Particle-removal apparatus

Claim 1

A uniflow cyclone for the removal of particles from a gas stream entraining same, said uniflow cyclone comprising: a duct having an upstream end receiving said gas stream and a downstream end; swirl-inducing means in said duct between said ends for imparting rotary movement to the gas stream as it traverses said duct, said swirl-inducing means comprising a body disposed centranlly in said duct and a plurality of angularly spaced vanes disposed around said body and pitched to deflect said stream angularly, at least some of said vanes having trailing edges formed with longitudinally extending collecting channels which have slits open to the gas stream; a plurality of elongated outlet slots formed in the duct downstream of said swirl-inducing means; and a housing surrounding said duct and defining a collecting chamber communicating with the interior of said duct through said slots, said channels communicating through the wall of said duct with said chamber through respective openings, said slots being inclined and being oriented so as to be substantially transverse to the rotary movement of said gas stream, said duct at said downstream end being formed with an outwardly divergent collar over which a portion of the gas stream is deflected into said chamber, the openings of said channels through the wall of said duct into said chamber and said slots being so dimensioned that a portion of the gas stream which has passed said slots is drawn over the collar into said chamber.