CN104913955B - A kind of gas sampling assembly - Google Patents
A kind of gas sampling assembly Download PDFInfo
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- CN104913955B CN104913955B CN201510232306.4A CN201510232306A CN104913955B CN 104913955 B CN104913955 B CN 104913955B CN 201510232306 A CN201510232306 A CN 201510232306A CN 104913955 B CN104913955 B CN 104913955B
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- 238000005070 sampling Methods 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000000443 aerosol Substances 0.000 claims description 31
- 238000005086 pumping Methods 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract description 24
- 230000003189 isokinetic effect Effects 0.000 abstract description 19
- 239000013618 particulate matter Substances 0.000 abstract description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000428 dust Substances 0.000 abstract description 4
- 239000003546 flue gas Substances 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 8
- 238000005259 measurement Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000003500 flue dust Substances 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- -1 dirt Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- Sampling And Sample Adjustment (AREA)
Abstract
A kind of gas sampling assembly, it is mainly made of air flow rate sensor 1, sampling mouth 3, sampling channel 4, aspiration pump 5, frequency converter 6 and flow regulator 2.In the detection sampling of flue gas, dust, particulate matter etc., to ensure reliably and fast and easily isokinetic sampling, the present apparatus measures sample point gas flow rate by air flow rate sensor 1, the gas flow rate signal measured is passed into flow regulator 2 in time at the same time, so as to calculate the flow of sampling channel, realize sampled point gas flow rate with sampled point flow matches to adjust by frequency converter, to keep in sampling process, flow velocity in sampling channel 4 is consistent with sampled point air-flow velocity, so as to fulfill isokinetic sampling, representational sample is obtained.
Description
Technical field
The present invention relates to a kind of gas sampling assembly, particularly one kind to be related to Environmental Studies and monitoring, boiler smoke, pipeline
The sampling apparatus of the aerosols such as dirt, particulate matter.
Background technology
All the time, for the gas such as particulate matter, dust particle and boiler smoke, pipeline dirt, particulate matter in environmental monitoring
Whether sol particle, must use isokinetic sampling's (i.e. isokinetic sampling) in its sampling process, related technical personnel one in field
Directly without unified understanding.Some scholars propose, since row those skilled in the art generally believe the particle for the μ of size≤0.5
For, if its influence of isokinetic sampling is inappreciable, therefore, for these examples, is missed caused by non-isokinetic sampling
Difference can generally be ignored by people, isokinetic sampling another part scholar can not be taken then to insist, according to their theoretical calculation
And experiment, if making test result accurate, it is necessary to the method for taking isokinetic sampling.
To the sampling of laminar flow clean room sub-micron particle in concerned countries standard, also regulation, which must comply with, waits power original
Then.As the related toilet of China, Japan and Germany standard in all propose should or as far as possible accomplish isokinetic sampling.Therefore gas
The isokinetic sampling of body or aerosol is approved in reality by official mission.
So-called isokinetic sampling, i.e., in sampling, the speed that gas enters sampling mouth should be equal with the speed of sampled point,.Press
According to relevant regulations, its relative error should be within -5%~+10%, to overcome caused by the effect of inertia of movement of dust particle
Dust concentration measurement error.At present, plain edition sampling pipe is generally used in real work., it is necessary to first survey at the scene during practical operation
Go out flue gas flow rate and other parameters, the flow that should control of flowmeter during then by calculating determining sampling.But flue gas flow rate
Be frequently not very stable, and some smoke behavior parameters cannot scene predicted at that time, temperature during sampling residing for spinner flowmeter
Degree, pressure, can not determine, especially the test first to unfamiliar pollution sources, difficulty is with regard to bigger in advance.Therefore, in order to
Meet the requirement of sampling location, there should be an easy, quick measuring method being adapted therewith.It can be seen from the above that it is how quick,
Convenient, it is still to wait in current academic research field and field measurement simply to realize isokinetic sampling's (i.e. isokinetic sampling)
Research and urgent problem to be solved.
The content of the invention
The present invention proposes to solve the above problems, and is inspired by actual measurement scene with construction experience, there is provided a kind of
The constant speed aerosol sampling apparatus of adjustable flow, to improve the sample rate of aerosol particle and precision.
Present invention employs following technical solution：
Gas isokinetic sampling device provided by the invention has the feature that, including：Air flow rate sensor, for surveying
The real-time flow rate V of aerosol in pilot production sample environment；Sampling channel, area of section uniformity；And it is set in turn in sampling
Sampling mouth, pumping pump group part and flow regulator on passage.
Wherein, air flow rate sensor is connected with flow regulator, and flow regulator is sensed according to gas flow rate
The real-time flow rate data V that device obtains obtains corresponding aerosol data on flows L；Being evacuated pump group part includes aspiration pump and control pumping
The frequency converter of air pump working status, frequency converter are connected with flow regulator, according to aerosol data on flows L control pumpings
Pump, the extraction flow L ＇ so as to fulfill aspiration pump are equal with aerosol flow L and real-time flow rate with aerosol matches.
Gas sampling assembly provided by the invention can also have the feature that：The cross section of sampling channel is circle.
Gas sampling assembly provided by the invention can also have the feature that：Sample mouth flare, cross-sectional area
Ecto-entad is gradually reduced.
Gas sampling assembly provided by the invention, in order to strengthen the stability of sample gas air current composition, can also have
Such feature：Mouth flare is sampled, cross-sectional area ecto-entad is gradually reduced.
Gas sampling assembly provided by the invention, reaches satisfaction sampling mouth axis and aerosol flow side in order to facilitate adjusting
To parallel requirement, can also have the feature that：Flexible hose, flexible hose are connected between sampling mouth and sampling channel
Can arbitrarily it be adjusted with the angle of the connecting pin of sampling mouth.
Gas sampling assembly provided by the invention, adjusts and is manipulated easy to grip for convenience, can also have such
Feature：Sampling channel is integrally L-shaped, including traversing section and vertical section, and sampling mouth is installed on traversing section port.
Gas sampling assembly provided by the invention, can also have the feature that：The reality of aerosol flow L and aerosol
When flow velocity V between relation be L=VS, S is the sampling channel inner section area here.
Invention effect
Control technology of the present invention and theoretical principle are simple and reliable, can higher degree guarantee isokinetic sampling.
The configuration of the present invention is simple, it is easy to operate, without in sampling and testing scene measure flue gas flow rate and other specification, greatly
The speed of big raising sampling, while avoid the influence of the trouble and inexact data of conventional method measurement parameter.
Manipulation technology to operator and the understanding to relevant professional knowledge are not strict with, only need to be by this sampling apparatus
Sampling position such as chimney is placed on, open ground etc. can complete sampling and manipulate.
It is that one kind can be most of common laborers at the scene in actual measurement sampling, researcher, what experimentalist etc. skillfully grasped
Sampling apparatus.
The device parts are the component of market mature industry, and without specially designing and producing, cost is relatively low, the scope of application
Extensively, various occasions and unit are applicable to.
Brief description of the drawings
Fig. 1 is the structure diagram of the gas sampling assembly of the present invention.
Embodiment
Illustrate the embodiment of the present invention below in conjunction with attached drawing.
Fig. 1 is the structure diagram of the gas sampling assembly of the present embodiment：
As shown in Figure 1, gas sampling assembly 100, including air flow rate sensor 1, flow regulator 2, samples mouth 3,
Sampling channel 4, aspiration pump 5 and frequency converter 6.Wherein, sample mouth 3, frequency converter 6 control aspiration pump 5 and flow regulator 2 according to
Secondary to be installed on sampling channel 4, air flow rate sensor 1 is connected with flow regulator 2, while flow regulator 2 and control
The frequency converter 6 of aspiration pump processed connects, and the real-time flow rate data V that flow regulator 2 is tested according to air flow rate sensor 1 is obtained
Corresponding aerosol data on flows L；Frequency converter 6 is connected with the flow regulator 2, according to aerosol data on flows L controls
Aspiration pump 5, the extraction flow L ＇ so as to fulfill aspiration pump are equal with aerosol flow L and real-time flow rate phase with aerosol
Match somebody with somebody, realize isokinetic sampling.
Air flow rate sensor 1 can in real time monitor and transmit real-time flow rate V in pipeline.
Formula is calculated according to fluid flow：
L=SV
Further according to fluid flow theoretical calculation formula in round tube
L=π d2v/4
Understand, when sampling channel section internal diameter d is constant, corresponding aerosol flow L only with the unique phases of real-time flow rate V
Close.Therefore it can realize that flue dust or particulate matter enter the speed and sampled point of sampling mouth by bleeding regulating pumping throughput L ＇ sizes
Flue dust or particulate matter speed it is equal, that is, realize isokinetic sampling.
The present embodiment is to determine real-time flow rate V during sampling using sensor, by the way that real-time flow rate V signal is transmitted
The adjusting to the extraction flow of aspiration pump is completed to flow regulator and then output control instruction, realizes the pumping of sampling apparatus
Throughput L ＇ are engaged with the real-time flow rate V of sampled point, realize isokinetic sampling.
The real-time flow rate V data and the section face of sampling channel that flow regulator 2 is provided according to air flow rate sensor 1
Product S, calculates and adjusts the extraction flow L ＇ of aspiration pump in real time.
It is a capturing device to sample mouth 3, is arranged at the top of sampling channel, flare, ecto-entad sectional area by
It is tapered small.Sampling mouth must be made to be directed at air flow direction during sampling, otherwise will be reduced into the particle object amount of sampling mouth, and especially be worked as and adopt
Collection sample occasion has bulky grain thing, and sampling gained concentration otherwise will be caused not to be inconsistent with discharge tube endoparticle thing actual concentrations, made
Into sampling error.The general angle of deviation for requiring sampling mouth axis and air flow direction must not exceed 5 °.In order to ensure to sample mouth alignment
Air flow direction, the present embodiment preferably sample mouth and are connected by flexible hose with sampling channel, and flexible hose is positioned at sampling mouth and adopts
Between sample passage, and the angle of the connecting pin of sampling mouth can be adjusted arbitrarily for meeting sampling mouth axis and aerosol flow direction
Parallel requirement.
Sampling channel 4 is a process channel of sampling, is prepared using metal circular tube.In order to ensure isokinetic sampling, metal
The cross-sectional area uniformity of pipe.Sampling channel is integrally L-shaped, including traversing section and vertical section, tubaeform sampling mouth peace
Mounted in traversing section port.At the scene in sampling process, which is placed in flue dust or particle conduit, in simple people
Lower its of work auxiliary can be automatically performed the overall process of sampling.
The method that aerosol sample sampling is carried out using the gas sampling assembly in the present embodiment, is comprised the following steps：
Air flow rate sensor, is placed into the appropriate location for wanting sampling position by step 1, and ensures that gas flow rate senses
The flow direction of device face sample gas, the real-time flow rate V of aerosol described in Accurate Determining；
Step 2, grip the sampling apparatus and adjust it is described sampling mouth angle so that the mouth axis of the sampling with
The angle of deviation of air flow direction is in 5 °；
Step 3, is sampled.
The foregoing is merely the better embodiment of the present invention, is not used for limiting practical range of the invention.
Claims (5)
- A kind of 1. gas sampling assembly, for gathering aerosol sample, it is characterised in that including：Air flow rate sensor, the real-time flow rate V for the aerosol in test sample environment；Sampling channel, area of section uniformity；AndSampling mouth, pumping pump group part and the flow regulator being set in turn on the sampling channel,Wherein, the air flow rate sensor is connected with the flow regulator, and the flow regulator is according to the gas The real-time flow rate data V that body flow sensor obtains obtains corresponding aerosol data on flows L,The pumping pump group part includes aspiration pump and the frequency converter of the control aspiration pump working status, the same institute of frequency converter Flow regulator connection is stated, aspiration pump is controlled according to the aerosol data on flows L, so as to fulfill the extraction flow of aspiration pump L ＇ are equal with the aerosol flow L and match with the real-time flow rate of the aerosol,Flexible hose, the connection of the flexible hose and the sampling mouth are connected between the sampling mouth and the sampling channel The angle at end can arbitrarily adjust the requirement parallel with aerosol flow direction for meeting sampling mouth axis,The sampling channel is integrally L-shaped, including traversing section and vertical section, and sampling mouth is installed on traversing section port.
- 2. gas sampling assembly according to claim 1, it is characterised in that：Wherein, the cross section of the sampling channel is circle.
- 3. gas sampling assembly according to claim 1, it is characterised in that：Wherein, the sampling mouth flare, cross-sectional area ecto-entad are gradually reduced.
- 4. gas sampling assembly according to claim 1, it is characterised in that：Wherein, the relation between the aerosol flow L and the real-time flow rate V of the aerosol is L=VS,S is the sampling channel inner section area.
- A kind of 5. method that aerosol sample sampling is carried out using gas sampling assembly described in claim 1, it is characterised in that bag Include following steps：Air flow rate sensor, is placed into the appropriate location in the place to be sampled by step 1, and ensures air flow rate sensor The flow direction of face sample gas, the real-time flow rate V of aerosol described in Accurate Determining；Step 2, grips the sampling apparatus and adjusts the angle of the sampling mouth so that the sampling mouth axis and air-flow stream To the angle of deviation in 5 °；Step 3, is sampled.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510232306.4A CN104913955B (en) | 2015-05-08 | 2015-05-08 | A kind of gas sampling assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510232306.4A CN104913955B (en) | 2015-05-08 | 2015-05-08 | A kind of gas sampling assembly |
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| CN104913955A CN104913955A (en) | 2015-09-16 |
| CN104913955B true CN104913955B (en) | 2018-04-20 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486549B (en) * | 2016-01-20 | 2018-08-03 | 四川大学 | A kind of sampling system that can realize constant flow isokinetic sampling |
| CN106497782B (en) * | 2016-09-30 | 2019-03-01 | 中国科学院深圳先进技术研究院 | A kind of air microorganism sampling device |
| CN107219156A (en) * | 2017-07-27 | 2017-09-29 | 中绿环保科技股份有限公司 | Measuring concentration of granules in certain instrument suitable for low, wet flue gas |
| CN107238517A (en) * | 2017-07-27 | 2017-10-10 | 中绿环保科技股份有限公司 | Particle monitoring sampling system |
| CN109406353B (en) * | 2017-08-16 | 2024-04-09 | 深圳智人环保科技有限公司 | Unmanned aerial vehicle, air pollution monitoring system and method |
| CN109000996A (en) * | 2018-09-11 | 2018-12-14 | 云南森雅环保科技有限公司 | A kind of smoke dust sampling device |
| CN110018154A (en) * | 2019-04-26 | 2019-07-16 | 南京信息工程大学 | A kind of aerosol detection device and method based on laser induced breakdown spectroscopy |
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2015
- 2015-05-08 CN CN201510232306.4A patent/CN104913955B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202004005627U1 (en) * | 2004-04-06 | 2004-06-24 | Holbach, Helmut | Air sample apparatus for microbiological and or chemical air samples has additional air flow sensors for monitoring flow speed of sample air during sampling |
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