Method for the selective purification of aerosols

Patent metadata

Field	Value
Publication number	US-2018200728-A1
Application number	US-201615744362-A
Country	US
Kind code	A1
Filing date	Jul 28, 2016
Priority date	Jul 28, 2015
Publication date	Jul 19, 2018
Grant date	—

Abstract

The invention relates to a method for the selective purification of aerosols. The invention consists in electrostatically collecting all of the particles present in an aerosol, but with separation of the mechanisms on one hand for charging particles by unipolar ion diffusion in order to charge and then collect the finest particles, and on the other hand for charging particles by means of Corona discharge in order to charge and then collect the largest particles on a substrate different from the substrate for collecting the finest particles.

First claim

1 . A method for selectively purifying an aerosol comprising the following steps:
sucking the aerosol through a, preferably cylindrical conduit from its inlet orifice; charging the finest particles, downstream of the inlet orifice, by unipolar ion diffusion in a space between an electrode in the form of a gate surrounding an electrode in the form of a wire, and a first conductive portion of the internal wall of the conduit; generating an electric field without a corona effect in the space between an electrode and a second conductive portion of the internal wall of the conduit, in order to collect the finest particles charged by the diffusion charger by deposition onto a first collection substrate (Zn); generating an electric field with a corona effect in the space between the wire or the point of an electrode and a third conductive portion of the internal wall of the conduit, in order to collect the biggest particles not charged by the diffusion charger by deposition onto a second collection substrate (Zm) distinct from the first collection substrate; extracting purified air from the outlet orifice of the conduit.

2 . The purification method as claimed in claim 1 , further comprising at least one step of recycling or reusing the finest particles collected on the first substrate and/or the biggest particles collected on the second substrate.

3 . The purification method as claimed in claim 1 , further comprising the following steps:
a/ collecting radioactive particles on the first and/or the second collection substrate during a time period t 1 ; b/ counting pulses generated by the ionization current of the air in the spaces during a time period t 2 .

Assignees

• Commissariat Energie Atomique

Inventors

• Pourprix Michel
• Brouard Christophe
• Clavaguera Simon

Classifications

• B03C3/368

  by other than static mechanical means, e.g. internal ventilator or recycler · CPC title

• G01N15/0266

  with electrical classification · CPC title

• G01N2015/0046

  in gas, e.g. smoke · CPC title

• B03C3/49

  tubular · CPC title

• B03C3/12

  characterised by separation of ionising and collecting stations · CPC title