CN114923828A - Sampler collection efficiency evaluation device and method based on static box method - Google Patents
Sampler collection efficiency evaluation device and method based on static box method Download PDFInfo
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- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- 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
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- 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
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Abstract
The invention discloses a sampler collection efficiency evaluation device and method based on a static box method. The sampler collection efficiency evaluation device based on the static box method comprises a plurality of atomized aerosol generators; the mixing cabin is communicated with the atomized aerosol generator and is communicated with a dilution air source; the test bin is communicated with the blending cabin, and a tested sampler and a reference pipeline are detachably arranged in the test bin; the analysis cabin is provided with an aerosol diluter and an aerosol particle size spectrometer, and the tested sampler and the reference pipeline are communicated with the input end of the aerosol diluter. The sampler collection efficiency evaluation device based on the static box method is suitable for evaluating the collection efficiency of various samplers; the aerosol of multiple different particle diameters can be produced, the particle concentration in the atmospheric environment is simulated more truly, the error existing in the laboratory detection effect and the actual atmospheric environment is reduced, and the reliability of the sampler collection efficiency evaluation result is improved.
Description
Technical Field
The invention relates to the technical field of sampler collection efficiency evaluation, in particular to a sampler collection efficiency evaluation device and method based on a static box method.
Background
Aerosols are gas dispersions formed by suspending solid or liquid particles in a gas, bioaerosols refer to the collection of biological particles including pollen, bacterial fungal viruses, and gaseous media suspended in a gas, these particles varying in size from viruses less than 0.1 micron in diameter to fungal spores 100 microns or larger in diameter, which may occur as single unattached organisms or aggregates. The bioaerosols can introduce pathogenic microorganisms into the human body through respiration, causing health hazards. In the recent years, public health safety is receiving more and more social attention, and for public environments (such as stations, airports, communities and other dense places), microorganisms in aerosol are the fierce of spreading viruses and causing health problems, and how to effectively collect the microorganisms in the aerosol and fully know the concentration, species and other conditions is one of the key problems of public health field research.
In order to observe the aerosol in the air, it needs to be sampled. The aerosol sampler can be divided into two categories, namely an environment monitoring field and a biological safety field according to different use fields, wherein the sampler in the environment monitoring field comprises a front-end cutter of a dust concentration measuring instrument, a respiratory dust sampling head, a multi-stage impact sampler and the like, and the sampler in the biological safety field comprises a solid impact type sampler, a liquid impact type sampler, a filter membrane sampling sampler, an electrostatic sampler and the like. Along with the popularization and the use of the aerosol sampler, the specification and the unification of technical parameters of the aerosol sampler and the calibration and the tracing of all indexes become more important, wherein the physical efficiency of the sampler is an important index for evaluating the sampling effectiveness of the sampler and is also a neck problem of a domestic instrument at present.
The existing sampler collection efficiency evaluation device can only enable monodisperse standard substances to enter a detector independently, and a real atmospheric environment generally has particles with various sizes and shapes, so that gas collected by the sampler collection efficiency evaluation device cannot simulate the real atmospheric environment, and the reliability of a sampler collection efficiency evaluation result is reduced.
Therefore, how to improve the reliability of the evaluation result of the sampling efficiency of the sampler is a technical problem that needs to be solved by those skilled in the art at present.
Disclosure of Invention
In view of this, the present invention provides a sampler collection efficiency evaluation apparatus to improve reliability of a sampler collection efficiency evaluation result.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a sample thief collection efficiency evaluation device based on static case method, includes:
a plurality of atomized aerosol generators capable of being communicated with a generated air source so as to respectively load monodisperse particle solutions with different particle diameters into the plurality of atomized aerosol generators;
the blending cabin is communicated with the output end of the atomized aerosol generator, and the input end of the blending cabin can be communicated with a dilution air source;
the test bin is communicated with the output end of the blending cabin, and a tested sampler and a reference pipeline are detachably mounted in the test bin;
the analysis cabin is provided with an aerosol diluter and an aerosol particle size spectrometer, the detected sampler and the reference pipeline are communicated with the input end of the aerosol diluter, a first electromagnetic valve is arranged between the detected sampler and the aerosol diluter, and a second electromagnetic valve is arranged between the reference pipeline and the aerosol diluter.
Preferably, the sampler collection efficiency evaluation device based on the static box method further comprises a control cabin;
the control cabin is internally provided with a first mass flow controller and a second mass flow controller, the first mass flow controller can be communicated with the generated air source, the second mass flow controller can be communicated with the diluted air source, the output end of the first mass flow controller is communicated with the input end of the atomized aerosol generator, and the output end of the second mass flow controller is communicated with the blending cabin.
Preferably, in the sampler collection efficiency evaluation device based on the static box method, a multi-way valve is further disposed in the control cabin, and the multi-way valve is disposed between the first mass flow controller and the aerosol generator.
Preferably, in the sampler collection efficiency evaluation device based on the static box method, a third mass flow controller is further disposed in the control cabin, the sampler collection efficiency evaluation device further includes an air suction pump, one end of the third mass flow controller is communicated with an upstream pipeline of the aerosol diluter, and the other end of the third mass flow controller is communicated with the air suction pump.
Preferably, in the sampler collection efficiency evaluation device based on the static box method, the control cabin is further provided with a control panel, and the first mass flow controller, the second mass flow controller, the multi-way valve, the third mass flow controller and the aerosol particle size spectrometer are all electrically connected to the control panel.
Preferably, in the sampler collection efficiency evaluation device based on the static box method, the sampler collection efficiency evaluation device further comprises an air source device, and an output end of the air source device is respectively communicated with the atomized aerosol generator and the mixing chamber.
Preferably, in the sampler collection efficiency evaluation device based on the static tank method, the aerosol generator is composed of a thin tube with venturi effect and siphon effect.
Preferably, in the sampler collection efficiency evaluation device based on the static box method, the blending chamber adopts a venturi structure capable of improving the uniformity of aerosol.
Preferably, in the sampler collection efficiency evaluation device based on the static box method, the sampler to be tested is a PM2.5 cutter.
A sampler collection efficiency evaluation method applies the sampler collection efficiency evaluation device based on the static box method, and comprises the following steps:
s1: respectively filling the monodisperse particle solutions with different particle diameters into a plurality of atomization aerosol generators;
s2: one of the plurality of atomized aerosol generators is communicated with a generating air source to generate aerosol with a preset particle size, the aerosol enters the blending cabin, and meanwhile, the blending cabin is communicated with a diluting air source to dilute the aerosol in the blending cabin;
s3: aerosol particles in the mixing cabin enter a test bin, a first electromagnetic valve is closed, a second electromagnetic valve is opened, so that the aerosol in the test bin enters an aerosol diluter through a reference pipeline, and primary detection is carried out on the concentration of the particles in the test bin through an aerosol particle size spectrometer;
s4: closing the second electromagnetic valve, opening the first electromagnetic valve to enable the aerosol collected by the sampler to be detected to enter the aerosol diluter, and performing secondary detection on the concentration of the particles through the aerosol particle size spectrometer;
s5: repeating steps S2 to S4 until all of the aerosol generators generate aerosol particles of a predetermined size.
Preferably, in the sampler collection efficiency evaluation method, the step S2 includes:
s2-1: controlling the flow rate of the aerosol generated by the atomized aerosol generator into the blending chamber by a first mass flow controller;
s2-1: and controlling the flow rate of the airflow of the dilution air source entering the blending cabin through a second mass flow controller.
Preferably, in the sampler collection efficiency evaluation method, the step S2 further includes:
S2-A1: and opening one passage in the multi-way valve to lead one of the plurality of atomizing aerosol generators to be communicated with the generated gas source.
Preferably, in the sampler collection efficiency evaluation method, before the step S3 and the step S4 are executed, the suction flow rate of the suction pump is controlled by a third mass flow controller.
When the sampler collection efficiency evaluation device based on the static box method is used, the atomized aerosol generator can be communicated with the generated air source, and the output end of the atomized aerosol generator is communicated with the blending cabin, so that aerosol can be generated by the atomized aerosol generator and input into the blending cabin; because the tested sampler and the reference pipeline are both communicated with the input end of the aerosol diluter, a first electromagnetic valve is arranged between the tested sampler and the aerosol diluter, and a second electromagnetic valve is arranged between the reference pipeline and the aerosol diluter, when the collection efficiency of the tested sampler is evaluated, the first electromagnetic valve is closed, the second electromagnetic valve is opened, so that the aerosol in the test bin enters the aerosol diluter through the reference pipeline, and the primary detection is carried out on the concentration of particulate matters in the test bin through an aerosol particle size spectrometer, so as to detect the original concentration and particle size distribution of the aerosol in the test bin; and closing the second electromagnetic valve, opening the first electromagnetic valve, enabling the aerosol collected by the sampler to enter an aerosol diluter in the analysis cabin, carrying out secondary detection on the concentration of the particulate matters through an aerosol particle size spectrometer, and recording and judging the collection efficiency of the sampler to be detected by comparing the two measurement structures. Therefore, the sampler collection efficiency evaluation device based on the static box method can generate a stable aerosol environment, and the sampler to be tested is detachably mounted in the test bin, so that when different types of samplers (such as a dust sampler, a planktonic bacteria sampler or a biological sampler) need to be evaluated, the sampler to be tested only needs to be replaced by the sampler of the corresponding type, namely the sampler collection efficiency evaluation device is suitable for evaluating the collection efficiency of various types of samplers; and because the number of the atomizing aerosol generators is multiple, the multiple atomizing aerosol generators can generate aerosols with different particle sizes, so that aerosol particles with various monodispersities can independently enter the test bin, the sampling device can evaluate the collection efficiency of the aerosol particles with different particle sizes, or mixed aerosol particles with any particle size can enter the test bin, the mixed aerosol particles in the test bin are closer to the actual atmospheric environment, the concentration of particles in the atmospheric environment can be simulated more truly, the error between the laboratory detection effect and the actual atmospheric environment can be reduced, and the reliability of the sampling efficiency evaluation result of the sampling device can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an evaluation apparatus for sampling efficiency of a sampler according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an internal structure of a control cabin according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a sampler collection efficiency evaluation device according to an embodiment of the present invention when generating aerosol with a single particle size;
fig. 4 is a schematic structural diagram of ten aerosol generators arranged in a sampler collection efficiency evaluation device according to an embodiment of the present invention;
fig. 5 is a schematic external structural diagram of an evaluation apparatus for sampling efficiency of a sampler according to an embodiment of the present invention;
fig. 6 is a schematic flowchart of a method for evaluating the sampling efficiency of a sampler according to an embodiment of the present invention.
Wherein 100 is an atomized aerosol generator, 101 is a first atomized aerosol generator, 102 is a second atomized aerosol generator, 103 is a third atomized aerosol generator, 104 is a fourth atomized aerosol generator, 105 is a fifth atomized aerosol generator, 106 is a sixth atomized aerosol generator, 107 is a seventh atomized aerosol generator, 108 is an eighth atomized aerosol generator, 109 is a ninth atomized aerosol generator, 110 is a tenth atomized aerosol generator, 200 is a blending chamber, 300 is a test chamber, 301 is a tested sampler, 302 is a reference pipeline, 400 is an analysis chamber, 401 is an aerosol diluter, 402 is an aerosol particle size spectrometer, 403 is a first electromagnetic valve, 404 is a second electromagnetic valve, 500 is a control chamber, 501 is a first mass flow controller, 502 is a second mass flow controller, 503 is a multi-way valve, and 504 is a third mass flow controller, 505 is a control panel, 600 is a suction pump, and 700 is an air supply device.
Detailed Description
In view of the above, the core of the present invention is to provide a sampler collection efficiency evaluation device based on a static box method, so as to improve the reliability of the sampler collection efficiency evaluation result.
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.
As shown in fig. 1 to 6, the embodiment of the invention discloses a sampler collection efficiency evaluation device based on a static box method, which comprises an atomized aerosol generator 100, a blending chamber 200, a test chamber 300 and an analysis chamber 400.
The number of the atomized aerosol generators 100 is plural, so that monodisperse particles (polystyrene particles of monodisperse standard in the embodiment of the present invention) with different particle sizes are respectively loaded in the plural atomized aerosol generators 100, and the atomized aerosol generators 100 can be communicated with a generating gas source, so that aerosols with different particle sizes are generated by the plural atomized aerosol generators 100, thereby realizing monodispersity and polydispersity of the aerosols; the blending chamber 200 is communicated with the output end of the atomized aerosol generator 100, and the input end of the blending chamber 200 can be communicated with a dilution air source; the test bin 300 is communicated with the output end of the blending chamber 200, and a tested sampler 301 and a reference pipeline 302 are detachably mounted in the test bin 300; the analysis cabin 400 is provided with an aerosol diluter 401 and an aerosol particle size spectrometer 402, the tested sampler 301 and the reference pipeline 302 are both communicated with the input end of the aerosol diluter 401, a first electromagnetic valve 403 is arranged between the tested sampler 301 and the aerosol diluter 401, and a second electromagnetic valve 404 is arranged between the reference pipeline 302 and the aerosol diluter 401.
When the sampler collection efficiency evaluation device based on the static box method is used, as the atomized aerosol generator 100 can be communicated with the generated air source, and the output end of the atomized aerosol generator 100 is communicated with the blending cabin 200, the atomized aerosol generator 100 can generate aerosol and input the generated aerosol into the blending cabin 200, and as the input end of the blending cabin 200 is also communicated with the dilution air source, the aerosol entering the blending cabin 200 can be diluted by introducing the dilution air source into the blending cabin 200, so that the flow can be controlled in multiple aspects and dimensions, the aerosol concentration can be controlled, and as the test cabin 300 is communicated with the output end of the blending cabin 200, the aerosol in the blending cabin 200 can enter the test cabin 300, so that the aerosol in the test cabin 300 has higher stability and uniformity; because the tested sampler 301 and the reference pipeline 302 are both communicated with the input end of the aerosol diluter 401, and a first electromagnetic valve 403 is arranged between the tested sampler 301 and the aerosol diluter 401, and a second electromagnetic valve 404 is arranged between the reference pipeline 302 and the aerosol diluter 401, when the collection efficiency of the tested sampler 301 is evaluated, the first electromagnetic valve 403 is firstly closed, the second electromagnetic valve 404 is opened, so that the aerosol in the test bin 300 enters the aerosol diluter 401 through the reference pipeline 302, and the particle concentration in the test bin 300 is primarily detected through the aerosol particle size spectrometer 402, so as to detect the original aerosol concentration and particle size distribution in the test bin 300; and then closing the second electromagnetic valve 404, opening the first electromagnetic valve 403, enabling the aerosol collected by the sampler 301 to enter the aerosol diluter 401 in the analysis chamber 400, carrying out secondary detection on the concentration of the particulate matters through the aerosol particle size spectrometer 402, and recording and judging the collection efficiency of the sampler 301 to be detected by comparing the two measurement structures. Therefore, the sampler collection efficiency evaluation device based on the static box method can generate a stable aerosol environment, and because the tested sampler 301 is detachably mounted in the test bin 300, when different types of samplers (such as a dust sampler, a planktonic sampler or a biological sampler) need to be evaluated, the tested sampler 301 only needs to be replaced by a corresponding type of sampler, namely the sampler collection efficiency evaluation device is suitable for evaluating the collection efficiency of various types of samplers; and, because the quantity of atomizing aerosol generator 100 is a plurality of, consequently, can produce the aerosol of multiple different particle diameters through a plurality of atomizing aerosol generator 100, realize that the aerosol granule of multiple monodispersity independently gets into test bin 300, accomplish the sample thief and to the collection efficiency evaluation of different particle diameter aerosol granules, perhaps realize getting into test bin 300 with the mixed aerosol granule of arbitrary particle diameter, make the mixed aerosol granule in test bin 300 and actual atmospheric environment more closely, the particulate matter concentration in the more real simulation atmospheric environment, reduce the error that exists in laboratory test effect and the actual atmospheric environment, the reliability of sample thief collection efficiency evaluation result has been promoted.
It should be understood that the sampler 301 to be tested can be any one of a dust sampler, a planktonic bacteria sampler, or a biological sampler, in practical applications, the type of the sampler can be adaptively changed according to actual requirements, and optionally, the sampler 301 to be tested provided by the embodiment of the present invention is a PM2.5 cutter, so as to evaluate the cutting efficiency of the PM2.5 cutter.
In addition, the number of the aerosol generators 100 is not particularly limited, and as long as the number can satisfy the use requirement, the aerosol generators 100 provided in the embodiment of the present invention may be ten, as shown in fig. 4.
Further, the sampler collection efficiency evaluation device based on the static box method further comprises a control cabin 500, a first mass flow controller 501 and a second mass flow controller 502 are arranged in the control cabin 500, the first mass flow controller 501 can be communicated with a generated air source, the second mass flow controller 502 can be communicated with a dilution air source, an output end of the first mass flow controller 501 is communicated with an input end of the aerosol generator 100, an output end of the second mass flow controller 502 is communicated with the blending cabin 200, so that the aerosol generated by the aerosol generator 100 is controlled by the first mass flow controller 501 to enter the airflow flow rate of the blending cabin 200, the airflow flow rate of the dilution air source entering the blending cabin 200 is controlled by the second mass flow controller 502 to form a stable aerosol environment in the blending cabin 200.
In addition, a multi-way valve 503 is further arranged in the control cabin 500, the multi-way valve 503 is arranged between the first mass flow controller 501 and the aerosol generators 100, so that one or more of the aerosol generators 100 can be controlled to be communicated with a generated air source through the multi-way valve 503, polystyrene particles with various monodisperse standards can independently enter the test cabin 300 through respective pipelines through a control panel 505 described below, and mixed aerosol emission of the polystyrene particles with any size standard can be realized through control of the multi-way valve 503, so that not only is monodisperse particle size evaluation met, but also polydisperse particle size evaluation requirements are met, and the diversity and the scientificity of evaluation modes are improved.
It should be understood that the multi-way valve 503 may be any type such as a four-way valve, an eight-way valve, or a ten-way valve, and the type is within the scope of the present invention as long as the type can meet the use requirement; optionally, the multi-way valve 503 provided by the embodiment of the present invention is a ten-way valve.
As shown in fig. 2, a third mass flow controller 504 is further disposed in the control cabin 500, the sampler collection efficiency evaluation apparatus further includes an air pump 600, one end of the third mass flow controller 504 is communicated with an upstream pipeline of the aerosol diluter 401, and the other end of the third mass flow controller 504 is communicated with the air pump 600, so as to control the air pump 600 to pump air to the upstream pipeline of the aerosol diluter 401, and control the air pumping flow through the third mass flow controller 504, so that the sum of the air pumping flow of the air pump 600 and the air pumping flow of the aerosol particle size spectrometer 402 meets the working flow requirement of the sampler 301 to be measured.
The upstream line of aerosol diluter 401 described herein refers to a line that flows through aerosol diluter 401 before flowing through it.
Furthermore, the control cabin 500 is further provided with a control panel 505, and the first mass flow controller 501, the second mass flow controller 502, the multi-way valve 503, the third mass flow controller 504 and the aerosol particle size spectrometer 402 are all electrically connected with the control panel 505, so as to control the airflow flow rates of the first mass flow controller 501, the second mass flow controller 502 and the third mass flow controller 504 through the control panel 505, control the opening and closing of the multi-way valve 503, and display the detection result of the aerosol particle size spectrometer 402 on the control panel 505, so that a worker can read the detection result, and can monitor the aerosol concentration, the particle residue in the passage and the particle size distribution through the aerosol particle size spectrometer 402, thereby improving the aerosol concentration and particle size control capability, and the monitoring capability of the cleaning degree of the pipeline, so as to realize timely purging, the detection efficiency is improved, and the error is reduced.
Meanwhile, the control panel can display the running state of the sampler collection efficiency evaluation device and the analysis result of the aerosol particle size spectrometer 402 in real time, a visual operation mode and a monitoring mechanism capable of reporting errors in time are achieved, automation of the whole device is achieved through the automatic control multi-way valve 503, the first mass flow controller 501, the second mass flow controller 502 and the like, controllability and accuracy of the whole device are improved, efficiency is improved, and the sampler collection efficiency evaluation device is convenient and fast.
It should be noted that the generated gas source and the dilution gas source may be the same gas source, or may not be the same gas source, as long as the use requirements can be met; optionally, the generated air source and the diluted air source provided by the embodiment of the present invention are both generated by an air source device 700, and output ends of the air source device 700 are respectively communicated with the atomized aerosol generator 100 and the blending chamber 200, so that a part of the air source generated by the air source device 700 is introduced into the atomized aerosol generator 100 to serve as the generated air source, and another part of the air source is introduced into the blending chamber 200 to serve as the diluted air source.
The atomization aerosol generator 100 provided by the invention is composed of a thin tube with a venturi effect and a siphon effect, so that the generation concentration of aerosol is adjusted by controlling the size of air flow.
In addition, the blending chamber 200 adopts a venturi structure to improve the uniformity of aerosol in the blending chamber 200.
In one embodiment of the present invention, taking the PM2.5 evaluation of the cyclone efficiency as an example, the number of aerosol generators 100 is ten, namely a first aerosol atomizer 101, a second aerosol atomizer 102, a third aerosol atomizer 103, a fourth aerosol atomizer 104, a fifth aerosol atomizer 105, a sixth aerosol atomizer 106, a seventh aerosol atomizer 107, an eighth aerosol atomizer 108, a ninth aerosol atomizer 109 and a tenth aerosol atomizer 110, the first atomized aerosol generator 101 to the eighth atomized aerosol generator 108 were filled with monodisperse standard polystyrene particle solutions of 1.5. + -. 0.25. mu.m, 2.0. + -. 0.25. mu.m, 2.2. + -. 0.25. mu.m, 2.5. + -. 0.25. mu.m, 2.8. + -. 0.25. mu.m, 3.0. + -. 0.25. mu.m, 3.5. + -. 0.25. mu.m, and 4.0. + -. 0.25. mu.m, respectively. Then, the air source device 700 is communicated with the input end of the first mass flow controller 501, the output end of the first mass flow controller 501 is communicated with the input end of a multi-way valve 503 (here, a ten-way valve), the output end of the multi-way valve 503 is communicated with the input end of the aerosol generator 100, and the output end of the aerosol generator 100 is communicated with the input end of the blending chamber 200; the air source device 700 is communicated with the input end of the second mass flow controller 502, the output end of the second mass flow controller 502 is communicated with the input end of the blending chamber 200, and the aerosol generated by the atomized aerosol generator 100 is diluted in the blending chamber 200.
Further, the blending chamber 200 is communicated with the test chamber 300, the tested sampler 301 and the reference pipeline 302 in the test chamber 300 are respectively communicated with an aerosol diluter 401 through a first electromagnetic valve 403 and a second electromagnetic valve 404, and the aerosol diluter 401 is communicated with an aerosol particle size spectrometer 402; the upstream pipeline of the aerosol diluter 401 is communicated with the input end of the third mass flow controller 504, and the output end of the third mass flow controller 504 is communicated with the air pump 600, so that the air pumping flow is adjusted to enable the sum of the air pumping flow of the air pump 600 and the air pumping flow of the aerosol particle size spectrometer 402 to meet the working flow (16.7L/min) of the PM2.5 cutter.
During primary detection, a first passage of the multi-way valve 503 is opened through the control panel 505, as shown in fig. 2, polystyrene pellets with a standard particle size of 1.5 ± 0.25 μm enter the blending chamber 200, the second electromagnetic valve 404 in the analysis chamber 400 is opened, the first electromagnetic valve 403 is closed, the test chamber 300 and the aerosol diluter 401 are communicated through the reference pipeline 302, the aerosol diluter 401 and the aerosol particle size spectrometer 402 in the analysis chamber 400 have pneumatic dilution function and analysis function respectively, and analysis results are displayed on the control panel 505 of the controller; then, performing secondary detection, wherein a first electromagnetic valve 403 in the analysis cabin 400 is opened, a second electromagnetic valve 404 is closed, so that the analysis cabin 400 is communicated with a PM2.5 cutter, the aerosol cut by the PM2.5 cutter enters an aerosol diluter 401 and an aerosol particle size spectrometer 402 in the analysis cabin 400, the aerosol diluter 401 and the aerosol particle size spectrometer 402 respectively start dilution and analysis, and an analysis result is displayed on a control panel 505; through comparing the two measurement results, the cutting condition of the PM2.5 cutter is judged and recorded, and the public pipeline is purged after the sampling efficiency of the sampler with the single size is measured.
After the sampling efficiency measurement of the sampler with a single size is completed, the passage to which the particles with the previous size belong is closed through the control panel 505, the passage to which the particles with the next size belong is connected, so that the standard polystyrene particles with the corresponding size enter the blending chamber 200 and the test chamber 300, the aerosol particle size spectrometer 402 in the analysis chamber 400 sequentially detects the concentration of the particles according to the sequence of firstly measuring the reference pipeline 302 and then measuring the PM2.5 cutter, and the analysis result is displayed on the control panel 505; judging and recording the cutting condition of the PM2.5 cutter by comparing the two measurement results, so that the acquisition efficiency measurement of another sampler with a single size is completed, and a public pipeline is purged; the above steps are repeated until all particle size passages undergo the steps of turning on and off, thereby completing the evaluation of the cutting efficiency of the different particle size PM2.5 cutter.
In addition, the invention also discloses a sampler collection efficiency evaluation method, which applies the sampler collection efficiency evaluation device based on the static box method and comprises the following steps:
s1: monodisperse particle solutions of different particle sizes are loaded into a plurality of aerosol generators 100, respectively, to facilitate monodisperse and polydispersion of the aerosol.
S2: one of the plurality of atomized aerosol generators 100 is conducted with the generating air source to generate aerosol with a preset particle size, the aerosol enters the blending chamber 200, and meanwhile, the blending chamber 200 is conducted with the diluting air source to dilute the aerosol in the blending chamber 200, so that the sampling efficiency of the sampler 301 to be detected on the aerosol with the preset particle size is detected.
S3: aerosol particles in the blending chamber 200 enter the test chamber 300, the first electromagnetic valve 403 is closed, and the second electromagnetic valve 404 is opened, so that the aerosol in the test chamber 300 enters the aerosol diluter 401 through the reference pipeline 302, and the concentration of the particles in the test chamber 300 is primarily detected through the aerosol particle size spectrometer 402, so that the concentration and the particle size distribution of the original aerosol in the test chamber 300 can be detected conveniently.
S4: the second electromagnetic valve 404 is closed, the first electromagnetic valve 403 is opened, so that the aerosol collected by the sampler 301 to be tested enters the aerosol diluter 401, the particle concentration is detected for the second time through the aerosol particle size spectrometer 402, so that the concentration and the particle size distribution of the aerosol collected by the sampler 301 to be tested are detected, and after the two measurement results are compared, the collection efficiency of the sampler 301 to be tested is recorded and judged.
S5: and repeating the steps S2 to S4 until all the atomization aerosol generators 100 generate aerosol particles with preset particle sizes, so as to complete the collection efficiency evaluation of the tested samplers 301 with different particle sizes.
Therefore, the sampler collection efficiency evaluation method provided by the invention can generate a stable aerosol environment, can generate a plurality of aerosols with different particle sizes through the plurality of aerosol generators 100, realizes that a plurality of monodisperse aerosol particles independently enter the test bin 300, completes the evaluation of the collection efficiency of the sampler on the aerosol particles with different particle sizes, or realizes that mixed aerosol particles with any particle size enter the test bin 300, so that the mixed aerosol particles in the test bin 300 are closer to the actual atmospheric environment, more truly simulates the concentration of particles in the atmospheric environment, reduces the error between the laboratory detection effect and the actual atmospheric environment, and improves the reliability of the sampler collection efficiency evaluation result.
After the step S4 is finished, and before the step S5 is started, that is, after the sampling efficiency evaluation test of the sampler on the single-size aerosol is finished, the common pipeline needs to be purged by the air source, so as to prevent the accuracy of the subsequent detection from being affected.
In addition, because the sampler 301 to be tested is detachably mounted inside the test chamber 300, the sampler collection efficiency evaluation method is a static box method-based sampler collection efficiency evaluation method, the dust environment is stable, and the method is suitable for various types of samplers such as dust samplers, planktonic bacteria samplers, biological samplers and the like, in practical application, the types of samplers can be adaptively changed according to practical requirements, and optionally, the sampler 301 to be tested provided by the embodiment of the invention is a PM2.5 cutter so as to evaluate the cutting efficiency of the PM2.5 cutter.
Furthermore, the number of the aerosol generators 100 is not particularly limited, and as long as the number of the aerosol generators is enough to meet the use requirement, the aerosol generators 100 provided in the embodiment of the present invention are optionally ten.
Further, the step S2 includes:
s2-1: the airflow velocity of the aerosol in the atomized aerosol generator 100 entering the blending chamber 200 is controlled by the first mass flow controller 501, so that the aerosol entering the blending chamber 200 has a stable flow velocity.
S2-1: the flow rate of the dilution air into the blending compartment 200 is controlled by the second mass flow controller 502 to form a stable aerosol environment in the blending compartment 200.
In addition, the step S2 further includes, before the step S2-1:
S2-A1: one of the passages in the multi-way valve 503 is opened to communicate one of the plurality of aerosol generators 100 with the source of the generated gas.
In addition, before the sampler collection efficiency evaluation method executes the steps S3 and S4, the extraction flow rate of the extraction pump 600 is controlled by the third mass flow controller 504, so that the sum of the extraction flow rate of the extraction pump 600 and the extraction flow rate of the aerosol particle size spectrometer 402 meets the working flow requirement of the sampler 301 to be tested.
It should be understood that the above-mentioned step of pumping by the suction pump 600 may be located after step S1 and/or step S2, as long as the step is performed before step S3 and step S4, and the sum of the flow rate of the suction gas of the suction pump 600 and the flow rate of the suction gas of the aerosol particle size spectrometer 402 meets the working flow requirement of the sampler 301 to be tested, all of which fall within the protection scope of the present invention.
The terms "first" and "second," and the like in the description and claims of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not set forth for a listed step or element but may include other steps or elements not listed.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. The utility model provides a sample thief collection efficiency evaluation device based on static case method which characterized in that includes:
a plurality of atomizing aerosol generators capable of being communicated with a generating gas source so as to respectively charge monodispersion particle solutions with different particle diameters into the plurality of atomizing aerosol generators;
the blending cabin is communicated with the output end of the atomized aerosol generator, and the input end of the blending cabin can be communicated with a dilution air source;
the test bin is communicated with the output end of the blending cabin, and a tested sampler and a reference pipeline are detachably mounted in the test bin;
the analysis cabin is provided with an aerosol diluter and an aerosol particle size spectrometer, the detected sampler and the reference pipeline are communicated with the input end of the aerosol diluter, a first electromagnetic valve is arranged between the detected sampler and the aerosol diluter, and a second electromagnetic valve is arranged between the reference pipeline and the aerosol diluter.
2. The sampler collection efficiency evaluation device based on the static box method as claimed in claim 1, characterized by further comprising a control cabin;
the control cabin is internally provided with a first mass flow controller and a second mass flow controller, the first mass flow controller can be communicated with the generated air source, the second mass flow controller can be communicated with the diluted air source, the output end of the first mass flow controller is communicated with the input end of the atomized aerosol generator, and the output end of the second mass flow controller is communicated with the blending cabin.
3. The sampler collection efficiency evaluation device based on the static box method as claimed in claim 2, wherein a multi-way valve is further arranged in the control chamber, and the multi-way valve is arranged between the first mass flow controller and the atomized aerosol generator.
4. The sampler collection efficiency evaluation device based on the static box method according to claim 3, wherein a third mass flow controller is further arranged in the control cabin, the sampler collection efficiency evaluation device further comprises an air suction pump, one end of the third mass flow controller is communicated with an upstream pipeline of the aerosol diluter, and the other end of the third mass flow controller is communicated with the air suction pump.
5. The sampler collection efficiency evaluation device based on the static box method as claimed in claim 4, wherein the control cabin is further provided with a control panel, and the first mass flow controller, the second mass flow controller, the multi-way valve, the third mass flow controller and the aerosol particle size spectrometer are all electrically connected with the control panel.
6. The sampler collection efficiency evaluation device based on the static box method according to claim 2, characterized in that the sampler collection efficiency evaluation device further comprises an air source device, and the output end of the air source device is respectively communicated with the atomized aerosol generator and the blending chamber.
7. The sampler collection efficiency evaluation device based on the static tank method as claimed in claim 1, wherein the atomized aerosol generator is composed of a thin tube with venturi effect and siphon effect.
8. The sampler collection efficiency evaluation device based on the static box method according to claim 1, wherein the blending chamber adopts a venturi structure capable of improving the uniformity of aerosol.
9. The sampler collection efficiency evaluation device based on the static box method as claimed in claim 1, wherein the sampler to be tested is a PM2.5 cutter.
10. A sampler collection efficiency evaluation method, characterized in that the sampler collection efficiency evaluation device based on the static box method according to any one of claims 1 to 9 is applied, comprising the steps of:
s1: respectively filling the monodisperse particle solutions with different particle diameters into a plurality of atomization aerosol generators;
s2: one of the plurality of atomized aerosol generators is communicated with a generating air source to generate aerosol with a preset particle size, the aerosol enters the blending cabin, and meanwhile, the blending cabin is communicated with a diluting air source to dilute the aerosol in the blending cabin;
s3: aerosol particles in the mixing cabin enter a test bin, a first electromagnetic valve is closed, a second electromagnetic valve is opened, so that the aerosol in the test bin enters an aerosol diluter through a reference pipeline, and primary detection is carried out on the concentration of the particles in the test bin through an aerosol particle size spectrometer;
s4: closing the second electromagnetic valve, opening the first electromagnetic valve to enable the aerosol collected by the sampler to be detected to enter the aerosol diluter, and performing secondary detection on the concentration of the particles through the aerosol particle size spectrometer;
s5: repeating steps S2 to S4 until all of the aerosol generators generate aerosol particles of a predetermined size.
11. The sampler collection efficiency evaluation method according to claim 10, wherein the step S2 includes:
s2-1: controlling the airflow velocity of aerosol generated by the atomized aerosol generator entering the blending cabin through a first mass flow controller;
s2-1: and controlling the flow rate of the airflow of the dilution air source entering the blending cabin through a second mass flow controller.
12. The sampler collection efficiency evaluation method according to claim 11, wherein the step S2 further includes:
S2-A1: and opening one passage in the multi-way valve to lead one of the plurality of atomizing aerosol generators to be communicated with the generated gas source.
13. The sampler collection efficiency evaluation method according to claim 11, wherein before the steps S3 and S4 are performed, the suction flow rate of the suction pump is controlled by a third mass flow controller.
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