CN102721755A - Method and apparatus for determining active nitrogen oxide component in particle state in atmosphere particle - Google Patents
Method and apparatus for determining active nitrogen oxide component in particle state in atmosphere particle Download PDFInfo
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- CN102721755A CN102721755A CN2012100774997A CN201210077499A CN102721755A CN 102721755 A CN102721755 A CN 102721755A CN 2012100774997 A CN2012100774997 A CN 2012100774997A CN 201210077499 A CN201210077499 A CN 201210077499A CN 102721755 A CN102721755 A CN 102721755A
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Abstract
A method and an apparatus for determining active nitrogen oxide components in particle state in atmosphere particles. The method mainly comprises steps: 1) an air sample treated with aerodynamic equivalent particle size cutting passes through a molybdenum converter and enters to a nitric oxide detector, so as to detect a concentration of all active nitrogen oxides both in gaseous state and particle state; 2) the air sample treated with aerodynamic equivalent particle size cutting passes through a particle filter to filter out all particles in the air sample; and then the sample passes through the molybdenum converter and enters into the nitric oxide detector, so as to obtain the concentration of active nitrogen oxides in gaseous state; and 3) the concentration of all active nitrogen oxides both in gaseous state and particle state obtained in the step 1) minus the concentration of active nitrogen oxides in gaseous state in the step 2) is a concentration of active nitrogen oxides in equivalent particle size of aerodynamics. The invention also discloses an apparatus for realizing the above method. The invention can effectively satisfy demands of on-line detection method and equipment for NOy of various particle sizes in particle state.
Description
Technical field
The present invention relates to a kind of method of measuring active nitrogen oxide component in the atmosphere, more specifically relate to a kind of method of measuring active nitrogen oxide component in the Atmospheric particulates.
The invention still further relates to a kind of device that is used to realize said method.
Background technology
Urban air-quality is to influence the key factor that the resident is healthy and keep social optimum sustainable development, and especially for each big city of China of rapid economic development, the atmospheric environment problem receives countries in the world and national people from all walks of life's extreme and pays close attention to.Each big city air quality present situation of the whole nation causes anxiety at present, and the pollution effect of wherein grey haze sky is maximum, endangers the heaviest.The major pollutants in ash haze sky: the particle (PM of aerodynamics equivalent grain size below 2.5 microns
2.5) health there are very strong toxic action, PM
2.5Can 100% be deep into bronchiole and alveolar, possible cardiac trigger disease, tuberculosis, breathing problem reduce PFT etc.Research shows that particle state active nitrogen oxide (brief note is NOy) accounts for China city PM
2.5More than 40% of mass concentration.Active strange nitrogen compound (NOy) generally is divided into NOx (NO and NO
2) and converted product NOz (comprising: NO
3, N
2O
5, HNO
3, acetylperoxide nitrate (PAN), other organic nitrates and nitrate gasoloid etc., N
2O and NH
3The row that do not belong to active strange nitrogen species).Wherein, NOz is by NO and NO
2Be transformed through homogeneous phase and heterogeneous phase chemical reaction process; Principal ingredient as photo-chemical smog and grey haze; Can be gaseous state or particle state, it is the interim bank of oxides of nitrogen free radical, and it finally can become the remittance of oxides of nitrogen free radical in atmosphere through dried wet deposition; Also can, other free radicals become the source of photochemical pollution after being regenerated as active nitrogen oxide free radical through long-range conveying.Under the situation that oxides of nitrogen exists, hydroxyl free radical, peroxy radical can also start the also photooxidation reaction of catalytic hydrocarbon.These reactions produce aldehyde, ketone and superoxide etc. and have oxidisability and irritating organic nitrogen-containing aerosol product, also are the important component parts of photo-chemical smog and grey haze particle.Particle state NOy mainly is transformed from the NOx of motor vehicle and industrial discharge, and China's vehicle guaranteeding organic quantity surpasses 100,000,000, and still in quick growth, along with motor vehicle further increases, NOy is at PM
2.5Contribution in the pollution increase that will keep.But at present; Still the checkout equipment that does not have the NOy of particle state targetedly of specialty both at home and abroad; Need gather the concentration level that to understand particle state NOy again after the distinct methods classification and Detection of multiple instrument and equipment; Nitrate like solubility need use ion chromatograph; Acetylperoxide nitrate (PAN) among the NOy needs gas chromatography to add the electronics acquisition detector to detect, organic NOy component need chromaticness online with equipment such as liquid chromatography mass logotype appearance, it is quite big therefore to want to specialize in particle state NOy difficulty.Relevant technical capability is abroad arranged, but, therefore do not have relevant development demand because developed country does not have present this atmosphere combined pollution of China and serious grey haze pollution situation.And China's Atmospheric Chemistry observation procedure research also has suitable gap, also is in dependence on import at present, or imitation stage, and the method equipment that meets China's present situation in many fields all is in blank.The grey haze sky PM of the present invention's design
2.5In the checkout equipment of NOy can be accurately the particle state NOy species of observation and analysis urban area continuously; Its contribution that photochemical pollution, grey haze are formed of quantitative test; Air quality model is improved; Formulation atmospheric pollution policy of regulation and control etc. provides data to support to have researching value and scientific meaning with theoretical.
Summary of the invention:
The object of the present invention is to provide a kind of method of measuring the active nitrogen oxide component in the Atmospheric particulates.
Another purpose of the present invention is to provide a kind of device that is used to realize said method.
Be the realization above-mentioned purpose, the method for the active nitrogen oxide component in the mensuration Atmospheric particulates provided by the invention, its key step is:
1) passes through to get into the nitrogen monoxide detecting device behind the molybdenum converter through the air sample after the predetermined aerodynamics equivalent grain size cutting, record the active nitrogen oxide concentration of all gaseous states and particle state;
2) pass through particle filter through air sample after the cutting of predetermined aerodynamics equivalent grain size; Particle in the air sample is all filtered out; And then, obtain the concentration of gaseous state active nitrogen oxide through getting into nitrogen monoxide (NO) detecting device behind the molybdenum converter;
3) the active nitrogen oxide concentration of all gaseous states of step 1 and particle state is deducted the concentration of the gaseous state active nitrogen oxide of step 2, promptly obtain the concentration of the active nitrogen oxide in this aerodynamics equivalent grain size.
Described method, wherein, the aerodynamics equivalent grain size can be PM
1(being that particle aerodynamics equivalent grain size is less than 1 micron) is to PM
10Any specification of (being that particle aerodynamics equivalent grain size is less than 10 microns).
The device that is used to realize said method provided by the invention mainly comprises:
One aerodynamics equivalent grain size cutting head, first port of connection T-valve;
Two other port of T-valve connects the air intake opening and a filtrator of molybdenum converter respectively;
Filtrator is connected to the air intake opening of molybdenum converter;
The gas outlet of molybdenum converter connects the nitrogen monoxide detecting device.
Described device, wherein, aerodynamics equivalent grain size cutting head is PM
1To PM
10The cutting head of any specification.
Described device, wherein, T-valve is a three-way solenoid valve.
Described device, wherein, filtrator is the ultrafine particle filtering membrane below the 0.45 μ m of aperture.
Method and apparatus of the present invention can satisfy online test method and the device requirement to the particle state NOy of the various particle diameters of atmosphere effectively.
Description of drawings:
Fig. 1 is the structural representation of apparatus of the present invention.
Primary clustering symbol description in the accompanying drawing:
Aerodynamics equivalent grain size cutting head 1, three-way solenoid valve 2, ultrafine particle filtrator 3, molybdenum converter 4, NO detecting device 5.
Embodiment:
To combine accompanying drawing and embodiment that the present invention is done further explain below:
As shown in Figure 1, be device synoptic diagram of the present invention.
Pick-up unit of the present invention mainly is made up of aerodynamics equivalent grain size cutting head 1, three-way solenoid valve 2, ultrafine particle filtrator 3, molybdenum converter 4 and NO detecting device 5, and this device can accurately be measured the particle state NOy concentration in the Atmospheric particulates.The following technical scheme of concrete employing:
Aerodynamics equivalent grain size cutting head 1 connects a three-way solenoid valve 2; Two ports in addition of this three-way solenoid valve 2 respectively connect the air intake opening of molybdenum converter 4 and an end of ultrafine particle filtrator 3 respectively, and the other end of ultrafine particle filtrator 3 also is connected to the air intake opening of molybdenum converter 4.
Aerodynamics equivalent grain size cutting head 1 of the present invention can be PM
1To PM
10The cutting head of any specification, the present invention is with PM
2.5The particle diameter cutting head is an example.
Molybdenum converter of the present invention and NO detecting device are known device.
Gaseous sample of the present invention filters out predetermined PM through 1 pair of particle wherein of aerodynamics equivalent grain size cutting head
2.5Behind the particle, gaseous sample is divided into two gas circuits, and carries out any one tunnel gas circuit selection through three-way solenoid valve 2.Three-way solenoid valve 2 can alternative pass through two gas circuits, the one tunnel is directly to get into NO detecting devices 5 through molybdenum converter 4, obtains total NOy concentration value of gaseous state and particle state; Another road gas circuit is through ultrafine particle filtrator 3; All particles are all filtered out, get into NO detecting device 5 through molybdenum converter 4 again, obtain the concentration value of gaseous state NOy; Deduct the concentration value of gaseous state NOy by total NOy concentration value of gaseous state and particle state, just obtain PM
2.5The concentration value of particle state NOy.The conversion of three-way solenoid valve 2 in two gas circuits be by programmed control, thereby reach the purpose of on-line measurement particle state NOy.
The analytical procedure of concrete gaseous sample is following:
When detecting, the sampling pump work that the NO detecting device is inner, in air sample suction pick-up unit, at first surrounding air gets into PM
2.5Cutting head 1 filters out PM
2.5Following particle gets into a mouth of three-way solenoid valve 2, and this three-way solenoid valve 2 has two states, and a kind of a-b of being communicates, and a kind of a-c of being communicates.When a-b communicated, air sample filtered all particles fully through ultrafine particle filtrator 3, had only gaseous sample to get into molybdenum converter 4 backs and got into NO detecting device 5, and the NO value that NO detecting device 5 is measured just equals the value of gaseous state NOy.
Second kind of state of three-way solenoid valve 2 is that a-c communicates; This moment, air sample directly entered into molybdenum converter 4 without ultrafine particle filtrator 3, and the NOy species of airborne gaseous state and particle state all are converted into NO in molybdenum converter 4, enter into NO detecting device 5 then; Obtain the value of a total NOy; Through setting three-way solenoid valve 2 cycle controls, every 2-5 minute conversion one next state obtains two values of the total NOy of gaseous state NOy and gaseous state and particle state.General approximate think that in 10 minutes, therefore the not too big variation of airborne composition can use gaseous state and the total NOy value of particle state to deduct the value of gaseous state NOy, obtains the value of particle state NOy.Cycle detection through continuing can obtain online PM
2.5The detection data of middle NOy.
The above; Be merely the embodiment among the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with this technological people in the technical scope that the present invention disclosed; Can understand conversion or the replacement expected; All should be encompassed in of the present invention comprising within the scope, therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (6)
1. the method for the particle state active nitrogen oxide component in the Atmospheric particulates, its key step is:
1) passes through to get into the nitrogen monoxide detecting device behind the molybdenum converter through the air sample after the cutting of aerodynamics equivalent grain size, record the active nitrogen oxide concentration of all gaseous states and particle state;
2) particle in the air sample is all filtered out through particle filter through air sample after the cutting of aerodynamics equivalent grain size, and then, obtain the concentration of gaseous state active nitrogen oxide through getting into the nitrogen monoxide detecting device behind the molybdenum converter;
3) the active nitrogen oxide concentration of all gaseous states of step 1 and particle state is deducted the concentration of the gaseous state active nitrogen oxide of step 2, promptly obtain the concentration of the active nitrogen oxide in the aerodynamics equivalent grain size.
2. method according to claim 1, wherein, the aerodynamics equivalent grain size can be PM
1To PM
10Any specification.
3. device that is used to realize the said method of claim 1 mainly comprises:
One aerodynamics equivalent grain size cutting head, first port of connection T-valve;
Two other port of T-valve connects the air intake opening and a particle filter of molybdenum converter respectively;
Particle filter is connected to the air intake opening of molybdenum converter;
The gas outlet of molybdenum converter connects the nitrogen monoxide detecting device.
4. device according to claim 3, wherein, aerodynamics equivalent grain size cutting head is PM
1To PM
10The cutting head of any specification.
5. device according to claim 3, wherein, T-valve is a three-way solenoid valve.
6. device according to claim 3, wherein, filtrator is the ultrafine particle filtering membrane below the 0.45 μ m of aperture.
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| CN2012100774997A CN102721755A (en) | 2012-03-22 | 2012-03-22 | Method and apparatus for determining active nitrogen oxide component in particle state in atmosphere particle |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680371A (en) * | 2012-05-23 | 2012-09-19 | 中国科学院大气物理研究所 | Method and device for determining particle-state sulfide components in atmospheric particulates |
| CN103217330A (en) * | 2013-04-09 | 2013-07-24 | 安徽省安光环境光学工程技术研究中心有限公司 | Device for separating atmospheric particulates on line |
| CN103776910A (en) * | 2012-10-23 | 2014-05-07 | 中国石油化工股份有限公司 | Analysis system for nitrogen oxides in exhaust gas |
| CN105181851A (en) * | 2015-10-13 | 2015-12-23 | 神华集团有限责任公司 | Method for testing oxynitride in environment |
| CN105548507A (en) * | 2016-02-25 | 2016-05-04 | 河北先河环保科技股份有限公司 | Device and method for measuring sulfate in atmospheric particulates |
| CN108872033A (en) * | 2018-05-24 | 2018-11-23 | 香港理工大学深圳研究院 | The heterogeneous reaction activity measurement device and method of gaseous pollutant in atmospheric environment |
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| CN102252930A (en) * | 2011-06-02 | 2011-11-23 | 广东省环境监测中心 | Quasi constant weight weighing apparatus and method for monitoring mass concentration of atmospheric particulates by utilizing oscillation balance method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680371A (en) * | 2012-05-23 | 2012-09-19 | 中国科学院大气物理研究所 | Method and device for determining particle-state sulfide components in atmospheric particulates |
| CN103776910A (en) * | 2012-10-23 | 2014-05-07 | 中国石油化工股份有限公司 | Analysis system for nitrogen oxides in exhaust gas |
| CN103776910B (en) * | 2012-10-23 | 2015-06-17 | 中国石油化工股份有限公司 | Analysis system for nitrogen oxides in exhaust gas |
| CN103217330A (en) * | 2013-04-09 | 2013-07-24 | 安徽省安光环境光学工程技术研究中心有限公司 | Device for separating atmospheric particulates on line |
| CN105181851A (en) * | 2015-10-13 | 2015-12-23 | 神华集团有限责任公司 | Method for testing oxynitride in environment |
| CN105548507A (en) * | 2016-02-25 | 2016-05-04 | 河北先河环保科技股份有限公司 | Device and method for measuring sulfate in atmospheric particulates |
| CN108872033A (en) * | 2018-05-24 | 2018-11-23 | 香港理工大学深圳研究院 | The heterogeneous reaction activity measurement device and method of gaseous pollutant in atmospheric environment |
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Application publication date: 20121010 |