CN113884614A - Device and method for evaluating potential generated by secondary particles through photo-oxidation of ambient air - Google Patents
Device and method for evaluating potential generated by secondary particles through photo-oxidation of ambient air Download PDFInfo
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- CN113884614A CN113884614A CN202111195413.6A CN202111195413A CN113884614A CN 113884614 A CN113884614 A CN 113884614A CN 202111195413 A CN202111195413 A CN 202111195413A CN 113884614 A CN113884614 A CN 113884614A
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- 239000012080 ambient air Substances 0.000 title claims abstract description 39
- 238000007539 photo-oxidation reaction Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000011163 secondary particle Substances 0.000 title claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 111
- 239000002245 particle Substances 0.000 claims abstract description 85
- 239000000126 substance Substances 0.000 claims abstract description 33
- 238000006303 photolysis reaction Methods 0.000 claims abstract description 17
- 238000004458 analytical method Methods 0.000 claims abstract description 14
- 239000013618 particulate matter Substances 0.000 claims abstract description 12
- 238000004868 gas analysis Methods 0.000 claims abstract description 3
- 239000003570 air Substances 0.000 claims description 27
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 21
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 21
- 238000012806 monitoring device Methods 0.000 claims description 20
- -1 polytetrafluoroethylene Polymers 0.000 claims description 18
- 238000011156 evaluation Methods 0.000 claims description 17
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- 238000005259 measurement Methods 0.000 claims description 12
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- 229910002651 NO3 Inorganic materials 0.000 claims description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 4
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- 238000004566 IR spectroscopy Methods 0.000 claims description 3
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- 230000001105 regulatory effect Effects 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910052724 xenon Inorganic materials 0.000 claims description 3
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000002795 fluorescence method Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 53
- 239000003344 environmental pollutant Substances 0.000 description 8
- 231100000719 pollutant Toxicity 0.000 description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
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Abstract
The invention discloses a device and a method for evaluating the potential generated by secondary particles through photo-oxidation of ambient air, wherein the device comprises: the gas source conveying chamber, with gas source conveying chamber and ambient gas carry out the selectivity intercommunication, be equipped with the reaction chamber of light source generating device and photodissociation efficiency measuring equipment, with the standard gas room of reaction chamber through flow controller intercommunication, with reaction chamber and ambient gas carry out the analysis subassembly of selectivity intercommunication, the analysis subassembly includes particle size spectrometer, particulate matter chemical component monitor and gas analysis appearance. The method can accurately evaluate the generation potential of gas photooxidation secondary particles in the environment.
Description
Technical Field
The invention relates to the technical field of pollutant evaluation methods and devices.
Background
The atmospheric pollutants, i.e. primary pollutants, emitted by human activities and nature can generate gaseous and particle-state secondary pollutants through complex atmospheric photochemical reactions, free radical reactions and particle surface multiphase reactions, and these reactions form complex nonlinear chemical processes in the atmosphere, and the generated secondary pollutants have great difference in environmental influence and control compared with the primary pollutants.
In recent years, since the primary emission is effectively controlled, the fine Particulate Matter (PM) generated by the secondary conversion is generated2.5) The proportion is in an ascending trend, so that the atmospheric pollution in urban areas increasingly and obviously presents regional and composite characteristics, and becomes the most main limiting factor for continuously improving the quality of the ambient air.
The prior art mainly estimates the generation potential of secondary pollution particles of gaseous pollutants in the environment by detecting and analyzing precursors of the secondary pollution particles and based on the research result of the existing smoke box simulation experiment, but the existing analysis conditions have limited detection on the types and concentrations of different gaseous pollutants in the environment, particularly VOCs cannot reflect the real situation of the atmospheric environment, and accurate estimation or evaluation results are difficult to obtain.
Disclosure of Invention
The invention aims to provide a device and a method capable of accurately evaluating the generation potential of gas photooxidation secondary particles in the environment.
The invention firstly discloses the following technical scheme:
an environmental air photooxidation secondary particle generates latent potential evaluation device, it includes:
the gas source conveying chamber, with gas source conveying chamber and ambient gas carry out the selectivity intercommunication, be equipped with the reaction chamber of light source generating device and photodissociation efficiency measuring equipment, with the standard gas room of reaction chamber through flow controller intercommunication, with reaction chamber and ambient gas carry out the analysis subassembly of selectivity intercommunication, the analysis subassembly includes particle size spectrometer, particulate matter chemical component monitor and gas analysis appearance.
According to some preferred embodiments of the invention, the standard gas chamber comprises SO2Standard gas storage chamber, NO2Standard gas storage chamber and NH3A standard gas storage chamber.
According to some preferred embodiments of the invention, the gas analyzer comprises SO2Analyzer, NOxAnalyzer and NH3An analyzer.
According to some preferred embodiments of the present invention, the particle size spectrometer comprises an electrostatic classifier and an agglomerated particle counter.
According to some preferred embodiments of the present invention, the particulate matter chemical composition monitor can measure the mass concentration of one or more of organic matter, sulfate, nitrate, ammonium salt and chloride.
According to some preferred embodiments of the invention, the SO is2The analyzer performs analysis and determination by an ultraviolet fluorescence method.
According to some preferred embodiments of the invention, the NO isxThe analyzer analyzes and measures the nitrogen oxides by a chemiluminescence method and/or an absorption spectroscopy method.
According to some preferred embodiments of the invention, the NH is3The analyzer performs analysis and measurement by infrared absorption spectrometry.
According to some preferred embodiments of the invention, the evaluation device comprises in particular: the device comprises a gas source conveying chamber, a reaction chamber, first to third standard gas chambers, a particle size spectrometer, a particle chemical component monitor and a first to third gas analyzer, wherein the reaction chamber is communicated with the gas source conveying chamber through a first flow controller, a humidity controller and a first three-way valve in sequence and comprises a temperature control box body and photolysis efficiency measuring equipment, the first to third standard gas chambers are communicated with the reaction chamber through second to fourth flow controllers respectively, the particle size spectrometer and the particle chemical component monitor are communicated with the reaction chamber through a second three-way valve and a third three-way valve respectively, and the first to third gas analyzers are communicated with the reaction chamber through fourth to sixth three-way valves respectively.
According to some preferred embodiments of the invention, the evaluation device further comprises: the temperature control device comprises a first temperature and humidity monitoring device arranged outside a temperature control box body of the reaction chamber, a second temperature and humidity monitoring device arranged inside the box body of the reaction chamber, a light source generating device arranged inside the temperature control box body, a first circulating fan and a second circulating fan arranged inside the reaction chamber, wherein the first circulating fan is close to the reaction chamber and a communication port of a standard gas chamber, and the second circulating fan is close to the reaction chamber and a particle size spectrometer and a communication port of a particle chemical component monitor.
According to some preferred embodiments of the present invention, one or more of the first to fourth flow controllers employs one or more of a mass flow meter, a float flow meter, a needle valve, or a proportional solenoid valve.
According to some preferred embodiments of the invention, the humidity controller comprises a humidification device and a humidity probe.
According to some preferred embodiments of the present invention, the first to sixth three-way valves are made of a material selected from one or more of polytetrafluoroethylene, soluble polytetrafluoroethylene, or stainless steel.
According to some preferred embodiments of the present invention, the first and/or second temperature and humidity monitoring device includes a temperature and humidity probe and a data acquisition system.
According to some preferred embodiments of the present invention, the first and/or second circulation fans are made of a material selected from the group consisting of polytetrafluoroethylene and/or soluble polytetrafluoroethylene.
According to some preferred embodiments of the invention, the reaction chamber is made of a material selected from the group consisting of polytetrafluoroethylene and/or soluble polytetrafluoroethylene.
According to some preferred embodiments of the present invention, the temperature-controlled cabinet can regulate the temperature inside the cabinet within a range of 10-40 ℃.
According to some preferred embodiments of the present invention, the air supply transfer chamber uses an oil-free air compressor and/or an oil-free dry pump for air supply generation and transfer.
According to some preferred embodiments of the present invention, the light source generating device employs one or more of an ultraviolet lamp, a xenon lamp, and a natural light source.
According to some preferred embodiments of the present invention, the photolysis efficiency determination apparatus employs a photolysis spectrometer and/or a filtered radiometer.
The invention further provides an evaluation method for the potential of generation of secondary particles by photo-oxidation of ambient air, which comprises the following steps:
continuously carrying out photooxidation reaction on ambient air in a reaction chamber communicated with the atmosphere to obtain secondary generated and converted particles, wherein the ambient condition in the reaction chamber is close to the actual ambient condition, and the actual ambient condition comprises the air temperature, the air humidity and SO contained in the air2、NOxAnd NH3The concentration of (c);
after the photo-oxidation reaction is finished, measuring SO in the gas in the reaction chamber2，NOx，NH3The concentration variation of (2); particle size distribution and mass concentration of the secondarily generated and converted particulate matter within the reaction chamber; the mass concentrations of sulfate, nitrate, ammonium salt and organic components in the chemical components of the secondarily generated and converted particles;
and determining the maximum particle size of the particles and the maximum mass concentration of each component according to the measurement data, and obtaining the photooxidation secondary particle generation potential of the ambient air under the specific condition according to the maximum value of the total mass concentration of the particles.
Preferably, the generation potential is a difference value between the total mass concentration of the particulate matters obtained when the particle size of the particulate matters and the mass concentration of each component do not rise any more and the mass concentration of the particulate matters in the ambient air in the reaction chamber measured before illumination.
The invention further provides a method for evaluating the potential of generating secondary particles through photooxidation of ambient air by using the evaluation device, which comprises the following steps:
communicating the gas source conveying chamber with the reaction chamber through a first three-way valve, a first flow controller and a humidity controller which are arranged between the gas source conveying chamber and the reaction chamber, and regulating and controlling the temperature and humidity in the reaction chamber to be consistent with the environment through the humidity controller and a temperature control box body according to a first temperature and humidity monitoring device and a second temperature and humidity monitoring device which are arranged inside and outside the reaction chamber;
in the air inlet process, the reaction chamber is communicated with a second three-way valve and a third three-way valve which are arranged between the reaction chamber and the particle size spectrometer and the particle chemical component monitor;
during the gas inlet process, the gas is introduced into the reaction chamber through the SO2Analyzer, NOxAnalyzer, NH3Fourth to sixth three-way valves between the analyzers, which disconnect each gas analyzer from the reaction chamber and communicate with the ambient air to measure the SO in the ambient air2，NOxAnd NH3Concentration;
after the gas inlet is finished, disconnecting the gas source conveying chamber and the reaction chamber, communicating each gas analyzer with the reaction chamber through the fourth to sixth three-way valves, and measuring SO in the reaction chamber2、NOxAnd NH3Concentration;
by setting in SO2Standard gas cell, NO2Standard gas chamber and NH3Second to fourth flow controllers between the standard gas chamber and the reaction chamber for controlling SO2Standard gas, NO2Standard gas and NH3The concentration of the standard gas entering the reaction chamber makes SO in the reaction chamber2、NOxAnd NH3Is in accordance with its concentration in ambient air;
and during measurement, the light source generating device, the photolysis efficiency measuring equipment, the particle size spectrometer and the particle chemical component monitor are turned on, the concentration of the particles in the reaction chamber and the mass concentration of chemical components of the particles are recorded, and the generation potential of secondary particles is determined.
The method can directly measure the generation potential of the secondary particles of photooxidation of the ambient air, avoids estimation deviation caused by indirect estimation, can more truly measure the contribution of active species in the atmosphere to the generation of the fine particles in the daytime, and can better meet the requirements of monitoring and analyzing the atmospheric environment and the like.
Drawings
Fig. 1 is a schematic structural view of a specific evaluation apparatus.
Detailed Description
The present invention is described in detail below with reference to the following embodiments and the attached drawings, but it should be understood that the embodiments and the attached drawings are only used for the illustrative description of the present invention and do not limit the protection scope of the present invention in any way. All reasonable variations and combinations that fall within the spirit of the invention are intended to be within the scope of the invention.
Referring to fig. 1, a specific apparatus for evaluating the potential of ambient air for photo-oxidation of secondary particulate matter formation includes: a gas source transfer chamber 1, a reaction chamber 10 containing a temperature control box 12 and a photolysis efficiency measuring device 11, which is communicated with the gas source transfer chamber 1 sequentially through a first flow controller 2, a humidity controller 3 and a first three-way valve 4, first to third standard gas chambers 24, 26 and 28 communicated with the reaction chamber 10 respectively through second to fourth flow controllers 23, 25 and 27, a particle size spectrometer 14 and a particulate chemical component monitor 16 communicated with the reaction chamber 10 respectively through a second three-way valve 13 and a third three-way valve 15, and first to third gas analyzers 18, 20 and 22 communicated with the reaction chamber 10 respectively through fourth to sixth three-way valves 17, 19 and 21; it still includes: the temperature and humidity monitoring device comprises a first temperature and humidity monitoring device 5 arranged outside a temperature control box body 12 of a reaction chamber 10, a second temperature and humidity monitoring device 7 arranged inside the box body 12, a light source generating device 6 arranged inside the temperature control box body 12, and a first circulating fan 8 and a second circulating fan 9 arranged in the reaction chamber 10, wherein the first circulating fan 8 is close to the reaction chamber 10 and a communication port of a standard gas chamber, and the second circulating fan 9 is close to the reaction chamber 10 and a communication port of a particle size spectrometer 14 and a particulate chemical component monitor 16.
In a specific embodiment, the first to third standard gas chambers store SO respectively2Standard gas, NO2Standard gas and NH3A standard gas; the first to third gas analyzers are SO respectively2Analyzer, NOxAnalyzerAnd NH3An analyzer.
Wherein, in the concrete implementation,
the air supply transfer chamber 1 can be air-supplied and transferred using, for example, an oil-free air compressor, an oil-free dry pump, or the like, and is in communication with the atmosphere to transfer ambient air into the reaction chamber 10.
The first to fourth flow rate controllers 2, 23, 25, 27 may employ a flow rate control device such as a mass flow meter, a float flow meter, a needle valve, or a proportional solenoid valve.
The humidity controller 3 may employ a device such as humidification by Pure water bubbling method or humidifier (e.g., FC-200 + 780-7MP, Perma-Pure), and humidity measurement by humidity probe, which humidifies the gas source gas to a specified humidity.
The first to sixth three-way valves 4, 13, 15, 17, 19, 21 may be three-way valves made of, for example, Polytetrafluoroethylene (PTFE), soluble Polytetrafluoroethylene (PFA), or stainless steel.
The first and/or second temperature and humidity monitoring devices 5 and 7 can adopt the existing or self-made devices containing temperature and humidity probes and data acquisition systems;
the light source generating device 6 may be a natural light source that can be turned on or off an ultraviolet lamp (<420nm), a xenon lamp, or the like, or can be shielded or opened.
The first and/or second circulation fans 8, 9 are preferably made of, for example, Polytetrafluoroethylene (PTFE) or soluble Polytetrafluoroethylene (PFA).
The reaction chamber 10 is preferably made of Polytetrafluoroethylene (PTFE) or soluble Polytetrafluoroethylene (PFA) material.
The photolysis efficiency measuring apparatus 11 may be, for example, a photolysis spectrometer or a filtered radiation meter (e.g., J (NO)2) Filter radiometer) whose temperature-controlled enclosure 12 is preferably made of a material that allows regulation of the temperature inside the enclosure in the range of 10-40 c.
The particle size spectrometer 14 may employ existing or self-made equipment for particle size measurement by electrostatic classifiers and for particle concentration determination by agglomerated particle counters.
The particulate matter chemical composition monitor 16 may employ existing or self-made equipment that can measure the mass concentration of species such as organics, sulfates, nitrates, ammonium salts, and chlorides.
SO2The analyzer 18 may employ SO by ultraviolet fluorescence or the like2Existing or home-made assay devices for analysis.
NOxThe analyzer 20 may employ existing or home-made detection equipment for nitrogen oxide analysis by chemiluminescence, absorption spectroscopy, or the like.
NH3The analyzer 22 may employ NH by infrared absorption spectroscopy or the like3Existing or home-made assay devices for analysis.
The method for measuring the potential generated by photo-oxidizing secondary particles in ambient air by using the device comprises the following steps:
firstly, opening a first temperature and humidity monitoring device 5, a second temperature and humidity monitoring device 7, an air source conveying chamber 1, a flow controller 2 and a second circulating fan 9, measuring the temperature and humidity of the ambient air at the moment by the first temperature and humidity monitoring device 5, and the air source chamber conveying chamber 1 communicated with the ambient air is communicated with the ambient air at one outlet of the first three-way valve 4 and is disconnected with the reaction chamber 10 after passing through the humidity control device 3 through the first three-way valve 4, so as to adjust the humidity of the ambient air to be fed into the reaction chamber 10 to be consistent with the temperature and humidity of the ambient air measured by the first temperature and humidity monitoring device 5, thereafter, the first three-way valve 4 is switched to allow the humidity-adjusted ambient air to enter the reaction chamber 10 including the temperature-controlled chamber 12 and the photolysis efficiency measuring device 11, the temperature and humidity in the reaction chamber 10 are measured by the temperature and humidity monitoring device 8, and the temperature and humidity in the reaction chamber are further regulated and controlled by the temperature control box body 12 to be consistent with the ambient air;
in the air inlet process, a particle size spectrometer 14 and a particle chemical composition monitor 16 which are connected with the second three-way valve 13 and the third three-way valve 15 are communicated with the reaction chamber 10, so that the particle size distribution and the composition of the generated particles can be measured in the measurement;
during the air intake process, SO is caused to flow through the fourth to sixth three-way valves 17, 19, 212Analyzer 18, NOx Analyzer 20 and NH3The analyzer 22 is disconnected from the reaction chamber 10 and is in communication with the ambient air, thereby measuringDetermining SO in ambient air2，NOx，NH3Concentration;
after the reaction chamber has been completely charged, the flow rate controller 2 is closed, and the analyzers 18, 20, 22 are connected to the reaction chamber 10 via the three-way valves 17, 19, 21, whereby the SO in the reaction chamber is measured2、NOx、NH3Concentration, ensure before light irradiation, SO2，NOx，NH3The concentration is close to the environmental concentration, and the adjustment mode can be as follows: SO is controlled by flow controllers 23, 25, 27 respectively2Standard gas, NO2Standard gas and NH3The concentration of standard gas entering the reaction chamber 10;
during measurement, the light source generating device 6, the photolysis efficiency measuring device 11, the particle size spectrometer 14 and the particle chemical component monitor 16 are turned on, the concentration of particles in the reaction chamber 10 and the mass concentration change of key chemical components are recorded, and the generation potential of secondary particles in photochemical reaction of ambient air under specific conditions is determined according to the readings of the particle size spectrometer 14 and the particle chemical component monitor 16.
Specifically, the evaluation method may include:
under conditions close to actual environment (temperature, humidity, SO)2、NOx、NH3Concentration) of the gas in the reaction chamber, and the gas in the reaction chamber is subjected to photo-oxidation reaction, so that the particles begin to generate and convert for the second time;
when measured, by SO2Analyzer 18, NOx Analyzer 20 and NH3An analyzer 22 is connected to the reaction chamber 10 for determining SO in the gas in the reaction chamber2，NOx，NH3The change in concentration of (c);
real-time information such as particle size distribution, number concentration and the like of particles in the reaction chamber is measured through a particle size spectrometer 14; the contents of chemical components such as sulfate, nitrate, ammonium salt, organic components and the like of the particulate matters generated by the photo-oxidation reaction are obtained through the reading of the particulate matter chemical component monitor 16;
according to the particle size spectrometer 14, the maximum particle size of the particle growth is determined, and the photooxidation secondary particle generation potential of the ambient air under specific conditions is obtained by combining the information of the maximum mass concentration which can be reached by each component and is measured by the particle chemical component monitor 16.
Example 1
The embodiment provides a device and a method for evaluating the potential generated by photo-oxidizing secondary particles in ambient air, which comprises the following specific steps;
firstly, calibrating SO in the environment2，NOx，NH3The concentration of (a): will react with SO2，NOx，NH3The three-way pipe connected with the monitoring equipment changes the flow direction of the pipeline to ensure that SO2，NOx，NH3The monitoring equipment is connected with the atmospheric environment to ensure that the SO2，NOx，NH3Monitoring equipment for respectively measuring SO in ambient air2，NOx，NH3Respectively at a concentration of 10ppbv, 20ppbv, 15 ppbv; meanwhile, the temperature and humidity of the ambient air at this time are measured by the first temperature and humidity monitoring device 5, and the relative humidity is 50% at 25 ℃.
Air intake: opening an air source to enable ambient air to sequentially pass through the first flow controller, adjusting the flow of inlet air, enabling the inlet air humidity to be controlled to be 50% through a humidity control system, and finally enabling the inlet air to enter the reaction chamber through a three-way valve; and simultaneously, starting a temperature and humidity monitoring device and a circulating fan, and controlling the temperature of the reaction chamber to be 25 ℃ by adjusting a temperature control box body.
Measurement of pre-reaction concentration: after the reaction chamber finishes gas inlet, the three-way pipe changes the flow direction of the pipeline to measure SO in the reaction chamber2，NOx，NH3Concentration, accurately adding SO into the reaction chamber through a flow controller2，NOx，NH3Gas, before ensuring light, SO2，NOx，NH3The concentration was close to the ambient concentration (10 ppbv, 20ppbv, 15ppbv, respectively); opening a particle size spectrometer to measure real-time information (50nm-300nm, 10 nm) such as particle size distribution, number concentration, total mass concentration and the like of particles in a reaction chamber4#/cm3,5μg/m3) Recording as initial conditions for the reaction; opening a particle chemical component monitor to obtain the contents of chemical components such as sulfate, nitrate, ammonium salt and organic components of the particles before reaction;
starting the measurement:turning on the light source, photolysis efficiency measuring equipment, and recording SO in the reaction chamber2，NOx，NH3The real-time concentration obtained by the monitoring equipment is monitored by a particle size spectrometer, and the particle chemical composition monitor reads until the total mass concentration of the particles does not rise any more, the mass concentration measured by the particle chemical composition monitor does not rise any more, and the total mass concentration (50 mu g/m) of the particles measured by the particle size spectrometer is measured by the particle size spectrometer3) Deducting the mass concentration of ambient particles (45. mu.g/m) measured before illumination3) I.e. the potential value generated by the secondary fine particles under the condition of specific ambient air.
The above examples are merely preferred embodiments of the present invention, and the scope of the present invention is not limited to the above examples. All technical schemes belonging to the idea of the invention belong to the protection scope of the invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention, and such modifications and embellishments should also be considered as within the scope of the invention.
Claims (10)
1. The utility model provides an environmental air photooxidation secondary particle generates latent potential evaluation device which characterized in that, it includes: the gas source conveying chamber, with gas source conveying chamber and ambient gas carry out the selectivity intercommunication, be equipped with the reaction chamber of light source generating device and photodissociation efficiency measuring equipment, with the standard gas room of reaction chamber through flow controller intercommunication, with reaction chamber and ambient gas carry out the analysis subassembly of selectivity intercommunication, the analysis subassembly includes particle size spectrometer, particulate matter chemical component monitor and gas analysis appearance.
2. The evaluation device of claim 1, wherein the standard gas chamber comprises SO2Standard gas storage chamber, NO2Standard gas storage chamber and NH3A standard gas storage chamber.
3. The evaluation device of claim 1, wherein the gas analyzer comprises an SO2Analyzer, NOxAnalyzer and NH3An analyzer.
4. The apparatus according to claim 3, wherein the particle size spectrometer comprises an electrostatic classifier and an agglomerated particle counter; and/or the particle chemical composition monitor can measure the mass concentration of one or more of organic matters, sulfate, nitrate, ammonium salt and chloride; and/or, the SO2The analyzer performs analysis and determination through an ultraviolet fluorescence method; and/or, the NOxThe analyzer analyzes and measures the oxynitride by a chemiluminescence method and/or an absorption spectroscopy method; and/or, the NH3The analyzer performs analysis and measurement by infrared absorption spectrometry.
5. The evaluation device according to claim 1, characterized in that it specifically comprises: the device comprises a gas source conveying chamber, photolysis efficiency measuring equipment, first to third standard gas chambers, a particle size spectrometer, a particle chemical component monitor and a first to third gas analyzer, wherein the photolysis efficiency measuring equipment is communicated with the gas source conveying chamber through a first flow controller, a humidity controller and a first three-way valve in sequence and comprises a temperature control box body and a reaction chamber, the first to third standard gas chambers are communicated with the reaction chamber through second to fourth flow controllers respectively, the particle size spectrometer and the particle chemical component monitor are communicated with the reaction chamber through a second three-way valve and a third three-way valve respectively, and the first to third gas analyzers are communicated with the reaction chamber through fourth to sixth three-way valves respectively.
6. The evaluation device according to claim 5, characterized in that it further comprises: the temperature control device comprises a first temperature and humidity monitoring device arranged outside a temperature control box body of the reaction chamber, a second temperature and humidity monitoring device arranged inside the box body of the reaction chamber, a light source generating device arranged inside the temperature control box body, a first circulating fan and a second circulating fan arranged inside the reaction chamber, wherein the first circulating fan is close to the reaction chamber and a communication port of a standard gas chamber, and the second circulating fan is close to the reaction chamber and a particle size spectrometer and a communication port of a particle chemical component monitor.
7. The evaluation device of claim 6, wherein one or more of the first to fourth flow controllers is one or more of a mass flow meter, a float flow meter, a needle valve, or a proportional solenoid valve; and/or the humidity controller comprises a humidifying device and a humidity probe; and/or the first to sixth three-way valves are made of one or more materials selected from polytetrafluoroethylene, soluble polytetrafluoroethylene or stainless steel; and/or the first and/or second temperature and humidity monitoring devices comprise temperature and humidity probes and a data acquisition system; and/or, the first and/or second circulating fan is made of a material selected from polytetrafluoroethylene and/or soluble polytetrafluoroethylene; and/or, the preparation material of the reaction chamber is selected from polytetrafluoroethylene and/or soluble polytetrafluoroethylene; and/or the temperature control box body can regulate and control the internal temperature of the box body within the range of 10-40 ℃.
8. The evaluation device of any one of claims 1-7, wherein the air supply transfer chamber employs an oil-free air compressor and/or an oil-free dry pump for air supply generation and transfer; and/or the light source generating device adopts one or more of an ultraviolet lamp tube, a xenon lamp and a natural light source; and/or, the photolysis efficiency determination device employs a photolysis spectrometer and/or a filtered radiometer.
9. The method for evaluating the potential generated by secondary particles through photo-oxidation in ambient air is characterized by comprising the following steps of:
continuously carrying out photooxidation reaction on ambient air in a reaction chamber communicated with the atmosphere to obtain secondary generated and converted particles, wherein the ambient condition in the reaction chamber is close to the actual ambient condition, and the actual ambient condition comprises the air temperature, the air humidity and SO contained in the air2、NOxAnd NH3The concentration of (c);
after the photo-oxidation reaction is finished, measuring SO in the gas in the reaction chamber2，NOx，NH3The concentration variation of (2); the secondary in the reaction chamberGenerating particle size distribution and mass concentration of the converted particulate matter; the mass concentrations of sulfate, nitrate, ammonium salt and organic components in the chemical components of the secondarily generated and converted particles;
and determining the maximum particle size of the particles, the maximum mass concentration of each component in the particles and the maximum value of the total mass concentration of each component in the particles according to the measurement data to obtain the photooxidation secondary particle generation potential of the ambient air under specific conditions.
10. A method of evaluating the potential for ambient air photo-oxidation of secondary particulate matter formation by the evaluation device of any one of claims 1-8, comprising:
the gas source conveying chamber is communicated with the reaction chamber through a first three-way valve, a first flow controller and a humidity controller which are arranged between the gas source conveying chamber and the reaction chamber, and the temperature and the humidity in the reaction chamber are regulated and controlled to be consistent with the environment through the humidity controller and a temperature control box body according to first and second temperature and humidity monitoring devices which are arranged inside and outside the reaction chamber;
in the air inlet process, the reaction chamber is communicated with a second three-way valve and a third three-way valve which are arranged between the reaction chamber and the particle size spectrometer and between the reaction chamber and the particle chemical component monitor;
during the gas inlet process, the gas is introduced into the reaction chamber through the SO2Analyzer, NOxAnalyzer, NH3Fourth to sixth three-way valves between the analyzers, which disconnect each gas analyzer from the reaction chamber and communicate with the ambient air to measure the SO in the ambient air2，NOxAnd NH3Concentration;
after the gas inlet is finished, disconnecting the gas source conveying chamber and the reaction chamber, communicating each gas analyzer with the reaction chamber through the fourth to sixth three-way valves, and measuring SO in the reaction chamber2、NOxAnd NH3Concentration;
by setting in SO2Standard gas cell, NO2Standard gas chamber and NH3Between the standard gas chamber and the reaction chamberSecond to fourth flow controllers controlling SO2Standard gas, NO2Standard gas and NH3The concentration of the standard gas entering the reaction chamber makes SO in the reaction chamber2、NOxAnd NH3Is in accordance with its concentration in ambient air;
and during measurement, the light source generating device, the reaction chamber, the particle size spectrometer and the particle chemical component monitor are turned on, the concentration of the particles in the reaction chamber and the mass concentration of chemical components of the particles are recorded, and the generation potential of secondary particles is determined.
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