Real-time monitoring equipment for flue gas flow of chimney

Abstract

The invention discloses chimney flue gas flow real-time monitoring equipment, and relates to the technical field of flue gas flow measurement, the chimney flue gas flow real-time monitoring equipment comprises a flow monitoring mechanism, a pitot tube probe mechanism and a controller, one end of the flow monitoring mechanism is fixedly connected with one end of the pitot tube probe mechanism, and the pitot tube probe mechanism comprises a support rod and a probe tube. According to the invention, the dust blowing mechanism and the automatic cleaning mechanism are arranged, dry compressed air is used for reversely blowing the pressure sensing holes, and the cleaning assembly is matched to blow and brush the plurality of pressure sensing holes and regularly self-clean the plurality of pressure sensing holes of the probe tube, so that dust is prevented from being attached to the inner walls of the holes for a long time, and differential pressure signal distortion caused by blockage of the pressure sensing holes is avoided; manual regular disassembly is not needed, the operation and maintenance period is prolonged, the operation and maintenance cost is reduced, when a differential pressure signal monitored by the differential pressure sensor is suddenly reduced, the emergency cleaning module triggers the automatic cleaning mechanism and the dust blowing mechanism to achieve an emergency cleaning mode, the cleaning time is prolonged, and the pressure sensing hole is automatically cleaned.

Description

Technical Field

[0001] This invention relates to the field of flue gas flow measurement technology, specifically to a real-time monitoring device for flue gas flow in a chimney. Background Technology

[0002] In industrial production, chimneys serve as the main channels for flue gas emission. The flow rate of the flue gas emitted from chimneys is one of the important indicators for measuring the total amount of pollutants emitted by enterprises, and it is also a key parameter for environmental protection departments to conduct environmental supervision. Currently, the commonly used chimney flue gas flow monitoring equipment on the market mainly includes Pitot tube type, ultrasonic type, and thermal type.

[0003] For example, Chinese patent CN119394385A describes a traceable flue gas flow measurement system and method for a large-diameter chimney, comprising: a tracer gas cylinder for holding tracer; a flow controller for controlling the output flow rate of the tracer; a tracer injection probe, through which the tracer output from the flow controller is injected into the upstream position of the chimney pipe to mix with the flue gas; a tracer sampling probe, installed at the downstream position of the chimney pipe, for extracting a sample of the mixed gas by a gas pump; and a gas analyzer for analyzing the obtained gas sample and calculating the volumetric flow rate of the flue gas in the chimney pipe.

[0004] Existing pitot tube monitoring equipment has many problems in practical applications. It requires inserting the probe into the chimney. After long-term use, the surface of the pressure sensing hole of the probe is easily covered by pollutants such as dust and oil in the flue gas. Or, due to the sudden drop in flue gas temperature, water vapor condenses and combines with dust to form "wet ash," which blocks the pressure sensing hole. This makes it impossible to accurately collect the total pressure / static pressure, resulting in a pressure difference measurement value that is too small or zero. The measurement accuracy drops significantly, and the calculated flue gas flow rate is seriously low, rendering it meaningless for monitoring. Moreover, it requires frequent disassembly and cleaning by relevant personnel, which not only increases maintenance costs but also affects the continuity of monitoring. Summary of the Invention

[0005] The purpose of this invention is to provide a real-time monitoring device for chimney flue gas flow to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a real-time monitoring device for flue gas flow in a chimney, comprising a flow monitoring mechanism, a pitot tube probe mechanism, and a controller. One end of the flow monitoring mechanism is fixedly connected to one end of the pitot tube probe mechanism. The pitot tube probe mechanism includes a support rod and a probe tube. One end of the probe tube is fixedly connected to the support rod, and the other end of the probe tube is provided with a total pressure hole. Static pressure holes are symmetrically arranged on the side wall of the probe tube. The inner walls of the total pressure hole and the static pressure hole are coated with polytetrafluoroethylene. A temperature sensor and a differential pressure sensor are installed inside the probe tube. A dust blowing mechanism is installed on one side of the pitot tube probe mechanism. The dust blowing mechanism includes a compressed air tank and a blowing pipe. One end of the blowing pipe is connected to the compressed air tank. The other end of the blowing pipe is inserted into the probe tube and symmetrically connected to two thin tubes. A thin tube is fixed between the two thin tubes. One end of the thin tubes is connected to the static pressure hole and the total pressure hole, respectively. An automatic cleaning mechanism is installed on the top of the probe tube. The automatic cleaning mechanism includes a triangular plate, a micro motor, a toothed chain, and a flipping mechanism that enables the triangular plate to flip. The output end of the micro motor is fixedly connected to a bevel gear one. One end of the triangular plate is fixedly mounted with a mounting rod, and one end of the mounting rod is rotatably mounted to the top of the probe tube. Gear rods are rotatably mounted at the bottom of the three corners of the triangular plate, and cleaning components are welded to the bottom of the gear rods. The outer walls of the tops of multiple gear rods mesh with the toothed chain. One gear rod has a bevel gear two welded to its top, and the top of the bevel gear two meshes with one end of the bevel gear one.

[0007] Preferably, the cleaning component includes a vertical rod, the outer wall of which has a plurality of grooves arranged in a ring array, and a cleaning plate is disposed in the groove. One side of the cleaning plate is rotatably connected to a parallel movable arm, and the other side of the cleaning plate is fixedly connected to a cleaning brush. One end of the movable arm is rotatably installed with the bottom of the groove.

[0008] Preferably, the flipping mechanism includes an electric push rod and a rotating rod. The output end of the electric push rod is rotatably mounted to one end of the rotating rod, and the other end of the rotating rod is rotatably connected to a slider. The slider is slidably mounted inside the mounting rod. The micro motor is fixedly mounted on the top of the triangular plate, and the electric push rod is fixedly mounted on the top of the probe tube.

[0009] Preferably, a filter screen is installed inside the end of the thin tube one connected to the static pressure hole and the end of the thin tube two connected to the total pressure hole. The probe tube is provided with a total pressure tube and a static pressure tube. One end of the total pressure tube is connected to the total pressure hole and one end of the static pressure tube is connected to the static pressure hole.

[0010] Preferably, the support rod is equipped with a total pressure outlet pipe and a static pressure outlet pipe inside, a directional rod is fixedly installed on the outside of the support rod, and a solenoid valve is provided at one end of the air blowing pipe.

[0011] Preferably, the flow monitoring mechanism includes a differential pressure transmitter, a three-valve manifold, and a mounting base. The differential pressure transmitter and the mounting base are respectively fixedly installed at both ends of the three-valve manifold, and a monitoring tube is welded to one end of the mounting base.

[0012] Preferably, an assembly housing is fixedly installed on the outside of the flow monitoring mechanism, and the controller and compressed air tank are fixedly installed on both sides of the assembly housing, with a door panel rotatably installed on the front side of the assembly housing.

[0013] Preferably, a real-time flue gas flow monitoring system is used, which includes a Pitot tube monitoring unit, a self-cleaning unit, a data acquisition and processing unit, and a remote monitoring unit. The Pitot tube monitoring unit collects flue gas temperature data through a temperature sensor to provide temperature compensation for flow calculation, and collects total pressure and static pressure data of flue gas through a differential pressure sensor, and converts the difference between total pressure and static pressure into an electrical signal output. The self-cleaning unit periodically cleans the static pressure port and the main pressure port through a dust blowing mechanism and an automatic cleaning mechanism; The data acquisition and processing unit is used to receive monitoring signals from the pitot tube monitoring unit and perform flow calculations; The remote monitoring unit enables remote transmission, storage, and management of data. The wireless transmission module uses 5G / LoRa communication to transmit real-time monitoring data and historical data to the cloud server. The cloud data platform has functions such as data display, data export, anomaly alarm, device management, and data sharing. The local display terminal uses a touch screen to display monitoring data and device status in real time.

[0014] Preferably, the self-cleaning unit includes a compressed air storage module, a timed cleaning module, and an emergency cleaning module; The compressed air storage module uses a compressed air storage tank to store clean, dry compressed air and ensure a stable air supply. In the timed cleaning module, the solenoid valve, micro motor and electric push rod are electrically connected. The cleaning cycle and cleaning duration of the automatic cleaning mechanism are set by the controller. The controller opens the solenoid valve, micro motor and electric push rod at timed intervals. The compressed air tank sprays compressed air into the static pressure hole and the total pressure hole through the thin tube one and thin tube two. The electric push rod drives the triangular plate to flip to be parallel with the probe tube. The micro motor drives the three cleaning components to rotate, realizing self-cleaning. In the emergency cleaning module, when the differential pressure sensor detects an abnormal differential pressure signal, it triggers the automatic cleaning mechanism and the dust blowing mechanism to achieve emergency cleaning mode.

[0015] Preferably, the data acquisition and processing unit includes a data acquisition module, a data processing module, a fault diagnosis module, and a storage module; The data acquisition module collects raw differential pressure data, raw temperature data, and flue gas humidity data through the processor for density compensation. The data processing module incorporates temperature, humidity, and atmospheric pressure to dynamically compensate for flue gas density, and calculates the real-time flue gas flow rate based on the ideal gas law and flue gas flow rate calculation formula. The fault diagnosis module monitors the output signals of each sensor in real time. When the differential pressure signal remains unchanged for 3 minutes, the temperature sensor output exceeds the measurement range, or the compressed air tank supply is abnormal, a fault alarm is triggered. The storage module is used to store real-time monitoring data and historical data.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, by incorporating a filter and a polytetrafluoroethylene coating inside the probe tube, large dust particles are prevented from entering and dust adhesion is reduced. By setting up a dust blowing mechanism and an automatic cleaning mechanism, dry compressed air is used to back-blow the pressure sensing holes. At the same time, the cleaning component can blow and brush multiple pressure sensing holes, and the multiple pressure sensing holes of the probe tube are self-cleaned at regular intervals. This can quickly clean the dust in the pressure sensing holes and prevent dust from adhering to the inner wall of the hole for a long time, which would cause water vapor to condense and mix with the dust to form a sticky ash, affecting the real-time differential pressure monitoring accuracy of the equipment. It also avoids differential pressure signal distortion caused by pressure sensing hole blockage. In addition, the automatic cleaning mechanism and dust blowing mechanism realize automatic cleaning of the pressure sensing holes, eliminating the need for manual disassembly at regular intervals, extending the maintenance cycle and reducing maintenance costs.

[0017] 2. In this invention, by setting a self-cleaning module, the control system starts the self-cleaning unit every 2 hours. The self-cleaning unit cleans multiple pressure-sensing holes for 40 seconds, which can quickly clean the dust in the pressure-sensing holes and prevent dust from adhering to the inner wall of the holes for a long time. When the differential pressure signal monitored by the differential pressure sensor drops sharply (by 30%), the system triggers the emergency cleaning mode. The emergency cleaning module triggers the automatic cleaning mechanism and the dust blowing mechanism to realize the emergency cleaning mode and extend the cleaning time to 60 seconds. If the differential pressure signal still does not recover after cleaning, the fault diagnosis module determines that the pressure-sensing hole is blocked and triggers a local audible and visual alarm and a remote SMS + APP alarm, reducing the fault diagnosis time and improving the system reliability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a real-time monitoring device for chimney flue gas flow according to the present invention; Figure 2 This is a schematic diagram of the rear structure of a real-time monitoring device for chimney flue gas flow according to the present invention. Figure 3 This is a schematic diagram of the flow monitoring mechanism of a real-time chimney flue gas flow monitoring device according to the present invention; Figure 4This is a schematic diagram of the Pitot tube probe mechanism of a real-time chimney flue gas flow monitoring device according to the present invention. Figure 5 This is a cross-sectional view of the Pitot tube probe mechanism of a real-time chimney flue gas flow monitoring device according to the present invention. Figure 6 This invention relates to a real-time monitoring device for flue gas flow in chimneys. Figure 5 Enlarged detail image of point A in the middle; Figure 7 This is a schematic diagram of the automatic cleaning mechanism of a real-time chimney flue gas flow monitoring device according to the present invention. Figure 8 This is a schematic diagram of the automatic cleaning mechanism of a real-time monitoring device for chimney flue gas flow of the present invention, which is flipped to a horizontal state. Figure 9 This is a cross-sectional view of the cleaning component of a real-time monitoring device for chimney flue gas flow according to the present invention. Figure 10 This is a cross-sectional view of the cleaning component of a real-time monitoring device for chimney flue gas flow according to the present invention. Figure 11 This is a system schematic diagram of a real-time monitoring device for chimney flue gas flow according to the present invention.

[0019] In the diagram: 1. Flow monitoring mechanism; 2. Pitot tube probe mechanism; 3. Assembly housing; 4. Controller; 5. Dust blowing mechanism; 6. Door panel; 11. Differential pressure transmitter; 12. Three-valve manifold; 13. Mounting base; 14. Monitoring tube; 21. Support rod; 22. Orientation rod; 23. Probe tube; 24. Automatic cleaning mechanism; 25. Total pressure port; 26. Static pressure port; 27. Total pressure outlet tube; 28. Static pressure outlet tube; 29. ​​Temperature sensor; 210. Differential pressure sensor; 211. Total pressure tube; 212. Static pressure tube; 213. PTFE (Polytetrafluoroethylene) Ethylene coating; 241. Triangular plate; 242. Micro motor; 243. Bevel gear one; 244. Gear rod; 245. Bevel gear two; 246. Toothed chain; 247. Electric push rod; 248. Rotating rod; 249. Mounting rod; 250. Slider; 251. Cleaning assembly; 252. Vertical rod; 253. Groove; 254. Cleaning plate; 255. Movable arm; 256. Cleaning brush; 51. Compressed air tank; 52. Air blowing pipe; 53. Thin tube one; 54. Thin tube two; 55. Filter screen; 56. Solenoid valve; 7. Pitot tube monitoring unit; 8. Self-cleaning unit; 81. Compressed air storage module; 82. Timed cleaning module; 83. Emergency cleaning module; 9. Data acquisition and processing unit; 91. Data acquisition module; 92. Data processing module; 93. Fault diagnosis module; 94. Storage module; 10. Remote monitoring unit. Detailed Implementation

[0020] 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.

[0021] Example 1: Refer to Figures 1-10 As shown: A real-time monitoring device for flue gas flow in a chimney includes a flow monitoring mechanism 1, a pitot tube probe mechanism 2, and a controller 4. One end of the flow monitoring mechanism 1 is fixedly connected to one end of the pitot tube probe mechanism 2. The pitot tube probe mechanism 2 includes a support rod 21 and a probe tube 23. One end of the probe tube 23 is fixedly connected to the support rod 21, and the other end of the probe tube 23 is provided with a total pressure hole 25. Static pressure holes 26 are symmetrically arranged on the side wall of the probe tube 23. The inner walls of the total pressure hole 25 and the static pressure hole 26 are provided with a polytetrafluoroethylene coating 213. The probe tube 23 is internally equipped with... Equipped with a temperature sensor 29 and a differential pressure sensor 210, a dust blowing mechanism 5 is installed on one side of the Pitot tube probe mechanism 2. The dust blowing mechanism 5 includes a compressed air tank 51 and a blowing pipe 52. One end of the blowing pipe 52 is connected to the compressed air tank 51, and the other end of the blowing pipe 52 is inserted into the probe tube 23 and symmetrically connected to two thin tubes 53. A thin tube 54 is fixed between the two thin tubes 53. One end of the thin tubes 53 and the thin tube 54 is connected to the static pressure port 26 and the total pressure port 25, respectively. An automatic cleaning mechanism 24 is installed on the top of the probe tube 23. The automatic cleaning mechanism 24 includes a triangular plate 241, a micro motor 242, a toothed chain 246, and a flipping mechanism that enables the triangular plate 241 to flip. A bevel gear 243 is fixedly connected to the output end of the micro motor 242. A mounting rod 249 is fixedly installed at one end of the triangular plate 241, and one end of the mounting rod 249 is rotatably mounted to the top of the probe tube 23. Gear rods 244 are rotatably mounted at the bottom of the three corners of the triangular plate 241, and cleaning components 251 are welded to the bottom of the gear rods 244. The outer walls of the top ends of the multiple gear rods 244 are all connected to the toothed chain. Chain 246 meshes, and a bevel gear 245 is welded to the top of one of the gear rods 244. The top of the bevel gear 245 meshes with one end of the bevel gear 243. The cleaning component 251 includes a vertical rod 252. Multiple grooves 253 are arranged in a ring array on the outer wall of the vertical rod 252. A cleaning plate 254 is arranged in the groove 253. A movable arm 255 is rotatably connected to one side of the cleaning plate 254 and fixedly connected to the other side of the cleaning plate 254. One end of the movable arm 255 is rotatably installed with the bottom of the groove 253. The flipping mechanism includes an electric push rod 247 and a rotating rod 248. The output end of the electric push rod 247 is rotatably mounted to one end of the rotating rod 248, and the other end of the rotating rod 248 is rotatably connected to a slider 250. The slider 250 is slidably mounted inside the mounting rod 249. A micro motor 242 is fixedly mounted on the top of the triangular plate 241. The electric push rod 247 is fixedly mounted on the top of the probe tube 23. Filter screens 55 are installed inside the ends of the thin tube 1 53 connected to the static pressure hole 26 and the thin tube 2 54 connected to the total pressure hole 25. A total pressure pipe 211 and a static pressure pipe 212 are provided inside the probe tube 23. One end of the total pressure pipe 211 is connected to the total pressure hole 25, and the static pressure pipe 212... One end of 12 is connected to the static pressure hole 26. The inside of the support rod 21 is equipped with a total pressure outlet pipe 27 and a static pressure outlet pipe 28. A directional rod 22 is fixedly installed on the outside of the support rod 21. A solenoid valve 56 is provided at one end of the air blowing pipe 52. The flow monitoring mechanism 1 includes a differential pressure transmitter 11, a three-valve group 12 and a mounting base 13. The differential pressure transmitter 11 and the mounting base 13 are respectively fixedly installed at both ends of the three-valve group 12. A monitoring tube 14 is welded to one end of the mounting base 13. An assembly housing 3 is fixedly installed on the outside of the flow monitoring mechanism 1. The controller 4 and the compressed air storage tank 51 are respectively fixedly installed on both sides of the assembly housing 3. A door panel 6 is rotatably installed on the front side of the assembly housing 3.

[0022] In this embodiment, when the real-time flue gas flow monitoring device is in use, such as Figure 5 As shown, the probe tube 23 is inserted inside the flue gas duct, with the direction of the probe tube 23 parallel to the flue gas flow direction, and the total pressure hole 25 facing the flue gas flow direction. After the control system of the controller 4 is started, the total pressure hole 25 in the probe tube 23 is located at the front end of the probe head to collect the total pressure of the flue gas, and the static pressure hole 26 is located on the side of the probe, perpendicular to the flue gas flow direction, to collect the static pressure of the flue gas. The connection between the total pressure hole 25 and the thin tube 2 54, and the connection between the static pressure hole 26 and the thin tube 1 53, is equipped with an anti-clogging filter 55 to prevent large dust particles from entering. The inner walls of the total pressure hole 25 and the static pressure hole 26 are coated with polytetrafluoroethylene 213 to reduce dust adhesion. The differential pressure sensor 210 converts the differential pressure signal between the total pressure hole 25 and the static pressure hole 26 into an electrical signal. The temperature sensor 29 collects the flue gas temperature. The flow monitoring mechanism 1 introduces temperature, humidity, and atmospheric pressure to dynamically compensate for the flue gas density and calculates the real-time flue gas flow rate according to the ideal gas state equation and the flue gas flow rate calculation formula. Controller 4 automatically controls the opening of electric push rod 247, micro motor 242, and solenoid valve 56. Electric push rod 247 drives rotating rod 248 to retract. Rotating rod 248 drives mounting rod 249 and triangular plate 241 to rotate 90°. After rotating 90°, triangular plate 241 is parallel to probe tube 23 (triangular plate 241 from...). Figure 7 Flip to as shown Figure 8(As shown in the diagram), the triangular plate 241 is triangular in shape, with cleaning components 251 rotatably mounted at the bottom of each of the three corners. The three cleaning components 251 are located on one side of the main pressure hole 25 and the two static pressure holes 26 on both sides, and the outer walls of the top of each of the three cleaning components 251 mesh with the toothed chain 246. The micro motor 242 drives the bevel gear 1 243 to rotate, and the outer wall of the bevel gear 1 243 meshes with the outer wall of the bevel gear 245, thereby driving the bevel gear 245 and one of the cleaning components 251 to rotate. Under the action of the toothed chain 246, the three cleaning components 251 can rotate simultaneously. The cleaning plate 254 is rotatably mounted to the vertical rod 252 via the movable arm 255. When the cleaning components 251 rotate, the multiple cleaning plates 254 move to the outside of the groove 253 under the action of centrifugal force. The cleaning brush 256 on the outside of the cleaning plate 254 is composed of several small brush heads, which can brush away the dust on the outer walls of the main pressure hole 25 and the static pressure holes 26 as well as the hole walls. Simultaneously, after the solenoid valve 56 opens, the compressed air tank 51 delivers dry compressed air to the blowing pipe 52, and then blows it into the thin tube 1 53 and thin tube 2 54 through the blowing pipe 52. The inner diameters of the thin tube 1 53 and thin tube 2 54 are much smaller than the inner diameter of the blowing pipe 52. Therefore, the dry air in the blowing pipe 52 accumulates in the thin tube 1 53 and thin tube 2 54. The thin tube 1 53 sprays the accumulated compressed air into the static pressure port 26 for 40 seconds, and the thin tube 2 54 sprays the accumulated compressed air into the total pressure port 25 for 40 seconds. The dust blowing mechanism 5 and the automatic cleaning mechanism 24 work together to quickly clean the dust in the total pressure port 25 and static pressure port 26. This device uses the anti-clogging design (filter) built into the Pitot tube probe tube 23. The mesh 55 and PTFE coating 213) self-clean the multiple pressure-sensing holes of the probe tube 23 at regular intervals, which can quickly clean the dust in the pressure-sensing holes and prevent dust from adhering to the inner wall of the hole for a long time. This prevents water vapor from condensing and mixing with the dust to form a sticky ash, which would affect the real-time differential pressure monitoring accuracy of the equipment and avoid the distortion of differential pressure signal caused by the blockage of the pressure-sensing holes. In addition, the automatic cleaning mechanism 24 and the dust blowing mechanism 5 realize the automatic cleaning of the pressure-sensing holes, eliminating the need for manual disassembly at regular intervals, extending the maintenance cycle and reducing maintenance costs. After cleaning is completed, the controller 4 automatically controls the electric push rod 247 to drive the triangular plate 241 to flip back to its original position and controls the micro motor 242 and the solenoid valve 56 to close.

[0023] Example 2: Figures 1-11 As shown, a real-time flue gas flow monitoring system is used, which includes a Pitot tube monitoring unit 7, a self-cleaning unit 8, a data acquisition and processing unit 9, and a remote monitoring unit 10. The Pitot tube monitoring unit 7 collects the temperature data of the flue gas through the temperature sensor 29 to provide a temperature compensation basis for flow calculation, and collects the total pressure and static pressure data of the flue gas through the differential pressure sensor 210, and converts the difference between the total pressure and static pressure into an electrical signal output. The self-cleaning unit 8 periodically cleans the static pressure port 26 and the total pressure port 25 through the dust blowing mechanism 5 and the automatic cleaning mechanism 24. The self-cleaning unit 8 includes a compressed air storage module 81, a timed cleaning module 82, and an emergency cleaning module 83. The compressed air storage module 81 stores dry compressed air for cleaning through the compressed air tank 51 and ensures a stable air supply. The timed cleaning module 82 is electrically connected to a solenoid valve 56, a micro motor 242, and an electric push rod 247. The cleaning cycle and cleaning duration of the automatic cleaning mechanism 24 are set by the controller 4. The controller 4 periodically opens the solenoid valve 56, the micro motor 242, and the electric push rod 247. The compressed air tank 51 sprays compressed air into the static pressure port 26 and the total pressure port 25 through the thin tube 1 53 and the thin tube 2 54. The electric push rod 247 drives the triangular plate 241 to flip to be parallel with the probe tube 23. The micro motor 242 drives the three cleaning components 251 to rotate, realizing self-cleaning. In the emergency cleaning module 83, when the differential pressure sensor 210 detects an abnormal differential pressure signal, it triggers the automatic cleaning mechanism 24 and the dust blowing mechanism 5 to realize the emergency cleaning mode. The data acquisition and processing unit 9 receives the monitoring signals from the pitot tube monitoring unit 7 and performs flow calculations. The data acquisition and processing unit 9 includes a data acquisition module 91, a data processing module 92, a fault diagnosis module 93, and a storage module 94. The data acquisition module 91 acquires raw differential pressure data, raw temperature data, and flue gas humidity data through a processor for density compensation. The data processing module 92 incorporates temperature, humidity, and atmospheric pressure to dynamically compensate for flue gas density and calculates the real-time flue gas flow rate based on the ideal gas law and the flue gas flow rate calculation formula. The fault diagnosis module 93 monitors the output signals of each sensor in real time. When the differential pressure signal remains unchanged for 3 consecutive minutes, the temperature sensor 29 outputs outside its measurement range, or the compressed air tank 51 experiences abnormal air supply, a fault alarm is triggered. The storage module 94 stores real-time monitoring data and historical data. The remote monitoring unit 10 enables remote transmission, storage and management of data. The wireless transmission module uses 5G / LoRa communication to transmit real-time monitoring data and historical data to the cloud server. The cloud data platform has functions such as data display, data export, abnormal alarm, equipment management and data sharing. The local display terminal uses a touch screen to display monitoring data and equipment status in real time.

[0024] In this embodiment, by setting a self-cleaning unit 8, the self-cleaning unit 8 can clean the multiple pressure-sensing holes of the probe tube 23 at regular intervals, which can quickly clean the dust in the pressure-sensing holes and prevent the dust from adhering to the inner wall of the hole for a long time. When the differential pressure signal detected by the differential pressure sensor 210 drops sharply (by 30%), the system triggers the emergency cleaning mode. The emergency cleaning module 83 triggers the automatic cleaning mechanism 24 and the dust blowing mechanism 5 to realize the emergency cleaning mode and extend the cleaning time to 60 seconds. If the differential pressure signal still does not recover after cleaning, the fault diagnosis module 93 determines that the pressure-sensing hole is blocked and triggers the local audible and visual alarm and the remote SMS + APP alarm. The wireless transmission module transmits real-time monitoring data (flow rate, temperature, differential pressure, and fault status) to the cloud data platform via 5G / LoRa communication. The local display terminal displays the data curves in real time, while the cloud platform stores historical data. Users can view real-time data and historical trend charts via computer or mobile APP, and export data in Excel format. When a fault alarm occurs, the platform automatically pushes alarm information to maintenance personnel, who can remotely view the fault type and perform timely repairs.

[0025] The usage and working principle of this device are as follows: When the real-time flue gas flow monitoring device is in use, after the control system of the controller 4 is started, the total pressure port 25 collects the total pressure of the flue gas, the static pressure port 26 collects the static pressure of the flue gas, the differential pressure sensor 210 converts the differential pressure signal of the total pressure port 25 and the static pressure port 26 into an electrical signal, the temperature sensor 29 collects the flue gas temperature, the data acquisition module 91 collects the raw differential pressure data, the raw temperature data, and the flue gas humidity data through the processor, and transmits them to the data processing module 92. The data processing module 92 introduces temperature, humidity, and atmospheric pressure to dynamically compensate for the flue gas density, and calculates the real-time flue gas flow rate according to the ideal gas state equation and the flue gas flow rate calculation formula. The control system starts the self-cleaning unit 8 every 2 hours. First, the controller 4 automatically controls the electric push rod 247, the micro motor 242 and the solenoid valve 56 to open. The electric push rod 247 drives the rotating rod 248 to retract. The rotating rod 248 drives the mounting rod 249 and the triangular plate 241 to rotate 90°. After the triangular plate 241 rotates 90°, it is parallel to the probe tube 23. The micro motor 242 drives the bevel gear 1 243 to rotate, thereby driving the bevel gear 2 245 and one of the cleaning components 251 to rotate. Under the action of the toothed chain 246, the three cleaning components 251 can rotate simultaneously. Multiple cleaning plates 254 move to the outside of the groove 253 under the action of centrifugal force. The cleaning brush 256 on the outside of the cleaning plate 254 can brush away the dust on the outer wall of the total pressure hole 25 and the static pressure hole 26 as well as the hole wall. Simultaneously, after the solenoid valve 56 is opened, the compressed air storage tank 51 delivers dry compressed air to the blowing pipe 52, and then blows it into the thin tube 53 and the thin tube 54. The thin tube 53 sprays the accumulated compressed air into the static pressure hole 26 for 40 seconds, and the thin tube 54 sprays the accumulated compressed air into the total pressure hole 25 for 40 seconds. The dust blowing mechanism 5 and the automatic cleaning mechanism 24 work together to quickly clean the dust in the total pressure hole 25 and the static pressure hole 26. The device is cleaned periodically by the self-cleaning unit 8. The self-cleaning unit 8 cleans the multiple pressure sensing holes of the probe tube 23 at regular intervals, which can quickly clean the dust in the pressure sensing holes. In addition, there is no need for manual disassembly, which extends the maintenance cycle. The fault diagnosis module 93 provides real-time alarms, which reduces the fault diagnosis time and improves the system reliability. After cleaning is completed, the controller 4 automatically controls the electric push rod 247 to drive the triangular plate 241 to flip back to its original position and controls the micro motor 242 and the solenoid valve 56 to close.

[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A real-time monitoring device for flue gas flow in a chimney, comprising a flow monitoring mechanism (1), a pitot tube probe mechanism (2), and a controller (4), wherein one end of the flow monitoring mechanism (1) is fixedly connected to one end of the pitot tube probe mechanism (2), the pitot tube probe mechanism (2) comprises a support rod (21) and a probe tube (23), one end of the probe tube (23) is fixedly connected to the support rod (21), and the other end of the probe tube (23) is provided with a total pressure hole (25), and static pressure holes (26) are symmetrically provided on the side wall of the probe tube (23), characterized in that: The inner walls of the total pressure hole (25) and static pressure hole (26) are coated with polytetrafluoroethylene (PTFE) (213). A temperature sensor (29) and a differential pressure sensor (210) are installed inside the probe tube (23). A dust blowing mechanism (5) is installed on one side of the Pitot tube probe mechanism (2). The dust blowing mechanism (5) includes a compressed air tank (51) and a blowing pipe (52). One end of the blowing pipe (52) is connected to the compressed air tank (51). The other end of the blowing pipe (52) is inserted into the probe tube (23) and symmetrically connected with two thin tubes (53). A thin tube (54) is fixed between the two thin tubes (53). One end of the thin tubes (53) and the thin tube (54) are connected to the static pressure hole (26) and the total pressure hole (25) respectively. An automatic cleaning mechanism (24) is installed on the top of the probe tube (23). The automatic cleaning mechanism (24) includes a triangular plate (241), a micro motor (242), a toothed chain (246), and a flipping mechanism that can flip the triangular plate (241). The output end of the micro motor (242) is fixedly connected to a bevel gear (243). One end of the triangular plate (241) is fixedly mounted with a mounting rod (249), and one end of the mounting rod (249) is rotatably mounted to the top of the probe tube (23). Gear rods (244) are rotatably mounted on the bottom of the three corners of the triangular plate (241), and a cleaning component (251) is welded to the bottom of the gear rods (244). The outer wall of the top of the multiple gear rods (244) meshes with the toothed chain (246). One of the gear rods (244) is welded to the top of a bevel gear (245), and the top of the bevel gear (245) meshes with one end of the bevel gear (243).

2. The real-time monitoring device for chimney flue gas flow according to claim 1, characterized in that: The cleaning component (251) includes a vertical rod (252), and the outer wall of the vertical rod (252) is provided with a plurality of grooves (253) arranged in a ring array. A cleaning plate (254) is provided in the groove (253). A movable arm (255) is rotatably connected to one side of the cleaning plate (254) and a cleaning brush (256) is fixedly connected to the other side of the cleaning plate (254). One end of the movable arm (255) is rotatably installed with the bottom of the groove (253).

3. The real-time monitoring device for chimney flue gas flow according to claim 1, characterized in that: The flipping mechanism includes an electric push rod (247) and a rotating rod (248). The output end of the electric push rod (247) is rotatably mounted to one end of the rotating rod (248), and the other end of the rotating rod (248) is rotatably connected to a slider (250). The slider (250) is slidably mounted inside the mounting rod (249). The micro motor (242) is fixedly mounted on the top of the triangular plate (241), and the electric push rod (247) is fixedly mounted on the top of the probe tube (23).

4. The real-time monitoring device for chimney flue gas flow according to claim 1, characterized in that: The ends of the thin tube 1 (53) connected to the static pressure hole (26) and the thin tube 2 (54) connected to the total pressure hole (25) are all equipped with filter screens (55). The probe tube (23) is equipped with a total pressure tube (211) and a static pressure tube (212). One end of the total pressure tube (211) is connected to the total pressure hole (25), and one end of the static pressure tube (212) is connected to the static pressure hole (26).

5. The real-time monitoring device for chimney flue gas flow according to claim 1, characterized in that: The support rod (21) is equipped with a total pressure outlet pipe (27) and a static pressure outlet pipe (28) inside. A directional rod (22) is fixedly installed on the outside of the support rod (21). A solenoid valve (56) is provided at one end of the air blowing pipe (52).

6. The real-time monitoring device for chimney flue gas flow according to claim 1, characterized in that: The flow monitoring mechanism (1) includes a differential pressure transmitter (11), a three-valve group (12) and a mounting base (13). The differential pressure transmitter (11) and the mounting base (13) are respectively fixedly installed at both ends of the three-valve group (12), and a monitoring tube (14) is welded to one end of the mounting base (13).

7. The real-time monitoring device for chimney flue gas flow according to claim 1, characterized in that: An assembly shell (3) is fixedly installed on the outside of the flow monitoring mechanism (1). The controller (4) and the compressed air tank (51) are fixedly installed on both sides of the assembly shell (3). A door panel (6) is rotatably installed on the front side of the assembly shell (3).

8. The real-time monitoring device for chimney flue gas flow according to claim 1, characterized in that, A real-time flue gas flow monitoring system was used, which includes a Pitot tube monitoring unit (7), a self-cleaning unit (8), a data acquisition and processing unit (9), and a remote monitoring unit (10). The Pitot tube monitoring unit (7) collects the temperature data of the flue gas through the temperature sensor (29) to provide temperature compensation for flow calculation, and collects the total pressure and static pressure data of the flue gas through the differential pressure sensor (210) and converts the difference between the total pressure and static pressure into an electrical signal output. The self-cleaning unit (8) periodically cleans the static pressure hole (26) and the total pressure hole (25) through the dust blowing mechanism (5) and the automatic cleaning mechanism (24). The data acquisition and processing unit (9) is used to receive the monitoring signal from the pitot tube monitoring unit (7) and perform flow calculation; The remote monitoring unit (10) realizes remote transmission, storage and management of data. The wireless transmission module adopts 5G / LoRa communication to transmit real-time monitoring data and historical data to the cloud server. The cloud data platform has functions of data display, data export, abnormal alarm, equipment management and data sharing. The local display terminal uses a touch screen to display monitoring data and equipment status in real time.

9. The real-time monitoring device for chimney flue gas flow according to claim 8, characterized in that: The self-cleaning unit (8) includes a compressed air storage module (81), a timed cleaning module (82), and an emergency cleaning module (83). The compressed air storage module (81) is used to store clean, dry compressed air through the compressed air storage tank (51) and to ensure a stable air supply; In the timed cleaning module (82), the solenoid valve (56), the micro motor (242) and the electric push rod (247) are electrically connected. The cleaning cycle and cleaning duration of the automatic cleaning mechanism (24) are set by the controller (4). The controller (4) opens the solenoid valve (56), the micro motor (242) and the electric push rod (247) at regular intervals. The compressed air tank (51) sprays compressed air into the static pressure hole (26) and the total pressure hole (25) through the thin tube one (53) and the thin tube two (54). The electric push rod (247) drives the triangular plate (241) to flip to be parallel with the probe tube (23). The micro motor (242) drives the three cleaning components (251) to rotate, realizing self-cleaning. In the emergency cleaning module (83), when the differential pressure sensor (210) detects an abnormal differential pressure signal, it triggers the automatic cleaning mechanism (24) and the dust blowing mechanism (5) to realize the emergency cleaning mode.

10. The real-time monitoring device for chimney flue gas flow according to claim 8, characterized in that: The data acquisition and processing unit (9) includes a data acquisition module (91), a data processing module (92), a fault diagnosis module (93), and a storage module (94). The data acquisition module (91) acquires raw differential pressure data, raw temperature data, and flue gas humidity data through the processor for density compensation; The data processing module (92) introduces temperature, humidity and atmospheric pressure to dynamically compensate for flue gas density, and calculates real-time flue gas flow rate according to the ideal gas state equation and flue gas flow rate calculation formula. The fault diagnosis module (93) monitors the output signals of each sensor in real time. When the differential pressure signal remains unchanged for 3 minutes, the output of the temperature sensor (29) exceeds the measurement range, or the compressed air tank (51) has an abnormal air supply, a fault alarm is triggered. The storage module (94) is used to store real-time monitoring data and historical data.

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