A power plant boiler and fire detection sleeve

Abstract

The application provides a power station boiler and a fire detection sleeve. The power station boiler comprises a boiler body, a furnace and a fire detection inlet. The fire detection inlet is arranged at the top of the boiler body and communicates with the furnace. A pipeline support is arranged on the boiler body and directly above the fire detection inlet. The fire detection device comprises the fire detection sleeve. The fire detection sleeve comprises a steel lower pipe section, a flexible pipe section and a steel upper pipe section. The upper end of the flexible pipe section is connected with the lower end of the steel upper pipe section. The lower end of the flexible pipe section is connected with the upper end of the steel lower pipe section. The steel lower pipe section and the flexible pipe section are located in the furnace. The steel upper pipe section is at least partially located outside the furnace. The steel upper pipe section is fixed to the fire detection inlet. The fire detector comprises a fire detection probe. The fire detection probe is arranged in the fire detection sleeve and at least part of the fire detection probe extends from the lower end of the steel lower pipe section. When the flexible pipe section is bent, the straight line distance between the two ends of the fire detection sleeve is less than the distance between the pipeline support and the fire detection inlet. The fire detection probe is more convenient and complete in coke removal.

Description

Technical Field

[0001] This invention relates to the field of power plant power generation technology, specifically to a power plant boiler and a flame detection sleeve. Background Technology

[0002] Flame detection is a necessary part of furnace safety inspection in power plant boilers, using flame detectors to monitor combustion within the furnace. The flame detector probe extends into the furnace, and its surface is prone to coking, requiring regular cleaning. However, existing technologies suffer from difficulties in cleaning the flame detector probe, leading to incomplete cleaning. Summary of the Invention

[0003] This invention is based on the inventor's discoveries and understanding of the following facts and problems:

[0004] In related technologies, the only way to remove the flame detector probe is to pull it out of the flame detector sleeve for descaling, which is inconvenient and results in incomplete descaling.

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, an embodiment of this invention proposes a power plant boiler, comprising: a boiler body, the boiler body including a furnace and a flame detection inlet, the flame detection inlet being disposed at the top of the boiler body and communicating with the furnace; a pipeline support, the pipeline support being disposed on the boiler body and located directly above the flame detection inlet; and a flame detection device; the flame detection device comprising: a flame detection sleeve, the flame detection sleeve including a rigid lower pipe section, a flexible pipe section, and a rigid upper pipe section, the upper end of the flexible pipe section being connected to the lower end of the rigid upper pipe section, and so on. The lower end of the flexible pipe section is connected to the upper end of the rigid lower pipe section. The rigid lower pipe section and the flexible pipe section are located inside the furnace. At least part of the rigid upper pipe section is located outside the furnace and is fixed to the flame detector inlet. A flame detector is provided, including a flame detector probe, which is inserted into the flame detector sleeve and at least a part of the flame detector probe extends from the lower end of the rigid lower pipe section. When the flexible pipe section is bent, the vertical distance between the upper and lower ends of the flame detector sleeve is less than the vertical distance between the pipeline support and the flame detector inlet.

[0006] In some embodiments, the power plant boiler further includes a cold air fan; the flame detection sleeve further includes a cold air connector communicating with the rigid upper pipe section, and the cold air connector is connected to the cold air fan.

[0007] In some embodiments, the inner wall of the flexible tube segment is provided with corrugated grooves.

[0008] In some embodiments, the inner wall of the rigid lower pipe section is provided with a plurality of flow guide grooves, the plurality of flow guide grooves are distributed circumferentially in the rigid lower pipe section, each flow guide groove is connected to the corrugated groove, and each flow guide groove extends axially along the rigid lower pipe section to the lower end of the rigid lower pipe section.

[0009] In some embodiments, the cross-sectional area of ​​the guide channel gradually decreases from the air inlet of the guide channel to the air outlet of the guide channel.

[0010] In some embodiments, the flame detection device further includes an external explosion-proof housing, a processor, and a signal line. The external explosion-proof housing is connected to the rigid upper pipe section and located outside the boiler body. The processor is disposed inside the external explosion-proof housing. The flame detection probe is connected to the processor via the signal line, which is located inside the flame detection sleeve. When the flexible pipe section is bent, the vertical distance between the bottom surface of the flame detection probe and the top surface of the external explosion-proof housing is less than the vertical distance between the pipeline support and the flame detection inlet.

[0011] In some embodiments, the upper end of the rigid lower pipe section is threadedly connected to the lower end of the flexible pipe section by a first nut. The rigid upper pipe section includes an integrally formed first pipe body and a second pipe body. The diameter of the first pipe body is larger than the diameter of the flame detector inlet. The lower end of the second pipe body is threadedly connected to the upper end of the flexible pipe section by a second nut. The diameter of the second pipe body is smaller than the diameter of the flame detector inlet. The first pipe body is fixedly connected to the flame detector inlet.

[0012] In some embodiments, the flame detection sleeve further includes a sealing ring, which is sleeved on the first tube body and located between the bottom of the second tube body and the flame detection inlet.

[0013] The present invention also provides a flame detection sleeve, comprising: a rigid upper pipe section; a flexible pipe section, the upper end of which is connected to the lower end of the rigid upper pipe section; and a rigid lower pipe section, the upper end of which is connected to the lower end of the flexible pipe section; wherein, when the flexible pipe section is bent, the vertical distance between the upper and lower ends of the flame detection sleeve is less than the vertical distance between the upper and lower ends of the flame detection sleeve when the flexible pipe section is straight.

[0014] In some embodiments, the flame detection sleeve further includes: a cold air connector, the cold air connector being connected to the rigid upper pipe section; a corrugated groove being provided on the inner wall of the flexible pipe section; and a plurality of guide grooves being provided on the inner wall of the rigid lower pipe section, the plurality of guide grooves being distributed circumferentially on the rigid lower pipe section, each guide groove being connected to the corrugated groove, and each guide groove extending axially along the rigid lower pipe section to the lower end of the rigid lower pipe section.

[0015] The power plant boiler and flame detection sleeve of the present invention have the following technical effects:

[0016] (1) By setting the flame detector sleeve as a series of interconnected rigid lower pipe section, flexible pipe section, and rigid upper pipe section, the flexible pipe section can be bent. When the flexible pipe section bends, the vertical distance between the upper and lower ends of the flame detector sleeve is less than the vertical distance between the pipeline support and the flame detector inlet, allowing the flame detector sleeve and the flame detector probe to be pulled out together. The descaling operation of the flame detector probe can be performed at the flame detector inlet. Since the aperture of the flame detector inlet is larger than the aperture of the flame detector sleeve, the descaling operation space is larger, descaling is more convenient and more thorough, ensuring the accuracy of the flame detection results, reducing the number of descaling operations, and reducing the risk to operators. In addition, since the upper and lower parts of the flame detector sleeve are both rigid pipes, it is convenient to insert the flame detector probe into the flame detector sleeve. The rigid lower pipe section facilitates the positioning of the flame detector probe in the furnace, and the rigid upper pipe section facilitates fixation to the boiler body.

[0017] (2) The corrugated groove on the inner wall of the flexible pipe section facilitates the bending and deformation of the flexible pipe section. On the other hand, when the cold air flows through the corrugated groove, most of the airflow becomes a swirling flow. This swirling flow cools the flame detector probe in multiple directions at the lower end outlet of the flame detector sleeve, thus improving the cooling effect.

[0018] (3) When the cold airflow passes through the corrugated groove, most of the airflow becomes a swirling flow. Part of the swirling flow cools the flame detector probe in multiple directions at the lower end of the flame detector sleeve outlet. The other part of the swirling flow is dispersed to each guide groove. After being guided by the guide groove, it is blown toward the flame detector probe at the lower end of the rigid lower pipe section. The corrugated groove on the inner wall of the flexible pipe section plays a role in stabilizing the flow, so that part of the swirling flow can smoothly enter the guide groove. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of a power plant boiler provided according to some embodiments of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of a flame detection device provided according to some embodiments of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of a flame detector sleeve provided according to some embodiments of the present invention. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] Reference Figures 1 to 3 The present invention provides a power plant boiler 100, including: boiler body 10, pipeline support 12 and flame detection device 20.

[0024] The boiler body 10 includes a furnace A and a flame detector inlet 11. The flame detector inlet 11 is located at the top of the boiler body 10 and communicates with the furnace A. A pipeline support 12 is installed on the boiler body 10 and is located directly above the flame detector inlet 11. The pipeline support 12 is used to support and fix the cables and / or pipes of the power plant boiler 100. The term "directly above" should be interpreted broadly, meaning that the pipeline support 12 can be located vertically directly above the flame detector inlet 11, or at a certain angle diagonally above the flame detector inlet 11.

[0025] The flame detection device 20 includes a flame detection sleeve 21 and a flame detector. The flame detection sleeve 21 includes a rigid lower pipe section 211, a flexible pipe section 213, and a rigid upper pipe section 212. The upper end of the flexible pipe section 213 is connected to the lower end of the rigid upper pipe section 212, and the lower end of the flexible pipe section 213 is connected to the upper end of the rigid lower pipe section 211. The rigid lower pipe section 21 and the flexible pipe section 213 are located inside the furnace A, and the rigid upper pipe section 212 is at least partially located outside the furnace A. The rigid upper pipe section 212 is fixed to the flame detection inlet 11. The flame detector includes a flame detection probe 22, which passes through the flame detection sleeve 21, with at least a portion of the probe extending from the lower end of the rigid lower pipe section 211. When the flexible pipe section 213 bends, the vertical distance between the upper and lower ends of the flame detection sleeve 21 is less than the vertical distance between the pipeline support 12 and the flame detection inlet 11.

[0026] During the flame detection process of the flame detector 22 within furnace A, the flame detector 22 is prone to coking and requires regular cleaning to ensure accurate flame detection. The flame detector sleeve 21 protects the connecting wires of the flame detector 22 and positions the flame detector 22; the length of the flame detector sleeve 21 determines the detection position of the flame detector 22 within furnace A. The flame detector inlet 11 is directly above a pipeline support 12, and the length of the flame detector sleeve 21 is greater than the vertical distance between the flame detector inlet and the pipeline support 12. Changing the position of the pipeline support 12 would require corresponding changes to the power plant boiler's cables and / or piping, which is difficult to implement. Changing the length of the flame detector sleeve 21 would lead to inaccurate positioning of the flame detector 22 within furnace A.

[0027] In related technologies, the flame detection sleeve is typically a single steel pipe. Due to interference between the sleeve and the overhead pipeline support, the sleeve cannot be removed. The flame detector probe must be pulled out for descaling. To prevent burns to workers from the coke, descaling must be performed at the upper end of the sleeve, allowing the coke to fall back into the furnace A while descaling, thus avoiding environmental pollution. However, the upper end of the sleeve has a small aperture, limiting the descaling space between the sleeve and the probe, making descaling inconvenient and incomplete each time. This makes the probe more prone to coking, leading to frequent inaccurate flame detection signals, high descaling frequency, and high coke temperatures, increasing the risk to workers.

[0028] To address this, the present invention configures the flame detection sleeve 21 as a series of interconnected rigid lower pipe section 211, flexible pipe section 213, and rigid upper pipe section 212. The flexible pipe section 213 is bendable, and when the flexible pipe section 213 bends, the vertical distance between the two ends of the flame detection sleeve 21 is less than the vertical distance between the pipeline support 12 and the flame detection inlet 11. This allows the flame detection sleeve 21 and the flame detection probe 22 to be pulled out together. The descaling operation of the flame detection probe 22 can be performed at the flame detection inlet 11. Since the aperture of the flame detection inlet 11 is larger than that of the flame detection sleeve 21, there is more space for descaling, making descaling more convenient and thorough, ensuring the accuracy of the flame detection results, reducing the number of descaling operations, and lowering the risk to operators. In addition, since the upper and lower parts of the flame detection sleeve 21 are both rigid pipes, it is convenient for the flame detection probe 22 to be inserted into the flame detection sleeve 21. The rigid lower pipe section 211 facilitates the positioning of the flame detection probe 22 in the furnace A, and the rigid upper pipe section 212 facilitates its fixation to the boiler body 10.

[0029] In some embodiments, the flame detection device 20 further includes an external explosion-proof housing 23, a processor, and a signal line 24. The external explosion-proof housing 23 is connected to the rigid upper pipe section 212 and located outside the boiler body 10. The processor is disposed inside the external explosion-proof housing 23. The flame detection probe 22 is connected to the processor via the signal line 24, which is located inside the flame detection sleeve 21. When the flexible pipe section 213 bends, the vertical distance between the bottom surface (lower surface) of the flame detection probe 22 and the top surface (upper surface) of the external explosion-proof housing 23 is less than the vertical distance between the pipeline support 12 and the flame detection inlet 11. This configuration eliminates the need to disassemble the flame detection device 20 and pull out the flame detector and flame detection sleeve 21 together.

[0030] In some embodiments, the upper end of the rigid lower pipe section 211 is threadedly connected to the lower end of the flexible pipe section 213 by a first nut 216. The rigid upper pipe section 212 includes an integrally formed first pipe body 2121 and a second pipe body 2122. The lower end of the second pipe body 2122 is threadedly connected to the upper end of the flexible pipe section 213 by a second nut 217. The diameter of the first pipe body 2121 is larger than the diameter of the flame detector inlet 11, and the diameter of the second pipe body 2122 is smaller than the diameter of the flame detector inlet 11.

[0031] The rigid upper pipe section 212 is a stepped steel pipe. The flame detection sleeve 21 is inserted into the flame detection inlet 11. The lower end face of the first pipe body 2121 is fixed to the flame detection inlet 11 to prevent the flame detection sleeve 21 from falling into the boiler body 10.

[0032] Furthermore, the flame detection sleeve 21 also includes a sealing ring 218, which is fitted onto the second tube body 2122 and located between the bottom of the first tube body 2122 and the flame detection inlet 11. This further improves the sealing performance between the flame detection sleeve 21 and the flame detection inlet 11.

[0033] In some embodiments, the power plant boiler 100 further includes a cold air fan (not shown in the figure), and the flame detection sleeve 21 further includes a cold air connector 214 connected to the rigid upper pipe section 212, and the cold air connector 214 is connected to the cold air fan.

[0034] The cold air generated by the cold air blower is blown into the flame detection sleeve 21 through the cold air connector 214 to cool down the flame detection sleeve 21 and the flame detection probe 22, preventing the high temperature in the furnace A from damaging the flame detection probe 22.

[0035] In some embodiments, the inner wall of the flexible tube section 213 is provided with a corrugated groove 213a. The corrugated groove 213a makes the flexible tube section 213 easier to bend and deform. On the other hand, when the cold airflow passes through the corrugated groove 213a, most of the airflow becomes a swirling flow. When this swirling flow is discharged from the lower end outlet of the rigid lower tube section 211 of the flame detector sleeve 21, it can blow air in multiple directions onto the flame detector probe 22, thereby improving the cooling effect.

[0036] It is worth noting that in the relevant technology, the inner wall of the flame detection sleeve is a continuous smooth inner surface. When cold air enters the flame detection sleeve, it flows along the continuous smooth inner surface. Most of the cold air flow discharged from the lower end outlet of the flame detection sleeve 21 is parallel to the flame detection probe 22, resulting in poor cooling effect.

[0037] In some embodiments, the inner wall of the rigid lower pipe section 211 is provided with a plurality of guide grooves 215, which are distributed circumferentially in the rigid lower pipe section 211. Each guide groove 215 is connected to the corrugated groove 213a, and each guide groove 215 extends along the axial direction of the rigid lower pipe section 211 to the lower end of the rigid lower pipe section 211.

[0038] The cooling airflow passing through the corrugated grooves 213a on the inner wall of the flexible pipe section 213 becomes a swirling flow. Part of the swirling flow is blown towards the flame detector 22, while the other part is dispersed to various guide grooves 215. After being guided by the guide grooves 215, it is blown towards the lower end of the rigid lower pipe section 211, so that more cold air can be blown towards the flame detector 22. The corrugated grooves 213a on the inner wall of the flexible pipe section 213 play a certain role in stabilizing the flow, allowing some of the swirling flow to enter the guide grooves 215 more smoothly.

[0039] In some embodiments, the cross-sectional area of ​​the guide channel 215 gradually decreases from the air inlet 215a of the guide channel 215 to the air outlet 215b of the guide channel 215.

[0040] The width of the guide channel 215 gradually decreases from the air inlet 215a to the air outlet 215b, and the depth of the guide channel 215 gradually decreases from the air inlet 215a to the air outlet 215b. This allows the airflow after being guided by the guide channel 215 to converge at the air outlet 215b, so that more airflow is blown toward the flame detector 22, thereby improving the cooling effect of the flame detector 22.

[0041] See Figure 3 The present invention also provides a flame detection sleeve 21, comprising a rigid lower tube section 211, a rigid upper tube section 212, and a flexible tube section 213. The upper end of the flexible tube section 213 is connected to the lower end of the rigid upper tube section 212. The upper end of the rigid lower tube section 211 is connected to the lower end of the flexible tube section 213. Wherein, when the flexible tube section 213 is bent, the vertical distance between the upper and lower ends of the flame detection sleeve 21 is less than the vertical distance between the upper and lower ends of the flame detection sleeve 21 when the flexible tube section 213 is straight.

[0042] This invention configures the flame detection sleeve 21 as a series of interconnected rigid lower pipe section 211, flexible pipe section 213, and rigid upper pipe section 212. The flexible pipe section 213 is bendable. When the flexible pipe section 213 is bent, the straight-line distance between the upper and lower ends of the flame detection sleeve 21 is less than the vertical distance between the upper and lower ends of the flame detection sleeve 21 when the flexible pipe section 213 is straight. This facilitates the removal of the flame detection sleeve 21 and the flame detection probe 22 together. The descaling operation of the flame detection probe 22 can be performed at the flame detection inlet 11, making descaling more convenient and thorough, ensuring the accuracy of the flame detection results, reducing the number of descaling operations, and lowering the risk to operators. In addition, since both the upper and lower parts of the flame detection sleeve 21 are rigid pipes, it is convenient for the flame detection probe 22 to be inserted into the flame detection sleeve 21. The rigid lower pipe section 211 facilitates the positioning of the flame detection probe 22 in the furnace A, and the rigid upper pipe section 212 facilitates its fixation to the boiler body 10.

[0043] In some embodiments, the flame detection sleeve 21 further includes a cold air connector 214, which is connected to the rigid upper pipe section 212; the inner wall of the flexible pipe section 213 is provided with a corrugated groove 213a; the inner wall of the rigid lower pipe section 211 is provided with a plurality of guide grooves 215, which are distributed circumferentially in the rigid lower pipe section 211, each guide groove 215 is connected to the corrugated groove 213a, and each guide groove 215 extends along the axial direction of the rigid lower pipe section 211 to the lower end of the rigid lower pipe section 211.

[0044] The corrugated groove 213a facilitates the bending and deformation of the flexible pipe section 213. When the cold airflow passes through the corrugated groove 213a, most of the airflow becomes a swirling flow. Part of the swirling flow cools the flame detector probe 22 in multiple directions at the lower end outlet of the flame detector sleeve 21. The other part of the swirling flow is dispersed to various guide grooves 215. After being guided by the guide grooves 215, it is blown towards the flame detector probe 22 at the lower end of the rigid lower pipe section 211. The corrugated groove 213a on the inner wall of the flexible pipe section 213 plays a role in stabilizing the flow, allowing part of the swirling flow to smoothly enter the guide grooves 215.

[0045] In the description of this invention, it should be understood that the 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 used only for the convenience of describing this invention 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 this invention.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A power plant boiler, characterized in that, include: The boiler body (10) includes a furnace (A) and a flame detection inlet (11). The flame detection inlet (11) is located on the top of the boiler body (10) and is connected to the furnace (A). Pipeline support (12) is provided on the boiler body (10) and is located directly above the flame detector inlet (11); and Flame detection device (20); The flame detection device (20) includes: A flame detection sleeve (21) includes a rigid lower pipe section (211), a flexible pipe section (213), and a rigid upper pipe section (212). The upper end of the flexible pipe section (213) is connected to the lower end of the rigid upper pipe section (212), and the lower end of the flexible pipe section (213) is connected to the upper end of the rigid lower pipe section (211). The rigid lower pipe section (211) and the flexible pipe section (213) are located inside the furnace (A). The rigid upper pipe section (212) is at least partially located outside the furnace (A) and is fixed to the flame detection inlet (11). A flame detector, the flame detector including a flame detection probe (22), the flame detection probe (22) being inserted into the flame detection sleeve (21), and at least a portion of the flame detection probe (22) extending from the lower end of the rigid lower pipe section (211); When the flexible pipe section (213) is bent, the vertical distance between the upper and lower ends of the flame detector sleeve (21) is less than the vertical distance between the pipeline support (12) and the flame detector inlet (11). The inner wall of the flexible pipe section (213) is provided with a corrugated groove (213a); the inner wall of the rigid lower pipe section (211) is provided with a plurality of flow guide grooves (215), the plurality of flow guide grooves (215) are distributed circumferentially in the rigid lower pipe section (211), each of the flow guide grooves (215) is connected to the corrugated groove (213a), and each of the flow guide grooves (215) extends along the axial direction of the rigid lower pipe section (211) to the lower end of the rigid lower pipe section (211).

2. The power plant boiler according to claim 1, characterized in that, The power plant boiler also includes a cooler; The flame detector sleeve (21) also includes a cold air connector (214) that is connected to the rigid upper pipe section (212) and is connected to the cold air blower.

3. The power plant boiler according to claim 1, characterized in that, The cross-sectional area of ​​the guide channel gradually decreases from the air inlet (215a) of the guide channel (215) to the air outlet (215b) of the guide channel.

4. The power plant boiler according to any one of claims 1-3, characterized in that, The flame detection device (20) also includes an external explosion-proof shell (23), a processor, and a signal line (24). The external explosion-proof shell (23) is connected to the rigid upper pipe section (212) and located outside the boiler body (10). The processor is located inside the external explosion-proof shell (23). The flame detection probe (22) is connected to the processor through the signal line (24). The signal line (24) is located inside the flame detection sleeve (21). When the flexible pipe section (213) is bent, the vertical distance between the bottom surface of the flame detection probe and the top surface of the external explosion-proof shell (23) is less than the vertical distance between the pipeline support (12) and the flame detection inlet (11).

5. The power plant boiler according to claim 4, characterized in that, The upper end of the rigid lower pipe section (211) is threadedly connected to the lower end of the flexible pipe section (213) by a first nut (216). The rigid upper pipe section (212) includes an integrally formed first pipe body (2121) and a second pipe body (2122). The lower end of the second pipe body (2122) is threadedly connected to the upper end of the flexible pipe section (213) by a second nut (217). The diameter of the first pipe body (2121) is larger than the diameter of the flame detector inlet (11), and the diameter of the second pipe body (2122) is smaller than the diameter of the flame detector inlet (11). The first pipe body (2121) is fixedly connected to the flame detector inlet.

6. The power plant boiler according to claim 5, characterized in that, The flame detection sleeve (21) also includes a sealing ring (218), which is fitted onto the second tube body (2122) and is located between the bottom of the first tube body (2121) and the flame detection inlet (11) 11.

7. A flame detection sleeve, characterized in that, include: Rigid upper pipe section (212); A flexible pipe section (213), the upper end of which is connected to the lower end of the rigid upper pipe section (212); and A rigid lower pipe section (211) is provided, the upper end of which is connected to the lower end of the flexible pipe section (213). Wherein, when the flexible tube segment (213) is bent, the vertical distance between the upper and lower ends of the flame detector sleeve (21) is less than the vertical distance between the upper and lower ends of the flame detector sleeve (21) when the flexible tube segment (213) is straightened; A cold air connector (214) is connected to the rigid upper pipe section (212); The inner wall of the flexible pipe section (213) is provided with a corrugated groove (213a). The inner wall of the rigid lower pipe section (211) is provided with a plurality of flow guide grooves (215), which are distributed circumferentially in the rigid lower pipe section (211). Each flow guide groove (215) is connected to the corrugated groove (213a), and each flow guide groove (215) extends along the axial direction of the rigid lower pipe section (211) to the lower end of the rigid lower pipe section (211).

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