A large boiler exhaust smoke real-time measuring device and a measuring method thereof

Abstract

The application discloses a large boiler flue gas real-time measuring device and a measuring method thereof, and belongs to the technical field of boiler flue gas measurement. The device comprises a boiler chimney body and a cross rod arranged in the boiler chimney body. A rotary telescopic assembly is arranged on the cross rod. A flue gas detection sensor is arranged on the rotary telescopic assembly. The rotary telescopic assembly is used for rotating and telescoping to expand the detection range of the flue gas detection sensor. The flue gas detection sensor detects the flue gas of the large boiler at multiple points during movement, and transmits the detection data to a display device outside the boiler in a wireless mode. The large boiler flue gas real-time measuring device and the measuring method thereof can detect the center and the outermost side, thereby expanding the detection points and detecting multiple points in the boiler chimney body. A single motor is used for controlling the rotation and telescoping of the device, and the device can realize spiral collection of flue gas data of multiple points of the chimney, thereby avoiding power waste of multiple devices.

Description

Technical Field

[0001] This invention relates to the field of boiler flue gas measurement technology, and in particular to a real-time measurement device and method for large boiler flue gas. Background Technology

[0002] Energy conservation and consumption reduction in power plant systems are mainly concentrated on boilers and turbines. Flue gas heat loss and heat loss from incomplete combustion of solids are the most important factors affecting the thermal efficiency of power plant boilers, and are also the parts of heat loss that can be controlled by boiler combustion. Flue gas oxygen content and temperature, and fly ash carbon content are the main parameters for boiler operation, which directly determine the boiler's flue gas heat loss and heat loss from incomplete combustion of solids, thus fundamentally affecting the operating efficiency of the entire unit.

[0003] During the flue gas discharge process, a vortex effect is formed between the flue gas and the duct section of the chimney. This results in the flue gas discharge rate at the edge of the duct being lower than that at the center, and the temperature at the center being higher than that at the edge. Since the measuring equipment is located on the inner wall, the detection data is inaccurate. If you want to measure the flue gas temperature at multiple locations on the same plane, such as using the multi-representative point method, multiple measuring devices may be required for each measurement location, resulting in low efficiency and high measurement costs. Summary of the Invention

[0004] The purpose of this invention is to provide a real-time measurement device and method for flue gas from a large boiler, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a real-time measurement device for flue gas from a large boiler, comprising a boiler chimney body and a crossbar placed inside the boiler chimney body. A rotating telescopic assembly is installed on the crossbar, and a flue gas detection sensor is provided on the rotating telescopic assembly. The rotating telescopic assembly is used to expand the detection range of the flue gas detection sensor while rotating and extending. During the movement of the flue gas detection sensor, the flue gas is detected at multiple points of the large boiler, and the data is transmitted wirelessly to a display device outside the boiler.

[0006] Furthermore, the rotary telescopic assembly includes a rotary assembly, a deceleration assembly, and a telescopic assembly. One end of the rotary assembly is movably connected to the crossbar, the rotary assembly has a built-in deceleration assembly, and the telescopic assembly is connected to the other end of the rotary assembly.

[0007] Furthermore, the rotating assembly includes a high-temperature resistant motor, a drive shaft, a heat-insulating motor housing, an outer sleeve, a ring seat, and a retaining ring. The high-temperature resistant motor is housed inside the heat-insulating motor housing, which is fixed to the crossbar. The shaft of the high-temperature resistant motor passes through the crossbar and is fixed to one end of the drive shaft via a coupling.

[0008] The ring seat is fixed on the crossbar below the heat-insulating motor housing, and the ring seat is also penetrated by the drive shaft. A ring groove is machined on the outer circumference of the ring seat.

[0009] The retaining ring fixed at the top opening of the outer sleeve is arranged in the radial direction and is inserted into the annular groove for the outer sleeve to rotate around the annular groove.

[0010] Furthermore, the reduction assembly includes a reduction gear set, a support shaft, an internal gear, and an external gear. The internal gear is fixed on the transmission shaft, and the external gear is set on the inner wall of the outer sleeve. One end of multiple support shafts is inserted into the bearing of the crossbar. The reduction gear set is installed on the corresponding support shaft. The internal gear and the external gear transmit power through the reduction gear set. The power of the support shaft rotation is transmitted to the outer sleeve after speed change to drive rotation.

[0011] Furthermore, the telescopic assembly includes a left tube, a left rod, a right tube, a right rod, a limiting spring, a limiting strip, and a sealing rod. The left tube and the right tube are symmetrically arranged on both sides of the bottom end of the outer sleeve and communicate with the inside of the outer sleeve. One end of the left rod and the right rod are inserted into the left tube and the right tube respectively, and the sealing rings on the left rod and the right rod are sealed to the left tube and the right tube. The other end of the left rod and the right rod are connected to the flue gas detection sensor.

[0012] The outer sleeve has a concentric large cavity and a small cavity inside. The small cavity is connected to the left tube and the right tube respectively. The internal gear, external gear and reduction gear set are set in the large cavity. The transmission shaft extends through the large cavity to the small cavity. The inner wall of the small cavity is provided with a limit strip along the length direction. The groove on the side of the sealing rod is penetrated by the limit strip. The sealing rod is used to isolate the small cavity.

[0013] The limiting spring is set on the retaining ring on the inner wall of the small cavity above the left and right tubes.

[0014] Furthermore, the sealing rod has a structure with one end open and the other end closed. The bottom end of the drive shaft is composed of a smooth part and a threaded part, wherein the length of the smooth part is not less than cm. The interior of the sealing rod is also provided with a smooth part and a threaded part, wherein the smooth part is located at the opening of the sealing rod.

[0015] A measurement method for a real-time flue gas measurement device for a large boiler includes the following steps:

[0016] S1: After receiving the drive signal through the wiring harness, the high-temperature resistant motor drives the transmission shaft to rotate. During the rotation, the transmission shaft drives the outer sleeve's retaining ring seat to rotate through the reduction gear set.

[0017] S2: When the outer sleeve rotates, it will drive the left and right tubes to rotate simultaneously. During the rotation of the outer sleeve, the limit strip will also rotate to cooperate with the threaded part of the drive shaft, and the sealing rod will also move in the small cavity.

[0018] S3: As the sealing rod moves slowly in the direction of the flue gas detection sensor, the air pressure pushes the left and right rods to slowly extend out of the left and right pipes;

[0019] S4: As the sealing rod moves, the limiting spring is also compressed until the threads of the sealing rod and the drive shaft disengage. Then the left and right rods extend to their maximum positions, and the rotation direction of the drive shaft is the same as the thread direction of the sealing rod. Thus, the drive shaft always drives the outer sleeve to rotate.

[0020] S5: When the rotating telescopic assembly is activated, the ultra-high flue gas detection sensor follows a spiral unfolding trajectory, thereby enabling multi-point measurement of flue gas parameters emitted from the boiler chimney body and uploading the data in real time.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] This large-scale boiler flue gas real-time measurement device and its measurement method involve a sealing rod that slowly moves in the direction of the flue gas detection sensor. As the sealing rod moves, air pressure pushes the left and right rods to slowly extend out of the left and right pipes. When the rotating telescopic assembly is activated, the flue gas detection sensor spirals outwards, enabling multi-point measurement of flue gas parameters emitted from the boiler chimney and real-time data upload. After detection, a high-temperature motor drives the drive shaft to rotate in the opposite direction. During this rotation, the threaded portion of the sealing rod rotates in the opposite direction to the drive shaft, causing the sealing rod to screw into the drive shaft. This causes the sealing rod to move upwards within the large cavity, while the negative pressure in the small cavity pulls the left and right rods back into the left and right pipes. This allows for detection at both the center and the outermost point, expanding the detection range to include multiple points inside the boiler chimney. Using a single motor to control its rotation and extension enables spiral-shaped data collection from multiple points on the chimney, avoiding the waste of power from multiple devices. Attached Figure Description

[0023] Figure 1 This is a structural diagram of Embodiment 1 of the present invention;

[0024] Figure 2 This is a structural diagram of Embodiment 2 of the present invention;

[0025] Figure 3 This is an overall structural diagram of the present invention;

[0026] Figure 4 This is a diagram showing the working state of the rotary telescopic component of the present invention;

[0027] Figure 5 This is a state diagram of the rotary telescopic component of the present invention;

[0028] Figure 6 For the present invention Figure 4 Enlarged view of point A;

[0029] Figure 7 For the present invention Figure 5 Enlarged view of point B;

[0030] Figure 8 This is a diagram of the spiral trajectory of the flue gas detection sensor of the present invention.

[0031] In the diagram: 1. Boiler chimney body; 11. Horizontal bar; 2. Rotary telescopic assembly; 21. Rotary assembly; 211. High-temperature resistant motor; 212. Drive shaft; 213. Insulated motor housing; 214. Outer sleeve; 215. Ring seat; 216. Snap ring; 22. Reduction assembly; 221. Reduction gear set; 222. Support shaft; 223. Internal gear; 224. External gear; 23. Telescopic assembly; 231. Left pipe; 232. Left rod; 233. Right pipe; 234. Right rod; 236. Limiting spring; 237. Limiting strip; 238. Sealing rod; 3. Flue gas detection sensor; 4. Annular groove. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1:

[0034] Please see Figure 1 A real-time measurement device for flue gas from a large boiler includes a boiler chimney body 1 and a crossbar 11 placed inside the boiler chimney body 1. A rotating telescopic assembly 2 is installed on the crossbar 11, and a flue gas detection sensor 3 is provided on the rotating telescopic assembly 2. The rotating telescopic assembly 2 is used to expand the detection range of the flue gas detection sensor 3 by rotating and telescopically extending. During the movement of the flue gas detection sensor 3, multiple points of flue gas are detected in the large boiler, and the data is transmitted wirelessly to a display device outside the boiler. In this embodiment, the rotating telescopic assembly 2 includes a cylinder, a telescopic rod, and a servo motor. The servo motor is designed to... The cylinder is rotated by a servo motor and connected to a telescopic rod. A horizontal rod is fixed to the end of the telescopic rod. The flue gas detection sensor 3 is set on the end of the rod. The cylinder controls the rise or fall of the flue gas detection sensor 3, and the servo motor drives the flue gas detection sensor 3 to rotate. Thus, during the rotation of the flue gas detection sensor 3, multiple flue gas parameters inside the boiler chimney body 1 are measured. Compared with the first embodiment, this embodiment has a simpler structure, and the measurement trajectory is circular. The flue gas parameters located at the center of the boiler chimney body 1 cannot be accurately detected.

[0035] Example 2:

[0036] Please see Figure 3-7 The difference between this embodiment and Embodiment 1 lies in the rotating telescopic component 2. A real-time measurement device for flue gas exhaust from a large boiler includes a boiler chimney body 1 and a crossbar 11 placed inside the boiler chimney body 1. The rotating telescopic component 2 is installed on the crossbar 11, and a flue gas detection sensor 3 protrudes from the rotating telescopic component 2. The rotating telescopic component 2 is used to expand the detection range of the flue gas detection sensor 3 while rotating. During the movement of the flue gas detection sensor 3, multiple points of flue gas are detected in the large boiler, and the data is transmitted wirelessly to a display device outside the boiler. The flue gas detection sensor 3 has a built-in battery that provides power to the flue gas detection sensor 3. The flue gas parameters that the flue gas detection sensor 3 can detect include temperature and flow rate. The detected data is transmitted via 5G or Zigbee. Through the remotely transmitted data signal, the microcontroller built into the display device performs analog-to-digital conversion on the collected data signal, and uses rectification, amplification, and filtering to transmit the data to the display device. The display device displays various parameters of the flue gas in real time, making it convenient for users to observe and record.

[0037] The rotating telescopic assembly 2 includes a rotating assembly 21, a deceleration assembly 22, and a telescopic assembly 23. One end of the rotating assembly 21 is movably connected to the crossbar 11, and the deceleration assembly 22 is built into the rotating assembly 21. The telescopic assembly 23 is connected to the other end of the rotating assembly 21, and the rotating assembly 21 provides the power for the rotation and extension of the telescopic assembly 23.

[0038] The rotating assembly 21 includes a high-temperature resistant motor 211, a drive shaft 212, a heat-insulating motor housing 213, an outer sleeve 214, a ring seat 215, and a retaining ring 216. The high-temperature resistant motor 211 is housed inside the heat-insulating motor housing 213, which is fixed to the crossbar 11. The shaft of the high-temperature resistant motor 211 passes through the crossbar 11 and is fixed to one end of the drive shaft 212 via a coupling. The high-temperature resistant motor 211 can withstand temperatures above 200°C, while the flue gas temperature of large boilers is generally around 150°C. The KVM4254 model is compatible with this.

[0039] The ring seat 215 is fixed on the crossbar 11 below the heat insulation motor housing 213, and the ring seat 215 is also penetrated by the drive shaft 212. A ring groove 4 is machined on the outer circumferential surface of the ring seat 215.

[0040] The retaining ring 216 fixed at the top opening of the outer sleeve 214 is arranged in the radial direction and is inserted into the annular groove 4 for the outer sleeve 214 to rotate around the annular groove 4. The ring seat 215 is inserted into the annular groove 4 to provide support for the rotation of the outer sleeve 214 and prevent the outer sleeve 214 from falling off during rotation.

[0041] The reduction assembly 22 includes a reduction gear set 221, a support shaft 222, an internal gear 223, and an external gear 224. The internal gear 223 is fixed on the transmission shaft 212, and the external gear 224 is set on the inner wall of the outer sleeve 214. One end of multiple support shafts 222 is inserted into the bearing of the ring seat 215. The reduction gear set 221 is installed on the corresponding support shaft 222. The internal gear 223 and the external gear 224 transmit power through the reduction gear set 221. The power of the support shaft 222 is transmitted to the outer sleeve 214 after speed change to drive its rotation. The reduction gear set 221 makes the rotation speed of the outer sleeve 214 and the transmission shaft 212 different. By changing the speed of the outer sleeve 214 and the transmission shaft 212, the rotation speed of the outer sleeve 214 is reduced, thereby avoiding airflow interference caused by the excessive rotation of the flue gas detection sensor 3 during the detection process, and also avoiding the burden on the retaining ring 216 caused by the excessive rotation of the outer sleeve 214, thus extending the service life of the equipment.

[0042] The telescopic assembly 23 includes a left tube 231, a left rod 232, a right tube 233, a right rod 234, a limiting spring 236, a limiting strip 237, and a sealing rod 238. The left tube 231 and the right tube 233 are symmetrically arranged on both sides of the bottom end of the outer sleeve 214 and communicate with the interior of the outer sleeve 214. One end of the left rod 232 and the right rod 234 are inserted into the left tube 231 and the right tube 233 respectively, and the sealing rings on the left rod 232 and the right rod 234 are connected to the left tube. 231 and the right tube 233 are sealed together. The other ends of the left rod 232 and the right rod 234 are connected to the flue gas detection sensor 3. The left rod 232 and the right rod 234 are both concentric large rods and small rods connected together. The openings of the left tube 231 and the right tube 233 are provided with retaining rings along the inner diameter direction. The large rod is inserted into the left tube 231 and the right tube 233 and sealed together. The small rod passes out of the retaining ring. The retaining rings prevent the large rod from completely disengaging when it moves outward.

[0043] The outer sleeve 214 has a concentric large cavity and a small cavity inside. The small cavity is connected to the left tube 231 and the right tube 233 respectively. The internal gear 223, the external gear 224 and the reduction gear set 221 are set in the large cavity. The drive shaft 212 extends through the large cavity into the small cavity. The inner wall of the small cavity is provided with a limiting strip 237 along the length direction. The groove on the side of the sealing rod 238 is penetrated by the limiting strip 237. The sealing rod 238 is used to isolate the small cavity. The setting of the limiting strip 237 allows the sealing rod 238 to rotate along the limiting strip 237.

[0044] The limiting spring 236 is set on the retaining ring on the inner wall of the small cavity above the left tube 231 and the right tube 233, and the limiting spring 236 provides the rebound power for the sealing rod 238.

[0045] The sealing rod 238 has a structure with one end open and the other end closed. The bottom end of the drive shaft 212 is composed of a smooth part and a threaded part, wherein the length of the smooth part is not less than 5cm. The sealing rod 238 also has a smooth part and a threaded part inside, wherein the smooth part is located at the opening of the sealing rod 238.

[0046] A measurement method for a real-time flue gas measurement device for a large boiler includes the following steps:

[0047] Step 1: After receiving the drive signal through the wiring harness, the high-temperature resistant motor 211 drives the transmission shaft 212 to rotate. During the rotation, the transmission shaft 212 drives the retaining ring 216 of the outer sleeve 214 to rotate around the ring seat 215 through the reduction gear set 221.

[0048] Step 2: When the outer sleeve 214 rotates, it will drive the left tube 231 and the right tube 233 to rotate simultaneously. During the rotation of the outer sleeve 214, the limiting strip 237 will also rotate to cooperate with the threaded part of the transmission shaft 212, and the sealing rod 238 will also move in the small cavity.

[0049] Step 3: As the sealing rod 238 moves slowly in the direction of the flue gas detection sensor 3, the air pressure pushes the left rod 232 and the right rod 234 to slowly extend out of the left tube 231 and the right tube 233.

[0050] Step 4: As the sealing rod 238 moves, the limiting spring 236 is also compressed until the threads of the sealing rod 238 and the drive shaft 212 disengage. Then the left rod 232 and the right rod 234 extend to their maximum positions, and the rotation direction of the drive shaft 212 is the same as the thread direction of the sealing rod 238. Thus, the drive shaft 212 always drives the outer sleeve 214 to rotate.

[0051] Step 5: When the rotating telescopic assembly 2 is activated, the flue gas detection sensor 3 unfolds in a spiral pattern, thereby enabling multi-point measurement of the flue gas parameters discharged from the boiler chimney body 1 and uploading them in real time.

[0052] After the test is completed, the high-temperature motor 211 drives the transmission shaft 212 to rotate in the opposite direction. When the transmission shaft 212 rotates in the opposite direction, the threaded part of the sealing rod 238 is opposite to the rotation direction of the transmission shaft 212. Then the sealing rod 238 is screwed into the transmission shaft 212. The sealing rod 238 moves upward in the large cavity. Then the negative pressure in the small cavity pulls the left rod 232 and the right rod 234 into the left tube 231 and the right tube 233.

[0053] Please see Figure 8The left rod 232 and the right rod 234 extend outward or retract inward under the pressure of air, increasing the detection range. At the same time, the detection data is sent in real time during the extension process. Since the flue gas detection sensor 3 can be located, the movement trajectory of the flue gas detection sensor 3 can be viewed in real time. By drawing the trajectory and collecting the temperature at each position, various parameters of the flue gas discharged from the chimney can be marked. The double helix detection has a larger range and more accurate data.

[0054] In this embodiment, the flue gas detection sensor 3 adopts a spiral expansion, which can detect both the area near the center and the outermost edge, thereby expanding the detection points and enabling the detection of multiple points inside the boiler chimney body 1. A single motor controls its rotation and extension, enabling the spiral collection of flue gas data from multiple points on the chimney, thus avoiding the waste of power from multiple devices.

[0055] Example 3:

[0056] Please see Figure 2 The difference between this embodiment and Embodiment 1 lies in the rotating telescopic component 2. The rotating telescopic component 2 in this embodiment includes a cylinder, a telescopic rod, and a servo motor. The servo motor is mounted on the crossbar 11, and a horizontal support plate is fixed on the shaft port of the servo motor. The cylinder is mounted on the support plate and connected to the telescopic rod. The port of the telescopic rod is connected to the flue gas detection sensor 3. The servo motor drives the support plate to rotate, and during the rotation of the support plate, the cylinder drives the flue gas detection sensor 3 to extend and retract. Thus, during the rotation, the flue gas parameters inside the boiler chimney body 1 are detected at multiple points, and the detection data is more accurate. However, this detection is limited to planar detection.

[0057] In summary, the large boiler flue gas real-time measurement device and its measurement method of the present invention, when the outer sleeve 214 rotates, will drive the left pipe 231 and the right pipe 233 to rotate simultaneously. During the rotation of the outer sleeve 214, the limiting strip 237 will also rotate to cooperate with the threaded part of the transmission shaft 212, and the sealing rod 238 will also move in the small cavity. When the sealing rod 238 moves slowly in the direction of the flue gas detection sensor 3, the air pressure pushes the left rod 232 and the right rod 234 to slowly extend out of the left pipe 231 and the right pipe 233; as the sealing rod moves, the air pressure pushes the left rod 232 and the right rod 234 to slowly extend out of the left pipe 231 and the right pipe 233. During the movement of rod 238, the limiting spring 236 is also compressed until the threads of sealing rod 238 and drive shaft 212 disengage. Then, left rod 232 and right rod 234 extend to their maximum positions, and the rotation direction of drive shaft 212 is the same as the thread direction of sealing rod 238. Thus, drive shaft 212 always drives outer sleeve 214 to rotate. When the rotating telescopic assembly 2 is activated, flue gas detection sensor 3 follows a spiral unfolding trajectory, thereby realizing multi-point measurement of flue gas parameters discharged from boiler chimney body 1 and uploading them in real time. After the detection is completed, high-temperature motor 211 drives drive shaft 212 to rotate in the opposite direction. When drive shaft 212 rotates in the opposite direction, the threaded part of sealing rod 238 is opposite to the rotation direction of drive shaft 212. Then, sealing rod 238 screws into drive shaft 212, and sealing rod 238 moves upward in the large cavity. The negative pressure in the small cavity pulls left rod 232 and right rod 234 into left tube 231 and right tube 233.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A real-time measurement device for flue gas from a large boiler, characterized in that, The system includes a boiler chimney body (1) and a crossbar (11) placed inside the boiler chimney body (1). A rotating telescopic assembly (2) is installed on the crossbar (11). A flue gas detection sensor (3) is provided on the rotating telescopic assembly (2). The rotating telescopic assembly (2) is used to expand the detection range of the flue gas detection sensor (3) while rotating. The flue gas detection sensor (3) detects the flue gas of the large boiler at multiple points during its movement and transmits the data wirelessly to a display device outside the boiler. The rotating telescopic assembly (2) includes a rotating assembly ( 21) The deceleration assembly (22) and the telescopic assembly (23) are connected at one end to the crossbar (11). The deceleration assembly (22) is built into the rotating assembly (21). The telescopic assembly (23) is connected to the other end of the rotating assembly (21). The telescopic assembly (23) includes a left tube (231), a left rod (232), a right tube (233), a right rod (234), a limiting spring (236), a limiting strip (237), and a sealing rod (238). The left tube (231) and the right tube (233) are symmetrically arranged on the outer sleeve. (214) The bottom two sides are connected to the inside of the outer sleeve (214). One end of the left rod (232) and the right rod (234) are inserted into the left tube (231) and the right tube (233) respectively. The sealing rings on the left rod (232) and the right rod (234) are sealed to the left tube (231) and the right tube (233). The other end of the left rod (232) and the right rod (234) are connected to the flue gas detection sensor (3). The inside of the outer sleeve (214) is provided with a concentric large cavity and a small cavity. The small cavity is connected to the left tube (231) and the right tube (233) respectively. The large cavity is connected to the right tube (233). The internal gear (223), external gear (224) and reduction gear set (221) are arranged in the large cavity. The transmission shaft (212) extends through the large cavity to the small cavity. The inner wall of the small cavity is provided with a limiting strip (237) along the length direction. The groove on the side of the sealing rod (238) is penetrated by the limiting strip (237). The sealing rod (238) is used to isolate the small cavity. The limiting spring (236) is arranged on the retaining ring on the inner wall of the small cavity above the left tube (231) and the right tube (233).

2. The real-time measurement device for flue gas exhaust from a large boiler as described in claim 1, characterized in that, The rotating assembly (21) includes a high-temperature resistant motor (211), a drive shaft (212), a heat-insulating motor housing (213), an outer sleeve (214), a ring seat (215), and a retaining ring (216). The high-temperature resistant motor (211) is disposed inside the heat-insulating motor housing (213), which is fixed to the crossbar (11). The shaft of the high-temperature resistant motor (211) passes through the crossbar (11) and is fixed to one end of the drive shaft (212) by a coupling. The ring seat (215) is fixed on the crossbar (11) below the heat insulation motor housing (213), and the ring seat (215) is also penetrated by the drive shaft (212). A ring groove (4) is machined on the outer circumferential surface of the ring seat (215). The retaining ring (216) fixed at the top opening of the outer sleeve (214) is arranged in the radial direction, and the retaining ring (216) is inserted into the annular groove (4) for the outer sleeve (214) to rotate around the annular groove (4).

3. The real-time measurement device for flue gas exhaust from a large boiler as described in claim 2, characterized in that, The reduction assembly (22) includes a reduction gear set (221), a support shaft (222), an internal gear (223), and an external gear (224). The internal gear (223) is fixed on the transmission shaft (212), and the external gear (224) is set on the inner wall of the outer sleeve (214). One end of multiple support shafts (222) is inserted into the bearing of the ring seat (215). The reduction gear set (221) is installed on the corresponding support shaft (222). The internal gear (223) and the external gear (224) transmit power through the reduction gear set (221). The power of the support shaft (222) is transmitted to the outer sleeve (214) after speed change to drive rotation.

4. The real-time measurement device for flue gas from a large boiler as described in claim 2, characterized in that, The sealing rod (238) has a structure with one end open and the other end closed. The bottom end of the drive shaft (212) is composed of a smooth part and a threaded part, wherein the length of the smooth part is not less than 5cm. The interior of the sealing rod (238) is also provided with a smooth part and a threaded part, wherein the smooth part is located at the opening of the sealing rod (238).

5. A measurement method based on the real-time flue gas measurement device for large boilers according to any one of claims 1-4, characterized in that, Includes the following steps: S1: After receiving the drive signal through the wiring harness, the high-temperature motor (211) drives the transmission shaft (212) to rotate. During the rotation, the transmission shaft (212) drives the retaining ring (216) of the outer sleeve (214) to rotate around the ring seat (215) through the reduction gear set (221). S2: When the outer sleeve (214) rotates, it will drive the left tube (231) and the right tube (233) to rotate at the same time. During the rotation of the outer sleeve (214), the limiting strip (237) will also rotate to cooperate with the threaded part of the transmission shaft (212), and the sealing rod (238) will also move in the small cavity. S3: As the sealing rod (238) moves slowly in the direction of the flue gas detection sensor (3), the air pressure pushes the left rod (232) and the right rod (234) to slowly extend out of the left tube (231) and the right tube (233); S4: As the sealing rod (238) moves, the limiting spring (236) is also compressed until the thread of the sealing rod (238) and the thread of the drive shaft (212) disengage. Then the left rod (232) and the right rod (234) extend to their maximum positions, and the rotation direction of the drive shaft (212) is the same as the thread direction of the sealing rod (238). Thus, the drive shaft (212) always drives the outer sleeve (214) to rotate. S5: When the rotating telescopic assembly (2) is started, the trajectory of the super flue gas detection sensor (3) is spiral unfolding, thereby realizing multi-point measurement of the flue gas parameters discharged from the boiler chimney body (1) and uploading them in real time.

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