A flue reinforcement tie rod device

Abstract

This invention belongs to the field of expansion joint technology, and in particular to a flue gas reinforcement tie rod device, including a bellows and expansion joint flanges connected to both ends of the bellows. An inner liner is connected to the inner side of the bellows. A limit tie rod is connected between the two expansion joint flanges. The expansion joint flanges are fixed to the pipe flanges by flange bolts. One end of the pipe flange is connected to a flue gas pipe. The device includes a reinforcement component that applies pressure to the ruptured part of the bellows. The number of reinforcement components is not less than three. The reinforcement component in the middle applies pressure to the ruptured crack of the bellows. The reinforcement components on the left and right sides apply pressure towards the reinforcement component in the middle. The middle reinforcement component is used to squeeze the ruptured part, causing the outward rupture to shrink inward. At the same time, the other reinforcement components on both sides squeeze each other, which can squeeze the crack and reduce the crack gap, and reduce the impact of the bellows on the crack under expansion, contraction, and vibration.

Description

Technical Field

[0001] This invention belongs to the field of expansion joint technology, specifically relating to a flue reinforcement tie rod device. Background Technology

[0002] Expansion joints in desulfurization flue gas ducts are flexible connection devices installed on the flue gas pipelines of desulfurization systems. They are primarily used to compensate for displacement caused by thermal expansion and contraction, vibration, or foundation settlement, while also providing shock absorption and sealing. After long-term operation in a continuously high-temperature, high-humidity, and highly corrosive flue gas environment (containing SO2, SO3, chloride ions, etc.), the metal bellows of the expansion joints are prone to fatigue aging and corrosion thinning, leading to a decrease in flexible compensation capacity. Simultaneously, ash and scale accumulation inside the flue gas duct may interfere with the free expansion and contraction of the expansion joint, causing localized stress concentration. Over time, these problems may lead to the following failure risks for the expansion joint: cracks or perforations in the bellows, causing flue gas leakage; damage to the sealing structure; and other issues. This leads to an increase in system air leakage, affecting desulfurization efficiency and unit operating economy; in severe cases, it may cause component tearing or overall instability, resulting in abnormal stress on the flue support structure, and even triggering system shutdown for maintenance, affecting the safe and stable operation of the unit; once the expansion joint is structurally damaged, the emergency repair work is accompanied by high-temperature flue gas, and the damaged area will continue to increase, affecting the high-load operation of the unit. Currently, wrapping the expansion joint with ceramic fiber blankets or applying high-temperature mortar is a common emergency measure for the problem of expansion joint bursting, but the structural strength of this method is extremely low. Under flue gas pressure fluctuations and equipment vibration, the repair material is easily blown off or cracked. At the same time, it cannot isolate the continuous scouring of the damaged edge by the internal corrosive flue gas, and the damaged opening will expand rapidly. Summary of the Invention

[0003] To address the problems mentioned in the background section, this invention provides a flue reinforcement tie rod device. The device uses a central reinforcement member to compress the fractured area, causing the outwardly bursting crack to shrink inward. Simultaneously, other reinforcement members on both sides compress each other, which on one hand compresses the crack, reducing the crack gap, and on the other hand reduces the impact of the bellows on the crack under expansion, contraction, displacement, and vibration.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a flue reinforcement tie rod device, comprising a bellows and expansion joint flanges connected to both ends of the bellows, an inner liner connected to the inner side of the bellows, a limit tie rod connected between the two expansion joint flanges, the expansion joint flanges and the pipe flanges being fixedly installed by flange bolts, and a flue gas pipe connected to one end of the pipe flanges, characterized in that: it includes a reinforcement member that applies pressure to the rupture point of the bellows, the number of reinforcement members is not less than three, the reinforcement member located in the middle applies pressure to the crack of the ruptured bellows, and the reinforcement members located on the left and right sides apply pressure towards the reinforcement member located in the middle.

[0005] As a preferred embodiment of the flue reinforcement tie rod device of the present invention, the device includes a reinforcement structure comprising a reinforcement member and a connecting plate that moves with the reinforcement member. A rotating sleeve A is fixedly connected to the bottom of the connecting plate, a rotating component is rotatably connected to the inner side of the rotating sleeve A, a threaded rod A is threadedly connected to the inner side of the rotating component, a connecting column is fixedly connected to the bottom of the threaded rod A, and the bottom of the connecting column is fixedly connected to the top of the reinforcement member.

[0006] As a preferred embodiment of the flue reinforcement tie rod device of the present invention, the connecting column is made of a flexible material, and the Shore hardness of the connecting column and the reinforcement component is between 58 and 80.

[0007] As a preferred embodiment of the flue reinforcement tie rod device of the present invention, a fixing plate is fixedly connected to the top of the connecting plate, a cylindrical component is fixedly connected to the top of the fixing plate, and a rotating sleeve is rotatably connected to the outer side of the cylindrical component.

[0008] As a preferred embodiment of the flue reinforcement tie rod device of the present invention, a rotating sleeve B is fixedly connected to the top of the rotating sleeve in the middle, a threaded rod B is rotatably connected to the inner side of the rotating sleeve B, and two threaded sleeves are threadedly connected to the outer side of the threaded rod B. An outer sleeve is embedded at one end of the threaded sleeve, and the outer sleeve is rotatably connected to the threaded sleeve. A hexagonal part is provided at one end of the threaded sleeve.

[0009] As a preferred embodiment of the flue reinforcement tie rod device of the present invention, the remaining rotating sleeves are hinged to the outer sleeves on the upper side with threaded tie rods A, and the connecting plates at non-central locations are hinged to the outer sleeves on the lower side with threaded tie rods B via rotating brackets.

[0010] As a preferred embodiment of the flue reinforcement tie rod device of the present invention, the outer side of the threaded rod B is threaded with a rotating ball, and the top end of the threaded rod B is fixedly connected with a hard ring.

[0011] As a preferred embodiment of the flue reinforcement tie rod device of the present invention, it further includes a reinforcement connector for fixing the position of the reinforcement structure. The reinforcement connector includes a connecting base, the inner side of the connecting base is rotatably connected to a rotating ball, and movable pull claws are hinged at both ends of the connecting base. A U-shaped seat is rotatably connected to the end of the movable pull claw, and the U-shaped groove of the U-shaped seat is used to accommodate flange bolts.

[0012] As a preferred embodiment of the flue reinforcement tie rod device of the present invention, a toothed connector is rotatably connected to the inner side of one end of the U-shaped seat, a toothed ring is provided at one end of the U-shaped seat to cooperate with the toothed part of the toothed connector, and a nut is threadedly connected to the outer side of one end of the toothed connector.

[0013] As a preferred embodiment of the flue reinforcement tie rod device of the present invention, a spline shaft is provided on the outer side of the end of the snap-tooth connector, a screw is threadedly connected to the inner side of the end of the snap-tooth connector, and a spline sleeve is fixedly connected to the end of the movable pull claw.

[0014] Compared with existing technologies, the beneficial effects of this invention are as follows: Based on the traditional sealing method, the intermediate reinforcement is used to compress the rupture, causing the outward bursting crack to shrink inward. At the same time, other reinforcements on both sides compress each other, which on the one hand can compress the crack and reduce the crack gap, and on the other hand can reduce the impact of the bellows on the crack under expansion, displacement, and vibration. In other words, by using the reinforcements to compress each other from both sides, the elastic expansion and contraction of the bellows in relative intervals can be "locked". By reducing the elastic expansion and contraction, further damage to the crack can be avoided. This method can achieve normal use for several months, and when the factory's production capacity decreases, a new expansion joint can be replaced. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the expansion joint structure in this invention; Figure 3 This is a schematic diagram of the connection structure of the reinforcement structure in this invention; Figure 4 This is a schematic diagram of the overall structure of the reinforcement structure in this invention; Figure 5 This is a schematic diagram of the connection structure of the reinforced connector in this invention; Figure 6 This is a partial structural diagram of the reinforced connector in this invention; Figure 7 This is an exploded view of the reinforced connector in this invention; Figure 8 These are schematic diagrams of the structures of different reinforcement components in this invention; In the picture: 1. Bellows; 2. Expansion joint flange; 3. Inner liner; 4. Limiting tie rod; 5. Pipe flange; 6. Flange bolt; 7. Flue gas duct; 8. Reinforced connector; 9. Reinforcement structure; 81. Connecting base; 82. Movable pull claw; 83. U-shaped seat; 84. Snap ring; 85. Snap connector; 86. Nut; 87. Splined shaft; 88. Splined sleeve; 89. Screw; 91. Reinforcing component; 92. Connecting plate; 93. Rotating sleeve A; 94. Rotating component; 95. Threaded rod A; 96. Connecting column; 97. Fixing plate; 98. Cylindrical component; 99. Rotating ferrule; 910. Rotating sleeve B; 911. Threaded rod B; 912. Threaded sleeve; 913. Outer sleeve; 914. Threaded tie rod A; 915. Threaded tie rod B; 916. Rotating bracket; 917. Hexagonal part; 918. Rotating ball; 919. Hard ring. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] like Figures 1-8 As shown: A flue reinforcement tie rod device includes a bellows 1 and expansion joint flanges 2 connected to both ends of the bellows 1. An inner liner 3 is connected to the inner side of the bellows 1. A limit tie rod 4 is connected between the two expansion joint flanges 2. The expansion joint flanges 2 and the pipe flanges 5 are fixedly installed by flange bolts 6. One end of the pipe flange 5 is connected to a flue gas pipe 7. The device includes a reinforcement member 91 that applies pressure to the burst point of the bellows 1. The number of reinforcement members 91 is not less than three. The reinforcement member 91 located in the middle applies pressure to the crack in the burst point of the bellows 1. The reinforcement members 91 located on the left and right sides apply pressure towards the reinforcement member 91 located in the middle. The number of reinforcement members 91 is odd.

[0018] In this embodiment, the desulfurization flue gas expansion joint is a flexible connection device installed on the flue gas pipeline 7 of the desulfurization system. It is mainly used to compensate for displacement caused by thermal expansion and contraction, vibration, or foundation settlement, while also serving as a shock absorber and sealant. After long-term operation, in a flue gas environment characterized by continuous high temperature, high humidity, and high corrosiveness (containing SO2, SO3, chloride ions, etc.), the metal bellows 1 of the desulfurization flue gas expansion joint is prone to fatigue aging and corrosion thinning, leading to a decrease in its flexible compensation capacity. Simultaneously, ash and scale buildup inside the flue gas duct may interfere with the free expansion and contraction of the expansion joint, causing localized stress concentration. Over time, these problems may lead to the following failure risks for the expansion joint: cracks or perforations in the bellows 1, causing flue gas leakage; and sealing failure. Structural damage leads to increased system air leakage, affecting desulfurization efficiency and unit operating economy; in severe cases, component tearing or overall instability may occur, causing abnormal stress on the flue support structure, and even triggering system shutdown for maintenance, affecting the safe and stable operation of the unit; once the expansion joint is structurally damaged, the emergency repair work is accompanied by high-temperature flue gas, and the damaged area will continue to increase, affecting the high-load operation of the unit. Currently, wrapping the expansion joint with ceramic fiber blankets or applying high-temperature mortar is a common emergency measure for the problem of expansion joint bursting. However, the structural strength of this method is extremely low. Under flue gas pressure fluctuations and equipment vibration, the repair material is easily blown off or cracked. At the same time, it cannot isolate the continuous scouring of the damaged edge by the internal corrosive flue gas, and the damaged opening will expand rapidly. When the bellows 1 of the expansion joint ruptures, due to the dominance of internal pressure, the flue is under positive pressure (flue gas, hot air, exhaust gas, etc.), and the pressure always pushes the bellows 1 outward. The weak point will bulge outward and tear first. Secondly, the bellows 1 are designed to stretch outward and compress inward. When stretched, the wall is thinner and the stress is greater, making it easier to crack. The flue gas or dust inside mainly scours the inner wall. Even if the inner wall corrodes and cracks first, it will eventually burst outward under the action of internal pressure. Therefore, unless subjected to external force, it is basically difficult to see the cracks of the bellows 1 collapsing inward. Traditionally, the approach involves simply sealing the crack. However, this method is insufficient under conditions of internal gas pressure fluctuations, flue gas scouring, and equipment vibration. This solution does not abandon the traditional sealing method but instead uses a central reinforcement member 91 to compress the crack, causing the outward-bursting crack to shrink inward. Simultaneously, other reinforcement members 91 on both sides compress each other, which not only compresses the crack and reduces its size but also reduces the impact of bellows 1 on the crack due to expansion, contraction, and vibration. In other words, by using the reinforcement members 91 to compress each other from both sides, the elastic expansion and contraction of the bellows 1 within a certain range can be "locked." By reducing the amount of elastic expansion and contraction, further damage to the crack can be avoided. This method allows for normal use for several months, and when the factory's production capacity decreases, a new expansion joint can be replaced. like Figure 8As shown, the reinforcement 91 can be an arc-shaped cylinder or an arc-shaped concave structure. The concave structure can cover the outer surface of the bellows 1 when it breaks at the large diameter.

[0019] In an optional embodiment, the reinforcing structure 9, which includes the reinforcing member 91, also includes a connecting plate 92 that moves with the reinforcing member 91. A rotating sleeve A93 is fixedly connected to the bottom of the connecting plate 92. A rotating member 94 is rotatably connected to the inner side of the rotating sleeve A93. A threaded rod A95 is threadedly connected to the inner side of the rotating member 94. A connecting post 96 is fixedly connected to the bottom end of the threaded rod A95. The bottom of the connecting post 96 is fixedly connected to the top of the reinforcing member 91.

[0020] In this embodiment, by rotating the rotating component 94, the relative length between the rotating component 94 and the threaded rod A95 can be adjusted, thereby adjusting the diameter of the circle containing the arc of the reinforcing component 91, so that the reinforcing component 91 fits the size of the bellows 1 more closely; the rotating sleeve A93 and the rotating component 94 can be connected by a plug-in rotation, which is convenient for disassembly. After installation, since the connecting plate 92 is arc-shaped and the three rotating components 94 on the same connecting plate 92 have the same axis pointing in the same direction, they will not fall off without external force intervention due to the rigidity of the reinforcing component 91's own elasticity.

[0021] In an optional embodiment, the connecting post 96 is made of a flexible material, and the Shore hardness of the connecting post 96 and the reinforcement 91 is between 58 and 80.

[0022] In this embodiment, when the connecting post 96 and the reinforcing member 91 are made of flexible materials, they can adapt to the vibration and expansion / contraction of the bellows 1, avoiding interference caused by rigid contact. It should be noted that this device is only used for emergency treatment when the bellows 1 breaks, that is, emergency treatment is performed without stopping the machine. Therefore, for equipment that is in continuous operation, the bellows 1 will not experience thermal expansion and contraction due to start-up, shutdown, or seasonal changes. In other words, for pipeline equipment that is in continuous operation, the bellows 1 will not experience significant expansion and contraction, but only slight expansion and contraction to cope with the airflow vibration of the equipment. Therefore, according to the actual situation, it is better to choose a Shore hardness of 58 to 80 for the connecting post 96 and the reinforcing member 91. It will not be unable to provide support and compression force due to excessive softness, nor will it be unable to adjust or have rigid contact due to excessive hardness.

[0023] In an optional embodiment, a fixing plate 97 is fixedly connected to the top of the connecting plate 92, a cylindrical member 98 is fixedly connected to the top of the fixing plate 97, and a rotating sleeve 99 is rotatably connected to the outer side of the cylindrical member 98.

[0024] In this embodiment, the cylindrical part 98 and the rotating sleeve 99 can rotate relative to each other, thereby realizing the final angle adjustment of the reinforcement part 91.

[0025] In an optional embodiment, a rotating sleeve B910 is fixedly connected to the top of the rotating sleeve 99 located in the middle. A threaded rod B911 is rotatably connected to the inner side of the rotating sleeve B910. Two threaded sleeves 912 are threadedly connected to the outer side of the threaded rod B911. An outer sleeve 913 is embedded at one end of the threaded sleeve 912. The outer sleeve 913 is rotatably connected to the threaded sleeve 912. A hexagonal portion 917 is provided at one end of the threaded sleeve 912.

[0026] In this embodiment, when adjusting the overall height of the multiple reinforcement components 91, since the position of the rotating ball 918 is initially determined, the relative position between the threaded rod B911 and the rotating ball 918 can be changed by rotating the threaded rod B911. When rotating the threaded rod B911, the threaded sleeve 912 should be in a non-rotating state. The rotation of the threaded sleeve 912 can be restricted by using a wrench in conjunction with the hexagonal part 917.

[0027] In an optional embodiment, the remaining rotating sleeves 99 are hinged to the outer side of the upper outer sleeve 913 by threaded pull rods A914, and the connecting plates 92 at non-central locations are all hinged to the lower outer sleeve 913 by threaded pull rods B915 via rotating brackets 916.

[0028] In this embodiment, by adjusting the threaded tie rods A914 and B915, the distance and angle between the two side reinforcement members 91 can be adjusted, so that the two side reinforcement members 91 can move towards each other to clamp and squeeze the bellows 1.

[0029] In an optional embodiment, the outer side of the threaded rod B911 is threaded with a rotating ball 918, and the top end of the threaded rod B911 is fixedly connected with a hard ring 919.

[0030] In this embodiment, a rod-shaped object can be inserted into the rigid ring 919 to drive the threaded rod B911 to rotate.

[0031] In an optional embodiment, a reinforcement connector 8 is also included to fix the position of the reinforcement structure 9. The reinforcement connector 8 includes a connecting base 81, the inner side of which is rotatably connected to a rotating ball 918. Movable pull claws 82 are hinged to both ends of the connecting base 81, and a U-shaped seat 83 is rotatably connected to the end of the movable pull claws 82. The U-shaped groove of the U-shaped seat 83 is used to accommodate the flange bolts 6.

[0032] In this embodiment, when the movable pull claw 82 is fixed to the pipe flange 5, in order to prevent the movable pull claw 82 from detaching from the pipe flange 5 and to ensure the stability of the connection between the two, a U-shaped seat 83 is provided. The surface of the U-shaped seat 83 contacts the surface of the pipe flange 5, and the bottom of the U-shaped groove of the U-shaped seat 83 contacts the flange bolt 6, so that the flange bolt 6 limits the U-shaped seat 83 and prevents the U-shaped seat 83 from sliding off the pipe flange 5.

[0033] In an optional embodiment, a toothed connector 85 is rotatably connected to the inner side of one end of the U-shaped seat 83, a toothed ring 84 is provided at one end of the U-shaped seat 83 to engage with the toothed portion of the toothed connector 85, and a nut 86 is threadedly connected to the outer side of one end of the toothed connector 85.

[0034] In this embodiment, after the nut 86 is tightened, the toothed part of the toothed connector 85 can be tightly engaged with the toothed ring 84, thereby preventing the toothed connector 85 from rotating relative to the movable pull claw 82. This avoids the situation where the U-shaped seat 83 can rotate unrestricted relative to the movable pull claw 82 and flips off when subjected to the pushing force of the threaded rod B911.

[0035] In an optional embodiment, a spline shaft portion 87 is provided on the outer side of the end of the toothed connector 85, a screw 89 is threadedly connected to the inner side of the end of the toothed connector 85, and a spline sleeve 88 is fixedly connected to the end of the movable pull claw 82.

[0036] In this embodiment: by cooperating with the spline shaft portion 87 of the toothed connector 85 and the spline sleeve 88, the toothed connector 85 and the movable pull claw 82 can be fixed to prevent them from rotating. The screw 89 prevents them from separating and disassembling. This avoids the problem of insufficient internal operating space of the U-shaped seat 83 when installing the reinforcement structure 9.

[0037] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention 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 invention should be included within the protection scope of the present invention.

Claims

1. A flue gas reinforcement tie rod device, comprising a bellows (1) and expansion joint flanges (2) connected to both ends of the bellows (1), an inner liner (3) connected to the inner side of the bellows (1), a limit tie rod (4) connected between the two expansion joint flanges (2), the expansion joint flanges (2) and the pipe flange (5) being fixedly installed by flange bolts (6), and a flue gas pipe (7) connected to one end of the pipe flange (5), characterized in that: The device includes a reinforcement (91) that applies pressure to the ruptured part of the bellows (1). There are no fewer than three reinforcements (91). The reinforcement (91) located in the middle applies pressure to the crack in the ruptured bellows (1). The reinforcements (91) located on the left and right sides apply pressure towards the reinforcement (91) located in the middle.

2. The flue reinforcement tie rod device according to claim 1, characterized in that: The reinforcement structure (9) includes a reinforcement member (91) and a connecting plate (92) that moves with the reinforcement member (91). A rotating sleeve A (93) is fixedly connected to the bottom of the connecting plate (92). A rotating component (94) is rotatably connected to the inner side of the rotating sleeve A (93). A threaded rod A (95) is threadedly connected to the inner side of the rotating component (94). A connecting column (96) is fixedly connected to the bottom end of the threaded rod A (95). The bottom of the connecting column (96) is fixedly connected to the top of the reinforcement member (91).

3. The flue reinforcement tie rod device according to claim 2, characterized in that: The connecting post (96) is made of a flexible material, and the Shore hardness of the connecting post (96) and the reinforcing member (91) is between 58 and 80.

4. The flue reinforcement tie rod device according to claim 2, characterized in that: A fixing plate (97) is fixedly connected to the top of the connecting plate (92), a cylindrical part (98) is fixedly connected to the top of the fixing plate (97), and a rotating sleeve (99) is rotatably connected to the outside of the cylindrical part (98).

5. The flue reinforcement tie rod device according to claim 4, characterized in that: A rotating sleeve B (910) is fixedly connected to the top of the rotating sleeve (99) in the middle. A threaded rod B (911) is rotatably connected to the inner side of the rotating sleeve B (910). Two threaded sleeves (912) are threadedly connected to the outer side of the threaded rod B (911). An outer sleeve (913) is embedded at one end of the threaded sleeve (912). The outer sleeve (913) is rotatably connected to the threaded sleeve (912). A hexagonal part (917) is provided at one end of the threaded sleeve (912).

6. The flue reinforcement tie rod device according to claim 5, characterized in that: The remaining rotating sleeves (99) are hinged to the outer side of the upper outer sleeve (913) by threaded pull rod A (914), and the connecting plates (92) at non-central locations are all hinged to the lower outer sleeve (913) by threaded pull rod B (915) through rotating brackets (916).

7. The flue reinforcement tie rod device according to claim 5, characterized in that: The outer side of the threaded rod B (911) is threaded with a rotating ball (918), and the top end of the threaded rod B (911) is fixedly connected with a hard ring (919).

8. The flue reinforcement tie rod device according to claim 7, characterized in that: It also includes a reinforcing connector (8) that fixes the position of the reinforcing structure (9). The reinforcing connector (8) includes a connecting base (81), the inner side of which is rotatably connected to a rotating ball (918). The two ends of the connecting base (81) are hinged with movable claws (82), and the ends of the movable claws (82) are rotatably connected with U-shaped seats (83). The U-shaped groove of the U-shaped seat (83) is used to accommodate flange bolts (6).

9. The flue reinforcement tie rod device according to claim 8, characterized in that: A toothed connector (85) is rotatably connected to the inner side of one end of the U-shaped seat (83). A toothed ring (84) that mates with the toothed part of the toothed connector (85) is provided at one end of the U-shaped seat (83). A nut (86) is threadedly connected to the outer side of one end of the toothed connector (85).

10. The flue reinforcement tie rod device according to claim 9, characterized in that: The outer side of the end of the toothed connector (85) is provided with a spline shaft (87), the inner side of the end of the toothed connector (85) is threaded with a screw (89), and the end of the movable pull claw (82) is fixedly connected with a spline sleeve (88).

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