An expansion joint for the slag pipe of a circulating fluidized bed slag cooler

Abstract

This application relates to an expansion joint for the slag lower pipe of a circulating fluidized bed slag cooler, belonging to the technical field of expansion joints. It includes an inlet pipe, a ring pipe, and an outlet pipe. The inlet pipe is connected to the slag lower pipe, and the outlet pipe is connected to the slag cooler. The ring pipe is disposed on the inlet pipe and located between the inlet and outlet pipes. Corrugated pipes are connected to the inlet and outlet pipes, and the wall structure of the corrugated pipes adopts a multi-layer structure. By adopting a multi-layer structure for the corrugated pipe wall, this application increases the flexibility of the corrugated pipe while allowing it to absorb greater axial and lateral displacement, ensuring the expansion joint's absorption effect on thermal expansion. Furthermore, by eliminating the need for insulation cotton, the probability of the insulation cotton clumping and compressing the corrugated pipe, causing it to rupture, is reduced. Simultaneously, the expansion joint itself can dissipate heat normally, reducing the rate of creep and twisting of the slag lower pipe due to excessive temperature, and improving the service life of the expansion joint.

Description

Technical Field

[0001] This application relates to the technical field of expansion joints, and in particular to an expansion joint for the slag lower pipe of a circulating fluidized bed slag cooler. Background Technology

[0002] An expansion joint is a flexible element that can effectively compensate for axial deformation.

[0003] Currently, when a circulating fluidized bed boiler is operating, a large amount of high-temperature waste slag is generated inside the boiler. After being discharged through the slag discharge pipe, this waste slag needs to be cooled by a slag cooler. Therefore, the connection between the slag discharge pipe and the slag cooler will experience significant vertical and horizontal displacement due to the large temperature difference and thermal expansion on both sides. If a rigid connection is used between the slag discharge pipe and the slag cooler, stress concentration will occur, causing the slag discharge pipe to crack. Therefore, an expansion joint is needed to connect the slag discharge pipe and the slag cooler to absorb the thermal expansion at the connection point.

[0004] A typical expansion joint consists of a slag inlet pipe, an inner cylinder, a central corrugated pipe, insulation cotton, and a slag outlet pipe. The central corrugated pipe absorbs concentrated stress, and insulation cotton is filled between the central corrugated pipes inside the inner cylinder to reduce the working temperature of the corrugated pipes.

[0005] However, in the above technology, when the slag discharge pipe is blocked and slag discharge stops, a large amount of fine ash from the waste slag will flow back into the insulation cotton layer and be absorbed onto the insulation surface. At the same time, due to the temperature difference between the inside and outside of the insulation cotton, a lot of condensation will be generated on the insulation cotton. The combination of these fine ash and condensation will cause the insulation cotton to form hard lumps. The thermal expansion of the lumped insulation cotton will squeeze the external corrugated pipe, resulting in deformation or cracking of the corrugated pipe. Furthermore, the presence of the insulation cotton prevents the slag discharge pipe from dissipating heat normally, accelerating the creep and twisting speed of the slag discharge pipe and reducing its wear resistance and service life. Summary of the Invention

[0006] To ensure the effectiveness of the expansion joint and extend its service life, this application provides an expansion joint for the slag lower pipe of a circulating fluidized bed slag cooler.

[0007] This application provides an expansion joint for the slag lower pipe of a circulating fluidized bed slag cooler, which adopts the following technical solution:

[0008] An expansion joint for the slag lower pipe of a circulating fluidized bed slag cooler includes an inlet pipe, a ring pipe, and an outlet pipe. The inlet pipe is connected to the slag lower pipe, and the outlet pipe is connected to the slag cooler. The ring pipe is disposed on the inlet pipe and located between the inlet pipe and the outlet pipe. Corrugated pipes are connected to the inlet pipe and the outlet pipe, and the wall structure of the corrugated pipes adopts a multi-layer structure.

[0009] By adopting the above technical solution, the slag produced by the circulating fluidized bed boiler enters the expansion joint through the slag inlet pipe. The ring pipe guides the slag and leads it into the slag outlet pipe for discharge. At the same time, the corrugated pipe absorbs the thermal expansion generated by the high-temperature slag, thereby reducing the probability of the slag inlet and outlet pipes cracking. By using a multi-layer structure for the corrugated pipe wall, the flexibility of the corrugated pipe is increased, allowing it to absorb greater axial and lateral displacement, ensuring the expansion joint's absorption effect on thermal expansion. Furthermore, by eliminating the insulation cotton, the probability of the insulation cotton clumping and compressing the corrugated pipe, causing it to crack, is reduced. At the same time, the expansion joint itself can dissipate heat normally, reducing the rate of creep and twisting of the slag outlet pipe due to excessive temperature, and improving the service life of the expansion joint. The overall structure of the expansion joint is simple, easy to install, and more conducive to practical application.

[0010] Optionally, the corrugated pipe is divided into two sections, and a first connecting pipe is provided between the two sections of the corrugated pipe, and the two sections of the corrugated pipe are connected together through the first connecting pipe.

[0011] By adopting the above technical solution, the corrugated pipe is divided into two ends and the two ends of the corrugated pipe are connected together by a first connecting pipe. This allows the two corrugated pipes to better absorb radial displacement by utilizing the mutual eccentric misalignment between the two corrugated pipes when absorbing thermal expansion, thereby improving the overall absorption effect of the expansion joint on the radial displacement of thermal expansion.

[0012] Optionally, the annular pipe is located inside the corrugated pipe and the length of the annular pipe is greater than the length of the two corrugated pipe sections. A gap is left between the bottom end of the annular pipe and the slag discharge pipe to allow gas to pass through.

[0013] By adopting the above technical solution, the ring pipe is deeply inserted into the corrugated pipe, thereby isolating the waste residue from the corrugated pipe. This reduces the probability of waste residue accumulating on the corrugated pipe and damaging it. After entering the ring pipe, the waste residue will directly enter the slag discharge pipe along the inner wall of the ring pipe and be discharged, making it difficult for ash to accumulate inside the corrugated pipe. Furthermore, the corrugated pipe can still absorb thermal expansion through the gap between the ring pipe and the slag discharge pipe, ensuring the performance of the corrugated pipe.

[0014] Optionally, a second connecting pipe is provided between the slag discharge pipe and the corrugated pipe. The second connecting pipe has a slag-punching hole, and a slag-punching pipe communicating with the slag-punching hole is provided on the outer wall of the second connecting pipe. A sealing component is provided on the slag-punching pipe to seal the opening of the slag-punching pipe.

[0015] By adopting the above technical solution, a slag-clearing hole is opened on the second connecting pipe. When waste slag accumulates and blocks the corrugated pipe or slag discharge pipe, the slag-clearing pipe is opened through the sealing component, and the workers can use the slag-clearing hole to clear the accumulated waste slag. After clearing, the sealing component is closed. The overall structure is simple and practical.

[0016] Optionally, the sealing assembly includes:

[0017] A rotating shaft is rotatably mounted on a slag-pumping pipe, and the axial direction of the rotating shaft is parallel to the axial direction of the slag-pumping pipe.

[0018] An outer sealing plate is disposed on the rotating shaft and abuts against the outer wall of the second pipe.

[0019] An inner sealing plate is disposed on the end of the rotating shaft away from the outer sealing tube and abuts against the inner sidewall of the second connecting pipe.

[0020] A limiting component is disposed on the second connecting pipe and is used to limit the position of the outer sealing plate.

[0021] By adopting the above technical solution, the limiting component is unlocked, and the pipe opening of the slag-clearing pipe can be opened or closed by rotating the outer sealing plate. The movement of the outer sealing plate drives the movement of the inner sealing plate, and the inner and outer sealing plates rotate synchronously. When the outer sealing plate is closed, the inner sealing plate also blocks the inner pipe opening of the slag-clearing pipe, reducing the probability of waste slag falling into the slag-clearing pipe.

[0022] Optionally, the limiting member includes:

[0023] A limiting spring is provided, and a sliding hole is provided on the outer wall of the second connecting pipe. The limiting spring is disposed on the second connecting pipe.

[0024] A limiting block is slidably disposed on the second connecting pipe and connected to a limiting spring. A limiting hole is provided on the outer sealing plate. Under the action of the limiting spring, part of the limiting block extends out of the sliding hole and is inserted into the limiting hole.

[0025] By adopting the above technical solution, the movable limiting block moves into the sliding hole. The movement of the limiting block causes the limiting spring to compress. After the limiting block moves into the sliding hole, the outer sealing plate can be rotated to open the slag-clearing pipe opening. After the slag-clearing work is completed, the outer sealing plate is rotated to block the slag-clearing pipe opening, and the limiting block is released. Under the action of the limiting spring, part of the limiting block extends out of the sliding hole and is inserted into the limiting hole, thereby limiting the rotation position of the outer sealing plate.

[0026] Optionally, the end of the limiting block that protrudes from the sliding hole is provided with an arc-shaped guide surface.

[0027] By adopting the above technical solution, an arc-shaped guide surface is opened on one end of the limiting block that protrudes from the sliding hole. When the outer sealing plate moves to the point of contact with the limiting block, the guide surface generates a component force that pushes the limiting block into the sliding hole, eliminating the need for manual squeezing of the limiting block and improving work efficiency.

[0028] Optionally, the slag inlet pipe, ring pipe, slag outlet pipe, and corrugated pipe are all made of SUS310S stainless steel.

[0029] By adopting the above technical solution, the slag inlet pipe, ring pipe, slag outlet pipe, and corrugated pipe are all made of high-temperature resistant SUS310S stainless steel, thereby enhancing the overall structural strength of the expansion joint, reducing the probability of the expansion joint creeping and twisting due to the high temperature of the waste slag, and improving its service life.

[0030] Optionally, the corrugated pipe is provided with a first connecting pipe connected to the slag inlet pipe at one end, and a second connecting pipe is provided with the corrugated pipe near the second connecting pipe at one end, and a fixing component is provided on the first connecting pipe and the second connecting pipe to limit the length of the corrugated pipe during the installation of the expansion joint.

[0031] By adopting the above technical solution, when installing the slag inlet pipe and the slag outlet pipe, the fixing component is installed on the first connecting pipe and the second connecting pipe, thereby fixing the distance between the first connecting pipe and the second connecting pipe, reducing the probability of the bellows moving and misaligning during the installation of the expansion joint, and ensuring the installation accuracy of the expansion joint.

[0032] Optionally, the fixing component includes:

[0033] A first fixing plate and a second fixing plate, wherein the first fixing plate is disposed on the first connecting pipe and the second fixing plate is disposed on the second connecting pipe, and the axial directions of the first fixing plate and the second fixing plate are both perpendicular to the axial direction of the bellows.

[0034] A double-ended screw, wherein both ends of the double-ended screw pass through a first fixing plate and a second fixing plate, respectively;

[0035] Two fixing nuts are threaded to both ends of the double-ended screw and abut against the opposite side walls of the first fixing plate and the second fixing plate.

[0036] By adopting the above technical solution, the double-ended screw is moved through the first and second fixed plates, and two fixing nuts are screwed onto the two ends of the double-ended screw and respectively pressed against the opposite side walls of the first and second fixed plates, thereby completing the fixing of the distance between the first and second connecting pipes. After the expansion joint is installed, the two fixing nuts are screwed off from the double-ended screw, and the double-ended screw is removed, allowing the bellows to expand freely, ensuring the effectiveness of the expansion joint.

[0037] In summary, this application includes at least one of the following beneficial technical effects:

[0038] 1. The waste residue is guided by the ring pipe and discharged into the slag outlet pipe. At the same time, the corrugated pipe absorbs the thermal expansion generated by the high temperature waste residue, thereby reducing the probability of the slag inlet pipe and slag outlet pipe being cracked.

[0039] 2. By adopting a multi-layer structure for the wall of the bellows, the flexibility of the bellows is increased, while the bellows can absorb a larger amount of axial and lateral displacement, thus ensuring the absorption effect of the expansion joint on thermal expansion.

[0040] 3. By eliminating the insulation cotton, the probability of the bellows breaking due to the insulation cotton clumping and squeezing is reduced. At the same time, the expansion joint can dissipate heat normally, reducing the speed at which the slag discharge pipe creeps and twists due to excessive temperature, and improving the service life of the expansion joint. Attached Figure Description

[0041] Figure 1 This is a three-dimensional structural diagram of this application;

[0042] Figure 2 yes Figure 1 A cross-sectional schematic diagram of AA in the middle;

[0043] Figure 3 yes Figure 2 Enlarged schematic diagram of section B.

[0044] Reference numerals in the attached drawings: 11. Slag inlet pipe; 12. Slag outlet pipe; 13. Ring pipe; 14. First connecting pipe; 15. Second connecting pipe; 16. First connecting pipe; 17. Second connecting pipe; 18. Corrugated pipe; 21. Slag removal hole; 22. Slag removal pipe; 3. Sealing assembly; 31. Rotating shaft; 32. Outer sealing plate; 33. Inner sealing plate; 34. Limiting component; 35. Limiting spring; 36. Limiting block; 37. Sliding hole; 38. Guide surface; 4. Fixing assembly; 41. First fixing plate; 42. Second fixing plate; 43. Double-ended screw; 44. Fixing nut. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1 - Appendix Figure 3 This application will be described in further detail.

[0046] This application discloses an expansion joint for the slag lower pipe of a circulating fluidized bed slag cooler.

[0047] Reference Figure 1 and Figure 2 The expansion joint of the slag lower pipe of the circulating fluidized bed slag cooler includes an inlet pipe 11 connected to the slag lower pipe and an outlet pipe 12 connected to the slag cooler. A ring pipe 13 is fixedly connected to the end wall of the inlet pipe 11 near the outlet pipe 12. The ring pipe 13 is coaxial with the inlet pipe 11 and the outlet pipe 12.

[0048] Reference Figure 1 and Figure 2A first connecting pipe 14 is fixedly connected to the outer wall of the connection between the slag inlet pipe 11 and the ring pipe 13. A second connecting pipe 17 is fixedly connected to the end wall of the slag outlet pipe 12 near the slag inlet pipe 11. The side wall of the second connecting pipe 17 is inclined, and the cross-sectional diameter of the side of the second connecting pipe 17 near the slag inlet pipe 11 is larger than the cross-sectional diameter of the side connected to the slag outlet pipe 12. A gap is left between the ring pipe 13 and the second connecting pipe 17 for gas to pass through. A second connecting pipe 15 is fixedly connected to the end wall of the second connecting pipe 17 near the first connecting pipe 14.

[0049] Reference Figure 1 A corrugated pipe 18 is fixedly connected to the end walls of the first connecting pipe 14 and the second connecting pipe 15 at opposite ends. The corrugated pipe 18 is divided into two sections, and a first connecting pipe 16 is fixedly connected between the two sections of the corrugated pipe 18. The wall of the corrugated pipe 18 adopts a multi-layer structure.

[0050] Reference Figure 1 and Figure 2 The high-temperature waste slag enters the ring pipe 13 from the slag inlet pipe 11. The ring pipe 13 guides the waste slag into the slag outlet pipe 12 and then discharges it into the slag cooler for cooling. The thermal expansion in the ring pipe 13 is transferred to the two corrugated pipes 18 through the gap between the ring pipe 13 and the second connecting pipe 17. The two corrugated pipes 18 absorb the thermal expansion.

[0051] Reference Figure 2 The second connector 17 has a slag-removing hole 21 on its outer wall that communicates with the interior of the second connector 17. A slag-removing pipe 22 that communicates with the slag-removing hole 21 is fixedly connected to the outer wall of the second connector 17. A sealing component 3 is provided on the slag-removing pipe 22 for sealing the ports at both ends of the slag-removing pipe 22.

[0052] Reference Figure 2 and Figure 3 The sealing assembly 3 includes a rotating shaft 31, an outer sealing plate 32, an inner sealing plate 33, and a limiting member 34. The rotating shaft 31 is rotatably connected to the slag-pumping pipe 22 and its axial direction is parallel to the axial direction of the slag-pumping pipe 22. The outer sealing plate 32 and the inner sealing plate 33 are respectively fixedly connected to both ends of the rotating shaft 31. The outer sealing plate 32 abuts against the end wall of the slag-pumping pipe 22 away from the second connecting pipe 17, and the inner sealing plate 33 abuts against the end wall of the slag-pumping pipe 22 located inside the second connecting pipe 17. The inner sealing plate 33 and the outer sealing plate 32 cooperate to seal the slag-pumping pipe 22.

[0053] Reference Figure 2 and Figure 3The limiting component 34 is used to limit the rotational position of the outer sealing plate 32. The limiting component 34 includes a limiting spring 35 and a limiting block 36. A sliding hole 37 is axially formed on the end wall of the slag-clearing pipe 22 near the outer sealing plate 32. The limiting spring 35 is fixedly connected to the bottom wall of the sliding hole 37. The limiting block 36 is slidably mounted on the sliding hole 37 and fixedly connected to the limiting spring 35. Under the action of the limiting spring 35, the end of the limiting block 36 near the outer sealing plate 32 protrudes out of the sliding hole 37.

[0054] Reference Figure 2 and Figure 3 When the outer sealing plate 32 seals the opening of the slag-removing pipe 22, a limiting hole is provided at the corresponding position of the outer sealing plate 32 and the sliding hole 37, and the limiting block 36 is inserted into the limiting hole. An arc-shaped guide surface 38 is provided on the side wall of the end of the limiting block 36 that is inserted into the limiting hole.

[0055] Reference Figure 1 and Figure 2 The first connecting pipe 14 and the second connecting pipe 15 are provided with multiple sets of fixing components 4 to fix the distance between the first connecting pipe 14 and the second connecting pipe 15 when the expansion joint is installed. The fixing components 4 include a first fixing plate 41, a second fixing plate 42, a double-ended screw 43 and two fixing nuts 44.

[0056] Reference Figure 1 and Figure 2 The first fixing plate 41 is fixedly connected to the outer wall of the first connecting pipe 14, and the second fixing plate 42 is fixedly connected to the outer wall of the second connecting pipe 15. The two ends of the double-ended screw 43 pass through the first fixing plate 41 and the second fixing plate 42 respectively. Two fixing nuts 44 are threaded onto the double-ended screw 43 and are located at both ends of the double-ended screw 43, abutting against the opposite side walls of the first fixing plate 41 and the second fixing plate 42.

[0057] Reference Figure 1 and Figure 2 After the expansion joint is installed, loosen the two fixing nuts 44 to disengage them from the double-ended screw 43. Then remove the double-ended screw 43 to allow the two bellows sections 18 to expand and move freely.

[0058] Reference Figure 1 and Figure 2 The slag inlet pipe 11, ring pipe 13, slag outlet pipe 12 and corrugated pipe 18 on the expansion joint are all made of SUS310S stainless steel.

[0059] The working principle of this application embodiment is as follows:

[0060] The slag produced by the circulating fluidized bed boiler enters the expansion joint through the slag inlet pipe 11. The ring pipe 13 guides the slag into the slag outlet pipe 12 and discharges it into the slag cooler for cooling. At the same time, the two corrugated pipes 18 absorb the thermal expansion generated by the high-temperature slag, thereby reducing the probability of the slag inlet pipe 11 and the slag outlet pipe 12 cracking. By adopting a multi-layer structure for the pipe wall of the corrugated pipe 18, the flexibility of the corrugated pipe 18 is increased, allowing it to absorb greater axial and lateral displacement, ensuring the expansion joint's absorption effect on thermal expansion. Furthermore, by eliminating the insulation cotton, the probability of the insulation cotton clumping and compressing the corrugated pipe 18, causing it to crack, is reduced. At the same time, the expansion joint itself can dissipate heat normally, reducing the rate of creep and twisting of the slag outlet pipe due to excessive temperature, and improving the service life of the expansion joint. The overall structure of the expansion joint is simple, easy to install, and more conducive to practical application.

[0061] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An expansion joint for the slag lower pipe of a circulating fluidized bed slag cooler, characterized in that: It includes a slag inlet pipe (11), a ring pipe (13) and a slag outlet pipe (12). The slag inlet pipe (11) is connected to the slag outlet pipe, and the slag outlet pipe (12) is connected to the slag cooler. The ring pipe (13) is arranged on the slag inlet pipe (11) and located between the slag inlet pipe (11) and the slag outlet pipe (12). Corrugated pipes (18) are connected to the slag inlet pipe (11) and the slag outlet pipe (12). The wall structure of the corrugated pipe (18) adopts a multi-layer structure. The corrugated pipe (18) is divided into two sections, and a first connecting pipe (16) is provided between the two sections of the corrugated pipe (18). The two sections of the corrugated pipe (18) are connected together through the first connecting pipe (16). A second connecting pipe (17) is provided between the slag discharge pipe (12) and the corrugated pipe (18). A slag-punching hole (21) is provided on the second connecting pipe (17). A slag-punching pipe (22) communicating with the slag-punching hole (21) is provided on the outer wall of the second connecting pipe (17). A sealing component (3) is provided on the slag-punching pipe (22) to seal the opening of the slag-punching pipe (22). The sealing assembly (3) includes: A rotating shaft (31) is rotatably mounted on a slag-pumping pipe (22), and the axial direction of the rotating shaft (31) is parallel to the axial direction of the slag-pumping pipe (22). An outer sealing plate (32) is disposed on the rotating shaft (31) and abuts against the outer wall of the second connecting pipe (17); The inner sealing plate (33) is disposed on the end of the rotating shaft (31) away from the outer sealing tube and abuts against the inner wall of the second connecting pipe (17); A limiting member (34) is provided on the second pipe (17) and is used to limit the position of the outer sealing plate (32); The limiting member (34) includes: A limiting spring (35) is provided on the outer wall of the second connecting pipe (17), and a sliding hole (37) is provided on the second connecting pipe (17). The limiting block (36) is slidably disposed on the second connecting pipe (17) and connected to the limiting spring (35). The outer sealing plate (32) has a limiting hole. Under the action of the limiting spring (35), the limiting block (36) partially protrudes out of the sliding hole (37) and is inserted into the limiting hole.

2. The expansion joint for the slag lower pipe of a circulating fluidized bed slag cooler according to claim 1, characterized in that: The annular pipe (13) is located inside the corrugated pipe (18) and the length of the annular pipe (13) is greater than the length of the two corrugated pipes (18). A gap is left between the bottom end of the annular pipe (13) and the slag discharge pipe (12) for gas to pass through.

3. The expansion joint for the slag lower pipe of a circulating fluidized bed slag cooler according to claim 1, characterized in that: The limiting block (36) has an arc-shaped guide surface (38) on one end that protrudes from the sliding hole (37).

4. The expansion joint for the slag lower pipe of a circulating fluidized bed slag cooler according to claim 1, characterized in that: The slag inlet pipe (11), ring pipe (13), slag outlet pipe (12) and corrugated pipe (18) are all made of SUS310S stainless steel.

5. The expansion joint for the slag lower pipe of a circulating fluidized bed slag cooler according to claim 1, characterized in that: The corrugated pipe (18) is provided with a first connecting pipe (14) connected to the slag inlet pipe (11) at one end, and a second connecting pipe (15) connected to the second connecting pipe (17) at the other end. The first connecting pipe (14) and the second connecting pipe (15) are provided with a fixing component (4) that limits the length of the corrugated pipe (18) when the expansion joint is installed.

6. The expansion joint for the slag lower pipe of a circulating fluidized bed slag cooler according to claim 5, characterized in that: The fixing component (4) includes: A first fixing plate (41) and a second fixing plate (42), wherein the first fixing plate (41) is disposed on the first connecting pipe (14) and the second fixing plate (42) is disposed on the second connecting pipe (15), and the axial directions of the first fixing plate (41) and the second fixing plate (42) are both perpendicular to the axial direction of the corrugated pipe (18); A double-ended screw (43), the two ends of which pass through the first fixing plate (41) and the second fixing plate (42) respectively; Two fixing nuts (44) are threaded to both ends of the double-ended screw (43) and abut against the opposite side walls of the first fixing plate (41) and the second fixing plate (42).

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