CN111965083A - Particulate matter calibration system - Google Patents
Particulate matter calibration system Download PDFInfo
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- CN111965083A CN111965083A CN202010985204.0A CN202010985204A CN111965083A CN 111965083 A CN111965083 A CN 111965083A CN 202010985204 A CN202010985204 A CN 202010985204A CN 111965083 A CN111965083 A CN 111965083A
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- 239000013618 particulate matter Substances 0.000 title abstract description 14
- 239000000443 aerosol Substances 0.000 claims abstract description 110
- 239000000428 dust Substances 0.000 claims abstract description 63
- 239000002245 particle Substances 0.000 claims abstract description 54
- 238000002156 mixing Methods 0.000 claims abstract description 33
- 230000005540 biological transmission Effects 0.000 claims abstract description 15
- 230000003068 static effect Effects 0.000 claims abstract description 11
- 230000005611 electricity Effects 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 4
- 239000002216 antistatic agent Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 12
- 238000005070 sampling Methods 0.000 description 10
- 238000001514 detection method Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000005427 atmospheric aerosol Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides a particulate matter calibration system, which comprises: the atomized aerosol generator generating an atomized aerosol having a predetermined concentration; a dust generator that generates dust particles of a predetermined size; a cutter through which the dust particles emitted from the dust generator pass; a static neutralizer capable of eliminating static electricity in the pipeline which may be generated by the dust particles passing through the cutter; an aerosol transport tube into which the atomized aerosol and dust particles enter; the aerosol transmission pipe is connected to the aerosol mixing cabin, the aerosol and the dust particles enter the aerosol mixing cabin, and the proportion relation between the atomized aerosol and the dust particles can be selected by adjusting the atomized aerosol generator and the dust generator, so that different particle concentration ranges can be obtained.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to a particulate matter calibration system which is used for calibrating dust, particulate matters or aerosol measuring instruments or used as a stable generating source for comparing dust and other particulate measuring instruments.
Background
Along with the improvement of people to environmental protection consciousness, in order to effectively reduce and restrain the influence of dust particles and the like discharged in industrial production on the life of people, the concentration of the particles in aerosol under various environments needs to be monitored, the adverse effect of high-concentration particles on people is avoided, and therefore the method has great practical significance in measuring and quantitatively limiting the concentration of the particles in the aerosol.
Most of the existing particulate matter calibration devices are focused on a dust (particulate) generating device, how to generate particulate matters is related to, and in order to solve the problem of calibration of a particulate matter concentration detection instrument, an aerosol particulate matter dispersion environment with stable specific concentration is needed, so that the particulate matter concentration detection instrument can test in a specific concentration range conveniently to obtain a reliable detection result. However, most of the existing particulate matter calibration systems are poor in stability, large in concentration fluctuation and beyond test requirements, inconvenient to operate and time-consuming and labor-consuming.
Therefore, a uniform and stable particle dispersion field with certain detection concentration requirement needs to be formed so as to realize the inspection and calibration of particle monitoring instruments with different concentration ranges.
Disclosure of Invention
The invention aims to provide a particulate matter concentration calibration system; the device is provided with a uniform and stable blending device on one hand, can form a particle field with a stable concentration value according to the amount of generated aerosol, and can calibrate and test a particle measuring instrument and compare the particle measuring instrument with a dust instrument in the uniform and stable particle field; on the other hand, the device is effectively suitable for a calibrated medium, and because the environment of the uniform particles with higher concentration is difficult to simulate, the dust area to be measured is simulated by selecting a proper generator to uniformly distribute the aerosol in the environment to manufacture standard concentration. The invention takes the self characteristics of the medium, the operability of sample preparation and other factors into consideration to select the proper medium, the invention can adopt various media to generate dust particles, and further preferably adopts A1 or A2 of ISO12103-1 to carry out calibration research.
The invention provides a particulate matter calibration system, which comprises: the atomized aerosol generator generating an atomized aerosol having a predetermined concentration; a dust generator that generates dust particles of a predetermined size; a cutter through which the dust particles emitted from the dust generator pass; a static neutralizer capable of eliminating static electricity in the pipeline which may be generated by the dust particles passing through the cutter; an aerosol transport tube into which the atomized aerosol and dust particles enter; the aerosol transmission pipe is connected to the aerosol mixing cabin, the aerosol and the dust particles enter the aerosol mixing cabin, and the proportion relation between the atomized aerosol and the dust particles can be selected by adjusting the atomized aerosol generator and the dust generator, so that different particle concentration ranges can be obtained.
The aerosol mixing cabin is provided with a top interface, and the aerosol transmission pipe is connected with the top interface.
Wherein, the aerosol mixing cabin is provided with a bottom interface.
The bottom interface is installed on the high-efficiency filter, and the rotating speed of the fan is controlled through the frequency converter, so that the flow in the pipeline is adjusted.
Wherein, the aerosol mixing cabin adopts transparent antistatic material to form.
The system of the invention can provide a stable and uniform particle field, and the test chamber forms a stable and uniform continuous particle source for the particle measuring instrument to carry out calibration and measurement operation. The system can quickly reach the concentration of the particles required by the test, and is short in test time and simple in operation.
The concentration ranges that can be achieved are as follows:
①20μg/m3～75μg/m3
②75μg/m3～250μg/m3
③250μg/m3～600μg/m3
④600μg/m3～2500μg/m3，
⑤2500μg/m3～6000μg/m3，
⑥6500μg/m3～10000μg/m3。
the system can achieve a stable aerosol state within the six concentration ranges by controlling the generator, and ensures the stability and uniformity of the test.
Drawings
Fig. 1 is a schematic structural diagram of a particulate calibration system of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
To facilitate an understanding of the present invention, embodiments of the present invention will be described below with reference to the accompanying drawings, and it will be understood by those skilled in the art that the following descriptions are provided only for the purpose of illustrating the present invention and are not intended to specifically limit the scope thereof.
Fig. 1 is a schematic structural diagram of a particulate calibration system according to the present invention. As shown in fig. 1, the calibration system includes the following components, but is not limited to the following components, and the corresponding components may be added or subtracted as needed:
aerosols are suspensions of liquid or solid particles in air. They can act as condensation nuclei for water droplets and ice crystals (see atmospheric condensation nuclei, atmospheric ice nuclei), absorbers and scatterers of solar radiation, and participate in various chemical cycles, and are an important component of the atmosphere. Fog, smoke, haze, light fog (mist), dust, smoke, and the like, which are all natural or artificial atmospheric aerosols, the present invention may preferably be simulated by using an atomized aerosol generator 1, the atomized aerosol generator 1 generating aerosols having a predetermined concentration, an output end of the atomized aerosol generator 1 being connected to an aerosol transport pipe 5 through a pipeline, an input end of the atomized aerosol generator 1 being connected to a first control solenoid valve.
The dust generator 2 is preferably A1 dust, the specific composition is in accordance with ISO12103 standard, the dust generator 2 generates dust particles with preset size, the input end of the dust generator 2 is connected with a second control electromagnetic valve, the first control electromagnetic valve and the second control electromagnetic valve are connected to a control circuit, the first control electromagnetic valve and the second control electromagnetic valve control the on-off of compressed air, the compressed air enters the input end of the aerosol generator 1 through the first control electromagnetic valve, and the compressed air enters the input end of the dust generator 2 through the second control electromagnetic valve.
And a cutter 3, wherein dust particles emitted from the output end of the dust generator 2 pass through the cutter 3, and the cutter 3 has a screening function of screening out large-particle dust in gas so that smaller dust particles pass through the cutter 3.
A static neutralizer 4, said static neutralizer 4 being capable of eliminating the static electricity in the piping that may be generated by the dust particles passing from the cutter 3.
The aerosol delivery pipe 5 comprises a plurality of main pipe sections, preferably a lower main pipe section, a middle main pipe section, an upper main pipe section and a top main pipe section. Preferably, the lower main pipe section, the middle main pipe section and the upper main pipe section are arranged in the vertical direction, and the top main pipe section is arranged in the horizontal direction; the aerosol transmission pipe 5 preferably has a first bending part, an extending part and a second bending part at the top main pipe section, and the second bending part is connected with the top interface of the aerosol mixing cabin 9. A dust collecting tank is arranged below the lower main pipe section of the aerosol conveying pipe 5, the dust collecting tank collects solid particles settled in the aerosol conveying pipe 5, an opening is arranged on the pipe wall of the lower main pipe section of the aerosol conveying pipe 5, which is close to the dust collecting tank, preferably, an air inlet is arranged on the opening, a filter is further arranged on the opening, and the air in the pipeline is ensured to be clean.
The atomized aerosol and dust particles enter the aerosol conveying pipe 5, specifically, a first interface and a second interface are arranged on a vertically arranged middle main pipe section of the aerosol conveying pipe 5, the first interface is connected with the electrostatic neutralizer 4, the second interface is connected with an output end of the atomized aerosol generator 1, and the atomized aerosol generator 1 enters the generated atomized aerosol into the aerosol conveying pipe 5 through the second interface. The static-free gas containing dust particles passing through the first interface enters the aerosol transmission pipe 5, larger dust particles can be deposited in the aerosol transmission pipe 5 and fall into the dust collecting tank at the bottom, the aerosol and the dust particles in the aerosol transmission pipe 5 ascend along the main pipe section in the vertical direction of the aerosol transmission pipe 5, and after passing through the horizontal top main pipe section, the gas enters the cabin from the top interface of the aerosol blending cabin 9 and is uniformly mixed in the cabin, and a stable balance state is achieved.
The aerosol mixing cabin 9 comprises an upper cabin body, a middle cabin body and a lower cabin body, wherein the upper cabin body, the middle cabin body and the lower cabin body are separable and are connected in an assembling way or are integrally formed; the upper cabin body is conical, the upper cabin body is provided with a top interface, and the top interface of the upper cabin body is connected with the second bending part of the aerosol transmission pipe 5; the lower part cabin body is the back taper, the lower part cabin body has the bottom interface, aerosol transmission pipe 5 is connected to aerosol mixing cabin 9, atomizing aerosol and dust particle enter into in the aerosol mixing cabin 9, can select the proportional relation between atomizing aerosol and the dust particle through adjusting atomizing aerosol generator 1 and dust generator 2 to obtain different particulate matter concentration ranges as follows:
①20μg/m3～75μg/m3
②75μg/m3～250μg/m3
③250μg/m3～600μg/m3
④600μg/m3～2500μg/m3，
⑤2500μg/m3～6000μg/m3，
⑥6500μg/m3～10000μg/m3。
The rear end of the pipeline of the aerosol mixing cabin 9 is a flow monitoring pipeline and comprises a fan 6, a flowmeter 7 and a high-efficiency filter 8, wherein the fan 6 provides power, the flowmeter 7 monitors the flow and stabilizes the flow, the fan 6 controls the rotating speed of the frequency control fan 6 through a frequency converter to realize the adjustment of the flows with different sizes. Specifically, the bottom interface of the aerosol mixing cabin 9 is installed on the high efficiency filter 8, and the rotating speed of the fan 6 is controlled through the frequency converter, so that the regulation of the flow in the pipeline is realized. The efficient filter 8 arranged on the bottom of the aerosol mixing cabin 9 through a pipeline can enable aerosol in the testing process to be absorbed through the filter, and prevent the aerosol from entering a rear pipeline to pollute a flowmeter or being discharged into indoor air.
The system adopts the aluminum profile to support the cabin body of the aerosol mixing cabin and fix and install the aerosol transmission pipe and the pipeline, and part of the pipeline structure and the connecting parts can also adopt the aluminum profile.
According to the invention, the aerosol generator generates a stable aerosol environment with a specified concentration in the aerosol blending cabin, the cutter screens out large-particle dust, the static neutralizer eliminates static electricity possibly generated in a pipeline by the dust, and the dust collection tank collects solid particles settled in the aerosol blending cabin.
The pipeline of the invention preferably adopts a sanitary stainless steel pipe pipeline, the pipeline can be in various forms, and the interface in the pipeline can be directly connected or connected through a three-way pipe.
When the particulate calibration system works, aerosol emitted by an atomizing aerosol generator 1 enters a middle main pipe section which is vertically arranged in an aerosol transmission pipe 5, aerosol emitted by a dust generator 2 enters the middle main pipe section after passing through a cutter 3 and an electrostatic neutralizer 4, large-particle aerosol falls into a dust collecting tank of the aerosol transmission pipe 5, small-particle aerosol enters a blending cabin 9 along with pipeline airflow, the aerosol reaches a stable state in a certain concentration range in the blending cabin, a sampling hole 10 is reserved in the blending cabin wall and provided with a connector, a stainless steel sampling pipe enters the cabin through a Glan head, a concentration meter samples through a stainless steel pipe, different concentration meters detect concentration values through sampling comparison, and the difference value between a standard concentration meter and a concentration meter to be detected is compared.
The whole pipeline is in a negative pressure state, the fan 6 provides air exhaust air quantity with certain flow, the flow meter 7 monitors and feeds back in real time and adjusts the air exhaust air quantity with PC feedback to realize air quantity testing, and the high-efficiency filter 8 is arranged in front of the flow meter to prevent aerosol from polluting the flow meter and influencing the precision of the flow meter.
According to the invention, relevant parameters of the generator or appropriate solution concentration are set according to requirements, and the environmental concentration required by the test can be obtained by controlling the atomization aerosol generator and the dust generator and stabilizing the system flow. The invention provides a method for rapidly realizing an environment needing to test the concentration of aerosol, which can realize the test requirements of stable aerosol with different concentration ranges, wherein the concentration of particulate matters in a system mixing bin is uniform and stable; the generation concentration of the particulate matters is adjustable; can adjust, supply stable even particulate matter source in real time as required, satisfy the requirement that the particulate matter measuring apparatu collected the flow.
It is to be understood that while the present invention has been described in conjunction with the preferred embodiments thereof, it is not intended to limit the invention to those embodiments. It will be apparent to those skilled in the art from this disclosure that many changes and modifications can be made, or equivalents modified, in the embodiments of the invention without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (5)
1. A particulate calibration system, comprising: the atomized aerosol generator generating an atomized aerosol having a predetermined concentration; a dust generator that generates dust particles of a predetermined size; a cutter through which the dust particles emitted from the dust generator pass; a static neutralizer capable of eliminating static electricity in the pipeline which may be generated by the dust particles passing through the cutter; an aerosol transport tube into which the atomized aerosol and dust particles enter; the method is characterized in that: the aerosol transmission pipe is connected to the aerosol mixing cabin, the aerosol and the dust particles enter the aerosol mixing cabin, and the proportion relation between the atomized aerosol and the dust particles can be selected by adjusting the atomized aerosol generator and the dust generator, so that different particle concentration ranges can be obtained.
2. The particulate calibration system of claim 1, wherein: the aerosol mixing cabin is provided with a top interface, and the aerosol transmission pipe is connected with the top interface.
3. The particulate calibration system of claim 1, wherein: the aerosol mixing cabin is provided with a bottom connector.
4. The particulate calibration system of claim 3, wherein: the bottom interface is installed to high efficiency filter, through the rotational speed of converter control fan, realizes the regulation of flow in the pipeline.
5. The particulate calibration system of claim 1, wherein: the aerosol mixing cabin is made of transparent antistatic materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010985204.0A CN111965083A (en) | 2020-09-17 | 2020-09-17 | Particulate matter calibration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010985204.0A CN111965083A (en) | 2020-09-17 | 2020-09-17 | Particulate matter calibration system |
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| CN111965083A true CN111965083A (en) | 2020-11-20 |
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| CN202010985204.0A Pending CN111965083A (en) | 2020-09-17 | 2020-09-17 | Particulate matter calibration system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113654963A (en) * | 2021-09-23 | 2021-11-16 | 中国科学技术大学 | Falling type aerosol concentration sensor calibration test device and method |
| CN115015057A (en) * | 2022-05-30 | 2022-09-06 | 安徽理工大学 | Aerosol dust particle size and concentration oriented spontaneous generation calibration and detection system |
| WO2023044643A1 (en) * | 2021-09-23 | 2023-03-30 | 中国科学技术大学 | Falling-type aerosol concentration sensor calibration test apparatus and method |
| CN115970599A (en) * | 2022-12-13 | 2023-04-18 | 中国矿业大学 | High-precision belt type dust generator and calibration method thereof |
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