Double-channel gas turbine combustion chamber flame monitoring light guide device

Abstract

The utility model discloses a double-channel gas turbine combustion chamber flame monitoring light guide device which comprises a connecting structure, a heat insulation structure and a light splitting structure. The connecting structure comprises a front-end connecting pipe and a temperature-resistant and pressure-resistant lens synthesis piece, one end of the front-end connecting pipe is communicated with the combustion chamber of the gas turbine, and the other end of the front-end connecting pipe is hermetically connected with the temperature-resistant and pressure-resistant lens synthesis piece; one end of the heat insulation structure is hermetically connected with the temperature-resistant and pressure-resistant lens assembly, and the other end is hermetically connected with the light splitting structure; flame light in a combustion chamber of the gas turbine is guided into the light splitting structure through the connecting structure and the heat insulation structure in sequence, and the full-wave-band flame light is split into ultraviolet-wave-band flame light and infrared-short-wave-band flame light through the light splitting structure to be output. The light guide structure can reliably and stably guide the flame in the combustion chamber out and transmit the flame to the outside of the combustion chamber for flame detection and flame thermal imaging at the rear end of equipment, so that the reliability and stability of flame detection and flame thermal imaging of the gas turbine are improved, and the safe operation of the gas turbine is ensured.

Description

Technical Field

[0001] This utility model relates to the field of gas turbine combustion chamber flame monitoring technology, specifically to a dual-channel gas turbine combustion chamber flame monitoring light guide device. Background Technology

[0002] With the continuous improvement of my country's energy technology, gas turbines, hailed as the "crown jewel" of the equipment manufacturing industry, have gradually achieved domestic research and development and application. Among them, the domestic application of F-class heavy-duty gas turbines has been implemented and is in commercial operation in multiple power plants in China. As one of the core components of the equipment, the gas turbine combustion chamber is subjected to high temperature and high pressure environment for a long time. Moreover, the combustion chamber has many interface pipes with the outside, which places high demands on the space dimensions of the relevant interface pipes and strict layout requirements.

[0003] Gas turbine combustors typically feature a single-channel flame monitoring light guide structure with cooling function for flame light monitoring in the high-temperature and high-pressure environment within the combustor. With the increasing demands for high-load and flexible operation of next-generation gas turbines, and the improvement in their reliability and stability, the monitoring of combustion conditions in the combustor will expand from simple flame detection to functions such as flame thermal imaging. Therefore, it is of great significance to arrange multiple flame light guide channels within the limited space outside the combustor. Multiple flame light guide channels can meet the needs of downstream equipment such as flame detection fiber optic guidance and flame photothermal imaging temperature measurement equipment.

[0004] Chinese patent document CN214094581U discloses a flame detection device for a gas turbine combustion chamber, mainly comprising a transparent glass, a metal flange, and an annular guide plate. The transparent glass transmits flame light from the combustion chamber, and the metal flange secures the transparent glass, mounting plate, and light source detector. Simultaneously, the annular guide plate structure provides a continuous supply of compressed air as cooling. This patent employs a conventional flange sealing structure to seal the light path channel, and uses compressed air through the annular guide plate structure to provide gas film protection and cooling for the relevant light guiding mechanisms, ensuring a constant detection angle for the light source amplifier, improving the stability of flame detection, and preventing the system from falsely triggering flameout protection. With the development of gas turbine flame monitoring technology and the increase in functionality, the number of combustion chamber interface pipes has increased, and space has decreased. Using flange connections results in a large installation space, affecting installation. The compressed air cooling design poses a potential risk of creating new fault points if compressed air supply is interrupted without protection.

[0005] Chinese patent document CN118499823A discloses a flame detector mounting structure suitable for gas turbines, mainly comprising a combustion assembly and a protective assembly. The combustion assembly mainly includes a combustion device, a detection mechanism on the combustion device, and a flame detector movably connected to the end of the detection mechanism furthest from the combustion device. An annular cooling chamber is provided inside the combustion device, supplying cooling gas to the detection mechanism. The protective assembly is located inside the detection mechanism and mainly consists of protective glass, and lower and upper sealing gaskets that seal the sides of the protective glass. This patent adopts a scheme where the flame detector is placed near the mounting structure. The flame detector is placed in a high-temperature, high-pressure area, and long-term exposure to harsh environments may lead to performance degradation or damage. Furthermore, the patent uses compressed air from the gas turbine itself for cooling. The flow rate and pressure of the compressed air may fluctuate with changes in the gas turbine's operating conditions, affecting the stability of the cooling effect. Moreover, if the compressed air supply to the gas turbine is insufficient (e.g., due to equipment failure or load changes), the cooling effect will decrease, leading to overheating of the flame detector and posing a safety hazard.

[0006] Chinese patent document CN102879030A discloses a flame observation device for a gas turbine combustor, including a nut, a sealing gasket, an adapter, a cover plate, a floating bushing, quartz glass, a pad plate, a combustor housing, and a flame tube. The adapter is fixed to the combustor housing, with a hole on the adapter directly aligned with an opening on the flame tube. The nut secures the quartz glass and the sealing gasket to the adapter. The adapter extends from the combustor housing to the pad plate fixed to the flame tube. The lower surface of the adapter protrudes from the lower surface of the cover plate but does not extend into the flame tube. The floating bushing is movable, forming a seal through the mating surfaces between the adapter and the floating bushing, and between the floating bushing and the pad plate, while maintaining a gap between the cover plate and the floating bushing. This patent can be used on test specimens of combustors for aero-engines or ground-based gas turbines. Its simple principle and structure enable flame observation without allowing additional air to flow into the flame tube, thus preventing adverse effects on the flame tube's performance. In this patent, the seal is achieved through the mating surfaces between the adapter and the floating bushing, and between the floating bushing and the gasket, while a gap remains between the cover plate and the floating bushing. While this gap is intended to compensate for thermal expansion, it can also become a weak point in the seal, especially under high temperature and high pressure conditions. The movement of the floating bushing can cause wear on the sealing surface, affecting long-term sealing performance. Furthermore, there are no heat insulation measures for the radiant heat of flame combustion, nor are there any heat insulation measures for the metal heat transfer of the flame-conducting light guide. High-temperature radiant heat may cause the quartz glass to overheat, accelerating its aging or cracking. Additionally, the flame light conduction has only one channel and lacks the function of extending the flame light conduction channel. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing flame monitoring light guide structures for gas turbine combustion chambers by providing a dual-channel flame monitoring light guide device for gas turbine combustion chambers. This device can reliably and stably guide and transmit the flame light from the high-temperature and high-pressure conditions inside the combustion chamber to the outside of the combustion chamber, while simultaneously providing it for flame detection and flame thermal imaging applications at the back end of the equipment. This improves the reliability and stability of flame detection and flame thermal imaging of gas turbines under harsh operating conditions, ensuring the safe operation of gas turbines.

[0008] This utility model is achieved through the following technical solution:

[0009] This utility model provides a dual-channel gas turbine combustion chamber flame monitoring light guiding device, including a connecting structure, a heat insulation structure, and a beam splitting structure. The connecting structure includes a front-end connecting pipe and a temperature- and pressure-resistant lens assembly. One end of the front-end connecting pipe is connected to the gas turbine combustion chamber, and the other end is sealed to the temperature- and pressure-resistant lens assembly. One end of the heat insulation structure is sealed to the temperature- and pressure-resistant lens assembly, and the other end is sealed to the beam splitting structure. The flame light in the gas turbine combustion chamber is sequentially guided into the beam splitting structure through the connecting structure and the heat insulation structure, and the beam splitting structure divides the full-band flame light into ultraviolet flame light and infrared short-wave flame light for output.

[0010] As a preferred embodiment of this utility model, the heat insulation structure includes a heat insulation sleeve and a heat insulation lens assembly. One end of the heat insulation sleeve is connected to the temperature and pressure resistant lens assembly, and the other end is connected to the beam splitting structure. The heat insulation lens assembly is disposed inside the heat insulation sleeve.

[0011] As a preferred embodiment of this utility model, the heat insulation sleeve is made of fiberglass material.

[0012] As a preferred embodiment of this utility model, the beam-splitting structure includes a first adapter and a dichroic mirror assembly; one end of the first adapter is connected to a heat insulation structure, and the other end has an axial light-emitting port and a lateral light-emitting port; the dichroic mirror assembly is disposed within the first adapter and is used to transmit ultraviolet light in the full-band flame light to the axial light-emitting port and reflect short-wave infrared light to the lateral light-emitting port.

[0013] As a preferred embodiment of this utility model, an ultraviolet focusing lens assembly is provided on the axial light outlet of the first adapter.

[0014] As a preferred embodiment of this utility model, a second adapter is provided on the side light outlet, and the second adapter is provided with a refractive lens assembly for reflecting short-wave infrared light again so that it is aligned with the ultraviolet light emission direction.

[0015] As a preferred embodiment of this utility model, a short-wave infrared focusing lens assembly is provided on the light outlet of the second adapter.

[0016] As a preferred embodiment of this utility model, the front-end connecting pipe is made of stainless steel.

[0017] As a preferred embodiment of this utility model, the temperature- and pressure-resistant lens composite is a composite structure of glass and metal.

[0018] As a preferred embodiment of this utility model, the glass is a special light-transmitting quartz glass.

[0019] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0020] The light-guiding structure of this invention is applied to flame monitoring in gas turbine combustors. This structure combines features such as temperature and pressure resistance, integrated design, and a dual-channel output light guide with a one-to-two optical path. It reliably and stably guides and transmits the flame light from the high-temperature, high-pressure conditions inside the combustor to the outside, simultaneously supplying the equipment for flame detection and thermal imaging applications at the back end. This invention is applicable to all F-class heavy-duty gas turbine combustor applications, improving the reliability and stability of flame detection and thermal imaging under harsh conditions, ensuring the safe operation of the gas turbine. Furthermore, this structure is backward compatible with flame guiding in light-duty gas turbine combustors, thus achieving full coverage of the main gas turbine combustor flame monitoring applications on the market. This is of great significance for improving the domestic production of gas turbine combustor flame monitoring technology in my country. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the exemplary embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0022] Figure 1 This is a schematic diagram of the optical path of the dual-channel gas turbine combustion chamber flame monitoring light guide device in this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the dual-channel gas turbine combustion chamber flame monitoring light guide device in this utility model.

[0024] The attached diagram shows the markings and corresponding component names:

[0025] 1. Front connecting pipe; 2. First sealing gasket; 3. Temperature and pressure resistant lens assembly; 4. Second sealing gasket; 5. Locking nut; 6. Heat insulation sleeve; 7. Heat insulation lens assembly; 8. Third sealing gasket; 9. First adapter; 10. First clamping ring; 11. Dichroic mirror assembly; 12. Fourth sealing gasket; 13-1. Ultraviolet focusing lens assembly; 13-2. Short-wave infrared focusing lens assembly; 14. Second clamping ring; 15. Fifth sealing gasket; 16. Refractive lens assembly; 17. Second adapter; 18. Sixth sealing gasket. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0028] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0031] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0032] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces), unless otherwise explicitly specified.

[0033] In the description of the embodiments of this application, the technical 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 only for the convenience of describing the embodiments of this application 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 the embodiments of this application.

[0034] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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 or an electrical connection; 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0035] Existing flame guiding structures in gas turbine combustors are typically single-channel structures with limited functionality, primarily used for flame combustion status detection. These structures suffer from the following drawbacks:

[0036] 1. The existing single-channel flame monitoring light guide structure design does not support the expansion of the optical path channel after adding new detection devices, such as adding flame thermal imaging monitoring functions. The existing structure requires new monitoring holes and new light guide channel devices to be opened on the combustion chamber wall.

[0037] 2. Existing combustion chamber flame monitoring light guide channels primarily use flange connections to fix and seal related components. Flange sealing structures occupy a significant amount of space, which is detrimental to the rational layout and utilization of the limited external interface space of the combustion chamber. With the intelligent and digital development of gas turbine combustion technology, combustion chamber flame monitoring light guide channels will evolve towards smaller, simpler, and more reliable designs.

[0038] To overcome the shortcomings of existing gas turbine combustor flame guiding technology, the applicant provides a combustor flame monitoring light guide structure with temperature and pressure resistant design, small integrated light guide channel design, and dual-channel output design with one-to-two optical path. This structure is conducive to improving the flexibility, reliability, and stability of the output structure interface for gas turbine flame combustion monitoring, and meets the intelligent and digital requirements of gas turbine combustor flame monitoring.

[0039] Please refer to Figure 1 and Figure 2 This application provides a dual-channel gas turbine combustor flame monitoring light guide device, comprising a connecting structure, a heat insulation structure, and a beam splitting structure. The connecting structure includes a front-end connecting pipe 1 and a temperature- and pressure-resistant lens composite 3. One end of the front-end connecting pipe 1 is connected to the gas turbine combustor, and the other end is sealed to the temperature- and pressure-resistant lens composite 3. One end of the heat insulation structure is sealed to the temperature- and pressure-resistant lens composite 3, and the other end is sealed to the beam splitting structure. The flame light in the gas turbine combustor is sequentially guided into the beam splitting structure through the connecting structure and the heat insulation structure, and the beam splitting structure divides the full-band flame light into ultraviolet flame light and infrared short-wave flame light for output.

[0040] The front-end connecting pipe 1 in this application is a straight pipe. One end of the front-end connecting pipe 1 can be threaded into an opening in the combustion chamber wall of the gas turbine, and the other end forms a sealed connection with the temperature-resistant and pressure-resistant lens composite 3, mainly used to isolate the high-temperature and high-pressure flue gas at the front end. The front-end connecting pipe 1 is made of stainless steel, which can provide preliminary metal heat conduction and cooling for the heat conducted through the gas turbine burner shell. The flame light in the gas turbine combustion chamber can be guided into the heat insulation structure through the front-end connecting pipe 1 and the temperature-resistant and pressure-resistant lens composite 3.

[0041] One end of the heat insulation structure forms a sealed connection with the temperature and pressure resistant lens composite 3, and the other end forms a sealed connection with the beam splitting structure. This heat insulation structure is mainly used to isolate the high-temperature radiant heat output from the front-end connecting pipe 1, reducing the heat conduction of the connecting structure to the beam splitting structure, thereby better protecting the optical lenses and back-end testing equipment in the back-end beam splitting structure.

[0042] According to some embodiments of this application, the temperature- and pressure-resistant lens composite 3 is a composite structure of glass and metal. Preferably, it is made of glass and metal materials with similar coefficients of thermal expansion (CTE), and reliable sealing is achieved through material selection, surface treatment, and precision process control.

[0043] Specifically, the temperature- and pressure-resistant lens assembly 3 includes a metal base and a lens. The metal base is threadedly connected to the front-end connecting pipe 1, and the lens is disposed within the metal base and centered on the front-end connecting pipe 1. A first sealing gasket 2 seals and protects the threaded connection between the lens and the end face of the front-end connecting pipe 1. To allow light to pass through, a through hole is provided in the center of the metal base, through which flame light from the combustion chamber is guided into the heat insulation structure via the front-end connecting pipe 1, the lens, and the through hole.

[0044] The front-end connecting pipe 1 and the temperature and pressure resistant lens composite 3 adopt a threaded sealing connection structure, which significantly reduces the outer diameter compared to the flange sealing connection structure, effectively saving the external piping space of the gas turbine combustion chamber.

[0045] The main function of the temperature and pressure resistant lens composite component 3 is to isolate the high-temperature and high-pressure flue gas at the front end. It adopts a special light-transmitting quartz glass and metal composite design structure, which can effectively reduce the size of the sealing surface and improve the sealing performance. While isolating the high-temperature and high-pressure flue gas at the front end, it can effectively transmit the flame light.

[0046] According to some embodiments of this application, the heat insulation structure includes a heat insulation sleeve 6 and a heat insulation lens assembly 7. One end of the heat insulation sleeve 6 is connected to the temperature and pressure resistant lens assembly 3, and the other end is connected to the beam splitting structure. The heat insulation lens assembly 7 is disposed inside the heat insulation sleeve 6.

[0047] Specifically, one end of the heat insulation sleeve 6 is sealed to the metal base of the temperature and pressure resistant lens assembly 3 via a locking nut 5 and a second sealing gasket 4, while the other end is sealed to the beam splitting structure via a thread. The heat insulation sleeve 6 and the front connecting pipe 1 are arranged coaxially, and the heat insulation lens assembly 7 is disposed inside the heat insulation sleeve 6.

[0048] The aforementioned heat-insulating lens assembly 7 includes a metal base and a lens. The metal base is threadedly connected to the inner wall of the heat-insulating sleeve 6, and the lens is disposed inside the metal base and centered opposite to the front connecting pipe 1. A through hole for light to pass through is opened in the center of the metal base. The lens of the heat-insulating lens assembly 7 is made of glass material with low thermal conductivity, which can further isolate the front-end radiated heat and protect the lens of the rear beam-splitting structure.

[0049] According to some embodiments of this application, the heat insulation sleeve 6 is made of fiberglass. The low thermal conductivity of fiberglass sleeve 6 effectively isolates the heat conducted by the front-end connecting metal parts, achieving a good heat insulation effect. Since the front-end connecting pipe 1 is made of stainless steel, it provides initial metal heat conduction and cooling for the gas turbine burner shell. The heat insulation sleeve 6, as a supplement to the front-end connecting pipe 1, further insulates the high temperature of the front-end connecting metal parts, effectively reducing the temperature of the rear-end device and ensuring that the rear-end device operates within a suitable temperature range.

[0050] According to some embodiments of this application, the beam splitting structure includes a first adapter 9 and a dichroic mirror assembly 11; one end of the first adapter 9 is connected to a heat insulation structure, and the other end has an axial light outlet and a lateral light outlet; the dichroic mirror assembly 11 is disposed within the first adapter 9 and is used to transmit ultraviolet light in the full-band flame light to the axial light outlet and reflect short-wave infrared light to the lateral light outlet.

[0051] Specifically, the first adapter 9 has a tubular structure. One end of the first adapter 9 is threadedly connected to one end of the heat insulation sleeve 6, and the threaded connection is sealed by the third sealing gasket 8. The first adapter 9 and the heat insulation sleeve 6 are arranged coaxially. The other end of the first adapter 9 has an axial light outlet and a lateral light outlet, wherein the axial light outlet is located at the center of the first adapter 9, and the lateral light outlet is located on the side wall of the first adapter 9.

[0052] The aforementioned dichroic mirror assembly 11 includes a metal base and a lens. The metal base is fitted into the inner wall of the first adapter 9, and the lens is tilted at 45° and disposed on the metal base, facing the center of the front connecting tube 1. A through hole for light to pass through is opened in the center of the metal base.

[0053] The first adapter 9 is provided with a first clamping ring 10. The first clamping ring 10 is located on the side of the metal base of the dichroic mirror composite 11 near the heat insulation sleeve 6. The first clamping ring 10 is threaded to the inner wall of the first adapter 9. The dichroic mirror composite 11 can be axially clamped and positioned by screwing in the first clamping ring 10.

[0054] According to some embodiments of this application, an ultraviolet focusing lens assembly 13-1 is provided on the axial light outlet of the first adapter 9. The ultraviolet focusing lens assembly 13-1 includes a metal base and a lens, wherein the metal base is threadedly connected to the axial light outlet of the first adapter 9 and sealed by a fourth sealing gasket 12; the lens is disposed in the metal base and is centered opposite to the front connecting tube 1, and a through hole for light to pass through is opened in the center of the metal base.

[0055] According to some embodiments of this application, a second adapter 17 is provided on the side light outlet, and a refractive lens composite 16 is provided in the second adapter 17 for reflecting short-wave infrared light again so that it is consistent with the direction of ultraviolet light emission.

[0056] The second adapter 17 described above can also be a tubular structure with a connection interface on its side. It is threadedly connected to the lateral light outlet of the first adapter 9 through this connection interface, and the threaded connection structure is sealed by the sixth sealing gasket 18. One end of the second adapter 17 has a light outlet.

[0057] The aforementioned refractive lens assembly 16 includes a metal base and a lens. The metal base is fitted to the inner wall of the second adapter 17 and is axially pressed, positioned, and sealed by the second clamping ring 14 (threaded to the inner wall of the second adapter 17) and the fifth sealing gasket 15. The lens is tilted at 45° on the metal base and is opposite to the center of the lens of the dichroic mirror assembly 11.

[0058] According to some embodiments of this application, a short-wave infrared focusing lens assembly 13-2 is provided on the light outlet of the second adapter 17. The short-wave infrared focusing lens assembly 13-2 includes a metal base and a lens, wherein the metal base is threadedly connected to the light outlet of the second adapter 17 and sealed by a fourth sealing gasket 12; the lens is disposed in the metal base and is opposite to the center of the lens of the refractive lens assembly 16, and a through hole for light to pass through is opened in the center of the metal base.

[0059] In this application, the optical path of the flame in the gas turbine combustion chamber is as follows: the full-band flame light passes through the temperature- and pressure-resistant lens assembly 3, isolating it from the high-temperature and high-pressure gas medium. Furthermore, the flame light is heat-insulated by the heat-insulating lens assembly 7. Further, the optical path is split in two by the dichroic mirror assembly 11: the ultraviolet flame light is transmitted to the ultraviolet focusing lens assembly 13-1, and the infrared short-wave flame light is reflected 90° to the refractive lens assembly 16, and then reflected again 90° to the short-wave infrared focusing lens assembly 13-2.

[0060] Dichroic mirror assembly 11 is a short-pass dichroic mirror. Both sides of the mirror are coated with a filter film and an anti-reflection film. The mirror is arranged at a 45° angle. The mirror transmits ultraviolet light below 550nm with high transmittance, which is then focused by ultraviolet focusing lens assembly 13-1 onto the ultraviolet flame light guide fiber and transmitted to the downstream ultraviolet flame detector for flame detection and judgment. Short-wave infrared light above 550nm is reflected to refractive lens assembly 16, and then reflected again by refractive lens assembly 16 to short-wave infrared focusing lens assembly 13-2. The light is then output to the thermal imaging camera via the downstream infrared short-wave thermal imaging detection device, displaying the thermal imaging temperature information of the flame inside the combustion chamber.

[0061] Compared with the prior art, the main advantages of this utility model are:

[0062] 1. It can realize the simultaneous monitoring of dual-channel signals of flame light detection and flame photothermal imaging in the combustion chamber of gas turbines.

[0063] This light guide structure employs a dual-channel design, adaptable to the high-temperature, high-pressure flame light medium inside the gas turbine combustion chamber and the high-temperature operating environment outside the combustion chamber. The structure utilizes a short-wavelength dichroic mirror composite element 11 to highly transmit ultraviolet light below 550nm, which is then focused by an ultraviolet focusing lens composite element 13-1 onto the ultraviolet flame light guide fiber and transmitted to the downstream ultraviolet flame detector for flame detection and judgment. Short-wavelength infrared light above 550nm is reflected by a refractive lens composite element 16, and then reflected again by the refractive lens composite element 16 to a short-wavelength infrared focusing lens composite element 13-2, before being output to a thermal imaging camera via a downstream infrared short-wavelength thermal imaging detection device, displaying the flame thermal imaging temperature information inside the combustion chamber. This structure integrates flame detection and flame thermal imaging temperature measurement functions. Through dual detection, it significantly improves the accuracy and reliability of combustion condition monitoring in the combustion chamber, while also enabling rapid response to changes in flame state, providing comprehensive flame combustion information under complex operating conditions, and ensuring the safe operation of the gas turbine. The dual-channel optical path structure is simple, achieves dual functions, requires no additional equipment, saves space and reduces costs.

[0064] 2. The compact and miniaturized structural design is more suitable for gas turbine combustion chambers with limited installation space.

[0065] This structure, through its compact and miniaturized design, fully considers the limitations of the external space of the gas turbine combustor. The outer diameter of the front connecting pipe 1 is designed to be ≤45mm, allowing for perfect adaptation in confined installation environments while ensuring that flame detection and thermal imaging performance are not affected. This structure eliminates the cooling air structure of traditional single-channel light guide devices, further reducing the device size. The use of temperature- and pressure-resistant glass and heat-insulating sleeves 6 improves the structure's temperature and pressure resistance under high-temperature and high-pressure environments, ensuring the safety of structural operation. This structure significantly reduces the installation space requirements of the light guide structure in gas turbine combustor equipment, making it suitable for space-constrained gas turbine combustor applications.

[0066] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A dual-channel gas turbine combustion chamber flame monitoring light guide device, characterized in that, It includes a connecting structure, a heat insulation structure, and a beam splitting structure. The connecting structure includes a front-end connecting pipe and a temperature- and pressure-resistant lens assembly. One end of the front-end connecting pipe is connected to the combustion chamber of the gas turbine, and the other end is sealed to the temperature- and pressure-resistant lens assembly. One end of the heat insulation structure is sealed to the temperature- and pressure-resistant lens assembly, and the other end is sealed to the beam splitting structure. The flame light in the combustion chamber of the gas turbine is sequentially introduced into the beam splitting structure through the connecting structure and the heat insulation structure, and the beam splitting structure splits the full-band flame light into ultraviolet flame light and infrared short-wave flame light for output.

2. The dual-channel gas turbine combustion chamber flame monitoring light guide device according to claim 1, characterized in that, The heat insulation structure includes a heat insulation sleeve and a heat insulation lens assembly. One end of the heat insulation sleeve is connected to the temperature and pressure resistant lens assembly, and the other end is connected to the beam splitting structure. The heat insulation lens assembly is disposed inside the heat insulation sleeve.

3. The dual-channel gas turbine combustion chamber flame monitoring light guide device according to claim 2, characterized in that, The heat insulation sleeve is made of fiberglass.

4. The dual-channel gas turbine combustion chamber flame monitoring light guide device according to any one of claims 1-3, characterized in that, The beam-splitting structure includes a first adapter and a dichroic mirror assembly; one end of the first adapter is connected to a heat insulation structure, and the other end has an axial light-emitting port and a lateral light-emitting port; the dichroic mirror assembly is disposed within the first adapter and is used to transmit ultraviolet light in the full-band flame light to the axial light-emitting port and reflect short-wave infrared light to the lateral light-emitting port.

5. The dual-channel gas turbine combustion chamber flame monitoring light guide device according to claim 4, characterized in that, An ultraviolet focusing lens assembly is provided on the axial light outlet of the first adapter.

6. The dual-channel gas turbine combustion chamber flame monitoring light guide device according to claim 4, characterized in that, A second adapter is provided on the side light outlet, and the second adapter is provided with a refractive lens assembly for reflecting short-wave infrared light again so that it is aligned with the direction of ultraviolet light emission.

7. The dual-channel gas turbine combustion chamber flame monitoring light guide device according to claim 6, characterized in that, The second adapter has a short-wave infrared focusing lens assembly on its light output port.

8. The dual-channel gas turbine combustion chamber flame monitoring light guide device according to any one of claims 1-3, characterized in that, The front-end connecting pipe is made of stainless steel.

9. The dual-channel gas turbine combustion chamber flame monitoring light guide device according to any one of claims 1-3, characterized in that, The temperature- and pressure-resistant lens assembly is a composite structure of glass and metal.

10. The dual-channel gas turbine combustion chamber flame monitoring light guide device according to claim 9, characterized in that, The glass is a special type of light-transmitting quartz glass.

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