Aerosol acidity detection device and method thereof

Abstract

The invention belongs to the field of air detection devices, and provides an aerosol acidity detection device and a method thereof.The aerosol acidity detection device comprises a mounting plate, annular through pipes distributed annularly are arranged on the periphery of the end of the mounting plate, the inner wall of each annular through pipe is coated with coating liquid, the coating liquid adsorbs acid-base gas in air, and the acid-base gas in the air is adsorbed by the coating liquid; a connecting assembly is arranged at the end of the mounting plate and used for fixing the annular through pipe. The gas inlet pipeline is located in front of the annular through pipe, a rotary displacement assembly is arranged at the front ends of the gas inlet pipeline and the annular through pipe, a gas outlet pipeline is arranged at the other end of the annular through pipe, the gas outlet pipeline is movably connected with the annular through pipe, and the other end of the annular through pipe is connected with an ion chromatograph; before the acidity of the aerosol in the atmosphere is calculated, some acidic and alkaline substances in the air are absorbed, and the accuracy of the measurement result of the acidity of the aerosol in the atmosphere is improved.

Description

Technical Field

[0001] The invention belongs to the field of air detection devices, in particular to an aerosol acidity detection device and a method thereof. Background Art

[0002] Aerosol refers to a gaseous dispersion system composed of solid or liquid particles suspended in a gas medium.

[0003] Acidity is one of the most basic chemical property indicators of aerosols. By detecting the acidity of aerosols, we can understand the components, concentrations, phase states and physical and chemical reactions in aerosols, and then understand and evaluate the atmospheric pollution process and its health, environmental and climate effects. This is of great significance for formulating environmental protection policies, controlling pollutant emissions and improving air quality.

[0004] Moreover, acidity is a determining factor in regulating the toxicological effects of aerosols, which has an important impact on human health and may cause respiratory diseases such as asthma and bronchitis. Therefore, by detecting the acidity of aerosols, its potential risks to human health can be assessed, providing a scientific basis for public health decision-making.

[0005] When detecting aerosols in the air, existing devices can only calculate the acidic components of aerosols, but cannot directly measure the acidity of aerosols. In addition, there are acidic and alkaline gases in the atmosphere, some of which (such as sulfur dioxide, hydrogen chloride, etc.) and other alkaline gases may react with certain components in the aerosol to generate new substances, thereby affecting the measurement results of aerosol acidity. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides an aerosol acidity detection device and method thereof to solve the problem in the prior art that when detecting aerosols in the atmospheric environment, acidic and alkaline gases react with aerosol components, affecting the measurement results.

[0007] An aerosol acidity detection device comprises a mounting plate, an annular through tubes are arranged around the end of the mounting plate, a coating liquid is applied on the inner wall of each of the annular through tubes, and the coating liquid adsorbs acid and alkali gases in the air, and a connecting assembly is arranged at the end of the mounting plate, and the connecting assembly is used to fix the annular through tubes;

[0008] It also includes an air intake pipe, the front end of which is connected to a sampling pump, the front end of which is connected to a sampling pump, the air intake pipe is located in front of the annular pipe, the air intake pipe and the front end of the annular pipe are provided with a rotation displacement component, the other end of the annular pipe is provided with an air outlet pipe, the air outlet pipe is movably connected to the annular pipe, and the other end of the annular pipe is connected to an ion chromatograph.

[0009] Preferably, a PM2.5 cutter is installed inside the front end of the air intake pipe, the vertical cross-sectional profile of the mounting plate is cross-shaped, the number of the annular through pipes is greater than two, and the coating liquid is divided into multiple types, including citric acid solution, sodium carbonate solution and sodium fluoride solution.

[0010] Preferably, the connecting assembly includes a plastic clamping ring and a buffer pad, the plastic clamping rings are distributed in a ring shape at the end of the mounting plate, the number of plastic clamping rings on one annular through tube is not less than two, the plastic clamping ring is provided with an opening, the buffer pad is connected to the inner wall of the plastic clamping ring, and the annular through tube enters the plastic clamping ring through the opening and fits with the buffer pad.

[0011] Preferably, a bottom plate is provided below the annular through pipe, and support plate 1 and support plate 2 are provided on the top of the bottom plate. The top of support plate 1 is fixedly connected to the outer wall of the outlet pipe, the top surface of support plate 2 is arc-shaped, and a groove with a vertical cross-sectional profile also being arc-shaped is provided on the arc-shaped surface of support plate 2.

[0012] Preferably, the rotation displacement assembly includes a rotating ring, a mating ring, an air intake plate, a gear ring and a driving gear, the air intake plate is fixedly connected to the inner wall of the rotating ring, the air intake plate is provided with an air intake hole, the mating ring is fixedly connected to the outer wall of the rotating ring, and the mating ring and the slot cooperate with each other, the mating ring can move in the slot, a mating groove is provided inside the rotating ring on one side close to the air intake pipe, and the air intake pipe is movably connected in the mating groove.

[0013] Preferably, the annular through tube is movably connected in the rotating ring, the gear ring is fixedly connected to the outer wall of the rotating ring, a vertical plate is provided on the top of the base plate, a rotating shaft is provided on the vertical plate, the driving gear is connected to the rotating shaft and the driving gear cooperates with the gear ring, a motor with an external power supply is provided on one side of the vertical plate, and the output shaft of the motor is connected to the rotating shaft.

[0014] Preferably, a sealing disc is provided at one end of the annular through pipe close to the air outlet pipe, and the sealing disc is provided with an air outlet hole opposite to the position of the annular through pipe, and a fixedly connected air outlet plate is provided in the air outlet pipe, and the sealing disc is inserted into the air outlet pipe and movably abuts against the air outlet plate, and the air outlet plate is provided with the same air outlet holes.

[0015] Preferably, a temperature and humidity detector is provided on the outer walls of the air outlet pipe and the air inlet pipe, the probe of the temperature and humidity detector extends into the pipe, and a temperature control device with an external power supply is provided on the outer wall of the air outlet pipe and on the side of the temperature and humidity detector away from the ion chromatograph.

[0016] A method for detecting aerosol acidity using any one of claims 1 to 8, comprising the following specific steps:

[0017] S1: Connect the front end of the air inlet pipe to the sampling pump, and the tail end of the air outlet pipe to the ion chromatograph. An annular through-tube is provided between the air inlet pipe and the air outlet pipe. Start the sampling pump, and the sampling pump will pump the gas in the air into the front of the air inlet pipe. There is a PM2.5 cutter at the front end of the air inlet pipe, so that particles with a diameter greater than 2.5 in the air can be blocked. The filtered air will enter the air inlet pipe through the air inlet hole on the air inlet plate and enter from the annular through-tube. There are multiple annular through-tubes, and each annular through-tube has a different coating liquid, including citric acid solution, sodium carbonate solution and sodium fluoride solution.

[0018] The removal of acidic gases, such as sulfur dioxide, can react chemically with the alkaline sodium carbonate solution in the coating solution to generate corresponding salts and water, that is, the acidic gas provides hydrogen ions (H+), and the alkaline solution provides hydroxide ions (OH-), and the two combine to generate water (H2O) and salt;

[0019] Removal of alkaline gases: such as ammonia, etc., can react chemically with the acidic citric acid solution in the coating solution to generate corresponding salts and water, but in the opposite direction, that is, the alkaline gas provides hydroxide ions (OH-), while the acidic solution provides hydrogen ions (H+). The above acid-base neutralization is based on the principle of acid-base neutralization. In addition to chemical reactions, the coating solution can also remove some acid-base gases by physical adsorption. The gas molecules are attracted to the surface of the coating solution and adhere to it;

[0020] S2: Start the motor, which will cooperate with the gear ring through the driving gear, thereby driving the rotating ring to rotate. The air intake plate inside the rotating ring rotates, and the air intake holes will be constantly staggered and overlapped with the annular tubes, so that the gas can enter each annular tube evenly, ensuring the uniformity of the gas flow in each annular tube;

[0021] S3: Finally, the gas will come out from the tail end of the annular pipe and enter the outlet pipe. There is an adsorption layer inside the outlet pipe. When the gas passes through the adsorption layer, large particles of impurities can be adsorbed. At the same time, the dehumidifier is started to adsorb the gas flowing through the outlet pipe, and finally enter the ion chromatograph;

[0022] Ion separation: The ion chromatograph separates the ion components in the gas sample through a specific separation column and eluent system. Different ions have different retention times on the separation column, thus achieving ion separation;

[0023] Ion detection: The separated ions are detected by the detection system. The detector commonly used in ion chromatographs is the conductivity detector, which detects based on the conductivity of the ions. When the ions pass through the detector, an electrical signal is generated, and the intensity of the signal is proportional to the concentration of the ions.

[0024] Data analysis: The detected signals are analyzed and processed by the data processing system to obtain the concentration information of various ions in the gas sample. By comparing the concentrations of different ions and then calculating the acidity through thermodynamic models, the acidity level of the aerosol can be evaluated, thereby detecting the aerosol acidity in the atmospheric composition.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention provides an annular tube, at both ends of which are respectively connected to an air inlet pipe and an air outlet pipe. A sampling pump delivers gas into the annular tube. Different coating liquids are distributed inside the annular tube. Different types of coating liquids can react with acidic and alkaline gases, thereby removing them, thereby preventing the acidic and alkaline gases in the air from reacting with certain components in the aerosol, and improving the detection results of the acidity of the aerosol in the atmosphere. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the components of the overall aerosol device of the present invention;

[0028] Figure 2 This is a schematic diagram of the disassembled structure of the annular through pipe and the rotating ring and other components of the present invention;

[0029] Figure 3 It is a schematic diagram of the structure of the components such as the rotation displacement assembly and the annular through pipe of the present invention;

[0030] Figure 4 This is a cross-sectional view of the internal structure of the rotating ring of the present invention;

[0031] Figure 5 It is a schematic diagram of the structure of the rotating ring and the air intake plate and other components of the present invention;

[0032] Figure 6 This is a schematic diagram of the structure of the support plate 1 and the support plate 2 of the present invention;

[0033] Figure 7 This is a cross-sectional view of the structure of the gas outlet pipe component of the present invention.

[0034] In the figure:

[0035] 1. Mounting plate; 2. Annular pipe; 3. Coating liquid; 4. Inlet pipe; 5. Outlet pipe; 6. Ion chromatograph; 7. Plastic clamp ring; 8. Buffer pad; 9. Opening; 10. Bottom plate; 11. Support plate 1; 12. Support plate 2; 13. Clamping groove; 14. Rotating ring; 15. Matching ring; 16. Inlet plate; 17. Gear ring; 18. Driving gear; 19. Inlet hole; 20. Matching groove; 21. Vertical plate; 22. Rotating shaft; 23. Motor; 24. Sealing disc; 25. Outlet hole; 26. Outlet plate; 27. Temperature and humidity detector; 28. Temperature control device; 29. ​​PM2.5 cutter. DETAILED DESCRIPTION

[0036] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0037] As attached Figure 1 To Attachment Figure 7 As shown:

[0038] Embodiment 1: The present invention provides an aerosol acidity detection device and method, comprising a mounting plate 1, an annular through tube 2 distributed in an annular shape is arranged around the end of the mounting plate 1, a coating liquid 3 is smeared on the inner wall of each annular through tube 2, and the coating liquid 3 adsorbs acid and alkali gases in the air, and a connecting component is provided at the end of the mounting plate 1, and the connecting component is used to fix the annular through tube 2;

[0039] It also includes an air intake pipe 4, the front end of which is connected to a sampling pump. The front end of the air intake pipe 4 is connected to a sampling pump. The air intake pipe 4 is located in front of the annular pipe 2. The air intake pipe 4 and the front end of the annular pipe 2 are provided with a rotation displacement component. The other end of the annular pipe 2 is provided with an air outlet pipe 5, which is movably connected to the annular pipe 2. The other end of the annular pipe 2 is connected to an ion chromatograph 6.

[0040] It should be noted that, through the provision of an annular tube 2, an air inlet pipe 4 and an air outlet pipe 5 are respectively connected at both ends of the annular tube 2, and a sampling pump sends gas into the annular tube 2. Different coating liquids 3 are distributed inside the annular tube 2. Different types of coating liquids 3 can react with acidic and alkaline gases, thereby removing them, avoiding the reaction between acidic and alkaline gases in the air and certain components in the aerosol, and improving the detection results of the acidity of aerosols in the atmosphere.

[0041] In this embodiment, a PM2.5 cutter 29 is installed inside the front end of the air intake pipe 4, the vertical cross-sectional profile of the mounting plate 1 is a cross, the number of annular through pipes 2 is greater than two, and the coating liquid 3 is divided into multiple types, including citric acid solution, sodium carbonate solution and sodium fluoride solution.

[0042] It should be noted that the coating liquid 3 is applied on the inner wall of the annular through pipe 2 , and the acidic and alkaline gases in the air can be absorbed by setting a plurality of coating liquids 3 .

[0043] In this embodiment, the connecting assembly includes a plastic snap ring 7 and a buffer pad 8. The plastic snap ring 7 is distributed in a ring shape at the end of the mounting plate 1. There are no less than two plastic snap rings 7 on an annular through tube 2. An opening 9 is provided on the plastic snap ring 7. The buffer pad 8 is connected to the inner wall of the plastic snap ring 7. The annular through tube 2 enters into the plastic snap ring 7 through the opening 9 and fits with the buffer pad 8.

[0044] It should be noted that the diameter of the opening 9 on the plastic clamping ring 7 is smaller than the diameter of the annular tube 2, so that after the annular tube 2 is inserted into the plastic clamping ring 7, the annular tube 2 can be fixed. The buffer pad 8 can protect the annular tube 2 on the one hand, and can also increase the friction between the annular tube 2 and the annular tube 2, so that the annular tube 2 can rotate together with the plastic clamping ring 7.

[0045] In this embodiment, a bottom plate 10 is provided below the annular through pipe 2, and a support plate 11 and a support plate 2 12 are provided on the top of the bottom plate 10. The top of the support plate 11 is fixedly connected to the outer wall of the outlet pipe 5, and the top surface of the support plate 2 12 is arc-shaped. A slot 13 with an arc-shaped vertical cross-sectional profile is provided on the arc-shaped surface of the support plate 2 12.

[0046] It should be noted that the support plate 1 11 supports the air outlet pipe 5 , and the support plate 2 12 supports the rotating ring 14 . Through the cooperation between the support plate 1 11 and the support plate 2 12 , the annular through pipe 2 can be placed in a horizontal state.

[0047] In this embodiment, the rotation displacement assembly includes a rotating ring 14, a matching ring 15, an air intake plate 16, a gear ring 17 and a driving gear 18. The air intake plate 16 is fixedly connected to the inner wall of the rotating ring 14. The air intake plate 16 is provided with an air intake hole 19. The matching ring 15 is fixedly connected to the outer wall of the rotating ring 14, and the matching ring 15 and the slot 13 cooperate with each other. The matching ring 15 can move in the slot 13. A matching groove 20 is provided inside the rotating ring 14 on one side close to the air intake pipe 4, and the air intake pipe 4 is movably connected in the matching groove 20.

[0048] It should be noted that a positioning pin is provided at a position of the mounting plate 1 close to the rotating ring 14, and the other end of the positioning pin passes through the air inlet plate 16 and is movably connected thereto, so that the rotating ring 14 and the annular through pipe 2 can be movably connected together, and the gas enters the rotating ring 14 from the air inlet pipe 4, and enters the annular through pipe 2 from the air inlet hole 19 on the air inlet plate 16;

[0049] The outer wall of the gear ring 17 is provided with gear teeth evenly distributed, so as to cooperate with the driving gear 18. The driving gear 18 can drive the gear ring 17 to rotate, so as to make the matching ring 15 rotate in the slot 13, thereby driving the air intake plate 16 on the rotating ring 14 to rotate, and the air intake holes 19 on the air intake plate 16 and the annular through pipe 2 will gradually intersect and overlap, so that the gas can evenly enter the annular through pipe 2, ensuring the uniformity of the gas entering each annular through pipe 2;

[0050] At the same time, when the annular tube 2 needs to be replaced, the width of the slot 13 is greater than the width of the matching ring 15, and the rotating ring 14 is moved backward to separate the gear ring 17 from the driving gear 18, so that the rotating ring 14 can be separated from the annular tube 2. When one end of the annular tube 2 is exposed, the annular tube 2 can be pulled out from the opening 9 on the plastic clamp 7, so that when the coating liquid 3 in the annular tube 2 is insufficient, it can be quickly replaced.

[0051] In this embodiment, the annular through pipe 2 is movably connected in the rotating ring 14, the gear ring 17 is fixedly connected to the outer wall of the rotating ring 14, a vertical plate 21 is provided on the top of the base plate 10, a rotating shaft 22 is provided on the vertical plate 21, a driving gear 18 is connected to the rotating shaft 22 and the driving gear 18 and the gear ring 17 cooperate with each other, a motor 23 with an external power supply is provided on one side of the vertical plate 21, and the output shaft of the motor 23 is connected to the rotating shaft 22.

[0052] It should be noted that the motor 23 can drive the driving gear 18 to realize automatic rotation, thereby realizing automatic rotation of the annular through pipe 2.

[0053] In this embodiment, a sealing disc 24 is provided at one end of the annular through pipe 2 close to the air outlet pipe 5, and an air outlet hole 25 is provided on the sealing disc 24 and is opposite to the position of the annular through pipe 2. A fixedly connected air outlet plate 26 is provided in the air outlet pipe 5. The sealing disc 24 is inserted into the air outlet pipe 5 and movably abuts against the air outlet plate 26, and the air outlet plate 26 is provided with the same air outlet hole 25.

[0054] It should be noted that the air outlet on the sealing disc 24 is opposite to the hole of the annular tube 2, and the air inlet on the air inlet plate 16 is also opposite to the hole on the annular tube 2, but the air outlet hole 25 on the air outlet plate 26 and the air outlet hole 25 on the sealing disc 24 are staggered, so that when the gas enters the annular tube 2 from the air inlet hole 19 and flows inside the annular tube 2, the air outlet hole 25 is staggered with the annular tube 2, so that the gas will stay inside the annular tube 2, so that the acid and alkalinity gas can be better processed inside the annular tube 2. When the annular tube 2 rotates to coincide with the air outlet hole 25, the air inlet coincides with the annular tube 2 at the same time, so that new gas can come in, which can not only effectively prevent the situation where too much gas enters and the acid and alkaline substances in the gas are not absorbed completely, thereby improving the degree of absorption of the acid and alkalinity gas in the gas, but also enables the processed gas to stay in the annular tube 2, further improving the processing of the acid and alkaline gas.

[0055] Embodiment 2: The present invention provides an aerosol acidity detection device and method, comprising a mounting plate 1, an annular through pipe 2 distributed in an annular shape is arranged around the end of the mounting plate 1, and a connecting assembly is arranged at the end of the mounting plate 1, and the connecting assembly is used to fix the annular through pipe 2;

[0056] It also includes an air intake pipe 4, the front end of which is connected to a sampling pump. The front end of the air intake pipe 4 is connected to a sampling pump. The air intake pipe 4 is located in front of the annular pipe 2. The air intake pipe 4 and the front end of the annular pipe 2 are provided with a rotation displacement component. The other end of the annular pipe 2 is provided with an air outlet pipe 5, which is movably connected to the annular pipe 2. The other end of the annular pipe 2 is connected to an ion chromatograph 6.

[0057] A temperature and humidity detector 27 is provided on the outer wall of the outlet pipe 5 and the inlet pipe 4. The probe of the temperature and humidity detector 27 extends into the pipe. A temperature control device 28 with an external power supply is provided on the outer wall of the outlet pipe 5 and on the side of the temperature and humidity detector 27 away from the ion chromatograph 6.

[0058] It should be noted that, in this embodiment, the inner wall of the annular through pipe 2 is not coated with the coating liquid 3, the interface between the outlet pipe 5 and the ion chromatograph 6 is opened, a PH test paper is installed in the outlet pipe 5, and a temperature and humidity detector 27 is provided on the outer wall of the outlet pipe 5 and the inlet pipe 4. After the air is filtered by the PM2.5 cutter 29, the temperature and humidity detector 27 will detect the humidity of the air. When the air passes through the annular through pipe 2 and enters the outlet pipe 5, the temperature control device 28 is started at this time, and the temperature control device 28 heats or cools the air in the outlet pipe 5, thereby changing the humidity of the air by adjusting the temperature;

[0059] After the humidity of the air is changed, it is detected again by the temperature and humidity detector 27 to keep the relative humidity of the air at about 90% so that it can fully soak the pH test paper. The pH test paper is used to detect the acidity of the aerosol, so that the acidity of the aerosol can be determined.

[0060] The method of using the above embodiment is to connect the front end of the air inlet pipe 4 to the sampling pump, and the rear end of the air outlet pipe 5 to the ion chromatograph 6. In the initial state, the air inlet hole 19 on the air inlet plate 16 and the hole of the annular tube 2 are staggered, and the annular tube 2 and the air outlet hole 25 on the air outlet plate 26 are overlapped. Start the sampling pump, and the sampling pump will draw the gas in the air into the air inlet pipe 4, but at this time the gas will stay in the rotating ring 14.

[0061] Start the motor 23, the output shaft on the motor 23 is connected to the rotating shaft 22 to drive the driving gear 18 to rotate, the driving gear 18 cooperates with the gear ring 17 to drive the rotating ring 14 to rotate, the air inlet and the annular tube 2 gradually overlap, the gas will enter the annular tube 2 through the air inlet on the air inlet plate 16, the number of the annular tube 2 is multiple, each annular tube 2 has a different coating liquid 3, the coating liquid 3 includes citric acid solution, sodium carbonate solution and sodium fluoride solution, so that the gas can evenly enter each annular tube 2.

[0062] At this time, the outlet holes 25 on the outlet plate 26 gradually intersect with the holes on the annular tube 2, so that the gas will remain in the annular tube 2 for a period of time, thereby increasing the reaction time between the coating liquid 3 and the acid-base gas to ensure complete reaction. When the air inlet holes 19 intersect with the annular tube 2 again, the outlet holes 25 on the outlet plate 26 will gradually overlap with the outlet holes 25 on the sealing disc 24, so that the treated gas enters the outlet pipe 5;

[0063] Finally, the gas will enter the ion chromatograph 6, which processes the incoming gas, including ion separation and ion detection box data analysis, and finally calculates the acidity through a thermodynamic model, thereby detecting the aerosol acidity in the atmospheric components.

[0064] After the treatment is completed, the motor 23 stops rotating, the sampling pump stops, the matching ring 15 on the rotating ring 14 is movably set in the slot 13, the width of the slot 13 is greater than the width of the matching ring 15, and the rotating ring 14 is moved backward to move the rotating ring 14 on the recent pipeline, the gear ring 17 and the driving gear 18 are gradually separated, and the rotating ring 14 will also be gradually separated from the annular tube 2. When one end of the annular tube 2 is exposed, the annular tube 2 can be pulled out from the opening 9 on the plastic clamp 7. On the one hand, the products after the coating liquid 3 and the pH gas treatment can be collected, and the new coating liquid 3 can also be re-applied, which is quick and convenient, thereby realizing the removal of the pH gas in the air and avoiding reaction with certain components in the aerosol, thereby increasing the detection result of the aerosol acidity.

[0065] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An aerosol acidity detection device, characterized in that: include: A mounting plate (1), wherein an annular through pipes (2) are arranged in an annular shape around the end of the mounting plate (1), a coating liquid (3) is applied to the inner wall of each of the annular through pipes (2), and the coating liquid (3) adsorbs acid and alkali gases in the air, and a connecting component is provided at the end of the mounting plate (1), and the connecting component is used to fix the annular through pipes (2); It also comprises an air intake pipe (4), the front end of which is connected to a sampling pump, the air intake pipe (4) is located in front of the annular tube (2), the air intake pipe (4) and the front end of which are provided with a rotation displacement assembly, the other end of which is provided with an air outlet pipe (5), the air outlet pipe (5) is movably connected to the annular tube (2), and the other end of which is connected to an ion chromatograph (6).

2. The aerosol acidity detection device according to claim 1, characterized in that: A PM2.5 cutter (29) is installed inside the front end of the air intake pipe (4), the vertical cross-sectional profile of the mounting plate (1) is cross-shaped, the number of the annular through pipes (2) is greater than two, and the coating liquid (3) is divided into multiple types, including citric acid solution, sodium carbonate solution and sodium fluoride solution.

3. The aerosol acidity detection device according to claim 2, characterized in that: The connection assembly comprises a plastic snap ring (7) and a buffer pad (8), wherein the plastic snap ring (7) is distributed in an annular shape at the end of the mounting plate (1), and the number of plastic snap rings (7) on one annular through tube (2) is not less than two, and the plastic snap ring (7) is provided with an opening (9), and the buffer pad (8) is connected to the inner wall of the plastic snap ring (7), and the annular through tube (2) enters into the plastic snap ring (7) through the opening (9) and fits with the buffer pad (8).

4. The aerosol acidity detection device according to claim 1, characterized in that: A bottom plate (10) is provided below the annular through pipe (2), and a support plate 1 (11) and a support plate 2 (12) are provided on the top of the bottom plate (10). The top of the support plate 1 (11) is fixedly connected to the outer wall of the outlet pipe (5), and the top surface of the support plate 2 (12) is arc-shaped. A slot (13) having a vertical cross-sectional profile that is also arc-shaped is provided on the arc-shaped surface of the support plate 2 (12).

5. The aerosol acidity detection device according to claim 4, characterized in that: The rotation displacement assembly comprises a rotating ring (14), a matching ring (15), an air intake plate (16), a gear ring (17) and a driving gear (18); the air intake plate (16) is fixedly connected to the inner wall of the rotating ring (14); the air intake plate (16) is provided with an air intake hole (19); the matching ring (15) is fixedly connected to the outer wall of the rotating ring (14); the matching ring (15) and the clamping groove (13) are matched with each other; the matching ring (15) can move in the clamping groove (13); a matching groove (20) is provided inside the rotating ring (14) on a side close to the air intake pipe (4); the air intake pipe (4) is movably connected in the matching groove (20).

6. The aerosol acidity detection device according to claim 5, characterized in that: The annular through pipe (2) is movably connected in the rotating ring (14); the gear ring (17) is fixedly connected to the outer wall of the rotating ring (14); a vertical plate (21) is provided on the top of the bottom plate (10); a rotating shaft (22) is provided on the vertical plate (21); the driving gear (18) is connected to the rotating shaft (22) and the driving gear (18) and the gear ring (17) cooperate with each other; a motor (23) connected to an external power source is provided on one side of the vertical plate (21); an output shaft of the motor (23) is connected to the rotating shaft (22).

7. The aerosol acidity detection device according to claim 1, characterized in that: A sealing disc (24) is provided at one end of the annular through pipe (2) close to the air outlet pipe (5); an air outlet hole (25) is provided on the sealing disc (24) and is located opposite to the annular through pipe (2); a fixedly connected air outlet plate (26) is provided in the air outlet pipe (5); the sealing disc (24) is inserted into the air outlet pipe (5) and movably abuts against the air outlet plate (26); and the air outlet plate (26) is provided with the same air outlet hole (25).

8. The aerosol acidity detection device according to claim 7, characterized in that: A temperature and humidity detector (27) is provided on the outer walls of the air outlet pipe (5) and the air inlet pipe (4), and a probe of the temperature and humidity detector (27) extends into the pipe. A temperature control device (28) with an external power supply is provided on the outer wall of the air outlet pipe (5) and on a side of the temperature and humidity detector (27) away from the ion chromatograph (6).

9. A method for detecting aerosol acidity according to any one of claims 1 to 8, comprising the following specific steps: S1: The front end of the air inlet pipe (4) is connected to the sampling pump, and the rear end of the air outlet pipe (5) is connected to the ion chromatograph (6). An annular tube (2) is provided between the air inlet pipe (4) and the air outlet pipe (5). The sampling pump is started, and the sampling pump pumps the gas in the air into the front of the air inlet pipe (4). The front end of the air inlet pipe (4) is provided with a PM2.5 cutter (29), so that particles with a diameter greater than 2.5 in the air can be blocked. The filtered air enters the air inlet pipe (4) through the air inlet hole (19) on the air inlet plate (16) and enters from the annular tube (2). There are multiple annular tubes (2), and each annular tube (2) has a different coating liquid (3). The coating liquid (3) includes a citric acid solution, a sodium carbonate solution and a sodium fluoride solution. The removal of acidic gases, such as sulfur dioxide, can react chemically with the alkaline sodium carbonate solution in the coating solution to generate corresponding salts and water, that is, the acidic gas provides hydrogen ions (H+), and the alkaline solution provides hydroxide ions (OH-), and the two combine to generate water (H2O) and salt; Removal of alkaline gases: such as ammonia, etc., can react chemically with the acidic citric acid solution in the coating solution to generate corresponding salts and water, but in the opposite direction, that is, the alkaline gas provides hydroxide ions (OH-), while the acidic solution provides hydrogen ions (H+). The above acid-base neutralization is based on the principle of acid-base neutralization. In addition to chemical reactions, the coating solution can also remove some acid-base gases by physical adsorption. The gas molecules are attracted to the surface of the coating solution and adhere to it; S2: In the initial state, the air inlet holes (19) on the air inlet plate (16) and the holes of the annular tube (2) are staggered, and the annular tube (2) and the air outlet holes (25) on the air outlet plate (26) are overlapped. The sampling pump will pump the gas in the air into the air inlet pipe (4), but at this time the gas will stay in the rotating ring (14); The motor (23) is started, and the output shaft on the motor (23) is connected to the rotating shaft (22) to drive the driving gear (18) to rotate. The driving gear (18) and the gear ring (17) cooperate with each other to drive the rotating ring (14) to rotate. The air inlet and the annular tube (2) gradually overlap, and the gas enters the annular tube (2) through the air inlet on the air inlet plate (16). The number of the annular tubes (2) is multiple, which ensures that the gas entering each annular tube (2) has the same volume, thereby improving the uniformity of the gas entering each annular tube (2); At this time, the outlet holes (25) on the outlet plate (26) gradually intersect with the holes on the annular tube (2), so that the gas will remain in the annular tube (2) for a period of time, thereby increasing the reaction time between the coating liquid (3) and the acid-base gas, ensuring that the reaction is complete. When the air inlet hole (19) intersects with the annular tube (2) again, the outlet holes (25) on the outlet plate (26) gradually overlap with the outlet holes (25) on the sealing disc (24), so that the gas after treatment is discharged from the outlet hole (25) on the sealing disc (24); S3: The gas will eventually come out from the tail end of the annular tube (2) and enter the gas outlet pipe (5). The gas outlet pipe (5) has an adsorption layer (27) inside. When the gas passes through the adsorption layer (27), large particles of impurities can be adsorbed. At the same time, the dehumidifier (28) is started to adsorb the gas flowing through the gas outlet pipe (5), and finally enter the ion chromatograph (6); Ion separation: The ion chromatograph (6) separates the ion components in the gas sample through a specific separation column and eluent system. Different ions have different retention times on the separation column, thus achieving ion separation; Ion detection: The separated ions are detected by a detection system. The detector commonly used in ion chromatographs (6) is a conductivity detector, which detects based on the conductivity of ions. When ions pass through the detector, an electrical signal is generated, and the intensity of the signal is proportional to the concentration of the ions. Data analysis: The detected signals are analyzed and processed by the data processing system to obtain the concentration information of various ions in the gas sample. By comparing the concentrations of different ions and then calculating the acidity through thermodynamic models, the acidity level of the aerosol can be evaluated, thereby detecting the aerosol acidity in the atmospheric composition.

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