The application relates to a mounting structure of a reparable thermocouple for a gas turbine combustion chamber, and a combustion chamber and a gas turbine

Abstract

The application provides a mounting structure of a gas turbine combustor, a combustor and a gas turbine, and the mounting structure comprises a thermocouple guide pipe and a thermocouple sleeve, the thermocouple sleeve is detachably connected to the thermocouple guide pipe, the thermocouple sleeve and the thermocouple guide pipe are coaxially arranged and in communication, and the outward end of the thermocouple sleeve is connected to the side wall of the casing through a mounting seat. The lead wire of the annealing thermocouple is inserted into the thermocouple guide pipe through the thermocouple sleeve and extends out of the extension port, the extension port is fixedly connected to the outer wall of the nozzle cover cylinder, and the measuring end of the lead wire is attached to the outer wall of the nozzle cover cylinder. The application realizes the function of replacing the annealing thermocouple without dismounting the combustor on the whole machine, realizes the repeated dismounting and replacement of the annealing thermocouple, reduces the risk of monitoring failure caused by the damage of the annealing thermocouple, and guarantees the reliability of the annealing monitoring function.

Description

Technical Field

[0001] This invention relates to the field of gas turbine technology, and in particular to an installation structure for a removable and reassembleable backfire thermocouple in a gas turbine combustion chamber, as well as the combustion chamber and the gas turbine. Background Technology

[0002] Heavy-duty gas turbines employ lean premixed combustion, which is prone to backfire and damage to the nozzle assembly. Therefore, during whole-unit testing or commercial operation, a backfire thermocouple is typically installed at the combustion chamber head to monitor for backfire. This backfire thermocouple is connected to the control system, with alarm and trip thresholds set. Once an alarm is triggered, corresponding protective actions are immediately executed, such as rapid load reduction and shutdown or tripping.

[0003] like Figure 9 , 10 As shown, the combustion chamber of a heavy-duty gas turbine mainly comprises the following components: a combustion chamber head assembly 13 (including a central nozzle assembly 1301, a peripheral nozzle assembly 1302, a fairing assembly 1303, a cap assembly 1304, an end cap assembly 1305, and a casing 7), a flow guide bushing assembly 14, a flame tube assembly 15, a transition section assembly 16, and related sealing components. The existing backfire detection scheme involves arranging thermocouple measuring points on the walls of the central and peripheral nozzle fairings. The thermocouple leads are led out through holes drilled in the outer ring of the cap and the casing, and the leads are fixed along their length with thin metal clamps. This thermocouple installation method is a one-time installation, meaning it is not removable. After the thermocouple end is fixed to the measuring point, the measuring point is permanently sealed inside the cap after the welding and installation of the cap components is completed.

[0004] The main disadvantages of the existing backfire detection scheme are: (1) The combustion chamber contains one central nozzle and six peripheral nozzles. A backfire thermocouple is installed on the outer wall of the cover of each nozzle to detect backfire. Thus, there are a total of seven backfire thermocouples in one combustion chamber. If the whole machine contains N combustion chambers, then the whole machine has 7N backfire thermocouples. Too many measuring points will bring additional complexity to manufacturing, installation and monitoring. (2) The backfire thermocouple measuring points are fixed along the process by metal clamps. It is a one-time installation. After installation, it is sealed in the combustion chamber cover and cannot be disassembled or replaced. If the backfire thermocouple is damaged during the operation of the whole machine, some backfire monitoring functions will be lost, which will bring unpredictable risks to the operation of the gas turbine and lose control and protection functions. Summary of the Invention

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention provide an installation structure for a removable and detachable flashback thermocouple in a gas turbine combustion chamber, as well as a combustion chamber and a gas turbine, making the flashback thermocouple easy to install and remove, and ensuring the reliability of the flashback monitoring function.

[0006] One embodiment of the present invention provides an installation structure for a reusable and removable tempering thermocouple in a gas turbine combustion chamber, comprising: a thermocouple conduit and a thermocouple sleeve, the thermocouple conduit having an insertion port and an extension port, the lead wire of the tempering thermocouple being adapted to pass through the insertion port into the thermocouple conduit and extend out from the extension port, the extension port being fixedly connected to the outer wall of the nozzle shroud, such that the measuring end of the lead wire extending out from the extension port is in contact with the outer wall of the nozzle shroud.

[0007] The thermocouple sleeve is detachably connected to the insertion port of the thermocouple conduit. The thermocouple sleeve is connected to and coaxially arranged with the thermocouple conduit. The outward end of the thermocouple sleeve is connected to the side wall of the casing through a mounting base. The lead of the tempered thermocouple is adapted to be inserted from the thermocouple sleeve into the thermocouple conduit.

[0008] In some embodiments, the thermocouple conduit includes an integrally formed straight section and a bent section, the angle between the straight section and the bent section being an obtuse angle, the bent section being fitted to the outer wall of the nozzle cover, and the protrusion being opened on the side of the bent section.

[0009] In some embodiments, the inner diameter of the thermocouple sleeve is greater than or equal to the inner diameter of the thermocouple conduit, and the inner diameter of the straight section is greater than the inner diameter of the bent section.

[0010] In some embodiments, the mounting base is a hollow tube with internal threads, the mounting base penetrates the side wall of the casing and is fixedly connected to the side wall of the casing, the outer wall of the thermocouple sleeve has external threads that mate with the internal threads of the mounting base, and the thermocouple sleeve and the mounting base are connected by threads.

[0011] In some embodiments, the outward end of the thermocouple sleeve is the inlet end, which has an internal thread. The inlet end is connected to the thermocouple sealing lead connector via the thread, and the lead of the tempered thermocouple is sequentially inserted into the thermocouple sleeve and the thermocouple conduit from the thermocouple sealing lead connector.

[0012] In some embodiments, an anti-loosening structure is designed between the mounting base and the thermocouple sleeve.

[0013] In some embodiments, the mounting structure of the reusable reheat thermocouple for the gas turbine combustion chamber further includes an adapter. The adapter is fixedly connected to the outer cylinder of the cover and penetrates the side wall of the outer cylinder. The adapter is connected between the thermocouple conduit and the thermocouple sleeve. The adapter is a hollow tube. The two ends of the adapter have a first socket and a second socket, respectively. The first socket is inserted into the thermocouple sleeve, and the second socket is connected to the insertion port of the thermocouple conduit. The thermocouple sleeve, the adapter, and the thermocouple conduit are connected in communication.

[0014] A second aspect of the present invention provides a combustion chamber including multiple nozzles and an installation structure for the aforementioned reusable and removable backfire thermocouple of a gas turbine combustion chamber. The nozzles include a central nozzle, a primary peripheral nozzle, and a secondary peripheral nozzle. The primary and secondary peripheral nozzles are distributed around the outer periphery of the central nozzle. The operating equivalence ratio of the primary peripheral nozzle is greater than that of the secondary peripheral nozzle. The nozzle shroud includes a central nozzle shroud, a primary peripheral nozzle shroud, and a secondary peripheral nozzle shroud. Several thermocouple conduits are provided and respectively installed on the outer wall of the central nozzle shroud and the outer wall of the primary peripheral nozzle shroud.

[0015] In some embodiments, the tempering thermocouple is a dual-armored thermocouple, and each dual-armored thermocouple acquires two thermocouple data.

[0016] A third aspect of the present invention provides a gas turbine including the combustion chamber described above. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings. in: Figure 1 This is a schematic diagram of the installation structure of the removable and reassembleable reheat thermocouple in the gas turbine combustion chamber according to an embodiment of the present invention. Figure 2 for Figure 1 Sectional view of plane AA in the middle; Figure 3 for Figure 2 An enlarged schematic diagram of the thermocouple conduit in the image; Figure 4 for Figure 2 A schematic diagram of the thermocouple sleeve in the diagram; Figure 5 for Figure 2 A schematic diagram of the mounting base in the diagram; Figure 6 for Figure 5 Internal structure diagram; Figure 7 for Figure 2 A schematic diagram of the internal structure of the adapter in the middle; Figure 8 for Figure 1 BB section view in the middle; Figure 9 This is a schematic diagram of the combustion chamber according to an embodiment of the present invention; Figure 10 for Figure 9 A schematic diagram of the combustion chamber head assembly in the middle; Figure label: 1. Thermocouple conduit; 101. Straight pipe section; 102. Bend section; 2. Thermocouple sleeve; 201. Inlet end; 3. First-stage peripheral nozzle cover; 4. Center nozzle cover; 5. Second-stage peripheral nozzle cover; 6. Diverging panel; 7. Casing; 8. Mounting base; 9. Adapter; 901. First socket; 902. Second socket; 10. Sealing gasket; 11. Elastic gasket; 12. Outer sleeve of the cover; 13. Combustion chamber head assembly; 1301. Center nozzle assembly; 1302. Peripheral nozzle assembly; 1303. Draft fairing assembly; 1304. Cover assembly; 1305. End cap assembly; 14. Guide bushing assembly; 15. Flame tube assembly; 16. Transition section assembly. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] The following description, with reference to the accompanying drawings, describes the installation structure of the removable and reassembleable backfire thermocouple for the gas turbine combustion chamber, the combustion chamber, and the gas turbine according to an embodiment of the present invention.

[0020] like Figures 1-8 As shown, one embodiment of the present invention proposes an installation structure for a reusable and removable tempering thermocouple in a gas turbine combustion chamber, comprising: a thermocouple conduit 1 and a thermocouple sleeve 2. The thermocouple conduit 1 has an insertion port and an extension port. The lead wire of the tempering thermocouple is adapted to pass through the insertion port into the thermocouple conduit 1 and extend out from the extension port. The extension port is fixedly connected to the outer wall of the nozzle cover, so that the measuring end of the lead wire extending out from the extension port is in contact with the outer wall of the nozzle cover.

[0021] Thermocouple sleeve 2 is detachably connected to the insertion port of thermocouple conduit 1. Thermocouple sleeve 2 is connected to thermocouple conduit 1 and coaxially arranged. The outward end of thermocouple sleeve 2 is connected to the side wall of housing 7 through mounting base 8. The lead of tempered thermocouple is adapted to be inserted from thermocouple sleeve 2 into thermocouple conduit 1.

[0022] This invention, through the configuration of thermocouple conduit 1 and thermocouple sleeve 2, enables the replacement of the tempering thermocouple without disassembling the combustion chamber, allowing for repeated disassembly and replacement of the tempering thermocouple. This reduces the risk of monitoring failure due to tempering thermocouple damage and ensures the reliability of the tempering monitoring function. Furthermore, it provides full-path protection for the tempering thermocouple leads, preventing them from being exposed to the high-speed airflow in the combustion chamber. The detachable design of the thermocouple sleeve 2 facilitates its replacement and maintenance.

[0023] It should be noted that the tempering thermocouple in this embodiment monitors the temperature of the outer wall of the nozzle shroud, and the leads of the tempering thermocouple do not penetrate the wall of the nozzle shroud. This is because if the leads of the tempering thermocouple penetrated the wall of the nozzle shroud, it would introduce an interference source into the nozzle premixing channel, forming a boundary layer, which is equivalent to adding an additional source of tempering risk.

[0024] Furthermore, the nozzle cover includes a central nozzle cover 4 and a primary peripheral nozzle cover 3.

[0025] Furthermore, the wall thickness of thermocouple conduit 1 is 0.8~1.5mm. The selection of wall thickness mainly takes into account the temperature and pressure range of the combustion chamber operation. For example, to ensure structural reliability under high temperature and high pressure environments, the wall thickness can be appropriately increased.

[0026] In some embodiments, such as Figure 3 As shown, the thermocouple conduit 1 includes an integrally formed straight pipe section 101 and a bent pipe section 102. The angle between the straight pipe section 101 and the bent pipe section 102 is an obtuse angle. The bent pipe section 102 is fitted to the outer wall of the nozzle cover, and the protrusion is opened on the side of the bent pipe section 102. This ensures that the measuring end of the tempered thermocouple is in close contact with the outer wall of the nozzle cover, providing sufficient heat conduction and ensuring the accuracy of the measurement results.

[0027] During installation, the lead wire of the tempered thermocouple is slowly inserted into the thermocouple conduit 1 and the thermocouple sleeve 2, so that the measuring end of the lead wire is located at the protrusion of the bend section 102.

[0028] Furthermore, for a thermocouple with a measuring end diameter of 2mm, the inner diameter of the bend section 102 is 2.5mm. The length of the bend section is designed to ensure a tight fit between the thermocouple's measuring end and the outer wall of the nozzle casing, allowing for sufficient heat conduction at the thermocouple's measuring end and ensuring the accuracy of the measurement results. This design can be tailored to specific needs. In this embodiment, the contact length between the thermocouple inserted into the bend section and the side wall of the casing is approximately 10mm.

[0029] Furthermore, the bending radius of the bend section 102 and the angle between the thermocouple conduit 1 and the radiating panel 6 are designed according to actual needs, with the principle of not affecting the aerodynamic cooling performance and structural integrity of the combustion chamber, not interfering with other components, and not affecting the installation of components such as instruments. In this embodiment, the bending radius of the bend section 102 at the central nozzle shroud 4 is 25mm, the angle between the thermocouple conduit 1 and the radiating panel 6 is 30°, and the bending radius of the bend section 102 at the primary peripheral nozzle shroud 3 is 30mm.

[0030] In some embodiments, such as Figure 2As shown, the inner diameter of the thermocouple sleeve 2 is greater than or equal to the inner diameter of the thermocouple conduit 1, and the inner diameter of the straight section 101 is greater than the inner diameter of the bent section 102. By reducing the inner diameter of the bent section 102, the measuring end of the lead wire can be more easily fitted to the outer wall of the nozzle cover.

[0031] Furthermore, the inner diameter of the bend section 102 is 2.5 mm, and the outer diameter of the measuring end of the tempered thermocouple is 2 mm.

[0032] In some embodiments, the mounting base 8 is a hollow tube with internal threads, the mounting base 8 penetrates the side wall of the casing 7 and is fixedly connected to the side wall of the casing 7, the outer wall of the thermocouple sleeve 2 has external threads that mate with the internal threads of the mounting base 8, and the thermocouple sleeve 2 and the mounting base 8 are connected by threads.

[0033] In some embodiments, such as Figure 2 , Figure 4 As shown, the outward end of the thermocouple sleeve 2 is the inlet end 201, which has an internal thread. The inlet end 201 is connected to the thermocouple sealing lead connector via the thread. The lead of the tempered thermocouple is inserted into the thermocouple sleeve 2 and the thermocouple conduit 1 in sequence from the thermocouple sealing lead connector.

[0034] The thermocouple sealing lead connector is threaded into the inlet end 201 of the thermocouple sleeve 2. The lead of the tempered thermocouple is sealed to the thermocouple sealing lead connector to ensure a tight seal. If the tempered thermocouple is damaged, the lead can be pulled out from the thermocouple sealing lead connector for replacement.

[0035] Furthermore, the internal thread of the inlet end 201 is an NPT thread.

[0036] Furthermore, the thermocouple sealed lead connector can be replaced with other sealing structures.

[0037] In some embodiments, a non-loosening fit is formed between the mounting base 8 and the thermocouple sleeve 2.

[0038] Furthermore, several anti-loosening holes are respectively opened at corresponding positions on the mounting base 8 and the inlet end 201 of the thermocouple sleeve 2. An iron wire is passed through the corresponding holes on the mounting base 8 and the anti-loosening holes on the inlet end 201, and then the two ends of the exposed iron wire are tightened and knotted. Alternatively, other methods can be used to prevent loosening.

[0039] In some embodiments, such as Figure 2 , Figure 7As shown, the installation structure of the reusable reheat thermocouple in the gas turbine combustion chamber also includes an adapter 9. The adapter 9 is fixedly connected to the outer cylinder 12 of the cap and passes through the side wall of the outer cylinder 12. The adapter 9 is connected between the thermocouple conduit 1 and the thermocouple sleeve 2. The adapter 9 is a hollow tube. The two ends of the adapter 9 have a first socket 901 and a second socket 902, respectively. The first socket 901 is inserted into the thermocouple sleeve 2, and the second socket 902 is connected to the insertion port of the thermocouple conduit 1. The thermocouple sleeve 2, the adapter 9 and the thermocouple conduit 1 are connected.

[0040] In this embodiment of the invention, the adapter 9 serves as a support and bridge, connecting the thermocouple conduit 1 and the thermocouple sleeve 2.

[0041] Furthermore, the inner diameter of the first socket 901 is slightly larger than the outer diameter of the thermocouple sleeve 2, and the inner diameter of the second socket 902 is slightly larger than the outer diameter of the thermocouple conduit 1, to ensure smooth connection between the thermocouple sleeve 2, the adapter 9, and the thermocouple conduit 1. For example, if the outer diameter of the thermocouple sleeve 2 is 10.2 mm, then the inner diameter of the first socket 901 is 10.6 mm.

[0042] Furthermore, the outer diameter of the thermocouple sleeve 2 is larger than the outer diameter of the thermocouple conduit 1, and the inner diameter of the first socket 901 is larger than the inner diameter of the second socket 902.

[0043] Furthermore, the installation method of thermocouple conduit 1 and thermocouple sleeve 2 includes the following steps: Step 1: Place the thermocouple conduit 1 inside the outer cylinder 12 of the nozzle cap, and weld and fix the protruding end of the bent section 102 of the thermocouple conduit 1 to the outer wall of the nozzle cap. Step 2: Make a hole in the side wall of the outer cylinder 12 of the cap and insert the adapter 9 so that the two ends of the adapter 9 extend out of the inner wall and outer wall of the outer cylinder 12 of the cap respectively. Insert the insertion port of the thermocouple conduit 1 into the second insertion port 902 of the adapter 9 and weld it in place. Fix the adapter 9 to the outer cylinder 12 of the cap by spot welding. Step 3: Assemble the diverging panel 6, the outer sleeve of the cap 12, and the nozzle sleeve to form the cap; Step 4: Make a hole in the side wall of the casing 7 and fix the mounting base 8, ensuring that the axis of the mounting base 8 is coaxial and collinear with the axis of the adapter 9. Pass the thermocouple sleeve 2 through the mounting base 8 from the outside to the inside and insert it into the first insertion port 901 of the adapter 9. At the same time, screw the inlet end 201 of the thermocouple sleeve 2 into the internal thread of the mounting base 8 to fix it. Step 5: Install the thermocouple sealing lead connector at the inlet end 201 of the thermocouple sleeve 2; Step 6: Assemble the casing 7, end cap assembly 1305, and cover assembly 1304; Step 7: Insert the lead of the tempered thermocouple into the thermocouple sealing lead connector, and insert the lead into the thermocouple sleeve 2 and the thermocouple conduit 1 in sequence. Due to the sufficiently long bend section 102, the measuring end of the lead is automatically pressed against the outer wall of the nozzle cover.

[0044] This layout ensures that the removal and installation of the tempering thermocouple will not affect the aerodynamic cooling performance and structural integrity of the combustion chamber, will not interfere with other components, and will not affect the installation of other parts such as instruments.

[0045] Furthermore, a sealing structure such as a sealing ring is provided between the thermocouple sleeve 2 and the first socket 901 of the adapter 9 to ensure airtightness. This prevents the high-speed airflow in the combustion chamber from damaging the leads of the tempered thermocouple or reducing the service life of the leads.

[0046] In some embodiments, such as Figure 2 As shown, a sealing gasket 10 and an elastic gasket 11 are provided at the connection between the mounting base 8 and the thermocouple sleeve 2. The sealing gasket 10 ensures the connection is airtight, and the elastic gasket 11 ensures the tightness between the thermocouple sleeve and the mounting base 8.

[0047] like Figure 1 As shown, a second aspect of the present invention provides a combustion chamber including multiple nozzles and the aforementioned installation structure for a reusable and removable backfire thermocouple in a gas turbine combustion chamber. The nozzles include a central nozzle, primary peripheral nozzles, and secondary peripheral nozzles, distributed around the outer periphery of the central nozzle. The operating equivalence ratio of the primary peripheral nozzles is greater than that of the secondary peripheral nozzles. The nozzle housing includes a central nozzle housing 4, a primary peripheral nozzle housing 3, and a secondary peripheral nozzle housing 5. Several thermocouple conduits 1 are provided and respectively installed on the outer walls of the central nozzle housing 4 and the primary peripheral nozzle housing 3. The installation method of the thermocouple conduits 1 in the central nozzle housing 4 and the primary peripheral nozzle housing 3 is the same.

[0048] The embodiments of the present invention can reduce the number of tempering thermocouples required, simplify the manufacturing and installation process, reduce the complexity of monitoring, and reduce procurement costs.

[0049] For example, in existing solutions, tempering thermocouples are arranged on both the central nozzle and the six peripheral nozzles. However, in this embodiment of the invention, the peripheral nozzles are classified into two primary peripheral nozzles and four secondary peripheral nozzles. Since the operating equivalence ratio of the primary peripheral nozzles is greater than that of the secondary peripheral nozzles, tempering thermocouples are only arranged on the central nozzle shroud 4 and the primary peripheral nozzle shroud 3. In other words, only three tempering thermocouples are needed. Compared with the existing solutions, four tempering thermocouples are reduced on each combustion chamber. If the entire machine contains N combustion chambers, then 4N thermocouples will be reduced.

[0050] It should be noted that, based on the nozzle operating mode and the range of the operating equivalence ratio (i.e., fuel-air mixture equivalence ratio) in the combustion chamber, the operating equivalence ratio of the first-stage peripheral nozzle is consistently higher than that of the second-stage peripheral nozzle throughout the entire operating range of the gas turbine, from start-up loading to load ramp-up to base load. Therefore, the risk of backfire is higher for the first-stage peripheral nozzle than for the second-stage peripheral nozzle. For simplicity and reliability in design, manufacturing, and monitoring, it is sufficient to install backfire thermocouples on the central nozzle and the first-stage peripheral nozzles to monitor the metal wall temperature of the casing, thus meeting the backfire monitoring requirements. When the backfire thermocouple detects that the metal wall temperature has risen to a preset value, the gas turbine TCS control and protection system activates an alarm, executing a rapid load reduction or turbine shutdown.

[0051] Furthermore, the combustion chamber outer perimeter nozzle grading scheme is "2+4", that is, the nozzle includes 1 central nozzle, 2 primary peripheral nozzles and 4 secondary peripheral nozzles. There are 3 thermocouple conduits 1, which are respectively installed on the outer wall of 1 central nozzle cover 4 and the outer wall of 2 primary peripheral nozzle covers 3.

[0052] Furthermore, such as Figure 1 As shown, the azimuth angles of the three thermocouple conduits 1 during installation can be determined according to design requirements. The principle is: the design should be simple and reliable, and should not affect the functional integrity (such as aerodynamics and cooling performance) and reliability (such as instrument interfaces) of the existing combustion chamber structure. In this embodiment, the azimuth angle β of the thermocouple conduit 1 of the central nozzle is 30°, and the azimuth angles α and γ of the thermocouple conduits 1 of the two peripheral nozzles are both 10°.

[0053] In some embodiments, the tempering thermocouples are dual-armored thermocouples, meaning each tempering thermocouple includes two leads, and each dual-armored thermocouple acquires data from two thermocouples. This provides redundant measurement points, improving the reliability of the measurement points and the control and protection system.

[0054] In this embodiment, each combustion chamber is equipped with 3 dual-armored thermocouples, and a total of 6 thermocouple data are obtained. The whole machine contains N combustion chambers, so there are a total of 6N tempering thermocouple temperature data.

[0055] The backfire monitoring method includes the following steps: Select the maximum temperature value from the thermocouple data of all combustion chambers in the gas turbine. The difference between the maximum temperature value and the temperature at the compressor outlet is dT. During the operation of the gas turbine, if dT>80℃, an alarm signal is issued, and the operating status of the combustion chamber nozzles needs to be closely monitored; if dT>100℃, protective actions are taken, such as a 2-second delay to trip the turbine.

[0056] A third aspect of the present invention provides a gas turbine including the combustion chamber described above.

[0057] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0061] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An installation structure for a reusable and re-attached tempering thermocouple in a gas turbine combustion chamber, characterized in that, include: Thermocouple conduit has an insertion port and an extension port. The lead wire of the tempered thermocouple is adapted to pass through the insertion port into the thermocouple conduit and extend out from the extension port. The extension port is fixedly connected to the outer wall of the nozzle shroud, so that the measuring end of the lead wire extending out from the extension port is in contact with the outer wall of the nozzle shroud. A thermocouple sleeve is detachably connected to the insertion port of the thermocouple conduit. The thermocouple sleeve is connected to and coaxially arranged with the thermocouple conduit. The outward end of the thermocouple sleeve is connected to the side wall of the casing via a mounting base. The lead of the tempered thermocouple is adapted to be inserted from the thermocouple sleeve into the thermocouple conduit.

2. The installation structure of the reusable reheat thermocouple in the gas turbine combustion chamber according to claim 1, characterized in that, The thermocouple conduit includes an integrally formed straight section and a bent section, the angle between the straight section and the bent section is an obtuse angle, the bent section is fitted to the outer wall of the nozzle cover, and the protrusion is opened on the side of the bent section.

3. The installation structure of the reusable reheat thermocouple in the gas turbine combustion chamber according to claim 2, characterized in that, The inner diameter of the thermocouple sleeve is greater than or equal to the inner diameter of the thermocouple conduit, and the inner diameter of the straight section is greater than the inner diameter of the bent section.

4. The installation structure of the reusable reheat thermocouple in the gas turbine combustion chamber according to claim 1, characterized in that, The mounting base is a hollow tube with internal threads. The mounting base penetrates the side wall of the casing and is fixedly connected to the side wall of the casing. The outer wall of the thermocouple sleeve has external threads that mate with the internal threads of the mounting base. The thermocouple sleeve and the mounting base are connected by threads.

5. The installation structure of the reusable reheat thermocouple in the gas turbine combustion chamber according to claim 1, characterized in that, The outward-facing end of the thermocouple sleeve is the inlet end, which has an internal thread. The inlet end is connected to the thermocouple sealing lead connector via the thread. The lead of the tempered thermocouple is inserted sequentially into the thermocouple sleeve and the thermocouple conduit from the thermocouple sealing lead connector.

6. The installation structure of the reusable reheat thermocouple in the gas turbine combustion chamber according to claim 5, characterized in that, The mounting base and the thermocouple sleeve form an anti-loosening fit.

7. The installation structure of the reusable reheat thermocouple in the gas turbine combustion chamber according to claim 1, characterized in that, It also includes an adapter, which is fixedly connected to the outer cylinder of the cap and penetrates the side wall of the outer cylinder. The adapter is connected between the thermocouple conduit and the thermocouple sleeve. The adapter is a hollow tube. The two ends of the adapter have a first socket and a second socket, respectively. The first socket is inserted into the thermocouple sleeve, and the second socket is connected to the insertion port of the thermocouple conduit. The thermocouple sleeve, the adapter, and the thermocouple conduit are connected in communication.

8. A combustion chamber comprising a plurality of nozzles, characterized in that, The invention includes the installation structure of the removable and reassembled backfire thermocouple for a gas turbine combustion chamber as described in any one of claims 1-7. The nozzle includes a central nozzle, a primary peripheral nozzle, and a secondary peripheral nozzle. The primary peripheral nozzle and the secondary peripheral nozzle are distributed around the outer periphery of the central nozzle. The operating equivalent ratio of the primary peripheral nozzle is greater than that of the secondary peripheral nozzle. The nozzle cover includes a central nozzle cover, a primary peripheral nozzle cover, and a secondary peripheral nozzle cover. A plurality of thermocouple conduits are provided and respectively installed on the outer wall of the central nozzle cover and the outer wall of the primary peripheral nozzle cover.

9. The combustion chamber according to claim 8, characterized in that, The tempering thermocouples are dual-armored thermocouples, and each dual-armored thermocouple acquires data from two thermocouples.

10. A gas turbine, characterized in that, Includes the combustion chamber as described in claim 8 or 9.

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