A device for detecting the content of carbon dioxide in petrochemical combustion

Abstract

The present application relates to carbon dioxide detection technology field, specifically to a kind of petrochemical combustion carbon dioxide content detection equipment, including non-dispersive infrared gas analyzer, the non-dispersive infrared gas analyzer outside is shell, the non-dispersive infrared gas analyzer is provided with gas inlet, exhaust port, the gas inlet is inserted with sampling tube, one end of the sampling tube is sampling head, the inside of the sampling head is provided with the backflow prevention structure of gas, when potential backflow occurs, reverse airflow attempts to enter from the small mouth end of fairing, at this time, the flow resistance of intercepting groove is substantially increased, due to the existence of intercepting groove, reverse airflow needs to overcome greater resistance to pass through, and the gas of backflow bounces back after impacting the baffle at one end of fairing, realize the blocking when gas backflow, the design of conical fairing also shrinks the passage of backflow gas, further improve the resistance, therefore effectively inhibit the reverse flow of gas to prevent its backflow.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide detection technology, specifically to a device for detecting carbon dioxide content in petrochemical combustion. Background Technology

[0002] Petrochemical combustion refers to the process of burning fossil fuels such as oil, natural gas, and coal, converting these hydrocarbons into carbon dioxide and water with the participation of oxygen, while releasing heat energy for power generation, heating, or industrial production. This is particularly true in the oil refining process, which often produces coke or residual char. These byproducts typically need to be incinerated in specific combustion furnaces to achieve energy recovery or waste treatment. The flue gas produced by this combustion process has a complex composition and a high CO2 content, thus requiring strict monitoring. The industry uses non-dispersive infrared gas analyzers to detect the carbon dioxide concentration in the gas, and then monitors the air environment by displaying the carbon dioxide concentration in the analyzer.

[0003] The working principle of a non-dispersive infrared gas analyzer is based on the absorption characteristics of gas molecules to infrared radiation of a specific wavelength. By emitting an infrared light source, the light passes through the gas sample to be tested in the sample chamber, and the detector measures the change in the intensity of the residual light, thereby calculating the concentration of the target gas (such as carbon dioxide) in the gas. Furthermore, before the gas enters the sample chamber, it passes through a filter screen and desiccant on the inner wall to remove moisture and particulate impurities from the gas, thereby improving the accuracy of the detection.

[0004] However, existing non-dispersive infrared gas analyzers have the following drawbacks:

[0005] (1) When the gas acquisition system (composed of sampling tube, sampling head, and air pump) and the analysis system experience sudden pressure changes, valve or check valve damage, poor pipeline sealing, or unreasonable design, gas flows in the opposite direction of the inlet direction. This process is called "backflow". "Backflow" disrupts the stability and consistency of gas flow inside the gas analyzer. The gas to be measured, which should flow unidirectionally through the gas chamber, is diluted or interfered with by the backflowing gas, causing the proportion of gas components in the gas chamber to deviate from the actual concentration, thus causing measurement errors. Existing non-dispersive infrared gas analyzers cannot achieve the function of preventing backflow.

[0006] (2) During petrochemical combustion, moisture in the fuel and water vapor in the combustion products are discharged along with the flue gas. When the sampling tube collects the flue gas, moisture in the flue gas also enters. Moisture interferes with the transmission of infrared light, affecting the accurate detection of the target gas. In addition, excessive moisture may also cause condensation inside the instrument, corroding circuits or optical components, causing instrument corrosion, mirror contamination, and measurement errors, affecting the normal operation and long-term stability of the equipment. Although the existing method of using desiccants to remove moisture can reduce the interference of moisture on the analyzer to a certain extent, the dehumidification effect is limited, and the removed moisture is directly lost, making it impossible to recycle the removed moisture, resulting in resource waste and environmental burden.

[0007] (3) When existing non-dispersive infrared gas analyzers use a filter screen to filter impurities in flue gas, the filter screen is exposed to a flue gas environment with high humidity and high particulate matter content for a long time. The coke dust in the flue gas gradually accumulates and blocks the mesh, resulting in increased gas flow resistance, decreased flow rate, or even complete blockage. This blockage will not only prolong the gas detection response time but also reduce the detection accuracy. Summary of the Invention

[0008] The purpose of this invention is to provide a device for detecting carbon dioxide content in petrochemical combustion, so as to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a petrochemical combustion carbon dioxide content detection device, comprising a non-dispersive infrared gas analyzer, wherein the non-dispersive infrared gas analyzer is externally housed, and is provided with an air inlet and an exhaust outlet. A sampling tube is inserted into the air inlet, one end of the sampling tube being a sampling head. The sampling head is internally provided with a gas backflow prevention structure, which prevents the extracted gas from flowing back out, thereby ensuring the continuity and accuracy of the detection data. The housing is internally provided with a pretreatment structure for filtering and dehumidifying the gas. An external collection container of the non-dispersive infrared gas analyzer is convenient for receiving water discharged from the two exhaust pipes.

[0010] Preferably, the anti-backflow structure includes a flow guide shroud fixed to the inner wall of the sampling head, the flow guide shroud and the sampling head forming a flow interception groove, and a dehumidification unit is provided inside the sampling head. The dehumidification unit includes a cavity provided in the inner wall of the flow guide shroud, and a condenser plate is installed inside the cavity.

[0011] Preferably, the non-dispersive infrared gas analyzer is provided with a collection structure, which includes a flow guide groove provided on the inner wall of the flow guide hood, a baffle provided at the end of the flow guide hood with a smaller diameter, a water tank provided inside the housing, a groove provided on the sampling head, a water guide pipe connected to the sampling head at the groove, and the end of the water guide pipe connected to the water tank.

[0012] Preferably, the housing has an internal cooling structure, which includes heat dissipation holes. The housing has two sets of interconnected hollow tubes attached to its interior. A micro pump is installed on the top of the water tank. The pump's suction pipe is located inside the water tank. The pump's discharge pipe is connected to the hollow tubes. A water level sensor is installed inside the water tank. The bottom of the water tank is connected to a first drain pipe, which is connected to a solenoid valve.

[0013] Preferably, the pretreatment structure includes a treatment box, a perforated plate fixed to the bottom of the inner cavity of the treatment box, a micro motor installed on the outer wall of the treatment box, a movable shaft rotatably connected inside the treatment box, a pressure rod fixed to the outside of the movable shaft, a sliding groove provided on the inner wall of the treatment box, and a grooved plate and a pressure plate slidably connected along the sliding groove, the grooved plate and the pressure plate being connected by a hollow plate, dry particles being placed inside the hollow plate, a shielding plate magnetically connected to the side of the hollow plate and the top of the treatment box, and the shielding plate on the side of the hollow plate being provided with a round hole, and a filter screen being inserted into the groove of the grooved plate.

[0014] Preferably, the side wall of the treatment box is fixed with a spring and a top block, and the spring is fixedly connected to the groove plate. The filter screen is fixed with an extension plate. An electric push rod is fixedly installed on the top of the hollow plate, and the output end of the electric push rod passes through the extension plate. One side of the treatment box is a water-absorbing sponge with irregular holes. The pressure plate is located on one side of the water-absorbing sponge and has a transverse groove through it to facilitate water flow. The bottom of the treatment box at the bottom of the perforated plate is a water collection tank. The water collection tank is connected to a second drain pipe, and the second drain pipe is also connected to a solenoid valve.

[0015] Preferably, the housing is equipped with an air pump and a sample chamber for sampling gas. The air pump is connected to the air inlet through a first pipe, the air pump is connected to the processing box through a second pipe, the processing box is connected to the sample chamber through a third pipe, and the sample chamber is connected to the exhaust port.

[0016] Preferably, the top of the housing is covered by a cover via a detachable structure. A sealing strip and a vertical plate are fixed to the bottom of the cover. A first insertion port is passed through the vertical plate. The detachable structure includes a damping shaft rotatably connected to the inner wall of the housing. A disc and a turntable are fixed to both ends of the damping shaft, respectively. The disc is located inside the housing, and the turntable is located outside the housing. The disc is provided with an arc-shaped groove. A support block is fixed to the inner wall of the housing. A plug is slidably connected inside the support block. A second insertion port is provided on the inner wall of the housing. A protrusion is fixed to one end of the plug, and the protrusion extends into the arc-shaped groove.

[0017] Preferably, a sealing groove is provided at the top of the housing, and a flexible air cushion is provided at the bottom of the inner cavity of the sealing groove.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. When flue gas enters through the sampling tube, the flow guide hood adopts a conical design, with one end being a large opening and the other end a small opening. During normal sampling, the flue gas flows smoothly from the large opening. When potential backflow occurs, the reverse airflow attempts to enter from the small opening of the flow guide hood. At this time, the intercepting groove will significantly increase the airflow resistance. Due to the presence of the intercepting groove, the reverse airflow needs to overcome greater resistance to pass through. Furthermore, the backflowing gas bounces back after hitting the baffle at one end of the flow guide hood, thus blocking the backflow of gas. At the same time, the conical design of the flow guide hood also narrows the channel of the backflowing gas, further increasing the resistance. Therefore, it effectively suppresses the reverse flow of gas and prevents it from flowing back.

[0020] 2. The condenser plate cools the entire flow guide shroud. As the gas passes through the shroud, its temperature decreases, causing moisture in the gas to condense into water droplets on the inner wall of the shroud. This, combined with subsequent dehumidification using drying particles, achieves excellent dehumidification. The condensed water droplets then flow along the flow channel to the small opening in the shroud, entering a groove inside the sampling head. From there, they flow through a water pipe into the water tank, allowing for the collection and utilization of the condensed water droplets. This condensate is used to further cool the interior of the casing. In summary, the sampling head prevents backflow of flue gas, dehumidifies the incoming flue gas, and the resulting condensate cools the interior of the casing, achieving a synergistic effect among these three functions.

[0021] 3. When the filter screen becomes clogged, the micro motor can be started to drive the movable shaft and pressure rod to rotate. When the pressure rod rotates, it pushes the output end of the electric push rod to move. Then, the parts related to the electric push rod move synchronously. The groove plate moves, taking the filter screen with it and stretching the spring. When the filter screen moves to the appropriate distance, the output end of the electric push rod retracts. Then, the spring quickly resets, taking the filter screen back to its original position and impacting the top block. The rebound force and impact force of the filter screen eject the impurities that clog the mesh, thus achieving cleaning. Attached Figure Description

[0022] Figure 1 This is an external view of the non-dispersive infrared gas analyzer of the present invention;

[0023] Figure 2 For the present invention Figure 1 Schematic diagram of a partial structure;

[0024] Figure 3 This is a schematic diagram of the external cone structure of the drainage cone of the present invention;

[0025] Figure 4 This is a schematic diagram of the inner cone structure of the drainage cone of the present invention;

[0026] Figure 5 For the present invention Figure 2 Sectional view;

[0027] Figure 6 This is an enlarged view of point M in the present invention;

[0028] Figure 7 This is a schematic diagram of the internal structure of the non-dispersive infrared gas analyzer of the present invention;

[0029] Figure 8 For the present invention Figure 6 Schematic diagram of a partial structure;

[0030] Figure 9 This is a schematic diagram of the outer casing and cover of the present invention;

[0031] Figure 10 This is a top view of the interior of the outer casing of the present invention;

[0032] Figure 11 This is a schematic diagram of the interior of the processing box of the present invention;

[0033] Figure 12 For the present invention Figure 9 A schematic diagram after rotation.

[0034] Figure 13 This is a cross-sectional view of the processing box of the present invention;

[0035] Figure 14 This is a schematic diagram of the hollow plate and shield structure of the present invention;

[0036] Figure 15 This is an enlarged view of point Q in the present invention;

[0037] Figure 16 This is a schematic diagram of the disassembly and assembly structure of the present invention;

[0038] Figure 17 This is a schematic diagram of the bottom structure of the shell cover of the present invention.

[0039] The components represented by each number in the attached diagram are listed below: 1. Non-dispersive infrared gas analyzer; 2. Housing; 3. Air inlet; 4. Exhaust outlet; 5. Sampling tube; 6. Sampling head; 7. Flow guide; 8. Flow interception groove; 9. Cavity; 10. Condenser; 11. Water tank; 12. Baffle; 13. Water guide pipe; 14. Heat dissipation hole; 15. Hollow tube; 16. Micro pump; 17. Processing box; 18. Orifice plate; 19. Micro motor; 20. Movable shaft; 21. Pressure rod; 22. Slide groove; 23. Slot plate; 24. Pressure plate; 25. Hollow plate; 26. Drying granules; 27. Baffle; 28. Filter screen; 29. ​​Spring; 30. Top block; 31. Extension plate; 32. Electric push rod; 33. Absorbent sponge; 34. Horizontal groove; 35. Water collection tank; 36. Air pump; 37. Sample chamber; 38. First pipe; 39. Second pipe; 40. Third pipe; 41. Shell cover; 42. Sealing strip; 43. Vertical plate; 44. First socket; 45. Damping shaft; 46. Disc; 47. Turntable; 48. Arc groove; 49. Support block; 50. Insert rod; 51. Second socket; 52. Protrusion; 53. Sealing groove; 54. Flexible air cushion; 55. Flow guide groove; 56. Groove; 57. Flow guide cone; 58. Outer cone opening; 59. Spiral pattern; 60. Inner cone opening; 61. Flat surface. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] This invention provides a technical solution: such as Figures 1-15 The device for detecting carbon dioxide content in petrochemical combustion shown includes a non-dispersive infrared gas analyzer 1. The non-dispersive infrared gas analyzer 1 is enclosed in a housing 2. The non-dispersive infrared gas analyzer 1 is provided with an air inlet 3 and an exhaust port 4. A sampling tube 5 is inserted into the air inlet 3. One end of the sampling tube 5 is a sampling head 6. The sampling head 6 is provided with a gas backflow prevention structure to prevent the extracted gas from flowing back and being discharged, thereby ensuring the continuity and accuracy of the detection data. The housing 2 is provided with a pretreatment structure for filtering and dehumidifying the gas.

[0042] Furthermore, the anti-backflow structure includes a flow guide shroud 7 fixed to the inner wall of the sampling head 6, forming a flow interception groove 8 between the flow guide shroud 7 and the sampling head 6. A dehumidification unit is provided inside the sampling head 6, including a cavity 9 on the inner wall of the flow guide shroud 7. A condenser plate 10 is installed inside the cavity 9. A flow guide cone 57 is fixed to one end of the sampling head 6. One end of the flow guide cone 57 is an outer cone 58 with a spiral pattern 59 on its surface. The other end of the flow guide cone 57 is an inner cone 60 and a flat plate 61. The non-dispersive infrared gas analyzer 1 is provided with a collection structure, including a flow guide groove 55 on the inner wall of the flow guide shroud 7. A condenser plate 10 is installed at the end of the flow guide shroud 7 with a smaller diameter. The baffle 12 and the housing 2 are equipped with a water tank 11 inside. The sampling head 6 is provided with a groove 56. The sampling head 6 is connected to a water guide pipe 13 at the groove 56, and the end of the water guide pipe 13 is connected to the water tank 11. The housing 2 is equipped with a cooling structure inside, which includes heat dissipation holes 14. The housing 2 is attached with two sets of interconnected hollow tubes 15 inside. The top of the water tank 11 is equipped with a micro pump 16. The water pump 16's suction pipe is located inside the water tank 11. The micro pump 16's drain pipe is connected to the hollow tube 15. The water tank 11 is equipped with a water level sensor inside. The bottom of the water tank 11 is connected to a first drain pipe, and the first drain pipe is connected to a solenoid valve.

[0043] In an exemplary manner, the air pump 36 is activated, and gas is drawn in through the sampling head 6 and sampling tube 5. Because the guide hood 7 adopts a conical design, with a large opening at one end and a small opening at the other, the flue gas flows smoothly in from the large opening during normal sampling. When potential backflow occurs, the reverse airflow attempts to enter from the small opening of the guide hood 7. At this time, the intercepting groove 8 significantly increases the airflow resistance. Due to the presence of the intercepting groove 8, the reverse airflow needs to overcome greater resistance to pass through. Furthermore, the backflowing gas bounces back after impacting the baffle 12 at one end of the guide hood 7, thus blocking the backflow. Simultaneously, the conical design of the guide hood 7 also narrows the channel for the backflowing gas, further increasing the resistance. Therefore, it effectively suppresses the reverse flow of gas and prevents backflow. The gas is then condensed by the condenser plate 10. The overall cooling of the guide shroud 7 causes the temperature of the gas to drop as it passes through the guide shroud 7. By lowering the gas temperature, the moisture in the gas condenses into water droplets on the inner wall of the guide shroud 7, thus achieving dehumidification. When the gas enters from the outer cone 58, it is first diffused by the spiral pattern 59 on the outer cone 58. At the same time, the rotation causes the gas to collide with the cooled inner wall of the guide shroud 7 at high speed and rotate rapidly, thereby accelerating the gas cooling efficiency and shortening the time for water droplet formation. The water droplets are then quickly gathered by the centrifugal force of rotation to form liquid water and be discharged. The conical design of the guide cone 57 is more conducive to the entry of gas. When the gas flows backward, the inner cone 60 and the flat plate 61 form a gas shield, which, together with the intercepting groove 8, forms a gas trap. Through this dual cooperation, the backflow of gas is greatly prevented. Then, the condensed water droplets flow along the guide groove 55 to the small opening of the guide shroud 7. The outflowing water enters the groove 56 inside the sampling head 6, and then enters the water tank 11 through the water guide pipe 13, thereby realizing the collection and utilization of the condensed water droplets. The condensed water is used to achieve subsequent cooling. In summary, the sampling head 6 realizes both the backflow of gas and the dehumidification of the incoming gas. Then, the condensed water generated by dehumidification achieves the cooling of the inside of the shell 2, thereby realizing the linkage effect between the three.

[0044] Furthermore, the pretreatment structure includes a treatment box 17. A perforated plate 18 is fixed to the bottom of the inner cavity of the treatment box 17. A micro motor 19 is installed on the outer wall of the treatment box 17. A movable shaft 20 is rotatably connected inside the treatment box 17. A pressure rod 21 is fixed to the outside of the movable shaft 20. A groove 22 is provided on the inner wall of the treatment box 17, and a groove plate 23 and a pressure plate 24 are slidably connected along the groove 22. The groove plate 23 and the pressure plate 24 are connected by a hollow plate 25. Dry particles 26 are placed inside the hollow plate 25. A shield 27 is magnetically connected to the side of the hollow plate 25 and the top of the treatment box 17. The shield 27 on the side of the hollow plate 25 has a round hole. A filter screen 28 is inserted into the groove of the groove plate 23. A spring 29 and a top block 30 are fixed to the side wall of the treatment box 17, and the spring 29 is fixedly connected to the groove plate 23. The filter screen 28 is fixed... An extension plate 31 is provided. An electric push rod 32 is fixedly installed on the top of the hollow plate 25, and the output end of the electric push rod 32 passes through the extension plate 31. One side of the processing box 17 is a water-absorbing sponge 33 with irregular holes. A pressure plate 24 is located on one side of the water-absorbing sponge 33, and a transverse groove 34 passes through the pressure plate 24 to facilitate water flow. The bottom of the processing box 17 is a water collection tank 35 located at the bottom of the perforated plate 18. The water collection tank 35 is connected to a second drain pipe, and the second drain pipe is also connected to a solenoid valve. An air pump 36 is installed inside the housing 2, and a sample chamber 37 for sampling gas is provided. The air pump 36 is connected to the air inlet 3 through the first pipe 38, and the air pump 36 is connected to the processing box 17 through the second pipe 39. The processing box 17 and the sample chamber 37 are connected through the third pipe 40, and the sample chamber 37 is connected to the exhaust port 4.

[0045] Specifically, the incoming gas passes through the absorbent sponge 33, where impurities and residual moisture are filtered out. Additionally, moisture is absorbed by the dry particles 26 inside the baffle 27 on the hollow plate 25, achieving another form of dehumidification. These three dehumidification processes significantly improve dehumidification efficiency. Impurities are then filtered again through the filter screen 28. This dual filtration by the absorbent sponge 33 and filter screen 28 greatly enhances the filtration effect, preventing impurities in the gas from causing detection errors. The gas then enters the sample chamber 37 through the third pipe 40. However, if the filter screen 28 becomes clogged or the absorbent sponge 33 becomes saturated, the micro motor 19 can be activated to rotate the movable shaft 20 and the pressure rod 21. When the pressure rod 21 rotates, it pushes the output end of the electric push rod 32, causing related parts to move synchronously. The plate 23 moves, carrying the filter screen 28 and stretching the spring 29. When the filter screen 28 moves to a suitable distance, the output end of the electric push rod 32 retracts, and then the spring 29 quickly resets, carrying the filter screen 28 back to its original position and impacting the top block 30. The rebound force and impact force of the filter screen 28 eject the impurities clogging the mesh, achieving cleaning. The sliding groove 22 provides support for the movement of the trough plate 23. At the same time, the movement of the trough plate 23 carries the pressure plate 24 through the hollow plate 25. When the pressure plate 24 moves, it presses the water-absorbing sponge 33, which helps to squeeze out the water in the water-absorbing sponge 33 to prevent it from becoming saturated and facilitates its long-term use. The horizontal groove 34 on the pressure plate 24 facilitates the passage of squeezed water and gas. The squeezed water comes into the water collection tank 35 through the perforated plate 18. The second drain pipe is activated by the solenoid valve to drain the water in the water collection tank 35.

[0046] Furthermore, the top of the housing 2 is covered by a cover 41 via a detachable structure. A sealing strip 42 and a vertical plate 43 are fixed to the bottom of the cover 41. The vertical plate 43 has a first insertion port 44 extending through it. The detachable structure includes a damping shaft 45 rotatably connected to the inner wall of the housing 2. A disc 46 and a turntable 47 are fixed to both ends of the damping shaft 45, respectively. The disc 46 is located inside the housing 2, and the turntable 47 is located outside the housing 2. The disc 46 has an arc-shaped groove 48. A support block 49 is fixed to the inner wall of the housing 2. A rod 50 is slidably connected inside the support block 49. A second insertion port 51 is provided on the inner wall of the housing 2. A protrusion 52 is fixed to one end of the rod 50, and the protrusion 52 extends into the arc-shaped groove 48. A sealing groove 53 is provided on the top of the housing 2, and a flexible air cushion 54 is provided at the bottom of the inner cavity of the sealing groove 53. After the non-dispersive infrared gas analyzer 1 is repaired, the cover 41 is reset. At this time, the damping shaft 45 and the disc 46 are rotated by the turntable 47. Since the protrusion 52 is located inside the arc groove 48, the two insertion rods 50 move in opposite directions and pass through the first insertion port 44 on the vertical plate 43 into the second insertion port 51 on the inner wall of the housing 2. The cover 41 is then installed on the top of the housing 2, which is convenient. A dustproof net is provided at the heat dissipation hole 14. At the same time, when the cover 41 is reset, the sealing strip 42 at the bottom will enter the sealing groove 53 at the top of the housing 2 and press the flexible air cushion 54 in the sealing groove 53. The flexible air cushion 54 deforms and fills the gap between the sealing groove 53 and the sealing strip 42, which helps to prevent dust from entering from the connection between the housing 2 and the cover 41, thereby preventing dust from affecting the internal electronic components.

[0047] Specifically, gas backflow can cause sample gas to be expelled in the opposite direction or mixed with outside air, leading to environmental contamination and distorted sample composition, severely affecting the accuracy of test results. Furthermore, backflow can cause unstable internal pressure within the equipment, damaging sensors and analytical instruments, shortening equipment lifespan, and even posing safety hazards. Therefore, preventing gas backflow is crucial for ensuring the reliability of test data and the safe operation of equipment.

[0048] It should be noted that a high-precision electrochemical or NDIR auxiliary gas sensor is added to sample chamber 37 to monitor the concentrations of interfering gases such as CO, CH4, and CO2 in real time. This sensor is connected to the equipment via RS485 or 4-20mA signal to provide data compensation to correct the impact of cross-interference on CO2 measurement.

[0049] In addition, the sampling head 6 avoids the flue vortex area, prioritizes the upper part of the vertical pipe to reduce dust accumulation, and has an insertion depth greater than or equal to 1 / 3 of the flue diameter to ensure representative sampling.

[0050] Furthermore, the sampling tube 5, sampling head 6, and water guide tube 13 are all flexible and telescopic, and the sampling tube 5, sampling head 6, and water guide tube 13 can all be replaced with longer tubes according to the actual working conditions.

[0051] In the next step, the condenser plate 10 uses an aluminum nitride ceramic substrate with a thermal conductivity of ≥180W / m·K and a temperature resistance of 800℃ as the core carrier. The surface is coated with a 0.1mm thick platinum layer with a melting point of 1772℃ as a heat reflective layer to prevent damage from high-temperature gases and achieve active protection. The condenser plate 10 achieves rapid cooling of the gas.

[0052] It should be noted that the non-dispersive infrared gas analyzer 1 requires an external collection container to receive the water discharged from the two drain pipes.

[0053] As demonstrated, since the two baffles 27 are magnetically attached to the hollow plate 25 and the processing box 17, opening the baffles 27 opens the processing box 17, allowing the dry granules 26 to be replaced. Afterward, when the filter screen 28 can no longer be used, it can be pulled out from the slot plate 23 for replacement. It should be noted that the filter screen 28 has a service life of one year, but a pretreatment structure is needed to clean the filter screen 28 to prevent clogging. The cleaning cycle is once every two months.

[0054] Furthermore, this explains why the disassembly and assembly structure of the housing 2 and the cover 41 has four significant advantages over traditional bolted connections: First, improved operational efficiency, as the cover 41 can be locked / unlocked in just three seconds by rotating the turntable 47, whereas traditional bolts require tightening one by one (at least four bolts, taking more than two minutes); Second, superior sealing performance, as the flexible air cushion 54 can form a gapless seal under compression, far exceeding the planar pressure seal of bolted connections; Third, enhanced anti-loosening reliability, as the torque resistance of the damping shaft 45, combined with the mechanical interlock of the insertion rod 50, can resist vibration and shock, avoiding the common problem of bolt loosening due to vibration; Fourth, reduced maintenance costs, eliminating the need for special tools and eliminating the risk of thread wear.

[0055] Working principle: The non-dispersive infrared gas analyzer 1 is installed at the location where gas sampling is required. Then, the sampling tube 5 is inserted into the outside of the air inlet 3 to establish a connection. After that, the sampling head 6 is placed at the flue of the petrochemical combustion exhaust. Through the set anti-backflow structure, the air pump 36 is started, and the gas is drawn in through the sampling head 6 and the sampling tube 5. Since the flow guide 7 adopts a conical design with a large opening at one end and a small opening at the other end, the flue gas flows in smoothly from the large opening end during normal sampling. When potential backflow occurs, the reverse airflow attempts to enter from the small opening end of the flow guide 7. At this time, the intercepting groove 8 will greatly increase the airflow resistance. Due to the presence of the intercepting groove 8, the reverse airflow needs to overcome greater resistance to pass through. Moreover, the backflowing gas hits the baffle 12 at one end of the flow guide 7 and bounces back, thus blocking the backflow of gas. At the same time, the design of the conical flow guide 7 will also narrow the channel of the backflowing gas, further increasing the resistance. Therefore, it effectively suppresses the reverse flow of gas and prevents it from flowing back.

[0056] The overall temperature of the guide shroud 7 is reduced by the condenser plate 10. When the gas passes through the guide shroud 7, the temperature decreases accordingly. By reducing the gas temperature, the moisture in the gas condenses into water droplets on the inner wall of the guide shroud 7, thus achieving dehumidification. In addition, when the gas enters from the outer cone 58, it is first diffused by the spiral pattern 59 on the outer cone 58. At the same time, the rotation causes the gas to collide with the cooled guide shroud 7 wall at high speed and rotate rapidly, thereby accelerating the gas cooling efficiency and shortening the time for water droplet formation. The water droplets are quickly gathered by the centrifugal force of rotation to form liquid water and be discharged. The conical design of the guide cone 57 is more conducive to the entry of gas. When the gas flows backward, the inner cone 60 and the flat plate 61 block to form a gas shroud. At the same time, it works together with the intercepting groove 8 to form a gas trap. Through the double cooperation, the backflow of gas is greatly blocked. Then, the condensed water droplets flow along the guide groove 55 to the small opening of the guide shroud 7. The outflowing water enters the groove 56 inside the sampling head 6, and then enters the water tank 11 through the water guide pipe 13, thereby realizing the collection and utilization of the condensed water droplets. The condensed water is used to achieve subsequent cooling. In summary, the sampling head 6 realizes both the backflow of gas and the dehumidification of the incoming gas. Then, the condensed water generated by dehumidification achieves the cooling of the inside of the shell 2, thereby realizing the linkage effect between the three.

[0057] The micro pump 16 is started to draw out the condensate in the water tank 11 through the water pipe, and then drain it into the hollow tube 15 through the drain pipe. The condensate then flows inside the hollow tube 15 to form a closed-loop cooling water circuit, thereby removing the heat inside the shell 2 to protect the internal electronic components. In conjunction with the heat dissipation hole 14, the cooling effect is greatly improved. The water tank 11 monitors the liquid level in real time through the water level sensor. When the water level reaches the threshold, the solenoid valve opens and the first drain pipe automatically drains the water.

[0058] The drawn-in gas enters the interior of the processing chamber 17 through the first pipe 38 and the second pipe 39. The gas passes through the absorbent sponge 33 and is filtered to remove impurities and residual moisture. In addition, the moisture passes through the baffle 27 on the hollow plate 25 and is absorbed by the dry particles 26 inside, achieving another form of dehumidification. These three dehumidification processes significantly improve the dehumidification efficiency. Furthermore, the pores on the absorbent sponge 33 can significantly enhance its effect of filtering impurities and moisture from the gas. In addition, the pores provide a larger specific surface area, making the gas flow smoother and increasing the contact area of ​​the filter medium, which helps to capture tiny dust, dirt, and particulate impurities, thereby improving the filtration efficiency. Because the absorbent sponge 33 expands after absorbing moisture, and its pores also promote moisture evaporation or drying, it reduces the accumulation of moisture in the absorbent sponge 33 and lowers the risk that the absorbent sponge 33 will become unusable after being saturated with water. Then, impurities are filtered again through the filter screen 28. The double filtration by the absorbent sponge 33 and the filter screen 28 greatly improves the filtration effect and prevents impurities in the gas from causing errors in the detection. Afterward, the gas enters the interior of the sample chamber 37 through the third pipe 40. Then, by emitting an infrared light source, the light passes through the gas sample to be tested in the sample chamber 37, and the detector measures the change in the intensity of the residual light, thereby calculating the concentration of the target gas, such as carbon dioxide, in the gas, and thus realizing the detection of the carbon dioxide content in the gas.

[0059] However, if the filter screen 28 becomes clogged or the absorbent sponge 33 becomes saturated, the micro motor 19 can be activated to drive the movable shaft 20 and the pressure rod 21 to rotate. When the pressure rod 21 rotates, it pushes the output end of the electric push rod 32 to move. Then, the parts associated with the electric push rod 32 move synchronously. The groove plate 23 moves, taking the filter screen 28 with it and stretching the spring 29. When the filter screen 28 moves to a suitable distance, the output end of the electric push rod 32 retracts. Then, the spring 29 quickly resets, taking the filter screen 28 back to its original position and striking the top block 30. Through the return of the filter screen 28... The elasticity and impact force eject impurities clogging the mesh, achieving cleaning. The sliding groove 22 provides support for the movement of the trough plate 23. At the same time, the movement of the trough plate 23 carries the pressure plate 24 through the hollow plate 25. When the pressure plate 24 moves, it presses the water-absorbing sponge 33, which helps to squeeze out the water in the water-absorbing sponge 33 to prevent it from becoming saturated and facilitates its long-term use. The horizontal groove 34 on the pressure plate 24 facilitates the passage of squeezed water and gas. The squeezed water enters the water collection tank 35 through the perforated plate 18. The second drain pipe is activated by the solenoid valve to drain the water in the water collection tank 35.

[0060] After the non-dispersive infrared gas analyzer 1 is repaired, the cover 41 is reset. At this time, the damping shaft 45 and the disk 46 are rotated by the turntable 47. Since the protrusion 52 is located inside the arc groove 48, the two insertion rods 50 move in opposite directions and pass through the first insertion port 44 on the vertical plate 43 into the second insertion port 51 on the inner wall of the housing 2. The cover 41 is then installed on the top of the housing 2, which is convenient. At the same time, when the cover 41 is reset, the sealing strip 42 at the bottom will enter the sealing groove 53 at the top of the housing 2 and press the flexible air cushion 54 in the sealing groove 53. The flexible air cushion 54 deforms and fills the gap between the sealing groove 53 and the sealing strip 42, which helps to prevent dust from entering from the connection between the housing 2 and the cover 41, thereby preventing dust from affecting the internal electronic components. A dustproof net is provided at the heat dissipation hole 14.

[0061] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0062] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A petrochemical combustion carbon dioxide content detection device, comprising a non-dispersive infrared gas analyzer (1), wherein the non-dispersive infrared gas analyzer (1) is externally a housing (2), the non-dispersive infrared gas analyzer (1) is provided with an air inlet (3) and an exhaust port (4), a sampling tube (5) is inserted into the air inlet (3), and one end of the sampling tube (5) is a sampling head (6), characterized in that: The sampling head (6) is equipped with a gas backflow prevention structure inside, which prevents the extracted gas from flowing back out, thereby ensuring the continuity and accuracy of the detection data. The housing (2) is equipped with a pretreatment structure inside, which is used for gas filtration and dehumidification. The anti-backflow structure includes a flow guide shroud (7) fixed to the inner wall of the sampling head (6), and the flow guide shroud (7) and the sampling head (6) form a flow interception groove (8). The sampling head (6) is provided with a dehumidification unit. The dehumidification unit includes a cavity (9) provided in the inner wall of the flow guide shroud (7). A condenser plate (10) is installed in the cavity (9). A flow guide cone (57) is fixed at one end of the sampling head (6). One end of the flow guide cone (57) is an outer cone opening (58) and the surface of the outer cone opening (58) is provided with spiral patterns (59). The other end of the flow guide cone (57) is an inner cone opening (60) and a flat plate surface (61). The non-dispersive infrared gas analyzer (1) is provided with a collection structure, which includes a flow guide groove (55) provided on the inner wall of the flow guide hood (7), a baffle (12) provided at the end of the flow guide hood (7) with a smaller diameter, a water tank (11) provided inside the housing (2), a groove (56) provided on the sampling head (6), a water guide pipe (13) connected to the sampling head (6) at the groove (56), and the end of the water guide pipe (13) connected to the water tank (11); The pretreatment structure includes a treatment box (17), a perforated plate (18) is fixed at the bottom of the inner cavity of the treatment box (17), a micro motor (19) is installed on the outer wall of the treatment box (17), a movable shaft (20) is rotatably connected inside the treatment box (17), a pressure rod (21) is fixed outside the movable shaft (20), a sliding groove (22) is provided on the inner wall of the treatment box (17), and a groove plate (23) and a pressure plate (24) are slidably connected along the sliding groove (22). The groove plate (23) and the pressure plate (24) are connected by a hollow plate (25), and dry particles (26) are placed inside the hollow plate (25). A baffle plate (27) is magnetically connected to the side of the hollow plate (25) and the top of the treatment box (17). A filter screen (28) is inserted into the groove of the groove plate (23). The side wall of the treatment box (17) is fixed with a spring (29) and a top block (30), and the spring (29) is fixedly connected to the groove plate (23). The filter screen (28) is fixed with an extension plate (31). The top of the hollow plate (25) is fixedly installed with an electric push rod (32), and the output end of the electric push rod (32) passes through the extension plate (31). One side of the treatment box (17) is a water-absorbing sponge (33), and the water-absorbing sponge (33) has irregular holes. The pressure plate (24) is located on one side of the water-absorbing sponge (33), and the pressure plate (24) has a transverse groove (34) to facilitate water flow. The bottom of the treatment box (17) is a water collection tank (35) located on the perforated plate (18).

2. The petrochemical combustion carbon dioxide content detection device according to claim 1, characterized in that: The housing (2) is provided with a cooling structure inside, the cooling structure includes heat dissipation holes (14), the housing (2) is attached with two sets of interconnected hollow tubes (15), and a micro pump (16) is installed on the top of the water tank (11).

3. The petrochemical combustion carbon dioxide content detection device according to claim 1, characterized in that: The housing (2) is equipped with an air pump (36) and a sample chamber (37) for sampling gas. The air pump (36) is connected to the air inlet (3) through a first pipe (38), the air pump (36) is connected to the processing box (17) through a second pipe (39), the processing box (17) is connected to the sample chamber (37) through a third pipe (40), and the sample chamber (37) is connected to the exhaust port (4).

4. The petrochemical combustion carbon dioxide content detection device according to claim 1, characterized in that: The top of the housing (2) is covered by a cover (41) through a disassembly structure. A sealing strip (42) and a vertical plate (43) are fixed at the bottom of the cover (41). The vertical plate (43) has a first insertion port (44) through it. The disassembly structure includes a damping shaft (45) rotatably connected to the inner wall of the housing (2). A disc (46) and a turntable (47) are fixed at both ends of the damping shaft (45). The disc (46) is located inside the housing (2), and the turntable (47) is located outside the housing (2).

5. The petrochemical combustion carbon dioxide content detection device according to claim 4, characterized in that: The disc (46) is provided with an arc groove (48), and a support block (49) is fixed on the inner wall of the housing (2). A plug rod (50) is slidably connected inside the support block (49). A second insertion port (51) is provided on the inner wall of the housing (2). A protrusion (52) is fixed at one end of the plug rod (50), and the protrusion (52) extends into the interior of the arc groove (48).

6. The petrochemical combustion carbon dioxide content detection device according to claim 1, characterized in that: The top of the housing (2) is provided with a sealing groove (53), and the bottom of the inner cavity of the sealing groove (53) is provided with a flexible air cushion (54).

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