CN107132165B - Method and device for measuring dust mass concentration value - Google Patents
Method and device for measuring dust mass concentration value Download PDFInfo
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- CN107132165B CN107132165B CN201710407892.0A CN201710407892A CN107132165B CN 107132165 B CN107132165 B CN 107132165B CN 201710407892 A CN201710407892 A CN 201710407892A CN 107132165 B CN107132165 B CN 107132165B
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- 239000000428 dust Substances 0.000 title claims abstract description 136
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000002245 particle Substances 0.000 claims abstract description 46
- 238000001514 detection method Methods 0.000 claims abstract description 40
- 238000004364 calculation method Methods 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 238000000149 argon plasma sintering Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 description 18
- 238000012360 testing method Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000013102 re-test Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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Abstract
The invention relates to the technical field of environment detection equipment, in particular to a method and a device for measuring a dust mass concentration value. A method of measuring a dust mass concentration value, comprising: obtaining C with at least one dust detection device1、C2、……、CnN is a natural number of 2 or more, wherein CnIs a particle size value equal to phinCPM value of dust, and phi1＞Φ2＞……＞Φn(ii) a Obtaining and C1、C2、……、CnRespectively corresponding to K1、K2、……、KnWherein, K isnIs a particle size value equal to phinThe conversion coefficient of the mass concentration of the dust; judging whether C is satisfied1≥C2≥……≥CnIf yes, the calculation device is used to obtain the particle size value equal to phi1Mass concentration value M, M ═ C of the dust1*K1－C2*K1+C2*K2－……－Cn*Kn‑1+Cn*Kn. Compared with the prior art, the method and the device can obtain a more accurate dust mass concentration value.
Description
Technical Field
The invention relates to the technical field of environment detection equipment, in particular to a method and a device for measuring a dust mass concentration value.
Background
In environmental detection processes such as road dust, construction site dust, industrial process dust and the like, a dust mass concentration value is very important detection data.
In the prior art, the dust mass concentration value is obtained by the following steps: taking the dust mass concentration value with the particle diameter value phi as an example, a dust meter is used to detect the CPM of the dust with the particle diameter value phi, the CPM is a shorthand of Counts per minute and means a count value per minute, or a concentration value measured by the dust meter per minute, the value is not determined by the characteristics of the dust to be measured, but is a relative concentration obtained by the characteristics of the dust meter, therefore, after the CPM is obtained, a coefficient K needs to be added, the coefficient K represents a conversion coefficient between the CPM and the dust mass concentration value, and the dust mass concentration value with the particle diameter value equal to phi is definedConcentration value of MΦ(mg/m3)，MΦ＝CPMΦ*KΦ。
The inventor of the invention finds that certain error exists in the dust mass concentration value obtained by the measurement mode in the prior art, and simply speaking, the formula M is utilizedΦ＝CPMΦ*KΦWhen dust with a larger particle size value is measured, the dust with a smaller particle size value in the air is amplified by the K value, so that the measured dust mass concentration value is slightly larger than the actual dust mass concentration value.
Disclosure of Invention
The invention aims to provide a method and a device for measuring a dust mass concentration value, which can obtain a more accurate dust mass concentration value.
In order to solve the technical problem, an embodiment of the present invention provides a method for measuring a dust mass concentration value, including:
obtaining C with at least one dust detection device1、C2、……、CnN is a natural number of 2 or more, wherein CnIs a particle size value equal to phinCPM value of dust, and phi1＞Φ2＞……＞Φn；
Obtaining and C1、C2、……、CnRespectively corresponding to K1、K2、……、KnWherein, K isnIs a particle size value equal to phinThe conversion coefficient of the mass concentration of the dust;
judging whether C is satisfied1≥C2≥……≥Cn；
If yes, the calculation device is used to obtain the particle size value equal to phi1Mass concentration value M, M ═ C of the dust1*K1－C2*K1+C2*K2－……－Cn*Kn-1+Cn*Kn。
The embodiment of the invention also provides a measuring device for the dust mass concentration value, which comprises:
at least one dust detection deviceIs used for obtaining C1、C2、……、CnN is a natural number of 2 or more, wherein CnIs a particle size value equal to phinCPM value of dust, and phi1＞Φ2＞……＞Φn；
An acquisition module for acquiring with C1、C2、……、CnRespectively corresponding to K1、K2、……、KnWherein, K isnIs a particle size value equal to phinThe conversion coefficient of the mass concentration of the dust;
a judging module for judging whether C is satisfied1≥C2≥……≥Cn；
A calculation module for obtaining a particle size value equal to phi1Mass concentration value M, M ═ C of the dust1*K1－C2*K1+C2*K2－……－Cn*Kn-1+Cn*Kn。
Compared with the prior art, the method and the device can obtain a more accurate dust mass concentration value. For example, PM is measured in a prior art measurement10The formula of the mass concentration value is as follows: m10＝C10*K10Wherein M is10Is PM10Mass concentration value of, K10For measuring PM10Value of K in time, C10For measuring PM10CPM value of time;
similarly, in measuring PM2.5The formula of the mass concentration value is as follows: m2.5＝C2.5*K2.5Wherein M is2.5Is PM2.5Mass concentration value of, K2.5For measuring PM2.5Value of K in time, C2.5For measuring PM2.5CPM value of time;
the above formula can be understood by merging and decomposing:
M10＝C10*K10＝(C2.5+C2.5～10)*K10＝C2.5*K10+C2.5～10*K10，
the problem is that the PM is actually being measured10During the process, the particle size range of the particulate matters capable of entering a dust meter measuring chamber is 0-10 microns, wherein PM2.5Are also included therein. K2.5 must be smaller than K10 due to the particle size of the particles, i.e. K2.5<K10So that C2.5*K10>M2.5＝C2.5*K2.5The above-mentioned error is caused.
In the present embodiment, the amplification part C is subtracted2.5*K10Supplementing the actual part C2.5*K2.5And the measured dust mass concentration value is closer to the actual value.
In the method for measuring the dust mass concentration value, whether or not C is satisfied is judged1≥C2≥……≥CnBefore, still include:
judging whether C is satisfied1≤C2≤……≤Cn；
If yes, the calculation device is used to obtain the particle size value equal to phi1Mass concentration value M, M ═ C of the dustn*KnTherefore, the phenomenon of hanging upside down of the measurement result is avoided, and the measurement accuracy is further improved.
In the method for measuring a dust mass concentration value, when n is 3, it is determined whether or not C is satisfied1≥C2≥……≥CnBefore, still include:
judging whether C is satisfied1≤C2And C is2≥C3；
If yes, the calculation device is used to obtain the particle size value equal to phi1Mass concentration value M, M ═ C of the dust2*K2－C3*K2+C3*K3Therefore, partial hanging phenomenon of the measurement result is avoided, and the measurement accuracy is further improved.
In the method for measuring a dust mass concentration value, when n is 3, it is determined whether or not C is satisfied1≥C2≥……≥CnBefore, still include:
judging whether C is satisfied1≤C2And C is2≤C3；
If yes, the calculation device is used to obtain the particle size value equal to phi1Mass concentration value M, M ═ C of the dust3*K3Therefore, the phenomenon of hanging upside down of the measurement result is avoided, and the measurement accuracy is further improved.
In addition, in the method for measuring the dust mass concentration value, the dust detection device is a light scattering dust meter.
In addition, in the measuring equipment of the dust mass concentration value, the dust detection device is a light scattering dust meter.
In addition, in the measuring apparatus of the dust mass concentration value, the number of the dust detection devices is n, and each dust detection device is used for simultaneously acquiring the corresponding CnTo detect errors present in the detection using a single dust detection device.
In addition, in the measuring apparatus of the dust mass concentration value, the number of the dust detecting devices is one, and the dust detecting devices periodically acquire C1、C2、……、CnTo avoid errors in detection with multiple dust detection devices.
Drawings
FIG. 1 is a flow chart of a method of measuring a dust mass concentration value in a first embodiment of the present invention;
FIG. 2 is a flow chart of a method of measuring a dust mass concentration value in a second embodiment of the present invention;
FIG. 3 is a flow chart of a method of measuring a dust mass concentration value in a third embodiment of the present invention;
FIG. 4 is a flow chart of a method of measuring a dust mass concentration value in a fourth embodiment of the present invention;
FIG. 5 is a schematic configuration diagram of an apparatus for measuring a dust mass concentration value in a fifth embodiment of the present invention;
fig. 6 is a schematic configuration diagram of an apparatus for measuring a dust mass concentration value in a sixth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
A first embodiment of the present invention relates to a method for measuring a dust mass concentration value, as shown in fig. 1, including:
101. obtaining C with at least one dust detection device1、C2、……、CnN is a natural number of 2 or more, wherein CnIs a particle size value equal to phinCPM value of dust, and phi1＞Φ2＞……＞Φn(ii) a The dust detection device is a light scattering dust meter, and the principle of the light scattering dust meter is as follows: the laser light source irradiates on floating particles in fixed flow air, the particles can emit scattered light, the scattered light with different concentrations is converged by the reflector and received by the photodiode, the generated scattered light intensity is converted into an electric signal, and the concentration of floating dust can be tested by utilizing the principle that the intensity of the scattered light and the concentration of dust are in relative proportion;
102. obtaining with the above C1、C2、……、CnRespectively corresponding to K1、K2、……、KnWherein, K isnIs a particle size value equal to phinThe conversion coefficient of the mass concentration of the dust;
103. judging whether C is satisfied1≥C2≥……≥Cn；
104. If yes, the calculation device is used to obtain the particle size value equal to phi1Mass concentration value M, M ═ C of the dust1*K1－C2*K1+C2*K2－……－Cn*Kn-1+Cn*Kn。
As can be seen from the above, the method for measuring a dust mass concentration value according to the present embodiment can obtain a more accurate dust mass concentration value. For example, PM is measured in a prior art measurement10The formula of the mass concentration value is as follows: m10＝C10*K10Wherein M is10Is PM10Mass concentration value of, K10For measuring PM10Value of K in time, C10For measuring PM10CPM value of time;
similarly, in measuring PM2.5The formula of the mass concentration value is as follows: m2.5＝C2.5*K2.5Wherein M is2.5Is PM2.5Mass concentration value of, K2.5For measuring PM2.5Value of K in time, C2.5For measuring PM2.5CPM value of time;
the above formula can be understood by merging and decomposing:
M10＝C10*K10＝(C2.5+C2.5～10)*K10＝C2.5*K10+C2.5～10*K10，
the problem is that the PM is actually being measured10During the process, the particle size range of the particulate matters capable of entering a dust meter measuring chamber is 0-10 microns, wherein PM2.5Are also included therein. K2.5 must be smaller than K10 due to the particle size of the particles, i.e. K2.5<K10So that C2.5*K10>M2.5＝C2.5*K2.5The above-mentioned error is caused.
In the present embodiment, the amplification part C is subtracted2.5*K10Supplementing the actual part C2.5*K2.5And the measured dust mass concentration value is closer to the actual value.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the steps contain the same logical relationship, which is within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
Those skilled in the art can understand that all or part of the steps in the method of the foregoing embodiments may be implemented by a program to instruct related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, etc.) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
A second embodiment of the invention relates to a method for measuring a dust mass concentration value. The second embodiment is an improvement of the first embodiment, and the main improvements are as follows: in the method of measuring a dust mass concentration value according to the present embodiment, as shown in fig. 2, it is determined whether or not C is satisfied1≥C2≥……≥CnBefore, still include:
105. judging whether C is satisfied1≤C2≤……≤Cn，
106. If yes, the calculation device is used to obtain the particle size value equal to phi1Mass concentration value M, M ═ C of the dustn*KnTherefore, the phenomenon of hanging upside down of the measurement result is avoided, and the measurement accuracy is further improved.
For example, when n is 2, the particle size is found to be equal to Φ using a computing device1Before the mass concentration value M of the dust, the method further comprises:
judging whether C is satisfied1≤C2；
If so, M ═ C2*K2Therefore, the phenomenon that the measurement result is hung upside down, namely the concentration of the smaller particles is higher than that of the larger particles, is avoided, and the measurement accuracy is further improved.
Third embodiment of the present inventionThe mode relates to a method for measuring a dust mass concentration value. The third embodiment is an improvement of the first embodiment, and the main improvements are as follows: in the method of measuring a dust mass concentration value according to the present embodiment, as shown in fig. 3, when n is 3, it is determined whether or not C is satisfied1≥C2≥……≥CnBefore, still include:
107. judging whether C is satisfied1≤C2And C is2≥C3；
108. If yes, the calculation device is used to obtain the particle size value equal to phi1Mass concentration value M, M ═ C of the dust2*K2－C3*K2+C3*K3Therefore, partial hanging phenomenon of the measurement result is avoided, and the measurement accuracy is further improved.
A fourth embodiment of the present invention relates to a method of measuring a dust mass concentration value. The fourth embodiment is an improvement of the first embodiment, and the main improvements are as follows: as shown in fig. 4, when it is judged whether or not C is satisfied1≥C2≥……≥CnBefore, still include:
109. judging whether C is satisfied1≤C2And C is2≤C3；
110. If yes, the calculation device is used to obtain the particle size value equal to phi1Mass concentration value M, M ═ C of the dust3*K3Therefore, the phenomenon of hanging upside down of the measurement result is avoided, and the measurement accuracy is further improved.
A fifth embodiment of the present invention corresponds to the first embodiment, and relates to a measurement device for a dust mass concentration value, as shown in fig. 5, including:
at least one dust detection device 1 for obtaining C1、C2、……、CnN is a natural number of 2 or more, wherein CnIs a particle size value equal to phinCPM value of dust, and phi1＞Φ2＞……＞Φn(ii) a The dust detection device is a light scattering dust meter;
an obtaining module 2 for obtaining the C1、C2、……、CnRespectively corresponding to K1、K2、……、KnWherein, K isnIs a particle size value equal to phinThe conversion coefficient of the mass concentration of the dust;
a judging module 3 for judging whether C is satisfied1≥C2≥……≥Cn；
A calculation module 4 for obtaining a particle size value equal to phi1Mass concentration value M, M ═ C of the dust1*K1－C2*K1+C2*K2－……－Cn*Kn-1+Cn*Kn。
It should be noted that each module referred to in this embodiment is a logical module, and in practical applications, one logical unit may be one physical unit, may be a part of one physical unit, and may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.
It should be noted that, in the measuring apparatus of the dust mass concentration value, the number of the dust detection devices is n, and each dust detection device is used for simultaneously acquiring the corresponding Cn. If all dust detection devices are started simultaneously, the surrounding air can be measured simultaneously, and errors caused by different air are reduced.
A sixth embodiment of the present invention relates to a measuring apparatus of a dust mass concentration value. The sixth embodiment is substantially the same as the fifth embodiment, and mainly differs therefrom in that: in the fifth embodiment, the number of dust detection devices is n. In the sixth embodiment of the present invention, however, as shown in fig. 6, the number of the dust detection devices 1 is one, and the dust detection device periodically acquires C1、C2、……、Cn. In the present embodiment, the dust detection device has n detection units for detecting CnTest window, by controlling the solenoid valveThe test window is now periodically opened, e.g. by a solenoid valve to effect a first test C1One minute later, measure C2One minute … …, retest CnOne minute later, measure C1One minute, so on. Because the dust detection device has only one, compare with utilizing a plurality of dust detection devices, can avoid the detection error that exists among each dust detection device.
Of course, a person skilled in the art can also distinguish the working contents of a plurality of dust detection devices to achieve the technical effects achieved by the first embodiment in combination with the fifth embodiment and the sixth embodiment, and such a manner should also fall within the scope of the present invention.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (9)
1. A method for measuring a dust mass concentration value is characterized by comprising the following steps:
obtaining C with at least one dust detection device1、C2、……、CnN is a natural number of 2 or more, wherein CnIs a particle size value equal to phinCPM value of dust, and phi1＞Φ2＞……＞Φn；
Obtaining with said C1、C2、……、CnRespectively corresponding to K1、K2、……、KnWherein, K isnIs a particle size value equal to phinThe conversion coefficient of the mass concentration of the dust;
judging whether C is satisfied1≥C2≥……≥Cn；
If yes, the calculation device is used to obtain the particle size value equal to phi1Mass concentration value M, M ═ C of the dust1*K1－C2*K1+C2*K2－……－Cn*Kn-1+Cn*Kn。
2. The method of claim 1, wherein determining whether C is satisfied is performed1≥C2≥……≥CnBefore, still include:
judging whether C is satisfied1≤C2≤……≤Cn；
If yes, the calculation device is used to obtain the particle size value equal to phi1Mass concentration value M, M ═ C of the dustn*Kn。
3. The method of claim 1, wherein when n is 3, judging whether C is satisfied1≥C2≥……≥CnBefore, still include:
judging whether C is satisfied1≤C2And C is2≥C3；
If yes, the calculation device is used to obtain the particle size value equal to phi1Mass concentration value M, M ═ C of the dust2*K2－C3*K2+C3*K3。
4. The method of claim 1, wherein when n is 3, judging whether C is satisfied1≥C2≥……≥CnBefore, still include:
judging whether C is satisfied1≤C2And C is2≤C3；
If yes, the calculation device is used to obtain the particle size value equal to phi1Mass concentration value M, M ═ C of the dust3*K3。
5. The method of measuring a dust mass concentration value of claim 1, wherein the dust detection device is a light scattering dust meter.
6. A measuring device for dust mass concentration values is characterized by comprising:
at least one dust detection device for obtaining C1、C2、……、CnN is a natural number of 2 or more, wherein CnIs a particle size value equal to phinCPM value of dust, and phi1＞Φ2＞……＞Φn；
An acquisition module for acquiring the C1、C2、……、CnRespectively corresponding to K1、K2、……、KnWherein, K isnIs a particle size value equal to phinThe conversion coefficient of the mass concentration of the dust;
a judging module for judging whether C is satisfied1≥C2≥……≥Cn；
A calculation module for obtaining a particle size value equal to phi1Mass concentration value M, M ═ C of the dust1*K1－C2*K1+C2*K2－……－Cn*Kn-1+Cn*Kn。
7. The apparatus of claim 6, wherein the dust detection device is a light scattering dust meter.
8. The apparatus for measuring dust mass concentration value according to claim 6, wherein the number of dust detection devices is n, and each dust detection device is configured to simultaneously acquire a corresponding Cn。
9. The apparatus for measuring dust mass concentration value according to claim 6, wherein the number of the dust detection devices is one, and the dust detection devices periodically acquire C1、C2、……、Cn。
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| EP3819627B1 (en) * | 2018-09-05 | 2022-12-07 | Cubic Sensor and Instrument Co., Ltd. | Method and apparatus for simultaneously measuring mass concentrations of particulate matter with different particle sizes |
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