A limiting device for π-shaped bend of heating surface in circulating fluidized bed boiler

Abstract

This utility model relates to the field of circulating fluidized bed boiler technology and discloses a limiting device for a π-shaped bend in the heating surface of a circulating fluidized bed boiler. The device includes a limiting frame, with a π-shaped tube rotatably connected inside the limiting frame. Multiple wear-resistant tiles are fixedly connected to the outside of the π-shaped tube. A limiting block is installed on one of the bottom wear-resistant tiles, and a fixing block is installed on the outside of the other bottom wear-resistant tile. A fixing component is provided inside the fixing block, including a locking body. A sliding column is slidably connected inside the locking body, and a spring is sleeved on the outside of the sliding column. A connecting block is fixedly connected inside the sliding column. In this utility model, the arc-shaped limiting block can restrict the displacement of the π-shaped bend and the swing of the limiting device itself, avoiding friction with the pipe, preventing limiting failure and pipe thinning, and greatly reducing the occurrence of π-shaped bend leakage accidents.

Description

Technical Field

[0001] This utility model relates to the field of circulating fluidized bed boiler technology, and in particular to a limiting device for the π-shaped bend of the heating surface inside a circulating fluidized bed boiler. Background Technology

[0002] The π-shaped bend in the heating surface of a circulating fluidized bed boiler is an important component of the heating surface piping system. It is named for its "π" shape. It mainly consists of straight pipe sections and bends, and is usually arranged in areas such as the furnace, superheater, or reheater. It plays a key role in absorbing heat from the high-temperature flue gas in the furnace and transferring heat energy. The design of the π-shaped bend needs to take into account the complex thermal environment inside the boiler and must have good high-temperature resistance and wear resistance.

[0003] The working principle of the π-shaped bend in the heating surface of the circulating fluidized bed boiler is based on its special "π"-shaped structure and heat exchange mechanism. During operation, high-temperature dust-laden flue gas flows through the outside of the bend and transfers heat to the working medium (water or steam) inside the tube through convection and radiation, thus realizing heat energy exchange. The geometry of the bend increases the heating area in a limited space and enhances the heat transfer efficiency.

[0004] In circulating fluidized bed boilers, π-shaped bends are components of key heating surface tube banks such as superheaters and reheaters. They absorb the displacement of pipes caused by thermal expansion and prevent pipe deformation and cracking caused by thermal stress concentration. However, excessive displacement can cause overstressing and cracking of the π-shaped bends. Therefore, a limiting device for π-shaped bends in circulating fluidized bed boilers is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a limiting device for the π-shaped bend of the heating surface in a circulating fluidized bed boiler, aiming to improve the problem of excessive displacement of the π-shaped bend in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A limiting device for a π-shaped bend in the heating surface of a circulating fluidized bed boiler includes a limiting frame, a π-shaped tube rotatably connected inside the limiting frame, and multiple wear-resistant tiles fixedly connected to the outside of the π-shaped tube. A limiting block is installed on one of the wear-resistant tiles at the bottom, and a fixing block is installed on the outside of the other wear-resistant tile at the bottom. A fixing component is provided inside the fixing block.

[0008] As a further description of the above technical solution:

[0009] The fixing component includes a lock body, a sliding column is slidably connected inside the lock body, a spring is sleeved on the outside of the sliding column, a connecting block is fixedly connected inside the sliding column, a support rod is rotatably connected to the outside of the connecting block, and a nut is threadedly connected to the outside of the lock body.

[0010] As a further description of the above technical solution:

[0011] The nut is externally fixedly connected to multiple rotating columns, and the top of the lock body is fixedly connected to a retaining ring;

[0012] As a further description of the above technical solution:

[0013] The fixed ring is externally fixedly connected to a connecting ring, and the bottom inner wall of the limiting frame is fixedly connected to two limiting plates;

[0014] As a further description of the above technical solution:

[0015] The top of the support rod contacts the outer wall of the limiting block, and the bottom of the nut contacts the outer wall of the fixing block;

[0016] As a further description of the above technical solution:

[0017] The outer wall of the lock body is slidably connected to the inside of the fixed ring, and the outer wall of the support rod is slidably connected to the inner wall of the lock body;

[0018] As a further description of the above technical solution:

[0019] The outer wall of the lock body is slidably connected to the inside of the limiting block, and the outer wall of the lock body is slidably connected to the inside of the fixing block;

[0020] As a further description of the above technical solution:

[0021] The wear-resistant tile is made of wear-resistant steel plate, and the π-shaped tube is made of alloy steel.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, the arc-shaped limiting block can restrict the displacement of the π-shaped bend and the swing of the limiting device itself, avoid collision with the pipeline, prevent limiting failure and pipeline thinning, and greatly reduce the occurrence of π-shaped bend leakage accidents.

[0024] 2. In this utility model, after the limiting block is worn, rotating the rotating column causes the nut to loosen and squeeze, pressing the sliding column causes the support rod to retract into the inner wall, the lock body is taken out, and after replacement, the lock body is inserted. The spring pushes the sliding column to unfold the support rod to abut the limiting block, rotating the rotating column causes the nut to abut against the outer wall of the fixed block, and after tightening, the limiting block and the fixed block are made to fit together through the nut and the support rod. The limiting plates on both sides of the bottom of the limiting frame prevent the limiting block from tilting and fix its position. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of a limiting device for a π-shaped bend in the heating surface of a circulating fluidized bed boiler, as proposed in this utility model.

[0026] Figure 2 This is a schematic diagram of the structure of a limiting block for a limiting device for a π-shaped bend in the heating surface of a circulating fluidized bed boiler, as proposed in this utility model.

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0028] Legend:

[0029] 1. Limiting frame; 2. π-shaped tube; 3. Wear-resistant tile; 4. Limiting block; 5. Fixing block; 6. Lock body; 7. Sliding column; 8. Spring; 9. Connecting block; 10. Support rod; 11. Nut; 12. Rotating column; 13. Fixing ring; 14. Connecting ring; 15. Limiting plate. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Reference Figures 1 to 3This utility model provides an embodiment of a limiting device for a π-shaped bend in the heating surface of a circulating fluidized bed boiler. The device includes a limiting frame 1, with a π-shaped tube 2 rotatably connected inside the limiting frame 1. The limiting frame 1 provides an installation support structure for the π-shaped tube 2, which rotates within the limiting frame 1. Multiple wear-resistant tiles 3 are fixedly connected to the outside of the π-shaped tube 2, protecting the tube from abrasion and erosion by high-speed flying ash particles and bed material in the flue gas. A limiting block 4 is installed on one of the bottom wear-resistant tiles 3 to prevent structural damage or collision caused by excessive movement of the π-shaped tube 2. A fixing block 5 is installed on the outside of another bottom wear-resistant tile 3 to fix the limiting block 4. A fixing component is provided inside the fixing block 5, including a locking body 6, which is the main structure of the fixing component. The lock body 6 has a sliding pin 7 inside, which slides within the lock body 6. The movement of the sliding pin changes the locking state of the fixing component. A spring 8 is sleeved on the outside of the sliding pin 7. A connecting block 9 is fixedly connected inside the sliding pin 7. The connecting block 9 is fixed inside the sliding pin 7. A support rod 10 is rotatably connected to the outside of the connecting block 9. The support rod 10 is rotatably connected to the connecting block 9 and can swing with the movement of the sliding pin 7 to press against the limit block 4. A nut 11 is threadedly connected to the outside of the lock body 6. The fixing block 5 is pressed by rotating the nut 11. Multiple rotating pins 12 are fixedly connected to the outside of the nut 11. The rotating pins 12 are fixed on the outer surface of the nut 11 to provide a force point for the operator to rotate the nut 11. A fixing ring 13 is fixedly connected to the top of the lock body 6. A connecting ring 14 is fixedly connected to the outside of the fixing ring 13.

[0032] Reference Figure 1 and Figure 2Two limiting plates 15 are fixedly connected to the bottom inner wall of the limiting frame 1. The limiting plates 15 are fixed to the bottom of the limiting frame 1 and are used to limit the limiting block 4. The top of the support rod 10 contacts the outer wall of the limiting block 4, and the top of the support rod 10 abuts against the limiting block 4. The bottom of the nut 11 contacts the outer wall of the fixing block 5. After the nut 11 is tightened, it squeezes the fixing block 5. The outer wall of the lock body 6 is slidably connected to the inside of the fixing ring 13. The fixing ring 13 provides sliding guidance for the lock body 6. The outer wall of the support rod 10 is slidably connected to the inner wall of the lock body 6. The support rod 10 slides inside the lock body 6 and swings with the extension and retraction of the sliding column 7. The locking body 6 is slidably connected inside the limiting block 4 and slides within the limiting block 4. The outer wall of the locking body 6 is slidably connected inside the fixing block 5. The anti-wear tile 3 is made of wear-resistant steel plate. Its high hardness and impact resistance effectively resist the scouring and wear of the π-shaped tube 2 by the high-speed particle flow in the circulating fluidized bed boiler, extending the service life of the pipeline. The π-shaped tube 2 is made of alloy steel, which has high strength, high temperature resistance and good corrosion resistance, meeting the requirements of the high temperature and high pressure working environment in the boiler, ensuring the stability of the pipeline structure and long-term reliable operation.

[0033] Working principle: The π-shaped tube 2 rotates inside the limiting frame 1. However, the rotation of the limiting frame 1 causes the π-shaped tube 2 to rub against each other, resulting in wear and thinning of the π-shaped tube 2. Therefore, a limiting block 4 is installed on one side of the bottom anti-wear tile 3 to limit the swing of the limiting frame 1 itself caused by the high-speed fluidizing air. The limiting block 4 will wear under the limiting action for a long time. Rotating the rotating column 12 will drive the nut 11 to rotate, releasing the pressure on the limiting block 4 and the fixing block 5. Pressing the sliding column 7 will move the sliding column 7 towards the bottom of the lock body 6, thereby pressing the support rod 10 inside the lock body 6, so that the support rod 10 is received by the inner wall of the sliding column 7. The lock body 6 is then removed. Once the limit block 4 has been replaced, the lock body 6 is inserted between the limit block 4 and the fixed block 5. Under the elastic potential energy of the spring 8, the sliding column 7 unfolds and the support rod 10 abuts against the outer wall of the limit block 4. At the same time, rotating the rotating column 12 drives the nut 11 to rotate, and the nut 11 abuts against the outer wall of the fixed block 5. By tightening the nut 11, the limit block 4 and the fixed block 5 fit tightly together under the action of the nut 11 and the support rod 10. Meanwhile, the bottom inner wall of the limit frame 1 has a limiting plate 15 fixed on both sides of the limit block 4 to prevent the limit block 4 from tilting. At the same time, it plays a role in fixing the position when installing the limit block 4.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A limiting device for the π-shaped bend of the heating surface in a circulating fluidized bed boiler, comprising a limiting frame (1), characterized in that: The limiting frame (1) is rotatably connected to a π-shaped tube (2), and multiple anti-wear tiles (3) are fixedly connected to the outside of the π-shaped tube (2). One of the anti-wear tiles (3) at the bottom is equipped with a limiting block (4), and the other anti-wear tile (3) at the bottom is equipped with a fixing block (5). The fixing block (5) is equipped with a fixing component inside.

2. The limiting device for the π-shaped bend of the heating surface in the circulating fluidized bed boiler according to claim 1, characterized in that: The fixing component includes a lock body (6), a sliding column (7) is slidably connected inside the lock body (6), a spring (8) is sleeved on the outside of the sliding column (7), a connecting block (9) is fixedly connected inside the sliding column (7), a support rod (10) is rotatably connected to the outside of the connecting block (9), and a nut (11) is threadedly connected to the outside of the lock body (6).

3. The limiting device for the π-shaped bend of the heating surface in the circulating fluidized bed boiler according to claim 2, characterized in that: The nut (11) is externally fixedly connected to a plurality of rotating columns (12), and the top of the lock body (6) is fixedly connected to a fixing ring (13).

4. The limiting device for the π-shaped bend of the heating surface in the circulating fluidized bed boiler according to claim 3, characterized in that: The fixed ring (13) is externally fixedly connected to a connecting ring (14), and the bottom inner wall of the limiting frame (1) is fixedly connected to two limiting plates (15).

5. The limiting device for the π-shaped bend of the heating surface in the circulating fluidized bed boiler according to claim 2, characterized in that: The top of the support rod (10) is in contact with the outer wall of the limiting block (4), and the bottom of the nut (11) is in contact with the outer wall of the fixing block (5).

6. The limiting device for the π-shaped bend of the heating surface in the circulating fluidized bed boiler according to claim 3, characterized in that: The outer wall of the lock body (6) is slidably connected to the inside of the fixing ring (13), and the outer wall of the support rod (10) is slidably connected to the inner wall of the lock body (6).

7. The limiting device for the π-shaped bend of the heating surface in the circulating fluidized bed boiler according to claim 2, characterized in that: The outer wall of the lock body (6) is slidably connected to the inside of the limiting block (4), and the outer wall of the lock body (6) is slidably connected to the inside of the fixing block (5).

8. The limiting device for the π-shaped bend of the heating surface in the circulating fluidized bed boiler according to claim 1, characterized in that: The wear-resistant tile (3) is made of wear-resistant steel plate, and the π-shaped tube (2) is made of alloy steel.

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