A new type of high temperature expansion joint for flue gas turbine outlet

Abstract

The invention discloses a novel high-temperature expansion joint at the outlet of a flue gas turbine, comprising: an upper pipe assembly, a three-way assembly, an intermediate pipe assembly, a proportional connecting rod assembly, a lower pipe assembly, a first bellows, a second bellows and a third bellows; the upper pipe assembly, the first bellows, the three-way assembly, the second bellows, the intermediate pipe assembly, the third bellows and the lower pipe assembly are connected in sequence; the proportional connecting rod assembly is installed on the outside of the novel high-temperature expansion joint at the outlet of the flue gas turbine, and is located between one end of the three-way assembly close to the second bellows and the lower pipe assembly. The invention effectively reduces the force acting on the outlet flange of the flue gas turbine, and ensures the normal operation of the flue gas turbine.

Description

Technical Field

[0001] The invention belongs to the technical field of expansion joints, and in particular relates to a novel high-temperature expansion joint at a flue gas turbine outlet. Background Art

[0002] In the energy recovery system of the catalytic cracking unit, the flue gas turbine is the core equipment of the entire system. In order to ensure the flexibility of the flue gas turbine outlet pipeline, an expansion joint is generally set at the flue gas turbine outlet. According to the pipeline direction, the expansion joint is generally a bend pressure balance expansion joint. The flue gas turbine has strict requirements on its stress. In order to ensure its normal and stable operation, it is necessary to strictly control the stress of the flue gas turbine outlet so that its stress meets the requirements. This requires that while meeting the pipeline flexibility requirements, the stress of the flue gas turbine should be reduced as much as possible.

[0003] The forces acting on the flue gas turbine by the expansion joint mainly include its own gravity, stiffness reaction force, pressure thrust, etc. When an abnormality occurs, the above forces will act on the flue gas turbine outlet flange, which will cause the flue gas turbine to fail to operate normally. How to reduce these forces is the design point of the expansion joint. Summary of the invention

[0004] The technology of the present invention solves the problem: overcomes the shortcomings of the prior art, provides a new type of flue gas turbine outlet high-temperature expansion joint, effectively reduces the force acting on the flue gas turbine outlet flange, and ensures the normal operation of the flue gas turbine.

[0005] In order to solve the above technical problems, the present invention discloses a novel high-temperature expansion joint for a flue gas turbine outlet, comprising: an upper pipe assembly, a tee assembly, an intermediate pipe assembly, a proportional connecting rod assembly, a lower pipe assembly, a first bellows, a second bellows and a third bellows;

[0006] The upper connecting pipe assembly, the first bellows, the three-way assembly, the second bellows, the middle connecting pipe assembly, the third bellows and the lower connecting pipe assembly are connected in sequence;

[0007] The proportional connecting rod assembly is installed outside the high-temperature expansion joint at the outlet of the novel flue gas turbine and is located between one end of the three-way assembly close to the second bellows and the lower connecting pipe assembly.

[0008] The above-mentioned novel high-temperature expansion joint at the outlet of flue gas turbine also includes: a sealing head; wherein the sealing head is welded to the upper connecting pipe assembly to achieve sealing.

[0009] The above-mentioned novel high-temperature expansion joint at the outlet of flue gas turbine further comprises: a first protective cover, a second protective cover and a third protective cover;

[0010] The first protective cover, the second protective cover and the third protective cover are respectively arranged on the outside of the first bellows, the second bellows and the third bellows to protect the bellows during transportation and installation;

[0011] The two ends of the first protective cover are respectively welded and fixed to the upper pipe assembly and the tee assembly; the two ends of the second protective cover are respectively welded and fixed to the tee assembly and the middle pipe assembly; the two ends of the third bellows are respectively welded and fixed to the middle pipe assembly and the lower pipe assembly.

[0012] In the above-mentioned novel high-temperature expansion joint at the outlet of flue gas turbine, a first end plate assembly is arranged at one end of the three-way assembly close to the second bellows, a universal ring is arranged on the outer surface of the middle pipe assembly, and a second end plate assembly is arranged at one end of the lower pipe assembly close to the third bellows;

[0013] The proportional connecting rod assembly is installed and fixed through the first end plate assembly, the universal ring and the second end plate assembly.

[0014] In the above-mentioned novel flue gas turbine outlet high-temperature expansion joint, the proportional connecting rod assembly includes: universal joint I, universal joint II, universal joint III, cross plate, proportional connecting rod I, proportional connecting rod II, proportional connecting rod III, proportional connecting rod IV, proportional connecting rod V, proportional connecting rod VI, proportional connecting rod VII and proportional connecting rod VII;

[0015] Universal joints Ⅰ, Ⅱ and Ⅲ are arranged in parallel and at equal intervals;

[0016] The transverse plate passes through the universal joint I, the universal joint II and the universal joint III in a transverse direction and is hinged to the universal joint I, the universal joint II and the universal joint III respectively;

[0017] The proportional link I and the proportional link II are hinged and installed between the universal joint I and the universal joint II;

[0018] Proportional link III and proportional link IV are hinged and installed between universal joint I and universal joint II;

[0019] The proportional link V and the proportional link VI are hinged and installed between the universal joint II and the universal joint III;

[0020] Proportional link VII is hinged with proportional link VII and installed between universal joint II and universal joint III.

[0021] The above-mentioned novel high-temperature expansion joint at the outlet of flue gas turbine further comprises: a first guide tube, a second guide tube and a third guide tube;

[0022] The first guide tube is welded and fixed to one end of the three-way assembly close to the first bellows;

[0023] The second guide tube is welded and fixed to one end of the intermediate pipe assembly close to the second bellows;

[0024] The third guide tube is welded and fixed to one end of the lower connecting pipe assembly close to the third bellows.

[0025] The above-mentioned novel high-temperature expansion joint for flue gas turbine outlet also includes: a force-bearing universal joint assembly;

[0026] The force-bearing universal joint assembly is arranged between the upper connecting pipe assembly and the lower connecting pipe assembly, and is used for absorbing the pressure thrust generated by the internal pressure of the bellows.

[0027] In the above-mentioned novel high-temperature expansion joint at the outlet of flue gas turbine, the force-bearing universal joint assembly includes: a first guide plate, a second guide plate, a pull plate, a first universal joint pull plate, a second universal joint pull plate, a first cross pin assembly, a hinge plate assembly and a second cross pin assembly; wherein the first guide plate and the second guide plate are symmetrically arranged on both sides of the center of the three-way assembly; the first cross pin assembly and the second cross pin assembly are respectively located at the center of the second bellows and the third bellows; the first guide plate and the second guide plate are welded to the outside of the three-way assembly at a set interval;

[0028] One end of the pull plate is welded and fixed to the third end plate assembly arranged on the upper pipe assembly, and the other end is connected to the first cross pin assembly after passing through the first guide plate and the second guide plate; one end of the hinge plate assembly is installed on the outside of the lower pipe assembly, and the other end is connected to the second cross pin assembly;

[0029] The first universal joint pull plate and the second universal joint pull plate are arranged in parallel, and both ends are connected by a first cross pin shaft assembly and a second cross pin shaft assembly respectively.

[0030] In the above-mentioned novel high-temperature expansion joint at the outlet of flue gas turbine, the first guide plate, the second guide plate, the pull plate and the hinge plate assembly are located on the same axis.

[0031] The above-mentioned novel high-temperature expansion joint for flue gas turbine outlet also includes: a constant force spring assembly, a flue gas turbine frame and a tie rod assembly;

[0032] One end of the pull rod assembly is connected via a fourth end plate assembly arranged on the lower connecting pipe assembly, and the other end is connected to the constant force spring assembly via a flue gas turbine frame.

[0033] The present invention has the following advantages:

[0034] The invention discloses a novel high-temperature expansion joint for a flue gas turbine outlet, which changes the previous product structure, effectively reduces the force acting on the flue gas turbine outlet flange, ensures the normal operation of the flue gas turbine, and improves the stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 2 is a schematic structural diagram of a novel high-temperature expansion joint at a flue gas turbine outlet according to an embodiment of the present invention;

[0036] Figure 2 It is a partial schematic diagram of a novel high-temperature expansion joint at the outlet of a flue gas turbine in an embodiment of the present invention;

[0037] Figure 3 is a structural schematic diagram of a proportional connecting rod assembly in an embodiment of the present invention;

[0038] Figure 4 It is a top view of a novel high-temperature expansion joint at the outlet of a flue gas turbine in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] Example 1

[0041] like Figure 1 In this embodiment, the new flue gas turbine outlet high-temperature expansion joint includes: an upper pipe assembly 2, a three-way assembly 4, an intermediate pipe assembly 10, a proportional connecting rod assembly 11, a lower pipe assembly 12, a first bellows 91, a second bellows 92 and a third bellows 93.

[0042] The specific connection relationship is as follows: the upper connecting pipe assembly 2, the first bellows 91, the tee assembly 4, the second bellows 93, the middle connecting pipe assembly 10, the third bellows 93 and the lower connecting pipe assembly 12 are connected in sequence; the proportional connecting rod assembly 11 is installed on the outside of the high-temperature expansion joint at the outlet of the new flue gas turbine, and is located between the end of the tee assembly 4 close to the second bellows 92 and the lower connecting pipe assembly 12.

[0043] Preferably, the proportional connecting rod assembly 11 is used to evenly distribute the lateral and axial displacements of the second bellows 92 and the third bellows 93, transfer the weight of the intermediate connecting pipe assembly 10 to the three-way assembly 4, and reduce the influence of the weight of the intermediate connecting pipe assembly 10 on the bellows.

[0044] Preferably, the end of the three-way assembly 4 close to the second bellows 92 is provided with a first end plate assembly 71, the outer surface of the middle pipe assembly 10 is provided with a universal ring 18, and the end of the lower pipe assembly 12 close to the third bellows 93 is provided with a second end plate assembly 72. The proportional link assembly 11 is installed and fixed by the first end plate assembly 71, the universal ring 18 and the second end plate assembly 72.

[0045] In a preferred embodiment of the present invention, the novel flue gas turbine outlet high-temperature expansion joint may further include: a sealing head 1. The sealing head 1 is welded to the upper pipe assembly 2 to achieve sealing.

[0046] In a preferred embodiment of the present invention, the novel flue gas turbine outlet high temperature expansion joint may further include: a first protective cover 161, a second protective cover 162 and a third protective cover 163. The first protective cover 161, the second protective cover 162 and the third protective cover 163 are respectively arranged on the outside of the first bellows 91, the second bellows 92 and the third bellows 93 to protect the bellows during transportation and installation.

[0047] Specifically: the two ends of the first protective cover 161 are respectively welded and fixed to the upper pipe assembly 2 and the tee assembly 4; the two ends of the second protective cover 162 are respectively welded and fixed to the tee assembly 4 and the middle pipe assembly 10; the two ends of the third bellows 93 are respectively welded and fixed to the middle pipe assembly 10 and the lower pipe assembly 12.

[0048] In a preferred embodiment of the present invention, the novel flue gas turbine outlet high-temperature expansion joint may further include: a first flow guide tube 31 , a second flow guide tube 32 and a third flow guide tube 33 .

[0049] Preferably, the first guide cylinder 31 is welded and fixed to one end of the three-way assembly 4 close to the first bellows 91; the second guide cylinder 32 is welded and fixed to one end of the middle connecting pipe assembly 10 close to the second bellows 92; the third guide cylinder 33 is welded and fixed to one end of the lower connecting pipe assembly 12 close to the third bellows 93.

[0050] In a preferred embodiment of the present invention, the novel flue gas turbine outlet high temperature expansion joint may further include: a force-bearing universal joint assembly 8. The force-bearing universal joint assembly 8 is arranged between the upper pipe assembly 2 and the lower pipe assembly 12, and is used to absorb the pressure thrust generated by the internal pressure of the bellows.

[0051] In a preferred embodiment of the present invention, Figure 2 The novel flue gas turbine outlet high temperature expansion joint may also include: a constant force spring assembly 13, a flue gas turbine frame 14 and a tie rod assembly 15. One end of the tie rod assembly 15 is connected through a fourth end plate assembly 74 arranged on the lower pipe assembly 12, and the other end is connected to the constant force spring assembly 13 through the flue gas turbine frame 14.

[0052] Preferably, in practical applications, a suitable constant force spring assembly can be selected according to the actual load of the expansion joint to absorb the load generated by the expansion joint. As the device becomes larger and larger, the load becomes larger and larger, and the size of the constant force spring becomes larger and larger, the constant force spring can no longer be placed in the flue gas turbine outlet frame. Therefore, in this embodiment, the traditional double-hanging point constant force spring is replaced with a seat-type constant force spring assembly, which is placed on the flue gas turbine frame.

[0053] In a preferred embodiment of the present invention, the proportional connecting rod assembly adopts a universal proportional connecting rod structure, so that the expansion joint can absorb lateral displacement in multiple directions, ensuring that the expansion joint does not affect the deformation of the bellows when absorbing lateral displacement in multiple directions, and the displacement distribution is balanced. In addition, a load-bearing horizontal plate is added to the proportional connecting rod assembly, so that the weight of the intermediate connecting rod assembly can be transferred to the three-way assembly through the horizontal plate, and the weight of the intermediate connecting rod assembly does not affect the bellows during operation.

[0054] Preferably, Figure 3 The proportional link assembly 11 may specifically include: a universal joint I 1101, a universal joint II 1102, a universal joint III 1103, a cross plate 1104, a proportional link I 1105, a proportional link II 1106, a proportional link III 1107, a proportional link IV 1108, a proportional link V 1109, a proportional link VI 1110, a proportional link VII 1111 and a proportional link VII 1112. Wherein: universal joint Ⅰ1101, universal joint Ⅱ1102 and universal joint Ⅲ1103 are arranged in parallel and at equal intervals; cross plate 1104 passes through universal joint Ⅰ1101, universal joint Ⅱ1102 and universal joint Ⅲ1103 horizontally, and is respectively hinged with universal joint Ⅰ1101, universal joint Ⅱ1102 and universal joint Ⅲ1103; proportional link Ⅰ1105 and proportional link Ⅱ1106 are hinged and installed on universal joint Ⅰ1101 and universal joint Ⅱ1102; proportional link Ⅲ1107 and proportional link Ⅳ1108 are hinged and installed between universal joint Ⅰ1101 and universal joint Ⅱ1102; proportional link Ⅴ1109 and proportional link Ⅵ1110 are hinged and installed between universal joint Ⅱ1102 and universal joint Ⅲ1103; proportional link Ⅶ1111 and proportional link Ⅶ1112 are hinged and installed between universal joint Ⅱ1102 and universal joint Ⅲ1103.

[0055] In a preferred embodiment of the present invention, Figure 1 The force-bearing universal joint assembly 8 may specifically include: a first guide plate 51 , a second guide plate 52 , a pull plate 6 , a first universal joint pull plate 81 , a second universal joint pull plate 82 , a first cross pin assembly 83 , a hinge plate assembly 84 and a second cross pin assembly 85 .

[0056] Preferably, the first guide plate 51 and the second guide plate 52 are symmetrically arranged on both sides of the center of the tee assembly 4; the first cross pin assembly 83 and the second cross pin assembly 85 are respectively located at the center positions of the second bellows 92 and the third bellows 93; the first guide plate 51 and the second guide plate 52 are welded to the outside of the tee assembly 4 at a set interval.

[0057] Preferably, one end of the pull plate 6 is welded and fixed to the third end plate assembly 73 provided on the upper pipe assembly 2, and the other end is connected to the first cross pin assembly 83 after passing through the first guide plate 51 and the second guide plate 52; one end of the hinge plate assembly 84 is installed on the outer side of the lower pipe assembly 12, and the other end is connected to the second cross pin assembly 85; the first universal joint pull plate 81 and the second universal joint pull plate 82 are arranged in parallel, and the two ends are respectively connected by the first cross pin assembly 83 and the second cross pin assembly 85. Preferably, the first guide plate 51, the second guide plate 52, the pull plate 6 and the hinge plate assembly 84 are on the same axis.

[0058] It should be noted that if Figure 4 There are two groups of force-bearing universal joint assemblies and proportional connecting rod assemblies, which are symmetrically arranged around the high-temperature expansion joint at the outlet of the new flue gas turbine. In addition, the bellows adopts a thin-walled double-layer structure, and is solution treated after forming to eliminate the stress in the welding process of the bellows. The new flue gas turbine outlet high-temperature expansion joint is pre-stretched before leaving the factory, so that the smoke turbine is in a neutral axis position under normal operating conditions, reducing the impact of the bellows stiffness reaction force on the flue gas turbine outlet. Furthermore, the new flue gas turbine outlet high-temperature expansion joint actually measures the expansion joint load before leaving the factory, and adjusts the constant force spring load value according to the actual weighed load to ensure that the smoke turbine outlet force is minimum.

[0059] Example 2

[0060] On the basis of the above-mentioned embodiments, the present invention further reduces the force acting on the flue gas turbine outlet flange through the following process flow, thereby ensuring the normal operation of the flue gas turbine.

[0061] Bellows solution treatment process:

[0062] 1) A shearing machine is used to cut the material to obtain a rough-machined corrugated pipe, and the rough-machined corrugated pipe is processed by a milling machine so that the smoothness of the welding part of the rough-machined corrugated pipe reaches Ra6.3; then, an argon arc welding automatic welding machine is used to weld all longitudinal welds and butt welds. After welding, the weld is subjected to 100% PT inspection to reach Level I specified in NB / T 47013.5-2015.

[0063] 2) Fit the inner and outer bellows cylinders, place the fitted cylinders on the forming tooling, install the fixed end plate and sealing ring, seal the lower end of the bellows, install the hydraulic forming mold on the outside of the cylinder, set fixed pads between each set of molds, and finally install the fixed end plate and sealing ring to seal the upper end of the cylinder. After sealing, place the cylinder on the hydraulic press for hydraulic forming, and after the initial wave bulging, downward pressure, forming, and pressure holding, a reinforced bellows that meets the requirements is formed.

[0064] 3) After the bellows is formed, the straight edge section of the bellows is processed on a lathe so that the flatness and verticality of both ends of the bellows are not greater than 3 mm. After the straight edge section is processed, the port is manually sealed. During the sealing process, three 50mm sections of the upper and lower straight edge sections need to be reserved without sealing.

[0065] 4) Degrease the inner and outer surfaces of the bellows to ensure that there is no oil, impurities or other pollutants on the surface of the bellows.

[0066] 5) Place the bellows and the furnace test plate (the furnace test plate must be made of the same material, batch and wall thickness as the bellows) into the solution treatment furnace for solution treatment. The solution treatment temperature is not less than 1093 degrees Celsius. Keep the temperature for 10 minutes. After the bellows is taken out, the bellows is cooled quickly to room temperature by strong wind. The surface hardness, residual stress, intergranular structure and grain size of the furnace test plate are tested to verify the effect of the solution treatment of the bellows.

[0067] 6) Place the bellows in a drying oven and dry it at 150℃ for 2 hours. Ensure that the moisture inside the bellows is dried, and seal the straight edge sections that are not sealed at both ends. Then pickle and passivate the bellows to reduce the solid solution oxidized parts of the bellows and restore the original metallic color of the material.

[0068] 7) Conduct 100% PT testing on the internal and external welds and internal and external surfaces of the bellows, which must meet Level I specified in NB / T 47013.5-2015.

[0069] Load adjustment process of new flue gas turbine outlet high temperature expansion joint and constant force spring assembly:

[0070] 1) After the processing of the new flue gas turbine outlet high-temperature expansion joint (hereinafter referred to as expansion joint) is completed, all detachable structures on the expansion joint are removed, and temporary marks are made in the circumferential direction of the three bellows, and eight points A, B, C, D, E, F, G, and H are marked on each bellows. Measure the pure wavelength of the above eight points on each group of bellows in the initial state. Measure the length of the expansion joint to determine the initial length.

[0071] 2) Place the expansion joint on the load measuring device so that the expansion joint tee assembly is fixed to the load measuring device and the three bellows can move freely. The port of the lower connecting pipe assembly is parallel to the ground. Record the distance between the port of the lower connecting pipe assembly and the ground.

[0072] 3) Use four 10-ton electronic hook scales to hold the load measurement point. The hook scales must be perpendicular to the fall chain and the fixed point.

[0073] 4) Loosen all transport fixing devices to ensure that the expansion energy saver moves up and down 30mm, that is, the distance between the inner and outer nuts of each transport tie rod that are loosened is not less than 15mm.

[0074] 5) Loosen the fall chain and place it at the lowest point, measure the eight-point pure wavelength marked on each bellows and the height h0 of the end pipe from the ground, and calculate the distance the expansion joint moves downward.

[0075] 6) Apply force to the four measuring points at the same time, and the deviation of each fall chain is less than 50kg, so that the expansion joint returns to the initial position at the same time, and measures the eight-point pure wavelength marked on each bellows and the height of the end pipe from the ground. When the value of the hook scale is static, record the load at each point, which is the load on the constant force spring.

[0076] 7) Adjust the initial load of the constant force spring assembly according to the measured actual load to ensure that the error between the initial load and the actual load is within 1%.

[0077] Expansion joint pre-stretching process:

[0078] 1) The wavelength of the bellows measured after the bellows solution treatment is the length of the bellows in its natural state, and the length is controlled within ±2mm.

[0079] 2) After the expansion joint is assembled, measure the distance from the center line of the tee assembly outlet to the port of the lower connecting pipe assembly, and control the distance to within ±3mm.

[0080] 3) Loosen the transportation fixture of the bellows, wherein the first bellows is compressed by 25mm, the second bellows and the third bellows are stretched by 25mm respectively, and the stretching and compression displacements of the three bellows are controlled within the range of ±1mm. After the adjustment is completed, fix the transportation fixture so that the distance from the outlet center line of the tee assembly to the port of the lower connecting pipe assembly increases by 25mm.

[0081] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0082] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. A new type of high-temperature expansion joint for flue gas turbine outlet, characterized in that: include: A sealing head (1), an upper pipe assembly (2), a first guide tube (31), a second guide tube (32), a third guide tube (33), a three-way assembly (4), a force-bearing universal joint assembly (8), a first bellows (91), a second bellows (92), a third bellows (93), an intermediate pipe assembly (10), a proportional connecting rod assembly (11), a lower pipe assembly (12), a constant force spring assembly (13), a flue gas turbine frame (14) and a tie rod assembly (15); The end cap (1) is welded to the upper pipe assembly (2) to achieve sealing; the upper pipe assembly (2), the first bellows (91), the tee assembly (4), the second bellows (92), the middle pipe assembly (10), the third bellows (93) and the lower pipe assembly (12) are connected in sequence; the proportional connecting rod assembly (11) is installed on the outside of the high-temperature expansion joint at the outlet of the novel flue gas turbine, and is located between the end of the tee assembly (4) close to the second bellows (92) and the lower pipe assembly (12); the end of the tee assembly (4) close to the second bellows (92) is provided with a first end plate assembly (71), the outer surface of the middle pipe assembly (10) is provided with a universal ring (18), the end of the lower pipe assembly (12) close to the third bellows (93) is provided with a second end plate assembly (72), and the proportional connecting rod assembly (11) is provided with a plurality of connecting rods. ) is installed and fixed by a first end plate assembly (71), a universal ring (18) and a second end plate assembly (72); the first guide tube (31) is welded and fixed to one end of the three-way assembly (4) close to the first bellows (91); the second guide tube (32) is welded and fixed to one end of the middle pipe assembly (10) close to the second bellows (92); the third guide tube (33) is welded and fixed to one end of the lower pipe assembly (12) close to the third bellows (93); the force universal joint assembly (8) is arranged between the upper pipe assembly (2) and the lower pipe assembly (12) to absorb the pressure thrust generated by the internal pressure of the bellows; one end of the pull rod assembly (15) is connected through a fourth end plate assembly (74) arranged on the lower pipe assembly (12), and the other end is connected to the constant force spring assembly (13) through the flue gas turbine frame (14); A proportional link assembly (11) comprises: a universal joint I (1101), a universal joint II (1102), a universal joint III (1103), a cross plate (1104), a proportional link I (1105), a proportional link II (1106), a proportional link III (1107), a proportional link IV (1108), a proportional link V (1109), a proportional link VI (1110), a proportional link VII (1111) and a proportional link VII (1112); wherein the universal joint I (1101), the universal joint II (1102) and the universal joint III (1103) are arranged in parallel and at equal intervals; the cross plate (1104) passes through the universal joint I (1101), the universal joint II (1102) and the universal joint III (1103) in a transverse direction and is respectively connected to the universal joints I (1101), II (1102) and III (1103) Universal joint I (1101), universal joint II (1102) and universal joint III (1103) are hinged; proportional link I (1105) and proportional link II (1106) are hinged and installed between universal joint I (1101) and universal joint II (1102); proportional link III (1107) and proportional link IV (1108) are hinged and installed between universal joint I (1101) and universal joint II (1102); proportional link V (1109) and proportional link VI (1110) are hinged and installed between universal joint II (1102) and universal joint III (1103); proportional link VII (1111) and proportional link VII (1112) are hinged and installed between universal joint II (1102) and universal joint III (1103); In practical applications, appropriate constant force spring assemblies are selected according to the actual load of the expansion joint to absorb the load generated by the expansion joint, and the traditional double-hanging point constant force spring is replaced with a seat-type constant force spring assembly, which is placed on the flue gas turbine frame; there are two groups of force-bearing universal joint assemblies and proportional connecting rod assemblies, which are symmetrically arranged around the expansion joint; the expansion joint is pre-stretched before leaving the factory, so that the smoke turbine is in the neutral axis position under normal operating conditions, reducing the influence of the bellows stiffness reaction force on the smoke turbine outlet; the expansion joint load is actually measured before leaving the factory, and the constant force spring load value is adjusted according to the actual weighed load to ensure that the smoke turbine outlet force is minimized.

2. The novel flue gas turbine outlet high temperature expansion joint according to claim 1 is characterized in that: Also includes: A first protective cover (161), a second protective cover (162) and a third protective cover (163); The first protective cover (161), the second protective cover (162) and the third protective cover (163) are respectively arranged on the outside of the first bellows (91), the second bellows (92) and the third bellows (93) to protect the bellows during transportation and installation; The two ends of the first protective cover (161) are respectively welded and fixed to the upper pipe assembly (2) and the three-way assembly (4); the two ends of the second protective cover (162) are respectively welded and fixed to the three-way assembly (4) and the middle pipe assembly (10); and the two ends of the third bellows (93) are respectively welded and fixed to the middle pipe assembly (10) and the lower pipe assembly (12).

3. The novel flue gas turbine outlet high temperature expansion joint according to claim 1 is characterized in that: A force-bearing universal joint assembly (8), comprising: a first guide plate (51), a second guide plate (52), a pull plate (6), a first universal joint pull plate (81), a second universal joint pull plate (82), a first cross pin assembly (83), a hinge plate assembly (84) and a second cross pin assembly (85); wherein the first guide plate (51) and the second guide plate (52) are symmetrically arranged on both sides of the center of the three-way assembly (4); the first cross pin assembly (83) and the second cross pin assembly (85) are respectively located at the center of the second bellows (92) and the third bellows (93); the first guide plate (51) and the second guide plate (52) are welded to the outside of the three-way assembly (4) at a set interval; One end of the pull plate (6) is welded and fixed to a third end plate assembly (73) arranged on the upper pipe assembly (2), and the other end passes through the first guide plate (51) and the second guide plate (52) and is connected to the first cross pin assembly (83); one end of the hinge plate assembly (84) is installed on the outside of the lower pipe assembly (12), and the other end is connected to the second cross pin assembly (85); The first universal joint pull plate (81) and the second universal joint pull plate (82) are arranged in parallel, and the two ends are connected by a first cross pin assembly (83) and a second cross pin assembly (85) respectively.

4. The novel flue gas turbine outlet high temperature expansion joint according to claim 3 is characterized in that: The first guide plate (51), the second guide plate (52), the pull plate (6) and the hinge plate assembly (84) are located on the same axis.

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