A heat preservation device for the diffusion section of the exhaust cylinder of a combustion engine
By designing a thermal insulation device for the exhaust diffuser of the gas turbine, the vibration caused by the high flow rate of the medium in the exhaust diffuser of the gas turbine is solved, effective thermal insulation and vibration reduction are achieved, and the efficiency and safe and stable operation of the gas turbine are improved.
Patent Information
- Application Number
- CN202421547336.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-07-02
AI Technical Summary
The high flow rate of the medium in the exhaust diffuser of the gas turbine leads to vibration, causing the lining plate to fall off, the insulation cotton to blow, causing the blockage between the fins of the waste heat boiler pipe and local overtemperature in the exhaust diffusion section, affecting the unit efficiency and safe and stable operation.
A thermal insulation device for the diffusion section of the exhaust cylinder of the gas engine is designed, including an outer liner plate, an inner liner plate and an installation ring. An insulation layer is provided between the outer liner plate and the inner liner plate. The inner wall of the inner liner plate is fixed to the connecting rod through a convex ring and a mounting ring. It uses a loose cap and rivet to prevent loosening and reduce vibration through the buffer layer.
It effectively avoids loosening and vibration of the inner lining plate, prevents high-temperature flue gas from entering the insulation cotton through the gaps of the inner and outer lining plates, reduces the blockage and overtemperature problems of waste heat boilers, and improves the efficiency and safe and stable operation of the gas turbine.
Smart Images
Figure CN222702050U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas turbines, in particular to a heat preservation device for a diffusion section of an exhaust cylinder of a gas turbine. Background Art
[0002] In industrial gas turbines, the turbine exhaust velocity is relatively high, which results in greater exhaust losses and affects unit efficiency. In order to reduce this loss, the exhaust velocity must be reduced, so a diffuser is provided on the turbine exhaust side.
[0003] The gas turbine exhaust diffuser is the transition section between the gas turbine and the waste heat boiler. Its main function is to expand and reduce the pressure of the high-temperature spiral exhaust gas discharged by the gas turbine and guide it into a regular turbulent gas entering the inlet flue of the waste heat boiler, so that the various heating surfaces of the waste heat boiler can absorb the waste heat evenly and effectively, thereby improving the overall thermal efficiency, alleviating the thermal stress caused by uneven heating of the heating surfaces, avoiding stress concentration, and improving the safety of the operation of the waste heat boiler.
[0004] However, due to the high flow rate of the medium in the exhaust diffuser, high-frequency and low-amplitude vibrations are easily generated, and the gas turbine power plant is a frequent peak-shaving unit, which leads to more repeated vibrations, causing the inner lining plate to fall off frequently in the exhaust diffuser, resulting in the blowing of the insulation cotton between the inner and outer lining plates, causing blockage between the fins of the waste heat boiler tube screen and local overheating of the exhaust diffuser, seriously affecting the efficiency and safe and stable operation of the unit.
[0005] In the prior art, a spoiler is generally provided on the inner lining plate to prevent smoke from entering between the inner and outer lining plates and the insulation cotton. However, the inner wall of the inner lining plate caused by the spoiler is uneven, which may cause more vibrations in the diffuser and cause the inner lining plate to loosen. Moreover, the spoiler cannot completely prevent smoke from entering between the insulation cotton between the inner and outer lining plates through the connecting gap between the inner and outer lining plates. Utility Model Content
[0006] The utility model aims to provide a heat preservation device for the diffuser section of the exhaust cylinder of a combustion engine, which is used to solve the above-mentioned problems existing in the prior art.
[0007] In order to solve the above problems, the utility model provides a thermal insulation device for the diffusion section of the exhaust cylinder of a combustion engine, comprising an outer lining plate, an inner lining plate and a mounting ring, wherein an insulation layer is sandwiched between the outer lining plate and the inner lining plate; an annular mounting groove is provided on the inner wall of the outer lining plate, a convex ring facing the mounting groove is provided on the inner lining plate, a concave ring groove is formed between the convex ring and the inner wall of the inner lining plate, and the mounting ring can be embedded in the concave ring groove; a circumferential array of connecting rods that abut against the convex ring are fixed in the mounting groove, and the threads in the connecting rod cooperate with bolts, and the bolts fix the mounting ring and the convex ring on the connecting rod together; an anti-loosening groove is provided on the inner wall of the mounting ring, an anti-loosening cap is provided in the anti-loosening groove, a bolt head of the bolt is embedded in the anti-loosening cap, and the anti-loosening cap is fixed in the anti-loosening groove by a pin; the end of the anti-loosening cap and the end of the bolt are flush with the inner wall of the mounting ring, and the inner wall of the mounting ring is flush with the inner wall of the inner lining plate.
[0008] The heat preservation device for the diffusion section of the exhaust cylinder of the gas turbine provided by the utility model also has the following technical features:
[0009] Furthermore, inner butt ends and outer butt ends are respectively provided at the two ends of the outer lining plate, the length of the inner butt ends is smaller than that of the outer butt ends, and the multiple outer lining plates are fixedly connected through the inner butt ends and the outer butt ends, and an installation groove is formed between the fixedly connected inner butt ends and the outer butt ends.
[0010] Furthermore, chamfers are provided on both side surfaces of the mounting groove, and chamfers are also provided at the connection between the convex ring and the inner lining plate.
[0011] Furthermore, the radial distance from the protruding ring to the mounting groove is consistent with the radial distance from the inner lining plate to the outer lining plate.
[0012] Furthermore, the inner lining plate is integrally formed by splicing and fixing at the side wall.
[0013] Furthermore, the inner lining plate is formed by overlapping and splicing at the convex ring, and the bolts pass through the overlapping and splicing.
[0014] Furthermore, the outer lining plate and the inner lining plate are configured to be cones with the same inclination angle, and the connecting rod is perpendicular to the mounting groove.
[0015] Furthermore, the pin is configured as a rivet, the rivet passes through the mounting ring and the anti-loosening cap, and the rivet head of the rivet is fixed in a rivet cavity in the mounting ring.
[0016] Furthermore, a buffer layer is sandwiched between the outer lining plate and the inner lining plate.
[0017] The utility model has the following beneficial effects: the utility model of the heat preservation device of the diffusion section of the exhaust cylinder of the gas engine uses an inner lining plate of a special structure, and is used in conjunction with a mounting ring and an anti-loosening cap, so that the inner wall of the inner lining plate tends to be flat as a whole, and more vibrations that may cause the inner lining plate to loosen can be avoided; at the same time, the mounting ring and the anti-loosening cap can effectively cover the connecting gap between the inner and outer lining plates, thereby effectively preventing high-temperature flue gas from passing through the gap between the inner and outer lining plates and entering between the insulation cottons between the inner and outer lining plates. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0019] Figure 2 for Figure 1 Schematic diagram of the cross section along line AA in (the bolt at point B has structural decomposition);
[0020] Figure 3 for Figure 2 Another perspective view of
[0021] Figure 4 It is a cross-sectional schematic diagram of the outer lining plate and the mounting ring along the AA line;
[0022] Figure 5 for Figure 2 Detailed view of point B in FIG.
[0023] Figure 6 for Figure 3 Detailed view of C in the figure;
[0024] Figure 7 for Figure 3 Detailed view of D in FIG.
[0025] Figure 8 It is a structural schematic diagram of another embodiment of the inner lining plate of the utility model. DETAILED DESCRIPTION
[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.
[0027] like Figures 1 to 8In the embodiment of the thermal insulation device for the exhaust cylinder diffusion section of a combustion engine of the utility model shown, the thermal insulation device for the exhaust cylinder diffusion section of the combustion engine comprises an outer lining plate 1, an inner lining plate 2 and a mounting ring 3, and an insulating layer 4 is sandwiched between the outer lining plate 1 and the inner lining plate 2; the inner wall of the outer lining plate 1 is provided with a plurality of equidistantly arranged annular mounting grooves 101, and the inner lining plate 2 is provided with a convex ring 21 facing the mounting groove 101, and the convex ring 21 is fixedly connected to the inner lining plate 2 or is integrally arranged; a concave annular groove 201 is formed between the convex ring 21 and the inner wall of the inner lining plate 2, that is, the convex ring 21 has the same thickness as the inner lining plate 2, and the convex ring 21 extends out of the outer wall of the inner lining plate 2, so that a concave annular groove 201 is formed between the convex ring 21 and the inner wall of the inner lining plate 2; the mounting ring 3 can be embedded in the concave annular groove 201, and the mounting The ring 3 is used to connect the inner lining plate 2 and the outer lining plate 1; a circumferential array of connecting rods 11 that interfere with the convex ring 21 is fixed in the mounting groove 101, and the thread in the connecting rod 11 cooperates with the bolt 22, and the bolt 22 fixes the mounting ring 3 and the convex ring 21 together on the connecting rod 11; an anti-loosening groove 301 is provided on the inner wall of the mounting ring 3, and an anti-loosening cap 31 is provided in the anti-loosening groove 301, and the bolt head of the bolt 22 is embedded in the anti-loosening cap 31, and the anti-loosening cap 31 is fixed in the anti-loosening groove 301 by a pin to prevent the anti-loosening cap 31 and the bolt head from loosening due to vibration; the end of the anti-loosening cap 31 and the end of the bolt 22 are flush with the inner wall of the mounting ring 3, and the inner wall of the mounting ring 3 is flush with the inner wall of the inner lining plate 2, that is, the entire inner wall of the inner lining plate 2 remains flat.
[0028] The utility model has the following beneficial effects: the utility model of the heat preservation device of the diffusion section of the exhaust cylinder of the gas engine uses an inner lining plate of a special structure, and is used in conjunction with a mounting ring and an anti-loosening cap, so that the inner wall of the inner lining plate tends to be flat as a whole, and more vibrations that may cause the inner lining plate to loosen can be avoided; at the same time, the mounting ring and the anti-loosening cap can effectively cover the connecting gap between the inner and outer lining plates, thereby effectively preventing high-temperature flue gas from passing through the gap between the inner and outer lining plates and entering between the insulation cottons between the inner and outer lining plates.
[0029] In one embodiment of the present application, preferably, an inner butt end 12 and an outer butt end 13 are respectively provided at the two ends of the outer lining plate 1, the length of the inner butt end 12 is smaller than the outer butt end 13, and a plurality of outer lining plates 1 are fixedly connected via the inner butt ends 12 and the outer butt ends 13, and a mounting groove 101 is formed between the fixedly connected inner butt ends 12 and the outer butt ends 13; the outer lining plate 1 with a multi-section structure can be conveniently installed and maintained.
[0030] In one embodiment of the present application, preferably, chamfers 102 are provided on both side surfaces of the mounting groove 101, and a chamfer is also provided at the connection between the convex ring 21 and the inner lining plate 2; in this way, when the insulation layer 4 is arranged between the mounting groove 101 and the convex ring 21, the insulation layer 4 can be smoothly transitioned at the chamfer 102.
[0031] In one embodiment of the present application, preferably, the radial distance from the protruding ring 21 to the mounting groove 101 is consistent with the radial distance from the inner lining plate 2 to the outer lining plate 1; in this way, the thickness of the insulation layer 4 laid between the outer lining plate 1 and the inner lining plate 2 tends to be consistent, so that the insulation effect is good.
[0032] In one embodiment of the present application, preferably, the inner lining plate 2 is integrally formed by splicing and fixing at the side wall, such as by welding; before welding, the mounting ring 3 needs to be embedded in the concave ring groove 201 in advance, and the overall structural strength of the inner lining plate 2 supported by the overall splicing is good.
[0033] In one embodiment of the present application, preferably, Figure 8 As shown, the inner lining plate 2 is formed by overlapping and splicing at the convex ring 21, and the bolts 22 pass through the overlapping and splicing; the overlapping and splicing of the two convex rings 21 can be welded to strengthen the connection strength between the two convex rings 21, and the overlapping and splicing method can facilitate the installation operation; it can also be fixedly connected by only using bolts 22 to facilitate later maintenance operations.
[0034] In one embodiment of the present application, preferably, the outer lining plate 1 and the inner lining plate 2 are set to be cones with the same inclination angle, and the connecting rod 11 is perpendicular to the mounting groove 101. In this way, the extension direction of the connecting rod 11 is inclined toward the direction of the medium flow in the diffusion section, so the connecting rod 11 can avoid stress damage caused by the reverse force generated by the medium flow direction.
[0035] In one embodiment of the present application, preferably, the pin is configured as a rivet, the rivet passes through the mounting ring 3 and the anti-loosening cap 31, and the rivet head of the rivet is fixed in the rivet cavity 302 in the mounting ring 3; the rivet as a pin can effectively prevent the bolt 22 from loosening due to vibration and the like after long-term operation, and the rivet itself will not have the problem of loosening due to vibration.
[0036] In one embodiment of the present application, preferably, a buffer layer is sandwiched between the outer lining plate 1 and the inner lining plate 2. The buffer layer is made of soft and high temperature resistant material. The buffer layer can further prevent the inner lining plate 2 from being loosened due to the increase of vibration.
[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A heat preservation device for the diffuser section of a combustion engine exhaust cylinder, characterized in that: The invention comprises an outer lining plate (1), an inner lining plate (2) and a mounting ring (3), wherein a heat-insulating layer (4) is sandwiched between the outer lining plate (1) and the inner lining plate (2); an annular mounting groove (101) is provided on the inner wall of the outer lining plate (1), a convex ring (21) facing the mounting groove (101) is provided on the inner lining plate (2), a concave annular groove (201) is formed between the convex ring (21) and the inner wall of the inner lining plate (2), and the mounting ring (3) can be embedded in the concave annular groove (201); a circumferential array of connecting rods (11) that abut against the convex ring (21) are fixed in the mounting groove (101), and the connecting rods (11) ) cooperates with the bolt (22), and the bolt (22) fixes the mounting ring (3) and the convex ring (21) together on the connecting rod (11); the inner wall of the mounting ring (3) is provided with an anti-loosening groove (301), and an anti-loosening cap (31) is provided in the anti-loosening groove (301), and the bolt head of the bolt (22) is embedded in the anti-loosening cap (31), and the anti-loosening cap (31) is fixed in the anti-loosening groove (301) by a pin; the end of the anti-loosening cap (31) and the end of the bolt (22) are flush with the inner wall of the mounting ring (3), and the inner wall of the mounting ring (3) is flush with the inner wall of the inner lining plate (2).
2. The heat preservation device for the diffuser section of the exhaust cylinder of a combustion engine according to claim 1, characterized in that: An inner butt joint end (12) and an outer butt joint end (13) are respectively provided at two ends of the outer lining plate (1); the inner butt joint end (12) is shorter than the outer butt joint end (13); a plurality of outer lining plates (1) are fixedly connected via the inner butt joint ends (12) and the outer butt joint ends (13); and a mounting groove (101) is formed between the fixedly connected inner butt joint ends (12) and the outer butt joint ends (13).
3. The heat preservation device for the diffuser section of the exhaust cylinder of a combustion engine according to claim 2, characterized in that: Chamfers (102) are provided on both side surfaces of the mounting groove (101), and a chamfer is also provided at the connection between the convex ring (21) and the inner lining plate (2).
4. The heat preservation device for the diffuser section of the exhaust cylinder of a combustion engine according to claim 3, characterized in that: The radial distance from the convex ring (21) to the mounting groove (101) is consistent with the radial distance from the inner lining plate (2) to the outer lining plate (1).
5. The heat preservation device for the diffuser section of the exhaust cylinder of a combustion engine according to claim 4, characterized in that: The inner lining plate (2) is integrally formed by splicing and fixing at the side wall.
6. The heat preservation device for the diffuser section of the exhaust cylinder of a combustion engine according to claim 4, characterized in that: The inner lining plate (2) is formed by overlapping and splicing at the convex ring (21), and the bolts (22) pass through the overlapping and splicing.
7. The heat preservation device for the diffuser section of the exhaust cylinder of a combustion engine according to claim 5 or 6, characterized in that: The outer lining plate (1) and the inner lining plate (2) are configured to be tapered with the same inclination angle, and the connecting rod (11) is perpendicular to the mounting groove (101).
8. The heat preservation device for the diffuser section of the exhaust cylinder of a combustion engine according to claim 1, characterized in that: The pin is configured as a rivet, the rivet passes through the mounting ring (3) and the anti-loosening cap (31), and the rivet head of the rivet is fixedly disposed in a rivet cavity (302) in the mounting ring (3).
9. The heat preservation device for the diffuser section of the exhaust cylinder of a combustion engine according to claim 1, characterized in that: A buffer layer is also provided between the outer lining plate (1) and the inner lining plate (2).