A flow reaction device for the formation and growth of new particles in atmospheric aerosols

Abstract

The invention discloses a flowing reaction device allowing forming and growing of new particles of atmospheric aerosol. The length of the flowing reaction device is about 22 meters. The flowing reaction device comprises four parts of a sample injection region (I), a transition region (II), a nucleation region (III) and a growing region (IV), wherein the sample injection region comprises three sample inlets and a set of water bath heating water inlets and outlets; the transition region comprises a temperature humidity detecting opening, a low-volatility substance sample inlet and a primary sampling opening; the nucleation region comprises a set of water inlets and outlets for controlling temperature of water bath, a plurality of intermediate sampling openings and a temperature humidity detecting opening formed in the upper part of the nucleation region; the growing region comprises a plurality of growing region sampling openings; the change of the particle number concentration and the change of the particle diameter of each sampling opening are detected through scanning an electrical mobility particle diameter spectrometer. The flowing reaction device disclosed by the invention can be used for researching the generative mechanism and the rising characteristic of the new particles in the atmosphere, so that the dynamics of the nucleation of the aerosol is further researched, and the flowing reaction device has the characteristics of being high in precision, good in stability, simple and convenient to operate, and the like.

Description

technical field [0001] The invention relates to a flow reaction device for the formation and growth of atmospheric aerosol new particles and belongs to the field of atmospheric environment aerosol research. Background technique [0002] With the development of society, human beings are facing increasingly severe environmental problems, and haze is one of them. Research shows that the main cause of China's regional haze problem is PM 2.5 , while PM 2.5 It mainly comes from primary emission and the formation of new particles, among which the generation of new particles has a potentially important contribution to the number concentration of aerosol particles, indirect radiation effects, and cloud condensation nuclei. These nascent secondary particles originate from low-volatility gas-phase species in the atmosphere. Supersaturated gaseous precursors (such as sulfuric acid and low-volatility organic compounds) generated by the oxidation of gaseous pollutants condense into mole...

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Problems solved by technology

The dynamic flow tube simulation is mainly used for the study of the formation of new particles, but the current known flow tube research generally has the problem of too short response time, which is only suitable for the study of the formation of new particles in the initial state. For the study of subsequent growth problems It also has certain limitations. It is impossible to explore the nucleation model applicable to our country under the existing conditions, and it is impossible to conduct further systematic research on aerosol dynamics.

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