CN111855374A - Medium-flow atmospheric fine particulate concentration device and method - Google Patents
Medium-flow atmospheric fine particulate concentration device and method Download PDFInfo
- Publication number
- CN111855374A CN111855374A CN202010727119.4A CN202010727119A CN111855374A CN 111855374 A CN111855374 A CN 111855374A CN 202010727119 A CN202010727119 A CN 202010727119A CN 111855374 A CN111855374 A CN 111855374A
- Authority
- CN
- China
- Prior art keywords
- concentration
- water tank
- flow
- nozzle
- condensation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000002245 particle Substances 0.000 claims abstract description 38
- 238000009833 condensation Methods 0.000 claims abstract description 30
- 230000005494 condensation Effects 0.000 claims abstract description 30
- 239000010419 fine particle Substances 0.000 claims abstract description 16
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 238000005485 electric heating Methods 0.000 claims abstract description 7
- 239000008367 deionised water Substances 0.000 claims description 14
- 229910021641 deionized water Inorganic materials 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 6
- 239000013618 particulate matter Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 125000003158 alcohol group Chemical group 0.000 claims 1
- 239000012141 concentrate Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 5
- 231100000419 toxicity Toxicity 0.000 description 5
- 230000001988 toxicity Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 208000024172 Cardiovascular disease Diseases 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 2
- 239000000443 aerosol Substances 0.000 description 2
- 208000026106 cerebrovascular disease Diseases 0.000 description 2
- 230000001684 chronic effect Effects 0.000 description 2
- 230000002526 effect on cardiovascular system Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 208000017667 Chronic Disease Diseases 0.000 description 1
- 206010058467 Lung neoplasm malignant Diseases 0.000 description 1
- 206010035664 Pneumonia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 231100000481 chemical toxicant Toxicity 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000008821 health effect Effects 0.000 description 1
- 210000000987 immune system Anatomy 0.000 description 1
- 201000005202 lung cancer Diseases 0.000 description 1
- 208000020816 lung neoplasm Diseases 0.000 description 1
- 210000000653 nervous system Anatomy 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 238000012502 risk assessment Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4055—Concentrating samples by solubility techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4022—Concentrating samples by thermal techniques; Phase changes
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4022—Concentrating samples by thermal techniques; Phase changes
- G01N2001/4033—Concentrating samples by thermal techniques; Phase changes sample concentrated on a cold spot, e.g. condensation or distillation
Landscapes
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention belongs to the technical field of environmental protection, and particularly relates to a medium-flow atmospheric fine particulate concentration device and method. The inventive device comprises an impact PM2.5The cutting machine comprises a cutting head, a water tank system, a virtual cutting system and a condensation circulating system; the water tank system comprises a water tank, an electric heating rod, a temperature control digital display device and a PM2.5The cutting head is communicated with the water tank; the virtual cutting system comprises a virtual cutter, a concentrated airflow vacuum pump and a main airflow vacuum pump; the condensation circulating system comprises a condensing agent circulating pipe and a condensing machine; the condensation circulating system is used for circulating and circulating condensate to condense and grow saturated particles; an air flow outlet of the water tank is coaxially arranged with the beginning end of a condensation inner pipe in the condensation circulating system, and the terminal end of the condensation inner pipe is connected with a nozzle in the virtual cutting system. The device can concentrate actual atmospheric fine particles by 7 to 10 times, has high concentration efficiency which reaches 75 to 99 percent, and has stable concentration performance; the device is simple and convenient to operate, reliable and stable, and easy to maintainAnd the cost is low.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a particulate matter concentration device and method, in particular to a medium-flow atmospheric fine particulate matter concentration device and method.
Technical Field
PM2.5Refers to particles having an aerodynamic diameter of less than or equal to 2.5 microns in the atmosphere, also known as atmospheric fine particles. Albeit PM2.5But only the earth's atmospheric constituents are very small in content, but they have a significant effect on air quality and visibility. Atmospheric PM2.5Small grain size, large specific surface area, containing a large amount of toxic and harmful substances, long suspension time in the atmosphere and long transmission distance, thereby having no negligence on the negative effects of human health and atmospheric environmental quality.
In recent years, atmospheric PM of China2.5The pollution is serious, and the haze pollution is often caused, so that the treatment rate is increased rapidly and susceptible people die too early. Particularly, toxic and harmful chemical components carried by aerosol particles under haze endanger the health of people, and cause high social attention. There has been a great deal of epidemiological evidence that PM is indicative of2.5Has acute and chronic health effects. High concentration PM2.5Exposure increases the risk of acute respiratory and cardiovascular and cerebrovascular diseases, while PM is present2.5It may induce chronic diseases such as lung cancer, Chronic Obstructive Pneumonia (COPD), cardiovascular and cerebrovascular diseases, etc., and affect immune system and nervous system of human body. Therefore, the study of particle toxicity of haze aerosol has also become one of the hot spots and the leading direction. However, the determination of the toxicity of the fine atmospheric particulates is limited by detection techniques and instruments (such as a high detection limit), and currently, the determination is still performed in an off-line detection stage, and needs to be performed under the conditions of heavy pollution and a long continuous sampling time, and thus the requirements for monitoring the concentration and toxic chemical components of the fine atmospheric particulates in real time cannot be met.
In order to fill the technical blank, the medium-flow atmospheric fine particle concentrating device developed by the invention can concentrate and enrich atmospheric fine particles to a level enough for obviously detecting the toxicity of the atmospheric fine particles on the premise of not changing any physicochemical property of the atmospheric fine particles. Meanwhile, the device can be used together with an online toxicity detection device, so that the realization of online toxicity detection of the artificial intelligent atmospheric fine particles becomes possible in the future, and the device can be widely applied to environmental monitoring and health risk assessment.
Disclosure of Invention
The invention aims to provide a device and a method for concentrating medium-flow atmospheric fine particles, which are reliable and stable and can be used for efficiently concentrating. The medium flow here is 50. + -.1 l/min.
The structure of the medium-flow atmospheric fine particulate concentrating device provided by the invention is shown in figure 1; the device comprises: impact PM2.5The cutting machine comprises a cutting head, a water tank heating system, a virtual cutting system and a condensation circulating system; wherein:
the collision type PM2.5Cutting head comprising PM10、PM5、PM2.5The three-stage impact separation and collection plate is of the same structure, and the number of holes and the aperture of the three-stage impact plate are different due to different impact inertias of particles with different particle diameters;
the water tank heating system comprises a water tank (9) for containing deionized water, and a heat insulation layer (10) is arranged on the inner wall of the water tank (9) and used for preserving the heat of the deionized water in the water tank (9); one side of the water tank (9) is provided with a visible window (11) for observing the height of the water surface in the tank body; an electric heating rod (12) with a temperature sensor is arranged in the water tank (9) and used for heating the deionized water; a temperature control digital display device (13) is arranged in the water tank (9) and is used for controlling the temperature of the deionized water; impact PM2.5The cutting head (7) is communicated with the water tank (9);
the virtual cutting system comprises a virtual cutter (17), a concentrated airflow vacuum pump (2) and a main airflow vacuum pump (3); wherein the virtual cutter (17) comprises a nozzle (19), a nozzle connecting pipe (20) and two air paths: a main gas path and a concentration gas path; the nozzle (19) and the nozzle connecting pipe (20) are coaxially arranged, the nozzle connecting pipe (20) is arranged above the nozzle (19) and is spaced by a certain gap, and the nozzle connecting pipe (20) is used for receiving particles sprayed by the nozzle (19); the concentrated airflow vacuum pump (2) is communicated with a concentrated air passage at the upper part of the virtual cutter (17) through a pipeline, and a float flowmeter (1) is arranged on the communicated pipeline and used for metering the flow of the pipeline; the main air flow vacuum pump (3) is communicated with a main air path outlet (18) at the upper part of the virtual cutter (17) through a pipeline, a drying pipe (4) and a large-flow mass flow controller (5) are arranged on the communicated pipeline, the drying pipe (4) is used for drying air flow so as to prevent the water vapor of the system from excessively damaging a pump body, and the large-flow mass flow controller (5) is used for accurately controlling the flow of the pipeline;
the condensation circulating system comprises a condensing agent circulating pipe (6) and a condenser (8); the condensing agent circulating pipe (6) comprises a condensing inner pipe (14), a soft copper spiral pipe (15) is tightly wound outside the condensing inner pipe (14), and the beginning end and the end of the spiral pipe (15) are respectively connected with an outlet and an inlet of the condensing machine (8); a heat insulation layer (16) is wrapped outside the spiral pipe (15), so that the temperature of the condensation pipe is not influenced by the outside temperature, and the condensation circulating system is used for circulating and circulating condensate to condense and grow saturated particles;
an airflow outlet of the water tank (9) is coaxially arranged with the beginning end of a condensation inner pipe (14) in a condensation circulating system and is connected by a quick-connection flange (containing a sealing ring); the end of the condensation inner pipe (14) is connected with a nozzle (19) in the virtual cutting system.
The invention provides an atmospheric fine particulate matter concentration device, which comprises the following working procedures:
(1) to collision type PM2.5The cutting head (7) is arranged in the actual atmospheric environment, and the original atmospheric sample passes through the collision type PM2.5The cutting head (7) discharges PM2.5Atmospheric fine particles with the aerodynamic equivalent diameter less than or equal to 2.5 microns are screened out and enter a water tank (9) by means of system suction;
(2) under a visible window (11), adding deionized water to two thirds of the height of the water tank, heating the deionized water by using an electric heating rod (12) with a temperature sensor, and controlling the temperature to be 45 +/-2 ℃ by using a temperature control digital display device (13) to enable the generated water vapor to enable particles to reach a saturated state;
(3) the particles reaching the saturated state flow through a condensation inner pipe (14) of the condensation circulating system; the external circulation temperature control mode of the condenser controls the temperature to be minus 19 +/-1 ℃, so that the circulating condensate liquid condenses and grows saturated particles, wherein most PM2.5Can grow to 3-4 microns in aerodynamic diameter;
(4) condensing the growing PM2.5The particles enter the virtual cutter (17) and are accelerated at the nozzle (19); the accelerating power of the device comes from two gas paths, namely a main gas path and a concentration gas path; in the main gas path, the main flow is accurately controlled to be 50 +/-1 liter/minute by a large-flow mass flow controller (5); in the concentration gas path, the particles accelerated by the nozzle (19) are received by a nozzle connecting pipe (20) above the coaxially arranged nozzle, and the flow of the concentrated gas flow is controlled to be 5 liters/minute; theoretically, under the condition that the concentration of the particulate matters is the same, the gas flow rate is changed to be one tenth of the original gas flow rate, and the concentration of the particulate matters in the sample is changed to be ten times of the original concentration, so that the concentration effect is achieved.
After the concentration is finished, finally passing through a concentration factor (PM in the atmosphere after concentration)2.5Mass concentration/number concentration/chemical component concentration of (1) and PM in the atmosphere before concentration2.5The ratio of mass concentration/number concentration/chemical component concentration) and the concentration efficiency (concentration after actual concentration as a percentage of the theoretical concentration) were evaluated.
In the device, the condensing agent in the condensing machine adopts alcohol, the concentration of which can be adjusted, and the effects of refrigerating and reducing the volatilization amount are only needed;
the diameter of the condensation inner pipe (14) is 2.5 cm, and the length is 80 cm;
the control range of the flow controller (5) is 0-200L/min;
the diameter of the nozzle is 0.37 cm, the spacing gap between the nozzle (9) and the nozzle connecting pipe (20) is 0.45 cm, and the diameter of the nozzle connecting pipe is 2.5 cm.
The invention has the beneficial effects that:
(1) the device can concentrate actual atmospheric fine particles by 7 to 10 times (the particle size is related), the concentration efficiency is high and can reach 75 to 99 percent (the particle size is related), and the concentration performance is stable;
(2) the device has low requirements on the flow of sampled inlet air, and the actual atmospheric fine particles can be efficiently concentrated when the medium flow is 50 liters/minute;
(3) the device is simple and convenient to operate, reliable and stable, easy to maintain and low in cost.
Drawings
FIG. 1 is a schematic diagram of a medium flow atmospheric fine particulate concentration device. Wherein, the lower diagram is a diagram of a virtual slicer structure.
Reference numbers in the figures: 1 is a float flowmeter, 2 is a concentrated airflow vacuum pump, 3 is a main airflow vacuum pump, 4 is a drying pipe, 5 is a mass flow controller, 6 is a condensing agent circulating pipe, and 7 is collision type PM2.5The cutting head, 8 is a condenser, 9 is a water tank, 10 is a water tank heat insulation layer, 11 is a visible window, 12 is an electric heating rod with a temperature sensor, 13 is a temperature control digital display device, 14 is a condensation inner pipe, 15 is a condensation outer spiral pipe, 16 is a heat insulation layer, 17 is a virtual cutter, 18 is a main air outlet, 19 is a nozzle, and 20 is a nozzle connecting pipe.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Example 1
(1) To collision type PM2.5The cutting head (7) is arranged outside a 6-storey window of an environment building of the university of Compound Dan in an impact PM2.5Under the action of a cutting head (7), PM2.5Atmospheric fine particles with the aerodynamic equivalent diameter less than or equal to 2.5 microns are screened out and enter a water tank (9) by means of pumping force provided by a main gas circuit and a concentration gas circuit;
(2) under a visible window (11), deionized water is added to two thirds of the height of a water tank, an electric heating rod (12) with a temperature sensor is used for heating the deionized water, the temperature is controlled to be 45 +/-2 ℃ through a temperature control digital display device (13), the generated water vapor enables particulate matters to reach a saturated state, the ambient temperature in an external field experiment does not exceed 24 ℃, the supersaturated ambient temperature in the water tank (9) is actually reduced to 31 ℃ or lower by injecting low-temperature airflow, and the loss of volatile or semi-volatile components in the particulate matters can be greatly reduced by setting a parameter with a small difference with the actual ambient temperature;
(3) PM reaching saturation state2.5Particles flowing through a condensation inner tube (14) of the condensation circulation system; the external circulation temperature control mode of the condenser controls the temperature to be minus 19 +/-1 ℃, so that the circulating condensate liquid condenses and grows saturated particles, wherein most PM2.5Can grow to 3-4 microns in aerodynamic diameter;
(4) condensing the growing PM2.5The particles enter the virtual cutter (17) and are accelerated at the nozzle (19); the accelerating power of the device comes from two gas paths, namely a main gas path and a concentration gas path; in the main gas path, the main flow is accurately controlled to be 50 +/-1 liter/minute by a large-flow mass flow controller (5); in the concentration gas path, the particles accelerated by the nozzle (19) are received by a nozzle connecting pipe (20) above the coaxially arranged nozzle, and the flow of the concentrated gas flow is controlled to be 5 liters/minute; theoretically, under the condition that the concentration of the particulate matters is the same, the gas flow rate is changed to be one tenth of the original gas flow rate, and the concentration of the particulate matters in the sample is changed to be ten times of the original concentration, so that the concentration effect is achieved.
In the concentration process, the sample inlets of the two scanning electric mobility particle size spectrometers are respectively connected with a concentration gas circuit of the enrichment system and the actual atmosphere, and the number concentration and the mass concentration of particles (10 to 1000 nanometers) in each particle size range in the system and the actual atmosphere are continuously monitored, so that concentration factors (PM in the atmosphere after concentration) are calculated2.5Mass/number concentration of (2) and PM in the atmosphere before concentration2.5Mass concentration/number concentration ratio) and concentration efficiency (concentration after actual concentration as a percentage of the theoretical concentration), detailed data are shown in table 1. Two scans of the mobility particle sizeThe spectrometer flow rate was set to 0.3 l/min, so when connected to the enrichment system, 0.3 l/min of the gas flow in the concentrate gas line entered the scanning mobility particle size spectrometer, and the remaining 4.7 l/min of the gas flow could be used for subsequent particle sampling or real-time monitoring. In addition, because system steam is too big, be difficult for direct access to scan mobility particle size spectrometer, need add the drying tube in the front end and get rid of steam and reduce the particle size.
TABLE 1 enrichment efficiency of different particle size particles in real atmospheric environment
Claims (6)
1. A medium flow atmospheric fine particle concentrating device, comprising: impact PM2.5The cutting machine comprises a cutting head (7), a water tank heating system, a virtual cutting system and a condensation circulating system; wherein:
the collision type PM2.5Cutting head comprising PM10、PM5、PM2.5The three-stage impact separation and collection plate is of the same structure, and the number of holes and the aperture of the three-stage impact plate are different due to different impact inertias of particles with different particle diameters;
the water tank heating system comprises a water tank (9) for containing deionized water, and a heat insulation layer (10) is arranged on the inner wall of the water tank (9) and used for preserving the heat of the deionized water in the water tank (9); one side of the water tank (9) is provided with a visible window (11) for observing the height of the water surface in the tank body; an electric heating rod (12) with a temperature sensor is arranged in the water tank (9) and used for heating the deionized water; a temperature control digital display device (13) is arranged in the water tank (9) and is used for controlling the temperature of the deionized water; the PM2.5The cutting head (7) is communicated with the water tank (9);
the virtual cutting system comprises a virtual cutter (17), a concentrated airflow vacuum pump (2) and a main airflow vacuum pump (3); wherein the virtual cutter (17) comprises a nozzle (19), a nozzle connecting pipe (20) and two air paths: a main gas path and a concentration gas path; the nozzle (19) and the nozzle connecting pipe (20) are coaxially arranged, the nozzle connecting pipe (20) is arranged above the nozzle (19) and is spaced by a certain gap, and the nozzle connecting pipe (20) is used for receiving particles sprayed by the nozzle (19); the concentrated airflow vacuum pump (2) is communicated with a concentrated air passage at the upper part of the virtual cutter (17) through a pipeline, and a float flowmeter (1) is arranged on the communicated pipeline and used for metering the flow of the pipeline; the main air flow vacuum pump (3) is communicated with a main air path outlet (18) at the upper part of the virtual cutter (17) through a pipeline, a drying pipe (4) and a large-flow mass flow controller (5) are arranged on the communicated pipeline, the drying pipe (4) is used for drying air flow so as to prevent the water vapor of the system from excessively damaging a pump body, and the large-flow mass flow controller (5) is used for accurately controlling the flow of the pipeline;
the condensation circulating system comprises a condensing agent circulating pipe (6) and a condenser (8); the condensing agent circulating pipe (6) comprises a condensing inner pipe (14), a soft copper spiral pipe (15) is tightly wound outside the condensing inner pipe (14), and the beginning end and the end of the spiral pipe (15) are respectively connected with an outlet and an inlet of the condensing machine (8); a heat insulation layer (16) is wrapped outside the spiral pipe (15), so that the temperature of the condensation pipe is not influenced by the outside temperature, and the condensation circulating system is used for circulating and circulating condensate to condense and grow saturated particles;
an airflow outlet of the water tank (9) is coaxially arranged with the beginning end of a condensation inner pipe (14) in a condensation circulating system and is connected by a quick-connection flange (containing a sealing ring); the end of the condensation inner pipe (14) is connected with a nozzle (19) in the virtual cutting system.
2. The apparatus as claimed in claim 1, wherein the condensing agent in the condenser is alcohol, and the concentration of the alcohol is adjustable to achieve the effects of refrigerating and reducing the amount of volatile matter.
3. The apparatus for concentrating medium flow atmospheric fine particulate matter according to claim 1, wherein the condensation inner tube (14) has a diameter of 2.5 cm and a length of 80 cm.
4. The apparatus for concentrating medium flow atmospheric fine particles according to claim 1, wherein the nozzle diameter is 0.37 cm, the nozzle (9) is spaced from the nozzle connection (20) by 0.45 cm, and the nozzle connection has a diameter of 2.5 cm.
5. A method for concentrating medium-flow atmospheric fine particles based on the device of claim 1, 2 or 3 is characterized by comprising the following specific steps:
(1) mixing PM2.5The cutting head (7) is arranged in the actual atmosphere environment, and the original atmosphere sample passes through PM2.5The cutting head (7) discharges PM2.5Atmospheric fine particles with the aerodynamic equivalent diameter less than or equal to 2.5 microns are screened out and enter a water tank (9) by means of system suction;
(2) under a visible window (11), adding deionized water to two thirds of the height of the water tank, heating the deionized water by using an electric heating rod (12) with a temperature sensor, and controlling the temperature to be 45 +/-2 ℃ by using a temperature control digital display device (13) to enable the generated water vapor to enable particles to reach a saturated state;
(3) the particles reaching the saturated state flow through a condensation inner pipe (14) of the condensation circulating system; the external circulation temperature control mode of the condenser controls the temperature to be minus 19 +/-1 ℃, so that the circulating condensate liquid condenses and grows saturated particles, wherein most PM2.5Can grow to 3-4 microns in aerodynamic diameter;
(4) condensing the growing PM2.5The particles enter the virtual cutter (17) and are accelerated at the nozzle (19); the accelerating power of the device comes from two gas paths, namely a main gas path and a concentration gas path; in the main gas path, the main flow is accurately controlled to be 50 +/-1 liter/minute by a large-flow mass flow controller (5); in the concentration gas path, the particles accelerated by the nozzle (19) are received by a nozzle connecting pipe (20) above the coaxially arranged nozzle, and the flow of the concentrated gas flow is controlled to be 5 liters/minute; theoretically, in the case of the same concentration of particulate matter,the gas flow is changed into one tenth of the original gas flow, and the concentration of the particulate matters in the sample is changed into ten times of the original concentration, so that the concentration effect is achieved.
6. The method for concentrating medium flow atmospheric fine particulate matter according to claim 5, wherein after the concentration is completed, a concentration factor and a concentration efficiency are finally evaluated; wherein, the concentration factor refers to: PM in atmosphere after concentration2.5Mass concentration/number concentration/chemical component concentration of (1) and PM in the atmosphere before concentration2.5The ratio of mass concentration/number concentration/chemical component concentration of (a); the concentration efficiency is as follows: the actual post-concentration is a percentage of the theoretical concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010727119.4A CN111855374A (en) | 2020-07-26 | 2020-07-26 | Medium-flow atmospheric fine particulate concentration device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010727119.4A CN111855374A (en) | 2020-07-26 | 2020-07-26 | Medium-flow atmospheric fine particulate concentration device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111855374A true CN111855374A (en) | 2020-10-30 |
Family
ID=72950150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010727119.4A Pending CN111855374A (en) | 2020-07-26 | 2020-07-26 | Medium-flow atmospheric fine particulate concentration device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111855374A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112747974A (en) * | 2020-12-14 | 2021-05-04 | 复旦大学 | Device and method for collecting atmospheric aerosol and measuring small-molecular organic acid through online concentration |
| CN112763277A (en) * | 2020-12-14 | 2021-05-07 | 复旦大学 | System and method for on-line concentration and collection of atmospheric aerosol and oral-nasal exposure |
| CN112763588A (en) * | 2020-12-14 | 2021-05-07 | 复旦大学 | Device and method for combining concentration enrichment of atmospheric fine particulate matters and toxicity detection of chemical components |
| CN112763653A (en) * | 2020-12-14 | 2021-05-07 | 复旦大学 | Device and method for collecting atmospheric fine particulate concentrated solution on line and measuring total toxicity |
| CN112763269A (en) * | 2020-12-14 | 2021-05-07 | 复旦大学 | Device and method for collecting and measuring sulfite and nitrite through on-line separation and concentration of atmospheric PM2.5 |
| CN112763278A (en) * | 2020-12-14 | 2021-05-07 | 复旦大学 | System and method for collecting atmospheric aerosol in online concentration mode and conducting temperature and humidity control exposure experiment |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020134137A1 (en) * | 2001-01-25 | 2002-09-26 | Ondov John M. | System and method for collecting samples of atmospheric aerosol particles for near-real time analysis |
| CN2856967Y (en) * | 2005-11-17 | 2007-01-10 | 上海仪器仪表研究所 | Medium flow air particles sampler |
| CN104280273A (en) * | 2013-07-02 | 2015-01-14 | 香港城市大学 | High flow capacity multi-function aerosol-to-hydrosol air sampler and sampling method |
| CN105067417A (en) * | 2015-08-05 | 2015-11-18 | 夏禹时进科技（北京）有限公司 | Gas fine particulate matter concentration enrichment device |
| CN204855238U (en) * | 2015-05-26 | 2015-12-09 | 北京慧荣和科技有限公司 | PM2. 5 aerosol concentration enrichment system |
| CN106289850A (en) * | 2015-05-26 | 2017-01-04 | 北京慧荣和科技有限公司 | Air particle online enrichment method mouth and nose exposure system |
| CN106289936A (en) * | 2015-05-26 | 2017-01-04 | 北京慧荣和科技有限公司 | Aerosol enrichment method system |
| CN212621819U (en) * | 2020-07-26 | 2021-02-26 | 复旦大学 | Medium-flow atmospheric fine particulate concentration device |
-
2020
- 2020-07-26 CN CN202010727119.4A patent/CN111855374A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020134137A1 (en) * | 2001-01-25 | 2002-09-26 | Ondov John M. | System and method for collecting samples of atmospheric aerosol particles for near-real time analysis |
| CN2856967Y (en) * | 2005-11-17 | 2007-01-10 | 上海仪器仪表研究所 | Medium flow air particles sampler |
| CN104280273A (en) * | 2013-07-02 | 2015-01-14 | 香港城市大学 | High flow capacity multi-function aerosol-to-hydrosol air sampler and sampling method |
| CN204855238U (en) * | 2015-05-26 | 2015-12-09 | 北京慧荣和科技有限公司 | PM2. 5 aerosol concentration enrichment system |
| CN106289850A (en) * | 2015-05-26 | 2017-01-04 | 北京慧荣和科技有限公司 | Air particle online enrichment method mouth and nose exposure system |
| CN106289936A (en) * | 2015-05-26 | 2017-01-04 | 北京慧荣和科技有限公司 | Aerosol enrichment method system |
| CN105067417A (en) * | 2015-08-05 | 2015-11-18 | 夏禹时进科技（北京）有限公司 | Gas fine particulate matter concentration enrichment device |
| CN212621819U (en) * | 2020-07-26 | 2021-02-26 | 复旦大学 | Medium-flow atmospheric fine particulate concentration device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112747974A (en) * | 2020-12-14 | 2021-05-04 | 复旦大学 | Device and method for collecting atmospheric aerosol and measuring small-molecular organic acid through online concentration |
| CN112763277A (en) * | 2020-12-14 | 2021-05-07 | 复旦大学 | System and method for on-line concentration and collection of atmospheric aerosol and oral-nasal exposure |
| CN112763588A (en) * | 2020-12-14 | 2021-05-07 | 复旦大学 | Device and method for combining concentration enrichment of atmospheric fine particulate matters and toxicity detection of chemical components |
| CN112763653A (en) * | 2020-12-14 | 2021-05-07 | 复旦大学 | Device and method for collecting atmospheric fine particulate concentrated solution on line and measuring total toxicity |
| CN112763269A (en) * | 2020-12-14 | 2021-05-07 | 复旦大学 | Device and method for collecting and measuring sulfite and nitrite through on-line separation and concentration of atmospheric PM2.5 |
| CN112763278A (en) * | 2020-12-14 | 2021-05-07 | 复旦大学 | System and method for collecting atmospheric aerosol in online concentration mode and conducting temperature and humidity control exposure experiment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111855374A (en) | Medium-flow atmospheric fine particulate concentration device and method | |
| CN111855375B (en) | Online atmospheric fine particulate matter concentrating and collecting device and method | |
| CN111855373B (en) | Device and method for online measurement of trace polar organic matters in atmospheric concentrated particulate matters | |
| CN111855376B (en) | Device and method for measuring online trace water-soluble ions by collecting atmospheric fine particles | |
| CN104280273B (en) | High flow capacity Multifunctional, air colloidal sol turns hydrosol air sampler and the method for sampling | |
| CN212621819U (en) | Medium-flow atmospheric fine particulate concentration device | |
| CN108535168B (en) | Small particle condensation growth counter | |
| CN106680057A (en) | Nano-level particulate matter supersaturated growth device and control method | |
| CN2856967Y (en) | Medium flow air particles sampler | |
| CN206440581U (en) | The dust concentration monitoring device of high-humidity gas fume | |
| CN109381970A (en) | A kind of ammonia processing system and method based on venturi principle | |
| CN112747975A (en) | Device and method for collecting atmospheric fine particulate concentrated solution on line and measuring heavy metal elements | |
| CN212844635U (en) | Online concentration and collection device for atmospheric fine particles | |
| CN104677700B (en) | The sampling system that fine particle gathers a kind of flue gas containing drop suitable for stationary source | |
| CN112747974A (en) | Device and method for collecting atmospheric aerosol and measuring small-molecular organic acid through online concentration | |
| CN112747976A (en) | Online concentration and collection device and method capable of gas-solid separation in medium-flow real atmospheric environment | |
| CN212844636U (en) | Device for online measuring trace water-soluble ions by collecting fine atmospheric particles | |
| CN217211723U (en) | Continuous collection system of atmospheric aerosol liquid phase | |
| CN206515104U (en) | A kind of sampling apparatus for being used to detect perchlorate content in air | |
| CN217211724U (en) | But gas-solid separation's atmosphere pollutant collection system | |
| CN112763277A (en) | System and method for on-line concentration and collection of atmospheric aerosol and oral-nasal exposure | |
| CN204479368U (en) | A kind of sampling system being applicable to stationary source and gathering containing fine particle in drop flue gas | |
| CN107271236B (en) | Core-shell type aerosol generating system and application thereof in preparation of core-shell type aerosol | |
| Berner | The collection of fog droplets by a jet impaction stage | |
| CN112763653A (en) | Device and method for collecting atmospheric fine particulate concentrated solution on line and measuring total toxicity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |