CFB boiler hanging screen anti-wear structure

Abstract

This utility model discloses an anti-wear structure for a CFB boiler hanging screen, including a refractory cast-in-place layer, multiple water-cooled wall tubes, fins, and a grid-like grille composed of vertically intersecting vertical and horizontal plate groups. The horizontal plate groups are fixed by a connecting structure comprising a semi-circular groove, an externally threaded rod, a limiting plate, and a pressure plate, requiring no welding and making installation and disassembly simple and efficient. The vertical and horizontal plate groups are connected by a snap-fit ​​structure, including slots, mounting plates, positioning holes, and clearance grooves, ensuring a stable connection. Edge baffles are fixed by corner plates and a second mounting groove, enhancing structural integrity. The baffles have an inner arc edge that fits against the water-cooled wall tubes, and an outer arc edge that optimizes the gas-solid two-phase flow field, eliminating local eddies and reducing the scouring force of material particles. This structure effectively blocks high-speed wall-attached flow, significantly reduces wear on the heated surface, extends the service life of the water-cooled wall tubes and hanging screen, and is convenient to install and maintain. It is suitable for various CFB boiler anti-wear needs and has good practicality and promotional value.

Description

Technical Field

[0001] This utility model relates to the anti-wear structure of the hanging screen of CFB boiler, and belongs to the field of CFB boiler. Background Technology

[0002] CFB boilers involve a large amount of fluid circulation during operation. The high-speed flowing material particles continuously scour the water-cooled walls and the hanging screens installed on them, causing wear and tear, and in severe cases, even tube rupture and leakage. Currently, to solve this problem, thermally conductive grid anti-wear technology is often used. This is an active anti-wear technology. This technology involves installing alloy plates along the horizontal and vertical directions to form a mesh grid on the heating surface inside the furnace. After the grid plates are installed, they can block the formation of high-speed wall-attached flow, optimize the surface flow field of the water-cooled walls and hanging screens, eliminate local eddies, reduce the velocity of the gas-solid two-phase flow against the wall, and reduce the cutting force of material particles on the water-cooled walls, thereby effectively controlling the occurrence of wear and leakage on the heating surface.

[0003] Chinese utility model patent (application number: CN202221740096.1) discloses a protective device for a CFB boiler hanging screen. This device uses a grid-like structure formed by the perpendicular intersection of a first vertical plate group and a horizontal plate group. The horizontal plate group consists of multiple horizontally arranged first horizontal plates connected end-to-end and fixed by welding. However, this welding connection method requires workers to weld each plate individually, which is cumbersome, has low installation and disassembly efficiency, and high maintenance costs. Therefore, this utility model proposes a novel horizontal plate connection structure that eliminates the need for welding, making installation and disassembly more convenient while maintaining the anti-wear effect. Utility Model Content

[0004] The purpose of this invention is to provide a wear-resistant structure for CFB boiler hanging screens, which can effectively solve the above-mentioned problems.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] It includes a refractory casting layer, multiple water-cooled wall tubes, and fins; the water-cooled wall tubes are evenly arranged on the refractory casting layer, and the fins are arranged in the middle of the multiple water-cooled wall tubes; multiple vertical plate groups and multiple horizontal plate groups are evenly spaced at the front and rear ends of the fins, and the horizontal plate groups and the vertical plate groups are perpendicularly intersected to form a mesh grid.

[0007] The horizontal plate assembly consists of multiple horizontally arranged baffles, which are fixedly connected to each other by a connecting structure.

[0008] The connection structure includes a semi-circular groove on the side of the baffle. The semi-circular grooves on two adjacent baffles are combined to form a first mounting groove. An external threaded rod is provided in the first mounting groove. A limiting plate is fixed at the bottom of the external threaded rod. A pressure plate is threaded onto the external threaded rod. The pressure plate is located above the baffle, and the limiting plate is located below the baffle.

[0009] Furthermore: the vertical plate assembly includes multiple vertically arranged partitions, the lower ends of which are fixed to the refractory casting layer, and the partitions are connected to the baffles by a snap-fit ​​structure.

[0010] Furthermore: the snap-fit ​​structure includes a slot disposed on the partition plate and a mounting plate with mounting holes disposed at the front end of the partition plate; the height of the slot is slightly greater than the thickness of the baffle plate, and a positioning hole matching the mounting hole is provided at the front end of the baffle plate.

[0011] Furthermore, the front end of the baffle is also provided with a clearance groove to facilitate the insertion of the partition.

[0012] Furthermore, fixing plates are provided on both sides of the partition, and the fixing plates are connected to the fins by screws.

[0013] Furthermore, the two baffles located on the same side edge are connected by a corner plate, and two mating grooves are provided on the corner plate, and the mating grooves and the semi-circular grooves combine to form a second mounting groove.

[0014] Furthermore, one side of the fin is fixed to the inner wall of the boiler, and there are multiple fins.

[0015] Furthermore, the baffle plate is provided with an inner arc edge that fits against the water-cooled wall tube, and also with an outer arc edge.

[0016] The beneficial effects are:

[0017] 1. Easy installation and disassembly: Through the connection structure, the baffle in the horizontal plate assembly is quickly fixed by the cooperation of the semi-circular groove, external threaded rod, limiting plate and pressure plate. No welding is required, which greatly simplifies the installation and disassembly process, reduces construction difficulty and maintenance costs, and improves on-site operation efficiency.

[0018] 2. Stable and reliable connection: The snap-fit ​​structure, through the design of slots, mounting plates, positioning holes and clearance grooves, ensures the precise connection between the vertical plate group and the horizontal plate group. Combined with bolt fixing, the structure is stable and easy to disassemble and assemble, meeting the stability requirements for long-term operation.

[0019] 3. Edge structure optimization: The baffle located at the edge is connected by a corner plate and a second mounting groove, and uses the same fixing method as the first mounting groove to further enhance the integrity and wear resistance of the mesh grid edge.

[0020] 4. Enhanced structural stability: The baffles are connected to the fins by fixing plates and screws, which enhances the bonding strength between the vertical plate group and the boiler heating surface, ensuring the long-term stability of the mesh grid under high temperature and high scouring environment. Attached Figure Description

[0021] For ease of explanation, this utility model is described in detail below with reference to specific embodiments and accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the hanging screen structure of this utility model;

[0023] Figure 2 This is a drawing of the partition part of this utility model;

[0024] Figure 3 This is a drawing of the snap-fit ​​structure component of this utility model;

[0025] Figure 4 This is a diagram showing the connection between the partition and the cross plate of this utility model;

[0026] Figure 5 This is a partial drawing of the horizontal plate assembly of this utility model;

[0027] Figure 6 This is a drawing of the limiting plate part of this utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Refractory cast-in-place layer; 2. Water-cooled wall tube; 3. Fins; 4. Vertical plate assembly; 41. Partition plate; 42. Snap-fit ​​structure; 421. Slot; 422. Mounting plate; 423. Mounting hole; 424. Positioning hole; 425. Clearance groove; 426. Fixing plate; 5. Horizontal plate assembly; 51. Baffle plate; 52. Connecting structure; 521. Semicircular groove; 522. First mounting groove; 523. External threaded rod; 524. Limiting plate; 525. Pressure plate; 6. Angle plate; 7. Mating groove; 8. Second mounting groove; 9. Inner arc edge; 10. Outer arc edge. Detailed Implementation

[0030] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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.

[0032] Furthermore, the terms “first,” “second,” “third,” etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0033] Furthermore, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] See Figure 1-6 This is one embodiment of the wear-resistant structure for the CFB boiler hanging screen of this utility model.

[0035] like Figure 1 As shown, a hanging screen is formed by a refractory casting layer 1, multiple water-cooled wall tubes 2, and fins 3. The hanging screen is installed inside the CFB boiler and is fixed to the inner wall of the boiler by the fins 3 and the refractory casting layer 1. The lower end of the two water-cooled wall tubes 2 is provided with a water guide pipe connected to the cold water pipe on the inner wall of the boiler. For details, please refer to the Chinese Utility Model Patent (Application No.: CN202221740096.1) which discloses a CFB boiler hanging screen protection device.

[0036] The refractory casting layer 1 serves as the installation base for the suspended screen, providing high-temperature and corrosion-resistant support. Multiple water-cooled wall tubes 2 are fixed to the upper surface of the refractory casting layer 1 and are evenly arranged to form a heating surface for absorbing heat from the furnace.

[0037] The lower end of the fin 3 is fixed to the refractory casting layer 1 and to each water-cooled wall tube 2. The fin 3 has two functions: first, to fix each water-cooled wall tube 2 so that each water-cooled wall tube 2 can be vertically fixed to the refractory casting layer 1; second, to conduct the temperature from the water-cooled wall tube 2. When the water-cooled wall tube 2 is filled with cooling water, the low temperature will be transferred to the fin 3 through the water-cooled wall tube 2, and the cooling effect will be improved by utilizing the area of ​​the fin 3.

[0038] Multiple vertical plate groups 4 and multiple horizontal plate groups 5 are uniformly arranged at the front and rear ends of fin 3 along the horizontal and vertical directions. The vertical plate groups 4 and horizontal plate groups 5 are vertically staggered to form a mesh grid. The mesh grid optimizes the gas-solid two-phase flow field on the surface of the water-cooled wall tube 2 and the hanging screen by blocking the formation of high-speed wall-attached flow, eliminating local eddies, and reducing the scouring velocity of material particles, thereby reducing wear on the heated surface.

[0039] Meanwhile, this device improves the structure of the vertical plate group 4 and the horizontal plate group 5, making the vertical plate group 4 and the horizontal plate group 5 easier to install.

[0040] like Figure 5 , Figure 6 As shown, the horizontal plate assembly 5 consists of multiple horizontally arranged baffles 51. The baffles 51 are made of wear-resistant alloy material to withstand high temperatures and high erosion environments. The baffles 51 are fixedly connected by a connecting structure 52 without welding. The connecting structure 52 includes a semi-circular groove 521 on the side of the baffle 51. When the semi-circular grooves 521 of two adjacent baffles 51 are joined together, they form a circular first mounting groove 522. An externally threaded rod 523 is inserted into the first mounting groove 522. A limiting plate 524 is fixed to the bottom of the externally threaded rod 523. The limiting plate 524 is located below the baffle 51 to prevent the externally threaded rod 523 from moving upwards. A pressure plate 525 is threaded onto the externally threaded rod 523. After the pressure plate 525 is tightened, it is located above the baffle 51, clamping and fixing adjacent baffles 51 by tightening the pressure plate 525. During installation, insert the external threaded rod 523 into the first mounting slot 522 and tighten the pressure plate 525 to complete the fixation; disassembly is done in reverse, which is simple to operate and more efficient than the traditional welding method.

[0041] In addition, to facilitate the installation of the vertical plate assembly, this device is also equipped with a snap-fit ​​structure for the installation of the vertical plate assembly:

[0042] like Figure 2 , Figure 3 , Figure 4 As shown, the vertical plate assembly 4 includes multiple vertically arranged partitions 41, the lower ends of which are fixed to the refractory casting layer 1 by snap-fit ​​or bolts. The partitions 41 are made of wear-resistant alloy material and are connected to the baffles 51 by a snap-fit ​​structure 42. The snap-fit ​​structure 42 includes a slot 421 provided on the partition 41 and a mounting plate 422 with a mounting hole 423 at the front end. The height of the slot 421 is slightly greater than the thickness of the baffle 51. The front end of the baffle 51 is provided with a positioning hole 424 that matches the mounting hole 423, and a clearance groove 425 to facilitate the insertion of the partition 41.

[0043] During installation, the partition 41 moves toward the baffle 51, at which point the baffle 51 inserts into the slot 421 located on the partition 41, and the positioning hole 424 aligns with the mounting hole 423. It is then secured with bolts, ensuring a stable connection and easy disassembly. Simultaneously, the front end of the baffle 51 is provided with a clearance groove 425 to facilitate the insertion of the partition 41. The clearance groove 425 ensures that after the slot 421 of the partition 41 is inserted into the baffle 51, the front end face of the partition 41 is flush with the front end face of the baffle 51, and the mounting plate 422 fits snugly against the front end face of the baffle 51, further facilitating the fixation between the partition 41 and the baffle 51.

[0044] The partition 41 is provided with fixing plates 426 on both sides. The fixing plates 426 are connected to the fins 3 by screws, which further enhances the stability of the overall structure.

[0045] The baffle 51 located on the same side edge is connected by the corner plate 6. The corner plate 6 is provided with a mating groove 7, which combines with the semi-circular groove 521 to form the second mounting groove 8. The second mounting groove 8 adopts the same fixing method as the first mounting groove 522 (i.e., external threaded rod 523, limiting plate 524 and pressure plate 525) to enhance the stability of the edge structure.

[0046] To ensure close contact between the baffle 51 and the fins 3 and the water-cooled wall tube 2, the baffle 51 has an inner arc edge 9 that fits snugly against the water-cooled wall tube 2, thus reducing direct scouring by material particles. The baffle 51 also has an outer arc edge 10, which optimizes the flow field distribution of the gas-solid two-phase flow and reduces local eddies.

[0047] This embodiment achieves rapid assembly and disassembly of the horizontal plate assembly 5 and the vertical plate assembly 4 through the connecting structure 52 and the snap-fit ​​structure 42, eliminating the need for welding and significantly improving installation and maintenance efficiency. The mesh grille effectively blocks high-speed wall-attached flow, optimizes the flow field, reduces the scouring force of material particles, and significantly extends the service life of the water-cooled wall tubes 2 and the hanging screen. This structure is suitable for the anti-wear requirements of various CFB boilers and has good practicality and promotional value.

[0048] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. The wear-resistant structure of the CFB boiler hanging screen, characterized in that: It includes a refractory casting layer (1), multiple water-cooled wall tubes (2), and fins (3); the water-cooled wall tubes (2) are evenly arranged on the refractory casting layer (1), and the fins (3) are arranged in the middle of the multiple water-cooled wall tubes (2); multiple vertical plate groups (4) and multiple horizontal plate groups (5) are evenly spaced at the front and rear ends of the fins (3), and the horizontal plate groups (5) and the vertical plate groups (4) are perpendicularly intersected to form a grid; the horizontal plate groups (5) are composed of multiple horizontally arranged baffles (51), and the baffles (51) are fixedly connected to each other by a connecting structure (52); The connecting structure (52) includes a semi-circular groove (521) provided on the side of the baffle (51). The semi-circular grooves (521) on two adjacent baffles (51) are combined to form a first mounting groove (522). An external threaded rod (523) is provided in the first mounting groove (522). A limiting plate (524) is fixed at the bottom of the external threaded rod (523). A pressure plate (525) is threaded onto the external threaded rod (523). The pressure plate (525) is located above the baffle (51), and the limiting plate (524) is located below the baffle (51).

2. The CFB boiler suspension screen anti-wear structure according to claim 1, characterized in that: The vertical plate group (4) includes a plurality of vertically arranged partitions (41), the lower end of the partitions (41) is fixed on the refractory casting layer (1), and the partitions (41) and the baffles (51) are connected by a snap-fit ​​structure (42).

3. The CFB boiler suspension screen anti-wear structure according to claim 2, characterized in that: The snap-fit ​​structure (42) includes a slot (421) provided on the partition (41) and a mounting plate (422) with a mounting hole (423) provided at the front end of the partition (41); the height of the slot (421) is slightly greater than the thickness of the baffle (51), and a positioning hole (424) matching the mounting hole (423) is provided at the front end of the baffle (51).

4. The CFB boiler suspension screen anti-wear structure according to claim 3, characterized in that: The front end of the baffle (51) is also provided with a clearance groove (425) to facilitate the insertion of the partition (41).

5. The CFB boiler suspension screen anti-wear structure according to claim 4, characterized in that: Fixing plates (426) are also provided on both sides of the partition (41), and the fixing plates (426) are connected to the fins (3) by screws.

6. The CFB boiler suspension screen anti-wear structure according to claim 1, characterized in that: The two baffles (51) located on the same side edge are connected by a corner plate (6), and two mating grooves (7) are provided on the corner plate (6), and the mating grooves (7) and the semi-circular groove (521) are combined to form a second mounting groove (8).

7. The CFB boiler suspension screen anti-wear structure according to claim 1, characterized in that: One side of the fin (3) is fixed to the inner wall of the boiler, and there are multiple fins (3).

8. The CFB boiler suspension screen anti-wear structure according to claim 1, characterized in that: The baffle (51) is provided with an inner arc edge (9) that fits against the water-cooled wall tube (2), and also with an outer arc edge (10).

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