Drying of porous granular materials

✍ Scribed by Anders Hallström; Roland Wimmerstedt

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 635 KB
• Volume: 38
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(83)80086-4

✦ Synopsis

Drying characteristics have been measured for two types of granular compound fertilizer and for granular mono calcium phosphate. Au was forced through a fixed bed, and the humidity of the air leaving the bed was analysed by means of an infrared photometer.

All results confirm the assumption of vapour diffusion as the rate determining mechanism. Experiments with varying temperature and air humidity show that the dependence of the drying rate on those parameters may be calculated from the sorption isotherms. These were measured for all three materials. Experiments also show that the drying rate is inversely proportional to the granule radius squared.

A shrinking core model was successfully used for predicting the drying behaviour of two of the materials. FOI the third material the drying rate fell rapidly, and the shrinking core model was used with a correction function lNTROOtlCTlON