CN113514379A - Particulate matter detection method based on dual-channel technology - Google Patents
Particulate matter detection method based on dual-channel technology Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 78
- 239000013618 particulate matter Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 35
- 239000002245 particle Substances 0.000 claims abstract description 28
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 230000005250 beta ray Effects 0.000 claims description 10
- 239000000428 dust Substances 0.000 claims description 3
- 230000005684 electric field Effects 0.000 claims description 3
- 238000000149 argon plasma sintering Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000012937 correction Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 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
- G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
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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
- G01N2015/0662—Comparing before/after passage through filter
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Abstract
The invention provides a particulate matter detection method based on a dual-channel technology, which comprises the following steps: the gas to be detected respectively enters a first detection channel and a second detection channel, and a capacitance value C corresponding to the gas to be detected is obtained in the first detection channel by using a capacitance method11In the second detection channel, removing the particulate matters in the gas to be detected, and then obtaining the capacitance value C corresponding to the gas to be detected with the particulate matters removed by using a capacitance method22(ii) a Using capacitance value C11And C22Obtaining the capacitance variation Q ═ C corresponding to the particles in the gas to be measured11‑C22(ii) a And obtaining the concentration C of the particulate matters in the gas to be detected, which is equal to K.Q, by using the capacitance variation Q and the stored coefficient K. The invention has the advantages of small measurement error, strong anti-interference capability and the like.
Description
Technical Field
The invention relates to particle detection, in particular to a particle detection method based on a dual-channel technology.
Background
The existing instrument which adopts the combination of the light scattering method and the beta ray method strives to combine the advantage of rapid measurement of light scattering with the advantage of high accuracy of the beta ray. However, there are also many problems in application:
the concentration of atmospheric environment particles is low, a scattering signal of light scattering on one point is weak, and if the amplification factor of the signal is too small on a circuit, the detection limit is too high, otherwise, the detection limit is easily influenced by noise and external interference.
The light scattering method needs devices such as a light source, a lens, a photoelectric detector and the like, wherein the use temperature of electronic devices is basically below 80 ℃, and optical devices are prevented from being polluted in the use process, so that the light scattering method is difficult to be applied to the measurement of high-temperature and high-concentration and even corrosive smoke particles emitted by pollution sources such as industrial boilers, power plant boilers and the like.
There are also academic cases where the particulate matter is measured using the capacitance method. Through research, the fact that the particulate matter concentration is measured by using the method under ideal conditions is basically learned, and the main problems are that:
1. the selected particulate matter is single in substance; the method only obtains the relation between the concentration of the specific substance and the capacitance value, and cannot be used in a gas environment with a plurality of mixed substances.
2. The particle size distribution of the selected particles is single; the particle size distribution of the particles in nature is varied, and the relationship between the concentration of the particles with single particle size distribution and the capacitance value is very limited.
3. The influence on this relationship when environmental conditions (temperature and humidity) change is not considered; this method cannot be applied to actual particulate matter concentration measurement.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a particulate matter detection method based on a dual-channel technology.
The purpose of the invention is realized by the following technical scheme:
the particulate matter detection method based on the dual-channel technology comprises the following steps:
the gas to be detected respectively enters a first detection channel and a second detection channel, and a capacitance value C corresponding to the gas to be detected is obtained in the first detection channel by using a capacitance method11In the second detection channel, removing the particulate matters in the gas to be detected, and then obtaining the capacitance value C corresponding to the gas to be detected with the particulate matters removed by using a capacitance method22；
Using capacitance value C11And C22Obtaining the capacitance variation Q ═ C corresponding to the particles in the gas to be measured11-C22；
And obtaining the concentration C of the particulate matters in the gas to be detected, which is equal to K.Q, by using the capacitance variation Q and the stored coefficient K.
Compared with the prior art, the invention has the beneficial effects that:
1. the detection limit is low, and the anti-interference capability is strong;
compared with a signal of a light beam scattering point measured by light scattering, when the method is used for detecting under the same particle concentration, the original signal (capacitance value) is larger, the detection limit can be reduced, and the anti-interference capability is enhanced;
2. the application is wide;
the light scattering method is difficult to be applied to the measurement of smoke particles with high temperature, high concentration and even corrosivity, the invention adopts a dual-channel technology, the capacitance plate is not influenced by factors such as high temperature, high corrosivity and the like, the adaptability is strong, and the cleaning and the maintenance are easy;
compared with the capacitance method described in academia, the invention can obtain the relation between the concentration of the particulate matter mixed by various substances and the particulate matter with various particle size distributions and the output signal, and has strong universality and small limitation;
3. the error is small;
the capacitance method described in academia does not consider the influence of environment (temperature, humidity and the like), and the invention adopts a double-channel reference mode to avoid the influence of environment change on measurement;
the method has the function of updating the beta-ray correction coefficient, continuously and automatically updates the coefficient K, adapts to different monitoring environments, makes up the limitation of the capacitance method, and improves the accuracy of the capacitance method in rapid measurement.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention. In the figure:
FIG. 1 is a flow chart of a particulate matter detection method based on a dual channel technique according to an embodiment of the invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. Some conventional aspects have been simplified or omitted for the purpose of explaining the technical solution of the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
fig. 1 is a schematic structural diagram of a particulate matter detection method based on a dual-channel technology according to an embodiment of the present invention, and as shown in fig. 1, the particulate matter detection method based on the dual-channel technology includes:
the gas to be detected respectively enters a first detection channel and a second detection channel, and a capacitance value C corresponding to the gas to be detected is obtained in the first detection channel by using a capacitance method11In the second detection channel, removing the particulate matters in the gas to be detected, and then obtaining the capacitance value C corresponding to the gas to be detected with the particulate matters removed by using a capacitance method22；
Using capacitance value C11And C22Obtaining the capacitance variation Q ═ C corresponding to the particles in the gas to be measured11-C22；
And obtaining the concentration C of the particulate matters in the gas to be detected, which is equal to K.Q, by using the capacitance variation Q and the stored coefficient K.
In order to update the correction coefficient to improve the detection accuracy, the gas to be detected which is discharged from the first measurement channel is collected by the filter paper, the filter paper which collects the particulate matters is transferred to a detection position, the particulate matters collected on the filter paper are detected by using a beta-ray detection technology, and thus the concentration C of the particulate matters in the gas to be detected is obtainedβ；
Replacing the stored coefficient K with a coefficient
In order to eliminate the influence of the environment on the detection, further, the gas without containing particulate matter enters the first detection channel and the second detection channel respectively, and the capacitance value C is obtained in the first detection channel by using a capacitance method1In the second detection channel, capacitance C is obtained by capacitance method2；
Capacitance value Q is replaced by Q ═ C11+C2-(C22+C1)。
In order to obtain accurate capacitance value, further, in the first detection channel and the second detection channel, respectively setting a capacitance sensor, and obtaining capacitance value CMAnd the output signal V of the capacitive sensor is:
To facilitate removal of the filter paper for detection of the particulate matter collected on the filter paper using beta-ray detection techniques, further, the filter paper is wrapped around a first wheel at one end and a second wheel at the other end, the first or second wheel being a capstan.
In order to improve the effect of removing the particulate matters in the gas, further, an electric field dust removal technology is used for removing the particulate matters in the gas.
Example 2:
an application example of the particulate matter detection method based on the dual-channel technology according to embodiment 1 of the present invention is described.
In this application example, as shown in fig. 1, one end of the filter paper is wound around the driving wheel, and the other end is wound around the driven wheel, and the filter paper is wound by the rotation of the driving wheel, so as to move the collected particulate matter on the filter paper, so as to detect the particulate matter collected on the filter paper by using the β -ray detection technology; the method is characterized in that filter paper is used for collecting the particulate matters in the gas to be detected which is discharged out of the first detection channel, and the method is used for obtaining the content of the particulate matters by using a beta-ray detection technology;
the first detection channel and the second detection channel both use capacitance sensors, and the obtained capacitance value CMAnd the output signal V of the capacitive sensor is:
l is the inductance of the sensor resonator, f0For sensor resonator reference frequency, C0Is an initial value; in the second detection channel, removing particulate matters in the gas by using an electric field dust removal technology;
the particulate matter detection method based on the dual-channel technology of the embodiment of the invention specifically comprises the following steps:
gas without particles respectively enters a first detection channel and a second detection channel, and a capacitance value C is obtained in the first detection channel by using a capacitance method1In the second detection channel, capacitance C is obtained by capacitance method2；
The gas to be detected respectively enters a first detection channel and a second detection channel, and a capacitance value C corresponding to the gas to be detected is obtained in the first detection channel by using a capacitance method11In the second detection channel, removing the particles in the gas to be detected, and then obtaining and removing the particles by using a capacitance methodCapacitance C corresponding to gas to be measured22；
Obtaining the capacitance variation Q ═ C corresponding to the particles in the gas to be measured by using the capacitance value11+C2-(C22+C1)；
Obtaining the concentration C of the particulate matters in the gas to be detected as K.Q by using the capacitance variation Q and the stored coefficient K;
collecting the gas to be detected discharged from the first measuring channel by filter paper, transferring the filter paper after collecting the particles to a detection position, and detecting the particles collected on the filter paper by using a beta ray detection technology so as to obtain the concentration C of the particles in the gas to be detectedβ；
Replacing the stored coefficient K with a coefficient
Therefore, the invention not only utilizes the double-channel detection technology to eliminate the influence of the environment, but also reduces the detection limit by using the capacitive sensor and improves the anti-interference capability; and the beta ray detection technology is used for correcting the coefficient, so that the coefficient is continuously updated, and the detection accuracy is improved.
Claims (6)
1. The particulate matter detection method based on the dual-channel technology is characterized by comprising the following steps of:
the gas to be detected respectively enters a first detection channel and a second detection channel, and a capacitance value C corresponding to the gas to be detected is obtained in the first detection channel by using a capacitance method11In the second detection channel, removing the particulate matters in the gas to be detected, and then obtaining the capacitance value C corresponding to the gas to be detected with the particulate matters removed by using a capacitance method22；
Using capacitance value C11And C22Obtaining the capacitance variation Q ═ C corresponding to the particles in the gas to be measured11-C22；
And obtaining the concentration C of the particulate matters in the gas to be detected, which is equal to K.Q, by using the capacitance variation Q and the stored coefficient K.
2. The particulate matter detection method based on the dual-channel technology as claimed in claim 1, wherein the gas to be detected which is discharged from the first measurement channel is collected by filter paper, the filter paper after collecting the particulate matter is transferred to a detection position, and the particulate matter collected on the filter paper is detected by using the beta-ray detection technology, so that the concentration C of the particulate matter in the gas to be detected is obtainedβ；
Replacing the stored coefficient K with a coefficient
3. The particle detection method based on the dual-channel technology as claimed in claim 1, wherein the gas without particle enters the first detection channel and the second detection channel respectively, and the capacitance value C is obtained in the first detection channel by using a capacitance method1In the second detection channel, capacitance C is obtained by capacitance method2；
Capacitance value Q is replaced by Q ═ C11+C2-(C22+C1)。
4. The particle detection method based on the dual-channel technology as claimed in claim 1, wherein capacitance sensors are respectively arranged in the first detection channel and the second detection channel, and the capacitance value C is obtainedMAnd the output signal V of the capacitive sensor is:
5. The dual-channel technique-based particle detection method as claimed in claim 4, wherein one end of the filter paper is wound on a first wheel, and the other end is wound on a second wheel, and the first wheel or the second wheel is a driving wheel.
6. The particulate matter detection method based on the dual-channel technology as claimed in claim 2, wherein the particulate matter in the gas is removed by using an electric field dust removal technology.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114577543A (en) * | 2022-02-18 | 2022-06-03 | 中国环境科学研究院 | System and method for detecting emission amount of particulate matters in tail gas |
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Patent Citations (6)
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| TW201107744A (en) * | 2009-08-28 | 2011-03-01 | Radiant Innovation Inc | Measurement apparatus for gas concentration and method of the same |
| CN104280323A (en) * | 2013-07-02 | 2015-01-14 | 顾林鹏 | Novel cooking fume concentration real-time detection method |
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