KR102266012B1 - Support sleeve protection member and solid fuel burner having same - Google Patents

Abstract

The support sleeve 32 of the solid fuel covers the outer periphery of the support sleeve 32 with respect to the support sleeve 32 disposed coaxially and radially inside the fuel nozzle 21 for ejecting a mixed fluid of solid fuel and air. A support sleeve protection member (42) for protecting against collision with the furnace, which is disposed in a region corresponding to the bent portion (21b) in the middle of the conveying path of the mixed fluid in the fuel nozzle (21), By the support sleeve protection member 42 characterized in that it is formed in a detachable cylindrical shape, the waste of parts and waste of cost at the time of replacement is suppressed compared with the structure which replaces the protection member integrally with a collision plate.

Description

Support sleeve protection member and solid fuel burner having same

The present invention relates to a protective member of a support sleeve for supporting members such as an oil burner and a fuel concentrator provided in a fuel nozzle of a solid fuel burner, and a solid fuel burner having the same.

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

In Patent Document 1 (U.S. Patent No. 6,474,250), in the burner nozzle 10, a mixed flow of coal and primary air is supplied from the supply port 50 to the nozzle, and at the merging portion of the supply port 50, , a configuration in which a sleeve 88 is provided to protect the tube 86 passing through the central portion of the nozzle from ablation is described.

In Patent Document 2 (Korean Patent Application Laid-Open No. 2002-0024430), in the solid fuel burner, in the elbow portion bent in the path to which the solid fuel is supplied, a cylindrical member 900 is formed on the outer periphery of the oil burner 500 . ) is described as a supported configuration. Patent Document 2 describes a configuration in which the tubular member 900 is formed in a streamlined shape with a pointed downward cross section so that the fluid containing the pulverized coal from below is guided outward from the oil burner 500 .

Patent Literature 3 (Japanese Patent No. 3986182), Patent Literature 4 (Japanese Patent No. 3344694), Patent Literature 5 (Japanese Patent No. 3643461), Patent Literature 6 (Japanese Patent Laid-Open No. 9-318014) ), Patent Document 7 (Japanese Patent No. 3099109), in a pulverized coal combustion burner, penetrates a pulverized coal nozzle (fuel nozzle) and provides an oil gun (oil burner) for supporting smoke during burner startup or low-load combustion. ) is provided.

Here, it cannot be said that the whole solid fuel burner is equipped with this oil gun (oil burner). However, inside the solid fuel burner, a member (not shown) for supporting a member such as a fuel concentrator (obstacle 32 in Patent Document 3) is disposed. Moreover, a member (not shown) which supports the oil gun from the outer peripheral side may be provided. The outer cylinder member of the oil gun, the member supporting the oil gun, or the member supporting the fuel concentrator or the like is called a support sleeve and is formed in an elongate cylindrical shape extending to the vicinity of the pulverized coal nozzle (fuel nozzle) opening.

On the other hand, Patent Documents 3 to 7 describe a configuration in which the elbow (shoulder bent portion) on the upstream side of the pulverized coal nozzle is arranged in a short cylindrical shape covering the outer periphery of the oil gun (oil burner), and this member is to be provided on the outer peripheral side of the support sleeve described above.

U.S. Patent No. 6,474,250 (Column 3, lines 12 to 53, Fig. 1) Korean Patent Publication No. 2002-0024430 (FIGS. 3 and 6 to 9) Japanese Patent No. 3986182 (Fig. 1, Fig. 3, Fig. 7 and Fig. 8) Japanese Patent Publication No. 3344694 (FIGS. 1, 3, 8 to 10) Japanese Patent Publication No. 3643461 (FIGS. 1, 3 to 7, 9 and 10) Japanese Patent Laid-Open No. 9-318014 (FIGS. 1 to 4, 7 and 8) Japanese Patent Publication No. 3099109 (FIGS. 1, 3, 4 and 7)

In the conventional solid fuel burner, the supplied solid fuel flows in the direction which collides from the radial direction with respect to a support sleeve in an elbow part. Accordingly, there is a problem in that the solid fuel collides with the support sleeve and the surface is worn. When the support sleeve is worn, there is a possibility that it may cause fire due to intrusion and accumulation of pulverized coal into the sleeve. In addition, when an oil burner is provided inside, it is necessary to protect the support sleeve and the oil burner from abrasion, since there is a possibility that the oil may be ignited due to leakage of oil due to wear of the oil burner and may cause a fire. Therefore, as described in Patent Documents 1 to 7, a cylindrical member (protective cylinder) that protects the support sleeve and the oil burner from being worn has been conventionally provided.

However, in this structure, although solid fuel does not collide directly with a support sleeve, since solid fuel collides with a protection cylinder, the protection cylinder wears out. In particular, the wear on the upstream surface (lower surface in each figure) on which the solid fuel directly collides becomes remarkable. Therefore, as described in Patent Document 2, a shape in which the lower surface side has a thick (pointed) shape is also performed so that the wear allowance on the lower surface is increased.

Fig. 8 is an explanatory view of an example of a protection cylinder of a conventional elbow part, and Fig. 8 (A) is a sectional view of a main part, and Fig. 8 (B) is a perspective view.

In the structure described in Patent Documents 1 to 7, the protection cylinder is fixed through the nozzle, but in the conventional example shown in Fig. 8, the protection cylinder 01 is semicircular through the flange 02 of the elbow portion inclined portion. It is a casting product integral with the collision plate 03 provided with .

Here, it is also seen that the development of wear is not uniform in the longitudinal direction of the protective barrel, but rather localized, and has a form such as erosion in a specific narrow area.

In such a case, since it is not necessary to replace the entire protective barrel integrally, including the impact plate that is not worn out, apply and grow a wear-resistant material in the form of a slurry only on the worn or eroded portion of the protective barrel. In some cases, emergency repairs to harden are performed. However, since the material of the protective cylinder itself is abrasion-resistant steel, and welding cannot be performed other than a stud for fixing the wear-resistant material in the form of a slurry, the wear-resistant material may peel off due to wear and the like accompanying use. The problem was that it was easy.

The present invention makes it a technical problem to reduce the number of replacements without wasting parts at the time of replacement, compared to the configuration in which the support sleeve protection member is integrally replaced with the collision plate.

In order to solve the above technical problem, the support sleeve protective member of the invention according to claim 1,

A support sleeve protecting member that covers the outer periphery of the support sleeve and protects the support sleeve from collision of the solid fuel with the support sleeve coaxially and radially inside the fuel nozzle for ejecting a mixed fluid of solid fuel and air In

It is disposed in a region corresponding to a bent portion in the middle of the conveying path of the mixed fluid in the fuel nozzle,

It is formed in a cylindrical shape detachable with respect to the support sleeve,
It is configured separately from the collision protection member for protecting the area where the solid fuel collides with the inner surface of the fuel nozzle,
The support sleeve protection member may be configured separately from the fuel nozzle.

The invention according to claim 2 is the support sleeve protection member according to claim 1,

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In a cross-section along the axial direction of the support sleeve, it is characterized in that it is formed in a point symmetrical shape with respect to the central portion in the axial direction and non-linearly symmetrical in the axial direction.

The invention according to claim 3 is the support sleeve protection member according to claim 1,

A rotation stop that is formed at the axial end of the support sleeve and is formed along the inner surface of the curved portion of the fuel nozzle, and contacts the inner surface of the curved portion to suppress rotation of the support sleeve in the circumferential direction It is characterized in that it has an inclined portion having a function.

In order to solve the above technical problem, the solid fuel burner of the invention according to claim 4,

A cylindrical fuel nozzle for ejecting a mixed fluid of solid fuel and air, the fuel nozzle comprising: the fuel nozzle provided with a curved portion in the middle of a conveying path of the mixed fluid;

a support sleeve disposed on the downstream side in the flow direction of the mixed fluid from the bent portion, coaxially with the fuel nozzle and radially inside;

A support sleeve protection member disposed in a region corresponding to the bent portion, covering the outer periphery of the support sleeve and formed in a cylindrical shape detachable from the support sleeve, and protecting the solid fuel from collision with the support sleeve. , characterized in that the support sleeve protection member is configured separately from the collision protection member to protect the area where the solid fuel collides with the inner surface of the fuel nozzle, and the support sleeve protection member is configured separately from the fuel nozzle.

The invention according to claim 5 is the solid fuel burner according to claim 4,

a collision protection member having a collision protection unit for protecting a region where solid fuel collides with the inner surface of the fuel nozzle, and a cylinder unit covering the outer periphery of the support sleeve;

and the support sleeve protection member mounted on the outer periphery of the cylindrical portion of the collision protection member.

The invention according to claim 6 is the solid fuel burner according to claim 4,

and a positioning portion formed at a position corresponding to an axial end of the support sleeve protecting member and contacting the end of the support sleeve protecting member to perform positioning.

According to the invention recited in claims 1 and 4, compared to the configuration in which the support sleeve protection member is integrally replaced with the collision plate, there is no waste of parts during replacement and the number of replacements can be suppressed.

Further, according to the invention as recited in claim 1 or 4, it is easier to determine when to replace the support sleeve protective member than when the support sleeve protective member is integrally configured with the collision protective member.

According to the invention described in claim 2, the support sleeve protective member can be detached once and mounted by rotating it around a point of symmetry. Therefore, when the one surface side of the support sleeve protective member is worn, the surface on the opposite side can be opposed to the side with significant wear by rotating it around the symmetry point. Therefore, compared with the non-rotatable structure, the life of the support sleeve protective member can be lengthened.

According to the invention according to claim 3, it is possible to suppress rotation of the support sleeve protective member due to collision of solid fuel and vibration during operation, compared to the case where it does not have a rotation stop function.

According to the invention described in claim 5, the support sleeve protective member is configured separately from the other collision protection member, so that the support sleeve protection member and the other collision protection member can be replaced separately. Therefore, when replacing the support sleeve protection member, compared with the configuration in which other collision protection members are also replaced, waste of parts can be reduced and cost can be suppressed.

According to the invention as set forth in claim 6, it is possible to suppress the displacement of the support sleeve protective member compared to the case where the positioning portion is not provided, so that the number of fixing parts can be minimized.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the solid fuel burner of Example 1. FIG.
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 the first embodiment, in which Fig. 3A is a cross-sectional view along the axial direction, and Fig. 3B is a view seen from the arrow IIIB direction in Fig. 3A; to be.
Figure 4 is an explanatory view of the operation of the support sleeve protective member of Example 1, Figure 4 (A) is an explanatory view of a worn state of the lower surface of the support sleeve protective member, Figure 4 (B) is Figure 4 ( It is explanatory drawing of the state which rotated the support sleeve protection member centering on the symmetry point from the state A).
Fig. 5 is an explanatory view of Modification Example 1 of the first embodiment, in which Fig. 5 (A) is a view corresponding to Fig. 3 (A), and Fig. 5 (B) is VB- in Fig. 5 (A). This is a cross-sectional view of the VB line.
6 : is explanatory drawing of the modified example 2, 3, FIG. 6(A) is explanatory drawing of the 2nd modification, and FIG. 6(B) is explanatory drawing of the 3rd modified example.
Fig. 7 is an explanatory view of a fourth modification, and is a view corresponding to Fig. 2 of the first embodiment.
Fig. 8 is an explanatory view of an example of a protection cylinder of a conventional elbow part, and Fig. 8 (A) is a sectional view of a main part, and Fig. 8 (B) is a perspective view.

Next, although an Example as a specific example of embodiment of this invention is described, referring drawings, this invention is not limited to the following Example.

In addition, in the description using the following drawings, illustration other than the member necessary for description is abbreviate|omitted suitably for the ease of understanding.

Example 1

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the solid fuel burner of Example 1. FIG.

In FIG. 1, the solid fuel burner 7 of Example 1 has the fuel nozzle 21 through which the carrier gas and the solid fuel flow. The opening of the downstream end of the fuel nozzle 21 is provided in the wall surface (furnace wall, water pipe wall) 23 of the furnace 22 of a boiler. As for the fuel nozzle 21, the fuel pipe 8 is connected to the upstream end. The fuel nozzle 21 is formed in a hollow cylindrical shape, and a flow path 24 through which a solid fuel (pulverized coal or pulverized biomass fuel) and a carrier gas flows is formed inside the fuel nozzle 21 .

The fuel nozzle 21 of Example 1 has a body part 21a of the fuel nozzle 21 extending perpendicularly to the wall surface 23 of the furnace 22 , and upstream of the body part 21a of the fuel nozzle 21 . It has an elbow portion (bent portion) 21b bent downward from the side and connected to the fuel pipe 8 . Therefore, when the fluid containing the solid fuel and the carrier gas supplied from the fuel pipe 8 passes through the elbow part 21b and flows into the body part 21a, it is inertial in the radial direction of the body part 271a. is biased outward.

On the outer periphery of the fuel nozzle 21 , an air nozzle for internal combustion (air nozzle for secondary combustion) 26 that blows combustion air to the furnace 22 is provided. Moreover, on the outer peripheral side of the air nozzle 26 for inner combustion, the air nozzle (air nozzle for tertiary combustion) 27 for outer side combustion is provided. Each of the combustion air nozzles 26 and 27 blows the air from the wind box (wind box) 28 toward the inside of the furnace 22 . In the first embodiment, at the downstream end of the internal combustion air nozzle 26, a guide vane 26a inclined outward in the radial direction with respect to the center of the fuel nozzle 21 (the diameter increases as it goes downstream) is formed. has been Moreover, the throat part 27a along the axial direction and the enlarged part 27b parallel to the guide vane 26a are formed in the downstream of the air nozzle 27 for outer side combustion. Accordingly, the combustion air blown out from the respective combustion air nozzles 26 and 27 is blown out so as to be diffused from the center of the axial direction.

In addition, although words such as combustion air and combustion air are used in the above description, it is not strictly limited to air, and it does not prevent the use of air, combustion exhaust gas, mixed gas, such as oxygen.

The flame retainer 31 is supported by the opening at the downstream end of the fuel nozzle 21 . A support sleeve (oil burner, disperser) 32 is disposed to penetrate through the center of the flow passage cross-section of the fuel nozzle 21 . The support sleeve 32 is supported while passing through 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 in which the inner diameter of the fuel nozzle 21 contracts and then expands as it goes from the upstream side to the downstream side along the flow direction of the solid fuel.

Therefore, in the venturi 33 of Example 1, when the mixed fluid of the fuel and carrier gas supplied to the fuel nozzle 21 passes through the area|region where the inner diameter is reduced, it narrows radially inwardly. Accordingly, it is possible to move the fuel deflected toward the inner wall surface vicinity of the body portion 21a of the fuel nozzle 21 toward the center.

On the downstream side of the venturi 33 , a fuel concentrator 34 is provided on the outer surface of the support sleeve 32 . The fuel concentrator 34 is formed in such a shape that the external shape of the fuel concentrator 34 expands and then decreases as it goes from the upstream side to the downstream side along the flow direction of the solid fuel.

Therefore, in the fuel concentrator 34 of Example 1, when the mixed fluid of fuel and carrier gas passes through the area|region where the external shape is expanded, the velocity component which goes radially outward is provided. Accordingly, the fuel is concentrated toward the inner wall surface of the fuel nozzle 21 .

The present invention is also applicable to burners without a fuel concentrator 34 .

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

1 and 2 , in the solid fuel burner 7 of the first embodiment, the collision protection member 41 is supported by the support sleeve 32 . The collision protection member 41 has a collision plate flange (collision plate mounting part) 41a which is detachably fixed to the elbow part 21b with a bolt etc. not shown. In the collision plate flange 41a, the cylindrical part 41b through which the support sleeve 32 penetrates is integrally formed. On the outer peripheral side of the cylinder part 41b, the protection cylinder 42 is provided as a member separate from the support sleeve 32 and the collision protection member 41 as an independent member.

In addition, in order to protect the inner surface of the upper side of the elbow part 21b, the collision plate 41c as an example of a collision protection part is formed in the upper part of the collision plate flange 41a. The collision plate 41c is formed in the semicircular shape with the lower side open similarly to the conventional structure.

Further, on the collision plate flange 41a, a positioning ring 41d as an example of a positioning part of the protective cylinder 42 is integrally formed on the outer peripheral side of the cylinder part 41b.

Fig. 3 is an explanatory view of the support sleeve protective member of the first embodiment, in which Fig. 3A is a cross-sectional view along the axial direction, and Fig. 3B is a view seen from the arrow IIIB in Fig. 3A. to be.

A protection cylinder 42 as an example of the support sleeve protection member is disposed 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 sectional drawing along the axial direction. WHEREIN: It is formed in the parallelogram shape. Therefore, the protection cylinder 42 of Example 1 is formed in the shape of point symmetry centering on the symmetry point 42b of the central part in an axial direction.

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

In addition, the outer diameter of the protection cylinder 42 is formed in the size which fits between the cylinder part 41b and the positioning ring 41d when the edge part of the protection cylinder 42 abuts against the collision plate flange 41a.

An O-ring 43 is attached between the protective cylinder 42 and the cylinder portion 41b of the first embodiment. Therefore, the protective cylinder 42 is difficult to move in the axial direction by the frictional force of the O-ring 43 in the attached state.

(Operation of Example 1)

In the solid fuel burner 7 of Example 1 provided with the said structure, even if the solid fuel supplied from the fuel pipe 8 tries to collide with the support sleeve 32 with respect to the elbow part 21b, the protection cylinder 42 ) is protected by Thus, wear of the support sleeve 32 is prevented.

Here, the protective cylinder 42 of Example 1 is a structure (separate structure) independent from the collision plate flange 41a and the collision plate 41c, unlike the conventional structure. Therefore, when the protection cylinder 42 is worn due to the collision of the solid fuel, it is possible to easily separate and replace only the protection cylinder 42 . Therefore, compared to the configuration in which the protective cylinder 42 of the first embodiment is integrally replaced with the collision plate 41c or the like, it is unnecessary to replace parts (such as the collision plate 41c) that do not need to be replaced, and waste of money. can suppress.

4 is an explanatory view of the operation of the support sleeve protective member of Example 1, FIG. 4 (A) is an explanatory view of a state in which the lower surface of the support sleeve protective member is abraded by collision of solid fuel, FIG. 4(B) ) is an explanatory view of the state in which the support sleeve protection member is rotated about the symmetry point from the state of FIG. 4A .

3 and 4, the protection cylinder 42 of Example 1 is formed in the parallelogram shape which is a point-symmetric shape centering on the symmetry point 42b. Therefore, as shown in FIG. 4, when the lower part, which is the upstream side in the conveying direction of the solid fuel, is worn, the protection cylinder 42 is separated from the support sleeve 32, and the protection cylinder is rotated about the symmetry point 42b as a center. By attaching it to (42), it can be installed so that the wear area|region 51 becomes the upper side, and the surface with little wear becomes the lower surface with significant wear. Therefore, even when the protection cylinder 42 is worn, it can be reused without replacing the protection cylinder 42 by rotating it around the symmetry point 42b and mounting it again. Therefore, the life of the protective cylinder 42 can be extended, and the cost of parts and maintenance cost can be reduced.

Further, in the first embodiment, the support sleeve 32 is protected by a collision protection member 41 or a protection cylinder 42 . Accordingly, the collision protection member 41 and the protection cylinder 42 are made of abrasion-resistant steel, and the support sleeve 32 may be made of a member having a relatively lower cost than the protection cylinder 42 or the like. By doing in this way, it is also possible to reduce the overall cost of the solid fuel burner 7 .

In addition, the support sleeve 32 is doubly protected by the cylinder part 41b of the collision protection member 41 and the protection cylinder 42 which is a member independent of the said cylinder part. Thereby, it becomes easy to grasp|ascertain the amount of wear and thinning of a support sleeve protective member, and to determine the timing of replacement and repair. That is, since the protection cylinder 42 is easily separated from the burner compared to the collision protection member 41, it is easy to measure the amount of wear and thinning by detaching it during periodic inspection or the like. In addition, even if the amount of wear and thinning of the protection cylinder 42 is not measured every time at the time of periodic inspection, etc., it is determined that a hole (penetration) has occurred in the protection cylinder 42, such as judging that it is the time for replacement and repair. handling becomes possible.

Further, in the first embodiment, the inclined surface 42a of the end abuts against the collision plate flange 41a. Accordingly, even when the solid fuel collides with the protection cylinder 42 , the protection cylinder 42 tries to rotate in the circumferential direction, the inclined inclined surface 42a interferes with the collision plate flange 41a. Therefore, the rotation of the protection cylinder 42 is regulated. Therefore, it is regulated that the protective cylinder 42 rotates and the position changes.

Moreover, in Example 1, the movement of the axial direction of the protection cylinder 42 is restricted by the O-ring 43. As shown in FIG. Therefore, while the axial position of the protection cylinder 42 is stabilized, compared with the case where the movement in the axial direction is not controlled, the rotation of the protection cylinder 42 due to the collision of solid fuel is also controlled.

(Explanation of change example)

(Modification Example 1)

Fig. 5 is an explanatory view of Modification Example 1 of Embodiment 1, in which Fig. 5A is a view corresponding to Fig. 3A, and Fig. 5B is VB- in Fig. 5A. This is a cross-sectional view of the VB line.

In FIG. 5, it is also possible to change to the structure of Example 1 shown in FIG. 3, and to form the thick part 42c centering on the part with remarkable wear. As shown in FIG. 5 , when the thick portion 42c is provided, a sufficient wear margin can be provided in a portion where the wear accompanying the collision of the solid fuel is significant. Therefore, the lifespan of the protection cylinder 42 can be further increased.

(Modifications 2 and 3)

6 : is explanatory drawing of the modified example 2, 3, FIG. 6(A) is explanatory drawing of the 2nd modification, and FIG. 6(B) is explanatory drawing of the 3rd modified example.

In Fig. 6, it is not limited to the form shown in Fig. 5(B), and as shown in Fig. 6(A), a shape ( By providing the rectifying shape) 42d, it is also expected that the solid fuel does not directly contact the protection cylinder 42 from the front, thereby reducing the force received by the protection cylinder 42 .

Moreover, as shown in FIG.6(B), it is also possible to set it as a streamline shape.

(Modification example 4)

Fig. 7 is an explanatory view of a fourth modification, and is a view corresponding to Fig. 2 of the first embodiment.

In Example 1 shown in FIG. 2, although the structure which forms the positioning ring 41d as an example of a positioning part in the collision protection member 41 was illustrated, it is not limited to this. For example, as shown in FIG. 7, it is also possible to set it as the structure which forms the positioning recessed part 41e as an example of a positioning part.

Moreover, it is also possible to set it as the structure provided with both the positioning ring 41d of FIG. 2 and the positioning recessed part 41e of FIG.

In addition, rotation is stopped by the collision protection member 41 (collision plate flange 41a) and the inclined surface of the protection cylinder 42, and the movement in the axial direction is also restricted by the frictional force caused by the weight of the protection cylinder 42. Therefore, it is also possible to have a configuration in which the positioning portions 41d and 41e are not provided.

(change example)

As mentioned above, although the embodiment of this invention was described above, this invention is not limited to the said embodiment, It is possible to implement various changes within the scope of the summary of this invention as described in the claim. Modifications (H01) to (H05) of the present invention are exemplified below.

(H01) In the above embodiment, the shape of the protective cylinder 42 is preferably a point-symmetric shape, but is not limited thereto. An asymmetric shape may be sufficient, and a line-symmetric shape may be sufficient. Further, the point-symmetric shape is not limited to a parallelogram in cross section, and it is possible to have an arbitrary cross section such as a rhombic shape or a hexagonal shape.

(H02) In the above embodiment, when the thick portions 42c and 42d are provided, the shape is not limited to the illustrated shape, and can be any shape.

(H03) In the above embodiment, although the rotation stopper constituted by the inclined surface 42a was exemplified, it is not limited thereto. It is possible to employ an arbitrary rotation stop structure, such as a key and a keyway-like shape. Moreover, although it is preferable to provide a rotation stopper, it is also possible to set it as the structure which is not provided.

(H04) In the above embodiment, the positioning portions 41d and 41e are exemplified, but it is also possible to have a configuration in which no provision is made. In addition, the shape of the positioning portions 41d and 41e is not limited to the illustrated shape, and can be changed to any positioning shape such as a fitting shape, a claw shape, or a screw fixing shape.

(H05) In the above embodiment, although the configuration in which the O-ring 43 prevents the protective cylinder 42 from moving in the axial direction was exemplified, it is not limited thereto. For example, it is also possible to employ a cushioning material having a clip or bolt fixation or flexibility.

7: solid fuel burner 21: fuel nozzle
21b: bend part 24: conveyance path
32: support sleeve 41: collision protection member
41a: collision plate flange 41b: barrel
41c: collision protection unit 41d, 41e: positioning unit
42: support sleeve protective member 42a: rotation stop
42b: central part

Claims (7)

A support sleeve protecting member that covers the outer periphery of the support sleeve and protects the support sleeve from collision with the support sleeve coaxially and radially with the fuel nozzle for ejecting a mixed fluid of solid fuel and air In
It is disposed in a region corresponding to a bent portion in the middle of the conveying path of the mixed fluid in the fuel nozzle,
It is formed in a cylindrical shape detachable with respect to the support sleeve,
It is configured separately from the collision protection member for protecting the area where the solid fuel collides with the inner surface of the fuel nozzle,
wherein the support sleeve protection member is configured separately from the fuel nozzle
Support sleeve protection member. The method of claim 1,
In a cross-section along the axial direction of the support sleeve, it is characterized in that it is formed in a point symmetrical shape with respect to the central portion in the axial direction and non-linearly symmetrical with respect to the axial direction.
Support sleeve protection member. The method of claim 1,
A rotation stop that is formed at the axial end of the support sleeve and is formed along the inner surface of the curved portion of the fuel nozzle, and contacts the inner surface of the curved portion to suppress rotation of the support sleeve in the circumferential direction characterized in that it has an inclined portion having a function
Support sleeve protection member. A cylindrical fuel nozzle for ejecting a mixed fluid of solid fuel and air, the fuel nozzle comprising: the fuel nozzle provided with a curved portion in the middle of a conveying path of the mixed fluid;
a support sleeve disposed on the downstream side in the flow direction of the mixed fluid from the bent portion, coaxially with the fuel nozzle and radially inside;
A support sleeve protection member disposed in a region corresponding to the bent portion, covering the outer periphery of the support sleeve and formed in a cylindrical shape detachable from the support sleeve, and protecting the solid fuel from collision with the support sleeve, and the support sleeve protection member configured separately from the collision protection member for protecting the area where the solid fuel collides with the inner surface of the fuel nozzle, and configured separately from the fuel nozzle
solid fuel burner. 5. The method of claim 4,
a collision protection member having a collision protection unit for protecting a region where solid fuel collides with the inner surface of the fuel nozzle, and a cylinder unit covering the outer periphery of the support sleeve;
and the support sleeve protection member mounted on the outer periphery of the cylindrical portion of the collision protection member.
solid fuel burner. 5. The method of claim 4,
and a positioning part formed at a position corresponding to the end of the support sleeve protective member in the axial direction and contacting the end of the support sleeve protective member to perform positioning.
solid fuel burner. delete

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