CN117147397A - PM10 and PM2.5 simultaneous detection device with black carbon detection part - Google Patents
PM10 and PM2.5 simultaneous detection device with black carbon detection part Download PDFInfo
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- CN117147397A CN117147397A CN202311128867.0A CN202311128867A CN117147397A CN 117147397 A CN117147397 A CN 117147397A CN 202311128867 A CN202311128867 A CN 202311128867A CN 117147397 A CN117147397 A CN 117147397A
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- 238000001514 detection method Methods 0.000 title claims abstract description 133
- 239000003738 black carbon Substances 0.000 title claims abstract description 69
- 239000002245 particle Substances 0.000 claims abstract description 46
- 239000000428 dust Substances 0.000 claims abstract description 45
- 238000000926 separation method Methods 0.000 claims abstract description 35
- 230000005250 beta ray Effects 0.000 claims description 90
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000005286 illumination Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 6
- 238000004093 laser heating Methods 0.000 claims description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 22
- 229910002092 carbon dioxide Inorganic materials 0.000 description 11
- 239000001569 carbon dioxide Substances 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000001448 refractive index detection Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000001745 non-dispersive infrared spectroscopy Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000004804 winding 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
- G01N15/02—Investigating particle size or size distribution
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
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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
- G01N2015/0096—Investigating consistence of powders, dustability, dustiness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/10—Different kinds of radiation or particles
- G01N2223/102—Different kinds of radiation or particles beta or electrons
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- Engineering & Computer Science (AREA)
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Abstract
The application discloses a PM10 and PM2.5 simultaneous detection device with a black carbon detection part, which comprises: a PM10 particle sorting and air inflow device with an air inlet vertically arranged so that sample air to be detected can flow in; a continuous black carbon detection unit provided in an internal space of the PM10 particle sorting and air flow device; and an air flow path separation unit that separates particles of 10um or less, which are separated by the PM10 particle separation unit and the air flow unit, into two flow paths, detects particles of 10um or less, and separately re-sorts particles of 2.5um or less, to detect PM2.5. The application can utilize one air inlet to simultaneously and continuously detect PM10 and PM2.5 dust, and can form integral air flow by using one pump, thereby lightening the integral system.
Description
Technical Field
The application relates to a device for detecting tiny dust by a beta ray mode. More specifically, the present application relates to a detection device having a black carbon detection unit in addition to a beta-ray detection device of a PM10 and PM2.5 simultaneous detection system.
Background
As the prior art prior to the present application, a continuous beta-ray dust detection device is disclosed. This prior art discloses the following, namely, comprising: a fine dust separation part 200 for separating fine dust, sucking air from the outside atmosphere, and separating fine particles contained in the air for detecting a fine dust concentration; a detection air inflow unit 210 for guiding the dust and air separated from the dust separation unit as a detection object to the beta-ray detection unit; a roll filter 400 for filtering the fine dust flowing through the detection air inflow part; a beta-ray generating unit 300 connected to the lower end of the roll filter paper and configured to suck the air, and configured to detect dust filtered on the roll filter paper by emitting beta-rays; and a beta-ray detecting unit 310 for detecting beta-rays generated by the beta-ray generating unit 300, which are reduced by passing beta-rays through the dust filtered on the roll filter paper.
As another prior art, a dust detection device using β rays and a detection method using the detection device are disclosed. This prior art discloses that, in a dust detection device using β rays, air flowing in through an air inflow portion 110 flows through a straight tube type air inflow tube 125, and flows through a roll filter paper through an air passage formed in a diagonal direction on a side surface of a detection main body having a β ray generation portion 200 and a β ray detector 300, whereby the dust is filtered on the roll filter paper, the β rays generated in the β ray generation portion permeate filter paper through which the dust is filtered, and as the amount of the dust increases, the intensity of a β ray signal transmitted through the filter paper becomes smaller, whereby the amount of dust is detected by a change in the magnitude of the β ray signal detected by the β ray detector, wherein, in order to collect the β rays (-) generated by the β ray generation portion with the force of an electric field, a cylindrical cathode tube is provided from the side surface of the β ray generation portion toward the front side, an Anode mesh (Anode mesh) is further provided in front of the β ray detector, so that the β rays (-) generated by the β ray generation portion are dispersed to the cathode tube in front of the cathode tube based on the repulsive force of the cathode tube, and then the cathode ray is dispersed to the cathode tube in front of the cathode tube based on the repulsive force of the detector.
As still another prior art, a technology relating to a black carbon detecting device is disclosed. The conventional black carbon detecting device detects the concentration in the air or the atmosphere by using a single light (880 nm), but does not remove the influence of moisture in the air. That is, although there is an example in which a moisture filter is used in the air in the pretreatment process, there is a possibility that black carbon is also filtered in the process of filtering moisture, and thus the conventional technology aims to remove the influence of moisture without using a moisture filter in the pretreatment process. For this purpose, the black carbon detecting device of the related art includes: the main light source is positioned at the upper end of the device; a light diffusion part for transmitting the light of the main light source to the first, second, third and fourth chambers located at the lower end; an external air flow inlet through which external air flows in; an outside air discharge port for discharging the air flowed in; a filter for filtering black carbon in the air flowing in from the outer air flow inlet; a first chamber and a second chamber, wherein air flowing through the filter is circulated and discharged; the first, second, third and fourth sensing sensors pass through the first to fourth chambers to detect the intensity of the passed light at the lower end.
[ Prior Art literature ]
[ patent literature ]
(Korean patent document 1) publication No. 10-2022-0026062
(Korean patent document 2) authorized patent publication No. 10-2376031
(Korean patent document 3) authorized patent publication No. 10-1960226
Disclosure of Invention
Technical problem to be solved
The conventional beta-ray detector has two air inflow ports for simultaneously detecting PM10 and PM2.5, and has a problem in that the device is complicated and heavy since the detection is performed by providing separate beta-ray detection systems. Also, the particle separators of 10um and 2.5um respectively require air sucked in 16.7Liter/min to detect PM10 and PM2.5 respectively, and thus there is a problem in that two separate pumps are required.
The present application aims to provide an improved application in which a PM10 filter requiring 16.7Liter/min airflow is employed for PM10, and a splitter requiring 5Liter/min airflow is used for PM2.5 to branch off one air inflow path, whereby PM10 and PM2.5 can be detected by using one pump.
In the present application, when detecting black carbon, light is irradiated to black carbon by laser light, the black carbon absorbs the light to generate heat, and the light is refracted after the air is heated, so that the black carbon is detected by utilizing the phenomenon. The black carbon is composed of EC (Element Carbon) and OC (Organic Carbon), and the difference between them is that EC is black, and is generated by incomplete combustion of fossil fuel, and OC is a light color that is not black by binding carbon existing in the form of organic matter. The object of the present application is to detect EC in black. Additional detection means are required for OC detection, and when the present application is further provided with OC detection means, all Carbon (Total Carbon) can be detected. The OC detecting apparatus additionally provided in the present application may include: an OC collecting part for collecting the gaseous OC which is obtained by heating the filter paper to 40-50 ℃ to evaporate the OC in order to separate the OC contained in the fine dust filtered by the filter paper; an OC oxidation reaction part for detecting the amount of carbon dioxide contained in the collected gaseous OC, the pre-reaction carbon dioxide detection part detecting the amount of carbon dioxide before the reaction, heating the collected gaseous OC to 680 ℃ under an oxygen supply environment to convert into carbon dioxide; a post-reaction carbon dioxide detection unit that detects the amount of carbon dioxide after all the OCs are oxidized by the OC oxidation unit and converted into carbon dioxide; and a detection unit that compares the amount of carbon dioxide before the reaction with the amount of carbon dioxide after the reaction to detect OC. Here, the carbon dioxide may be accurately detected using an NDIR carbon dioxide detector.
Technical proposal
In order to solve the above problems, a continuous dual beta-ray type PM10 and PM2.5 simultaneous detection apparatus having a black carbon detection unit according to the present application includes:
a PM10 particle sorting and air inflow device with an air inlet vertically arranged so that sample air to be detected can flow in;
a continuous black carbon detection unit provided in an internal space of the PM10 particle sorting and air flow device; and
an air flow path separation unit that separates particles of 10um or less, which are separated by the PM10 particle separation unit and the air flow unit, into two flow paths, detects particles of 10um or less, and separately re-separates particles of 2.5um or less, and detects PM2.5;
wherein one side of the air flow path separating part is connected with the PM10 beta ray detecting part,
the other side of the air flow path separating part is connected with a PM2.5 beta ray detecting part through a PM2.5 separating part,
a PM10 Beta ray source and a PM2.5 Beta ray source (Beta-ray source) are arranged below the PM10 Beta ray detection part and the PM2.5 Beta ray detection part respectively,
PM10 flow control valves and PM2.5 flow control valves are arranged in the side surfaces of the PM10 beta ray source and the PM2.5 beta ray source,
a filter paper which is curled on the side and can move is arranged between the PM10 beta ray detection part and the PM2.5 beta ray detection part and between the PM10 beta ray source and the PM2.5 beta ray source,
between the PM10 beta ray detection unit and the PM2.5 beta ray detection unit and the PM10 beta ray source and the PM2.5 beta ray source, a pressing unit is provided for pressing the filter paper so that air cannot flow on the side surface of the filter paper.
Further, according to the continuous PM10 and PM2.5 simultaneous detection apparatus of the double β -ray system having a black carbon detection unit of the present application, an air inflow pump is connected to the rear ends of the PM10 flow control valve and the PM2.5 flow control valve, and the air inflow pump, the PM10 flow control valve, and the PM2.5 flow control valve are driven so that air flows into 16.7 litters per minute through the PM10 particle sorting and air flow device having the air inlet, flows into 11.5 litters per minute through the PM10 β -ray detection unit, and flows into 5 litters per minute through the PM2.5 β -ray detection unit.
Further, according to the continuous PM10 and PM2.5 simultaneous detection apparatus of the double β -ray system having a black carbon detection unit of the present application, the ratio of the area of the PM10 β -ray detection unit side flow path to the area of the PM2.5 β -ray detection unit side flow path of the air flow path separation unit is 11.5 to 5.
Further, according to the continuous type PM10 and PM2.5 simultaneous detection apparatus of the double β -ray type having a black carbon detection portion of the present application, the flow rates per minute of the PM10 flow rate control valve and the PM2.5 flow rate control valve are 11.5Liter and 5Liter, respectively.
Further, according to the continuous type PM10 and PM2.5 simultaneous detection apparatus of the double β -ray type having the black carbon detection portion of the present application, the PM2.5 separation portion separates the dust cleaning cover at set intervals, thereby cleaning dust accumulated inside.
Further, according to the double- β -ray type continuous PM10 and PM2.5 simultaneous detection apparatus having a black carbon detection portion of the present application, the dust cleaning cover is provided with an observation window for checking dust, so that dust accumulated on the PM2.5 separation portion is checked in operation.
Further, according to the continuous dual beta-ray type PM10 and PM2.5 simultaneous detection apparatus having a black carbon detection portion of the present application, a dust detection sensor and detection illumination are provided on the dust cleaning cover for confirming the amount of dust accumulated on the PM2.5 separation portion, remotely or without a separation device.
Further, a continuous type PM10 and PM2.5 simultaneous detection apparatus of the double β -ray system having a black carbon detection unit according to the present application includes:
a PM10 particle sorting and air inflow device with an air inlet vertically arranged so that sample air to be detected can flow in;
a continuous black carbon detection unit provided in an internal space of the PM10 particle separator and air flow device, the black carbon detection unit including a black carbon detection laser light source and a refractive index detection unit, the black carbon detection laser light source being located in a black carbon detection region, the refractive index detection unit being configured to detect refraction of light generated by converting light absorbed by black carbon into heat and heating air around the black carbon, in order to detect black carbon by utilizing a principle that the black carbon contained in sample air absorbs light to generate heat; and
an air flow path separation unit that separates particles of 10um or less, which are separated by the PM10 particle separation unit and the air flow unit, into two flow paths, detects particles of 10um or less, and separately re-separates particles of 2.5um or less, and detects PM2.5;
wherein one side of the air flow path separating part is connected with the PM10 beta ray detecting part,
the other side of the air flow path separating part is connected with a PM2.5 beta ray detecting part through a PM2.5 separating part,
a PM10 Beta ray source and a PM2.5 Beta ray source (Beta-ray source) are arranged below the PM10 Beta ray detection part and the PM2.5 Beta ray detection part respectively,
PM10 flow control valves and PM2.5 flow control valves are arranged in the side surfaces of the PM10 beta ray source and the PM2.5 beta ray source,
a filter paper which is curled on the side and can move is arranged between the PM10 beta ray detection part and the PM2.5 beta ray detection part and between the PM10 beta ray source and the PM2.5 beta ray source,
between the PM10 beta ray detection unit and the PM2.5 beta ray detection unit and the PM10 beta ray source and the PM2.5 beta ray source, a pressing unit is provided for pressing the filter paper so that air cannot flow on the side surface of the filter paper.
Further, according to the continuous type PM10 and PM2.5 simultaneous detection apparatus of the double β -ray type having the black carbon detection section according to the present application, the refractive index detection section uses a phenomenon that the refractive index changes according to the density of air when light passes through the air of different densities, the refractive index detection section includes a laser light source for refractive index detection and a linear array CCD (charge coupled device), and the linear array CCD is provided vertically for detecting a position where the refractive index changes according to the density of air.
Advantageous effects
According to the application as described above, PM10 and PM2.5 dust can be continuously detected simultaneously with one air inlet.
In addition, since the present application uses the PM10 particle sorting and air flowing device (which sorts only particles smaller than a set size and transfers them to the detection portion) having different flow rates, the entire air flow can be formed by using one pump, and the entire system can be made lighter.
The present application also provides a technique capable of simultaneously detecting black carbon generated by incomplete combustion of carbon, and thus provides a means capable of effectively managing air quality.
Drawings
Fig. 1 shows a continuous type PM10 and PM2.5 simultaneous detection apparatus of the double-beta-ray system having a black carbon detection unit according to the present application.
FIG. 2 shows an air channel separator according to the present application.
Fig. 3 shows a structure of a conventional air flow path separation unit.
FIG. 4 shows an improved air flow path separator of the present application.
Fig. 5 is a cross-sectional view of the PM2.5 detecting section according to the present application.
FIG. 6 is a cross-sectional view of the PM2.5 detection section of the present application with an observation window.
Fig. 7 is a cross-sectional view of the PM2.5 detection section of the present application when the dust detection sensor and the detection illumination are provided.
Fig. 8 shows a black carbon detecting portion provided in the air inflow portion of the present application.
Fig. 9 shows the black carbon detection principle (when the amount of black carbon is small) of the present application.
Fig. 10 shows the black carbon detection principle (when the amount of black carbon is large) of the present application.
[ reference numerals description ]
10: PM10 particle sorting and air inflow device
15: black carbon detection unit 20: air flow path separating part
30: PM2.5 separation section 31: PM2.5 air Inlet
32: PM2.5 air outlet 33A: dust cleaning cover
33B: viewing window 33C: dust detection sensor
33D: detection illumination 34: discharge pipe below PM2.4
35: PM2.5 cyclone 40A: PM10 beta ray detection unit
40B: PM2.5 β ray detection unit 50: beta ray source
60: PM10 flow control valve 70: PM2.5 flow control valve
80: filter paper 90: filter paper winding part
100: correction film
200: continuous double beta-ray PM10 and PM2.5 simultaneous detection device having black carbon detection unit
(a) In the conventional air flow path separating section, P1 and V1 are reached when the diameter is D1, and P2 and V2 are reached when the diameter is D2
(b) In the improved air flow path separating part, P1 'and V1' are reached when the diameter is D1', and P2' and V2 'are reached when the diameter is D2'
Detailed Description
Hereinafter, the operation and effects of the present application as described above will be described with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a continuous two-beta-ray type PM10 and PM2.5 simultaneous detection apparatus having a black carbon detection unit according to the present application.
When sample air to be detected flows in through the PM10 particle sorting and air flowing device, only particles below 10um flow into the detection flow path in the PM10 particle sorting and air flowing device. The PM10 particle sorting and air flow device used in the present application is a device that can sort particles of 10um or less when a flow rate of 16.7Liter per minute passes therethrough, and operates according to negative pressure (vacuum pressure) generated by an air inflow pump provided at the opposite side ends of the flow path of the sample air inlet.
The thus-flowed-in air and particles are split into a flow path leading to a PM2.5 separation section for separating particles of 2.5um or less and a flow path for transporting particles of 10um or less to a PM10 detection section without separating the particles. In the PM2.5 separation unit, conventionally, when a separation device requiring 16.7 liters of flow rate per minute is used, there is no flow rate diverted to the PM10 detection unit and PM10 and PM2.5 cannot be detected simultaneously, so a separation device having a flow rate of 5 liters per minute is used.
In the air flow path separation unit, 11.5 liters per minute of air needs to be flowed to the PM10 detection unit, and 5 liters per minute of air needs to be flowed to the PM2.5 separation unit.
For this purpose, a PM10 flow control valve and a PM2.5 flow control valve are provided on each flow path separately from the air inflow pump to perform flow control.
Fig. 2 shows an air flow path separating unit of the present application. In the figure, the left side is a PM10 detection unit, and the right side is a PM2.5 detection unit. In the figure, it was confirmed that only the PM2.5 detecting section was further provided with a PM2.5 separating section in the flow path. The PM2.5 separation section is designed to operate correctly only at a flow rate of 5 litres per minute, so the flow path on the right side is fixed at a flow rate of 5 litres per minute. As described above, since the PM10 separator requires a flow rate of 16.7 liters per minute, a flow rate of 11.5 liters is required to flow through the flow path on the PM10 detection unit side.
Fig. 3 shows a structure of a conventional air flow path separation unit. In order to satisfy the above flow rates, a flow rate of 11.5 liters per minute is required to flow to the P1, V1, D1 sides, and a flow rate of 5 liters per minute is required to flow to the P2, V2, D2 sides. Here, P represents Pressure (Pressure), V represents Fluid Volume (Fluid Volume), and D represents Diameter (Diameter).
When d1=d2, the conditions of P1> P2 and/or V1> V2 are formed, and the left-side flow path and the right-side flow path do not reach the constant velocity condition, so that the fine dust is not equally distributed.
Fig. 4 shows an improved air flow path separation unit according to the present application, which is designed with reference to fig. 3, under the condition of D1'/D2' =11.5/5. In fig. 4, P represents Pressure (Pressure), V represents Fluid Volume (Fluid Volume), and D represents Diameter (Diameter). If the entire flow path can be formed well under such conditions, the flow path is separated in a sampled state without mixing or separation of particles at least when the separation section in which the sample air is separated satisfies such conditions, and accurate detection can be performed.
Fig. 5 shows a cross-sectional view of the PM2.5 detection section according to the present application. Particles with PM2.5 or more are collected in a particle discharge bucket positioned at the left side by using a cyclone (cyclone) principle, and only particles with PM2.5 or less are moved to a detection part again through a discharge pipe. At this time, it is necessary to precisely maintain a flow rate and a flow velocity of 5 liters per minute so as to pass particles of 2.5um or less, and particles larger than this sink.
Fig. 6 shows a cross-sectional view of the PM2.5 detection section according to the present application with a viewing window. With the accumulation of particles, it is necessary to remove dust accumulated on the PM2.5 separation section side, and the dust accumulation state cannot be confirmed without opening the dust cleaning cover. In order to solve the problem, the application can also be provided with a transparent observation window at the center of the dust cleaning cover, thereby confirming the internal state without opening the dust cleaning cover.
Fig. 7 is a cross-sectional view of the PM2.5 detection section of the present application when the dust detection sensor and the detection illumination are provided. In order to enable remote confirmation of dust accumulated on the PM2.5 separation section, a dust detection sensor and detection illumination are also provided. The dust detection sensor and the detection illumination may be provided on the observation window when the observation window is provided, and the dust detection sensor and the detection illumination may be provided when the observation window is not provided, so that the internal state is confirmed from the outside.
Fig. 8 shows a black carbon detecting portion provided in the air inflow portion of the present application. In the right laser heating region, laser light in the infrared or near infrared region of 10W or more is irradiated at a certain thickness, whereby light is absorbed by black carbon and converted into heat, resulting in refraction of light. A laser lamp having excellent linearity for detecting refractive index is provided at the upper left end of fig. 8, and a linear array CCD (Linear CCD) is provided at the other side, thereby detecting a position irradiated by the laser lamp.
Fig. 9 and 10 illustrate a case where the black carbon absorbs light in the laser heating region to generate heat, so that the heated air is changed in density, and thus, the refractive index of the light is changed. Fig. 9 shows a case where a small amount of black carbon is contained in the sample air, and fig. 10 shows a case where a large amount of black carbon is contained in the sample air. The more the amount of black carbon is, the more heat is generated, thereby increasing the refraction of light, and further the position for detecting laser light is further away from the reference position. Thus, no pretreatment is required for the air flowing in, and black carbon can be continuously detected.
Claims (7)
1. A PM10 and PM2.5 simultaneous detection device having a black carbon detection section includes:
a PM10 particle sorting and air inflow device with an air inlet vertically arranged so that sample air to be detected can flow in;
a continuous black carbon detection unit provided in an internal space of the PM10 particle sorting and air flow device; and
an air flow path separation unit that separates particles of 10um or less, which are separated by the PM10 particle separation unit and the air flow unit, into two flow paths, detects particles of 10um or less, and separately re-separates particles of 2.5um or less, and detects PM2.5;
wherein one side of the air flow path separating part is connected with the PM10 beta ray detecting part,
the other side of the air flow path separating part is connected with a PM2.5 beta ray detecting part through a PM2.5 separating part,
a PM10 beta ray source and a PM2.5 beta ray source are arranged below the PM10 beta ray detection part and the PM2.5 beta ray detection part respectively,
PM10 flow control valves and PM2.5 flow control valves are arranged in the side surfaces of the PM10 beta ray source and the PM2.5 beta ray source,
a filter paper which is capable of moving while curling the side surface is arranged between the PM10 beta ray detection part and the PM2.5 beta ray detection part and between the PM10 beta ray source and the PM2.5 beta ray source,
between the PM10 beta ray detection section and the PM2.5 beta ray detection section and the PM10 beta ray source and the PM2.5 beta ray source, a pressing section is provided for pressing the filter paper so that air cannot flow on the side face of the filter paper,
the rear ends of the PM10 flow control valve and the PM2.5 flow control valve are connected with an air inflow pump,
the PM2.5 separation section separates the dust cleaning cover at intervals of a set period to clean dust accumulated in the inside, and a dust detection sensor and detection illumination for confirming the amount of dust accumulated on the PM2.5 separation section remotely without a separation device are further provided on the PM2.5 separation section.
2. The simultaneous detection device for PM10 and PM2.5 having a black carbon detecting section according to claim 1, wherein,
in the continuous black carbon detecting section, laser light in an infrared region of 10W is irradiated to a laser heating region at a certain thickness, whereby light is absorbed by black carbon and converted into heat, resulting in refraction of light.
3. The simultaneous detection device for PM10 and PM2.5 having a black carbon detecting section according to claim 2, wherein,
the continuous black carbon detection part is provided with a laser lamp with excellent straightness for detecting refractive index, and the other side of the continuous black carbon detection part is provided with a linear array CCD, so that the position irradiated by the laser lamp is detected.
4. The simultaneous detection device for PM10 and PM2.5 having a black carbon detecting section according to claim 3, wherein,
the continuous black carbon detecting part is used for detecting that the black carbon absorbs light in the laser heating area to generate heat, so that the density of the heated air changes, and the refractive index of the generated light changes.
5. The PM10 and PM2.5 simultaneous detection device having a black carbon detecting section according to claim 4, wherein,
the continuous black carbon detecting unit increases the refraction of light and further positions of the detection laser light away from the reference position as the amount of black carbon increases when a small amount of black carbon is contained in the sample air and when a large amount of black carbon is contained in the sample air.
6. The PM10 and PM2.5 simultaneous detection device having a black carbon detecting section according to claim 5, wherein,
the air inflow pump, the PM10 flow control valve, and the PM2.5 flow control valve are driven so that air flows into 16.7 litters per minute through the PM10 particle sorting and air flow device having the air inlet, 11.5 litters per minute through the PM10 beta ray detection portion, and 5 litters per minute through the PM2.5 beta ray detection portion.
7. The simultaneous detection device for PM10 and PM2.5 having a black carbon detecting section according to claim 6, wherein,
the ratio of the area of the flow path on the side of the PM10 beta ray detection unit to the area of the flow path on the side of the PM2.5 beta ray detection unit in the air flow path separation unit is 11.5 to 5.
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| KR1020230058092A KR102588106B1 (en) | 2023-05-04 | 2023-05-04 | Pm 10 pm 2.5 . |
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| WO2000046584A2 (en) | 1999-02-02 | 2000-08-10 | Rupprecht & Patashnick Company, Inc. | Differential particulate mass monitor with intrinsic correction for volatilization losses |
| KR101278289B1 (en) | 2012-01-30 | 2013-06-24 | (주)켄텍 | Dual particulate matter analyzer by using beta-ray |
| JP6430108B2 (en) | 2013-10-08 | 2018-11-28 | ホソカワミクロン株式会社 | Classification device |
| KR20180076667A (en) * | 2016-12-28 | 2018-07-06 | 인하대학교 산학협력단 | A sampling inlet device for fine particles from stack flue gases |
| DE102018117016A1 (en) * | 2017-07-14 | 2019-01-17 | Horiba Ltd. | Analyzer, system, analysis method and program |
| KR101960226B1 (en) | 2018-10-15 | 2019-03-20 | 주식회사 신코 | Apparatus for measuring black carbon |
| KR102158142B1 (en) * | 2019-02-15 | 2020-09-21 | 주식회사 다산에스엠 | device for measuring dust by different particle size in chimney |
| JP7294018B2 (en) * | 2019-09-17 | 2023-06-20 | 富士電機株式会社 | particle analyzer |
| KR102332142B1 (en) * | 2020-02-06 | 2021-11-30 | (주)켄텍 | Beta-ray type chimney fine dust measuring device with diffusion pipe |
| KR102290065B1 (en) * | 2020-02-06 | 2021-08-17 | (주)켄텍 | Beta-ray type chimney fine dust measuring device with diffusion pipe |
| KR102376031B1 (en) | 2020-07-10 | 2022-03-18 | (주)켄텍 | Fine dust measuring device using beta-ray and measuring method using the same |
| KR102474633B1 (en) | 2020-08-25 | 2022-12-06 | (주)켄텍 | Continuous beta-ray fine dust measuring device and measuring method using the same |
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