An emergency sampling and monitoring system and method for flare emission flue gas

Abstract

The present invention discloses an emergency sampling and monitoring system and a monitoring method for flare emission flue gas, which relates to the technical field of flue gas collection and monitoring. In the present invention, a sampling control unit is slidably mounted on a detection and positioning module. The detection and positioning module rotates to achieve the movement of the sampling control unit. An infrared thermal imager is mounted on a mobile detection platform and is used to detect the plume trajectory. A concentration detection unit is slidably mounted on the sampling control unit and moves along the circumference of the flare. A PID sensor is used to detect the VOCs concentration at different positions of the plume. A heat-insulated collection box is connected to a vehicle-mounted analysis unit through a flue gas heat tracing pipe. A collection pipeline is arranged between the flue gas collector and the concentration detection unit. Each PID sensor corresponds to a collection pipeline. The flue gas collector collects the flue gas at the optimal sampling point into the heat-insulated collection box through the collection pipeline. By means of the pre-stored gas sampling and monitoring method, the present invention can effectively avoid the influence on the flue gas sampling and monitoring process caused by the change of the plume trajectory.

Description

Technical Field

[0001] The present invention belongs to the technical field of flue gas sampling and monitoring, and particularly relates to an emergency sampling and monitoring system and method for flare emission flue gas. Background Art

[0002] In the petrochemical production device flare system, due to design or operation, incomplete combustion occurs. Combustion waste gas in the petrochemical industry has become an important emission source of volatile organic compounds (VOCs). Currently, there is still a blank in the emission detection of flare flue gas in China. Due to the lack of detection means, it is impossible to ensure the authenticity and accuracy of flare VOCs emission data, and it is also impossible to propose an effective direction for guiding emission reduction and treatment. There is currently no standard for flare emission measurement in China.

[0003] In the prior art, the general method for flare flue gas sampling and monitoring is to arrange a flue gas sampler at the flare sampling point to achieve fixed-point flue gas sampling and monitoring through this flue gas sampler. This fixed-point monitoring method cannot adapt to the sampling and monitoring of flue gas with changing directions, reducing the authenticity of the flue gas sampling data, or directly inserting the sampling head into the flue gas to achieve sampling and monitoring. This monitoring method cannot achieve sampling and monitoring of flue gas in high-value areas, reducing the accuracy of the flue gas sampling and monitoring. Therefore, we provide an emergency sampling and monitoring system and method for flare emission flue gas to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide an emergency sampling and monitoring system and method for flare emission flue gas. Through the specific structural design of the detection and positioning module, sampling control unit, concentration detection unit, mobile detection platform, multi-stage detection module, and sampling and analysis system, it solves the problems that the existing fixed-point monitoring method cannot adapt to the sampling and monitoring of flue gas with changing directions, reducing the authenticity of the flue gas sampling data, and directly inserting the sampling head into the flue gas to achieve sampling and monitoring. This monitoring method cannot achieve sampling and monitoring of flue gas in high-value areas, reducing the accuracy of the flue gas sampling and monitoring.

[0005] To solve the above technical problems, the present invention is implemented through the following technical solutions: The present invention is an emergency sampling and monitoring system for the flue gas discharged from a torch, which includes a mobile detection platform, a multi-stage detection module, a sampling and analysis system, and a detection and positioning module. The mobile detection platform is used to lift the detection and positioning module to a preset height. Among them, the sampling and analysis system includes a sampling control unit and a vehicle-mounted analysis unit. The sampling control unit is slidably installed on the detection and positioning module, and the detection and positioning module moves the sampling control unit through rotation. The multi-stage detection module includes an infrared thermal imager and a concentration detection unit. The infrared thermal imager is installed on the mobile detection platform and is used to detect the plume trajectory. The concentration detection unit is slidably installed on the sampling control unit and moves along the circumference of the torch. The concentration detection unit includes a plurality of PID sensors, and the PID sensors are used to detect the VOCs concentration at different positions of the plume. The sampling control unit includes a heat-insulated collection box and a flue gas collector. The heat-insulated collection box is connected to the vehicle-mounted analysis unit through a flue gas trace heating pipe. A collection pipeline is arranged between the flue gas collector and the concentration detection unit. Each PID sensor corresponds to a collection pipeline. The flue gas collector collects the flue gas at the optimal sampling point into the heat-insulated collection box through the collection pipeline.

[0006] In some embodiments, the mobile detection platform includes a liftable sampling tower, and a rotating cloud platform is installed on the liftable sampling tower. The detection and positioning module includes a detection and positioning frame installed on the central axis of the rotating cloud platform. A U-shaped carrier is fixed at the top of the detection and positioning frame. Two mounting plates are symmetrically fixed on the outer side of the U-shaped carrier. A first elastic member is connected to the mounting plate. A positioning slideway is opened on the surface of the U-shaped carrier along its length direction.

[0007] In some embodiments, the sampling control unit further includes a sampling stage. The heat-insulated collection box and the flue gas collector are both installed on the top of the sampling stage. The intake end of the flue gas collector is connected to a first joint. The outlet end of the flue gas collector is connected to a flue gas collection pipe communicating with the heat-insulated collection box. A pressure detection pipe is installed on the circumferential surface of the heat-insulated collection box. A pressure gauge is installed on the pressure detection pipe. A second joint is installed at the bottom of the heat-insulated collection box. The flue gas trace heating pipe is connected between the vehicle-mounted analysis unit and the second joint. Automatic control valves are installed on both the flue gas collection pipe and the second joint.

[0008] In some embodiments, the concentration detection unit further includes an arc-shaped detection frame. The PID sensors are evenly arranged on the top of the arc-shaped detection frame. An arc-shaped smoke guide pipe is arranged outside the arc-shaped detection frame. A flue gas collection part corresponding to each PID sensor is installed on the arc-shaped detection frame. The flue gas collection part is communicated with the arc-shaped smoke guide pipe. An automatic control valve is installed on the flue gas collection part. A third joint is installed on the circumferential surface of the arc-shaped smoke guide pipe. The third joint is connected to the first joint through a sampling hose.

[0009] In some embodiments, a flue gas insulation box that is hermetically sleeved outside the heat preservation collection box is installed on the top of the sampling stage. A downward exhaust pipe is installed on the circumferential side surface of the flue gas insulation box close to the top. A flue gas flow pipe communicating with the flue gas insulation box is installed on the flue gas collection pipe, and a self-control valve is installed on the flue gas flow pipe.

[0010] In some embodiments, the sampling control unit further includes a hollow gas gathering part and a hollow air pushing part. The hollow gas gathering part is arranged inside the U-shaped carrier, and the hollow air pushing part is arranged outside the U-shaped carrier. A moving part connecting the hollow gas gathering part and the hollow air pushing part is slidably arranged inside the positioning slideway. The hollow gas gathering part and the hollow air pushing part are communicated through a guide air hole. The sampling stage is fixedly installed on the top of the hollow air pushing part, and the hollow air pushing part is in contact with the first elastic members on both sides thereof.

[0011] In some embodiments, a moving frame is slidably arranged on the top of the U-shaped carrier. A gas supply device is installed on the top of the moving frame. An air supply pipe communicating with the hollow gas gathering part is connected to the air outlet end of the gas supply device, and a self-control valve is installed on the air supply pipe close to the hollow gas gathering part. The concentration detection unit further includes an arc-shaped bearing frame. The arc-shaped detection frame is installed on the top of the arc-shaped bearing frame. A plurality of rollers are rotatably installed inside the arc-shaped bearing frame. A first support rod and a second support rod are respectively fixed on the arc-shaped bearing frame. The first support rod slidably penetrates through the moving frame, and a support disk fixed to the end of the first support rod is connected to the moving frame through a second elastic member. The second support rod slidably penetrates into the hollow air pushing part, and a piston plate that fits inside the cavity of the hollow air pushing part is fixed to the end of the second support rod.

[0012] In some embodiments, horizontal sliding rods are respectively fixed on both opposite sides of the hollow gas gathering part. A piston disk is fixedly installed on the circumferential side surface of the horizontal sliding rod. A first diversion pipe corresponding to the horizontal sliding rod is communicated and arranged at the bottom of the hollow gas gathering part, and a one-way valve is installed on the first diversion pipe close to the bottom of the hollow gas gathering part. Two compression air pipes are symmetrically fixed inside the U-shaped carrier. The horizontal sliding rod extends into the corresponding compression air pipe, and the piston disk is slidably fitted inside the corresponding compression air pipe. A pressure relief valve is installed on the exhaust pipe arranged at the end of the compression air pipe. A second diversion pipe is communicated and arranged on the circumferential side surface of the compression air pipe. The first diversion pipe is hermetically and slidably fitted inside the corresponding second diversion pipe.

[0013] The present invention has the following beneficial effects: 1. The present invention collects the flue gas at the optimal sampling point into the heat-insulated collection box through the flue gas collector according to the corresponding collection pipeline. The flue gas entering the heat-insulated collection box along the flue gas collection pipe is transported to the on-vehicle analysis unit through the flue gas heat tracing pipe for data analysis. When the automatic control valve on the second joint is in the closed state and the automatic control valve on the flue gas collection pipe is in the open state, the flue gas at the optimal sampling point can be continuously transported to the heat-insulated collection box through the flue gas collector, so that the internal air pressure of the heat-insulated collection box gradually increases. The pressure gauge displays the internal air pressure of the heat-insulated collection box in real time. When it is monitored that the internal air pressure of the heat-insulated collection box is approaching the set threshold, at this time, opening the automatic control valve on the second joint can make the flue gas in the heat-insulated collection box be transported to the on-vehicle analysis unit through the flue gas heat tracing pipe for data analysis. Through this pre-gas storage sampling and monitoring method, the influence on the flue gas sampling and monitoring process at the optimal sampling point caused by the change of the plume trajectory can be effectively avoided.

[0014] When the pressure gauge monitors that the internal air pressure of the heat-insulated collection box is approaching the set high threshold, the automatic control valve on the flue gas collection pipe is closed, and at the same time, the automatic control valve on the second joint and the automatic control valve on the flue gas flow-through pipe are opened. At this time, the flue gas in the heat-insulated collection box is transported to the on-vehicle analysis unit through the flue gas heat tracing pipe for data analysis. In this process, the flue gas extracted by the flue gas collector is transported to the flue gas heat-insulated box along the flue gas flow-through pipe and then discharged through the exhaust pipe. In this way, the heat insulation treatment of the heat-insulated collection box inside the flue gas heat-insulated box is realized, and the condensation of the flue gas entering the heat-insulated collection box can be effectively avoided, which affects the monitoring and analysis results.

[0015] In the initial state, the hollow air-gathering part is located at the middle position of the U-shaped carrier. Both piston disks are fitted inside the corresponding compression air pipes, and both first guide pipes are fitted inside the corresponding second guide pipes. The U-shaped carrier is controlled to rotate so that the concentration detection unit moves and adjusts to the plume trajectory. In this process, the piston disk on the corresponding side of the horizontal slide bar slides along the corresponding compression air pipe and compresses the air inside it, so that the compressed air enters the hollow air-gathering part along the corresponding compression air pipe, second guide pipe and first guide pipe. Thus, the replenishment of the air compression potential energy in the inner cavity of the hollow air-pushing part can be realized, and further the stability of the whole concentration detection unit against the torch body can be improved.

[0016] After the preliminary positioning of the entire concentration detection unit on the torch body is achieved in the present invention, the rotation of the rotary cloud platform is controlled to make the U-shaped carrier rotate towards the direction close to the plume trajectory. During this process, the rotating U-shaped carrier drives the middle air pushing part to move towards the plume and compress the corresponding first elastic member. The moving frame moves along the U-shaped carrier synchronously under the action of the first support rod towards the plume and compresses the second elastic member. The piston plate gradually moves along the inner cavity of the middle air pushing part away from the torch body. The air in the inner cavity of the middle air pushing part is compressed and flows back along the air guide hole into the inner cavity of the hollow air gathering part until the concentration detection unit is moved into the plume trajectory. In this way, the efficient positioning of the concentration detection unit during the flue gas sampling and monitoring process can be realized, which is beneficial to improving the efficiency of flue gas sampling and monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is the sampling and monitoring flow chart of the emergency sampling and monitoring system for the flue gas discharged from the torch in the present invention.

[0019] Figure 2 It is the partial structure diagram of the emergency sampling and monitoring system for the flue gas discharged from the torch in the present invention.

[0020] Figure 3 It is Figure 2 the enlarged view of the partial structure at A in

[0021] Figure 4 It is Figure 2 the top view of the structure of

[0022] Figure 5 It is Figure 2 another state diagram.

[0023] Figure 6 It is the structure schematic diagram of the detection and positioning module in the present invention.

[0024] Figure 7 It is Figure 6 the structure schematic diagram from another angle.

[0025] Figure 8 It is the structure schematic diagram of the sampling control unit in the present invention.

[0026] Figure 9 It is Figure 8 the partial structure schematic diagram of

[0027] Figure 10 is Figure 9 the top view of the structure of

[0028] Figure 11 is Figure 9 the side view of the structure of

[0029] Figure 12 is the schematic structural diagram of the concentration detection unit in the present invention.

[0030] Figure 13 is Figure 12 the enlarged partial structural view at position B in

[0031] In the attached drawings, the list of components represented by each label is as follows:

[0032] 1 - Detection and positioning module, 2 - Sampling control unit, 3 - Concentration detection unit, 4 - PID sensor, 5 - Flue gas collector, 6 - Flue gas tracing pipe, 7 - Detection and positioning frame, 8 - U-shaped carrier, 9 - Mounting plate, 10 - First elastic member, 11 - Positioning slideway, 12 - Sampling stage, 13 - First joint, 14 - Flue gas collection pipe, 15 - Air pressure detection pipe, 16 - Pressure gauge, 17 - Second joint, 18 - Automatic control valve, 19 - Arc-shaped detection frame, 20 - Arc-shaped flue gas pipe, 21 - Flue gas collection part, 22 - Third joint, 23 - Sampling hose, 24 - Flue gas insulation box, 25 - Exhaust pipe, 26 - Flue gas flow-through pipe, 27 - Hollow gas accumulation part, 28 - Middle air pushing part, 29 - Air guide hole, 30 - Moving frame, 31 - Gas supply equipment, 32 - Gas supply pipe, 33 - Arc-shaped bearing frame, 34 - Roller, 35 - First support rod, 36 - Second support rod, 37 - Support plate, 38 - Second elastic member, 39 - Piston plate, 40 - Horizontal slide bar, 41 - Piston disc, 42 - First diversion pipe, 43 - Check valve, 44 - Compressed air pipe, 45 - Air discharge pipe, 46 - Air release valve, 47 - Second diversion pipe, 48 - Torch body. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0034] Specific embodiment one, please refer to Figure 1-13, the present invention is an emergency sampling and monitoring system for flue gas discharged from a torch, including a mobile detection platform, a multi-level detection module, a sampling and analysis system, and a detection and positioning module 1. The mobile detection platform is used to lift the detection and positioning module 1 to a preset height. Among them, the sampling and analysis system includes a sampling control unit 2 and a vehicle-mounted analysis unit. The sampling control unit 2 is slidably installed on the detection and positioning module 1. The detection and positioning module 1 moves the sampling control unit 2 by rotation, that is, by controlling the fixed-point rotation of the detection and positioning module 1, the sampling control unit 2 slides along the detection and positioning module 1 in one direction. Figure 4 The position where the sampling control unit 2 is located is the middle position of the detection and positioning module 1. When the detection and positioning module 1 is controlled to rotate clockwise by a certain angle, it drives the sampling control unit 2 to slide along the detection and positioning module 1 in the upper left direction (as Figure 5 shown).

[0035] The multi-level detection module includes an infrared thermal imager and a concentration detection unit 3. The infrared thermal imager is installed on the mobile detection platform and is used to detect the plume trajectory. The resolution of the infrared thermal imager (FLIR) in this embodiment is 640×512, the thermal sensitivity ≤20mK, and the scanning range is horizontal ±180°, vertical -30°~+90°. The concentration detection unit 3 is slidably installed on the sampling control unit 2 and moves along the circumference of the torch. When the plume trajectory is detected by the infrared thermal imager, the high-concentration area (i.e., the concentration peak area) of the plume is detected by the concentration detection unit 3. Finally, the sampling control unit 2 samples and analyzes the flue gas in the high-concentration area of the plume. During the process of controlling the rotation of the detection and positioning module 1, the sampling control unit 2 sliding along the length direction of the detection and positioning module 1 drives the concentration detection unit 3 to move synchronously, so that the concentration detection unit 3 always rolls along the circumferential surface of the torch body 48 until the position of the concentration detection unit 3 is adjusted to the detected plume trajectory.

[0036] The concentration detection unit 3 includes a plurality of PID sensors 4 (high temperature resistant). The PID sensors 4 are used to detect the VOCs concentration at different positions of the plume. After the position of the concentration detection unit 3 is adjusted to the detected plume trajectory, the concentration peak area of the flue gas is detected and identified by the circumferentially arranged plurality of PID sensors 4, and the concentration peak area is marked as the optimal sampling point coordinates.

[0037] The sampling control unit 2 includes a heat-insulated sampling box and a flue gas sampler 5. The heat-insulated sampling box is connected to the on-vehicle analysis unit through a flue gas heat tracing pipe 6 (this flue gas heat tracing pipe 6 is a heat-insulated sampling pipe, its inner lining is a polytetrafluoroethylene pipe, with an inner diameter of 8 mm and a length of 40 m. Its function is to prevent the condensation of VOCs in the flue gas. The flue gas passing through the flue gas heat tracing pipe 6 is first preliminarily filtered to remove particulate matter through a 5-μm stainless steel filter screen, then further removes particulate matter through a PTFE membrane filter, and finally removes interfering components such as H2O and CO2 through a molecular sieve adsorption column). A mass flowmeter (0 - 1.2 L / min) is installed on the flue gas heat tracing pipe 6 close to the position of the fast gas chromatography-mass spectrometry (GC-MS). There is a sampling pipeline arranged between the flue gas sampler 5 and the concentration detection unit 3. Each PID sensor 4 corresponds to one sampling pipeline. The flue gas sampler 5 collects the flue gas at the optimal sampling point into the heat-insulated sampling box through the sampling pipeline; after adjusting the position of the concentration detection unit 3 to the detected plume trajectory, the peak area of the flue gas concentration is detected and identified through multiple circumferentially arranged PID sensors 4, and then the flue gas at the optimal sampling point coordinates is collected and stored in the heat-insulated sampling box through the sampling pipeline at the optimal sampling point coordinates by the flue gas sampler 5, and then transported to the on-vehicle analysis unit through the flue gas heat tracing pipe 6 for data analysis. The analyzed data is displayed on a data display screen and a test report including the total amount of TVOC (mg / m³) and characteristic components (such as benzene series, olefins, etc.) is generated. When a high-concentration carcinogen (such as benzene > 1 mg / m³) is detected, an alarm is automatically triggered.

[0038] The on-vehicle analysis unit in this embodiment includes an on-vehicle workstation and a fast gas chromatography-mass spectrometry (GC-MS). The on-vehicle workstation is equipped with the NIST 2023 spectral library and special VOCs analysis software. The analysis parameters of the fast gas chromatography-mass spectrometry (GC-MS) include chromatographic column: Rxi-5Sil MS (30 m × 0.25 mm × 0.25 μm); temperature programming: 40°C (1 min) → 20°C / min → 280°C (5 min); ionization mode: EI source (70 eV); mass range: m / z 35 - 500.

[0039] In some embodiments, such as Figure 2 、 Figure 6 and Figure 7As shown, the mobile detection platform includes a liftable sampling tower. A 360° rotating cloud platform is installed on the liftable sampling tower. The maximum extension height of the liftable sampling tower is 30 meters, and the load-bearing capacity is 200 kg. The mobile detection platform also includes a vehicle-mounted mobile chassis and an intelligent control system. The vehicle-mounted mobile chassis uses an explosion-proof special vehicle platform, integrating a hydraulic leveling system, a GPS positioning module, and an environmental meteorological station (wind speed / direction / temperature / humidity monitoring). The intelligent control system integrates a PLC control system and an industrial-grade touch screen, supporting automatic positioning and manual fine-tuning. The detection and positioning module 1 includes a detection and positioning frame 7 installed on the central axis of the rotating cloud platform. At the top of the detection and positioning frame 7, a U-shaped carrier 8 is fixed. On the outer sides of the U-shaped carrier 8, two mounting plates 9 are symmetrically fixed. A first elastic member 10 is connected to the mounting plate 9. A positioning slideway 11 is provided on the surface of the U-shaped carrier 8 along its length direction. The position of the entire detection and positioning module 1 corresponding to the detection and positioning frame 7 can be controlled by the rotating cloud platform, that is, the orientation of the entire detection and positioning module 1 is adjusted to meet the needs of flue gas collection and monitoring.

[0040] In some embodiments, as Figure 9 、 Figure 10 and Figure 11 shown, the sampling control unit 2 further includes a sampling stage 12. The heat-insulated collection box and the flue gas collector 5 are both installed on the top of the sampling stage 12. A first joint 13 is connected to the intake end of the flue gas collector 5. A flue gas collection pipe 14 communicating with the heat-insulated collection box is connected to the outlet end of the flue gas collector 5. A pressure detection pipe 15 is installed on the circumferential side of the heat-insulated collection box. A pressure gauge 16 is installed on the pressure detection pipe 15. A second joint 17 is installed at the bottom of the heat-insulated collection box. The flue gas tracing pipe 6 is connected between the vehicle-mounted analysis unit and the second joint 17. Automatic control valves 18 are installed on both the flue gas collection pipe 14 and the second joint 17. The flue gas at the optimal sampling point can be collected into the heat-insulated collection box through the flue gas collector 5 according to the corresponding collection pipeline, and the flue gas entering the heat-insulated collection box along the flue gas collection pipe 14 is transported to the vehicle-mounted analysis unit through the flue gas tracing pipe 6 for data analysis. When the automatic control valve 18 on the second joint 17 is in the closed state and the automatic control valve 18 on the flue gas collection pipe 14 is in the open state, the flue gas at the optimal sampling point can be continuously transported into the heat-insulated collection box through the flue gas collector 5, causing the internal pressure of the heat-insulated collection box to gradually increase. The internal pressure of the heat-insulated collection box is displayed in real time through the pressure gauge 16. When it is monitored that the internal pressure of the heat-insulated collection box is approaching the set threshold, at this time, opening the automatic control valve 18 on the second joint 17 can make the flue gas in the heat-insulated collection box be transported to the vehicle-mounted analysis unit through the flue gas tracing pipe 6 for data analysis. Through this pre-gas storage sampling and monitoring method, the influence on the flue gas sampling and monitoring process at the optimal sampling point caused by the change of the smoke plume trajectory can be effectively avoided.

[0041] In some embodiments, as Figure 9 、Figure 12 and Figure 13 As shown in Figure 13 , the concentration detection unit 3 further includes an arc-shaped detection frame 19. The PID sensors 4 are evenly arranged on the top of the arc-shaped detection frame 19. An arc-shaped smoke guide pipe 20 is arranged outside the arc-shaped detection frame 19. A smoke collection part 21 corresponding to the PID sensor 4 one by one is installed on the arc-shaped detection frame 19. The smoke collection part 21 is communicated with the arc-shaped smoke guide pipe 20. An automatic control valve 18 is installed on the smoke collection part 21. A third joint 22 is installed on the circumferential side of the arc-shaped smoke guide pipe 20. The third joint 22 is connected to the first joint 13 through a sampling hose 23. The collection pipeline at the corresponding position of each PID sensor 4 is composed of a smoke collection part 21, an automatic control valve 18, an arc-shaped smoke guide pipe 20, a third joint 22, a sampling hose 23 and a smoke collection pipe 14. When the smoke concentration detected by the PID sensor 4 at a certain position is the highest, the position where the PID sensor 4 is located is identified as the concentration peak area and marked as the optimal sampling point coordinate. After the optimal sampling point coordinate is detected, the automatic control valve 18 at the optimal sampling point coordinate is automatically opened, and at the same time, the automatic control valves 18 on the smoke collection pipe 14 and the second joint 17 are opened. Subsequently, the smoke collector 5 is started so that the smoke at the optimal sampling point coordinate is pumped into the heat preservation collection box. That is, under the action of the smoke collector 5, the smoke at the optimal sampling point coordinate sequentially enters the heat preservation collection box along the smoke collection part 21, the arc-shaped smoke guide pipe 20, the third joint 22, the sampling hose 23 and the smoke collection pipe 14. The smoke entering the heat preservation collection box is transported to the vehicle-mounted analysis unit along the smoke heat tracing pipe 6 for data analysis. Thus, the real-time monitoring and analysis of the plume at the flare exhaust port are realized.

[0042] Specific Embodiment 2, on the basis of Specific Embodiment 1, as Figure 9As shown in the figure, a flue gas insulation box 24 is installed on the top of the sampling stage 12, which is hermetically sleeved outside the heat-insulated sampling box. A downward exhaust pipe 25 is installed on the side surface near the top of the flue gas insulation box 24. A flue gas flow pipe 26 communicating with the flue gas insulation box 24 is installed on the flue gas collection pipe 14. An automatic control valve 18 is installed on the flue gas flow pipe 26. In order to reduce the influence caused by the change of the flue gas plume trajectory during the flue gas sampling and monitoring process, in this embodiment, the automatic control valve 18 at the optimal sampling point coordinate and the automatic control valve 18 on the flue gas collection pipe 14 are opened, so that the flue gas is pumped into and stored in the heat-insulated sampling box. When the pressure gauge 16 monitors that the internal pressure of the heat-insulated sampling box is approaching the set high threshold, the automatic control valve 18 on the flue gas collection pipe 14 is closed. At the same time, the automatic control valve 18 on the second joint 17 and the automatic control valve 18 on the flue gas flow pipe 26 are opened. At this time, the flue gas in the heat-insulated sampling box is transported along the flue gas tracing pipe 6 to the vehicle-mounted analysis unit for data analysis. During this process, the extracted flue gas is transported along the flue gas flow pipe 26 to the flue gas insulation box 24 by the flue gas sampler 5, and then discharged through the exhaust pipe 25. In this way, the heat preservation treatment of the heat-insulated sampling box inside the flue gas insulation box 24 is realized, which can effectively prevent the flue gas entering the heat-insulated sampling box from condensing and affecting the monitoring and analysis results. When the pressure gauge 16 monitors that the internal pressure of the heat-insulated sampling box is approaching the set low threshold, the automatic control valve 18 on the second joint 17 and the automatic control valve 18 on the flue gas flow pipe 26 are controlled to be closed. At the same time, the automatic control valve 18 on the flue gas collection pipe 14 is opened to collect a certain amount of flue gas again and store it in the heat-insulated sampling box. In this way, the intermittent storage sampling and monitoring of the flue gas at the optimal sampling point coordinate can be realized, which can effectively reduce the influence of the change of the flue gas plume trajectory on the flue gas sampling and monitoring results.

[0043] In some embodiments, such as Figure 8 and Figure 11 As shown in the figure, the sampling control unit 2 further includes a hollow gas gathering part 27 and a hollow air pushing part 28 (a pressure relief pipe is also provided on the hollow gas gathering part 27, and a pressure relief valve is installed on the pressure relief pipe). The hollow gas gathering part 27 is arranged inside the U-shaped carrier 8, and the hollow air pushing part 28 is arranged outside the U-shaped carrier 8. A moving part connecting the hollow gas gathering part 27 and the hollow air pushing part 28 is slidably arranged inside the positioning slideway 11. The hollow gas gathering part 27 and the hollow air pushing part 28 are communicated through a guide air hole 29. The sampling stage 12 is fixedly installed on the top of the hollow air pushing part 28. In the initial state, the hollow air pushing part 28 and the first elastic members 10 on both sides of it are in mutual contact. When the hollow gas gathering part 27 is controlled to move to the sampling and monitoring position, the hollow air pushing part 28 is squeezed with the first elastic member 10 in the corresponding direction, and the first elastic member 10 in this direction is compressed by the force.

[0044] In some embodiments, such as Figure 3 and Figure 12As shown, a moving frame 30 is slidably arranged on the top of the U-shaped carrier 8. An air supply device 31 is installed on the top of the moving frame 30. The air outlet end of the air supply device 31 is connected to an air supply pipe 32 communicating with the hollow air gathering part 27. The relative positions between the air supply device 31 and the hollow air gathering part 27 are unchanged. An automatic control valve 18 is installed on the air supply pipe 32 close to the hollow air gathering part 27. When the automatic control valve 18 on the air supply pipe 32 is opened, air is conveyed into the hollow air gathering part 27 through the air supply device 31 and the air supply pipe 32. The air entering the hollow air gathering part 27 pushes the concentration detection unit 3 along the air guide holes 29 until the concentration detection unit 3 is fitted and positioned on the circumferential side surface of the torch body 48.

[0045] The concentration detection unit 3 further includes an arc-shaped bearing frame 33. The arc-shaped detection frame 19 is installed on the top of the arc-shaped bearing frame 33. A number of rollers 34 are rotatably installed inside the arc-shaped bearing frame 33. By rolling the rollers 34 along the circumferential side of the torch body 48, the arc-shaped bearing frame 33 can move along the circumferential side of the torch body 48 until the arc-shaped bearing frame 33 moves into the plume trajectory. A first support rod 35 and a second support rod 36 are respectively fixed on the arc-shaped bearing frame 33. The first support rod 35 slidably penetrates through the moving frame 30. A support disk 37 fixed at the end of the first support rod 35 is connected to the moving frame 30 through a second elastic member 38. The second support rod 36 slidably penetrates into the inner part of the hollow air pushing part 28. A piston plate 39 fitted in the inner cavity of the hollow air pushing part 28 is fixed at the end of the second support rod 36. The piston plate 39 in the initial state is pressed against the inner wall of the hollow air pushing part 28 close to the hollow air gathering part 27. Under the combined action of the moving part and the positioning slideway 11 and the combined action of the first support rod 35 and the moving frame 30, the stable support movement of the entire concentration detection unit 3 on the U-shaped carrier 8 can be realized. During the sliding process of the moving part along the positioning slideway 11, the moving frame 30 is driven to move synchronously along the U-shaped carrier 8 through the first support rod 35, thereby realizing the synchronous movement of the entire concentration detection unit 3 with the hollow air pushing part 28 and the hollow air gathering part 27.

[0046] Specific Embodiment 3, on the basis of Specific Embodiment 1 and Embodiment 2, as Figure 3 、 Figure 7 and Figure 8As shown, horizontal sliding rods 40 are fixed on both opposite sides of the hollow air-gathering part 27. A piston disk 41 is fixedly installed on the circumferential side of the horizontal sliding rod 40. A first diversion pipe 42 corresponding to each horizontal sliding rod 40 is communicated and arranged at the bottom of the hollow air-gathering part 27. A check valve 43 is installed on the first diversion pipe 42 close to the bottom of the hollow air-gathering part 27; Two compression air pipes 44 are symmetrically fixed inside the U-shaped carrier 8. The horizontal sliding rod 40 extends into the corresponding compression air pipe 44. The piston disk 41 is slidably fitted inside the corresponding compression air pipe 44. An air release valve 46 is installed on the air release pipe 45 arranged at the end of the compression air pipe 44. A second diversion pipe 47 is communicated and arranged on the circumferential side of the compression air pipe 44. The first diversion pipe 42 is hermetically and slidably fitted inside the corresponding second diversion pipe 47. In the initial state, the hollow air-gathering part 27 is located at the middle position of the U-shaped carrier 8. Both piston disks 41 are fitted inside the corresponding compression air pipes 44. Both first diversion pipes 42 are fitted inside the corresponding second diversion pipes 47. When controlling the U-shaped carrier 8 to rotate so that the concentration detection unit 3 moves from Figure 4 the position shown to Figure 5 the position shown, at this time, the concentration detection unit 3 moves and adjusts to the plume trajectory. During this process, the piston disk 41 on the left horizontal sliding rod 40 slides along the corresponding compression air pipe 44 and compresses the air inside it, so that the compressed air enters the hollow air-gathering part 27 along the left compression air pipe 44, the second diversion pipe 47 and the first diversion pipe 42. The check valve 43 is provided to prevent the air in the hollow air-gathering part 27 from flowing back into the first diversion pipe 42. The piston disk 41 on the right horizontal sliding rod 40 disengages from the corresponding compression air pipe 44, and at the same time, the first diversion pipe 42 on the right disengages from the corresponding second diversion pipe 47.

[0047] Specific Embodiment 4. The present invention further includes a monitoring method for a torch emission flue gas emergency sampling and monitoring system, including the following steps:

[0048] S01. Perform area scanning through an infrared thermal imager to generate a temperature distribution thermal map, identify the plume trajectory. At the same time, according to the GPS coordinates and the torch position data, move the mobile detection platform (monitoring vehicle) to a position 5 meters away from the torch body 48 and stop. After the hydraulic outriggers are automatically leveled, start the on-vehicle weather station to monitor the wind speed (accuracy ±0.3 m / s), wind direction (±3°) and temperature and humidity (±1°C / ±2%RH) in real time. Automatically turn the rotating cloud platform to the target azimuth to adjust the orientation of the concentration detection unit 3. After completing the position adjustment of the concentration detection unit 3, raise the rotating cloud platform to a preset height through the liftable sampling tower. At this time, all components on the rotating cloud platform are lifted to the preset height (the rotating cloud platform is near the plume trajectory);

[0049] S02. Control the automatic control valve 18 on the gas supply pipe 32 to open, and send air into the interior of the hollow air collecting part 27 through the gas supply device 31 and the gas supply pipe 32. The air entering the hollow air collecting part 27 pushes the piston plate 39 along the air guide hole 29, so that the piston plate 39 moves along the inner cavity of the middle air pushing part 28 towards the direction close to the torch body 48. The first support rod 35 slides along the moving frame 30 and compresses the second elastic member 38 until each roller 34 on the arc-shaped bearing frame 33 fits and positions on the circumferential side surface of the torch body 48. At this time, control the automatic control valve 18 on the gas supply pipe 32 and the gas supply device 31 to close. The entire concentration detection unit 3 is tightly attached to the circumferential side surface of the torch body 48 under the action of the internal air pressure of the middle air pushing part 28 and the hollow air collecting part 27, thereby realizing the preliminary positioning of the entire concentration detection unit 3 on the torch body 48;

[0050] S03. Control the rotating cloud platform to rotate so that the U-shaped carrier 8 rotates towards the direction close to the plume trajectory. During this process, the rotating U-shaped carrier 8 drives the middle air pushing part 28 to move towards the plume direction and compresses the corresponding first elastic member 10. The moving frame 30 moves along the U-shaped carrier 8 towards the plume and compresses the second elastic member 38 under the action of the first support rod 35. The piston plate 39 gradually moves along the inner cavity of the middle air pushing part 28 away from the torch body 48. The air in the inner cavity of the middle air pushing part 28 is compressed and flows back along the air guide hole 29 into the inner cavity of the hollow air collecting part 27. Due to the compressibility of air, the entire concentration detection unit 3 is always tightly attached to the torch body 48 until the concentration detection unit 3 is moved into the plume trajectory (i.e., the sampling and monitoring position);

[0051] S04. Perform multi-point flue gas detection through multiple PID sensors 4 circumferentially arranged on the arc-shaped detection frame 19. Identify the peak flue gas concentration area through data analysis, and mark this peak concentration area as the optimal sampling point coordinates. Subsequently, control the automatic control valve 18 at the optimal sampling point coordinates and the automatic control valve 18 on the flue gas collection pipe 14 to open, so that the flue gas is pumped in and stored in the heat preservation collection box. When the pressure gauge 16 monitors that the internal air pressure of the heat preservation collection box is approaching the set high threshold, close the automatic control valve 18 on the flue gas collection pipe 14, and at the same time open the automatic control valve 18 on the second joint 17 and the automatic control valve 18 on the flue gas flow pipe 26. At this time, the flue gas in the heat preservation collection box is transported to the vehicle-mounted analysis unit along the flue gas heat tracing pipe 6 for data analysis, and the sampling flow rate (about 200 ml / min) is automatically adjusted according to the concentration gradient through the mass flow meter;

[0052] S05. During the sampling and monitoring process, the flue gas passing through the flue gas tracing pipe 6 is first preliminarily filtered to remove particulate matter through a 5-μm stainless steel filter screen, then further filtered to remove particulate matter through a PTFE membrane filter, and finally the interfering components are removed through a molecular sieve adsorption column. The collected flue gas is analyzed by fast GC-MS. The specific parameters are as follows: injection volume 1 mL, split ratio 50:1, total analysis cycle < 3 minutes; component identification is double-verified by retention index matching (error < 5%) and mass spectrometry similarity (> 85%); quantitative calculation is performed by internal standard method for concentration calibration; after the detection is completed, a test report including the total amount of TVOC (mg / m³) and characteristic components (benzene series, olefins, etc.) is generated, and an alarm is automatically triggered when a high-concentration carcinogen (such as benzene > 1 mg / m³) is detected;

[0053] S06. When the automatic control valve 18 on the second joint 17 and the automatic control valve 18 on the flue gas flow pipe 26 are opened, the extracted flue gas is transported along the flue gas flow pipe 26 to the flue gas insulation box 24 through the flue gas sampler 5, and then discharged through the exhaust pipe 25. In this way, the heat preservation treatment of the heat preservation collection box inside the flue gas insulation box 24 is realized, which can effectively prevent the flue gas entering the heat preservation collection box from condensing and affecting the monitoring and analysis results. When the pressure gauge 16 monitors that the internal pressure of the heat preservation collection box is approaching the set low threshold, the automatic control valve 18 on the second joint 17 and the automatic control valve 18 on the flue gas flow pipe 26 are controlled to close, and at the same time, the automatic control valve 18 on the flue gas sampling pipe 14 is opened to collect a certain amount of flue gas again and store it in the heat preservation collection box. In this way, the intermittent storage sampling and monitoring of the flue gas at the optimal sampling point coordinates can be realized, which can effectively reduce the influence of the change of the plume trajectory on the flue gas sampling and monitoring results;

[0054] S07. After the sampling and monitoring work of the flue gas is completed, first control the air release valve 46 close to the plume side to open, and then control the rotary cloud platform to rotate in the reverse direction so that the U-shaped carrier 8 rotates synchronously to complete the reset. At this time, the middle air pushing part 28 returns to the initial position, that is, the middle air pushing part 28 fits with the two side first elastic members 10 again (the two side first elastic members 10 are in the natural state). Subsequently, control the above-mentioned air release valve 46 to close, and control the pressure relief valve on the middle air gathering part 27 to open. At this time, the air in the cavities of the middle air gathering part 27 and the middle air pushing part 28 is discharged along the pressure relief pipe, so that the internal pressure of the cavities of the middle air gathering part 27 and the middle air pushing part 28 is consistent with the external pressure. Under the strong elastic restoring force of the second elastic member 38, the piston plate 39 is driven to move in the reverse direction to reset (the second elastic member 38 can be of industrial grade to ensure the movement and reset of the concentration detection unit 3), that is, the entire concentration detection unit 3 is reset at this time. Finally, control the pressure relief valve on the middle air gathering part 27 to close and lower the rotary cloud platform to the initial position through the liftable sampling tower frame, that is, the recovery of the entire liftable sampling tower frame is completed. In this way, the entire sampling and monitoring process of the flue gas is realized.

[0055] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0056] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. An emergency sampling and monitoring system for flue gas discharged from a torch, comprising a mobile detection platform, characterized in that, It also includes a multi-level detection module, a sampling and analysis system, and a detection and positioning module (1). The mobile detection platform is used to lift the detection and positioning module (1) to a preset height; Among them, the sampling and analysis system includes a sampling control unit (2) and a vehicle-mounted analysis unit. The sampling control unit (2) is slidably installed on the detection and positioning module (1), and the detection and positioning module (1) moves the sampling control unit (2) by rotation; The multi-level detection module includes an infrared thermal imager and a concentration detection unit (3). The infrared thermal imager is installed on the mobile detection platform and is used to detect the plume trajectory. The concentration detection unit (3) is slidably installed on the sampling control unit (2) and moves along the circumference of the torch; The concentration detection unit (3) includes a plurality of PID sensors (4), and the PID sensors (4) are used to detect the VOCs concentration at different positions of the plume; The sampling control unit (2) includes a heat-insulated collection box and a flue gas collector (5). The heat-insulated collection box is connected to the vehicle-mounted analysis unit through a flue gas trace heating pipe (6). A collection pipeline is arranged between the flue gas collector (5) and the concentration detection unit (3). Each PID sensor (4) corresponds to a collection pipeline. The flue gas collector (5) collects the flue gas at the optimal sampling point into the heat-insulated collection box through the collection pipeline.

2. The emergency sampling and monitoring system for the flue gas discharged from a torch according to claim 1, characterized in that, The mobile detection platform includes a liftable sampling tower. A rotary pan-tilt is installed on the liftable sampling tower; the detection and positioning module (1) includes a detection and positioning frame (7) installed on the central axis of the rotary pan-tilt. A U-shaped carrier (8) is fixed at the top of the detection and positioning frame (7). Two mounting plates (9) are symmetrically fixed on the outer side of the U-shaped carrier (8). A first elastic member (10) is connected to the mounting plate (9). A positioning slideway (11) is provided on the surface of the U-shaped carrier (8) along its length direction.

3. The emergency sampling and monitoring system for flare exhaust gas according to claim 2, wherein, The sampling control unit (2) also includes a sampling stage (12). The heat-insulated collection box and the flue gas collector (5) are both installed on the top of the sampling stage (12). A first joint (13) is connected to the inlet end of the flue gas collector (5). A flue gas collection pipe (14) communicating with the heat-insulated collection box is connected to the outlet end of the flue gas collector (5). A pressure detection pipe (15) is installed on the circumferential surface of the heat-insulated collection box. A pressure gauge (16) is installed on the pressure detection pipe (15). A second joint (17) is installed at the bottom of the heat-insulated collection box. The flue gas trace heating pipe (6) is connected between the vehicle-mounted analysis unit and the second joint (17). Automatic control valves (18) are installed on both the flue gas collection pipe (14) and the second joint (17).

4. The emergency sampling and monitoring system for flare exhaust gas according to claim 3, wherein, The concentration detection unit (3) further includes an arc-shaped detection frame (19). The PID sensors (4) are uniformly arranged on the top of the arc-shaped detection frame (19). An arc-shaped smoke guide pipe (20) is arranged outside the arc-shaped detection frame (19). A smoke collection part (21) corresponding to the PID sensor (4) one by one is installed on the arc-shaped detection frame (19). The smoke collection part (21) is communicated with the arc-shaped smoke guide pipe (20). An automatic control valve (18) is installed on the smoke collection part (21). A third joint (22) is installed on the circumferential side of the arc-shaped smoke guide pipe (20). The third joint (22) is connected with the first joint (13) through a sampling hose (23).

5. The emergency sampling and monitoring system for flare exhaust gas according to claim 4, characterized in that, A smoke insulation box (24) which is hermetically sleeved outside the heat preservation collection box is installed on the top of the sampling stage (12). A downward exhaust pipe (25) is installed on the circumferential side of the smoke insulation box (24) close to the top. A smoke flow pipe (26) communicated with the smoke insulation box (24) is installed on the smoke collection pipe (14). An automatic control valve (18) is installed on the smoke flow pipe (26).

6. The emergency sampling and monitoring system for flare exhaust gas according to claim 5, characterized in that, The sampling control unit (2) further includes a hollow air-gathering part (27) and a hollow air-pushing part (28). The hollow air-gathering part (27) is arranged inside the U-shaped carrier (8). The hollow air-pushing part (28) is arranged outside the U-shaped carrier (8). A moving part connecting the hollow air-gathering part (27) and the hollow air-pushing part (28) is slidably arranged inside the positioning slideway (11). The hollow air-gathering part (27) is communicated with the hollow air-pushing part (28) through an air guide hole (29). The sampling stage (12) is fixedly installed on the top of the hollow air-pushing part (28). The hollow air-pushing part (28) is in contact with the first elastic members (10) on both sides of it.

7. An emergency sampling and monitoring system for flue gas discharged from a torch according to claim 6, characterized in that, A moving frame (30) is slidably arranged on the top of the U-shaped carrier (8). An air supply device (31) is installed on the top of the moving frame (30). The air outlet end of the air supply device (31) is connected with an air supply pipe (32) communicated with the hollow air-gathering part (27). An automatic control valve (18) is installed on the air supply pipe (32) close to the position of the hollow air-gathering part (27). The concentration detection unit (3) further includes an arc-shaped bearing frame (33). The arc-shaped detection frame (19) is installed on the top of the arc-shaped bearing frame (33). A plurality of rollers (34) are rotatably installed inside the arc-shaped bearing frame (33). A first support rod (35) and a second support rod (36) are respectively fixed on the arc-shaped bearing frame (33). The first support rod (35) slidably penetrates through the moving frame (30). A support disc (37) fixed at the end of the first support rod (35) is connected with the moving frame (30) through a second elastic member (38). The second support rod (36) slidably penetrates into the hollow air-pushing part (28). A piston plate (39) which is fitted inside the cavity of the hollow air-pushing part (28) is fixed at the end of the second support rod (36).

8. The emergency sampling and monitoring system for the flue gas discharged from a torch according to claim 7, characterized in that, On both opposite sides of the hollow air-gathering part (27), horizontal sliding rods (40) are fixedly installed. On the circumferential surface of the horizontal sliding rod (40), a piston disc (41) is fixedly installed. At the bottom of the hollow air-gathering part (27), first diversion pipes (42) corresponding to the horizontal sliding rods (40) one by one are communicated. On the first diversion pipe (42) near the bottom of the hollow air-gathering part (27), a one-way valve (43) is installed. On the inner side of the U-shaped carrier (8), two compression air pipes (44) are symmetrically fixed. The horizontal sliding rod (40) extends into the corresponding compression air pipe (44). The piston disc (41) is slidably fitted inside the corresponding compression air pipe (44). On the air release pipe (45) arranged at the end of the compression air pipe (44), an air release valve (46) is installed. On the circumferential surface of the compression air pipe (44), a second diversion pipe (47) is communicated. The first diversion pipe (42) is hermetically and slidably fitted inside the corresponding second diversion pipe (47).

9. The monitoring method of the emergency sampling and monitoring system according to claim 8, wherein, It includes the following steps: S01. Identify the plume trajectory through an infrared thermal imager, then automatically turn the rotating cloud platform to the target orientation to adjust the orientation of the concentration detection unit (3). After completing the position adjustment of the concentration detection unit (3), raise the rotating cloud platform to a preset height through the liftable sampling tower. S02. Deliver air into the hollow air-gathering part (27). The air entering the hollow air-gathering part (27) pushes the piston plate (39) along the air guide holes (29). The first support rod (35) slides along the moving frame (30) and compresses the second elastic member (38) until each roller (34) on the arc-shaped carrier (33) fits and positions on the circumferential surface of the torch body (48). S03. Control the rotating cloud platform to rotate so that the U-shaped carrier (8) rotates towards the plume trajectory direction. The rotating U-shaped carrier (8) drives the middle air-pushing part (28) to move towards the plume. The moving frame (30) synchronously moves along the U-shaped carrier (8) towards the plume under the action of the first support rod (35). The piston plate (39) gradually moves along the inner cavity of the middle air-pushing part (28) away from the torch body (48). The air in the inner cavity of the middle air-pushing part (28) is compressed and flows back into the inner cavity of the hollow air-gathering part (27) along the air guide holes (29) until the concentration detection unit (3) is moved into the plume trajectory. S04. After identifying the optimal sampling point coordinates through the PID sensor, draw the flue gas at the optimal sampling point coordinates into the heat preservation collection box for storage. When the pressure gauge (16) monitors that the internal pressure of the heat preservation collection box is approaching the set high threshold, the flue gas in the heat preservation collection box is transported to the vehicle-mounted analysis unit through the flue gas heat tracing pipe (6) for data analysis. When a high-concentration carcinogen is detected, an alarm is automatically triggered. S05. When the pressure gauge (16) monitors that the internal air pressure of the heat preservation collection box is approaching the set high threshold value, when the automatic control valve (18) on the second joint (17) and the automatic control valve (18) on the flue gas flow-through pipe (26) are opened, the extracted flue gas is transported along the flue gas flow-through pipe (26) to the flue gas heat preservation box (24) through the flue gas collector (5), and then discharged through the exhaust pipe (25) to realize the heat preservation treatment of the heat preservation collection box; S06. When the pressure gauge (16) monitors that the internal air pressure of the heat preservation collection box is approaching the set low threshold value, control to close the automatic control valve (18) on the second joint (17) and the automatic control valve (18) on the flue gas flow-through pipe (26), and at the same time open the automatic control valve (18) on the flue gas collection pipe (14) to collect a certain amount of flue gas again and store it in the heat preservation collection box.

Images