Test device and test method for aerosol behavior mechanism research

Abstract

The invention discloses a test device and a test method for aerosol behavior mechanism research, a test tube can adjust the internal temperature to a preset value and keep stable, and an air supply system can adjust the air temperature to a preset value and convey the air to an aerosol distribution system. Aerosol generated by the aerosol distribution system is conveyed to the aerosol buffer system, the vacuumizing system is used for vacuumizing the aerosol buffer system, and aerosol with preset quantity concentration at preset temperature can be prepared in the aerosol buffer system and conveyed into the test tube; the water vapor generating system can generate water vapor at a preset temperature and convey the water vapor into the test tube, so that the test tube reaches a preset relative humidity, and the aerosol sampling system is used for sampling aerosol in the test tube and conveying the aerosol to the aerosol measuring system for parameter measurement; therefore, the test device can be used for researching the behavior mechanism of aerosols with different quantities and concentrations under the conditions of different environment temperatures and relative humidity.

Description

Technical Field

[0001] The present invention relates to the technical field of aerosol research, and in particular to an experimental device and an experimental method for studying the behavior mechanism of aerosol. Background Art

[0002] After an accident in a nuclear power plant, the radioactive fission products in the core will be released into the containment in the form of gas, water vapor and aerosol. Aerosols are the main carriers of radioactive fission products and are also an important source of radioactive fission products in the containment to the surrounding atmosphere after the accident. The behavior of aerosols in the containment mainly includes natural sedimentation, thermophoretic deposition, diffusivitation deposition, hygroscopic growth, Brownian coagulation, gravity coagulation, etc. It is of great significance to study the behavior mechanism of aerosols in the containment after a nuclear power plant accident.

[0003] Prior art CN114993893A discloses an experimental device for studying aerosol behavior in a containment, including a containment simulation body, an aerosol injection system, a steam injection system, a spray system, a deionized water injection system, a condensate collection system, a wall temperature control system, a vacuum system, an aerosol sampling and measurement system, and a control and auxiliary system. By accurately controlling the temperature, humidity, pressure, thermal environmental parameters, and the concentration and size of the injected aerosol particles in the containment simulation body, the expected controllable experimental boundary conditions under various working conditions can be obtained.

[0004] Prior art CN211654328U discloses a test system for measuring aerosol concentration and behavior under test conditions, including a test container, and an aerosol generating system, a water temperature control system, a steam generating system, an aerosol measuring system and a hydrogen combustion system connected to the test container at the same time, wherein the test container is a cylindrical structure with a sandwich layer on the side wall, and the temperature inside the test container is controlled by the water temperature control system; the aerosol generating system can generate aerosol and transport it to the test container; the steam generating system can provide saturated steam with a fixed temperature for the test container; the hydrogen combustion system generates the required expansion airflow for the test container by controlling the hydrogen combustion.

[0005] None of the above technical solutions involve the study of the behavior mechanism of aerosols of different types, particle sizes and number concentrations under different ambient temperature and relative humidity conditions, nor do they achieve timed, quantitative, automatic and rapid sampling of aerosols.

[0006] In view of the above technical problems, the present invention is specially introduced. Summary of the invention

[0007] The main purpose of the present invention is to provide an experimental device and an experimental method for studying the behavior mechanism of aerosols, which are used to study the behavior mechanism of aerosols of different types, particle sizes and number concentrations under different ambient temperature and relative humidity conditions.

[0008] To achieve the above object, according to one aspect of the present invention, an experimental device for studying the behavior mechanism of aerosols is provided, comprising a test tube connected by a connecting pipeline, an air supply system, an aerosol distribution system, an aerosol buffer system, a vacuum system, a water vapor generation system, an aerosol sampling system and an aerosol measurement system;

[0009] The test tube can adjust its internal temperature to a preset value and keep the internal temperature stable, the air supply system can adjust the air temperature to a preset value and deliver the air to the aerosol distribution system, deliver the aerosol generated by the aerosol distribution system to the aerosol buffer system, the vacuum system is used to vacuum the aerosol buffer system, and the aerosol with a preset quantity concentration at a preset temperature can be prepared in the aerosol buffer system and delivered to the test tube;

[0010] The water vapor generation system can generate water vapor at a preset temperature and transport it into the test tube so that the preset relative humidity is reached in the test tube. The aerosol sampling system is used to sample the aerosol in the test tube and transport it to the aerosol measurement system for parameter measurement, so that the test device can study the behavior mechanism of aerosols of different quantity concentrations under different ambient temperature and relative humidity conditions.

[0011] Furthermore, the test device also includes a flow regulation system and an aerosol dilution system. The air supply system is connected to the aerosol dilution system through the flow regulation system. The aerosol dilution system is connected between the aerosol sampling system and the aerosol measurement system. In the aerosol dilution system, the sampled aerosol is diluted with air at a preset dilution ratio.

[0012] Furthermore, the air supply system is also connected to the water vapor generation system through a flow regulating system, so that air with a preset relative humidity can be prepared in the water vapor generation system and delivered to the test tube.

[0013] Furthermore, the flow regulation system includes a main line and multiple branch lines with different diameters, one end of each branch line is connected to the main line, and the other end is connected to the atmosphere, and each branch line is provided with a regulating valve with adjustable opening.

[0014] Furthermore, the test tube is provided with a plurality of aerosol injection ports, a plurality of aerosol sampling ports and more than two water vapor injection ports along the axial direction, which are respectively connected with a plurality of aerosol injection branches, a plurality of aerosol sampling branches and more than two water vapor injection branches.

[0015] Furthermore, the aerosol sampling system includes multiple aerosol sampling boxes, each aerosol sampling branch includes an aerosol sampling box and a sampling valve, each aerosol sampling branch is connected to the aerosol dilution system through a delivery valve, and a piston that can move with a fixed stroke is provided in the aerosol sampling box.

[0016] Furthermore, the aerosol dilution system includes an aerosol dilution container, which includes a plurality of compartments of the same volume, each compartment is respectively connected to each aerosol sampling branch, and the flow regulation system is connected to each compartment via a dilution valve.

[0017] Furthermore, each aerosol sampling box is connected to the inside of the test tube through an aerosol sampling pipeline. The part of the aerosol sampling pipeline located in the test tube includes a sleeve assembly, which can be extended and retracted to different lengths along the axial direction of the test tube to achieve sampling in different radial directions of the test tube.

[0018] Furthermore, the aerosol distribution system includes multiple aerosol distribution subsystems, the aerosol buffer system includes multiple aerosol buffer tanks, each of the multiple aerosol injection branches includes an aerosol distribution subsystem, an aerosol buffer tank, an aerosol distribution valve, a buffer valve and an aerosol injection valve, and each aerosol buffer tank is connected to the vacuum system through a vacuum valve.

[0019] Furthermore, the water vapor generating system includes more than two water vapor generating devices, each water vapor injection branch includes a water vapor generating device, a water vapor delivery valve and a water vapor injection valve, the water vapor generating device includes an ultrasonic atomizer and a multi-layer electric heating wire, the multi-layer spirally designed electric heating wire is arranged above the ultrasonic atomizer, and both ends of each layer of electric heating wire are connected to the inner wall of the water vapor generating device through bearings.

[0020] Furthermore, the water vapor generating device is connected to the interior of the test tube through a water vapor injection pipeline, the outer wall of the water vapor injection pipeline is provided with a heat-insulating material, and the outlet of the water vapor injection pipeline is provided with a steam nozzle that can be freely extended and rotated.

[0021] Furthermore, a purge port and an exhaust port are provided on the test tube. The purge port is connected to the air supply system through a purge valve. The purge port is provided with a diffusion nozzle. Both ends of the outlet of the diffusion nozzle are connected to a shaft that can move axially along the test tube, which is used for all-round aerosol purging inside the test tube.

[0022] Furthermore, a metal oxide antistatic film with a thickness ranging from 0.03 to 0.08 mm is provided on the inner wall surface of the test tube.

[0023] Furthermore, a heating belt and thermal insulation cotton are arranged on the outer wall of the test tube. The heating belt is arranged in a spiral around the outer wall of the test tube, and the material of the thermal insulation cotton includes silicate.

[0024] Furthermore, an air supply valve and a pressure reducing valve are provided at the outlet of the air supply system. The air supply system includes an air compressor, an air buffer tank, an air heater, an air dryer and an air high efficiency filter. The air high efficiency filter is used to filter particulate dust and suspended matter with a particle size of more than 0.5 μm.

[0025] In order to achieve the above object, according to another aspect of the present invention, an experimental method for studying the behavior mechanism of aerosols is proposed, which uses an experimental device for studying the behavior mechanism of aerosols and includes the following steps:

[0026] The test preparation steps include using a vacuum system to evacuate the inside of the aerosol buffer system and the test tube to a vacuum state, injecting air into the test tube through an air supply system, and adjusting the temperature in the test tube to stabilize at a preset temperature and the air pressure in the test tube to stabilize at standard atmospheric pressure;

[0027] A water vapor injection step, starting the water vapor generation system, and injecting the generated water vapor into the test tube after the water vapor reaches a preset temperature, so that the relative humidity in the test tube reaches a preset relative humidity and is stable;

[0028] The aerosol preparation and injection step includes starting the air supply system and the aerosol distribution system, injecting aerosol into the aerosol buffer system, so that the aerosol in the aerosol buffer system reaches a preset quantity concentration and a preset temperature and remains stable, and the aerosol buffer system injects aerosol into various positions in the test tube, so that the aerosol in various positions in the test tube reaches a preset quantity concentration and remains stable;

[0029] The sampling and measurement steps include starting the aerosol sampling system, collecting multiple samples at different positions in the test tube and transporting them to the aerosol measurement system. The aerosol measurement system measures the parameters of the particle size distribution, mass concentration and number concentration of the sample aerosol.

[0030] Furthermore, in the sampling and measuring step, the flow regulation system is turned on and the air flow at the outlet of the flow regulation system is adjusted to reach a preset value and remain stable. The sample collected by the aerosol sampling system is first input into the aerosol dilution system, so that the sample and air are diluted at a preset dilution ratio and then transported to the aerosol measurement system.

[0031] Furthermore, in the water vapor injection step, after the water vapor generating system is turned on, the flow regulating system is turned on and the air flow at the outlet of the flow regulating system is adjusted to reach a preset value and remain stable, and air is injected into the water vapor generating system so that the preset relative humidity in the water vapor generating system is reached and remains stable, and then injected into the test tube.

[0032] Furthermore, the test method also includes a purging recovery step, which is located after the sampling and measuring step, and is for purging the aerosol in the aerosol dilution system so that the mass concentration and number concentration of the aerosol in the aerosol dilution system reach the background and are stable, and is for reducing the temperature of the air supplied by the air supply system to room temperature and keeping it stable, and is for purging the inside of the test tube so that the mass concentration and number concentration of the aerosol in the test tube reach the background and are stable, and is for returning the test device to an initial state.

[0033] Furthermore, in the purge recovery step, after the aerosol mass concentration and number concentration in the aerosol dilution system reach the background and stabilize, the sampling and measurement steps can be repeated multiple times to perform multiple sets of aerosol parameter measurements.

[0034] By applying the above technical solution of the present invention, at least the following beneficial effects are achieved:

[0035] 1. The test device of the present invention ensures that the aerosol always reacts with the water vapor at the same ambient temperature by designing a test tube with a temperature regulating function, an air supply system and a water vapor generating system. The aerosol buffer system can be configured with a certain concentration of aerosol. Combined with the test method proposed in the present invention, it is possible to more accurately conduct test studies on aerosols of different types, particle sizes and number concentrations under different ambient temperatures and relative humidity conditions.

[0036] 2. The test device of the present invention can realize dynamic dilution of aerosol samples and air at a fixed dilution ratio by setting a flow regulating system and an aerosol dilution system, thereby improving the accuracy and continuity of test data obtained by the test device.

[0037] 3. The test device of the present invention can realize the injection of aerosol and water vapor into multiple positions inside the test tube by designing multiple sol injection ports, aerosol sampling ports, water vapor injection ports and corresponding multiple branches on the test tube, so that the distribution of aerosol and water vapor inside the test tube is more uniform, thereby improving the accuracy of data obtained by the test device.

[0038] 4. The aerosol sampling box designed for the test device of the present invention can realize the timed, quantitative and automatic sampling of aerosols, especially the sampling speed is fast to prevent the aerosol from condensing, and can also realize sampling at different radial positions of the test tube, which can improve the data accuracy and operability of the test device and reduce the number of operators and costs.

[0039] 5. The test device of the present invention can realize all-round purge of the inside of the test tube by designing the purge port, so that the aerosol in the test tube is more easily discharged, thereby improving the post-processing efficiency of the test device. The air supply system is provided with a variety of equipment such as high-efficiency filters, which can provide cleaner and drier air.

[0040] 6. The test device of the present invention eliminates the influence of electrostatic adsorption effect on the aerosol wall deposition behavior by designing an antistatic film on the inner wall of the test tube, further improving the accuracy and authenticity of the test data obtained by the test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0042] Figure 1 A schematic diagram of an aerosol behavior mechanism research test device according to an embodiment is shown;

[0043] Figure 2 A schematic structural diagram of a flow regulation system according to an embodiment is shown.

[0044] The above drawings include the following reference numerals:

[0045] 1. Test tube; 2. Air supply system; 3. Air supply valve; 4. Pressure reducing valve; 6. Aerosol distribution system; 8. Aerosol buffer system; 10. Purge valve; 13. Water vapor generation system; 14. Aerosol sampling system; 17. Tube discharge valve; 18. Flow control system; 19. Dilution valve; 20. Aerosol dilution system; 21. Aerosol measurement system; 22. Dilution discharge valve; 23. Vacuum system; 25. Main pipeline; 26. Branch pipeline;

[0046] 5a / 5b / 5c / 5d, aerosol distribution valve; 7a / 7b / 7c / 7d, buffer valve; 8a / 8b / 8c / 8d, aerosol buffer tank; 9a / 9b / 9c / 9d, aerosol injection valve; 11a / 11b / 11c / 11d, vacuum valve; 12a / 12b / 12c, sampling valve; 13a / 13b, water vapor generating device; 14a / 14b / 14c, aerosol sampling box; 15a / 15b, water vapor delivery valve; 16a / 16b / 16c, delivery valve; 24a / 24b, water vapor injection valve. DETAILED DESCRIPTION

[0047] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0048] The present invention is further described in detail below in conjunction with specific embodiments, and these embodiments cannot be understood as limiting the scope of protection claimed by the present invention. The term "including" when used indicates the existence of a feature, but does not exclude the existence or addition of one or more other features; the orientation or position relationship indicated by the terms "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0049] In the description, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0050] Example:

[0051] The present invention proposes an experimental device for studying the behavior mechanism of aerosols, such as Figure 1 As shown, it includes a test tube 1 connected by connecting pipelines, an air supply system 2, an aerosol distribution system 6, an aerosol buffer system 8, a vacuum system 23, a water vapor generation system 13, an aerosol sampling system 14 and an aerosol measurement system 21.

[0052] Specifically, the test tube 1 can adjust its internal temperature to a preset value and keep the internal temperature stable. Preferably, a heating belt and thermal insulation cotton are arranged on the outer wall of the test tube 1, the heating belt is spirally arranged around the outer wall of the test tube 1, the material of the thermal insulation cotton includes silicate, and the test tube is provided with measuring instruments such as a pressure sensor, a thermometer, a relative humidity meter and an aerosol concentration meter.

[0053] The inner wall surface of the test tube 1 is provided with a metal oxide antistatic film with a thickness ranging from 0.03 to 0.08 mm to eliminate the influence of the electrostatic adsorption effect on the aerosol wall deposition behavior, further improving the accuracy and authenticity of the test data obtained by this test device. The metal oxide antistatic film fills some metal oxide materials into a plastic matrix such as PVC or PE. Further preferably, the metal oxide used in the metal oxide antistatic film may include titanium oxide, zinc oxide, tin oxide, indium oxide and aluminum oxide, etc., and the thickness is selected to be 0.05 mm. Its advantages are good wear resistance and toughness, shortening the replacement cycle, extending the life of the device, and enhancing the operational reliability of the device.

[0054] The test tube 1 of the present invention is relatively long in the axial direction, and is provided with a plurality of aerosol injection ports, a plurality of aerosol sampling ports, and two or more water vapor injection ports at intervals in the axial direction, which are respectively connected to a plurality of aerosol injection branches, a plurality of aerosol sampling branches, and two or more water vapor injection branches. The test tube 1 is also provided with a purge port and a discharge port. Preferably, as Figure 1 As shown, the test tube 1 is provided with 4 aerosol injection ports, 3 aerosol sampling ports and 2 water vapor injection ports, as well as a purge port and a discharge port, and the discharge port is connected to the atmosphere by a pipe discharge valve 17. This design can realize the injection of aerosol and water vapor into multiple positions inside the test tube, so that the aerosol and water vapor inside the test tube are more evenly distributed, thereby improving the accuracy of the data obtained by the test device.

[0055] The air supply system 2 can adjust the air temperature to a preset value and deliver the air to the aerosol distribution system 6, so as to deliver the aerosol generated by the aerosol distribution system 6 to the aerosol buffer system 8. Preferably, an air supply valve 3 and a pressure reducing valve 4 are provided at the outlet of the air supply system 2, so as to be able to close the air supply system and adjust the air pressure of the supplied air. In some other embodiments, other devices can also be used to adjust the air pressure of the air.

[0056] Preferably, the air supply system 2 includes an air compressor, an air buffer tank, an air heater, an air dryer and an air high efficiency filter, and the air high efficiency filter is used to filter particulate dust and suspended matter with a particle size of 0.5 μm or more. Further preferably, the filter material of the air high efficiency filter is a mesh ultra-fine glass fiber, and the sealing material is a new type of polyurethane, so that the air supply system 2 can provide cleaner and drier air to avoid affecting the experimental results.

[0057] The vacuuming system 23 is used to vacuum the aerosol buffer system 8 , so that an aerosol with a preset quantity concentration at a preset temperature can be prepared in the aerosol buffer system 8 and transported to the test tube 1 .

[0058] In addition, the water vapor generation system 13 can generate water vapor of a preset temperature and transport it into the test tube 1, so that the test tube 1 reaches a preset relative humidity. The aerosol sampling system 14 is used to sample the aerosol in the test tube 1 and transport it to the aerosol measurement system 21 for parameter measurement.

[0059] The test device of the present invention ensures that the aerosol always reacts with the water vapor at the same ambient temperature by designing a test tube with a temperature regulating function, an air supply system and a water vapor generating system. The aerosol buffer system can be configured with a certain concentration of aerosol. Combined with the test method proposed in the present invention, it is possible to more accurately conduct test studies on aerosols of different types, particle sizes and number concentrations under different ambient temperatures and relative humidity conditions.

[0060] The test device also includes a flow regulating system 18 and an aerosol dilution system 20, and the air supply system 2 is connected to the aerosol dilution system 20 through the flow regulating system 18. The aerosol dilution system 20 is connected between the aerosol sampling system 14 and the aerosol measuring system 21, and the sampled aerosol and air are diluted at a preset dilution ratio in the aerosol dilution system 20. A dilution valve 19 is provided between the aerosol dilution system 20 and the flow regulating system 18 for control. The present invention realizes the dynamic dilution of the aerosol sample and the air at a fixed dilution ratio, which can improve the accuracy and continuity of the test data obtained by the test device.

[0061] The air supply system 2 is also connected to the water vapor generation system 13 through the flow regulating system 18, so that air with a preset relative humidity can be prepared in the water vapor generation system 13 and delivered to the test tube 1. In some other embodiments, the air supply system 2 may also be provided with multiple air supply systems, which are used for purging, diluting and preparing air with a preset relative humidity, etc. In some other embodiments, water vapor may be directly delivered to the test tube 1 without being prepared in the water vapor generation system 13.

[0062] like Figure 2 As shown, the structure of the preferred flow regulating system 18 includes a main line 25 and a plurality of branch lines 26 of different diameters, one end of each of the branch lines 26 is connected to the main line 25, and the other end is connected to the atmosphere, and a regulating valve with an adjustable opening is provided on each branch line 26. The air flow of the main line 25 can be adjusted by adjusting the opening of the electric regulating valve of each branch line which is adjustable from 0% to 100%.

[0063] Preferably, the purge port is connected to the air supply system 2 through a purge valve 10, and a diffusion nozzle is provided at the purge port, and both ends of the outlet of the diffusion nozzle are connected to a shaft that can move along the axial direction of the test tube 1, so that the air flow area of ​​the diffusion nozzle outlet can be freely changed. It is used for omnidirectional aerosol purge inside the test tube 1, so that the aerosol in the test tube is easier to be discharged, which improves the post-processing efficiency of the test device, and is used to restore the test tube 1 to its initial state after the test is completed.

[0064] In the present invention, the aerosol sampling system 14 includes a plurality of aerosol sampling boxes, and each aerosol sampling branch is respectively provided with an aerosol sampling box, a sampling valve and a delivery valve. Preferably, three aerosol sampling branches are provided corresponding to the three aerosol sampling ports, and the three aerosol sampling branches include three aerosol sampling boxes 14a, 14b and 14c, and the three aerosol sampling boxes 14a, 14b and 14c are connected to three sampling valves 12a, 12b and 12c respectively. The sampling valve is arranged between the aerosol sampling box and the test tube. The three aerosol sampling branches are connected to the aerosol dilution system 20 through three delivery valves 16a, 16b and 16c respectively. The aerosol dilution system 20 is also connected to the atmosphere through a dilution discharge valve 22.

[0065] Specifically, a piston that can move with a fixed stroke is provided in the aerosol sampling boxes 14a, 14b, and 14c. Preferably, the aerosol sampling box has a volume of 200 mL, and a rectangular stainless steel piston that can move up and down with a fixed stroke is provided inside, which can achieve rapid changes in volume within the range of 0-200 mL to complete rapid sampling of aerosol samples. The aerosol sampling system 14 of the present invention can achieve timed, quantitative, and automated sampling of aerosols, especially with a faster sampling speed to prevent aerosols from condensing.

[0066] Preferably, the three aerosol sampling boxes 14a, 14b, and 14c are all connected to the inside of the test tube 1 through an aerosol sampling pipeline, and the part of the aerosol sampling pipeline located in the test tube 1 includes a sleeve assembly. The sleeve assembly can be extended and retracted to different lengths along the axial direction of the test tube 1 to achieve sampling in different radial directions of the test tube 1, which can improve the data accuracy of the test device.

[0067] The aerosol dilution system 20 includes an aerosol dilution container, which includes a plurality of compartments of the same volume, each compartment being connected to each aerosol sampling branch, and the flow regulating system 18 being connected to each compartment via a dilution valve 19. Preferably, the aerosol dilution container is divided into three compartments of the same volume, and the three compartments are connected to three delivery valves 16a, 16b, and 16c, respectively. The three compartments are connected to the main line 25 of the flow regulating system 18, respectively.

[0068] The aerosol distribution system 6 includes a plurality of aerosol distribution subsystems, and the aerosol buffer system 8 includes a plurality of aerosol buffer tanks. Each aerosol injection branch includes an aerosol distribution subsystem, an aerosol buffer tank, an aerosol distribution valve, a buffer valve, and an aerosol injection valve. Preferably, four aerosol injection branches are provided corresponding to the four aerosol injection ports, and the four aerosol injection branches include four aerosol distribution subsystems 6a, 6b, 6c, 6d and four aerosol buffer tanks 8a, 8b, 8c, 8d. The four aerosol distribution subsystems 6a, 6b, 6c, 6d are connected to the air supply system 2 through four aerosol distribution valves 5a, 5b, 5c, 5d. Four buffer valves 7a, 7b, 7c, 7d are provided between the four aerosol distribution subsystems 6a, 6b, 6c, 6d and the four aerosol buffer tanks 8a, 8b, 8c, 8d. The four aerosol buffer tanks 8a, 8b, 8c, 8d are connected to the test tube 1 through four aerosol injection valves 9a, 9b, 9c, 9d respectively. The outer wall of the aerosol buffer tanks 8a, 8b, 8c, 8d is provided with a heating belt, and a thermometer, an aerosol concentration meter and a pressure sensor are provided inside.

[0069] In addition, the four aerosol buffer tanks 8a, 8b, 8c, and 8d are connected to the vacuum system 23 via four vacuum valves 11a, 11b, 11c, and 11d respectively, so as to control the vacuuming of the aerosol buffer tanks.

[0070] The water vapor generation system 13 includes more than two water vapor generation devices, and each water vapor injection branch includes a water vapor generation device, a water vapor delivery valve, and a water vapor injection valve. Preferably, two water vapor injection ports are provided with two water vapor injection branches, and the two water vapor injection branches include two water vapor generation devices 13a, 13b, two water vapor delivery valves 15a, 15b, and two water vapor injection valves 24a, 24b.

[0071] The outlet of the water vapor generating device is connected to the inside of the test tube 1 through the water vapor injection pipeline. The water vapor generating device is connected to the outlet of the flow regulating system 18 through the water vapor injection valve. Preferably, the outer wall surface of the water vapor injection pipeline is provided with a heat-insulating material to prevent the temperature of the water vapor from changing during the injection process, and a heat-insulating cotton made of silicate can be preferably used. The outlet of the water vapor injection pipeline is provided with a steam nozzle that can be freely extended and rotated so that the water vapor can be evenly injected into the test tube.

[0072] Preferably, the water vapor generating device comprises an ultrasonic atomizer and a multi-layer electric heating wire, wherein the multi-layer spiral electric heating wire is arranged above the ultrasonic atomizer. Both ends of each layer of electric heating wire are connected to the inner wall of the water vapor generating device through bearings.

[0073] Preferably, the air supply valve 3, the aerosol dispensing valves 5a, 5b, 5c, 5d, the buffer valves 7a, 7b, 7c, 7d, the purge valve 10 and the pipe discharge valve 17 can be set as manual valves, and the aerosol injection valves 9a, 9b, 9c, 9d, the vacuum valves 11a, 11b, 11c, 11d, the sampling valves 12a, 12b, 12c, the water vapor injection valves 15a, 15b, the delivery valves 16a, 16b, 16c, the dilution valve 19 and the dilution discharge valve 22 can be set as electromagnetic valves. In order to better control the test device.

[0074] The present invention also proposes an experimental method for studying the behavior mechanism of aerosols, using the above-mentioned experimental device for studying the behavior mechanism of aerosols, such as Figure 1 As shown, and includes the following steps:

[0075] In the test preparation step S1, the aerosol buffer system 8 and the interior of the test tube 1 are evacuated to a vacuum state using the vacuum system 23, and air is injected into the test tube 1 through the air supply system 2. The temperature inside the test tube 1 is adjusted to be stable at a preset temperature, and the air pressure inside the test tube 1 is stabilized at the standard atmospheric pressure.

[0076] Specifically, before the test begins, all valves and components of the device are in a closed state. Test preparation step S1 includes the following steps: S1-1, start the vacuum system 23, open the aerosol injection valves 9a, 9b, 9c, 9d and the vacuum valves 11a, 11b, 11c, 11d, and vacuumize the test tube 1 and the aerosol buffer tanks 8a, 8b, 8c, 8d. After the absolute pressure measured by the pressure sensors in the test tube 1 and the aerosol buffer tanks 8a, 8b, 8c, 8d is 0 bar and remains stable, close the vacuum system 23, the aerosol injection valves 9a, 9b, 9c, 9d and the vacuum valves 11a, 11b, 11c, 11d.

[0077] S1-2, turn on the air supply system 2, open the air supply valve 3 and the purge valve 10, adjust the pressure reducing valve 4, inject air into the test tube 1, and when the absolute pressure measured by the pressure sensor in the test tube 1 is 1 bar (or reaches the standard atmospheric pressure) and remains stable, close the air supply valve 3 and the purge valve 10.

[0078] S1-3, turn on the heating tape on the outer wall of the test tube 1, open the tube discharge valve 17, heat the ambient temperature in the test tube 1 to the preset target temperature value T, and after the measurement value of the thermocouple thermometer in the test tube 1 reaches the target temperature value T, adjust the heating power of the heating tape to stabilize the ambient temperature in the test tube 1 at the target temperature value T.

[0079] In the water vapor injection step S2, after the test preparation step S1, the water vapor generation system 13 is turned on, and the generated water vapor is injected into the test tube 1 after reaching a preset temperature, so that the relative humidity in the test tube 1 reaches a preset relative humidity and is stable.

[0080] Specifically, the water vapor injection step S2 includes the following steps: S2-1, turning on the water vapor generating devices 13a, 13b, generating water vapor through the ultrasonic atomizer at the bottom of the water vapor generating device, and the electric heating wires in the middle and upper parts of the water vapor generating device rotate to heat the temperature of the water vapor to the target temperature value T and keep it stable.

[0081] S2-2, open the air supply valve 3, adjust the pressure reducing valve 4, and make the air temperature generated by the air heater of the air supply system 2 reach the target temperature value T and keep it stable.

[0082] S2-3, start the flow regulating system 18, open the water vapor delivery valves 15a, 15b and the water vapor injection valves 24a, 24b. The nozzle at the outlet of the water vapor injection pipeline injects air close to saturated humidity into the test tube 1 by means of free extension and rotation. After the measured values ​​of the relative humidity meters at different positions in the test tube 1 reach the target value and stabilize, close the flow regulating system 18, the water vapor delivery valves 15a, 15b, the water vapor injection valves 24a, 24b, the air supply valve 3 and the pipe discharge valve 17.

[0083] In another embodiment, step S2-3 may also be replaced by the following operation: open the flow regulating system 18, adjust the air flow at the outlet of the flow regulating system 18 to reach a preset value and keep it stable, open the water vapor delivery valves 15a, 15b to inject air into the water vapor generating devices 13a, 13b, so that the relative humidity meter in the water vapor generating devices 13a, 13b reaches a preset value and remains stable, then open the water vapor injection valves 24a, 24b, and inject air with a preset relative humidity into the test tube 1. After the measured values ​​of the relative humidity meters at different positions in the test tube 1 reach the target value and remain stable, close the flow regulating system 18, the water vapor delivery valves 15a, 15b, the water vapor injection valves 24a, 24b, the air supply valve 3 and the tube discharge valve 17.

[0084] Aerosol preparation and injection step S3, after the water vapor injection step S2, start the air supply system 2 and the aerosol distribution system 6, inject aerosol into the aerosol buffer system 8, so that the aerosol in the aerosol buffer system 8 reaches a preset quantitative concentration and a preset temperature and remains stable, and the aerosol buffer system 8 injects aerosol into various positions in the test tube 1, so that the aerosol in various positions in the test tube 1 reaches a preset quantitative concentration and remains stable.

[0085] Specifically, the aerosol preparation and injection step S3 includes the following steps: S3-1, open the air supply valve 3 and the aerosol distribution valves 5a, 5b, 5c, 5d, adjust the pressure reducing valve 4, open the aerosol distribution system 6a, 6b, 6c, 6d, and adjust the outlet pressure of the aerosol distribution system 6a, 6b, 6c, 6d to the target value and stabilize it.

[0086] S3-2, open the buffer valves 7a, 7b, 7c, 7d and the exhaust valves of the aerosol buffer tanks 8a, 8b, 8c, 8d, and inject aerosol into the aerosol buffer tanks 8a, 8b, 8c, 8d. After the measured value of the aerosol number concentration meter in the aerosol buffer tanks 8a, 8b, 8c, 8d reaches the target value and stabilizes, close the aerosol distribution system 6a, 6b, 6c, 6d, the air supply valve 3, the aerosol distribution valves 5a, 5b, 5c, 5d, the buffer valves 7a, 7b, 7c, 7d and the exhaust valves of the aerosol buffer tanks 8a, 8b, 8c, 8d.

[0087] S3-3, turn on the heating belt on the outer wall of the aerosol buffer tanks 8a, 8b, 8c, 8d, heat the ambient temperature inside the aerosol buffer tanks 8a, 8b, 8c, 8d to the target temperature value T, and after the measurement value of the thermocouple thermometer of the aerosol buffer tanks 8a, 8b, 8c, 8d reaches the target temperature value T and stabilizes, adjust the heating power of the heating belt to stabilize the ambient temperature inside the aerosol buffer tanks 8a, 8b, 8c, 8d at the target temperature value T.

[0088] S3-4, turn on the flow regulating system 18, open the air supply valve 3 and the pipe discharge valve 17, adjust the pressure reducing valve 4, open the aerosol injection valves 9a, 9b, 9c, 9d, the water vapor delivery valves 15a, 15b, and the water vapor injection valves 24a, 24b, and inject aerosol into the test pipe section 1. After the aerosol number concentration and the relative humidity meter measurement value in the test pipe section 1 reach the target value and stabilize, close the flow regulating system 18, the air supply valve 3, the pipe discharge valve 17 and the solenoid valves 9a, 9b, 9c, 9d, 15a, 15b, 24a, 24b.

[0089] The aerosols in the aerosol buffer tanks 8a, 8b, 8c, and 8d are injected into the test pipe section 1 under the action of the pressure difference, and the pipe discharge valve 17 is opened to maintain the standard atmospheric pressure in the test pipe section 1. Water vapor is added to the test pipe section 1 through the flow regulation system 18 to maintain the relative humidity in the test pipe section 1 at the target value.

[0090] The sampling and measurement step S4 is located after the aerosol preparation and injection step S3. The aerosol sampling system 14 is turned on to collect multiple samples at different positions in the test tube 1 and transport them to the aerosol measurement system 21. The aerosol measurement system 21 measures the parameters of the particle size distribution, mass concentration and number concentration of the sample aerosol.

[0091] Specifically, the sampling and measurement step S4 includes the following steps: S4-1, open the sampling valves 12a, 12b, 12c, turn on the aerosol sampling system 14 so that the pistons inside the aerosol sampling boxes 14a, 14b, 14c move quickly upward to the top, and the aerosol flows quickly to the inside of the aerosol sampling box through the aerosol sampling pipeline, and close the sampling valves 12a, 12b, 12c and the aerosol sampling system 14.

[0092] S4-2, open the dilution valve 19, the dilution discharge valve 22, start the flow control system 18, and adjust the electric control valves of the branch lines 26 of different diameters so that the air flow of the main line 25 reaches the target value and is stable.

[0093] S4-3, close the dilution discharge valve 22, open the delivery valves 16a, 16b, 16c, start the aerosol sampling system 14 and the aerosol dilution system 20, the pistons inside the aerosol sampling boxes 14a, 14b, 14c of the aerosol sampling system 14 move downward to the lowest end at a fixed speed, the aerosol flows from the inside of the aerosol sampling box to the inside of each compartment of the aerosol dilution system 20, so that the aerosol and the air are diluted at a fixed dilution ratio, and the delivery valves 16a, 16b, 16c and the aerosol sampling system 14 are closed.

[0094] S4-4, the aerosol measurement system 21 is turned on, and the aerosols in the compartments of the aerosol dilution system 20 flow into the aerosol measurement system 21 in sequence to measure parameters such as aerosol particle size distribution, mass concentration and number concentration. After the measurement, the aerosol measurement system 21 is turned off.

[0095] The purge recovery step S5 is located after the sampling and measuring step S4. The aerosol in the aerosol dilution system 20 is purged so that the mass concentration and number concentration of the aerosol in the aerosol dilution system 20 reach the background and are stable. The temperature of the air supplied by the air supply system 2 is reduced to room temperature and remains stable. The inside of the test tube 1 is purged so that the mass concentration and number concentration of the aerosol in the test tube 1 reach the background and are stable, and the test device is returned to the initial state.

[0096] Specifically, the purge recovery step S5 includes the following steps: S5-1, opening the dilution exhaust valve 22, purging the aerosol dilution system 20, so that the aerosol mass concentration and number concentration inside each compartment of the aerosol dilution system 20 reach the background and are stable.

[0097] Preferably, step S5-2 is included, and after S5-1, the above steps S4 and S5-1 are repeated at regular intervals to perform multiple sets of aerosol particle size distribution, mass concentration, number concentration and other parameter measurements to improve the accuracy of the test results.

[0098] S5-3, after completing one or more groups of aerosol parameter measurements, close the flow regulating system 18, open the purge valve 10 and the tube discharge valve 17, close the heating belt on the outer wall of the test tube 1, open the air supply system 2, and close the air heater of the air supply system, so that the air temperature at the outlet of the air supply system 2 drops to room temperature and stabilizes, and the aerosol inside the test tube 1 is purged in all directions by freely changing the air flow area at the outlet of the diffusion nozzle, so that the mass concentration and number concentration of the aerosol inside the test tube 1 reach the background and are stable.

[0099] S5-4, close the air supply valve 3, the purge valve 10, the pipe discharge valve 17, the pressure reducing valve 4 and the air supply system 2, so that the test device returns to the initial state.

[0100] According to the above test method, the test device proposed by the present invention can be used to more accurately conduct test studies on aerosols of different types, particle sizes and number concentrations under different ambient temperatures and different relative humidity conditions.

[0101] In summary, from the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0102] 1. The test device of the present invention ensures that the aerosol always reacts with the water vapor at the same ambient temperature by designing a test tube with a temperature regulating function, an air supply system and a water vapor generating system. The aerosol buffer system can be configured with a certain concentration of aerosol. Combined with the test method proposed in the present invention, it is possible to more accurately conduct test studies on aerosols of different types, particle sizes and number concentrations under different ambient temperatures and relative humidity conditions.

[0103] 2. The test device of the present invention can realize dynamic dilution of aerosol samples and air at a fixed dilution ratio by setting a flow regulating system and an aerosol dilution system, thereby improving the accuracy and continuity of test data obtained by the test device.

[0104] 3. The test device of the present invention can realize the injection of aerosol and water vapor into multiple positions inside the test tube by designing multiple sol injection ports, aerosol sampling ports, water vapor injection ports and corresponding multiple branches on the test tube, so that the distribution of aerosol and water vapor inside the test tube is more uniform, thereby improving the accuracy of data obtained by the test device.

[0105] 4. The aerosol sampling box designed for the test device of the present invention can realize the timed, quantitative and automatic sampling of aerosols, especially the sampling speed is fast to prevent the aerosol from condensing, and can also realize sampling at different radial positions of the test tube, which can improve the data accuracy and operability of the test device and reduce the number of operators and costs.

[0106] 5. The test device of the present invention can realize all-round purge of the inside of the test tube by designing the purge port, so that the aerosol in the test tube is more easily discharged, thereby improving the post-processing efficiency of the test device. The air supply system is provided with a variety of equipment such as high-efficiency filters, which can provide cleaner and drier air.

[0107] 6. The test device of the present invention eliminates the influence of electrostatic adsorption effect on the aerosol wall deposition behavior by designing an antistatic film on the inner wall of the test tube, further improving the accuracy and authenticity of the test data obtained by the test device.

[0108] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An experimental device for studying the mechanism of aerosol behavior, characterized in that: It comprises a test tube (1) connected by connecting pipelines, an air supply system (2), an aerosol distribution system (6), an aerosol buffer system (8), a vacuum system (23), a water vapor generation system (13), an aerosol sampling system (14) and an aerosol measurement system (21); The test tube (1) can adjust its internal temperature to a preset value and keep the internal temperature stable; the air supply system (2) can adjust the air temperature to a preset value and transport it to the aerosol distribution system (6), and transport the aerosol generated by the aerosol distribution system (6) to the aerosol buffer system (8); the vacuum system (23) is used to vacuum the aerosol buffer system (8); the aerosol with a preset quantity concentration at a preset temperature can be prepared in the aerosol buffer system (8) and transported to the test tube (1); the water vapor generation system (13) can generate water vapor at a preset temperature and transport it to the test tube (1), so that the test tube (1) reaches a preset relative humidity; the aerosol sampling system (14) is used to sample the aerosol in the test tube (1) and transport it to the aerosol measurement system (21) for parameter measurement, so that the test device can study the behavior mechanism of aerosols of different quantity concentrations under different ambient temperature and relative humidity conditions.

2. The test device according to claim 1, characterized in that: The test device also includes a flow regulating system (18) and an aerosol dilution system (20), wherein the air supply system (2) is connected to the aerosol dilution system (20) via the flow regulating system (18), and the aerosol dilution system (20) is connected between the aerosol sampling system (14) and the aerosol measuring system (21), wherein the sampled aerosol is diluted with air at a preset dilution ratio in the aerosol dilution system (20).

3. The test device according to claim 2, characterized in that: The air supply system (2) is also connected to the water vapor generation system (13) via the flow regulating system (18), so that air with a preset relative humidity can be prepared in the water vapor generation system (13) and delivered to the test tube (1).

4. The test device according to claim 3, characterized in that: The flow regulating system (18) comprises a main line (25) and a plurality of branch lines (26) of different diameters, one end of each of the plurality of branch lines (26) being connected to the main line (25) and the other end being connected to the atmosphere, and each of the branch lines (26) being provided with a regulating valve with an adjustable opening.

5. The test device according to any one of claims 2 to 4, characterized in that: The test tube (1) is provided with a plurality of aerosol injection ports, a plurality of aerosol sampling ports and more than two water vapor injection ports along the axial direction, which are respectively connected to a plurality of aerosol injection branches, a plurality of aerosol sampling branches and more than two water vapor injection branches.

6. The test device according to claim 5, characterized in that: The aerosol sampling system (14) comprises a plurality of aerosol sampling boxes (14a, 14b, 14c), each of the aerosol sampling branches comprises the aerosol sampling box (14a, 14b, 14c) and a sampling valve (12a, 12b, 12c), each of the aerosol sampling branches is connected to the aerosol dilution system (20) via a delivery valve (16a, 16b, 16c), and a piston movable with a fixed stroke is arranged in the aerosol sampling box (14a, 14b, 14c).

7. The test device according to claim 6, characterized in that: The aerosol dilution system (20) comprises an aerosol dilution container, which comprises a plurality of compartments of the same volume, each of which is respectively connected to each of the aerosol sampling branches, and the flow regulating system (18) is connected to each of the compartments via a dilution valve (19).

8. The test device according to claim 6, characterized in that: Each of the aerosol sampling boxes (14a, 14b, 14c) is connected to the interior of the test tube (1) via an aerosol sampling pipeline. The portion of the aerosol sampling pipeline located inside the test tube (1) includes a sleeve assembly. The sleeve assembly can be extended and retracted to different lengths along the axial direction of the test tube (1) to achieve sampling in different radial directions of the test tube (1).

9. The test device according to claim 5, characterized in that: The aerosol distribution system (6) includes a plurality of aerosol distribution subsystems (6a, 6b, 6c, 6d), the aerosol buffer system (8) includes a plurality of aerosol buffer tanks (8a, 8b, 8c, 8d), each of the plurality of aerosol injection branches includes the aerosol distribution subsystem (6a, 6b, 6c, 6d), the aerosol buffer tank (8a, 8b, 8c, 8d), an aerosol distribution valve (5a, 5b, 5c, 5d), a buffer valve (7a, 7b, 7c, 7d) and an aerosol injection valve (9a, 9b, 9c, 9d), and each of the aerosol buffer tanks (8a, 8b, 8c, 8d) is connected to the vacuum system (23) via a vacuum valve (11a, 11b, 11c, 11d).

10. The test device according to claim 5, characterized in that: The water vapor generation system (13) comprises more than two water vapor generation devices (13a, 13b), each of the water vapor injection branches comprises the water vapor generation device (13a, 13b), a water vapor delivery valve (15a, 15b) and a water vapor injection valve (24a, 24b), the water vapor generation device (13a, 13b) comprises an ultrasonic atomizer and a multi-layer electric heating wire, the multi-layer spiral-shaped electric heating wire is arranged above the ultrasonic atomizer, and both ends of each layer of the electric heating wire are connected to the inner wall of the water vapor generation device (13a, 13b) through bearings.

11. The test device according to claim 10, characterized in that: The water vapor generating device (13a, 13b) is connected to the interior of the test tube (1) via a water vapor injection pipeline, the outer wall of the water vapor injection pipeline is provided with a heat-insulating material, and the outlet of the water vapor injection pipeline is provided with a steam nozzle that can be freely extended and rotated.

12. The test device according to claim 5, characterized in that: The test tube (1) is also provided with a purge port and a discharge port. The purge port is connected to the air supply system (2) via a purge valve (10). The purge port is provided with a diffusion nozzle. Both ends of the outlet of the diffusion nozzle are connected to a shaft that can move axially along the test tube (1) so as to be used for all-round aerosol purge inside the test tube (1).

13. The test device according to claim 1, characterized in that: The inner wall surface of the test tube (1) is provided with a metal oxide antistatic film with a thickness ranging from 0.03 to 0.08 mm.

14. The test device according to claim 1, characterized in that: A heating belt and thermal insulation cotton are arranged on the outer wall of the test tube (1); the heating belt is spirally arranged around the outer wall of the test tube (1); and the material of the thermal insulation cotton includes silicate.

15. The test device according to claim 1, characterized in that: An air supply valve (3) and a pressure reducing valve (4) are provided at the outlet of the air supply system (2). The air supply system (2) comprises an air compressor, an air buffer tank, an air heater, an air dryer and an air high efficiency filter. The air high efficiency filter is used to filter particulate dust and suspended matter with a particle size of more than 0.5 μm.

16. An experimental method for studying the mechanism of aerosol behavior, characterized in that: An experimental device for studying the aerosol behavior mechanism according to any one of claims 1 to 15 above is used, and comprises the following steps: The test preparation step (S1) is to use a vacuum system (23) to evacuate the interior of the aerosol buffer system (8) and the test tube (1) to a vacuum state, and to inject air into the test tube (1) through an air supply system (2), and to adjust the temperature in the test tube (1) to be stabilized at a preset temperature, and the air pressure in the test tube (1) to be stabilized at a standard atmospheric pressure; A water vapor injection step (S2), starting the water vapor generation system (13), and injecting the generated water vapor into the test tube (1) after the water vapor reaches the preset temperature, so that the relative humidity in the test tube (1) reaches the preset relative humidity and is stable; an aerosol preparation and injection step (S3), wherein the air supply system (2) and the aerosol distribution system (6) are turned on to inject aerosol into the aerosol buffer system (8), so that the aerosol in the aerosol buffer system (8) reaches a preset quantitative concentration and a preset temperature and remains stable, and the aerosol buffer system (8) injects aerosol into various positions in the test tube (1), so that the aerosol at various positions in the test tube (1) reaches the preset quantitative concentration and remains stable; The sampling and measuring step (S4) starts the aerosol sampling system (14), collects a plurality of samples at different positions in the test tube (1) and transmits them to the aerosol measuring system (21), and the aerosol measuring system (21) measures the parameters of the particle size distribution, mass concentration and number concentration of the sample aerosol.

17. The test method according to claim 16, characterized in that: In the sampling and measuring step (S4), the flow regulating system (18) is turned on and the air flow at the outlet of the flow regulating system (18) is adjusted to reach a preset value and kept stable, and the sample collected by the aerosol sampling system (14) is first input into the aerosol dilution system (20), so that the sample and air are diluted at a preset dilution ratio and then transported to the aerosol measurement system (21).

18. The test method according to claim 17, characterized in that: In the water vapor injection step (S2), after the water vapor generating system (13) is turned on, the flow regulating system (18) is turned on and the air flow at the outlet of the flow regulating system (18) is adjusted to reach a preset value and remain stable, and air is injected into the water vapor generating system (13) so that the water vapor generating system (13) reaches the preset relative humidity and remains stable, and then injected into the test tube (1).

19. The test method according to claim 17, characterized in that: The test method further comprises a purging recovery step (S5), which is located after the sampling and measuring step (S4), wherein the aerosol in the aerosol dilution system (20) is purged so that the mass concentration and number concentration of the aerosol in the aerosol dilution system (20) reach the background and are stable, the temperature of the air supplied by the air supply system (2) is reduced to room temperature and maintained stable, the inside of the test tube (1) is purged so that the mass concentration and number concentration of the aerosol in the test tube (1) reach the background and are stable, and the test device is returned to an initial state.

20. The test method according to claim 19, characterized in that: In the purge recovery step (S5), after the aerosol mass concentration and number concentration in the aerosol dilution system (20) reach the background and become stable, the sampling and measuring step (S4) may be repeated multiple times to perform multiple sets of aerosol parameter measurements.

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