A device to improve the sensitivity of flame detection in power plant boilers

Abstract

This application relates to a device for improving the sensitivity of flame detection in power plant boilers, specifically in the field of combustion monitoring technology for thermal power plant boilers. It includes two fixed columns, one end of which is rotatably connected to the interior of a probe body. Sector gears are fixedly connected to the outer walls of both fixed columns, and these sector gears are coupled together. A micro motor is fixedly connected to one end of one of the fixed columns. A rotating column is fixedly connected to the outer wall of the fixed column, and a secondary probe is fixedly connected to the outside of the rotating column. A protective assembly is rotatably connected to the outside of the probe body. In this invention, starting the micro motor drives the fixed column to rotate, which in turn drives the rotating column and the sector gears. The two sector gears mesh, causing the two secondary probes to rotate out of the probe body for detection. When the secondary probes rotate out, they push a protective plate to rotate along a connecting block. When retracted, the protective plate adheres to the probe body due to the magnetic force of the connecting block and the magnet, thus providing protection.

Description

Technical Field

[0001] This application relates to the field of combustion monitoring technology for boilers in thermal power plants, and in particular to a device for improving the sensitivity of flame detection in power plant boilers. Background Technology

[0002] A device for improving the sensitivity of flame detection in power plant boilers is proposed. This device is based on the fusion design of multispectral sensing and intelligent algorithms. The core consists of a high-sensitivity infrared / ultraviolet composite sensor array, a signal preprocessing module, and a deep learning recognition unit. The sensor array covers the spectral range of 300-2500nm and captures flame radiation characteristics through multi-channel synchronous sampling. The preprocessing module adopts adaptive filtering and noise suppression technology to eliminate false signals such as combustion vibration and dust interference.

[0003] While some existing devices improve detection sensitivity by enhancing spectral resolution or optimizing algorithms, they have inherent limitations in detection dimensions. When biomass is co-fired in coal-fired boilers, the flame temperature field and hydrocarbon radical radiation characteristics change, making single-wavelength detection prone to misjudgment. Furthermore, the signal processing modules of these devices often use fixed threshold discrimination, lacking real-time analysis of flame dynamic characteristics. Under low load or unstable flame conditions, weak flame signals are easily missed due to noise interference, making it difficult to cope with the complex changes in the three-dimensional combustion field within the furnace.

[0004] While existing devices improve detection sensitivity through spectral optimization or algorithm upgrades, they still have significant shortcomings in multi-angle detection. Their typical structures often employ single-point or linear array sensor layouts, covering only a limited field of view directly in front of the boiler burner. When the flame is deflected due to factors such as uneven air distribution or coal quality fluctuations, the sensor is prone to detection delays due to blind spots. To address these issues, a device for improving the flame detection sensitivity of power plant boilers is proposed. Utility Model Content

[0005] The purpose of this application is to provide a device for improving the sensitivity of flame detection in power plant boilers, aiming to address the problem that existing detection equipment cannot detect from multiple angles.

[0006] The device for improving the flame detection sensitivity of power plant boilers provided in this application adopts the following technical solution:

[0007] A device for improving the sensitivity of flame detection in power plant boilers includes a probe body, a multi-angle detection mechanism fixedly connected inside the probe body, a cooling mechanism fixedly connected outside the probe body, and a dustproof mechanism provided outside the probe body.

[0008] The multi-angle detection mechanism includes two fixed columns, one end of which is rotatably connected to the inside of the probe body. A sector gear is fixedly connected to the outer wall of each of the two fixed columns, and the two sector gears are coupled together. A micro motor is fixedly connected to one end of one of the fixed columns. A rotating column is fixedly connected to the outer wall of the fixed column. A secondary probe is fixedly connected to the outside of the rotating column. A protective component is rotatably connected to the outside of the probe body.

[0009] The above technical solution involves a multi-angle detection mechanism comprising two fixed columns, one end of which is rotatably connected to the inside of the probe body to form a stable support structure. Both fixed columns have sector gears on their outer walls, which are coupled together to achieve synchronous reverse movement. One end of one fixed column is connected to a micro motor to provide precise driving force. The rotating column on its outer wall rotates synchronously with the fixed column, driving the external sub-probe to adjust its angle. The protective components on the outside of the probe body can be rotated to open and close, forming a protective shell to resist dust and collisions, extending the equipment's lifespan. Through gear linkage, the detection efficiency and equipment durability are significantly improved.

[0010] As a further description of the above technical solution:

[0011] The dustproof mechanism includes a dustproof cover, a spring is fixedly connected inside the dustproof cover, a sliding column is fixedly connected to one end of the spring, and multiple locking blocks are fixedly connected to the outside of the probe body.

[0012] The above technical solution includes a dust cover with a bowl-shaped structure, on which multiple sets of springs are evenly distributed on the inner wall. The free ends of the springs are fixedly connected to the sliding column. Four trapezoidal locking blocks are evenly distributed on the outside of the probe body along the circumferential direction. This elastic buckle structure not only ensures the sealing of the dust cover, but also enables quick disassembly and facilitates maintenance.

[0013] As a further description of the above technical solution:

[0014] The cooling mechanism includes a cooler fan, which is connected to a cooling pipe, and a cooling hose is fixed to the outside of the probe body.

[0015] The above technical solution includes a cooling fan with its outlet sealed to a cooling pipe. The cooling pipe uses an aluminum alloy microchannel structure, which can quickly conduct heat. The probe body has a cooling hose on the outside, ensuring stable operation of the equipment in a high-temperature environment.

[0016] As a further description of the above technical solution:

[0017] The protective assembly includes a protective plate, a connecting block fixedly connected to the outside of the protective plate, and a magnet fixedly connected to the outside of the probe body.

[0018] The above technical solution includes an arc-shaped protective plate with a connecting block fixedly connected to its outer side, which can be rotatably hinged to the probe body. A ring magnet is embedded on the inner side of the protective plate corresponding to the position of the probe body, forming a magnetic adsorption structure with the magnetic block on the outside of the body. When the protective plate is closed, the strong magnetic force generated by the magnet ensures that the protective plate fits tightly.

[0019] As a further description of the above technical solution:

[0020] A lens is fixedly connected inside the probe body, and a rear housing is fixedly connected to one end of the probe body.

[0021] The above technical solution involves fixing a high-precision optical lens in the center inside the probe body, connecting an image sensor to the rear end of the lens, and fixing one end of the main body to the rear housing.

[0022] As a further description of the above technical solution:

[0023] A circuit board is fixedly connected inside the rear housing, and a UV photosensitive tube is fixedly connected to the outside of the circuit board.

[0024] The above technical solution involves fixing a circuit board inside the rear housing, coating its surface with conformal coating to enhance protection, vertically welding a high-sensitivity UV photosensitive tube to the edge of the circuit board, and using a vacuum-sealed structure for accurate detection.

[0025] As a further description of the above technical solution:

[0026] The probe body is slidably connected to the boiler wall, and the other end of the cooling hose is fixedly connected to the outside of the rear housing.

[0027] The above technical solution involves a wear-resistant sliding sleeve on the outer wall of the probe body, which can slide along the guide rail on the inner side of the boiler wall for detection. The other end of the cooling hose is fixed to the quick-connect interface on the side of the rear box through a connector, which removes heat from the lens and circuit board, ensuring stable operation of the equipment under harsh working conditions.

[0028] As a further description of the above technical solution:

[0029] The bottom of the micro motor is fixedly connected to the inside of the probe body, the outer wall of the sub-probe is slidably connected to the inside of the probe body, and the inside of the sub-probe is in contact with the inner wall of the protective plate.

[0030] The above technical solution involves fixing a micro motor to the inner wall of the probe body and connecting the output shaft to the fixed column to ensure smooth power transmission. This allows the secondary probe to rotate smoothly under the drive of the sector gear. When the protective plate is closed, it effectively prevents dust from entering. The micro motor drives the secondary probe to rotate and push the protective plate open.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. When it is necessary to detect complex flames or lens damage, start the micro motor to drive the fixed column to rotate, which drives the rotating column and the sector gear. The two sector gears mesh to make the two auxiliary probes rotate synchronously and rotate out of the probe body for detection. When the auxiliary probe rotates out, it pushes the protective plate to rotate along the connecting block. When it retracts, the protective plate adheres to the probe body due to the magnetic force of the connecting block and the magnet, realizing the linkage protection of the auxiliary probe's extension and retraction detection and the protective plate.

[0033] 2. Insert the probe body into the mounting hole in the boiler wall. The front lens detects the flame, and the data is transmitted to the circuit board via the UV photosensitive tube. Dust generated by the flame combustion can easily cover the boiler wall and affect the detection. Therefore, a dust cover is connected to the outside of the boiler wall. After the locking block outside the probe body is aligned with the slot inside the dust cover, it is rotated. The locking block squeezes the sliding column to compress the spring and generate elastic potential energy. Then the spring pushes the sliding column to lock the outer wall of the locking block to complete the fixation, so that the dust cover can play the role of blocking dust and ensuring a clean detection environment. Attached Figure Description

[0034] Figure 1 This is a three-dimensional schematic diagram of a device for improving the flame detection sensitivity of a power plant boiler, as proposed in this utility model.

[0035] Figure 2 This is a schematic diagram of the probe body of a device for improving the sensitivity of flame detection in power plant boilers, as proposed in this utility model.

[0036] Figure 3 for Figure 2 Enlarged view of point A in the middle

[0037] Figure 4 A schematic diagram of the protective plate of a device for improving the flame detection sensitivity of a power plant boiler, as proposed in this utility model;

[0038] Figure 5 for Figure 4 Enlarged view at point B

[0039] Figure 6 This is a schematic diagram of the rear casing of a device for improving the flame detection sensitivity of a power plant boiler, as proposed in this utility model.

[0040] Explanation of reference numerals in the attached diagram: 1. Probe body; 2. Boiler wall; 3. Cooling mechanism; 31. Air cooler; 32. Cooling pipe; 33. Cooling hose; 4. Rear housing; 5. Circuit board; 6. UV phototube; 7. Lens; 8. Multi-angle detection mechanism; 81. Micro motor; 82. Fixing column; 83. Sector gear; 84. Rotating column; 85. Secondary probe; 86. Protective components; 861. Protective plate; 862. Connecting block; 863. Magnet; 9. Dustproof mechanism; 91. Dust cover; 92. Spring; 93. Sliding column; 94. Locking block. Detailed Implementation

[0041] The following is in conjunction with the appendix Figure 1 -Appendix Figure 6 This application will be described in further detail below.

[0042] Example: A device for improving the sensitivity of flame detection in power plant boilers, referring to... Figure 2 , Figure 3 and Figure 6 The device includes a probe body 1, with a multi-angle detection mechanism 8 fixedly connected inside the probe body 1. The multi-angle detection mechanism 8 is fixed inside the probe body 1 and precisely controls the rotation speed and angle. A cooling mechanism 3 is fixedly connected outside the probe body 1 and generates cooled air to cool the detection element in a high-temperature environment. A dustproof mechanism 9 is provided outside the probe body 1, covering the outside of the probe body 1. It is made of high-temperature resistant material and has a light-transmitting hole at the top to block dust intrusion while allowing the flame signal to pass through.

[0043] Specifically, the multi-angle detection mechanism 8 precisely controls the rotation speed and angle within the probe body 1 to achieve multi-directional detection. The cooling mechanism 3 generates cooling air outside the probe body 1 to cool the detection element. The dustproof mechanism 9 covers the outside, and its high-temperature resistant material and light-transmitting hole design can block dust and allow flame signals to pass through, thereby improving detection sensitivity.

[0044] The multi-angle detection mechanism 8 includes two fixed columns 82, which serve as the support and rotation core. One end of each fixed column 82 is rotatably connected to the inside of the probe body 1. One of the fixed columns 82 is rotatably connected to the probe body 1 through a structure such as a bearing. A sector gear 83 is fixedly connected to the outer wall of each of the two fixed columns 82. The sector gear 83 rotates synchronously with the fixed column 82. The two sector gears 83 are coupled together and transmit power through gear meshing. When one sector gear 83 rotates, it drives the other sector gear 83 to rotate in the opposite direction, so that the two fixed columns 82 move in coordination at a specific angle. A micro motor 81 is fixedly connected to one end of one of the fixed columns 82. The micro motor 81 serves as the power source and is fixed to one end of one of the fixed columns 82 to drive the fixed column 82 to rotate. A rotating column 84 is fixedly connected to the outer wall of the fixed column 82. The rotating column 84 rotates synchronously with the fixed column 82. A secondary probe 85 is fixedly connected to the outside of the rotating column 84. The secondary probe 85 rotates together with the rotating column 84. A protective component 86 is rotatably connected to the outside of the probe body 1.

[0045] Specifically, when the device is working, the micro motor 81 drives the fixed column 82 connected to it to rotate. The sector gear 83 on the outer wall of the fixed column 82 rotates accordingly. Through gear meshing, it drives another sector gear 83 to rotate in the opposite direction, so that the two fixed columns 82 move in coordination at a specific angle. When the fixed column 82 rotates, it drives the rotating column 84 to rotate, which in turn causes the sub-probe 85 to rotate around the probe body 1, expanding the detection range. At the same time, the protective component 86 on the outside of the probe body 1 also rotates accordingly, which plays a protective role when the sub-probe 85 is working, avoiding its influence by external factors, thereby improving the sensitivity of flame detection in power plant boilers.

[0046] The cooling mechanism 3 includes a cold air blower 31, which is the core power source of the cooling mechanism 3. The cold air blower 31 is equipped with a cooling pipe 32, and the low-temperature airflow is delivered to the probe body 1 through the cooling pipe 32. A cooling hose 33 is fixed to the outside of the probe body 1.

[0047] Specifically, when the cooling mechanism 3 is working, the air cooler 31 generates a low-temperature airflow as a power source. The airflow is delivered to the probe body 1 through the cooling pipe 32 to cool it down. The cooling hose 33 outside the probe body 1 assists in delivering the low-temperature airflow to ensure uniform cooling effect. Through continuous cooling, the probe body 1 is kept at a suitable working temperature to ensure stable operation of the flame detection device.

[0048] The protective assembly 86 includes a protective plate 861, which is the core component of the protective assembly 86. It covers the outside of the auxiliary probe 85 and blocks the direct impact of high-temperature flue gas, dust, and flame radiation inside the boiler on the probe. A connecting block 862 is fixedly connected to the outside of the protective plate 861 and serves as the connection interface between the protective plate 861 and the probe body 1. A magnet 863 is fixedly connected to the outside of the probe body 1. The magnet 863 is connected to the protective plate 861 by magnetic force, so that the protective plate 861 and the probe body 1 fit tightly together.

[0049] Specifically, when the protective component 86 is working, the protective plate 861 covers the outside of the auxiliary probe 85, blocking the impact of high-temperature flue gas, dust and flame radiation inside the boiler. The protective plate 861 is magnetically connected to the magnet 863 outside the probe body 1 through the connecting block 862, so that the protective plate 861 fits tightly against the probe body 1, forming a protective barrier and ensuring that the auxiliary probe 85 works stably in harsh environments.

[0050] The bottom of the micro motor 81 is fixedly connected to the inside of the probe body 1. The micro motor 81 serves as a power source and is fixed to the bottom plate inside the probe body 1 to ensure the stability of the motor during operation. The outer wall of the auxiliary probe 85 is slidably connected to the inside of the probe body 1, allowing the auxiliary probe 85 to extend into or retract from the boiler. The inside of the auxiliary probe 85 is in contact with the inner wall of the protective plate 861. The auxiliary probe 85 rotates outward to push the protective plate 861 to rotate.

[0051] Specifically, the micro motor 81 is fixed to the bottom plate inside the probe body 1. When it is running, it drives the auxiliary probe 85 to rotate. The outer wall of the auxiliary probe 85 is slidably connected to the inner wall of the probe body 1. When it rotates, it can extend into or out of the boiler. Its outer wall pushes the protective plate 861 to rotate synchronously, so that the protective plate 861 moves with the auxiliary probe 85, providing protection when it extends into the boiler and retracting when it exits.

[0052] Reference Figure 1 , Figure 4 and Figure 5 The dustproof mechanism 9 includes a dust cover 91, which covers the outside of the probe body 1 to prevent particulate pollutants such as dust and soot from entering the probe detection area and affecting the accuracy of the detection signal. A spring 92 is fixedly connected inside the dust cover 91. A sliding column 93 is fixedly connected to one end of the spring 92. One end of the spring 92 is connected to the inner wall of the dust cover 91, and the other end is connected to the sliding column 93 to provide elastic restoring force. Multiple locking blocks 94 are fixedly connected to the outside of the probe body 1. The locking blocks 94 are evenly fixed to the outside of the probe body 1 and cooperate with the locking slots of the dust cover 91 to realize the quick replacement of the dust cover 91.

[0053] Specifically, when the dustproof mechanism 9 is working, the dust cover 91 covers the outside of the probe body 1 to prevent dust and soot from entering the detection area. The internal spring 92 is connected to the sliding column 93 to provide elastic restoring force, so that the dust cover 91 is tightly attached to the probe body 1. The locking block 94 outside the probe body 1 cooperates with the slot of the dust cover 91 to facilitate quick replacement of the dust cover 91 and ensure the dustproof effect.

[0054] The probe body 1 is internally fixedly connected to a lens 7, which is used to focus the light signal of the boiler flame so that it is accurately projected onto the subsequent photoelectric sensor to ensure the clarity and stability of the detection signal. One end of the probe body 1 is fixedly connected to a rear housing 4.

[0055] Specifically, the lens 7 inside the probe body 1 focuses the light signal of the boiler flame, so that it is accurately projected onto the photoelectric sensor to ensure that the detection signal is clear and stable. The rear housing 4 at one end of the probe can process the light signal received by the sensor and convert it into an electrical signal that is easy to transmit and analyze, so as to realize the flame detection function.

[0056] The rear housing 4 has a circuit board 5 fixedly connected inside, and a UV phototube 6 fixedly connected outside the circuit board 5. The circuit board 5 integrates electronic components such as signal amplification circuit, analog-to-digital conversion chip, and microprocessor. It receives the electrical signal transmitted by the UV phototube 6, performs filtering, amplification, and calculation processing, determines the existence state, intensity, and fluctuation characteristics of the flame, and then transmits the results to the external control system through a cable.

[0057] Specifically, the UV photosensitive tube 6 on the circuit board 5 inside the rear housing 4 receives the ultraviolet light signal from the flame and converts it into an electrical signal. The amplifier circuit, analog-to-digital converter chip and microprocessor integrated on the circuit board 5 filter, amplify and calculate the signal to determine the flame state, intensity and fluctuation, and transmit the results to the external control system through a cable.

[0058] The probe body 1 is slidably connected to the boiler wall 2. The boiler wall 2 has a through mounting hole. The probe body 1 extends into the boiler through the hole via the slid connection. It can slide along the axis to adjust the depth of the probe into the boiler, adapting to the burner position or flame detection area requirements of different boilers. The other end of the cooling hose 33 is fixedly connected to the outside of the rear housing 4. The cooling hose 33 introduces the low-temperature cooling medium into the rear housing 4 to dissipate heat from components such as the circuit board 5 and the UV phototube 6.

[0059] Specifically, the probe body 1 extends into the boiler through the mounting hole in the boiler wall 2, and the insertion depth can be adjusted by sliding along the axis to adapt to different burner positions. The cooling hose 33 introduces the low-temperature medium into the rear housing 4 to dissipate heat from internal components such as the circuit board 5 and UV phototube 6, ensuring their stable operation in high-temperature environments.

[0060] The implementation principle of this application embodiment is as follows: The probe body 1 is inserted into the interior of the boiler wall 2. The flame is detected through the lens 7 at the front end of the probe body 1. The data is transmitted to the circuit board 5 through the UV photosensitive tube 6. The front end of the probe body 1 detects the flame. When the flame burns, it will produce dust, which will cover the boiler wall 2 and affect the detection of the boiler wall 2. A dust cover 91 is connected to the outside of the boiler wall 2. Multiple locking blocks 94 are fixed to the outside of the probe body 1. A spring 92 is fixed inside the dust cover 91. There is a slot inside the dust cover 91. The slot of the dust cover 91 is aligned with the locking block 94. The dust cover 91 is rotated to lock the locking block 94 into the slot of the dust cover 91. The locking block 94 presses the sliding column 93. The sliding column 93 presses the spring 92. The spring 92 generates elastic potential energy and pushes the sliding column 93 to be locked on the outer wall of the locking block 94 for fixation. The dust cover 91 blocks the ash.

[0061] When complex flame conditions need to be detected or lens 7 is damaged, the micro motor 81 is activated. The micro motor 81 drives the fixed column 82 to rotate, which in turn drives the rotating column 84 and the sector gear 83 to rotate. The two sector gears 83 mesh, causing the two auxiliary probes 85 to rotate synchronously. The auxiliary probes 85 rotate out of the probe body 1 for detection. When the auxiliary probes 85 rotate out, they push the protective plate 861 to rotate along the connecting block 862. When the auxiliary probes 85 retract into the probe body 1, the protective plate 861 is in contact with the magnet 863. The connecting block 862 holds the protective plate 861 to the probe body 1 due to magnetic force. The probe body 1 is in contact with the flame inside, and the heat may damage lens 7. The cooling fan 31 is activated. The cooling fan 31 cools the probe body 1 through the cooling pipe 32. At the same time, the probe body 1 is connected to the outside of the cooling hose 33, which transmits cold air to the inside of the rear box 4 to cool the circuit board 5 and the UV phototube 6.

[0062] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. A device for improving the sensitivity of flame detection in power plant boilers, comprising a probe body (1), characterized in that: The probe body (1) is internally fixedly connected to a multi-angle detection mechanism (8), the probe body (1) is externally fixedly connected to a cooling mechanism (3), and the probe body (1) is externally provided with a dustproof mechanism (9). The multi-angle detection mechanism (8) includes two fixed columns (82), one end of which is rotatably connected to the inside of the probe body (1). A sector gear (83) is fixedly connected to the outer wall of each of the two fixed columns (82), and the two sector gears (83) are coupled together. A micro motor (81) is fixedly connected to one end of one of the fixed columns (82). A rotating column (84) is fixedly connected to the outer wall of the fixed column (82). A secondary probe (85) is fixedly connected to the outside of the rotating column (84). A protective component (86) is rotatably connected to the outside of the probe body (1).

2. The device for improving the flame detection sensitivity of power plant boilers according to claim 1, characterized in that: The dustproof mechanism (9) includes a dust cover (91), a spring (92) is fixedly connected inside the dust cover (91), a sliding column (93) is fixedly connected to one end of the spring (92), and multiple locking blocks (94) are fixedly connected to the outside of the probe body (1).

3. The device for improving the flame detection sensitivity of power plant boilers according to claim 1, characterized in that: The cooling mechanism (3) includes a cooler (31), the cooler (31) is equipped with a cooling pipe (32), and a cooling hose (33) is fixed to the outside of the probe body (1).

4. The device for improving the flame detection sensitivity of power plant boilers according to claim 3, characterized in that: The protective component (86) includes a protective plate (861), a connecting block (862) is fixedly connected to the outside of the protective plate (861), and a magnet (863) is fixedly connected to the outside of the probe body (1).

5. The device for improving the flame detection sensitivity of power plant boilers according to claim 4, characterized in that: The probe body (1) is fixedly connected to a lens (7), and a rear box (4) is fixedly connected to one end of the probe body (1).

6. The device for improving the flame detection sensitivity of power plant boilers according to claim 5, characterized in that: A circuit board (5) is fixedly connected inside the rear housing (4), and a UV photosensitive tube (6) is fixedly connected outside the circuit board (5).

7. The device for improving the flame detection sensitivity of power plant boilers according to claim 5, characterized in that: The probe body (1) is slidably connected to the boiler wall (2), and the other end of the cooling hose (33) is fixedly connected to the outside of the rear box (4).

8. The device for improving the flame detection sensitivity of power plant boilers according to claim 4, characterized in that: The bottom of the micro motor (81) is fixedly connected to the inside of the probe body (1), the outer wall of the sub-probe (85) is slidably connected to the inside of the probe body (1), and the inside of the sub-probe (85) is in contact with the inner wall of the protective plate (861).

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