Structure for preventing metal expansion joint at upper part of overheating shield from being torn
By fixing a limit frame on the upper container of the water-cooled wall of the boiler side wall, the outlet pipe of the overheating screen is connected to the connecting pipe through the limit port, the problem of metal expansion joint tearing due to the movement of the overheating screen is solved, ensuring that the boiler is safe and stable operation.
Patent Information
- Application Number
- CN202420414742.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-05
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-03-05
AI Technical Summary
In the existing boiler structure, the metal expansion joints tear due to the movement of the overheating screen, affecting the safe operation of the boiler.
A structure is designed to prevent tearing of metal expansion joints on the upper part of the overheating screen. By fixing a limit frame on the upper part of the side wall water-cooled wall, and opening a limit port on the limit frame, the overheating screen outlet pipe passes through the limit. The position port is connected to the connecting pipe.
It effectively prevents the connecting pipe from moving the overheating screen toward the front of the furnace, thereby preventing the metal expansion joint from tearing and ensuring the safe and stable operation of the boiler.
Smart Images
Figure CN222503814U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of boiler structures, in particular to a structure for preventing a metal expansion joint on an upper part of an overheating screen from tearing. Background Art
[0002] The common layout of the metal expansion joint on the boiler superheater is shown in Figure 1 . Since the temperature of the medium (steam) in the superheater 1 is higher than the temperature of the medium (steam-water mixture) in the water-cooled wall tube, the expansion amounts of the two are different. The connection method between the superheater and the front wall water-cooled wall 3 at the superheater inlet header is welding, so this connection point is a fixed point. When the superheater and the water-cooled wall are at the same height in the cold state, there will be a height difference due to the different expansion amounts in the hot state. Therefore, a metal expansion joint 2 is used at the seal between the superheater 1 and the upper part of the furnace to compensate for the difference in expansion between the water-cooled wall and the superheater. There is a connecting pipe 7 between the superheater outlet and the high-temperature superheater inlet header 8. When the boiler is running, this section of the pipe will expand due to the high-temperature medium. The general horizontal expansion amount is about 40~50mm. The position of the high-temperature superheater is relatively fixed. The connecting pipe will push the superheater toward the front of the furnace due to expansion. This movement will cause the superheater 1 to be relatively displaced relative to the front wall water-cooled wall 3, thereby causing the metal expansion joint 2 to tear, see Figure 2 As shown, it affects the safe operation of the boiler. Summary of the invention
[0003] In order to solve the problem that the existing metal expansion joints are torn due to the movement of the overheating screen, thus affecting the safe operation of the boiler, the utility model provides a structure to prevent the metal expansion joints on the upper part of the overheating screen from tearing, which can ensure that the metal expansion joints on the upper part of the overheating screen will not be torn due to the movement of the overheating screen caused by the expansion of the connecting pipeline, thereby ensuring the safe and stable operation of the boiler.
[0004] The technical solution is as follows: a structure for preventing the tearing of the metal expansion joint on the upper part of the overheating screen, which includes an overheating screen and a front wall water-cooled wall, wherein a metal expansion joint is arranged at the sealing part between the overheating screen and the front wall water-cooled wall, the upper header of the overheating screen is connected to the high-temperature superheater inlet header via an outlet pipe and a connecting pipe, and an upper header of the side wall water-cooled wall is arranged above the front wall water-cooled wall, characterized in that a limiting frame is fixed on the upper header of the side wall water-cooled wall, a limiting opening is provided on the limiting frame, the outlet pipe of the overheating screen passes through the limiting opening and is connected to one end of the connecting pipe, and the other end of the connecting pipe is connected to the high-temperature superheater inlet header.
[0005] After adopting the utility model, the connection form between the superheater and the high-temperature superheater header is changed, and the superheater outlet pipe is allowed to pass through the limiting opening on the limiting frame. When expansion occurs, the superheater outlet pipe is limited by the limiting device, which can prevent the metal expansion joint from being torn due to the movement of the superheater caused by the expansion of the connecting pipeline, thereby ensuring the safe and stable operation of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS
[0006] Figure 1 It is a schematic diagram of the prior art structure;
[0007] Figure 2 for Figure 1 Schematic diagram of the relative displacement of the middle superheating screen relative to the front water-cooled wall;
[0008] Figure 3 It is a schematic diagram of the structure of the utility model;
[0009] Figure 4 for Figure 3 Side view;
[0010] Figure 5 for Figure 3 Top view. DETAILED DESCRIPTION
[0011] See Figure 3 , Figure 4 , Figure 5 As shown, a structure for preventing the tearing of the metal expansion joint on the upper part of the superheater is shown, which includes a superheater 1 and a front wall water-cooled wall 3, a metal expansion joint 2 is arranged at the sealing position between the superheater 1 and the front wall water-cooled wall 3, the upper header of the superheater 1 is connected to the high-temperature superheater inlet header 8 through an outlet pipe 4 and a connecting pipe 7, an upper header 6 of the side wall water-cooled wall is arranged above the front wall water-cooled wall 3, a limiting frame 5 is fixed on the upper header 6 of the side wall water-cooled wall, a limiting opening is provided on the limiting frame 5, the superheater outlet pipe 4 passes through the limiting opening and is connected to one end of the connecting pipe 7, and the other end of the connecting pipe 7 is connected to the high-temperature superheater inlet header 8.
[0012] The superheating screen outlet pipe 4 is limited by the pipe limit frame 5, which is installed on the upper header 6 of the side wall water-cooled wall. The limit frame 5 can effectively prevent the connecting pipe 7 from pushing the superheating screen 1 to move toward the front of the furnace, thereby preventing the expansion joint in the metal expansion joint 2 from tearing. After adopting this structure, the superheating screen 1 will only have a very small displacement relative to the front wall water-cooled wall 3, and the displacement is equal to the expansion of the section of the pipe from the superheating screen outlet header to the limit frame 5, minus the expansion of the front wall water-cooled wall 3 of the length corresponding to the position of this section of the pipe. This difference in expansion is caused by the different temperatures of the medium in the superheating screen outlet pipe 4 and the water-cooled wall. The limit frame 5 will not limit the up and down movement of the superheating screen outlet pipe 4, and the superheating screen can expand upward freely. The superheating screen outlet pipe 4 is not collected at the top of the furnace, but is connected to the connecting pipe 7 located on the left and right sides of the furnace in the form of an independent pipe. The independent pipe can use a smaller pipe diameter and has a stronger deformation ability to absorb the expansion. The connecting pipe 7 itself has an elbow, which can absorb its own expansion.
Claims
1. A structure for preventing the tearing of the metal expansion joint on the upper part of the superheating screen, comprising a superheating screen and a front wall water-cooled wall, wherein a metal expansion joint is arranged at the sealing part between the superheating screen and the front wall water-cooled wall, the upper header of the superheating screen is connected to the inlet header of the high-temperature superheater through an outlet pipe and a connecting pipe, and an upper header of the side wall water-cooled wall is arranged above the front wall water-cooled wall, characterized in that: A limiting frame is fixed on the upper header of the side wall water-cooled wall, and a limiting opening is provided on the limiting frame. The superheating screen outlet pipe passes through the limiting opening and is connected to one end of the connecting pipe, and the other end of the connecting pipe is connected to the high-temperature superheater inlet header.