| 摘要 |
<p>A drier for drying wet material includes a drying chamber with a plurality of heating region regions and a plurality of drying regions, alternatively located along the path of the material through the drier. Each of the heating regions is heated with heating fluid by a heating recirculation system wherein the heating fluid overall flows in heat exchange with the material in the chamber, but wherein the heating fluid can flow in various ways within each heating region. A fluid circulation system flows drying fluid through each of the drying regions generally in countercurrent flow relative to the flow of material through the drier, although the drying fluid can flow in various ways within each drying region. The drying fluid exiting the drier is used to preheat the heating fluid exiting the drier prior to the heating fluid reentering the drier. Makeup heat is supplied to the system.</p> |
