HEATING, DRYING AND COOLING OF POWDERED MATERIAL

PURPOSE:To improve heating and cooling effects by a method wherein in case the powdered material is indirectly heated, dried and cooled from outside of a transfer pipe for transferring the powdered material by means of a swirling stream of air, the powdered material is fluidized by the swirling stream of air. CONSTITUTION:An upstream side inlet port 1a is formed at one end of the transfer pipe 1 in such a manner that the inlet port 1a is displaced from the center axis of the pipe 1 and in the tangential direction with respect to the sectional surface of the pipe 1. Further, a heat medium passage 3 is formed about the outer periphery of the pipe 1 in coaxial relationship with the pipe 1 and a transferring gas and the powdered material entering the pipe 1 flow toward an outlet port 1b along the inner wall surface of the pipe as shown by the arrow A since the inlet port 1a is displaced from the center axis of the pipe 1. Accordingly, the powdered material is thrusted against the inner wall of the pipe 1 due to a centrifugal force so that it exchanges heat effectively with the heating fluid 3 and breaks and reduces a gas film formed on the inner wall surface of the pipe 1.