Patent ID: 6185842
Filing Date: 2001-02-13
Classification: E01C,F26B

Abstract:
Apparatus for mixing, heating and drying solid particles comprising:a drum mounted for rotation about an axis and having an inlet for supplying particles into the drum and an outlet for discharging the mixed, heated and dried particles from the drum;means for supplying hot gases of combustion for flow in a generally axial direction along the interior of the drum to heat the particles in the drum;an exhaust outlet for the hot gases within the drum;flighting extending longitudinally within said drum between said inlet and outlet for creating a veil of particles across the interior and along a longitudinally extending region of said drum in response to rotation of the drum about said axis and through which veil the hot gases of combustion flow in heat transfer relation with the particles; andlongitudinally extending means within said drum and in said region for intercepting at least a longitudinal extent of the veil of particles within the drum to define a longitudinally extending channel substantially free of veiling particles such that a portion of the hot gases flowing along the drum bypasses the particle veil and passes through said channel.