Exhaust chimney for gas turbine and gas turbine unit with same
By installing the exhaust smoke pipe in the external smoke pipe bracket and bearing the weight of the exhaust sound silence device through the support frame, the problems of complex structure, large weight and high cost of the exhaust chimney of the existing gas turbine are solved, and the effects of simplification of structure, weight reduction and service life are achieved.
Patent Information
- Application Number
- CN202421723944.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-19
AI Technical Summary
The exhaust chimney of existing gas turbines has complex structure, large overall weight, high production costs, and is prone to thermal stress and thermal fatigue problems, which affects service life.
An exhaust chimney for gas turbines is designed. By placing the exhaust smoke pipe in the external smoke pipe bracket, the smoke pipe bracket bears the weight of the exhaust smoke pipe, simplifies the smoke pipe structure, facilitates the insulation design, and bears the weight of the exhaust sound silence device through the support frame, reducing the overall weight of the chimney.
It effectively simplifies the smoke pipe structure, reduces the weight and production cost of the chimney, reduces the risk of thermal stress and thermal fatigue, and extends the service life.
Smart Images
Figure CN222772284U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas turbine exhaust, in particular to an exhaust chimney for a gas turbine. In addition, the utility model also relates to a gas turbine unit with an exhaust chimney for a gas turbine. Background Art
[0002] The gas turbine exhaust chimney is the passage for the gas turbine exhaust to the atmosphere. In order to avoid the harmful gases in the exhaust from having an adverse effect on the surrounding environment, the chimney needs to be designed to be very high. Tall chimneys bring many structural problems and need to meet the structural load-bearing and stability requirements in both cold and hot states.
[0003] Conventional chimneys are mostly one-piece steel cylinder structures, with the chimney itself bearing all its weight. When heated, the chimney can expand upward freely. The existing exhaust chimney has the following problems:
[0004] 1. Since the chimney needs to bear the static load of the entire chimney and external dynamic loads (such as typhoons, earthquakes, etc.) by its own structure and has to have sufficient stability, a skeleton and reinforcement ribs need to be set inside the chimney. The higher the chimney is, the greater its own weight is, and the more reinforcement is needed. In turn, the reinforcement structure further increases the weight of the chimney. Therefore, the chimney as a whole is very thick and heavy;
[0005] 2. When the exhaust chimney is deformed by heat, there is a temperature difference between the skeleton structure inside the exhaust chimney and the inner and outer wall panels, which is easy to produce thermal stress. Long-term repeated changes in temperature will cause thermal fatigue of the structure, which is easy to cause structural cracks, air leakage, heat leakage and other problems, affecting the service life of the chimney;
[0006] 3. The internal skeleton structure of the chimney is not conducive to the design of the thermal insulation structure, and the temperature of the outer wall is difficult to drop below 60°C. An additional thermal insulation layer is required, which increases the complexity of the internal structure of the chimney;
[0007] 4. The material of the internal frame of the chimney needs to be high temperature resistant, which has high production costs. Utility Model Content
[0008] The utility model provides an exhaust chimney for a gas turbine and a gas turbine unit having the same, so as to solve the technical problems of the existing exhaust chimney having a complex internal structure, a large overall weight and a high production cost.
[0009] The technical solution adopted by the utility model is as follows:
[0010] An exhaust chimney for a gas turbine comprises: an exhaust silencer for treating exhaust gas, a support base frame and a smoke pipe bracket for mounting and supporting, an exhaust smoke pipe for guiding exhaust gas upward, and a support assembly for supporting and connecting; the support base frame is supported on the ground, the exhaust silencer is vertically supported in the support base frame, and its air inlet end is used to be connected to the exhaust port of the gas turbine; the smoke pipe bracket is vertically supported on the top of the support base frame, the exhaust smoke pipe is vertically supported in the smoke pipe bracket through the support assembly, and the bottom end of the exhaust smoke pipe is connected to the top of the exhaust silencer.
[0011] Furthermore, the exhaust silencer device includes an exhaust silencer vertically supported in a supporting frame, and an exhaust elbow vertically connected to the side wall of the bottom end of the exhaust silencer; the bottom end of the exhaust smoke pipe is axially detachably fixed to the top end of the exhaust silencer; the exhaust elbow is used to be connected to the exhaust port of the gas turbine through a soft connection arranged at its air inlet end.
[0012] Furthermore, the exhaust smoke pipe includes a bottom exhaust straight pipe, one or more sections of intermediate exhaust straight pipes, and a top exhaust straight pipe, which are arranged in sequence along the axial direction and connected end to end; the bottom end of the bottom exhaust straight pipe is detachably fixed to the top end of the exhaust silencer; the bottom exhaust straight pipe, one or more sections of intermediate exhaust straight pipes, and the top exhaust straight pipe are also supported on the smoke pipe bracket at the corresponding position through the support assembly.
[0013] Furthermore, the bottom exhaust straight pipe and the middle exhaust straight pipe both include a straight pipe section, and a plug-in section that is transitionally connected to the top end of the straight pipe section and has an outer diameter smaller than the outer diameter of the straight pipe section; the bottom exhaust straight pipe and the middle exhaust straight pipe, the adjacent middle exhaust straight pipes, and the middle exhaust straight pipe and the top exhaust straight pipe are respectively plug-connected through the plug-in section, and there is also an axial gap at the plug-in connection between the two.
[0014] Furthermore, the support assembly includes a plurality of groups of sliding supports arranged in sequence along the circumference of the bottom exhaust straight pipe, a plurality of groups of first fixed supports arranged in sequence along the circumference of the middle exhaust straight pipe, a plurality of groups of inclined plane centering supports and a plurality of groups of second fixed supports arranged in sequence along the circumference of the upper and lower ends of the top exhaust straight pipe; the sliding support is connected between the bottom exhaust straight pipe and the smoke pipe bracket to enable the bottom exhaust straight pipe to be radially slidingly supported on the smoke pipe bracket; the first fixed support is connected between the middle exhaust straight pipe and the smoke pipe bracket to enable the middle exhaust straight pipe to be radially slightly moved and supported on the smoke pipe bracket; the second fixed support is connected between the top exhaust straight pipe and the smoke pipe bracket to enable the top exhaust straight pipe to be radially slightly moved and supported on the smoke pipe bracket; the inclined plane centering support is connected between the top exhaust straight pipe and the smoke pipe bracket to enable the top exhaust straight pipe to be automatically centeringly supported on the smoke pipe bracket.
[0015] Furthermore, the sliding support includes a connecting seat fixed on the outer circle of the bottom exhaust straight pipe, two mounting seats correspondingly fixed on the smoke pipe bracket and arranged relatively at intervals, and limiting bolts installed on each mounting seat; the connecting seat is supported on the smoke pipe bracket between the two corresponding groups of mounting seats, and the two groups of limiting bolts are respectively limited against the two sides of the connecting seat.
[0016] Furthermore, the first fixed support and the second fixed support have the same structure. The first fixed support includes a fixed support fixed on the outer circle of the middle exhaust straight pipe and a connecting bolt that plays a connecting role. The fixed support is supported on the smoke pipe bracket and is provided with a long strip hole that penetrates the plate surface and extends radially in the shape of a strip. The connecting bolt is connected to the smoke pipe bracket and penetrates into the corresponding long strip hole; the inclined plane centering support includes an upper wedge block support fixed on the outer circle of the top exhaust straight pipe and a lower wedge block support correspondingly fixed on the smoke pipe bracket. The upper wedge block support and the corresponding lower wedge block support are abutted, and the contact point between the two is respectively provided with a centering inclined plane that extends downward from the outside to the center along the radial direction.
[0017] Furthermore, a heat insulation layer is provided on the inner circumferential surface of the exhaust smoke pipe.
[0018] Furthermore, the smoke pipe bracket is arranged in multiple sections along the axial direction, and two adjacent sections of the smoke pipe bracket are detachably fixed.
[0019] According to another aspect of the utility model, a gas turbine unit is provided, comprising a gas turbine and an exhaust chimney for the gas turbine as described above; the air inlet end of the exhaust chimney for the gas turbine is connected to the exhaust port of the gas turbine.
[0020] The utility model has the following beneficial effects:
[0021] In the exhaust chimney for a gas turbine of the utility model, the exhaust smoke pipe is arranged in an external smoke pipe bracket, the weight of the exhaust smoke pipe is borne by the smoke pipe bracket, and the exhaust smoke pipe only needs to meet the smoke exhaust and heat insulation requirements, thereby effectively simplifying the structure of the smoke pipe, facilitating the design of its internal insulation structure, and reducing the weight of the chimney; since the smoke pipe bracket works at normal temperature, it has low requirements on materials, and ordinary carbon steel materials can be selected, thereby effectively reducing the production cost, and the smoke pipe bracket also acts as a protective barrier, which can effectively prevent personnel from contacting the hot surface of the exhaust smoke pipe to prevent burns, so the heat insulation inside the exhaust smoke pipe can be simplified or even cancelled, thereby further reducing the weight; in addition, the weight of the exhaust silencer is also completely borne by the supporting chassis, thereby further reducing the weight of the chimney and meeting the requirements for limiting the weight of the exhaust chimney under specific conditions.
[0022] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:
[0024] Figure 1 This is a schematic diagram of the spatial structure of an exhaust chimney for a gas turbine according to a preferred embodiment of the utility model;
[0025] Figure 2 yes Figure 1 A side view schematic diagram of the structure;
[0026] Figure 3 yes Figure 1 A schematic diagram of the main structure of the central exhaust smoke pipe;
[0027] Figure 4 yes Figure 3 A schematic diagram of a partial cross-sectional structure;
[0028] Figure 5 yes Figure 3 Structural schematic diagram of the center slope centering support;
[0029] Figure 6 yes Figure 3 A schematic diagram of the structure of the first fixed support;
[0030] Figure 7 yes Figure 6 A schematic diagram of a top view structure;
[0031] Figure 8 yes Figure 3 Schematic diagram of the structure of the sliding bearing.
[0032] Legend:
[0033] 10. Exhaust silencer; 11. Exhaust silencer; 12. Exhaust elbow; 121. Flexible connection; 20. Support frame; 30. Smoke pipe bracket; 40. Exhaust smoke pipe; 41. Bottom exhaust straight pipe; 42. Middle exhaust straight pipe; 43. Top exhaust straight pipe; 50. Support assembly; 51. Sliding support; 511. Connecting seat; 512. Mounting seat; 513. Limiting bolt; 52. First fixed support; 521. Fixed seat; 5211. Long strip hole; 522. Connecting bolt; 53. Inclined centering support; 530. Centering inclined plane; 531. Upper wedge support; 532. Lower wedge support; 54. Second fixed support. DETAILED DESCRIPTION
[0034] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.
[0035] Reference Figure 1-2 The preferred embodiment of the utility model provides an exhaust chimney for a gas turbine, comprising: an exhaust silencer 10 for treating exhaust gas, a support frame 20 and a smoke pipe bracket 30 for mounting and supporting, an exhaust smoke pipe 40 for guiding the exhaust gas upward, and a support assembly 50 for supporting and connecting. The support frame 20 is supported on the ground, the exhaust silencer 10 is vertically supported in the support frame 20, and its air inlet end is used to be connected to the exhaust port of the gas turbine. The smoke pipe bracket 30 is vertically supported at the top of the support frame 20, the exhaust smoke pipe 40 is vertically supported in the smoke pipe bracket 30 through the support assembly 50, and the bottom end of the exhaust smoke pipe 40 is connected to the top of the exhaust silencer 10.
[0036] In the exhaust chimney for a gas turbine of the present invention, an exhaust smoke pipe 40 is arranged in an external smoke pipe bracket 30, and the weight of the exhaust smoke pipe 40 is borne by the smoke pipe bracket 30. The exhaust smoke pipe 40 only needs to meet the smoke exhaust and heat insulation requirements, thereby effectively simplifying the structure of the smoke pipe, facilitating the design of its internal insulation structure, and reducing the weight of the chimney; since the smoke pipe bracket 30 works at room temperature, it has low requirements on materials, and ordinary carbon steel materials can be selected, thereby effectively reducing the production cost, and the smoke pipe bracket 30 also acts as a protective barrier, which can effectively prevent personnel from contacting the hot surface of the exhaust smoke pipe 40 to prevent burns, so the internal insulation of the exhaust smoke pipe 40 can be simplified or even cancelled, thereby further reducing the weight; in addition, the weight of the exhaust silencer 10 is also completely borne by the supporting chassis 20, thereby further reducing the weight of the chimney and meeting the requirements for limiting the weight of the exhaust chimney under specific conditions.
[0037] Alternatively, if Figure 1-2 As shown, the exhaust silencer 10 includes an exhaust silencer 11 vertically supported in a supporting frame 20, and an exhaust elbow 12 vertically connected to the side wall of the bottom end of the exhaust silencer 11. The bottom end of the exhaust smoke pipe 40 is detachably fixed to the top end of the exhaust silencer 11 along the axial direction. The exhaust elbow 12 is used to be connected to the exhaust port of the gas turbine through a soft connection 121 provided at its air inlet end. In this optional solution, the exhaust silencer 10 is connected to the exhaust port of the gas turbine through the soft connection 121 at its air inlet end, thereby absorbing the thermal expansion along the axial direction of the gas turbine without causing excessive axial force to the exhaust port of the gas turbine, thereby ensuring the long-term normal operation of the gas turbine. In this optional solution, the exhaust elbow 12, the exhaust silencer 11 and other parts at the lower part of the chimney are separately supported by the small supporting frame 20 at the bottom of the exhaust elbow 12, thereby reducing the load-bearing requirements of the smoke pipe bracket 30.
[0038] Alternatively, if Figure 2-3As shown, the exhaust smoke duct 40 includes a bottom exhaust straight pipe 41, one or more sections of intermediate exhaust straight pipes 42, and a top exhaust straight pipe 43, which are arranged in sequence along the axial direction and connected end to end. The bottom end of the bottom exhaust straight pipe 41 is detachably fixed to the top of the exhaust silencer 10. The bottom exhaust straight pipe 41, one or more sections of intermediate exhaust straight pipes 42, and the top exhaust straight pipe 43 are also supported on the smoke duct bracket 30 at the corresponding position through the support assembly 50. In this optional scheme, the exhaust smoke duct 40 adopts an end-to-end plug-in structure between each section, which is convenient for on-site installation and can effectively avoid the thermal stress generated by the exhaust smoke duct 40 when heated, thereby solving the problems of air leakage and heat leakage caused by the traditional integrated structure that is easily affected by thermal stress and thermal fatigue, thereby avoiding safety threats to on-site unit maintenance personnel and ensuring the safe and stable operation of the gas turbine.
[0039] In this option, if Figure 3-4 As shown, the bottom exhaust straight pipe 41 and the middle exhaust straight pipe 42 both include a straight pipe section and a plug-in section that is transitionally connected to the top of the straight pipe section and has an outer diameter smaller than the outer diameter of the straight pipe section. The bottom exhaust straight pipe 41 and the middle exhaust straight pipe 42, the adjacent middle exhaust straight pipes 42, and the middle exhaust straight pipe 42 and the top exhaust straight pipe 43 are plug-in connected through the plug-in section, and there is also a gap along the axial direction at the plug-in point of the two. When there is axial thermal expansion, the expansion is absorbed by the plug-in section, and no thermal stress is generated on the structure.
[0040] In this option, if Figure 3 As shown, the top exhaust straight pipe 43 includes one section, or the top exhaust straight pipe 43 includes multiple sections arranged in sequence along the axial direction, and the multiple sections of the top exhaust straight pipe 43 are fixedly connected end to end.
[0041] Alternatively, if Figure 1 and Figure 3 As shown, the support assembly 50 includes a plurality of sliding supports 51 arranged in sequence along the circumference of the bottom exhaust straight pipe 41, a plurality of first fixed supports 52 arranged in sequence along the circumference of the middle exhaust straight pipe 42, a plurality of inclined plane centering supports 53 and a plurality of second fixed supports 54 arranged in sequence along the circumference of the upper and lower ends of the top exhaust straight pipe 43. The sliding support 51 is connected between the bottom exhaust straight pipe 41 and the smoke pipe support 30 to enable the bottom exhaust straight pipe 41 to slide and support on the smoke pipe support 30 in the radial direction. The first fixed support 52 is connected between the middle exhaust straight pipe 42 and the smoke pipe support 30 to enable the middle exhaust straight pipe 42 to be slightly moved and supported on the smoke pipe support 30 in the radial direction. The second fixed support 54 is connected between the top exhaust straight pipe 43 and the smoke pipe support 30 to enable the top exhaust straight pipe 43 to be slightly moved and supported on the smoke pipe support 30 in the radial direction. The inclined plane centering support 53 is connected between the top exhaust straight pipe 43 and the smoke pipe support 30 so as to enable the top exhaust straight pipe 43 to be automatically centered and supported on the smoke pipe support 30 .
[0042] In this option, if Figure 2 and Figure 8 As shown, the sliding support 51 includes a connecting seat 511 fixed on the outer circle of the bottom exhaust straight pipe 41, two mounting seats 512 correspondingly fixed on the smoke pipe bracket 30 and arranged relatively spaced apart, and a limiting bolt 513 installed on each mounting seat 512. The connecting seat 511 is supported on the smoke pipe bracket 30 between the two correspondingly arranged groups of mounting seats 512, and the two groups of limiting bolts 513 are respectively pressed against the two sides of the connecting seat 511 for limiting. Figure 2 As shown, the bottom of the air inlet of the bottom exhaust straight pipe 41 is connected to the air outlet of the contraction section arranged at the top of the exhaust silencer 10 by bolts, and is also connected to the smoke pipe bracket 30 by a sliding support 51; the connecting seat 511 is limited by the limiting bolts 513 on both sides, so that the position can be adjusted and radial sliding is allowed to achieve the purpose of absorbing radial thermal deformation.
[0043] In this option, if Figure 2 and Figure 6-7 As shown, the first fixed support 52 and the second fixed support 54 have the same structure. The first fixed support 52 includes a fixed seat 521 fixed on the outer circle of the middle exhaust straight pipe 42 and a connecting bolt 522 for connecting. The fixed seat 521 is supported on the smoke pipe bracket 30 and is provided with a long strip hole 5211 that penetrates the plate surface and extends radially in a strip shape. The connecting bolt 522 is connected to the smoke pipe bracket 30 and penetrates into the corresponding long strip hole 5211, thereby allowing the middle exhaust straight pipe 42 to produce a small amount of thermal displacement in the radial direction to avoid excessive thermal stress.
[0044] In this option, if Figure 2 and Figure 5 As shown, the inclined plane centering support 53 includes an upper wedge support 531 fixed on the outer circle of the top exhaust straight pipe 43 and a lower wedge support 532 correspondingly fixed on the smoke pipe bracket 30. The upper wedge support 531 and the corresponding lower wedge support 532 are in contact with each other, and the contact point between the two is provided with a centering inclined surface 530 extending downward from the outside to the center in a radial direction. In this optional solution, the top exhaust straight pipe 43 is connected to the smoke pipe bracket 30 through the second fixed support 54 below. The second fixed support 54 has a long strip hole in the radial direction to absorb radial thermal deformation; at the same time, the upper wedge support 531 and the lower wedge support 532 of the inclined plane centering support 53 are used for auxiliary positioning, and automatic centering is realized, which can absorb the radial and axial expansion after heating.
[0045] Optionally, a heat insulation layer is provided on the inner circumferential surface of the exhaust smoke pipe 40 .
[0046] Optionally, the smoke pipe bracket 30 is arranged in multiple sections along the axial direction, and two adjacent sections of the smoke pipe bracket 30 are detachably fixed, which is convenient for on-site installation.
[0047] The preferred embodiment of the utility model also provides a gas turbine unit, including a gas turbine, and an exhaust chimney for the gas turbine as described above. The air inlet end of the exhaust chimney for the gas turbine is connected to the exhaust port of the gas turbine. The gas turbine unit of the utility model, because the exhaust port of its gas turbine is connected to the exhaust chimney of the utility model, can effectively simplify the structure of the smoke pipe, facilitate the design of its internal insulation structure, and reduce the weight of the chimney, effectively reducing the production cost. At the same time, the smoke pipe bracket 30 also acts as a protective barrier, which can effectively prevent people from contacting the hot surface of the exhaust smoke pipe 40 to prevent burns. Therefore, the heat insulation inside the exhaust smoke pipe 40 can be simplified or even eliminated, thereby further reducing the weight.
[0048] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. An exhaust chimney for a gas turbine, characterized in that: include: An exhaust muffler device (10) for treating exhaust gas, a support base (20) and a smoke pipe bracket (30) for mounting and supporting, an exhaust smoke pipe (40) for guiding the exhaust gas upward, and a support assembly (50) for supporting and connecting; The supporting frame (20) is supported on the ground, the exhaust silencer (10) is vertically supported in the supporting frame (20), and the air inlet end thereof is used to be connected to the exhaust port of the gas turbine; The smoke pipe bracket (30) is vertically supported on the top of the supporting base frame (20), the exhaust smoke pipe (40) is vertically supported in the smoke pipe bracket (30) through the support assembly (50), and the bottom end of the exhaust smoke pipe (40) is connected to the top of the exhaust silencer (10).
2. The gas turbine exhaust chimney according to claim 1, characterized in that: The exhaust muffler device (10) comprises an exhaust muffler (11) vertically supported in a supporting frame (20), and an exhaust elbow (12) vertically connected to the side wall at the bottom end of the exhaust muffler (11); The bottom end of the exhaust smoke pipe (40) is detachably fixed to the top end of the exhaust muffler (11) along the axial direction; The exhaust elbow (12) is used to be connected to the exhaust port of the gas turbine through a flexible connection (121) arranged at its air inlet end.
3. The gas turbine exhaust chimney according to claim 1, characterized in that: The exhaust smoke pipe (40) comprises a bottom exhaust straight pipe (41), one or more sections of middle exhaust straight pipes (42), and a top exhaust straight pipe (43) which are sequentially arranged along the axial direction and plug-connected end to end. The bottom end of the bottom exhaust straight pipe (41) is detachably fixed to the top end of the exhaust muffler device (10); The bottom exhaust straight pipe (41), one or more sections of intermediate exhaust straight pipes (42), and the top exhaust straight pipe (43) are also supported on the smoke pipe bracket (30) at corresponding positions through the support assembly (50).
4. The gas turbine exhaust chimney according to claim 3, characterized in that: The bottom exhaust straight pipe (41) and the middle exhaust straight pipe (42) both include a straight pipe section and a plug-in section transitionally connected to the top end of the straight pipe section and having an outer diameter smaller than the outer diameter of the straight pipe section; The bottom exhaust straight pipe (41) and the middle exhaust straight pipe (42), the adjacent middle exhaust straight pipes (42), and the middle exhaust straight pipe (42) and the top exhaust straight pipe (43) are respectively connected by plug-in sections, and a gap is provided at the plug-in locations of the two.
5. The gas turbine exhaust chimney according to claim 3, characterized in that: The support assembly (50) comprises a plurality of groups of sliding supports (51) arranged in sequence and at intervals along the circumference of the bottom exhaust straight pipe (41), a plurality of groups of first fixed supports (52) arranged in sequence and at intervals along the circumference of the middle exhaust straight pipe (42), a plurality of groups of inclined plane centering supports (53) and a plurality of groups of second fixed supports (54) arranged in sequence and at intervals along the circumference of the upper and lower ends of the top exhaust straight pipe (43); The sliding support (51) is connected between the bottom exhaust straight pipe (41) and the smoke pipe support (30) so as to enable the bottom exhaust straight pipe (41) to slide radially and be supported on the smoke pipe support (30); The first fixed support (52) is connected between the middle exhaust straight pipe (42) and the smoke pipe support (30) to enable the middle exhaust straight pipe (42) to be slightly moved radially and supported on the smoke pipe support (30); The second fixed support (54) is connected between the top exhaust straight pipe (43) and the smoke pipe support (30) to enable the top exhaust straight pipe (43) to be slightly moved radially and supported on the smoke pipe support (30); The inclined plane centering support (53) is connected between the top exhaust straight pipe (43) and the smoke pipe support (30) so as to enable the top exhaust straight pipe (43) to be automatically centered and supported on the smoke pipe support (30).
6. The gas turbine exhaust chimney according to claim 5, characterized in that: The sliding support (51) comprises a connecting seat (511) fixed on the outer circle of the bottom exhaust straight pipe (41), two mounting seats (512) fixed on the smoke pipe bracket (30) and arranged relatively spaced apart, and a limiting bolt (513) installed on each mounting seat (512); The connecting seat (511) is supported on the smoke pipe bracket (30) between two sets of corresponding mounting seats (512), and the two sets of limiting bolts (513) are respectively pressed against two sides of the connecting seat (511) for limiting.
7. The gas turbine exhaust chimney according to claim 5, characterized in that: The first fixed support (52) and the second fixed support (54) have the same structure. The first fixed support (52) comprises a fixed seat (521) fixed on the outer circle of the middle exhaust straight pipe (42) and a connecting bolt (522) having a connecting function. The fixed seat (521) is supported on the smoke pipe bracket (30) and is provided with a long strip hole (5211) penetrating the plate surface and extending in the radial direction in a strip shape. The connecting bolt (522) is connected to the smoke pipe bracket (30) and penetrates into the corresponding long strip hole (5211). The inclined plane centering support (53) comprises an upper wedge support (531) fixed on the outer circle of the top exhaust straight pipe (43) and a lower wedge support (532) correspondingly fixed on the smoke pipe bracket (30). The upper wedge support (531) and the corresponding lower wedge support (532) are in contact with each other, and a centering inclined plane (530) extending downwardly from the outside to the center along the radial direction is provided at the contact point between the two.
8. The gas turbine exhaust chimney according to claim 1, characterized in that: A heat insulation layer is provided on the inner peripheral surface of the exhaust smoke pipe (40).
9. The gas turbine exhaust chimney according to claim 1, characterized in that: The smoke pipe support (30) is arranged in multiple sections along the axial direction, and two adjacent sections of the smoke pipe support (30) are detachably fixed.
10. A gas turbine unit, characterized in that: A gas turbine and an exhaust chimney for a gas turbine as claimed in any one of claims 1 to 9; The air inlet end of the gas turbine exhaust chimney is connected to the exhaust port of the gas turbine.