CN106802333A - A kind of NMHC on-line measuring device - Google Patents
A kind of NMHC on-line measuring device Download PDFInfo
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- CN106802333A CN106802333A CN201710048990.XA CN201710048990A CN106802333A CN 106802333 A CN106802333 A CN 106802333A CN 201710048990 A CN201710048990 A CN 201710048990A CN 106802333 A CN106802333 A CN 106802333A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/62—Detectors specially adapted therefor
- G01N30/64—Electrical detectors
- G01N30/68—Flame ionisation detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
- G01N30/14—Preparation by elimination of some components
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/24—Automatic injection systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/26—Conditioning of the fluid carrier; Flow patterns
- G01N30/38—Flow patterns
- G01N30/46—Flow patterns using more than one column
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Abstract
The present invention discloses a kind of NMHC on-line measuring device, including：Dust removal filter, drier, Zero gas generator, sampling channel one, switching valve, capillary blank pipe, methane molecule sieve, hydrogen flame ionization detector；The gas of sampling is by dust removal filter, remove dust, then by drier, remove the moisture in sample gas, again by Zero gas generator, the soda acid waste gas under test gas is removed, sampling channel one is passed through by pretreated gas, switching valve is passed through, arrive separately at capillary blank pipe by the transport of carrier gas sieves with methane molecule；Methane molecule sieve only allows methane to pass through, and under test gas are ionized into carbocation and electronics in hydrogen flame ionization detector, and micro-current is formed under electric field action, by amplification, forms output signal；Realize shortening testing time of NMHC so as to reach, while improve the accuracy of detection again, also have the advantages that to detect that multiple gases, simple structure, sensitivity are high, operating cost is low.
Description
Technical field
The present invention relates to NMHC detection technique field, more particularly to a kind of NMHC on-line measuring device.
Background technology
With rapid economic development, various environment are also to emerge in an endless stream, particularly various in recent years severe extreme weathers
Occur, cause and widely pay close attention to, such as the very fiery haze weather of recent research, " gas " this respect has been obtained for national sufficient
Enough attention, so volatile organic matter is a kind of important work in environmental monitoring now.
Volatile organic matter (VOCs) source has combustion of fossil fuel to be polluted with the one-level of vehicular emission than wide
Thing, also has plenty of the secondary pollution produced by photochemical reaction.Research shows, the time of VOCs and space in atmospheric environment
It is distributed closely related with the discharge characteristics of its pollution sources, meteorological condition and Atmospheric Chemistry response feature.Various pollution sources are respectively provided with
VOCs compositions change during the VOCs characteristic components of oneself uniqueness, source difference or source change will clearly result in air, change in addition
In learning reaction and Transport And Transformation effect (atmospheric photochemical reaction, dry deposition and wet deposition etc.) also large effect atmospheric environment
Organic pollution is constituted.There is most of VOCs compounds (such as alkene of low carbon number, alkane) Atmospheric Chemistry to react activity, be
Form the important as precursors thing of photochemical pollution.These pollutants enter human body by respiratory tract, alimentary canal and skin, its table
The toxicity that reveals, excitant, carcinogenesis and the special odor having can cause human body a variety of uncomfortable reactions occur, strong to human body
Kang Zaocheng large effects.Research show current so-called sick buildings thing syndrome (SBS), building associated diseases (BRI) and
Chemical substance allergy (MCS) is all relevant with this.Therefore volatile organic matter is increasingly becoming and characterizes the important of urban atmospheric pollution
Index, understands pollution situation, characteristic distributions and the rule of volatile organic matter in urban air, dissects the group of volatile organic matter
Into the effective way controlled with source, analysis volatile organic matter, immediate objective and long-range mesh to administering urban atmospheric pollution
Mark has positive effect.Existing technical disadvantages are time-consuming long, and the accuracy of detection is inadequate.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of NMHC on-line measuring device.
In order to solve the above technical problems, one aspect of the present invention is：There is provided a kind of NMHC online
Detection means, including：Dust removal filter, drier, Zero gas generator, sampling channel one, switching valve, capillary blank pipe, methane point
Son sieve, hydrogen flame ionization detector；The gas of sampling first has to, by the dust removal filter, remove dust, in order to avoid block pipe
Road, then by the drier, removes the moisture in sample gas, then by the Zero gas generator, in removing under test gas
Soda acid waste gas, the sampling channel one is passed through by pretreated gas, is passed through the switching valve, by the transport point of carrier gas
It is clipped to up to the capillary blank pipe and the methane molecule and sieves；Methane molecule sieve only allows methane to pass through, and under test gas are in the hydrogen
Carbocation and electronics are ionized into flame ionization detector, micro-current is formed under electric field action, by amplification, formed
Output signal.
Wherein, the NMHC on-line measuring device, including：
Two chromatographic columns, one is the methane molecule sieve, only allows methane to pass through, and the organic matter outside methane is all inhaled
It is attached on filler；The capillary blank pipe, when by the capillary blank pipe, all of gas can all pass through gas, but institute
Stating capillary blank pipe can play the effect of separation, and every kind of gas is different by the time of the capillary blank pipe, and institute is then led to again
State hydrogen flame ionization detector.
Wherein, methane molecule sieve, its fixing phase filler is 6% cyanogen propylbenzene and 94% dimethyl polysiloxane,
The methane molecule sieve only allows methane to pass through, and the organic gas outside methane can all be filtered, so the methane point
Son sieve can measure the concentration of methane.
Wherein, accurate measured value is obtained, every kind of gas for entering the hydrogen flame ionization detector all can not be to reality
Test result and play interference effect, hydrogen is produced by hydrogen generator；Hydrogen generator principle is exactly electrolysis water, Xiang Shuizhong
Addition NaOH, hydroxyl concentration can be very high in water, and hydrogen generator anode is that hydroxyl occurs oxidation reaction generation oxygen,
And negative electrode be then hydrogen ion occur reduction reaction obtain hydrogen, it is very environment friendly and pollution-free, pure hydrogen can be obtained, without organic
Thing impurity, and be green energy resource.
Wherein, under test gas can bring the hydrogen flame ionization detector into by carrier gas, so carrier gas must be by pre-
Treatment, without other organic gas, carrier gas meeting air compressor is sent to the Zero gas generator, the Zero gas generator meeting
Deacidification is carried out to air except a series for the treatment of of alkali, the gas after treatment is exactly pure nitrogen and oxygen free from foreign meter, will not be right
Test result has an impact.
Wherein, in order to ensure the temperature of gas, we continue to be heated with baking oven, and temperature is maintained at 180 degree or so, it is ensured that sample
Gas will not liquefy because temperature is too low, block pipeline or influence experimental result.
Wherein, the concentration of NMHC is detected, total carbon hydrocarbon to be measured is first had to, the concentration with methane, then with total
The concentration that carbon hydrocarbon subtracts methane can be obtained by the concentration of NMHC；The concentration of total hydrocarbon can with the gas of the capillary blank pipe
To measure, methane concentration can be measured with the gas sieved by methane molecule.
Wherein, the hydrogen flame ionization detector is a kind of high sensitivity common detector, to all of organic matter all
There is a response, and to the material that is not dissociated in inorganic matter, inert gas or flame without responding or response very little, its sensitivity specific heat
Lead detector high 100-10000 times, test limit reaches 10-13g/s, to temperature-insensitive, response is fast, being adapted to connection open tubular column is carried out
The separation of complex sample, the range of linearity is 10 7 powers, is to hydro carbons such as butane, hexane, sensitivity in gas chromatograph detector
A kind of best means, are widely used in the detection of volatile hydrocarbon and many carbon compounds.
Wherein, the NMHC on-line measuring device, selector with syringe drive circuit, in software control
Under, work in coordination, selection and the action of injection of sample are completed, realize Automatic Control；
The function of selector, including：Six sample air inlets of passage of connection, by the mechanical structure inside selector
And motor-drive circuit, the sample for wanting analysis channel can be accurately selected, sample is sent to syringe；
The function of syringe, including：Syringe is divided into Load states and Inject states, by injector motor electricity
Road is controlled, and syringe is toggled in Load states and Inject states；
Load states are sample more new state, are fresh sample gas in this state, in Loop pipes, and device to be injected enters
Inject states；
And Inject states are sample injections enter hydrogen flame ionization detector when state, this when, sample gas was by carrying
Gas brings the hydrogen flame ionization detector into.
The NMHC on-line measuring device that the present invention is provided, including：Dust removal filter, drier, Zero gas generator,
Sampling channel one, switching valve, capillary blank pipe, methane molecule sieve, hydrogen flame ionization detector；The gas of sampling is first had to by removing
Dirt filter, removes dust, in case blocking pipeline, then by drier, removes the moisture in sample gas, then occur through zero passage gas
Device, removes the soda acid waste gas under test gas, and sampling channel one is passed through by pretreated gas, is passed through switching valve, passes through
The transport of carrier gas arrives separately at capillary blank pipe and is sieved with methane molecule；Methane molecule sieve only allows methane to pass through, and under test gas are in hydrogen
Carbocation and electronics are ionized into flame ionization detector, micro-current is formed under electric field action, by amplification, formed
Output signal；So as to reach the testing time for realizing shortening NMHC, while improve the accuracy of detection again, also have
Have the advantages that to detect that multiple gases, simple structure, sensitivity are high, operating cost is low.
Brief description of the drawings
Fig. 1 is the structural representation of NMHC on-line measuring device of the present invention,.
Specific embodiment
The present invention provides a kind of NMHC on-line measuring device, is applied to NMHC detection technique field, this
Invention NMHC on-line measuring device, including：Dust removal filter, drier, Zero gas generator, sampling channel one, conversion
Valve, capillary blank pipe, methane molecule sieve, hydrogen flame ionization detector；The gas of sampling first has to, by dust removal filter, remove powder
Dirt, in case blocking pipeline, then by drier, removes the moisture in sample gas, then by Zero gas generator, remove under test gas
In soda acid waste gas, be passed through sampling channel one by pretreated gas, be passed through switching valve, arrived respectively by the transport of carrier gas
Sieved up to capillary blank pipe and methane molecule；Methane molecule sieve only allows methane to pass through, and under test gas are in hydrogen flame ionization detector
Carbocation and electronics are ionized into, micro-current is formed under electric field action, by amplification, form output signal；So as to reach
To realizing shortening testing time of NMHC, while improve the accuracy of detection again, also with various gas can be detected
Body, simple structure, the advantage that sensitivity is high, operating cost is low.
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention provides a kind of NMHC on-line measuring device.
Fig. 1 is referred to, Fig. 1 is the structural representation of NMHC on-line measuring device of the present invention, non-methane of the present invention
Total hydrocarbon on-line measuring device, including：
Dust removal filter 1, drier 2, Zero gas generator 3, sampling channel 1, switching valve 5, capillary blank pipe 6, methane point
Son sieve 7, hydrogen flame ionization detector 8；
The gas of sampling first has to, by dust removal filter 1, remove dust, in order to avoid blocking pipeline, then by drier
2, the moisture in sample gas is removed, then by Zero gas generator 3, the soda acid waste gas under test gas is removed, by pretreated
Gas is passed through sampling channel 1, is passed through switching valve 5, and arrive separately at capillary blank pipe 6 by the transport of carrier gas sieves 7 with methane molecule；
Methane molecule sieve only allows methane to pass through, and under test gas are ionized into carbocation and electronics in hydrogen flame ionization detector 8,
Micro-current is formed under electric field action, by amplification, output signal is formed.
Wherein, the NMHC on-line measuring device, including：
Two chromatographic columns, one is methane molecule sieve 7, only allows methane to pass through, and the organic matter outside methane is all adsorbed
On filler；Capillary blank pipe 6, when by capillary blank pipe 6, all of gas can all pass through gas, but the energy of capillary blank pipe 6
The effect of separation is enough played, every kind of gas is different by the time of capillary blank pipe 6, and hydrogen flame ionization detector 8 is then led to again.
Wherein, methane molecule sieve 7, its fixing phase filler is 6% cyanogen propylbenzene and 94% dimethyl polysiloxane, methane
7, molecular sieve allows methane to pass through, and the organic gas outside methane can all be filtered, so methane molecule sieve 7 can be surveyed
Go out the concentration of methane.
Wherein, accurate measured value is obtained, the gas of every kind of entrance hydrogen flame ionization detector 8 can not all be tied to experiment
Fruit plays interference effect, and hydrogen is produced by hydrogen generator；Hydrogen generator principle is exactly electrolysis water, is added in water
NaOH, hydroxyl concentration can be very high in water, and hydrogen generator anode is that hydroxyl occurs oxidation reaction generation oxygen, and cloudy
Pole is then that hydrogen ion generation reduction reaction obtains hydrogen, very environment friendly and pollution-free, pure hydrogen can be obtained, without organic matter etc.
Impurity, and be green energy resource.
Wherein, under test gas can bring hydrogen flame ionization detector 8 into by carrier gas, so carrier gas must be by pre- place
Reason, without other organic gas, carrier gas meeting air compressor is sent to Zero gas generator 3, and Zero gas generator 3 can enter to air
Except a series for the treatment of such as alkali, the gas after treatment is exactly pure nitrogen and oxygen free from foreign meter for row deacidification, and test will not be tied
Fruit has an impact.
Wherein, in order to ensure the temperature of gas, we continue to be heated with baking oven, and temperature is maintained at 180 degree or so, it is ensured that sample
Gas will not liquefy because temperature is too low, block pipeline or influence experimental result.
Wherein, the concentration of NMHC is detected, total carbon hydrocarbon to be measured is first had to, the concentration with methane, then with total
The concentration that carbon hydrocarbon subtracts methane can be obtained by the concentration of NMHC；The gas of the concentration capillary blank pipe 6 of total hydrocarbon can be with
Measure, methane concentration can be measured with the gas sieved by methane molecule.
Wherein, hydrogen flame ionization detector 8 is a kind of high sensitivity common detector, has sound to all of organic matter
Should, and to material for not dissociated in inorganic matter, inert gas or flame etc. without responding or response very little, its remolding sensitivity thermal conductivity
Detector is high 100-10000 times, and test limit reaches 10-13g/s, and to temperature-insensitive, response is fast, is adapted to connection open tubular column and is answered
The separation of miscellaneous sample, the range of linearity is 10 7 powers, is the hexane to hydro carbons such as butane in gas chromatograph detector, and sensitivity is most
A kind of good means, are widely used in the detection of volatile hydrocarbon and many carbon compounds.
Wherein, the NMHC on-line measuring device, selector with syringe drive circuit, under software,
Work in coordination, complete selection and the action of injection of sample, realize Automatic Control；
The function of selector, including：Six sample air inlets of passage of connection, by the mechanical structure inside selector
And motor-drive circuit, the sample for wanting analysis channel can be accurately selected, sample is sent to syringe；
The function of syringe, including：Syringe is divided into Load states and Inject states, by injector motor electricity
Road is controlled, and syringe is toggled in Load states and Inject states；
Load states are sample more new state, are fresh sample gas in this state, in Loop pipes, wait syringe to enter
Enter Inject states；
And Inject states are sample injections enter hydrogen flame ionization detector when state, this when, sample gas was by carrying
Gas brings hydrogen flame ionization detector 8 into.
Two kinds of chromatographic columns used by NMHC on-line measuring device of the present invention are all high temperature resistants, corrosion-resistant.
NMHC on-line measuring device of the present invention, including inwall polishing baking oven, wherein baking oven set air inlet with
Gas outlet, carrier gas A, carrier gas B and under test gas are all to enter syringe by air inlet, and carrier gas passes through with test gas
Gas port enters flame ionization detector.Oven side wall hangs two chromatographic columns, and chromatographic column plays chromatography effect.Aggregate sample gas leads to
Cross pretreatment unit and carry out dedusting, dehumidifying, except Acid-base Gas and constant-current voltage-stabilizing treatment after, enter into the how logical quantitative of gas-chromatography
Switching valve, subsequent Fen Ji roads are separated into chromatographic column.Sample component after separation is by hydrogen flame ionization detector by hydrogen
Flame combustion, makes sample pneumoelectric from ion and the electronics displacement in the presence of polarizing voltage form Weak current, and this is micro-
Low current is sent to amplifier and is amplified by holding wire, obtains chromatographic data, compares by the chromatographic data with standard substance,
The concentration of various composition in sample gas can be drawn, the concentration total hydrocarbon concentration of wherein NMHC subtracts methane concentration；
The present invention has the advantages that to detect that multiple gases, simple structure, sensitivity are high, operating cost is low.
Under test gas, hydrogen flame ionization detector is transported to by carrier gas by NMHC on-line measuring device of the present invention,
Organic gas is ionized into carbocation and electronics in hydrogen flame, ion stream is formed under electric field action, and form micro- with electrode
Electric current, amplified output forms output signal, and hydrogen flame ionization detector has high sensitivity and the larger range of linearity,
Hydrogen flame ionization detector is insensitive for non-combustible gas, such as H2O, CO2, SO2 etc., and shortcoming is exactly that hydrogen flame ionization is examined
Survey device has destructiveness for sample.It is transferred to and current signal is converted on computer, it is right that the integral area according to oscillogram is calculated
The concentration value of the volatile organic matter answered.The whole testing time also just within 200 seconds, the concentration calculation of NMHC
The concentration of methane is exactly subtracted with the concentration of total carbon hydrocarbon.
The NMHC on-line measuring device that the present invention is provided, the problem for mainly solving shortens NMHC
Testing time, a complete testing time is only 90s, and secondary device has two chromatographic columns, and one is molten silicon capillary blank pipe, this
Chromatographic column does not play centrifugation, gas by time of this chromatographic column also quickly, it is only necessary to 15s or so can just go out waveform
Figure, then another chromatographic column is methane molecule sieve, and the role of it is the effect for filtering other gases, and only methane leads to
Cross, time 50s that methane passes through chromatographic column or so, so the testing time of package unit can complete in 90s.
The NMHC on-line measuring device that the present invention is provided, is changed on the basis of hydrogen flame ionization detector
Make, measured by the way of two-tube parallel connection, facilitate air inlet, also substantially reduce the testing time.Under test gas are through over-sampling
After the pretreatment of disk, by introduction valve, respectively by two chromatographic columns of parallel connection under the leading of carrier gas, the electricity in hydrogen flame
From, CHO+ and electronics are formed, displacement is done in the presence of power plant, micro-current is formed, exported by amplifying, form output letter
Number.
The NMHC on-line measuring device that the present invention is provided, including：Dust removal filter 1, drier 2, zero gas occur
Device 3, sampling channel 1, switching valve 5, capillary blank pipe 6, methane molecule sieve 7, hydrogen flame ionization detector 8；The gas of sampling is first
First dust is removed by dust removal filter 1, in case blocking pipeline, then by drier 2, removes the moisture in sample gas, then
By Zero gas generator 3, the soda acid waste gas under test gas is removed, sampling channel 1 is passed through by pretreated gas, led to
Enter switching valve 5, arrive separately at capillary blank pipe 6 by the transport of carrier gas sieves 7 with methane molecule；Methane molecule sieve only allows methane to lead to
Cross, under test gas are ionized into carbocation and electronics in hydrogen flame ionization detector 8, micro-current formed under electric field action,
By amplification, output signal is formed；So as to reach the testing time for realizing shortening NMHC, while improve again
The accuracy of detection, also has the advantages that to detect that multiple gases, simple structure, sensitivity are high, operating cost is low.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and between not necessarily requiring or implying these entities or operate
There is any this actual relation or order.And, term "comprising", " including " or its any other variant be intended to contain
Lid nonexcludability is included, so that process, method, article or equipment including a factor of system not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, by sentence " including one,,, " key element that limits, it is not excluded that
Also there is other identical element in the process including the key element, method, article, equipment or device.
For NMHC on-line measuring device of the present invention, the form of realization is diversified.It is all of the invention
Within spirit and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (9)
1. a kind of NMHC on-line measuring device, it is characterised in that including：
Dust removal filter, drier, Zero gas generator, sampling channel one, switching valve, capillary blank pipe, methane molecule sieve, hydrogen flame from
Sonization detector；
The gas of sampling first has to, by the dust removal filter, remove dust, in order to avoid blocking pipeline, then by the drying
Device, removes the moisture in sample gas, then by the Zero gas generator, removes the soda acid waste gas under test gas, by pretreatment
Gas afterwards is passed through the sampling channel one, is passed through the switching valve, and the capillary blank pipe is arrived separately at by the transport of carrier gas
Sieved with the methane molecule；Methane molecule sieve only allows methane to pass through, under test gas electricity in the hydrogen flame ionization detector
From into carbocation and electronics, micro-current is formed under electric field action, by amplification, form output signal.
2. NMHC on-line measuring device as claimed in claim 1, it is characterised in that the NMHC is examined online
Device is surveyed, including：
Two chromatographic columns, one is the methane molecule sieve, only allows methane to pass through, and the organic matter outside methane is all attracted to
On filler；The capillary blank pipe, when by the capillary blank pipe, all of gas can all pass through gas, but the hair
Thin blank pipe can play the effect of separation, and every kind of gas is different by the time of the capillary blank pipe, and the hydrogen is then led to again
Flame ionization detector.
3. NMHC on-line measuring device as claimed in claim 1, it is characterised in that the methane molecule sieve, it is consolidated
Phase filler is determined for 6% cyanogen propylbenzene and 94% dimethyl polysiloxane, and the methane molecule sieve only allows methane to pass through, methane
Outer organic gas can all be filtered, so methane molecule sieve can measure the concentration of methane.
4. NMHC on-line measuring device as claimed in claim 1, it is characterised in that to obtain accurate measured value,
Every kind of gas for entering the hydrogen flame ionization detector can not all play interference effect to experimental result, and hydrogen is by hydrogen
What generator was produced；Hydrogen generator principle is exactly electrolysis water, and to NaOH is added in water, hydroxyl concentration can be very in water
Height, hydrogen generator anode be hydroxyl occur oxidation reaction generation oxygen, and negative electrode be then hydrogen ion occur reduction reaction obtain
It is very environment friendly and pollution-free to hydrogen, pure hydrogen can be obtained, without organic impurities, and be green energy resource.
5. NMHC on-line measuring device as claimed in claim 1, it is characterised in that under test gas can be by carrier gas band
Enter the hydrogen flame ionization detector, so carrier gas must be by pretreatment, without other organic gas, carrier gas can use sky
Air compressor is sent to the Zero gas generator, and the Zero gas generator can carry out deacidification except a series for the treatment of of alkali, treatment to air
Gas afterwards is exactly pure nitrogen and oxygen free from foreign meter, will not be had an impact to test result.
6. NMHC on-line measuring device as claimed in claim 1, it is characterised in that in order to ensure the temperature of gas,
We continue to be heated with baking oven, and temperature is maintained at 180 degree or so, it is ensured that sample gas will not liquefy because temperature is too low, block pipe
Road or influence experimental result.
7. NMHC on-line measuring device as claimed in claim 1, it is characterised in that detect the dense of NMHC
Degree, first has to total carbon hydrocarbon to be measured, and the concentration with methane, the concentration for then subtracting methane with total carbon hydrocarbon can be obtained by non-methane
The concentration of total hydrocarbon；The concentration of total hydrocarbon can be measured with the gas of the capillary blank pipe, and methane concentration can be with by methane molecule
The gas of sieve is measured.
8. NMHC on-line measuring device as claimed in claim 1, it is characterised in that the hydrogen flame ionization detector
It is a kind of high sensitivity common detector, has response to all of organic matter, and in inorganic matter, inert gas or flame
, without responding or responding very little, its remolding sensitivity thermal conductivity detector (TCD) is high 100-10000 times, and test limit reaches 10- for the material not dissociated
13g/s, to temperature-insensitive, response is fast, and being adapted to connection open tubular column carries out the separation of complex sample, and the range of linearity is 7 times of 10
Side, is to be widely used in fluid carbon to hydro carbons such as butane, a kind of hexane, the best means of sensitivity in gas chromatograph detector
The detection of hydrogen compound and many carbon compounds.
9. NMHC on-line measuring device as claimed in claim 1, it is characterised in that
The NMHC on-line measuring device, selector under software, mutually matches with the drive circuit of syringe
Close, complete selection and the action of injection of sample, realize Automatic Control；
The function of selector, including：Six sample air inlets of passage of connection, by mechanical structure and electricity inside selector
Drive circuit, can accurately select the sample for wanting analysis channel, and sample is sent into syringe；
The function of syringe, including：Syringe is divided into Load states and Inject states, by injector motor circuit control
System, syringe is toggled in Load states and Inject states；
Load states are sample more new state, are fresh sample gas in this state, in Loop pipes, and device to be injected enters
Inject states；
And Inject states are sample injections enter hydrogen flame ionization detector when state, this when, sample gas was by carrier gas band
Enter the hydrogen flame ionization detector.
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| CN201710048990.XA CN106802333A (en) | 2017-01-23 | 2017-01-23 | A kind of NMHC on-line measuring device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107247109A (en) * | 2017-08-09 | 2017-10-13 | 苏州赛普睿特仪器有限公司 | Chromatographic system and method |
| CN108982728A (en) * | 2018-05-30 | 2018-12-11 | 上海市环境监测中心 | A kind of optimization of surrounding air non-methane total hydrocarbons online monitoring instruments and calibration method |
| CN109270183A (en) * | 2018-12-03 | 2019-01-25 | 华电智控（北京）技术有限公司 | Gas-chromatography non-methane total hydrocarbons detection device |
| CN109752344A (en) * | 2017-11-08 | 2019-05-14 | 中国石油化工股份有限公司 | A kind of portable non-methane total hydrocarbons concentration detector and detection method |
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