An experimental device for removing iodine-based aerosols by alkaline and a method for measuring by sampling in different regions

Abstract

The application discloses an iodine aerosol alkaline removal experimental device and a sub-region sampling measurement method, relates to the field of air purification experimental equipment, and comprises a spraying experimental tank with a top hemispherical head and a middle cylinder, and a spraying assembly is connected to the top end of the spraying experimental tank; the top end of the spraying experimental tank is also connected with an iodine aerosol distribution assembly; the bottom end of the spraying experimental tank is connected with an iodine vapor injection assembly, which is used for generating iodine vapor from elemental iodine; the side wall of the spraying experimental tank is connected with a gas phase temperature control assembly and an aerosol measurement assembly; the aerosol measurement assembly comprises sampling tubes located in different regions of the spraying experimental tank, and the aerosol measurement assembly measures the behavior characteristics of iodine aerosols in different regions of the spraying experimental tank through the sampling tubes in different regions; and the application can explore the spraying removal effects of iodine aerosols of different safety shell regions, different spraying liquid compositions, different iodine vapor contents and different types of iodine aerosols.

Description

Technical Field

[0001] This invention relates to the field of air purification experimental equipment, specifically to an experimental device for the alkaline removal of iodine-based aerosols and a method for regional sampling and measurement. Background Technology

[0002] In pressurized water reactor nuclear power plants, radioactive iodine is a fission product of the reactor and is generally contained within the fuel cladding, with very small amounts leaking into the environment. However, in the event of a severe accident involving radioactive leakage in the nuclear reactor, especially when fuel elements melt down or the cladding ruptures, radioactive iodine can leak through the cracks. After a core meltdown accident, a complex environment of high temperature and high humidity is created within the containment vessel under a reducing steam atmosphere, reducing most of the released radioactive iodine into radioactive soluble iodine aerosols (such as CsOH and CsI).

[0003] Removal of radioactive iodine aerosols using alkaline spray solutions is one of the main pathways for such removal. These soluble aerosols exhibit significant hygroscopic growth behavior in the high-humidity environment of the containment and may dissolve in droplets. The pH value of the spray pool is a key factor determining the volatility of iodine, an important fission product. Increasing the pH value can significantly improve iodine aerosol removal and reduce iodine volatilization. However, if the spray solution is alkaline, the particle density, particle size, shape, and chemical composition of iodine aerosols may change in the environment, greatly affecting aerosol coagulation, diffusion, sedimentation, and other kinetic behaviors, thus significantly impacting the aerosol removal efficiency of the spray system.

[0004] Extensive research has been conducted on the spray removal of non-hygroscopic aerosols, but research on alkaline spray removal of iodine-based aerosols is largely lacking, especially when the spray solution is alkaline and involves chemical reactions of iodine. Based on specific experimental conditions, the following are the main challenges:

[0005] a. The interaction between spray droplets and iodine aerosol within the containment space can effectively remove most of the radioactive iodine aerosol within the containment. However, because the spray from the nozzle is cone-shaped, there are areas within the containment that cannot be covered by the spray droplets. The aerosol behavior characteristics in different areas vary significantly, making it impossible to quickly perform real-time, high-precision online monitoring of iodine aerosol in different areas of the alkaline spray removal experimental device.

[0006] b. Currently, the most common aerosol measurement device in the nuclear energy field is the optical particle counter. Its working principle is based on laser diffraction technology; when a laser beam passes through a sample, the particles scatter the light. This scattered light is focused onto a detector and converted into an electrical signal. By analyzing the relationship between the intensity of the scattered light and the particle size, the particle size distribution characteristics are obtained. However, when measuring particle size, the optical particle counter's operating conditions are limited to normal temperature and pressure due to the electronic components in the sensor. High-temperature and high-humidity carrier gas environments, as well as the presence of water droplets under spray conditions, may damage the optical particle counter's measurement probe, ultimately leading to significant errors in the measurement results of soluble iodine aerosols. How to improve the temperature range and humidity resistance of the particle counter, and how to perform online sampling of soluble iodine aerosols and iodine vapor under limited measurement conditions, has become an urgent problem to be solved in this field.

[0007] c. Currently, the Welas 3000 particle size analyzer manufactured by Palas Copco is commonly used in the nuclear energy field. It is equipped with a sampling pipeline heated along the sampling path and a series of series pressure reducing devices to ensure that the carrier gas in the sampling pipeline is in a superheated state, preventing the presence of droplets from affecting the high-precision measurement of aerosols. However, soluble iodine aerosols exhibit significant hygroscopic growth behavior in the high-humidity environment of the containment and may dissolve in droplets. When the carrier gas of iodine aerosol is superheated during sampling, the physical form of iodides may change, leading to a large error in the high-precision analysis of iodine aerosols. Summary of the Invention

[0008] To address the aforementioned shortcomings of existing technologies, this invention provides an experimental apparatus for rapid, real-time, regional measurement of alkaline removal of iodine aerosols and a regional sampling and measurement method.

[0009] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0010] An experimental apparatus for alkaline removal of iodine aerosols is provided, comprising a spray test tank with a top hemispherical head and a middle cylindrical body. A spray assembly is connected to the top of the spray test tank, and the spray assembly is used to spray an alkaline solution into the spray test tank.

[0011] The top of the spray test tank is also connected to an iodine aerosol delivery component, which is used to generate iodine aerosol from iodine compound solution.

[0012] The bottom of the spray test tank is connected to an iodine vapor injection assembly, which is used to generate iodine vapor from elemental iodine.

[0013] It also includes a first air compressor, which is connected to an iodine vapor injection assembly and an iodine aerosol delivery assembly respectively. The first air compressor is used to deliver the generated iodine aerosol and iodine vapor to the spray test tank.

[0014] The side wall of the spray test tank is connected to a gas phase temperature control component and an aerosol measurement component. The gas phase temperature control component is used to control the wall surface and internal gas phase temperature of the spray test tank.

[0015] The aerosol measurement component includes several sampling tubes located in various areas of the spray test tank. The aerosol measurement component measures the behavior characteristics of iodine aerosols in different areas of the spray test tank through the sampling tubes in each area, and obtains the removal efficiency of iodine aerosols by alkaline solution.

[0016] It also includes a controller, which is connected to the spray assembly, the iodine aerosol delivery assembly, the iodine vapor injection assembly, the first air compressor, the gas phase temperature control assembly, and the aerosol measurement assembly, respectively.

[0017] Furthermore, the spray assembly includes a spray head located at the center of the top of the spray test tank. The spray head is connected to an alkaline solution supply assembly via a pipe. The alkaline solution supply assembly includes a mixing tank, the output end of which is connected to the spray head. The mixing tank is connected to an alkaline solution tank and a water tank, and an electric flow valve is installed between the alkaline solution tank and the mixing tank, as well as between the water tank and the mixing tank. A pH meter is installed inside the mixing tank, and both the pH meter and the electric flow valve are electrically connected to the controller.

[0018] Furthermore, the iodine-based aerosol delivery assembly includes an aerosol generator electrically connected to the controller. The input end of the aerosol generator is connected to the first air compressor, and the output end of the aerosol generator is connected to the inside of the spray test tank through an aerosol pipe. The end of the aerosol pipe away from the aerosol generator passes through the top of the spray test tank. The inner wall of the aerosol pipe is coated with an anti-adsorption coating.

[0019] Furthermore, the iodine vapor injection assembly includes an iodine vapor mixing tank, which is connected to a single-element iodine volatilization tank and a steam generator. The output end of the iodine vapor mixing tank is connected to the interior of the spray test tank through an iodine vapor pipeline, and the end of the iodine vapor pipeline away from the iodine vapor mixing tank passes through the bottom side wall of the spray test tank. An electric valve is installed on the iodine vapor pipeline. The input end of the single-element iodine volatilization tank is connected to the first air compressor. The electric valve, the single-element iodine volatilization tank, and the steam generator are all electrically connected to the controller.

[0020] Furthermore, the gas phase temperature control component includes several heating wires installed on the wall of the spray test tank, and several temperature sensors evenly spaced axially inside the spray test tank. The temperature sensors, in conjunction with the heating wires, control the temperature of the inner wall surface and the internal gas phase of the spray test tank. The temperature sensors are connected to the inner wall of the spray test tank via an electric telescopic rod arranged radially along the spray test tank, with the temperature sensor located at the end of the electric telescopic rod away from the inner wall of the spray test tank. The heating wires, temperature sensors, and electric telescopic rod are all electrically connected to the controller.

[0021] Furthermore, the spray test tank includes a suction zone at the top, a circulation zone below the suction zone, and a spray zone below the circulation zone. Sampling tubes are provided in the suction zone, circulation zone, and spray zone.

[0022] The aerosol measurement assembly includes a heating and insulation device installed on each sampling tube and a particle size spectrometer located outside the spray test tank. The heating and insulation device has its heating wire embedded in the wall of the sampling tube.

[0023] The sampling tube is connected to the wall of the spray test tank through a flange, and the sampling tube is located inside the spray test tank. A baffle plate is installed at the end of the sampling tube near the center of the spray test tank.

[0024] The sampling tube passes through the wall of the spray test tank and is connected to the particle size analyzer through a pipeline; the pipeline is equipped with a multi-in-one connector, the input end of which is connected to all the sampling tubes, and the output end of which is connected to the particle size analyzer; the input end of the particle size analyzer is equipped with a cooling device; the heating and insulation device, the particle size analyzer, and the cooling device are all connected to the controller.

[0025] Furthermore, the output end of the multi-in-one connector is also equipped with a cleaning component, which includes a second air compressor. The second air compressor is connected to the cooling device and the multi-in-one connector respectively through a tee connector. An electric valve is installed between the tee connector and the second air compressor. A drain branch pipe is installed between the cooling device and the particle size analyzer. The drain branch pipe is connected to an absorption water tank and is equipped with an electric drain valve. The second air compressor, the electric valve, and the electric drain valve are all connected to the controller.

[0026] Furthermore, it also includes a filtration and emission assembly, which includes a waste liquid outlet located at the bottom of the spray test tank. The waste liquid outlet is connected to a water washing tank via a pipe, and a fiber filter is installed in the water washing tank. An exhaust gas outlet is also located at the top of the spray test tank, and the exhaust gas outlet is connected to the fiber filter via a pipe. Both the waste liquid outlet and the exhaust gas outlet are equipped with electric valves connected to the controller.

[0027] Furthermore, the side wall of the spray test tank is also equipped with an observation window and an inspection door.

[0028] A method for regional sampling and measurement using the above-mentioned alkaline removal experimental apparatus for iodine aerosols includes the following steps:

[0029] S1: Prepare an iodine compound solution;

[0030] S2: Control the gas phase temperature control component to heat the inside of the spray test tank to the set temperature;

[0031] S3: Control the steam generator to generate steam and mix it with elemental iodine in the elemental iodine volatilization tank in the iodine vapor mixing tank to obtain iodine vapor; control the aerosol generator to generate iodine aerosols with a set particle size; and use the first air compressor to transport the iodine vapor and iodine aerosols to the spray test tank.

[0032] S4: Measure the concentration of iodine aerosols in different areas of the spray test tank using the aerosol measurement component. When the concentration of iodine aerosols in the spray pipe reaches the set value and the concentration error in different areas is less than 10%, stop the delivery of iodine vapor and iodine aerosols.

[0033] S5: Control the spray assembly to spray an alkaline solution with a set pH value into the spray test tank multiple times, and measure and record the concentration of iodine aerosols in different areas of the spray test tank after each spray using the aerosol measuring assembly.

[0034] S6: The residue inside the spray test tank and pipes is cleaned by the cleaning component to complete the alkaline removal experiment of iodine aerosol.

[0035] The beneficial effects of this invention are as follows:

[0036] 1. This invention utilizes a soluble iodine aerosol delivery component, an alkaline spraying component, and a regionally rapid online iodine aerosol measurement component. This allows for precise control of experimental conditions and accurate measurement of experimental parameters. This invention can investigate the spraying removal effects on different containment areas, different spraying liquid compositions, different iodine vapor contents, and different types of iodine aerosols.

[0037] 2. This invention can quickly measure the behavior characteristics of iodine aerosols in high-temperature and high-humidity gas phase space in real time by region, study the aerosol information that changes over time, and obtain the removal efficiency of alkaline solution spraying.

[0038] 3. This invention can measure the chemical composition of waste liquid and analyze the chemical reaction between iodine aerosol and alkaline spray liquid by using a filter discharge component.

[0039] 4. This invention expands the working range of the ambient temperature and pressure optical particle counter by using a cooling device. Attached Figure Description

[0040] Figure 1 This is a partial structural diagram of the present invention;

[0041] Figure 2 This is a schematic diagram of the internal structure of the spray test tank at the sampling tube.

[0042] Figure 3 A schematic diagram of the aerosol measurement and cleaning components;

[0043] Figure 4 This is a schematic diagram of the internal structure of the spray test tank;

[0044] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0045] The components include: 1. Spray test tank; 101. Entrainment zone; 102. Circulation zone; 103. Spray zone; 2. First air compressor; 3. Sampling tube; 4. Spray head; 401. Mixing tank; 402. Alkali tank; 403. Water tank; 501. Aerosol generator; 502. Aerosol pipeline; 601. Iodine vapor mixing tank; 602. Elemental iodine volatilization tank; 603. Steam generator; 604. Iodine vapor pipeline; 7. Heating wire; 8. Temperature sensor; 9. Electric telescopic rod; 10. Flange; 11. Liquid baffle; 121. Heating and insulation device; 122. Particle size spectrometer; 123. Cooling device; 131. Second air compressor; 132. Sewage branch pipe; 133. Absorption water tank; 134. Electric sewage valve; 14. Waste liquid outlet; 15. Washing pool; 16. Exhaust gas outlet; 17. Observation window. Detailed Implementation

[0046] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0047] like Figure 1-5 As shown, an alkaline removal experimental device for iodine aerosols includes a spray test tank 1 with a top hemispherical head and a middle cylindrical body. A spray assembly is connected to the top of the spray test tank 1, and the spray assembly is used to spray an alkaline solution into the spray test tank 1.

[0048] The top of the spray test tank 1 is also connected to an iodine aerosol delivery component, which is used to generate iodine aerosol from the iodine compound solution.

[0049] The bottom of the spray test tank 1 is connected to an iodine vapor injection assembly, which is used to generate iodine vapor from elemental iodine.

[0050] It also includes a first air compressor 2, which is connected to the iodine vapor injection component and the iodine aerosol delivery component respectively. The first air compressor 2 is used to deliver the generated iodine aerosol and iodine vapor to the spray test tank 1. In specific implementation, the output end of the first air compressor 2 is equipped with a drying and condensing device to avoid the moisture in the air from causing errors in the aerosol delivery process.

[0051] The side wall of the spray test tank 1 is connected to a gas phase temperature control component and an aerosol measurement component. The gas phase temperature control component is used to control the gas phase temperature of the wall and inside of the spray test tank 1.

[0052] The aerosol measurement component includes sampling tubes 3 located in different areas of the spray test tank 1. The aerosol measurement component measures the behavioral characteristics of iodine-based aerosols in different areas of the spray test tank 1 through the sampling tubes 3, obtaining the removal efficiency of the alkaline solution for iodine-based aerosols. For easy viewing, Figure 1 The document only shows the sampling tube 3 located in the spray zone 103. In actual implementation, the sampling tube 3 is set in the suction zone 101, the circulation zone 102 and the spray zone 103.

[0053] It also includes a controller, which is connected to the spray assembly, the iodine aerosol delivery assembly, the iodine vapor injection assembly, the first air compressor 2, the gas phase temperature control assembly, and the aerosol measurement assembly. The controller is used to control the electronic and electrical equipment within each assembly. In specific implementations, the controller is a personal computer (PC).

[0054] The spray assembly includes a spray head 4 located at the top center of the spray test tank 1. In practice, the spray head 4 is connected to the spray test tank 1 via a hollow screw. The hollow screw facilitates maintenance and replacement of the spray head 4, and also facilitates the study of the adsorption performance of the spray head 4 at different spray angles on iodine aerosols when spraying alkaline solutions. The spray head 4 is connected to an alkaline solution supply assembly via a pipe. The alkaline solution supply assembly includes a mixing tank 401, the output end of which is connected to the spray head 4. The mixing tank 401 is connected to an alkaline solution tank 402 and a water tank 403. Electric flow valves are installed between the alkaline solution tank 402 and the mixing tank 401, as well as between the water tank 403 and the mixing tank 401. A pH meter is installed inside the mixing tank 401. Both the pH meter and the electric flow valves are electrically connected to a controller. In practice, water pumps connected to the controller are installed between the mixing tank 401 and the spray head 4, between the alkali tank 402 and the mixing tank 401, and between the water tank 403 and the mixing tank 401. A flow meter and a pressure gauge are installed between the mixing tank 401 and the spray head 4 to control the spray volume and spray pressure of the spray head 4.

[0055] The iodine-based aerosol delivery assembly includes an aerosol generator 501 electrically connected to a controller. In specific implementations, the aerosol generator 501 is a PALAS AGK2000 model. The input and output ends of the aerosol generator 501 are respectively equipped with a pressure reducing valve and a shut-off valve. The input end of the aerosol generator 501 is connected to the first air compressor 2, and the output end of the aerosol generator 501 is connected to the inside of the spray test tank 1 through an aerosol pipe 502. The end of the aerosol pipe 502 away from the aerosol generator 501 passes through the top of the spray test tank 1. The inner wall of the aerosol pipe 502 is coated with an anti-adsorption coating.

[0056] The iodine vapor injection assembly includes an iodine vapor mixing tank 601, which is connected to a single-element iodine vapor evaporation tank 602 and a steam generator 603. The output end of the iodine vapor mixing tank 601 is connected to the interior of the spray test tank 1 via an iodine vapor pipeline 604. One end of the iodine vapor pipeline 604 away from the iodine vapor mixing tank 601 passes through the bottom side wall of the spray test tank 1. An electric valve is installed on the iodine vapor pipeline 604. The input end of the single-element iodine vapor evaporation tank 602 is connected to a first air compressor 2. The electric valve, the single-element iodine vapor evaporation tank 602, and the steam generator 603 are all electrically connected to a controller. In specific implementation, the single-element iodine vapor evaporation tank 602 is a tank equipped with a heating wire. The heating wire is controlled to heat to a set temperature to cause the single-element iodine to evaporate, and the first air compressor 2 delivers air to carry the evaporated iodine into the spray test tank 1.

[0057] The gas phase temperature control component includes several heating wires 7 installed on the wall of the spray test tank 1. Several temperature sensors 8 are axially and evenly spaced within the spray test tank 1. These temperature sensors 8, in conjunction with the heating wires 7, control the temperature of the spray test tank 1 wall and the internal gas phase. The temperature sensors 8 are connected to the inner wall of the spray test tank 1 via an electric telescopic rod 9 arranged radially along the tank 1, with the temperature sensor 8 located at the end of the electric telescopic rod 9 furthest from the inner wall. The heating wires 7, temperature sensors 8, and electric telescopic rod 9 are all electrically connected to a controller. In practice, several temperature sensors 8 are also installed on the outer wall of the spray test tank 1. Simultaneous temperature monitoring using the temperature sensors 8 on the electric telescopic rod 9 and the outer wall of the spray test tank 1 generates real-time temperature signals. When the gas phase temperature is insufficient, a control signal controls the DC power supply, thereby controlling the power of the heating wires 7 to achieve temperature regulation.

[0058] The spray test tank 1 includes a suction zone 101 at the top, a circulation zone 102 below the suction zone 101, and a spray zone 103 below the circulation zone 102. Sampling tubes 3 are provided in the suction zone 101, the circulation zone 102, and the spray zone 103.

[0059] The aerosol measurement assembly includes a heating and insulation device 121 installed on each sampling tube 3 and a particle size spectrometer 122 located outside the spray test tank 1. The heating wire 7 of the heating and insulation device 121 is embedded in the tube wall of the sampling tube 3. The heating and insulation device 121 can prevent the iodine aerosol and iodine vapor condensation section from being too long, which would cause a large measurement error.

[0060] The sampling tube 3 is connected to the wall of the spray test tank 1 through the flange 10, and the sampling tube 3 is located inside the spray test tank 1. A baffle plate 11 is provided at one end of the sampling tube 3 near the center of the spray test tank 1. The baffle plate 11 can prevent the spray water from affecting the sampling at the sampling point.

[0061] Sampling tube 3 passes through the wall of spray test tank 1 and is connected to particle size spectrometer 122 via a pipe. A multi-in-one connector is installed on the pipe. The input end of the multi-in-one connector is connected to all sampling tubes 3 respectively, and the output end of the multi-in-one connector is connected to particle size spectrometer 122. A cooling device 123 is installed at the input end of particle size spectrometer 122. A short-distance cooling device 123 is arranged at the rear end of the sampling channel where it is connected to the probe of particle size spectrometer 122. This can reduce the condensation section and aerosol condensation loss, and can also meet the requirement of cooling the sampling gas flow when the gas phase temperature is too high in some working conditions, thus expanding the sampling working environment of particle size spectrometer 122. Heating and insulation device 121, particle size spectrometer 122 and cooling device 123 are all connected to the controller.

[0062] The output end of the multi-in-one connector is also equipped with a cleaning component, which includes a second air compressor 131. The second air compressor 131 is connected to the cooling device 123 and the multi-in-one connector respectively through a tee connector. An electric valve is installed between the tee connector and the second air compressor 131. A drain branch pipe 132 is installed between the cooling device 123 and the particle size analyzer 122. The drain branch pipe 132 is connected to the absorption water tank 133, and an electric drain valve 134 is installed on the drain branch pipe 132. The second air compressor 131, the electric valve, and the electric drain valve 134 are all connected to the controller.

[0063] It also includes a filtration and discharge assembly, which includes a waste liquid outlet 14 located at the bottom of the spray test tank 1. The waste liquid outlet 14 is connected to a water washing tank 15 via a pipe, and a fiber filter is installed in the water washing tank 15. An exhaust gas outlet 16 is also located at the top of the spray test tank 1, and the exhaust gas outlet 16 is connected to the fiber filter via a pipe. Both the waste liquid outlet 14 and the exhaust gas outlet 16 are equipped with electric valves connected to a controller. In specific implementation, since the spray water contains alkaline substances, dilute hydrochloric acid needs to be added to the water tank and the pH value needs to be measured with a pH meter until the pH value of the waste liquid is between 6.5 and 7.5.

[0064] The side wall of the spray test tank 1 is also equipped with an observation window 17 and an inspection door.

[0065] A method for regional sampling and measurement using the above-mentioned alkaline removal experimental apparatus for iodine aerosols includes the following steps:

[0066] S1: Prepare an iodine compound solution;

[0067] S2: Control the gas phase temperature control component to heat the spray test tank 1 to the set temperature;

[0068] S3: Control the steam generator 603 to generate steam and mix it with the elemental iodine in the elemental iodine volatilization tank 602 in the iodine vapor mixing tank 601 to obtain iodine vapor; control the aerosol generator 501 to generate iodine aerosols with a set particle size; and use the first air compressor 2 to transport the iodine vapor and iodine aerosols to the spray test tank 1.

[0069] S4: Measure the concentration of iodine aerosols in different areas of the spray test tank 1 using the aerosol measurement component. When the concentration of iodine aerosols in the spray pipe reaches the set value and the concentration error in different areas is less than 10%, stop the delivery of iodine vapor and iodine aerosols.

[0070] S5: Control the spraying assembly to spray an alkaline solution with a set pH value into the spraying test tank 1 multiple times, and measure and record the concentration of iodine aerosols in different areas of the spraying test tank 1 after each spraying using the aerosol measuring assembly.

[0071] S6: The residue inside the spray test tank 1 and the pipeline is cleaned by the cleaning component to complete the alkaline removal experiment of iodine aerosol.

Claims

1. An experimental apparatus for the alkaline removal of iodine-based aerosols, characterized in that, A spray test tank (1) including a top hemispherical head and a middle cylindrical body, wherein a spray assembly is connected to the top of the spray test tank (1), and the spray assembly is used to spray an alkaline solution into the spray test tank (1). The top of the spray test tank (1) is also connected to an iodine aerosol delivery component, which is used to generate iodine aerosol from iodine compound solution. The bottom end of the spray test tank (1) is connected to an iodine vapor injection assembly, which is used to generate iodine vapor from elemental iodine. It also includes a first air compressor (2), which is connected to an iodine vapor injection component and an iodine aerosol delivery component respectively. The first air compressor (2) is used to deliver the generated iodine aerosol and iodine vapor to the spray test tank (1). The side wall of the spray test tank (1) is connected to a gas phase temperature control component and an aerosol measurement component. The gas phase temperature control component is used to control the gas phase temperature of the wall and inside of the spray test tank (1). The aerosol measurement component includes several sampling tubes (3) located in each area of ​​the spray test tank (1). The aerosol measurement component measures the behavior characteristics of iodine aerosols in different areas of the spray test tank (1) through several sampling tubes (3) in each area, and obtains the removal efficiency of alkaline solution for iodine aerosols. It also includes a controller, which is connected to the spray assembly, the iodine aerosol delivery assembly, the iodine vapor injection assembly, the first air compressor (2), the gas phase temperature control assembly and the aerosol measurement assembly respectively; The spray test tank (1) includes a suction zone (101) at the top, a circulation zone (102) below the suction zone (101) and a spray zone (103) below the circulation zone (102). Sampling tubes (3) are provided in the suction zone (101), circulation zone (102) and spray zone (103). The aerosol measurement assembly includes a heating and heat preservation device (121) installed on each sampling tube (3) and a particle size spectrometer (122) located outside the spray test tank (1). The heating wire of the heating and heat preservation device (121) is embedded in the tube wall of the sampling tube (3). The sampling tube (3) is connected to the tank wall of the spray test tank (1) through the flange (10), and the sampling tube (3) is located inside the spray test tank (1). A baffle plate (11) is provided at one end of the sampling tube (3) near the center of the spray test tank (1). The sampling tube (3) passes through the wall of the spray test tank (1) and is connected to the particle size spectrometer (122) through a pipe; a multi-in-one connector is provided on the pipe, the input end of the multi-in-one connector is connected to all the sampling tubes (3) respectively, and the output end of the multi-in-one connector is connected to the particle size spectrometer (122); a cooling device (123) is provided at the input end of the particle size spectrometer (122); the heating and heat preservation device (121), the particle size spectrometer (122) and the cooling device (123) are all connected to the controller.

2. The experimental apparatus for alkaline removal of iodine aerosols according to claim 1, characterized in that, The spray assembly includes a spray head (4) located at the top center of the spray test tank (1). The spray head (4) is connected to an alkaline solution supply assembly via a pipe. The alkaline solution supply assembly includes a mixing tank (401). The output end of the mixing tank (401) is connected to the spray head (4). The mixing tank (401) is connected to an alkaline solution tank (402) and a water tank (403). Electric flow valves are provided between the alkaline solution tank (402) and the mixing tank (401) and between the water tank (403) and the mixing tank (401). A pH meter is provided inside the mixing tank (401). The pH meter and the electric flow valve are both electrically connected to the controller.

3. The experimental apparatus for alkaline removal of iodine aerosols according to claim 1, characterized in that, The iodine aerosol delivery assembly includes an aerosol generator (501) electrically connected to a controller. The input end of the aerosol generator (501) is connected to a first air compressor (2). The output end of the aerosol generator (501) is connected to the inside of the spray test tank (1) through an aerosol pipe (502). The end of the aerosol pipe (502) away from the aerosol generator (501) passes through the top of the spray test tank (1). The inner wall of the aerosol pipe (502) is coated with an anti-adsorption coating.

4. The experimental apparatus for alkaline removal of iodine aerosols according to claim 1, characterized in that, The iodine vapor injection assembly includes an iodine vapor mixing tank (601), which is connected to a single iodine vapor evaporator (602) and a steam generator (603). The output end of the iodine vapor mixing tank (601) is connected to the interior of the spray test tank (1) through an iodine vapor pipeline (604). The end of the iodine vapor pipeline (604) away from the iodine vapor mixing tank (601) passes through the bottom side wall of the spray test tank (1). An electric valve is installed on the iodine vapor pipeline (604). The input end of the single iodine vapor evaporator (602) is connected to the first air compressor (2). The electric valve, the single iodine vapor evaporator (602), and the steam generator (603) are all electrically connected to the controller.

5. The experimental apparatus for alkaline removal of iodine aerosols according to claim 1, characterized in that, The gas phase temperature control component includes several heating wires (7) installed on the wall of the spray test tank (1). Several temperature sensors (8) are evenly spaced axially inside the spray test tank (1). The temperature sensors (8) work with the heating wires (7) to control the gas phase temperature of the wall and inside the spray test tank (1). The temperature sensors (8) are connected to the inner wall of the spray test tank (1) via an electric telescopic rod (9) arranged radially along the spray test tank (1). The temperature sensors (8) are located at the end of the electric telescopic rod (9) away from the inner wall of the spray test tank (1). The heating wires (7), temperature sensors (8) and electric telescopic rod (9) are all electrically connected to the controller.

6. The experimental apparatus for alkaline removal of iodine aerosols according to claim 1, characterized in that, The output end of the multi-in-one connector is also provided with a cleaning component, which includes a second air compressor (131). The second air compressor (131) is connected to the cooling device (123) and the multi-in-one connector respectively through a three-way connector. An electric valve is provided between the three-way connector and the second air compressor (131). A drain branch pipe (132) is provided between the cooling device (123) and the particle size analyzer (122). The drain branch pipe (132) is connected to an absorption water tank (133), and an electric drain valve (134) is provided on the drain branch pipe (132). The second air compressor (131), the electric valve, and the electric drain valve (134) are all connected to the controller.

7. The experimental apparatus for alkaline removal of iodine aerosols according to claim 1, characterized in that, It also includes a filtration and discharge assembly, which includes a waste liquid outlet (14) located at the bottom of the spray test tank (1), the waste liquid outlet (14) being connected to a water washing tank (15) via a pipe, and a fiber filter being installed in the water washing tank (15); an exhaust gas outlet (16) is also provided at the top of the spray test tank (1), the exhaust gas outlet (16) being connected to the fiber filter via a pipe; and electric valves connected to a controller are provided at both the waste liquid outlet (14) and the exhaust gas outlet (16).

8. The experimental apparatus for alkaline removal of iodine aerosols according to claim 1, characterized in that, The side wall of the spray test tank (1) is also provided with an observation window (17) and an inspection door.

9. A method for regional sampling and measurement using the experimental apparatus for alkaline removal of iodine aerosols according to any one of claims 1-8, comprising the following steps: S1: Prepare an iodine compound solution; S2: Control the gas phase temperature control component to heat the inside of the spray test tank to the set temperature; S3: Control the steam generator to generate steam and mix it with elemental iodine in the elemental iodine volatilization tank in the iodine vapor mixing tank to obtain iodine vapor; control the aerosol generator to generate iodine aerosols with a set particle size; and use the first air compressor to transport the iodine vapor and iodine aerosols to the spray test tank. S4: Measure the concentration of iodine aerosols in different areas of the spray test tank using the aerosol measurement component. When the concentration of iodine aerosols in the spray pipe reaches the set value and the concentration error in different areas is less than 10%, stop the delivery of iodine vapor and iodine aerosols. S5: Control the spray assembly to spray an alkaline solution with a set pH value into the spray test tank multiple times, and measure and record the concentration of iodine aerosols in different areas of the spray test tank after each spray using the aerosol measuring assembly. S6: The residue inside the spray test tank and pipes is cleaned by the cleaning component to complete the alkaline removal experiment of iodine aerosol.

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