Flue gas pipeline connection transition structure

Abstract

The utility model discloses a flue gas pipeline connection transition structure, which relates to the technical field of pipeline connection, and comprises at least two reducing sections capable of being spliced into a closed loop, each reducing section comprises a first plane end extending along the X-axis direction and a second plane end extending along the Y-axis direction, the first plane end is connected with the second plane end through a bending area, and the bending area is connected with the first plane end. The first plane end of each reducing section is connected with the second plane end of the adjacent reducing section through a first splicing welding seam. The pipeline has the beneficial effects that by changing the position of the first splicing welding seam between the adjacent reducing sections, a natural bending line and a weak bending area are avoided, the stress condition of the first splicing welding seam is greatly reduced, the welding quality is improved, and the service life of the pipeline is prolonged; and the two ends of the reducing section are welded to the first short section and the second short section correspondingly, and when the pipeline is welded, a butt welding or vertical angle welding mode is adopted, so that the welding quality is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline connection, in particular to a connecting and transitional structure for a flue gas pipeline. Background Art

[0002] In engineering structure design, it is often necessary to connect pipelines with different cross-sectional shapes through specific structures. For example, a square-to-round structure is used to connect a pipeline with a square cross-section and a pipeline with a circular cross-section. Traditional square-to-round structures are relatively large in size, and are usually fabricated by piecewise pressing (rolling) and then assembled by welding. The splicing weld is usually the natural bending line of the square-to-round structure. When the flue gas temperature is relatively high, the square-to-round structure is thermally deformed. Due to the change in shape at the natural bending line, stress is prone to concentration, and it is relatively fragile itself. In addition, the intersection points of the splicing welds at the bending part and the four corners of the rectangular end are often prone to cracking. Moreover, since the components such as SO2 and SO3 contained in the flue gas will corrode metals, the welding performance of the metals will decline, and the repaired cracks at the welds will often crack again. To solve this problem, it is necessary to improve the splicing and welding method of the traditional square-to-round structure. Content of the Utility Model

[0003] This part aims to outline some aspects of the embodiments and briefly introduce some preferred embodiments. In this part, as well as in the abstract of the specification and the title of the utility model of this application, some simplifications or omissions may be made to avoid obscuring the purpose of this part, the abstract of the specification and the title of the utility model, and such simplifications or omissions shall not be used to limit the scope of the utility model.

[0004] In view of the problems existing in the above or the prior art, the present utility model is proposed, which can solve the technical problem that the splicing welds located at the natural bending line are prone to cracking.

[0005] To solve the above technical problems, the present utility model provides the following technical solution: a connecting and transitional structure for a flue gas pipeline, which includes at least two reduced-diameter sections that can be spliced into a closed loop. The reduced-diameter section includes a first planar end extending along the X axis and a second planar end extending along the Y axis. The first planar end and the second planar end are connected through a bending region. The first planar end of each reduced-diameter section is connected to the second planar end of its adjacent reduced-diameter section through a first splicing weld.

[0006] As a preferred solution of the connecting and transitional structure for a flue gas pipeline described in the present utility model, wherein: the upper and lower end faces of the reduced-diameter section are both parallel to the XY plane, and the two ends of the reduced-diameter section are respectively connected with a first short section and a second short section.

[0007] As a preferred solution of a flue gas pipeline connection and transition structure of the present utility model, the following applies: There are four reducing sections. After the four reducing sections are closed to each other, a circular end and a rectangular end are formed. The circular end is correspondingly connected to the first short section, and the rectangular end is correspondingly connected to the second short section.

[0008] As a preferred solution of a flue gas pipeline connection and transition structure of the present utility model, the following applies: The second short section includes a second splicing weld. The distance between the second splicing weld and each corner of the second short section is greater than 100 mm.

[0009] As a preferred solution of a flue gas pipeline connection and transition structure of the present utility model, the following applies: The rectangular end is a rounded rectangle.

[0010] As a preferred solution of a flue gas pipeline connection and transition structure of the present utility model, the following applies: One end of the reducing sections located at one end of the second short section after being closed to each other is a hexagon.

[0011] The beneficial effects of the present utility model are as follows: By changing the position of the first splicing weld between adjacent reducing sections, the natural bending line and the relatively weak bending area are avoided, greatly reducing the stress on the first splicing weld, improving the welding quality and the service life of the pipeline; The two ends of the reducing sections are respectively welded to the first short section and the second short section. When the square-to-round structure is integrally welded to the rectangular equipment opening and the circular flue gas pipeline, butt welding or vertical fillet welding is used to further improve the welding quality; The four corners of the rectangular end of the square-to-round structure are rounded, so that the natural bending lines no longer converge at one point, avoiding stress concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. The following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative and laborious efforts. Among them:

[0013] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0014] Figure 2 It is a schematic diagram of the disassembled structure of the present utility model;

[0015] Figure 3 It is a schematic diagram of the structure of the reducing section of the present utility model;

[0016] Figure 4 It is a front view of the present utility model;

[0017] Figure 5 It is a top view of the present utility model;

[0018] Figure 6 Front view of the traditional square-to-round structure;

[0019] Figure 7 Top view of the traditional square-to-round structure.

[0020] Meanings of the reference numerals in the figure: 1, diameter-changing section; 2, first short section; 3, second short section; 4, natural bending line; 5, first splicing weld; 6, second splicing weld; 101, first flat end; 102, second flat end. Detailed implementation manners

[0021] To make the above objects, features and advantages of the present utility model more obvious and understandable, the following detailed description of the specific implementation manners of the present utility model will be given with reference to the accompanying drawings of the specification.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. The so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present utility model. The "in one embodiment" that appears in different places in this specification does not all refer to the same embodiment, nor is it an individual or selectively exclusive embodiment with other embodiments. Embodiment

[0023] Referring to Figures 1 to 5 , which is the first specific embodiment of the present utility model. This embodiment provides a flue gas pipeline connection and transition structure, which includes at least two diameter-changing sections 1 that can be spliced into a closed loop. The diameter-changing section 1 includes a first flat end 101 extending along the X axis and a second flat end 102 extending along the Y axis. The first flat end 101 and the second flat end 102 are connected through a bending area. The first flat end 101 of each diameter-changing section 1 is connected to the second flat end 102 of its adjacent diameter-changing section 1 through a first splicing weld 5; the upper and lower end faces of the diameter-changing section 1 are both parallel to the XY plane. The two ends of the diameter-changing section 1 are respectively connected with a first short section 2 and a second short section 3. There are four diameter-changing sections 1. After the four diameter-changing sections 1 are closed to each other, a circular end and a rectangular end are formed. The circular end is correspondingly connected to the first short section 2, and the rectangular end is correspondingly connected to the second short section 3.

[0024] Such as Figure 3As described above, the area formed by the dotted line is the bending area, and the center position of the bending area is the natural bending line 4. The first splicing weld 5 avoids the natural bending line 4. When the flue gas temperature is high, the first splicing weld 5 is not easily deformed by heat. The reducer section 1 is divided into four pieces and rolled and then welded and assembled. The splicing weld is arranged at the midline position of the four planes of front, back, left and right. The circular end of the reducer section 1 is welded with the first short section 2, and the rectangular end of the reducer section 1 is welded with the second short section 3. Bevels are provided at the welding points. The bevels can increase the contact area during welding and allow the welding material to be better filled, thereby significantly improving the welding quality and enhancing the firmness and sealing of the welding points.

[0025] When the entire structure is subjected to various stresses in actual use, the first joint weld 5 located on the symmetry plane can evenly disperse the stress, thereby effectively reducing the stress on the weld and greatly improving the stability of the weld and the durability of the entire structure.

[0026] The second short section 3 includes a second splicing weld 6, and the distance between the second splicing weld 6 and each corner of the second short section 3 is greater than 100 mm; the rectangular end is a rounded rectangle.

[0027] The second splicing weld 6 has a large distance from each corner of the second short section 3, which can avoid the stress concentration at the corners and cause adverse effects on the weld, and ensure that the weld will not have problems such as cracks due to the interference of corner stress during use; at the same time, the rectangular end is designed to be a rounded rectangle. In the actual structure, if the rectangular end is a right-angled rectangle, then the natural bending lines 4 at the corners will converge at one point to form a weak area. The design of a rounded rectangle can effectively avoid the above-mentioned problem, so that the stress can be more evenly distributed in various parts of the rectangular end, further enhancing the strength and stability of the entire square-to-round structure. Example

[0028] The second specific embodiment of the utility model is different from the first embodiment in that: after the reducing sections 1 are closed together, one end of the second short section 3 is hexagonal.

[0029] The multiple sides of the hexagon can provide a wider connection surface, increase the stability of the connection, and can evenly distribute the stress to each side and connection point when subjected to force, effectively reducing the occurrence of local stress concentration, ensuring that the entire square-to-round structure can operate stably and reliably in the complex working environment of the high-temperature flue gas pipeline of the sulfuric acid plant, extending its service life and improving work efficiency.

[0030] Working principle: First, the reducing section 1 is welded in sequence to form a closed square-to-circle structure, the first short section 2 is welded to the circular end of the square-to-circle structure, and then the second short section 3 is welded in a closed manner, and then the closed second short section 3 is welded to the rectangular end of the square-to-circle structure to form a complete square-to-circle structure.

[0031] Advantages of the present application over the prior art: By changing the position of the first splicing weld 5 between adjacent reduced-diameter sections 1, the natural bending line 4 and the relatively weak bending area are avoided, greatly reducing the stress on the first splicing weld 5 and improving the welding quality and the service life of the pipeline; both ends of the reduced-diameter section 1 are welded to the first short section 2 and the second short section 3 respectively. When the square-to-round structure as a whole is welded to the rectangular equipment opening and the circular flue gas pipeline, butt welding or vertical fillet welding is adopted to further improve the welding quality; the four corners of the rectangular end of the square-to-round structure are rounded, so that the natural bending line 4 no longer converges at one point, avoiding stress concentration.

[0032] Importantly, although only a few embodiments are described in detail in this disclosure, those skilled in the art who refer to this disclosure should easily understand that many modifications are possible without substantially departing from the subject matter described in this application (for example, the dimensions, scales, structures, shapes and proportions of various components, as well as parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, color, orientation changes, etc.). For example, an element shown as integrally formed may be composed of multiple parts or elements, and the position of the element may be inverted or otherwise changed. Therefore, all such modifications should be included within the scope of the present utility model. In the claims, any "means-plus-function" clause should cover the structure performing the recited function described herein. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangements of the exemplary embodiments without departing from the scope of the present utility model. Therefore, the present utility model is not limited to specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

Claims

1. A connecting and transitional structure for a flue gas pipeline, characterized in that: It includes at least two reduced-diameter sections (1) that can be spliced into a closed loop. The reduced-diameter section (1) includes a first planar end (101) extending along the X axis and a second planar end (102) extending along the Y axis. The first planar end (101) and the second planar end (102) are connected through a bending region. The first planar end (101) of each reduced-diameter section (1) is connected to the second planar end (102) of its adjacent reduced-diameter section (1) through a first splicing weld (5).

2. The flue gas pipeline connection and transition structure according to claim 1, characterized in that: The upper and lower end faces of the reduced-diameter section (1) are both parallel to the XY plane. A first short section (2) and a second short section (3) are respectively connected to both ends of the reduced-diameter section (1).

3. The flue gas pipeline connection and transition structure according to claim 1 or 2, characterized in that: There are four reduced-diameter sections (1). After the four reduced-diameter sections (1) are mutually closed, a circular end and a rectangular end are formed. The circular end is correspondingly connected to the first short section (2), and the rectangular end is correspondingly connected to the second short section (3).

4. The flue gas pipeline connection and transition structure according to claim 3, wherein: The second short section (3) includes a second splicing weld (6). The distance between the second splicing weld (6) and each corner of the second short section (3) is greater than 100 mm.

5. The flue gas pipeline connection and transition structure according to claim 4, wherein: The rectangular end is a rounded rectangle.

6. The flue gas pipeline connection and transition structure according to claim 2, characterized in that: One end of the reduced-diameter sections (1) located at the second short section (3) after being mutually closed is a hexagon.

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