JPH0960839A - Supplying nozzle for object to be incinerated of incinerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supplying nozzle of an object to be incinerated of an incinerator which enables stable operation of the incinerator by preventing the lowering of matters to be incinerated supplied such as sludge of wastes with a high water content. SOLUTION: An incinerator 10 has a sludge supply path 40 extending in the direction of the axis line thereof and a sludge discharge port 41 at the tip thereof is provided reaching a combustion chamber 12 of the incinerator. A scraper 31 for peeling clung matters which is made rotatable about an axis line of a path 40, having a required width in the axial direction of the sludge supplying path 40 is provided inside the path 40 at the tip of a sludge supplying nozzle 20 of the incinerator and made movable in the direction of the axis line of the path 40 as well. At least two scrapers 31 and 31 are arranged at an interval in the circumferential direction of the path 40. A blade with an acute angle is formed at each tip of the scrapers 31 and 31. A top part is formed at positions on the delayed side and on the advancing side of the blades respectively in the same direction of rotation and the top parts the blades are arranged in proximity to the internal surface of the path 40.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an incinerator for supplying incinerators such as fluidized bed incinerators and incinerator boilers with high water content wastes such as sludge, coffee dregs, tea dregs and beer barley dregs. It relates to an incinerator supply nozzle for a furnace.

[0002]

2. Description of the Related Art Conventionally, when incinerating sludge as an incinerator, for example, in a fluidized bed incinerator as an incinerator, the incinerator discharge port at the tip of the incinerator supply passage is exposed to the combustion chamber of the incinerator. To the attached incinerator feed nozzle, the sludge stored in the hopper is pressure-fed through a transport pipe by a sludge feeder such as a screw pump or a screw feeder,
The incinerator supply nozzle ejects pressurized dispersion steam (steam) from a large number of incinerator-dispersing fluid jets provided around the incinerator discharge port at the tip of the incinerator feed nozzle. By dispersing the sludge discharged from the fluidized bed, the sludge is dispersedly supplied into the fluidized bed at a high temperature of the fluidized bed incinerator and burned and incinerated.

[0003]

However, the combustion chamber of the fluidized bed incinerator for burning and incinerating sludge or other incinerator has a high temperature atmosphere (for example, 750 to 800 ° C.), and the combustion chamber (inside the furnace is ) Radiant heat, etc. causes the sludge to burn on the incinerator discharge port at the tip of the supply nozzle and sticks to the incinerator discharge port, which reduces the supply amount and enables stable operation of the incinerator. Disappear. The baking of this sludge becomes more remarkable in the case of a sludge having a higher calorific value.

The present invention has been made in view of the problem of the incinerator supply nozzle of the conventional incinerator as described above, and it is possible to prevent burning, sticking or sticking of incinerated matter such as sludge at the incinerator discharge port. An object of the present invention is to provide an incinerator supply nozzle for an incinerator, which can be peeled and removed to prevent a decrease in the amount of the incinerator supply and to stably operate the incinerator.

[0005]

In order to achieve the above object, the incinerator supply nozzle of the incinerator of the present invention comprises:

(1) An incinerator supply nozzle having an incinerator supply passage extending in a tubular shape in the axial direction and having an incinerator discharge port at its tip facing the combustion chamber of the incinerator and attached. A fixed object having a required width in the axial direction of the passage inside the incinerator supply passage near the incinerator discharge port at the tip of the incinerator feed nozzle and rotatable about the axis of the passage. The scraper for peeling was provided.

With such a construction, even if the incinerated matter such as sludge sticks to the inner surface of the incinerator discharge port of the incinerator supply passage, burns, or is fixed,
By rotating the scraper, the scraper can be peeled off and removed, the decrease in the amount of incinerator supplied can be prevented, and the incinerator can be operated stably.

(2) Further, an incinerator supply nozzle for an incinerator, which has an incinerator supply passage extending in a tubular shape in the axial direction and is installed with the incinerator supply port at its tip facing the combustion chamber of the incinerator. The inside of the incinerator supply passage near the incinerator discharge port at the tip of the incinerator supply nozzle has a required width in the axial direction of the passage, and is rotatable around the axis of the passage, and
A scraper for peeling the adhered substance that is movable in the axial direction of the passage is provided.

With such a configuration, the scraper can be set back and positioned a predetermined distance rearward from the incinerator discharge port at the tip of the supply nozzle during normal operation, and is affected by a high temperature atmosphere and radiant heat. Can be reduced to prevent burning of the scraper itself and burning or sticking of the incinerated material to the scraper itself.In addition, burning or sticking of the incinerated material near the incinerator discharge port at the tip of the supply nozzle can cause burning. When the supply amount of the substance is reduced, the scraper can be moved from the retracted position to the position of the incineration discharge port at the tip while being rotated, so that the burn-in and the adhered substances can be reliably removed.

Furthermore, since the scraper can be retracted and positioned backward from the incinerator discharge port at the tip of the supply nozzle by a predetermined distance during the operation of the incinerator, the incinerator near the incinerator discharge port of the supply nozzle. The obstruction that may hinder the transfer of the incinerated matter is eliminated, and the incinerated matter is smoothly discharged from the incinerator discharge port.

(3) Further, in the configuration of (1) or (2), the scraper of the incinerator supply nozzle of the incinerator is at least 2 spaced apart in the circumferential direction of the incinerator supply passage.
An acute-angled blade is formed at each tip of each of the two scrapers, and the apex forming the acute angle of the acute-angled blade is formed at a position lagging and advancing with respect to the same rotation direction. The top of the blade is arranged close to the inner surface of the incinerator supply passage.

With this configuration, the above configuration (1)
In the incineration material supply nozzle, the sharp blade is formed at the tip of the scraper, so that the adhered material can be more reliably peeled off, and at least two scrapers can be rotated regardless of the rotation direction of the scraper. It is possible to peel off the adhered matter at the top of the acute-angled blade of one of the scrapers, so that the operation for peeling the adhered matter can be performed easily.

In addition to the above-described effects, the incinerator supply nozzle having the above-mentioned configuration (2) has, in addition to the above-described effects, a scraper, for example, at the tip of the screw shaft that is screwed to the fixing portion of the supply nozzle body. When installed, the so-called scraper is provided so as to be movable in the axial direction of the incinerator supply passage by the feed screw method, and the screw shaft is rotated to move the scraper in the axial direction of the incinerator supply passage. Since it can be done while rotating, it is possible to rotate the scraper to the right while the scraper is in the retracted position and move it forward toward the incineration material discharge port at the tip and perform the peeling operation of the adhered matter with one scraper, After that, while rotating the scraper to the left in the opposite direction this time to return the scraper to the retracted position, it becomes possible to peel off the adhered matter with the sharp-edged blade at the tip of the other scraper, Will be peeling operation near incinerated discharge port portion during reciprocating movement in the axial direction of the scraper is performed, exfoliation of adhering matter is reliably performed.

[0014]

1 is a longitudinal sectional view of an incineration material supply nozzle according to an embodiment of the present invention, and FIG. 2 is a front view taken along the line II of FIG. 1 from the handle side end surface in the axial direction of the supply nozzle. As seen, FIG. 3 is an enlarged vertical cross-sectional view of the tip of the incinerator supply nozzle of FIG. 1 near the incinerator discharge port, and FIG. 4 is a front view taken along the line IV of FIG. It is the figure which looked at the thing discharge port from the shaft end.

In FIG. 1, 10 is a fluidized bed incinerator as an incinerator, 11 is its furnace wall, 11a is a refractory material, 1
Reference numeral 1b is a cooling pipe forming a water cooling wall, 12 is a combustion chamber (inside the furnace), and 13 is a fluidized bed formed inside thereof. On the furnace wall 11 of the combustion chamber 12 of the fluidized bed incinerator 10, a cylindrical supply nozzle mounting cylinder 14 having a flange 14a at the tip penetrates the furnace wall 11 and tilts at a predetermined angle (θ) so that the furnace side becomes lower. The sludge supply nozzle 20 serving as an incinerator supply nozzle for supplying sludge as an incinerator to the mounting cylinder 14 is inclined at the same angle (θ) as the mounting cylinder 14 and the incineration product at the tip is attached. The sludge discharge port 41 as a discharge port faces the combustion chamber 12 of the incinerator 10, and its flange 23a
Is attached to the combustion chamber 12 of the incinerator 10 by being joined to the flange 14a of the mounting seat 14.

The sludge supply nozzle 20 is provided with a cylindrical tubular body 21 as a nozzle body, which is formed by extending a predetermined distance in the axial direction and has a sludge supply passage 40 as an incinerator supply passage formed therein. The tubular body 21 is divided at its approximately middle portion and integrally joined by flanges 21a and 21b. The front end opening of the cylindrical body 21 on the furnace side is a sludge discharge port 4
It becomes 1. Further, the end portion of the cylindrical body 21 on the anti-sludge discharge port side (handle 32 side) is sealed by a bearing boss 22b.
A sludge supply pipe 27 as an incinerator supply pipe having a flange attached to the upper end is connected and attached in the middle of the tubular body 21 on the anti-sludge discharge port side so as to be inclined in the flow direction of the passage of the tubular body 21. There is.

A space 26a is formed between the cylindrical body 21 and the cylindrical body 21 on the outer periphery of the cylindrical body 21 on the side of the sludge discharge port 41 to supply a pressurized fluid such as compressed steam or compressed air for dispersing sludge. A cylindrical jacket 23 is attached to the jacket 2.
As shown in detail in FIG. 4, a large number of pressurized fluid jets 25 are circumferentially arranged between the end of the No. 3 on the furnace side and the tip of the tubular body 21 forming the sludge discharge port 41. Conical member 2 provided
It is sealed with 4. A pressurized fluid supply pipe 26 is attached to the jacket 23. Although the pressurized fluid supply pipe 26 is shown in a state of extending downward in FIG. 1, it is shown as being rotated by 90 ° for the sake of explanation. Actually, it is extended horizontally as shown in FIG. Installed. A flange 23a joined to the flange 14a of the supply nozzle mounting cylinder 14 is attached to the outer peripheral portion of the jacket 23.

However, the scraper shaft 30 extending in the axial direction of the cylinder is provided so as to penetrate through the inside of the cylinder 21 forming the sludge supply passage 40. The scraper shaft 30 is rotatably provided around its axis. That is, the scraper shaft 30 is a bearing boss 22 fixed to the end of the cylindrical body 21 on the side of the anti-sludge discharge port.
b of the bracket b and a female screw integrally mounted on the bearing boss 22b and having a tip portion bent downward to be supported and rotatable by a female screw threaded on the bent portion 28a. It is provided in.

A male screw having a predetermined length is axially threaded on the outer periphery of a shaft portion 30a near the end of the scraper shaft 30 on the anti-sludge discharge port side, and the male screw folds the bracket 28. It is screwed into the internal thread of the bent portion 28a, and a handle 32 for rotating the scraper shaft 30 is attached to the end of the scraper shaft 30 outside the bent portion 28a of the bracket 28. Has been. Inside the bearing boss 22b, a gland packing 33 is interposed between the gland packing 33 and the outer peripheral portion of the scraper shaft 30, and the gland packing 33 is pressed by a gland retainer 34.

On the other hand, at the end of the scraper shaft 30 on the sludge discharge port side, as shown in detail in FIG.
The scraper 31 for peeling the adhered substance, which has a required width in the axial direction of the scraper shaft 30, that is, in the axial direction of the scraper shaft 30, is in the circumferential direction 1.
Two scrapers 31 are attached at 80-degree symmetrical positions, and an acute-angled blade 31a is formed at the tip of each scraper 31. As shown in detail in FIG. 4, the apex portions 31b of the acute-angled blades 31a of the two scrapers 31 are formed at positions on the lagging side and the advancing side with respect to the same rotation direction. The top 31b of the blade 31a is located close to the inner surface of the sludge supply passage 40.

Therefore, by rotating the handle 32, the scraper 31 can be rotated around the axis of the sludge supply passage 40 via the scraper shaft 30 and can be moved in the axial direction of the sludge supply passage 40. it can. In the state of FIG. 1, the scraper 31 is located closest to the sludge discharge port 41 of the sludge supply passage 40 (scraper 31
And the tip of the scraper shaft 30 is in the C position). From this state, when the handle 32 is viewed from the outer shaft end, that is, when the handle 32 is rotated counterclockwise in the state shown in FIG. The scraper 31 is rotated counterclockwise by the screwing action of the female screw of the bent portion 28a of the bracket 28 with the predetermined stroke S at the position shown by the chain line in FIG. The tip of the scraper shaft 30 can be moved to the O position).

The sludge supply nozzle 20 constructed in this way
The operation of will be described. During operation of the fluidized bed incinerator 10, high temperature fluidizing / combustion air is blown up from the air dispersion plate located below the fluidized bed in the combustion chamber 12 to fluidize a fluidized medium such as sand to form a fluidized bed 13. The temperature of the fluidized bed 13 and the temperature of the freeboard facing the discharge port at the tip of the supply nozzle 20 above the fluidized bed 13 are maintained at a predetermined high temperature of 750 to 800 ° C. Sludge as incinerated material is dispersed and supplied to the freeboard from the sludge supply nozzle 20, and then the fluidized bed 1
It is thrown into 3 and incinerated.

During operation of the sludge supply nozzle 20, the tip of the scraper 31 is normally set at a position (O) retracted from the discharge port 41 by a predetermined distance S, for example, 100 mm, as shown by a chain line in FIG. The sludge stored in the hopper to the sludge supply pipe 27 of the sludge supply nozzle 20 is pressure-fed through a transport pipe by a sludge supply pump such as a screw pump or a screw feeder, and further, the cylinder 21 of the nozzle body and the scraper shaft 30 It is pressure-fed and supplied to the annular sludge supply passage 40 between and is discharged from the discharge port 41 at the tip thereof. At this time, dispersion steam (steam) as pressurized fluid is supplied into the jacket 23 through the pressurized fluid supply pipe 26, and a large number of pressurized fluid ejection ports provided around the sludge discharge port 41. The steam is vigorously ejected from the sludge 25, and the sludge discharged from the sludge discharge port 41 is dispersed into the combustion chamber 12
Which is supplied to the inside and dispersedly supplied into the high temperature fluidized bed 13 for combustion.
To be incinerated.

During such sludge incineration operation, the tips of the scraper 31 and the scraper shaft 30 are moved backward a predetermined distance (S) from the position (C) of the sludge discharge port 41 at the tip of the sludge supply nozzle 20. Therefore, there is no obstacle near the sludge discharge port 41 of the sludge supply nozzle 20 that may hinder the transfer of sludge, which is an incineration product, and the sludge is smoothly discharged from the sludge discharge port 41. Also, the combustion chamber 1
The influence of the high temperature atmosphere of 2 and radiant heat is reduced, and the burning of the scraper 31 itself and the burning or sticking of the incinerated material to the scraper 31 itself are effectively prevented.

Then, during the sludge incineration operation by such an incinerator, the sludge discharge port 4 of the sludge supply nozzle 20.
If the sludge seizes or sticks to the inner surface of the sludge supply passage 40 in the vicinity of 1, the sludge supply amount decreases. At this time, when the handle 32 of the scraper shaft 30 is viewed from the outer shaft end thereof, that is, when the handle 32 is rotated clockwise in the state shown in FIG. 2, the two scraper shafts mounted at the symmetrical positions in the circumferential direction via the scraper shaft 30. While rotating 31 and 31 clockwise, the sludge discharge port 4 of the sludge supply nozzle 20 from the retracted position (O)
When the stroke S is advanced toward 1, the seizure of the sludge and the adhered matter are peeled and removed.

At this time, of the two scrapers 31, 31, the scraper 31 located on the upper side shown in FIG. 4, that is, the scrapers 31, 31 in FIG. On the other hand, the top portion 31b of the acute-angled blade 31a of the upper scraper 31, which is located on the side where the apex portion 31b forming the acute angle of the acute-angled blade 31a advances, more effectively seizes the sludge and removes adhered matter.

When this peeling action is completed, the handle 32 of the scraper shaft 30 is rotated counterclockwise in the state shown in FIG. 2, that is, in the state shown in FIG. When the two scrapers 31, 31 attached to the position are rotated counterclockwise while moving leftward from the forward position (C) toward the reverse position (O) toward the anti-sludge discharge port 41 side of the sludge supply nozzle 20, Also during this time, the seizure of the sludge and the adhered matter remaining during the forward movement are peeled and removed.

At this time, of the two scrapers 31, 31, the scraper 31 located on the lower side shown in FIG. 4, that is, the scrapers 31, 31 shown in FIG. On the other hand, the top portion 31b of the acute-angled blade 31a of the lower scraper 31, which is located on the side where the apex portion 31b forming the acute angle of the acute-angled blade 31a advances, more effectively performs the seizure or the peeling action of the adhered matter.

In this way, when the scrapers 31 and 31 move forward and backward, the scrapers 31 and 31 are rotated and moved in the axial direction (stroke S) so that the seizure of the sludge and the adhered matter are effectively peeled off to ensure the operation. To be removed. In this example, the sludge, which is incinerated, has a water content of about 85% and a calorific value of 5,30.
It has a high water content of 0 Kcal / Kg, a high calorific value, and a viscous sludge, and the burning of sludge becomes more remarkable as the calorific value is higher, but the burning is effectively and surely removed by such an action. It Such peeling work by rotating the handle can be performed even while the incinerator is in operation. Further, if such peeling work is performed regularly during operation, it is more effective for stable incineration operation of the incinerator. As described above, by moving the scraper 31 by the stroke S, it is possible to remove the sludge remaining and adhering to the sludge supply passage 40 in the meantime.

In the above embodiment, the handle 32 is rotated to rotate the scrapers 31, 31 and move in the axial direction. However, instead of the handle 32, the scraper shaft 30 is used.
It is also possible to attach a rotary drive source such as a small electric motor or hydraulic motor to the end of the scraper so as to automatically and periodically rotate the scrapers 31 and 31 and move the scrapers 31 in the axial direction.

In the above embodiments, the scrapers 31, 31 are provided so as to be movable in the axial direction of the sludge supply passage 40 (cylindrical body 21). For example, the male screw of the scraper shaft 30 and the bracket 28 are folded. The feed screw portion formed by the female screw of the bending portion 28a is configured as a simple bearing to form the scrapers 31, 3
1 may be rotatably provided while being positioned in the vicinity of the sludge discharge port 41 in the sludge supply passage 40 of the supply nozzle 20.

In this structure, as shown in FIG. 4, two scrapers are attached to form sharp-edged blades 31a at the tips of the scrapers 31, 31, respectively.
If the apex 31b forming the acute angle of a is formed on the lagging side and the advancing side with respect to the same rotation direction, the adhered matter can be more surely peeled off, and the scrapers 31, 31
No matter which rotation direction is rotated, the adhered matter can be peeled off at the top of the acute-angled blade of one of the two scrapers, and the operation for peeling the adhered matter can be easily performed.

In the above embodiment, the scraper 3
Although the numbers 1 and 31 are provided two in the circumferential direction, three or more or only one may be attached in some cases. This may be selected according to the property of the incineration product and the difference in the adhered state.

The shape of the blade at the tip of the scraper 31 is an acute-angled blade, but the shape of the blade is the shape when the sludge discharge port 41 is seen from the outside of the sludge discharge port 41 of the sludge supply nozzle 20, that is, The shape corresponding to FIG. 4 can be selected from various shapes such as a flat tip, a tip with a sharp central portion, and the like. It can be decided according to different situations.

In addition, although the case where the incineration product is sludge was shown in the above examples, the incineration products applied to the present invention include high water content wastes such as coffee meal, tea meal and beer barley meal,
Alternatively, it goes without saying that it may be an incinerated product obtained by mixing them with sludge.

[0036]

As is clear from the above description, the present invention has the following excellent effects.

According to the first aspect of the present invention, the scraper is rotated even if the incinerated matter such as sludge sticks to the inner surface of the incinerator discharge port of the incinerator supply passage, burns, or becomes stuck. As a result, it can be peeled off and removed, a decrease in the amount of incinerated material supplied can be prevented, and the incinerator can be operated stably.

In the second aspect of the present invention, during normal operation, the scraper can be set back at a predetermined distance from the incinerator discharge port at the tip of the supply nozzle, and the scraper can be positioned so as to be affected by a high temperature atmosphere or radiant heat. It is possible to prevent the burning of the scraper itself and the burning or sticking of the incinerated material to the scraper itself by reducing the amount. Further, when the incineration product burns or sticks near the incineration product discharge port at the tip of the supply nozzle and the supply amount of the incineration product decreases, the scraper is rotated from the retracted position to the incineration product discharge port position at the tip. Since it can be moved while moving, it is possible to reliably remove the seizure and the adhered matter.

Furthermore, since the scraper can be set back at a predetermined distance from the incinerator discharge port at the tip of the supply nozzle while the incinerator is in operation, the scraper can be located near the incinerator discharge port of the supply nozzle. Since there is no obstacle that may hinder the transfer of the incinerated material, the incinerated material can be smoothly discharged from the incinerator discharge port.

According to the third aspect of the invention, in the incinerator supply nozzle of the first aspect, since the sharp-edged blade is formed at the tip of the scraper, it is possible to more reliably remove the adhered matter. Since the fixed matter can be peeled off at the top of the acute-angled blade of at least one of the at least two scrapers, the peeling operation of the fixed matter can be easily performed no matter which rotation direction the scraper is rotated. .

Further, in the incinerator supply nozzle according to the second aspect, in addition to the above-described function and effect, a scraper is attached to, for example, a tip end portion of a screw shaft screwed to a fixing portion of the supply nozzle body. In the case where the so-called scraper is provided so as to be movable in the axial direction of the incinerator supply passage by a feed screw method, the screw shaft is rotated to rotate the scraper in the axial direction of the incinerator supply passage. Since the scraper is in the retracted position, rotate the scraper to the right and move it forward toward the incinerator discharge port at the tip, and remove scraps with one scraper. After that, it is possible to rotate the scraper to the left in the opposite direction this time and return the scraper to the retracted position while peeling the adhered matter with the sharp blade of the tip of the other scraper. There, it is possible to perform the peeling operation in the vicinity of the material to be incinerated discharge port portion in the axial direction of the reciprocating movement of the scraper, the exfoliation of the solid deposits can be more reliably.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a sludge supply nozzle according to an embodiment of the present invention.

FIG. 2 is a front view taken along the line II in FIG. 1 and is a view seen from an end surface on the handle side in the axial direction of the supply nozzle.

FIG. 3 is an enlarged vertical cross-sectional view of the vicinity of an incinerator discharge port at the tip of the sludge supply nozzle of FIG.

FIG. 4 is a front view taken along the line IV of FIG. 3 and is a view of the sludge discharge port at the tip of the sludge supply nozzle as seen from the shaft end.

[Explanation of symbols]

 10 Fluidized Bed Incinerator 12 Combustion Chamber 13 Fluidized Bed 14 Incinerator Supply Nozzle Mounting Seat 20 Sludge (Incinerator) Supply Nozzle 21 Cylinder (Supply Nozzle Main Body) 23 Jacket 25 Steam (Pressurized Fluid) Jet 26 Steam (Pressurized) Fluid) Supply pipe 27 Sludge (incineration) supply pipe 30 Scraper shaft 30a Male screw forming part 31 Scraper 31a Sharp blade 31b Sharp blade top 32 Handle 40 Sludge (incineration) supply passage 41 Sludge (incineration) discharge port S scraper Travel distance (stroke) C Scraper forward limit tip position O Scraper backward limit tip position

Claims (3)

[Claims] 1. An incinerator supply nozzle for an incinerator, which has an incinerator supply passage extending in a tubular shape in the axial direction, and which is attached with the incinerator discharge port at its tip facing the combustion chamber of the incinerator. , Inside the incinerator supply passage near the incinerator discharge port at the tip of the incinerator supply nozzle, having a required width in the axial direction of the passage, and separating the adhered matter rotatable about the axis of the passage. An incinerator supply nozzle for an incinerator, characterized by being provided with a scraper for use. 2. An incinerator supply nozzle for an incinerator, which has an incinerator supply passage extending in a tubular shape in the axial direction, and which is attached with the incinerator discharge port at its tip facing the combustion chamber of the incinerator. , Inside the incinerator supply passage near the incinerator discharge port at the tip of the incinerator supply nozzle, having a required width in the axial direction of the passage, rotatable about the axis of the passage, and An incinerator supply nozzle for an incinerator, which is provided with a scraper that can move in the axial direction and that removes adhered substances. 3. At least two scrapers of the incinerator supply nozzle of the incinerator are provided at intervals in the circumferential direction of the incinerator supply passage, and each of the two scrapers is provided with an acute angle blade, The apex forming the acute angle of the acute-angled blade is formed at a position on the lagging side and the advancing side with respect to the same rotation direction, and the apex of the acute-angled blade is provided so as to be located close to the inner surface of the incinerator supply passage. Claim 1 or 2 characterized by the above.
Incinerator supply nozzle of the incinerator.