| 摘要 |
The present invention relates to the vacuum drying of capillary porous bulk materials. The method involves preheating of the material, its loading into the vacuum drying chamber having heating elements followed by cycle-by-cycling heating of the material and vacuum creation in the rapid vacuum impulse action mode with stage-by-stage single or multiple reduction of pressure in the range from 0.1 MPa to 0.0001 MPa followed by the exposure to vacuum unless the material temperature is stabilized. Said cycles axe repeated unless the required material moisture is achieved. Cooling of the material is performed in the same drying chamber by alternating cooling in spouted bed and vacuum impulse action. The device comprises two vacuum chambers cone-shaped at their bases with heaters mounted inside them, material loading/unloading system, one or several receivers with pumps connected in parallel to them and connected via vacuum pipeline system with quick-acting valves to the drying chamber inlet.
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