CN104913955A - Gas sampling apparatus - Google Patents
Gas sampling apparatus Download PDFInfo
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- CN104913955A CN104913955A CN201510232306.4A CN201510232306A CN104913955A CN 104913955 A CN104913955 A CN 104913955A CN 201510232306 A CN201510232306 A CN 201510232306A CN 104913955 A CN104913955 A CN 104913955A
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Abstract
A gas sampling apparatus mainly comprises a gas flow velocity sensor 1, a sampling nozzle 3, a sampling channel 4, a suction pump 5, a frequency converter 6 and a flow regulator 2. The apparatus is disclosed to guarantee reliable, fast and convenient constant speed sampling in the detection sampling of flue gas, dusts and particles. The apparatus is characterized in that the gas flow velocity of a sampling point is measured through the gas flow velocity sensor 1, a measured gas flow velocity signal is timely transmitted to the flow regulator 2 in order to calculate the flow amount of the sampling channel, matching of the sampling point gas flow velocity with the sampling point gas flow is realized through adjusting by the frequency converter in order to maintain consistence of the flow velocity in the sampling channel 4 with the sampling point gas flow velocity in the sampling process, so constant speed sampling is realized in order to obtain a representative sample.
Description
Technical field
The present invention relates to a kind of gas sampling assembly, particularly one and relate to Environmental Studies and monitoring, the aerocolloidal sampling apparatuses such as boiler smoke, pipeline dirt, particle.
Background technology
All the time, for the aerosol particle such as particle, dust particle and boiler smoke, pipeline dirt, particle in environmental monitoring, isokinetic sampling's (i.e. isokinetic sampling) whether must be used, the understanding that in field, person skilled is never unified in its sampling process.Some scholars proposes, due to row, those skilled in the art generally believe for the particle of size≤0.5 μ, whether its impact of isokinetic sampling is inappreciable, therefore, for these examples, the error that non-isokinetic sampling produces generally can be ignored by people, isokinetic sampling's another part scholar can not be taked then to insist, according to their theory calculate and experiment, if make test result accurate, the method for isokinetic sampling must be taked.
To the sampling of laminar flow clean room sub-micron particle in concerned countries standard, also specify principle of power such as must following.All propose or isokinetic sampling to be accomplished in standard as China, Japan and German relevant toilet as far as possible.Therefore gas or aerocolloidal isokinetic sampling in reality approve by official mission.
So-called isokinetic sampling, namely when sampling, gas enters the speed of sampling mouth should be equal with the speed of sampled point.According to relevant regulations, its relative error should within-5% ~+10%, to overcome the dust concentration measuring error caused due to the inertia effect of movement of dust particle.At present, plain edition sampling pipe is generally used in real work.During practical operation, need first to measure flue gas flow rate and other parameters at the scene, the flow that then flowmeter should control when calculating is determined to sample.But flue gas flow rate is not often very stable, and some smoke behavior parameter can not predict at scene at that time, and temperature during sampling residing for spinner-type flowmeter, pressure, can not determine in advance, especially to the test first of unfamiliar pollution source, difficulty is just larger.Therefore, in order to meet the requirement of sampling location, easy, the measuring method fast that one should be had to adapt with it.As can be seen here, how fast, convenient, realize isokinetic sampling's (i.e. isokinetic sampling) simply and remain waiting in current academic research field and field measurement and study and problem demanding prompt solution.
Summary of the invention
The present invention proposes for solving the problem, and inspiration with construction experience on-the-spot by actual measurement, provides a kind of constant speed aerosol sampling apparatus of adjustable flow, to improve sample rate and the precision of aerosol particle.
Present invention employs following technical scheme:
Gas isokinetic sampling device provided by the invention has such feature, comprising: air flow rate sensor, for the aerocolloidal real-time flow rate V in test sample environment; Sampling channel, area of section uniformity; And the sampling mouth, aspiration pump assembly and the flow regulator that are set in turn on sampling channel.
Wherein, air flow rate sensor is connected with flow regulator, and flow regulator obtains corresponding gasoloid data on flows L according to the real-time flow rate data V that air flow rate sensor obtains; Aspiration pump assembly comprises aspiration pump and controls the frequency converter of aspiration pump duty, frequency converter is connected with flow regulator, control aspiration pump according to gasoloid data on flows L, thus the extraction flow L ＇ realizing aspiration pump is equal with gasoloid flow L and match with aerocolloidal real-time flow rate.
Gas sampling assembly provided by the invention can also have such feature: the xsect of sampling channel is for circular.
Gas sampling assembly provided by the invention can also have such feature: sampling mouth flare, cross-sectional area ecto-entad reduces gradually.
Gas sampling assembly provided by the invention, in order to strengthen the stability of sample gas air current composition, can also have such feature: sampling mouth flare, cross-sectional area ecto-entad reduces gradually.
Gas sampling assembly provided by the invention, conveniently regulate to reach and meet the requirement parallel with gasoloid flow direction of sampling mouth axis, can also have such feature: be connected with flexible hose between sampling mouth and sampling channel, the angle of the link of flexible hose and sampling mouth can regulate arbitrarily.
Gas sampling assembly provided by the invention, conveniently regulate and be convenient to grip and handle, can also have such feature: sampling channel entirety is L-shaped, comprise traversing section and vertical section, sampling mouth is arranged on traversing section port.
Gas sampling assembly provided by the invention, can also have such feature: the relation between gasoloid flow L and aerocolloidal real-time flow rate V is L=VS, and S is area of section in described sampling channel here.
Invention effect and effect
Control technology of the present invention and theoretical principle simple and reliable, can the guarantee isokinetic sampling of higher degree.
Structure of the present invention is simple, easy to operate, measures flue gas flow rate and other parameters, improve the speed of sampling greatly, avoid the trouble of classic method measurement parameter and the impact of inexact data simultaneously without the need to the scene when sampling and testing.
Manipulation technology to operator and the understanding to relevant professional knowledge are not strict with, and only this sampling apparatus need be placed on sampling position as chimney, and open ground etc. can complete sampling and handle.
At the scene in actual measurement sampling, be a kind of can be most of common laborer, researchist, the sampling apparatus of the skilled grasp such as experimentalist.
These device parts are the parts of market mature industry, and make without the need to specialized designs, cost is lower, applied widely, is applicable to various occasion and unit.
Accompanying drawing explanation
Fig. 1 is the structural representation of gas sampling assembly of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.
Fig. 1 is the structural representation of the gas sampling assembly of the present embodiment:
As shown in Figure 1, gas sampling assembly 100, comprises air flow rate sensor 1, flow regulator 2, sampling mouth 3, sampling channel 4, aspiration pump 5 and frequency converter 6.Wherein, sampling mouth 3, the aspiration pump 5 that frequency converter 6 controls and flow regulator 2 are arranged on sampling channel 4 successively, air flow rate sensor 1 is connected with flow regulator 2, flow regulator 2 is connected with the frequency converter 6 controlling aspiration pump simultaneously, and flow regulator 2 obtains corresponding gasoloid data on flows L according to the real-time flow rate data V that air flow rate sensor 1 is tested; Frequency converter 6 connects with described flow regulator 2, controls aspiration pump 5 according to gasoloid data on flows L, thus the extraction flow L ＇ realizing aspiration pump is equal with gasoloid flow L and match with aerocolloidal real-time flow rate, realizes isokinetic sampling.
Air flow rate sensor 1 can Real-Time Monitoring 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＝πd
2v/4
Known, when sampling channel cross section internal diameter d is constant, corresponding gasoloid flow L is only uniquely relevant to real-time flow rate V.Therefore can realizing flue dust or particle by bleeding regulating pump extraction flow L ＇ size, to enter the sampling speed of mouth equal with the flue dust of sampled point or particle speed, namely achieves isokinetic sampling.
Namely the present embodiment is real-time flow rate V when utilizing sensor to determine sampling, by real-time flow rate V signal being delivered to flow regulator and then exporting the adjustment that steering order has carried out the extraction flow to aspiration pump, the extraction flow L ＇ realizing sampling apparatus matches with the real-time flow rate V of sampled point, realizes isokinetic sampling.
The area of section S of the real-time flow rate V data that flow regulator 2 provides according to air flow rate sensor 1 and sampling channel, calculates and the extraction flow L ＇ of adjustment aspiration pump in real time.
Sampling mouth 3 is capturing devices, and be arranged at the top of sampling channel, flare, ecto-entad sectional area reduces gradually.Sampling mouth must be made during sampling to aim at air flow direction, otherwise the particle amount entering sampling mouth will reduce, special collecting sample occasion of working as has bulky grain thing, otherwise sampling gained concentration and discharge tube endoparticle thing actual concentrations will be caused not to be inconsistent, and causes sampling error.The deviation angle of General Requirements sampling mouth axis and air flow direction must not more than 5 °.In order to ensure that sampling mouth aims at air flow direction, the present embodiment mouth of preferably sampling is connected with sampling channel by flexible hose, flexible hose, between sampling mouth and sampling channel, can regulate arbitrarily for the requirement parallel with gasoloid flow direction of satisfied sampling mouth axis with the angle of the link of sampling mouth.
Sampling channel 4 is process channels for sampling, adopts metal circular tube preparation.In order to ensure isokinetic sampling, the cross-sectional area uniformity of metal circular tube.Sampling channel entirety is L-shaped, comprises traversing section and vertical section, and tubaeform sampling mouth is arranged on traversing section port.At the scene in sampling process, be placed in by this sampling apparatus in flue dust or particle pipeline, under simple human assistance, it can complete the overall process of sampling automatically.
Utilize the gas sampling assembly in the present embodiment to carry out the method for aerosol sample sampling, comprise the following steps:
Step one, is placed into the appropriate location of wanting sampling position by air flow rate sensor, and ensures air flow rate sensor just to the flow direction of sample gas, aerocolloidal real-time flow rate V described in Accurate Determining;
Step 2, grips described sampling apparatus and regulates the angle of described sampling mouth, makes the deviation angle of the mouth axis of described sampling and air flow direction in 5 °;
Step 3, samples.
The foregoing is only better embodiment of the present invention, be not used for limiting practical range of the present invention.
Claims (7)
1. a gas sampling assembly, for gathering aerosol sample, is characterized in that, comprising:
Air flow rate sensor, for the described aerocolloidal real-time flow rate V in test sample environment;
Sampling channel, area of section uniformity; And
Be set in turn in the sampling mouth on described sampling channel, aspiration pump assembly and flow regulator,
Wherein, described air flow rate sensor is connected with described flow regulator, and described flow regulator obtains corresponding gasoloid data on flows L according to the real-time flow rate data V that described air flow rate sensor obtains;
Described aspiration pump assembly comprises aspiration pump and controls the frequency converter of described aspiration pump duty, described frequency converter connects with described flow regulator, control aspiration pump according to described gasoloid data on flows L, thus the extraction flow L ＇ realizing aspiration pump is equal with described gasoloid flow L and match with described aerocolloidal real-time flow rate.
2. gas sampling assembly according to claim 1, is characterized in that:
Wherein, the xsect of described sampling channel is circular.
3. gas sampling assembly according to claim 1, is characterized in that:
Wherein, described sampling mouth flare, cross-sectional area ecto-entad reduces gradually.
4. gas sampling assembly according to claim 1, is characterized in that:
Wherein, be connected with flexible hose between described sampling mouth and described sampling channel, described flexible hose and the angle of the link of described sampling mouth can regulate arbitrarily for the requirement parallel with gasoloid flow direction of satisfied sampling mouth axis.
5. gas sampling assembly according to claim 1, is characterized in that:
Wherein, described sampling channel entirety is L-shaped, comprises traversing section and vertical section, and sampling mouth is arranged on traversing section port.
6. gas sampling assembly according to claim 1, is characterized in that:
Wherein, the relation between described gasoloid flow L and described aerocolloidal real-time flow rate V is L=VS,
S is area of section in described sampling channel.
7. adopt gas sampling assembly described in claim 1 to carry out a method for aerosol sample sampling, it is characterized in that, comprise the following steps:
Step one, is placed into the appropriate location in the place that will sample by air flow rate sensor, and ensures air flow rate sensor just to the flow direction of sample gas, aerocolloidal real-time flow rate V described in Accurate Determining;
Step 2, grips described sampling apparatus and regulates the angle of described sampling mouth, makes the deviation angle of the mouth axis of described sampling and air flow direction 5
.in;
Step 3, samples.
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| CN201510232306.4A CN104913955B (en) | 2015-05-08 | 2015-05-08 | A kind of gas sampling assembly |
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| CN201510232306.4A CN104913955B (en) | 2015-05-08 | 2015-05-08 | A kind of gas sampling assembly |
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| CN104913955B CN104913955B (en) | 2018-04-20 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105486549A (en) * | 2016-01-20 | 2016-04-13 | 四川大学 | Sampling system capable of realizing constant-flow isokinetic sampling |
| CN106497782A (en) * | 2016-09-30 | 2017-03-15 | 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 |
| 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 |
| CN109406353A (en) * | 2017-08-16 | 2019-03-01 | 深圳智人环保科技有限公司 | A kind of unmanned plane, air pollution surveillance system and method |
| 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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| CN104568525A (en) * | 2014-12-19 | 2015-04-29 | 苏州市华测检测技术有限公司 | Sampling pipeline structure for atmospheric sampling equipment |
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| 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 |
| CN102103044A (en) * | 2011-01-20 | 2011-06-22 | 马鞍山钢铁股份有限公司 | Isokinetic smoke dust sampling device and sampling method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486549A (en) * | 2016-01-20 | 2016-04-13 | 四川大学 | Sampling system capable of realizing constant-flow isokinetic sampling |
| CN105486549B (en) * | 2016-01-20 | 2018-08-03 | 四川大学 | A kind of sampling system that can realize constant flow isokinetic sampling |
| CN106497782A (en) * | 2016-09-30 | 2017-03-15 | 中国科学院深圳先进技术研究院 | A kind of air microorganism sampling device |
| 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 |
| CN109406353A (en) * | 2017-08-16 | 2019-03-01 | 深圳智人环保科技有限公司 | A kind of unmanned plane, air pollution surveillance system and method |
| 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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| CN104913955B (en) | 2018-04-20 |
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