CN106290163B - Dinitrogen pentoxide and concentration of nitric acid on-line monitoring system and monitoring method in a kind of atmosphere - Google Patents
Dinitrogen pentoxide and concentration of nitric acid on-line monitoring system and monitoring method in a kind of atmosphere Download PDFInfo
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- CN106290163B CN106290163B CN201610580865.9A CN201610580865A CN106290163B CN 106290163 B CN106290163 B CN 106290163B CN 201610580865 A CN201610580865 A CN 201610580865A CN 106290163 B CN106290163 B CN 106290163B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
Abstract
The present invention provides dinitrogen pentoxide in a kind of atmosphere and concentration of nitric acid on-line monitoring system and methods.On-line monitoring system includes aerosol filtration unit, gas wet absorption conversion unit and optical absorption detection unit, the input end of aerosol filtration unit and atmosphere to be detected, for removing the particulate matter in gas, outlet end is divided into two-way and connect respectively with the first and second gas wet absorption conversion units, nitrogen compound in gas is absorbed as nitrate solution with acid absorbent solution, is further converted into nitrite；The front end of first gas wet absorption conversion unit is equipped with NO gas source, the N that will be passed through in gas2O5It is converted into NO2；The rear end of two gas wet absorption conversion units is connect with the first and second optical absorption detection units respectively, is the absorbent material with ultraviolet-visible by Nitrite transformation, and carry out optical detection；First optical absorption detection unit obtains removal N2O5Atmosphere concentration of nitric acid, the second optical absorption detection unit obtains atmosphere nitric acid and atmosphere N2O5Concentration and.
Description
Technical field
The present invention relates to atmosphere qualities to monitor field, and in particular in atmosphere dinitrogen pentoxide and concentration of nitric acid
Line monitoring system and method.
Background technique
Dinitrogen pentoxide (N2O5) as most important atmospheric oxidant in atmosphere night chemical process, in troposphere
Oxidant level and secondary particulate, which generate, has significant impact.The heterogeneous reaction of dinitrogen pentoxide high latitude in winter
Area is NOxMain removal pathway, furthermore can also influence global O3With the concentration of OH, but since it is with the low (1pptv- of concentration
1ppbv), reactivity is high, and easily the features such as pyrolysis makes detection in an atmosphere extremely difficult.Nitric acid (HNO3) it is nitrogen oxidation
The important oxidation product of object in an atmosphere, can be generated by radical reaction, while can also be by the hydrolysis of dinitrogen pentoxide
It generates, atmosphere nitrogen cycle can be influenced while passing through dried wet deposition influence global environment.China is existing for five oxygen in atmosphere
The on-line monitoring technique for changing phenodiazine and nitric acid also lacks very much.With combustion of fossil fuel in Urbanization in China and motor-driven
Vehicle discharge etc. increases, and nitrogen oxides is played in atmosphere pollution and more importantly acted on, the online prison of dinitrogen pentoxide and nitric acid
Survey technology is played an important role for understanding and solve China's atmosphere polluting problem in depth and meaning.
Summary of the invention
The present invention provides dinitrogen pentoxide in a kind of atmosphere and concentration of nitric acid on-line monitoring system and methods.The monitoring system
System and method are to be realized based on modes such as wet absorption, chemical conversion and optical absorptions to dinitrogen pentoxide in atmosphere and nitric acid
While measure, while the interference of other gaseous substances can be eliminated by parallel channels.System is equipped with dinitrogen pentoxide mark
Quasi- concentration cell demarcates system as standard sample.The system and method both can be used for atmosphere environment supervision, together
When can also be used for experimental science research etc..
The technical solution adopted by the invention is as follows:
Dinitrogen pentoxide and concentration of nitric acid on-line monitoring system in a kind of atmosphere, including aerosol filtration unit, gas are wet
Formula sorption enhanced unit and optical absorption detection unit；Aerosol filtration unit is used to remove the particulate matter in atmosphere to be detected；
Gas wet absorption conversion unit is for being absorbed as nitric acid for the nitrogen compound in the gas of entrance with acid absorbent solution first
Salting liquid is further converted into nitrite；Optical absorption detection unit will be for that will come from gas wet absorption conversion unit
Nitrite transformation be the absorbent material with ultraviolet-visible, and carry out optical detection；Wherein, atmosphere and gas to be detected
The input end of colloidal sol filter element is connected to, and the outlet end of aerosol filtration unit is divided into two-way, is inhaled respectively with first gas wet type
It receives conversion unit to connect with second gas wet absorption conversion unit, the front end of first gas wet absorption conversion unit is also set
There is NO gas source, the N for that will be passed through in gas2O5It is converted into NO2, the rear end and first of first gas wet absorption conversion unit
The connection of optical absorption detection unit, the rear end of second gas wet absorption conversion unit and the second optical absorption detection unit connect
It connects, the first optical absorption detection unit obtains removal N2O5Atmosphere concentration of nitric acid, the second optical absorption detection unit obtains big
Gas nitric acid and atmosphere N2O5Concentration and.
Further, first gas wet absorption conversion unit includes the first absorption tube and the first crossover connection, second gas
Wet absorption conversion unit includes the second absorption tube and the second crossover connection, and acid absorbent solution (such as aqueous sulfuric acid) is led to
Enter the first absorption tube and the second absorption tube, carry out blended absorbent with gas, then respectively enters the first crossover connection and the second conversion
Pipe, is converted into nitrite.It is preferred that the first absorption tube and/or the second absorption tube are spiral tube structure or straight type pipe structure.Into
One step, temperature control unit is equipped with outside the first absorption tube and/or the second absorption tube.It is preferred that the first absorption tube and/or
Two absorption tubes are sequentially connected with dehumidifier, flow controller and aspiration pump.Further preferably, the dehumidifier is using glass, no
Become rusty steel or plastic material, and inside filling includes dry silica gel, calcium carbonate and sodium carbonate；The aspiration pump uses mechanical pump, diaphragm
Pump or piston pump.It is preferred that the first crossover connection and/or the second crossover connection are cadmium reduction column.
Further, the first optical absorption detection unit includes the first absorption cell, and the second optical absorption detection unit includes
The mixed solution of sulfanilyl ammonium and N- (1- naphthalene)-ethylenediamine is passed through the first absorption cell and second by the second absorption cell
Absorption cell, the Asia converted respectively with first gas wet absorption conversion unit and second gas wet absorption conversion unit
Nitrate mixing, generates the substance with ultraviolet-ray visible absorbing, and the light that light source issues enters the first absorption cell and second and absorbs
Pond is detected by detector.It is preferred that the light source 11 can use halogen lamp, LED light or xenon lamp, output area 200nm-
1000nm.It is preferred that the first absorption cell and/or the second absorption cell are silica cuvette or liquid fiber absorption cell, absorbing light path is
1 centimetre -5 meters.It is preferred that the detector is diode or CCD detector, preferably multi-channel detector.
Further, which further includes dinitrogen pentoxide normal concentration unit, when system calibrating, by five oxygen
Change the N that phenodiazine normal concentration unit provides2O5It is passed through aerosol filtration unit.Preferably, the dinitrogen pentoxide normal concentration
Unit includes O2Or air high-pressure air source, NO2High-pressure air source, flow controller, photodissociation chamber and mixing chamber, photodissociation is intracavitary to be equipped with purple
Outer lamp, O2Or the gas of air high-pressure air source output enters photodissociation chamber through flow controller, and ultraviolet light is passed through in photodissociation chamber
Solution generates quantitative ozone, NO2High-pressure air source is connect with flow controller, and the ozone come out with photodissociation chamber mixes, into mixing
Then room is connect with aerosol filtration unit.It is preferred that the photodissociation chamber be quartz or glass material, length 1cm-50cm,
Caliber 1cm-20cm.It is preferred that the ultraviolet lamp uses launch wavelength for 185nm or 254nm fluorescent tube.It is preferred that the mixing chamber material
Matter is glass or quartz, volume 5mL-5L.
Further, the aerosol filtration unit is filter membrane or particles collision removing component, and preferably filter membrane material is stone
English, glass fibre or polytetrafluoroethylene (PTFE), filter sizes are 0.002 μm -100 μm.
Further, which exports absorbing liquid to the first absorption tube and the second absorption tube using infusion pump respectively, and
The mixed solution of sulfanilyl ammonium and N- (1- naphthalene)-ethylenediamine is exported respectively to the first absorption cell and the second absorption cell.
It is preferred that the infusion pump uses peristaltic pump, high voltage and constant current infusion pump or micro syringe.Further preferably, which is more
The output of road rear pump, the more preferably road 4-20.
Further, which further includes the parallel channels eliminating interfering substance and influencing, and the parallel channels include two
Absorption tube, two crossover connections, two absorption cells, infusion pump, light source and detector, absorption tube, crossover connection in parallel channels,
In absorption cell, the connection type of infusion pump and detector and gas wet absorption conversion unit and optical absorption detection unit
The connection of corresponding component and the method for operation are identical, and the first absorption tube and the second absorption tube are absorbed with two of parallel channels respectively
Pipe connection,
Further, which can also further increase one or more parallel channels, the absorption in multiple parallel channels
Pipe is connect with the absorption tube of previous parallel channels.
Further, which further includes computer control unit, for controlling the intensity of light source, flow controller
Uninterrupted, the output flow of infusion pump and the detection data of acquisition testing device.
According to another aspect of the present invention, dinitrogen pentoxide and concentration of nitric acid on-line monitoring side in a kind of atmosphere are also provided
Method includes the following steps:
(1) filtering removes Atmospheric Grains to be detected；
(2) nitrogen compound in the gas of filtering removal particulate matter is absorbed as nitrate solution with acid absorbent solution,
Further it is converted into nitrite；
(3) it is the absorbent material with ultraviolet-visible by Nitrite transformation, then carries out optical detection；
Wherein, after atmosphere filtering removal particulate matter to be detected, it is divided into two-way, is mixed all the way with NO, by the N in gas2O5Turn
Turn to NO2, it is then passed through first gas wet absorption conversion unit again, conversion obtains nitrite, is further converted into tool
There is the absorbent material of ultraviolet-visible to carry out optical detection, obtains removal N2O5Atmosphere concentration of nitric acid；Another way is passed directly into
Second gas wet absorption conversion unit is converted into nitrite, is further converted into the absorbability object with ultraviolet-visible
Matter carries out optical detection, obtains atmosphere nitric acid and atmosphere N2O5Concentration and.It is preferred that the flow control that is passed through of NO is 1ml/min
~500L/min.
Further, first gas wet absorption conversion unit includes the first absorption tube and the first crossover connection, second gas
Wet absorption conversion unit includes the second absorption tube and the second crossover connection, and acid absorbent solution (such as aqueous sulfuric acid) is led to
Enter the first absorption tube and the second absorption tube, carry out blended absorbent with gas, then respectively enters the first crossover connection and the second conversion
Pipe, is converted into nitrite.It is preferred that being equipped with temperature control unit, temperature control outside the first absorption tube and/or the second absorption tube
It is made as 15-45 DEG C.It is preferred that the first absorption tube and/or the second absorption tube successively connect with dehumidifier, flow controller and aspiration pump
It connects, carries out sensing chamber, open aspiration pump, set flow controller, atmosphere to be detected is made to enter gas wet absorption after filtering
Conversion unit, the flow control of further preferred flow controller are 1ml/min~500L/min, speed of evacuation 1ml/min
~500L/min.It is preferred that the first crossover connection and/or the second crossover connection are cadmium reduction column.
Further, the first optical absorption detection unit includes the first absorption cell, and the second optical absorption detection unit includes
The mixed solution of sulfanilyl ammonium and N- (1- naphthalene)-ethylenediamine is passed through the first absorption cell and second by the second absorption cell
Absorption cell, the Asia converted respectively with first gas wet absorption conversion unit and second gas wet absorption conversion unit
Nitrate mixing, generates the substance with ultraviolet-ray visible absorbing, and the light that light source issues enters the first absorption cell and second and absorbs
Pond is detected by detector.It is preferred that the output area of the light source is 200nm-1000nm, the absorption light path of absorption cell is 1 li
- 5 meters of rice.
Further, it is demarcated using the dinitrogen pentoxide of normal concentration, by the N of normal concentration2O5Enter after filtering
Gas wet absorption conversion unit.Preferably, the N of the normal concentration2O5It is generated by dinitrogen pentoxide normal concentration unit, it should
Dinitrogen pentoxide normal concentration unit includes O2Or air high-pressure air source 20, NO2High-pressure air source 21, flow controller, photodissociation chamber
And mixing chamber, photodissociation is intracavitary to be equipped with ultraviolet lamp, O2Or the gas that air high-pressure air source 20 exports enters photodissociation through flow controller
Chamber generates quantitative ozone, NO by ultraviolet lamp photodissociation in photodissociation chamber2High-pressure air source 21 is connect with flow controller, with photodissociation
The ozone mixing that chamber comes out, into mixing chamber 25, i.e. reaction generates N2O5.It is preferred that O2Or air high-pressure air source 20, NO2High pressure
The flow of gas source output gas is 1ml/min~500L/min.
Further, filtering removes Atmospheric Grains to be detected in step (1), using filter membrane or particles collision removal portion
Part, preferably filter membrane material are quartz, glass fibre or polytetrafluoroethylene (PTFE), and filter sizes are 0.002 μm -100 μm.
Further, absorbing liquid is exported in this method to the first absorption tube and the second absorption tube, and output p-aminophenyl
The mixed solution of sulphonyl ammonium and N- (1- naphthalene)-ethylenediamine is to the first absorption cell and the second absorption cell, wherein liquid feed flow
For 1 μ L/min~500L/min.
Further, this method uses parallel channels also to eliminate the parallel channels of interfering substance influence, described parallel logical
Road includes two absorption tubes, two crossover connections, two absorption cells, infusion pump, light source and detector, the absorption in parallel channels
The connection type and gas wet absorption conversion unit and optical absorption of pipe, crossover connection, absorption cell, infusion pump and detector
The connection of corresponding component and the method for operation are identical in detection unit.First absorption tube and the second absorption tube respectively with parallel channels
The connection of two absorption tubes, two of parallel channels are not respectively enterd by the gas that the first absorption tube and the second absorption tube absorb
Absorption tube.
Further, this method can also further increase one or more parallel channels, the absorption in multiple parallel channels
Pipe is connect with the absorption tube of previous parallel channels.
Further, in the on-line monitoring method, the control and detector detection data of process conditions are carried out using computer
Acquisition.It is preferred that using computer control the intensity of light source, the uninterrupted of flow controller, infusion pump output flow and adopt
Collect the detection data of detector.
The beneficial effects of the present invention are:
1. measurement while to dinitrogen pentoxide in atmosphere and nitric acid may be implemented in the monitoring system and method, while may be used also
To eliminate the interference of other gaseous substances by parallel channels.
2. the trace detection to dinitrogen pentoxide in atmosphere and nitric acid may be implemented in the monitoring system and method, detect sensitive
Degree is better than 5pptv, and detection maximum concentration is 10ppm, and the response time was less than 2 minutes
3. the monitoring system is equipped with dinitrogen pentoxide normal concentration unit, it can be used as standard sample and system marked
It is fixed.
4. the monitoring system and method both can be used for atmosphere environment supervision, it simultaneously can be used for the sides such as experimental science research
Face.
Detailed description of the invention
Fig. 1 is the flow diagram of dinitrogen pentoxide and concentration of nitric acid on-line monitoring system.
Fig. 2 is the parallel channels schematic diagram eliminating interfering substance and influencing.
Description of symbols:
1, aerosol filtration unit；2, the first absorption tube；3, dehumidifier；4, flow controller；5, aspiration pump；6, second
Absorption tube；7, dehumidifier；8, flow controller；9, aspiration pump；10, infusion pump；11, light source；12, the first absorption cell；13,
Two absorption cells；14, detector；15, the second crossover connection；16, the first crossover connection；17, computer；18, NO high-pressure air source；19, flow
Controller；20,O2Or air high-pressure air source；21,NO2High-pressure air source；22, flow controller；23, flow controller；24, photodissociation
Chamber；25, mixing chamber；26, ultraviolet lamp；27, third absorption tube；28, the 4th absorption tube；29, infusion pump；30, third absorption cell；
31, the 4th absorption cell；32, detector；33, light source；34, third crossover connection；35, the 4th crossover connection
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and examples, but the invention is not limited to following implementations
Example.
As shown in Figure 1, the present invention provides dinitrogen pentoxide in a kind of atmosphere and concentration of nitric acid on-line monitoring systems, including
Aerosol filtration unit, gas wet absorption conversion unit, optical absorption detection unit and dinitrogen pentoxide normal concentration list
Member.
Wherein, aerosol filtration unit 1 is filter membrane component, for removing the particulate matter in atmosphere to be detected, filter membrane material
For quartz, glass fibre or polytetrafluoroethylene (PTFE), filter sizes 0.002um-100um.
Gas wet absorption conversion unit includes the first absorption tube 2, the first crossover connection 16, the second absorption tube 6 and second turn
Change pipe 15.Atmosphere to be detected through aerosol filtration unit filter membrane component 1 remove particle after, be divided into two-way by threeway, respectively into
Enter the first absorption tube 2 and the second absorption tube 6.It can be using water circulation or semiconductor refrigerating and heating outside absorption tube 2 and 6
The modes such as band control temperature, and temperature range is 15 DEG C -45 DEG C.Absorption tube 2 and 6 further respectively with dehumidifier 3 and 7, flow control
Device 4 and 8 processed, aspiration pump 5 and 9 are sequentially connected.NO high-pressure air source 18 connects flow controller 19, then accesses the by threeway
One absorption tube 2 is used for N2O5It is converted into NO2.The crossover connection 16 and 15 is cadmium reduction column, is filled using cadmium pearl.
Optical absorption detection unit includes the first absorption cell 12, the second absorption cell 13, light source 11 and detector 14.Infusion pump
10 pump for multiple-channel output, and output absorbs liquid to absorption tube 2 and 6, output sulfanilyl ammonium and N- (1- naphthalene)-respectively
The solution of ethylenediamine is to absorption cell 12 and 13.The liquid for absorbing gaseous substance is flowed out from absorption tube 2 and 6, respectively enters crossover connection
16 and 15, nitrogen compound therein is converted into nitrite.Further, the sulfanilyl ammonium exported with infusion pump 10
It is mixed with the solution of N- (1- naphthalene)-ethylenediamine, generates the substance with ultraviolet-ray visible absorbing, respectively enter 12 He of absorption cell
13, the light that light source 11 issues enters absorption cell 12 and 13 by optical fiber or optical mirror slip group, then passes through optical fiber or optical frames again
Piece group is collected by detector 14, is finally entered computer 17 and is carried out data processing.
Dinitrogen pentoxide normal concentration unit includes oxygen or air high-pressure air source 20, NO2 high-pressure air source 21, flow control
Device 22, flow controller 23, photodissociation chamber 24, mixing chamber 25, ultraviolet lamp 26, high-pressure air source 20 are connect with flow controller 22,
It is passed through photodissociation chamber 24, oxygen or air and generates quantitative ozone under 26 photodissociation of ultraviolet lamp.High-pressure air source 21 and flow controller 23
Connection, the ozone come out with photodissociation chamber 24 mixes, and into mixing chamber 25, is then connected by threeway and aerosol filtration unit 1
It connects.
In on-line monitoring system of the invention, flow controller 4,8,19,22 and 23 can use mass flowmenter, float
Flowmeter, needle-valve or proportion magnetic valve, flow are 1 milliliter per minute to 500 Liter Per Minutes.Infusion pump 10 can be using wriggling
Pump, high voltage and constant current infusion pump or micro syringe, flow are 1 microlitre per minute to 100 milliliters per minute, and 4 to 20 tunnel multichannels are defeated
Out.Absorption tube 2 and 6 can use spiral tube structure or straight type pipe structure, helix tube caliber 1mm-10mm, length 10mm-
200mm；Straight type pipe caliber range 1mm-100mm, length 10mm-200mm.Dehumidifier 3 and 7 is using glass, stainless steel or modeling
Expect material, inside filling includes dry silica gel, calcium carbonate and sodium carbonate.Aspiration pump 5 and 9 can using mechanical pump, diaphragm pump or
Piston pump, the speed of evacuation are 1 milliliter per minute to 500 Liter Per Minutes.Light source 11 can use halogen lamp, LED light or xenon lamp,
Output area is 200nm-1000nm.Absorption cell 12 and 13 uses silica cuvette or liquid fiber absorption cell, absorbs light path and is
1 centimetre -5 meters.Detector 14 is diode or CCD detector, is multi-channel detector, and quantity is 1-10.Photodissociation chamber 24 is stone
English or glass material, length 1cm-50cm, caliber 1cm-20cm.Ultraviolet lamp 26 uses launch wavelength for 185nm or 254nm
Fluorescent tube.25 material of mixing chamber is glass or quartz, volume 5mL-5L.
Correspondingly, the present invention provides dinitrogen pentoxide in a kind of atmosphere and concentration of nitric acid on-line monitoring methods.
When being detected, aspiration pump 5 and 9 is opened, two-way flow controller 4 and 8 is set, makes atmosphere from aerosol filtration list
The front end of member 1 enters system and is divided into two-way by threeway after gas removes particulate matter by aerosol filtration unit 1, respectively
Into the first absorption tube 2 and the second absorption tube 6.High-pressure air source 18 is opened, flow controller 19 is set, nitric oxide standard gas
Before being passed through absorption tube 2, to convert the N of 2 branch of absorption tube2O5.Infusion pump 10 is opened, acid absorbent solution is passed through the respectively
One absorption tube 2 and the second absorption tube 6.Into the first absorption tube 2 liquid and entrance gas carry out blended absorbent, then into
Enter the first crossover connection 16, is translated into nitrite anions, the sulfanilyl ammonium and N- (1- naphthalene then exported with infusion pump 10
Base)-ethylenediamine solution mixing, generate have ultraviolet-ray visible absorbing substance, into the first absorption cell 12.Light source 11 issues
Light enter the first absorption cell 12, and detected by detector 14, data then acquired using computer 17.Into the second absorption tube 6
Liquid and the another way gas of entrance carry out blended absorbent and subsequently into the second crossover connection 15 be translated into nitrite anions,
Then the sulfanilyl ammonium and the solution of N- (1- naphthalene)-ethylenediamine exported with infusion pump 10 mix, generate with it is ultraviolet-
The substance of visible absorbance, into the second absorption cell 13.The light that light source 11 issues enters the second absorption cell 13, and by detector 14
Then detection acquires data using computer 17.The acquisition of first absorption tube 2 is removal N2O5Atmosphere concentration of nitric acid, second inhale
Closed tube 6 obtains atmosphere nitric acid and atmosphere N2O5Concentration and.
When needing to calibrate, high-pressure air source 20 and 21 is opened, the gas exported from high-pressure air source 20, by flow controller
22, into photodissociation chamber 24, ozone is generated by 26 photodissociation of ultraviolet lamp in photodissociation chamber, is exported with process flow controller 23
Nitrogen dioxide mixes in mixing chamber 25, is demarcated then into the injection port before aerosol filtration unit 1.
Computer 17 can control 11 intensity of light source, the uninterrupted and infusion pump of flow controller 4,8,19,22,23
11 output flow.
Existing absorption tube 2 and 6 two in the present invention, by absorption tube 2 and 6, crossover connection 16 and 15, absorption cell 12 and 13, defeated
Liquid pump 10, light source 11, detector 14 constitute absorption detecting channel, and as needed, the present invention can also increase for eliminating interference
The parallel channels that substance influences.Such as NO2It is smaller in the solubility in acid absorbent solution but can in absorption tube 2 into
Row absorbs, therefore using the absorption detecting equipment for increasing by one group of absorption tube and its connection, later group absorption tube after absorption tube 2
NO is contained in the result measured2Interference, can effectively deduct its NO with its result2Result is arrived to what absorption tube 2 detected
It influences, to remove interference.The configuration of absorption cell and subsequent detection is similar with existing system.This kind of parallel channels can be used for
Deduct the influence of other interfering substances.
As shown in Fig. 2, the elimination interfering substance influence parallel channels include two absorption tubes 27 and 28, and with the suction
The matching used crossover connection 34 and 35 of closed tube, absorption cell 30 and 31, infusion pump 29, light source 33, detector 32, in parallel channels
Absorption tube, crossover connection, absorption cell, infusion pump, light source and detector connection and mode of operation and absorption detecting channel in
Corresponding component it is identical.Third absorption tube 27 is set between the first absorption tube 2 and dehumidifier 3, is not absorbed by the first absorption tube
Gas enter third absorption tube 27, between the first absorption tube 6 and dehumidifier 7 be arranged the 4th absorption tube 28, not by second inhale
The gas that closed tube absorbs enters the 4th absorption tube 28, opens infusion pump 29, acid absorbent solution is passed through third absorption tube respectively
27 and the 4th absorption tube 28, after gas-liquid mixed absorbs in third absorption tube 27 and the 4th absorption tube 28, respectively enter third conversion
Pipe 34 and the 4th crossover connection 35, then the solution with the sulfanilyl ammonium of the output of infusion pump 29 and N- (1- naphthalene)-ethylenediamine
Mixing, respectively enters third absorption cell 30 and the 4th absorption cell 31.The light that light source 33 issues enters third absorption cell 30 and the 4th
Absorption cell 31, and detected by detector 32.The result of the interference of parallel channels detection is used to deduct the detection in absorption tube 1 and 2
As a result, to obtain glitch-free signal.
As needed, multiple above-mentioned parallel passage structures, the previous suction on increased absorption tube and channel can also be increased
Closed tube connection.Dinitrogen pentoxide and concentration of nitric acid on-line monitoring system and method, are related to marking in a kind of atmosphere provided by the invention
Quasi- concentration N2O5Gas generation, aerosol filtration, gas wet absorption, pumping speed control, liquid phase chemical conversion, chemical derivatization, light
The processes such as absorption and computer control are learned, realize that the trace detection to dinitrogen pentoxide in atmosphere and nitric acid, detection sensitivity are excellent
In 5pptv, detection maximum concentration is 10ppm, and the response time was less than 2 minutes.
More than, embodiments of the present invention are illustrated.But the present invention is not limited to above embodiment.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (46)
1. dinitrogen pentoxide and concentration of nitric acid on-line monitoring system in a kind of atmosphere, including aerosol filtration unit, gas wet type
Sorption enhanced unit and optical absorption detection unit, aerosol filtration unit are used to remove the particulate matter in atmosphere to be detected, gas
Body wet absorption conversion unit is used to the nitrogen compound in the gas entered being absorbed as nitrate with acidity absorbent solution first
Solution is further converted into nitrite, and optical absorption detection unit is used for will be from gas wet absorption conversion unit
Nitrite transformation is the absorbent material with ultraviolet-visible, and carries out optical detection, which is characterized in that atmosphere to be detected
It is connected to the input end of aerosol filtration unit (1), the outlet end of aerosol filtration unit (1) is divided into two-way, respectively with first
Gas wet absorption conversion unit is connected with second gas wet absorption conversion unit, first gas wet absorption conversion unit
Front end is additionally provided with NO gas source, the N for that will be passed through in gas2O5It is converted into NO2, after first gas wet absorption conversion unit
End is connect with the first optical absorption detection unit, and the rear end of second gas wet absorption conversion unit and the second optical absorption detect
Unit connection, the first optical absorption detection unit obtain removal N2O5Atmosphere concentration of nitric acid, the second optical absorption detection unit obtains
Obtain atmosphere nitric acid and atmosphere N2O5Concentration and.
2. on-line monitoring system as described in claim 1, which is characterized in that first gas wet absorption conversion unit includes the
One absorption tube (2) and the first crossover connection (16), second gas wet absorption conversion unit include the second absorption tube (6) and second turn
Pipe (15) are changed, acid absorbent solution is passed through the first absorption tube (2) and the second absorption tube (6), carry out blended absorbent with gas, so
After respectively enter the first crossover connection (16) and the second crossover connection (15), be converted into nitrite.
3. on-line monitoring system as claimed in claim 2, which is characterized in that the acidity absorbent solution is sulfuric acid solution.
4. on-line monitoring system as claimed in claim 2, which is characterized in that the first absorption tube and/or the second absorption tube are spiral shell
Coil configuration or straight type pipe structure.
5. on-line monitoring system as claimed in claim 2, which is characterized in that outside the first absorption tube and/or the second absorption tube
Equipped with temperature control unit.
6. on-line monitoring system as claimed in claim 5, which is characterized in that the temperature control unit is using water circulation or half
Conductor refrigeration or the mode of heating tape.
7. such as the described in any item on-line monitoring systems of claim 2-6, which is characterized in that the first absorption tube and/or the second suction
Closed tube is sequentially connected with dehumidifier, flow controller and aspiration pump.
8. on-line monitoring system as claimed in claim 7, which is characterized in that the dehumidifier uses glass, stainless steel or modeling
Expect material, inside filling includes dry silica gel, calcium carbonate and sodium carbonate；The aspiration pump uses mechanical pump, diaphragm pump or piston
Pump.
9. such as the described in any item on-line monitoring systems of claim 2-6, which is characterized in that the first crossover connection and/or second turn
Changing pipe is cadmium reduction column.
10. on-line monitoring system as claimed in claim 1 or 2, which is characterized in that the first optical absorption detection unit includes the
One absorption cell (12), the second optical absorption detection unit includes the second absorption cell (13), by P-aminobenzene-sulfonamide and N- (1- naphthalene
Base) mixed solution of-ethylenediamine is passed through the first absorption cell and the second absorption cell, respectively with first gas wet absorption conversion unit
The nitrite mixing converted with second gas wet absorption conversion unit, generates the substance with ultraviolet-ray visible absorbing,
The light that light source (11) issues enters the first absorption cell (12) and the second absorption cell (13), is detected by detector (14).
11. on-line monitoring system as claimed in claim 10, which is characterized in that the light source (11) uses halogen lamp, LED light
Or xenon lamp, output area 200nm-1000nm.
12. on-line monitoring system as claimed in claim 10, which is characterized in that the first absorption cell and/or the second absorption cell are
Silica cuvette or liquid fiber absorption cell, absorbing light path is 1 centimetre -5 meters.
13. on-line monitoring system as claimed in claim 10, which is characterized in that the detector is that diode or CCD are detected
Device.
14. on-line monitoring system as claimed in claim 10, which is characterized in that the detector is multi-channel detector.
15. on-line monitoring system as claimed in claim 1 or 2, which is characterized in that the aerosol filtration unit be filter membrane or
Particles collision removing component.
16. on-line monitoring system as claimed in claim 15, which is characterized in that filter membrane material is quartz, glass fibre or poly-
Tetrafluoroethene, filter sizes are 0.002 μm -100 μm.
17. on-line monitoring system as claimed in claim 1 or 2, which is characterized in that the system comprises multiple-channel output infusion pumps
(10), which exports absorbing liquid to the first absorption tube and the second absorption tube respectively, and exports p-aminophenyl respectively
The mixed solution of sulfonamide and N- (1- naphthalene)-ethylenediamine is to the first absorption cell and the second absorption cell.
18. on-line monitoring system as claimed in claim 17, which is characterized in that the infusion pump is permanent using peristaltic pump, high pressure
Flow infusion pump or micro syringe.
19. on-line monitoring system as claimed in claim 18, which is characterized in that the infusion pump is the output of the road 4-20.
20. on-line monitoring system as claimed in claim 1 or 2, which is characterized in that the system also includes computer control is single
Member.
21. on-line monitoring system as claimed in claim 20, which is characterized in that the computer control unit is for controlling light source
The detection data of intensity, the uninterrupted of flow controller, the output flow of infusion pump and acquisition testing device.
22. on-line monitoring system as claimed in claim 1 or 2, which is characterized in that the on-line monitoring system further includes five oxygen
Change phenodiazine normal concentration unit, when system calibrating, N that dinitrogen pentoxide normal concentration unit is provided2O5It is passed through aerosol filtration
Unit (1).
23. on-line monitoring system as claimed in claim 21, which is characterized in that the dinitrogen pentoxide normal concentration unit packet
Include oxygen or air high-pressure air source (20), NO2High-pressure air source (21), flow controller (22,23), photodissociation chamber (24) and mixing chamber
(25), ultraviolet lamp (26) are equipped in photodissociation chamber (24), the gas of oxygen or air high-pressure air source (20) output is through flow controller
(22) enter photodissociation chamber (24), generate quantitative ozone, NO by ultraviolet lamp (26) photodissociation in photodissociation chamber (24)2High-pressure air source
(21) it is connect with flow controller (23), the ozone come out with photodissociation chamber (24) mixes, then molten with gas into mixing chamber (25)
Glue filter element (1) connection.
24. on-line monitoring system as claimed in claim 23, which is characterized in that the photodissociation chamber (24) is quartz or glass material
Matter, length 1cm-50cm, caliber 1cm-20cm.
25. on-line monitoring system as claimed in claim 23, which is characterized in that the ultraviolet lamp (26) use launch wavelength for
185nm or 254nm fluorescent tube.
26. on-line monitoring system as claimed in claim 23, which is characterized in that mixing chamber (25) material be glass or
Quartz, volume 5mL-5L.
27. on-line monitoring system as claimed in claim 1 or 2, which is characterized in that the system also includes eliminate interfering substance
The parallel channels of influence, the parallel channels include two absorption tubes, two crossover connections, two absorption cells, infusion pump, light source and
Detector, the connection type and gas wet type of absorption tube, crossover connection, absorption cell, infusion pump and detector in parallel channels
The connection of sorption enhanced unit and corresponding component in optical absorption detection unit and the method for operation are identical, the first absorption tube and second
Absorption tube is connect with two absorption tubes of parallel channels respectively.
28. on-line monitoring system as claimed in claim 1 or 2, which is characterized in that can also be further increased in the system
One or more parallel channels, the absorption tube in multiple parallel channels are connect with the absorption tube of previous parallel channels.
29. dinitrogen pentoxide and concentration of nitric acid on-line monitoring method, include the following steps: in a kind of atmosphere
(1) filtering removes Atmospheric Grains to be detected；
(2) nitrogen compound in the gas of filtering removal particulate matter is absorbed as nitrate solution with acid absorbent solution, then into
One step is converted into nitrite；
(3) it is the absorbent material with ultraviolet-visible by Nitrite transformation, then carries out optical detection；
It is characterized in that, being divided into two-way after atmosphere filtering removal particulate matter to be detected, being mixed all the way with NO, by the N in gas2O5
It is converted into NO2, it is then passed through first gas wet absorption conversion unit again, conversion obtains nitrite, is further converted into
Absorbent material with ultraviolet-visible carries out optical detection, obtains removal N2O5Atmosphere concentration of nitric acid；Another way is directly logical
Enter second gas wet absorption conversion unit and be converted into nitrite, is further converted into the absorbability with ultraviolet-visible
Substance carries out optical detection, obtains atmosphere nitric acid and atmosphere N2O5Concentration and.
30. on-line monitoring method as claimed in claim 29, which is characterized in that the acidity absorbent solution is sulfuric acid solution.
31. on-line monitoring method as claimed in claim 29, which is characterized in that NO be passed through flow control be 1mL/min~
500L/min。
32. on-line monitoring method as claimed in claim 29, which is characterized in that first gas wet absorption conversion unit includes
First absorption tube and the first crossover connection, second gas wet absorption conversion unit include the second absorption tube and the second crossover connection, will
Acid absorbent solution is passed through the first absorption tube and the second absorption tube, carries out blended absorbent with gas, then respectively enters first turn
Pipe and the second crossover connection are changed, nitrite is converted into.
33. on-line monitoring method as claimed in claim 32, which is characterized in that outside the first absorption tube and/or the second absorption tube
Portion is equipped with temperature control unit, and temperature control is 15-45 DEG C.
34. on-line monitoring method as claimed in claim 32, which is characterized in that the first crossover connection and/or the second crossover connection are
Cadmium reduction column.
35. on-line monitoring method as claimed in claim 32, which is characterized in that the first absorption tube and/or the second absorption tube with
Dehumidifier, flow controller and aspiration pump are sequentially connected, and when being detected, are opened aspiration pump, are set flow controller, make to be checked
It surveys atmosphere and enters gas wet absorption conversion unit after filtering.
36. on-line monitoring method as claimed in claim 35, which is characterized in that the speed of evacuation is 1mL/min~500L/min.
37. such as the described in any item on-line monitoring methods of claim 29-36, which is characterized in that the two-way is respectively adopted the
One optical absorption detection unit and the second optical absorption detection unit carry out optical detection；Wherein, the detection of the first optical absorption is single
Member includes the first absorption cell, and the second optical absorption detection unit includes the second absorption cell, by P-aminobenzene-sulfonamide and N- (1- naphthalene
Base) mixed solution of-ethylenediamine is passed through the first absorption cell and the second absorption cell, respectively with first gas wet absorption conversion unit
The nitrite mixing converted with second gas wet absorption conversion unit, generates the substance with ultraviolet-ray visible absorbing,
The light that light source issues enters the first absorption cell and the second absorption cell, is detected by detector.
38. on-line monitoring method as claimed in claim 37, which is characterized in that the output area of the light source is 200nm-
1000nm, the absorption light path of absorption cell are 1 centimetre -5 meters.
39. on-line monitoring method as claimed in claim 29, which is characterized in that export absorbing liquid in the method to the first suction
Closed tube and the second absorption tube, and output P-aminobenzene-sulfonamide and N- (1- naphthalene)-ethylenediamine mixed solution to first inhale
Receives pond and the second absorption cell, wherein liquid feed flow is 1 μ L/min~500L/min.
40. on-line monitoring method as claimed in claim 29, which is characterized in that in the on-line monitoring method, using computer
Carry out the control of process conditions and the acquisition of detector detection data.
41. on-line monitoring method as claimed in claim 40, which is characterized in that control the intensity of light source, flow control using computer
The detection data of the uninterrupted of device processed, the output flow of infusion pump and acquisition testing device.
42. on-line monitoring method as claimed in claim 29, which is characterized in that carried out using the dinitrogen pentoxide of normal concentration
Calibration, by the N of normal concentration2O5Enter gas wet absorption conversion unit after filtering.
43. on-line monitoring method as claimed in claim 42, which is characterized in that the N of the normal concentration2O5By five oxidations two
Nitrogen normal concentration unit generates, and the dinitrogen pentoxide normal concentration unit includes oxygen or air high-pressure air source (20), NO2It is high
Pressurized air source (21), flow controller (22,23), photodissociation chamber (24) and mixing chamber (25), photodissociation chamber (24) is interior to be equipped with ultraviolet lamp
(26), oxygen or the gas of air high-pressure air source (20) output enter photodissociation chamber (24) through flow controller (22), in photodissociation chamber
(24) quantitative ozone, NO are generated by ultraviolet lamp (26) photodissociation in2High-pressure air source (21) is connect with flow controller (23), with light
The ozone mixing that chamber (24) come out is solved, into mixing chamber (25), i.e. reaction generates N2O5。
44. on-line monitoring method as claimed in claim 43, which is characterized in that oxygen or air high-pressure air source, NO2High pressure gas
The flow of source output gas is 1mL/min~500L/min.
45. on-line monitoring method as claimed in claim 29, which is characterized in that the method also uses parallel channels to eliminate
Interfering substance influences, and the parallel channels include two absorption tubes, two crossover connections, two absorption cells, infusion pump, light source and inspection
Device is surveyed, the connection type and gas wet type of absorption tube, crossover connection, absorption cell, infusion pump and detector in parallel channels are inhaled
It is identical to receive connection and the method for operation of the conversion unit with corresponding component in optical absorption detection unit；First absorption tube and second is inhaled
Closed tube is connect with two absorption tubes of parallel channels respectively, the gas not absorbed by the first absorption tube and the second absorption tube respectively into
Enter two absorption tubes of parallel channels.
46. on-line monitoring method as claimed in claim 45, which is characterized in that also further increased in the method 1 or
Multiple parallel channels, the absorption tube in multiple parallel channels are connect with the absorption tube of previous parallel channels.
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| CN107064420B (en) * | 2017-02-14 | 2023-11-28 | 中国科学院化学研究所 | Online monitoring system and method for medium-volatile organic compounds in atmosphere |
| CN107064029B (en) * | 2017-02-14 | 2023-10-17 | 中国科学院化学研究所 | Online nitrous acid and nitric acid concentration measurement system and measurement method |
| CN107860070A (en) * | 2017-12-22 | 2018-03-30 | 上海科华光电技术研究所 | Gas treatment equipment containing particulate matter |
| CN108229092B (en) * | 2018-01-09 | 2023-09-12 | 南京大学 | Atmospheric pollution simulation prediction algorithm for increasing liquid phase chemistry and wet sedimentation process |
| CN110146458B (en) * | 2019-06-11 | 2020-10-13 | 中国科学院化学研究所 | Online detection system and detection method for atmospheric soluble brown carbon |
| CN110146523B (en) * | 2019-06-17 | 2020-12-04 | 中国科学院化学研究所 | Atmospheric gaseous pollutant and particulate matter in-situ reaction device and detection method |
| CN113155561A (en) * | 2021-03-31 | 2021-07-23 | 杭州谱育科技发展有限公司 | Device and method for providing dinitrogen pentoxide standard gas |
| CN113970524B (en) * | 2021-10-25 | 2022-11-18 | 中国科学院化学研究所 | Method and system for measuring manganese content of atmospheric particulates on line |
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| CN101162200A (en) * | 2007-05-10 | 2008-04-16 | 沈阳东宇集团股份有限公司 | System using chemiluminescence method to execute nitrous oxides analysis |
| JP2012112783A (en) * | 2010-11-24 | 2012-06-14 | Miura Co Ltd | Method for quantitating nitrite ion |
| CN105556284B (en) * | 2014-05-27 | 2018-01-02 | 富士电机株式会社 | Gas analyzer |
| CN104330355A (en) * | 2014-11-19 | 2015-02-04 | 武汉怡特环保科技有限公司 | Dual-optical-path oxynitride analyzer |
| CN104458619A (en) * | 2014-12-12 | 2015-03-25 | 上海理工大学 | Method for determining content of oxynitride in air |
| CN105319171B (en) * | 2015-11-17 | 2018-12-25 | 山东省科学院海洋仪器仪表研究所 | The detection device and detection method of nitrite or nitrate content |
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