Condensation nucleus particle counter for deducing chemical components of particulate matters

Abstract

The invention discloses a condensation nucleus particle counter for deducing chemical components of particulate matters. The condensation nucleus particle counter comprises a sheath gas structure, a saturation chamber, a growth chamber, a flow sensor, an optical counter, a pulse signal analyzer, a mass flow controller and the like, wherein all the components are sequentially connected to form a sample gas path and a gas supplementing path; the optical counter is used for counting particulate matters and collecting signal pulse heights; the pulse signal analyzer is used for analyzing the pulse signals collected by the optical counter; the mass flow controller is used for adjusting sample gas and gas supplementing flow, and the sample gas flow is changed under the condition that the gas inlet flow is stable, so that rapid switching of the supersaturation degree of working liquid in the growth chamber can be realized, and according to the relationship between the moisture absorption parameters of the particulate matters and the mass fractions of the organic matters, the moisture absorption of the particulate matters with different particle sizes is measured by rapidly changing the supersaturation degree, and the proportion of the organic matters in the particulate matters can be obtained; meanwhile, since the pulse signal heights of the particulate matters with the same particle size and different chemical components in the optical counter are different, the chemical components of the particulate matters can be deduced after instrument calibration.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and relates to a condensation nuclei particle counter for inferring the chemical composition of particles. Specifically, it is a method that uses temperature difference to generate supersaturated working fluid vapor, and can quickly change the supersaturation degree in the growth chamber by changing the sample gas flow rate, and then condenses the supersaturated vapor on the surface of the particle to make the nanoscale particle grow to a micron Level, and then use the optical detector to count the measuring instrument of the particles. Background technique [0002] In recent years, my country has paid great attention to the problem of smog pollution, and in 2012 the PM 2.5 Included in the ambient air quality standard. PM 2.5 It is defined as particles with an aerodynamic equivalent diameter less than or equal to 2.5 microns, which have the characteristics of long suspension t...

AI Technical Summary

Problems solved by technology

Although these invention patents all have the function of particle counting, they are limited to the measurement of the number concentration of particles, and do not involve the change of supersaturation and the measurement of chemical components.

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