Anti-falling structure for partition wall of boiler return feeder

Abstract

The utility model provides an anti-falling structure for a partition wall of a boiler return feeder, which relates to the technical field of circulating fluidized bed boilers and comprises a boiler wall, a hexsteel, an anchor rod, a first connecting component and a second connecting component. According to the anti-falling structure for the partition wall of the boiler return feeder, the spliced hexsteel integrally covers the boiler wall, and the anchor rod penetrates through the center holes of the semicircular cylinder I and the semicircular cylinder II. And the threaded connecting cylinders are sequentially screwed into the first threaded cylinder and the second threaded cylinder and gradually tightened until the deep positions in the threaded connecting cylinders are matched with threads on the outer side of the end of the anchor rod, the hexsteel is prevented from being disengaged in the axis direction of the anchor rod, the hexsteel is tightly attached to the surface of the furnace wall, and no loosening gap exists between the meshes. The surface of the hexsteel is coated with the refractory material, the polygonal holes and the protrusions which are densely distributed on the surface of the hexsteel form abundant gap intervals, the polygonal holes and the protrusions are integrated through the physical embedding effect, and the refractory material is effectively prevented from being layered or falling off due to thermal expansion and cold contraction, material scouring and the like.

Description

Technical Field

[0001] This utility model relates to the field of circulating fluidized bed boiler technology, and in particular to an anti-fall-off structure for the partition wall of a boiler return feeder. Background Technology

[0002] The boiler return feeder is a key component in a circulating fluidized bed boiler. Its main function is to separate high-temperature circulating materials (such as fly ash and unburned fuel particles) generated after combustion in the furnace from the separator and return them to the furnace for continued combustion or to participate in the circulation. Its role is to maintain the circulating balance of materials within the boiler, improve fuel combustion efficiency and desulfurization efficiency, and ensure stable boiler operation. The return feeder inlet is usually connected to the bottom of the separator, where the high-temperature materials (fly ash, unburned fuel particles, etc.) separated by the separator fall into the return feeder. A partition wall at the inlet guides the material along a designated path into the return feeder, preventing material accumulation or turbulent flow caused by the airflow from the separator outlet (carrying a small amount of flue gas or dust) colliding with the material flow.

[0003] During the operation of a circulating fluidized bed boiler, the furnace temperature typically reaches 800–1000℃, and in some areas (such as the dense phase zone and the return feeder), it can even be higher. Ordinary metallic materials (such as boiler steel) will oxidize, grow grains, or experience a decrease in strength at high temperatures. Long-term operation can easily lead to shell deformation, cracking, or even leakage. Therefore, existing boilers require coating their inner walls with high-temperature refractory materials. However, simply coating the refractory material cannot guarantee its stable fixation. When the boiler experiences drastic temperature changes during operation, the refractory material undergoes rapid heating and cooling, generating significant internal thermal stress, which can cause cracks and eventually detachment. Utility Model Content

[0004] This utility model provides an anti-detachment structure for the partition wall of a boiler return feeder, which solves the problem mentioned in the background art that the refractory material undergoes a rapid heating and cooling process, which generates large internal thermal stress, causing cracks in the refractory material and leading to its detachment.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an anti-detachment structure for a boiler return feeder partition wall, comprising a furnace wall, a hexagonal mesh, anchor rods, connecting component one, and connecting component two. An inlet pipe is provided at the upper end of the boiler separator. The furnace wall is vertically fixed inside the boiler separator below the inlet pipe. The hexagonal mesh is provided on both sides of the furnace wall. Multiple anchor rods are evenly distributed on both sides of the furnace wall. The hexagonal mesh is fixed to the furnace wall by the anchor rods. The hexagonal mesh is composed of multiple mesh structures linearly arranged and combined, consisting of mesh sheet one and mesh sheet two. Multiple connecting components one and multiple connecting components two are provided between mesh sheet one and mesh sheet two. Connecting components one and connecting components two are mated and sleeved on the outer periphery of the anchor rods.

[0006] Preferably, the first mesh and the second mesh are arranged symmetrically.

[0007] Preferably, the mesh sheet one includes a strip section one and a bend section one. The bend section one is fixed to one end of the strip section one. The strip section one and the bend section one are connected end to end to form a whole by a fixed connection. The mesh sheet one is formed by a linear arrangement and fixed of multiple strip sections one and bend sections one.

[0008] Preferably, the second mesh includes a second strip and a second bend. The second bend is fixed to one end of the second strip. The second strip and the second bend are connected end to end to form two integral parts. The second mesh is formed by a linear arrangement and fixed integral part composed of multiple second strips and second bends.

[0009] Preferably, a through groove is provided on the side of the first strip, and alignment posts are fixedly connected to both sides of the through groove.

[0010] Preferably, two inserts are fixedly connected to the side of the second strip. The inserts are inserted into and protrude from the through groove. A tube is fixedly connected to one side of the insert. An inner ring is fixedly connected to the inner opening of the tube. The end of the alignment post is inserted into the tube. The outer diameter of the end is the same as the inner diameter of the tube. The inner diameter of the inner ring is smaller than the outer diameter of the end.

[0011] Preferably, a connecting component is provided on the outer side of the first strip. The connecting component includes a connecting rod, a semi-cylinder, and a threaded cylinder. The connecting rod is fixed to the first bend, the semi-cylinder is fixed to the free end of the connecting rod, and the threaded cylinder is fixedly connected to the upper surface of the semi-cylinder.

[0012] Preferably, a connecting component two is provided on the outer side of the second strip. The connecting component two includes a connecting rod two, a semi-cylinder two, and a threaded cylinder two. The connecting rod two is fixed on the second bend, the semi-cylinder two is fixed on the free end of the connecting rod two, and the threaded cylinder two is fixedly connected to the upper surface of the semi-cylinder two.

[0013] Preferably, the first semi-cylinder and the second semi-cylinder are coaxially arranged and their side ends are aligned and fitted together. The first semi-cylinder and the second semi-cylinder are sleeved on the outer periphery of the anchor rod. The outer periphery of the first threaded cylinder and the second threaded cylinder are threadedly connected to a threaded connecting cylinder. The threaded connecting cylinder is threadedly connected to the anchor rod.

[0014] Preferably, multiple protrusions are evenly distributed and fixedly connected to the inner sidewalls of the first bend and the second bend, and multiple protrusions are evenly distributed and fixedly connected to the sidewalls of the first strip and the second strip on the same side as the inner sidewalls of the first bend and the second bend.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] Arrange mesh panels one and two according to the design sequence. Align the inserts of mesh panel two with the slots of mesh panel one and insert them, so that the alignment posts are embedded in the inserts. Use the inner ring to hold the post ends in place, completing the initial splicing of the mesh panels. Cover the furnace wall with the spliced ​​hexagonal mesh, so that the anchor rods pass through the center holes of semi-cylinder one and semi-cylinder two. Screw the threaded connecting sleeves into threaded sleeve one and threaded sleeve two in sequence, gradually tightening them until the inner depth of the threaded connecting sleeves engages with the threads on the outer side of the anchor rod ends, preventing the hexagonal mesh from coming off along the axis of the anchor rods. This ensures that the hexagonal mesh is tightly adhered to the furnace wall surface, with no loose gaps between the mesh panels. Finally, apply a high-temperature resistant and erosion-resistant refractory material to the surface of the hexagonal mesh. The densely distributed polygonal holes and protrusions on the surface of the hexagonal mesh create abundant gaps. When the refractory material is applied, it will penetrate into these gaps, tightly weaving the refractory material with the hexagonal mesh. This physical interlocking effect makes the two a whole, effectively preventing the refractory material from delaminating or falling off due to thermal expansion and contraction, material erosion, etc., and greatly improving the structural connection strength. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the anti-fall-off structure for the boiler return feeder partition wall of this utility model;

[0018] Figure 2 This is a schematic diagram of the anchor bolt installation position structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the tortoise shell mesh structure of this utility model;

[0020] Figure 4 for Figure 3 Enlarged view of point A;

[0021] Figure 5 This is a schematic diagram of the structure of mesh sheet one and mesh sheet two of this utility model in combination;

[0022] Figure 6 This is a schematic diagram of the structure of the connecting component one and connecting component two of this utility model in conjunction with the anchor rod;

[0023] Figure 7 This is a schematic diagram of the insert structure of this utility model.

[0024] Numbered in the diagram: 1. Boiler separator; 11. Inlet pipe; 12. Furnace wall; 2. Hexagonal mesh; 21. Mesh piece one; 211. Strip one; 2111. Through groove; 212. Bend one; 22. Mesh piece two; 221. Strip two; 222. Bend two; 3. Anchor bolt; 31. Threaded connecting cylinder; 4. Connecting assembly one; 41. Connecting rod one; 42. Semi-cylinder one; 43. Threaded cylinder one; 5. Connecting assembly two; 51. Connecting rod two; 52. Semi-cylinder two; 53. Threaded cylinder two; 6. Insert plate; 61. Insert cylinder; 62. Inner ring; 7. Alignment column; 8. Protrusion. Detailed Implementation

[0025] 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 scope of protection of the present utility model.

[0026] This utility model provides an anti-detachment structure for the partition wall of a boiler return feeder, such as... Figure 1 and Figure 2 As shown, the structure includes a furnace wall 12, a hexagonal mesh 2, anchor bolts 3, connecting component one 4, and connecting component two 5. An inlet pipe 11 is installed at the upper end of the boiler separator 1. Inside the boiler separator 1, below the inlet pipe 11, the furnace wall 12 is vertically fixed. Hexagonal mesh 2 is installed on both sides of the furnace wall 12, and multiple anchor bolts 3 are evenly distributed on both sides of the furnace wall 12. The ends of the anchor bolts 3 are threaded on their outer circumference. The furnace wall 12, as the core separating component inside the return feeder, plays a role in guiding material circulation and isolating high-temperature airflow. The evenly distributed anchor bolts 3 on both sides of the furnace wall 12 provide a stable supporting foundation for the external protective structure and reliable anchor points for subsequent structural installation. The tortoise shell mesh 2 is fixed to the furnace wall 12 by the anchor rod 3. The tortoise shell mesh 2 is composed of multiple mesh structures arranged linearly, consisting of mesh sheet 1 21 and mesh sheet 22. Multiple connecting components 1 4 and multiple connecting components 2 5 are set between mesh sheet 1 21 and mesh sheet 22. Connecting components 1 4 and connecting components 2 5 are mated and fixed on the outer periphery of the anchor rod 3.

[0027] like Figure 3 and Figure 5 As shown, mesh panel 1 21 and mesh panel 22 are symmetrically arranged. Mesh panel 1 21 includes strip 1 211 and bend 1 212. Bend 1 212 is fixed to one end of strip 1 211. Strip 1 211 and bend 1 212 are connected end-to-end to form a whole. Mesh panel 21 is formed by a linear arrangement and fixedly fixed of multiple strip 1 211 and bend 1 212. Mesh panel 22 includes strip 2 221 and bend 2 222. Bend 2 222 is fixed to one end of strip 2 221. Strip 2 221 and bend 2 222 are connected end-to-end to form two wholes. Mesh panel 22 is formed by a linear arrangement and fixedly fixed of multiple strip 2 221 and bend 222. Figure 4 and Figure 5 As shown, a through groove 2111 is provided through the side of the first strip 211, and alignment posts 7 are fixedly connected to both sides of the through groove 2111. Two inserts 6 are fixedly connected to the side of the second strip 221. The inserts 6 are inserted into and protrude from the through groove 2111. A tube 61 is fixedly connected to one side of the insert 6. An inner ring 62 is fixedly connected to the inner opening of the tube 61. The end of the alignment post 7 is inserted into the tube 61. The outer diameter of the end is the same as the inner diameter of the tube 61. The inner diameter of the inner ring 62 is smaller than the outer diameter of the end. In mesh panel 1 21 and mesh panel 2 22, strips 1 211 and 221 are aligned and fitted together. Insert 6 is inserted into through groove 2111 and protrudes from one side. Insert 6 is hammered and bent downwards. Insert cylinder 61 is sleeved on the outer periphery of the end of the alignment post 7. The upper surface of the inner ring 62 abuts against the upper surface of the end of the alignment post 7, limiting the end of the alignment post 7 and forming a mechanical locking structure. To prevent the fixing from being insecure, spot welding can be performed on insert 6 to further weld insert 6 to strips 1 211 and 221. Double fixing ensures the stability of the splicing of the turtle shell mesh 2 and prevents the mesh panels from misaligning and separating under high temperature expansion or external force, ensuring the overall integrity of the turtle shell mesh 2.

[0028] like Figure 6 and Figure 7As shown, a connecting component 4 is provided on the outer side of the first strip 211. The connecting component 4 includes a connecting rod 41, a semi-cylinder 42, and a threaded cylinder 43. The connecting rod 41 is fixed to the bend 212, the semi-cylinder 42 is fixed to the free end of the connecting rod 41, and the threaded cylinder 43 is fixedly connected to the upper surface of the semi-cylinder 42. A connecting component 5 is provided on the outer side of the second strip 221. The connecting component 5 includes a connecting rod 51, a semi-cylinder 52, and a threaded cylinder 53. The connecting rod 51 is fixed to the bend 222, the semi-cylinder 52 is fixed to the free end of the connecting rod 51, and the threaded cylinder 53 is fixedly connected to the upper surface of the semi-cylinder 52. Semi-cylinder 1 (42) and semi-cylinder 2 (52) are coaxially arranged and their side ends are aligned and fitted together. Semi-cylinder 1 (42) and semi-cylinder 2 (52) are fitted onto the outer periphery of the anchor rod 3. Threaded connecting cylinder 31 is threadedly connected to the outer periphery of threaded cylinder 1 (43) and threaded connecting cylinder 31, which is threadedly connected to the anchor rod 3. Connecting component 1 (4) and connecting component 2 (5) are key to achieving stable installation of the turtle-shell mesh 2. Semi-cylinder 1 (42) of connecting component 1 (4) and semi-cylinder 2 (52) of connecting component 2 (5) are coaxially fitted together. After being fitted onto the outer periphery of the anchor rod 3, they are fastened to the anchor rod 3 by the threaded connecting cylinder 31. This allows for quick installation while restraining the displacement of the turtle-shell mesh 2 from multiple directions. The semi-cylinders fit against the cylindrical surface of the anchor rod 3, limiting radial sway. After the threaded connecting cylinder 31 is tightened, it generates axial tension, firmly pressing the turtle-shell mesh 2 onto the furnace wall 12.

[0029] like Figure 5 and Figure 6 As shown, multiple protrusions 8 are evenly distributed and fixedly connected to the inner sidewalls of bend 1 (212) and bend 2 (222). Multiple protrusions 8 are also evenly distributed and fixedly connected to the sides of strip 1 (211) and strip 2 (221) on the same side as the inner sidewalls of bend 1 (212) and bend 2 (222). The densely distributed protrusions 8 on the mesh surface further enhance the protective performance of the hexagonal mesh 2. The protrusions 8 increase the contact area with the refractory material; when applying the refractory material, the material can embed into the gaps between the protrusions 8, forming a "teething" effect and improving adhesion.

[0030] Using this utility model, such as Figure 1 and Figure 2As shown, during construction, the installation positions of anchor rods 3 are marked on both sides of the constructed furnace wall 12. After drilling, the anchor rods 3 are inserted and grouted for fixation. Once they reach sufficient strength, the next step is performed. Next, mesh panels 1 21 and 22 are arranged in the design sequence. The inserts 6 of mesh panel 22 are aligned with the through slots 2111 of mesh panel 1 and inserted, so that the alignment post 7 is embedded in the insert cylinder 61. The inner ring 62 is used to hold the post end, completing the initial splicing of the mesh panels. Subsequently, the spliced ​​turtle shell mesh 2 is completely covered on the furnace wall 12, so that the anchor rods 3 pass through the center holes of semi-cylinder 1 42 and semi-cylinder 2 52. The threaded connecting cylinder 31 is screwed into threaded cylinder 1 43 and threaded cylinder 2 53 in sequence, and gradually tightened until the inner depth of the threaded connecting cylinder 31 engages with the threads on the outer side of the anchor rod 3 end, preventing the turtle shell mesh 2 from coming out along the axis of the anchor rod 3. The turtle shell mesh 2 is tightly attached to the surface of the furnace wall 12, and there are no loose gaps between the mesh panels. Finally, a high-temperature resistant and erosion-resistant refractory material is applied to the surface of the hexagonal mesh 2. The densely packed polygonal holes and protrusions 8 on the surface of the hexagonal mesh 2 create abundant gaps. When the refractory material is applied, it penetrates into these gaps, tightly weaving the refractory material and the hexagonal mesh 2 together. This physical interlocking effect makes the two a whole, effectively preventing the refractory material from delaminating or falling off due to thermal expansion and contraction, material erosion, etc., and significantly improving the structural connection strength.

[0031] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A structure for preventing detachment of a boiler feeder partition wall, comprising a furnace wall (12), an inlet pipe (11) provided at the upper end of a boiler separator (1), and the furnace wall (12) vertically fixed inside the boiler separator (1) below the inlet pipe (11), characterized in that, It also includes a tortoise shell mesh (2), anchor rods (3), connecting component one (4) and connecting component two (5). The tortoise shell mesh (2) is provided on both sides of the furnace wall (12). Multiple anchor rods (3) are evenly distributed on both sides of the furnace wall (12). The tortoise shell mesh (2) is fixed to the furnace wall (12) by the anchor rods (3). The tortoise shell mesh (2) is composed of multiple mesh structures arranged linearly from mesh one (21) and mesh two (22). Multiple connecting components one (4) and multiple connecting components two (5) are provided between mesh one (21) and mesh two (22). The connecting components one (4) and connecting components two (5) are mated and fixed on the outer periphery of the anchor rods (3).

2. The anti-fall-off structure for the boiler return feeder partition wall according to claim 1, characterized in that, The first mesh (21) and the second mesh (22) are arranged symmetrically.

3. The anti-fall-off structure for the boiler return feeder partition wall according to claim 2, characterized in that, The mesh panel (21) includes a strip (211) and a bend (212). The bend (212) is fixed to one end of the strip (211). The strip (211) and the bend (212) are connected end to end to form a whole. The mesh panel (21) is formed by a linear arrangement of multiple strips (211) and bends (212).

4. The anti-fall-off structure for the boiler return feeder partition wall according to claim 3, characterized in that, The second mesh (22) includes a second strip (221) and a second bend (222). The second bend (222) is fixed to one end of the second strip (221). The second strip (221) and the second bend (222) are connected end to end to form two wholes by a fixed connection. The second mesh (22) is formed by a linear arrangement of multiple second strips (221) and second bends (222).

5. The anti-fall-off structure for the boiler return feeder partition wall according to claim 4, characterized in that, A through groove (2111) is provided on the side of the strip (211), and a positioning post (7) is fixedly connected to both sides of the through groove (2111).

6. The anti-fall-off structure for the boiler return feeder partition wall according to claim 5, characterized in that, Two inserts (6) are fixedly connected to the side of the second strip (221). The inserts (6) are inserted into and protrude from the through groove (2111). A tube (61) is fixedly connected to one side of the insert (6). An inner ring (62) is fixedly connected to the inner opening of the tube (61). The end of the alignment post (7) is inserted into the tube (61). The outer diameter of the end is the same as the inner diameter of the tube (61). The inner diameter of the inner ring (62) is smaller than the outer diameter of the end.

7. The anti-fall-off structure for the boiler return feeder partition wall according to claim 4, characterized in that, A connecting component 4 is provided on the outer side of the strip 1 (211). The connecting component 1 (4) includes a connecting rod 1 (41), a semi-cylinder 1 (42) and a threaded cylinder 1 (43). The connecting rod 1 (41) is fixed on the bend 1 (212). The semi-cylinder 1 (42) is fixed to the free end of the connecting rod 1 (41). The threaded cylinder 1 (43) is fixedly connected to the upper surface of the semi-cylinder 1 (42).

8. The anti-fall-off structure for the boiler return feeder partition wall according to claim 7, characterized in that, A connecting component 2 (5) is provided on the outer side of the second strip (221). The connecting component 2 (5) includes a connecting rod 2 (51), a semi-cylinder 2 (52) and a threaded cylinder 2 (53). The connecting rod 2 (51) is fixed on the second bend (222). The semi-cylinder 2 (52) is fixed to the free end of the connecting rod 2 (51). The threaded cylinder 2 (53) is fixedly connected to the upper surface of the semi-cylinder 2 (52).

9. The anti-fall-off structure for the boiler return feeder partition wall according to claim 8, characterized in that, The first semi-cylinder (42) and the second semi-cylinder (52) are coaxially arranged and their side ends are aligned and fitted together. The first semi-cylinder (42) and the second semi-cylinder (52) are sleeved on the outer periphery of the anchor rod (3). The outer periphery of the first threaded cylinder (43) and the first threaded cylinder (43) are threadedly connected to the threaded connecting cylinder (31). The threaded connecting cylinder (31) and the anchor rod (3) are threadedly connected.

10. The anti-fall-off structure for the boiler return feeder partition wall according to claim 4, characterized in that, Multiple protrusions (8) are evenly distributed and fixedly connected on the inner sidewalls of the first bend (212) and the second bend (222), and multiple protrusions (8) are evenly distributed and fixedly connected on the sidewalls of the first strip (211) and the second strip (221) on the same side as the inner sidewalls of the first bend (212) and the second bend (222).

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