Wear-resistant boiler hood structure

Abstract

The utility model discloses a wear-resistant boiler air cap structure which comprises a first core tube fixedly connected with a through hole of an air distribution plate, and further comprises a second core tube which is in threaded connection with the upper end of the first core tube in the through hole of the air distribution plate and is provided with a first air outlet hole at the upper part, and a hollow cap head of which the upper end is provided with a welding tube covers the upper part of the second core tube. The upper end of the second core tube is in threaded connection with a threaded plug penetrating through the welding tube, the lower portion of the second core tube is fixedly connected with a tube seat abutting against the air distribution plate, and the lower portion of the cap head is fixedly provided with a thickening portion which is connected with the tube seat in a clamped mode and provided with a second air outlet hole. The second core pipe is convenient to disassemble, meanwhile, the adverse effect of heat on the threaded end can be prevented, the cap head can be prevented from rotating in the radial direction, the welding pipe arranged at the upper end of the cap head and the welding column are only locally welded, the welding workload is reduced, meanwhile, the cap head is easy to replace, material use can be reduced, and meanwhile the abrasion resistance of the cap head is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circulating fluidized bed boilers, in particular to a wear-resistant boiler hood structure. Background Art

[0002] Circulating fluidized bed boilers are a clean coal combustion technology with wide fuel adaptability and low pollutant emissions. They have experienced rapid development both domestically and internationally. The safe and economical operation of circulating fluidized bed boilers is constrained by many factors, one of which is the need to establish a stable material circulation. The air distribution device is of great significance for achieving uniform fluidization of the material. Its purpose is to deliver boiler air to the furnace bed material layer to meet the air requirements of the boiler. By controlling the amount of air supply, the furnace bed material layer is always kept in a fluidized and boiling state, ensuring thorough combustion of the coal. The air distribution device of a circulating fluidized bed boiler consists of an air distribution plate and a hood. The hood structure is arranged on the air distribution plate in a certain arrangement, which allows the primary air to enter the bottom layer of the furnace evenly, ensuring uniform fluidization of the bed material and the normal combustion operation of the fluidized bed boiler.

[0003] At present, the commonly used mainstream hood structure is generally a bell-type hood, which is generally composed of a hood head and a core tube. The core tube is directly welded to the air distribution plate. During the long-term operation of the boiler, due to the high working environment temperature and high wind speed, many hoods suffer from serious wear, carbonization, and hood head blowing off. In order to prevent the hood head from loosening and falling off, the existing technology welds the top of the inner wall of the hood head and the top of the core tube together as a whole, and increases the thickness of the side wall and top wall of the hood head, thereby improving the stability and wear resistance of the hood structure. However, when the hood head needs to be replaced after long-term use, it is difficult to separate the hood head from the core tube, making it difficult to replace the hood head, and the hood can only be destructively disassembled as a whole; on the other hand, simply thickening the hood head will waste materials and result in smaller spacing between hoods, which can easily cause increased blowing between adjacent hood heads, further increasing the wear at the hood hole. Utility Model Content

[0004] In order to solve the technical problems in the prior art that the cap head and the core tube are difficult to separate, making it difficult to replace the cap head, and simply thickening the cap head will waste materials and result in smaller spacing between the wind caps, which easily causes increased blowing between adjacent cap heads and further leads to increased wear at the cap holes, the utility model provides the following technical solutions.

[0005] The utility model discloses a wear-resistant boiler hood structure, comprising a first core tube fixedly connected to the through hole of an air distribution plate, and also comprising a second core tube with a first air outlet hole provided on the upper part of the first core tube which is threadedly connected to the upper end of the first core tube in the through hole of the air distribution plate, the upper part of the second core tube is covered with a hollow cap head with a welded tube at the upper end, the upper end of the second core tube is threadedly connected to a threaded plug passing through the welded tube, the lower part of the second core tube is fixedly connected to a pipe seat abutting the air distribution plate, and the lower part of the cap head is fixedly provided with a thickened part with the second air outlet hole which is clamped and connected to the pipe seat.

[0006] As a further technical solution, the pipe seat includes a ring body abutting against the air distribution plate and a plurality of grooves located on the upper part of the ring body, and the lower end of the thickened part is provided with a limiting protrusion matching the groove.

[0007] As a further technical solution, the threaded plug includes a threaded column threadedly connected to the upper end of the second core tube and a welding column passing through the welding tube.

[0008] As a further technical solution, the welding column passes through the upper end of the welding pipe and is welded to the upper part of the welding pipe.

[0009] As a further technical solution, the thickened portion and the upper end of the cap head are both thickened.

[0010] As a further technical solution, the second air outlet is arranged obliquely downward in the radial direction of the thickened portion.

[0011] The beneficial effects of the present invention are as follows: the first core tube of the present invention is welded to the through hole of the air distribution plate, and the first core tube and the second core tube provided with a tube seat are connected by threads in the through hole, which facilitates the disassembly of the second core tube while preventing heat from causing adverse effects on the threaded end. The upper part of the second core tube is covered with a hollow cap head, the outer wall of the second core tube and the inner wall of the cap head are provided with a cavity for wind flow, the lower part of the cap head is provided with a thickened part, the tube seat is provided with a groove, and the lower end of the thickened part is provided with a limiting protrusion matching the groove, which can snap-connect the tube seat and the thickened part to prevent the radial rotation of the cap head. At this time, the welding pipe and the welding column provided at the upper end of the cap head are only partially welded, which reduces the welding workload and facilitates disassembly when the cap head needs to be replaced later, and the cap head is simply replaced. The cap head is thickened only on the upper end of the material directly facing the thickened part and the mutually blowing thickened part, and the second air outlet is staggered and arranged obliquely, which reduces the use of materials while improving the wear resistance of the cap head. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the overall structure of the wear-resistant boiler hood structure of the utility model;

[0013] Figure 2 This is an exploded schematic diagram of the wear-resistant boiler hood structure of the utility model from one perspective;

[0014] Figure 3 This is an exploded schematic diagram of the wear-resistant boiler hood structure of the utility model from another perspective;

[0015] Figure 4 It is a schematic cross-sectional view of a partial structure of the wear-resistant boiler hood structure of the utility model;

[0016] In the figure: 1-first core tube; 2-second core tube; 201-threaded end; 202-first air outlet; 3-cap head; 301-welded tube; 4-tube seat; 401-ring body; 402-groove; 5-thickened part; 501-second air outlet; 502-limiting protrusion; 6-threaded plug; 601-welded column; 602-threaded column; 7-air distribution plate. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other unless there is a conflict.

[0018] In the description of this utility model, it should be understood that the terms "upper" and "lower" are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc. are used solely for descriptive purposes and should not be construed to indicate or imply relative importance or implicitly specify the quantity of the technical features referred to. In the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0019] like Figure 1 As shown, the utility model is a wear-resistant boiler hood structure, including a first core tube 1 fixedly connected to the through hole of the air distribution plate 7. The air distribution plate 7 shown in the figure is only a small part of the actual air distribution plate. The air distribution plate 7 is only used to describe the hood structure of the utility model. In the air distribution device, a large number of hood structures are arranged on the air distribution plate in a certain arrangement.

[0020] like Figure 2 and Figure 3As shown, in a preferred embodiment, the upper end of the first core tube 1 is located in the through hole of the air distribution plate 7, and the upper end of the first core tube 1 is provided with an internal thread. The upper end of the first core tube 1 is threadedly connected to the second core tube 2 in the through hole of the air distribution plate 7. At this time, the lower end of the second core tube 2 is provided with a threaded end 201, and the threaded end 201 is threadedly connected and fixed to the upper end of the first core tube 1. The lower part of the second core tube 2 is fixedly connected to the tube base 4 that abuts the air distribution plate 7. The tube base 4 can further reduce the adverse effects of heat on the threaded end 201 in the through hole, prevent thermal deformation of the thread, and ensure that the threaded connection between the first core tube 1 and the second core tube 2 is easy to disassemble.

[0021] In a preferred embodiment, a plurality of first air outlet holes 202 are provided on the upper portion of the second core tube 2. A hollow cap head 3 is covered on the upper portion of the second core tube 2. A cavity for wind flow is formed between the outer wall of the second core tube 2 and the inner wall of the cap head 3. Wind from the air chamber enters the first core tube 1 and the second core tube 2 and enters the cavity from the first air outlet holes 202. A thickened portion 5 with second air outlet holes 501, which is engaged with the tube seat 4, is fixedly provided on the lower portion of the cap head 3. Wind flows from the air into the second air outlet holes 501 and is ejected from the second air outlet holes 501. The second air outlet holes 501 are arranged to be tilted downward in the radial direction of the thickened portion 5, which can reduce the blow-through wear on the adjacent cap heads 3 and reduce the blow-through on the side walls of the cap head 3. The cap head 3 is thickened only at the upper end and the thickened portion 5 is thickened. Wear resistance can be ensured without thickening the entire cap head 3.

[0022] like Figure 3 and Figure 4 As shown, in a preferred embodiment, the tube seat 4 is integrally formed or welded with the second core tube 2. The tube seat 4 includes a ring body 401 that abuts the air distribution plate 7 and a plurality of grooves 402 located on the upper part of the ring body 401. The ring body 401 can be a circular ring structure, and the grooves 402 can be the shape shown in the figure, or other square or circular shapes. This embodiment does not specifically limit them. The lower end of the thickened portion 5 is provided with a plurality of limiting protrusions 502 that match the grooves 402. During assembly, the cap head 3 can be held by hand, the limiting protrusions 502 can be aligned with the grooves 402, and the limiting protrusions 502 can be inserted into the grooves 402. This can prevent the cap head 3 from radially moving relative to the second core tube 2.

[0023] In a preferred embodiment, a welding tube 301 is provided at the upper end of the cap head 3. The welding tube 301 is a hollow tubular structure that passes through the cap head 3. A threaded plug 6 that passes through the welding tube 301 is threadedly connected to the upper end of the second core tube 2. Specifically, the threaded plug 6 includes a threaded column 602 that is threadedly connected to the upper end of the second core tube 2 and a welding column 601 that passes through the welding tube 301. The welding column 601 passes through the upper end of the welding tube 301 and is welded to the upper portion of the welding tube 301. The engagement connection between the tube seat 4 and the thickened portion 5 prevents the cap head 3 from rotating radially. At this time, the welding tube 301 provided at the upper end of the cap head 3 and the welding column 601 are only partially welded, resulting in a stable connection. The cap head 3 will not loosen even in strong winds. After the cap head 3 is worn out after long-term use, the welding tube 301 can be removed and cut, facilitating the removal and replacement of the cap head 3 and the second core tube 2.

[0024] When the utility model is used, the second core tube 2 is first threadedly connected to the first core tube 1, and after the connection is fixed, the tube seat 4 is abutted against the air distribution plate 7; then the threaded plug 6 is screwed, and the threaded column 601 of the threaded plug 6 is threadedly connected and fixed to the upper end of the second core tube 2; then the cap head 3 is held, the limiting protrusion 502 is aligned with the groove 402 and the limiting protrusion 502 is inserted into the groove 402, at this time, the welding column 601 is passed from the welding pipe 301 to the upper part of the cap head 3, and then the welding column 601 is welded and fixed to the welding pipe 301. After long-term use and wear, when the cap head 3 needs to be replaced, the welding pipe 301 is directly cut to separate the welding pipe 301 from the welding column 601, the cap head 3 is removed, and the threaded plug 6 is unscrewed, and a new threaded plug 6 and cap head 3 are replaced.

[0025] The preferred specific implementation methods and embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above implementation methods and embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes or equivalent substitutions can be made without departing from the concept of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments that fall within the scope of the claims of this application belong to the scope of protection of the present invention.

Claims

1. A wear-resistant boiler hood structure, comprising a first core tube (1) fixedly connected to a through hole of an air distribution plate (7), characterized in that: It also includes a second core tube (2) having a first air outlet (202) provided on its upper portion and being threadedly connected to the upper end of the first core tube (1) in the through hole of the air distribution plate (7), the upper portion of the second core tube (2) is covered with a hollow cap head (3) having a welding tube (301) provided on its upper end, the upper end of the second core tube (2) is threadedly connected to a threaded plug (6) passing through the welding tube (301), the lower portion of the second core tube (2) is fixedly connected to a tube seat (4) abutting against the air distribution plate (7), and the lower portion of the cap head (3) is fixedly provided with a thickened portion (5) provided with a second air outlet (501) that is snap-fitted with the tube seat (4).

2. The wear-resistant boiler hood structure according to claim 1, characterized in that: The pipe seat (4) comprises a ring body (401) abutting against the air distribution plate (7) and a plurality of grooves (402) located on the upper portion of the ring body (401); the lower end of the thickened portion (5) is provided with a limiting protrusion (502) matching the groove (402).

3. The wear-resistant boiler hood structure according to claim 1, characterized in that: The threaded plug (6) comprises a threaded column (602) threadedly connected to the upper end of the second core tube (2) and a welding column (601) passing through the welding tube (301).

4. The wear-resistant boiler hood structure according to claim 3, characterized in that: The welding column (601) passes through the upper end of the welding pipe (301) and is welded to the upper part of the welding pipe (301).

5. The wear-resistant boiler hood structure according to claim 1, characterized in that: The thickened portion (5) and the upper end of the cap head (3) are both thickened.

6. The wear-resistant boiler hood structure according to claim 1, characterized in that: The second air outlet hole (501) is arranged obliquely downward in the radial direction of the thickened portion (5).

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