A process device for coating particles in which, on the inside wall (1), there are one or more units installed. Each unit includes a swirl flow generator (4) around which a straight or curved perforated plate (3) and draft tube (5) are located in cross-section. A single or multi-phase spraying nozzle (6) is installed centrally through the swirl flow generator (4) with a conduit (7) for dispersion for coating and a conduit (8) of compressed air. The swirl flow generator (4) has at an angle from the vertical adjacent grooves (18) that open outwards, with the angle of grooves (18) to the vertical line are between 10 and 45°.