TWI715981B - Support sleeve protection member and solid fuel burner provided with the same - Google Patents

Abstract

The support sleeve protection member (42) covers the outer circumference of the support sleeve (32) to protect it from the conflict between the solid fuel and the support sleeve (32). The support sleeve (32) and the mixed fluid of solid fuel and air are sprayed out The fuel nozzle (21) is located coaxially and arranged on the inner side in the radial direction, and is characterized in that it is arranged in an area corresponding to the curved portion (21b) on the way of the mixed fluid conveying path of the fuel nozzle (21), and is formed to be able to The support sleeve (32) is attached to and detached from the cylindrical shape, and the support sleeve protection member (42) is compared with the structure in which the protection member and the conflict plate are integrally exchanged, which can reduce the waste of parts and cost during exchange .

Description

Support sleeve protection member and solid fuel burner provided with the same

The present invention relates to a protective member of a support sleeve that supports components such as an oil burner or a fuel concentrator provided in a fuel nozzle of a solid fuel burner, and a solid fuel burner provided with the same.

Regarding solid fuel burners used in boilers used in thermal power plants and the like, the techniques described in Patent Documents 1-7 below are known in the past.

Patent Document 1 (U.S. Patent No. 6474250) describes that in the burner nozzle (10), a mixed flow of coal and primary air is supplied to the nozzle from the supply port (50), and at the supply port (50) The confluence part of) is provided with a sleeve (88) that protects the pipe (86) passing through the center of the nozzle from melting.

Patent Document 2 (Korean Patent Publication No. 2002-0024430) describes that in a solid fuel burner, the bent pipe portion of the path through which the solid fuel is supplied is on the outer circumference of the fuel burner (500) The structure of the cylindrical member (900) is supported. Patent Document 2 describes that the cylindrical member (900) has a streamlined structure with a downwardly tapered cross section, and guides the fluid containing coal powder from below from the oil burner (500) to the outside.

In Patent Document 3 (Japanese Patent No. 3986182), Patent Document 4 (Japanese Patent No. 3344694), Patent Document 5 (Japanese Patent No. 3643461), Patent Document 6 (Japanese Patent Laid-Open No. 9-318014) , Patent Document 7 (Japanese Patent No. 3099109) describes that in a pulverized coal combustion burner, a pulverized coal nozzle (fuel nozzle) is penetrated to assist combustion at the start of the burner or during low-load combustion. Examples of oil guns (oil burners).

Here, it is not limited to all solid fuel burners having this oil gun (oil burner). However, inside the solid fuel burner, a member (not shown) supporting members such as a fuel concentrator (obstacle 32 in Patent Document 3) and the like is arranged. In addition, there are cases where a member (not shown) that supports the oil gun on the outer peripheral side is provided. The outer cylinder member of the oil gun, the member that supports the oil gun, or the member that supports the fuel concentrator is called a support sleeve and is formed in a long cylindrical shape extending to the vicinity of the opening of the pulverized coal nozzle (fuel nozzle).

On the other hand, Patent Documents 3-7 describe that the elbow (shoulder-shaped bend) portion on the upstream side of the pulverized coal nozzle is provided with a short cylindrical tube covering the outer circumference of the oil gun (oil burner). The structure of the member is the one provided on the outer periphery of the aforementioned support sleeve.

[Prior Technical Literature] [Patent Literature]

[Patent Document 1] US Patent No. 6474250 (column 3, line 12-line 53, Figure 1)

[Patent Document 2] Korean Patent Publication No. 2002-0024430 (Figure 3, (Figure 6-Figure 9)

[Patent Document 3] Japanese Patent No. 3986182 (Figure 1, Figure 3, Figure 7, Figure 8)

[Patent Document 4] Japanese Patent No. 3344694 (Figure 1, Figure 3, Figure 8-Figure 10)

[Patent Document 5] Japanese Patent No. 3643461 (Figure 1, Figure 3-Figure 7, Figure 9, Figure 10)

[Patent Document 6] Japanese Patent Application Laid-Open No. 9-318014 (Figure 1-Figure 4, Figure 7, Figure 8)

[Patent Document 7] Japanese Patent No. 3099109 (Figure 1, Figure 3, Figure 4, Figure 7)

In the conventional solid fuel burner, the supplied solid fuel flows in the direction of the elbow that conflicts with the support sleeve from the radial direction. As a result, the solid fuel conflicts with the support sleeve, and there is a problem of gradual wear on the surface. The wear and tear of the support sleeve may cause a fire due to the intrusion and accumulation of coal powder into the sleeve. In addition, if an oil burner is installed inside, there is a possibility of fire due to oil leakage due to the wear of the oil burner. Therefore, it is necessary to protect the support sleeve and the oil burner from Wear. Therefore, as described in Patent Documents 1-7, conventionally, a cylindrical member (protection tube) is provided to protect the support sleeve and the oil burner from wear.

However, in this structure, although the solid fuel does not directly collide with the support sleeve, the solid fuel collides with the protective cylinder, so the protective cylinder will gradually wear out. In particular, the wear on the upstream surface (the lower surface in each figure) where the solid fuel is likely to directly collide is significant. Then, as described in Patent Document 2, so that the lower surface wear allowance (abrasion allowance) becomes larger, the lower surface side has a thicker (sharpened) shape.

Fig. 8 is an explanatory diagram of an example of a protection tube of a conventional elbow section, Fig. 8(A) is a cross-sectional view of the main part, and Fig. 8(B) is a perspective view.

In the structure described in Patent Documents 1-7, the protective tube is a structure that penetrates the nozzle and is fixed. In the conventional example shown in FIG. 8, the protective tube 01 is formed in a semicircle through the flange 02 of the inclined portion of the elbow. The shaped conflict plate 03 becomes an integral casting product.

Here, the progress of abrasion differs in the length direction of the protective cylinder, and there are also cases where it has been found to be particularly locally eroded in a specific narrow area.

In this case, it is not economical to exchange all the non-wearing conflict plates with the protective cylinder as a whole, so there is also a paste-like wear-resistant coating and covering only on the worn and corroded parts of the protective cylinder. Emergency repair of consumables and hardening them. However, the material of the protective cylinder itself is wear-resistant steel. This kind of paste-like wear-resistant material cannot be fixed by bolts or other welding fixation. Therefore, due to wear and tear in use, it has this wear-resistant material. The problem of easy peeling.

The technical problem of the present invention is that compared with the structure in which the support sleeve protection member and the conflict plate are integrally exchanged, there is no exchange time. The waste of parts can suppress the number of exchanges.

In order to solve the aforementioned technical problems, the support sleeve protection member of the invention described in claim 1 covers the outer periphery of the support sleeve to protect the support sleeve from the conflict between the solid fuel and the support sleeve. The fuel nozzle for ejecting the mixed fluid of solid fuel and air is coaxially arranged on the inner side in the radial direction, and the support sleeve protection member is characterized by being arranged at the curved portion of the fuel nozzle and the mixed fluid conveying path. The corresponding area is formed in a cylindrical shape that can be removed from the support sleeve, and the collision protection member on the inner surface of the fuel nozzle for protecting the area where the solid fuel collides is a separate structure, along the axis of the support sleeve The cross section in the direction is formed in a point-symmetrical shape with the center part in the axial direction as the center.

In order to solve the aforementioned technical problems, the invention described in claim 2 is to cover the outer periphery of the aforementioned support sleeve to protect the support sleeve from the conflict between the solid fuel and the aforementioned support sleeve. The fuel nozzle through which the mixed fluid is ejected is coaxially arranged on the inner side in the radial direction, and the support sleeve protection member is characterized in that it is arranged in the area corresponding to the curved portion of the fuel nozzle in the middle of the conveying path of the mixed fluid, It is formed in a cylindrical shape that can be detached from the support, and the collision protection member used to protect the area where the solid fuel collides on the inner surface of the fuel nozzle has a separate structure, and has an inclined portion formed in the axial direction. The end portion is formed in a shape along the inner surface of the curved portion of the fuel nozzle, and has a rotation stop function for contacting the inner surface of the curved portion to restrain the support sleeve from rotating in the circumferential direction.

In order to solve the aforementioned technical problems, the solid fuel burner of the invention described in claim 3 is characterized by comprising: a cylindrical fuel nozzle that ejects a mixed fluid of solid fuel and air, and the mixed fluid The conveying path is provided with a curved part on the way; a support sleeve, which is closer to the downstream side of the flow direction of the mixed fluid than the aforementioned curved part, is coaxial with the aforementioned fuel nozzle and arranged on the inner side of the radial direction; the support sleeve protection member, It is arranged in a region corresponding to the aforementioned curved portion, and is formed into a cylindrical shape that covers the outer periphery of the support sleeve and can be removed from the support sleeve to protect from the collision of the solid fuel against the support sleeve. The support sleeve protection member The conflict protection member used to protect the area conflicted by the solid fuel on the inner surface of the fuel nozzle is a separate structure; the conflict protection member has: the inner surface of the fuel nozzle is used to protect the area conflicted by the solid fuel The conflict protection part, the cylindrical part covering the outer circumference of the support sleeve; and the support sleeve protection member, which is installed in the conflict protection member The outer circumference of the aforementioned cylinder.

The invention described in claim 4 is the solid fuel burner described in claim 3, which is characterized by comprising: a positioning portion formed at a position corresponding to an end portion of the support sleeve protection member in the axial direction, and The end of the aforementioned support sleeve protects the member to contact for positioning.

According to the inventions described in claims 1 and 3, compared with the structure in which the support cover protection member and the collision plate are integrally exchanged, there is no waste of parts during exchange, and the number of exchanges can be suppressed. Furthermore, according to the inventions described in claims 1 and 3, it is easier to determine the exchange time compared with the case where the support sleeve protection member and the conflict protection member are integrated.

In addition, according to the invention described in claim 1, the support cover protection member can be temporarily removed, and it can be installed by rotating it around the symmetry point. Therefore, when one surface side of the support sleeve protection member is worn, it is rotated around the point of symmetry, thereby making the opposite side face the side where the wear is more pronounced. Therefore, the life of the support sleeve protection member can be prolonged in comparison with a structure that cannot be rotated.

Furthermore, according to the invention described in claim 2, in comparison with the case where the anti-rotation function is not provided, rotation of the support sleeve protection member due to collision of solid fuel and vibration during operation can be suppressed.

Furthermore, according to the invention described in claim 3, the support sleeve protection member and the other conflict protection members have separate structures, and the support sleeves can be exchanged separately The protection component conflicts with other protection components. Therefore, compared with a structure in which other conflict protection members are exchanged when the support sleeve protection member is exchanged, the waste of parts can be reduced and the cost can be suppressed.

According to the invention described in claim 4, compared with the case where the positioning portion is not provided, the positional displacement of the support cover protection member can be suppressed, and it is possible to minimize the fixing parts.

7: Solid fuel burner

21: Fuel nozzle

21b: curved part

24: Conveyor Road

32: Support sleeve

41: Conflict protection component

41a: conflict plate flange

41b: Tube

41c: Conflict Protection Department

41d, 41e: positioning part

42: Support sleeve protection member

42a: anti-rotation part

42b: Central

Fig. 1 is an explanatory diagram of a solid fuel burner of the first embodiment.

Fig. 2 is an enlarged explanatory view of the elbow part of the first embodiment.

Fig. 3 is an explanatory view of the support sleeve protection member of Example 1, Fig. 3(A) is a cross-sectional view along the axial direction, and Fig. 3(B) is a view seen from the arrow IIIB direction of Fig. 3(A).

Fig. 4 is an explanatory view of the function of the support sleeve protection member of the first embodiment, Fig. 4(A) is an explanatory view of the wear state of the underside of the support sleeve protection member, and Fig. 4(B) is a view from the state of Fig. 4(A) An explanatory diagram of the state where the support sleeve protection member rotates around the symmetry point.

Fig. 5 is an explanatory diagram of Modification 1 of Example 1, Fig. 5(A) is a diagram corresponding to Fig. 3(A), and Fig. 5(B) is a cross-sectional view taken along the line VB-VB of Fig. 5(A).

6 is an explanatory diagram of Modification Examples 2 and 3, FIG. 6(A) is an explanatory diagram of Modification Example 2, and FIG. 6(B) is an explanatory diagram of Modification Example 3.

FIG. 7 is an explanatory diagram of Modification 4, and is a diagram corresponding to FIG. 2 of Embodiment 1. FIG.

Fig. 8 is an explanatory diagram of an example of a protection tube of a conventional elbow section, Fig. 8(A) is a cross-sectional view of the main part, and Fig. 8(B) is a perspective view.

Next, examples which are specific examples of embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples.

In addition, in the description using the following drawings, for ease of understanding, illustrations other than the members that must be described are appropriately omitted.

[Example 1]

Fig. 1 is an explanatory diagram of a solid fuel burner of the first embodiment.

In FIG. 1, the solid fuel burner 7 of Embodiment 1 has a fuel nozzle 21 for flowing transportation gas and solid fuel. The opening at the downstream end of the fuel nozzle 21 is provided on the wall surface (furnace wall, water pipe wall) 23 of the furnace 22 of the boiler. The fuel nozzle 21 connects the fuel pipe 8 to the upstream end. The fuel nozzle 21 is formed in a hollow cylindrical shape. Inside the fuel nozzle 21, a flow path 24 for flowing solid fuel (pulverized coal or pulverized biomass fuel) and transport gas is formed.

The fuel nozzle 21 of Example 1 has: a main body portion 21a of the fuel nozzle 21 extending perpendicularly to the wall surface 23 of the furnace 22, and a bend that is bent downward from the upstream side of the main body portion 21a of the fuel nozzle 21 and connected to the fuel pipe 8. Tube portion (bent portion) 21b. Therefore, when the fluid containing solid fuel and transport gas supplied from the fuel pipe 8 flows into the main body portion 21a through the elbow portion 21b, it flows outward in the radial direction of the main body portion 21a due to inertia Offset.

On the outer periphery of the fuel nozzle 21, an air nozzle for combustion (air nozzle for secondary combustion) 26 that blows combustion air to the inside of the furnace 22 is provided. In addition, on the outer peripheral side of the inner combustion air nozzle 26, an outer combustion air nozzle (tertiary combustion air nozzle) 27 is provided. Each of the combustion air nozzles 26 and 27 sprays air from a wind box 28 into the furnace 22. In the first embodiment, at the downstream end of the inner combustion air nozzle 26, a guide vane 26a is formed that is inclined radially outward from the center of the fuel nozzle 21 (the diameter increases toward the downstream side). In addition, at the downstream portion of the outer combustion air nozzle 27, a throat portion 27a along the axial direction and an enlarged portion 27b parallel to the guide vane 26a are formed. Then, the combustion air ejected from each of the combustion air nozzles 26 and 27 is ejected so as to diffuse from the center in the axial direction.

In the above description, although terms such as combustion air are used, it is not strictly limited to only air, nor does it prevent the use of mixed gas such as air and combustion exhaust gas or oxygen.

At the opening at the downstream end of the fuel nozzle 21, a combustion stabilizer 31 is supported.

At the center of the cross section of the flow path of the fuel nozzle 21, a support sleeve (fuel burner, diffuser) 32 is arranged through it. The support sleeve 32 is supported by penetrating the elbow portion 21b.

A venturi 33 is provided on the inner wall surface of the fuel nozzle 21. The venturi 33 is formed in a shape that expands after narrowing the inner diameter of the fuel nozzle 21 along the flow direction of the solid fuel from the upstream side to the downstream side. shape.

Therefore, in the venturi 33 of the first embodiment, the mixed fluid of the fuel and the transport gas supplied to the fuel nozzle 21 is constricted toward the inner side in the radial direction when passing through the area where the inner diameter is reduced. Thus, the fuel deviated near the inner wall surface of the main body portion 21a of the fuel nozzle 21 can be moved toward the center side.

On the downstream side of the venturi 33, the fuel concentrator 34 is provided on the outer surface of the support sleeve 32. The fuel concentrator 34 is formed in a shape in which the outer shape of the fuel concentrator 34 is enlarged and reduced from the upstream side to the downstream side along the flow direction of the solid fuel.

Therefore, in the fuel concentrator 34 of the first embodiment, when the mixed fluid of the fuel and the transport gas passes through the area where the outer shape is enlarged, a velocity component toward the outer side in the radial direction is given. Thereby, the fuel is concentrated toward the inner wall surface of the fuel nozzle 21.

In addition, the present invention can also be applied to a burner without the fuel concentrator 34.

Fig. 2 is an enlarged explanatory view of the elbow part of the first embodiment.

In FIGS. 1 and 2, the solid fuel burner 7 of Embodiment 1 supports the collision protection member 41 on the support sleeve 32. The collision protection member 41 has a collision plate flange (collision plate mounting portion) 41a that is detachably fixed by a bolt or the like not shown in the elbow portion 21b. The collision plate flange 41a is integrally formed with a cylindrical portion 41b through which the support sleeve 32 penetrates. On the outer peripheral side of the cylinder portion 41b, the protection cylinder 42 is provided as a separate member from the support sleeve 32 and the conflict protection member 41.

And, on the upper part of the collision plate flange 41a, in order to protect the inner surface above the elbow part 21b, there is formed as an example of a collision protection part Conflict board 41c. The collision plate 41c is formed in a semi-cylindrical shape with a downward opening similarly to the conventional structure.

In addition, on the collision plate flange 41a, a positioning ring 41d as an example of a positioning portion of the protective tube 42 is integrally formed on the outer peripheral side of the tube portion 41b.

Fig. 3 is an explanatory view of the support sleeve protection member of Example 1, Fig. 3(A) is a cross-sectional view along the axial direction, and Fig. 3(B) is a view seen from the arrow IIIB direction of Fig. 3(A).

A protection cylinder 42 as an example of a support sleeve protection member is arranged on the outer periphery of the cylinder portion 41b. The protective cylinder 42 is formed in a cylindrical shape extending along the axial direction of the support sleeve 32. In FIG. 3(A), the protective cylinder 42 of Example 1 is formed in a parallelogram shape in a cross-sectional view along the axial direction. Thereby, the protective cylinder 42 of Example 1 is formed in the shape of point symmetry centering on the symmetry point 42b of the central part in the axial direction.

At both ends of the protective cylinder 42 in the axial direction, inclined surfaces 42a are formed as an example of a rotation stop part. The inclined surface 42a is formed in a shape along the inner surface of the elbow portion 21b (or the opposite collision plate flange 41a).

In addition, the outer diameter of the protective tube 42 is formed to a size that can fit between the tube portion 41b and the positioning ring 41d when the end of the protective tube 42 abuts against the collision plate flange 41a.

Between the protection tube 42 and the tube portion 41b of the first embodiment, an O ring 43 is attached. Therefore, the protective tube 42 is difficult to move in the axial direction due to the frictional force of the O ring 43 in the installed state.

(Function of Example 1)

In the solid fuel burner 7 of the first embodiment with the aforementioned structure, even if the solid fuel supplied from the fuel pipe 8 tries to collide with the support sleeve 32 at the elbow portion 21b, it is protected by the protection tube 42. Thus, the wear of the support sleeve 32 is prevented.

Here, the protective tube 42 of Example 1 is different from the conventional structure, and has a structure independent of the collision plate flange 41a or the collision plate 41c (a separate structure). Therefore, when the protective cylinder 42 is worn out due to the collision of the solid fuel, only the protective cylinder 42 can be easily removed and exchanged. Therefore, in comparison with the structure in which the collision plate 41c and the like are integrally exchanged for the protective cylinder 42 of the first embodiment, it is possible to suppress the waste of replacing parts (the collision plate 41c and the like) that do not need to be exchanged or wasteful cost.

Fig. 4 is an explanatory view of the function of the support sleeve protection member of Embodiment 1, Fig. 4(A) is an explanatory view of the state where the support sleeve protection member wears down due to the conflict of solid fuel, and Fig. 4(B) is from Fig. 4 The state of (A) is an explanatory diagram of a state in which the support cover protection member is rotated around the point of symmetry.

In Figs. 3 and 4, the protective cylinder 42 of the first embodiment is formed in a parallelogram shape with a point symmetry centered on the symmetry point 42b. Then, as shown in FIG. 4, when the lower part on the upstream side of the solid fuel conveying direction is worn, the protective cylinder 42 is removed from the support sleeve 32, and the protective cylinder 42 is rotated and installed around the symmetry point 42b. By making the wear area 51 upward, the surface with almost no wear can be placed on the underside where wear is significant. Therefore, even when the protective cylinder 42 is worn, it can be rotated around the symmetrical point 42b and reinstalled, so that the protective cylinder 42 can be reused even if it is not exchanged. Therefore, the life of the protection cylinder 42 can be extended, and the cost of parts and maintenance can be reduced. cost.

Moreover, in the first embodiment, the support sleeve 32 is protected by the conflict protection member 41 or the protection tube 42. Therefore, the conflict protection member 41 or the protection cylinder 42 is made of abrasion-resistant steel, and the support sleeve 32 can also be made of low-cost components such as the protection cylinder 42. In this way, the overall cost of the solid fuel burner 7 can be reduced.

In addition, the support sleeve 32 is double-protected by the cylindrical part 41b of the collision protection member 41 and the protection tube 42 which is a member independent of the cylindrical part. Thereby, it is easy to determine the time of the wear and wear of the support sleeve protection member, exchange or repair. That is, the protection cylinder 42 is easier to remove from the burner than the conflict protection member 41, so it has the advantage that it can be removed to measure its wear and abrasion during regular inspections. Moreover, even if the wear and abrasion amount of the protection cylinder 42 are not measured at every periodic inspection, the operation of the replacement or repair time can be judged based on the opening (penetration) of the protection cylinder 42.

In addition, in Example 1, the inclined surface 42a of the end abuts against the collision plate flange 41a. Accordingly, even if the protection cylinder 42 is about to rotate in the circumferential direction due to the collision of the solid fuel with the protection cylinder 42, the inclined inclined surface 42a will interfere with the collision plate flange 41a. Therefore, the rotation of the protection cylinder 42 is restricted. Therefore, the situation where the protective cylinder 42 is rotated to change the position is restricted.

In addition, in the first embodiment, the O-ring 43 is used to restrict the movement of the protective cylinder 42 in the axial direction. Therefore, the position of the protection cylinder 42 in the axial direction is stabilized, and the rotation of the protection cylinder 42 due to the collision of the solid fuel can be restricted compared with the case where the movement in the axial direction is not restricted.

(Explanation of the change example) (Change example 1)

Fig. 5 is an explanatory diagram of Modification 1 of Example 1, Fig. 5(A) is a diagram corresponding to Fig. 3(A), and Fig. 5(B) is a cross-sectional view taken along the line VB-VB of Fig. 5(A).

In FIG. 5, the structure of the embodiment 1 shown in FIG. 3 may be changed, and the thick portion 42c may be formed centering on the portion where the wear is significant. As shown in FIG. 5, when the thick-walled portion 42c is provided, a sufficient wear margin can be provided in the portion where the wear is significant due to the collision of the solid fuel. Therefore, the life of the protection cylinder 42 can be further extended.

(Changes 2 and 3)

6 is an explanatory diagram of Modification Examples 2 and 3, FIG. 6(A) is an explanatory diagram of Modification Example 2, and FIG. 6(B) is an explanatory diagram of Modification Example 3.

Fig. 6 is not limited to the form shown in Fig. 5(B). As shown in Fig. 6(A), it is provided in a shape that guides the fluid containing solid fuel sent from below to the outside (rectifying shape). ) 42d, thereby making it difficult for the solid fuel to contact the protective cylinder 42 from the front, and it can be expected to reduce the force received by the protective cylinder 42.

And, as shown in FIG. 6(B), it may be streamlined.

(Change example 4)

FIG. 7 is an explanatory diagram of Modification 4, and is a diagram corresponding to FIG. 2 of Embodiment 1. FIG.

In the first embodiment shown in FIG. 2, although the conflict protection member 41 is shown as an example The positioning ring 41d is used as an example of the structure of the positioning portion, but it is not limited to this. For example, as shown in FIG. 7, the structure which forms the positioning recessed part 41e as an example of a positioning part may be sufficient.

Moreover, the structure provided with both the positioning ring 41d of FIG. 2 and the positioning recessed part 41e of FIG. 7 may be sufficient.

In addition, since the rotation is stopped by the collision protection member 41 (collision plate flange 41a) and the inclined surface of the protection tube 42, and the movement in the axial direction is also restricted by friction due to the weight of the protection tube 42, it is The structure which does not provide positioning part 41d, 41e is also possible.

(Change example)

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the foregoing embodiments, and various changes can be made within the scope of the gist of the present invention described in the scope of the patent application. Examples of modified examples (H01) to (H05) of the present invention are as follows.

(H01) In the foregoing embodiment, the shape of the protective cylinder 42 is preferably a point-symmetrical shape, but it is not limited to this. It may be an asymmetrical shape or a line-symmetrical shape. In addition, the point symmetry shape is not limited to a parallelogram shape in cross section, and may be any shape such as a rhombus or hexagonal shape in cross section.

(H02) In the foregoing embodiment, the case where the thick-walled portions 42c and 42d are provided is not limited to the exemplified shape, and may be any shape.

(H03) In the foregoing embodiment, although the rotation stop portion composed of the inclined surface 42a is exemplified, it is not limited to this. Any anti-rotation structure such as the shape of the key and the keyway can be adopted. And, although it is better to have a rotation stop, it is The structure without installation is also possible.

(H04) In the foregoing embodiment, although the positioning portions 41d and 41e are exemplified, the structure may not be provided. In addition, the shapes of the positioning portions 41d and 41e are not limited to the illustrated shapes, and may be changed to any positioning shapes such as a fitting claw shape and a screw locking shape.

(H05) In the foregoing embodiment, although the O-ring 43 is used to prevent the protective cylinder 42 from moving in the axial direction, the structure is not limited to this. For example, it is also possible to use clamps, bolts, or flexible elastic materials.

7: Solid fuel burner

8: Fuel piping

21: Fuel nozzle

21a: body part

21b: curved part

22: Stove

23: Wall

24: Conveyor Road

26: Air nozzle for combustion

26a: Guide vane

27: Air nozzle for outer combustion

27a: Throat

27b: Expansion Department

28: Bellows

31: Combustion stabilizer

32: Support sleeve

33: Venturi

34: Fuel Concentrator

Claims (4)

A support sleeve protection member covers the outer periphery of the support sleeve to protect the support sleeve from the conflict of the solid fuel on the support sleeve. The support sleeve and the fuel nozzle that sprays the mixed fluid of solid fuel and air are located at Coaxially and arranged on the inner side in the radial direction, the support sleeve protection member is characterized in that it is arranged in the area corresponding to the curved portion of the fuel nozzle in the middle of the conveying path of the mixed fluid, and is formed as a cylinder that can be detached from the support sleeve It is a separate structure from the collision protection member used to protect the area where the solid fuel collides on the inner surface of the fuel nozzle. The cross section along the axis of the support sleeve is formed with the central part in the axis direction as Point-symmetrical shape at the center. A support sleeve protection member covers the outer periphery of the support sleeve to protect the support sleeve from the conflict of the solid fuel on the support sleeve. The support sleeve and the fuel nozzle that sprays the mixed fluid of solid fuel and air are located at Coaxially and arranged on the inner side in the radial direction, the support sleeve protection member is characterized in that it is arranged in the area corresponding to the curved portion of the fuel nozzle in the middle of the conveying path of the mixed fluid, and is formed as a cylinder that can be detached from the support sleeve , Which conflicts with the solid fuel used to protect the inner surface of the aforementioned fuel nozzle The collision protection member of the area has a separate structure, and has an inclined portion formed at the end of the aforementioned axial direction, and is formed in a shape along the inner surface of the curved portion of the fuel nozzle, and has an inner surface of the curved portion. Surface contact prevents the aforementioned support sleeve from rotating in the circumferential direction. A solid fuel burner, characterized by comprising: a cylindrical fuel nozzle that sprays a mixed fluid of solid fuel and air, and a curved part is provided in the middle of the conveying path of the mixed fluid; a support sleeve, It is on the downstream side of the flow direction of the mixed fluid than the curved portion, and is coaxial with the fuel nozzle and arranged on the inner side in the radial direction; the support sleeve protection member is arranged in the area corresponding to the curved portion and covers the support The outer circumference of the sleeve is formed into a cylindrical shape that can be removed from the support sleeve to protect from the conflict between the solid fuel and the support sleeve. The support sleeve protection member is used to protect the solid fuel on the inner surface of the fuel nozzle. The conflict protection member in the conflict area has a separate structure; the conflict protection member has: a conflict protection portion for protecting the area where the solid fuel collides on the inner surface of the fuel nozzle, and a cylindrical portion covering the outer circumference of the support sleeve And the aforementioned support sleeve protection member, which is installed on the outer circumference of the aforementioned cylindrical portion of the aforementioned conflict protection member. The solid fuel burner according to claim 3, comprising: a positioning portion formed at a position corresponding to an end portion of the support sleeve protection member in the axial direction and contacted with the end portion of the support sleeve protection member Positioning.

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