CN104535380A - Additive-process gas sampling dynamic gas distribution calibration system and method - Google Patents
Additive-process gas sampling dynamic gas distribution calibration system and method Download PDFInfo
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Abstract
The invention provides an additive-process gas sampling dynamic gas distribution calibration system and method. The additive-process gas sampling dynamic gas distribution calibration system comprises a gas sample sampling pump, a first flow controller, a second flow controller, a filter, a constant temperature tank and an analysis detection instrument; the first flow controller and the second flow controller are connected with the gas sample sampling pump; a diffusion pool or a permeation pool is arranged in the constant temperature tank; the first flow controller, the filter, the diffusion pool or the permeation pool and the analysis detection instrument are connected in sequence; the second flow controller, a tank body of the constant temperature tank and the analysis detection instrument are connected in sequence. The additive-process gas sampling dynamic gas distribution calibration system and method are used for on-line detection and analysis, the uncertainty of measurement is reduced, and the detection efficiency, the accuracy and the traceability are improved.
Description
Technical field
The present invention relates to gas sampling and dynamic air-distributing field, particularly relate to a kind of additive process gas sampling dynamic air-distributing calibration system and method.
Background technology
Gas sampling technologies and calibrating gas dynamic air-distributing technology have a wide range of applications in fields such as environmental air quality monitoring, climate change observation, calibrating gas developments.
Anemostat (or osmos tube) calibrating gas dynamic air-distributing method in use has following characteristics:
1) can by sample gas as planting the preparation of being with carrier gas to carry out complicated substrate calibrating gas;
2) preparation of corrosivity, adsorbability, reactive calibrating gas can be prepared;
3) can use continuously for 24 hours;
4) once dilution just can prepare 10
-9the calibrating gas of mol/mol magnitude;
5) there is extraordinary long-time stability and repdocutbility;
6) automatic calibration of on-line analysis detecting instrument is particularly suitable for.
Additive process analytical technology in use has following characteristics:
1) the inconsistent mushing error brought of background component amount of minimizing standard and sample;
2) analysis trace background gas component amount can be added by linear series;
3) under same sampling condition, uncertainty of measurement can be reduced.
The measurement of usual gas sample constituents amount collects in container containing by Constant flow sample pump by sample gas, and container containing can be airbag, Flux bottle, adsorption tube etc., temperature during record sampling simultaneously, pressure and time.The concentration of tested gas sample constituents amount can be as follows by the Ideal-Gas Equation calculation expression:
C
sample＝f(P,T,F)*m
i(1)
Here:
C
samplefor gaseous sample needs the concentration of component of measurement, μm ol/mol;
P is environmental pressure during sampling, atm;
T is environment temperature during sampling; K;
F is sampling flow, L/min;
M
ifor tested group component quality, μ g/min.
After having sampled, then sample is passed into analytical instrument analysis; Undertaken quantitatively by calibrating gas.Can be expressed by following formula:
Here:
A
ifor the signal response of tested component i in instrumental analysis;
A
stfor the signal response of calibrating gas in instrumental analysis;
C
stfor standard gas concentration value, μm ol/mol.
If calibrating gas is produced by anemostat (or osmos tube) dynamic air-distributing, be calculated as follows by Fick ' s law dynamic air-distributing standard gas concentration value:
C
st＝f(P,T,F,)*(R
i+m
i) (3)
Here:
C
stfor standard gas concentration value, μm ol/mol;
Environmental pressure when P is dynamic air-distributing, atm;
Environment temperature when T is dynamic air-distributing; K;
F is that dynamic air-distributing plants band airshed, L/min;
R
ifor tested diffusion of components pipe diffusivity (or osmos tube permeability), μ g/min;
M
ifor tested group component quality, μ g/min.
At present, the detection of ambient gas composition amount is mainly by sampling analysis (comprising online and off-line), and instrument calibration and sampling separate, and calibrates its background component amount of calibrating gas used and actual sample background component amount differs greatly.Detect uncertainty source to mainly contain: sample temperature, pressure, flow, calibrating gas, background interference, instrument detectability etc.
The research method of sampling and on-line calibration technology are atmospheric environment field, various countries scientist difficult problems urgently to be resolved hurrily.Therefore, be necessary that research one can produce high-quality on-line calibration gas and make sampling and calibrate closely related by continous-stable, reduce the technology in various quantitative detection uncertainty source.
Summary of the invention
In view of this, the present invention is intended to propose a kind of the additive process gas sampling dynamic air-distributing calibration system and the method that improve accuracy in detection and calibration efficiency.
First aspect, the invention provides a kind of additive process gas sampling dynamic air-distributing calibration system, comprising: gaseous sample sampling pump, first flow controller, second amount controller, filtrator, calibration cell and analysis and detecting instrument; Described first flow controller is all connected with described gaseous sample sampling pump with described second amount controller; Diffusion cell or osmotic cell is provided with in described calibration cell; Described first flow controller, described filtrator, described diffusion cell or osmotic cell and described analysis and detecting instrument are linked in sequence; Cell body and the described analysis and detecting instrument of described second amount controller, described calibration cell are linked in sequence.
Further, in above-mentioned additive process gas sampling dynamic air-distributing calibration system, described gaseous sample sampling pump is connected with described first flow controller, described second amount controller respectively by T-valve.
Further, in above-mentioned additive process gas sampling dynamic air-distributing calibration system, described gaseous sample sampling pump is connected with described first flow controller, described second amount controller with tetrafluoro gas circuit respectively by T-valve; Between described first flow controller, described filtrator, described diffusion cell or osmotic cell and described analysis and detecting instrument by tetrafluoro gas circuit be linked in sequence described second amount controller, described calibration cell cell body be connected by tetrafluoro gas circuit with described analysis and detecting instrument.
Further, in above-mentioned additive process gas sampling dynamic air-distributing calibration system, pressure maintaining valve, thermometer and tensimeter is also comprised; Described pressure maintaining valve, described thermometer and described tensimeter are arranged in tetrafluoro gas circuit.
Further, in above-mentioned additive process gas sampling dynamic air-distributing calibration system, also centralized control unit is comprised; Described centralized control unit is connected with described pressure maintaining valve, described thermometer, described tensimeter, described first flow controller, described second amount controller and described analysis and detecting instrument signal.
Further, in above-mentioned additive process gas sampling dynamic air-distributing calibration system, the touch control that described centralized control unit is also provided with as man-machine interface shields.
Further, in above-mentioned additive process gas sampling dynamic air-distributing calibration system, described gas samping pump is air sampler.
Further, in above-mentioned additive process gas sampling dynamic air-distributing calibration system, described first flow controller and described second amount controller are spinner-type flowmeter.
On the other hand, present invention also offers a kind of additive process gas sampling dynamic air-distributing calibration steps, the method, based on above-mentioned additive process gas sampling dynamic air-distributing calibration system, comprises the steps:
The sample gas controlling to flow out in described first flow controller carries out filtration drying at described filtrator; When the sample gas after filtration drying is through described calibration cell, by described diffusion cell or osmotic cell diffusion or the component carrier band that penetrates and when diluting, the sample gas controlled in described second amount controller directly enters described calibration cell; Wherein, through described diffusion cell or osmotic cell diffusion or infiltration be standard model gas, this standard model gas has carried out the operation that dynamic air-distributing adds tested component; The standard model gas controlling to add through dynamic air-distributing tested component enters described analysis and detecting instrument with the sample gas directly flowed out through described calibration cell with identical temperature, pressure and flow; Control the flow analysis of described analysis and detecting instrument wheel and add the standard model gas of tested component and the direct sample gas flowed out through described calibration cell through dynamic air-distributing, meet with a response signal.
Further, in above-mentioned additive process gas sampling dynamic air-distributing calibration steps, filtration drying is treated to, and described filtrator carries out the process of purifying dust and moisture to the sample gas flowed out by described first flow controller.
The present invention utilizes gaseous sample sampling pump sample gas to be divided into two: a road is that this standard model gas a adds tested component through dynamic air-distributing successively through the standard model gas a adding tested component through dynamic air-distributing of filtrator, the diffusion cell (or osmotic cell) be arranged in calibration cell; Another road is directly through the sample gas b of the cell body of calibration cell.Design makes sample gas b temperature, pressure keep the same with flow with standard model gas a.Calibration component is added by on-line checkingi flow direction design dynamic air-distributing after collected specimens gas, utilize and develop simultaneously with tense sampling and calibration, tested gas componant amount only responds relevant with diffusion cell diffusivity (or osmotic cell permeability) with analysis and detecting instrument, and then realize on-line checkingi calibration, eliminate the uncertain source that temperature, pressure and flow in sampling and analyzing testing process bring, substantially increase quantitative accuracy in detection, improve testing calibration efficiency, reduce analysis cost, ensure that the tractability of testing result.
Accompanying drawing explanation
By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred implementation, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
Fig. 1 is the structured flowchart according to additive process gas sampling dynamic air-distributing calibration system preferred embodiment of the present invention.
Embodiment
Below with reference to accompanying drawings exemplary embodiment of the present disclosure is described in more detail.Although show exemplary embodiment of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the embodiment set forth here.On the contrary, provide these embodiments to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
Below in conjunction with Fig. 1, the preferred embodiment of additive process gas sampling dynamic air-distributing calibration system of the present invention is described.
The present embodiment additive process gas sampling dynamic air-distributing calibration system comprises: gaseous sample sampling pump 10, first flow controller 20A, second amount controller 20B, filtrator 30, calibration cell 40 and analysis and detecting instrument 60; First flow controller 20A is all connected with gaseous sample sampling pump 10 with second amount controller 20B.Diffusion cell or osmotic cell 50 is provided with in calibration cell 40.First flow controller 20A, filtrator 30, diffusion cell or osmotic cell 50 and analysis and detecting instrument 60 are linked in sequence; Cell body and the analysis and detecting instrument 60 of second amount controller 20B, calibration cell 40 are linked in sequence.
Specifically, in the present embodiment, gaseous sample sampling pump 10 is connected with first flow controller 20A, second amount controller 20B with tetrafluoro gas circuit respectively by T-valve; Be linked in sequence by tetrafluoro gas circuit between first flow controller 20A, filtrator 30, diffusion cell or osmotic cell 50 and analysis and detecting instrument 60; The cell body of second amount controller 20B, calibration cell 40 is connected by tetrafluoro gas circuit with analysis and detecting instrument 60.
The present embodiment also comprises the pressure maintaining valve be arranged in tetrafluoro gas circuit, thermometer, tensimeter and centralized control unit (not illustrating in FIG).Centralized control unit is connected with pressure maintaining valve, thermometer, tensimeter, first flow controller 20A, second amount controller 20B and analysis and detecting instrument 60 signal.In order to easy to operate, the touch control that centralized control unit is also provided with as man-machine interface shields.The on-the-spot temperature to whole system of touch control screen of centralized control unit, pressure, flow are implemented to control and monitoring.
In the present embodiment, gas samping pump 10 can be known air sampler; First flow controller 20A and second amount controller 20B can be spinner-type flowmeter; Filtrator 30 is abbreviations of purifying exsiccator; Calibration cell 40 (not shown concrete structure design), its diffusion cell built with tested component (or osmotic cell), after one road gas passes through filtrator 30, again via the diffusion cell (or osmotic cell) that gas circuit design is inserted in calibration cell 40; Another road gas directly enters calibration cell 40; Preferably, this two-way gas can also enter gas sampling system (not shown), and it requires to make two-way gas according to analysis and detecting instrument 60 sample introduction; Analysis and detecting instrument 60 directly enters the sample gas of calibration cell for taking turns flow analysis and adds gas through the dynamic air-distributing calibration of diffusion cell (or osmotic cell), and meet with a response signal (not shown).Diffusion cell or osmotic cell 50 can adopt ISO6145 anemostat (or osmos tube).
The calibration steps of additive process gas sampling dynamic air-distributing calibration system is:
S1, the sample gas controlling to flow out in first flow controller 20A carries out filtration drying at filtrator 30;
S2, when the sample gas after filtration drying is through calibration cell 40, diffusion cell or osmotic cell 50 are spread or the component carrier band that penetrates and dilute time, the sample gas controlled in second amount controller 20B directly enters calibration cell 40; Wherein, the sample gas spreading through diffusion cell or osmotic cell 50 or permeate is standard model gas a, and this standard model gas a has carried out the operation that dynamic air-distributing adds tested component;
S3, the standard model gas a controlling to add through dynamic air-distributing tested component enters analysis and detecting instrument 60 with the sample gas b directly flowed out through calibration cell 40 with identical temperature, pressure and flow;
S4, control analysis detecting instrument 60 is taken turns flow analysis and is added the sample gas of tested component and the direct sample gas gone out through constant temperature concentrated flow 40 through dynamic air-distributing, and meet with a response signal.
Filtrator 30 just removes dust in sample gas and moisture.
The specific works principle of the present embodiment is as follows:
1, directly through the concentration of the sample gas b component amount to be measured of calibration cell 40 outflow
Can be as follows by the Ideal-Gas Equation calculation expression:
C
sample＝f(P,T,F)*m
i(4)
C
samplefor gaseous sample needs the concentration of component of measurement, μm ol/mol;
P is environmental pressure during sampling, atm;
T is environment temperature during sampling; K;
F is sampling flow, L/min;
M
ifor tested group component quality, μ g/min.
2, the concentration of the standard model gas a component amount to be measured of tested component is added through dynamic air-distributing
If calibrating gas is produced by anemostat (or osmos tube) dynamic air-distributing, be calculated as follows by Fick ' s law dynamic air-distributing standard gas concentration value:
C
st＝f(P,T,F,)*(R
i+m
i) (5)
Here:
C
stfor standard model gas a concentration value, μm ol/mol;
Environmental pressure when P is dynamic air-distributing, atm;
Environment temperature when T is dynamic air-distributing; K;
F is that dynamic air-distributing plants band airshed, L/min;
R
ifor tested diffusion of components pipe diffusivity (or osmos tube permeability), μ g/min;
M
ifor tested group component quality, μ g/min.
3, after being analyzed by analysis and detecting instrument
Sample gas b associates as follows with standard model gas a by response signal:
Here:
A
ifor the signal response of the tested component i of sample gas b in analysis and detecting instrument;
A
sfor the signal response of standard model gas a component i in analysis and detecting instrument;
C
stfor standard model gas a component i concentration value, μm ol/mol.
4, (4), (5), the association of (6) formula are calculated:
Can find out, tested gas componant amount is only relevant with anemostat diffusivity (or osmos tube permeability) with instrument response.
The present embodiment relates to a kind of technology utilizing mixed gas dynamic air-distributing technology, add the next online accurately measurement environment gas sample constituents amount of analytical approach, gas sampling control technology and gas circuit designing technique.On-line checkingi and analysis is mainly used according to the additive process gas sampling dynamic air-distributing calibration system that the present embodiment adopts, tested gas componant amount is only relevant with anemostat diffusivity (or osmos tube permeability) with instrument response, greatly reduce and detect uncertainty source, improve quantitative accuracy in detection, improve testing calibration efficiency, reduce analysis cost, ensure that the tractability of testing result.
On the other hand, present invention also offers a kind of additive process gas sampling dynamic air-distributing calibration steps, the method is based on above-mentioned additive process gas sampling dynamic air-distributing calibration system, and this comprises the steps:
S1, the sample gas controlling to flow out in first flow controller 20A carries out filtration drying at filtrator 30;
S2, when the sample gas after filtration drying is through calibration cell 40, diffusion cell or osmotic cell 50 are spread or the component carrier band that penetrates and dilute time, the sample gas controlled in second amount controller 20B directly enters calibration cell 40; Wherein, the sample gas spreading through diffusion cell or osmotic cell 50 or permeate has carried out the operation that dynamic air-distributing adds tested component;
S3, the standard model gas a controlling to add through dynamic air-distributing tested component enters analysis and detecting instrument 60 with the sample gas b directly flowed out through calibration cell 40 with identical temperature, pressure and flow;
S4, control analysis detecting instrument 60 is taken turns flow analysis and is added the sample gas of tested component and the direct sample gas gone out through constant temperature concentrated flow 40 through dynamic air-distributing, and meet with a response signal.
Preferably, filtration drying is wherein treated to, and filtrator carries out the process of purifying dust and moisture to the sample gas flowed out by described first flow controller.
Due to when additive process gas sampling dynamic air-distributing calibration system is described, be described the principle of additive process gas sampling dynamic air-distributing collimation technique, relevant part illustrates with reference to aforementioned, and the present invention repeats no more this.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. an additive process gas sampling dynamic air-distributing calibration system, is characterized in that, comprising:
Gaseous sample sampling pump, first flow controller, second amount controller, filtrator, calibration cell and analysis and detecting instrument;
Described first flow controller is all connected with described gaseous sample sampling pump with described second amount controller;
Diffusion cell or osmotic cell is provided with in described calibration cell;
Described first flow controller, described filtrator, described diffusion cell or osmotic cell and described analysis and detecting instrument are linked in sequence;
Cell body and the described analysis and detecting instrument of described second amount controller, described calibration cell are linked in sequence.
2. additive process gas sampling dynamic air-distributing calibration system according to claim 1, is characterized in that,
Described gaseous sample sampling pump is connected with described first flow controller, described second amount controller respectively by T-valve.
3. additive process gas sampling dynamic air-distributing calibration system according to claim 2, is characterized in that,
Described gaseous sample sampling pump is connected with described first flow controller, described second amount controller with tetrafluoro gas circuit respectively by T-valve;
Be linked in sequence by tetrafluoro gas circuit between described first flow controller, described filtrator, described diffusion cell or osmotic cell and described analysis and detecting instrument
The cell body of described second amount controller, described calibration cell is connected by tetrafluoro gas circuit with described analysis and detecting instrument.
4. additive process gas sampling dynamic air-distributing calibration system according to claim 3, is characterized in that,
Also comprise pressure maintaining valve, thermometer and tensimeter;
Described pressure maintaining valve, described thermometer and described tensimeter are arranged in tetrafluoro gas circuit.
5. additive process gas sampling dynamic air-distributing calibration system according to claim 4, is characterized in that, also comprise:
Centralized control unit;
Described centralized control unit is connected with described pressure maintaining valve, described thermometer, described tensimeter, described first flow controller, described second amount controller and described analysis and detecting instrument signal.
6. additive process gas sampling dynamic air-distributing calibration system according to claim 5, is characterized in that,
The touch control that described centralized control unit is also provided with as man-machine interface shields.
7. additive process gas sampling dynamic air-distributing calibration system according to claim 6, is characterized in that,
Described gas samping pump is air sampler.
8. additive process gas sampling dynamic air-distributing calibration system according to claim 7, is characterized in that,
Described first flow controller and described second amount controller are spinner-type flowmeter.
9. an additive process gas sampling dynamic air-distributing calibration steps, is characterized in that, the method, based on the additive process gas sampling dynamic air-distributing calibration system such as according to any one of claim 1 to 8, comprises the steps:
The sample gas controlling to flow out in described first flow controller carries out filtration drying at described filtrator;
When the sample gas after filtration drying is through described calibration cell, by described diffusion cell or osmotic cell diffusion or the component carrier band that penetrates and when diluting, the sample gas controlled in described second amount controller directly enters described calibration cell; Wherein, through described diffusion cell or osmotic cell diffusion or infiltration be standard model gas, this standard model gas has carried out the operation that dynamic air-distributing adds tested component;
The standard model gas controlling to add through dynamic air-distributing tested component enters described analysis and detecting instrument with the sample gas directly flowed out through described calibration cell with identical temperature, pressure and flow;
Control the flow analysis of described analysis and detecting instrument wheel and add the standard model gas of tested component and the direct sample gas flowed out through described calibration cell through dynamic air-distributing, meet with a response signal.
10. additive process gas sampling dynamic air-distributing calibration steps according to claim 9, is characterized in that,
Filtration drying is treated to, and described filtrator carries out the process of purifying dust and moisture to the sample gas flowed out by described first flow controller.
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