CN114152713A - Device and method for collecting and detecting gaseous and granular heavy metals of fixed pollution source - Google Patents
Device and method for collecting and detecting gaseous and granular heavy metals of fixed pollution source Download PDFInfo
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- CN114152713A CN114152713A CN202111339674.0A CN202111339674A CN114152713A CN 114152713 A CN114152713 A CN 114152713A CN 202111339674 A CN202111339674 A CN 202111339674A CN 114152713 A CN114152713 A CN 114152713A
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000010881 fly ash Substances 0.000 claims abstract description 48
- 238000005070 sampling Methods 0.000 claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 239000002956 ash Substances 0.000 claims abstract description 18
- 239000003546 flue gas Substances 0.000 claims description 38
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 35
- 239000002245 particle Substances 0.000 claims description 35
- 239000010453 quartz Substances 0.000 claims description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 24
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 239000012528 membrane Substances 0.000 abstract description 3
- 238000013508 migration Methods 0.000 abstract description 3
- 230000005012 migration Effects 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 abstract 3
- 235000017491 Bambusa tulda Nutrition 0.000 abstract 3
- 241001330002 Bambuseae Species 0.000 abstract 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 abstract 3
- 239000011425 bamboo Substances 0.000 abstract 3
- 239000003245 coal Substances 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 7
- 229910052785 arsenic Inorganic materials 0.000 description 6
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 6
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 6
- 229910052753 mercury Inorganic materials 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
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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
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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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
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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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
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
- G01N2001/1418—Depression, aspiration
- G01N2001/1427—Positive displacement, piston, peristaltic
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- General Health & Medical Sciences (AREA)
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Abstract
A device and a method for collecting and detecting gaseous and granular heavy metals of a fixed pollution source. In the prior art, the problem of adsorption of the fly ash isolated by the filter membrane on gaseous heavy metals exists, and the accurate recognition of heavy metal migration, transformation and control rules is influenced by the distortion of basic data. The invention comprises the following components: convex sampling mouth (1), convex sampling mouth top is connected with cyclone (3), its below is connected with coarse ash storehouse (2), the one end of P type connecting bend (4) has been inserted at the cyclone top, the P type connecting bend other end is strained a section of thick bamboo (6) with quartzy and is connected, quartzy section of thick bamboo internally mounted has filter mantle (5), quartzy section of thick bamboo is strained and is connected with rotary vane vacuum pump (7) through the pipeline, rotary vane vacuum pump passes through pipeline and mass flow meter (8), mass flow meter passes through the pipeline and is connected with gas-liquid contact ball (10), the lower part at striking bottle (9) is installed to gas-liquid contact ball. The invention is used for collecting and detecting the gaseous and granular heavy metals of the fixed pollution source.
Description
Technical Field
The invention relates to the technical field of environmental monitoring and analysis of fixed pollution sources, in particular to a device and a method for collecting and detecting gaseous and granular heavy metals of fixed pollution sources.
Background
Heavy metals arsenic, mercury and the like can cause serious threats to the ecological environment such as water, atmosphere, soil and the like, the ecological environment and the human health are influenced, a great deal of research work is carried out by people aiming at the emission, migration, conversion, sedimentation and control of related heavy metals and compounds thereof, arsenic and mercury are toxic heavy metal elements with high volatility widely existing in coal, a great amount of coal combustion in China is one of main artificial emission sources of arsenic and mercury, so that the control of the emission of heavy metals in the coal combustion process is of great importance, the harmful element content classification in GB20475 coal carries out strict classification on arsenic and mercury, the coal used for a GB7562 power generation pulverized coal boiler also carries out use limitation on the arsenic and mercury contents, the heavy metals such as arsenic, mercury and the like are separated out in a high-temperature area in the coal combustion process, are easy to be adsorbed on fly ash particles along with the cooling and cooling of flue gas, the occurrence state comprises a gaseous state and a particle state, and the heavy metal fly ash is easy to be adsorbed on the fly ash, in the sample collection process, the adsorption of a large amount of gaseous heavy metals on fly ash is difficult to avoid, so that the concentration of the gaseous heavy metals monitored by a fixed pollution source is lower than that of the particulate heavy metals;
at present, an environment-friendly monitoring system capable of effectively preventing fly ash from adsorbing heavy metals is not available at home and abroad, and some documents and patents propose a method for removing fly ash by filter membrane isolation, but related devices have the problem of adsorption of fly ash isolated by filter membranes on gaseous heavy metals, and the correct recognition of heavy metal migration, transformation and control rules is influenced by the distortion of basic data. Therefore, a monitoring system for the concentration of the heavy metal in a fixed pollution source gas state and a particle state is urgently needed to be developed to solve the problems; based on the analysis, no scheme for solving the problem of data distortion of monitoring of the gaseous and granular heavy metals of the fixed pollution source exists in the prior art.
Disclosure of Invention
The invention aims to provide a device and a method for collecting and detecting gaseous and granular heavy metals of a fixed pollution source.
The above purpose is realized by the following technical scheme:
the utility model provides a detection device is gathered to fixed pollution sources gaseous state and particulate heavy metal, its constitution includes: the device comprises a convex sampling nozzle, wherein the upper part of the convex sampling nozzle is connected with a cyclone separator, the lower part of the convex sampling nozzle is connected with a coarse ash bin, one end of a P-shaped connecting elbow is inserted into the top of the cyclone separator, the other end of the P-shaped connecting elbow is connected with a quartz filter cylinder, a filter cover is arranged inside the quartz filter cylinder, the quartz filter cylinder is connected with a rotary vane vacuum pump through a pipeline, the rotary vane vacuum pump is connected with a mass flow meter through a pipeline, the mass flow meter is connected with a gas-liquid contact ball through a pipeline, and the gas-liquid contact ball is arranged on the lower part of an impact bottle.
Fixed pollution source gaseous state and granular state heavy metal gather detection device, striking bottle top install the gas vent, the outside toper that is of convex sampling mouth, its inside cylindrical passage structure that is, P type connecting bend be the curved streamline structure of semicircle, the spherical surface of gas-liquid contact a set of round hole has to evenly arrange.
The device for collecting and detecting the gaseous and granular heavy metals of the fixed pollution source comprises a convex sampling nozzle, a cyclone separator, a P-shaped connecting bent pipe and a quartz filter cylinder which are fixed inside a source flue wall.
A device and a method for collecting and detecting gaseous and granular heavy metals of a fixed pollution source comprise the following steps:
firstly, flue gas in a cyclone separator enters at a constant speed, the lower end of the cyclone separator is connected with a coarse ash bin which is used for cutting off large-particle fly ash, namely, the large-particle fly ash rotationally sinks under the action of centrifugal force and gravity and enters the coarse ash bin, one end of a P-shaped connecting bent pipe is inserted into the cyclone separator, the other end of the P-shaped connecting bent pipe is connected with a quartz filter cylinder for filtering small-particle fly ash, a convex sampling nozzle is matched with the size of the inner diameter according to the flow rate of the flue gas and the size specification of the inner diameter, constant-speed sampling is ensured, the selection is carried out according to the calculation result of the convex sampling nozzle, the cyclone separator, the P-shaped connecting bent pipe, the quartz filter cylinder and a filter cover are fixed in the source flue wall, the large-particle fly ash and the small-particle fly ash are ensured to be representative, and an impact bottle is filled with hydrogen peroxide and nitric acid solution with specified concentration and reacts with gaseous heavy metals in the flue gas for absorption;
the inner diameter D of the convex sampling nozzle is selected according to the formula:
wherein Q isSFor sample collection flow, VSCollecting the flow rate for the sample;
wherein, KPCorrection factor for pitot tube, P, for speed measurementa、PdRespectively dynamic and static pressure, M, of the flue gasSTo fix the source flue gas molecular weight, TSFor fixing the source flue gas temperature, BaIs at atmospheric pressure;
the convex sampling nozzle vertically faces the flow direction of the flue gas, the flue gas from the fixed source enters the cyclone separator at a constant speed, large-particle fly ash in the flue gas rotationally sinks under the action of centrifugal force and gravity and enters the coarse ash bin, and the mass of a large-particle fly ash sample collected by the coarse ash bin is M1 and is used for analyzing the content of heavy metal in the fly ash;
the flue gas without large particle fly ash enters a P-type connecting bent pipe and enters a quartz filter cylinder to filter small particle fly ash, and the mass of the flue gas serving as a heavy metal content analysis sample is M2 and the flue gas is used for heavy metal content analysis in fly ash.
Has the advantages that:
1. the invention relates to a device and a method for collecting and detecting gaseous and granular heavy metals of a fixed pollution source.
The system has the two-stage fly ash filtering function, can efficiently separate gaseous and granular heavy metal samples of the fixed pollution source, avoids monitoring data distortion caused by adsorption of a large amount of gaseous heavy metals on fly ash, improves the representativeness and reliability of the monitoring data of the heavy metals in different forms of the fixed pollution source, is a stable system for monitoring the gaseous and granular heavy metals of the fixed pollution source, and has the advantage of high accuracy.
The P-shaped connecting bend adopts a semicircular bent flow line structure, aims to prevent coalescence or spalling of small fly ash particles, filters the small fly ash particles through the quartz filter cylinder connected with the other end and the built-in filter cover to serve as a sample for analyzing the content of heavy metal, and has simple and practical structure.
The gas-liquid contact ball is provided with the plurality of round holes which are uniformly arranged, the structure can increase the mass transfer of the flue gas and the solution, ensure the full reaction of the heavy metal in the flue gas and the absorption liquid, arrange the leaf vacuum pump close to the front to extract a fixed source sample, and prevent the fixed source from causing liquid backflow suck-back due to negative pressure.
The thin wall of the air inlet of the convex sampling nozzle is adopted, so that the disturbance of flue gas disorder can be avoided, and the sampling representativeness is ensured.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the convex sampling nozzle of fig. 1.
Wherein: 1. the device comprises a convex sampling nozzle, 2, a coarse ash bin, 3, a cyclone separator, 4, a P-shaped connecting bent pipe, 5, a filter cover, 6, a quartz filter cylinder, 7, a rotary vane vacuum pump, 8, a mass flowmeter, 9, an impact bottle, 10, a gas-liquid contact ball, 11, an exhaust port, 12 and a flue wall.
The specific implementation mode is as follows:
example 1:
the utility model provides a detection device is gathered to fixed pollution sources gaseous state and particulate heavy metal, its constitution includes: the device comprises a convex sampling nozzle 1, wherein the upper part of the convex sampling nozzle is connected with a cyclone separator 3, the lower part of the convex sampling nozzle is connected with a coarse ash bin 2, one end of a P-shaped connecting bent pipe 4 is inserted into the top of the cyclone separator, the other end of the P-shaped connecting bent pipe is connected with a quartz filter cylinder 6, a filter cover 5 is arranged inside the quartz filter cylinder, the quartz filter cylinder is connected with a rotary vane vacuum pump 7 through a pipeline, the rotary vane vacuum pump is connected with a mass flow meter 8 through a pipeline, the mass flow meter is connected with a gas-liquid contact ball 10 through a pipeline, and the gas-liquid contact ball is arranged on the lower part of an impact bottle 9.
Example 2:
according to embodiment 1 fixed pollution sources gaseous state and particulate heavy metal gather detection device, striking bottle top install gas vent 11, the outside toper that is of convex sampling mouth, its inside cylindrical passage structure that is, P type connecting bend be the curved streamline structure of semicircle, the spherical outer surface of gas-liquid contact a set of round hole has to evenly arrange.
Example 3:
according to the device for collecting and detecting the gaseous and particulate heavy metals of the fixed pollution source in the embodiment 2, the convex sampling nozzle, the cyclone separator, the P-shaped connecting elbow and the quartz filter cylinder are fixed inside the source flue wall 12.
Example 4:
the detection method of the device for collecting and detecting the heavy metals in the gaseous state and the particulate state of the fixed pollution source according to the embodiments 1-3 comprises the following steps:
firstly, flue gas in a cyclone separator enters at a constant speed, the lower end of the cyclone separator is connected with a coarse ash bin which is used for cutting off large-particle fly ash, namely, the large-particle fly ash rotationally sinks under the action of centrifugal force and gravity and enters the coarse ash bin, one end of a P-shaped connecting bent pipe is inserted into the cyclone separator, the other end of the P-shaped connecting bent pipe is connected with a quartz filter cylinder for filtering small-particle fly ash, a convex sampling nozzle is matched with the size of the inner diameter according to the flow rate of the flue gas and the size specification of the inner diameter, constant-speed sampling is ensured, the selection is carried out according to the calculation result of the convex sampling nozzle, the cyclone separator, the P-shaped connecting bent pipe, the quartz filter cylinder and a filter cover are fixed in the source flue wall, the large-particle fly ash and the small-particle fly ash are ensured to be representative, and an impact bottle is filled with hydrogen peroxide and nitric acid solution with specified concentration and reacts with gaseous heavy metals in the flue gas for absorption;
the inner diameter D of the convex sampling nozzle is selected according to the formula:
wherein Q isSFor sample collection flow, VSCollecting the flow rate for the sample;
wherein, KPCorrection factor for pitot tube, P, for speed measurementa、PdRespectively dynamic and static pressure, M, of the flue gasSTo fix the source flue gas molecular weight, TSFor fixing the source flue gas temperature, BaIs at atmospheric pressure;
the convex sampling nozzle vertically faces the flow direction of the flue gas, the flue gas from the fixed source enters the cyclone separator at a constant speed, large-particle fly ash in the flue gas rotationally sinks under the action of centrifugal force and gravity and enters the coarse ash bin, and the mass of a large-particle fly ash sample collected by the coarse ash bin is M1 and is used for analyzing the content of heavy metal in the fly ash;
the flue gas from which the large-particle fly ash is removed enters a P-type connecting bent pipe and enters a quartz filter cylinder to filter the small-particle fly ash, and the mass of the small-particle fly ash as a heavy metal content analysis sample is M2 and is used for analyzing the heavy metal content in the fly ash;
mass flow meter corrects sample volume to standard V for recorded temperature and pressure valuesb；
The content of particulate heavy metals was calculated using the following formula:
wherein H1 is the heavy metal content in large-particle fly ash, H2 is the heavy metal content in small-particle fly ash;
the gaseous heavy metal content was calculated using the following formula:
wherein V is the volume of the absorption liquid in the impact bottle, and y is the heavy metal content of the absorption liquid; vbSample volume to standard state.
Claims (4)
1. The utility model provides a detection device is gathered to fixed pollution sources gaseous state and particulate heavy metal, its constitution includes: convex sampling mouth, characterized by: the device comprises a convex sampling nozzle, a cyclone separator, a coarse ash bin, a P-shaped connecting elbow, a quartz filter cylinder, a filter cover, a rotary vane vacuum pump, a mass flow meter, a gas-liquid contact ball and a gas-liquid contact ball, wherein the upper part of the convex sampling nozzle is connected with the cyclone separator, the lower part of the convex sampling nozzle is connected with the coarse ash bin, one end of the P-shaped connecting elbow is inserted into the top of the cyclone separator, the other end of the P-shaped connecting elbow is connected with the quartz filter cylinder, the filter cover is arranged inside the quartz filter cylinder, the quartz filter cylinder is connected with the rotary vane vacuum pump through a pipeline, the rotary vane vacuum pump is connected with the mass flow meter through a pipeline, the mass flow meter is connected with the gas-liquid contact ball through a pipeline, and the gas-liquid contact ball is arranged on the lower part of an impact bottle.
2. The device for collecting and detecting the gaseous and granular heavy metals in the fixed pollution source according to claim 1, which is characterized in that: striking bottle top install the gas vent, convex sampling mouth outside be the toper, its inside cylindrical passage structure that is, P type connecting bend be the curved streamline structure of semicircle, the gas-liquid contact ball outer surface a set of round hole has to evenly arrange.
3. The device for collecting and detecting the heavy metals in the fixed pollution source gaseous state and the particulate state as claimed in claim 2, wherein: the convex sampling nozzle, the cyclone separator, the P-shaped connecting bent pipe and the quartz filter cylinder are fixed inside the source flue wall.
4. The device and the method for collecting and detecting the gaseous and granular heavy metals in the fixed pollution source according to one of the claims 1 to 3, wherein the device comprises: the method comprises the following steps:
firstly, flue gas in a cyclone separator enters at a constant speed, the lower end of the cyclone separator is connected with a coarse ash bin which is used for cutting off large-particle fly ash, namely, the large-particle fly ash rotationally sinks under the action of centrifugal force and gravity and enters the coarse ash bin, one end of a P-shaped connecting bent pipe is inserted into the cyclone separator, the other end of the P-shaped connecting bent pipe is connected with a quartz filter cylinder for filtering small-particle fly ash, a convex sampling nozzle is matched with the size of the inner diameter according to the flow rate of the flue gas and the size specification of the inner diameter, constant-speed sampling is ensured, the selection is carried out according to the calculation result of the convex sampling nozzle, the cyclone separator, the P-shaped connecting bent pipe, the quartz filter cylinder and a filter cover are fixed in the source flue wall, the large-particle fly ash and the small-particle fly ash are ensured to be representative, and an impact bottle is filled with hydrogen peroxide and nitric acid solution with specified concentration and reacts with gaseous heavy metals in the flue gas for absorption;
the inner diameter D of the convex sampling nozzle is selected according to the formula:
wherein Q isSFor sample collection flow, VSCollecting the flow rate for the sample;
wherein, KPCorrection factor for pitot tube, P, for speed measurementa、PdRespectively dynamic and static pressure, M, of the flue gasSTo fix the source flue gas molecular weight, TSFor fixing the source flue gas temperature, BaIs at atmospheric pressure;
the convex sampling nozzle vertically faces the flow direction of the flue gas, the flue gas from the fixed source enters the cyclone separator at a constant speed, large-particle fly ash in the flue gas rotationally sinks under the action of centrifugal force and gravity and enters the coarse ash bin, and the mass of a large-particle fly ash sample collected by the coarse ash bin is M1 and is used for analyzing the content of heavy metal in the fly ash;
the flue gas without large particle fly ash enters a P-type connecting bent pipe and enters a quartz filter cylinder to filter small particle fly ash, and the mass of the flue gas serving as a heavy metal content analysis sample is M2 and the flue gas is used for heavy metal content analysis in fly ash.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115406726A (en) * | 2022-10-26 | 2022-11-29 | 北京慧荣和科技有限公司 | Air aerosol sampler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115406726A (en) * | 2022-10-26 | 2022-11-29 | 北京慧荣和科技有限公司 | Air aerosol sampler |
| CN115406726B (en) * | 2022-10-26 | 2023-01-31 | 北京慧荣和科技有限公司 | Air aerosol sampler |
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