CN111458454A - Atmospheric oxidation indicator factor detection device and detection method - Google Patents
Atmospheric oxidation indicator factor detection device and detection method Download PDFInfo
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Abstract
The embodiment of the invention relates to an atmospheric oxidation indicator factor detection device and a detection method, wherein the device comprises a first air flow path, a second air flow path, a third air flow path, an ozone flow path, a nitric oxide flow path, a first mixing chamber, a second mixing chamber, a detection flow path, a nitrogen dioxide detector and a sampling device; the sampling device is capable of collecting an air sample via the first, second and third air flow paths; the first air flow path is provided with a catalytic device for catalytically reducing NOy in the air sample to NO; the ozone flow path is provided with an ozone supply device; the first air flow path, the second air flow path and the ozone flow path are respectively communicated with the first mixing chamber; a nitric oxide supply device is arranged in the nitric oxide flow path; the third air flow path and the nitric oxide flow path are respectively communicated with the second mixing chamber; the first mixing chamber and the second mixing chamber are communicated with a nitrogen dioxide detector through a detection flow path. The device has high detection precision, accuracy and reliability.
Description
Technical Field
The invention belongs to the technical field of atmospheric environment detection, and particularly relates to a device and a method for detecting an atmospheric oxidation indicator factor.
Background
Atmospheric photochemical smog is a strongly oxidizing pollutant composed of secondary pollutants mainly comprising ozone. Under the influence of increased human activities, nitrogen oxides and volatile organic compounds rich in urban and regional atmosphere react under the irradiation of the sun to generate a plurality of gases with strong oxidizability. In the region of rapid economic development in China and extra-large cities, the atmospheric oxidation level is high, and detection of atmospheric oxidation indexes is necessary.
Disclosure of Invention
The embodiment of the invention aims to provide a device and a method for detecting an atmospheric oxidation indicator factor.
The embodiment of the invention provides an atmospheric oxidation indicator factor detection device, which comprises a first air flow path, a second air flow path, a third air flow path, an ozone flow path, a nitric oxide flow path, a first mixing chamber, a second mixing chamber, a detection flow path, a nitrogen dioxide detector and a sampling device, wherein the first air flow path is connected with the second air flow path; the sampling device is capable of collecting an air sample via the first, second and third air flow paths; the first air flow path is configured with a catalytic device for catalytically reducing NOy in an air sample to NO; the ozone flow path is provided with an ozone supply device; the first air flow path, the second air flow path and the ozone flow path are respectively communicated with the first mixing chamber; a nitric oxide supply device is disposed in the nitric oxide flow path; the third air flow path and the nitric oxide flow path are respectively communicated with the second mixing chamber; the first mixing chamber and the second mixing chamber are communicated with a nitrogen dioxide detector through a detection flow path.
Further, the first air flow path is provided with a first enrichment device; the second air flow path is provided with a second enrichment device; a third enrichment device is arranged in the third air flow path; the first enrichment device, the second enrichment device and the third enrichment device are respectively used for enriching air samples.
Further, the first enrichment device, the second enrichment device and the third enrichment device are all transparent enrichment cavities, and the inner diameter of each enrichment cavity is larger than the pipe diameter of the corresponding air flow path.
Further, the enrichment chamber is made of quartz material.
Further, the second enrichment device has a detachable first shutter member, and the third enrichment device has a detachable second shutter member; the second air flow path is also in communication with the second mixing chamber.
Further, the first air flow path is provided with a first electrically controlled valve; the third air flow path is provided with a third electric control valve; the ozone flow path is provided with a fourth electric control valve; the nitric oxide flow path is provided with a fifth electric control valve; the detection flow path is provided with a first three-way electric control valve, or the detection flow path comprises a first detection flow path and a second detection flow path, the first mixing chamber is communicated with the nitrogen dioxide detector through the first detection flow path, the second mixing chamber is communicated with the nitrogen dioxide detector through the second detection flow path, and the first detection flow path and the second detection flow path are respectively provided with an electric control valve; the second air flow path is respectively communicated with the first mixing chamber and the second mixing chamber through a second three-way electric control valve, or the second air flow path is communicated with the first mixing chamber through a second electric control valve and communicated with the second mixing chamber through a sixth electric control valve.
Further, the ozone flow path is also provided with a first flow controller; the nitric oxide flow path is also provided with a second flow controller; the sampling device is communicated with the nitrogen dioxide detector through a sampling flow path and is used for collecting an air sample and sending gas to be detected into the nitrogen dioxide detector, and the sampling flow path is provided with a third flow controller.
Further, the detection device also comprises a controller, wherein the controller is used for controlling the on-off of the sampling device, the on-off of the ozone supply device, the on-off of the nitric oxide supply device, the on-off and catalytic temperature of the catalytic device, the on-off of the nitrogen dioxide detector, each electric control valve and each flow controller.
The embodiment of the invention also provides a method for detecting the generation rate of the total atmospheric oxidant by using the atmospheric oxidizing indicator factor detection device, which comprises the following steps:
s1, enabling the air sample to enter a third enrichment device through a third air flow path, enabling the enriched air to enter a second mixing chamber, enabling NO gas to enter the second mixing chamber through a nitric oxide flow path, and enabling the NO gas and O in the air sample to enter the second mixing chamber3Carrying out reaction;
and S2, feeding the gas to be detected obtained by the reaction into a nitrogen dioxide detector to obtain the volume fraction of Ox in the atmosphere, and calculating to obtain the total atmospheric oxidant generation rate dOx/dt.
The embodiment of the invention also provides a method for detecting the generation efficiency of the total atmospheric oxidant by using the atmospheric oxidizing indicator factor detection device, which comprises the following steps:
s1, enabling the air sample to enter a first enrichment device through a first air flow path, enabling the air sample to enter a catalytic device after enrichment, enabling NOy in the air sample to enter a first mixing chamber after being catalytically reduced into NO, enabling ozone to enter the first mixing chamber through an ozone flow path to react with NO, and enabling the gas to be detected to enter a nitrogen dioxide detector; the air sample enters the second enrichment device through the third air flow path, and the NO gas enters the second mixing chamber through the nitric oxide flow path and is mixed with O in the air sample3After the reaction, the gas to be detected enters a nitrogen dioxide detector; obtaining the volume fraction of NOy in the atmosphere through detection calculation;
s2, enabling the air sample to enter a second enrichment device through a second air flow path, enabling the air sample to enter a first mixing chamber after enrichment, enabling ozone to enter the first mixing chamber through an ozone flow path to react with NO in the air sample, enabling the gas to be detected to enter a nitrogen dioxide detector, and obtaining the volume fraction of NOx through detection and calculation;
s3, enabling the air sample to enter a third enrichment device through a third air flow path, enabling the enriched air to enter a second mixing chamber, enabling NO gas to enter the second mixing chamber through a nitric oxide flow path, and enabling the NO gas and O in the air sample to enter the second mixing chamber3After the reaction; the gas to be detected enters a nitrogen dioxide detector to obtain the volume fraction of Ox;
s4, according to t time and t0The volume fractions of Ox, NOy and NOx in the atmosphere at the moment are obtained to obtain the volume fraction difference value Ox (t-t) of the Ox, NOy and NOx in the sampling time0)，NOy(t-t0) And NOx (t-t)0) Detecting for multiple times to obtain multiple volume fraction difference values Ox (t-t)0)，NOy(t-t0) And NOx (t-t)0) For a plurality of Ox (t-t)0) And [ NOy (t-t)0)-NOx(t-t0)]Performing linear regression on the values to obtain a linear regression curve, wherein the slope k of the curve is the generation efficiency of the total atmospheric oxidant; the source of ozone in the atmosphere can be resolved according to the k value.
The embodiment of the invention has the following beneficial effects: the atmospheric oxidation indicator factor detection device provided by the embodiment of the invention can be used for detecting the atmospheric oxidation indicator factor and analyzing the source of the total oxidant, and the system is high in precision, accurate and reliable.
Drawings
FIG. 1 is a schematic view of an atmospheric oxidation indicator detection apparatus according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a control system of an atmospheric oxidizing indicator factor detection device according to an embodiment of the present invention.
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 specific embodiments and the accompanying drawings. Those skilled in the art will appreciate that the present invention is not limited to the drawings and the following examples.
In the present invention, the symbol "Ox" represents the total atmospheric oxidant, among the various atmospheric oxidants, O3And NO2Most of them, therefore, the present invention employs O3And NO2Represents the total atmospheric oxidant "Ox" and is used for characterizing the atmospheric oxidizing capacity.
In the present invention, the symbol "NOx" represents NO and NO2The symbol "NOz" represents the oxidation product of NOx, and the symbol "NOy" represents the set of NOx and NOz.
In the present invention, the atmospheric oxidation indicator refers to parameters related to the oxidation of the atmosphere, including but not limited to the total oxidant generation efficiency, the total oxidant generation rate, NOx, NOy, Ox, NO2And the volume fraction of oxidizing agent in the atmosphere.
EXAMPLE 1 atmospheric oxidizing indicator detection device
Referring to fig. 1, the present embodiment proposes an atmospheric oxidation indicator factor detection device, which includes a first air flow path 10, a second air flow path 20, a third air flow path 30, an ozone flow path 40, a nitric oxide flow path 50, a first mixing chamber 60, a second mixing chamber 70, a nitrogen dioxide detector 90, and a sampling flow path S; the first, second and third air flow paths 10, 20, 30 are used for collecting air samples.
The first air flow path 10 is provided with a first enrichment device 11, a catalytic device 12 and a first electrically controlled valve 13. The first enrichment device 11 is used for enriching an air sample. The catalytic device 12 is used to catalytically reduce NOy in an air sample to NO.
The second air flow path 20 is provided with a second enrichment device 21 and a second electrically controlled valve 22. The second enrichment device 21 is used for enriching the air sample.
The ozone flow path 40 is provided with an ozone supply device 41, a first flow controller 42, and a fourth electrically controlled valve 43. The ozone supply device 41 is, for example, an ozone generator, and supplies ozone.
The first air flow path 10, the second air flow path 20 and the ozone flow path 40 are respectively communicated with a first mixing chamber 60, and the first mixing chamber 60 is used as a reaction chamber for the ozone supplied from the first air flow path 10 and the ozone flow path 40 or a reaction chamber for the outflow gas of the second air flow path 20 and the ozone supplied from the ozone flow path 40.
The third air flow path 30 is provided with a third enrichment device 31 and a third electrically controlled valve 32. The third enrichment means 31 is used for enriching the air sample.
The nitric oxide flow path 50 is provided with a nitric oxide supply device 51, a second flow controller 52, and a fifth electronic control valve 53. The nitric oxide supplying means 51 is, for example, a nitric oxide cylinder or other means capable of generating nitric oxide, and is used for supplying an excessive amount of nitric oxide gas to react with ozone.
The third air flow path 30 and the nitric oxide flow path 50 are respectively communicated with a second mixing chamber 70, and the second mixing chamber 70 is used as a reaction chamber for the outflow gas of the third air flow path 30 and the nitric oxide gas supplied from the nitric oxide flow path 50.
The first mixing chamber 60 and the second mixing chamber 70 are connected to a nitrogen dioxide detector 90 via a first three-way electric control valve T1 and a detection flow path 80. In another embodiment, the detection flow path 80 includes a first detection flow path and a second detection flow path, the first mixing chamber 60 and the second mixing chamber 70 may also communicate with the nitrogen dioxide detector 90 through the first detection flow path and the second detection flow path, respectively, and an electrically controlled valve is disposed on each of the first detection flow path and the second detection flow path to control the flow path on/off.
The sampling flow path S is provided with a third flow controller 91 and a sampling device 92, and is configured to collect an air sample and send a gas to be detected, which is a gas entering the nitrogen dioxide detector 90, to the nitrogen dioxide detector 90, for example, an air sample or a mixed gas obtained after the air sample is reacted. The sampling device 92, such as a sampling pump, is used to collect an air sample. The nitrogen dioxide detector 90 is, for example, an ion chromatograph or a cavity ring-down spectrometer.
The first enrichment device 11, the second enrichment device 21 and the third enrichment device 31 are, for example, enrichment chambers made of quartz material, and the inner diameter of the enrichment chambers is larger than the pipe diameter of the flow path. Therefore, the sample injection amount can be increased, and after the pipeline in the flow path is narrowed, the air sample rapidly passes through the pipeline; because the inner diameter of the enrichment cavity is larger than the pipe diameter of the flow path, water vapor in the air is deposited in the enrichment cavity after being condensed, thereby eliminating water vapor interference; the enrichment cavity made of quartz material is a transparent enrichment cavity, so that observation is convenient, and when the volume fraction of Ox in the atmosphere is detected, the enrichment cavity is transparent, so that the enrichment cavity can receive illumination, and the volume fraction of Ox in the actual atmosphere light environment can be measured.
Preferably, the second air flow path 20 is also communicated with the second mixing chamber 70, for example, the second air flow path 20 is communicated with the first mixing chamber 60 and the second mixing chamber 70 respectively through a second three-way electric control valve T2 (the second electric control valve 22 is replaced by a second three-way electric control valve T2, so as to increase the flow path branches of the second air flow path and the second mixing chamber 70), or is communicated with the second mixing chamber 70 through a sixth electric control valve; so that the air sample in the second air flow path 20 can be selectively introduced into either the first mixing chamber 60 or the second mixing chamber 70 as required for analysis; the second enrichment device 21 is provided with a detachable first shading part, the third enrichment device 31 is provided with a detachable second shading part, and the first shading part and the second shading part can respectively enable the second enrichment device 21 and the third enrichment device 31 to be in a darkroom state and not to be irradiated by light. The first shading part and the second shading part which are detachable can be installed or uninstalled according to needs. When the first light-shielding member or the second light-shielding member is installed, the sample air is further subjected to photochemical reaction without being affected by light.
Preferably, each electric control valve is an electromagnetic valve.
Preferably, the atmospheric oxidation indicator factor detection device further comprises a controller, and referring to a schematic control system diagram shown in fig. 2, the controller is configured to control opening and closing of the sampling device, opening and closing of the ozone supply device, opening and closing of the nitric oxide supply device, opening and closing of the catalytic device and catalytic temperature, opening and closing of the nitrogen dioxide detector, each electronic control valve, and each flow controller. Thereby controlling the collection of an air sample, the supply of ozone and nitric oxide, the start-stop and catalytic temperature of a catalytic device, the treatment of the air sample, the detection and data processing of the gas to be detected and the like. This detection device thus achieves automatic control, and can detect a plurality of different parameters relating to atmospheric oxidation as required for analysis (as described in detail below).
The multiple flow paths of the atmospheric oxidizing indicator factor detecting device of the embodiment, in combination with the first mixing chamber, the second mixing chamber and the nitrogen dioxide detector, can be used for detecting multiple atmospheric oxidizing indicator factors, including but not limited to atmospheric oxidizing indicator factors such as the volume fraction of NOy, the volume fraction of Ox and the volume fraction of NOx in the atmosphere, and can obtain atmospheric oxidizing indicator factors such as the total atmospheric oxidant generation rate and the total atmospheric oxidant generation efficiency through data processing.
The first air flow path 10 can be used to detect the volume fraction of NOy in the atmosphere, and a sample of air is enriched by the first enrichment device 11 and then enters the catalytic device 12, where the NOy in the air is catalytically reduced to a fractionConverted to NO and fed into the first mixing chamber 60 with the addition of excess O3Complete reaction in the first mixing chamber 60 to produce NO2And detecting NO with a nitrogen dioxide detector2And obtaining the volume fraction of NOy in the atmosphere through data processing.
Similarly, the second air flow path 20 can be used to detect the volume fraction of NOx in the atmosphere and the third air flow path 30 can be used to detect the volume fraction of Ox in the atmosphere.
From the volume fraction of Ox in air, the total atmospheric oxidant generation rate dOx/dt can be obtained by calculation with a time resolution of at least 2 s.
According to the time t and t0The volume fractions of Ox, NOy and NOx in the atmosphere at the moment are obtained to obtain Ox (t-t) in the sampling time0)，NOy(t-t0) And NOx (t-t)0) Volume fraction difference (t) of0The moment is sampling starting time, the moment t is sampling ending time, the same is applied below), the time resolution is minimum minute, and a plurality of Ox (t-t) are obtained by multiple detection0)，NOy(t-t0) And NOx (t-t)0) For a plurality of Ox (t-t)0) Value of and [ NOy (t-t)0)-NOx(t-t0)]And performing linear regression on the values to obtain a linear regression curve, wherein the slope of the curve is the generation efficiency of the atmospheric total oxidant.
In a preferred embodiment, the second air flow path 20, the third air flow path 30, the nitric oxide flow path 50 and the first light-blocking member or the second light-blocking member, which are connected in parallel, can detect the total atmospheric oxidant generation rate dOx/dt of the air in different regions under the same illumination condition, and can compare the air oxidizing conditions in different regions. Specifically, two collected air samples of a target area respectively enter a second air flow path 20 and a third air flow path 30, one of the enrichment devices is shielded by a light shielding part, the air samples in the enrichment devices do not generate photochemical reaction, after a preset time, the atmospheric total oxidant generation rate of the target area is dOx/dt through detection, the air samples in the enrichment devices of the other flow path continuously generate photochemical reaction through actual illumination, and after the same preset time, the air samples are detected, so that the atmospheric total oxidant generation rate of the target is dOx/dt; the difference between the two flow paths dOx/dt is the ozone generation rate of the target area, and comparison of multiple areas dOx/dt can study the strength of the atmospheric oxidation capacity of the area.
The present invention will be described in detail below with reference to examples, which illustrate how the atmospheric oxidizing factor detecting device of the present embodiment is used to detect an atmospheric oxidizing factor.
Example 2 method for detecting the Generation Rate of Total atmospheric Oxidation agent
The embodiment provides a method for detecting the generation rate of the total atmospheric oxidant, which adopts the atmospheric oxidizing indicator factor detection device of the embodiment 1, and comprises the following steps:
the controller controls the detection device to enter an atmosphere total oxidant generation rate detection state;
collecting an air sample through the third air flow path 30, the air sample entering the third enrichment device 31 along the third air flow path 30, enriching the air sample, and entering the second mixing chamber 70;
excess NO gas enters the second mixing chamber 70 through the nitric oxide flow path, and reacts with O in the air sample3React to form NO2；
The gas to be measured obtained by the reaction enters a nitrogen dioxide detector 90 to obtain NO2The volume fraction of (e), i.e., the volume fraction of Ox in the atmosphere, is calculated to enable real-time acquisition of the total atmospheric oxidant generation rate dOx/dt. The temporal resolution is a minimum of 2 s.
The specific working mode for detecting the generation rate of the total atmospheric oxidant by using the detection device is as follows: the controller sends out a control instruction for detecting the generation rate of the total atmospheric oxidant, and the detection device enters a detection state of the generation rate of the total atmospheric oxidant; the third electrically controlled valve 32 is opened and the first three-way electrically controlled valve T1 is adjusted to the total oxidant generation rate detection path; the sampling pump is started, the third flow controller 91 starts to operate, the sampling pump continuously operates, and the air sample enters the second mixing chamber 70 after being enriched by the third enrichment device 31 along the third air flow path 30; the fifth electronically controlled valve 53 is opened and the second flow controller 52 controls the flow of NO gas into the second mixing chamber 70 and into the O in the air sample3React to form NO2(ii) a The sample enters the nitrogen dioxide detector 90 from the second mixing chamber 70 to obtain NO2The volume fraction of Ox, i.e., the volume fraction of Ox, is calculated to obtain the total atmospheric oxidant generation rate dOx/dt in real time with a time resolution of at least 2 s.
Example 3 method for detecting efficiency of generating total atmospheric oxidants
The embodiment provides a method for detecting the generation efficiency of total atmospheric oxidants, which adopts the atmospheric oxidizing indicator factor detection device of embodiment 1, and comprises the following steps:
the controller controls the detection device to enter an atmosphere total oxidant generation efficiency detection state;
collecting an air sample through a first air flow path 10, enabling the air sample to enter a first enrichment device 11, enabling the air sample to enter a catalytic device 12 after enrichment, enabling the NOy in the air sample to be catalytically reduced into NO, enabling the sample to enter a first mixing chamber 60, enabling an ozone supply device to supply excessive ozone to the first mixing chamber 60 through an ozone flow path 40, enabling the ozone to react with the NO in the gas, and obtaining NO2And enters the nitrogen dioxide detector 90; excess NO gas enters the second mixing chamber 70 through the nitric oxide flow path 50, and reacts with O in the air sample3React to form NO2And enters the nitrogen dioxide detector 90; and obtaining the volume fraction of NOy in the atmosphere through detection calculation.
Collecting air sample through the second air flow path 20, introducing the air sample into the second enrichment device 21, introducing the air sample into the first mixing chamber 60 after enrichment, supplying excessive ozone to the first mixing chamber 60 through the ozone flow path 40 by the ozone supply device 41, and converting NO in the ozone and the air sample into NO2And then enters the nitrogen dioxide detector 90, and the volume fraction of the NOx is obtained through detection calculation.
Collecting an air sample through a third air flow path 30, wherein the air sample enters a third enrichment device 31 and enters a second mixing chamber after being enriched; excess NO gas enters the second mixing chamber 70 through the nitric oxide flow path 50, and reacts with O in the air sample3React to form NO2(ii) a The gas to be measured enters a nitrogen dioxide detector 90 after the reaction to obtain NO2I.e. the volume fraction of Ox in the atmosphere.
Detecting time t and t separately0The volume fractions of Ox, NOy and NOx in the atmosphere at the moment are obtained to obtain the volume fraction difference value Ox (t-t) of the Ox, NOy and NOx in the sampling time0)，NOy(t-t0) And NOx (t-t)0) Detecting for multiple times to obtain multiple volume fraction difference values Ox (t-t)0)，NOy(t-t0) And NOx (t-t)0) For a plurality of Ox (t-t)0) And [ NOy (t-t)0)-NOx(t-t0)]Performing linear regression on the values to obtain a linear regression curve, wherein the slope k of the curve is the generation efficiency of the total atmospheric oxidant; when k is>At 8, NOx dominates the production of ozone in the atmosphere; when k is<At 8 deg.C, VOCs (volatile organic compounds) dominate the production of ozone in the atmosphere, with a minimum time resolution of minutes.
The operation of the detection device is similar to that of embodiment 2, and is not repeated.
With reference to the above embodiments, the technical effects of the present invention are described as follows:
the atmosphere oxidative indicator factor detection device provided by the embodiment of the invention is an integrated detection system, can realize online or offline detection, adopts the controller to generate and send industrial control instructions, performs unified control on enriched air, flow path switching or switching, flow controller accurate control, air sample collection and analysis and the like, can detect different atmosphere oxidative indicator factors according to needs, and can analyze the source of ozone in the atmosphere.
The atmospheric oxidation indicator factor detection device provided by the embodiment of the invention can evaluate the generation rate of the total atmospheric oxidant in different time periods in situ and perform ozone precursor sensitivity analysis, so that long-term synchronous observation effective data of Ox, NOx and NOy can be obtained, the device is suitable for researching prominent environmental problems such as compound atmospheric pollution and the like, is also suitable for implementing comprehensive control of various atmospheric pollutants and deepening photochemical pollution control, and provides an effective solution for obtaining measured data and parameters of a verification model.
According to the atmosphere oxidative indicator factor detection device provided by the embodiment of the invention, each flow path is switched through the electric control valve, so that the simultaneous detection of the volume fractions of Ox, NOx and NOy by one nitrogen dioxide detector is realized, and the system calibration can be considered. By controlling the combination of different states of the electric control valve, the generation efficiency of the atmosphere total oxidant and the generation efficiency of the atmosphere total oxidant can be respectively obtained, the conversion between the analysis of the atmospheric oxidation index factor and the system calibration can be realized, and the reliable guarantee is provided for the accurate measurement and the data quality.
The atmospheric oxidative indicator factor detection device provided by the embodiment of the invention has the advantages of high system precision, accuracy and reliability, and can reduce the labor intensity and workload of observers.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The atmospheric oxidation indicator factor detection device is characterized by comprising a first air flow path, a second air flow path, a third air flow path, an ozone flow path, a nitric oxide flow path, a first mixing chamber, a second mixing chamber, a detection flow path, a nitrogen dioxide detector and a sampling device;
the sampling device is capable of collecting an air sample via the first, second and third air flow paths;
the first air flow path is configured with a catalytic device for catalytically reducing NOy in an air sample to NO; the ozone flow path is provided with an ozone supply device; the first air flow path, the second air flow path and the ozone flow path are respectively communicated with the first mixing chamber;
a nitric oxide supply device is disposed in the nitric oxide flow path; the third air flow path and the nitric oxide flow path are respectively communicated with the second mixing chamber;
the first mixing chamber and the second mixing chamber are communicated with a nitrogen dioxide detector through a detection flow path.
2. The atmospheric oxidation indicator factor detection device according to claim 1, wherein the first air flow path is provided with a first enrichment device; the second air flow path is provided with a second enrichment device; a third enrichment device is arranged in the third air flow path; the first enrichment device, the second enrichment device and the third enrichment device are respectively used for enriching air samples.
3. The atmospheric oxidation indicator detection device of claim 2, wherein the first enrichment device, the second enrichment device and the third enrichment device are transparent enrichment chambers, and the inner diameter of each enrichment chamber is larger than the pipe diameter of the corresponding air flow path.
4. The atmospheric oxidation indicator factor detection device of claim 3, wherein the enrichment chamber is made of quartz material.
5. The atmospheric oxidation indicator factor detection device of claim 3, wherein the second enrichment device has a removable first shutter member, and the third enrichment device has a removable second shutter member; the second air flow path is also in communication with the second mixing chamber.
6. The atmospheric oxidation indicator factor detection device according to claim 5, wherein the first air flow path is provided with a first electrically controlled valve; the third air flow path is provided with a third electric control valve; the ozone flow path is provided with a fourth electric control valve; the nitric oxide flow path is provided with a fifth electric control valve; the detection flow path is provided with a first three-way electric control valve, or the detection flow path comprises a first detection flow path and a second detection flow path, the first mixing chamber is communicated with the nitrogen dioxide detector through the first detection flow path, the second mixing chamber is communicated with the nitrogen dioxide detector through the second detection flow path, and the first detection flow path and the second detection flow path are respectively provided with an electric control valve; the second air flow path is respectively communicated with the first mixing chamber and the second mixing chamber through a second three-way electric control valve, or the second air flow path is communicated with the first mixing chamber through a second electric control valve and communicated with the second mixing chamber through a sixth electric control valve.
7. The atmospheric oxidation indicator factor detection device according to claim 6, wherein the ozone flow path is further provided with a first flow controller; the nitric oxide flow path is also provided with a second flow controller; the sampling device is communicated with the nitrogen dioxide detector through a sampling flow path and is used for collecting an air sample and sending gas to be detected into the nitrogen dioxide detector, and the sampling flow path is provided with a third flow controller.
8. The atmospheric oxidation indicator detection device of claim 7, wherein the detection device further comprises a controller, and the controller is used for controlling the on/off of the sampling device, the on/off of the ozone supply device, the on/off of the nitric oxide supply device, the on/off and catalytic temperature of the catalytic device, the on/off of the nitrogen dioxide detector, each electric control valve and each flow controller.
9. A method of detecting the rate of total atmospheric oxidant generation using the atmospheric oxidation indicator factor detection device of any one of claims 1 to 8, comprising the steps of:
s1, enabling the air sample to enter a third enrichment device through a third air flow path, enabling the enriched air to enter a second mixing chamber, enabling NO gas to enter the second mixing chamber through a nitric oxide flow path, and enabling the NO gas and O in the air sample to enter the second mixing chamber3Carrying out reaction;
and S2, feeding the gas to be detected obtained by the reaction into a nitrogen dioxide detector to obtain the volume fraction of Ox in the atmosphere, and calculating to obtain the total atmospheric oxidant generation rate dOx/dt.
10. A method for detecting the total atmospheric oxidant generation efficiency by using the atmospheric oxidation indicator factor detection device according to any one of claims 1 to 8, comprising the steps of:
s1, enabling the air sample to enter a first enrichment device through a first air flow path, enabling the air sample to enter a catalytic device after enrichment, enabling NOy in the air sample to enter a first mixing chamber after being catalytically reduced into NO, enabling ozone to enter the first mixing chamber through an ozone flow path to react with NO,the gas to be detected enters a nitrogen dioxide detector; the air sample enters the second enrichment device through the third air flow path, and the NO gas enters the second mixing chamber through the nitric oxide flow path and is mixed with O in the air sample3After the reaction, the gas to be detected enters a nitrogen dioxide detector; obtaining the volume fraction of NOy in the atmosphere through detection calculation;
s2, enabling the air sample to enter a second enrichment device through a second air flow path, enabling the air sample to enter a first mixing chamber after enrichment, enabling ozone to enter the first mixing chamber through an ozone flow path to react with NO in the air sample, enabling the gas to be detected to enter a nitrogen dioxide detector, and obtaining the volume fraction of NOx through detection and calculation;
s3, enabling the air sample to enter a third enrichment device through a third air flow path, enabling the enriched air to enter a second mixing chamber, enabling NO gas to enter the second mixing chamber through a nitric oxide flow path, and enabling the NO gas and O in the air sample to enter the second mixing chamber3After the reaction; the gas to be detected enters a nitrogen dioxide detector to obtain the volume fraction of Ox;
s4, according to t time and t0The volume fractions of Ox, NOy and NOx in the atmosphere at the moment are obtained to obtain the volume fraction difference value Ox (t-t) of the Ox, NOy and NOx in the sampling time0)，NOy(t-t0) And NOx (t-t)0) Detecting for multiple times to obtain multiple volume fraction difference values Ox (t-t)0)，NOy(t-t0) And NOx (t-t)0) For a plurality of Ox (t-t)0) And [ NOy (t-t)0)-NOx(t-t0)]Performing linear regression on the values to obtain a linear regression curve, wherein the slope k of the curve is the generation efficiency of the total atmospheric oxidant; the source of ozone in the atmosphere can be resolved according to the k value.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111855602A (en) * | 2020-07-29 | 2020-10-30 | 北京大学 | System for measuring ozone generation rate in field environment |
| CN116337822A (en) * | 2023-03-21 | 2023-06-27 | 中国科学院合肥物质科学研究院 | System and method for measuring organic nitrate generation rate |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111855602A (en) * | 2020-07-29 | 2020-10-30 | 北京大学 | System for measuring ozone generation rate in field environment |
| CN111855602B (en) * | 2020-07-29 | 2023-04-25 | 北京大学 | System for measuring ozone generation rate in field environment |
| CN116337822A (en) * | 2023-03-21 | 2023-06-27 | 中国科学院合肥物质科学研究院 | System and method for measuring organic nitrate generation rate |
| CN116337822B (en) * | 2023-03-21 | 2023-12-01 | 中国科学院合肥物质科学研究院 | System and method for measuring organic nitrate generation rate |
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