CN113294326A - Test method for determining sampling efficiency of aerosol of sampling pipeline - Google Patents
Test method for determining sampling efficiency of aerosol of sampling pipeline Download PDFInfo
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- CN113294326A CN113294326A CN202110471894.2A CN202110471894A CN113294326A CN 113294326 A CN113294326 A CN 113294326A CN 202110471894 A CN202110471894 A CN 202110471894A CN 113294326 A CN113294326 A CN 113294326A
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- 239000000443 aerosol Substances 0.000 title claims abstract description 79
- 238000010998 test method Methods 0.000 title claims abstract description 25
- 239000002245 particle Substances 0.000 claims abstract description 108
- 238000012360 testing method Methods 0.000 claims abstract description 81
- 238000000034 method Methods 0.000 claims abstract description 9
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- 229960000907 methylthioninium chloride Drugs 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
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- 230000015271 coagulation Effects 0.000 claims description 3
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- 239000000243 solution Substances 0.000 description 7
- 238000009792 diffusion process Methods 0.000 description 3
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/123—Fluid connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/16—Filtration; Moisture separation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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Abstract
The invention belongs to the technical field of sampling efficiency tests, and particularly relates to a test method for determining sampling efficiency of aerosol in a sampling pipeline. The invention comprises the following steps: step 1, designing and building a test platform according to a sampling system; step 2, generating particles with the particle size; step 3, setting a flow rate and air pressure test according to the running conditions of the sampling system; step 4, testing the sampling efficiency of each sampling part; step 5, measuring sampling efficiency values of all sampling components; and 6, determining the comprehensive sampling efficiency value of the sampling system. Based on the components and the arrangement of a sampling system actually used on site, the invention simplifies the test process, eliminates uncertain factors in modeling or theoretical calculation and improves the accuracy of obtaining the aerosol sampling efficiency numerical value by building a sampling efficiency test platform in a laboratory.
Description
Technical Field
The invention belongs to the technical field of sampling efficiency tests, and particularly relates to a test method for determining sampling efficiency of aerosol in a sampling pipeline.
Background
Nuclear plant aerosol emission monitoring is an important component in gaseous effluent monitoring to assess the impact on the surrounding environment and residents. In order to obtain an aerosol sample from a discharge system, the sampling is realized through a sampling pipeline, the sampling pipeline is composed of a sampling head, a sampling pipe, an elbow and other components, but the aerosol is influenced by diffusion, migration, gravity and the like in the transmission process, so that the aerosol deposition in the sampling process is caused to be lost, and the deviation between the measured value of the aerosol radioactivity volume activity and the actual volume activity value at the end of the instrument is caused. To eliminate such deviation, the measurement result of the instrument needs to be corrected based on the aerosol sampling efficiency, so the aerosol sampling efficiency of the acquisition system is crucial, and the aerosol sampling efficiency is defined as the ratio of the number of aerosols at the measurement end to the number of aerosols at the sampling inlet end. The sampling efficiency of aerosol in the existing sampling system is limited and influenced by environment and process conditions, and sampling efficiency test and verification cannot be carried out on site, so modeling simulation can be carried out only through calculation software or calculation and evaluation can be carried out on the basis of the assumption of ideal conditions, but the sampling system is influenced by uncertain factors such as component materials, irregular structures, size processing precision, internal smoothness and the like, so that the aerosol sampling efficiency value of software modeling or theoretical calculation and the actual efficiency value can generate larger deviation.
Disclosure of Invention
The invention aims to provide a test method for determining sampling efficiency of aerosol of a sampling pipeline aiming at the defects of the prior art, and the test method is based on sampling system components and arrangement actually used on site, simplifies the test process, eliminates uncertain factors in modeling or theoretical calculation and improves the accuracy of obtaining the numerical value of the sampling efficiency of the aerosol by building a sampling efficiency test platform in a laboratory.
The technical scheme adopted by the invention is as follows:
a test method for determining sampling efficiency of an aerosol sample in a sampling line, comprising the steps of: step 1, designing and building a test platform according to a sampling system; step 2, generating particles with the particle size; step 3, setting a flow rate and air pressure test according to the running conditions of the sampling system; step 4, testing the sampling efficiency of each sampling part; step 5, measuring sampling efficiency values of all sampling components; and 6, determining the comprehensive sampling efficiency value of the sampling system.
In the step 1, according to the design of the sampling system of the nuclear facility, all sampling components in the sampling system are listed from the sampling head to the collecting and measuring end, specific technical data including spatial arrangement, length and angle of a pipeline are listed, and a test platform of the sampling components is established according to the collected technical data.
The test platform comprises a test sampling component, a diffusion chamber, a sampling system air pump, a sampling system pressure gauge, a sampling system flow meter, a flow regulating valve and a pressure regulating valve, wherein the test sampling component is connected with the test sampling component inlet adapter and the test sampling component outlet adapter respectively, the diffusion chamber is connected with the test sampling component inlet adapter through a pipeline, the test sampling component outlet adapter is connected with the aerosol high-efficiency filter through a pipeline, the aerosol high-efficiency filter is connected with the sampling system air pump through a pipeline and the rear end, the pipeline is connected with the sampling system air pump through the aerosol high-efficiency filter, the sampling system pressure gauge and the sampling system flow meter are arranged, the flow regulating valve and the pressure regulating valve are arranged, and the pressure regulating valve is communicated with the atmosphere.
A standard particle generator is also included for generating aerosol particles of a desired test particle size.
In the step 2, the particles are generated by a standard particle generator, the standard particle generator and the particle dispersion chamber are connected by a pipeline, and the pipeline is polished on the inner wall.
The particle generation raw material is methylene blue, and the particle size is adjusted and controlled by the concentration of methylene blue solution and the working parameters of a standard particle generator.
The standard particle generator is equipped with an electrostatic neutralizer, and the particles generated are uncharged particles.
When the standard particle generator works normally, the number concentration of output particles is controlled to be 35-40 amounts/cm3The range eliminates the possibility of coagulation due to an excessively high particle number concentration.
In the step 3, the sampling system air pump and the standard particle generator are started during working, the flow regulating valve and the pressure regulating valve are regulated, so that the testing pressure and the flow are the same as the flow and the pressure of the actual operation on site, the testing flow and the pressure are measured by the sampling system pressure gauge and the sampling system flow meter, aerosol particles with the particle size required by the test are generated according to the standard particle generator and enter the particle dispersion chamber, and uniform dispersion aerosol space is generated.
In the step 5, the air pump and the standard particle generator of the sampling system are stopped, all sections of test pipelines between the particle dispersion chamber and the aerosol high-efficiency filter are disassembled, the inlet adaptive connector of the tested sampling component, the outlet adapter of the tested sampling component and the aerosol high-efficiency filter are used, the pipelines and all parts are washed section by using quantitative high-purity alcohol, the filter paper arranged in the aerosol high-efficiency filter is soaked and washed by the quantitative alcohol to dissolve the deposited aerosol particles, the solution concentration of all sections of the washing liquid and the filter paper soaking liquid is measured by adopting a spectrophotometer, and the solution concentration is multiplied by the volume of the corresponding washing liquid or the soaking liquid, so that the corresponding test particle mass number can be obtained, and the sampling efficiency of the test component can be expressed as:
M1the mass number of the particles measured by a spectrophotometer is used for a tested sampling part;
M1(total)the total mass number of particles in each section of washing liquid and filter paper soaking liquid;
P1the sampling efficiency of the test particle is determined for the part to be tested.
In step 6, the sampling efficiency of the whole sampling system is:
Ptotalthe overall sampling efficiency of the sampling system for multiple pipe sections and components;
P1～Pithe sampling efficiency of each tested sampling component from 1 st to ith;
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides a test method for determining sampling efficiency of aerosol of a sampling pipeline, which can eliminate the influence limited by field process conditions and environmental conditions and improve the accuracy of the value of the sampling efficiency of the aerosol:
(2) the invention provides a test method for determining sampling efficiency of aerosol of a sampling pipeline, which eliminates the influence of uncertain factors in software and theoretical calculation processes by testing an actual sampling part in a laboratory;
(3) the invention provides a test method for determining sampling efficiency of aerosol in a sampling pipeline, which simplifies the test process and improves the test efficiency;
(4) the invention provides a test method for determining the sampling efficiency of aerosol in a sampling pipeline, which greatly saves the test cost;
(5) the invention provides a test method for determining sampling efficiency of aerosol in a sampling pipeline, and the design improvement of an actual sampling system can be carried out in time through the feedback of a test result.
Drawings
FIG. 1: the invention provides a flow chart of a test method for determining sampling efficiency of aerosol in a sampling pipeline;
FIG. 2: the invention provides a structural schematic diagram of a test system for determining sampling efficiency of aerosol in a sampling pipeline;
in the figure: 1. a standard particle generator; 2. a particle dispersion chamber; 3. the inlet of the tested sampling component is matched with the connecting piece; 4. a sample under test member; 5. the outlet of the tested sampling component is matched with the connecting piece; 6. an aerosol high-efficiency filter; 7. a sampling system pressure gauge; 8. a sampling system flow meter; 9. a flow regulating valve; 10. a pressure regulating valve; 11. a sampling system air pump;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present invention provides a testing method for determining sampling efficiency of aerosol in a sampling line, comprising the steps of:
According to the design of the nuclear facility sampling system, all sampling components in the sampling system are listed from a sampling head to a collecting and measuring end, specific technical data including spatial arrangement, length and angle of a pipeline are listed, and a test platform of the sampling components is established according to the collected technical data and the figure 2. The particle dispersion chamber 2 is used to establish the same conditions as the in situ sampling system. A test platform as shown in fig. 2 was constructed, in which: the dispersion chamber 2 is connected to the inlet adapter 3 of the sample part to be tested via a line. The outlet adapter 5 of the tested sampling component is connected with the aerosol high-efficiency filter 6 through a pipeline. The part 4 to be tested is connected to the inlet adapter 3 and the outlet adapter 5, respectively. The aerosol high-efficiency filter 6 is connected with a rear-end sampling system air suction pump 11 through a pipeline. On the pipeline that aerosol high efficiency filter 6 and sampling system aspiration pump 11 link to each other, set up sampling system manometer 7 and sampling system flowmeter 8 and flow control valve 9 and pressure regulating valve 10, pressure regulating valve 10 and atmosphere UNICOM.
The standard particle generator 1 is used for generating aerosol particles with required test particle sizes, methylene blue can be used as a reagent for the standard generator, the standard particle generator 1 is connected with the particle dispersion chamber 2 through a pipeline, the pipeline is polished on the inner wall, and the standard particle generator 1 is not connected to a sampling platform temporarily before a production rate test is improved.
Step 2. ion generator generates particles in accordance with particle size
The standard particle generator 1 is used for generating particles, methylene blue is selected as a raw material of the generated particles, and the particle size can be adjusted and controlled through the concentration of methylene blue solution and relevant working parameters (vibration frequency, injection speed and the like) of the standard particle generator 1. To accurately determine the size of the particles produced, the particles produced were sampled and measured under a high power microscope. The standard particle generator 1 is equipped with an electrostatic neutralizer and the particles generated are uncharged particles. When the standard particle generator 1 works normally, the output particle number concentration is controlled to be (35-40) amounts/cm3The range eliminates the possibility of coagulation due to an excessively high particle number concentration. The standard particles generated by the standard particle generator 1 should meet the requirement of monodispersity.
And starting the air pump, adjusting the flow and pressure adjusting valve, and preparing the built pipeline to carry out a sampling test according to the flow and air pressure required by the test. During operation, the sampling system air pump 11 and the standard particle generator 1 are started, the flow regulating valve 9 and the pressure regulating valve 10 are regulated, so that the test pressure and the flow are the same as the flow and the pressure of the actual operation on site, and the test flow and the pressure are measured by the sampling system pressure gauge 7 and the sampling system flowmeter 8. The standard particle generator 1 produces aerosol particles of the desired particle size for the test and enters the particle dispersion chamber 2, creating a uniform dispersed aerosol space. Because the sampling system air pump 11 generates negative pressure when working, the aerosol in the particle dispersion chamber 2 respectively passes through the sampling pipeline, the inlet adaptive connector 3 of the tested sampling component, the tested sampling component 4, the outlet adapter 5 of the tested sampling component, the sampling pipeline and the aerosol high-efficiency filter 6, and deposits appear in the components or is filtered and collected.
After confirming that the generated standard particles meet the requirements, the standard particle generator 1 is connected to a sampling system test platform. To improve the accuracy of the test and analytical measurements, the sampling time should be as long as possible. According to the comparative analysis of the test data, the test sampling time of large particle size is generally within 1 hour according to the sampling flow rate, the pipeline specification and the like. For small particle testing, the sampling time is not less than 8 hours. And after enough sampling test time, the sampling pump is turned off, and the sampling efficiency test of the sampling part is finished.
After the test time is satisfied, the sampling system suction pump 11 and the standard particle generator 1 are stopped. And disassembling all sections of test pipelines, the inlet adapting connecting piece 3 of the tested sampling part, the tested sampling part 4, the outlet adapting piece 5 of the tested sampling part and the aerosol high-efficiency filter 6 between the particle dispersion chamber 2 and the aerosol high-efficiency filter 6, flushing the pipelines and all parts by sections by using quantitative high-purity alcohol, and soaking and washing the filter paper arranged in the aerosol high-efficiency filter 6 by using the quantitative alcohol to dissolve and deposit aerosol particles. And measuring the solution concentration of each section of washing liquid and filter paper soaking liquid by using a spectrophotometer. And multiplying the solution concentration by the volume of the corresponding washing liquid or soaking liquid to obtain the corresponding test particle mass number. The sampling efficiency of the test part can be expressed as:
M1the mass number of particles measured by a spectrophotometer for the tested sampling part 4;
M1(total)the total mass number of particles in each section of washing liquid and filter paper soaking liquid (a tested sampling part 4, an aerosol high-efficiency filter 6, a pipeline and a connecting piece between the two parts);
P1sampling efficiency for corresponding test particles to a part to be tested
The total penetration coefficient of the multi-component sampling system can be obtained by testing and measuring the corresponding sampling efficiency P of each component under the same test condition and operation conditiontotal. Finally, the sampling efficiency of the whole sampling system is determined as follows:
Ptotalthe overall sampling efficiency of the sampling system for multiple pipe sections and components;
P1～Pithe sampling efficiency of each tested sampling component from 1 st to ith;
in order to determine the efficiency of the chimney aerosol sampling system, based on the sampling system components and arrangement actually used on site, the sampling efficiency test platform of the sampling equipment is set up in a laboratory, based on the test method, the test process is simplified, the deviation of software modeling simulation and theoretical calculation is eliminated, and the accuracy of obtaining the aerosol sampling efficiency value is effectively improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (11)
1. A test method for determining sampling efficiency of an aerosol sample in a sampling line, comprising: the method comprises the following steps: step (1), designing and building a test platform according to a sampling system; step (2), particles with the particle size are generated; step (3), setting a flow rate and air pressure test according to the running conditions of the sampling system; step (4), testing the sampling efficiency of each sampling component; step (5), measuring sampling efficiency values of each sampling component; and (6) determining the comprehensive sampling efficiency value of the sampling system.
2. A test method for determining sampling efficiency of a sampling line aerosol as claimed in claim 1, characterized in that: in the step (1), according to the design of the sampling system of the nuclear facility, listing all sampling components in the sampling system from the sampling head to the collecting and measuring end, listing specific technical data including spatial arrangement, length and angle of a pipeline, and establishing a test platform of the sampling components according to the collected technical data.
3. A test method for determining sampling efficiency of a sampling line aerosol as claimed in claim 2, characterized in that: the test platform includes, by experimental sampling part (4) respectively with by experimental sampling part entry adaptation connecting piece (3) and by experimental sampling part export adapter (5) continuous, disperse room (2) pass through the pipeline and by experimental sampling part entry adapter (3) continuous, by experimental sampling part export adapter (5) pass through the pipeline and link to each other with aerosol high efficiency filter (6), aerosol high efficiency filter (6) pass through pipeline and rear end sampling system aspiration pump (11) link to each other, on the pipeline that aerosol high efficiency filter (6) and sampling system aspiration pump (11) link to each other, sampling system manometer (7) and sampling system flowmeter (8) and flow control valve (9) and pressure regulating valve (10) have been set up, pressure regulating valve (10) and atmosphere UNICOM.
4. A test method for determining sampling efficiency of a sampling line aerosol as claimed in claim 3, characterized in that: the aerosol particle analyzer further comprises a standard particle generator (1), wherein the standard particle generator (1) is used for generating aerosol particles with required test particle sizes.
5. A test method for determining sampling efficiency of a sampling line aerosol as claimed in claim 4, characterised in that: in the step (2), the standard particle generator (1) is used for generating particles, the standard particle generator (1) and the particle dispersion chamber (2) are connected through a pipeline, and the pipeline is polished on the inner wall.
6. A test method for determining sampling efficiency of a sampling line aerosol as claimed in claim 5, characterised in that: the generation particle raw material is methylene blue, and the particle size is adjusted and controlled by the concentration of methylene blue solution and the working parameters of a standard particle generator (1).
7. A test method for determining sampling efficiency of a sampling line aerosol as claimed in claim 6, characterised in that: the standard particle generator (1) is equipped with an electrostatic neutralizer, and the generated particles are uncharged particles.
8. A test method for determining sampling efficiency of a sampling line aerosol as claimed in claim 7, characterised in that: when the standard particle generator (1) works normally, the number concentration of output particles is controlled to be 35-40 amounts/cm3The range eliminates the possibility of coagulation due to an excessively high particle number concentration.
9. A test method for determining sampling efficiency of a sampling line aerosol as claimed in claim 8, characterized in that: in the step (3), a sampling system air pump (11) and a standard particle generator (1) are started during working, the flow regulating valve (9) and the pressure regulating valve (10) are regulated, so that the test pressure and the flow are the same as the flow and the pressure of actual operation on site, the test flow and the pressure are measured through a sampling system pressure gauge (7) and a sampling system flowmeter (8), aerosol particles with the particle size required by the test are generated according to the standard particle generator (1) and enter a particle dispersion chamber (2), and uniform dispersion aerosol space is generated, and as the sampling system air pump (11) generates negative pressure during working, the aerosol in the particle dispersion chamber (2) respectively passes through a sampling pipeline, a tested sampling component inlet adaptive connector (3), a tested sampling component (4), a tested sampling component outlet adapter (5), a sampling pipeline and an aerosol high-efficiency filter (6), and is deposited or filtered and collected in the components .
10. A test method for determining sampling efficiency of a sampling line aerosol as claimed in claim 9, characterized in that: in the step (5), the air pump (11) and the standard particle generator (1) of the sampling system are stopped, all sections of test pipelines between the particle dispersion chamber (2) and the aerosol high-efficiency filter (6) are disassembled, the test sampling part inlet adaptive connecting piece (3), the test sampling part (4), the test sampling part outlet adapter (5) and the aerosol high-efficiency filter (6) are adopted, the pipeline and all the parts are washed section by using quantitative high-purity alcohol, the filter paper installed in the aerosol high-efficiency filter (6) is soaked, washed, dissolved and deposited aerosol particles by using the quantitative alcohol, the solution concentration of all sections of the washing liquid and the filter paper soaking liquid is measured by using a spectrophotometer, the solution concentration is multiplied by the volume of the corresponding washing liquid or the soaking liquid, the corresponding test particle mass number can be obtained, and the sampling efficiency of the test part can be expressed as:
M1the mass number of the particles measured by a spectrophotometer is used for the tested sampling part (4);
M1(total)the total mass number of particles in each section of washing liquid and filter paper soaking liquid;
P1the sampling efficiency of the test particle is determined for the part to be tested.
11. A test method for determining sampling efficiency of a sampling line aerosol as claimed in claim 10, characterised in that: in the step (6), the sampling efficiency of the whole sampling system is as follows:
Ptotalthe overall sampling efficiency of the sampling system for multiple pipe sections and components;
P1～Pithe sampling efficiency of each tested sampling component from 1 st to ith;
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