Patent ID: 6827761
Filing Date: 2004-12-07
Classification: B01D,G01N

Abstract:
A particle concentrator for concentrating particles carried by a carrier gas comprising, in sequence, a diffuser section having an inlet and an outlet end;a charging section including electrical charging means for charging particles passing therethrough; focussing section having a central axis and including electrical focussing means for focussing electrically charged particles passing therethrough towards said central axis; a convergent section having a large end connected to said focussing section and a smaller end; and a virtual impact particle concentrator connected to said smaller end, said virtual impact particle concentrator comprising a nozzle, a major discharge passage extending laterally immediately after said nozzle for discharging carrier gas generally depleted of particles and a minor discharge passage extending axially after said nozzle for discharging an enriched particle stream, said minor discharge passage of a dimension larger than said nozzle.