Aerosol different-particle-size sample injection system

Abstract

The invention relates to an aerosol particle size division sampling system which comprises a multi-channel gas inlet switching unit, a first-stage cutting unit, a drying unit, a flow supplementing unit, a second-stage multi-channel switching unit, a second-stage cutting unit and a computer control module, the multi-channel air inlet switching unit is connected with the first-stage cutting unit, the multi-channel air inlet switching unit is connected with the flow supplementing unit, and the multi-channel air inlet switching unit is connected with the drying unit; the drying unit is connected with the secondary multi-channel switching unit; the second-stage multi-channel switching unit is connected with the second-stage cutting unit and is used for cutting the dried sampling gas in different modes; the multi-channel air inlet switching unit, the flow supplementing unit and the second-stage multi-channel switching unit are all electrically connected with the computer control module. According to the invention, the consistency of the cutting particle size of particles in a dry state is ensured, so that the mass concentration and chemical components of aerosol particles are accurately measured; the invention belongs to the technical field of environment monitoring.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to an aerosol particle size sampling system. Background technique [0002] PM 1 and PM 2.5 Accurate measurement of mass concentration and chemical composition is an important prerequisite for accurate assessment of particulate pollution status, physical and chemical properties of aerosol particles, radiative forcing, climate and environmental effects research, and forecast assessments such as air quality models and climate models. But new research shows that existing PMs 1 and PM 2.5 Mass concentration and chemical composition observations can be significantly affected by aerosol hygroscopic growth, especially in regions of high relative humidity. This is because the measurement of ambient aerosol particles mostly requires drying the ambient atmosphere before performing subsequent measurements, so that the physical and chemical characteristics of the aerosol in ...

AI Technical Summary

Problems solved by technology

This shows that the growth of aerosol moisture absorption in different regions has a great influence on PM 1 and PM 2.5 measurements may have significantly different effects

This makes the "upper limit" of the particle size of aerosol particle sampling in the dry state change with the seasonal and regional changes of the RH in the existing particle cutting sampling method, which affects the maximum value that can be collected by the back-end observation instrument. Particle size range, which in turn affects the accuracy of PM mass concentration and chemical composition measurement and the uniformity of cutting particle size across the country

[0004] In short, although the existing aerosol cutting sampling measurement method ensures the uniformity of the particle mass concentration in different regions compared in the dry state, it cannot guarantee the consistency of the particle size in the dry state, which may cause systematic deviation. The annual, seasonal, and diurnal changes of the aerosol particle mass concentration and chemical composition in the dry state cannot be compared under the same standard, and the measurement accuracy of the aerosol particle mass concentration and chemical composition is poor

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