CN104122180B - A kind of method measuring particulate matter mass concentration - Google Patents
A kind of method measuring particulate matter mass concentration Download PDFInfo
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- CN104122180B CN104122180B CN201410345559.8A CN201410345559A CN104122180B CN 104122180 B CN104122180 B CN 104122180B CN 201410345559 A CN201410345559 A CN 201410345559A CN 104122180 B CN104122180 B CN 104122180B
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Abstract
The present invention relates to a kind of method measuring particulate matter mass concentration, processor controls sampling pump makes air-flow enter from particulate collection unit, collect Atmospheric particulates information and judge whether need to instrument be calibrated, if needing calibration, then start β ray calibration module, the parameter value of light scattering measurement module is calibrated, after treating parametric calibration, is then turned on light scattering measurement module；As need not calibration, the most directly measured by light scattering measurement module.Light scattering method is measured particle concentration and is combined with β ray method by the present invention, has the accurate and online real-time direct-reading data of measurement concurrently；β ray calibration module, light scattering measurement module share a set of gas circuit thus ensure in calibration process various consistent, reduce error component；Utilize β ray calibration module that the parameter of light scattering measurement module is calibrated when measuring environment and changing simultaneously, measure the measurement carrying out particle concentration when environment does not changes individually with light scattering measurement module.
Description
Technical field
The present invention relates to a kind of method measuring particulate matter mass concentration, belong to measuring concentration of granules in certain field.
Background technology
The environmental pollution caused due to polluter such as Industrial Boiler, boiler of power plant and Industrial Stoves is quite serious, and this is all conducted in-depth research and is controlled by by countries in the world, and this is accomplished by detecting its particulate matter dust concentration discharged.The most conventional detection method has light scattering method, β attenuation sensors, impermeable explicit law, optical transmission method etc..
Wherein the principle of light scattering method is: the light beam from light source is irradiated in a certain space (measurement zone) containing candidate particles Nei, thus scatter, scattered light becomes the signal of telecommunication after photelectric receiver is changed, after amplified device amplifies, the mass concentration of measurement zone endoparticle thing can be calculated according to light scattering theory.These computational methods are affected by the particle diameter distribution of variable grain thing, refractive index etc., therefore need to calibrate parameter in good time.Light scattering method is measured accurately, precision is high, reproducible, and measuring speed is fast, for online direct reading measurement mode, it is not necessary to sampling, real-time continuous can provide the instantaneous value of particle concentration；But light scattering method is limited to purity and the size of particulate matter, kind or the particle size range of particulate matter change, and all can cause the change of parameter value.Therefore, when measuring environment and changing, need parameter value is modified.
The principle of β attenuation sensors is: the β ray that the β source of an intensity constant sends by medium time, beta-particle collision loss mutual with the electronics in medium energy and absorbed.Under low-energy condition, degree of absorption depends on the quality of medium, unrelated with the granularity of powder dust particle, composition, color and dispersity etc..β ray successively through cleaning filter paper (not gathering dirt sample) and having adopted dirt sample filter paper (same filter paper), is asked for dust concentration in environment according to 2 β rays by the difference of absorbtivity.β attenuation sensors is not by dust kind, granularity, the impact of the factors such as dispersion, shape, color, gloss；Measurement result can be with classical standard method weight method equivalence；It can reduce the process time of sample and contaminated chance, will not bring personal error and error free accumulation, it is not necessary to often calibration and zeroing.It is dust concentration indirect measurement method in accurate one.But it is non-direct access mode, interval of time just provides measurement data.
Also there are the problems referred to above in the additive methods such as impermeable explicit law, optical transmission method, there is presently no a kind of method can affect from ambient particle thing, frequently calibrates parameter value, again can the reading particle concentration value of real-time online.
Summary of the invention
It is an object of the invention to overcome shortcoming present in prior art, it is provided that one can affect from ambient particle thing, frequently calibrates parameter value, again can real-time online read particle concentration value measure particulate matter mass concentration method.
The purpose of the present invention is realized by below scheme: a kind of method measuring particulate matter mass concentration, processor controls sampling pump makes air-flow enter from particulate collection unit, collect Atmospheric particulates information and judge whether need to instrument be calibrated, if needing calibration, then start β ray calibration module, the parameter value of light scattering measurement module is calibrated, after treating parametric calibration, is then turned on light scattering measurement module；As need not calibration, the most directly being measured by light scattering measurement module, measurement result is shown by input/output module；Input/output module, atmosphere pressure sensor, Temperature Humidity Sensor are connected with processor；Described particulate collection unit includes PM2.5/PM10 sickle, high efficiency particulate air filter and the electromagnetic valve being connected with both；Described β ray calibration module includes filter membrane and the β source being connected with filter membrane, β ray detector and filter membrane conversion motor；Described light scattering measurement module includes optical detection chamber and the light source being attached thereto, light scattering detector；Described PM2.5/PM10 sickle, electromagnetic valve, the optical detection chamber of light scattering measurement module, the filter membrane of β ray calibration module, sampling pump are arranged in same gas circuit.
Further, described light source is White LED light source, and described light scattering detector is photomultiplier tube；Described light scattering measurement module makes light scattering measurement module identical with the precision of β ray calibration module and range holding by the luminous intensity controlling light source with the gain amplifier of amplifier in its module.
Further, high efficiency particulate air filter connected by described electromagnetic valve when school zero, removes the particulate matter in air, it is ensured that school zero precision；PM2.5/PM10 sickle is connected when measuring particle concentration.
Further, described filter membrane conversion motor, for changing the angle of filter membrane, when calibration, makes filter membrane be perpendicular to gas circuit so that particulate matter can deposit on filter membrane for follow-up weighing calibration；When measuring particle concentration, make filter membrane direction parallel with gas circuit, it is ensured that gas circuit unimpeded.
Further, described β source is C14 radioactive source, and β ray detector is fluoroscopic examination photomultiplier tube.
Further, it is additionally provided with effusion meter between filter membrane and the sampling pump of described β ray calibration module.
The invention has the beneficial effects as follows: light scattering method is measured particle concentration and combines with β ray method, be allowed to have the accurate and online real-time direct-reading data of measurement concurrently；For ensureing the concordance of measurement result, β ray calibration module, light scattering measurement module share a set of gas circuit, thus ensure that in calibration process, two modules are various consistent in running, and reduce error component；Simultaneously utilize β ray calibration module that the parameter of light scattering measurement module is calibrated when measuring environment and changing, and measure environment when not changing, carry out the measurement of particle concentration individually with light scattering measurement module.
Accompanying drawing explanation
The present invention is further elaborated with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation of the present invention.
In figure: 1, PM2.5/PM10 sickle, 2, electromagnetic valve, 3, optical detection chamber, 4, light source, 5, filter membrane, 6, β source, 7, effusion meter, 8, sampling pump, 9, filter membrane conversion motor, 10, β ray detector, 11, light scattering detector, 12, high efficiency particulate air filter, 13, processor, 14, input/output module, 15, Temperature Humidity Sensor, 16, atmosphere pressure sensor.
Detailed description of the invention
A kind of method measuring particulate matter mass concentration as shown in Figure 1, processor 13 controls sampling pump 8 makes air-flow enter from particulate collection unit, collect Atmospheric particulates information and judge whether need to instrument be calibrated, if needing calibration, then start β ray calibration module, the parameter value of light scattering measurement module is calibrated, after treating parametric calibration, is then turned on light scattering measurement module；As need not calibration, the most directly being measured by light scattering measurement module, measurement result is shown by input/output module 14；Input/output module 14, atmosphere pressure sensor 16, Temperature Humidity Sensor 15 connect processor 13；Described particulate collection unit includes PM2.5/PM10 sickle 1, high efficiency particulate air filter 12 and the electromagnetic valve 2 being connected with both；Described β ray calibration module includes filter membrane 5 and the β source 6 being connected with filter membrane, β ray detector 10 and filter membrane conversion motor 9；Described light scattering measurement module includes optical detection chamber 3 and the light source 4 being attached thereto, light scattering detector 11；Described PM2.5/PM10 sickle 1, electromagnetic valve 2, the optical detection chamber 3 of light scattering measurement module, the filter membrane 5 of β ray calibration module, sampling pump 8 are arranged in same gas circuit.
Further, described light source 4 is White LED light source, and described light scattering detector 11 is photomultiplier tube；Described light scattering measurement module makes light scattering measurement module identical with the precision of β ray calibration module and range holding by the luminous intensity controlling light source 4 with the gain amplifier of amplifier in its module.
Further, high efficiency particulate air filter 12 connected by described electromagnetic valve 2 when school zero, removes the particulate matter in air, it is ensured that school zero precision；PM2.5/PM10 sickle 1 is connected when measuring particle concentration.
Further, described filter membrane conversion motor 9, for changing the angle of filter membrane 5, when calibration, makes filter membrane 5 be perpendicular to gas circuit so that particulate matter can deposit on filter membrane 5 for follow-up weighing calibration；When measuring particle concentration, make filter membrane 5 direction parallel with gas circuit, it is ensured that gas circuit unimpeded.
Further, described β source 6 is C14 radioactive source, and β ray detector 10 is fluoroscopic examination photomultiplier tube.
Further, it is additionally provided with effusion meter 7 between filter membrane 5 and the sampling pump 8 of described β ray calibration module.
For ensureing the concordance of two module measurement results in calibration process, in the present invention, β ray calibration module, light scattering measurement module share a set of gas circuit, air-flow is under the effect of sampling pump 8, enter from PM2.5/PM10 sickle 1, sequentially pass through optical detection chamber 3, filter membrane 5, effusion meter 7, thus ensure the measurement of two modules to as if same stock air-flow, be achieved in above-mentioned in detection concordance.
Described electromagnetic valve 2 under the control of processor 13, can complete inlet air flow from PM2.5/PM10 sickle 1 to the conversion of high efficiency particulate air filter 12, the turn on automatically high efficiency particulate air filter 12 when school zero, removes the particulate matter in air, it is ensured that school zero precision；The turn on automatically PM2.5/PM10 sickle 1 when measuring particle concentration.
Described filter membrane conversion motor 9 is under the control of processor 13, it is possible to achieve by the change of the filter membrane angle in gas circuit: when needs are calibrated, and makes filter membrane 5 be perpendicular to gas circuit so that particulate matter can deposit on filter membrane 5, for follow-up weighing calibration；Normal measure particle concentration time, make filter membrane 5 direction parallel with gas circuit, it is ensured that gas circuit unimpeded.Described light source 4 is White LED light source, and described light scattering detector 11 is photomultiplier tube.Described beta ray source 4 is C14 radioactive source, and β-ray detector 10 is fluoroscopic examination photomultiplier tube.For ensureing that described calibration module and detection module have identical precision and range, can be controlled by the gain amplifier of the luminous intensity of control light source 4 and follow up amplifier.Described processor 13 drives the human-computer interaction module such as LCD display, keyboard.
In airborne particulate analyte detection, testing result is had a certain impact by meteorologic parameter, and be connected with processor 13 has Temperature Humidity Sensor 15, atmosphere pressure sensor 16 real time record meteorologic parameter, for checking and data correction.Utilize β ray calibration module that the parameter of light scattering measurement module is calibrated when measuring environment and changing, and measure environment when not changing, the measurement of particle concentration is carried out individually with light scattering measurement module, both can ensure that the degree of accuracy of particle concentration, again can direct-reading online, real-time continuous goes out measurement result.
The foregoing is only presently preferred embodiments of the present invention, be merely illustrative for the purpose of the present invention, and nonrestrictive.Those skilled in the art understands, it can be carried out many changes, amendment, even equivalence, but fall within protection scope of the present invention in the spirit and scope that the claims in the present invention are limited.
Claims (4)
1. the method measuring particulate matter mass concentration, it is characterised in that: processor (13) controls sampling pump (8)
Make air-flow enter from particulate collection unit, collect Atmospheric particulates information and judge whether instrument to be carried out school
Standard, if needing calibration, then starts β ray calibration module, the parameter value of light scattering measurement module is carried out school
Standard, is then turned on light scattering measurement module after treating parametric calibration；As need not calibration, the most directly dissipated by light
Penetrating measurement module to measure, measurement result is shown by input/output module (14)；Input/output module (14),
Temperature Humidity Sensor (15), atmosphere pressure sensor (16) connect processor (13)；Described particulate collection
Unit includes PM2.5/PM10 sickle (1), high efficiency particulate air filter (12) and the electromagnetism being connected with both
Valve (2)；Described β ray calibration module includes that filter membrane (5) and the β source (6), the β that are connected with filter membrane penetrate
Thread detector (10) and filter membrane conversion motor (9)；Described light scattering measurement module includes optical detection chamber (3)
And be attached thereto light source (4), light scattering detector (11)；Described PM2.5/PM10 sickle (1),
Electromagnetic valve (2), the optical detection chamber (3) of light scattering measurement module, the filter membrane (5) of β ray calibration module,
Sampling pump (8) is arranged in same gas circuit, and high efficiency particulate air filter (12) connected by described electromagnetic valve (2) when school zero,
Remove the particulate matter in air, it is ensured that school zero precision；Connect PM2.5/PM10 to cut when measuring particle concentration
Cutter (1), described filter membrane conversion motor (9) is used for changing the angle of filter membrane (5), when calibration, makes
Filter membrane (5) is perpendicular to gas circuit so that particulate matter can deposit on filter membrane (5) for follow-up weighing calibration；
When measuring particle concentration, make filter membrane (5) direction parallel with gas circuit, it is ensured that gas circuit unimpeded.
The method of measurement particulate matter mass concentration the most according to claim 1, it is characterised in that: described light source
(4) being White LED light source, described light scattering detector (11) is photomultiplier tube；Described light scattering is surveyed
Amount module makes light scattering survey by the luminous intensity controlling light source (4) with the gain amplifier of amplifier in its module
Amount module is identical with the precision of β ray calibration module and range holding.
The method of measurement particulate matter mass concentration the most according to claim 1, it is characterised in that: described β source
(6) being C14 radioactive source, β ray detector (10) is fluoroscopic examination photomultiplier tube.
The method of measurement particulate matter mass concentration the most according to claim 1, it is characterised in that: described β penetrates
It is additionally provided with effusion meter (7) between filter membrane (5) and the sampling pump (8) of line calibration module.
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| CN201410345559.8A CN104122180B (en) | 2014-07-21 | 2014-07-21 | A kind of method measuring particulate matter mass concentration |
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| CN201410345559.8A CN104122180B (en) | 2014-07-21 | 2014-07-21 | A kind of method measuring particulate matter mass concentration |
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| CN104122180B true CN104122180B (en) | 2016-08-24 |
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