CN109781598A - A kind of measuring concentration of granules in certain device and method using white LED light source - Google Patents
A kind of measuring concentration of granules in certain device and method using white LED light source Download PDFInfo
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- CN109781598A CN109781598A CN201910249416.XA CN201910249416A CN109781598A CN 109781598 A CN109781598 A CN 109781598A CN 201910249416 A CN201910249416 A CN 201910249416A CN 109781598 A CN109781598 A CN 109781598A
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- 238000005070 sampling Methods 0.000 claims abstract description 81
- 239000007789 gas Substances 0.000 claims abstract description 74
- 239000013618 particulate matter Substances 0.000 claims abstract description 60
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000003546 flue gas Substances 0.000 claims abstract description 50
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Abstract
The present invention discloses a kind of measuring concentration of granules in certain device and method using white LED light source, including sample gas heating and gasifying pretreatment unit, particulate matter quality concentration measuring unit, isokinetic sampling's control unit and sampling detection gun.Sample gas heating and gasifying pretreatment unit, abundant heating and gasifying processing is carried out to sampling gas, make under the conditions of meeting dry flue gas and wet flue gas (flue-gas temperature is lower than dew point) use environment, the on-line monitoring of particulate matter quality concentration eliminates influence of the drop to accuracy of measurement；Particulate matter quality concentration measuring unit using the measurement method of preceding scattering, carries out processing operation to scattered light signal, obtains the mass concentration value of sample aerated particle object using the white light LEDs for containing all continuous visible wavelengths as light source；Isokinetic sampling's control unit includes frequency conversion aspiration pump, flue gas flow rate measuring device, isokinetic sampling's controller, sample introduction flow velocity measuring flow meter, forms close loop control circuit, make measuring cell sample introduction flow velocity real-time tracking flue gas flow rate, realizes isokinetic sampling.
Description
Technical field
Datamation acquisition and analysis instrument the present invention relates to environmental protection industry (epi), and in particular to pollutant emission monitoring with
Measuring device, specifically a kind of measuring concentration of granules in certain device and method using white LED light source.
Background technique
With the development of modern industry, problem of environmental pollution progresses into the visual field of people, and especially China is more in recent years
Continuous haze weather occurs on a large scale for area, makes entire society to air pollution problems inherent especially to the concern journey of suspended particulate substance
Degree gradually increases.Suspended particulate refers to PM1, PM2.5, PM10 in atmosphere.Equal solia particle of the partial sizes less than 100 μm.Study table
Bright: particulate matter is the major pollutants for causing haze weather to pollute, and partial size can be deposited on less than the particulate matter of 10 μm of partial sizes and exhale
Road is inhaled, particle of the partial size less than 2 μm can enter bronchus and alveolar, seriously polluted atmospheric environment and affected the mankind and be good for
Health.Therefore, the accurate measurements of atmosphere suspended particulate and prevention and control also become current extremely urgent problem.
Currently, mainly having trace oscillating balance method, β attenuation sensors and title for the measurement method of suspended particulate both at home and abroad
Three kinds of weight method.Trace oscillating balance method is that measurement suspended particulate substance quality is dense based on conical component concussion microbalance principle
Degree, measurement sensitivity degree are higher；But measurement cost is higher and is affected by humidity.β attenuation sensors pass through measurement filter membrane
Upper suspended particulate substance calculates the absorption intensity of beta radiation particulate matter quality concentration, can be realized automatic, real-time measurement；But
Radioactive isotope has been used in measurement, has been measured larger by man's activity.Weight method is 15432-1995 standard of China GB/T
The defined measurement method to particle is calculated by sampling weight difference and measured gas volume of the front and back particulate matter on filter membrane
Obtain the concentration of particulate matter.The principle of measurement is simple, and data are reliable, and precision is high；But timeliness is low, is unable to real-time measurement, easily induces one
Human error.
Mie particle light scattering principle is the theoretical foundation of light scattering method particle detections.When light beam is incident on particulate matter,
Light scattering phenomenon occurs for incident light.In the case where particulate matter characteristic is certain, scattered light intensity and particulate matter quality concentration are at line
Sexual intercourse.By measuring scattered light intensity, particulate matter quality concentration can be obtained according to reduction formula.Analysis is it is found that light scattering method has
Have that measurement range is wide, wide adaptability, influence of polarized light error is small, intelligent micromation degree is higher, can continuous real-time measurement, original
Manage the advantages that simple, practical.
Current with good grounds Mie particle light scattering principle, the measuring concentration of granules in certain device of design, but all swashed using monochromatic
Light is as light source.According to Mie KPT Scatter theory analysis, the scattered light intensity of suspended particulate is distributed by lambda1-wavelength, particulate matter
The influence of diameter, particulate matter refractive index.Therefore in particulate matter component complexity, especially flue gas, industrial gas emission monitoring, very
Hardly possible realizes accurate measurement.
Summary of the invention
In order to overcome the above technical defects, the purpose of the present invention is be directed to flue gas, the Industry Waste of particulate matter component complexity
In gas emission monitoring, a kind of measuring concentration of granules in certain device and method using white LED light source is provided, which is a kind of energy
Enough accurate measurement continuous on-Line Monitor Devices of discharged particle mass concentration, and meet answering under dry flue gas and wet flue gas condition
With, and realize isokinetic sampling.
To achieve the goals above, the technical solution adopted in the present invention is as follows:
A kind of measuring concentration of granules in certain device using white LED light source, including sample gas heating and gasifying pretreatment unit,
Rifle is visited in grain amount of substance concentration measuring unit, isokinetic sampling's control unit and sampling, and isokinetic sampling's control unit includes isokinetic sampling
Controller and the flowmeter being connected with isokinetic sampling's controller, air-introduced machine and flow rate measuring device；Sampling visits rifle for acquiring
Flue gas in flue, the sample gas outlet that rifle is visited in sampling are connect with sample gas heating and gasifying pretreatment unit, and sample gas heating and gasifying is located in advance
It manages unit and is used to carry out sampling gas abundant heating and gasifying processing, the return air outlet that rifle is visited in sampling is connected to flue, the heating of sample gas
The outlet of gasification pretreatment unit is connected with the entrance of flowmeter, and the outlet of flowmeter and particulate matter quality concentration measuring unit connect
It connects, the outlet of particulate matter quality concentration measuring unit is connected with air-introduced machine, and the return air inlet of rifle is visited in the outlet of air-introduced machine with sampling
Connection；The frequency converter for speed regulation is connected on air-introduced machine, frequency converter is connect with isokinetic sampling's controller, air-introduced machine isokinetic sampling
Controller controls frequency converter frequency, adjusts and connect air-introduced machine sucking rate；The detection light source of particulate matter quality concentration measuring unit
For the white light LEDs comprising whole visible lights；Flow rate measuring device is installed at flue, for measuring flue gas flow rate in flue.
Sample gas heating and gasifying pretreatment unit includes vaporizer and heating controller, and heating controller is connected simultaneously with vaporizer
For controlling the temperature of vaporizer, the sample gas outlet of rifle, the outlet of vaporizer and flow are visited in the entrance of vaporizer and sampling
The entrance of meter is connected to.
Particulate matter quality concentration measuring unit includes white light LEDs, measuring cell, photoelectric detection system and signal processing unit,
The entrance of measuring cell and the outlet of flowmeter, the outlet of measuring cell are connected to the entrance of air-introduced machine, and white light LEDs are installed on survey
On the pool wall for measuring pond, the light beam that white light LEDs issue is vertical with the sample introduction direction of measuring cell；Photoelectric detection system is mounted on and incidence
Light angle is 30 ° of positions；Signal processing unit is connect with photoelectric detection system, and signal processing unit according to Photoelectric Detection for filling
Set the particulate matter quality concentration in the scattered light intensity calculating flue gas of measurement.
Signal processing unit includes that signal processor, particle concentration calculator and the output of particulate matter quality concentration signal are single
Member, signal processor, particle concentration calculator and particulate matter quality concentration signal output unit are sequentially connected；Signal processor
Also it is connect with photoelectric detection system.
The optical wavelength that the white light LEDs issue includes the light wave of 380nm~720nm.
A kind of measuring concentration of granules in certain method using white LED light source, process are as follows:
The flow velocity of the flow rate measuring device detection flue gas in flue and flue gas flow rate signal that will test is transferred to constant speed and takes
Sample controller；
Isokinetic sampling's controller controls the frequency of frequency converter, adjusts the sucking rate of air-introduced machine, and the sample gas for making sampling visit rifle enters
Flue gas in mouth acquisition flue, using the flue gas of acquisition as sample gas, sampling visits the sample gas of rifle acquisition successively through sample gas heating and gasifying
The return air inlet that rifle is visited from sampling is drained into after pretreatment unit, flowmeter and particulate matter quality concentration measuring unit by air-introduced machine,
Rifle is visited by sampling again and flows back to flue；
When sample gas is through sample gas heating and gasifying pretreatment unit, sample gas heating and gasifying pretreatment unit carries out the sample gas of acquisition
Abundant heating and gasifying processing；
When sample gas is through flowmeter, sample introduction flow velocity signal is simultaneously transferred to isokinetic sampling's control by the flow velocity of flowmeter measurement sample gas
Device；
Isokinetic sampling's controller is according to the flue gas flow rate signal of flow rate measuring device and the sample introduction flow velocity signal of flowmeter
The frequency for adjusting frequency converter, adjusts the sucking rate of air-introduced machine, makes the sample introduction stream of particulate matter quality concentration measuring unit unit time
Amount is equal to the flue gas flow that rifle air inlet open area is visited in unit time sampling；
Particulate matter quality concentration measuring unit is using the white light LEDs comprising whole visible wavelengths to the particulate matter in sample gas
Concentration measures.
Compared with prior art, the invention has the following beneficial effects:
Measuring concentration of granules in certain device using white LED light source of the invention is using in flow rate measuring device detection flue
The flow velocity of the flue gas and flue gas flow rate signal that will test is transferred to isokinetic sampling's controller；Isokinetic sampling's controller is for controlling
Air-introduced machine work makes sampling visit the flue gas in the sample gas inlet acquisition flue of rifle, and using the flue gas of acquisition as sample gas, rifle is visited in sampling
The sample gas of acquisition is successively by air inducing after sample gas heating and gasifying pretreatment unit, flowmeter and particulate matter quality concentration measuring unit
Machine drains into flue；Sample gas heating and gasifying pretreatment unit is used to carry out abundant heating and gasifying processing to the sample gas flowed through；Flowmeter
For measuring the flow velocity of the sample gas flowed through and sample introduction flow velocity signal being transferred to isokinetic sampling's controller；Isokinetic sampling's controller is used
According to the flue gas flow rate signal of flow rate measuring device and the sample introduction flow velocity signal control frequency converter and air-introduced machine of flowmeter
Work makes in particulate matter quality concentration measuring unit in the unit time flow of sample gas and unit time sampling visit rifle air inlet and cuts
The flue gas flow of area is equal, and particulate matter quality concentration measuring unit measures sample aerated particle object concentration at this time, measurement
Particle concentration in sample gas is the particle concentration in flue gas in flue.The survey of the invention it can be seen from above content
Amount device is that one kind can accurately measure the device that discharged particle mass concentration is continuously monitored on-line, and can satisfy dry flue gas
With the application under wet flue gas condition, and realize isokinetic sampling.Meanwhile the present invention uses and contains whole continuous visible wavelengths
White light LEDs can be remarkably reinforced scattered light intensity, improve the accuracy measured as detection light source, so that the particle of measurement
The diameter coverage area of object is bigger.
By the beneficial effect of aforementioned present invention measuring device it is found that the particle concentration of present invention application white LED light source
Measurement method obtains that accuracy of measurement is higher, and the diameter coverage area of the particulate matter of measurement is bigger.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that the present invention applies white LED light source granularity object apparatus for measuring concentration.
Fig. 2 is the structural schematic diagram of particulate matter quality concentration measuring unit of the present invention.
Fig. 3 is the circuit module logic chart that the present invention applies white LED light source granularity object apparatus for measuring concentration.
Specific embodiment
With reference to embodiment and compares attached drawing invention is further explained.
As depicted in figs. 1 and 2, the measuring concentration of granules in certain device of the invention using white LED light source, including sample gas add
Rifle, isokinetic sampling's control are visited in thermal evaporation pretreatment unit, particulate matter quality concentration measuring unit, isokinetic sampling's control unit and sampling
Unit processed includes isokinetic sampling's controller and the flowmeter being connected with isokinetic sampling's controller, air-introduced machine and flow velocity measurement dress
It sets, air-introduced machine provides the power for extracting sample gas；Sampling visits rifle and is used to acquire the flue gas in flue, and sampling visits rifle and is vertically mounted on cigarette
On road, the sample gas outlet that rifle is visited in sampling is connect with sample gas heating and gasifying pretreatment unit, and sample gas heating and gasifying pretreatment unit is used
In to the abundant heating and gasifying processing of sampling gas progress, the outlet and the entrance phase of flowmeter of sample gas heating and gasifying pretreatment unit
Even, the outlet of flowmeter connect with particulate matter quality concentration measuring unit, the outlet of particulate matter quality concentration measuring unit with draw
Blower is connected, and the outlet of air-introduced machine is connect with the return air inlet that rifle is visited in sampling；The frequency converter for speed regulation is connected on air-introduced machine,
Air-introduced machine is connect by frequency converter with isokinetic sampling's controller；The detection light source of particulate matter quality concentration measuring unit is white light
LED, white light LEDs refer to comprising entire visible-range (380nm~720nm), and are provided with the LED light source of sufficient luminous intensity；
Flow rate measuring device is set at flue, for measuring flue gas flow rate.The detecting location of flow rate measuring device is on flue
The upwind of rifle is visited in sampling.The return air outlet that rifle is visited in sampling is connected to flue.
Wherein, sample gas heating and gasifying pretreatment unit includes vaporizer and heating controller, heating controller and vaporizer
It is connected and is used to control the temperature of vaporizer, the sample gas outlet of rifle, the outlet of vaporizer are visited in the entrance of vaporizer and sampling
It is connected to the entrance of flowmeter.As shown in Fig. 2, particulate matter quality concentration measuring unit includes at white light LEDs, measuring cell and signal
Manage unit, the entrance of measuring cell and the outlet of flowmeter, the outlet of measuring cell be connected to the entrance of air-introduced machine and with sampling
The gas returning port for visiting rifle is connected, and constitutes return-air road, and the gas after being measured returns to flue by return-air road；White light LEDs are installed on
On the pool wall of measuring cell, the light beam that white light LEDs issue is vertical with the sample introduction direction of measuring cell；Signal processing unit be installed on it is white
Light LED incident light measures scattered light intensity at the position of 30 ° of angles, calculates in flue gas according to the scattered light intensity of measurement
Grain amount of substance concentration.Flowmeter uses Venturi meter and is mounted on the entry position of measuring cell, measures sample introduction flow velocity.Signal
Processing unit includes photoelectric conversion unit, signal processor, particle concentration calculator and the output of particulate matter quality concentration signal
Unit, photoelectric conversion unit are set in the optical path of scattering light of white light LEDs, and photoelectric conversion unit is connect with signal processor,
Signal processor, particle concentration calculator and particulate matter quality concentration signal output unit are sequentially connected.Photoelectric conversion unit
It is set in the optical path for being 30 ° with the scattering light angle of white light LEDs, photoelectric conversion unit measures scattered light intensity signal.Scatter light
By photoelectric conversion, amplification, calculation process, compares and obtain particulate matter quality concentration value in sample gas.And it is dense to export particulate matter quality
Spend signal.
Referring to Fig. 3, isokinetic sampling's controller compares calculation process to flue gas flow rate and sample introduction flow velocity, generates frequency converting induced draft fan
Signal is controlled, the revolving speed of air-introduced machine is adjusted by frequency converter, changes sample introduction flow velocity real-time tracking flue gas flow rate, realizes that constant speed takes
Sample.
Application of the invention contains the measuring concentration of granules in certain method process of the white LED light source of whole visible wavelengths
It is as follows:
The flow velocity of the flow rate measuring device detection flue gas in flue and flue gas flow rate signal that will test is transferred to constant speed and takes
Sample controller；
Isokinetic sampling's controller controls air-introduced machine work, and sampling is made to visit the flue gas in the sample gas inlet acquisition flue of rifle, with
As sample gas, the sample gas that rifle acquisition is visited in sampling is successively drawn after vaporizer, Venturi meter and measuring cell the flue gas of acquisition
Blower drains into the return air inlet that rifle is visited from sampling, then visits rifle by sampling and drain into flue；
When sample gas is through vaporizer, vaporizer carries out abundant heating and gasifying processing to the sample gas of acquisition, meets the present apparatus
Under dry flue gas and wet flue gas (flue-gas temperature is lower than dew point) environmental condition, influence of the drop to accuracy of measurement is eliminated；
Sample introduction flow velocity signal is simultaneously transferred to by sample gas through venturi flow timing, the flow velocity of Venturi meter measurement sample gas
Isokinetic sampling's controller；
Isokinetic sampling's controller is according to the flue gas flow rate signal of flow rate measuring device and the sample introduction stream of Venturi meter
Fast signal control frequency converter and air-introduced machine work, are equal to the sample introduction flow of particulate matter quality concentration measuring unit unit time
The flue gas flow of rifle air inlet open area is visited in unit time sampling；
Particulate matter quality concentration measuring unit uses white light LEDs and measures to the particle concentration in sample gas.
According to Mie scattering principle, under conditions of light beam wavelength and certain particulate matter characteristic, the quality of suspended particulate substance is dense
Degree and scattered light intensity size are linear.Suspended particulate scattered light intensity distribution with lambda1-wavelength, particulate matter diameter,
Grain object refractive index is related.It can be obtained by emulation experiment, refractive index difference is smaller on scattered light intensity influence, can ignore；?
Grain object speciality it is certain under conditions of, with the increase of lambda1-wavelength, scattered light intensity be concentrated mainly on before to low-angle by gradually
Variation is preceding into slightly larger angle to concentrate on；Under conditions of lambda1-wavelength is certain, particulate matter diameter is bigger, and scattered light intensity is got over
Greatly, before more concentrating on into low-angle, with the increase of particulate matter diameter, forward-scattering angle is smaller.
It is simpler, conveniently in order to design, accurately measure the mass concentration information of 0.1~10 μm of particle.Of the invention
Particulate matter quality concentration measuring unit is dissipated using the white light LEDs for containing all continuous visible wavelengths as light source using preceding
The measurement method penetrated, and scattered light signal is measured, handles operation, according to Mie particle light scattering principle, calculate sample gas
The concentration value of grain object, therefore scattered light intensity can be remarkably reinforced in the present invention, hence it is evident that the precision of measurement is improved, the particulate matter of measurement
Diameter coverage area is bigger.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Several equivalent substitute or obvious modifications are made under the premise of not departing from present inventive concept, and performance or use is identical, then should
It is considered as belonging to present invention protection scope determined by the appended claims.
Claims (6)
1. a kind of measuring concentration of granules in certain device using white LED light source, which is characterized in that locate in advance including sample gas heating and gasifying
It manages unit, particulate matter quality concentration measuring unit, isokinetic sampling's control unit and sampling and visits rifle, isokinetic sampling's control unit includes
Isokinetic sampling's controller and the flowmeter being connected with isokinetic sampling's controller, air-introduced machine and flow rate measuring device；Rifle is visited in sampling
For acquiring the flue gas in flue, the sample gas outlet that rifle is visited in sampling is connect with sample gas heating and gasifying pretreatment unit, the heating of sample gas
The pretreatment unit that gasifies is used to carry out abundant heating and gasifying processing to sampling gas, and the return air outlet that rifle is visited in sampling is connected to flue,
The outlet of sample gas heating and gasifying pretreatment unit is connected with the entrance of flowmeter, and the outlet of flowmeter and particulate matter quality concentration are surveyed
Unit connection is measured, the outlet of particulate matter quality concentration measuring unit is connected with air-introduced machine, and rifle is visited in outlet and the sampling of air-introduced machine
Return air inlet connection；The frequency converter for speed regulation is connected on air-introduced machine, frequency converter is connect with isokinetic sampling's controller；Particulate matter
The detection light source of mass concentration measuring unit is the white light LEDs comprising whole visible lights；Flow rate measuring device is installed at flue,
For measuring flue gas flow rate in flue.
2. a kind of measuring concentration of granules in certain device using white LED light source according to claim 1, which is characterized in that
Sample gas heating and gasifying pretreatment unit includes vaporizer and heating controller, and heating controller is connected with vaporizer and is used to control
The sample gas outlet of rifle, the outlet of vaporizer and the entrance of flowmeter are visited in the temperature of vaporizer, the entrance of vaporizer and sampling
Connection.
3. a kind of measuring concentration of granules in certain device using white LED light source according to claim 1, which is characterized in that
Particulate matter quality concentration measuring unit includes white light LEDs, measuring cell, photoelectric detection system and signal processing unit, measuring cell
The outlet of entrance and flowmeter, the outlet of measuring cell are connected to the entrance of air-introduced machine, and white light LEDs are installed on the pond of measuring cell
On wall, the light beam that white light LEDs issue is vertical with the sample introduction direction of measuring cell；Photoelectric detection system is mounted on is with incident light angle
30 ° of positions；Signal processing unit is connect with photoelectric detection system, what signal processing unit was used to be measured according to photoelectric detection system
Scattered light intensity calculates the particulate matter quality concentration in flue gas.
4. a kind of measuring concentration of granules in certain device using white LED light source according to claim 3, which is characterized in that
Signal processing unit includes signal processor, particle concentration calculator and particulate matter quality concentration signal output unit, signal
Processor, particle concentration calculator and particulate matter quality concentration signal output unit are sequentially connected；Signal processor also with light
Electric detection means connection.
5. a kind of measuring concentration of granules in certain device using white LED light source according to claim 1, which is characterized in that
The optical wavelength that the white light LEDs issue includes the light wave of 380nm~720nm.
6. a kind of measuring concentration of granules in certain method using white LED light source, which is characterized in that any using claim 1-5
It is carried out described in one using the measuring concentration of granules in certain device of white LED light source, process is as follows:
Flow rate measuring device detects the flow velocity of flue gas in flue and the flue gas flow rate signal that will test is transferred to isokinetic sampling's control
Device processed；
Isokinetic sampling's controller controls the frequency of frequency converter, adjusts the sucking rate of air-introduced machine, and the sample gas inlet for making sampling visit rifle is adopted
Collect the flue gas in flue, using the flue gas of acquisition as sample gas, the sample gas that rifle acquisition is visited in sampling is successively located through sample gas heating and gasifying in advance
It is drained by air-introduced machine from the return air inlet for sampling spy rifle after reason unit, flowmeter and particulate matter quality concentration measuring unit, then by
Sampling visits rifle and flows back to flue；
When sample gas is through sample gas heating and gasifying pretreatment unit, sample gas heating and gasifying pretreatment unit carries out the sample gas of acquisition abundant
Heating and gasifying processing；
When sample gas is through flowmeter, sample introduction flow velocity signal is simultaneously transferred to isokinetic sampling's controller by the flow velocity of flowmeter measurement sample gas；
Isokinetic sampling's controller is adjusted according to the flue gas flow rate signal of flow rate measuring device and the sample introduction flow velocity signal of flowmeter
The frequency of frequency converter adjusts the sucking rate of air-introduced machine, makes the sample introduction flow etc. of particulate matter quality concentration measuring unit unit time
The flue gas flow for visiting rifle air inlet open area is sampled in the unit time；
Particulate matter quality concentration measuring unit is using the white light LEDs comprising whole visible wavelengths to the particle concentration in sample gas
It measures.
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| CN114324098A (en) * | 2022-03-10 | 2022-04-12 | 南京波瑞自动化科技有限公司 | Double-light-path laser forward scattering particulate matter concentration measuring device |
| CN114441418A (en) * | 2022-01-28 | 2022-05-06 | 天津凌视科技有限公司 | Imaging system, imaging method and readable storage medium for high-speed flowing particles |
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