JP5622557B2 - Boiler sidewall manufacturing method and boiler sidewall fins - Google Patents

Description

  The present invention relates to a method for manufacturing a boiler side wall and a fin used for the boiler side wall.

  One of the major power generation methods is thermal power generation. Thermal power generation has a high utility value as a power generation method that is safe and capable of dealing with load fluctuations, and is expected to continue to play an important role in the power generation field.

  In a boiler furnace generally used for thermal power generation, a side wall which is an inner wall of the boiler furnace has a water wall panel structure. In a boiler furnace having a water wall panel structure on the side wall, a water wall having a plurality of side wall pipes attached to the pipe from which the fluid (water) is supplied to the pipe provided at the inlet of the side wall. It is supplied substantially evenly to each side wall pipe of the panel. And it heats up with each said side wall pipe, rises in a side wall pipe, and is guide | induced to the superheater which is a backflow apparatus.

  Such a structure of the boiler side wall in which a plurality of side wall pipes are attached to the pipe holder has already been put into practical use, and is disclosed in Patent Document 1, for example. In the technique disclosed in Patent Document 1, the water pipes located on the left and right of each ceiling pipe are located where the riding pipes extended from the ceiling pipe pipe located in the vent house of the boiler penetrate the membrane panel. The lower part of the vent house casing and the membrane panel are connected to the membrane bar via a filler plate, and a small hole of the width of the membrane bar is provided above and close to the connecting portion, and is formed at the lower edge of the small hole. Is built-up welded and provided with a narrow groove from the upper edge of the small hole to the upper end of the membrane bar.

FIG. 6 is an explanatory diagram relating to a conventional method for manufacturing a boiler side wall as disclosed in Patent Document 1.
In FIG. 6, 101 is a pipe holder, and 102 is a panel in which a plurality of side wall pipes 121 are connected by seal fins 122.

In the conventional boiler side wall manufacturing method, as shown in FIG. 6, insertion holes 111 for inserting the front ends of the side wall pipes 121 are provided in the pipes 101 at a predetermined interval l ₂ . In addition, a plurality of side wall pipes 121 are arranged at regular intervals l ₂ ′, and seal fins 122 are connected between the side wall pipes 121 by welding to manufacture the panel 102. Here, l ₂ and l ₂ ′ are set so that l ₂ = l ₂ ′.

And the front-end | tip of each side wall pipe 121 which comprises the panel 102 is inserted in the insertion hole 111 of the header 101 provided in the corresponding position, and each side wall pipe 121 and the insertion hole 111 are welded.
After that, each seal fin 122 is provided with a slit 123 cut from the tip on the nozzle 101 side by gas cutting, and a stop hole 124 is provided at the tip of the slit 123 by drilling. The slit 123 is provided to prevent the seal fin 122 from being distorted due to thermal expansion in the longitudinal direction (B ′ direction in FIG. 6) of the nozzle 101, and the stop hole 124 is distorted by the thermal expansion. Even if such a phenomenon occurs, it is provided to prevent the crack generated in the seal fin 122 from extending due to the distortion.

JP 63-294404 A

  However, in the conventional boiler side wall manufacturing method shown in FIG. 6, the panel 102 is manufactured by connecting the seal fins 122 between the side wall pipes 121 by welding, and then the side wall pipes 121 constituting the panel 102 are connected to the pipes. A slit 123 and a stop hole 124 are provided in the seal fin 122 after being inserted into the insertion hole 111 of the stopper 101 and welded. That is, since the slit 123 and the stop hole 124 are provided after the panel 102 is connected to the nozzle 101, the seal fin 122 cannot be freely moved at the time when the slit 123 is provided. Therefore, the posture of the worker involved in the work for providing the slit 123 and the stop hole 124 is limited, and there is a problem that the work time for providing the slit 123 and the stop hole 124 becomes long.

  Accordingly, in the present invention, a plurality of side wall tubes are arranged in parallel at a predetermined interval, a panel is formed by attaching fins so as to close the interval, and the plurality of side wall tubes constituting the panel are formed by welding. In the method for manufacturing a boiler side wall manufactured by connecting to a side wall, the seal fin has a slit cut from the tip on the side of the pipe side, and the boiler side wall can reduce the working time for manufacturing the boiler side wall. An object is to provide a manufacturing method. In addition, an object is to provide a seal fin used for manufacturing the boiler side wall.

  In order to solve the above problems, in the present invention, a plurality of side wall pipes are arranged in parallel at a predetermined interval, and fins are attached to the side wall pipes so as to close the gap, thereby forming the panel. In the method for manufacturing a boiler side wall manufactured by connecting the plurality of side wall pipes constituting the pipe to the nozzle by welding, the fin includes a fin main body and a fin member provided with a slit, and the interval is set. A panel is formed by attaching a fin main body to the side wall pipe so as to close, and after connecting the panel to the pipe holder, the slit is positioned on the pipe side of the fin main body. The fin member is attached as described above.

Thus, by attaching a fin member provided with a slit in advance to the fin body later, the fin member is free to move at the time of providing the slit, and the posture of the worker involved in the work for providing the slit is limited. There is nothing, and the time for slit manufacturing can be shortened.
Further, at the time when each side wall pipe is inserted into the insertion hole of the side wall, a fin member that firmly restrains the front side end portion of each side wall pipe is not attached. For this reason, the degree of freedom given to the end portion on the side of the side wall pipe is large, and alignment during insertion is easy, that is, the time required for insertion can be shortened.
Furthermore, it is possible to produce a large number of fin members in advance as the same standard product at a factory or the like, and in this case, it is possible to further reduce the time and cost for manufacturing the slit.

Moreover, it is good to attach to the said fin main body the fin member by which the hole part larger diameter than the said slit width is provided in the terminal part by the side of the fin main body of the said slit.
The slit is provided in order to prevent the seal fin from being distorted due to thermal elongation in the longitudinal direction of the pipe holder. However, by the provision of the stop hole, distortion due to the thermal elongation occurred. Even if it is a case, it can prevent that the crack which arises in a seal fin by this distortion extends.

  In addition, the panel is suspended from above in a state where the panel is stably stood at the upper part of the pipe, and after the panel is connected to the pipe, the joint between the panel and the pipe is stably stood. It is good to hang from above in the state and to attach the fin member to the tip side of the pipe side of the fin.

  Thereby, since the said panel can always be stood stably during manufacture of a boiler side wall, it is not necessary to perform the welding operation which concerns on each said joint by manual welding, and robot welding is attained. Accordingly, it is possible to eliminate the possibility of burns due to manual welding and to shorten the welding work.

  In addition, the boiler side wall fin that forms a panel by forming a part of the boiler side wall and being attached to the side wall pipe so as to close the gap between the plurality of side wall pipes arranged in parallel at a predetermined interval. The panel forms a boiler side wall by connecting the plurality of side wall pipes to a nozzle by welding, and the fin is composed of a fin main body and a fin member, and the fin main body is the gap The fin member is provided with a slit, and the tip of the fin body side of the fin body so that the slit is located on the pipe side. It is attached to.

  The fin member may be provided with a hole having a diameter larger than the slit width and smaller than the fin member width at a tip of the slit.

  According to the present invention, a plurality of side wall pipes are arranged in parallel at a predetermined interval, a panel is formed by attaching fins so as to close the gap, and the plurality of side wall pipes constituting the panel are piped by welding. In the method for manufacturing a boiler side wall manufactured by connecting to a side wall, the seal fin has a slit cut from the tip on the side of the pipe side, and the boiler side wall can reduce the working time for manufacturing the boiler side wall. A manufacturing method can be provided. In addition, a seal fin used for manufacturing the boiler side wall can be provided.

It is a perspective view of the boiler furnace which concerns on an Example. It is the schematic of the side wall of a boiler furnace. It is explanatory drawing regarding the manufacturing method of the boiler side wall in an Example. It is the schematic of a fin member. It is explanatory drawing which concerns on the welding work of a pipe holder and a panel. It is explanatory drawing regarding the manufacturing method of the conventional boiler side wall.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

  FIG. 1 is a perspective view of a boiler furnace according to an embodiment. As shown in FIG. 1, the boiler furnace 50 has many pipes 51 attached in the vicinity of an outer wall, and has a combustion chamber 52 for burning fuel inside, and a side wall which is an inner wall of the combustion chamber 52 is As will be described later, it is formed by a panel composed of a header and a side wall tube and a seal fin.

  In the boiler furnace shown in FIG. 1, the fluid (water) is supplied to the pipe holder 1 and is supplied to the plurality of side wall pipes connected to the pipe holder 1 and constituting the panel substantially uniformly, and each side wall pipe absorbs heat. It rises while performing and is led to the superheater which is the downstream equipment.

FIG. 2 is a schematic view of the side wall of the boiler furnace.
In FIG. 2, reference numeral 1 denotes a pipe, which is disposed in the horizontal direction below the combustion chamber 52. Reference numeral 2 denotes a panel, the configuration of which will be described later.

  The panel 2 includes a plurality of side wall pipes 21 and seal fins 22 that are located between the side wall pipes 21 and are welded to the side wall pipes 21. A fin member 25 provided with a slit 23 and a stop hole 24 is attached to the end of the seal fin 22 on the side of the pipe 1. The joint position between the seal fin 22 and the fin member 25 is referred to as a fin cut 26.

Reference numeral 27 denotes an edge bar, which is attached to the side surface of the outermost side wall pipe 21 and is used for connecting the panel 2 (side wall pipe 21) to the accessory part 28 and the like by welding.
Reference numeral 30 denotes a hydraulic pressure blocking plate that blocks the upper portion of each side wall tube 21. The water pressure blocking plate 30 is attached at the time of manufacturing the side wall of the boiler furnace in order to perform a pressure resistance test by the water pressure inside the side wall pipe 21 and the header 1, and is removed after the pressure resistance test is completed.

  As shown in FIG. 2, in the present embodiment, the header 1 and the panel 2 are divided into three parts, but the present invention is not limited to this.

Next, a method for manufacturing the inner wall of the boiler furnace shown in FIG. 2 will be described with reference to FIG.
FIG. 3 is an explanatory diagram relating to a method for manufacturing a boiler side wall in the embodiment, and corresponds to a view in the vicinity of part A in FIG. 2.

  In FIG. 3, reference numeral 1 denotes a pipe holder, and 2 denotes a panel in which a plurality of side wall pipes 21 are connected by seal fin bodies 22. Reference numeral 25 denotes a fin member that is attached to the tip of the seal fin body 22 on the side of the pipe 1 and will be described in detail later.

In the boiler side wall manufacturing method according to the present embodiment, as shown in FIG. 3, the insertion holes 11 for inserting the side wall pipes 21 are provided in the pipe holder 1 at a predetermined interval l ₁ . Further, with arranging a plurality of side wall tubes 21 each defined interval l _{1 'and} connected by welding a sealing fin body 22 between each side wall pipe 21. Here, l ₁ and l ₁ ′ are set so that l ₁ = l ₁ ′.

And each side wall pipe 21 is inserted in the insertion hole 11 of the nozzle 1 provided in the corresponding position, and each side wall pipe 21 and the insertion hole 11 are joined by welding.
Then, the fin member 25 is attached to the front end side of each seal fin 22 on the pipe side 1 side.

FIG. 4 is a schematic view of the fin member 25.
As shown in FIG. 4, the fin member 25 is provided with a slit 23 cut from the longitudinal tip by gas cutting, laser cutting or the like, and a stop hole 24 provided by drilling at the tip of the slit 23. Is provided.
Length in the lateral direction of l ₃ of the fin member 25 _'is set to be the same as the length in the lateral direction of l ₃ of the seal fins 22.

  The fin member 25 is attached to the seal fin 22 by aligning the end of the fin member 25 with the end of the seal fin 22 so that the cut portion of the slit 23 is on the side of the pipe 1 and connecting the fin member 25 and the seal fin 22 together. While connecting by welding, the fin member 25 and the side wall pipes 21 on both sides thereof are connected by welding. Thereby, the side wall of a boiler furnace is completed.

  The slit 23 is provided in order to prevent the seal fin 22 and the fin member 25 from being distorted due to thermal elongation in the longitudinal direction of the pipe holder 1, and the stop hole 24 is distorted by the thermal elongation. Even if it occurs, it is provided to prevent the crack generated in the fin member 25 from extending due to the distortion.

In the case of a general boiler furnace in which the maximum use temperature and the maximum use pressure of the fluid (water) flowing in the side wall of the boiler furnace, that is, in the pipe 1 and the side wall pipe 21 are 255 ° C. and 2.45 MPa, As an example, the distance l ₁ between the insertion holes provided in the nozzle ₁ = the distance l ₁ ′ between the side wall pipes 21 = 102 mm and the width l ₄ of the side wall pipes = 76 mm, depending on the flow rate of water). it can. At this time, the width l ₃ of the seal fin 22 is 26 mm.

In this case, in order to ensure the functions of the slit 23 and the fin 24, the width l ₁ ″ of the slit 23 can be set to about 3 to 6 mm, and the width l ₁ ″ of the stop hole 24 can be set to 6 mm. Can be about.
The width l ₁ ″ ″ of the stop hole 24 can be adjusted to about 6 mm by adjusting the drill diameter provided for drilling. The width l ₁ ″ of the slit 23 can be adjusted to about 3 to 6 mm by gas cutting. Or the size of the cutting allowance by laser cutting. That is, when the present invention is applied to a commonly used boiler furnace, no special tool or technique is required to adjust the width of the slit 23 or the stop hole 24.

FIG. 5 is an explanatory diagram relating to the welding operation of the pipe holder 1 and the panel 2.
When welding the Yoke 1 and the panel 2 (side wall pipe 21), until the panel 2 is moved above the Yoke 1 and the side wall pipe 21 is inserted into the insertion hole 11 of the Yose 1 and welded, FIG. 5 to stabilize the panel 2 in a state where the panel 2 is erected. The suspension fittings 41 and 42 are provided at positions where the panel 2 can be stabilized in a standing state when the panel 2 is suspended using two suspension fittings. That is, the hanging metal fittings 41 and 42 are provided at two symmetrical positions with respect to the center of the panel in the width direction.

Then, after the panel 2 and the header 1 are joined, a wire is placed on the hanging metal fittings 41 and 44 shown in FIG. 5 to stabilize the joint between the panel 2 and the header 1 in a standing state. Thereafter, the fin member 25 is attached.
Since the center of gravity of the panel 2 is different from that of the panel 2 and the joint between the panel 2 and the header 1, the panel 2 and the joint between the panel 2 and the joint 1 are always kept in a stable state. It is.

  As a result, the panel 2 can always be erected stably during the production of the boiler furnace wall, so that it is not necessary to perform each welding operation manually, and robot welding is possible. Therefore, it is possible to eliminate the possibility of burns due to manual welding and to shorten the welding work. When manual welding and robot welding are compared, manual welding per side wall pipe takes about 12 hours, whereas robot welding only takes about 6 hours, and the process can be greatly shortened.

  By arranging a plurality of side wall pipes in parallel at a predetermined interval, attaching a fin so as to close the interval, and forming a panel, and connecting the plurality of side wall pipes constituting the panel to the nozzle by welding In the manufacturing method of the boiler side wall to be manufactured, the manufacturing method of the boiler side wall having a slit cut from the tip on the side of the pipe side in the seal fin and capable of reducing the working time related to the manufacturing of the boiler side wall is provided. Can do. In addition, a seal fin used for manufacturing the boiler side wall can be provided.

1 Pipe 2 Panel 21 Side wall pipe 22 Seal fin body 23 Slit 24 Stop hole 25 Fin member

Claims (5)

A plurality of side wall pipes are arranged in parallel at a predetermined interval, a panel is formed by attaching fins to the side wall pipes so as to close the interval, and the plurality of side wall pipes constituting the panel are joined by welding. In the manufacturing method of the boiler side wall manufactured by connecting,
The fin comprises a fin body and a fin member provided with a slit,
A panel is formed by attaching a fin body to the side wall pipe so as to close the gap, and after connecting the panel to the pipe,
A method for manufacturing a boiler side wall, wherein the fin member is attached to the tip side of the fin body on the side of the pipe side so that the slit is located on the side of the pipe side.   The method for manufacturing a boiler side wall according to claim 1, wherein a fin member provided with a hole having a diameter larger than the slit width is attached to the end of the fin body side of the slit. . At the upper part of the pipe, the panel is suspended from above in a stable state, and after connecting the panel to the pipe,
The said panel and the joint of the said panel are hung from the upper direction in the state which stood up stably, The said fin member is attached to the said nozzle side tip part of the said fin. Manufacturing method of boiler side wall. A boiler side wall fin that forms a part of a boiler side wall and forms a panel by being attached to the side wall pipe so as to close the gap between a plurality of side wall pipes arranged in parallel at a predetermined interval,
The panel forms a boiler side wall by connecting the plurality of side wall pipes to a nozzle by welding,
The fin is composed of a fin body and a fin member,
The fin body is attached between the side wall pipes so as to close the gap,
A fin for a boiler side wall, wherein the fin member is provided with a slit, and is attached to the distal end portion of the fin body so that the slit is located on the proximal side.   The boiler fin according to claim 4, wherein the fin member is provided with a hole portion having a diameter larger than the slit width and smaller than the fin member width at a front end portion of the slit.

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