| 摘要 |
<p>Drying air which crosses supporting screen (E) for the material is given a whirling movement up to entrain dust particles with a helical ascending spiral trend, along the walls of drying chamber B overlying said screen, thereby lengthening the contact time of the material granules with the air. After the dried material has reached the top of chamber (B), it re-descends along the axis of said chamber (B) and may be removed and selected by suction and collecting means (24-28), the position of which is adjustable in height. <IMAGE></p> |
