A low emission combustor support ring

Abstract

The application belongs to the field of combustion chamber design, and particularly relates to a low-emission combustion chamber support ring, which comprises a support ring and a door-shaped pressing block. The support ring is arranged between a flame tube and a casing and is in the form of a wavy annular strip. The door-shaped pressing block is connected between the support ring and the flame tube in multiple groups and at intervals, and the support ring and the flame tube are fixed to each other. The support ring can freely slide in the circumferential direction after passing through the door-shaped pressing block. The complete 'convex' annular structure is adopted to improve the support rigidity and the damping effect on vibration. The door-shaped pressing block is used to install the support ring, so that the stress concentration problem of spot welding seams is avoided, the structural reliability is improved, and the support ring can freely slide in the circumferential direction under the pressing block, so that the deformation coordination capability is improved. Even under the working condition of the gap change between cold and hot states, the damping effect can be continuously exerted, the vibration fatigue of the flame tube is reduced, and the overall service life of the combustion chamber is prolonged.

Description

Technical Field

[0001] This application belongs to the field of combustion chamber design, and specifically relates to a low-emission combustion chamber support ring. Background Technology

[0002] As a hot-end component, the lifespan of the combustion chamber directly determines the service life of the gas turbine. Within the combustion chamber, the lifespan of the flame tube directly determines the lifespan of the combustion chamber itself. Therefore, to improve the lifespan of a gas turbine, it is essential to first improve the lifespan of the combustion chamber flame tube. The flame tube bears the highest gas temperature in the gas turbine, while also enduring vibration stress, making it very difficult to extend its lifespan. Under the national goals of "carbon neutrality" and "carbon peaking," gas turbines, with their low-emission characteristics, are gradually replacing traditional power plants and becoming the main power source for thermal power generation and mechanical power.

[0003] Currently, low-emission combustion chambers mostly adopt a single-tube design, with a segmented "M"-shaped support structure between the flame tube and the casing to ensure airflow clearance and dampen vibration of the flame tube. The "M"-shaped support structure is connected to the flame tube base using resistance welding.

[0004] It has the following disadvantages:

[0005] 1. Poor damping effect: The temperature difference between the flame tube wall and the casing wall is large. Under hot conditions, the gap between the flame tube and the casing is significantly smaller than that under cold conditions. The segmented "M" shaped structure has weak rigidity and limited deformation coordination ability, resulting in a poor damping effect on vibration.

[0006] 2. Vulnerable ring of support structure: When the gap between the flame tube and the casing becomes significantly smaller, the "M"-shaped structure will be subjected to great stress, which can easily lead to the weld between the "M"-shaped structure and the flame tube wall breaking or cracking, resulting in hardware damage.

[0007] Therefore, how to enhance the damping effect of the low-emission combustion chamber and improve the reliability of the supporting structure is a problem that needs to be solved. Summary of the Invention

[0008] To address the aforementioned issues, this application provides a low-emission combustion chamber support ring, which solves the problems of poor damping effect and easily damaged support structure rings in the prior art.

[0009] The technical solution of this application is: a low-emission combustion chamber support ring, comprising a support ring and a gate-shaped pressure block;

[0010] The support ring is located between the flame tube and the casing, and is a wavy annular strip; there are multiple sets of gate-shaped pressure blocks that are connected at intervals between the support ring and the flame tube, fixing the support ring and the flame tube to each other;

[0011] After passing through the U-shaped pressing block, the support ring can slide freely in the circumferential direction.

[0012] Preferably, the circumferential direction of the support ring is formed by repeatedly connecting a number of convex-shaped units in positive and negative directions, and the corners of the convex-shaped units are transitioned by arcs.

[0013] Preferably, the gap height of the U-shaped pressing block is greater than the thickness of the support ring, and the width of the U-shaped pressing block is greater than the width of the support ring.

[0014] Preferably, both ends of the U-shaped pressing block are welded to the combustion chamber liner by fillet welding.

[0015] Preferably, the support ring is made of an elastic and high-temperature-resistant metal material, and the U-shaped pressing block is made of a high-temperature-resistant material that meets specific strength requirements.

[0016] Preferably, the length direction of the U-shaped pressing block is arranged along the width direction of the support ring. Both ends of the U-shaped pressing block are in welded cooperation with the combustion chamber liner, and the middle part of the U-shaped pressing block is in sliding cooperation with the support ring.

[0017] The support ring of the low-emission combustion chamber of the present application has the following advantages:

[0018] Adopting a complete "convex"-shaped ring structure improves the support rigidity and enhances the damping effect on vibration. Installing the support ring with a "U"-shaped pressing block avoids the stress concentration problem of the fillet weld, improves the structural reliability, and at the same time, the support ring can slide freely in the circumferential direction under the pressing block, improving the deformation coordination ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present application;

[0020] Figure 2 is a schematic diagram of the installation structure of the support ring of the present application on the combustion chamber liner;

[0021] Figure 3 is a schematic diagram of the cooperation structure of the support ring and the U-shaped pressing block;

[0022] Figure 4 is a schematic diagram of the structure of the U-shaped pressing block of the present application.

[0023] 1. Support ring; 2. Combustion chamber liner; 3. U-shaped pressing block; 4. Casing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0025] The first aspect of this application provides a low-emission combustion chamber support ring 1, such as... Figures 1-2 It includes a support ring 1 and a gate-shaped pressure block 3.

[0026] The support ring 1 is located between the flame tube 2 and the casing 4, and is a wavy ring strip; there are multiple sets of gate-shaped pressure blocks 3, which are connected at intervals between the support ring 1 and the flame tube 2, and fix the support ring 1 and the flame tube 2 to each other.

[0027] After the support ring 1 passes through the gate-shaped pressure block 3, it can slide freely in the circumferential direction.

[0028] The structure adopts a combination of support ring 1 and multiple sets of portal-shaped pressure blocks 3 to replace the traditional segmented M-shaped support, resulting in stronger overall continuity and improved structural rigidity and vibration damping capacity. The portal-shaped pressure blocks 3 are arranged at intervals to achieve limiting and fixing, while the support ring 1 can slide freely along the circumference, which can adapt to thermal deformation and gap changes under the hot and cold conditions of the combustion chamber, release thermal extrusion stress, and avoid structural jamming and overload.

[0029] Preferably, the circumferential direction of the support ring 1 is formed by repeatedly connecting several convex units in opposite directions. The corners of the convex units are connected using rounded arcs, and the two ends of the support ring 1 are fixed by welding. Compared to ordinary annular or wave-shaped structures, this design further enhances the overall structural rigidity and strengthens the buffering and damping effect on the vibration of the flame tube 2. The rounded arc transition at the corners eliminates stress concentration problems caused by right-angle corners, reducing the risk of cracking under high temperature and alternating loads.

[0030] Preferably, the height of the gap in the portal-shaped pressure block 3 is greater than the thickness of the support ring 1, and the width of the portal-shaped pressure block 3 is greater than the width of the support ring 1. The internal gap of the portal-shaped pressure block 3 is greater than the corresponding dimensions of the support ring 1 in both height and width, leaving a reasonable sliding gap to ensure that the support ring 1 can slide smoothly in the circumferential direction during heat deformation and vibration, while avoiding hard friction and jamming between the two, and ensuring the stable realization of the deformation coordination function.

[0031] Preferably, the two ends of the gate-shaped pressure block 3 are welded to the flame tube 2 by fillet welding. The two ends of the gate-shaped pressure block 3 are fixed to the flame tube 2 by fillet welding, and the welding position is far away from the body of the support ring 1. The support ring 1 has no direct welding points, which completely avoids the defects of weld stress concentration, weld opening and breakage caused by traditional resistance spot welding.

[0032] Preferably, the support ring 1 is made of a high-temperature resistant metal material with elasticity, such as GH4145; the gate-shaped pressure block 3 is made of a high-temperature resistant material that meets specific strength requirements. The support ring 1 is made of a high-temperature resistant elastic metal material, which can maintain good elasticity and deformation capacity under the high-temperature working environment of the combustion chamber; the gate-shaped pressure block 3 is made of a high-strength high-temperature resistant material, which can maintain structural dimensions and fixed strength under high-temperature conditions and will not deform or fail.

[0033] Combination Figures 3-4 Preferably, the length of the portal-shaped pressure block 3 is arranged along the width of the support ring 1, the two ends of the portal-shaped pressure block 3 are welded to the flame tube 2, and the middle part of the portal-shaped pressure block 3 is slidably engaged with the support ring 1, such as GH536. By limiting the arrangement of the portal-shaped pressure block 3 along the width of the support ring 1, matching the outer dimensions of the support ring 1, the limiting guidance is more precise, and the constraint effect is better.

[0034] In summary, this application has the following advantages:

[0035] To address the shortcomings of existing low-emission combustors using segmented M-shaped support structures, such as poor vibration damping, easy cracking of welds, and weak adaptability to thermal deformation, a novel support structure composed of a support ring and a portal-shaped pressure block is proposed. The circumferentially continuous convex ring support structure has a much higher overall rigidity than the traditional segmented M-shaped support, which can effectively absorb and buffer the vibration generated by the operation of the flame tube. Even under the condition of cold and hot gap changes, it can continue to play a vibration reduction role, reduce flame tube vibration fatigue, and extend the overall service life of the combustor.

[0036] Relying on the pre-reserved fit gap between the portal-shaped pressure block and the support ring, the support ring can slide freely in the circumferential direction, which can adapt to the thermal expansion and contraction of the flame tube and the casing under high temperature conditions, release thermal extrusion stress in time, avoid structural overload and jamming due to gap changes, and adapt to the needs of operation under all working conditions.

[0037] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A low-emission combustion chamber support ring (1), characterized in that, Includes a support ring (1) and a gate-shaped pressure block (3); The support ring (1) is located between the flame tube (2) and the casing (4) and is a wavy annular strip; the gate-shaped pressure block (3) has multiple sets and is connected between the support ring (1) and the flame tube (2) at intervals, fixing the support ring (1) and the flame tube (2) to each other; The support ring (1) can slide freely in the circumferential direction after passing through the gate-shaped pressure block (3).

2. The low-emission combustion chamber support ring (1) as described in claim 1, characterized in that, The circumferential direction of the support ring (1) is formed by repeatedly connecting several convex units in opposite directions, and the corners of the convex units are connected by arcs.

3. The low-emission combustion chamber support ring (1) as described in claim 1, characterized in that, The gap height of the gate-shaped pressure block (3) is greater than the thickness of the support ring (1), and the width of the gate-shaped pressure block (3) is greater than the width of the support ring (1).

4. The low-emission combustion chamber support ring (1) as described in claim 1, characterized in that, The two ends of the gate-shaped pressure block (3) are welded to the flame tube (2) by fillet welding.

5. The low-emission combustion chamber support ring (1) as described in claim 1, characterized in that, The support ring (1) is made of a high-temperature resistant metal material with elasticity, and the gate-shaped pressure block (3) is made of a high-temperature resistant material that meets specific strength requirements.

6. The low-emission combustion chamber support ring (1) as described in claim 1, characterized in that, The length of the gate-shaped pressure block (3) is arranged along the width of the support ring (1). The two ends of the gate-shaped pressure block (3) are welded to the flame tube (2), and the middle part of the gate-shaped pressure block (3) is slidably engaged with the support ring (1).

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