Method for determining deposition rate of aerosol system

Abstract

The embodiment of the invention relates to the technical field of reactor accident analysis, in particular to a method for determining the deposition rate of an aerosol system, which comprises the following steps: S1, determining gas space parameters of the aerosol system under a predetermined working condition, gas parameters under the predetermined working condition and physical property parameters of various types of aerosols in the aerosol system; s2, determining a deposition mode of the aerosol system under a predetermined working condition; s3, determining deposition velocities of all aerosols in the aerosol system according to the deposition mode determined in the step S2, the gas parameters under the predetermined working condition determined in the step S1 and the physical property parameters of various aerosols in the aerosol system; and S4, determining the deposition rate of the aerosol system according to the deposition rate determined in the step S3 and the gas space parameters determined in the step S1. According to the method provided by the embodiment of the invention, the deposition behavior of an aerosol system composed of two aerosols with different components can be researched, so that the defects of the current aerosol behavior research and analysis model are overcome.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of reactor accident analysis, and in particular to a method for determining the deposition rate of an aerosol system. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] When a serious accident occurs in a nuclear power plant, radioactive substances are mainly released in the form of fission gas and aerosol. Among them, fission gas can include Kr, Xe and other gases, and aerosol can include I, Br, Cs, Rb, Te, Sb, Se, Ba, Sr and other nuclides. Aerosol refers to liquid or solid particles suspended in gas, and its particle size range is generally 0.1μm to 100μm.

[0004] The release and migration of aerosols are mainly affected by the behavior of the particles themselves and the environmental conditions of severe accidents. In severe accident analysis models, the deposition behavior of aerosols of a single component is generally modeled. However, due to the coagulation behavior of particles, particles of different components may also aggregate together due to coagulation. The existing aerosol behavior analysis model does not consider the deposition behavior of aerosol systems composed of particles of different components. Therefore, the existing aerosol behavior analysis model is not applicable. Summary of the invention

[0005] A brief overview of the present application is provided below in order to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0006] An embodiment of the present application provides a method for determining the deposition rate of an aerosol system, wherein the aerosol system includes a first aerosol and a second aerosol, and the method includes the following steps: S1, determining the air space parameters of the aerosol system under predetermined working conditions, the gas parameters under predetermined working conditions, and the physical properties of various types of aerosols in the aerosol system; S2, determining the deposition mode of the aerosol under predetermined working conditions; S3, determining the deposition rate of all aerosols in the aerosol system according to the deposition mode determined in step S2 and the gas parameters under predetermined working conditions determined in step S1, and the physical properties of various types of aerosols in the aerosol system; S4, determining the deposition rate of the aerosol system according to the deposition rate determined in step S3 and the air space parameters determined in step S1; wherein the air space parameters include the length value, width value, and height value of the air space, the gas parameters include the gas humidity and gas temperature, and the physical properties include the density and particle size range of the aerosol.

[0007] The method provided in the embodiments of the present application can determine the deposition rate of the aerosol system by determining the air space parameters of the aerosol system and the physical properties of each type of aerosol in the aerosol system under predetermined operating conditions. This can enable the study of the deposition behavior of an aerosol system composed of two aerosols of different components to make up for the shortcomings of the current aerosol behavior research and analysis model.

[0008] These and other advantages of the present application will become more apparent through the following detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to further illustrate the above and other advantages and features of the present application, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. The accompanying drawings together with the following detailed description are included in this specification and form a part of this specification. Elements with the same function and structure are represented by the same reference numerals. It should be understood that these drawings only describe typical examples of the present application and should not be regarded as limiting the scope of the present application.

[0010] Figure 1 is a schematic diagram of an aerosol system according to an embodiment of the present application;

[0011] Figure 2 is a schematic flow chart of a method for determining a deposition rate of an aerosol system according to an embodiment of the present application;

[0012] Figure 3 is a schematic diagram of aerosol gravity sedimentation according to an embodiment of the present application;

[0013] Figure 4 Schematic diagram of aerosol Brownian diffusion according to an embodiment of the present application.

[0014] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding.

[0015] Description of reference numerals:

[0016] 10. aerosol system; 101. first aerosol; 102. second aerosol;

[0017] 301, third aerosol; 302, first thermal component;

[0018] 401. Fourth aerosol; 402. Second thermal component. DETAILED DESCRIPTION

[0019] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0020] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0021] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in this application should have the common meanings understood by persons with ordinary skills in the field to which this application belongs.

[0022] In the description of the embodiments of the present application, “plurality” means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In the current aerosol behavior analysis model, the main principle is to use mathematical methods to describe the general dynamic equation (GDE) based on Smoluchowski mean field theory. The GDE equation is a number density function control equation with the volume or mass of the aerosol as the internal variable. The general variable symbol is written as n(v,t), where n represents the number of aerosols in units of pieces; v represents the volume of the aerosol in units of m. 3; t represents time, in seconds. The particle system described by the GDE equation usually only has differences in volume or mass, but no differences in material properties.

[0024] In the related technologies, aerosol behavior analysis models in the field of nuclear engineering are mostly based on the use of numerical methods to solve the zero-dimensional single variable GDE equation. However, in actual situations, due to the condensation / aggregation and other behaviors between aerosols, the aerosol system may be an agglomerate composed of aerosols of multiple different components. The existing GDE equation cannot be applied to the application scenarios that describe the aerosol behavior of agglomerates composed of particles of multiple different components.

[0025] In response to the above technical problems, an embodiment of the present application provides a method for determining the deposition rate of an aerosol system. Figure 1 is a schematic diagram of an aerosol system according to an embodiment of the present application, such as Figure 1 As shown, the aerosol system 10 may include a first aerosol 101 and a second aerosol 102 .

[0026] In some embodiments, the aerosol system 10 is a mixture of a first aerosol 101 and a second aerosol 102 having different properties (eg, different densities).

[0027] In some embodiments, the mass of the first aerosol 101 and the mass of the second aerosol 102 satisfy the following expressions (1) and (2), respectively:

[0028] m I =v I ρ I (1);

[0029] m II =v II ρ II (2).

[0030] Among them, m I represents the mass of the first aerosol 101; v I represents the volume of the first aerosol 101; ρ I represents the density of the first aerosol 101; m II represents the mass of the second aerosol 102; v II represents the volume of the second aerosol 102; ρ II represents the density of the second aerosol 102 .

[0031] In some embodiments, the mass percentage and volume percentage of the first aerosol 101 in the aerosol system 10 satisfy the following expressions (3) to (6):

[0032] m Λ =mI +m II (3);

[0033] ρ Λ v Λ =ρ I v I +ρ II v II (4);

[0034]

[0035] Among them, m Λ represents the mass of the aerosol system 10; v Λ represents the volume of the aerosol system 10; ρ Λ represents the density of the aerosol system 10; φ I represents the mass percentage of the first aerosol 101 in the aerosol system 10; It represents the volume percentage of the first aerosol 101 in the aerosol system 10 .

[0036] Figure 2 is a schematic flow chart of a method for determining the deposition rate of an aerosol system according to an embodiment of the present application, such as Figure 2 As shown, the method may include the following steps S1 to S4.

[0037] S1. Determine the air space parameters of the aerosol system 10 under predetermined working conditions, the gas parameters under predetermined working conditions, and the physical properties of various types of aerosols in the aerosol system 10, wherein the air space parameters include the length, width and height of the air space, the gas parameters include the gas humidity and gas temperature, and the physical properties include the density and particle size range of the aerosol.

[0038] S2. Determine the deposition mode of the aerosol system under predetermined operating conditions.

[0039] S3. Determine the deposition rate of all aerosols in the aerosol system 10 according to the deposition method determined in step S2, the gas parameters under the predetermined working conditions determined in step S1, and the physical properties of each type of aerosol in the aerosol system 10.

[0040] S4. Determine the deposition rate of the aerosol system 10 according to the deposition speed determined in step S3 and the air space parameter determined in step S1.

[0041] The method provided in the embodiment of the present application can determine the deposition rate of the aerosol system 10 by determining the air space parameters of the aerosol system 10, the physical parameters of each type of aerosol in the aerosol system 10 and the deposition mode of the aerosol system under predetermined working conditions. In this way, it is possible to study the deposition behavior of the aerosol system 10 composed of two aerosols of different components, so as to make up for the shortcomings of the current aerosol behavior research and analysis model.

[0042] In some embodiments, the aerosol deposition method may include gravity settling (S ed ), Brownian diffusion (D if ), thermophoresis (T ph ), diffusion phoresis (D ph )wait.

[0043] In some embodiments, the particle size of each aerosol in the aerosol system 10 is in the range of 0.01-10 μm.

[0044] In some embodiments, in step S4, the deposition rate, deposition velocity, and air space parameter of the aerosol system 10 satisfy the following first expression (7):

[0045]

[0046]

[0047] Among them, M k,l represents the moment of the deposition system, satisfying the following expression (8):

[0048]

[0049] Wherein, k represents the Taylor expansion order of the aerosol system 10, k = 0, 1, 2, 3 ..., and k is an integer; l represents the Taylor expansion order of the first aerosol 101, l = 0, 1, 2, 3 ..., and l is an integer; V represents the volume of the air space where the aerosol system 10 is located; A Sed Represents the deposition area of ​​the aerosol system under gravity sedimentation; A Dif A represents the deposition area of ​​the aerosol system under the Brownian diffusion deposition mode; Tph A represents the deposition area of ​​the aerosol system under the thermophoretic deposition mode; Dph represents the deposition area of ​​the aerosol system under the diffusion phoresis deposition mode; v Sed It represents the deposition velocity of the aerosol system on the deposition area corresponding to the gravity sedimentation deposition mode; v Dif represents the deposition velocity of the aerosol system on the deposition area corresponding to the Brownian diffusion deposition mode; v Tph represents the deposition velocity of the aerosol system on the deposition area corresponding to the thermophoretic deposition method; vDph represents the deposition velocity of the aerosol system on the deposition area corresponding to the diffusion phoresis deposition mode; u1 represents the center point of the Taylor expansion of the aerosol system 10; u2 represents the center point of the Taylor expansion of the first aerosol 101; N 0,0 、M 1,0 、M 0,1 、M 1,1 、M 2,0 and M 0,2 They represent different initial moments respectively.

[0050] The embodiment of the present application determines the deposition rate of the aerosol system 10 through the first expression (7), which is more efficient and more accurate.

[0051] In some embodiments, for the two-component aerosol number density function n(v Λ ,v I ,t), we can construct the following expression (9):

[0052]

[0053] Wherein, k represents the Taylor expansion order of the aerosol system 10, k = 0, 1, 2, 3 ..., and k is an integer; l represents the Taylor expansion order of the first aerosol 101, l = 0, 1, 2, 3 ..., and l is an integer.

[0054] For expression (9), by changing v Λ k v I l By processing, the integral form can be removed. For the internal variable v Λ and v I , the expression in which it is located can be Taylor expanded. The center points of Taylor expansion are defined as u1 and u2, which satisfy the following expression (10):

[0055]

[0056] Among them, u1 represents v Λ k The center point of the Taylor expansion is usually the average volume of the aerosol system 10, that is, u2 represents v I l The center point of the Taylor expansion is usually the average volume of the first aerosol 101, that is,

[0057] In some embodiments, by substituting expression (10) into expression (9), the above expression (8) can be obtained.

[0058] In some embodiments, according to the principle of the two-component aerosol Taylor expansion moment method, six initial moments M can be obtained by solving the following equations: 0,0 , M 1,0 , M 0,1 , M 1,1 , M 2,0 and M 0,2 The evolution expression of (11):

[0059]

[0060] Among them, M C1 ,M C3 represents the dimensionless moment, B2 represents a constant related to aerosol properties, B2 = 2k B T / 3μ, k B represents the Boltzmann constant, T represents temperature, the unit is K, μ represents gas viscosity, the unit is Pa·s; t represents time.

[0061] In some embodiments, by solving the moment equation group corresponding to expression (11), the results of the six initial moments can be obtained, and then the evolution law of the moment model of any order can be obtained by substituting it into expression (8) as needed, and the migration of aerosols can be calculated according to the physical model involved in the aerosol behavior analysis model. Compared with the traditional partitioning method, the method of the embodiment of the present application requires fewer equations to be solved, which is conducive to improving calculation efficiency.

[0062] In some embodiments, for the four deposition behaviors of the aerosol, the deposition rate of the aerosol system 10 satisfies the following expression (12):

[0063]

[0064] Among them, R(v Λ ,v I ) represents the deposition rate of the aerosol system 10, in units of pieces / s; v Λ Indicates the volume of the air space where the aerosol system 10 is located, in m 3 ; A Sed It represents the deposition area of ​​the aerosol system under gravity sedimentation, in m 2 ; A Dif A represents the deposition area of ​​the aerosol system under the Brownian diffusion deposition mode; Tph A represents the deposition area of ​​the aerosol system under the thermophoretic deposition mode; Dph represents the deposition area of ​​the aerosol system under the diffusion phoresis deposition mode; v Sed It indicates the deposition velocity of the aerosol system on the deposition area corresponding to the gravity sedimentation deposition mode, in m / s; v Difrepresents the deposition velocity of the aerosol system on the deposition area corresponding to the Brownian diffusion deposition mode; v Tph represents the deposition velocity of the aerosol system on the deposition area corresponding to the thermophoretic deposition method; v Dph It represents the deposition velocity of the aerosol system on the deposition area corresponding to the diffusion phoresis deposition mode.

[0065] By transforming expression (12) into a moment equation, we can obtain the first expression (7) above:

[0066]

[0067]

[0068] The inventors of the present application have found that, for the four mechanisms leading to aerosol deposition (gravitational sedimentation, Brownian diffusion, thermophoresis, and diffusophoresis), gravitational sedimentation is related to aerosol density, Brownian diffusion is only related to aerosol volume, and aerosol deposition behaviors caused by thermophoresis and diffusophoresis are not related to aerosol properties. Therefore, the following embodiments will describe in detail the two deposition methods of aerosol gravitational sedimentation and Brownian diffusion.

[0069] In some embodiments, in step S3, the deposition method is gravity sedimentation deposition. In the gravity sedimentation deposition method, the deposition rate of all aerosols in the aerosol system 10 and the gas parameters under the predetermined working conditions determined in step S1 and the physical properties of each type of aerosol in the aerosol system 10 satisfy the following second expression (13):

[0070]

[0071] Among them, v Sed represents the deposition velocity of all aerosols in the aerosol system 10 under gravity sedimentation, in m / s; ρ I represents the density of the first aerosol 101, ρ II represents the density of the second aerosol 102; v I represents the volume of the first aerosol 101, v Λ represents the volume of the aerosol system 10; g represents the acceleration due to gravity; C m is the Cunningham slip correction coefficient, which represents the correction coefficient related to gas temperature, pressure and aerosol particle size; η represents the aerodynamic viscosity; χ represents the shape parameter of the aerosol system 10.

[0072] The embodiment of the present application can calculate the deposition rate of the aerosol system 10 under the gravity sedimentation deposition mode relatively accurately and quickly through the above expression (13), and has high reliability and efficiency.

[0073] In some embodiments, Figure 3 is a schematic diagram of aerosol gravity sedimentation according to an embodiment of the present application, such as Figure 3 As shown, if the third aerosol 301 is composed of a single-component aerosol, the deposition rate of the aerosol on the surface of the first thermal member 302 due to gravity sedimentation satisfies the following expression (14):

[0074]

[0075] Among them, v Sed represents the deposition velocity of the third aerosol 301 of a single component under the gravity sedimentation deposition mode, in m / s; ρ p It is expressed as the number density of the third aerosol 301 of the single component, in kg / m 3 ; g represents the acceleration due to gravity, the unit is m / s 2 ;d p represents the diameter of the third aerosol 301 of the single component, in m; C m is the Cunningham slip correction coefficient, which indicates the correction coefficient related to the gas temperature, pressure and aerosol particle size; η indicates the aerodynamic viscosity, in Pa·s; χ indicates the shape parameter of the third aerosol 301 of the single component.

[0076] It can be understood that for an aerosol system composed of aerosol particles of different components, it can be treated as one particle in the aerosol behavior analysis model. Therefore, Figure 3 And the following examples Figure 4 Each aerosol in the system can be regarded as an aerosol system.

[0077] In some embodiments, the aerosol deposition rate caused by gravity settling is related to the aerosol density. For the aerosol system 10 in the embodiment of the present application (it can be understood that in Figure 3 In the above example, the third aerosol 301 can also be regarded as an aerosol system composed of multi-component aerosols. The Taylor expansion moment method model equation of aerosol deposition due to gravity sedimentation can be established, which satisfies the following expression (15):

[0078]

[0079] To facilitate the execution of the Taylor expansion moment method, the above expression (14) can be modified based on expression (11) to obtain the following expression (16):

[0080]

[0081] in,

[0082] In some embodiments, the above second expression (13) can be determined by expression (16).

[0083] In some embodiments, in step S4, the deposition rate, deposition velocity, and air space parameter of the aerosol system 10 satisfy the following third expression (17):

[0084]

[0085] Among them, A Sed represents the deposition area of ​​the aerosol system 10 under gravity sedimentation, where the fractional moment M -1 / 3,1 and M 2 / 3,0 The following expression (18) is satisfied:

[0086]

[0087] in,

[0088] In some embodiments, the third expression (17) can be closed using the first three moments of the deposition system.

[0089] In some embodiments, in step S3, the deposition method is Brownian diffusion deposition. In the Brownian diffusion deposition method, the deposition rate of the aerosol system 10 and the gas parameters under the predetermined working conditions determined in step S1 and the physical properties of each type of aerosol in the aerosol system 10 satisfy the following fourth expression (19):

[0090]

[0091] Among them, v Dif represents the deposition rate of all aerosols in the aerosol system 10 under the Brownian diffusion deposition mode, k B represents the Boltzmann constant, T represents the air space temperature, η represents the aerodynamic viscosity, δ B represents the diffusion boundary layer thickness, χ represents the aerosol shape parameter, v Λ represents the volume of the aerosol system 10, A represents the correction coefficient of the influence of the gas molecule slip effect on the flow, and λ represents the mean free path of the gas molecules.

[0092] The embodiment of the present application can calculate the deposition rate of the aerosol system 10 under the Brownian diffusion deposition mode relatively accurately and quickly through the above expression (19), and has high reliability and efficiency.

[0093] In some embodiments, Figure 4 is a schematic diagram of aerosol Brownian diffusion according to an embodiment of the present application, such as Figure 4As shown, if the fourth aerosol 401 is composed of a single-component aerosol, its deposition rate on the surface of the second thermal member 402 due to Brownian diffusion satisfies the following expression (20):

[0094]

[0095] Among them, v Dif Indicates the Brownian diffusion deposition rate in m / s; k B represents the Boltzmann constant, which is 1.38×10 -23 J / K; T represents the air space temperature, unit is K; δ B Represents the diffusion boundary layer thickness, and its default value is 1×10 -5 m.

[0096] To facilitate the Taylor expansion moment method for expression (20), expression (20) can be modified into the following expression (21):

[0097]

[0098] in,

[0099] In some embodiments, the fourth aerosol 401 is expanded from a single-component aerosol to a two-component aerosol (i.e., the aerosol system 10 of the embodiment of the present application), and the deposition rate, deposition velocity, and air space parameters of the aerosol system 10 satisfy the following fifth expression (22):

[0100]

[0101] Among them, A Dif represents the deposition area of ​​the aerosol system 10 under the Brownian diffusion deposition mode, V represents the aerosol volume, wherein the fractional order moment involved in the Brownian diffusion deposition is and The following expression (23) is satisfied:

[0102]

[0103] In some embodiments, the fifth expression (22) is closed, and the method of closing the fifth expression (22) is similar to that of the third expression (17), which will not be repeated here.

[0104] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0105] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for determining a deposition rate of an aerosol system, the aerosol system comprising a first aerosol and a second aerosol, characterized in that: It includes the following steps: S1. Determine the air space parameters of the aerosol system under predetermined working conditions, the gas parameters under the predetermined working conditions, and the physical property parameters of each type of aerosol in the aerosol system; S2. determining a deposition mode of the aerosol system under the predetermined working condition; S3, determining the deposition rate of all aerosols in the aerosol system according to the deposition mode determined in step S2, the gas parameters under the predetermined working condition determined in step S1, and the physical property parameters of each type of aerosol in the aerosol system; S4, determining the deposition rate of the aerosol system according to the deposition speed determined in step S3 and the air space parameter determined in step S1; The air space parameters include the length, width and height of the air space, the gas parameters include gas humidity and gas temperature, and the physical property parameters include the density and particle size range of the aerosol.

2. The method according to claim 1, characterized in that In step S4, the deposition rate of the aerosol system, the deposition speed, and the air space parameter satisfy the following first expression: Among them, M k,l represents the moment of the deposition system and satisfies the following expression: Wherein, k represents the Taylor expansion order of the aerosol system, k=0, 1, 2, 3…, and k is an integer; l represents the Taylor expansion order of the first aerosol, l=0, 1, 2, 3…, and l is an integer; t represents time; V represents the volume of the air space where the aerosol system is located; A Sed A represents the deposition area of ​​the aerosol system under gravity sedimentation deposition mode; Dif A represents the deposition area of ​​the aerosol system under the Brownian diffusion deposition mode; Tph A represents the deposition area of ​​the aerosol system in the thermophoretic deposition mode; Dph represents the deposition area of ​​the aerosol system in the diffusion phoresis deposition mode; v Sed represents the deposition velocity of the aerosol system on the deposition area corresponding to the gravity sedimentation deposition mode; v Dif represents the deposition velocity of the aerosol system on the deposition area corresponding to the Brownian diffusion deposition mode; v Tph represents the deposition velocity of the aerosol system on the deposition area corresponding to the thermophoretic deposition method; v Dph represents the deposition speed of the aerosol system on the deposition area corresponding to the diffusion phoresis deposition mode; u1 represents the center point of the Taylor expansion of the aerosol system; u2 represents the center point of the Taylor expansion of the first aerosol; M 0,0 、M 1,0 、M 0,1 、M 1,1 、M 2,0 and M 0,2 They represent different initial moments respectively.

3. The method according to claim 2, characterized in that In step S3, the deposition method is gravity sedimentation deposition. In the gravity sedimentation deposition mode, the deposition rate of all aerosols in the aerosol system, the gas parameters under the predetermined working conditions determined in step S1, and the physical properties of each type of aerosol in the aerosol system satisfy the following second expression: Among them, v Sed represents the deposition rate of all aerosols in the aerosol system under the gravity sedimentation deposition mode, ρ I represents the density of the first aerosol, ρ II represents the density of the second aerosol, v I represents the volume of the first aerosol, v Λ represents the volume of the aerosol system, g represents the acceleration due to gravity, C m represents the Cunningham slip correction coefficient, η represents the aerodynamic viscosity, and X represents the shape parameter of the aerosol system.

4. The method according to claim 3, characterized in that In step S4, the deposition rate of the aerosol system, the deposition speed, and the air space parameter satisfy the following third expression: Among them, A Sed represents the deposition area of ​​the aerosol system under the gravity sedimentation, where the fractional moment M ；1 / 3,1 and M 2 / 3,0 Satisfies the following expression: in, 5. The method according to claim 4, characterized in that The third expression is closed.

6. The method according to claim 2, characterized in that In step S3, the deposition method is Brownian diffusion deposition. Under the Brownian diffusion deposition method, the deposition rate of all aerosols in the aerosol system, the gas parameters under the predetermined working conditions determined in step S1, and the physical property parameters of each type of aerosol in the aerosol system satisfy the following fourth expression: Among them, v Dif represents the deposition rate of all aerosols in the aerosol system under the Brownian diffusion deposition mode, k B represents the Boltzmann constant, T represents the air space temperature, η represents the aerodynamic viscosity, δ B represents the diffusion boundary layer thickness, χ represents the aerosol shape parameter, v Λ represents the volume of the aerosol system, A represents the correction coefficient of the influence of the gas molecule slip effect on the flow, and λ represents the mean free path of the gas molecules.

7. The method according to claim 6, characterized in that In step S4, the deposition rate of the aerosol system, the deposition speed, and the air space parameter satisfy the following fifth expression: Among them, A Dif represents the deposition area of ​​the aerosol system under the Brownian diffusion deposition mode, V represents the aerosol volume, wherein the fractional order moment involved in the Brownian diffusion deposition is and Satisfies the following expression:

8. The method according to claim 7, characterized in that The fifth expression is closed.

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