JP5936523B2 - Twin-body self-supporting boiler - Google Patents

Description

  The present disclosure relates to a two-cylinder self-supporting boiler having an increased strength in the vicinity of a base portion of a side wall evaporation pipe in order to cope with an increase in the size of a boiler structure.

  Since the twin-boiler boiler has more evaporating tubes than the single-boiler boiler, it is suitable as a boiler that processes low-calorie gas such as CO gas generated in the petroleum refining process. In recent years, with an increase in capacity of a fluid bed type catalytic cracker installed on the upstream side of a boiler, there is an increasing need for an enlargement of a two-cylinder self-supporting boiler with a large amount of processing gas.

  Patent Document 1 discloses an invention relating to a two-cylinder self-supporting boiler having an increased strength in the vicinity of a nozzle of a water drum in order to cope with an increase in the size of a boiler structure.

JP 2012-132609 A

  However, simply increasing the strength in the vicinity of the nozzle of the water drum is not sufficient as a measure for further increasing the size of the two-body self-supporting boiler.

  At least one embodiment of the present invention has been made in view of such circumstances, and an object thereof is to provide a two-cylinder self-supporting boiler that can cope with an increase in the size of a boiler structure.

In order to achieve the above-described object, at least one embodiment of the two-body self-supporting boiler according to the present invention is provided.
A steam drum arranged laterally;
An upper header pipe arranged extending in a direction orthogonal to the axial direction of the steam drum;
A water drum disposed laterally opposite the lower side of the steam drum;
A lower header pipe that extends in a direction orthogonal to the axial direction of the water drum, and is disposed opposite to the lower header pipe;
The upper header pipe and the lower header pipe extend in the vertical direction, and both ends thereof are joined to the upper header pipe and the lower header pipe, and the axial direction of the upper header pipe and the lower header pipe A two-sided self-supporting boiler provided with a plurality of side wall evaporator tubes arranged in parallel along
A reinforcing plate made of a pair of plate-shaped reinforcing pads that sandwich the plurality of side wall evaporation tubes arranged in parallel is provided at the lower end of the plurality of side wall evaporation tubes.

  According to such a two-cylinder self-supporting boiler, from the pair of plate-shaped reinforcing pads that sandwich the plurality of side wall evaporator tubes arranged in parallel at the lower end portion of the side wall evaporator tube on which the load of the entire boiler structure acts. Since the reinforcing plate is provided, it is possible to prevent in advance bending deformation at the lower end portion of the side wall evaporation pipe, which will become apparent in the future as the boiler structure increases in size.

In one embodiment of the present invention,
The reinforcing plate is provided in a range from a joint portion between the side wall evaporation pipe and the lower header pipe to a furnace bottom of a combustion chamber located above the lower header pipe.

  According to such a configuration, the side wall evaporation can be performed by providing the reinforcing plate in the range from the joint portion with the lower header pipe where the risk of bending deformation is high, to the bottom of the combustion chamber, in the lower end portion of the side wall evaporation pipe. The tube can be effectively reinforced.

In one embodiment of the present invention,
When the reinforcing plate assumes two influence lines that form an angle of 45 degrees with respect to the horizontal direction in the direction away from the support member from both ends of the support surface of the support member that supports the lower header pipe in the vertical direction. Are provided between the side wall evaporation tubes included between the two influence lines.

  According to such a configuration, among the plurality of side wall evaporation pipes arranged in parallel, the reinforcing plate is provided in the side wall evaporation pipe that is located within the range of influence of the reaction force and particularly has a high risk of bending deformation, The side wall evaporation pipe can be effectively reinforced.

In one embodiment of the present invention,
A back stay extending in a direction parallel to the axial direction of the water drum and supporting the furnace bottom of the combustion chamber, and a support column supporting the back stay are provided.

  According to such a configuration, it is possible to effectively suppress the deflection of the furnace bottom of the combustion chamber, which is considered to be actualized with an increase in the size of the boiler structure. Combined with the reinforcing plate, it can contribute to the enlargement of the boiler structure.

  According to at least one embodiment of the present invention, by providing a reinforcing plate for connecting and fixing adjacent side wall evaporation pipes at the lower end of the side wall evaporation pipes, a two-barrel type capable of coping with an increase in the size of the boiler structure. A self-supporting boiler can be provided.

1 is an overall perspective view of a two-barrel self-supporting boiler according to an embodiment of the present invention. FIG. 2 is an overall side view of a two-cylinder self-supporting boiler as viewed from the direction A in FIG. 1. It is aa sectional drawing of Drawing 2, and is a figure showing the section structure of the lower end part of the side wall evaporation pipe in one embodiment of the present invention. It is bb sectional drawing of FIG. It is the schematic sectional drawing which showed the result of the structural analysis simulation which the present inventors performed. FIG. 3 is an enlarged view of a part c shown in FIG. 2. FIG. 3 is an enlarged view of a portion d illustrated in FIG. 2. It is BB sectional drawing of FIG. It is a longitudinal cross-sectional view of the backstay shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
However, the scope of the present invention is not limited to the following embodiments. The dimensions, materials, shapes, relative arrangements, and the like of the component parts described in the following embodiments are not merely intended to limit the scope of the present invention, but are merely illustrative examples.

FIG. 1 is an overall perspective view of a two-barrel self-supporting boiler according to an embodiment of the present invention. FIG. 2 is an overall side view of the two-cylinder self-supporting boiler as viewed from the direction A in FIG.
As shown in FIG. 1, the two-cylinder self-supporting boiler 1 of the present embodiment is disposed in a lateral direction so as to face a lower side of the steam drum 2 and a steam drum 2 provided in the upper direction in the lateral direction. Two drums of water drum 4 are provided. In addition, a large number of heat transfer tubes 6 connected between the steam drum 2 and the water drum 4 are connected in the axial direction and the circumferential direction of the two drums.

  The two-barrel self-supporting boiler 1 includes a pair of left and right side pipe walls 20, 20, a front pipe wall 30, a ceiling pipe wall 40, and a furnace bottom pipe wall 50, and the inside of the boiler structure is formed by these pipe walls. A combustion chamber 10 is defined. That is, the ceiling tube wall 40 constitutes the furnace top of the combustion chamber 10, and the furnace bottom tube wall 50 constitutes the furnace bottom of the combustion chamber 10. The side tube walls 20, 20 and the front tube wall 30 are reinforced by a backstay 29.

  In addition, a pair of upper header pipes 12 a and 12 b extend in the direction perpendicular to the axial direction of the steam drum 2 at the top of the two-barrel self-supporting boiler 1. The pair of upper header tubes 12a and 12b extend in the lateral direction in parallel to each other. Further, the upper header pipes 12a and 12b are connected to the steam drum 2 through the rising pipes 22a and 22b. And the vapor | steam supplied from the side wall evaporation pipe 26 mentioned later is supplied to the vapor | steam drum 2 via the riser pipes 22a and 22b.

  In addition, a pair of lower header pipes 14 a and 14 b extend in a direction orthogonal to the axial direction of the water drum 4 at the lower part of the two-barrel self-supporting boiler 1. The pair of lower header tubes 14a, 14b extend in the lateral direction in parallel to each other. Further, the lower header pipes 14a and 14b are connected to the water drum 4 via distribution pipes 24a and 24b. The water collected from the water drum 4 via the distribution pipes 24 a and 24 b is supplied to the side wall evaporation pipe 26.

  Further, as shown in FIG. 1, these lower header pipes 14a and 14b are supported by the bases 32, 34 and 36, 38 at both ends. In addition, since the base stand 38 and the distribution pipe 24b which support the lower header pipe | tube 14b are located in the back back side of the two cylinder self-supporting boiler 1, they are not displayed in FIG.

  Further, the side wall evaporation pipe 26 described above extends in the vertical direction between the upper header pipes 12a, 12b and the lower header pipes 14a, 14b. As shown in FIG. 2, the side wall evaporation pipe 26 is joined at both ends to the upper header pipe 12a and the lower header pipe 14a and in parallel along the axial direction of the upper header pipe 12a and the lower header pipe 14a. Several are arranged. Inside the side wall evaporation pipe 26, water is evaporated by the heat supplied from the combustion chamber 10 to generate steam. And the vapor | steam produced | generated in the side wall evaporation pipe 26 goes up, and is supplied to the upper header pipes 12a and 12b.

  4 is a cross-sectional view taken along line bb of FIG. 2 and shows a cross-sectional view of the side tube wall 20. As shown in FIG. 4, the side wall evaporation pipes 26 are arranged in a state of being separated from each other by a predetermined distance. A plate-like seal fin 20a is welded between the adjacent side wall evaporation pipes 26, whereby the combustion chamber 10 is formed.

  Moreover, the lower side (aa cross section of FIG. 2) rather than the furnace bottom (furnace bottom pipe wall 50) of the combustion chamber 10 also has the same cross-sectional structure as the side pipe wall 20 shown in FIG. However, in order to cope with further enlargement of the two-body self-supporting boiler 1, particularly the enlargement of the boiler structure in consideration of earthquake resistance, reinforcement is particularly made to the side wall evaporation pipe 26 below the furnace bottom. The inventors have found that there is a need to do.

  FIG. 5 is a schematic cross-sectional view showing the result of the structural analysis simulation performed by the present inventors. As shown in FIG. 5, when the horizontal force F caused by the earthquake acts on the boiler structure, as shown in FIG. 5B, particularly between the lower header pipe 14b and the furnace bottom (furnace bottom pipe wall 50). The present inventors have found that the side wall evaporation pipe 26 at the bottom may be greatly deformed.

  Therefore, in at least one embodiment of the present invention, as shown in FIG. 3, a reinforcing plate 28 for connecting and fixing adjacent side wall evaporation pipes 26, 26 to the lower end portion of the side wall evaporation pipe 26 extending in the vertical direction is provided. By providing, the intensity | strength increase of the lower end part of the side wall evaporation pipe 26 is aimed at.

  Specifically, as shown in FIG. 3, the reinforcing plate 28 may be configured by a pair of plate-like reinforcing pads 28 a and 28 a disposed to face both sides of the above-described seal fin 20 a. In this case, a pair of reinforcing pads 28a, 28a are arranged so as to sandwich a plurality of side wall evaporation pipes 26 arranged in parallel, and fixed to the side wall evaporation pipes 26 by a method such as welding, whereby the reinforcing plate 28 is fixed. Configure. If comprised in this way, in addition to the sealing fin 20a mentioned above, the lower end part of the side wall evaporation pipe 26 can be reinforced more firmly by a pair of plate-shaped reinforcement pads 28a and 28a which clamp the side wall evaporation pipe 26. I can do it.

  The reinforcing plate 28 may be installed in the following installation range. 6 is an enlarged side view of part c shown in FIG. 2, and FIG. 7 is an enlarged side view of part d shown in FIG. 6 and 7 indicate a range where the reinforcing plate 28 is installed.

  As shown in FIGS. 6 and 7, the reinforcing plate 28 is provided at the furnace bottom (furnace bottom) of the combustion chamber 10 located above the lower header pipe 14a from the joint j between the side wall evaporation pipe 26 and the lower header pipe 14a. It is provided in the range up to the tube wall 50). In this manner, among the lower end portions of the side wall evaporation pipe 26, the reinforcing plate 28 is provided in a range from the joint portion j to the lower header pipe 14a, which has a particularly high risk of bending deformation, to the furnace bottom of the combustion chamber 10. The sidewall evaporation pipe 26 can be effectively reinforced.

  Further, the reinforcing plate 28 is installed on the upper surface of the base 32, and from both ends of the support surface 60a of the support base 60 (support member) that supports the lower header pipe 14a in the vertical direction, in the axial direction of the lower header pipe 14a, Assuming two influence lines α and α that form an angle of 45 degrees in the direction away from the support base 60 with respect to the horizontal direction, the lower header pipe 14a and the two influence lines α and α Are provided on the side wall evaporation pipe 26 including the connection point j. The reinforcing plate 28 is not provided between the side wall evaporation pipes 26 ′ and 26 ′ that do not include the connection portion j with the lower header pipe 14 a between the influence lines α and α.

  In this way, among the plurality of side wall evaporation pipes 26 arranged in parallel, the reinforcing plate 28 is provided in the side wall evaporation pipe 26 which is located within the reaction force influence range and has a high risk of bending deformation. The side wall evaporation pipe 26 can be effectively reinforced.

  In FIGS. 6 and 7, the case where three support bases 60 are provided on the base base 32 as support members for supporting the lower header pipe 14 a has been described as an example. The both ends of the support surface in that case are grasped as the left end of the left support base 60 and the right end of the right support base 60, as shown in FIG. On the other hand, when the lower header pipe 14a is directly supported by the base 34, the influence lines α and α are assumed with both ends of the contact portion where the lower header pipe 14a and the base 34 are in contact as both support surfaces. That's fine.

  As shown in FIGS. 6 and 7, the side wall evaporation pipe 26 is reduced in diameter at its lower end and joined to the lower header pipe 14a. The diameter of the side wall evaporation pipe 26 is reduced in order to prevent the strength of the lower header pipe 14a from being lowered due to the formation of openings close to the lower header pipe 14a in parallel. This is because it is necessary to secure a distance. When the side wall evaporation pipe 26 is reduced in diameter at the lower end in this way, the joint portion j with the lower header pipe 14a becomes a structural weak point, and thus it is particularly effective to provide the reinforcing plate 28 as described above. Is.

  8 is a BB cross-sectional view of FIG. 1, and FIG. 9 is a vertical cross-sectional view of the backstay shown in FIG. In the two-barrel self-supporting boiler 1 according to one embodiment of the present invention, as shown in FIG. 8, it extends in a direction parallel to the axial direction of the water drum 4 and constitutes the furnace bottom of the combustion chamber 10. For example, two backstays 39 for supporting the furnace bottom tube wall 50 are provided. The backstay 39 is constituted by, for example, two large and small H-shaped steels 39a and 39b combined vertically.

  Further, as shown in FIG. 9, in the longitudinal direction of the back stay 39, two support columns 37 that support the back stay 39 including the leg portion 37 a and the base portion 37 b are arranged. If comprised in this way, the backstay 39 and the support | pillar 37 which supports this will bend the bottom of the furnace (furnace bottom pipe wall 50) of the combustion chamber 10 considered to become evident with the enlargement of a boiler structure. Since it can suppress effectively, it can contribute to the enlargement of a boiler structure combined with the reinforcement board 28 mentioned above.

  In addition, the number of the above-mentioned backstay 39 and the support | pillar 37 is not specifically limited. It can be arbitrarily changed according to the shape of the two-barrel self-supporting boiler 1 or the arrangement situation of incidental facilities installed on the lower surface of the boiler.

  As mentioned above, although the preferable form of this invention was demonstrated, this invention is not limited to said form, A various change in the range which does not deviate from the objective of this invention is possible.

  At least one embodiment of the present invention can prevent in advance bending deformation at the lower end portion of the side wall evaporation pipe, which is expected to become apparent in the future as the boiler structure increases in size. It can contribute to enlargement.

DESCRIPTION OF SYMBOLS 1 Two-barrel self-supporting boiler 2 Steam drum 4 Water drum 6 Heat transfer pipe 10 Combustion chambers 12a and 12b Upper header pipe 14a and 14b Lower header pipe 20 Side pipe wall 20a Seal fin 22a Rising pipe 26 and 26 'Side wall evaporation pipe 28 Reinforcement plate 28a Reinforcement pad 29 Back stay 30 Front pipe wall 32, 34, 36, 38 Foundation base 37 Post 37a Leg 37b Foundation 39 Back stay 39a, 39b H-section steel,
40 ceiling tube wall 50 furnace bottom tube wall 60 support stand 60a support surface

Claims (3)

A steam drum arranged laterally;
An upper header pipe arranged extending in a direction orthogonal to the axial direction of the steam drum;
A water drum disposed laterally opposite the lower side of the steam drum;
A lower header pipe that extends in a direction orthogonal to the axial direction of the water drum, and is disposed opposite to the lower header pipe;
The upper header pipe and the lower header pipe extend in the vertical direction, and both ends thereof are joined to the upper header pipe and the lower header pipe, and the axial direction of the upper header pipe and the lower header pipe A two-sided self-supporting boiler provided with a plurality of side wall evaporator tubes arranged in parallel along
Provided at the lower end of the plurality of side wall evaporation pipes is a reinforcing plate comprising a pair of plate-like reinforcing pads that sandwich the plurality of side wall evaporation pipes arranged in parallel,
The reinforcing plate is provided in a range from a joint portion between the side wall evaporation pipe and the lower header pipe to a furnace bottom of a combustion chamber located above the lower header pipe,
The reinforcing plate assumes two influence lines that form an angle of 45 degrees with respect to the horizontal direction in the direction away from the supporting member from both ends of the supporting surface of the supporting member that supports the lower header pipe in the vertical direction. And a two-cylinder self-supporting boiler provided between the side wall evaporation pipes included between the two influence lines. A steam drum arranged laterally;
An upper header pipe arranged extending in a direction orthogonal to the axial direction of the steam drum;
A water drum disposed laterally opposite the lower side of the steam drum;
A lower header pipe that extends in a direction orthogonal to the axial direction of the water drum, and is disposed opposite to the lower header pipe;
The upper header pipe and the lower header pipe extend in the vertical direction, and both ends thereof are joined to the upper header pipe and the lower header pipe, and the axial direction of the upper header pipe and the lower header pipe A two-sided self-supporting boiler provided with a plurality of side wall evaporator tubes arranged in parallel along
Provided at the lower end of the plurality of side wall evaporation pipes is a reinforcing plate comprising a pair of plate-like reinforcing pads that sandwich the plurality of side wall evaporation pipes arranged in parallel,
When the reinforcing plate assumes two influence lines that form an angle of 45 degrees with respect to the horizontal direction in the direction away from the support member from both ends of the support surface of the support member that supports the lower header pipe in the vertical direction. And a two-cylinder self-supporting boiler provided between the side wall evaporation pipes included between the two influence lines. Extending in a direction parallel to the axial direction of the water drum, the back stay for supporting the furnace bottom of the combustion chamber, according to claim 1, characterized in that a strut for supporting the back stay Double-barrel self-supporting boiler.

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