A soot-blowing flow velocity measuring device suitable for thermal power plant pipelines

Abstract

The present invention relates to the field of flow velocity measurement technology, and discloses a soot-blowing flow velocity measuring device suitable for thermal power plant pipelines, including a mounting piece fixedly mounted on the outer wall of a flue gas pipeline, a display device mounted on the top of the outer wall of the mounting piece, two thermal sensors mounted inside the mounting piece, and sleeves fixedly connected to the outer walls above the detection heads of the two thermal sensors; and also includes a circuit line connecting the thermal sensor and the display device. The present invention cooperates with a cleaning component and a telescopic component, and when the data displayed on the display device changes abnormally, the telescopic component will retract the thermal sensor into the mounting piece, so that the cleaning component cleans the outer wall of the thermal sensor, so as to prevent smoke particles in the smoke from adhering to the surface of the thermal sensor to cause measurement errors, and also prevent smoke particles from corroding the thermal sensor, so that the thermal sensor can operate stably and normally, reducing operating costs.

Description

Technical Field

[0001] The invention relates to the technical field of flow velocity measurement, in particular to a soot-blowing flow velocity measuring device suitable for pipelines in thermal power plants. Background Art

[0002] The operation of thermal power plants will generate a large amount of pollutants. The soot contains many harmful substances, such as sulfur dioxide, nitrogen oxides, etc. By measuring the flow rate of soot through thermal sensors, the emission of these pollutants can be estimated, so as to better comply with environmental regulations. And by measuring the flow rate of soot, we can better understand and control the combustion efficiency of the boiler. If the soot flow rate is too fast, it may mean low combustion efficiency and fuel waste. On the contrary, if the soot flow rate is too slow, it may cause soot to accumulate in the pipeline and affect the operation of the system. Therefore, it is very necessary to measure the flow rate of soot, which can not only better monitor the emission of pollutants, but also indirectly reflect the operating status of the entire equipment.

[0003] At present, infrared method, ultrasonic method and thermal sensor method are commonly used to measure flue gas flow rate. When using the thermal sensor method to measure the flue gas flow rate, the flow rate of the flue gas is detected by two columnar sensors. However, during the detection process, particulate matter in the flue gas may adhere to the sensor to form an insulating layer, affecting the thermal conductivity of the sensor, which may cause the measurement result to be low; the particulate matter may also absorb or scatter the heat emitted by the sensor, causing the measurement result to be high, thereby affecting the accuracy of the measurement result. Summary of the invention

[0004] The object of the present invention is to provide a soot-blowing flow velocity measuring device suitable for pipelines of thermal power plants, so as to solve at least one technical problem existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides the following technical solution: a soot-blowing flow velocity measuring device suitable for a thermal power plant pipeline, comprising a mounting member fixedly mounted on the outer wall of a flue gas pipeline, a display device mounted on the top of the outer wall of the mounting member, two thermal sensors mounted inside the mounting member, and sleeves fixedly connected to the outer walls above the detection heads of the two thermal sensors;

[0006] Also included is a circuit line connecting the thermal sensor and the display device;

[0007] Also included is a telescopic assembly that allows the thermal sensor to be retracted into the mounting member and extended into the flue gas duct;

[0008] It also includes a cleaning component, and the cleaning component can clean the outer wall of the thermal sensor in the retractable mounting part.

[0009] Preferably, the telescopic assembly comprises two rotating disks respectively mounted on the inner walls of both sides of the mounting member, and the two rotating disks can rotate synchronously, and the outer walls of the two rotating disks away from the axis are connected to a pin for common rotation, and the outer walls of the pins near both ends are provided with through holes, and the two sleeves are respectively inserted into the two through holes and are rotatably connected thereto;

[0010] The telescopic assembly also includes a rotating column rotatably mounted on the inner wall of the mounting member, the top of the rotating column is fixedly connected to an upper plate, the bottom of the rotating column is fixedly connected to a lower plate, two sliding through holes are provided inside the upper plate, the rotating column and the lower plate, and the two sliding through holes are parallel to each other and pass through the axis of the rotating column, the two thermal sensors and the sleeve are respectively mounted in the two sliding through holes, and can rotate and slide in the sliding through holes;

[0011] The telescopic assembly also includes a notch provided at the connection between the mounting piece and the smoke duct and capable of allowing the lower plate to move.

[0012] Preferably, the cleaning assembly includes a third straight groove formed on the inner wall of the sliding through hole, and the third straight groove is located in the lower plate, and the outer wall of the sleeve is fixedly connected with a first protrusion, and the first protrusion can slide in the third straight groove;

[0013] The cleaning assembly also includes a sealing cavity formed in the rotating column, and the sealing cavity is communicated with the sliding through hole;

[0014] The cleaning assembly also includes an air intake assembly capable of allowing high-pressure air to enter the sealed cavity;

[0015] The cleaning assembly also includes a rotating assembly, and when the first protrusion is disengaged from the third straight groove, the rotating assembly can cause the thermal sensor to reciprocate in the sliding through hole.

[0016] Preferably, the air intake assembly includes a rotating body coaxially fixedly mounted on the end of a rotating column, two rotating plates being fixedly connected to the outer wall of the rotating body, a mounting shell being fixedly mounted on the inner wall of the mounting member, the rotating body extending into the mounting shell and being sealingly and rotatably connected thereto, two fixed plates being fixedly mounted on the inner wall of the mounting shell, the fixed plates and the rotating plates being alternately interspersed, and dividing the interior of the mounting shell into four cavities, a third pipe capable of unidirectionally intake air into the four cavities respectively is provided on the outer wall of the mounting shell, a first pipe connected to the sealed cavity is provided inside the rotating body, four second pipes connected to the four cavities respectively are also provided inside the rotating body, and the four second pipes are all connected to the first pipe, and each of the second pipes is installed with a one-way valve capable of allowing air to enter the first pipe in one direction.

[0017] Preferably, the rotating assembly includes a guide groove opened on the inner wall of the sliding through hole, and the guide groove is located in the upper plate, and the guide groove includes a second straight groove, a spiral groove and a first straight groove connected in sequence from top to bottom;

[0018] The rotating assembly also includes a second protrusion fixedly connected to the outer wall of the sleeve, and the second protrusion is slidably installed in the guide groove.

[0019] Preferably, a plurality of brushes are installed in the third straight groove.

[0020] Preferably, the inner wall of the third straight groove is provided with a plurality of wave-shaped protrusions.

[0021] Preferably, the helical angle of the spiral groove is at least 180 degrees.

[0022] Preferably, the distance between the bottom end of the thermal sensor and the lower plate is less than or equal to the distance between the bottom of the first protrusion and the bottom of the sealed cavity.

[0023] Preferably, the display device is mounted on the top of the outer wall of the mounting member via a flange.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention cooperates with the cleaning component and the telescopic component. When the data displayed on the display device shows abnormal changes, the telescopic component will retract the thermal sensor into the mounting part, so that the cleaning component can clean the outer wall of the thermal sensor to prevent smoke particles in the smoke from adhering to the surface of the thermal sensor and causing measurement errors. It can also prevent the smoke particles from corroding the thermal sensor, thereby enabling the thermal sensor to operate stably and normally, reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A perspective view of the present invention;

[0027] Figure 2 It is a front view of the present invention;

[0028] Figure 3 It is a left side cross-sectional view of the present invention;

[0029] Figure 4 It is a front cross-sectional view of the present invention;

[0030] Figure 5 It is a schematic diagram of the three-dimensional structure of the rotating column of the present invention;

[0031] Figure 6 It is a three-dimensional cross-sectional schematic diagram of the rotating column of the present invention;

[0032] Figure 7 It is a right side view of the present invention;

[0033] Figure 8 is a schematic diagram of a first protrusion and a second protrusion of the present invention;

[0034] Fig. 9 It is a partial enlarged schematic diagram of the brush of the present invention;

[0035] Fig.10 It is a partially enlarged schematic diagram of the wave-shaped protrusion of the present invention.

[0036] In the figure: 1, flue gas duct; 2, mounting part; 3, display device; 4, rotating column; 41, upper plate; 42, lower plate; 5, thermal sensor; 6, sealing chamber; 7, mounting shell; 8, rotating disk; 9, pin shaft; 10, through hole; 11, circuit line; 12, sleeve; 13, first pipe; 16, fixed plate; 17, rotating plate; 18, rotating body; 19, second pipe; 20, third pipe; 21, sliding hole; 22, second straight groove; 23, spiral groove; 24, first straight groove; 25, third straight groove; 26, first protrusion; 27, second protrusion; 28, brush; 29, wavy protrusion. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figures 1 to 10 The present invention provides a technical solution: a soot-blowing flow velocity measuring device suitable for a thermal power plant pipeline, comprising a mounting member 2 fixedly mounted on the outer wall of a flue gas pipeline 1, a display device 3 mounted on the top of the outer wall of the mounting member 2, two thermal sensors 5 mounted inside the mounting member 2, and sleeves 12 fixedly connected to the outer walls above the detection heads of the two thermal sensors 5;

[0039] Also included is a circuit line 11 connecting the thermal sensor 5 and the display device 3;

[0040] It also includes a telescopic assembly that allows the thermal sensor 5 to be retracted into the mounting member 2 and extended into the flue gas duct 1;

[0041] It also includes a cleaning component, and the cleaning component can clean the outer wall of the thermal sensor 5 in the retractable mounting part 2.

[0042] See also Figure 2 as well as Figure 4When the flue gas flows in the flue gas duct 1, it will pass through two thermal sensors 5 extending into the flue gas duct 1. The two thermal sensors 5 include a heated speed sensor and a non-heated temperature sensor. When the flowing flue gas cools the thermal sensor 5, the current passing through the sensor will increase to keep it at a constant temperature. The increased current is equivalent to the heat loss of the sensor. Therefore, the more the current increases, the higher the flue gas flow rate, and the less the current increases, the lower the flue gas flow rate. When the measurement is completed, the thermal sensor 5 will transmit the result to the display device 3 through the circuit line 11, so that the display device 3 can display the speed of the flue gas flowing in the flue gas duct 1.

[0043] The advantage of this method is that it can monitor the flue gas velocity data in real time, detect abnormal conditions in time and take measures to ensure the safe operation of the equipment. However, it should be noted that the probe of the thermal sensor 5 is placed in the flue and is more susceptible to contamination. The particles in the smoke may form an insulating layer on the surface of the thermal sensor 5, affecting the thermal conductivity of the thermal sensor 5. The thermal sensor 5 may be corroded by the smoke particles attached to the surface, and even cause damage to the thermal sensor 5. Therefore, it is particularly important to clean the surface of the thermal sensor 5.

[0044] When the data displayed on the display device 3 shows abnormal changes, the telescopic component will retract the thermal sensor 5 into the mounting member 2, so that the cleaning component can clean the outer wall of the thermal sensor 5 to prevent smoke particles in the smoke from adhering to the surface of the thermal sensor 5 and causing measurement errors. It can also prevent smoke particles from corroding the thermal sensor 5, so that the thermal sensor 5 can operate stably and normally, reducing operating costs.

[0045] Furthermore, the telescopic assembly includes two rotating disks 8 respectively mounted on the inner walls of both sides of the mounting member 2, and the two rotating disks 8 can rotate synchronously, and the outer walls of the two rotating disks 8 away from the axis are connected to the pin shaft 9 for common rotation, and the outer walls of the pin shaft 9 near both ends are provided with through holes 10, and two sleeves 12 are respectively inserted into the two through holes 10 and are rotatably connected thereto;

[0046] The telescopic assembly also includes a rotating column 4 rotatably mounted on the inner wall of the mounting member 2, an upper plate 41 is fixedly connected to the top of the rotating column 4, and a lower plate 42 is fixedly connected to the bottom of the rotating column 4. Two sliding through holes 21 are provided inside the upper plate 41, the rotating column 4, and the lower plate 42, and the two sliding through holes 21 are parallel to each other and pass through the axis of the rotating column 4. The two thermal sensors 5 and the sleeve 12 are respectively mounted in the two sliding through holes 21 and can rotate and slide in the sliding through holes 21.

[0047] The telescopic assembly also includes a slot provided at the connection between the mounting member 2 and the smoke duct 1 for allowing the lower plate 42 to move.

[0048] See also Figure 3A motor for driving the rotating disk 8 to rotate is installed on the outer wall of one side of the mounting member 2. When the thermal sensor 5 needs to be retracted into the mounting member 2, the motor drives the rotating disk 8 on one side to rotate, and the rotating disk 8 drives the pin 9 to rotate, so that the pin 9 drives the rotating disk 8 on the other side to rotate together. At the same time, the pin 9 will also drive the sleeve 12 and the thermal sensor 5 to move upward in the sliding through hole 21, thereby shrinking the thermal sensor 5 into the sliding through hole 21. When the pin 9 passes the highest point, as the rotating disk 8 continues to rotate, the pin 9 will drive the thermal sensor 5 and the sleeve 12 to move downward, gradually extending the thermal sensor 5 into the flue gas duct 1, and the thermal sensor 5 will also drive the rotating column 4 to reciprocate along the axis during the retraction and extension process in the sliding through hole 21, preparing for the subsequent cleaning work.

[0049] Furthermore, the cleaning assembly includes a third straight groove 25 formed on the inner wall of the sliding through hole 21, and the third straight groove 25 is located in the lower plate 42, and a first protrusion 26 is fixedly connected to the outer wall of the sleeve 12, and the first protrusion 26 can slide in the third straight groove 25;

[0050] The cleaning assembly further includes a sealing cavity 6 formed in the rotating column 4, and the sealing cavity 6 is connected to the sliding through hole 21;

[0051] The cleaning assembly also includes an air intake assembly capable of allowing high-pressure air to enter the sealed cavity 6;

[0052] The cleaning assembly further comprises a rotating assembly, and when the first protrusion 26 is disengaged from the third straight groove 25 , the rotating assembly can make the thermal sensor 5 reciprocate in the sliding through hole 21 .

[0053] See also Figure 6 as well as Figure 8 Under normal operation, the first protrusion 26 on the outer wall of the sleeve 12 will close the third straight groove 25 to prevent smoke from entering the sealed cavity 6 inside the rotating column 4 from the third straight groove 25. At this time, the thermal sensor 5 and the sleeve 12 are both in a vertical state, and the thermal sensor 5 extends from under the lower plate 42.

[0054] When cleaning is required, when the sleeve 12 and the thermal sensor 5 are gradually retracted into the sliding through hole 21, the first protrusion 26 on the sleeve 12 will gradually separate from the third straight groove 25 as the sleeve 12 moves upward, and enter the sealed cavity 6. In this process, the air intake component continuously injects high-pressure air into the sealed cavity 6. When the first protrusion 26 completely separates from the third straight groove 25 and enters the sealed cavity 6, the high-pressure air in the sealed cavity 6 will be quickly blown out from the third straight groove 25 to continuously blow the surface of the thermal sensor 5, so that the smoke and dust particles adhering to the surface of the thermal sensor 5 fall off and fall back into the flue gas duct 1 from the third straight groove 25 along with the high-pressure air, and the rotating component will drive the thermal sensor 5 to rotate in the sliding through hole 21. In this way, the high-speed airflow formed in the third straight groove 25 will perform a comprehensive scanning blow on the arc surface outer wall as the thermal sensor 5 rotates, so that the entire surface of the thermal sensor 5 is cleaned.

[0055] It is worth mentioning that when the thermal sensor 5 enters the lower plate 42, the outer wall of the thermal sensor 5 will be cleaned for the first time to scrape off the large particles of smoke and dust on the surface of the thermal sensor 5. Soft plastic or rubber can be installed at the entrance of the sliding through hole 21 of the lower plate 42. These materials have low friction and can avoid scratching the surface of the thermal sensor 5.

[0056] Furthermore, the air intake assembly includes a rotating body 18 coaxially fixedly mounted on the end of the rotating column 4, two rotating plates 17 are fixedly connected to the outer wall of the rotating body 18, a mounting shell 7 is fixedly mounted on the inner wall of the mounting member 2, the rotating body 18 extends into the mounting shell 7 and is sealed and rotatably connected thereto, two fixed plates 16 are fixedly mounted on the inner wall of the mounting shell 7, the fixed plates 16 and the rotating plates 17 are alternately interspersed, and the interior of the mounting shell 7 is divided into four cavities, a third pipe 20 capable of unidirectionally intake air into the four cavities is provided on the outer wall of the mounting shell 7, a first pipe 13 communicating with the sealed cavity 6 is provided inside the rotating body 18, four second pipes 19 communicating with the four cavities are also provided inside the rotating body 18, and the four second pipes 19 are all communicated with the first pipe 13, and each second pipe 19 is installed with a one-way valve capable of allowing air to enter the first pipe 13 in one direction.

[0057] See also Figure 4In the process of the thermal sensor 5 being retracted to the sliding through hole 21, the rotating column 4, the upper plate 41 and the lower plate 42 will be driven to rotate, so that the rotating column 4 drives the rotating body 18 to rotate, and then the rotating plate 17 fixedly connected to the rotating body 18 rotates. No matter which side the rotating plate 17 rotates to, it will be close to the fixed plate 16 on one side and away from the fixed plate 16 on the other side, so that one of the two adjacent cavities is in a negative pressure state and the other is in a high pressure state. The cavity in the negative pressure state inhales the outside air through the third pipe 20, and the cavity in the high pressure state presses the air inside it into the rotating body 18, and then the air enters the sealed cavity 6 through the first pipe 13. In this way, in the process of the thermal sensor 5 retracting the mounting member 2 and extending into the flue gas duct 1, high-pressure air can be continuously injected into the sealed cavity 6, so that the high-pressure air in the sealed cavity 6 can continuously purge the thermal sensor 5 through the third straight groove 25, and the surface of the thermal sensor 5 is effectively cleaned.

[0058] Further, the rotating assembly includes a guide groove formed on the inner wall of the sliding through hole 21, and the guide groove is located in the upper plate 41, and the guide groove includes a second straight groove 22, a spiral groove 23 and a first straight groove 24 which are sequentially connected from top to bottom;

[0059] The rotating assembly further includes a second protrusion 27 fixedly connected to the outer wall of the sleeve 12, and the second protrusion 27 is slidably installed in the guide groove.

[0060] See also Figure 6 as well as Figure 8 When the sleeve 12 and the thermal sensor 5 move upward in the sliding through hole 21, the first protrusion 26 on the sleeve 12 will slide in the third straight groove 25, and the second protrusion 27 on the sleeve 12 will slide in the first straight groove 24. When the first protrusion 26 disengages from the third straight groove 25 and enters the sealing chamber 6, the second protrusion 27 disengages from the first straight groove 24 and enters the spiral groove 23. When the first straight groove 24 slides in the first straight groove 24, the sleeve 12 will be driven to rotate along the axis, so that the surface of the thermal sensor 5 can be swept through the third straight groove 25, and then the thermal sensor 5 is cleaned, so that the particles adhering to the thermal sensor 5 can be effectively cleaned.

[0061] When the sleeve 12 and the thermal sensor 5 move downward and extend out in the sliding through hole 21, when the second protrusion 27 disengages from the spiral groove 23, the first protrusion 26 enters the third straight groove 25 to make the third straight groove 25 closed again, thereby preventing smoke from entering the sealing cavity 6 through the third straight groove 25.

[0062] Embodiment 1 provides an implementation method for further cleaning the surface of the thermal sensor 5 based on the above embodiment. Fig. 9 ;

[0063] A plurality of brushes 28 are installed in the third straight groove 25 .

[0064] Since the tiny smoke particles flowing in the flue gas duct 1 may be stubbornly adhered to the surface of the thermal sensor 5, it is difficult to remove the smoke particles on the surface by simple blowing. Installing a brush 28 can brush off the more stubborn smoke particles and discharge them back into the flue gas duct 1 through the high-pressure airflow in the third straight groove 25, thereby achieving a deeper level of cleaning to prevent the stubborn particles from corroding the thermal sensor 5.

[0065] Embodiment 2 provides a second implementation method for further cleaning the surface of the thermal sensor 5 based on the above embodiment. Fig.10 ;

[0066] The inner wall of the third straight groove 25 is provided with a plurality of wave-shaped protrusions 29 .

[0067] It can be seen from Example 1 that the tiny smoke particles flowing in the flue gas duct 1 may be stubbornly adhered to the surface of the thermal sensor 5. By providing a plurality of wavy protrusions 29, the high-speed airflow in the third straight groove 25 can vibrate when passing through the wavy protrusions 29, thereby driving the surface of the thermal sensor 5 to vibrate, causing the more stubborn smoke particles to fall off with the vibration, and then be re-discharged into the flue gas duct 1 along with the high-speed airflow in the third straight groove 25, thereby achieving the purpose of deeper cleaning of the surface of the thermal sensor 5.

[0068] Furthermore, the helical angle of the helical groove 23 is at least 180 degrees.

[0069] In the present case, two symmetrical third straight grooves 25 are provided in each sliding through hole 21, and the spiral angle of the spiral groove 23 is set to rotate at least 180 degrees, which can ensure that the surface of the thermal sensor 5 will be completely cleaned without dead corners, thereby preventing omissions. If there is only one third straight groove 25 provided in the sliding through hole 21, then the spiral angle of the spiral groove 23 is at least 360 degrees to avoid incomplete cleaning of the surface of the thermal sensor 5.

[0070] Furthermore, the distance between the bottom end of the thermal sensor 5 and the lower plate 42 is less than or equal to the distance between the bottom of the first protrusion 26 and the bottom of the sealed cavity 6 .

[0071] The distance between the bottom end of the thermal sensor 5 and the lower plate 42 is less than or equal to the distance from the bottom of the first protrusion 26 to the bottom of the sealed cavity 6, so that the rotating assembly and the cleaning assembly will not be started until the thermal sensor 5 completely enters the lower plate 42, so that the end of the thermal sensor 5 can be effectively cleaned to prevent the end of the thermal sensor 5 from being continuously wrapped by smoke particles and affecting its performance.

[0072] Furthermore, the display device 3 is mounted on the top of the outer wall of the mounting member 2 through a flange.

[0073] The display device 3 is mounted via a flange for easy assembly and disassembly. If an abnormality is still displayed after cleaning, the display device 3 can be removed from the top of the mounting member 2 for manual inspection to prevent damage to the display device 3.

[0074] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and the drawings can also be directly processed according to the existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0075] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soot-blowing flow velocity measuring device suitable for a thermal power plant pipeline, comprising a mounting member (2) fixedly mounted on the outer wall of a flue gas pipeline (1), characterized in that: A display device (3) is installed on the top of the outer wall of the mounting member (2), two thermal sensors (5) are installed inside the mounting member (2), and sleeves (12) are fixedly connected to the outer walls above the detection heads of the two thermal sensors (5); Also included is a circuit line (11) connecting the thermal sensor (5) and the display device (3); It also includes a telescopic assembly for retracting the thermal sensor (5) into the mounting member (2) and extending it into the smoke duct (1); It also includes a cleaning component, and the cleaning component can clean the outer wall of the thermal sensor (5) in the retracted mounting member (2); The telescopic assembly comprises two rotating disks (8) respectively mounted on the inner walls of both sides of the mounting member (2), and the two rotating disks (8) can rotate synchronously, and the outer walls of the two rotating disks (8) away from the axis are rotatably connected with a pin shaft (9) together, and the outer walls of the pin shaft (9) near both ends are provided with through holes (10), and the two sleeves (12) are respectively inserted into the two through holes (10) and are rotatably connected thereto; The telescopic assembly further comprises a rotating column (4) rotatably mounted on the inner wall of the mounting member (2); the top of the rotating column (4) is fixedly connected to an upper plate (41); the bottom of the rotating column (4) is fixedly connected to a lower plate (42); two sliding through holes (21) are provided inside the upper plate (41), the rotating column (4) and the lower plate (42); the two sliding through holes (21) are parallel to each other and pass through the axis of the rotating column (4); the two thermal sensors (5) and the sleeve (12) are respectively mounted in the two sliding through holes (21) and can rotate and slide in the sliding through holes (21); The telescopic assembly further comprises a notch provided at the connection between the mounting member (2) and the smoke duct (1) and capable of allowing the lower plate (42) to move; The cleaning assembly comprises a third straight groove (25) formed on the inner wall of the sliding through hole (21), and the third straight groove (25) is located in the lower plate (42); the outer wall of the sleeve (12) is fixedly connected with a first protrusion (26), and the first protrusion (26) can slide in the third straight groove (25); The cleaning assembly further comprises a sealing cavity (6) formed in the rotating column (4), and the sealing cavity (6) is in communication with the sliding through hole (21); The cleaning assembly also includes an air intake assembly capable of allowing high-pressure air to enter the sealed cavity (6); The cleaning assembly also includes a rotating assembly, and when the first protrusion (26) is disengaged from the third straight groove (25), the rotating assembly can cause the thermal sensor (5) to reciprocate in the sliding through hole (21).

2. The soot-blowing flow velocity measuring device suitable for thermal power plant pipelines according to claim 1 is characterized in that: The air intake assembly comprises a rotating body (18) coaxially fixedly mounted on the end of a rotating column (4); the outer wall of the rotating body (18) is fixedly connected to two rotating plates (17); the inner wall of the mounting member (2) is fixedly connected to a mounting shell (7); the rotating body (18) extends into the mounting shell (7) and is sealingly rotatably connected thereto; the inner wall of the mounting shell (7) is fixedly mounted with two fixed plates (16); the fixed plates (16) and the rotating plates (17) are alternately interlaced and divide the interior of the mounting shell (7) into four sections. The outer wall of the mounting shell (7) is provided with a third pipe (20) capable of unidirectionally inletting air into the four cavities respectively; the interior of the rotating body (18) is provided with a first pipe (13) connected to the sealing cavity (6); the interior of the rotating body (18) is further provided with four second pipes (19) respectively connected to the four cavities, and the four second pipes (19) are all connected to the first pipe (13); each of the second pipes (19) is provided with a one-way valve capable of allowing air to enter the first pipe (13) in one direction.

3. The soot-blowing flow velocity measuring device suitable for thermal power plant pipelines according to claim 1 is characterized in that: The rotating assembly comprises a guide groove formed on the inner wall of the sliding through hole (21), and the guide groove is located in the upper plate (41), and the guide groove comprises a second straight groove (22), a spiral groove (23) and a first straight groove (24) which are connected in sequence from top to bottom; The rotating assembly further comprises a second protrusion (27) fixedly connected to the outer wall of the sleeve (12), and the second protrusion (27) is slidably mounted in the guide groove.

4. The soot-blowing flow velocity measuring device suitable for thermal power plant pipelines according to claim 1 is characterized in that: A plurality of brushes (28) are installed in the third straight groove (25).

5. The soot-blowing flow velocity measuring device suitable for thermal power plant pipelines according to claim 1 is characterized in that: The inner wall of the third straight groove (25) is provided with a plurality of wave-shaped protrusions (29).

6. The soot-blowing flow velocity measuring device suitable for thermal power plant pipelines according to claim 3 is characterized in that: The spiral angle of the spiral groove (23) is at least 180 degrees.

7. The soot-blowing flow velocity measuring device suitable for thermal power plant pipelines according to claim 3 is characterized in that: The distance between the bottom end of the thermal sensor (5) and the lower plate (42) is less than or equal to the distance between the bottom of the first protrusion (26) and the bottom of the sealed cavity (6).

8. The soot-blowing flow velocity measuring device suitable for thermal power plant pipelines according to any one of claims 1 to 7, characterized in that: The display device (3) is mounted on the top of the outer wall of the mounting member (2) via a flange.

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