Nano aerosol enrichment device and method based on water vapor supersaturation growth technology

Abstract

The invention discloses a nano aerosol enrichment device and method based on a water vapor supersaturation growth technology. The invention relates to a nano aerosol growth enrichment device and method based on a water vapor supersaturation condensation principle. The device comprises a condensation increasing pipe, an ultrapure water channel, an aerodynamic enrichment module and a temperature control device. Based on a water vapor supersaturation condensation principle, a three-stage temperature control device is used for controlling the supersaturation condensation growth temperature, and when an aerosol sample passes through a supersaturation condensation growth pipe, firstly, a water vapor supersaturation condition is provided for particle condensation growth by utilizing the characteristic that the water vapor diffusion rate is higher than the gas heat transfer rate; and then through temperature gradient setting with opposite trends, the growth chamber is cooled and the supersaturation condition is maintained at the same time, so that the condensation growth of the aerosol is realized. The aerosol with the increased particle size passes through the aerodynamic enrichment module, and enrichment of the number concentration of the aerosol is achieved.

Description

technical field [0001] The invention relates to the technical field of aerosol monitoring, in particular to a nano-aerosol enrichment device and a control method based on the principle of water vapor supersaturated condensation. Background technique [0002] At present, the main measurement method for ultrafine nano-aerosols (<100 nanometers) is to make the nano-aerosols condense and grow to the particle size range that can be detected by optical detectors under supersaturated conditions, and detect the number concentration by optical detectors. . [0003] At present, my country's nano-aerosol supersaturated condensation growth device based on water vapor is mainly a two-stage temperature-controlled condensation growth device. The patent publication number of CN106680057B provides a two-stage supersaturated condensation growth device for nano-aerosol based on water vapor. , the device has the following disadvantages: 1) the temperature of the airflow after supersaturated ...

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Problems solved by technology

[0003] At present, my country's nano-aerosol supersaturated condensation growth device based on water vapor is mainly a two-stage temperature-controlled condensation growth device. The patent publication number of CN106680057B provides a two-stage supersaturated condensation growth device for nano-aerosol based on water vapor. , the device has the following disadvantages: 1) the temperature of the airflow after supersaturated condensation growth is too high, which is not conducive to mass spectrometry detection; low signal strength

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