Two-stage refrigeration particulate matter condensation growth counter

Abstract

The invention belongs to the technical field of environment monitoring. The invention relates to a counter, in particular to a two-stage refrigeration particulate matter condensation growth counter. The device comprises an inlet, an evaporation chamber, a steam cooling heat insulator, a condensation chamber section I, a condensation heat insulator, a condensation chamber section II, a nozzle and alight scattering counter which are connected in sequence, an outlet of the light scattering counter is connected with a flow limiting hole through a hose, the flow limiting hole is connected with a three-way connector A through a hose, and a three-way connector B is connected with an air pump through a hose; the pressure measuring device is respectively connected with the three-way connector C, the evaporation chamber and the condensation chamber through hoses; and the temperature measuring device is respectively connected with the evaporation chamber, the condensation chamber I section and the condensation chamber II section through circuits. According to the invention, the flow of particulate matters can be increased, so that the number of the particulate matters passing through the optical detector is increased, the activation area of the particulate matters is enlarged, the detection efficiency of an instrument on small particulate matters is improved, the original series structure of two different working solutions is changed into an independent CPC, and the single-stage detection of 1-3 nano particulate matters is realized.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and in particular relates to a two-stage refrigeration particle condensation growth counter. Background technique [0002] The number concentration data of 1-3nm particulate matter is an important basis for studying the formation of secondary particulate matter in the atmosphere. In order to study the generation of new particles and their nucleation mechanism, it is necessary to observe and study the physical and chemical characteristics of the newly generated particles. The critical cluster particle size related to nucleation is usually between 1-3 nanometers, so this particle size range is a key scale for studying the generation of new particles. Studies have shown that the occurrence of new particle events can be judged by changes in the particle size distribution of atmospheric particles, especially the change in the number of 1-3 nanometer particles. In addition, in the pr...

AI Technical Summary

Problems solved by technology

[0007] (3) Since the existing optical detectors cannot directly detect the droplets after condensation and growth in diethylene glycol, it is necessary to use n-butanol working fluid for secondary condensation growth after primary condensation growth, requiring two The use of CPC in series increases the complexity and cost of the instrument

Images