Gas turbine exhaust metal expansion joint outer protection structure

Abstract

The utility model discloses a gas turbine exhaust metal expansion joint outer protection structure. At present, under the weight effect of a heat preservation layer, an inner protection plate collapses downwards and makes contact with a corrugated pipe. Due to the fact that a gas turbine has the characteristic of quick start and stop, long-term frequent cold and hot stretching working conditions of a metal expansion joint are caused, an outer protection plate and a corrugated pipe of the metal expansion joint are collided and abraded, the corrugated pipe is damaged and abraded through, and finally smoke leakage is caused. The expansion joint comprises an expansion joint and a plurality of sections of outer sheaths, the plurality of sections of outer sheaths are respectively sleeved on a corrugated expansion section of each section of expansion joint, a plurality of supports are welded on the circumference of the outer ring surface of a non-expansion plate of each section of expansion joint, and each support is connected with the outer sheath at the corresponding position through a bolt; the outer sheath is a reducing sleeve, and the reducing end is sleeved outside the adjacent outer sheath. The gas turbine exhaust metal expansion joint outer protection device is used for gas turbine exhaust metal expansion joint outer protection.

Description

Technical Field

[0001] The utility model relates to an outer protective structure of a combustion engine exhaust metal expansion joint. Background Art

[0002] The gas turbine exhaust system is the connecting section between the gas turbine and the waste heat boiler; the exhaust system is mainly composed of a metal expansion joint, a transition section, a diffusion section, a non-metallic expansion joint, and a supporting structure. The main function of the exhaust system is to expand and reduce the speed of the high-temperature, high-velocity gas discharged from the gas turbine into the waste heat boiler. In order to reduce the energy loss of the exhaust system, an insulation layer is designed in the exhaust system. In order to absorb the thermal expansion of the gas turbine, the end of the gas turbine is connected to the metal expansion joint, and the outlet of the metal expansion joint is trumpet-shaped and connected to the exhaust diffusion section. In order to avoid heat loss from the metal expansion joint, an outer protective plate is required outside the bellows of the gas turbine exhaust metal expansion joint, and thermal insulation material is applied to the outer protective plate to insulate. The current outer protective plate is in the form of a single annular plate, one end of which is fixed to the non-expansion plate of the expansion joint through a support, and the other end is not fixed but rests on the support. Under the weight of the insulation layer, the inner protective plate collapses and contacts the bellows. Due to the rapid start-stop characteristics of the gas turbine, the metal expansion joint is frequently subjected to long-term hot and cold expansion and contraction conditions. The outer guard plate rubs against the bellows of the metal expansion joint, causing the bellows to be damaged and worn through, ultimately leading to flue gas leakage. Utility Model Content

[0003] The purpose of the utility model is to provide a combustion engine exhaust metal expansion joint outer protective structure to solve the above-mentioned technical problems.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A gas turbine exhaust metal expansion joint outer protective structure, comprising an expansion joint and multiple outer sheaths, wherein the multiple outer sheaths are respectively sleeved on the corrugated expansion section of each expansion joint, and multiple supports are welded on the outer annular surface circumference of the non-expansion plate of each expansion joint, and each support is connected to the outer sheath at a corresponding position by bolts;

[0006] The outer sheath is a reducing sleeve, and the reducing sleeve is sleeved on the outside of the adjacent outer sheath.

[0007] In the outer protective structure of the combustion engine exhaust metal expansion joint, a pad is provided between the support and the fixing position of the outer sheath.

[0008] In the outer protective structure of the combustion engine exhaust metal expansion joint, a circular inner groove is provided on the portion of the outer protective sleeve that is connected to the support through bolts. Beneficial effects

[0009] 1. The utility model can improve the local stiffness of the outer sheath, reduce the thermal expansion of the outer guard plate, effectively prevent the local collapse of the outer guard plate, and ensure the supporting effect by changing the outer guard plate into a form of multi-section outer sheath supporting and protecting together.

[0010] 2. The outer sheath of the utility model is an annular reducing plate, and its reducing end is sleeved on the non-reducing end of another outer sheath, which can leave enough free expansion, making it suitable for long-term frequent hot and cold expansion conditions of metal expansion joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attachment Figure 1 It is a structural diagram of the utility model;

[0012] Attachment Figure 2 It is a side view of the utility model;

[0013] Attachment Figure 3 It is attached Figure 1 A magnified view of part A;

[0014] Attachment Figure 4 It is attached Figure 2 A magnified view of part B;

[0015] In the figure: 1. Support; 2. Outer sheath; 3. Expansion joint; 4. Non-expansion plate; 5. Fixing bolt; 6. Pad; 7. Circular inner groove; 8. Annular notch; 9. Corrugated expansion section. DETAILED DESCRIPTION

[0016] Reference Figure 1-Figure 4 A gas turbine exhaust metal expansion joint outer protective structure, which consists of an expansion joint 3 and a multi-section outer sheath 2, the multi-section outer sheaths are respectively sleeved on the corrugated expansion section 9 of each section of the expansion joint, and a plurality of supports 1 are welded on the outer circumference of the non-expansion plate 4 of each section of the expansion joint, and each of the supports is connected to the outer sheath at the corresponding position by a bolt 5;

[0017] The outer sheath is a reducing sleeve, and the reducing sleeve is sleeved on the outside of the adjacent outer sheath;

[0018] The outer sheath is a reducing sleeve, and its reducing end is sleeved on the non-reducing end of another outer sheath, which can leave enough free expansion, making it suitable for long-term frequent hot and cold expansion and contraction conditions of the metal expansion joint.

[0019] In the outer protective structure of the exhaust metal expansion joint of a combustion engine, a pad 6 is provided between the support and the fixing portion of the outer sheath.

[0020] The inner annular surface of the outer sheath has an annular notch 8, and the support is fixed at the annular notch. A pad is placed between the support and the outer sheath, and the support and the outer sheath are fixed by fixing bolts.

[0021] A circular inner groove 7 is provided on the portion of the outer sheath connected to the support by bolts, and the portion of the fixing bolt exposed from the outer sheath is located in the circular inner groove, which does not affect the movement of the adjacent outer sheath sleeve portion.

Claims

1. A gas turbine exhaust metal expansion joint outer protective structure, which comprises an expansion joint and a multi-section outer sheath, and is characterized by: The multiple sections of outer sheaths are respectively sleeved on the corrugated expansion section of each section of the expansion joint, and a plurality of supports are welded on the outer circumference of the non-expansion plate of each section of the expansion joint, and each of the supports is connected to the outer sheath at the corresponding position by bolts; The outer sheath is a reducing sleeve, and the reducing sleeve is sleeved on the outside of the adjacent outer sheath.

2. A combustion engine exhaust metal expansion joint outer protective structure according to claim 1, characterized in that: A pad is provided between the support and the fixing position of the outer sheath.

3. The outer protective structure of a metal expansion joint for exhaust gas turbine according to claim 2, characterized in that: A circular inner groove is provided on the portion of the outer sheath that is connected to the support through bolts.

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