Method and system for determining D50 uncertainty degree of PM2.5 cutter

A measurement method and cutter technology, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve problems such as lack of research and analysis, and achieve the effects of accurate analysis and measurement, reliable technical services, and simplified analysis and calculation processes

Active Publication Date: 2017-09-22
NAT INST OF METROLOGY CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So, D 50 Uncertainty has become an important index to examine the cutting performance of PM2.5 cutters, but there is no relevant research and analysis in the prior art

Method used

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  • Method and system for determining D50 uncertainty degree of PM2.5 cutter
  • Method and system for determining D50 uncertainty degree of PM2.5 cutter
  • Method and system for determining D50 uncertainty degree of PM2.5 cutter

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Experimental program
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Effect test

Embodiment 1

[0067] see Figure 1 to Figure 3 As shown, Embodiment 1 of the present invention provides a PM2.5 cutter cutting characteristic detection device, including a gas source device 100, an atomized aerosol generator 102, a dryer 103, an electrostatic neutralizer 104, and a mixing tube 105 , aerosol particle size spectrometer 106, air pump 107, first valve 108, second valve 109, third valve 110 and fourth valve 111; the output of the gas source device 100 and the input of the atomized aerosol generator 102 Specifically, a fifth valve 119 is connected between the output end of the gas source device 100 and the input end of the atomized aerosol generator 102; The input end is connected, and the output end of drier 103 is connected with the input end of electrostatic neutralizer 104, and the output end of electrostatic neutralizer 104 is connected with the input end of mixing tube 105; The output end of mixing tube 105 is connected with The input end of the first valve 108 is connecte...

Embodiment 2

[0091] see Figure 4 As shown, Embodiment 2 of the present invention provides a detection method using the PM2.5 cutter cutting characteristic detection device described in Embodiment 1. The detection method includes the following steps:

[0092] Step 200, adding ultrapure water and standard particle suspension to the atomized aerosol generator 102 to produce monodisperse solid aerosol particles, wherein the standard particle suspension contains standard particles of various particle sizes, and more The content of standard particles with different particle sizes is a fixed value;

[0093] Specifically, in this embodiment, 8 standard particles with an aerodynamic equivalent particle size in the range of (1.5-4.0) μm in the prior art are used. The content of standard particles of each different particle size is a fixed value.

[0094] Step 201, open the first valve 108 and the third valve 110, close the second valve 109 and the fourth valve 111, read the number concentration v...

Embodiment 3

[0099] Using the above-mentioned PM2.5 cutter cutting characteristic detection device, firstly, standard particles (polystyrene particles) with different particle diameters are respectively atomized into monodisperse solid aerosols. After drying and removing static electricity, dilute and mix in the mixing tube to reach a stable state. Then, add the selected PM2.5 cutter in the gas path, and alternately measure the number of aerosol particles upstream of the PM2.5 cutter and downstream of the PM2.5 cutter by a real-time aerosol particle size spectrometer, respectively record N 1i and N 2i . Until the test of atomized monodisperse solid aerosol particles of different particle sizes is completed, N 1ij and N 2ij . Repeat the operation three times, and calculate the cutting efficiency of standard particles with different particle sizes according to the following formula:

[0100]

[0101] In the formula: i...……the particle size point of the aerosol (the number of differen...

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Abstract

The invention provides a method and system for determining D50 uncertainty degree of a PM2.5 cutter. The method for determining the D50 uncertainty degree of the PM2.5 cutter comprises the following steps: carrying out analysis and evaluation on D50 uncertainty degree in research of cutting property of the PM2.5 cutter by adopting a key section-taking fitting method; replacing a complicated cutting efficiency standard feature fitting curve with a linear curve; determining the uncertainty degree of the obtained linear curve by linear regression analysis to further determine the D50 uncertainty degree, so that an analysis and calculation process is greatly simplified, the D50 uncertainty degree in research of the cutting property of the PM2.5 cutter can be accurately analyzed and determined, the requirement on measurement traceability in a detection process of the PM2.5 cutter in China can be met, and a reliable technical service can be provided for atmosphere environment monitoring.

Description

technical field [0001] The invention relates to the technical field of air quality detection methods, in particular to a method and system for measuring the D50 uncertainty of a PM2.5 cutter. Background technique [0002] PM2.5 is particulate matter with an aerodynamic diameter less than or equal to 2.5 μm in the atmosphere, also known as particulate matter that can enter the lungs. PM2.5 has a small particle size, is rich in a large amount of toxic and harmful substances, and has a long residence time in the atmosphere and a long transportation distance, so it has a greater impact on human health and the quality of the atmospheric environment. PM2.5 particulate matter is the primary pollutant of air pollution in my country. PM2.5 monitoring and effective control is an important goal of my country's environmental protection department and the national government. At present, from national to local, from environmental protection, environmental monitoring departments, to mea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06
CPCG01N15/0205G01N15/06
Inventor 张文阁许潇
Owner NAT INST OF METROLOGY CHINA
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