JP2020060339A - Stoker furnace - Google Patents

Abstract

To continuously charge objects to be incinerated regardless of properties of the objects to be incinerated and eliminate unburned residue.SOLUTION: A stoker furnace 1 includes: a drying stage 11 disposed to be inclined so that a conveyance direction downstream side D1 of an object B to be incinerated faces downwards; a combustion stage 12 disposed to be inclined so that the conveyance direction downstream side faces upwards; and a post-combustion stage 13. While the object to be incinerated is sequentially conveyed at the drying stage 11, the combustion stage 12 and the post-combustion stage 13, drying, combustion and post-combustion are performed, respectively. In the stoker furnace 1, a conveyance section 14 for conveying the object to be incinerated to the conveyance direction downstream side is provided at least one of a space between the drying stage 11 and the combustion stage 12 or a space between the combustion stage 12 and the post-combustion stage 13. When arranged between the drying stage 11 and the combustion stage 12, the conveyance section 14 is disposed at an angle different from an inclination angle of each of the drying stage 11 and the combustion stage 12. When arranged between the combustion stage 12 and the post-combustion stage 13, the conveyance section is disposed at an angle different from an inclination angle of each of the combustion stage 12 and the post-combustion stage 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stoker furnace.

  As an incinerator that incinerates incineration objects such as garbage, there is known a stoker oven that can efficiently incinerate a large amount of incineration objects without selecting. As a stoker furnace, there is known a stoker in which a stoker is configured in a stepwise manner and is provided with a drying stage, a combustion stage, and a post-combustion stage so that each function of drying, combustion, and post-combustion can be performed.

  In order to reliably burn the incinerated matter, the inclination angle of the stoker is being studied. For example, as described in Patent Document 1 and Patent Document 2, the inclination angle of the stoker is inclined so that the downstream side in the transport direction of the installation surface of all stages of the drying stage, the combustion stage, and the post combustion stage is downward. There are things that are doing. Hereinafter, for example, when the downstream side of the installation surface of the drying stage in the transport direction is downward, the drying stage is simply downward (the same applies to the combustion stage and the post-combustion stage).

Further, as described in Patent Document 3, the drying stage is inclined downward, and the combustion stage and the post-combustion stage are arranged horizontally, and as described in Patent Document 4, the drying stage and The combustion stage is inclined downward and the installation side of the post combustion stage is inclined so that the downstream side in the transport direction is upward, and all the stages as described in Patent Document 5 are inclined upward. There is something. Note that, for example, when the downstream side of the installation surface of the combustion stage in the conveying direction is upward, the combustion stage is simply referred to as upward (the same applies to the drying stage and the post-combustion stage).
Further, as described in Patent Document 6, there is one in which the drying stage is inclined downward, and the combustion stage and the post-combustion stage are inclined upward.

JP-A-6-265125 JP, 59-86814, A Japanese Utility Model Publication No. 6-84140 Japanese Patent Publication No. 57-12053 Japanese Utility Model Publication No. 57-127129 Japanese Patent No. 6397107

  By the way, in the stoker furnaces of Patent Documents 1 to 5, although incineration materials having various properties (material, shape, water content) are put in, incineration materials having slippery materials or spherical shapes such as spheres can be used. It was difficult to incinerate incinerators with a high water content (high water content) in any stoker furnace like other incinerators.

  That is, in the stoker furnaces described in Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4, the drying stage is inclined downward and the combustion stage is inclined downward or horizontally. However, since the incineration material that is slippery or has a shape that easily rolls is transported to the post-combustion stage earlier than other incineration objects, there is a problem that it is not fully incinerated and is discharged while remaining unburned. .

  Further, in the stoker furnace described in Patent Document 5, all of the drying stage, the combustion stage, and the post-combustion stage are inclined upward, so that the incinerated material having a slippery material or the shape that easily rolls and the moisture content is high. The materials to be incinerated accumulate at the bottom of the step (drop wall) that is placed between the feeder and the drying stage, and it becomes difficult to convey them to the combustion stage, so the input amount is limited or the input is temporarily stopped. There was a problem that it might be necessary.

Then, the stoker furnace of patent document 6 which solves the said subject was developed. The stoker furnace of Patent Document 6 is extremely excellent in that the incineration object can be continuously charged regardless of the property of the incineration object and the unburned residue of the incineration object can be eliminated.
However, in the stoker furnace in which the drying stage inclines downward and the combustion stage inclines upward as in Patent Document 6, even if the supply amount of the incineration substance to the feeder is constant over time, In the case where the properties are inhomogeneous, especially when the incineration object suddenly changes from the inflammable property to the incombustible property, the incineration object temporarily accumulates between the drying stage and the combustion stage. If there is a step (fall wall) between the drying stage and the combustion stage, it will temporarily accumulate at the bottom of the step (fall wall). The same applies when the amount of incineration material supplied to the feeder is uneven in time. In the specification of the present application, the aggregate of the incinerated materials that have accumulated is referred to as a “trash reservoir”.

In the stoker furnace of Patent Document 6, even if a dust accumulation occurs temporarily, the incinerator is reliably conveyed to the combustion stage, so that the dust accumulation disappears with the passage of time. However, even if it is temporary, there is a risk that combustion performance will be affected if dust accumulation occurs.Therefore, increase the drive speed of the moving grate in the combustion stage to transfer the incineration material in the dust accumulation to the combustion stage. By moving the waste in the same direction at an early stage, the waste is quickly eliminated.
However, increasing the driving speed of the moving grate in the combustion stage from a predetermined speed shortens the retention time of the incineration object in the combustion stage shorter than the predetermined retention time, which may also affect the combustion performance. Further, if the driving speed of the moving grate in the combustion stage is increased from a predetermined speed, wear of the grate itself is promoted, which may affect the durability of the grate.
The same applies when there is a step (drop wall) between the combustion stage and the post-combustion stage.

  Therefore, in the present invention, in the stoker furnace in which the drying stage is facing downward, the combustion stage is facing upward, and the post-combustion stage is arranged, the retention time of the incineration material in the combustion stage or the post-combustion stage is not changed from the predetermined retention time. It is an object of the present invention to provide a stoker furnace that can eliminate waste accumulation at an early stage.

  According to the present invention, the stoker furnace has a drying stage that is inclined so that the downstream side of the incineration object in the transport direction is downward, and a combustion stage that is inclined so that the downstream side of the transport direction is upward. A stage and a post-combustion stage, the incinerator is supplied from a feeder, the drying stage having a plurality of fixed grate and a plurality of moving grate, the combustion stage, and the post-combustion stage, In a stoker furnace that performs drying, combustion, and post-combustion, respectively, while sequentially transporting the incineration material, and discharges the post-combustion material from the discharge chute connected to the post-combustion stage, the drying stage Between the combustion stage and the combustion stage, or at least one of the combustion stage and the post-combustion stage, has a transport unit that transports the incineration object downstream in the transport direction, the transport unit, Disposed between the drying stage and the combustion stage In this case, when arranged at an angle different from the inclination of each of the drying stage and the combustion stage, and arranged between the combustion stage and the post combustion stage, the inclination of each of the combustion stage and the post combustion stage is It is characterized by being arranged at different angles.

  According to such a configuration, since the incineration material in the dust sump can be quickly moved in the transport direction, it is possible to change the residence time of the incineration material in the combustion stage or the post-combustion stage from the predetermined retention time. , It is possible to eliminate the garbage collection at an early stage. Since the residence time of the incineration object is not changed from the predetermined residence time, that is, it is not necessary to increase the driving speed of the moving grate from the predetermined speed, the durability of the grate can be set as expected.

  According to the present invention, in the stoker furnace in which the drying stage is downward, the combustion stage is upward, and the post-combustion stage is arranged, the residence time of the incineration material in the combustion stage or the post-combustion stage is not changed from the predetermined retention time. At the same time, it is possible to provide a stoker furnace that can quickly eliminate the dust accumulation.

It is a schematic block diagram of the stoker furnace of 1st embodiment of this invention. It is a figure explaining the structure of the stoker of the stoker furnace of 1st embodiment of this invention. It is a side view explaining the grate shape of the stoker furnace of a first embodiment of the present invention. It is a figure explaining the structure of the stoker of the stoker furnace of 2nd embodiment of this invention.

[First embodiment]
Hereinafter, a stoker furnace according to a first embodiment of the present invention will be described in detail with reference to the drawings.
The stoker furnace of the present embodiment is a stoker furnace for burning incineration objects such as garbage, and as shown in FIG. 1, a hopper 2 for temporarily storing the incineration objects B and an incineration for burning the incineration objects B. The furnace 3, the feeder 4 for supplying the incineration object B to the incinerator 3, and the stoker 5 (the drying stage 11, the combustion stage 12, and the grate 15 of the post-combustion stage 13, which are provided on the bottom side of the incinerator 3, 16 and a grate of the transport unit 14), and a wind box 6 provided below the stoker 5.

The feeder 4 continuously pushes the incineration object B supplied onto the feed table 7 through the hopper 2 into the incinerator 3. The feeder 4 reciprocates on the feed table 7 with a predetermined stroke by the feeder driving device 8.
The wind box 6 supplies primary air from a blower (not shown) to each part of the stoker 5.
The incinerator 3 is provided above the stoker 5 and has a combustion chamber 9 composed of a primary combustion chamber and a secondary combustion chamber. The incinerator 3 has a secondary air supply nozzle 10 that supplies secondary air to the combustion chamber 9.

The stokers of the drying stage 11, the combustion stage 12, and the post-combustion stage 13 of the stoker 5 are sliding stokers in which every one of the grates 15 and 16 is sequentially arranged.
In the stalker 5, the transport unit 14 is a track-type floor-mounted stoker in which a large number of grate are attached to an endless chain surrounding at least two rotating rollers. The floor transfer type stoker can rotate the grate attached to the endless chain by rotating the rotating roller in one direction.

The transfer unit 14 will be described as the floor transfer type stoker here, but the present invention is not limited to this, and the grates 15 and 16 are sequentially arranged like the drying stage 11, the combustion stage 12, or the post-combustion stage 13. A sliding stoker may be used.
The direction in which the incineration object B is transported is referred to as a transport direction D. The incineration object B is conveyed on the stoker 5 in the conveyance direction D. 1, 2, and 3, the right side is the downstream side D1 in the transport direction.

Further, in the drying stage 11, the combustion stage 12, and the post-combustion stage 13, the surfaces to which the grate is attached are referred to as installation surfaces. With respect to the upstream end portions (11b, 12b, 13b) of the drying stage 11, the combustion stage 12, and the post-combustion stage 13, the angle on the transport direction D side formed by the horizontal plane and the installation surface is the stoker inclination angle ( Installation angle).
In the transfer unit 14, when the transfer unit 14 is the above-mentioned sliding stoker, the installation surface and the stoker inclination angle (installation angle) are the same as those of the drying stage 11, the combustion stage 12, and the post-combustion stage 13. Good. On the other hand, when the transfer unit 14 is the above-mentioned floor transfer type stoker, since the grate is attached to the endless chain, the installation surface is an endless chain and the stoker inclination angle is not set to a specific value. Therefore, in this case, a virtual straight line is drawn between the rotary roller R1 (14b) arranged on the most upstream side and the rotary roller R2 arranged on the most downstream side in the transport direction D, and the horizontal plane and the straight line are drawn. The angle formed by and on the side of the conveyance direction D is referred to as a stoker inclination angle (installation angle). Further, the installation surface in this case means a surface formed by the straight line and a line perpendicular to the paper surface of FIG.
In the following description, the stoker inclination angle is a positive value when the downstream side of the installation surface in the conveying direction is above the horizontal plane, and the stoker inclination angle is a negative value when the downstream side of the installation surface in the conveying direction is below the horizontal plane.

The stoker 5 includes, in order from the upstream side in the conveying direction of the incineration object B, a drying stage 11 for drying the incineration item B, a conveying section 14 for transferring the incineration item B that has passed through the drying stage 11 to the combustion stage 12, It has a combustion stage 12 that incinerates the incinerated material B, and a post-combustion stage 13 that completely incinerates the unburned components of the incineration material B that has passed through the combustion stage 12 (post-combustion).
Here, for convenience of description, the transport unit 14 and the combustion stage 12 are described as separate parts, but the transport unit 14 may be a part of the combustion stage 12. That is, the transport unit 14 may have a function to incinerate the incineration target B as a part of the combustion stage 12 as in the combustion stage 12.

Each stage 11, 12, 13 has a plurality of fixed grate 15 and a plurality of moving grate 16.
The fixed grate 15 and the moving grate 16 are alternately arranged in the transport direction D. The moving grate 16 reciprocates in the transport direction D of the incineration object B. Due to the reciprocating motion of the moving grate 16, the incineration object B on the stoker 5 is transported and stirred. That is, the lower layer portion of the incineration object B is moved and replaced with the upper layer portion of the incineration object B.
The same configuration is applied when the transport unit 14 is the above-mentioned sliding stoker.

  The drying stage 11 receives the incineration object B pushed out by the feeder 4, evaporates the moisture of the incineration object B to dry it, and partially decomposes it.

  The transport unit 14 is arranged between the drying stage 11 and the combustion stage 12. The transport unit 14 is driven by the rotation of the rotary roller R1 or R2 so that the upper side of the endless chain moves to the downstream side D1 in the transport direction. Therefore, the grate attached to the endless chain rotates like a belt conveyor or a caterpillar, and the incinerated material B on the grate attached above the endless chain (the incinerated material B that has passed through the drying stage 11) is removed. , To the combustion stage 12 and to the downstream side D1 in the transport direction.

The combustion stage 12 receives the incineration object B conveyed by the conveyance part 14, ignites the incineration object B by the primary air supplied from the lower wind box 6, and burns the volatile matter and the fixed carbon content. As described above, the transport unit 14 may function as a part of the combustion stage 12, and the transport unit 14 may ignite the incineration object B and burn the incineration object B.
The post-combustion stage 13 burns unburned carbon and other unburned components that have passed through the combustion stage 12 without being combusted until they completely become ash. That is, the unburned component is incinerated.
A discharge chute 17 is provided at the exit of the post combustion stage 13. The ash is discharged from the incinerator 3 through the discharge chute 17.

The stoker furnace 1 has a front arch 31 extending from above the feeder 4 to at least above the drying stage 11, and a rear arch 32 extending from above the discharge chute 17 to at least above the post combustion stage 13. There is. That is, the end 31b on the downstream side D1 of the front arch 31 in the transport direction is located above the drying stage 11 or the combustion stage 12. Further, the end portion 32 a of the rear arch 32 on the upstream side in the transport direction is located above the combustion stage 12 or the post combustion stage 13.
The front arch 31 and the rear arch 32 are connected to the furnace wall 33 of the incinerator 3. The furnace wall 33 has a rectangular tubular shape, and guides the exhaust gas generated by the combustion of the incineration object B. The furnace wall 33 has a front wall 34 and a rear wall 35 facing the transport direction D, and a pair of side walls 36 along the transport direction D. The distance between the front wall 34 and the rear wall 35 and the distance between the pair of side walls 36 are, for example, 3 m to 4 m. The front wall 34 is arranged upstream of the rear wall 35 in the transport direction D.

The center line C of the rectangular tubular furnace wall 33 is on the combustion stage 12. That is, the center line C passing through the center of the furnace wall 33 along the front wall 34, the rear wall 35, and the side wall 36 intersects with the combustion stage 12.
The secondary air supply nozzle 10 is arranged on the front wall 34 and the rear wall 35. The secondary air supply nozzle 10 is oriented to inject secondary air from the front wall 34 and the rear wall 35 toward the center of the furnace wall 33.
Although the secondary air supply nozzle 10 is arranged on the front wall 34 and the rear wall 35 in this embodiment, it may be arranged on the front arch 31 and the rear arch 32.
Further, although the furnace wall 33 is described here as a rectangular tube shape, it is not limited to the rectangular tube shape and may be a cylindrical shape (cylindrical shape).

The front arch 31 and the rear arch 32 are portions that form the ceiling (upper wall) of the stoker 5. An end 31 a of the front arch 31 on the upstream side in the transport direction is located above the feeder 4. The vertical interval between the end 31a of the front arch 31 on the upstream side in the transport direction and the feeder 4 is about 1 m.
The front arch 31 is inclined so that the end 31b on the downstream side D1 in the transport direction is higher than the end 31a on the upstream side in the transport direction. That is, the front arch 31 is inclined so that the space inside the stoker 5 becomes wider toward the downstream side D1 in the transport direction.

The vertical interval between the end portion 32b of the rear arch 32 on the downstream side D1 in the transport direction and the end portion of the post combustion stage 13 on the downstream side D1 in the transport direction is about 1 m.
An end 32b of the rear arch 32 on the downstream side D1 in the transport direction is located above the discharge chute 17. The rear arch 32 is inclined so that the end portion 32b on the downstream side D1 in the transport direction is lower than the end portion 32a on the upstream side in the transport direction. That is, the rear arch 32 is inclined so that the space inside the stoker 5 becomes narrower toward the downstream side D1 in the transport direction.

Each of the drying stage 11, the combustion stage 12, and the post-combustion stage 13 has a drive mechanism 18 for driving the moving grate 16. That is, the drying stage 11, the combustion stage 12, and the post-combustion stage 13 each individually have a drive mechanism 18 that drives a plurality of moving grate 16.
Further, although not shown, in the case of the sliding type stoker, the conveying unit 14 has a drive mechanism 18 for driving the moving grate 16, and in the case of the floor moving type stoker, the rotating roller R1 or R2 is rotated. It has a drive mechanism (a drive mechanism different from the drive mechanism 18).

  The drive mechanism 18 is attached to a beam 19 provided on the stoker 5. The drive mechanism 18 has a hydraulic cylinder 20 attached to the beam 19, an arm 21 operated by the hydraulic cylinder 20, and a beam 22 connected to the tip of the arm 21. The beam 22 and the moving grate 16 are connected via a bracket 23.

  According to the drive mechanism 18, the arm 21 operates by expanding and contracting the rod of the hydraulic cylinder 20. With the operation of the arm 21, the beam 22 configured to move along the installation surface 11a of the drying stage 11, the installation surface 12a of the combustion stage 12, and the installation surface 13a of the post combustion stage 13 moves, A moving grate 16 connected to the motor drives.

  The drive mechanism 18 uses the hydraulic cylinder 20, but the drive mechanism 18 is not limited to this. For example, a hydraulic motor, an electric cylinder, a conductive linear motor, or the like can be adopted. Further, the form of the drive mechanism 18 is not limited to the form described above, and may be any form as long as the moving grate 16 can be reciprocated. For example, the beam 22 and the hydraulic cylinder 20 may be directly connected and driven without disposing the arm 21.

In the stoker furnace 1, the driving speeds of the moving grate 16 in the drying stage 11, the combustion stage 12, and the post-combustion stage 13 are the same as each other, or at least one of the drying stage 11, the combustion stage 12, and the post-combustion stage 13 is used. Parts can have different speeds.
For example, when the incineration material B required to be sufficiently combusted in the combustion stage 12 is input, the drive speed of the moving grate 16 of the combustion stage 12 is slowed down, and the incineration material on the combustion stage 12 is decreased. The conveying speed of B can be slowed down, and can be burned sufficiently.
On the other hand, the transport speed of the transport unit 14 is set to be higher than the transport speed of the incineration object B on the drying stage 11, and the dust accumulation generated between the drying stage 11 and the combustion stage 12 is eliminated early.

  As shown in FIGS. 2 and 3, the fixed grate 15 and the moving grate 16 are downstream in the transport direction with respect to the installation surfaces 11 a, 12 a, and 13 a of the drying stage 11, the combustion stage 12, and the post-combustion stage 13, respectively. It is arranged so that the side faces upward.

A part of the moving grate 16 of the drying stage 11 is a grate with projection 16P (the other is a normal grate described later). Of the length of the drying stage 11 in the transport direction, the moving grate 16 in the range of 50% to 80% from the downstream side in the transport direction is the grate with protrusion 16P. By using the grate with projection 16P, stirring power can be improved.
As shown in FIG. 3, the grate with projection 16P has a plate-shaped grate body 25 and a triangular-shaped projection 26 provided at the tip of the grate body 25. The protrusion 26 projects upward from the upper surface of the grate body 25. The shape of the protrusion 26 is not limited to this, and may be, for example, a trapezoidal shape or a round shape.
Here, the fixed grate 15 in FIG. 3 is a grate having no protrusion on the upper surface of the tip, and this shape is called a normal grate.

In the present embodiment, only the moving grate 16 is the protruding grate 16P, but the present invention is not limited to this, and both the moving grate 16 and the fixed grate 15 may be the protruding grate.
Further, the range in which the grate with projection 16P is provided is not limited to the above-described range, and for example, all the grate in the drying stage 11 may be the grate with projection 16P.
Further, depending on the nature and type of the incineration object B, all the grate (fixed grate and moving grate) in the drying stage may be the normal grate.

Similar to the drying stage 11, at least a part of the moving grate 16 of the combustion stage 12 can be a grate with projection 16P. Similar to the drying stage, both the moving grate 16 and the fixed grate 15 may be a grate with protrusions, depending on the nature and type of the incinerated material B, or all grate (fixed grate and moving grate). May be a normal grate.
As for the grate of the post-combustion stage 13, both the moving grate 16 and the fixed grate 15 are shown as normal grate in FIG. 2, but like the drying stage 11 and the combustion stage 12, a grate with protrusions is used. May be adopted.
If the carrier 14 is a sliding stoker, a normal grate or a grate with protrusions may be employed.

Next, the stoker inclination angle (installation angle) of the drying stage 11, the combustion stage 12, the post-combustion stage 13, and the transport unit 14 will be described.
The drying stage 11, the combustion stage 12, the post-combustion stage 13, and the transfer section 14 are inclined so that their main surfaces face the main combustion section M. Here, the main combustion portion M is near the lower end of the furnace wall 33 having a square tubular shape (in other words, near the end portion 31b of the front arch 31 and the end portion 32a of the rear arch 32) due to the combustion of the incineration object B. Is a portion that occurs near the center line C of the furnace wall 33 and above the incineration object B. Radiant heat H from the flame of the main combustion part M is emitted radially centering on the main combustion part M.

As shown in FIG. 2, the drying stage 11 is arranged downward. That is, the installation surface 11a of the drying stage 11 is inclined so that the downstream side D1 in the transport direction becomes lower. Specifically, the stoker inclination angle θ1 of the drying stage 11, which is the angle between the horizontal plane centering on the upstream end 11b of the drying stage 11 and the installation surface 11a, is -15 ° (minus 15 degrees). From −25 ° (minus 25 °).
As a result, the main surface (installation surface 11a) of the drying stage 11 faces the main combustion section M and receives the radiant heat H efficiently.

The combustion stage 12 is arranged upward. That is, the installation surface 12a of the combustion stage 12 is inclined so that the downstream side D1 in the transport direction becomes higher. Specifically, the stoker inclination angle θ2 of the combustion stage 12, which is the angle between the horizontal plane centering on the upstream end 12b of the combustion stage 12 and the installation surface 12a, is from + 5 ° (plus 5 degrees). An angle between + 15 ° (plus 15 degrees), preferably between + 8 ° (plus 5 degrees) and + 12 ° (plus 15 degrees).
As a result, the main surface (installation surface 12a) of the combustion stage 12 faces the main combustion section M and receives the radiant heat H efficiently.

The transport unit 14 is arranged such that its installation surface has an angle different from the inclination of each of the drying stage 11 and the combustion stage 12. Specifically, the stoker inclination angle θ4, which is the angle between the horizontal plane centered on the upstream end 14b of the transport unit 14 and the installation surface, is from −25 ° (minus 25 °) to + 15 ° (plus). The angle is between 15 °, preferably −5 ° (minus 5 °) to + 5 ° (plus 5 °), which is substantially horizontal, and more preferably horizontal (0 °).
As a result, the main surface of the transport unit 14 faces the main combustion unit M and receives the radiant heat H efficiently.

The post-combustion stage 13 is arranged upward. That is, the installation surface 13a of the post combustion stage 13 is inclined so that the downstream side D1 in the transport direction becomes higher.
The stalker inclination angle θ3 of the post-combustion stage 13, which is the angle between the horizontal plane centered on the upstream end 13b of the post-combustion stage 13 and the installation surface 13a, is the same as the stalker inclination angle θ2 of the combustion stage 12. is there. Specifically, the stoker inclination angle θ3 of the post-combustion stage 13, which is the angle between the horizontal surface centering on the upstream end 13b of the post-combustion stage 13 and the installation surface 13a, is + 5 ° (plus 5 degrees). ) To + 15 ° (plus 15 degrees), preferably + 8 ° (plus 8 degrees) to + 12 ° (plus 12 degrees).
As a result, the main surface (installation surface 13a) of the post-combustion stage 13 faces the main combustion section M and efficiently receives the radiant heat H.
The stoker inclination angle θ3 of the post combustion stage 13 may be θ2 ≠ θ3 or θ2 = θ3.

With such a configuration, the incineration object can be continuously charged regardless of the property of the incineration object, and the unburned residue of the incineration object can be eliminated.
Further, since the main surfaces of the drying stage 11, the transport section 14, the combustion stage 12, and the post-combustion stage 13 face the main combustion section M, the radiant heat H of the main combustion section M can be effectively received. Further, since the center line C of the furnace wall 33 is on the combustion stage 12, the position of the main combustion section M is set on the combustion stage 12, and the drying stage 11, the transport unit 14, the combustion stage 12, and the post-combustion stage 13 are arranged. The radiant heat H can be efficiently applied. Therefore, the drying efficiency can be improved in the drying stage 11, and the combustion efficiency can be improved in the transport unit 14 and the combustion stage 12. Also in the post combustion stage 13, the incineration object B can be effectively incinerated.
When the incineration of the material B to be burned progresses sufficiently in the combustion stage 12, the post-combustion stage 13 is arranged horizontally or downward in order to reduce the power of the drive mechanism 18 and reduce the operating cost. May be.

A step (drop wall) 27 is formed between the drying stage 11 and the combustion stage 12. The transport unit 14 is disposed between the lower end of the step 27 and the upstream end 12b of the combustion stage 12. An end portion 11c on the downstream side in the transport direction of the drying stage 11 is formed to be higher in the vertical direction than an end portion 12b on the upstream side in the transport direction of the combustion stage 12.
There is no step (drop wall) between the combustion stage 12 and the post combustion stage 13. That is, the combustion stage 12 and the post-combustion stage 13 are continuously connected. In other words, the combustion stage 12 and the post-combustion stage 13 are arranged such that the end 12c of the combustion stage 12 on the downstream side in the transport direction and the end 13b of the post-combustion stage 13 on the upstream side in the transport direction have the same height. Has been formed.
As a result, the end portion 13c of the post combustion stage 13 is arranged above the end portion 12c of the combustion stage 12. Therefore, even if the incineration object B rolls down in the drying stage 11, the incineration item B can be prevented from being discharged from the post combustion stage 13 without being sufficiently combusted.
In addition, since the transport unit 14 is arranged mainly for the purpose of quickly eliminating the dust accumulation that occurs between the drying stage 11 and the combustion stage 12, the horizontal length L1 of the transport unit 14 is It may be shorter than the horizontal length L2 of the step 12. Specifically, the length L1 may be 1/3 or less of the length L2.

According to the above-described embodiment, in the stoker furnace in which the drying stage is facing downward, the combustion stage is facing upward, and the post-combustion stage is arranged, the conveying unit promptly removes the incineration material in the dust pool generated between the drying stage and the combustion stage. Since it is conveyed to the combustion stage, the dust accumulation can be eliminated early without changing the retention time of the incineration object in the combustion stage from the predetermined retention time.
In addition, since the residence time of the incineration object is not changed from the predetermined residence time, that is, it is not necessary to increase the drive speed of the moving grate in the combustion stage from the predetermined speed, the durability of the grate of the combustion stage is as expected. Can be

[Second embodiment]
Hereinafter, a stoker furnace according to a second embodiment of the present invention will be described in detail with reference to the drawings. In the present embodiment, differences from the above-described first embodiment will be mainly described, and description of similar parts will be omitted.
As shown in FIG. 7, a step (drop wall) 28 is formed between the combustion stage 12 and the post combustion stage 13 of the stoker 5 of this embodiment. The transport unit 14B of the present embodiment is arranged between the combustion stage 12 and the post-combustion stage 13. Specifically, the transport unit 14B is arranged between the lower end of the step 28 and the upstream end 13b of the post combustion stage 13.

Similar to the first embodiment, the transport unit 14B is arranged such that its installation surface has an angle different from the inclination of each of the combustion stage 12 and the post-combustion stage 13.
The transport unit 14B is disposed mainly for the purpose of eliminating the dust pool generated between the combustion stage 12 and the post-combustion stage 13, specifically, the dust pool of the step (drop wall) 28 at an early stage. The horizontal length l1 of the portion 14B may be shorter than the horizontal length l2 of the post combustion stage 13. Specifically, the length l1 may be 1/3 or less of the length l2.
In addition, the transport speed of the transport unit 14B is set to be higher than the transport speed of the incineration object B on the combustion stage 12, and the dust accumulation generated between the combustion stage 12 and the post-combustion stage 13 is eliminated early.

  The end portion 12c of the combustion stage 12 on the downstream side in the conveying direction and the end portion 13c of the post combustion stage 13 on the downstream side in the conveying direction are placed in the same direction in the vertical direction, or the end portion 13c of the post combustion stage 13 is located at the end portion 13c. Is disposed above the end portion 12c of. The stoker furnace 1 of the present embodiment is an example in which the downstream end 12c of the combustion stage 12 in the transport direction and the downstream end 13c of the post-combustion stage 13 in the transport direction are at the same position in the vertical direction.

As a result, even if the incineration object B rolls down in the drying stage 11, the incineration item B can be prevented from being discharged from the post combustion stage 13 without being sufficiently combusted.
In addition, since the transport unit quickly transports the incineration material in the dust pool generated between the combustion stage and the post-combustion stage to the post-combustion stage, the retention time of the incineration product in the post-combustion stage is changed from the predetermined retention time. Even without doing so, it is possible to eliminate the garbage collection at an early stage.
Since the residence time of the incineration object is not changed from the predetermined residence time, that is, it is not necessary to increase the drive speed of the moving grate in the post combustion stage from the specified speed, the durability of the grate in the post combustion stage is as expected. Can be

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes design changes and the like within the scope not departing from the gist of the present invention. .
In addition, in the above-mentioned embodiment, although the tips of the grate 15 and 16 are arranged so as to face the downstream side D1 in the transport direction, the present invention is not limited to this, and for example, the tips of the grate 15 and 16 of the drying stage 11 are provided. May be arranged so as to face the upstream side in the transport direction.

  In addition, the transport sections may be arranged both between the drying stage 11 and the combustion stage 12 and between the combustion stage 12 and the post-combustion stage 13, respectively.

1 stoker furnace 2 hopper 3 incinerator 4 feeder 5 stoker 6 wind box 7 feed table 8 feeder drive device 9 combustion chamber 10 secondary air supply nozzle 11 drying stage 11a drying stage installation surface 12 combustion stage 12a combustion stage installation surface 13 Post-combustion stage 13a Post-combustion stage installation surface 14, 14B Transport section 15 Fixed grate 16 Moving grate 16P Grate with protrusion 17 Discharge chute 18 Drive mechanism 19 Beam 20 Hydraulic cylinder 21 Arm 22 Beam 23 Bracket 25 Grate body 26 Protrusion 27, 28 Step (drop wall)
31 Front arch 32 Rear arch 33 Furnace wall 34 Front wall 35 Rear wall 36 Side wall B Incinerator C Center line D Transport direction D1 Transport direction downstream side H Radiant heat M Main combustion part R1, R2 Rotating rollers θ1, θ2, θ3, θ4 Stalker Inclination angle

Claims (5)

A drying stage inclined so that the downstream side in the transport direction of the incineration object is downward, a combustion stage inclined in such a manner that the downstream side in the transport direction is upward, and a post-combustion stage, Supplying the incineration from the feeder, the drying stage having a plurality of fixed grate and a plurality of moving grate, the combustion stage, and the post-combustion stage, while sequentially conveying the incineration, respectively. In a stoker furnace that performs drying, combustion, and post-combustion, and discharges the incineration object after the post-combustion from an exhaust chute connected to the post-combustion stage,
Between the drying stage and the combustion stage, or at least one of the combustion stage and the post-combustion stage, a transport unit for transporting the incineration object downstream in the transport direction,
When the transport unit is disposed between the drying stage and the combustion stage, the transport unit is disposed at an angle different from the inclination of each of the drying stage and the combustion stage, and between the combustion stage and the post-combustion stage. The stoker furnace is arranged at an angle different from the inclination of each of the combustion stage and the post-combustion stage. A front arch extending from above the feeder to above the drying stage or the combustion stage;
A rear arch extending from above the discharge chute to above the post-combustion stage or above the combustion stage;
Further comprising a tubular or rectangular tubular furnace wall that is connected to the front arch and the rear arch and guides exhaust gas generated by combustion of the incineration object,
The center line of the furnace wall is above the combustion stage, and the main surfaces of the drying stage, the combustion stage, the post-combustion stage, and the transfer unit are generated above the combustion stage. The stoker furnace according to claim 1, which is suitable for use in a stoker furnace.   The transfer unit is a moving bed type stoker configured in a track shape by attaching a large number of grate to an endless chain, or a sliding stoker in which the fixed grate and the moving grate are sequentially arranged. The stoker furnace according to claim 2, wherein the stoker furnace is a stoker furnace.   The transfer section is arranged substantially horizontally, and is arranged at at least one of a step between the drying stage and the combustion stage or a step between the combustion stage and the post-combustion stage. The stoker furnace according to claim 3, wherein the stoker furnace is a stoker furnace.   The downstream end of the post-combustion stage in the transport direction is arranged at the same position as the downstream end of the combustion stage in the transport direction or above the end of the combustion stage in the vertical direction. The stoker furnace according to claim 1, wherein the stoker furnace is a stoker furnace.

Images