An offline portable atmospheric pollutant sampling device

Abstract

The utility model belongs to the atmospheric environment monitoring technical field, concretely is a kind of off-line portable atmospheric pollutant sampling device.The utility model device includes:PM 2.5 Whirl cutting head is used to cut the atmospheric particulate matter with diameter greater than 2.5 μm;Particulate matter collection room is used to collect the atmospheric particulate matter with diameter less than PM 2.5 Organic pollutant collection room is used to collect the intermediate / semi-volatile persistent organic pollutant in the gas remaining after being trapped by filter membrane;Air pump is used to provide power.The device is designed integrally, small in size, light in weight;It can complete the synchronous sampling and enrichment of PM 2.5 And volatile organic pollutant at a time, greatly improve the efficiency of on-site work and the time consistency of data;And can keep stable sampling flow and cutting performance under complex environment, ensure sampling accuracy;It can be flexibly arranged in the unique microenvironment that various fixed sites such as fire scene, traffic hub cannot cover, accurately assess the real pollutant exposure level of individual.

Description

Technical Field

[0001] This utility model belongs to the field of atmospheric environment monitoring technology, specifically relating to an offline portable atmospheric pollutant sampling device. Background Technology

[0002] Atmospheric particulate matter sampling is a fundamental step in environmental monitoring, health risk assessment, and human exposure studies. Its accuracy and portability directly impact product quality control and particulate matter collection efficiency. Traditional sampling methods typically require two separate and bulky devices—a particulate matter sampler and a VOCs sampler. These separate devices make it difficult to guarantee absolute consistency in sampling time, location, and meteorological conditions, leading to inconsistent PM2.5 data. 2.5 Not only do atmospheric particulate matter (NPM) and VOCs data differ in temporal resolution, but significant wall losses also exist, introducing uncertainties for subsequent research on synergistic effects and source apportionment. Furthermore, traditional standard sampling equipment is mostly designed as fixed stations or in laboratories, making it large, heavy, and requiring external mains power. This hinders its mobility, making it difficult to follow human movement for individual exposure assessments, and it cannot be flexibly deployed in specific micro-environments such as fire scenes, garages, or indoor spaces. This results in spatial blind spots in monitoring data, making it impossible to accurately assess the actual exposure concentrations of populations in real-life situations. Therefore, developing an atmospheric particulate matter sampling device that combines low cost, high precision, and portability has become an inevitable trend and a core breakthrough in the fields of atmospheric environmental monitoring, exposure science, and occupational health. Summary of the Invention

[0003] The purpose of this invention is to provide an offline portable atmospheric pollutant sampling device with strong anti-interference ability and high sampling accuracy, so as to solve the technical bottlenecks of serious wall loss, overall pipeline leakage and high equipment cost in traditional methods.

[0004] The offline portable air pollutant sampling device provided by this utility model mainly consists of PM 2.5 The cyclone cutting head 1, particulate matter collection chamber 2, persistent organic pollutant collection chamber 3, and portable air intake pump 4 are connected by pipelines; wherein:

[0005] The PM 2.5The cyclone cutting head is used to cut atmospheric particles with an aerodynamic diameter greater than 2.5 μm. Specifically, it includes a cyclone cutting chamber 6, which consists of a set of shaped blades (also called cyclone segments) fixed to the inner wall of the cyclone cutting head. Below this chamber is a dust collection bin or dust removal device 8. An air inlet 5 is located on the side of the cutting head, and an exhaust outlet 7 is located above. During operation, the air pump starts, generating negative pressure. Under this negative pressure, the gas to be cut is drawn into the air inlet 5 on the side of the cutting head and enters the cyclone cutting chamber through a pipeline. The dust-laden airflow enters from the air inlet 5 along the tangential direction of the blade set inside the cyclone cutting chamber, forming a high-speed rotating vortex. During this high-speed rotation, dust particles with a density much greater than air are thrown towards the inner wall of the cyclone cutter under centrifugal force. The particles collide with the inner wall, lose kinetic energy, and slide down the wall under gravity, falling into the dust collection bin connected below, thus separating particles larger than PM2.5. 2.5 The fine particulate matter is discharged from the exhaust port 7 along with the cyclone.

[0006] PM 2.5 The cyclone cutting head is made of aluminum alloy with a Teflon coating. This coating prevents the adsorption and residue of particulate matter, especially sticky and oily particles, and significantly reduces the premature adsorption of organic aerosols in dusty gases.

[0007] The particulate matter collection chamber is used to collect particles with an aerodynamic diameter smaller than PM2.5. 2.5 The atmospheric particulate matter includes a shell, a quartz filter membrane and a stainless steel filter screen fixed inside the shell, wherein the quartz filter membrane and the stainless steel filter screen are fixed between the upper sample inlet cover 9 and the lower membrane holder 10; this can greatly increase the stability of the filter membrane placement and reduce particulate matter loss caused by the unstable position of the filter membrane.

[0008] The filter membrane and stainless steel filter screen are sandwiched between the sample inlet cover and the membrane holder, with the inner and outer diameter error set to 0-0.14mm. This ensures that the two metal products are tightly connected while preventing air leakage.

[0009] Stainless steel filter mesh and quartz filter membrane have excellent chemical inertness and do not readily react with particulate matter, making them suitable for adsorbing and collecting PM2.5. 2.5 While producing microparticles, it can greatly reduce the chemical loss of organic aerosols.

[0010] In the particulate matter collection chamber, the outer shell, sample inlet cover, and membrane holder are all made of aluminum alloy and the surface is sandblasted and oxidized to ensure that the entire sampling device is not corroded by the collected pollutants.

[0011] The persistent organic pollutant collection chamber is used to collect intermediate / semi-volatile persistent organic pollutants in the remaining gas after being captured by the filter membrane; the organic pollutant collection chamber is filled with a high-purity polyurethane foam (PUF) adsorbent, which can adsorb VOCs and the like.

[0012] The exterior of the collection chamber is made of aluminum alloy, and the surface is sandblasted and oxidized to ensure that the entire sampling device is not corroded by the collected pollutants.

[0013] Generally, the organic pollutant collection chamber is cylindrical, with the internal adsorbent having a length of 70-80 mm and a diameter of 60-70 mm. The organic pollutant collection chamber can also be rectangular, etc.

[0014] In this utility model, in PM 2.5 At the connection between the cyclone cutting head 1, the particulate matter collection chamber 2, and the persistent organic pollutant collection chamber 3, gaskets and raw material tape are installed to enhance the sealing of the device.

[0015] In this invention, when the device is working, the gas flow rate is controlled so that the device continuously samples for one hour, and the cumulative gas collection volume is exactly 1m³. 3 In this embodiment, the gas flow rate is specifically controlled at 16.7 L / min.

[0016] The main advantages of this utility model are:

[0017] This utility model device achieves PM functionality on an offline portable device through an integrated design. 2.5 This device enables simultaneous, high-precision sampling of VOCs, accurately capturing individual exposure levels in real-world microenvironments that are inaccessible by traditional methods. Its compact size and lightweight design allow for simultaneous sampling and enrichment of PM2.5 and volatile organic pollutants in a single operation, significantly improving field efficiency and data consistency. The robust structure and strong anti-interference capabilities ensure stable sampling flow and cutting performance in complex environments, guaranteeing sampling accuracy. Its portability and stability allow for flexible deployment in various unique microenvironments that traditional fixed sites cannot cover, such as fire scenes, underground garages, gyms, newly renovated homes, and transportation hubs, accurately assessing individuals' true pollutant exposure levels. This device provides a powerful technical tool for research in environmental health, occupational health, and exposure science, effectively advancing studies on the pollutant exposure characteristics, health risks, and influencing factors of specific populations in different environments. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the portable air pollutant sampling device of this utility model.

[0019] Figure 2 PM in this utility model2.5 Diagram of the cyclone cutting head structure.

[0020] Figure 3 This is a structural diagram of the particulate matter collection chamber in this utility model.

[0021] The number 1 in the diagram represents PM. 2.5 1. Cyclone cutting head; 2. Particulate matter collection chamber; 3. Organic pollutant collection chamber; 4. Portable air pump; 5. Air inlet; 6. Cyclone cutting chamber; 7. Fine particulate matter exhaust port; 8. Dust collection bin; 9. Sample inlet cover; 10. Membrane holder. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Example 1: See Figure 2 Includes: PM 2.5 Cyclone cutting head 1, particulate matter collection chamber 2, persistent organic pollutant collection chamber 3, SKC-QT-30 portable air intake pump 4.

[0024] PM 2.5 The cyclone cutting head 1 is an aluminum alloy cutting head with a Teflon coating on its surface.

[0025] The particulate matter collection chamber 2 is an aluminum alloy product with a sandblasted and oxidized surface. It contains a quartz filter membrane with a diameter of 47 mm and a stainless steel filter screen with a diameter of 47 mm.

[0026] An aluminum alloy product with a sandblasted and oxidized surface contains a collection chamber for intermediate / semi-volatile persistent organic pollutants, which contains high-purity polyurethane foam (PUF) with a length of 75 mm and a diameter of 63.5 mm.

[0027] The portable sampling pump uses a portable air intake pump of model SKC-QT-30.

[0028] The steps are as follows:

[0029] Step 1: On the membrane holder inside the particulate matter collection chamber 2, from bottom to top, use sterilized stainless steel tweezers to install a 47mm diameter stainless steel filter screen, followed by a 47mm diameter quartz filter membrane.

[0030] Step 2: In the persistent organic pollutant collection chamber 3, two high-purity polyurethane foam (PUF) with a length of 75 mm and a diameter of 63.5 mm are sequentially placed in the chamber from top to bottom.

[0031] Step 3: In PM 2.5At the connection points of the cyclone cutting head 1, the particulate matter collection chamber 2, and the persistent organic pollutant collection chamber 3, install graphite gaskets of appropriate sizes and wrapping raw material tape;

[0032] Step 4: Connect the lower end of the persistent organic pollutant collection chamber 3 to the air inlet of the portable sampling pump 4 via a PU material hose;

[0033] Step 5: Turn on the portable sampling pump 4 and start sampling.

[0034] The specific controlled gas flow rate is 16.7 L / min, and the device continuously samples for one hour, with a cumulative gas collection volume of 1 m³. 3 .

[0035] To check the overall sealing performance of the device, its overall sealing performance was verified bidirectionally by vacuum flow measurement and air blowing methods.

[0036] The vacuum flow measurement method involves blocking the air inlet at the front of the device and connecting a high-precision flow meter between the sampling pump and the sampling device to measure the flow rate. Under negative pressure, the flow meter display is observed on the control screen. When the gas flow rate approaches zero (approximately 0.1 L / min), it indicates good airtightness. The second method involves placing the sampler in water under positive pressure. The results show that, with the sampling pump operating normally, sealing the PM2.5 sampler... 2.5 After the air inlet of the cyclone cutting head, almost no small bubbles were observed to emerge from the device connection, proving that its airtightness is good.

Claims

1. An offline portable air pollutant sampling device, characterized in that, By PM 2.5 The system consists of a cyclone cutting head, a particulate matter collection chamber, a persistent organic pollutant collection chamber, and a portable air intake pump connected by pipelines; wherein: The PM 2.5 A cyclone cutting head is used to cut atmospheric particles with an aerodynamic diameter greater than 2.5 μm. Specifically, it includes a cyclone cutting chamber, in which a set of blades, also known as cyclone blades, are fixed to the inner wall of the cyclone cutting chamber, and a dust collection bin or ash removal device is located below it. An air inlet is provided on the side of the cutting head, and an exhaust port is provided on the top. The particulate matter collection chamber is used to collect particles with an aerodynamic diameter smaller than PM2.

5. 2.5 Atmospheric particulate matter; specifically including an outer shell, a quartz filter membrane and a stainless steel filter screen fixed inside the outer shell, the quartz filter membrane and the stainless steel filter screen being fixed between the upper sample inlet cover and the lower membrane holder; The persistent organic pollutant collection chamber is used to collect intermediate / semi-volatile persistent organic pollutants in the remaining gas after being captured by the filter membrane; the organic pollutant collection chamber is filled with a high-purity polyurethane foam adsorbent for adsorbing VOCs.

2. The offline portable air pollutant sampling device according to claim 1, characterized in that, The PM 2.5 In the cyclone cutting head, when the air pump starts, a negative pressure is generated. Under this negative pressure, the gas to be cut is drawn into the air inlet on the side of the cutting head and enters the cyclone cutting chamber through the pipeline. The dust-laden airflow enters from the air inlet along the tangential direction of the blade assembly inside the cyclone cutting chamber, forming a high-speed rotating vortex. During this high-speed rotation, dust particles, which are much denser than air, are thrown towards the inner wall of the cyclone cutter under the action of centrifugal force. After colliding with the inner wall and losing kinetic energy, the particles slide down the wall under the action of gravity and fall into the dust collection bin connected below, thus achieving the separation of particles larger than PM2.

5. 2.5 The air circulates through the exhaust port, while fine particulate matter is expelled along with the air cyclone.

3. The offline portable air pollutant sampling device according to claim 1, characterized in that, In the particulate matter collection chamber, the filter membrane and stainless steel filter screen are sandwiched between the sample inlet cover and the membrane holder, with the inner and outer diameter error set to 0-0.14 mm.

4. The offline portable air pollutant sampling device according to claim 1, characterized in that, The organic pollutant collection chamber is a cylindrical body, and the length of the adsorbent inside is 70-80 mm and the diameter is 60-70 mm.

5. The offline portable air pollutant sampling device according to claim 1, characterized in that, In PM 2.5 Gaskets and raw material tape are installed at the connection between the cyclone cutting head, the particulate matter collection chamber, and the persistent organic pollutant collection chamber to enhance the sealing of the device.

6. The offline portable air pollutant sampling device according to claim 1, characterized in that, PM 2.5 The outer shells of the cyclone cutting head, particulate matter collection chamber, and persistent organic pollutant collection chamber are made of aluminum alloy, with sandblasted and oxidized surfaces and coated with Teflon.

7. The offline portable air pollutant sampling device according to any one of claims 1-6, characterized in that, During operation, the gas flow rate is controlled to allow the device to continuously sample for one hour, accumulating a gas collection volume of 1 m³. 3 .

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