Patent ID: 6360975
Filing Date: 2002-03-26
Classification: B01D,B02C,F23J,F23K

Abstract:
A system for comminuting solid particles comprising:a single chamber; means for feeding said solid particles into said chamber; an outside source of pressurized gas, gas from said pressurized source being fed into the bottom end of said chamber; stationary means mounted in said chamber near the bottom end thereof for providing uplifting pressure for driving said gas and said particles upwardly in an annulus along the inner wall of the chamber facilitating the creation thereby of a toroidal fluid bed of particles; at least one rotor having blades rotatably mounted in said chamber, said rotor generating a centrifugal driving force in the gas between the ends of the rotor blade and the inner wall of the chamber which is partitioned by baffles affixed to said wall for comminuting the particles as they are driven upwardly; at least two semi permeable screens rotatably mounted in said chamber above said rotor; a shaft, said screens and rotor being mounted on said shaft; said particles being driven from said rotor against said screens with the smaller particles passing therethrough and the larger particles being driven back to the rotor for further comminution, said screens generating vertical spiral gas vortices which further comminute the particles and horizontal cyclones which centrifugally sort the passing high speed particles and recycle them down for further communition in the upwardly moving gas stream; means for expelling the comminuted particles from said chamber; and motor means for rotatably driving said shaft.