| 摘要 |
PURPOSE: To save energy by saturating a drying fluid with the steam formed in a drying stage, superheating it, passing this fluid through granular materials to dry the granular materials and repeating superheating, drying and desuperheated fluidizing by the same drying fluid having steam. CONSTITUTION: The drying fluid (air, gas or steam) is put into the column at a temp.θ0 and is saturated with the steam formed in the drying stage. The fluid is then brought into contact with intersected pipes 14, by which the drying fluid is superheated to a temp. higher than the temp.θ0 and is heated to a temp.θ2>θ0. Next, the drying fluid is passed through a porous grille 1 and the granular materials to be dried to fluidize and dry the granular materials. The superheating, drying and desuperheated fluidizing are repeated 4 to >=40 times by the same drying fluid gradually having the steam. The granular products are ejected at a temp.θ1 by back flow and are recirculated under the first intersected pipes 14 at the temp.θ0. At this time, the temp.θ1 is slightly lower than the temp.θ0. Consequently, energy is saved and the drying of the granular products is made possible. |
