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

Abstract

The invention discloses a novel hinge expansion joint for high-temperature flue of flue gas turbine, comprising: end pipe I, end pipe II, bellows, load-bearing frame I, load-bearing frame II, two sets of hinge mechanisms and eight sets of supporting components; end pipe I, bellows and end pipe II are connected in sequence; load-bearing frame I is located at the side of end pipe I and supports end pipe I through four sets of supporting components; load-bearing frame II is located at the side of end pipe II and supports end pipe II through another four sets of supporting components; two sets of hinge mechanisms are installed between load-bearing frame I and load-bearing frame II. The invention ensures the long-term operation of the expansion joint under high-temperature working conditions and improves the service life of the product.

Description

Technical Field

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

[0002] The energy recovery system of the catalytic cracking unit is a key device in the oil refining system. The energy recovery system uses the flue gas of the catalytic cracking unit, the flue gas temperature and pressure energy to drive the flue gas fan, and the flue gas pressure and temperature energy to generate power, drive the main fan to do work, or drive the generator to generate electricity, so as to fully recover the energy of the regenerated flue gas. The inlet pipeline of the flue gas fan is a hot wall structure with no insulation material inside. Its working pressure is relatively high, generally 0.2~0.38MPa. In recent years, in order to improve the energy efficiency of the flue gas fan, various catalytic cracking units have generally increased the medium temperature at the inlet of the flue gas fan, and its working temperature has reached 700~750℃.

[0003] In order to meet the displacement requirements and the stress requirements of the smoke exhauster, several single hinge expansion joints or universal hinge expansion joints are generally set on the smoke exhauster inlet pipeline. In order to restrain the pressure thrust of the bellows, when setting the single hinge expansion joint or universal hinge expansion joint, a stress-bearing structure (austenitic stainless steel materials such as 304, 304H or 316H, etc.) is usually set outside the pipeline and connected to the pipeline by welding. However, as mentioned above, the operating temperature of the smoke exhauster inlet reaches 700-750℃, which causes the stress-bearing structure to be within the creep temperature range. During operation, the welds of the stress-bearing structure often crack, which seriously affects the normal operation of the equipment. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art and to provide a novel hinge expansion joint for a high-temperature flue of a flue gas turbine, thereby ensuring the long-term operation of the expansion joint under high-temperature conditions and improving the service life of the product.

[0005] In order to solve the above technical problems, the present invention discloses a novel hinge expansion joint for a high-temperature flue of a flue gas turbine, comprising: an end pipe I, an end pipe II, a bellows, a load-bearing frame I, a load-bearing frame II, two sets of hinge mechanisms and eight sets of support components;

[0006] End pipe Ⅰ, bellows and end pipe Ⅱ are connected in sequence;

[0007] The load-bearing frame I is located on the side of the end pipe I and supports the end pipe I through four sets of supporting components;

[0008] The load-bearing frame II is located on the side of the end pipe II and supports the end pipe II through another four sets of support components;

[0009] Two sets of hinge mechanisms are installed between the load-bearing frame I and the load-bearing frame II.

[0010] In the above-mentioned new hinge expansion joint for high-temperature flue of flue gas turbine, the structures of bearing frame I and bearing frame II are the same;

[0011] The load-bearing frame I comprises: a load-bearing plate I, a load-bearing plate II, a load-bearing steel pipe I and a load-bearing steel pipe II; wherein the load-bearing plate I is arranged in parallel with the load-bearing plate II, and the upper and lower ends of the load-bearing plate I and the load-bearing plate II are connected and fixed respectively by the load-bearing steel pipe I and the load-bearing steel pipe II;

[0012] The load-bearing frame II includes: a load-bearing plate III, a load-bearing plate IV, a load-bearing steel pipe III and a load-bearing steel pipe IV; wherein, the load-bearing plate III is arranged in parallel with the load-bearing plate IV, and the upper and lower ends of the load-bearing plate III and the load-bearing plate IV are connected and fixed respectively by the load-bearing steel pipe III and the load-bearing steel pipe IV.

[0013] In the above-mentioned new hinge expansion joint for high-temperature flue of flue gas turbine, two sets of hinge mechanisms are: hinge mechanism I and hinge mechanism II;

[0014] Hinge mechanism I, comprising: pin shaft I, hinge connecting plate I, hinge plate I and hinge plate II; wherein one end of hinge plate I is hinged to one end of hinge plate II through the hinge connecting plate and pin shaft I, the other end of hinge plate I passes through the square groove on load-bearing steel pipe I and is welded to load-bearing steel pipe I, and the other end of hinge plate II passes through the square groove on load-bearing steel pipe III and is welded to load-bearing steel pipe III;

[0015] The hinge mechanism II comprises: a pin shaft II, a hinge connecting plate II, a hinge plate III and a hinge plate IV; wherein one end of the hinge plate III is hinged to one end of the hinge plate IV through the hinge connecting plate II and the pin shaft II, the other end of the hinge plate III passes through the square groove on the load-bearing steel pipe II and is welded to the load-bearing steel pipe II, and the other end of the hinge plate IV passes through the square groove on the load-bearing steel pipe IV and is welded to the load-bearing steel pipe IV.

[0016] In the above-mentioned new hinge expansion joint for high-temperature flue of flue gas turbine, the eight groups of supporting components have the same structure; wherein, the eight groups of supporting components are installed in pairs through load-bearing steel pipe I, load-bearing steel pipe II, load-bearing steel pipe III and load-bearing steel pipe IV respectively.

[0017] In the above-mentioned new hinge expansion joint for high-temperature flue of flue gas turbine, the support assembly includes: a vertical plate, a connecting plate, a transverse limit block, a longitudinal limit block and an L-shaped limit block;

[0018] The bottom surfaces of the transverse limit block, longitudinal limit block and L-shaped limit block are welded and fixed to the outer side of the end pipe, and the whole is subjected to solid solution treatment to completely eliminate welding stress;

[0019] The connection plate is limited by a transverse limit block, a longitudinal limit block and an L-shaped limit block welded on the end tube and is arranged outside the end tube; wherein the lower surface of the connection plate is in contact with the end tube but is not welded;

[0020] The bottom of the vertical plate is welded and fixed to the upper surface of the connecting plate;

[0021] A circular hole is arranged on the upper part of the vertical plate, and the vertical plate is installed on the load-bearing steel pipe through the circular hole and is welded and fixed to the load-bearing steel pipe.

[0022] In the above-mentioned new hinge expansion joint for high-temperature flue of flue gas turbine, exhaust holes are arranged on the transverse limit block, the longitudinal limit block and the L-shaped limit block to avoid gas retention inside during welding.

[0023] In the above-mentioned new hinge expansion joint for high-temperature flue of flue gas turbine, the L-shaped limit block includes: limit block I and limit block II;

[0024] Limit block I and limit block II are welded vertically;

[0025] The bottom surface of the limit block I is welded and fixed to the outer side of the end pipe;

[0026] The side surface of the limit block II contacts the vertical plate to limit the lateral displacement of the vertical plate.

[0027] In the above-mentioned new hinge expansion joint for high-temperature flue of flue gas turbine, the number of transverse limit blocks is 3, the number of longitudinal limit blocks is 4, and the number of L-shaped limit blocks is one;

[0028] Three lateral limit blocks and one L-shaped limit block are respectively located on two opposite sides of the connecting plate;

[0029] The four longitudinal limit blocks are grouped in pairs and are respectively located on the other two opposite sides of the connecting plate.

[0030] The present invention has the following advantages:

[0031] (1) The present invention discloses a novel hinge expansion joint for a high-temperature flue of a flue gas turbine, which changes the traditional connection method of "welding and fixing the vertical plate and the end pipe" to a mechanical connection through a support assembly, and changes the welding type to a floating type, thereby completely eliminating the thermal stress problem between the structural member and the end pipe due to welding, thereby ensuring the long-term operation of the expansion joint under high-temperature conditions and improving the service life of the product.

[0032] (2) The present invention discloses a novel hinge expansion joint for a high-temperature flue of a flue gas turbine. The two sets of hinge mechanisms can effectively absorb angular displacement and meet product use requirements.

[0033] (3) The present invention discloses a novel hinge expansion joint for a high-temperature flue of a flue gas turbine, in which only a limit block and an end pipe are welded, and the welding amount is small, which can fully reduce welding stress and welding deformation, and avoid the problem of structural parts cracking caused by deformation and thermal stress during the welding process; at the same time, after the end pipe and the limit block are welded, it is convenient to carry out post-weld heat treatment, thereby further reducing the thermal stress at the welding position and avoiding cracking and damage of the weld; in addition, the welding parts of the limit block and the end pipe are also convenient for on-site external insulation, which can avoid deformation and welding stress caused by too large temperature difference when the welding parts are working.

[0034] (4) The present invention discloses a novel hinge expansion joint for a high-temperature flue of a flue gas turbine, which reduces the width and thickness of the structural parts, facilitates product processing and manufacturing, and greatly reduces product costs. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0036] Figure 2 It is a partial diagram of a new type of hinge expansion joint for a high-temperature flue of a flue gas turbine according to an embodiment of the present invention;

[0037] Figure 3 It is a framework diagram of a novel hinge expansion joint for a high-temperature flue of a flue gas turbine in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] 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.

[0039] like Figure 1 In this embodiment, the new hinge expansion joint for high-temperature flue of flue gas turbine includes: end pipe Ⅰ1, end pipe Ⅱ2, bellows 3, load-bearing frame Ⅰ6, load-bearing frame Ⅱ7, two sets of hinge mechanisms and eight sets of support components.

[0040] The specific connection relationship is as follows: the end tube Ⅰ1, the corrugated pipe 3 and the end tube Ⅱ2 are connected in sequence; the load-bearing frame Ⅰ6 is located on the side of the end tube Ⅰ1, and supports the end tube Ⅰ1 through four groups of support components; the load-bearing frame Ⅱ7 is located on the side of the end tube Ⅱ2, and supports the end tube Ⅱ2 through another four groups of support components; two groups of hinge mechanisms are installed between the load-bearing frame Ⅰ6 and the load-bearing frame Ⅱ7.

[0041] In this embodiment, the structures of the load-bearing frame I6 and the load-bearing frame II7 are the same.

[0042] Preferably, Figure 1The bearing frame Ⅰ6 may specifically include: bearing plate Ⅰ61, bearing plate Ⅱ62, bearing steel pipe Ⅰ63 and bearing steel pipe Ⅱ64. Among them, the bearing plate Ⅰ61 is arranged in parallel with the bearing plate Ⅱ62, and the upper and lower ends of the bearing plate Ⅰ61 and the bearing plate Ⅱ62 are connected and fixed by the bearing steel pipe Ⅰ63 and the bearing steel pipe Ⅱ64 respectively.

[0043] Preferably, Figure 1 The bearing frame II7 may specifically include: bearing plate III71, bearing plate IV72, bearing steel pipe III73 and bearing steel pipe IV74. The bearing plate III71 is arranged in parallel with the bearing plate IV72, and the upper and lower ends of the bearing plate III71 and the bearing plate IV72 are connected and fixed by the bearing steel pipe III73 and the bearing steel pipe IV74 respectively.

[0044] In this embodiment, the two sets of hinge mechanisms are: hinge mechanism I 4 and hinge mechanism II 5. The hinge mechanism I 4 and hinge mechanism II 5 have the same structure.

[0045] Preferably, Figure 1 The hinge mechanism I4 may specifically include: a pin shaft I41, a hinge connecting plate I42, a hinge plate I43 and a hinge plate II44. Among them, one end of the hinge plate I43 is hinged to one end of the hinge plate II44 through the hinge connecting plate 42 and the pin shaft I41, the other end of the hinge plate I43 passes through the square groove on the bearing steel pipe I63 and is welded to the bearing steel pipe I63, and the other end of the hinge plate II44 passes through the square groove on the bearing steel pipe III73 and is welded to the bearing steel pipe III73.

[0046] Preferably, Figure 2 The hinge mechanism II5 may specifically include: a pin II51, a hinge connecting plate II52, a hinge plate III53 and a hinge plate IV54. One end of the hinge plate III53 is hinged to one end of the hinge plate IV54 through the hinge connecting plate II52 and the pin II51, the other end of the hinge plate III53 passes through the square groove on the bearing steel pipe II64 and is welded to the bearing steel pipe II64, and the other end of the hinge plate IV54 passes through the square groove on the bearing steel pipe IV74 and is welded to the bearing steel pipe IV74.

[0047] In this embodiment, if Figure 1 The eight groups of supporting components have the same structure. Among them, the eight groups of supporting components are installed in pairs through the bearing steel pipe Ⅰ63, the bearing steel pipe Ⅱ64, the bearing steel pipe Ⅲ73 and the bearing steel pipe Ⅳ74 respectively.

[0048] Preferably, any group of support components is taken as an example to illustrate the structure of the support component. Figure 3The support assembly includes: a vertical plate 8, a connecting plate 9, a transverse limit block 10, a longitudinal limit block 11 and an L-shaped limit block 12. Among them: the bottom surfaces of the transverse limit block 10, the longitudinal limit block 11 and the L-shaped limit block 12 are welded and fixed to the outer side of the end pipe, and the whole is subjected to solid solution treatment to completely eliminate welding stress; the connecting plate 9 is limited by the transverse limit block 10, the longitudinal limit block 11 and the L-shaped limit block 12 welded on the end pipe and is set on the outer side of the end pipe; the bottom of the vertical plate 8 is welded and fixed to the upper surface of the connecting plate 9; the upper part of the vertical plate 8 is provided with a circular hole, and the vertical plate 8 is installed on the load-bearing steel pipe through the circular hole and is welded and fixed to the load-bearing steel pipe.

[0049] It can be seen that the connecting plate 9 is not welded to the end tube, the transverse limit block 10, the longitudinal limit block 11 and the L-shaped limit block 12, and is only limited by the transverse limit block 10, the longitudinal limit block 11 and the L-shaped limit block 12. The lower surface of the connecting plate 9 is in contact with the end tube but not welded, so that a floating structure is formed between the connecting plate 9 and the end tube. Since there is no welding, there will be no problem of weld cracking and damage.

[0050] Furthermore, there are three transverse limit blocks 10, four longitudinal limit blocks 11, and one L-shaped limit block 12. The three transverse limit blocks 10 and one L-shaped limit block 12 are respectively located on two opposite sides of the connecting plate 9; the four longitudinal limit blocks 11 are grouped in pairs and are respectively located on the other two opposite sides of the connecting plate 9.

[0051] Furthermore, exhaust holes are provided on the transverse limit block 10, the longitudinal limit block 11 and the L-shaped limit block 12 to prevent gas from being retained inside during the welding process.

[0052] Further, such as Figure 3 The L-shaped limit block 12 includes a limit block I 121 and a limit block II 122. The limit block I 121 and the limit block II 122 are vertically welded; the bottom surface of the limit block I 121 is welded and fixed to the outer side of the end pipe; the side surface of the limit block II 122 contacts the vertical plate 8 to limit the lateral displacement of the vertical plate 8.

[0053] 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.

[0054] 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 hinge expansion joint for high temperature flue of flue gas turbine, characterized in that: include: End pipe I (1), end pipe II (2), bellows (3), load-bearing frame I (6), load-bearing frame II (7), two sets of hinge mechanisms and eight sets of support components; The end pipe I (1), the corrugated pipe (3) and the end pipe II (2) are connected in sequence; the load-bearing frame I (6) is located on the side of the end pipe I (1) and supports the end pipe I (1) through four groups of support components; the load-bearing frame II (7) is located on the side of the end pipe II (2) and supports the end pipe II (2) through another four groups of support components; two groups of hinge mechanisms are installed between the load-bearing frame I (6) and the load-bearing frame II (7); The bearing frame I (6) and the bearing frame II (7) have the same structure; the bearing frame I (6) comprises: a bearing plate I (61), a bearing plate II (62), a bearing steel pipe I (63) and a bearing steel pipe II (64); wherein the bearing plate I (61) is arranged in parallel with the bearing plate II (62), and the upper and lower ends of the bearing plate I (61) and the bearing plate II (62) are connected and fixed respectively by the bearing steel pipe I (63) and the bearing steel pipe II (64); the bearing frame II (7) comprises: a bearing plate III (71), a bearing plate IV (72), a bearing steel pipe III (73) and a bearing steel pipe IV (74); wherein the bearing plate III (71) is arranged in parallel with the bearing plate IV (72), and the upper and lower ends of the bearing plate III (71) and the bearing plate IV (72) are connected and fixed respectively by the bearing steel pipe III (73) and the bearing steel pipe IV (74); The two sets of hinge mechanisms are hinge mechanism I (4) and hinge mechanism II (5); hinge mechanism I (4) comprises: pin shaft I (41), hinge connecting plate I (42), hinge plate I (43) and hinge plate II (44); wherein one end of hinge plate I (43) is hinged to one end of hinge plate II (44) through hinge connecting plate I (42) and pin shaft I (41); the other end of hinge plate I (43) passes through a square groove on load-bearing steel pipe I (63) and is welded to load-bearing steel pipe I (63); the other end of hinge plate II (44) passes through a square groove on load-bearing steel pipe III (73) and welded to the load-bearing steel pipe III (73); a hinge mechanism II (5), comprising: a pin shaft II (51), a hinge connecting plate II (52), a hinge plate III (53) and a hinge plate IV (54); wherein one end of the hinge plate III (53) is hingedly connected to one end of the hinge plate IV (54) through the hinge connecting plate II (52) and the pin shaft II (51); the other end of the hinge plate III (53) passes through the square groove on the load-bearing steel pipe II (64) and is welded to the load-bearing steel pipe II (64); and the other end of the hinge plate IV (54) passes through the square groove on the load-bearing steel pipe IV (74) and is welded to the load-bearing steel pipe IV (74); A support assembly comprises: a vertical plate (8), a connecting plate (9), a transverse limit block (10), a longitudinal limit block (11) and an L-shaped limit block (12); wherein the bottom surfaces of the transverse limit block (10), the longitudinal limit block (11) and the L-shaped limit block (12) are welded and fixed to the outer side of the end pipe, and the whole is subjected to solid solution treatment so as to completely eliminate welding stress; the connecting plate (9) is limited by the transverse limit block (10), the longitudinal limit block (11) and the L-shaped limit block (12) welded on the end pipe and is arranged on the outer side of the end pipe; wherein the lower surface of the connecting plate (9) is in contact with the end pipe but is not welded; the bottom of the vertical plate (8) is welded and fixed to the upper surface of the connecting plate (9); a circular hole is arranged on the upper part of the vertical plate (8), and the vertical plate (8) is installed on the load-bearing steel pipe through the circular hole and is welded and fixed to the load-bearing steel pipe.

2. The new hinge expansion joint for high-temperature flue of a flue gas turbine according to claim 1 is characterized in that: The eight groups of support components have the same structure; wherein the eight groups of support components are installed in pairs, respectively through the load-bearing steel pipe I (63), the load-bearing steel pipe II (64), the load-bearing steel pipe III (73) and the load-bearing steel pipe IV (74).

3. The new hinge expansion joint for high-temperature flue of a flue gas turbine according to claim 1 is characterized in that: The transverse limit block (10), the longitudinal limit block (11) and the L-shaped limit block (12) are all provided with exhaust holes to prevent gas from being retained inside during the welding process.

4. The new hinge expansion joint for high-temperature flue of a flue gas turbine according to claim 1 is characterized in that: The L-shaped limit block (12) comprises a limit block I (121) and a limit block II (122); The limit block I (121) and the limit block II (122) are vertically welded; The bottom surface of the limit block I (121) is welded and fixed to the outer side of the end pipe; The side surface of the limiting block II (122) contacts the vertical plate (8) to limit the lateral displacement of the vertical plate (8).

5. The new hinge expansion joint for high-temperature flue of a flue gas turbine according to claim 1 is characterized in that: The number of transverse limit blocks (10) is 3, the number of longitudinal limit blocks (11) is 4, and the number of L-shaped limit blocks (12) is one; Three lateral limit blocks (10) and an L-shaped limit block (12) are respectively located on two opposite sides of the connecting plate (9); The four longitudinal limit blocks (11) are grouped in pairs and are respectively located on the other two opposite side surfaces of the connecting plate (9).

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