JP2014105931A - Burner nozzle, and current plate attaching and detaching method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burner nozzle applied to combustion equipment where a powder fuel is supplied and combusted, capable of improving abrasion resistance of a current plate and facilitating repair and replacement work for the current plate.SOLUTION: A burner nozzle 10 for combustion equipment where a powder fuel is combusted includes: a cylindrical nozzle body 11 inside which the powder fuel flows; a front nozzle 12 and a rear nozzle 13 disposed respectively at the furnace inner side and the furnace outer side of the nozzle body 11 halved in the axial direction; a current plate 20 provided inside the nozzle body 11; a guide rail 30 provided for an inner wall face of each of the front nozzle 12 and the rear nozzle 13 to support at least one end part of the current plate 20; and a bolt/nut 40 for fixing the front nozzle 12 and the rear nozzle 13 to each other detachably. The guide rail 30 includes: a front rail 32 and a rear rail 34 whose rail parts are positioned on the same straight line and stoppers 31, 33 for defining a furnace inner end position and a furnace outer end position of the current plate 20.

Description

  The present invention relates to a burner nozzle applied to combustion equipment for supplying and burning pulverized fuel, such as pulverized coal used in a pulverized coal burning boiler, and a burner nozzle rectifying plate attaching / detaching method.

Conventionally, inside the burner nozzle (pulverized coal burner nozzle) that uses pulverized coal as a fuel, a rectifying plate is installed in parallel with the pulverized coal flow for the purpose of adjusting the flow of the pulverized coal and adjusting the flow direction of the pulverized coal to the direction of the burner nozzle. Has been.
This baffle plate is a member arranged in the pulverized coal flow in the burner nozzle. For this reason, even when the rectifying plate is arranged in parallel with the flow, it is inevitable that the rectifying plate is worn to some extent by the collision of the pulverized coal, and therefore, it is required to use a material that does not easily wear.

On the other hand, the shape of the burner nozzle is complicated, and it may be manufactured by casting or by welding a metal plate. Further, since the tip of the burner nozzle receives heat radiation from a high-temperature furnace, it is necessary to select a material that takes heat resistance into consideration, and therefore the material and temperature distribution may differ from the current plate.
In such a situation, a difference in thermal expansion occurs between the burner nozzle and the rectifying plate. Therefore, when the rectifying plate is installed inside the burner nozzle, the rectifying plate is completely fixed to the burner nozzle by welding. However, as a structure in which the rectifying plate is fitted into the mounting rail provided on the nozzle side, a structure in which stress due to the difference in thermal expansion does not occur. (For example, see Patent Documents 1 and 2 below)

On the other hand, with the recent downsizing of boilers, the radiant heat received by the burner nozzle is increasing. For this reason, for example, the conventional burner nozzle 1 shown in FIG. 7 not only uses a nozzle material having high heat resistance, but also separates the nozzle itself into a front nozzle 2 inside the furnace and a rear nozzle 3 outside the furnace, and the bolt 4 The front / rear part split type structure is used. The burner nozzle 1 having such a front and rear divided structure is made by replacing only the front part having a severe heat load even if the material inside the furnace having a severe heat load is made of a material having high heat resistance and burned. It can be done.
In addition, the code | symbol 5 in a figure has shown the baffle plate, and 6 has shown the guide rail (mounting rail).

The above-described front / rear divided burner nozzle 1 has a structure in which the guide rail 6 on which the rectifying plate 5 is installed is installed on the rear nozzle 3 side, so that the influence of thermal deformation on the rectifying plate 5 is reduced. In other words, in the burner nozzle 1 having a front and rear divided structure, the rectifying plate 5 is installed on the rear nozzle 3 side with less thermal deformation.
The rectifying plate 5 is inserted from the inside of the furnace into the rectifying plate insertion port 6a opened at the end of the guide rail 6 in the furnace direction with the front nozzle 2 removed, and thereafter the rectifying plate insertion port 6a. A stopper 7 is welded and attached to the front end of the rail to prevent it from coming off.

JP-A-60-103207 JP 62-33073 A

By the way, in the above-described front / rear divided burner nozzle 1, the insertion length of the rectifying plate 5 with respect to the guide rail 6 is restricted by the length of the rear nozzle 3. Furthermore, since the rectifying plate 5 is worn from the upstream side (outer side of the furnace) in the pulverized coal flow direction, it has a structure in which it is difficult to secure a sufficient margin for durability without ensuring a sufficient margin for wear. .
Further, in the burner nozzle 1 having the conventional structure described above, it is necessary to temporarily remove the stopper 7 provided at the rectifying plate insertion port 6a of the rear nozzle 3 at the start of work when the rectifying plate 5 is repaired or replaced. After the end, it is necessary to recover by attaching the stopper 7 again. Such removal / recovery work of the stopper 7 complicates repair / replacement work of the current plate 5.

From such a background, in a burner nozzle applied to combustion equipment for supplying and burning pulverized coal, such as a pulverized coal-fired boiler using pulverized coal as fuel, in addition to improving the wear resistance of the rectifying plate, There is a need to simplify the repair and replacement work of the current plate.
The present invention has been made to solve the above-described problems, and its object is to be applied to a burner nozzle of a combustion facility that supplies and burns pulverized fuel to improve wear resistance of the rectifying plate and to rectify the rectifying plate. An object of the present invention is to provide a burner nozzle capable of simplifying the repair / replacement operation of a plate and a method of attaching / detaching a current plate to the burner nozzle.

In order to solve the above problems, the present invention employs the following means.
A burner nozzle according to the present invention is a burner nozzle of a combustion facility for supplying and burning pulverized fuel, and a cylindrical nozzle body through which the pulverized fuel flows, and an inner side of the furnace in which the nozzle body is divided in the axial direction A front nozzle and a rear nozzle outside the furnace, a baffle plate installed inside the nozzle body, and at least one end of the baffle plate provided on each inner wall surface of the front nozzle and the rear nozzle. A guide rail for supporting, and a coupling means for detachably fixing between the front nozzle and the rear nozzle, the guide rail of the front nozzle having the rail portions located on the same straight line. A front rail provided on the inner wall, a rear rail provided on the inner wall of the rear nozzle, and a stopper defining the furnace inner end position and the furnace outer end position of the rectifying plate. It is characterized in.

  According to such a burner nozzle of the present invention, a cylindrical nozzle body in which the pulverized fuel flows inside, a front nozzle inside the furnace and a rear nozzle outside the furnace divided in the axial direction, and a nozzle body The rectifying plate installed in the interior, the guide rail that is provided on the inner wall surface of each of the front nozzle and the rear nozzle and supports at least one end of the rectifying plate, and the front nozzle and the rear nozzle can be attached and detached. The guide rail includes a front rail provided on the inner wall of the front nozzle and a rear rail provided on the inner wall of the rear nozzle, and the rectifier Since it has a stopper that defines the position of the furnace inner end and the furnace outer end of the plate, the length of supporting the end of the current plate with the guide rail is increased, and the wear near the end of the current plate is prevented. Endurance It is possible to increase the. That is, the guide rail can be extended in rail length by the front rail and the rear rail, and the stopper can be positioned and fixed at a predetermined position by defining the positions of both ends of the current plate.

  Moreover, if the front nozzle is removed and the inner end of the furnace is not restricted by the stopper, it can be attached and detached by sliding along the guide rail from the inner side of the rear nozzle.・ Replacement work can be simplified.

  A burner nozzle rectifying plate attaching / detaching method according to the present invention is a burner nozzle rectifying plate attaching / detaching method which is attached to a combustion facility for supplying and burning pulverized fuel, and a rectifying plate is installed in a cylindrical nozzle body. A guide rail that supports at least one end of the current plate is provided on the inner wall surface of the front nozzle inside the furnace and the rear nozzle outside the furnace obtained by dividing the nozzle body in the axial direction, and when the current plate is fixed, The front nozzle is attached and sliding is restricted at both axial ends of the guide rail. When the rectifying plate is attached or detached, the front nozzle is removed from the furnace inner opening of the rear nozzle and formed along the guide rail. The slide is allowed to be allowed.

  According to the burner nozzle rectifying plate attaching / detaching method of the present invention, at least one end portion of the rectifying plate is supported on the inner wall surface of the front nozzle inside the furnace and the rear nozzle outside the furnace obtained by dividing the nozzle body in the axial direction. A guide rail is provided. When the rectifying plate is fixed, the front nozzle is attached to restrict sliding at both ends in the axial direction of the guide rail, and when the rectifying plate is attached or detached, the front nozzle is removed to form the inside of the furnace Since sliding along the guide rail is allowed from the opening, the rail extension with the guide rail on the front nozzle side also increases the durability against wear, and with the front nozzle removed, the inside of the rear nozzle furnace Since the current plate can be attached and detached by sliding along the guide rail from the opening, the repair and replacement work of the current plate can be simplified.

  According to the burner nozzle and the burner nozzle rectifying plate attaching / detaching method of the present invention described above, in the burner nozzle of the combustion equipment for supplying and burning pulverized coal or other pulverized fuel, the wear resistance of the rectifying plate is improved, and the rectifying plate The effect of simplifying the repair / replacement work can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows one Embodiment which concerns on the burner nozzle which concerns on this invention, and the baffle nozzle baffle plate attachment / detachment method, (a) is a horizontal sectional view (BB sectional drawing of FIG. 3) which shows the structural example of a burner nozzle, (b) It is an AA cross-sectional enlarged view of (a). FIG. 2 is an exploded view of the burner nozzle shown in FIG. It is the front view which looked at the burner nozzle shown to Fig.1 (a) from the furnace inner side. It is CC sectional drawing of the burner nozzle shown in FIG. It is sectional drawing which shows the main components of the burner nozzle shown in FIG. 3, (a) is a front nozzle, (b) is a baffle plate, (c) is a rear nozzle. It is sectional drawing which shows the modification of a stopper, (a) is a front nozzle, (b) is a baffle plate, (c) is a rear nozzle. It is a schematic block diagram which shows the prior art example which concerns on the front-and-rear part division type burner nozzle, (a) is a longitudinal cross-sectional view which shows the structural example which inserted and supported the baffle plate in the guide rail, (b) is the horizontal of (a). It is sectional drawing.

Hereinafter, an embodiment is described based on a drawing about a burner nozzle concerning the present invention, and a baffle nozzle rectifying plate attaching / detaching method.
The burner nozzle 10 of the embodiment shown in FIGS. 1 to 5 is used in a pulverized coal-fired boiler (combustion facility) that supplies and burns pulverized coal (pulverized fuel) obtained by pulverizing coal.
The burner nozzle 10 includes a front nozzle 12 inside the furnace and a rear nozzle 13 outside the furnace, which are obtained by dividing a cylindrical nozzle body 11 in the axial direction of the nozzle body 11 (the direction of pulverized coal flow), and the inside of the nozzle body 11. The installed flow straightening plate 20, and guide rails 30 provided on the inner wall surfaces of the front nozzle 12 and the rear nozzle 13 to support both end portions 21c in the axial direction of the flow straightening plate 20 (direction perpendicular to the pulverized coal flow direction) And a bolt / nut (coupling means) 40 for detachably fixing the front nozzle 12 and the rear nozzle 13.

The nozzle body 11 is for injecting and burning fuel pulverized coal and combustion air into the furnace of a pulverized coal burning boiler. The illustrated nozzle body 11 has a structure in which the secondary front nozzle 14 is provided on the outer peripheral side of the front nozzle 12, which is also referred to as a primary front nozzle, but is not limited thereto.
Further, a front secondary air flow path 15 serving as a flow path for secondary air is formed between the outer peripheral surface of the front nozzle 12 and the inner peripheral surface of the secondary front nozzle 14. The front secondary air flow path 15 communicates with a rear secondary air flow path 16 on the outer peripheral side of the rear nozzle 13 formed in an inner and outer double cylindrical shape.

In this case, the front nozzle 12 and the rear nozzle 13 are detachably integrated with a bolt and nut 40 so that the flange portion 14a of the secondary front nozzle 14 is sandwiched between the flange portions 12a and 13a. Has been.
A bolt and nut 40 shown in FIG. 1 and FIG. 2 includes, in order from the outside of the furnace of the rear nozzle 13, a fixed bolt 41 that passes through the flange portions 13 a, 14 a, and 12 a toward the inside of the furnace, and the inside of the furnace with respect to the bolt 41. Is provided with a washer 42, a detent washer 43, a nut 44, and a cap nut 45, but any coupling means that can removably fix the front nozzle 12 and the rear nozzle 13 There is no particular limitation.

The rectifying plate 20 adjusts the flow of the pulverized coal supplied together with the primary air and adjusts the flow direction of the pulverized coal to the axial direction of the burner nozzle 10 (the pulverized coal flow direction). A horizontal rectifying plate 21 and / or a vertical rectifying plate 22 which is parallel to the axial direction of the burner nozzle 10 and arranged so as to be vertical, and which is installed inside the nozzle body 11 Guide member.
In the rectifying plate 20 shown in FIG. 3, inside the nozzle body 11, the rectifying plate 20 is configured in a cross beam shape by two rectifying plates, an upper rectifying plate 20 a disposed above and a lower rectifying plate 20 b disposed below. The upper rectifying plate 20a includes one horizontal rectifying plate 21a and two vertical rectifying plates 22a. Further, the lower rectifying plate 20b includes one horizontal rectifying plate 21b and two vertical rectifying plates 22b. In addition, although the baffle plate 20 showed the example comprised by the cross beam shape by two baffle plates, it is not limited to this, The flow direction of pulverized coal is arranged and the flow direction is matched with the axial direction of the burner nozzle 10. If possible, at least one sheet may be arranged in the horizontal direction or the vertical direction parallel to the axial direction.

The rectifying plate 20 is inserted along the guide rail 30 from the opening formed inside the furnace of the rear nozzle 13 in a state where the front nozzle 12 is removed from the rear nozzle 13, and slides along the guide rail 30. It is possible to attach and detach. Further, the rectifying plate 20 inserted into a later-described rear guide rail 34 of the rear nozzle 13 and slid to a predetermined position is fixed at a predetermined position in the nozzle body 11 with the front nozzle 12 attached to the rear nozzle 13. Installed.
In the illustrated configuration example, a structure in which both end portions 21c of the horizontal rectifying plate 21 are inserted into and supported by the guide rails 30 is adopted. For example, the rectifying plate 20 includes one vertical rectifying plate 22. Is not particularly limited, such as supporting only both ends or the lower end of the vertical rectifying plate 22. Moreover, when supporting the both ends 21c of the horizontal rectifying plate 21, it is desirable to provide an appropriate gap (for example, about 3 mm) at both ends of the vertical rectifying plate 22 in consideration of thermal expansion.

As shown in FIGS. 1B and 5, the guide rail 30 of the present embodiment includes a front rail 32 provided on the inner wall of the front nozzle 12 and a rear rail 34 provided on the inner wall of the rear nozzle 13. The front rail 32 and the rear rail 34 have their rail portions located on the same straight line.
Further, both ends of the guide rail 30 in the axial direction (in the direction of pulverized coal flow), that is, the furnace inner end of the front rail 32 and the furnace outer end of the rear rail 34 are positioned on the furnace inner end of the current plate and the furnace outer side. A stopper 31 and a stopper 33 for defining the end position are provided.
When the front nozzle 12 is attached to the rear nozzle 13 and integrated with each other, both end portions 21c of the horizontal rectifying plate 21 inserted into the guide rail 30 have both end surfaces in the sliding direction (the direction of pulverized coal flow). Since it abuts against the stoppers 31 and 33 provided at both ends in the axial direction of the guide rail 30, it is held at the predetermined position described above.

In the configuration example shown in FIG. 5, a separate stopper 31 is attached to the furnace inner end of the front rail 32, and an integral stopper 33 is provided at the furnace outer end of the rear rail 34. There are no particular limitations as long as the inner and outer ends of the furnace 30 can be defined, in other words, the sliding range (predetermined position) of the current plate 20 on the guide rail 30 can be defined.
As a specific example, as shown in FIG. 6, for example, separate protrusions (for example, bolts, pins, etc.) provided at the rail outer position on the slide extension line of the guide rail 30 may be used as the stoppers 31A and 33A.

  Further, for example, a stopper provided so as to close the furnace outer end of the rear rail 34, such as the stopper 33 shown in FIG. 1B, suppresses the flow of pulverized coal particles along the guide rail 30. Contribute to wear reduction. Such a stopper for closing the outer end of the furnace may be integral with or separate from the guide rail 30. In addition, the stopper integrated with the guide rail 30 is bent so that, for example, a channel section having a closed outer end of the furnace or a wall member facing the end of the guide rail intersects, The crossed ends may be closed by welding.

As described above, the guide rail 30 is provided on the inner wall surface of the front nozzle 12 and the rear nozzle 13 which are divided into two in the axial direction of the nozzle body 11, and the rectifying plate 20 whose end is supported by the guide rail 30 is It is possible to attach and detach by sliding along the guide rail 30 from the furnace inner side of the rear nozzle 13 with the front nozzle 12 removed, and fixed at a predetermined position with the front nozzle 12 attached to the rear nozzle 13. It is configured.
Moreover, if the rail is extended by providing the guide rail 30 having the front rail 32 on the front nozzle 12 side, the flow straightening plate 20 can be used against the wear of the flow straightening plate 20 caused by the collision of the pulverized coal flow. At both ends in the axial direction, wear due to the pulverized coal flow is likely to occur. However, it is possible to increase the length of supporting both ends of the rectifying plate 20 with the guide rails 30. As a result, there is a dimensional allowance for wear loss, and the durability can be further increased.
That is, as compared with the conventional structure, since the fitting length for inserting and supporting the rectifying plate 20 into the guide rail 30 is increased, the dimensional margin for wear of the rectifying plate 20 is also increased.

Furthermore, since the rectifying plate 20 can be attached and detached by sliding along the rear rail 34 from the inside of the furnace of the rear nozzle 13 with the front nozzle 12 removed, the repair and replacement work of the rectifying plate 20 is simplified. be able to.
Further, since the guide rail 30 includes a front rail 32 having a stopper 31 and a rear rail 34 having a stopper 33, extension of the rail length by the front rail 32 and the rear rail 34, and the stopper 31, By 33, the current plate 20 can be reliably positioned and fixed at a predetermined position.

The burner nozzle 10 having the above-described configuration can attach and detach the rectifying plate 20 by the attaching and detaching method (procedure) described below.
The nozzle body 11 of the burner nozzle 10 includes guide rails 30 that support both end portions 21c of the horizontal rectifying plate 21 on the inner wall surfaces of the front nozzle 12 inside the furnace and the rear nozzle 13 outside the furnace divided in the axial direction. . Since this guide rail 30 is divided into a front rail 32 and a rear rail 34, the rectifying plate 20 is inserted from the front end opening of the rear nozzle 13 with the front nozzle 12 removed when the rectifying plate 20 is attached or detached. Or pull out.

When the rectifying plate 20 is installed and fixed at a predetermined position, the rectifying plate 20 is first inserted into the rear rail 34 at the rear end portions (outside the furnace) of the both end portions 21 c of the horizontal rectifying plate 21. At the time of such insertion, the horizontal rectifying plate 21 is slidable to a predetermined position where the rear end surface in the axial direction comes into contact with the stopper 33.
After the rectifying plate 20 is thus inserted to the predetermined position of the rear nozzle 13, the front nozzle 12 is attached to the front end portion of the rear nozzle 13. At this time, the front rail 32 is inserted into the front end portion (inside the furnace) of the both end portions 21 c of the horizontal rectifying plate 21, and is slidable to a predetermined position where the axial front end surface comes into contact with the stopper 31.

As a result, since the slide of the rectifying plate 20 is restricted by the stoppers 31 and 33 at both axial ends of the guide rail 30, if the front nozzle 12 is fixed to the rear nozzle 13 by the bolts and nuts 40, the rectifying plate 20 The fixed installation at the predetermined position is completed.
On the other hand, when the rectifying plate 20 is removed, the front nozzle 12 can be removed by releasing the fixing with the bolts and nuts 40. When removing the front nozzle 12, the front rail 32 slides along the front end side of the horizontal rectifying plate 21. When the front nozzle 12 is removed in this way, an opening is formed inside the furnace of the rear nozzle 13, so that the current plate 20 can be pulled out from this opening. At this time, the rectifying plate 20 slides along the rear rail 34 on the rear end side of the horizontal rectifying plate 21.

  According to the method of attaching / detaching the rectifying plate of the burner nozzle 10 described above, the both end portions 21c of the horizontal rectifying plate 21 are formed on the inner wall surfaces of the front nozzle 12 inside the furnace and the rear nozzle 13 outside the furnace obtained by dividing the nozzle body 11 in the axial direction. A guide rail 30 to be supported is provided, and when the rectifying plate 20 is fixed, the front nozzle 12 is attached and sliding is restricted at both ends in the axial direction of the guide rail 30, and when the rectifying plate 20 is attached and detached, the front nozzle 12 is removed. Sliding along the guide rail 30 from the furnace inner opening of the formed rear nozzle 13 is allowed.

Therefore, due to the rail extension of the guide rail 30 provided with the front rail 32 on the front nozzle 12 side, the length of the guide rail 30 that fixes and supports the rectifying plate 20 is increased, which is caused by the pulverized coal flow during operation. Therefore, the durability of the rectifying plate 20 can be increased by the extension of the length. That is, if the guide rail 30 is extended by the additional amount of the front rail 32, the fitting length of the rectifying plate 20 is increased about twice, and as a result, the allowable wear amount and the life are also increased about twice. .
Further, in a state where the front nozzle 12 is removed, the rectifying plate 20 can be attached and detached by sliding along the guide rail from the furnace inner opening of the rear nozzle 13, so that repair and replacement work of the rectifying plate 20 is simplified. be able to.

According to the embodiment of the present invention described above, in the burner nozzle 10 of the combustion facility that supplies and burns pulverized coal or other pulverized fuel, the wear resistance of the rectifying plate 20 is improved, and the rectifying plate 20 is repaired and repaired. Exchange work can be simplified.
Specifically, the guide rail 30 that supports the rectifying plate 20 is configured by a front rail 32 and a rear rail 34 that are divided into two in the axial direction, and a stopper 31 is provided at the end of the front rail 32 inside the furnace. The rectifying plate 20 is easily attached and detached by removing the bolts and nuts 40 that fix the front nozzle 12 and the rear nozzle 13 and removing the front nozzle 12.

  Therefore, the rectifying plate 20 can be removed by removing the bolts / nuts 40 and the front nozzle 12, and work using a fusing machine or a grinder is not necessary. In the above-described conventional structure, the work period required for the replacement work of the rectifying plate 20 required about 8 hours for one burner nozzle 10, but by adopting the structure described in the present embodiment, about 2 hours. Can be shortened.

The front and rear integrated burner nozzle 1 has a large temperature difference in the nozzle and a high thermal stress, whereas the front and rear divided burner nozzle 10 has a reduced temperature difference in the nozzle and cracks due to the thermal stress. There is also an advantage that damage such as can be suppressed.
The present invention is not limited to the above-described embodiment. For example, the powdered fuel may be a solid carbonaceous fuel in powder form, and thus, for example, biomass fuel or the like can be used. The fuel is not limited to pulverized coal, and can be changed as appropriate without departing from the scope of the invention.

1,10 Burner nozzle 2,12 Front nozzle 3,13 Rear nozzle 5,20 Current plate 6,30 Guide rail 7,31,33 Stopper 11 Nozzle body 14 Secondary front nozzle 21 Horizontal current plate 22 Vertical current plate 32 Front Rail 34 Rear rail 40 Bolt / Nut (coupling)

Claims (2)

A burner nozzle for a combustion facility for supplying and burning pulverized fuel,
A cylindrical nozzle body through which the pulverized fuel flows, a front nozzle inside the furnace and a rear nozzle outside the furnace, which are divided in the axial direction, and a rectifying plate installed inside the nozzle body; A guide rail provided on the inner wall surface of each of the front nozzle and the rear nozzle to support at least one end of the rectifying plate, and a coupling for detachably fixing the front nozzle and the rear nozzle Means and
The guide rail includes a front rail provided on an inner wall of the front nozzle and a rear rail provided on an inner wall of the rear nozzle, where the rail portions are located on the same straight line, and a furnace inner end of the current plate A burner nozzle comprising: a stopper that defines a position of the part and a position of the outer end of the furnace. A rectifying plate attaching / detaching method of a burner nozzle, which is attached to a combustion facility for supplying and burning pulverized fuel, and a rectifying plate is installed in a cylindrical nozzle body,
Provide a guide rail that supports at least one end of the rectifying plate on the inner wall surface of the front nozzle inside the furnace and the rear nozzle outside the furnace divided in the axial direction of the nozzle body,
At the time of fixing the current plate, the front nozzle is attached and sliding is restricted at both axial ends of the guide rail,
A method of attaching / detaching a rectifying plate for a burner nozzle, wherein, when the rectifying plate is attached / detached, sliding along the guide rail is allowed from a furnace inner opening of the rear nozzle formed by removing the front nozzle.

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