CN113899846A - Ambient air O3Device and method for measuring potential generation - Google Patents
Ambient air O3Device and method for measuring potential generation Download PDFInfo
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- CN113899846A CN113899846A CN202111070193.4A CN202111070193A CN113899846A CN 113899846 A CN113899846 A CN 113899846A CN 202111070193 A CN202111070193 A CN 202111070193A CN 113899846 A CN113899846 A CN 113899846A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—Specially adapted to detect a particular component
- G01N33/0037—Specially adapted to detect a particular component for NOx
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- G—PHYSICS
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- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—Specially adapted to detect a particular component
- G01N33/0039—Specially adapted to detect a particular component for O3
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Abstract
The invention discloses an environmental air O3The device comprises a reaction cavity, a detection assembly, an air inlet assembly and a compensation assembly; the gas inlet assembly is connected with the reaction cavity, the detection assembly is connected with the reaction cavity through a three-way valve, one end of a three-way pipeline is communicated with the atmosphere, and the compensation assembly is connected with the reaction cavity; the air inlet assembly comprises an air source, a first flow controller, a filter, an ozone removing device, a humidity control system and a two-way valve, wherein the first flow controller is arranged between the air source and the filter, the ozone removing device is arranged between the filter and the humidity control system, and the two-way valve is arranged between the humidity control system and the reaction cavity; the scheme can realize the direct measurement of the ozone generation potential of the ambient air, avoid the estimation deviation caused by indirect estimation and more truly measure the O of active species in the atmosphere3Contribution generated, the apparatusThe requirements of atmospheric environment monitoring, analysis and the like can be better met.
Description
Technical Field
The invention relates to the field of atmospheric environment monitoring and experimental science research, in particular to an environmental air O3A device and a method for measuring a formation potential.
Background
Ozone (O)3) Is the most important atmospheric pollutant in cities of ChinaOne, the first step. In recent years, city O3The pollution is prominent day by day and obviously presents regional and compound characteristics, which seriously affects the quality of atmospheric environment and becomes the most main restriction factor for continuously improving the quality of environmental air.
Low altitude O3In general, nitrogen oxides (NOx), Volatile Organic Compounds (VOCs), and the like are generated by photochemical reactions in seasons where the temperature is high and the solar radiation is strong. Thus for atmospheric O3The transformation process of the precursor of the compound is becoming one of the focus of research at home and abroad. Existing research is directed to O in the environment3The generation potential of the compound is mainly estimated by detecting the precursor VOCs and combining the existing maximum increment reaction coefficient (MIR) value, but the existing analysis condition has limited detection on the composition and concentration of the VOCs in the environment, and the MIR value is an extreme value obtained under a specific condition and cannot reflect the real condition of the atmospheric environment.
Therefore, the development of a direct determination device and a direct determination method for the ozone generation potential of the ambient air has great significance for researching the pollution potential of the ambient air and controlling the pipes.
Disclosure of Invention
The invention aims to provide the environmental air O aiming at the defects3The device and the method for measuring the generation potential solve the problems that the analysis conditions in the prior art are limited for detecting the concentration of VOCs in the environment, and the MIR value is an extreme value obtained under a specific condition and cannot reflect the real conditions of the atmospheric environment.
The scheme is realized as follows:
ambient air O3The generation potential measuring device comprises a reaction cavity, a detection assembly, an air inlet assembly and a compensation assembly; the gas inlet assembly is connected with the reaction cavity, the detection assembly is connected with the reaction cavity through a three-way valve, one end of the three-way pipeline is communicated with the atmosphere, and the compensation assembly is connected with the reaction cavity.
Based on above-mentioned ambient air O3The gas inlet assembly comprises a gas source, a first flow controller, a filter, an ozone removing device, a humidity control system andthe first flow controller is arranged between the air source and the filter, the ozone removing device is arranged between the filter and the humidity control system, and the two-way valve is arranged between the humidity control system and the reaction cavity.
Based on above-mentioned ambient air O3The structure of the potential measuring device is generated, and the detection assembly comprises a three-way valve, an ozone monitoring device and a NOx monitoring device; the ozone monitoring device and the NOx monitoring device are respectively connected with the reaction cavity through a three-way valve.
Based on above-mentioned ambient air O3The structure of the potential measuring device is generated, and the reaction cavity comprises a reaction chamber, a light source, a temperature and humidity monitoring device, a temperature control box, a circulating fan and photolysis efficiency measuring equipment; the utility model discloses a photolysis efficiency measuring device, including reaction chamber, light source, circulating fan, photolysis efficiency measuring equipment, temperature control box, temperature and humidity monitoring device, the reaction chamber is established in the reaction chamber, the light source sets up at reaction chamber top position, circulating fan sets up in the reaction chamber, photolysis efficiency measuring equipment sets up in reaction chamber bottom position, the temperature control box sets up the outside at the reaction chamber, temperature and humidity monitoring device sets up in the reaction chamber.
Based on above-mentioned ambient air O3The structure of the potential measuring device is generated, the compensation assembly comprises a second flow controller and a gas steel cylinder, the gas steel cylinder is communicated with the reaction chamber through the second flow controller, and gas to be compensated in the gas steel cylinder is accurately and quantitatively filled into the reaction chamber through the second flow controller.
Based on above-mentioned ambient air O3And generating a structure of the potential measuring device, wherein the first flow controller or the second flow controller is one or more of flow control devices such as a mass flow meter, a float flow meter, a needle valve or a proportional solenoid valve.
Based on above-mentioned ambient air O3And generating a structure of the potential measuring device, wherein the temperature control box needs to be capable of regulating and controlling the internal temperature of the box body within the range of 10-40 ℃.
The invention also provides an environmental air O3A method for measuring the potential of the formation,
the method comprises the following specific steps;
air intake: tong (Chinese character of 'tong')The gas in the environment is filtered and decontaminated and O is removed by the over-air inlet component3And the reaction chamber is filled after the humidity is regulated;
calibrating O in an environment3And NOx: detection of gas components in the ambient atmosphere, in particular O, by means of a detection assembly3And NOx;
measurement of pre-reaction concentration: after the air inlet step is finished, detecting O3 and NOx in the atmosphere in the reaction cavity through a detection assembly;
starting the measurement: the illumination test is carried out in the reaction cavity, the temperature stability of the reaction chamber is controlled by the temperature control box, and the O in the reaction chamber is detected by the detection component3Concentration and NOx concentration, determining O in ambient air under specific conditions3A potential is generated.
The air inlet step is specifically that an air source and a two-way valve are opened, ambient air passes through a first flow controller, a filter, an ozone removing device and a humidity control system in sequence, and finally enters a reaction chamber through a one-way valve; and simultaneously, the temperature and humidity monitoring device and the circulating fan are started, and the temperature and humidity in the reaction chamber are controlled to be consistent with the environment.
The specific steps for starting the measurement are that a light source, a photolysis efficiency measuring device, an ozone monitoring device and a NOx monitoring device are turned on, and O in the reaction chamber is recorded3The concentration and the concentration of NOx are controlled by a second flow controller according to the experiment requirement, NO with specific concentration is added into the reaction chamber2(ii) a And recording the reading of the ozone monitoring equipment until the reading of the ozone monitoring equipment does not rise any more; determination of O in ambient air under specific conditions3A potential is generated.
Compared with the prior art, the invention has the beneficial effects that:
1. the scheme can realize the direct measurement of the ozone generation potential of the ambient air, avoid the estimation deviation caused by indirect estimation and more truly measure the O of active species in the atmosphere3The generated contribution can better meet the requirements of atmospheric environment monitoring, analysis and the like.
Drawings
FIG. 1 is a schematic structural view of the present invention as a whole;
in the figure: 1. a reaction chamber; 2. a detection component; 3. an air intake assembly; 4. a compensation component; 11. a reaction chamber; 12. a light source; 13. a temperature and humidity monitoring device; 14. a temperature control box; 15. a circulation fan; 16. a photolysis efficiency measurement device; 21. a three-way valve; 22. an ozone monitoring device; 23. a NOx monitoring device; 31. a gas source; 32. a first flow controller; 33. a filter; 34. an ozone removal device; 35. a humidity control system; 36. a two-way valve; 41. a second flow controller; 42. gas cylinders.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example 1
As shown in fig. 1, the present invention provides a technical solution:
ambient air O3The generation potential measuring device comprises a reaction cavity, a detection assembly, an air inlet assembly and a compensation assembly; the gas inlet assembly is connected with the reaction cavity, the detection assembly is connected with the reaction cavity through a three-way valve, one end of a three-way pipeline is communicated with the atmosphere, and the compensation assembly is connected with the reaction cavity;
based on the structure, the gas inlet assembly is used for processing gas in the environment and then filling the processed gas into the reaction cavity, the detection is used for calibrating each component in the environment and measuring the components before and after reaction in the reaction cavity, and the compensation assembly is used for supplementing the lacking components in the reaction cavity.
The air inlet assembly comprises an air source, a first flow controller, a filter, an ozone removing device, a humidity control system and a two-way valve, wherein the first flow controller is arranged between the air source and the filter, the ozone removing device is arranged between the filter and the humidity control system, and the two-way valve is arranged between the humidity control system and the reaction cavity;
based on the structure, the gas source provides environmental gas components for the whole measuring device, so that the whole reaction can be measured under more accurate environmental gas components; the first flow controller controls the flow of the gas source entering the reaction cavity, so that the filter can remove the particulate matters provided by the gas source and reduce the influence of the particulate matters on the experiment; the ozone removing device removes ozone gas entering the reaction cavity, and the humidity control system can humidify gas of a gas source to specified humidity, so that the experiment can be conveniently carried out under the condition close to a real environment; the two-way valve controls the on-off of the gas path between the gas inlet assembly and the reaction cavity;
the detection assembly comprises a three-way valve, ozone monitoring equipment and NOx monitoring equipment; the ozone monitoring device and the NOx monitoring device are respectively connected with the reaction cavity through a three-way valve, and respectively measure the concentration of ozone and the concentration of NOx in the environment and the reaction cavity; the gas input ends of the ozone monitoring device and the NOx monitoring device can be switched through the three-way valve, so that the experiment is convenient to carry out;
the reaction cavity comprises a reaction chamber, a light source, a temperature and humidity monitoring device, a temperature control box, a circulating fan and photolysis efficiency measuring equipment; the reaction chamber is arranged in the middle of the reaction cavity, the light source is arranged at the top of the reaction cavity, the circulating fan is arranged in the reaction chamber, the photolysis efficiency measuring equipment is arranged at the bottom of the reaction cavity, the temperature control box is arranged on the outermost side of the reaction cavity, and the temperature and humidity monitoring device is arranged in the reaction chamber;
based on above-mentioned structure, the temperature control box provides the environment of temperature adjustable for whole experiment, and the light source provides trigger condition for the experiment, and temperature and humidity monitoring devices detects the temperature and humidity in the reacting chamber, and convenient follow-up adjusts the humiture, guarantees that the environmental data of reacting chamber is unanimous with the data in the external environment, and circulating fan is with the quick mixing of component in the reacting chamber.
The compensation assembly comprises a second flow controller and a gas steel cylinder, the gas steel cylinder is communicated with the reaction chamber through the second flow controller, and gas to be compensated in the gas steel cylinder is accurately and quantitatively filled into the reaction chamber through the second flow controller; the gas in the gas steel cylinder is NO2A standard gas.
The air source can adopt an oil-free air compressor or an oil-free dry pump; the first flow controller or the second flow controller can adopt flow control equipment such as a mass flow meter, a float flow meter, a needle valve or a proportional solenoid valve;
the filter adopts the special fluorine dragon material, need to be able to filter the particle size among the environment and be greater than 2 microns ozone remove device can be the laminar flow board of KI coating, ensures O3The removal efficiency is more than 99 percent;
the humidity control system can be humidified by a purified water bubbling method or a humidifier (FC-200-;
the two-way valve or three-way valve can be made of Polytetrafluoroethylene (PTFE), meltable Polytetrafluoroethylene (PFA) or stainless steel
The light source can sample ultraviolet lamp tubes (<420nm), xenon lamps and natural light sources;
the temperature and humidity monitoring device can be a commercial temperature and humidity probe and a data acquisition system;
the circulating fan is made of Polytetrafluoroethylene (PTFE) or fusible Polytetrafluoroethylene (PFA) materials;
the reaction chamber is made of Polytetrafluoroethylene (PTFE) or fusible Polytetrafluoroethylene (PFA) material;
the photolysis efficiency measuring device can be a commercial photolysis spectrometer or a J (NO) spectrometer2) A filtering radiometer;
the temperature control box body is not limited in material, and the internal temperature of the box body can be regulated and controlled within the range of 10-40 ℃;
the ozone monitoring device; the self-made or commercial detection equipment can be adopted, and the detection method is an ultraviolet absorption method and the like.
The NOx monitoring equipment can adopt self-made or commercial detection equipment, and the detection method is a chemiluminescence method, an absorption spectrum method and the like
The method can realize the direct measurement of the ozone generation potential of the ambient air, avoid the estimation deviation caused by indirect estimation and more truly measure the O of active species in the atmosphere3The generated contribution can better meet the requirements of atmospheric environment monitoring, analysis and the like.
Example 2
Based on the above example 1, this example provides a method for directly measuring the ozone generation potential of ambient air, which comprises the following steps;
air intake: opening an air source and a two-way valve, enabling ambient air to sequentially pass through a first flow controller, a filter, an ozone removing device and a humidity control system, and finally entering a reaction chamber through a one-way valve; simultaneously, starting a temperature and humidity monitoring device and a circulating fan to keep the temperature and humidity in the reaction chamber consistent with the environment;
accurately controlling the atmospheric flux entering the reaction chamber through a first flow controller, removing particulate matters with the particle size larger than 2 microns in the atmospheric environment through a filter, finally removing ozone filled in the atmospheric environment through an ozone removing device, and accurately adjusting the temperature and the humidity in a chamber corresponding to a temperature and humidity monitoring device through a humidity control system;
calibrating O in an environment3And NOx: changing the flow direction of the three-way pipe connected with the ozone monitoring equipment and the NOx monitoring equipment to connect the ozone monitoring equipment and the NOx monitoring equipment with the atmospheric environment so as to monitor the ozoneEquipment for measuring O in ambient air and NOx monitoring equipment3The concentration of NOx;
measurement of pre-reaction concentration: after the reaction chamber finishes air inlet, the two-way valve is closed, the three-way valve is connected with the reaction chamber, and O in the reaction chamber is measured3And NOx concentration, before ensuring light irradiation, O3The concentration is less than the detection limit, and the concentration of NOx is close to the concentration of the environment;
starting the measurement: turning on a light source, a photolysis efficiency measuring device, an ozone monitoring device and a NOx monitoring device, recording O in a reaction chamber3The concentration and the concentration of NOx are controlled by a second flow controller according to the experiment requirement, NO with specific concentration is added into the reaction chamber2(ii) a And recording the reading of the ozone monitoring equipment until the reading of the ozone monitoring equipment does not rise any more; determination of O in ambient air under specific conditions3A potential is generated.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. Ambient air O3The device for measuring the generation potential is characterized by comprising a reaction cavity, a detection component, an air inlet component and a compensation component; the gas inlet assembly is connected with the reaction cavity, the detection assembly is connected with the reaction cavity through a three-way valve, one end of the three-way pipeline is communicated with the atmosphere, and the compensation assembly is connected with the reaction cavity.
2. Ambient air O according to claim 13A device for measuring a formation potential, comprising: the air inlet assembly comprises an air source, a first flow controller, a filter, an ozone removing device, a humidity control system and a two-way valve, wherein the first flow controller is arranged between the air source and the filter, the ozone removing device is arranged between the filter and the humidity control system, and the two-way valve is arranged between the humidity control system and the reaction cavity.
3. Ambient air O according to claim 23A device for measuring a formation potential, comprising: the detection assembly comprises a three-way valve, ozone monitoring equipment and NOx monitoring equipment; the ozone monitoring device and the NOx monitoring device are respectively connected with the reaction cavity through a three-way valve.
4. Ambient air O according to claim 23A device for measuring a formation potential, comprising: the reaction cavity comprises a reaction chamber, a light source, a temperature and humidity monitoring device, a temperature control box, a circulating fan and photolysis efficiency measuring equipment; the utility model discloses a photolysis efficiency measuring device, including reaction chamber, light source, circulating fan, photolysis efficiency measuring equipment, temperature control box, temperature and humidity monitoring device, the reaction chamber is established in the reaction chamber, the light source sets up at reaction chamber top position, circulating fan sets up in the reaction chamber, photolysis efficiency measuring equipment sets up in reaction chamber bottom position, the temperature control box sets up the outside at the reaction chamber, temperature and humidity monitoring device sets up in the reaction chamber.
5. Ambient air O according to claim 23A device for measuring a formation potential, comprising: the compensation assembly comprises a second flow controller and a gas steel cylinder, the gas steel cylinder is communicated with the reaction chamber through the second flow controller, and gas to be compensated in the gas steel cylinder is accurately and quantitatively filled into the reaction chamber through the second flow controller.
6. Ambient air O according to claim 53A device for measuring a formation potential, comprising: the first flow controller or the second flow controller is one or more of flow control devices such as a mass flow meter, a float flow meter, a needle valve or a proportional solenoid valve.
7. Ambient air O according to claim 43A device for measuring a formation potential, comprising: the temperature control box needs to be capable of regulating and controlling the internal temperature of the box body within the range of 10-40 ℃.
8. Based on the rightRequires any one of 1 to 7 of the ambient air O3A method for measuring a formation potential measuring apparatus, comprising:
the method comprises the following specific steps;
air intake: gas in the environment is filtered and decontaminated and O is removed through the gas inlet assembly3And the reaction chamber is filled after the humidity is regulated;
calibrating O in an environment3And NOx: detection of gas components in the ambient atmosphere, in particular O, by means of a detection assembly3And NOx;
measurement of pre-reaction concentration: after the air inlet step is finished, detecting each component in the atmosphere in the reaction cavity through a detection assembly;
starting the measurement: carrying out illumination test in the reaction chamber, and detecting O in the reaction chamber through the detection component3Concentration and NOx concentration, determining O in ambient air under specific conditions3A potential is generated.
9. Ambient air O according to claim 83A method for measuring a formation potential, comprising: the air inlet step is specifically that an air source and a two-way valve are opened, ambient air passes through a first flow controller, a filter, an ozone removing device and a humidity control system in sequence, and finally enters a reaction chamber through a one-way valve; and simultaneously, the temperature and humidity monitoring device and the circulating fan are started, and the temperature and humidity in the reaction chamber are controlled to be consistent with the environment.
10. Ambient air O according to claim 93A method for measuring a formation potential, comprising: the specific steps for starting the measurement are that a light source, a photolysis efficiency measuring device, an ozone monitoring device and a NOx monitoring device are turned on, and O in the reaction chamber is recorded3The concentration and the concentration of NOx are controlled by a second flow controller according to the experiment requirement, NO with specific concentration is added into the reaction chamber2(ii) a And recording the reading of the ozone monitoring equipment until the reading of the ozone monitoring equipment does not rise any more; determination of O in ambient air under specific conditions3A potential is generated.
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| CN202111070193.4A CN113899846B (en) | 2021-09-13 | 2021-09-13 | Device and method for measuring ozone generation potential of ambient air |
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| CN202111070193.4A CN113899846B (en) | 2021-09-13 | 2021-09-13 | Device and method for measuring ozone generation potential of ambient air |
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2021
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| US20040018630A1 (en) * | 2002-07-26 | 2004-01-29 | Birks John W. | Method and apparatus to detect a gas by measuring ozone depletion |
| CN108008070A (en) * | 2017-11-22 | 2018-05-08 | 沈阳大学 | It is a kind of that photochemically reactive analysis method is occurred to atmosphere organic pollutant |
| CN110057983A (en) * | 2019-05-20 | 2019-07-26 | 华北电力大学 | A kind of ozone origin analysis method based on observation data and chemical mechanism |
| CN111855602A (en) * | 2020-07-29 | 2020-10-30 | 北京大学 | System for measuring ozone generation rate in field environment |
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