Method and apparatus for drying thermosensitive materials

摘要

PCT No. PCT/SU87/00025 Sec. 371 Date Oct. 24, 1988 Sec. 102(e) Date Oct. 24, 1988 PCT Filed Feb. 24, 1987 PCT Pub. No. WO88/06409 PCT Pub. Date Sep. 7, 1988.A method of drying thermosensitive materials includes spraying such materials onto inert bodies circulating about a closed space in a flow of a heat-transfer agent at an increased temperature. In the upper part of the flow of the heat-transfer agent, occupying not more than 1/3 of its cross section, the heat transfer agent is rotated at an axial velocity 2 to 3 times higher than the velocity of the heat transfer agent in the rest of the flow. An apparatus for carrying out this method has a cylindrical chamber with a tapered bottom accommodating axially of the chamber a blind tube with a base defining with the walls of the bottom an annular passage for introducing a heat transfer agent thereto. The chamber has a mesh and a propeller mixer secured thereunder on a shaft arranged at an angle of 60 DEG -90 DEG to the axis of the chamber at a distance from this axis which is less than R, where R is the radius of the chamber.