A multi-component exhaust gas synchronous detection device for stationary pollution sources

Abstract

This invention discloses a synchronous detection device for multi-component exhaust gas from stationary pollution sources, relating to the field of exhaust gas detection technology. It includes: a detection mechanism and a sampling tube, with a pretreatment mechanism fixedly connected to one end of the sampling tube, and a sampling pump fixedly installed between the pretreatment mechanism and the detection mechanism; and a centrifugal dehydration component disposed inside the sampling tube. This invention achieves exhaust gas-driven operation through the centrifugal dehydration component, controlling the separation and closure of the annular scraper strips through centrifugal force. It requires no additional electrical components or external power source, relying entirely on the flow energy of the exhaust gas itself to automatically scrape away condensate from the inner wall of the sampling tube after each exhaust gas extraction. This achieves timely cleaning, significantly reduces the maintenance costs of manual periodic purging, minimizes downtime, significantly improves detection accuracy and data reliability, and realizes intelligent, automatic, and passive discharge of condensate.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas detection technology, specifically to a device for simultaneous detection of multi-component exhaust gas from stationary pollution sources. Background Technology

[0002] The exhaust gases emitted from stationary pollution sources (such as coal-fired boilers, industrial kilns, and waste incinerators) contain a variety of gaseous pollutants (such as SO2, NOx, CO, and VOCs) as well as particulate matter. Synchronous, continuous, and accurate monitoring of these gases is a key aspect of environmental protection and pollution control. Currently, extraction-type multi-component exhaust gas synchronous detection devices are widely used in the monitoring of emissions from stationary pollution sources. These devices typically consist of a sampling head, a pretreatment system, analytical instruments, and a sampling pump.

[0003] However, in practical engineering applications, the condensate generated in the aforementioned multi-component exhaust gas detection devices is a very troublesome problem in exhaust gas detection. Condensate can have a serious impact on exhaust gas detection devices in many ways, from data accuracy to equipment safety. The most direct and fatal blow to the accuracy of detection data is that condensate makes the measurement data unreliable, because condensate will cause the target gas to dissolve and be lost. In particular, sulfur dioxide (SO2), nitrogen oxides (NO2, especially nitrogen dioxide), ammonia (NH3), and hydrogen chloride (HCl) in exhaust gases are all gases that are highly soluble in water, resulting in a significant reduction in the concentration of the gas entering the analyzer. The final measurement results are seriously low, misleading environmental protection judgments. Existing technologies mostly rely on manual periodic disassembly of pipelines for purging or cleaning to solve the condensate problem. This method involves a large amount of maintenance work, long downtime, and cannot achieve timely cleaning after each sampling. Summary of the Invention

[0004] The purpose of this invention is to provide a synchronous detection device for multi-component exhaust gas from stationary pollution sources. This invention solves the problem that condensate generated in traditional synchronous detection devices for multi-component exhaust gas from stationary pollution sources can affect the accuracy of the data. Existing technologies often rely on manual periodic disassembly of pipelines for purging or cleaning to remove condensate, which involves a large amount of maintenance work, long downtime, and the inability to achieve timely cleaning after each sampling.

[0005] This invention solves the above-mentioned technical problems through the following technical solution: A synchronous detection device for multi-component exhaust gas from a stationary pollution source, comprising: The testing mechanism and the sampling tube are provided, with a pretreatment mechanism fixedly connected to one end of the sampling tube, and a sampling pump fixedly installed between the pretreatment mechanism and the testing mechanism. A centrifugal dewatering assembly is disposed inside the sampling tube. After each extraction of waste gas, the centrifugal dewatering assembly cleans the condensate generated on the inner wall of the sampling tube. The centrifugal dewatering assembly includes an installation rod that rotates inside the sampling tube via two support arms, a centrifugal component, a drying component, and a self-draining component. One end of the installation rod is fixed with a fan blade, and two sleeve arms are slidably sleeved on the outside of the installation rod. The two sleeve arms are staggered at ninety degrees. Annular strips are fixed on both sleeve arms, and annular scraper strips are fixed on the outer walls of both annular strips. Annular water guide rings are fixed on one side of both annular strips.

[0006] Preferably, an annular groove is provided on one side of the sleeve arm, and a limiting groove is provided on the outer side wall of the mounting rod. Two centrifugal components are provided, and the two centrifugal components are arranged symmetrically. Each centrifugal component includes multiple buckle plates fixed to the outer side wall of the mounting rod and an annular ring sleeved on the outer side of the mounting rod. The inner side wall of the annular ring slides on the inner side of the limiting groove through a limiting block. The annular ring slides on the inner side of the annular groove. Three ropes are fixed on one side of the annular ring. All three ropes are threaded through the multiple buckle plates, and a centrifugal ball is fixed to one end of each of the three ropes.

[0007] Preferably, the centrifugal component further includes an outer spring fixed between the multi-plate and the annular ring, and a corrugated folded isolation tube. The outer spring is sleeved on the outside of the mounting rod, and the corrugated folded isolation tube is sleeved on the outside of the outer spring.

[0008] Preferably, two drying components are provided, which are arranged opposite to each other. Each drying component includes an air supply component and an air jet component. The air supply component includes two hollow rods fixed to the inner wall of the sampling tube. Both hollow rods are inserted into the same sleeve arm. Each hollow rod has at least two transverse slots. Each hollow rod is fitted with two corrugated folded protective tubes. One end of each corrugated folded protective tube is fixed to both sides of the sleeve arm, and the other end of each corrugated folded protective tube is fixed to both ends of the hollow rod.

[0009] Preferably, the air supply component further includes two pistons respectively disposed inside the hollow rod frame, a one-way air inlet valve pipe fixed to one end of the two hollow rod frames, and a one-way air outlet corrugated telescopic pipe. Each of the two pistons is fixed with a push-pull rod, one end of which slides in two transverse grooves on the two hollow rod frames and is fixedly connected to the sleeve arm. One end of each of the two one-way air inlet valve pipes extends to the outside of the sampling tube.

[0010] Preferably, the jetting component includes an annular tube fixed to the outer wall of the annular strip, and jet nozzles arranged in a ring on the annular tube. One end of each of the two unidirectional air-outlet corrugated telescopic tubes is connected to the annular tube.

[0011] Preferably, the sampling tube has a water outlet at its bottom, and the self-draining component includes a water collection box fixed to the bottom of the sampling tube. The bottom of the water collection box has a drain outlet, and the top of the water collection box has double-sided water inlet grooves. The inner side wall of the water collection box has two symmetrically arranged vertical grooves, and a horizontal bar slides between the two vertical grooves. A U-shaped strip is fixed to the bottom of the horizontal bar, and a sealing plug is fixed to one end of the U-shaped strip. A U-shaped floating plate is provided inside the water collection box, and a through strip is fixed to the inside of the U-shaped floating plate. The through strip passes through the inside of the U-shaped strip.

[0012] Preferably, two positioning grooves are provided on the inner sidewalls of the two vertical grooves, and inner grooves are provided at both ends of the crossbar. An inner spring is fixed on the inner side of each of the two inner grooves, and a positioning head slides on the inner side of each of the two inner grooves.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The centrifugal dewatering component is designed to drive the exhaust gas process. The centrifugal force controls the opening and closing of the annular scraper strip. No additional electrical components or external power source are required. The system relies entirely on the flow energy of the exhaust gas itself to automatically scrape off the condensate on the inner wall of the sampling tube after each exhaust gas extraction. This achieves timely cleaning, significantly reduces the maintenance cost of manual periodic purging, minimizes downtime, and significantly improves detection accuracy and data reliability. It also enables intelligent, automatic, and passive discharge of condensate. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention when the drill bit is not started; Figure 2 This is a schematic diagram of the overall structure of the drill bit after startup in this invention; Figure 3 for Figure 1 A sectional view; Figure 4 This is a schematic diagram showing the disassembly of the centrifugal self-lifting component, the resetting pressure component, and the partial self-cleaning component in this invention; Figure 5 This is an exploded sectional view of the connecting rod frame and the partial air supply component in this invention; Figure 6 This is a partial sectional view of the drill pipe and drill bit in this invention; Figure 7 This is an exploded sectional view of the connecting rod frame and the partial air supply component in this invention; Figure 8 This is a partial cross-sectional view of the drill pipe and drill bit in this invention.

[0015] 1. Testing facility; 2. Sampling tube; 3. Pretreatment facility; 4. Sampling pump; 5. Centrifugal dewatering assembly; 51. Mounting rod; 52. Fan blade; 53. Sleeve arm; 54. Annular strip; 55. Annular scraper strip; 56. Annular water guide ring; 57. Limiting groove; 58. Multi-plate buckle; 59. Annular ring; 510. Rope; 511. Centrifugal ball; 512. Outer spring; 513. Corrugated folded isolation tube; 514. Hollow rod frame; 515. Horizontal groove; 516. Corrugated folded protective tube; 517. Piston; 5 18. One-way air intake valve pipe; 519. One-way air outlet corrugated telescopic pipe; 520. Push-pull rod; 521. Ring pipe; 522. Air nozzle; 523. Water collection box; 524. Double-sided water inlet channel; 525. Vertical channel; 526. Horizontal bar; 527. I-shaped strip; 528. Sealing plug head; 529. I-shaped float plate; 530. Through strip; 531. Positioning groove; 532. Inner groove; 533. Inner spring; 534. Positioning head; 6. Water outlet. Detailed Implementation

[0016] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.

[0017] This invention provides a technical solution: a device for simultaneous detection of multi-component exhaust gas from stationary pollution sources, such as... Figures 1-8 As shown, the system includes a detection mechanism 1, a sampling tube 2, a pretreatment mechanism 3, a sampling pump 4, and a centrifugal dehydration assembly 5. The pretreatment mechanism 3 is located at one end of the sampling tube 2, and the sampling pump 4 is located between the pretreatment mechanism 3 and the detection mechanism 1. The detection mechanism 1 is the detection area of ​​the entire device, where the sample gas is finally analyzed to obtain the pollutant concentration, which is used to accurately measure the concentration of target pollutants such as SO2 and NOx in the sample gas. It utilizes various physical and optical principles to measure the sample gas entering the analysis chamber. The sampling tube 2 is responsible for extracting representative raw exhaust gas from the flue, completing representative sample collection and moisture-controlled transmission under harsh environments (high temperature, high humidity, high dust). During installation, a stable exhaust gas sampling area is selected to avoid interference. It is usually selected in a vertical pipe section and located in the negative pressure zone of the flue to facilitate sampling. Similarly, the installation point must avoid bends, valves, and other components in the flue. After the sampling pump 4 is started, the sampling tube 2 relies on the suction of the sampling pump 4 to draw the flue gas into the flue. The pretreatment unit 3 is the "cleanroom" of the system. Before the sample gas is tested, it needs to be strictly purified here. It mainly performs water removal, dust removal, and constant flow treatment on the high-temperature and high-humidity sample gas to provide the testing unit 1 with dry and stable sample gas. It first undergoes condensation and water removal (the high-temperature sample gas is rapidly cooled by a condenser (such as a Peltier electronic condenser), and water vapor is liquefied into water). Then it is automatically drained (the condensate flows into the storage tank and is automatically discharged periodically or continuously by a peristaltic pump). Then it is finely filtered (the dry sample gas passes through a fine filter to completely intercept tiny particles). Finally, it is adjusted by flow regulation (the sample gas is adjusted to the stable flow rate required by the testing unit 1 using a needle valve and a flow meter). Sampling pump 4 is the power source for the entire gas circulation, mainly providing a continuous pumping power to ensure stable flow of sample gas in sampling tube 2 and pretreatment mechanism 3. If sampling pump 4 is a diaphragm pump, it uses a motor to drive the diaphragm to reciprocate, changing the pump chamber volume to pump and compress gas. Because the sample gas is isolated from moving parts, it will not contaminate the sample gas. If sampling pump 4 is a jet pump, it uses high-speed compressed air to form negative pressure to extract sample gas. It has no moving parts, requires no electricity, and has extremely high reliability. It is particularly suitable for explosion-proof or high-temperature tracing applications. In conventional cold dry method systems, the pump is usually installed after pretreatment mechanism 3 and before detection mechanism 1; in hot wet method systems, it is installed after detection mechanism 1, and the sample gas is extracted after the measurement is completed.

[0018] The centrifugal dewatering component 5 is located inside the sampling tube 2. After each extraction of exhaust gas, the centrifugal dewatering component 5 cleans the condensate generated on the inner wall of the sampling tube 2, preventing the condensate from causing serious impacts on the detection device, affecting both data accuracy and equipment safety. The centrifugal dewatering component 5 includes a mounting rod 51, a centrifugal component, a drying component, and a self-draining component, all rotatably mounted on the center of the inner side of the sampling tube 2 via two support arms. A fan blade 52 is fixed to the end of the mounting rod 51 near the connection to the flue. Two sleeve arms 53 are slidably fitted onto the outside of the mounting rod 51, staggered at a 90-degree angle. An annular strip 54 is fixed to each of the two sleeve arms 53 (between their ends), meaning the sleeve arms 53 are fixed to the inner wall of the annular strip 54. An annular scraper that fits against the inner wall of the sampling tube 2 is fixed to the outer wall of each of the two annular strips 54. For the complex working conditions inside the sampling tube 2, which simultaneously faces high temperature and continuous reciprocating friction from acidic condensate, a single-material annular scraper strip 55 is unlikely to meet all requirements. The safest option is to adopt a combined structure. The main body can be made of polytetrafluoroethylene (PTFE), and the working surface (i.e., the outer surface of the annular scraper strip 55) is bonded or laminated with a layer of fluororubber. This solution takes into account the self-lubricating, high temperature resistance, and chemical corrosion resistance of PTFE, and the excellent elasticity and sealing scraping ability of fluororubber. Annular water guide rings 56 are fixed on opposite sides of the two annular strips 54. When the two annular strips 54 are closest, the two annular scraper strips 55 are in contact. At this time, the two annular water guide rings 56 are also in contact with each other. When the annular scraper strip 55 scrapes away the condensate on the inner wall of the sampling tube 2, the condensate will flow along the annular water guide rings 56 to the lower position of the sampling tube 2, preventing the scraped condensate from dripping everywhere.

[0019] An annular groove is provided on one side of the sleeve arm 53 (located on the outer ring of the mounting rod 51), and at least one limiting groove 57 is provided on the outer wall of the mounting rod 51. Two centrifugal components are provided, arranged symmetrically. Each centrifugal component includes a multi-fastening plate 58 fixed to the outer wall of the mounting rod 51 and an annular ring 59 sleeved on the outer side of the mounting rod 51. The multi-fastening plate 58 is an annular plate with multiple holes. The inner wall of the annular ring 59 slides on the inner side of the limiting groove 57 through a limiting block, so that when the mounting rod 51 rotates, the annular ring 59 can only rotate with the mounting rod 51, and the annular ring 59 can only rotate in a certain direction. The groove of the limiting groove 57 moves horizontally on the mounting rod 51. The annular ring 59 slides inside the annular groove. Three ropes 510 are fixed on one side of the annular ring 59. The three ropes 510 are respectively threaded into three corresponding holes on the multi-buckle plate 58. The number of holes on the multi-buckle plate 58 should be the same as the number of ropes 510. Two ropes 510 can also be set. The specific number depends on the actual situation. Regardless of the number of ropes 510, they are arranged in a ring. The holes on the multi-buckle plate 58 are also arranged in a ring. One end of each of the three ropes 510 is fixed with a centrifugal ball 511.

[0020] The centrifugal component also includes an outer spring 512 fixed between the multi-button plate 58 and the annular ring 59, and a corrugated folded isolation tube 513. The outer spring 512 is sleeved on the outside of the mounting rod 51, and the corrugated folded isolation tube 513 is sleeved on the outside of the outer spring 512. The corrugated folded isolation tube 513 protects the outer spring 512 to prevent it from rusting. The centrifugal ball 511 is the source of the pulling force, and the magnitude of its centrifugal force determines whether the system can start. The mass of the centrifugal ball 511 must be large enough to generate sufficient centrifugal force, but the mass cannot be too large, so as to avoid the outer spring 512 from being impacted or unable to fall back due to excessive inertia when it resets. When the centrifugal ball 511 is pulled by the centrifugal force to the annular ring 59 to fit against the multi-button plate 58, the centrifugal ball 511 will straighten the rope 510 and rotate around the mounting rod 51 as the center, just like the fan blade 52, in the sampling tube 2. At this time, the centrifugal ball 511 will not touch the inner wall of the sampling tube 2.

[0021] The rope 510 should be made of a material with good wear resistance, low elongation, and low breakage. It should also have certain corrosion resistance and temperature resistance. Recommended materials include: 316L stainless steel micro wire rope (high strength, wear resistance, and corrosion resistance) and ultra-high molecular weight polyethylene fiber rope (high strength, wear resistance, and self-lubricating, but its temperature resistance is not as good as steel wire). The outer spring 512 is the core of the entire mechanism. It stores energy and releases it when the air supply stops, driving the annular wiper blade 55 to work. The functional conditions must meet the following: During air extraction, the centrifugal force generated by the centrifugal ball 511 must be large enough to overcome the maximum elastic force of the outer spring 512, as well as the annular ring 59, sleeve arm 53, annular bar 54, and annular wiper blade 55 through the rope 510. The weight and friction of the annular water guide ring 56, as well as the friction generated when the piston 517 is pulled, are necessary to fully pull the annular wiper blade 55 apart by the centrifugal force of the centrifugal ball 511 when the mounting rod 51 rotates. After the pumping stops, the reaction force of the outer spring 512 (i.e., its ability to return to its original shape) must be able to overcome all the above-mentioned resistances and the resistance of the moving structure generated when the outer spring 512 resets, pushing the annular wiper blade 55 back to its original position to complete the cleaning. These data must be determined through precise calculations and experiments, because the outer spring 512 undergoes a "compression-release" cycle every time the device starts and stops, which is a high-cycle fatigue condition. Therefore, materials with excellent fatigue resistance, such as oil-quenched and tempered alloy spring steel or stainless steel, must be selected.

[0022] There are two drying components, arranged opposite each other at a 90-degree angle, so they do not obstruct each other. Each drying component includes an air supply component and an air jet component. The air supply component includes two symmetrically arranged hollow rods 514 fixed to the inner wall of the sampling tube 2. Both hollow rods 514 are mounted on the same sleeve arm 53, meaning the sleeve arm 53 can slide on the hollow rods 514. This restricts the movement trajectory of the sleeve arm 53 and the annular bar 54, ensuring they can only move in a straight line and preventing the annular bar 54 from following the mounting rod 51 and the annular bar 54. The ring 59 rotates together, and at least two transverse grooves 515 are provided on each of the two hollow rods 514. In this embodiment, four transverse grooves 515 are arranged in a ring. Two corrugated folded protective tubes 516 are fitted on each of the two hollow rods 514. One end of the two corrugated folded protective tubes 516 is fixed to both sides of the sleeve arm 53, and the other end of the two corrugated folded protective tubes 516 is fixed to both ends of the hollow rod 514. The hollow rod 514 is wrapped by the two corrugated folded protective tubes 516 to protect its internal structure.

[0023] The gas supply component also includes two pistons 517 respectively disposed inside the hollow rod frame 514, a one-way inlet valve pipe 518 fixed to one end of the two hollow rod frames 514, and a one-way outlet corrugated telescopic pipe 519. The one-way inlet valve pipe 518 is equipped with a one-way valve, allowing gas to enter the hollow rod frame 514 but not exit. The one-way outlet corrugated telescopic pipe 519 is also equipped with a one-way valve, allowing gas to exit the hollow rod frame 514 but not enter. Since the one-way valve is a mature existing technology, it will not be described in detail here; those skilled in the art can adjust and use it as needed. The one-way outlet corrugated telescopic pipe 519 can automatically... The length of the line is adapted so as not to affect the connection between the hollow rod frame 514 and the annular tube 521. Push-pull rods 520 are fixed on both pistons 517. One end of each push-pull rod 520 slides in the two transverse grooves 515 on the two hollow rod frames 514 and is fixedly connected to the sleeve arm 53. The air supply components used by the two annular bars 54 are symmetrically arranged, that is, the transverse grooves 515 on the hollow rod frames 514 in the two air supply components are arranged in opposite directions. One end of each of the two one-way air inlet valve pipes 518 extends to the outside of the sampling tube 2 and is equipped with a removable filter screen to filter the external air and prevent dust in the external air from entering the hollow rod frame 514.

[0024] The jetting component includes an annular tube 521 fixed to the outer wall of the annular bar 54, such as... Figure 8 As shown, the annular pipe 521 is located on the other side of the annular strip 54 where the annular water guide ring 56 is located. The annular pipe 521 is provided with air nozzles 522 arranged in a ring. The air nozzles 522 are oriented towards the position of the annular wiper strip 55. One end of each of the two one-way air outlet corrugated telescopic pipes 519 is connected to the annular pipe 521, so that the gas pushed out by the piston 517 in the hollow rod frame 514 enters the annular pipe 521.

[0025] The sampling tube 2 has an outlet 6 at its bottom, positioned in the middle when the two annular bars 54 are closed. The self-draining component includes a water collection box 523 fixed to the bottom of the sampling tube 2. The bottom of the water collection box 523 has a drain outlet, and the top of the water collection box 523 has double-sided water inlet channels 524. The openings of the double-sided water inlet channels 524 on the water collection box 523 are located at the outlet 6. Figure 6As shown, the double-sided water channel 524 guides condensate water to flow down the inner wall of the water collection box 523. The inner wall of the water collection box 523 has two symmetrically arranged vertical channels 525. A horizontal bar 526 slides between the two channels 525. A U-shaped strip 527 is fixed to the bottom of the horizontal bar 526. One end of the U-shaped strip 527 is fixed with a sealing plug 528 inserted into the drain outlet. A U-shaped float plate 529 is installed inside the water collection box 523. A through strip 530 is fixed to the inside of the U-shaped float plate 529 and passes through the inside of the U-shaped strip 527. When the U-shaped strip 527 pulls the horizontal bar 526 upwards to the top of the vertical channel 525, the highest water level should be at the top of the vertical channel 525. At the bottom, two positioning grooves 531 are formed on the inner sidewalls of the two vertical grooves 525. Inner grooves 532 are formed at both ends of the crossbar 526. Inner springs 533 are fixed to the inner sides of both inner grooves 532. Positioning heads 534 slide on the inner sides of both inner grooves 532. When the crossbar 526 is at the lower end of the vertical groove 525, the positioning head 534 inserts into one positioning groove 531 to position the crossbar 526. When the crossbar 526 is at the upper end of the vertical groove 525, the positioning head 534 inserts into the other positioning groove 531 to position the crossbar 526. This maintains the position of the sealing plug 528 to achieve drainage and close the drain outlet. Closing the drain outlet is to prevent external air from entering the sampling tube 2. Figure 6 As shown, the shape of the sealing plug 528 and the drain outlet have a certain height so that when the crossbar 526 is moved up and down later, the positioning head 534 has time to move from one positioning groove 531 to another positioning groove 531.

[0026] In use: Start the sampling pump 4 to draw air. Under its suction, the exhaust gas in the chimney (flue) is drawn to the pretreatment unit 3 through the sampling pipe 2. The exhaust gas undergoes dehumidification, dust removal and flow stabilization in the pretreatment unit 3 and becomes a dry sample gas with a stable flow rate. Then it enters the detection unit 1 to analyze the concentration of target pollutants such as SO2 and NOx in the exhaust gas. Finally, the exhaust gas after detection and analysis is discharged through a special outlet on the detection unit 1.

[0027] When the sampling tube 2 is drawing air, the high-speed airflow drives the fan blade 52 to rotate. The fan blade 52 drives the mounting rod 51 to rotate, which in turn drives the external annular ring 59 and the multi-fastening plate 58 to rotate at high speed. Under the action of centrifugal force, the centrifugal ball 511 overcomes its own weight and the tension of the rope 510 and is thrown outward. The centrifugal ball 511 pulls the rope 510 taut. During this process, the annular ring 59 is pulled along the limiting groove 57 by the rope 510. When the annular ring 59 rotates, it rotates in the annular groove and does not drive the sleeve arm 53 to rotate. Furthermore, as the annular ring 59 moves along the mounting rod 51, it pulls the sleeve arm 53 to move along the mounting rod 51, thereby causing the two sleeve arms 53 to move away from each other, causing the two annular bars 54 to gradually open. At the same time, as the annular ring 59 moves, it will compress the outer spring 512. Finally, when the centrifugal ball 511 is centrifuged, the annular wiper bar 55 is pulled by the annular bar 54 to a position closer to the air outlet. That is, the annular bar 54 will move to a position closer to one end of the hollow rod frame 514, in a clean standby state, which does not affect the normal exhaust gas detection during this period. When exhaust gas extraction stops, the condensate cleaning process begins. Fan blade 52 loses power, its speed decreases, and it eventually stops. Centrifugal force disappears, and under the reaction force of the outer spring 512, the annular ring 59 gradually moves back. The return of the annular ring 59 pulls the rope 510 and the centrifugal ball 511 back to their original positions. At the same time, it pushes the sleeve arm 53 back on the mounting rod 51, thereby causing the annular strip 54 to drive the annular scraper strip 55 to scrape the condensate on the inner wall of the sampling tube 2 in one direction. The scraped condensate flows down along the annular water guide ring 56 until the two annular strips 54 close. At this time, the scraped condensate is pushed to the outlet 6 and flows down the double-sided water guide grooves 524 to the water collection box 523 for collection. It uses the exhaust gas flow itself as the only power source and does not require external energy. When the gas is being extracted, the annular scraper strip 55 retracts, which does not affect the airflow and detection. After the gas is stopped, the annular scraper strip 55 scrapes the condensate on the inner wall of the sampling tube 2, achieving self-cleaning.

[0028] As the condensate level rises, the U-shaped float plate 529 rises with the level, causing the threaded bar 530 to rise within the U-shaped bar 527. Once the threaded bar 530 reaches the top of the U-shaped bar 527, its continued ascent pulls the crossbar 526 and the U-shaped bar 527 upwards. The positioning head 534 on the crossbar 526, pulled by the U-shaped float plate 529, compresses the inner spring 533, disengaging it from the corresponding positioning slot 531. When the crossbar 526 rises to the other positioning slot 531 corresponding to the positioning head 534, the positioning head 534, under the elastic force of the inner spring 533, can engage with the corresponding positioning slot. 531 limits itself, thereby causing the sealing plug 528 to detach from the drain outlet and be limited, allowing condensate to drain from the collection box 523. Then, the U-shaped float 529 descends with the liquid level to the bottom of the U-shaped strip 527 after the strip 530 descends. Its own weight presses the U-shaped strip 527 down, thereby causing the crossbar 526 to move down until the positioning head 534 is engaged in the original positioning groove 531. At this time, the sealing plug 528 will re-insert into the drain outlet to seal the collection box 523, preventing outside air from entering the sampling tube 2 through the collection box 523 after the condensate is drained, thus affecting the test results.

[0029] It is important to note that when the centrifugal ball 511 moves, causing the sleeve arm 53 to move, the sleeve arm 53 will pull the push-pull rod 520 connected to it. The push-pull rod 520 will then pull the piston 517 to move and draw external air into the hollow rod frame 514 for storage through the one-way air intake valve pipe 518. When the air extraction stops and the water is scraped, the sleeve arm 53 will drive the push-pull rod 520 to move back, thereby causing the piston 517 to move back and send the previously stored gas into the annular pipe 521 through the one-way air outlet corrugated telescopic pipe 519. Then, it will be sprayed through the nozzle 522 onto the inner wall of the sampling tube 2 that has been scraped by the annular water scraper 55, drying the residual very thin water film. This prevents the water film residue from causing the subsequent dissolution of acidic gases such as SO2 and NOx, significantly improving the measurement accuracy. Timely drying of the residual water film can effectively prevent acidic liquid from wetting the pipe wall for a long time and delay the electrochemical corrosion of stainless steel or carbon steel pipes.

[0030] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A device for simultaneous detection of multi-component exhaust gas from stationary pollution sources, characterized in that, include: The testing mechanism (1) and the sampling tube (2) are provided. One end of the sampling tube (2) is fixedly connected to the pretreatment mechanism (3), and a sampling pump (4) is fixedly installed between the pretreatment mechanism (3) and the testing mechanism (1). Centrifugal dewatering assembly (5) is located inside the sampling tube (2). The centrifugal dewatering assembly (5) cleans the condensate generated on the inner wall of the sampling tube (2) after each extraction of waste gas. The centrifugal dewatering assembly (5) includes an installation rod (51) that rotates inside the sampling tube (2) via two support arms, a centrifugal component, a drying component, and a self-collecting and draining component. One end of the installation rod (51) is fixed with a fan blade (52). Two sleeve arms (53) are slidably sleeved on the outside of the installation rod (51). The two sleeve arms (53) are staggered at ninety degrees. Annular strips (54) are fixed on both sleeve arms (53). Annular scraper strips (55) are fixed on the outer walls of both annular strips (54). Annular water guide rings (56) are fixed on one side of both annular strips (54).

2. The device for simultaneous detection of multi-component exhaust gas from stationary pollution sources according to claim 1, characterized in that, An annular groove is provided on one side of the sleeve arm (53), and a limiting groove (57) is provided on the outer side wall of the mounting rod (51). Two centrifugal components are provided, and the two centrifugal components are arranged symmetrically. The centrifugal component includes a multi-buckle plate (58) fixed to the outer side wall of the mounting rod (51) and an annular ring (59) sleeved on the outer side of the mounting rod (51). The inner side wall of the annular ring (59) slides on the inner side of the limiting groove (57) through the limiting block. The annular ring (59) slides on the inner side of the annular groove. Three ropes (510) are fixed on one side of the annular ring (59). All three ropes (510) are threaded on the multi-buckle plate (58), and a centrifugal ball (511) is fixed at one end of each of the three ropes (510).

3. The device for simultaneous detection of multi-component exhaust gas from stationary pollution sources according to claim 2, characterized in that, The centrifugal component also includes an outer spring (512) fixed between the multi-button plate (58) and the annular ring (59) and a corrugated folded isolation tube (513). The outer spring (512) is sleeved on the outside of the mounting rod (51), and the corrugated folded isolation tube (513) is sleeved on the outside of the outer spring (512).

4. The device for simultaneous detection of multi-component exhaust gas from stationary pollution sources according to claim 1, characterized in that, Two drying components are provided, and the two drying components are arranged opposite to each other. The drying components include an air supply component and an air jet component. The air supply component includes two hollow rods (514) fixed to the inner side wall of the sampling tube (2). The two hollow rods (514) are both installed on the same sleeve arm (53). At least two transverse grooves (515) are opened on the two hollow rods (514). Two corrugated folded protective tubes (516) are sleeved on the two hollow rods (514). One end of the two corrugated folded protective tubes (516) is fixed to both sides of the sleeve arm (53), and the other end of the two corrugated folded protective tubes (516) is fixed to both ends of the hollow rods (514).

5. The device for simultaneous detection of multi-component exhaust gas from stationary pollution sources according to claim 4, characterized in that, The gas supply component also includes two pistons (517) respectively disposed inside the hollow rod frame (514), a one-way air inlet valve pipe (518) fixed to one end of the two hollow rod frames (514), and a one-way air outlet corrugated telescopic pipe (519). Each of the two pistons (517) is fixed with a push-pull rod (520). One end of each push-pull rod (520) slides in two transverse grooves (515) on the two hollow rod frames (514) and is fixedly connected to the sleeve arm (53). One end of each of the two one-way air inlet valve pipes (518) extends to the outside of the sampling tube (2).

6. The device for simultaneous detection of multi-component exhaust gas from stationary pollution sources according to claim 5, characterized in that, The jet component includes an annular tube (521) fixed to the outer wall of the annular strip (54), and jet nozzles (522) arranged in a ring on the annular tube (521). One end of each of the two unidirectional air outlet corrugated telescopic tubes (519) is connected to the annular tube (521).

7. The device for simultaneous detection of multi-component exhaust gas from stationary pollution sources according to claim 1, characterized in that, The sampling tube (2) has an outlet (6) at its bottom. The self-draining component includes a water collection box (523) fixed to the bottom of the sampling tube (2). The bottom of the water collection box (523) has a drain outlet. The top of the water collection box (523) has a double-sided water inlet groove (524). The inner wall of the water collection box (523) has two symmetrically arranged vertical grooves (525). A horizontal bar (526) slides between the two vertical grooves (525). A cross bar (527) is fixed at the bottom of the horizontal bar (526). A sealing plug (528) is fixed at one end of the cross bar (527). A cross bar-shaped floating plate (529) is provided on the inner side of the water collection box (523). A through strip (530) is fixed on the inner side of the cross bar (529). The through strip (530) passes through the inner side of the cross bar (527).

8. The device for simultaneous detection of multi-component exhaust gas from stationary pollution sources according to claim 7, characterized in that, Two positioning grooves (531) are provided on the inner sidewalls of the two vertical grooves (525), and two inner grooves (532) are provided at both ends of the crossbar (526). An inner spring (533) is fixed on the inner side of each of the two inner grooves (532), and a positioning head (534) slides on the inner side of each of the two inner grooves (532).

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