A flame detection device for a gas turbine combustion chamber

Abstract

The present invention relates to a flame detection device for a combustion chamber of a gas turbine, comprising: a light-transmitting glass fixed on an outer cylinder of a combustion chamber through a metal flange; a mounting plate mounted on the metal flange and having a light-transmitting hole for light passing through the light-transmitting glass; a light source amplifier mounted on the mounting plate and used to receive light passing through the light-transmitting glass; a photoelectric converter, the input end of which is connected to the light source amplifier, and the output end of which is connected to a host computer; the device also includes an annular guide plate, which is arranged between the mounting plate and the light source amplifier, and is provided with a plurality of air outlets, and the mounting plate is provided with a plurality of air guide holes corresponding to each of the air outlets, and the air inlet end of the annular guide plate is connected to a compressed air source. Compared with the prior art, the present invention has the advantages of preventing the gas turbine system from triggering a flameout protection action by mistake.

Description

Technical Field

[0001] The invention relates to a gas turbine detection device, in particular to a gas turbine combustion chamber flame detection device. Background Art

[0002] The gas turbine flame detector monitors the combustion conditions in the combustion chamber by detecting the light source emitted by the flame burning in the combustion chamber of the gas turbine. On the basis of determining the three-dimensional spatial position of the flame burning in the combustion chamber, a flame detector is installed at a position close to 45° on both sides of the upper half of the combustion chamber, and the field of view of the two detectors is used to form an intersection point, which is aligned with the center point of the entire flame combustion space to ensure that the flame signals collected by the two detectors are always consistent.

[0003] The flame detector can determine the establishment and extinction of the flame in the combustion chamber of the gas turbine, and monitor the combustion status of the unit during startup, decommissioning and operation in real time. When the combustion chamber is extinguished, the two flame detectors cannot collect flame signals, and the two-out-of-two triggers the flameout protection action, the gas turbine trips, the fuel emergency shut-off valve is turned off, and the fuel valve is closed to prevent fuel accumulation in the fuel chamber, causing dangerous situations such as combustion chamber explosion.

[0004] However, in actual applications, it often happens that the combustion chamber is burning normally, but the system still triggers the flameout protection action, and the interlocked steam turbine trips at the same time, which will increase the EOH time (effective operating hours) of the gas turbine and shorten the operating time of the gas turbine. Summary of the invention

[0005] After analysis and research by the inventors, it was found that the reason why the system mistakenly triggered the flameout protection action was that the detection angle was offset due to the thermal deformation of the mounting plate and the thermal breakage of the light-transmitting glass, resulting in the light source amplifier receiving too small a light source.

[0006] The purpose of the present invention is to provide a flame detection device for a gas turbine combustion chamber. By arranging an annular guide plate and corresponding air outlet holes and air guide holes with special structures, a cooling air film can be formed between the mounting plate and the metal flange and around the light-transmitting glass, thereby avoiding the system's false triggering of flameout protection due to the misalignment of the light path between the light-transmitting glass and the light source amplifier, avoiding increasing the EOH time of the gas turbine and reducing the operating time of the gas turbine.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A gas turbine combustion chamber flame detection device, comprising:

[0009] Light-transmitting glass, fixed to the outer cylinder of the combustion chamber by a metal flange;

[0010] A mounting plate, mounted on the metal flange, and having a light-transmitting hole for light transmitted through the light-transmitting glass to pass through;

[0011] A light source amplifier is mounted on the mounting plate and is used to receive light transmitted through the light-transmitting glass;

[0012] Photoelectric converter, the input end is connected to the light source amplifier, and the output end is connected to the host computer;

[0013] The device also includes an annular guide plate, which is arranged between the mounting plate and the light source amplifier and has a plurality of air outlet holes. The mounting plate is provided with a plurality of air guide holes corresponding to the air outlet holes one by one, and the air inlet end of the annular guide plate is connected to a compressed air source.

[0014] The mounting plate is a Teflon plate.

[0015] The mounting plate is mounted on the metal flange by bolts.

[0016] There are three bolts in total.

[0017] There are four air outlet holes and four air guide holes.

[0018] The diameter of the air outlet is 2-5 cm.

[0019] The diameter of the air outlet is 3 cm.

[0020] The diameter of the air guide hole on one side near the annular guide plate is consistent with the diameter of the air outlet hole.

[0021] The air guide hole gradually expands from one side of the proximal annular guide plate to the other side.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. By setting up an annular guide plate and corresponding air outlet holes and air guide holes with special structures, a cooling air film can be formed between the mounting plate and the metal flange and around the light-transmitting glass, thereby avoiding the system's false triggering of flameout protection due to the misalignment of the light path between the light-transmitting glass and the light source amplifier, avoiding the increase of the gas turbine EOH time and reducing the gas turbine's operating time.

[0024] 2. It increases the reliability of Teflon plates, eliminates the problem of thermal deformation, and reduces the cost of daily inspection and maintenance of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Among them: 1. light-transmitting glass, 2. metal flange, 3. mounting plate, 4. light source amplifier, 5. annular guide plate, 6. bolts, 7. cylinder body. DETAILED DESCRIPTION

[0027] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0028] A gas turbine combustion chamber flame detection device, comprising:

[0029] The light-transmitting glass 1 is fixed to the outer cylinder of the combustion chamber through a metal flange 2;

[0030] The mounting plate 3 is mounted on the metal flange 2 and has a light-transmitting hole for the light transmitted through the light-transmitting glass 1 to pass through;

[0031] The light source amplifier 4 is mounted on the mounting plate 3 and is a convex high-temperature glass, and is used to receive the light transmitted through the light-transmitting glass 1;

[0032] A photoelectric converter, the input end of which is connected to the light source amplifier 4, and the output end of which is connected to the host computer;

[0033] The device also includes an annular guide plate 5, which is arranged between the mounting plate 3 and the light source amplifier 4, and is provided with a plurality of air outlet holes 51. The mounting plate 3 is provided with a plurality of air guide holes 31 corresponding to each air outlet hole 51. The air inlet end of the annular guide plate 5 is connected to a compressed air source.

[0034] By providing the annular guide plate 5 and the corresponding air outlet holes 51 and the specially structured air guide holes 31, a cooling air film can be formed between the mounting plate and the metal flange and on the surface of the light-transmitting glass, thereby avoiding the system's false triggering of flameout protection due to misalignment of the light-transmitting glass and the light source amplifier pipeline, avoiding an increase in the EOH time of the gas turbine and a reduction in the operating time of the gas turbine.

[0035] The mounting plate 3 has a diameter of 60 cm and is a Teflon plate. The mounting plate 3 is mounted on the metal flange 2 by bolts, wherein three bolts are provided. In addition, four air outlet holes 51 and four air guide holes 31 are provided.

[0036] The diameter of the air outlet hole 51 is 2-5 cm, and preferably, the diameter of the air outlet hole 51 is 3 cm.

[0037] The diameter of the air guide hole 31 on one side of the near-annular guide plate 5 is consistent with the diameter of the air outlet hole 51. The air guide hole 31 gradually expands from one side of the near-annular guide plate 5 to the other side, thereby realizing airflow passing through three directions. The airflow in two directions forms an air film between the mounting plate and the metal flange and around the periphery of the light-transmitting glass. The airflow in the middle direction can also cool the metal flange that fixes the light-transmitting glass. In addition, in other embodiments, a guide block is also provided in the air guide hole 31.

[0038] An annular guide plate 5 is installed above the Teflon plate, and compressed air of the cooling medium is introduced into the inside. The compressed air is blown into the four air guide holes 31 on the Teflon plate through the four air outlet holes 51 of the annular guide plate 5, and a layer of air film is formed on the heating surface between the Teflon plate and the metal flange 2, and on the periphery of the light-transmitting glass 1, so that the radiated high-temperature heat cannot directly contact the Teflon plate. At the same time, the compressed air can also cool the three bolts 6 fixing the Teflon plate, so that the Teflon plate will not be deformed by heat. It is ensured that the detection angle of the light source amplifier 4 remains unchanged.

Claims

1. A gas turbine combustion chamber flame detection device, comprising: The light-transmitting glass (1) is fixed to the outer cylinder of the combustion chamber via a metal flange (2); A mounting plate (3) mounted on the metal flange (2) and having a light-transmitting hole for light transmitted through the light-transmitting glass (1) to pass through; A light source amplifier (4) is mounted on the mounting plate (3) and is used to receive light transmitted through the light-transmitting glass (1); A photoelectric converter, the input end of which is connected to the light source amplifier (4) and the output end of which is connected to the host computer; The device is characterized in that the device further comprises an annular guide plate (5), the annular guide plate (5) being arranged between the mounting plate (3) and the light source amplifier (4), and having a plurality of air outlet holes (51) thereon, the mounting plate (3) being provided with a plurality of air guide holes (31) corresponding one-to-one to the air outlet holes (51), and the air inlet end of the annular guide plate (5) being connected to a compressed air source; The mounting plate (3) is a Teflon plate; The diameter of the air guide hole (31) on one side of the annular guide plate (5) is consistent with the diameter of the air outlet hole (51); The air guide holes (31) gradually expand from one side of the proximal annular guide plate (5) to the other side, so that airflow can pass through in three directions, wherein airflow in two directions forms an air film between the mounting plate (3) and the metal flange (2) and around the periphery of the light-transmitting glass (1), and airflow in the middle direction cools the metal flange (2) that fixes the light-transmitting glass (1).

2. A gas turbine combustion chamber flame detection device according to claim 1, characterized in that: The compressed air source is an air compressor.

3. A gas turbine combustion chamber flame detection device according to claim 1, characterized in that: The mounting plate (3) is mounted on the metal flange (2) by means of bolts.

4. A gas turbine combustion chamber flame detection device according to claim 3, characterized in that: There are three bolts in total.

5. A gas turbine combustion chamber flame detection device according to claim 1, characterized in that: The air outlet holes (51) and the air guide holes are each provided with four.

6. A gas turbine combustion chamber flame detection device according to claim 1, characterized in that: The diameter of the air outlet hole (51) is 2-5 cm.

7. A gas turbine combustion chamber flame detection device according to claim 1, characterized in that: The diameter of the air outlet hole (51) is 3 cm.

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