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

Abstract

The invention discloses a double-channel gas turbine combustion chamber flame monitoring light guide structure 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] The present invention relates to the technical field of gas turbine combustion chamber flame monitoring, and particularly to a dual-channel gas turbine combustion chamber flame monitoring light guiding structure. Background Art

[0002] With the continuous improvement of China's energy technology, gas turbines, known as the "pearl on the crown of the equipment manufacturing industry," have gradually achieved domestic research, development, and application. Among them, the domestic application of F-class heavy gas turbines has been implemented and commercially operated in multiple power plants in China. As one of the core components of the equipment, the gas turbine combustion chamber is in a high-temperature and high-pressure environment for a long time, and there are many external interface pipelines for the combustion chamber. There are high requirements for the spatial dimensions of relevant interface pipelines and strict layouts.

[0003] The gas turbine combustion chamber is usually configured with a single-channel flame monitoring light guiding structure with a cooling function for monitoring the flame light in the high-temperature and high-pressure environment of the combustion chamber. With the requirements of the new generation of gas turbines for high-load flexible operation and the improvement of the reliability and stability of gas turbines, the monitoring of the combustion conditions in the combustion chamber will be extended from single flame detection to functions such as flame thermal imaging. Therefore, it is of great significance to arrange multiple flame light guiding channels in the limited space outside the combustion chamber. The multiple flame light guiding channels can meet the needs of equipment at the rear end, such as for guiding light of flame detection optical fibers and for flame light thermal imaging temperature measurement equipment.

[0004] Chinese Patent Document CN214094581U discloses a gas turbine combustion chamber flame detection device, which mainly includes structures such as a light-transmitting glass, a metal flange, and an annular deflector. The flame light in the combustion chamber is transmitted through the light-transmitting glass, and the light-transmitting glass, mounting plate, light source detector, etc. are fixed by the metal flange. At the same time, an uninterrupted cooling medium compressed air is input through the annular deflector structure. This patent adopts a conventional flange sealing structure to seal the optical path channel, and uses compressed air to perform air film protection and cooling on relevant light guiding mechanisms through the annular deflector structure to ensure that the detection angle of the light source amplifier remains unchanged, improve the stability of flame detection, and prevent the system from accidentally triggering the flameout protection. With the development of gas turbine flame monitoring technology and the increase in functions, the number of external interface pipelines for the combustion chamber increases and the space decreases. The flange connection method has the problem of a large installation space for the device, which affects the installation. The compressed air cooling design has the hidden danger of new fault points after the compressed air is cut off without protection.

[0005] Chinese Patent Document CN118499823A discloses an installation structure of a flame detector applicable to a gas turbine, mainly including a combustion assembly and a protection assembly. The combustion assembly mainly includes a combustion device, a detection mechanism on the combustion device, and a flame detector movably connected to one end of the detection mechanism away from the combustion device. An annular cooling cavity is provided inside the combustion device, and the annular cooling cavity conveys cooling gas to the detection mechanism. The protection assembly is located inside the detection mechanism and mainly consists of a protection glass, a lower gasket, and an upper gasket that fit and seal both sides of the protection glass. This patent adopts the scheme of arranging the flame detector near the installation structure. The flame detector is arranged in a high-temperature and high-pressure area and is exposed to a harsh environment for a long time, which may cause a decline in its performance or damage. In addition, the patent uses compressed air in the gas turbine body for cooling. The flow rate and pressure of the compressed air may fluctuate with the operating conditions of the gas turbine, affecting the stability of the cooling effect. And if the compressed air supply of the gas turbine is insufficient (for example, due to equipment failure or load change), the cooling effect will decline, resulting in overheating of the flame detector and posing a potential safety hazard during operation.

[0006] Chinese Patent Document CN102879030A discloses a flame observation device for a gas turbine combustion chamber, including a nut, a gasket, an adapter seat, a cover plate, a floating bushing, a quartz glass, a backing plate, a combustion chamber casing, and a flame tube; the adapter seat is fixed on the combustion chamber casing, the hole on the adapter seat is directly aligned with the opening on the flame tube, the nut fixes the quartz glass and the gasket to the adapter seat, the adapter seat extends from the combustion chamber casing to the backing plate fixed on the flame tube, the lower surface of the adapter seat protrudes from the lower surface of the cover plate but does not extend into the flame tube, the floating bushing can move, and seals are formed through the mating surfaces between the adapter seat and the floating bushing and between the floating bushing and the backing plate, and a gap is ensured between the cover plate and the floating bushing. This patent can be used on test pieces of aeroengine or ground gas turbine combustion chambers. The principle structure is simple, realizing the observation of the flame without allowing additional air to flow into the flame tube and having an adverse impact on the performance of the flame tube itself. In this patent, its seal is achieved through the mating surfaces between the adapter seat and the floating bushing and between the floating bushing and the backing plate, and at the same time, a gap is left between the cover plate and the floating bushing. Although the existence of the gap is used to compensate for thermal expansion, it may also become a weak point of the seal. Especially in a high-temperature and high-pressure environment, the movement of the floating bushing may cause wear of the sealing surface, affecting the long-term sealing performance. And there are no heat insulation measures for the radiant heat of non-flame combustion and no heat transfer and insulation measures for the metal light guide tube of non-flame combustion. The high-temperature radiant heat may cause the temperature of the quartz glass to be too high, accelerating its aging or cracking. In addition, there is only one channel for flame light conduction and no function of expanding the flame light conduction channel. Summary of the Invention

[0007] The object of the present invention is to provide a dual-channel flame monitoring light guiding structure for a gas turbine combustion chamber in view of the deficiencies of the existing light guiding structures for flame monitoring in gas turbine combustion chambers, which can reliably and stably guide the flame light under high temperature and high pressure conditions in the combustion chamber out of the combustion chamber and transmit it to the rear end of the equipment, and at the same time supply it for flame detection and flame thermal imaging applications at the rear end of the equipment, improving the reliability and stability of flame detection and flame thermal imaging of the gas turbine under harsh conditions and ensuring the safe operation of the gas turbine.

[0008] The present invention is realized through the following technical solutions: The present invention provides a dual-channel flame monitoring light guiding structure for a gas turbine combustion chamber, including a connection structure, a heat insulation structure and a light splitting structure; the connection 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 hermetically connected to the temperature and pressure resistant lens assembly; one end of the heat insulation structure is hermetically connected to the temperature and pressure resistant lens assembly, and the other end is hermetically connected to the light splitting structure; the flame light in the gas turbine combustion chamber sequentially passes through the connection structure and the heat insulation structure and is introduced into the light splitting structure, and the light splitting structure divides the full-band flame light into ultraviolet-band flame light and short-wave infrared-band flame light and outputs them.

[0009] As a preferred solution of the present invention, 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, the other end is connected to the light splitting structure, and the heat insulation lens assembly is arranged inside the heat insulation sleeve.

[0010] As a preferred solution of the present invention, the heat insulation sleeve is made of fiberglass material.

[0011] As a preferred solution of the present invention, the light splitting structure includes a first adapter and a dichroic mirror assembly; one end of the first adapter is connected to the heat insulation structure, and the other end has an axial light outlet and a lateral light outlet; the dichroic mirror assembly is arranged inside the first adapter and is used to transmit the ultraviolet light in the full-band flame light to the axial light outlet and reflect the short-wave infrared light to the lateral light outlet.

[0012] As a preferred solution of the present invention, a UV focusing lens assembly is arranged on the axial light outlet of the first adapter.

[0013] As a preferred solution of the present invention, a second adapter is arranged on the lateral light outlet, and a refractive lens assembly is arranged in the second adapter to reflect the short-wave infrared light again to make its light output direction the same as that of the ultraviolet light.

[0014] As a preferred solution of the present invention, a short-wave infrared focusing lens assembly is arranged on the light outlet of the second adapter.

[0015] As a preferred embodiment of the present invention, the front connecting pipe is made of stainless steel material.

[0016] As a preferred embodiment of the present invention, the high-temperature and high-pressure resistant lens assembly is a composite structure of glass and metal.

[0017] As a preferred embodiment of the present invention, the glass is special light-transmitting quartz glass.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects: The light guide structure in the present invention is applied to the flame monitoring of a gas turbine combustion chamber. This structure combines the characteristics of high-temperature and high-pressure resistance, integrated design, and dual-channel output light guide with one optical path divided into two. It can reliably and stably export the flame light under the high-temperature and high-pressure conditions in the combustion chamber and transmit it outside the combustion chamber, and at the same time supply it for flame detection and flame thermal imaging applications at the rear end of the equipment. The present invention is applicable to all F-class heavy gas turbine combustion chamber application scenarios, can improve the reliability and stability of flame detection and flame thermal imaging of gas turbines under harsh conditions, and ensure the safe operation of gas turbines. At the same time, this structure can be downward compatible with the flame light guide of light gas turbine combustion chambers, so as to achieve full coverage of the flame combustion monitoring field of the main gas turbine combustion chambers on the market, which is of great significance for improving the domestic flame combustion monitoring of gas turbine combustion chambers in China. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts. In the drawings: Figure 1 is the optical path schematic diagram of the dual-channel gas turbine combustion chamber flame monitoring light guide structure in the present invention; Figure 2 is the structural schematic diagram of the dual-channel gas turbine combustion chamber flame monitoring light guide structure in the present invention.

[0020] Marks in the drawings and corresponding component names: 1. Front-end connecting pipe, 2. First sealing gasket, 3. Temperature- and pressure-resistant lens assembly, 4. Second sealing gasket, 5. Locking nut, 6. Heat-insulating sleeve, 7. Heat-insulating lens assembly, 8. Third sealing gasket, 9. First adapter, 10. First compression ring, 11. Dichroic mirror assembly, 12. Fourth sealing gasket, 13-1. UV focusing lens assembly, 13-2. Short-wave infrared focusing lens assembly, 14. Second compression ring, 15. Fifth sealing gasket, 16. Refractive lens assembly, 17. Second adapter, 18. Sixth sealing gasket. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in combination with embodiments and the accompanying drawings. The illustrative implementation manners of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0023] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features.

[0024] Referring to "embodiments" herein means that the specific features, structures or characteristics described in combination with the embodiments may be included in at least one embodiment of this application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0025] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: there is A, there is both A and B, and there is B. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0026] In the embodiments of the present application, the same reference numerals denote the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device are only for illustrative purposes and should not constitute any limitation to the present application.

[0027] In the description of the embodiments of the present application, the term "plurality" means two or more (including two). Similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces), unless otherwise specifically and clearly defined.

[0028] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present application.

[0029] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0030] The existing flame light guiding structure of a gas turbine combustor is usually a single-channel structure with a single function, mainly used for detecting the flame combustion state. This kind of light guiding structure has the following deficiencies: 1. The design of the single-channel flame monitoring light guiding structure does not have the function of expanding the optical path channel after adding a detection device, such as adding a flame thermal imaging monitoring function, etc. The existing structure needs to newly open a monitoring hole on the combustor wall and add a light guiding channel device.

[0031] 2. The existing flame monitoring light guiding channel of the combustor mainly uses a flange connection structure to fix and seal related components. The flange sealing structure occupies a large space, which is not conducive to the reasonable layout and utilization of the limited interface space outside the combustor. With the intelligent and digital development of gas turbine combustion technology, the flame monitoring light guiding channel of the combustor will develop in the direction of being small, simple, and reliable.

[0032] In order to overcome the deficiencies of the existing gas turbine combustion chamber flame light guiding technology, the applicant provides a combustion chamber flame monitoring light guiding structure with a temperature and pressure resistant design, a small integrated light guiding channel design, and a one-to-two dual-channel output design for the light path, which is beneficial to improving the flexibility, reliability, and stability of the interface of the gas turbine flame combustion monitoring light guiding output structure, and meeting the intelligent and digital requirements of gas turbine combustion chamber flame monitoring.

[0033] Please refer to Figure 1 and Figure 2 A dual-channel gas turbine combustion chamber flame monitoring light guiding structure provided in an embodiment of the present application includes a connection structure, a heat insulation structure, and a light splitting structure; the connection structure includes a front-end connection pipe 1 and a temperature and pressure resistant lens assembly 3, one end of the front-end connection pipe 1 is connected to the gas turbine combustion chamber in a communicating manner, and the other end is hermetically connected to the temperature and pressure resistant lens assembly 3; one end of the heat insulation structure is hermetically connected to the temperature and pressure resistant lens assembly 3, and the other end is hermetically connected to the light splitting structure; the flame light in the gas turbine combustion chamber sequentially passes through the connection structure and the heat insulation structure and is introduced into the light splitting structure, and the light splitting structure splits the full-band flame light into ultraviolet band flame light and infrared short-wave band flame light for output.

[0034] The front-end connection pipe 1 in the present application is a straight pipe. One end of the front-end connection pipe 1 can be connected to an opening in the wall of the gas turbine combustion chamber by means of a thread, and the other end forms a hermetic connection with the temperature and pressure resistant lens assembly 3, which is mainly used to isolate the high-temperature and high-pressure flue gas at the front end. The front-end connection pipe 1 is made of stainless steel material, which can conduct heat of the gas turbine burner shell initially and reduce the temperature. The flame light in the gas turbine combustion chamber can be introduced into the heat insulation structure through the front-end connection pipe 1 and the temperature and pressure resistant lens assembly 3.

[0035] One end of the heat insulation structure forms a hermetic connection with the temperature and pressure resistant lens assembly 3, and the other end forms a hermetic connection with the light splitting structure. This heat insulation structure is mainly used to isolate the high-temperature radiation heat output by the front-end connection pipe 1, reducing the heat conduction of the connection structure to the light splitting structure, thereby better protecting the optical lenses and the rear detection equipment in the rear light splitting structure.

[0036] According to some embodiments of the present application, the temperature and pressure resistant lens assembly 3 is a composite structure of glass and metal. Preferably, it is composed of glass and metal materials with similar coefficients of thermal expansion (CTE), and reliable sealing is achieved through material selection, surface treatment, and precise process control.

[0037] Specifically, the high temperature and pressure resistant lens assembly 3 includes a metal base and a lens. The metal base is threadedly connected to the front connecting pipe 1. The lens is disposed within the metal base and is centered relative to the front connecting pipe 1. Moreover, a first sealing gasket 2 is provided between the lens and the end face of the front connecting pipe 1 to seal and protect the threaded connection. To allow light to pass through, a through hole is opened in the center of the metal base, and the flame light in the combustion chamber is introduced into the heat insulation structure through the front connecting pipe 1, the lens, and the through hole.

[0038] Compared with the flange sealing connection structure, the threaded sealing connection structure adopted by the front connecting pipe 1 and the high temperature and pressure resistant lens assembly 3 significantly reduces the outer diameter size, effectively saving the piping space outside the gas turbine combustion chamber.

[0039] The main function of the high temperature and pressure resistant lens assembly 3 is to isolate the high temperature and high pressure flue gas at the front end. By adopting a special light-transmitting quartz glass and metal composite design structure, the sealing surface size can be effectively reduced, the sealing performance can be improved, and the flame light can be effectively transmitted while isolating the high temperature and high pressure flue gas at the front end.

[0040] According to some embodiments of the present 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 high temperature and pressure resistant lens assembly 3, and the other end is connected to the spectroscopic structure. The heat insulation lens assembly 7 is disposed within the heat insulation sleeve 6.

[0041] Specifically, one end of the heat insulation sleeve 6 is hermetically connected to the metal base of the high temperature and pressure resistant lens assembly 3 through a locking nut 5 and a second sealing gasket 4, and the other end is hermetically connected to the spectroscopic structure through threads. The heat insulation sleeve 6 and the front connecting pipe 1 are coaxially arranged, and the heat insulation lens assembly 7 is disposed within the heat insulation sleeve 6.

[0042] The above-mentioned heat insulation lens assembly 7 includes a metal base and a lens. The metal base is threadedly connected to the inner wall of the heat insulation sleeve 6. The lens is disposed within the metal base and is centered relative 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 insulation lens assembly 7 is made of a glass material with a low thermal conductivity coefficient, which can further isolate the radiant heat at the front end and protect the lens of the rear spectroscopic structure.

[0043] According to some embodiments of the present application, the heat insulation sleeve 6 is made of fiberglass material. The fiberglass material of the heat insulation sleeve 6 has a low thermal conductivity coefficient, which can effectively isolate the heat conducted by the front connecting metal parts, achieving a good heat insulation effect. Since the front connecting pipe 1 is made of stainless steel, it conducts and cools the heat conducted by the gas turbine burner housing preliminarily. As a supplement to the front connecting pipe 1, the heat insulation sleeve 6 further insulates the high temperature of the front connecting metal parts, effectively reducing the temperature of the device at the rear end of the heat insulation sleeve 6 and ensuring that the device at the rear end operates within a suitable temperature range.

[0044] According to some embodiments of the present 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 the 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 configured 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.

[0045] 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 structure is sealed by a third sealing gasket 8. The first adapter 9 and the heat insulation sleeve 6 are coaxially arranged. The other end of the first adapter 9 has an axial light outlet and a lateral light outlet, where 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.

[0046] The above-mentioned dichroic mirror assembly 11 includes a metal base and a lens. The metal base is fitted to the inner wall of the first adapter 9, and the lens is disposed on the metal base at an inclination of 45° and is opposite to the center of the front connecting tube 1. A through hole for light to pass through is provided at the center of the metal base.

[0047] A first pressing ring 10 is disposed within the first adapter 9. The first pressing ring 10 is located on the side of the metal base of the dichroic mirror assembly 11 close to the heat insulation sleeve 6. The first pressing ring 10 is threadedly connected to the inner wall of the first adapter 9, and the dichroic mirror assembly 11 can be axially pressed and positioned by screwing in the first pressing ring 10.

[0048] According to some embodiments of the present application, a UV focusing lens assembly 13-1 is provided at the axial light outlet of the first adapter 9. The UV focusing lens assembly 13-1 includes a metal base and a lens. The metal base is threadedly connected to the axial light outlet of the first adapter 9 and is sealed by a fourth sealing gasket 12; the lens is disposed within the metal base and is opposite to the center of the front connecting tube 1. A through hole for light to pass through is provided at the center of the metal base.

[0049] According to some embodiments of the present application, a second adapter 17 is provided at the lateral light outlet. A refractive lens assembly 16 is disposed within the second adapter 17 and is configured to reflect the short-wave infrared light again to make its light output direction consistent with that of the ultraviolet light.

[0050] The above-mentioned second adapter 17 may also have a tubular structure. It has a connection interface on its side, and 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 a sixth sealing gasket 18. One end of the second adapter 17 has a light outlet.

[0051] The above-mentioned 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 and positioned as well as sealed through the second compression ring 14 (threadedly connected to the inner wall of the second adapter 17) and the fifth sealing gasket 15. The lens is disposed on the metal base at an angle of 45° and is opposite to the lens center of the dichroic mirror assembly 11.

[0052] According to some embodiments of the present application, a short-wave infrared focusing lens assembly 13-2 is provided at the light outlet of the second adapter 17. The short-wave infrared focusing lens assembly 13-2 includes a metal base and a lens. The metal base is threadedly connected to the light outlet of the second adapter 17 and is sealed through the fourth sealing gasket 12. The lens is disposed within the metal base and is opposite to the lens center of the refractive lens assembly 16, and a through hole for light to pass through is formed at the center of the metal base.

[0053] In the present application, the optical path direction of the flame light in the gas turbine combustion chamber is as follows: The full-band flame light passes through the high-temperature and high-pressure resistant lens assembly 3 to isolate the high-temperature and high-pressure gas medium. Further, the flame light is thermally insulated through the heat-insulating lens assembly 7. Further, the optical path is split into two by the dichroic mirror assembly 11. The ultraviolet-band flame light is transmitted to the ultraviolet focusing lens assembly 13-1, and the short-wave infrared-band flame light is reflected by 90° to the refractive lens assembly 16 and then reflected by 90° again to the short-wave infrared focusing lens assembly 13-2.

[0054] The dichroic mirror assembly 11 is a short-wave pass dichroic mirror. Filter films and antireflection films are deposited on both sides of the lens. The lens is arranged at an angle of 45°. The lens highly transmits the ultraviolet light with a wavelength band lower than 550 nm and focuses it to the ultraviolet flame light guiding optical fiber through the ultraviolet focusing lens assembly 13-1, and then transmits it to the rear-end ultraviolet flame detector for flame detection and judgment. The short-wave infrared light with a wavelength band higher than 550 nm is reflected to the refractive lens assembly 16, and after being reflected again by the refractive lens assembly 16 to the short-wave infrared focusing lens assembly 13-2, it is output to the thermal imaging camera through the rear-end short-wave infrared thermal imaging detection device and the thermal imaging temperature measurement information of the flame in the combustion chamber is displayed.

[0055] Compared with the prior art, the main advantages of the present invention are as follows: 1. It can simultaneously monitor the dual-channel signals of the flame light detection and the flame light thermal imaging in the gas turbine combustion chamber.

[0056] This light guide structure adopts a dual-channel light guide structure design, which is suitable for the high-temperature and high-pressure flame light medium inside the gas turbine combustion chamber and the high-temperature working environment outside the combustion chamber. The structure uses a short-wave pass dichroic mirror composite 11 to highly transmit ultraviolet light with a wavelength below 550 nm, and then focus it onto the ultraviolet flame light guide optical fiber through the ultraviolet focusing lens composite 13-1, and transmit it to the rear-end ultraviolet flame detector for flame detection and judgment. The short-wave infrared light with a wavelength above 550 nm is reflected to the refractive lens composite 16, and then reflected again by the refractive lens composite 16 and focused by the short-wave infrared focusing lens composite 13-2, and then output to the thermal imaging camera through the rear-end infrared short-wave thermal imaging detection device to display the flame thermal imaging temperature measurement information inside the combustion chamber. This structure integrates the functions of flame detection and flame thermal imaging temperature measurement. Through dual detection, it significantly improves the accuracy and reliability of the combustion condition monitoring of the combustion chamber. At the same time, it can quickly respond to the changes in the flame state, provide comprehensive flame combustion information under complex working conditions, and ensure the safe operation of the gas turbine. The dual-channel optical path structure is simple, realizes dual functions, does not require additional equipment, saves space and reduces costs.

[0057] 2. The compact and miniaturized structure design is more suitable for the gas turbine combustion chamber with limited installation space.

[0058] Through the compact and miniaturized design, this structure fully considers the limitations of the external space of the gas turbine combustion chamber. The designed outer diameter of the front-end connecting pipe 1 of the structure is ≤45 mm, which can be perfectly adapted to the narrow installation environment while ensuring that the flame detection and thermal imaging detection performance are not affected. This structure cancels the cooling air cooling structure of the traditional single-channel light guide device, further reducing the size of the device. This structure adopts the design of temperature-resistant and pressure-resistant glass, heat-insulating sleeve 6, etc., improving the temperature-resistant and pressure-resistant performance of the structure in the high-temperature and high-pressure environment and ensuring the safety of the structure during operation. This structure significantly reduces the requirement of the gas turbine combustion chamber equipment for the installation space of the light guide structure and is suitable for the application scenario of the gas turbine combustion chamber with limited space.

[0059] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

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

2. The light guide structure for flame monitoring of the dual-channel gas turbine combustor 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 heat-resistant and pressure-resistant lens assembly, the other end is connected to the beam splitting structure, and the heat insulation lens assembly is arranged inside the heat insulation sleeve.

3. The light guiding structure for flame monitoring of the dual-channel gas turbine combustor according to claim 2, characterized in that, The heat insulation sleeve is made of fiberglass material.

4. The light guiding structure for flame monitoring of the dual-channel gas turbine combustor 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 the heat insulation structure, and the other end has an axial light outlet and a lateral light outlet; the dichroic mirror assembly is arranged inside the first adapter and is used to transmit the ultraviolet light in the full-band flame light to the axial light outlet and reflect the short-wave infrared light to the lateral light outlet.

5. The light guiding structure for flame monitoring of the dual-channel gas turbine combustor according to claim 4, characterized in that, A UV focusing lens assembly is arranged at the axial light outlet of the first adapter.

6. The light guiding structure for flame monitoring of the dual-channel gas turbine combustor according to claim 4, characterized in that, A second adapter is arranged at the lateral light outlet, and a refractive lens assembly is arranged in the second adapter to reflect the short-wave infrared light again to make its light output direction the same as that of the ultraviolet light.

7. The light guiding structure for flame monitoring of the dual-channel gas turbine combustor according to claim 6, characterized in that, A short-wave infrared focusing lens assembly is arranged at the light outlet of the second adapter.

8. The light guiding structure for flame monitoring of a dual-channel gas turbine combustor according to any one of claims 1 to 3, characterized in that, The front-end connection pipe is made of stainless steel material.

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

10. The light guide structure for flame monitoring of the dual-channel gas turbine combustor according to claim 9, characterized in that, The glass is special light-transmitting quartz glass.

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