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Drying of granulated materials. Part II. Drying of granules in rotary driers

โœ Scribed by Van Krevelen, D. W. ;Hofitjzer, P. J.

Publisher
Wiley (John Wiley & Sons)
Year
1949
Weight
687 KB
Volume
68
Category
Article
ISSN
0368-4075

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โœฆ Synopsis

Abstract

The product of residence time (t), number of revolutions of the dryer per unit of time (n), ratio of diameter to length of the dryer.

(d/l) and the tangent of the angle of inclination (tan ฮฑ) appears to be constant for every dryer; given by: tnd tan ฮฑ/l.

The constant c depends on the construction of the dryer and is nearly inversely proportional to the number of steps into which die diameter of the dryer is divided by the lifter construction. The drying rate of granules which contain no soluble salts in a rotary dryer is smaller than in freely suspended state at the same Reynolds number of flow.

The ratio qudrying rate in a torary dryer/drying rate of freely suspended granules increases.

With the number of revolutions. n. Approximately. q = 1/4 to 1/5 when n = 10 r.p.m. and q โˆผ n^0.5^. The experiments do nit allow quantitative conclusions to be drawn on the rate of drying in the second period. The rate of drying of nitrochalk granules in a rotary dryer proved to be the same as for freely suspended granules at the same temperature.

๐Ÿ“œ SIMILAR VOLUMES

Drying of granulated materials. Part I.
Drying of granulated materials. Part I. Drying of a single granule
โœ Van Krevelen, D. W. ;Hoftijzer, P. J. ๐Ÿ“‚ Article ๐Ÿ“… 1949 ๐Ÿ› Wiley (John Wiley & Sons) โš– 770 KB

## Abstract Granules of wet marl, suspended from the beam of a torsion balance, were dried in a current of dry air. Two rate periods were observed; during the first the rate of drying remains constant, during the second it decreases. With the aid of the conception of Ceaglske and Hougen on moisture