SOLID-GAS CONTACT METHOD BY PARTICLE INTERNAL CIRCULATION

PURPOSE:To simplify the operation of an apparatus by supplying solid particles in the concn. necessary for the motion thereof as a particle bed or lump with the conversion of the direction of an air stream in the upper part of a tower. CONSTITUTION:In a solid-gas contact method due to particle internal circulation wherein solid particles 10 are dispersed in the air stream rising in a tower 1 to be brought into contact with the air stream and solid-gas separation is carried out by the conversion of the direction of the air stream in the upper part of the tower 1, at first, the air stream in the tower 1 is raised at speed higher than the sedimentation speed of the solid particles 10. The solid particles 10 are supplied in the concn. necessary for the motion thereof as a particle bed 11 or particle lumps 12 with the conversion of the direction of the air stream in the upper part of the tower 1. By allowing the solid particles to fall through the rising air stream in the tower 1 at the upper part of the tower 1 becoming the particle bed 11 or particle lumps 12, the rising solid particles 10 are returned to the lower part of the tower 1 to be circulated within the tower 1.