CN112881251A - Detection device and detection method for concentration of atmospheric particulate matter - Google Patents
Detection device and detection method for concentration of atmospheric particulate matter Download PDFInfo
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- CN112881251A CN112881251A CN202110059866.XA CN202110059866A CN112881251A CN 112881251 A CN112881251 A CN 112881251A CN 202110059866 A CN202110059866 A CN 202110059866A CN 112881251 A CN112881251 A CN 112881251A
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- 238000001514 detection method Methods 0.000 title claims abstract description 69
- 239000008277 atmospheric particulate matter Substances 0.000 title claims abstract description 6
- 238000005070 sampling Methods 0.000 claims abstract description 54
- 230000002285 radioactive effect Effects 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 15
- 239000000428 dust Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 230000008021 deposition Effects 0.000 claims description 3
- 239000013618 particulate matter Substances 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000005250 beta ray Effects 0.000 description 4
- 239000003570 air Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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
- G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
- G01N15/0618—Investigating concentration of particle suspensions by collecting particles on a support of the filter type
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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
- G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
- G01N15/0618—Investigating concentration of particle suspensions by collecting particles on a support of the filter type
- G01N15/0631—Separation of liquids, e.g. by absorption, wicking
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- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention discloses a detection device and a detection method for atmospheric particulate matter concentration, the device comprises a sampling mechanism, a filter paper mechanism and a detection mechanism, wherein the detection mechanism and the filter paper mechanism are arranged in a detection box; the filter paper mechanism comprises a paper feeding disc, a supporting roller and a paper collecting roller, a filter paper belt penetrates between the lifting communicating pipe and the sampling pipe, and a position identification belt is arranged on the filter paper belt; the detection mechanism comprises a detector, a position detector and a radioactive source, a detection gap is arranged between the radioactive source and the detector, and the position detector is fixed on the side surface of the detector. By adopting the detection device and the detection method for the concentration of the atmospheric particulates, the detection precision is greatly improved.
Description
Technical Field
The invention relates to the technical field of air detection, in particular to a device and a method for detecting the concentration of atmospheric particulates.
Background
The Beta ray method based device for measuring the concentration of atmospheric particulate matters utilizes the Beta ray attenuation principle, ambient air is sucked into a sampling tube by a sampling pump, and is discharged after passing through a filter membrane, particulate matters are precipitated on the filter membrane, when the Beta ray passes through the filter membrane deposited with the particulate matters, the energy of the Beta ray is attenuated, and the concentration of the particulate matters can be calculated by measuring the attenuation.
The device of current atmospheric particulates concentration has certain drawback when using, and current device all sets up in outdoor, because contains a large amount of dusts and moisture in the air, and moisture adheres to the internal surface at the surge drum to attract dust adhesion to the internal surface at surge drum on every side, influence the accurate nature of data detected, the filter paper location is not accurate and the detection direct influence accurate nature of flow simultaneously.
Disclosure of Invention
The invention aims to provide a device and a method for detecting the concentration of atmospheric particulates, which greatly improve the detection precision.
In order to achieve the purpose, the invention provides a device for detecting the concentration of atmospheric particulates, which comprises a sampling mechanism, a filter paper mechanism and a detection mechanism, wherein the detection mechanism and the filter paper mechanism are arranged in a detection box;
the filter paper mechanism comprises a paper feeding disc, a supporting roller and a paper collecting roller, the filter paper belt penetrates through the space between the lifting communicating pipe and the sampling pipe, and a position identification belt is arranged on the filter paper belt;
the detection mechanism comprises a detector, a position detector and a radioactive source, a detection gap is formed between the radioactive source and the detector, and the position detector is fixed on the side face of the detector.
Preferably, the heating layer set up in sampling tube bottom just is provided with the heat insulating ring, heat insulating ring bottom is fixed with the sealing washer.
Preferably, the position identification band is a reflective band, and the position detector is a photoelectric sensor.
Preferably, the sampling pipe is provided with a first flowmeter, the lifting communicating pipe is provided with a second flowmeter, the first flowmeter and the second flowmeter are both connected with the controller, and the detection mechanism and the heating layer are both connected with the controller.
A detection method based on a detection device for the concentration of atmospheric particulates comprises the following steps,
step S1: starting a heating layer to carry out preheating operation on the sampling pipe;
step S2: detecting according to a set detection period, starting detection, moving unused filter paper to the position below a sampling pipe by a filter paper mechanism, detecting by a photoelectric sensor, stopping rotation of the filter paper mechanism when the filter paper reaches a proper position, lifting a lifting communicating pipe to be in contact with the sampling pipe, and starting a sampling pump;
step S3: the controller counts time, the first flowmeter and the second flowmeter perform flow detection, and the sampling pump stops running when the set time is reached;
step S4: and the lifting communicating pipe descends, the filter paper mechanism moves the filter paper to the lower part of the detector for detection, and the detection result is sent to the controller for calculation to obtain the concentration.
Further, the concentration calculation formula is as follows,
wherein A is the dust deposition area on the filter belt, delta t is the sampling time, Q is the average value of the first flowmeter and the second flowmeter, I0The number of beta particles when no dust is adsorbed, the number of beta particles when dust passes through the adsorption device, and mu is a mass attenuation coefficient.
Therefore, according to the detection device and the detection method for the concentration of the atmospheric particulates, which are disclosed by the invention, the water absorption layer and the heating layer are arranged in the sampling pipe, so that the detection precision is prevented from being influenced by water vapor, meanwhile, the filter paper belt is provided with the position identification belt, the filter paper is more reliably positioned, and the plurality of flowmeters are arranged, so that the detection precision is greatly improved.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for detecting atmospheric particulate concentration according to the present invention;
fig. 2 is a schematic structural diagram of the filter paper tape of the invention.
Reference numerals
1. A particulate cutter; 2. a sampling tube; 21. a water-absorbing layer; 22. a heating layer; 23. a heat insulating ring; 3. a first flow meter; 4. a detection box; 5. a lifting communicating pipe; 51. a lifting cylinder; 6. a second flow meter; 7. a sampling pump; 8. a detector; 9. a position detector; 10. a radioactive source; 11. a paper discharge tray; 12. a support roller; 13. a paper collecting roller; 14. filtering the paper tape; 141. a reflective tape.
Detailed Description
Examples
Fig. 1 is a schematic structural view of an atmospheric particulate concentration detection device of the present invention, and fig. 2 is a schematic structural view of a filter tape of the present invention. Detection mechanism and filter paper mechanism all set up in detection case 4, sampling mechanism includes particulate matter cutterbar 1, sampling pipe 2, lift communicating pipe 5 and sampling pump 7, sampling pump 7 is linked together with lift communicating pipe 5 one end, lift communicating pipe 5 bottom is fixed with lift cylinder 51, lift communicating pipe 5 other end and sampling pipe 2 bottom set up relatively, sampling pipe 2 is provided with first flowmeter 3, lift communicating pipe 5 is last to be set up second flowmeter 6, first flowmeter 3 and second flowmeter 6 all are connected with controller (not drawn in the picture), improve the flow detection precision. The inner wall of the sampling pipe 2 is fixed with a water absorption layer 21 and a heating layer 22, the heating layer 22 is connected with a controller, and the water absorption layer 21 is made of water absorption materials and keeps the dryness in the sampling pipe 2. Meanwhile, the heating layer 22 further dries the gas in the sampling tube 2, and the dryness of the air passing through the filtering paper tape 14 is kept to meet the requirement. The zone of heating 22 sets up in sampling pipe 2 bottom and is provided with thermal-insulated ring 23, and thermal-insulated ring 23 bottom is fixed with the sealing washer, and the sealing washer is the rubber circle, at the sampling in-process, guarantees sampling pipe 2 and 5 gas tightness of lift communicating pipe.
The filter paper mechanism comprises a paper feeding tray 11, a supporting roller 12 and a paper collecting roller 13, a filter paper tape 14 penetrates between the lifting communicating pipe 5 and the sampling pipe 2, and a position identification tape is arranged on the filter paper tape 14 and is a reflective tape 141. The detection mechanism comprises a detector 8, a position detector 9 and a radioactive source 10, a detection gap is formed between the radioactive source 10 and the detector 8, the position detector 9 is fixed on the side face of the detector 8, the position detector 8 is a photoelectric sensor, and when the reflective tape 141 passes through the photoelectric sensor, the controller controls the filter paper tape 14 to stop advancing, so that the adsorption filter paper tape is ensured to be opposite to the detector 8.
A detection method of a detection device based on the concentration of atmospheric particulates comprises the following steps,
step S1: and starting the heating layer to preheat the sampling pipe, and ensuring the drying in the sampling pipe.
Step S2: detecting according to a set detection period, starting detection, moving unused filter paper to the position below a sampling pipe by a filter paper mechanism, detecting by a photoelectric sensor, stopping rotation of the filter paper mechanism when the filter paper reaches a proper position, lifting a lifting communicating pipe to be in contact with the sampling pipe, and starting a sampling pump;
step S3: the controller counts time, the first flowmeter and the second flowmeter perform flow detection, and the sampling pump stops running when the set time is reached;
step S4: and the lifting communicating pipe descends, the filter paper mechanism moves the filter paper to the lower part of the detector for detection, and the detection result is sent to the controller for calculation to obtain the concentration.
Further, the concentration calculation formula is as follows,
wherein A is the dust deposition area on the filter belt, delta t is the sampling time, Q is the average value of the first flowmeter and the second flowmeter, I0The number of beta particles when no dust is adsorbed, the number of beta particles when dust passes through the adsorption device, and mu is a mass attenuation coefficient.
Therefore, according to the detection device and the detection method for the concentration of the atmospheric particulates, which are disclosed by the invention, the water absorption layer and the heating layer are arranged in the sampling pipe, so that the detection precision is prevented from being influenced by water vapor, meanwhile, the filter paper belt is provided with the position identification belt, the filter paper is more reliably positioned, and the plurality of flowmeters are arranged, so that the detection precision is greatly improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.
Claims (6)
1. The utility model provides a detection apparatus for atmospheric particulates concentration, includes sampling mechanism, filter paper mechanism and detection mechanism, detection mechanism with filter paper mechanism all sets up its characterized in that in the detection case:
the sampling mechanism comprises a particulate matter cutter, a sampling pipe, a lifting communicating pipe and a sampling pump, the sampling pump is communicated with one end of the lifting communicating pipe, a lifting cylinder is fixed at the bottom of the lifting communicating pipe, the other end of the lifting communicating pipe is arranged opposite to the bottom of the sampling pipe, and a water absorbing layer and a heating layer are fixed on the inner wall of the sampling pipe;
the filter paper mechanism comprises a paper feeding disc, a supporting roller and a paper collecting roller, a filter paper belt penetrates between the lifting communicating pipe and the sampling pipe, and a position identification belt is arranged on the filter paper belt;
the detection mechanism comprises a detector, a position detector and a radioactive source, a detection gap is formed between the radioactive source and the detector, and the position detector is fixed on the side face of the detector.
2. The atmospheric particulate matter concentration detection apparatus according to claim 1, characterized in that: the zone of heating set up in sampling tube bottom portion just is provided with thermal-insulated ring, thermal-insulated ring bottom is fixed with the sealing washer.
3. The atmospheric particulate matter concentration detection apparatus according to claim 2, characterized in that: the position identification band is a reflective band, and the position detector is a photoelectric sensor.
4. The atmospheric particulate matter concentration detection apparatus according to claim 3, characterized in that: the sampling pipe is provided with a first flowmeter, the lifting communicating pipe is provided with a second flowmeter, the first flowmeter and the second flowmeter are connected with the controller, and the detection mechanism and the heating layer are connected with the controller.
5. A detection method based on the atmospheric particulate concentration detection device according to any one of claims 1 to 4, characterized in that: the specific steps are as follows,
step S1: starting a heating layer to carry out preheating operation on the sampling pipe;
step S2: detecting according to a set detection period, starting detection, moving unused filter paper to the position below a sampling pipe by a filter paper mechanism, detecting by a photoelectric sensor, stopping rotation of the filter paper mechanism when the filter paper reaches a proper position, lifting a lifting communicating pipe to be in contact with the sampling pipe, and starting a sampling pump;
step S3: the controller counts time, the first flowmeter and the second flowmeter perform flow detection, and the sampling pump stops running when the set time is reached;
step S4: and the lifting communicating pipe descends, the filter paper mechanism moves the filter paper to the lower part of the detector for detection, and the detection result is sent to the controller for calculation to obtain the concentration.
6. The method for detecting the concentration of atmospheric particulates according to claim 5, characterized in that: the formula for the calculation of the concentration is as follows,
wherein A is the dust deposition area on the filter belt, delta t is the sampling time, Q is the average value of the first flowmeter and the second flowmeter,I0the number of beta particles when no dust is adsorbed, the number of beta particles when dust passes through the adsorption device, and mu is a mass attenuation coefficient.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110059866.XA CN112881251A (en) | 2021-01-18 | 2021-01-18 | Detection device and detection method for concentration of atmospheric particulate matter |
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| CN202110059866.XA CN112881251A (en) | 2021-01-18 | 2021-01-18 | Detection device and detection method for concentration of atmospheric particulate matter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114689477A (en) * | 2022-03-29 | 2022-07-01 | 杭州春来科技有限公司 | Atmospheric particulate analysis detection device |
| CN116773416A (en) * | 2023-06-27 | 2023-09-19 | 山东省泰安生态环境监测中心 | Automatic monitoring device and method for atmospheric particulate matters |
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