Combustor flame detection device for thermal power plant

Abstract

The utility model relates to the technical field of burner equipment, and discloses a thermal power plant burner flame detection device which comprises an outer sleeve, an inner sleeve and a lens assembly, radial intervals are arranged between the outer sleeve and the inner sleeve and between the inner sleeve and the lens assembly, a first airflow channel is formed between the outer sleeve and the inner sleeve, and a second airflow channel is formed between the inner sleeve and the lens assembly. The inner sleeve and the lens assembly form a second airflow channel, the outer sleeve is provided with an airflow inlet communicated with the first airflow channel, and the inner sleeve is provided with a ventilation opening communicated with the first airflow channel and the second airflow channel; a sealing plate is further included and arranged at the rear ends of the first airflow channel and the second airflow channel in a sealed mode, a first airflow outlet is formed in the front end of the first airflow channel, and a second airflow outlet is formed in the front end of the second airflow channel. The first airflow channel and the second airflow channel form a double-layer cooling structure, cooling airflow directly cools the lens assembly, the cooling effect is enhanced, the front end of the optical fiber is prevented from being burnt out due to too high temperature, and the service life of the flame detection device is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of burner equipment, in particular to a flame detector device for a burner in a thermal power plant. Background Art

[0002] The boiler burner in a thermal power plant is a combustion device for pulverized coal, fuel oil, etc. to enter the furnace. The flame detector device is located at the nozzle position of the burner, and its purpose is to detect (observe) the combustion condition of the burner flame. The burner flame detector device is often in a place with high temperature in the boiler burner (the highest temperature at the burner nozzle can reach more than one thousand degrees Celsius) and high dust concentration. Therefore, it is necessary to cool the flame detector device.

[0003] The patent with the application publication number CN112594733A discloses a flame detector with an improved cooling device. The flame detector consists of a flame detection probe, a signal processing and communication module, a cable assembly, and a thermal gas mass flowmeter configured with a LoRa wireless module; the flame detection probe includes an optical lens group, an optical fiber, a photosensitive element, an inner / outer conduit, and a self-cleaning air outlet ring. Micropores are arranged on the outer conduit, and the cooling air is divided into two paths; one path passes through the micropores of the outer conduit and forms a gas film cooling on its outer surface, so as to fully exert the cooling potential of double-layer cooling: the air duct design of the Venturi air outlet enables the cooling air to blow out from the periphery around the front of the lens and direct the air flow towards the center of the lens, improving the cooling effect of the lens and having a self-cleaning function. The optical fiber and the photosensitive element of the flame detector form a lens assembly to collect flame data. At the same time, a cooling air duct is formed between the inner and outer conduits, and the lens assembly inside the inner conduit is cooled by using the cooling air duct.

[0004] However, due to the too high temperature at the front end of the flame detector device, the existing flame detector cooling method flows between the inner and outer conduits, mainly cooling the inner and outer conduits, resulting in a relatively high temperature at the front end of the optical fiber of the lens assembly, so that the cooling air entering the inner conduit cannot fully meet the requirements for cooling the optical fiber, and finally the optical fiber is burned out, affecting the service life of the flame detector device. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a flame detector device for a burner in a thermal power plant to solve the problem that the temperature at the front end of the optical fiber of the existing flame detector device is relatively high, and the cooling air cannot fully cool the optical fiber and burns out the optical fiber.

[0006] To achieve the above object, the utility model provides a flame detector device for a burner in a thermal power plant, which comprises an outer sleeve, an inner sleeve and a lens assembly. The inner sleeve is coaxially sleeved inside the outer sleeve, and the lens assembly is coaxially sleeved inside the inner sleeve. There are radial intervals between the outer sleeve and the inner sleeve, and between the inner sleeve and the lens assembly. A first air flow channel is formed between the outer sleeve and the inner sleeve, and a second air flow channel is formed between the inner sleeve and the lens assembly. The outer sleeve is provided with an air flow inlet communicating with the first air flow channel, and the inner sleeve has a ventilation opening communicating the first air flow channel with the second air flow channel.

[0007] It further includes a sealing plate, which is sealingly arranged at the rear ends of the first air flow channel and the second air flow channel. The front end of the first air flow channel has a first air flow outlet, and the front end of the second air flow channel has a second air flow outlet.

[0008] Preferably, the air flow inlet is perpendicular to the outer sleeve, and the ventilation opening is coaxially arranged with the air flow inlet.

[0009] Preferably, it further includes a front end plate, which is arranged at the front end of the first air flow channel. The front end plate is connected between the outer sleeve and the inner sleeve. One end of the front end plate connected to the outer sleeve is inclined away from the sealing plate, and the first air flow outlet is formed on the front end plate.

[0010] Preferably, the front end plate is of a fan blade plate structure, and there are spiral swirl channels between the fan blade plates, and the swirl channels form the first air flow outlet.

[0011] Preferably, the front ends of the inner sleeve and the lens assembly are of an open structure with an annular opening, and the annular opening forms the second air flow outlet.

[0012] Preferably, the lens assembly includes an optical fiber and a lens. The optical fiber is coaxially arranged inside the inner sleeve, the lens is arranged at the front end of the optical fiber, and the second air flow channel is arranged between the optical fiber and the inner sleeve.

[0013] Compared with the prior art, the beneficial effect of the burner flame detector device of the thermal power plant in the embodiment of the present utility model lies in that: a second air flow channel is formed between the inner sleeve and the lens assembly, and the ventilation port connects the first air flow channel and the second air flow channel. When the flame detector device works, part of the cooling air flow entering the first air flow channel through the air flow inlet can enter the second air flow channel through the ventilation port, and the cooling air flow flows between the first air flow channel and the second air flow channel at the same time. Due to the sealing of the rear end by the sealing plate, the cooling air flow is discharged through the first air flow outlet and the second air flow outlet. The first air flow channel and the second air flow channel form a double-layer cooling structure, and the cooling air flow directly cools the lens assembly, enhancing the cooling effect, avoiding the front end of the optical fiber from being burned out due to excessive temperature, and extending the service life of the flame detector device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the burner flame detector device of the thermal power plant of the present utility model;

[0015] Figure 2 is Figure 1 the right view of the burner flame detector device of the thermal power plant;

[0016] Figure 3 is Figure 1 the enlarged schematic structural diagram of part A of the burner flame detector device of the thermal power plant.

[0017] In the figure, 1, outer sleeve; 2, inner sleeve; 3, lens assembly; 31, optical fiber; 32, lens; 4, sealing plate; 5, first air flow channel; 6, second air flow channel; 7, air flow inlet; 8, ventilation port; 9, first air flow outlet; 10, second air flow outlet; 11, front end plate; 12, cable. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0019] A preferred embodiment of the burner flame detector device of the thermal power plant of the present utility model is as Figures 1 to 3 shown. The burner flame detector device of the thermal power plant includes an outer sleeve 1, an inner sleeve 2, a lens assembly 3, and a sealing plate 4. The outer sleeve 1 is the outermost structure of the flame detector device and is used to protect the inner sleeve 2 and the lens assembly 3 inside. The inner sleeve 2 further protects the lens assembly 3 inside. The lens assembly 3 is used to collect flame data. A cable 12 is connected to the lens assembly 3, and the cable 12 is used to connect to an external control room to transmit the flame data to the control room for observation and control.

[0020] The inner sleeve 2 is coaxially sleeved inside the outer sleeve 1, and the lens assembly 3 is coaxially sleeved inside the inner sleeve 2. There are radial intervals between the outer sleeve 1 and the inner sleeve 2, and between the inner sleeve 2 and the lens assembly 3, such that an annulus is formed between the outer sleeve 1 and the inner sleeve 2, and between the inner sleeve 2 and the lens assembly 3. A first air flow channel 5 is formed between the outer sleeve 1 and the inner sleeve 2, and a second air flow channel 6 is formed between the inner sleeve 2 and the lens assembly 3. Cooling air can be introduced into the two air flow channels simultaneously to form a double-layer cooling structure. The air flow in the second air flow channel 6 can directly cool the lens assembly 3.

[0021] An air flow inlet 7 is provided on the outer sleeve 1. The air flow inlet 7 is communicated with the first air flow channel 5. A ventilation opening 8 is provided on the inner sleeve 2. The ventilation opening 8 communicates the first air flow channel 5 and the second air flow channel 6. The air flow inlet 7 is used to communicate with external compressed air. The compressed air, as the cooling air flow, enters the first air flow channel 5 through the air flow inlet 7, and part of the cooling air flow enters the second air flow channel 6 through the ventilation opening 8 and flows simultaneously in the first air flow channel 5 and the second air flow channel 6 to cool the outer sleeve 1, the inner sleeve 2 and the lens assembly 3 simultaneously.

[0022] The sealing plate 4 is arranged at the rear ends of the inner sleeve 2, the outer sleeve 1 and the lens assembly 3, where the rear end is the end far from the flame when the flame detector device is in use. Correspondingly, the front end is the end facing the flame when the flame detector device is in use. The sealing plate 4 seals the rear ends of the first air flow channel 5 and the second air flow channel 6. At the same time, the front end of the first air flow channel 5 has a first air flow outlet 9, and the front end of the second air flow channel 6 has a second air flow outlet 10. When the cooling air flow flows in the first air flow channel 5 and the second air flow channel 6, since the rear end is sealed by the sealing plate 4, the cooling air flow flows out through the first air flow outlet 9 and the second air flow outlet 10, which can cool the front end of the lens assembly 3. At the same time, the air flow also has a purging effect on the front end of the lens assembly 3, which can reduce ash accumulation and coking.

[0023] The flame detector device of the thermal power plant burner forms a second air flow channel 6 between the inner sleeve 2 and the lens assembly 3, and the ventilation opening 8 connects the first air flow channel 5 and the second air flow channel 6. When the flame detector device is working, part of the cooling air flow entering the first air flow channel 5 through the air flow inlet 7 can enter the second air flow channel 6 through the ventilation opening 8. The cooling air flow flows simultaneously between the first air flow channel 5 and the second air flow channel 6. Due to the sealing of the rear end by the sealing plate 4, the cooling air flow is discharged through the first air flow outlet 9 and the second air flow outlet 10. The first air flow channel 5 and the second air flow channel 6 form a double-layer cooling structure. The cooling air flow directly cools the lens assembly 3, enhancing the cooling effect, avoiding the front end of the optical fiber 31 from being burned out due to excessive temperature, and prolonging the service life of the flame detector device.

[0024] Preferably, the air flow inlet 7 is perpendicular to the outer sleeve 1, and the ventilation opening 8 is coaxially arranged with the air flow inlet 7.

[0025] The air inlet 7 and the ventilation opening 8 are coaxially arranged. When the air flow enters the first air flow channel 5 through the air inlet 7, part of the cooling air flow can directly enter the ventilation opening 8 and flow through the second air flow channel 6, reducing the distance between the second air flow channel 6 and the air inlet 7 and ensuring that the cooling air flow cools the lens assembly 3 in time.

[0026] Preferably, it further includes a front end plate 11 which is arranged at the front end of the first air flow channel 5. The front end plate 11 is connected between the outer sleeve 1 and the inner sleeve 2. One end of the front end plate 11 connected to the outer sleeve 1 is inclined away from the sealing plate 4, and the first air outlet 9 is formed on the front end plate 11.

[0027] The front end plate 11 seals the front end of the first air flow channel 5, and the first air outlet 9 is formed on the front end plate 11. The sealing effect of the front end plate 11 has a function of concentrating and accelerating the air flow. The speed of the air flow blowing out from the first air outlet 9 is fast and the cold zone effect is good. Since one end of the front end plate 11 connected to the outer sleeve 1 is inclined away from the sealing plate 4, the cooling air flow inclines towards the middle when flowing out from the first air outlet 9, which has a purging effect on the lens assembly 3 located in the middle.

[0028] Preferably, the front end plate 11 is of a fan blade plate structure, and there are spiral swirling channels between the fan blade plates, and the swirling channels form the first air outlet 9.

[0029] The front end plate 11 adopts a fan blade plate structure. When the gas blows out from the swirling channels between the fan blade plates, it flows in a spiral shape, which can strengthen the disturbance effect of the air flow, the purging effect is more obvious, and the fouling at the front end of the flame detection device is reduced.

[0030] Preferably, the front end of the inner sleeve 2 and the lens assembly 3 is an open structure with an annular opening, and the annular opening forms the second air outlet 10.

[0031] The front end of the inner sleeve 2 and the lens assembly 3 is an open structure. The air flow blows out axially from the second air outlet 10 and impacts with the spiral air flow blown out from the first air outlet 9. The air flow disturbance effect is obvious, avoiding coking and fouling at the front end position of the wafer assembly and ensuring clear flame detection.

[0032] Preferably, the lens assembly 3 includes an optical fiber 31 and a lens 32. The optical fiber 31 is coaxially arranged inside the inner sleeve 2, the lens 32 is arranged at the front end of the optical fiber 31, and the second air flow channel 6 is arranged between the optical fiber 31 and the inner sleeve 2.

[0033] The lens assembly 3 is formed by the optical fiber 31 and the lens 32. The lens 32 is used to collect flame information. The cooling gas in the second air flow channel 6 directly cools the front end of the optical fiber 31 to prevent the optical fiber 31 from being burned out.

[0034] In summary, the embodiment of the present utility model provides a flame detector device for a burner in a thermal power plant, which forms a second air flow channel between the inner sleeve and the lens assembly, and the ventilation port connects the first air flow channel and the second air flow channel. When the flame detector device works, the cooling air flow entering the first air flow channel through the air flow inlet can partially enter the second air flow channel through the ventilation port, and the cooling air flow flows between the first air flow channel and the second air flow channel at the same time. Due to the sealing of the rear end of the sealing plate, the cooling air flow is discharged through the first air flow outlet and the second air flow outlet. The first air flow channel and the second air flow channel form a double-layer cooling structure, and the cooling air flow directly cools the lens assembly, strengthening the cooling effect, avoiding the front end of the optical fiber from being burned out due to excessive temperature, and extending the service life of the flame detector device.

[0035] The above is only the preferred embodiment of the present utility model. It should be noted that for those of ordinary skill in the art of this technology, without departing from the technical principle of the present utility model, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present utility model.

Claims

1. A flame detector device for a burner in a thermal power plant, characterized in that, It includes an outer sleeve (1), an inner sleeve (2) and a lens assembly (3). The inner sleeve (2) is coaxially sleeved inside the outer sleeve (1), and the lens assembly (3) is coaxially sleeved inside the inner sleeve (2). There are radial intervals between the outer sleeve (1) and the inner sleeve (2), and between the inner sleeve (2) and the lens assembly (3). A first air flow channel (5) is formed between the outer sleeve (1) and the inner sleeve (2), and a second air flow channel (6) is formed between the inner sleeve (2) and the lens assembly (3). The outer sleeve (1) is provided with an air flow inlet (7) communicating with the first air flow channel (5), and the inner sleeve (2) has a vent (8) communicating the first air flow channel (5) with the second air flow channel (6). It further includes a sealing plate (4). The sealing plate (4) is sealingly arranged at the rear ends of the first air flow channel (5) and the second air flow channel (6). The front end of the first air flow channel (5) has a first air flow outlet (9), and the front end of the second air flow channel (6) has a second air flow outlet (10).

2. The burner flame detection device for a thermal power plant according to claim 1, characterized in that, The air flow inlet (7) is perpendicular to the outer sleeve (1), and the vent (8) is coaxially arranged with the air flow inlet (7).

3. The burner flame detector device of a thermal power plant according to claim 1 or 2, characterized in that, It further includes a front end plate (11). The front end plate (11) is arranged at the front end of the first air flow channel (5). The front end plate (11) is connected between the outer sleeve (1) and the inner sleeve (2). One end of the front end plate (11) connected to the outer sleeve (1) is inclined away from the sealing plate (4), and the first air flow outlet (9) is opened on the front end plate (11).

4. The burner flame detection device of a thermal power plant according to claim 3, characterized in that, The front end plate (11) is of a fan blade plate structure, and there are spiral swirl channels between the fan blades. The swirl channels form the first air flow outlet (9).

5. The burner flame detector device for a thermal power plant according to claim 1 or 2, characterized in that The front ends of the inner sleeve (2) and the lens assembly (3) are of an open structure with an annular opening, and the annular opening forms the second air flow outlet (10).

6. The burner flame detection device of a thermal power plant according to claim 1 or 2, characterized in that, The lens assembly (3) includes an optical fiber (31) and a lens (32). The optical fiber (31) is coaxially arranged inside the inner sleeve (2), the lens (32) is arranged at the front end of the optical fiber (31), and the second air flow channel (6) is arranged between the optical fiber (31) and the inner sleeve (2).

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