Water cooling wall with fin-free transition area

Abstract

The utility model discloses a water-cooled wall with a fin-free transition area, which comprises a plurality of water-cooled wall tubes, the water-cooled wall tubes comprise tubes A and tubes B which are made of different materials, the tubes A and the tubes B are welded and communicated, the water-cooled wall comprises a fin area and a fin-free area, a welding seam of the tubes A and the tubes B is positioned in the fin-free area, and the welding seam of the tubes A and the tubes B is positioned in the fin-free area. And fins are welded between the adjacent water cooling wall tubes. According to the utility model, the operation safety requirements of different materials at high temperature can be met between water-cooled wall structures with large material difference, and the flexibility of the tube panel can adapt to the thermal stress between tube panels made of different materials.

Description

Technical Field

[0001] This utility model belongs to the field of water-cooled wall technology, specifically relating to a water-cooled wall with a finless transition zone. Background Technology

[0002] Water-cooled walls are an important component of power plant boilers. The enclosed space formed by the water-cooled wall tubes is the space for fuel combustion. The load of the burner and its wind box and other equipment is also transferred to the boiler top plate through the water-cooled wall tubes. At the same time, the water-cooled wall is also the heating surface that absorbs radiant heat in the furnace and heats the water into saturated steam or superheated steam. Therefore, the safety of the water-cooled wall has a significant impact on the safety of the boiler.

[0003] The water-cooled walls of large power plant boilers are generally a single unit welded from tubes and flat steel. As boiler parameters increase, the material at the outlet end of the water-cooled wall needs to be upgraded to T91 grade during the design process. Since there is a significant difference between T91 grade material and the lower 12Cr1MoVG grade material, if a conventional direct-welded membrane wall structure is used, thermal stress damage is likely to occur at the material boundary. Utility Model Content

[0004] To address the aforementioned issues, this invention provides a water-cooled wall with a finless transition zone. In water-cooled wall structures with significant material differences, it can meet the operational safety requirements of different materials at high temperatures, and the flexibility of the tube panel can adapt to the thermal stress between tube panels made of different materials.

[0005] The embodiments of this utility model are achieved through the following technical solutions:

[0006] A water-cooled wall with a finless transition zone includes a plurality of water-cooled wall tubes, the water-cooled wall tubes including tube A and tube B of different materials, tube A and tube B being welded together, the water-cooled wall including a finned zone and a finless zone, the weld seam of tube A and tube B being located in the finless zone, and fins being welded between adjacent water-cooled wall tubes in the finned zone.

[0007] In one embodiment of this utility model, the fin is provided with a stress relief slit.

[0008] In one embodiment of this utility model, the end of the stress relief joint is provided with a crack-stopping hole.

[0009] In one embodiment of this utility model, a flexible sealing box is also provided, which is fixed to the finned area, and the finless area is located within the coverage area of ​​the flexible sealing box.

[0010] In one embodiment of the present invention, the flexible sealing box includes a flexible sealing device and a connecting plate, wherein the flexible sealing device is fixed to both sides of the connecting plate and the finned area.

[0011] In one embodiment of the present invention, the flexible sealing device includes a sealing plug, a sealing folding plate, and an expansion joint. The expansion joint is fixed with sealing folding plates on both sides. The sealing folding plates are welded to the sealing plug. The sealing plug is fixed between two adjacent water-cooled wall tubes.

[0012] The technical solution of this utility model has at least the following advantages and beneficial effects:

[0013] This invention divides the water-cooled wall into a finned area and a finless area. Fins are welded between the water-cooled wall tubes in the finned area, while there are no fins between the water-cooled wall tubes in the finless area. At the same time, the weld seams of the water-cooled wall tubes are located in the finless area. When the water-cooled wall is in operation, although the materials of tubes A and B are quite different, the finless area provides space for the deformation of the water-cooled wall tubes, which can meet the safety requirements of different materials at high temperatures. The flexibility of the tube screen can adapt to the thermal stress between tube screens of different materials. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of a water-cooled wall with a finless transition zone in this utility model;

[0016] Figure 2 This is a top view of the flexible sealing device and connecting plate in the water-cooled wall of this utility model;

[0017] Figure 3 This is a first schematic diagram showing the water-cooled wall of this utility model omitting the flexible sealing box;

[0018] Figure 4 This is a second schematic diagram showing the water-cooled wall of this utility model omitting the flexible sealing box.

[0019] Icons: 1-Water-cooled wall tube, 23-Fin, 31-Stress relief joint, 32-Crack arresting hole, 411-Sealing plug, 412-Sealing folding plate, 413-Expansion joint, 42-Connecting plate. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be noted that if terms such as "inner" or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "configure," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Example

[0026] Please refer to Figure 1-4This embodiment provides a water-cooled wall with a finless transition zone, comprising a plurality of water-cooled wall tubes 1. The water-cooled wall tubes 1 are welded together by tubes A and B of different materials. In this embodiment, tube A is made of T91 grade material, and tube B is made of 12Cr1 MoVG grade material. The water-cooled wall is divided into a finned zone and a finless zone, which are connected. In the finned zone, fins 23 are welded between adjacent water-cooled wall tubes 1. In the finless zone, there are no fins 23 between adjacent water-cooled wall tubes 1. Meanwhile, the weld seam between tubes A and B is located in the finless zone. In this embodiment, the water-cooled wall is divided into a finned area and a finless area. Fins 23 are welded between the water-cooled wall tubes 1 in the finned area, while no fins 23 are welded between the water-cooled wall tubes 1 in the finless area. At the same time, the weld seam of the water-cooled wall tube 1 is located in the finless area. When the water-cooled wall is running, although the materials of tubes A and B are quite different, the finless area without flat steel makes the water-cooled wall tube 1 in the finless area a free tube structure, leaving space for the deformation of the water-cooled wall tube 1, increasing the flexibility between tubes of different materials, solving the problem of the difference in thermal expansion between the upper and lower tube screens, and meeting the safety requirements for the operation of different materials at high temperatures. The flexibility of the tube screen can adapt to the thermal stress between tube screens of different materials.

[0027] In this embodiment, the fin 23 with fin area is also provided with stress relief slit 31, and the end of the stress relief slit 31 is provided with crack prevention hole 32. When the water-cooled wall is running, the stress relief slit 31 provides space for the expansion and deformation of the water-cooled wall tube 1, so as to release the stress of the tube screen during operation and deformation. At the same time, the end of the stress relief slit 31 is provided with crack prevention hole 32 to prevent stress concentration.

[0028] In this embodiment, the water-cooled wall is also equipped with a flexible sealing box to ensure the structural integrity of the water-cooled wall and prevent air leakage. The flexible sealing box is fixed to the finned area, and the non-finned area is within the coverage area of ​​the flexible sealing box.

[0029] Specifically, the flexible sealing box includes a flexible sealing device and a connecting plate 42. The flexible sealing device is fixed on both sides of the connecting plate 42 and is fixed in the finned area. Due to the large size of the water-cooled wall, the flexible sealing device and the connecting plate 42 are spaced apart, or the flexible sealing device is only installed at the left and right ends of the connecting plate 42. The flexible sealing device includes a sealing plug 411, a sealing baffle 412, and an expansion joint 413. The expansion joint 413 uses a commercially available corrugated plate. The sealing baffle 412 is welded to both sides of the expansion joint 413. The sealing baffle 412 is welded to the sealing plug 411. The sealing plug 411 is welded between two adjacent water-cooled wall tubes 1. When the water-cooled wall is running, water flows in the water-cooled wall tubes 1, and high-temperature flue gas flows in the flexible sealing device. The flexible sealing device prevents high-temperature flue gas leakage. Moreover, the connecting plate 42 is welded and fixed to the expansion joints 413 at the left and right ends.

[0030] It should be noted that the upper and lower ends of the flexible sealing box are sealed by welding the end plates to the expansion joint 413. The end plates can be steel plates or corrugated joints. In this embodiment, the end plates are corrugated joints. Although the welding point between the end plates and the expansion joint 413 will affect the expansion deformation of the expansion joint 413, the overall structure of the water-cooled wall is large, and the size of the flexible sealing device and the expansion joint 413 is also large. Therefore, from the perspective of the overall deformation of the expansion joint 413, the restriction at the edge of the expansion joint 413 is almost negligible and does not affect the overall deformation.

[0031] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A water-cooled wall with a finless transition zone, comprising a plurality of water-cooled wall tubes, wherein the water-cooled wall tubes include tube A and tube B of different materials, and tube A and tube B are welded together, characterized in that, The water-cooled wall includes a finned area and a finless area. The weld seam of the A tube and the B tube is located in the finless area. In the finned area, fins are welded between adjacent water-cooled wall tubes.

2. A water-cooled wall with a finless transition zone according to claim 1, characterized in that, The fins are provided with stress relief slots.

3. A water-cooled wall with a finless transition zone according to claim 2, characterized in that, The stress relief joint is provided with a crack-stopping hole at its end.

4. A water-cooled wall with a finless transition zone according to claim 1, characterized in that, It also includes a flexible sealing box, which is fixed to the finned area, and the non-finned area is located within the coverage area of ​​the flexible sealing box.

5. A water-cooled wall with a finless transition zone according to claim 4, characterized in that, The flexible sealing box includes a flexible sealing device and a connecting plate. The flexible sealing device is fixed to both sides of the connecting plate and to the finned area.

6. A water-cooled wall with a finless transition zone according to claim 5, characterized in that, The flexible sealing device includes a sealing plug, a sealing baffle, and an expansion joint. The expansion joint has sealing baffles fixed on both sides. The sealing baffles are welded to the sealing plug. The sealing plug is fixed between two adjacent water-cooled wall tubes.

Images