FIELD: separation of solid particles from gas flow. SUBSTANCE: two concentrators of dust particles made integral with each other are located along the single axis of symmetry in a linear duct in such a manner that the first of them has a dust flue unit, and the other, terminating in cantilever in the last link of the conical system with the minimum outlet section, is installed before the inlet of the first one forming an abrupt variation of sections of the adjacent pairs of rings or plates the two concentrators; the end part of the second inlet concentrator may be pushed in the conical cavity of the first one. EFFECT: enhanced efficiency. 6 cl, 4 dwg
