5) and is fed to the center of the combustion chamber (14), is commonly used.
A circular fixed melting furnace, characterized in that it is provided with a plurality of screw feeders (17) whose rotation speed can be freely controlled . 3. A substantially bottomed cylindrical furnace body (1) installed in a fixed state and having a slag / gas discharge port (1c) formed at the center of the bottom wall (1b), and above the furnace body (1). A combustion chamber (14) is formed between the furnace body (1) and the furnace body (1) in a fixed state, and an annular storage chamber (15) is formed between the furnace body (1) and the peripheral wall (1a). The incineration ash that is arranged in the ceiling wall (2) to be formed, the burner (3) provided in the ceiling wall (2), and the annular storage chamber (15) and is supplied to one location of the storage chamber (15). A distribution supply device (4) for uniformly distributing the melted material (16) to the storage chamber (15), and the distribution supply device (4) at the outer peripheral edge of the bottom wall (1b) of the furnace body (1) at equal angles, Storage chamber (1
5) the material to be melted (16) supplied from the combustion chamber (14)
Transferring a fixed amount to the center side to form a mortar-shaped and annular layer of the melted material (16) in the combustion chamber (14) and rotate it.
Multiple screw feeder that can be freely control the number (1
7) A circular fixed type melting furnace comprising: