CN106596205B - Surrounding air acquisition and calibration and medical gas preparation method - Google Patents
Surrounding air acquisition and calibration and medical gas preparation method Download PDFInfo
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- CN106596205B CN106596205B CN201510674640.5A CN201510674640A CN106596205B CN 106596205 B CN106596205 B CN 106596205B CN 201510674640 A CN201510674640 A CN 201510674640A CN 106596205 B CN106596205 B CN 106596205B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2273—Atmospheric sampling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
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Abstract
The present invention relates to a kind of methods for acquiring surrounding air, comprising the following steps: a. selects air acquisition place, and the air acquisition place is located on atmospheric boundary layer；B. air trapping tank is provided, the air trapping tank includes tank body, valve and pressure gauge；C. cryogen feeding mechanism is provided, the cryogen feeding mechanism provides cryogen with the cooling air trapping tank；And d. provides airtight pump, is connected to the air trapping tank by the first air delivery pipe, to pump surrounding air to the air trapping tank.
Description
Technical field
It is especially a kind of the present invention relates to a kind of acquisition surrounding air and the method for preparing calibration gas or medical gas
Surrounding air is acquired more than atmospheric boundary layer (Planetary Boundary Layer) and is prepared into waving for detecting
The method of the calibration gas or medical gas of hair property organic compound gas concentration.
Background technique
Air pollution has been one in the most area in Asia, especially East China and extremely serious has asked
Topic.A kind of main air pollution source is volatile organic compounds (VOCs).These volatile organic compounds include benzene, first
The toxic gas such as benzene, dimethylbenzene, formaldehyde, their source are very extensive.Outdoors, volatile organic compounds may be from firing
Industrial waste gas, vehicle exhaust, the photochemical pollution etc. that material burning and communications and transportation generate.Indoors, volatile organic compounds
It may be from the smog of the generations such as the combustion product, smoking, heating and the cooking of coal-fired and natural gas etc., building and ornament materials etc..
The not only possible smokescope for increasing earth's surface of volatile organic compounds deteriorates global climate, simultaneously to form thick weather
The health for also seriously endangering the mankind can all damage liver, kidney, brain and nervous system etc..Certain volatilizations
Property organic compound even also have extremely strong carcinogenicity, teratogenicity and mutagenicity.
In order to effectively supervise and specification gaseous effluent, aforementioned a variety of volatile organic compounds are accurately measured in sky
Concentration in gas is necessary.In certain scenes of the accident, it is also desirable to can be carried out to the concentration of volatile organic compounds gas
Real time monitoring.
Volatile organic compounds concentration field detection method commonly used in the prior art all relies on calibration gas.Volatilization
Property organic compound detector is as a Libra, and calibration gas is exactly the counterweight of Libra.In order to accurately measure sample gas
The concentration of one or more of volatile organic compounds in body needs accurately to demarcate corresponding one or more of in calibration gas
The concentration of volatile organic compounds.Therefore, one for improving volatile organic compounds accuracy in detection in sample gas is straight
Connect the calibration gas that approach is just to provide accurate calibration as far as possible.
Between in the past few decades, although the volatilization of many maturations used for field assay has been introduced in different company
Property organic compound detector, but they are substantially all using synthetic gas as calibration gas.So-called synthetic gas, refers to
Dilute a variety of different volatile organic compounds (usually hydrocarbon) with pure nitrogen gas or nitrogen-oxygen mixture and
Obtained mixed gas.The obtained synthetic gas can obtain the predetermined concentration of various volatile organic compounds.Big
Under partial picture, using this synthetic gas without too big problem in terms of accuracy of measurement.However, due to its " non-natural " gas
The essence of body, the separation in the synthetic gas and detector/mode of action of capturing device is different from natural-gas and separates/are caught
The mode of action of acquisition means.The difference of the above-mentioned mode of action makes in some cases, and detector can not obtain accurate analysis
As a result.In addition, synthetic gas is also difficult to the true surrounding air of accurate simulation, the prior art is difficult to accomplish to mention in synthetic gas
For all types of volatile organic compounds present in surrounding air.Especially certain form of greenhouse gases are synthesis gas
What body was difficult to provide.
In addition to volatile organic compounds Concentration Testing needs calibration gas, other gas detections are also required to similar
It calibration gas (Calibration Gases) reference gas standard (Reference Gas Standards) or can chase after
Trace back gas standard (Traceable Gas Standards).These gas detections are for example including atmospheric detection (atmospheric
Monitoring), Detection of Air Quality (air quality monitoring), industrial discharge detect (industrial
Emission monitoring), vehicle discharge detection (vehicle emission measuring), air blowing type alcohol screen test
(breathe alcohol testing), greenhouse gases detect (greenhouse gas monitoring), depletion of the ozone layer
Substance detects (ozone depleting substance monitoring), chlorofluorocarbons detects (CFC
Monitoring), duty peace gas detection (occupational safety air monitoring) etc..For these gas detections
Calibration gas needed for method equally faces the above problem.
Similar situation also appears in medical field.Many Medical Devices, such as blood gas analyzer need regular school
Standard is to ensure to maintain highly reliable and accuracy, to provide accurately diagnosis and treatment appropriate for patient.Therefore it provides high-quality
Calibration gas, reference gas standard or the traceable gas standard of amount are also necessary.In addition, inpatient and inhalation anesthesia etc.
Medical procedure is also required to a large amount of medical air.Using synthetic gas as medical air not only higher cost, it is also possible to cause
Unknown risk.And cost can then be reduced as substitution using surrounding air and avoid these risks.
Summary of the invention
The present invention proposes a kind of new method for preparing calibration gas or medical gas thus.Different from traditional synthesis
Gas, the present invention acquire the gas of " natural " directly from surrounding air to prepare calibration gas or medical gas.However this
It is in the past considered as being difficult to carry out.Because needing to compress ambient air into gas using compressor to collect surrounding air
In body collecting tank.If only simply carrying out squeeze operation, the collection of surrounding air is compressed by a compressor the limit of performance
System.This makes it difficult to obtain a large amount of surrounding air in a manner of cost-effective.In addition, ambient air quality is different
There are significant differences for region, and in same place in different times there is also significantly different, above-mentioned time and geographically
Air quality fluctuation causes the ambient air quality being collected into unstable, the concentration of volatile organic compounds especially in gas
May be excessively high, it makes it unsuitable for being used as calibration gas or medical gas.
And the present invention then solves the above problem by the following technical programs.
In one embodiment, the present invention provides a kind of methods for acquiring surrounding air, comprising the following steps: a. choosing
Air acquisition place is selected, the air acquisition place is located on atmospheric boundary layer；B., air trapping tank, the air are provided
Collecting tank includes tank body, valve and pressure gauge；C. cryogen feeding mechanism is provided, the cryogen feeding mechanism provides
Cryogen is with the cooling air trapping tank；And d. provides airtight pump, is connected to institute by the first air delivery pipe
Air trapping tank is stated, to pump surrounding air to the air trapping tank.
In one further embodiment, the method also includes providing the step e of the second transfer pipeline, described second
One end of transfer pipeline is connected to the airtight pump, and the other end far from the air trapping tank and is aweather arranged to extract environment sky
Gas.
In one further embodiment, the method also includes air trapping tank cleaning step is carried out before step c
Rapid f, the air trapping tank cleaning step f include pumping surrounding air to air trapping tank at least once, and be vented the sky
Gas collecting tank.
In one further embodiment, the method also includes providing the step g of heating device, the heating device
The valve and pressure gauge of the air trapping tank are heated, freeze to avoid it or blocked.
In one further embodiment, the method also includes carrying out sampling environment air using air sampling tank
Step h, the step h for carrying out sampling environment air using air sampling tank repeat more in entire surrounding air collection process
It is secondary.
In one further embodiment, the method also includes making air trapping tank restore room temperature after step d,
And therefrom remove the step i of moisture content.
In one further embodiment, after step i, the pressure in the air trapping tank is greater than 2000
psig。
In one further embodiment, the method also includes after step d by the air in air trapping tank
It distributes to the step j of multiple air storage containers with lower pressure.
In one further embodiment, the cryogen is liquid nitrogen.
In one further embodiment, the airtight pump is metal bellows pressure pump.
The present invention also provides a kind of methods for preparing calibration gas, comprising the following steps: is acquired according to method above-mentioned
Surrounding air；And k. analyzes the concentration of a variety of volatile organic compounds in the surrounding air acquired, thus described in obtaining
Calibration gas.
In one further embodiment, the calibration gas is reference gas standard or traceable gas standard.
In one further embodiment, the method also includes being analyzed in multiple air sampling tanks before step k
Air quality fluctuation step l.
In one further embodiment, the method also includes adulterating the phase to the calibration gas in the rear of step k
Hope the step m of the specific volatile organic compound gas of concentration.
In one further embodiment, the specific volatile organic compound gas includes 1,3-butadiene.
The present invention also provides a kind of methods of volatile organic compounds concentration in analysis surrounding air, including following step
It is rapid: calibration gas is prepared according to method above-mentioned；And n. is empty using calibration gas analysis sample in air detection instrument
Volatile organic compounds concentration in gas.
The present invention also provides a kind of methods for preparing medical gas, comprising the following steps: according to claim 1 in -10
Described in any item methods acquire surrounding air；And o. filters the surrounding air.
In one further embodiment, the method also includes the step of medical component is added into the surrounding air
Rapid p.
In one further embodiment, the medical component includes one of oxygen, carbon dioxide, anesthetic gases
Or it is a variety of.
In one further embodiment, the method also includes analyzing the air quality wave in multiple air sampling tanks
Dynamic step q.
The present invention also provides a kind of gas detection methods, comprising the following steps: prepares calibration gas according to method above-mentioned
Body；And the following at least one detected: atmospheric detection, Detection of Air Quality, industrial discharge is carried out using the calibration gas
Detection, vehicle discharge detection, air blowing type alcohol screen test, greenhouse gases detection, the detection of depletion of the ozone layer substance, chlorofluorocarbons inspection
It surveys and gas detection is pacified in duty.
Through the above technical solutions, the present invention can collect a large amount of available surrounding airs with very cheap cost,
The calibration gas or medical gas further prepared by these surrounding airs overcomes the problem of conventional synthesis gas is likely to occur.
The calibration gas so obtained improves the accuracy in detection of volatile organic compounds gas.It is prepared by these surrounding airs
To medical gas then reduce the application risk of patient.
Detailed description of the invention
For a better understanding of the present invention, related embodiment is illustrated now in conjunction with attached drawing, in which:
Fig. 1 shows the schematic device of acquisition surrounding air according to an embodiment of the invention；
Fig. 2 shows a part of Fig. 1 shown device, the i.e. schematic diagram of metal bellows pressure pump；
Fig. 3 shows the flow chart of the method for acquisition surrounding air according to an embodiment of the invention；
Fig. 4 show it is according to an embodiment of the invention prepare calibration gas and utilize calibration gas carry out volatility
The flow chart of the method for organic compound concentrations field assay.
Specific embodiment
The operating procedure and relevant device of the method for the present invention will be explained in greater detail below in the present invention.But the present invention and unawareness
Figure limits these steps and equipment.Each step described below and relevant device are being referred to for those skilled in the art
Later it is contemplated that equivalents and equipment, also among the scope of protection of present invention.
Acquisition principle
Often surrounding air is pumped into gas collection tank using compressor in the prior art and realizes gas collecting.With
The raising of pressure in gas collection tank, further pumped air become more difficult.The present invention is by will be in gas collection tank
The air-fluidized method that is collected into reduces pressure inside the tank, thus greatly reduces the difficulty of pumping.
In particular, gas-collecting pipe is immersed in cryogen, such as liquid nitrogen by the present invention.The evaporation of the cryogen makes
The temperature for obtaining the air in gas collecting tank is reduced to boiling point or less to liquefy.In this way, the pressure in gas collection tank is basic
Zero or so is maintained, surrounding air is constantly pumped into gas collection tank by pressure pump easily.When having pumped
Cheng Hou enables gas collection tank restore room temperature, the air evaporation collected at this time, so that the pressure in tank gradually rises, forms high pressure
Air.
Acquire place and time
Present invention surrounding air collected is used to prepare calibration gas or medical gas, and wherein calibration gas can be used for waving
Hair property organic compound detector, and medical air is for medical applications such as patient respiration or anesthesia.As previously mentioned, these air
The performance capabilities of detector depends greatly on the quality of calibration gas.Therefore, quality of the present invention to acquisition air
With very high requirement.
For the surrounding air for ensuring to be collected into desired qualities, the present invention has recognized the need to first in the enterprising of atmospheric boundary layer
The collection of row surrounding air.Atmospheric boundary layer, that is, atmosphere near earth surface, by ground friction resistance, temperature difference etc. because
The atmosphere layer region of the influence of element.Frictional resistance from various earth's surfaces various roughness elements, such as earth's surface shape, vegetation, building
With mankind's activity etc., and it is communicated up due to the turbulent flow in atmosphere and is gradually weakened.Above-mentioned factor makes the horizontal direction of atmosphere
Flow velocity uneven distribution in vertical profile forms more complicated flow field, so that wind speed, temperature and humidity etc. have significantly
Variation.Moreover, it is contemplated that be the main source of volatile organic compounds to ground, the air in atmospheric boundary layer often contain compared with
The volatile organic compounds of high concentration.This makes the ambient air quality being collected into atmospheric boundary layer unstable and unsuitable
It is used as calibration gas.
On atmospheric boundary layer, atmosphere is influenced smaller by earth's surface, and is mainly influenced by earth rotation, therefore water
Advection short-term training is uniformly distributed, and the diurnal variation of Atmospheric components is smaller.In addition, the concentration of volatile organic compounds is also opposite in atmosphere
It is lower.Therefore atmospheric boundary layer area above is the ideal source of calibration gas.
The thickness of atmospheric boundary layer is about in several hundred rice between a km.In the lower region of earth's surface frictional resistance, earth's surface
The thickness in boundary layer is often lower.Therefore, often the area even more remote in suburb carries out surrounding air acquisition, with can
It is reached on atmospheric boundary layer at compared with low altitude area.Due to less mankind's activity, there is volatility in the surrounding air in suburb
The concentration of machine compound also tends to lower.
In addition to place, acquisition time should be also reasonably selected.It is typically chosen the lesser period progress environment of temperature change
Air acquisition is preferred.In one embodiment, the acquisition work of surrounding air is carried out between selection at 11 points in the morning at 4 points in afternoon
Make.
To sum up, of the invention one crucial place is exactly that the receipts of surrounding air are carried out more than the boundary layer of atmosphere
Collection.
Equipment
In one embodiment of the invention, air acquisition device 1 needs to configure following equipment, and part is in Fig. 1
It shows:
Empty gas collection tank 10 is used to collect and storage environment air.After completing to collect and gasify, gas is received
The gas pressure collected in tank 10 can be more than 2000 pounds/square inch (psig).Therefore, gas collection tank 10 needs to have enough
Intensity.Aluminum gas collection tank is a kind of available selection, but gas collection tank made of other materials is also possible.This
Outside, need to avoid the inner wall of the component in surrounding air, especially volatile organic compounds Yu gas collection tank 10 as far as possible
Absorption or chemical reaction occurs.Therefore, it is preferred for being passivated processing to the inner surface of gas collection tank 10.The gas collection
The top of tank 10 usually has the structures such as gas valve 12 and pressure gauge 11, and wherein pressure gauge 11 being capable of gas pressure in index pot
Power.
Cryogen feedway 20 is used to constantly provide cryogen and cools down to gas collection tank 10.Often
Cryogen is for example including liquid nitrogen.The boiling point of liquid nitrogen will can be collected effectively in gas collection tank 10 at -195.79 °C
In surrounding air be converted into liquid.
Heating device (not shown) is used to avoid shadow of the water vapour by cryogen near cryogen in air
It rings and freezes in the structures such as the gas valve of gas collection tank 10 12 and pressure gauge 11, so as to cause blocking.Heating device can
Using any desired form, a non-limiting embodiment is hot water circuit.
Airtight pump 50, is used for the pumped air into gas collection tank 10.In order to collect natural surrounding air, need to keep away
Exempt from the pollution that may cause when aforementioned cooling is evaporated with cryogen.It was realized by the invention that using metal bellows pressure pump 50
The cryogen of evaporation can be avoided to the pump housing well, and then to the pollution in the surrounding air wherein pumped.It is shown in Fig. 2
The construction of metal bellows pressure pump 50 comprising 52 interfaces of input 51 and output, metal bellows 54, and be located at them it
Between check valve 53.52 interfaces of input 51 and output, check valve 53 and metal bellows 54 are tightly connected, such as weld.
At work, actuation means 55 make 54 diastole of metal bellows and compression, to realize pumping and movement of supplying gas.Wavy metal
Pipe pressure pump 50 a remarkable advantage be exactly fabulous air-tightness, this make volatilization cryogen will not pollute the pump housing and
Surrounding air therein.Certainly, other pressure pumps that can be realized good air-tightness are also possible.
Gas collection tank 10 is fluidly connected to metal bellows pressure pump 50 by gas transfer pipeline, the gas transfer pipeline
Outlet 52, and extend to remotely from the entrance 51 of metal bellows pressure pump 50 to acquire surrounding air.It is received in gas
Collecting the first gas transfer pipeline 41 between tank 10 and the outlet 52 of metal bellows pressure pump 50 can be common hose, such as
Teflon pipe；And second gas transfer pipeline 42 remotely is extended to from the entrance of metal bellows pressure pump 50 51, because of it
Need to extend larger distance, generally hard tube, such as Dekaron pipe.The second gas transfer pipeline 42 generally arranges windward,
In order to acquire surrounding air.Certainly, the pipe of other types or material is also possible.Gas transfer pipeline may also include other
Necessary pipeline, for example, by cryogen from cryogen feedway 20 be delivered to gas collection tank 10 nearby it is carried out it is cold
But cry-fluid line.
Gas sampling tank 60 has smaller volume compared to gas collection tank 10.The gas sampling tank 60 includes tank
Body 61, opening 62, valve 63 and pressure gauge 64.Gas sampling tank 60 is also used for collecting surrounding air, but its purpose is not intended to
Prepare calibration gas or medical gas, but in the lab to the surrounding air being collected into gas collection tank 10 can
It is verified by property.It needs to prepare multiple gas sampling tanks 60 thus, vacuumize process is carried out to them in advance.Utilizing air
During collecting tank 10 acquires air, it is only necessary to which the valve 63 for opening gas sampling tank may make surrounding air because of tank
Negative pressure in body 61 is sucked into gas sampling tank 60.Again it is preferred to be passivated to the inner surface of the gas sampling tank 60
Processing is adsorbed in the inner wall of gas sampling tank 60 to avoid volatile organic compounds or therewith chemically reacts.
Ancillary equipment, including but not limited to the carrier container 30 etc. of air trapping tank 10.For the carrier container 30, because
Need to be added cryogen (liquid nitrogen) thereto with cooling air collecting tank 10, therefore the carrier with well insulated effect is excellent
Choosing.One preferred embodiment is Foam Container.Certainly, other suitable thermally insulated containers are also feasible.
Surrounding air acquisition
Introduce the method for present invention acquisition surrounding air below in an example now in conjunction with Fig. 3.Those skilled in the art
, it will be observed that each step not therein is necessary.The description of each step is also not restrictive, and can be with it
He operates equivalent mode.
Firstly, it is necessary to select suitable air acquisition place according to meteorological and geographical conditions.The collecting location is usually located at
In place of countryside has certain height above sea level, to guarantee to collect the surrounding air on atmospheric boundary layer.
After reaching air acquisition place, the installation of equipment 1 is completed.The cleaning behaviour of gas collection tank 10 is carried out at this time
Make.A certain amount of surrounding air is pumped among gas collection tank 10 using metal bellows pressure pump 50, then opens valve
12 with emptying gas collecting tank 10, repeatedly repeatedly until the original gas in gas collection tank 10 is replaced by acquisition substantially
The surrounding air in place.In another embodiment, also it is contemplated that preparing the gas collection tank 10 vacuumized in advance, so as to save
Cleaning step.
Then carry out the cooling down operation of gas collection tank 10.Cryogen is imported into carrying gas from its feedway 20
In the carrier container 30 of collecting tank 10, thus by the air liquefaction in gas collection tank 10.The level of cryogen is not to be exceeded
The depth of carrier container 30 damages to equipment 1 to avoid cryogen overflow and pollutes collected surrounding air.This is low
Warm fluid is continued fully to supply to give to ensure that the air in gas collection tank 10 is fully liquefied substantially, or makes gas collection
Tank 10 maintains significant negative pressure.The delivery rate of cryogen can be controlled by observing the pressure gauge 11 of gas collection tank.Generally
For, the reading of the pressure gauge 11 should be maintained near zero.
Then the valve 12 and metal bellows pressure pump 50 of opening gas collection tank 10 carry out the acquisition work of surrounding air
Make.Due to the cooling effect of cryogen, the air of gas collection tank 10 is pumped into quickly by liquid by metal bellows pressure pump 50
Change, this make the pressure gauge 11 in gas collection tank 10 substantially remain in zero or relative to the significant negative pressure of environment level.Herein
Meanwhile it enabling heating device and freezing or block to avoid valve 12 and pressure gauge 11.
Entire collection process will continue for some time (such as 3-5 hours).During this period, it utilizes at a certain time interval
Multiple 60 multi collect surrounding airs of gas sampling tank.Each gas sampling tank 60 is marked, in subsequent laboratory
It is used in analysis.
After completing gas collecting, the valve 12 of gas collecting tank 10 is closed.Then metal is removed from gas collecting tank 10
Bellows pressure pump 50 and its other structures close cryogen supply and heating device.Finally by gas collection tank 10 from load
It takes out, is placed under room temperature in frame container 30.In the process, the liquid air in gas collecting tank 10 is upper with temperature
Rising gradually to gasify, and the pressure in final gas collecting tank will rise to such as 2000 psig or higher level.Finally, also
It may need to remove moisture content remaining in gas collecting tank 10.This is for example by being inverted gas collecting tank 10 and being briefly opened up
Valve 12 is realized.
So just complete entire surrounding air collecting flowchart.If it is desired, repeatable above-mentioned steps are to acquire multiple gas
Body acquires the surrounding air of tank 10, or can synchronize the collecting work for carrying out multiple gas collecting tanks 10.
Then, gas collecting tank 10 can be sent back to laboratory to demarcate.Alternatively, in view of in gas collecting tank 10 compared with
Compressed gas therein can be distributed into multiple storage containers with smaller pressure first, then be transported by high pressure.
Calibration gas preparation
After the acquisition for completing surrounding air, the preparation work of calibration gas or medical gas is just carried out.Fig. 4 is shown
One of embodiment.
Before this, an optional step is in the multiple gas sampling tanks 60 collected during air acquisition
Surrounding air sample is analyzed, with judge during air acquisition ambient air quality whether generation significant change.Such as
Preceding described, air environment more than atmospheric boundary layer is generally more stable, but due to certain meteorological or artificial conditions, ground
The height of layer may change in the daytime.If significant change, meaning occurs in the component for the sample gas that different periods obtain
Acquisition place sampling the same day certain periods in be in atmospheric boundary layer or less.It is collected in gas collecting tank 10 as a result,
To surrounding air may be no longer appropriate for being used to prepare calibration gas, and can only be resurveyed.
Determine that the surrounding air being collected into gas collecting tank 10, can be right suitable for calibration gas is prepared if being analyzed
The concentration of many of volatile organic compounds carries out quantitative analysis, thus to obtain calibration gas.In one embodiment, it needs
The volatile organic compounds for wanting quantitative analysis can be more than 100 kinds.
In some further embodiments, certain form of volatile organic compound artificially also is adulterated to calibration gas
Object gas.This is because service life of the part volatile organic compounds gas in atmospheric environment is very of short duration.Such as 1,3- fourth
Diene is in atmospheric environment only with several hours service life.Although this to obtain these volatile organics in acquisition
Object gas is closed, but they are significantly decomposed in quantitative analysis.And these volatile organic compounds gases are for calibrating gas
It is sometimes necessary for body.For this purpose, artificially specific volatile organic compound can be adulterated to it before using calibration gas
Object gas is to realize expectation concentration.Another reason for being doped is the ring being collected on the atmospheric boundary layer in suburb
Certain volatile organic compounds gas concentrations in the air of border may be too low, this is also unfavorable for detection accuracy.
Such situation such as occurs, then needs artificially to improve the concentration of this in calibration gas kind volatile organic compounds gas.
The calibration gas so obtained can use in gas detecting instrument.
Medical gas can also be prepared using similar method.Such as processing can be filtered to the surrounding air being collected into,
Oxygen, carbon dioxide, anesthetic gases or the component needed for other of certain concentration are added to which medical gas be made.
Sample gas on-site test
The concentration of field assay volatile organic compounds then can be used for by calibration gas made from preceding method.These
Method be it is well known to those skilled in the art, do not particularly point out herein.
The above is only some embodiments of the invention, therefore all according to construction described in the present patent application range, feature
And the equivalent change or modification that principle is done, or to any combination of multiple embodiments of the invention, it is included in the present invention
In the range of.
Claims (20)
1. a kind of method for acquiring surrounding air, comprising the following steps:
A. air acquisition place is selected, the air acquisition place is located on atmospheric boundary layer；
B. air trapping tank (10) are provided, the air trapping tank (10) includes tank body, valve (12) and pressure gauge (11)；
C. cryogen feeding mechanism (20) are provided, the cryogen feeding mechanism (20) provides cryogen to cool down
State air trapping tank (10)；And
D. airtight pump (50) is provided, the airtight pump (50) is connected to the air by the first air delivery pipe (41) and receives
Collect tank (10), to pump surrounding air to the air trapping tank (10).
2. according to the method described in claim 1, wherein include the steps that provide the second transfer pipeline (42) e, described second
One end of transfer pipeline (42) is connected to the airtight pump (50), and the other end is far from the air trapping tank (10) and arranges windward
With draw ambient air.
3. according to the method described in claim 1, wherein further including progress air trapping tank (10) cleaning step before step c
F, air trapping tank (10) the cleaning step f include pumping surrounding air to air trapping tank (10) at least once, and be vented
The air trapping tank (10).
4. the heating device is to institute according to the method described in claim 1, wherein include thing steps that providing heating device g
The valve (12) and pressure gauge (11) for stating air trapping tank (10) are heated, and are frozen or are blocked to avoid it.
5. according to the method described in claim 1, wherein further including carrying out sampling environment air using air sampling tank (60)
Step h, the step h for carrying out sampling environment air using air sampling tank (60) is heavy in entire surrounding air collection process
It is multiple multiple.
6. according to the method described in claim 1, wherein further include make after step d air trapping tank (10) restore room temperature,
And therefrom remove the step i of moisture content.
7. according to the method described in claim 6, the pressure in the air trapping tank (10) is greater than wherein after step i
2000 psig。
8. according to the method described in claim 1, wherein further including after step d by the air in air trapping tank (10) point
It is assigned to the step j of multiple air storage containers, the pressure of the air storage container is lower than the pressure of the air trapping tank.
9. method according to claim 1 to 8, wherein the cryogen is liquid nitrogen.
10. method according to claim 1 to 8, wherein the airtight pump (50) is wavy metal pipe pressure
Pump.
11. a kind of method for preparing calibration gas, comprising the following steps:
Method according to claim 1 to 10 acquires surrounding air；And
K. the concentration of a variety of volatile organic compounds in the surrounding air that analysis acquires, to obtain the calibration gas.
12. further including according to the method for claim 11, the ring analyzed before step k in multiple air sampling tanks (60)
The step l of the air quality fluctuation of border air, to judge whether ambient air quality occurs obviously to become during air acquisition
Change.
13. according to the method for claim 11, further including adulterating expectation concentration to the calibration gas in the rear of step k
The step m of specific volatile organic compound gas.
14. according to the method for claim 13, wherein the specific volatile organic compound gas includes 1,3- fourth two
Alkene.
15. a kind of method of volatile organic compounds concentration in analysis surrounding air, comprising the following steps:
According to claim 1, method described in any one of 1-14 prepares calibration gas；And
N. the volatile organic compounds concentration in calibration gas analysis sample air is used in gas detecting instrument.
16. a kind of method for preparing medical gas, comprising the following steps:
Method according to claim 1 to 10 acquires surrounding air；And
O. the collected surrounding air is filtered.
17. further including according to the method for claim 16, adding medical component into the collected surrounding air
Step p.
18. according to the method for claim 17, the medical component includes oxygen, carbon dioxide, one in anesthetic gases
Kind is a variety of.
19. further including according to the method for claim 16, the sky for analyzing the surrounding air in multiple air sampling tanks (60)
The step q of gas quality fluctuation, to judge whether ambient air quality occurs significant change during air acquisition.
20. a kind of gas detection method, comprising the following steps:
According to claim 1, method described in any one of 1-14 prepares calibration gas；And
R. the following at least one detected: atmospheric detection, Detection of Air Quality, industrial discharge is carried out using the calibration gas
Detection, vehicle discharge detection, air blowing type alcohol screen test, greenhouse gases detection, the detection of depletion of the ozone layer substance, chlorofluorocarbons inspection
It surveys and gas detection is pacified in duty.
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| CN108426751B (en) * | 2018-01-23 | 2023-11-14 | 宁波市环境监测中心 | Gas sampling device and method thereof |
| CN108168963B (en) * | 2018-01-23 | 2023-11-07 | 宁波市环境监测中心 | Multifunctional gas sampling device and method thereof |
| CN109211641B (en) * | 2018-11-08 | 2021-05-18 | 成都市环境保护科学研究院 | Device and method for accurate negative pressure humidification of atmospheric VOCs sampling tank |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU732727A1 (en) * | 1977-07-25 | 1980-05-05 | Предприятие П/Я В-2343 | Device for sampling air containing impurities |
| CN201331439Y (en) * | 2008-11-11 | 2009-10-21 | 延边大学 | Gas-liquid atmospheric sampling device |
| CN102635777A (en) * | 2012-04-26 | 2012-08-15 | 孙炜 | Production method and device of canned liquefied air |
| CN102759012A (en) * | 2011-09-07 | 2012-10-31 | 吉林森工森林空气科技开发有限公司 | Forest air collecting, sub-packaging and filling method and technology thereof |
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- 2015-10-19 CN CN201510674640.5A patent/CN106596205B/en active Active
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU732727A1 (en) * | 1977-07-25 | 1980-05-05 | Предприятие П/Я В-2343 | Device for sampling air containing impurities |
| CN201331439Y (en) * | 2008-11-11 | 2009-10-21 | 延边大学 | Gas-liquid atmospheric sampling device |
| CN102759012A (en) * | 2011-09-07 | 2012-10-31 | 吉林森工森林空气科技开发有限公司 | Forest air collecting, sub-packaging and filling method and technology thereof |
| CN102635777A (en) * | 2012-04-26 | 2012-08-15 | 孙炜 | Production method and device of canned liquefied air |
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