The removal of fine particles from gases can be considerably
simplified if the particles are first enlarged into greater ones by a
preconditioning technique. Such preconditioning can be the heterogeneous
condensation of water vapor with the fine particles acting
as nucleation centres [1,7], for which a supersaturated water
vapor environment is required. When the degree of supersaturation
exceeds a critical value Scr, the particles can be activated and
grow into larger droplets that can be efficiently removed by conventional
separators.