Tail flag structure of an angle tube boiler

Abstract

Tail flag type screen structure of corner tube boiler relates to the technical field of boiler. In order to solve the problem that the inertial force of flue gas can cause the abrasion of the welding position of the convection flag type screen and the flagpole tube of the existing corner tube boiler in use, and cause the heat exchange efficiency of the convection flag type screen to be reduced. The folding smoke flag type screen is arranged at the furnace outlet and the tail vertical shaft entrance, and the lower part of the flagpole tube group inside the furnace outlet and the tail vertical shaft is provided with the convection flag type screen. The convection flag type screen is communicated with the flagpole tube group, and the bending angle of the flagpole tube group is provided with the folding smoke flag type screen. The folding smoke flag type screen is communicated with the flagpole tube group. The side of the folding smoke flag type screen is provided with a folding smoke corner, which can effectively divide the flue gas flow and reduce the abrasion of the root part of the convection flag type screen due to the inertial force of the flue gas. The flue gas can uniformly pass through the whole convection flag type screen, the heat exchange is strengthened, the heat exchange efficiency of the convection flag type screen is improved, and the overall efficiency of the boiler is further improved. The present application is suitable for the technical field of boiler.

Description

Technical Field

[0001] This invention relates to the field of boiler technology, specifically to a tail-end flag-type screen structure for a corner tube boiler. Background Technology

[0002] Currently, the flag-type screen structure of the convective heating surface at the tail shaft of the corner tube boiler has problems due to the furnace layout and flue gas flow. The flue gas needs to make a 180° turn when it passes through the furnace outlet to the tail shaft. This causes the flue gas to be subjected to inertial force when passing through the convective flag screen, which aggravates the wear at the root of the convective flag screen. In addition, the flue gas cannot effectively and evenly flush the entire convective flag screen, which affects the convective heat transfer efficiency.

[0003] In summary, when using existing corner tube boilers, the inertial force of the flue gas causes wear at the welded joint between the convection flag screen and the flagpole tube, resulting in a reduction in the heat exchange efficiency of the convection flag screen. Summary of the Invention

[0004] This invention addresses the problem that the inertial force of flue gas causes wear at the welding point between the convection flag screen and the flagpole tube during the operation of existing corner tube boilers, leading to a reduction in the heat exchange efficiency of the convection flag screen. The invention proposes a tail flag screen structure for corner tube boilers.

[0005] The present invention provides a tail flag-type screen structure for a corner tube boiler, which comprises a flagpole tube assembly 1, a smoke deflector flag-type screen 2, a throttling plate 3, and a convection flag-type screen 4.

[0006] The lower part of the flagpole tube assembly 1 is provided with a convection flag screen 4, which is connected to the flagpole tube assembly 1. The bend of the flagpole tube assembly 1 is provided with a cigarette folding flag screen 2, which is connected to the flagpole tube assembly 1.

[0007] The flagpole tube assembly 1 includes multiple flagpole tubes 1-1 arranged in parallel; the folding smoke flag screen 2 includes multiple serpentine tubes 2-1 and a sealing steel plate 2-2, the multiple serpentine tubes 2-1 arranged in parallel, and the middle of every two serpentine tubes 2-1 is fixedly connected by the sealing steel plate 2-2.

[0008] In the folding cigarette flag screen 2, the top end of each serpentine tube 2-1 is connected to the top end of the flagpole tube 1-1 in the flagpole tube group 1, and the bottom end of each serpentine tube 2-1 is connected to the bottom end of the flagpole tube 1-1. A throttling plate 3 is provided above the connection between the bottom end of the serpentine tube 2-1 and the bottom end of the flagpole tube 1-1, and the throttling plate 3 is located inside the flagpole tube 1-1.

[0009] Furthermore, a countersunk hole 1-2 is machined on the outer surface of the top end of the flagpole tube 1-1;

[0010] Furthermore, a countersunk hole 1-2 is machined on the outer surface of the bottom end of the flagpole tube 1-1, and the countersunk hole 1-2 is located below the contact point between the edge of the throttling plate 3 and the inner wall of the flagpole tube 1-1.

[0011] Furthermore, the side of the folding cigarette flag screen 2 is provided with folding corners;

[0012] Furthermore, the number of the serpentine tubes 2-1 is equal to the number of the flagpole tubes 1-1;

[0013] Furthermore, the middle of each pair of serpentine tubes 2-1 is welded and fixed by a sealing steel plate 2-2;

[0014] Furthermore, a flue gas deflector 2 is arranged at the furnace outlet and the tail shaft inlet, and a convection flag 4 is provided at the lower part of the flagpole assembly 1 inside the furnace outlet and the tail shaft. The convection flag 4 is connected to the flagpole assembly 1, and a flue gas deflector 2 is provided at the bend of the flagpole assembly 1. The flue gas deflector 2 is connected to the flagpole assembly 1. The side of the flue gas deflector 2 is provided with a deflection angle, which can effectively divide the flue gas flow and reduce the wear of the root of the convection flag 4 due to the inertial force of the flue gas. This allows the flue gas to pass evenly through the entire convection flag 4, enhances heat exchange, improves the convective heat exchange efficiency, and further improves the overall efficiency of the boiler.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] This invention overcomes the shortcomings of existing technologies by arranging deflector flag screens at the furnace outlet and the tail shaft inlet. Furthermore, convection flag screens are installed at the lower part of the flagpole tube assemblies inside the furnace outlet and tail shaft, connected to the flagpole tube assemblies. Deflector flag screens are also installed at the bends of the flagpole tube assemblies, connected to the flagpole tube assemblies. The deflector flag screens utilize the deflector angles on their sides to effectively divide the flue gas flow, reducing wear on the base of the convection flag screens due to inertial forces. This allows the flue gas to pass evenly through the entire convection flag screen, enhancing heat exchange, improving the heat exchange efficiency of the convection flag screens, and further improving the overall boiler efficiency. Attached Figure Description

[0017] Figure 1 This is a main sectional view of the tail flag-type screen structure of a corner tube boiler according to the present invention.

[0018] Figure 2 This is a schematic diagram showing the connection between the serpentine tube and the flagpole tube of the tail flag screen in the tail flag screen structure of a corner tube boiler according to the present invention.

[0019] Figure 3 This is a schematic diagram of the flagpole tube opening and the addition of a throttling plate in the tail flag-type screen structure of a corner tube boiler according to the present invention.

[0020] Figure 4 This is a schematic diagram of the existing structure and flue gas flow without the addition of a folding smoke flag screen. Detailed Implementation

[0021] Specific implementation method one: Combining Figures 1 to 3 This embodiment describes a tail-end flag-type screen structure for a corner tube boiler, which comprises a flagpole tube assembly 1, a smoke-bending flag-type screen 2, a throttling plate 3, and a convection flag-type screen 4.

[0022] The lower part of the flagpole tube assembly 1 is provided with a convection flag screen 4, which is connected to the flagpole tube assembly 1. The bend of the flagpole tube assembly 1 is provided with a cigarette folding flag screen 2, which is connected to the flagpole tube assembly 1.

[0023] The flagpole tube assembly 1 includes multiple flagpole tubes 1-1 arranged in parallel; the folding smoke flag screen 2 includes multiple serpentine tubes 2-1 and a sealing steel plate 2-2, the multiple serpentine tubes 2-1 arranged in parallel, and the middle of every two serpentine tubes 2-1 is fixedly connected by the sealing steel plate 2-2.

[0024] In the folding cigarette flag screen 2, the top end of each serpentine tube 2-1 is connected to the top end of the flagpole tube 1-1 in the flagpole tube group 1, and the bottom end of each serpentine tube 2-1 is connected to the bottom end of the flagpole tube 1-1. A throttling plate 3 is provided above the connection between the bottom end of the serpentine tube 2-1 and the bottom end of the flagpole tube 1-1, and the throttling plate 3 is located inside the flagpole tube 1-1.

[0025] In this specific embodiment, a flue gas deflector 2 is arranged at the furnace outlet and the tail shaft inlet. A convection flag 4 is provided at the lower part of the flagpole assembly 1 inside the furnace outlet and the tail shaft. The convection flag 4 is connected to the flagpole assembly 1, and a flue gas deflector 2 is provided at the bend of the flagpole assembly 1. The flue gas deflector 2 is also connected to the flagpole assembly 1. The side of the flue gas deflector 2 has a deflection angle, which can effectively divide the flue gas flow and reduce the wear on the root of the convection flag 4 due to inertial force. This allows the flue gas to pass evenly through the entire convection flag 4, enhancing heat exchange, improving convective heat exchange efficiency, and further improving the overall boiler efficiency.

[0026] Specific Implementation Method Two: Combining Figure 3 This embodiment further defines the tail flag-type screen structure described in Specific Embodiment 1. In this embodiment, a tail flag-type screen structure for a corner tube boiler has a countersunk hole 1-2 machined on the outer surface of the top end of the flagpole tube 1-1.

[0027] Specific implementation method three: Combining Figure 3This embodiment further defines the tail flag-type screen structure described in Specific Embodiment Two. In this embodiment, a tail flag-type screen structure for a corner tube boiler is provided, wherein a countersunk hole 1-2 is machined on the outer surface of the bottom end of the flagpole tube 1-1, and the countersunk hole 1-2 is located below the contact point between the edge of the throttling plate 3 and the inner wall of the flagpole tube 1-1.

[0028] Specific implementation method four: Combination Figure 1 This embodiment is a further limitation of the tail flag screen structure described in Specific Embodiment 1. The tail flag screen structure of the corner tube boiler described in this embodiment has a folding angle on the side of the folding smoke flag screen 2.

[0029] In this specific embodiment, the side of the folding smoke flag screen 2 is provided with a folding angle, which can decompose or change the flow direction of the smoke, thereby reducing the wear of the root of the convection flag screen 4 due to the inertial force of the smoke.

[0030] Specific Implementation Method Five: Combining Figure 1 This embodiment further defines the tail flag-type screen structure described in Specific Embodiment 1. In this embodiment, the number of serpentine tubes 2-1 is equal to the number of flagpole tubes 1-1 in the tail flag-type screen structure of a corner tube boiler.

[0031] Specific Implementation Method Six: Combination Figure 1 This embodiment further defines the tail flag screen structure described in Specific Embodiment 1. In this embodiment, the tail flag screen structure of a corner tube boiler is fixed by welding the middle of every two serpentine tubes 2-1 with a sealing steel plate 2-2.

[0032] In this specific embodiment, the middle of every two serpentine tubes 2-1 is welded and fixed by a sealing steel plate 2-2 to improve the stability of the device during use.

[0033] Working principle

[0034] A flue gas deflector 2 is arranged at the furnace outlet and the tail shaft inlet. A convection flag 4 is provided at the lower part of the flagpole assembly 1 inside the furnace outlet and the tail shaft. The convection flag 4 is connected to the flagpole assembly 1. A flue gas deflector 2 is provided at the bend of the flagpole assembly 1. The flue gas deflector 2 is connected to the flagpole assembly 1. The side of the flue gas deflector 2 has a deflection angle, which can effectively divide the flue gas flow and reduce the wear of the root of the convection flag 4 due to the inertial force of the flue gas. This allows the flue gas to pass evenly through the entire convection flag 4, enhances heat exchange, improves the convective heat exchange efficiency, and further improves the overall efficiency of the boiler.

Claims

1. A tail-end flag-type screen structure for a corner tube boiler, characterized in that: It includes a flagpole assembly (1), a smoke-reducing flag screen (2), a throttling plate (3), and a convection flag screen (4); a smoke-reducing flag screen (2) is arranged at the furnace outlet and the tail shaft inlet; a convection flag screen (4) is provided at the lower part of the flagpole assembly (1), the convection flag screen (4) is connected to the flagpole assembly (1), and a smoke-reducing flag screen (2) is provided at the bend of the flagpole assembly (1), the smoke-reducing flag screen (2) is connected to the flagpole assembly (1); the flagpole assembly (1) includes multiple flagpole tubes (1-1), which are arranged in parallel; the smoke-reducing flag screen (2) includes multiple serpentine tubes (2-1) and a sealing steel plate (2-2), which are arranged in parallel. 1) Parallel arrangement, with the middle of every two serpentine tubes (2-1) fixedly connected by a sealing steel plate (2-2) to form a flat steel sealing area so that the smoke cannot pass through. The side of the folding smoke flag screen (2) is provided with a folding smoke angle, which is located in the flat steel sealing area. The top of each serpentine tube (2-1) in the folding smoke flag screen (2) is connected to the top of the flagpole tube (1-1) in the flagpole tube group (1). The bottom of each serpentine tube (2-1) is connected to the bottom of the flagpole tube (1-1). A throttling plate (3) is provided above the connection between the bottom of the serpentine tube (2-1) and the bottom of the flagpole tube (1-1). The throttling plate (3) is located inside the flagpole tube (1-1).

2. The tail-end flag-type screen structure of a corner tube boiler according to claim 1, characterized in that: The flagpole tube mentioned above (1-1) A countersunk hole (1-2) is machined on the outer surface of the top.

3. The tail-end flag-type screen structure of a corner tube boiler according to claim 2, characterized in that: The flagpole tube (1-1) has a countersunk hole (1-2) machined on the outer surface of its bottom end, and the countersunk hole (1-2) is located at the edge of the throttle plate (3) and the flagpole tube (1-1). Below the contact point on the inner wall.

4. The tail-end flag-type screen structure of a corner tube boiler according to claim 1, characterized in that: The serpentine tube The number of (2-1) is equal to the number of flagpole tubes (1-1).

5. The tail-end flag-type screen structure of a corner tube boiler according to claim 1, characterized in that: Each of the two mentioned The middle part of the serpentine tube (2-1) is fixed by welding with a sealing steel plate (2-2).

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