CN113970509A - Multifunctional Environmental Phase State Aerosol Scattering Hygroscopic Growth Factor Monitoring System - Google Patents
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Abstract
The invention relates to a multifunctional environmental phase state aerosol scattering, moisture absorption and growth factor monitoring system, which comprises a sampling head, a primary switching mechanism, a secondary switching mechanism, a connecting pipe, a turbidimeter, a sampling pump, a data acquisition and control module and an acquisition box, wherein the sampling head is connected with the primary switching mechanism; the primary switching mechanism is connected with the sampling head and the connecting pipe; the connecting pipe is connected with the turbidimeter; the turbidimeter is connected with the second-stage switching mechanism, and the second-stage switching mechanism is connected with the sampling pump; a first temperature and humidity probe is arranged between the primary switching mechanism and the sampling head, and a second temperature and humidity probe is arranged on the turbidimeter; the first-stage switching mechanism, the second-stage switching mechanism, the turbidimeter, the first temperature and humidity probe and the second temperature and humidity probe are electrically connected with the data acquisition and control module; the second-stage switching mechanism, the connecting pipe, the turbidimeter, the sampling pump and the data acquisition and control module are all installed in a box body of the acquisition box, and the first-stage switching mechanism and the sampling head are located on the outer side of the acquisition box. The invention has accurate measurement result and belongs to the technical field of environmental monitoring.
Description
Technical Field
The invention relates to the technical field of environmental monitoring, in particular to a multifunctional environmental phase aerosol scattering moisture absorption growth factor monitoring system.
Background
With the increasing pollution of aerosol particles, the physical and chemical characteristics, formation and evolution mechanism of the aerosol particles are hot spots of domestic and foreign research. The phase state of the environmental aerosol particles is an important factor influencing the physicochemical characteristics of the environmental aerosol particles, the gas particle balance of the aerosol particles and heterogeneous chemical reactions. The phase state of the aerosol particles means that the aerosol particles are solid, partially liquid or liquid, and can directly affect the liquid water content of the aerosol particles. In addition, the phase state of the environmental aerosol particles can influence the moisture absorption growth process of the environmental aerosol particles, the moisture absorption growth process of the environmental aerosol particles is closely related to the micro-physical and optical characteristics of the environmental aerosol particles, and the scattering capacity of the moisture absorption grown aerosol particles to sunlight is enhanced, so that the atmospheric visibility is reduced, and the radiation energy balance of a ground gas system is changed.
At present, the moisture absorption growth behavior of aerosol particles is mainly observed by a humidifying double-electron mobility particle size analyzer (HTDMA) and a humidifying turbidimeter system. HTDMA is mainly used for calculating the particle size moisture absorption growth factor of aerosol particles by observing the particle size change of the aerosol particles with a certain particle size before and after humidification. The humidifying turbidimeter system measures the integral scattering coefficient of aerosol particles before and after humidification, and can indirectly reflect the moisture absorption growth behavior of the aerosol.
At present, whether the HTDMA system or the humidifying turbidimeter system is used, aerosol particles are firstly dried to lower relative humidity and then are humidified to certain relative humidity, moisture absorption growth factors are measured, moisture absorption parameters are obtained through inversion, and the environmental effect of the aerosol particles is evaluated on the assumption that the aerosol particles are in a liquid state. However, since the phase state of the aerosol particles is directly related to the relative humidity of the environment, the process of changing with the relative humidity is very complicated, and the observation method of drying first and then humidifying may cause disturbance to the environmental state of the aerosol particles, for example, during the drying process, the environmental aerosol particles may crystallize, the phase state is solid, and then during the humidifying process, the environmental aerosol particles may remain solid until the RH reaches the deliquescent relative humidity thereof, the phase state changes into liquid, or partial deliquescence (partial liquid) at a certain relative humidity may be completely deliquesced at the deliquescent relative humidity; in actual circumstances, if the aerosol particles have not previously crystallized, they are also in a liquid state at ambient relative humidity below their deliquescent relative humidity. On the other hand, even if the ambient aerosol particles are not crystallized during the drying process and the phase state remains liquid, the relative humidity thereof is greatly changed in a short time during the drying and re-humidification process, and the moisture absorption growth factor thereof may deviate from the actual environment under the same relative humidity. This indicates that the current observation method cannot truly reflect the moisture absorption growth behavior of the aerosol particles in the environmental phase state.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to: the multifunctional environmental phase state aerosol scattering, moisture absorption and growth factor monitoring system with accurate measurement results is provided.
In order to achieve the purpose, the invention adopts the following technical scheme:
the multifunctional environmental phase state aerosol scattering moisture absorption growth factor monitoring system comprises a sampling head, a primary switching mechanism, a secondary switching mechanism, a connecting pipe, a turbidimeter, a sampling pump, a data acquisition and control module and an acquisition box;
the one-stage switching mechanism comprises a first electromagnetic valve and a second electromagnetic valve, the first electromagnetic valve and the second electromagnetic valve are both connected with the sampling head through pipelines, and the first electromagnetic valve is connected with the turbidimeter through a pipeline; the second electromagnetic valve is connected with the connecting pipe through a pipeline; the connecting pipe is connected with the inlet end of the turbidimeter; the outlet end of the turbidimeter is connected with a second-stage switching mechanism, and the second-stage switching mechanism is connected with a sampling pump; a first temperature and humidity probe is arranged between the primary switching mechanism and the sampling head, and second temperature and humidity probes are arranged at the inlet end of the turbidimeter, the outlet end of the turbidimeter and the cavity of the turbidimeter; the two-stage switching mechanism, the first electromagnetic valve, the second electromagnetic valve, the turbidimeter, the first temperature and humidity probe and the second temperature and humidity probe are electrically connected with the data acquisition and control module; the second-stage switching mechanism, the connecting pipe, the turbidimeter, the sampling pump and the data acquisition and control module are all installed in a box body of the acquisition box, and the first electromagnetic valve, the second electromagnetic valve and the sampling head are located on the outer side of the acquisition box.
Preferably, the two-stage switching mechanism comprises a third electromagnetic valve, a first flow limiting pipe and a second flow limiting pipe, one end of the third electromagnetic valve is connected with the outlet end of the turbidimeter through a pipeline, the other end of the third electromagnetic valve is connected with the first flow limiting pipe, and the first flow limiting pipe is connected with the sampling pump; one end of the second flow limiting pipe is connected with the outlet end of the turbidimeter, and the other end of the second flow limiting pipe is connected with the sampling pump; the third electromagnetic valve is electrically connected with the data acquisition and control module.
Preferably, the first electromagnetic valve and the second electromagnetic valve are respectively connected with the sampling head through a first three-way pipe, and the first temperature and humidity probe is arranged between the sampling head and the first three-way pipe; the first electromagnetic valve and the connecting pipe are respectively connected with the inlet end of the turbidimeter through a second three-way pipe.
Preferably, when the multifunctional environmental phase aerosol scattering, moisture absorption and growth factor monitoring system is placed outdoors to work, the connecting pipe is a drying pipe, the second electromagnetic valve is connected with one end of the drying pipe through a pipeline, and the other end of the drying pipe is connected with the inlet end of the turbidimeter through a pipeline.
As an optimization, when the multifunctional environment phase state aerosol scattering moisture absorption growth factor monitoring system is placed in indoor work, the connecting pipe is a humidifying pipe, the second electromagnetic valve is connected with one end of the humidifying pipe through a pipeline, and the other end of the humidifying pipe is connected with the inlet end of a turbidimeter through a pipeline.
Preferably, the multifunctional environmental phase aerosol scattering moisture absorption growth factor monitoring system further comprises a rain-proof box, and the first electromagnetic valve and the second electromagnetic valve are both installed in the rain-proof box.
Preferably, the collection box comprises a frame layer, a rain-proof ventilation layer and a bottom layer; the rain-proof ventilation layer and the bottom layer are sequentially connected, and the frame layer is positioned in the rain-proof ventilation layer; the sampling head is positioned at the top of the rainproof ventilation layer; the first electromagnetic valve and the second electromagnetic valve are both arranged on the rainproof ventilation layer, and the connecting pipe is positioned on the rainproof ventilation layer; the turbidimeter is arranged on the frame layer in the rainproof ventilation layer; the data acquisition and control module, the third electromagnetic valve and the sampling pump are arranged on the bottom layer.
Preferably, the rain-proof ventilation layer is a cubic frame and is formed by connecting aluminum profiles, connecting plates are respectively arranged at the top end and the bottom end of the rain-proof ventilation layer, and through holes for pipelines to pass through are formed in the connecting plates at the top end and the connecting plates at the bottom end; the first louver boards are arranged around the rain-proof ventilating layer.
Preferably, the frame layer is a cubic frame, is formed by connecting aluminum profiles and is fixed on a connecting plate at the bottom end of the rainproof ventilating layer through a connecting piece.
Preferably, the bottom layer is a cubic frame, the mounting plates are respectively arranged in the bottom layer and at the bottom end of the bottom layer, the data acquisition and control module, the secondary switching mechanism and the sampling pump are arranged on the mounting plates, and the second louver boards are arranged on the periphery of the bottom layer.
In summary, the present invention has the following advantages:
the invention has accurate measuring result; the device can be placed outdoors, has good rainproof and ventilation effects, and adopts large flow, so that the temperature and the relative humidity of sample gas are basically consistent with the environment; the gas circuit switching is carried out in real time through the primary switching mechanism, so that the measurement of the scattering coefficient of the aerosol particles in a dry state and an environmental state can be realized, the moisture absorption growth factor (f (RH)) in an environmental phase state is calculated, the disturbance of the environmental state of the aerosol particles caused by drying and humidifying is avoided, and the moisture absorption growth behavior of the aerosol can be more accurately evaluated; the temperature and the humidity of the sample gas are monitored in real time in an all-around manner, and data are recorded, so that the later calibration of the data quality is facilitated; the real-time data processing system can be combined to evaluate environmental effects such as the water content of the environmental aerosol particles; the indoor drying gas circuit is connected, so that the function of a single turbidimeter humidifying turbidimeter system can be realized; the PM can be realized by switching the sampling flow in real time through the two-stage switching mechanism2.5And PM10Simultaneous measurement of the scattering moisture absorption growth factor.
Drawings
Fig. 1 is a perspective view of a multifunctional environmental phase aerosol scattering, moisture absorption and growth factor monitoring system with a drying tube as a connecting tube.
Fig. 2 is a perspective view of a multifunctional environmental phase aerosol scattering, moisture absorption and growth factor monitoring system with a humidifying pipe as a connecting pipe.
Fig. 3 is an enlarged view of a portion a in fig. 2.
The system comprises a sampling head, a first temperature and humidity probe, a first electromagnetic valve, a second electromagnetic valve, a drying pipe, a second temperature and humidity probe, a turbidimeter, a third temperature and humidity probe, a fourth temperature and humidity probe, a data acquisition and control module, a third electromagnetic valve, a first flow limiting pipe, a second flow limiting pipe, a sampling pump, a humidifying pipe and a humidifying unit, wherein the sampling head is 1, the first temperature and humidity probe is 2, the first electromagnetic valve is 4, the drying pipe is 5, the second temperature and humidity probe is 6, the turbidimeter is 7, the third temperature and humidity probe is 8, the fourth temperature and humidity probe is 9, the data acquisition and control module is 10, the third electromagnetic valve is 11, the first flow limiting pipe is 12, the second flow limiting pipe is 13, the sampling pump is 14, the humidifying pipe is 15, and the humidifying unit is 16.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Example one
The multifunctional environmental phase state aerosol scattering moisture absorption growth factor monitoring system comprises a sampling head, a primary switching mechanism, a secondary switching mechanism, a connecting pipe, a turbidimeter, a sampling pump, a data acquisition and control module and an acquisition box;
the one-stage switching mechanism comprises a first electromagnetic valve and a second electromagnetic valve, the first electromagnetic valve and the second electromagnetic valve are both connected with the sampling head through pipelines, and the first electromagnetic valve is connected with the turbidimeter through a pipeline; the second electromagnetic valve is connected with the connecting pipe through a pipeline; the connecting pipe is connected with the inlet end of the turbidimeter; the outlet end of the turbidimeter is connected with a second-stage switching mechanism, and the second-stage switching mechanism is connected with a sampling pump; a first temperature and humidity probe is arranged between the primary switching mechanism and the sampling head, and second temperature and humidity probes are arranged at the inlet end of the turbidimeter, the outlet end of the turbidimeter and the cavity of the turbidimeter; the two-stage switching mechanism, the first electromagnetic valve, the second electromagnetic valve, the turbidimeter, the first temperature and humidity probe and the second temperature and humidity probe are electrically connected with the data acquisition and control module; the second-stage switching mechanism, the connecting pipe, the turbidimeter, the sampling pump and the data acquisition and control module are all installed in a box body of the acquisition box, and the first electromagnetic valve, the second electromagnetic valve and the sampling head are located on the outer side of the acquisition box.
The number of the second temperature and humidity probes is three, and the number of the second temperature and humidity probes is threeIn this embodiment, for convenience of distinction, the three second temperature and humidity probes are respectively a second temperature and humidity probe, a third temperature and humidity probe and a fourth temperature and humidity probe; the second warm and humid probe sets up in the entry end of turbidimeter, and the setting of third warm and humid probe is in the cavity of turbidimeter, and the setting of fourth warm and humid probe is at the exit end of turbidimeter. The sampling head adopts PM2.5A cutting head. The sample gas entering the turbidimeter can be controlled to be ambient air or dry gas through the primary switching mechanism. The data acquisition and control module adopts an integrated circuit, can simultaneously read the data of the ten temperature and humidity probes, and can control the on-off of the electromagnetic valve through a relay.
The two-stage switching mechanism comprises a third electromagnetic valve, a first flow limiting pipe and a second flow limiting pipe, one end of the third electromagnetic valve is connected with the outlet end of the turbidimeter through a pipeline, the other end of the third electromagnetic valve is connected with the first flow limiting pipe, and the first flow limiting pipe is connected with the sampling pump; one end of the second flow limiting pipe is connected with the outlet end of the turbidimeter, and the other end of the second flow limiting pipe is connected with the sampling pump; the third electromagnetic valve is electrically connected with the data acquisition and control module. PM can be realized through a two-stage switching mechanism2.5And PM10And simultaneously observing.
The first electromagnetic valve and the second electromagnetic valve are respectively connected with the sampling head through a first three-way pipe, and the first temperature and humidity probe is arranged between the sampling head and the first three-way pipe; the first electromagnetic valve and the connecting pipe are respectively connected with the inlet end of the turbidimeter through a second three-way pipe.
The connecting pipe of this embodiment is the drying tube, and when multi-functional environment looks attitude aerosol scattering moisture absorption growth factor monitoring system placed at outdoor during operation, the connecting pipe is the drying tube, and the second solenoid valve passes through the pipeline to be connected with the one end of drying tube, and the other end of drying tube passes through the pipeline to be connected with the entry end of turbidimeter.
The multifunctional environmental phase aerosol scattering moisture absorption growth factor monitoring system further comprises a rain-proof box, and the first electromagnetic valve and the second electromagnetic valve are both installed in the rain-proof box.
The collection box comprises a frame layer, a rainproof ventilation layer and a bottom layer; the rain-proof ventilation layer and the bottom layer are sequentially connected, and the frame layer is positioned in the rain-proof ventilation layer; the sampling head is positioned at the top of the rainproof ventilation layer; the first electromagnetic valve and the second electromagnetic valve are both arranged on the rainproof ventilation layer, and the connecting pipe is positioned on the rainproof ventilation layer; the turbidimeter is arranged on the frame layer in the rainproof ventilation layer; the data acquisition and control module, the third electromagnetic valve and the sampling pump are arranged on the bottom layer. The rain-proof ventilation layer is a cubic frame and is formed by connecting aluminum profiles, connecting plates are respectively arranged at the top end and the bottom end of the rain-proof ventilation layer, and through holes for pipelines to pass through are formed in the connecting plate at the top end and the connecting plate at the bottom end; the first louver boards are arranged around the rain-proof ventilating layer.
The frame layer is a cubic frame, is formed by connecting aluminum profiles and is fixed on a connecting plate at the bottom end of the rainproof ventilation layer through a connecting piece.
The bottom is cube frame, and the mounting panel is installed respectively to inside and the bottom of bottom, and data acquisition and control module, second grade switching mechanism and sampling pump place at the mounting panel, installs the second shutter plate around the bottom.
In this embodiment, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are all electric ball valves, and the outer surface of the electric ball valve is provided with a rainproof shell (rainproof box); the turbidimeter is an Ecotech Aurora 3000 type three-band total scattering and backscattering turbidimeter, can provide more information and is used for evaluating environmental effects such as the water content of aerosol particles; the drying tube is a Nafion drying tube with the length of 60 cm. The first temperature and humidity probe, the second temperature and humidity probe, the third temperature and humidity probe and the fourth temperature and humidity probe are all Visalak HMP110 and are respectively placed in PM2.5After the cutting head, the entry end of turbidimeter, the cavity of turbidimeter and the exit end of turbidimeter all set up warm and humid probe for to the all-round monitoring of sample gas humiture. The control module controls the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve to be opened and closed, the data acquisition and control module is connected with the turbidimeter, the first temperature and humidity probe, the second temperature and humidity probe, the third temperature and humidity probe and the fourth temperature and humidity probe are connected with the data acquisition and control module, and the environment, the inlet end of the turbidimeter, the outlet end of the turbidimeter and the relative humidity of a turbidimeter cavity are monitored in real time.
In this embodiment, the pipeline between the sampling head and the primary switching mechanism is an air inlet pipeline, and the pipeline between the primary switching mechanism and the turbidimeter is an air inlet pipeline; the pipeline between the turbidimeter and the second-stage switching mechanism is an air outlet pipeline, and the pipeline between the second-stage switching mechanism and the sampling pump is an air outlet pipeline; the air inlet pipelines are all stainless steel pipes, and the air outlet pipelines are Teflon pipes and silica gel hoses;
in order to more accurately obtain the actual sampled relative humidity in the cavity of the turbidimeter, in the embodiment, third temperature and humidity probes are respectively arranged at the inlet end of the turbidimeter, the outlet end of the turbidimeter and the cavity of the turbidimeter, dew points of the inlet end and the outlet end are respectively calculated by utilizing the measured temperature and humidity of the inlet end and the outlet end, the average value of the dew points is regarded as the sampled dew point in the cavity, and the actual sampled relative humidity can be calculated by combining the temperature measured by the temperature and humidity probes arranged in the cavity; the relative humidity of the sampling is compared with the relative humidity of the environment measured by the first temperature and humidity probe behind the cutting head, so that the change of the relative humidity caused by the heating of the cavity of the turbidimeter can be obtained, and the data can be corrected in the later period.
The one-level switching mechanism in this embodiment can control the switching between the environmental gas circuit and the drying gas circuit, thereby realizing the direct measurement of the environmental phase state aerosol scattering moisture absorption growth factor f (rh). By comparing with the observation method of drying before humidifying, the error of the current observation method can be evaluated. Particularly, if the monitoring system is combined with a humidification turbidimeter system, the environmental phase state of aerosol particles can be judged more accurately. In addition, this embodiment can be based on the hygroscopicity, moisture content and the atmospheric visibility of scattering moisture absorption growth factor's observation aassessment environment aerosol particulate matter, carries out more accurate aassessment to environment aerosol particulate matter's environmental effect.
The existing observation means is to dry the aerosol sample gas to measure the scattering coefficient in a dry state, then humidify the aerosol sample gas to the different relative humidity conditions to measure the scattering coefficient in a certain relative humidity condition, and then calculate to obtain the scattering moisture absorption growth factor f (RH). However, since the phase state of the aerosol particles is directly related to the relative humidity of the environment, the process of changing with the relative humidity is very complicated, and the observation method of drying first and then humidifying may cause disturbance to the environmental state of the aerosol particles, for example, during the drying process, the environmental aerosol particles may crystallize, the phase state is solid, and then during the humidifying process, the environmental aerosol particles may remain solid until the RH reaches the deliquescent relative humidity thereof, the phase state changes into liquid, or partial deliquescence (partial liquid) at a certain relative humidity may be completely deliquesced at the deliquescent relative humidity; in actual circumstances, if the aerosol particles have not previously crystallized, they are also in a liquid state at ambient relative humidity below their deliquescent relative humidity. On the other hand, even if the ambient aerosol particles are not crystallized during the drying process and the phase state remains liquid, the relative humidity thereof is greatly changed in a short time during the drying and re-humidification process, and the moisture absorption growth factor thereof may deviate from the actual environment under the same relative humidity. This indicates that the current observation method cannot truly reflect the moisture absorption growth behavior of the aerosol particles in the environmental phase state.
The invention can be placed outdoors, has good rainproof and ventilation effects, and adopts large flow, so that the temperature and the relative humidity of the sample gas are basically consistent with the environment. Through real-time gas circuit switching, the scattering coefficient of the aerosol sample gas in a dry state and an actual environment state is measured, so that the scattering moisture absorption growth factor f (RH) in an environment phase state is calculated, the disturbance of the environment state of aerosol particles caused by drying and humidifying is avoided, and the aerosol moisture absorption growth behavior can be evaluated more accurately.
The two-stage switching mechanism of the embodiment can control the sampling flow according to PM2.5The principle that the cutting particle diameters are different under different flow rates of the cutting head can realize PM through controlling the switching between different sampling flow rates2.5And PM10The scattering coefficients are alternately measured at the same time, so that the PM can be obtained2.5-PM10The contribution of aerosol particles to scattering. Using the PM used in the present embodiment2.5The cutting head is taken as an example, when the sampling flow is 2.5L/min, the cutting grain diameter is PM10When the sampling flow is 8L/min, the cutting particle size is PM2.5. This is achieved byThe flow controlled by the first flow limiting pipe is 2.5L/min, the flow controlled by the second flow limiting pipe is 8L/min, and the switching of two sampling flows is realized by opening and closing the third electromagnetic valve, so that PM is realized2.5And PM10While simultaneously measuring. The PM can be realized by combining the environment gas circuit and the drying gas circuit controlled by the one-stage switching mechanism2.5And PM10And analyzing its environmental effects.
In the embodiment, the multifunctional environmental phase aerosol scattering, moisture absorption and growth factor monitoring system is placed outdoors, and the environmental air passes through PM2.5The cutting head measures the relative humidity of the environment at the temperature and humidity probe and then enters the first-stage switching mechanism through the first three-way pipe. A drying gas circuit is controlled by a first electromagnetic valve of the primary switching mechanism, ambient aerosol particles pass through the drying tube, the relative humidity is reduced to be below 40% or 30%, and the ambient aerosol particles enter a turbidimeter to measure the scattering coefficient (sigma sp, dry) in a dry state; and an environment gas path is controlled by the second electromagnetic valve, and the environment aerosol particles directly enter the turbidimeter without any treatment to measure the scattering coefficient (sigma sp, ambient) under the environment relative humidity. The alternating measurement of sigma sp, dry and sigma sp, ambient is realized by controlling the opening and closing of the first electromagnetic valve and the second electromagnetic valve, one sigma sp, dry measurement and one sigma sp, ambient measurement are taken as a cycle (the time of each measurement is consistent, such as 5 minutes), and the scattering moisture absorption increase factor of the cycle is calculated by using the formula f (RH), wherein the time resolution is 10 minutes. Besides, the sampling flow can be controlled by opening and closing the third electromagnetic valve in the two-stage switching mechanism, so that PM is realized2.5And PM10With a switching time interval of f (rh) measurement period (10 minutes). In addition, the embodiment can also improve the time resolution of the whole system by adding one turbidimeter.
Example two
The connecting pipe of this embodiment is the humidifying pipe, and when multi-functional environment looks attitude aerosol scattering moisture absorption growth factor monitoring system placed at indoor work, the connecting pipe is the humidifying pipe, and the second solenoid valve passes through the pipeline to be connected with the one end of humidifying pipe, and the other end of humidifying pipe passes through the pipeline to be connected with the entry end of turbidimeter.
The general humidification turbidimeter system needs two turbidimeters to realize the measurement of the aerosol scattering moisture absorption growth factor, but the invention can be slightly modified, is connected to an indoor dry gas circuit and is used as a single turbidimeter humidification turbidimeter observation system to realize the measurement of the aerosol scattering moisture absorption growth factor, and the cost can be reduced.
In this embodiment, multi-functional environment phase state aerosol scattering moisture absorption growth factor monitoring system can also place indoor, removes the sampling head, inserts indoor dry gas circuit, changes the drying tube into the humidifying pipe to increase the humidification unit, then this embodiment has the function of single turbidimeter humidification turbidimeter system this moment. Specifically, the gas circuit controlled by the first electromagnetic valve is a dry gas circuit, and the scattering coefficient σ sp, dry in a dry state can be measured by a turbidimeter; the air path controlled by the second electromagnetic valve is a humidifying air path, the dried ambient air is humidified to a certain relative humidity in the humidifying pipe through the humidifying unit, and then the scattering coefficient sigma sp and RH are measured in the turbidimeter. Similarly, the alternating measurement of sigma sp, dry and sigma sp, RH is realized by controlling the opening and closing of the first electromagnetic valve and the second electromagnetic valve, thereby achieving the measurement of the aerosol scattering growth factor, namely realizing the function of a humidification turbidimeter system by using one turbidimeter.
The embodiment is not described in the first embodiment.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
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Cited By (2)
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| CN114878259A (en) * | 2022-05-19 | 2022-08-09 | 中国气象局广州热带海洋气象研究所（广东省气象科学研究所） | Aerosol particle size sampling system |
| CN119246202A (en) * | 2024-09-29 | 2025-01-03 | 暨南大学 | Aerosol thermal desorption device, aerosol thermal desorption system and method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6151953A (en) * | 1998-01-27 | 2000-11-28 | Rupprecht & Patashnick Company, Inc. | Gas stream conditioning apparatus, system and method for use in measuring particulate matter |
| CN1776405A (en) * | 2005-11-18 | 2006-05-24 | 北京大学 | An online atmospheric mercury analyzer |
| CN101949835A (en) * | 2010-08-06 | 2011-01-19 | 北京大学 | On-line aerosol carbon component collecting analyser |
| CN103472035A (en) * | 2013-09-06 | 2013-12-25 | 河北先河环保科技股份有限公司 | Instrument for measuring moisture absorption characteristic and body angle scattering coefficient of atmospheric aerosol |
| CN104792582A (en) * | 2015-05-05 | 2015-07-22 | 青岛精益信电子技术有限公司 | Pollution source fine particulate matter dilution sampling method and device |
| CN105203434A (en) * | 2015-09-02 | 2015-12-30 | 清华大学 | Particle size spectrometer measuring water content of aerosol |
| CN105928846A (en) * | 2016-05-20 | 2016-09-07 | 北京大学 | Measuring system and measuring method of aerosol scattering and moisture absorbing growth factors |
| CN109351099A (en) * | 2018-12-06 | 2019-02-19 | 江苏纵湖涂装设备产业研究院有限公司 | A kind of coating waste gas processor of adjustable exhaust gas flow |
| CN109541141A (en) * | 2018-11-27 | 2019-03-29 | 汇众翔环保科技股份有限公司 | A kind of small air mass monitoring system and analysis method |
| CN110132804A (en) * | 2019-06-13 | 2019-08-16 | 中国科学院合肥物质科学研究院 | A system and method for measuring the hygroscopicity of nano aerosols |
-
2021
- 2021-11-03 CN CN202111291702.6A patent/CN113970509A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6151953A (en) * | 1998-01-27 | 2000-11-28 | Rupprecht & Patashnick Company, Inc. | Gas stream conditioning apparatus, system and method for use in measuring particulate matter |
| CN1776405A (en) * | 2005-11-18 | 2006-05-24 | 北京大学 | An online atmospheric mercury analyzer |
| CN101949835A (en) * | 2010-08-06 | 2011-01-19 | 北京大学 | On-line aerosol carbon component collecting analyser |
| CN103472035A (en) * | 2013-09-06 | 2013-12-25 | 河北先河环保科技股份有限公司 | Instrument for measuring moisture absorption characteristic and body angle scattering coefficient of atmospheric aerosol |
| CN104792582A (en) * | 2015-05-05 | 2015-07-22 | 青岛精益信电子技术有限公司 | Pollution source fine particulate matter dilution sampling method and device |
| CN105203434A (en) * | 2015-09-02 | 2015-12-30 | 清华大学 | Particle size spectrometer measuring water content of aerosol |
| CN105928846A (en) * | 2016-05-20 | 2016-09-07 | 北京大学 | Measuring system and measuring method of aerosol scattering and moisture absorbing growth factors |
| CN109541141A (en) * | 2018-11-27 | 2019-03-29 | 汇众翔环保科技股份有限公司 | A kind of small air mass monitoring system and analysis method |
| CN109351099A (en) * | 2018-12-06 | 2019-02-19 | 江苏纵湖涂装设备产业研究院有限公司 | A kind of coating waste gas processor of adjustable exhaust gas flow |
| CN110132804A (en) * | 2019-06-13 | 2019-08-16 | 中国科学院合肥物质科学研究院 | A system and method for measuring the hygroscopicity of nano aerosols |
Non-Patent Citations (2)
| Title |
|---|
| H. GUO ET AL.: "Fine-particle water and pH in the southeastern United States", vol. 15, pages 5211 - 5228 * |
| 张阳;张元勋;刘红杰;王羽琴;邓建国;胡敏;: "大气颗粒物采样器的设计与应用", no. 01, pages 181 - 185 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114878259A (en) * | 2022-05-19 | 2022-08-09 | 中国气象局广州热带海洋气象研究所（广东省气象科学研究所） | Aerosol particle size sampling system |
| CN119246202A (en) * | 2024-09-29 | 2025-01-03 | 暨南大学 | Aerosol thermal desorption device, aerosol thermal desorption system and method |
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