A gas turbine combustor outlet measurement section cooling structure

Abstract

The utility model provides a kind of gas turbine combustion chamber outlet measuring section cooling structure, to solve the problem of traditional combustion chamber outlet measuring section water cooling system complex structure, the integration of measuring device is low and the low problem of measuring accuracy.The utility model mainly includes outer cover casing, front flange, rear flange, cooling water import, sensitive part mounting seat, two point gas cooling thermocouple, cooling gas interface, two point mixed sampler, flue gas sampling interface and backwater pipe interface.The utility model carries out integrated efficient cooling to measuring section body and measuring equipment, can effectively cope with superhigh temperature gas impact, ensure the accuracy of temperature measurement and flue gas sampling and the safety of equipment operation, while maintaining the structural integrity of measuring section itself, prolong its service life.

Description

Technical Field

[0001] This utility model relates to the field of gas turbine technology, and in particular to a cooling structure for the measuring section at the outlet of a gas turbine combustion chamber. Background Technology

[0002] Gas turbines are highly efficient thermodynamic power machines widely used in power generation, aviation, and marine propulsion. The combustion chamber outlet section typically houses temperature sensors (such as thermocouples) and flue gas sampling devices to monitor gas temperature and analyze gas composition, crucial for assessing combustion efficiency and controlling pollutant emissions. However, the gas temperature at the combustion chamber outlet is extremely high, reaching 1700K to 2300K, far exceeding the temperature resistance limits of conventional temperature sensing elements. Under these extreme conditions, sensors are highly susceptible to overheating and failure; prolonged high-temperature operation can also cause creep and warping deformation of metal components, compromising their sealing. To ensure reliable operation of the measuring equipment in this environment, effective cooling measures are essential.

[0003] While traditional water-cooling systems offer some effectiveness, they often suffer from complex structures, low integration of measuring devices, and low measurement accuracy. Insufficient cooling can lead to localized overheating, potentially causing thermal deformation or even cracking of the measuring section and equipment. This not only affects the accuracy of measurement data but also significantly shortens equipment lifespan, necessitating frequent downtime for replacement or repair, resulting in substantial time and economic costs.

[0004] Therefore, developing an efficient, reliable, and integrated cooling structure to ensure the long-term, stable, and accurate operation of the combustion chamber outlet measurement section under ultra-high temperature conditions is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] This application addresses the shortcomings of the prior art by providing a cooling structure for the measuring section at the outlet of a gas turbine combustion chamber. This structure effectively cools the measuring section body and measuring equipment in an integrated and efficient manner, thus effectively coping with the impact of ultra-high temperature gas, ensuring the accuracy of temperature measurement and flue gas sampling, as well as the safety of equipment operation, while maintaining the structural integrity of the measuring section itself and extending its service life.

[0006] The technical solution adopted in this utility model is as follows: A cooling structure for the outlet measuring section of a gas turbine combustion chamber, comprising an outlet measuring section body, The outlet measuring section body has a double-layer hollow wall structure, with an internal annular cooling water cavity; The front end of the outlet measuring section body is provided with a front flange, and at least one cooling water inlet is connected to its left side; The rear end of the outlet measuring section body is provided with a rear flange, and at least one return water pipe interface is connected to its right side. The outlet measurement section body is equipped with multiple sensor mounting bases for installing gas temperature detection devices and flue gas sampling detection devices.

[0007] Furthermore, the cooling water inlet is connected to the annular cooling water chamber, and the externally introduced cooling water flows through the annular cooling water chamber and is discharged from the return water pipe interface, forming a cooling circuit.

[0008] Furthermore, the gas temperature detection device is a two-point gas-cooled thermocouple, and each two-point gas-cooled thermocouple body is provided with a cooling gas interface.

[0009] Furthermore, the number of the two-point air-cooled thermocouples and the corresponding sensing element mounting bases is four, which are evenly distributed at one end of the outlet measuring section body near the front flange.

[0010] Furthermore, the flue gas sampling and detection device is a two-point mixing sampler, which is equipped with a flue gas sampling interface and a cooling water inlet.

[0011] Furthermore, there are two of the two-point mixing samplers, which are arranged at one end of the outlet measurement section body near the rear flange.

[0012] The advantages of this utility model over the prior art are as follows: (1) The body of the outlet measuring section adopts a double-layer hollow wall structure, forming an annular cooling water cavity inside. Cooling water is injected from the two cooling water inlets on the left side of the front flange, flows through the annular cavity, and is discharged from the return water pipe interface on the right side of the rear flange, forming efficient cooling convection, thereby achieving heat exchange and cooling.

[0013] 2) Four two-point air-cooled thermocouples are connected to cooling gas interfaces. The cooling gas improves the cooling effect through the interfaces, which helps to protect the thermocouples from damage at high temperatures and reduce data errors. 3) Since the flue gas sampling interface is connected to the cooling water inlet to form a water cooling system, it can ensure rapid cooling and distortion-free sampling under extreme operating conditions; 4) Both the outlet and the inlet are flange structures to ensure a sealed connection between the combustion chamber and the turbine section. Attached Figure Description

[0014] Fig. 1 This is a three-dimensional structural diagram of the present invention; Fig. 2 This is a schematic diagram of the structure of the two-point air-cooled thermocouple in this utility model; Fig. 3 This is a schematic diagram of the structure of the two-point mixing sampler in this utility model.

[0015] The components include: 1. Outer casing; 2. Front flange; 3. Rear flange; 4. Cooling water inlet; 5. Sensing unit mounting base; 6. Two-point air-cooled thermocouple; 7. Cooling gas interface; 8. Two-point mixing sampler; 9. Flue gas sampling interface; 10. Return water pipe interface. Detailed Implementation

[0016] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0017] This invention provides a cooling structure for the measuring section at the combustion chamber outlet of a gas turbine, aiming to solve the problems of complex structure, low integration of measuring devices, and low measurement accuracy in traditional water-cooling systems for the combustion chamber outlet measuring section.

[0018] like Figs. 1-3 As shown, it includes the outlet measurement section body. The outlet measurement section has a double-layer hollow wall structure with an internal annular cooling water cavity. The front end of the outlet measuring section body is provided with a front flange 2, and two cooling water inlets 4 are connected to its left side; The rear end of the outlet measuring section body is equipped with a rear flange 3, and two return water pipe interfaces 10 are connected to its right side; The outlet measurement section body is equipped with six sensor mounting bases 5, four of which are used to install gas temperature detection devices and two of which are used to install flue gas sampling detection devices.

[0019] In one embodiment of this utility model, the cooling water inlet 4 is connected to the annular cooling water chamber, and the externally introduced cooling water flows through the annular cooling water chamber and is discharged from the return water pipe interface 10 to form a cooling circuit.

[0020] In one embodiment of this utility model, the gas temperature detection element is a two-point gas-cooled thermocouple 6, and each two-point gas-cooled thermocouple 6 is provided with a cooling gas interface 7.

[0021] In one embodiment of this utility model, there are four two-point air-cooled thermocouples 6 and corresponding sensing part mounting bases 5, which are evenly distributed at one end of the outlet measuring section body near the front flange 2.

[0022] In one embodiment of this utility model, the flue gas sampling and detection device is a two-point mixing sampler 8, which is provided with a flue gas sampling interface 9 and a cooling water inlet 4.11.

[0023] In one embodiment of this utility model, there are two two-point mixing samplers 8, which are arranged at one end of the outlet measuring section body near the rear flange 3.

[0024] The specific structure and working principle of this utility model are as follows: See Fig. 1In a preferred embodiment, the cooling structure for the outlet measuring section of the gas turbine combustion chamber includes an outer casing 1, with a front flange 2 welded to its front end and two cooling water inlets 2 installed on its left side. A rear flange 3 is welded to the rear end of the outer casing 1, and two return water pipe interfaces 10 are installed on its right side. The outlet measuring section body adopts a double-layer hollow wall structure, forming an annular cooling water cavity inside. Cooling water is injected from the two cooling water inlets 2 on the left side of the front flange, flows through the annular cavity, and is discharged from the return water pipe interface 10 on the right side of the rear flange 3, forming efficient cooling convection. The entire system is sealed to the gas turbine body through front flange 2 and rear flange 3 to ensure that the high-temperature gas will not leak. That is, both the outlet and the inlet are flange structures to ensure the sealed connection between the combustion chamber and the turbine section.

[0025] Four sensor mounting bases 5 are installed on the exterior of the outer casing 1 near the front end and connected to four two-point air-cooled thermocouples 6. Two sensor mounting bases 5 are installed on the exterior of the outer casing 1 near the rear end and connected to two two-point sampling mixers 8.

[0026] Before measurement begins, cooling water enters the cooling water inlet 4 and flows through the combustion chamber outer casing 1 to ensure that the temperature of the outlet measurement section remains within the long-term operating range of the high-temperature alloy. Cooling water exits from the return water pipe interface 10. At the start of measurement, to prevent damage to the two-point air-cooled thermocouples 6 due to excessive temperature, external cold air enters the cooling gas interface 7 to lower the thermocouple operating temperature to the material's tolerance range. The two-point air-cooled thermocouples 6 are then used to measure the gas temperature. A two-point mixing sampler 8 samples the gas at the flue gas sampling interface 9. To ensure the accuracy of the analysis results on gas composition and pollutant emissions, the two flue gas sampling interfaces 9 are connected to two different models of flue gas detection devices. Optionally, in this embodiment, these can be a domestic flue gas detection device and a German flue gas detection device, allowing for comparison of the measured results. To obtain the true chemical state of the gas at the moment of sampling, cooling water enters from the cooling water interface 11, ensuring that the final analysis results accurately reflect the actual operating conditions at the combustion chamber outlet.

[0027] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A cooling structure for the measuring section at the outlet of a gas turbine combustion chamber, characterized in that: Including the main body of the exit measurement section, The outlet measuring section body has a double-layer hollow wall structure, with an internal annular cooling water cavity; The front end of the outlet measuring section body is provided with a front flange (2), and at least one cooling water inlet (4) is connected to its left side. The rear end of the outlet measuring section body is provided with a rear flange (3), and at least one return water pipe interface (10) is connected to its right side. The outlet measurement section body is provided with multiple sensor mounting bases (5) for installing gas temperature detection devices and flue gas sampling detection devices.

2. The cooling structure for the measuring section at the outlet of a gas turbine combustion chamber as described in claim 1, characterized in that: The cooling water inlet (4) is connected to the annular cooling water chamber. The externally introduced cooling water flows through the annular cooling water chamber and is discharged from the return water pipe interface (10) to form a cooling circuit.

3. The cooling structure for the measuring section at the outlet of a gas turbine combustion chamber as described in claim 1, characterized in that: The gas temperature detection device is a two-point air-cooled thermocouple (6), and each two-point air-cooled thermocouple (6) has a cooling gas interface (7) on its body.

4. The cooling structure for the measuring section at the outlet of a gas turbine combustion chamber as described in claim 3, characterized in that: The number of the two-point air-cooled thermocouples (6) and the corresponding sensing part mounting bases (5) is four, which are evenly distributed at one end of the outlet measuring section body near the front flange (2).

5. The cooling structure for the measuring section at the outlet of a gas turbine combustion chamber as described in claim 1, characterized in that: The flue gas sampling and detection device is a two-point mixing sampler (8), which is provided with a flue gas sampling interface (9) and a cooling water interface (11).

6. The cooling structure for the measuring section at the outlet of a gas turbine combustion chamber as described in claim 5, characterized in that: The number of the two-point mixed samplers (8) is two, which are arranged at one end of the outlet measurement section body near the rear flange (3).

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