CN-224230050-U - Dual-channel gas turbine combustion chamber flame monitoring light guide device

CN224230050UCN 224230050 UCN224230050 UCN 224230050UCN-224230050-U

Abstract

The utility model discloses a flame monitoring and light guiding device of a dual-channel gas turbine combustion chamber, which comprises a connecting structure, a heat insulation structure and a light splitting structure, wherein the connecting structure comprises a front end connecting pipe and a temperature and pressure resistant lens composite part, one end of the front end connecting pipe is communicated with the gas turbine combustion chamber, the other end of the front end connecting pipe is in sealing connection with the temperature and pressure resistant lens composite part, one end of the heat insulation structure is in sealing connection with the temperature and pressure resistant lens composite part, the other end of the heat insulation structure is in sealing connection with the light splitting structure, flame light in the gas turbine combustion chamber is led into the light splitting structure through the connecting structure and the heat insulation structure in sequence, and the light splitting structure divides full-wave flame light into ultraviolet-wave-band flame light and infrared short-wave-band flame light to be output. The light guide structure can reliably and stably guide out flame light in the combustion chamber and transmit the flame light out of the combustion chamber, and meanwhile, the light guide structure is used 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.

Inventors

XIAO XIANYONG
ZHONG BIN
YANG QINGFENG
LIU YANTAO
ZHENG HANQI
LI YOUHENG
CHENG XIAOFEI
WU ZHIFANG
YI LONG
LU ZHENCHAO
LEI YANHUI

Assignees

东方电气启能(深圳)科技有限公司
东方电气自动控制工程有限公司

Dates

Publication Date: 20260512
Application Date: 20250529

Claims (10)

1. A flame monitoring and light guiding device of a dual-channel gas turbine combustion chamber is characterized by comprising a connecting structure, a heat insulation structure and a light splitting structure, wherein the connecting structure comprises a front end connecting pipe and a temperature and pressure resistant lens composite part, one end of the front end connecting pipe is communicated with the gas turbine combustion chamber, the other end of the front end connecting pipe is in sealing connection with the temperature and pressure resistant lens composite part, one end of the heat insulation structure is in sealing connection with the temperature and pressure resistant lens composite part, the other end of the heat insulation structure is in sealing connection with the light splitting structure, flame light in the gas turbine combustion chamber is led into the light splitting structure through the connecting structure and the heat insulation structure in sequence, and the light splitting structure divides full-wave flame light into ultraviolet-wave-band flame light and infrared short-wave-band flame light to be output.
2. The dual channel gas turbine combustor flame monitoring light guide of claim 1, wherein the insulating structure comprises an insulating sleeve and an insulating lens composite, one end of the insulating sleeve is connected to the temperature and pressure resistant lens composite, the other end is connected to the light splitting structure, and the insulating lens composite is disposed in the insulating sleeve.
3. The dual channel gas turbine combustor flame monitoring light guide of claim 2, wherein the insulating sleeve is made of glass fiber reinforced plastic material.
4. The dual-channel gas turbine combustor flame monitoring and light guiding device according to any one of claims 1-3, wherein the light splitting structure comprises a first adapter and a dichroic mirror composite piece, one end of the first adapter is connected with the heat insulation structure, the other end of the first adapter is provided with an axial light outlet and a lateral light outlet, and the dichroic mirror composite piece is arranged in the first adapter and is used for enabling ultraviolet light in full-wave flame light to be transmitted to the axial light outlet and short-wave infrared light to be reflected to the lateral light outlet.
5. The dual channel gas turbine combustor flame monitoring light guide of claim 4, wherein an ultraviolet focusing lens assembly is disposed on the axial light outlet of the first adapter.
6. The dual-channel gas turbine combustor flame monitoring and light guiding device according to claim 4, wherein a second adapter is arranged on the lateral light outlet, and a refractive lens composite piece is arranged in the second adapter and is used for reflecting the short-wave infrared light again to enable the short-wave infrared light to be consistent with the ultraviolet light outlet direction.
7. The dual channel gas turbine combustor flame monitoring light guide of claim 6, wherein the light outlet of the second adapter is provided with a short wave infrared focusing lens assembly.
8. A dual channel gas turbine combustor flame monitoring light guide as claimed in any one of claims 1 to 3 wherein the front end connection tube is made of stainless steel material.
9. A dual channel gas turbine combustor flame monitoring light guide as claimed in any one of claims 1 to 3 wherein the temperature and pressure resistant lens composite is a glass and metal composite.
10. The dual channel gas turbine combustor flame monitoring light guide of claim 9, wherein the glass is a specialty light transmissive quartz glass.

Description

Dual-channel gas turbine combustion chamber flame monitoring light guide device Technical Field The utility model relates to the technical field of flame monitoring of combustion chambers of gas turbines, in particular to a dual-channel flame monitoring light guide device for a combustion chamber of a gas turbine. Background With the continuous improvement of energy science and technology in China, the gas turbine which is praised as a bright bead on a crown of equipment manufacturing industry gradually realizes domestic development and application, wherein the domestic application of the F-level heavy gas turbine is implemented and commercially operated in a plurality of domestic power plants. The combustion chamber of the gas turbine is taken as one of core components of the equipment and is in a high-temperature and high-pressure environment for a long time, and the combustion chamber and the external interface pipelines are numerous, so that the space size requirement on the related interface pipelines is high and the layout is strict. The gas turbine combustor is generally provided with a single-channel flame monitoring light guide structure with a cooling function, and is used for flame light monitoring in a high-temperature and high-pressure environment in the combustor. With the high-load flexible operation requirement of the new generation gas turbine and the improvement of the reliability and the stability of the gas turbine, the monitoring of the combustion working condition of the combustion chamber is expanded from single flame detection to flame thermal imaging and other functions. Therefore, the arrangement of the multi-path flame light guide channels in the limited space outside the combustion chamber is significant, and the multi-path flame light guide channels can meet the requirements of equipment rear ends such as the flame detection optical fiber light guide and the flame photo-thermal imaging temperature measuring equipment. The Chinese patent document CN214094581U discloses a flame detection device of a combustion chamber of a gas turbine, which mainly comprises structures such as light-transmitting glass, a metal flange, an annular guide plate and the like, wherein flame light in the combustion chamber is transmitted through the light-transmitting glass, the structures such as the light-transmitting glass, a mounting plate and a light source detector are fixed by the metal flange, and uninterrupted compressed air of a cooling medium is input by adopting the annular guide plate structure. The patent adopts a conventional flange sealing structure to seal the light path channel, adopts compressed air to protect and cool the air film of the related light guide mechanism through the annular guide plate structure, ensures that the detection angle of the light source amplifier is unchanged, improves the stability of flame detection, and prevents the system from triggering flameout protection by mistake. With the development of flame monitoring technology and the increase of functions of the gas turbine, the number of the pipelines of the combustion chamber and the external interface is increased, the space is reduced, and the installation space of the device is larger and the installation is influenced by adopting a flange connection mode. The compressed air cooling design has the hidden trouble that a fault point is newly added after the compressed air is out of air and is not protected. Chinese patent document CN118499823a discloses a flame detector mounting structure suitable for a gas turbine, mainly comprising a combustion assembly and a protection assembly. The combustion assembly mainly comprises a combustion device, a detection mechanism on the combustion device, and a flame detector and other structures movably connected to one end of the detection mechanism away from the combustion device. An annular cooling cavity is formed in the combustion device and used for conveying cooling gas for the detection mechanism. The protective component is located inside the detection mechanism and mainly comprises protective glass, and a lower sealing gasket and an upper sealing gasket which are used for bonding and sealing two sides of the protective glass. This patent adopts a scheme in which a flame detector is disposed near a mounting structure, and the flame detector is disposed in a high-temperature, high-pressure region, and is exposed to a severe environment for a long period of time, which may cause degradation or damage of its performance. In addition, the patent adopts the compressed air in the gas turbine body to cool, and the flow and the pressure of the compressed air can fluctuate along with the working condition change of the gas turbine, so that the stability of the cooling effect is affected. And if the compressed air supply of the gas turbine is insufficient (e.g., due to equipment failure or load change), the cooling effect is reduced, which may cause the flame detector to ove