A method and device for separating particulate matter in air by grid fractionation based on particle size
A technology for fractional separation and particulate matter, which is applied in the direction of measuring devices, sampling devices, and analytical materials, etc. It can solve the problems of low measurement results, inability to solve the loss of semi-volatile substances, distortion, etc., to avoid backflow and facilitate one-time large-area processing , the effect of improving reliability
Inactive Publication Date: 2019-08-09
GUANGDONG UNIV OF TECH
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Problems solved by technology
The advantage of this technology is that the relationship is clear, the disadvantage is that the current technology cannot account for the loss of volatile and semi-volatile substances after the sample is heated, resulting in the measurement results being considered low, resulting in distortion
[0005]
In addition to the above-mentioned advantages and disadvantages of the above-mentioned 4 methods, none of them can perform accurate multi-stage sieving of particulate matter in the air according to their particle size at the same time, which affects the detection and subsequent analysis of particulate matter
Method used
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Embodiment 1
[0036] Such as figure 2 Shown, a kind of method based on particle size grid fractionation air particulate matter, comprises the following steps:
[0037] S1: open the check valve 1, pass clean air into the screening system 3 through the clean air intake pipe 2 to clean the screening system 3;
[0038] S2: drying the air to be detected;
[0039] S3: open the one-way valve 1, pass a certain amount of the air to be detected from the inlet end of the screening system 3 through the air inlet pipe 4 to be tested, and the particles of different sizes in the air to be detected are in the microcolumn 6 at different intervals was intercepted and slipped down;
[0040] S4: Stop feeding the air to be detected, and feed clean air from the inlet end of the screening system 3 to drive the gas to be detected to flow forward;
[0041] S5: collecting target particles from the outlet of the lower end of the screening system 3 through the collecting device 8 .
[0042] In step S4, the time f...
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The invention discloses a method for separating particles from air based on grid grading of particle sizes. The method for separating particles from air based on grid grading of particle sizes comprises the following steps: S1, turning on a one-way valve, introducing clean air into a sieving system through a clean air inlet pipe to clean the sieving system; S2, drying air to be detected; S3, turning on the one-way valve, introducing a certain amount of the air to be detected through an air inlet pipe for the air to be detected from the air inlet end of the sieving system, and blocking particles of different sizes in the air to be detected in front of micro columns which are arranged at different intervals in order that the particles slide off; S4, stopping introducing the air to be detected, and introducing clean air from the air inlet end of the sieving system in order to drive the air to be detected to flow forwards; S5, collecting target particles from an outlet at the lower end of the sieving system through a collecting device. The invention further discloses a device for separating the particles from the air based on grid grading of the particle sizes.
Description
technical field [0001] The invention relates to a method for screening particulate matter in the air. Specifically, the particulate matter is classified and separated according to the size of the particulate matter, so that the separation and analysis of the particulate matter are more accurate, and it is especially suitable for the aspect of grading and sampling the particulate matter in the air according to the particle size. Background technique [0002] Airborne particulate matter (Particulate Matter, PM) refers to solid or liquid particulate matter in the air. The diameter of PM ranges from 0.1um to 200um. According to the diameter of PM, PM can generally be divided into Total Suspended Particles (Total Suspended Particles, TSP), Coarse Particulate Matter (PM10) and Fine Particulate Matter (PM2.5). Total suspended particles are particles with a particle size of less than 100um; coarse particles are particles with a particle size of less than 10um. Fine particles are p...
Claims
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IPC IPC(8): G01N1/22
CPCG01N1/2202
Inventor 李志生文青梅张瑞麟
Owner GUANGDONG UNIV OF TECH