Anti-cracking structure of boiler water wall header

Abstract

The utility model discloses an anti-cracking structure of a boiler water-cooled wall header, which comprises a header, a plurality of water-cooled wall tubes are communicated with the header, and fins are connected between adjacent water-cooled wall tubes. A pipe seat is arranged on the header, a water wall pipe is correspondingly connected to the pipe seat, and a variable-diameter pipe section is arranged on the pipe seat; an expansion joint is arranged in the reducing pipe section, and in the expansion joint, the pipe diameter is gradually reduced from the center to the two ends; at least two continuous expansion joints are arranged in the reducing pipe section, and the adjacent expansion joints are in smooth transition connection; an expansion joint is arranged at the top of the tube seat, and one end of the water-cooled wall tube is directly connected to the expansion joint at the top of the tube seat; the fins between the adjacent water-cooled wall tubes are arc-shaped, and the two arc-shaped ends of the fins are connected with the water-cooled wall tubes on the two sides respectively; the arc bending directions of every two adjacent fins are opposite. According to the utility model, the problem that cracks are easy to generate at weak positions of the header tube socket and the fin structure can be solved.

Description

Technical Field

[0001] The utility model relates to the field of water-cooled wall headers, in particular to an anti-cracking structure of a boiler water-cooled wall header. Background Art

[0002] When the boiler load increases or decreases quickly, the load adjustment range is large, or the unit is started or stopped, the outlet header temperature changes slowly and expands slowly, while the water-cooled wall tube temperature changes quickly and expands quickly. The expansion rate of the water-cooled wall tube and its outlet header is inconsistent, causing greater stress at the header tube seat and fins. After multiple starts and stops and load increases or decreases, cracks will occur in the weak structures of the header tube seat and fins. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides an anti-crack structure for a boiler water-cooled wall header, aiming to solve the problem that cracks are easily generated at weak points of the header pipe seat and fin structure.

[0004] Technical solution: To achieve the above-mentioned purpose, the utility model provides an anti-cracking structure for a boiler water-cooled wall header, comprising a header, on which a plurality of water-cooled wall tubes are connected, and fins are connected between adjacent water-cooled wall tubes; a tube seat is provided on the header, and the water-cooled wall tubes are correspondingly connected to the tube seat, and a reducing pipe section is provided on the tube seat; the reducing pipe section has at least two continuous expansion joints, and adjacent expansion joints are smoothly transitioned and connected; in the expansion joint, the pipe diameter gradually decreases from the center to both ends; the fins between adjacent water-cooled wall tubes are arc-shaped, and the arc-shaped ends of the fins are respectively connected to the water-cooled wall tubes on both sides; the arc-shaped bending directions of two adjacent fins are opposite.

[0005] Furthermore, the top of the tube seat is an expansion joint, and one end of the water-cooled wall tube is directly connected to the expansion joint on the top of the tube seat.

[0006] Beneficial effects: The utility model provides an anti-cracking structure for a boiler water-cooled wall header, in which at least two continuous expansion joints are provided on the tube seat, and the two continuous expansion joints have a certain deformation capacity, so that the tube seat is not prone to cracks; the fins are arc-shaped fins, so that the fins also have deformation capacity and are not prone to cracks. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Attachment Figure 1 This is a schematic diagram of the connection between the header and the water-cooled wall tubes;

[0008] Attachment Figure 2 Schematic diagram of the fin structure. DETAILED DESCRIPTION

[0009] The present invention will be further described below in conjunction with the accompanying drawings.

[0010] As attached Figures 1 to 2The anti-cracking structure for a boiler water-wall header includes a header 1, with a plurality of water-wall tubes 2 disposed thereon, communicating with the interior of the header 1. Fins 3 connect adjacent water-wall tubes 2. The header 1 is provided with a plurality of tube sockets 4, each of which is connected to a corresponding tube socket 4 of the header 1. Each tube socket 4 has a reducing pipe section.

[0011] Because the water-wall tubes 2 and header 1 expand at different rates, significant stress is generated at the tube base 4, potentially causing cracks in the tube base 4. However, in the present invention, a reducing pipe section is provided on the tube base 4. Compared to a straight tube, the reducing pipe section has a certain degree of deformation capability, making the tube base 4 less likely to crack under stress.

[0012] An expansion joint 5 is provided in the reducing pipe section. In the expansion joint 5, the pipe diameter gradually decreases from the center of the expansion joint 5 to the two ends of the expansion joint 5. The outer contour surface of the expansion joint 5 is a curved surface, and the expansion joint 5 has a certain bending deformation ability. Figure 1 As shown in , there are at least two consecutive expansion joints 5 in the reducer section, and the continuous expansion joints 5 are shaped like a candied haws when connected. Adjacent expansion joints 5 are connected by a smooth transition of an arc structure. Due to the continuous expansion joints 5, the deformation capacity of the reducer section can be further improved, and the tube seat 4 is less likely to crack. The bottom of the tube seat 4 is connected to the header 1, and the top of the tube seat 4 is connected to the water-cooled wall tube 2. The top of the tube seat 4 is the expansion joint 5, and one end of the water-cooled wall tube 2 is directly connected to the expansion joint 5 at the top of the tube seat 4. Specifically, the water-cooled wall tube 2 can be connected to the expansion joint 5 at the top of the tube seat 4 by welding.

[0013] As attached Figure 2 As shown in FIG, the fins 3 between adjacent water-wall tubes 2 are arc-shaped, with the two ends of the arc connecting the water-wall tubes 2 on either side. This gives the fins 3 a certain degree of deformation, making them less susceptible to cracking. The arcs of two adjacent fins 3 bend in opposite directions. When the fins 3 deform, the force applied to the entire water-wall tube 2 is more even, making the connection between the fins 3 and the water-wall tube 2 more stable.

[0014] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A crack prevention structure for a boiler water wall header, characterized by: The invention comprises a header (1), a plurality of water-cooled wall tubes (2) are connected and arranged on the header (1), and fins (3) are connected between adjacent water-cooled wall tubes (2); a tube seat (4) is arranged on the header (1), the water-cooled wall tubes (2) are correspondingly connected to the tube seat (4), and a reducing pipe section is provided on the tube seat (4); There are at least two continuous expansion joints (5) in the variable diameter pipe section, and adjacent expansion joints (5) are smoothly transitionally connected; in the expansion joints (5), the pipe diameter gradually decreases from the center to both ends; The fins (3) between adjacent water-cooled wall tubes (2) are arc-shaped, and the two ends of the arc of the fin (3) are respectively connected to the water-cooled wall tubes (2) on both sides; the arc bending directions of two adjacent fins (3) are opposite.

2. The anti-cracking structure of a boiler water wall header according to claim 1, characterized in that: The top of the tube seat (4) is an expansion joint (5), and one end of the water-cooled wall tube (2) is directly connected to the expansion joint (5) on the top of the tube seat (4).

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